hwpmc_mod.c revision 185363
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 185363 2008-11-27 09:00:47Z jkoshy $"); 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> 44145256Sjkoshy#include <sys/mutex.h> 45145256Sjkoshy#include <sys/pmc.h> 46145256Sjkoshy#include <sys/pmckern.h> 47147191Sjkoshy#include <sys/pmclog.h> 48164033Srwatson#include <sys/priv.h> 49145256Sjkoshy#include <sys/proc.h> 50145256Sjkoshy#include <sys/queue.h> 51147191Sjkoshy#include <sys/resourcevar.h> 52145256Sjkoshy#include <sys/sched.h> 53145256Sjkoshy#include <sys/signalvar.h> 54145256Sjkoshy#include <sys/smp.h> 55145256Sjkoshy#include <sys/sx.h> 56145256Sjkoshy#include <sys/sysctl.h> 57145256Sjkoshy#include <sys/sysent.h> 58145256Sjkoshy#include <sys/systm.h> 59147191Sjkoshy#include <sys/vnode.h> 60145256Sjkoshy 61157144Sjkoshy#include <sys/linker.h> /* needs to be after <sys/malloc.h> */ 62157144Sjkoshy 63147191Sjkoshy#include <machine/atomic.h> 64145256Sjkoshy#include <machine/md_var.h> 65145256Sjkoshy 66145256Sjkoshy/* 67145256Sjkoshy * Types 68145256Sjkoshy */ 69145256Sjkoshy 70145256Sjkoshyenum pmc_flags { 71145256Sjkoshy PMC_FLAG_NONE = 0x00, /* do nothing */ 72145256Sjkoshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 73145256Sjkoshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 74145256Sjkoshy}; 75145256Sjkoshy 76145256Sjkoshy/* 77145256Sjkoshy * The offset in sysent where the syscall is allocated. 78145256Sjkoshy */ 79145256Sjkoshy 80145256Sjkoshystatic int pmc_syscall_num = NO_SYSCALL; 81145256Sjkoshystruct pmc_cpu **pmc_pcpu; /* per-cpu state */ 82145256Sjkoshypmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 83145256Sjkoshy 84145256Sjkoshy#define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 85145256Sjkoshy 86145256Sjkoshystruct mtx_pool *pmc_mtxpool; 87145256Sjkoshystatic int *pmc_pmcdisp; /* PMC row dispositions */ 88145256Sjkoshy 89145256Sjkoshy#define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 90145256Sjkoshy#define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 91145256Sjkoshy#define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 92145256Sjkoshy 93145256Sjkoshy#define PMC_MARK_ROW_FREE(R) do { \ 94145256Sjkoshy pmc_pmcdisp[(R)] = 0; \ 95145256Sjkoshy} while (0) 96145256Sjkoshy 97145256Sjkoshy#define PMC_MARK_ROW_STANDALONE(R) do { \ 98145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 99145256Sjkoshy __LINE__)); \ 100145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 101183266Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= (-pmc_cpu_max_active()), \ 102183266Sjkoshy ("[pmc,%d] row disposition error", __LINE__)); \ 103145256Sjkoshy} while (0) 104145256Sjkoshy 105145256Sjkoshy#define PMC_UNMARK_ROW_STANDALONE(R) do { \ 106145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 107145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 108145256Sjkoshy __LINE__)); \ 109145256Sjkoshy} while (0) 110145256Sjkoshy 111145256Sjkoshy#define PMC_MARK_ROW_THREAD(R) do { \ 112145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 113145256Sjkoshy __LINE__)); \ 114145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 115145256Sjkoshy} while (0) 116145256Sjkoshy 117145256Sjkoshy#define PMC_UNMARK_ROW_THREAD(R) do { \ 118145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 119145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 120145256Sjkoshy __LINE__)); \ 121145256Sjkoshy} while (0) 122145256Sjkoshy 123145256Sjkoshy 124145256Sjkoshy/* various event handlers */ 125145256Sjkoshystatic eventhandler_tag pmc_exit_tag, pmc_fork_tag; 126145256Sjkoshy 127145256Sjkoshy/* Module statistics */ 128145256Sjkoshystruct pmc_op_getdriverstats pmc_stats; 129145256Sjkoshy 130145256Sjkoshy/* Machine/processor dependent operations */ 131185363Sjkoshystatic struct pmc_mdep *md; 132145256Sjkoshy 133145256Sjkoshy/* 134145256Sjkoshy * Hash tables mapping owner processes and target threads to PMCs. 135145256Sjkoshy */ 136145256Sjkoshy 137145256Sjkoshystruct mtx pmc_processhash_mtx; /* spin mutex */ 138145256Sjkoshystatic u_long pmc_processhashmask; 139145256Sjkoshystatic LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 140145256Sjkoshy 141145256Sjkoshy/* 142145256Sjkoshy * Hash table of PMC owner descriptors. This table is protected by 143145256Sjkoshy * the shared PMC "sx" lock. 144145256Sjkoshy */ 145145256Sjkoshy 146145256Sjkoshystatic u_long pmc_ownerhashmask; 147145256Sjkoshystatic LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 148145256Sjkoshy 149145256Sjkoshy/* 150147191Sjkoshy * List of PMC owners with system-wide sampling PMCs. 151147191Sjkoshy */ 152147191Sjkoshy 153147191Sjkoshystatic LIST_HEAD(, pmc_owner) pmc_ss_owners; 154147191Sjkoshy 155147191Sjkoshy 156147191Sjkoshy/* 157184802Sjkoshy * A map of row indices to classdep structures. 158184802Sjkoshy */ 159184802Sjkoshystatic struct pmc_classdep **pmc_rowindex_to_classdep; 160184802Sjkoshy 161184802Sjkoshy/* 162145256Sjkoshy * Prototypes 163145256Sjkoshy */ 164145256Sjkoshy 165153110Sru#ifdef DEBUG 166145256Sjkoshystatic int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 167145256Sjkoshystatic int pmc_debugflags_parse(char *newstr, char *fence); 168145256Sjkoshy#endif 169145256Sjkoshy 170145256Sjkoshystatic int load(struct module *module, int cmd, void *arg); 171147191Sjkoshystatic int pmc_attach_process(struct proc *p, struct pmc *pm); 172145256Sjkoshystatic struct pmc *pmc_allocate_pmc_descriptor(void); 173147191Sjkoshystatic struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 174147191Sjkoshystatic int pmc_attach_one_process(struct proc *p, struct pmc *pm); 175147191Sjkoshystatic int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 176147191Sjkoshy int cpu); 177147191Sjkoshystatic int pmc_can_attach(struct pmc *pm, struct proc *p); 178174395Sjkoshystatic void pmc_capture_user_callchain(int cpu, struct trapframe *tf); 179147191Sjkoshystatic void pmc_cleanup(void); 180147191Sjkoshystatic int pmc_detach_process(struct proc *p, struct pmc *pm); 181147191Sjkoshystatic int pmc_detach_one_process(struct proc *p, struct pmc *pm, 182147191Sjkoshy int flags); 183147191Sjkoshystatic void pmc_destroy_owner_descriptor(struct pmc_owner *po); 184147191Sjkoshystatic struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 185147191Sjkoshystatic int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 186145256Sjkoshystatic struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 187145256Sjkoshy pmc_id_t pmc); 188145256Sjkoshystatic struct pmc_process *pmc_find_process_descriptor(struct proc *p, 189145256Sjkoshy uint32_t mode); 190145774Sjkoshystatic void pmc_force_context_switch(void); 191145256Sjkoshystatic void pmc_link_target_process(struct pmc *pm, 192145256Sjkoshy struct pmc_process *pp); 193174395Sjkoshystatic void pmc_log_all_process_mappings(struct pmc_owner *po); 194174395Sjkoshystatic void pmc_log_kernel_mappings(struct pmc *pm); 195174395Sjkoshystatic void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p); 196147191Sjkoshystatic void pmc_maybe_remove_owner(struct pmc_owner *po); 197147191Sjkoshystatic void pmc_process_csw_in(struct thread *td); 198147191Sjkoshystatic void pmc_process_csw_out(struct thread *td); 199145256Sjkoshystatic void pmc_process_exit(void *arg, struct proc *p); 200145256Sjkoshystatic void pmc_process_fork(void *arg, struct proc *p1, 201145256Sjkoshy struct proc *p2, int n); 202147191Sjkoshystatic void pmc_process_samples(int cpu); 203147191Sjkoshystatic void pmc_release_pmc_descriptor(struct pmc *pmc); 204147191Sjkoshystatic void pmc_remove_owner(struct pmc_owner *po); 205147191Sjkoshystatic void pmc_remove_process_descriptor(struct pmc_process *pp); 206147191Sjkoshystatic void pmc_restore_cpu_binding(struct pmc_binding *pb); 207147191Sjkoshystatic void pmc_save_cpu_binding(struct pmc_binding *pb); 208147191Sjkoshystatic void pmc_select_cpu(int cpu); 209145256Sjkoshystatic int pmc_start(struct pmc *pm); 210145256Sjkoshystatic int pmc_stop(struct pmc *pm); 211147191Sjkoshystatic int pmc_syscall_handler(struct thread *td, void *syscall_args); 212147191Sjkoshystatic void pmc_unlink_target_process(struct pmc *pmc, 213147191Sjkoshy struct pmc_process *pp); 214145256Sjkoshy 215145256Sjkoshy/* 216145256Sjkoshy * Kernel tunables and sysctl(8) interface. 217145256Sjkoshy */ 218145256Sjkoshy 219145256SjkoshySYSCTL_NODE(_kern, OID_AUTO, hwpmc, CTLFLAG_RW, 0, "HWPMC parameters"); 220145256Sjkoshy 221174395Sjkoshystatic int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 222174395SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "callchaindepth", &pmc_callchaindepth); 223174395SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_TUN|CTLFLAG_RD, 224174395Sjkoshy &pmc_callchaindepth, 0, "depth of call chain records"); 225174395Sjkoshy 226153110Sru#ifdef DEBUG 227147191Sjkoshystruct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 228145256Sjkoshychar pmc_debugstr[PMC_DEBUG_STRSIZE]; 229145256SjkoshyTUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 230145256Sjkoshy sizeof(pmc_debugstr)); 231145256SjkoshySYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 232145256Sjkoshy CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN, 233145256Sjkoshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 234145256Sjkoshy#endif 235145256Sjkoshy 236145256Sjkoshy/* 237147191Sjkoshy * kern.hwpmc.hashrows -- determines the number of rows in the 238145256Sjkoshy * of the hash table used to look up threads 239145256Sjkoshy */ 240145256Sjkoshy 241145256Sjkoshystatic int pmc_hashsize = PMC_HASH_SIZE; 242145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize); 243145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD, 244145256Sjkoshy &pmc_hashsize, 0, "rows in hash tables"); 245145256Sjkoshy 246145256Sjkoshy/* 247174395Sjkoshy * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU 248145256Sjkoshy */ 249145256Sjkoshy 250147191Sjkoshystatic int pmc_nsamples = PMC_NSAMPLES; 251147191SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nsamples", &pmc_nsamples); 252147191SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_TUN|CTLFLAG_RD, 253147191Sjkoshy &pmc_nsamples, 0, "number of PC samples per CPU"); 254145256Sjkoshy 255174395Sjkoshy 256145256Sjkoshy/* 257147191Sjkoshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 258145256Sjkoshy */ 259145256Sjkoshy 260145256Sjkoshystatic int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 261145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size); 262145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD, 263145256Sjkoshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 264145256Sjkoshy 265145256Sjkoshy 266145256Sjkoshy/* 267145256Sjkoshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 268145256Sjkoshy * allocate system-wide PMCs. 269145256Sjkoshy * 270145256Sjkoshy * Allowing unprivileged processes to allocate system PMCs is convenient 271145256Sjkoshy * if system-wide measurements need to be taken concurrently with other 272145256Sjkoshy * per-process measurements. This feature is turned off by default. 273145256Sjkoshy */ 274145256Sjkoshy 275145256Sjkoshystatic int pmc_unprivileged_syspmcs = 0; 276145256SjkoshyTUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs); 277145256SjkoshySYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW, 278145256Sjkoshy &pmc_unprivileged_syspmcs, 0, 279145256Sjkoshy "allow unprivileged process to allocate system PMCs"); 280145256Sjkoshy 281147191Sjkoshy/* 282147191Sjkoshy * Hash function. Discard the lower 2 bits of the pointer since 283147191Sjkoshy * these are always zero for our uses. The hash multiplier is 284147191Sjkoshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 285147191Sjkoshy */ 286145256Sjkoshy 287145256Sjkoshy#if LONG_BIT == 64 288145256Sjkoshy#define _PMC_HM 11400714819323198486u 289145256Sjkoshy#elif LONG_BIT == 32 290145256Sjkoshy#define _PMC_HM 2654435769u 291145256Sjkoshy#else 292145256Sjkoshy#error Must know the size of 'long' to compile 293145256Sjkoshy#endif 294145256Sjkoshy 295145256Sjkoshy#define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 296145256Sjkoshy 297145256Sjkoshy/* 298145256Sjkoshy * Syscall structures 299145256Sjkoshy */ 300145256Sjkoshy 301145256Sjkoshy/* The `sysent' for the new syscall */ 302145256Sjkoshystatic struct sysent pmc_sysent = { 303145256Sjkoshy 2, /* sy_narg */ 304145256Sjkoshy pmc_syscall_handler /* sy_call */ 305145256Sjkoshy}; 306145256Sjkoshy 307145256Sjkoshystatic struct syscall_module_data pmc_syscall_mod = { 308145256Sjkoshy load, 309145256Sjkoshy NULL, 310145256Sjkoshy &pmc_syscall_num, 311145256Sjkoshy &pmc_sysent, 312145256Sjkoshy { 0, NULL } 313145256Sjkoshy}; 314145256Sjkoshy 315145256Sjkoshystatic moduledata_t pmc_mod = { 316145256Sjkoshy PMC_MODULE_NAME, 317145256Sjkoshy syscall_module_handler, 318145256Sjkoshy &pmc_syscall_mod 319145256Sjkoshy}; 320145256Sjkoshy 321145256SjkoshyDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 322145256SjkoshyMODULE_VERSION(pmc, PMC_VERSION); 323145256Sjkoshy 324153110Sru#ifdef DEBUG 325147191Sjkoshyenum pmc_dbgparse_state { 326147191Sjkoshy PMCDS_WS, /* in whitespace */ 327147191Sjkoshy PMCDS_MAJOR, /* seen a major keyword */ 328147191Sjkoshy PMCDS_MINOR 329147191Sjkoshy}; 330147191Sjkoshy 331145256Sjkoshystatic int 332145256Sjkoshypmc_debugflags_parse(char *newstr, char *fence) 333145256Sjkoshy{ 334145313Sjkoshy char c, *p, *q; 335147191Sjkoshy struct pmc_debugflags *tmpflags; 336147191Sjkoshy int error, found, *newbits, tmp; 337147191Sjkoshy size_t kwlen; 338145256Sjkoshy 339184214Sdes tmpflags = malloc(sizeof(*tmpflags), M_PMC, M_WAITOK|M_ZERO); 340145256Sjkoshy 341145256Sjkoshy p = newstr; 342147191Sjkoshy error = 0; 343145256Sjkoshy 344147191Sjkoshy for (; p < fence && (c = *p); p++) { 345145256Sjkoshy 346147191Sjkoshy /* skip white space */ 347147191Sjkoshy if (c == ' ' || c == '\t') 348147191Sjkoshy continue; 349147191Sjkoshy 350147191Sjkoshy /* look for a keyword followed by "=" */ 351147191Sjkoshy for (q = p; p < fence && (c = *p) && c != '='; p++) 352147191Sjkoshy ; 353147191Sjkoshy if (c != '=') { 354147191Sjkoshy error = EINVAL; 355147191Sjkoshy goto done; 356145256Sjkoshy } 357145256Sjkoshy 358147191Sjkoshy kwlen = p - q; 359147191Sjkoshy newbits = NULL; 360145256Sjkoshy 361147191Sjkoshy /* lookup flag group name */ 362147191Sjkoshy#define DBG_SET_FLAG_MAJ(S,F) \ 363147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 364147191Sjkoshy newbits = &tmpflags->pdb_ ## F; 365145256Sjkoshy 366147191Sjkoshy DBG_SET_FLAG_MAJ("cpu", CPU); 367147191Sjkoshy DBG_SET_FLAG_MAJ("csw", CSW); 368147191Sjkoshy DBG_SET_FLAG_MAJ("logging", LOG); 369147191Sjkoshy DBG_SET_FLAG_MAJ("module", MOD); 370147191Sjkoshy DBG_SET_FLAG_MAJ("md", MDP); 371147191Sjkoshy DBG_SET_FLAG_MAJ("owner", OWN); 372147191Sjkoshy DBG_SET_FLAG_MAJ("pmc", PMC); 373147191Sjkoshy DBG_SET_FLAG_MAJ("process", PRC); 374147191Sjkoshy DBG_SET_FLAG_MAJ("sampling", SAM); 375145256Sjkoshy 376147191Sjkoshy if (newbits == NULL) { 377147191Sjkoshy error = EINVAL; 378147191Sjkoshy goto done; 379145256Sjkoshy } 380145256Sjkoshy 381147191Sjkoshy p++; /* skip the '=' */ 382145256Sjkoshy 383147191Sjkoshy /* Now parse the individual flags */ 384147191Sjkoshy tmp = 0; 385147191Sjkoshy newflag: 386147191Sjkoshy for (q = p; p < fence && (c = *p); p++) 387147191Sjkoshy if (c == ' ' || c == '\t' || c == ',') 388147191Sjkoshy break; 389147191Sjkoshy 390147191Sjkoshy /* p == fence or c == ws or c == "," or c == 0 */ 391147191Sjkoshy 392147191Sjkoshy if ((kwlen = p - q) == 0) { 393147191Sjkoshy *newbits = tmp; 394147191Sjkoshy continue; 395147191Sjkoshy } 396147191Sjkoshy 397147191Sjkoshy found = 0; 398147191Sjkoshy#define DBG_SET_FLAG_MIN(S,F) \ 399147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 400147191Sjkoshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 401147191Sjkoshy 402147191Sjkoshy /* a '*' denotes all possible flags in the group */ 403147191Sjkoshy if (kwlen == 1 && *q == '*') 404147191Sjkoshy tmp = found = ~0; 405147191Sjkoshy /* look for individual flag names */ 406147191Sjkoshy DBG_SET_FLAG_MIN("allocaterow", ALR); 407147191Sjkoshy DBG_SET_FLAG_MIN("allocate", ALL); 408147191Sjkoshy DBG_SET_FLAG_MIN("attach", ATT); 409147191Sjkoshy DBG_SET_FLAG_MIN("bind", BND); 410147191Sjkoshy DBG_SET_FLAG_MIN("config", CFG); 411147191Sjkoshy DBG_SET_FLAG_MIN("exec", EXC); 412147191Sjkoshy DBG_SET_FLAG_MIN("exit", EXT); 413147191Sjkoshy DBG_SET_FLAG_MIN("find", FND); 414147191Sjkoshy DBG_SET_FLAG_MIN("flush", FLS); 415147191Sjkoshy DBG_SET_FLAG_MIN("fork", FRK); 416147191Sjkoshy DBG_SET_FLAG_MIN("getbuf", GTB); 417147191Sjkoshy DBG_SET_FLAG_MIN("hook", PMH); 418147191Sjkoshy DBG_SET_FLAG_MIN("init", INI); 419147191Sjkoshy DBG_SET_FLAG_MIN("intr", INT); 420147191Sjkoshy DBG_SET_FLAG_MIN("linktarget", TLK); 421147191Sjkoshy DBG_SET_FLAG_MIN("mayberemove", OMR); 422147191Sjkoshy DBG_SET_FLAG_MIN("ops", OPS); 423147191Sjkoshy DBG_SET_FLAG_MIN("read", REA); 424147191Sjkoshy DBG_SET_FLAG_MIN("register", REG); 425147191Sjkoshy DBG_SET_FLAG_MIN("release", REL); 426147191Sjkoshy DBG_SET_FLAG_MIN("remove", ORM); 427147191Sjkoshy DBG_SET_FLAG_MIN("sample", SAM); 428147191Sjkoshy DBG_SET_FLAG_MIN("scheduleio", SIO); 429147191Sjkoshy DBG_SET_FLAG_MIN("select", SEL); 430147191Sjkoshy DBG_SET_FLAG_MIN("signal", SIG); 431147191Sjkoshy DBG_SET_FLAG_MIN("swi", SWI); 432147191Sjkoshy DBG_SET_FLAG_MIN("swo", SWO); 433147191Sjkoshy DBG_SET_FLAG_MIN("start", STA); 434147191Sjkoshy DBG_SET_FLAG_MIN("stop", STO); 435147191Sjkoshy DBG_SET_FLAG_MIN("syscall", PMS); 436147191Sjkoshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 437147191Sjkoshy DBG_SET_FLAG_MIN("write", WRI); 438147191Sjkoshy if (found == 0) { 439147191Sjkoshy /* unrecognized flag name */ 440147191Sjkoshy error = EINVAL; 441147191Sjkoshy goto done; 442147191Sjkoshy } 443147191Sjkoshy 444147191Sjkoshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 445147191Sjkoshy *newbits = tmp; 446147191Sjkoshy continue; 447147191Sjkoshy } 448147191Sjkoshy 449147191Sjkoshy p++; 450147191Sjkoshy goto newflag; 451145256Sjkoshy } 452145256Sjkoshy 453147191Sjkoshy /* save the new flag set */ 454147191Sjkoshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 455145256Sjkoshy 456147191Sjkoshy done: 457184205Sdes free(tmpflags, M_PMC); 458147191Sjkoshy return error; 459145256Sjkoshy} 460145256Sjkoshy 461145256Sjkoshystatic int 462145256Sjkoshypmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 463145256Sjkoshy{ 464145256Sjkoshy char *fence, *newstr; 465145256Sjkoshy int error; 466145256Sjkoshy unsigned int n; 467145256Sjkoshy 468145256Sjkoshy (void) arg1; (void) arg2; /* unused parameters */ 469145256Sjkoshy 470145256Sjkoshy n = sizeof(pmc_debugstr); 471184802Sjkoshy newstr = malloc(n, M_PMC, M_WAITOK|M_ZERO); 472147191Sjkoshy (void) strlcpy(newstr, pmc_debugstr, n); 473145256Sjkoshy 474145256Sjkoshy error = sysctl_handle_string(oidp, newstr, n, req); 475145256Sjkoshy 476145256Sjkoshy /* if there is a new string, parse and copy it */ 477145256Sjkoshy if (error == 0 && req->newptr != NULL) { 478147191Sjkoshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 479145256Sjkoshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 480145256Sjkoshy (void) strlcpy(pmc_debugstr, newstr, 481145256Sjkoshy sizeof(pmc_debugstr)); 482145256Sjkoshy } 483145256Sjkoshy 484184205Sdes free(newstr, M_PMC); 485145256Sjkoshy 486145256Sjkoshy return error; 487145256Sjkoshy} 488145256Sjkoshy#endif 489145256Sjkoshy 490145256Sjkoshy/* 491184802Sjkoshy * Map a row index to a classdep structure and return the adjusted row 492184802Sjkoshy * index for the PMC class index. 493184802Sjkoshy */ 494184802Sjkoshystatic struct pmc_classdep * 495184802Sjkoshypmc_ri_to_classdep(struct pmc_mdep *md, int ri, int *adjri) 496184802Sjkoshy{ 497184802Sjkoshy struct pmc_classdep *pcd; 498184802Sjkoshy 499184802Sjkoshy (void) md; 500184802Sjkoshy 501184802Sjkoshy KASSERT(ri >= 0 && ri < md->pmd_npmc, 502184802Sjkoshy ("[pmc,%d] illegal row-index %d", __LINE__, ri)); 503184802Sjkoshy 504184802Sjkoshy pcd = pmc_rowindex_to_classdep[ri]; 505184802Sjkoshy 506184802Sjkoshy KASSERT(pcd != NULL, 507184802Sjkoshy ("[amd,%d] ri %d null pcd", __LINE__, ri)); 508184802Sjkoshy 509184802Sjkoshy *adjri = ri - pcd->pcd_ri; 510184802Sjkoshy 511184802Sjkoshy KASSERT(*adjri >= 0 && *adjri < pcd->pcd_num, 512184802Sjkoshy ("[pmc,%d] adjusted row-index %d", __LINE__, *adjri)); 513184802Sjkoshy 514184802Sjkoshy return (pcd); 515184802Sjkoshy} 516184802Sjkoshy 517184802Sjkoshy/* 518145256Sjkoshy * Concurrency Control 519145256Sjkoshy * 520145256Sjkoshy * The driver manages the following data structures: 521145256Sjkoshy * 522145256Sjkoshy * - target process descriptors, one per target process 523145256Sjkoshy * - owner process descriptors (and attached lists), one per owner process 524145256Sjkoshy * - lookup hash tables for owner and target processes 525145256Sjkoshy * - PMC descriptors (and attached lists) 526145256Sjkoshy * - per-cpu hardware state 527145256Sjkoshy * - the 'hook' variable through which the kernel calls into 528145256Sjkoshy * this module 529145256Sjkoshy * - the machine hardware state (managed by the MD layer) 530145256Sjkoshy * 531145256Sjkoshy * These data structures are accessed from: 532145256Sjkoshy * 533145256Sjkoshy * - thread context-switch code 534145256Sjkoshy * - interrupt handlers (possibly on multiple cpus) 535145256Sjkoshy * - kernel threads on multiple cpus running on behalf of user 536145256Sjkoshy * processes doing system calls 537145256Sjkoshy * - this driver's private kernel threads 538145256Sjkoshy * 539145256Sjkoshy * = Locks and Locking strategy = 540145256Sjkoshy * 541145256Sjkoshy * The driver uses four locking strategies for its operation: 542145256Sjkoshy * 543168856Sjkoshy * - The global SX lock "pmc_sx" is used to protect internal 544168856Sjkoshy * data structures. 545145256Sjkoshy * 546168856Sjkoshy * Calls into the module by syscall() start with this lock being 547168856Sjkoshy * held in exclusive mode. Depending on the requested operation, 548168856Sjkoshy * the lock may be downgraded to 'shared' mode to allow more 549168856Sjkoshy * concurrent readers into the module. Calls into the module from 550168856Sjkoshy * other parts of the kernel acquire the lock in shared mode. 551145256Sjkoshy * 552145256Sjkoshy * This SX lock is held in exclusive mode for any operations that 553145256Sjkoshy * modify the linkages between the driver's internal data structures. 554145256Sjkoshy * 555145256Sjkoshy * The 'pmc_hook' function pointer is also protected by this lock. 556145256Sjkoshy * It is only examined with the sx lock held in exclusive mode. The 557168856Sjkoshy * kernel module is allowed to be unloaded only with the sx lock held 558168856Sjkoshy * in exclusive mode. In normal syscall handling, after acquiring the 559168856Sjkoshy * pmc_sx lock we first check that 'pmc_hook' is non-null before 560168856Sjkoshy * proceeding. This prevents races between the thread unloading the module 561168856Sjkoshy * and other threads seeking to use the module. 562145256Sjkoshy * 563145256Sjkoshy * - Lookups of target process structures and owner process structures 564145256Sjkoshy * cannot use the global "pmc_sx" SX lock because these lookups need 565145256Sjkoshy * to happen during context switches and in other critical sections 566145256Sjkoshy * where sleeping is not allowed. We protect these lookup tables 567145256Sjkoshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 568168856Sjkoshy * "pmc_ownerhash_mtx". 569145256Sjkoshy * 570145256Sjkoshy * - Interrupt handlers work in a lock free manner. At interrupt 571145256Sjkoshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 572145256Sjkoshy * when the PMC was started. If this pointer is NULL, the interrupt 573145256Sjkoshy * is ignored after updating driver statistics. We ensure that this 574145256Sjkoshy * pointer is set (using an atomic operation if necessary) before the 575145256Sjkoshy * PMC hardware is started. Conversely, this pointer is unset atomically 576145256Sjkoshy * only after the PMC hardware is stopped. 577145256Sjkoshy * 578145256Sjkoshy * We ensure that everything needed for the operation of an 579145256Sjkoshy * interrupt handler is available without it needing to acquire any 580145256Sjkoshy * locks. We also ensure that a PMC's software state is destroyed only 581145256Sjkoshy * after the PMC is taken off hardware (on all CPUs). 582145256Sjkoshy * 583145256Sjkoshy * - Context-switch handling with process-private PMCs needs more 584145256Sjkoshy * care. 585145256Sjkoshy * 586145256Sjkoshy * A given process may be the target of multiple PMCs. For example, 587145256Sjkoshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 588145256Sjkoshy * while the target process is running on another. A PMC could also 589145256Sjkoshy * be getting released because its owner is exiting. We tackle 590145256Sjkoshy * these situations in the following manner: 591145256Sjkoshy * 592145256Sjkoshy * - each target process structure 'pmc_process' has an array 593145256Sjkoshy * of 'struct pmc *' pointers, one for each hardware PMC. 594145256Sjkoshy * 595145256Sjkoshy * - At context switch IN time, each "target" PMC in RUNNING state 596145256Sjkoshy * gets started on hardware and a pointer to each PMC is copied into 597145256Sjkoshy * the per-cpu phw array. The 'runcount' for the PMC is 598145256Sjkoshy * incremented. 599145256Sjkoshy * 600145256Sjkoshy * - At context switch OUT time, all process-virtual PMCs are stopped 601145256Sjkoshy * on hardware. The saved value is added to the PMCs value field 602145256Sjkoshy * only if the PMC is in a non-deleted state (the PMCs state could 603145256Sjkoshy * have changed during the current time slice). 604145256Sjkoshy * 605145256Sjkoshy * Note that since in-between a switch IN on a processor and a switch 606145256Sjkoshy * OUT, the PMC could have been released on another CPU. Therefore 607145256Sjkoshy * context switch OUT always looks at the hardware state to turn 608145256Sjkoshy * OFF PMCs and will update a PMC's saved value only if reachable 609145256Sjkoshy * from the target process record. 610145256Sjkoshy * 611145256Sjkoshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 612145256Sjkoshy * be attached to many processes at the time of the call and could 613145256Sjkoshy * be active on multiple CPUs). 614145256Sjkoshy * 615145256Sjkoshy * We prevent further scheduling of the PMC by marking it as in 616145256Sjkoshy * state 'DELETED'. If the runcount of the PMC is non-zero then 617145256Sjkoshy * this PMC is currently running on a CPU somewhere. The thread 618167086Sjhb * doing the PMCRELEASE operation waits by repeatedly doing a 619167086Sjhb * pause() till the runcount comes to zero. 620145256Sjkoshy * 621168856Sjkoshy * The contents of a PMC descriptor (struct pmc) are protected using 622168856Sjkoshy * a spin-mutex. In order to save space, we use a mutex pool. 623168856Sjkoshy * 624168856Sjkoshy * In terms of lock types used by witness(4), we use: 625168856Sjkoshy * - Type "pmc-sx", used by the global SX lock. 626168856Sjkoshy * - Type "pmc-sleep", for sleep mutexes used by logger threads. 627168856Sjkoshy * - Type "pmc-per-proc", for protecting PMC owner descriptors. 628168856Sjkoshy * - Type "pmc-leaf", used for all other spin mutexes. 629145256Sjkoshy */ 630145256Sjkoshy 631145256Sjkoshy/* 632145256Sjkoshy * save the cpu binding of the current kthread 633145256Sjkoshy */ 634145256Sjkoshy 635145256Sjkoshystatic void 636145256Sjkoshypmc_save_cpu_binding(struct pmc_binding *pb) 637145256Sjkoshy{ 638145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "save-cpu"); 639170307Sjeff thread_lock(curthread); 640145256Sjkoshy pb->pb_bound = sched_is_bound(curthread); 641145256Sjkoshy pb->pb_cpu = curthread->td_oncpu; 642170307Sjeff thread_unlock(curthread); 643145256Sjkoshy PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 644145256Sjkoshy} 645145256Sjkoshy 646145256Sjkoshy/* 647145256Sjkoshy * restore the cpu binding of the current thread 648145256Sjkoshy */ 649145256Sjkoshy 650145256Sjkoshystatic void 651145256Sjkoshypmc_restore_cpu_binding(struct pmc_binding *pb) 652145256Sjkoshy{ 653145256Sjkoshy PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 654145256Sjkoshy curthread->td_oncpu, pb->pb_cpu); 655170307Sjeff thread_lock(curthread); 656145256Sjkoshy if (pb->pb_bound) 657145256Sjkoshy sched_bind(curthread, pb->pb_cpu); 658145256Sjkoshy else 659145256Sjkoshy sched_unbind(curthread); 660170307Sjeff thread_unlock(curthread); 661145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "restore-cpu done"); 662145256Sjkoshy} 663145256Sjkoshy 664145256Sjkoshy/* 665145256Sjkoshy * move execution over the specified cpu and bind it there. 666145256Sjkoshy */ 667145256Sjkoshy 668145256Sjkoshystatic void 669145256Sjkoshypmc_select_cpu(int cpu) 670145256Sjkoshy{ 671183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 672145256Sjkoshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 673145256Sjkoshy 674183266Sjkoshy /* Never move to an inactive CPU. */ 675183266Sjkoshy KASSERT(pmc_cpu_is_active(cpu), ("[pmc,%d] selecting inactive " 676183266Sjkoshy "CPU %d", __LINE__, cpu)); 677145256Sjkoshy 678145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu); 679170307Sjeff thread_lock(curthread); 680145256Sjkoshy sched_bind(curthread, cpu); 681170307Sjeff thread_unlock(curthread); 682145256Sjkoshy 683145256Sjkoshy KASSERT(curthread->td_oncpu == cpu, 684145256Sjkoshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 685145256Sjkoshy cpu, curthread->td_oncpu)); 686145256Sjkoshy 687145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 688145256Sjkoshy} 689145256Sjkoshy 690145256Sjkoshy/* 691145774Sjkoshy * Force a context switch. 692145774Sjkoshy * 693167086Sjhb * We do this by pause'ing for 1 tick -- invoking mi_switch() is not 694145774Sjkoshy * guaranteed to force a context switch. 695145774Sjkoshy */ 696145774Sjkoshy 697145774Sjkoshystatic void 698145774Sjkoshypmc_force_context_switch(void) 699145774Sjkoshy{ 700145774Sjkoshy 701167086Sjhb pause("pmcctx", 1); 702145774Sjkoshy} 703145774Sjkoshy 704145774Sjkoshy/* 705147191Sjkoshy * Get the file name for an executable. This is a simple wrapper 706147191Sjkoshy * around vn_fullpath(9). 707145256Sjkoshy */ 708145256Sjkoshy 709147191Sjkoshystatic void 710147708Sjkoshypmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 711145256Sjkoshy{ 712145256Sjkoshy 713147191Sjkoshy *fullpath = "unknown"; 714147191Sjkoshy *freepath = NULL; 715175294Sattilio vn_fullpath(curthread, v, fullpath, freepath); 716145256Sjkoshy} 717145256Sjkoshy 718145256Sjkoshy/* 719145256Sjkoshy * remove an process owning PMCs 720145256Sjkoshy */ 721145256Sjkoshy 722145256Sjkoshyvoid 723145256Sjkoshypmc_remove_owner(struct pmc_owner *po) 724145256Sjkoshy{ 725147191Sjkoshy struct pmc *pm, *tmp; 726145256Sjkoshy 727145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 728145256Sjkoshy 729145256Sjkoshy PMCDBG(OWN,ORM,1, "remove-owner po=%p", po); 730145256Sjkoshy 731145256Sjkoshy /* Remove descriptor from the owner hash table */ 732145256Sjkoshy LIST_REMOVE(po, po_next); 733145256Sjkoshy 734147191Sjkoshy /* release all owned PMC descriptors */ 735147191Sjkoshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 736147191Sjkoshy PMCDBG(OWN,ORM,2, "pmc=%p", pm); 737147191Sjkoshy KASSERT(pm->pm_owner == po, 738147191Sjkoshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 739145256Sjkoshy 740147191Sjkoshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 741145256Sjkoshy } 742145256Sjkoshy 743147191Sjkoshy KASSERT(po->po_sscount == 0, 744147191Sjkoshy ("[pmc,%d] SS count not zero", __LINE__)); 745145256Sjkoshy KASSERT(LIST_EMPTY(&po->po_pmcs), 746147191Sjkoshy ("[pmc,%d] PMC list not empty", __LINE__)); 747145256Sjkoshy 748147191Sjkoshy /* de-configure the log file if present */ 749145774Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 750147191Sjkoshy pmclog_deconfigure_log(po); 751145256Sjkoshy} 752145256Sjkoshy 753145256Sjkoshy/* 754145256Sjkoshy * remove an owner process record if all conditions are met. 755145256Sjkoshy */ 756145256Sjkoshy 757145256Sjkoshystatic void 758145256Sjkoshypmc_maybe_remove_owner(struct pmc_owner *po) 759145256Sjkoshy{ 760145256Sjkoshy 761145256Sjkoshy PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po); 762145256Sjkoshy 763145256Sjkoshy /* 764145256Sjkoshy * Remove owner record if 765145256Sjkoshy * - this process does not own any PMCs 766145256Sjkoshy * - this process has not allocated a system-wide sampling buffer 767145256Sjkoshy */ 768145256Sjkoshy 769145256Sjkoshy if (LIST_EMPTY(&po->po_pmcs) && 770145774Sjkoshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 771145256Sjkoshy pmc_remove_owner(po); 772147191Sjkoshy pmc_destroy_owner_descriptor(po); 773145256Sjkoshy } 774145256Sjkoshy} 775145256Sjkoshy 776145256Sjkoshy/* 777145256Sjkoshy * Add an association between a target process and a PMC. 778145256Sjkoshy */ 779145256Sjkoshy 780145256Sjkoshystatic void 781145256Sjkoshypmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 782145256Sjkoshy{ 783145256Sjkoshy int ri; 784145256Sjkoshy struct pmc_target *pt; 785145256Sjkoshy 786145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 787145256Sjkoshy 788145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 789145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 790147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 791147191Sjkoshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 792147191Sjkoshy __LINE__, pm, pp->pp_proc->p_pid)); 793145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < ((int) md->pmd_npmc - 1), 794145256Sjkoshy ("[pmc,%d] Illegal reference count %d for process record %p", 795145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 796145256Sjkoshy 797145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 798145256Sjkoshy 799145256Sjkoshy PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 800145256Sjkoshy pm, ri, pp); 801145256Sjkoshy 802153110Sru#ifdef DEBUG 803145256Sjkoshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 804145256Sjkoshy if (pt->pt_process == pp) 805145256Sjkoshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 806145256Sjkoshy __LINE__, pp, pm)); 807145256Sjkoshy#endif 808145256Sjkoshy 809184802Sjkoshy pt = malloc(sizeof(struct pmc_target), M_PMC, M_WAITOK|M_ZERO); 810145256Sjkoshy pt->pt_process = pp; 811145256Sjkoshy 812145256Sjkoshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 813145256Sjkoshy 814148067Sjhb atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 815148067Sjhb (uintptr_t)pm); 816145256Sjkoshy 817145615Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) 818145774Sjkoshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 819145615Sjkoshy 820147191Sjkoshy /* 821147191Sjkoshy * Initialize the per-process values at this row index. 822147191Sjkoshy */ 823147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 824147191Sjkoshy pm->pm_sc.pm_reloadcount : 0; 825147191Sjkoshy 826145256Sjkoshy pp->pp_refcnt++; 827145256Sjkoshy 828145256Sjkoshy} 829145256Sjkoshy 830145256Sjkoshy/* 831145256Sjkoshy * Removes the association between a target process and a PMC. 832145256Sjkoshy */ 833145256Sjkoshy 834145256Sjkoshystatic void 835145256Sjkoshypmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 836145256Sjkoshy{ 837145256Sjkoshy int ri; 838147191Sjkoshy struct proc *p; 839145256Sjkoshy struct pmc_target *ptgt; 840145256Sjkoshy 841145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 842145256Sjkoshy 843145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 844145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 845145256Sjkoshy 846145256Sjkoshy KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt < (int) md->pmd_npmc, 847145256Sjkoshy ("[pmc,%d] Illegal ref count %d on process record %p", 848145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 849145256Sjkoshy 850145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 851145256Sjkoshy 852145256Sjkoshy PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 853145256Sjkoshy pm, ri, pp); 854145256Sjkoshy 855145256Sjkoshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 856145256Sjkoshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 857145256Sjkoshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 858145256Sjkoshy 859145256Sjkoshy pp->pp_pmcs[ri].pp_pmc = NULL; 860145256Sjkoshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 861145256Sjkoshy 862145774Sjkoshy /* Remove owner-specific flags */ 863145774Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) { 864145774Sjkoshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 865145774Sjkoshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 866145774Sjkoshy } 867145615Sjkoshy 868145256Sjkoshy pp->pp_refcnt--; 869145256Sjkoshy 870145256Sjkoshy /* Remove the target process from the PMC structure */ 871145256Sjkoshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 872145256Sjkoshy if (ptgt->pt_process == pp) 873145256Sjkoshy break; 874145256Sjkoshy 875145256Sjkoshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 876145256Sjkoshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 877145256Sjkoshy 878145256Sjkoshy LIST_REMOVE(ptgt, pt_next); 879184205Sdes free(ptgt, M_PMC); 880145256Sjkoshy 881147191Sjkoshy /* if the PMC now lacks targets, send the owner a SIGIO */ 882147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) { 883147191Sjkoshy p = pm->pm_owner->po_owner; 884147191Sjkoshy PROC_LOCK(p); 885147191Sjkoshy psignal(p, SIGIO); 886147191Sjkoshy PROC_UNLOCK(p); 887145256Sjkoshy 888147191Sjkoshy PMCDBG(PRC,SIG,2, "signalling proc=%p signal=%d", p, 889147191Sjkoshy SIGIO); 890145256Sjkoshy } 891145256Sjkoshy} 892145256Sjkoshy 893145256Sjkoshy/* 894145256Sjkoshy * Check if PMC 'pm' may be attached to target process 't'. 895145256Sjkoshy */ 896145256Sjkoshy 897145256Sjkoshystatic int 898145256Sjkoshypmc_can_attach(struct pmc *pm, struct proc *t) 899145256Sjkoshy{ 900145256Sjkoshy struct proc *o; /* pmc owner */ 901145256Sjkoshy struct ucred *oc, *tc; /* owner, target credentials */ 902145256Sjkoshy int decline_attach, i; 903145256Sjkoshy 904145256Sjkoshy /* 905145256Sjkoshy * A PMC's owner can always attach that PMC to itself. 906145256Sjkoshy */ 907145256Sjkoshy 908145256Sjkoshy if ((o = pm->pm_owner->po_owner) == t) 909145256Sjkoshy return 0; 910145256Sjkoshy 911145256Sjkoshy PROC_LOCK(o); 912145256Sjkoshy oc = o->p_ucred; 913145256Sjkoshy crhold(oc); 914145256Sjkoshy PROC_UNLOCK(o); 915145256Sjkoshy 916145256Sjkoshy PROC_LOCK(t); 917145256Sjkoshy tc = t->p_ucred; 918145256Sjkoshy crhold(tc); 919145256Sjkoshy PROC_UNLOCK(t); 920145256Sjkoshy 921145256Sjkoshy /* 922145256Sjkoshy * The effective uid of the PMC owner should match at least one 923145256Sjkoshy * of the {effective,real,saved} uids of the target process. 924145256Sjkoshy */ 925145256Sjkoshy 926145256Sjkoshy decline_attach = oc->cr_uid != tc->cr_uid && 927145256Sjkoshy oc->cr_uid != tc->cr_svuid && 928145256Sjkoshy oc->cr_uid != tc->cr_ruid; 929145256Sjkoshy 930145256Sjkoshy /* 931145256Sjkoshy * Every one of the target's group ids, must be in the owner's 932145256Sjkoshy * group list. 933145256Sjkoshy */ 934145256Sjkoshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 935145256Sjkoshy decline_attach = !groupmember(tc->cr_groups[i], oc); 936145256Sjkoshy 937145256Sjkoshy /* check the read and saved gids too */ 938145256Sjkoshy if (decline_attach == 0) 939145256Sjkoshy decline_attach = !groupmember(tc->cr_rgid, oc) || 940145256Sjkoshy !groupmember(tc->cr_svgid, oc); 941145256Sjkoshy 942145256Sjkoshy crfree(tc); 943145256Sjkoshy crfree(oc); 944145256Sjkoshy 945145256Sjkoshy return !decline_attach; 946145256Sjkoshy} 947145256Sjkoshy 948145256Sjkoshy/* 949145256Sjkoshy * Attach a process to a PMC. 950145256Sjkoshy */ 951145256Sjkoshy 952145256Sjkoshystatic int 953145256Sjkoshypmc_attach_one_process(struct proc *p, struct pmc *pm) 954145256Sjkoshy{ 955145256Sjkoshy int ri; 956147191Sjkoshy char *fullpath, *freepath; 957145256Sjkoshy struct pmc_process *pp; 958145256Sjkoshy 959145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 960145256Sjkoshy 961145256Sjkoshy PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 962145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 963145256Sjkoshy 964145256Sjkoshy /* 965145256Sjkoshy * Locate the process descriptor corresponding to process 'p', 966145256Sjkoshy * allocating space as needed. 967145256Sjkoshy * 968145256Sjkoshy * Verify that rowindex 'pm_rowindex' is free in the process 969145256Sjkoshy * descriptor. 970145256Sjkoshy * 971145256Sjkoshy * If not, allocate space for a descriptor and link the 972145256Sjkoshy * process descriptor and PMC. 973145256Sjkoshy */ 974145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 975145256Sjkoshy 976145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 977145256Sjkoshy return ENOMEM; 978145256Sjkoshy 979145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 980145256Sjkoshy return EEXIST; 981145256Sjkoshy 982145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 983145256Sjkoshy return EBUSY; 984145256Sjkoshy 985145256Sjkoshy pmc_link_target_process(pm, pp); 986145256Sjkoshy 987147191Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 988147191Sjkoshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 989147191Sjkoshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 990147191Sjkoshy 991147191Sjkoshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 992147191Sjkoshy 993147191Sjkoshy /* issue an attach event to a configured log file */ 994147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 995147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 996180794Sjeff if (p->p_flag & P_KTHREAD) { 997180794Sjeff fullpath = kernelname; 998180794Sjeff freepath = NULL; 999180794Sjeff } else 1000180794Sjeff pmclog_process_pmcattach(pm, p->p_pid, fullpath); 1001147191Sjkoshy if (freepath) 1002184205Sdes free(freepath, M_TEMP); 1003174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1004174395Sjkoshy pmc_log_process_mappings(pm->pm_owner, p); 1005147191Sjkoshy } 1006145256Sjkoshy /* mark process as using HWPMCs */ 1007145256Sjkoshy PROC_LOCK(p); 1008145256Sjkoshy p->p_flag |= P_HWPMC; 1009145256Sjkoshy PROC_UNLOCK(p); 1010145256Sjkoshy 1011145256Sjkoshy return 0; 1012145256Sjkoshy} 1013145256Sjkoshy 1014145256Sjkoshy/* 1015145256Sjkoshy * Attach a process and optionally its children 1016145256Sjkoshy */ 1017145256Sjkoshy 1018145256Sjkoshystatic int 1019145256Sjkoshypmc_attach_process(struct proc *p, struct pmc *pm) 1020145256Sjkoshy{ 1021145256Sjkoshy int error; 1022145256Sjkoshy struct proc *top; 1023145256Sjkoshy 1024145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1025145256Sjkoshy 1026145256Sjkoshy PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 1027145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1028145256Sjkoshy 1029145774Sjkoshy 1030145774Sjkoshy /* 1031145774Sjkoshy * If this PMC successfully allowed a GETMSR operation 1032145774Sjkoshy * in the past, disallow further ATTACHes. 1033145774Sjkoshy */ 1034145774Sjkoshy 1035145774Sjkoshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 1036145774Sjkoshy return EPERM; 1037145774Sjkoshy 1038145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1039145256Sjkoshy return pmc_attach_one_process(p, pm); 1040145256Sjkoshy 1041145256Sjkoshy /* 1042145256Sjkoshy * Traverse all child processes, attaching them to 1043145256Sjkoshy * this PMC. 1044145256Sjkoshy */ 1045145256Sjkoshy 1046145256Sjkoshy sx_slock(&proctree_lock); 1047145256Sjkoshy 1048145256Sjkoshy top = p; 1049145256Sjkoshy 1050145256Sjkoshy for (;;) { 1051145256Sjkoshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1052145256Sjkoshy break; 1053145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1054145256Sjkoshy p = LIST_FIRST(&p->p_children); 1055145256Sjkoshy else for (;;) { 1056145256Sjkoshy if (p == top) 1057145256Sjkoshy goto done; 1058145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1059145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1060145256Sjkoshy break; 1061145256Sjkoshy } 1062145256Sjkoshy p = p->p_pptr; 1063145256Sjkoshy } 1064145256Sjkoshy } 1065145256Sjkoshy 1066145256Sjkoshy if (error) 1067145256Sjkoshy (void) pmc_detach_process(top, pm); 1068145256Sjkoshy 1069145256Sjkoshy done: 1070145256Sjkoshy sx_sunlock(&proctree_lock); 1071145256Sjkoshy return error; 1072145256Sjkoshy} 1073145256Sjkoshy 1074145256Sjkoshy/* 1075145256Sjkoshy * Detach a process from a PMC. If there are no other PMCs tracking 1076145256Sjkoshy * this process, remove the process structure from its hash table. If 1077145256Sjkoshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1078145256Sjkoshy */ 1079145256Sjkoshy 1080145256Sjkoshystatic int 1081145256Sjkoshypmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1082145256Sjkoshy{ 1083145256Sjkoshy int ri; 1084145256Sjkoshy struct pmc_process *pp; 1085145256Sjkoshy 1086145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1087145256Sjkoshy 1088145256Sjkoshy KASSERT(pm != NULL, 1089145256Sjkoshy ("[pmc,%d] null pm pointer", __LINE__)); 1090145256Sjkoshy 1091145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1092145774Sjkoshy 1093145256Sjkoshy PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1094145774Sjkoshy pm, ri, p, p->p_pid, p->p_comm, flags); 1095145256Sjkoshy 1096145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1097145256Sjkoshy return ESRCH; 1098145256Sjkoshy 1099145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1100145256Sjkoshy return EINVAL; 1101145256Sjkoshy 1102145256Sjkoshy pmc_unlink_target_process(pm, pp); 1103145256Sjkoshy 1104147191Sjkoshy /* Issue a detach entry if a log file is configured */ 1105147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1106147191Sjkoshy pmclog_process_pmcdetach(pm, p->p_pid); 1107147191Sjkoshy 1108145256Sjkoshy /* 1109145256Sjkoshy * If there are no PMCs targetting this process, we remove its 1110145256Sjkoshy * descriptor from the target hash table and unset the P_HWPMC 1111145256Sjkoshy * flag in the struct proc. 1112145256Sjkoshy */ 1113145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1114145256Sjkoshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1115145256Sjkoshy __LINE__, pp->pp_refcnt, pp)); 1116145256Sjkoshy 1117145256Sjkoshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1118145256Sjkoshy return 0; 1119145256Sjkoshy 1120145256Sjkoshy pmc_remove_process_descriptor(pp); 1121145256Sjkoshy 1122145256Sjkoshy if (flags & PMC_FLAG_REMOVE) 1123184205Sdes free(pp, M_PMC); 1124145256Sjkoshy 1125145256Sjkoshy PROC_LOCK(p); 1126145256Sjkoshy p->p_flag &= ~P_HWPMC; 1127145256Sjkoshy PROC_UNLOCK(p); 1128145256Sjkoshy 1129145256Sjkoshy return 0; 1130145256Sjkoshy} 1131145256Sjkoshy 1132145256Sjkoshy/* 1133145256Sjkoshy * Detach a process and optionally its descendants from a PMC. 1134145256Sjkoshy */ 1135145256Sjkoshy 1136145256Sjkoshystatic int 1137145256Sjkoshypmc_detach_process(struct proc *p, struct pmc *pm) 1138145256Sjkoshy{ 1139145256Sjkoshy struct proc *top; 1140145256Sjkoshy 1141145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1142145256Sjkoshy 1143145256Sjkoshy PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1144145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1145145256Sjkoshy 1146145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1147145256Sjkoshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1148145256Sjkoshy 1149145256Sjkoshy /* 1150145256Sjkoshy * Traverse all children, detaching them from this PMC. We 1151145256Sjkoshy * ignore errors since we could be detaching a PMC from a 1152145256Sjkoshy * partially attached proc tree. 1153145256Sjkoshy */ 1154145256Sjkoshy 1155145256Sjkoshy sx_slock(&proctree_lock); 1156145256Sjkoshy 1157145256Sjkoshy top = p; 1158145256Sjkoshy 1159145256Sjkoshy for (;;) { 1160145256Sjkoshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1161145256Sjkoshy 1162145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1163145256Sjkoshy p = LIST_FIRST(&p->p_children); 1164145256Sjkoshy else for (;;) { 1165145256Sjkoshy if (p == top) 1166145256Sjkoshy goto done; 1167145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1168145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1169145256Sjkoshy break; 1170145256Sjkoshy } 1171145256Sjkoshy p = p->p_pptr; 1172145256Sjkoshy } 1173145256Sjkoshy } 1174145256Sjkoshy 1175145256Sjkoshy done: 1176145256Sjkoshy sx_sunlock(&proctree_lock); 1177147191Sjkoshy 1178147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 1179147191Sjkoshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1180147191Sjkoshy 1181145256Sjkoshy return 0; 1182145256Sjkoshy} 1183145256Sjkoshy 1184147191Sjkoshy 1185145256Sjkoshy/* 1186147191Sjkoshy * Thread context switch IN 1187145256Sjkoshy */ 1188145256Sjkoshy 1189147191Sjkoshystatic void 1190147191Sjkoshypmc_process_csw_in(struct thread *td) 1191147191Sjkoshy{ 1192147191Sjkoshy int cpu; 1193184802Sjkoshy unsigned int adjri, ri; 1194147191Sjkoshy struct pmc *pm; 1195147191Sjkoshy struct proc *p; 1196147191Sjkoshy struct pmc_cpu *pc; 1197147191Sjkoshy struct pmc_hw *phw; 1198184802Sjkoshy pmc_value_t newvalue; 1199147191Sjkoshy struct pmc_process *pp; 1200184802Sjkoshy struct pmc_classdep *pcd; 1201145256Sjkoshy 1202147191Sjkoshy p = td->td_proc; 1203145256Sjkoshy 1204147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1205147191Sjkoshy return; 1206145256Sjkoshy 1207147191Sjkoshy KASSERT(pp->pp_proc == td->td_proc, 1208147191Sjkoshy ("[pmc,%d] not my thread state", __LINE__)); 1209145256Sjkoshy 1210147191Sjkoshy critical_enter(); /* no preemption from this point */ 1211145256Sjkoshy 1212147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1213145256Sjkoshy 1214147191Sjkoshy PMCDBG(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1215147191Sjkoshy p->p_pid, p->p_comm, pp); 1216145256Sjkoshy 1217183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1218147191Sjkoshy ("[pmc,%d] wierd CPU id %d", __LINE__, cpu)); 1219145256Sjkoshy 1220147191Sjkoshy pc = pmc_pcpu[cpu]; 1221145256Sjkoshy 1222147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1223145256Sjkoshy 1224147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1225147191Sjkoshy continue; 1226147191Sjkoshy 1227147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1228147191Sjkoshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1229147191Sjkoshy __LINE__, PMC_TO_MODE(pm))); 1230147191Sjkoshy 1231147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1232147191Sjkoshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1233147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1234147191Sjkoshy 1235145256Sjkoshy /* 1236147191Sjkoshy * Only PMCs that are marked as 'RUNNING' need 1237147191Sjkoshy * be placed on hardware. 1238145256Sjkoshy */ 1239145256Sjkoshy 1240147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 1241147191Sjkoshy continue; 1242145256Sjkoshy 1243147191Sjkoshy /* increment PMC runcount */ 1244147191Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); 1245145256Sjkoshy 1246147191Sjkoshy /* configure the HWPMC we are going to use. */ 1247184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1248184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, pm); 1249145256Sjkoshy 1250147191Sjkoshy phw = pc->pc_hwpmcs[ri]; 1251145256Sjkoshy 1252147191Sjkoshy KASSERT(phw != NULL, 1253147191Sjkoshy ("[pmc,%d] null hw pointer", __LINE__)); 1254145256Sjkoshy 1255147191Sjkoshy KASSERT(phw->phw_pmc == pm, 1256147191Sjkoshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1257147191Sjkoshy phw->phw_pmc, pm)); 1258145256Sjkoshy 1259147191Sjkoshy /* 1260147191Sjkoshy * Write out saved value and start the PMC. 1261147191Sjkoshy * 1262147191Sjkoshy * Sampling PMCs use a per-process value, while 1263147191Sjkoshy * counting mode PMCs use a per-pmc value that is 1264147191Sjkoshy * inherited across descendants. 1265147191Sjkoshy */ 1266147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1267147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1268147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1269147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval; 1270147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1271147191Sjkoshy } else { 1272147191Sjkoshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1273147191Sjkoshy ("[pmc,%d] illegal mode=%d", __LINE__, 1274147191Sjkoshy PMC_TO_MODE(pm))); 1275147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1276147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1277147191Sjkoshy pm->pm_gv.pm_savedvalue; 1278147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1279147191Sjkoshy } 1280145256Sjkoshy 1281147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1282145256Sjkoshy 1283184802Sjkoshy pcd->pcd_write_pmc(cpu, adjri, newvalue); 1284184802Sjkoshy pcd->pcd_start_pmc(cpu, adjri); 1285147191Sjkoshy } 1286145256Sjkoshy 1287147191Sjkoshy /* 1288147191Sjkoshy * perform any other architecture/cpu dependent thread 1289147191Sjkoshy * switch-in actions. 1290147191Sjkoshy */ 1291145256Sjkoshy 1292147191Sjkoshy (void) (*md->pmd_switch_in)(pc, pp); 1293145256Sjkoshy 1294147191Sjkoshy critical_exit(); 1295145256Sjkoshy 1296147191Sjkoshy} 1297145256Sjkoshy 1298147191Sjkoshy/* 1299147191Sjkoshy * Thread context switch OUT. 1300147191Sjkoshy */ 1301145256Sjkoshy 1302147191Sjkoshystatic void 1303147191Sjkoshypmc_process_csw_out(struct thread *td) 1304147191Sjkoshy{ 1305147191Sjkoshy int cpu; 1306184802Sjkoshy int64_t tmp; 1307147191Sjkoshy struct pmc *pm; 1308147191Sjkoshy struct proc *p; 1309184802Sjkoshy enum pmc_mode mode; 1310147191Sjkoshy struct pmc_cpu *pc; 1311184802Sjkoshy pmc_value_t newvalue; 1312184802Sjkoshy unsigned int adjri, ri; 1313147191Sjkoshy struct pmc_process *pp; 1314184802Sjkoshy struct pmc_classdep *pcd; 1315145256Sjkoshy 1316184802Sjkoshy 1317147191Sjkoshy /* 1318147191Sjkoshy * Locate our process descriptor; this may be NULL if 1319147191Sjkoshy * this process is exiting and we have already removed 1320147191Sjkoshy * the process from the target process table. 1321147191Sjkoshy * 1322147191Sjkoshy * Note that due to kernel preemption, multiple 1323147191Sjkoshy * context switches may happen while the process is 1324147191Sjkoshy * exiting. 1325147191Sjkoshy * 1326147191Sjkoshy * Note also that if the target process cannot be 1327147191Sjkoshy * found we still need to deconfigure any PMCs that 1328147191Sjkoshy * are currently running on hardware. 1329147191Sjkoshy */ 1330145256Sjkoshy 1331147191Sjkoshy p = td->td_proc; 1332147191Sjkoshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1333145256Sjkoshy 1334147191Sjkoshy /* 1335147191Sjkoshy * save PMCs 1336147191Sjkoshy */ 1337145256Sjkoshy 1338147191Sjkoshy critical_enter(); 1339145774Sjkoshy 1340147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1341145256Sjkoshy 1342147191Sjkoshy PMCDBG(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1343147191Sjkoshy p->p_pid, p->p_comm, pp); 1344145615Sjkoshy 1345183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1346147191Sjkoshy ("[pmc,%d wierd CPU id %d", __LINE__, cpu)); 1347145615Sjkoshy 1348147191Sjkoshy pc = pmc_pcpu[cpu]; 1349145615Sjkoshy 1350147191Sjkoshy /* 1351147191Sjkoshy * When a PMC gets unlinked from a target PMC, it will 1352147191Sjkoshy * be removed from the target's pp_pmc[] array. 1353147191Sjkoshy * 1354147191Sjkoshy * However, on a MP system, the target could have been 1355147191Sjkoshy * executing on another CPU at the time of the unlink. 1356147191Sjkoshy * So, at context switch OUT time, we need to look at 1357147191Sjkoshy * the hardware to determine if a PMC is scheduled on 1358147191Sjkoshy * it. 1359147191Sjkoshy */ 1360145256Sjkoshy 1361147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1362145256Sjkoshy 1363184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1364184802Sjkoshy pm = NULL; 1365184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 1366145256Sjkoshy 1367147191Sjkoshy if (pm == NULL) /* nothing at this row index */ 1368147191Sjkoshy continue; 1369145256Sjkoshy 1370147191Sjkoshy mode = PMC_TO_MODE(pm); 1371147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1372147191Sjkoshy continue; /* not a process virtual PMC */ 1373145774Sjkoshy 1374147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1375147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1376147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1377145256Sjkoshy 1378147191Sjkoshy /* Stop hardware if not already stopped */ 1379147867Sjkoshy if (pm->pm_stalled == 0) 1380184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 1381147191Sjkoshy 1382147191Sjkoshy /* reduce this PMC's runcount */ 1383147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 1384147191Sjkoshy 1385145256Sjkoshy /* 1386147191Sjkoshy * If this PMC is associated with this process, 1387147191Sjkoshy * save the reading. 1388145256Sjkoshy */ 1389145256Sjkoshy 1390147191Sjkoshy if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) { 1391147191Sjkoshy 1392147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1393147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1394147191Sjkoshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1395147191Sjkoshy 1396147191Sjkoshy KASSERT(pp->pp_refcnt > 0, 1397147191Sjkoshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1398147191Sjkoshy pp->pp_refcnt)); 1399147191Sjkoshy 1400184802Sjkoshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 1401147191Sjkoshy 1402147191Sjkoshy tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1403147191Sjkoshy 1404147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d tmp=%jd", cpu, ri, 1405147191Sjkoshy tmp); 1406147191Sjkoshy 1407147191Sjkoshy if (mode == PMC_MODE_TS) { 1408147191Sjkoshy 1409147191Sjkoshy /* 1410147191Sjkoshy * For sampling process-virtual PMCs, 1411147191Sjkoshy * we expect the count to be 1412147191Sjkoshy * decreasing as the 'value' 1413147191Sjkoshy * programmed into the PMC is the 1414147191Sjkoshy * number of events to be seen till 1415147191Sjkoshy * the next sampling interrupt. 1416147191Sjkoshy */ 1417147191Sjkoshy if (tmp < 0) 1418147191Sjkoshy tmp += pm->pm_sc.pm_reloadcount; 1419147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1420147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval -= tmp; 1421147191Sjkoshy if ((int64_t) pp->pp_pmcs[ri].pp_pmcval < 0) 1422147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += 1423147191Sjkoshy pm->pm_sc.pm_reloadcount; 1424147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1425147191Sjkoshy 1426147191Sjkoshy } else { 1427147191Sjkoshy 1428147191Sjkoshy /* 1429147191Sjkoshy * For counting process-virtual PMCs, 1430147191Sjkoshy * we expect the count to be 1431147191Sjkoshy * increasing monotonically, modulo a 64 1432147191Sjkoshy * bit wraparound. 1433147191Sjkoshy */ 1434147191Sjkoshy KASSERT((int64_t) tmp >= 0, 1435147191Sjkoshy ("[pmc,%d] negative increment cpu=%d " 1436147191Sjkoshy "ri=%d newvalue=%jx saved=%jx " 1437147191Sjkoshy "incr=%jx", __LINE__, cpu, ri, 1438147191Sjkoshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1439147191Sjkoshy 1440147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1441147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 1442147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1443147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1444147191Sjkoshy 1445147191Sjkoshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1446147191Sjkoshy pmclog_process_proccsw(pm, pp, tmp); 1447147191Sjkoshy } 1448145256Sjkoshy } 1449145256Sjkoshy 1450147191Sjkoshy /* mark hardware as free */ 1451184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 1452145256Sjkoshy } 1453145256Sjkoshy 1454145256Sjkoshy /* 1455147191Sjkoshy * perform any other architecture/cpu dependent thread 1456147191Sjkoshy * switch out functions. 1457147191Sjkoshy */ 1458147191Sjkoshy 1459147191Sjkoshy (void) (*md->pmd_switch_out)(pc, pp); 1460147191Sjkoshy 1461147191Sjkoshy critical_exit(); 1462147191Sjkoshy} 1463147191Sjkoshy 1464147191Sjkoshy/* 1465157144Sjkoshy * Log a KLD operation. 1466157144Sjkoshy */ 1467157144Sjkoshy 1468157144Sjkoshystatic void 1469157144Sjkoshypmc_process_kld_load(struct pmckern_map_in *pkm) 1470157144Sjkoshy{ 1471157144Sjkoshy struct pmc_owner *po; 1472157144Sjkoshy 1473157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1474157144Sjkoshy 1475157144Sjkoshy /* 1476157144Sjkoshy * Notify owners of system sampling PMCs about KLD operations. 1477157144Sjkoshy */ 1478157144Sjkoshy 1479157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1480157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1481157144Sjkoshy pmclog_process_map_in(po, (pid_t) -1, pkm->pm_address, 1482157144Sjkoshy (char *) pkm->pm_file); 1483157144Sjkoshy 1484157144Sjkoshy /* 1485157144Sjkoshy * TODO: Notify owners of (all) process-sampling PMCs too. 1486157144Sjkoshy */ 1487157144Sjkoshy 1488157144Sjkoshy return; 1489157144Sjkoshy} 1490157144Sjkoshy 1491157144Sjkoshystatic void 1492157144Sjkoshypmc_process_kld_unload(struct pmckern_map_out *pkm) 1493157144Sjkoshy{ 1494157144Sjkoshy struct pmc_owner *po; 1495157144Sjkoshy 1496157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1497157144Sjkoshy 1498157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1499157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1500157144Sjkoshy pmclog_process_map_out(po, (pid_t) -1, 1501157144Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1502174395Sjkoshy 1503157144Sjkoshy /* 1504157144Sjkoshy * TODO: Notify owners of process-sampling PMCs. 1505157144Sjkoshy */ 1506157144Sjkoshy} 1507157144Sjkoshy 1508157144Sjkoshy/* 1509157144Sjkoshy * A mapping change for a process. 1510157144Sjkoshy */ 1511157144Sjkoshy 1512157144Sjkoshystatic void 1513157144Sjkoshypmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm) 1514157144Sjkoshy{ 1515157144Sjkoshy int ri; 1516157144Sjkoshy pid_t pid; 1517157144Sjkoshy char *fullpath, *freepath; 1518157144Sjkoshy const struct pmc *pm; 1519157144Sjkoshy struct pmc_owner *po; 1520157144Sjkoshy const struct pmc_process *pp; 1521157144Sjkoshy 1522157144Sjkoshy freepath = fullpath = NULL; 1523157144Sjkoshy pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath); 1524157144Sjkoshy 1525157144Sjkoshy pid = td->td_proc->p_pid; 1526157144Sjkoshy 1527157144Sjkoshy /* Inform owners of all system-wide sampling PMCs. */ 1528157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1529157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1530157144Sjkoshy pmclog_process_map_in(po, pid, pkm->pm_address, fullpath); 1531157144Sjkoshy 1532157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1533157144Sjkoshy goto done; 1534157144Sjkoshy 1535157144Sjkoshy /* 1536157144Sjkoshy * Inform sampling PMC owners tracking this process. 1537157144Sjkoshy */ 1538157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1539157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1540157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1541157144Sjkoshy pmclog_process_map_in(pm->pm_owner, 1542157144Sjkoshy pid, pkm->pm_address, fullpath); 1543157144Sjkoshy 1544157144Sjkoshy done: 1545157144Sjkoshy if (freepath) 1546184205Sdes free(freepath, M_TEMP); 1547157144Sjkoshy} 1548157144Sjkoshy 1549157144Sjkoshy 1550157144Sjkoshy/* 1551157144Sjkoshy * Log an munmap request. 1552157144Sjkoshy */ 1553157144Sjkoshy 1554157144Sjkoshystatic void 1555157144Sjkoshypmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm) 1556157144Sjkoshy{ 1557157144Sjkoshy int ri; 1558157144Sjkoshy pid_t pid; 1559157144Sjkoshy struct pmc_owner *po; 1560157144Sjkoshy const struct pmc *pm; 1561157144Sjkoshy const struct pmc_process *pp; 1562157144Sjkoshy 1563157144Sjkoshy pid = td->td_proc->p_pid; 1564157144Sjkoshy 1565157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1566157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1567157144Sjkoshy pmclog_process_map_out(po, pid, pkm->pm_address, 1568157144Sjkoshy pkm->pm_address + pkm->pm_size); 1569157144Sjkoshy 1570157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1571157144Sjkoshy return; 1572157144Sjkoshy 1573157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1574157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1575157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1576157651Sjkoshy pmclog_process_map_out(pm->pm_owner, pid, 1577157651Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1578157144Sjkoshy} 1579157144Sjkoshy 1580157144Sjkoshy/* 1581174395Sjkoshy * Log mapping information about the kernel. 1582174395Sjkoshy */ 1583174395Sjkoshy 1584174395Sjkoshystatic void 1585174395Sjkoshypmc_log_kernel_mappings(struct pmc *pm) 1586174395Sjkoshy{ 1587174395Sjkoshy struct pmc_owner *po; 1588174395Sjkoshy struct pmckern_map_in *km, *kmbase; 1589174395Sjkoshy 1590174395Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1591174395Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 1592174395Sjkoshy ("[pmc,%d] non-sampling PMC (%p) desires mapping information", 1593174395Sjkoshy __LINE__, (void *) pm)); 1594174395Sjkoshy 1595174395Sjkoshy po = pm->pm_owner; 1596174395Sjkoshy 1597174395Sjkoshy if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE) 1598174395Sjkoshy return; 1599174395Sjkoshy 1600174395Sjkoshy /* 1601174395Sjkoshy * Log the current set of kernel modules. 1602174395Sjkoshy */ 1603174395Sjkoshy kmbase = linker_hwpmc_list_objects(); 1604174395Sjkoshy for (km = kmbase; km->pm_file != NULL; km++) { 1605174395Sjkoshy PMCDBG(LOG,REG,1,"%s %p", (char *) km->pm_file, 1606174395Sjkoshy (void *) km->pm_address); 1607174395Sjkoshy pmclog_process_map_in(po, (pid_t) -1, km->pm_address, 1608174395Sjkoshy km->pm_file); 1609174395Sjkoshy } 1610184205Sdes free(kmbase, M_LINKER); 1611174395Sjkoshy 1612174395Sjkoshy po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE; 1613174395Sjkoshy} 1614174395Sjkoshy 1615174395Sjkoshy/* 1616174395Sjkoshy * Log the mappings for a single process. 1617174395Sjkoshy */ 1618174395Sjkoshy 1619174395Sjkoshystatic void 1620174395Sjkoshypmc_log_process_mappings(struct pmc_owner *po, struct proc *p) 1621174395Sjkoshy{ 1622174395Sjkoshy} 1623174395Sjkoshy 1624174395Sjkoshy/* 1625174395Sjkoshy * Log mappings for all processes in the system. 1626174395Sjkoshy */ 1627174395Sjkoshy 1628174395Sjkoshystatic void 1629174395Sjkoshypmc_log_all_process_mappings(struct pmc_owner *po) 1630174395Sjkoshy{ 1631174395Sjkoshy struct proc *p, *top; 1632174395Sjkoshy 1633174395Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1634174395Sjkoshy 1635174395Sjkoshy if ((p = pfind(1)) == NULL) 1636174395Sjkoshy panic("[pmc,%d] Cannot find init", __LINE__); 1637174395Sjkoshy 1638174395Sjkoshy PROC_UNLOCK(p); 1639174395Sjkoshy 1640174395Sjkoshy sx_slock(&proctree_lock); 1641174395Sjkoshy 1642174395Sjkoshy top = p; 1643174395Sjkoshy 1644174395Sjkoshy for (;;) { 1645174395Sjkoshy pmc_log_process_mappings(po, p); 1646174395Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1647174395Sjkoshy p = LIST_FIRST(&p->p_children); 1648174395Sjkoshy else for (;;) { 1649174395Sjkoshy if (p == top) 1650174395Sjkoshy goto done; 1651174395Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1652174395Sjkoshy p = LIST_NEXT(p, p_sibling); 1653174395Sjkoshy break; 1654174395Sjkoshy } 1655174395Sjkoshy p = p->p_pptr; 1656174395Sjkoshy } 1657174395Sjkoshy } 1658174395Sjkoshy done: 1659174395Sjkoshy sx_sunlock(&proctree_lock); 1660174395Sjkoshy} 1661174395Sjkoshy 1662174395Sjkoshy/* 1663147191Sjkoshy * The 'hook' invoked from the kernel proper 1664147191Sjkoshy */ 1665147191Sjkoshy 1666147191Sjkoshy 1667153110Sru#ifdef DEBUG 1668147191Sjkoshyconst char *pmc_hooknames[] = { 1669157144Sjkoshy /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */ 1670147191Sjkoshy "", 1671147191Sjkoshy "EXEC", 1672147191Sjkoshy "CSW-IN", 1673147191Sjkoshy "CSW-OUT", 1674157144Sjkoshy "SAMPLE", 1675157144Sjkoshy "KLDLOAD", 1676157144Sjkoshy "KLDUNLOAD", 1677157144Sjkoshy "MMAP", 1678174395Sjkoshy "MUNMAP", 1679174395Sjkoshy "CALLCHAIN" 1680147191Sjkoshy}; 1681147191Sjkoshy#endif 1682147191Sjkoshy 1683147191Sjkoshystatic int 1684147191Sjkoshypmc_hook_handler(struct thread *td, int function, void *arg) 1685147191Sjkoshy{ 1686147191Sjkoshy 1687147191Sjkoshy PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1688147191Sjkoshy pmc_hooknames[function], arg); 1689147191Sjkoshy 1690147191Sjkoshy switch (function) 1691147191Sjkoshy { 1692147191Sjkoshy 1693147191Sjkoshy /* 1694145256Sjkoshy * Process exec() 1695145256Sjkoshy */ 1696145256Sjkoshy 1697145256Sjkoshy case PMC_FN_PROCESS_EXEC: 1698145256Sjkoshy { 1699147191Sjkoshy char *fullpath, *freepath; 1700145256Sjkoshy unsigned int ri; 1701147191Sjkoshy int is_using_hwpmcs; 1702145256Sjkoshy struct pmc *pm; 1703145256Sjkoshy struct proc *p; 1704145256Sjkoshy struct pmc_owner *po; 1705145256Sjkoshy struct pmc_process *pp; 1706147708Sjkoshy struct pmckern_procexec *pk; 1707145256Sjkoshy 1708145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1709145256Sjkoshy 1710147191Sjkoshy p = td->td_proc; 1711147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1712147191Sjkoshy 1713147708Sjkoshy pk = (struct pmckern_procexec *) arg; 1714147708Sjkoshy 1715147191Sjkoshy /* Inform owners of SS mode PMCs of the exec event. */ 1716147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1717147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1718147708Sjkoshy pmclog_process_procexec(po, PMC_ID_INVALID, 1719147708Sjkoshy p->p_pid, pk->pm_entryaddr, fullpath); 1720147191Sjkoshy 1721147191Sjkoshy PROC_LOCK(p); 1722147191Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1723147191Sjkoshy PROC_UNLOCK(p); 1724147191Sjkoshy 1725147191Sjkoshy if (!is_using_hwpmcs) { 1726147191Sjkoshy if (freepath) 1727184205Sdes free(freepath, M_TEMP); 1728147191Sjkoshy break; 1729147191Sjkoshy } 1730147191Sjkoshy 1731145256Sjkoshy /* 1732145256Sjkoshy * PMCs are not inherited across an exec(): remove any 1733145256Sjkoshy * PMCs that this process is the owner of. 1734145256Sjkoshy */ 1735145256Sjkoshy 1736145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1737145256Sjkoshy pmc_remove_owner(po); 1738147191Sjkoshy pmc_destroy_owner_descriptor(po); 1739145256Sjkoshy } 1740145256Sjkoshy 1741145256Sjkoshy /* 1742154483Sjkoshy * If the process being exec'ed is not the target of any 1743154483Sjkoshy * PMC, we are done. 1744145256Sjkoshy */ 1745154483Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 1746154483Sjkoshy if (freepath) 1747184205Sdes free(freepath, M_TEMP); 1748145256Sjkoshy break; 1749154483Sjkoshy } 1750145256Sjkoshy 1751147191Sjkoshy /* 1752147191Sjkoshy * Log the exec event to all monitoring owners. Skip 1753147191Sjkoshy * owners who have already recieved the event because 1754154483Sjkoshy * they had system sampling PMCs active. 1755147191Sjkoshy */ 1756147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1757147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1758147191Sjkoshy po = pm->pm_owner; 1759147191Sjkoshy if (po->po_sscount == 0 && 1760147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 1761147708Sjkoshy pmclog_process_procexec(po, pm->pm_id, 1762147708Sjkoshy p->p_pid, pk->pm_entryaddr, 1763147191Sjkoshy fullpath); 1764147191Sjkoshy } 1765147191Sjkoshy 1766147191Sjkoshy if (freepath) 1767184205Sdes free(freepath, M_TEMP); 1768147191Sjkoshy 1769145256Sjkoshy 1770145256Sjkoshy PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 1771147708Sjkoshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1772145256Sjkoshy 1773147708Sjkoshy if (pk->pm_credentialschanged == 0) /* no change */ 1774145256Sjkoshy break; 1775145256Sjkoshy 1776145256Sjkoshy /* 1777145256Sjkoshy * If the newly exec()'ed process has a different credential 1778145256Sjkoshy * than before, allow it to be the target of a PMC only if 1779145256Sjkoshy * the PMC's owner has sufficient priviledge. 1780145256Sjkoshy */ 1781145256Sjkoshy 1782145256Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1783145256Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1784145256Sjkoshy if (pmc_can_attach(pm, td->td_proc) != 0) 1785145256Sjkoshy pmc_detach_one_process(td->td_proc, 1786145256Sjkoshy pm, PMC_FLAG_NONE); 1787145256Sjkoshy 1788145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1789145256Sjkoshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1790145256Sjkoshy pp->pp_refcnt, pp)); 1791145256Sjkoshy 1792145256Sjkoshy /* 1793145256Sjkoshy * If this process is no longer the target of any 1794145256Sjkoshy * PMCs, we can remove the process entry and free 1795145256Sjkoshy * up space. 1796145256Sjkoshy */ 1797145256Sjkoshy 1798145256Sjkoshy if (pp->pp_refcnt == 0) { 1799145256Sjkoshy pmc_remove_process_descriptor(pp); 1800184205Sdes free(pp, M_PMC); 1801147191Sjkoshy break; 1802145256Sjkoshy } 1803145256Sjkoshy 1804145256Sjkoshy } 1805145256Sjkoshy break; 1806145256Sjkoshy 1807145256Sjkoshy case PMC_FN_CSW_IN: 1808147191Sjkoshy pmc_process_csw_in(td); 1809147191Sjkoshy break; 1810145256Sjkoshy 1811147191Sjkoshy case PMC_FN_CSW_OUT: 1812147191Sjkoshy pmc_process_csw_out(td); 1813147191Sjkoshy break; 1814145256Sjkoshy 1815145256Sjkoshy /* 1816147191Sjkoshy * Process accumulated PC samples. 1817147191Sjkoshy * 1818147191Sjkoshy * This function is expected to be called by hardclock() for 1819147191Sjkoshy * each CPU that has accumulated PC samples. 1820147191Sjkoshy * 1821147191Sjkoshy * This function is to be executed on the CPU whose samples 1822147191Sjkoshy * are being processed. 1823145256Sjkoshy */ 1824147191Sjkoshy case PMC_FN_DO_SAMPLES: 1825145256Sjkoshy 1826145256Sjkoshy /* 1827147191Sjkoshy * Clear the cpu specific bit in the CPU mask before 1828147191Sjkoshy * do the rest of the processing. If the NMI handler 1829147191Sjkoshy * gets invoked after the "atomic_clear_int()" call 1830147191Sjkoshy * below but before "pmc_process_samples()" gets 1831147191Sjkoshy * around to processing the interrupt, then we will 1832147191Sjkoshy * come back here at the next hardclock() tick (and 1833147191Sjkoshy * may find nothing to do if "pmc_process_samples()" 1834147191Sjkoshy * had already processed the interrupt). We don't 1835147191Sjkoshy * lose the interrupt sample. 1836145256Sjkoshy */ 1837147191Sjkoshy atomic_clear_int(&pmc_cpumask, (1 << PCPU_GET(cpuid))); 1838147191Sjkoshy pmc_process_samples(PCPU_GET(cpuid)); 1839147191Sjkoshy break; 1840145256Sjkoshy 1841157144Sjkoshy 1842157144Sjkoshy case PMC_FN_KLD_LOAD: 1843157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1844157144Sjkoshy pmc_process_kld_load((struct pmckern_map_in *) arg); 1845157144Sjkoshy break; 1846157144Sjkoshy 1847157144Sjkoshy case PMC_FN_KLD_UNLOAD: 1848157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1849157144Sjkoshy pmc_process_kld_unload((struct pmckern_map_out *) arg); 1850157144Sjkoshy break; 1851157144Sjkoshy 1852157144Sjkoshy case PMC_FN_MMAP: 1853157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1854157144Sjkoshy pmc_process_mmap(td, (struct pmckern_map_in *) arg); 1855157144Sjkoshy break; 1856157144Sjkoshy 1857157144Sjkoshy case PMC_FN_MUNMAP: 1858157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1859157144Sjkoshy pmc_process_munmap(td, (struct pmckern_map_out *) arg); 1860157144Sjkoshy break; 1861157144Sjkoshy 1862174395Sjkoshy case PMC_FN_USER_CALLCHAIN: 1863174395Sjkoshy /* 1864174395Sjkoshy * Record a call chain. 1865174395Sjkoshy */ 1866174395Sjkoshy pmc_capture_user_callchain(PCPU_GET(cpuid), 1867174395Sjkoshy (struct trapframe *) arg); 1868174395Sjkoshy break; 1869174395Sjkoshy 1870145256Sjkoshy default: 1871153110Sru#ifdef DEBUG 1872145256Sjkoshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 1873145256Sjkoshy#endif 1874145256Sjkoshy break; 1875145256Sjkoshy 1876145256Sjkoshy } 1877145256Sjkoshy 1878145256Sjkoshy return 0; 1879145256Sjkoshy} 1880145256Sjkoshy 1881145256Sjkoshy/* 1882145256Sjkoshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 1883145256Sjkoshy */ 1884145256Sjkoshy 1885145256Sjkoshystatic struct pmc_owner * 1886145256Sjkoshypmc_allocate_owner_descriptor(struct proc *p) 1887145256Sjkoshy{ 1888145256Sjkoshy uint32_t hindex; 1889145256Sjkoshy struct pmc_owner *po; 1890145256Sjkoshy struct pmc_ownerhash *poh; 1891145256Sjkoshy 1892145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1893145256Sjkoshy poh = &pmc_ownerhash[hindex]; 1894145256Sjkoshy 1895145256Sjkoshy /* allocate space for N pointers and one descriptor struct */ 1896184802Sjkoshy po = malloc(sizeof(struct pmc_owner), M_PMC, M_WAITOK|M_ZERO); 1897147191Sjkoshy po->po_sscount = po->po_error = po->po_flags = 0; 1898147191Sjkoshy po->po_file = NULL; 1899145256Sjkoshy po->po_owner = p; 1900147191Sjkoshy po->po_kthread = NULL; 1901145256Sjkoshy LIST_INIT(&po->po_pmcs); 1902145256Sjkoshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 1903145256Sjkoshy 1904147191Sjkoshy TAILQ_INIT(&po->po_logbuffers); 1905168856Sjkoshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN); 1906147191Sjkoshy 1907145256Sjkoshy PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 1908145256Sjkoshy p, p->p_pid, p->p_comm, po); 1909145256Sjkoshy 1910145256Sjkoshy return po; 1911145256Sjkoshy} 1912145256Sjkoshy 1913147191Sjkoshystatic void 1914147191Sjkoshypmc_destroy_owner_descriptor(struct pmc_owner *po) 1915147191Sjkoshy{ 1916147191Sjkoshy 1917147191Sjkoshy PMCDBG(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 1918147191Sjkoshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 1919147191Sjkoshy 1920147191Sjkoshy mtx_destroy(&po->po_mtx); 1921184205Sdes free(po, M_PMC); 1922147191Sjkoshy} 1923147191Sjkoshy 1924145256Sjkoshy/* 1925145256Sjkoshy * find the descriptor corresponding to process 'p', adding or removing it 1926145256Sjkoshy * as specified by 'mode'. 1927145256Sjkoshy */ 1928145256Sjkoshy 1929145256Sjkoshystatic struct pmc_process * 1930145256Sjkoshypmc_find_process_descriptor(struct proc *p, uint32_t mode) 1931145256Sjkoshy{ 1932145256Sjkoshy uint32_t hindex; 1933145256Sjkoshy struct pmc_process *pp, *ppnew; 1934145256Sjkoshy struct pmc_processhash *pph; 1935145256Sjkoshy 1936145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 1937145256Sjkoshy pph = &pmc_processhash[hindex]; 1938145256Sjkoshy 1939145256Sjkoshy ppnew = NULL; 1940145256Sjkoshy 1941145256Sjkoshy /* 1942145256Sjkoshy * Pre-allocate memory in the FIND_ALLOCATE case since we 1943145256Sjkoshy * cannot call malloc(9) once we hold a spin lock. 1944145256Sjkoshy */ 1945184802Sjkoshy if (mode & PMC_FLAG_ALLOCATE) 1946184214Sdes ppnew = malloc(sizeof(struct pmc_process) + md->pmd_npmc * 1947184802Sjkoshy sizeof(struct pmc_targetstate), M_PMC, M_WAITOK|M_ZERO); 1948145256Sjkoshy 1949145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1950145256Sjkoshy LIST_FOREACH(pp, pph, pp_next) 1951145256Sjkoshy if (pp->pp_proc == p) 1952145256Sjkoshy break; 1953145256Sjkoshy 1954145256Sjkoshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 1955145256Sjkoshy LIST_REMOVE(pp, pp_next); 1956145256Sjkoshy 1957145256Sjkoshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 1958145256Sjkoshy ppnew != NULL) { 1959145256Sjkoshy ppnew->pp_proc = p; 1960145256Sjkoshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 1961145256Sjkoshy pp = ppnew; 1962145256Sjkoshy ppnew = NULL; 1963145256Sjkoshy } 1964145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1965145256Sjkoshy 1966145256Sjkoshy if (pp != NULL && ppnew != NULL) 1967184205Sdes free(ppnew, M_PMC); 1968145256Sjkoshy 1969145256Sjkoshy return pp; 1970145256Sjkoshy} 1971145256Sjkoshy 1972145256Sjkoshy/* 1973145256Sjkoshy * remove a process descriptor from the process hash table. 1974145256Sjkoshy */ 1975145256Sjkoshy 1976145256Sjkoshystatic void 1977145256Sjkoshypmc_remove_process_descriptor(struct pmc_process *pp) 1978145256Sjkoshy{ 1979145256Sjkoshy KASSERT(pp->pp_refcnt == 0, 1980145256Sjkoshy ("[pmc,%d] Removing process descriptor %p with count %d", 1981145256Sjkoshy __LINE__, pp, pp->pp_refcnt)); 1982145256Sjkoshy 1983145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1984145256Sjkoshy LIST_REMOVE(pp, pp_next); 1985145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1986145256Sjkoshy} 1987145256Sjkoshy 1988145256Sjkoshy 1989145256Sjkoshy/* 1990145256Sjkoshy * find an owner descriptor corresponding to proc 'p' 1991145256Sjkoshy */ 1992145256Sjkoshy 1993145256Sjkoshystatic struct pmc_owner * 1994145256Sjkoshypmc_find_owner_descriptor(struct proc *p) 1995145256Sjkoshy{ 1996145256Sjkoshy uint32_t hindex; 1997145256Sjkoshy struct pmc_owner *po; 1998145256Sjkoshy struct pmc_ownerhash *poh; 1999145256Sjkoshy 2000145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2001145256Sjkoshy poh = &pmc_ownerhash[hindex]; 2002145256Sjkoshy 2003145256Sjkoshy po = NULL; 2004145256Sjkoshy LIST_FOREACH(po, poh, po_next) 2005145256Sjkoshy if (po->po_owner == p) 2006145256Sjkoshy break; 2007145256Sjkoshy 2008145256Sjkoshy PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 2009145256Sjkoshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 2010145256Sjkoshy 2011145256Sjkoshy return po; 2012145256Sjkoshy} 2013145256Sjkoshy 2014145256Sjkoshy/* 2015145256Sjkoshy * pmc_allocate_pmc_descriptor 2016145256Sjkoshy * 2017145256Sjkoshy * Allocate a pmc descriptor and initialize its 2018145256Sjkoshy * fields. 2019145256Sjkoshy */ 2020145256Sjkoshy 2021145256Sjkoshystatic struct pmc * 2022145256Sjkoshypmc_allocate_pmc_descriptor(void) 2023145256Sjkoshy{ 2024145256Sjkoshy struct pmc *pmc; 2025145256Sjkoshy 2026184802Sjkoshy pmc = malloc(sizeof(struct pmc), M_PMC, M_WAITOK|M_ZERO); 2027145256Sjkoshy 2028145256Sjkoshy if (pmc != NULL) { 2029145256Sjkoshy pmc->pm_owner = NULL; 2030145256Sjkoshy LIST_INIT(&pmc->pm_targets); 2031145256Sjkoshy } 2032145256Sjkoshy 2033145256Sjkoshy PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 2034145256Sjkoshy 2035145256Sjkoshy return pmc; 2036145256Sjkoshy} 2037145256Sjkoshy 2038145256Sjkoshy/* 2039145256Sjkoshy * Destroy a pmc descriptor. 2040145256Sjkoshy */ 2041145256Sjkoshy 2042145256Sjkoshystatic void 2043145256Sjkoshypmc_destroy_pmc_descriptor(struct pmc *pm) 2044145256Sjkoshy{ 2045145256Sjkoshy (void) pm; 2046145256Sjkoshy 2047153110Sru#ifdef DEBUG 2048145256Sjkoshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 2049145256Sjkoshy pm->pm_state == PMC_STATE_FREE, 2050145256Sjkoshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 2051145256Sjkoshy KASSERT(LIST_EMPTY(&pm->pm_targets), 2052145256Sjkoshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 2053145256Sjkoshy KASSERT(pm->pm_owner == NULL, 2054145256Sjkoshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 2055145256Sjkoshy KASSERT(pm->pm_runcount == 0, 2056145256Sjkoshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 2057145256Sjkoshy pm->pm_runcount)); 2058145256Sjkoshy#endif 2059145256Sjkoshy} 2060145256Sjkoshy 2061147191Sjkoshystatic void 2062147191Sjkoshypmc_wait_for_pmc_idle(struct pmc *pm) 2063147191Sjkoshy{ 2064153110Sru#ifdef DEBUG 2065147191Sjkoshy volatile int maxloop; 2066147191Sjkoshy 2067183266Sjkoshy maxloop = 100 * pmc_cpu_max(); 2068147191Sjkoshy#endif 2069147191Sjkoshy 2070147191Sjkoshy /* 2071147191Sjkoshy * Loop (with a forced context switch) till the PMC's runcount 2072147191Sjkoshy * comes down to zero. 2073147191Sjkoshy */ 2074147191Sjkoshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 2075153110Sru#ifdef DEBUG 2076147191Sjkoshy maxloop--; 2077147191Sjkoshy KASSERT(maxloop > 0, 2078147191Sjkoshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 2079147191Sjkoshy "pmc to be free", __LINE__, 2080147191Sjkoshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 2081147191Sjkoshy#endif 2082147191Sjkoshy pmc_force_context_switch(); 2083147191Sjkoshy } 2084147191Sjkoshy} 2085147191Sjkoshy 2086145256Sjkoshy/* 2087145256Sjkoshy * This function does the following things: 2088145256Sjkoshy * 2089145256Sjkoshy * - detaches the PMC from hardware 2090145256Sjkoshy * - unlinks all target threads that were attached to it 2091145256Sjkoshy * - removes the PMC from its owner's list 2092145256Sjkoshy * - destroy's the PMC private mutex 2093145256Sjkoshy * 2094145256Sjkoshy * Once this function completes, the given pmc pointer can be safely 2095145256Sjkoshy * FREE'd by the caller. 2096145256Sjkoshy */ 2097145256Sjkoshy 2098145256Sjkoshystatic void 2099145256Sjkoshypmc_release_pmc_descriptor(struct pmc *pm) 2100145256Sjkoshy{ 2101145774Sjkoshy enum pmc_mode mode; 2102145256Sjkoshy struct pmc_hw *phw; 2103184802Sjkoshy u_int adjri, ri, cpu; 2104147191Sjkoshy struct pmc_owner *po; 2105184802Sjkoshy struct pmc_binding pb; 2106145256Sjkoshy struct pmc_process *pp; 2107184802Sjkoshy struct pmc_classdep *pcd; 2108145256Sjkoshy struct pmc_target *ptgt, *tmp; 2109145256Sjkoshy 2110145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2111145256Sjkoshy 2112145256Sjkoshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 2113145256Sjkoshy 2114145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2115184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2116145774Sjkoshy mode = PMC_TO_MODE(pm); 2117145256Sjkoshy 2118145256Sjkoshy PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 2119145774Sjkoshy mode); 2120145256Sjkoshy 2121145256Sjkoshy /* 2122145256Sjkoshy * First, we take the PMC off hardware. 2123145256Sjkoshy */ 2124145301Simp cpu = 0; 2125145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2126145256Sjkoshy 2127145256Sjkoshy /* 2128145256Sjkoshy * A system mode PMC runs on a specific CPU. Switch 2129145256Sjkoshy * to this CPU and turn hardware off. 2130145256Sjkoshy */ 2131145256Sjkoshy pmc_save_cpu_binding(&pb); 2132145256Sjkoshy 2133145774Sjkoshy cpu = PMC_TO_CPU(pm); 2134145256Sjkoshy 2135147191Sjkoshy pmc_select_cpu(cpu); 2136145256Sjkoshy 2137147191Sjkoshy /* switch off non-stalled CPUs */ 2138147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 2139147867Sjkoshy pm->pm_stalled == 0) { 2140145256Sjkoshy 2141145256Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 2142145256Sjkoshy 2143145256Sjkoshy KASSERT(phw->phw_pmc == pm, 2144145256Sjkoshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 2145145256Sjkoshy __LINE__, ri, phw->phw_pmc, pm)); 2146145256Sjkoshy PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 2147145256Sjkoshy 2148145256Sjkoshy critical_enter(); 2149184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 2150145256Sjkoshy critical_exit(); 2151145256Sjkoshy } 2152145256Sjkoshy 2153145256Sjkoshy PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 2154145256Sjkoshy 2155145256Sjkoshy critical_enter(); 2156184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 2157145256Sjkoshy critical_exit(); 2158145256Sjkoshy 2159147191Sjkoshy /* adjust the global and process count of SS mode PMCs */ 2160147191Sjkoshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 2161147191Sjkoshy po = pm->pm_owner; 2162147191Sjkoshy po->po_sscount--; 2163147191Sjkoshy if (po->po_sscount == 0) { 2164147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2165147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2166147191Sjkoshy } 2167147191Sjkoshy } 2168147191Sjkoshy 2169145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2170145256Sjkoshy 2171145256Sjkoshy pmc_restore_cpu_binding(&pb); 2172145256Sjkoshy 2173147191Sjkoshy /* 2174147191Sjkoshy * We could have references to this PMC structure in 2175147191Sjkoshy * the per-cpu sample queues. Wait for the queue to 2176147191Sjkoshy * drain. 2177147191Sjkoshy */ 2178147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2179147191Sjkoshy 2180145774Sjkoshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 2181145256Sjkoshy 2182145256Sjkoshy /* 2183145256Sjkoshy * A virtual PMC could be running on multiple CPUs at 2184145256Sjkoshy * a given instant. 2185145256Sjkoshy * 2186145256Sjkoshy * By marking its state as DELETED, we ensure that 2187145256Sjkoshy * this PMC is never further scheduled on hardware. 2188145256Sjkoshy * 2189145256Sjkoshy * Then we wait till all CPUs are done with this PMC. 2190145256Sjkoshy */ 2191145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2192145256Sjkoshy 2193145256Sjkoshy 2194147191Sjkoshy /* Wait for the PMCs runcount to come to zero. */ 2195147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2196145256Sjkoshy 2197145256Sjkoshy /* 2198145256Sjkoshy * At this point the PMC is off all CPUs and cannot be 2199145256Sjkoshy * freshly scheduled onto a CPU. It is now safe to 2200145256Sjkoshy * unlink all targets from this PMC. If a 2201145256Sjkoshy * process-record's refcount falls to zero, we remove 2202145256Sjkoshy * it from the hash table. The module-wide SX lock 2203145256Sjkoshy * protects us from races. 2204145256Sjkoshy */ 2205145256Sjkoshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 2206145256Sjkoshy pp = ptgt->pt_process; 2207145256Sjkoshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 2208145256Sjkoshy 2209145256Sjkoshy PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 2210145256Sjkoshy 2211145256Sjkoshy /* 2212145256Sjkoshy * If the target process record shows that no 2213145256Sjkoshy * PMCs are attached to it, reclaim its space. 2214145256Sjkoshy */ 2215145256Sjkoshy 2216145256Sjkoshy if (pp->pp_refcnt == 0) { 2217145256Sjkoshy pmc_remove_process_descriptor(pp); 2218184205Sdes free(pp, M_PMC); 2219145256Sjkoshy } 2220145256Sjkoshy } 2221145256Sjkoshy 2222145256Sjkoshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 2223145256Sjkoshy 2224145256Sjkoshy } 2225145256Sjkoshy 2226145256Sjkoshy /* 2227145256Sjkoshy * Release any MD resources 2228145256Sjkoshy */ 2229184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pm); 2230145256Sjkoshy 2231145256Sjkoshy /* 2232145256Sjkoshy * Update row disposition 2233145256Sjkoshy */ 2234145256Sjkoshy 2235145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 2236145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2237145256Sjkoshy else 2238145256Sjkoshy PMC_UNMARK_ROW_THREAD(ri); 2239145256Sjkoshy 2240145256Sjkoshy /* unlink from the owner's list */ 2241147191Sjkoshy if (pm->pm_owner) { 2242147191Sjkoshy LIST_REMOVE(pm, pm_next); 2243147191Sjkoshy pm->pm_owner = NULL; 2244147191Sjkoshy } 2245145256Sjkoshy 2246145256Sjkoshy pmc_destroy_pmc_descriptor(pm); 2247145256Sjkoshy} 2248145256Sjkoshy 2249145256Sjkoshy/* 2250145256Sjkoshy * Register an owner and a pmc. 2251145256Sjkoshy */ 2252145256Sjkoshy 2253145256Sjkoshystatic int 2254145256Sjkoshypmc_register_owner(struct proc *p, struct pmc *pmc) 2255145256Sjkoshy{ 2256145256Sjkoshy struct pmc_owner *po; 2257145256Sjkoshy 2258145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2259145256Sjkoshy 2260145774Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2261147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 2262145256Sjkoshy return ENOMEM; 2263145256Sjkoshy 2264145256Sjkoshy KASSERT(pmc->pm_owner == NULL, 2265145256Sjkoshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 2266145256Sjkoshy pmc->pm_owner = po; 2267145256Sjkoshy 2268147191Sjkoshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 2269145256Sjkoshy 2270145256Sjkoshy PROC_LOCK(p); 2271145256Sjkoshy p->p_flag |= P_HWPMC; 2272145256Sjkoshy PROC_UNLOCK(p); 2273145256Sjkoshy 2274147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 2275147191Sjkoshy pmclog_process_pmcallocate(pmc); 2276145256Sjkoshy 2277147191Sjkoshy PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2278147191Sjkoshy po, pmc); 2279147191Sjkoshy 2280145256Sjkoshy return 0; 2281145256Sjkoshy} 2282145256Sjkoshy 2283145256Sjkoshy/* 2284145256Sjkoshy * Return the current row disposition: 2285145256Sjkoshy * == 0 => FREE 2286145256Sjkoshy * > 0 => PROCESS MODE 2287145256Sjkoshy * < 0 => SYSTEM MODE 2288145256Sjkoshy */ 2289145256Sjkoshy 2290145256Sjkoshyint 2291145256Sjkoshypmc_getrowdisp(int ri) 2292145256Sjkoshy{ 2293145256Sjkoshy return pmc_pmcdisp[ri]; 2294145256Sjkoshy} 2295145256Sjkoshy 2296145256Sjkoshy/* 2297145256Sjkoshy * Check if a PMC at row index 'ri' can be allocated to the current 2298145256Sjkoshy * process. 2299145256Sjkoshy * 2300145256Sjkoshy * Allocation can fail if: 2301145256Sjkoshy * - the current process is already being profiled by a PMC at index 'ri', 2302145256Sjkoshy * attached to it via OP_PMCATTACH. 2303145256Sjkoshy * - the current process has already allocated a PMC at index 'ri' 2304145256Sjkoshy * via OP_ALLOCATE. 2305145256Sjkoshy */ 2306145256Sjkoshy 2307145256Sjkoshystatic int 2308145774Sjkoshypmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2309145256Sjkoshy{ 2310145774Sjkoshy enum pmc_mode mode; 2311145774Sjkoshy struct pmc *pm; 2312145256Sjkoshy struct pmc_owner *po; 2313145256Sjkoshy struct pmc_process *pp; 2314145256Sjkoshy 2315145774Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2316145774Sjkoshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2317145256Sjkoshy 2318145774Sjkoshy /* 2319145774Sjkoshy * We shouldn't have already allocated a process-mode PMC at 2320145774Sjkoshy * row index 'ri'. 2321145774Sjkoshy * 2322145774Sjkoshy * We shouldn't have allocated a system-wide PMC on the same 2323145774Sjkoshy * CPU and same RI. 2324145774Sjkoshy */ 2325145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2326147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2327145774Sjkoshy if (PMC_TO_ROWINDEX(pm) == ri) { 2328145774Sjkoshy mode = PMC_TO_MODE(pm); 2329145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) 2330145774Sjkoshy return EEXIST; 2331145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && 2332145774Sjkoshy (int) PMC_TO_CPU(pm) == cpu) 2333145774Sjkoshy return EEXIST; 2334145774Sjkoshy } 2335145774Sjkoshy } 2336145256Sjkoshy 2337145774Sjkoshy /* 2338145774Sjkoshy * We also shouldn't be the target of any PMC at this index 2339145774Sjkoshy * since otherwise a PMC_ATTACH to ourselves will fail. 2340145774Sjkoshy */ 2341145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2342145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc) 2343145256Sjkoshy return EEXIST; 2344145256Sjkoshy 2345145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2346145256Sjkoshy p, p->p_pid, p->p_comm, ri); 2347145256Sjkoshy 2348145256Sjkoshy return 0; 2349145256Sjkoshy} 2350145256Sjkoshy 2351145256Sjkoshy/* 2352145256Sjkoshy * Check if a given PMC at row index 'ri' can be currently used in 2353145256Sjkoshy * mode 'mode'. 2354145256Sjkoshy */ 2355145256Sjkoshy 2356145256Sjkoshystatic int 2357145256Sjkoshypmc_can_allocate_row(int ri, enum pmc_mode mode) 2358145256Sjkoshy{ 2359145256Sjkoshy enum pmc_disp disp; 2360145256Sjkoshy 2361145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2362145256Sjkoshy 2363145256Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2364145256Sjkoshy 2365145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2366145256Sjkoshy disp = PMC_DISP_STANDALONE; 2367145256Sjkoshy else 2368145256Sjkoshy disp = PMC_DISP_THREAD; 2369145256Sjkoshy 2370145256Sjkoshy /* 2371145256Sjkoshy * check disposition for PMC row 'ri': 2372145256Sjkoshy * 2373145256Sjkoshy * Expected disposition Row-disposition Result 2374145256Sjkoshy * 2375145256Sjkoshy * STANDALONE STANDALONE or FREE proceed 2376145256Sjkoshy * STANDALONE THREAD fail 2377145256Sjkoshy * THREAD THREAD or FREE proceed 2378145256Sjkoshy * THREAD STANDALONE fail 2379145256Sjkoshy */ 2380145256Sjkoshy 2381145256Sjkoshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2382145256Sjkoshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2383145256Sjkoshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2384145256Sjkoshy return EBUSY; 2385145256Sjkoshy 2386145256Sjkoshy /* 2387145256Sjkoshy * All OK 2388145256Sjkoshy */ 2389145256Sjkoshy 2390145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2391145256Sjkoshy 2392145256Sjkoshy return 0; 2393145256Sjkoshy 2394145256Sjkoshy} 2395145256Sjkoshy 2396145256Sjkoshy/* 2397145774Sjkoshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2398145256Sjkoshy */ 2399145256Sjkoshy 2400145256Sjkoshystatic struct pmc * 2401145256Sjkoshypmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2402145256Sjkoshy{ 2403147191Sjkoshy struct pmc *pm; 2404145256Sjkoshy 2405145774Sjkoshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2406145774Sjkoshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2407145774Sjkoshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2408145256Sjkoshy 2409147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2410147191Sjkoshy if (pm->pm_id == pmcid) 2411147191Sjkoshy return pm; 2412145256Sjkoshy 2413145256Sjkoshy return NULL; 2414145256Sjkoshy} 2415145256Sjkoshy 2416145256Sjkoshystatic int 2417145256Sjkoshypmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2418145256Sjkoshy{ 2419145256Sjkoshy 2420145256Sjkoshy struct pmc *pm; 2421145256Sjkoshy struct pmc_owner *po; 2422145256Sjkoshy 2423145256Sjkoshy PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid); 2424145256Sjkoshy 2425145256Sjkoshy if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) 2426145256Sjkoshy return ESRCH; 2427145256Sjkoshy 2428145256Sjkoshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2429145256Sjkoshy return EINVAL; 2430145256Sjkoshy 2431145256Sjkoshy PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2432145256Sjkoshy 2433145256Sjkoshy *pmc = pm; 2434145256Sjkoshy return 0; 2435145256Sjkoshy} 2436145256Sjkoshy 2437145256Sjkoshy/* 2438145256Sjkoshy * Start a PMC. 2439145256Sjkoshy */ 2440145256Sjkoshy 2441145256Sjkoshystatic int 2442145256Sjkoshypmc_start(struct pmc *pm) 2443145256Sjkoshy{ 2444145774Sjkoshy enum pmc_mode mode; 2445147191Sjkoshy struct pmc_owner *po; 2446145256Sjkoshy struct pmc_binding pb; 2447184802Sjkoshy struct pmc_classdep *pcd; 2448184802Sjkoshy int adjri, error, cpu, ri; 2449145256Sjkoshy 2450145256Sjkoshy KASSERT(pm != NULL, 2451145256Sjkoshy ("[pmc,%d] null pm", __LINE__)); 2452145256Sjkoshy 2453145774Sjkoshy mode = PMC_TO_MODE(pm); 2454145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2455184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2456184802Sjkoshy 2457145774Sjkoshy error = 0; 2458145256Sjkoshy 2459145774Sjkoshy PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2460145774Sjkoshy 2461147191Sjkoshy po = pm->pm_owner; 2462145256Sjkoshy 2463174395Sjkoshy /* 2464174395Sjkoshy * Disallow PMCSTART if a logfile is required but has not been 2465174395Sjkoshy * configured yet. 2466174395Sjkoshy */ 2467174395Sjkoshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2468174395Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2469184802Sjkoshy return (EDOOFUS); /* programming error */ 2470174395Sjkoshy 2471174395Sjkoshy /* 2472174395Sjkoshy * If this is a sampling mode PMC, log mapping information for 2473174395Sjkoshy * the kernel modules that are currently loaded. 2474174395Sjkoshy */ 2475174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2476174395Sjkoshy pmc_log_kernel_mappings(pm); 2477174395Sjkoshy 2478145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2479145256Sjkoshy 2480145256Sjkoshy /* 2481147191Sjkoshy * If a PMCATTACH has never been done on this PMC, 2482147191Sjkoshy * attach it to its owner process. 2483145256Sjkoshy */ 2484145256Sjkoshy 2485145256Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 2486147191Sjkoshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2487147191Sjkoshy pmc_attach_process(po->po_owner, pm); 2488145256Sjkoshy 2489145774Sjkoshy /* 2490147191Sjkoshy * If the PMC is attached to its owner, then force a context 2491147191Sjkoshy * switch to ensure that the MD state gets set correctly. 2492145256Sjkoshy */ 2493145256Sjkoshy 2494147191Sjkoshy if (error == 0) { 2495147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2496147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2497147191Sjkoshy pmc_force_context_switch(); 2498147191Sjkoshy } 2499147191Sjkoshy 2500184802Sjkoshy return (error); 2501147191Sjkoshy } 2502145256Sjkoshy 2503147191Sjkoshy 2504147191Sjkoshy /* 2505147191Sjkoshy * A system-wide PMC. 2506174395Sjkoshy * 2507147191Sjkoshy * Add the owner to the global list if this is a system-wide 2508147191Sjkoshy * sampling PMC. 2509147191Sjkoshy */ 2510147191Sjkoshy 2511147191Sjkoshy if (mode == PMC_MODE_SS) { 2512147191Sjkoshy if (po->po_sscount == 0) { 2513147191Sjkoshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2514147191Sjkoshy atomic_add_rel_int(&pmc_ss_count, 1); 2515147191Sjkoshy PMCDBG(PMC,OPS,1, "po=%p in global list", po); 2516147191Sjkoshy } 2517147191Sjkoshy po->po_sscount++; 2518145256Sjkoshy } 2519145256Sjkoshy 2520174395Sjkoshy /* Log mapping information for all processes in the system. */ 2521174395Sjkoshy pmc_log_all_process_mappings(po); 2522157144Sjkoshy 2523145256Sjkoshy /* 2524147191Sjkoshy * Move to the CPU associated with this 2525145256Sjkoshy * PMC, and start the hardware. 2526145256Sjkoshy */ 2527145256Sjkoshy 2528145256Sjkoshy pmc_save_cpu_binding(&pb); 2529145256Sjkoshy 2530145774Sjkoshy cpu = PMC_TO_CPU(pm); 2531145256Sjkoshy 2532183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2533184802Sjkoshy return (ENXIO); 2534145256Sjkoshy 2535145256Sjkoshy pmc_select_cpu(cpu); 2536145256Sjkoshy 2537145256Sjkoshy /* 2538145256Sjkoshy * global PMCs are configured at allocation time 2539145256Sjkoshy * so write out the initial value and start the PMC. 2540145256Sjkoshy */ 2541145256Sjkoshy 2542147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2543147191Sjkoshy 2544145774Sjkoshy critical_enter(); 2545184802Sjkoshy if ((error = pcd->pcd_write_pmc(cpu, adjri, 2546145774Sjkoshy PMC_IS_SAMPLING_MODE(mode) ? 2547145256Sjkoshy pm->pm_sc.pm_reloadcount : 2548145256Sjkoshy pm->pm_sc.pm_initial)) == 0) 2549184802Sjkoshy error = pcd->pcd_start_pmc(cpu, adjri); 2550145774Sjkoshy critical_exit(); 2551145256Sjkoshy 2552145256Sjkoshy pmc_restore_cpu_binding(&pb); 2553145256Sjkoshy 2554184802Sjkoshy return (error); 2555145256Sjkoshy} 2556145256Sjkoshy 2557145256Sjkoshy/* 2558145256Sjkoshy * Stop a PMC. 2559145256Sjkoshy */ 2560145256Sjkoshy 2561145256Sjkoshystatic int 2562145256Sjkoshypmc_stop(struct pmc *pm) 2563145256Sjkoshy{ 2564147191Sjkoshy struct pmc_owner *po; 2565145256Sjkoshy struct pmc_binding pb; 2566184802Sjkoshy struct pmc_classdep *pcd; 2567184802Sjkoshy int adjri, cpu, error, ri; 2568145256Sjkoshy 2569145256Sjkoshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2570145256Sjkoshy 2571145774Sjkoshy PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2572145774Sjkoshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2573145256Sjkoshy 2574145256Sjkoshy pm->pm_state = PMC_STATE_STOPPED; 2575145256Sjkoshy 2576145256Sjkoshy /* 2577145256Sjkoshy * If the PMC is a virtual mode one, changing the state to 2578145256Sjkoshy * non-RUNNING is enough to ensure that the PMC never gets 2579145256Sjkoshy * scheduled. 2580145256Sjkoshy * 2581145256Sjkoshy * If this PMC is current running on a CPU, then it will 2582145256Sjkoshy * handled correctly at the time its target process is context 2583145256Sjkoshy * switched out. 2584145256Sjkoshy */ 2585145256Sjkoshy 2586145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2587145256Sjkoshy return 0; 2588145256Sjkoshy 2589145256Sjkoshy /* 2590145256Sjkoshy * A system-mode PMC. Move to the CPU associated with 2591145256Sjkoshy * this PMC, and stop the hardware. We update the 2592145256Sjkoshy * 'initial count' so that a subsequent PMCSTART will 2593145256Sjkoshy * resume counting from the current hardware count. 2594145256Sjkoshy */ 2595145256Sjkoshy 2596145256Sjkoshy pmc_save_cpu_binding(&pb); 2597145256Sjkoshy 2598145774Sjkoshy cpu = PMC_TO_CPU(pm); 2599145256Sjkoshy 2600183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 2601145774Sjkoshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2602145774Sjkoshy 2603183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2604145256Sjkoshy return ENXIO; 2605145256Sjkoshy 2606145256Sjkoshy pmc_select_cpu(cpu); 2607145256Sjkoshy 2608145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2609184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2610145256Sjkoshy 2611145774Sjkoshy critical_enter(); 2612184802Sjkoshy if ((error = pcd->pcd_stop_pmc(cpu, adjri)) == 0) 2613184802Sjkoshy error = pcd->pcd_read_pmc(cpu, adjri, &pm->pm_sc.pm_initial); 2614145774Sjkoshy critical_exit(); 2615145774Sjkoshy 2616145256Sjkoshy pmc_restore_cpu_binding(&pb); 2617145256Sjkoshy 2618147191Sjkoshy po = pm->pm_owner; 2619147191Sjkoshy 2620147191Sjkoshy /* remove this owner from the global list of SS PMC owners */ 2621147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2622147191Sjkoshy po->po_sscount--; 2623147191Sjkoshy if (po->po_sscount == 0) { 2624147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2625147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2626147191Sjkoshy PMCDBG(PMC,OPS,2,"po=%p removed from global list", po); 2627147191Sjkoshy } 2628147191Sjkoshy } 2629147191Sjkoshy 2630184802Sjkoshy return (error); 2631145256Sjkoshy} 2632145256Sjkoshy 2633145256Sjkoshy 2634153110Sru#ifdef DEBUG 2635145256Sjkoshystatic const char *pmc_op_to_name[] = { 2636145256Sjkoshy#undef __PMC_OP 2637145256Sjkoshy#define __PMC_OP(N, D) #N , 2638145256Sjkoshy __PMC_OPS() 2639145256Sjkoshy NULL 2640145256Sjkoshy}; 2641145256Sjkoshy#endif 2642145256Sjkoshy 2643145256Sjkoshy/* 2644145256Sjkoshy * The syscall interface 2645145256Sjkoshy */ 2646145256Sjkoshy 2647145256Sjkoshy#define PMC_GET_SX_XLOCK(...) do { \ 2648145256Sjkoshy sx_xlock(&pmc_sx); \ 2649145256Sjkoshy if (pmc_hook == NULL) { \ 2650145256Sjkoshy sx_xunlock(&pmc_sx); \ 2651145256Sjkoshy return __VA_ARGS__; \ 2652145256Sjkoshy } \ 2653145256Sjkoshy} while (0) 2654145256Sjkoshy 2655145256Sjkoshy#define PMC_DOWNGRADE_SX() do { \ 2656145256Sjkoshy sx_downgrade(&pmc_sx); \ 2657145256Sjkoshy is_sx_downgraded = 1; \ 2658145256Sjkoshy} while (0) 2659145256Sjkoshy 2660145256Sjkoshystatic int 2661145256Sjkoshypmc_syscall_handler(struct thread *td, void *syscall_args) 2662145256Sjkoshy{ 2663145256Sjkoshy int error, is_sx_downgraded, op; 2664145256Sjkoshy struct pmc_syscall_args *c; 2665145256Sjkoshy void *arg; 2666145256Sjkoshy 2667145256Sjkoshy PMC_GET_SX_XLOCK(ENOSYS); 2668145256Sjkoshy 2669147191Sjkoshy DROP_GIANT(); 2670147191Sjkoshy 2671145256Sjkoshy is_sx_downgraded = 0; 2672145256Sjkoshy 2673145256Sjkoshy c = (struct pmc_syscall_args *) syscall_args; 2674145256Sjkoshy 2675145256Sjkoshy op = c->pmop_code; 2676145256Sjkoshy arg = c->pmop_data; 2677145256Sjkoshy 2678145256Sjkoshy PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2679145256Sjkoshy pmc_op_to_name[op], arg); 2680145256Sjkoshy 2681145256Sjkoshy error = 0; 2682145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2683145256Sjkoshy 2684145256Sjkoshy switch(op) 2685145256Sjkoshy { 2686145256Sjkoshy 2687145256Sjkoshy 2688145256Sjkoshy /* 2689145256Sjkoshy * Configure a log file. 2690145256Sjkoshy * 2691145256Sjkoshy * XXX This OP will be reworked. 2692145256Sjkoshy */ 2693145256Sjkoshy 2694145256Sjkoshy case PMC_OP_CONFIGURELOG: 2695145256Sjkoshy { 2696157144Sjkoshy struct proc *p; 2697156466Sjkoshy struct pmc *pm; 2698145256Sjkoshy struct pmc_owner *po; 2699145256Sjkoshy struct pmc_op_configurelog cl; 2700145256Sjkoshy 2701145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2702145256Sjkoshy 2703145256Sjkoshy if ((error = copyin(arg, &cl, sizeof(cl))) != 0) 2704145256Sjkoshy break; 2705145256Sjkoshy 2706145256Sjkoshy /* mark this process as owning a log file */ 2707145256Sjkoshy p = td->td_proc; 2708145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2709147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2710147191Sjkoshy error = ENOMEM; 2711147191Sjkoshy break; 2712147191Sjkoshy } 2713145256Sjkoshy 2714147191Sjkoshy /* 2715147191Sjkoshy * If a valid fd was passed in, try to configure that, 2716147191Sjkoshy * otherwise if 'fd' was less than zero and there was 2717147191Sjkoshy * a log file configured, flush its buffers and 2718147191Sjkoshy * de-configure it. 2719147191Sjkoshy */ 2720147191Sjkoshy if (cl.pm_logfd >= 0) 2721185363Sjkoshy error = pmclog_configure_log(md, po, cl.pm_logfd); 2722147191Sjkoshy else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2723147191Sjkoshy pmclog_process_closelog(po); 2724147191Sjkoshy error = pmclog_flush(po); 2725156466Sjkoshy if (error == 0) { 2726156466Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2727156834Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 2728156834Sjkoshy pm->pm_state == PMC_STATE_RUNNING) 2729156466Sjkoshy pmc_stop(pm); 2730147191Sjkoshy error = pmclog_deconfigure_log(po); 2731156466Sjkoshy } 2732147191Sjkoshy } else 2733147191Sjkoshy error = EINVAL; 2734157144Sjkoshy 2735157144Sjkoshy if (error) 2736157144Sjkoshy break; 2737147191Sjkoshy } 2738147191Sjkoshy break; 2739147191Sjkoshy 2740147191Sjkoshy 2741147191Sjkoshy /* 2742147191Sjkoshy * Flush a log file. 2743147191Sjkoshy */ 2744147191Sjkoshy 2745147191Sjkoshy case PMC_OP_FLUSHLOG: 2746147191Sjkoshy { 2747147191Sjkoshy struct pmc_owner *po; 2748147191Sjkoshy 2749147191Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2750147191Sjkoshy 2751147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2752147191Sjkoshy error = EINVAL; 2753145256Sjkoshy break; 2754147191Sjkoshy } 2755145256Sjkoshy 2756147191Sjkoshy error = pmclog_flush(po); 2757145256Sjkoshy } 2758145256Sjkoshy break; 2759145256Sjkoshy 2760145256Sjkoshy /* 2761145256Sjkoshy * Retrieve hardware configuration. 2762145256Sjkoshy */ 2763145256Sjkoshy 2764145256Sjkoshy case PMC_OP_GETCPUINFO: /* CPU information */ 2765145256Sjkoshy { 2766145256Sjkoshy struct pmc_op_getcpuinfo gci; 2767184802Sjkoshy struct pmc_classinfo *pci; 2768184802Sjkoshy struct pmc_classdep *pcd; 2769184802Sjkoshy int cl; 2770145256Sjkoshy 2771145256Sjkoshy gci.pm_cputype = md->pmd_cputype; 2772183266Sjkoshy gci.pm_ncpu = pmc_cpu_max(); 2773145256Sjkoshy gci.pm_npmc = md->pmd_npmc; 2774145256Sjkoshy gci.pm_nclass = md->pmd_nclass; 2775184802Sjkoshy pci = gci.pm_classes; 2776184802Sjkoshy pcd = md->pmd_classdep; 2777184802Sjkoshy for (cl = 0; cl < md->pmd_nclass; cl++, pci++, pcd++) { 2778184802Sjkoshy pci->pm_caps = pcd->pcd_caps; 2779184802Sjkoshy pci->pm_class = pcd->pcd_class; 2780184802Sjkoshy pci->pm_width = pcd->pcd_width; 2781184802Sjkoshy pci->pm_num = pcd->pcd_num; 2782184802Sjkoshy } 2783145256Sjkoshy error = copyout(&gci, arg, sizeof(gci)); 2784145256Sjkoshy } 2785145256Sjkoshy break; 2786145256Sjkoshy 2787145256Sjkoshy 2788145256Sjkoshy /* 2789145256Sjkoshy * Get module statistics 2790145256Sjkoshy */ 2791145256Sjkoshy 2792145256Sjkoshy case PMC_OP_GETDRIVERSTATS: 2793145256Sjkoshy { 2794145256Sjkoshy struct pmc_op_getdriverstats gms; 2795145256Sjkoshy 2796145256Sjkoshy bcopy(&pmc_stats, &gms, sizeof(gms)); 2797145256Sjkoshy error = copyout(&gms, arg, sizeof(gms)); 2798145256Sjkoshy } 2799145256Sjkoshy break; 2800145256Sjkoshy 2801145256Sjkoshy 2802145256Sjkoshy /* 2803145256Sjkoshy * Retrieve module version number 2804145256Sjkoshy */ 2805145256Sjkoshy 2806145256Sjkoshy case PMC_OP_GETMODULEVERSION: 2807145256Sjkoshy { 2808147191Sjkoshy uint32_t cv, modv; 2809147191Sjkoshy 2810147191Sjkoshy /* retrieve the client's idea of the ABI version */ 2811147191Sjkoshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 2812147191Sjkoshy break; 2813147191Sjkoshy /* don't service clients newer than our driver */ 2814147191Sjkoshy modv = PMC_VERSION; 2815147191Sjkoshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 2816147191Sjkoshy error = EPROGMISMATCH; 2817147191Sjkoshy break; 2818147191Sjkoshy } 2819147191Sjkoshy error = copyout(&modv, arg, sizeof(int)); 2820145256Sjkoshy } 2821145256Sjkoshy break; 2822145256Sjkoshy 2823145256Sjkoshy 2824145256Sjkoshy /* 2825145256Sjkoshy * Retrieve the state of all the PMCs on a given 2826145256Sjkoshy * CPU. 2827145256Sjkoshy */ 2828145256Sjkoshy 2829145256Sjkoshy case PMC_OP_GETPMCINFO: 2830145256Sjkoshy { 2831184802Sjkoshy int ari; 2832184802Sjkoshy struct pmc *pm; 2833184802Sjkoshy size_t pmcinfo_size; 2834145256Sjkoshy uint32_t cpu, n, npmc; 2835184802Sjkoshy struct pmc_owner *po; 2836184802Sjkoshy struct pmc_binding pb; 2837184802Sjkoshy struct pmc_classdep *pcd; 2838145256Sjkoshy struct pmc_info *p, *pmcinfo; 2839145256Sjkoshy struct pmc_op_getpmcinfo *gpi; 2840145256Sjkoshy 2841145256Sjkoshy PMC_DOWNGRADE_SX(); 2842145256Sjkoshy 2843145256Sjkoshy gpi = (struct pmc_op_getpmcinfo *) arg; 2844145256Sjkoshy 2845145256Sjkoshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 2846145256Sjkoshy break; 2847145256Sjkoshy 2848183266Sjkoshy if (cpu >= pmc_cpu_max()) { 2849145256Sjkoshy error = EINVAL; 2850145256Sjkoshy break; 2851145256Sjkoshy } 2852145256Sjkoshy 2853183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 2854145256Sjkoshy error = ENXIO; 2855145256Sjkoshy break; 2856145256Sjkoshy } 2857145256Sjkoshy 2858145256Sjkoshy /* switch to CPU 'cpu' */ 2859145256Sjkoshy pmc_save_cpu_binding(&pb); 2860145256Sjkoshy pmc_select_cpu(cpu); 2861145256Sjkoshy 2862145256Sjkoshy npmc = md->pmd_npmc; 2863145256Sjkoshy 2864145256Sjkoshy pmcinfo_size = npmc * sizeof(struct pmc_info); 2865184214Sdes pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK); 2866145256Sjkoshy 2867145256Sjkoshy p = pmcinfo; 2868145256Sjkoshy 2869145256Sjkoshy for (n = 0; n < md->pmd_npmc; n++, p++) { 2870145256Sjkoshy 2871184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &ari); 2872184802Sjkoshy 2873184802Sjkoshy KASSERT(pcd != NULL, 2874184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 2875184802Sjkoshy 2876184802Sjkoshy if ((error = pcd->pcd_describe(cpu, ari, p, &pm)) != 0) 2877145256Sjkoshy break; 2878145256Sjkoshy 2879145256Sjkoshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 2880145256Sjkoshy p->pm_rowdisp = PMC_DISP_STANDALONE; 2881145256Sjkoshy else if (PMC_ROW_DISP_IS_THREAD(n)) 2882145256Sjkoshy p->pm_rowdisp = PMC_DISP_THREAD; 2883145256Sjkoshy else 2884145256Sjkoshy p->pm_rowdisp = PMC_DISP_FREE; 2885145256Sjkoshy 2886145256Sjkoshy p->pm_ownerpid = -1; 2887145256Sjkoshy 2888145256Sjkoshy if (pm == NULL) /* no PMC associated */ 2889145256Sjkoshy continue; 2890145256Sjkoshy 2891145256Sjkoshy po = pm->pm_owner; 2892145256Sjkoshy 2893145256Sjkoshy KASSERT(po->po_owner != NULL, 2894145256Sjkoshy ("[pmc,%d] pmc_owner had a null proc pointer", 2895145256Sjkoshy __LINE__)); 2896145256Sjkoshy 2897145256Sjkoshy p->pm_ownerpid = po->po_owner->p_pid; 2898145774Sjkoshy p->pm_mode = PMC_TO_MODE(pm); 2899145256Sjkoshy p->pm_event = pm->pm_event; 2900145256Sjkoshy p->pm_flags = pm->pm_flags; 2901145256Sjkoshy 2902145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2903145256Sjkoshy p->pm_reloadcount = 2904145256Sjkoshy pm->pm_sc.pm_reloadcount; 2905145256Sjkoshy } 2906145256Sjkoshy 2907145256Sjkoshy pmc_restore_cpu_binding(&pb); 2908145256Sjkoshy 2909145256Sjkoshy /* now copy out the PMC info collected */ 2910145256Sjkoshy if (error == 0) 2911145256Sjkoshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 2912145256Sjkoshy 2913184205Sdes free(pmcinfo, M_PMC); 2914145256Sjkoshy } 2915145256Sjkoshy break; 2916145256Sjkoshy 2917145256Sjkoshy 2918145256Sjkoshy /* 2919145256Sjkoshy * Set the administrative state of a PMC. I.e. whether 2920145256Sjkoshy * the PMC is to be used or not. 2921145256Sjkoshy */ 2922145256Sjkoshy 2923145256Sjkoshy case PMC_OP_PMCADMIN: 2924145256Sjkoshy { 2925145256Sjkoshy int cpu, ri; 2926145256Sjkoshy enum pmc_state request; 2927145256Sjkoshy struct pmc_cpu *pc; 2928145256Sjkoshy struct pmc_hw *phw; 2929145256Sjkoshy struct pmc_op_pmcadmin pma; 2930145256Sjkoshy struct pmc_binding pb; 2931145256Sjkoshy 2932145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2933145256Sjkoshy 2934145256Sjkoshy KASSERT(td == curthread, 2935145256Sjkoshy ("[pmc,%d] td != curthread", __LINE__)); 2936145256Sjkoshy 2937164033Srwatson error = priv_check(td, PRIV_PMC_MANAGE); 2938164033Srwatson if (error) 2939145256Sjkoshy break; 2940145256Sjkoshy 2941145256Sjkoshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 2942145256Sjkoshy break; 2943145256Sjkoshy 2944145256Sjkoshy cpu = pma.pm_cpu; 2945145256Sjkoshy 2946183266Sjkoshy if (cpu < 0 || cpu >= (int) pmc_cpu_max()) { 2947145256Sjkoshy error = EINVAL; 2948145256Sjkoshy break; 2949145256Sjkoshy } 2950145256Sjkoshy 2951183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 2952145256Sjkoshy error = ENXIO; 2953145256Sjkoshy break; 2954145256Sjkoshy } 2955145256Sjkoshy 2956145256Sjkoshy request = pma.pm_state; 2957145256Sjkoshy 2958145256Sjkoshy if (request != PMC_STATE_DISABLED && 2959145256Sjkoshy request != PMC_STATE_FREE) { 2960145256Sjkoshy error = EINVAL; 2961145256Sjkoshy break; 2962145256Sjkoshy } 2963145256Sjkoshy 2964145256Sjkoshy ri = pma.pm_pmc; /* pmc id == row index */ 2965145256Sjkoshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 2966145256Sjkoshy error = EINVAL; 2967145256Sjkoshy break; 2968145256Sjkoshy } 2969145256Sjkoshy 2970145256Sjkoshy /* 2971145256Sjkoshy * We can't disable a PMC with a row-index allocated 2972145256Sjkoshy * for process virtual PMCs. 2973145256Sjkoshy */ 2974145256Sjkoshy 2975145256Sjkoshy if (PMC_ROW_DISP_IS_THREAD(ri) && 2976145256Sjkoshy request == PMC_STATE_DISABLED) { 2977145256Sjkoshy error = EBUSY; 2978145256Sjkoshy break; 2979145256Sjkoshy } 2980145256Sjkoshy 2981145256Sjkoshy /* 2982145256Sjkoshy * otherwise, this PMC on this CPU is either free or 2983145256Sjkoshy * in system-wide mode. 2984145256Sjkoshy */ 2985145256Sjkoshy 2986145256Sjkoshy pmc_save_cpu_binding(&pb); 2987145256Sjkoshy pmc_select_cpu(cpu); 2988145256Sjkoshy 2989145256Sjkoshy pc = pmc_pcpu[cpu]; 2990145256Sjkoshy phw = pc->pc_hwpmcs[ri]; 2991145256Sjkoshy 2992145256Sjkoshy /* 2993145256Sjkoshy * XXX do we need some kind of 'forced' disable? 2994145256Sjkoshy */ 2995145256Sjkoshy 2996145256Sjkoshy if (phw->phw_pmc == NULL) { 2997145256Sjkoshy if (request == PMC_STATE_DISABLED && 2998145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 2999145256Sjkoshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 3000145256Sjkoshy PMC_MARK_ROW_STANDALONE(ri); 3001145256Sjkoshy } else if (request == PMC_STATE_FREE && 3002145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 3003145256Sjkoshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 3004145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 3005145256Sjkoshy } 3006145256Sjkoshy /* other cases are a no-op */ 3007145256Sjkoshy } else 3008145256Sjkoshy error = EBUSY; 3009145256Sjkoshy 3010145256Sjkoshy pmc_restore_cpu_binding(&pb); 3011145256Sjkoshy } 3012145256Sjkoshy break; 3013145256Sjkoshy 3014145256Sjkoshy 3015145256Sjkoshy /* 3016145256Sjkoshy * Allocate a PMC. 3017145256Sjkoshy */ 3018145256Sjkoshy 3019145256Sjkoshy case PMC_OP_PMCALLOCATE: 3020145256Sjkoshy { 3021184802Sjkoshy int adjri, n; 3022184802Sjkoshy u_int cpu; 3023145256Sjkoshy uint32_t caps; 3024184802Sjkoshy struct pmc *pmc; 3025145256Sjkoshy enum pmc_mode mode; 3026145774Sjkoshy struct pmc_hw *phw; 3027184802Sjkoshy struct pmc_binding pb; 3028184802Sjkoshy struct pmc_classdep *pcd; 3029145256Sjkoshy struct pmc_op_pmcallocate pa; 3030145256Sjkoshy 3031145256Sjkoshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 3032145256Sjkoshy break; 3033145256Sjkoshy 3034145256Sjkoshy caps = pa.pm_caps; 3035145256Sjkoshy mode = pa.pm_mode; 3036145256Sjkoshy cpu = pa.pm_cpu; 3037145256Sjkoshy 3038145256Sjkoshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 3039145256Sjkoshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 3040183266Sjkoshy (cpu != (u_int) PMC_CPU_ANY && cpu >= pmc_cpu_max())) { 3041145256Sjkoshy error = EINVAL; 3042145256Sjkoshy break; 3043145256Sjkoshy } 3044145256Sjkoshy 3045145256Sjkoshy /* 3046145256Sjkoshy * Virtual PMCs should only ask for a default CPU. 3047145256Sjkoshy * System mode PMCs need to specify a non-default CPU. 3048145256Sjkoshy */ 3049145256Sjkoshy 3050145256Sjkoshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 3051145256Sjkoshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 3052145256Sjkoshy error = EINVAL; 3053145256Sjkoshy break; 3054145256Sjkoshy } 3055145256Sjkoshy 3056145256Sjkoshy /* 3057183266Sjkoshy * Check that an inactive CPU is not being asked for. 3058145256Sjkoshy */ 3059145256Sjkoshy 3060183266Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && !pmc_cpu_is_active(cpu)) { 3061145256Sjkoshy error = ENXIO; 3062145256Sjkoshy break; 3063145256Sjkoshy } 3064145256Sjkoshy 3065145256Sjkoshy /* 3066145256Sjkoshy * Refuse an allocation for a system-wide PMC if this 3067145256Sjkoshy * process has been jailed, or if this process lacks 3068145256Sjkoshy * super-user credentials and the sysctl tunable 3069145256Sjkoshy * 'security.bsd.unprivileged_syspmcs' is zero. 3070145256Sjkoshy */ 3071145256Sjkoshy 3072145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3073164033Srwatson if (jailed(curthread->td_ucred)) { 3074145256Sjkoshy error = EPERM; 3075164033Srwatson break; 3076164033Srwatson } 3077164033Srwatson if (!pmc_unprivileged_syspmcs) { 3078164033Srwatson error = priv_check(curthread, 3079164033Srwatson PRIV_PMC_SYSTEM); 3080164033Srwatson if (error) 3081164033Srwatson break; 3082164033Srwatson } 3083145256Sjkoshy } 3084145256Sjkoshy 3085145256Sjkoshy if (error) 3086145256Sjkoshy break; 3087145256Sjkoshy 3088145256Sjkoshy /* 3089145256Sjkoshy * Look for valid values for 'pm_flags' 3090145256Sjkoshy */ 3091145256Sjkoshy 3092147191Sjkoshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 3093174395Sjkoshy PMC_F_LOG_PROCEXIT | PMC_F_CALLCHAIN)) != 0) { 3094145256Sjkoshy error = EINVAL; 3095145256Sjkoshy break; 3096145256Sjkoshy } 3097145256Sjkoshy 3098147191Sjkoshy /* process logging options are not allowed for system PMCs */ 3099147191Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 3100147191Sjkoshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 3101147191Sjkoshy error = EINVAL; 3102147191Sjkoshy break; 3103147191Sjkoshy } 3104147191Sjkoshy 3105145256Sjkoshy /* 3106145256Sjkoshy * All sampling mode PMCs need to be able to interrupt the 3107145256Sjkoshy * CPU. 3108145256Sjkoshy */ 3109147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode)) 3110145256Sjkoshy caps |= PMC_CAP_INTERRUPT; 3111145256Sjkoshy 3112149374Sjkoshy /* A valid class specifier should have been passed in. */ 3113149374Sjkoshy for (n = 0; n < md->pmd_nclass; n++) 3114184802Sjkoshy if (md->pmd_classdep[n].pcd_class == pa.pm_class) 3115149374Sjkoshy break; 3116149374Sjkoshy if (n == md->pmd_nclass) { 3117149374Sjkoshy error = EINVAL; 3118149374Sjkoshy break; 3119149374Sjkoshy } 3120149374Sjkoshy 3121149374Sjkoshy /* The requested PMC capabilities should be feasible. */ 3122184802Sjkoshy if ((md->pmd_classdep[n].pcd_caps & caps) != caps) { 3123149374Sjkoshy error = EOPNOTSUPP; 3124149374Sjkoshy break; 3125149374Sjkoshy } 3126149374Sjkoshy 3127145256Sjkoshy PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 3128145256Sjkoshy pa.pm_ev, caps, mode, cpu); 3129145256Sjkoshy 3130145256Sjkoshy pmc = pmc_allocate_pmc_descriptor(); 3131145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 3132145774Sjkoshy PMC_ID_INVALID); 3133145256Sjkoshy pmc->pm_event = pa.pm_ev; 3134145256Sjkoshy pmc->pm_state = PMC_STATE_FREE; 3135145256Sjkoshy pmc->pm_caps = caps; 3136145256Sjkoshy pmc->pm_flags = pa.pm_flags; 3137145256Sjkoshy 3138145256Sjkoshy /* switch thread to CPU 'cpu' */ 3139145256Sjkoshy pmc_save_cpu_binding(&pb); 3140145256Sjkoshy 3141145256Sjkoshy#define PMC_IS_SHAREABLE_PMC(cpu, n) \ 3142145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 3143145256Sjkoshy PMC_PHW_FLAG_IS_SHAREABLE) 3144145256Sjkoshy#define PMC_IS_UNALLOCATED(cpu, n) \ 3145145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 3146145256Sjkoshy 3147145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3148145256Sjkoshy pmc_select_cpu(cpu); 3149184802Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3150184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3151145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3152145256Sjkoshy pmc_can_allocate_rowindex( 3153145774Sjkoshy curthread->td_proc, n, cpu) == 0 && 3154145256Sjkoshy (PMC_IS_UNALLOCATED(cpu, n) || 3155145256Sjkoshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 3156184802Sjkoshy pcd->pcd_allocate_pmc(cpu, adjri, pmc, 3157145256Sjkoshy &pa) == 0) 3158145256Sjkoshy break; 3159184802Sjkoshy } 3160145256Sjkoshy } else { 3161145256Sjkoshy /* Process virtual mode */ 3162145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3163184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3164145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3165145256Sjkoshy pmc_can_allocate_rowindex( 3166145774Sjkoshy curthread->td_proc, n, 3167145774Sjkoshy PMC_CPU_ANY) == 0 && 3168184802Sjkoshy pcd->pcd_allocate_pmc(curthread->td_oncpu, 3169184802Sjkoshy adjri, pmc, &pa) == 0) 3170145256Sjkoshy break; 3171145256Sjkoshy } 3172145256Sjkoshy } 3173145256Sjkoshy 3174145256Sjkoshy#undef PMC_IS_UNALLOCATED 3175145256Sjkoshy#undef PMC_IS_SHAREABLE_PMC 3176145256Sjkoshy 3177145256Sjkoshy pmc_restore_cpu_binding(&pb); 3178145256Sjkoshy 3179145256Sjkoshy if (n == (int) md->pmd_npmc) { 3180145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3181184205Sdes free(pmc, M_PMC); 3182145256Sjkoshy pmc = NULL; 3183145256Sjkoshy error = EINVAL; 3184145256Sjkoshy break; 3185145256Sjkoshy } 3186145256Sjkoshy 3187145774Sjkoshy /* Fill in the correct value in the ID field */ 3188145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 3189145256Sjkoshy 3190145774Sjkoshy PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 3191145774Sjkoshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 3192145774Sjkoshy 3193147191Sjkoshy /* Process mode PMCs with logging enabled need log files */ 3194147191Sjkoshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 3195147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3196147191Sjkoshy 3197147191Sjkoshy /* All system mode sampling PMCs require a log file */ 3198147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 3199147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3200147191Sjkoshy 3201145256Sjkoshy /* 3202145256Sjkoshy * Configure global pmc's immediately 3203145256Sjkoshy */ 3204145256Sjkoshy 3205145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 3206145774Sjkoshy 3207145774Sjkoshy pmc_save_cpu_binding(&pb); 3208145774Sjkoshy pmc_select_cpu(cpu); 3209145774Sjkoshy 3210145774Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 3211184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3212145774Sjkoshy 3213145774Sjkoshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 3214184802Sjkoshy (error = pcd->pcd_config_pmc(cpu, adjri, pmc)) != 0) { 3215184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pmc); 3216145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3217184205Sdes free(pmc, M_PMC); 3218145256Sjkoshy pmc = NULL; 3219145774Sjkoshy pmc_restore_cpu_binding(&pb); 3220145774Sjkoshy error = EPERM; 3221145256Sjkoshy break; 3222145256Sjkoshy } 3223145256Sjkoshy 3224145774Sjkoshy pmc_restore_cpu_binding(&pb); 3225145774Sjkoshy } 3226145256Sjkoshy 3227145256Sjkoshy pmc->pm_state = PMC_STATE_ALLOCATED; 3228145256Sjkoshy 3229145256Sjkoshy /* 3230145256Sjkoshy * mark row disposition 3231145256Sjkoshy */ 3232145256Sjkoshy 3233145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 3234145256Sjkoshy PMC_MARK_ROW_STANDALONE(n); 3235145256Sjkoshy else 3236145256Sjkoshy PMC_MARK_ROW_THREAD(n); 3237145256Sjkoshy 3238145256Sjkoshy /* 3239145256Sjkoshy * Register this PMC with the current thread as its owner. 3240145256Sjkoshy */ 3241145256Sjkoshy 3242145256Sjkoshy if ((error = 3243145256Sjkoshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 3244145256Sjkoshy pmc_release_pmc_descriptor(pmc); 3245184205Sdes free(pmc, M_PMC); 3246145256Sjkoshy pmc = NULL; 3247145256Sjkoshy break; 3248145256Sjkoshy } 3249145256Sjkoshy 3250145256Sjkoshy /* 3251145256Sjkoshy * Return the allocated index. 3252145256Sjkoshy */ 3253145256Sjkoshy 3254145774Sjkoshy pa.pm_pmcid = pmc->pm_id; 3255145256Sjkoshy 3256145256Sjkoshy error = copyout(&pa, arg, sizeof(pa)); 3257145256Sjkoshy } 3258145256Sjkoshy break; 3259145256Sjkoshy 3260145256Sjkoshy 3261145256Sjkoshy /* 3262145256Sjkoshy * Attach a PMC to a process. 3263145256Sjkoshy */ 3264145256Sjkoshy 3265145256Sjkoshy case PMC_OP_PMCATTACH: 3266145256Sjkoshy { 3267145256Sjkoshy struct pmc *pm; 3268145256Sjkoshy struct proc *p; 3269145256Sjkoshy struct pmc_op_pmcattach a; 3270145256Sjkoshy 3271145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3272145256Sjkoshy 3273145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3274145256Sjkoshy break; 3275145256Sjkoshy 3276145256Sjkoshy if (a.pm_pid < 0) { 3277145256Sjkoshy error = EINVAL; 3278145256Sjkoshy break; 3279145256Sjkoshy } else if (a.pm_pid == 0) 3280145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3281145256Sjkoshy 3282145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3283145256Sjkoshy break; 3284145256Sjkoshy 3285145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 3286145256Sjkoshy error = EINVAL; 3287145256Sjkoshy break; 3288145256Sjkoshy } 3289145256Sjkoshy 3290145256Sjkoshy /* PMCs may be (re)attached only when allocated or stopped */ 3291145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3292145256Sjkoshy error = EBUSY; 3293145256Sjkoshy break; 3294145256Sjkoshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 3295145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED) { 3296145256Sjkoshy error = EINVAL; 3297145256Sjkoshy break; 3298145256Sjkoshy } 3299145256Sjkoshy 3300145256Sjkoshy /* lookup pid */ 3301145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3302145256Sjkoshy error = ESRCH; 3303145256Sjkoshy break; 3304145256Sjkoshy } 3305145256Sjkoshy 3306145256Sjkoshy /* 3307145256Sjkoshy * Ignore processes that are working on exiting. 3308145256Sjkoshy */ 3309145256Sjkoshy if (p->p_flag & P_WEXIT) { 3310145256Sjkoshy error = ESRCH; 3311145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3312145256Sjkoshy break; 3313145256Sjkoshy } 3314145256Sjkoshy 3315145256Sjkoshy /* 3316145256Sjkoshy * we are allowed to attach a PMC to a process if 3317145256Sjkoshy * we can debug it. 3318145256Sjkoshy */ 3319145256Sjkoshy error = p_candebug(curthread, p); 3320145256Sjkoshy 3321145256Sjkoshy PROC_UNLOCK(p); 3322145256Sjkoshy 3323145256Sjkoshy if (error == 0) 3324145256Sjkoshy error = pmc_attach_process(p, pm); 3325145256Sjkoshy } 3326145256Sjkoshy break; 3327145256Sjkoshy 3328145256Sjkoshy 3329145256Sjkoshy /* 3330145256Sjkoshy * Detach an attached PMC from a process. 3331145256Sjkoshy */ 3332145256Sjkoshy 3333145256Sjkoshy case PMC_OP_PMCDETACH: 3334145256Sjkoshy { 3335145256Sjkoshy struct pmc *pm; 3336145256Sjkoshy struct proc *p; 3337145256Sjkoshy struct pmc_op_pmcattach a; 3338145256Sjkoshy 3339145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3340145256Sjkoshy break; 3341145256Sjkoshy 3342145256Sjkoshy if (a.pm_pid < 0) { 3343145256Sjkoshy error = EINVAL; 3344145256Sjkoshy break; 3345145256Sjkoshy } else if (a.pm_pid == 0) 3346145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3347145256Sjkoshy 3348145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3349145256Sjkoshy break; 3350145256Sjkoshy 3351145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3352145256Sjkoshy error = ESRCH; 3353145256Sjkoshy break; 3354145256Sjkoshy } 3355145256Sjkoshy 3356145256Sjkoshy /* 3357145256Sjkoshy * Treat processes that are in the process of exiting 3358145256Sjkoshy * as if they were not present. 3359145256Sjkoshy */ 3360145256Sjkoshy 3361145256Sjkoshy if (p->p_flag & P_WEXIT) 3362145256Sjkoshy error = ESRCH; 3363145256Sjkoshy 3364145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3365145256Sjkoshy 3366145256Sjkoshy if (error == 0) 3367145256Sjkoshy error = pmc_detach_process(p, pm); 3368145256Sjkoshy } 3369145256Sjkoshy break; 3370145256Sjkoshy 3371145256Sjkoshy 3372145256Sjkoshy /* 3373147191Sjkoshy * Retrieve the MSR number associated with the counter 3374147191Sjkoshy * 'pmc_id'. This allows processes to directly use RDPMC 3375147191Sjkoshy * instructions to read their PMCs, without the overhead of a 3376147191Sjkoshy * system call. 3377147191Sjkoshy */ 3378147191Sjkoshy 3379147191Sjkoshy case PMC_OP_PMCGETMSR: 3380147191Sjkoshy { 3381184802Sjkoshy int adjri, ri; 3382184802Sjkoshy struct pmc *pm; 3383147191Sjkoshy struct pmc_target *pt; 3384147191Sjkoshy struct pmc_op_getmsr gm; 3385184802Sjkoshy struct pmc_classdep *pcd; 3386147191Sjkoshy 3387147191Sjkoshy PMC_DOWNGRADE_SX(); 3388147191Sjkoshy 3389147191Sjkoshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3390147191Sjkoshy break; 3391147191Sjkoshy 3392147191Sjkoshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3393147191Sjkoshy break; 3394147191Sjkoshy 3395147191Sjkoshy /* 3396147191Sjkoshy * The allocated PMC has to be a process virtual PMC, 3397147191Sjkoshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3398147191Sjkoshy * read using the PMCREAD operation since they may be 3399147191Sjkoshy * allocated on a different CPU than the one we could 3400147191Sjkoshy * be running on at the time of the RDPMC instruction. 3401147191Sjkoshy * 3402147191Sjkoshy * The GETMSR operation is not allowed for PMCs that 3403147191Sjkoshy * are inherited across processes. 3404147191Sjkoshy */ 3405147191Sjkoshy 3406147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3407147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3408147191Sjkoshy error = EINVAL; 3409147191Sjkoshy break; 3410147191Sjkoshy } 3411147191Sjkoshy 3412147191Sjkoshy /* 3413147191Sjkoshy * It only makes sense to use a RDPMC (or its 3414147191Sjkoshy * equivalent instruction on non-x86 architectures) on 3415147191Sjkoshy * a process that has allocated and attached a PMC to 3416147191Sjkoshy * itself. Conversely the PMC is only allowed to have 3417147191Sjkoshy * one process attached to it -- its owner. 3418147191Sjkoshy */ 3419147191Sjkoshy 3420147191Sjkoshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3421147191Sjkoshy LIST_NEXT(pt, pt_next) != NULL || 3422147191Sjkoshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3423147191Sjkoshy error = EINVAL; 3424147191Sjkoshy break; 3425147191Sjkoshy } 3426147191Sjkoshy 3427147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3428184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3429147191Sjkoshy 3430184802Sjkoshy /* PMC class has no 'GETMSR' support */ 3431184802Sjkoshy if (pcd->pcd_get_msr == NULL) { 3432184802Sjkoshy error = ENOSYS; 3433147191Sjkoshy break; 3434184802Sjkoshy } 3435147191Sjkoshy 3436184802Sjkoshy if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) < 0) 3437184802Sjkoshy break; 3438184802Sjkoshy 3439147191Sjkoshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3440147191Sjkoshy break; 3441147191Sjkoshy 3442147191Sjkoshy /* 3443147191Sjkoshy * Mark our process as using MSRs. Update machine 3444147191Sjkoshy * state using a forced context switch. 3445147191Sjkoshy */ 3446147191Sjkoshy 3447147191Sjkoshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3448147191Sjkoshy pmc_force_context_switch(); 3449147191Sjkoshy 3450147191Sjkoshy } 3451147191Sjkoshy break; 3452147191Sjkoshy 3453147191Sjkoshy /* 3454145256Sjkoshy * Release an allocated PMC 3455145256Sjkoshy */ 3456145256Sjkoshy 3457145256Sjkoshy case PMC_OP_PMCRELEASE: 3458145256Sjkoshy { 3459145256Sjkoshy pmc_id_t pmcid; 3460145256Sjkoshy struct pmc *pm; 3461145256Sjkoshy struct pmc_owner *po; 3462145256Sjkoshy struct pmc_op_simple sp; 3463145256Sjkoshy 3464145256Sjkoshy /* 3465145256Sjkoshy * Find PMC pointer for the named PMC. 3466145256Sjkoshy * 3467145256Sjkoshy * Use pmc_release_pmc_descriptor() to switch off the 3468145256Sjkoshy * PMC, remove all its target threads, and remove the 3469145256Sjkoshy * PMC from its owner's list. 3470145256Sjkoshy * 3471145256Sjkoshy * Remove the owner record if this is the last PMC 3472145256Sjkoshy * owned. 3473145256Sjkoshy * 3474145256Sjkoshy * Free up space. 3475145256Sjkoshy */ 3476145256Sjkoshy 3477145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3478145256Sjkoshy break; 3479145256Sjkoshy 3480145256Sjkoshy pmcid = sp.pm_pmcid; 3481145256Sjkoshy 3482145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3483145256Sjkoshy break; 3484145256Sjkoshy 3485145256Sjkoshy po = pm->pm_owner; 3486145256Sjkoshy pmc_release_pmc_descriptor(pm); 3487145256Sjkoshy pmc_maybe_remove_owner(po); 3488145256Sjkoshy 3489184205Sdes free(pm, M_PMC); 3490145256Sjkoshy } 3491145256Sjkoshy break; 3492145256Sjkoshy 3493145256Sjkoshy 3494145256Sjkoshy /* 3495145256Sjkoshy * Read and/or write a PMC. 3496145256Sjkoshy */ 3497145256Sjkoshy 3498145256Sjkoshy case PMC_OP_PMCRW: 3499145256Sjkoshy { 3500184802Sjkoshy int adjri; 3501184802Sjkoshy struct pmc *pm; 3502145256Sjkoshy uint32_t cpu, ri; 3503184802Sjkoshy pmc_value_t oldvalue; 3504184802Sjkoshy struct pmc_binding pb; 3505184802Sjkoshy struct pmc_op_pmcrw prw; 3506184802Sjkoshy struct pmc_classdep *pcd; 3507145256Sjkoshy struct pmc_op_pmcrw *pprw; 3508145256Sjkoshy 3509145256Sjkoshy PMC_DOWNGRADE_SX(); 3510145256Sjkoshy 3511145256Sjkoshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3512145256Sjkoshy break; 3513145256Sjkoshy 3514145301Simp ri = 0; 3515145256Sjkoshy PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3516145256Sjkoshy prw.pm_flags); 3517145256Sjkoshy 3518145256Sjkoshy /* must have at least one flag set */ 3519145256Sjkoshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3520145256Sjkoshy error = EINVAL; 3521145256Sjkoshy break; 3522145256Sjkoshy } 3523145256Sjkoshy 3524145256Sjkoshy /* locate pmc descriptor */ 3525145256Sjkoshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3526145256Sjkoshy break; 3527145256Sjkoshy 3528145256Sjkoshy /* Can't read a PMC that hasn't been started. */ 3529145256Sjkoshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3530145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED && 3531145256Sjkoshy pm->pm_state != PMC_STATE_RUNNING) { 3532145256Sjkoshy error = EINVAL; 3533145256Sjkoshy break; 3534145256Sjkoshy } 3535145256Sjkoshy 3536145256Sjkoshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3537145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3538145256Sjkoshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3539145256Sjkoshy error = EBUSY; 3540145256Sjkoshy break; 3541145256Sjkoshy } 3542145256Sjkoshy 3543145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3544145256Sjkoshy 3545145774Sjkoshy /* 3546145774Sjkoshy * If this PMC is attached to its owner (i.e., 3547145774Sjkoshy * the process requesting this operation) and 3548145774Sjkoshy * is running, then attempt to get an 3549145774Sjkoshy * upto-date reading from hardware for a READ. 3550145774Sjkoshy * Writes are only allowed when the PMC is 3551145774Sjkoshy * stopped, so only update the saved value 3552145774Sjkoshy * field. 3553145774Sjkoshy * 3554145774Sjkoshy * If the PMC is not running, or is not 3555145774Sjkoshy * attached to its owner, read/write to the 3556145774Sjkoshy * savedvalue field. 3557145774Sjkoshy */ 3558145774Sjkoshy 3559145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3560184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3561145774Sjkoshy 3562145256Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3563145774Sjkoshy cpu = curthread->td_oncpu; 3564145774Sjkoshy 3565145774Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3566145774Sjkoshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3567145774Sjkoshy (pm->pm_state == PMC_STATE_RUNNING)) 3568184802Sjkoshy error = (*pcd->pcd_read_pmc)(cpu, adjri, 3569145774Sjkoshy &oldvalue); 3570145774Sjkoshy else 3571145774Sjkoshy oldvalue = pm->pm_gv.pm_savedvalue; 3572145774Sjkoshy } 3573145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3574145256Sjkoshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3575145774Sjkoshy 3576145256Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3577145256Sjkoshy 3578145256Sjkoshy } else { /* System mode PMCs */ 3579145774Sjkoshy cpu = PMC_TO_CPU(pm); 3580145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3581184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3582145256Sjkoshy 3583183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3584145256Sjkoshy error = ENXIO; 3585145256Sjkoshy break; 3586145256Sjkoshy } 3587145256Sjkoshy 3588145256Sjkoshy /* move this thread to CPU 'cpu' */ 3589145256Sjkoshy pmc_save_cpu_binding(&pb); 3590145256Sjkoshy pmc_select_cpu(cpu); 3591145256Sjkoshy 3592145774Sjkoshy critical_enter(); 3593145256Sjkoshy /* save old value */ 3594145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3595184802Sjkoshy if ((error = (*pcd->pcd_read_pmc)(cpu, adjri, 3596145256Sjkoshy &oldvalue))) 3597145256Sjkoshy goto error; 3598145256Sjkoshy /* write out new value */ 3599145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3600184802Sjkoshy error = (*pcd->pcd_write_pmc)(cpu, adjri, 3601145256Sjkoshy prw.pm_value); 3602145256Sjkoshy error: 3603145774Sjkoshy critical_exit(); 3604145256Sjkoshy pmc_restore_cpu_binding(&pb); 3605145256Sjkoshy if (error) 3606145256Sjkoshy break; 3607145256Sjkoshy } 3608145256Sjkoshy 3609145256Sjkoshy pprw = (struct pmc_op_pmcrw *) arg; 3610145256Sjkoshy 3611153110Sru#ifdef DEBUG 3612145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3613145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3614145256Sjkoshy ri, prw.pm_value, oldvalue); 3615156778Sjkoshy else if (prw.pm_flags & PMC_F_OLDVALUE) 3616145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3617145256Sjkoshy#endif 3618145256Sjkoshy 3619145256Sjkoshy /* return old value if requested */ 3620145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3621145256Sjkoshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3622145256Sjkoshy sizeof(prw.pm_value)))) 3623145256Sjkoshy break; 3624145256Sjkoshy 3625145256Sjkoshy } 3626145256Sjkoshy break; 3627145256Sjkoshy 3628145256Sjkoshy 3629145256Sjkoshy /* 3630145256Sjkoshy * Set the sampling rate for a sampling mode PMC and the 3631145256Sjkoshy * initial count for a counting mode PMC. 3632145256Sjkoshy */ 3633145256Sjkoshy 3634145256Sjkoshy case PMC_OP_PMCSETCOUNT: 3635145256Sjkoshy { 3636145256Sjkoshy struct pmc *pm; 3637145256Sjkoshy struct pmc_op_pmcsetcount sc; 3638145256Sjkoshy 3639145256Sjkoshy PMC_DOWNGRADE_SX(); 3640145256Sjkoshy 3641145256Sjkoshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3642145256Sjkoshy break; 3643145256Sjkoshy 3644145256Sjkoshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3645145256Sjkoshy break; 3646145256Sjkoshy 3647145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3648145256Sjkoshy error = EBUSY; 3649145256Sjkoshy break; 3650145256Sjkoshy } 3651145256Sjkoshy 3652145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3653145256Sjkoshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3654145256Sjkoshy else 3655145256Sjkoshy pm->pm_sc.pm_initial = sc.pm_count; 3656145256Sjkoshy } 3657145256Sjkoshy break; 3658145256Sjkoshy 3659145256Sjkoshy 3660145256Sjkoshy /* 3661145256Sjkoshy * Start a PMC. 3662145256Sjkoshy */ 3663145256Sjkoshy 3664145256Sjkoshy case PMC_OP_PMCSTART: 3665145256Sjkoshy { 3666145256Sjkoshy pmc_id_t pmcid; 3667145256Sjkoshy struct pmc *pm; 3668145256Sjkoshy struct pmc_op_simple sp; 3669145256Sjkoshy 3670145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3671145256Sjkoshy 3672145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3673145256Sjkoshy break; 3674145256Sjkoshy 3675145256Sjkoshy pmcid = sp.pm_pmcid; 3676145256Sjkoshy 3677145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3678145256Sjkoshy break; 3679145256Sjkoshy 3680145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3681145774Sjkoshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3682145774Sjkoshy pm->pm_id, pmcid)); 3683145256Sjkoshy 3684145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3685145256Sjkoshy break; 3686145256Sjkoshy else if (pm->pm_state != PMC_STATE_STOPPED && 3687145256Sjkoshy pm->pm_state != PMC_STATE_ALLOCATED) { 3688145256Sjkoshy error = EINVAL; 3689145256Sjkoshy break; 3690145256Sjkoshy } 3691145256Sjkoshy 3692145256Sjkoshy error = pmc_start(pm); 3693145256Sjkoshy } 3694145256Sjkoshy break; 3695145256Sjkoshy 3696145256Sjkoshy 3697145256Sjkoshy /* 3698145256Sjkoshy * Stop a PMC. 3699145256Sjkoshy */ 3700145256Sjkoshy 3701145256Sjkoshy case PMC_OP_PMCSTOP: 3702145256Sjkoshy { 3703145256Sjkoshy pmc_id_t pmcid; 3704145256Sjkoshy struct pmc *pm; 3705145256Sjkoshy struct pmc_op_simple sp; 3706145256Sjkoshy 3707145256Sjkoshy PMC_DOWNGRADE_SX(); 3708145256Sjkoshy 3709145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3710145256Sjkoshy break; 3711145256Sjkoshy 3712145256Sjkoshy pmcid = sp.pm_pmcid; 3713145256Sjkoshy 3714145256Sjkoshy /* 3715145256Sjkoshy * Mark the PMC as inactive and invoke the MD stop 3716145256Sjkoshy * routines if needed. 3717145256Sjkoshy */ 3718145256Sjkoshy 3719145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3720145256Sjkoshy break; 3721145256Sjkoshy 3722145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3723145774Sjkoshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3724145774Sjkoshy pm->pm_id, pmcid)); 3725145256Sjkoshy 3726145256Sjkoshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3727145256Sjkoshy break; 3728145256Sjkoshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3729145256Sjkoshy error = EINVAL; 3730145256Sjkoshy break; 3731145256Sjkoshy } 3732145256Sjkoshy 3733145256Sjkoshy error = pmc_stop(pm); 3734145256Sjkoshy } 3735145256Sjkoshy break; 3736145256Sjkoshy 3737145256Sjkoshy 3738145256Sjkoshy /* 3739147867Sjkoshy * Write a user supplied value to the log file. 3740145256Sjkoshy */ 3741145256Sjkoshy 3742145256Sjkoshy case PMC_OP_WRITELOG: 3743145256Sjkoshy { 3744147191Sjkoshy struct pmc_op_writelog wl; 3745147191Sjkoshy struct pmc_owner *po; 3746145256Sjkoshy 3747145256Sjkoshy PMC_DOWNGRADE_SX(); 3748145256Sjkoshy 3749147191Sjkoshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 3750145256Sjkoshy break; 3751145256Sjkoshy 3752147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3753145256Sjkoshy error = EINVAL; 3754145256Sjkoshy break; 3755145256Sjkoshy } 3756145256Sjkoshy 3757147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 3758145774Sjkoshy error = EINVAL; 3759145774Sjkoshy break; 3760145774Sjkoshy } 3761145774Sjkoshy 3762147191Sjkoshy error = pmclog_process_userlog(po, &wl); 3763145256Sjkoshy } 3764145256Sjkoshy break; 3765145256Sjkoshy 3766147191Sjkoshy 3767145256Sjkoshy default: 3768145256Sjkoshy error = EINVAL; 3769145256Sjkoshy break; 3770145256Sjkoshy } 3771145256Sjkoshy 3772145256Sjkoshy if (is_sx_downgraded) 3773145256Sjkoshy sx_sunlock(&pmc_sx); 3774145256Sjkoshy else 3775145256Sjkoshy sx_xunlock(&pmc_sx); 3776145256Sjkoshy 3777145256Sjkoshy if (error) 3778145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 3779145256Sjkoshy 3780147191Sjkoshy PICKUP_GIANT(); 3781147191Sjkoshy 3782145256Sjkoshy return error; 3783145256Sjkoshy} 3784145256Sjkoshy 3785145256Sjkoshy/* 3786145256Sjkoshy * Helper functions 3787145256Sjkoshy */ 3788145256Sjkoshy 3789147191Sjkoshy 3790145256Sjkoshy/* 3791174395Sjkoshy * Mark the thread as needing callchain capture and post an AST. The 3792174395Sjkoshy * actual callchain capture will be done in a context where it is safe 3793174395Sjkoshy * to take page faults. 3794174395Sjkoshy */ 3795174395Sjkoshy 3796174395Sjkoshystatic void 3797174395Sjkoshypmc_post_callchain_ast(void) 3798174395Sjkoshy{ 3799174395Sjkoshy struct thread *td; 3800174395Sjkoshy 3801174395Sjkoshy td = curthread; 3802174395Sjkoshy 3803174395Sjkoshy /* 3804174395Sjkoshy * Mark this thread as needing processing in ast(). 3805174395Sjkoshy * td->td_pflags will be safe to touch as the process was in 3806174395Sjkoshy * user space when it was interrupted. 3807174395Sjkoshy */ 3808174395Sjkoshy td->td_pflags |= TDP_CALLCHAIN; 3809174395Sjkoshy 3810174395Sjkoshy /* 3811174395Sjkoshy * Again, since we've entered this function directly from 3812174395Sjkoshy * userland, `td' is guaranteed to be not locked by this CPU, 3813174395Sjkoshy * so its safe to try acquire the thread lock even though we 3814174395Sjkoshy * are executing in an NMI context. We need to acquire this 3815174395Sjkoshy * lock before touching `td_flags' because other CPUs may be 3816174395Sjkoshy * in the process of touching this field. 3817174395Sjkoshy */ 3818174395Sjkoshy thread_lock(td); 3819174395Sjkoshy td->td_flags |= TDF_ASTPENDING; 3820174395Sjkoshy thread_unlock(td); 3821174395Sjkoshy 3822174395Sjkoshy return; 3823174395Sjkoshy} 3824174395Sjkoshy 3825174395Sjkoshy/* 3826147191Sjkoshy * Interrupt processing. 3827147191Sjkoshy * 3828174395Sjkoshy * Find a free slot in the per-cpu array of samples and capture the 3829174395Sjkoshy * current callchain there. If a sample was successfully added, a bit 3830174395Sjkoshy * is set in mask 'pmc_cpumask' denoting that the DO_SAMPLES hook 3831174395Sjkoshy * needs to be invoked from the clock handler. 3832147191Sjkoshy * 3833147191Sjkoshy * This function is meant to be called from an NMI handler. It cannot 3834147191Sjkoshy * use any of the locking primitives supplied by the OS. 3835145256Sjkoshy */ 3836145256Sjkoshy 3837147191Sjkoshyint 3838174395Sjkoshypmc_process_interrupt(int cpu, struct pmc *pm, struct trapframe *tf, 3839174395Sjkoshy int inuserspace) 3840145256Sjkoshy{ 3841174395Sjkoshy int error, callchaindepth; 3842147191Sjkoshy struct thread *td; 3843147191Sjkoshy struct pmc_sample *ps; 3844147191Sjkoshy struct pmc_samplebuffer *psb; 3845145256Sjkoshy 3846147191Sjkoshy error = 0; 3847145256Sjkoshy 3848174395Sjkoshy /* 3849174395Sjkoshy * Allocate space for a sample buffer. 3850174395Sjkoshy */ 3851147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3852145256Sjkoshy 3853147191Sjkoshy ps = psb->ps_write; 3854174395Sjkoshy if (ps->ps_nsamples) { /* in use, reader hasn't caught up */ 3855147867Sjkoshy pm->pm_stalled = 1; 3856147191Sjkoshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 3857174395Sjkoshy PMCDBG(SAM,INT,1,"(spc) cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", 3858174395Sjkoshy cpu, pm, (void *) tf, inuserspace, 3859147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3860147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3861147191Sjkoshy error = ENOMEM; 3862147191Sjkoshy goto done; 3863147191Sjkoshy } 3864145256Sjkoshy 3865174395Sjkoshy 3866174395Sjkoshy /* Fill in entry. */ 3867174395Sjkoshy PMCDBG(SAM,INT,1,"cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", cpu, pm, 3868174395Sjkoshy (void *) tf, inuserspace, 3869147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3870147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3871145256Sjkoshy 3872174395Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); /* hold onto PMC */ 3873147191Sjkoshy ps->ps_pmc = pm; 3874147191Sjkoshy if ((td = curthread) && td->td_proc) 3875147191Sjkoshy ps->ps_pid = td->td_proc->p_pid; 3876147191Sjkoshy else 3877147191Sjkoshy ps->ps_pid = -1; 3878174395Sjkoshy ps->ps_cpu = cpu; 3879174395Sjkoshy ps->ps_flags = inuserspace ? PMC_CC_F_USERSPACE : 0; 3880145256Sjkoshy 3881174395Sjkoshy callchaindepth = (pm->pm_flags & PMC_F_CALLCHAIN) ? 3882174395Sjkoshy pmc_callchaindepth : 1; 3883174395Sjkoshy 3884174395Sjkoshy if (callchaindepth == 1) 3885174395Sjkoshy ps->ps_pc[0] = PMC_TRAPFRAME_TO_PC(tf); 3886174395Sjkoshy else { 3887174395Sjkoshy /* 3888174395Sjkoshy * Kernel stack traversals can be done immediately, 3889174395Sjkoshy * while we defer to an AST for user space traversals. 3890174395Sjkoshy */ 3891174395Sjkoshy if (!inuserspace) 3892174395Sjkoshy callchaindepth = 3893174395Sjkoshy pmc_save_kernel_callchain(ps->ps_pc, 3894174395Sjkoshy callchaindepth, tf); 3895174395Sjkoshy else { 3896174395Sjkoshy pmc_post_callchain_ast(); 3897174395Sjkoshy callchaindepth = PMC_SAMPLE_INUSE; 3898174395Sjkoshy } 3899174395Sjkoshy } 3900174395Sjkoshy 3901174395Sjkoshy ps->ps_nsamples = callchaindepth; /* mark entry as in use */ 3902174395Sjkoshy 3903147191Sjkoshy /* increment write pointer, modulo ring buffer size */ 3904147191Sjkoshy ps++; 3905147191Sjkoshy if (ps == psb->ps_fence) 3906147191Sjkoshy psb->ps_write = psb->ps_samples; 3907147191Sjkoshy else 3908147191Sjkoshy psb->ps_write = ps; 3909145256Sjkoshy 3910147191Sjkoshy done: 3911147191Sjkoshy /* mark CPU as needing processing */ 3912147191Sjkoshy atomic_set_rel_int(&pmc_cpumask, (1 << cpu)); 3913147191Sjkoshy 3914174395Sjkoshy return (error); 3915145256Sjkoshy} 3916145256Sjkoshy 3917174395Sjkoshy/* 3918174395Sjkoshy * Capture a user call chain. This function will be called from ast() 3919174395Sjkoshy * before control returns to userland and before the process gets 3920174395Sjkoshy * rescheduled. 3921174395Sjkoshy */ 3922147191Sjkoshy 3923174395Sjkoshystatic void 3924174395Sjkoshypmc_capture_user_callchain(int cpu, struct trapframe *tf) 3925174395Sjkoshy{ 3926174395Sjkoshy int i; 3927174395Sjkoshy struct pmc *pm; 3928174395Sjkoshy struct pmc_sample *ps; 3929174395Sjkoshy struct pmc_samplebuffer *psb; 3930174395Sjkoshy 3931174395Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3932174395Sjkoshy 3933174395Sjkoshy /* 3934174395Sjkoshy * Iterate through all deferred callchain requests. 3935174395Sjkoshy */ 3936174395Sjkoshy 3937174395Sjkoshy for (i = 0; i < pmc_nsamples; i++) { 3938174395Sjkoshy 3939174395Sjkoshy ps = &psb->ps_samples[i]; 3940174395Sjkoshy if (ps->ps_nsamples != PMC_SAMPLE_INUSE) 3941174395Sjkoshy continue; 3942174395Sjkoshy 3943174395Sjkoshy pm = ps->ps_pmc; 3944174395Sjkoshy 3945174395Sjkoshy KASSERT(pm->pm_flags & PMC_F_CALLCHAIN, 3946174395Sjkoshy ("[pmc,%d] Retrieving callchain for PMC that doesn't " 3947174395Sjkoshy "want it", __LINE__)); 3948174395Sjkoshy 3949174395Sjkoshy /* 3950174395Sjkoshy * Retrieve the callchain and mark the sample buffer 3951174395Sjkoshy * as 'processable' by the timer tick sweep code. 3952174395Sjkoshy */ 3953174395Sjkoshy ps->ps_nsamples = pmc_save_user_callchain(ps->ps_pc, 3954174395Sjkoshy pmc_callchaindepth, tf); 3955174395Sjkoshy } 3956174395Sjkoshy 3957174395Sjkoshy return; 3958174395Sjkoshy} 3959174395Sjkoshy 3960174395Sjkoshy 3961145256Sjkoshy/* 3962147191Sjkoshy * Process saved PC samples. 3963145256Sjkoshy */ 3964145256Sjkoshy 3965145256Sjkoshystatic void 3966147191Sjkoshypmc_process_samples(int cpu) 3967145256Sjkoshy{ 3968147191Sjkoshy struct pmc *pm; 3969185363Sjkoshy int adjri, n; 3970147191Sjkoshy struct thread *td; 3971147191Sjkoshy struct pmc_owner *po; 3972147191Sjkoshy struct pmc_sample *ps; 3973184802Sjkoshy struct pmc_classdep *pcd; 3974147191Sjkoshy struct pmc_samplebuffer *psb; 3975145256Sjkoshy 3976147191Sjkoshy KASSERT(PCPU_GET(cpuid) == cpu, 3977147191Sjkoshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 3978147191Sjkoshy PCPU_GET(cpuid), cpu)); 3979145256Sjkoshy 3980147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3981147191Sjkoshy 3982147191Sjkoshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 3983147191Sjkoshy 3984147191Sjkoshy ps = psb->ps_read; 3985174395Sjkoshy if (ps->ps_nsamples == PMC_SAMPLE_FREE) 3986147191Sjkoshy break; 3987174395Sjkoshy if (ps->ps_nsamples == PMC_SAMPLE_INUSE) { 3988174395Sjkoshy /* Need a rescan at a later time. */ 3989174395Sjkoshy atomic_set_rel_int(&pmc_cpumask, (1 << cpu)); 3990174395Sjkoshy break; 3991174395Sjkoshy } 3992147191Sjkoshy 3993147191Sjkoshy pm = ps->ps_pmc; 3994147191Sjkoshy po = pm->pm_owner; 3995147191Sjkoshy 3996147191Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 3997147191Sjkoshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 3998147191Sjkoshy pm, PMC_TO_MODE(pm))); 3999147191Sjkoshy 4000147191Sjkoshy /* Ignore PMCs that have been switched off */ 4001147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 4002147191Sjkoshy goto entrydone; 4003147191Sjkoshy 4004174395Sjkoshy PMCDBG(SAM,OPS,1,"cpu=%d pm=%p n=%d fl=%x wr=%d rd=%d", cpu, 4005174395Sjkoshy pm, ps->ps_nsamples, ps->ps_flags, 4006147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4007147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4008147191Sjkoshy 4009147191Sjkoshy /* 4010147191Sjkoshy * If this is a process-mode PMC that is attached to 4011147191Sjkoshy * its owner, and if the PC is in user mode, update 4012147191Sjkoshy * profiling statistics like timer-based profiling 4013147191Sjkoshy * would have done. 4014147191Sjkoshy */ 4015147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 4016174395Sjkoshy if (ps->ps_flags & PMC_CC_F_USERSPACE) { 4017147191Sjkoshy td = FIRST_THREAD_IN_PROC(po->po_owner); 4018174395Sjkoshy addupc_intr(td, ps->ps_pc[0], 1); 4019147191Sjkoshy } 4020147191Sjkoshy goto entrydone; 4021147191Sjkoshy } 4022147191Sjkoshy 4023147191Sjkoshy /* 4024147191Sjkoshy * Otherwise, this is either a sampling mode PMC that 4025147191Sjkoshy * is attached to a different process than its owner, 4026147191Sjkoshy * or a system-wide sampling PMC. Dispatch a log 4027147191Sjkoshy * entry to the PMC's owner process. 4028147191Sjkoshy */ 4029147191Sjkoshy 4030174395Sjkoshy pmclog_process_callchain(pm, ps); 4031147191Sjkoshy 4032147191Sjkoshy entrydone: 4033174395Sjkoshy ps->ps_nsamples = 0; /* mark entry as free */ 4034147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 4035147191Sjkoshy 4036147191Sjkoshy /* increment read pointer, modulo sample size */ 4037147191Sjkoshy if (++ps == psb->ps_fence) 4038147191Sjkoshy psb->ps_read = psb->ps_samples; 4039147191Sjkoshy else 4040147191Sjkoshy psb->ps_read = ps; 4041147191Sjkoshy } 4042147191Sjkoshy 4043147191Sjkoshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 4044147191Sjkoshy 4045147191Sjkoshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 4046147191Sjkoshy if (n == 0) 4047147191Sjkoshy return; 4048147191Sjkoshy 4049147191Sjkoshy /* 4050147191Sjkoshy * Restart any stalled sampling PMCs on this CPU. 4051147191Sjkoshy * 4052147867Sjkoshy * If the NMI handler sets the pm_stalled field of a PMC after 4053147867Sjkoshy * the check below, we'll end up processing the stalled PMC at 4054147867Sjkoshy * the next hardclock tick. 4055147191Sjkoshy */ 4056147191Sjkoshy for (n = 0; n < md->pmd_npmc; n++) { 4057184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 4058184802Sjkoshy KASSERT(pcd != NULL, 4059184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 4060184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu,adjri,&pm); 4061184802Sjkoshy 4062147191Sjkoshy if (pm == NULL || /* !cfg'ed */ 4063147191Sjkoshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 4064147191Sjkoshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 4065147867Sjkoshy pm->pm_stalled == 0) /* !stalled */ 4066147191Sjkoshy continue; 4067147191Sjkoshy 4068147867Sjkoshy pm->pm_stalled = 0; 4069184802Sjkoshy (*pcd->pcd_start_pmc)(cpu, adjri); 4070147191Sjkoshy } 4071145256Sjkoshy} 4072145256Sjkoshy 4073145256Sjkoshy/* 4074145256Sjkoshy * Event handlers. 4075145256Sjkoshy */ 4076145256Sjkoshy 4077145256Sjkoshy/* 4078145256Sjkoshy * Handle a process exit. 4079145256Sjkoshy * 4080147191Sjkoshy * Remove this process from all hash tables. If this process 4081147191Sjkoshy * owned any PMCs, turn off those PMCs and deallocate them, 4082147191Sjkoshy * removing any associations with target processes. 4083147191Sjkoshy * 4084147191Sjkoshy * This function will be called by the last 'thread' of a 4085147191Sjkoshy * process. 4086147191Sjkoshy * 4087145256Sjkoshy * XXX This eventhandler gets called early in the exit process. 4088145256Sjkoshy * Consider using a 'hook' invocation from thread_exit() or equivalent 4089145256Sjkoshy * spot. Another negative is that kse_exit doesn't seem to call 4090145256Sjkoshy * exit1() [??]. 4091147191Sjkoshy * 4092145256Sjkoshy */ 4093145256Sjkoshy 4094145256Sjkoshystatic void 4095145256Sjkoshypmc_process_exit(void *arg __unused, struct proc *p) 4096145256Sjkoshy{ 4097184802Sjkoshy struct pmc *pm; 4098184802Sjkoshy int adjri, cpu; 4099184802Sjkoshy unsigned int ri; 4100145256Sjkoshy int is_using_hwpmcs; 4101184802Sjkoshy struct pmc_owner *po; 4102147191Sjkoshy struct pmc_process *pp; 4103184802Sjkoshy struct pmc_classdep *pcd; 4104147191Sjkoshy pmc_value_t newvalue, tmp; 4105145256Sjkoshy 4106145256Sjkoshy PROC_LOCK(p); 4107145256Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 4108145256Sjkoshy PROC_UNLOCK(p); 4109145256Sjkoshy 4110147191Sjkoshy /* 4111147191Sjkoshy * Log a sysexit event to all SS PMC owners. 4112147191Sjkoshy */ 4113147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4114147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4115147191Sjkoshy pmclog_process_sysexit(po, p->p_pid); 4116145256Sjkoshy 4117147191Sjkoshy if (!is_using_hwpmcs) 4118147191Sjkoshy return; 4119147191Sjkoshy 4120147191Sjkoshy PMC_GET_SX_XLOCK(); 4121147191Sjkoshy PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 4122147191Sjkoshy p->p_comm); 4123147191Sjkoshy 4124147191Sjkoshy /* 4125147191Sjkoshy * Since this code is invoked by the last thread in an exiting 4126147191Sjkoshy * process, we would have context switched IN at some prior 4127147191Sjkoshy * point. However, with PREEMPTION, kernel mode context 4128147191Sjkoshy * switches may happen any time, so we want to disable a 4129147191Sjkoshy * context switch OUT till we get any PMCs targetting this 4130147191Sjkoshy * process off the hardware. 4131147191Sjkoshy * 4132147191Sjkoshy * We also need to atomically remove this process' 4133147191Sjkoshy * entry from our target process hash table, using 4134147191Sjkoshy * PMC_FLAG_REMOVE. 4135147191Sjkoshy */ 4136147191Sjkoshy PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 4137147191Sjkoshy p->p_comm); 4138147191Sjkoshy 4139147191Sjkoshy critical_enter(); /* no preemption */ 4140147191Sjkoshy 4141147191Sjkoshy cpu = curthread->td_oncpu; 4142147191Sjkoshy 4143147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, 4144147191Sjkoshy PMC_FLAG_REMOVE)) != NULL) { 4145147191Sjkoshy 4146147191Sjkoshy PMCDBG(PRC,EXT,2, 4147147191Sjkoshy "process-exit proc=%p pmc-process=%p", p, pp); 4148147191Sjkoshy 4149147191Sjkoshy /* 4150147191Sjkoshy * The exiting process could the target of 4151147191Sjkoshy * some PMCs which will be running on 4152147191Sjkoshy * currently executing CPU. 4153147191Sjkoshy * 4154147191Sjkoshy * We need to turn these PMCs off like we 4155147191Sjkoshy * would do at context switch OUT time. 4156147191Sjkoshy */ 4157147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 4158147191Sjkoshy 4159147191Sjkoshy /* 4160147191Sjkoshy * Pick up the pmc pointer from hardware 4161147191Sjkoshy * state similar to the CSW_OUT code. 4162147191Sjkoshy */ 4163147191Sjkoshy pm = NULL; 4164147191Sjkoshy 4165184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 4166184802Sjkoshy 4167184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 4168184802Sjkoshy 4169147191Sjkoshy PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 4170147191Sjkoshy 4171147191Sjkoshy if (pm == NULL || 4172147191Sjkoshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 4173147191Sjkoshy continue; 4174147191Sjkoshy 4175147191Sjkoshy PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 4176147191Sjkoshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 4177147191Sjkoshy pm, pm->pm_state); 4178147191Sjkoshy 4179147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 4180147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 4181147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 4182147191Sjkoshy 4183147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 4184147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 4185147191Sjkoshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 4186147191Sjkoshy 4187184802Sjkoshy (void) pcd->pcd_stop_pmc(cpu, adjri); 4188147191Sjkoshy 4189147191Sjkoshy KASSERT(pm->pm_runcount > 0, 4190147191Sjkoshy ("[pmc,%d] bad runcount ri %d rc %d", 4191147191Sjkoshy __LINE__, ri, pm->pm_runcount)); 4192147191Sjkoshy 4193147867Sjkoshy /* Stop hardware only if it is actually running */ 4194147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 4195147867Sjkoshy pm->pm_stalled == 0) { 4196184802Sjkoshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 4197147191Sjkoshy tmp = newvalue - 4198147191Sjkoshy PMC_PCPU_SAVED(cpu,ri); 4199147191Sjkoshy 4200147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 4201147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 4202147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 4203147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 4204147191Sjkoshy } 4205147191Sjkoshy 4206147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount,1); 4207147191Sjkoshy 4208147191Sjkoshy KASSERT((int) pm->pm_runcount >= 0, 4209147191Sjkoshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 4210147191Sjkoshy 4211184802Sjkoshy (void) pcd->pcd_config_pmc(cpu, adjri, NULL); 4212147191Sjkoshy } 4213147191Sjkoshy 4214147191Sjkoshy /* 4215147191Sjkoshy * Inform the MD layer of this pseudo "context switch 4216147191Sjkoshy * out" 4217147191Sjkoshy */ 4218147191Sjkoshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 4219147191Sjkoshy 4220147191Sjkoshy critical_exit(); /* ok to be pre-empted now */ 4221147191Sjkoshy 4222147191Sjkoshy /* 4223147191Sjkoshy * Unlink this process from the PMCs that are 4224147191Sjkoshy * targetting it. This will send a signal to 4225147191Sjkoshy * all PMC owner's whose PMCs are orphaned. 4226147191Sjkoshy * 4227147191Sjkoshy * Log PMC value at exit time if requested. 4228147191Sjkoshy */ 4229147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4230147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 4231147867Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 4232147867Sjkoshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 4233147191Sjkoshy pmclog_process_procexit(pm, pp); 4234147191Sjkoshy pmc_unlink_target_process(pm, pp); 4235147191Sjkoshy } 4236184205Sdes free(pp, M_PMC); 4237147191Sjkoshy 4238147191Sjkoshy } else 4239147191Sjkoshy critical_exit(); /* pp == NULL */ 4240147191Sjkoshy 4241147191Sjkoshy 4242147191Sjkoshy /* 4243147191Sjkoshy * If the process owned PMCs, free them up and free up 4244147191Sjkoshy * memory. 4245147191Sjkoshy */ 4246147191Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 4247147191Sjkoshy pmc_remove_owner(po); 4248147191Sjkoshy pmc_destroy_owner_descriptor(po); 4249145256Sjkoshy } 4250147191Sjkoshy 4251147191Sjkoshy sx_xunlock(&pmc_sx); 4252145256Sjkoshy} 4253145256Sjkoshy 4254145256Sjkoshy/* 4255145256Sjkoshy * Handle a process fork. 4256145256Sjkoshy * 4257145256Sjkoshy * If the parent process 'p1' is under HWPMC monitoring, then copy 4258145256Sjkoshy * over any attached PMCs that have 'do_descendants' semantics. 4259145256Sjkoshy */ 4260145256Sjkoshy 4261145256Sjkoshystatic void 4262147191Sjkoshypmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 4263145256Sjkoshy int flags) 4264145256Sjkoshy{ 4265145256Sjkoshy int is_using_hwpmcs; 4266147191Sjkoshy unsigned int ri; 4267147191Sjkoshy uint32_t do_descendants; 4268147191Sjkoshy struct pmc *pm; 4269147191Sjkoshy struct pmc_owner *po; 4270147191Sjkoshy struct pmc_process *ppnew, *ppold; 4271145256Sjkoshy 4272145256Sjkoshy (void) flags; /* unused parameter */ 4273145256Sjkoshy 4274145256Sjkoshy PROC_LOCK(p1); 4275145256Sjkoshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 4276145256Sjkoshy PROC_UNLOCK(p1); 4277145256Sjkoshy 4278147191Sjkoshy /* 4279147191Sjkoshy * If there are system-wide sampling PMCs active, we need to 4280147191Sjkoshy * log all fork events to their owner's logs. 4281147191Sjkoshy */ 4282147191Sjkoshy 4283147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4284147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4285147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 4286147191Sjkoshy 4287147191Sjkoshy if (!is_using_hwpmcs) 4288147191Sjkoshy return; 4289147191Sjkoshy 4290147191Sjkoshy PMC_GET_SX_XLOCK(); 4291147191Sjkoshy PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 4292147191Sjkoshy p1->p_pid, p1->p_comm, newproc); 4293147191Sjkoshy 4294147191Sjkoshy /* 4295147191Sjkoshy * If the parent process (curthread->td_proc) is a 4296147191Sjkoshy * target of any PMCs, look for PMCs that are to be 4297147191Sjkoshy * inherited, and link these into the new process 4298147191Sjkoshy * descriptor. 4299147191Sjkoshy */ 4300147191Sjkoshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 4301147191Sjkoshy PMC_FLAG_NONE)) == NULL) 4302147191Sjkoshy goto done; /* nothing to do */ 4303147191Sjkoshy 4304147191Sjkoshy do_descendants = 0; 4305147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4306147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 4307147191Sjkoshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 4308147191Sjkoshy if (do_descendants == 0) /* nothing to do */ 4309147191Sjkoshy goto done; 4310147191Sjkoshy 4311147191Sjkoshy /* allocate a descriptor for the new process */ 4312147191Sjkoshy if ((ppnew = pmc_find_process_descriptor(newproc, 4313147191Sjkoshy PMC_FLAG_ALLOCATE)) == NULL) 4314147191Sjkoshy goto done; 4315147191Sjkoshy 4316147191Sjkoshy /* 4317147191Sjkoshy * Run through all PMCs that were targeting the old process 4318147191Sjkoshy * and which specified F_DESCENDANTS and attach them to the 4319147191Sjkoshy * new process. 4320147191Sjkoshy * 4321147191Sjkoshy * Log the fork event to all owners of PMCs attached to this 4322147191Sjkoshy * process, if not already logged. 4323147191Sjkoshy */ 4324147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4325147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 4326147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 4327147191Sjkoshy pmc_link_target_process(pm, ppnew); 4328147191Sjkoshy po = pm->pm_owner; 4329147191Sjkoshy if (po->po_sscount == 0 && 4330147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 4331147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, 4332147191Sjkoshy newproc->p_pid); 4333147191Sjkoshy } 4334147191Sjkoshy 4335147191Sjkoshy /* 4336147191Sjkoshy * Now mark the new process as being tracked by this driver. 4337147191Sjkoshy */ 4338147191Sjkoshy PROC_LOCK(newproc); 4339147191Sjkoshy newproc->p_flag |= P_HWPMC; 4340147191Sjkoshy PROC_UNLOCK(newproc); 4341147191Sjkoshy 4342147191Sjkoshy done: 4343147191Sjkoshy sx_xunlock(&pmc_sx); 4344145256Sjkoshy} 4345145256Sjkoshy 4346145256Sjkoshy 4347145256Sjkoshy/* 4348145256Sjkoshy * initialization 4349145256Sjkoshy */ 4350145256Sjkoshy 4351145256Sjkoshystatic const char *pmc_name_of_pmcclass[] = { 4352145256Sjkoshy#undef __PMC_CLASS 4353145256Sjkoshy#define __PMC_CLASS(N) #N , 4354145256Sjkoshy __PMC_CLASSES() 4355145256Sjkoshy}; 4356145256Sjkoshy 4357145256Sjkoshystatic int 4358145256Sjkoshypmc_initialize(void) 4359145256Sjkoshy{ 4360184802Sjkoshy int c, cpu, error, n, ri; 4361183266Sjkoshy unsigned int maxcpu; 4362145256Sjkoshy struct pmc_binding pb; 4363174395Sjkoshy struct pmc_sample *ps; 4364184802Sjkoshy struct pmc_classdep *pcd; 4365147191Sjkoshy struct pmc_samplebuffer *sb; 4366145256Sjkoshy 4367145256Sjkoshy md = NULL; 4368145256Sjkoshy error = 0; 4369145256Sjkoshy 4370153110Sru#ifdef DEBUG 4371145256Sjkoshy /* parse debug flags first */ 4372145256Sjkoshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 4373145256Sjkoshy pmc_debugstr, sizeof(pmc_debugstr))) 4374145256Sjkoshy pmc_debugflags_parse(pmc_debugstr, 4375145256Sjkoshy pmc_debugstr+strlen(pmc_debugstr)); 4376145256Sjkoshy#endif 4377145256Sjkoshy 4378145256Sjkoshy PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 4379145256Sjkoshy 4380148562Sjkoshy /* check kernel version */ 4381148562Sjkoshy if (pmc_kernel_version != PMC_VERSION) { 4382148562Sjkoshy if (pmc_kernel_version == 0) 4383148562Sjkoshy printf("hwpmc: this kernel has not been compiled with " 4384148562Sjkoshy "'options HWPMC_HOOKS'.\n"); 4385148562Sjkoshy else 4386148562Sjkoshy printf("hwpmc: kernel version (0x%x) does not match " 4387148562Sjkoshy "module version (0x%x).\n", pmc_kernel_version, 4388148562Sjkoshy PMC_VERSION); 4389148562Sjkoshy return EPROGMISMATCH; 4390148562Sjkoshy } 4391148562Sjkoshy 4392145256Sjkoshy /* 4393145256Sjkoshy * check sysctl parameters 4394145256Sjkoshy */ 4395145256Sjkoshy 4396145256Sjkoshy if (pmc_hashsize <= 0) { 4397174395Sjkoshy (void) printf("hwpmc: tunable \"hashsize\"=%d must be " 4398174395Sjkoshy "greater than zero.\n", pmc_hashsize); 4399145256Sjkoshy pmc_hashsize = PMC_HASH_SIZE; 4400145256Sjkoshy } 4401145256Sjkoshy 4402147191Sjkoshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 4403174395Sjkoshy (void) printf("hwpmc: tunable \"nsamples\"=%d out of " 4404174395Sjkoshy "range.\n", pmc_nsamples); 4405147191Sjkoshy pmc_nsamples = PMC_NSAMPLES; 4406147191Sjkoshy } 4407145256Sjkoshy 4408174395Sjkoshy if (pmc_callchaindepth <= 0 || 4409174395Sjkoshy pmc_callchaindepth > PMC_CALLCHAIN_DEPTH_MAX) { 4410174395Sjkoshy (void) printf("hwpmc: tunable \"callchaindepth\"=%d out of " 4411174395Sjkoshy "range.\n", pmc_callchaindepth); 4412174395Sjkoshy pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 4413174395Sjkoshy } 4414174395Sjkoshy 4415147191Sjkoshy md = pmc_md_initialize(); 4416147191Sjkoshy 4417184802Sjkoshy if (md == NULL) 4418184802Sjkoshy return (ENOSYS); 4419145256Sjkoshy 4420184802Sjkoshy KASSERT(md->pmd_nclass >= 1 && md->pmd_npmc >= 1, 4421184802Sjkoshy ("[pmc,%d] no classes or pmcs", __LINE__)); 4422184802Sjkoshy 4423184802Sjkoshy /* Compute the map from row-indices to classdep pointers. */ 4424184802Sjkoshy pmc_rowindex_to_classdep = malloc(sizeof(struct pmc_classdep *) * 4425184802Sjkoshy md->pmd_npmc, M_PMC, M_WAITOK|M_ZERO); 4426184802Sjkoshy 4427184802Sjkoshy for (n = 0; n < md->pmd_npmc; n++) 4428184802Sjkoshy pmc_rowindex_to_classdep[n] = NULL; 4429184802Sjkoshy for (ri = c = 0; c < md->pmd_nclass; c++) { 4430184802Sjkoshy pcd = &md->pmd_classdep[c]; 4431184802Sjkoshy for (n = 0; n < pcd->pcd_num; n++, ri++) 4432184802Sjkoshy pmc_rowindex_to_classdep[ri] = pcd; 4433184802Sjkoshy } 4434184802Sjkoshy 4435184802Sjkoshy KASSERT(ri == md->pmd_npmc, 4436184802Sjkoshy ("[pmc,%d] npmc miscomputed: ri=%d, md->npmc=%d", __LINE__, 4437184802Sjkoshy ri, md->pmd_npmc)); 4438184802Sjkoshy 4439183266Sjkoshy maxcpu = pmc_cpu_max(); 4440183266Sjkoshy 4441145256Sjkoshy /* allocate space for the per-cpu array */ 4442184802Sjkoshy pmc_pcpu = malloc(maxcpu * sizeof(struct pmc_cpu *), M_PMC, 4443184802Sjkoshy M_WAITOK|M_ZERO); 4444145256Sjkoshy 4445145256Sjkoshy /* per-cpu 'saved values' for managing process-mode PMCs */ 4446184214Sdes pmc_pcpu_saved = malloc(sizeof(pmc_value_t) * maxcpu * md->pmd_npmc, 4447184214Sdes M_PMC, M_WAITOK); 4448145256Sjkoshy 4449183266Sjkoshy /* Perform CPU-dependent initialization. */ 4450145256Sjkoshy pmc_save_cpu_binding(&pb); 4451184802Sjkoshy error = 0; 4452184802Sjkoshy for (cpu = 0; error == 0 && cpu < maxcpu; cpu++) { 4453183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4454145256Sjkoshy continue; 4455145256Sjkoshy pmc_select_cpu(cpu); 4456184802Sjkoshy pmc_pcpu[cpu] = malloc(sizeof(struct pmc_cpu) + 4457184802Sjkoshy md->pmd_npmc * sizeof(struct pmc_hw *), M_PMC, 4458184802Sjkoshy M_WAITOK|M_ZERO); 4459184802Sjkoshy if (md->pmd_pcpu_init) 4460185363Sjkoshy error = md->pmd_pcpu_init(md, cpu); 4461184802Sjkoshy for (n = 0; error == 0 && n < md->pmd_nclass; n++) 4462184802Sjkoshy error = md->pmd_classdep[n].pcd_pcpu_init(md, cpu); 4463145256Sjkoshy } 4464145256Sjkoshy pmc_restore_cpu_binding(&pb); 4465145256Sjkoshy 4466184802Sjkoshy if (error) 4467184802Sjkoshy return (error); 4468145256Sjkoshy 4469147191Sjkoshy /* allocate space for the sample array */ 4470183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 4471183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4472147191Sjkoshy continue; 4473184802Sjkoshy 4474184214Sdes sb = malloc(sizeof(struct pmc_samplebuffer) + 4475147191Sjkoshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4476147191Sjkoshy M_WAITOK|M_ZERO); 4477147191Sjkoshy sb->ps_read = sb->ps_write = sb->ps_samples; 4478153735Sjkoshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4479184802Sjkoshy 4480147191Sjkoshy KASSERT(pmc_pcpu[cpu] != NULL, 4481147191Sjkoshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4482147191Sjkoshy 4483184802Sjkoshy sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples * 4484184802Sjkoshy sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO); 4485174395Sjkoshy 4486174395Sjkoshy for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4487174395Sjkoshy ps->ps_pc = sb->ps_callchains + 4488174395Sjkoshy (n * pmc_callchaindepth); 4489174395Sjkoshy 4490147191Sjkoshy pmc_pcpu[cpu]->pc_sb = sb; 4491147191Sjkoshy } 4492147191Sjkoshy 4493145256Sjkoshy /* allocate space for the row disposition array */ 4494145256Sjkoshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 4495145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4496145256Sjkoshy 4497145256Sjkoshy KASSERT(pmc_pmcdisp != NULL, 4498145256Sjkoshy ("[pmc,%d] pmcdisp allocation returned NULL", __LINE__)); 4499145256Sjkoshy 4500145256Sjkoshy /* mark all PMCs as available */ 4501145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 4502145256Sjkoshy PMC_MARK_ROW_FREE(n); 4503145256Sjkoshy 4504145256Sjkoshy /* allocate thread hash tables */ 4505145256Sjkoshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 4506145256Sjkoshy &pmc_ownerhashmask); 4507145256Sjkoshy 4508145256Sjkoshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 4509145256Sjkoshy &pmc_processhashmask); 4510168856Sjkoshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc-leaf", 4511168856Sjkoshy MTX_SPIN); 4512145256Sjkoshy 4513147191Sjkoshy LIST_INIT(&pmc_ss_owners); 4514147191Sjkoshy pmc_ss_count = 0; 4515147191Sjkoshy 4516145256Sjkoshy /* allocate a pool of spin mutexes */ 4517168856Sjkoshy pmc_mtxpool = mtx_pool_create("pmc-leaf", pmc_mtxpool_size, 4518168856Sjkoshy MTX_SPIN); 4519145256Sjkoshy 4520145256Sjkoshy PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4521145256Sjkoshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4522145256Sjkoshy pmc_processhash, pmc_processhashmask); 4523145256Sjkoshy 4524145256Sjkoshy /* register process {exit,fork,exec} handlers */ 4525145256Sjkoshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4526145256Sjkoshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4527145256Sjkoshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4528145256Sjkoshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4529145256Sjkoshy 4530147191Sjkoshy /* initialize logging */ 4531147191Sjkoshy pmclog_initialize(); 4532147191Sjkoshy 4533145256Sjkoshy /* set hook functions */ 4534145256Sjkoshy pmc_intr = md->pmd_intr; 4535145256Sjkoshy pmc_hook = pmc_hook_handler; 4536145256Sjkoshy 4537145256Sjkoshy if (error == 0) { 4538145256Sjkoshy printf(PMC_MODULE_NAME ":"); 4539149373Sjkoshy for (n = 0; n < (int) md->pmd_nclass; n++) { 4540184802Sjkoshy pcd = &md->pmd_classdep[n]; 4541184997Sjkoshy printf(" %s/%d/%d/0x%b", 4542184802Sjkoshy pmc_name_of_pmcclass[pcd->pcd_class], 4543184802Sjkoshy pcd->pcd_num, 4544184997Sjkoshy pcd->pcd_width, 4545184802Sjkoshy pcd->pcd_caps, 4546149373Sjkoshy "\20" 4547149373Sjkoshy "\1INT\2USR\3SYS\4EDG\5THR" 4548149373Sjkoshy "\6REA\7WRI\10INV\11QUA\12PRC" 4549149373Sjkoshy "\13TAG\14CSC"); 4550149373Sjkoshy } 4551145256Sjkoshy printf("\n"); 4552145256Sjkoshy } 4553145256Sjkoshy 4554184802Sjkoshy return (error); 4555145256Sjkoshy} 4556145256Sjkoshy 4557145256Sjkoshy/* prepare to be unloaded */ 4558145256Sjkoshystatic void 4559145256Sjkoshypmc_cleanup(void) 4560145256Sjkoshy{ 4561184802Sjkoshy int c, cpu; 4562183266Sjkoshy unsigned int maxcpu; 4563145256Sjkoshy struct pmc_ownerhash *ph; 4564145256Sjkoshy struct pmc_owner *po, *tmp; 4565145256Sjkoshy struct pmc_binding pb; 4566153110Sru#ifdef DEBUG 4567145256Sjkoshy struct pmc_processhash *prh; 4568145256Sjkoshy#endif 4569145256Sjkoshy 4570145256Sjkoshy PMCDBG(MOD,INI,0, "%s", "cleanup"); 4571145256Sjkoshy 4572147191Sjkoshy /* switch off sampling */ 4573147191Sjkoshy atomic_store_rel_int(&pmc_cpumask, 0); 4574147191Sjkoshy pmc_intr = NULL; 4575145256Sjkoshy 4576145256Sjkoshy sx_xlock(&pmc_sx); 4577145256Sjkoshy if (pmc_hook == NULL) { /* being unloaded already */ 4578145256Sjkoshy sx_xunlock(&pmc_sx); 4579145256Sjkoshy return; 4580145256Sjkoshy } 4581145256Sjkoshy 4582145256Sjkoshy pmc_hook = NULL; /* prevent new threads from entering module */ 4583145256Sjkoshy 4584145256Sjkoshy /* deregister event handlers */ 4585145256Sjkoshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 4586145256Sjkoshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 4587145256Sjkoshy 4588145256Sjkoshy /* send SIGBUS to all owner threads, free up allocations */ 4589145256Sjkoshy if (pmc_ownerhash) 4590145256Sjkoshy for (ph = pmc_ownerhash; 4591145256Sjkoshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 4592145256Sjkoshy ph++) { 4593145256Sjkoshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 4594145256Sjkoshy pmc_remove_owner(po); 4595145256Sjkoshy 4596145256Sjkoshy /* send SIGBUS to owner processes */ 4597145256Sjkoshy PMCDBG(MOD,INI,2, "cleanup signal proc=%p " 4598145256Sjkoshy "(%d, %s)", po->po_owner, 4599145256Sjkoshy po->po_owner->p_pid, 4600145256Sjkoshy po->po_owner->p_comm); 4601145256Sjkoshy 4602145256Sjkoshy PROC_LOCK(po->po_owner); 4603145256Sjkoshy psignal(po->po_owner, SIGBUS); 4604145256Sjkoshy PROC_UNLOCK(po->po_owner); 4605147191Sjkoshy 4606147191Sjkoshy pmc_destroy_owner_descriptor(po); 4607145256Sjkoshy } 4608145256Sjkoshy } 4609145256Sjkoshy 4610145256Sjkoshy /* reclaim allocated data structures */ 4611145256Sjkoshy if (pmc_mtxpool) 4612145256Sjkoshy mtx_pool_destroy(&pmc_mtxpool); 4613145256Sjkoshy 4614145256Sjkoshy mtx_destroy(&pmc_processhash_mtx); 4615145256Sjkoshy if (pmc_processhash) { 4616153110Sru#ifdef DEBUG 4617145256Sjkoshy struct pmc_process *pp; 4618145256Sjkoshy 4619145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy process hash"); 4620145256Sjkoshy for (prh = pmc_processhash; 4621145256Sjkoshy prh <= &pmc_processhash[pmc_processhashmask]; 4622145256Sjkoshy prh++) 4623145256Sjkoshy LIST_FOREACH(pp, prh, pp_next) 4624145256Sjkoshy PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 4625145256Sjkoshy#endif 4626145256Sjkoshy 4627145256Sjkoshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 4628145256Sjkoshy pmc_processhash = NULL; 4629145256Sjkoshy } 4630145256Sjkoshy 4631145256Sjkoshy if (pmc_ownerhash) { 4632145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy owner hash"); 4633145256Sjkoshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 4634145256Sjkoshy pmc_ownerhash = NULL; 4635145256Sjkoshy } 4636145256Sjkoshy 4637147191Sjkoshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 4638147191Sjkoshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 4639147191Sjkoshy KASSERT(pmc_ss_count == 0, 4640147191Sjkoshy ("[pmc,%d] Global SS count not empty", __LINE__)); 4641147191Sjkoshy 4642184802Sjkoshy /* do processor and pmc-class dependent cleanup */ 4643183266Sjkoshy maxcpu = pmc_cpu_max(); 4644153735Sjkoshy 4645145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "md cleanup"); 4646145256Sjkoshy if (md) { 4647145256Sjkoshy pmc_save_cpu_binding(&pb); 4648183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 4649145256Sjkoshy PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 4650145256Sjkoshy cpu, pmc_pcpu[cpu]); 4651183266Sjkoshy if (!pmc_cpu_is_active(cpu) || pmc_pcpu[cpu] == NULL) 4652145256Sjkoshy continue; 4653145256Sjkoshy pmc_select_cpu(cpu); 4654184802Sjkoshy for (c = 0; c < md->pmd_nclass; c++) 4655184802Sjkoshy md->pmd_classdep[c].pcd_pcpu_fini(md, cpu); 4656184802Sjkoshy if (md->pmd_pcpu_fini) 4657185363Sjkoshy md->pmd_pcpu_fini(md, cpu); 4658145256Sjkoshy } 4659184994Sjkoshy 4660184994Sjkoshy pmc_md_finalize(md); 4661184994Sjkoshy 4662184205Sdes free(md, M_PMC); 4663145256Sjkoshy md = NULL; 4664145256Sjkoshy pmc_restore_cpu_binding(&pb); 4665145256Sjkoshy } 4666145256Sjkoshy 4667184802Sjkoshy /* Free per-cpu descriptors. */ 4668184802Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 4669184802Sjkoshy if (!pmc_cpu_is_active(cpu)) 4670184802Sjkoshy continue; 4671184802Sjkoshy KASSERT(pmc_pcpu[cpu]->pc_sb != NULL, 4672184802Sjkoshy ("[pmc,%d] Null cpu sample buffer cpu=%d", __LINE__, 4673184802Sjkoshy cpu)); 4674184802Sjkoshy free(pmc_pcpu[cpu]->pc_sb->ps_callchains, M_PMC); 4675184802Sjkoshy free(pmc_pcpu[cpu]->pc_sb, M_PMC); 4676184802Sjkoshy free(pmc_pcpu[cpu], M_PMC); 4677184802Sjkoshy } 4678184802Sjkoshy 4679184205Sdes free(pmc_pcpu, M_PMC); 4680145256Sjkoshy pmc_pcpu = NULL; 4681145256Sjkoshy 4682184205Sdes free(pmc_pcpu_saved, M_PMC); 4683145256Sjkoshy pmc_pcpu_saved = NULL; 4684145256Sjkoshy 4685145256Sjkoshy if (pmc_pmcdisp) { 4686184205Sdes free(pmc_pmcdisp, M_PMC); 4687145256Sjkoshy pmc_pmcdisp = NULL; 4688145256Sjkoshy } 4689145256Sjkoshy 4690184802Sjkoshy if (pmc_rowindex_to_classdep) { 4691184802Sjkoshy free(pmc_rowindex_to_classdep, M_PMC); 4692184802Sjkoshy pmc_rowindex_to_classdep = NULL; 4693184802Sjkoshy } 4694184802Sjkoshy 4695147191Sjkoshy pmclog_shutdown(); 4696147191Sjkoshy 4697145256Sjkoshy sx_xunlock(&pmc_sx); /* we are done */ 4698145256Sjkoshy} 4699145256Sjkoshy 4700145256Sjkoshy/* 4701145256Sjkoshy * The function called at load/unload. 4702145256Sjkoshy */ 4703145256Sjkoshy 4704145256Sjkoshystatic int 4705145256Sjkoshyload (struct module *module __unused, int cmd, void *arg __unused) 4706145256Sjkoshy{ 4707145256Sjkoshy int error; 4708145256Sjkoshy 4709145256Sjkoshy error = 0; 4710145256Sjkoshy 4711145256Sjkoshy switch (cmd) { 4712145256Sjkoshy case MOD_LOAD : 4713145256Sjkoshy /* initialize the subsystem */ 4714145256Sjkoshy error = pmc_initialize(); 4715145256Sjkoshy if (error != 0) 4716145256Sjkoshy break; 4717183266Sjkoshy PMCDBG(MOD,INI,1, "syscall=%d maxcpu=%d", 4718183266Sjkoshy pmc_syscall_num, pmc_cpu_max()); 4719145256Sjkoshy break; 4720145256Sjkoshy 4721145256Sjkoshy 4722145256Sjkoshy case MOD_UNLOAD : 4723145256Sjkoshy case MOD_SHUTDOWN: 4724145256Sjkoshy pmc_cleanup(); 4725145256Sjkoshy PMCDBG(MOD,INI,1, "%s", "unloaded"); 4726145256Sjkoshy break; 4727145256Sjkoshy 4728145256Sjkoshy default : 4729145256Sjkoshy error = EINVAL; /* XXX should panic(9) */ 4730145256Sjkoshy break; 4731145256Sjkoshy } 4732145256Sjkoshy 4733145256Sjkoshy return error; 4734145256Sjkoshy} 4735145256Sjkoshy 4736145256Sjkoshy/* memory pool */ 4737145256SjkoshyMALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 4738