kern_cpu.c revision 1.62
1 /* $NetBSD: kern_cpu.c,v 1.62 2013/12/19 23:36:07 mlelstv Exp $ */ 2 3 /*- 4 * Copyright (c) 2007, 2008, 2009, 2010, 2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c)2007 YAMAMOTO Takashi, 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58 #include <sys/cdefs.h> 59 __KERNEL_RCSID(0, "$NetBSD: kern_cpu.c,v 1.62 2013/12/19 23:36:07 mlelstv Exp $"); 60 61 #include "opt_cpu_ucode.h" 62 #include "opt_compat_netbsd.h" 63 64 #include <sys/param.h> 65 #include <sys/systm.h> 66 #include <sys/idle.h> 67 #include <sys/sched.h> 68 #include <sys/intr.h> 69 #include <sys/conf.h> 70 #include <sys/cpu.h> 71 #include <sys/cpuio.h> 72 #include <sys/proc.h> 73 #include <sys/percpu.h> 74 #include <sys/kernel.h> 75 #include <sys/kauth.h> 76 #include <sys/xcall.h> 77 #include <sys/pool.h> 78 #include <sys/kmem.h> 79 #include <sys/select.h> 80 #include <sys/namei.h> 81 #include <sys/callout.h> 82 #include <sys/pcu.h> 83 84 #include <uvm/uvm_extern.h> 85 86 /* 87 * If the port has stated that cpu_data is the first thing in cpu_info, 88 * verify that the claim is true. This will prevent them from getting out 89 * of sync. 90 */ 91 #ifdef __HAVE_CPU_DATA_FIRST 92 CTASSERT(offsetof(struct cpu_info, ci_data) == 0); 93 #else 94 CTASSERT(offsetof(struct cpu_info, ci_data) != 0); 95 #endif 96 97 void cpuctlattach(int); 98 99 static void cpu_xc_online(struct cpu_info *); 100 static void cpu_xc_offline(struct cpu_info *); 101 102 dev_type_ioctl(cpuctl_ioctl); 103 104 const struct cdevsw cpuctl_cdevsw = { 105 nullopen, nullclose, nullread, nullwrite, cpuctl_ioctl, 106 nullstop, notty, nopoll, nommap, nokqfilter, 107 D_OTHER | D_MPSAFE 108 }; 109 110 kmutex_t cpu_lock __cacheline_aligned; 111 int ncpu __read_mostly; 112 int ncpuonline __read_mostly; 113 bool mp_online __read_mostly; 114 115 /* An array of CPUs. There are ncpu entries. */ 116 struct cpu_info **cpu_infos __read_mostly; 117 118 /* Note: set on mi_cpu_attach() and idle_loop(). */ 119 kcpuset_t * kcpuset_attached __read_mostly = NULL; 120 kcpuset_t * kcpuset_running __read_mostly = NULL; 121 122 /* 123 * mi_cpu_init: early initialisation of MI CPU related structures. 124 * 125 * Note: may not block and memory allocator is not yet available. 126 */ 127 void 128 mi_cpu_init(void) 129 { 130 131 mutex_init(&cpu_lock, MUTEX_DEFAULT, IPL_NONE); 132 133 kcpuset_create(&kcpuset_attached, true); 134 kcpuset_create(&kcpuset_running, true); 135 kcpuset_set(kcpuset_running, 0); 136 } 137 138 int 139 mi_cpu_attach(struct cpu_info *ci) 140 { 141 int error; 142 143 KASSERT(maxcpus > 0); 144 145 ci->ci_index = ncpu; 146 kcpuset_set(kcpuset_attached, cpu_index(ci)); 147 148 /* 149 * Create a convenience cpuset of just ourselves. 150 */ 151 kcpuset_create(&ci->ci_data.cpu_kcpuset, true); 152 kcpuset_set(ci->ci_data.cpu_kcpuset, cpu_index(ci)); 153 154 TAILQ_INIT(&ci->ci_data.cpu_ld_locks); 155 __cpu_simple_lock_init(&ci->ci_data.cpu_ld_lock); 156 157 /* This is useful for eg, per-cpu evcnt */ 158 snprintf(ci->ci_data.cpu_name, sizeof(ci->ci_data.cpu_name), "cpu%d", 159 cpu_index(ci)); 160 161 if (__predict_false(cpu_infos == NULL)) { 162 size_t ci_bufsize = (maxcpus + 1) * sizeof(struct cpu_info *); 163 cpu_infos = kmem_zalloc(ci_bufsize, KM_SLEEP); 164 } 165 cpu_infos[cpu_index(ci)] = ci; 166 167 sched_cpuattach(ci); 168 169 error = create_idle_lwp(ci); 170 if (error != 0) { 171 /* XXX revert sched_cpuattach */ 172 return error; 173 } 174 175 if (ci == curcpu()) 176 ci->ci_data.cpu_onproc = curlwp; 177 else 178 ci->ci_data.cpu_onproc = ci->ci_data.cpu_idlelwp; 179 180 percpu_init_cpu(ci); 181 softint_init(ci); 182 callout_init_cpu(ci); 183 xc_init_cpu(ci); 184 pool_cache_cpu_init(ci); 185 selsysinit(ci); 186 cache_cpu_init(ci); 187 TAILQ_INIT(&ci->ci_data.cpu_biodone); 188 ncpu++; 189 ncpuonline++; 190 191 return 0; 192 } 193 194 void 195 cpuctlattach(int dummy) 196 { 197 198 KASSERT(cpu_infos != NULL); 199 } 200 201 int 202 cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 203 { 204 CPU_INFO_ITERATOR cii; 205 cpustate_t *cs; 206 struct cpu_info *ci; 207 int error, i; 208 u_int id; 209 210 error = 0; 211 212 mutex_enter(&cpu_lock); 213 switch (cmd) { 214 case IOC_CPU_SETSTATE: 215 cs = data; 216 error = kauth_authorize_system(l->l_cred, 217 KAUTH_SYSTEM_CPU, KAUTH_REQ_SYSTEM_CPU_SETSTATE, cs, NULL, 218 NULL); 219 if (error != 0) 220 break; 221 if (cs->cs_id >= maxcpus || 222 (ci = cpu_lookup(cs->cs_id)) == NULL) { 223 error = ESRCH; 224 break; 225 } 226 cpu_setintr(ci, cs->cs_intr); 227 error = cpu_setstate(ci, cs->cs_online); 228 break; 229 230 case IOC_CPU_GETSTATE: 231 cs = data; 232 id = cs->cs_id; 233 memset(cs, 0, sizeof(*cs)); 234 cs->cs_id = id; 235 if (cs->cs_id >= maxcpus || 236 (ci = cpu_lookup(id)) == NULL) { 237 error = ESRCH; 238 break; 239 } 240 if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 241 cs->cs_online = false; 242 else 243 cs->cs_online = true; 244 if ((ci->ci_schedstate.spc_flags & SPCF_NOINTR) != 0) 245 cs->cs_intr = false; 246 else 247 cs->cs_intr = true; 248 cs->cs_lastmod = (int32_t)ci->ci_schedstate.spc_lastmod; 249 cs->cs_lastmodhi = (int32_t) 250 (ci->ci_schedstate.spc_lastmod >> 32); 251 cs->cs_intrcnt = cpu_intr_count(ci) + 1; 252 cs->cs_hwid = ci->ci_cpuid; 253 break; 254 255 case IOC_CPU_MAPID: 256 i = 0; 257 for (CPU_INFO_FOREACH(cii, ci)) { 258 if (i++ == *(int *)data) 259 break; 260 } 261 if (ci == NULL) 262 error = ESRCH; 263 else 264 *(int *)data = cpu_index(ci); 265 break; 266 267 case IOC_CPU_GETCOUNT: 268 *(int *)data = ncpu; 269 break; 270 271 #ifdef CPU_UCODE 272 case IOC_CPU_UCODE_GET_VERSION: 273 error = cpu_ucode_get_version((struct cpu_ucode_version *)data); 274 break; 275 276 #ifdef COMPAT_60 277 case OIOC_CPU_UCODE_GET_VERSION: 278 error = compat6_cpu_ucode_get_version((struct compat6_cpu_ucode *)data); 279 break; 280 #endif 281 282 case IOC_CPU_UCODE_APPLY: 283 error = kauth_authorize_machdep(l->l_cred, 284 KAUTH_MACHDEP_CPU_UCODE_APPLY, 285 NULL, NULL, NULL, NULL); 286 if (error != 0) 287 break; 288 error = cpu_ucode_apply((const struct cpu_ucode *)data); 289 break; 290 291 #ifdef COMPAT_60 292 case OIOC_CPU_UCODE_APPLY: 293 error = kauth_authorize_machdep(l->l_cred, 294 KAUTH_MACHDEP_CPU_UCODE_APPLY, 295 NULL, NULL, NULL, NULL); 296 if (error != 0) 297 break; 298 error = compat6_cpu_ucode_apply((const struct compat6_cpu_ucode *)data); 299 break; 300 #endif 301 #endif 302 303 default: 304 error = ENOTTY; 305 break; 306 } 307 mutex_exit(&cpu_lock); 308 309 return error; 310 } 311 312 struct cpu_info * 313 cpu_lookup(u_int idx) 314 { 315 struct cpu_info *ci; 316 317 KASSERT(idx < maxcpus); 318 319 if (__predict_false(cpu_infos == NULL)) { 320 KASSERT(idx == 0); 321 return curcpu(); 322 } 323 324 ci = cpu_infos[idx]; 325 KASSERT(ci == NULL || cpu_index(ci) == idx); 326 327 return ci; 328 } 329 330 static void 331 cpu_xc_offline(struct cpu_info *ci) 332 { 333 struct schedstate_percpu *spc, *mspc = NULL; 334 struct cpu_info *target_ci; 335 struct lwp *l; 336 CPU_INFO_ITERATOR cii; 337 int s; 338 339 /* 340 * Thread that made the cross call (separate context) holds 341 * cpu_lock on our behalf. 342 */ 343 spc = &ci->ci_schedstate; 344 s = splsched(); 345 spc->spc_flags |= SPCF_OFFLINE; 346 splx(s); 347 348 /* Take the first available CPU for the migration. */ 349 for (CPU_INFO_FOREACH(cii, target_ci)) { 350 mspc = &target_ci->ci_schedstate; 351 if ((mspc->spc_flags & SPCF_OFFLINE) == 0) 352 break; 353 } 354 KASSERT(target_ci != NULL); 355 356 /* 357 * Migrate all non-bound threads to the other CPU. Note that this 358 * runs from the xcall thread, thus handling of LSONPROC is not needed. 359 */ 360 mutex_enter(proc_lock); 361 LIST_FOREACH(l, &alllwp, l_list) { 362 struct cpu_info *mci; 363 364 lwp_lock(l); 365 if (l->l_cpu != ci || (l->l_pflag & (LP_BOUND | LP_INTR))) { 366 lwp_unlock(l); 367 continue; 368 } 369 /* Regular case - no affinity. */ 370 if (l->l_affinity == NULL) { 371 lwp_migrate(l, target_ci); 372 continue; 373 } 374 /* Affinity is set, find an online CPU in the set. */ 375 for (CPU_INFO_FOREACH(cii, mci)) { 376 mspc = &mci->ci_schedstate; 377 if ((mspc->spc_flags & SPCF_OFFLINE) == 0 && 378 kcpuset_isset(l->l_affinity, cpu_index(mci))) 379 break; 380 } 381 if (mci == NULL) { 382 lwp_unlock(l); 383 mutex_exit(proc_lock); 384 goto fail; 385 } 386 lwp_migrate(l, mci); 387 } 388 mutex_exit(proc_lock); 389 390 #if PCU_UNIT_COUNT > 0 391 pcu_save_all_on_cpu(); 392 #endif 393 394 #ifdef __HAVE_MD_CPU_OFFLINE 395 cpu_offline_md(); 396 #endif 397 return; 398 fail: 399 /* Just unset the SPCF_OFFLINE flag, caller will check */ 400 s = splsched(); 401 spc->spc_flags &= ~SPCF_OFFLINE; 402 splx(s); 403 } 404 405 static void 406 cpu_xc_online(struct cpu_info *ci) 407 { 408 struct schedstate_percpu *spc; 409 int s; 410 411 spc = &ci->ci_schedstate; 412 s = splsched(); 413 spc->spc_flags &= ~SPCF_OFFLINE; 414 splx(s); 415 } 416 417 int 418 cpu_setstate(struct cpu_info *ci, bool online) 419 { 420 struct schedstate_percpu *spc; 421 CPU_INFO_ITERATOR cii; 422 struct cpu_info *ci2; 423 uint64_t where; 424 xcfunc_t func; 425 int nonline; 426 427 spc = &ci->ci_schedstate; 428 429 KASSERT(mutex_owned(&cpu_lock)); 430 431 if (online) { 432 if ((spc->spc_flags & SPCF_OFFLINE) == 0) 433 return 0; 434 func = (xcfunc_t)cpu_xc_online; 435 ncpuonline++; 436 } else { 437 if ((spc->spc_flags & SPCF_OFFLINE) != 0) 438 return 0; 439 nonline = 0; 440 /* 441 * Ensure that at least one CPU within the processor set 442 * stays online. Revisit this later. 443 */ 444 for (CPU_INFO_FOREACH(cii, ci2)) { 445 if ((ci2->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 446 continue; 447 if (ci2->ci_schedstate.spc_psid != spc->spc_psid) 448 continue; 449 nonline++; 450 } 451 if (nonline == 1) 452 return EBUSY; 453 func = (xcfunc_t)cpu_xc_offline; 454 ncpuonline--; 455 } 456 457 where = xc_unicast(0, func, ci, NULL, ci); 458 xc_wait(where); 459 if (online) { 460 KASSERT((spc->spc_flags & SPCF_OFFLINE) == 0); 461 } else if ((spc->spc_flags & SPCF_OFFLINE) == 0) { 462 /* If was not set offline, then it is busy */ 463 return EBUSY; 464 } 465 466 spc->spc_lastmod = time_second; 467 return 0; 468 } 469 470 #ifdef __HAVE_INTR_CONTROL 471 static void 472 cpu_xc_intr(struct cpu_info *ci) 473 { 474 struct schedstate_percpu *spc; 475 int s; 476 477 spc = &ci->ci_schedstate; 478 s = splsched(); 479 spc->spc_flags &= ~SPCF_NOINTR; 480 splx(s); 481 } 482 483 static void 484 cpu_xc_nointr(struct cpu_info *ci) 485 { 486 struct schedstate_percpu *spc; 487 int s; 488 489 spc = &ci->ci_schedstate; 490 s = splsched(); 491 spc->spc_flags |= SPCF_NOINTR; 492 splx(s); 493 } 494 495 int 496 cpu_setintr(struct cpu_info *ci, bool intr) 497 { 498 struct schedstate_percpu *spc; 499 CPU_INFO_ITERATOR cii; 500 struct cpu_info *ci2; 501 uint64_t where; 502 xcfunc_t func; 503 int nintr; 504 505 spc = &ci->ci_schedstate; 506 507 KASSERT(mutex_owned(&cpu_lock)); 508 509 if (intr) { 510 if ((spc->spc_flags & SPCF_NOINTR) == 0) 511 return 0; 512 func = (xcfunc_t)cpu_xc_intr; 513 } else { 514 if ((spc->spc_flags & SPCF_NOINTR) != 0) 515 return 0; 516 /* 517 * Ensure that at least one CPU within the system 518 * is handing device interrupts. 519 */ 520 nintr = 0; 521 for (CPU_INFO_FOREACH(cii, ci2)) { 522 if ((ci2->ci_schedstate.spc_flags & SPCF_NOINTR) != 0) 523 continue; 524 if (ci2 == ci) 525 continue; 526 nintr++; 527 } 528 if (nintr == 0) 529 return EBUSY; 530 func = (xcfunc_t)cpu_xc_nointr; 531 } 532 533 where = xc_unicast(0, func, ci, NULL, ci); 534 xc_wait(where); 535 if (intr) { 536 KASSERT((spc->spc_flags & SPCF_NOINTR) == 0); 537 } else if ((spc->spc_flags & SPCF_NOINTR) == 0) { 538 /* If was not set offline, then it is busy */ 539 return EBUSY; 540 } 541 542 /* Direct interrupts away from the CPU and record the change. */ 543 cpu_intr_redistribute(); 544 spc->spc_lastmod = time_second; 545 return 0; 546 } 547 #else /* __HAVE_INTR_CONTROL */ 548 int 549 cpu_setintr(struct cpu_info *ci, bool intr) 550 { 551 552 return EOPNOTSUPP; 553 } 554 555 u_int 556 cpu_intr_count(struct cpu_info *ci) 557 { 558 559 return 0; /* 0 == "don't know" */ 560 } 561 #endif /* __HAVE_INTR_CONTROL */ 562 563 bool 564 cpu_softintr_p(void) 565 { 566 567 return (curlwp->l_pflag & LP_INTR) != 0; 568 } 569 570 #ifdef CPU_UCODE 571 int 572 cpu_ucode_load(struct cpu_ucode_softc *sc, const char *fwname) 573 { 574 firmware_handle_t fwh; 575 int error; 576 577 if (sc->sc_blob != NULL) { 578 firmware_free(sc->sc_blob, 0); 579 sc->sc_blob = NULL; 580 sc->sc_blobsize = 0; 581 } 582 583 error = cpu_ucode_md_open(&fwh, sc->loader_version, fwname); 584 if (error != 0) { 585 aprint_error("ucode: firmware_open failed: %i\n", error); 586 goto err0; 587 } 588 589 sc->sc_blobsize = firmware_get_size(fwh); 590 sc->sc_blob = firmware_malloc(sc->sc_blobsize); 591 if (sc->sc_blob == NULL) { 592 error = ENOMEM; 593 firmware_close(fwh); 594 goto err0; 595 } 596 597 error = firmware_read(fwh, 0, sc->sc_blob, sc->sc_blobsize); 598 firmware_close(fwh); 599 if (error != 0) 600 goto err1; 601 602 return 0; 603 604 err1: 605 firmware_free(sc->sc_blob, 0); 606 sc->sc_blob = NULL; 607 sc->sc_blobsize = 0; 608 err0: 609 return error; 610 } 611 #endif 612
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