hwpmc_mod.c revision 164033
1145256Sjkoshy/*- 2157144Sjkoshy * Copyright (c) 2003-2006 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 164033 2006-11-06 13:42:10Z rwatson $"); 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> 44164033Srwatson#include <sys/priv.h> 45145256Sjkoshy#include <sys/proc.h> 46145256Sjkoshy#include <sys/queue.h> 47147191Sjkoshy#include <sys/resourcevar.h> 48145256Sjkoshy#include <sys/sched.h> 49145256Sjkoshy#include <sys/signalvar.h> 50145256Sjkoshy#include <sys/smp.h> 51145256Sjkoshy#include <sys/sx.h> 52145256Sjkoshy#include <sys/sysctl.h> 53145256Sjkoshy#include <sys/sysent.h> 54145256Sjkoshy#include <sys/systm.h> 55147191Sjkoshy#include <sys/vnode.h> 56145256Sjkoshy 57157144Sjkoshy#include <sys/linker.h> /* needs to be after <sys/malloc.h> */ 58157144Sjkoshy 59147191Sjkoshy#include <machine/atomic.h> 60145256Sjkoshy#include <machine/md_var.h> 61145256Sjkoshy 62145256Sjkoshy/* 63145256Sjkoshy * Types 64145256Sjkoshy */ 65145256Sjkoshy 66145256Sjkoshyenum pmc_flags { 67145256Sjkoshy PMC_FLAG_NONE = 0x00, /* do nothing */ 68145256Sjkoshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 69145256Sjkoshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 70145256Sjkoshy}; 71145256Sjkoshy 72145256Sjkoshy/* 73145256Sjkoshy * The offset in sysent where the syscall is allocated. 74145256Sjkoshy */ 75145256Sjkoshy 76145256Sjkoshystatic int pmc_syscall_num = NO_SYSCALL; 77145256Sjkoshystruct pmc_cpu **pmc_pcpu; /* per-cpu state */ 78145256Sjkoshypmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 79145256Sjkoshy 80145256Sjkoshy#define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 81145256Sjkoshy 82145256Sjkoshystruct mtx_pool *pmc_mtxpool; 83145256Sjkoshystatic int *pmc_pmcdisp; /* PMC row dispositions */ 84145256Sjkoshy 85145256Sjkoshy#define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 86145256Sjkoshy#define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 87145256Sjkoshy#define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 88145256Sjkoshy 89145256Sjkoshy#define PMC_MARK_ROW_FREE(R) do { \ 90145256Sjkoshy pmc_pmcdisp[(R)] = 0; \ 91145256Sjkoshy} while (0) 92145256Sjkoshy 93145256Sjkoshy#define PMC_MARK_ROW_STANDALONE(R) do { \ 94145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 95145256Sjkoshy __LINE__)); \ 96145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 97145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= (-mp_ncpus), ("[pmc,%d] row " \ 98145256Sjkoshy "disposition error", __LINE__)); \ 99145256Sjkoshy} while (0) 100145256Sjkoshy 101145256Sjkoshy#define PMC_UNMARK_ROW_STANDALONE(R) do { \ 102145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 103145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 104145256Sjkoshy __LINE__)); \ 105145256Sjkoshy} while (0) 106145256Sjkoshy 107145256Sjkoshy#define PMC_MARK_ROW_THREAD(R) do { \ 108145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 109145256Sjkoshy __LINE__)); \ 110145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 111145256Sjkoshy} while (0) 112145256Sjkoshy 113145256Sjkoshy#define PMC_UNMARK_ROW_THREAD(R) do { \ 114145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 115145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 116145256Sjkoshy __LINE__)); \ 117145256Sjkoshy} while (0) 118145256Sjkoshy 119145256Sjkoshy 120145256Sjkoshy/* various event handlers */ 121145256Sjkoshystatic eventhandler_tag pmc_exit_tag, pmc_fork_tag; 122145256Sjkoshy 123145256Sjkoshy/* Module statistics */ 124145256Sjkoshystruct pmc_op_getdriverstats pmc_stats; 125145256Sjkoshy 126145256Sjkoshy/* Machine/processor dependent operations */ 127145256Sjkoshystruct pmc_mdep *md; 128145256Sjkoshy 129145256Sjkoshy/* 130145256Sjkoshy * Hash tables mapping owner processes and target threads to PMCs. 131145256Sjkoshy */ 132145256Sjkoshy 133145256Sjkoshystruct mtx pmc_processhash_mtx; /* spin mutex */ 134145256Sjkoshystatic u_long pmc_processhashmask; 135145256Sjkoshystatic LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 136145256Sjkoshy 137145256Sjkoshy/* 138145256Sjkoshy * Hash table of PMC owner descriptors. This table is protected by 139145256Sjkoshy * the shared PMC "sx" lock. 140145256Sjkoshy */ 141145256Sjkoshy 142145256Sjkoshystatic u_long pmc_ownerhashmask; 143145256Sjkoshystatic LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 144145256Sjkoshy 145145256Sjkoshy/* 146147191Sjkoshy * List of PMC owners with system-wide sampling PMCs. 147147191Sjkoshy */ 148147191Sjkoshy 149147191Sjkoshystatic LIST_HEAD(, pmc_owner) pmc_ss_owners; 150147191Sjkoshy 151147191Sjkoshy 152147191Sjkoshy/* 153145256Sjkoshy * Prototypes 154145256Sjkoshy */ 155145256Sjkoshy 156153110Sru#ifdef DEBUG 157145256Sjkoshystatic int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 158145256Sjkoshystatic int pmc_debugflags_parse(char *newstr, char *fence); 159145256Sjkoshy#endif 160145256Sjkoshy 161145256Sjkoshystatic int load(struct module *module, int cmd, void *arg); 162147191Sjkoshystatic int pmc_attach_process(struct proc *p, struct pmc *pm); 163145256Sjkoshystatic struct pmc *pmc_allocate_pmc_descriptor(void); 164147191Sjkoshystatic struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 165147191Sjkoshystatic int pmc_attach_one_process(struct proc *p, struct pmc *pm); 166147191Sjkoshystatic int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 167147191Sjkoshy int cpu); 168147191Sjkoshystatic int pmc_can_attach(struct pmc *pm, struct proc *p); 169147191Sjkoshystatic void pmc_cleanup(void); 170147191Sjkoshystatic int pmc_detach_process(struct proc *p, struct pmc *pm); 171147191Sjkoshystatic int pmc_detach_one_process(struct proc *p, struct pmc *pm, 172147191Sjkoshy int flags); 173147191Sjkoshystatic void pmc_destroy_owner_descriptor(struct pmc_owner *po); 174147191Sjkoshystatic struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 175147191Sjkoshystatic int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 176145256Sjkoshystatic struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 177145256Sjkoshy pmc_id_t pmc); 178145256Sjkoshystatic struct pmc_process *pmc_find_process_descriptor(struct proc *p, 179145256Sjkoshy uint32_t mode); 180145774Sjkoshystatic void pmc_force_context_switch(void); 181145256Sjkoshystatic void pmc_link_target_process(struct pmc *pm, 182145256Sjkoshy struct pmc_process *pp); 183147191Sjkoshystatic void pmc_maybe_remove_owner(struct pmc_owner *po); 184147191Sjkoshystatic void pmc_process_csw_in(struct thread *td); 185147191Sjkoshystatic void pmc_process_csw_out(struct thread *td); 186145256Sjkoshystatic void pmc_process_exit(void *arg, struct proc *p); 187145256Sjkoshystatic void pmc_process_fork(void *arg, struct proc *p1, 188145256Sjkoshy struct proc *p2, int n); 189147191Sjkoshystatic void pmc_process_samples(int cpu); 190147191Sjkoshystatic void pmc_release_pmc_descriptor(struct pmc *pmc); 191147191Sjkoshystatic void pmc_remove_owner(struct pmc_owner *po); 192147191Sjkoshystatic void pmc_remove_process_descriptor(struct pmc_process *pp); 193147191Sjkoshystatic void pmc_restore_cpu_binding(struct pmc_binding *pb); 194147191Sjkoshystatic void pmc_save_cpu_binding(struct pmc_binding *pb); 195147191Sjkoshystatic void pmc_select_cpu(int cpu); 196145256Sjkoshystatic int pmc_start(struct pmc *pm); 197145256Sjkoshystatic int pmc_stop(struct pmc *pm); 198147191Sjkoshystatic int pmc_syscall_handler(struct thread *td, void *syscall_args); 199147191Sjkoshystatic void pmc_unlink_target_process(struct pmc *pmc, 200147191Sjkoshy struct pmc_process *pp); 201145256Sjkoshy 202145256Sjkoshy/* 203145256Sjkoshy * Kernel tunables and sysctl(8) interface. 204145256Sjkoshy */ 205145256Sjkoshy 206145256SjkoshySYSCTL_NODE(_kern, OID_AUTO, hwpmc, CTLFLAG_RW, 0, "HWPMC parameters"); 207145256Sjkoshy 208153110Sru#ifdef DEBUG 209147191Sjkoshystruct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 210145256Sjkoshychar pmc_debugstr[PMC_DEBUG_STRSIZE]; 211145256SjkoshyTUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 212145256Sjkoshy sizeof(pmc_debugstr)); 213145256SjkoshySYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 214145256Sjkoshy CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN, 215145256Sjkoshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 216145256Sjkoshy#endif 217145256Sjkoshy 218145256Sjkoshy/* 219147191Sjkoshy * kern.hwpmc.hashrows -- determines the number of rows in the 220145256Sjkoshy * of the hash table used to look up threads 221145256Sjkoshy */ 222145256Sjkoshy 223145256Sjkoshystatic int pmc_hashsize = PMC_HASH_SIZE; 224145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize); 225145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD, 226145256Sjkoshy &pmc_hashsize, 0, "rows in hash tables"); 227145256Sjkoshy 228145256Sjkoshy/* 229147191Sjkoshy * kern.hwpmc.nsamples --- number of PC samples per CPU 230145256Sjkoshy */ 231145256Sjkoshy 232147191Sjkoshystatic int pmc_nsamples = PMC_NSAMPLES; 233147191SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nsamples", &pmc_nsamples); 234147191SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_TUN|CTLFLAG_RD, 235147191Sjkoshy &pmc_nsamples, 0, "number of PC samples per CPU"); 236145256Sjkoshy 237145256Sjkoshy/* 238147191Sjkoshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 239145256Sjkoshy */ 240145256Sjkoshy 241145256Sjkoshystatic int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 242145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size); 243145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD, 244145256Sjkoshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 245145256Sjkoshy 246145256Sjkoshy 247145256Sjkoshy/* 248145256Sjkoshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 249145256Sjkoshy * allocate system-wide PMCs. 250145256Sjkoshy * 251145256Sjkoshy * Allowing unprivileged processes to allocate system PMCs is convenient 252145256Sjkoshy * if system-wide measurements need to be taken concurrently with other 253145256Sjkoshy * per-process measurements. This feature is turned off by default. 254145256Sjkoshy */ 255145256Sjkoshy 256145256Sjkoshystatic int pmc_unprivileged_syspmcs = 0; 257145256SjkoshyTUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs); 258145256SjkoshySYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW, 259145256Sjkoshy &pmc_unprivileged_syspmcs, 0, 260145256Sjkoshy "allow unprivileged process to allocate system PMCs"); 261145256Sjkoshy 262147191Sjkoshy/* 263147191Sjkoshy * Hash function. Discard the lower 2 bits of the pointer since 264147191Sjkoshy * these are always zero for our uses. The hash multiplier is 265147191Sjkoshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 266147191Sjkoshy */ 267145256Sjkoshy 268145256Sjkoshy#if LONG_BIT == 64 269145256Sjkoshy#define _PMC_HM 11400714819323198486u 270145256Sjkoshy#elif LONG_BIT == 32 271145256Sjkoshy#define _PMC_HM 2654435769u 272145256Sjkoshy#else 273145256Sjkoshy#error Must know the size of 'long' to compile 274145256Sjkoshy#endif 275145256Sjkoshy 276145256Sjkoshy#define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 277145256Sjkoshy 278145256Sjkoshy/* 279145256Sjkoshy * Syscall structures 280145256Sjkoshy */ 281145256Sjkoshy 282145256Sjkoshy/* The `sysent' for the new syscall */ 283145256Sjkoshystatic struct sysent pmc_sysent = { 284145256Sjkoshy 2, /* sy_narg */ 285145256Sjkoshy pmc_syscall_handler /* sy_call */ 286145256Sjkoshy}; 287145256Sjkoshy 288145256Sjkoshystatic struct syscall_module_data pmc_syscall_mod = { 289145256Sjkoshy load, 290145256Sjkoshy NULL, 291145256Sjkoshy &pmc_syscall_num, 292145256Sjkoshy &pmc_sysent, 293145256Sjkoshy { 0, NULL } 294145256Sjkoshy}; 295145256Sjkoshy 296145256Sjkoshystatic moduledata_t pmc_mod = { 297145256Sjkoshy PMC_MODULE_NAME, 298145256Sjkoshy syscall_module_handler, 299145256Sjkoshy &pmc_syscall_mod 300145256Sjkoshy}; 301145256Sjkoshy 302145256SjkoshyDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 303145256SjkoshyMODULE_VERSION(pmc, PMC_VERSION); 304145256Sjkoshy 305153110Sru#ifdef DEBUG 306147191Sjkoshyenum pmc_dbgparse_state { 307147191Sjkoshy PMCDS_WS, /* in whitespace */ 308147191Sjkoshy PMCDS_MAJOR, /* seen a major keyword */ 309147191Sjkoshy PMCDS_MINOR 310147191Sjkoshy}; 311147191Sjkoshy 312145256Sjkoshystatic int 313145256Sjkoshypmc_debugflags_parse(char *newstr, char *fence) 314145256Sjkoshy{ 315145313Sjkoshy char c, *p, *q; 316147191Sjkoshy struct pmc_debugflags *tmpflags; 317147191Sjkoshy int error, found, *newbits, tmp; 318147191Sjkoshy size_t kwlen; 319145256Sjkoshy 320147191Sjkoshy MALLOC(tmpflags, struct pmc_debugflags *, sizeof(*tmpflags), 321147191Sjkoshy M_PMC, M_WAITOK|M_ZERO); 322145256Sjkoshy 323145256Sjkoshy p = newstr; 324147191Sjkoshy error = 0; 325145256Sjkoshy 326147191Sjkoshy for (; p < fence && (c = *p); p++) { 327145256Sjkoshy 328147191Sjkoshy /* skip white space */ 329147191Sjkoshy if (c == ' ' || c == '\t') 330147191Sjkoshy continue; 331147191Sjkoshy 332147191Sjkoshy /* look for a keyword followed by "=" */ 333147191Sjkoshy for (q = p; p < fence && (c = *p) && c != '='; p++) 334147191Sjkoshy ; 335147191Sjkoshy if (c != '=') { 336147191Sjkoshy error = EINVAL; 337147191Sjkoshy goto done; 338145256Sjkoshy } 339145256Sjkoshy 340147191Sjkoshy kwlen = p - q; 341147191Sjkoshy newbits = NULL; 342145256Sjkoshy 343147191Sjkoshy /* lookup flag group name */ 344147191Sjkoshy#define DBG_SET_FLAG_MAJ(S,F) \ 345147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 346147191Sjkoshy newbits = &tmpflags->pdb_ ## F; 347145256Sjkoshy 348147191Sjkoshy DBG_SET_FLAG_MAJ("cpu", CPU); 349147191Sjkoshy DBG_SET_FLAG_MAJ("csw", CSW); 350147191Sjkoshy DBG_SET_FLAG_MAJ("logging", LOG); 351147191Sjkoshy DBG_SET_FLAG_MAJ("module", MOD); 352147191Sjkoshy DBG_SET_FLAG_MAJ("md", MDP); 353147191Sjkoshy DBG_SET_FLAG_MAJ("owner", OWN); 354147191Sjkoshy DBG_SET_FLAG_MAJ("pmc", PMC); 355147191Sjkoshy DBG_SET_FLAG_MAJ("process", PRC); 356147191Sjkoshy DBG_SET_FLAG_MAJ("sampling", SAM); 357145256Sjkoshy 358147191Sjkoshy if (newbits == NULL) { 359147191Sjkoshy error = EINVAL; 360147191Sjkoshy goto done; 361145256Sjkoshy } 362145256Sjkoshy 363147191Sjkoshy p++; /* skip the '=' */ 364145256Sjkoshy 365147191Sjkoshy /* Now parse the individual flags */ 366147191Sjkoshy tmp = 0; 367147191Sjkoshy newflag: 368147191Sjkoshy for (q = p; p < fence && (c = *p); p++) 369147191Sjkoshy if (c == ' ' || c == '\t' || c == ',') 370147191Sjkoshy break; 371147191Sjkoshy 372147191Sjkoshy /* p == fence or c == ws or c == "," or c == 0 */ 373147191Sjkoshy 374147191Sjkoshy if ((kwlen = p - q) == 0) { 375147191Sjkoshy *newbits = tmp; 376147191Sjkoshy continue; 377147191Sjkoshy } 378147191Sjkoshy 379147191Sjkoshy found = 0; 380147191Sjkoshy#define DBG_SET_FLAG_MIN(S,F) \ 381147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 382147191Sjkoshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 383147191Sjkoshy 384147191Sjkoshy /* a '*' denotes all possible flags in the group */ 385147191Sjkoshy if (kwlen == 1 && *q == '*') 386147191Sjkoshy tmp = found = ~0; 387147191Sjkoshy /* look for individual flag names */ 388147191Sjkoshy DBG_SET_FLAG_MIN("allocaterow", ALR); 389147191Sjkoshy DBG_SET_FLAG_MIN("allocate", ALL); 390147191Sjkoshy DBG_SET_FLAG_MIN("attach", ATT); 391147191Sjkoshy DBG_SET_FLAG_MIN("bind", BND); 392147191Sjkoshy DBG_SET_FLAG_MIN("config", CFG); 393147191Sjkoshy DBG_SET_FLAG_MIN("exec", EXC); 394147191Sjkoshy DBG_SET_FLAG_MIN("exit", EXT); 395147191Sjkoshy DBG_SET_FLAG_MIN("find", FND); 396147191Sjkoshy DBG_SET_FLAG_MIN("flush", FLS); 397147191Sjkoshy DBG_SET_FLAG_MIN("fork", FRK); 398147191Sjkoshy DBG_SET_FLAG_MIN("getbuf", GTB); 399147191Sjkoshy DBG_SET_FLAG_MIN("hook", PMH); 400147191Sjkoshy DBG_SET_FLAG_MIN("init", INI); 401147191Sjkoshy DBG_SET_FLAG_MIN("intr", INT); 402147191Sjkoshy DBG_SET_FLAG_MIN("linktarget", TLK); 403147191Sjkoshy DBG_SET_FLAG_MIN("mayberemove", OMR); 404147191Sjkoshy DBG_SET_FLAG_MIN("ops", OPS); 405147191Sjkoshy DBG_SET_FLAG_MIN("read", REA); 406147191Sjkoshy DBG_SET_FLAG_MIN("register", REG); 407147191Sjkoshy DBG_SET_FLAG_MIN("release", REL); 408147191Sjkoshy DBG_SET_FLAG_MIN("remove", ORM); 409147191Sjkoshy DBG_SET_FLAG_MIN("sample", SAM); 410147191Sjkoshy DBG_SET_FLAG_MIN("scheduleio", SIO); 411147191Sjkoshy DBG_SET_FLAG_MIN("select", SEL); 412147191Sjkoshy DBG_SET_FLAG_MIN("signal", SIG); 413147191Sjkoshy DBG_SET_FLAG_MIN("swi", SWI); 414147191Sjkoshy DBG_SET_FLAG_MIN("swo", SWO); 415147191Sjkoshy DBG_SET_FLAG_MIN("start", STA); 416147191Sjkoshy DBG_SET_FLAG_MIN("stop", STO); 417147191Sjkoshy DBG_SET_FLAG_MIN("syscall", PMS); 418147191Sjkoshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 419147191Sjkoshy DBG_SET_FLAG_MIN("write", WRI); 420147191Sjkoshy if (found == 0) { 421147191Sjkoshy /* unrecognized flag name */ 422147191Sjkoshy error = EINVAL; 423147191Sjkoshy goto done; 424147191Sjkoshy } 425147191Sjkoshy 426147191Sjkoshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 427147191Sjkoshy *newbits = tmp; 428147191Sjkoshy continue; 429147191Sjkoshy } 430147191Sjkoshy 431147191Sjkoshy p++; 432147191Sjkoshy goto newflag; 433145256Sjkoshy } 434145256Sjkoshy 435147191Sjkoshy /* save the new flag set */ 436147191Sjkoshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 437145256Sjkoshy 438147191Sjkoshy done: 439147191Sjkoshy FREE(tmpflags, M_PMC); 440147191Sjkoshy return error; 441145256Sjkoshy} 442145256Sjkoshy 443145256Sjkoshystatic int 444145256Sjkoshypmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 445145256Sjkoshy{ 446145256Sjkoshy char *fence, *newstr; 447145256Sjkoshy int error; 448145256Sjkoshy unsigned int n; 449145256Sjkoshy 450145256Sjkoshy (void) arg1; (void) arg2; /* unused parameters */ 451145256Sjkoshy 452145256Sjkoshy n = sizeof(pmc_debugstr); 453145256Sjkoshy MALLOC(newstr, char *, n, M_PMC, M_ZERO|M_WAITOK); 454147191Sjkoshy (void) strlcpy(newstr, pmc_debugstr, n); 455145256Sjkoshy 456145256Sjkoshy error = sysctl_handle_string(oidp, newstr, n, req); 457145256Sjkoshy 458145256Sjkoshy /* if there is a new string, parse and copy it */ 459145256Sjkoshy if (error == 0 && req->newptr != NULL) { 460147191Sjkoshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 461145256Sjkoshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 462145256Sjkoshy (void) strlcpy(pmc_debugstr, newstr, 463145256Sjkoshy sizeof(pmc_debugstr)); 464145256Sjkoshy } 465145256Sjkoshy 466145256Sjkoshy FREE(newstr, M_PMC); 467145256Sjkoshy 468145256Sjkoshy return error; 469145256Sjkoshy} 470145256Sjkoshy#endif 471145256Sjkoshy 472145256Sjkoshy/* 473145256Sjkoshy * Concurrency Control 474145256Sjkoshy * 475145256Sjkoshy * The driver manages the following data structures: 476145256Sjkoshy * 477145256Sjkoshy * - target process descriptors, one per target process 478145256Sjkoshy * - owner process descriptors (and attached lists), one per owner process 479145256Sjkoshy * - lookup hash tables for owner and target processes 480145256Sjkoshy * - PMC descriptors (and attached lists) 481145256Sjkoshy * - per-cpu hardware state 482145256Sjkoshy * - the 'hook' variable through which the kernel calls into 483145256Sjkoshy * this module 484145256Sjkoshy * - the machine hardware state (managed by the MD layer) 485145256Sjkoshy * 486145256Sjkoshy * These data structures are accessed from: 487145256Sjkoshy * 488145256Sjkoshy * - thread context-switch code 489145256Sjkoshy * - interrupt handlers (possibly on multiple cpus) 490145256Sjkoshy * - kernel threads on multiple cpus running on behalf of user 491145256Sjkoshy * processes doing system calls 492145256Sjkoshy * - this driver's private kernel threads 493145256Sjkoshy * 494145256Sjkoshy * = Locks and Locking strategy = 495145256Sjkoshy * 496145256Sjkoshy * The driver uses four locking strategies for its operation: 497145256Sjkoshy * 498145256Sjkoshy * - There is a 'global' SX lock "pmc_sx" that is used to protect 499145256Sjkoshy * the its 'meta-data'. 500145256Sjkoshy * 501145256Sjkoshy * Calls into the module (via syscall() or by the kernel) start with 502145256Sjkoshy * this lock being held in exclusive mode. Depending on the requested 503145256Sjkoshy * operation, the lock may be downgraded to 'shared' mode to allow 504145256Sjkoshy * more concurrent readers into the module. 505145256Sjkoshy * 506145256Sjkoshy * This SX lock is held in exclusive mode for any operations that 507145256Sjkoshy * modify the linkages between the driver's internal data structures. 508145256Sjkoshy * 509145256Sjkoshy * The 'pmc_hook' function pointer is also protected by this lock. 510145256Sjkoshy * It is only examined with the sx lock held in exclusive mode. The 511145256Sjkoshy * kernel module is allowed to be unloaded only with the sx lock 512145256Sjkoshy * held in exclusive mode. In normal syscall handling, after 513145256Sjkoshy * acquiring the pmc_sx lock we first check that 'pmc_hook' is 514145256Sjkoshy * non-null before proceeding. This prevents races between the 515145256Sjkoshy * thread unloading the module and other threads seeking to use the 516145256Sjkoshy * module. 517145256Sjkoshy * 518145256Sjkoshy * - Lookups of target process structures and owner process structures 519145256Sjkoshy * cannot use the global "pmc_sx" SX lock because these lookups need 520145256Sjkoshy * to happen during context switches and in other critical sections 521145256Sjkoshy * where sleeping is not allowed. We protect these lookup tables 522145256Sjkoshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 523145256Sjkoshy * "pmc_ownerhash_mtx". These are 'leaf' mutexes, in that no other 524145256Sjkoshy * lock is acquired with these locks held. 525145256Sjkoshy * 526145256Sjkoshy * - Interrupt handlers work in a lock free manner. At interrupt 527145256Sjkoshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 528145256Sjkoshy * when the PMC was started. If this pointer is NULL, the interrupt 529145256Sjkoshy * is ignored after updating driver statistics. We ensure that this 530145256Sjkoshy * pointer is set (using an atomic operation if necessary) before the 531145256Sjkoshy * PMC hardware is started. Conversely, this pointer is unset atomically 532145256Sjkoshy * only after the PMC hardware is stopped. 533145256Sjkoshy * 534145256Sjkoshy * We ensure that everything needed for the operation of an 535145256Sjkoshy * interrupt handler is available without it needing to acquire any 536145256Sjkoshy * locks. We also ensure that a PMC's software state is destroyed only 537145256Sjkoshy * after the PMC is taken off hardware (on all CPUs). 538145256Sjkoshy * 539145256Sjkoshy * - Context-switch handling with process-private PMCs needs more 540145256Sjkoshy * care. 541145256Sjkoshy * 542145256Sjkoshy * A given process may be the target of multiple PMCs. For example, 543145256Sjkoshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 544145256Sjkoshy * while the target process is running on another. A PMC could also 545145256Sjkoshy * be getting released because its owner is exiting. We tackle 546145256Sjkoshy * these situations in the following manner: 547145256Sjkoshy * 548145256Sjkoshy * - each target process structure 'pmc_process' has an array 549145256Sjkoshy * of 'struct pmc *' pointers, one for each hardware PMC. 550145256Sjkoshy * 551145256Sjkoshy * - At context switch IN time, each "target" PMC in RUNNING state 552145256Sjkoshy * gets started on hardware and a pointer to each PMC is copied into 553145256Sjkoshy * the per-cpu phw array. The 'runcount' for the PMC is 554145256Sjkoshy * incremented. 555145256Sjkoshy * 556145256Sjkoshy * - At context switch OUT time, all process-virtual PMCs are stopped 557145256Sjkoshy * on hardware. The saved value is added to the PMCs value field 558145256Sjkoshy * only if the PMC is in a non-deleted state (the PMCs state could 559145256Sjkoshy * have changed during the current time slice). 560145256Sjkoshy * 561145256Sjkoshy * Note that since in-between a switch IN on a processor and a switch 562145256Sjkoshy * OUT, the PMC could have been released on another CPU. Therefore 563145256Sjkoshy * context switch OUT always looks at the hardware state to turn 564145256Sjkoshy * OFF PMCs and will update a PMC's saved value only if reachable 565145256Sjkoshy * from the target process record. 566145256Sjkoshy * 567145256Sjkoshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 568145256Sjkoshy * be attached to many processes at the time of the call and could 569145256Sjkoshy * be active on multiple CPUs). 570145256Sjkoshy * 571145256Sjkoshy * We prevent further scheduling of the PMC by marking it as in 572145256Sjkoshy * state 'DELETED'. If the runcount of the PMC is non-zero then 573145256Sjkoshy * this PMC is currently running on a CPU somewhere. The thread 574145256Sjkoshy * doing the PMCRELEASE operation waits by repeatedly doing an 575145256Sjkoshy * tsleep() till the runcount comes to zero. 576145256Sjkoshy * 577145256Sjkoshy */ 578145256Sjkoshy 579145256Sjkoshy/* 580145256Sjkoshy * save the cpu binding of the current kthread 581145256Sjkoshy */ 582145256Sjkoshy 583145256Sjkoshystatic void 584145256Sjkoshypmc_save_cpu_binding(struct pmc_binding *pb) 585145256Sjkoshy{ 586145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "save-cpu"); 587145256Sjkoshy mtx_lock_spin(&sched_lock); 588145256Sjkoshy pb->pb_bound = sched_is_bound(curthread); 589145256Sjkoshy pb->pb_cpu = curthread->td_oncpu; 590145256Sjkoshy mtx_unlock_spin(&sched_lock); 591145256Sjkoshy PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 592145256Sjkoshy} 593145256Sjkoshy 594145256Sjkoshy/* 595145256Sjkoshy * restore the cpu binding of the current thread 596145256Sjkoshy */ 597145256Sjkoshy 598145256Sjkoshystatic void 599145256Sjkoshypmc_restore_cpu_binding(struct pmc_binding *pb) 600145256Sjkoshy{ 601145256Sjkoshy PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 602145256Sjkoshy curthread->td_oncpu, pb->pb_cpu); 603145256Sjkoshy mtx_lock_spin(&sched_lock); 604145256Sjkoshy if (pb->pb_bound) 605145256Sjkoshy sched_bind(curthread, pb->pb_cpu); 606145256Sjkoshy else 607145256Sjkoshy sched_unbind(curthread); 608145256Sjkoshy mtx_unlock_spin(&sched_lock); 609145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "restore-cpu done"); 610145256Sjkoshy} 611145256Sjkoshy 612145256Sjkoshy/* 613145256Sjkoshy * move execution over the specified cpu and bind it there. 614145256Sjkoshy */ 615145256Sjkoshy 616145256Sjkoshystatic void 617145256Sjkoshypmc_select_cpu(int cpu) 618145256Sjkoshy{ 619145256Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 620145256Sjkoshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 621145256Sjkoshy 622145256Sjkoshy /* never move to a disabled CPU */ 623145256Sjkoshy KASSERT(pmc_cpu_is_disabled(cpu) == 0, ("[pmc,%d] selecting " 624145256Sjkoshy "disabled CPU %d", __LINE__, cpu)); 625145256Sjkoshy 626145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu); 627145256Sjkoshy mtx_lock_spin(&sched_lock); 628145256Sjkoshy sched_bind(curthread, cpu); 629145256Sjkoshy mtx_unlock_spin(&sched_lock); 630145256Sjkoshy 631145256Sjkoshy KASSERT(curthread->td_oncpu == cpu, 632145256Sjkoshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 633145256Sjkoshy cpu, curthread->td_oncpu)); 634145256Sjkoshy 635145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 636145256Sjkoshy} 637145256Sjkoshy 638145256Sjkoshy/* 639145774Sjkoshy * Force a context switch. 640145774Sjkoshy * 641145774Sjkoshy * We do this by tsleep'ing for 1 tick -- invoking mi_switch() is not 642145774Sjkoshy * guaranteed to force a context switch. 643145774Sjkoshy */ 644145774Sjkoshy 645145774Sjkoshystatic void 646145774Sjkoshypmc_force_context_switch(void) 647145774Sjkoshy{ 648145774Sjkoshy 649157815Sjhb (void) tsleep((void *) pmc_force_context_switch, 0, "pmcctx", 1); 650145774Sjkoshy} 651145774Sjkoshy 652145774Sjkoshy/* 653147191Sjkoshy * Get the file name for an executable. This is a simple wrapper 654147191Sjkoshy * around vn_fullpath(9). 655145256Sjkoshy */ 656145256Sjkoshy 657147191Sjkoshystatic void 658147708Sjkoshypmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 659145256Sjkoshy{ 660145256Sjkoshy struct thread *td; 661145256Sjkoshy 662147191Sjkoshy td = curthread; 663147191Sjkoshy *fullpath = "unknown"; 664147191Sjkoshy *freepath = NULL; 665148088Sjkoshy vn_lock(v, LK_CANRECURSE | LK_EXCLUSIVE | LK_RETRY, td); 666147708Sjkoshy vn_fullpath(td, v, fullpath, freepath); 667147708Sjkoshy VOP_UNLOCK(v, 0, td); 668145256Sjkoshy} 669145256Sjkoshy 670145256Sjkoshy/* 671145256Sjkoshy * remove an process owning PMCs 672145256Sjkoshy */ 673145256Sjkoshy 674145256Sjkoshyvoid 675145256Sjkoshypmc_remove_owner(struct pmc_owner *po) 676145256Sjkoshy{ 677147191Sjkoshy struct pmc *pm, *tmp; 678145256Sjkoshy 679145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 680145256Sjkoshy 681145256Sjkoshy PMCDBG(OWN,ORM,1, "remove-owner po=%p", po); 682145256Sjkoshy 683145256Sjkoshy /* Remove descriptor from the owner hash table */ 684145256Sjkoshy LIST_REMOVE(po, po_next); 685145256Sjkoshy 686147191Sjkoshy /* release all owned PMC descriptors */ 687147191Sjkoshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 688147191Sjkoshy PMCDBG(OWN,ORM,2, "pmc=%p", pm); 689147191Sjkoshy KASSERT(pm->pm_owner == po, 690147191Sjkoshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 691145256Sjkoshy 692147191Sjkoshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 693145256Sjkoshy } 694145256Sjkoshy 695147191Sjkoshy KASSERT(po->po_sscount == 0, 696147191Sjkoshy ("[pmc,%d] SS count not zero", __LINE__)); 697145256Sjkoshy KASSERT(LIST_EMPTY(&po->po_pmcs), 698147191Sjkoshy ("[pmc,%d] PMC list not empty", __LINE__)); 699145256Sjkoshy 700147191Sjkoshy /* de-configure the log file if present */ 701145774Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 702147191Sjkoshy pmclog_deconfigure_log(po); 703145256Sjkoshy} 704145256Sjkoshy 705145256Sjkoshy/* 706145256Sjkoshy * remove an owner process record if all conditions are met. 707145256Sjkoshy */ 708145256Sjkoshy 709145256Sjkoshystatic void 710145256Sjkoshypmc_maybe_remove_owner(struct pmc_owner *po) 711145256Sjkoshy{ 712145256Sjkoshy 713145256Sjkoshy PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po); 714145256Sjkoshy 715145256Sjkoshy /* 716145256Sjkoshy * Remove owner record if 717145256Sjkoshy * - this process does not own any PMCs 718145256Sjkoshy * - this process has not allocated a system-wide sampling buffer 719145256Sjkoshy */ 720145256Sjkoshy 721145256Sjkoshy if (LIST_EMPTY(&po->po_pmcs) && 722145774Sjkoshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 723145256Sjkoshy pmc_remove_owner(po); 724147191Sjkoshy pmc_destroy_owner_descriptor(po); 725145256Sjkoshy } 726145256Sjkoshy} 727145256Sjkoshy 728145256Sjkoshy/* 729145256Sjkoshy * Add an association between a target process and a PMC. 730145256Sjkoshy */ 731145256Sjkoshy 732145256Sjkoshystatic void 733145256Sjkoshypmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 734145256Sjkoshy{ 735145256Sjkoshy int ri; 736145256Sjkoshy struct pmc_target *pt; 737145256Sjkoshy 738145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 739145256Sjkoshy 740145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 741145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 742147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 743147191Sjkoshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 744147191Sjkoshy __LINE__, pm, pp->pp_proc->p_pid)); 745145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < ((int) md->pmd_npmc - 1), 746145256Sjkoshy ("[pmc,%d] Illegal reference count %d for process record %p", 747145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 748145256Sjkoshy 749145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 750145256Sjkoshy 751145256Sjkoshy PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 752145256Sjkoshy pm, ri, pp); 753145256Sjkoshy 754153110Sru#ifdef DEBUG 755145256Sjkoshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 756145256Sjkoshy if (pt->pt_process == pp) 757145256Sjkoshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 758145256Sjkoshy __LINE__, pp, pm)); 759145256Sjkoshy#endif 760145256Sjkoshy 761145256Sjkoshy MALLOC(pt, struct pmc_target *, sizeof(struct pmc_target), 762145256Sjkoshy M_PMC, M_ZERO|M_WAITOK); 763145256Sjkoshy 764145256Sjkoshy pt->pt_process = pp; 765145256Sjkoshy 766145256Sjkoshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 767145256Sjkoshy 768148067Sjhb atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 769148067Sjhb (uintptr_t)pm); 770145256Sjkoshy 771145615Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) 772145774Sjkoshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 773145615Sjkoshy 774147191Sjkoshy /* 775147191Sjkoshy * Initialize the per-process values at this row index. 776147191Sjkoshy */ 777147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 778147191Sjkoshy pm->pm_sc.pm_reloadcount : 0; 779147191Sjkoshy 780145256Sjkoshy pp->pp_refcnt++; 781145256Sjkoshy 782145256Sjkoshy} 783145256Sjkoshy 784145256Sjkoshy/* 785145256Sjkoshy * Removes the association between a target process and a PMC. 786145256Sjkoshy */ 787145256Sjkoshy 788145256Sjkoshystatic void 789145256Sjkoshypmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 790145256Sjkoshy{ 791145256Sjkoshy int ri; 792147191Sjkoshy struct proc *p; 793145256Sjkoshy struct pmc_target *ptgt; 794145256Sjkoshy 795145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 796145256Sjkoshy 797145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 798145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 799145256Sjkoshy 800145256Sjkoshy KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt < (int) md->pmd_npmc, 801145256Sjkoshy ("[pmc,%d] Illegal ref count %d on process record %p", 802145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 803145256Sjkoshy 804145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 805145256Sjkoshy 806145256Sjkoshy PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 807145256Sjkoshy pm, ri, pp); 808145256Sjkoshy 809145256Sjkoshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 810145256Sjkoshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 811145256Sjkoshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 812145256Sjkoshy 813145256Sjkoshy pp->pp_pmcs[ri].pp_pmc = NULL; 814145256Sjkoshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 815145256Sjkoshy 816145774Sjkoshy /* Remove owner-specific flags */ 817145774Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) { 818145774Sjkoshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 819145774Sjkoshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 820145774Sjkoshy } 821145615Sjkoshy 822145256Sjkoshy pp->pp_refcnt--; 823145256Sjkoshy 824145256Sjkoshy /* Remove the target process from the PMC structure */ 825145256Sjkoshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 826145256Sjkoshy if (ptgt->pt_process == pp) 827145256Sjkoshy break; 828145256Sjkoshy 829145256Sjkoshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 830145256Sjkoshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 831145256Sjkoshy 832145256Sjkoshy LIST_REMOVE(ptgt, pt_next); 833145256Sjkoshy FREE(ptgt, M_PMC); 834145256Sjkoshy 835147191Sjkoshy /* if the PMC now lacks targets, send the owner a SIGIO */ 836147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) { 837147191Sjkoshy p = pm->pm_owner->po_owner; 838147191Sjkoshy PROC_LOCK(p); 839147191Sjkoshy psignal(p, SIGIO); 840147191Sjkoshy PROC_UNLOCK(p); 841145256Sjkoshy 842147191Sjkoshy PMCDBG(PRC,SIG,2, "signalling proc=%p signal=%d", p, 843147191Sjkoshy SIGIO); 844145256Sjkoshy } 845145256Sjkoshy} 846145256Sjkoshy 847145256Sjkoshy/* 848145256Sjkoshy * Check if PMC 'pm' may be attached to target process 't'. 849145256Sjkoshy */ 850145256Sjkoshy 851145256Sjkoshystatic int 852145256Sjkoshypmc_can_attach(struct pmc *pm, struct proc *t) 853145256Sjkoshy{ 854145256Sjkoshy struct proc *o; /* pmc owner */ 855145256Sjkoshy struct ucred *oc, *tc; /* owner, target credentials */ 856145256Sjkoshy int decline_attach, i; 857145256Sjkoshy 858145256Sjkoshy /* 859145256Sjkoshy * A PMC's owner can always attach that PMC to itself. 860145256Sjkoshy */ 861145256Sjkoshy 862145256Sjkoshy if ((o = pm->pm_owner->po_owner) == t) 863145256Sjkoshy return 0; 864145256Sjkoshy 865145256Sjkoshy PROC_LOCK(o); 866145256Sjkoshy oc = o->p_ucred; 867145256Sjkoshy crhold(oc); 868145256Sjkoshy PROC_UNLOCK(o); 869145256Sjkoshy 870145256Sjkoshy PROC_LOCK(t); 871145256Sjkoshy tc = t->p_ucred; 872145256Sjkoshy crhold(tc); 873145256Sjkoshy PROC_UNLOCK(t); 874145256Sjkoshy 875145256Sjkoshy /* 876145256Sjkoshy * The effective uid of the PMC owner should match at least one 877145256Sjkoshy * of the {effective,real,saved} uids of the target process. 878145256Sjkoshy */ 879145256Sjkoshy 880145256Sjkoshy decline_attach = oc->cr_uid != tc->cr_uid && 881145256Sjkoshy oc->cr_uid != tc->cr_svuid && 882145256Sjkoshy oc->cr_uid != tc->cr_ruid; 883145256Sjkoshy 884145256Sjkoshy /* 885145256Sjkoshy * Every one of the target's group ids, must be in the owner's 886145256Sjkoshy * group list. 887145256Sjkoshy */ 888145256Sjkoshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 889145256Sjkoshy decline_attach = !groupmember(tc->cr_groups[i], oc); 890145256Sjkoshy 891145256Sjkoshy /* check the read and saved gids too */ 892145256Sjkoshy if (decline_attach == 0) 893145256Sjkoshy decline_attach = !groupmember(tc->cr_rgid, oc) || 894145256Sjkoshy !groupmember(tc->cr_svgid, oc); 895145256Sjkoshy 896145256Sjkoshy crfree(tc); 897145256Sjkoshy crfree(oc); 898145256Sjkoshy 899145256Sjkoshy return !decline_attach; 900145256Sjkoshy} 901145256Sjkoshy 902145256Sjkoshy/* 903145256Sjkoshy * Attach a process to a PMC. 904145256Sjkoshy */ 905145256Sjkoshy 906145256Sjkoshystatic int 907145256Sjkoshypmc_attach_one_process(struct proc *p, struct pmc *pm) 908145256Sjkoshy{ 909145256Sjkoshy int ri; 910147191Sjkoshy char *fullpath, *freepath; 911145256Sjkoshy struct pmc_process *pp; 912145256Sjkoshy 913145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 914145256Sjkoshy 915145256Sjkoshy PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 916145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 917145256Sjkoshy 918145256Sjkoshy /* 919145256Sjkoshy * Locate the process descriptor corresponding to process 'p', 920145256Sjkoshy * allocating space as needed. 921145256Sjkoshy * 922145256Sjkoshy * Verify that rowindex 'pm_rowindex' is free in the process 923145256Sjkoshy * descriptor. 924145256Sjkoshy * 925145256Sjkoshy * If not, allocate space for a descriptor and link the 926145256Sjkoshy * process descriptor and PMC. 927145256Sjkoshy */ 928145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 929145256Sjkoshy 930145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 931145256Sjkoshy return ENOMEM; 932145256Sjkoshy 933145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 934145256Sjkoshy return EEXIST; 935145256Sjkoshy 936145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 937145256Sjkoshy return EBUSY; 938145256Sjkoshy 939145256Sjkoshy pmc_link_target_process(pm, pp); 940145256Sjkoshy 941147191Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 942147191Sjkoshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 943147191Sjkoshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 944147191Sjkoshy 945147191Sjkoshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 946147191Sjkoshy 947147191Sjkoshy /* issue an attach event to a configured log file */ 948147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 949147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 950147191Sjkoshy pmclog_process_pmcattach(pm, p->p_pid, fullpath); 951147191Sjkoshy if (freepath) 952147191Sjkoshy FREE(freepath, M_TEMP); 953147191Sjkoshy } 954145256Sjkoshy /* mark process as using HWPMCs */ 955145256Sjkoshy PROC_LOCK(p); 956145256Sjkoshy p->p_flag |= P_HWPMC; 957145256Sjkoshy PROC_UNLOCK(p); 958145256Sjkoshy 959145256Sjkoshy return 0; 960145256Sjkoshy} 961145256Sjkoshy 962145256Sjkoshy/* 963145256Sjkoshy * Attach a process and optionally its children 964145256Sjkoshy */ 965145256Sjkoshy 966145256Sjkoshystatic int 967145256Sjkoshypmc_attach_process(struct proc *p, struct pmc *pm) 968145256Sjkoshy{ 969145256Sjkoshy int error; 970145256Sjkoshy struct proc *top; 971145256Sjkoshy 972145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 973145256Sjkoshy 974145256Sjkoshy PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 975145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 976145256Sjkoshy 977145774Sjkoshy 978145774Sjkoshy /* 979145774Sjkoshy * If this PMC successfully allowed a GETMSR operation 980145774Sjkoshy * in the past, disallow further ATTACHes. 981145774Sjkoshy */ 982145774Sjkoshy 983145774Sjkoshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 984145774Sjkoshy return EPERM; 985145774Sjkoshy 986145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 987145256Sjkoshy return pmc_attach_one_process(p, pm); 988145256Sjkoshy 989145256Sjkoshy /* 990145256Sjkoshy * Traverse all child processes, attaching them to 991145256Sjkoshy * this PMC. 992145256Sjkoshy */ 993145256Sjkoshy 994145256Sjkoshy sx_slock(&proctree_lock); 995145256Sjkoshy 996145256Sjkoshy top = p; 997145256Sjkoshy 998145256Sjkoshy for (;;) { 999145256Sjkoshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1000145256Sjkoshy break; 1001145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1002145256Sjkoshy p = LIST_FIRST(&p->p_children); 1003145256Sjkoshy else for (;;) { 1004145256Sjkoshy if (p == top) 1005145256Sjkoshy goto done; 1006145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1007145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1008145256Sjkoshy break; 1009145256Sjkoshy } 1010145256Sjkoshy p = p->p_pptr; 1011145256Sjkoshy } 1012145256Sjkoshy } 1013145256Sjkoshy 1014145256Sjkoshy if (error) 1015145256Sjkoshy (void) pmc_detach_process(top, pm); 1016145256Sjkoshy 1017145256Sjkoshy done: 1018145256Sjkoshy sx_sunlock(&proctree_lock); 1019145256Sjkoshy return error; 1020145256Sjkoshy} 1021145256Sjkoshy 1022145256Sjkoshy/* 1023145256Sjkoshy * Detach a process from a PMC. If there are no other PMCs tracking 1024145256Sjkoshy * this process, remove the process structure from its hash table. If 1025145256Sjkoshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1026145256Sjkoshy */ 1027145256Sjkoshy 1028145256Sjkoshystatic int 1029145256Sjkoshypmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1030145256Sjkoshy{ 1031145256Sjkoshy int ri; 1032145256Sjkoshy struct pmc_process *pp; 1033145256Sjkoshy 1034145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1035145256Sjkoshy 1036145256Sjkoshy KASSERT(pm != NULL, 1037145256Sjkoshy ("[pmc,%d] null pm pointer", __LINE__)); 1038145256Sjkoshy 1039145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1040145774Sjkoshy 1041145256Sjkoshy PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1042145774Sjkoshy pm, ri, p, p->p_pid, p->p_comm, flags); 1043145256Sjkoshy 1044145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1045145256Sjkoshy return ESRCH; 1046145256Sjkoshy 1047145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1048145256Sjkoshy return EINVAL; 1049145256Sjkoshy 1050145256Sjkoshy pmc_unlink_target_process(pm, pp); 1051145256Sjkoshy 1052147191Sjkoshy /* Issue a detach entry if a log file is configured */ 1053147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1054147191Sjkoshy pmclog_process_pmcdetach(pm, p->p_pid); 1055147191Sjkoshy 1056145256Sjkoshy /* 1057145256Sjkoshy * If there are no PMCs targetting this process, we remove its 1058145256Sjkoshy * descriptor from the target hash table and unset the P_HWPMC 1059145256Sjkoshy * flag in the struct proc. 1060145256Sjkoshy */ 1061145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1062145256Sjkoshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1063145256Sjkoshy __LINE__, pp->pp_refcnt, pp)); 1064145256Sjkoshy 1065145256Sjkoshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1066145256Sjkoshy return 0; 1067145256Sjkoshy 1068145256Sjkoshy pmc_remove_process_descriptor(pp); 1069145256Sjkoshy 1070145256Sjkoshy if (flags & PMC_FLAG_REMOVE) 1071145256Sjkoshy FREE(pp, M_PMC); 1072145256Sjkoshy 1073145256Sjkoshy PROC_LOCK(p); 1074145256Sjkoshy p->p_flag &= ~P_HWPMC; 1075145256Sjkoshy PROC_UNLOCK(p); 1076145256Sjkoshy 1077145256Sjkoshy return 0; 1078145256Sjkoshy} 1079145256Sjkoshy 1080145256Sjkoshy/* 1081145256Sjkoshy * Detach a process and optionally its descendants from a PMC. 1082145256Sjkoshy */ 1083145256Sjkoshy 1084145256Sjkoshystatic int 1085145256Sjkoshypmc_detach_process(struct proc *p, struct pmc *pm) 1086145256Sjkoshy{ 1087145256Sjkoshy struct proc *top; 1088145256Sjkoshy 1089145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1090145256Sjkoshy 1091145256Sjkoshy PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1092145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1093145256Sjkoshy 1094145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1095145256Sjkoshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1096145256Sjkoshy 1097145256Sjkoshy /* 1098145256Sjkoshy * Traverse all children, detaching them from this PMC. We 1099145256Sjkoshy * ignore errors since we could be detaching a PMC from a 1100145256Sjkoshy * partially attached proc tree. 1101145256Sjkoshy */ 1102145256Sjkoshy 1103145256Sjkoshy sx_slock(&proctree_lock); 1104145256Sjkoshy 1105145256Sjkoshy top = p; 1106145256Sjkoshy 1107145256Sjkoshy for (;;) { 1108145256Sjkoshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1109145256Sjkoshy 1110145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1111145256Sjkoshy p = LIST_FIRST(&p->p_children); 1112145256Sjkoshy else for (;;) { 1113145256Sjkoshy if (p == top) 1114145256Sjkoshy goto done; 1115145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1116145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1117145256Sjkoshy break; 1118145256Sjkoshy } 1119145256Sjkoshy p = p->p_pptr; 1120145256Sjkoshy } 1121145256Sjkoshy } 1122145256Sjkoshy 1123145256Sjkoshy done: 1124145256Sjkoshy sx_sunlock(&proctree_lock); 1125147191Sjkoshy 1126147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 1127147191Sjkoshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1128147191Sjkoshy 1129145256Sjkoshy return 0; 1130145256Sjkoshy} 1131145256Sjkoshy 1132147191Sjkoshy 1133145256Sjkoshy/* 1134147191Sjkoshy * Thread context switch IN 1135145256Sjkoshy */ 1136145256Sjkoshy 1137147191Sjkoshystatic void 1138147191Sjkoshypmc_process_csw_in(struct thread *td) 1139147191Sjkoshy{ 1140147191Sjkoshy int cpu; 1141147191Sjkoshy unsigned int ri; 1142147191Sjkoshy struct pmc *pm; 1143147191Sjkoshy struct proc *p; 1144147191Sjkoshy struct pmc_cpu *pc; 1145147191Sjkoshy struct pmc_hw *phw; 1146147191Sjkoshy struct pmc_process *pp; 1147147191Sjkoshy pmc_value_t newvalue; 1148145256Sjkoshy 1149147191Sjkoshy p = td->td_proc; 1150145256Sjkoshy 1151147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1152147191Sjkoshy return; 1153145256Sjkoshy 1154147191Sjkoshy KASSERT(pp->pp_proc == td->td_proc, 1155147191Sjkoshy ("[pmc,%d] not my thread state", __LINE__)); 1156145256Sjkoshy 1157147191Sjkoshy critical_enter(); /* no preemption from this point */ 1158145256Sjkoshy 1159147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1160145256Sjkoshy 1161147191Sjkoshy PMCDBG(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1162147191Sjkoshy p->p_pid, p->p_comm, pp); 1163145256Sjkoshy 1164147191Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1165147191Sjkoshy ("[pmc,%d] wierd CPU id %d", __LINE__, cpu)); 1166145256Sjkoshy 1167147191Sjkoshy pc = pmc_pcpu[cpu]; 1168145256Sjkoshy 1169147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1170145256Sjkoshy 1171147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1172147191Sjkoshy continue; 1173147191Sjkoshy 1174147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1175147191Sjkoshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1176147191Sjkoshy __LINE__, PMC_TO_MODE(pm))); 1177147191Sjkoshy 1178147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1179147191Sjkoshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1180147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1181147191Sjkoshy 1182145256Sjkoshy /* 1183147191Sjkoshy * Only PMCs that are marked as 'RUNNING' need 1184147191Sjkoshy * be placed on hardware. 1185145256Sjkoshy */ 1186145256Sjkoshy 1187147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 1188147191Sjkoshy continue; 1189145256Sjkoshy 1190147191Sjkoshy /* increment PMC runcount */ 1191147191Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); 1192145256Sjkoshy 1193147191Sjkoshy /* configure the HWPMC we are going to use. */ 1194147191Sjkoshy md->pmd_config_pmc(cpu, ri, pm); 1195145256Sjkoshy 1196147191Sjkoshy phw = pc->pc_hwpmcs[ri]; 1197145256Sjkoshy 1198147191Sjkoshy KASSERT(phw != NULL, 1199147191Sjkoshy ("[pmc,%d] null hw pointer", __LINE__)); 1200145256Sjkoshy 1201147191Sjkoshy KASSERT(phw->phw_pmc == pm, 1202147191Sjkoshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1203147191Sjkoshy phw->phw_pmc, pm)); 1204145256Sjkoshy 1205147191Sjkoshy /* 1206147191Sjkoshy * Write out saved value and start the PMC. 1207147191Sjkoshy * 1208147191Sjkoshy * Sampling PMCs use a per-process value, while 1209147191Sjkoshy * counting mode PMCs use a per-pmc value that is 1210147191Sjkoshy * inherited across descendants. 1211147191Sjkoshy */ 1212147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1213147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1214147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1215147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval; 1216147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1217147191Sjkoshy } else { 1218147191Sjkoshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1219147191Sjkoshy ("[pmc,%d] illegal mode=%d", __LINE__, 1220147191Sjkoshy PMC_TO_MODE(pm))); 1221147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1222147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1223147191Sjkoshy pm->pm_gv.pm_savedvalue; 1224147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1225147191Sjkoshy } 1226145256Sjkoshy 1227147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1228145256Sjkoshy 1229147191Sjkoshy md->pmd_write_pmc(cpu, ri, newvalue); 1230147191Sjkoshy md->pmd_start_pmc(cpu, ri); 1231147191Sjkoshy } 1232145256Sjkoshy 1233147191Sjkoshy /* 1234147191Sjkoshy * perform any other architecture/cpu dependent thread 1235147191Sjkoshy * switch-in actions. 1236147191Sjkoshy */ 1237145256Sjkoshy 1238147191Sjkoshy (void) (*md->pmd_switch_in)(pc, pp); 1239145256Sjkoshy 1240147191Sjkoshy critical_exit(); 1241145256Sjkoshy 1242147191Sjkoshy} 1243145256Sjkoshy 1244147191Sjkoshy/* 1245147191Sjkoshy * Thread context switch OUT. 1246147191Sjkoshy */ 1247145256Sjkoshy 1248147191Sjkoshystatic void 1249147191Sjkoshypmc_process_csw_out(struct thread *td) 1250147191Sjkoshy{ 1251147191Sjkoshy int cpu; 1252147191Sjkoshy enum pmc_mode mode; 1253147191Sjkoshy unsigned int ri; 1254147191Sjkoshy struct pmc *pm; 1255147191Sjkoshy struct proc *p; 1256147191Sjkoshy struct pmc_cpu *pc; 1257147191Sjkoshy struct pmc_process *pp; 1258147191Sjkoshy int64_t tmp; 1259147191Sjkoshy pmc_value_t newvalue; 1260145256Sjkoshy 1261147191Sjkoshy /* 1262147191Sjkoshy * Locate our process descriptor; this may be NULL if 1263147191Sjkoshy * this process is exiting and we have already removed 1264147191Sjkoshy * the process from the target process table. 1265147191Sjkoshy * 1266147191Sjkoshy * Note that due to kernel preemption, multiple 1267147191Sjkoshy * context switches may happen while the process is 1268147191Sjkoshy * exiting. 1269147191Sjkoshy * 1270147191Sjkoshy * Note also that if the target process cannot be 1271147191Sjkoshy * found we still need to deconfigure any PMCs that 1272147191Sjkoshy * are currently running on hardware. 1273147191Sjkoshy */ 1274145256Sjkoshy 1275147191Sjkoshy p = td->td_proc; 1276147191Sjkoshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1277145256Sjkoshy 1278147191Sjkoshy /* 1279147191Sjkoshy * save PMCs 1280147191Sjkoshy */ 1281145256Sjkoshy 1282147191Sjkoshy critical_enter(); 1283145774Sjkoshy 1284147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1285145256Sjkoshy 1286147191Sjkoshy PMCDBG(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1287147191Sjkoshy p->p_pid, p->p_comm, pp); 1288145615Sjkoshy 1289147191Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1290147191Sjkoshy ("[pmc,%d wierd CPU id %d", __LINE__, cpu)); 1291145615Sjkoshy 1292147191Sjkoshy pc = pmc_pcpu[cpu]; 1293145615Sjkoshy 1294147191Sjkoshy /* 1295147191Sjkoshy * When a PMC gets unlinked from a target PMC, it will 1296147191Sjkoshy * be removed from the target's pp_pmc[] array. 1297147191Sjkoshy * 1298147191Sjkoshy * However, on a MP system, the target could have been 1299147191Sjkoshy * executing on another CPU at the time of the unlink. 1300147191Sjkoshy * So, at context switch OUT time, we need to look at 1301147191Sjkoshy * the hardware to determine if a PMC is scheduled on 1302147191Sjkoshy * it. 1303147191Sjkoshy */ 1304145256Sjkoshy 1305147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1306145256Sjkoshy 1307147191Sjkoshy pm = NULL; 1308147191Sjkoshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 1309145256Sjkoshy 1310147191Sjkoshy if (pm == NULL) /* nothing at this row index */ 1311147191Sjkoshy continue; 1312145256Sjkoshy 1313147191Sjkoshy mode = PMC_TO_MODE(pm); 1314147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1315147191Sjkoshy continue; /* not a process virtual PMC */ 1316145774Sjkoshy 1317147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1318147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1319147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1320145256Sjkoshy 1321147191Sjkoshy /* Stop hardware if not already stopped */ 1322147867Sjkoshy if (pm->pm_stalled == 0) 1323147191Sjkoshy md->pmd_stop_pmc(cpu, ri); 1324147191Sjkoshy 1325147191Sjkoshy /* reduce this PMC's runcount */ 1326147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 1327147191Sjkoshy 1328145256Sjkoshy /* 1329147191Sjkoshy * If this PMC is associated with this process, 1330147191Sjkoshy * save the reading. 1331145256Sjkoshy */ 1332145256Sjkoshy 1333147191Sjkoshy if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) { 1334147191Sjkoshy 1335147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1336147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1337147191Sjkoshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1338147191Sjkoshy 1339147191Sjkoshy KASSERT(pp->pp_refcnt > 0, 1340147191Sjkoshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1341147191Sjkoshy pp->pp_refcnt)); 1342147191Sjkoshy 1343147191Sjkoshy md->pmd_read_pmc(cpu, ri, &newvalue); 1344147191Sjkoshy 1345147191Sjkoshy tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1346147191Sjkoshy 1347147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d tmp=%jd", cpu, ri, 1348147191Sjkoshy tmp); 1349147191Sjkoshy 1350147191Sjkoshy if (mode == PMC_MODE_TS) { 1351147191Sjkoshy 1352147191Sjkoshy /* 1353147191Sjkoshy * For sampling process-virtual PMCs, 1354147191Sjkoshy * we expect the count to be 1355147191Sjkoshy * decreasing as the 'value' 1356147191Sjkoshy * programmed into the PMC is the 1357147191Sjkoshy * number of events to be seen till 1358147191Sjkoshy * the next sampling interrupt. 1359147191Sjkoshy */ 1360147191Sjkoshy if (tmp < 0) 1361147191Sjkoshy tmp += pm->pm_sc.pm_reloadcount; 1362147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1363147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval -= tmp; 1364147191Sjkoshy if ((int64_t) pp->pp_pmcs[ri].pp_pmcval < 0) 1365147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += 1366147191Sjkoshy pm->pm_sc.pm_reloadcount; 1367147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1368147191Sjkoshy 1369147191Sjkoshy } else { 1370147191Sjkoshy 1371147191Sjkoshy /* 1372147191Sjkoshy * For counting process-virtual PMCs, 1373147191Sjkoshy * we expect the count to be 1374147191Sjkoshy * increasing monotonically, modulo a 64 1375147191Sjkoshy * bit wraparound. 1376147191Sjkoshy */ 1377147191Sjkoshy KASSERT((int64_t) tmp >= 0, 1378147191Sjkoshy ("[pmc,%d] negative increment cpu=%d " 1379147191Sjkoshy "ri=%d newvalue=%jx saved=%jx " 1380147191Sjkoshy "incr=%jx", __LINE__, cpu, ri, 1381147191Sjkoshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1382147191Sjkoshy 1383147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1384147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 1385147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1386147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1387147191Sjkoshy 1388147191Sjkoshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1389147191Sjkoshy pmclog_process_proccsw(pm, pp, tmp); 1390147191Sjkoshy } 1391145256Sjkoshy } 1392145256Sjkoshy 1393147191Sjkoshy /* mark hardware as free */ 1394147191Sjkoshy md->pmd_config_pmc(cpu, ri, NULL); 1395145256Sjkoshy } 1396145256Sjkoshy 1397145256Sjkoshy /* 1398147191Sjkoshy * perform any other architecture/cpu dependent thread 1399147191Sjkoshy * switch out functions. 1400147191Sjkoshy */ 1401147191Sjkoshy 1402147191Sjkoshy (void) (*md->pmd_switch_out)(pc, pp); 1403147191Sjkoshy 1404147191Sjkoshy critical_exit(); 1405147191Sjkoshy} 1406147191Sjkoshy 1407147191Sjkoshy/* 1408157144Sjkoshy * Log a KLD operation. 1409157144Sjkoshy */ 1410157144Sjkoshy 1411157144Sjkoshystatic void 1412157144Sjkoshypmc_process_kld_load(struct pmckern_map_in *pkm) 1413157144Sjkoshy{ 1414157144Sjkoshy struct pmc_owner *po; 1415157144Sjkoshy 1416157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1417157144Sjkoshy 1418157144Sjkoshy /* 1419157144Sjkoshy * Notify owners of system sampling PMCs about KLD operations. 1420157144Sjkoshy */ 1421157144Sjkoshy 1422157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1423157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1424157144Sjkoshy pmclog_process_map_in(po, (pid_t) -1, pkm->pm_address, 1425157144Sjkoshy (char *) pkm->pm_file); 1426157144Sjkoshy 1427157144Sjkoshy /* 1428157144Sjkoshy * TODO: Notify owners of (all) process-sampling PMCs too. 1429157144Sjkoshy */ 1430157144Sjkoshy 1431157144Sjkoshy return; 1432157144Sjkoshy} 1433157144Sjkoshy 1434157144Sjkoshystatic void 1435157144Sjkoshypmc_process_kld_unload(struct pmckern_map_out *pkm) 1436157144Sjkoshy{ 1437157144Sjkoshy struct pmc_owner *po; 1438157144Sjkoshy 1439157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1440157144Sjkoshy 1441157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1442157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1443157144Sjkoshy pmclog_process_map_out(po, (pid_t) -1, 1444157144Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1445157144Sjkoshy 1446157144Sjkoshy /* 1447157144Sjkoshy * TODO: Notify owners of process-sampling PMCs. 1448157144Sjkoshy */ 1449157144Sjkoshy} 1450157144Sjkoshy 1451157144Sjkoshy/* 1452157144Sjkoshy * A mapping change for a process. 1453157144Sjkoshy */ 1454157144Sjkoshy 1455157144Sjkoshystatic void 1456157144Sjkoshypmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm) 1457157144Sjkoshy{ 1458157144Sjkoshy int ri; 1459157144Sjkoshy pid_t pid; 1460157144Sjkoshy char *fullpath, *freepath; 1461157144Sjkoshy const struct pmc *pm; 1462157144Sjkoshy struct pmc_owner *po; 1463157144Sjkoshy const struct pmc_process *pp; 1464157144Sjkoshy 1465157144Sjkoshy freepath = fullpath = NULL; 1466157144Sjkoshy pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath); 1467157144Sjkoshy 1468157144Sjkoshy pid = td->td_proc->p_pid; 1469157144Sjkoshy 1470157144Sjkoshy /* Inform owners of all system-wide sampling PMCs. */ 1471157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1472157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1473157144Sjkoshy pmclog_process_map_in(po, pid, pkm->pm_address, fullpath); 1474157144Sjkoshy 1475157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1476157144Sjkoshy goto done; 1477157144Sjkoshy 1478157144Sjkoshy /* 1479157144Sjkoshy * Inform sampling PMC owners tracking this process. 1480157144Sjkoshy */ 1481157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1482157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1483157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1484157144Sjkoshy pmclog_process_map_in(pm->pm_owner, 1485157144Sjkoshy pid, pkm->pm_address, fullpath); 1486157144Sjkoshy 1487157144Sjkoshy done: 1488157144Sjkoshy if (freepath) 1489157144Sjkoshy FREE(freepath, M_TEMP); 1490157144Sjkoshy} 1491157144Sjkoshy 1492157144Sjkoshy 1493157144Sjkoshy/* 1494157144Sjkoshy * Log an munmap request. 1495157144Sjkoshy */ 1496157144Sjkoshy 1497157144Sjkoshystatic void 1498157144Sjkoshypmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm) 1499157144Sjkoshy{ 1500157144Sjkoshy int ri; 1501157144Sjkoshy pid_t pid; 1502157144Sjkoshy struct pmc_owner *po; 1503157144Sjkoshy const struct pmc *pm; 1504157144Sjkoshy const struct pmc_process *pp; 1505157144Sjkoshy 1506157144Sjkoshy pid = td->td_proc->p_pid; 1507157144Sjkoshy 1508157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1509157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1510157144Sjkoshy pmclog_process_map_out(po, pid, pkm->pm_address, 1511157144Sjkoshy pkm->pm_address + pkm->pm_size); 1512157144Sjkoshy 1513157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1514157144Sjkoshy return; 1515157144Sjkoshy 1516157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1517157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1518157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1519157651Sjkoshy pmclog_process_map_out(pm->pm_owner, pid, 1520157651Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1521157144Sjkoshy} 1522157144Sjkoshy 1523157144Sjkoshy/* 1524147191Sjkoshy * The 'hook' invoked from the kernel proper 1525147191Sjkoshy */ 1526147191Sjkoshy 1527147191Sjkoshy 1528153110Sru#ifdef DEBUG 1529147191Sjkoshyconst char *pmc_hooknames[] = { 1530157144Sjkoshy /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */ 1531147191Sjkoshy "", 1532147191Sjkoshy "EXEC", 1533147191Sjkoshy "CSW-IN", 1534147191Sjkoshy "CSW-OUT", 1535157144Sjkoshy "SAMPLE", 1536157144Sjkoshy "KLDLOAD", 1537157144Sjkoshy "KLDUNLOAD", 1538157144Sjkoshy "MMAP", 1539157144Sjkoshy "MUNMAP" 1540147191Sjkoshy}; 1541147191Sjkoshy#endif 1542147191Sjkoshy 1543147191Sjkoshystatic int 1544147191Sjkoshypmc_hook_handler(struct thread *td, int function, void *arg) 1545147191Sjkoshy{ 1546147191Sjkoshy 1547147191Sjkoshy PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1548147191Sjkoshy pmc_hooknames[function], arg); 1549147191Sjkoshy 1550147191Sjkoshy switch (function) 1551147191Sjkoshy { 1552147191Sjkoshy 1553147191Sjkoshy /* 1554145256Sjkoshy * Process exec() 1555145256Sjkoshy */ 1556145256Sjkoshy 1557145256Sjkoshy case PMC_FN_PROCESS_EXEC: 1558145256Sjkoshy { 1559147191Sjkoshy char *fullpath, *freepath; 1560145256Sjkoshy unsigned int ri; 1561147191Sjkoshy int is_using_hwpmcs; 1562145256Sjkoshy struct pmc *pm; 1563145256Sjkoshy struct proc *p; 1564145256Sjkoshy struct pmc_owner *po; 1565145256Sjkoshy struct pmc_process *pp; 1566147708Sjkoshy struct pmckern_procexec *pk; 1567145256Sjkoshy 1568145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1569145256Sjkoshy 1570147191Sjkoshy p = td->td_proc; 1571147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1572147191Sjkoshy 1573147708Sjkoshy pk = (struct pmckern_procexec *) arg; 1574147708Sjkoshy 1575147191Sjkoshy /* Inform owners of SS mode PMCs of the exec event. */ 1576147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1577147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1578147708Sjkoshy pmclog_process_procexec(po, PMC_ID_INVALID, 1579147708Sjkoshy p->p_pid, pk->pm_entryaddr, fullpath); 1580147191Sjkoshy 1581147191Sjkoshy PROC_LOCK(p); 1582147191Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1583147191Sjkoshy PROC_UNLOCK(p); 1584147191Sjkoshy 1585147191Sjkoshy if (!is_using_hwpmcs) { 1586147191Sjkoshy if (freepath) 1587147191Sjkoshy FREE(freepath, M_TEMP); 1588147191Sjkoshy break; 1589147191Sjkoshy } 1590147191Sjkoshy 1591145256Sjkoshy /* 1592145256Sjkoshy * PMCs are not inherited across an exec(): remove any 1593145256Sjkoshy * PMCs that this process is the owner of. 1594145256Sjkoshy */ 1595145256Sjkoshy 1596145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1597145256Sjkoshy pmc_remove_owner(po); 1598147191Sjkoshy pmc_destroy_owner_descriptor(po); 1599145256Sjkoshy } 1600145256Sjkoshy 1601145256Sjkoshy /* 1602154483Sjkoshy * If the process being exec'ed is not the target of any 1603154483Sjkoshy * PMC, we are done. 1604145256Sjkoshy */ 1605154483Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 1606154483Sjkoshy if (freepath) 1607154483Sjkoshy FREE(freepath, M_TEMP); 1608145256Sjkoshy break; 1609154483Sjkoshy } 1610145256Sjkoshy 1611147191Sjkoshy /* 1612147191Sjkoshy * Log the exec event to all monitoring owners. Skip 1613147191Sjkoshy * owners who have already recieved the event because 1614154483Sjkoshy * they had system sampling PMCs active. 1615147191Sjkoshy */ 1616147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1617147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1618147191Sjkoshy po = pm->pm_owner; 1619147191Sjkoshy if (po->po_sscount == 0 && 1620147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 1621147708Sjkoshy pmclog_process_procexec(po, pm->pm_id, 1622147708Sjkoshy p->p_pid, pk->pm_entryaddr, 1623147191Sjkoshy fullpath); 1624147191Sjkoshy } 1625147191Sjkoshy 1626147191Sjkoshy if (freepath) 1627147191Sjkoshy FREE(freepath, M_TEMP); 1628147191Sjkoshy 1629145256Sjkoshy 1630145256Sjkoshy PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 1631147708Sjkoshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1632145256Sjkoshy 1633147708Sjkoshy if (pk->pm_credentialschanged == 0) /* no change */ 1634145256Sjkoshy break; 1635145256Sjkoshy 1636145256Sjkoshy /* 1637145256Sjkoshy * If the newly exec()'ed process has a different credential 1638145256Sjkoshy * than before, allow it to be the target of a PMC only if 1639145256Sjkoshy * the PMC's owner has sufficient priviledge. 1640145256Sjkoshy */ 1641145256Sjkoshy 1642145256Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1643145256Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1644145256Sjkoshy if (pmc_can_attach(pm, td->td_proc) != 0) 1645145256Sjkoshy pmc_detach_one_process(td->td_proc, 1646145256Sjkoshy pm, PMC_FLAG_NONE); 1647145256Sjkoshy 1648145256Sjkoshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1649145256Sjkoshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1650145256Sjkoshy pp->pp_refcnt, pp)); 1651145256Sjkoshy 1652145256Sjkoshy /* 1653145256Sjkoshy * If this process is no longer the target of any 1654145256Sjkoshy * PMCs, we can remove the process entry and free 1655145256Sjkoshy * up space. 1656145256Sjkoshy */ 1657145256Sjkoshy 1658145256Sjkoshy if (pp->pp_refcnt == 0) { 1659145256Sjkoshy pmc_remove_process_descriptor(pp); 1660145256Sjkoshy FREE(pp, M_PMC); 1661147191Sjkoshy break; 1662145256Sjkoshy } 1663145256Sjkoshy 1664145256Sjkoshy } 1665145256Sjkoshy break; 1666145256Sjkoshy 1667145256Sjkoshy case PMC_FN_CSW_IN: 1668147191Sjkoshy pmc_process_csw_in(td); 1669147191Sjkoshy break; 1670145256Sjkoshy 1671147191Sjkoshy case PMC_FN_CSW_OUT: 1672147191Sjkoshy pmc_process_csw_out(td); 1673147191Sjkoshy break; 1674145256Sjkoshy 1675145256Sjkoshy /* 1676147191Sjkoshy * Process accumulated PC samples. 1677147191Sjkoshy * 1678147191Sjkoshy * This function is expected to be called by hardclock() for 1679147191Sjkoshy * each CPU that has accumulated PC samples. 1680147191Sjkoshy * 1681147191Sjkoshy * This function is to be executed on the CPU whose samples 1682147191Sjkoshy * are being processed. 1683145256Sjkoshy */ 1684147191Sjkoshy case PMC_FN_DO_SAMPLES: 1685145256Sjkoshy 1686145256Sjkoshy /* 1687147191Sjkoshy * Clear the cpu specific bit in the CPU mask before 1688147191Sjkoshy * do the rest of the processing. If the NMI handler 1689147191Sjkoshy * gets invoked after the "atomic_clear_int()" call 1690147191Sjkoshy * below but before "pmc_process_samples()" gets 1691147191Sjkoshy * around to processing the interrupt, then we will 1692147191Sjkoshy * come back here at the next hardclock() tick (and 1693147191Sjkoshy * may find nothing to do if "pmc_process_samples()" 1694147191Sjkoshy * had already processed the interrupt). We don't 1695147191Sjkoshy * lose the interrupt sample. 1696145256Sjkoshy */ 1697147191Sjkoshy atomic_clear_int(&pmc_cpumask, (1 << PCPU_GET(cpuid))); 1698147191Sjkoshy pmc_process_samples(PCPU_GET(cpuid)); 1699147191Sjkoshy break; 1700145256Sjkoshy 1701157144Sjkoshy 1702157144Sjkoshy case PMC_FN_KLD_LOAD: 1703157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1704157144Sjkoshy pmc_process_kld_load((struct pmckern_map_in *) arg); 1705157144Sjkoshy break; 1706157144Sjkoshy 1707157144Sjkoshy case PMC_FN_KLD_UNLOAD: 1708157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1709157144Sjkoshy pmc_process_kld_unload((struct pmckern_map_out *) arg); 1710157144Sjkoshy break; 1711157144Sjkoshy 1712157144Sjkoshy case PMC_FN_MMAP: 1713157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1714157144Sjkoshy pmc_process_mmap(td, (struct pmckern_map_in *) arg); 1715157144Sjkoshy break; 1716157144Sjkoshy 1717157144Sjkoshy case PMC_FN_MUNMAP: 1718157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1719157144Sjkoshy pmc_process_munmap(td, (struct pmckern_map_out *) arg); 1720157144Sjkoshy break; 1721157144Sjkoshy 1722145256Sjkoshy default: 1723153110Sru#ifdef DEBUG 1724145256Sjkoshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 1725145256Sjkoshy#endif 1726145256Sjkoshy break; 1727145256Sjkoshy 1728145256Sjkoshy } 1729145256Sjkoshy 1730145256Sjkoshy return 0; 1731145256Sjkoshy} 1732145256Sjkoshy 1733145256Sjkoshy/* 1734145256Sjkoshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 1735145256Sjkoshy */ 1736145256Sjkoshy 1737145256Sjkoshystatic struct pmc_owner * 1738145256Sjkoshypmc_allocate_owner_descriptor(struct proc *p) 1739145256Sjkoshy{ 1740145256Sjkoshy uint32_t hindex; 1741145256Sjkoshy struct pmc_owner *po; 1742145256Sjkoshy struct pmc_ownerhash *poh; 1743145256Sjkoshy 1744145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1745145256Sjkoshy poh = &pmc_ownerhash[hindex]; 1746145256Sjkoshy 1747145256Sjkoshy /* allocate space for N pointers and one descriptor struct */ 1748145256Sjkoshy MALLOC(po, struct pmc_owner *, sizeof(struct pmc_owner), 1749147191Sjkoshy M_PMC, M_ZERO|M_WAITOK); 1750145256Sjkoshy 1751147191Sjkoshy po->po_sscount = po->po_error = po->po_flags = 0; 1752147191Sjkoshy po->po_file = NULL; 1753145256Sjkoshy po->po_owner = p; 1754147191Sjkoshy po->po_kthread = NULL; 1755145256Sjkoshy LIST_INIT(&po->po_pmcs); 1756145256Sjkoshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 1757145256Sjkoshy 1758147191Sjkoshy TAILQ_INIT(&po->po_logbuffers); 1759147191Sjkoshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc", MTX_SPIN); 1760147191Sjkoshy 1761145256Sjkoshy PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 1762145256Sjkoshy p, p->p_pid, p->p_comm, po); 1763145256Sjkoshy 1764145256Sjkoshy return po; 1765145256Sjkoshy} 1766145256Sjkoshy 1767147191Sjkoshystatic void 1768147191Sjkoshypmc_destroy_owner_descriptor(struct pmc_owner *po) 1769147191Sjkoshy{ 1770147191Sjkoshy 1771147191Sjkoshy PMCDBG(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 1772147191Sjkoshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 1773147191Sjkoshy 1774147191Sjkoshy mtx_destroy(&po->po_mtx); 1775147191Sjkoshy FREE(po, M_PMC); 1776147191Sjkoshy} 1777147191Sjkoshy 1778145256Sjkoshy/* 1779145256Sjkoshy * find the descriptor corresponding to process 'p', adding or removing it 1780145256Sjkoshy * as specified by 'mode'. 1781145256Sjkoshy */ 1782145256Sjkoshy 1783145256Sjkoshystatic struct pmc_process * 1784145256Sjkoshypmc_find_process_descriptor(struct proc *p, uint32_t mode) 1785145256Sjkoshy{ 1786145256Sjkoshy uint32_t hindex; 1787145256Sjkoshy struct pmc_process *pp, *ppnew; 1788145256Sjkoshy struct pmc_processhash *pph; 1789145256Sjkoshy 1790145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 1791145256Sjkoshy pph = &pmc_processhash[hindex]; 1792145256Sjkoshy 1793145256Sjkoshy ppnew = NULL; 1794145256Sjkoshy 1795145256Sjkoshy /* 1796145256Sjkoshy * Pre-allocate memory in the FIND_ALLOCATE case since we 1797145256Sjkoshy * cannot call malloc(9) once we hold a spin lock. 1798145256Sjkoshy */ 1799145256Sjkoshy 1800145256Sjkoshy if (mode & PMC_FLAG_ALLOCATE) { 1801145256Sjkoshy /* allocate additional space for 'n' pmc pointers */ 1802145256Sjkoshy MALLOC(ppnew, struct pmc_process *, 1803145256Sjkoshy sizeof(struct pmc_process) + md->pmd_npmc * 1804145256Sjkoshy sizeof(struct pmc_targetstate), M_PMC, M_ZERO|M_WAITOK); 1805145256Sjkoshy } 1806145256Sjkoshy 1807145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1808145256Sjkoshy LIST_FOREACH(pp, pph, pp_next) 1809145256Sjkoshy if (pp->pp_proc == p) 1810145256Sjkoshy break; 1811145256Sjkoshy 1812145256Sjkoshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 1813145256Sjkoshy LIST_REMOVE(pp, pp_next); 1814145256Sjkoshy 1815145256Sjkoshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 1816145256Sjkoshy ppnew != NULL) { 1817145256Sjkoshy ppnew->pp_proc = p; 1818145256Sjkoshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 1819145256Sjkoshy pp = ppnew; 1820145256Sjkoshy ppnew = NULL; 1821145256Sjkoshy } 1822145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1823145256Sjkoshy 1824145256Sjkoshy if (pp != NULL && ppnew != NULL) 1825145256Sjkoshy FREE(ppnew, M_PMC); 1826145256Sjkoshy 1827145256Sjkoshy return pp; 1828145256Sjkoshy} 1829145256Sjkoshy 1830145256Sjkoshy/* 1831145256Sjkoshy * remove a process descriptor from the process hash table. 1832145256Sjkoshy */ 1833145256Sjkoshy 1834145256Sjkoshystatic void 1835145256Sjkoshypmc_remove_process_descriptor(struct pmc_process *pp) 1836145256Sjkoshy{ 1837145256Sjkoshy KASSERT(pp->pp_refcnt == 0, 1838145256Sjkoshy ("[pmc,%d] Removing process descriptor %p with count %d", 1839145256Sjkoshy __LINE__, pp, pp->pp_refcnt)); 1840145256Sjkoshy 1841145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 1842145256Sjkoshy LIST_REMOVE(pp, pp_next); 1843145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 1844145256Sjkoshy} 1845145256Sjkoshy 1846145256Sjkoshy 1847145256Sjkoshy/* 1848145256Sjkoshy * find an owner descriptor corresponding to proc 'p' 1849145256Sjkoshy */ 1850145256Sjkoshy 1851145256Sjkoshystatic struct pmc_owner * 1852145256Sjkoshypmc_find_owner_descriptor(struct proc *p) 1853145256Sjkoshy{ 1854145256Sjkoshy uint32_t hindex; 1855145256Sjkoshy struct pmc_owner *po; 1856145256Sjkoshy struct pmc_ownerhash *poh; 1857145256Sjkoshy 1858145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1859145256Sjkoshy poh = &pmc_ownerhash[hindex]; 1860145256Sjkoshy 1861145256Sjkoshy po = NULL; 1862145256Sjkoshy LIST_FOREACH(po, poh, po_next) 1863145256Sjkoshy if (po->po_owner == p) 1864145256Sjkoshy break; 1865145256Sjkoshy 1866145256Sjkoshy PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 1867145256Sjkoshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 1868145256Sjkoshy 1869145256Sjkoshy return po; 1870145256Sjkoshy} 1871145256Sjkoshy 1872145256Sjkoshy/* 1873145256Sjkoshy * pmc_allocate_pmc_descriptor 1874145256Sjkoshy * 1875145256Sjkoshy * Allocate a pmc descriptor and initialize its 1876145256Sjkoshy * fields. 1877145256Sjkoshy */ 1878145256Sjkoshy 1879145256Sjkoshystatic struct pmc * 1880145256Sjkoshypmc_allocate_pmc_descriptor(void) 1881145256Sjkoshy{ 1882145256Sjkoshy struct pmc *pmc; 1883145256Sjkoshy 1884145256Sjkoshy MALLOC(pmc, struct pmc *, sizeof(struct pmc), M_PMC, M_ZERO|M_WAITOK); 1885145256Sjkoshy 1886145256Sjkoshy if (pmc != NULL) { 1887145256Sjkoshy pmc->pm_owner = NULL; 1888145256Sjkoshy LIST_INIT(&pmc->pm_targets); 1889145256Sjkoshy } 1890145256Sjkoshy 1891145256Sjkoshy PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 1892145256Sjkoshy 1893145256Sjkoshy return pmc; 1894145256Sjkoshy} 1895145256Sjkoshy 1896145256Sjkoshy/* 1897145256Sjkoshy * Destroy a pmc descriptor. 1898145256Sjkoshy */ 1899145256Sjkoshy 1900145256Sjkoshystatic void 1901145256Sjkoshypmc_destroy_pmc_descriptor(struct pmc *pm) 1902145256Sjkoshy{ 1903145256Sjkoshy (void) pm; 1904145256Sjkoshy 1905153110Sru#ifdef DEBUG 1906145256Sjkoshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 1907145256Sjkoshy pm->pm_state == PMC_STATE_FREE, 1908145256Sjkoshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 1909145256Sjkoshy KASSERT(LIST_EMPTY(&pm->pm_targets), 1910145256Sjkoshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 1911145256Sjkoshy KASSERT(pm->pm_owner == NULL, 1912145256Sjkoshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 1913145256Sjkoshy KASSERT(pm->pm_runcount == 0, 1914145256Sjkoshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 1915145256Sjkoshy pm->pm_runcount)); 1916145256Sjkoshy#endif 1917145256Sjkoshy} 1918145256Sjkoshy 1919147191Sjkoshystatic void 1920147191Sjkoshypmc_wait_for_pmc_idle(struct pmc *pm) 1921147191Sjkoshy{ 1922153110Sru#ifdef DEBUG 1923147191Sjkoshy volatile int maxloop; 1924147191Sjkoshy 1925147191Sjkoshy maxloop = 100 * mp_ncpus; 1926147191Sjkoshy#endif 1927147191Sjkoshy 1928147191Sjkoshy /* 1929147191Sjkoshy * Loop (with a forced context switch) till the PMC's runcount 1930147191Sjkoshy * comes down to zero. 1931147191Sjkoshy */ 1932147191Sjkoshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 1933153110Sru#ifdef DEBUG 1934147191Sjkoshy maxloop--; 1935147191Sjkoshy KASSERT(maxloop > 0, 1936147191Sjkoshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 1937147191Sjkoshy "pmc to be free", __LINE__, 1938147191Sjkoshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 1939147191Sjkoshy#endif 1940147191Sjkoshy pmc_force_context_switch(); 1941147191Sjkoshy } 1942147191Sjkoshy} 1943147191Sjkoshy 1944145256Sjkoshy/* 1945145256Sjkoshy * This function does the following things: 1946145256Sjkoshy * 1947145256Sjkoshy * - detaches the PMC from hardware 1948145256Sjkoshy * - unlinks all target threads that were attached to it 1949145256Sjkoshy * - removes the PMC from its owner's list 1950145256Sjkoshy * - destroy's the PMC private mutex 1951145256Sjkoshy * 1952145256Sjkoshy * Once this function completes, the given pmc pointer can be safely 1953145256Sjkoshy * FREE'd by the caller. 1954145256Sjkoshy */ 1955145256Sjkoshy 1956145256Sjkoshystatic void 1957145256Sjkoshypmc_release_pmc_descriptor(struct pmc *pm) 1958145256Sjkoshy{ 1959145256Sjkoshy u_int ri, cpu; 1960145774Sjkoshy enum pmc_mode mode; 1961145256Sjkoshy struct pmc_hw *phw; 1962147191Sjkoshy struct pmc_owner *po; 1963145256Sjkoshy struct pmc_process *pp; 1964145256Sjkoshy struct pmc_target *ptgt, *tmp; 1965145256Sjkoshy struct pmc_binding pb; 1966145256Sjkoshy 1967145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1968145256Sjkoshy 1969145256Sjkoshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 1970145256Sjkoshy 1971145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1972145774Sjkoshy mode = PMC_TO_MODE(pm); 1973145256Sjkoshy 1974145256Sjkoshy PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 1975145774Sjkoshy mode); 1976145256Sjkoshy 1977145256Sjkoshy /* 1978145256Sjkoshy * First, we take the PMC off hardware. 1979145256Sjkoshy */ 1980145301Simp cpu = 0; 1981145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 1982145256Sjkoshy 1983145256Sjkoshy /* 1984145256Sjkoshy * A system mode PMC runs on a specific CPU. Switch 1985145256Sjkoshy * to this CPU and turn hardware off. 1986145256Sjkoshy */ 1987145256Sjkoshy pmc_save_cpu_binding(&pb); 1988145256Sjkoshy 1989145774Sjkoshy cpu = PMC_TO_CPU(pm); 1990145256Sjkoshy 1991147191Sjkoshy pmc_select_cpu(cpu); 1992145256Sjkoshy 1993147191Sjkoshy /* switch off non-stalled CPUs */ 1994147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 1995147867Sjkoshy pm->pm_stalled == 0) { 1996145256Sjkoshy 1997145256Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 1998145256Sjkoshy 1999145256Sjkoshy KASSERT(phw->phw_pmc == pm, 2000145256Sjkoshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 2001145256Sjkoshy __LINE__, ri, phw->phw_pmc, pm)); 2002145256Sjkoshy PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 2003145256Sjkoshy 2004145256Sjkoshy critical_enter(); 2005145256Sjkoshy md->pmd_stop_pmc(cpu, ri); 2006145256Sjkoshy critical_exit(); 2007145256Sjkoshy } 2008145256Sjkoshy 2009145256Sjkoshy PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 2010145256Sjkoshy 2011145256Sjkoshy critical_enter(); 2012145256Sjkoshy md->pmd_config_pmc(cpu, ri, NULL); 2013145256Sjkoshy critical_exit(); 2014145256Sjkoshy 2015147191Sjkoshy /* adjust the global and process count of SS mode PMCs */ 2016147191Sjkoshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 2017147191Sjkoshy po = pm->pm_owner; 2018147191Sjkoshy po->po_sscount--; 2019147191Sjkoshy if (po->po_sscount == 0) { 2020147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2021147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2022147191Sjkoshy } 2023147191Sjkoshy } 2024147191Sjkoshy 2025145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2026145256Sjkoshy 2027145256Sjkoshy pmc_restore_cpu_binding(&pb); 2028145256Sjkoshy 2029147191Sjkoshy /* 2030147191Sjkoshy * We could have references to this PMC structure in 2031147191Sjkoshy * the per-cpu sample queues. Wait for the queue to 2032147191Sjkoshy * drain. 2033147191Sjkoshy */ 2034147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2035147191Sjkoshy 2036145774Sjkoshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 2037145256Sjkoshy 2038145256Sjkoshy /* 2039145256Sjkoshy * A virtual PMC could be running on multiple CPUs at 2040145256Sjkoshy * a given instant. 2041145256Sjkoshy * 2042145256Sjkoshy * By marking its state as DELETED, we ensure that 2043145256Sjkoshy * this PMC is never further scheduled on hardware. 2044145256Sjkoshy * 2045145256Sjkoshy * Then we wait till all CPUs are done with this PMC. 2046145256Sjkoshy */ 2047145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2048145256Sjkoshy 2049145256Sjkoshy 2050147191Sjkoshy /* Wait for the PMCs runcount to come to zero. */ 2051147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2052145256Sjkoshy 2053145256Sjkoshy /* 2054145256Sjkoshy * At this point the PMC is off all CPUs and cannot be 2055145256Sjkoshy * freshly scheduled onto a CPU. It is now safe to 2056145256Sjkoshy * unlink all targets from this PMC. If a 2057145256Sjkoshy * process-record's refcount falls to zero, we remove 2058145256Sjkoshy * it from the hash table. The module-wide SX lock 2059145256Sjkoshy * protects us from races. 2060145256Sjkoshy */ 2061145256Sjkoshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 2062145256Sjkoshy pp = ptgt->pt_process; 2063145256Sjkoshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 2064145256Sjkoshy 2065145256Sjkoshy PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 2066145256Sjkoshy 2067145256Sjkoshy /* 2068145256Sjkoshy * If the target process record shows that no 2069145256Sjkoshy * PMCs are attached to it, reclaim its space. 2070145256Sjkoshy */ 2071145256Sjkoshy 2072145256Sjkoshy if (pp->pp_refcnt == 0) { 2073145256Sjkoshy pmc_remove_process_descriptor(pp); 2074145256Sjkoshy FREE(pp, M_PMC); 2075145256Sjkoshy } 2076145256Sjkoshy } 2077145256Sjkoshy 2078145256Sjkoshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 2079145256Sjkoshy 2080145256Sjkoshy } 2081145256Sjkoshy 2082145256Sjkoshy /* 2083145256Sjkoshy * Release any MD resources 2084145256Sjkoshy */ 2085145256Sjkoshy 2086145256Sjkoshy (void) md->pmd_release_pmc(cpu, ri, pm); 2087145256Sjkoshy 2088145256Sjkoshy /* 2089145256Sjkoshy * Update row disposition 2090145256Sjkoshy */ 2091145256Sjkoshy 2092145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 2093145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2094145256Sjkoshy else 2095145256Sjkoshy PMC_UNMARK_ROW_THREAD(ri); 2096145256Sjkoshy 2097145256Sjkoshy /* unlink from the owner's list */ 2098147191Sjkoshy if (pm->pm_owner) { 2099147191Sjkoshy LIST_REMOVE(pm, pm_next); 2100147191Sjkoshy pm->pm_owner = NULL; 2101147191Sjkoshy } 2102145256Sjkoshy 2103145256Sjkoshy pmc_destroy_pmc_descriptor(pm); 2104145256Sjkoshy} 2105145256Sjkoshy 2106145256Sjkoshy/* 2107145256Sjkoshy * Register an owner and a pmc. 2108145256Sjkoshy */ 2109145256Sjkoshy 2110145256Sjkoshystatic int 2111145256Sjkoshypmc_register_owner(struct proc *p, struct pmc *pmc) 2112145256Sjkoshy{ 2113145256Sjkoshy struct pmc_owner *po; 2114145256Sjkoshy 2115145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2116145256Sjkoshy 2117145774Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2118147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 2119145256Sjkoshy return ENOMEM; 2120145256Sjkoshy 2121145256Sjkoshy KASSERT(pmc->pm_owner == NULL, 2122145256Sjkoshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 2123145256Sjkoshy pmc->pm_owner = po; 2124145256Sjkoshy 2125147191Sjkoshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 2126145256Sjkoshy 2127145256Sjkoshy PROC_LOCK(p); 2128145256Sjkoshy p->p_flag |= P_HWPMC; 2129145256Sjkoshy PROC_UNLOCK(p); 2130145256Sjkoshy 2131147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 2132147191Sjkoshy pmclog_process_pmcallocate(pmc); 2133145256Sjkoshy 2134147191Sjkoshy PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2135147191Sjkoshy po, pmc); 2136147191Sjkoshy 2137145256Sjkoshy return 0; 2138145256Sjkoshy} 2139145256Sjkoshy 2140145256Sjkoshy/* 2141145256Sjkoshy * Return the current row disposition: 2142145256Sjkoshy * == 0 => FREE 2143145256Sjkoshy * > 0 => PROCESS MODE 2144145256Sjkoshy * < 0 => SYSTEM MODE 2145145256Sjkoshy */ 2146145256Sjkoshy 2147145256Sjkoshyint 2148145256Sjkoshypmc_getrowdisp(int ri) 2149145256Sjkoshy{ 2150145256Sjkoshy return pmc_pmcdisp[ri]; 2151145256Sjkoshy} 2152145256Sjkoshy 2153145256Sjkoshy/* 2154145256Sjkoshy * Check if a PMC at row index 'ri' can be allocated to the current 2155145256Sjkoshy * process. 2156145256Sjkoshy * 2157145256Sjkoshy * Allocation can fail if: 2158145256Sjkoshy * - the current process is already being profiled by a PMC at index 'ri', 2159145256Sjkoshy * attached to it via OP_PMCATTACH. 2160145256Sjkoshy * - the current process has already allocated a PMC at index 'ri' 2161145256Sjkoshy * via OP_ALLOCATE. 2162145256Sjkoshy */ 2163145256Sjkoshy 2164145256Sjkoshystatic int 2165145774Sjkoshypmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2166145256Sjkoshy{ 2167145774Sjkoshy enum pmc_mode mode; 2168145774Sjkoshy struct pmc *pm; 2169145256Sjkoshy struct pmc_owner *po; 2170145256Sjkoshy struct pmc_process *pp; 2171145256Sjkoshy 2172145774Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2173145774Sjkoshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2174145256Sjkoshy 2175145774Sjkoshy /* 2176145774Sjkoshy * We shouldn't have already allocated a process-mode PMC at 2177145774Sjkoshy * row index 'ri'. 2178145774Sjkoshy * 2179145774Sjkoshy * We shouldn't have allocated a system-wide PMC on the same 2180145774Sjkoshy * CPU and same RI. 2181145774Sjkoshy */ 2182145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2183147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2184145774Sjkoshy if (PMC_TO_ROWINDEX(pm) == ri) { 2185145774Sjkoshy mode = PMC_TO_MODE(pm); 2186145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) 2187145774Sjkoshy return EEXIST; 2188145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && 2189145774Sjkoshy (int) PMC_TO_CPU(pm) == cpu) 2190145774Sjkoshy return EEXIST; 2191145774Sjkoshy } 2192145774Sjkoshy } 2193145256Sjkoshy 2194145774Sjkoshy /* 2195145774Sjkoshy * We also shouldn't be the target of any PMC at this index 2196145774Sjkoshy * since otherwise a PMC_ATTACH to ourselves will fail. 2197145774Sjkoshy */ 2198145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2199145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc) 2200145256Sjkoshy return EEXIST; 2201145256Sjkoshy 2202145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2203145256Sjkoshy p, p->p_pid, p->p_comm, ri); 2204145256Sjkoshy 2205145256Sjkoshy return 0; 2206145256Sjkoshy} 2207145256Sjkoshy 2208145256Sjkoshy/* 2209145256Sjkoshy * Check if a given PMC at row index 'ri' can be currently used in 2210145256Sjkoshy * mode 'mode'. 2211145256Sjkoshy */ 2212145256Sjkoshy 2213145256Sjkoshystatic int 2214145256Sjkoshypmc_can_allocate_row(int ri, enum pmc_mode mode) 2215145256Sjkoshy{ 2216145256Sjkoshy enum pmc_disp disp; 2217145256Sjkoshy 2218145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2219145256Sjkoshy 2220145256Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2221145256Sjkoshy 2222145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2223145256Sjkoshy disp = PMC_DISP_STANDALONE; 2224145256Sjkoshy else 2225145256Sjkoshy disp = PMC_DISP_THREAD; 2226145256Sjkoshy 2227145256Sjkoshy /* 2228145256Sjkoshy * check disposition for PMC row 'ri': 2229145256Sjkoshy * 2230145256Sjkoshy * Expected disposition Row-disposition Result 2231145256Sjkoshy * 2232145256Sjkoshy * STANDALONE STANDALONE or FREE proceed 2233145256Sjkoshy * STANDALONE THREAD fail 2234145256Sjkoshy * THREAD THREAD or FREE proceed 2235145256Sjkoshy * THREAD STANDALONE fail 2236145256Sjkoshy */ 2237145256Sjkoshy 2238145256Sjkoshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2239145256Sjkoshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2240145256Sjkoshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2241145256Sjkoshy return EBUSY; 2242145256Sjkoshy 2243145256Sjkoshy /* 2244145256Sjkoshy * All OK 2245145256Sjkoshy */ 2246145256Sjkoshy 2247145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2248145256Sjkoshy 2249145256Sjkoshy return 0; 2250145256Sjkoshy 2251145256Sjkoshy} 2252145256Sjkoshy 2253145256Sjkoshy/* 2254145774Sjkoshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2255145256Sjkoshy */ 2256145256Sjkoshy 2257145256Sjkoshystatic struct pmc * 2258145256Sjkoshypmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2259145256Sjkoshy{ 2260147191Sjkoshy struct pmc *pm; 2261145256Sjkoshy 2262145774Sjkoshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2263145774Sjkoshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2264145774Sjkoshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2265145256Sjkoshy 2266147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2267147191Sjkoshy if (pm->pm_id == pmcid) 2268147191Sjkoshy return pm; 2269145256Sjkoshy 2270145256Sjkoshy return NULL; 2271145256Sjkoshy} 2272145256Sjkoshy 2273145256Sjkoshystatic int 2274145256Sjkoshypmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2275145256Sjkoshy{ 2276145256Sjkoshy 2277145256Sjkoshy struct pmc *pm; 2278145256Sjkoshy struct pmc_owner *po; 2279145256Sjkoshy 2280145256Sjkoshy PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid); 2281145256Sjkoshy 2282145256Sjkoshy if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) 2283145256Sjkoshy return ESRCH; 2284145256Sjkoshy 2285145256Sjkoshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2286145256Sjkoshy return EINVAL; 2287145256Sjkoshy 2288145256Sjkoshy PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2289145256Sjkoshy 2290145256Sjkoshy *pmc = pm; 2291145256Sjkoshy return 0; 2292145256Sjkoshy} 2293145256Sjkoshy 2294145256Sjkoshy/* 2295145256Sjkoshy * Start a PMC. 2296145256Sjkoshy */ 2297145256Sjkoshy 2298145256Sjkoshystatic int 2299145256Sjkoshypmc_start(struct pmc *pm) 2300145256Sjkoshy{ 2301145256Sjkoshy int error, cpu, ri; 2302145774Sjkoshy enum pmc_mode mode; 2303147191Sjkoshy struct pmc_owner *po; 2304145256Sjkoshy struct pmc_binding pb; 2305145256Sjkoshy 2306145256Sjkoshy KASSERT(pm != NULL, 2307145256Sjkoshy ("[pmc,%d] null pm", __LINE__)); 2308145256Sjkoshy 2309145774Sjkoshy mode = PMC_TO_MODE(pm); 2310145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2311145774Sjkoshy error = 0; 2312145256Sjkoshy 2313145774Sjkoshy PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2314145774Sjkoshy 2315147191Sjkoshy po = pm->pm_owner; 2316145256Sjkoshy 2317145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2318145256Sjkoshy 2319145256Sjkoshy /* 2320147191Sjkoshy * If a PMCATTACH has never been done on this PMC, 2321147191Sjkoshy * attach it to its owner process. 2322145256Sjkoshy */ 2323145256Sjkoshy 2324145256Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 2325147191Sjkoshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2326147191Sjkoshy pmc_attach_process(po->po_owner, pm); 2327145256Sjkoshy 2328145774Sjkoshy /* 2329147191Sjkoshy * Disallow PMCSTART if a logfile is required but has not 2330147191Sjkoshy * been configured yet. 2331145774Sjkoshy */ 2332145256Sjkoshy 2333147191Sjkoshy if (error == 0 && (pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2334147191Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2335147191Sjkoshy error = EDOOFUS; 2336147191Sjkoshy 2337145256Sjkoshy /* 2338147191Sjkoshy * If the PMC is attached to its owner, then force a context 2339147191Sjkoshy * switch to ensure that the MD state gets set correctly. 2340145256Sjkoshy */ 2341145256Sjkoshy 2342147191Sjkoshy if (error == 0) { 2343147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2344147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2345147191Sjkoshy pmc_force_context_switch(); 2346147191Sjkoshy } 2347147191Sjkoshy 2348145774Sjkoshy return error; 2349147191Sjkoshy } 2350145256Sjkoshy 2351147191Sjkoshy 2352147191Sjkoshy /* 2353147191Sjkoshy * A system-wide PMC. 2354147191Sjkoshy */ 2355147191Sjkoshy 2356147191Sjkoshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2357147191Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2358147191Sjkoshy return EDOOFUS; /* programming error */ 2359147191Sjkoshy 2360147191Sjkoshy /* 2361147191Sjkoshy * Add the owner to the global list if this is a system-wide 2362147191Sjkoshy * sampling PMC. 2363147191Sjkoshy */ 2364147191Sjkoshy 2365147191Sjkoshy if (mode == PMC_MODE_SS) { 2366147191Sjkoshy if (po->po_sscount == 0) { 2367147191Sjkoshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2368147191Sjkoshy atomic_add_rel_int(&pmc_ss_count, 1); 2369147191Sjkoshy PMCDBG(PMC,OPS,1, "po=%p in global list", po); 2370147191Sjkoshy } 2371147191Sjkoshy po->po_sscount++; 2372145256Sjkoshy } 2373145256Sjkoshy 2374157144Sjkoshy /* TODO: dump system wide process mappings to the log? */ 2375157144Sjkoshy 2376145256Sjkoshy /* 2377147191Sjkoshy * Move to the CPU associated with this 2378145256Sjkoshy * PMC, and start the hardware. 2379145256Sjkoshy */ 2380145256Sjkoshy 2381145256Sjkoshy pmc_save_cpu_binding(&pb); 2382145256Sjkoshy 2383145774Sjkoshy cpu = PMC_TO_CPU(pm); 2384145256Sjkoshy 2385145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 2386145256Sjkoshy return ENXIO; 2387145256Sjkoshy 2388145256Sjkoshy pmc_select_cpu(cpu); 2389145256Sjkoshy 2390145256Sjkoshy /* 2391145256Sjkoshy * global PMCs are configured at allocation time 2392145256Sjkoshy * so write out the initial value and start the PMC. 2393145256Sjkoshy */ 2394145256Sjkoshy 2395147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2396147191Sjkoshy 2397145774Sjkoshy critical_enter(); 2398145256Sjkoshy if ((error = md->pmd_write_pmc(cpu, ri, 2399145774Sjkoshy PMC_IS_SAMPLING_MODE(mode) ? 2400145256Sjkoshy pm->pm_sc.pm_reloadcount : 2401145256Sjkoshy pm->pm_sc.pm_initial)) == 0) 2402145256Sjkoshy error = md->pmd_start_pmc(cpu, ri); 2403145774Sjkoshy critical_exit(); 2404145256Sjkoshy 2405145256Sjkoshy pmc_restore_cpu_binding(&pb); 2406145256Sjkoshy 2407145256Sjkoshy return error; 2408145256Sjkoshy} 2409145256Sjkoshy 2410145256Sjkoshy/* 2411145256Sjkoshy * Stop a PMC. 2412145256Sjkoshy */ 2413145256Sjkoshy 2414145256Sjkoshystatic int 2415145256Sjkoshypmc_stop(struct pmc *pm) 2416145256Sjkoshy{ 2417145774Sjkoshy int cpu, error, ri; 2418147191Sjkoshy struct pmc_owner *po; 2419145256Sjkoshy struct pmc_binding pb; 2420145256Sjkoshy 2421145256Sjkoshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2422145256Sjkoshy 2423145774Sjkoshy PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2424145774Sjkoshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2425145256Sjkoshy 2426145256Sjkoshy pm->pm_state = PMC_STATE_STOPPED; 2427145256Sjkoshy 2428145256Sjkoshy /* 2429145256Sjkoshy * If the PMC is a virtual mode one, changing the state to 2430145256Sjkoshy * non-RUNNING is enough to ensure that the PMC never gets 2431145256Sjkoshy * scheduled. 2432145256Sjkoshy * 2433145256Sjkoshy * If this PMC is current running on a CPU, then it will 2434145256Sjkoshy * handled correctly at the time its target process is context 2435145256Sjkoshy * switched out. 2436145256Sjkoshy */ 2437145256Sjkoshy 2438145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2439145256Sjkoshy return 0; 2440145256Sjkoshy 2441145256Sjkoshy /* 2442145256Sjkoshy * A system-mode PMC. Move to the CPU associated with 2443145256Sjkoshy * this PMC, and stop the hardware. We update the 2444145256Sjkoshy * 'initial count' so that a subsequent PMCSTART will 2445145256Sjkoshy * resume counting from the current hardware count. 2446145256Sjkoshy */ 2447145256Sjkoshy 2448145256Sjkoshy pmc_save_cpu_binding(&pb); 2449145256Sjkoshy 2450145774Sjkoshy cpu = PMC_TO_CPU(pm); 2451145256Sjkoshy 2452145774Sjkoshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 2453145774Sjkoshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2454145774Sjkoshy 2455145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 2456145256Sjkoshy return ENXIO; 2457145256Sjkoshy 2458145256Sjkoshy pmc_select_cpu(cpu); 2459145256Sjkoshy 2460145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2461145256Sjkoshy 2462145774Sjkoshy critical_enter(); 2463145774Sjkoshy if ((error = md->pmd_stop_pmc(cpu, ri)) == 0) 2464145774Sjkoshy error = md->pmd_read_pmc(cpu, ri, &pm->pm_sc.pm_initial); 2465145774Sjkoshy critical_exit(); 2466145774Sjkoshy 2467145256Sjkoshy pmc_restore_cpu_binding(&pb); 2468145256Sjkoshy 2469147191Sjkoshy po = pm->pm_owner; 2470147191Sjkoshy 2471147191Sjkoshy /* remove this owner from the global list of SS PMC owners */ 2472147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2473147191Sjkoshy po->po_sscount--; 2474147191Sjkoshy if (po->po_sscount == 0) { 2475147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2476147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2477147191Sjkoshy PMCDBG(PMC,OPS,2,"po=%p removed from global list", po); 2478147191Sjkoshy } 2479147191Sjkoshy } 2480147191Sjkoshy 2481145256Sjkoshy return error; 2482145256Sjkoshy} 2483145256Sjkoshy 2484145256Sjkoshy 2485153110Sru#ifdef DEBUG 2486145256Sjkoshystatic const char *pmc_op_to_name[] = { 2487145256Sjkoshy#undef __PMC_OP 2488145256Sjkoshy#define __PMC_OP(N, D) #N , 2489145256Sjkoshy __PMC_OPS() 2490145256Sjkoshy NULL 2491145256Sjkoshy}; 2492145256Sjkoshy#endif 2493145256Sjkoshy 2494145256Sjkoshy/* 2495145256Sjkoshy * The syscall interface 2496145256Sjkoshy */ 2497145256Sjkoshy 2498145256Sjkoshy#define PMC_GET_SX_XLOCK(...) do { \ 2499145256Sjkoshy sx_xlock(&pmc_sx); \ 2500145256Sjkoshy if (pmc_hook == NULL) { \ 2501145256Sjkoshy sx_xunlock(&pmc_sx); \ 2502145256Sjkoshy return __VA_ARGS__; \ 2503145256Sjkoshy } \ 2504145256Sjkoshy} while (0) 2505145256Sjkoshy 2506145256Sjkoshy#define PMC_DOWNGRADE_SX() do { \ 2507145256Sjkoshy sx_downgrade(&pmc_sx); \ 2508145256Sjkoshy is_sx_downgraded = 1; \ 2509145256Sjkoshy} while (0) 2510145256Sjkoshy 2511145256Sjkoshystatic int 2512145256Sjkoshypmc_syscall_handler(struct thread *td, void *syscall_args) 2513145256Sjkoshy{ 2514145256Sjkoshy int error, is_sx_downgraded, op; 2515145256Sjkoshy struct pmc_syscall_args *c; 2516145256Sjkoshy void *arg; 2517145256Sjkoshy 2518145256Sjkoshy PMC_GET_SX_XLOCK(ENOSYS); 2519145256Sjkoshy 2520147191Sjkoshy DROP_GIANT(); 2521147191Sjkoshy 2522145256Sjkoshy is_sx_downgraded = 0; 2523145256Sjkoshy 2524145256Sjkoshy c = (struct pmc_syscall_args *) syscall_args; 2525145256Sjkoshy 2526145256Sjkoshy op = c->pmop_code; 2527145256Sjkoshy arg = c->pmop_data; 2528145256Sjkoshy 2529145256Sjkoshy PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2530145256Sjkoshy pmc_op_to_name[op], arg); 2531145256Sjkoshy 2532145256Sjkoshy error = 0; 2533145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2534145256Sjkoshy 2535145256Sjkoshy switch(op) 2536145256Sjkoshy { 2537145256Sjkoshy 2538145256Sjkoshy 2539145256Sjkoshy /* 2540145256Sjkoshy * Configure a log file. 2541145256Sjkoshy * 2542145256Sjkoshy * XXX This OP will be reworked. 2543145256Sjkoshy */ 2544145256Sjkoshy 2545145256Sjkoshy case PMC_OP_CONFIGURELOG: 2546145256Sjkoshy { 2547157144Sjkoshy struct proc *p; 2548156466Sjkoshy struct pmc *pm; 2549145256Sjkoshy struct pmc_owner *po; 2550157144Sjkoshy struct pmckern_map_in *km, *kmbase; 2551145256Sjkoshy struct pmc_op_configurelog cl; 2552145256Sjkoshy 2553145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2554145256Sjkoshy 2555145256Sjkoshy if ((error = copyin(arg, &cl, sizeof(cl))) != 0) 2556145256Sjkoshy break; 2557145256Sjkoshy 2558145256Sjkoshy /* mark this process as owning a log file */ 2559145256Sjkoshy p = td->td_proc; 2560145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2561147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2562147191Sjkoshy error = ENOMEM; 2563147191Sjkoshy break; 2564147191Sjkoshy } 2565145256Sjkoshy 2566147191Sjkoshy /* 2567147191Sjkoshy * If a valid fd was passed in, try to configure that, 2568147191Sjkoshy * otherwise if 'fd' was less than zero and there was 2569147191Sjkoshy * a log file configured, flush its buffers and 2570147191Sjkoshy * de-configure it. 2571147191Sjkoshy */ 2572147191Sjkoshy if (cl.pm_logfd >= 0) 2573147191Sjkoshy error = pmclog_configure_log(po, cl.pm_logfd); 2574147191Sjkoshy else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2575147191Sjkoshy pmclog_process_closelog(po); 2576147191Sjkoshy error = pmclog_flush(po); 2577156466Sjkoshy if (error == 0) { 2578156466Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2579156834Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 2580156834Sjkoshy pm->pm_state == PMC_STATE_RUNNING) 2581156466Sjkoshy pmc_stop(pm); 2582147191Sjkoshy error = pmclog_deconfigure_log(po); 2583156466Sjkoshy } 2584147191Sjkoshy } else 2585147191Sjkoshy error = EINVAL; 2586157144Sjkoshy 2587157144Sjkoshy if (error) 2588157144Sjkoshy break; 2589157144Sjkoshy 2590157144Sjkoshy /* 2591157144Sjkoshy * Log the current set of kernel modules. 2592157144Sjkoshy */ 2593157144Sjkoshy kmbase = linker_hwpmc_list_objects(); 2594157144Sjkoshy for (km = kmbase; km->pm_file != NULL; km++) { 2595157144Sjkoshy PMCDBG(LOG,REG,1,"%s %p", (char *) km->pm_file, 2596157144Sjkoshy (void *) km->pm_address); 2597157144Sjkoshy pmclog_process_map_in(po, (pid_t) -1, km->pm_address, 2598157144Sjkoshy km->pm_file); 2599157144Sjkoshy } 2600157144Sjkoshy FREE(kmbase, M_LINKER); 2601147191Sjkoshy } 2602147191Sjkoshy break; 2603147191Sjkoshy 2604147191Sjkoshy 2605147191Sjkoshy /* 2606147191Sjkoshy * Flush a log file. 2607147191Sjkoshy */ 2608147191Sjkoshy 2609147191Sjkoshy case PMC_OP_FLUSHLOG: 2610147191Sjkoshy { 2611147191Sjkoshy struct pmc_owner *po; 2612147191Sjkoshy 2613147191Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2614147191Sjkoshy 2615147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2616147191Sjkoshy error = EINVAL; 2617145256Sjkoshy break; 2618147191Sjkoshy } 2619145256Sjkoshy 2620147191Sjkoshy error = pmclog_flush(po); 2621145256Sjkoshy } 2622145256Sjkoshy break; 2623145256Sjkoshy 2624145256Sjkoshy /* 2625145256Sjkoshy * Retrieve hardware configuration. 2626145256Sjkoshy */ 2627145256Sjkoshy 2628145256Sjkoshy case PMC_OP_GETCPUINFO: /* CPU information */ 2629145256Sjkoshy { 2630145256Sjkoshy struct pmc_op_getcpuinfo gci; 2631145256Sjkoshy 2632145256Sjkoshy gci.pm_cputype = md->pmd_cputype; 2633145774Sjkoshy gci.pm_ncpu = mp_ncpus; 2634145256Sjkoshy gci.pm_npmc = md->pmd_npmc; 2635145256Sjkoshy gci.pm_nclass = md->pmd_nclass; 2636145256Sjkoshy bcopy(md->pmd_classes, &gci.pm_classes, 2637145256Sjkoshy sizeof(gci.pm_classes)); 2638145256Sjkoshy error = copyout(&gci, arg, sizeof(gci)); 2639145256Sjkoshy } 2640145256Sjkoshy break; 2641145256Sjkoshy 2642145256Sjkoshy 2643145256Sjkoshy /* 2644145256Sjkoshy * Get module statistics 2645145256Sjkoshy */ 2646145256Sjkoshy 2647145256Sjkoshy case PMC_OP_GETDRIVERSTATS: 2648145256Sjkoshy { 2649145256Sjkoshy struct pmc_op_getdriverstats gms; 2650145256Sjkoshy 2651145256Sjkoshy bcopy(&pmc_stats, &gms, sizeof(gms)); 2652145256Sjkoshy error = copyout(&gms, arg, sizeof(gms)); 2653145256Sjkoshy } 2654145256Sjkoshy break; 2655145256Sjkoshy 2656145256Sjkoshy 2657145256Sjkoshy /* 2658145256Sjkoshy * Retrieve module version number 2659145256Sjkoshy */ 2660145256Sjkoshy 2661145256Sjkoshy case PMC_OP_GETMODULEVERSION: 2662145256Sjkoshy { 2663147191Sjkoshy uint32_t cv, modv; 2664147191Sjkoshy 2665147191Sjkoshy /* retrieve the client's idea of the ABI version */ 2666147191Sjkoshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 2667147191Sjkoshy break; 2668147191Sjkoshy /* don't service clients newer than our driver */ 2669147191Sjkoshy modv = PMC_VERSION; 2670147191Sjkoshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 2671147191Sjkoshy error = EPROGMISMATCH; 2672147191Sjkoshy break; 2673147191Sjkoshy } 2674147191Sjkoshy error = copyout(&modv, arg, sizeof(int)); 2675145256Sjkoshy } 2676145256Sjkoshy break; 2677145256Sjkoshy 2678145256Sjkoshy 2679145256Sjkoshy /* 2680145256Sjkoshy * Retrieve the state of all the PMCs on a given 2681145256Sjkoshy * CPU. 2682145256Sjkoshy */ 2683145256Sjkoshy 2684145256Sjkoshy case PMC_OP_GETPMCINFO: 2685145256Sjkoshy { 2686145256Sjkoshy uint32_t cpu, n, npmc; 2687145256Sjkoshy size_t pmcinfo_size; 2688145256Sjkoshy struct pmc *pm; 2689145256Sjkoshy struct pmc_info *p, *pmcinfo; 2690145256Sjkoshy struct pmc_op_getpmcinfo *gpi; 2691145256Sjkoshy struct pmc_owner *po; 2692145256Sjkoshy struct pmc_binding pb; 2693145256Sjkoshy 2694145256Sjkoshy PMC_DOWNGRADE_SX(); 2695145256Sjkoshy 2696145256Sjkoshy gpi = (struct pmc_op_getpmcinfo *) arg; 2697145256Sjkoshy 2698145256Sjkoshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 2699145256Sjkoshy break; 2700145256Sjkoshy 2701145256Sjkoshy if (cpu >= (unsigned int) mp_ncpus) { 2702145256Sjkoshy error = EINVAL; 2703145256Sjkoshy break; 2704145256Sjkoshy } 2705145256Sjkoshy 2706145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 2707145256Sjkoshy error = ENXIO; 2708145256Sjkoshy break; 2709145256Sjkoshy } 2710145256Sjkoshy 2711145256Sjkoshy /* switch to CPU 'cpu' */ 2712145256Sjkoshy pmc_save_cpu_binding(&pb); 2713145256Sjkoshy pmc_select_cpu(cpu); 2714145256Sjkoshy 2715145256Sjkoshy npmc = md->pmd_npmc; 2716145256Sjkoshy 2717145256Sjkoshy pmcinfo_size = npmc * sizeof(struct pmc_info); 2718145256Sjkoshy MALLOC(pmcinfo, struct pmc_info *, pmcinfo_size, M_PMC, 2719145256Sjkoshy M_WAITOK); 2720145256Sjkoshy 2721145256Sjkoshy p = pmcinfo; 2722145256Sjkoshy 2723145256Sjkoshy for (n = 0; n < md->pmd_npmc; n++, p++) { 2724145256Sjkoshy 2725145256Sjkoshy if ((error = md->pmd_describe(cpu, n, p, &pm)) != 0) 2726145256Sjkoshy break; 2727145256Sjkoshy 2728145256Sjkoshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 2729145256Sjkoshy p->pm_rowdisp = PMC_DISP_STANDALONE; 2730145256Sjkoshy else if (PMC_ROW_DISP_IS_THREAD(n)) 2731145256Sjkoshy p->pm_rowdisp = PMC_DISP_THREAD; 2732145256Sjkoshy else 2733145256Sjkoshy p->pm_rowdisp = PMC_DISP_FREE; 2734145256Sjkoshy 2735145256Sjkoshy p->pm_ownerpid = -1; 2736145256Sjkoshy 2737145256Sjkoshy if (pm == NULL) /* no PMC associated */ 2738145256Sjkoshy continue; 2739145256Sjkoshy 2740145256Sjkoshy po = pm->pm_owner; 2741145256Sjkoshy 2742145256Sjkoshy KASSERT(po->po_owner != NULL, 2743145256Sjkoshy ("[pmc,%d] pmc_owner had a null proc pointer", 2744145256Sjkoshy __LINE__)); 2745145256Sjkoshy 2746145256Sjkoshy p->pm_ownerpid = po->po_owner->p_pid; 2747145774Sjkoshy p->pm_mode = PMC_TO_MODE(pm); 2748145256Sjkoshy p->pm_event = pm->pm_event; 2749145256Sjkoshy p->pm_flags = pm->pm_flags; 2750145256Sjkoshy 2751145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2752145256Sjkoshy p->pm_reloadcount = 2753145256Sjkoshy pm->pm_sc.pm_reloadcount; 2754145256Sjkoshy } 2755145256Sjkoshy 2756145256Sjkoshy pmc_restore_cpu_binding(&pb); 2757145256Sjkoshy 2758145256Sjkoshy /* now copy out the PMC info collected */ 2759145256Sjkoshy if (error == 0) 2760145256Sjkoshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 2761145256Sjkoshy 2762145256Sjkoshy FREE(pmcinfo, M_PMC); 2763145256Sjkoshy } 2764145256Sjkoshy break; 2765145256Sjkoshy 2766145256Sjkoshy 2767145256Sjkoshy /* 2768145256Sjkoshy * Set the administrative state of a PMC. I.e. whether 2769145256Sjkoshy * the PMC is to be used or not. 2770145256Sjkoshy */ 2771145256Sjkoshy 2772145256Sjkoshy case PMC_OP_PMCADMIN: 2773145256Sjkoshy { 2774145256Sjkoshy int cpu, ri; 2775145256Sjkoshy enum pmc_state request; 2776145256Sjkoshy struct pmc_cpu *pc; 2777145256Sjkoshy struct pmc_hw *phw; 2778145256Sjkoshy struct pmc_op_pmcadmin pma; 2779145256Sjkoshy struct pmc_binding pb; 2780145256Sjkoshy 2781145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2782145256Sjkoshy 2783145256Sjkoshy KASSERT(td == curthread, 2784145256Sjkoshy ("[pmc,%d] td != curthread", __LINE__)); 2785145256Sjkoshy 2786164033Srwatson error = priv_check(td, PRIV_PMC_MANAGE); 2787164033Srwatson if (error) 2788145256Sjkoshy break; 2789145256Sjkoshy 2790145256Sjkoshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 2791145256Sjkoshy break; 2792145256Sjkoshy 2793145256Sjkoshy cpu = pma.pm_cpu; 2794145256Sjkoshy 2795145256Sjkoshy if (cpu < 0 || cpu >= mp_ncpus) { 2796145256Sjkoshy error = EINVAL; 2797145256Sjkoshy break; 2798145256Sjkoshy } 2799145256Sjkoshy 2800145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 2801145256Sjkoshy error = ENXIO; 2802145256Sjkoshy break; 2803145256Sjkoshy } 2804145256Sjkoshy 2805145256Sjkoshy request = pma.pm_state; 2806145256Sjkoshy 2807145256Sjkoshy if (request != PMC_STATE_DISABLED && 2808145256Sjkoshy request != PMC_STATE_FREE) { 2809145256Sjkoshy error = EINVAL; 2810145256Sjkoshy break; 2811145256Sjkoshy } 2812145256Sjkoshy 2813145256Sjkoshy ri = pma.pm_pmc; /* pmc id == row index */ 2814145256Sjkoshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 2815145256Sjkoshy error = EINVAL; 2816145256Sjkoshy break; 2817145256Sjkoshy } 2818145256Sjkoshy 2819145256Sjkoshy /* 2820145256Sjkoshy * We can't disable a PMC with a row-index allocated 2821145256Sjkoshy * for process virtual PMCs. 2822145256Sjkoshy */ 2823145256Sjkoshy 2824145256Sjkoshy if (PMC_ROW_DISP_IS_THREAD(ri) && 2825145256Sjkoshy request == PMC_STATE_DISABLED) { 2826145256Sjkoshy error = EBUSY; 2827145256Sjkoshy break; 2828145256Sjkoshy } 2829145256Sjkoshy 2830145256Sjkoshy /* 2831145256Sjkoshy * otherwise, this PMC on this CPU is either free or 2832145256Sjkoshy * in system-wide mode. 2833145256Sjkoshy */ 2834145256Sjkoshy 2835145256Sjkoshy pmc_save_cpu_binding(&pb); 2836145256Sjkoshy pmc_select_cpu(cpu); 2837145256Sjkoshy 2838145256Sjkoshy pc = pmc_pcpu[cpu]; 2839145256Sjkoshy phw = pc->pc_hwpmcs[ri]; 2840145256Sjkoshy 2841145256Sjkoshy /* 2842145256Sjkoshy * XXX do we need some kind of 'forced' disable? 2843145256Sjkoshy */ 2844145256Sjkoshy 2845145256Sjkoshy if (phw->phw_pmc == NULL) { 2846145256Sjkoshy if (request == PMC_STATE_DISABLED && 2847145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 2848145256Sjkoshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 2849145256Sjkoshy PMC_MARK_ROW_STANDALONE(ri); 2850145256Sjkoshy } else if (request == PMC_STATE_FREE && 2851145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 2852145256Sjkoshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 2853145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2854145256Sjkoshy } 2855145256Sjkoshy /* other cases are a no-op */ 2856145256Sjkoshy } else 2857145256Sjkoshy error = EBUSY; 2858145256Sjkoshy 2859145256Sjkoshy pmc_restore_cpu_binding(&pb); 2860145256Sjkoshy } 2861145256Sjkoshy break; 2862145256Sjkoshy 2863145256Sjkoshy 2864145256Sjkoshy /* 2865145256Sjkoshy * Allocate a PMC. 2866145256Sjkoshy */ 2867145256Sjkoshy 2868145256Sjkoshy case PMC_OP_PMCALLOCATE: 2869145256Sjkoshy { 2870145256Sjkoshy uint32_t caps; 2871145256Sjkoshy u_int cpu; 2872145256Sjkoshy int n; 2873145256Sjkoshy enum pmc_mode mode; 2874145256Sjkoshy struct pmc *pmc; 2875145774Sjkoshy struct pmc_hw *phw; 2876145256Sjkoshy struct pmc_op_pmcallocate pa; 2877145256Sjkoshy struct pmc_binding pb; 2878145256Sjkoshy 2879145256Sjkoshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 2880145256Sjkoshy break; 2881145256Sjkoshy 2882145256Sjkoshy caps = pa.pm_caps; 2883145256Sjkoshy mode = pa.pm_mode; 2884145256Sjkoshy cpu = pa.pm_cpu; 2885145256Sjkoshy 2886145256Sjkoshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 2887145256Sjkoshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 2888145256Sjkoshy (cpu != (u_int) PMC_CPU_ANY && cpu >= (u_int) mp_ncpus)) { 2889145256Sjkoshy error = EINVAL; 2890145256Sjkoshy break; 2891145256Sjkoshy } 2892145256Sjkoshy 2893145256Sjkoshy /* 2894145256Sjkoshy * Virtual PMCs should only ask for a default CPU. 2895145256Sjkoshy * System mode PMCs need to specify a non-default CPU. 2896145256Sjkoshy */ 2897145256Sjkoshy 2898145256Sjkoshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 2899145256Sjkoshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 2900145256Sjkoshy error = EINVAL; 2901145256Sjkoshy break; 2902145256Sjkoshy } 2903145256Sjkoshy 2904145256Sjkoshy /* 2905145256Sjkoshy * Check that a disabled CPU is not being asked for. 2906145256Sjkoshy */ 2907145256Sjkoshy 2908145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && pmc_cpu_is_disabled(cpu)) { 2909145256Sjkoshy error = ENXIO; 2910145256Sjkoshy break; 2911145256Sjkoshy } 2912145256Sjkoshy 2913145256Sjkoshy /* 2914145256Sjkoshy * Refuse an allocation for a system-wide PMC if this 2915145256Sjkoshy * process has been jailed, or if this process lacks 2916145256Sjkoshy * super-user credentials and the sysctl tunable 2917145256Sjkoshy * 'security.bsd.unprivileged_syspmcs' is zero. 2918145256Sjkoshy */ 2919145256Sjkoshy 2920145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2921164033Srwatson if (jailed(curthread->td_ucred)) { 2922145256Sjkoshy error = EPERM; 2923164033Srwatson break; 2924164033Srwatson } 2925164033Srwatson if (!pmc_unprivileged_syspmcs) { 2926164033Srwatson error = priv_check(curthread, 2927164033Srwatson PRIV_PMC_SYSTEM); 2928164033Srwatson if (error) 2929164033Srwatson break; 2930164033Srwatson } 2931145256Sjkoshy } 2932145256Sjkoshy 2933145256Sjkoshy if (error) 2934145256Sjkoshy break; 2935145256Sjkoshy 2936145256Sjkoshy /* 2937145256Sjkoshy * Look for valid values for 'pm_flags' 2938145256Sjkoshy */ 2939145256Sjkoshy 2940147191Sjkoshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 2941147191Sjkoshy PMC_F_LOG_PROCEXIT)) != 0) { 2942145256Sjkoshy error = EINVAL; 2943145256Sjkoshy break; 2944145256Sjkoshy } 2945145256Sjkoshy 2946147191Sjkoshy /* process logging options are not allowed for system PMCs */ 2947147191Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 2948147191Sjkoshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 2949147191Sjkoshy error = EINVAL; 2950147191Sjkoshy break; 2951147191Sjkoshy } 2952147191Sjkoshy 2953145256Sjkoshy /* 2954145256Sjkoshy * All sampling mode PMCs need to be able to interrupt the 2955145256Sjkoshy * CPU. 2956145256Sjkoshy */ 2957147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode)) 2958145256Sjkoshy caps |= PMC_CAP_INTERRUPT; 2959145256Sjkoshy 2960149374Sjkoshy /* A valid class specifier should have been passed in. */ 2961149374Sjkoshy for (n = 0; n < md->pmd_nclass; n++) 2962149374Sjkoshy if (md->pmd_classes[n].pm_class == pa.pm_class) 2963149374Sjkoshy break; 2964149374Sjkoshy if (n == md->pmd_nclass) { 2965149374Sjkoshy error = EINVAL; 2966149374Sjkoshy break; 2967149374Sjkoshy } 2968149374Sjkoshy 2969149374Sjkoshy /* The requested PMC capabilities should be feasible. */ 2970149374Sjkoshy if ((md->pmd_classes[n].pm_caps & caps) != caps) { 2971149374Sjkoshy error = EOPNOTSUPP; 2972149374Sjkoshy break; 2973149374Sjkoshy } 2974149374Sjkoshy 2975145256Sjkoshy PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 2976145256Sjkoshy pa.pm_ev, caps, mode, cpu); 2977145256Sjkoshy 2978145256Sjkoshy pmc = pmc_allocate_pmc_descriptor(); 2979145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 2980145774Sjkoshy PMC_ID_INVALID); 2981145256Sjkoshy pmc->pm_event = pa.pm_ev; 2982145256Sjkoshy pmc->pm_state = PMC_STATE_FREE; 2983145256Sjkoshy pmc->pm_caps = caps; 2984145256Sjkoshy pmc->pm_flags = pa.pm_flags; 2985145256Sjkoshy 2986145256Sjkoshy /* switch thread to CPU 'cpu' */ 2987145256Sjkoshy pmc_save_cpu_binding(&pb); 2988145256Sjkoshy 2989145256Sjkoshy#define PMC_IS_SHAREABLE_PMC(cpu, n) \ 2990145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 2991145256Sjkoshy PMC_PHW_FLAG_IS_SHAREABLE) 2992145256Sjkoshy#define PMC_IS_UNALLOCATED(cpu, n) \ 2993145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 2994145256Sjkoshy 2995145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2996145256Sjkoshy pmc_select_cpu(cpu); 2997145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 2998145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 2999145256Sjkoshy pmc_can_allocate_rowindex( 3000145774Sjkoshy curthread->td_proc, n, cpu) == 0 && 3001145256Sjkoshy (PMC_IS_UNALLOCATED(cpu, n) || 3002145256Sjkoshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 3003145256Sjkoshy md->pmd_allocate_pmc(cpu, n, pmc, 3004145256Sjkoshy &pa) == 0) 3005145256Sjkoshy break; 3006145256Sjkoshy } else { 3007145256Sjkoshy /* Process virtual mode */ 3008145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3009145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3010145256Sjkoshy pmc_can_allocate_rowindex( 3011145774Sjkoshy curthread->td_proc, n, 3012145774Sjkoshy PMC_CPU_ANY) == 0 && 3013145256Sjkoshy md->pmd_allocate_pmc(curthread->td_oncpu, 3014145256Sjkoshy n, pmc, &pa) == 0) 3015145256Sjkoshy break; 3016145256Sjkoshy } 3017145256Sjkoshy } 3018145256Sjkoshy 3019145256Sjkoshy#undef PMC_IS_UNALLOCATED 3020145256Sjkoshy#undef PMC_IS_SHAREABLE_PMC 3021145256Sjkoshy 3022145256Sjkoshy pmc_restore_cpu_binding(&pb); 3023145256Sjkoshy 3024145256Sjkoshy if (n == (int) md->pmd_npmc) { 3025145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3026145256Sjkoshy FREE(pmc, M_PMC); 3027145256Sjkoshy pmc = NULL; 3028145256Sjkoshy error = EINVAL; 3029145256Sjkoshy break; 3030145256Sjkoshy } 3031145256Sjkoshy 3032145774Sjkoshy /* Fill in the correct value in the ID field */ 3033145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 3034145256Sjkoshy 3035145774Sjkoshy PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 3036145774Sjkoshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 3037145774Sjkoshy 3038147191Sjkoshy /* Process mode PMCs with logging enabled need log files */ 3039147191Sjkoshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 3040147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3041147191Sjkoshy 3042147191Sjkoshy /* All system mode sampling PMCs require a log file */ 3043147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 3044147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3045147191Sjkoshy 3046145256Sjkoshy /* 3047145256Sjkoshy * Configure global pmc's immediately 3048145256Sjkoshy */ 3049145256Sjkoshy 3050145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 3051145774Sjkoshy 3052145774Sjkoshy pmc_save_cpu_binding(&pb); 3053145774Sjkoshy pmc_select_cpu(cpu); 3054145774Sjkoshy 3055145774Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 3056145774Sjkoshy 3057145774Sjkoshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 3058145774Sjkoshy (error = md->pmd_config_pmc(cpu, n, pmc)) != 0) { 3059145256Sjkoshy (void) md->pmd_release_pmc(cpu, n, pmc); 3060145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3061145256Sjkoshy FREE(pmc, M_PMC); 3062145256Sjkoshy pmc = NULL; 3063145774Sjkoshy pmc_restore_cpu_binding(&pb); 3064145774Sjkoshy error = EPERM; 3065145256Sjkoshy break; 3066145256Sjkoshy } 3067145256Sjkoshy 3068145774Sjkoshy pmc_restore_cpu_binding(&pb); 3069145774Sjkoshy } 3070145256Sjkoshy 3071145256Sjkoshy pmc->pm_state = PMC_STATE_ALLOCATED; 3072145256Sjkoshy 3073145256Sjkoshy /* 3074145256Sjkoshy * mark row disposition 3075145256Sjkoshy */ 3076145256Sjkoshy 3077145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 3078145256Sjkoshy PMC_MARK_ROW_STANDALONE(n); 3079145256Sjkoshy else 3080145256Sjkoshy PMC_MARK_ROW_THREAD(n); 3081145256Sjkoshy 3082145256Sjkoshy /* 3083145256Sjkoshy * Register this PMC with the current thread as its owner. 3084145256Sjkoshy */ 3085145256Sjkoshy 3086145256Sjkoshy if ((error = 3087145256Sjkoshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 3088145256Sjkoshy pmc_release_pmc_descriptor(pmc); 3089145256Sjkoshy FREE(pmc, M_PMC); 3090145256Sjkoshy pmc = NULL; 3091145256Sjkoshy break; 3092145256Sjkoshy } 3093145256Sjkoshy 3094145256Sjkoshy /* 3095145256Sjkoshy * Return the allocated index. 3096145256Sjkoshy */ 3097145256Sjkoshy 3098145774Sjkoshy pa.pm_pmcid = pmc->pm_id; 3099145256Sjkoshy 3100145256Sjkoshy error = copyout(&pa, arg, sizeof(pa)); 3101145256Sjkoshy } 3102145256Sjkoshy break; 3103145256Sjkoshy 3104145256Sjkoshy 3105145256Sjkoshy /* 3106145256Sjkoshy * Attach a PMC to a process. 3107145256Sjkoshy */ 3108145256Sjkoshy 3109145256Sjkoshy case PMC_OP_PMCATTACH: 3110145256Sjkoshy { 3111145256Sjkoshy struct pmc *pm; 3112145256Sjkoshy struct proc *p; 3113145256Sjkoshy struct pmc_op_pmcattach a; 3114145256Sjkoshy 3115145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3116145256Sjkoshy 3117145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3118145256Sjkoshy break; 3119145256Sjkoshy 3120145256Sjkoshy if (a.pm_pid < 0) { 3121145256Sjkoshy error = EINVAL; 3122145256Sjkoshy break; 3123145256Sjkoshy } else if (a.pm_pid == 0) 3124145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3125145256Sjkoshy 3126145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3127145256Sjkoshy break; 3128145256Sjkoshy 3129145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 3130145256Sjkoshy error = EINVAL; 3131145256Sjkoshy break; 3132145256Sjkoshy } 3133145256Sjkoshy 3134145256Sjkoshy /* PMCs may be (re)attached only when allocated or stopped */ 3135145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3136145256Sjkoshy error = EBUSY; 3137145256Sjkoshy break; 3138145256Sjkoshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 3139145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED) { 3140145256Sjkoshy error = EINVAL; 3141145256Sjkoshy break; 3142145256Sjkoshy } 3143145256Sjkoshy 3144145256Sjkoshy /* lookup pid */ 3145145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3146145256Sjkoshy error = ESRCH; 3147145256Sjkoshy break; 3148145256Sjkoshy } 3149145256Sjkoshy 3150145256Sjkoshy /* 3151145256Sjkoshy * Ignore processes that are working on exiting. 3152145256Sjkoshy */ 3153145256Sjkoshy if (p->p_flag & P_WEXIT) { 3154145256Sjkoshy error = ESRCH; 3155145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3156145256Sjkoshy break; 3157145256Sjkoshy } 3158145256Sjkoshy 3159145256Sjkoshy /* 3160145256Sjkoshy * we are allowed to attach a PMC to a process if 3161145256Sjkoshy * we can debug it. 3162145256Sjkoshy */ 3163145256Sjkoshy error = p_candebug(curthread, p); 3164145256Sjkoshy 3165145256Sjkoshy PROC_UNLOCK(p); 3166145256Sjkoshy 3167145256Sjkoshy if (error == 0) 3168145256Sjkoshy error = pmc_attach_process(p, pm); 3169145256Sjkoshy } 3170145256Sjkoshy break; 3171145256Sjkoshy 3172145256Sjkoshy 3173145256Sjkoshy /* 3174145256Sjkoshy * Detach an attached PMC from a process. 3175145256Sjkoshy */ 3176145256Sjkoshy 3177145256Sjkoshy case PMC_OP_PMCDETACH: 3178145256Sjkoshy { 3179145256Sjkoshy struct pmc *pm; 3180145256Sjkoshy struct proc *p; 3181145256Sjkoshy struct pmc_op_pmcattach a; 3182145256Sjkoshy 3183145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3184145256Sjkoshy break; 3185145256Sjkoshy 3186145256Sjkoshy if (a.pm_pid < 0) { 3187145256Sjkoshy error = EINVAL; 3188145256Sjkoshy break; 3189145256Sjkoshy } else if (a.pm_pid == 0) 3190145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3191145256Sjkoshy 3192145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3193145256Sjkoshy break; 3194145256Sjkoshy 3195145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3196145256Sjkoshy error = ESRCH; 3197145256Sjkoshy break; 3198145256Sjkoshy } 3199145256Sjkoshy 3200145256Sjkoshy /* 3201145256Sjkoshy * Treat processes that are in the process of exiting 3202145256Sjkoshy * as if they were not present. 3203145256Sjkoshy */ 3204145256Sjkoshy 3205145256Sjkoshy if (p->p_flag & P_WEXIT) 3206145256Sjkoshy error = ESRCH; 3207145256Sjkoshy 3208145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3209145256Sjkoshy 3210145256Sjkoshy if (error == 0) 3211145256Sjkoshy error = pmc_detach_process(p, pm); 3212145256Sjkoshy } 3213145256Sjkoshy break; 3214145256Sjkoshy 3215145256Sjkoshy 3216145256Sjkoshy /* 3217147191Sjkoshy * Retrieve the MSR number associated with the counter 3218147191Sjkoshy * 'pmc_id'. This allows processes to directly use RDPMC 3219147191Sjkoshy * instructions to read their PMCs, without the overhead of a 3220147191Sjkoshy * system call. 3221147191Sjkoshy */ 3222147191Sjkoshy 3223147191Sjkoshy case PMC_OP_PMCGETMSR: 3224147191Sjkoshy { 3225147191Sjkoshy int ri; 3226147191Sjkoshy struct pmc *pm; 3227147191Sjkoshy struct pmc_target *pt; 3228147191Sjkoshy struct pmc_op_getmsr gm; 3229147191Sjkoshy 3230147191Sjkoshy PMC_DOWNGRADE_SX(); 3231147191Sjkoshy 3232147191Sjkoshy /* CPU has no 'GETMSR' support */ 3233147191Sjkoshy if (md->pmd_get_msr == NULL) { 3234147191Sjkoshy error = ENOSYS; 3235147191Sjkoshy break; 3236147191Sjkoshy } 3237147191Sjkoshy 3238147191Sjkoshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3239147191Sjkoshy break; 3240147191Sjkoshy 3241147191Sjkoshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3242147191Sjkoshy break; 3243147191Sjkoshy 3244147191Sjkoshy /* 3245147191Sjkoshy * The allocated PMC has to be a process virtual PMC, 3246147191Sjkoshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3247147191Sjkoshy * read using the PMCREAD operation since they may be 3248147191Sjkoshy * allocated on a different CPU than the one we could 3249147191Sjkoshy * be running on at the time of the RDPMC instruction. 3250147191Sjkoshy * 3251147191Sjkoshy * The GETMSR operation is not allowed for PMCs that 3252147191Sjkoshy * are inherited across processes. 3253147191Sjkoshy */ 3254147191Sjkoshy 3255147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3256147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3257147191Sjkoshy error = EINVAL; 3258147191Sjkoshy break; 3259147191Sjkoshy } 3260147191Sjkoshy 3261147191Sjkoshy /* 3262147191Sjkoshy * It only makes sense to use a RDPMC (or its 3263147191Sjkoshy * equivalent instruction on non-x86 architectures) on 3264147191Sjkoshy * a process that has allocated and attached a PMC to 3265147191Sjkoshy * itself. Conversely the PMC is only allowed to have 3266147191Sjkoshy * one process attached to it -- its owner. 3267147191Sjkoshy */ 3268147191Sjkoshy 3269147191Sjkoshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3270147191Sjkoshy LIST_NEXT(pt, pt_next) != NULL || 3271147191Sjkoshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3272147191Sjkoshy error = EINVAL; 3273147191Sjkoshy break; 3274147191Sjkoshy } 3275147191Sjkoshy 3276147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3277147191Sjkoshy 3278147191Sjkoshy if ((error = (*md->pmd_get_msr)(ri, &gm.pm_msr)) < 0) 3279147191Sjkoshy break; 3280147191Sjkoshy 3281147191Sjkoshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3282147191Sjkoshy break; 3283147191Sjkoshy 3284147191Sjkoshy /* 3285147191Sjkoshy * Mark our process as using MSRs. Update machine 3286147191Sjkoshy * state using a forced context switch. 3287147191Sjkoshy */ 3288147191Sjkoshy 3289147191Sjkoshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3290147191Sjkoshy pmc_force_context_switch(); 3291147191Sjkoshy 3292147191Sjkoshy } 3293147191Sjkoshy break; 3294147191Sjkoshy 3295147191Sjkoshy /* 3296145256Sjkoshy * Release an allocated PMC 3297145256Sjkoshy */ 3298145256Sjkoshy 3299145256Sjkoshy case PMC_OP_PMCRELEASE: 3300145256Sjkoshy { 3301145256Sjkoshy pmc_id_t pmcid; 3302145256Sjkoshy struct pmc *pm; 3303145256Sjkoshy struct pmc_owner *po; 3304145256Sjkoshy struct pmc_op_simple sp; 3305145256Sjkoshy 3306145256Sjkoshy /* 3307145256Sjkoshy * Find PMC pointer for the named PMC. 3308145256Sjkoshy * 3309145256Sjkoshy * Use pmc_release_pmc_descriptor() to switch off the 3310145256Sjkoshy * PMC, remove all its target threads, and remove the 3311145256Sjkoshy * PMC from its owner's list. 3312145256Sjkoshy * 3313145256Sjkoshy * Remove the owner record if this is the last PMC 3314145256Sjkoshy * owned. 3315145256Sjkoshy * 3316145256Sjkoshy * Free up space. 3317145256Sjkoshy */ 3318145256Sjkoshy 3319145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3320145256Sjkoshy break; 3321145256Sjkoshy 3322145256Sjkoshy pmcid = sp.pm_pmcid; 3323145256Sjkoshy 3324145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3325145256Sjkoshy break; 3326145256Sjkoshy 3327145256Sjkoshy po = pm->pm_owner; 3328145256Sjkoshy pmc_release_pmc_descriptor(pm); 3329145256Sjkoshy pmc_maybe_remove_owner(po); 3330145256Sjkoshy 3331145256Sjkoshy FREE(pm, M_PMC); 3332145256Sjkoshy } 3333145256Sjkoshy break; 3334145256Sjkoshy 3335145256Sjkoshy 3336145256Sjkoshy /* 3337145256Sjkoshy * Read and/or write a PMC. 3338145256Sjkoshy */ 3339145256Sjkoshy 3340145256Sjkoshy case PMC_OP_PMCRW: 3341145256Sjkoshy { 3342145256Sjkoshy uint32_t cpu, ri; 3343145256Sjkoshy struct pmc *pm; 3344145256Sjkoshy struct pmc_op_pmcrw *pprw; 3345145256Sjkoshy struct pmc_op_pmcrw prw; 3346145256Sjkoshy struct pmc_binding pb; 3347145256Sjkoshy pmc_value_t oldvalue; 3348145256Sjkoshy 3349145256Sjkoshy PMC_DOWNGRADE_SX(); 3350145256Sjkoshy 3351145256Sjkoshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3352145256Sjkoshy break; 3353145256Sjkoshy 3354145301Simp ri = 0; 3355145256Sjkoshy PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3356145256Sjkoshy prw.pm_flags); 3357145256Sjkoshy 3358145256Sjkoshy /* must have at least one flag set */ 3359145256Sjkoshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3360145256Sjkoshy error = EINVAL; 3361145256Sjkoshy break; 3362145256Sjkoshy } 3363145256Sjkoshy 3364145256Sjkoshy /* locate pmc descriptor */ 3365145256Sjkoshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3366145256Sjkoshy break; 3367145256Sjkoshy 3368145256Sjkoshy /* Can't read a PMC that hasn't been started. */ 3369145256Sjkoshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3370145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED && 3371145256Sjkoshy pm->pm_state != PMC_STATE_RUNNING) { 3372145256Sjkoshy error = EINVAL; 3373145256Sjkoshy break; 3374145256Sjkoshy } 3375145256Sjkoshy 3376145256Sjkoshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3377145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3378145256Sjkoshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3379145256Sjkoshy error = EBUSY; 3380145256Sjkoshy break; 3381145256Sjkoshy } 3382145256Sjkoshy 3383145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3384145256Sjkoshy 3385145774Sjkoshy /* 3386145774Sjkoshy * If this PMC is attached to its owner (i.e., 3387145774Sjkoshy * the process requesting this operation) and 3388145774Sjkoshy * is running, then attempt to get an 3389145774Sjkoshy * upto-date reading from hardware for a READ. 3390145774Sjkoshy * Writes are only allowed when the PMC is 3391145774Sjkoshy * stopped, so only update the saved value 3392145774Sjkoshy * field. 3393145774Sjkoshy * 3394145774Sjkoshy * If the PMC is not running, or is not 3395145774Sjkoshy * attached to its owner, read/write to the 3396145774Sjkoshy * savedvalue field. 3397145774Sjkoshy */ 3398145774Sjkoshy 3399145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3400145774Sjkoshy 3401145256Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3402145774Sjkoshy cpu = curthread->td_oncpu; 3403145774Sjkoshy 3404145774Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3405145774Sjkoshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3406145774Sjkoshy (pm->pm_state == PMC_STATE_RUNNING)) 3407145774Sjkoshy error = (*md->pmd_read_pmc)(cpu, ri, 3408145774Sjkoshy &oldvalue); 3409145774Sjkoshy else 3410145774Sjkoshy oldvalue = pm->pm_gv.pm_savedvalue; 3411145774Sjkoshy } 3412145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3413145256Sjkoshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3414145774Sjkoshy 3415145256Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3416145256Sjkoshy 3417145256Sjkoshy } else { /* System mode PMCs */ 3418145774Sjkoshy cpu = PMC_TO_CPU(pm); 3419145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3420145256Sjkoshy 3421145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) { 3422145256Sjkoshy error = ENXIO; 3423145256Sjkoshy break; 3424145256Sjkoshy } 3425145256Sjkoshy 3426145256Sjkoshy /* move this thread to CPU 'cpu' */ 3427145256Sjkoshy pmc_save_cpu_binding(&pb); 3428145256Sjkoshy pmc_select_cpu(cpu); 3429145256Sjkoshy 3430145774Sjkoshy critical_enter(); 3431145256Sjkoshy /* save old value */ 3432145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3433145256Sjkoshy if ((error = (*md->pmd_read_pmc)(cpu, ri, 3434145256Sjkoshy &oldvalue))) 3435145256Sjkoshy goto error; 3436145256Sjkoshy /* write out new value */ 3437145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3438145256Sjkoshy error = (*md->pmd_write_pmc)(cpu, ri, 3439145256Sjkoshy prw.pm_value); 3440145256Sjkoshy error: 3441145774Sjkoshy critical_exit(); 3442145256Sjkoshy pmc_restore_cpu_binding(&pb); 3443145256Sjkoshy if (error) 3444145256Sjkoshy break; 3445145256Sjkoshy } 3446145256Sjkoshy 3447145256Sjkoshy pprw = (struct pmc_op_pmcrw *) arg; 3448145256Sjkoshy 3449153110Sru#ifdef DEBUG 3450145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3451145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3452145256Sjkoshy ri, prw.pm_value, oldvalue); 3453156778Sjkoshy else if (prw.pm_flags & PMC_F_OLDVALUE) 3454145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3455145256Sjkoshy#endif 3456145256Sjkoshy 3457145256Sjkoshy /* return old value if requested */ 3458145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3459145256Sjkoshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3460145256Sjkoshy sizeof(prw.pm_value)))) 3461145256Sjkoshy break; 3462145256Sjkoshy 3463145256Sjkoshy } 3464145256Sjkoshy break; 3465145256Sjkoshy 3466145256Sjkoshy 3467145256Sjkoshy /* 3468145256Sjkoshy * Set the sampling rate for a sampling mode PMC and the 3469145256Sjkoshy * initial count for a counting mode PMC. 3470145256Sjkoshy */ 3471145256Sjkoshy 3472145256Sjkoshy case PMC_OP_PMCSETCOUNT: 3473145256Sjkoshy { 3474145256Sjkoshy struct pmc *pm; 3475145256Sjkoshy struct pmc_op_pmcsetcount sc; 3476145256Sjkoshy 3477145256Sjkoshy PMC_DOWNGRADE_SX(); 3478145256Sjkoshy 3479145256Sjkoshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3480145256Sjkoshy break; 3481145256Sjkoshy 3482145256Sjkoshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3483145256Sjkoshy break; 3484145256Sjkoshy 3485145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3486145256Sjkoshy error = EBUSY; 3487145256Sjkoshy break; 3488145256Sjkoshy } 3489145256Sjkoshy 3490145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3491145256Sjkoshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3492145256Sjkoshy else 3493145256Sjkoshy pm->pm_sc.pm_initial = sc.pm_count; 3494145256Sjkoshy } 3495145256Sjkoshy break; 3496145256Sjkoshy 3497145256Sjkoshy 3498145256Sjkoshy /* 3499145256Sjkoshy * Start a PMC. 3500145256Sjkoshy */ 3501145256Sjkoshy 3502145256Sjkoshy case PMC_OP_PMCSTART: 3503145256Sjkoshy { 3504145256Sjkoshy pmc_id_t pmcid; 3505145256Sjkoshy struct pmc *pm; 3506145256Sjkoshy struct pmc_op_simple sp; 3507145256Sjkoshy 3508145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3509145256Sjkoshy 3510145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3511145256Sjkoshy break; 3512145256Sjkoshy 3513145256Sjkoshy pmcid = sp.pm_pmcid; 3514145256Sjkoshy 3515145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3516145256Sjkoshy break; 3517145256Sjkoshy 3518145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3519145774Sjkoshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3520145774Sjkoshy pm->pm_id, pmcid)); 3521145256Sjkoshy 3522145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3523145256Sjkoshy break; 3524145256Sjkoshy else if (pm->pm_state != PMC_STATE_STOPPED && 3525145256Sjkoshy pm->pm_state != PMC_STATE_ALLOCATED) { 3526145256Sjkoshy error = EINVAL; 3527145256Sjkoshy break; 3528145256Sjkoshy } 3529145256Sjkoshy 3530145256Sjkoshy error = pmc_start(pm); 3531145256Sjkoshy } 3532145256Sjkoshy break; 3533145256Sjkoshy 3534145256Sjkoshy 3535145256Sjkoshy /* 3536145256Sjkoshy * Stop a PMC. 3537145256Sjkoshy */ 3538145256Sjkoshy 3539145256Sjkoshy case PMC_OP_PMCSTOP: 3540145256Sjkoshy { 3541145256Sjkoshy pmc_id_t pmcid; 3542145256Sjkoshy struct pmc *pm; 3543145256Sjkoshy struct pmc_op_simple sp; 3544145256Sjkoshy 3545145256Sjkoshy PMC_DOWNGRADE_SX(); 3546145256Sjkoshy 3547145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3548145256Sjkoshy break; 3549145256Sjkoshy 3550145256Sjkoshy pmcid = sp.pm_pmcid; 3551145256Sjkoshy 3552145256Sjkoshy /* 3553145256Sjkoshy * Mark the PMC as inactive and invoke the MD stop 3554145256Sjkoshy * routines if needed. 3555145256Sjkoshy */ 3556145256Sjkoshy 3557145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3558145256Sjkoshy break; 3559145256Sjkoshy 3560145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3561145774Sjkoshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3562145774Sjkoshy pm->pm_id, pmcid)); 3563145256Sjkoshy 3564145256Sjkoshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3565145256Sjkoshy break; 3566145256Sjkoshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3567145256Sjkoshy error = EINVAL; 3568145256Sjkoshy break; 3569145256Sjkoshy } 3570145256Sjkoshy 3571145256Sjkoshy error = pmc_stop(pm); 3572145256Sjkoshy } 3573145256Sjkoshy break; 3574145256Sjkoshy 3575145256Sjkoshy 3576145256Sjkoshy /* 3577147867Sjkoshy * Write a user supplied value to the log file. 3578145256Sjkoshy */ 3579145256Sjkoshy 3580145256Sjkoshy case PMC_OP_WRITELOG: 3581145256Sjkoshy { 3582147191Sjkoshy struct pmc_op_writelog wl; 3583147191Sjkoshy struct pmc_owner *po; 3584145256Sjkoshy 3585145256Sjkoshy PMC_DOWNGRADE_SX(); 3586145256Sjkoshy 3587147191Sjkoshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 3588145256Sjkoshy break; 3589145256Sjkoshy 3590147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3591145256Sjkoshy error = EINVAL; 3592145256Sjkoshy break; 3593145256Sjkoshy } 3594145256Sjkoshy 3595147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 3596145774Sjkoshy error = EINVAL; 3597145774Sjkoshy break; 3598145774Sjkoshy } 3599145774Sjkoshy 3600147191Sjkoshy error = pmclog_process_userlog(po, &wl); 3601145256Sjkoshy } 3602145256Sjkoshy break; 3603145256Sjkoshy 3604147191Sjkoshy 3605145256Sjkoshy default: 3606145256Sjkoshy error = EINVAL; 3607145256Sjkoshy break; 3608145256Sjkoshy } 3609145256Sjkoshy 3610145256Sjkoshy if (is_sx_downgraded) 3611145256Sjkoshy sx_sunlock(&pmc_sx); 3612145256Sjkoshy else 3613145256Sjkoshy sx_xunlock(&pmc_sx); 3614145256Sjkoshy 3615145256Sjkoshy if (error) 3616145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 3617145256Sjkoshy 3618147191Sjkoshy PICKUP_GIANT(); 3619147191Sjkoshy 3620145256Sjkoshy return error; 3621145256Sjkoshy} 3622145256Sjkoshy 3623145256Sjkoshy/* 3624145256Sjkoshy * Helper functions 3625145256Sjkoshy */ 3626145256Sjkoshy 3627147191Sjkoshy 3628145256Sjkoshy/* 3629147191Sjkoshy * Interrupt processing. 3630147191Sjkoshy * 3631147191Sjkoshy * Find a free slot in the per-cpu array of PC samples and write the 3632147191Sjkoshy * current (PMC,PID,PC) triple to it. If an event was successfully 3633147191Sjkoshy * added, a bit is set in mask 'pmc_cpumask' denoting that the 3634147191Sjkoshy * DO_SAMPLES hook needs to be invoked from the clock handler. 3635147191Sjkoshy * 3636147191Sjkoshy * This function is meant to be called from an NMI handler. It cannot 3637147191Sjkoshy * use any of the locking primitives supplied by the OS. 3638145256Sjkoshy */ 3639145256Sjkoshy 3640147191Sjkoshyint 3641147708Sjkoshypmc_process_interrupt(int cpu, struct pmc *pm, uintfptr_t pc, int usermode) 3642145256Sjkoshy{ 3643147191Sjkoshy int error, ri; 3644147191Sjkoshy struct thread *td; 3645147191Sjkoshy struct pmc_sample *ps; 3646147191Sjkoshy struct pmc_samplebuffer *psb; 3647145256Sjkoshy 3648147191Sjkoshy error = 0; 3649147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3650145256Sjkoshy 3651147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3652145256Sjkoshy 3653147191Sjkoshy ps = psb->ps_write; 3654147191Sjkoshy if (ps->ps_pc) { /* in use, reader hasn't caught up */ 3655147867Sjkoshy pm->pm_stalled = 1; 3656147191Sjkoshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 3657147191Sjkoshy PMCDBG(SAM,INT,1,"(spc) cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", 3658147708Sjkoshy cpu, pm, (uint64_t) pc, usermode, 3659147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3660147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3661147191Sjkoshy error = ENOMEM; 3662147191Sjkoshy goto done; 3663147191Sjkoshy } 3664145256Sjkoshy 3665147191Sjkoshy /* fill in entry */ 3666147191Sjkoshy PMCDBG(SAM,INT,1,"cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", cpu, pm, 3667147708Sjkoshy (uint64_t) pc, usermode, 3668147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3669147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3670145256Sjkoshy 3671147191Sjkoshy atomic_add_rel_32(&pm->pm_runcount, 1); /* hold onto PMC */ 3672147191Sjkoshy ps->ps_pmc = pm; 3673147191Sjkoshy if ((td = curthread) && td->td_proc) 3674147191Sjkoshy ps->ps_pid = td->td_proc->p_pid; 3675147191Sjkoshy else 3676147191Sjkoshy ps->ps_pid = -1; 3677147191Sjkoshy ps->ps_usermode = usermode; 3678147191Sjkoshy ps->ps_pc = pc; /* mark entry as in use */ 3679145256Sjkoshy 3680147191Sjkoshy /* increment write pointer, modulo ring buffer size */ 3681147191Sjkoshy ps++; 3682147191Sjkoshy if (ps == psb->ps_fence) 3683147191Sjkoshy psb->ps_write = psb->ps_samples; 3684147191Sjkoshy else 3685147191Sjkoshy psb->ps_write = ps; 3686145256Sjkoshy 3687147191Sjkoshy done: 3688147191Sjkoshy /* mark CPU as needing processing */ 3689147191Sjkoshy atomic_set_rel_int(&pmc_cpumask, (1 << cpu)); 3690147191Sjkoshy 3691147191Sjkoshy return error; 3692145256Sjkoshy} 3693145256Sjkoshy 3694147191Sjkoshy 3695145256Sjkoshy/* 3696147191Sjkoshy * Process saved PC samples. 3697145256Sjkoshy */ 3698145256Sjkoshy 3699145256Sjkoshystatic void 3700147191Sjkoshypmc_process_samples(int cpu) 3701145256Sjkoshy{ 3702147191Sjkoshy int n, ri; 3703147191Sjkoshy struct pmc *pm; 3704147191Sjkoshy struct thread *td; 3705147191Sjkoshy struct pmc_owner *po; 3706147191Sjkoshy struct pmc_sample *ps; 3707147191Sjkoshy struct pmc_samplebuffer *psb; 3708145256Sjkoshy 3709147191Sjkoshy KASSERT(PCPU_GET(cpuid) == cpu, 3710147191Sjkoshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 3711147191Sjkoshy PCPU_GET(cpuid), cpu)); 3712145256Sjkoshy 3713147191Sjkoshy psb = pmc_pcpu[cpu]->pc_sb; 3714147191Sjkoshy 3715147191Sjkoshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 3716147191Sjkoshy 3717147191Sjkoshy ps = psb->ps_read; 3718147191Sjkoshy if (ps->ps_pc == (uintfptr_t) 0) /* no data */ 3719147191Sjkoshy break; 3720147191Sjkoshy 3721147191Sjkoshy pm = ps->ps_pmc; 3722147191Sjkoshy po = pm->pm_owner; 3723147191Sjkoshy 3724147191Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 3725147191Sjkoshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 3726147191Sjkoshy pm, PMC_TO_MODE(pm))); 3727147191Sjkoshy 3728147191Sjkoshy /* Ignore PMCs that have been switched off */ 3729147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 3730147191Sjkoshy goto entrydone; 3731147191Sjkoshy 3732147191Sjkoshy PMCDBG(SAM,OPS,1,"cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", cpu, 3733147708Sjkoshy pm, (uint64_t) ps->ps_pc, ps->ps_usermode, 3734147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 3735147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 3736147191Sjkoshy 3737147191Sjkoshy /* 3738147191Sjkoshy * If this is a process-mode PMC that is attached to 3739147191Sjkoshy * its owner, and if the PC is in user mode, update 3740147191Sjkoshy * profiling statistics like timer-based profiling 3741147191Sjkoshy * would have done. 3742147191Sjkoshy */ 3743147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 3744147191Sjkoshy if (ps->ps_usermode) { 3745147191Sjkoshy td = FIRST_THREAD_IN_PROC(po->po_owner); 3746147191Sjkoshy addupc_intr(td, ps->ps_pc, 1); 3747147191Sjkoshy } 3748147191Sjkoshy goto entrydone; 3749147191Sjkoshy } 3750147191Sjkoshy 3751147191Sjkoshy /* 3752147191Sjkoshy * Otherwise, this is either a sampling mode PMC that 3753147191Sjkoshy * is attached to a different process than its owner, 3754147191Sjkoshy * or a system-wide sampling PMC. Dispatch a log 3755147191Sjkoshy * entry to the PMC's owner process. 3756147191Sjkoshy */ 3757147191Sjkoshy 3758147191Sjkoshy pmclog_process_pcsample(pm, ps); 3759147191Sjkoshy 3760147191Sjkoshy entrydone: 3761147191Sjkoshy ps->ps_pc = (uintfptr_t) 0; /* mark entry as free */ 3762147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 3763147191Sjkoshy 3764147191Sjkoshy /* increment read pointer, modulo sample size */ 3765147191Sjkoshy if (++ps == psb->ps_fence) 3766147191Sjkoshy psb->ps_read = psb->ps_samples; 3767147191Sjkoshy else 3768147191Sjkoshy psb->ps_read = ps; 3769147191Sjkoshy } 3770147191Sjkoshy 3771147191Sjkoshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 3772147191Sjkoshy 3773147191Sjkoshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 3774147191Sjkoshy if (n == 0) 3775147191Sjkoshy return; 3776147191Sjkoshy 3777147191Sjkoshy /* 3778147191Sjkoshy * Restart any stalled sampling PMCs on this CPU. 3779147191Sjkoshy * 3780147867Sjkoshy * If the NMI handler sets the pm_stalled field of a PMC after 3781147867Sjkoshy * the check below, we'll end up processing the stalled PMC at 3782147867Sjkoshy * the next hardclock tick. 3783147191Sjkoshy */ 3784147191Sjkoshy for (n = 0; n < md->pmd_npmc; n++) { 3785147191Sjkoshy (void) (*md->pmd_get_config)(cpu,n,&pm); 3786147191Sjkoshy if (pm == NULL || /* !cfg'ed */ 3787147191Sjkoshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 3788147191Sjkoshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 3789147867Sjkoshy pm->pm_stalled == 0) /* !stalled */ 3790147191Sjkoshy continue; 3791147191Sjkoshy 3792147867Sjkoshy pm->pm_stalled = 0; 3793147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3794147191Sjkoshy (*md->pmd_start_pmc)(cpu, ri); 3795147191Sjkoshy } 3796145256Sjkoshy} 3797145256Sjkoshy 3798145256Sjkoshy/* 3799145256Sjkoshy * Event handlers. 3800145256Sjkoshy */ 3801145256Sjkoshy 3802145256Sjkoshy/* 3803145256Sjkoshy * Handle a process exit. 3804145256Sjkoshy * 3805147191Sjkoshy * Remove this process from all hash tables. If this process 3806147191Sjkoshy * owned any PMCs, turn off those PMCs and deallocate them, 3807147191Sjkoshy * removing any associations with target processes. 3808147191Sjkoshy * 3809147191Sjkoshy * This function will be called by the last 'thread' of a 3810147191Sjkoshy * process. 3811147191Sjkoshy * 3812145256Sjkoshy * XXX This eventhandler gets called early in the exit process. 3813145256Sjkoshy * Consider using a 'hook' invocation from thread_exit() or equivalent 3814145256Sjkoshy * spot. Another negative is that kse_exit doesn't seem to call 3815145256Sjkoshy * exit1() [??]. 3816147191Sjkoshy * 3817145256Sjkoshy */ 3818145256Sjkoshy 3819145256Sjkoshystatic void 3820145256Sjkoshypmc_process_exit(void *arg __unused, struct proc *p) 3821145256Sjkoshy{ 3822145256Sjkoshy int is_using_hwpmcs; 3823147191Sjkoshy int cpu; 3824147191Sjkoshy unsigned int ri; 3825147191Sjkoshy struct pmc *pm; 3826147191Sjkoshy struct pmc_process *pp; 3827147191Sjkoshy struct pmc_owner *po; 3828147191Sjkoshy pmc_value_t newvalue, tmp; 3829145256Sjkoshy 3830145256Sjkoshy PROC_LOCK(p); 3831145256Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 3832145256Sjkoshy PROC_UNLOCK(p); 3833145256Sjkoshy 3834147191Sjkoshy /* 3835147191Sjkoshy * Log a sysexit event to all SS PMC owners. 3836147191Sjkoshy */ 3837147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 3838147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 3839147191Sjkoshy pmclog_process_sysexit(po, p->p_pid); 3840145256Sjkoshy 3841147191Sjkoshy if (!is_using_hwpmcs) 3842147191Sjkoshy return; 3843147191Sjkoshy 3844147191Sjkoshy PMC_GET_SX_XLOCK(); 3845147191Sjkoshy PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 3846147191Sjkoshy p->p_comm); 3847147191Sjkoshy 3848147191Sjkoshy /* 3849147191Sjkoshy * Since this code is invoked by the last thread in an exiting 3850147191Sjkoshy * process, we would have context switched IN at some prior 3851147191Sjkoshy * point. However, with PREEMPTION, kernel mode context 3852147191Sjkoshy * switches may happen any time, so we want to disable a 3853147191Sjkoshy * context switch OUT till we get any PMCs targetting this 3854147191Sjkoshy * process off the hardware. 3855147191Sjkoshy * 3856147191Sjkoshy * We also need to atomically remove this process' 3857147191Sjkoshy * entry from our target process hash table, using 3858147191Sjkoshy * PMC_FLAG_REMOVE. 3859147191Sjkoshy */ 3860147191Sjkoshy PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 3861147191Sjkoshy p->p_comm); 3862147191Sjkoshy 3863147191Sjkoshy critical_enter(); /* no preemption */ 3864147191Sjkoshy 3865147191Sjkoshy cpu = curthread->td_oncpu; 3866147191Sjkoshy 3867147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, 3868147191Sjkoshy PMC_FLAG_REMOVE)) != NULL) { 3869147191Sjkoshy 3870147191Sjkoshy PMCDBG(PRC,EXT,2, 3871147191Sjkoshy "process-exit proc=%p pmc-process=%p", p, pp); 3872147191Sjkoshy 3873147191Sjkoshy /* 3874147191Sjkoshy * The exiting process could the target of 3875147191Sjkoshy * some PMCs which will be running on 3876147191Sjkoshy * currently executing CPU. 3877147191Sjkoshy * 3878147191Sjkoshy * We need to turn these PMCs off like we 3879147191Sjkoshy * would do at context switch OUT time. 3880147191Sjkoshy */ 3881147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 3882147191Sjkoshy 3883147191Sjkoshy /* 3884147191Sjkoshy * Pick up the pmc pointer from hardware 3885147191Sjkoshy * state similar to the CSW_OUT code. 3886147191Sjkoshy */ 3887147191Sjkoshy pm = NULL; 3888147191Sjkoshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 3889147191Sjkoshy 3890147191Sjkoshy PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 3891147191Sjkoshy 3892147191Sjkoshy if (pm == NULL || 3893147191Sjkoshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 3894147191Sjkoshy continue; 3895147191Sjkoshy 3896147191Sjkoshy PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 3897147191Sjkoshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 3898147191Sjkoshy pm, pm->pm_state); 3899147191Sjkoshy 3900147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 3901147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 3902147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 3903147191Sjkoshy 3904147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 3905147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 3906147191Sjkoshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 3907147191Sjkoshy 3908147191Sjkoshy (void) md->pmd_stop_pmc(cpu, ri); 3909147191Sjkoshy 3910147191Sjkoshy KASSERT(pm->pm_runcount > 0, 3911147191Sjkoshy ("[pmc,%d] bad runcount ri %d rc %d", 3912147191Sjkoshy __LINE__, ri, pm->pm_runcount)); 3913147191Sjkoshy 3914147867Sjkoshy /* Stop hardware only if it is actually running */ 3915147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3916147867Sjkoshy pm->pm_stalled == 0) { 3917147191Sjkoshy md->pmd_read_pmc(cpu, ri, &newvalue); 3918147191Sjkoshy tmp = newvalue - 3919147191Sjkoshy PMC_PCPU_SAVED(cpu,ri); 3920147191Sjkoshy 3921147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3922147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 3923147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 3924147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3925147191Sjkoshy } 3926147191Sjkoshy 3927147191Sjkoshy atomic_subtract_rel_32(&pm->pm_runcount,1); 3928147191Sjkoshy 3929147191Sjkoshy KASSERT((int) pm->pm_runcount >= 0, 3930147191Sjkoshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 3931147191Sjkoshy 3932147191Sjkoshy (void) md->pmd_config_pmc(cpu, ri, NULL); 3933147191Sjkoshy } 3934147191Sjkoshy 3935147191Sjkoshy /* 3936147191Sjkoshy * Inform the MD layer of this pseudo "context switch 3937147191Sjkoshy * out" 3938147191Sjkoshy */ 3939147191Sjkoshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 3940147191Sjkoshy 3941147191Sjkoshy critical_exit(); /* ok to be pre-empted now */ 3942147191Sjkoshy 3943147191Sjkoshy /* 3944147191Sjkoshy * Unlink this process from the PMCs that are 3945147191Sjkoshy * targetting it. This will send a signal to 3946147191Sjkoshy * all PMC owner's whose PMCs are orphaned. 3947147191Sjkoshy * 3948147191Sjkoshy * Log PMC value at exit time if requested. 3949147191Sjkoshy */ 3950147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 3951147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 3952147867Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 3953147867Sjkoshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 3954147191Sjkoshy pmclog_process_procexit(pm, pp); 3955147191Sjkoshy pmc_unlink_target_process(pm, pp); 3956147191Sjkoshy } 3957147191Sjkoshy FREE(pp, M_PMC); 3958147191Sjkoshy 3959147191Sjkoshy } else 3960147191Sjkoshy critical_exit(); /* pp == NULL */ 3961147191Sjkoshy 3962147191Sjkoshy 3963147191Sjkoshy /* 3964147191Sjkoshy * If the process owned PMCs, free them up and free up 3965147191Sjkoshy * memory. 3966147191Sjkoshy */ 3967147191Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 3968147191Sjkoshy pmc_remove_owner(po); 3969147191Sjkoshy pmc_destroy_owner_descriptor(po); 3970145256Sjkoshy } 3971147191Sjkoshy 3972147191Sjkoshy sx_xunlock(&pmc_sx); 3973145256Sjkoshy} 3974145256Sjkoshy 3975145256Sjkoshy/* 3976145256Sjkoshy * Handle a process fork. 3977145256Sjkoshy * 3978145256Sjkoshy * If the parent process 'p1' is under HWPMC monitoring, then copy 3979145256Sjkoshy * over any attached PMCs that have 'do_descendants' semantics. 3980145256Sjkoshy */ 3981145256Sjkoshy 3982145256Sjkoshystatic void 3983147191Sjkoshypmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 3984145256Sjkoshy int flags) 3985145256Sjkoshy{ 3986145256Sjkoshy int is_using_hwpmcs; 3987147191Sjkoshy unsigned int ri; 3988147191Sjkoshy uint32_t do_descendants; 3989147191Sjkoshy struct pmc *pm; 3990147191Sjkoshy struct pmc_owner *po; 3991147191Sjkoshy struct pmc_process *ppnew, *ppold; 3992145256Sjkoshy 3993145256Sjkoshy (void) flags; /* unused parameter */ 3994145256Sjkoshy 3995145256Sjkoshy PROC_LOCK(p1); 3996145256Sjkoshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 3997145256Sjkoshy PROC_UNLOCK(p1); 3998145256Sjkoshy 3999147191Sjkoshy /* 4000147191Sjkoshy * If there are system-wide sampling PMCs active, we need to 4001147191Sjkoshy * log all fork events to their owner's logs. 4002147191Sjkoshy */ 4003147191Sjkoshy 4004147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4005147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4006147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 4007147191Sjkoshy 4008147191Sjkoshy if (!is_using_hwpmcs) 4009147191Sjkoshy return; 4010147191Sjkoshy 4011147191Sjkoshy PMC_GET_SX_XLOCK(); 4012147191Sjkoshy PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 4013147191Sjkoshy p1->p_pid, p1->p_comm, newproc); 4014147191Sjkoshy 4015147191Sjkoshy /* 4016147191Sjkoshy * If the parent process (curthread->td_proc) is a 4017147191Sjkoshy * target of any PMCs, look for PMCs that are to be 4018147191Sjkoshy * inherited, and link these into the new process 4019147191Sjkoshy * descriptor. 4020147191Sjkoshy */ 4021147191Sjkoshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 4022147191Sjkoshy PMC_FLAG_NONE)) == NULL) 4023147191Sjkoshy goto done; /* nothing to do */ 4024147191Sjkoshy 4025147191Sjkoshy do_descendants = 0; 4026147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4027147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 4028147191Sjkoshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 4029147191Sjkoshy if (do_descendants == 0) /* nothing to do */ 4030147191Sjkoshy goto done; 4031147191Sjkoshy 4032147191Sjkoshy /* allocate a descriptor for the new process */ 4033147191Sjkoshy if ((ppnew = pmc_find_process_descriptor(newproc, 4034147191Sjkoshy PMC_FLAG_ALLOCATE)) == NULL) 4035147191Sjkoshy goto done; 4036147191Sjkoshy 4037147191Sjkoshy /* 4038147191Sjkoshy * Run through all PMCs that were targeting the old process 4039147191Sjkoshy * and which specified F_DESCENDANTS and attach them to the 4040147191Sjkoshy * new process. 4041147191Sjkoshy * 4042147191Sjkoshy * Log the fork event to all owners of PMCs attached to this 4043147191Sjkoshy * process, if not already logged. 4044147191Sjkoshy */ 4045147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4046147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 4047147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 4048147191Sjkoshy pmc_link_target_process(pm, ppnew); 4049147191Sjkoshy po = pm->pm_owner; 4050147191Sjkoshy if (po->po_sscount == 0 && 4051147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 4052147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, 4053147191Sjkoshy newproc->p_pid); 4054147191Sjkoshy } 4055147191Sjkoshy 4056147191Sjkoshy /* 4057147191Sjkoshy * Now mark the new process as being tracked by this driver. 4058147191Sjkoshy */ 4059147191Sjkoshy PROC_LOCK(newproc); 4060147191Sjkoshy newproc->p_flag |= P_HWPMC; 4061147191Sjkoshy PROC_UNLOCK(newproc); 4062147191Sjkoshy 4063147191Sjkoshy done: 4064147191Sjkoshy sx_xunlock(&pmc_sx); 4065145256Sjkoshy} 4066145256Sjkoshy 4067145256Sjkoshy 4068145256Sjkoshy/* 4069145256Sjkoshy * initialization 4070145256Sjkoshy */ 4071145256Sjkoshy 4072145256Sjkoshystatic const char *pmc_name_of_pmcclass[] = { 4073145256Sjkoshy#undef __PMC_CLASS 4074145256Sjkoshy#define __PMC_CLASS(N) #N , 4075145256Sjkoshy __PMC_CLASSES() 4076145256Sjkoshy}; 4077145256Sjkoshy 4078145256Sjkoshystatic int 4079145256Sjkoshypmc_initialize(void) 4080145256Sjkoshy{ 4081147191Sjkoshy int cpu, error, n; 4082145256Sjkoshy struct pmc_binding pb; 4083147191Sjkoshy struct pmc_samplebuffer *sb; 4084145256Sjkoshy 4085145256Sjkoshy md = NULL; 4086145256Sjkoshy error = 0; 4087145256Sjkoshy 4088153110Sru#ifdef DEBUG 4089145256Sjkoshy /* parse debug flags first */ 4090145256Sjkoshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 4091145256Sjkoshy pmc_debugstr, sizeof(pmc_debugstr))) 4092145256Sjkoshy pmc_debugflags_parse(pmc_debugstr, 4093145256Sjkoshy pmc_debugstr+strlen(pmc_debugstr)); 4094145256Sjkoshy#endif 4095145256Sjkoshy 4096145256Sjkoshy PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 4097145256Sjkoshy 4098148562Sjkoshy /* check kernel version */ 4099148562Sjkoshy if (pmc_kernel_version != PMC_VERSION) { 4100148562Sjkoshy if (pmc_kernel_version == 0) 4101148562Sjkoshy printf("hwpmc: this kernel has not been compiled with " 4102148562Sjkoshy "'options HWPMC_HOOKS'.\n"); 4103148562Sjkoshy else 4104148562Sjkoshy printf("hwpmc: kernel version (0x%x) does not match " 4105148562Sjkoshy "module version (0x%x).\n", pmc_kernel_version, 4106148562Sjkoshy PMC_VERSION); 4107148562Sjkoshy return EPROGMISMATCH; 4108148562Sjkoshy } 4109148562Sjkoshy 4110145256Sjkoshy /* 4111145256Sjkoshy * check sysctl parameters 4112145256Sjkoshy */ 4113145256Sjkoshy 4114145256Sjkoshy if (pmc_hashsize <= 0) { 4115147191Sjkoshy (void) printf("hwpmc: tunable hashsize=%d must be greater " 4116147191Sjkoshy "than zero.\n", pmc_hashsize); 4117145256Sjkoshy pmc_hashsize = PMC_HASH_SIZE; 4118145256Sjkoshy } 4119145256Sjkoshy 4120147191Sjkoshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 4121153735Sjkoshy (void) printf("hwpmc: tunable nsamples=%d out of range.\n", 4122153735Sjkoshy pmc_nsamples); 4123147191Sjkoshy pmc_nsamples = PMC_NSAMPLES; 4124147191Sjkoshy } 4125145256Sjkoshy 4126147191Sjkoshy md = pmc_md_initialize(); 4127147191Sjkoshy 4128145256Sjkoshy if (md == NULL || md->pmd_init == NULL) 4129145256Sjkoshy return ENOSYS; 4130145256Sjkoshy 4131145256Sjkoshy /* allocate space for the per-cpu array */ 4132145256Sjkoshy MALLOC(pmc_pcpu, struct pmc_cpu **, mp_ncpus * sizeof(struct pmc_cpu *), 4133145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4134145256Sjkoshy 4135145256Sjkoshy /* per-cpu 'saved values' for managing process-mode PMCs */ 4136145256Sjkoshy MALLOC(pmc_pcpu_saved, pmc_value_t *, 4137145256Sjkoshy sizeof(pmc_value_t) * mp_ncpus * md->pmd_npmc, M_PMC, M_WAITOK); 4138145256Sjkoshy 4139145256Sjkoshy /* perform cpu dependent initialization */ 4140145256Sjkoshy pmc_save_cpu_binding(&pb); 4141145256Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4142145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4143145256Sjkoshy continue; 4144145256Sjkoshy pmc_select_cpu(cpu); 4145145256Sjkoshy if ((error = md->pmd_init(cpu)) != 0) 4146145256Sjkoshy break; 4147145256Sjkoshy } 4148145256Sjkoshy pmc_restore_cpu_binding(&pb); 4149145256Sjkoshy 4150145256Sjkoshy if (error != 0) 4151145256Sjkoshy return error; 4152145256Sjkoshy 4153147191Sjkoshy /* allocate space for the sample array */ 4154147191Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4155147191Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4156147191Sjkoshy continue; 4157147191Sjkoshy MALLOC(sb, struct pmc_samplebuffer *, 4158147191Sjkoshy sizeof(struct pmc_samplebuffer) + 4159147191Sjkoshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4160147191Sjkoshy M_WAITOK|M_ZERO); 4161147191Sjkoshy 4162147191Sjkoshy sb->ps_read = sb->ps_write = sb->ps_samples; 4163153735Sjkoshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4164147191Sjkoshy KASSERT(pmc_pcpu[cpu] != NULL, 4165147191Sjkoshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4166147191Sjkoshy 4167147191Sjkoshy pmc_pcpu[cpu]->pc_sb = sb; 4168147191Sjkoshy } 4169147191Sjkoshy 4170145256Sjkoshy /* allocate space for the row disposition array */ 4171145256Sjkoshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 4172145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4173145256Sjkoshy 4174145256Sjkoshy KASSERT(pmc_pmcdisp != NULL, 4175145256Sjkoshy ("[pmc,%d] pmcdisp allocation returned NULL", __LINE__)); 4176145256Sjkoshy 4177145256Sjkoshy /* mark all PMCs as available */ 4178145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 4179145256Sjkoshy PMC_MARK_ROW_FREE(n); 4180145256Sjkoshy 4181145256Sjkoshy /* allocate thread hash tables */ 4182145256Sjkoshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 4183145256Sjkoshy &pmc_ownerhashmask); 4184145256Sjkoshy 4185145256Sjkoshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 4186145256Sjkoshy &pmc_processhashmask); 4187145256Sjkoshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc", MTX_SPIN); 4188145256Sjkoshy 4189147191Sjkoshy LIST_INIT(&pmc_ss_owners); 4190147191Sjkoshy pmc_ss_count = 0; 4191147191Sjkoshy 4192145256Sjkoshy /* allocate a pool of spin mutexes */ 4193145256Sjkoshy pmc_mtxpool = mtx_pool_create("pmc", pmc_mtxpool_size, MTX_SPIN); 4194145256Sjkoshy 4195145256Sjkoshy PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4196145256Sjkoshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4197145256Sjkoshy pmc_processhash, pmc_processhashmask); 4198145256Sjkoshy 4199145256Sjkoshy /* register process {exit,fork,exec} handlers */ 4200145256Sjkoshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4201145256Sjkoshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4202145256Sjkoshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4203145256Sjkoshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4204145256Sjkoshy 4205147191Sjkoshy /* initialize logging */ 4206147191Sjkoshy pmclog_initialize(); 4207147191Sjkoshy 4208145256Sjkoshy /* set hook functions */ 4209145256Sjkoshy pmc_intr = md->pmd_intr; 4210145256Sjkoshy pmc_hook = pmc_hook_handler; 4211145256Sjkoshy 4212145256Sjkoshy if (error == 0) { 4213145256Sjkoshy printf(PMC_MODULE_NAME ":"); 4214149373Sjkoshy for (n = 0; n < (int) md->pmd_nclass; n++) { 4215149373Sjkoshy printf(" %s/%d/0x%b", 4216145774Sjkoshy pmc_name_of_pmcclass[md->pmd_classes[n].pm_class], 4217149373Sjkoshy md->pmd_nclasspmcs[n], 4218149373Sjkoshy md->pmd_classes[n].pm_caps, 4219149373Sjkoshy "\20" 4220149373Sjkoshy "\1INT\2USR\3SYS\4EDG\5THR" 4221149373Sjkoshy "\6REA\7WRI\10INV\11QUA\12PRC" 4222149373Sjkoshy "\13TAG\14CSC"); 4223149373Sjkoshy } 4224145256Sjkoshy printf("\n"); 4225145256Sjkoshy } 4226145256Sjkoshy 4227145256Sjkoshy return error; 4228145256Sjkoshy} 4229145256Sjkoshy 4230145256Sjkoshy/* prepare to be unloaded */ 4231145256Sjkoshystatic void 4232145256Sjkoshypmc_cleanup(void) 4233145256Sjkoshy{ 4234145256Sjkoshy int cpu; 4235145256Sjkoshy struct pmc_ownerhash *ph; 4236145256Sjkoshy struct pmc_owner *po, *tmp; 4237145256Sjkoshy struct pmc_binding pb; 4238153110Sru#ifdef DEBUG 4239145256Sjkoshy struct pmc_processhash *prh; 4240145256Sjkoshy#endif 4241145256Sjkoshy 4242145256Sjkoshy PMCDBG(MOD,INI,0, "%s", "cleanup"); 4243145256Sjkoshy 4244147191Sjkoshy /* switch off sampling */ 4245147191Sjkoshy atomic_store_rel_int(&pmc_cpumask, 0); 4246147191Sjkoshy pmc_intr = NULL; 4247145256Sjkoshy 4248145256Sjkoshy sx_xlock(&pmc_sx); 4249145256Sjkoshy if (pmc_hook == NULL) { /* being unloaded already */ 4250145256Sjkoshy sx_xunlock(&pmc_sx); 4251145256Sjkoshy return; 4252145256Sjkoshy } 4253145256Sjkoshy 4254145256Sjkoshy pmc_hook = NULL; /* prevent new threads from entering module */ 4255145256Sjkoshy 4256145256Sjkoshy /* deregister event handlers */ 4257145256Sjkoshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 4258145256Sjkoshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 4259145256Sjkoshy 4260145256Sjkoshy /* send SIGBUS to all owner threads, free up allocations */ 4261145256Sjkoshy if (pmc_ownerhash) 4262145256Sjkoshy for (ph = pmc_ownerhash; 4263145256Sjkoshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 4264145256Sjkoshy ph++) { 4265145256Sjkoshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 4266145256Sjkoshy pmc_remove_owner(po); 4267145256Sjkoshy 4268145256Sjkoshy /* send SIGBUS to owner processes */ 4269145256Sjkoshy PMCDBG(MOD,INI,2, "cleanup signal proc=%p " 4270145256Sjkoshy "(%d, %s)", po->po_owner, 4271145256Sjkoshy po->po_owner->p_pid, 4272145256Sjkoshy po->po_owner->p_comm); 4273145256Sjkoshy 4274145256Sjkoshy PROC_LOCK(po->po_owner); 4275145256Sjkoshy psignal(po->po_owner, SIGBUS); 4276145256Sjkoshy PROC_UNLOCK(po->po_owner); 4277147191Sjkoshy 4278147191Sjkoshy pmc_destroy_owner_descriptor(po); 4279145256Sjkoshy } 4280145256Sjkoshy } 4281145256Sjkoshy 4282145256Sjkoshy /* reclaim allocated data structures */ 4283145256Sjkoshy if (pmc_mtxpool) 4284145256Sjkoshy mtx_pool_destroy(&pmc_mtxpool); 4285145256Sjkoshy 4286145256Sjkoshy mtx_destroy(&pmc_processhash_mtx); 4287145256Sjkoshy if (pmc_processhash) { 4288153110Sru#ifdef DEBUG 4289145256Sjkoshy struct pmc_process *pp; 4290145256Sjkoshy 4291145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy process hash"); 4292145256Sjkoshy for (prh = pmc_processhash; 4293145256Sjkoshy prh <= &pmc_processhash[pmc_processhashmask]; 4294145256Sjkoshy prh++) 4295145256Sjkoshy LIST_FOREACH(pp, prh, pp_next) 4296145256Sjkoshy PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 4297145256Sjkoshy#endif 4298145256Sjkoshy 4299145256Sjkoshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 4300145256Sjkoshy pmc_processhash = NULL; 4301145256Sjkoshy } 4302145256Sjkoshy 4303145256Sjkoshy if (pmc_ownerhash) { 4304145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy owner hash"); 4305145256Sjkoshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 4306145256Sjkoshy pmc_ownerhash = NULL; 4307145256Sjkoshy } 4308145256Sjkoshy 4309147191Sjkoshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 4310147191Sjkoshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 4311147191Sjkoshy KASSERT(pmc_ss_count == 0, 4312147191Sjkoshy ("[pmc,%d] Global SS count not empty", __LINE__)); 4313147191Sjkoshy 4314153735Sjkoshy /* free the per-cpu sample buffers */ 4315153735Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4316153735Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4317153735Sjkoshy continue; 4318153735Sjkoshy KASSERT(pmc_pcpu[cpu]->pc_sb != NULL, 4319153735Sjkoshy ("[pmc,%d] Null cpu sample buffer cpu=%d", __LINE__, 4320153735Sjkoshy cpu)); 4321153735Sjkoshy FREE(pmc_pcpu[cpu]->pc_sb, M_PMC); 4322153735Sjkoshy pmc_pcpu[cpu]->pc_sb = NULL; 4323153735Sjkoshy } 4324153735Sjkoshy 4325145256Sjkoshy /* do processor dependent cleanup */ 4326145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "md cleanup"); 4327145256Sjkoshy if (md) { 4328145256Sjkoshy pmc_save_cpu_binding(&pb); 4329145256Sjkoshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4330145256Sjkoshy PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 4331145256Sjkoshy cpu, pmc_pcpu[cpu]); 4332145256Sjkoshy if (pmc_cpu_is_disabled(cpu)) 4333145256Sjkoshy continue; 4334145256Sjkoshy pmc_select_cpu(cpu); 4335145256Sjkoshy if (pmc_pcpu[cpu]) 4336145256Sjkoshy (void) md->pmd_cleanup(cpu); 4337145256Sjkoshy } 4338145256Sjkoshy FREE(md, M_PMC); 4339145256Sjkoshy md = NULL; 4340145256Sjkoshy pmc_restore_cpu_binding(&pb); 4341145256Sjkoshy } 4342145256Sjkoshy 4343145256Sjkoshy /* deallocate per-cpu structures */ 4344145256Sjkoshy FREE(pmc_pcpu, M_PMC); 4345145256Sjkoshy pmc_pcpu = NULL; 4346145256Sjkoshy 4347145256Sjkoshy FREE(pmc_pcpu_saved, M_PMC); 4348145256Sjkoshy pmc_pcpu_saved = NULL; 4349145256Sjkoshy 4350145256Sjkoshy if (pmc_pmcdisp) { 4351145256Sjkoshy FREE(pmc_pmcdisp, M_PMC); 4352145256Sjkoshy pmc_pmcdisp = NULL; 4353145256Sjkoshy } 4354145256Sjkoshy 4355147191Sjkoshy pmclog_shutdown(); 4356147191Sjkoshy 4357145256Sjkoshy sx_xunlock(&pmc_sx); /* we are done */ 4358145256Sjkoshy} 4359145256Sjkoshy 4360145256Sjkoshy/* 4361145256Sjkoshy * The function called at load/unload. 4362145256Sjkoshy */ 4363145256Sjkoshy 4364145256Sjkoshystatic int 4365145256Sjkoshyload (struct module *module __unused, int cmd, void *arg __unused) 4366145256Sjkoshy{ 4367145256Sjkoshy int error; 4368145256Sjkoshy 4369145256Sjkoshy error = 0; 4370145256Sjkoshy 4371145256Sjkoshy switch (cmd) { 4372145256Sjkoshy case MOD_LOAD : 4373145256Sjkoshy /* initialize the subsystem */ 4374145256Sjkoshy error = pmc_initialize(); 4375145256Sjkoshy if (error != 0) 4376145256Sjkoshy break; 4377145256Sjkoshy PMCDBG(MOD,INI,1, "syscall=%d ncpus=%d", 4378145256Sjkoshy pmc_syscall_num, mp_ncpus); 4379145256Sjkoshy break; 4380145256Sjkoshy 4381145256Sjkoshy 4382145256Sjkoshy case MOD_UNLOAD : 4383145256Sjkoshy case MOD_SHUTDOWN: 4384145256Sjkoshy pmc_cleanup(); 4385145256Sjkoshy PMCDBG(MOD,INI,1, "%s", "unloaded"); 4386145256Sjkoshy break; 4387145256Sjkoshy 4388145256Sjkoshy default : 4389145256Sjkoshy error = EINVAL; /* XXX should panic(9) */ 4390145256Sjkoshy break; 4391145256Sjkoshy } 4392145256Sjkoshy 4393145256Sjkoshy return error; 4394145256Sjkoshy} 4395145256Sjkoshy 4396145256Sjkoshy/* memory pool */ 4397145256SjkoshyMALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 4398