hwpmc_mod.c revision 148088
1145256Sjkoshy/*- 2145256Sjkoshy * Copyright (c) 2003-2005 Joseph Koshy 3145256Sjkoshy * All rights reserved. 4145256Sjkoshy * 5145256Sjkoshy * Redistribution and use in source and binary forms, with or without 6145256Sjkoshy * modification, are permitted provided that the following conditions 7145256Sjkoshy * are met: 8145256Sjkoshy * 1. Redistributions of source code must retain the above copyright 9145256Sjkoshy * notice, this list of conditions and the following disclaimer. 10145256Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 11145256Sjkoshy * notice, this list of conditions and the following disclaimer in the 12145256Sjkoshy * documentation and/or other materials provided with the distribution. 13145256Sjkoshy * 14145256Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15145256Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16145256Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17145256Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18145256Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19145256Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20145256Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21145256Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22145256Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23145256Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24145256Sjkoshy * SUCH DAMAGE. 25145256Sjkoshy * 26145256Sjkoshy */ 27145256Sjkoshy 28145256Sjkoshy#include <sys/cdefs.h> 29145256Sjkoshy__FBSDID("$FreeBSD: head/sys/dev/hwpmc/hwpmc_mod.c 148088 2005-07-17 04:18:06Z jkoshy $"); 30145256Sjkoshy 31145256Sjkoshy#include <sys/param.h> 32145256Sjkoshy#include <sys/eventhandler.h> 33145256Sjkoshy#include <sys/jail.h> 34145256Sjkoshy#include <sys/kernel.h> 35147191Sjkoshy#include <sys/kthread.h> 36145256Sjkoshy#include <sys/limits.h> 37145256Sjkoshy#include <sys/lock.h> 38145256Sjkoshy#include <sys/malloc.h> 39145256Sjkoshy#include <sys/module.h> 40145256Sjkoshy#include <sys/mutex.h> 41145256Sjkoshy#include <sys/pmc.h> 42145256Sjkoshy#include <sys/pmckern.h> 43147191Sjkoshy#include <sys/pmclog.h> 44145256Sjkoshy#include <sys/proc.h> 45145256Sjkoshy#include <sys/queue.h> 46147191Sjkoshy#include <sys/resourcevar.h> 47145256Sjkoshy#include <sys/sched.h> 48145256Sjkoshy#include <sys/signalvar.h> 49145256Sjkoshy#include <sys/smp.h> 50145256Sjkoshy#include <sys/sx.h> 51145256Sjkoshy#include <sys/sysctl.h> 52145256Sjkoshy#include <sys/sysent.h> 53145256Sjkoshy#include <sys/systm.h> 54147191Sjkoshy#include <sys/vnode.h> 55145256Sjkoshy 56147191Sjkoshy#include <machine/atomic.h> 57145256Sjkoshy#include <machine/md_var.h> 58145256Sjkoshy 59145256Sjkoshy/* 60145256Sjkoshy * Types 61145256Sjkoshy */ 62145256Sjkoshy 63145256Sjkoshyenum pmc_flags { 64145256Sjkoshy PMC_FLAG_NONE = 0x00, /* do nothing */ 65145256Sjkoshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 66145256Sjkoshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 67145256Sjkoshy}; 68145256Sjkoshy 69145256Sjkoshy/* 70145256Sjkoshy * The offset in sysent where the syscall is allocated. 71145256Sjkoshy */ 72145256Sjkoshy 73145256Sjkoshystatic int pmc_syscall_num = NO_SYSCALL; 74145256Sjkoshystruct pmc_cpu **pmc_pcpu; /* per-cpu state */ 75145256Sjkoshypmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 76145256Sjkoshy 77145256Sjkoshy#define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 78145256Sjkoshy 79145256Sjkoshystruct mtx_pool *pmc_mtxpool; 80145256Sjkoshystatic int *pmc_pmcdisp; /* PMC row dispositions */ 81145256Sjkoshy 82145256Sjkoshy#define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 83145256Sjkoshy#define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 84145256Sjkoshy#define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 85145256Sjkoshy 86145256Sjkoshy#define PMC_MARK_ROW_FREE(R) do { \ 87145256Sjkoshy pmc_pmcdisp[(R)] = 0; \ 88145256Sjkoshy} while (0) 89145256Sjkoshy 90145256Sjkoshy#define PMC_MARK_ROW_STANDALONE(R) do { \ 91145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 92145256Sjkoshy __LINE__)); \ 93145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 94145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= (-mp_ncpus), ("[pmc,%d] row " \ 95145256Sjkoshy "disposition error", __LINE__)); \ 96145256Sjkoshy} while (0) 97145256Sjkoshy 98145256Sjkoshy#define PMC_UNMARK_ROW_STANDALONE(R) do { \ 99145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 100145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 101145256Sjkoshy __LINE__)); \ 102145256Sjkoshy} while (0) 103145256Sjkoshy 104145256Sjkoshy#define PMC_MARK_ROW_THREAD(R) do { \ 105145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 106145256Sjkoshy __LINE__)); \ 107145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 108145256Sjkoshy} while (0) 109145256Sjkoshy 110145256Sjkoshy#define PMC_UNMARK_ROW_THREAD(R) do { \ 111145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 112145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 113145256Sjkoshy __LINE__)); \ 114145256Sjkoshy} while (0) 115145256Sjkoshy 116145256Sjkoshy 117145256Sjkoshy/* various event handlers */ 118145256Sjkoshystatic eventhandler_tag pmc_exit_tag, pmc_fork_tag; 119145256Sjkoshy 120145256Sjkoshy/* Module statistics */ 121145256Sjkoshystruct pmc_op_getdriverstats pmc_stats; 122145256Sjkoshy 123145256Sjkoshy/* Machine/processor dependent operations */ 124145256Sjkoshystruct pmc_mdep *md; 125145256Sjkoshy 126145256Sjkoshy/* 127145256Sjkoshy * Hash tables mapping owner processes and target threads to PMCs. 128145256Sjkoshy */ 129145256Sjkoshy 130145256Sjkoshystruct mtx pmc_processhash_mtx; /* spin mutex */ 131145256Sjkoshystatic u_long pmc_processhashmask; 132145256Sjkoshystatic LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 133145256Sjkoshy 134145256Sjkoshy/* 135145256Sjkoshy * Hash table of PMC owner descriptors. This table is protected by 136145256Sjkoshy * the shared PMC "sx" lock. 137145256Sjkoshy */ 138145256Sjkoshy 139145256Sjkoshystatic u_long pmc_ownerhashmask; 140145256Sjkoshystatic LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 141145256Sjkoshy 142145256Sjkoshy/* 143147191Sjkoshy * List of PMC owners with system-wide sampling PMCs. 144147191Sjkoshy */ 145147191Sjkoshy 146147191Sjkoshystatic LIST_HEAD(, pmc_owner) pmc_ss_owners; 147147191Sjkoshy 148147191Sjkoshy 149147191Sjkoshy/* 150145256Sjkoshy * Prototypes 151145256Sjkoshy */ 152145256Sjkoshy 153145256Sjkoshy#if DEBUG 154145256Sjkoshystatic int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 155145256Sjkoshystatic int pmc_debugflags_parse(char *newstr, char *fence); 156145256Sjkoshy#endif 157145256Sjkoshy 158145256Sjkoshystatic int load(struct module *module, int cmd, void *arg); 159147191Sjkoshystatic int pmc_attach_process(struct proc *p, struct pmc *pm); 160145256Sjkoshystatic struct pmc *pmc_allocate_pmc_descriptor(void); 161147191Sjkoshystatic struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 162147191Sjkoshystatic int pmc_attach_one_process(struct proc *p, struct pmc *pm); 163147191Sjkoshystatic int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 164147191Sjkoshy int cpu); 165147191Sjkoshystatic int pmc_can_attach(struct pmc *pm, struct proc *p); 166147191Sjkoshystatic void pmc_cleanup(void); 167147191Sjkoshystatic int pmc_detach_process(struct proc *p, struct pmc *pm); 168147191Sjkoshystatic int pmc_detach_one_process(struct proc *p, struct pmc *pm, 169147191Sjkoshy int flags); 170147191Sjkoshystatic void pmc_destroy_owner_descriptor(struct pmc_owner *po); 171147191Sjkoshystatic struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 172147191Sjkoshystatic int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 173145256Sjkoshystatic struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 174145256Sjkoshy pmc_id_t pmc); 175145256Sjkoshystatic struct pmc_process *pmc_find_process_descriptor(struct proc *p, 176145256Sjkoshy uint32_t mode); 177145774Sjkoshystatic void pmc_force_context_switch(void); 178145256Sjkoshystatic void pmc_link_target_process(struct pmc *pm, 179145256Sjkoshy struct pmc_process *pp); 180147191Sjkoshystatic void pmc_maybe_remove_owner(struct pmc_owner *po); 181147191Sjkoshystatic void pmc_process_csw_in(struct thread *td); 182147191Sjkoshystatic void pmc_process_csw_out(struct thread *td); 183145256Sjkoshystatic void pmc_process_exit(void *arg, struct proc *p); 184145256Sjkoshystatic void pmc_process_fork(void *arg, struct proc *p1, 185145256Sjkoshy struct proc *p2, int n); 186147191Sjkoshystatic void pmc_process_samples(int cpu); 187147191Sjkoshystatic void pmc_release_pmc_descriptor(struct pmc *pmc); 188147191Sjkoshystatic void pmc_remove_owner(struct pmc_owner *po); 189147191Sjkoshystatic void pmc_remove_process_descriptor(struct pmc_process *pp); 190147191Sjkoshystatic void pmc_restore_cpu_binding(struct pmc_binding *pb); 191147191Sjkoshystatic void pmc_save_cpu_binding(struct pmc_binding *pb); 192147191Sjkoshystatic void pmc_select_cpu(int cpu); 193145256Sjkoshystatic int pmc_start(struct pmc *pm); 194145256Sjkoshystatic int pmc_stop(struct pmc *pm); 195147191Sjkoshystatic int pmc_syscall_handler(struct thread *td, void *syscall_args); 196147191Sjkoshystatic void pmc_unlink_target_process(struct pmc *pmc, 197147191Sjkoshy struct pmc_process *pp); 198145256Sjkoshy 199145256Sjkoshy/* 200145256Sjkoshy * Kernel tunables and sysctl(8) interface. 201145256Sjkoshy */ 202145256Sjkoshy 203145256SjkoshySYSCTL_NODE(_kern, OID_AUTO, hwpmc, CTLFLAG_RW, 0, "HWPMC parameters"); 204145256Sjkoshy 205145256Sjkoshy#if DEBUG 206147191Sjkoshystruct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 207145256Sjkoshychar pmc_debugstr[PMC_DEBUG_STRSIZE]; 208145256SjkoshyTUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 209145256Sjkoshy sizeof(pmc_debugstr)); 210145256SjkoshySYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 211145256Sjkoshy CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN, 212145256Sjkoshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 213145256Sjkoshy#endif 214145256Sjkoshy 215145256Sjkoshy/* 216147191Sjkoshy * kern.hwpmc.hashrows -- determines the number of rows in the 217145256Sjkoshy * of the hash table used to look up threads 218145256Sjkoshy */ 219145256Sjkoshy 220145256Sjkoshystatic int pmc_hashsize = PMC_HASH_SIZE; 221145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize); 222145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD, 223145256Sjkoshy &pmc_hashsize, 0, "rows in hash tables"); 224145256Sjkoshy 225145256Sjkoshy/* 226147191Sjkoshy * kern.hwpmc.nsamples --- number of PC samples per CPU 227145256Sjkoshy */ 228145256Sjkoshy 229147191Sjkoshystatic int pmc_nsamples = PMC_NSAMPLES; 230147191SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nsamples", &pmc_nsamples); 231147191SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_TUN|CTLFLAG_RD, 232147191Sjkoshy &pmc_nsamples, 0, "number of PC samples per CPU"); 233145256Sjkoshy 234145256Sjkoshy/* 235147191Sjkoshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 236145256Sjkoshy */ 237145256Sjkoshy 238145256Sjkoshystatic int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 239145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size); 240145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD, 241145256Sjkoshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 242145256Sjkoshy 243145256Sjkoshy 244145256Sjkoshy/* 245145256Sjkoshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 246145256Sjkoshy * allocate system-wide PMCs. 247145256Sjkoshy * 248145256Sjkoshy * Allowing unprivileged processes to allocate system PMCs is convenient 249145256Sjkoshy * if system-wide measurements need to be taken concurrently with other 250145256Sjkoshy * per-process measurements. This feature is turned off by default. 251145256Sjkoshy */ 252145256Sjkoshy 253145256SjkoshySYSCTL_DECL(_security_bsd); 254145256Sjkoshy 255145256Sjkoshystatic int pmc_unprivileged_syspmcs = 0; 256145256SjkoshyTUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs); 257145256SjkoshySYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW, 258145256Sjkoshy &pmc_unprivileged_syspmcs, 0, 259145256Sjkoshy "allow unprivileged process to allocate system PMCs"); 260145256Sjkoshy 261147191Sjkoshy/* 262147191Sjkoshy * Hash function. Discard the lower 2 bits of the pointer since 263147191Sjkoshy * these are always zero for our uses. The hash multiplier is 264147191Sjkoshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 265147191Sjkoshy */ 266145256Sjkoshy 267145256Sjkoshy#if LONG_BIT == 64 268145256Sjkoshy#define _PMC_HM 11400714819323198486u 269145256Sjkoshy#elif LONG_BIT == 32 270145256Sjkoshy#define _PMC_HM 2654435769u 271145256Sjkoshy#else 272145256Sjkoshy#error Must know the size of 'long' to compile 273145256Sjkoshy#endif 274145256Sjkoshy 275145256Sjkoshy#define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 276145256Sjkoshy 277145256Sjkoshy/* 278145256Sjkoshy * Syscall structures 279145256Sjkoshy */ 280145256Sjkoshy 281145256Sjkoshy/* The `sysent' for the new syscall */ 282145256Sjkoshystatic struct sysent pmc_sysent = { 283145256Sjkoshy 2, /* sy_narg */ 284145256Sjkoshy pmc_syscall_handler /* sy_call */ 285145256Sjkoshy}; 286145256Sjkoshy 287145256Sjkoshystatic struct syscall_module_data pmc_syscall_mod = { 288145256Sjkoshy load, 289145256Sjkoshy NULL, 290145256Sjkoshy &pmc_syscall_num, 291145256Sjkoshy &pmc_sysent, 292145256Sjkoshy { 0, NULL } 293145256Sjkoshy}; 294145256Sjkoshy 295145256Sjkoshystatic moduledata_t pmc_mod = { 296145256Sjkoshy PMC_MODULE_NAME, 297145256Sjkoshy syscall_module_handler, 298145256Sjkoshy &pmc_syscall_mod 299145256Sjkoshy}; 300145256Sjkoshy 301145256SjkoshyDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 302145256SjkoshyMODULE_VERSION(pmc, PMC_VERSION); 303145256Sjkoshy 304145256Sjkoshy#if DEBUG 305147191Sjkoshyenum pmc_dbgparse_state { 306147191Sjkoshy PMCDS_WS, /* in whitespace */ 307147191Sjkoshy PMCDS_MAJOR, /* seen a major keyword */ 308147191Sjkoshy PMCDS_MINOR 309147191Sjkoshy}; 310147191Sjkoshy 311145256Sjkoshystatic int 312145256Sjkoshypmc_debugflags_parse(char *newstr, char *fence) 313145256Sjkoshy{ 314145313Sjkoshy char c, *p, *q; 315147191Sjkoshy struct pmc_debugflags *tmpflags; 316147191Sjkoshy int error, found, *newbits, tmp; 317147191Sjkoshy size_t kwlen; 318145256Sjkoshy 319147191Sjkoshy MALLOC(tmpflags, struct pmc_debugflags *, sizeof(*tmpflags), 320147191Sjkoshy M_PMC, M_WAITOK|M_ZERO); 321145256Sjkoshy 322145256Sjkoshy p = newstr; 323147191Sjkoshy error = 0; 324145256Sjkoshy 325147191Sjkoshy for (; p < fence && (c = *p); p++) { 326145256Sjkoshy 327147191Sjkoshy /* skip white space */ 328147191Sjkoshy if (c == ' ' || c == '\t') 329147191Sjkoshy continue; 330147191Sjkoshy 331147191Sjkoshy /* look for a keyword followed by "=" */ 332147191Sjkoshy for (q = p; p < fence && (c = *p) && c != '='; p++) 333147191Sjkoshy ; 334147191Sjkoshy if (c != '=') { 335147191Sjkoshy error = EINVAL; 336147191Sjkoshy goto done; 337145256Sjkoshy } 338145256Sjkoshy 339147191Sjkoshy kwlen = p - q; 340147191Sjkoshy newbits = NULL; 341145256Sjkoshy 342147191Sjkoshy /* lookup flag group name */ 343147191Sjkoshy#define DBG_SET_FLAG_MAJ(S,F) \ 344147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 345147191Sjkoshy newbits = &tmpflags->pdb_ ## F; 346145256Sjkoshy 347147191Sjkoshy DBG_SET_FLAG_MAJ("cpu", CPU); 348147191Sjkoshy DBG_SET_FLAG_MAJ("csw", CSW); 349147191Sjkoshy DBG_SET_FLAG_MAJ("logging", LOG); 350147191Sjkoshy DBG_SET_FLAG_MAJ("module", MOD); 351147191Sjkoshy DBG_SET_FLAG_MAJ("md", MDP); 352147191Sjkoshy DBG_SET_FLAG_MAJ("owner", OWN); 353147191Sjkoshy DBG_SET_FLAG_MAJ("pmc", PMC); 354147191Sjkoshy DBG_SET_FLAG_MAJ("process", PRC); 355147191Sjkoshy DBG_SET_FLAG_MAJ("sampling", SAM); 356145256Sjkoshy 357147191Sjkoshy if (newbits == NULL) { 358147191Sjkoshy error = EINVAL; 359147191Sjkoshy goto done; 360145256Sjkoshy } 361145256Sjkoshy 362147191Sjkoshy p++; /* skip the '=' */ 363145256Sjkoshy 364147191Sjkoshy /* Now parse the individual flags */ 365147191Sjkoshy tmp = 0; 366147191Sjkoshy newflag: 367147191Sjkoshy for (q = p; p < fence && (c = *p); p++) 368147191Sjkoshy if (c == ' ' || c == '\t' || c == ',') 369147191Sjkoshy break; 370147191Sjkoshy 371147191Sjkoshy /* p == fence or c == ws or c == "," or c == 0 */ 372147191Sjkoshy 373147191Sjkoshy if ((kwlen = p - q) == 0) { 374147191Sjkoshy *newbits = tmp; 375147191Sjkoshy continue; 376147191Sjkoshy } 377147191Sjkoshy 378147191Sjkoshy found = 0; 379147191Sjkoshy#define DBG_SET_FLAG_MIN(S,F) \ 380147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 381147191Sjkoshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 382147191Sjkoshy 383147191Sjkoshy /* a '*' denotes all possible flags in the group */ 384147191Sjkoshy if (kwlen == 1 && *q == '*') 385147191Sjkoshy tmp = found = ~0; 386147191Sjkoshy /* look for individual flag names */ 387147191Sjkoshy DBG_SET_FLAG_MIN("allocaterow", ALR); 388147191Sjkoshy DBG_SET_FLAG_MIN("allocate", ALL); 389147191Sjkoshy DBG_SET_FLAG_MIN("attach", ATT); 390147191Sjkoshy DBG_SET_FLAG_MIN("bind", BND); 391147191Sjkoshy DBG_SET_FLAG_MIN("config", CFG); 392147191Sjkoshy DBG_SET_FLAG_MIN("exec", EXC); 393147191Sjkoshy DBG_SET_FLAG_MIN("exit", EXT); 394147191Sjkoshy DBG_SET_FLAG_MIN("find", FND); 395147191Sjkoshy DBG_SET_FLAG_MIN("flush", FLS); 396147191Sjkoshy DBG_SET_FLAG_MIN("fork", FRK); 397147191Sjkoshy DBG_SET_FLAG_MIN("getbuf", GTB); 398147191Sjkoshy DBG_SET_FLAG_MIN("hook", PMH); 399147191Sjkoshy DBG_SET_FLAG_MIN("init", INI); 400147191Sjkoshy DBG_SET_FLAG_MIN("intr", INT); 401147191Sjkoshy DBG_SET_FLAG_MIN("linktarget", TLK); 402147191Sjkoshy DBG_SET_FLAG_MIN("mayberemove", OMR); 403147191Sjkoshy DBG_SET_FLAG_MIN("ops", OPS); 404147191Sjkoshy DBG_SET_FLAG_MIN("read", REA); 405147191Sjkoshy DBG_SET_FLAG_MIN("register", REG); 406147191Sjkoshy DBG_SET_FLAG_MIN("release", REL); 407147191Sjkoshy DBG_SET_FLAG_MIN("remove", ORM); 408147191Sjkoshy DBG_SET_FLAG_MIN("sample", SAM); 409147191Sjkoshy DBG_SET_FLAG_MIN("scheduleio", SIO); 410147191Sjkoshy DBG_SET_FLAG_MIN("select", SEL); 411147191Sjkoshy DBG_SET_FLAG_MIN("signal", SIG); 412147191Sjkoshy DBG_SET_FLAG_MIN("swi", SWI); 413147191Sjkoshy DBG_SET_FLAG_MIN("swo", SWO); 414147191Sjkoshy DBG_SET_FLAG_MIN("start", STA); 415147191Sjkoshy DBG_SET_FLAG_MIN("stop", STO); 416147191Sjkoshy DBG_SET_FLAG_MIN("syscall", PMS); 417147191Sjkoshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 418147191Sjkoshy DBG_SET_FLAG_MIN("write", WRI); 419147191Sjkoshy if (found == 0) { 420147191Sjkoshy /* unrecognized flag name */ 421147191Sjkoshy error = EINVAL; 422147191Sjkoshy goto done; 423147191Sjkoshy } 424147191Sjkoshy 425147191Sjkoshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 426147191Sjkoshy *newbits = tmp; 427147191Sjkoshy continue; 428147191Sjkoshy } 429147191Sjkoshy 430147191Sjkoshy p++; 431147191Sjkoshy goto newflag; 432145256Sjkoshy } 433145256Sjkoshy 434147191Sjkoshy /* save the new flag set */ 435147191Sjkoshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 436145256Sjkoshy 437147191Sjkoshy done: 438147191Sjkoshy FREE(tmpflags, M_PMC); 439147191Sjkoshy return error; 440145256Sjkoshy} 441145256Sjkoshy 442145256Sjkoshystatic int 443145256Sjkoshypmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 444145256Sjkoshy{ 445145256Sjkoshy char *fence, *newstr; 446145256Sjkoshy int error; 447145256Sjkoshy unsigned int n; 448145256Sjkoshy 449145256Sjkoshy (void) arg1; (void) arg2; /* unused parameters */ 450145256Sjkoshy 451145256Sjkoshy n = sizeof(pmc_debugstr); 452145256Sjkoshy MALLOC(newstr, char *, n, M_PMC, M_ZERO|M_WAITOK); 453147191Sjkoshy (void) strlcpy(newstr, pmc_debugstr, n); 454145256Sjkoshy 455145256Sjkoshy error = sysctl_handle_string(oidp, newstr, n, req); 456145256Sjkoshy 457145256Sjkoshy /* if there is a new string, parse and copy it */ 458145256Sjkoshy if (error == 0 && req->newptr != NULL) { 459147191Sjkoshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 460145256Sjkoshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 461145256Sjkoshy (void) strlcpy(pmc_debugstr, newstr, 462145256Sjkoshy sizeof(pmc_debugstr)); 463145256Sjkoshy } 464145256Sjkoshy 465145256Sjkoshy FREE(newstr, M_PMC); 466145256Sjkoshy 467145256Sjkoshy return error; 468145256Sjkoshy} 469145256Sjkoshy#endif 470145256Sjkoshy 471145256Sjkoshy/* 472145256Sjkoshy * Concurrency Control 473145256Sjkoshy * 474145256Sjkoshy * The driver manages the following data structures: 475145256Sjkoshy * 476145256Sjkoshy * - target process descriptors, one per target process 477145256Sjkoshy * - owner process descriptors (and attached lists), one per owner process 478145256Sjkoshy * - lookup hash tables for owner and target processes 479145256Sjkoshy * - PMC descriptors (and attached lists) 480145256Sjkoshy * - per-cpu hardware state 481145256Sjkoshy * - the 'hook' variable through which the kernel calls into 482145256Sjkoshy * this module 483145256Sjkoshy * - the machine hardware state (managed by the MD layer) 484145256Sjkoshy * 485145256Sjkoshy * These data structures are accessed from: 486145256Sjkoshy * 487145256Sjkoshy * - thread context-switch code 488145256Sjkoshy * - interrupt handlers (possibly on multiple cpus) 489145256Sjkoshy * - kernel threads on multiple cpus running on behalf of user 490145256Sjkoshy * processes doing system calls 491145256Sjkoshy * - this driver's private kernel threads 492145256Sjkoshy * 493145256Sjkoshy * = Locks and Locking strategy = 494145256Sjkoshy * 495145256Sjkoshy * The driver uses four locking strategies for its operation: 496145256Sjkoshy * 497145256Sjkoshy * - There is a 'global' SX lock "pmc_sx" that is used to protect 498145256Sjkoshy * the its 'meta-data'. 499145256Sjkoshy * 500145256Sjkoshy * Calls into the module (via syscall() or by the kernel) start with 501145256Sjkoshy * this lock being held in exclusive mode. Depending on the requested 502145256Sjkoshy * operation, the lock may be downgraded to 'shared' mode to allow 503145256Sjkoshy * more concurrent readers into the module. 504145256Sjkoshy * 505145256Sjkoshy * This SX lock is held in exclusive mode for any operations that 506145256Sjkoshy * modify the linkages between the driver's internal data structures. 507145256Sjkoshy * 508145256Sjkoshy * The 'pmc_hook' function pointer is also protected by this lock. 509145256Sjkoshy * It is only examined with the sx lock held in exclusive mode. The 510145256Sjkoshy * kernel module is allowed to be unloaded only with the sx lock 511145256Sjkoshy * held in exclusive mode. In normal syscall handling, after 512145256Sjkoshy * acquiring the pmc_sx lock we first check that 'pmc_hook' is 513145256Sjkoshy * non-null before proceeding. This prevents races between the 514145256Sjkoshy * thread unloading the module and other threads seeking to use the 515145256Sjkoshy * module. 516145256Sjkoshy * 517145256Sjkoshy * - Lookups of target process structures and owner process structures 518145256Sjkoshy * cannot use the global "pmc_sx" SX lock because these lookups need 519145256Sjkoshy * to happen during context switches and in other critical sections 520145256Sjkoshy * where sleeping is not allowed. We protect these lookup tables 521145256Sjkoshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 522145256Sjkoshy * "pmc_ownerhash_mtx". These are 'leaf' mutexes, in that no other 523145256Sjkoshy * lock is acquired with these locks held. 524145256Sjkoshy * 525145256Sjkoshy * - Interrupt handlers work in a lock free manner. At interrupt 526145256Sjkoshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 527145256Sjkoshy * when the PMC was started. If this pointer is NULL, the interrupt 528145256Sjkoshy * is ignored after updating driver statistics. We ensure that this 529145256Sjkoshy * pointer is set (using an atomic operation if necessary) before the 530145256Sjkoshy * PMC hardware is started. Conversely, this pointer is unset atomically 531145256Sjkoshy * only after the PMC hardware is stopped. 532145256Sjkoshy * 533145256Sjkoshy * We ensure that everything needed for the operation of an 534145256Sjkoshy * interrupt handler is available without it needing to acquire any 535145256Sjkoshy * locks. We also ensure that a PMC's software state is destroyed only 536145256Sjkoshy * after the PMC is taken off hardware (on all CPUs). 537145256Sjkoshy * 538145256Sjkoshy * - Context-switch handling with process-private PMCs needs more 539145256Sjkoshy * care. 540145256Sjkoshy * 541145256Sjkoshy * A given process may be the target of multiple PMCs. For example, 542145256Sjkoshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 543145256Sjkoshy * while the target process is running on another. A PMC could also 544145256Sjkoshy * be getting released because its owner is exiting. We tackle 545145256Sjkoshy * these situations in the following manner: 546145256Sjkoshy * 547145256Sjkoshy * - each target process structure 'pmc_process' has an array 548145256Sjkoshy * of 'struct pmc *' pointers, one for each hardware PMC. 549145256Sjkoshy * 550145256Sjkoshy * - At context switch IN time, each "target" PMC in RUNNING state 551145256Sjkoshy * gets started on hardware and a pointer to each PMC is copied into 552145256Sjkoshy * the per-cpu phw array. The 'runcount' for the PMC is 553145256Sjkoshy * incremented. 554145256Sjkoshy * 555145256Sjkoshy * - At context switch OUT time, all process-virtual PMCs are stopped 556145256Sjkoshy * on hardware. The saved value is added to the PMCs value field 557145256Sjkoshy * only if the PMC is in a non-deleted state (the PMCs state could 558145256Sjkoshy * have changed during the current time slice). 559145256Sjkoshy * 560145256Sjkoshy * Note that since in-between a switch IN on a processor and a switch 561145256Sjkoshy * OUT, the PMC could have been released on another CPU. Therefore 562145256Sjkoshy * context switch OUT always looks at the hardware state to turn 563145256Sjkoshy * OFF PMCs and will update a PMC's saved value only if reachable 564145256Sjkoshy * from the target process record. 565145256Sjkoshy * 566145256Sjkoshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 567145256Sjkoshy * be attached to many processes at the time of the call and could 568145256Sjkoshy * be active on multiple CPUs). 569145256Sjkoshy * 570145256Sjkoshy * We prevent further scheduling of the PMC by marking it as in 571145256Sjkoshy * state 'DELETED'. If the runcount of the PMC is non-zero then 572145256Sjkoshy * this PMC is currently running on a CPU somewhere. The thread 573145256Sjkoshy * doing the PMCRELEASE operation waits by repeatedly doing an 574145256Sjkoshy * tsleep() till the runcount comes to zero. 575145256Sjkoshy * 576145256Sjkoshy */ 577145256Sjkoshy 578145256Sjkoshy/* 579145256Sjkoshy * save the cpu binding of the current kthread 580145256Sjkoshy */ 581145256Sjkoshy 582145256Sjkoshystatic void 583145256Sjkoshypmc_save_cpu_binding(struct pmc_binding *pb) 584145256Sjkoshy{ 585145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "save-cpu"); 586145256Sjkoshy mtx_lock_spin(&sched_lock); 587145256Sjkoshy pb->pb_bound = sched_is_bound(curthread); 588145256Sjkoshy pb->pb_cpu = curthread->td_oncpu; 589145256Sjkoshy mtx_unlock_spin(&sched_lock); 590145256Sjkoshy PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 591145256Sjkoshy} 592145256Sjkoshy 593145256Sjkoshy/* 594145256Sjkoshy * restore the cpu binding of the current thread 595145256Sjkoshy */ 596145256Sjkoshy 597145256Sjkoshystatic void 598145256Sjkoshypmc_restore_cpu_binding(struct pmc_binding *pb) 599145256Sjkoshy{ 600145256Sjkoshy PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 601145256Sjkoshy curthread->td_oncpu, pb->pb_cpu); 602145256Sjkoshy mtx_lock_spin(&sched_lock); 603145256Sjkoshy if (pb->pb_bound) 604145256Sjkoshy sched_bind(curthread, pb->pb_cpu); 605145256Sjkoshy else 606145256Sjkoshy sched_unbind(curthread); 607145256Sjkoshy mtx_unlock_spin(&sched_lock); 608145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "restore-cpu done"); 609145256Sjkoshy} 610145256Sjkoshy 611145256Sjkoshy/* 612145256Sjkoshy * move execution over the specified cpu and bind it there. 613145256Sjkoshy */ 614145256Sjkoshy 615145256Sjkoshystatic void 616145256Sjkoshypmc_select_cpu(int cpu) 617145256Sjkoshy{ 618145256Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 619145256Sjkoshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 620145256Sjkoshy 621145256Sjkoshy /* never move to a disabled CPU */ 622145256Sjkoshy KASSERT(pmc_cpu_is_disabled(cpu) == 0, ("[pmc,%d] selecting " 623145256Sjkoshy "disabled CPU %d", __LINE__, cpu)); 624145256Sjkoshy 625145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu); 626145256Sjkoshy mtx_lock_spin(&sched_lock); 627145256Sjkoshy sched_bind(curthread, cpu); 628145256Sjkoshy mtx_unlock_spin(&sched_lock); 629145256Sjkoshy 630145256Sjkoshy KASSERT(curthread->td_oncpu == cpu, 631145256Sjkoshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 632145256Sjkoshy cpu, curthread->td_oncpu)); 633145256Sjkoshy 634145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 635145256Sjkoshy} 636145256Sjkoshy 637145256Sjkoshy/* 638145774Sjkoshy * Force a context switch. 639145774Sjkoshy * 640145774Sjkoshy * We do this by tsleep'ing for 1 tick -- invoking mi_switch() is not 641145774Sjkoshy * guaranteed to force a context switch. 642145774Sjkoshy */ 643145774Sjkoshy 644145774Sjkoshystatic void 645145774Sjkoshypmc_force_context_switch(void) 646145774Sjkoshy{ 647145774Sjkoshy u_char curpri; 648145774Sjkoshy 649145774Sjkoshy mtx_lock_spin(&sched_lock); 650145774Sjkoshy curpri = curthread->td_priority; 651145774Sjkoshy mtx_unlock_spin(&sched_lock); 652145774Sjkoshy 653145774Sjkoshy (void) tsleep((void *) pmc_force_context_switch, curpri, 654145774Sjkoshy "pmcctx", 1); 655145774Sjkoshy 656145774Sjkoshy} 657145774Sjkoshy 658145774Sjkoshy/* 659147191Sjkoshy * Get the file name for an executable. This is a simple wrapper 660147191Sjkoshy * around vn_fullpath(9). 661145256Sjkoshy */ 662145256Sjkoshy 663147191Sjkoshystatic void 664147708Sjkoshypmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 665145256Sjkoshy{ 666145256Sjkoshy struct thread *td; 667145256Sjkoshy 668147191Sjkoshy td = curthread; 669147191Sjkoshy *fullpath = "unknown"; 670147191Sjkoshy *freepath = NULL; 671148088Sjkoshy vn_lock(v, LK_CANRECURSE | LK_EXCLUSIVE | LK_RETRY, td); 672147708Sjkoshy vn_fullpath(td, v, fullpath, freepath); 673147708Sjkoshy VOP_UNLOCK(v, 0, td); 674145256Sjkoshy} 675145256Sjkoshy 676145256Sjkoshy/* 677145256Sjkoshy * remove an process owning PMCs 678145256Sjkoshy */ 679145256Sjkoshy 680145256Sjkoshyvoid 681145256Sjkoshypmc_remove_owner(struct pmc_owner *po) 682145256Sjkoshy{ 683147191Sjkoshy struct pmc *pm, *tmp; 684145256Sjkoshy 685145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 686145256Sjkoshy 687145256Sjkoshy PMCDBG(OWN,ORM,1, "remove-owner po=%p", po); 688145256Sjkoshy 689145256Sjkoshy /* Remove descriptor from the owner hash table */ 690145256Sjkoshy LIST_REMOVE(po, po_next); 691145256Sjkoshy 692147191Sjkoshy /* release all owned PMC descriptors */ 693147191Sjkoshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 694147191Sjkoshy PMCDBG(OWN,ORM,2, "pmc=%p", pm); 695147191Sjkoshy KASSERT(pm->pm_owner == po, 696147191Sjkoshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 697145256Sjkoshy 698147191Sjkoshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 699145256Sjkoshy } 700145256Sjkoshy 701147191Sjkoshy KASSERT(po->po_sscount == 0, 702147191Sjkoshy ("[pmc,%d] SS count not zero", __LINE__)); 703145256Sjkoshy KASSERT(LIST_EMPTY(&po->po_pmcs), 704147191Sjkoshy ("[pmc,%d] PMC list not empty", __LINE__)); 705145256Sjkoshy 706147191Sjkoshy /* de-configure the log file if present */ 707145774Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 708147191Sjkoshy pmclog_deconfigure_log(po); 709145256Sjkoshy} 710145256Sjkoshy 711145256Sjkoshy/* 712145256Sjkoshy * remove an owner process record if all conditions are met. 713145256Sjkoshy */ 714145256Sjkoshy 715145256Sjkoshystatic void 716145256Sjkoshypmc_maybe_remove_owner(struct pmc_owner *po) 717145256Sjkoshy{ 718145256Sjkoshy 719145256Sjkoshy PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po); 720145256Sjkoshy 721145256Sjkoshy /* 722145256Sjkoshy * Remove owner record if 723145256Sjkoshy * - this process does not own any PMCs 724145256Sjkoshy * - this process has not allocated a system-wide sampling buffer 725145256Sjkoshy */ 726145256Sjkoshy 727145256Sjkoshy if (LIST_EMPTY(&po->po_pmcs) && 728145774Sjkoshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 729145256Sjkoshy pmc_remove_owner(po); 730147191Sjkoshy pmc_destroy_owner_descriptor(po); 731145256Sjkoshy } 732145256Sjkoshy} 733145256Sjkoshy 734145256Sjkoshy/* 735145256Sjkoshy * Add an association between a target process and a PMC. 736145256Sjkoshy */ 737145256Sjkoshy 738145256Sjkoshystatic void 739145256Sjkoshypmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 740145256Sjkoshy{ 741145256Sjkoshy int ri; 742145256Sjkoshy struct pmc_target *pt; 743145256Sjkoshy 744145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 745145256Sjkoshy 746145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 747145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 748147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 749147191Sjkoshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 750147191Sjkoshy __LINE__, pm, pp->pp_proc->p_pid)); 751145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < ((int) md->pmd_npmc - 1), 752145256Sjkoshy ("[pmc,%d] Illegal reference count %d for process record %p", 753145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 754145256Sjkoshy 755145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 756145256Sjkoshy 757145256Sjkoshy PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 758145256Sjkoshy pm, ri, pp); 759145256Sjkoshy 760145256Sjkoshy#if DEBUG 761145256Sjkoshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 762145256Sjkoshy if (pt->pt_process == pp) 763145256Sjkoshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 764145256Sjkoshy __LINE__, pp, pm)); 765145256Sjkoshy#endif 766145256Sjkoshy 767145256Sjkoshy MALLOC(pt, struct pmc_target *, sizeof(struct pmc_target), 768145256Sjkoshy M_PMC, M_ZERO|M_WAITOK); 769145256Sjkoshy 770145256Sjkoshy pt->pt_process = pp; 771145256Sjkoshy 772145256Sjkoshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 773145256Sjkoshy 774148067Sjhb atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 775148067Sjhb (uintptr_t)pm); 776145256Sjkoshy 777145615Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) 778145774Sjkoshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 779145615Sjkoshy 780147191Sjkoshy /* 781147191Sjkoshy * Initialize the per-process values at this row index. 782147191Sjkoshy */ 783147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 784147191Sjkoshy pm->pm_sc.pm_reloadcount : 0; 785147191Sjkoshy 786145256Sjkoshy pp->pp_refcnt++; 787145256Sjkoshy 788145256Sjkoshy} 789145256Sjkoshy 790145256Sjkoshy/* 791145256Sjkoshy * Removes the association between a target process and a PMC. 792145256Sjkoshy */ 793145256Sjkoshy 794145256Sjkoshystatic void 795145256Sjkoshypmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 796145256Sjkoshy{ 797145256Sjkoshy int ri; 798147191Sjkoshy struct proc *p; 799145256Sjkoshy struct pmc_target *ptgt; 800145256Sjkoshy 801145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 802145256Sjkoshy 803145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 804145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 805145256Sjkoshy 806145256Sjkoshy KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt < (int) md->pmd_npmc, 807145256Sjkoshy ("[pmc,%d] Illegal ref count %d on process record %p", 808145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 809145256Sjkoshy 810145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 811145256Sjkoshy 812145256Sjkoshy PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 813145256Sjkoshy pm, ri, pp); 814145256Sjkoshy 815145256Sjkoshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 816145256Sjkoshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 817145256Sjkoshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 818145256Sjkoshy 819145256Sjkoshy pp->pp_pmcs[ri].pp_pmc = NULL; 820145256Sjkoshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 821145256Sjkoshy 822145774Sjkoshy /* Remove owner-specific flags */ 823145774Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) { 824145774Sjkoshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 825145774Sjkoshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 826145774Sjkoshy } 827145615Sjkoshy 828145256Sjkoshy pp->pp_refcnt--; 829145256Sjkoshy 830145256Sjkoshy /* Remove the target process from the PMC structure */ 831145256Sjkoshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 832145256Sjkoshy if (ptgt->pt_process == pp) 833145256Sjkoshy break; 834145256Sjkoshy 835145256Sjkoshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 836145256Sjkoshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 837145256Sjkoshy 838145256Sjkoshy LIST_REMOVE(ptgt, pt_next); 839145256Sjkoshy FREE(ptgt, M_PMC); 840145256Sjkoshy 841147191Sjkoshy /* if the PMC now lacks targets, send the owner a SIGIO */ 842147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) { 843147191Sjkoshy p = pm->pm_owner->po_owner; 844147191Sjkoshy PROC_LOCK(p); 845147191Sjkoshy psignal(p, SIGIO); 846147191Sjkoshy PROC_UNLOCK(p); 847145256Sjkoshy 848147191Sjkoshy PMCDBG(PRC,SIG,2, "signalling proc=%p signal=%d", p, 849147191Sjkoshy SIGIO); 850145256Sjkoshy } 851145256Sjkoshy} 852145256Sjkoshy 853145256Sjkoshy/* 854145256Sjkoshy * Check if PMC 'pm' may be attached to target process 't'. 855145256Sjkoshy */ 856145256Sjkoshy 857145256Sjkoshystatic int 858145256Sjkoshypmc_can_attach(struct pmc *pm, struct proc *t) 859145256Sjkoshy{ 860145256Sjkoshy struct proc *o; /* pmc owner */ 861145256Sjkoshy struct ucred *oc, *tc; /* owner, target credentials */ 862145256Sjkoshy int decline_attach, i; 863145256Sjkoshy 864145256Sjkoshy /* 865145256Sjkoshy * A PMC's owner can always attach that PMC to itself. 866145256Sjkoshy */ 867145256Sjkoshy 868145256Sjkoshy if ((o = pm->pm_owner->po_owner) == t) 869145256Sjkoshy return 0; 870145256Sjkoshy 871145256Sjkoshy PROC_LOCK(o); 872145256Sjkoshy oc = o->p_ucred; 873145256Sjkoshy crhold(oc); 874145256Sjkoshy PROC_UNLOCK(o); 875145256Sjkoshy 876145256Sjkoshy PROC_LOCK(t); 877145256Sjkoshy tc = t->p_ucred; 878145256Sjkoshy crhold(tc); 879145256Sjkoshy PROC_UNLOCK(t); 880145256Sjkoshy 881145256Sjkoshy /* 882145256Sjkoshy * The effective uid of the PMC owner should match at least one 883145256Sjkoshy * of the {effective,real,saved} uids of the target process. 884145256Sjkoshy */ 885145256Sjkoshy 886145256Sjkoshy decline_attach = oc->cr_uid != tc->cr_uid && 887145256Sjkoshy oc->cr_uid != tc->cr_svuid && 888145256Sjkoshy oc->cr_uid != tc->cr_ruid; 889145256Sjkoshy 890145256Sjkoshy /* 891145256Sjkoshy * Every one of the target's group ids, must be in the owner's 892145256Sjkoshy * group list. 893145256Sjkoshy */ 894145256Sjkoshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 895145256Sjkoshy decline_attach = !groupmember(tc->cr_groups[i], oc); 896145256Sjkoshy 897145256Sjkoshy /* check the read and saved gids too */ 898145256Sjkoshy if (decline_attach == 0) 899145256Sjkoshy decline_attach = !groupmember(tc->cr_rgid, oc) || 900145256Sjkoshy !groupmember(tc->cr_svgid, oc); 901145256Sjkoshy 902145256Sjkoshy crfree(tc); 903145256Sjkoshy crfree(oc); 904145256Sjkoshy 905145256Sjkoshy return !decline_attach; 906145256Sjkoshy} 907145256Sjkoshy 908145256Sjkoshy/* 909145256Sjkoshy * Attach a process to a PMC. 910145256Sjkoshy */ 911145256Sjkoshy 912145256Sjkoshystatic int 913145256Sjkoshypmc_attach_one_process(struct proc *p, struct pmc *pm) 914145256Sjkoshy{ 915145256Sjkoshy int ri; 916147191Sjkoshy char *fullpath, *freepath; 917145256Sjkoshy struct pmc_process *pp; 918145256Sjkoshy 919145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 920145256Sjkoshy 921145256Sjkoshy PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 922145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 923145256Sjkoshy 924145256Sjkoshy /* 925145256Sjkoshy * Locate the process descriptor corresponding to process 'p', 926145256Sjkoshy * allocating space as needed. 927145256Sjkoshy * 928145256Sjkoshy * Verify that rowindex 'pm_rowindex' is free in the process 929145256Sjkoshy * descriptor. 930145256Sjkoshy * 931145256Sjkoshy * If not, allocate space for a descriptor and link the 932145256Sjkoshy * process descriptor and PMC. 933145256Sjkoshy */ 934145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 935145256Sjkoshy 936145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 937145256Sjkoshy return ENOMEM; 938145256Sjkoshy 939145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 940145256Sjkoshy return EEXIST; 941145256Sjkoshy 942145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 943145256Sjkoshy return EBUSY; 944145256Sjkoshy 945145256Sjkoshy pmc_link_target_process(pm, pp); 946145256Sjkoshy 947147191Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 948147191Sjkoshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 949147191Sjkoshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 950147191Sjkoshy 951147191Sjkoshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 952147191Sjkoshy 953147191Sjkoshy /* issue an attach event to a configured log file */ 954147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 955147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 956147191Sjkoshy pmclog_process_pmcattach(pm, p->p_pid, fullpath); 957147191Sjkoshy if (freepath) 958147191Sjkoshy FREE(freepath, M_TEMP); 959147191Sjkoshy } 960145256Sjkoshy /* mark process as using HWPMCs */ 961145256Sjkoshy PROC_LOCK(p); 962145256Sjkoshy p->p_flag |= P_HWPMC; 963145256Sjkoshy PROC_UNLOCK(p); 964145256Sjkoshy 965145256Sjkoshy return 0; 966145256Sjkoshy} 967145256Sjkoshy 968145256Sjkoshy/* 969145256Sjkoshy * Attach a process and optionally its children 970145256Sjkoshy */ 971145256Sjkoshy 972145256Sjkoshystatic int 973145256Sjkoshypmc_attach_process(struct proc *p, struct pmc *pm) 974145256Sjkoshy{ 975145256Sjkoshy int error; 976145256Sjkoshy struct proc *top; 977145256Sjkoshy 978145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 979145256Sjkoshy 980145256Sjkoshy PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 981145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 982145256Sjkoshy 983145774Sjkoshy 984145774Sjkoshy /* 985145774Sjkoshy * If this PMC successfully allowed a GETMSR operation 986145774Sjkoshy * in the past, disallow further ATTACHes. 987145774Sjkoshy */ 988145774Sjkoshy 989145774Sjkoshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 990145774Sjkoshy return EPERM; 991145774Sjkoshy 992145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 993145256Sjkoshy return pmc_attach_one_process(p, pm); 994145256Sjkoshy 995145256Sjkoshy /* 996145256Sjkoshy * Traverse all child processes, attaching them to 997145256Sjkoshy * this PMC. 998145256Sjkoshy */ 999145256Sjkoshy 1000145256Sjkoshy sx_slock(&proctree_lock); 1001145256Sjkoshy 1002145256Sjkoshy top = p; 1003145256Sjkoshy 1004145256Sjkoshy for (;;) { 1005145256Sjkoshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1006145256Sjkoshy break; 1007145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1008145256Sjkoshy p = LIST_FIRST(&p->p_children); 1009145256Sjkoshy else for (;;) { 1010145256Sjkoshy if (p == top) 1011145256Sjkoshy goto done; 1012145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1013145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1014145256Sjkoshy break; 1015145256Sjkoshy } 1016145256Sjkoshy p = p->p_pptr; 1017145256Sjkoshy } 1018145256Sjkoshy } 1019145256Sjkoshy 1020145256Sjkoshy if (error) 1021145256Sjkoshy (void) pmc_detach_process(top, pm); 1022145256Sjkoshy 1023145256Sjkoshy done: 1024145256Sjkoshy sx_sunlock(&proctree_lock); 1025145256Sjkoshy return error; 1026145256Sjkoshy} 1027145256Sjkoshy 1028145256Sjkoshy/* 1029145256Sjkoshy * Detach a process from a PMC. If there are no other PMCs tracking 1030145256Sjkoshy * this process, remove the process structure from its hash table. If 1031145256Sjkoshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1032145256Sjkoshy */ 1033145256Sjkoshy 1034145256Sjkoshystatic int 1035145256Sjkoshypmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1036145256Sjkoshy{ 1037145256Sjkoshy int ri; 1038145256Sjkoshy struct pmc_process *pp; 1039145256Sjkoshy 1040145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1041145256Sjkoshy 1042145256Sjkoshy KASSERT(pm != NULL, 1043145256Sjkoshy ("[pmc,%d] null pm pointer", __LINE__)); 1044145256Sjkoshy 1045145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1046145774Sjkoshy 1047145256Sjkoshy PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1048145774Sjkoshy pm, ri, p, p->p_pid, p->p_comm, flags); 1049145256Sjkoshy 1050145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1051145256Sjkoshy return ESRCH; 1052145256Sjkoshy 1053145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1054145256Sjkoshy return EINVAL; 1055145256Sjkoshy 1056145256Sjkoshy pmc_unlink_target_process(pm, pp); 1057145256Sjkoshy 1058147191Sjkoshy /* Issue a detach entry if a log file is configured */ 1059147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1060147191Sjkoshy pmclog_process_pmcdetach(pm, p->p_pid); 1061147191Sjkoshy 1062145256Sjkoshy /* 1063145256Sjkoshy * If there are no PMCs targetting this process, we remove its 1064145256Sjkoshy * descriptor from the target hash table and unset the P_HWPMC 1065145256Sjkoshy * flag in the struct proc. 1066145256Sjkoshy */ 1067145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1068145256Sjkoshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1069145256Sjkoshy __LINE__, pp->pp_refcnt, pp)); 1070145256Sjkoshy 1071145256Sjkoshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1072145256Sjkoshy return 0; 1073145256Sjkoshy 1074145256Sjkoshy pmc_remove_process_descriptor(pp); 1075145256Sjkoshy 1076145256Sjkoshy if (flags & PMC_FLAG_REMOVE) 1077145256Sjkoshy FREE(pp, M_PMC); 1078145256Sjkoshy 1079145256Sjkoshy PROC_LOCK(p); 1080145256Sjkoshy p->p_flag &= ~P_HWPMC; 1081145256Sjkoshy PROC_UNLOCK(p); 1082145256Sjkoshy 1083145256Sjkoshy return 0; 1084145256Sjkoshy} 1085145256Sjkoshy 1086145256Sjkoshy/* 1087145256Sjkoshy * Detach a process and optionally its descendants from a PMC. 1088145256Sjkoshy */ 1089145256Sjkoshy 1090145256Sjkoshystatic int 1091145256Sjkoshypmc_detach_process(struct proc *p, struct pmc *pm) 1092145256Sjkoshy{ 1093145256Sjkoshy struct proc *top; 1094145256Sjkoshy 1095145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1096145256Sjkoshy 1097145256Sjkoshy PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1098145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1099145256Sjkoshy 1100145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1101145256Sjkoshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1102145256Sjkoshy 1103145256Sjkoshy /* 1104145256Sjkoshy * Traverse all children, detaching them from this PMC. We 1105145256Sjkoshy * ignore errors since we could be detaching a PMC from a 1106145256Sjkoshy * partially attached proc tree. 1107145256Sjkoshy */ 1108145256Sjkoshy 1109145256Sjkoshy sx_slock(&proctree_lock); 1110145256Sjkoshy 1111145256Sjkoshy top = p; 1112145256Sjkoshy 1113145256Sjkoshy for (;;) { 1114145256Sjkoshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1115145256Sjkoshy 1116145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1117145256Sjkoshy p = LIST_FIRST(&p->p_children); 1118145256Sjkoshy else for (;;) { 1119145256Sjkoshy if (p == top) 1120145256Sjkoshy goto done; 1121145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1122145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1123145256Sjkoshy break; 1124145256Sjkoshy } 1125145256Sjkoshy p = p->p_pptr; 1126145256Sjkoshy } 1127145256Sjkoshy } 1128145256Sjkoshy 1129145256Sjkoshy done: 1130145256Sjkoshy sx_sunlock(&proctree_lock); 1131147191Sjkoshy 1132147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 1133147191Sjkoshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1134147191Sjkoshy 1135145256Sjkoshy return 0; 1136145256Sjkoshy} 1137145256Sjkoshy 1138147191Sjkoshy 1139145256Sjkoshy/* 1140147191Sjkoshy * Thread context switch IN 1141145256Sjkoshy */ 1142145256Sjkoshy 1143147191Sjkoshystatic void 1144147191Sjkoshypmc_process_csw_in(struct thread *td) 1145147191Sjkoshy{ 1146147191Sjkoshy int cpu; 1147147191Sjkoshy unsigned int ri; 1148147191Sjkoshy struct pmc *pm; 1149147191Sjkoshy struct proc *p; 1150147191Sjkoshy struct pmc_cpu *pc; 1151147191Sjkoshy struct pmc_hw *phw; 1152147191Sjkoshy struct pmc_process *pp; 1153147191Sjkoshy pmc_value_t newvalue; 1154145256Sjkoshy 1155147191Sjkoshy p = td->td_proc; 1156145256Sjkoshy 1157147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1158147191Sjkoshy return; 1159145256Sjkoshy 1160147191Sjkoshy KASSERT(pp->pp_proc == td->td_proc, 1161147191Sjkoshy ("[pmc,%d] not my thread state", __LINE__)); 1162145256Sjkoshy 1163147191Sjkoshy critical_enter(); /* no preemption from this point */ 1164145256Sjkoshy 1165147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1166145256Sjkoshy 1167147191Sjkoshy PMCDBG(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1168147191Sjkoshy p->p_pid, p->p_comm, pp); 1169145256Sjkoshy 1170147191Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1171147191Sjkoshy ("[pmc,%d] wierd CPU id %d", __LINE__, cpu)); 1172145256Sjkoshy 1173147191Sjkoshy pc = pmc_pcpu[cpu]; 1174145256Sjkoshy 1175147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1176145256Sjkoshy 1177147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1178147191Sjkoshy continue; 1179147191Sjkoshy 1180147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1181147191Sjkoshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1182147191Sjkoshy __LINE__, PMC_TO_MODE(pm))); 1183147191Sjkoshy 1184147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1185147191Sjkoshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1186147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1187147191Sjkoshy 1188145256Sjkoshy /* 1189147191Sjkoshy * Only PMCs that are marked as 'RUNNING' need 1190147191Sjkoshy * be placed on hardware. 1191145256Sjkoshy */ 1192145256Sjkoshy 1193147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 1194147191Sjkoshy continue; 1195145256Sjkoshy 1196147191Sjkoshy /* increment PMC runcount */ 1197147191Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); 1198145256Sjkoshy 1199147191Sjkoshy /* configure the HWPMC we are going to use. */ 1200147191Sjkoshy md->pmd_config_pmc(cpu, ri, pm); 1201145256Sjkoshy 1202147191Sjkoshy phw = pc->pc_hwpmcs[ri]; 1203145256Sjkoshy 1204147191Sjkoshy KASSERT(phw != NULL, 1205147191Sjkoshy ("[pmc,%d] null hw pointer", __LINE__)); 1206145256Sjkoshy 1207147191Sjkoshy KASSERT(phw->phw_pmc == pm, 1208147191Sjkoshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1209147191Sjkoshy phw->phw_pmc, pm)); 1210145256Sjkoshy 1211147191Sjkoshy /* 1212147191Sjkoshy * Write out saved value and start the PMC. 1213147191Sjkoshy * 1214147191Sjkoshy * Sampling PMCs use a per-process value, while 1215147191Sjkoshy * counting mode PMCs use a per-pmc value that is 1216147191Sjkoshy * inherited across descendants. 1217147191Sjkoshy */ 1218147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1219147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1220147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1221147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval; 1222147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1223147191Sjkoshy } else { 1224147191Sjkoshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1225147191Sjkoshy ("[pmc,%d] illegal mode=%d", __LINE__, 1226147191Sjkoshy PMC_TO_MODE(pm))); 1227147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1228147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1229147191Sjkoshy pm->pm_gv.pm_savedvalue; 1230147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1231147191Sjkoshy } 1232145256Sjkoshy 1233147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1234145256Sjkoshy 1235147191Sjkoshy md->pmd_write_pmc(cpu, ri, newvalue); 1236147191Sjkoshy md->pmd_start_pmc(cpu, ri); 1237147191Sjkoshy } 1238145256Sjkoshy 1239147191Sjkoshy /* 1240147191Sjkoshy * perform any other architecture/cpu dependent thread 1241147191Sjkoshy * switch-in actions. 1242147191Sjkoshy */ 1243145256Sjkoshy 1244147191Sjkoshy (void) (*md->pmd_switch_in)(pc, pp); 1245145256Sjkoshy 1246147191Sjkoshy critical_exit(); 1247145256Sjkoshy 1248147191Sjkoshy} 1249145256Sjkoshy 1250147191Sjkoshy/* 1251147191Sjkoshy * Thread context switch OUT. 1252147191Sjkoshy */ 1253145256Sjkoshy 1254147191Sjkoshystatic void 1255147191Sjkoshypmc_process_csw_out(struct thread *td) 1256147191Sjkoshy{ 1257147191Sjkoshy int cpu; 1258147191Sjkoshy enum pmc_mode mode; 1259147191Sjkoshy unsigned int ri; 1260147191Sjkoshy struct pmc *pm; 1261147191Sjkoshy struct proc *p; 1262147191Sjkoshy struct pmc_cpu *pc; 1263147191Sjkoshy struct pmc_process *pp; 1264147191Sjkoshy int64_t tmp; 1265147191Sjkoshy pmc_value_t newvalue; 1266145256Sjkoshy 1267147191Sjkoshy /* 1268147191Sjkoshy * Locate our process descriptor; this may be NULL if 1269147191Sjkoshy * this process is exiting and we have already removed 1270147191Sjkoshy * the process from the target process table. 1271147191Sjkoshy * 1272147191Sjkoshy * Note that due to kernel preemption, multiple 1273147191Sjkoshy * context switches may happen while the process is 1274147191Sjkoshy * exiting. 1275147191Sjkoshy * 1276147191Sjkoshy * Note also that if the target process cannot be 1277147191Sjkoshy * found we still need to deconfigure any PMCs that 1278147191Sjkoshy * are currently running on hardware. 1279147191Sjkoshy */ 1280145256Sjkoshy 1281147191Sjkoshy p = td->td_proc; 1282147191Sjkoshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1283145256Sjkoshy 1284147191Sjkoshy /* 1285147191Sjkoshy * save PMCs 1286147191Sjkoshy */ 1287145256Sjkoshy 1288147191Sjkoshy critical_enter(); 1289145774Sjkoshy 1290147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1291145256Sjkoshy 1292147191Sjkoshy PMCDBG(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1293147191Sjkoshy p->p_pid, p->p_comm, pp); 1294145615Sjkoshy 1295147191Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1296147191Sjkoshy ("[pmc,%d wierd CPU id %d", __LINE__, cpu)); 1297145615Sjkoshy 1298147191Sjkoshy pc = pmc_pcpu[cpu]; 1299145615Sjkoshy 1300147191Sjkoshy /* 1301147191Sjkoshy * When a PMC gets unlinked from a target PMC, it will 1302147191Sjkoshy * be removed from the target's pp_pmc[] array. 1303147191Sjkoshy * 1304147191Sjkoshy * However, on a MP system, the target could have been 1305147191Sjkoshy * executing on another CPU at the time of the unlink. 1306147191Sjkoshy * So, at context switch OUT time, we need to look at 1307147191Sjkoshy * the hardware to determine if a PMC is scheduled on 1308147191Sjkoshy * it. 1309147191Sjkoshy */ 1310145256Sjkoshy 1311147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1312145256Sjkoshy 1313147191Sjkoshy pm = NULL; 1314147191Sjkoshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 1315145256Sjkoshy 1316147191Sjkoshy if (pm == NULL) /* nothing at this row index */ 1317147191Sjkoshy continue; 1318145256Sjkoshy 1319147191Sjkoshy mode = PMC_TO_MODE(pm); 1320147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1321147191Sjkoshy continue; /* not a process virtual PMC */ 1322145774Sjkoshy 1323147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1324147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1325147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1326145256Sjkoshy 1327147191Sjkoshy /* Stop hardware if not already stopped */ 1328147867Sjkoshy if (pm->pm_stalled == 0) 1329147191Sjkoshy md->pmd_stop_pmc(cpu, ri); 1330147191Sjkoshy 1331147191Sjkoshy /* reduce this PMC's runcount */ 1332147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 1333147191Sjkoshy 1334145256Sjkoshy /* 1335147191Sjkoshy * If this PMC is associated with this process, 1336147191Sjkoshy * save the reading. 1337145256Sjkoshy */ 1338145256Sjkoshy 1339147191Sjkoshy if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) { 1340147191Sjkoshy 1341147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1342147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1343147191Sjkoshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1344147191Sjkoshy 1345147191Sjkoshy KASSERT(pp->pp_refcnt > 0, 1346147191Sjkoshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1347147191Sjkoshy pp->pp_refcnt)); 1348147191Sjkoshy 1349147191Sjkoshy md->pmd_read_pmc(cpu, ri, &newvalue); 1350147191Sjkoshy 1351147191Sjkoshy tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1352147191Sjkoshy 1353147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d tmp=%jd", cpu, ri, 1354147191Sjkoshy tmp); 1355147191Sjkoshy 1356147191Sjkoshy if (mode == PMC_MODE_TS) { 1357147191Sjkoshy 1358147191Sjkoshy /* 1359147191Sjkoshy * For sampling process-virtual PMCs, 1360147191Sjkoshy * we expect the count to be 1361147191Sjkoshy * decreasing as the 'value' 1362147191Sjkoshy * programmed into the PMC is the 1363147191Sjkoshy * number of events to be seen till 1364147191Sjkoshy * the next sampling interrupt. 1365147191Sjkoshy */ 1366147191Sjkoshy if (tmp < 0) 1367147191Sjkoshy tmp += pm->pm_sc.pm_reloadcount; 1368147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1369147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval -= tmp; 1370147191Sjkoshy if ((int64_t) pp->pp_pmcs[ri].pp_pmcval < 0) 1371147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += 1372147191Sjkoshy pm->pm_sc.pm_reloadcount; 1373147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1374147191Sjkoshy 1375147191Sjkoshy } else { 1376147191Sjkoshy 1377147191Sjkoshy /* 1378147191Sjkoshy * For counting process-virtual PMCs, 1379147191Sjkoshy * we expect the count to be 1380147191Sjkoshy * increasing monotonically, modulo a 64 1381147191Sjkoshy * bit wraparound. 1382147191Sjkoshy */ 1383147191Sjkoshy KASSERT((int64_t) tmp >= 0, 1384147191Sjkoshy ("[pmc,%d] negative increment cpu=%d " 1385147191Sjkoshy "ri=%d newvalue=%jx saved=%jx " 1386147191Sjkoshy "incr=%jx", __LINE__, cpu, ri, 1387147191Sjkoshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1388147191Sjkoshy 1389147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1390147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 1391147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1392147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1393147191Sjkoshy 1394147191Sjkoshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1395147191Sjkoshy pmclog_process_proccsw(pm, pp, tmp); 1396147191Sjkoshy } 1397145256Sjkoshy } 1398145256Sjkoshy 1399147191Sjkoshy /* mark hardware as free */ 1400147191Sjkoshy md->pmd_config_pmc(cpu, ri, NULL); 1401145256Sjkoshy } 1402145256Sjkoshy 1403145256Sjkoshy /* 1404147191Sjkoshy * perform any other architecture/cpu dependent thread 1405147191Sjkoshy * switch out functions. 1406147191Sjkoshy */ 1407147191Sjkoshy 1408147191Sjkoshy (void) (*md->pmd_switch_out)(pc, pp); 1409147191Sjkoshy 1410147191Sjkoshy critical_exit(); 1411147191Sjkoshy} 1412147191Sjkoshy 1413147191Sjkoshy/* 1414147191Sjkoshy * The 'hook' invoked from the kernel proper 1415147191Sjkoshy */ 1416147191Sjkoshy 1417147191Sjkoshy 1418147191Sjkoshy#if DEBUG 1419147191Sjkoshyconst char *pmc_hooknames[] = { 1420147191Sjkoshy "", 1421147191Sjkoshy "EXIT", 1422147191Sjkoshy "EXEC", 1423147191Sjkoshy "FORK", 1424147191Sjkoshy "CSW-IN", 1425147191Sjkoshy "CSW-OUT", 1426147191Sjkoshy "SAMPLE" 1427147191Sjkoshy}; 1428147191Sjkoshy#endif 1429147191Sjkoshy 1430147191Sjkoshystatic int 1431147191Sjkoshypmc_hook_handler(struct thread *td, int function, void *arg) 1432147191Sjkoshy{ 1433147191Sjkoshy 1434147191Sjkoshy PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1435147191Sjkoshy pmc_hooknames[function], arg); 1436147191Sjkoshy 1437147191Sjkoshy switch (function) 1438147191Sjkoshy { 1439147191Sjkoshy 1440147191Sjkoshy /* 1441145256Sjkoshy * Process exec() 1442145256Sjkoshy */ 1443145256Sjkoshy 1444145256Sjkoshy case PMC_FN_PROCESS_EXEC: 1445145256Sjkoshy { 1446147191Sjkoshy char *fullpath, *freepath; 1447145256Sjkoshy unsigned int ri; 1448147191Sjkoshy int is_using_hwpmcs; 1449145256Sjkoshy struct pmc *pm; 1450145256Sjkoshy struct proc *p; 1451145256Sjkoshy struct pmc_owner *po; 1452145256Sjkoshy struct pmc_process *pp; 1453147708Sjkoshy struct pmckern_procexec *pk; 1454145256Sjkoshy 1455145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1456145256Sjkoshy 1457147191Sjkoshy p = td->td_proc; 1458147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1459147191Sjkoshy 1460147708Sjkoshy pk = (struct pmckern_procexec *) arg; 1461147708Sjkoshy 1462147191Sjkoshy /* Inform owners of SS mode PMCs of the exec event. */ 1463147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1464147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1465147708Sjkoshy pmclog_process_procexec(po, PMC_ID_INVALID, 1466147708Sjkoshy p->p_pid, pk->pm_entryaddr, fullpath); 1467147191Sjkoshy 1468147191Sjkoshy PROC_LOCK(p); 1469147191Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1470147191Sjkoshy PROC_UNLOCK(p); 1471147191Sjkoshy 1472147191Sjkoshy if (!is_using_hwpmcs) { 1473147191Sjkoshy if (freepath) 1474147191Sjkoshy FREE(freepath, M_TEMP); 1475147191Sjkoshy break; 1476147191Sjkoshy } 1477147191Sjkoshy 1478145256Sjkoshy /* 1479145256Sjkoshy * PMCs are not inherited across an exec(): remove any 1480145256Sjkoshy * PMCs that this process is the owner of. 1481145256Sjkoshy */ 1482145256Sjkoshy 1483145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1484145256Sjkoshy pmc_remove_owner(po); 1485147191Sjkoshy pmc_destroy_owner_descriptor(po); 1486145256Sjkoshy } 1487145256Sjkoshy 1488145256Sjkoshy /* 1489145256Sjkoshy * If this process is the target of a PMC, check if the new 1490145256Sjkoshy * credentials are compatible with the owner's permissions. 1491145256Sjkoshy */ 1492145256Sjkoshy 1493145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1494145256Sjkoshy break; 1495145256Sjkoshy 1496147191Sjkoshy /* 1497147191Sjkoshy * Log the exec event to all monitoring owners. Skip 1498147191Sjkoshy * owners who have already recieved the event because 1499147191Sjkoshy * the have system sampling PMCs active. 1500147191Sjkoshy */ 1501147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1502147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1503147191Sjkoshy po = pm->pm_owner; 1504147191Sjkoshy if (po->po_sscount == 0 && 1505147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 1506147708Sjkoshy pmclog_process_procexec(po, pm->pm_id, 1507147708Sjkoshy p->p_pid, pk->pm_entryaddr, 1508147191Sjkoshy fullpath); 1509147191Sjkoshy } 1510147191Sjkoshy 1511147191Sjkoshy if (freepath) 1512147191Sjkoshy FREE(freepath, M_TEMP); 1513147191Sjkoshy 1514145256Sjkoshy 1515145256Sjkoshy PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 1516147708Sjkoshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1517145256Sjkoshy 1518147708Sjkoshy if (pk->pm_credentialschanged == 0) /* no change */ 1519145256Sjkoshy break; 1520145256Sjkoshy 1521145256Sjkoshy /* 1522145256Sjkoshy * If the newly exec()'ed process has a different credential 1523145256Sjkoshy * than before, allow it to be the target of a PMC only if 1524145256Sjkoshy * the PMC's owner has sufficient priviledge. 1525145256Sjkoshy */ 1526145256Sjkoshy 1527145256Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1528145256Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1529145256Sjkoshy if (pmc_can_attach(pm, td->td_proc) != 0) 1530145256Sjkoshy pmc_detach_one_process(td->td_proc, 1531145256Sjkoshy pm, PMC_FLAG_NONE); 1532145256Sjkoshy 1533145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1534145256Sjkoshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1535145256Sjkoshy pp->pp_refcnt, pp)); 1536145256Sjkoshy 1537145256Sjkoshy /* 1538145256Sjkoshy * If this process is no longer the target of any 1539145256Sjkoshy * PMCs, we can remove the process entry and free 1540145256Sjkoshy * up space. 1541145256Sjkoshy */ 1542145256Sjkoshy 1543145256Sjkoshy if (pp->pp_refcnt == 0) { 1544145256Sjkoshy pmc_remove_process_descriptor(pp); 1545145256Sjkoshy FREE(pp, M_PMC); 1546147191Sjkoshy break; 1547145256Sjkoshy } 1548145256Sjkoshy 1549145256Sjkoshy } 1550145256Sjkoshy break; 1551145256Sjkoshy 1552145256Sjkoshy case PMC_FN_CSW_IN: 1553147191Sjkoshy pmc_process_csw_in(td); 1554147191Sjkoshy break; 1555145256Sjkoshy 1556147191Sjkoshy case PMC_FN_CSW_OUT: 1557147191Sjkoshy pmc_process_csw_out(td); 1558147191Sjkoshy break; 1559145256Sjkoshy 1560145256Sjkoshy /* 1561147191Sjkoshy * Process accumulated PC samples. 1562147191Sjkoshy * 1563147191Sjkoshy * This function is expected to be called by hardclock() for 1564147191Sjkoshy * each CPU that has accumulated PC samples. 1565147191Sjkoshy * 1566147191Sjkoshy * This function is to be executed on the CPU whose samples 1567147191Sjkoshy * are being processed. 1568145256Sjkoshy */ 1569147191Sjkoshy case PMC_FN_DO_SAMPLES: 1570145256Sjkoshy 1571145256Sjkoshy /* 1572147191Sjkoshy * Clear the cpu specific bit in the CPU mask before 1573147191Sjkoshy * do the rest of the processing. If the NMI handler 1574147191Sjkoshy * gets invoked after the "atomic_clear_int()" call 1575147191Sjkoshy * below but before "pmc_process_samples()" gets 1576147191Sjkoshy * around to processing the interrupt, then we will 1577147191Sjkoshy * come back here at the next hardclock() tick (and 1578147191Sjkoshy * may find nothing to do if "pmc_process_samples()" 1579147191Sjkoshy * had already processed the interrupt). We don't 1580147191Sjkoshy * lose the interrupt sample. 1581145256Sjkoshy */ 1582147191Sjkoshy atomic_clear_int(&pmc_cpumask, (1 << PCPU_GET(cpuid))); 1583147191Sjkoshy pmc_process_samples(PCPU_GET(cpuid)); 1584147191Sjkoshy break; 1585145256Sjkoshy 1586145256Sjkoshy default: 1587145256Sjkoshy#if DEBUG 1588145256Sjkoshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 1589145256Sjkoshy#endif 1590145256Sjkoshy break; 1591145256Sjkoshy 1592145256Sjkoshy } 1593145256Sjkoshy 1594145256Sjkoshy return 0; 1595145256Sjkoshy} 1596145256Sjkoshy 1597145256Sjkoshy/* 1598145256Sjkoshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 1599145256Sjkoshy */ 1600145256Sjkoshy 1601145256Sjkoshystatic struct pmc_owner * 1602145256Sjkoshypmc_allocate_owner_descriptor(struct proc *p) 1603145256Sjkoshy{ 1604145256Sjkoshy uint32_t hindex; 1605145256Sjkoshy struct pmc_owner *po; 1606145256Sjkoshy struct pmc_ownerhash *poh; 1607145256Sjkoshy 1608145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1609145256Sjkoshy poh = &pmc_ownerhash[hindex]; 1610145256Sjkoshy 1611145256Sjkoshy /* allocate space for N pointers and one descriptor struct */ 1612145256Sjkoshy MALLOC(po, struct pmc_owner *, sizeof(struct pmc_owner), 1613147191Sjkoshy M_PMC, M_ZERO|M_WAITOK); 1614145256Sjkoshy 1615147191Sjkoshy po->po_sscount = po->po_error = po->po_flags = 0; 1616147191Sjkoshy po->po_file = NULL; 1617145256Sjkoshy po->po_owner = p; 1618147191Sjkoshy po->po_kthread = NULL; 1619145256Sjkoshy LIST_INIT(&po->po_pmcs); 1620145256Sjkoshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 1621145256Sjkoshy 1622147191Sjkoshy TAILQ_INIT(&po->po_logbuffers); 1623147191Sjkoshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc", MTX_SPIN); 1624147191Sjkoshy 1625145256Sjkoshy PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 1626145256Sjkoshy p, p->p_pid, p->p_comm, po); 1627145256Sjkoshy 1628145256Sjkoshy return po; 1629145256Sjkoshy} 1630145256Sjkoshy 1631147191Sjkoshystatic void 1632147191Sjkoshypmc_destroy_owner_descriptor(struct pmc_owner *po) 1633147191Sjkoshy{ 1634147191Sjkoshy 1635147191Sjkoshy PMCDBG(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 1636147191Sjkoshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 1637147191Sjkoshy 1638147191Sjkoshy mtx_destroy(&po->po_mtx); 1639147191Sjkoshy FREE(po, M_PMC); 1640147191Sjkoshy} 1641147191Sjkoshy 1642145256Sjkoshy/* 1643145256Sjkoshy * find the descriptor corresponding to process 'p', adding or removing it 1644145256Sjkoshy * as specified by 'mode'. 1645145256Sjkoshy */ 1646145256Sjkoshy 1647145256Sjkoshystatic struct pmc_process * 1648145256Sjkoshypmc_find_process_descriptor(struct proc *p, uint32_t mode) 1649145256Sjkoshy{ 1650145256Sjkoshy uint32_t hindex; 1651145256Sjkoshy struct pmc_process *pp, *ppnew; 1652145256Sjkoshy struct pmc_processhash *pph; 1653145256Sjkoshy 1654145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 1655145256Sjkoshy pph = &pmc_processhash[hindex]; 1656145256Sjkoshy 1657145256Sjkoshy ppnew = NULL; 1658145256Sjkoshy 1659145256Sjkoshy /* 1660145256Sjkoshy * Pre-allocate memory in the FIND_ALLOCATE case since we 1661145256Sjkoshy * cannot call malloc(9) once we hold a spin lock. 1662145256Sjkoshy */ 1663145256Sjkoshy 1664145256Sjkoshy if (mode & PMC_FLAG_ALLOCATE) { 1665145256Sjkoshy /* allocate additional space for 'n' pmc pointers */ 1666145256Sjkoshy MALLOC(ppnew, struct pmc_process *, 1667145256Sjkoshy sizeof(struct pmc_process) + md->pmd_npmc * 1668145256Sjkoshy sizeof(struct pmc_targetstate), M_PMC, M_ZERO|M_WAITOK); 1669145256Sjkoshy } 1670145256Sjkoshy 1671145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1672145256Sjkoshy LIST_FOREACH(pp, pph, pp_next) 1673145256Sjkoshy if (pp->pp_proc == p) 1674145256Sjkoshy break; 1675145256Sjkoshy 1676145256Sjkoshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 1677145256Sjkoshy LIST_REMOVE(pp, pp_next); 1678145256Sjkoshy 1679145256Sjkoshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 1680145256Sjkoshy ppnew != NULL) { 1681145256Sjkoshy ppnew->pp_proc = p; 1682145256Sjkoshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 1683145256Sjkoshy pp = ppnew; 1684145256Sjkoshy ppnew = NULL; 1685145256Sjkoshy } 1686145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1687145256Sjkoshy 1688145256Sjkoshy if (pp != NULL && ppnew != NULL) 1689145256Sjkoshy FREE(ppnew, M_PMC); 1690145256Sjkoshy 1691145256Sjkoshy return pp; 1692145256Sjkoshy} 1693145256Sjkoshy 1694145256Sjkoshy/* 1695145256Sjkoshy * remove a process descriptor from the process hash table. 1696145256Sjkoshy */ 1697145256Sjkoshy 1698145256Sjkoshystatic void 1699145256Sjkoshypmc_remove_process_descriptor(struct pmc_process *pp) 1700145256Sjkoshy{ 1701145256Sjkoshy KASSERT(pp->pp_refcnt == 0, 1702145256Sjkoshy ("[pmc,%d] Removing process descriptor %p with count %d", 1703145256Sjkoshy __LINE__, pp, pp->pp_refcnt)); 1704145256Sjkoshy 1705145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1706145256Sjkoshy LIST_REMOVE(pp, pp_next); 1707145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1708145256Sjkoshy} 1709145256Sjkoshy 1710145256Sjkoshy 1711145256Sjkoshy/* 1712145256Sjkoshy * find an owner descriptor corresponding to proc 'p' 1713145256Sjkoshy */ 1714145256Sjkoshy 1715145256Sjkoshystatic struct pmc_owner * 1716145256Sjkoshypmc_find_owner_descriptor(struct proc *p) 1717145256Sjkoshy{ 1718145256Sjkoshy uint32_t hindex; 1719145256Sjkoshy struct pmc_owner *po; 1720145256Sjkoshy struct pmc_ownerhash *poh; 1721145256Sjkoshy 1722145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1723145256Sjkoshy poh = &pmc_ownerhash[hindex]; 1724145256Sjkoshy 1725145256Sjkoshy po = NULL; 1726145256Sjkoshy LIST_FOREACH(po, poh, po_next) 1727145256Sjkoshy if (po->po_owner == p) 1728145256Sjkoshy break; 1729145256Sjkoshy 1730145256Sjkoshy PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 1731145256Sjkoshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 1732145256Sjkoshy 1733145256Sjkoshy return po; 1734145256Sjkoshy} 1735145256Sjkoshy 1736145256Sjkoshy/* 1737145256Sjkoshy * pmc_allocate_pmc_descriptor 1738145256Sjkoshy * 1739145256Sjkoshy * Allocate a pmc descriptor and initialize its 1740145256Sjkoshy * fields. 1741145256Sjkoshy */ 1742145256Sjkoshy 1743145256Sjkoshystatic struct pmc * 1744145256Sjkoshypmc_allocate_pmc_descriptor(void) 1745145256Sjkoshy{ 1746145256Sjkoshy struct pmc *pmc; 1747145256Sjkoshy 1748145256Sjkoshy MALLOC(pmc, struct pmc *, sizeof(struct pmc), M_PMC, M_ZERO|M_WAITOK); 1749145256Sjkoshy 1750145256Sjkoshy if (pmc != NULL) { 1751145256Sjkoshy pmc->pm_owner = NULL; 1752145256Sjkoshy LIST_INIT(&pmc->pm_targets); 1753145256Sjkoshy } 1754145256Sjkoshy 1755145256Sjkoshy PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 1756145256Sjkoshy 1757145256Sjkoshy return pmc; 1758145256Sjkoshy} 1759145256Sjkoshy 1760145256Sjkoshy/* 1761145256Sjkoshy * Destroy a pmc descriptor. 1762145256Sjkoshy */ 1763145256Sjkoshy 1764145256Sjkoshystatic void 1765145256Sjkoshypmc_destroy_pmc_descriptor(struct pmc *pm) 1766145256Sjkoshy{ 1767145256Sjkoshy (void) pm; 1768145256Sjkoshy 1769145256Sjkoshy#if DEBUG 1770145256Sjkoshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 1771145256Sjkoshy pm->pm_state == PMC_STATE_FREE, 1772145256Sjkoshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 1773145256Sjkoshy KASSERT(LIST_EMPTY(&pm->pm_targets), 1774145256Sjkoshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 1775145256Sjkoshy KASSERT(pm->pm_owner == NULL, 1776145256Sjkoshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 1777145256Sjkoshy KASSERT(pm->pm_runcount == 0, 1778145256Sjkoshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 1779145256Sjkoshy pm->pm_runcount)); 1780145256Sjkoshy#endif 1781145256Sjkoshy} 1782145256Sjkoshy 1783147191Sjkoshystatic void 1784147191Sjkoshypmc_wait_for_pmc_idle(struct pmc *pm) 1785147191Sjkoshy{ 1786147191Sjkoshy#if DEBUG 1787147191Sjkoshy volatile int maxloop; 1788147191Sjkoshy 1789147191Sjkoshy maxloop = 100 * mp_ncpus; 1790147191Sjkoshy#endif 1791147191Sjkoshy 1792147191Sjkoshy /* 1793147191Sjkoshy * Loop (with a forced context switch) till the PMC's runcount 1794147191Sjkoshy * comes down to zero. 1795147191Sjkoshy */ 1796147191Sjkoshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 1797147191Sjkoshy#if DEBUG 1798147191Sjkoshy maxloop--; 1799147191Sjkoshy KASSERT(maxloop > 0, 1800147191Sjkoshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 1801147191Sjkoshy "pmc to be free", __LINE__, 1802147191Sjkoshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 1803147191Sjkoshy#endif 1804147191Sjkoshy pmc_force_context_switch(); 1805147191Sjkoshy } 1806147191Sjkoshy} 1807147191Sjkoshy 1808145256Sjkoshy/* 1809145256Sjkoshy * This function does the following things: 1810145256Sjkoshy * 1811145256Sjkoshy * - detaches the PMC from hardware 1812145256Sjkoshy * - unlinks all target threads that were attached to it 1813145256Sjkoshy * - removes the PMC from its owner's list 1814145256Sjkoshy * - destroy's the PMC private mutex 1815145256Sjkoshy * 1816145256Sjkoshy * Once this function completes, the given pmc pointer can be safely 1817145256Sjkoshy * FREE'd by the caller. 1818145256Sjkoshy */ 1819145256Sjkoshy 1820145256Sjkoshystatic void 1821145256Sjkoshypmc_release_pmc_descriptor(struct pmc *pm) 1822145256Sjkoshy{ 1823145256Sjkoshy u_int ri, cpu; 1824145774Sjkoshy enum pmc_mode mode; 1825145256Sjkoshy struct pmc_hw *phw; 1826147191Sjkoshy struct pmc_owner *po; 1827145256Sjkoshy struct pmc_process *pp; 1828145256Sjkoshy struct pmc_target *ptgt, *tmp; 1829145256Sjkoshy struct pmc_binding pb; 1830145256Sjkoshy 1831145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1832145256Sjkoshy 1833145256Sjkoshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 1834145256Sjkoshy 1835145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1836145774Sjkoshy mode = PMC_TO_MODE(pm); 1837145256Sjkoshy 1838145256Sjkoshy PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 1839145774Sjkoshy mode); 1840145256Sjkoshy 1841145256Sjkoshy /* 1842145256Sjkoshy * First, we take the PMC off hardware. 1843145256Sjkoshy */ 1844145301Simp cpu = 0; 1845145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 1846145256Sjkoshy 1847145256Sjkoshy /* 1848145256Sjkoshy * A system mode PMC runs on a specific CPU. Switch 1849145256Sjkoshy * to this CPU and turn hardware off. 1850145256Sjkoshy */ 1851145256Sjkoshy pmc_save_cpu_binding(&pb); 1852145256Sjkoshy 1853145774Sjkoshy cpu = PMC_TO_CPU(pm); 1854145256Sjkoshy 1855147191Sjkoshy pmc_select_cpu(cpu); 1856145256Sjkoshy 1857147191Sjkoshy /* switch off non-stalled CPUs */ 1858147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 1859147867Sjkoshy pm->pm_stalled == 0) { 1860145256Sjkoshy 1861145256Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 1862145256Sjkoshy 1863145256Sjkoshy KASSERT(phw->phw_pmc == pm, 1864145256Sjkoshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 1865145256Sjkoshy __LINE__, ri, phw->phw_pmc, pm)); 1866145256Sjkoshy PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 1867145256Sjkoshy 1868145256Sjkoshy critical_enter(); 1869145256Sjkoshy md->pmd_stop_pmc(cpu, ri); 1870145256Sjkoshy critical_exit(); 1871145256Sjkoshy } 1872145256Sjkoshy 1873145256Sjkoshy PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 1874145256Sjkoshy 1875145256Sjkoshy critical_enter(); 1876145256Sjkoshy md->pmd_config_pmc(cpu, ri, NULL); 1877145256Sjkoshy critical_exit(); 1878145256Sjkoshy 1879147191Sjkoshy /* adjust the global and process count of SS mode PMCs */ 1880147191Sjkoshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 1881147191Sjkoshy po = pm->pm_owner; 1882147191Sjkoshy po->po_sscount--; 1883147191Sjkoshy if (po->po_sscount == 0) { 1884147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 1885147191Sjkoshy LIST_REMOVE(po, po_ssnext); 1886147191Sjkoshy } 1887147191Sjkoshy } 1888147191Sjkoshy 1889145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 1890145256Sjkoshy 1891145256Sjkoshy pmc_restore_cpu_binding(&pb); 1892145256Sjkoshy 1893147191Sjkoshy /* 1894147191Sjkoshy * We could have references to this PMC structure in 1895147191Sjkoshy * the per-cpu sample queues. Wait for the queue to 1896147191Sjkoshy * drain. 1897147191Sjkoshy */ 1898147191Sjkoshy pmc_wait_for_pmc_idle(pm); 1899147191Sjkoshy 1900145774Sjkoshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 1901145256Sjkoshy 1902145256Sjkoshy /* 1903145256Sjkoshy * A virtual PMC could be running on multiple CPUs at 1904145256Sjkoshy * a given instant. 1905145256Sjkoshy * 1906145256Sjkoshy * By marking its state as DELETED, we ensure that 1907145256Sjkoshy * this PMC is never further scheduled on hardware. 1908145256Sjkoshy * 1909145256Sjkoshy * Then we wait till all CPUs are done with this PMC. 1910145256Sjkoshy */ 1911145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 1912145256Sjkoshy 1913145256Sjkoshy 1914147191Sjkoshy /* Wait for the PMCs runcount to come to zero. */ 1915147191Sjkoshy pmc_wait_for_pmc_idle(pm); 1916145256Sjkoshy 1917145256Sjkoshy /* 1918145256Sjkoshy * At this point the PMC is off all CPUs and cannot be 1919145256Sjkoshy * freshly scheduled onto a CPU. It is now safe to 1920145256Sjkoshy * unlink all targets from this PMC. If a 1921145256Sjkoshy * process-record's refcount falls to zero, we remove 1922145256Sjkoshy * it from the hash table. The module-wide SX lock 1923145256Sjkoshy * protects us from races. 1924145256Sjkoshy */ 1925145256Sjkoshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 1926145256Sjkoshy pp = ptgt->pt_process; 1927145256Sjkoshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 1928145256Sjkoshy 1929145256Sjkoshy PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 1930145256Sjkoshy 1931145256Sjkoshy /* 1932145256Sjkoshy * If the target process record shows that no 1933145256Sjkoshy * PMCs are attached to it, reclaim its space. 1934145256Sjkoshy */ 1935145256Sjkoshy 1936145256Sjkoshy if (pp->pp_refcnt == 0) { 1937145256Sjkoshy pmc_remove_process_descriptor(pp); 1938145256Sjkoshy FREE(pp, M_PMC); 1939145256Sjkoshy } 1940145256Sjkoshy } 1941145256Sjkoshy 1942145256Sjkoshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 1943145256Sjkoshy 1944145256Sjkoshy } 1945145256Sjkoshy 1946145256Sjkoshy /* 1947145256Sjkoshy * Release any MD resources 1948145256Sjkoshy */ 1949145256Sjkoshy 1950145256Sjkoshy (void) md->pmd_release_pmc(cpu, ri, pm); 1951145256Sjkoshy 1952145256Sjkoshy /* 1953145256Sjkoshy * Update row disposition 1954145256Sjkoshy */ 1955145256Sjkoshy 1956145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 1957145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 1958145256Sjkoshy else 1959145256Sjkoshy PMC_UNMARK_ROW_THREAD(ri); 1960145256Sjkoshy 1961145256Sjkoshy /* unlink from the owner's list */ 1962147191Sjkoshy if (pm->pm_owner) { 1963147191Sjkoshy LIST_REMOVE(pm, pm_next); 1964147191Sjkoshy pm->pm_owner = NULL; 1965147191Sjkoshy } 1966145256Sjkoshy 1967145256Sjkoshy pmc_destroy_pmc_descriptor(pm); 1968145256Sjkoshy} 1969145256Sjkoshy 1970145256Sjkoshy/* 1971145256Sjkoshy * Register an owner and a pmc. 1972145256Sjkoshy */ 1973145256Sjkoshy 1974145256Sjkoshystatic int 1975145256Sjkoshypmc_register_owner(struct proc *p, struct pmc *pmc) 1976145256Sjkoshy{ 1977145256Sjkoshy struct pmc_owner *po; 1978145256Sjkoshy 1979145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1980145256Sjkoshy 1981145774Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 1982147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 1983145256Sjkoshy return ENOMEM; 1984145256Sjkoshy 1985145256Sjkoshy KASSERT(pmc->pm_owner == NULL, 1986145256Sjkoshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 1987145256Sjkoshy pmc->pm_owner = po; 1988145256Sjkoshy 1989147191Sjkoshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 1990145256Sjkoshy 1991145256Sjkoshy PROC_LOCK(p); 1992145256Sjkoshy p->p_flag |= P_HWPMC; 1993145256Sjkoshy PROC_UNLOCK(p); 1994145256Sjkoshy 1995147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1996147191Sjkoshy pmclog_process_pmcallocate(pmc); 1997145256Sjkoshy 1998147191Sjkoshy PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 1999147191Sjkoshy po, pmc); 2000147191Sjkoshy 2001145256Sjkoshy return 0; 2002145256Sjkoshy} 2003145256Sjkoshy 2004145256Sjkoshy/* 2005145256Sjkoshy * Return the current row disposition: 2006145256Sjkoshy * == 0 => FREE 2007145256Sjkoshy * > 0 => PROCESS MODE 2008145256Sjkoshy * < 0 => SYSTEM MODE 2009145256Sjkoshy */ 2010145256Sjkoshy 2011145256Sjkoshyint 2012145256Sjkoshypmc_getrowdisp(int ri) 2013145256Sjkoshy{ 2014145256Sjkoshy return pmc_pmcdisp[ri]; 2015145256Sjkoshy} 2016145256Sjkoshy 2017145256Sjkoshy/* 2018145256Sjkoshy * Check if a PMC at row index 'ri' can be allocated to the current 2019145256Sjkoshy * process. 2020145256Sjkoshy * 2021145256Sjkoshy * Allocation can fail if: 2022145256Sjkoshy * - the current process is already being profiled by a PMC at index 'ri', 2023145256Sjkoshy * attached to it via OP_PMCATTACH. 2024145256Sjkoshy * - the current process has already allocated a PMC at index 'ri' 2025145256Sjkoshy * via OP_ALLOCATE. 2026145256Sjkoshy */ 2027145256Sjkoshy 2028145256Sjkoshystatic int 2029145774Sjkoshypmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2030145256Sjkoshy{ 2031145774Sjkoshy enum pmc_mode mode; 2032145774Sjkoshy struct pmc *pm; 2033145256Sjkoshy struct pmc_owner *po; 2034145256Sjkoshy struct pmc_process *pp; 2035145256Sjkoshy 2036145774Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2037145774Sjkoshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2038145256Sjkoshy 2039145774Sjkoshy /* 2040145774Sjkoshy * We shouldn't have already allocated a process-mode PMC at 2041145774Sjkoshy * row index 'ri'. 2042145774Sjkoshy * 2043145774Sjkoshy * We shouldn't have allocated a system-wide PMC on the same 2044145774Sjkoshy * CPU and same RI. 2045145774Sjkoshy */ 2046145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2047147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2048145774Sjkoshy if (PMC_TO_ROWINDEX(pm) == ri) { 2049145774Sjkoshy mode = PMC_TO_MODE(pm); 2050145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) 2051145774Sjkoshy return EEXIST; 2052145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && 2053145774Sjkoshy (int) PMC_TO_CPU(pm) == cpu) 2054145774Sjkoshy return EEXIST; 2055145774Sjkoshy } 2056145774Sjkoshy } 2057145256Sjkoshy 2058145774Sjkoshy /* 2059145774Sjkoshy * We also shouldn't be the target of any PMC at this index 2060145774Sjkoshy * since otherwise a PMC_ATTACH to ourselves will fail. 2061145774Sjkoshy */ 2062145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2063145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc) 2064145256Sjkoshy return EEXIST; 2065145256Sjkoshy 2066145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2067145256Sjkoshy p, p->p_pid, p->p_comm, ri); 2068145256Sjkoshy 2069145256Sjkoshy return 0; 2070145256Sjkoshy} 2071145256Sjkoshy 2072145256Sjkoshy/* 2073145256Sjkoshy * Check if a given PMC at row index 'ri' can be currently used in 2074145256Sjkoshy * mode 'mode'. 2075145256Sjkoshy */ 2076145256Sjkoshy 2077145256Sjkoshystatic int 2078145256Sjkoshypmc_can_allocate_row(int ri, enum pmc_mode mode) 2079145256Sjkoshy{ 2080145256Sjkoshy enum pmc_disp disp; 2081145256Sjkoshy 2082145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2083145256Sjkoshy 2084145256Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2085145256Sjkoshy 2086145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2087145256Sjkoshy disp = PMC_DISP_STANDALONE; 2088145256Sjkoshy else 2089145256Sjkoshy disp = PMC_DISP_THREAD; 2090145256Sjkoshy 2091145256Sjkoshy /* 2092145256Sjkoshy * check disposition for PMC row 'ri': 2093145256Sjkoshy * 2094145256Sjkoshy * Expected disposition Row-disposition Result 2095145256Sjkoshy * 2096145256Sjkoshy * STANDALONE STANDALONE or FREE proceed 2097145256Sjkoshy * STANDALONE THREAD fail 2098145256Sjkoshy * THREAD THREAD or FREE proceed 2099145256Sjkoshy * THREAD STANDALONE fail 2100145256Sjkoshy */ 2101145256Sjkoshy 2102145256Sjkoshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2103145256Sjkoshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2104145256Sjkoshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2105145256Sjkoshy return EBUSY; 2106145256Sjkoshy 2107145256Sjkoshy /* 2108145256Sjkoshy * All OK 2109145256Sjkoshy */ 2110145256Sjkoshy 2111145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2112145256Sjkoshy 2113145256Sjkoshy return 0; 2114145256Sjkoshy 2115145256Sjkoshy} 2116145256Sjkoshy 2117145256Sjkoshy/* 2118145774Sjkoshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2119145256Sjkoshy */ 2120145256Sjkoshy 2121145256Sjkoshystatic struct pmc * 2122145256Sjkoshypmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2123145256Sjkoshy{ 2124147191Sjkoshy struct pmc *pm; 2125145256Sjkoshy 2126145774Sjkoshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2127145774Sjkoshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2128145774Sjkoshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2129145256Sjkoshy 2130147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2131147191Sjkoshy if (pm->pm_id == pmcid) 2132147191Sjkoshy return pm; 2133145256Sjkoshy 2134145256Sjkoshy return NULL; 2135145256Sjkoshy} 2136145256Sjkoshy 2137145256Sjkoshystatic int 2138145256Sjkoshypmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2139145256Sjkoshy{ 2140145256Sjkoshy 2141145256Sjkoshy struct pmc *pm; 2142145256Sjkoshy struct pmc_owner *po; 2143145256Sjkoshy 2144145256Sjkoshy PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid); 2145145256Sjkoshy 2146145256Sjkoshy if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) 2147145256Sjkoshy return ESRCH; 2148145256Sjkoshy 2149145256Sjkoshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2150145256Sjkoshy return EINVAL; 2151145256Sjkoshy 2152145256Sjkoshy PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2153145256Sjkoshy 2154145256Sjkoshy *pmc = pm; 2155145256Sjkoshy return 0; 2156145256Sjkoshy} 2157145256Sjkoshy 2158145256Sjkoshy/* 2159145256Sjkoshy * Start a PMC. 2160145256Sjkoshy */ 2161145256Sjkoshy 2162145256Sjkoshystatic int 2163145256Sjkoshypmc_start(struct pmc *pm) 2164145256Sjkoshy{ 2165145256Sjkoshy int error, cpu, ri; 2166145774Sjkoshy enum pmc_mode mode; 2167147191Sjkoshy struct pmc_owner *po; 2168145256Sjkoshy struct pmc_binding pb; 2169145256Sjkoshy 2170145256Sjkoshy KASSERT(pm != NULL, 2171145256Sjkoshy ("[pmc,%d] null pm", __LINE__)); 2172145256Sjkoshy 2173145774Sjkoshy mode = PMC_TO_MODE(pm); 2174145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2175145774Sjkoshy error = 0; 2176145256Sjkoshy 2177145774Sjkoshy PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2178145774Sjkoshy 2179147191Sjkoshy po = pm->pm_owner; 2180145256Sjkoshy 2181145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2182145256Sjkoshy 2183145256Sjkoshy /* 2184147191Sjkoshy * If a PMCATTACH has never been done on this PMC, 2185147191Sjkoshy * attach it to its owner process. 2186145256Sjkoshy */ 2187145256Sjkoshy 2188145256Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 2189147191Sjkoshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2190147191Sjkoshy pmc_attach_process(po->po_owner, pm); 2191145256Sjkoshy 2192145774Sjkoshy /* 2193147191Sjkoshy * Disallow PMCSTART if a logfile is required but has not 2194147191Sjkoshy * been configured yet. 2195145774Sjkoshy */ 2196145256Sjkoshy 2197147191Sjkoshy if (error == 0 && (pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2198147191Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2199147191Sjkoshy error = EDOOFUS; 2200147191Sjkoshy 2201145256Sjkoshy /* 2202147191Sjkoshy * If the PMC is attached to its owner, then force a context 2203147191Sjkoshy * switch to ensure that the MD state gets set correctly. 2204145256Sjkoshy */ 2205145256Sjkoshy 2206147191Sjkoshy if (error == 0) { 2207147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2208147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2209147191Sjkoshy pmc_force_context_switch(); 2210147191Sjkoshy } 2211147191Sjkoshy 2212145774Sjkoshy return error; 2213147191Sjkoshy } 2214145256Sjkoshy 2215147191Sjkoshy 2216147191Sjkoshy /* 2217147191Sjkoshy * A system-wide PMC. 2218147191Sjkoshy */ 2219147191Sjkoshy 2220147191Sjkoshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2221147191Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2222147191Sjkoshy return EDOOFUS; /* programming error */ 2223147191Sjkoshy 2224147191Sjkoshy /* 2225147191Sjkoshy * Add the owner to the global list if this is a system-wide 2226147191Sjkoshy * sampling PMC. 2227147191Sjkoshy */ 2228147191Sjkoshy 2229147191Sjkoshy if (mode == PMC_MODE_SS) { 2230147191Sjkoshy if (po->po_sscount == 0) { 2231147191Sjkoshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2232147191Sjkoshy atomic_add_rel_int(&pmc_ss_count, 1); 2233147191Sjkoshy PMCDBG(PMC,OPS,1, "po=%p in global list", po); 2234147191Sjkoshy } 2235147191Sjkoshy po->po_sscount++; 2236145256Sjkoshy } 2237145256Sjkoshy 2238145256Sjkoshy /* 2239147191Sjkoshy * Move to the CPU associated with this 2240145256Sjkoshy * PMC, and start the hardware. 2241145256Sjkoshy */ 2242145256Sjkoshy 2243145256Sjkoshy pmc_save_cpu_binding(&pb); 2244145256Sjkoshy 2245145774Sjkoshy cpu = PMC_TO_CPU(pm); 2246145256Sjkoshy 2247145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 2248145256Sjkoshy return ENXIO; 2249145256Sjkoshy 2250145256Sjkoshy pmc_select_cpu(cpu); 2251145256Sjkoshy 2252145256Sjkoshy /* 2253145256Sjkoshy * global PMCs are configured at allocation time 2254145256Sjkoshy * so write out the initial value and start the PMC. 2255145256Sjkoshy */ 2256145256Sjkoshy 2257147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2258147191Sjkoshy 2259145774Sjkoshy critical_enter(); 2260145256Sjkoshy if ((error = md->pmd_write_pmc(cpu, ri, 2261145774Sjkoshy PMC_IS_SAMPLING_MODE(mode) ? 2262145256Sjkoshy pm->pm_sc.pm_reloadcount : 2263145256Sjkoshy pm->pm_sc.pm_initial)) == 0) 2264145256Sjkoshy error = md->pmd_start_pmc(cpu, ri); 2265145774Sjkoshy critical_exit(); 2266145256Sjkoshy 2267145256Sjkoshy pmc_restore_cpu_binding(&pb); 2268145256Sjkoshy 2269145256Sjkoshy return error; 2270145256Sjkoshy} 2271145256Sjkoshy 2272145256Sjkoshy/* 2273145256Sjkoshy * Stop a PMC. 2274145256Sjkoshy */ 2275145256Sjkoshy 2276145256Sjkoshystatic int 2277145256Sjkoshypmc_stop(struct pmc *pm) 2278145256Sjkoshy{ 2279145774Sjkoshy int cpu, error, ri; 2280147191Sjkoshy struct pmc_owner *po; 2281145256Sjkoshy struct pmc_binding pb; 2282145256Sjkoshy 2283145256Sjkoshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2284145256Sjkoshy 2285145774Sjkoshy PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2286145774Sjkoshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2287145256Sjkoshy 2288145256Sjkoshy pm->pm_state = PMC_STATE_STOPPED; 2289145256Sjkoshy 2290145256Sjkoshy /* 2291145256Sjkoshy * If the PMC is a virtual mode one, changing the state to 2292145256Sjkoshy * non-RUNNING is enough to ensure that the PMC never gets 2293145256Sjkoshy * scheduled. 2294145256Sjkoshy * 2295145256Sjkoshy * If this PMC is current running on a CPU, then it will 2296145256Sjkoshy * handled correctly at the time its target process is context 2297145256Sjkoshy * switched out. 2298145256Sjkoshy */ 2299145256Sjkoshy 2300145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2301145256Sjkoshy return 0; 2302145256Sjkoshy 2303145256Sjkoshy /* 2304145256Sjkoshy * A system-mode PMC. Move to the CPU associated with 2305145256Sjkoshy * this PMC, and stop the hardware. We update the 2306145256Sjkoshy * 'initial count' so that a subsequent PMCSTART will 2307145256Sjkoshy * resume counting from the current hardware count. 2308145256Sjkoshy */ 2309145256Sjkoshy 2310145256Sjkoshy pmc_save_cpu_binding(&pb); 2311145256Sjkoshy 2312145774Sjkoshy cpu = PMC_TO_CPU(pm); 2313145256Sjkoshy 2314145774Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 2315145774Sjkoshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2316145774Sjkoshy 2317145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 2318145256Sjkoshy return ENXIO; 2319145256Sjkoshy 2320145256Sjkoshy pmc_select_cpu(cpu); 2321145256Sjkoshy 2322145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2323145256Sjkoshy 2324145774Sjkoshy critical_enter(); 2325145774Sjkoshy if ((error = md->pmd_stop_pmc(cpu, ri)) == 0) 2326145774Sjkoshy error = md->pmd_read_pmc(cpu, ri, &pm->pm_sc.pm_initial); 2327145774Sjkoshy critical_exit(); 2328145774Sjkoshy 2329145256Sjkoshy pmc_restore_cpu_binding(&pb); 2330145256Sjkoshy 2331147191Sjkoshy po = pm->pm_owner; 2332147191Sjkoshy 2333147191Sjkoshy /* remove this owner from the global list of SS PMC owners */ 2334147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2335147191Sjkoshy po->po_sscount--; 2336147191Sjkoshy if (po->po_sscount == 0) { 2337147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2338147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2339147191Sjkoshy PMCDBG(PMC,OPS,2,"po=%p removed from global list", po); 2340147191Sjkoshy } 2341147191Sjkoshy } 2342147191Sjkoshy 2343145256Sjkoshy return error; 2344145256Sjkoshy} 2345145256Sjkoshy 2346145256Sjkoshy 2347145256Sjkoshy#if DEBUG 2348145256Sjkoshystatic const char *pmc_op_to_name[] = { 2349145256Sjkoshy#undef __PMC_OP 2350145256Sjkoshy#define __PMC_OP(N, D) #N , 2351145256Sjkoshy __PMC_OPS() 2352145256Sjkoshy NULL 2353145256Sjkoshy}; 2354145256Sjkoshy#endif 2355145256Sjkoshy 2356145256Sjkoshy/* 2357145256Sjkoshy * The syscall interface 2358145256Sjkoshy */ 2359145256Sjkoshy 2360145256Sjkoshy#define PMC_GET_SX_XLOCK(...) do { \ 2361145256Sjkoshy sx_xlock(&pmc_sx); \ 2362145256Sjkoshy if (pmc_hook == NULL) { \ 2363145256Sjkoshy sx_xunlock(&pmc_sx); \ 2364145256Sjkoshy return __VA_ARGS__; \ 2365145256Sjkoshy } \ 2366145256Sjkoshy} while (0) 2367145256Sjkoshy 2368145256Sjkoshy#define PMC_DOWNGRADE_SX() do { \ 2369145256Sjkoshy sx_downgrade(&pmc_sx); \ 2370145256Sjkoshy is_sx_downgraded = 1; \ 2371145256Sjkoshy} while (0) 2372145256Sjkoshy 2373145256Sjkoshystatic int 2374145256Sjkoshypmc_syscall_handler(struct thread *td, void *syscall_args) 2375145256Sjkoshy{ 2376145256Sjkoshy int error, is_sx_downgraded, op; 2377145256Sjkoshy struct pmc_syscall_args *c; 2378145256Sjkoshy void *arg; 2379145256Sjkoshy 2380145256Sjkoshy PMC_GET_SX_XLOCK(ENOSYS); 2381145256Sjkoshy 2382147191Sjkoshy DROP_GIANT(); 2383147191Sjkoshy 2384145256Sjkoshy is_sx_downgraded = 0; 2385145256Sjkoshy 2386145256Sjkoshy c = (struct pmc_syscall_args *) syscall_args; 2387145256Sjkoshy 2388145256Sjkoshy op = c->pmop_code; 2389145256Sjkoshy arg = c->pmop_data; 2390145256Sjkoshy 2391145256Sjkoshy PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2392145256Sjkoshy pmc_op_to_name[op], arg); 2393145256Sjkoshy 2394145256Sjkoshy error = 0; 2395145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2396145256Sjkoshy 2397145256Sjkoshy switch(op) 2398145256Sjkoshy { 2399145256Sjkoshy 2400145256Sjkoshy 2401145256Sjkoshy /* 2402145256Sjkoshy * Configure a log file. 2403145256Sjkoshy * 2404145256Sjkoshy * XXX This OP will be reworked. 2405145256Sjkoshy */ 2406145256Sjkoshy 2407145256Sjkoshy case PMC_OP_CONFIGURELOG: 2408145256Sjkoshy { 2409145256Sjkoshy struct pmc_owner *po; 2410145256Sjkoshy struct pmc_op_configurelog cl; 2411145256Sjkoshy struct proc *p; 2412145256Sjkoshy 2413145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2414145256Sjkoshy 2415145256Sjkoshy if ((error = copyin(arg, &cl, sizeof(cl))) != 0) 2416145256Sjkoshy break; 2417145256Sjkoshy 2418145256Sjkoshy /* mark this process as owning a log file */ 2419145256Sjkoshy p = td->td_proc; 2420145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2421147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2422147191Sjkoshy error = ENOMEM; 2423147191Sjkoshy break; 2424147191Sjkoshy } 2425145256Sjkoshy 2426147191Sjkoshy /* 2427147191Sjkoshy * If a valid fd was passed in, try to configure that, 2428147191Sjkoshy * otherwise if 'fd' was less than zero and there was 2429147191Sjkoshy * a log file configured, flush its buffers and 2430147191Sjkoshy * de-configure it. 2431147191Sjkoshy */ 2432147191Sjkoshy if (cl.pm_logfd >= 0) 2433147191Sjkoshy error = pmclog_configure_log(po, cl.pm_logfd); 2434147191Sjkoshy else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2435147191Sjkoshy pmclog_process_closelog(po); 2436147191Sjkoshy error = pmclog_flush(po); 2437147191Sjkoshy if (error == 0) 2438147191Sjkoshy error = pmclog_deconfigure_log(po); 2439147191Sjkoshy } else 2440147191Sjkoshy error = EINVAL; 2441147191Sjkoshy } 2442147191Sjkoshy break; 2443147191Sjkoshy 2444147191Sjkoshy 2445147191Sjkoshy /* 2446147191Sjkoshy * Flush a log file. 2447147191Sjkoshy */ 2448147191Sjkoshy 2449147191Sjkoshy case PMC_OP_FLUSHLOG: 2450147191Sjkoshy { 2451147191Sjkoshy struct pmc_owner *po; 2452147191Sjkoshy 2453147191Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2454147191Sjkoshy 2455147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2456147191Sjkoshy error = EINVAL; 2457145256Sjkoshy break; 2458147191Sjkoshy } 2459145256Sjkoshy 2460147191Sjkoshy error = pmclog_flush(po); 2461145256Sjkoshy } 2462145256Sjkoshy break; 2463145256Sjkoshy 2464145256Sjkoshy /* 2465145256Sjkoshy * Retrieve hardware configuration. 2466145256Sjkoshy */ 2467145256Sjkoshy 2468145256Sjkoshy case PMC_OP_GETCPUINFO: /* CPU information */ 2469145256Sjkoshy { 2470145256Sjkoshy struct pmc_op_getcpuinfo gci; 2471145256Sjkoshy 2472145256Sjkoshy gci.pm_cputype = md->pmd_cputype; 2473145774Sjkoshy gci.pm_ncpu = mp_ncpus; 2474145256Sjkoshy gci.pm_npmc = md->pmd_npmc; 2475145256Sjkoshy gci.pm_nclass = md->pmd_nclass; 2476145256Sjkoshy bcopy(md->pmd_classes, &gci.pm_classes, 2477145256Sjkoshy sizeof(gci.pm_classes)); 2478145256Sjkoshy error = copyout(&gci, arg, sizeof(gci)); 2479145256Sjkoshy } 2480145256Sjkoshy break; 2481145256Sjkoshy 2482145256Sjkoshy 2483145256Sjkoshy /* 2484145256Sjkoshy * Get module statistics 2485145256Sjkoshy */ 2486145256Sjkoshy 2487145256Sjkoshy case PMC_OP_GETDRIVERSTATS: 2488145256Sjkoshy { 2489145256Sjkoshy struct pmc_op_getdriverstats gms; 2490145256Sjkoshy 2491145256Sjkoshy bcopy(&pmc_stats, &gms, sizeof(gms)); 2492145256Sjkoshy error = copyout(&gms, arg, sizeof(gms)); 2493145256Sjkoshy } 2494145256Sjkoshy break; 2495145256Sjkoshy 2496145256Sjkoshy 2497145256Sjkoshy /* 2498145256Sjkoshy * Retrieve module version number 2499145256Sjkoshy */ 2500145256Sjkoshy 2501145256Sjkoshy case PMC_OP_GETMODULEVERSION: 2502145256Sjkoshy { 2503147191Sjkoshy uint32_t cv, modv; 2504147191Sjkoshy 2505147191Sjkoshy /* retrieve the client's idea of the ABI version */ 2506147191Sjkoshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 2507147191Sjkoshy break; 2508147191Sjkoshy /* don't service clients newer than our driver */ 2509147191Sjkoshy modv = PMC_VERSION; 2510147191Sjkoshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 2511147191Sjkoshy error = EPROGMISMATCH; 2512147191Sjkoshy break; 2513147191Sjkoshy } 2514147191Sjkoshy error = copyout(&modv, arg, sizeof(int)); 2515145256Sjkoshy } 2516145256Sjkoshy break; 2517145256Sjkoshy 2518145256Sjkoshy 2519145256Sjkoshy /* 2520145256Sjkoshy * Retrieve the state of all the PMCs on a given 2521145256Sjkoshy * CPU. 2522145256Sjkoshy */ 2523145256Sjkoshy 2524145256Sjkoshy case PMC_OP_GETPMCINFO: 2525145256Sjkoshy { 2526145256Sjkoshy uint32_t cpu, n, npmc; 2527145256Sjkoshy size_t pmcinfo_size; 2528145256Sjkoshy struct pmc *pm; 2529145256Sjkoshy struct pmc_info *p, *pmcinfo; 2530145256Sjkoshy struct pmc_op_getpmcinfo *gpi; 2531145256Sjkoshy struct pmc_owner *po; 2532145256Sjkoshy struct pmc_binding pb; 2533145256Sjkoshy 2534145256Sjkoshy PMC_DOWNGRADE_SX(); 2535145256Sjkoshy 2536145256Sjkoshy gpi = (struct pmc_op_getpmcinfo *) arg; 2537145256Sjkoshy 2538145256Sjkoshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 2539145256Sjkoshy break; 2540145256Sjkoshy 2541145256Sjkoshy if (cpu >= (unsigned int) mp_ncpus) { 2542145256Sjkoshy error = EINVAL; 2543145256Sjkoshy break; 2544145256Sjkoshy } 2545145256Sjkoshy 2546145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 2547145256Sjkoshy error = ENXIO; 2548145256Sjkoshy break; 2549145256Sjkoshy } 2550145256Sjkoshy 2551145256Sjkoshy /* switch to CPU 'cpu' */ 2552145256Sjkoshy pmc_save_cpu_binding(&pb); 2553145256Sjkoshy pmc_select_cpu(cpu); 2554145256Sjkoshy 2555145256Sjkoshy npmc = md->pmd_npmc; 2556145256Sjkoshy 2557145256Sjkoshy pmcinfo_size = npmc * sizeof(struct pmc_info); 2558145256Sjkoshy MALLOC(pmcinfo, struct pmc_info *, pmcinfo_size, M_PMC, 2559145256Sjkoshy M_WAITOK); 2560145256Sjkoshy 2561145256Sjkoshy p = pmcinfo; 2562145256Sjkoshy 2563145256Sjkoshy for (n = 0; n < md->pmd_npmc; n++, p++) { 2564145256Sjkoshy 2565145256Sjkoshy if ((error = md->pmd_describe(cpu, n, p, &pm)) != 0) 2566145256Sjkoshy break; 2567145256Sjkoshy 2568145256Sjkoshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 2569145256Sjkoshy p->pm_rowdisp = PMC_DISP_STANDALONE; 2570145256Sjkoshy else if (PMC_ROW_DISP_IS_THREAD(n)) 2571145256Sjkoshy p->pm_rowdisp = PMC_DISP_THREAD; 2572145256Sjkoshy else 2573145256Sjkoshy p->pm_rowdisp = PMC_DISP_FREE; 2574145256Sjkoshy 2575145256Sjkoshy p->pm_ownerpid = -1; 2576145256Sjkoshy 2577145256Sjkoshy if (pm == NULL) /* no PMC associated */ 2578145256Sjkoshy continue; 2579145256Sjkoshy 2580145256Sjkoshy po = pm->pm_owner; 2581145256Sjkoshy 2582145256Sjkoshy KASSERT(po->po_owner != NULL, 2583145256Sjkoshy ("[pmc,%d] pmc_owner had a null proc pointer", 2584145256Sjkoshy __LINE__)); 2585145256Sjkoshy 2586145256Sjkoshy p->pm_ownerpid = po->po_owner->p_pid; 2587145774Sjkoshy p->pm_mode = PMC_TO_MODE(pm); 2588145256Sjkoshy p->pm_event = pm->pm_event; 2589145256Sjkoshy p->pm_flags = pm->pm_flags; 2590145256Sjkoshy 2591145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2592145256Sjkoshy p->pm_reloadcount = 2593145256Sjkoshy pm->pm_sc.pm_reloadcount; 2594145256Sjkoshy } 2595145256Sjkoshy 2596145256Sjkoshy pmc_restore_cpu_binding(&pb); 2597145256Sjkoshy 2598145256Sjkoshy /* now copy out the PMC info collected */ 2599145256Sjkoshy if (error == 0) 2600145256Sjkoshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 2601145256Sjkoshy 2602145256Sjkoshy FREE(pmcinfo, M_PMC); 2603145256Sjkoshy } 2604145256Sjkoshy break; 2605145256Sjkoshy 2606145256Sjkoshy 2607145256Sjkoshy /* 2608145256Sjkoshy * Set the administrative state of a PMC. I.e. whether 2609145256Sjkoshy * the PMC is to be used or not. 2610145256Sjkoshy */ 2611145256Sjkoshy 2612145256Sjkoshy case PMC_OP_PMCADMIN: 2613145256Sjkoshy { 2614145256Sjkoshy int cpu, ri; 2615145256Sjkoshy enum pmc_state request; 2616145256Sjkoshy struct pmc_cpu *pc; 2617145256Sjkoshy struct pmc_hw *phw; 2618145256Sjkoshy struct pmc_op_pmcadmin pma; 2619145256Sjkoshy struct pmc_binding pb; 2620145256Sjkoshy 2621145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2622145256Sjkoshy 2623145256Sjkoshy KASSERT(td == curthread, 2624145256Sjkoshy ("[pmc,%d] td != curthread", __LINE__)); 2625145256Sjkoshy 2626145256Sjkoshy if (suser(td) || jailed(td->td_ucred)) { 2627145256Sjkoshy error = EPERM; 2628145256Sjkoshy break; 2629145256Sjkoshy } 2630145256Sjkoshy 2631145256Sjkoshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 2632145256Sjkoshy break; 2633145256Sjkoshy 2634145256Sjkoshy cpu = pma.pm_cpu; 2635145256Sjkoshy 2636145256Sjkoshy if (cpu < 0 || cpu >= mp_ncpus) { 2637145256Sjkoshy error = EINVAL; 2638145256Sjkoshy break; 2639145256Sjkoshy } 2640145256Sjkoshy 2641145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 2642145256Sjkoshy error = ENXIO; 2643145256Sjkoshy break; 2644145256Sjkoshy } 2645145256Sjkoshy 2646145256Sjkoshy request = pma.pm_state; 2647145256Sjkoshy 2648145256Sjkoshy if (request != PMC_STATE_DISABLED && 2649145256Sjkoshy request != PMC_STATE_FREE) { 2650145256Sjkoshy error = EINVAL; 2651145256Sjkoshy break; 2652145256Sjkoshy } 2653145256Sjkoshy 2654145256Sjkoshy ri = pma.pm_pmc; /* pmc id == row index */ 2655145256Sjkoshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 2656145256Sjkoshy error = EINVAL; 2657145256Sjkoshy break; 2658145256Sjkoshy } 2659145256Sjkoshy 2660145256Sjkoshy /* 2661145256Sjkoshy * We can't disable a PMC with a row-index allocated 2662145256Sjkoshy * for process virtual PMCs. 2663145256Sjkoshy */ 2664145256Sjkoshy 2665145256Sjkoshy if (PMC_ROW_DISP_IS_THREAD(ri) && 2666145256Sjkoshy request == PMC_STATE_DISABLED) { 2667145256Sjkoshy error = EBUSY; 2668145256Sjkoshy break; 2669145256Sjkoshy } 2670145256Sjkoshy 2671145256Sjkoshy /* 2672145256Sjkoshy * otherwise, this PMC on this CPU is either free or 2673145256Sjkoshy * in system-wide mode. 2674145256Sjkoshy */ 2675145256Sjkoshy 2676145256Sjkoshy pmc_save_cpu_binding(&pb); 2677145256Sjkoshy pmc_select_cpu(cpu); 2678145256Sjkoshy 2679145256Sjkoshy pc = pmc_pcpu[cpu]; 2680145256Sjkoshy phw = pc->pc_hwpmcs[ri]; 2681145256Sjkoshy 2682145256Sjkoshy /* 2683145256Sjkoshy * XXX do we need some kind of 'forced' disable? 2684145256Sjkoshy */ 2685145256Sjkoshy 2686145256Sjkoshy if (phw->phw_pmc == NULL) { 2687145256Sjkoshy if (request == PMC_STATE_DISABLED && 2688145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 2689145256Sjkoshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 2690145256Sjkoshy PMC_MARK_ROW_STANDALONE(ri); 2691145256Sjkoshy } else if (request == PMC_STATE_FREE && 2692145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 2693145256Sjkoshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 2694145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2695145256Sjkoshy } 2696145256Sjkoshy /* other cases are a no-op */ 2697145256Sjkoshy } else 2698145256Sjkoshy error = EBUSY; 2699145256Sjkoshy 2700145256Sjkoshy pmc_restore_cpu_binding(&pb); 2701145256Sjkoshy } 2702145256Sjkoshy break; 2703145256Sjkoshy 2704145256Sjkoshy 2705145256Sjkoshy /* 2706145256Sjkoshy * Allocate a PMC. 2707145256Sjkoshy */ 2708145256Sjkoshy 2709145256Sjkoshy case PMC_OP_PMCALLOCATE: 2710145256Sjkoshy { 2711145256Sjkoshy uint32_t caps; 2712145256Sjkoshy u_int cpu; 2713145256Sjkoshy int n; 2714145256Sjkoshy enum pmc_mode mode; 2715145256Sjkoshy struct pmc *pmc; 2716145774Sjkoshy struct pmc_hw *phw; 2717145256Sjkoshy struct pmc_op_pmcallocate pa; 2718145256Sjkoshy struct pmc_binding pb; 2719145256Sjkoshy 2720145256Sjkoshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 2721145256Sjkoshy break; 2722145256Sjkoshy 2723145256Sjkoshy caps = pa.pm_caps; 2724145256Sjkoshy mode = pa.pm_mode; 2725145256Sjkoshy cpu = pa.pm_cpu; 2726145256Sjkoshy 2727145256Sjkoshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 2728145256Sjkoshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 2729145256Sjkoshy (cpu != (u_int) PMC_CPU_ANY && cpu >= (u_int) mp_ncpus)) { 2730145256Sjkoshy error = EINVAL; 2731145256Sjkoshy break; 2732145256Sjkoshy } 2733145256Sjkoshy 2734145256Sjkoshy /* 2735145256Sjkoshy * Virtual PMCs should only ask for a default CPU. 2736145256Sjkoshy * System mode PMCs need to specify a non-default CPU. 2737145256Sjkoshy */ 2738145256Sjkoshy 2739145256Sjkoshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 2740145256Sjkoshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 2741145256Sjkoshy error = EINVAL; 2742145256Sjkoshy break; 2743145256Sjkoshy } 2744145256Sjkoshy 2745145256Sjkoshy /* 2746145256Sjkoshy * Check that a disabled CPU is not being asked for. 2747145256Sjkoshy */ 2748145256Sjkoshy 2749145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && pmc_cpu_is_disabled(cpu)) { 2750145256Sjkoshy error = ENXIO; 2751145256Sjkoshy break; 2752145256Sjkoshy } 2753145256Sjkoshy 2754145256Sjkoshy /* 2755145256Sjkoshy * Refuse an allocation for a system-wide PMC if this 2756145256Sjkoshy * process has been jailed, or if this process lacks 2757145256Sjkoshy * super-user credentials and the sysctl tunable 2758145256Sjkoshy * 'security.bsd.unprivileged_syspmcs' is zero. 2759145256Sjkoshy */ 2760145256Sjkoshy 2761145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2762145256Sjkoshy if (jailed(curthread->td_ucred)) 2763145256Sjkoshy error = EPERM; 2764145256Sjkoshy else if (suser(curthread) && 2765145256Sjkoshy (pmc_unprivileged_syspmcs == 0)) 2766145256Sjkoshy error = EPERM; 2767145256Sjkoshy } 2768145256Sjkoshy 2769145256Sjkoshy if (error) 2770145256Sjkoshy break; 2771145256Sjkoshy 2772145256Sjkoshy /* 2773145256Sjkoshy * Look for valid values for 'pm_flags' 2774145256Sjkoshy */ 2775145256Sjkoshy 2776147191Sjkoshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 2777147191Sjkoshy PMC_F_LOG_PROCEXIT)) != 0) { 2778145256Sjkoshy error = EINVAL; 2779145256Sjkoshy break; 2780145256Sjkoshy } 2781145256Sjkoshy 2782147191Sjkoshy /* process logging options are not allowed for system PMCs */ 2783147191Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 2784147191Sjkoshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 2785147191Sjkoshy error = EINVAL; 2786147191Sjkoshy break; 2787147191Sjkoshy } 2788147191Sjkoshy 2789145256Sjkoshy /* 2790145256Sjkoshy * All sampling mode PMCs need to be able to interrupt the 2791145256Sjkoshy * CPU. 2792145256Sjkoshy */ 2793145256Sjkoshy 2794147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode)) 2795145256Sjkoshy caps |= PMC_CAP_INTERRUPT; 2796145256Sjkoshy 2797145256Sjkoshy PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 2798145256Sjkoshy pa.pm_ev, caps, mode, cpu); 2799145256Sjkoshy 2800145256Sjkoshy pmc = pmc_allocate_pmc_descriptor(); 2801145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 2802145774Sjkoshy PMC_ID_INVALID); 2803145256Sjkoshy pmc->pm_event = pa.pm_ev; 2804145256Sjkoshy pmc->pm_state = PMC_STATE_FREE; 2805145256Sjkoshy pmc->pm_caps = caps; 2806145256Sjkoshy pmc->pm_flags = pa.pm_flags; 2807145256Sjkoshy 2808145256Sjkoshy /* switch thread to CPU 'cpu' */ 2809145256Sjkoshy pmc_save_cpu_binding(&pb); 2810145256Sjkoshy 2811145256Sjkoshy#define PMC_IS_SHAREABLE_PMC(cpu, n) \ 2812145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 2813145256Sjkoshy PMC_PHW_FLAG_IS_SHAREABLE) 2814145256Sjkoshy#define PMC_IS_UNALLOCATED(cpu, n) \ 2815145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 2816145256Sjkoshy 2817145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2818145256Sjkoshy pmc_select_cpu(cpu); 2819145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 2820145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 2821145256Sjkoshy pmc_can_allocate_rowindex( 2822145774Sjkoshy curthread->td_proc, n, cpu) == 0 && 2823145256Sjkoshy (PMC_IS_UNALLOCATED(cpu, n) || 2824145256Sjkoshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 2825145256Sjkoshy md->pmd_allocate_pmc(cpu, n, pmc, 2826145256Sjkoshy &pa) == 0) 2827145256Sjkoshy break; 2828145256Sjkoshy } else { 2829145256Sjkoshy /* Process virtual mode */ 2830145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 2831145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 2832145256Sjkoshy pmc_can_allocate_rowindex( 2833145774Sjkoshy curthread->td_proc, n, 2834145774Sjkoshy PMC_CPU_ANY) == 0 && 2835145256Sjkoshy md->pmd_allocate_pmc(curthread->td_oncpu, 2836145256Sjkoshy n, pmc, &pa) == 0) 2837145256Sjkoshy break; 2838145256Sjkoshy } 2839145256Sjkoshy } 2840145256Sjkoshy 2841145256Sjkoshy#undef PMC_IS_UNALLOCATED 2842145256Sjkoshy#undef PMC_IS_SHAREABLE_PMC 2843145256Sjkoshy 2844145256Sjkoshy pmc_restore_cpu_binding(&pb); 2845145256Sjkoshy 2846145256Sjkoshy if (n == (int) md->pmd_npmc) { 2847145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 2848145256Sjkoshy FREE(pmc, M_PMC); 2849145256Sjkoshy pmc = NULL; 2850145256Sjkoshy error = EINVAL; 2851145256Sjkoshy break; 2852145256Sjkoshy } 2853145256Sjkoshy 2854145774Sjkoshy /* Fill in the correct value in the ID field */ 2855145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 2856145256Sjkoshy 2857145774Sjkoshy PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 2858145774Sjkoshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 2859145774Sjkoshy 2860147191Sjkoshy /* Process mode PMCs with logging enabled need log files */ 2861147191Sjkoshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 2862147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 2863147191Sjkoshy 2864147191Sjkoshy /* All system mode sampling PMCs require a log file */ 2865147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 2866147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 2867147191Sjkoshy 2868145256Sjkoshy /* 2869145256Sjkoshy * Configure global pmc's immediately 2870145256Sjkoshy */ 2871145256Sjkoshy 2872145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 2873145774Sjkoshy 2874145774Sjkoshy pmc_save_cpu_binding(&pb); 2875145774Sjkoshy pmc_select_cpu(cpu); 2876145774Sjkoshy 2877145774Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 2878145774Sjkoshy 2879145774Sjkoshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 2880145774Sjkoshy (error = md->pmd_config_pmc(cpu, n, pmc)) != 0) { 2881145256Sjkoshy (void) md->pmd_release_pmc(cpu, n, pmc); 2882145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 2883145256Sjkoshy FREE(pmc, M_PMC); 2884145256Sjkoshy pmc = NULL; 2885145774Sjkoshy pmc_restore_cpu_binding(&pb); 2886145774Sjkoshy error = EPERM; 2887145256Sjkoshy break; 2888145256Sjkoshy } 2889145256Sjkoshy 2890145774Sjkoshy pmc_restore_cpu_binding(&pb); 2891145774Sjkoshy } 2892145256Sjkoshy 2893145256Sjkoshy pmc->pm_state = PMC_STATE_ALLOCATED; 2894145256Sjkoshy 2895145256Sjkoshy /* 2896145256Sjkoshy * mark row disposition 2897145256Sjkoshy */ 2898145256Sjkoshy 2899145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2900145256Sjkoshy PMC_MARK_ROW_STANDALONE(n); 2901145256Sjkoshy else 2902145256Sjkoshy PMC_MARK_ROW_THREAD(n); 2903145256Sjkoshy 2904145256Sjkoshy /* 2905145256Sjkoshy * Register this PMC with the current thread as its owner. 2906145256Sjkoshy */ 2907145256Sjkoshy 2908145256Sjkoshy if ((error = 2909145256Sjkoshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 2910145256Sjkoshy pmc_release_pmc_descriptor(pmc); 2911145256Sjkoshy FREE(pmc, M_PMC); 2912145256Sjkoshy pmc = NULL; 2913145256Sjkoshy break; 2914145256Sjkoshy } 2915145256Sjkoshy 2916145256Sjkoshy /* 2917145256Sjkoshy * Return the allocated index. 2918145256Sjkoshy */ 2919145256Sjkoshy 2920145774Sjkoshy pa.pm_pmcid = pmc->pm_id; 2921145256Sjkoshy 2922145256Sjkoshy error = copyout(&pa, arg, sizeof(pa)); 2923145256Sjkoshy } 2924145256Sjkoshy break; 2925145256Sjkoshy 2926145256Sjkoshy 2927145256Sjkoshy /* 2928145256Sjkoshy * Attach a PMC to a process. 2929145256Sjkoshy */ 2930145256Sjkoshy 2931145256Sjkoshy case PMC_OP_PMCATTACH: 2932145256Sjkoshy { 2933145256Sjkoshy struct pmc *pm; 2934145256Sjkoshy struct proc *p; 2935145256Sjkoshy struct pmc_op_pmcattach a; 2936145256Sjkoshy 2937145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2938145256Sjkoshy 2939145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 2940145256Sjkoshy break; 2941145256Sjkoshy 2942145256Sjkoshy if (a.pm_pid < 0) { 2943145256Sjkoshy error = EINVAL; 2944145256Sjkoshy break; 2945145256Sjkoshy } else if (a.pm_pid == 0) 2946145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 2947145256Sjkoshy 2948145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 2949145256Sjkoshy break; 2950145256Sjkoshy 2951145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 2952145256Sjkoshy error = EINVAL; 2953145256Sjkoshy break; 2954145256Sjkoshy } 2955145256Sjkoshy 2956145256Sjkoshy /* PMCs may be (re)attached only when allocated or stopped */ 2957145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 2958145256Sjkoshy error = EBUSY; 2959145256Sjkoshy break; 2960145256Sjkoshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 2961145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED) { 2962145256Sjkoshy error = EINVAL; 2963145256Sjkoshy break; 2964145256Sjkoshy } 2965145256Sjkoshy 2966145256Sjkoshy /* lookup pid */ 2967145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 2968145256Sjkoshy error = ESRCH; 2969145256Sjkoshy break; 2970145256Sjkoshy } 2971145256Sjkoshy 2972145256Sjkoshy /* 2973145256Sjkoshy * Ignore processes that are working on exiting. 2974145256Sjkoshy */ 2975145256Sjkoshy if (p->p_flag & P_WEXIT) { 2976145256Sjkoshy error = ESRCH; 2977145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 2978145256Sjkoshy break; 2979145256Sjkoshy } 2980145256Sjkoshy 2981145256Sjkoshy /* 2982145256Sjkoshy * we are allowed to attach a PMC to a process if 2983145256Sjkoshy * we can debug it. 2984145256Sjkoshy */ 2985145256Sjkoshy error = p_candebug(curthread, p); 2986145256Sjkoshy 2987145256Sjkoshy PROC_UNLOCK(p); 2988145256Sjkoshy 2989145256Sjkoshy if (error == 0) 2990145256Sjkoshy error = pmc_attach_process(p, pm); 2991145256Sjkoshy } 2992145256Sjkoshy break; 2993145256Sjkoshy 2994145256Sjkoshy 2995145256Sjkoshy /* 2996145256Sjkoshy * Detach an attached PMC from a process. 2997145256Sjkoshy */ 2998145256Sjkoshy 2999145256Sjkoshy case PMC_OP_PMCDETACH: 3000145256Sjkoshy { 3001145256Sjkoshy struct pmc *pm; 3002145256Sjkoshy struct proc *p; 3003145256Sjkoshy struct pmc_op_pmcattach a; 3004145256Sjkoshy 3005145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3006145256Sjkoshy break; 3007145256Sjkoshy 3008145256Sjkoshy if (a.pm_pid < 0) { 3009145256Sjkoshy error = EINVAL; 3010145256Sjkoshy break; 3011145256Sjkoshy } else if (a.pm_pid == 0) 3012145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3013145256Sjkoshy 3014145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3015145256Sjkoshy break; 3016145256Sjkoshy 3017145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3018145256Sjkoshy error = ESRCH; 3019145256Sjkoshy break; 3020145256Sjkoshy } 3021145256Sjkoshy 3022145256Sjkoshy /* 3023145256Sjkoshy * Treat processes that are in the process of exiting 3024145256Sjkoshy * as if they were not present. 3025145256Sjkoshy */ 3026145256Sjkoshy 3027145256Sjkoshy if (p->p_flag & P_WEXIT) 3028145256Sjkoshy error = ESRCH; 3029145256Sjkoshy 3030145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3031145256Sjkoshy 3032145256Sjkoshy if (error == 0) 3033145256Sjkoshy error = pmc_detach_process(p, pm); 3034145256Sjkoshy } 3035145256Sjkoshy break; 3036145256Sjkoshy 3037145256Sjkoshy 3038145256Sjkoshy /* 3039147191Sjkoshy * Retrieve the MSR number associated with the counter 3040147191Sjkoshy * 'pmc_id'. This allows processes to directly use RDPMC 3041147191Sjkoshy * instructions to read their PMCs, without the overhead of a 3042147191Sjkoshy * system call. 3043147191Sjkoshy */ 3044147191Sjkoshy 3045147191Sjkoshy case PMC_OP_PMCGETMSR: 3046147191Sjkoshy { 3047147191Sjkoshy int ri; 3048147191Sjkoshy struct pmc *pm; 3049147191Sjkoshy struct pmc_target *pt; 3050147191Sjkoshy struct pmc_op_getmsr gm; 3051147191Sjkoshy 3052147191Sjkoshy PMC_DOWNGRADE_SX(); 3053147191Sjkoshy 3054147191Sjkoshy /* CPU has no 'GETMSR' support */ 3055147191Sjkoshy if (md->pmd_get_msr == NULL) { 3056147191Sjkoshy error = ENOSYS; 3057147191Sjkoshy break; 3058147191Sjkoshy } 3059147191Sjkoshy 3060147191Sjkoshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3061147191Sjkoshy break; 3062147191Sjkoshy 3063147191Sjkoshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3064147191Sjkoshy break; 3065147191Sjkoshy 3066147191Sjkoshy /* 3067147191Sjkoshy * The allocated PMC has to be a process virtual PMC, 3068147191Sjkoshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3069147191Sjkoshy * read using the PMCREAD operation since they may be 3070147191Sjkoshy * allocated on a different CPU than the one we could 3071147191Sjkoshy * be running on at the time of the RDPMC instruction. 3072147191Sjkoshy * 3073147191Sjkoshy * The GETMSR operation is not allowed for PMCs that 3074147191Sjkoshy * are inherited across processes. 3075147191Sjkoshy */ 3076147191Sjkoshy 3077147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3078147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3079147191Sjkoshy error = EINVAL; 3080147191Sjkoshy break; 3081147191Sjkoshy } 3082147191Sjkoshy 3083147191Sjkoshy /* 3084147191Sjkoshy * It only makes sense to use a RDPMC (or its 3085147191Sjkoshy * equivalent instruction on non-x86 architectures) on 3086147191Sjkoshy * a process that has allocated and attached a PMC to 3087147191Sjkoshy * itself. Conversely the PMC is only allowed to have 3088147191Sjkoshy * one process attached to it -- its owner. 3089147191Sjkoshy */ 3090147191Sjkoshy 3091147191Sjkoshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3092147191Sjkoshy LIST_NEXT(pt, pt_next) != NULL || 3093147191Sjkoshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3094147191Sjkoshy error = EINVAL; 3095147191Sjkoshy break; 3096147191Sjkoshy } 3097147191Sjkoshy 3098147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3099147191Sjkoshy 3100147191Sjkoshy if ((error = (*md->pmd_get_msr)(ri, &gm.pm_msr)) < 0) 3101147191Sjkoshy break; 3102147191Sjkoshy 3103147191Sjkoshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3104147191Sjkoshy break; 3105147191Sjkoshy 3106147191Sjkoshy /* 3107147191Sjkoshy * Mark our process as using MSRs. Update machine 3108147191Sjkoshy * state using a forced context switch. 3109147191Sjkoshy */ 3110147191Sjkoshy 3111147191Sjkoshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3112147191Sjkoshy pmc_force_context_switch(); 3113147191Sjkoshy 3114147191Sjkoshy } 3115147191Sjkoshy break; 3116147191Sjkoshy 3117147191Sjkoshy /* 3118145256Sjkoshy * Release an allocated PMC 3119145256Sjkoshy */ 3120145256Sjkoshy 3121145256Sjkoshy case PMC_OP_PMCRELEASE: 3122145256Sjkoshy { 3123145256Sjkoshy pmc_id_t pmcid; 3124145256Sjkoshy struct pmc *pm; 3125145256Sjkoshy struct pmc_owner *po; 3126145256Sjkoshy struct pmc_op_simple sp; 3127145256Sjkoshy 3128145256Sjkoshy /* 3129145256Sjkoshy * Find PMC pointer for the named PMC. 3130145256Sjkoshy * 3131145256Sjkoshy * Use pmc_release_pmc_descriptor() to switch off the 3132145256Sjkoshy * PMC, remove all its target threads, and remove the 3133145256Sjkoshy * PMC from its owner's list. 3134145256Sjkoshy * 3135145256Sjkoshy * Remove the owner record if this is the last PMC 3136145256Sjkoshy * owned. 3137145256Sjkoshy * 3138145256Sjkoshy * Free up space. 3139145256Sjkoshy */ 3140145256Sjkoshy 3141145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3142145256Sjkoshy break; 3143145256Sjkoshy 3144145256Sjkoshy pmcid = sp.pm_pmcid; 3145145256Sjkoshy 3146145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3147145256Sjkoshy break; 3148145256Sjkoshy 3149145256Sjkoshy po = pm->pm_owner; 3150145256Sjkoshy pmc_release_pmc_descriptor(pm); 3151145256Sjkoshy pmc_maybe_remove_owner(po); 3152145256Sjkoshy 3153145256Sjkoshy FREE(pm, M_PMC); 3154145256Sjkoshy } 3155145256Sjkoshy break; 3156145256Sjkoshy 3157145256Sjkoshy 3158145256Sjkoshy /* 3159145256Sjkoshy * Read and/or write a PMC. 3160145256Sjkoshy */ 3161145256Sjkoshy 3162145256Sjkoshy case PMC_OP_PMCRW: 3163145256Sjkoshy { 3164145256Sjkoshy uint32_t cpu, ri; 3165145256Sjkoshy struct pmc *pm; 3166145256Sjkoshy struct pmc_op_pmcrw *pprw; 3167145256Sjkoshy struct pmc_op_pmcrw prw; 3168145256Sjkoshy struct pmc_binding pb; 3169145256Sjkoshy pmc_value_t oldvalue; 3170145256Sjkoshy 3171145256Sjkoshy PMC_DOWNGRADE_SX(); 3172145256Sjkoshy 3173145256Sjkoshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3174145256Sjkoshy break; 3175145256Sjkoshy 3176145301Simp ri = 0; 3177145256Sjkoshy PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3178145256Sjkoshy prw.pm_flags); 3179145256Sjkoshy 3180145256Sjkoshy /* must have at least one flag set */ 3181145256Sjkoshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3182145256Sjkoshy error = EINVAL; 3183145256Sjkoshy break; 3184145256Sjkoshy } 3185145256Sjkoshy 3186145256Sjkoshy /* locate pmc descriptor */ 3187145256Sjkoshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3188145256Sjkoshy break; 3189145256Sjkoshy 3190145256Sjkoshy /* Can't read a PMC that hasn't been started. */ 3191145256Sjkoshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3192145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED && 3193145256Sjkoshy pm->pm_state != PMC_STATE_RUNNING) { 3194145256Sjkoshy error = EINVAL; 3195145256Sjkoshy break; 3196145256Sjkoshy } 3197145256Sjkoshy 3198145256Sjkoshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3199145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3200145256Sjkoshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3201145256Sjkoshy error = EBUSY; 3202145256Sjkoshy break; 3203145256Sjkoshy } 3204145256Sjkoshy 3205145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3206145256Sjkoshy 3207145774Sjkoshy /* 3208145774Sjkoshy * If this PMC is attached to its owner (i.e., 3209145774Sjkoshy * the process requesting this operation) and 3210145774Sjkoshy * is running, then attempt to get an 3211145774Sjkoshy * upto-date reading from hardware for a READ. 3212145774Sjkoshy * Writes are only allowed when the PMC is 3213145774Sjkoshy * stopped, so only update the saved value 3214145774Sjkoshy * field. 3215145774Sjkoshy * 3216145774Sjkoshy * If the PMC is not running, or is not 3217145774Sjkoshy * attached to its owner, read/write to the 3218145774Sjkoshy * savedvalue field. 3219145774Sjkoshy */ 3220145774Sjkoshy 3221145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3222145774Sjkoshy 3223145256Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3224145774Sjkoshy cpu = curthread->td_oncpu; 3225145774Sjkoshy 3226145774Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3227145774Sjkoshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3228145774Sjkoshy (pm->pm_state == PMC_STATE_RUNNING)) 3229145774Sjkoshy error = (*md->pmd_read_pmc)(cpu, ri, 3230145774Sjkoshy &oldvalue); 3231145774Sjkoshy else 3232145774Sjkoshy oldvalue = pm->pm_gv.pm_savedvalue; 3233145774Sjkoshy } 3234145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3235145256Sjkoshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3236145774Sjkoshy 3237145256Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3238145256Sjkoshy 3239145256Sjkoshy } else { /* System mode PMCs */ 3240145774Sjkoshy cpu = PMC_TO_CPU(pm); 3241145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3242145256Sjkoshy 3243145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 3244145256Sjkoshy error = ENXIO; 3245145256Sjkoshy break; 3246145256Sjkoshy } 3247145256Sjkoshy 3248145256Sjkoshy /* move this thread to CPU 'cpu' */ 3249145256Sjkoshy pmc_save_cpu_binding(&pb); 3250145256Sjkoshy pmc_select_cpu(cpu); 3251145256Sjkoshy 3252145774Sjkoshy critical_enter(); 3253145256Sjkoshy /* save old value */ 3254145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3255145256Sjkoshy if ((error = (*md->pmd_read_pmc)(cpu, ri, 3256145256Sjkoshy &oldvalue))) 3257145256Sjkoshy goto error; 3258145256Sjkoshy /* write out new value */ 3259145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3260145256Sjkoshy error = (*md->pmd_write_pmc)(cpu, ri, 3261145256Sjkoshy prw.pm_value); 3262145256Sjkoshy error: 3263145774Sjkoshy critical_exit(); 3264145256Sjkoshy pmc_restore_cpu_binding(&pb); 3265145256Sjkoshy if (error) 3266145256Sjkoshy break; 3267145256Sjkoshy } 3268145256Sjkoshy 3269145256Sjkoshy pprw = (struct pmc_op_pmcrw *) arg; 3270145256Sjkoshy 3271145256Sjkoshy#if DEBUG 3272145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3273145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3274145256Sjkoshy ri, prw.pm_value, oldvalue); 3275145256Sjkoshy else 3276145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3277145256Sjkoshy#endif 3278145256Sjkoshy 3279145256Sjkoshy /* return old value if requested */ 3280145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3281145256Sjkoshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3282145256Sjkoshy sizeof(prw.pm_value)))) 3283145256Sjkoshy break; 3284145256Sjkoshy 3285145256Sjkoshy } 3286145256Sjkoshy break; 3287145256Sjkoshy 3288145256Sjkoshy 3289145256Sjkoshy /* 3290145256Sjkoshy * Set the sampling rate for a sampling mode PMC and the 3291145256Sjkoshy * initial count for a counting mode PMC. 3292145256Sjkoshy */ 3293145256Sjkoshy 3294145256Sjkoshy case PMC_OP_PMCSETCOUNT: 3295145256Sjkoshy { 3296145256Sjkoshy struct pmc *pm; 3297145256Sjkoshy struct pmc_op_pmcsetcount sc; 3298145256Sjkoshy 3299145256Sjkoshy PMC_DOWNGRADE_SX(); 3300145256Sjkoshy 3301145256Sjkoshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3302145256Sjkoshy break; 3303145256Sjkoshy 3304145256Sjkoshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3305145256Sjkoshy break; 3306145256Sjkoshy 3307145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3308145256Sjkoshy error = EBUSY; 3309145256Sjkoshy break; 3310145256Sjkoshy } 3311145256Sjkoshy 3312145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3313145256Sjkoshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3314145256Sjkoshy else 3315145256Sjkoshy pm->pm_sc.pm_initial = sc.pm_count; 3316145256Sjkoshy } 3317145256Sjkoshy break; 3318145256Sjkoshy 3319145256Sjkoshy 3320145256Sjkoshy /* 3321145256Sjkoshy * Start a PMC. 3322145256Sjkoshy */ 3323145256Sjkoshy 3324145256Sjkoshy case PMC_OP_PMCSTART: 3325145256Sjkoshy { 3326145256Sjkoshy pmc_id_t pmcid; 3327145256Sjkoshy struct pmc *pm; 3328145256Sjkoshy struct pmc_op_simple sp; 3329145256Sjkoshy 3330145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3331145256Sjkoshy 3332145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3333145256Sjkoshy break; 3334145256Sjkoshy 3335145256Sjkoshy pmcid = sp.pm_pmcid; 3336145256Sjkoshy 3337145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3338145256Sjkoshy break; 3339145256Sjkoshy 3340145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3341145774Sjkoshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3342145774Sjkoshy pm->pm_id, pmcid)); 3343145256Sjkoshy 3344145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3345145256Sjkoshy break; 3346145256Sjkoshy else if (pm->pm_state != PMC_STATE_STOPPED && 3347145256Sjkoshy pm->pm_state != PMC_STATE_ALLOCATED) { 3348145256Sjkoshy error = EINVAL; 3349145256Sjkoshy break; 3350145256Sjkoshy } 3351145256Sjkoshy 3352145256Sjkoshy error = pmc_start(pm); 3353145256Sjkoshy } 3354145256Sjkoshy break; 3355145256Sjkoshy 3356145256Sjkoshy 3357145256Sjkoshy /* 3358145256Sjkoshy * Stop a PMC. 3359145256Sjkoshy */ 3360145256Sjkoshy 3361145256Sjkoshy case PMC_OP_PMCSTOP: 3362145256Sjkoshy { 3363145256Sjkoshy pmc_id_t pmcid; 3364145256Sjkoshy struct pmc *pm; 3365145256Sjkoshy struct pmc_op_simple sp; 3366145256Sjkoshy 3367145256Sjkoshy PMC_DOWNGRADE_SX(); 3368145256Sjkoshy 3369145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3370145256Sjkoshy break; 3371145256Sjkoshy 3372145256Sjkoshy pmcid = sp.pm_pmcid; 3373145256Sjkoshy 3374145256Sjkoshy /* 3375145256Sjkoshy * Mark the PMC as inactive and invoke the MD stop 3376145256Sjkoshy * routines if needed. 3377145256Sjkoshy */ 3378145256Sjkoshy 3379145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3380145256Sjkoshy break; 3381145256Sjkoshy 3382145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3383145774Sjkoshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3384145774Sjkoshy pm->pm_id, pmcid)); 3385145256Sjkoshy 3386145256Sjkoshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3387145256Sjkoshy break; 3388145256Sjkoshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3389145256Sjkoshy error = EINVAL; 3390145256Sjkoshy break; 3391145256Sjkoshy } 3392145256Sjkoshy 3393145256Sjkoshy error = pmc_stop(pm); 3394145256Sjkoshy } 3395145256Sjkoshy break; 3396145256Sjkoshy 3397145256Sjkoshy 3398145256Sjkoshy /* 3399147867Sjkoshy * Write a user supplied value to the log file. 3400145256Sjkoshy */ 3401145256Sjkoshy 3402145256Sjkoshy case PMC_OP_WRITELOG: 3403145256Sjkoshy { 3404147191Sjkoshy struct pmc_op_writelog wl; 3405147191Sjkoshy struct pmc_owner *po; 3406145256Sjkoshy 3407145256Sjkoshy PMC_DOWNGRADE_SX(); 3408145256Sjkoshy 3409147191Sjkoshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 3410145256Sjkoshy break; 3411145256Sjkoshy 3412147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3413145256Sjkoshy error = EINVAL; 3414145256Sjkoshy break; 3415145256Sjkoshy } 3416145256Sjkoshy 3417147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 3418145774Sjkoshy error = EINVAL; 3419145774Sjkoshy break; 3420145774Sjkoshy } 3421145774Sjkoshy 3422147191Sjkoshy error = pmclog_process_userlog(po, &wl); 3423145256Sjkoshy } 3424145256Sjkoshy break; 3425145256Sjkoshy 3426147191Sjkoshy 3427145256Sjkoshy default: 3428145256Sjkoshy error = EINVAL; 3429145256Sjkoshy break; 3430145256Sjkoshy } 3431145256Sjkoshy 3432145256Sjkoshy if (is_sx_downgraded) 3433145256Sjkoshy sx_sunlock(&pmc_sx); 3434145256Sjkoshy else 3435145256Sjkoshy sx_xunlock(&pmc_sx); 3436145256Sjkoshy 3437145256Sjkoshy if (error) 3438145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 3439145256Sjkoshy 3440147191Sjkoshy PICKUP_GIANT(); 3441147191Sjkoshy 3442145256Sjkoshy return error; 3443145256Sjkoshy} 3444145256Sjkoshy 3445145256Sjkoshy/* 3446145256Sjkoshy * Helper functions 3447145256Sjkoshy */ 3448145256Sjkoshy 3449147191Sjkoshy 3450145256Sjkoshy/* 3451147191Sjkoshy * Interrupt processing. 3452147191Sjkoshy * 3453147191Sjkoshy * Find a free slot in the per-cpu array of PC samples and write the 3454147191Sjkoshy * current (PMC,PID,PC) triple to it. If an event was successfully 3455147191Sjkoshy * added, a bit is set in mask 'pmc_cpumask' denoting that the 3456147191Sjkoshy * DO_SAMPLES hook needs to be invoked from the clock handler. 3457147191Sjkoshy * 3458147191Sjkoshy * This function is meant to be called from an NMI handler. It cannot 3459147191Sjkoshy * use any of the locking primitives supplied by the OS. 3460145256Sjkoshy */ 3461145256Sjkoshy 3462147191Sjkoshyint 3463147708Sjkoshypmc_process_interrupt(int cpu, struct pmc *pm, uintfptr_t pc, int usermode) 3464145256Sjkoshy{ 3465147191Sjkoshy int error, ri; 3466147191Sjkoshy struct thread *td; 3467147191Sjkoshy struct pmc_sample *ps; 3468147191Sjkoshy struct pmc_samplebuffer *psb; 3469145256Sjkoshy 3470147191Sjkoshy error = 0; 3471147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3472145256Sjkoshy 3473147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3474145256Sjkoshy 3475147191Sjkoshy ps = psb->ps_write; 3476147191Sjkoshy if (ps->ps_pc) { /* in use, reader hasn't caught up */ 3477147867Sjkoshy pm->pm_stalled = 1; 3478147191Sjkoshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 3479147191Sjkoshy PMCDBG(SAM,INT,1,"(spc) cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", 3480147708Sjkoshy cpu, pm, (uint64_t) pc, usermode, 3481147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3482147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3483147191Sjkoshy error = ENOMEM; 3484147191Sjkoshy goto done; 3485147191Sjkoshy } 3486145256Sjkoshy 3487147191Sjkoshy /* fill in entry */ 3488147191Sjkoshy PMCDBG(SAM,INT,1,"cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", cpu, pm, 3489147708Sjkoshy (uint64_t) pc, usermode, 3490147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3491147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3492145256Sjkoshy 3493147191Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); /* hold onto PMC */ 3494147191Sjkoshy ps->ps_pmc = pm; 3495147191Sjkoshy if ((td = curthread) && td->td_proc) 3496147191Sjkoshy ps->ps_pid = td->td_proc->p_pid; 3497147191Sjkoshy else 3498147191Sjkoshy ps->ps_pid = -1; 3499147191Sjkoshy ps->ps_usermode = usermode; 3500147191Sjkoshy ps->ps_pc = pc; /* mark entry as in use */ 3501145256Sjkoshy 3502147191Sjkoshy /* increment write pointer, modulo ring buffer size */ 3503147191Sjkoshy ps++; 3504147191Sjkoshy if (ps == psb->ps_fence) 3505147191Sjkoshy psb->ps_write = psb->ps_samples; 3506147191Sjkoshy else 3507147191Sjkoshy psb->ps_write = ps; 3508145256Sjkoshy 3509147191Sjkoshy done: 3510147191Sjkoshy /* mark CPU as needing processing */ 3511147191Sjkoshy atomic_set_rel_int(&pmc_cpumask, (1 << cpu)); 3512147191Sjkoshy 3513147191Sjkoshy return error; 3514145256Sjkoshy} 3515145256Sjkoshy 3516147191Sjkoshy 3517145256Sjkoshy/* 3518147191Sjkoshy * Process saved PC samples. 3519145256Sjkoshy */ 3520145256Sjkoshy 3521145256Sjkoshystatic void 3522147191Sjkoshypmc_process_samples(int cpu) 3523145256Sjkoshy{ 3524147191Sjkoshy int n, ri; 3525147191Sjkoshy struct pmc *pm; 3526147191Sjkoshy struct thread *td; 3527147191Sjkoshy struct pmc_owner *po; 3528147191Sjkoshy struct pmc_sample *ps; 3529147191Sjkoshy struct pmc_samplebuffer *psb; 3530145256Sjkoshy 3531147191Sjkoshy KASSERT(PCPU_GET(cpuid) == cpu, 3532147191Sjkoshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 3533147191Sjkoshy PCPU_GET(cpuid), cpu)); 3534145256Sjkoshy 3535147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3536147191Sjkoshy 3537147191Sjkoshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 3538147191Sjkoshy 3539147191Sjkoshy ps = psb->ps_read; 3540147191Sjkoshy if (ps->ps_pc == (uintfptr_t) 0) /* no data */ 3541147191Sjkoshy break; 3542147191Sjkoshy 3543147191Sjkoshy pm = ps->ps_pmc; 3544147191Sjkoshy po = pm->pm_owner; 3545147191Sjkoshy 3546147191Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 3547147191Sjkoshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 3548147191Sjkoshy pm, PMC_TO_MODE(pm))); 3549147191Sjkoshy 3550147191Sjkoshy /* Ignore PMCs that have been switched off */ 3551147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 3552147191Sjkoshy goto entrydone; 3553147191Sjkoshy 3554147191Sjkoshy PMCDBG(SAM,OPS,1,"cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", cpu, 3555147708Sjkoshy pm, (uint64_t) ps->ps_pc, ps->ps_usermode, 3556147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3557147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3558147191Sjkoshy 3559147191Sjkoshy /* 3560147191Sjkoshy * If this is a process-mode PMC that is attached to 3561147191Sjkoshy * its owner, and if the PC is in user mode, update 3562147191Sjkoshy * profiling statistics like timer-based profiling 3563147191Sjkoshy * would have done. 3564147191Sjkoshy */ 3565147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 3566147191Sjkoshy if (ps->ps_usermode) { 3567147191Sjkoshy td = FIRST_THREAD_IN_PROC(po->po_owner); 3568147191Sjkoshy addupc_intr(td, ps->ps_pc, 1); 3569147191Sjkoshy } 3570147191Sjkoshy goto entrydone; 3571147191Sjkoshy } 3572147191Sjkoshy 3573147191Sjkoshy /* 3574147191Sjkoshy * Otherwise, this is either a sampling mode PMC that 3575147191Sjkoshy * is attached to a different process than its owner, 3576147191Sjkoshy * or a system-wide sampling PMC. Dispatch a log 3577147191Sjkoshy * entry to the PMC's owner process. 3578147191Sjkoshy */ 3579147191Sjkoshy 3580147191Sjkoshy pmclog_process_pcsample(pm, ps); 3581147191Sjkoshy 3582147191Sjkoshy entrydone: 3583147191Sjkoshy ps->ps_pc = (uintfptr_t) 0; /* mark entry as free */ 3584147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 3585147191Sjkoshy 3586147191Sjkoshy /* increment read pointer, modulo sample size */ 3587147191Sjkoshy if (++ps == psb->ps_fence) 3588147191Sjkoshy psb->ps_read = psb->ps_samples; 3589147191Sjkoshy else 3590147191Sjkoshy psb->ps_read = ps; 3591147191Sjkoshy } 3592147191Sjkoshy 3593147191Sjkoshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 3594147191Sjkoshy 3595147191Sjkoshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 3596147191Sjkoshy if (n == 0) 3597147191Sjkoshy return; 3598147191Sjkoshy 3599147191Sjkoshy /* 3600147191Sjkoshy * Restart any stalled sampling PMCs on this CPU. 3601147191Sjkoshy * 3602147867Sjkoshy * If the NMI handler sets the pm_stalled field of a PMC after 3603147867Sjkoshy * the check below, we'll end up processing the stalled PMC at 3604147867Sjkoshy * the next hardclock tick. 3605147191Sjkoshy */ 3606147191Sjkoshy for (n = 0; n < md->pmd_npmc; n++) { 3607147191Sjkoshy (void) (*md->pmd_get_config)(cpu,n,&pm); 3608147191Sjkoshy if (pm == NULL || /* !cfg'ed */ 3609147191Sjkoshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 3610147191Sjkoshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 3611147867Sjkoshy pm->pm_stalled == 0) /* !stalled */ 3612147191Sjkoshy continue; 3613147191Sjkoshy 3614147867Sjkoshy pm->pm_stalled = 0; 3615147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3616147191Sjkoshy (*md->pmd_start_pmc)(cpu, ri); 3617147191Sjkoshy } 3618145256Sjkoshy} 3619145256Sjkoshy 3620145256Sjkoshy/* 3621145256Sjkoshy * Event handlers. 3622145256Sjkoshy */ 3623145256Sjkoshy 3624145256Sjkoshy/* 3625145256Sjkoshy * Handle a process exit. 3626145256Sjkoshy * 3627147191Sjkoshy * Remove this process from all hash tables. If this process 3628147191Sjkoshy * owned any PMCs, turn off those PMCs and deallocate them, 3629147191Sjkoshy * removing any associations with target processes. 3630147191Sjkoshy * 3631147191Sjkoshy * This function will be called by the last 'thread' of a 3632147191Sjkoshy * process. 3633147191Sjkoshy * 3634145256Sjkoshy * XXX This eventhandler gets called early in the exit process. 3635145256Sjkoshy * Consider using a 'hook' invocation from thread_exit() or equivalent 3636145256Sjkoshy * spot. Another negative is that kse_exit doesn't seem to call 3637145256Sjkoshy * exit1() [??]. 3638147191Sjkoshy * 3639145256Sjkoshy */ 3640145256Sjkoshy 3641145256Sjkoshystatic void 3642145256Sjkoshypmc_process_exit(void *arg __unused, struct proc *p) 3643145256Sjkoshy{ 3644145256Sjkoshy int is_using_hwpmcs; 3645147191Sjkoshy int cpu; 3646147191Sjkoshy unsigned int ri; 3647147191Sjkoshy struct pmc *pm; 3648147191Sjkoshy struct pmc_process *pp; 3649147191Sjkoshy struct pmc_owner *po; 3650147191Sjkoshy pmc_value_t newvalue, tmp; 3651145256Sjkoshy 3652145256Sjkoshy PROC_LOCK(p); 3653145256Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 3654145256Sjkoshy PROC_UNLOCK(p); 3655145256Sjkoshy 3656147191Sjkoshy /* 3657147191Sjkoshy * Log a sysexit event to all SS PMC owners. 3658147191Sjkoshy */ 3659147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 3660147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 3661147191Sjkoshy pmclog_process_sysexit(po, p->p_pid); 3662145256Sjkoshy 3663147191Sjkoshy if (!is_using_hwpmcs) 3664147191Sjkoshy return; 3665147191Sjkoshy 3666147191Sjkoshy PMC_GET_SX_XLOCK(); 3667147191Sjkoshy PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 3668147191Sjkoshy p->p_comm); 3669147191Sjkoshy 3670147191Sjkoshy /* 3671147191Sjkoshy * Since this code is invoked by the last thread in an exiting 3672147191Sjkoshy * process, we would have context switched IN at some prior 3673147191Sjkoshy * point. However, with PREEMPTION, kernel mode context 3674147191Sjkoshy * switches may happen any time, so we want to disable a 3675147191Sjkoshy * context switch OUT till we get any PMCs targetting this 3676147191Sjkoshy * process off the hardware. 3677147191Sjkoshy * 3678147191Sjkoshy * We also need to atomically remove this process' 3679147191Sjkoshy * entry from our target process hash table, using 3680147191Sjkoshy * PMC_FLAG_REMOVE. 3681147191Sjkoshy */ 3682147191Sjkoshy PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 3683147191Sjkoshy p->p_comm); 3684147191Sjkoshy 3685147191Sjkoshy critical_enter(); /* no preemption */ 3686147191Sjkoshy 3687147191Sjkoshy cpu = curthread->td_oncpu; 3688147191Sjkoshy 3689147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, 3690147191Sjkoshy PMC_FLAG_REMOVE)) != NULL) { 3691147191Sjkoshy 3692147191Sjkoshy PMCDBG(PRC,EXT,2, 3693147191Sjkoshy "process-exit proc=%p pmc-process=%p", p, pp); 3694147191Sjkoshy 3695147191Sjkoshy /* 3696147191Sjkoshy * The exiting process could the target of 3697147191Sjkoshy * some PMCs which will be running on 3698147191Sjkoshy * currently executing CPU. 3699147191Sjkoshy * 3700147191Sjkoshy * We need to turn these PMCs off like we 3701147191Sjkoshy * would do at context switch OUT time. 3702147191Sjkoshy */ 3703147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 3704147191Sjkoshy 3705147191Sjkoshy /* 3706147191Sjkoshy * Pick up the pmc pointer from hardware 3707147191Sjkoshy * state similar to the CSW_OUT code. 3708147191Sjkoshy */ 3709147191Sjkoshy pm = NULL; 3710147191Sjkoshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 3711147191Sjkoshy 3712147191Sjkoshy PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 3713147191Sjkoshy 3714147191Sjkoshy if (pm == NULL || 3715147191Sjkoshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 3716147191Sjkoshy continue; 3717147191Sjkoshy 3718147191Sjkoshy PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 3719147191Sjkoshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 3720147191Sjkoshy pm, pm->pm_state); 3721147191Sjkoshy 3722147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 3723147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 3724147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 3725147191Sjkoshy 3726147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 3727147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 3728147191Sjkoshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 3729147191Sjkoshy 3730147191Sjkoshy (void) md->pmd_stop_pmc(cpu, ri); 3731147191Sjkoshy 3732147191Sjkoshy KASSERT(pm->pm_runcount > 0, 3733147191Sjkoshy ("[pmc,%d] bad runcount ri %d rc %d", 3734147191Sjkoshy __LINE__, ri, pm->pm_runcount)); 3735147191Sjkoshy 3736147867Sjkoshy /* Stop hardware only if it is actually running */ 3737147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3738147867Sjkoshy pm->pm_stalled == 0) { 3739147191Sjkoshy md->pmd_read_pmc(cpu, ri, &newvalue); 3740147191Sjkoshy tmp = newvalue - 3741147191Sjkoshy PMC_PCPU_SAVED(cpu,ri); 3742147191Sjkoshy 3743147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3744147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 3745147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 3746147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3747147191Sjkoshy } 3748147191Sjkoshy 3749147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount,1); 3750147191Sjkoshy 3751147191Sjkoshy KASSERT((int) pm->pm_runcount >= 0, 3752147191Sjkoshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 3753147191Sjkoshy 3754147191Sjkoshy (void) md->pmd_config_pmc(cpu, ri, NULL); 3755147191Sjkoshy } 3756147191Sjkoshy 3757147191Sjkoshy /* 3758147191Sjkoshy * Inform the MD layer of this pseudo "context switch 3759147191Sjkoshy * out" 3760147191Sjkoshy */ 3761147191Sjkoshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 3762147191Sjkoshy 3763147191Sjkoshy critical_exit(); /* ok to be pre-empted now */ 3764147191Sjkoshy 3765147191Sjkoshy /* 3766147191Sjkoshy * Unlink this process from the PMCs that are 3767147191Sjkoshy * targetting it. This will send a signal to 3768147191Sjkoshy * all PMC owner's whose PMCs are orphaned. 3769147191Sjkoshy * 3770147191Sjkoshy * Log PMC value at exit time if requested. 3771147191Sjkoshy */ 3772147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 3773147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 3774147867Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 3775147867Sjkoshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 3776147191Sjkoshy pmclog_process_procexit(pm, pp); 3777147191Sjkoshy pmc_unlink_target_process(pm, pp); 3778147191Sjkoshy } 3779147191Sjkoshy FREE(pp, M_PMC); 3780147191Sjkoshy 3781147191Sjkoshy } else 3782147191Sjkoshy critical_exit(); /* pp == NULL */ 3783147191Sjkoshy 3784147191Sjkoshy 3785147191Sjkoshy /* 3786147191Sjkoshy * If the process owned PMCs, free them up and free up 3787147191Sjkoshy * memory. 3788147191Sjkoshy */ 3789147191Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 3790147191Sjkoshy pmc_remove_owner(po); 3791147191Sjkoshy pmc_destroy_owner_descriptor(po); 3792145256Sjkoshy } 3793147191Sjkoshy 3794147191Sjkoshy sx_xunlock(&pmc_sx); 3795145256Sjkoshy} 3796145256Sjkoshy 3797145256Sjkoshy/* 3798145256Sjkoshy * Handle a process fork. 3799145256Sjkoshy * 3800145256Sjkoshy * If the parent process 'p1' is under HWPMC monitoring, then copy 3801145256Sjkoshy * over any attached PMCs that have 'do_descendants' semantics. 3802145256Sjkoshy */ 3803145256Sjkoshy 3804145256Sjkoshystatic void 3805147191Sjkoshypmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 3806145256Sjkoshy int flags) 3807145256Sjkoshy{ 3808145256Sjkoshy int is_using_hwpmcs; 3809147191Sjkoshy unsigned int ri; 3810147191Sjkoshy uint32_t do_descendants; 3811147191Sjkoshy struct pmc *pm; 3812147191Sjkoshy struct pmc_owner *po; 3813147191Sjkoshy struct pmc_process *ppnew, *ppold; 3814145256Sjkoshy 3815145256Sjkoshy (void) flags; /* unused parameter */ 3816145256Sjkoshy 3817145256Sjkoshy PROC_LOCK(p1); 3818145256Sjkoshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 3819145256Sjkoshy PROC_UNLOCK(p1); 3820145256Sjkoshy 3821147191Sjkoshy /* 3822147191Sjkoshy * If there are system-wide sampling PMCs active, we need to 3823147191Sjkoshy * log all fork events to their owner's logs. 3824147191Sjkoshy */ 3825147191Sjkoshy 3826147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 3827147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 3828147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 3829147191Sjkoshy 3830147191Sjkoshy if (!is_using_hwpmcs) 3831147191Sjkoshy return; 3832147191Sjkoshy 3833147191Sjkoshy PMC_GET_SX_XLOCK(); 3834147191Sjkoshy PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 3835147191Sjkoshy p1->p_pid, p1->p_comm, newproc); 3836147191Sjkoshy 3837147191Sjkoshy /* 3838147191Sjkoshy * If the parent process (curthread->td_proc) is a 3839147191Sjkoshy * target of any PMCs, look for PMCs that are to be 3840147191Sjkoshy * inherited, and link these into the new process 3841147191Sjkoshy * descriptor. 3842147191Sjkoshy */ 3843147191Sjkoshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 3844147191Sjkoshy PMC_FLAG_NONE)) == NULL) 3845147191Sjkoshy goto done; /* nothing to do */ 3846147191Sjkoshy 3847147191Sjkoshy do_descendants = 0; 3848147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 3849147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 3850147191Sjkoshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 3851147191Sjkoshy if (do_descendants == 0) /* nothing to do */ 3852147191Sjkoshy goto done; 3853147191Sjkoshy 3854147191Sjkoshy /* allocate a descriptor for the new process */ 3855147191Sjkoshy if ((ppnew = pmc_find_process_descriptor(newproc, 3856147191Sjkoshy PMC_FLAG_ALLOCATE)) == NULL) 3857147191Sjkoshy goto done; 3858147191Sjkoshy 3859147191Sjkoshy /* 3860147191Sjkoshy * Run through all PMCs that were targeting the old process 3861147191Sjkoshy * and which specified F_DESCENDANTS and attach them to the 3862147191Sjkoshy * new process. 3863147191Sjkoshy * 3864147191Sjkoshy * Log the fork event to all owners of PMCs attached to this 3865147191Sjkoshy * process, if not already logged. 3866147191Sjkoshy */ 3867147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 3868147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 3869147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3870147191Sjkoshy pmc_link_target_process(pm, ppnew); 3871147191Sjkoshy po = pm->pm_owner; 3872147191Sjkoshy if (po->po_sscount == 0 && 3873147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 3874147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, 3875147191Sjkoshy newproc->p_pid); 3876147191Sjkoshy } 3877147191Sjkoshy 3878147191Sjkoshy /* 3879147191Sjkoshy * Now mark the new process as being tracked by this driver. 3880147191Sjkoshy */ 3881147191Sjkoshy PROC_LOCK(newproc); 3882147191Sjkoshy newproc->p_flag |= P_HWPMC; 3883147191Sjkoshy PROC_UNLOCK(newproc); 3884147191Sjkoshy 3885147191Sjkoshy done: 3886147191Sjkoshy sx_xunlock(&pmc_sx); 3887145256Sjkoshy} 3888145256Sjkoshy 3889145256Sjkoshy 3890145256Sjkoshy/* 3891145256Sjkoshy * initialization 3892145256Sjkoshy */ 3893145256Sjkoshy 3894145256Sjkoshystatic const char *pmc_name_of_pmcclass[] = { 3895145256Sjkoshy#undef __PMC_CLASS 3896145256Sjkoshy#define __PMC_CLASS(N) #N , 3897145256Sjkoshy __PMC_CLASSES() 3898145256Sjkoshy}; 3899145256Sjkoshy 3900145256Sjkoshystatic int 3901145256Sjkoshypmc_initialize(void) 3902145256Sjkoshy{ 3903147191Sjkoshy int cpu, error, n; 3904145256Sjkoshy struct pmc_binding pb; 3905147191Sjkoshy struct pmc_samplebuffer *sb; 3906145256Sjkoshy 3907145256Sjkoshy md = NULL; 3908145256Sjkoshy error = 0; 3909145256Sjkoshy 3910145256Sjkoshy#if DEBUG 3911145256Sjkoshy /* parse debug flags first */ 3912145256Sjkoshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 3913145256Sjkoshy pmc_debugstr, sizeof(pmc_debugstr))) 3914145256Sjkoshy pmc_debugflags_parse(pmc_debugstr, 3915145256Sjkoshy pmc_debugstr+strlen(pmc_debugstr)); 3916145256Sjkoshy#endif 3917145256Sjkoshy 3918145256Sjkoshy PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 3919145256Sjkoshy 3920145256Sjkoshy /* 3921145256Sjkoshy * check sysctl parameters 3922145256Sjkoshy */ 3923145256Sjkoshy 3924145256Sjkoshy if (pmc_hashsize <= 0) { 3925147191Sjkoshy (void) printf("hwpmc: tunable hashsize=%d must be greater " 3926147191Sjkoshy "than zero.\n", pmc_hashsize); 3927145256Sjkoshy pmc_hashsize = PMC_HASH_SIZE; 3928145256Sjkoshy } 3929145256Sjkoshy 3930147191Sjkoshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 3931147191Sjkoshy (void) printf("hwpmc: tunable nsamples=%d out of range.\n", pmc_nsamples); 3932147191Sjkoshy pmc_nsamples = PMC_NSAMPLES; 3933147191Sjkoshy } 3934145256Sjkoshy 3935147191Sjkoshy md = pmc_md_initialize(); 3936147191Sjkoshy 3937145256Sjkoshy if (md == NULL || md->pmd_init == NULL) 3938145256Sjkoshy return ENOSYS; 3939145256Sjkoshy 3940145256Sjkoshy /* allocate space for the per-cpu array */ 3941145256Sjkoshy MALLOC(pmc_pcpu, struct pmc_cpu **, mp_ncpus * sizeof(struct pmc_cpu *), 3942145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 3943145256Sjkoshy 3944145256Sjkoshy /* per-cpu 'saved values' for managing process-mode PMCs */ 3945145256Sjkoshy MALLOC(pmc_pcpu_saved, pmc_value_t *, 3946145256Sjkoshy sizeof(pmc_value_t) * mp_ncpus * md->pmd_npmc, M_PMC, M_WAITOK); 3947145256Sjkoshy 3948145256Sjkoshy /* perform cpu dependent initialization */ 3949145256Sjkoshy pmc_save_cpu_binding(&pb); 3950145256Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 3951145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 3952145256Sjkoshy continue; 3953145256Sjkoshy pmc_select_cpu(cpu); 3954145256Sjkoshy if ((error = md->pmd_init(cpu)) != 0) 3955145256Sjkoshy break; 3956145256Sjkoshy } 3957145256Sjkoshy pmc_restore_cpu_binding(&pb); 3958145256Sjkoshy 3959145256Sjkoshy if (error != 0) 3960145256Sjkoshy return error; 3961145256Sjkoshy 3962147191Sjkoshy /* allocate space for the sample array */ 3963147191Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 3964147191Sjkoshy if (pmc_cpu_is_disabled(cpu)) 3965147191Sjkoshy continue; 3966147191Sjkoshy MALLOC(sb, struct pmc_samplebuffer *, 3967147191Sjkoshy sizeof(struct pmc_samplebuffer) + 3968147191Sjkoshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 3969147191Sjkoshy M_WAITOK|M_ZERO); 3970147191Sjkoshy 3971147191Sjkoshy sb->ps_read = sb->ps_write = sb->ps_samples; 3972147191Sjkoshy sb->ps_fence = sb->ps_samples + pmc_nsamples 3973147191Sjkoshy; 3974147191Sjkoshy KASSERT(pmc_pcpu[cpu] != NULL, 3975147191Sjkoshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 3976147191Sjkoshy 3977147191Sjkoshy pmc_pcpu[cpu]->pc_sb = sb; 3978147191Sjkoshy } 3979147191Sjkoshy 3980145256Sjkoshy /* allocate space for the row disposition array */ 3981145256Sjkoshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 3982145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 3983145256Sjkoshy 3984145256Sjkoshy KASSERT(pmc_pmcdisp != NULL, 3985145256Sjkoshy ("[pmc,%d] pmcdisp allocation returned NULL", __LINE__)); 3986145256Sjkoshy 3987145256Sjkoshy /* mark all PMCs as available */ 3988145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 3989145256Sjkoshy PMC_MARK_ROW_FREE(n); 3990145256Sjkoshy 3991145256Sjkoshy /* allocate thread hash tables */ 3992145256Sjkoshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 3993145256Sjkoshy &pmc_ownerhashmask); 3994145256Sjkoshy 3995145256Sjkoshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 3996145256Sjkoshy &pmc_processhashmask); 3997145256Sjkoshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc", MTX_SPIN); 3998145256Sjkoshy 3999147191Sjkoshy LIST_INIT(&pmc_ss_owners); 4000147191Sjkoshy pmc_ss_count = 0; 4001147191Sjkoshy 4002145256Sjkoshy /* allocate a pool of spin mutexes */ 4003145256Sjkoshy pmc_mtxpool = mtx_pool_create("pmc", pmc_mtxpool_size, MTX_SPIN); 4004145256Sjkoshy 4005145256Sjkoshy PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4006145256Sjkoshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4007145256Sjkoshy pmc_processhash, pmc_processhashmask); 4008145256Sjkoshy 4009145256Sjkoshy /* register process {exit,fork,exec} handlers */ 4010145256Sjkoshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4011145256Sjkoshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4012145256Sjkoshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4013145256Sjkoshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4014145256Sjkoshy 4015147191Sjkoshy /* initialize logging */ 4016147191Sjkoshy pmclog_initialize(); 4017147191Sjkoshy 4018145256Sjkoshy /* set hook functions */ 4019145256Sjkoshy pmc_intr = md->pmd_intr; 4020145256Sjkoshy pmc_hook = pmc_hook_handler; 4021145256Sjkoshy 4022145256Sjkoshy if (error == 0) { 4023145256Sjkoshy printf(PMC_MODULE_NAME ":"); 4024145256Sjkoshy for (n = 0; n < (int) md->pmd_nclass; n++) 4025145256Sjkoshy printf(" %s(%d)", 4026145774Sjkoshy pmc_name_of_pmcclass[md->pmd_classes[n].pm_class], 4027145256Sjkoshy md->pmd_nclasspmcs[n]); 4028145256Sjkoshy printf("\n"); 4029145256Sjkoshy } 4030145256Sjkoshy 4031145256Sjkoshy return error; 4032145256Sjkoshy} 4033145256Sjkoshy 4034145256Sjkoshy/* prepare to be unloaded */ 4035145256Sjkoshystatic void 4036145256Sjkoshypmc_cleanup(void) 4037145256Sjkoshy{ 4038145256Sjkoshy int cpu; 4039145256Sjkoshy struct pmc_ownerhash *ph; 4040145256Sjkoshy struct pmc_owner *po, *tmp; 4041145256Sjkoshy struct pmc_binding pb; 4042145256Sjkoshy#if DEBUG 4043145256Sjkoshy struct pmc_processhash *prh; 4044145256Sjkoshy#endif 4045145256Sjkoshy 4046145256Sjkoshy PMCDBG(MOD,INI,0, "%s", "cleanup"); 4047145256Sjkoshy 4048147191Sjkoshy /* switch off sampling */ 4049147191Sjkoshy atomic_store_rel_int(&pmc_cpumask, 0); 4050147191Sjkoshy pmc_intr = NULL; 4051145256Sjkoshy 4052145256Sjkoshy sx_xlock(&pmc_sx); 4053145256Sjkoshy if (pmc_hook == NULL) { /* being unloaded already */ 4054145256Sjkoshy sx_xunlock(&pmc_sx); 4055145256Sjkoshy return; 4056145256Sjkoshy } 4057145256Sjkoshy 4058145256Sjkoshy pmc_hook = NULL; /* prevent new threads from entering module */ 4059145256Sjkoshy 4060145256Sjkoshy /* deregister event handlers */ 4061145256Sjkoshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 4062145256Sjkoshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 4063145256Sjkoshy 4064145256Sjkoshy /* send SIGBUS to all owner threads, free up allocations */ 4065145256Sjkoshy if (pmc_ownerhash) 4066145256Sjkoshy for (ph = pmc_ownerhash; 4067145256Sjkoshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 4068145256Sjkoshy ph++) { 4069145256Sjkoshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 4070145256Sjkoshy pmc_remove_owner(po); 4071145256Sjkoshy 4072145256Sjkoshy /* send SIGBUS to owner processes */ 4073145256Sjkoshy PMCDBG(MOD,INI,2, "cleanup signal proc=%p " 4074145256Sjkoshy "(%d, %s)", po->po_owner, 4075145256Sjkoshy po->po_owner->p_pid, 4076145256Sjkoshy po->po_owner->p_comm); 4077145256Sjkoshy 4078145256Sjkoshy PROC_LOCK(po->po_owner); 4079145256Sjkoshy psignal(po->po_owner, SIGBUS); 4080145256Sjkoshy PROC_UNLOCK(po->po_owner); 4081147191Sjkoshy 4082147191Sjkoshy pmc_destroy_owner_descriptor(po); 4083145256Sjkoshy } 4084145256Sjkoshy } 4085145256Sjkoshy 4086145256Sjkoshy /* reclaim allocated data structures */ 4087145256Sjkoshy if (pmc_mtxpool) 4088145256Sjkoshy mtx_pool_destroy(&pmc_mtxpool); 4089145256Sjkoshy 4090145256Sjkoshy mtx_destroy(&pmc_processhash_mtx); 4091145256Sjkoshy if (pmc_processhash) { 4092145256Sjkoshy#if DEBUG 4093145256Sjkoshy struct pmc_process *pp; 4094145256Sjkoshy 4095145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy process hash"); 4096145256Sjkoshy for (prh = pmc_processhash; 4097145256Sjkoshy prh <= &pmc_processhash[pmc_processhashmask]; 4098145256Sjkoshy prh++) 4099145256Sjkoshy LIST_FOREACH(pp, prh, pp_next) 4100145256Sjkoshy PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 4101145256Sjkoshy#endif 4102145256Sjkoshy 4103145256Sjkoshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 4104145256Sjkoshy pmc_processhash = NULL; 4105145256Sjkoshy } 4106145256Sjkoshy 4107145256Sjkoshy if (pmc_ownerhash) { 4108145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy owner hash"); 4109145256Sjkoshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 4110145256Sjkoshy pmc_ownerhash = NULL; 4111145256Sjkoshy } 4112145256Sjkoshy 4113147191Sjkoshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 4114147191Sjkoshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 4115147191Sjkoshy KASSERT(pmc_ss_count == 0, 4116147191Sjkoshy ("[pmc,%d] Global SS count not empty", __LINE__)); 4117147191Sjkoshy 4118145256Sjkoshy /* do processor dependent cleanup */ 4119145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "md cleanup"); 4120145256Sjkoshy if (md) { 4121145256Sjkoshy pmc_save_cpu_binding(&pb); 4122145256Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4123145256Sjkoshy PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 4124145256Sjkoshy cpu, pmc_pcpu[cpu]); 4125145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4126145256Sjkoshy continue; 4127145256Sjkoshy pmc_select_cpu(cpu); 4128145256Sjkoshy if (pmc_pcpu[cpu]) 4129145256Sjkoshy (void) md->pmd_cleanup(cpu); 4130145256Sjkoshy } 4131145256Sjkoshy FREE(md, M_PMC); 4132145256Sjkoshy md = NULL; 4133145256Sjkoshy pmc_restore_cpu_binding(&pb); 4134145256Sjkoshy } 4135145256Sjkoshy 4136145256Sjkoshy /* deallocate per-cpu structures */ 4137145256Sjkoshy FREE(pmc_pcpu, M_PMC); 4138145256Sjkoshy pmc_pcpu = NULL; 4139145256Sjkoshy 4140145256Sjkoshy FREE(pmc_pcpu_saved, M_PMC); 4141145256Sjkoshy pmc_pcpu_saved = NULL; 4142145256Sjkoshy 4143145256Sjkoshy if (pmc_pmcdisp) { 4144145256Sjkoshy FREE(pmc_pmcdisp, M_PMC); 4145145256Sjkoshy pmc_pmcdisp = NULL; 4146145256Sjkoshy } 4147145256Sjkoshy 4148147191Sjkoshy pmclog_shutdown(); 4149147191Sjkoshy 4150145256Sjkoshy sx_xunlock(&pmc_sx); /* we are done */ 4151145256Sjkoshy} 4152145256Sjkoshy 4153145256Sjkoshy/* 4154145256Sjkoshy * The function called at load/unload. 4155145256Sjkoshy */ 4156145256Sjkoshy 4157145256Sjkoshystatic int 4158145256Sjkoshyload (struct module *module __unused, int cmd, void *arg __unused) 4159145256Sjkoshy{ 4160145256Sjkoshy int error; 4161145256Sjkoshy 4162145256Sjkoshy error = 0; 4163145256Sjkoshy 4164145256Sjkoshy switch (cmd) { 4165145256Sjkoshy case MOD_LOAD : 4166145256Sjkoshy /* initialize the subsystem */ 4167145256Sjkoshy error = pmc_initialize(); 4168145256Sjkoshy if (error != 0) 4169145256Sjkoshy break; 4170145256Sjkoshy PMCDBG(MOD,INI,1, "syscall=%d ncpus=%d", 4171145256Sjkoshy pmc_syscall_num, mp_ncpus); 4172145256Sjkoshy break; 4173145256Sjkoshy 4174145256Sjkoshy 4175145256Sjkoshy case MOD_UNLOAD : 4176145256Sjkoshy case MOD_SHUTDOWN: 4177145256Sjkoshy pmc_cleanup(); 4178145256Sjkoshy PMCDBG(MOD,INI,1, "%s", "unloaded"); 4179145256Sjkoshy break; 4180145256Sjkoshy 4181145256Sjkoshy default : 4182145256Sjkoshy error = EINVAL; /* XXX should panic(9) */ 4183145256Sjkoshy break; 4184145256Sjkoshy } 4185145256Sjkoshy 4186145256Sjkoshy return error; 4187145256Sjkoshy} 4188145256Sjkoshy 4189145256Sjkoshy/* memory pool */ 4190145256SjkoshyMALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 4191