hwpmc_mod.c revision 174395
1145256Sjkoshy/*- 2174395Sjkoshy * Copyright (c) 2003-2007 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 174395 2007-12-07 08:20:17Z 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); \ 101145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= (-mp_ncpus), ("[pmc,%d] row " \ 102145256Sjkoshy "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 */ 131145256Sjkoshystruct 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/* 157145256Sjkoshy * Prototypes 158145256Sjkoshy */ 159145256Sjkoshy 160153110Sru#ifdef DEBUG 161145256Sjkoshystatic int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 162145256Sjkoshystatic int pmc_debugflags_parse(char *newstr, char *fence); 163145256Sjkoshy#endif 164145256Sjkoshy 165145256Sjkoshystatic int load(struct module *module, int cmd, void *arg); 166147191Sjkoshystatic int pmc_attach_process(struct proc *p, struct pmc *pm); 167145256Sjkoshystatic struct pmc *pmc_allocate_pmc_descriptor(void); 168147191Sjkoshystatic struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 169147191Sjkoshystatic int pmc_attach_one_process(struct proc *p, struct pmc *pm); 170147191Sjkoshystatic int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 171147191Sjkoshy int cpu); 172147191Sjkoshystatic int pmc_can_attach(struct pmc *pm, struct proc *p); 173174395Sjkoshystatic void pmc_capture_user_callchain(int cpu, struct trapframe *tf); 174147191Sjkoshystatic void pmc_cleanup(void); 175147191Sjkoshystatic int pmc_detach_process(struct proc *p, struct pmc *pm); 176147191Sjkoshystatic int pmc_detach_one_process(struct proc *p, struct pmc *pm, 177147191Sjkoshy int flags); 178147191Sjkoshystatic void pmc_destroy_owner_descriptor(struct pmc_owner *po); 179147191Sjkoshystatic struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 180147191Sjkoshystatic int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 181145256Sjkoshystatic struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 182145256Sjkoshy pmc_id_t pmc); 183145256Sjkoshystatic struct pmc_process *pmc_find_process_descriptor(struct proc *p, 184145256Sjkoshy uint32_t mode); 185145774Sjkoshystatic void pmc_force_context_switch(void); 186145256Sjkoshystatic void pmc_link_target_process(struct pmc *pm, 187145256Sjkoshy struct pmc_process *pp); 188174395Sjkoshystatic void pmc_log_all_process_mappings(struct pmc_owner *po); 189174395Sjkoshystatic void pmc_log_kernel_mappings(struct pmc *pm); 190174395Sjkoshystatic void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p); 191147191Sjkoshystatic void pmc_maybe_remove_owner(struct pmc_owner *po); 192147191Sjkoshystatic void pmc_process_csw_in(struct thread *td); 193147191Sjkoshystatic void pmc_process_csw_out(struct thread *td); 194145256Sjkoshystatic void pmc_process_exit(void *arg, struct proc *p); 195145256Sjkoshystatic void pmc_process_fork(void *arg, struct proc *p1, 196145256Sjkoshy struct proc *p2, int n); 197147191Sjkoshystatic void pmc_process_samples(int cpu); 198147191Sjkoshystatic void pmc_release_pmc_descriptor(struct pmc *pmc); 199147191Sjkoshystatic void pmc_remove_owner(struct pmc_owner *po); 200147191Sjkoshystatic void pmc_remove_process_descriptor(struct pmc_process *pp); 201147191Sjkoshystatic void pmc_restore_cpu_binding(struct pmc_binding *pb); 202147191Sjkoshystatic void pmc_save_cpu_binding(struct pmc_binding *pb); 203147191Sjkoshystatic void pmc_select_cpu(int cpu); 204145256Sjkoshystatic int pmc_start(struct pmc *pm); 205145256Sjkoshystatic int pmc_stop(struct pmc *pm); 206147191Sjkoshystatic int pmc_syscall_handler(struct thread *td, void *syscall_args); 207147191Sjkoshystatic void pmc_unlink_target_process(struct pmc *pmc, 208147191Sjkoshy struct pmc_process *pp); 209145256Sjkoshy 210145256Sjkoshy/* 211145256Sjkoshy * Kernel tunables and sysctl(8) interface. 212145256Sjkoshy */ 213145256Sjkoshy 214145256SjkoshySYSCTL_NODE(_kern, OID_AUTO, hwpmc, CTLFLAG_RW, 0, "HWPMC parameters"); 215145256Sjkoshy 216174395Sjkoshystatic int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 217174395SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "callchaindepth", &pmc_callchaindepth); 218174395SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_TUN|CTLFLAG_RD, 219174395Sjkoshy &pmc_callchaindepth, 0, "depth of call chain records"); 220174395Sjkoshy 221153110Sru#ifdef DEBUG 222147191Sjkoshystruct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 223145256Sjkoshychar pmc_debugstr[PMC_DEBUG_STRSIZE]; 224145256SjkoshyTUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 225145256Sjkoshy sizeof(pmc_debugstr)); 226145256SjkoshySYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 227145256Sjkoshy CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN, 228145256Sjkoshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 229145256Sjkoshy#endif 230145256Sjkoshy 231145256Sjkoshy/* 232147191Sjkoshy * kern.hwpmc.hashrows -- determines the number of rows in the 233145256Sjkoshy * of the hash table used to look up threads 234145256Sjkoshy */ 235145256Sjkoshy 236145256Sjkoshystatic int pmc_hashsize = PMC_HASH_SIZE; 237145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize); 238145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD, 239145256Sjkoshy &pmc_hashsize, 0, "rows in hash tables"); 240145256Sjkoshy 241145256Sjkoshy/* 242174395Sjkoshy * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU 243145256Sjkoshy */ 244145256Sjkoshy 245147191Sjkoshystatic int pmc_nsamples = PMC_NSAMPLES; 246147191SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nsamples", &pmc_nsamples); 247147191SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_TUN|CTLFLAG_RD, 248147191Sjkoshy &pmc_nsamples, 0, "number of PC samples per CPU"); 249145256Sjkoshy 250174395Sjkoshy 251145256Sjkoshy/* 252147191Sjkoshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 253145256Sjkoshy */ 254145256Sjkoshy 255145256Sjkoshystatic int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 256145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size); 257145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD, 258145256Sjkoshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 259145256Sjkoshy 260145256Sjkoshy 261145256Sjkoshy/* 262145256Sjkoshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 263145256Sjkoshy * allocate system-wide PMCs. 264145256Sjkoshy * 265145256Sjkoshy * Allowing unprivileged processes to allocate system PMCs is convenient 266145256Sjkoshy * if system-wide measurements need to be taken concurrently with other 267145256Sjkoshy * per-process measurements. This feature is turned off by default. 268145256Sjkoshy */ 269145256Sjkoshy 270145256Sjkoshystatic int pmc_unprivileged_syspmcs = 0; 271145256SjkoshyTUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs); 272145256SjkoshySYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW, 273145256Sjkoshy &pmc_unprivileged_syspmcs, 0, 274145256Sjkoshy "allow unprivileged process to allocate system PMCs"); 275145256Sjkoshy 276147191Sjkoshy/* 277147191Sjkoshy * Hash function. Discard the lower 2 bits of the pointer since 278147191Sjkoshy * these are always zero for our uses. The hash multiplier is 279147191Sjkoshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 280147191Sjkoshy */ 281145256Sjkoshy 282145256Sjkoshy#if LONG_BIT == 64 283145256Sjkoshy#define _PMC_HM 11400714819323198486u 284145256Sjkoshy#elif LONG_BIT == 32 285145256Sjkoshy#define _PMC_HM 2654435769u 286145256Sjkoshy#else 287145256Sjkoshy#error Must know the size of 'long' to compile 288145256Sjkoshy#endif 289145256Sjkoshy 290145256Sjkoshy#define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 291145256Sjkoshy 292145256Sjkoshy/* 293145256Sjkoshy * Syscall structures 294145256Sjkoshy */ 295145256Sjkoshy 296145256Sjkoshy/* The `sysent' for the new syscall */ 297145256Sjkoshystatic struct sysent pmc_sysent = { 298145256Sjkoshy 2, /* sy_narg */ 299145256Sjkoshy pmc_syscall_handler /* sy_call */ 300145256Sjkoshy}; 301145256Sjkoshy 302145256Sjkoshystatic struct syscall_module_data pmc_syscall_mod = { 303145256Sjkoshy load, 304145256Sjkoshy NULL, 305145256Sjkoshy &pmc_syscall_num, 306145256Sjkoshy &pmc_sysent, 307145256Sjkoshy { 0, NULL } 308145256Sjkoshy}; 309145256Sjkoshy 310145256Sjkoshystatic moduledata_t pmc_mod = { 311145256Sjkoshy PMC_MODULE_NAME, 312145256Sjkoshy syscall_module_handler, 313145256Sjkoshy &pmc_syscall_mod 314145256Sjkoshy}; 315145256Sjkoshy 316145256SjkoshyDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 317145256SjkoshyMODULE_VERSION(pmc, PMC_VERSION); 318145256Sjkoshy 319153110Sru#ifdef DEBUG 320147191Sjkoshyenum pmc_dbgparse_state { 321147191Sjkoshy PMCDS_WS, /* in whitespace */ 322147191Sjkoshy PMCDS_MAJOR, /* seen a major keyword */ 323147191Sjkoshy PMCDS_MINOR 324147191Sjkoshy}; 325147191Sjkoshy 326145256Sjkoshystatic int 327145256Sjkoshypmc_debugflags_parse(char *newstr, char *fence) 328145256Sjkoshy{ 329145313Sjkoshy char c, *p, *q; 330147191Sjkoshy struct pmc_debugflags *tmpflags; 331147191Sjkoshy int error, found, *newbits, tmp; 332147191Sjkoshy size_t kwlen; 333145256Sjkoshy 334147191Sjkoshy MALLOC(tmpflags, struct pmc_debugflags *, sizeof(*tmpflags), 335147191Sjkoshy M_PMC, M_WAITOK|M_ZERO); 336145256Sjkoshy 337145256Sjkoshy p = newstr; 338147191Sjkoshy error = 0; 339145256Sjkoshy 340147191Sjkoshy for (; p < fence && (c = *p); p++) { 341145256Sjkoshy 342147191Sjkoshy /* skip white space */ 343147191Sjkoshy if (c == ' ' || c == '\t') 344147191Sjkoshy continue; 345147191Sjkoshy 346147191Sjkoshy /* look for a keyword followed by "=" */ 347147191Sjkoshy for (q = p; p < fence && (c = *p) && c != '='; p++) 348147191Sjkoshy ; 349147191Sjkoshy if (c != '=') { 350147191Sjkoshy error = EINVAL; 351147191Sjkoshy goto done; 352145256Sjkoshy } 353145256Sjkoshy 354147191Sjkoshy kwlen = p - q; 355147191Sjkoshy newbits = NULL; 356145256Sjkoshy 357147191Sjkoshy /* lookup flag group name */ 358147191Sjkoshy#define DBG_SET_FLAG_MAJ(S,F) \ 359147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 360147191Sjkoshy newbits = &tmpflags->pdb_ ## F; 361145256Sjkoshy 362147191Sjkoshy DBG_SET_FLAG_MAJ("cpu", CPU); 363147191Sjkoshy DBG_SET_FLAG_MAJ("csw", CSW); 364147191Sjkoshy DBG_SET_FLAG_MAJ("logging", LOG); 365147191Sjkoshy DBG_SET_FLAG_MAJ("module", MOD); 366147191Sjkoshy DBG_SET_FLAG_MAJ("md", MDP); 367147191Sjkoshy DBG_SET_FLAG_MAJ("owner", OWN); 368147191Sjkoshy DBG_SET_FLAG_MAJ("pmc", PMC); 369147191Sjkoshy DBG_SET_FLAG_MAJ("process", PRC); 370147191Sjkoshy DBG_SET_FLAG_MAJ("sampling", SAM); 371145256Sjkoshy 372147191Sjkoshy if (newbits == NULL) { 373147191Sjkoshy error = EINVAL; 374147191Sjkoshy goto done; 375145256Sjkoshy } 376145256Sjkoshy 377147191Sjkoshy p++; /* skip the '=' */ 378145256Sjkoshy 379147191Sjkoshy /* Now parse the individual flags */ 380147191Sjkoshy tmp = 0; 381147191Sjkoshy newflag: 382147191Sjkoshy for (q = p; p < fence && (c = *p); p++) 383147191Sjkoshy if (c == ' ' || c == '\t' || c == ',') 384147191Sjkoshy break; 385147191Sjkoshy 386147191Sjkoshy /* p == fence or c == ws or c == "," or c == 0 */ 387147191Sjkoshy 388147191Sjkoshy if ((kwlen = p - q) == 0) { 389147191Sjkoshy *newbits = tmp; 390147191Sjkoshy continue; 391147191Sjkoshy } 392147191Sjkoshy 393147191Sjkoshy found = 0; 394147191Sjkoshy#define DBG_SET_FLAG_MIN(S,F) \ 395147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 396147191Sjkoshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 397147191Sjkoshy 398147191Sjkoshy /* a '*' denotes all possible flags in the group */ 399147191Sjkoshy if (kwlen == 1 && *q == '*') 400147191Sjkoshy tmp = found = ~0; 401147191Sjkoshy /* look for individual flag names */ 402147191Sjkoshy DBG_SET_FLAG_MIN("allocaterow", ALR); 403147191Sjkoshy DBG_SET_FLAG_MIN("allocate", ALL); 404147191Sjkoshy DBG_SET_FLAG_MIN("attach", ATT); 405147191Sjkoshy DBG_SET_FLAG_MIN("bind", BND); 406147191Sjkoshy DBG_SET_FLAG_MIN("config", CFG); 407147191Sjkoshy DBG_SET_FLAG_MIN("exec", EXC); 408147191Sjkoshy DBG_SET_FLAG_MIN("exit", EXT); 409147191Sjkoshy DBG_SET_FLAG_MIN("find", FND); 410147191Sjkoshy DBG_SET_FLAG_MIN("flush", FLS); 411147191Sjkoshy DBG_SET_FLAG_MIN("fork", FRK); 412147191Sjkoshy DBG_SET_FLAG_MIN("getbuf", GTB); 413147191Sjkoshy DBG_SET_FLAG_MIN("hook", PMH); 414147191Sjkoshy DBG_SET_FLAG_MIN("init", INI); 415147191Sjkoshy DBG_SET_FLAG_MIN("intr", INT); 416147191Sjkoshy DBG_SET_FLAG_MIN("linktarget", TLK); 417147191Sjkoshy DBG_SET_FLAG_MIN("mayberemove", OMR); 418147191Sjkoshy DBG_SET_FLAG_MIN("ops", OPS); 419147191Sjkoshy DBG_SET_FLAG_MIN("read", REA); 420147191Sjkoshy DBG_SET_FLAG_MIN("register", REG); 421147191Sjkoshy DBG_SET_FLAG_MIN("release", REL); 422147191Sjkoshy DBG_SET_FLAG_MIN("remove", ORM); 423147191Sjkoshy DBG_SET_FLAG_MIN("sample", SAM); 424147191Sjkoshy DBG_SET_FLAG_MIN("scheduleio", SIO); 425147191Sjkoshy DBG_SET_FLAG_MIN("select", SEL); 426147191Sjkoshy DBG_SET_FLAG_MIN("signal", SIG); 427147191Sjkoshy DBG_SET_FLAG_MIN("swi", SWI); 428147191Sjkoshy DBG_SET_FLAG_MIN("swo", SWO); 429147191Sjkoshy DBG_SET_FLAG_MIN("start", STA); 430147191Sjkoshy DBG_SET_FLAG_MIN("stop", STO); 431147191Sjkoshy DBG_SET_FLAG_MIN("syscall", PMS); 432147191Sjkoshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 433147191Sjkoshy DBG_SET_FLAG_MIN("write", WRI); 434147191Sjkoshy if (found == 0) { 435147191Sjkoshy /* unrecognized flag name */ 436147191Sjkoshy error = EINVAL; 437147191Sjkoshy goto done; 438147191Sjkoshy } 439147191Sjkoshy 440147191Sjkoshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 441147191Sjkoshy *newbits = tmp; 442147191Sjkoshy continue; 443147191Sjkoshy } 444147191Sjkoshy 445147191Sjkoshy p++; 446147191Sjkoshy goto newflag; 447145256Sjkoshy } 448145256Sjkoshy 449147191Sjkoshy /* save the new flag set */ 450147191Sjkoshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 451145256Sjkoshy 452147191Sjkoshy done: 453147191Sjkoshy FREE(tmpflags, M_PMC); 454147191Sjkoshy return error; 455145256Sjkoshy} 456145256Sjkoshy 457145256Sjkoshystatic int 458145256Sjkoshypmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 459145256Sjkoshy{ 460145256Sjkoshy char *fence, *newstr; 461145256Sjkoshy int error; 462145256Sjkoshy unsigned int n; 463145256Sjkoshy 464145256Sjkoshy (void) arg1; (void) arg2; /* unused parameters */ 465145256Sjkoshy 466145256Sjkoshy n = sizeof(pmc_debugstr); 467145256Sjkoshy MALLOC(newstr, char *, n, M_PMC, M_ZERO|M_WAITOK); 468147191Sjkoshy (void) strlcpy(newstr, pmc_debugstr, n); 469145256Sjkoshy 470145256Sjkoshy error = sysctl_handle_string(oidp, newstr, n, req); 471145256Sjkoshy 472145256Sjkoshy /* if there is a new string, parse and copy it */ 473145256Sjkoshy if (error == 0 && req->newptr != NULL) { 474147191Sjkoshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 475145256Sjkoshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 476145256Sjkoshy (void) strlcpy(pmc_debugstr, newstr, 477145256Sjkoshy sizeof(pmc_debugstr)); 478145256Sjkoshy } 479145256Sjkoshy 480145256Sjkoshy FREE(newstr, M_PMC); 481145256Sjkoshy 482145256Sjkoshy return error; 483145256Sjkoshy} 484145256Sjkoshy#endif 485145256Sjkoshy 486145256Sjkoshy/* 487145256Sjkoshy * Concurrency Control 488145256Sjkoshy * 489145256Sjkoshy * The driver manages the following data structures: 490145256Sjkoshy * 491145256Sjkoshy * - target process descriptors, one per target process 492145256Sjkoshy * - owner process descriptors (and attached lists), one per owner process 493145256Sjkoshy * - lookup hash tables for owner and target processes 494145256Sjkoshy * - PMC descriptors (and attached lists) 495145256Sjkoshy * - per-cpu hardware state 496145256Sjkoshy * - the 'hook' variable through which the kernel calls into 497145256Sjkoshy * this module 498145256Sjkoshy * - the machine hardware state (managed by the MD layer) 499145256Sjkoshy * 500145256Sjkoshy * These data structures are accessed from: 501145256Sjkoshy * 502145256Sjkoshy * - thread context-switch code 503145256Sjkoshy * - interrupt handlers (possibly on multiple cpus) 504145256Sjkoshy * - kernel threads on multiple cpus running on behalf of user 505145256Sjkoshy * processes doing system calls 506145256Sjkoshy * - this driver's private kernel threads 507145256Sjkoshy * 508145256Sjkoshy * = Locks and Locking strategy = 509145256Sjkoshy * 510145256Sjkoshy * The driver uses four locking strategies for its operation: 511145256Sjkoshy * 512168856Sjkoshy * - The global SX lock "pmc_sx" is used to protect internal 513168856Sjkoshy * data structures. 514145256Sjkoshy * 515168856Sjkoshy * Calls into the module by syscall() start with this lock being 516168856Sjkoshy * held in exclusive mode. Depending on the requested operation, 517168856Sjkoshy * the lock may be downgraded to 'shared' mode to allow more 518168856Sjkoshy * concurrent readers into the module. Calls into the module from 519168856Sjkoshy * other parts of the kernel acquire the lock in shared mode. 520145256Sjkoshy * 521145256Sjkoshy * This SX lock is held in exclusive mode for any operations that 522145256Sjkoshy * modify the linkages between the driver's internal data structures. 523145256Sjkoshy * 524145256Sjkoshy * The 'pmc_hook' function pointer is also protected by this lock. 525145256Sjkoshy * It is only examined with the sx lock held in exclusive mode. The 526168856Sjkoshy * kernel module is allowed to be unloaded only with the sx lock held 527168856Sjkoshy * in exclusive mode. In normal syscall handling, after acquiring the 528168856Sjkoshy * pmc_sx lock we first check that 'pmc_hook' is non-null before 529168856Sjkoshy * proceeding. This prevents races between the thread unloading the module 530168856Sjkoshy * and other threads seeking to use the module. 531145256Sjkoshy * 532145256Sjkoshy * - Lookups of target process structures and owner process structures 533145256Sjkoshy * cannot use the global "pmc_sx" SX lock because these lookups need 534145256Sjkoshy * to happen during context switches and in other critical sections 535145256Sjkoshy * where sleeping is not allowed. We protect these lookup tables 536145256Sjkoshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 537168856Sjkoshy * "pmc_ownerhash_mtx". 538145256Sjkoshy * 539145256Sjkoshy * - Interrupt handlers work in a lock free manner. At interrupt 540145256Sjkoshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 541145256Sjkoshy * when the PMC was started. If this pointer is NULL, the interrupt 542145256Sjkoshy * is ignored after updating driver statistics. We ensure that this 543145256Sjkoshy * pointer is set (using an atomic operation if necessary) before the 544145256Sjkoshy * PMC hardware is started. Conversely, this pointer is unset atomically 545145256Sjkoshy * only after the PMC hardware is stopped. 546145256Sjkoshy * 547145256Sjkoshy * We ensure that everything needed for the operation of an 548145256Sjkoshy * interrupt handler is available without it needing to acquire any 549145256Sjkoshy * locks. We also ensure that a PMC's software state is destroyed only 550145256Sjkoshy * after the PMC is taken off hardware (on all CPUs). 551145256Sjkoshy * 552145256Sjkoshy * - Context-switch handling with process-private PMCs needs more 553145256Sjkoshy * care. 554145256Sjkoshy * 555145256Sjkoshy * A given process may be the target of multiple PMCs. For example, 556145256Sjkoshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 557145256Sjkoshy * while the target process is running on another. A PMC could also 558145256Sjkoshy * be getting released because its owner is exiting. We tackle 559145256Sjkoshy * these situations in the following manner: 560145256Sjkoshy * 561145256Sjkoshy * - each target process structure 'pmc_process' has an array 562145256Sjkoshy * of 'struct pmc *' pointers, one for each hardware PMC. 563145256Sjkoshy * 564145256Sjkoshy * - At context switch IN time, each "target" PMC in RUNNING state 565145256Sjkoshy * gets started on hardware and a pointer to each PMC is copied into 566145256Sjkoshy * the per-cpu phw array. The 'runcount' for the PMC is 567145256Sjkoshy * incremented. 568145256Sjkoshy * 569145256Sjkoshy * - At context switch OUT time, all process-virtual PMCs are stopped 570145256Sjkoshy * on hardware. The saved value is added to the PMCs value field 571145256Sjkoshy * only if the PMC is in a non-deleted state (the PMCs state could 572145256Sjkoshy * have changed during the current time slice). 573145256Sjkoshy * 574145256Sjkoshy * Note that since in-between a switch IN on a processor and a switch 575145256Sjkoshy * OUT, the PMC could have been released on another CPU. Therefore 576145256Sjkoshy * context switch OUT always looks at the hardware state to turn 577145256Sjkoshy * OFF PMCs and will update a PMC's saved value only if reachable 578145256Sjkoshy * from the target process record. 579145256Sjkoshy * 580145256Sjkoshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 581145256Sjkoshy * be attached to many processes at the time of the call and could 582145256Sjkoshy * be active on multiple CPUs). 583145256Sjkoshy * 584145256Sjkoshy * We prevent further scheduling of the PMC by marking it as in 585145256Sjkoshy * state 'DELETED'. If the runcount of the PMC is non-zero then 586145256Sjkoshy * this PMC is currently running on a CPU somewhere. The thread 587167086Sjhb * doing the PMCRELEASE operation waits by repeatedly doing a 588167086Sjhb * pause() till the runcount comes to zero. 589145256Sjkoshy * 590168856Sjkoshy * The contents of a PMC descriptor (struct pmc) are protected using 591168856Sjkoshy * a spin-mutex. In order to save space, we use a mutex pool. 592168856Sjkoshy * 593168856Sjkoshy * In terms of lock types used by witness(4), we use: 594168856Sjkoshy * - Type "pmc-sx", used by the global SX lock. 595168856Sjkoshy * - Type "pmc-sleep", for sleep mutexes used by logger threads. 596168856Sjkoshy * - Type "pmc-per-proc", for protecting PMC owner descriptors. 597168856Sjkoshy * - Type "pmc-leaf", used for all other spin mutexes. 598145256Sjkoshy */ 599145256Sjkoshy 600145256Sjkoshy/* 601145256Sjkoshy * save the cpu binding of the current kthread 602145256Sjkoshy */ 603145256Sjkoshy 604145256Sjkoshystatic void 605145256Sjkoshypmc_save_cpu_binding(struct pmc_binding *pb) 606145256Sjkoshy{ 607145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "save-cpu"); 608170307Sjeff thread_lock(curthread); 609145256Sjkoshy pb->pb_bound = sched_is_bound(curthread); 610145256Sjkoshy pb->pb_cpu = curthread->td_oncpu; 611170307Sjeff thread_unlock(curthread); 612145256Sjkoshy PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 613145256Sjkoshy} 614145256Sjkoshy 615145256Sjkoshy/* 616145256Sjkoshy * restore the cpu binding of the current thread 617145256Sjkoshy */ 618145256Sjkoshy 619145256Sjkoshystatic void 620145256Sjkoshypmc_restore_cpu_binding(struct pmc_binding *pb) 621145256Sjkoshy{ 622145256Sjkoshy PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 623145256Sjkoshy curthread->td_oncpu, pb->pb_cpu); 624170307Sjeff thread_lock(curthread); 625145256Sjkoshy if (pb->pb_bound) 626145256Sjkoshy sched_bind(curthread, pb->pb_cpu); 627145256Sjkoshy else 628145256Sjkoshy sched_unbind(curthread); 629170307Sjeff thread_unlock(curthread); 630145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "restore-cpu done"); 631145256Sjkoshy} 632145256Sjkoshy 633145256Sjkoshy/* 634145256Sjkoshy * move execution over the specified cpu and bind it there. 635145256Sjkoshy */ 636145256Sjkoshy 637145256Sjkoshystatic void 638145256Sjkoshypmc_select_cpu(int cpu) 639145256Sjkoshy{ 640145256Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 641145256Sjkoshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 642145256Sjkoshy 643145256Sjkoshy /* never move to a disabled CPU */ 644145256Sjkoshy KASSERT(pmc_cpu_is_disabled(cpu) == 0, ("[pmc,%d] selecting " 645145256Sjkoshy "disabled CPU %d", __LINE__, cpu)); 646145256Sjkoshy 647145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu); 648170307Sjeff thread_lock(curthread); 649145256Sjkoshy sched_bind(curthread, cpu); 650170307Sjeff thread_unlock(curthread); 651145256Sjkoshy 652145256Sjkoshy KASSERT(curthread->td_oncpu == cpu, 653145256Sjkoshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 654145256Sjkoshy cpu, curthread->td_oncpu)); 655145256Sjkoshy 656145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 657145256Sjkoshy} 658145256Sjkoshy 659145256Sjkoshy/* 660145774Sjkoshy * Force a context switch. 661145774Sjkoshy * 662167086Sjhb * We do this by pause'ing for 1 tick -- invoking mi_switch() is not 663145774Sjkoshy * guaranteed to force a context switch. 664145774Sjkoshy */ 665145774Sjkoshy 666145774Sjkoshystatic void 667145774Sjkoshypmc_force_context_switch(void) 668145774Sjkoshy{ 669145774Sjkoshy 670167086Sjhb pause("pmcctx", 1); 671145774Sjkoshy} 672145774Sjkoshy 673145774Sjkoshy/* 674147191Sjkoshy * Get the file name for an executable. This is a simple wrapper 675147191Sjkoshy * around vn_fullpath(9). 676145256Sjkoshy */ 677145256Sjkoshy 678147191Sjkoshystatic void 679147708Sjkoshypmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 680145256Sjkoshy{ 681145256Sjkoshy struct thread *td; 682145256Sjkoshy 683147191Sjkoshy td = curthread; 684147191Sjkoshy *fullpath = "unknown"; 685147191Sjkoshy *freepath = NULL; 686148088Sjkoshy vn_lock(v, LK_CANRECURSE | LK_EXCLUSIVE | LK_RETRY, td); 687147708Sjkoshy vn_fullpath(td, v, fullpath, freepath); 688147708Sjkoshy VOP_UNLOCK(v, 0, td); 689145256Sjkoshy} 690145256Sjkoshy 691145256Sjkoshy/* 692145256Sjkoshy * remove an process owning PMCs 693145256Sjkoshy */ 694145256Sjkoshy 695145256Sjkoshyvoid 696145256Sjkoshypmc_remove_owner(struct pmc_owner *po) 697145256Sjkoshy{ 698147191Sjkoshy struct pmc *pm, *tmp; 699145256Sjkoshy 700145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 701145256Sjkoshy 702145256Sjkoshy PMCDBG(OWN,ORM,1, "remove-owner po=%p", po); 703145256Sjkoshy 704145256Sjkoshy /* Remove descriptor from the owner hash table */ 705145256Sjkoshy LIST_REMOVE(po, po_next); 706145256Sjkoshy 707147191Sjkoshy /* release all owned PMC descriptors */ 708147191Sjkoshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 709147191Sjkoshy PMCDBG(OWN,ORM,2, "pmc=%p", pm); 710147191Sjkoshy KASSERT(pm->pm_owner == po, 711147191Sjkoshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 712145256Sjkoshy 713147191Sjkoshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 714145256Sjkoshy } 715145256Sjkoshy 716147191Sjkoshy KASSERT(po->po_sscount == 0, 717147191Sjkoshy ("[pmc,%d] SS count not zero", __LINE__)); 718145256Sjkoshy KASSERT(LIST_EMPTY(&po->po_pmcs), 719147191Sjkoshy ("[pmc,%d] PMC list not empty", __LINE__)); 720145256Sjkoshy 721147191Sjkoshy /* de-configure the log file if present */ 722145774Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 723147191Sjkoshy pmclog_deconfigure_log(po); 724145256Sjkoshy} 725145256Sjkoshy 726145256Sjkoshy/* 727145256Sjkoshy * remove an owner process record if all conditions are met. 728145256Sjkoshy */ 729145256Sjkoshy 730145256Sjkoshystatic void 731145256Sjkoshypmc_maybe_remove_owner(struct pmc_owner *po) 732145256Sjkoshy{ 733145256Sjkoshy 734145256Sjkoshy PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po); 735145256Sjkoshy 736145256Sjkoshy /* 737145256Sjkoshy * Remove owner record if 738145256Sjkoshy * - this process does not own any PMCs 739145256Sjkoshy * - this process has not allocated a system-wide sampling buffer 740145256Sjkoshy */ 741145256Sjkoshy 742145256Sjkoshy if (LIST_EMPTY(&po->po_pmcs) && 743145774Sjkoshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 744145256Sjkoshy pmc_remove_owner(po); 745147191Sjkoshy pmc_destroy_owner_descriptor(po); 746145256Sjkoshy } 747145256Sjkoshy} 748145256Sjkoshy 749145256Sjkoshy/* 750145256Sjkoshy * Add an association between a target process and a PMC. 751145256Sjkoshy */ 752145256Sjkoshy 753145256Sjkoshystatic void 754145256Sjkoshypmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 755145256Sjkoshy{ 756145256Sjkoshy int ri; 757145256Sjkoshy struct pmc_target *pt; 758145256Sjkoshy 759145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 760145256Sjkoshy 761145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 762145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 763147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 764147191Sjkoshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 765147191Sjkoshy __LINE__, pm, pp->pp_proc->p_pid)); 766145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < ((int) md->pmd_npmc - 1), 767145256Sjkoshy ("[pmc,%d] Illegal reference count %d for process record %p", 768145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 769145256Sjkoshy 770145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 771145256Sjkoshy 772145256Sjkoshy PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 773145256Sjkoshy pm, ri, pp); 774145256Sjkoshy 775153110Sru#ifdef DEBUG 776145256Sjkoshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 777145256Sjkoshy if (pt->pt_process == pp) 778145256Sjkoshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 779145256Sjkoshy __LINE__, pp, pm)); 780145256Sjkoshy#endif 781145256Sjkoshy 782145256Sjkoshy MALLOC(pt, struct pmc_target *, sizeof(struct pmc_target), 783145256Sjkoshy M_PMC, M_ZERO|M_WAITOK); 784145256Sjkoshy 785145256Sjkoshy pt->pt_process = pp; 786145256Sjkoshy 787145256Sjkoshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 788145256Sjkoshy 789148067Sjhb atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 790148067Sjhb (uintptr_t)pm); 791145256Sjkoshy 792145615Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) 793145774Sjkoshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 794145615Sjkoshy 795147191Sjkoshy /* 796147191Sjkoshy * Initialize the per-process values at this row index. 797147191Sjkoshy */ 798147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 799147191Sjkoshy pm->pm_sc.pm_reloadcount : 0; 800147191Sjkoshy 801145256Sjkoshy pp->pp_refcnt++; 802145256Sjkoshy 803145256Sjkoshy} 804145256Sjkoshy 805145256Sjkoshy/* 806145256Sjkoshy * Removes the association between a target process and a PMC. 807145256Sjkoshy */ 808145256Sjkoshy 809145256Sjkoshystatic void 810145256Sjkoshypmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 811145256Sjkoshy{ 812145256Sjkoshy int ri; 813147191Sjkoshy struct proc *p; 814145256Sjkoshy struct pmc_target *ptgt; 815145256Sjkoshy 816145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 817145256Sjkoshy 818145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 819145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 820145256Sjkoshy 821145256Sjkoshy KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt < (int) md->pmd_npmc, 822145256Sjkoshy ("[pmc,%d] Illegal ref count %d on process record %p", 823145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 824145256Sjkoshy 825145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 826145256Sjkoshy 827145256Sjkoshy PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 828145256Sjkoshy pm, ri, pp); 829145256Sjkoshy 830145256Sjkoshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 831145256Sjkoshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 832145256Sjkoshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 833145256Sjkoshy 834145256Sjkoshy pp->pp_pmcs[ri].pp_pmc = NULL; 835145256Sjkoshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 836145256Sjkoshy 837145774Sjkoshy /* Remove owner-specific flags */ 838145774Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) { 839145774Sjkoshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 840145774Sjkoshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 841145774Sjkoshy } 842145615Sjkoshy 843145256Sjkoshy pp->pp_refcnt--; 844145256Sjkoshy 845145256Sjkoshy /* Remove the target process from the PMC structure */ 846145256Sjkoshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 847145256Sjkoshy if (ptgt->pt_process == pp) 848145256Sjkoshy break; 849145256Sjkoshy 850145256Sjkoshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 851145256Sjkoshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 852145256Sjkoshy 853145256Sjkoshy LIST_REMOVE(ptgt, pt_next); 854145256Sjkoshy FREE(ptgt, M_PMC); 855145256Sjkoshy 856147191Sjkoshy /* if the PMC now lacks targets, send the owner a SIGIO */ 857147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) { 858147191Sjkoshy p = pm->pm_owner->po_owner; 859147191Sjkoshy PROC_LOCK(p); 860147191Sjkoshy psignal(p, SIGIO); 861147191Sjkoshy PROC_UNLOCK(p); 862145256Sjkoshy 863147191Sjkoshy PMCDBG(PRC,SIG,2, "signalling proc=%p signal=%d", p, 864147191Sjkoshy SIGIO); 865145256Sjkoshy } 866145256Sjkoshy} 867145256Sjkoshy 868145256Sjkoshy/* 869145256Sjkoshy * Check if PMC 'pm' may be attached to target process 't'. 870145256Sjkoshy */ 871145256Sjkoshy 872145256Sjkoshystatic int 873145256Sjkoshypmc_can_attach(struct pmc *pm, struct proc *t) 874145256Sjkoshy{ 875145256Sjkoshy struct proc *o; /* pmc owner */ 876145256Sjkoshy struct ucred *oc, *tc; /* owner, target credentials */ 877145256Sjkoshy int decline_attach, i; 878145256Sjkoshy 879145256Sjkoshy /* 880145256Sjkoshy * A PMC's owner can always attach that PMC to itself. 881145256Sjkoshy */ 882145256Sjkoshy 883145256Sjkoshy if ((o = pm->pm_owner->po_owner) == t) 884145256Sjkoshy return 0; 885145256Sjkoshy 886145256Sjkoshy PROC_LOCK(o); 887145256Sjkoshy oc = o->p_ucred; 888145256Sjkoshy crhold(oc); 889145256Sjkoshy PROC_UNLOCK(o); 890145256Sjkoshy 891145256Sjkoshy PROC_LOCK(t); 892145256Sjkoshy tc = t->p_ucred; 893145256Sjkoshy crhold(tc); 894145256Sjkoshy PROC_UNLOCK(t); 895145256Sjkoshy 896145256Sjkoshy /* 897145256Sjkoshy * The effective uid of the PMC owner should match at least one 898145256Sjkoshy * of the {effective,real,saved} uids of the target process. 899145256Sjkoshy */ 900145256Sjkoshy 901145256Sjkoshy decline_attach = oc->cr_uid != tc->cr_uid && 902145256Sjkoshy oc->cr_uid != tc->cr_svuid && 903145256Sjkoshy oc->cr_uid != tc->cr_ruid; 904145256Sjkoshy 905145256Sjkoshy /* 906145256Sjkoshy * Every one of the target's group ids, must be in the owner's 907145256Sjkoshy * group list. 908145256Sjkoshy */ 909145256Sjkoshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 910145256Sjkoshy decline_attach = !groupmember(tc->cr_groups[i], oc); 911145256Sjkoshy 912145256Sjkoshy /* check the read and saved gids too */ 913145256Sjkoshy if (decline_attach == 0) 914145256Sjkoshy decline_attach = !groupmember(tc->cr_rgid, oc) || 915145256Sjkoshy !groupmember(tc->cr_svgid, oc); 916145256Sjkoshy 917145256Sjkoshy crfree(tc); 918145256Sjkoshy crfree(oc); 919145256Sjkoshy 920145256Sjkoshy return !decline_attach; 921145256Sjkoshy} 922145256Sjkoshy 923145256Sjkoshy/* 924145256Sjkoshy * Attach a process to a PMC. 925145256Sjkoshy */ 926145256Sjkoshy 927145256Sjkoshystatic int 928145256Sjkoshypmc_attach_one_process(struct proc *p, struct pmc *pm) 929145256Sjkoshy{ 930145256Sjkoshy int ri; 931147191Sjkoshy char *fullpath, *freepath; 932145256Sjkoshy struct pmc_process *pp; 933145256Sjkoshy 934145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 935145256Sjkoshy 936145256Sjkoshy PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 937145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 938145256Sjkoshy 939145256Sjkoshy /* 940145256Sjkoshy * Locate the process descriptor corresponding to process 'p', 941145256Sjkoshy * allocating space as needed. 942145256Sjkoshy * 943145256Sjkoshy * Verify that rowindex 'pm_rowindex' is free in the process 944145256Sjkoshy * descriptor. 945145256Sjkoshy * 946145256Sjkoshy * If not, allocate space for a descriptor and link the 947145256Sjkoshy * process descriptor and PMC. 948145256Sjkoshy */ 949145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 950145256Sjkoshy 951145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 952145256Sjkoshy return ENOMEM; 953145256Sjkoshy 954145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 955145256Sjkoshy return EEXIST; 956145256Sjkoshy 957145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 958145256Sjkoshy return EBUSY; 959145256Sjkoshy 960145256Sjkoshy pmc_link_target_process(pm, pp); 961145256Sjkoshy 962147191Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 963147191Sjkoshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 964147191Sjkoshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 965147191Sjkoshy 966147191Sjkoshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 967147191Sjkoshy 968147191Sjkoshy /* issue an attach event to a configured log file */ 969147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 970147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 971147191Sjkoshy pmclog_process_pmcattach(pm, p->p_pid, fullpath); 972147191Sjkoshy if (freepath) 973147191Sjkoshy FREE(freepath, M_TEMP); 974174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 975174395Sjkoshy pmc_log_process_mappings(pm->pm_owner, p); 976147191Sjkoshy } 977145256Sjkoshy /* mark process as using HWPMCs */ 978145256Sjkoshy PROC_LOCK(p); 979145256Sjkoshy p->p_flag |= P_HWPMC; 980145256Sjkoshy PROC_UNLOCK(p); 981145256Sjkoshy 982145256Sjkoshy return 0; 983145256Sjkoshy} 984145256Sjkoshy 985145256Sjkoshy/* 986145256Sjkoshy * Attach a process and optionally its children 987145256Sjkoshy */ 988145256Sjkoshy 989145256Sjkoshystatic int 990145256Sjkoshypmc_attach_process(struct proc *p, struct pmc *pm) 991145256Sjkoshy{ 992145256Sjkoshy int error; 993145256Sjkoshy struct proc *top; 994145256Sjkoshy 995145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 996145256Sjkoshy 997145256Sjkoshy PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 998145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 999145256Sjkoshy 1000145774Sjkoshy 1001145774Sjkoshy /* 1002145774Sjkoshy * If this PMC successfully allowed a GETMSR operation 1003145774Sjkoshy * in the past, disallow further ATTACHes. 1004145774Sjkoshy */ 1005145774Sjkoshy 1006145774Sjkoshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 1007145774Sjkoshy return EPERM; 1008145774Sjkoshy 1009145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1010145256Sjkoshy return pmc_attach_one_process(p, pm); 1011145256Sjkoshy 1012145256Sjkoshy /* 1013145256Sjkoshy * Traverse all child processes, attaching them to 1014145256Sjkoshy * this PMC. 1015145256Sjkoshy */ 1016145256Sjkoshy 1017145256Sjkoshy sx_slock(&proctree_lock); 1018145256Sjkoshy 1019145256Sjkoshy top = p; 1020145256Sjkoshy 1021145256Sjkoshy for (;;) { 1022145256Sjkoshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1023145256Sjkoshy break; 1024145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1025145256Sjkoshy p = LIST_FIRST(&p->p_children); 1026145256Sjkoshy else for (;;) { 1027145256Sjkoshy if (p == top) 1028145256Sjkoshy goto done; 1029145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1030145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1031145256Sjkoshy break; 1032145256Sjkoshy } 1033145256Sjkoshy p = p->p_pptr; 1034145256Sjkoshy } 1035145256Sjkoshy } 1036145256Sjkoshy 1037145256Sjkoshy if (error) 1038145256Sjkoshy (void) pmc_detach_process(top, pm); 1039145256Sjkoshy 1040145256Sjkoshy done: 1041145256Sjkoshy sx_sunlock(&proctree_lock); 1042145256Sjkoshy return error; 1043145256Sjkoshy} 1044145256Sjkoshy 1045145256Sjkoshy/* 1046145256Sjkoshy * Detach a process from a PMC. If there are no other PMCs tracking 1047145256Sjkoshy * this process, remove the process structure from its hash table. If 1048145256Sjkoshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1049145256Sjkoshy */ 1050145256Sjkoshy 1051145256Sjkoshystatic int 1052145256Sjkoshypmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1053145256Sjkoshy{ 1054145256Sjkoshy int ri; 1055145256Sjkoshy struct pmc_process *pp; 1056145256Sjkoshy 1057145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1058145256Sjkoshy 1059145256Sjkoshy KASSERT(pm != NULL, 1060145256Sjkoshy ("[pmc,%d] null pm pointer", __LINE__)); 1061145256Sjkoshy 1062145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1063145774Sjkoshy 1064145256Sjkoshy PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1065145774Sjkoshy pm, ri, p, p->p_pid, p->p_comm, flags); 1066145256Sjkoshy 1067145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1068145256Sjkoshy return ESRCH; 1069145256Sjkoshy 1070145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1071145256Sjkoshy return EINVAL; 1072145256Sjkoshy 1073145256Sjkoshy pmc_unlink_target_process(pm, pp); 1074145256Sjkoshy 1075147191Sjkoshy /* Issue a detach entry if a log file is configured */ 1076147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1077147191Sjkoshy pmclog_process_pmcdetach(pm, p->p_pid); 1078147191Sjkoshy 1079145256Sjkoshy /* 1080145256Sjkoshy * If there are no PMCs targetting this process, we remove its 1081145256Sjkoshy * descriptor from the target hash table and unset the P_HWPMC 1082145256Sjkoshy * flag in the struct proc. 1083145256Sjkoshy */ 1084145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1085145256Sjkoshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1086145256Sjkoshy __LINE__, pp->pp_refcnt, pp)); 1087145256Sjkoshy 1088145256Sjkoshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1089145256Sjkoshy return 0; 1090145256Sjkoshy 1091145256Sjkoshy pmc_remove_process_descriptor(pp); 1092145256Sjkoshy 1093145256Sjkoshy if (flags & PMC_FLAG_REMOVE) 1094145256Sjkoshy FREE(pp, M_PMC); 1095145256Sjkoshy 1096145256Sjkoshy PROC_LOCK(p); 1097145256Sjkoshy p->p_flag &= ~P_HWPMC; 1098145256Sjkoshy PROC_UNLOCK(p); 1099145256Sjkoshy 1100145256Sjkoshy return 0; 1101145256Sjkoshy} 1102145256Sjkoshy 1103145256Sjkoshy/* 1104145256Sjkoshy * Detach a process and optionally its descendants from a PMC. 1105145256Sjkoshy */ 1106145256Sjkoshy 1107145256Sjkoshystatic int 1108145256Sjkoshypmc_detach_process(struct proc *p, struct pmc *pm) 1109145256Sjkoshy{ 1110145256Sjkoshy struct proc *top; 1111145256Sjkoshy 1112145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1113145256Sjkoshy 1114145256Sjkoshy PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1115145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1116145256Sjkoshy 1117145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1118145256Sjkoshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1119145256Sjkoshy 1120145256Sjkoshy /* 1121145256Sjkoshy * Traverse all children, detaching them from this PMC. We 1122145256Sjkoshy * ignore errors since we could be detaching a PMC from a 1123145256Sjkoshy * partially attached proc tree. 1124145256Sjkoshy */ 1125145256Sjkoshy 1126145256Sjkoshy sx_slock(&proctree_lock); 1127145256Sjkoshy 1128145256Sjkoshy top = p; 1129145256Sjkoshy 1130145256Sjkoshy for (;;) { 1131145256Sjkoshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1132145256Sjkoshy 1133145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1134145256Sjkoshy p = LIST_FIRST(&p->p_children); 1135145256Sjkoshy else for (;;) { 1136145256Sjkoshy if (p == top) 1137145256Sjkoshy goto done; 1138145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1139145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1140145256Sjkoshy break; 1141145256Sjkoshy } 1142145256Sjkoshy p = p->p_pptr; 1143145256Sjkoshy } 1144145256Sjkoshy } 1145145256Sjkoshy 1146145256Sjkoshy done: 1147145256Sjkoshy sx_sunlock(&proctree_lock); 1148147191Sjkoshy 1149147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 1150147191Sjkoshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1151147191Sjkoshy 1152145256Sjkoshy return 0; 1153145256Sjkoshy} 1154145256Sjkoshy 1155147191Sjkoshy 1156145256Sjkoshy/* 1157147191Sjkoshy * Thread context switch IN 1158145256Sjkoshy */ 1159145256Sjkoshy 1160147191Sjkoshystatic void 1161147191Sjkoshypmc_process_csw_in(struct thread *td) 1162147191Sjkoshy{ 1163147191Sjkoshy int cpu; 1164147191Sjkoshy unsigned int ri; 1165147191Sjkoshy struct pmc *pm; 1166147191Sjkoshy struct proc *p; 1167147191Sjkoshy struct pmc_cpu *pc; 1168147191Sjkoshy struct pmc_hw *phw; 1169147191Sjkoshy struct pmc_process *pp; 1170147191Sjkoshy pmc_value_t newvalue; 1171145256Sjkoshy 1172147191Sjkoshy p = td->td_proc; 1173145256Sjkoshy 1174147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1175147191Sjkoshy return; 1176145256Sjkoshy 1177147191Sjkoshy KASSERT(pp->pp_proc == td->td_proc, 1178147191Sjkoshy ("[pmc,%d] not my thread state", __LINE__)); 1179145256Sjkoshy 1180147191Sjkoshy critical_enter(); /* no preemption from this point */ 1181145256Sjkoshy 1182147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1183145256Sjkoshy 1184147191Sjkoshy PMCDBG(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1185147191Sjkoshy p->p_pid, p->p_comm, pp); 1186145256Sjkoshy 1187147191Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1188147191Sjkoshy ("[pmc,%d] wierd CPU id %d", __LINE__, cpu)); 1189145256Sjkoshy 1190147191Sjkoshy pc = pmc_pcpu[cpu]; 1191145256Sjkoshy 1192147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1193145256Sjkoshy 1194147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1195147191Sjkoshy continue; 1196147191Sjkoshy 1197147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1198147191Sjkoshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1199147191Sjkoshy __LINE__, PMC_TO_MODE(pm))); 1200147191Sjkoshy 1201147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1202147191Sjkoshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1203147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1204147191Sjkoshy 1205145256Sjkoshy /* 1206147191Sjkoshy * Only PMCs that are marked as 'RUNNING' need 1207147191Sjkoshy * be placed on hardware. 1208145256Sjkoshy */ 1209145256Sjkoshy 1210147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 1211147191Sjkoshy continue; 1212145256Sjkoshy 1213147191Sjkoshy /* increment PMC runcount */ 1214147191Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); 1215145256Sjkoshy 1216147191Sjkoshy /* configure the HWPMC we are going to use. */ 1217147191Sjkoshy md->pmd_config_pmc(cpu, ri, pm); 1218145256Sjkoshy 1219147191Sjkoshy phw = pc->pc_hwpmcs[ri]; 1220145256Sjkoshy 1221147191Sjkoshy KASSERT(phw != NULL, 1222147191Sjkoshy ("[pmc,%d] null hw pointer", __LINE__)); 1223145256Sjkoshy 1224147191Sjkoshy KASSERT(phw->phw_pmc == pm, 1225147191Sjkoshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1226147191Sjkoshy phw->phw_pmc, pm)); 1227145256Sjkoshy 1228147191Sjkoshy /* 1229147191Sjkoshy * Write out saved value and start the PMC. 1230147191Sjkoshy * 1231147191Sjkoshy * Sampling PMCs use a per-process value, while 1232147191Sjkoshy * counting mode PMCs use a per-pmc value that is 1233147191Sjkoshy * inherited across descendants. 1234147191Sjkoshy */ 1235147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1236147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1237147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1238147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval; 1239147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1240147191Sjkoshy } else { 1241147191Sjkoshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1242147191Sjkoshy ("[pmc,%d] illegal mode=%d", __LINE__, 1243147191Sjkoshy PMC_TO_MODE(pm))); 1244147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1245147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1246147191Sjkoshy pm->pm_gv.pm_savedvalue; 1247147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1248147191Sjkoshy } 1249145256Sjkoshy 1250147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1251145256Sjkoshy 1252147191Sjkoshy md->pmd_write_pmc(cpu, ri, newvalue); 1253147191Sjkoshy md->pmd_start_pmc(cpu, ri); 1254147191Sjkoshy } 1255145256Sjkoshy 1256147191Sjkoshy /* 1257147191Sjkoshy * perform any other architecture/cpu dependent thread 1258147191Sjkoshy * switch-in actions. 1259147191Sjkoshy */ 1260145256Sjkoshy 1261147191Sjkoshy (void) (*md->pmd_switch_in)(pc, pp); 1262145256Sjkoshy 1263147191Sjkoshy critical_exit(); 1264145256Sjkoshy 1265147191Sjkoshy} 1266145256Sjkoshy 1267147191Sjkoshy/* 1268147191Sjkoshy * Thread context switch OUT. 1269147191Sjkoshy */ 1270145256Sjkoshy 1271147191Sjkoshystatic void 1272147191Sjkoshypmc_process_csw_out(struct thread *td) 1273147191Sjkoshy{ 1274147191Sjkoshy int cpu; 1275147191Sjkoshy enum pmc_mode mode; 1276147191Sjkoshy unsigned int ri; 1277147191Sjkoshy struct pmc *pm; 1278147191Sjkoshy struct proc *p; 1279147191Sjkoshy struct pmc_cpu *pc; 1280147191Sjkoshy struct pmc_process *pp; 1281147191Sjkoshy int64_t tmp; 1282147191Sjkoshy pmc_value_t newvalue; 1283145256Sjkoshy 1284147191Sjkoshy /* 1285147191Sjkoshy * Locate our process descriptor; this may be NULL if 1286147191Sjkoshy * this process is exiting and we have already removed 1287147191Sjkoshy * the process from the target process table. 1288147191Sjkoshy * 1289147191Sjkoshy * Note that due to kernel preemption, multiple 1290147191Sjkoshy * context switches may happen while the process is 1291147191Sjkoshy * exiting. 1292147191Sjkoshy * 1293147191Sjkoshy * Note also that if the target process cannot be 1294147191Sjkoshy * found we still need to deconfigure any PMCs that 1295147191Sjkoshy * are currently running on hardware. 1296147191Sjkoshy */ 1297145256Sjkoshy 1298147191Sjkoshy p = td->td_proc; 1299147191Sjkoshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1300145256Sjkoshy 1301147191Sjkoshy /* 1302147191Sjkoshy * save PMCs 1303147191Sjkoshy */ 1304145256Sjkoshy 1305147191Sjkoshy critical_enter(); 1306145774Sjkoshy 1307147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1308145256Sjkoshy 1309147191Sjkoshy PMCDBG(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1310147191Sjkoshy p->p_pid, p->p_comm, pp); 1311145615Sjkoshy 1312147191Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1313147191Sjkoshy ("[pmc,%d wierd CPU id %d", __LINE__, cpu)); 1314145615Sjkoshy 1315147191Sjkoshy pc = pmc_pcpu[cpu]; 1316145615Sjkoshy 1317147191Sjkoshy /* 1318147191Sjkoshy * When a PMC gets unlinked from a target PMC, it will 1319147191Sjkoshy * be removed from the target's pp_pmc[] array. 1320147191Sjkoshy * 1321147191Sjkoshy * However, on a MP system, the target could have been 1322147191Sjkoshy * executing on another CPU at the time of the unlink. 1323147191Sjkoshy * So, at context switch OUT time, we need to look at 1324147191Sjkoshy * the hardware to determine if a PMC is scheduled on 1325147191Sjkoshy * it. 1326147191Sjkoshy */ 1327145256Sjkoshy 1328147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1329145256Sjkoshy 1330147191Sjkoshy pm = NULL; 1331147191Sjkoshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 1332145256Sjkoshy 1333147191Sjkoshy if (pm == NULL) /* nothing at this row index */ 1334147191Sjkoshy continue; 1335145256Sjkoshy 1336147191Sjkoshy mode = PMC_TO_MODE(pm); 1337147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1338147191Sjkoshy continue; /* not a process virtual PMC */ 1339145774Sjkoshy 1340147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1341147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1342147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1343145256Sjkoshy 1344147191Sjkoshy /* Stop hardware if not already stopped */ 1345147867Sjkoshy if (pm->pm_stalled == 0) 1346147191Sjkoshy md->pmd_stop_pmc(cpu, ri); 1347147191Sjkoshy 1348147191Sjkoshy /* reduce this PMC's runcount */ 1349147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 1350147191Sjkoshy 1351145256Sjkoshy /* 1352147191Sjkoshy * If this PMC is associated with this process, 1353147191Sjkoshy * save the reading. 1354145256Sjkoshy */ 1355145256Sjkoshy 1356147191Sjkoshy if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) { 1357147191Sjkoshy 1358147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1359147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1360147191Sjkoshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1361147191Sjkoshy 1362147191Sjkoshy KASSERT(pp->pp_refcnt > 0, 1363147191Sjkoshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1364147191Sjkoshy pp->pp_refcnt)); 1365147191Sjkoshy 1366147191Sjkoshy md->pmd_read_pmc(cpu, ri, &newvalue); 1367147191Sjkoshy 1368147191Sjkoshy tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1369147191Sjkoshy 1370147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d tmp=%jd", cpu, ri, 1371147191Sjkoshy tmp); 1372147191Sjkoshy 1373147191Sjkoshy if (mode == PMC_MODE_TS) { 1374147191Sjkoshy 1375147191Sjkoshy /* 1376147191Sjkoshy * For sampling process-virtual PMCs, 1377147191Sjkoshy * we expect the count to be 1378147191Sjkoshy * decreasing as the 'value' 1379147191Sjkoshy * programmed into the PMC is the 1380147191Sjkoshy * number of events to be seen till 1381147191Sjkoshy * the next sampling interrupt. 1382147191Sjkoshy */ 1383147191Sjkoshy if (tmp < 0) 1384147191Sjkoshy tmp += pm->pm_sc.pm_reloadcount; 1385147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1386147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval -= tmp; 1387147191Sjkoshy if ((int64_t) pp->pp_pmcs[ri].pp_pmcval < 0) 1388147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += 1389147191Sjkoshy pm->pm_sc.pm_reloadcount; 1390147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1391147191Sjkoshy 1392147191Sjkoshy } else { 1393147191Sjkoshy 1394147191Sjkoshy /* 1395147191Sjkoshy * For counting process-virtual PMCs, 1396147191Sjkoshy * we expect the count to be 1397147191Sjkoshy * increasing monotonically, modulo a 64 1398147191Sjkoshy * bit wraparound. 1399147191Sjkoshy */ 1400147191Sjkoshy KASSERT((int64_t) tmp >= 0, 1401147191Sjkoshy ("[pmc,%d] negative increment cpu=%d " 1402147191Sjkoshy "ri=%d newvalue=%jx saved=%jx " 1403147191Sjkoshy "incr=%jx", __LINE__, cpu, ri, 1404147191Sjkoshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1405147191Sjkoshy 1406147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1407147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 1408147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1409147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1410147191Sjkoshy 1411147191Sjkoshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1412147191Sjkoshy pmclog_process_proccsw(pm, pp, tmp); 1413147191Sjkoshy } 1414145256Sjkoshy } 1415145256Sjkoshy 1416147191Sjkoshy /* mark hardware as free */ 1417147191Sjkoshy md->pmd_config_pmc(cpu, ri, NULL); 1418145256Sjkoshy } 1419145256Sjkoshy 1420145256Sjkoshy /* 1421147191Sjkoshy * perform any other architecture/cpu dependent thread 1422147191Sjkoshy * switch out functions. 1423147191Sjkoshy */ 1424147191Sjkoshy 1425147191Sjkoshy (void) (*md->pmd_switch_out)(pc, pp); 1426147191Sjkoshy 1427147191Sjkoshy critical_exit(); 1428147191Sjkoshy} 1429147191Sjkoshy 1430147191Sjkoshy/* 1431157144Sjkoshy * Log a KLD operation. 1432157144Sjkoshy */ 1433157144Sjkoshy 1434157144Sjkoshystatic void 1435157144Sjkoshypmc_process_kld_load(struct pmckern_map_in *pkm) 1436157144Sjkoshy{ 1437157144Sjkoshy struct pmc_owner *po; 1438157144Sjkoshy 1439157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1440157144Sjkoshy 1441157144Sjkoshy /* 1442157144Sjkoshy * Notify owners of system sampling PMCs about KLD operations. 1443157144Sjkoshy */ 1444157144Sjkoshy 1445157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1446157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1447157144Sjkoshy pmclog_process_map_in(po, (pid_t) -1, pkm->pm_address, 1448157144Sjkoshy (char *) pkm->pm_file); 1449157144Sjkoshy 1450157144Sjkoshy /* 1451157144Sjkoshy * TODO: Notify owners of (all) process-sampling PMCs too. 1452157144Sjkoshy */ 1453157144Sjkoshy 1454157144Sjkoshy return; 1455157144Sjkoshy} 1456157144Sjkoshy 1457157144Sjkoshystatic void 1458157144Sjkoshypmc_process_kld_unload(struct pmckern_map_out *pkm) 1459157144Sjkoshy{ 1460157144Sjkoshy struct pmc_owner *po; 1461157144Sjkoshy 1462157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1463157144Sjkoshy 1464157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1465157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1466157144Sjkoshy pmclog_process_map_out(po, (pid_t) -1, 1467157144Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1468174395Sjkoshy 1469157144Sjkoshy /* 1470157144Sjkoshy * TODO: Notify owners of process-sampling PMCs. 1471157144Sjkoshy */ 1472157144Sjkoshy} 1473157144Sjkoshy 1474157144Sjkoshy/* 1475157144Sjkoshy * A mapping change for a process. 1476157144Sjkoshy */ 1477157144Sjkoshy 1478157144Sjkoshystatic void 1479157144Sjkoshypmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm) 1480157144Sjkoshy{ 1481157144Sjkoshy int ri; 1482157144Sjkoshy pid_t pid; 1483157144Sjkoshy char *fullpath, *freepath; 1484157144Sjkoshy const struct pmc *pm; 1485157144Sjkoshy struct pmc_owner *po; 1486157144Sjkoshy const struct pmc_process *pp; 1487157144Sjkoshy 1488157144Sjkoshy freepath = fullpath = NULL; 1489157144Sjkoshy pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath); 1490157144Sjkoshy 1491157144Sjkoshy pid = td->td_proc->p_pid; 1492157144Sjkoshy 1493157144Sjkoshy /* Inform owners of all system-wide sampling PMCs. */ 1494157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1495157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1496157144Sjkoshy pmclog_process_map_in(po, pid, pkm->pm_address, fullpath); 1497157144Sjkoshy 1498157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1499157144Sjkoshy goto done; 1500157144Sjkoshy 1501157144Sjkoshy /* 1502157144Sjkoshy * Inform sampling PMC owners tracking this process. 1503157144Sjkoshy */ 1504157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1505157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1506157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1507157144Sjkoshy pmclog_process_map_in(pm->pm_owner, 1508157144Sjkoshy pid, pkm->pm_address, fullpath); 1509157144Sjkoshy 1510157144Sjkoshy done: 1511157144Sjkoshy if (freepath) 1512157144Sjkoshy FREE(freepath, M_TEMP); 1513157144Sjkoshy} 1514157144Sjkoshy 1515157144Sjkoshy 1516157144Sjkoshy/* 1517157144Sjkoshy * Log an munmap request. 1518157144Sjkoshy */ 1519157144Sjkoshy 1520157144Sjkoshystatic void 1521157144Sjkoshypmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm) 1522157144Sjkoshy{ 1523157144Sjkoshy int ri; 1524157144Sjkoshy pid_t pid; 1525157144Sjkoshy struct pmc_owner *po; 1526157144Sjkoshy const struct pmc *pm; 1527157144Sjkoshy const struct pmc_process *pp; 1528157144Sjkoshy 1529157144Sjkoshy pid = td->td_proc->p_pid; 1530157144Sjkoshy 1531157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1532157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1533157144Sjkoshy pmclog_process_map_out(po, pid, pkm->pm_address, 1534157144Sjkoshy pkm->pm_address + pkm->pm_size); 1535157144Sjkoshy 1536157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1537157144Sjkoshy return; 1538157144Sjkoshy 1539157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1540157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1541157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1542157651Sjkoshy pmclog_process_map_out(pm->pm_owner, pid, 1543157651Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1544157144Sjkoshy} 1545157144Sjkoshy 1546157144Sjkoshy/* 1547174395Sjkoshy * Log mapping information about the kernel. 1548174395Sjkoshy */ 1549174395Sjkoshy 1550174395Sjkoshystatic void 1551174395Sjkoshypmc_log_kernel_mappings(struct pmc *pm) 1552174395Sjkoshy{ 1553174395Sjkoshy struct pmc_owner *po; 1554174395Sjkoshy struct pmckern_map_in *km, *kmbase; 1555174395Sjkoshy 1556174395Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1557174395Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 1558174395Sjkoshy ("[pmc,%d] non-sampling PMC (%p) desires mapping information", 1559174395Sjkoshy __LINE__, (void *) pm)); 1560174395Sjkoshy 1561174395Sjkoshy po = pm->pm_owner; 1562174395Sjkoshy 1563174395Sjkoshy if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE) 1564174395Sjkoshy return; 1565174395Sjkoshy 1566174395Sjkoshy /* 1567174395Sjkoshy * Log the current set of kernel modules. 1568174395Sjkoshy */ 1569174395Sjkoshy kmbase = linker_hwpmc_list_objects(); 1570174395Sjkoshy for (km = kmbase; km->pm_file != NULL; km++) { 1571174395Sjkoshy PMCDBG(LOG,REG,1,"%s %p", (char *) km->pm_file, 1572174395Sjkoshy (void *) km->pm_address); 1573174395Sjkoshy pmclog_process_map_in(po, (pid_t) -1, km->pm_address, 1574174395Sjkoshy km->pm_file); 1575174395Sjkoshy } 1576174395Sjkoshy FREE(kmbase, M_LINKER); 1577174395Sjkoshy 1578174395Sjkoshy po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE; 1579174395Sjkoshy} 1580174395Sjkoshy 1581174395Sjkoshy/* 1582174395Sjkoshy * Log the mappings for a single process. 1583174395Sjkoshy */ 1584174395Sjkoshy 1585174395Sjkoshystatic void 1586174395Sjkoshypmc_log_process_mappings(struct pmc_owner *po, struct proc *p) 1587174395Sjkoshy{ 1588174395Sjkoshy} 1589174395Sjkoshy 1590174395Sjkoshy/* 1591174395Sjkoshy * Log mappings for all processes in the system. 1592174395Sjkoshy */ 1593174395Sjkoshy 1594174395Sjkoshystatic void 1595174395Sjkoshypmc_log_all_process_mappings(struct pmc_owner *po) 1596174395Sjkoshy{ 1597174395Sjkoshy struct proc *p, *top; 1598174395Sjkoshy 1599174395Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1600174395Sjkoshy 1601174395Sjkoshy if ((p = pfind(1)) == NULL) 1602174395Sjkoshy panic("[pmc,%d] Cannot find init", __LINE__); 1603174395Sjkoshy 1604174395Sjkoshy PROC_UNLOCK(p); 1605174395Sjkoshy 1606174395Sjkoshy sx_slock(&proctree_lock); 1607174395Sjkoshy 1608174395Sjkoshy top = p; 1609174395Sjkoshy 1610174395Sjkoshy for (;;) { 1611174395Sjkoshy pmc_log_process_mappings(po, p); 1612174395Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1613174395Sjkoshy p = LIST_FIRST(&p->p_children); 1614174395Sjkoshy else for (;;) { 1615174395Sjkoshy if (p == top) 1616174395Sjkoshy goto done; 1617174395Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1618174395Sjkoshy p = LIST_NEXT(p, p_sibling); 1619174395Sjkoshy break; 1620174395Sjkoshy } 1621174395Sjkoshy p = p->p_pptr; 1622174395Sjkoshy } 1623174395Sjkoshy } 1624174395Sjkoshy done: 1625174395Sjkoshy sx_sunlock(&proctree_lock); 1626174395Sjkoshy} 1627174395Sjkoshy 1628174395Sjkoshy/* 1629147191Sjkoshy * The 'hook' invoked from the kernel proper 1630147191Sjkoshy */ 1631147191Sjkoshy 1632147191Sjkoshy 1633153110Sru#ifdef DEBUG 1634147191Sjkoshyconst char *pmc_hooknames[] = { 1635157144Sjkoshy /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */ 1636147191Sjkoshy "", 1637147191Sjkoshy "EXEC", 1638147191Sjkoshy "CSW-IN", 1639147191Sjkoshy "CSW-OUT", 1640157144Sjkoshy "SAMPLE", 1641157144Sjkoshy "KLDLOAD", 1642157144Sjkoshy "KLDUNLOAD", 1643157144Sjkoshy "MMAP", 1644174395Sjkoshy "MUNMAP", 1645174395Sjkoshy "CALLCHAIN" 1646147191Sjkoshy}; 1647147191Sjkoshy#endif 1648147191Sjkoshy 1649147191Sjkoshystatic int 1650147191Sjkoshypmc_hook_handler(struct thread *td, int function, void *arg) 1651147191Sjkoshy{ 1652147191Sjkoshy 1653147191Sjkoshy PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1654147191Sjkoshy pmc_hooknames[function], arg); 1655147191Sjkoshy 1656147191Sjkoshy switch (function) 1657147191Sjkoshy { 1658147191Sjkoshy 1659147191Sjkoshy /* 1660145256Sjkoshy * Process exec() 1661145256Sjkoshy */ 1662145256Sjkoshy 1663145256Sjkoshy case PMC_FN_PROCESS_EXEC: 1664145256Sjkoshy { 1665147191Sjkoshy char *fullpath, *freepath; 1666145256Sjkoshy unsigned int ri; 1667147191Sjkoshy int is_using_hwpmcs; 1668145256Sjkoshy struct pmc *pm; 1669145256Sjkoshy struct proc *p; 1670145256Sjkoshy struct pmc_owner *po; 1671145256Sjkoshy struct pmc_process *pp; 1672147708Sjkoshy struct pmckern_procexec *pk; 1673145256Sjkoshy 1674145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1675145256Sjkoshy 1676147191Sjkoshy p = td->td_proc; 1677147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1678147191Sjkoshy 1679147708Sjkoshy pk = (struct pmckern_procexec *) arg; 1680147708Sjkoshy 1681147191Sjkoshy /* Inform owners of SS mode PMCs of the exec event. */ 1682147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1683147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1684147708Sjkoshy pmclog_process_procexec(po, PMC_ID_INVALID, 1685147708Sjkoshy p->p_pid, pk->pm_entryaddr, fullpath); 1686147191Sjkoshy 1687147191Sjkoshy PROC_LOCK(p); 1688147191Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1689147191Sjkoshy PROC_UNLOCK(p); 1690147191Sjkoshy 1691147191Sjkoshy if (!is_using_hwpmcs) { 1692147191Sjkoshy if (freepath) 1693147191Sjkoshy FREE(freepath, M_TEMP); 1694147191Sjkoshy break; 1695147191Sjkoshy } 1696147191Sjkoshy 1697145256Sjkoshy /* 1698145256Sjkoshy * PMCs are not inherited across an exec(): remove any 1699145256Sjkoshy * PMCs that this process is the owner of. 1700145256Sjkoshy */ 1701145256Sjkoshy 1702145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1703145256Sjkoshy pmc_remove_owner(po); 1704147191Sjkoshy pmc_destroy_owner_descriptor(po); 1705145256Sjkoshy } 1706145256Sjkoshy 1707145256Sjkoshy /* 1708154483Sjkoshy * If the process being exec'ed is not the target of any 1709154483Sjkoshy * PMC, we are done. 1710145256Sjkoshy */ 1711154483Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 1712154483Sjkoshy if (freepath) 1713154483Sjkoshy FREE(freepath, M_TEMP); 1714145256Sjkoshy break; 1715154483Sjkoshy } 1716145256Sjkoshy 1717147191Sjkoshy /* 1718147191Sjkoshy * Log the exec event to all monitoring owners. Skip 1719147191Sjkoshy * owners who have already recieved the event because 1720154483Sjkoshy * they had system sampling PMCs active. 1721147191Sjkoshy */ 1722147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1723147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1724147191Sjkoshy po = pm->pm_owner; 1725147191Sjkoshy if (po->po_sscount == 0 && 1726147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 1727147708Sjkoshy pmclog_process_procexec(po, pm->pm_id, 1728147708Sjkoshy p->p_pid, pk->pm_entryaddr, 1729147191Sjkoshy fullpath); 1730147191Sjkoshy } 1731147191Sjkoshy 1732147191Sjkoshy if (freepath) 1733147191Sjkoshy FREE(freepath, M_TEMP); 1734147191Sjkoshy 1735145256Sjkoshy 1736145256Sjkoshy PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 1737147708Sjkoshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1738145256Sjkoshy 1739147708Sjkoshy if (pk->pm_credentialschanged == 0) /* no change */ 1740145256Sjkoshy break; 1741145256Sjkoshy 1742145256Sjkoshy /* 1743145256Sjkoshy * If the newly exec()'ed process has a different credential 1744145256Sjkoshy * than before, allow it to be the target of a PMC only if 1745145256Sjkoshy * the PMC's owner has sufficient priviledge. 1746145256Sjkoshy */ 1747145256Sjkoshy 1748145256Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1749145256Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1750145256Sjkoshy if (pmc_can_attach(pm, td->td_proc) != 0) 1751145256Sjkoshy pmc_detach_one_process(td->td_proc, 1752145256Sjkoshy pm, PMC_FLAG_NONE); 1753145256Sjkoshy 1754145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1755145256Sjkoshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1756145256Sjkoshy pp->pp_refcnt, pp)); 1757145256Sjkoshy 1758145256Sjkoshy /* 1759145256Sjkoshy * If this process is no longer the target of any 1760145256Sjkoshy * PMCs, we can remove the process entry and free 1761145256Sjkoshy * up space. 1762145256Sjkoshy */ 1763145256Sjkoshy 1764145256Sjkoshy if (pp->pp_refcnt == 0) { 1765145256Sjkoshy pmc_remove_process_descriptor(pp); 1766145256Sjkoshy FREE(pp, M_PMC); 1767147191Sjkoshy break; 1768145256Sjkoshy } 1769145256Sjkoshy 1770145256Sjkoshy } 1771145256Sjkoshy break; 1772145256Sjkoshy 1773145256Sjkoshy case PMC_FN_CSW_IN: 1774147191Sjkoshy pmc_process_csw_in(td); 1775147191Sjkoshy break; 1776145256Sjkoshy 1777147191Sjkoshy case PMC_FN_CSW_OUT: 1778147191Sjkoshy pmc_process_csw_out(td); 1779147191Sjkoshy break; 1780145256Sjkoshy 1781145256Sjkoshy /* 1782147191Sjkoshy * Process accumulated PC samples. 1783147191Sjkoshy * 1784147191Sjkoshy * This function is expected to be called by hardclock() for 1785147191Sjkoshy * each CPU that has accumulated PC samples. 1786147191Sjkoshy * 1787147191Sjkoshy * This function is to be executed on the CPU whose samples 1788147191Sjkoshy * are being processed. 1789145256Sjkoshy */ 1790147191Sjkoshy case PMC_FN_DO_SAMPLES: 1791145256Sjkoshy 1792145256Sjkoshy /* 1793147191Sjkoshy * Clear the cpu specific bit in the CPU mask before 1794147191Sjkoshy * do the rest of the processing. If the NMI handler 1795147191Sjkoshy * gets invoked after the "atomic_clear_int()" call 1796147191Sjkoshy * below but before "pmc_process_samples()" gets 1797147191Sjkoshy * around to processing the interrupt, then we will 1798147191Sjkoshy * come back here at the next hardclock() tick (and 1799147191Sjkoshy * may find nothing to do if "pmc_process_samples()" 1800147191Sjkoshy * had already processed the interrupt). We don't 1801147191Sjkoshy * lose the interrupt sample. 1802145256Sjkoshy */ 1803147191Sjkoshy atomic_clear_int(&pmc_cpumask, (1 << PCPU_GET(cpuid))); 1804147191Sjkoshy pmc_process_samples(PCPU_GET(cpuid)); 1805147191Sjkoshy break; 1806145256Sjkoshy 1807157144Sjkoshy 1808157144Sjkoshy case PMC_FN_KLD_LOAD: 1809157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1810157144Sjkoshy pmc_process_kld_load((struct pmckern_map_in *) arg); 1811157144Sjkoshy break; 1812157144Sjkoshy 1813157144Sjkoshy case PMC_FN_KLD_UNLOAD: 1814157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1815157144Sjkoshy pmc_process_kld_unload((struct pmckern_map_out *) arg); 1816157144Sjkoshy break; 1817157144Sjkoshy 1818157144Sjkoshy case PMC_FN_MMAP: 1819157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1820157144Sjkoshy pmc_process_mmap(td, (struct pmckern_map_in *) arg); 1821157144Sjkoshy break; 1822157144Sjkoshy 1823157144Sjkoshy case PMC_FN_MUNMAP: 1824157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1825157144Sjkoshy pmc_process_munmap(td, (struct pmckern_map_out *) arg); 1826157144Sjkoshy break; 1827157144Sjkoshy 1828174395Sjkoshy case PMC_FN_USER_CALLCHAIN: 1829174395Sjkoshy /* 1830174395Sjkoshy * Record a call chain. 1831174395Sjkoshy */ 1832174395Sjkoshy pmc_capture_user_callchain(PCPU_GET(cpuid), 1833174395Sjkoshy (struct trapframe *) arg); 1834174395Sjkoshy break; 1835174395Sjkoshy 1836145256Sjkoshy default: 1837153110Sru#ifdef DEBUG 1838145256Sjkoshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 1839145256Sjkoshy#endif 1840145256Sjkoshy break; 1841145256Sjkoshy 1842145256Sjkoshy } 1843145256Sjkoshy 1844145256Sjkoshy return 0; 1845145256Sjkoshy} 1846145256Sjkoshy 1847145256Sjkoshy/* 1848145256Sjkoshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 1849145256Sjkoshy */ 1850145256Sjkoshy 1851145256Sjkoshystatic struct pmc_owner * 1852145256Sjkoshypmc_allocate_owner_descriptor(struct proc *p) 1853145256Sjkoshy{ 1854145256Sjkoshy uint32_t hindex; 1855145256Sjkoshy struct pmc_owner *po; 1856145256Sjkoshy struct pmc_ownerhash *poh; 1857145256Sjkoshy 1858145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1859145256Sjkoshy poh = &pmc_ownerhash[hindex]; 1860145256Sjkoshy 1861145256Sjkoshy /* allocate space for N pointers and one descriptor struct */ 1862145256Sjkoshy MALLOC(po, struct pmc_owner *, sizeof(struct pmc_owner), 1863147191Sjkoshy M_PMC, M_ZERO|M_WAITOK); 1864145256Sjkoshy 1865147191Sjkoshy po->po_sscount = po->po_error = po->po_flags = 0; 1866147191Sjkoshy po->po_file = NULL; 1867145256Sjkoshy po->po_owner = p; 1868147191Sjkoshy po->po_kthread = NULL; 1869145256Sjkoshy LIST_INIT(&po->po_pmcs); 1870145256Sjkoshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 1871145256Sjkoshy 1872147191Sjkoshy TAILQ_INIT(&po->po_logbuffers); 1873168856Sjkoshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN); 1874147191Sjkoshy 1875145256Sjkoshy PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 1876145256Sjkoshy p, p->p_pid, p->p_comm, po); 1877145256Sjkoshy 1878145256Sjkoshy return po; 1879145256Sjkoshy} 1880145256Sjkoshy 1881147191Sjkoshystatic void 1882147191Sjkoshypmc_destroy_owner_descriptor(struct pmc_owner *po) 1883147191Sjkoshy{ 1884147191Sjkoshy 1885147191Sjkoshy PMCDBG(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 1886147191Sjkoshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 1887147191Sjkoshy 1888147191Sjkoshy mtx_destroy(&po->po_mtx); 1889147191Sjkoshy FREE(po, M_PMC); 1890147191Sjkoshy} 1891147191Sjkoshy 1892145256Sjkoshy/* 1893145256Sjkoshy * find the descriptor corresponding to process 'p', adding or removing it 1894145256Sjkoshy * as specified by 'mode'. 1895145256Sjkoshy */ 1896145256Sjkoshy 1897145256Sjkoshystatic struct pmc_process * 1898145256Sjkoshypmc_find_process_descriptor(struct proc *p, uint32_t mode) 1899145256Sjkoshy{ 1900145256Sjkoshy uint32_t hindex; 1901145256Sjkoshy struct pmc_process *pp, *ppnew; 1902145256Sjkoshy struct pmc_processhash *pph; 1903145256Sjkoshy 1904145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 1905145256Sjkoshy pph = &pmc_processhash[hindex]; 1906145256Sjkoshy 1907145256Sjkoshy ppnew = NULL; 1908145256Sjkoshy 1909145256Sjkoshy /* 1910145256Sjkoshy * Pre-allocate memory in the FIND_ALLOCATE case since we 1911145256Sjkoshy * cannot call malloc(9) once we hold a spin lock. 1912145256Sjkoshy */ 1913145256Sjkoshy 1914145256Sjkoshy if (mode & PMC_FLAG_ALLOCATE) { 1915145256Sjkoshy /* allocate additional space for 'n' pmc pointers */ 1916145256Sjkoshy MALLOC(ppnew, struct pmc_process *, 1917145256Sjkoshy sizeof(struct pmc_process) + md->pmd_npmc * 1918145256Sjkoshy sizeof(struct pmc_targetstate), M_PMC, M_ZERO|M_WAITOK); 1919145256Sjkoshy } 1920145256Sjkoshy 1921145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1922145256Sjkoshy LIST_FOREACH(pp, pph, pp_next) 1923145256Sjkoshy if (pp->pp_proc == p) 1924145256Sjkoshy break; 1925145256Sjkoshy 1926145256Sjkoshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 1927145256Sjkoshy LIST_REMOVE(pp, pp_next); 1928145256Sjkoshy 1929145256Sjkoshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 1930145256Sjkoshy ppnew != NULL) { 1931145256Sjkoshy ppnew->pp_proc = p; 1932145256Sjkoshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 1933145256Sjkoshy pp = ppnew; 1934145256Sjkoshy ppnew = NULL; 1935145256Sjkoshy } 1936145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1937145256Sjkoshy 1938145256Sjkoshy if (pp != NULL && ppnew != NULL) 1939145256Sjkoshy FREE(ppnew, M_PMC); 1940145256Sjkoshy 1941145256Sjkoshy return pp; 1942145256Sjkoshy} 1943145256Sjkoshy 1944145256Sjkoshy/* 1945145256Sjkoshy * remove a process descriptor from the process hash table. 1946145256Sjkoshy */ 1947145256Sjkoshy 1948145256Sjkoshystatic void 1949145256Sjkoshypmc_remove_process_descriptor(struct pmc_process *pp) 1950145256Sjkoshy{ 1951145256Sjkoshy KASSERT(pp->pp_refcnt == 0, 1952145256Sjkoshy ("[pmc,%d] Removing process descriptor %p with count %d", 1953145256Sjkoshy __LINE__, pp, pp->pp_refcnt)); 1954145256Sjkoshy 1955145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1956145256Sjkoshy LIST_REMOVE(pp, pp_next); 1957145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1958145256Sjkoshy} 1959145256Sjkoshy 1960145256Sjkoshy 1961145256Sjkoshy/* 1962145256Sjkoshy * find an owner descriptor corresponding to proc 'p' 1963145256Sjkoshy */ 1964145256Sjkoshy 1965145256Sjkoshystatic struct pmc_owner * 1966145256Sjkoshypmc_find_owner_descriptor(struct proc *p) 1967145256Sjkoshy{ 1968145256Sjkoshy uint32_t hindex; 1969145256Sjkoshy struct pmc_owner *po; 1970145256Sjkoshy struct pmc_ownerhash *poh; 1971145256Sjkoshy 1972145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1973145256Sjkoshy poh = &pmc_ownerhash[hindex]; 1974145256Sjkoshy 1975145256Sjkoshy po = NULL; 1976145256Sjkoshy LIST_FOREACH(po, poh, po_next) 1977145256Sjkoshy if (po->po_owner == p) 1978145256Sjkoshy break; 1979145256Sjkoshy 1980145256Sjkoshy PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 1981145256Sjkoshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 1982145256Sjkoshy 1983145256Sjkoshy return po; 1984145256Sjkoshy} 1985145256Sjkoshy 1986145256Sjkoshy/* 1987145256Sjkoshy * pmc_allocate_pmc_descriptor 1988145256Sjkoshy * 1989145256Sjkoshy * Allocate a pmc descriptor and initialize its 1990145256Sjkoshy * fields. 1991145256Sjkoshy */ 1992145256Sjkoshy 1993145256Sjkoshystatic struct pmc * 1994145256Sjkoshypmc_allocate_pmc_descriptor(void) 1995145256Sjkoshy{ 1996145256Sjkoshy struct pmc *pmc; 1997145256Sjkoshy 1998145256Sjkoshy MALLOC(pmc, struct pmc *, sizeof(struct pmc), M_PMC, M_ZERO|M_WAITOK); 1999145256Sjkoshy 2000145256Sjkoshy if (pmc != NULL) { 2001145256Sjkoshy pmc->pm_owner = NULL; 2002145256Sjkoshy LIST_INIT(&pmc->pm_targets); 2003145256Sjkoshy } 2004145256Sjkoshy 2005145256Sjkoshy PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 2006145256Sjkoshy 2007145256Sjkoshy return pmc; 2008145256Sjkoshy} 2009145256Sjkoshy 2010145256Sjkoshy/* 2011145256Sjkoshy * Destroy a pmc descriptor. 2012145256Sjkoshy */ 2013145256Sjkoshy 2014145256Sjkoshystatic void 2015145256Sjkoshypmc_destroy_pmc_descriptor(struct pmc *pm) 2016145256Sjkoshy{ 2017145256Sjkoshy (void) pm; 2018145256Sjkoshy 2019153110Sru#ifdef DEBUG 2020145256Sjkoshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 2021145256Sjkoshy pm->pm_state == PMC_STATE_FREE, 2022145256Sjkoshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 2023145256Sjkoshy KASSERT(LIST_EMPTY(&pm->pm_targets), 2024145256Sjkoshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 2025145256Sjkoshy KASSERT(pm->pm_owner == NULL, 2026145256Sjkoshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 2027145256Sjkoshy KASSERT(pm->pm_runcount == 0, 2028145256Sjkoshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 2029145256Sjkoshy pm->pm_runcount)); 2030145256Sjkoshy#endif 2031145256Sjkoshy} 2032145256Sjkoshy 2033147191Sjkoshystatic void 2034147191Sjkoshypmc_wait_for_pmc_idle(struct pmc *pm) 2035147191Sjkoshy{ 2036153110Sru#ifdef DEBUG 2037147191Sjkoshy volatile int maxloop; 2038147191Sjkoshy 2039147191Sjkoshy maxloop = 100 * mp_ncpus; 2040147191Sjkoshy#endif 2041147191Sjkoshy 2042147191Sjkoshy /* 2043147191Sjkoshy * Loop (with a forced context switch) till the PMC's runcount 2044147191Sjkoshy * comes down to zero. 2045147191Sjkoshy */ 2046147191Sjkoshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 2047153110Sru#ifdef DEBUG 2048147191Sjkoshy maxloop--; 2049147191Sjkoshy KASSERT(maxloop > 0, 2050147191Sjkoshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 2051147191Sjkoshy "pmc to be free", __LINE__, 2052147191Sjkoshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 2053147191Sjkoshy#endif 2054147191Sjkoshy pmc_force_context_switch(); 2055147191Sjkoshy } 2056147191Sjkoshy} 2057147191Sjkoshy 2058145256Sjkoshy/* 2059145256Sjkoshy * This function does the following things: 2060145256Sjkoshy * 2061145256Sjkoshy * - detaches the PMC from hardware 2062145256Sjkoshy * - unlinks all target threads that were attached to it 2063145256Sjkoshy * - removes the PMC from its owner's list 2064145256Sjkoshy * - destroy's the PMC private mutex 2065145256Sjkoshy * 2066145256Sjkoshy * Once this function completes, the given pmc pointer can be safely 2067145256Sjkoshy * FREE'd by the caller. 2068145256Sjkoshy */ 2069145256Sjkoshy 2070145256Sjkoshystatic void 2071145256Sjkoshypmc_release_pmc_descriptor(struct pmc *pm) 2072145256Sjkoshy{ 2073145256Sjkoshy u_int ri, cpu; 2074145774Sjkoshy enum pmc_mode mode; 2075145256Sjkoshy struct pmc_hw *phw; 2076147191Sjkoshy struct pmc_owner *po; 2077145256Sjkoshy struct pmc_process *pp; 2078145256Sjkoshy struct pmc_target *ptgt, *tmp; 2079145256Sjkoshy struct pmc_binding pb; 2080145256Sjkoshy 2081145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2082145256Sjkoshy 2083145256Sjkoshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 2084145256Sjkoshy 2085145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2086145774Sjkoshy mode = PMC_TO_MODE(pm); 2087145256Sjkoshy 2088145256Sjkoshy PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 2089145774Sjkoshy mode); 2090145256Sjkoshy 2091145256Sjkoshy /* 2092145256Sjkoshy * First, we take the PMC off hardware. 2093145256Sjkoshy */ 2094145301Simp cpu = 0; 2095145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2096145256Sjkoshy 2097145256Sjkoshy /* 2098145256Sjkoshy * A system mode PMC runs on a specific CPU. Switch 2099145256Sjkoshy * to this CPU and turn hardware off. 2100145256Sjkoshy */ 2101145256Sjkoshy pmc_save_cpu_binding(&pb); 2102145256Sjkoshy 2103145774Sjkoshy cpu = PMC_TO_CPU(pm); 2104145256Sjkoshy 2105147191Sjkoshy pmc_select_cpu(cpu); 2106145256Sjkoshy 2107147191Sjkoshy /* switch off non-stalled CPUs */ 2108147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 2109147867Sjkoshy pm->pm_stalled == 0) { 2110145256Sjkoshy 2111145256Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 2112145256Sjkoshy 2113145256Sjkoshy KASSERT(phw->phw_pmc == pm, 2114145256Sjkoshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 2115145256Sjkoshy __LINE__, ri, phw->phw_pmc, pm)); 2116145256Sjkoshy PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 2117145256Sjkoshy 2118145256Sjkoshy critical_enter(); 2119145256Sjkoshy md->pmd_stop_pmc(cpu, ri); 2120145256Sjkoshy critical_exit(); 2121145256Sjkoshy } 2122145256Sjkoshy 2123145256Sjkoshy PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 2124145256Sjkoshy 2125145256Sjkoshy critical_enter(); 2126145256Sjkoshy md->pmd_config_pmc(cpu, ri, NULL); 2127145256Sjkoshy critical_exit(); 2128145256Sjkoshy 2129147191Sjkoshy /* adjust the global and process count of SS mode PMCs */ 2130147191Sjkoshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 2131147191Sjkoshy po = pm->pm_owner; 2132147191Sjkoshy po->po_sscount--; 2133147191Sjkoshy if (po->po_sscount == 0) { 2134147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2135147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2136147191Sjkoshy } 2137147191Sjkoshy } 2138147191Sjkoshy 2139145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2140145256Sjkoshy 2141145256Sjkoshy pmc_restore_cpu_binding(&pb); 2142145256Sjkoshy 2143147191Sjkoshy /* 2144147191Sjkoshy * We could have references to this PMC structure in 2145147191Sjkoshy * the per-cpu sample queues. Wait for the queue to 2146147191Sjkoshy * drain. 2147147191Sjkoshy */ 2148147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2149147191Sjkoshy 2150145774Sjkoshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 2151145256Sjkoshy 2152145256Sjkoshy /* 2153145256Sjkoshy * A virtual PMC could be running on multiple CPUs at 2154145256Sjkoshy * a given instant. 2155145256Sjkoshy * 2156145256Sjkoshy * By marking its state as DELETED, we ensure that 2157145256Sjkoshy * this PMC is never further scheduled on hardware. 2158145256Sjkoshy * 2159145256Sjkoshy * Then we wait till all CPUs are done with this PMC. 2160145256Sjkoshy */ 2161145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2162145256Sjkoshy 2163145256Sjkoshy 2164147191Sjkoshy /* Wait for the PMCs runcount to come to zero. */ 2165147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2166145256Sjkoshy 2167145256Sjkoshy /* 2168145256Sjkoshy * At this point the PMC is off all CPUs and cannot be 2169145256Sjkoshy * freshly scheduled onto a CPU. It is now safe to 2170145256Sjkoshy * unlink all targets from this PMC. If a 2171145256Sjkoshy * process-record's refcount falls to zero, we remove 2172145256Sjkoshy * it from the hash table. The module-wide SX lock 2173145256Sjkoshy * protects us from races. 2174145256Sjkoshy */ 2175145256Sjkoshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 2176145256Sjkoshy pp = ptgt->pt_process; 2177145256Sjkoshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 2178145256Sjkoshy 2179145256Sjkoshy PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 2180145256Sjkoshy 2181145256Sjkoshy /* 2182145256Sjkoshy * If the target process record shows that no 2183145256Sjkoshy * PMCs are attached to it, reclaim its space. 2184145256Sjkoshy */ 2185145256Sjkoshy 2186145256Sjkoshy if (pp->pp_refcnt == 0) { 2187145256Sjkoshy pmc_remove_process_descriptor(pp); 2188145256Sjkoshy FREE(pp, M_PMC); 2189145256Sjkoshy } 2190145256Sjkoshy } 2191145256Sjkoshy 2192145256Sjkoshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 2193145256Sjkoshy 2194145256Sjkoshy } 2195145256Sjkoshy 2196145256Sjkoshy /* 2197145256Sjkoshy * Release any MD resources 2198145256Sjkoshy */ 2199145256Sjkoshy 2200145256Sjkoshy (void) md->pmd_release_pmc(cpu, ri, pm); 2201145256Sjkoshy 2202145256Sjkoshy /* 2203145256Sjkoshy * Update row disposition 2204145256Sjkoshy */ 2205145256Sjkoshy 2206145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 2207145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2208145256Sjkoshy else 2209145256Sjkoshy PMC_UNMARK_ROW_THREAD(ri); 2210145256Sjkoshy 2211145256Sjkoshy /* unlink from the owner's list */ 2212147191Sjkoshy if (pm->pm_owner) { 2213147191Sjkoshy LIST_REMOVE(pm, pm_next); 2214147191Sjkoshy pm->pm_owner = NULL; 2215147191Sjkoshy } 2216145256Sjkoshy 2217145256Sjkoshy pmc_destroy_pmc_descriptor(pm); 2218145256Sjkoshy} 2219145256Sjkoshy 2220145256Sjkoshy/* 2221145256Sjkoshy * Register an owner and a pmc. 2222145256Sjkoshy */ 2223145256Sjkoshy 2224145256Sjkoshystatic int 2225145256Sjkoshypmc_register_owner(struct proc *p, struct pmc *pmc) 2226145256Sjkoshy{ 2227145256Sjkoshy struct pmc_owner *po; 2228145256Sjkoshy 2229145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2230145256Sjkoshy 2231145774Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2232147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 2233145256Sjkoshy return ENOMEM; 2234145256Sjkoshy 2235145256Sjkoshy KASSERT(pmc->pm_owner == NULL, 2236145256Sjkoshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 2237145256Sjkoshy pmc->pm_owner = po; 2238145256Sjkoshy 2239147191Sjkoshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 2240145256Sjkoshy 2241145256Sjkoshy PROC_LOCK(p); 2242145256Sjkoshy p->p_flag |= P_HWPMC; 2243145256Sjkoshy PROC_UNLOCK(p); 2244145256Sjkoshy 2245147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 2246147191Sjkoshy pmclog_process_pmcallocate(pmc); 2247145256Sjkoshy 2248147191Sjkoshy PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2249147191Sjkoshy po, pmc); 2250147191Sjkoshy 2251145256Sjkoshy return 0; 2252145256Sjkoshy} 2253145256Sjkoshy 2254145256Sjkoshy/* 2255145256Sjkoshy * Return the current row disposition: 2256145256Sjkoshy * == 0 => FREE 2257145256Sjkoshy * > 0 => PROCESS MODE 2258145256Sjkoshy * < 0 => SYSTEM MODE 2259145256Sjkoshy */ 2260145256Sjkoshy 2261145256Sjkoshyint 2262145256Sjkoshypmc_getrowdisp(int ri) 2263145256Sjkoshy{ 2264145256Sjkoshy return pmc_pmcdisp[ri]; 2265145256Sjkoshy} 2266145256Sjkoshy 2267145256Sjkoshy/* 2268145256Sjkoshy * Check if a PMC at row index 'ri' can be allocated to the current 2269145256Sjkoshy * process. 2270145256Sjkoshy * 2271145256Sjkoshy * Allocation can fail if: 2272145256Sjkoshy * - the current process is already being profiled by a PMC at index 'ri', 2273145256Sjkoshy * attached to it via OP_PMCATTACH. 2274145256Sjkoshy * - the current process has already allocated a PMC at index 'ri' 2275145256Sjkoshy * via OP_ALLOCATE. 2276145256Sjkoshy */ 2277145256Sjkoshy 2278145256Sjkoshystatic int 2279145774Sjkoshypmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2280145256Sjkoshy{ 2281145774Sjkoshy enum pmc_mode mode; 2282145774Sjkoshy struct pmc *pm; 2283145256Sjkoshy struct pmc_owner *po; 2284145256Sjkoshy struct pmc_process *pp; 2285145256Sjkoshy 2286145774Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2287145774Sjkoshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2288145256Sjkoshy 2289145774Sjkoshy /* 2290145774Sjkoshy * We shouldn't have already allocated a process-mode PMC at 2291145774Sjkoshy * row index 'ri'. 2292145774Sjkoshy * 2293145774Sjkoshy * We shouldn't have allocated a system-wide PMC on the same 2294145774Sjkoshy * CPU and same RI. 2295145774Sjkoshy */ 2296145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2297147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2298145774Sjkoshy if (PMC_TO_ROWINDEX(pm) == ri) { 2299145774Sjkoshy mode = PMC_TO_MODE(pm); 2300145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) 2301145774Sjkoshy return EEXIST; 2302145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && 2303145774Sjkoshy (int) PMC_TO_CPU(pm) == cpu) 2304145774Sjkoshy return EEXIST; 2305145774Sjkoshy } 2306145774Sjkoshy } 2307145256Sjkoshy 2308145774Sjkoshy /* 2309145774Sjkoshy * We also shouldn't be the target of any PMC at this index 2310145774Sjkoshy * since otherwise a PMC_ATTACH to ourselves will fail. 2311145774Sjkoshy */ 2312145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2313145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc) 2314145256Sjkoshy return EEXIST; 2315145256Sjkoshy 2316145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2317145256Sjkoshy p, p->p_pid, p->p_comm, ri); 2318145256Sjkoshy 2319145256Sjkoshy return 0; 2320145256Sjkoshy} 2321145256Sjkoshy 2322145256Sjkoshy/* 2323145256Sjkoshy * Check if a given PMC at row index 'ri' can be currently used in 2324145256Sjkoshy * mode 'mode'. 2325145256Sjkoshy */ 2326145256Sjkoshy 2327145256Sjkoshystatic int 2328145256Sjkoshypmc_can_allocate_row(int ri, enum pmc_mode mode) 2329145256Sjkoshy{ 2330145256Sjkoshy enum pmc_disp disp; 2331145256Sjkoshy 2332145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2333145256Sjkoshy 2334145256Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2335145256Sjkoshy 2336145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2337145256Sjkoshy disp = PMC_DISP_STANDALONE; 2338145256Sjkoshy else 2339145256Sjkoshy disp = PMC_DISP_THREAD; 2340145256Sjkoshy 2341145256Sjkoshy /* 2342145256Sjkoshy * check disposition for PMC row 'ri': 2343145256Sjkoshy * 2344145256Sjkoshy * Expected disposition Row-disposition Result 2345145256Sjkoshy * 2346145256Sjkoshy * STANDALONE STANDALONE or FREE proceed 2347145256Sjkoshy * STANDALONE THREAD fail 2348145256Sjkoshy * THREAD THREAD or FREE proceed 2349145256Sjkoshy * THREAD STANDALONE fail 2350145256Sjkoshy */ 2351145256Sjkoshy 2352145256Sjkoshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2353145256Sjkoshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2354145256Sjkoshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2355145256Sjkoshy return EBUSY; 2356145256Sjkoshy 2357145256Sjkoshy /* 2358145256Sjkoshy * All OK 2359145256Sjkoshy */ 2360145256Sjkoshy 2361145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2362145256Sjkoshy 2363145256Sjkoshy return 0; 2364145256Sjkoshy 2365145256Sjkoshy} 2366145256Sjkoshy 2367145256Sjkoshy/* 2368145774Sjkoshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2369145256Sjkoshy */ 2370145256Sjkoshy 2371145256Sjkoshystatic struct pmc * 2372145256Sjkoshypmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2373145256Sjkoshy{ 2374147191Sjkoshy struct pmc *pm; 2375145256Sjkoshy 2376145774Sjkoshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2377145774Sjkoshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2378145774Sjkoshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2379145256Sjkoshy 2380147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2381147191Sjkoshy if (pm->pm_id == pmcid) 2382147191Sjkoshy return pm; 2383145256Sjkoshy 2384145256Sjkoshy return NULL; 2385145256Sjkoshy} 2386145256Sjkoshy 2387145256Sjkoshystatic int 2388145256Sjkoshypmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2389145256Sjkoshy{ 2390145256Sjkoshy 2391145256Sjkoshy struct pmc *pm; 2392145256Sjkoshy struct pmc_owner *po; 2393145256Sjkoshy 2394145256Sjkoshy PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid); 2395145256Sjkoshy 2396145256Sjkoshy if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) 2397145256Sjkoshy return ESRCH; 2398145256Sjkoshy 2399145256Sjkoshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2400145256Sjkoshy return EINVAL; 2401145256Sjkoshy 2402145256Sjkoshy PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2403145256Sjkoshy 2404145256Sjkoshy *pmc = pm; 2405145256Sjkoshy return 0; 2406145256Sjkoshy} 2407145256Sjkoshy 2408145256Sjkoshy/* 2409145256Sjkoshy * Start a PMC. 2410145256Sjkoshy */ 2411145256Sjkoshy 2412145256Sjkoshystatic int 2413145256Sjkoshypmc_start(struct pmc *pm) 2414145256Sjkoshy{ 2415145256Sjkoshy int error, cpu, ri; 2416145774Sjkoshy enum pmc_mode mode; 2417147191Sjkoshy struct pmc_owner *po; 2418145256Sjkoshy struct pmc_binding pb; 2419145256Sjkoshy 2420145256Sjkoshy KASSERT(pm != NULL, 2421145256Sjkoshy ("[pmc,%d] null pm", __LINE__)); 2422145256Sjkoshy 2423145774Sjkoshy mode = PMC_TO_MODE(pm); 2424145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2425145774Sjkoshy error = 0; 2426145256Sjkoshy 2427145774Sjkoshy PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2428145774Sjkoshy 2429147191Sjkoshy po = pm->pm_owner; 2430145256Sjkoshy 2431174395Sjkoshy /* 2432174395Sjkoshy * Disallow PMCSTART if a logfile is required but has not been 2433174395Sjkoshy * configured yet. 2434174395Sjkoshy */ 2435174395Sjkoshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2436174395Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2437174395Sjkoshy return EDOOFUS; /* programming error */ 2438174395Sjkoshy 2439174395Sjkoshy /* 2440174395Sjkoshy * If this is a sampling mode PMC, log mapping information for 2441174395Sjkoshy * the kernel modules that are currently loaded. 2442174395Sjkoshy */ 2443174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2444174395Sjkoshy pmc_log_kernel_mappings(pm); 2445174395Sjkoshy 2446145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2447145256Sjkoshy 2448145256Sjkoshy /* 2449147191Sjkoshy * If a PMCATTACH has never been done on this PMC, 2450147191Sjkoshy * attach it to its owner process. 2451145256Sjkoshy */ 2452145256Sjkoshy 2453145256Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 2454147191Sjkoshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2455147191Sjkoshy pmc_attach_process(po->po_owner, pm); 2456145256Sjkoshy 2457145774Sjkoshy /* 2458147191Sjkoshy * If the PMC is attached to its owner, then force a context 2459147191Sjkoshy * switch to ensure that the MD state gets set correctly. 2460145256Sjkoshy */ 2461145256Sjkoshy 2462147191Sjkoshy if (error == 0) { 2463147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2464147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2465147191Sjkoshy pmc_force_context_switch(); 2466147191Sjkoshy } 2467147191Sjkoshy 2468145774Sjkoshy return error; 2469147191Sjkoshy } 2470145256Sjkoshy 2471147191Sjkoshy 2472147191Sjkoshy /* 2473147191Sjkoshy * A system-wide PMC. 2474174395Sjkoshy * 2475147191Sjkoshy * Add the owner to the global list if this is a system-wide 2476147191Sjkoshy * sampling PMC. 2477147191Sjkoshy */ 2478147191Sjkoshy 2479147191Sjkoshy if (mode == PMC_MODE_SS) { 2480147191Sjkoshy if (po->po_sscount == 0) { 2481147191Sjkoshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2482147191Sjkoshy atomic_add_rel_int(&pmc_ss_count, 1); 2483147191Sjkoshy PMCDBG(PMC,OPS,1, "po=%p in global list", po); 2484147191Sjkoshy } 2485147191Sjkoshy po->po_sscount++; 2486145256Sjkoshy } 2487145256Sjkoshy 2488174395Sjkoshy /* Log mapping information for all processes in the system. */ 2489174395Sjkoshy pmc_log_all_process_mappings(po); 2490157144Sjkoshy 2491145256Sjkoshy /* 2492147191Sjkoshy * Move to the CPU associated with this 2493145256Sjkoshy * PMC, and start the hardware. 2494145256Sjkoshy */ 2495145256Sjkoshy 2496145256Sjkoshy pmc_save_cpu_binding(&pb); 2497145256Sjkoshy 2498145774Sjkoshy cpu = PMC_TO_CPU(pm); 2499145256Sjkoshy 2500145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 2501145256Sjkoshy return ENXIO; 2502145256Sjkoshy 2503145256Sjkoshy pmc_select_cpu(cpu); 2504145256Sjkoshy 2505145256Sjkoshy /* 2506145256Sjkoshy * global PMCs are configured at allocation time 2507145256Sjkoshy * so write out the initial value and start the PMC. 2508145256Sjkoshy */ 2509145256Sjkoshy 2510147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2511147191Sjkoshy 2512145774Sjkoshy critical_enter(); 2513145256Sjkoshy if ((error = md->pmd_write_pmc(cpu, ri, 2514145774Sjkoshy PMC_IS_SAMPLING_MODE(mode) ? 2515145256Sjkoshy pm->pm_sc.pm_reloadcount : 2516145256Sjkoshy pm->pm_sc.pm_initial)) == 0) 2517145256Sjkoshy error = md->pmd_start_pmc(cpu, ri); 2518145774Sjkoshy critical_exit(); 2519145256Sjkoshy 2520145256Sjkoshy pmc_restore_cpu_binding(&pb); 2521145256Sjkoshy 2522145256Sjkoshy return error; 2523145256Sjkoshy} 2524145256Sjkoshy 2525145256Sjkoshy/* 2526145256Sjkoshy * Stop a PMC. 2527145256Sjkoshy */ 2528145256Sjkoshy 2529145256Sjkoshystatic int 2530145256Sjkoshypmc_stop(struct pmc *pm) 2531145256Sjkoshy{ 2532145774Sjkoshy int cpu, error, ri; 2533147191Sjkoshy struct pmc_owner *po; 2534145256Sjkoshy struct pmc_binding pb; 2535145256Sjkoshy 2536145256Sjkoshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2537145256Sjkoshy 2538145774Sjkoshy PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2539145774Sjkoshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2540145256Sjkoshy 2541145256Sjkoshy pm->pm_state = PMC_STATE_STOPPED; 2542145256Sjkoshy 2543145256Sjkoshy /* 2544145256Sjkoshy * If the PMC is a virtual mode one, changing the state to 2545145256Sjkoshy * non-RUNNING is enough to ensure that the PMC never gets 2546145256Sjkoshy * scheduled. 2547145256Sjkoshy * 2548145256Sjkoshy * If this PMC is current running on a CPU, then it will 2549145256Sjkoshy * handled correctly at the time its target process is context 2550145256Sjkoshy * switched out. 2551145256Sjkoshy */ 2552145256Sjkoshy 2553145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2554145256Sjkoshy return 0; 2555145256Sjkoshy 2556145256Sjkoshy /* 2557145256Sjkoshy * A system-mode PMC. Move to the CPU associated with 2558145256Sjkoshy * this PMC, and stop the hardware. We update the 2559145256Sjkoshy * 'initial count' so that a subsequent PMCSTART will 2560145256Sjkoshy * resume counting from the current hardware count. 2561145256Sjkoshy */ 2562145256Sjkoshy 2563145256Sjkoshy pmc_save_cpu_binding(&pb); 2564145256Sjkoshy 2565145774Sjkoshy cpu = PMC_TO_CPU(pm); 2566145256Sjkoshy 2567145774Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 2568145774Sjkoshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2569145774Sjkoshy 2570145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 2571145256Sjkoshy return ENXIO; 2572145256Sjkoshy 2573145256Sjkoshy pmc_select_cpu(cpu); 2574145256Sjkoshy 2575145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2576145256Sjkoshy 2577145774Sjkoshy critical_enter(); 2578145774Sjkoshy if ((error = md->pmd_stop_pmc(cpu, ri)) == 0) 2579145774Sjkoshy error = md->pmd_read_pmc(cpu, ri, &pm->pm_sc.pm_initial); 2580145774Sjkoshy critical_exit(); 2581145774Sjkoshy 2582145256Sjkoshy pmc_restore_cpu_binding(&pb); 2583145256Sjkoshy 2584147191Sjkoshy po = pm->pm_owner; 2585147191Sjkoshy 2586147191Sjkoshy /* remove this owner from the global list of SS PMC owners */ 2587147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2588147191Sjkoshy po->po_sscount--; 2589147191Sjkoshy if (po->po_sscount == 0) { 2590147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2591147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2592147191Sjkoshy PMCDBG(PMC,OPS,2,"po=%p removed from global list", po); 2593147191Sjkoshy } 2594147191Sjkoshy } 2595147191Sjkoshy 2596145256Sjkoshy return error; 2597145256Sjkoshy} 2598145256Sjkoshy 2599145256Sjkoshy 2600153110Sru#ifdef DEBUG 2601145256Sjkoshystatic const char *pmc_op_to_name[] = { 2602145256Sjkoshy#undef __PMC_OP 2603145256Sjkoshy#define __PMC_OP(N, D) #N , 2604145256Sjkoshy __PMC_OPS() 2605145256Sjkoshy NULL 2606145256Sjkoshy}; 2607145256Sjkoshy#endif 2608145256Sjkoshy 2609145256Sjkoshy/* 2610145256Sjkoshy * The syscall interface 2611145256Sjkoshy */ 2612145256Sjkoshy 2613145256Sjkoshy#define PMC_GET_SX_XLOCK(...) do { \ 2614145256Sjkoshy sx_xlock(&pmc_sx); \ 2615145256Sjkoshy if (pmc_hook == NULL) { \ 2616145256Sjkoshy sx_xunlock(&pmc_sx); \ 2617145256Sjkoshy return __VA_ARGS__; \ 2618145256Sjkoshy } \ 2619145256Sjkoshy} while (0) 2620145256Sjkoshy 2621145256Sjkoshy#define PMC_DOWNGRADE_SX() do { \ 2622145256Sjkoshy sx_downgrade(&pmc_sx); \ 2623145256Sjkoshy is_sx_downgraded = 1; \ 2624145256Sjkoshy} while (0) 2625145256Sjkoshy 2626145256Sjkoshystatic int 2627145256Sjkoshypmc_syscall_handler(struct thread *td, void *syscall_args) 2628145256Sjkoshy{ 2629145256Sjkoshy int error, is_sx_downgraded, op; 2630145256Sjkoshy struct pmc_syscall_args *c; 2631145256Sjkoshy void *arg; 2632145256Sjkoshy 2633145256Sjkoshy PMC_GET_SX_XLOCK(ENOSYS); 2634145256Sjkoshy 2635147191Sjkoshy DROP_GIANT(); 2636147191Sjkoshy 2637145256Sjkoshy is_sx_downgraded = 0; 2638145256Sjkoshy 2639145256Sjkoshy c = (struct pmc_syscall_args *) syscall_args; 2640145256Sjkoshy 2641145256Sjkoshy op = c->pmop_code; 2642145256Sjkoshy arg = c->pmop_data; 2643145256Sjkoshy 2644145256Sjkoshy PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2645145256Sjkoshy pmc_op_to_name[op], arg); 2646145256Sjkoshy 2647145256Sjkoshy error = 0; 2648145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2649145256Sjkoshy 2650145256Sjkoshy switch(op) 2651145256Sjkoshy { 2652145256Sjkoshy 2653145256Sjkoshy 2654145256Sjkoshy /* 2655145256Sjkoshy * Configure a log file. 2656145256Sjkoshy * 2657145256Sjkoshy * XXX This OP will be reworked. 2658145256Sjkoshy */ 2659145256Sjkoshy 2660145256Sjkoshy case PMC_OP_CONFIGURELOG: 2661145256Sjkoshy { 2662157144Sjkoshy struct proc *p; 2663156466Sjkoshy struct pmc *pm; 2664145256Sjkoshy struct pmc_owner *po; 2665145256Sjkoshy struct pmc_op_configurelog cl; 2666145256Sjkoshy 2667145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2668145256Sjkoshy 2669145256Sjkoshy if ((error = copyin(arg, &cl, sizeof(cl))) != 0) 2670145256Sjkoshy break; 2671145256Sjkoshy 2672145256Sjkoshy /* mark this process as owning a log file */ 2673145256Sjkoshy p = td->td_proc; 2674145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2675147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2676147191Sjkoshy error = ENOMEM; 2677147191Sjkoshy break; 2678147191Sjkoshy } 2679145256Sjkoshy 2680147191Sjkoshy /* 2681147191Sjkoshy * If a valid fd was passed in, try to configure that, 2682147191Sjkoshy * otherwise if 'fd' was less than zero and there was 2683147191Sjkoshy * a log file configured, flush its buffers and 2684147191Sjkoshy * de-configure it. 2685147191Sjkoshy */ 2686147191Sjkoshy if (cl.pm_logfd >= 0) 2687147191Sjkoshy error = pmclog_configure_log(po, cl.pm_logfd); 2688147191Sjkoshy else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2689147191Sjkoshy pmclog_process_closelog(po); 2690147191Sjkoshy error = pmclog_flush(po); 2691156466Sjkoshy if (error == 0) { 2692156466Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2693156834Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 2694156834Sjkoshy pm->pm_state == PMC_STATE_RUNNING) 2695156466Sjkoshy pmc_stop(pm); 2696147191Sjkoshy error = pmclog_deconfigure_log(po); 2697156466Sjkoshy } 2698147191Sjkoshy } else 2699147191Sjkoshy error = EINVAL; 2700157144Sjkoshy 2701157144Sjkoshy if (error) 2702157144Sjkoshy break; 2703147191Sjkoshy } 2704147191Sjkoshy break; 2705147191Sjkoshy 2706147191Sjkoshy 2707147191Sjkoshy /* 2708147191Sjkoshy * Flush a log file. 2709147191Sjkoshy */ 2710147191Sjkoshy 2711147191Sjkoshy case PMC_OP_FLUSHLOG: 2712147191Sjkoshy { 2713147191Sjkoshy struct pmc_owner *po; 2714147191Sjkoshy 2715147191Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2716147191Sjkoshy 2717147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2718147191Sjkoshy error = EINVAL; 2719145256Sjkoshy break; 2720147191Sjkoshy } 2721145256Sjkoshy 2722147191Sjkoshy error = pmclog_flush(po); 2723145256Sjkoshy } 2724145256Sjkoshy break; 2725145256Sjkoshy 2726145256Sjkoshy /* 2727145256Sjkoshy * Retrieve hardware configuration. 2728145256Sjkoshy */ 2729145256Sjkoshy 2730145256Sjkoshy case PMC_OP_GETCPUINFO: /* CPU information */ 2731145256Sjkoshy { 2732145256Sjkoshy struct pmc_op_getcpuinfo gci; 2733145256Sjkoshy 2734145256Sjkoshy gci.pm_cputype = md->pmd_cputype; 2735145774Sjkoshy gci.pm_ncpu = mp_ncpus; 2736145256Sjkoshy gci.pm_npmc = md->pmd_npmc; 2737145256Sjkoshy gci.pm_nclass = md->pmd_nclass; 2738145256Sjkoshy bcopy(md->pmd_classes, &gci.pm_classes, 2739145256Sjkoshy sizeof(gci.pm_classes)); 2740145256Sjkoshy error = copyout(&gci, arg, sizeof(gci)); 2741145256Sjkoshy } 2742145256Sjkoshy break; 2743145256Sjkoshy 2744145256Sjkoshy 2745145256Sjkoshy /* 2746145256Sjkoshy * Get module statistics 2747145256Sjkoshy */ 2748145256Sjkoshy 2749145256Sjkoshy case PMC_OP_GETDRIVERSTATS: 2750145256Sjkoshy { 2751145256Sjkoshy struct pmc_op_getdriverstats gms; 2752145256Sjkoshy 2753145256Sjkoshy bcopy(&pmc_stats, &gms, sizeof(gms)); 2754145256Sjkoshy error = copyout(&gms, arg, sizeof(gms)); 2755145256Sjkoshy } 2756145256Sjkoshy break; 2757145256Sjkoshy 2758145256Sjkoshy 2759145256Sjkoshy /* 2760145256Sjkoshy * Retrieve module version number 2761145256Sjkoshy */ 2762145256Sjkoshy 2763145256Sjkoshy case PMC_OP_GETMODULEVERSION: 2764145256Sjkoshy { 2765147191Sjkoshy uint32_t cv, modv; 2766147191Sjkoshy 2767147191Sjkoshy /* retrieve the client's idea of the ABI version */ 2768147191Sjkoshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 2769147191Sjkoshy break; 2770147191Sjkoshy /* don't service clients newer than our driver */ 2771147191Sjkoshy modv = PMC_VERSION; 2772147191Sjkoshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 2773147191Sjkoshy error = EPROGMISMATCH; 2774147191Sjkoshy break; 2775147191Sjkoshy } 2776147191Sjkoshy error = copyout(&modv, arg, sizeof(int)); 2777145256Sjkoshy } 2778145256Sjkoshy break; 2779145256Sjkoshy 2780145256Sjkoshy 2781145256Sjkoshy /* 2782145256Sjkoshy * Retrieve the state of all the PMCs on a given 2783145256Sjkoshy * CPU. 2784145256Sjkoshy */ 2785145256Sjkoshy 2786145256Sjkoshy case PMC_OP_GETPMCINFO: 2787145256Sjkoshy { 2788145256Sjkoshy uint32_t cpu, n, npmc; 2789145256Sjkoshy size_t pmcinfo_size; 2790145256Sjkoshy struct pmc *pm; 2791145256Sjkoshy struct pmc_info *p, *pmcinfo; 2792145256Sjkoshy struct pmc_op_getpmcinfo *gpi; 2793145256Sjkoshy struct pmc_owner *po; 2794145256Sjkoshy struct pmc_binding pb; 2795145256Sjkoshy 2796145256Sjkoshy PMC_DOWNGRADE_SX(); 2797145256Sjkoshy 2798145256Sjkoshy gpi = (struct pmc_op_getpmcinfo *) arg; 2799145256Sjkoshy 2800145256Sjkoshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 2801145256Sjkoshy break; 2802145256Sjkoshy 2803145256Sjkoshy if (cpu >= (unsigned int) mp_ncpus) { 2804145256Sjkoshy error = EINVAL; 2805145256Sjkoshy break; 2806145256Sjkoshy } 2807145256Sjkoshy 2808145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 2809145256Sjkoshy error = ENXIO; 2810145256Sjkoshy break; 2811145256Sjkoshy } 2812145256Sjkoshy 2813145256Sjkoshy /* switch to CPU 'cpu' */ 2814145256Sjkoshy pmc_save_cpu_binding(&pb); 2815145256Sjkoshy pmc_select_cpu(cpu); 2816145256Sjkoshy 2817145256Sjkoshy npmc = md->pmd_npmc; 2818145256Sjkoshy 2819145256Sjkoshy pmcinfo_size = npmc * sizeof(struct pmc_info); 2820145256Sjkoshy MALLOC(pmcinfo, struct pmc_info *, pmcinfo_size, M_PMC, 2821145256Sjkoshy M_WAITOK); 2822145256Sjkoshy 2823145256Sjkoshy p = pmcinfo; 2824145256Sjkoshy 2825145256Sjkoshy for (n = 0; n < md->pmd_npmc; n++, p++) { 2826145256Sjkoshy 2827145256Sjkoshy if ((error = md->pmd_describe(cpu, n, p, &pm)) != 0) 2828145256Sjkoshy break; 2829145256Sjkoshy 2830145256Sjkoshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 2831145256Sjkoshy p->pm_rowdisp = PMC_DISP_STANDALONE; 2832145256Sjkoshy else if (PMC_ROW_DISP_IS_THREAD(n)) 2833145256Sjkoshy p->pm_rowdisp = PMC_DISP_THREAD; 2834145256Sjkoshy else 2835145256Sjkoshy p->pm_rowdisp = PMC_DISP_FREE; 2836145256Sjkoshy 2837145256Sjkoshy p->pm_ownerpid = -1; 2838145256Sjkoshy 2839145256Sjkoshy if (pm == NULL) /* no PMC associated */ 2840145256Sjkoshy continue; 2841145256Sjkoshy 2842145256Sjkoshy po = pm->pm_owner; 2843145256Sjkoshy 2844145256Sjkoshy KASSERT(po->po_owner != NULL, 2845145256Sjkoshy ("[pmc,%d] pmc_owner had a null proc pointer", 2846145256Sjkoshy __LINE__)); 2847145256Sjkoshy 2848145256Sjkoshy p->pm_ownerpid = po->po_owner->p_pid; 2849145774Sjkoshy p->pm_mode = PMC_TO_MODE(pm); 2850145256Sjkoshy p->pm_event = pm->pm_event; 2851145256Sjkoshy p->pm_flags = pm->pm_flags; 2852145256Sjkoshy 2853145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2854145256Sjkoshy p->pm_reloadcount = 2855145256Sjkoshy pm->pm_sc.pm_reloadcount; 2856145256Sjkoshy } 2857145256Sjkoshy 2858145256Sjkoshy pmc_restore_cpu_binding(&pb); 2859145256Sjkoshy 2860145256Sjkoshy /* now copy out the PMC info collected */ 2861145256Sjkoshy if (error == 0) 2862145256Sjkoshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 2863145256Sjkoshy 2864145256Sjkoshy FREE(pmcinfo, M_PMC); 2865145256Sjkoshy } 2866145256Sjkoshy break; 2867145256Sjkoshy 2868145256Sjkoshy 2869145256Sjkoshy /* 2870145256Sjkoshy * Set the administrative state of a PMC. I.e. whether 2871145256Sjkoshy * the PMC is to be used or not. 2872145256Sjkoshy */ 2873145256Sjkoshy 2874145256Sjkoshy case PMC_OP_PMCADMIN: 2875145256Sjkoshy { 2876145256Sjkoshy int cpu, ri; 2877145256Sjkoshy enum pmc_state request; 2878145256Sjkoshy struct pmc_cpu *pc; 2879145256Sjkoshy struct pmc_hw *phw; 2880145256Sjkoshy struct pmc_op_pmcadmin pma; 2881145256Sjkoshy struct pmc_binding pb; 2882145256Sjkoshy 2883145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2884145256Sjkoshy 2885145256Sjkoshy KASSERT(td == curthread, 2886145256Sjkoshy ("[pmc,%d] td != curthread", __LINE__)); 2887145256Sjkoshy 2888164033Srwatson error = priv_check(td, PRIV_PMC_MANAGE); 2889164033Srwatson if (error) 2890145256Sjkoshy break; 2891145256Sjkoshy 2892145256Sjkoshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 2893145256Sjkoshy break; 2894145256Sjkoshy 2895145256Sjkoshy cpu = pma.pm_cpu; 2896145256Sjkoshy 2897145256Sjkoshy if (cpu < 0 || cpu >= mp_ncpus) { 2898145256Sjkoshy error = EINVAL; 2899145256Sjkoshy break; 2900145256Sjkoshy } 2901145256Sjkoshy 2902145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 2903145256Sjkoshy error = ENXIO; 2904145256Sjkoshy break; 2905145256Sjkoshy } 2906145256Sjkoshy 2907145256Sjkoshy request = pma.pm_state; 2908145256Sjkoshy 2909145256Sjkoshy if (request != PMC_STATE_DISABLED && 2910145256Sjkoshy request != PMC_STATE_FREE) { 2911145256Sjkoshy error = EINVAL; 2912145256Sjkoshy break; 2913145256Sjkoshy } 2914145256Sjkoshy 2915145256Sjkoshy ri = pma.pm_pmc; /* pmc id == row index */ 2916145256Sjkoshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 2917145256Sjkoshy error = EINVAL; 2918145256Sjkoshy break; 2919145256Sjkoshy } 2920145256Sjkoshy 2921145256Sjkoshy /* 2922145256Sjkoshy * We can't disable a PMC with a row-index allocated 2923145256Sjkoshy * for process virtual PMCs. 2924145256Sjkoshy */ 2925145256Sjkoshy 2926145256Sjkoshy if (PMC_ROW_DISP_IS_THREAD(ri) && 2927145256Sjkoshy request == PMC_STATE_DISABLED) { 2928145256Sjkoshy error = EBUSY; 2929145256Sjkoshy break; 2930145256Sjkoshy } 2931145256Sjkoshy 2932145256Sjkoshy /* 2933145256Sjkoshy * otherwise, this PMC on this CPU is either free or 2934145256Sjkoshy * in system-wide mode. 2935145256Sjkoshy */ 2936145256Sjkoshy 2937145256Sjkoshy pmc_save_cpu_binding(&pb); 2938145256Sjkoshy pmc_select_cpu(cpu); 2939145256Sjkoshy 2940145256Sjkoshy pc = pmc_pcpu[cpu]; 2941145256Sjkoshy phw = pc->pc_hwpmcs[ri]; 2942145256Sjkoshy 2943145256Sjkoshy /* 2944145256Sjkoshy * XXX do we need some kind of 'forced' disable? 2945145256Sjkoshy */ 2946145256Sjkoshy 2947145256Sjkoshy if (phw->phw_pmc == NULL) { 2948145256Sjkoshy if (request == PMC_STATE_DISABLED && 2949145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 2950145256Sjkoshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 2951145256Sjkoshy PMC_MARK_ROW_STANDALONE(ri); 2952145256Sjkoshy } else if (request == PMC_STATE_FREE && 2953145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 2954145256Sjkoshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 2955145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2956145256Sjkoshy } 2957145256Sjkoshy /* other cases are a no-op */ 2958145256Sjkoshy } else 2959145256Sjkoshy error = EBUSY; 2960145256Sjkoshy 2961145256Sjkoshy pmc_restore_cpu_binding(&pb); 2962145256Sjkoshy } 2963145256Sjkoshy break; 2964145256Sjkoshy 2965145256Sjkoshy 2966145256Sjkoshy /* 2967145256Sjkoshy * Allocate a PMC. 2968145256Sjkoshy */ 2969145256Sjkoshy 2970145256Sjkoshy case PMC_OP_PMCALLOCATE: 2971145256Sjkoshy { 2972145256Sjkoshy uint32_t caps; 2973145256Sjkoshy u_int cpu; 2974145256Sjkoshy int n; 2975145256Sjkoshy enum pmc_mode mode; 2976145256Sjkoshy struct pmc *pmc; 2977145774Sjkoshy struct pmc_hw *phw; 2978145256Sjkoshy struct pmc_op_pmcallocate pa; 2979145256Sjkoshy struct pmc_binding pb; 2980145256Sjkoshy 2981145256Sjkoshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 2982145256Sjkoshy break; 2983145256Sjkoshy 2984145256Sjkoshy caps = pa.pm_caps; 2985145256Sjkoshy mode = pa.pm_mode; 2986145256Sjkoshy cpu = pa.pm_cpu; 2987145256Sjkoshy 2988145256Sjkoshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 2989145256Sjkoshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 2990145256Sjkoshy (cpu != (u_int) PMC_CPU_ANY && cpu >= (u_int) mp_ncpus)) { 2991145256Sjkoshy error = EINVAL; 2992145256Sjkoshy break; 2993145256Sjkoshy } 2994145256Sjkoshy 2995145256Sjkoshy /* 2996145256Sjkoshy * Virtual PMCs should only ask for a default CPU. 2997145256Sjkoshy * System mode PMCs need to specify a non-default CPU. 2998145256Sjkoshy */ 2999145256Sjkoshy 3000145256Sjkoshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 3001145256Sjkoshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 3002145256Sjkoshy error = EINVAL; 3003145256Sjkoshy break; 3004145256Sjkoshy } 3005145256Sjkoshy 3006145256Sjkoshy /* 3007145256Sjkoshy * Check that a disabled CPU is not being asked for. 3008145256Sjkoshy */ 3009145256Sjkoshy 3010145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && pmc_cpu_is_disabled(cpu)) { 3011145256Sjkoshy error = ENXIO; 3012145256Sjkoshy break; 3013145256Sjkoshy } 3014145256Sjkoshy 3015145256Sjkoshy /* 3016145256Sjkoshy * Refuse an allocation for a system-wide PMC if this 3017145256Sjkoshy * process has been jailed, or if this process lacks 3018145256Sjkoshy * super-user credentials and the sysctl tunable 3019145256Sjkoshy * 'security.bsd.unprivileged_syspmcs' is zero. 3020145256Sjkoshy */ 3021145256Sjkoshy 3022145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3023164033Srwatson if (jailed(curthread->td_ucred)) { 3024145256Sjkoshy error = EPERM; 3025164033Srwatson break; 3026164033Srwatson } 3027164033Srwatson if (!pmc_unprivileged_syspmcs) { 3028164033Srwatson error = priv_check(curthread, 3029164033Srwatson PRIV_PMC_SYSTEM); 3030164033Srwatson if (error) 3031164033Srwatson break; 3032164033Srwatson } 3033145256Sjkoshy } 3034145256Sjkoshy 3035145256Sjkoshy if (error) 3036145256Sjkoshy break; 3037145256Sjkoshy 3038145256Sjkoshy /* 3039145256Sjkoshy * Look for valid values for 'pm_flags' 3040145256Sjkoshy */ 3041145256Sjkoshy 3042147191Sjkoshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 3043174395Sjkoshy PMC_F_LOG_PROCEXIT | PMC_F_CALLCHAIN)) != 0) { 3044145256Sjkoshy error = EINVAL; 3045145256Sjkoshy break; 3046145256Sjkoshy } 3047145256Sjkoshy 3048147191Sjkoshy /* process logging options are not allowed for system PMCs */ 3049147191Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 3050147191Sjkoshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 3051147191Sjkoshy error = EINVAL; 3052147191Sjkoshy break; 3053147191Sjkoshy } 3054147191Sjkoshy 3055145256Sjkoshy /* 3056145256Sjkoshy * All sampling mode PMCs need to be able to interrupt the 3057145256Sjkoshy * CPU. 3058145256Sjkoshy */ 3059147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode)) 3060145256Sjkoshy caps |= PMC_CAP_INTERRUPT; 3061145256Sjkoshy 3062149374Sjkoshy /* A valid class specifier should have been passed in. */ 3063149374Sjkoshy for (n = 0; n < md->pmd_nclass; n++) 3064149374Sjkoshy if (md->pmd_classes[n].pm_class == pa.pm_class) 3065149374Sjkoshy break; 3066149374Sjkoshy if (n == md->pmd_nclass) { 3067149374Sjkoshy error = EINVAL; 3068149374Sjkoshy break; 3069149374Sjkoshy } 3070149374Sjkoshy 3071149374Sjkoshy /* The requested PMC capabilities should be feasible. */ 3072149374Sjkoshy if ((md->pmd_classes[n].pm_caps & caps) != caps) { 3073149374Sjkoshy error = EOPNOTSUPP; 3074149374Sjkoshy break; 3075149374Sjkoshy } 3076149374Sjkoshy 3077145256Sjkoshy PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 3078145256Sjkoshy pa.pm_ev, caps, mode, cpu); 3079145256Sjkoshy 3080145256Sjkoshy pmc = pmc_allocate_pmc_descriptor(); 3081145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 3082145774Sjkoshy PMC_ID_INVALID); 3083145256Sjkoshy pmc->pm_event = pa.pm_ev; 3084145256Sjkoshy pmc->pm_state = PMC_STATE_FREE; 3085145256Sjkoshy pmc->pm_caps = caps; 3086145256Sjkoshy pmc->pm_flags = pa.pm_flags; 3087145256Sjkoshy 3088145256Sjkoshy /* switch thread to CPU 'cpu' */ 3089145256Sjkoshy pmc_save_cpu_binding(&pb); 3090145256Sjkoshy 3091145256Sjkoshy#define PMC_IS_SHAREABLE_PMC(cpu, n) \ 3092145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 3093145256Sjkoshy PMC_PHW_FLAG_IS_SHAREABLE) 3094145256Sjkoshy#define PMC_IS_UNALLOCATED(cpu, n) \ 3095145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 3096145256Sjkoshy 3097145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3098145256Sjkoshy pmc_select_cpu(cpu); 3099145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 3100145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3101145256Sjkoshy pmc_can_allocate_rowindex( 3102145774Sjkoshy curthread->td_proc, n, cpu) == 0 && 3103145256Sjkoshy (PMC_IS_UNALLOCATED(cpu, n) || 3104145256Sjkoshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 3105145256Sjkoshy md->pmd_allocate_pmc(cpu, n, pmc, 3106145256Sjkoshy &pa) == 0) 3107145256Sjkoshy break; 3108145256Sjkoshy } else { 3109145256Sjkoshy /* Process virtual mode */ 3110145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3111145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3112145256Sjkoshy pmc_can_allocate_rowindex( 3113145774Sjkoshy curthread->td_proc, n, 3114145774Sjkoshy PMC_CPU_ANY) == 0 && 3115145256Sjkoshy md->pmd_allocate_pmc(curthread->td_oncpu, 3116145256Sjkoshy n, pmc, &pa) == 0) 3117145256Sjkoshy break; 3118145256Sjkoshy } 3119145256Sjkoshy } 3120145256Sjkoshy 3121145256Sjkoshy#undef PMC_IS_UNALLOCATED 3122145256Sjkoshy#undef PMC_IS_SHAREABLE_PMC 3123145256Sjkoshy 3124145256Sjkoshy pmc_restore_cpu_binding(&pb); 3125145256Sjkoshy 3126145256Sjkoshy if (n == (int) md->pmd_npmc) { 3127145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3128145256Sjkoshy FREE(pmc, M_PMC); 3129145256Sjkoshy pmc = NULL; 3130145256Sjkoshy error = EINVAL; 3131145256Sjkoshy break; 3132145256Sjkoshy } 3133145256Sjkoshy 3134145774Sjkoshy /* Fill in the correct value in the ID field */ 3135145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 3136145256Sjkoshy 3137145774Sjkoshy PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 3138145774Sjkoshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 3139145774Sjkoshy 3140147191Sjkoshy /* Process mode PMCs with logging enabled need log files */ 3141147191Sjkoshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 3142147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3143147191Sjkoshy 3144147191Sjkoshy /* All system mode sampling PMCs require a log file */ 3145147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 3146147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3147147191Sjkoshy 3148145256Sjkoshy /* 3149145256Sjkoshy * Configure global pmc's immediately 3150145256Sjkoshy */ 3151145256Sjkoshy 3152145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 3153145774Sjkoshy 3154145774Sjkoshy pmc_save_cpu_binding(&pb); 3155145774Sjkoshy pmc_select_cpu(cpu); 3156145774Sjkoshy 3157145774Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 3158145774Sjkoshy 3159145774Sjkoshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 3160145774Sjkoshy (error = md->pmd_config_pmc(cpu, n, pmc)) != 0) { 3161145256Sjkoshy (void) md->pmd_release_pmc(cpu, n, pmc); 3162145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3163145256Sjkoshy FREE(pmc, M_PMC); 3164145256Sjkoshy pmc = NULL; 3165145774Sjkoshy pmc_restore_cpu_binding(&pb); 3166145774Sjkoshy error = EPERM; 3167145256Sjkoshy break; 3168145256Sjkoshy } 3169145256Sjkoshy 3170145774Sjkoshy pmc_restore_cpu_binding(&pb); 3171145774Sjkoshy } 3172145256Sjkoshy 3173145256Sjkoshy pmc->pm_state = PMC_STATE_ALLOCATED; 3174145256Sjkoshy 3175145256Sjkoshy /* 3176145256Sjkoshy * mark row disposition 3177145256Sjkoshy */ 3178145256Sjkoshy 3179145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 3180145256Sjkoshy PMC_MARK_ROW_STANDALONE(n); 3181145256Sjkoshy else 3182145256Sjkoshy PMC_MARK_ROW_THREAD(n); 3183145256Sjkoshy 3184145256Sjkoshy /* 3185145256Sjkoshy * Register this PMC with the current thread as its owner. 3186145256Sjkoshy */ 3187145256Sjkoshy 3188145256Sjkoshy if ((error = 3189145256Sjkoshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 3190145256Sjkoshy pmc_release_pmc_descriptor(pmc); 3191145256Sjkoshy FREE(pmc, M_PMC); 3192145256Sjkoshy pmc = NULL; 3193145256Sjkoshy break; 3194145256Sjkoshy } 3195145256Sjkoshy 3196145256Sjkoshy /* 3197145256Sjkoshy * Return the allocated index. 3198145256Sjkoshy */ 3199145256Sjkoshy 3200145774Sjkoshy pa.pm_pmcid = pmc->pm_id; 3201145256Sjkoshy 3202145256Sjkoshy error = copyout(&pa, arg, sizeof(pa)); 3203145256Sjkoshy } 3204145256Sjkoshy break; 3205145256Sjkoshy 3206145256Sjkoshy 3207145256Sjkoshy /* 3208145256Sjkoshy * Attach a PMC to a process. 3209145256Sjkoshy */ 3210145256Sjkoshy 3211145256Sjkoshy case PMC_OP_PMCATTACH: 3212145256Sjkoshy { 3213145256Sjkoshy struct pmc *pm; 3214145256Sjkoshy struct proc *p; 3215145256Sjkoshy struct pmc_op_pmcattach a; 3216145256Sjkoshy 3217145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3218145256Sjkoshy 3219145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3220145256Sjkoshy break; 3221145256Sjkoshy 3222145256Sjkoshy if (a.pm_pid < 0) { 3223145256Sjkoshy error = EINVAL; 3224145256Sjkoshy break; 3225145256Sjkoshy } else if (a.pm_pid == 0) 3226145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3227145256Sjkoshy 3228145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3229145256Sjkoshy break; 3230145256Sjkoshy 3231145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 3232145256Sjkoshy error = EINVAL; 3233145256Sjkoshy break; 3234145256Sjkoshy } 3235145256Sjkoshy 3236145256Sjkoshy /* PMCs may be (re)attached only when allocated or stopped */ 3237145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3238145256Sjkoshy error = EBUSY; 3239145256Sjkoshy break; 3240145256Sjkoshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 3241145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED) { 3242145256Sjkoshy error = EINVAL; 3243145256Sjkoshy break; 3244145256Sjkoshy } 3245145256Sjkoshy 3246145256Sjkoshy /* lookup pid */ 3247145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3248145256Sjkoshy error = ESRCH; 3249145256Sjkoshy break; 3250145256Sjkoshy } 3251145256Sjkoshy 3252145256Sjkoshy /* 3253145256Sjkoshy * Ignore processes that are working on exiting. 3254145256Sjkoshy */ 3255145256Sjkoshy if (p->p_flag & P_WEXIT) { 3256145256Sjkoshy error = ESRCH; 3257145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3258145256Sjkoshy break; 3259145256Sjkoshy } 3260145256Sjkoshy 3261145256Sjkoshy /* 3262145256Sjkoshy * we are allowed to attach a PMC to a process if 3263145256Sjkoshy * we can debug it. 3264145256Sjkoshy */ 3265145256Sjkoshy error = p_candebug(curthread, p); 3266145256Sjkoshy 3267145256Sjkoshy PROC_UNLOCK(p); 3268145256Sjkoshy 3269145256Sjkoshy if (error == 0) 3270145256Sjkoshy error = pmc_attach_process(p, pm); 3271145256Sjkoshy } 3272145256Sjkoshy break; 3273145256Sjkoshy 3274145256Sjkoshy 3275145256Sjkoshy /* 3276145256Sjkoshy * Detach an attached PMC from a process. 3277145256Sjkoshy */ 3278145256Sjkoshy 3279145256Sjkoshy case PMC_OP_PMCDETACH: 3280145256Sjkoshy { 3281145256Sjkoshy struct pmc *pm; 3282145256Sjkoshy struct proc *p; 3283145256Sjkoshy struct pmc_op_pmcattach a; 3284145256Sjkoshy 3285145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3286145256Sjkoshy break; 3287145256Sjkoshy 3288145256Sjkoshy if (a.pm_pid < 0) { 3289145256Sjkoshy error = EINVAL; 3290145256Sjkoshy break; 3291145256Sjkoshy } else if (a.pm_pid == 0) 3292145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3293145256Sjkoshy 3294145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3295145256Sjkoshy break; 3296145256Sjkoshy 3297145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3298145256Sjkoshy error = ESRCH; 3299145256Sjkoshy break; 3300145256Sjkoshy } 3301145256Sjkoshy 3302145256Sjkoshy /* 3303145256Sjkoshy * Treat processes that are in the process of exiting 3304145256Sjkoshy * as if they were not present. 3305145256Sjkoshy */ 3306145256Sjkoshy 3307145256Sjkoshy if (p->p_flag & P_WEXIT) 3308145256Sjkoshy error = ESRCH; 3309145256Sjkoshy 3310145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3311145256Sjkoshy 3312145256Sjkoshy if (error == 0) 3313145256Sjkoshy error = pmc_detach_process(p, pm); 3314145256Sjkoshy } 3315145256Sjkoshy break; 3316145256Sjkoshy 3317145256Sjkoshy 3318145256Sjkoshy /* 3319147191Sjkoshy * Retrieve the MSR number associated with the counter 3320147191Sjkoshy * 'pmc_id'. This allows processes to directly use RDPMC 3321147191Sjkoshy * instructions to read their PMCs, without the overhead of a 3322147191Sjkoshy * system call. 3323147191Sjkoshy */ 3324147191Sjkoshy 3325147191Sjkoshy case PMC_OP_PMCGETMSR: 3326147191Sjkoshy { 3327147191Sjkoshy int ri; 3328147191Sjkoshy struct pmc *pm; 3329147191Sjkoshy struct pmc_target *pt; 3330147191Sjkoshy struct pmc_op_getmsr gm; 3331147191Sjkoshy 3332147191Sjkoshy PMC_DOWNGRADE_SX(); 3333147191Sjkoshy 3334147191Sjkoshy /* CPU has no 'GETMSR' support */ 3335147191Sjkoshy if (md->pmd_get_msr == NULL) { 3336147191Sjkoshy error = ENOSYS; 3337147191Sjkoshy break; 3338147191Sjkoshy } 3339147191Sjkoshy 3340147191Sjkoshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3341147191Sjkoshy break; 3342147191Sjkoshy 3343147191Sjkoshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3344147191Sjkoshy break; 3345147191Sjkoshy 3346147191Sjkoshy /* 3347147191Sjkoshy * The allocated PMC has to be a process virtual PMC, 3348147191Sjkoshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3349147191Sjkoshy * read using the PMCREAD operation since they may be 3350147191Sjkoshy * allocated on a different CPU than the one we could 3351147191Sjkoshy * be running on at the time of the RDPMC instruction. 3352147191Sjkoshy * 3353147191Sjkoshy * The GETMSR operation is not allowed for PMCs that 3354147191Sjkoshy * are inherited across processes. 3355147191Sjkoshy */ 3356147191Sjkoshy 3357147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3358147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3359147191Sjkoshy error = EINVAL; 3360147191Sjkoshy break; 3361147191Sjkoshy } 3362147191Sjkoshy 3363147191Sjkoshy /* 3364147191Sjkoshy * It only makes sense to use a RDPMC (or its 3365147191Sjkoshy * equivalent instruction on non-x86 architectures) on 3366147191Sjkoshy * a process that has allocated and attached a PMC to 3367147191Sjkoshy * itself. Conversely the PMC is only allowed to have 3368147191Sjkoshy * one process attached to it -- its owner. 3369147191Sjkoshy */ 3370147191Sjkoshy 3371147191Sjkoshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3372147191Sjkoshy LIST_NEXT(pt, pt_next) != NULL || 3373147191Sjkoshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3374147191Sjkoshy error = EINVAL; 3375147191Sjkoshy break; 3376147191Sjkoshy } 3377147191Sjkoshy 3378147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3379147191Sjkoshy 3380147191Sjkoshy if ((error = (*md->pmd_get_msr)(ri, &gm.pm_msr)) < 0) 3381147191Sjkoshy break; 3382147191Sjkoshy 3383147191Sjkoshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3384147191Sjkoshy break; 3385147191Sjkoshy 3386147191Sjkoshy /* 3387147191Sjkoshy * Mark our process as using MSRs. Update machine 3388147191Sjkoshy * state using a forced context switch. 3389147191Sjkoshy */ 3390147191Sjkoshy 3391147191Sjkoshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3392147191Sjkoshy pmc_force_context_switch(); 3393147191Sjkoshy 3394147191Sjkoshy } 3395147191Sjkoshy break; 3396147191Sjkoshy 3397147191Sjkoshy /* 3398145256Sjkoshy * Release an allocated PMC 3399145256Sjkoshy */ 3400145256Sjkoshy 3401145256Sjkoshy case PMC_OP_PMCRELEASE: 3402145256Sjkoshy { 3403145256Sjkoshy pmc_id_t pmcid; 3404145256Sjkoshy struct pmc *pm; 3405145256Sjkoshy struct pmc_owner *po; 3406145256Sjkoshy struct pmc_op_simple sp; 3407145256Sjkoshy 3408145256Sjkoshy /* 3409145256Sjkoshy * Find PMC pointer for the named PMC. 3410145256Sjkoshy * 3411145256Sjkoshy * Use pmc_release_pmc_descriptor() to switch off the 3412145256Sjkoshy * PMC, remove all its target threads, and remove the 3413145256Sjkoshy * PMC from its owner's list. 3414145256Sjkoshy * 3415145256Sjkoshy * Remove the owner record if this is the last PMC 3416145256Sjkoshy * owned. 3417145256Sjkoshy * 3418145256Sjkoshy * Free up space. 3419145256Sjkoshy */ 3420145256Sjkoshy 3421145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3422145256Sjkoshy break; 3423145256Sjkoshy 3424145256Sjkoshy pmcid = sp.pm_pmcid; 3425145256Sjkoshy 3426145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3427145256Sjkoshy break; 3428145256Sjkoshy 3429145256Sjkoshy po = pm->pm_owner; 3430145256Sjkoshy pmc_release_pmc_descriptor(pm); 3431145256Sjkoshy pmc_maybe_remove_owner(po); 3432145256Sjkoshy 3433145256Sjkoshy FREE(pm, M_PMC); 3434145256Sjkoshy } 3435145256Sjkoshy break; 3436145256Sjkoshy 3437145256Sjkoshy 3438145256Sjkoshy /* 3439145256Sjkoshy * Read and/or write a PMC. 3440145256Sjkoshy */ 3441145256Sjkoshy 3442145256Sjkoshy case PMC_OP_PMCRW: 3443145256Sjkoshy { 3444145256Sjkoshy uint32_t cpu, ri; 3445145256Sjkoshy struct pmc *pm; 3446145256Sjkoshy struct pmc_op_pmcrw *pprw; 3447145256Sjkoshy struct pmc_op_pmcrw prw; 3448145256Sjkoshy struct pmc_binding pb; 3449145256Sjkoshy pmc_value_t oldvalue; 3450145256Sjkoshy 3451145256Sjkoshy PMC_DOWNGRADE_SX(); 3452145256Sjkoshy 3453145256Sjkoshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3454145256Sjkoshy break; 3455145256Sjkoshy 3456145301Simp ri = 0; 3457145256Sjkoshy PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3458145256Sjkoshy prw.pm_flags); 3459145256Sjkoshy 3460145256Sjkoshy /* must have at least one flag set */ 3461145256Sjkoshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3462145256Sjkoshy error = EINVAL; 3463145256Sjkoshy break; 3464145256Sjkoshy } 3465145256Sjkoshy 3466145256Sjkoshy /* locate pmc descriptor */ 3467145256Sjkoshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3468145256Sjkoshy break; 3469145256Sjkoshy 3470145256Sjkoshy /* Can't read a PMC that hasn't been started. */ 3471145256Sjkoshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3472145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED && 3473145256Sjkoshy pm->pm_state != PMC_STATE_RUNNING) { 3474145256Sjkoshy error = EINVAL; 3475145256Sjkoshy break; 3476145256Sjkoshy } 3477145256Sjkoshy 3478145256Sjkoshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3479145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3480145256Sjkoshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3481145256Sjkoshy error = EBUSY; 3482145256Sjkoshy break; 3483145256Sjkoshy } 3484145256Sjkoshy 3485145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3486145256Sjkoshy 3487145774Sjkoshy /* 3488145774Sjkoshy * If this PMC is attached to its owner (i.e., 3489145774Sjkoshy * the process requesting this operation) and 3490145774Sjkoshy * is running, then attempt to get an 3491145774Sjkoshy * upto-date reading from hardware for a READ. 3492145774Sjkoshy * Writes are only allowed when the PMC is 3493145774Sjkoshy * stopped, so only update the saved value 3494145774Sjkoshy * field. 3495145774Sjkoshy * 3496145774Sjkoshy * If the PMC is not running, or is not 3497145774Sjkoshy * attached to its owner, read/write to the 3498145774Sjkoshy * savedvalue field. 3499145774Sjkoshy */ 3500145774Sjkoshy 3501145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3502145774Sjkoshy 3503145256Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3504145774Sjkoshy cpu = curthread->td_oncpu; 3505145774Sjkoshy 3506145774Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3507145774Sjkoshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3508145774Sjkoshy (pm->pm_state == PMC_STATE_RUNNING)) 3509145774Sjkoshy error = (*md->pmd_read_pmc)(cpu, ri, 3510145774Sjkoshy &oldvalue); 3511145774Sjkoshy else 3512145774Sjkoshy oldvalue = pm->pm_gv.pm_savedvalue; 3513145774Sjkoshy } 3514145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3515145256Sjkoshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3516145774Sjkoshy 3517145256Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3518145256Sjkoshy 3519145256Sjkoshy } else { /* System mode PMCs */ 3520145774Sjkoshy cpu = PMC_TO_CPU(pm); 3521145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3522145256Sjkoshy 3523145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 3524145256Sjkoshy error = ENXIO; 3525145256Sjkoshy break; 3526145256Sjkoshy } 3527145256Sjkoshy 3528145256Sjkoshy /* move this thread to CPU 'cpu' */ 3529145256Sjkoshy pmc_save_cpu_binding(&pb); 3530145256Sjkoshy pmc_select_cpu(cpu); 3531145256Sjkoshy 3532145774Sjkoshy critical_enter(); 3533145256Sjkoshy /* save old value */ 3534145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3535145256Sjkoshy if ((error = (*md->pmd_read_pmc)(cpu, ri, 3536145256Sjkoshy &oldvalue))) 3537145256Sjkoshy goto error; 3538145256Sjkoshy /* write out new value */ 3539145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3540145256Sjkoshy error = (*md->pmd_write_pmc)(cpu, ri, 3541145256Sjkoshy prw.pm_value); 3542145256Sjkoshy error: 3543145774Sjkoshy critical_exit(); 3544145256Sjkoshy pmc_restore_cpu_binding(&pb); 3545145256Sjkoshy if (error) 3546145256Sjkoshy break; 3547145256Sjkoshy } 3548145256Sjkoshy 3549145256Sjkoshy pprw = (struct pmc_op_pmcrw *) arg; 3550145256Sjkoshy 3551153110Sru#ifdef DEBUG 3552145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3553145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3554145256Sjkoshy ri, prw.pm_value, oldvalue); 3555156778Sjkoshy else if (prw.pm_flags & PMC_F_OLDVALUE) 3556145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3557145256Sjkoshy#endif 3558145256Sjkoshy 3559145256Sjkoshy /* return old value if requested */ 3560145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3561145256Sjkoshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3562145256Sjkoshy sizeof(prw.pm_value)))) 3563145256Sjkoshy break; 3564145256Sjkoshy 3565145256Sjkoshy } 3566145256Sjkoshy break; 3567145256Sjkoshy 3568145256Sjkoshy 3569145256Sjkoshy /* 3570145256Sjkoshy * Set the sampling rate for a sampling mode PMC and the 3571145256Sjkoshy * initial count for a counting mode PMC. 3572145256Sjkoshy */ 3573145256Sjkoshy 3574145256Sjkoshy case PMC_OP_PMCSETCOUNT: 3575145256Sjkoshy { 3576145256Sjkoshy struct pmc *pm; 3577145256Sjkoshy struct pmc_op_pmcsetcount sc; 3578145256Sjkoshy 3579145256Sjkoshy PMC_DOWNGRADE_SX(); 3580145256Sjkoshy 3581145256Sjkoshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3582145256Sjkoshy break; 3583145256Sjkoshy 3584145256Sjkoshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3585145256Sjkoshy break; 3586145256Sjkoshy 3587145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3588145256Sjkoshy error = EBUSY; 3589145256Sjkoshy break; 3590145256Sjkoshy } 3591145256Sjkoshy 3592145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3593145256Sjkoshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3594145256Sjkoshy else 3595145256Sjkoshy pm->pm_sc.pm_initial = sc.pm_count; 3596145256Sjkoshy } 3597145256Sjkoshy break; 3598145256Sjkoshy 3599145256Sjkoshy 3600145256Sjkoshy /* 3601145256Sjkoshy * Start a PMC. 3602145256Sjkoshy */ 3603145256Sjkoshy 3604145256Sjkoshy case PMC_OP_PMCSTART: 3605145256Sjkoshy { 3606145256Sjkoshy pmc_id_t pmcid; 3607145256Sjkoshy struct pmc *pm; 3608145256Sjkoshy struct pmc_op_simple sp; 3609145256Sjkoshy 3610145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3611145256Sjkoshy 3612145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3613145256Sjkoshy break; 3614145256Sjkoshy 3615145256Sjkoshy pmcid = sp.pm_pmcid; 3616145256Sjkoshy 3617145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3618145256Sjkoshy break; 3619145256Sjkoshy 3620145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3621145774Sjkoshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3622145774Sjkoshy pm->pm_id, pmcid)); 3623145256Sjkoshy 3624145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3625145256Sjkoshy break; 3626145256Sjkoshy else if (pm->pm_state != PMC_STATE_STOPPED && 3627145256Sjkoshy pm->pm_state != PMC_STATE_ALLOCATED) { 3628145256Sjkoshy error = EINVAL; 3629145256Sjkoshy break; 3630145256Sjkoshy } 3631145256Sjkoshy 3632145256Sjkoshy error = pmc_start(pm); 3633145256Sjkoshy } 3634145256Sjkoshy break; 3635145256Sjkoshy 3636145256Sjkoshy 3637145256Sjkoshy /* 3638145256Sjkoshy * Stop a PMC. 3639145256Sjkoshy */ 3640145256Sjkoshy 3641145256Sjkoshy case PMC_OP_PMCSTOP: 3642145256Sjkoshy { 3643145256Sjkoshy pmc_id_t pmcid; 3644145256Sjkoshy struct pmc *pm; 3645145256Sjkoshy struct pmc_op_simple sp; 3646145256Sjkoshy 3647145256Sjkoshy PMC_DOWNGRADE_SX(); 3648145256Sjkoshy 3649145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3650145256Sjkoshy break; 3651145256Sjkoshy 3652145256Sjkoshy pmcid = sp.pm_pmcid; 3653145256Sjkoshy 3654145256Sjkoshy /* 3655145256Sjkoshy * Mark the PMC as inactive and invoke the MD stop 3656145256Sjkoshy * routines if needed. 3657145256Sjkoshy */ 3658145256Sjkoshy 3659145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3660145256Sjkoshy break; 3661145256Sjkoshy 3662145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3663145774Sjkoshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3664145774Sjkoshy pm->pm_id, pmcid)); 3665145256Sjkoshy 3666145256Sjkoshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3667145256Sjkoshy break; 3668145256Sjkoshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3669145256Sjkoshy error = EINVAL; 3670145256Sjkoshy break; 3671145256Sjkoshy } 3672145256Sjkoshy 3673145256Sjkoshy error = pmc_stop(pm); 3674145256Sjkoshy } 3675145256Sjkoshy break; 3676145256Sjkoshy 3677145256Sjkoshy 3678145256Sjkoshy /* 3679147867Sjkoshy * Write a user supplied value to the log file. 3680145256Sjkoshy */ 3681145256Sjkoshy 3682145256Sjkoshy case PMC_OP_WRITELOG: 3683145256Sjkoshy { 3684147191Sjkoshy struct pmc_op_writelog wl; 3685147191Sjkoshy struct pmc_owner *po; 3686145256Sjkoshy 3687145256Sjkoshy PMC_DOWNGRADE_SX(); 3688145256Sjkoshy 3689147191Sjkoshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 3690145256Sjkoshy break; 3691145256Sjkoshy 3692147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3693145256Sjkoshy error = EINVAL; 3694145256Sjkoshy break; 3695145256Sjkoshy } 3696145256Sjkoshy 3697147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 3698145774Sjkoshy error = EINVAL; 3699145774Sjkoshy break; 3700145774Sjkoshy } 3701145774Sjkoshy 3702147191Sjkoshy error = pmclog_process_userlog(po, &wl); 3703145256Sjkoshy } 3704145256Sjkoshy break; 3705145256Sjkoshy 3706147191Sjkoshy 3707145256Sjkoshy default: 3708145256Sjkoshy error = EINVAL; 3709145256Sjkoshy break; 3710145256Sjkoshy } 3711145256Sjkoshy 3712145256Sjkoshy if (is_sx_downgraded) 3713145256Sjkoshy sx_sunlock(&pmc_sx); 3714145256Sjkoshy else 3715145256Sjkoshy sx_xunlock(&pmc_sx); 3716145256Sjkoshy 3717145256Sjkoshy if (error) 3718145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 3719145256Sjkoshy 3720147191Sjkoshy PICKUP_GIANT(); 3721147191Sjkoshy 3722145256Sjkoshy return error; 3723145256Sjkoshy} 3724145256Sjkoshy 3725145256Sjkoshy/* 3726145256Sjkoshy * Helper functions 3727145256Sjkoshy */ 3728145256Sjkoshy 3729147191Sjkoshy 3730145256Sjkoshy/* 3731174395Sjkoshy * Mark the thread as needing callchain capture and post an AST. The 3732174395Sjkoshy * actual callchain capture will be done in a context where it is safe 3733174395Sjkoshy * to take page faults. 3734174395Sjkoshy */ 3735174395Sjkoshy 3736174395Sjkoshystatic void 3737174395Sjkoshypmc_post_callchain_ast(void) 3738174395Sjkoshy{ 3739174395Sjkoshy struct thread *td; 3740174395Sjkoshy 3741174395Sjkoshy td = curthread; 3742174395Sjkoshy 3743174395Sjkoshy /* 3744174395Sjkoshy * Mark this thread as needing processing in ast(). 3745174395Sjkoshy * td->td_pflags will be safe to touch as the process was in 3746174395Sjkoshy * user space when it was interrupted. 3747174395Sjkoshy */ 3748174395Sjkoshy td->td_pflags |= TDP_CALLCHAIN; 3749174395Sjkoshy 3750174395Sjkoshy /* 3751174395Sjkoshy * Again, since we've entered this function directly from 3752174395Sjkoshy * userland, `td' is guaranteed to be not locked by this CPU, 3753174395Sjkoshy * so its safe to try acquire the thread lock even though we 3754174395Sjkoshy * are executing in an NMI context. We need to acquire this 3755174395Sjkoshy * lock before touching `td_flags' because other CPUs may be 3756174395Sjkoshy * in the process of touching this field. 3757174395Sjkoshy */ 3758174395Sjkoshy thread_lock(td); 3759174395Sjkoshy td->td_flags |= TDF_ASTPENDING; 3760174395Sjkoshy thread_unlock(td); 3761174395Sjkoshy 3762174395Sjkoshy return; 3763174395Sjkoshy} 3764174395Sjkoshy 3765174395Sjkoshy/* 3766147191Sjkoshy * Interrupt processing. 3767147191Sjkoshy * 3768174395Sjkoshy * Find a free slot in the per-cpu array of samples and capture the 3769174395Sjkoshy * current callchain there. If a sample was successfully added, a bit 3770174395Sjkoshy * is set in mask 'pmc_cpumask' denoting that the DO_SAMPLES hook 3771174395Sjkoshy * needs to be invoked from the clock handler. 3772147191Sjkoshy * 3773147191Sjkoshy * This function is meant to be called from an NMI handler. It cannot 3774147191Sjkoshy * use any of the locking primitives supplied by the OS. 3775145256Sjkoshy */ 3776145256Sjkoshy 3777147191Sjkoshyint 3778174395Sjkoshypmc_process_interrupt(int cpu, struct pmc *pm, struct trapframe *tf, 3779174395Sjkoshy int inuserspace) 3780145256Sjkoshy{ 3781174395Sjkoshy int error, callchaindepth; 3782147191Sjkoshy struct thread *td; 3783147191Sjkoshy struct pmc_sample *ps; 3784147191Sjkoshy struct pmc_samplebuffer *psb; 3785145256Sjkoshy 3786147191Sjkoshy error = 0; 3787145256Sjkoshy 3788174395Sjkoshy /* 3789174395Sjkoshy * Allocate space for a sample buffer. 3790174395Sjkoshy */ 3791147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3792145256Sjkoshy 3793147191Sjkoshy ps = psb->ps_write; 3794174395Sjkoshy if (ps->ps_nsamples) { /* in use, reader hasn't caught up */ 3795147867Sjkoshy pm->pm_stalled = 1; 3796147191Sjkoshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 3797174395Sjkoshy PMCDBG(SAM,INT,1,"(spc) cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", 3798174395Sjkoshy cpu, pm, (void *) tf, inuserspace, 3799147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3800147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3801147191Sjkoshy error = ENOMEM; 3802147191Sjkoshy goto done; 3803147191Sjkoshy } 3804145256Sjkoshy 3805174395Sjkoshy 3806174395Sjkoshy /* Fill in entry. */ 3807174395Sjkoshy PMCDBG(SAM,INT,1,"cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", cpu, pm, 3808174395Sjkoshy (void *) tf, inuserspace, 3809147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3810147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3811145256Sjkoshy 3812174395Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); /* hold onto PMC */ 3813147191Sjkoshy ps->ps_pmc = pm; 3814147191Sjkoshy if ((td = curthread) && td->td_proc) 3815147191Sjkoshy ps->ps_pid = td->td_proc->p_pid; 3816147191Sjkoshy else 3817147191Sjkoshy ps->ps_pid = -1; 3818174395Sjkoshy ps->ps_cpu = cpu; 3819174395Sjkoshy ps->ps_flags = inuserspace ? PMC_CC_F_USERSPACE : 0; 3820145256Sjkoshy 3821174395Sjkoshy callchaindepth = (pm->pm_flags & PMC_F_CALLCHAIN) ? 3822174395Sjkoshy pmc_callchaindepth : 1; 3823174395Sjkoshy 3824174395Sjkoshy if (callchaindepth == 1) 3825174395Sjkoshy ps->ps_pc[0] = PMC_TRAPFRAME_TO_PC(tf); 3826174395Sjkoshy else { 3827174395Sjkoshy /* 3828174395Sjkoshy * Kernel stack traversals can be done immediately, 3829174395Sjkoshy * while we defer to an AST for user space traversals. 3830174395Sjkoshy */ 3831174395Sjkoshy if (!inuserspace) 3832174395Sjkoshy callchaindepth = 3833174395Sjkoshy pmc_save_kernel_callchain(ps->ps_pc, 3834174395Sjkoshy callchaindepth, tf); 3835174395Sjkoshy else { 3836174395Sjkoshy pmc_post_callchain_ast(); 3837174395Sjkoshy callchaindepth = PMC_SAMPLE_INUSE; 3838174395Sjkoshy } 3839174395Sjkoshy } 3840174395Sjkoshy 3841174395Sjkoshy ps->ps_nsamples = callchaindepth; /* mark entry as in use */ 3842174395Sjkoshy 3843147191Sjkoshy /* increment write pointer, modulo ring buffer size */ 3844147191Sjkoshy ps++; 3845147191Sjkoshy if (ps == psb->ps_fence) 3846147191Sjkoshy psb->ps_write = psb->ps_samples; 3847147191Sjkoshy else 3848147191Sjkoshy psb->ps_write = ps; 3849145256Sjkoshy 3850147191Sjkoshy done: 3851147191Sjkoshy /* mark CPU as needing processing */ 3852147191Sjkoshy atomic_set_rel_int(&pmc_cpumask, (1 << cpu)); 3853147191Sjkoshy 3854174395Sjkoshy return (error); 3855145256Sjkoshy} 3856145256Sjkoshy 3857174395Sjkoshy/* 3858174395Sjkoshy * Capture a user call chain. This function will be called from ast() 3859174395Sjkoshy * before control returns to userland and before the process gets 3860174395Sjkoshy * rescheduled. 3861174395Sjkoshy */ 3862147191Sjkoshy 3863174395Sjkoshystatic void 3864174395Sjkoshypmc_capture_user_callchain(int cpu, struct trapframe *tf) 3865174395Sjkoshy{ 3866174395Sjkoshy int i; 3867174395Sjkoshy struct pmc *pm; 3868174395Sjkoshy struct pmc_sample *ps; 3869174395Sjkoshy struct pmc_samplebuffer *psb; 3870174395Sjkoshy 3871174395Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3872174395Sjkoshy 3873174395Sjkoshy /* 3874174395Sjkoshy * Iterate through all deferred callchain requests. 3875174395Sjkoshy */ 3876174395Sjkoshy 3877174395Sjkoshy for (i = 0; i < pmc_nsamples; i++) { 3878174395Sjkoshy 3879174395Sjkoshy ps = &psb->ps_samples[i]; 3880174395Sjkoshy if (ps->ps_nsamples != PMC_SAMPLE_INUSE) 3881174395Sjkoshy continue; 3882174395Sjkoshy 3883174395Sjkoshy pm = ps->ps_pmc; 3884174395Sjkoshy 3885174395Sjkoshy KASSERT(pm->pm_flags & PMC_F_CALLCHAIN, 3886174395Sjkoshy ("[pmc,%d] Retrieving callchain for PMC that doesn't " 3887174395Sjkoshy "want it", __LINE__)); 3888174395Sjkoshy 3889174395Sjkoshy /* 3890174395Sjkoshy * Retrieve the callchain and mark the sample buffer 3891174395Sjkoshy * as 'processable' by the timer tick sweep code. 3892174395Sjkoshy */ 3893174395Sjkoshy ps->ps_nsamples = pmc_save_user_callchain(ps->ps_pc, 3894174395Sjkoshy pmc_callchaindepth, tf); 3895174395Sjkoshy } 3896174395Sjkoshy 3897174395Sjkoshy return; 3898174395Sjkoshy} 3899174395Sjkoshy 3900174395Sjkoshy 3901145256Sjkoshy/* 3902147191Sjkoshy * Process saved PC samples. 3903145256Sjkoshy */ 3904145256Sjkoshy 3905145256Sjkoshystatic void 3906147191Sjkoshypmc_process_samples(int cpu) 3907145256Sjkoshy{ 3908147191Sjkoshy int n, ri; 3909147191Sjkoshy struct pmc *pm; 3910147191Sjkoshy struct thread *td; 3911147191Sjkoshy struct pmc_owner *po; 3912147191Sjkoshy struct pmc_sample *ps; 3913147191Sjkoshy struct pmc_samplebuffer *psb; 3914145256Sjkoshy 3915147191Sjkoshy KASSERT(PCPU_GET(cpuid) == cpu, 3916147191Sjkoshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 3917147191Sjkoshy PCPU_GET(cpuid), cpu)); 3918145256Sjkoshy 3919147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3920147191Sjkoshy 3921147191Sjkoshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 3922147191Sjkoshy 3923147191Sjkoshy ps = psb->ps_read; 3924174395Sjkoshy if (ps->ps_nsamples == PMC_SAMPLE_FREE) 3925147191Sjkoshy break; 3926174395Sjkoshy if (ps->ps_nsamples == PMC_SAMPLE_INUSE) { 3927174395Sjkoshy /* Need a rescan at a later time. */ 3928174395Sjkoshy atomic_set_rel_int(&pmc_cpumask, (1 << cpu)); 3929174395Sjkoshy break; 3930174395Sjkoshy } 3931147191Sjkoshy 3932147191Sjkoshy pm = ps->ps_pmc; 3933147191Sjkoshy po = pm->pm_owner; 3934147191Sjkoshy 3935147191Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 3936147191Sjkoshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 3937147191Sjkoshy pm, PMC_TO_MODE(pm))); 3938147191Sjkoshy 3939147191Sjkoshy /* Ignore PMCs that have been switched off */ 3940147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 3941147191Sjkoshy goto entrydone; 3942147191Sjkoshy 3943174395Sjkoshy PMCDBG(SAM,OPS,1,"cpu=%d pm=%p n=%d fl=%x wr=%d rd=%d", cpu, 3944174395Sjkoshy pm, ps->ps_nsamples, ps->ps_flags, 3945147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3946147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3947147191Sjkoshy 3948147191Sjkoshy /* 3949147191Sjkoshy * If this is a process-mode PMC that is attached to 3950147191Sjkoshy * its owner, and if the PC is in user mode, update 3951147191Sjkoshy * profiling statistics like timer-based profiling 3952147191Sjkoshy * would have done. 3953147191Sjkoshy */ 3954147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 3955174395Sjkoshy if (ps->ps_flags & PMC_CC_F_USERSPACE) { 3956147191Sjkoshy td = FIRST_THREAD_IN_PROC(po->po_owner); 3957174395Sjkoshy addupc_intr(td, ps->ps_pc[0], 1); 3958147191Sjkoshy } 3959147191Sjkoshy goto entrydone; 3960147191Sjkoshy } 3961147191Sjkoshy 3962147191Sjkoshy /* 3963147191Sjkoshy * Otherwise, this is either a sampling mode PMC that 3964147191Sjkoshy * is attached to a different process than its owner, 3965147191Sjkoshy * or a system-wide sampling PMC. Dispatch a log 3966147191Sjkoshy * entry to the PMC's owner process. 3967147191Sjkoshy */ 3968147191Sjkoshy 3969174395Sjkoshy pmclog_process_callchain(pm, ps); 3970147191Sjkoshy 3971147191Sjkoshy entrydone: 3972174395Sjkoshy ps->ps_nsamples = 0; /* mark entry as free */ 3973147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 3974147191Sjkoshy 3975147191Sjkoshy /* increment read pointer, modulo sample size */ 3976147191Sjkoshy if (++ps == psb->ps_fence) 3977147191Sjkoshy psb->ps_read = psb->ps_samples; 3978147191Sjkoshy else 3979147191Sjkoshy psb->ps_read = ps; 3980147191Sjkoshy } 3981147191Sjkoshy 3982147191Sjkoshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 3983147191Sjkoshy 3984147191Sjkoshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 3985147191Sjkoshy if (n == 0) 3986147191Sjkoshy return; 3987147191Sjkoshy 3988147191Sjkoshy /* 3989147191Sjkoshy * Restart any stalled sampling PMCs on this CPU. 3990147191Sjkoshy * 3991147867Sjkoshy * If the NMI handler sets the pm_stalled field of a PMC after 3992147867Sjkoshy * the check below, we'll end up processing the stalled PMC at 3993147867Sjkoshy * the next hardclock tick. 3994147191Sjkoshy */ 3995147191Sjkoshy for (n = 0; n < md->pmd_npmc; n++) { 3996147191Sjkoshy (void) (*md->pmd_get_config)(cpu,n,&pm); 3997147191Sjkoshy if (pm == NULL || /* !cfg'ed */ 3998147191Sjkoshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 3999147191Sjkoshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 4000147867Sjkoshy pm->pm_stalled == 0) /* !stalled */ 4001147191Sjkoshy continue; 4002147191Sjkoshy 4003147867Sjkoshy pm->pm_stalled = 0; 4004147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 4005147191Sjkoshy (*md->pmd_start_pmc)(cpu, ri); 4006147191Sjkoshy } 4007145256Sjkoshy} 4008145256Sjkoshy 4009145256Sjkoshy/* 4010145256Sjkoshy * Event handlers. 4011145256Sjkoshy */ 4012145256Sjkoshy 4013145256Sjkoshy/* 4014145256Sjkoshy * Handle a process exit. 4015145256Sjkoshy * 4016147191Sjkoshy * Remove this process from all hash tables. If this process 4017147191Sjkoshy * owned any PMCs, turn off those PMCs and deallocate them, 4018147191Sjkoshy * removing any associations with target processes. 4019147191Sjkoshy * 4020147191Sjkoshy * This function will be called by the last 'thread' of a 4021147191Sjkoshy * process. 4022147191Sjkoshy * 4023145256Sjkoshy * XXX This eventhandler gets called early in the exit process. 4024145256Sjkoshy * Consider using a 'hook' invocation from thread_exit() or equivalent 4025145256Sjkoshy * spot. Another negative is that kse_exit doesn't seem to call 4026145256Sjkoshy * exit1() [??]. 4027147191Sjkoshy * 4028145256Sjkoshy */ 4029145256Sjkoshy 4030145256Sjkoshystatic void 4031145256Sjkoshypmc_process_exit(void *arg __unused, struct proc *p) 4032145256Sjkoshy{ 4033145256Sjkoshy int is_using_hwpmcs; 4034147191Sjkoshy int cpu; 4035147191Sjkoshy unsigned int ri; 4036147191Sjkoshy struct pmc *pm; 4037147191Sjkoshy struct pmc_process *pp; 4038147191Sjkoshy struct pmc_owner *po; 4039147191Sjkoshy pmc_value_t newvalue, tmp; 4040145256Sjkoshy 4041145256Sjkoshy PROC_LOCK(p); 4042145256Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 4043145256Sjkoshy PROC_UNLOCK(p); 4044145256Sjkoshy 4045147191Sjkoshy /* 4046147191Sjkoshy * Log a sysexit event to all SS PMC owners. 4047147191Sjkoshy */ 4048147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4049147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4050147191Sjkoshy pmclog_process_sysexit(po, p->p_pid); 4051145256Sjkoshy 4052147191Sjkoshy if (!is_using_hwpmcs) 4053147191Sjkoshy return; 4054147191Sjkoshy 4055147191Sjkoshy PMC_GET_SX_XLOCK(); 4056147191Sjkoshy PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 4057147191Sjkoshy p->p_comm); 4058147191Sjkoshy 4059147191Sjkoshy /* 4060147191Sjkoshy * Since this code is invoked by the last thread in an exiting 4061147191Sjkoshy * process, we would have context switched IN at some prior 4062147191Sjkoshy * point. However, with PREEMPTION, kernel mode context 4063147191Sjkoshy * switches may happen any time, so we want to disable a 4064147191Sjkoshy * context switch OUT till we get any PMCs targetting this 4065147191Sjkoshy * process off the hardware. 4066147191Sjkoshy * 4067147191Sjkoshy * We also need to atomically remove this process' 4068147191Sjkoshy * entry from our target process hash table, using 4069147191Sjkoshy * PMC_FLAG_REMOVE. 4070147191Sjkoshy */ 4071147191Sjkoshy PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 4072147191Sjkoshy p->p_comm); 4073147191Sjkoshy 4074147191Sjkoshy critical_enter(); /* no preemption */ 4075147191Sjkoshy 4076147191Sjkoshy cpu = curthread->td_oncpu; 4077147191Sjkoshy 4078147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, 4079147191Sjkoshy PMC_FLAG_REMOVE)) != NULL) { 4080147191Sjkoshy 4081147191Sjkoshy PMCDBG(PRC,EXT,2, 4082147191Sjkoshy "process-exit proc=%p pmc-process=%p", p, pp); 4083147191Sjkoshy 4084147191Sjkoshy /* 4085147191Sjkoshy * The exiting process could the target of 4086147191Sjkoshy * some PMCs which will be running on 4087147191Sjkoshy * currently executing CPU. 4088147191Sjkoshy * 4089147191Sjkoshy * We need to turn these PMCs off like we 4090147191Sjkoshy * would do at context switch OUT time. 4091147191Sjkoshy */ 4092147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 4093147191Sjkoshy 4094147191Sjkoshy /* 4095147191Sjkoshy * Pick up the pmc pointer from hardware 4096147191Sjkoshy * state similar to the CSW_OUT code. 4097147191Sjkoshy */ 4098147191Sjkoshy pm = NULL; 4099147191Sjkoshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 4100147191Sjkoshy 4101147191Sjkoshy PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 4102147191Sjkoshy 4103147191Sjkoshy if (pm == NULL || 4104147191Sjkoshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 4105147191Sjkoshy continue; 4106147191Sjkoshy 4107147191Sjkoshy PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 4108147191Sjkoshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 4109147191Sjkoshy pm, pm->pm_state); 4110147191Sjkoshy 4111147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 4112147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 4113147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 4114147191Sjkoshy 4115147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 4116147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 4117147191Sjkoshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 4118147191Sjkoshy 4119147191Sjkoshy (void) md->pmd_stop_pmc(cpu, ri); 4120147191Sjkoshy 4121147191Sjkoshy KASSERT(pm->pm_runcount > 0, 4122147191Sjkoshy ("[pmc,%d] bad runcount ri %d rc %d", 4123147191Sjkoshy __LINE__, ri, pm->pm_runcount)); 4124147191Sjkoshy 4125147867Sjkoshy /* Stop hardware only if it is actually running */ 4126147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 4127147867Sjkoshy pm->pm_stalled == 0) { 4128147191Sjkoshy md->pmd_read_pmc(cpu, ri, &newvalue); 4129147191Sjkoshy tmp = newvalue - 4130147191Sjkoshy PMC_PCPU_SAVED(cpu,ri); 4131147191Sjkoshy 4132147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 4133147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 4134147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 4135147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 4136147191Sjkoshy } 4137147191Sjkoshy 4138147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount,1); 4139147191Sjkoshy 4140147191Sjkoshy KASSERT((int) pm->pm_runcount >= 0, 4141147191Sjkoshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 4142147191Sjkoshy 4143147191Sjkoshy (void) md->pmd_config_pmc(cpu, ri, NULL); 4144147191Sjkoshy } 4145147191Sjkoshy 4146147191Sjkoshy /* 4147147191Sjkoshy * Inform the MD layer of this pseudo "context switch 4148147191Sjkoshy * out" 4149147191Sjkoshy */ 4150147191Sjkoshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 4151147191Sjkoshy 4152147191Sjkoshy critical_exit(); /* ok to be pre-empted now */ 4153147191Sjkoshy 4154147191Sjkoshy /* 4155147191Sjkoshy * Unlink this process from the PMCs that are 4156147191Sjkoshy * targetting it. This will send a signal to 4157147191Sjkoshy * all PMC owner's whose PMCs are orphaned. 4158147191Sjkoshy * 4159147191Sjkoshy * Log PMC value at exit time if requested. 4160147191Sjkoshy */ 4161147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4162147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 4163147867Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 4164147867Sjkoshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 4165147191Sjkoshy pmclog_process_procexit(pm, pp); 4166147191Sjkoshy pmc_unlink_target_process(pm, pp); 4167147191Sjkoshy } 4168147191Sjkoshy FREE(pp, M_PMC); 4169147191Sjkoshy 4170147191Sjkoshy } else 4171147191Sjkoshy critical_exit(); /* pp == NULL */ 4172147191Sjkoshy 4173147191Sjkoshy 4174147191Sjkoshy /* 4175147191Sjkoshy * If the process owned PMCs, free them up and free up 4176147191Sjkoshy * memory. 4177147191Sjkoshy */ 4178147191Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 4179147191Sjkoshy pmc_remove_owner(po); 4180147191Sjkoshy pmc_destroy_owner_descriptor(po); 4181145256Sjkoshy } 4182147191Sjkoshy 4183147191Sjkoshy sx_xunlock(&pmc_sx); 4184145256Sjkoshy} 4185145256Sjkoshy 4186145256Sjkoshy/* 4187145256Sjkoshy * Handle a process fork. 4188145256Sjkoshy * 4189145256Sjkoshy * If the parent process 'p1' is under HWPMC monitoring, then copy 4190145256Sjkoshy * over any attached PMCs that have 'do_descendants' semantics. 4191145256Sjkoshy */ 4192145256Sjkoshy 4193145256Sjkoshystatic void 4194147191Sjkoshypmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 4195145256Sjkoshy int flags) 4196145256Sjkoshy{ 4197145256Sjkoshy int is_using_hwpmcs; 4198147191Sjkoshy unsigned int ri; 4199147191Sjkoshy uint32_t do_descendants; 4200147191Sjkoshy struct pmc *pm; 4201147191Sjkoshy struct pmc_owner *po; 4202147191Sjkoshy struct pmc_process *ppnew, *ppold; 4203145256Sjkoshy 4204145256Sjkoshy (void) flags; /* unused parameter */ 4205145256Sjkoshy 4206145256Sjkoshy PROC_LOCK(p1); 4207145256Sjkoshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 4208145256Sjkoshy PROC_UNLOCK(p1); 4209145256Sjkoshy 4210147191Sjkoshy /* 4211147191Sjkoshy * If there are system-wide sampling PMCs active, we need to 4212147191Sjkoshy * log all fork events to their owner's logs. 4213147191Sjkoshy */ 4214147191Sjkoshy 4215147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4216147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4217147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 4218147191Sjkoshy 4219147191Sjkoshy if (!is_using_hwpmcs) 4220147191Sjkoshy return; 4221147191Sjkoshy 4222147191Sjkoshy PMC_GET_SX_XLOCK(); 4223147191Sjkoshy PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 4224147191Sjkoshy p1->p_pid, p1->p_comm, newproc); 4225147191Sjkoshy 4226147191Sjkoshy /* 4227147191Sjkoshy * If the parent process (curthread->td_proc) is a 4228147191Sjkoshy * target of any PMCs, look for PMCs that are to be 4229147191Sjkoshy * inherited, and link these into the new process 4230147191Sjkoshy * descriptor. 4231147191Sjkoshy */ 4232147191Sjkoshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 4233147191Sjkoshy PMC_FLAG_NONE)) == NULL) 4234147191Sjkoshy goto done; /* nothing to do */ 4235147191Sjkoshy 4236147191Sjkoshy do_descendants = 0; 4237147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4238147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 4239147191Sjkoshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 4240147191Sjkoshy if (do_descendants == 0) /* nothing to do */ 4241147191Sjkoshy goto done; 4242147191Sjkoshy 4243147191Sjkoshy /* allocate a descriptor for the new process */ 4244147191Sjkoshy if ((ppnew = pmc_find_process_descriptor(newproc, 4245147191Sjkoshy PMC_FLAG_ALLOCATE)) == NULL) 4246147191Sjkoshy goto done; 4247147191Sjkoshy 4248147191Sjkoshy /* 4249147191Sjkoshy * Run through all PMCs that were targeting the old process 4250147191Sjkoshy * and which specified F_DESCENDANTS and attach them to the 4251147191Sjkoshy * new process. 4252147191Sjkoshy * 4253147191Sjkoshy * Log the fork event to all owners of PMCs attached to this 4254147191Sjkoshy * process, if not already logged. 4255147191Sjkoshy */ 4256147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4257147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 4258147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 4259147191Sjkoshy pmc_link_target_process(pm, ppnew); 4260147191Sjkoshy po = pm->pm_owner; 4261147191Sjkoshy if (po->po_sscount == 0 && 4262147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 4263147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, 4264147191Sjkoshy newproc->p_pid); 4265147191Sjkoshy } 4266147191Sjkoshy 4267147191Sjkoshy /* 4268147191Sjkoshy * Now mark the new process as being tracked by this driver. 4269147191Sjkoshy */ 4270147191Sjkoshy PROC_LOCK(newproc); 4271147191Sjkoshy newproc->p_flag |= P_HWPMC; 4272147191Sjkoshy PROC_UNLOCK(newproc); 4273147191Sjkoshy 4274147191Sjkoshy done: 4275147191Sjkoshy sx_xunlock(&pmc_sx); 4276145256Sjkoshy} 4277145256Sjkoshy 4278145256Sjkoshy 4279145256Sjkoshy/* 4280145256Sjkoshy * initialization 4281145256Sjkoshy */ 4282145256Sjkoshy 4283145256Sjkoshystatic const char *pmc_name_of_pmcclass[] = { 4284145256Sjkoshy#undef __PMC_CLASS 4285145256Sjkoshy#define __PMC_CLASS(N) #N , 4286145256Sjkoshy __PMC_CLASSES() 4287145256Sjkoshy}; 4288145256Sjkoshy 4289145256Sjkoshystatic int 4290145256Sjkoshypmc_initialize(void) 4291145256Sjkoshy{ 4292147191Sjkoshy int cpu, error, n; 4293145256Sjkoshy struct pmc_binding pb; 4294174395Sjkoshy struct pmc_sample *ps; 4295147191Sjkoshy struct pmc_samplebuffer *sb; 4296145256Sjkoshy 4297145256Sjkoshy md = NULL; 4298145256Sjkoshy error = 0; 4299145256Sjkoshy 4300153110Sru#ifdef DEBUG 4301145256Sjkoshy /* parse debug flags first */ 4302145256Sjkoshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 4303145256Sjkoshy pmc_debugstr, sizeof(pmc_debugstr))) 4304145256Sjkoshy pmc_debugflags_parse(pmc_debugstr, 4305145256Sjkoshy pmc_debugstr+strlen(pmc_debugstr)); 4306145256Sjkoshy#endif 4307145256Sjkoshy 4308145256Sjkoshy PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 4309145256Sjkoshy 4310148562Sjkoshy /* check kernel version */ 4311148562Sjkoshy if (pmc_kernel_version != PMC_VERSION) { 4312148562Sjkoshy if (pmc_kernel_version == 0) 4313148562Sjkoshy printf("hwpmc: this kernel has not been compiled with " 4314148562Sjkoshy "'options HWPMC_HOOKS'.\n"); 4315148562Sjkoshy else 4316148562Sjkoshy printf("hwpmc: kernel version (0x%x) does not match " 4317148562Sjkoshy "module version (0x%x).\n", pmc_kernel_version, 4318148562Sjkoshy PMC_VERSION); 4319148562Sjkoshy return EPROGMISMATCH; 4320148562Sjkoshy } 4321148562Sjkoshy 4322145256Sjkoshy /* 4323145256Sjkoshy * check sysctl parameters 4324145256Sjkoshy */ 4325145256Sjkoshy 4326145256Sjkoshy if (pmc_hashsize <= 0) { 4327174395Sjkoshy (void) printf("hwpmc: tunable \"hashsize\"=%d must be " 4328174395Sjkoshy "greater than zero.\n", pmc_hashsize); 4329145256Sjkoshy pmc_hashsize = PMC_HASH_SIZE; 4330145256Sjkoshy } 4331145256Sjkoshy 4332147191Sjkoshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 4333174395Sjkoshy (void) printf("hwpmc: tunable \"nsamples\"=%d out of " 4334174395Sjkoshy "range.\n", pmc_nsamples); 4335147191Sjkoshy pmc_nsamples = PMC_NSAMPLES; 4336147191Sjkoshy } 4337145256Sjkoshy 4338174395Sjkoshy if (pmc_callchaindepth <= 0 || 4339174395Sjkoshy pmc_callchaindepth > PMC_CALLCHAIN_DEPTH_MAX) { 4340174395Sjkoshy (void) printf("hwpmc: tunable \"callchaindepth\"=%d out of " 4341174395Sjkoshy "range.\n", pmc_callchaindepth); 4342174395Sjkoshy pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 4343174395Sjkoshy } 4344174395Sjkoshy 4345147191Sjkoshy md = pmc_md_initialize(); 4346147191Sjkoshy 4347145256Sjkoshy if (md == NULL || md->pmd_init == NULL) 4348145256Sjkoshy return ENOSYS; 4349145256Sjkoshy 4350145256Sjkoshy /* allocate space for the per-cpu array */ 4351145256Sjkoshy MALLOC(pmc_pcpu, struct pmc_cpu **, mp_ncpus * sizeof(struct pmc_cpu *), 4352145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4353145256Sjkoshy 4354145256Sjkoshy /* per-cpu 'saved values' for managing process-mode PMCs */ 4355145256Sjkoshy MALLOC(pmc_pcpu_saved, pmc_value_t *, 4356145256Sjkoshy sizeof(pmc_value_t) * mp_ncpus * md->pmd_npmc, M_PMC, M_WAITOK); 4357145256Sjkoshy 4358145256Sjkoshy /* perform cpu dependent initialization */ 4359145256Sjkoshy pmc_save_cpu_binding(&pb); 4360145256Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4361145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4362145256Sjkoshy continue; 4363145256Sjkoshy pmc_select_cpu(cpu); 4364145256Sjkoshy if ((error = md->pmd_init(cpu)) != 0) 4365145256Sjkoshy break; 4366145256Sjkoshy } 4367145256Sjkoshy pmc_restore_cpu_binding(&pb); 4368145256Sjkoshy 4369145256Sjkoshy if (error != 0) 4370145256Sjkoshy return error; 4371145256Sjkoshy 4372147191Sjkoshy /* allocate space for the sample array */ 4373147191Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4374147191Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4375147191Sjkoshy continue; 4376147191Sjkoshy MALLOC(sb, struct pmc_samplebuffer *, 4377147191Sjkoshy sizeof(struct pmc_samplebuffer) + 4378147191Sjkoshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4379147191Sjkoshy M_WAITOK|M_ZERO); 4380147191Sjkoshy 4381147191Sjkoshy sb->ps_read = sb->ps_write = sb->ps_samples; 4382153735Sjkoshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4383147191Sjkoshy KASSERT(pmc_pcpu[cpu] != NULL, 4384147191Sjkoshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4385147191Sjkoshy 4386174395Sjkoshy MALLOC(sb->ps_callchains, uintptr_t *, 4387174395Sjkoshy pmc_callchaindepth * pmc_nsamples * sizeof(uintptr_t), 4388174395Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4389174395Sjkoshy 4390174395Sjkoshy for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4391174395Sjkoshy ps->ps_pc = sb->ps_callchains + 4392174395Sjkoshy (n * pmc_callchaindepth); 4393174395Sjkoshy 4394147191Sjkoshy pmc_pcpu[cpu]->pc_sb = sb; 4395147191Sjkoshy } 4396147191Sjkoshy 4397145256Sjkoshy /* allocate space for the row disposition array */ 4398145256Sjkoshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 4399145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4400145256Sjkoshy 4401145256Sjkoshy KASSERT(pmc_pmcdisp != NULL, 4402145256Sjkoshy ("[pmc,%d] pmcdisp allocation returned NULL", __LINE__)); 4403145256Sjkoshy 4404145256Sjkoshy /* mark all PMCs as available */ 4405145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 4406145256Sjkoshy PMC_MARK_ROW_FREE(n); 4407145256Sjkoshy 4408145256Sjkoshy /* allocate thread hash tables */ 4409145256Sjkoshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 4410145256Sjkoshy &pmc_ownerhashmask); 4411145256Sjkoshy 4412145256Sjkoshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 4413145256Sjkoshy &pmc_processhashmask); 4414168856Sjkoshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc-leaf", 4415168856Sjkoshy MTX_SPIN); 4416145256Sjkoshy 4417147191Sjkoshy LIST_INIT(&pmc_ss_owners); 4418147191Sjkoshy pmc_ss_count = 0; 4419147191Sjkoshy 4420145256Sjkoshy /* allocate a pool of spin mutexes */ 4421168856Sjkoshy pmc_mtxpool = mtx_pool_create("pmc-leaf", pmc_mtxpool_size, 4422168856Sjkoshy MTX_SPIN); 4423145256Sjkoshy 4424145256Sjkoshy PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4425145256Sjkoshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4426145256Sjkoshy pmc_processhash, pmc_processhashmask); 4427145256Sjkoshy 4428145256Sjkoshy /* register process {exit,fork,exec} handlers */ 4429145256Sjkoshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4430145256Sjkoshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4431145256Sjkoshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4432145256Sjkoshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4433145256Sjkoshy 4434147191Sjkoshy /* initialize logging */ 4435147191Sjkoshy pmclog_initialize(); 4436147191Sjkoshy 4437145256Sjkoshy /* set hook functions */ 4438145256Sjkoshy pmc_intr = md->pmd_intr; 4439145256Sjkoshy pmc_hook = pmc_hook_handler; 4440145256Sjkoshy 4441145256Sjkoshy if (error == 0) { 4442145256Sjkoshy printf(PMC_MODULE_NAME ":"); 4443149373Sjkoshy for (n = 0; n < (int) md->pmd_nclass; n++) { 4444149373Sjkoshy printf(" %s/%d/0x%b", 4445145774Sjkoshy pmc_name_of_pmcclass[md->pmd_classes[n].pm_class], 4446149373Sjkoshy md->pmd_nclasspmcs[n], 4447149373Sjkoshy md->pmd_classes[n].pm_caps, 4448149373Sjkoshy "\20" 4449149373Sjkoshy "\1INT\2USR\3SYS\4EDG\5THR" 4450149373Sjkoshy "\6REA\7WRI\10INV\11QUA\12PRC" 4451149373Sjkoshy "\13TAG\14CSC"); 4452149373Sjkoshy } 4453145256Sjkoshy printf("\n"); 4454145256Sjkoshy } 4455145256Sjkoshy 4456145256Sjkoshy return error; 4457145256Sjkoshy} 4458145256Sjkoshy 4459145256Sjkoshy/* prepare to be unloaded */ 4460145256Sjkoshystatic void 4461145256Sjkoshypmc_cleanup(void) 4462145256Sjkoshy{ 4463145256Sjkoshy int cpu; 4464145256Sjkoshy struct pmc_ownerhash *ph; 4465145256Sjkoshy struct pmc_owner *po, *tmp; 4466145256Sjkoshy struct pmc_binding pb; 4467153110Sru#ifdef DEBUG 4468145256Sjkoshy struct pmc_processhash *prh; 4469145256Sjkoshy#endif 4470145256Sjkoshy 4471145256Sjkoshy PMCDBG(MOD,INI,0, "%s", "cleanup"); 4472145256Sjkoshy 4473147191Sjkoshy /* switch off sampling */ 4474147191Sjkoshy atomic_store_rel_int(&pmc_cpumask, 0); 4475147191Sjkoshy pmc_intr = NULL; 4476145256Sjkoshy 4477145256Sjkoshy sx_xlock(&pmc_sx); 4478145256Sjkoshy if (pmc_hook == NULL) { /* being unloaded already */ 4479145256Sjkoshy sx_xunlock(&pmc_sx); 4480145256Sjkoshy return; 4481145256Sjkoshy } 4482145256Sjkoshy 4483145256Sjkoshy pmc_hook = NULL; /* prevent new threads from entering module */ 4484145256Sjkoshy 4485145256Sjkoshy /* deregister event handlers */ 4486145256Sjkoshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 4487145256Sjkoshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 4488145256Sjkoshy 4489145256Sjkoshy /* send SIGBUS to all owner threads, free up allocations */ 4490145256Sjkoshy if (pmc_ownerhash) 4491145256Sjkoshy for (ph = pmc_ownerhash; 4492145256Sjkoshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 4493145256Sjkoshy ph++) { 4494145256Sjkoshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 4495145256Sjkoshy pmc_remove_owner(po); 4496145256Sjkoshy 4497145256Sjkoshy /* send SIGBUS to owner processes */ 4498145256Sjkoshy PMCDBG(MOD,INI,2, "cleanup signal proc=%p " 4499145256Sjkoshy "(%d, %s)", po->po_owner, 4500145256Sjkoshy po->po_owner->p_pid, 4501145256Sjkoshy po->po_owner->p_comm); 4502145256Sjkoshy 4503145256Sjkoshy PROC_LOCK(po->po_owner); 4504145256Sjkoshy psignal(po->po_owner, SIGBUS); 4505145256Sjkoshy PROC_UNLOCK(po->po_owner); 4506147191Sjkoshy 4507147191Sjkoshy pmc_destroy_owner_descriptor(po); 4508145256Sjkoshy } 4509145256Sjkoshy } 4510145256Sjkoshy 4511145256Sjkoshy /* reclaim allocated data structures */ 4512145256Sjkoshy if (pmc_mtxpool) 4513145256Sjkoshy mtx_pool_destroy(&pmc_mtxpool); 4514145256Sjkoshy 4515145256Sjkoshy mtx_destroy(&pmc_processhash_mtx); 4516145256Sjkoshy if (pmc_processhash) { 4517153110Sru#ifdef DEBUG 4518145256Sjkoshy struct pmc_process *pp; 4519145256Sjkoshy 4520145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy process hash"); 4521145256Sjkoshy for (prh = pmc_processhash; 4522145256Sjkoshy prh <= &pmc_processhash[pmc_processhashmask]; 4523145256Sjkoshy prh++) 4524145256Sjkoshy LIST_FOREACH(pp, prh, pp_next) 4525145256Sjkoshy PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 4526145256Sjkoshy#endif 4527145256Sjkoshy 4528145256Sjkoshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 4529145256Sjkoshy pmc_processhash = NULL; 4530145256Sjkoshy } 4531145256Sjkoshy 4532145256Sjkoshy if (pmc_ownerhash) { 4533145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy owner hash"); 4534145256Sjkoshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 4535145256Sjkoshy pmc_ownerhash = NULL; 4536145256Sjkoshy } 4537145256Sjkoshy 4538147191Sjkoshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 4539147191Sjkoshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 4540147191Sjkoshy KASSERT(pmc_ss_count == 0, 4541147191Sjkoshy ("[pmc,%d] Global SS count not empty", __LINE__)); 4542147191Sjkoshy 4543153735Sjkoshy /* free the per-cpu sample buffers */ 4544153735Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4545153735Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4546153735Sjkoshy continue; 4547153735Sjkoshy KASSERT(pmc_pcpu[cpu]->pc_sb != NULL, 4548153735Sjkoshy ("[pmc,%d] Null cpu sample buffer cpu=%d", __LINE__, 4549153735Sjkoshy cpu)); 4550174395Sjkoshy FREE(pmc_pcpu[cpu]->pc_sb->ps_callchains, M_PMC); 4551153735Sjkoshy FREE(pmc_pcpu[cpu]->pc_sb, M_PMC); 4552153735Sjkoshy pmc_pcpu[cpu]->pc_sb = NULL; 4553153735Sjkoshy } 4554153735Sjkoshy 4555145256Sjkoshy /* do processor dependent cleanup */ 4556145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "md cleanup"); 4557145256Sjkoshy if (md) { 4558145256Sjkoshy pmc_save_cpu_binding(&pb); 4559145256Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4560145256Sjkoshy PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 4561145256Sjkoshy cpu, pmc_pcpu[cpu]); 4562145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4563145256Sjkoshy continue; 4564145256Sjkoshy pmc_select_cpu(cpu); 4565145256Sjkoshy if (pmc_pcpu[cpu]) 4566145256Sjkoshy (void) md->pmd_cleanup(cpu); 4567145256Sjkoshy } 4568145256Sjkoshy FREE(md, M_PMC); 4569145256Sjkoshy md = NULL; 4570145256Sjkoshy pmc_restore_cpu_binding(&pb); 4571145256Sjkoshy } 4572145256Sjkoshy 4573145256Sjkoshy /* deallocate per-cpu structures */ 4574145256Sjkoshy FREE(pmc_pcpu, M_PMC); 4575145256Sjkoshy pmc_pcpu = NULL; 4576145256Sjkoshy 4577145256Sjkoshy FREE(pmc_pcpu_saved, M_PMC); 4578145256Sjkoshy pmc_pcpu_saved = NULL; 4579145256Sjkoshy 4580145256Sjkoshy if (pmc_pmcdisp) { 4581145256Sjkoshy FREE(pmc_pmcdisp, M_PMC); 4582145256Sjkoshy pmc_pmcdisp = NULL; 4583145256Sjkoshy } 4584145256Sjkoshy 4585147191Sjkoshy pmclog_shutdown(); 4586147191Sjkoshy 4587145256Sjkoshy sx_xunlock(&pmc_sx); /* we are done */ 4588145256Sjkoshy} 4589145256Sjkoshy 4590145256Sjkoshy/* 4591145256Sjkoshy * The function called at load/unload. 4592145256Sjkoshy */ 4593145256Sjkoshy 4594145256Sjkoshystatic int 4595145256Sjkoshyload (struct module *module __unused, int cmd, void *arg __unused) 4596145256Sjkoshy{ 4597145256Sjkoshy int error; 4598145256Sjkoshy 4599145256Sjkoshy error = 0; 4600145256Sjkoshy 4601145256Sjkoshy switch (cmd) { 4602145256Sjkoshy case MOD_LOAD : 4603145256Sjkoshy /* initialize the subsystem */ 4604145256Sjkoshy error = pmc_initialize(); 4605145256Sjkoshy if (error != 0) 4606145256Sjkoshy break; 4607145256Sjkoshy PMCDBG(MOD,INI,1, "syscall=%d ncpus=%d", 4608145256Sjkoshy pmc_syscall_num, mp_ncpus); 4609145256Sjkoshy break; 4610145256Sjkoshy 4611145256Sjkoshy 4612145256Sjkoshy case MOD_UNLOAD : 4613145256Sjkoshy case MOD_SHUTDOWN: 4614145256Sjkoshy pmc_cleanup(); 4615145256Sjkoshy PMCDBG(MOD,INI,1, "%s", "unloaded"); 4616145256Sjkoshy break; 4617145256Sjkoshy 4618145256Sjkoshy default : 4619145256Sjkoshy error = EINVAL; /* XXX should panic(9) */ 4620145256Sjkoshy break; 4621145256Sjkoshy } 4622145256Sjkoshy 4623145256Sjkoshy return error; 4624145256Sjkoshy} 4625145256Sjkoshy 4626145256Sjkoshy/* memory pool */ 4627145256SjkoshyMALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 4628