1145256Sjkoshy/*- 2183266Sjkoshy * Copyright (c) 2003-2008 Joseph Koshy 3174395Sjkoshy * Copyright (c) 2007 The FreeBSD Foundation 4145256Sjkoshy * All rights reserved. 5145256Sjkoshy * 6174395Sjkoshy * Portions of this software were developed by A. Joseph Koshy under 7174395Sjkoshy * sponsorship from the FreeBSD Foundation and Google, Inc. 8174395Sjkoshy * 9145256Sjkoshy * Redistribution and use in source and binary forms, with or without 10145256Sjkoshy * modification, are permitted provided that the following conditions 11145256Sjkoshy * are met: 12145256Sjkoshy * 1. Redistributions of source code must retain the above copyright 13145256Sjkoshy * notice, this list of conditions and the following disclaimer. 14145256Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 15145256Sjkoshy * notice, this list of conditions and the following disclaimer in the 16145256Sjkoshy * documentation and/or other materials provided with the distribution. 17145256Sjkoshy * 18145256Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19145256Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20145256Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21145256Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22145256Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23145256Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24145256Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25145256Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26145256Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27145256Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28145256Sjkoshy * SUCH DAMAGE. 29145256Sjkoshy * 30145256Sjkoshy */ 31145256Sjkoshy 32145256Sjkoshy#include <sys/cdefs.h> 33145256Sjkoshy__FBSDID("$FreeBSD: stable/11/sys/dev/hwpmc/hwpmc_mod.c 343350 2019-01-23 17:36:58Z markj $"); 34145256Sjkoshy 35145256Sjkoshy#include <sys/param.h> 36145256Sjkoshy#include <sys/eventhandler.h> 37145256Sjkoshy#include <sys/jail.h> 38145256Sjkoshy#include <sys/kernel.h> 39147191Sjkoshy#include <sys/kthread.h> 40145256Sjkoshy#include <sys/limits.h> 41145256Sjkoshy#include <sys/lock.h> 42145256Sjkoshy#include <sys/malloc.h> 43145256Sjkoshy#include <sys/module.h> 44201151Sjkoshy#include <sys/mount.h> 45145256Sjkoshy#include <sys/mutex.h> 46145256Sjkoshy#include <sys/pmc.h> 47145256Sjkoshy#include <sys/pmckern.h> 48147191Sjkoshy#include <sys/pmclog.h> 49164033Srwatson#include <sys/priv.h> 50145256Sjkoshy#include <sys/proc.h> 51145256Sjkoshy#include <sys/queue.h> 52147191Sjkoshy#include <sys/resourcevar.h> 53248084Sattilio#include <sys/rwlock.h> 54145256Sjkoshy#include <sys/sched.h> 55145256Sjkoshy#include <sys/signalvar.h> 56145256Sjkoshy#include <sys/smp.h> 57145256Sjkoshy#include <sys/sx.h> 58145256Sjkoshy#include <sys/sysctl.h> 59145256Sjkoshy#include <sys/sysent.h> 60145256Sjkoshy#include <sys/systm.h> 61147191Sjkoshy#include <sys/vnode.h> 62145256Sjkoshy 63157144Sjkoshy#include <sys/linker.h> /* needs to be after <sys/malloc.h> */ 64157144Sjkoshy 65147191Sjkoshy#include <machine/atomic.h> 66145256Sjkoshy#include <machine/md_var.h> 67145256Sjkoshy 68201021Sjkoshy#include <vm/vm.h> 69201021Sjkoshy#include <vm/vm_extern.h> 70201021Sjkoshy#include <vm/pmap.h> 71201021Sjkoshy#include <vm/vm_map.h> 72201021Sjkoshy#include <vm/vm_object.h> 73201021Sjkoshy 74233628Sfabient#include "hwpmc_soft.h" 75233628Sfabient 76145256Sjkoshy/* 77145256Sjkoshy * Types 78145256Sjkoshy */ 79145256Sjkoshy 80145256Sjkoshyenum pmc_flags { 81145256Sjkoshy PMC_FLAG_NONE = 0x00, /* do nothing */ 82145256Sjkoshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 83145256Sjkoshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 84145256Sjkoshy}; 85145256Sjkoshy 86145256Sjkoshy/* 87145256Sjkoshy * The offset in sysent where the syscall is allocated. 88145256Sjkoshy */ 89145256Sjkoshy 90145256Sjkoshystatic int pmc_syscall_num = NO_SYSCALL; 91145256Sjkoshystruct pmc_cpu **pmc_pcpu; /* per-cpu state */ 92145256Sjkoshypmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 93145256Sjkoshy 94145256Sjkoshy#define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 95145256Sjkoshy 96145256Sjkoshystruct mtx_pool *pmc_mtxpool; 97145256Sjkoshystatic int *pmc_pmcdisp; /* PMC row dispositions */ 98145256Sjkoshy 99145256Sjkoshy#define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 100145256Sjkoshy#define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 101145256Sjkoshy#define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 102145256Sjkoshy 103145256Sjkoshy#define PMC_MARK_ROW_FREE(R) do { \ 104145256Sjkoshy pmc_pmcdisp[(R)] = 0; \ 105145256Sjkoshy} while (0) 106145256Sjkoshy 107145256Sjkoshy#define PMC_MARK_ROW_STANDALONE(R) do { \ 108145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 109145256Sjkoshy __LINE__)); \ 110145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 111183266Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= (-pmc_cpu_max_active()), \ 112183266Sjkoshy ("[pmc,%d] row disposition error", __LINE__)); \ 113145256Sjkoshy} while (0) 114145256Sjkoshy 115145256Sjkoshy#define PMC_UNMARK_ROW_STANDALONE(R) do { \ 116145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 117145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 118145256Sjkoshy __LINE__)); \ 119145256Sjkoshy} while (0) 120145256Sjkoshy 121145256Sjkoshy#define PMC_MARK_ROW_THREAD(R) do { \ 122145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 123145256Sjkoshy __LINE__)); \ 124145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 125145256Sjkoshy} while (0) 126145256Sjkoshy 127145256Sjkoshy#define PMC_UNMARK_ROW_THREAD(R) do { \ 128145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 129145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 130145256Sjkoshy __LINE__)); \ 131145256Sjkoshy} while (0) 132145256Sjkoshy 133145256Sjkoshy 134145256Sjkoshy/* various event handlers */ 135254813Smarkjstatic eventhandler_tag pmc_exit_tag, pmc_fork_tag, pmc_kld_load_tag, 136254813Smarkj pmc_kld_unload_tag; 137145256Sjkoshy 138145256Sjkoshy/* Module statistics */ 139145256Sjkoshystruct pmc_op_getdriverstats pmc_stats; 140145256Sjkoshy 141145256Sjkoshy/* Machine/processor dependent operations */ 142185363Sjkoshystatic struct pmc_mdep *md; 143145256Sjkoshy 144145256Sjkoshy/* 145145256Sjkoshy * Hash tables mapping owner processes and target threads to PMCs. 146145256Sjkoshy */ 147145256Sjkoshy 148145256Sjkoshystruct mtx pmc_processhash_mtx; /* spin mutex */ 149145256Sjkoshystatic u_long pmc_processhashmask; 150145256Sjkoshystatic LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 151145256Sjkoshy 152145256Sjkoshy/* 153145256Sjkoshy * Hash table of PMC owner descriptors. This table is protected by 154145256Sjkoshy * the shared PMC "sx" lock. 155145256Sjkoshy */ 156145256Sjkoshy 157145256Sjkoshystatic u_long pmc_ownerhashmask; 158145256Sjkoshystatic LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 159145256Sjkoshy 160145256Sjkoshy/* 161147191Sjkoshy * List of PMC owners with system-wide sampling PMCs. 162147191Sjkoshy */ 163147191Sjkoshy 164147191Sjkoshystatic LIST_HEAD(, pmc_owner) pmc_ss_owners; 165147191Sjkoshy 166147191Sjkoshy 167147191Sjkoshy/* 168184802Sjkoshy * A map of row indices to classdep structures. 169184802Sjkoshy */ 170184802Sjkoshystatic struct pmc_classdep **pmc_rowindex_to_classdep; 171184802Sjkoshy 172184802Sjkoshy/* 173145256Sjkoshy * Prototypes 174145256Sjkoshy */ 175145256Sjkoshy 176282641Sjhb#ifdef HWPMC_DEBUG 177145256Sjkoshystatic int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 178145256Sjkoshystatic int pmc_debugflags_parse(char *newstr, char *fence); 179145256Sjkoshy#endif 180145256Sjkoshy 181145256Sjkoshystatic int load(struct module *module, int cmd, void *arg); 182147191Sjkoshystatic int pmc_attach_process(struct proc *p, struct pmc *pm); 183145256Sjkoshystatic struct pmc *pmc_allocate_pmc_descriptor(void); 184147191Sjkoshystatic struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 185147191Sjkoshystatic int pmc_attach_one_process(struct proc *p, struct pmc *pm); 186147191Sjkoshystatic int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 187147191Sjkoshy int cpu); 188147191Sjkoshystatic int pmc_can_attach(struct pmc *pm, struct proc *p); 189233628Sfabientstatic void pmc_capture_user_callchain(int cpu, int soft, struct trapframe *tf); 190147191Sjkoshystatic void pmc_cleanup(void); 191147191Sjkoshystatic int pmc_detach_process(struct proc *p, struct pmc *pm); 192147191Sjkoshystatic int pmc_detach_one_process(struct proc *p, struct pmc *pm, 193147191Sjkoshy int flags); 194147191Sjkoshystatic void pmc_destroy_owner_descriptor(struct pmc_owner *po); 195273236Smarkjstatic void pmc_destroy_pmc_descriptor(struct pmc *pm); 196147191Sjkoshystatic struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 197147191Sjkoshystatic int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 198145256Sjkoshystatic struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 199145256Sjkoshy pmc_id_t pmc); 200145256Sjkoshystatic struct pmc_process *pmc_find_process_descriptor(struct proc *p, 201145256Sjkoshy uint32_t mode); 202145774Sjkoshystatic void pmc_force_context_switch(void); 203145256Sjkoshystatic void pmc_link_target_process(struct pmc *pm, 204145256Sjkoshy struct pmc_process *pp); 205174395Sjkoshystatic void pmc_log_all_process_mappings(struct pmc_owner *po); 206174395Sjkoshystatic void pmc_log_kernel_mappings(struct pmc *pm); 207174395Sjkoshystatic void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p); 208147191Sjkoshystatic void pmc_maybe_remove_owner(struct pmc_owner *po); 209147191Sjkoshystatic void pmc_process_csw_in(struct thread *td); 210147191Sjkoshystatic void pmc_process_csw_out(struct thread *td); 211145256Sjkoshystatic void pmc_process_exit(void *arg, struct proc *p); 212145256Sjkoshystatic void pmc_process_fork(void *arg, struct proc *p1, 213145256Sjkoshy struct proc *p2, int n); 214233628Sfabientstatic void pmc_process_samples(int cpu, int soft); 215147191Sjkoshystatic void pmc_release_pmc_descriptor(struct pmc *pmc); 216147191Sjkoshystatic void pmc_remove_owner(struct pmc_owner *po); 217147191Sjkoshystatic void pmc_remove_process_descriptor(struct pmc_process *pp); 218147191Sjkoshystatic void pmc_restore_cpu_binding(struct pmc_binding *pb); 219147191Sjkoshystatic void pmc_save_cpu_binding(struct pmc_binding *pb); 220147191Sjkoshystatic void pmc_select_cpu(int cpu); 221145256Sjkoshystatic int pmc_start(struct pmc *pm); 222145256Sjkoshystatic int pmc_stop(struct pmc *pm); 223147191Sjkoshystatic int pmc_syscall_handler(struct thread *td, void *syscall_args); 224147191Sjkoshystatic void pmc_unlink_target_process(struct pmc *pmc, 225147191Sjkoshy struct pmc_process *pp); 226233628Sfabientstatic int generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp); 227233628Sfabientstatic int generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp); 228233628Sfabientstatic struct pmc_mdep *pmc_generic_cpu_initialize(void); 229233628Sfabientstatic void pmc_generic_cpu_finalize(struct pmc_mdep *md); 230145256Sjkoshy 231145256Sjkoshy/* 232145256Sjkoshy * Kernel tunables and sysctl(8) interface. 233145256Sjkoshy */ 234145256Sjkoshy 235233628SfabientSYSCTL_DECL(_kern_hwpmc); 236145256Sjkoshy 237174395Sjkoshystatic int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 238267992ShselaskySYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_RDTUN, 239174395Sjkoshy &pmc_callchaindepth, 0, "depth of call chain records"); 240174395Sjkoshy 241282641Sjhb#ifdef HWPMC_DEBUG 242147191Sjkoshystruct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 243145256Sjkoshychar pmc_debugstr[PMC_DEBUG_STRSIZE]; 244145256SjkoshyTUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 245145256Sjkoshy sizeof(pmc_debugstr)); 246145256SjkoshySYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 247267992Shselasky CTLTYPE_STRING | CTLFLAG_RWTUN | CTLFLAG_NOFETCH, 248145256Sjkoshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 249145256Sjkoshy#endif 250145256Sjkoshy 251145256Sjkoshy/* 252147191Sjkoshy * kern.hwpmc.hashrows -- determines the number of rows in the 253145256Sjkoshy * of the hash table used to look up threads 254145256Sjkoshy */ 255145256Sjkoshy 256145256Sjkoshystatic int pmc_hashsize = PMC_HASH_SIZE; 257267992ShselaskySYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_RDTUN, 258145256Sjkoshy &pmc_hashsize, 0, "rows in hash tables"); 259145256Sjkoshy 260145256Sjkoshy/* 261174395Sjkoshy * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU 262145256Sjkoshy */ 263145256Sjkoshy 264147191Sjkoshystatic int pmc_nsamples = PMC_NSAMPLES; 265267992ShselaskySYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_RDTUN, 266147191Sjkoshy &pmc_nsamples, 0, "number of PC samples per CPU"); 267145256Sjkoshy 268174395Sjkoshy 269145256Sjkoshy/* 270147191Sjkoshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 271145256Sjkoshy */ 272145256Sjkoshy 273145256Sjkoshystatic int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 274267992ShselaskySYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_RDTUN, 275145256Sjkoshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 276145256Sjkoshy 277145256Sjkoshy 278145256Sjkoshy/* 279145256Sjkoshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 280145256Sjkoshy * allocate system-wide PMCs. 281145256Sjkoshy * 282145256Sjkoshy * Allowing unprivileged processes to allocate system PMCs is convenient 283145256Sjkoshy * if system-wide measurements need to be taken concurrently with other 284145256Sjkoshy * per-process measurements. This feature is turned off by default. 285145256Sjkoshy */ 286145256Sjkoshy 287145256Sjkoshystatic int pmc_unprivileged_syspmcs = 0; 288267992ShselaskySYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RWTUN, 289145256Sjkoshy &pmc_unprivileged_syspmcs, 0, 290145256Sjkoshy "allow unprivileged process to allocate system PMCs"); 291145256Sjkoshy 292147191Sjkoshy/* 293147191Sjkoshy * Hash function. Discard the lower 2 bits of the pointer since 294147191Sjkoshy * these are always zero for our uses. The hash multiplier is 295147191Sjkoshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 296147191Sjkoshy */ 297145256Sjkoshy 298145256Sjkoshy#if LONG_BIT == 64 299145256Sjkoshy#define _PMC_HM 11400714819323198486u 300145256Sjkoshy#elif LONG_BIT == 32 301145256Sjkoshy#define _PMC_HM 2654435769u 302145256Sjkoshy#else 303145256Sjkoshy#error Must know the size of 'long' to compile 304145256Sjkoshy#endif 305145256Sjkoshy 306145256Sjkoshy#define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 307145256Sjkoshy 308145256Sjkoshy/* 309145256Sjkoshy * Syscall structures 310145256Sjkoshy */ 311145256Sjkoshy 312145256Sjkoshy/* The `sysent' for the new syscall */ 313145256Sjkoshystatic struct sysent pmc_sysent = { 314325546Skib .sy_narg = 2, 315325546Skib .sy_call = pmc_syscall_handler, 316145256Sjkoshy}; 317145256Sjkoshy 318145256Sjkoshystatic struct syscall_module_data pmc_syscall_mod = { 319325546Skib .chainevh = load, 320325546Skib .chainarg = NULL, 321325546Skib .offset = &pmc_syscall_num, 322325546Skib .new_sysent = &pmc_sysent, 323325546Skib .old_sysent = { .sy_narg = 0, .sy_call = NULL }, 324325546Skib .flags = SY_THR_STATIC_KLD, 325145256Sjkoshy}; 326145256Sjkoshy 327145256Sjkoshystatic moduledata_t pmc_mod = { 328325546Skib .name = PMC_MODULE_NAME, 329325546Skib .evhand = syscall_module_handler, 330325546Skib .priv = &pmc_syscall_mod, 331145256Sjkoshy}; 332145256Sjkoshy 333299746Sjhb#ifdef EARLY_AP_STARTUP 334299746SjhbDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SYSCALLS, SI_ORDER_ANY); 335299746Sjhb#else 336145256SjkoshyDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 337299746Sjhb#endif 338145256SjkoshyMODULE_VERSION(pmc, PMC_VERSION); 339145256Sjkoshy 340282641Sjhb#ifdef HWPMC_DEBUG 341147191Sjkoshyenum pmc_dbgparse_state { 342147191Sjkoshy PMCDS_WS, /* in whitespace */ 343147191Sjkoshy PMCDS_MAJOR, /* seen a major keyword */ 344147191Sjkoshy PMCDS_MINOR 345147191Sjkoshy}; 346147191Sjkoshy 347145256Sjkoshystatic int 348145256Sjkoshypmc_debugflags_parse(char *newstr, char *fence) 349145256Sjkoshy{ 350145313Sjkoshy char c, *p, *q; 351147191Sjkoshy struct pmc_debugflags *tmpflags; 352147191Sjkoshy int error, found, *newbits, tmp; 353147191Sjkoshy size_t kwlen; 354145256Sjkoshy 355184214Sdes tmpflags = malloc(sizeof(*tmpflags), M_PMC, M_WAITOK|M_ZERO); 356145256Sjkoshy 357145256Sjkoshy p = newstr; 358147191Sjkoshy error = 0; 359145256Sjkoshy 360147191Sjkoshy for (; p < fence && (c = *p); p++) { 361145256Sjkoshy 362147191Sjkoshy /* skip white space */ 363147191Sjkoshy if (c == ' ' || c == '\t') 364147191Sjkoshy continue; 365147191Sjkoshy 366147191Sjkoshy /* look for a keyword followed by "=" */ 367147191Sjkoshy for (q = p; p < fence && (c = *p) && c != '='; p++) 368147191Sjkoshy ; 369147191Sjkoshy if (c != '=') { 370147191Sjkoshy error = EINVAL; 371147191Sjkoshy goto done; 372145256Sjkoshy } 373145256Sjkoshy 374147191Sjkoshy kwlen = p - q; 375147191Sjkoshy newbits = NULL; 376145256Sjkoshy 377147191Sjkoshy /* lookup flag group name */ 378147191Sjkoshy#define DBG_SET_FLAG_MAJ(S,F) \ 379147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 380147191Sjkoshy newbits = &tmpflags->pdb_ ## F; 381145256Sjkoshy 382147191Sjkoshy DBG_SET_FLAG_MAJ("cpu", CPU); 383147191Sjkoshy DBG_SET_FLAG_MAJ("csw", CSW); 384147191Sjkoshy DBG_SET_FLAG_MAJ("logging", LOG); 385147191Sjkoshy DBG_SET_FLAG_MAJ("module", MOD); 386147191Sjkoshy DBG_SET_FLAG_MAJ("md", MDP); 387147191Sjkoshy DBG_SET_FLAG_MAJ("owner", OWN); 388147191Sjkoshy DBG_SET_FLAG_MAJ("pmc", PMC); 389147191Sjkoshy DBG_SET_FLAG_MAJ("process", PRC); 390147191Sjkoshy DBG_SET_FLAG_MAJ("sampling", SAM); 391145256Sjkoshy 392147191Sjkoshy if (newbits == NULL) { 393147191Sjkoshy error = EINVAL; 394147191Sjkoshy goto done; 395145256Sjkoshy } 396145256Sjkoshy 397147191Sjkoshy p++; /* skip the '=' */ 398145256Sjkoshy 399147191Sjkoshy /* Now parse the individual flags */ 400147191Sjkoshy tmp = 0; 401147191Sjkoshy newflag: 402147191Sjkoshy for (q = p; p < fence && (c = *p); p++) 403147191Sjkoshy if (c == ' ' || c == '\t' || c == ',') 404147191Sjkoshy break; 405147191Sjkoshy 406147191Sjkoshy /* p == fence or c == ws or c == "," or c == 0 */ 407147191Sjkoshy 408147191Sjkoshy if ((kwlen = p - q) == 0) { 409147191Sjkoshy *newbits = tmp; 410147191Sjkoshy continue; 411147191Sjkoshy } 412147191Sjkoshy 413147191Sjkoshy found = 0; 414147191Sjkoshy#define DBG_SET_FLAG_MIN(S,F) \ 415147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 416147191Sjkoshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 417147191Sjkoshy 418147191Sjkoshy /* a '*' denotes all possible flags in the group */ 419147191Sjkoshy if (kwlen == 1 && *q == '*') 420147191Sjkoshy tmp = found = ~0; 421147191Sjkoshy /* look for individual flag names */ 422147191Sjkoshy DBG_SET_FLAG_MIN("allocaterow", ALR); 423147191Sjkoshy DBG_SET_FLAG_MIN("allocate", ALL); 424147191Sjkoshy DBG_SET_FLAG_MIN("attach", ATT); 425147191Sjkoshy DBG_SET_FLAG_MIN("bind", BND); 426147191Sjkoshy DBG_SET_FLAG_MIN("config", CFG); 427147191Sjkoshy DBG_SET_FLAG_MIN("exec", EXC); 428147191Sjkoshy DBG_SET_FLAG_MIN("exit", EXT); 429147191Sjkoshy DBG_SET_FLAG_MIN("find", FND); 430147191Sjkoshy DBG_SET_FLAG_MIN("flush", FLS); 431147191Sjkoshy DBG_SET_FLAG_MIN("fork", FRK); 432147191Sjkoshy DBG_SET_FLAG_MIN("getbuf", GTB); 433147191Sjkoshy DBG_SET_FLAG_MIN("hook", PMH); 434147191Sjkoshy DBG_SET_FLAG_MIN("init", INI); 435147191Sjkoshy DBG_SET_FLAG_MIN("intr", INT); 436147191Sjkoshy DBG_SET_FLAG_MIN("linktarget", TLK); 437147191Sjkoshy DBG_SET_FLAG_MIN("mayberemove", OMR); 438147191Sjkoshy DBG_SET_FLAG_MIN("ops", OPS); 439147191Sjkoshy DBG_SET_FLAG_MIN("read", REA); 440147191Sjkoshy DBG_SET_FLAG_MIN("register", REG); 441147191Sjkoshy DBG_SET_FLAG_MIN("release", REL); 442147191Sjkoshy DBG_SET_FLAG_MIN("remove", ORM); 443147191Sjkoshy DBG_SET_FLAG_MIN("sample", SAM); 444147191Sjkoshy DBG_SET_FLAG_MIN("scheduleio", SIO); 445147191Sjkoshy DBG_SET_FLAG_MIN("select", SEL); 446147191Sjkoshy DBG_SET_FLAG_MIN("signal", SIG); 447147191Sjkoshy DBG_SET_FLAG_MIN("swi", SWI); 448147191Sjkoshy DBG_SET_FLAG_MIN("swo", SWO); 449147191Sjkoshy DBG_SET_FLAG_MIN("start", STA); 450147191Sjkoshy DBG_SET_FLAG_MIN("stop", STO); 451147191Sjkoshy DBG_SET_FLAG_MIN("syscall", PMS); 452147191Sjkoshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 453147191Sjkoshy DBG_SET_FLAG_MIN("write", WRI); 454147191Sjkoshy if (found == 0) { 455147191Sjkoshy /* unrecognized flag name */ 456147191Sjkoshy error = EINVAL; 457147191Sjkoshy goto done; 458147191Sjkoshy } 459147191Sjkoshy 460147191Sjkoshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 461147191Sjkoshy *newbits = tmp; 462147191Sjkoshy continue; 463147191Sjkoshy } 464147191Sjkoshy 465147191Sjkoshy p++; 466147191Sjkoshy goto newflag; 467145256Sjkoshy } 468145256Sjkoshy 469147191Sjkoshy /* save the new flag set */ 470147191Sjkoshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 471145256Sjkoshy 472147191Sjkoshy done: 473184205Sdes free(tmpflags, M_PMC); 474147191Sjkoshy return error; 475145256Sjkoshy} 476145256Sjkoshy 477145256Sjkoshystatic int 478145256Sjkoshypmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 479145256Sjkoshy{ 480145256Sjkoshy char *fence, *newstr; 481145256Sjkoshy int error; 482145256Sjkoshy unsigned int n; 483145256Sjkoshy 484145256Sjkoshy (void) arg1; (void) arg2; /* unused parameters */ 485145256Sjkoshy 486145256Sjkoshy n = sizeof(pmc_debugstr); 487184802Sjkoshy newstr = malloc(n, M_PMC, M_WAITOK|M_ZERO); 488147191Sjkoshy (void) strlcpy(newstr, pmc_debugstr, n); 489145256Sjkoshy 490145256Sjkoshy error = sysctl_handle_string(oidp, newstr, n, req); 491145256Sjkoshy 492145256Sjkoshy /* if there is a new string, parse and copy it */ 493145256Sjkoshy if (error == 0 && req->newptr != NULL) { 494147191Sjkoshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 495145256Sjkoshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 496145256Sjkoshy (void) strlcpy(pmc_debugstr, newstr, 497145256Sjkoshy sizeof(pmc_debugstr)); 498145256Sjkoshy } 499145256Sjkoshy 500184205Sdes free(newstr, M_PMC); 501145256Sjkoshy 502145256Sjkoshy return error; 503145256Sjkoshy} 504145256Sjkoshy#endif 505145256Sjkoshy 506145256Sjkoshy/* 507184802Sjkoshy * Map a row index to a classdep structure and return the adjusted row 508184802Sjkoshy * index for the PMC class index. 509184802Sjkoshy */ 510184802Sjkoshystatic struct pmc_classdep * 511184802Sjkoshypmc_ri_to_classdep(struct pmc_mdep *md, int ri, int *adjri) 512184802Sjkoshy{ 513184802Sjkoshy struct pmc_classdep *pcd; 514184802Sjkoshy 515184802Sjkoshy (void) md; 516184802Sjkoshy 517184802Sjkoshy KASSERT(ri >= 0 && ri < md->pmd_npmc, 518184802Sjkoshy ("[pmc,%d] illegal row-index %d", __LINE__, ri)); 519184802Sjkoshy 520184802Sjkoshy pcd = pmc_rowindex_to_classdep[ri]; 521184802Sjkoshy 522184802Sjkoshy KASSERT(pcd != NULL, 523198204Srpaulo ("[pmc,%d] ri %d null pcd", __LINE__, ri)); 524184802Sjkoshy 525184802Sjkoshy *adjri = ri - pcd->pcd_ri; 526184802Sjkoshy 527184802Sjkoshy KASSERT(*adjri >= 0 && *adjri < pcd->pcd_num, 528184802Sjkoshy ("[pmc,%d] adjusted row-index %d", __LINE__, *adjri)); 529184802Sjkoshy 530184802Sjkoshy return (pcd); 531184802Sjkoshy} 532184802Sjkoshy 533184802Sjkoshy/* 534145256Sjkoshy * Concurrency Control 535145256Sjkoshy * 536145256Sjkoshy * The driver manages the following data structures: 537145256Sjkoshy * 538145256Sjkoshy * - target process descriptors, one per target process 539145256Sjkoshy * - owner process descriptors (and attached lists), one per owner process 540145256Sjkoshy * - lookup hash tables for owner and target processes 541145256Sjkoshy * - PMC descriptors (and attached lists) 542145256Sjkoshy * - per-cpu hardware state 543145256Sjkoshy * - the 'hook' variable through which the kernel calls into 544145256Sjkoshy * this module 545145256Sjkoshy * - the machine hardware state (managed by the MD layer) 546145256Sjkoshy * 547145256Sjkoshy * These data structures are accessed from: 548145256Sjkoshy * 549145256Sjkoshy * - thread context-switch code 550145256Sjkoshy * - interrupt handlers (possibly on multiple cpus) 551145256Sjkoshy * - kernel threads on multiple cpus running on behalf of user 552145256Sjkoshy * processes doing system calls 553145256Sjkoshy * - this driver's private kernel threads 554145256Sjkoshy * 555145256Sjkoshy * = Locks and Locking strategy = 556145256Sjkoshy * 557145256Sjkoshy * The driver uses four locking strategies for its operation: 558145256Sjkoshy * 559168856Sjkoshy * - The global SX lock "pmc_sx" is used to protect internal 560168856Sjkoshy * data structures. 561145256Sjkoshy * 562168856Sjkoshy * Calls into the module by syscall() start with this lock being 563168856Sjkoshy * held in exclusive mode. Depending on the requested operation, 564168856Sjkoshy * the lock may be downgraded to 'shared' mode to allow more 565168856Sjkoshy * concurrent readers into the module. Calls into the module from 566168856Sjkoshy * other parts of the kernel acquire the lock in shared mode. 567145256Sjkoshy * 568145256Sjkoshy * This SX lock is held in exclusive mode for any operations that 569145256Sjkoshy * modify the linkages between the driver's internal data structures. 570145256Sjkoshy * 571145256Sjkoshy * The 'pmc_hook' function pointer is also protected by this lock. 572145256Sjkoshy * It is only examined with the sx lock held in exclusive mode. The 573168856Sjkoshy * kernel module is allowed to be unloaded only with the sx lock held 574168856Sjkoshy * in exclusive mode. In normal syscall handling, after acquiring the 575168856Sjkoshy * pmc_sx lock we first check that 'pmc_hook' is non-null before 576168856Sjkoshy * proceeding. This prevents races between the thread unloading the module 577168856Sjkoshy * and other threads seeking to use the module. 578145256Sjkoshy * 579145256Sjkoshy * - Lookups of target process structures and owner process structures 580145256Sjkoshy * cannot use the global "pmc_sx" SX lock because these lookups need 581145256Sjkoshy * to happen during context switches and in other critical sections 582145256Sjkoshy * where sleeping is not allowed. We protect these lookup tables 583145256Sjkoshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 584168856Sjkoshy * "pmc_ownerhash_mtx". 585145256Sjkoshy * 586145256Sjkoshy * - Interrupt handlers work in a lock free manner. At interrupt 587145256Sjkoshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 588145256Sjkoshy * when the PMC was started. If this pointer is NULL, the interrupt 589145256Sjkoshy * is ignored after updating driver statistics. We ensure that this 590145256Sjkoshy * pointer is set (using an atomic operation if necessary) before the 591145256Sjkoshy * PMC hardware is started. Conversely, this pointer is unset atomically 592145256Sjkoshy * only after the PMC hardware is stopped. 593145256Sjkoshy * 594145256Sjkoshy * We ensure that everything needed for the operation of an 595145256Sjkoshy * interrupt handler is available without it needing to acquire any 596145256Sjkoshy * locks. We also ensure that a PMC's software state is destroyed only 597145256Sjkoshy * after the PMC is taken off hardware (on all CPUs). 598145256Sjkoshy * 599145256Sjkoshy * - Context-switch handling with process-private PMCs needs more 600145256Sjkoshy * care. 601145256Sjkoshy * 602145256Sjkoshy * A given process may be the target of multiple PMCs. For example, 603145256Sjkoshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 604145256Sjkoshy * while the target process is running on another. A PMC could also 605145256Sjkoshy * be getting released because its owner is exiting. We tackle 606145256Sjkoshy * these situations in the following manner: 607145256Sjkoshy * 608145256Sjkoshy * - each target process structure 'pmc_process' has an array 609145256Sjkoshy * of 'struct pmc *' pointers, one for each hardware PMC. 610145256Sjkoshy * 611145256Sjkoshy * - At context switch IN time, each "target" PMC in RUNNING state 612145256Sjkoshy * gets started on hardware and a pointer to each PMC is copied into 613145256Sjkoshy * the per-cpu phw array. The 'runcount' for the PMC is 614145256Sjkoshy * incremented. 615145256Sjkoshy * 616145256Sjkoshy * - At context switch OUT time, all process-virtual PMCs are stopped 617145256Sjkoshy * on hardware. The saved value is added to the PMCs value field 618145256Sjkoshy * only if the PMC is in a non-deleted state (the PMCs state could 619145256Sjkoshy * have changed during the current time slice). 620145256Sjkoshy * 621145256Sjkoshy * Note that since in-between a switch IN on a processor and a switch 622145256Sjkoshy * OUT, the PMC could have been released on another CPU. Therefore 623145256Sjkoshy * context switch OUT always looks at the hardware state to turn 624145256Sjkoshy * OFF PMCs and will update a PMC's saved value only if reachable 625145256Sjkoshy * from the target process record. 626145256Sjkoshy * 627145256Sjkoshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 628145256Sjkoshy * be attached to many processes at the time of the call and could 629145256Sjkoshy * be active on multiple CPUs). 630145256Sjkoshy * 631145256Sjkoshy * We prevent further scheduling of the PMC by marking it as in 632145256Sjkoshy * state 'DELETED'. If the runcount of the PMC is non-zero then 633145256Sjkoshy * this PMC is currently running on a CPU somewhere. The thread 634167086Sjhb * doing the PMCRELEASE operation waits by repeatedly doing a 635167086Sjhb * pause() till the runcount comes to zero. 636145256Sjkoshy * 637168856Sjkoshy * The contents of a PMC descriptor (struct pmc) are protected using 638168856Sjkoshy * a spin-mutex. In order to save space, we use a mutex pool. 639168856Sjkoshy * 640168856Sjkoshy * In terms of lock types used by witness(4), we use: 641168856Sjkoshy * - Type "pmc-sx", used by the global SX lock. 642168856Sjkoshy * - Type "pmc-sleep", for sleep mutexes used by logger threads. 643168856Sjkoshy * - Type "pmc-per-proc", for protecting PMC owner descriptors. 644168856Sjkoshy * - Type "pmc-leaf", used for all other spin mutexes. 645145256Sjkoshy */ 646145256Sjkoshy 647145256Sjkoshy/* 648145256Sjkoshy * save the cpu binding of the current kthread 649145256Sjkoshy */ 650145256Sjkoshy 651145256Sjkoshystatic void 652145256Sjkoshypmc_save_cpu_binding(struct pmc_binding *pb) 653145256Sjkoshy{ 654282658Sjhb PMCDBG0(CPU,BND,2, "save-cpu"); 655170307Sjeff thread_lock(curthread); 656145256Sjkoshy pb->pb_bound = sched_is_bound(curthread); 657145256Sjkoshy pb->pb_cpu = curthread->td_oncpu; 658170307Sjeff thread_unlock(curthread); 659282658Sjhb PMCDBG1(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 660145256Sjkoshy} 661145256Sjkoshy 662145256Sjkoshy/* 663145256Sjkoshy * restore the cpu binding of the current thread 664145256Sjkoshy */ 665145256Sjkoshy 666145256Sjkoshystatic void 667145256Sjkoshypmc_restore_cpu_binding(struct pmc_binding *pb) 668145256Sjkoshy{ 669282658Sjhb PMCDBG2(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 670145256Sjkoshy curthread->td_oncpu, pb->pb_cpu); 671170307Sjeff thread_lock(curthread); 672145256Sjkoshy if (pb->pb_bound) 673145256Sjkoshy sched_bind(curthread, pb->pb_cpu); 674145256Sjkoshy else 675145256Sjkoshy sched_unbind(curthread); 676170307Sjeff thread_unlock(curthread); 677282658Sjhb PMCDBG0(CPU,BND,2, "restore-cpu done"); 678145256Sjkoshy} 679145256Sjkoshy 680145256Sjkoshy/* 681145256Sjkoshy * move execution over the specified cpu and bind it there. 682145256Sjkoshy */ 683145256Sjkoshy 684145256Sjkoshystatic void 685145256Sjkoshypmc_select_cpu(int cpu) 686145256Sjkoshy{ 687183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 688145256Sjkoshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 689145256Sjkoshy 690183266Sjkoshy /* Never move to an inactive CPU. */ 691183266Sjkoshy KASSERT(pmc_cpu_is_active(cpu), ("[pmc,%d] selecting inactive " 692183266Sjkoshy "CPU %d", __LINE__, cpu)); 693145256Sjkoshy 694282658Sjhb PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d", cpu); 695170307Sjeff thread_lock(curthread); 696145256Sjkoshy sched_bind(curthread, cpu); 697170307Sjeff thread_unlock(curthread); 698145256Sjkoshy 699145256Sjkoshy KASSERT(curthread->td_oncpu == cpu, 700145256Sjkoshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 701145256Sjkoshy cpu, curthread->td_oncpu)); 702145256Sjkoshy 703282658Sjhb PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 704145256Sjkoshy} 705145256Sjkoshy 706145256Sjkoshy/* 707145774Sjkoshy * Force a context switch. 708145774Sjkoshy * 709167086Sjhb * We do this by pause'ing for 1 tick -- invoking mi_switch() is not 710145774Sjkoshy * guaranteed to force a context switch. 711145774Sjkoshy */ 712145774Sjkoshy 713145774Sjkoshystatic void 714145774Sjkoshypmc_force_context_switch(void) 715145774Sjkoshy{ 716145774Sjkoshy 717167086Sjhb pause("pmcctx", 1); 718145774Sjkoshy} 719145774Sjkoshy 720145774Sjkoshy/* 721147191Sjkoshy * Get the file name for an executable. This is a simple wrapper 722147191Sjkoshy * around vn_fullpath(9). 723145256Sjkoshy */ 724145256Sjkoshy 725147191Sjkoshystatic void 726147708Sjkoshypmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 727145256Sjkoshy{ 728145256Sjkoshy 729147191Sjkoshy *fullpath = "unknown"; 730147191Sjkoshy *freepath = NULL; 731175294Sattilio vn_fullpath(curthread, v, fullpath, freepath); 732145256Sjkoshy} 733145256Sjkoshy 734145256Sjkoshy/* 735145256Sjkoshy * remove an process owning PMCs 736145256Sjkoshy */ 737145256Sjkoshy 738145256Sjkoshyvoid 739145256Sjkoshypmc_remove_owner(struct pmc_owner *po) 740145256Sjkoshy{ 741147191Sjkoshy struct pmc *pm, *tmp; 742145256Sjkoshy 743145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 744145256Sjkoshy 745282658Sjhb PMCDBG1(OWN,ORM,1, "remove-owner po=%p", po); 746145256Sjkoshy 747145256Sjkoshy /* Remove descriptor from the owner hash table */ 748145256Sjkoshy LIST_REMOVE(po, po_next); 749145256Sjkoshy 750147191Sjkoshy /* release all owned PMC descriptors */ 751147191Sjkoshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 752282658Sjhb PMCDBG1(OWN,ORM,2, "pmc=%p", pm); 753147191Sjkoshy KASSERT(pm->pm_owner == po, 754147191Sjkoshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 755145256Sjkoshy 756147191Sjkoshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 757273236Smarkj pmc_destroy_pmc_descriptor(pm); 758145256Sjkoshy } 759145256Sjkoshy 760147191Sjkoshy KASSERT(po->po_sscount == 0, 761147191Sjkoshy ("[pmc,%d] SS count not zero", __LINE__)); 762145256Sjkoshy KASSERT(LIST_EMPTY(&po->po_pmcs), 763147191Sjkoshy ("[pmc,%d] PMC list not empty", __LINE__)); 764145256Sjkoshy 765147191Sjkoshy /* de-configure the log file if present */ 766145774Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 767147191Sjkoshy pmclog_deconfigure_log(po); 768145256Sjkoshy} 769145256Sjkoshy 770145256Sjkoshy/* 771145256Sjkoshy * remove an owner process record if all conditions are met. 772145256Sjkoshy */ 773145256Sjkoshy 774145256Sjkoshystatic void 775145256Sjkoshypmc_maybe_remove_owner(struct pmc_owner *po) 776145256Sjkoshy{ 777145256Sjkoshy 778282658Sjhb PMCDBG1(OWN,OMR,1, "maybe-remove-owner po=%p", po); 779145256Sjkoshy 780145256Sjkoshy /* 781145256Sjkoshy * Remove owner record if 782145256Sjkoshy * - this process does not own any PMCs 783145256Sjkoshy * - this process has not allocated a system-wide sampling buffer 784145256Sjkoshy */ 785145256Sjkoshy 786145256Sjkoshy if (LIST_EMPTY(&po->po_pmcs) && 787145774Sjkoshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 788145256Sjkoshy pmc_remove_owner(po); 789147191Sjkoshy pmc_destroy_owner_descriptor(po); 790145256Sjkoshy } 791145256Sjkoshy} 792145256Sjkoshy 793145256Sjkoshy/* 794145256Sjkoshy * Add an association between a target process and a PMC. 795145256Sjkoshy */ 796145256Sjkoshy 797145256Sjkoshystatic void 798145256Sjkoshypmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 799145256Sjkoshy{ 800145256Sjkoshy int ri; 801145256Sjkoshy struct pmc_target *pt; 802145256Sjkoshy 803145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 804145256Sjkoshy 805145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 806145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 807147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 808147191Sjkoshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 809147191Sjkoshy __LINE__, pm, pp->pp_proc->p_pid)); 810198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= ((int) md->pmd_npmc - 1), 811145256Sjkoshy ("[pmc,%d] Illegal reference count %d for process record %p", 812145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 813145256Sjkoshy 814145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 815145256Sjkoshy 816282658Sjhb PMCDBG3(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 817145256Sjkoshy pm, ri, pp); 818145256Sjkoshy 819282641Sjhb#ifdef HWPMC_DEBUG 820145256Sjkoshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 821145256Sjkoshy if (pt->pt_process == pp) 822145256Sjkoshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 823145256Sjkoshy __LINE__, pp, pm)); 824145256Sjkoshy#endif 825145256Sjkoshy 826184802Sjkoshy pt = malloc(sizeof(struct pmc_target), M_PMC, M_WAITOK|M_ZERO); 827145256Sjkoshy pt->pt_process = pp; 828145256Sjkoshy 829145256Sjkoshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 830145256Sjkoshy 831148067Sjhb atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 832148067Sjhb (uintptr_t)pm); 833145256Sjkoshy 834145615Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) 835145774Sjkoshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 836145615Sjkoshy 837147191Sjkoshy /* 838147191Sjkoshy * Initialize the per-process values at this row index. 839147191Sjkoshy */ 840147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 841147191Sjkoshy pm->pm_sc.pm_reloadcount : 0; 842147191Sjkoshy 843145256Sjkoshy pp->pp_refcnt++; 844145256Sjkoshy 845145256Sjkoshy} 846145256Sjkoshy 847145256Sjkoshy/* 848145256Sjkoshy * Removes the association between a target process and a PMC. 849145256Sjkoshy */ 850145256Sjkoshy 851145256Sjkoshystatic void 852145256Sjkoshypmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 853145256Sjkoshy{ 854145256Sjkoshy int ri; 855147191Sjkoshy struct proc *p; 856145256Sjkoshy struct pmc_target *ptgt; 857145256Sjkoshy 858145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 859145256Sjkoshy 860145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 861145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 862145256Sjkoshy 863198343Sfabient KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt <= (int) md->pmd_npmc, 864145256Sjkoshy ("[pmc,%d] Illegal ref count %d on process record %p", 865145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 866145256Sjkoshy 867145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 868145256Sjkoshy 869282658Sjhb PMCDBG3(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 870145256Sjkoshy pm, ri, pp); 871145256Sjkoshy 872145256Sjkoshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 873145256Sjkoshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 874145256Sjkoshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 875145256Sjkoshy 876145256Sjkoshy pp->pp_pmcs[ri].pp_pmc = NULL; 877145256Sjkoshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 878145256Sjkoshy 879145774Sjkoshy /* Remove owner-specific flags */ 880145774Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) { 881145774Sjkoshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 882145774Sjkoshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 883145774Sjkoshy } 884145615Sjkoshy 885145256Sjkoshy pp->pp_refcnt--; 886145256Sjkoshy 887145256Sjkoshy /* Remove the target process from the PMC structure */ 888145256Sjkoshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 889145256Sjkoshy if (ptgt->pt_process == pp) 890145256Sjkoshy break; 891145256Sjkoshy 892145256Sjkoshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 893145256Sjkoshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 894145256Sjkoshy 895145256Sjkoshy LIST_REMOVE(ptgt, pt_next); 896184205Sdes free(ptgt, M_PMC); 897145256Sjkoshy 898147191Sjkoshy /* if the PMC now lacks targets, send the owner a SIGIO */ 899147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) { 900147191Sjkoshy p = pm->pm_owner->po_owner; 901147191Sjkoshy PROC_LOCK(p); 902225617Skmacy kern_psignal(p, SIGIO); 903147191Sjkoshy PROC_UNLOCK(p); 904145256Sjkoshy 905282658Sjhb PMCDBG2(PRC,SIG,2, "signalling proc=%p signal=%d", p, 906147191Sjkoshy SIGIO); 907145256Sjkoshy } 908145256Sjkoshy} 909145256Sjkoshy 910145256Sjkoshy/* 911145256Sjkoshy * Check if PMC 'pm' may be attached to target process 't'. 912145256Sjkoshy */ 913145256Sjkoshy 914145256Sjkoshystatic int 915145256Sjkoshypmc_can_attach(struct pmc *pm, struct proc *t) 916145256Sjkoshy{ 917145256Sjkoshy struct proc *o; /* pmc owner */ 918145256Sjkoshy struct ucred *oc, *tc; /* owner, target credentials */ 919145256Sjkoshy int decline_attach, i; 920145256Sjkoshy 921145256Sjkoshy /* 922145256Sjkoshy * A PMC's owner can always attach that PMC to itself. 923145256Sjkoshy */ 924145256Sjkoshy 925145256Sjkoshy if ((o = pm->pm_owner->po_owner) == t) 926145256Sjkoshy return 0; 927145256Sjkoshy 928145256Sjkoshy PROC_LOCK(o); 929145256Sjkoshy oc = o->p_ucred; 930145256Sjkoshy crhold(oc); 931145256Sjkoshy PROC_UNLOCK(o); 932145256Sjkoshy 933145256Sjkoshy PROC_LOCK(t); 934145256Sjkoshy tc = t->p_ucred; 935145256Sjkoshy crhold(tc); 936145256Sjkoshy PROC_UNLOCK(t); 937145256Sjkoshy 938145256Sjkoshy /* 939145256Sjkoshy * The effective uid of the PMC owner should match at least one 940145256Sjkoshy * of the {effective,real,saved} uids of the target process. 941145256Sjkoshy */ 942145256Sjkoshy 943145256Sjkoshy decline_attach = oc->cr_uid != tc->cr_uid && 944145256Sjkoshy oc->cr_uid != tc->cr_svuid && 945145256Sjkoshy oc->cr_uid != tc->cr_ruid; 946145256Sjkoshy 947145256Sjkoshy /* 948145256Sjkoshy * Every one of the target's group ids, must be in the owner's 949145256Sjkoshy * group list. 950145256Sjkoshy */ 951145256Sjkoshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 952145256Sjkoshy decline_attach = !groupmember(tc->cr_groups[i], oc); 953145256Sjkoshy 954145256Sjkoshy /* check the read and saved gids too */ 955145256Sjkoshy if (decline_attach == 0) 956145256Sjkoshy decline_attach = !groupmember(tc->cr_rgid, oc) || 957145256Sjkoshy !groupmember(tc->cr_svgid, oc); 958145256Sjkoshy 959145256Sjkoshy crfree(tc); 960145256Sjkoshy crfree(oc); 961145256Sjkoshy 962145256Sjkoshy return !decline_attach; 963145256Sjkoshy} 964145256Sjkoshy 965145256Sjkoshy/* 966145256Sjkoshy * Attach a process to a PMC. 967145256Sjkoshy */ 968145256Sjkoshy 969145256Sjkoshystatic int 970145256Sjkoshypmc_attach_one_process(struct proc *p, struct pmc *pm) 971145256Sjkoshy{ 972145256Sjkoshy int ri; 973147191Sjkoshy char *fullpath, *freepath; 974145256Sjkoshy struct pmc_process *pp; 975145256Sjkoshy 976145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 977145256Sjkoshy 978282658Sjhb PMCDBG5(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 979145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 980145256Sjkoshy 981145256Sjkoshy /* 982145256Sjkoshy * Locate the process descriptor corresponding to process 'p', 983145256Sjkoshy * allocating space as needed. 984145256Sjkoshy * 985145256Sjkoshy * Verify that rowindex 'pm_rowindex' is free in the process 986145256Sjkoshy * descriptor. 987145256Sjkoshy * 988145256Sjkoshy * If not, allocate space for a descriptor and link the 989145256Sjkoshy * process descriptor and PMC. 990145256Sjkoshy */ 991145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 992145256Sjkoshy 993145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 994145256Sjkoshy return ENOMEM; 995145256Sjkoshy 996145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 997145256Sjkoshy return EEXIST; 998145256Sjkoshy 999145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 1000145256Sjkoshy return EBUSY; 1001145256Sjkoshy 1002145256Sjkoshy pmc_link_target_process(pm, pp); 1003145256Sjkoshy 1004147191Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 1005147191Sjkoshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 1006147191Sjkoshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 1007147191Sjkoshy 1008147191Sjkoshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 1009147191Sjkoshy 1010147191Sjkoshy /* issue an attach event to a configured log file */ 1011147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 1012295435Skib if (p->p_flag & P_KPROC) { 1013180794Sjeff fullpath = kernelname; 1014180794Sjeff freepath = NULL; 1015295352Skib } else { 1016295352Skib pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1017180794Sjeff pmclog_process_pmcattach(pm, p->p_pid, fullpath); 1018295352Skib } 1019295352Skib free(freepath, M_TEMP); 1020174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1021174395Sjkoshy pmc_log_process_mappings(pm->pm_owner, p); 1022147191Sjkoshy } 1023145256Sjkoshy /* mark process as using HWPMCs */ 1024145256Sjkoshy PROC_LOCK(p); 1025145256Sjkoshy p->p_flag |= P_HWPMC; 1026145256Sjkoshy PROC_UNLOCK(p); 1027145256Sjkoshy 1028145256Sjkoshy return 0; 1029145256Sjkoshy} 1030145256Sjkoshy 1031145256Sjkoshy/* 1032145256Sjkoshy * Attach a process and optionally its children 1033145256Sjkoshy */ 1034145256Sjkoshy 1035145256Sjkoshystatic int 1036145256Sjkoshypmc_attach_process(struct proc *p, struct pmc *pm) 1037145256Sjkoshy{ 1038145256Sjkoshy int error; 1039145256Sjkoshy struct proc *top; 1040145256Sjkoshy 1041145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1042145256Sjkoshy 1043282658Sjhb PMCDBG5(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 1044145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1045145256Sjkoshy 1046145774Sjkoshy 1047145774Sjkoshy /* 1048145774Sjkoshy * If this PMC successfully allowed a GETMSR operation 1049145774Sjkoshy * in the past, disallow further ATTACHes. 1050145774Sjkoshy */ 1051145774Sjkoshy 1052145774Sjkoshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 1053145774Sjkoshy return EPERM; 1054145774Sjkoshy 1055145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1056145256Sjkoshy return pmc_attach_one_process(p, pm); 1057145256Sjkoshy 1058145256Sjkoshy /* 1059145256Sjkoshy * Traverse all child processes, attaching them to 1060145256Sjkoshy * this PMC. 1061145256Sjkoshy */ 1062145256Sjkoshy 1063145256Sjkoshy sx_slock(&proctree_lock); 1064145256Sjkoshy 1065145256Sjkoshy top = p; 1066145256Sjkoshy 1067145256Sjkoshy for (;;) { 1068145256Sjkoshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1069145256Sjkoshy break; 1070145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1071145256Sjkoshy p = LIST_FIRST(&p->p_children); 1072145256Sjkoshy else for (;;) { 1073145256Sjkoshy if (p == top) 1074145256Sjkoshy goto done; 1075145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1076145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1077145256Sjkoshy break; 1078145256Sjkoshy } 1079145256Sjkoshy p = p->p_pptr; 1080145256Sjkoshy } 1081145256Sjkoshy } 1082145256Sjkoshy 1083145256Sjkoshy if (error) 1084145256Sjkoshy (void) pmc_detach_process(top, pm); 1085145256Sjkoshy 1086145256Sjkoshy done: 1087145256Sjkoshy sx_sunlock(&proctree_lock); 1088145256Sjkoshy return error; 1089145256Sjkoshy} 1090145256Sjkoshy 1091145256Sjkoshy/* 1092145256Sjkoshy * Detach a process from a PMC. If there are no other PMCs tracking 1093145256Sjkoshy * this process, remove the process structure from its hash table. If 1094145256Sjkoshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1095145256Sjkoshy */ 1096145256Sjkoshy 1097145256Sjkoshystatic int 1098145256Sjkoshypmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1099145256Sjkoshy{ 1100145256Sjkoshy int ri; 1101145256Sjkoshy struct pmc_process *pp; 1102145256Sjkoshy 1103145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1104145256Sjkoshy 1105145256Sjkoshy KASSERT(pm != NULL, 1106145256Sjkoshy ("[pmc,%d] null pm pointer", __LINE__)); 1107145256Sjkoshy 1108145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1109145774Sjkoshy 1110282658Sjhb PMCDBG6(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1111145774Sjkoshy pm, ri, p, p->p_pid, p->p_comm, flags); 1112145256Sjkoshy 1113145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1114145256Sjkoshy return ESRCH; 1115145256Sjkoshy 1116145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1117145256Sjkoshy return EINVAL; 1118145256Sjkoshy 1119145256Sjkoshy pmc_unlink_target_process(pm, pp); 1120145256Sjkoshy 1121147191Sjkoshy /* Issue a detach entry if a log file is configured */ 1122147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1123147191Sjkoshy pmclog_process_pmcdetach(pm, p->p_pid); 1124147191Sjkoshy 1125145256Sjkoshy /* 1126298931Spfg * If there are no PMCs targeting this process, we remove its 1127145256Sjkoshy * descriptor from the target hash table and unset the P_HWPMC 1128145256Sjkoshy * flag in the struct proc. 1129145256Sjkoshy */ 1130198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1131145256Sjkoshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1132145256Sjkoshy __LINE__, pp->pp_refcnt, pp)); 1133145256Sjkoshy 1134145256Sjkoshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1135145256Sjkoshy return 0; 1136145256Sjkoshy 1137145256Sjkoshy pmc_remove_process_descriptor(pp); 1138145256Sjkoshy 1139145256Sjkoshy if (flags & PMC_FLAG_REMOVE) 1140184205Sdes free(pp, M_PMC); 1141145256Sjkoshy 1142145256Sjkoshy PROC_LOCK(p); 1143145256Sjkoshy p->p_flag &= ~P_HWPMC; 1144145256Sjkoshy PROC_UNLOCK(p); 1145145256Sjkoshy 1146145256Sjkoshy return 0; 1147145256Sjkoshy} 1148145256Sjkoshy 1149145256Sjkoshy/* 1150145256Sjkoshy * Detach a process and optionally its descendants from a PMC. 1151145256Sjkoshy */ 1152145256Sjkoshy 1153145256Sjkoshystatic int 1154145256Sjkoshypmc_detach_process(struct proc *p, struct pmc *pm) 1155145256Sjkoshy{ 1156145256Sjkoshy struct proc *top; 1157145256Sjkoshy 1158145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1159145256Sjkoshy 1160282658Sjhb PMCDBG5(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1161145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1162145256Sjkoshy 1163145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1164145256Sjkoshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1165145256Sjkoshy 1166145256Sjkoshy /* 1167145256Sjkoshy * Traverse all children, detaching them from this PMC. We 1168145256Sjkoshy * ignore errors since we could be detaching a PMC from a 1169145256Sjkoshy * partially attached proc tree. 1170145256Sjkoshy */ 1171145256Sjkoshy 1172145256Sjkoshy sx_slock(&proctree_lock); 1173145256Sjkoshy 1174145256Sjkoshy top = p; 1175145256Sjkoshy 1176145256Sjkoshy for (;;) { 1177145256Sjkoshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1178145256Sjkoshy 1179145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1180145256Sjkoshy p = LIST_FIRST(&p->p_children); 1181145256Sjkoshy else for (;;) { 1182145256Sjkoshy if (p == top) 1183145256Sjkoshy goto done; 1184145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1185145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1186145256Sjkoshy break; 1187145256Sjkoshy } 1188145256Sjkoshy p = p->p_pptr; 1189145256Sjkoshy } 1190145256Sjkoshy } 1191145256Sjkoshy 1192145256Sjkoshy done: 1193145256Sjkoshy sx_sunlock(&proctree_lock); 1194147191Sjkoshy 1195147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 1196147191Sjkoshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1197147191Sjkoshy 1198145256Sjkoshy return 0; 1199145256Sjkoshy} 1200145256Sjkoshy 1201147191Sjkoshy 1202145256Sjkoshy/* 1203147191Sjkoshy * Thread context switch IN 1204145256Sjkoshy */ 1205145256Sjkoshy 1206147191Sjkoshystatic void 1207147191Sjkoshypmc_process_csw_in(struct thread *td) 1208147191Sjkoshy{ 1209147191Sjkoshy int cpu; 1210184802Sjkoshy unsigned int adjri, ri; 1211147191Sjkoshy struct pmc *pm; 1212147191Sjkoshy struct proc *p; 1213147191Sjkoshy struct pmc_cpu *pc; 1214147191Sjkoshy struct pmc_hw *phw; 1215184802Sjkoshy pmc_value_t newvalue; 1216147191Sjkoshy struct pmc_process *pp; 1217184802Sjkoshy struct pmc_classdep *pcd; 1218145256Sjkoshy 1219147191Sjkoshy p = td->td_proc; 1220145256Sjkoshy 1221147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1222147191Sjkoshy return; 1223145256Sjkoshy 1224147191Sjkoshy KASSERT(pp->pp_proc == td->td_proc, 1225147191Sjkoshy ("[pmc,%d] not my thread state", __LINE__)); 1226145256Sjkoshy 1227147191Sjkoshy critical_enter(); /* no preemption from this point */ 1228145256Sjkoshy 1229147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1230145256Sjkoshy 1231282658Sjhb PMCDBG5(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1232147191Sjkoshy p->p_pid, p->p_comm, pp); 1233145256Sjkoshy 1234183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1235298931Spfg ("[pmc,%d] weird CPU id %d", __LINE__, cpu)); 1236145256Sjkoshy 1237147191Sjkoshy pc = pmc_pcpu[cpu]; 1238145256Sjkoshy 1239147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1240145256Sjkoshy 1241147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1242147191Sjkoshy continue; 1243147191Sjkoshy 1244147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1245147191Sjkoshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1246147191Sjkoshy __LINE__, PMC_TO_MODE(pm))); 1247147191Sjkoshy 1248147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1249147191Sjkoshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1250147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1251147191Sjkoshy 1252145256Sjkoshy /* 1253147191Sjkoshy * Only PMCs that are marked as 'RUNNING' need 1254147191Sjkoshy * be placed on hardware. 1255145256Sjkoshy */ 1256145256Sjkoshy 1257147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 1258147191Sjkoshy continue; 1259145256Sjkoshy 1260147191Sjkoshy /* increment PMC runcount */ 1261208861Sfabient atomic_add_rel_int(&pm->pm_runcount, 1); 1262145256Sjkoshy 1263147191Sjkoshy /* configure the HWPMC we are going to use. */ 1264184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1265184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, pm); 1266145256Sjkoshy 1267147191Sjkoshy phw = pc->pc_hwpmcs[ri]; 1268145256Sjkoshy 1269147191Sjkoshy KASSERT(phw != NULL, 1270147191Sjkoshy ("[pmc,%d] null hw pointer", __LINE__)); 1271145256Sjkoshy 1272147191Sjkoshy KASSERT(phw->phw_pmc == pm, 1273147191Sjkoshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1274147191Sjkoshy phw->phw_pmc, pm)); 1275145256Sjkoshy 1276147191Sjkoshy /* 1277147191Sjkoshy * Write out saved value and start the PMC. 1278147191Sjkoshy * 1279147191Sjkoshy * Sampling PMCs use a per-process value, while 1280147191Sjkoshy * counting mode PMCs use a per-pmc value that is 1281147191Sjkoshy * inherited across descendants. 1282147191Sjkoshy */ 1283147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1284147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1285290930Sjtl 1286290930Sjtl /* 1287290930Sjtl * Use the saved value calculated after the most recent 1288290930Sjtl * thread switch out to start this counter. Reset 1289290930Sjtl * the saved count in case another thread from this 1290290930Sjtl * process switches in before any threads switch out. 1291290930Sjtl */ 1292147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1293147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval; 1294290930Sjtl pp->pp_pmcs[ri].pp_pmcval = pm->pm_sc.pm_reloadcount; 1295147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1296147191Sjkoshy } else { 1297147191Sjkoshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1298147191Sjkoshy ("[pmc,%d] illegal mode=%d", __LINE__, 1299147191Sjkoshy PMC_TO_MODE(pm))); 1300147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1301147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1302147191Sjkoshy pm->pm_gv.pm_savedvalue; 1303147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1304147191Sjkoshy } 1305145256Sjkoshy 1306282658Sjhb PMCDBG3(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1307145256Sjkoshy 1308184802Sjkoshy pcd->pcd_write_pmc(cpu, adjri, newvalue); 1309290811Sjtl 1310290811Sjtl /* If a sampling mode PMC, reset stalled state. */ 1311290811Sjtl if (PMC_TO_MODE(pm) == PMC_MODE_TS) 1312290811Sjtl CPU_CLR_ATOMIC(cpu, &pm->pm_stalled); 1313290811Sjtl 1314290811Sjtl /* Indicate that we desire this to run. */ 1315290811Sjtl CPU_SET_ATOMIC(cpu, &pm->pm_cpustate); 1316290811Sjtl 1317290811Sjtl /* Start the PMC. */ 1318184802Sjkoshy pcd->pcd_start_pmc(cpu, adjri); 1319147191Sjkoshy } 1320145256Sjkoshy 1321147191Sjkoshy /* 1322147191Sjkoshy * perform any other architecture/cpu dependent thread 1323147191Sjkoshy * switch-in actions. 1324147191Sjkoshy */ 1325145256Sjkoshy 1326147191Sjkoshy (void) (*md->pmd_switch_in)(pc, pp); 1327145256Sjkoshy 1328147191Sjkoshy critical_exit(); 1329145256Sjkoshy 1330147191Sjkoshy} 1331145256Sjkoshy 1332147191Sjkoshy/* 1333147191Sjkoshy * Thread context switch OUT. 1334147191Sjkoshy */ 1335145256Sjkoshy 1336147191Sjkoshystatic void 1337147191Sjkoshypmc_process_csw_out(struct thread *td) 1338147191Sjkoshy{ 1339147191Sjkoshy int cpu; 1340184802Sjkoshy int64_t tmp; 1341147191Sjkoshy struct pmc *pm; 1342147191Sjkoshy struct proc *p; 1343184802Sjkoshy enum pmc_mode mode; 1344147191Sjkoshy struct pmc_cpu *pc; 1345184802Sjkoshy pmc_value_t newvalue; 1346184802Sjkoshy unsigned int adjri, ri; 1347147191Sjkoshy struct pmc_process *pp; 1348184802Sjkoshy struct pmc_classdep *pcd; 1349145256Sjkoshy 1350184802Sjkoshy 1351147191Sjkoshy /* 1352147191Sjkoshy * Locate our process descriptor; this may be NULL if 1353147191Sjkoshy * this process is exiting and we have already removed 1354147191Sjkoshy * the process from the target process table. 1355147191Sjkoshy * 1356147191Sjkoshy * Note that due to kernel preemption, multiple 1357147191Sjkoshy * context switches may happen while the process is 1358147191Sjkoshy * exiting. 1359147191Sjkoshy * 1360147191Sjkoshy * Note also that if the target process cannot be 1361147191Sjkoshy * found we still need to deconfigure any PMCs that 1362147191Sjkoshy * are currently running on hardware. 1363147191Sjkoshy */ 1364145256Sjkoshy 1365147191Sjkoshy p = td->td_proc; 1366147191Sjkoshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1367145256Sjkoshy 1368147191Sjkoshy /* 1369147191Sjkoshy * save PMCs 1370147191Sjkoshy */ 1371145256Sjkoshy 1372147191Sjkoshy critical_enter(); 1373145774Sjkoshy 1374147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1375145256Sjkoshy 1376282658Sjhb PMCDBG5(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1377147191Sjkoshy p->p_pid, p->p_comm, pp); 1378145615Sjkoshy 1379183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1380298931Spfg ("[pmc,%d weird CPU id %d", __LINE__, cpu)); 1381145615Sjkoshy 1382147191Sjkoshy pc = pmc_pcpu[cpu]; 1383145615Sjkoshy 1384147191Sjkoshy /* 1385147191Sjkoshy * When a PMC gets unlinked from a target PMC, it will 1386147191Sjkoshy * be removed from the target's pp_pmc[] array. 1387147191Sjkoshy * 1388147191Sjkoshy * However, on a MP system, the target could have been 1389147191Sjkoshy * executing on another CPU at the time of the unlink. 1390147191Sjkoshy * So, at context switch OUT time, we need to look at 1391147191Sjkoshy * the hardware to determine if a PMC is scheduled on 1392147191Sjkoshy * it. 1393147191Sjkoshy */ 1394145256Sjkoshy 1395147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1396145256Sjkoshy 1397184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1398184802Sjkoshy pm = NULL; 1399184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 1400145256Sjkoshy 1401147191Sjkoshy if (pm == NULL) /* nothing at this row index */ 1402147191Sjkoshy continue; 1403145256Sjkoshy 1404147191Sjkoshy mode = PMC_TO_MODE(pm); 1405147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1406147191Sjkoshy continue; /* not a process virtual PMC */ 1407145774Sjkoshy 1408147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1409147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1410147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1411145256Sjkoshy 1412290811Sjtl /* 1413290811Sjtl * Change desired state, and then stop if not stalled. 1414290811Sjtl * This two-step dance should avoid race conditions where 1415290811Sjtl * an interrupt re-enables the PMC after this code has 1416290811Sjtl * already checked the pm_stalled flag. 1417290811Sjtl */ 1418290811Sjtl CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate); 1419290811Sjtl if (!CPU_ISSET(cpu, &pm->pm_stalled)) 1420184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 1421147191Sjkoshy 1422147191Sjkoshy /* reduce this PMC's runcount */ 1423208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount, 1); 1424147191Sjkoshy 1425145256Sjkoshy /* 1426147191Sjkoshy * If this PMC is associated with this process, 1427147191Sjkoshy * save the reading. 1428145256Sjkoshy */ 1429145256Sjkoshy 1430310064Savg if (pm->pm_state != PMC_STATE_DELETED && pp != NULL && 1431310064Savg pp->pp_pmcs[ri].pp_pmc != NULL) { 1432147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1433147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1434147191Sjkoshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1435147191Sjkoshy 1436147191Sjkoshy KASSERT(pp->pp_refcnt > 0, 1437147191Sjkoshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1438147191Sjkoshy pp->pp_refcnt)); 1439147191Sjkoshy 1440184802Sjkoshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 1441147191Sjkoshy 1442147191Sjkoshy if (mode == PMC_MODE_TS) { 1443290930Sjtl PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (samp)", 1444290930Sjtl cpu, ri, PMC_PCPU_SAVED(cpu,ri) - newvalue); 1445147191Sjkoshy 1446147191Sjkoshy /* 1447147191Sjkoshy * For sampling process-virtual PMCs, 1448290930Sjtl * newvalue is the number of events to be seen 1449290930Sjtl * until the next sampling interrupt. 1450290930Sjtl * We can just add the events left from this 1451290930Sjtl * invocation to the counter, then adjust 1452290930Sjtl * in case we overflow our range. 1453290930Sjtl * 1454290930Sjtl * (Recall that we reload the counter every 1455290930Sjtl * time we use it.) 1456147191Sjkoshy */ 1457147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1458290930Sjtl 1459290930Sjtl pp->pp_pmcs[ri].pp_pmcval += newvalue; 1460290930Sjtl if (pp->pp_pmcs[ri].pp_pmcval > 1461290930Sjtl pm->pm_sc.pm_reloadcount) 1462290930Sjtl pp->pp_pmcs[ri].pp_pmcval -= 1463147191Sjkoshy pm->pm_sc.pm_reloadcount; 1464290930Sjtl KASSERT(pp->pp_pmcs[ri].pp_pmcval > 0 && 1465290930Sjtl pp->pp_pmcs[ri].pp_pmcval <= 1466290930Sjtl pm->pm_sc.pm_reloadcount, 1467290930Sjtl ("[pmc,%d] pp_pmcval outside of expected " 1468290930Sjtl "range cpu=%d ri=%d pp_pmcval=%jx " 1469290930Sjtl "pm_reloadcount=%jx", __LINE__, cpu, ri, 1470290930Sjtl pp->pp_pmcs[ri].pp_pmcval, 1471290930Sjtl pm->pm_sc.pm_reloadcount)); 1472147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1473147191Sjkoshy 1474147191Sjkoshy } else { 1475290930Sjtl tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1476147191Sjkoshy 1477290930Sjtl PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (count)", 1478290930Sjtl cpu, ri, tmp); 1479290930Sjtl 1480147191Sjkoshy /* 1481147191Sjkoshy * For counting process-virtual PMCs, 1482147191Sjkoshy * we expect the count to be 1483147191Sjkoshy * increasing monotonically, modulo a 64 1484147191Sjkoshy * bit wraparound. 1485147191Sjkoshy */ 1486295558Skib KASSERT(tmp >= 0, 1487147191Sjkoshy ("[pmc,%d] negative increment cpu=%d " 1488147191Sjkoshy "ri=%d newvalue=%jx saved=%jx " 1489147191Sjkoshy "incr=%jx", __LINE__, cpu, ri, 1490147191Sjkoshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1491147191Sjkoshy 1492147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1493147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 1494147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1495147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1496147191Sjkoshy 1497147191Sjkoshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1498147191Sjkoshy pmclog_process_proccsw(pm, pp, tmp); 1499147191Sjkoshy } 1500145256Sjkoshy } 1501145256Sjkoshy 1502147191Sjkoshy /* mark hardware as free */ 1503184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 1504145256Sjkoshy } 1505145256Sjkoshy 1506145256Sjkoshy /* 1507147191Sjkoshy * perform any other architecture/cpu dependent thread 1508147191Sjkoshy * switch out functions. 1509147191Sjkoshy */ 1510147191Sjkoshy 1511147191Sjkoshy (void) (*md->pmd_switch_out)(pc, pp); 1512147191Sjkoshy 1513147191Sjkoshy critical_exit(); 1514147191Sjkoshy} 1515147191Sjkoshy 1516147191Sjkoshy/* 1517157144Sjkoshy * A mapping change for a process. 1518157144Sjkoshy */ 1519157144Sjkoshy 1520157144Sjkoshystatic void 1521157144Sjkoshypmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm) 1522157144Sjkoshy{ 1523157144Sjkoshy int ri; 1524157144Sjkoshy pid_t pid; 1525157144Sjkoshy char *fullpath, *freepath; 1526157144Sjkoshy const struct pmc *pm; 1527157144Sjkoshy struct pmc_owner *po; 1528157144Sjkoshy const struct pmc_process *pp; 1529157144Sjkoshy 1530157144Sjkoshy freepath = fullpath = NULL; 1531157144Sjkoshy pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath); 1532157144Sjkoshy 1533157144Sjkoshy pid = td->td_proc->p_pid; 1534157144Sjkoshy 1535157144Sjkoshy /* Inform owners of all system-wide sampling PMCs. */ 1536157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1537157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1538157144Sjkoshy pmclog_process_map_in(po, pid, pkm->pm_address, fullpath); 1539157144Sjkoshy 1540157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1541157144Sjkoshy goto done; 1542157144Sjkoshy 1543157144Sjkoshy /* 1544157144Sjkoshy * Inform sampling PMC owners tracking this process. 1545157144Sjkoshy */ 1546157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1547157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1548157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1549157144Sjkoshy pmclog_process_map_in(pm->pm_owner, 1550157144Sjkoshy pid, pkm->pm_address, fullpath); 1551157144Sjkoshy 1552157144Sjkoshy done: 1553157144Sjkoshy if (freepath) 1554184205Sdes free(freepath, M_TEMP); 1555157144Sjkoshy} 1556157144Sjkoshy 1557157144Sjkoshy 1558157144Sjkoshy/* 1559157144Sjkoshy * Log an munmap request. 1560157144Sjkoshy */ 1561157144Sjkoshy 1562157144Sjkoshystatic void 1563157144Sjkoshypmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm) 1564157144Sjkoshy{ 1565157144Sjkoshy int ri; 1566157144Sjkoshy pid_t pid; 1567157144Sjkoshy struct pmc_owner *po; 1568157144Sjkoshy const struct pmc *pm; 1569157144Sjkoshy const struct pmc_process *pp; 1570157144Sjkoshy 1571157144Sjkoshy pid = td->td_proc->p_pid; 1572157144Sjkoshy 1573157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1574157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1575157144Sjkoshy pmclog_process_map_out(po, pid, pkm->pm_address, 1576157144Sjkoshy pkm->pm_address + pkm->pm_size); 1577157144Sjkoshy 1578157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1579157144Sjkoshy return; 1580157144Sjkoshy 1581157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1582157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1583157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1584157651Sjkoshy pmclog_process_map_out(pm->pm_owner, pid, 1585157651Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1586157144Sjkoshy} 1587157144Sjkoshy 1588157144Sjkoshy/* 1589174395Sjkoshy * Log mapping information about the kernel. 1590174395Sjkoshy */ 1591174395Sjkoshy 1592174395Sjkoshystatic void 1593174395Sjkoshypmc_log_kernel_mappings(struct pmc *pm) 1594174395Sjkoshy{ 1595174395Sjkoshy struct pmc_owner *po; 1596174395Sjkoshy struct pmckern_map_in *km, *kmbase; 1597174395Sjkoshy 1598174395Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1599174395Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 1600174395Sjkoshy ("[pmc,%d] non-sampling PMC (%p) desires mapping information", 1601174395Sjkoshy __LINE__, (void *) pm)); 1602174395Sjkoshy 1603174395Sjkoshy po = pm->pm_owner; 1604174395Sjkoshy 1605174395Sjkoshy if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE) 1606174395Sjkoshy return; 1607174395Sjkoshy 1608174395Sjkoshy /* 1609174395Sjkoshy * Log the current set of kernel modules. 1610174395Sjkoshy */ 1611174395Sjkoshy kmbase = linker_hwpmc_list_objects(); 1612174395Sjkoshy for (km = kmbase; km->pm_file != NULL; km++) { 1613282658Sjhb PMCDBG2(LOG,REG,1,"%s %p", (char *) km->pm_file, 1614174395Sjkoshy (void *) km->pm_address); 1615174395Sjkoshy pmclog_process_map_in(po, (pid_t) -1, km->pm_address, 1616174395Sjkoshy km->pm_file); 1617174395Sjkoshy } 1618184205Sdes free(kmbase, M_LINKER); 1619174395Sjkoshy 1620174395Sjkoshy po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE; 1621174395Sjkoshy} 1622174395Sjkoshy 1623174395Sjkoshy/* 1624174395Sjkoshy * Log the mappings for a single process. 1625174395Sjkoshy */ 1626174395Sjkoshy 1627174395Sjkoshystatic void 1628174395Sjkoshypmc_log_process_mappings(struct pmc_owner *po, struct proc *p) 1629174395Sjkoshy{ 1630201021Sjkoshy vm_map_t map; 1631201021Sjkoshy struct vnode *vp; 1632201021Sjkoshy struct vmspace *vm; 1633201021Sjkoshy vm_map_entry_t entry; 1634201021Sjkoshy vm_offset_t last_end; 1635201021Sjkoshy u_int last_timestamp; 1636201021Sjkoshy struct vnode *last_vp; 1637201021Sjkoshy vm_offset_t start_addr; 1638201021Sjkoshy vm_object_t obj, lobj, tobj; 1639201021Sjkoshy char *fullpath, *freepath; 1640201021Sjkoshy 1641201021Sjkoshy last_vp = NULL; 1642201021Sjkoshy last_end = (vm_offset_t) 0; 1643201021Sjkoshy fullpath = freepath = NULL; 1644201021Sjkoshy 1645201021Sjkoshy if ((vm = vmspace_acquire_ref(p)) == NULL) 1646201021Sjkoshy return; 1647201021Sjkoshy 1648201021Sjkoshy map = &vm->vm_map; 1649201021Sjkoshy vm_map_lock_read(map); 1650201021Sjkoshy 1651201021Sjkoshy for (entry = map->header.next; entry != &map->header; entry = entry->next) { 1652201021Sjkoshy 1653201021Sjkoshy if (entry == NULL) { 1654282658Sjhb PMCDBG2(LOG,OPS,2, "hwpmc: vm_map entry unexpectedly " 1655201021Sjkoshy "NULL! pid=%d vm_map=%p\n", p->p_pid, map); 1656201021Sjkoshy break; 1657201021Sjkoshy } 1658201021Sjkoshy 1659201021Sjkoshy /* 1660201021Sjkoshy * We only care about executable map entries. 1661201021Sjkoshy */ 1662201021Sjkoshy if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 1663201021Sjkoshy !(entry->protection & VM_PROT_EXECUTE) || 1664201021Sjkoshy (entry->object.vm_object == NULL)) { 1665201021Sjkoshy continue; 1666201021Sjkoshy } 1667201021Sjkoshy 1668201021Sjkoshy obj = entry->object.vm_object; 1669251423Salc VM_OBJECT_RLOCK(obj); 1670201021Sjkoshy 1671201021Sjkoshy /* 1672201021Sjkoshy * Walk the backing_object list to find the base 1673201021Sjkoshy * (non-shadowed) vm_object. 1674201021Sjkoshy */ 1675201021Sjkoshy for (lobj = tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 1676201021Sjkoshy if (tobj != obj) 1677251423Salc VM_OBJECT_RLOCK(tobj); 1678201021Sjkoshy if (lobj != obj) 1679251423Salc VM_OBJECT_RUNLOCK(lobj); 1680201021Sjkoshy lobj = tobj; 1681201021Sjkoshy } 1682201021Sjkoshy 1683201021Sjkoshy /* 1684201021Sjkoshy * At this point lobj is the base vm_object and it is locked. 1685201021Sjkoshy */ 1686201021Sjkoshy if (lobj == NULL) { 1687282658Sjhb PMCDBG3(LOG,OPS,2, "hwpmc: lobj unexpectedly NULL! pid=%d " 1688201021Sjkoshy "vm_map=%p vm_obj=%p\n", p->p_pid, map, obj); 1689251423Salc VM_OBJECT_RUNLOCK(obj); 1690201021Sjkoshy continue; 1691201021Sjkoshy } 1692201021Sjkoshy 1693283924Svangyzen vp = vm_object_vnode(lobj); 1694283924Svangyzen if (vp == NULL) { 1695201021Sjkoshy if (lobj != obj) 1696251423Salc VM_OBJECT_RUNLOCK(lobj); 1697251423Salc VM_OBJECT_RUNLOCK(obj); 1698201021Sjkoshy continue; 1699201021Sjkoshy } 1700201021Sjkoshy 1701201021Sjkoshy /* 1702201021Sjkoshy * Skip contiguous regions that point to the same 1703201021Sjkoshy * vnode, so we don't emit redundant MAP-IN 1704201021Sjkoshy * directives. 1705201021Sjkoshy */ 1706283924Svangyzen if (entry->start == last_end && vp == last_vp) { 1707201021Sjkoshy last_end = entry->end; 1708201021Sjkoshy if (lobj != obj) 1709251423Salc VM_OBJECT_RUNLOCK(lobj); 1710251423Salc VM_OBJECT_RUNLOCK(obj); 1711201021Sjkoshy continue; 1712201021Sjkoshy } 1713201021Sjkoshy 1714201021Sjkoshy /* 1715201021Sjkoshy * We don't want to keep the proc's vm_map or this 1716201021Sjkoshy * vm_object locked while we walk the pathname, since 1717201021Sjkoshy * vn_fullpath() can sleep. However, if we drop the 1718201021Sjkoshy * lock, it's possible for concurrent activity to 1719201021Sjkoshy * modify the vm_map list. To protect against this, 1720201021Sjkoshy * we save the vm_map timestamp before we release the 1721201021Sjkoshy * lock, and check it after we reacquire the lock 1722201021Sjkoshy * below. 1723201021Sjkoshy */ 1724201021Sjkoshy start_addr = entry->start; 1725201021Sjkoshy last_end = entry->end; 1726201021Sjkoshy last_timestamp = map->timestamp; 1727201021Sjkoshy vm_map_unlock_read(map); 1728201021Sjkoshy 1729201021Sjkoshy vref(vp); 1730201021Sjkoshy if (lobj != obj) 1731251423Salc VM_OBJECT_RUNLOCK(lobj); 1732201021Sjkoshy 1733251423Salc VM_OBJECT_RUNLOCK(obj); 1734201021Sjkoshy 1735201021Sjkoshy freepath = NULL; 1736201021Sjkoshy pmc_getfilename(vp, &fullpath, &freepath); 1737201021Sjkoshy last_vp = vp; 1738201151Sjkoshy 1739201021Sjkoshy vrele(vp); 1740201151Sjkoshy 1741201021Sjkoshy vp = NULL; 1742201021Sjkoshy pmclog_process_map_in(po, p->p_pid, start_addr, fullpath); 1743201021Sjkoshy if (freepath) 1744201021Sjkoshy free(freepath, M_TEMP); 1745201021Sjkoshy 1746201021Sjkoshy vm_map_lock_read(map); 1747201021Sjkoshy 1748201021Sjkoshy /* 1749201021Sjkoshy * If our saved timestamp doesn't match, this means 1750201021Sjkoshy * that the vm_map was modified out from under us and 1751201021Sjkoshy * we can't trust our current "entry" pointer. Do a 1752201021Sjkoshy * new lookup for this entry. If there is no entry 1753201021Sjkoshy * for this address range, vm_map_lookup_entry() will 1754201021Sjkoshy * return the previous one, so we always want to go to 1755201021Sjkoshy * entry->next on the next loop iteration. 1756201021Sjkoshy * 1757201021Sjkoshy * There is an edge condition here that can occur if 1758201021Sjkoshy * there is no entry at or before this address. In 1759201021Sjkoshy * this situation, vm_map_lookup_entry returns 1760201021Sjkoshy * &map->header, which would cause our loop to abort 1761201021Sjkoshy * without processing the rest of the map. However, 1762201021Sjkoshy * in practice this will never happen for process 1763201021Sjkoshy * vm_map. This is because the executable's text 1764201021Sjkoshy * segment is the first mapping in the proc's address 1765201021Sjkoshy * space, and this mapping is never removed until the 1766201021Sjkoshy * process exits, so there will always be a non-header 1767201021Sjkoshy * entry at or before the requested address for 1768201021Sjkoshy * vm_map_lookup_entry to return. 1769201021Sjkoshy */ 1770201021Sjkoshy if (map->timestamp != last_timestamp) 1771201021Sjkoshy vm_map_lookup_entry(map, last_end - 1, &entry); 1772201021Sjkoshy } 1773201021Sjkoshy 1774201021Sjkoshy vm_map_unlock_read(map); 1775201021Sjkoshy vmspace_free(vm); 1776201021Sjkoshy return; 1777174395Sjkoshy} 1778174395Sjkoshy 1779174395Sjkoshy/* 1780174395Sjkoshy * Log mappings for all processes in the system. 1781174395Sjkoshy */ 1782174395Sjkoshy 1783174395Sjkoshystatic void 1784174395Sjkoshypmc_log_all_process_mappings(struct pmc_owner *po) 1785174395Sjkoshy{ 1786174395Sjkoshy struct proc *p, *top; 1787174395Sjkoshy 1788174395Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1789174395Sjkoshy 1790174395Sjkoshy if ((p = pfind(1)) == NULL) 1791174395Sjkoshy panic("[pmc,%d] Cannot find init", __LINE__); 1792174395Sjkoshy 1793174395Sjkoshy PROC_UNLOCK(p); 1794174395Sjkoshy 1795174395Sjkoshy sx_slock(&proctree_lock); 1796174395Sjkoshy 1797174395Sjkoshy top = p; 1798174395Sjkoshy 1799174395Sjkoshy for (;;) { 1800174395Sjkoshy pmc_log_process_mappings(po, p); 1801174395Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1802174395Sjkoshy p = LIST_FIRST(&p->p_children); 1803174395Sjkoshy else for (;;) { 1804174395Sjkoshy if (p == top) 1805174395Sjkoshy goto done; 1806174395Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1807174395Sjkoshy p = LIST_NEXT(p, p_sibling); 1808174395Sjkoshy break; 1809174395Sjkoshy } 1810174395Sjkoshy p = p->p_pptr; 1811174395Sjkoshy } 1812174395Sjkoshy } 1813174395Sjkoshy done: 1814174395Sjkoshy sx_sunlock(&proctree_lock); 1815174395Sjkoshy} 1816174395Sjkoshy 1817174395Sjkoshy/* 1818147191Sjkoshy * The 'hook' invoked from the kernel proper 1819147191Sjkoshy */ 1820147191Sjkoshy 1821147191Sjkoshy 1822282641Sjhb#ifdef HWPMC_DEBUG 1823147191Sjkoshyconst char *pmc_hooknames[] = { 1824157144Sjkoshy /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */ 1825147191Sjkoshy "", 1826147191Sjkoshy "EXEC", 1827147191Sjkoshy "CSW-IN", 1828147191Sjkoshy "CSW-OUT", 1829157144Sjkoshy "SAMPLE", 1830254813Smarkj "UNUSED1", 1831254813Smarkj "UNUSED2", 1832157144Sjkoshy "MMAP", 1833174395Sjkoshy "MUNMAP", 1834233628Sfabient "CALLCHAIN-NMI", 1835233628Sfabient "CALLCHAIN-SOFT", 1836233628Sfabient "SOFTSAMPLING" 1837147191Sjkoshy}; 1838147191Sjkoshy#endif 1839147191Sjkoshy 1840147191Sjkoshystatic int 1841147191Sjkoshypmc_hook_handler(struct thread *td, int function, void *arg) 1842147191Sjkoshy{ 1843147191Sjkoshy 1844282658Sjhb PMCDBG4(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1845147191Sjkoshy pmc_hooknames[function], arg); 1846147191Sjkoshy 1847147191Sjkoshy switch (function) 1848147191Sjkoshy { 1849147191Sjkoshy 1850147191Sjkoshy /* 1851145256Sjkoshy * Process exec() 1852145256Sjkoshy */ 1853145256Sjkoshy 1854145256Sjkoshy case PMC_FN_PROCESS_EXEC: 1855145256Sjkoshy { 1856147191Sjkoshy char *fullpath, *freepath; 1857145256Sjkoshy unsigned int ri; 1858147191Sjkoshy int is_using_hwpmcs; 1859145256Sjkoshy struct pmc *pm; 1860145256Sjkoshy struct proc *p; 1861145256Sjkoshy struct pmc_owner *po; 1862145256Sjkoshy struct pmc_process *pp; 1863147708Sjkoshy struct pmckern_procexec *pk; 1864145256Sjkoshy 1865145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1866145256Sjkoshy 1867147191Sjkoshy p = td->td_proc; 1868147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1869147191Sjkoshy 1870147708Sjkoshy pk = (struct pmckern_procexec *) arg; 1871147708Sjkoshy 1872147191Sjkoshy /* Inform owners of SS mode PMCs of the exec event. */ 1873147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1874147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1875147708Sjkoshy pmclog_process_procexec(po, PMC_ID_INVALID, 1876147708Sjkoshy p->p_pid, pk->pm_entryaddr, fullpath); 1877147191Sjkoshy 1878147191Sjkoshy PROC_LOCK(p); 1879147191Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1880147191Sjkoshy PROC_UNLOCK(p); 1881147191Sjkoshy 1882147191Sjkoshy if (!is_using_hwpmcs) { 1883147191Sjkoshy if (freepath) 1884184205Sdes free(freepath, M_TEMP); 1885147191Sjkoshy break; 1886147191Sjkoshy } 1887147191Sjkoshy 1888145256Sjkoshy /* 1889145256Sjkoshy * PMCs are not inherited across an exec(): remove any 1890145256Sjkoshy * PMCs that this process is the owner of. 1891145256Sjkoshy */ 1892145256Sjkoshy 1893145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1894145256Sjkoshy pmc_remove_owner(po); 1895147191Sjkoshy pmc_destroy_owner_descriptor(po); 1896145256Sjkoshy } 1897145256Sjkoshy 1898145256Sjkoshy /* 1899154483Sjkoshy * If the process being exec'ed is not the target of any 1900154483Sjkoshy * PMC, we are done. 1901145256Sjkoshy */ 1902154483Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 1903154483Sjkoshy if (freepath) 1904184205Sdes free(freepath, M_TEMP); 1905145256Sjkoshy break; 1906154483Sjkoshy } 1907145256Sjkoshy 1908147191Sjkoshy /* 1909147191Sjkoshy * Log the exec event to all monitoring owners. Skip 1910298931Spfg * owners who have already received the event because 1911154483Sjkoshy * they had system sampling PMCs active. 1912147191Sjkoshy */ 1913147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1914147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1915147191Sjkoshy po = pm->pm_owner; 1916147191Sjkoshy if (po->po_sscount == 0 && 1917147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 1918147708Sjkoshy pmclog_process_procexec(po, pm->pm_id, 1919147708Sjkoshy p->p_pid, pk->pm_entryaddr, 1920147191Sjkoshy fullpath); 1921147191Sjkoshy } 1922147191Sjkoshy 1923147191Sjkoshy if (freepath) 1924184205Sdes free(freepath, M_TEMP); 1925147191Sjkoshy 1926145256Sjkoshy 1927282658Sjhb PMCDBG4(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 1928147708Sjkoshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1929145256Sjkoshy 1930147708Sjkoshy if (pk->pm_credentialschanged == 0) /* no change */ 1931145256Sjkoshy break; 1932145256Sjkoshy 1933145256Sjkoshy /* 1934145256Sjkoshy * If the newly exec()'ed process has a different credential 1935145256Sjkoshy * than before, allow it to be the target of a PMC only if 1936298931Spfg * the PMC's owner has sufficient privilege. 1937145256Sjkoshy */ 1938145256Sjkoshy 1939145256Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1940145256Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1941145256Sjkoshy if (pmc_can_attach(pm, td->td_proc) != 0) 1942145256Sjkoshy pmc_detach_one_process(td->td_proc, 1943145256Sjkoshy pm, PMC_FLAG_NONE); 1944145256Sjkoshy 1945198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1946145256Sjkoshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1947145256Sjkoshy pp->pp_refcnt, pp)); 1948145256Sjkoshy 1949145256Sjkoshy /* 1950145256Sjkoshy * If this process is no longer the target of any 1951145256Sjkoshy * PMCs, we can remove the process entry and free 1952145256Sjkoshy * up space. 1953145256Sjkoshy */ 1954145256Sjkoshy 1955145256Sjkoshy if (pp->pp_refcnt == 0) { 1956145256Sjkoshy pmc_remove_process_descriptor(pp); 1957184205Sdes free(pp, M_PMC); 1958147191Sjkoshy break; 1959145256Sjkoshy } 1960145256Sjkoshy 1961145256Sjkoshy } 1962145256Sjkoshy break; 1963145256Sjkoshy 1964145256Sjkoshy case PMC_FN_CSW_IN: 1965147191Sjkoshy pmc_process_csw_in(td); 1966147191Sjkoshy break; 1967145256Sjkoshy 1968147191Sjkoshy case PMC_FN_CSW_OUT: 1969147191Sjkoshy pmc_process_csw_out(td); 1970147191Sjkoshy break; 1971145256Sjkoshy 1972145256Sjkoshy /* 1973147191Sjkoshy * Process accumulated PC samples. 1974147191Sjkoshy * 1975147191Sjkoshy * This function is expected to be called by hardclock() for 1976147191Sjkoshy * each CPU that has accumulated PC samples. 1977147191Sjkoshy * 1978147191Sjkoshy * This function is to be executed on the CPU whose samples 1979147191Sjkoshy * are being processed. 1980145256Sjkoshy */ 1981147191Sjkoshy case PMC_FN_DO_SAMPLES: 1982145256Sjkoshy 1983145256Sjkoshy /* 1984147191Sjkoshy * Clear the cpu specific bit in the CPU mask before 1985147191Sjkoshy * do the rest of the processing. If the NMI handler 1986147191Sjkoshy * gets invoked after the "atomic_clear_int()" call 1987147191Sjkoshy * below but before "pmc_process_samples()" gets 1988147191Sjkoshy * around to processing the interrupt, then we will 1989147191Sjkoshy * come back here at the next hardclock() tick (and 1990147191Sjkoshy * may find nothing to do if "pmc_process_samples()" 1991147191Sjkoshy * had already processed the interrupt). We don't 1992147191Sjkoshy * lose the interrupt sample. 1993145256Sjkoshy */ 1994222813Sattilio CPU_CLR_ATOMIC(PCPU_GET(cpuid), &pmc_cpumask); 1995233628Sfabient pmc_process_samples(PCPU_GET(cpuid), PMC_HR); 1996233628Sfabient pmc_process_samples(PCPU_GET(cpuid), PMC_SR); 1997147191Sjkoshy break; 1998145256Sjkoshy 1999157144Sjkoshy case PMC_FN_MMAP: 2000157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 2001157144Sjkoshy pmc_process_mmap(td, (struct pmckern_map_in *) arg); 2002157144Sjkoshy break; 2003157144Sjkoshy 2004157144Sjkoshy case PMC_FN_MUNMAP: 2005157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 2006157144Sjkoshy pmc_process_munmap(td, (struct pmckern_map_out *) arg); 2007157144Sjkoshy break; 2008157144Sjkoshy 2009174395Sjkoshy case PMC_FN_USER_CALLCHAIN: 2010174395Sjkoshy /* 2011174395Sjkoshy * Record a call chain. 2012174395Sjkoshy */ 2013186037Sjkoshy KASSERT(td == curthread, ("[pmc,%d] td != curthread", 2014186037Sjkoshy __LINE__)); 2015233628Sfabient 2016233628Sfabient pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_HR, 2017174395Sjkoshy (struct trapframe *) arg); 2018186037Sjkoshy td->td_pflags &= ~TDP_CALLCHAIN; 2019174395Sjkoshy break; 2020174395Sjkoshy 2021233628Sfabient case PMC_FN_USER_CALLCHAIN_SOFT: 2022233628Sfabient /* 2023233628Sfabient * Record a call chain. 2024233628Sfabient */ 2025233628Sfabient KASSERT(td == curthread, ("[pmc,%d] td != curthread", 2026233628Sfabient __LINE__)); 2027233628Sfabient pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_SR, 2028233628Sfabient (struct trapframe *) arg); 2029233628Sfabient td->td_pflags &= ~TDP_CALLCHAIN; 2030233628Sfabient break; 2031233628Sfabient 2032233628Sfabient case PMC_FN_SOFT_SAMPLING: 2033233628Sfabient /* 2034233628Sfabient * Call soft PMC sampling intr. 2035233628Sfabient */ 2036233628Sfabient pmc_soft_intr((struct pmckern_soft *) arg); 2037233628Sfabient break; 2038233628Sfabient 2039145256Sjkoshy default: 2040282641Sjhb#ifdef HWPMC_DEBUG 2041145256Sjkoshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 2042145256Sjkoshy#endif 2043145256Sjkoshy break; 2044145256Sjkoshy 2045145256Sjkoshy } 2046145256Sjkoshy 2047145256Sjkoshy return 0; 2048145256Sjkoshy} 2049145256Sjkoshy 2050145256Sjkoshy/* 2051145256Sjkoshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 2052145256Sjkoshy */ 2053145256Sjkoshy 2054145256Sjkoshystatic struct pmc_owner * 2055145256Sjkoshypmc_allocate_owner_descriptor(struct proc *p) 2056145256Sjkoshy{ 2057145256Sjkoshy uint32_t hindex; 2058145256Sjkoshy struct pmc_owner *po; 2059145256Sjkoshy struct pmc_ownerhash *poh; 2060145256Sjkoshy 2061145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2062145256Sjkoshy poh = &pmc_ownerhash[hindex]; 2063145256Sjkoshy 2064145256Sjkoshy /* allocate space for N pointers and one descriptor struct */ 2065184802Sjkoshy po = malloc(sizeof(struct pmc_owner), M_PMC, M_WAITOK|M_ZERO); 2066145256Sjkoshy po->po_owner = p; 2067145256Sjkoshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 2068145256Sjkoshy 2069147191Sjkoshy TAILQ_INIT(&po->po_logbuffers); 2070168856Sjkoshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN); 2071147191Sjkoshy 2072282658Sjhb PMCDBG4(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 2073145256Sjkoshy p, p->p_pid, p->p_comm, po); 2074145256Sjkoshy 2075145256Sjkoshy return po; 2076145256Sjkoshy} 2077145256Sjkoshy 2078147191Sjkoshystatic void 2079147191Sjkoshypmc_destroy_owner_descriptor(struct pmc_owner *po) 2080147191Sjkoshy{ 2081147191Sjkoshy 2082282658Sjhb PMCDBG4(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 2083147191Sjkoshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 2084147191Sjkoshy 2085147191Sjkoshy mtx_destroy(&po->po_mtx); 2086184205Sdes free(po, M_PMC); 2087147191Sjkoshy} 2088147191Sjkoshy 2089145256Sjkoshy/* 2090145256Sjkoshy * find the descriptor corresponding to process 'p', adding or removing it 2091145256Sjkoshy * as specified by 'mode'. 2092145256Sjkoshy */ 2093145256Sjkoshy 2094145256Sjkoshystatic struct pmc_process * 2095145256Sjkoshypmc_find_process_descriptor(struct proc *p, uint32_t mode) 2096145256Sjkoshy{ 2097145256Sjkoshy uint32_t hindex; 2098145256Sjkoshy struct pmc_process *pp, *ppnew; 2099145256Sjkoshy struct pmc_processhash *pph; 2100145256Sjkoshy 2101145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 2102145256Sjkoshy pph = &pmc_processhash[hindex]; 2103145256Sjkoshy 2104145256Sjkoshy ppnew = NULL; 2105145256Sjkoshy 2106145256Sjkoshy /* 2107145256Sjkoshy * Pre-allocate memory in the FIND_ALLOCATE case since we 2108145256Sjkoshy * cannot call malloc(9) once we hold a spin lock. 2109145256Sjkoshy */ 2110184802Sjkoshy if (mode & PMC_FLAG_ALLOCATE) 2111184214Sdes ppnew = malloc(sizeof(struct pmc_process) + md->pmd_npmc * 2112184802Sjkoshy sizeof(struct pmc_targetstate), M_PMC, M_WAITOK|M_ZERO); 2113145256Sjkoshy 2114145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 2115145256Sjkoshy LIST_FOREACH(pp, pph, pp_next) 2116145256Sjkoshy if (pp->pp_proc == p) 2117145256Sjkoshy break; 2118145256Sjkoshy 2119145256Sjkoshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 2120145256Sjkoshy LIST_REMOVE(pp, pp_next); 2121145256Sjkoshy 2122145256Sjkoshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 2123145256Sjkoshy ppnew != NULL) { 2124145256Sjkoshy ppnew->pp_proc = p; 2125145256Sjkoshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 2126145256Sjkoshy pp = ppnew; 2127145256Sjkoshy ppnew = NULL; 2128145256Sjkoshy } 2129145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 2130145256Sjkoshy 2131145256Sjkoshy if (pp != NULL && ppnew != NULL) 2132184205Sdes free(ppnew, M_PMC); 2133145256Sjkoshy 2134145256Sjkoshy return pp; 2135145256Sjkoshy} 2136145256Sjkoshy 2137145256Sjkoshy/* 2138145256Sjkoshy * remove a process descriptor from the process hash table. 2139145256Sjkoshy */ 2140145256Sjkoshy 2141145256Sjkoshystatic void 2142145256Sjkoshypmc_remove_process_descriptor(struct pmc_process *pp) 2143145256Sjkoshy{ 2144145256Sjkoshy KASSERT(pp->pp_refcnt == 0, 2145145256Sjkoshy ("[pmc,%d] Removing process descriptor %p with count %d", 2146145256Sjkoshy __LINE__, pp, pp->pp_refcnt)); 2147145256Sjkoshy 2148145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 2149145256Sjkoshy LIST_REMOVE(pp, pp_next); 2150145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 2151145256Sjkoshy} 2152145256Sjkoshy 2153145256Sjkoshy 2154145256Sjkoshy/* 2155145256Sjkoshy * find an owner descriptor corresponding to proc 'p' 2156145256Sjkoshy */ 2157145256Sjkoshy 2158145256Sjkoshystatic struct pmc_owner * 2159145256Sjkoshypmc_find_owner_descriptor(struct proc *p) 2160145256Sjkoshy{ 2161145256Sjkoshy uint32_t hindex; 2162145256Sjkoshy struct pmc_owner *po; 2163145256Sjkoshy struct pmc_ownerhash *poh; 2164145256Sjkoshy 2165145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2166145256Sjkoshy poh = &pmc_ownerhash[hindex]; 2167145256Sjkoshy 2168145256Sjkoshy po = NULL; 2169145256Sjkoshy LIST_FOREACH(po, poh, po_next) 2170145256Sjkoshy if (po->po_owner == p) 2171145256Sjkoshy break; 2172145256Sjkoshy 2173282658Sjhb PMCDBG5(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 2174145256Sjkoshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 2175145256Sjkoshy 2176145256Sjkoshy return po; 2177145256Sjkoshy} 2178145256Sjkoshy 2179145256Sjkoshy/* 2180145256Sjkoshy * pmc_allocate_pmc_descriptor 2181145256Sjkoshy * 2182145256Sjkoshy * Allocate a pmc descriptor and initialize its 2183145256Sjkoshy * fields. 2184145256Sjkoshy */ 2185145256Sjkoshy 2186145256Sjkoshystatic struct pmc * 2187145256Sjkoshypmc_allocate_pmc_descriptor(void) 2188145256Sjkoshy{ 2189145256Sjkoshy struct pmc *pmc; 2190145256Sjkoshy 2191184802Sjkoshy pmc = malloc(sizeof(struct pmc), M_PMC, M_WAITOK|M_ZERO); 2192145256Sjkoshy 2193282658Sjhb PMCDBG1(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 2194145256Sjkoshy 2195145256Sjkoshy return pmc; 2196145256Sjkoshy} 2197145256Sjkoshy 2198145256Sjkoshy/* 2199145256Sjkoshy * Destroy a pmc descriptor. 2200145256Sjkoshy */ 2201145256Sjkoshy 2202145256Sjkoshystatic void 2203145256Sjkoshypmc_destroy_pmc_descriptor(struct pmc *pm) 2204145256Sjkoshy{ 2205145256Sjkoshy 2206145256Sjkoshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 2207145256Sjkoshy pm->pm_state == PMC_STATE_FREE, 2208145256Sjkoshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 2209145256Sjkoshy KASSERT(LIST_EMPTY(&pm->pm_targets), 2210145256Sjkoshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 2211145256Sjkoshy KASSERT(pm->pm_owner == NULL, 2212145256Sjkoshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 2213145256Sjkoshy KASSERT(pm->pm_runcount == 0, 2214145256Sjkoshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 2215145256Sjkoshy pm->pm_runcount)); 2216273236Smarkj 2217273236Smarkj free(pm, M_PMC); 2218145256Sjkoshy} 2219145256Sjkoshy 2220147191Sjkoshystatic void 2221147191Sjkoshypmc_wait_for_pmc_idle(struct pmc *pm) 2222147191Sjkoshy{ 2223282641Sjhb#ifdef HWPMC_DEBUG 2224147191Sjkoshy volatile int maxloop; 2225147191Sjkoshy 2226183266Sjkoshy maxloop = 100 * pmc_cpu_max(); 2227147191Sjkoshy#endif 2228147191Sjkoshy /* 2229147191Sjkoshy * Loop (with a forced context switch) till the PMC's runcount 2230147191Sjkoshy * comes down to zero. 2231147191Sjkoshy */ 2232147191Sjkoshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 2233282641Sjhb#ifdef HWPMC_DEBUG 2234147191Sjkoshy maxloop--; 2235147191Sjkoshy KASSERT(maxloop > 0, 2236147191Sjkoshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 2237147191Sjkoshy "pmc to be free", __LINE__, 2238147191Sjkoshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 2239147191Sjkoshy#endif 2240147191Sjkoshy pmc_force_context_switch(); 2241147191Sjkoshy } 2242147191Sjkoshy} 2243147191Sjkoshy 2244145256Sjkoshy/* 2245145256Sjkoshy * This function does the following things: 2246145256Sjkoshy * 2247145256Sjkoshy * - detaches the PMC from hardware 2248145256Sjkoshy * - unlinks all target threads that were attached to it 2249145256Sjkoshy * - removes the PMC from its owner's list 2250273236Smarkj * - destroys the PMC private mutex 2251145256Sjkoshy * 2252273236Smarkj * Once this function completes, the given pmc pointer can be freed by 2253273236Smarkj * calling pmc_destroy_pmc_descriptor(). 2254145256Sjkoshy */ 2255145256Sjkoshy 2256145256Sjkoshystatic void 2257145256Sjkoshypmc_release_pmc_descriptor(struct pmc *pm) 2258145256Sjkoshy{ 2259145774Sjkoshy enum pmc_mode mode; 2260145256Sjkoshy struct pmc_hw *phw; 2261184802Sjkoshy u_int adjri, ri, cpu; 2262147191Sjkoshy struct pmc_owner *po; 2263184802Sjkoshy struct pmc_binding pb; 2264145256Sjkoshy struct pmc_process *pp; 2265184802Sjkoshy struct pmc_classdep *pcd; 2266145256Sjkoshy struct pmc_target *ptgt, *tmp; 2267145256Sjkoshy 2268145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2269145256Sjkoshy 2270145256Sjkoshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 2271145256Sjkoshy 2272145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2273184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2274145774Sjkoshy mode = PMC_TO_MODE(pm); 2275145256Sjkoshy 2276282658Sjhb PMCDBG3(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 2277145774Sjkoshy mode); 2278145256Sjkoshy 2279145256Sjkoshy /* 2280145256Sjkoshy * First, we take the PMC off hardware. 2281145256Sjkoshy */ 2282145301Simp cpu = 0; 2283145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2284145256Sjkoshy 2285145256Sjkoshy /* 2286145256Sjkoshy * A system mode PMC runs on a specific CPU. Switch 2287145256Sjkoshy * to this CPU and turn hardware off. 2288145256Sjkoshy */ 2289145256Sjkoshy pmc_save_cpu_binding(&pb); 2290145256Sjkoshy 2291145774Sjkoshy cpu = PMC_TO_CPU(pm); 2292145256Sjkoshy 2293147191Sjkoshy pmc_select_cpu(cpu); 2294145256Sjkoshy 2295147191Sjkoshy /* switch off non-stalled CPUs */ 2296290811Sjtl CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate); 2297147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 2298290811Sjtl !CPU_ISSET(cpu, &pm->pm_stalled)) { 2299145256Sjkoshy 2300145256Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 2301145256Sjkoshy 2302145256Sjkoshy KASSERT(phw->phw_pmc == pm, 2303145256Sjkoshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 2304145256Sjkoshy __LINE__, ri, phw->phw_pmc, pm)); 2305282658Sjhb PMCDBG2(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 2306145256Sjkoshy 2307145256Sjkoshy critical_enter(); 2308184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 2309145256Sjkoshy critical_exit(); 2310145256Sjkoshy } 2311145256Sjkoshy 2312282658Sjhb PMCDBG2(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 2313145256Sjkoshy 2314145256Sjkoshy critical_enter(); 2315184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 2316145256Sjkoshy critical_exit(); 2317145256Sjkoshy 2318147191Sjkoshy /* adjust the global and process count of SS mode PMCs */ 2319147191Sjkoshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 2320147191Sjkoshy po = pm->pm_owner; 2321147191Sjkoshy po->po_sscount--; 2322147191Sjkoshy if (po->po_sscount == 0) { 2323147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2324147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2325147191Sjkoshy } 2326147191Sjkoshy } 2327147191Sjkoshy 2328145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2329145256Sjkoshy 2330145256Sjkoshy pmc_restore_cpu_binding(&pb); 2331145256Sjkoshy 2332147191Sjkoshy /* 2333147191Sjkoshy * We could have references to this PMC structure in 2334147191Sjkoshy * the per-cpu sample queues. Wait for the queue to 2335147191Sjkoshy * drain. 2336147191Sjkoshy */ 2337147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2338147191Sjkoshy 2339145774Sjkoshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 2340145256Sjkoshy 2341145256Sjkoshy /* 2342145256Sjkoshy * A virtual PMC could be running on multiple CPUs at 2343145256Sjkoshy * a given instant. 2344145256Sjkoshy * 2345145256Sjkoshy * By marking its state as DELETED, we ensure that 2346145256Sjkoshy * this PMC is never further scheduled on hardware. 2347145256Sjkoshy * 2348145256Sjkoshy * Then we wait till all CPUs are done with this PMC. 2349145256Sjkoshy */ 2350145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2351145256Sjkoshy 2352145256Sjkoshy 2353147191Sjkoshy /* Wait for the PMCs runcount to come to zero. */ 2354147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2355145256Sjkoshy 2356145256Sjkoshy /* 2357145256Sjkoshy * At this point the PMC is off all CPUs and cannot be 2358145256Sjkoshy * freshly scheduled onto a CPU. It is now safe to 2359145256Sjkoshy * unlink all targets from this PMC. If a 2360145256Sjkoshy * process-record's refcount falls to zero, we remove 2361145256Sjkoshy * it from the hash table. The module-wide SX lock 2362145256Sjkoshy * protects us from races. 2363145256Sjkoshy */ 2364145256Sjkoshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 2365145256Sjkoshy pp = ptgt->pt_process; 2366145256Sjkoshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 2367145256Sjkoshy 2368282658Sjhb PMCDBG1(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 2369145256Sjkoshy 2370145256Sjkoshy /* 2371145256Sjkoshy * If the target process record shows that no 2372145256Sjkoshy * PMCs are attached to it, reclaim its space. 2373145256Sjkoshy */ 2374145256Sjkoshy 2375145256Sjkoshy if (pp->pp_refcnt == 0) { 2376145256Sjkoshy pmc_remove_process_descriptor(pp); 2377184205Sdes free(pp, M_PMC); 2378145256Sjkoshy } 2379145256Sjkoshy } 2380145256Sjkoshy 2381145256Sjkoshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 2382145256Sjkoshy 2383145256Sjkoshy } 2384145256Sjkoshy 2385145256Sjkoshy /* 2386145256Sjkoshy * Release any MD resources 2387145256Sjkoshy */ 2388184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pm); 2389145256Sjkoshy 2390145256Sjkoshy /* 2391145256Sjkoshy * Update row disposition 2392145256Sjkoshy */ 2393145256Sjkoshy 2394145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 2395145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2396145256Sjkoshy else 2397145256Sjkoshy PMC_UNMARK_ROW_THREAD(ri); 2398145256Sjkoshy 2399145256Sjkoshy /* unlink from the owner's list */ 2400147191Sjkoshy if (pm->pm_owner) { 2401147191Sjkoshy LIST_REMOVE(pm, pm_next); 2402147191Sjkoshy pm->pm_owner = NULL; 2403147191Sjkoshy } 2404145256Sjkoshy} 2405145256Sjkoshy 2406145256Sjkoshy/* 2407145256Sjkoshy * Register an owner and a pmc. 2408145256Sjkoshy */ 2409145256Sjkoshy 2410145256Sjkoshystatic int 2411145256Sjkoshypmc_register_owner(struct proc *p, struct pmc *pmc) 2412145256Sjkoshy{ 2413145256Sjkoshy struct pmc_owner *po; 2414145256Sjkoshy 2415145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2416145256Sjkoshy 2417145774Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2418147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 2419145256Sjkoshy return ENOMEM; 2420145256Sjkoshy 2421145256Sjkoshy KASSERT(pmc->pm_owner == NULL, 2422145256Sjkoshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 2423145256Sjkoshy pmc->pm_owner = po; 2424145256Sjkoshy 2425147191Sjkoshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 2426145256Sjkoshy 2427145256Sjkoshy PROC_LOCK(p); 2428145256Sjkoshy p->p_flag |= P_HWPMC; 2429145256Sjkoshy PROC_UNLOCK(p); 2430145256Sjkoshy 2431147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 2432147191Sjkoshy pmclog_process_pmcallocate(pmc); 2433145256Sjkoshy 2434282658Sjhb PMCDBG2(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2435147191Sjkoshy po, pmc); 2436147191Sjkoshy 2437145256Sjkoshy return 0; 2438145256Sjkoshy} 2439145256Sjkoshy 2440145256Sjkoshy/* 2441145256Sjkoshy * Return the current row disposition: 2442145256Sjkoshy * == 0 => FREE 2443145256Sjkoshy * > 0 => PROCESS MODE 2444145256Sjkoshy * < 0 => SYSTEM MODE 2445145256Sjkoshy */ 2446145256Sjkoshy 2447145256Sjkoshyint 2448145256Sjkoshypmc_getrowdisp(int ri) 2449145256Sjkoshy{ 2450145256Sjkoshy return pmc_pmcdisp[ri]; 2451145256Sjkoshy} 2452145256Sjkoshy 2453145256Sjkoshy/* 2454145256Sjkoshy * Check if a PMC at row index 'ri' can be allocated to the current 2455145256Sjkoshy * process. 2456145256Sjkoshy * 2457145256Sjkoshy * Allocation can fail if: 2458145256Sjkoshy * - the current process is already being profiled by a PMC at index 'ri', 2459145256Sjkoshy * attached to it via OP_PMCATTACH. 2460145256Sjkoshy * - the current process has already allocated a PMC at index 'ri' 2461145256Sjkoshy * via OP_ALLOCATE. 2462145256Sjkoshy */ 2463145256Sjkoshy 2464145256Sjkoshystatic int 2465145774Sjkoshypmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2466145256Sjkoshy{ 2467145774Sjkoshy enum pmc_mode mode; 2468145774Sjkoshy struct pmc *pm; 2469145256Sjkoshy struct pmc_owner *po; 2470145256Sjkoshy struct pmc_process *pp; 2471145256Sjkoshy 2472282658Sjhb PMCDBG5(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2473145774Sjkoshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2474145256Sjkoshy 2475145774Sjkoshy /* 2476145774Sjkoshy * We shouldn't have already allocated a process-mode PMC at 2477145774Sjkoshy * row index 'ri'. 2478145774Sjkoshy * 2479145774Sjkoshy * We shouldn't have allocated a system-wide PMC on the same 2480145774Sjkoshy * CPU and same RI. 2481145774Sjkoshy */ 2482145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2483147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2484145774Sjkoshy if (PMC_TO_ROWINDEX(pm) == ri) { 2485145774Sjkoshy mode = PMC_TO_MODE(pm); 2486145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) 2487145774Sjkoshy return EEXIST; 2488145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && 2489145774Sjkoshy (int) PMC_TO_CPU(pm) == cpu) 2490145774Sjkoshy return EEXIST; 2491145774Sjkoshy } 2492145774Sjkoshy } 2493145256Sjkoshy 2494145774Sjkoshy /* 2495145774Sjkoshy * We also shouldn't be the target of any PMC at this index 2496145774Sjkoshy * since otherwise a PMC_ATTACH to ourselves will fail. 2497145774Sjkoshy */ 2498145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2499145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc) 2500145256Sjkoshy return EEXIST; 2501145256Sjkoshy 2502282658Sjhb PMCDBG4(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2503145256Sjkoshy p, p->p_pid, p->p_comm, ri); 2504145256Sjkoshy 2505145256Sjkoshy return 0; 2506145256Sjkoshy} 2507145256Sjkoshy 2508145256Sjkoshy/* 2509145256Sjkoshy * Check if a given PMC at row index 'ri' can be currently used in 2510145256Sjkoshy * mode 'mode'. 2511145256Sjkoshy */ 2512145256Sjkoshy 2513145256Sjkoshystatic int 2514145256Sjkoshypmc_can_allocate_row(int ri, enum pmc_mode mode) 2515145256Sjkoshy{ 2516145256Sjkoshy enum pmc_disp disp; 2517145256Sjkoshy 2518145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2519145256Sjkoshy 2520282658Sjhb PMCDBG2(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2521145256Sjkoshy 2522145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2523145256Sjkoshy disp = PMC_DISP_STANDALONE; 2524145256Sjkoshy else 2525145256Sjkoshy disp = PMC_DISP_THREAD; 2526145256Sjkoshy 2527145256Sjkoshy /* 2528145256Sjkoshy * check disposition for PMC row 'ri': 2529145256Sjkoshy * 2530145256Sjkoshy * Expected disposition Row-disposition Result 2531145256Sjkoshy * 2532145256Sjkoshy * STANDALONE STANDALONE or FREE proceed 2533145256Sjkoshy * STANDALONE THREAD fail 2534145256Sjkoshy * THREAD THREAD or FREE proceed 2535145256Sjkoshy * THREAD STANDALONE fail 2536145256Sjkoshy */ 2537145256Sjkoshy 2538145256Sjkoshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2539145256Sjkoshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2540145256Sjkoshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2541145256Sjkoshy return EBUSY; 2542145256Sjkoshy 2543145256Sjkoshy /* 2544145256Sjkoshy * All OK 2545145256Sjkoshy */ 2546145256Sjkoshy 2547282658Sjhb PMCDBG2(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2548145256Sjkoshy 2549145256Sjkoshy return 0; 2550145256Sjkoshy 2551145256Sjkoshy} 2552145256Sjkoshy 2553145256Sjkoshy/* 2554145774Sjkoshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2555145256Sjkoshy */ 2556145256Sjkoshy 2557145256Sjkoshystatic struct pmc * 2558145256Sjkoshypmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2559145256Sjkoshy{ 2560147191Sjkoshy struct pmc *pm; 2561145256Sjkoshy 2562145774Sjkoshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2563145774Sjkoshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2564145774Sjkoshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2565145256Sjkoshy 2566147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2567147191Sjkoshy if (pm->pm_id == pmcid) 2568147191Sjkoshy return pm; 2569145256Sjkoshy 2570145256Sjkoshy return NULL; 2571145256Sjkoshy} 2572145256Sjkoshy 2573145256Sjkoshystatic int 2574145256Sjkoshypmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2575145256Sjkoshy{ 2576145256Sjkoshy 2577287115Sbz struct pmc *pm, *opm; 2578145256Sjkoshy struct pmc_owner *po; 2579287115Sbz struct pmc_process *pp; 2580145256Sjkoshy 2581282658Sjhb PMCDBG1(PMC,FND,1, "find-pmc id=%d", pmcid); 2582325756Skib if (PMC_ID_TO_ROWINDEX(pmcid) >= md->pmd_npmc) 2583325756Skib return (EINVAL); 2584145256Sjkoshy 2585287115Sbz if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) { 2586287115Sbz /* 2587287115Sbz * In case of PMC_F_DESCENDANTS child processes we will not find 2588287115Sbz * the current process in the owners hash list. Find the owner 2589287115Sbz * process first and from there lookup the po. 2590287115Sbz */ 2591287115Sbz if ((pp = pmc_find_process_descriptor(curthread->td_proc, 2592287115Sbz PMC_FLAG_NONE)) == NULL) { 2593287115Sbz return ESRCH; 2594287115Sbz } else { 2595287115Sbz opm = pp->pp_pmcs[PMC_ID_TO_ROWINDEX(pmcid)].pp_pmc; 2596287115Sbz if (opm == NULL) 2597287115Sbz return ESRCH; 2598287115Sbz if ((opm->pm_flags & (PMC_F_ATTACHED_TO_OWNER| 2599287115Sbz PMC_F_DESCENDANTS)) != (PMC_F_ATTACHED_TO_OWNER| 2600287115Sbz PMC_F_DESCENDANTS)) 2601287115Sbz return ESRCH; 2602287115Sbz po = opm->pm_owner; 2603287115Sbz } 2604287115Sbz } 2605145256Sjkoshy 2606145256Sjkoshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2607145256Sjkoshy return EINVAL; 2608145256Sjkoshy 2609282658Sjhb PMCDBG2(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2610145256Sjkoshy 2611145256Sjkoshy *pmc = pm; 2612145256Sjkoshy return 0; 2613145256Sjkoshy} 2614145256Sjkoshy 2615145256Sjkoshy/* 2616145256Sjkoshy * Start a PMC. 2617145256Sjkoshy */ 2618145256Sjkoshy 2619145256Sjkoshystatic int 2620145256Sjkoshypmc_start(struct pmc *pm) 2621145256Sjkoshy{ 2622145774Sjkoshy enum pmc_mode mode; 2623147191Sjkoshy struct pmc_owner *po; 2624145256Sjkoshy struct pmc_binding pb; 2625184802Sjkoshy struct pmc_classdep *pcd; 2626184802Sjkoshy int adjri, error, cpu, ri; 2627145256Sjkoshy 2628145256Sjkoshy KASSERT(pm != NULL, 2629145256Sjkoshy ("[pmc,%d] null pm", __LINE__)); 2630145256Sjkoshy 2631145774Sjkoshy mode = PMC_TO_MODE(pm); 2632145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2633184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2634184802Sjkoshy 2635145774Sjkoshy error = 0; 2636145256Sjkoshy 2637282658Sjhb PMCDBG3(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2638145774Sjkoshy 2639147191Sjkoshy po = pm->pm_owner; 2640145256Sjkoshy 2641174395Sjkoshy /* 2642174395Sjkoshy * Disallow PMCSTART if a logfile is required but has not been 2643174395Sjkoshy * configured yet. 2644174395Sjkoshy */ 2645174395Sjkoshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2646174395Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2647184802Sjkoshy return (EDOOFUS); /* programming error */ 2648174395Sjkoshy 2649174395Sjkoshy /* 2650174395Sjkoshy * If this is a sampling mode PMC, log mapping information for 2651174395Sjkoshy * the kernel modules that are currently loaded. 2652174395Sjkoshy */ 2653174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2654174395Sjkoshy pmc_log_kernel_mappings(pm); 2655174395Sjkoshy 2656145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2657145256Sjkoshy 2658145256Sjkoshy /* 2659147191Sjkoshy * If a PMCATTACH has never been done on this PMC, 2660147191Sjkoshy * attach it to its owner process. 2661145256Sjkoshy */ 2662145256Sjkoshy 2663145256Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 2664147191Sjkoshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2665147191Sjkoshy pmc_attach_process(po->po_owner, pm); 2666145256Sjkoshy 2667145774Sjkoshy /* 2668147191Sjkoshy * If the PMC is attached to its owner, then force a context 2669147191Sjkoshy * switch to ensure that the MD state gets set correctly. 2670145256Sjkoshy */ 2671145256Sjkoshy 2672147191Sjkoshy if (error == 0) { 2673147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2674147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2675147191Sjkoshy pmc_force_context_switch(); 2676147191Sjkoshy } 2677147191Sjkoshy 2678184802Sjkoshy return (error); 2679147191Sjkoshy } 2680145256Sjkoshy 2681147191Sjkoshy 2682147191Sjkoshy /* 2683147191Sjkoshy * A system-wide PMC. 2684174395Sjkoshy * 2685147191Sjkoshy * Add the owner to the global list if this is a system-wide 2686147191Sjkoshy * sampling PMC. 2687147191Sjkoshy */ 2688147191Sjkoshy 2689147191Sjkoshy if (mode == PMC_MODE_SS) { 2690147191Sjkoshy if (po->po_sscount == 0) { 2691147191Sjkoshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2692147191Sjkoshy atomic_add_rel_int(&pmc_ss_count, 1); 2693282658Sjhb PMCDBG1(PMC,OPS,1, "po=%p in global list", po); 2694147191Sjkoshy } 2695147191Sjkoshy po->po_sscount++; 2696145256Sjkoshy 2697207484Srstone /* 2698207484Srstone * Log mapping information for all existing processes in the 2699207484Srstone * system. Subsequent mappings are logged as they happen; 2700207484Srstone * see pmc_process_mmap(). 2701207484Srstone */ 2702207484Srstone if (po->po_logprocmaps == 0) { 2703207484Srstone pmc_log_all_process_mappings(po); 2704207484Srstone po->po_logprocmaps = 1; 2705207484Srstone } 2706201021Sjkoshy } 2707157144Sjkoshy 2708145256Sjkoshy /* 2709147191Sjkoshy * Move to the CPU associated with this 2710145256Sjkoshy * PMC, and start the hardware. 2711145256Sjkoshy */ 2712145256Sjkoshy 2713145256Sjkoshy pmc_save_cpu_binding(&pb); 2714145256Sjkoshy 2715145774Sjkoshy cpu = PMC_TO_CPU(pm); 2716145256Sjkoshy 2717183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2718184802Sjkoshy return (ENXIO); 2719145256Sjkoshy 2720145256Sjkoshy pmc_select_cpu(cpu); 2721145256Sjkoshy 2722145256Sjkoshy /* 2723145256Sjkoshy * global PMCs are configured at allocation time 2724145256Sjkoshy * so write out the initial value and start the PMC. 2725145256Sjkoshy */ 2726145256Sjkoshy 2727147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2728147191Sjkoshy 2729145774Sjkoshy critical_enter(); 2730184802Sjkoshy if ((error = pcd->pcd_write_pmc(cpu, adjri, 2731145774Sjkoshy PMC_IS_SAMPLING_MODE(mode) ? 2732145256Sjkoshy pm->pm_sc.pm_reloadcount : 2733290811Sjtl pm->pm_sc.pm_initial)) == 0) { 2734290811Sjtl /* If a sampling mode PMC, reset stalled state. */ 2735290811Sjtl if (PMC_IS_SAMPLING_MODE(mode)) 2736290811Sjtl CPU_CLR_ATOMIC(cpu, &pm->pm_stalled); 2737290811Sjtl 2738290811Sjtl /* Indicate that we desire this to run. Start it. */ 2739290811Sjtl CPU_SET_ATOMIC(cpu, &pm->pm_cpustate); 2740184802Sjkoshy error = pcd->pcd_start_pmc(cpu, adjri); 2741290811Sjtl } 2742145774Sjkoshy critical_exit(); 2743145256Sjkoshy 2744145256Sjkoshy pmc_restore_cpu_binding(&pb); 2745145256Sjkoshy 2746184802Sjkoshy return (error); 2747145256Sjkoshy} 2748145256Sjkoshy 2749145256Sjkoshy/* 2750145256Sjkoshy * Stop a PMC. 2751145256Sjkoshy */ 2752145256Sjkoshy 2753145256Sjkoshystatic int 2754145256Sjkoshypmc_stop(struct pmc *pm) 2755145256Sjkoshy{ 2756147191Sjkoshy struct pmc_owner *po; 2757145256Sjkoshy struct pmc_binding pb; 2758184802Sjkoshy struct pmc_classdep *pcd; 2759184802Sjkoshy int adjri, cpu, error, ri; 2760145256Sjkoshy 2761145256Sjkoshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2762145256Sjkoshy 2763282658Sjhb PMCDBG3(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2764145774Sjkoshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2765145256Sjkoshy 2766145256Sjkoshy pm->pm_state = PMC_STATE_STOPPED; 2767145256Sjkoshy 2768145256Sjkoshy /* 2769145256Sjkoshy * If the PMC is a virtual mode one, changing the state to 2770145256Sjkoshy * non-RUNNING is enough to ensure that the PMC never gets 2771145256Sjkoshy * scheduled. 2772145256Sjkoshy * 2773145256Sjkoshy * If this PMC is current running on a CPU, then it will 2774145256Sjkoshy * handled correctly at the time its target process is context 2775145256Sjkoshy * switched out. 2776145256Sjkoshy */ 2777145256Sjkoshy 2778145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2779145256Sjkoshy return 0; 2780145256Sjkoshy 2781145256Sjkoshy /* 2782145256Sjkoshy * A system-mode PMC. Move to the CPU associated with 2783145256Sjkoshy * this PMC, and stop the hardware. We update the 2784145256Sjkoshy * 'initial count' so that a subsequent PMCSTART will 2785145256Sjkoshy * resume counting from the current hardware count. 2786145256Sjkoshy */ 2787145256Sjkoshy 2788145256Sjkoshy pmc_save_cpu_binding(&pb); 2789145256Sjkoshy 2790145774Sjkoshy cpu = PMC_TO_CPU(pm); 2791145256Sjkoshy 2792183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 2793145774Sjkoshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2794145774Sjkoshy 2795183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2796145256Sjkoshy return ENXIO; 2797145256Sjkoshy 2798145256Sjkoshy pmc_select_cpu(cpu); 2799145256Sjkoshy 2800145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2801184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2802145256Sjkoshy 2803290811Sjtl CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate); 2804145774Sjkoshy critical_enter(); 2805184802Sjkoshy if ((error = pcd->pcd_stop_pmc(cpu, adjri)) == 0) 2806184802Sjkoshy error = pcd->pcd_read_pmc(cpu, adjri, &pm->pm_sc.pm_initial); 2807145774Sjkoshy critical_exit(); 2808145774Sjkoshy 2809145256Sjkoshy pmc_restore_cpu_binding(&pb); 2810145256Sjkoshy 2811147191Sjkoshy po = pm->pm_owner; 2812147191Sjkoshy 2813147191Sjkoshy /* remove this owner from the global list of SS PMC owners */ 2814147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2815147191Sjkoshy po->po_sscount--; 2816147191Sjkoshy if (po->po_sscount == 0) { 2817147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2818147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2819282658Sjhb PMCDBG1(PMC,OPS,2,"po=%p removed from global list", po); 2820147191Sjkoshy } 2821147191Sjkoshy } 2822147191Sjkoshy 2823184802Sjkoshy return (error); 2824145256Sjkoshy} 2825145256Sjkoshy 2826145256Sjkoshy 2827282641Sjhb#ifdef HWPMC_DEBUG 2828145256Sjkoshystatic const char *pmc_op_to_name[] = { 2829145256Sjkoshy#undef __PMC_OP 2830145256Sjkoshy#define __PMC_OP(N, D) #N , 2831145256Sjkoshy __PMC_OPS() 2832145256Sjkoshy NULL 2833145256Sjkoshy}; 2834145256Sjkoshy#endif 2835145256Sjkoshy 2836145256Sjkoshy/* 2837145256Sjkoshy * The syscall interface 2838145256Sjkoshy */ 2839145256Sjkoshy 2840145256Sjkoshy#define PMC_GET_SX_XLOCK(...) do { \ 2841145256Sjkoshy sx_xlock(&pmc_sx); \ 2842145256Sjkoshy if (pmc_hook == NULL) { \ 2843145256Sjkoshy sx_xunlock(&pmc_sx); \ 2844145256Sjkoshy return __VA_ARGS__; \ 2845145256Sjkoshy } \ 2846145256Sjkoshy} while (0) 2847145256Sjkoshy 2848145256Sjkoshy#define PMC_DOWNGRADE_SX() do { \ 2849145256Sjkoshy sx_downgrade(&pmc_sx); \ 2850145256Sjkoshy is_sx_downgraded = 1; \ 2851145256Sjkoshy} while (0) 2852145256Sjkoshy 2853145256Sjkoshystatic int 2854145256Sjkoshypmc_syscall_handler(struct thread *td, void *syscall_args) 2855145256Sjkoshy{ 2856325551Skib int error, is_sx_downgraded, op; 2857145256Sjkoshy struct pmc_syscall_args *c; 2858325551Skib void *pmclog_proc_handle; 2859145256Sjkoshy void *arg; 2860145256Sjkoshy 2861325551Skib c = (struct pmc_syscall_args *)syscall_args; 2862325551Skib op = c->pmop_code; 2863325551Skib arg = c->pmop_data; 2864325551Skib if (op == PMC_OP_CONFIGURELOG) { 2865325551Skib /* 2866325551Skib * We cannot create the logging process inside 2867325551Skib * pmclog_configure_log() because there is a LOR 2868325551Skib * between pmc_sx and process structure locks. 2869325551Skib * Instead, pre-create the process and ignite the loop 2870325551Skib * if everything is fine, otherwise direct the process 2871325551Skib * to exit. 2872325551Skib */ 2873325551Skib error = pmclog_proc_create(td, &pmclog_proc_handle); 2874325551Skib if (error != 0) 2875325551Skib goto done_syscall; 2876325551Skib } 2877325551Skib 2878145256Sjkoshy PMC_GET_SX_XLOCK(ENOSYS); 2879145256Sjkoshy is_sx_downgraded = 0; 2880145256Sjkoshy 2881282658Sjhb PMCDBG3(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2882145256Sjkoshy pmc_op_to_name[op], arg); 2883145256Sjkoshy 2884145256Sjkoshy error = 0; 2885145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2886145256Sjkoshy 2887325547Skib switch (op) { 2888145256Sjkoshy 2889145256Sjkoshy 2890145256Sjkoshy /* 2891145256Sjkoshy * Configure a log file. 2892145256Sjkoshy * 2893145256Sjkoshy * XXX This OP will be reworked. 2894145256Sjkoshy */ 2895145256Sjkoshy 2896145256Sjkoshy case PMC_OP_CONFIGURELOG: 2897145256Sjkoshy { 2898157144Sjkoshy struct proc *p; 2899156466Sjkoshy struct pmc *pm; 2900145256Sjkoshy struct pmc_owner *po; 2901145256Sjkoshy struct pmc_op_configurelog cl; 2902145256Sjkoshy 2903325551Skib if ((error = copyin(arg, &cl, sizeof(cl))) != 0) { 2904325551Skib pmclog_proc_ignite(pmclog_proc_handle, NULL); 2905145256Sjkoshy break; 2906325551Skib } 2907145256Sjkoshy 2908145256Sjkoshy /* mark this process as owning a log file */ 2909145256Sjkoshy p = td->td_proc; 2910145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2911147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2912325551Skib pmclog_proc_ignite(pmclog_proc_handle, NULL); 2913147191Sjkoshy error = ENOMEM; 2914147191Sjkoshy break; 2915147191Sjkoshy } 2916145256Sjkoshy 2917147191Sjkoshy /* 2918147191Sjkoshy * If a valid fd was passed in, try to configure that, 2919147191Sjkoshy * otherwise if 'fd' was less than zero and there was 2920147191Sjkoshy * a log file configured, flush its buffers and 2921147191Sjkoshy * de-configure it. 2922147191Sjkoshy */ 2923195005Sattilio if (cl.pm_logfd >= 0) { 2924185363Sjkoshy error = pmclog_configure_log(md, po, cl.pm_logfd); 2925325551Skib pmclog_proc_ignite(pmclog_proc_handle, error == 0 ? 2926325551Skib po : NULL); 2927195005Sattilio } else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2928325551Skib pmclog_proc_ignite(pmclog_proc_handle, NULL); 2929226514Sfabient error = pmclog_close(po); 2930156466Sjkoshy if (error == 0) { 2931156466Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2932156834Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 2933156834Sjkoshy pm->pm_state == PMC_STATE_RUNNING) 2934156466Sjkoshy pmc_stop(pm); 2935147191Sjkoshy error = pmclog_deconfigure_log(po); 2936156466Sjkoshy } 2937325551Skib } else { 2938325551Skib pmclog_proc_ignite(pmclog_proc_handle, NULL); 2939147191Sjkoshy error = EINVAL; 2940325551Skib } 2941147191Sjkoshy } 2942147191Sjkoshy break; 2943147191Sjkoshy 2944147191Sjkoshy /* 2945147191Sjkoshy * Flush a log file. 2946147191Sjkoshy */ 2947147191Sjkoshy 2948147191Sjkoshy case PMC_OP_FLUSHLOG: 2949147191Sjkoshy { 2950147191Sjkoshy struct pmc_owner *po; 2951147191Sjkoshy 2952147191Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2953147191Sjkoshy 2954147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2955147191Sjkoshy error = EINVAL; 2956145256Sjkoshy break; 2957147191Sjkoshy } 2958145256Sjkoshy 2959147191Sjkoshy error = pmclog_flush(po); 2960145256Sjkoshy } 2961145256Sjkoshy break; 2962145256Sjkoshy 2963145256Sjkoshy /* 2964226514Sfabient * Close a log file. 2965226514Sfabient */ 2966226514Sfabient 2967226514Sfabient case PMC_OP_CLOSELOG: 2968226514Sfabient { 2969226514Sfabient struct pmc_owner *po; 2970226514Sfabient 2971226514Sfabient sx_assert(&pmc_sx, SX_XLOCKED); 2972226514Sfabient 2973226514Sfabient if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2974226514Sfabient error = EINVAL; 2975226514Sfabient break; 2976226514Sfabient } 2977226514Sfabient 2978226514Sfabient error = pmclog_close(po); 2979226514Sfabient } 2980226514Sfabient break; 2981226514Sfabient 2982226514Sfabient /* 2983145256Sjkoshy * Retrieve hardware configuration. 2984145256Sjkoshy */ 2985145256Sjkoshy 2986145256Sjkoshy case PMC_OP_GETCPUINFO: /* CPU information */ 2987145256Sjkoshy { 2988145256Sjkoshy struct pmc_op_getcpuinfo gci; 2989184802Sjkoshy struct pmc_classinfo *pci; 2990184802Sjkoshy struct pmc_classdep *pcd; 2991184802Sjkoshy int cl; 2992145256Sjkoshy 2993343350Smarkj memset(&gci, 0, sizeof(gci)); 2994145256Sjkoshy gci.pm_cputype = md->pmd_cputype; 2995183266Sjkoshy gci.pm_ncpu = pmc_cpu_max(); 2996145256Sjkoshy gci.pm_npmc = md->pmd_npmc; 2997145256Sjkoshy gci.pm_nclass = md->pmd_nclass; 2998184802Sjkoshy pci = gci.pm_classes; 2999184802Sjkoshy pcd = md->pmd_classdep; 3000184802Sjkoshy for (cl = 0; cl < md->pmd_nclass; cl++, pci++, pcd++) { 3001184802Sjkoshy pci->pm_caps = pcd->pcd_caps; 3002184802Sjkoshy pci->pm_class = pcd->pcd_class; 3003184802Sjkoshy pci->pm_width = pcd->pcd_width; 3004184802Sjkoshy pci->pm_num = pcd->pcd_num; 3005184802Sjkoshy } 3006145256Sjkoshy error = copyout(&gci, arg, sizeof(gci)); 3007145256Sjkoshy } 3008145256Sjkoshy break; 3009145256Sjkoshy 3010233628Sfabient /* 3011233628Sfabient * Retrieve soft events list. 3012233628Sfabient */ 3013233628Sfabient case PMC_OP_GETDYNEVENTINFO: 3014233628Sfabient { 3015233628Sfabient enum pmc_class cl; 3016233628Sfabient enum pmc_event ev; 3017233628Sfabient struct pmc_op_getdyneventinfo *gei; 3018233628Sfabient struct pmc_dyn_event_descr dev; 3019233628Sfabient struct pmc_soft *ps; 3020233628Sfabient uint32_t nevent; 3021145256Sjkoshy 3022233628Sfabient sx_assert(&pmc_sx, SX_LOCKED); 3023233628Sfabient 3024233628Sfabient gei = (struct pmc_op_getdyneventinfo *) arg; 3025233628Sfabient 3026233628Sfabient if ((error = copyin(&gei->pm_class, &cl, sizeof(cl))) != 0) 3027233628Sfabient break; 3028233628Sfabient 3029233628Sfabient /* Only SOFT class is dynamic. */ 3030233628Sfabient if (cl != PMC_CLASS_SOFT) { 3031233628Sfabient error = EINVAL; 3032233628Sfabient break; 3033233628Sfabient } 3034233628Sfabient 3035233628Sfabient nevent = 0; 3036245339Ssbruno for (ev = PMC_EV_SOFT_FIRST; (int)ev <= PMC_EV_SOFT_LAST; ev++) { 3037233628Sfabient ps = pmc_soft_ev_acquire(ev); 3038233628Sfabient if (ps == NULL) 3039233628Sfabient continue; 3040233628Sfabient bcopy(&ps->ps_ev, &dev, sizeof(dev)); 3041233628Sfabient pmc_soft_ev_release(ps); 3042233628Sfabient 3043233628Sfabient error = copyout(&dev, 3044233628Sfabient &gei->pm_events[nevent], 3045233628Sfabient sizeof(struct pmc_dyn_event_descr)); 3046233628Sfabient if (error != 0) 3047233628Sfabient break; 3048233628Sfabient nevent++; 3049233628Sfabient } 3050233628Sfabient if (error != 0) 3051233628Sfabient break; 3052233628Sfabient 3053233628Sfabient error = copyout(&nevent, &gei->pm_nevent, 3054233628Sfabient sizeof(nevent)); 3055233628Sfabient } 3056233628Sfabient break; 3057233628Sfabient 3058145256Sjkoshy /* 3059145256Sjkoshy * Get module statistics 3060145256Sjkoshy */ 3061145256Sjkoshy 3062145256Sjkoshy case PMC_OP_GETDRIVERSTATS: 3063145256Sjkoshy { 3064145256Sjkoshy struct pmc_op_getdriverstats gms; 3065145256Sjkoshy 3066145256Sjkoshy bcopy(&pmc_stats, &gms, sizeof(gms)); 3067145256Sjkoshy error = copyout(&gms, arg, sizeof(gms)); 3068145256Sjkoshy } 3069145256Sjkoshy break; 3070145256Sjkoshy 3071145256Sjkoshy 3072145256Sjkoshy /* 3073145256Sjkoshy * Retrieve module version number 3074145256Sjkoshy */ 3075145256Sjkoshy 3076145256Sjkoshy case PMC_OP_GETMODULEVERSION: 3077145256Sjkoshy { 3078147191Sjkoshy uint32_t cv, modv; 3079147191Sjkoshy 3080147191Sjkoshy /* retrieve the client's idea of the ABI version */ 3081147191Sjkoshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 3082147191Sjkoshy break; 3083147191Sjkoshy /* don't service clients newer than our driver */ 3084147191Sjkoshy modv = PMC_VERSION; 3085147191Sjkoshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 3086147191Sjkoshy error = EPROGMISMATCH; 3087147191Sjkoshy break; 3088147191Sjkoshy } 3089147191Sjkoshy error = copyout(&modv, arg, sizeof(int)); 3090145256Sjkoshy } 3091145256Sjkoshy break; 3092145256Sjkoshy 3093145256Sjkoshy 3094145256Sjkoshy /* 3095145256Sjkoshy * Retrieve the state of all the PMCs on a given 3096145256Sjkoshy * CPU. 3097145256Sjkoshy */ 3098145256Sjkoshy 3099145256Sjkoshy case PMC_OP_GETPMCINFO: 3100145256Sjkoshy { 3101184802Sjkoshy int ari; 3102184802Sjkoshy struct pmc *pm; 3103184802Sjkoshy size_t pmcinfo_size; 3104145256Sjkoshy uint32_t cpu, n, npmc; 3105184802Sjkoshy struct pmc_owner *po; 3106184802Sjkoshy struct pmc_binding pb; 3107184802Sjkoshy struct pmc_classdep *pcd; 3108145256Sjkoshy struct pmc_info *p, *pmcinfo; 3109145256Sjkoshy struct pmc_op_getpmcinfo *gpi; 3110145256Sjkoshy 3111145256Sjkoshy PMC_DOWNGRADE_SX(); 3112145256Sjkoshy 3113145256Sjkoshy gpi = (struct pmc_op_getpmcinfo *) arg; 3114145256Sjkoshy 3115145256Sjkoshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 3116145256Sjkoshy break; 3117145256Sjkoshy 3118183266Sjkoshy if (cpu >= pmc_cpu_max()) { 3119145256Sjkoshy error = EINVAL; 3120145256Sjkoshy break; 3121145256Sjkoshy } 3122145256Sjkoshy 3123183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3124145256Sjkoshy error = ENXIO; 3125145256Sjkoshy break; 3126145256Sjkoshy } 3127145256Sjkoshy 3128145256Sjkoshy /* switch to CPU 'cpu' */ 3129145256Sjkoshy pmc_save_cpu_binding(&pb); 3130145256Sjkoshy pmc_select_cpu(cpu); 3131145256Sjkoshy 3132145256Sjkoshy npmc = md->pmd_npmc; 3133145256Sjkoshy 3134145256Sjkoshy pmcinfo_size = npmc * sizeof(struct pmc_info); 3135343350Smarkj pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK | M_ZERO); 3136145256Sjkoshy 3137145256Sjkoshy p = pmcinfo; 3138145256Sjkoshy 3139145256Sjkoshy for (n = 0; n < md->pmd_npmc; n++, p++) { 3140145256Sjkoshy 3141184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &ari); 3142184802Sjkoshy 3143184802Sjkoshy KASSERT(pcd != NULL, 3144184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 3145184802Sjkoshy 3146184802Sjkoshy if ((error = pcd->pcd_describe(cpu, ari, p, &pm)) != 0) 3147145256Sjkoshy break; 3148145256Sjkoshy 3149145256Sjkoshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 3150145256Sjkoshy p->pm_rowdisp = PMC_DISP_STANDALONE; 3151145256Sjkoshy else if (PMC_ROW_DISP_IS_THREAD(n)) 3152145256Sjkoshy p->pm_rowdisp = PMC_DISP_THREAD; 3153145256Sjkoshy else 3154145256Sjkoshy p->pm_rowdisp = PMC_DISP_FREE; 3155145256Sjkoshy 3156145256Sjkoshy p->pm_ownerpid = -1; 3157145256Sjkoshy 3158145256Sjkoshy if (pm == NULL) /* no PMC associated */ 3159145256Sjkoshy continue; 3160145256Sjkoshy 3161145256Sjkoshy po = pm->pm_owner; 3162145256Sjkoshy 3163145256Sjkoshy KASSERT(po->po_owner != NULL, 3164145256Sjkoshy ("[pmc,%d] pmc_owner had a null proc pointer", 3165145256Sjkoshy __LINE__)); 3166145256Sjkoshy 3167145256Sjkoshy p->pm_ownerpid = po->po_owner->p_pid; 3168145774Sjkoshy p->pm_mode = PMC_TO_MODE(pm); 3169145256Sjkoshy p->pm_event = pm->pm_event; 3170145256Sjkoshy p->pm_flags = pm->pm_flags; 3171145256Sjkoshy 3172145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3173145256Sjkoshy p->pm_reloadcount = 3174145256Sjkoshy pm->pm_sc.pm_reloadcount; 3175145256Sjkoshy } 3176145256Sjkoshy 3177145256Sjkoshy pmc_restore_cpu_binding(&pb); 3178145256Sjkoshy 3179145256Sjkoshy /* now copy out the PMC info collected */ 3180145256Sjkoshy if (error == 0) 3181145256Sjkoshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 3182145256Sjkoshy 3183184205Sdes free(pmcinfo, M_PMC); 3184145256Sjkoshy } 3185145256Sjkoshy break; 3186145256Sjkoshy 3187145256Sjkoshy 3188145256Sjkoshy /* 3189145256Sjkoshy * Set the administrative state of a PMC. I.e. whether 3190145256Sjkoshy * the PMC is to be used or not. 3191145256Sjkoshy */ 3192145256Sjkoshy 3193145256Sjkoshy case PMC_OP_PMCADMIN: 3194145256Sjkoshy { 3195145256Sjkoshy int cpu, ri; 3196145256Sjkoshy enum pmc_state request; 3197145256Sjkoshy struct pmc_cpu *pc; 3198145256Sjkoshy struct pmc_hw *phw; 3199145256Sjkoshy struct pmc_op_pmcadmin pma; 3200145256Sjkoshy struct pmc_binding pb; 3201145256Sjkoshy 3202145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3203145256Sjkoshy 3204145256Sjkoshy KASSERT(td == curthread, 3205145256Sjkoshy ("[pmc,%d] td != curthread", __LINE__)); 3206145256Sjkoshy 3207164033Srwatson error = priv_check(td, PRIV_PMC_MANAGE); 3208164033Srwatson if (error) 3209145256Sjkoshy break; 3210145256Sjkoshy 3211145256Sjkoshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 3212145256Sjkoshy break; 3213145256Sjkoshy 3214145256Sjkoshy cpu = pma.pm_cpu; 3215145256Sjkoshy 3216183266Sjkoshy if (cpu < 0 || cpu >= (int) pmc_cpu_max()) { 3217145256Sjkoshy error = EINVAL; 3218145256Sjkoshy break; 3219145256Sjkoshy } 3220145256Sjkoshy 3221183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3222145256Sjkoshy error = ENXIO; 3223145256Sjkoshy break; 3224145256Sjkoshy } 3225145256Sjkoshy 3226145256Sjkoshy request = pma.pm_state; 3227145256Sjkoshy 3228145256Sjkoshy if (request != PMC_STATE_DISABLED && 3229145256Sjkoshy request != PMC_STATE_FREE) { 3230145256Sjkoshy error = EINVAL; 3231145256Sjkoshy break; 3232145256Sjkoshy } 3233145256Sjkoshy 3234145256Sjkoshy ri = pma.pm_pmc; /* pmc id == row index */ 3235145256Sjkoshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 3236145256Sjkoshy error = EINVAL; 3237145256Sjkoshy break; 3238145256Sjkoshy } 3239145256Sjkoshy 3240145256Sjkoshy /* 3241145256Sjkoshy * We can't disable a PMC with a row-index allocated 3242145256Sjkoshy * for process virtual PMCs. 3243145256Sjkoshy */ 3244145256Sjkoshy 3245145256Sjkoshy if (PMC_ROW_DISP_IS_THREAD(ri) && 3246145256Sjkoshy request == PMC_STATE_DISABLED) { 3247145256Sjkoshy error = EBUSY; 3248145256Sjkoshy break; 3249145256Sjkoshy } 3250145256Sjkoshy 3251145256Sjkoshy /* 3252145256Sjkoshy * otherwise, this PMC on this CPU is either free or 3253145256Sjkoshy * in system-wide mode. 3254145256Sjkoshy */ 3255145256Sjkoshy 3256145256Sjkoshy pmc_save_cpu_binding(&pb); 3257145256Sjkoshy pmc_select_cpu(cpu); 3258145256Sjkoshy 3259145256Sjkoshy pc = pmc_pcpu[cpu]; 3260145256Sjkoshy phw = pc->pc_hwpmcs[ri]; 3261145256Sjkoshy 3262145256Sjkoshy /* 3263145256Sjkoshy * XXX do we need some kind of 'forced' disable? 3264145256Sjkoshy */ 3265145256Sjkoshy 3266145256Sjkoshy if (phw->phw_pmc == NULL) { 3267145256Sjkoshy if (request == PMC_STATE_DISABLED && 3268145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 3269145256Sjkoshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 3270145256Sjkoshy PMC_MARK_ROW_STANDALONE(ri); 3271145256Sjkoshy } else if (request == PMC_STATE_FREE && 3272145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 3273145256Sjkoshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 3274145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 3275145256Sjkoshy } 3276145256Sjkoshy /* other cases are a no-op */ 3277145256Sjkoshy } else 3278145256Sjkoshy error = EBUSY; 3279145256Sjkoshy 3280145256Sjkoshy pmc_restore_cpu_binding(&pb); 3281145256Sjkoshy } 3282145256Sjkoshy break; 3283145256Sjkoshy 3284145256Sjkoshy 3285145256Sjkoshy /* 3286145256Sjkoshy * Allocate a PMC. 3287145256Sjkoshy */ 3288145256Sjkoshy 3289145256Sjkoshy case PMC_OP_PMCALLOCATE: 3290145256Sjkoshy { 3291184802Sjkoshy int adjri, n; 3292184802Sjkoshy u_int cpu; 3293145256Sjkoshy uint32_t caps; 3294184802Sjkoshy struct pmc *pmc; 3295145256Sjkoshy enum pmc_mode mode; 3296145774Sjkoshy struct pmc_hw *phw; 3297184802Sjkoshy struct pmc_binding pb; 3298184802Sjkoshy struct pmc_classdep *pcd; 3299145256Sjkoshy struct pmc_op_pmcallocate pa; 3300145256Sjkoshy 3301145256Sjkoshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 3302145256Sjkoshy break; 3303145256Sjkoshy 3304145256Sjkoshy caps = pa.pm_caps; 3305145256Sjkoshy mode = pa.pm_mode; 3306145256Sjkoshy cpu = pa.pm_cpu; 3307145256Sjkoshy 3308145256Sjkoshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 3309145256Sjkoshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 3310183266Sjkoshy (cpu != (u_int) PMC_CPU_ANY && cpu >= pmc_cpu_max())) { 3311145256Sjkoshy error = EINVAL; 3312145256Sjkoshy break; 3313145256Sjkoshy } 3314145256Sjkoshy 3315145256Sjkoshy /* 3316145256Sjkoshy * Virtual PMCs should only ask for a default CPU. 3317145256Sjkoshy * System mode PMCs need to specify a non-default CPU. 3318145256Sjkoshy */ 3319145256Sjkoshy 3320145256Sjkoshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 3321145256Sjkoshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 3322145256Sjkoshy error = EINVAL; 3323145256Sjkoshy break; 3324145256Sjkoshy } 3325145256Sjkoshy 3326145256Sjkoshy /* 3327183266Sjkoshy * Check that an inactive CPU is not being asked for. 3328145256Sjkoshy */ 3329145256Sjkoshy 3330183266Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && !pmc_cpu_is_active(cpu)) { 3331145256Sjkoshy error = ENXIO; 3332145256Sjkoshy break; 3333145256Sjkoshy } 3334145256Sjkoshy 3335145256Sjkoshy /* 3336145256Sjkoshy * Refuse an allocation for a system-wide PMC if this 3337145256Sjkoshy * process has been jailed, or if this process lacks 3338145256Sjkoshy * super-user credentials and the sysctl tunable 3339145256Sjkoshy * 'security.bsd.unprivileged_syspmcs' is zero. 3340145256Sjkoshy */ 3341145256Sjkoshy 3342145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3343164033Srwatson if (jailed(curthread->td_ucred)) { 3344145256Sjkoshy error = EPERM; 3345164033Srwatson break; 3346164033Srwatson } 3347164033Srwatson if (!pmc_unprivileged_syspmcs) { 3348164033Srwatson error = priv_check(curthread, 3349164033Srwatson PRIV_PMC_SYSTEM); 3350164033Srwatson if (error) 3351164033Srwatson break; 3352164033Srwatson } 3353145256Sjkoshy } 3354145256Sjkoshy 3355145256Sjkoshy /* 3356145256Sjkoshy * Look for valid values for 'pm_flags' 3357145256Sjkoshy */ 3358145256Sjkoshy 3359147191Sjkoshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 3360174395Sjkoshy PMC_F_LOG_PROCEXIT | PMC_F_CALLCHAIN)) != 0) { 3361145256Sjkoshy error = EINVAL; 3362145256Sjkoshy break; 3363145256Sjkoshy } 3364145256Sjkoshy 3365147191Sjkoshy /* process logging options are not allowed for system PMCs */ 3366147191Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 3367147191Sjkoshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 3368147191Sjkoshy error = EINVAL; 3369147191Sjkoshy break; 3370147191Sjkoshy } 3371147191Sjkoshy 3372145256Sjkoshy /* 3373145256Sjkoshy * All sampling mode PMCs need to be able to interrupt the 3374145256Sjkoshy * CPU. 3375145256Sjkoshy */ 3376147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode)) 3377145256Sjkoshy caps |= PMC_CAP_INTERRUPT; 3378145256Sjkoshy 3379149374Sjkoshy /* A valid class specifier should have been passed in. */ 3380149374Sjkoshy for (n = 0; n < md->pmd_nclass; n++) 3381184802Sjkoshy if (md->pmd_classdep[n].pcd_class == pa.pm_class) 3382149374Sjkoshy break; 3383149374Sjkoshy if (n == md->pmd_nclass) { 3384149374Sjkoshy error = EINVAL; 3385149374Sjkoshy break; 3386149374Sjkoshy } 3387149374Sjkoshy 3388149374Sjkoshy /* The requested PMC capabilities should be feasible. */ 3389184802Sjkoshy if ((md->pmd_classdep[n].pcd_caps & caps) != caps) { 3390149374Sjkoshy error = EOPNOTSUPP; 3391149374Sjkoshy break; 3392149374Sjkoshy } 3393149374Sjkoshy 3394282658Sjhb PMCDBG4(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 3395145256Sjkoshy pa.pm_ev, caps, mode, cpu); 3396145256Sjkoshy 3397145256Sjkoshy pmc = pmc_allocate_pmc_descriptor(); 3398145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 3399145774Sjkoshy PMC_ID_INVALID); 3400145256Sjkoshy pmc->pm_event = pa.pm_ev; 3401145256Sjkoshy pmc->pm_state = PMC_STATE_FREE; 3402145256Sjkoshy pmc->pm_caps = caps; 3403145256Sjkoshy pmc->pm_flags = pa.pm_flags; 3404145256Sjkoshy 3405145256Sjkoshy /* switch thread to CPU 'cpu' */ 3406145256Sjkoshy pmc_save_cpu_binding(&pb); 3407145256Sjkoshy 3408145256Sjkoshy#define PMC_IS_SHAREABLE_PMC(cpu, n) \ 3409145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 3410145256Sjkoshy PMC_PHW_FLAG_IS_SHAREABLE) 3411145256Sjkoshy#define PMC_IS_UNALLOCATED(cpu, n) \ 3412145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 3413145256Sjkoshy 3414145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3415145256Sjkoshy pmc_select_cpu(cpu); 3416184802Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3417184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3418145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3419145256Sjkoshy pmc_can_allocate_rowindex( 3420145774Sjkoshy curthread->td_proc, n, cpu) == 0 && 3421145256Sjkoshy (PMC_IS_UNALLOCATED(cpu, n) || 3422145256Sjkoshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 3423184802Sjkoshy pcd->pcd_allocate_pmc(cpu, adjri, pmc, 3424145256Sjkoshy &pa) == 0) 3425145256Sjkoshy break; 3426184802Sjkoshy } 3427145256Sjkoshy } else { 3428145256Sjkoshy /* Process virtual mode */ 3429145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3430184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3431145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3432145256Sjkoshy pmc_can_allocate_rowindex( 3433145774Sjkoshy curthread->td_proc, n, 3434145774Sjkoshy PMC_CPU_ANY) == 0 && 3435184802Sjkoshy pcd->pcd_allocate_pmc(curthread->td_oncpu, 3436184802Sjkoshy adjri, pmc, &pa) == 0) 3437145256Sjkoshy break; 3438145256Sjkoshy } 3439145256Sjkoshy } 3440145256Sjkoshy 3441145256Sjkoshy#undef PMC_IS_UNALLOCATED 3442145256Sjkoshy#undef PMC_IS_SHAREABLE_PMC 3443145256Sjkoshy 3444145256Sjkoshy pmc_restore_cpu_binding(&pb); 3445145256Sjkoshy 3446145256Sjkoshy if (n == (int) md->pmd_npmc) { 3447145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3448145256Sjkoshy pmc = NULL; 3449145256Sjkoshy error = EINVAL; 3450145256Sjkoshy break; 3451145256Sjkoshy } 3452145256Sjkoshy 3453145774Sjkoshy /* Fill in the correct value in the ID field */ 3454145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 3455145256Sjkoshy 3456282658Sjhb PMCDBG5(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 3457145774Sjkoshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 3458145774Sjkoshy 3459147191Sjkoshy /* Process mode PMCs with logging enabled need log files */ 3460147191Sjkoshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 3461147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3462147191Sjkoshy 3463147191Sjkoshy /* All system mode sampling PMCs require a log file */ 3464147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 3465147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3466147191Sjkoshy 3467145256Sjkoshy /* 3468145256Sjkoshy * Configure global pmc's immediately 3469145256Sjkoshy */ 3470145256Sjkoshy 3471145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 3472145774Sjkoshy 3473145774Sjkoshy pmc_save_cpu_binding(&pb); 3474145774Sjkoshy pmc_select_cpu(cpu); 3475145774Sjkoshy 3476145774Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 3477184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3478145774Sjkoshy 3479145774Sjkoshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 3480184802Sjkoshy (error = pcd->pcd_config_pmc(cpu, adjri, pmc)) != 0) { 3481184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pmc); 3482145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3483145256Sjkoshy pmc = NULL; 3484145774Sjkoshy pmc_restore_cpu_binding(&pb); 3485145774Sjkoshy error = EPERM; 3486145256Sjkoshy break; 3487145256Sjkoshy } 3488145256Sjkoshy 3489145774Sjkoshy pmc_restore_cpu_binding(&pb); 3490145774Sjkoshy } 3491145256Sjkoshy 3492145256Sjkoshy pmc->pm_state = PMC_STATE_ALLOCATED; 3493145256Sjkoshy 3494145256Sjkoshy /* 3495145256Sjkoshy * mark row disposition 3496145256Sjkoshy */ 3497145256Sjkoshy 3498145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 3499145256Sjkoshy PMC_MARK_ROW_STANDALONE(n); 3500145256Sjkoshy else 3501145256Sjkoshy PMC_MARK_ROW_THREAD(n); 3502145256Sjkoshy 3503145256Sjkoshy /* 3504145256Sjkoshy * Register this PMC with the current thread as its owner. 3505145256Sjkoshy */ 3506145256Sjkoshy 3507145256Sjkoshy if ((error = 3508145256Sjkoshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 3509145256Sjkoshy pmc_release_pmc_descriptor(pmc); 3510273236Smarkj pmc_destroy_pmc_descriptor(pmc); 3511145256Sjkoshy pmc = NULL; 3512145256Sjkoshy break; 3513145256Sjkoshy } 3514145256Sjkoshy 3515145256Sjkoshy /* 3516145256Sjkoshy * Return the allocated index. 3517145256Sjkoshy */ 3518145256Sjkoshy 3519145774Sjkoshy pa.pm_pmcid = pmc->pm_id; 3520145256Sjkoshy 3521145256Sjkoshy error = copyout(&pa, arg, sizeof(pa)); 3522145256Sjkoshy } 3523145256Sjkoshy break; 3524145256Sjkoshy 3525145256Sjkoshy 3526145256Sjkoshy /* 3527145256Sjkoshy * Attach a PMC to a process. 3528145256Sjkoshy */ 3529145256Sjkoshy 3530145256Sjkoshy case PMC_OP_PMCATTACH: 3531145256Sjkoshy { 3532145256Sjkoshy struct pmc *pm; 3533145256Sjkoshy struct proc *p; 3534145256Sjkoshy struct pmc_op_pmcattach a; 3535145256Sjkoshy 3536145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3537145256Sjkoshy 3538145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3539145256Sjkoshy break; 3540145256Sjkoshy 3541145256Sjkoshy if (a.pm_pid < 0) { 3542145256Sjkoshy error = EINVAL; 3543145256Sjkoshy break; 3544145256Sjkoshy } else if (a.pm_pid == 0) 3545145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3546145256Sjkoshy 3547145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3548145256Sjkoshy break; 3549145256Sjkoshy 3550145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 3551145256Sjkoshy error = EINVAL; 3552145256Sjkoshy break; 3553145256Sjkoshy } 3554145256Sjkoshy 3555145256Sjkoshy /* PMCs may be (re)attached only when allocated or stopped */ 3556145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3557145256Sjkoshy error = EBUSY; 3558145256Sjkoshy break; 3559145256Sjkoshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 3560145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED) { 3561145256Sjkoshy error = EINVAL; 3562145256Sjkoshy break; 3563145256Sjkoshy } 3564145256Sjkoshy 3565145256Sjkoshy /* lookup pid */ 3566145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3567145256Sjkoshy error = ESRCH; 3568145256Sjkoshy break; 3569145256Sjkoshy } 3570145256Sjkoshy 3571145256Sjkoshy /* 3572145256Sjkoshy * Ignore processes that are working on exiting. 3573145256Sjkoshy */ 3574145256Sjkoshy if (p->p_flag & P_WEXIT) { 3575145256Sjkoshy error = ESRCH; 3576145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3577145256Sjkoshy break; 3578145256Sjkoshy } 3579145256Sjkoshy 3580145256Sjkoshy /* 3581145256Sjkoshy * we are allowed to attach a PMC to a process if 3582145256Sjkoshy * we can debug it. 3583145256Sjkoshy */ 3584145256Sjkoshy error = p_candebug(curthread, p); 3585145256Sjkoshy 3586145256Sjkoshy PROC_UNLOCK(p); 3587145256Sjkoshy 3588145256Sjkoshy if (error == 0) 3589145256Sjkoshy error = pmc_attach_process(p, pm); 3590145256Sjkoshy } 3591145256Sjkoshy break; 3592145256Sjkoshy 3593145256Sjkoshy 3594145256Sjkoshy /* 3595145256Sjkoshy * Detach an attached PMC from a process. 3596145256Sjkoshy */ 3597145256Sjkoshy 3598145256Sjkoshy case PMC_OP_PMCDETACH: 3599145256Sjkoshy { 3600145256Sjkoshy struct pmc *pm; 3601145256Sjkoshy struct proc *p; 3602145256Sjkoshy struct pmc_op_pmcattach a; 3603145256Sjkoshy 3604145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3605145256Sjkoshy break; 3606145256Sjkoshy 3607145256Sjkoshy if (a.pm_pid < 0) { 3608145256Sjkoshy error = EINVAL; 3609145256Sjkoshy break; 3610145256Sjkoshy } else if (a.pm_pid == 0) 3611145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3612145256Sjkoshy 3613145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3614145256Sjkoshy break; 3615145256Sjkoshy 3616145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3617145256Sjkoshy error = ESRCH; 3618145256Sjkoshy break; 3619145256Sjkoshy } 3620145256Sjkoshy 3621145256Sjkoshy /* 3622145256Sjkoshy * Treat processes that are in the process of exiting 3623145256Sjkoshy * as if they were not present. 3624145256Sjkoshy */ 3625145256Sjkoshy 3626145256Sjkoshy if (p->p_flag & P_WEXIT) 3627145256Sjkoshy error = ESRCH; 3628145256Sjkoshy 3629145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3630145256Sjkoshy 3631145256Sjkoshy if (error == 0) 3632145256Sjkoshy error = pmc_detach_process(p, pm); 3633145256Sjkoshy } 3634145256Sjkoshy break; 3635145256Sjkoshy 3636145256Sjkoshy 3637145256Sjkoshy /* 3638147191Sjkoshy * Retrieve the MSR number associated with the counter 3639147191Sjkoshy * 'pmc_id'. This allows processes to directly use RDPMC 3640147191Sjkoshy * instructions to read their PMCs, without the overhead of a 3641147191Sjkoshy * system call. 3642147191Sjkoshy */ 3643147191Sjkoshy 3644147191Sjkoshy case PMC_OP_PMCGETMSR: 3645147191Sjkoshy { 3646184802Sjkoshy int adjri, ri; 3647184802Sjkoshy struct pmc *pm; 3648147191Sjkoshy struct pmc_target *pt; 3649147191Sjkoshy struct pmc_op_getmsr gm; 3650184802Sjkoshy struct pmc_classdep *pcd; 3651147191Sjkoshy 3652147191Sjkoshy PMC_DOWNGRADE_SX(); 3653147191Sjkoshy 3654147191Sjkoshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3655147191Sjkoshy break; 3656147191Sjkoshy 3657147191Sjkoshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3658147191Sjkoshy break; 3659147191Sjkoshy 3660147191Sjkoshy /* 3661147191Sjkoshy * The allocated PMC has to be a process virtual PMC, 3662147191Sjkoshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3663147191Sjkoshy * read using the PMCREAD operation since they may be 3664147191Sjkoshy * allocated on a different CPU than the one we could 3665147191Sjkoshy * be running on at the time of the RDPMC instruction. 3666147191Sjkoshy * 3667147191Sjkoshy * The GETMSR operation is not allowed for PMCs that 3668147191Sjkoshy * are inherited across processes. 3669147191Sjkoshy */ 3670147191Sjkoshy 3671147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3672147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3673147191Sjkoshy error = EINVAL; 3674147191Sjkoshy break; 3675147191Sjkoshy } 3676147191Sjkoshy 3677147191Sjkoshy /* 3678147191Sjkoshy * It only makes sense to use a RDPMC (or its 3679147191Sjkoshy * equivalent instruction on non-x86 architectures) on 3680147191Sjkoshy * a process that has allocated and attached a PMC to 3681147191Sjkoshy * itself. Conversely the PMC is only allowed to have 3682147191Sjkoshy * one process attached to it -- its owner. 3683147191Sjkoshy */ 3684147191Sjkoshy 3685147191Sjkoshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3686147191Sjkoshy LIST_NEXT(pt, pt_next) != NULL || 3687147191Sjkoshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3688147191Sjkoshy error = EINVAL; 3689147191Sjkoshy break; 3690147191Sjkoshy } 3691147191Sjkoshy 3692147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3693184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3694147191Sjkoshy 3695184802Sjkoshy /* PMC class has no 'GETMSR' support */ 3696184802Sjkoshy if (pcd->pcd_get_msr == NULL) { 3697184802Sjkoshy error = ENOSYS; 3698147191Sjkoshy break; 3699184802Sjkoshy } 3700147191Sjkoshy 3701184802Sjkoshy if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) < 0) 3702184802Sjkoshy break; 3703184802Sjkoshy 3704147191Sjkoshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3705147191Sjkoshy break; 3706147191Sjkoshy 3707147191Sjkoshy /* 3708147191Sjkoshy * Mark our process as using MSRs. Update machine 3709147191Sjkoshy * state using a forced context switch. 3710147191Sjkoshy */ 3711147191Sjkoshy 3712147191Sjkoshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3713147191Sjkoshy pmc_force_context_switch(); 3714147191Sjkoshy 3715147191Sjkoshy } 3716147191Sjkoshy break; 3717147191Sjkoshy 3718147191Sjkoshy /* 3719145256Sjkoshy * Release an allocated PMC 3720145256Sjkoshy */ 3721145256Sjkoshy 3722145256Sjkoshy case PMC_OP_PMCRELEASE: 3723145256Sjkoshy { 3724145256Sjkoshy pmc_id_t pmcid; 3725145256Sjkoshy struct pmc *pm; 3726145256Sjkoshy struct pmc_owner *po; 3727145256Sjkoshy struct pmc_op_simple sp; 3728145256Sjkoshy 3729145256Sjkoshy /* 3730145256Sjkoshy * Find PMC pointer for the named PMC. 3731145256Sjkoshy * 3732145256Sjkoshy * Use pmc_release_pmc_descriptor() to switch off the 3733145256Sjkoshy * PMC, remove all its target threads, and remove the 3734145256Sjkoshy * PMC from its owner's list. 3735145256Sjkoshy * 3736145256Sjkoshy * Remove the owner record if this is the last PMC 3737145256Sjkoshy * owned. 3738145256Sjkoshy * 3739145256Sjkoshy * Free up space. 3740145256Sjkoshy */ 3741145256Sjkoshy 3742145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3743145256Sjkoshy break; 3744145256Sjkoshy 3745145256Sjkoshy pmcid = sp.pm_pmcid; 3746145256Sjkoshy 3747145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3748145256Sjkoshy break; 3749145256Sjkoshy 3750145256Sjkoshy po = pm->pm_owner; 3751145256Sjkoshy pmc_release_pmc_descriptor(pm); 3752145256Sjkoshy pmc_maybe_remove_owner(po); 3753273236Smarkj pmc_destroy_pmc_descriptor(pm); 3754145256Sjkoshy } 3755145256Sjkoshy break; 3756145256Sjkoshy 3757145256Sjkoshy 3758145256Sjkoshy /* 3759145256Sjkoshy * Read and/or write a PMC. 3760145256Sjkoshy */ 3761145256Sjkoshy 3762145256Sjkoshy case PMC_OP_PMCRW: 3763145256Sjkoshy { 3764184802Sjkoshy int adjri; 3765184802Sjkoshy struct pmc *pm; 3766145256Sjkoshy uint32_t cpu, ri; 3767184802Sjkoshy pmc_value_t oldvalue; 3768184802Sjkoshy struct pmc_binding pb; 3769184802Sjkoshy struct pmc_op_pmcrw prw; 3770184802Sjkoshy struct pmc_classdep *pcd; 3771145256Sjkoshy struct pmc_op_pmcrw *pprw; 3772145256Sjkoshy 3773145256Sjkoshy PMC_DOWNGRADE_SX(); 3774145256Sjkoshy 3775145256Sjkoshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3776145256Sjkoshy break; 3777145256Sjkoshy 3778145301Simp ri = 0; 3779282658Sjhb PMCDBG2(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3780145256Sjkoshy prw.pm_flags); 3781145256Sjkoshy 3782145256Sjkoshy /* must have at least one flag set */ 3783145256Sjkoshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3784145256Sjkoshy error = EINVAL; 3785145256Sjkoshy break; 3786145256Sjkoshy } 3787145256Sjkoshy 3788145256Sjkoshy /* locate pmc descriptor */ 3789145256Sjkoshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3790145256Sjkoshy break; 3791145256Sjkoshy 3792145256Sjkoshy /* Can't read a PMC that hasn't been started. */ 3793145256Sjkoshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3794145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED && 3795145256Sjkoshy pm->pm_state != PMC_STATE_RUNNING) { 3796145256Sjkoshy error = EINVAL; 3797145256Sjkoshy break; 3798145256Sjkoshy } 3799145256Sjkoshy 3800145256Sjkoshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3801145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3802145256Sjkoshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3803145256Sjkoshy error = EBUSY; 3804145256Sjkoshy break; 3805145256Sjkoshy } 3806145256Sjkoshy 3807145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3808145256Sjkoshy 3809145774Sjkoshy /* 3810145774Sjkoshy * If this PMC is attached to its owner (i.e., 3811145774Sjkoshy * the process requesting this operation) and 3812145774Sjkoshy * is running, then attempt to get an 3813145774Sjkoshy * upto-date reading from hardware for a READ. 3814145774Sjkoshy * Writes are only allowed when the PMC is 3815145774Sjkoshy * stopped, so only update the saved value 3816145774Sjkoshy * field. 3817145774Sjkoshy * 3818145774Sjkoshy * If the PMC is not running, or is not 3819145774Sjkoshy * attached to its owner, read/write to the 3820145774Sjkoshy * savedvalue field. 3821145774Sjkoshy */ 3822145774Sjkoshy 3823145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3824184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3825145774Sjkoshy 3826145256Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3827145774Sjkoshy cpu = curthread->td_oncpu; 3828145774Sjkoshy 3829145774Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3830145774Sjkoshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3831145774Sjkoshy (pm->pm_state == PMC_STATE_RUNNING)) 3832184802Sjkoshy error = (*pcd->pcd_read_pmc)(cpu, adjri, 3833145774Sjkoshy &oldvalue); 3834145774Sjkoshy else 3835145774Sjkoshy oldvalue = pm->pm_gv.pm_savedvalue; 3836145774Sjkoshy } 3837145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3838145256Sjkoshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3839145774Sjkoshy 3840145256Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3841145256Sjkoshy 3842145256Sjkoshy } else { /* System mode PMCs */ 3843145774Sjkoshy cpu = PMC_TO_CPU(pm); 3844145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3845184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3846145256Sjkoshy 3847183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3848145256Sjkoshy error = ENXIO; 3849145256Sjkoshy break; 3850145256Sjkoshy } 3851145256Sjkoshy 3852145256Sjkoshy /* move this thread to CPU 'cpu' */ 3853145256Sjkoshy pmc_save_cpu_binding(&pb); 3854145256Sjkoshy pmc_select_cpu(cpu); 3855145256Sjkoshy 3856145774Sjkoshy critical_enter(); 3857145256Sjkoshy /* save old value */ 3858145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3859184802Sjkoshy if ((error = (*pcd->pcd_read_pmc)(cpu, adjri, 3860145256Sjkoshy &oldvalue))) 3861145256Sjkoshy goto error; 3862145256Sjkoshy /* write out new value */ 3863145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3864184802Sjkoshy error = (*pcd->pcd_write_pmc)(cpu, adjri, 3865145256Sjkoshy prw.pm_value); 3866145256Sjkoshy error: 3867145774Sjkoshy critical_exit(); 3868145256Sjkoshy pmc_restore_cpu_binding(&pb); 3869145256Sjkoshy if (error) 3870145256Sjkoshy break; 3871145256Sjkoshy } 3872145256Sjkoshy 3873145256Sjkoshy pprw = (struct pmc_op_pmcrw *) arg; 3874145256Sjkoshy 3875282641Sjhb#ifdef HWPMC_DEBUG 3876145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3877282658Sjhb PMCDBG3(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3878145256Sjkoshy ri, prw.pm_value, oldvalue); 3879156778Sjkoshy else if (prw.pm_flags & PMC_F_OLDVALUE) 3880282658Sjhb PMCDBG2(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3881145256Sjkoshy#endif 3882145256Sjkoshy 3883145256Sjkoshy /* return old value if requested */ 3884145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3885145256Sjkoshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3886145256Sjkoshy sizeof(prw.pm_value)))) 3887145256Sjkoshy break; 3888145256Sjkoshy 3889145256Sjkoshy } 3890145256Sjkoshy break; 3891145256Sjkoshy 3892145256Sjkoshy 3893145256Sjkoshy /* 3894145256Sjkoshy * Set the sampling rate for a sampling mode PMC and the 3895145256Sjkoshy * initial count for a counting mode PMC. 3896145256Sjkoshy */ 3897145256Sjkoshy 3898145256Sjkoshy case PMC_OP_PMCSETCOUNT: 3899145256Sjkoshy { 3900145256Sjkoshy struct pmc *pm; 3901145256Sjkoshy struct pmc_op_pmcsetcount sc; 3902145256Sjkoshy 3903145256Sjkoshy PMC_DOWNGRADE_SX(); 3904145256Sjkoshy 3905145256Sjkoshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3906145256Sjkoshy break; 3907145256Sjkoshy 3908145256Sjkoshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3909145256Sjkoshy break; 3910145256Sjkoshy 3911145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3912145256Sjkoshy error = EBUSY; 3913145256Sjkoshy break; 3914145256Sjkoshy } 3915145256Sjkoshy 3916145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3917145256Sjkoshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3918145256Sjkoshy else 3919145256Sjkoshy pm->pm_sc.pm_initial = sc.pm_count; 3920145256Sjkoshy } 3921145256Sjkoshy break; 3922145256Sjkoshy 3923145256Sjkoshy 3924145256Sjkoshy /* 3925145256Sjkoshy * Start a PMC. 3926145256Sjkoshy */ 3927145256Sjkoshy 3928145256Sjkoshy case PMC_OP_PMCSTART: 3929145256Sjkoshy { 3930145256Sjkoshy pmc_id_t pmcid; 3931145256Sjkoshy struct pmc *pm; 3932145256Sjkoshy struct pmc_op_simple sp; 3933145256Sjkoshy 3934145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3935145256Sjkoshy 3936145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3937145256Sjkoshy break; 3938145256Sjkoshy 3939145256Sjkoshy pmcid = sp.pm_pmcid; 3940145256Sjkoshy 3941145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3942145256Sjkoshy break; 3943145256Sjkoshy 3944145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3945145774Sjkoshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3946145774Sjkoshy pm->pm_id, pmcid)); 3947145256Sjkoshy 3948145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3949145256Sjkoshy break; 3950145256Sjkoshy else if (pm->pm_state != PMC_STATE_STOPPED && 3951145256Sjkoshy pm->pm_state != PMC_STATE_ALLOCATED) { 3952145256Sjkoshy error = EINVAL; 3953145256Sjkoshy break; 3954145256Sjkoshy } 3955145256Sjkoshy 3956145256Sjkoshy error = pmc_start(pm); 3957145256Sjkoshy } 3958145256Sjkoshy break; 3959145256Sjkoshy 3960145256Sjkoshy 3961145256Sjkoshy /* 3962145256Sjkoshy * Stop a PMC. 3963145256Sjkoshy */ 3964145256Sjkoshy 3965145256Sjkoshy case PMC_OP_PMCSTOP: 3966145256Sjkoshy { 3967145256Sjkoshy pmc_id_t pmcid; 3968145256Sjkoshy struct pmc *pm; 3969145256Sjkoshy struct pmc_op_simple sp; 3970145256Sjkoshy 3971145256Sjkoshy PMC_DOWNGRADE_SX(); 3972145256Sjkoshy 3973145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3974145256Sjkoshy break; 3975145256Sjkoshy 3976145256Sjkoshy pmcid = sp.pm_pmcid; 3977145256Sjkoshy 3978145256Sjkoshy /* 3979145256Sjkoshy * Mark the PMC as inactive and invoke the MD stop 3980145256Sjkoshy * routines if needed. 3981145256Sjkoshy */ 3982145256Sjkoshy 3983145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3984145256Sjkoshy break; 3985145256Sjkoshy 3986145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3987145774Sjkoshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3988145774Sjkoshy pm->pm_id, pmcid)); 3989145256Sjkoshy 3990145256Sjkoshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3991145256Sjkoshy break; 3992145256Sjkoshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3993145256Sjkoshy error = EINVAL; 3994145256Sjkoshy break; 3995145256Sjkoshy } 3996145256Sjkoshy 3997145256Sjkoshy error = pmc_stop(pm); 3998145256Sjkoshy } 3999145256Sjkoshy break; 4000145256Sjkoshy 4001145256Sjkoshy 4002145256Sjkoshy /* 4003147867Sjkoshy * Write a user supplied value to the log file. 4004145256Sjkoshy */ 4005145256Sjkoshy 4006145256Sjkoshy case PMC_OP_WRITELOG: 4007145256Sjkoshy { 4008147191Sjkoshy struct pmc_op_writelog wl; 4009147191Sjkoshy struct pmc_owner *po; 4010145256Sjkoshy 4011145256Sjkoshy PMC_DOWNGRADE_SX(); 4012145256Sjkoshy 4013147191Sjkoshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 4014145256Sjkoshy break; 4015145256Sjkoshy 4016147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 4017145256Sjkoshy error = EINVAL; 4018145256Sjkoshy break; 4019145256Sjkoshy } 4020145256Sjkoshy 4021147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 4022145774Sjkoshy error = EINVAL; 4023145774Sjkoshy break; 4024145774Sjkoshy } 4025145774Sjkoshy 4026147191Sjkoshy error = pmclog_process_userlog(po, &wl); 4027145256Sjkoshy } 4028145256Sjkoshy break; 4029145256Sjkoshy 4030147191Sjkoshy 4031145256Sjkoshy default: 4032145256Sjkoshy error = EINVAL; 4033145256Sjkoshy break; 4034145256Sjkoshy } 4035145256Sjkoshy 4036325551Skib if (is_sx_downgraded) 4037325551Skib sx_sunlock(&pmc_sx); 4038325551Skib else 4039325551Skib sx_xunlock(&pmc_sx); 4040325551Skibdone_syscall: 4041145256Sjkoshy if (error) 4042145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 4043145256Sjkoshy 4044325547Skib return (error); 4045145256Sjkoshy} 4046145256Sjkoshy 4047145256Sjkoshy/* 4048145256Sjkoshy * Helper functions 4049145256Sjkoshy */ 4050145256Sjkoshy 4051147191Sjkoshy 4052145256Sjkoshy/* 4053174395Sjkoshy * Mark the thread as needing callchain capture and post an AST. The 4054174395Sjkoshy * actual callchain capture will be done in a context where it is safe 4055174395Sjkoshy * to take page faults. 4056174395Sjkoshy */ 4057174395Sjkoshy 4058174395Sjkoshystatic void 4059186037Sjkoshypmc_post_callchain_callback(void) 4060174395Sjkoshy{ 4061174395Sjkoshy struct thread *td; 4062174395Sjkoshy 4063174395Sjkoshy td = curthread; 4064174395Sjkoshy 4065205998Sfabient /* 4066205998Sfabient * If there is multiple PMCs for the same interrupt ignore new post 4067205998Sfabient */ 4068205998Sfabient if (td->td_pflags & TDP_CALLCHAIN) 4069205998Sfabient return; 4070186037Sjkoshy 4071174395Sjkoshy /* 4072186037Sjkoshy * Mark this thread as needing callchain capture. 4073186037Sjkoshy * `td->td_pflags' will be safe to touch because this thread 4074186037Sjkoshy * was in user space when it was interrupted. 4075174395Sjkoshy */ 4076174395Sjkoshy td->td_pflags |= TDP_CALLCHAIN; 4077174395Sjkoshy 4078174395Sjkoshy /* 4079186037Sjkoshy * Don't let this thread migrate between CPUs until callchain 4080186037Sjkoshy * capture completes. 4081174395Sjkoshy */ 4082186037Sjkoshy sched_pin(); 4083174395Sjkoshy 4084174395Sjkoshy return; 4085174395Sjkoshy} 4086174395Sjkoshy 4087174395Sjkoshy/* 4088147191Sjkoshy * Interrupt processing. 4089147191Sjkoshy * 4090174395Sjkoshy * Find a free slot in the per-cpu array of samples and capture the 4091174395Sjkoshy * current callchain there. If a sample was successfully added, a bit 4092174395Sjkoshy * is set in mask 'pmc_cpumask' denoting that the DO_SAMPLES hook 4093174395Sjkoshy * needs to be invoked from the clock handler. 4094147191Sjkoshy * 4095147191Sjkoshy * This function is meant to be called from an NMI handler. It cannot 4096147191Sjkoshy * use any of the locking primitives supplied by the OS. 4097145256Sjkoshy */ 4098145256Sjkoshy 4099147191Sjkoshyint 4100233628Sfabientpmc_process_interrupt(int cpu, int ring, struct pmc *pm, struct trapframe *tf, 4101174395Sjkoshy int inuserspace) 4102145256Sjkoshy{ 4103174395Sjkoshy int error, callchaindepth; 4104147191Sjkoshy struct thread *td; 4105147191Sjkoshy struct pmc_sample *ps; 4106147191Sjkoshy struct pmc_samplebuffer *psb; 4107145256Sjkoshy 4108147191Sjkoshy error = 0; 4109145256Sjkoshy 4110174395Sjkoshy /* 4111174395Sjkoshy * Allocate space for a sample buffer. 4112174395Sjkoshy */ 4113233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4114145256Sjkoshy 4115147191Sjkoshy ps = psb->ps_write; 4116174395Sjkoshy if (ps->ps_nsamples) { /* in use, reader hasn't caught up */ 4117290811Sjtl CPU_SET_ATOMIC(cpu, &pm->pm_stalled); 4118147191Sjkoshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 4119282658Sjhb PMCDBG6(SAM,INT,1,"(spc) cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", 4120174395Sjkoshy cpu, pm, (void *) tf, inuserspace, 4121147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4122147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4123290813Sjtl callchaindepth = 1; 4124147191Sjkoshy error = ENOMEM; 4125147191Sjkoshy goto done; 4126147191Sjkoshy } 4127145256Sjkoshy 4128174395Sjkoshy 4129174395Sjkoshy /* Fill in entry. */ 4130282658Sjhb PMCDBG6(SAM,INT,1,"cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", cpu, pm, 4131174395Sjkoshy (void *) tf, inuserspace, 4132147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4133147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4134145256Sjkoshy 4135186037Sjkoshy KASSERT(pm->pm_runcount >= 0, 4136186037Sjkoshy ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm, 4137186037Sjkoshy pm->pm_runcount)); 4138186037Sjkoshy 4139208861Sfabient atomic_add_rel_int(&pm->pm_runcount, 1); /* hold onto PMC */ 4140233628Sfabient 4141147191Sjkoshy ps->ps_pmc = pm; 4142147191Sjkoshy if ((td = curthread) && td->td_proc) 4143147191Sjkoshy ps->ps_pid = td->td_proc->p_pid; 4144147191Sjkoshy else 4145147191Sjkoshy ps->ps_pid = -1; 4146174395Sjkoshy ps->ps_cpu = cpu; 4147186037Sjkoshy ps->ps_td = td; 4148174395Sjkoshy ps->ps_flags = inuserspace ? PMC_CC_F_USERSPACE : 0; 4149145256Sjkoshy 4150174395Sjkoshy callchaindepth = (pm->pm_flags & PMC_F_CALLCHAIN) ? 4151174395Sjkoshy pmc_callchaindepth : 1; 4152174395Sjkoshy 4153174395Sjkoshy if (callchaindepth == 1) 4154174395Sjkoshy ps->ps_pc[0] = PMC_TRAPFRAME_TO_PC(tf); 4155174395Sjkoshy else { 4156174395Sjkoshy /* 4157174395Sjkoshy * Kernel stack traversals can be done immediately, 4158174395Sjkoshy * while we defer to an AST for user space traversals. 4159174395Sjkoshy */ 4160233628Sfabient if (!inuserspace) { 4161174395Sjkoshy callchaindepth = 4162174395Sjkoshy pmc_save_kernel_callchain(ps->ps_pc, 4163174395Sjkoshy callchaindepth, tf); 4164233628Sfabient } else { 4165186037Sjkoshy pmc_post_callchain_callback(); 4166174395Sjkoshy callchaindepth = PMC_SAMPLE_INUSE; 4167174395Sjkoshy } 4168174395Sjkoshy } 4169174395Sjkoshy 4170174395Sjkoshy ps->ps_nsamples = callchaindepth; /* mark entry as in use */ 4171174395Sjkoshy 4172147191Sjkoshy /* increment write pointer, modulo ring buffer size */ 4173147191Sjkoshy ps++; 4174147191Sjkoshy if (ps == psb->ps_fence) 4175147191Sjkoshy psb->ps_write = psb->ps_samples; 4176147191Sjkoshy else 4177147191Sjkoshy psb->ps_write = ps; 4178145256Sjkoshy 4179147191Sjkoshy done: 4180147191Sjkoshy /* mark CPU as needing processing */ 4181290813Sjtl if (callchaindepth != PMC_SAMPLE_INUSE) 4182290813Sjtl CPU_SET_ATOMIC(cpu, &pmc_cpumask); 4183147191Sjkoshy 4184174395Sjkoshy return (error); 4185145256Sjkoshy} 4186145256Sjkoshy 4187174395Sjkoshy/* 4188174395Sjkoshy * Capture a user call chain. This function will be called from ast() 4189174395Sjkoshy * before control returns to userland and before the process gets 4190174395Sjkoshy * rescheduled. 4191174395Sjkoshy */ 4192147191Sjkoshy 4193174395Sjkoshystatic void 4194233628Sfabientpmc_capture_user_callchain(int cpu, int ring, struct trapframe *tf) 4195174395Sjkoshy{ 4196174395Sjkoshy struct pmc *pm; 4197186037Sjkoshy struct thread *td; 4198290813Sjtl struct pmc_sample *ps, *ps_end; 4199174395Sjkoshy struct pmc_samplebuffer *psb; 4200186037Sjkoshy#ifdef INVARIANTS 4201186037Sjkoshy int ncallchains; 4202300902Sandrew int nfree; 4203186037Sjkoshy#endif 4204174395Sjkoshy 4205233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4206186037Sjkoshy td = curthread; 4207174395Sjkoshy 4208186037Sjkoshy KASSERT(td->td_pflags & TDP_CALLCHAIN, 4209186037Sjkoshy ("[pmc,%d] Retrieving callchain for thread that doesn't want it", 4210186037Sjkoshy __LINE__)); 4211186037Sjkoshy 4212186037Sjkoshy#ifdef INVARIANTS 4213186037Sjkoshy ncallchains = 0; 4214300902Sandrew nfree = 0; 4215186037Sjkoshy#endif 4216186037Sjkoshy 4217174395Sjkoshy /* 4218174395Sjkoshy * Iterate through all deferred callchain requests. 4219290813Sjtl * Walk from the current read pointer to the current 4220290813Sjtl * write pointer. 4221174395Sjkoshy */ 4222174395Sjkoshy 4223290813Sjtl ps = psb->ps_read; 4224290813Sjtl ps_end = psb->ps_write; 4225290813Sjtl do { 4226300902Sandrew#ifdef INVARIANTS 4227300902Sandrew if (ps->ps_pmc->pm_state != PMC_STATE_RUNNING) 4228300902Sandrew nfree++; 4229300902Sandrew#endif 4230174395Sjkoshy if (ps->ps_nsamples != PMC_SAMPLE_INUSE) 4231290813Sjtl goto next; 4232186037Sjkoshy if (ps->ps_td != td) 4233290813Sjtl goto next; 4234174395Sjkoshy 4235186037Sjkoshy KASSERT(ps->ps_cpu == cpu, 4236186037Sjkoshy ("[pmc,%d] cpu mismatch ps_cpu=%d pcpu=%d", __LINE__, 4237186037Sjkoshy ps->ps_cpu, PCPU_GET(cpuid))); 4238186037Sjkoshy 4239174395Sjkoshy pm = ps->ps_pmc; 4240174395Sjkoshy 4241174395Sjkoshy KASSERT(pm->pm_flags & PMC_F_CALLCHAIN, 4242174395Sjkoshy ("[pmc,%d] Retrieving callchain for PMC that doesn't " 4243174395Sjkoshy "want it", __LINE__)); 4244174395Sjkoshy 4245186037Sjkoshy KASSERT(pm->pm_runcount > 0, 4246186037Sjkoshy ("[pmc,%d] runcount %d", __LINE__, pm->pm_runcount)); 4247186037Sjkoshy 4248174395Sjkoshy /* 4249174395Sjkoshy * Retrieve the callchain and mark the sample buffer 4250174395Sjkoshy * as 'processable' by the timer tick sweep code. 4251174395Sjkoshy */ 4252174395Sjkoshy ps->ps_nsamples = pmc_save_user_callchain(ps->ps_pc, 4253174395Sjkoshy pmc_callchaindepth, tf); 4254186037Sjkoshy 4255186037Sjkoshy#ifdef INVARIANTS 4256186037Sjkoshy ncallchains++; 4257186037Sjkoshy#endif 4258174395Sjkoshy 4259290813Sjtlnext: 4260290813Sjtl /* increment the pointer, modulo sample ring size */ 4261290813Sjtl if (++ps == psb->ps_fence) 4262290813Sjtl ps = psb->ps_samples; 4263290813Sjtl } while (ps != ps_end); 4264290813Sjtl 4265300902Sandrew KASSERT(ncallchains > 0 || nfree > 0, 4266186037Sjkoshy ("[pmc,%d] cpu %d didn't find a sample to collect", __LINE__, 4267186037Sjkoshy cpu)); 4268186037Sjkoshy 4269242361Sattilio KASSERT(td->td_pinned == 1, 4270233628Sfabient ("[pmc,%d] invalid td_pinned value", __LINE__)); 4271233628Sfabient sched_unpin(); /* Can migrate safely now. */ 4272233628Sfabient 4273290813Sjtl /* mark CPU as needing processing */ 4274290813Sjtl CPU_SET_ATOMIC(cpu, &pmc_cpumask); 4275290813Sjtl 4276174395Sjkoshy return; 4277174395Sjkoshy} 4278174395Sjkoshy 4279145256Sjkoshy/* 4280147191Sjkoshy * Process saved PC samples. 4281145256Sjkoshy */ 4282145256Sjkoshy 4283145256Sjkoshystatic void 4284233628Sfabientpmc_process_samples(int cpu, int ring) 4285145256Sjkoshy{ 4286147191Sjkoshy struct pmc *pm; 4287185363Sjkoshy int adjri, n; 4288147191Sjkoshy struct thread *td; 4289147191Sjkoshy struct pmc_owner *po; 4290147191Sjkoshy struct pmc_sample *ps; 4291184802Sjkoshy struct pmc_classdep *pcd; 4292147191Sjkoshy struct pmc_samplebuffer *psb; 4293145256Sjkoshy 4294147191Sjkoshy KASSERT(PCPU_GET(cpuid) == cpu, 4295147191Sjkoshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 4296147191Sjkoshy PCPU_GET(cpuid), cpu)); 4297145256Sjkoshy 4298233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4299147191Sjkoshy 4300147191Sjkoshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 4301147191Sjkoshy 4302147191Sjkoshy ps = psb->ps_read; 4303174395Sjkoshy if (ps->ps_nsamples == PMC_SAMPLE_FREE) 4304147191Sjkoshy break; 4305147191Sjkoshy 4306147191Sjkoshy pm = ps->ps_pmc; 4307186037Sjkoshy 4308186037Sjkoshy KASSERT(pm->pm_runcount > 0, 4309186037Sjkoshy ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm, 4310186037Sjkoshy pm->pm_runcount)); 4311186037Sjkoshy 4312147191Sjkoshy po = pm->pm_owner; 4313147191Sjkoshy 4314147191Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 4315147191Sjkoshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 4316147191Sjkoshy pm, PMC_TO_MODE(pm))); 4317147191Sjkoshy 4318147191Sjkoshy /* Ignore PMCs that have been switched off */ 4319147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 4320147191Sjkoshy goto entrydone; 4321147191Sjkoshy 4322233628Sfabient /* If there is a pending AST wait for completion */ 4323233628Sfabient if (ps->ps_nsamples == PMC_SAMPLE_INUSE) { 4324233628Sfabient /* Need a rescan at a later time. */ 4325233628Sfabient CPU_SET_ATOMIC(cpu, &pmc_cpumask); 4326233628Sfabient break; 4327233628Sfabient } 4328233628Sfabient 4329282658Sjhb PMCDBG6(SAM,OPS,1,"cpu=%d pm=%p n=%d fl=%x wr=%d rd=%d", cpu, 4330174395Sjkoshy pm, ps->ps_nsamples, ps->ps_flags, 4331147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4332147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4333147191Sjkoshy 4334147191Sjkoshy /* 4335147191Sjkoshy * If this is a process-mode PMC that is attached to 4336147191Sjkoshy * its owner, and if the PC is in user mode, update 4337147191Sjkoshy * profiling statistics like timer-based profiling 4338147191Sjkoshy * would have done. 4339147191Sjkoshy */ 4340147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 4341174395Sjkoshy if (ps->ps_flags & PMC_CC_F_USERSPACE) { 4342147191Sjkoshy td = FIRST_THREAD_IN_PROC(po->po_owner); 4343174395Sjkoshy addupc_intr(td, ps->ps_pc[0], 1); 4344147191Sjkoshy } 4345147191Sjkoshy goto entrydone; 4346147191Sjkoshy } 4347147191Sjkoshy 4348147191Sjkoshy /* 4349147191Sjkoshy * Otherwise, this is either a sampling mode PMC that 4350147191Sjkoshy * is attached to a different process than its owner, 4351147191Sjkoshy * or a system-wide sampling PMC. Dispatch a log 4352147191Sjkoshy * entry to the PMC's owner process. 4353147191Sjkoshy */ 4354174395Sjkoshy pmclog_process_callchain(pm, ps); 4355147191Sjkoshy 4356147191Sjkoshy entrydone: 4357233628Sfabient ps->ps_nsamples = 0; /* mark entry as free */ 4358208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount, 1); 4359147191Sjkoshy 4360147191Sjkoshy /* increment read pointer, modulo sample size */ 4361147191Sjkoshy if (++ps == psb->ps_fence) 4362147191Sjkoshy psb->ps_read = psb->ps_samples; 4363147191Sjkoshy else 4364147191Sjkoshy psb->ps_read = ps; 4365147191Sjkoshy } 4366147191Sjkoshy 4367147191Sjkoshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 4368147191Sjkoshy 4369147191Sjkoshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 4370147191Sjkoshy if (n == 0) 4371147191Sjkoshy return; 4372147191Sjkoshy 4373147191Sjkoshy /* 4374147191Sjkoshy * Restart any stalled sampling PMCs on this CPU. 4375147191Sjkoshy * 4376147867Sjkoshy * If the NMI handler sets the pm_stalled field of a PMC after 4377147867Sjkoshy * the check below, we'll end up processing the stalled PMC at 4378147867Sjkoshy * the next hardclock tick. 4379147191Sjkoshy */ 4380147191Sjkoshy for (n = 0; n < md->pmd_npmc; n++) { 4381184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 4382184802Sjkoshy KASSERT(pcd != NULL, 4383184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 4384184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu,adjri,&pm); 4385184802Sjkoshy 4386147191Sjkoshy if (pm == NULL || /* !cfg'ed */ 4387147191Sjkoshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 4388147191Sjkoshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 4389290811Sjtl !CPU_ISSET(cpu, &pm->pm_cpustate) || /* !desired */ 4390290811Sjtl !CPU_ISSET(cpu, &pm->pm_stalled)) /* !stalled */ 4391147191Sjkoshy continue; 4392147191Sjkoshy 4393290811Sjtl CPU_CLR_ATOMIC(cpu, &pm->pm_stalled); 4394184802Sjkoshy (*pcd->pcd_start_pmc)(cpu, adjri); 4395147191Sjkoshy } 4396145256Sjkoshy} 4397145256Sjkoshy 4398145256Sjkoshy/* 4399145256Sjkoshy * Event handlers. 4400145256Sjkoshy */ 4401145256Sjkoshy 4402145256Sjkoshy/* 4403145256Sjkoshy * Handle a process exit. 4404145256Sjkoshy * 4405147191Sjkoshy * Remove this process from all hash tables. If this process 4406147191Sjkoshy * owned any PMCs, turn off those PMCs and deallocate them, 4407147191Sjkoshy * removing any associations with target processes. 4408147191Sjkoshy * 4409147191Sjkoshy * This function will be called by the last 'thread' of a 4410147191Sjkoshy * process. 4411147191Sjkoshy * 4412145256Sjkoshy * XXX This eventhandler gets called early in the exit process. 4413145256Sjkoshy * Consider using a 'hook' invocation from thread_exit() or equivalent 4414145256Sjkoshy * spot. Another negative is that kse_exit doesn't seem to call 4415145256Sjkoshy * exit1() [??]. 4416147191Sjkoshy * 4417145256Sjkoshy */ 4418145256Sjkoshy 4419145256Sjkoshystatic void 4420145256Sjkoshypmc_process_exit(void *arg __unused, struct proc *p) 4421145256Sjkoshy{ 4422184802Sjkoshy struct pmc *pm; 4423184802Sjkoshy int adjri, cpu; 4424184802Sjkoshy unsigned int ri; 4425145256Sjkoshy int is_using_hwpmcs; 4426184802Sjkoshy struct pmc_owner *po; 4427147191Sjkoshy struct pmc_process *pp; 4428184802Sjkoshy struct pmc_classdep *pcd; 4429147191Sjkoshy pmc_value_t newvalue, tmp; 4430145256Sjkoshy 4431145256Sjkoshy PROC_LOCK(p); 4432145256Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 4433145256Sjkoshy PROC_UNLOCK(p); 4434145256Sjkoshy 4435147191Sjkoshy /* 4436147191Sjkoshy * Log a sysexit event to all SS PMC owners. 4437147191Sjkoshy */ 4438147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4439147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4440147191Sjkoshy pmclog_process_sysexit(po, p->p_pid); 4441145256Sjkoshy 4442147191Sjkoshy if (!is_using_hwpmcs) 4443147191Sjkoshy return; 4444147191Sjkoshy 4445147191Sjkoshy PMC_GET_SX_XLOCK(); 4446282658Sjhb PMCDBG3(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 4447147191Sjkoshy p->p_comm); 4448147191Sjkoshy 4449147191Sjkoshy /* 4450147191Sjkoshy * Since this code is invoked by the last thread in an exiting 4451147191Sjkoshy * process, we would have context switched IN at some prior 4452147191Sjkoshy * point. However, with PREEMPTION, kernel mode context 4453147191Sjkoshy * switches may happen any time, so we want to disable a 4454298931Spfg * context switch OUT till we get any PMCs targeting this 4455147191Sjkoshy * process off the hardware. 4456147191Sjkoshy * 4457147191Sjkoshy * We also need to atomically remove this process' 4458147191Sjkoshy * entry from our target process hash table, using 4459147191Sjkoshy * PMC_FLAG_REMOVE. 4460147191Sjkoshy */ 4461282658Sjhb PMCDBG3(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 4462147191Sjkoshy p->p_comm); 4463147191Sjkoshy 4464147191Sjkoshy critical_enter(); /* no preemption */ 4465147191Sjkoshy 4466147191Sjkoshy cpu = curthread->td_oncpu; 4467147191Sjkoshy 4468147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, 4469147191Sjkoshy PMC_FLAG_REMOVE)) != NULL) { 4470147191Sjkoshy 4471282658Sjhb PMCDBG2(PRC,EXT,2, 4472147191Sjkoshy "process-exit proc=%p pmc-process=%p", p, pp); 4473147191Sjkoshy 4474147191Sjkoshy /* 4475147191Sjkoshy * The exiting process could the target of 4476147191Sjkoshy * some PMCs which will be running on 4477147191Sjkoshy * currently executing CPU. 4478147191Sjkoshy * 4479147191Sjkoshy * We need to turn these PMCs off like we 4480147191Sjkoshy * would do at context switch OUT time. 4481147191Sjkoshy */ 4482147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 4483147191Sjkoshy 4484147191Sjkoshy /* 4485147191Sjkoshy * Pick up the pmc pointer from hardware 4486147191Sjkoshy * state similar to the CSW_OUT code. 4487147191Sjkoshy */ 4488147191Sjkoshy pm = NULL; 4489147191Sjkoshy 4490184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 4491184802Sjkoshy 4492184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 4493184802Sjkoshy 4494282658Sjhb PMCDBG2(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 4495147191Sjkoshy 4496147191Sjkoshy if (pm == NULL || 4497147191Sjkoshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 4498147191Sjkoshy continue; 4499147191Sjkoshy 4500282658Sjhb PMCDBG4(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 4501147191Sjkoshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 4502147191Sjkoshy pm, pm->pm_state); 4503147191Sjkoshy 4504147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 4505147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 4506147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 4507147191Sjkoshy 4508147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 4509147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 4510147191Sjkoshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 4511147191Sjkoshy 4512147191Sjkoshy KASSERT(pm->pm_runcount > 0, 4513147191Sjkoshy ("[pmc,%d] bad runcount ri %d rc %d", 4514147191Sjkoshy __LINE__, ri, pm->pm_runcount)); 4515147191Sjkoshy 4516290811Sjtl /* 4517290811Sjtl * Change desired state, and then stop if not 4518290811Sjtl * stalled. This two-step dance should avoid 4519290811Sjtl * race conditions where an interrupt re-enables 4520290811Sjtl * the PMC after this code has already checked 4521290811Sjtl * the pm_stalled flag. 4522290811Sjtl */ 4523290811Sjtl if (CPU_ISSET(cpu, &pm->pm_cpustate)) { 4524290811Sjtl CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate); 4525290811Sjtl if (!CPU_ISSET(cpu, &pm->pm_stalled)) { 4526290811Sjtl (void) pcd->pcd_stop_pmc(cpu, adjri); 4527290811Sjtl pcd->pcd_read_pmc(cpu, adjri, 4528290811Sjtl &newvalue); 4529290811Sjtl tmp = newvalue - 4530290811Sjtl PMC_PCPU_SAVED(cpu,ri); 4531147191Sjkoshy 4532290811Sjtl mtx_pool_lock_spin(pmc_mtxpool, pm); 4533290811Sjtl pm->pm_gv.pm_savedvalue += tmp; 4534290811Sjtl pp->pp_pmcs[ri].pp_pmcval += tmp; 4535290811Sjtl mtx_pool_unlock_spin(pmc_mtxpool, pm); 4536290811Sjtl } 4537147191Sjkoshy } 4538147191Sjkoshy 4539208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount,1); 4540147191Sjkoshy 4541147191Sjkoshy KASSERT((int) pm->pm_runcount >= 0, 4542147191Sjkoshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 4543147191Sjkoshy 4544184802Sjkoshy (void) pcd->pcd_config_pmc(cpu, adjri, NULL); 4545147191Sjkoshy } 4546147191Sjkoshy 4547147191Sjkoshy /* 4548147191Sjkoshy * Inform the MD layer of this pseudo "context switch 4549147191Sjkoshy * out" 4550147191Sjkoshy */ 4551147191Sjkoshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 4552147191Sjkoshy 4553147191Sjkoshy critical_exit(); /* ok to be pre-empted now */ 4554147191Sjkoshy 4555147191Sjkoshy /* 4556147191Sjkoshy * Unlink this process from the PMCs that are 4557298931Spfg * targeting it. This will send a signal to 4558147191Sjkoshy * all PMC owner's whose PMCs are orphaned. 4559147191Sjkoshy * 4560147191Sjkoshy * Log PMC value at exit time if requested. 4561147191Sjkoshy */ 4562147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4563147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 4564147867Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 4565147867Sjkoshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 4566147191Sjkoshy pmclog_process_procexit(pm, pp); 4567147191Sjkoshy pmc_unlink_target_process(pm, pp); 4568147191Sjkoshy } 4569184205Sdes free(pp, M_PMC); 4570147191Sjkoshy 4571147191Sjkoshy } else 4572147191Sjkoshy critical_exit(); /* pp == NULL */ 4573147191Sjkoshy 4574147191Sjkoshy 4575147191Sjkoshy /* 4576147191Sjkoshy * If the process owned PMCs, free them up and free up 4577147191Sjkoshy * memory. 4578147191Sjkoshy */ 4579147191Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 4580147191Sjkoshy pmc_remove_owner(po); 4581147191Sjkoshy pmc_destroy_owner_descriptor(po); 4582145256Sjkoshy } 4583147191Sjkoshy 4584147191Sjkoshy sx_xunlock(&pmc_sx); 4585145256Sjkoshy} 4586145256Sjkoshy 4587145256Sjkoshy/* 4588145256Sjkoshy * Handle a process fork. 4589145256Sjkoshy * 4590145256Sjkoshy * If the parent process 'p1' is under HWPMC monitoring, then copy 4591145256Sjkoshy * over any attached PMCs that have 'do_descendants' semantics. 4592145256Sjkoshy */ 4593145256Sjkoshy 4594145256Sjkoshystatic void 4595147191Sjkoshypmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 4596145256Sjkoshy int flags) 4597145256Sjkoshy{ 4598145256Sjkoshy int is_using_hwpmcs; 4599147191Sjkoshy unsigned int ri; 4600147191Sjkoshy uint32_t do_descendants; 4601147191Sjkoshy struct pmc *pm; 4602147191Sjkoshy struct pmc_owner *po; 4603147191Sjkoshy struct pmc_process *ppnew, *ppold; 4604145256Sjkoshy 4605145256Sjkoshy (void) flags; /* unused parameter */ 4606145256Sjkoshy 4607145256Sjkoshy PROC_LOCK(p1); 4608145256Sjkoshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 4609145256Sjkoshy PROC_UNLOCK(p1); 4610145256Sjkoshy 4611147191Sjkoshy /* 4612147191Sjkoshy * If there are system-wide sampling PMCs active, we need to 4613147191Sjkoshy * log all fork events to their owner's logs. 4614147191Sjkoshy */ 4615147191Sjkoshy 4616147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4617147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4618147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 4619147191Sjkoshy 4620147191Sjkoshy if (!is_using_hwpmcs) 4621147191Sjkoshy return; 4622147191Sjkoshy 4623147191Sjkoshy PMC_GET_SX_XLOCK(); 4624282658Sjhb PMCDBG4(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 4625147191Sjkoshy p1->p_pid, p1->p_comm, newproc); 4626147191Sjkoshy 4627147191Sjkoshy /* 4628147191Sjkoshy * If the parent process (curthread->td_proc) is a 4629147191Sjkoshy * target of any PMCs, look for PMCs that are to be 4630147191Sjkoshy * inherited, and link these into the new process 4631147191Sjkoshy * descriptor. 4632147191Sjkoshy */ 4633147191Sjkoshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 4634147191Sjkoshy PMC_FLAG_NONE)) == NULL) 4635147191Sjkoshy goto done; /* nothing to do */ 4636147191Sjkoshy 4637147191Sjkoshy do_descendants = 0; 4638147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4639147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 4640147191Sjkoshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 4641147191Sjkoshy if (do_descendants == 0) /* nothing to do */ 4642147191Sjkoshy goto done; 4643147191Sjkoshy 4644147191Sjkoshy /* allocate a descriptor for the new process */ 4645147191Sjkoshy if ((ppnew = pmc_find_process_descriptor(newproc, 4646147191Sjkoshy PMC_FLAG_ALLOCATE)) == NULL) 4647147191Sjkoshy goto done; 4648147191Sjkoshy 4649147191Sjkoshy /* 4650147191Sjkoshy * Run through all PMCs that were targeting the old process 4651147191Sjkoshy * and which specified F_DESCENDANTS and attach them to the 4652147191Sjkoshy * new process. 4653147191Sjkoshy * 4654147191Sjkoshy * Log the fork event to all owners of PMCs attached to this 4655147191Sjkoshy * process, if not already logged. 4656147191Sjkoshy */ 4657147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4658147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 4659147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 4660147191Sjkoshy pmc_link_target_process(pm, ppnew); 4661147191Sjkoshy po = pm->pm_owner; 4662147191Sjkoshy if (po->po_sscount == 0 && 4663147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 4664147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, 4665147191Sjkoshy newproc->p_pid); 4666147191Sjkoshy } 4667147191Sjkoshy 4668147191Sjkoshy /* 4669147191Sjkoshy * Now mark the new process as being tracked by this driver. 4670147191Sjkoshy */ 4671147191Sjkoshy PROC_LOCK(newproc); 4672147191Sjkoshy newproc->p_flag |= P_HWPMC; 4673147191Sjkoshy PROC_UNLOCK(newproc); 4674147191Sjkoshy 4675147191Sjkoshy done: 4676147191Sjkoshy sx_xunlock(&pmc_sx); 4677145256Sjkoshy} 4678145256Sjkoshy 4679254813Smarkjstatic void 4680254813Smarkjpmc_kld_load(void *arg __unused, linker_file_t lf) 4681254813Smarkj{ 4682254813Smarkj struct pmc_owner *po; 4683145256Sjkoshy 4684254813Smarkj sx_slock(&pmc_sx); 4685254813Smarkj 4686254813Smarkj /* 4687254813Smarkj * Notify owners of system sampling PMCs about KLD operations. 4688254813Smarkj */ 4689254813Smarkj LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4690254813Smarkj if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4691254813Smarkj pmclog_process_map_in(po, (pid_t) -1, 4692254813Smarkj (uintfptr_t) lf->address, lf->filename); 4693254813Smarkj 4694254813Smarkj /* 4695254813Smarkj * TODO: Notify owners of (all) process-sampling PMCs too. 4696254813Smarkj */ 4697254813Smarkj 4698254813Smarkj sx_sunlock(&pmc_sx); 4699254813Smarkj} 4700254813Smarkj 4701254813Smarkjstatic void 4702254813Smarkjpmc_kld_unload(void *arg __unused, const char *filename __unused, 4703254813Smarkj caddr_t address, size_t size) 4704254813Smarkj{ 4705254813Smarkj struct pmc_owner *po; 4706254813Smarkj 4707254813Smarkj sx_slock(&pmc_sx); 4708254813Smarkj 4709254813Smarkj LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4710254813Smarkj if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4711254813Smarkj pmclog_process_map_out(po, (pid_t) -1, 4712254813Smarkj (uintfptr_t) address, (uintfptr_t) address + size); 4713254813Smarkj 4714254813Smarkj /* 4715254813Smarkj * TODO: Notify owners of process-sampling PMCs. 4716254813Smarkj */ 4717254813Smarkj 4718254813Smarkj sx_sunlock(&pmc_sx); 4719254813Smarkj} 4720254813Smarkj 4721145256Sjkoshy/* 4722145256Sjkoshy * initialization 4723145256Sjkoshy */ 4724283120Sjhbstatic const char * 4725283120Sjhbpmc_name_of_pmcclass(enum pmc_class class) 4726283120Sjhb{ 4727145256Sjkoshy 4728283120Sjhb switch (class) { 4729145256Sjkoshy#undef __PMC_CLASS 4730283120Sjhb#define __PMC_CLASS(S,V,D) \ 4731283120Sjhb case PMC_CLASS_##S: \ 4732283120Sjhb return #S; 4733283120Sjhb __PMC_CLASSES(); 4734283120Sjhb default: 4735283120Sjhb return ("<unknown>"); 4736283120Sjhb } 4737283120Sjhb} 4738145256Sjkoshy 4739233628Sfabient/* 4740233628Sfabient * Base class initializer: allocate structure and set default classes. 4741233628Sfabient */ 4742233628Sfabientstruct pmc_mdep * 4743233628Sfabientpmc_mdep_alloc(int nclasses) 4744233628Sfabient{ 4745233628Sfabient struct pmc_mdep *md; 4746233628Sfabient int n; 4747233628Sfabient 4748233628Sfabient /* SOFT + md classes */ 4749233628Sfabient n = 1 + nclasses; 4750233628Sfabient md = malloc(sizeof(struct pmc_mdep) + n * 4751233628Sfabient sizeof(struct pmc_classdep), M_PMC, M_WAITOK|M_ZERO); 4752250105Sdavide md->pmd_nclass = n; 4753233628Sfabient 4754250105Sdavide /* Add base class. */ 4755250105Sdavide pmc_soft_initialize(md); 4756233628Sfabient return md; 4757233628Sfabient} 4758233628Sfabient 4759233628Sfabientvoid 4760233628Sfabientpmc_mdep_free(struct pmc_mdep *md) 4761233628Sfabient{ 4762233628Sfabient pmc_soft_finalize(md); 4763233628Sfabient free(md, M_PMC); 4764233628Sfabient} 4765233628Sfabient 4766145256Sjkoshystatic int 4767233628Sfabientgeneric_switch_in(struct pmc_cpu *pc, struct pmc_process *pp) 4768233628Sfabient{ 4769233628Sfabient (void) pc; (void) pp; 4770233628Sfabient 4771233628Sfabient return (0); 4772233628Sfabient} 4773233628Sfabient 4774233628Sfabientstatic int 4775233628Sfabientgeneric_switch_out(struct pmc_cpu *pc, struct pmc_process *pp) 4776233628Sfabient{ 4777233628Sfabient (void) pc; (void) pp; 4778233628Sfabient 4779233628Sfabient return (0); 4780233628Sfabient} 4781233628Sfabient 4782233628Sfabientstatic struct pmc_mdep * 4783233628Sfabientpmc_generic_cpu_initialize(void) 4784233628Sfabient{ 4785233628Sfabient struct pmc_mdep *md; 4786233628Sfabient 4787233628Sfabient md = pmc_mdep_alloc(0); 4788233628Sfabient 4789233628Sfabient md->pmd_cputype = PMC_CPU_GENERIC; 4790233628Sfabient 4791233628Sfabient md->pmd_pcpu_init = NULL; 4792233628Sfabient md->pmd_pcpu_fini = NULL; 4793233628Sfabient md->pmd_switch_in = generic_switch_in; 4794233628Sfabient md->pmd_switch_out = generic_switch_out; 4795233628Sfabient 4796233628Sfabient return (md); 4797233628Sfabient} 4798233628Sfabient 4799233628Sfabientstatic void 4800233628Sfabientpmc_generic_cpu_finalize(struct pmc_mdep *md) 4801233628Sfabient{ 4802233628Sfabient (void) md; 4803233628Sfabient} 4804233628Sfabient 4805233628Sfabient 4806233628Sfabientstatic int 4807145256Sjkoshypmc_initialize(void) 4808145256Sjkoshy{ 4809184802Sjkoshy int c, cpu, error, n, ri; 4810183266Sjkoshy unsigned int maxcpu; 4811145256Sjkoshy struct pmc_binding pb; 4812174395Sjkoshy struct pmc_sample *ps; 4813184802Sjkoshy struct pmc_classdep *pcd; 4814147191Sjkoshy struct pmc_samplebuffer *sb; 4815145256Sjkoshy 4816145256Sjkoshy md = NULL; 4817145256Sjkoshy error = 0; 4818145256Sjkoshy 4819282641Sjhb#ifdef HWPMC_DEBUG 4820145256Sjkoshy /* parse debug flags first */ 4821145256Sjkoshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 4822145256Sjkoshy pmc_debugstr, sizeof(pmc_debugstr))) 4823145256Sjkoshy pmc_debugflags_parse(pmc_debugstr, 4824145256Sjkoshy pmc_debugstr+strlen(pmc_debugstr)); 4825145256Sjkoshy#endif 4826145256Sjkoshy 4827282658Sjhb PMCDBG1(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 4828145256Sjkoshy 4829148562Sjkoshy /* check kernel version */ 4830148562Sjkoshy if (pmc_kernel_version != PMC_VERSION) { 4831148562Sjkoshy if (pmc_kernel_version == 0) 4832148562Sjkoshy printf("hwpmc: this kernel has not been compiled with " 4833148562Sjkoshy "'options HWPMC_HOOKS'.\n"); 4834148562Sjkoshy else 4835148562Sjkoshy printf("hwpmc: kernel version (0x%x) does not match " 4836148562Sjkoshy "module version (0x%x).\n", pmc_kernel_version, 4837148562Sjkoshy PMC_VERSION); 4838148562Sjkoshy return EPROGMISMATCH; 4839148562Sjkoshy } 4840148562Sjkoshy 4841145256Sjkoshy /* 4842145256Sjkoshy * check sysctl parameters 4843145256Sjkoshy */ 4844145256Sjkoshy 4845145256Sjkoshy if (pmc_hashsize <= 0) { 4846174395Sjkoshy (void) printf("hwpmc: tunable \"hashsize\"=%d must be " 4847174395Sjkoshy "greater than zero.\n", pmc_hashsize); 4848145256Sjkoshy pmc_hashsize = PMC_HASH_SIZE; 4849145256Sjkoshy } 4850145256Sjkoshy 4851147191Sjkoshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 4852174395Sjkoshy (void) printf("hwpmc: tunable \"nsamples\"=%d out of " 4853174395Sjkoshy "range.\n", pmc_nsamples); 4854147191Sjkoshy pmc_nsamples = PMC_NSAMPLES; 4855147191Sjkoshy } 4856145256Sjkoshy 4857174395Sjkoshy if (pmc_callchaindepth <= 0 || 4858174395Sjkoshy pmc_callchaindepth > PMC_CALLCHAIN_DEPTH_MAX) { 4859174395Sjkoshy (void) printf("hwpmc: tunable \"callchaindepth\"=%d out of " 4860274766Semaste "range - using %d.\n", pmc_callchaindepth, 4861274766Semaste PMC_CALLCHAIN_DEPTH_MAX); 4862274766Semaste pmc_callchaindepth = PMC_CALLCHAIN_DEPTH_MAX; 4863174395Sjkoshy } 4864174395Sjkoshy 4865147191Sjkoshy md = pmc_md_initialize(); 4866233628Sfabient if (md == NULL) { 4867233628Sfabient /* Default to generic CPU. */ 4868233628Sfabient md = pmc_generic_cpu_initialize(); 4869233628Sfabient if (md == NULL) 4870233628Sfabient return (ENOSYS); 4871233628Sfabient } 4872147191Sjkoshy 4873184802Sjkoshy KASSERT(md->pmd_nclass >= 1 && md->pmd_npmc >= 1, 4874184802Sjkoshy ("[pmc,%d] no classes or pmcs", __LINE__)); 4875184802Sjkoshy 4876184802Sjkoshy /* Compute the map from row-indices to classdep pointers. */ 4877184802Sjkoshy pmc_rowindex_to_classdep = malloc(sizeof(struct pmc_classdep *) * 4878184802Sjkoshy md->pmd_npmc, M_PMC, M_WAITOK|M_ZERO); 4879184802Sjkoshy 4880184802Sjkoshy for (n = 0; n < md->pmd_npmc; n++) 4881184802Sjkoshy pmc_rowindex_to_classdep[n] = NULL; 4882184802Sjkoshy for (ri = c = 0; c < md->pmd_nclass; c++) { 4883184802Sjkoshy pcd = &md->pmd_classdep[c]; 4884184802Sjkoshy for (n = 0; n < pcd->pcd_num; n++, ri++) 4885184802Sjkoshy pmc_rowindex_to_classdep[ri] = pcd; 4886184802Sjkoshy } 4887184802Sjkoshy 4888184802Sjkoshy KASSERT(ri == md->pmd_npmc, 4889184802Sjkoshy ("[pmc,%d] npmc miscomputed: ri=%d, md->npmc=%d", __LINE__, 4890184802Sjkoshy ri, md->pmd_npmc)); 4891184802Sjkoshy 4892183266Sjkoshy maxcpu = pmc_cpu_max(); 4893183266Sjkoshy 4894145256Sjkoshy /* allocate space for the per-cpu array */ 4895184802Sjkoshy pmc_pcpu = malloc(maxcpu * sizeof(struct pmc_cpu *), M_PMC, 4896184802Sjkoshy M_WAITOK|M_ZERO); 4897145256Sjkoshy 4898145256Sjkoshy /* per-cpu 'saved values' for managing process-mode PMCs */ 4899184214Sdes pmc_pcpu_saved = malloc(sizeof(pmc_value_t) * maxcpu * md->pmd_npmc, 4900184214Sdes M_PMC, M_WAITOK); 4901145256Sjkoshy 4902183266Sjkoshy /* Perform CPU-dependent initialization. */ 4903145256Sjkoshy pmc_save_cpu_binding(&pb); 4904184802Sjkoshy error = 0; 4905184802Sjkoshy for (cpu = 0; error == 0 && cpu < maxcpu; cpu++) { 4906183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4907145256Sjkoshy continue; 4908145256Sjkoshy pmc_select_cpu(cpu); 4909184802Sjkoshy pmc_pcpu[cpu] = malloc(sizeof(struct pmc_cpu) + 4910184802Sjkoshy md->pmd_npmc * sizeof(struct pmc_hw *), M_PMC, 4911184802Sjkoshy M_WAITOK|M_ZERO); 4912184802Sjkoshy if (md->pmd_pcpu_init) 4913185363Sjkoshy error = md->pmd_pcpu_init(md, cpu); 4914184802Sjkoshy for (n = 0; error == 0 && n < md->pmd_nclass; n++) 4915184802Sjkoshy error = md->pmd_classdep[n].pcd_pcpu_init(md, cpu); 4916145256Sjkoshy } 4917145256Sjkoshy pmc_restore_cpu_binding(&pb); 4918145256Sjkoshy 4919184802Sjkoshy if (error) 4920184802Sjkoshy return (error); 4921145256Sjkoshy 4922147191Sjkoshy /* allocate space for the sample array */ 4923183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 4924183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4925147191Sjkoshy continue; 4926184802Sjkoshy 4927184214Sdes sb = malloc(sizeof(struct pmc_samplebuffer) + 4928147191Sjkoshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4929147191Sjkoshy M_WAITOK|M_ZERO); 4930147191Sjkoshy sb->ps_read = sb->ps_write = sb->ps_samples; 4931153735Sjkoshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4932184802Sjkoshy 4933147191Sjkoshy KASSERT(pmc_pcpu[cpu] != NULL, 4934147191Sjkoshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4935147191Sjkoshy 4936184802Sjkoshy sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples * 4937184802Sjkoshy sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO); 4938174395Sjkoshy 4939174395Sjkoshy for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4940174395Sjkoshy ps->ps_pc = sb->ps_callchains + 4941174395Sjkoshy (n * pmc_callchaindepth); 4942174395Sjkoshy 4943233628Sfabient pmc_pcpu[cpu]->pc_sb[PMC_HR] = sb; 4944233628Sfabient 4945233628Sfabient sb = malloc(sizeof(struct pmc_samplebuffer) + 4946233628Sfabient pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4947233628Sfabient M_WAITOK|M_ZERO); 4948233628Sfabient sb->ps_read = sb->ps_write = sb->ps_samples; 4949233628Sfabient sb->ps_fence = sb->ps_samples + pmc_nsamples; 4950233628Sfabient 4951233628Sfabient KASSERT(pmc_pcpu[cpu] != NULL, 4952233628Sfabient ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4953233628Sfabient 4954233628Sfabient sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples * 4955233628Sfabient sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO); 4956233628Sfabient 4957233628Sfabient for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4958233628Sfabient ps->ps_pc = sb->ps_callchains + 4959233628Sfabient (n * pmc_callchaindepth); 4960233628Sfabient 4961233628Sfabient pmc_pcpu[cpu]->pc_sb[PMC_SR] = sb; 4962147191Sjkoshy } 4963147191Sjkoshy 4964145256Sjkoshy /* allocate space for the row disposition array */ 4965145256Sjkoshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 4966145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4967145256Sjkoshy 4968145256Sjkoshy /* mark all PMCs as available */ 4969145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 4970145256Sjkoshy PMC_MARK_ROW_FREE(n); 4971145256Sjkoshy 4972145256Sjkoshy /* allocate thread hash tables */ 4973145256Sjkoshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 4974145256Sjkoshy &pmc_ownerhashmask); 4975145256Sjkoshy 4976145256Sjkoshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 4977145256Sjkoshy &pmc_processhashmask); 4978168856Sjkoshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc-leaf", 4979168856Sjkoshy MTX_SPIN); 4980145256Sjkoshy 4981147191Sjkoshy LIST_INIT(&pmc_ss_owners); 4982147191Sjkoshy pmc_ss_count = 0; 4983147191Sjkoshy 4984145256Sjkoshy /* allocate a pool of spin mutexes */ 4985168856Sjkoshy pmc_mtxpool = mtx_pool_create("pmc-leaf", pmc_mtxpool_size, 4986168856Sjkoshy MTX_SPIN); 4987145256Sjkoshy 4988282658Sjhb PMCDBG4(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4989145256Sjkoshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4990145256Sjkoshy pmc_processhash, pmc_processhashmask); 4991145256Sjkoshy 4992145256Sjkoshy /* register process {exit,fork,exec} handlers */ 4993145256Sjkoshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4994145256Sjkoshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4995145256Sjkoshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4996145256Sjkoshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4997145256Sjkoshy 4998254813Smarkj /* register kld event handlers */ 4999254813Smarkj pmc_kld_load_tag = EVENTHANDLER_REGISTER(kld_load, pmc_kld_load, 5000254813Smarkj NULL, EVENTHANDLER_PRI_ANY); 5001254813Smarkj pmc_kld_unload_tag = EVENTHANDLER_REGISTER(kld_unload, pmc_kld_unload, 5002254813Smarkj NULL, EVENTHANDLER_PRI_ANY); 5003254813Smarkj 5004147191Sjkoshy /* initialize logging */ 5005147191Sjkoshy pmclog_initialize(); 5006147191Sjkoshy 5007145256Sjkoshy /* set hook functions */ 5008145256Sjkoshy pmc_intr = md->pmd_intr; 5009145256Sjkoshy pmc_hook = pmc_hook_handler; 5010145256Sjkoshy 5011145256Sjkoshy if (error == 0) { 5012145256Sjkoshy printf(PMC_MODULE_NAME ":"); 5013149373Sjkoshy for (n = 0; n < (int) md->pmd_nclass; n++) { 5014184802Sjkoshy pcd = &md->pmd_classdep[n]; 5015184997Sjkoshy printf(" %s/%d/%d/0x%b", 5016283120Sjhb pmc_name_of_pmcclass(pcd->pcd_class), 5017184802Sjkoshy pcd->pcd_num, 5018184997Sjkoshy pcd->pcd_width, 5019184802Sjkoshy pcd->pcd_caps, 5020149373Sjkoshy "\20" 5021149373Sjkoshy "\1INT\2USR\3SYS\4EDG\5THR" 5022149373Sjkoshy "\6REA\7WRI\10INV\11QUA\12PRC" 5023149373Sjkoshy "\13TAG\14CSC"); 5024149373Sjkoshy } 5025145256Sjkoshy printf("\n"); 5026145256Sjkoshy } 5027145256Sjkoshy 5028184802Sjkoshy return (error); 5029145256Sjkoshy} 5030145256Sjkoshy 5031145256Sjkoshy/* prepare to be unloaded */ 5032145256Sjkoshystatic void 5033145256Sjkoshypmc_cleanup(void) 5034145256Sjkoshy{ 5035184802Sjkoshy int c, cpu; 5036183266Sjkoshy unsigned int maxcpu; 5037145256Sjkoshy struct pmc_ownerhash *ph; 5038145256Sjkoshy struct pmc_owner *po, *tmp; 5039145256Sjkoshy struct pmc_binding pb; 5040282641Sjhb#ifdef HWPMC_DEBUG 5041145256Sjkoshy struct pmc_processhash *prh; 5042145256Sjkoshy#endif 5043145256Sjkoshy 5044282658Sjhb PMCDBG0(MOD,INI,0, "cleanup"); 5045145256Sjkoshy 5046147191Sjkoshy /* switch off sampling */ 5047222813Sattilio CPU_ZERO(&pmc_cpumask); 5048147191Sjkoshy pmc_intr = NULL; 5049145256Sjkoshy 5050145256Sjkoshy sx_xlock(&pmc_sx); 5051145256Sjkoshy if (pmc_hook == NULL) { /* being unloaded already */ 5052145256Sjkoshy sx_xunlock(&pmc_sx); 5053145256Sjkoshy return; 5054145256Sjkoshy } 5055145256Sjkoshy 5056145256Sjkoshy pmc_hook = NULL; /* prevent new threads from entering module */ 5057145256Sjkoshy 5058145256Sjkoshy /* deregister event handlers */ 5059145256Sjkoshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 5060145256Sjkoshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 5061254813Smarkj EVENTHANDLER_DEREGISTER(kld_load, pmc_kld_load_tag); 5062254813Smarkj EVENTHANDLER_DEREGISTER(kld_unload, pmc_kld_unload_tag); 5063145256Sjkoshy 5064145256Sjkoshy /* send SIGBUS to all owner threads, free up allocations */ 5065145256Sjkoshy if (pmc_ownerhash) 5066145256Sjkoshy for (ph = pmc_ownerhash; 5067145256Sjkoshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 5068145256Sjkoshy ph++) { 5069145256Sjkoshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 5070145256Sjkoshy pmc_remove_owner(po); 5071145256Sjkoshy 5072145256Sjkoshy /* send SIGBUS to owner processes */ 5073282658Sjhb PMCDBG3(MOD,INI,2, "cleanup signal proc=%p " 5074145256Sjkoshy "(%d, %s)", po->po_owner, 5075145256Sjkoshy po->po_owner->p_pid, 5076145256Sjkoshy po->po_owner->p_comm); 5077145256Sjkoshy 5078145256Sjkoshy PROC_LOCK(po->po_owner); 5079225617Skmacy kern_psignal(po->po_owner, SIGBUS); 5080145256Sjkoshy PROC_UNLOCK(po->po_owner); 5081147191Sjkoshy 5082147191Sjkoshy pmc_destroy_owner_descriptor(po); 5083145256Sjkoshy } 5084145256Sjkoshy } 5085145256Sjkoshy 5086145256Sjkoshy /* reclaim allocated data structures */ 5087145256Sjkoshy if (pmc_mtxpool) 5088145256Sjkoshy mtx_pool_destroy(&pmc_mtxpool); 5089145256Sjkoshy 5090145256Sjkoshy mtx_destroy(&pmc_processhash_mtx); 5091145256Sjkoshy if (pmc_processhash) { 5092282641Sjhb#ifdef HWPMC_DEBUG 5093145256Sjkoshy struct pmc_process *pp; 5094145256Sjkoshy 5095282658Sjhb PMCDBG0(MOD,INI,3, "destroy process hash"); 5096145256Sjkoshy for (prh = pmc_processhash; 5097145256Sjkoshy prh <= &pmc_processhash[pmc_processhashmask]; 5098145256Sjkoshy prh++) 5099145256Sjkoshy LIST_FOREACH(pp, prh, pp_next) 5100282658Sjhb PMCDBG1(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 5101145256Sjkoshy#endif 5102145256Sjkoshy 5103145256Sjkoshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 5104145256Sjkoshy pmc_processhash = NULL; 5105145256Sjkoshy } 5106145256Sjkoshy 5107145256Sjkoshy if (pmc_ownerhash) { 5108282658Sjhb PMCDBG0(MOD,INI,3, "destroy owner hash"); 5109145256Sjkoshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 5110145256Sjkoshy pmc_ownerhash = NULL; 5111145256Sjkoshy } 5112145256Sjkoshy 5113147191Sjkoshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 5114147191Sjkoshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 5115147191Sjkoshy KASSERT(pmc_ss_count == 0, 5116147191Sjkoshy ("[pmc,%d] Global SS count not empty", __LINE__)); 5117147191Sjkoshy 5118184802Sjkoshy /* do processor and pmc-class dependent cleanup */ 5119183266Sjkoshy maxcpu = pmc_cpu_max(); 5120153735Sjkoshy 5121282658Sjhb PMCDBG0(MOD,INI,3, "md cleanup"); 5122145256Sjkoshy if (md) { 5123145256Sjkoshy pmc_save_cpu_binding(&pb); 5124183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 5125282658Sjhb PMCDBG2(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 5126145256Sjkoshy cpu, pmc_pcpu[cpu]); 5127183266Sjkoshy if (!pmc_cpu_is_active(cpu) || pmc_pcpu[cpu] == NULL) 5128145256Sjkoshy continue; 5129145256Sjkoshy pmc_select_cpu(cpu); 5130184802Sjkoshy for (c = 0; c < md->pmd_nclass; c++) 5131184802Sjkoshy md->pmd_classdep[c].pcd_pcpu_fini(md, cpu); 5132184802Sjkoshy if (md->pmd_pcpu_fini) 5133185363Sjkoshy md->pmd_pcpu_fini(md, cpu); 5134145256Sjkoshy } 5135184994Sjkoshy 5136233628Sfabient if (md->pmd_cputype == PMC_CPU_GENERIC) 5137233628Sfabient pmc_generic_cpu_finalize(md); 5138233628Sfabient else 5139233628Sfabient pmc_md_finalize(md); 5140184994Sjkoshy 5141233628Sfabient pmc_mdep_free(md); 5142145256Sjkoshy md = NULL; 5143145256Sjkoshy pmc_restore_cpu_binding(&pb); 5144145256Sjkoshy } 5145145256Sjkoshy 5146184802Sjkoshy /* Free per-cpu descriptors. */ 5147184802Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 5148184802Sjkoshy if (!pmc_cpu_is_active(cpu)) 5149184802Sjkoshy continue; 5150233628Sfabient KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_HR] != NULL, 5151233628Sfabient ("[pmc,%d] Null hw cpu sample buffer cpu=%d", __LINE__, 5152184802Sjkoshy cpu)); 5153233628Sfabient KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_SR] != NULL, 5154233628Sfabient ("[pmc,%d] Null sw cpu sample buffer cpu=%d", __LINE__, 5155233628Sfabient cpu)); 5156233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_HR]->ps_callchains, M_PMC); 5157233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_HR], M_PMC); 5158233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_SR]->ps_callchains, M_PMC); 5159233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_SR], M_PMC); 5160184802Sjkoshy free(pmc_pcpu[cpu], M_PMC); 5161184802Sjkoshy } 5162184802Sjkoshy 5163184205Sdes free(pmc_pcpu, M_PMC); 5164145256Sjkoshy pmc_pcpu = NULL; 5165145256Sjkoshy 5166184205Sdes free(pmc_pcpu_saved, M_PMC); 5167145256Sjkoshy pmc_pcpu_saved = NULL; 5168145256Sjkoshy 5169145256Sjkoshy if (pmc_pmcdisp) { 5170184205Sdes free(pmc_pmcdisp, M_PMC); 5171145256Sjkoshy pmc_pmcdisp = NULL; 5172145256Sjkoshy } 5173145256Sjkoshy 5174184802Sjkoshy if (pmc_rowindex_to_classdep) { 5175184802Sjkoshy free(pmc_rowindex_to_classdep, M_PMC); 5176184802Sjkoshy pmc_rowindex_to_classdep = NULL; 5177184802Sjkoshy } 5178184802Sjkoshy 5179147191Sjkoshy pmclog_shutdown(); 5180147191Sjkoshy 5181145256Sjkoshy sx_xunlock(&pmc_sx); /* we are done */ 5182145256Sjkoshy} 5183145256Sjkoshy 5184145256Sjkoshy/* 5185145256Sjkoshy * The function called at load/unload. 5186145256Sjkoshy */ 5187145256Sjkoshy 5188145256Sjkoshystatic int 5189145256Sjkoshyload (struct module *module __unused, int cmd, void *arg __unused) 5190145256Sjkoshy{ 5191145256Sjkoshy int error; 5192145256Sjkoshy 5193145256Sjkoshy error = 0; 5194145256Sjkoshy 5195145256Sjkoshy switch (cmd) { 5196145256Sjkoshy case MOD_LOAD : 5197145256Sjkoshy /* initialize the subsystem */ 5198145256Sjkoshy error = pmc_initialize(); 5199145256Sjkoshy if (error != 0) 5200145256Sjkoshy break; 5201282658Sjhb PMCDBG2(MOD,INI,1, "syscall=%d maxcpu=%d", 5202183266Sjkoshy pmc_syscall_num, pmc_cpu_max()); 5203145256Sjkoshy break; 5204145256Sjkoshy 5205145256Sjkoshy 5206145256Sjkoshy case MOD_UNLOAD : 5207145256Sjkoshy case MOD_SHUTDOWN: 5208145256Sjkoshy pmc_cleanup(); 5209282658Sjhb PMCDBG0(MOD,INI,1, "unloaded"); 5210145256Sjkoshy break; 5211145256Sjkoshy 5212145256Sjkoshy default : 5213145256Sjkoshy error = EINVAL; /* XXX should panic(9) */ 5214145256Sjkoshy break; 5215145256Sjkoshy } 5216145256Sjkoshy 5217145256Sjkoshy return error; 5218145256Sjkoshy} 5219145256Sjkoshy 5220145256Sjkoshy/* memory pool */ 5221145256SjkoshyMALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 5222