hwpmc_mod.c revision 233628
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: head/sys/dev/hwpmc/hwpmc_mod.c 233628 2012-03-28 20:58:30Z fabient $"); 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> 53145256Sjkoshy#include <sys/sched.h> 54145256Sjkoshy#include <sys/signalvar.h> 55145256Sjkoshy#include <sys/smp.h> 56145256Sjkoshy#include <sys/sx.h> 57145256Sjkoshy#include <sys/sysctl.h> 58145256Sjkoshy#include <sys/sysent.h> 59145256Sjkoshy#include <sys/systm.h> 60147191Sjkoshy#include <sys/vnode.h> 61145256Sjkoshy 62157144Sjkoshy#include <sys/linker.h> /* needs to be after <sys/malloc.h> */ 63157144Sjkoshy 64147191Sjkoshy#include <machine/atomic.h> 65145256Sjkoshy#include <machine/md_var.h> 66145256Sjkoshy 67201021Sjkoshy#include <vm/vm.h> 68201021Sjkoshy#include <vm/vm_extern.h> 69201021Sjkoshy#include <vm/pmap.h> 70201021Sjkoshy#include <vm/vm_map.h> 71201021Sjkoshy#include <vm/vm_object.h> 72201021Sjkoshy 73233628Sfabient#include "hwpmc_soft.h" 74233628Sfabient 75145256Sjkoshy/* 76145256Sjkoshy * Types 77145256Sjkoshy */ 78145256Sjkoshy 79145256Sjkoshyenum pmc_flags { 80145256Sjkoshy PMC_FLAG_NONE = 0x00, /* do nothing */ 81145256Sjkoshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 82145256Sjkoshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 83145256Sjkoshy}; 84145256Sjkoshy 85145256Sjkoshy/* 86145256Sjkoshy * The offset in sysent where the syscall is allocated. 87145256Sjkoshy */ 88145256Sjkoshy 89145256Sjkoshystatic int pmc_syscall_num = NO_SYSCALL; 90145256Sjkoshystruct pmc_cpu **pmc_pcpu; /* per-cpu state */ 91145256Sjkoshypmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 92145256Sjkoshy 93145256Sjkoshy#define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 94145256Sjkoshy 95145256Sjkoshystruct mtx_pool *pmc_mtxpool; 96145256Sjkoshystatic int *pmc_pmcdisp; /* PMC row dispositions */ 97145256Sjkoshy 98145256Sjkoshy#define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 99145256Sjkoshy#define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 100145256Sjkoshy#define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 101145256Sjkoshy 102145256Sjkoshy#define PMC_MARK_ROW_FREE(R) do { \ 103145256Sjkoshy pmc_pmcdisp[(R)] = 0; \ 104145256Sjkoshy} while (0) 105145256Sjkoshy 106145256Sjkoshy#define PMC_MARK_ROW_STANDALONE(R) do { \ 107145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 108145256Sjkoshy __LINE__)); \ 109145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 110183266Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= (-pmc_cpu_max_active()), \ 111183266Sjkoshy ("[pmc,%d] row disposition error", __LINE__)); \ 112145256Sjkoshy} while (0) 113145256Sjkoshy 114145256Sjkoshy#define PMC_UNMARK_ROW_STANDALONE(R) do { \ 115145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 116145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 117145256Sjkoshy __LINE__)); \ 118145256Sjkoshy} while (0) 119145256Sjkoshy 120145256Sjkoshy#define PMC_MARK_ROW_THREAD(R) do { \ 121145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 122145256Sjkoshy __LINE__)); \ 123145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 124145256Sjkoshy} while (0) 125145256Sjkoshy 126145256Sjkoshy#define PMC_UNMARK_ROW_THREAD(R) do { \ 127145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 128145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 129145256Sjkoshy __LINE__)); \ 130145256Sjkoshy} while (0) 131145256Sjkoshy 132145256Sjkoshy 133145256Sjkoshy/* various event handlers */ 134145256Sjkoshystatic eventhandler_tag pmc_exit_tag, pmc_fork_tag; 135145256Sjkoshy 136145256Sjkoshy/* Module statistics */ 137145256Sjkoshystruct pmc_op_getdriverstats pmc_stats; 138145256Sjkoshy 139145256Sjkoshy/* Machine/processor dependent operations */ 140185363Sjkoshystatic struct pmc_mdep *md; 141145256Sjkoshy 142145256Sjkoshy/* 143145256Sjkoshy * Hash tables mapping owner processes and target threads to PMCs. 144145256Sjkoshy */ 145145256Sjkoshy 146145256Sjkoshystruct mtx pmc_processhash_mtx; /* spin mutex */ 147145256Sjkoshystatic u_long pmc_processhashmask; 148145256Sjkoshystatic LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 149145256Sjkoshy 150145256Sjkoshy/* 151145256Sjkoshy * Hash table of PMC owner descriptors. This table is protected by 152145256Sjkoshy * the shared PMC "sx" lock. 153145256Sjkoshy */ 154145256Sjkoshy 155145256Sjkoshystatic u_long pmc_ownerhashmask; 156145256Sjkoshystatic LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 157145256Sjkoshy 158145256Sjkoshy/* 159147191Sjkoshy * List of PMC owners with system-wide sampling PMCs. 160147191Sjkoshy */ 161147191Sjkoshy 162147191Sjkoshystatic LIST_HEAD(, pmc_owner) pmc_ss_owners; 163147191Sjkoshy 164147191Sjkoshy 165147191Sjkoshy/* 166184802Sjkoshy * A map of row indices to classdep structures. 167184802Sjkoshy */ 168184802Sjkoshystatic struct pmc_classdep **pmc_rowindex_to_classdep; 169184802Sjkoshy 170184802Sjkoshy/* 171145256Sjkoshy * Prototypes 172145256Sjkoshy */ 173145256Sjkoshy 174153110Sru#ifdef DEBUG 175145256Sjkoshystatic int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 176145256Sjkoshystatic int pmc_debugflags_parse(char *newstr, char *fence); 177145256Sjkoshy#endif 178145256Sjkoshy 179145256Sjkoshystatic int load(struct module *module, int cmd, void *arg); 180147191Sjkoshystatic int pmc_attach_process(struct proc *p, struct pmc *pm); 181145256Sjkoshystatic struct pmc *pmc_allocate_pmc_descriptor(void); 182147191Sjkoshystatic struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 183147191Sjkoshystatic int pmc_attach_one_process(struct proc *p, struct pmc *pm); 184147191Sjkoshystatic int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 185147191Sjkoshy int cpu); 186147191Sjkoshystatic int pmc_can_attach(struct pmc *pm, struct proc *p); 187233628Sfabientstatic void pmc_capture_user_callchain(int cpu, int soft, struct trapframe *tf); 188147191Sjkoshystatic void pmc_cleanup(void); 189147191Sjkoshystatic int pmc_detach_process(struct proc *p, struct pmc *pm); 190147191Sjkoshystatic int pmc_detach_one_process(struct proc *p, struct pmc *pm, 191147191Sjkoshy int flags); 192147191Sjkoshystatic void pmc_destroy_owner_descriptor(struct pmc_owner *po); 193147191Sjkoshystatic struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 194147191Sjkoshystatic int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 195145256Sjkoshystatic struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 196145256Sjkoshy pmc_id_t pmc); 197145256Sjkoshystatic struct pmc_process *pmc_find_process_descriptor(struct proc *p, 198145256Sjkoshy uint32_t mode); 199145774Sjkoshystatic void pmc_force_context_switch(void); 200145256Sjkoshystatic void pmc_link_target_process(struct pmc *pm, 201145256Sjkoshy struct pmc_process *pp); 202174395Sjkoshystatic void pmc_log_all_process_mappings(struct pmc_owner *po); 203174395Sjkoshystatic void pmc_log_kernel_mappings(struct pmc *pm); 204174395Sjkoshystatic void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p); 205147191Sjkoshystatic void pmc_maybe_remove_owner(struct pmc_owner *po); 206147191Sjkoshystatic void pmc_process_csw_in(struct thread *td); 207147191Sjkoshystatic void pmc_process_csw_out(struct thread *td); 208145256Sjkoshystatic void pmc_process_exit(void *arg, struct proc *p); 209145256Sjkoshystatic void pmc_process_fork(void *arg, struct proc *p1, 210145256Sjkoshy struct proc *p2, int n); 211233628Sfabientstatic void pmc_process_samples(int cpu, int soft); 212147191Sjkoshystatic void pmc_release_pmc_descriptor(struct pmc *pmc); 213147191Sjkoshystatic void pmc_remove_owner(struct pmc_owner *po); 214147191Sjkoshystatic void pmc_remove_process_descriptor(struct pmc_process *pp); 215147191Sjkoshystatic void pmc_restore_cpu_binding(struct pmc_binding *pb); 216147191Sjkoshystatic void pmc_save_cpu_binding(struct pmc_binding *pb); 217147191Sjkoshystatic void pmc_select_cpu(int cpu); 218145256Sjkoshystatic int pmc_start(struct pmc *pm); 219145256Sjkoshystatic int pmc_stop(struct pmc *pm); 220147191Sjkoshystatic int pmc_syscall_handler(struct thread *td, void *syscall_args); 221147191Sjkoshystatic void pmc_unlink_target_process(struct pmc *pmc, 222147191Sjkoshy struct pmc_process *pp); 223233628Sfabientstatic int generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp); 224233628Sfabientstatic int generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp); 225233628Sfabientstatic struct pmc_mdep *pmc_generic_cpu_initialize(void); 226233628Sfabientstatic void pmc_generic_cpu_finalize(struct pmc_mdep *md); 227145256Sjkoshy 228145256Sjkoshy/* 229145256Sjkoshy * Kernel tunables and sysctl(8) interface. 230145256Sjkoshy */ 231145256Sjkoshy 232233628SfabientSYSCTL_DECL(_kern_hwpmc); 233145256Sjkoshy 234174395Sjkoshystatic int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 235174395SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "callchaindepth", &pmc_callchaindepth); 236174395SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_TUN|CTLFLAG_RD, 237174395Sjkoshy &pmc_callchaindepth, 0, "depth of call chain records"); 238174395Sjkoshy 239153110Sru#ifdef DEBUG 240147191Sjkoshystruct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 241145256Sjkoshychar pmc_debugstr[PMC_DEBUG_STRSIZE]; 242145256SjkoshyTUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 243145256Sjkoshy sizeof(pmc_debugstr)); 244145256SjkoshySYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 245145256Sjkoshy CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN, 246145256Sjkoshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 247145256Sjkoshy#endif 248145256Sjkoshy 249145256Sjkoshy/* 250147191Sjkoshy * kern.hwpmc.hashrows -- determines the number of rows in the 251145256Sjkoshy * of the hash table used to look up threads 252145256Sjkoshy */ 253145256Sjkoshy 254145256Sjkoshystatic int pmc_hashsize = PMC_HASH_SIZE; 255145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize); 256145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD, 257145256Sjkoshy &pmc_hashsize, 0, "rows in hash tables"); 258145256Sjkoshy 259145256Sjkoshy/* 260174395Sjkoshy * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU 261145256Sjkoshy */ 262145256Sjkoshy 263147191Sjkoshystatic int pmc_nsamples = PMC_NSAMPLES; 264147191SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nsamples", &pmc_nsamples); 265147191SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_TUN|CTLFLAG_RD, 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; 274145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size); 275145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD, 276145256Sjkoshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 277145256Sjkoshy 278145256Sjkoshy 279145256Sjkoshy/* 280145256Sjkoshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 281145256Sjkoshy * allocate system-wide PMCs. 282145256Sjkoshy * 283145256Sjkoshy * Allowing unprivileged processes to allocate system PMCs is convenient 284145256Sjkoshy * if system-wide measurements need to be taken concurrently with other 285145256Sjkoshy * per-process measurements. This feature is turned off by default. 286145256Sjkoshy */ 287145256Sjkoshy 288145256Sjkoshystatic int pmc_unprivileged_syspmcs = 0; 289145256SjkoshyTUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs); 290145256SjkoshySYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW, 291145256Sjkoshy &pmc_unprivileged_syspmcs, 0, 292145256Sjkoshy "allow unprivileged process to allocate system PMCs"); 293145256Sjkoshy 294147191Sjkoshy/* 295147191Sjkoshy * Hash function. Discard the lower 2 bits of the pointer since 296147191Sjkoshy * these are always zero for our uses. The hash multiplier is 297147191Sjkoshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 298147191Sjkoshy */ 299145256Sjkoshy 300145256Sjkoshy#if LONG_BIT == 64 301145256Sjkoshy#define _PMC_HM 11400714819323198486u 302145256Sjkoshy#elif LONG_BIT == 32 303145256Sjkoshy#define _PMC_HM 2654435769u 304145256Sjkoshy#else 305145256Sjkoshy#error Must know the size of 'long' to compile 306145256Sjkoshy#endif 307145256Sjkoshy 308145256Sjkoshy#define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 309145256Sjkoshy 310145256Sjkoshy/* 311145256Sjkoshy * Syscall structures 312145256Sjkoshy */ 313145256Sjkoshy 314145256Sjkoshy/* The `sysent' for the new syscall */ 315145256Sjkoshystatic struct sysent pmc_sysent = { 316145256Sjkoshy 2, /* sy_narg */ 317145256Sjkoshy pmc_syscall_handler /* sy_call */ 318145256Sjkoshy}; 319145256Sjkoshy 320145256Sjkoshystatic struct syscall_module_data pmc_syscall_mod = { 321145256Sjkoshy load, 322145256Sjkoshy NULL, 323145256Sjkoshy &pmc_syscall_num, 324145256Sjkoshy &pmc_sysent, 325145256Sjkoshy { 0, NULL } 326145256Sjkoshy}; 327145256Sjkoshy 328145256Sjkoshystatic moduledata_t pmc_mod = { 329145256Sjkoshy PMC_MODULE_NAME, 330145256Sjkoshy syscall_module_handler, 331145256Sjkoshy &pmc_syscall_mod 332145256Sjkoshy}; 333145256Sjkoshy 334145256SjkoshyDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 335145256SjkoshyMODULE_VERSION(pmc, PMC_VERSION); 336145256Sjkoshy 337153110Sru#ifdef DEBUG 338147191Sjkoshyenum pmc_dbgparse_state { 339147191Sjkoshy PMCDS_WS, /* in whitespace */ 340147191Sjkoshy PMCDS_MAJOR, /* seen a major keyword */ 341147191Sjkoshy PMCDS_MINOR 342147191Sjkoshy}; 343147191Sjkoshy 344145256Sjkoshystatic int 345145256Sjkoshypmc_debugflags_parse(char *newstr, char *fence) 346145256Sjkoshy{ 347145313Sjkoshy char c, *p, *q; 348147191Sjkoshy struct pmc_debugflags *tmpflags; 349147191Sjkoshy int error, found, *newbits, tmp; 350147191Sjkoshy size_t kwlen; 351145256Sjkoshy 352184214Sdes tmpflags = malloc(sizeof(*tmpflags), M_PMC, M_WAITOK|M_ZERO); 353145256Sjkoshy 354145256Sjkoshy p = newstr; 355147191Sjkoshy error = 0; 356145256Sjkoshy 357147191Sjkoshy for (; p < fence && (c = *p); p++) { 358145256Sjkoshy 359147191Sjkoshy /* skip white space */ 360147191Sjkoshy if (c == ' ' || c == '\t') 361147191Sjkoshy continue; 362147191Sjkoshy 363147191Sjkoshy /* look for a keyword followed by "=" */ 364147191Sjkoshy for (q = p; p < fence && (c = *p) && c != '='; p++) 365147191Sjkoshy ; 366147191Sjkoshy if (c != '=') { 367147191Sjkoshy error = EINVAL; 368147191Sjkoshy goto done; 369145256Sjkoshy } 370145256Sjkoshy 371147191Sjkoshy kwlen = p - q; 372147191Sjkoshy newbits = NULL; 373145256Sjkoshy 374147191Sjkoshy /* lookup flag group name */ 375147191Sjkoshy#define DBG_SET_FLAG_MAJ(S,F) \ 376147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 377147191Sjkoshy newbits = &tmpflags->pdb_ ## F; 378145256Sjkoshy 379147191Sjkoshy DBG_SET_FLAG_MAJ("cpu", CPU); 380147191Sjkoshy DBG_SET_FLAG_MAJ("csw", CSW); 381147191Sjkoshy DBG_SET_FLAG_MAJ("logging", LOG); 382147191Sjkoshy DBG_SET_FLAG_MAJ("module", MOD); 383147191Sjkoshy DBG_SET_FLAG_MAJ("md", MDP); 384147191Sjkoshy DBG_SET_FLAG_MAJ("owner", OWN); 385147191Sjkoshy DBG_SET_FLAG_MAJ("pmc", PMC); 386147191Sjkoshy DBG_SET_FLAG_MAJ("process", PRC); 387147191Sjkoshy DBG_SET_FLAG_MAJ("sampling", SAM); 388145256Sjkoshy 389147191Sjkoshy if (newbits == NULL) { 390147191Sjkoshy error = EINVAL; 391147191Sjkoshy goto done; 392145256Sjkoshy } 393145256Sjkoshy 394147191Sjkoshy p++; /* skip the '=' */ 395145256Sjkoshy 396147191Sjkoshy /* Now parse the individual flags */ 397147191Sjkoshy tmp = 0; 398147191Sjkoshy newflag: 399147191Sjkoshy for (q = p; p < fence && (c = *p); p++) 400147191Sjkoshy if (c == ' ' || c == '\t' || c == ',') 401147191Sjkoshy break; 402147191Sjkoshy 403147191Sjkoshy /* p == fence or c == ws or c == "," or c == 0 */ 404147191Sjkoshy 405147191Sjkoshy if ((kwlen = p - q) == 0) { 406147191Sjkoshy *newbits = tmp; 407147191Sjkoshy continue; 408147191Sjkoshy } 409147191Sjkoshy 410147191Sjkoshy found = 0; 411147191Sjkoshy#define DBG_SET_FLAG_MIN(S,F) \ 412147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 413147191Sjkoshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 414147191Sjkoshy 415147191Sjkoshy /* a '*' denotes all possible flags in the group */ 416147191Sjkoshy if (kwlen == 1 && *q == '*') 417147191Sjkoshy tmp = found = ~0; 418147191Sjkoshy /* look for individual flag names */ 419147191Sjkoshy DBG_SET_FLAG_MIN("allocaterow", ALR); 420147191Sjkoshy DBG_SET_FLAG_MIN("allocate", ALL); 421147191Sjkoshy DBG_SET_FLAG_MIN("attach", ATT); 422147191Sjkoshy DBG_SET_FLAG_MIN("bind", BND); 423147191Sjkoshy DBG_SET_FLAG_MIN("config", CFG); 424147191Sjkoshy DBG_SET_FLAG_MIN("exec", EXC); 425147191Sjkoshy DBG_SET_FLAG_MIN("exit", EXT); 426147191Sjkoshy DBG_SET_FLAG_MIN("find", FND); 427147191Sjkoshy DBG_SET_FLAG_MIN("flush", FLS); 428147191Sjkoshy DBG_SET_FLAG_MIN("fork", FRK); 429147191Sjkoshy DBG_SET_FLAG_MIN("getbuf", GTB); 430147191Sjkoshy DBG_SET_FLAG_MIN("hook", PMH); 431147191Sjkoshy DBG_SET_FLAG_MIN("init", INI); 432147191Sjkoshy DBG_SET_FLAG_MIN("intr", INT); 433147191Sjkoshy DBG_SET_FLAG_MIN("linktarget", TLK); 434147191Sjkoshy DBG_SET_FLAG_MIN("mayberemove", OMR); 435147191Sjkoshy DBG_SET_FLAG_MIN("ops", OPS); 436147191Sjkoshy DBG_SET_FLAG_MIN("read", REA); 437147191Sjkoshy DBG_SET_FLAG_MIN("register", REG); 438147191Sjkoshy DBG_SET_FLAG_MIN("release", REL); 439147191Sjkoshy DBG_SET_FLAG_MIN("remove", ORM); 440147191Sjkoshy DBG_SET_FLAG_MIN("sample", SAM); 441147191Sjkoshy DBG_SET_FLAG_MIN("scheduleio", SIO); 442147191Sjkoshy DBG_SET_FLAG_MIN("select", SEL); 443147191Sjkoshy DBG_SET_FLAG_MIN("signal", SIG); 444147191Sjkoshy DBG_SET_FLAG_MIN("swi", SWI); 445147191Sjkoshy DBG_SET_FLAG_MIN("swo", SWO); 446147191Sjkoshy DBG_SET_FLAG_MIN("start", STA); 447147191Sjkoshy DBG_SET_FLAG_MIN("stop", STO); 448147191Sjkoshy DBG_SET_FLAG_MIN("syscall", PMS); 449147191Sjkoshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 450147191Sjkoshy DBG_SET_FLAG_MIN("write", WRI); 451147191Sjkoshy if (found == 0) { 452147191Sjkoshy /* unrecognized flag name */ 453147191Sjkoshy error = EINVAL; 454147191Sjkoshy goto done; 455147191Sjkoshy } 456147191Sjkoshy 457147191Sjkoshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 458147191Sjkoshy *newbits = tmp; 459147191Sjkoshy continue; 460147191Sjkoshy } 461147191Sjkoshy 462147191Sjkoshy p++; 463147191Sjkoshy goto newflag; 464145256Sjkoshy } 465145256Sjkoshy 466147191Sjkoshy /* save the new flag set */ 467147191Sjkoshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 468145256Sjkoshy 469147191Sjkoshy done: 470184205Sdes free(tmpflags, M_PMC); 471147191Sjkoshy return error; 472145256Sjkoshy} 473145256Sjkoshy 474145256Sjkoshystatic int 475145256Sjkoshypmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 476145256Sjkoshy{ 477145256Sjkoshy char *fence, *newstr; 478145256Sjkoshy int error; 479145256Sjkoshy unsigned int n; 480145256Sjkoshy 481145256Sjkoshy (void) arg1; (void) arg2; /* unused parameters */ 482145256Sjkoshy 483145256Sjkoshy n = sizeof(pmc_debugstr); 484184802Sjkoshy newstr = malloc(n, M_PMC, M_WAITOK|M_ZERO); 485147191Sjkoshy (void) strlcpy(newstr, pmc_debugstr, n); 486145256Sjkoshy 487145256Sjkoshy error = sysctl_handle_string(oidp, newstr, n, req); 488145256Sjkoshy 489145256Sjkoshy /* if there is a new string, parse and copy it */ 490145256Sjkoshy if (error == 0 && req->newptr != NULL) { 491147191Sjkoshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 492145256Sjkoshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 493145256Sjkoshy (void) strlcpy(pmc_debugstr, newstr, 494145256Sjkoshy sizeof(pmc_debugstr)); 495145256Sjkoshy } 496145256Sjkoshy 497184205Sdes free(newstr, M_PMC); 498145256Sjkoshy 499145256Sjkoshy return error; 500145256Sjkoshy} 501145256Sjkoshy#endif 502145256Sjkoshy 503145256Sjkoshy/* 504184802Sjkoshy * Map a row index to a classdep structure and return the adjusted row 505184802Sjkoshy * index for the PMC class index. 506184802Sjkoshy */ 507184802Sjkoshystatic struct pmc_classdep * 508184802Sjkoshypmc_ri_to_classdep(struct pmc_mdep *md, int ri, int *adjri) 509184802Sjkoshy{ 510184802Sjkoshy struct pmc_classdep *pcd; 511184802Sjkoshy 512184802Sjkoshy (void) md; 513184802Sjkoshy 514184802Sjkoshy KASSERT(ri >= 0 && ri < md->pmd_npmc, 515184802Sjkoshy ("[pmc,%d] illegal row-index %d", __LINE__, ri)); 516184802Sjkoshy 517184802Sjkoshy pcd = pmc_rowindex_to_classdep[ri]; 518184802Sjkoshy 519184802Sjkoshy KASSERT(pcd != NULL, 520198204Srpaulo ("[pmc,%d] ri %d null pcd", __LINE__, ri)); 521184802Sjkoshy 522184802Sjkoshy *adjri = ri - pcd->pcd_ri; 523184802Sjkoshy 524184802Sjkoshy KASSERT(*adjri >= 0 && *adjri < pcd->pcd_num, 525184802Sjkoshy ("[pmc,%d] adjusted row-index %d", __LINE__, *adjri)); 526184802Sjkoshy 527184802Sjkoshy return (pcd); 528184802Sjkoshy} 529184802Sjkoshy 530184802Sjkoshy/* 531145256Sjkoshy * Concurrency Control 532145256Sjkoshy * 533145256Sjkoshy * The driver manages the following data structures: 534145256Sjkoshy * 535145256Sjkoshy * - target process descriptors, one per target process 536145256Sjkoshy * - owner process descriptors (and attached lists), one per owner process 537145256Sjkoshy * - lookup hash tables for owner and target processes 538145256Sjkoshy * - PMC descriptors (and attached lists) 539145256Sjkoshy * - per-cpu hardware state 540145256Sjkoshy * - the 'hook' variable through which the kernel calls into 541145256Sjkoshy * this module 542145256Sjkoshy * - the machine hardware state (managed by the MD layer) 543145256Sjkoshy * 544145256Sjkoshy * These data structures are accessed from: 545145256Sjkoshy * 546145256Sjkoshy * - thread context-switch code 547145256Sjkoshy * - interrupt handlers (possibly on multiple cpus) 548145256Sjkoshy * - kernel threads on multiple cpus running on behalf of user 549145256Sjkoshy * processes doing system calls 550145256Sjkoshy * - this driver's private kernel threads 551145256Sjkoshy * 552145256Sjkoshy * = Locks and Locking strategy = 553145256Sjkoshy * 554145256Sjkoshy * The driver uses four locking strategies for its operation: 555145256Sjkoshy * 556168856Sjkoshy * - The global SX lock "pmc_sx" is used to protect internal 557168856Sjkoshy * data structures. 558145256Sjkoshy * 559168856Sjkoshy * Calls into the module by syscall() start with this lock being 560168856Sjkoshy * held in exclusive mode. Depending on the requested operation, 561168856Sjkoshy * the lock may be downgraded to 'shared' mode to allow more 562168856Sjkoshy * concurrent readers into the module. Calls into the module from 563168856Sjkoshy * other parts of the kernel acquire the lock in shared mode. 564145256Sjkoshy * 565145256Sjkoshy * This SX lock is held in exclusive mode for any operations that 566145256Sjkoshy * modify the linkages between the driver's internal data structures. 567145256Sjkoshy * 568145256Sjkoshy * The 'pmc_hook' function pointer is also protected by this lock. 569145256Sjkoshy * It is only examined with the sx lock held in exclusive mode. The 570168856Sjkoshy * kernel module is allowed to be unloaded only with the sx lock held 571168856Sjkoshy * in exclusive mode. In normal syscall handling, after acquiring the 572168856Sjkoshy * pmc_sx lock we first check that 'pmc_hook' is non-null before 573168856Sjkoshy * proceeding. This prevents races between the thread unloading the module 574168856Sjkoshy * and other threads seeking to use the module. 575145256Sjkoshy * 576145256Sjkoshy * - Lookups of target process structures and owner process structures 577145256Sjkoshy * cannot use the global "pmc_sx" SX lock because these lookups need 578145256Sjkoshy * to happen during context switches and in other critical sections 579145256Sjkoshy * where sleeping is not allowed. We protect these lookup tables 580145256Sjkoshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 581168856Sjkoshy * "pmc_ownerhash_mtx". 582145256Sjkoshy * 583145256Sjkoshy * - Interrupt handlers work in a lock free manner. At interrupt 584145256Sjkoshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 585145256Sjkoshy * when the PMC was started. If this pointer is NULL, the interrupt 586145256Sjkoshy * is ignored after updating driver statistics. We ensure that this 587145256Sjkoshy * pointer is set (using an atomic operation if necessary) before the 588145256Sjkoshy * PMC hardware is started. Conversely, this pointer is unset atomically 589145256Sjkoshy * only after the PMC hardware is stopped. 590145256Sjkoshy * 591145256Sjkoshy * We ensure that everything needed for the operation of an 592145256Sjkoshy * interrupt handler is available without it needing to acquire any 593145256Sjkoshy * locks. We also ensure that a PMC's software state is destroyed only 594145256Sjkoshy * after the PMC is taken off hardware (on all CPUs). 595145256Sjkoshy * 596145256Sjkoshy * - Context-switch handling with process-private PMCs needs more 597145256Sjkoshy * care. 598145256Sjkoshy * 599145256Sjkoshy * A given process may be the target of multiple PMCs. For example, 600145256Sjkoshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 601145256Sjkoshy * while the target process is running on another. A PMC could also 602145256Sjkoshy * be getting released because its owner is exiting. We tackle 603145256Sjkoshy * these situations in the following manner: 604145256Sjkoshy * 605145256Sjkoshy * - each target process structure 'pmc_process' has an array 606145256Sjkoshy * of 'struct pmc *' pointers, one for each hardware PMC. 607145256Sjkoshy * 608145256Sjkoshy * - At context switch IN time, each "target" PMC in RUNNING state 609145256Sjkoshy * gets started on hardware and a pointer to each PMC is copied into 610145256Sjkoshy * the per-cpu phw array. The 'runcount' for the PMC is 611145256Sjkoshy * incremented. 612145256Sjkoshy * 613145256Sjkoshy * - At context switch OUT time, all process-virtual PMCs are stopped 614145256Sjkoshy * on hardware. The saved value is added to the PMCs value field 615145256Sjkoshy * only if the PMC is in a non-deleted state (the PMCs state could 616145256Sjkoshy * have changed during the current time slice). 617145256Sjkoshy * 618145256Sjkoshy * Note that since in-between a switch IN on a processor and a switch 619145256Sjkoshy * OUT, the PMC could have been released on another CPU. Therefore 620145256Sjkoshy * context switch OUT always looks at the hardware state to turn 621145256Sjkoshy * OFF PMCs and will update a PMC's saved value only if reachable 622145256Sjkoshy * from the target process record. 623145256Sjkoshy * 624145256Sjkoshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 625145256Sjkoshy * be attached to many processes at the time of the call and could 626145256Sjkoshy * be active on multiple CPUs). 627145256Sjkoshy * 628145256Sjkoshy * We prevent further scheduling of the PMC by marking it as in 629145256Sjkoshy * state 'DELETED'. If the runcount of the PMC is non-zero then 630145256Sjkoshy * this PMC is currently running on a CPU somewhere. The thread 631167086Sjhb * doing the PMCRELEASE operation waits by repeatedly doing a 632167086Sjhb * pause() till the runcount comes to zero. 633145256Sjkoshy * 634168856Sjkoshy * The contents of a PMC descriptor (struct pmc) are protected using 635168856Sjkoshy * a spin-mutex. In order to save space, we use a mutex pool. 636168856Sjkoshy * 637168856Sjkoshy * In terms of lock types used by witness(4), we use: 638168856Sjkoshy * - Type "pmc-sx", used by the global SX lock. 639168856Sjkoshy * - Type "pmc-sleep", for sleep mutexes used by logger threads. 640168856Sjkoshy * - Type "pmc-per-proc", for protecting PMC owner descriptors. 641168856Sjkoshy * - Type "pmc-leaf", used for all other spin mutexes. 642145256Sjkoshy */ 643145256Sjkoshy 644145256Sjkoshy/* 645145256Sjkoshy * save the cpu binding of the current kthread 646145256Sjkoshy */ 647145256Sjkoshy 648145256Sjkoshystatic void 649145256Sjkoshypmc_save_cpu_binding(struct pmc_binding *pb) 650145256Sjkoshy{ 651145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "save-cpu"); 652170307Sjeff thread_lock(curthread); 653145256Sjkoshy pb->pb_bound = sched_is_bound(curthread); 654145256Sjkoshy pb->pb_cpu = curthread->td_oncpu; 655170307Sjeff thread_unlock(curthread); 656145256Sjkoshy PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 657145256Sjkoshy} 658145256Sjkoshy 659145256Sjkoshy/* 660145256Sjkoshy * restore the cpu binding of the current thread 661145256Sjkoshy */ 662145256Sjkoshy 663145256Sjkoshystatic void 664145256Sjkoshypmc_restore_cpu_binding(struct pmc_binding *pb) 665145256Sjkoshy{ 666145256Sjkoshy PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 667145256Sjkoshy curthread->td_oncpu, pb->pb_cpu); 668170307Sjeff thread_lock(curthread); 669145256Sjkoshy if (pb->pb_bound) 670145256Sjkoshy sched_bind(curthread, pb->pb_cpu); 671145256Sjkoshy else 672145256Sjkoshy sched_unbind(curthread); 673170307Sjeff thread_unlock(curthread); 674145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "restore-cpu done"); 675145256Sjkoshy} 676145256Sjkoshy 677145256Sjkoshy/* 678145256Sjkoshy * move execution over the specified cpu and bind it there. 679145256Sjkoshy */ 680145256Sjkoshy 681145256Sjkoshystatic void 682145256Sjkoshypmc_select_cpu(int cpu) 683145256Sjkoshy{ 684183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 685145256Sjkoshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 686145256Sjkoshy 687183266Sjkoshy /* Never move to an inactive CPU. */ 688183266Sjkoshy KASSERT(pmc_cpu_is_active(cpu), ("[pmc,%d] selecting inactive " 689183266Sjkoshy "CPU %d", __LINE__, cpu)); 690145256Sjkoshy 691145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu); 692170307Sjeff thread_lock(curthread); 693145256Sjkoshy sched_bind(curthread, cpu); 694170307Sjeff thread_unlock(curthread); 695145256Sjkoshy 696145256Sjkoshy KASSERT(curthread->td_oncpu == cpu, 697145256Sjkoshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 698145256Sjkoshy cpu, curthread->td_oncpu)); 699145256Sjkoshy 700145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 701145256Sjkoshy} 702145256Sjkoshy 703145256Sjkoshy/* 704145774Sjkoshy * Force a context switch. 705145774Sjkoshy * 706167086Sjhb * We do this by pause'ing for 1 tick -- invoking mi_switch() is not 707145774Sjkoshy * guaranteed to force a context switch. 708145774Sjkoshy */ 709145774Sjkoshy 710145774Sjkoshystatic void 711145774Sjkoshypmc_force_context_switch(void) 712145774Sjkoshy{ 713145774Sjkoshy 714167086Sjhb pause("pmcctx", 1); 715145774Sjkoshy} 716145774Sjkoshy 717145774Sjkoshy/* 718147191Sjkoshy * Get the file name for an executable. This is a simple wrapper 719147191Sjkoshy * around vn_fullpath(9). 720145256Sjkoshy */ 721145256Sjkoshy 722147191Sjkoshystatic void 723147708Sjkoshypmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 724145256Sjkoshy{ 725145256Sjkoshy 726147191Sjkoshy *fullpath = "unknown"; 727147191Sjkoshy *freepath = NULL; 728175294Sattilio vn_fullpath(curthread, v, fullpath, freepath); 729145256Sjkoshy} 730145256Sjkoshy 731145256Sjkoshy/* 732145256Sjkoshy * remove an process owning PMCs 733145256Sjkoshy */ 734145256Sjkoshy 735145256Sjkoshyvoid 736145256Sjkoshypmc_remove_owner(struct pmc_owner *po) 737145256Sjkoshy{ 738147191Sjkoshy struct pmc *pm, *tmp; 739145256Sjkoshy 740145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 741145256Sjkoshy 742145256Sjkoshy PMCDBG(OWN,ORM,1, "remove-owner po=%p", po); 743145256Sjkoshy 744145256Sjkoshy /* Remove descriptor from the owner hash table */ 745145256Sjkoshy LIST_REMOVE(po, po_next); 746145256Sjkoshy 747147191Sjkoshy /* release all owned PMC descriptors */ 748147191Sjkoshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 749147191Sjkoshy PMCDBG(OWN,ORM,2, "pmc=%p", pm); 750147191Sjkoshy KASSERT(pm->pm_owner == po, 751147191Sjkoshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 752145256Sjkoshy 753147191Sjkoshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 754145256Sjkoshy } 755145256Sjkoshy 756147191Sjkoshy KASSERT(po->po_sscount == 0, 757147191Sjkoshy ("[pmc,%d] SS count not zero", __LINE__)); 758145256Sjkoshy KASSERT(LIST_EMPTY(&po->po_pmcs), 759147191Sjkoshy ("[pmc,%d] PMC list not empty", __LINE__)); 760145256Sjkoshy 761147191Sjkoshy /* de-configure the log file if present */ 762145774Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 763147191Sjkoshy pmclog_deconfigure_log(po); 764145256Sjkoshy} 765145256Sjkoshy 766145256Sjkoshy/* 767145256Sjkoshy * remove an owner process record if all conditions are met. 768145256Sjkoshy */ 769145256Sjkoshy 770145256Sjkoshystatic void 771145256Sjkoshypmc_maybe_remove_owner(struct pmc_owner *po) 772145256Sjkoshy{ 773145256Sjkoshy 774145256Sjkoshy PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po); 775145256Sjkoshy 776145256Sjkoshy /* 777145256Sjkoshy * Remove owner record if 778145256Sjkoshy * - this process does not own any PMCs 779145256Sjkoshy * - this process has not allocated a system-wide sampling buffer 780145256Sjkoshy */ 781145256Sjkoshy 782145256Sjkoshy if (LIST_EMPTY(&po->po_pmcs) && 783145774Sjkoshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 784145256Sjkoshy pmc_remove_owner(po); 785147191Sjkoshy pmc_destroy_owner_descriptor(po); 786145256Sjkoshy } 787145256Sjkoshy} 788145256Sjkoshy 789145256Sjkoshy/* 790145256Sjkoshy * Add an association between a target process and a PMC. 791145256Sjkoshy */ 792145256Sjkoshy 793145256Sjkoshystatic void 794145256Sjkoshypmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 795145256Sjkoshy{ 796145256Sjkoshy int ri; 797145256Sjkoshy struct pmc_target *pt; 798145256Sjkoshy 799145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 800145256Sjkoshy 801145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 802145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 803147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 804147191Sjkoshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 805147191Sjkoshy __LINE__, pm, pp->pp_proc->p_pid)); 806198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= ((int) md->pmd_npmc - 1), 807145256Sjkoshy ("[pmc,%d] Illegal reference count %d for process record %p", 808145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 809145256Sjkoshy 810145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 811145256Sjkoshy 812145256Sjkoshy PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 813145256Sjkoshy pm, ri, pp); 814145256Sjkoshy 815153110Sru#ifdef DEBUG 816145256Sjkoshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 817145256Sjkoshy if (pt->pt_process == pp) 818145256Sjkoshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 819145256Sjkoshy __LINE__, pp, pm)); 820145256Sjkoshy#endif 821145256Sjkoshy 822184802Sjkoshy pt = malloc(sizeof(struct pmc_target), M_PMC, M_WAITOK|M_ZERO); 823145256Sjkoshy pt->pt_process = pp; 824145256Sjkoshy 825145256Sjkoshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 826145256Sjkoshy 827148067Sjhb atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 828148067Sjhb (uintptr_t)pm); 829145256Sjkoshy 830145615Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) 831145774Sjkoshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 832145615Sjkoshy 833147191Sjkoshy /* 834147191Sjkoshy * Initialize the per-process values at this row index. 835147191Sjkoshy */ 836147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 837147191Sjkoshy pm->pm_sc.pm_reloadcount : 0; 838147191Sjkoshy 839145256Sjkoshy pp->pp_refcnt++; 840145256Sjkoshy 841145256Sjkoshy} 842145256Sjkoshy 843145256Sjkoshy/* 844145256Sjkoshy * Removes the association between a target process and a PMC. 845145256Sjkoshy */ 846145256Sjkoshy 847145256Sjkoshystatic void 848145256Sjkoshypmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 849145256Sjkoshy{ 850145256Sjkoshy int ri; 851147191Sjkoshy struct proc *p; 852145256Sjkoshy struct pmc_target *ptgt; 853145256Sjkoshy 854145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 855145256Sjkoshy 856145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 857145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 858145256Sjkoshy 859198343Sfabient KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt <= (int) md->pmd_npmc, 860145256Sjkoshy ("[pmc,%d] Illegal ref count %d on process record %p", 861145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 862145256Sjkoshy 863145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 864145256Sjkoshy 865145256Sjkoshy PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 866145256Sjkoshy pm, ri, pp); 867145256Sjkoshy 868145256Sjkoshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 869145256Sjkoshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 870145256Sjkoshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 871145256Sjkoshy 872145256Sjkoshy pp->pp_pmcs[ri].pp_pmc = NULL; 873145256Sjkoshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 874145256Sjkoshy 875145774Sjkoshy /* Remove owner-specific flags */ 876145774Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) { 877145774Sjkoshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 878145774Sjkoshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 879145774Sjkoshy } 880145615Sjkoshy 881145256Sjkoshy pp->pp_refcnt--; 882145256Sjkoshy 883145256Sjkoshy /* Remove the target process from the PMC structure */ 884145256Sjkoshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 885145256Sjkoshy if (ptgt->pt_process == pp) 886145256Sjkoshy break; 887145256Sjkoshy 888145256Sjkoshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 889145256Sjkoshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 890145256Sjkoshy 891145256Sjkoshy LIST_REMOVE(ptgt, pt_next); 892184205Sdes free(ptgt, M_PMC); 893145256Sjkoshy 894147191Sjkoshy /* if the PMC now lacks targets, send the owner a SIGIO */ 895147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) { 896147191Sjkoshy p = pm->pm_owner->po_owner; 897147191Sjkoshy PROC_LOCK(p); 898225617Skmacy kern_psignal(p, SIGIO); 899147191Sjkoshy PROC_UNLOCK(p); 900145256Sjkoshy 901147191Sjkoshy PMCDBG(PRC,SIG,2, "signalling proc=%p signal=%d", p, 902147191Sjkoshy SIGIO); 903145256Sjkoshy } 904145256Sjkoshy} 905145256Sjkoshy 906145256Sjkoshy/* 907145256Sjkoshy * Check if PMC 'pm' may be attached to target process 't'. 908145256Sjkoshy */ 909145256Sjkoshy 910145256Sjkoshystatic int 911145256Sjkoshypmc_can_attach(struct pmc *pm, struct proc *t) 912145256Sjkoshy{ 913145256Sjkoshy struct proc *o; /* pmc owner */ 914145256Sjkoshy struct ucred *oc, *tc; /* owner, target credentials */ 915145256Sjkoshy int decline_attach, i; 916145256Sjkoshy 917145256Sjkoshy /* 918145256Sjkoshy * A PMC's owner can always attach that PMC to itself. 919145256Sjkoshy */ 920145256Sjkoshy 921145256Sjkoshy if ((o = pm->pm_owner->po_owner) == t) 922145256Sjkoshy return 0; 923145256Sjkoshy 924145256Sjkoshy PROC_LOCK(o); 925145256Sjkoshy oc = o->p_ucred; 926145256Sjkoshy crhold(oc); 927145256Sjkoshy PROC_UNLOCK(o); 928145256Sjkoshy 929145256Sjkoshy PROC_LOCK(t); 930145256Sjkoshy tc = t->p_ucred; 931145256Sjkoshy crhold(tc); 932145256Sjkoshy PROC_UNLOCK(t); 933145256Sjkoshy 934145256Sjkoshy /* 935145256Sjkoshy * The effective uid of the PMC owner should match at least one 936145256Sjkoshy * of the {effective,real,saved} uids of the target process. 937145256Sjkoshy */ 938145256Sjkoshy 939145256Sjkoshy decline_attach = oc->cr_uid != tc->cr_uid && 940145256Sjkoshy oc->cr_uid != tc->cr_svuid && 941145256Sjkoshy oc->cr_uid != tc->cr_ruid; 942145256Sjkoshy 943145256Sjkoshy /* 944145256Sjkoshy * Every one of the target's group ids, must be in the owner's 945145256Sjkoshy * group list. 946145256Sjkoshy */ 947145256Sjkoshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 948145256Sjkoshy decline_attach = !groupmember(tc->cr_groups[i], oc); 949145256Sjkoshy 950145256Sjkoshy /* check the read and saved gids too */ 951145256Sjkoshy if (decline_attach == 0) 952145256Sjkoshy decline_attach = !groupmember(tc->cr_rgid, oc) || 953145256Sjkoshy !groupmember(tc->cr_svgid, oc); 954145256Sjkoshy 955145256Sjkoshy crfree(tc); 956145256Sjkoshy crfree(oc); 957145256Sjkoshy 958145256Sjkoshy return !decline_attach; 959145256Sjkoshy} 960145256Sjkoshy 961145256Sjkoshy/* 962145256Sjkoshy * Attach a process to a PMC. 963145256Sjkoshy */ 964145256Sjkoshy 965145256Sjkoshystatic int 966145256Sjkoshypmc_attach_one_process(struct proc *p, struct pmc *pm) 967145256Sjkoshy{ 968145256Sjkoshy int ri; 969147191Sjkoshy char *fullpath, *freepath; 970145256Sjkoshy struct pmc_process *pp; 971145256Sjkoshy 972145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 973145256Sjkoshy 974145256Sjkoshy PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 975145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 976145256Sjkoshy 977145256Sjkoshy /* 978145256Sjkoshy * Locate the process descriptor corresponding to process 'p', 979145256Sjkoshy * allocating space as needed. 980145256Sjkoshy * 981145256Sjkoshy * Verify that rowindex 'pm_rowindex' is free in the process 982145256Sjkoshy * descriptor. 983145256Sjkoshy * 984145256Sjkoshy * If not, allocate space for a descriptor and link the 985145256Sjkoshy * process descriptor and PMC. 986145256Sjkoshy */ 987145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 988145256Sjkoshy 989145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 990145256Sjkoshy return ENOMEM; 991145256Sjkoshy 992145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 993145256Sjkoshy return EEXIST; 994145256Sjkoshy 995145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 996145256Sjkoshy return EBUSY; 997145256Sjkoshy 998145256Sjkoshy pmc_link_target_process(pm, pp); 999145256Sjkoshy 1000147191Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 1001147191Sjkoshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 1002147191Sjkoshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 1003147191Sjkoshy 1004147191Sjkoshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 1005147191Sjkoshy 1006147191Sjkoshy /* issue an attach event to a configured log file */ 1007147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 1008147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1009180794Sjeff if (p->p_flag & P_KTHREAD) { 1010180794Sjeff fullpath = kernelname; 1011180794Sjeff freepath = NULL; 1012180794Sjeff } else 1013180794Sjeff pmclog_process_pmcattach(pm, p->p_pid, fullpath); 1014147191Sjkoshy if (freepath) 1015184205Sdes free(freepath, M_TEMP); 1016174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1017174395Sjkoshy pmc_log_process_mappings(pm->pm_owner, p); 1018147191Sjkoshy } 1019145256Sjkoshy /* mark process as using HWPMCs */ 1020145256Sjkoshy PROC_LOCK(p); 1021145256Sjkoshy p->p_flag |= P_HWPMC; 1022145256Sjkoshy PROC_UNLOCK(p); 1023145256Sjkoshy 1024145256Sjkoshy return 0; 1025145256Sjkoshy} 1026145256Sjkoshy 1027145256Sjkoshy/* 1028145256Sjkoshy * Attach a process and optionally its children 1029145256Sjkoshy */ 1030145256Sjkoshy 1031145256Sjkoshystatic int 1032145256Sjkoshypmc_attach_process(struct proc *p, struct pmc *pm) 1033145256Sjkoshy{ 1034145256Sjkoshy int error; 1035145256Sjkoshy struct proc *top; 1036145256Sjkoshy 1037145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1038145256Sjkoshy 1039145256Sjkoshy PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 1040145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1041145256Sjkoshy 1042145774Sjkoshy 1043145774Sjkoshy /* 1044145774Sjkoshy * If this PMC successfully allowed a GETMSR operation 1045145774Sjkoshy * in the past, disallow further ATTACHes. 1046145774Sjkoshy */ 1047145774Sjkoshy 1048145774Sjkoshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 1049145774Sjkoshy return EPERM; 1050145774Sjkoshy 1051145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1052145256Sjkoshy return pmc_attach_one_process(p, pm); 1053145256Sjkoshy 1054145256Sjkoshy /* 1055145256Sjkoshy * Traverse all child processes, attaching them to 1056145256Sjkoshy * this PMC. 1057145256Sjkoshy */ 1058145256Sjkoshy 1059145256Sjkoshy sx_slock(&proctree_lock); 1060145256Sjkoshy 1061145256Sjkoshy top = p; 1062145256Sjkoshy 1063145256Sjkoshy for (;;) { 1064145256Sjkoshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1065145256Sjkoshy break; 1066145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1067145256Sjkoshy p = LIST_FIRST(&p->p_children); 1068145256Sjkoshy else for (;;) { 1069145256Sjkoshy if (p == top) 1070145256Sjkoshy goto done; 1071145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1072145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1073145256Sjkoshy break; 1074145256Sjkoshy } 1075145256Sjkoshy p = p->p_pptr; 1076145256Sjkoshy } 1077145256Sjkoshy } 1078145256Sjkoshy 1079145256Sjkoshy if (error) 1080145256Sjkoshy (void) pmc_detach_process(top, pm); 1081145256Sjkoshy 1082145256Sjkoshy done: 1083145256Sjkoshy sx_sunlock(&proctree_lock); 1084145256Sjkoshy return error; 1085145256Sjkoshy} 1086145256Sjkoshy 1087145256Sjkoshy/* 1088145256Sjkoshy * Detach a process from a PMC. If there are no other PMCs tracking 1089145256Sjkoshy * this process, remove the process structure from its hash table. If 1090145256Sjkoshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1091145256Sjkoshy */ 1092145256Sjkoshy 1093145256Sjkoshystatic int 1094145256Sjkoshypmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1095145256Sjkoshy{ 1096145256Sjkoshy int ri; 1097145256Sjkoshy struct pmc_process *pp; 1098145256Sjkoshy 1099145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1100145256Sjkoshy 1101145256Sjkoshy KASSERT(pm != NULL, 1102145256Sjkoshy ("[pmc,%d] null pm pointer", __LINE__)); 1103145256Sjkoshy 1104145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1105145774Sjkoshy 1106145256Sjkoshy PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1107145774Sjkoshy pm, ri, p, p->p_pid, p->p_comm, flags); 1108145256Sjkoshy 1109145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1110145256Sjkoshy return ESRCH; 1111145256Sjkoshy 1112145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1113145256Sjkoshy return EINVAL; 1114145256Sjkoshy 1115145256Sjkoshy pmc_unlink_target_process(pm, pp); 1116145256Sjkoshy 1117147191Sjkoshy /* Issue a detach entry if a log file is configured */ 1118147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1119147191Sjkoshy pmclog_process_pmcdetach(pm, p->p_pid); 1120147191Sjkoshy 1121145256Sjkoshy /* 1122145256Sjkoshy * If there are no PMCs targetting this process, we remove its 1123145256Sjkoshy * descriptor from the target hash table and unset the P_HWPMC 1124145256Sjkoshy * flag in the struct proc. 1125145256Sjkoshy */ 1126198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1127145256Sjkoshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1128145256Sjkoshy __LINE__, pp->pp_refcnt, pp)); 1129145256Sjkoshy 1130145256Sjkoshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1131145256Sjkoshy return 0; 1132145256Sjkoshy 1133145256Sjkoshy pmc_remove_process_descriptor(pp); 1134145256Sjkoshy 1135145256Sjkoshy if (flags & PMC_FLAG_REMOVE) 1136184205Sdes free(pp, M_PMC); 1137145256Sjkoshy 1138145256Sjkoshy PROC_LOCK(p); 1139145256Sjkoshy p->p_flag &= ~P_HWPMC; 1140145256Sjkoshy PROC_UNLOCK(p); 1141145256Sjkoshy 1142145256Sjkoshy return 0; 1143145256Sjkoshy} 1144145256Sjkoshy 1145145256Sjkoshy/* 1146145256Sjkoshy * Detach a process and optionally its descendants from a PMC. 1147145256Sjkoshy */ 1148145256Sjkoshy 1149145256Sjkoshystatic int 1150145256Sjkoshypmc_detach_process(struct proc *p, struct pmc *pm) 1151145256Sjkoshy{ 1152145256Sjkoshy struct proc *top; 1153145256Sjkoshy 1154145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1155145256Sjkoshy 1156145256Sjkoshy PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1157145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1158145256Sjkoshy 1159145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1160145256Sjkoshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1161145256Sjkoshy 1162145256Sjkoshy /* 1163145256Sjkoshy * Traverse all children, detaching them from this PMC. We 1164145256Sjkoshy * ignore errors since we could be detaching a PMC from a 1165145256Sjkoshy * partially attached proc tree. 1166145256Sjkoshy */ 1167145256Sjkoshy 1168145256Sjkoshy sx_slock(&proctree_lock); 1169145256Sjkoshy 1170145256Sjkoshy top = p; 1171145256Sjkoshy 1172145256Sjkoshy for (;;) { 1173145256Sjkoshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1174145256Sjkoshy 1175145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1176145256Sjkoshy p = LIST_FIRST(&p->p_children); 1177145256Sjkoshy else for (;;) { 1178145256Sjkoshy if (p == top) 1179145256Sjkoshy goto done; 1180145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1181145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1182145256Sjkoshy break; 1183145256Sjkoshy } 1184145256Sjkoshy p = p->p_pptr; 1185145256Sjkoshy } 1186145256Sjkoshy } 1187145256Sjkoshy 1188145256Sjkoshy done: 1189145256Sjkoshy sx_sunlock(&proctree_lock); 1190147191Sjkoshy 1191147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 1192147191Sjkoshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1193147191Sjkoshy 1194145256Sjkoshy return 0; 1195145256Sjkoshy} 1196145256Sjkoshy 1197147191Sjkoshy 1198145256Sjkoshy/* 1199147191Sjkoshy * Thread context switch IN 1200145256Sjkoshy */ 1201145256Sjkoshy 1202147191Sjkoshystatic void 1203147191Sjkoshypmc_process_csw_in(struct thread *td) 1204147191Sjkoshy{ 1205147191Sjkoshy int cpu; 1206184802Sjkoshy unsigned int adjri, ri; 1207147191Sjkoshy struct pmc *pm; 1208147191Sjkoshy struct proc *p; 1209147191Sjkoshy struct pmc_cpu *pc; 1210147191Sjkoshy struct pmc_hw *phw; 1211184802Sjkoshy pmc_value_t newvalue; 1212147191Sjkoshy struct pmc_process *pp; 1213184802Sjkoshy struct pmc_classdep *pcd; 1214145256Sjkoshy 1215147191Sjkoshy p = td->td_proc; 1216145256Sjkoshy 1217147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1218147191Sjkoshy return; 1219145256Sjkoshy 1220147191Sjkoshy KASSERT(pp->pp_proc == td->td_proc, 1221147191Sjkoshy ("[pmc,%d] not my thread state", __LINE__)); 1222145256Sjkoshy 1223147191Sjkoshy critical_enter(); /* no preemption from this point */ 1224145256Sjkoshy 1225147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1226145256Sjkoshy 1227147191Sjkoshy PMCDBG(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1228147191Sjkoshy p->p_pid, p->p_comm, pp); 1229145256Sjkoshy 1230183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1231147191Sjkoshy ("[pmc,%d] wierd CPU id %d", __LINE__, cpu)); 1232145256Sjkoshy 1233147191Sjkoshy pc = pmc_pcpu[cpu]; 1234145256Sjkoshy 1235147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1236145256Sjkoshy 1237147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1238147191Sjkoshy continue; 1239147191Sjkoshy 1240147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1241147191Sjkoshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1242147191Sjkoshy __LINE__, PMC_TO_MODE(pm))); 1243147191Sjkoshy 1244147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1245147191Sjkoshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1246147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1247147191Sjkoshy 1248145256Sjkoshy /* 1249147191Sjkoshy * Only PMCs that are marked as 'RUNNING' need 1250147191Sjkoshy * be placed on hardware. 1251145256Sjkoshy */ 1252145256Sjkoshy 1253147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 1254147191Sjkoshy continue; 1255145256Sjkoshy 1256147191Sjkoshy /* increment PMC runcount */ 1257208861Sfabient atomic_add_rel_int(&pm->pm_runcount, 1); 1258145256Sjkoshy 1259147191Sjkoshy /* configure the HWPMC we are going to use. */ 1260184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1261184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, pm); 1262145256Sjkoshy 1263147191Sjkoshy phw = pc->pc_hwpmcs[ri]; 1264145256Sjkoshy 1265147191Sjkoshy KASSERT(phw != NULL, 1266147191Sjkoshy ("[pmc,%d] null hw pointer", __LINE__)); 1267145256Sjkoshy 1268147191Sjkoshy KASSERT(phw->phw_pmc == pm, 1269147191Sjkoshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1270147191Sjkoshy phw->phw_pmc, pm)); 1271145256Sjkoshy 1272147191Sjkoshy /* 1273147191Sjkoshy * Write out saved value and start the PMC. 1274147191Sjkoshy * 1275147191Sjkoshy * Sampling PMCs use a per-process value, while 1276147191Sjkoshy * counting mode PMCs use a per-pmc value that is 1277147191Sjkoshy * inherited across descendants. 1278147191Sjkoshy */ 1279147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1280147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1281147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1282147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval; 1283147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1284147191Sjkoshy } else { 1285147191Sjkoshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1286147191Sjkoshy ("[pmc,%d] illegal mode=%d", __LINE__, 1287147191Sjkoshy PMC_TO_MODE(pm))); 1288147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1289147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1290147191Sjkoshy pm->pm_gv.pm_savedvalue; 1291147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1292147191Sjkoshy } 1293145256Sjkoshy 1294147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1295145256Sjkoshy 1296184802Sjkoshy pcd->pcd_write_pmc(cpu, adjri, newvalue); 1297184802Sjkoshy pcd->pcd_start_pmc(cpu, adjri); 1298147191Sjkoshy } 1299145256Sjkoshy 1300147191Sjkoshy /* 1301147191Sjkoshy * perform any other architecture/cpu dependent thread 1302147191Sjkoshy * switch-in actions. 1303147191Sjkoshy */ 1304145256Sjkoshy 1305147191Sjkoshy (void) (*md->pmd_switch_in)(pc, pp); 1306145256Sjkoshy 1307147191Sjkoshy critical_exit(); 1308145256Sjkoshy 1309147191Sjkoshy} 1310145256Sjkoshy 1311147191Sjkoshy/* 1312147191Sjkoshy * Thread context switch OUT. 1313147191Sjkoshy */ 1314145256Sjkoshy 1315147191Sjkoshystatic void 1316147191Sjkoshypmc_process_csw_out(struct thread *td) 1317147191Sjkoshy{ 1318147191Sjkoshy int cpu; 1319184802Sjkoshy int64_t tmp; 1320147191Sjkoshy struct pmc *pm; 1321147191Sjkoshy struct proc *p; 1322184802Sjkoshy enum pmc_mode mode; 1323147191Sjkoshy struct pmc_cpu *pc; 1324184802Sjkoshy pmc_value_t newvalue; 1325184802Sjkoshy unsigned int adjri, ri; 1326147191Sjkoshy struct pmc_process *pp; 1327184802Sjkoshy struct pmc_classdep *pcd; 1328145256Sjkoshy 1329184802Sjkoshy 1330147191Sjkoshy /* 1331147191Sjkoshy * Locate our process descriptor; this may be NULL if 1332147191Sjkoshy * this process is exiting and we have already removed 1333147191Sjkoshy * the process from the target process table. 1334147191Sjkoshy * 1335147191Sjkoshy * Note that due to kernel preemption, multiple 1336147191Sjkoshy * context switches may happen while the process is 1337147191Sjkoshy * exiting. 1338147191Sjkoshy * 1339147191Sjkoshy * Note also that if the target process cannot be 1340147191Sjkoshy * found we still need to deconfigure any PMCs that 1341147191Sjkoshy * are currently running on hardware. 1342147191Sjkoshy */ 1343145256Sjkoshy 1344147191Sjkoshy p = td->td_proc; 1345147191Sjkoshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1346145256Sjkoshy 1347147191Sjkoshy /* 1348147191Sjkoshy * save PMCs 1349147191Sjkoshy */ 1350145256Sjkoshy 1351147191Sjkoshy critical_enter(); 1352145774Sjkoshy 1353147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1354145256Sjkoshy 1355147191Sjkoshy PMCDBG(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1356147191Sjkoshy p->p_pid, p->p_comm, pp); 1357145615Sjkoshy 1358183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1359147191Sjkoshy ("[pmc,%d wierd CPU id %d", __LINE__, cpu)); 1360145615Sjkoshy 1361147191Sjkoshy pc = pmc_pcpu[cpu]; 1362145615Sjkoshy 1363147191Sjkoshy /* 1364147191Sjkoshy * When a PMC gets unlinked from a target PMC, it will 1365147191Sjkoshy * be removed from the target's pp_pmc[] array. 1366147191Sjkoshy * 1367147191Sjkoshy * However, on a MP system, the target could have been 1368147191Sjkoshy * executing on another CPU at the time of the unlink. 1369147191Sjkoshy * So, at context switch OUT time, we need to look at 1370147191Sjkoshy * the hardware to determine if a PMC is scheduled on 1371147191Sjkoshy * it. 1372147191Sjkoshy */ 1373145256Sjkoshy 1374147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1375145256Sjkoshy 1376184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1377184802Sjkoshy pm = NULL; 1378184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 1379145256Sjkoshy 1380147191Sjkoshy if (pm == NULL) /* nothing at this row index */ 1381147191Sjkoshy continue; 1382145256Sjkoshy 1383147191Sjkoshy mode = PMC_TO_MODE(pm); 1384147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1385147191Sjkoshy continue; /* not a process virtual PMC */ 1386145774Sjkoshy 1387147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1388147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1389147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1390145256Sjkoshy 1391147191Sjkoshy /* Stop hardware if not already stopped */ 1392147867Sjkoshy if (pm->pm_stalled == 0) 1393184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 1394147191Sjkoshy 1395147191Sjkoshy /* reduce this PMC's runcount */ 1396208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount, 1); 1397147191Sjkoshy 1398145256Sjkoshy /* 1399147191Sjkoshy * If this PMC is associated with this process, 1400147191Sjkoshy * save the reading. 1401145256Sjkoshy */ 1402145256Sjkoshy 1403147191Sjkoshy if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) { 1404147191Sjkoshy 1405147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1406147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1407147191Sjkoshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1408147191Sjkoshy 1409147191Sjkoshy KASSERT(pp->pp_refcnt > 0, 1410147191Sjkoshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1411147191Sjkoshy pp->pp_refcnt)); 1412147191Sjkoshy 1413184802Sjkoshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 1414147191Sjkoshy 1415147191Sjkoshy tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1416147191Sjkoshy 1417199972Semaste PMCDBG(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd", cpu, ri, 1418147191Sjkoshy tmp); 1419147191Sjkoshy 1420147191Sjkoshy if (mode == PMC_MODE_TS) { 1421147191Sjkoshy 1422147191Sjkoshy /* 1423147191Sjkoshy * For sampling process-virtual PMCs, 1424147191Sjkoshy * we expect the count to be 1425147191Sjkoshy * decreasing as the 'value' 1426147191Sjkoshy * programmed into the PMC is the 1427147191Sjkoshy * number of events to be seen till 1428147191Sjkoshy * the next sampling interrupt. 1429147191Sjkoshy */ 1430147191Sjkoshy if (tmp < 0) 1431147191Sjkoshy tmp += pm->pm_sc.pm_reloadcount; 1432147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1433147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval -= tmp; 1434147191Sjkoshy if ((int64_t) pp->pp_pmcs[ri].pp_pmcval < 0) 1435147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += 1436147191Sjkoshy pm->pm_sc.pm_reloadcount; 1437147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1438147191Sjkoshy 1439147191Sjkoshy } else { 1440147191Sjkoshy 1441147191Sjkoshy /* 1442147191Sjkoshy * For counting process-virtual PMCs, 1443147191Sjkoshy * we expect the count to be 1444147191Sjkoshy * increasing monotonically, modulo a 64 1445147191Sjkoshy * bit wraparound. 1446147191Sjkoshy */ 1447147191Sjkoshy KASSERT((int64_t) tmp >= 0, 1448147191Sjkoshy ("[pmc,%d] negative increment cpu=%d " 1449147191Sjkoshy "ri=%d newvalue=%jx saved=%jx " 1450147191Sjkoshy "incr=%jx", __LINE__, cpu, ri, 1451147191Sjkoshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1452147191Sjkoshy 1453147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1454147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 1455147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1456147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1457147191Sjkoshy 1458147191Sjkoshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1459147191Sjkoshy pmclog_process_proccsw(pm, pp, tmp); 1460147191Sjkoshy } 1461145256Sjkoshy } 1462145256Sjkoshy 1463147191Sjkoshy /* mark hardware as free */ 1464184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 1465145256Sjkoshy } 1466145256Sjkoshy 1467145256Sjkoshy /* 1468147191Sjkoshy * perform any other architecture/cpu dependent thread 1469147191Sjkoshy * switch out functions. 1470147191Sjkoshy */ 1471147191Sjkoshy 1472147191Sjkoshy (void) (*md->pmd_switch_out)(pc, pp); 1473147191Sjkoshy 1474147191Sjkoshy critical_exit(); 1475147191Sjkoshy} 1476147191Sjkoshy 1477147191Sjkoshy/* 1478157144Sjkoshy * Log a KLD operation. 1479157144Sjkoshy */ 1480157144Sjkoshy 1481157144Sjkoshystatic void 1482157144Sjkoshypmc_process_kld_load(struct pmckern_map_in *pkm) 1483157144Sjkoshy{ 1484157144Sjkoshy struct pmc_owner *po; 1485157144Sjkoshy 1486157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1487157144Sjkoshy 1488157144Sjkoshy /* 1489157144Sjkoshy * Notify owners of system sampling PMCs about KLD operations. 1490157144Sjkoshy */ 1491157144Sjkoshy 1492157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1493157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1494157144Sjkoshy pmclog_process_map_in(po, (pid_t) -1, pkm->pm_address, 1495157144Sjkoshy (char *) pkm->pm_file); 1496157144Sjkoshy 1497157144Sjkoshy /* 1498157144Sjkoshy * TODO: Notify owners of (all) process-sampling PMCs too. 1499157144Sjkoshy */ 1500157144Sjkoshy 1501157144Sjkoshy return; 1502157144Sjkoshy} 1503157144Sjkoshy 1504157144Sjkoshystatic void 1505157144Sjkoshypmc_process_kld_unload(struct pmckern_map_out *pkm) 1506157144Sjkoshy{ 1507157144Sjkoshy struct pmc_owner *po; 1508157144Sjkoshy 1509157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1510157144Sjkoshy 1511157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1512157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1513157144Sjkoshy pmclog_process_map_out(po, (pid_t) -1, 1514157144Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1515174395Sjkoshy 1516157144Sjkoshy /* 1517157144Sjkoshy * TODO: Notify owners of process-sampling PMCs. 1518157144Sjkoshy */ 1519157144Sjkoshy} 1520157144Sjkoshy 1521157144Sjkoshy/* 1522157144Sjkoshy * A mapping change for a process. 1523157144Sjkoshy */ 1524157144Sjkoshy 1525157144Sjkoshystatic void 1526157144Sjkoshypmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm) 1527157144Sjkoshy{ 1528157144Sjkoshy int ri; 1529157144Sjkoshy pid_t pid; 1530157144Sjkoshy char *fullpath, *freepath; 1531157144Sjkoshy const struct pmc *pm; 1532157144Sjkoshy struct pmc_owner *po; 1533157144Sjkoshy const struct pmc_process *pp; 1534157144Sjkoshy 1535157144Sjkoshy freepath = fullpath = NULL; 1536157144Sjkoshy pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath); 1537157144Sjkoshy 1538157144Sjkoshy pid = td->td_proc->p_pid; 1539157144Sjkoshy 1540157144Sjkoshy /* Inform owners of all system-wide sampling PMCs. */ 1541157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1542157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1543157144Sjkoshy pmclog_process_map_in(po, pid, pkm->pm_address, fullpath); 1544157144Sjkoshy 1545157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1546157144Sjkoshy goto done; 1547157144Sjkoshy 1548157144Sjkoshy /* 1549157144Sjkoshy * Inform sampling PMC owners tracking this process. 1550157144Sjkoshy */ 1551157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1552157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1553157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1554157144Sjkoshy pmclog_process_map_in(pm->pm_owner, 1555157144Sjkoshy pid, pkm->pm_address, fullpath); 1556157144Sjkoshy 1557157144Sjkoshy done: 1558157144Sjkoshy if (freepath) 1559184205Sdes free(freepath, M_TEMP); 1560157144Sjkoshy} 1561157144Sjkoshy 1562157144Sjkoshy 1563157144Sjkoshy/* 1564157144Sjkoshy * Log an munmap request. 1565157144Sjkoshy */ 1566157144Sjkoshy 1567157144Sjkoshystatic void 1568157144Sjkoshypmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm) 1569157144Sjkoshy{ 1570157144Sjkoshy int ri; 1571157144Sjkoshy pid_t pid; 1572157144Sjkoshy struct pmc_owner *po; 1573157144Sjkoshy const struct pmc *pm; 1574157144Sjkoshy const struct pmc_process *pp; 1575157144Sjkoshy 1576157144Sjkoshy pid = td->td_proc->p_pid; 1577157144Sjkoshy 1578157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1579157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1580157144Sjkoshy pmclog_process_map_out(po, pid, pkm->pm_address, 1581157144Sjkoshy pkm->pm_address + pkm->pm_size); 1582157144Sjkoshy 1583157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1584157144Sjkoshy return; 1585157144Sjkoshy 1586157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1587157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1588157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1589157651Sjkoshy pmclog_process_map_out(pm->pm_owner, pid, 1590157651Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1591157144Sjkoshy} 1592157144Sjkoshy 1593157144Sjkoshy/* 1594174395Sjkoshy * Log mapping information about the kernel. 1595174395Sjkoshy */ 1596174395Sjkoshy 1597174395Sjkoshystatic void 1598174395Sjkoshypmc_log_kernel_mappings(struct pmc *pm) 1599174395Sjkoshy{ 1600174395Sjkoshy struct pmc_owner *po; 1601174395Sjkoshy struct pmckern_map_in *km, *kmbase; 1602174395Sjkoshy 1603174395Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1604174395Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 1605174395Sjkoshy ("[pmc,%d] non-sampling PMC (%p) desires mapping information", 1606174395Sjkoshy __LINE__, (void *) pm)); 1607174395Sjkoshy 1608174395Sjkoshy po = pm->pm_owner; 1609174395Sjkoshy 1610174395Sjkoshy if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE) 1611174395Sjkoshy return; 1612174395Sjkoshy 1613174395Sjkoshy /* 1614174395Sjkoshy * Log the current set of kernel modules. 1615174395Sjkoshy */ 1616174395Sjkoshy kmbase = linker_hwpmc_list_objects(); 1617174395Sjkoshy for (km = kmbase; km->pm_file != NULL; km++) { 1618174395Sjkoshy PMCDBG(LOG,REG,1,"%s %p", (char *) km->pm_file, 1619174395Sjkoshy (void *) km->pm_address); 1620174395Sjkoshy pmclog_process_map_in(po, (pid_t) -1, km->pm_address, 1621174395Sjkoshy km->pm_file); 1622174395Sjkoshy } 1623184205Sdes free(kmbase, M_LINKER); 1624174395Sjkoshy 1625174395Sjkoshy po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE; 1626174395Sjkoshy} 1627174395Sjkoshy 1628174395Sjkoshy/* 1629174395Sjkoshy * Log the mappings for a single process. 1630174395Sjkoshy */ 1631174395Sjkoshy 1632174395Sjkoshystatic void 1633174395Sjkoshypmc_log_process_mappings(struct pmc_owner *po, struct proc *p) 1634174395Sjkoshy{ 1635201151Sjkoshy int locked; 1636201021Sjkoshy vm_map_t map; 1637201021Sjkoshy struct vnode *vp; 1638201021Sjkoshy struct vmspace *vm; 1639201021Sjkoshy vm_map_entry_t entry; 1640201021Sjkoshy vm_offset_t last_end; 1641201021Sjkoshy u_int last_timestamp; 1642201021Sjkoshy struct vnode *last_vp; 1643201021Sjkoshy vm_offset_t start_addr; 1644201021Sjkoshy vm_object_t obj, lobj, tobj; 1645201021Sjkoshy char *fullpath, *freepath; 1646201021Sjkoshy 1647201021Sjkoshy last_vp = NULL; 1648201021Sjkoshy last_end = (vm_offset_t) 0; 1649201021Sjkoshy fullpath = freepath = NULL; 1650201021Sjkoshy 1651201021Sjkoshy if ((vm = vmspace_acquire_ref(p)) == NULL) 1652201021Sjkoshy return; 1653201021Sjkoshy 1654201021Sjkoshy map = &vm->vm_map; 1655201021Sjkoshy vm_map_lock_read(map); 1656201021Sjkoshy 1657201021Sjkoshy for (entry = map->header.next; entry != &map->header; entry = entry->next) { 1658201021Sjkoshy 1659201021Sjkoshy if (entry == NULL) { 1660201021Sjkoshy PMCDBG(LOG,OPS,2, "hwpmc: vm_map entry unexpectedly " 1661201021Sjkoshy "NULL! pid=%d vm_map=%p\n", p->p_pid, map); 1662201021Sjkoshy break; 1663201021Sjkoshy } 1664201021Sjkoshy 1665201021Sjkoshy /* 1666201021Sjkoshy * We only care about executable map entries. 1667201021Sjkoshy */ 1668201021Sjkoshy if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 1669201021Sjkoshy !(entry->protection & VM_PROT_EXECUTE) || 1670201021Sjkoshy (entry->object.vm_object == NULL)) { 1671201021Sjkoshy continue; 1672201021Sjkoshy } 1673201021Sjkoshy 1674201021Sjkoshy obj = entry->object.vm_object; 1675201021Sjkoshy VM_OBJECT_LOCK(obj); 1676201021Sjkoshy 1677201021Sjkoshy /* 1678201021Sjkoshy * Walk the backing_object list to find the base 1679201021Sjkoshy * (non-shadowed) vm_object. 1680201021Sjkoshy */ 1681201021Sjkoshy for (lobj = tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 1682201021Sjkoshy if (tobj != obj) 1683201021Sjkoshy VM_OBJECT_LOCK(tobj); 1684201021Sjkoshy if (lobj != obj) 1685201021Sjkoshy VM_OBJECT_UNLOCK(lobj); 1686201021Sjkoshy lobj = tobj; 1687201021Sjkoshy } 1688201021Sjkoshy 1689201021Sjkoshy /* 1690201021Sjkoshy * At this point lobj is the base vm_object and it is locked. 1691201021Sjkoshy */ 1692201021Sjkoshy if (lobj == NULL) { 1693201021Sjkoshy PMCDBG(LOG,OPS,2, "hwpmc: lobj unexpectedly NULL! pid=%d " 1694201021Sjkoshy "vm_map=%p vm_obj=%p\n", p->p_pid, map, obj); 1695201021Sjkoshy VM_OBJECT_UNLOCK(obj); 1696201021Sjkoshy continue; 1697201021Sjkoshy } 1698201021Sjkoshy 1699201021Sjkoshy if (lobj->type != OBJT_VNODE || lobj->handle == NULL) { 1700201021Sjkoshy if (lobj != obj) 1701201021Sjkoshy VM_OBJECT_UNLOCK(lobj); 1702201021Sjkoshy VM_OBJECT_UNLOCK(obj); 1703201021Sjkoshy continue; 1704201021Sjkoshy } 1705201021Sjkoshy 1706201021Sjkoshy /* 1707201021Sjkoshy * Skip contiguous regions that point to the same 1708201021Sjkoshy * vnode, so we don't emit redundant MAP-IN 1709201021Sjkoshy * directives. 1710201021Sjkoshy */ 1711201021Sjkoshy if (entry->start == last_end && lobj->handle == last_vp) { 1712201021Sjkoshy last_end = entry->end; 1713201021Sjkoshy if (lobj != obj) 1714201021Sjkoshy VM_OBJECT_UNLOCK(lobj); 1715201021Sjkoshy VM_OBJECT_UNLOCK(obj); 1716201021Sjkoshy continue; 1717201021Sjkoshy } 1718201021Sjkoshy 1719201021Sjkoshy /* 1720201021Sjkoshy * We don't want to keep the proc's vm_map or this 1721201021Sjkoshy * vm_object locked while we walk the pathname, since 1722201021Sjkoshy * vn_fullpath() can sleep. However, if we drop the 1723201021Sjkoshy * lock, it's possible for concurrent activity to 1724201021Sjkoshy * modify the vm_map list. To protect against this, 1725201021Sjkoshy * we save the vm_map timestamp before we release the 1726201021Sjkoshy * lock, and check it after we reacquire the lock 1727201021Sjkoshy * below. 1728201021Sjkoshy */ 1729201021Sjkoshy start_addr = entry->start; 1730201021Sjkoshy last_end = entry->end; 1731201021Sjkoshy last_timestamp = map->timestamp; 1732201021Sjkoshy vm_map_unlock_read(map); 1733201021Sjkoshy 1734201021Sjkoshy vp = lobj->handle; 1735201021Sjkoshy vref(vp); 1736201021Sjkoshy if (lobj != obj) 1737201021Sjkoshy VM_OBJECT_UNLOCK(lobj); 1738201021Sjkoshy 1739201021Sjkoshy VM_OBJECT_UNLOCK(obj); 1740201021Sjkoshy 1741201021Sjkoshy freepath = NULL; 1742201021Sjkoshy pmc_getfilename(vp, &fullpath, &freepath); 1743201021Sjkoshy last_vp = vp; 1744201151Sjkoshy 1745201151Sjkoshy locked = VFS_LOCK_GIANT(vp->v_mount); 1746201021Sjkoshy vrele(vp); 1747201151Sjkoshy VFS_UNLOCK_GIANT(locked); 1748201151Sjkoshy 1749201021Sjkoshy vp = NULL; 1750201021Sjkoshy pmclog_process_map_in(po, p->p_pid, start_addr, fullpath); 1751201021Sjkoshy if (freepath) 1752201021Sjkoshy free(freepath, M_TEMP); 1753201021Sjkoshy 1754201021Sjkoshy vm_map_lock_read(map); 1755201021Sjkoshy 1756201021Sjkoshy /* 1757201021Sjkoshy * If our saved timestamp doesn't match, this means 1758201021Sjkoshy * that the vm_map was modified out from under us and 1759201021Sjkoshy * we can't trust our current "entry" pointer. Do a 1760201021Sjkoshy * new lookup for this entry. If there is no entry 1761201021Sjkoshy * for this address range, vm_map_lookup_entry() will 1762201021Sjkoshy * return the previous one, so we always want to go to 1763201021Sjkoshy * entry->next on the next loop iteration. 1764201021Sjkoshy * 1765201021Sjkoshy * There is an edge condition here that can occur if 1766201021Sjkoshy * there is no entry at or before this address. In 1767201021Sjkoshy * this situation, vm_map_lookup_entry returns 1768201021Sjkoshy * &map->header, which would cause our loop to abort 1769201021Sjkoshy * without processing the rest of the map. However, 1770201021Sjkoshy * in practice this will never happen for process 1771201021Sjkoshy * vm_map. This is because the executable's text 1772201021Sjkoshy * segment is the first mapping in the proc's address 1773201021Sjkoshy * space, and this mapping is never removed until the 1774201021Sjkoshy * process exits, so there will always be a non-header 1775201021Sjkoshy * entry at or before the requested address for 1776201021Sjkoshy * vm_map_lookup_entry to return. 1777201021Sjkoshy */ 1778201021Sjkoshy if (map->timestamp != last_timestamp) 1779201021Sjkoshy vm_map_lookup_entry(map, last_end - 1, &entry); 1780201021Sjkoshy } 1781201021Sjkoshy 1782201021Sjkoshy vm_map_unlock_read(map); 1783201021Sjkoshy vmspace_free(vm); 1784201021Sjkoshy return; 1785174395Sjkoshy} 1786174395Sjkoshy 1787174395Sjkoshy/* 1788174395Sjkoshy * Log mappings for all processes in the system. 1789174395Sjkoshy */ 1790174395Sjkoshy 1791174395Sjkoshystatic void 1792174395Sjkoshypmc_log_all_process_mappings(struct pmc_owner *po) 1793174395Sjkoshy{ 1794174395Sjkoshy struct proc *p, *top; 1795174395Sjkoshy 1796174395Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1797174395Sjkoshy 1798174395Sjkoshy if ((p = pfind(1)) == NULL) 1799174395Sjkoshy panic("[pmc,%d] Cannot find init", __LINE__); 1800174395Sjkoshy 1801174395Sjkoshy PROC_UNLOCK(p); 1802174395Sjkoshy 1803174395Sjkoshy sx_slock(&proctree_lock); 1804174395Sjkoshy 1805174395Sjkoshy top = p; 1806174395Sjkoshy 1807174395Sjkoshy for (;;) { 1808174395Sjkoshy pmc_log_process_mappings(po, p); 1809174395Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1810174395Sjkoshy p = LIST_FIRST(&p->p_children); 1811174395Sjkoshy else for (;;) { 1812174395Sjkoshy if (p == top) 1813174395Sjkoshy goto done; 1814174395Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1815174395Sjkoshy p = LIST_NEXT(p, p_sibling); 1816174395Sjkoshy break; 1817174395Sjkoshy } 1818174395Sjkoshy p = p->p_pptr; 1819174395Sjkoshy } 1820174395Sjkoshy } 1821174395Sjkoshy done: 1822174395Sjkoshy sx_sunlock(&proctree_lock); 1823174395Sjkoshy} 1824174395Sjkoshy 1825174395Sjkoshy/* 1826147191Sjkoshy * The 'hook' invoked from the kernel proper 1827147191Sjkoshy */ 1828147191Sjkoshy 1829147191Sjkoshy 1830153110Sru#ifdef DEBUG 1831147191Sjkoshyconst char *pmc_hooknames[] = { 1832157144Sjkoshy /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */ 1833147191Sjkoshy "", 1834147191Sjkoshy "EXEC", 1835147191Sjkoshy "CSW-IN", 1836147191Sjkoshy "CSW-OUT", 1837157144Sjkoshy "SAMPLE", 1838157144Sjkoshy "KLDLOAD", 1839157144Sjkoshy "KLDUNLOAD", 1840157144Sjkoshy "MMAP", 1841174395Sjkoshy "MUNMAP", 1842233628Sfabient "CALLCHAIN-NMI", 1843233628Sfabient "CALLCHAIN-SOFT", 1844233628Sfabient "SOFTSAMPLING" 1845147191Sjkoshy}; 1846147191Sjkoshy#endif 1847147191Sjkoshy 1848147191Sjkoshystatic int 1849147191Sjkoshypmc_hook_handler(struct thread *td, int function, void *arg) 1850147191Sjkoshy{ 1851147191Sjkoshy 1852147191Sjkoshy PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1853147191Sjkoshy pmc_hooknames[function], arg); 1854147191Sjkoshy 1855147191Sjkoshy switch (function) 1856147191Sjkoshy { 1857147191Sjkoshy 1858147191Sjkoshy /* 1859145256Sjkoshy * Process exec() 1860145256Sjkoshy */ 1861145256Sjkoshy 1862145256Sjkoshy case PMC_FN_PROCESS_EXEC: 1863145256Sjkoshy { 1864147191Sjkoshy char *fullpath, *freepath; 1865145256Sjkoshy unsigned int ri; 1866147191Sjkoshy int is_using_hwpmcs; 1867145256Sjkoshy struct pmc *pm; 1868145256Sjkoshy struct proc *p; 1869145256Sjkoshy struct pmc_owner *po; 1870145256Sjkoshy struct pmc_process *pp; 1871147708Sjkoshy struct pmckern_procexec *pk; 1872145256Sjkoshy 1873145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1874145256Sjkoshy 1875147191Sjkoshy p = td->td_proc; 1876147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1877147191Sjkoshy 1878147708Sjkoshy pk = (struct pmckern_procexec *) arg; 1879147708Sjkoshy 1880147191Sjkoshy /* Inform owners of SS mode PMCs of the exec event. */ 1881147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1882147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1883147708Sjkoshy pmclog_process_procexec(po, PMC_ID_INVALID, 1884147708Sjkoshy p->p_pid, pk->pm_entryaddr, fullpath); 1885147191Sjkoshy 1886147191Sjkoshy PROC_LOCK(p); 1887147191Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1888147191Sjkoshy PROC_UNLOCK(p); 1889147191Sjkoshy 1890147191Sjkoshy if (!is_using_hwpmcs) { 1891147191Sjkoshy if (freepath) 1892184205Sdes free(freepath, M_TEMP); 1893147191Sjkoshy break; 1894147191Sjkoshy } 1895147191Sjkoshy 1896145256Sjkoshy /* 1897145256Sjkoshy * PMCs are not inherited across an exec(): remove any 1898145256Sjkoshy * PMCs that this process is the owner of. 1899145256Sjkoshy */ 1900145256Sjkoshy 1901145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1902145256Sjkoshy pmc_remove_owner(po); 1903147191Sjkoshy pmc_destroy_owner_descriptor(po); 1904145256Sjkoshy } 1905145256Sjkoshy 1906145256Sjkoshy /* 1907154483Sjkoshy * If the process being exec'ed is not the target of any 1908154483Sjkoshy * PMC, we are done. 1909145256Sjkoshy */ 1910154483Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 1911154483Sjkoshy if (freepath) 1912184205Sdes free(freepath, M_TEMP); 1913145256Sjkoshy break; 1914154483Sjkoshy } 1915145256Sjkoshy 1916147191Sjkoshy /* 1917147191Sjkoshy * Log the exec event to all monitoring owners. Skip 1918147191Sjkoshy * owners who have already recieved the event because 1919154483Sjkoshy * they had system sampling PMCs active. 1920147191Sjkoshy */ 1921147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1922147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1923147191Sjkoshy po = pm->pm_owner; 1924147191Sjkoshy if (po->po_sscount == 0 && 1925147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 1926147708Sjkoshy pmclog_process_procexec(po, pm->pm_id, 1927147708Sjkoshy p->p_pid, pk->pm_entryaddr, 1928147191Sjkoshy fullpath); 1929147191Sjkoshy } 1930147191Sjkoshy 1931147191Sjkoshy if (freepath) 1932184205Sdes free(freepath, M_TEMP); 1933147191Sjkoshy 1934145256Sjkoshy 1935145256Sjkoshy PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 1936147708Sjkoshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1937145256Sjkoshy 1938147708Sjkoshy if (pk->pm_credentialschanged == 0) /* no change */ 1939145256Sjkoshy break; 1940145256Sjkoshy 1941145256Sjkoshy /* 1942145256Sjkoshy * If the newly exec()'ed process has a different credential 1943145256Sjkoshy * than before, allow it to be the target of a PMC only if 1944145256Sjkoshy * the PMC's owner has sufficient priviledge. 1945145256Sjkoshy */ 1946145256Sjkoshy 1947145256Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1948145256Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1949145256Sjkoshy if (pmc_can_attach(pm, td->td_proc) != 0) 1950145256Sjkoshy pmc_detach_one_process(td->td_proc, 1951145256Sjkoshy pm, PMC_FLAG_NONE); 1952145256Sjkoshy 1953198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1954145256Sjkoshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1955145256Sjkoshy pp->pp_refcnt, pp)); 1956145256Sjkoshy 1957145256Sjkoshy /* 1958145256Sjkoshy * If this process is no longer the target of any 1959145256Sjkoshy * PMCs, we can remove the process entry and free 1960145256Sjkoshy * up space. 1961145256Sjkoshy */ 1962145256Sjkoshy 1963145256Sjkoshy if (pp->pp_refcnt == 0) { 1964145256Sjkoshy pmc_remove_process_descriptor(pp); 1965184205Sdes free(pp, M_PMC); 1966147191Sjkoshy break; 1967145256Sjkoshy } 1968145256Sjkoshy 1969145256Sjkoshy } 1970145256Sjkoshy break; 1971145256Sjkoshy 1972145256Sjkoshy case PMC_FN_CSW_IN: 1973147191Sjkoshy pmc_process_csw_in(td); 1974147191Sjkoshy break; 1975145256Sjkoshy 1976147191Sjkoshy case PMC_FN_CSW_OUT: 1977147191Sjkoshy pmc_process_csw_out(td); 1978147191Sjkoshy break; 1979145256Sjkoshy 1980145256Sjkoshy /* 1981147191Sjkoshy * Process accumulated PC samples. 1982147191Sjkoshy * 1983147191Sjkoshy * This function is expected to be called by hardclock() for 1984147191Sjkoshy * each CPU that has accumulated PC samples. 1985147191Sjkoshy * 1986147191Sjkoshy * This function is to be executed on the CPU whose samples 1987147191Sjkoshy * are being processed. 1988145256Sjkoshy */ 1989147191Sjkoshy case PMC_FN_DO_SAMPLES: 1990145256Sjkoshy 1991145256Sjkoshy /* 1992147191Sjkoshy * Clear the cpu specific bit in the CPU mask before 1993147191Sjkoshy * do the rest of the processing. If the NMI handler 1994147191Sjkoshy * gets invoked after the "atomic_clear_int()" call 1995147191Sjkoshy * below but before "pmc_process_samples()" gets 1996147191Sjkoshy * around to processing the interrupt, then we will 1997147191Sjkoshy * come back here at the next hardclock() tick (and 1998147191Sjkoshy * may find nothing to do if "pmc_process_samples()" 1999147191Sjkoshy * had already processed the interrupt). We don't 2000147191Sjkoshy * lose the interrupt sample. 2001145256Sjkoshy */ 2002222813Sattilio CPU_CLR_ATOMIC(PCPU_GET(cpuid), &pmc_cpumask); 2003233628Sfabient pmc_process_samples(PCPU_GET(cpuid), PMC_HR); 2004233628Sfabient pmc_process_samples(PCPU_GET(cpuid), PMC_SR); 2005147191Sjkoshy break; 2006145256Sjkoshy 2007157144Sjkoshy 2008157144Sjkoshy case PMC_FN_KLD_LOAD: 2009157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 2010157144Sjkoshy pmc_process_kld_load((struct pmckern_map_in *) arg); 2011157144Sjkoshy break; 2012157144Sjkoshy 2013157144Sjkoshy case PMC_FN_KLD_UNLOAD: 2014157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 2015157144Sjkoshy pmc_process_kld_unload((struct pmckern_map_out *) arg); 2016157144Sjkoshy break; 2017157144Sjkoshy 2018157144Sjkoshy case PMC_FN_MMAP: 2019157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 2020157144Sjkoshy pmc_process_mmap(td, (struct pmckern_map_in *) arg); 2021157144Sjkoshy break; 2022157144Sjkoshy 2023157144Sjkoshy case PMC_FN_MUNMAP: 2024157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 2025157144Sjkoshy pmc_process_munmap(td, (struct pmckern_map_out *) arg); 2026157144Sjkoshy break; 2027157144Sjkoshy 2028174395Sjkoshy case PMC_FN_USER_CALLCHAIN: 2029174395Sjkoshy /* 2030174395Sjkoshy * Record a call chain. 2031174395Sjkoshy */ 2032186037Sjkoshy KASSERT(td == curthread, ("[pmc,%d] td != curthread", 2033186037Sjkoshy __LINE__)); 2034233628Sfabient 2035233628Sfabient pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_HR, 2036174395Sjkoshy (struct trapframe *) arg); 2037186037Sjkoshy td->td_pflags &= ~TDP_CALLCHAIN; 2038174395Sjkoshy break; 2039174395Sjkoshy 2040233628Sfabient case PMC_FN_USER_CALLCHAIN_SOFT: 2041233628Sfabient /* 2042233628Sfabient * Record a call chain. 2043233628Sfabient */ 2044233628Sfabient KASSERT(td == curthread, ("[pmc,%d] td != curthread", 2045233628Sfabient __LINE__)); 2046233628Sfabient pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_SR, 2047233628Sfabient (struct trapframe *) arg); 2048233628Sfabient td->td_pflags &= ~TDP_CALLCHAIN; 2049233628Sfabient break; 2050233628Sfabient 2051233628Sfabient case PMC_FN_SOFT_SAMPLING: 2052233628Sfabient /* 2053233628Sfabient * Call soft PMC sampling intr. 2054233628Sfabient */ 2055233628Sfabient pmc_soft_intr((struct pmckern_soft *) arg); 2056233628Sfabient break; 2057233628Sfabient 2058145256Sjkoshy default: 2059153110Sru#ifdef DEBUG 2060145256Sjkoshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 2061145256Sjkoshy#endif 2062145256Sjkoshy break; 2063145256Sjkoshy 2064145256Sjkoshy } 2065145256Sjkoshy 2066145256Sjkoshy return 0; 2067145256Sjkoshy} 2068145256Sjkoshy 2069145256Sjkoshy/* 2070145256Sjkoshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 2071145256Sjkoshy */ 2072145256Sjkoshy 2073145256Sjkoshystatic struct pmc_owner * 2074145256Sjkoshypmc_allocate_owner_descriptor(struct proc *p) 2075145256Sjkoshy{ 2076145256Sjkoshy uint32_t hindex; 2077145256Sjkoshy struct pmc_owner *po; 2078145256Sjkoshy struct pmc_ownerhash *poh; 2079145256Sjkoshy 2080145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2081145256Sjkoshy poh = &pmc_ownerhash[hindex]; 2082145256Sjkoshy 2083145256Sjkoshy /* allocate space for N pointers and one descriptor struct */ 2084184802Sjkoshy po = malloc(sizeof(struct pmc_owner), M_PMC, M_WAITOK|M_ZERO); 2085201021Sjkoshy po->po_sscount = po->po_error = po->po_flags = po->po_logprocmaps = 0; 2086147191Sjkoshy po->po_file = NULL; 2087145256Sjkoshy po->po_owner = p; 2088147191Sjkoshy po->po_kthread = NULL; 2089145256Sjkoshy LIST_INIT(&po->po_pmcs); 2090145256Sjkoshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 2091145256Sjkoshy 2092147191Sjkoshy TAILQ_INIT(&po->po_logbuffers); 2093168856Sjkoshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN); 2094147191Sjkoshy 2095145256Sjkoshy PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 2096145256Sjkoshy p, p->p_pid, p->p_comm, po); 2097145256Sjkoshy 2098145256Sjkoshy return po; 2099145256Sjkoshy} 2100145256Sjkoshy 2101147191Sjkoshystatic void 2102147191Sjkoshypmc_destroy_owner_descriptor(struct pmc_owner *po) 2103147191Sjkoshy{ 2104147191Sjkoshy 2105147191Sjkoshy PMCDBG(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 2106147191Sjkoshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 2107147191Sjkoshy 2108147191Sjkoshy mtx_destroy(&po->po_mtx); 2109184205Sdes free(po, M_PMC); 2110147191Sjkoshy} 2111147191Sjkoshy 2112145256Sjkoshy/* 2113145256Sjkoshy * find the descriptor corresponding to process 'p', adding or removing it 2114145256Sjkoshy * as specified by 'mode'. 2115145256Sjkoshy */ 2116145256Sjkoshy 2117145256Sjkoshystatic struct pmc_process * 2118145256Sjkoshypmc_find_process_descriptor(struct proc *p, uint32_t mode) 2119145256Sjkoshy{ 2120145256Sjkoshy uint32_t hindex; 2121145256Sjkoshy struct pmc_process *pp, *ppnew; 2122145256Sjkoshy struct pmc_processhash *pph; 2123145256Sjkoshy 2124145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 2125145256Sjkoshy pph = &pmc_processhash[hindex]; 2126145256Sjkoshy 2127145256Sjkoshy ppnew = NULL; 2128145256Sjkoshy 2129145256Sjkoshy /* 2130145256Sjkoshy * Pre-allocate memory in the FIND_ALLOCATE case since we 2131145256Sjkoshy * cannot call malloc(9) once we hold a spin lock. 2132145256Sjkoshy */ 2133184802Sjkoshy if (mode & PMC_FLAG_ALLOCATE) 2134184214Sdes ppnew = malloc(sizeof(struct pmc_process) + md->pmd_npmc * 2135184802Sjkoshy sizeof(struct pmc_targetstate), M_PMC, M_WAITOK|M_ZERO); 2136145256Sjkoshy 2137145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 2138145256Sjkoshy LIST_FOREACH(pp, pph, pp_next) 2139145256Sjkoshy if (pp->pp_proc == p) 2140145256Sjkoshy break; 2141145256Sjkoshy 2142145256Sjkoshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 2143145256Sjkoshy LIST_REMOVE(pp, pp_next); 2144145256Sjkoshy 2145145256Sjkoshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 2146145256Sjkoshy ppnew != NULL) { 2147145256Sjkoshy ppnew->pp_proc = p; 2148145256Sjkoshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 2149145256Sjkoshy pp = ppnew; 2150145256Sjkoshy ppnew = NULL; 2151145256Sjkoshy } 2152145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 2153145256Sjkoshy 2154145256Sjkoshy if (pp != NULL && ppnew != NULL) 2155184205Sdes free(ppnew, M_PMC); 2156145256Sjkoshy 2157145256Sjkoshy return pp; 2158145256Sjkoshy} 2159145256Sjkoshy 2160145256Sjkoshy/* 2161145256Sjkoshy * remove a process descriptor from the process hash table. 2162145256Sjkoshy */ 2163145256Sjkoshy 2164145256Sjkoshystatic void 2165145256Sjkoshypmc_remove_process_descriptor(struct pmc_process *pp) 2166145256Sjkoshy{ 2167145256Sjkoshy KASSERT(pp->pp_refcnt == 0, 2168145256Sjkoshy ("[pmc,%d] Removing process descriptor %p with count %d", 2169145256Sjkoshy __LINE__, pp, pp->pp_refcnt)); 2170145256Sjkoshy 2171145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 2172145256Sjkoshy LIST_REMOVE(pp, pp_next); 2173145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 2174145256Sjkoshy} 2175145256Sjkoshy 2176145256Sjkoshy 2177145256Sjkoshy/* 2178145256Sjkoshy * find an owner descriptor corresponding to proc 'p' 2179145256Sjkoshy */ 2180145256Sjkoshy 2181145256Sjkoshystatic struct pmc_owner * 2182145256Sjkoshypmc_find_owner_descriptor(struct proc *p) 2183145256Sjkoshy{ 2184145256Sjkoshy uint32_t hindex; 2185145256Sjkoshy struct pmc_owner *po; 2186145256Sjkoshy struct pmc_ownerhash *poh; 2187145256Sjkoshy 2188145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2189145256Sjkoshy poh = &pmc_ownerhash[hindex]; 2190145256Sjkoshy 2191145256Sjkoshy po = NULL; 2192145256Sjkoshy LIST_FOREACH(po, poh, po_next) 2193145256Sjkoshy if (po->po_owner == p) 2194145256Sjkoshy break; 2195145256Sjkoshy 2196145256Sjkoshy PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 2197145256Sjkoshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 2198145256Sjkoshy 2199145256Sjkoshy return po; 2200145256Sjkoshy} 2201145256Sjkoshy 2202145256Sjkoshy/* 2203145256Sjkoshy * pmc_allocate_pmc_descriptor 2204145256Sjkoshy * 2205145256Sjkoshy * Allocate a pmc descriptor and initialize its 2206145256Sjkoshy * fields. 2207145256Sjkoshy */ 2208145256Sjkoshy 2209145256Sjkoshystatic struct pmc * 2210145256Sjkoshypmc_allocate_pmc_descriptor(void) 2211145256Sjkoshy{ 2212145256Sjkoshy struct pmc *pmc; 2213145256Sjkoshy 2214184802Sjkoshy pmc = malloc(sizeof(struct pmc), M_PMC, M_WAITOK|M_ZERO); 2215145256Sjkoshy 2216145256Sjkoshy if (pmc != NULL) { 2217145256Sjkoshy pmc->pm_owner = NULL; 2218145256Sjkoshy LIST_INIT(&pmc->pm_targets); 2219145256Sjkoshy } 2220145256Sjkoshy 2221145256Sjkoshy PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 2222145256Sjkoshy 2223145256Sjkoshy return pmc; 2224145256Sjkoshy} 2225145256Sjkoshy 2226145256Sjkoshy/* 2227145256Sjkoshy * Destroy a pmc descriptor. 2228145256Sjkoshy */ 2229145256Sjkoshy 2230145256Sjkoshystatic void 2231145256Sjkoshypmc_destroy_pmc_descriptor(struct pmc *pm) 2232145256Sjkoshy{ 2233145256Sjkoshy (void) pm; 2234145256Sjkoshy 2235153110Sru#ifdef DEBUG 2236145256Sjkoshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 2237145256Sjkoshy pm->pm_state == PMC_STATE_FREE, 2238145256Sjkoshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 2239145256Sjkoshy KASSERT(LIST_EMPTY(&pm->pm_targets), 2240145256Sjkoshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 2241145256Sjkoshy KASSERT(pm->pm_owner == NULL, 2242145256Sjkoshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 2243145256Sjkoshy KASSERT(pm->pm_runcount == 0, 2244145256Sjkoshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 2245145256Sjkoshy pm->pm_runcount)); 2246145256Sjkoshy#endif 2247145256Sjkoshy} 2248145256Sjkoshy 2249147191Sjkoshystatic void 2250147191Sjkoshypmc_wait_for_pmc_idle(struct pmc *pm) 2251147191Sjkoshy{ 2252233628Sfabient#ifdef DEBUG 2253147191Sjkoshy volatile int maxloop; 2254147191Sjkoshy 2255183266Sjkoshy maxloop = 100 * pmc_cpu_max(); 2256147191Sjkoshy#endif 2257147191Sjkoshy /* 2258147191Sjkoshy * Loop (with a forced context switch) till the PMC's runcount 2259147191Sjkoshy * comes down to zero. 2260147191Sjkoshy */ 2261147191Sjkoshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 2262233628Sfabient#ifdef DEBUG 2263147191Sjkoshy maxloop--; 2264147191Sjkoshy KASSERT(maxloop > 0, 2265147191Sjkoshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 2266147191Sjkoshy "pmc to be free", __LINE__, 2267147191Sjkoshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 2268147191Sjkoshy#endif 2269147191Sjkoshy pmc_force_context_switch(); 2270147191Sjkoshy } 2271147191Sjkoshy} 2272147191Sjkoshy 2273145256Sjkoshy/* 2274145256Sjkoshy * This function does the following things: 2275145256Sjkoshy * 2276145256Sjkoshy * - detaches the PMC from hardware 2277145256Sjkoshy * - unlinks all target threads that were attached to it 2278145256Sjkoshy * - removes the PMC from its owner's list 2279145256Sjkoshy * - destroy's the PMC private mutex 2280145256Sjkoshy * 2281145256Sjkoshy * Once this function completes, the given pmc pointer can be safely 2282145256Sjkoshy * FREE'd by the caller. 2283145256Sjkoshy */ 2284145256Sjkoshy 2285145256Sjkoshystatic void 2286145256Sjkoshypmc_release_pmc_descriptor(struct pmc *pm) 2287145256Sjkoshy{ 2288145774Sjkoshy enum pmc_mode mode; 2289145256Sjkoshy struct pmc_hw *phw; 2290184802Sjkoshy u_int adjri, ri, cpu; 2291147191Sjkoshy struct pmc_owner *po; 2292184802Sjkoshy struct pmc_binding pb; 2293145256Sjkoshy struct pmc_process *pp; 2294184802Sjkoshy struct pmc_classdep *pcd; 2295145256Sjkoshy struct pmc_target *ptgt, *tmp; 2296145256Sjkoshy 2297145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2298145256Sjkoshy 2299145256Sjkoshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 2300145256Sjkoshy 2301145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2302184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2303145774Sjkoshy mode = PMC_TO_MODE(pm); 2304145256Sjkoshy 2305145256Sjkoshy PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 2306145774Sjkoshy mode); 2307145256Sjkoshy 2308145256Sjkoshy /* 2309145256Sjkoshy * First, we take the PMC off hardware. 2310145256Sjkoshy */ 2311145301Simp cpu = 0; 2312145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2313145256Sjkoshy 2314145256Sjkoshy /* 2315145256Sjkoshy * A system mode PMC runs on a specific CPU. Switch 2316145256Sjkoshy * to this CPU and turn hardware off. 2317145256Sjkoshy */ 2318145256Sjkoshy pmc_save_cpu_binding(&pb); 2319145256Sjkoshy 2320145774Sjkoshy cpu = PMC_TO_CPU(pm); 2321145256Sjkoshy 2322147191Sjkoshy pmc_select_cpu(cpu); 2323145256Sjkoshy 2324147191Sjkoshy /* switch off non-stalled CPUs */ 2325147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 2326147867Sjkoshy pm->pm_stalled == 0) { 2327145256Sjkoshy 2328145256Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 2329145256Sjkoshy 2330145256Sjkoshy KASSERT(phw->phw_pmc == pm, 2331145256Sjkoshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 2332145256Sjkoshy __LINE__, ri, phw->phw_pmc, pm)); 2333145256Sjkoshy PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 2334145256Sjkoshy 2335145256Sjkoshy critical_enter(); 2336184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 2337145256Sjkoshy critical_exit(); 2338145256Sjkoshy } 2339145256Sjkoshy 2340145256Sjkoshy PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 2341145256Sjkoshy 2342145256Sjkoshy critical_enter(); 2343184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 2344145256Sjkoshy critical_exit(); 2345145256Sjkoshy 2346147191Sjkoshy /* adjust the global and process count of SS mode PMCs */ 2347147191Sjkoshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 2348147191Sjkoshy po = pm->pm_owner; 2349147191Sjkoshy po->po_sscount--; 2350147191Sjkoshy if (po->po_sscount == 0) { 2351147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2352147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2353147191Sjkoshy } 2354147191Sjkoshy } 2355147191Sjkoshy 2356145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2357145256Sjkoshy 2358145256Sjkoshy pmc_restore_cpu_binding(&pb); 2359145256Sjkoshy 2360147191Sjkoshy /* 2361147191Sjkoshy * We could have references to this PMC structure in 2362147191Sjkoshy * the per-cpu sample queues. Wait for the queue to 2363147191Sjkoshy * drain. 2364147191Sjkoshy */ 2365147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2366147191Sjkoshy 2367145774Sjkoshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 2368145256Sjkoshy 2369145256Sjkoshy /* 2370145256Sjkoshy * A virtual PMC could be running on multiple CPUs at 2371145256Sjkoshy * a given instant. 2372145256Sjkoshy * 2373145256Sjkoshy * By marking its state as DELETED, we ensure that 2374145256Sjkoshy * this PMC is never further scheduled on hardware. 2375145256Sjkoshy * 2376145256Sjkoshy * Then we wait till all CPUs are done with this PMC. 2377145256Sjkoshy */ 2378145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2379145256Sjkoshy 2380145256Sjkoshy 2381147191Sjkoshy /* Wait for the PMCs runcount to come to zero. */ 2382147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2383145256Sjkoshy 2384145256Sjkoshy /* 2385145256Sjkoshy * At this point the PMC is off all CPUs and cannot be 2386145256Sjkoshy * freshly scheduled onto a CPU. It is now safe to 2387145256Sjkoshy * unlink all targets from this PMC. If a 2388145256Sjkoshy * process-record's refcount falls to zero, we remove 2389145256Sjkoshy * it from the hash table. The module-wide SX lock 2390145256Sjkoshy * protects us from races. 2391145256Sjkoshy */ 2392145256Sjkoshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 2393145256Sjkoshy pp = ptgt->pt_process; 2394145256Sjkoshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 2395145256Sjkoshy 2396145256Sjkoshy PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 2397145256Sjkoshy 2398145256Sjkoshy /* 2399145256Sjkoshy * If the target process record shows that no 2400145256Sjkoshy * PMCs are attached to it, reclaim its space. 2401145256Sjkoshy */ 2402145256Sjkoshy 2403145256Sjkoshy if (pp->pp_refcnt == 0) { 2404145256Sjkoshy pmc_remove_process_descriptor(pp); 2405184205Sdes free(pp, M_PMC); 2406145256Sjkoshy } 2407145256Sjkoshy } 2408145256Sjkoshy 2409145256Sjkoshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 2410145256Sjkoshy 2411145256Sjkoshy } 2412145256Sjkoshy 2413145256Sjkoshy /* 2414145256Sjkoshy * Release any MD resources 2415145256Sjkoshy */ 2416184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pm); 2417145256Sjkoshy 2418145256Sjkoshy /* 2419145256Sjkoshy * Update row disposition 2420145256Sjkoshy */ 2421145256Sjkoshy 2422145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 2423145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2424145256Sjkoshy else 2425145256Sjkoshy PMC_UNMARK_ROW_THREAD(ri); 2426145256Sjkoshy 2427145256Sjkoshy /* unlink from the owner's list */ 2428147191Sjkoshy if (pm->pm_owner) { 2429147191Sjkoshy LIST_REMOVE(pm, pm_next); 2430147191Sjkoshy pm->pm_owner = NULL; 2431147191Sjkoshy } 2432145256Sjkoshy 2433145256Sjkoshy pmc_destroy_pmc_descriptor(pm); 2434145256Sjkoshy} 2435145256Sjkoshy 2436145256Sjkoshy/* 2437145256Sjkoshy * Register an owner and a pmc. 2438145256Sjkoshy */ 2439145256Sjkoshy 2440145256Sjkoshystatic int 2441145256Sjkoshypmc_register_owner(struct proc *p, struct pmc *pmc) 2442145256Sjkoshy{ 2443145256Sjkoshy struct pmc_owner *po; 2444145256Sjkoshy 2445145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2446145256Sjkoshy 2447145774Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2448147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 2449145256Sjkoshy return ENOMEM; 2450145256Sjkoshy 2451145256Sjkoshy KASSERT(pmc->pm_owner == NULL, 2452145256Sjkoshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 2453145256Sjkoshy pmc->pm_owner = po; 2454145256Sjkoshy 2455147191Sjkoshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 2456145256Sjkoshy 2457145256Sjkoshy PROC_LOCK(p); 2458145256Sjkoshy p->p_flag |= P_HWPMC; 2459145256Sjkoshy PROC_UNLOCK(p); 2460145256Sjkoshy 2461147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 2462147191Sjkoshy pmclog_process_pmcallocate(pmc); 2463145256Sjkoshy 2464147191Sjkoshy PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2465147191Sjkoshy po, pmc); 2466147191Sjkoshy 2467145256Sjkoshy return 0; 2468145256Sjkoshy} 2469145256Sjkoshy 2470145256Sjkoshy/* 2471145256Sjkoshy * Return the current row disposition: 2472145256Sjkoshy * == 0 => FREE 2473145256Sjkoshy * > 0 => PROCESS MODE 2474145256Sjkoshy * < 0 => SYSTEM MODE 2475145256Sjkoshy */ 2476145256Sjkoshy 2477145256Sjkoshyint 2478145256Sjkoshypmc_getrowdisp(int ri) 2479145256Sjkoshy{ 2480145256Sjkoshy return pmc_pmcdisp[ri]; 2481145256Sjkoshy} 2482145256Sjkoshy 2483145256Sjkoshy/* 2484145256Sjkoshy * Check if a PMC at row index 'ri' can be allocated to the current 2485145256Sjkoshy * process. 2486145256Sjkoshy * 2487145256Sjkoshy * Allocation can fail if: 2488145256Sjkoshy * - the current process is already being profiled by a PMC at index 'ri', 2489145256Sjkoshy * attached to it via OP_PMCATTACH. 2490145256Sjkoshy * - the current process has already allocated a PMC at index 'ri' 2491145256Sjkoshy * via OP_ALLOCATE. 2492145256Sjkoshy */ 2493145256Sjkoshy 2494145256Sjkoshystatic int 2495145774Sjkoshypmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2496145256Sjkoshy{ 2497145774Sjkoshy enum pmc_mode mode; 2498145774Sjkoshy struct pmc *pm; 2499145256Sjkoshy struct pmc_owner *po; 2500145256Sjkoshy struct pmc_process *pp; 2501145256Sjkoshy 2502145774Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2503145774Sjkoshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2504145256Sjkoshy 2505145774Sjkoshy /* 2506145774Sjkoshy * We shouldn't have already allocated a process-mode PMC at 2507145774Sjkoshy * row index 'ri'. 2508145774Sjkoshy * 2509145774Sjkoshy * We shouldn't have allocated a system-wide PMC on the same 2510145774Sjkoshy * CPU and same RI. 2511145774Sjkoshy */ 2512145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2513147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2514145774Sjkoshy if (PMC_TO_ROWINDEX(pm) == ri) { 2515145774Sjkoshy mode = PMC_TO_MODE(pm); 2516145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) 2517145774Sjkoshy return EEXIST; 2518145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && 2519145774Sjkoshy (int) PMC_TO_CPU(pm) == cpu) 2520145774Sjkoshy return EEXIST; 2521145774Sjkoshy } 2522145774Sjkoshy } 2523145256Sjkoshy 2524145774Sjkoshy /* 2525145774Sjkoshy * We also shouldn't be the target of any PMC at this index 2526145774Sjkoshy * since otherwise a PMC_ATTACH to ourselves will fail. 2527145774Sjkoshy */ 2528145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2529145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc) 2530145256Sjkoshy return EEXIST; 2531145256Sjkoshy 2532145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2533145256Sjkoshy p, p->p_pid, p->p_comm, ri); 2534145256Sjkoshy 2535145256Sjkoshy return 0; 2536145256Sjkoshy} 2537145256Sjkoshy 2538145256Sjkoshy/* 2539145256Sjkoshy * Check if a given PMC at row index 'ri' can be currently used in 2540145256Sjkoshy * mode 'mode'. 2541145256Sjkoshy */ 2542145256Sjkoshy 2543145256Sjkoshystatic int 2544145256Sjkoshypmc_can_allocate_row(int ri, enum pmc_mode mode) 2545145256Sjkoshy{ 2546145256Sjkoshy enum pmc_disp disp; 2547145256Sjkoshy 2548145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2549145256Sjkoshy 2550145256Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2551145256Sjkoshy 2552145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2553145256Sjkoshy disp = PMC_DISP_STANDALONE; 2554145256Sjkoshy else 2555145256Sjkoshy disp = PMC_DISP_THREAD; 2556145256Sjkoshy 2557145256Sjkoshy /* 2558145256Sjkoshy * check disposition for PMC row 'ri': 2559145256Sjkoshy * 2560145256Sjkoshy * Expected disposition Row-disposition Result 2561145256Sjkoshy * 2562145256Sjkoshy * STANDALONE STANDALONE or FREE proceed 2563145256Sjkoshy * STANDALONE THREAD fail 2564145256Sjkoshy * THREAD THREAD or FREE proceed 2565145256Sjkoshy * THREAD STANDALONE fail 2566145256Sjkoshy */ 2567145256Sjkoshy 2568145256Sjkoshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2569145256Sjkoshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2570145256Sjkoshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2571145256Sjkoshy return EBUSY; 2572145256Sjkoshy 2573145256Sjkoshy /* 2574145256Sjkoshy * All OK 2575145256Sjkoshy */ 2576145256Sjkoshy 2577145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2578145256Sjkoshy 2579145256Sjkoshy return 0; 2580145256Sjkoshy 2581145256Sjkoshy} 2582145256Sjkoshy 2583145256Sjkoshy/* 2584145774Sjkoshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2585145256Sjkoshy */ 2586145256Sjkoshy 2587145256Sjkoshystatic struct pmc * 2588145256Sjkoshypmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2589145256Sjkoshy{ 2590147191Sjkoshy struct pmc *pm; 2591145256Sjkoshy 2592145774Sjkoshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2593145774Sjkoshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2594145774Sjkoshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2595145256Sjkoshy 2596147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2597147191Sjkoshy if (pm->pm_id == pmcid) 2598147191Sjkoshy return pm; 2599145256Sjkoshy 2600145256Sjkoshy return NULL; 2601145256Sjkoshy} 2602145256Sjkoshy 2603145256Sjkoshystatic int 2604145256Sjkoshypmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2605145256Sjkoshy{ 2606145256Sjkoshy 2607145256Sjkoshy struct pmc *pm; 2608145256Sjkoshy struct pmc_owner *po; 2609145256Sjkoshy 2610145256Sjkoshy PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid); 2611145256Sjkoshy 2612145256Sjkoshy if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) 2613145256Sjkoshy return ESRCH; 2614145256Sjkoshy 2615145256Sjkoshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2616145256Sjkoshy return EINVAL; 2617145256Sjkoshy 2618145256Sjkoshy PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2619145256Sjkoshy 2620145256Sjkoshy *pmc = pm; 2621145256Sjkoshy return 0; 2622145256Sjkoshy} 2623145256Sjkoshy 2624145256Sjkoshy/* 2625145256Sjkoshy * Start a PMC. 2626145256Sjkoshy */ 2627145256Sjkoshy 2628145256Sjkoshystatic int 2629145256Sjkoshypmc_start(struct pmc *pm) 2630145256Sjkoshy{ 2631145774Sjkoshy enum pmc_mode mode; 2632147191Sjkoshy struct pmc_owner *po; 2633145256Sjkoshy struct pmc_binding pb; 2634184802Sjkoshy struct pmc_classdep *pcd; 2635184802Sjkoshy int adjri, error, cpu, ri; 2636145256Sjkoshy 2637145256Sjkoshy KASSERT(pm != NULL, 2638145256Sjkoshy ("[pmc,%d] null pm", __LINE__)); 2639145256Sjkoshy 2640145774Sjkoshy mode = PMC_TO_MODE(pm); 2641145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2642184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2643184802Sjkoshy 2644145774Sjkoshy error = 0; 2645145256Sjkoshy 2646145774Sjkoshy PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2647145774Sjkoshy 2648147191Sjkoshy po = pm->pm_owner; 2649145256Sjkoshy 2650174395Sjkoshy /* 2651174395Sjkoshy * Disallow PMCSTART if a logfile is required but has not been 2652174395Sjkoshy * configured yet. 2653174395Sjkoshy */ 2654174395Sjkoshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2655174395Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2656184802Sjkoshy return (EDOOFUS); /* programming error */ 2657174395Sjkoshy 2658174395Sjkoshy /* 2659174395Sjkoshy * If this is a sampling mode PMC, log mapping information for 2660174395Sjkoshy * the kernel modules that are currently loaded. 2661174395Sjkoshy */ 2662174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2663174395Sjkoshy pmc_log_kernel_mappings(pm); 2664174395Sjkoshy 2665145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2666145256Sjkoshy 2667145256Sjkoshy /* 2668147191Sjkoshy * If a PMCATTACH has never been done on this PMC, 2669147191Sjkoshy * attach it to its owner process. 2670145256Sjkoshy */ 2671145256Sjkoshy 2672145256Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 2673147191Sjkoshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2674147191Sjkoshy pmc_attach_process(po->po_owner, pm); 2675145256Sjkoshy 2676145774Sjkoshy /* 2677147191Sjkoshy * If the PMC is attached to its owner, then force a context 2678147191Sjkoshy * switch to ensure that the MD state gets set correctly. 2679145256Sjkoshy */ 2680145256Sjkoshy 2681147191Sjkoshy if (error == 0) { 2682147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2683147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2684147191Sjkoshy pmc_force_context_switch(); 2685147191Sjkoshy } 2686147191Sjkoshy 2687184802Sjkoshy return (error); 2688147191Sjkoshy } 2689145256Sjkoshy 2690147191Sjkoshy 2691147191Sjkoshy /* 2692147191Sjkoshy * A system-wide PMC. 2693174395Sjkoshy * 2694147191Sjkoshy * Add the owner to the global list if this is a system-wide 2695147191Sjkoshy * sampling PMC. 2696147191Sjkoshy */ 2697147191Sjkoshy 2698147191Sjkoshy if (mode == PMC_MODE_SS) { 2699147191Sjkoshy if (po->po_sscount == 0) { 2700147191Sjkoshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2701147191Sjkoshy atomic_add_rel_int(&pmc_ss_count, 1); 2702147191Sjkoshy PMCDBG(PMC,OPS,1, "po=%p in global list", po); 2703147191Sjkoshy } 2704147191Sjkoshy po->po_sscount++; 2705145256Sjkoshy 2706207484Srstone /* 2707207484Srstone * Log mapping information for all existing processes in the 2708207484Srstone * system. Subsequent mappings are logged as they happen; 2709207484Srstone * see pmc_process_mmap(). 2710207484Srstone */ 2711207484Srstone if (po->po_logprocmaps == 0) { 2712207484Srstone pmc_log_all_process_mappings(po); 2713207484Srstone po->po_logprocmaps = 1; 2714207484Srstone } 2715201021Sjkoshy } 2716157144Sjkoshy 2717145256Sjkoshy /* 2718147191Sjkoshy * Move to the CPU associated with this 2719145256Sjkoshy * PMC, and start the hardware. 2720145256Sjkoshy */ 2721145256Sjkoshy 2722145256Sjkoshy pmc_save_cpu_binding(&pb); 2723145256Sjkoshy 2724145774Sjkoshy cpu = PMC_TO_CPU(pm); 2725145256Sjkoshy 2726183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2727184802Sjkoshy return (ENXIO); 2728145256Sjkoshy 2729145256Sjkoshy pmc_select_cpu(cpu); 2730145256Sjkoshy 2731145256Sjkoshy /* 2732145256Sjkoshy * global PMCs are configured at allocation time 2733145256Sjkoshy * so write out the initial value and start the PMC. 2734145256Sjkoshy */ 2735145256Sjkoshy 2736147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2737147191Sjkoshy 2738145774Sjkoshy critical_enter(); 2739184802Sjkoshy if ((error = pcd->pcd_write_pmc(cpu, adjri, 2740145774Sjkoshy PMC_IS_SAMPLING_MODE(mode) ? 2741145256Sjkoshy pm->pm_sc.pm_reloadcount : 2742145256Sjkoshy pm->pm_sc.pm_initial)) == 0) 2743184802Sjkoshy error = pcd->pcd_start_pmc(cpu, adjri); 2744145774Sjkoshy critical_exit(); 2745145256Sjkoshy 2746145256Sjkoshy pmc_restore_cpu_binding(&pb); 2747145256Sjkoshy 2748184802Sjkoshy return (error); 2749145256Sjkoshy} 2750145256Sjkoshy 2751145256Sjkoshy/* 2752145256Sjkoshy * Stop a PMC. 2753145256Sjkoshy */ 2754145256Sjkoshy 2755145256Sjkoshystatic int 2756145256Sjkoshypmc_stop(struct pmc *pm) 2757145256Sjkoshy{ 2758147191Sjkoshy struct pmc_owner *po; 2759145256Sjkoshy struct pmc_binding pb; 2760184802Sjkoshy struct pmc_classdep *pcd; 2761184802Sjkoshy int adjri, cpu, error, ri; 2762145256Sjkoshy 2763145256Sjkoshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2764145256Sjkoshy 2765145774Sjkoshy PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2766145774Sjkoshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2767145256Sjkoshy 2768145256Sjkoshy pm->pm_state = PMC_STATE_STOPPED; 2769145256Sjkoshy 2770145256Sjkoshy /* 2771145256Sjkoshy * If the PMC is a virtual mode one, changing the state to 2772145256Sjkoshy * non-RUNNING is enough to ensure that the PMC never gets 2773145256Sjkoshy * scheduled. 2774145256Sjkoshy * 2775145256Sjkoshy * If this PMC is current running on a CPU, then it will 2776145256Sjkoshy * handled correctly at the time its target process is context 2777145256Sjkoshy * switched out. 2778145256Sjkoshy */ 2779145256Sjkoshy 2780145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2781145256Sjkoshy return 0; 2782145256Sjkoshy 2783145256Sjkoshy /* 2784145256Sjkoshy * A system-mode PMC. Move to the CPU associated with 2785145256Sjkoshy * this PMC, and stop the hardware. We update the 2786145256Sjkoshy * 'initial count' so that a subsequent PMCSTART will 2787145256Sjkoshy * resume counting from the current hardware count. 2788145256Sjkoshy */ 2789145256Sjkoshy 2790145256Sjkoshy pmc_save_cpu_binding(&pb); 2791145256Sjkoshy 2792145774Sjkoshy cpu = PMC_TO_CPU(pm); 2793145256Sjkoshy 2794183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 2795145774Sjkoshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2796145774Sjkoshy 2797183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2798145256Sjkoshy return ENXIO; 2799145256Sjkoshy 2800145256Sjkoshy pmc_select_cpu(cpu); 2801145256Sjkoshy 2802145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2803184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2804145256Sjkoshy 2805145774Sjkoshy critical_enter(); 2806184802Sjkoshy if ((error = pcd->pcd_stop_pmc(cpu, adjri)) == 0) 2807184802Sjkoshy error = pcd->pcd_read_pmc(cpu, adjri, &pm->pm_sc.pm_initial); 2808145774Sjkoshy critical_exit(); 2809145774Sjkoshy 2810145256Sjkoshy pmc_restore_cpu_binding(&pb); 2811145256Sjkoshy 2812147191Sjkoshy po = pm->pm_owner; 2813147191Sjkoshy 2814147191Sjkoshy /* remove this owner from the global list of SS PMC owners */ 2815147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2816147191Sjkoshy po->po_sscount--; 2817147191Sjkoshy if (po->po_sscount == 0) { 2818147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2819147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2820147191Sjkoshy PMCDBG(PMC,OPS,2,"po=%p removed from global list", po); 2821147191Sjkoshy } 2822147191Sjkoshy } 2823147191Sjkoshy 2824184802Sjkoshy return (error); 2825145256Sjkoshy} 2826145256Sjkoshy 2827145256Sjkoshy 2828153110Sru#ifdef DEBUG 2829145256Sjkoshystatic const char *pmc_op_to_name[] = { 2830145256Sjkoshy#undef __PMC_OP 2831145256Sjkoshy#define __PMC_OP(N, D) #N , 2832145256Sjkoshy __PMC_OPS() 2833145256Sjkoshy NULL 2834145256Sjkoshy}; 2835145256Sjkoshy#endif 2836145256Sjkoshy 2837145256Sjkoshy/* 2838145256Sjkoshy * The syscall interface 2839145256Sjkoshy */ 2840145256Sjkoshy 2841145256Sjkoshy#define PMC_GET_SX_XLOCK(...) do { \ 2842145256Sjkoshy sx_xlock(&pmc_sx); \ 2843145256Sjkoshy if (pmc_hook == NULL) { \ 2844145256Sjkoshy sx_xunlock(&pmc_sx); \ 2845145256Sjkoshy return __VA_ARGS__; \ 2846145256Sjkoshy } \ 2847145256Sjkoshy} while (0) 2848145256Sjkoshy 2849145256Sjkoshy#define PMC_DOWNGRADE_SX() do { \ 2850145256Sjkoshy sx_downgrade(&pmc_sx); \ 2851145256Sjkoshy is_sx_downgraded = 1; \ 2852145256Sjkoshy} while (0) 2853145256Sjkoshy 2854145256Sjkoshystatic int 2855145256Sjkoshypmc_syscall_handler(struct thread *td, void *syscall_args) 2856145256Sjkoshy{ 2857195005Sattilio int error, is_sx_downgraded, is_sx_locked, op; 2858145256Sjkoshy struct pmc_syscall_args *c; 2859145256Sjkoshy void *arg; 2860145256Sjkoshy 2861145256Sjkoshy PMC_GET_SX_XLOCK(ENOSYS); 2862145256Sjkoshy 2863147191Sjkoshy DROP_GIANT(); 2864147191Sjkoshy 2865145256Sjkoshy is_sx_downgraded = 0; 2866195005Sattilio is_sx_locked = 1; 2867145256Sjkoshy 2868145256Sjkoshy c = (struct pmc_syscall_args *) syscall_args; 2869145256Sjkoshy 2870145256Sjkoshy op = c->pmop_code; 2871145256Sjkoshy arg = c->pmop_data; 2872145256Sjkoshy 2873145256Sjkoshy PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2874145256Sjkoshy pmc_op_to_name[op], arg); 2875145256Sjkoshy 2876145256Sjkoshy error = 0; 2877145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2878145256Sjkoshy 2879145256Sjkoshy switch(op) 2880145256Sjkoshy { 2881145256Sjkoshy 2882145256Sjkoshy 2883145256Sjkoshy /* 2884145256Sjkoshy * Configure a log file. 2885145256Sjkoshy * 2886145256Sjkoshy * XXX This OP will be reworked. 2887145256Sjkoshy */ 2888145256Sjkoshy 2889145256Sjkoshy case PMC_OP_CONFIGURELOG: 2890145256Sjkoshy { 2891157144Sjkoshy struct proc *p; 2892156466Sjkoshy struct pmc *pm; 2893145256Sjkoshy struct pmc_owner *po; 2894145256Sjkoshy struct pmc_op_configurelog cl; 2895145256Sjkoshy 2896145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2897145256Sjkoshy 2898145256Sjkoshy if ((error = copyin(arg, &cl, sizeof(cl))) != 0) 2899145256Sjkoshy break; 2900145256Sjkoshy 2901145256Sjkoshy /* mark this process as owning a log file */ 2902145256Sjkoshy p = td->td_proc; 2903145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2904147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2905147191Sjkoshy error = ENOMEM; 2906147191Sjkoshy break; 2907147191Sjkoshy } 2908145256Sjkoshy 2909147191Sjkoshy /* 2910147191Sjkoshy * If a valid fd was passed in, try to configure that, 2911147191Sjkoshy * otherwise if 'fd' was less than zero and there was 2912147191Sjkoshy * a log file configured, flush its buffers and 2913147191Sjkoshy * de-configure it. 2914147191Sjkoshy */ 2915195005Sattilio if (cl.pm_logfd >= 0) { 2916195005Sattilio sx_xunlock(&pmc_sx); 2917195005Sattilio is_sx_locked = 0; 2918185363Sjkoshy error = pmclog_configure_log(md, po, cl.pm_logfd); 2919195005Sattilio } else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2920147191Sjkoshy pmclog_process_closelog(po); 2921226514Sfabient error = pmclog_close(po); 2922156466Sjkoshy if (error == 0) { 2923156466Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2924156834Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 2925156834Sjkoshy pm->pm_state == PMC_STATE_RUNNING) 2926156466Sjkoshy pmc_stop(pm); 2927147191Sjkoshy error = pmclog_deconfigure_log(po); 2928156466Sjkoshy } 2929147191Sjkoshy } else 2930147191Sjkoshy error = EINVAL; 2931157144Sjkoshy 2932157144Sjkoshy if (error) 2933157144Sjkoshy break; 2934147191Sjkoshy } 2935147191Sjkoshy break; 2936147191Sjkoshy 2937147191Sjkoshy /* 2938147191Sjkoshy * Flush a log file. 2939147191Sjkoshy */ 2940147191Sjkoshy 2941147191Sjkoshy case PMC_OP_FLUSHLOG: 2942147191Sjkoshy { 2943147191Sjkoshy struct pmc_owner *po; 2944147191Sjkoshy 2945147191Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2946147191Sjkoshy 2947147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2948147191Sjkoshy error = EINVAL; 2949145256Sjkoshy break; 2950147191Sjkoshy } 2951145256Sjkoshy 2952147191Sjkoshy error = pmclog_flush(po); 2953145256Sjkoshy } 2954145256Sjkoshy break; 2955145256Sjkoshy 2956145256Sjkoshy /* 2957226514Sfabient * Close a log file. 2958226514Sfabient */ 2959226514Sfabient 2960226514Sfabient case PMC_OP_CLOSELOG: 2961226514Sfabient { 2962226514Sfabient struct pmc_owner *po; 2963226514Sfabient 2964226514Sfabient sx_assert(&pmc_sx, SX_XLOCKED); 2965226514Sfabient 2966226514Sfabient if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2967226514Sfabient error = EINVAL; 2968226514Sfabient break; 2969226514Sfabient } 2970226514Sfabient 2971226514Sfabient error = pmclog_close(po); 2972226514Sfabient } 2973226514Sfabient break; 2974226514Sfabient 2975226514Sfabient /* 2976145256Sjkoshy * Retrieve hardware configuration. 2977145256Sjkoshy */ 2978145256Sjkoshy 2979145256Sjkoshy case PMC_OP_GETCPUINFO: /* CPU information */ 2980145256Sjkoshy { 2981145256Sjkoshy struct pmc_op_getcpuinfo gci; 2982184802Sjkoshy struct pmc_classinfo *pci; 2983184802Sjkoshy struct pmc_classdep *pcd; 2984184802Sjkoshy int cl; 2985145256Sjkoshy 2986145256Sjkoshy gci.pm_cputype = md->pmd_cputype; 2987183266Sjkoshy gci.pm_ncpu = pmc_cpu_max(); 2988145256Sjkoshy gci.pm_npmc = md->pmd_npmc; 2989145256Sjkoshy gci.pm_nclass = md->pmd_nclass; 2990184802Sjkoshy pci = gci.pm_classes; 2991184802Sjkoshy pcd = md->pmd_classdep; 2992184802Sjkoshy for (cl = 0; cl < md->pmd_nclass; cl++, pci++, pcd++) { 2993184802Sjkoshy pci->pm_caps = pcd->pcd_caps; 2994184802Sjkoshy pci->pm_class = pcd->pcd_class; 2995184802Sjkoshy pci->pm_width = pcd->pcd_width; 2996184802Sjkoshy pci->pm_num = pcd->pcd_num; 2997184802Sjkoshy } 2998145256Sjkoshy error = copyout(&gci, arg, sizeof(gci)); 2999145256Sjkoshy } 3000145256Sjkoshy break; 3001145256Sjkoshy 3002233628Sfabient /* 3003233628Sfabient * Retrieve soft events list. 3004233628Sfabient */ 3005233628Sfabient case PMC_OP_GETDYNEVENTINFO: 3006233628Sfabient { 3007233628Sfabient enum pmc_class cl; 3008233628Sfabient enum pmc_event ev; 3009233628Sfabient struct pmc_op_getdyneventinfo *gei; 3010233628Sfabient struct pmc_dyn_event_descr dev; 3011233628Sfabient struct pmc_soft *ps; 3012233628Sfabient uint32_t nevent; 3013145256Sjkoshy 3014233628Sfabient sx_assert(&pmc_sx, SX_LOCKED); 3015233628Sfabient 3016233628Sfabient gei = (struct pmc_op_getdyneventinfo *) arg; 3017233628Sfabient 3018233628Sfabient if ((error = copyin(&gei->pm_class, &cl, sizeof(cl))) != 0) 3019233628Sfabient break; 3020233628Sfabient 3021233628Sfabient /* Only SOFT class is dynamic. */ 3022233628Sfabient if (cl != PMC_CLASS_SOFT) { 3023233628Sfabient error = EINVAL; 3024233628Sfabient break; 3025233628Sfabient } 3026233628Sfabient 3027233628Sfabient nevent = 0; 3028233628Sfabient for (ev = PMC_EV_SOFT_FIRST; ev <= PMC_EV_SOFT_LAST; ev++) { 3029233628Sfabient ps = pmc_soft_ev_acquire(ev); 3030233628Sfabient if (ps == NULL) 3031233628Sfabient continue; 3032233628Sfabient bcopy(&ps->ps_ev, &dev, sizeof(dev)); 3033233628Sfabient pmc_soft_ev_release(ps); 3034233628Sfabient 3035233628Sfabient error = copyout(&dev, 3036233628Sfabient &gei->pm_events[nevent], 3037233628Sfabient sizeof(struct pmc_dyn_event_descr)); 3038233628Sfabient if (error != 0) 3039233628Sfabient break; 3040233628Sfabient nevent++; 3041233628Sfabient } 3042233628Sfabient if (error != 0) 3043233628Sfabient break; 3044233628Sfabient 3045233628Sfabient error = copyout(&nevent, &gei->pm_nevent, 3046233628Sfabient sizeof(nevent)); 3047233628Sfabient } 3048233628Sfabient break; 3049233628Sfabient 3050145256Sjkoshy /* 3051145256Sjkoshy * Get module statistics 3052145256Sjkoshy */ 3053145256Sjkoshy 3054145256Sjkoshy case PMC_OP_GETDRIVERSTATS: 3055145256Sjkoshy { 3056145256Sjkoshy struct pmc_op_getdriverstats gms; 3057145256Sjkoshy 3058145256Sjkoshy bcopy(&pmc_stats, &gms, sizeof(gms)); 3059145256Sjkoshy error = copyout(&gms, arg, sizeof(gms)); 3060145256Sjkoshy } 3061145256Sjkoshy break; 3062145256Sjkoshy 3063145256Sjkoshy 3064145256Sjkoshy /* 3065145256Sjkoshy * Retrieve module version number 3066145256Sjkoshy */ 3067145256Sjkoshy 3068145256Sjkoshy case PMC_OP_GETMODULEVERSION: 3069145256Sjkoshy { 3070147191Sjkoshy uint32_t cv, modv; 3071147191Sjkoshy 3072147191Sjkoshy /* retrieve the client's idea of the ABI version */ 3073147191Sjkoshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 3074147191Sjkoshy break; 3075147191Sjkoshy /* don't service clients newer than our driver */ 3076147191Sjkoshy modv = PMC_VERSION; 3077147191Sjkoshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 3078147191Sjkoshy error = EPROGMISMATCH; 3079147191Sjkoshy break; 3080147191Sjkoshy } 3081147191Sjkoshy error = copyout(&modv, arg, sizeof(int)); 3082145256Sjkoshy } 3083145256Sjkoshy break; 3084145256Sjkoshy 3085145256Sjkoshy 3086145256Sjkoshy /* 3087145256Sjkoshy * Retrieve the state of all the PMCs on a given 3088145256Sjkoshy * CPU. 3089145256Sjkoshy */ 3090145256Sjkoshy 3091145256Sjkoshy case PMC_OP_GETPMCINFO: 3092145256Sjkoshy { 3093184802Sjkoshy int ari; 3094184802Sjkoshy struct pmc *pm; 3095184802Sjkoshy size_t pmcinfo_size; 3096145256Sjkoshy uint32_t cpu, n, npmc; 3097184802Sjkoshy struct pmc_owner *po; 3098184802Sjkoshy struct pmc_binding pb; 3099184802Sjkoshy struct pmc_classdep *pcd; 3100145256Sjkoshy struct pmc_info *p, *pmcinfo; 3101145256Sjkoshy struct pmc_op_getpmcinfo *gpi; 3102145256Sjkoshy 3103145256Sjkoshy PMC_DOWNGRADE_SX(); 3104145256Sjkoshy 3105145256Sjkoshy gpi = (struct pmc_op_getpmcinfo *) arg; 3106145256Sjkoshy 3107145256Sjkoshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 3108145256Sjkoshy break; 3109145256Sjkoshy 3110183266Sjkoshy if (cpu >= pmc_cpu_max()) { 3111145256Sjkoshy error = EINVAL; 3112145256Sjkoshy break; 3113145256Sjkoshy } 3114145256Sjkoshy 3115183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3116145256Sjkoshy error = ENXIO; 3117145256Sjkoshy break; 3118145256Sjkoshy } 3119145256Sjkoshy 3120145256Sjkoshy /* switch to CPU 'cpu' */ 3121145256Sjkoshy pmc_save_cpu_binding(&pb); 3122145256Sjkoshy pmc_select_cpu(cpu); 3123145256Sjkoshy 3124145256Sjkoshy npmc = md->pmd_npmc; 3125145256Sjkoshy 3126145256Sjkoshy pmcinfo_size = npmc * sizeof(struct pmc_info); 3127184214Sdes pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK); 3128145256Sjkoshy 3129145256Sjkoshy p = pmcinfo; 3130145256Sjkoshy 3131145256Sjkoshy for (n = 0; n < md->pmd_npmc; n++, p++) { 3132145256Sjkoshy 3133184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &ari); 3134184802Sjkoshy 3135184802Sjkoshy KASSERT(pcd != NULL, 3136184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 3137184802Sjkoshy 3138184802Sjkoshy if ((error = pcd->pcd_describe(cpu, ari, p, &pm)) != 0) 3139145256Sjkoshy break; 3140145256Sjkoshy 3141145256Sjkoshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 3142145256Sjkoshy p->pm_rowdisp = PMC_DISP_STANDALONE; 3143145256Sjkoshy else if (PMC_ROW_DISP_IS_THREAD(n)) 3144145256Sjkoshy p->pm_rowdisp = PMC_DISP_THREAD; 3145145256Sjkoshy else 3146145256Sjkoshy p->pm_rowdisp = PMC_DISP_FREE; 3147145256Sjkoshy 3148145256Sjkoshy p->pm_ownerpid = -1; 3149145256Sjkoshy 3150145256Sjkoshy if (pm == NULL) /* no PMC associated */ 3151145256Sjkoshy continue; 3152145256Sjkoshy 3153145256Sjkoshy po = pm->pm_owner; 3154145256Sjkoshy 3155145256Sjkoshy KASSERT(po->po_owner != NULL, 3156145256Sjkoshy ("[pmc,%d] pmc_owner had a null proc pointer", 3157145256Sjkoshy __LINE__)); 3158145256Sjkoshy 3159145256Sjkoshy p->pm_ownerpid = po->po_owner->p_pid; 3160145774Sjkoshy p->pm_mode = PMC_TO_MODE(pm); 3161145256Sjkoshy p->pm_event = pm->pm_event; 3162145256Sjkoshy p->pm_flags = pm->pm_flags; 3163145256Sjkoshy 3164145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3165145256Sjkoshy p->pm_reloadcount = 3166145256Sjkoshy pm->pm_sc.pm_reloadcount; 3167145256Sjkoshy } 3168145256Sjkoshy 3169145256Sjkoshy pmc_restore_cpu_binding(&pb); 3170145256Sjkoshy 3171145256Sjkoshy /* now copy out the PMC info collected */ 3172145256Sjkoshy if (error == 0) 3173145256Sjkoshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 3174145256Sjkoshy 3175184205Sdes free(pmcinfo, M_PMC); 3176145256Sjkoshy } 3177145256Sjkoshy break; 3178145256Sjkoshy 3179145256Sjkoshy 3180145256Sjkoshy /* 3181145256Sjkoshy * Set the administrative state of a PMC. I.e. whether 3182145256Sjkoshy * the PMC is to be used or not. 3183145256Sjkoshy */ 3184145256Sjkoshy 3185145256Sjkoshy case PMC_OP_PMCADMIN: 3186145256Sjkoshy { 3187145256Sjkoshy int cpu, ri; 3188145256Sjkoshy enum pmc_state request; 3189145256Sjkoshy struct pmc_cpu *pc; 3190145256Sjkoshy struct pmc_hw *phw; 3191145256Sjkoshy struct pmc_op_pmcadmin pma; 3192145256Sjkoshy struct pmc_binding pb; 3193145256Sjkoshy 3194145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3195145256Sjkoshy 3196145256Sjkoshy KASSERT(td == curthread, 3197145256Sjkoshy ("[pmc,%d] td != curthread", __LINE__)); 3198145256Sjkoshy 3199164033Srwatson error = priv_check(td, PRIV_PMC_MANAGE); 3200164033Srwatson if (error) 3201145256Sjkoshy break; 3202145256Sjkoshy 3203145256Sjkoshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 3204145256Sjkoshy break; 3205145256Sjkoshy 3206145256Sjkoshy cpu = pma.pm_cpu; 3207145256Sjkoshy 3208183266Sjkoshy if (cpu < 0 || cpu >= (int) pmc_cpu_max()) { 3209145256Sjkoshy error = EINVAL; 3210145256Sjkoshy break; 3211145256Sjkoshy } 3212145256Sjkoshy 3213183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3214145256Sjkoshy error = ENXIO; 3215145256Sjkoshy break; 3216145256Sjkoshy } 3217145256Sjkoshy 3218145256Sjkoshy request = pma.pm_state; 3219145256Sjkoshy 3220145256Sjkoshy if (request != PMC_STATE_DISABLED && 3221145256Sjkoshy request != PMC_STATE_FREE) { 3222145256Sjkoshy error = EINVAL; 3223145256Sjkoshy break; 3224145256Sjkoshy } 3225145256Sjkoshy 3226145256Sjkoshy ri = pma.pm_pmc; /* pmc id == row index */ 3227145256Sjkoshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 3228145256Sjkoshy error = EINVAL; 3229145256Sjkoshy break; 3230145256Sjkoshy } 3231145256Sjkoshy 3232145256Sjkoshy /* 3233145256Sjkoshy * We can't disable a PMC with a row-index allocated 3234145256Sjkoshy * for process virtual PMCs. 3235145256Sjkoshy */ 3236145256Sjkoshy 3237145256Sjkoshy if (PMC_ROW_DISP_IS_THREAD(ri) && 3238145256Sjkoshy request == PMC_STATE_DISABLED) { 3239145256Sjkoshy error = EBUSY; 3240145256Sjkoshy break; 3241145256Sjkoshy } 3242145256Sjkoshy 3243145256Sjkoshy /* 3244145256Sjkoshy * otherwise, this PMC on this CPU is either free or 3245145256Sjkoshy * in system-wide mode. 3246145256Sjkoshy */ 3247145256Sjkoshy 3248145256Sjkoshy pmc_save_cpu_binding(&pb); 3249145256Sjkoshy pmc_select_cpu(cpu); 3250145256Sjkoshy 3251145256Sjkoshy pc = pmc_pcpu[cpu]; 3252145256Sjkoshy phw = pc->pc_hwpmcs[ri]; 3253145256Sjkoshy 3254145256Sjkoshy /* 3255145256Sjkoshy * XXX do we need some kind of 'forced' disable? 3256145256Sjkoshy */ 3257145256Sjkoshy 3258145256Sjkoshy if (phw->phw_pmc == NULL) { 3259145256Sjkoshy if (request == PMC_STATE_DISABLED && 3260145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 3261145256Sjkoshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 3262145256Sjkoshy PMC_MARK_ROW_STANDALONE(ri); 3263145256Sjkoshy } else if (request == PMC_STATE_FREE && 3264145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 3265145256Sjkoshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 3266145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 3267145256Sjkoshy } 3268145256Sjkoshy /* other cases are a no-op */ 3269145256Sjkoshy } else 3270145256Sjkoshy error = EBUSY; 3271145256Sjkoshy 3272145256Sjkoshy pmc_restore_cpu_binding(&pb); 3273145256Sjkoshy } 3274145256Sjkoshy break; 3275145256Sjkoshy 3276145256Sjkoshy 3277145256Sjkoshy /* 3278145256Sjkoshy * Allocate a PMC. 3279145256Sjkoshy */ 3280145256Sjkoshy 3281145256Sjkoshy case PMC_OP_PMCALLOCATE: 3282145256Sjkoshy { 3283184802Sjkoshy int adjri, n; 3284184802Sjkoshy u_int cpu; 3285145256Sjkoshy uint32_t caps; 3286184802Sjkoshy struct pmc *pmc; 3287145256Sjkoshy enum pmc_mode mode; 3288145774Sjkoshy struct pmc_hw *phw; 3289184802Sjkoshy struct pmc_binding pb; 3290184802Sjkoshy struct pmc_classdep *pcd; 3291145256Sjkoshy struct pmc_op_pmcallocate pa; 3292145256Sjkoshy 3293145256Sjkoshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 3294145256Sjkoshy break; 3295145256Sjkoshy 3296145256Sjkoshy caps = pa.pm_caps; 3297145256Sjkoshy mode = pa.pm_mode; 3298145256Sjkoshy cpu = pa.pm_cpu; 3299145256Sjkoshy 3300145256Sjkoshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 3301145256Sjkoshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 3302183266Sjkoshy (cpu != (u_int) PMC_CPU_ANY && cpu >= pmc_cpu_max())) { 3303145256Sjkoshy error = EINVAL; 3304145256Sjkoshy break; 3305145256Sjkoshy } 3306145256Sjkoshy 3307145256Sjkoshy /* 3308145256Sjkoshy * Virtual PMCs should only ask for a default CPU. 3309145256Sjkoshy * System mode PMCs need to specify a non-default CPU. 3310145256Sjkoshy */ 3311145256Sjkoshy 3312145256Sjkoshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 3313145256Sjkoshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 3314145256Sjkoshy error = EINVAL; 3315145256Sjkoshy break; 3316145256Sjkoshy } 3317145256Sjkoshy 3318145256Sjkoshy /* 3319183266Sjkoshy * Check that an inactive CPU is not being asked for. 3320145256Sjkoshy */ 3321145256Sjkoshy 3322183266Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && !pmc_cpu_is_active(cpu)) { 3323145256Sjkoshy error = ENXIO; 3324145256Sjkoshy break; 3325145256Sjkoshy } 3326145256Sjkoshy 3327145256Sjkoshy /* 3328145256Sjkoshy * Refuse an allocation for a system-wide PMC if this 3329145256Sjkoshy * process has been jailed, or if this process lacks 3330145256Sjkoshy * super-user credentials and the sysctl tunable 3331145256Sjkoshy * 'security.bsd.unprivileged_syspmcs' is zero. 3332145256Sjkoshy */ 3333145256Sjkoshy 3334145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3335164033Srwatson if (jailed(curthread->td_ucred)) { 3336145256Sjkoshy error = EPERM; 3337164033Srwatson break; 3338164033Srwatson } 3339164033Srwatson if (!pmc_unprivileged_syspmcs) { 3340164033Srwatson error = priv_check(curthread, 3341164033Srwatson PRIV_PMC_SYSTEM); 3342164033Srwatson if (error) 3343164033Srwatson break; 3344164033Srwatson } 3345145256Sjkoshy } 3346145256Sjkoshy 3347145256Sjkoshy /* 3348145256Sjkoshy * Look for valid values for 'pm_flags' 3349145256Sjkoshy */ 3350145256Sjkoshy 3351147191Sjkoshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 3352174395Sjkoshy PMC_F_LOG_PROCEXIT | PMC_F_CALLCHAIN)) != 0) { 3353145256Sjkoshy error = EINVAL; 3354145256Sjkoshy break; 3355145256Sjkoshy } 3356145256Sjkoshy 3357147191Sjkoshy /* process logging options are not allowed for system PMCs */ 3358147191Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 3359147191Sjkoshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 3360147191Sjkoshy error = EINVAL; 3361147191Sjkoshy break; 3362147191Sjkoshy } 3363147191Sjkoshy 3364145256Sjkoshy /* 3365145256Sjkoshy * All sampling mode PMCs need to be able to interrupt the 3366145256Sjkoshy * CPU. 3367145256Sjkoshy */ 3368147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode)) 3369145256Sjkoshy caps |= PMC_CAP_INTERRUPT; 3370145256Sjkoshy 3371149374Sjkoshy /* A valid class specifier should have been passed in. */ 3372149374Sjkoshy for (n = 0; n < md->pmd_nclass; n++) 3373184802Sjkoshy if (md->pmd_classdep[n].pcd_class == pa.pm_class) 3374149374Sjkoshy break; 3375149374Sjkoshy if (n == md->pmd_nclass) { 3376149374Sjkoshy error = EINVAL; 3377149374Sjkoshy break; 3378149374Sjkoshy } 3379149374Sjkoshy 3380149374Sjkoshy /* The requested PMC capabilities should be feasible. */ 3381184802Sjkoshy if ((md->pmd_classdep[n].pcd_caps & caps) != caps) { 3382149374Sjkoshy error = EOPNOTSUPP; 3383149374Sjkoshy break; 3384149374Sjkoshy } 3385149374Sjkoshy 3386145256Sjkoshy PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 3387145256Sjkoshy pa.pm_ev, caps, mode, cpu); 3388145256Sjkoshy 3389145256Sjkoshy pmc = pmc_allocate_pmc_descriptor(); 3390145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 3391145774Sjkoshy PMC_ID_INVALID); 3392145256Sjkoshy pmc->pm_event = pa.pm_ev; 3393145256Sjkoshy pmc->pm_state = PMC_STATE_FREE; 3394145256Sjkoshy pmc->pm_caps = caps; 3395145256Sjkoshy pmc->pm_flags = pa.pm_flags; 3396145256Sjkoshy 3397145256Sjkoshy /* switch thread to CPU 'cpu' */ 3398145256Sjkoshy pmc_save_cpu_binding(&pb); 3399145256Sjkoshy 3400145256Sjkoshy#define PMC_IS_SHAREABLE_PMC(cpu, n) \ 3401145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 3402145256Sjkoshy PMC_PHW_FLAG_IS_SHAREABLE) 3403145256Sjkoshy#define PMC_IS_UNALLOCATED(cpu, n) \ 3404145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 3405145256Sjkoshy 3406145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3407145256Sjkoshy pmc_select_cpu(cpu); 3408184802Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3409184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3410145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3411145256Sjkoshy pmc_can_allocate_rowindex( 3412145774Sjkoshy curthread->td_proc, n, cpu) == 0 && 3413145256Sjkoshy (PMC_IS_UNALLOCATED(cpu, n) || 3414145256Sjkoshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 3415184802Sjkoshy pcd->pcd_allocate_pmc(cpu, adjri, pmc, 3416145256Sjkoshy &pa) == 0) 3417145256Sjkoshy break; 3418184802Sjkoshy } 3419145256Sjkoshy } else { 3420145256Sjkoshy /* Process virtual mode */ 3421145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3422184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3423145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3424145256Sjkoshy pmc_can_allocate_rowindex( 3425145774Sjkoshy curthread->td_proc, n, 3426145774Sjkoshy PMC_CPU_ANY) == 0 && 3427184802Sjkoshy pcd->pcd_allocate_pmc(curthread->td_oncpu, 3428184802Sjkoshy adjri, pmc, &pa) == 0) 3429145256Sjkoshy break; 3430145256Sjkoshy } 3431145256Sjkoshy } 3432145256Sjkoshy 3433145256Sjkoshy#undef PMC_IS_UNALLOCATED 3434145256Sjkoshy#undef PMC_IS_SHAREABLE_PMC 3435145256Sjkoshy 3436145256Sjkoshy pmc_restore_cpu_binding(&pb); 3437145256Sjkoshy 3438145256Sjkoshy if (n == (int) md->pmd_npmc) { 3439145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3440184205Sdes free(pmc, M_PMC); 3441145256Sjkoshy pmc = NULL; 3442145256Sjkoshy error = EINVAL; 3443145256Sjkoshy break; 3444145256Sjkoshy } 3445145256Sjkoshy 3446145774Sjkoshy /* Fill in the correct value in the ID field */ 3447145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 3448145256Sjkoshy 3449145774Sjkoshy PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 3450145774Sjkoshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 3451145774Sjkoshy 3452147191Sjkoshy /* Process mode PMCs with logging enabled need log files */ 3453147191Sjkoshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 3454147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3455147191Sjkoshy 3456147191Sjkoshy /* All system mode sampling PMCs require a log file */ 3457147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 3458147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3459147191Sjkoshy 3460145256Sjkoshy /* 3461145256Sjkoshy * Configure global pmc's immediately 3462145256Sjkoshy */ 3463145256Sjkoshy 3464145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 3465145774Sjkoshy 3466145774Sjkoshy pmc_save_cpu_binding(&pb); 3467145774Sjkoshy pmc_select_cpu(cpu); 3468145774Sjkoshy 3469145774Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 3470184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3471145774Sjkoshy 3472145774Sjkoshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 3473184802Sjkoshy (error = pcd->pcd_config_pmc(cpu, adjri, pmc)) != 0) { 3474184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pmc); 3475145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3476184205Sdes free(pmc, M_PMC); 3477145256Sjkoshy pmc = NULL; 3478145774Sjkoshy pmc_restore_cpu_binding(&pb); 3479145774Sjkoshy error = EPERM; 3480145256Sjkoshy break; 3481145256Sjkoshy } 3482145256Sjkoshy 3483145774Sjkoshy pmc_restore_cpu_binding(&pb); 3484145774Sjkoshy } 3485145256Sjkoshy 3486145256Sjkoshy pmc->pm_state = PMC_STATE_ALLOCATED; 3487145256Sjkoshy 3488145256Sjkoshy /* 3489145256Sjkoshy * mark row disposition 3490145256Sjkoshy */ 3491145256Sjkoshy 3492145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 3493145256Sjkoshy PMC_MARK_ROW_STANDALONE(n); 3494145256Sjkoshy else 3495145256Sjkoshy PMC_MARK_ROW_THREAD(n); 3496145256Sjkoshy 3497145256Sjkoshy /* 3498145256Sjkoshy * Register this PMC with the current thread as its owner. 3499145256Sjkoshy */ 3500145256Sjkoshy 3501145256Sjkoshy if ((error = 3502145256Sjkoshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 3503145256Sjkoshy pmc_release_pmc_descriptor(pmc); 3504184205Sdes free(pmc, M_PMC); 3505145256Sjkoshy pmc = NULL; 3506145256Sjkoshy break; 3507145256Sjkoshy } 3508145256Sjkoshy 3509145256Sjkoshy /* 3510145256Sjkoshy * Return the allocated index. 3511145256Sjkoshy */ 3512145256Sjkoshy 3513145774Sjkoshy pa.pm_pmcid = pmc->pm_id; 3514145256Sjkoshy 3515145256Sjkoshy error = copyout(&pa, arg, sizeof(pa)); 3516145256Sjkoshy } 3517145256Sjkoshy break; 3518145256Sjkoshy 3519145256Sjkoshy 3520145256Sjkoshy /* 3521145256Sjkoshy * Attach a PMC to a process. 3522145256Sjkoshy */ 3523145256Sjkoshy 3524145256Sjkoshy case PMC_OP_PMCATTACH: 3525145256Sjkoshy { 3526145256Sjkoshy struct pmc *pm; 3527145256Sjkoshy struct proc *p; 3528145256Sjkoshy struct pmc_op_pmcattach a; 3529145256Sjkoshy 3530145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3531145256Sjkoshy 3532145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3533145256Sjkoshy break; 3534145256Sjkoshy 3535145256Sjkoshy if (a.pm_pid < 0) { 3536145256Sjkoshy error = EINVAL; 3537145256Sjkoshy break; 3538145256Sjkoshy } else if (a.pm_pid == 0) 3539145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3540145256Sjkoshy 3541145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3542145256Sjkoshy break; 3543145256Sjkoshy 3544145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 3545145256Sjkoshy error = EINVAL; 3546145256Sjkoshy break; 3547145256Sjkoshy } 3548145256Sjkoshy 3549145256Sjkoshy /* PMCs may be (re)attached only when allocated or stopped */ 3550145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3551145256Sjkoshy error = EBUSY; 3552145256Sjkoshy break; 3553145256Sjkoshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 3554145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED) { 3555145256Sjkoshy error = EINVAL; 3556145256Sjkoshy break; 3557145256Sjkoshy } 3558145256Sjkoshy 3559145256Sjkoshy /* lookup pid */ 3560145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3561145256Sjkoshy error = ESRCH; 3562145256Sjkoshy break; 3563145256Sjkoshy } 3564145256Sjkoshy 3565145256Sjkoshy /* 3566145256Sjkoshy * Ignore processes that are working on exiting. 3567145256Sjkoshy */ 3568145256Sjkoshy if (p->p_flag & P_WEXIT) { 3569145256Sjkoshy error = ESRCH; 3570145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3571145256Sjkoshy break; 3572145256Sjkoshy } 3573145256Sjkoshy 3574145256Sjkoshy /* 3575145256Sjkoshy * we are allowed to attach a PMC to a process if 3576145256Sjkoshy * we can debug it. 3577145256Sjkoshy */ 3578145256Sjkoshy error = p_candebug(curthread, p); 3579145256Sjkoshy 3580145256Sjkoshy PROC_UNLOCK(p); 3581145256Sjkoshy 3582145256Sjkoshy if (error == 0) 3583145256Sjkoshy error = pmc_attach_process(p, pm); 3584145256Sjkoshy } 3585145256Sjkoshy break; 3586145256Sjkoshy 3587145256Sjkoshy 3588145256Sjkoshy /* 3589145256Sjkoshy * Detach an attached PMC from a process. 3590145256Sjkoshy */ 3591145256Sjkoshy 3592145256Sjkoshy case PMC_OP_PMCDETACH: 3593145256Sjkoshy { 3594145256Sjkoshy struct pmc *pm; 3595145256Sjkoshy struct proc *p; 3596145256Sjkoshy struct pmc_op_pmcattach a; 3597145256Sjkoshy 3598145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3599145256Sjkoshy break; 3600145256Sjkoshy 3601145256Sjkoshy if (a.pm_pid < 0) { 3602145256Sjkoshy error = EINVAL; 3603145256Sjkoshy break; 3604145256Sjkoshy } else if (a.pm_pid == 0) 3605145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3606145256Sjkoshy 3607145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3608145256Sjkoshy break; 3609145256Sjkoshy 3610145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3611145256Sjkoshy error = ESRCH; 3612145256Sjkoshy break; 3613145256Sjkoshy } 3614145256Sjkoshy 3615145256Sjkoshy /* 3616145256Sjkoshy * Treat processes that are in the process of exiting 3617145256Sjkoshy * as if they were not present. 3618145256Sjkoshy */ 3619145256Sjkoshy 3620145256Sjkoshy if (p->p_flag & P_WEXIT) 3621145256Sjkoshy error = ESRCH; 3622145256Sjkoshy 3623145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3624145256Sjkoshy 3625145256Sjkoshy if (error == 0) 3626145256Sjkoshy error = pmc_detach_process(p, pm); 3627145256Sjkoshy } 3628145256Sjkoshy break; 3629145256Sjkoshy 3630145256Sjkoshy 3631145256Sjkoshy /* 3632147191Sjkoshy * Retrieve the MSR number associated with the counter 3633147191Sjkoshy * 'pmc_id'. This allows processes to directly use RDPMC 3634147191Sjkoshy * instructions to read their PMCs, without the overhead of a 3635147191Sjkoshy * system call. 3636147191Sjkoshy */ 3637147191Sjkoshy 3638147191Sjkoshy case PMC_OP_PMCGETMSR: 3639147191Sjkoshy { 3640184802Sjkoshy int adjri, ri; 3641184802Sjkoshy struct pmc *pm; 3642147191Sjkoshy struct pmc_target *pt; 3643147191Sjkoshy struct pmc_op_getmsr gm; 3644184802Sjkoshy struct pmc_classdep *pcd; 3645147191Sjkoshy 3646147191Sjkoshy PMC_DOWNGRADE_SX(); 3647147191Sjkoshy 3648147191Sjkoshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3649147191Sjkoshy break; 3650147191Sjkoshy 3651147191Sjkoshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3652147191Sjkoshy break; 3653147191Sjkoshy 3654147191Sjkoshy /* 3655147191Sjkoshy * The allocated PMC has to be a process virtual PMC, 3656147191Sjkoshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3657147191Sjkoshy * read using the PMCREAD operation since they may be 3658147191Sjkoshy * allocated on a different CPU than the one we could 3659147191Sjkoshy * be running on at the time of the RDPMC instruction. 3660147191Sjkoshy * 3661147191Sjkoshy * The GETMSR operation is not allowed for PMCs that 3662147191Sjkoshy * are inherited across processes. 3663147191Sjkoshy */ 3664147191Sjkoshy 3665147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3666147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3667147191Sjkoshy error = EINVAL; 3668147191Sjkoshy break; 3669147191Sjkoshy } 3670147191Sjkoshy 3671147191Sjkoshy /* 3672147191Sjkoshy * It only makes sense to use a RDPMC (or its 3673147191Sjkoshy * equivalent instruction on non-x86 architectures) on 3674147191Sjkoshy * a process that has allocated and attached a PMC to 3675147191Sjkoshy * itself. Conversely the PMC is only allowed to have 3676147191Sjkoshy * one process attached to it -- its owner. 3677147191Sjkoshy */ 3678147191Sjkoshy 3679147191Sjkoshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3680147191Sjkoshy LIST_NEXT(pt, pt_next) != NULL || 3681147191Sjkoshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3682147191Sjkoshy error = EINVAL; 3683147191Sjkoshy break; 3684147191Sjkoshy } 3685147191Sjkoshy 3686147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3687184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3688147191Sjkoshy 3689184802Sjkoshy /* PMC class has no 'GETMSR' support */ 3690184802Sjkoshy if (pcd->pcd_get_msr == NULL) { 3691184802Sjkoshy error = ENOSYS; 3692147191Sjkoshy break; 3693184802Sjkoshy } 3694147191Sjkoshy 3695184802Sjkoshy if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) < 0) 3696184802Sjkoshy break; 3697184802Sjkoshy 3698147191Sjkoshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3699147191Sjkoshy break; 3700147191Sjkoshy 3701147191Sjkoshy /* 3702147191Sjkoshy * Mark our process as using MSRs. Update machine 3703147191Sjkoshy * state using a forced context switch. 3704147191Sjkoshy */ 3705147191Sjkoshy 3706147191Sjkoshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3707147191Sjkoshy pmc_force_context_switch(); 3708147191Sjkoshy 3709147191Sjkoshy } 3710147191Sjkoshy break; 3711147191Sjkoshy 3712147191Sjkoshy /* 3713145256Sjkoshy * Release an allocated PMC 3714145256Sjkoshy */ 3715145256Sjkoshy 3716145256Sjkoshy case PMC_OP_PMCRELEASE: 3717145256Sjkoshy { 3718145256Sjkoshy pmc_id_t pmcid; 3719145256Sjkoshy struct pmc *pm; 3720145256Sjkoshy struct pmc_owner *po; 3721145256Sjkoshy struct pmc_op_simple sp; 3722145256Sjkoshy 3723145256Sjkoshy /* 3724145256Sjkoshy * Find PMC pointer for the named PMC. 3725145256Sjkoshy * 3726145256Sjkoshy * Use pmc_release_pmc_descriptor() to switch off the 3727145256Sjkoshy * PMC, remove all its target threads, and remove the 3728145256Sjkoshy * PMC from its owner's list. 3729145256Sjkoshy * 3730145256Sjkoshy * Remove the owner record if this is the last PMC 3731145256Sjkoshy * owned. 3732145256Sjkoshy * 3733145256Sjkoshy * Free up space. 3734145256Sjkoshy */ 3735145256Sjkoshy 3736145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3737145256Sjkoshy break; 3738145256Sjkoshy 3739145256Sjkoshy pmcid = sp.pm_pmcid; 3740145256Sjkoshy 3741145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3742145256Sjkoshy break; 3743145256Sjkoshy 3744145256Sjkoshy po = pm->pm_owner; 3745145256Sjkoshy pmc_release_pmc_descriptor(pm); 3746145256Sjkoshy pmc_maybe_remove_owner(po); 3747145256Sjkoshy 3748184205Sdes free(pm, M_PMC); 3749145256Sjkoshy } 3750145256Sjkoshy break; 3751145256Sjkoshy 3752145256Sjkoshy 3753145256Sjkoshy /* 3754145256Sjkoshy * Read and/or write a PMC. 3755145256Sjkoshy */ 3756145256Sjkoshy 3757145256Sjkoshy case PMC_OP_PMCRW: 3758145256Sjkoshy { 3759184802Sjkoshy int adjri; 3760184802Sjkoshy struct pmc *pm; 3761145256Sjkoshy uint32_t cpu, ri; 3762184802Sjkoshy pmc_value_t oldvalue; 3763184802Sjkoshy struct pmc_binding pb; 3764184802Sjkoshy struct pmc_op_pmcrw prw; 3765184802Sjkoshy struct pmc_classdep *pcd; 3766145256Sjkoshy struct pmc_op_pmcrw *pprw; 3767145256Sjkoshy 3768145256Sjkoshy PMC_DOWNGRADE_SX(); 3769145256Sjkoshy 3770145256Sjkoshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3771145256Sjkoshy break; 3772145256Sjkoshy 3773145301Simp ri = 0; 3774145256Sjkoshy PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3775145256Sjkoshy prw.pm_flags); 3776145256Sjkoshy 3777145256Sjkoshy /* must have at least one flag set */ 3778145256Sjkoshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3779145256Sjkoshy error = EINVAL; 3780145256Sjkoshy break; 3781145256Sjkoshy } 3782145256Sjkoshy 3783145256Sjkoshy /* locate pmc descriptor */ 3784145256Sjkoshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3785145256Sjkoshy break; 3786145256Sjkoshy 3787145256Sjkoshy /* Can't read a PMC that hasn't been started. */ 3788145256Sjkoshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3789145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED && 3790145256Sjkoshy pm->pm_state != PMC_STATE_RUNNING) { 3791145256Sjkoshy error = EINVAL; 3792145256Sjkoshy break; 3793145256Sjkoshy } 3794145256Sjkoshy 3795145256Sjkoshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3796145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3797145256Sjkoshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3798145256Sjkoshy error = EBUSY; 3799145256Sjkoshy break; 3800145256Sjkoshy } 3801145256Sjkoshy 3802145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3803145256Sjkoshy 3804145774Sjkoshy /* 3805145774Sjkoshy * If this PMC is attached to its owner (i.e., 3806145774Sjkoshy * the process requesting this operation) and 3807145774Sjkoshy * is running, then attempt to get an 3808145774Sjkoshy * upto-date reading from hardware for a READ. 3809145774Sjkoshy * Writes are only allowed when the PMC is 3810145774Sjkoshy * stopped, so only update the saved value 3811145774Sjkoshy * field. 3812145774Sjkoshy * 3813145774Sjkoshy * If the PMC is not running, or is not 3814145774Sjkoshy * attached to its owner, read/write to the 3815145774Sjkoshy * savedvalue field. 3816145774Sjkoshy */ 3817145774Sjkoshy 3818145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3819184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3820145774Sjkoshy 3821145256Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3822145774Sjkoshy cpu = curthread->td_oncpu; 3823145774Sjkoshy 3824145774Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3825145774Sjkoshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3826145774Sjkoshy (pm->pm_state == PMC_STATE_RUNNING)) 3827184802Sjkoshy error = (*pcd->pcd_read_pmc)(cpu, adjri, 3828145774Sjkoshy &oldvalue); 3829145774Sjkoshy else 3830145774Sjkoshy oldvalue = pm->pm_gv.pm_savedvalue; 3831145774Sjkoshy } 3832145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3833145256Sjkoshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3834145774Sjkoshy 3835145256Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3836145256Sjkoshy 3837145256Sjkoshy } else { /* System mode PMCs */ 3838145774Sjkoshy cpu = PMC_TO_CPU(pm); 3839145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3840184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3841145256Sjkoshy 3842183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3843145256Sjkoshy error = ENXIO; 3844145256Sjkoshy break; 3845145256Sjkoshy } 3846145256Sjkoshy 3847145256Sjkoshy /* move this thread to CPU 'cpu' */ 3848145256Sjkoshy pmc_save_cpu_binding(&pb); 3849145256Sjkoshy pmc_select_cpu(cpu); 3850145256Sjkoshy 3851145774Sjkoshy critical_enter(); 3852145256Sjkoshy /* save old value */ 3853145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3854184802Sjkoshy if ((error = (*pcd->pcd_read_pmc)(cpu, adjri, 3855145256Sjkoshy &oldvalue))) 3856145256Sjkoshy goto error; 3857145256Sjkoshy /* write out new value */ 3858145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3859184802Sjkoshy error = (*pcd->pcd_write_pmc)(cpu, adjri, 3860145256Sjkoshy prw.pm_value); 3861145256Sjkoshy error: 3862145774Sjkoshy critical_exit(); 3863145256Sjkoshy pmc_restore_cpu_binding(&pb); 3864145256Sjkoshy if (error) 3865145256Sjkoshy break; 3866145256Sjkoshy } 3867145256Sjkoshy 3868145256Sjkoshy pprw = (struct pmc_op_pmcrw *) arg; 3869145256Sjkoshy 3870153110Sru#ifdef DEBUG 3871145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3872145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3873145256Sjkoshy ri, prw.pm_value, oldvalue); 3874156778Sjkoshy else if (prw.pm_flags & PMC_F_OLDVALUE) 3875145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3876145256Sjkoshy#endif 3877145256Sjkoshy 3878145256Sjkoshy /* return old value if requested */ 3879145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3880145256Sjkoshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3881145256Sjkoshy sizeof(prw.pm_value)))) 3882145256Sjkoshy break; 3883145256Sjkoshy 3884145256Sjkoshy } 3885145256Sjkoshy break; 3886145256Sjkoshy 3887145256Sjkoshy 3888145256Sjkoshy /* 3889145256Sjkoshy * Set the sampling rate for a sampling mode PMC and the 3890145256Sjkoshy * initial count for a counting mode PMC. 3891145256Sjkoshy */ 3892145256Sjkoshy 3893145256Sjkoshy case PMC_OP_PMCSETCOUNT: 3894145256Sjkoshy { 3895145256Sjkoshy struct pmc *pm; 3896145256Sjkoshy struct pmc_op_pmcsetcount sc; 3897145256Sjkoshy 3898145256Sjkoshy PMC_DOWNGRADE_SX(); 3899145256Sjkoshy 3900145256Sjkoshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3901145256Sjkoshy break; 3902145256Sjkoshy 3903145256Sjkoshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3904145256Sjkoshy break; 3905145256Sjkoshy 3906145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3907145256Sjkoshy error = EBUSY; 3908145256Sjkoshy break; 3909145256Sjkoshy } 3910145256Sjkoshy 3911145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3912145256Sjkoshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3913145256Sjkoshy else 3914145256Sjkoshy pm->pm_sc.pm_initial = sc.pm_count; 3915145256Sjkoshy } 3916145256Sjkoshy break; 3917145256Sjkoshy 3918145256Sjkoshy 3919145256Sjkoshy /* 3920145256Sjkoshy * Start a PMC. 3921145256Sjkoshy */ 3922145256Sjkoshy 3923145256Sjkoshy case PMC_OP_PMCSTART: 3924145256Sjkoshy { 3925145256Sjkoshy pmc_id_t pmcid; 3926145256Sjkoshy struct pmc *pm; 3927145256Sjkoshy struct pmc_op_simple sp; 3928145256Sjkoshy 3929145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3930145256Sjkoshy 3931145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3932145256Sjkoshy break; 3933145256Sjkoshy 3934145256Sjkoshy pmcid = sp.pm_pmcid; 3935145256Sjkoshy 3936145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3937145256Sjkoshy break; 3938145256Sjkoshy 3939145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3940145774Sjkoshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3941145774Sjkoshy pm->pm_id, pmcid)); 3942145256Sjkoshy 3943145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3944145256Sjkoshy break; 3945145256Sjkoshy else if (pm->pm_state != PMC_STATE_STOPPED && 3946145256Sjkoshy pm->pm_state != PMC_STATE_ALLOCATED) { 3947145256Sjkoshy error = EINVAL; 3948145256Sjkoshy break; 3949145256Sjkoshy } 3950145256Sjkoshy 3951145256Sjkoshy error = pmc_start(pm); 3952145256Sjkoshy } 3953145256Sjkoshy break; 3954145256Sjkoshy 3955145256Sjkoshy 3956145256Sjkoshy /* 3957145256Sjkoshy * Stop a PMC. 3958145256Sjkoshy */ 3959145256Sjkoshy 3960145256Sjkoshy case PMC_OP_PMCSTOP: 3961145256Sjkoshy { 3962145256Sjkoshy pmc_id_t pmcid; 3963145256Sjkoshy struct pmc *pm; 3964145256Sjkoshy struct pmc_op_simple sp; 3965145256Sjkoshy 3966145256Sjkoshy PMC_DOWNGRADE_SX(); 3967145256Sjkoshy 3968145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3969145256Sjkoshy break; 3970145256Sjkoshy 3971145256Sjkoshy pmcid = sp.pm_pmcid; 3972145256Sjkoshy 3973145256Sjkoshy /* 3974145256Sjkoshy * Mark the PMC as inactive and invoke the MD stop 3975145256Sjkoshy * routines if needed. 3976145256Sjkoshy */ 3977145256Sjkoshy 3978145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3979145256Sjkoshy break; 3980145256Sjkoshy 3981145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3982145774Sjkoshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3983145774Sjkoshy pm->pm_id, pmcid)); 3984145256Sjkoshy 3985145256Sjkoshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3986145256Sjkoshy break; 3987145256Sjkoshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3988145256Sjkoshy error = EINVAL; 3989145256Sjkoshy break; 3990145256Sjkoshy } 3991145256Sjkoshy 3992145256Sjkoshy error = pmc_stop(pm); 3993145256Sjkoshy } 3994145256Sjkoshy break; 3995145256Sjkoshy 3996145256Sjkoshy 3997145256Sjkoshy /* 3998147867Sjkoshy * Write a user supplied value to the log file. 3999145256Sjkoshy */ 4000145256Sjkoshy 4001145256Sjkoshy case PMC_OP_WRITELOG: 4002145256Sjkoshy { 4003147191Sjkoshy struct pmc_op_writelog wl; 4004147191Sjkoshy struct pmc_owner *po; 4005145256Sjkoshy 4006145256Sjkoshy PMC_DOWNGRADE_SX(); 4007145256Sjkoshy 4008147191Sjkoshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 4009145256Sjkoshy break; 4010145256Sjkoshy 4011147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 4012145256Sjkoshy error = EINVAL; 4013145256Sjkoshy break; 4014145256Sjkoshy } 4015145256Sjkoshy 4016147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 4017145774Sjkoshy error = EINVAL; 4018145774Sjkoshy break; 4019145774Sjkoshy } 4020145774Sjkoshy 4021147191Sjkoshy error = pmclog_process_userlog(po, &wl); 4022145256Sjkoshy } 4023145256Sjkoshy break; 4024145256Sjkoshy 4025147191Sjkoshy 4026145256Sjkoshy default: 4027145256Sjkoshy error = EINVAL; 4028145256Sjkoshy break; 4029145256Sjkoshy } 4030145256Sjkoshy 4031195005Sattilio if (is_sx_locked != 0) { 4032195005Sattilio if (is_sx_downgraded) 4033195005Sattilio sx_sunlock(&pmc_sx); 4034195005Sattilio else 4035195005Sattilio sx_xunlock(&pmc_sx); 4036195005Sattilio } 4037145256Sjkoshy 4038145256Sjkoshy if (error) 4039145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 4040145256Sjkoshy 4041147191Sjkoshy PICKUP_GIANT(); 4042147191Sjkoshy 4043145256Sjkoshy return error; 4044145256Sjkoshy} 4045145256Sjkoshy 4046145256Sjkoshy/* 4047145256Sjkoshy * Helper functions 4048145256Sjkoshy */ 4049145256Sjkoshy 4050147191Sjkoshy 4051145256Sjkoshy/* 4052174395Sjkoshy * Mark the thread as needing callchain capture and post an AST. The 4053174395Sjkoshy * actual callchain capture will be done in a context where it is safe 4054174395Sjkoshy * to take page faults. 4055174395Sjkoshy */ 4056174395Sjkoshy 4057174395Sjkoshystatic void 4058186037Sjkoshypmc_post_callchain_callback(void) 4059174395Sjkoshy{ 4060174395Sjkoshy struct thread *td; 4061174395Sjkoshy 4062174395Sjkoshy td = curthread; 4063174395Sjkoshy 4064205998Sfabient /* 4065205998Sfabient * If there is multiple PMCs for the same interrupt ignore new post 4066205998Sfabient */ 4067205998Sfabient if (td->td_pflags & TDP_CALLCHAIN) 4068205998Sfabient return; 4069186037Sjkoshy 4070174395Sjkoshy /* 4071186037Sjkoshy * Mark this thread as needing callchain capture. 4072186037Sjkoshy * `td->td_pflags' will be safe to touch because this thread 4073186037Sjkoshy * was in user space when it was interrupted. 4074174395Sjkoshy */ 4075174395Sjkoshy td->td_pflags |= TDP_CALLCHAIN; 4076174395Sjkoshy 4077174395Sjkoshy /* 4078186037Sjkoshy * Don't let this thread migrate between CPUs until callchain 4079186037Sjkoshy * capture completes. 4080174395Sjkoshy */ 4081186037Sjkoshy sched_pin(); 4082174395Sjkoshy 4083174395Sjkoshy return; 4084174395Sjkoshy} 4085174395Sjkoshy 4086174395Sjkoshy/* 4087147191Sjkoshy * Interrupt processing. 4088147191Sjkoshy * 4089174395Sjkoshy * Find a free slot in the per-cpu array of samples and capture the 4090174395Sjkoshy * current callchain there. If a sample was successfully added, a bit 4091174395Sjkoshy * is set in mask 'pmc_cpumask' denoting that the DO_SAMPLES hook 4092174395Sjkoshy * needs to be invoked from the clock handler. 4093147191Sjkoshy * 4094147191Sjkoshy * This function is meant to be called from an NMI handler. It cannot 4095147191Sjkoshy * use any of the locking primitives supplied by the OS. 4096145256Sjkoshy */ 4097145256Sjkoshy 4098147191Sjkoshyint 4099233628Sfabientpmc_process_interrupt(int cpu, int ring, struct pmc *pm, struct trapframe *tf, 4100174395Sjkoshy int inuserspace) 4101145256Sjkoshy{ 4102174395Sjkoshy int error, callchaindepth; 4103147191Sjkoshy struct thread *td; 4104147191Sjkoshy struct pmc_sample *ps; 4105147191Sjkoshy struct pmc_samplebuffer *psb; 4106145256Sjkoshy 4107147191Sjkoshy error = 0; 4108145256Sjkoshy 4109174395Sjkoshy /* 4110174395Sjkoshy * Allocate space for a sample buffer. 4111174395Sjkoshy */ 4112233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4113145256Sjkoshy 4114147191Sjkoshy ps = psb->ps_write; 4115174395Sjkoshy if (ps->ps_nsamples) { /* in use, reader hasn't caught up */ 4116147867Sjkoshy pm->pm_stalled = 1; 4117147191Sjkoshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 4118174395Sjkoshy PMCDBG(SAM,INT,1,"(spc) cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", 4119174395Sjkoshy cpu, pm, (void *) tf, inuserspace, 4120147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4121147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4122147191Sjkoshy error = ENOMEM; 4123147191Sjkoshy goto done; 4124147191Sjkoshy } 4125145256Sjkoshy 4126174395Sjkoshy 4127174395Sjkoshy /* Fill in entry. */ 4128174395Sjkoshy PMCDBG(SAM,INT,1,"cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", cpu, pm, 4129174395Sjkoshy (void *) tf, inuserspace, 4130147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4131147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4132145256Sjkoshy 4133186037Sjkoshy KASSERT(pm->pm_runcount >= 0, 4134186037Sjkoshy ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm, 4135186037Sjkoshy pm->pm_runcount)); 4136186037Sjkoshy 4137208861Sfabient atomic_add_rel_int(&pm->pm_runcount, 1); /* hold onto PMC */ 4138233628Sfabient 4139147191Sjkoshy ps->ps_pmc = pm; 4140147191Sjkoshy if ((td = curthread) && td->td_proc) 4141147191Sjkoshy ps->ps_pid = td->td_proc->p_pid; 4142147191Sjkoshy else 4143147191Sjkoshy ps->ps_pid = -1; 4144174395Sjkoshy ps->ps_cpu = cpu; 4145186037Sjkoshy ps->ps_td = td; 4146174395Sjkoshy ps->ps_flags = inuserspace ? PMC_CC_F_USERSPACE : 0; 4147145256Sjkoshy 4148174395Sjkoshy callchaindepth = (pm->pm_flags & PMC_F_CALLCHAIN) ? 4149174395Sjkoshy pmc_callchaindepth : 1; 4150174395Sjkoshy 4151174395Sjkoshy if (callchaindepth == 1) 4152174395Sjkoshy ps->ps_pc[0] = PMC_TRAPFRAME_TO_PC(tf); 4153174395Sjkoshy else { 4154174395Sjkoshy /* 4155174395Sjkoshy * Kernel stack traversals can be done immediately, 4156174395Sjkoshy * while we defer to an AST for user space traversals. 4157174395Sjkoshy */ 4158233628Sfabient if (!inuserspace) { 4159174395Sjkoshy callchaindepth = 4160174395Sjkoshy pmc_save_kernel_callchain(ps->ps_pc, 4161174395Sjkoshy callchaindepth, tf); 4162233628Sfabient } else { 4163186037Sjkoshy pmc_post_callchain_callback(); 4164174395Sjkoshy callchaindepth = PMC_SAMPLE_INUSE; 4165174395Sjkoshy } 4166174395Sjkoshy } 4167174395Sjkoshy 4168174395Sjkoshy ps->ps_nsamples = callchaindepth; /* mark entry as in use */ 4169174395Sjkoshy 4170147191Sjkoshy /* increment write pointer, modulo ring buffer size */ 4171147191Sjkoshy ps++; 4172147191Sjkoshy if (ps == psb->ps_fence) 4173147191Sjkoshy psb->ps_write = psb->ps_samples; 4174147191Sjkoshy else 4175147191Sjkoshy psb->ps_write = ps; 4176145256Sjkoshy 4177147191Sjkoshy done: 4178147191Sjkoshy /* mark CPU as needing processing */ 4179222813Sattilio CPU_SET_ATOMIC(cpu, &pmc_cpumask); 4180147191Sjkoshy 4181174395Sjkoshy return (error); 4182145256Sjkoshy} 4183145256Sjkoshy 4184174395Sjkoshy/* 4185174395Sjkoshy * Capture a user call chain. This function will be called from ast() 4186174395Sjkoshy * before control returns to userland and before the process gets 4187174395Sjkoshy * rescheduled. 4188174395Sjkoshy */ 4189147191Sjkoshy 4190174395Sjkoshystatic void 4191233628Sfabientpmc_capture_user_callchain(int cpu, int ring, struct trapframe *tf) 4192174395Sjkoshy{ 4193174395Sjkoshy int i; 4194174395Sjkoshy struct pmc *pm; 4195186037Sjkoshy struct thread *td; 4196174395Sjkoshy struct pmc_sample *ps; 4197174395Sjkoshy struct pmc_samplebuffer *psb; 4198186037Sjkoshy#ifdef INVARIANTS 4199186037Sjkoshy int ncallchains; 4200186037Sjkoshy#endif 4201174395Sjkoshy 4202233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4203186037Sjkoshy td = curthread; 4204174395Sjkoshy 4205186037Sjkoshy KASSERT(td->td_pflags & TDP_CALLCHAIN, 4206186037Sjkoshy ("[pmc,%d] Retrieving callchain for thread that doesn't want it", 4207186037Sjkoshy __LINE__)); 4208186037Sjkoshy 4209186037Sjkoshy#ifdef INVARIANTS 4210186037Sjkoshy ncallchains = 0; 4211186037Sjkoshy#endif 4212186037Sjkoshy 4213174395Sjkoshy /* 4214174395Sjkoshy * Iterate through all deferred callchain requests. 4215174395Sjkoshy */ 4216174395Sjkoshy 4217186037Sjkoshy ps = psb->ps_samples; 4218186037Sjkoshy for (i = 0; i < pmc_nsamples; i++, ps++) { 4219174395Sjkoshy 4220174395Sjkoshy if (ps->ps_nsamples != PMC_SAMPLE_INUSE) 4221174395Sjkoshy continue; 4222186037Sjkoshy if (ps->ps_td != td) 4223186037Sjkoshy continue; 4224174395Sjkoshy 4225186037Sjkoshy KASSERT(ps->ps_cpu == cpu, 4226186037Sjkoshy ("[pmc,%d] cpu mismatch ps_cpu=%d pcpu=%d", __LINE__, 4227186037Sjkoshy ps->ps_cpu, PCPU_GET(cpuid))); 4228186037Sjkoshy 4229174395Sjkoshy pm = ps->ps_pmc; 4230174395Sjkoshy 4231174395Sjkoshy KASSERT(pm->pm_flags & PMC_F_CALLCHAIN, 4232174395Sjkoshy ("[pmc,%d] Retrieving callchain for PMC that doesn't " 4233174395Sjkoshy "want it", __LINE__)); 4234174395Sjkoshy 4235186037Sjkoshy KASSERT(pm->pm_runcount > 0, 4236186037Sjkoshy ("[pmc,%d] runcount %d", __LINE__, pm->pm_runcount)); 4237186037Sjkoshy 4238174395Sjkoshy /* 4239174395Sjkoshy * Retrieve the callchain and mark the sample buffer 4240174395Sjkoshy * as 'processable' by the timer tick sweep code. 4241174395Sjkoshy */ 4242174395Sjkoshy ps->ps_nsamples = pmc_save_user_callchain(ps->ps_pc, 4243174395Sjkoshy pmc_callchaindepth, tf); 4244186037Sjkoshy 4245186037Sjkoshy#ifdef INVARIANTS 4246186037Sjkoshy ncallchains++; 4247186037Sjkoshy#endif 4248174395Sjkoshy } 4249174395Sjkoshy 4250186037Sjkoshy KASSERT(ncallchains > 0, 4251186037Sjkoshy ("[pmc,%d] cpu %d didn't find a sample to collect", __LINE__, 4252186037Sjkoshy cpu)); 4253186037Sjkoshy 4254233628Sfabient KASSERT(td->td_pinned > 0, 4255233628Sfabient ("[pmc,%d] invalid td_pinned value", __LINE__)); 4256233628Sfabient sched_unpin(); /* Can migrate safely now. */ 4257233628Sfabient 4258174395Sjkoshy return; 4259174395Sjkoshy} 4260174395Sjkoshy 4261145256Sjkoshy/* 4262147191Sjkoshy * Process saved PC samples. 4263145256Sjkoshy */ 4264145256Sjkoshy 4265145256Sjkoshystatic void 4266233628Sfabientpmc_process_samples(int cpu, int ring) 4267145256Sjkoshy{ 4268147191Sjkoshy struct pmc *pm; 4269185363Sjkoshy int adjri, n; 4270147191Sjkoshy struct thread *td; 4271147191Sjkoshy struct pmc_owner *po; 4272147191Sjkoshy struct pmc_sample *ps; 4273184802Sjkoshy struct pmc_classdep *pcd; 4274147191Sjkoshy struct pmc_samplebuffer *psb; 4275145256Sjkoshy 4276147191Sjkoshy KASSERT(PCPU_GET(cpuid) == cpu, 4277147191Sjkoshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 4278147191Sjkoshy PCPU_GET(cpuid), cpu)); 4279145256Sjkoshy 4280233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4281147191Sjkoshy 4282147191Sjkoshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 4283147191Sjkoshy 4284147191Sjkoshy ps = psb->ps_read; 4285174395Sjkoshy if (ps->ps_nsamples == PMC_SAMPLE_FREE) 4286147191Sjkoshy break; 4287147191Sjkoshy 4288147191Sjkoshy pm = ps->ps_pmc; 4289186037Sjkoshy 4290186037Sjkoshy KASSERT(pm->pm_runcount > 0, 4291186037Sjkoshy ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm, 4292186037Sjkoshy pm->pm_runcount)); 4293186037Sjkoshy 4294147191Sjkoshy po = pm->pm_owner; 4295147191Sjkoshy 4296147191Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 4297147191Sjkoshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 4298147191Sjkoshy pm, PMC_TO_MODE(pm))); 4299147191Sjkoshy 4300147191Sjkoshy /* Ignore PMCs that have been switched off */ 4301147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 4302147191Sjkoshy goto entrydone; 4303147191Sjkoshy 4304233628Sfabient /* If there is a pending AST wait for completion */ 4305233628Sfabient if (ps->ps_nsamples == PMC_SAMPLE_INUSE) { 4306233628Sfabient /* Need a rescan at a later time. */ 4307233628Sfabient CPU_SET_ATOMIC(cpu, &pmc_cpumask); 4308233628Sfabient break; 4309233628Sfabient } 4310233628Sfabient 4311174395Sjkoshy PMCDBG(SAM,OPS,1,"cpu=%d pm=%p n=%d fl=%x wr=%d rd=%d", cpu, 4312174395Sjkoshy pm, ps->ps_nsamples, ps->ps_flags, 4313147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4314147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4315147191Sjkoshy 4316147191Sjkoshy /* 4317147191Sjkoshy * If this is a process-mode PMC that is attached to 4318147191Sjkoshy * its owner, and if the PC is in user mode, update 4319147191Sjkoshy * profiling statistics like timer-based profiling 4320147191Sjkoshy * would have done. 4321147191Sjkoshy */ 4322147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 4323174395Sjkoshy if (ps->ps_flags & PMC_CC_F_USERSPACE) { 4324147191Sjkoshy td = FIRST_THREAD_IN_PROC(po->po_owner); 4325174395Sjkoshy addupc_intr(td, ps->ps_pc[0], 1); 4326147191Sjkoshy } 4327147191Sjkoshy goto entrydone; 4328147191Sjkoshy } 4329147191Sjkoshy 4330147191Sjkoshy /* 4331147191Sjkoshy * Otherwise, this is either a sampling mode PMC that 4332147191Sjkoshy * is attached to a different process than its owner, 4333147191Sjkoshy * or a system-wide sampling PMC. Dispatch a log 4334147191Sjkoshy * entry to the PMC's owner process. 4335147191Sjkoshy */ 4336174395Sjkoshy pmclog_process_callchain(pm, ps); 4337147191Sjkoshy 4338147191Sjkoshy entrydone: 4339233628Sfabient ps->ps_nsamples = 0; /* mark entry as free */ 4340208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount, 1); 4341147191Sjkoshy 4342147191Sjkoshy /* increment read pointer, modulo sample size */ 4343147191Sjkoshy if (++ps == psb->ps_fence) 4344147191Sjkoshy psb->ps_read = psb->ps_samples; 4345147191Sjkoshy else 4346147191Sjkoshy psb->ps_read = ps; 4347147191Sjkoshy } 4348147191Sjkoshy 4349147191Sjkoshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 4350147191Sjkoshy 4351147191Sjkoshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 4352147191Sjkoshy if (n == 0) 4353147191Sjkoshy return; 4354147191Sjkoshy 4355147191Sjkoshy /* 4356147191Sjkoshy * Restart any stalled sampling PMCs on this CPU. 4357147191Sjkoshy * 4358147867Sjkoshy * If the NMI handler sets the pm_stalled field of a PMC after 4359147867Sjkoshy * the check below, we'll end up processing the stalled PMC at 4360147867Sjkoshy * the next hardclock tick. 4361147191Sjkoshy */ 4362147191Sjkoshy for (n = 0; n < md->pmd_npmc; n++) { 4363184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 4364184802Sjkoshy KASSERT(pcd != NULL, 4365184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 4366184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu,adjri,&pm); 4367184802Sjkoshy 4368147191Sjkoshy if (pm == NULL || /* !cfg'ed */ 4369147191Sjkoshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 4370147191Sjkoshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 4371147867Sjkoshy pm->pm_stalled == 0) /* !stalled */ 4372147191Sjkoshy continue; 4373147191Sjkoshy 4374147867Sjkoshy pm->pm_stalled = 0; 4375184802Sjkoshy (*pcd->pcd_start_pmc)(cpu, adjri); 4376147191Sjkoshy } 4377145256Sjkoshy} 4378145256Sjkoshy 4379145256Sjkoshy/* 4380145256Sjkoshy * Event handlers. 4381145256Sjkoshy */ 4382145256Sjkoshy 4383145256Sjkoshy/* 4384145256Sjkoshy * Handle a process exit. 4385145256Sjkoshy * 4386147191Sjkoshy * Remove this process from all hash tables. If this process 4387147191Sjkoshy * owned any PMCs, turn off those PMCs and deallocate them, 4388147191Sjkoshy * removing any associations with target processes. 4389147191Sjkoshy * 4390147191Sjkoshy * This function will be called by the last 'thread' of a 4391147191Sjkoshy * process. 4392147191Sjkoshy * 4393145256Sjkoshy * XXX This eventhandler gets called early in the exit process. 4394145256Sjkoshy * Consider using a 'hook' invocation from thread_exit() or equivalent 4395145256Sjkoshy * spot. Another negative is that kse_exit doesn't seem to call 4396145256Sjkoshy * exit1() [??]. 4397147191Sjkoshy * 4398145256Sjkoshy */ 4399145256Sjkoshy 4400145256Sjkoshystatic void 4401145256Sjkoshypmc_process_exit(void *arg __unused, struct proc *p) 4402145256Sjkoshy{ 4403184802Sjkoshy struct pmc *pm; 4404184802Sjkoshy int adjri, cpu; 4405184802Sjkoshy unsigned int ri; 4406145256Sjkoshy int is_using_hwpmcs; 4407184802Sjkoshy struct pmc_owner *po; 4408147191Sjkoshy struct pmc_process *pp; 4409184802Sjkoshy struct pmc_classdep *pcd; 4410147191Sjkoshy pmc_value_t newvalue, tmp; 4411145256Sjkoshy 4412145256Sjkoshy PROC_LOCK(p); 4413145256Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 4414145256Sjkoshy PROC_UNLOCK(p); 4415145256Sjkoshy 4416147191Sjkoshy /* 4417147191Sjkoshy * Log a sysexit event to all SS PMC owners. 4418147191Sjkoshy */ 4419147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4420147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4421147191Sjkoshy pmclog_process_sysexit(po, p->p_pid); 4422145256Sjkoshy 4423147191Sjkoshy if (!is_using_hwpmcs) 4424147191Sjkoshy return; 4425147191Sjkoshy 4426147191Sjkoshy PMC_GET_SX_XLOCK(); 4427147191Sjkoshy PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 4428147191Sjkoshy p->p_comm); 4429147191Sjkoshy 4430147191Sjkoshy /* 4431147191Sjkoshy * Since this code is invoked by the last thread in an exiting 4432147191Sjkoshy * process, we would have context switched IN at some prior 4433147191Sjkoshy * point. However, with PREEMPTION, kernel mode context 4434147191Sjkoshy * switches may happen any time, so we want to disable a 4435147191Sjkoshy * context switch OUT till we get any PMCs targetting this 4436147191Sjkoshy * process off the hardware. 4437147191Sjkoshy * 4438147191Sjkoshy * We also need to atomically remove this process' 4439147191Sjkoshy * entry from our target process hash table, using 4440147191Sjkoshy * PMC_FLAG_REMOVE. 4441147191Sjkoshy */ 4442147191Sjkoshy PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 4443147191Sjkoshy p->p_comm); 4444147191Sjkoshy 4445147191Sjkoshy critical_enter(); /* no preemption */ 4446147191Sjkoshy 4447147191Sjkoshy cpu = curthread->td_oncpu; 4448147191Sjkoshy 4449147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, 4450147191Sjkoshy PMC_FLAG_REMOVE)) != NULL) { 4451147191Sjkoshy 4452147191Sjkoshy PMCDBG(PRC,EXT,2, 4453147191Sjkoshy "process-exit proc=%p pmc-process=%p", p, pp); 4454147191Sjkoshy 4455147191Sjkoshy /* 4456147191Sjkoshy * The exiting process could the target of 4457147191Sjkoshy * some PMCs which will be running on 4458147191Sjkoshy * currently executing CPU. 4459147191Sjkoshy * 4460147191Sjkoshy * We need to turn these PMCs off like we 4461147191Sjkoshy * would do at context switch OUT time. 4462147191Sjkoshy */ 4463147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 4464147191Sjkoshy 4465147191Sjkoshy /* 4466147191Sjkoshy * Pick up the pmc pointer from hardware 4467147191Sjkoshy * state similar to the CSW_OUT code. 4468147191Sjkoshy */ 4469147191Sjkoshy pm = NULL; 4470147191Sjkoshy 4471184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 4472184802Sjkoshy 4473184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 4474184802Sjkoshy 4475147191Sjkoshy PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 4476147191Sjkoshy 4477147191Sjkoshy if (pm == NULL || 4478147191Sjkoshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 4479147191Sjkoshy continue; 4480147191Sjkoshy 4481147191Sjkoshy PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 4482147191Sjkoshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 4483147191Sjkoshy pm, pm->pm_state); 4484147191Sjkoshy 4485147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 4486147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 4487147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 4488147191Sjkoshy 4489147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 4490147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 4491147191Sjkoshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 4492147191Sjkoshy 4493184802Sjkoshy (void) pcd->pcd_stop_pmc(cpu, adjri); 4494147191Sjkoshy 4495147191Sjkoshy KASSERT(pm->pm_runcount > 0, 4496147191Sjkoshy ("[pmc,%d] bad runcount ri %d rc %d", 4497147191Sjkoshy __LINE__, ri, pm->pm_runcount)); 4498147191Sjkoshy 4499147867Sjkoshy /* Stop hardware only if it is actually running */ 4500147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 4501147867Sjkoshy pm->pm_stalled == 0) { 4502184802Sjkoshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 4503147191Sjkoshy tmp = newvalue - 4504147191Sjkoshy PMC_PCPU_SAVED(cpu,ri); 4505147191Sjkoshy 4506147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 4507147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 4508147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 4509147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 4510147191Sjkoshy } 4511147191Sjkoshy 4512208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount,1); 4513147191Sjkoshy 4514147191Sjkoshy KASSERT((int) pm->pm_runcount >= 0, 4515147191Sjkoshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 4516147191Sjkoshy 4517184802Sjkoshy (void) pcd->pcd_config_pmc(cpu, adjri, NULL); 4518147191Sjkoshy } 4519147191Sjkoshy 4520147191Sjkoshy /* 4521147191Sjkoshy * Inform the MD layer of this pseudo "context switch 4522147191Sjkoshy * out" 4523147191Sjkoshy */ 4524147191Sjkoshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 4525147191Sjkoshy 4526147191Sjkoshy critical_exit(); /* ok to be pre-empted now */ 4527147191Sjkoshy 4528147191Sjkoshy /* 4529147191Sjkoshy * Unlink this process from the PMCs that are 4530147191Sjkoshy * targetting it. This will send a signal to 4531147191Sjkoshy * all PMC owner's whose PMCs are orphaned. 4532147191Sjkoshy * 4533147191Sjkoshy * Log PMC value at exit time if requested. 4534147191Sjkoshy */ 4535147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4536147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 4537147867Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 4538147867Sjkoshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 4539147191Sjkoshy pmclog_process_procexit(pm, pp); 4540147191Sjkoshy pmc_unlink_target_process(pm, pp); 4541147191Sjkoshy } 4542184205Sdes free(pp, M_PMC); 4543147191Sjkoshy 4544147191Sjkoshy } else 4545147191Sjkoshy critical_exit(); /* pp == NULL */ 4546147191Sjkoshy 4547147191Sjkoshy 4548147191Sjkoshy /* 4549147191Sjkoshy * If the process owned PMCs, free them up and free up 4550147191Sjkoshy * memory. 4551147191Sjkoshy */ 4552147191Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 4553147191Sjkoshy pmc_remove_owner(po); 4554147191Sjkoshy pmc_destroy_owner_descriptor(po); 4555145256Sjkoshy } 4556147191Sjkoshy 4557147191Sjkoshy sx_xunlock(&pmc_sx); 4558145256Sjkoshy} 4559145256Sjkoshy 4560145256Sjkoshy/* 4561145256Sjkoshy * Handle a process fork. 4562145256Sjkoshy * 4563145256Sjkoshy * If the parent process 'p1' is under HWPMC monitoring, then copy 4564145256Sjkoshy * over any attached PMCs that have 'do_descendants' semantics. 4565145256Sjkoshy */ 4566145256Sjkoshy 4567145256Sjkoshystatic void 4568147191Sjkoshypmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 4569145256Sjkoshy int flags) 4570145256Sjkoshy{ 4571145256Sjkoshy int is_using_hwpmcs; 4572147191Sjkoshy unsigned int ri; 4573147191Sjkoshy uint32_t do_descendants; 4574147191Sjkoshy struct pmc *pm; 4575147191Sjkoshy struct pmc_owner *po; 4576147191Sjkoshy struct pmc_process *ppnew, *ppold; 4577145256Sjkoshy 4578145256Sjkoshy (void) flags; /* unused parameter */ 4579145256Sjkoshy 4580145256Sjkoshy PROC_LOCK(p1); 4581145256Sjkoshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 4582145256Sjkoshy PROC_UNLOCK(p1); 4583145256Sjkoshy 4584147191Sjkoshy /* 4585147191Sjkoshy * If there are system-wide sampling PMCs active, we need to 4586147191Sjkoshy * log all fork events to their owner's logs. 4587147191Sjkoshy */ 4588147191Sjkoshy 4589147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4590147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4591147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 4592147191Sjkoshy 4593147191Sjkoshy if (!is_using_hwpmcs) 4594147191Sjkoshy return; 4595147191Sjkoshy 4596147191Sjkoshy PMC_GET_SX_XLOCK(); 4597147191Sjkoshy PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 4598147191Sjkoshy p1->p_pid, p1->p_comm, newproc); 4599147191Sjkoshy 4600147191Sjkoshy /* 4601147191Sjkoshy * If the parent process (curthread->td_proc) is a 4602147191Sjkoshy * target of any PMCs, look for PMCs that are to be 4603147191Sjkoshy * inherited, and link these into the new process 4604147191Sjkoshy * descriptor. 4605147191Sjkoshy */ 4606147191Sjkoshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 4607147191Sjkoshy PMC_FLAG_NONE)) == NULL) 4608147191Sjkoshy goto done; /* nothing to do */ 4609147191Sjkoshy 4610147191Sjkoshy do_descendants = 0; 4611147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4612147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 4613147191Sjkoshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 4614147191Sjkoshy if (do_descendants == 0) /* nothing to do */ 4615147191Sjkoshy goto done; 4616147191Sjkoshy 4617147191Sjkoshy /* allocate a descriptor for the new process */ 4618147191Sjkoshy if ((ppnew = pmc_find_process_descriptor(newproc, 4619147191Sjkoshy PMC_FLAG_ALLOCATE)) == NULL) 4620147191Sjkoshy goto done; 4621147191Sjkoshy 4622147191Sjkoshy /* 4623147191Sjkoshy * Run through all PMCs that were targeting the old process 4624147191Sjkoshy * and which specified F_DESCENDANTS and attach them to the 4625147191Sjkoshy * new process. 4626147191Sjkoshy * 4627147191Sjkoshy * Log the fork event to all owners of PMCs attached to this 4628147191Sjkoshy * process, if not already logged. 4629147191Sjkoshy */ 4630147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4631147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 4632147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 4633147191Sjkoshy pmc_link_target_process(pm, ppnew); 4634147191Sjkoshy po = pm->pm_owner; 4635147191Sjkoshy if (po->po_sscount == 0 && 4636147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 4637147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, 4638147191Sjkoshy newproc->p_pid); 4639147191Sjkoshy } 4640147191Sjkoshy 4641147191Sjkoshy /* 4642147191Sjkoshy * Now mark the new process as being tracked by this driver. 4643147191Sjkoshy */ 4644147191Sjkoshy PROC_LOCK(newproc); 4645147191Sjkoshy newproc->p_flag |= P_HWPMC; 4646147191Sjkoshy PROC_UNLOCK(newproc); 4647147191Sjkoshy 4648147191Sjkoshy done: 4649147191Sjkoshy sx_xunlock(&pmc_sx); 4650145256Sjkoshy} 4651145256Sjkoshy 4652145256Sjkoshy 4653145256Sjkoshy/* 4654145256Sjkoshy * initialization 4655145256Sjkoshy */ 4656145256Sjkoshy 4657145256Sjkoshystatic const char *pmc_name_of_pmcclass[] = { 4658145256Sjkoshy#undef __PMC_CLASS 4659145256Sjkoshy#define __PMC_CLASS(N) #N , 4660145256Sjkoshy __PMC_CLASSES() 4661145256Sjkoshy}; 4662145256Sjkoshy 4663233628Sfabient/* 4664233628Sfabient * Base class initializer: allocate structure and set default classes. 4665233628Sfabient */ 4666233628Sfabientstruct pmc_mdep * 4667233628Sfabientpmc_mdep_alloc(int nclasses) 4668233628Sfabient{ 4669233628Sfabient struct pmc_mdep *md; 4670233628Sfabient int n; 4671233628Sfabient 4672233628Sfabient /* SOFT + md classes */ 4673233628Sfabient n = 1 + nclasses; 4674233628Sfabient md = malloc(sizeof(struct pmc_mdep) + n * 4675233628Sfabient sizeof(struct pmc_classdep), M_PMC, M_WAITOK|M_ZERO); 4676233628Sfabient if (md != NULL) { 4677233628Sfabient md->pmd_nclass = n; 4678233628Sfabient 4679233628Sfabient /* Add base class. */ 4680233628Sfabient pmc_soft_initialize(md); 4681233628Sfabient } 4682233628Sfabient 4683233628Sfabient return md; 4684233628Sfabient} 4685233628Sfabient 4686233628Sfabientvoid 4687233628Sfabientpmc_mdep_free(struct pmc_mdep *md) 4688233628Sfabient{ 4689233628Sfabient pmc_soft_finalize(md); 4690233628Sfabient free(md, M_PMC); 4691233628Sfabient} 4692233628Sfabient 4693145256Sjkoshystatic int 4694233628Sfabientgeneric_switch_in(struct pmc_cpu *pc, struct pmc_process *pp) 4695233628Sfabient{ 4696233628Sfabient (void) pc; (void) pp; 4697233628Sfabient 4698233628Sfabient return (0); 4699233628Sfabient} 4700233628Sfabient 4701233628Sfabientstatic int 4702233628Sfabientgeneric_switch_out(struct pmc_cpu *pc, struct pmc_process *pp) 4703233628Sfabient{ 4704233628Sfabient (void) pc; (void) pp; 4705233628Sfabient 4706233628Sfabient return (0); 4707233628Sfabient} 4708233628Sfabient 4709233628Sfabientstatic struct pmc_mdep * 4710233628Sfabientpmc_generic_cpu_initialize(void) 4711233628Sfabient{ 4712233628Sfabient struct pmc_mdep *md; 4713233628Sfabient 4714233628Sfabient md = pmc_mdep_alloc(0); 4715233628Sfabient 4716233628Sfabient md->pmd_cputype = PMC_CPU_GENERIC; 4717233628Sfabient 4718233628Sfabient md->pmd_pcpu_init = NULL; 4719233628Sfabient md->pmd_pcpu_fini = NULL; 4720233628Sfabient md->pmd_switch_in = generic_switch_in; 4721233628Sfabient md->pmd_switch_out = generic_switch_out; 4722233628Sfabient 4723233628Sfabient return (md); 4724233628Sfabient} 4725233628Sfabient 4726233628Sfabientstatic void 4727233628Sfabientpmc_generic_cpu_finalize(struct pmc_mdep *md) 4728233628Sfabient{ 4729233628Sfabient (void) md; 4730233628Sfabient} 4731233628Sfabient 4732233628Sfabient 4733233628Sfabientstatic int 4734145256Sjkoshypmc_initialize(void) 4735145256Sjkoshy{ 4736184802Sjkoshy int c, cpu, error, n, ri; 4737183266Sjkoshy unsigned int maxcpu; 4738145256Sjkoshy struct pmc_binding pb; 4739174395Sjkoshy struct pmc_sample *ps; 4740184802Sjkoshy struct pmc_classdep *pcd; 4741147191Sjkoshy struct pmc_samplebuffer *sb; 4742145256Sjkoshy 4743145256Sjkoshy md = NULL; 4744145256Sjkoshy error = 0; 4745145256Sjkoshy 4746153110Sru#ifdef DEBUG 4747145256Sjkoshy /* parse debug flags first */ 4748145256Sjkoshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 4749145256Sjkoshy pmc_debugstr, sizeof(pmc_debugstr))) 4750145256Sjkoshy pmc_debugflags_parse(pmc_debugstr, 4751145256Sjkoshy pmc_debugstr+strlen(pmc_debugstr)); 4752145256Sjkoshy#endif 4753145256Sjkoshy 4754145256Sjkoshy PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 4755145256Sjkoshy 4756148562Sjkoshy /* check kernel version */ 4757148562Sjkoshy if (pmc_kernel_version != PMC_VERSION) { 4758148562Sjkoshy if (pmc_kernel_version == 0) 4759148562Sjkoshy printf("hwpmc: this kernel has not been compiled with " 4760148562Sjkoshy "'options HWPMC_HOOKS'.\n"); 4761148562Sjkoshy else 4762148562Sjkoshy printf("hwpmc: kernel version (0x%x) does not match " 4763148562Sjkoshy "module version (0x%x).\n", pmc_kernel_version, 4764148562Sjkoshy PMC_VERSION); 4765148562Sjkoshy return EPROGMISMATCH; 4766148562Sjkoshy } 4767148562Sjkoshy 4768145256Sjkoshy /* 4769145256Sjkoshy * check sysctl parameters 4770145256Sjkoshy */ 4771145256Sjkoshy 4772145256Sjkoshy if (pmc_hashsize <= 0) { 4773174395Sjkoshy (void) printf("hwpmc: tunable \"hashsize\"=%d must be " 4774174395Sjkoshy "greater than zero.\n", pmc_hashsize); 4775145256Sjkoshy pmc_hashsize = PMC_HASH_SIZE; 4776145256Sjkoshy } 4777145256Sjkoshy 4778147191Sjkoshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 4779174395Sjkoshy (void) printf("hwpmc: tunable \"nsamples\"=%d out of " 4780174395Sjkoshy "range.\n", pmc_nsamples); 4781147191Sjkoshy pmc_nsamples = PMC_NSAMPLES; 4782147191Sjkoshy } 4783145256Sjkoshy 4784174395Sjkoshy if (pmc_callchaindepth <= 0 || 4785174395Sjkoshy pmc_callchaindepth > PMC_CALLCHAIN_DEPTH_MAX) { 4786174395Sjkoshy (void) printf("hwpmc: tunable \"callchaindepth\"=%d out of " 4787174395Sjkoshy "range.\n", pmc_callchaindepth); 4788174395Sjkoshy pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 4789174395Sjkoshy } 4790174395Sjkoshy 4791147191Sjkoshy md = pmc_md_initialize(); 4792233628Sfabient if (md == NULL) { 4793233628Sfabient /* Default to generic CPU. */ 4794233628Sfabient md = pmc_generic_cpu_initialize(); 4795233628Sfabient if (md == NULL) 4796233628Sfabient return (ENOSYS); 4797233628Sfabient } 4798147191Sjkoshy 4799184802Sjkoshy KASSERT(md->pmd_nclass >= 1 && md->pmd_npmc >= 1, 4800184802Sjkoshy ("[pmc,%d] no classes or pmcs", __LINE__)); 4801184802Sjkoshy 4802184802Sjkoshy /* Compute the map from row-indices to classdep pointers. */ 4803184802Sjkoshy pmc_rowindex_to_classdep = malloc(sizeof(struct pmc_classdep *) * 4804184802Sjkoshy md->pmd_npmc, M_PMC, M_WAITOK|M_ZERO); 4805184802Sjkoshy 4806184802Sjkoshy for (n = 0; n < md->pmd_npmc; n++) 4807184802Sjkoshy pmc_rowindex_to_classdep[n] = NULL; 4808184802Sjkoshy for (ri = c = 0; c < md->pmd_nclass; c++) { 4809184802Sjkoshy pcd = &md->pmd_classdep[c]; 4810184802Sjkoshy for (n = 0; n < pcd->pcd_num; n++, ri++) 4811184802Sjkoshy pmc_rowindex_to_classdep[ri] = pcd; 4812184802Sjkoshy } 4813184802Sjkoshy 4814184802Sjkoshy KASSERT(ri == md->pmd_npmc, 4815184802Sjkoshy ("[pmc,%d] npmc miscomputed: ri=%d, md->npmc=%d", __LINE__, 4816184802Sjkoshy ri, md->pmd_npmc)); 4817184802Sjkoshy 4818183266Sjkoshy maxcpu = pmc_cpu_max(); 4819183266Sjkoshy 4820145256Sjkoshy /* allocate space for the per-cpu array */ 4821184802Sjkoshy pmc_pcpu = malloc(maxcpu * sizeof(struct pmc_cpu *), M_PMC, 4822184802Sjkoshy M_WAITOK|M_ZERO); 4823145256Sjkoshy 4824145256Sjkoshy /* per-cpu 'saved values' for managing process-mode PMCs */ 4825184214Sdes pmc_pcpu_saved = malloc(sizeof(pmc_value_t) * maxcpu * md->pmd_npmc, 4826184214Sdes M_PMC, M_WAITOK); 4827145256Sjkoshy 4828183266Sjkoshy /* Perform CPU-dependent initialization. */ 4829145256Sjkoshy pmc_save_cpu_binding(&pb); 4830184802Sjkoshy error = 0; 4831184802Sjkoshy for (cpu = 0; error == 0 && cpu < maxcpu; cpu++) { 4832183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4833145256Sjkoshy continue; 4834145256Sjkoshy pmc_select_cpu(cpu); 4835184802Sjkoshy pmc_pcpu[cpu] = malloc(sizeof(struct pmc_cpu) + 4836184802Sjkoshy md->pmd_npmc * sizeof(struct pmc_hw *), M_PMC, 4837184802Sjkoshy M_WAITOK|M_ZERO); 4838184802Sjkoshy if (md->pmd_pcpu_init) 4839185363Sjkoshy error = md->pmd_pcpu_init(md, cpu); 4840184802Sjkoshy for (n = 0; error == 0 && n < md->pmd_nclass; n++) 4841184802Sjkoshy error = md->pmd_classdep[n].pcd_pcpu_init(md, cpu); 4842145256Sjkoshy } 4843145256Sjkoshy pmc_restore_cpu_binding(&pb); 4844145256Sjkoshy 4845184802Sjkoshy if (error) 4846184802Sjkoshy return (error); 4847145256Sjkoshy 4848147191Sjkoshy /* allocate space for the sample array */ 4849183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 4850183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4851147191Sjkoshy continue; 4852184802Sjkoshy 4853184214Sdes sb = malloc(sizeof(struct pmc_samplebuffer) + 4854147191Sjkoshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4855147191Sjkoshy M_WAITOK|M_ZERO); 4856147191Sjkoshy sb->ps_read = sb->ps_write = sb->ps_samples; 4857153735Sjkoshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4858184802Sjkoshy 4859147191Sjkoshy KASSERT(pmc_pcpu[cpu] != NULL, 4860147191Sjkoshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4861147191Sjkoshy 4862184802Sjkoshy sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples * 4863184802Sjkoshy sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO); 4864174395Sjkoshy 4865174395Sjkoshy for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4866174395Sjkoshy ps->ps_pc = sb->ps_callchains + 4867174395Sjkoshy (n * pmc_callchaindepth); 4868174395Sjkoshy 4869233628Sfabient pmc_pcpu[cpu]->pc_sb[PMC_HR] = sb; 4870233628Sfabient 4871233628Sfabient sb = malloc(sizeof(struct pmc_samplebuffer) + 4872233628Sfabient pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4873233628Sfabient M_WAITOK|M_ZERO); 4874233628Sfabient sb->ps_read = sb->ps_write = sb->ps_samples; 4875233628Sfabient sb->ps_fence = sb->ps_samples + pmc_nsamples; 4876233628Sfabient 4877233628Sfabient KASSERT(pmc_pcpu[cpu] != NULL, 4878233628Sfabient ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4879233628Sfabient 4880233628Sfabient sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples * 4881233628Sfabient sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO); 4882233628Sfabient 4883233628Sfabient for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4884233628Sfabient ps->ps_pc = sb->ps_callchains + 4885233628Sfabient (n * pmc_callchaindepth); 4886233628Sfabient 4887233628Sfabient pmc_pcpu[cpu]->pc_sb[PMC_SR] = sb; 4888147191Sjkoshy } 4889147191Sjkoshy 4890145256Sjkoshy /* allocate space for the row disposition array */ 4891145256Sjkoshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 4892145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4893145256Sjkoshy 4894145256Sjkoshy KASSERT(pmc_pmcdisp != NULL, 4895145256Sjkoshy ("[pmc,%d] pmcdisp allocation returned NULL", __LINE__)); 4896145256Sjkoshy 4897145256Sjkoshy /* mark all PMCs as available */ 4898145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 4899145256Sjkoshy PMC_MARK_ROW_FREE(n); 4900145256Sjkoshy 4901145256Sjkoshy /* allocate thread hash tables */ 4902145256Sjkoshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 4903145256Sjkoshy &pmc_ownerhashmask); 4904145256Sjkoshy 4905145256Sjkoshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 4906145256Sjkoshy &pmc_processhashmask); 4907168856Sjkoshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc-leaf", 4908168856Sjkoshy MTX_SPIN); 4909145256Sjkoshy 4910147191Sjkoshy LIST_INIT(&pmc_ss_owners); 4911147191Sjkoshy pmc_ss_count = 0; 4912147191Sjkoshy 4913145256Sjkoshy /* allocate a pool of spin mutexes */ 4914168856Sjkoshy pmc_mtxpool = mtx_pool_create("pmc-leaf", pmc_mtxpool_size, 4915168856Sjkoshy MTX_SPIN); 4916145256Sjkoshy 4917145256Sjkoshy PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4918145256Sjkoshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4919145256Sjkoshy pmc_processhash, pmc_processhashmask); 4920145256Sjkoshy 4921145256Sjkoshy /* register process {exit,fork,exec} handlers */ 4922145256Sjkoshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4923145256Sjkoshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4924145256Sjkoshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4925145256Sjkoshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4926145256Sjkoshy 4927147191Sjkoshy /* initialize logging */ 4928147191Sjkoshy pmclog_initialize(); 4929147191Sjkoshy 4930145256Sjkoshy /* set hook functions */ 4931145256Sjkoshy pmc_intr = md->pmd_intr; 4932145256Sjkoshy pmc_hook = pmc_hook_handler; 4933145256Sjkoshy 4934145256Sjkoshy if (error == 0) { 4935145256Sjkoshy printf(PMC_MODULE_NAME ":"); 4936149373Sjkoshy for (n = 0; n < (int) md->pmd_nclass; n++) { 4937184802Sjkoshy pcd = &md->pmd_classdep[n]; 4938184997Sjkoshy printf(" %s/%d/%d/0x%b", 4939184802Sjkoshy pmc_name_of_pmcclass[pcd->pcd_class], 4940184802Sjkoshy pcd->pcd_num, 4941184997Sjkoshy pcd->pcd_width, 4942184802Sjkoshy pcd->pcd_caps, 4943149373Sjkoshy "\20" 4944149373Sjkoshy "\1INT\2USR\3SYS\4EDG\5THR" 4945149373Sjkoshy "\6REA\7WRI\10INV\11QUA\12PRC" 4946149373Sjkoshy "\13TAG\14CSC"); 4947149373Sjkoshy } 4948145256Sjkoshy printf("\n"); 4949145256Sjkoshy } 4950145256Sjkoshy 4951184802Sjkoshy return (error); 4952145256Sjkoshy} 4953145256Sjkoshy 4954145256Sjkoshy/* prepare to be unloaded */ 4955145256Sjkoshystatic void 4956145256Sjkoshypmc_cleanup(void) 4957145256Sjkoshy{ 4958184802Sjkoshy int c, cpu; 4959183266Sjkoshy unsigned int maxcpu; 4960145256Sjkoshy struct pmc_ownerhash *ph; 4961145256Sjkoshy struct pmc_owner *po, *tmp; 4962145256Sjkoshy struct pmc_binding pb; 4963153110Sru#ifdef DEBUG 4964145256Sjkoshy struct pmc_processhash *prh; 4965145256Sjkoshy#endif 4966145256Sjkoshy 4967145256Sjkoshy PMCDBG(MOD,INI,0, "%s", "cleanup"); 4968145256Sjkoshy 4969147191Sjkoshy /* switch off sampling */ 4970222813Sattilio CPU_ZERO(&pmc_cpumask); 4971147191Sjkoshy pmc_intr = NULL; 4972145256Sjkoshy 4973145256Sjkoshy sx_xlock(&pmc_sx); 4974145256Sjkoshy if (pmc_hook == NULL) { /* being unloaded already */ 4975145256Sjkoshy sx_xunlock(&pmc_sx); 4976145256Sjkoshy return; 4977145256Sjkoshy } 4978145256Sjkoshy 4979145256Sjkoshy pmc_hook = NULL; /* prevent new threads from entering module */ 4980145256Sjkoshy 4981145256Sjkoshy /* deregister event handlers */ 4982145256Sjkoshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 4983145256Sjkoshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 4984145256Sjkoshy 4985145256Sjkoshy /* send SIGBUS to all owner threads, free up allocations */ 4986145256Sjkoshy if (pmc_ownerhash) 4987145256Sjkoshy for (ph = pmc_ownerhash; 4988145256Sjkoshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 4989145256Sjkoshy ph++) { 4990145256Sjkoshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 4991145256Sjkoshy pmc_remove_owner(po); 4992145256Sjkoshy 4993145256Sjkoshy /* send SIGBUS to owner processes */ 4994145256Sjkoshy PMCDBG(MOD,INI,2, "cleanup signal proc=%p " 4995145256Sjkoshy "(%d, %s)", po->po_owner, 4996145256Sjkoshy po->po_owner->p_pid, 4997145256Sjkoshy po->po_owner->p_comm); 4998145256Sjkoshy 4999145256Sjkoshy PROC_LOCK(po->po_owner); 5000225617Skmacy kern_psignal(po->po_owner, SIGBUS); 5001145256Sjkoshy PROC_UNLOCK(po->po_owner); 5002147191Sjkoshy 5003147191Sjkoshy pmc_destroy_owner_descriptor(po); 5004145256Sjkoshy } 5005145256Sjkoshy } 5006145256Sjkoshy 5007145256Sjkoshy /* reclaim allocated data structures */ 5008145256Sjkoshy if (pmc_mtxpool) 5009145256Sjkoshy mtx_pool_destroy(&pmc_mtxpool); 5010145256Sjkoshy 5011145256Sjkoshy mtx_destroy(&pmc_processhash_mtx); 5012145256Sjkoshy if (pmc_processhash) { 5013153110Sru#ifdef DEBUG 5014145256Sjkoshy struct pmc_process *pp; 5015145256Sjkoshy 5016145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy process hash"); 5017145256Sjkoshy for (prh = pmc_processhash; 5018145256Sjkoshy prh <= &pmc_processhash[pmc_processhashmask]; 5019145256Sjkoshy prh++) 5020145256Sjkoshy LIST_FOREACH(pp, prh, pp_next) 5021145256Sjkoshy PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 5022145256Sjkoshy#endif 5023145256Sjkoshy 5024145256Sjkoshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 5025145256Sjkoshy pmc_processhash = NULL; 5026145256Sjkoshy } 5027145256Sjkoshy 5028145256Sjkoshy if (pmc_ownerhash) { 5029145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy owner hash"); 5030145256Sjkoshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 5031145256Sjkoshy pmc_ownerhash = NULL; 5032145256Sjkoshy } 5033145256Sjkoshy 5034147191Sjkoshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 5035147191Sjkoshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 5036147191Sjkoshy KASSERT(pmc_ss_count == 0, 5037147191Sjkoshy ("[pmc,%d] Global SS count not empty", __LINE__)); 5038147191Sjkoshy 5039184802Sjkoshy /* do processor and pmc-class dependent cleanup */ 5040183266Sjkoshy maxcpu = pmc_cpu_max(); 5041153735Sjkoshy 5042145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "md cleanup"); 5043145256Sjkoshy if (md) { 5044145256Sjkoshy pmc_save_cpu_binding(&pb); 5045183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 5046145256Sjkoshy PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 5047145256Sjkoshy cpu, pmc_pcpu[cpu]); 5048183266Sjkoshy if (!pmc_cpu_is_active(cpu) || pmc_pcpu[cpu] == NULL) 5049145256Sjkoshy continue; 5050145256Sjkoshy pmc_select_cpu(cpu); 5051184802Sjkoshy for (c = 0; c < md->pmd_nclass; c++) 5052184802Sjkoshy md->pmd_classdep[c].pcd_pcpu_fini(md, cpu); 5053184802Sjkoshy if (md->pmd_pcpu_fini) 5054185363Sjkoshy md->pmd_pcpu_fini(md, cpu); 5055145256Sjkoshy } 5056184994Sjkoshy 5057233628Sfabient if (md->pmd_cputype == PMC_CPU_GENERIC) 5058233628Sfabient pmc_generic_cpu_finalize(md); 5059233628Sfabient else 5060233628Sfabient pmc_md_finalize(md); 5061184994Sjkoshy 5062233628Sfabient pmc_mdep_free(md); 5063145256Sjkoshy md = NULL; 5064145256Sjkoshy pmc_restore_cpu_binding(&pb); 5065145256Sjkoshy } 5066145256Sjkoshy 5067184802Sjkoshy /* Free per-cpu descriptors. */ 5068184802Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 5069184802Sjkoshy if (!pmc_cpu_is_active(cpu)) 5070184802Sjkoshy continue; 5071233628Sfabient KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_HR] != NULL, 5072233628Sfabient ("[pmc,%d] Null hw cpu sample buffer cpu=%d", __LINE__, 5073184802Sjkoshy cpu)); 5074233628Sfabient KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_SR] != NULL, 5075233628Sfabient ("[pmc,%d] Null sw cpu sample buffer cpu=%d", __LINE__, 5076233628Sfabient cpu)); 5077233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_HR]->ps_callchains, M_PMC); 5078233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_HR], M_PMC); 5079233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_SR]->ps_callchains, M_PMC); 5080233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_SR], M_PMC); 5081184802Sjkoshy free(pmc_pcpu[cpu], M_PMC); 5082184802Sjkoshy } 5083184802Sjkoshy 5084184205Sdes free(pmc_pcpu, M_PMC); 5085145256Sjkoshy pmc_pcpu = NULL; 5086145256Sjkoshy 5087184205Sdes free(pmc_pcpu_saved, M_PMC); 5088145256Sjkoshy pmc_pcpu_saved = NULL; 5089145256Sjkoshy 5090145256Sjkoshy if (pmc_pmcdisp) { 5091184205Sdes free(pmc_pmcdisp, M_PMC); 5092145256Sjkoshy pmc_pmcdisp = NULL; 5093145256Sjkoshy } 5094145256Sjkoshy 5095184802Sjkoshy if (pmc_rowindex_to_classdep) { 5096184802Sjkoshy free(pmc_rowindex_to_classdep, M_PMC); 5097184802Sjkoshy pmc_rowindex_to_classdep = NULL; 5098184802Sjkoshy } 5099184802Sjkoshy 5100147191Sjkoshy pmclog_shutdown(); 5101147191Sjkoshy 5102145256Sjkoshy sx_xunlock(&pmc_sx); /* we are done */ 5103145256Sjkoshy} 5104145256Sjkoshy 5105145256Sjkoshy/* 5106145256Sjkoshy * The function called at load/unload. 5107145256Sjkoshy */ 5108145256Sjkoshy 5109145256Sjkoshystatic int 5110145256Sjkoshyload (struct module *module __unused, int cmd, void *arg __unused) 5111145256Sjkoshy{ 5112145256Sjkoshy int error; 5113145256Sjkoshy 5114145256Sjkoshy error = 0; 5115145256Sjkoshy 5116145256Sjkoshy switch (cmd) { 5117145256Sjkoshy case MOD_LOAD : 5118145256Sjkoshy /* initialize the subsystem */ 5119145256Sjkoshy error = pmc_initialize(); 5120145256Sjkoshy if (error != 0) 5121145256Sjkoshy break; 5122183266Sjkoshy PMCDBG(MOD,INI,1, "syscall=%d maxcpu=%d", 5123183266Sjkoshy pmc_syscall_num, pmc_cpu_max()); 5124145256Sjkoshy break; 5125145256Sjkoshy 5126145256Sjkoshy 5127145256Sjkoshy case MOD_UNLOAD : 5128145256Sjkoshy case MOD_SHUTDOWN: 5129145256Sjkoshy pmc_cleanup(); 5130145256Sjkoshy PMCDBG(MOD,INI,1, "%s", "unloaded"); 5131145256Sjkoshy break; 5132145256Sjkoshy 5133145256Sjkoshy default : 5134145256Sjkoshy error = EINVAL; /* XXX should panic(9) */ 5135145256Sjkoshy break; 5136145256Sjkoshy } 5137145256Sjkoshy 5138145256Sjkoshy return error; 5139145256Sjkoshy} 5140145256Sjkoshy 5141145256Sjkoshy/* memory pool */ 5142145256SjkoshyMALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 5143