kern_cpu.c revision 1.76
1 /* $NetBSD: kern_cpu.c,v 1.76 2019/10/06 02:04:26 uwe 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 1.76 2019/10/06 02:04:26 uwe Exp $"); 60 61 #include "opt_cpu_ucode.h" 62 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/idle.h> 66 #include <sys/sched.h> 67 #include <sys/intr.h> 68 #include <sys/conf.h> 69 #include <sys/cpu.h> 70 #include <sys/cpuio.h> 71 #include <sys/proc.h> 72 #include <sys/percpu.h> 73 #include <sys/kernel.h> 74 #include <sys/kauth.h> 75 #include <sys/xcall.h> 76 #include <sys/pool.h> 77 #include <sys/kmem.h> 78 #include <sys/select.h> 79 #include <sys/namei.h> 80 #include <sys/callout.h> 81 #include <sys/pcu.h> 82 83 #include <uvm/uvm_extern.h> 84 85 #include "ioconf.h" 86 87 /* 88 * If the port has stated that cpu_data is the first thing in cpu_info, 89 * verify that the claim is true. This will prevent them from getting out 90 * of sync. 91 */ 92 #ifdef __HAVE_CPU_DATA_FIRST 93 CTASSERT(offsetof(struct cpu_info, ci_data) == 0); 94 #else 95 CTASSERT(offsetof(struct cpu_info, ci_data) != 0); 96 #endif 97 98 static void cpu_xc_online(struct cpu_info *, void *); 99 static void cpu_xc_offline(struct cpu_info *, void *); 100 101 dev_type_ioctl(cpuctl_ioctl); 102 103 const struct cdevsw cpuctl_cdevsw = { 104 .d_open = nullopen, 105 .d_close = nullclose, 106 .d_read = nullread, 107 .d_write = nullwrite, 108 .d_ioctl = cpuctl_ioctl, 109 .d_stop = nullstop, 110 .d_tty = notty, 111 .d_poll = nopoll, 112 .d_mmap = nommap, 113 .d_kqfilter = nokqfilter, 114 .d_discard = nodiscard, 115 .d_flag = D_OTHER | D_MPSAFE 116 }; 117 118 kmutex_t cpu_lock __cacheline_aligned; 119 int ncpu __read_mostly; 120 int ncpuonline __read_mostly; 121 bool mp_online __read_mostly; 122 123 /* An array of CPUs. There are ncpu entries. */ 124 struct cpu_info **cpu_infos __read_mostly; 125 126 /* Note: set on mi_cpu_attach() and idle_loop(). */ 127 kcpuset_t * kcpuset_attached __read_mostly = NULL; 128 kcpuset_t * kcpuset_running __read_mostly = NULL; 129 130 int (*compat_cpuctl_ioctl)(struct lwp *, u_long, void *) = (void *)enosys; 131 132 static char cpu_model[128]; 133 134 /* 135 * mi_cpu_init: early initialisation of MI CPU related structures. 136 * 137 * Note: may not block and memory allocator is not yet available. 138 */ 139 void 140 mi_cpu_init(void) 141 { 142 143 mutex_init(&cpu_lock, MUTEX_DEFAULT, IPL_NONE); 144 145 kcpuset_create(&kcpuset_attached, true); 146 kcpuset_create(&kcpuset_running, true); 147 kcpuset_set(kcpuset_running, 0); 148 } 149 150 int 151 mi_cpu_attach(struct cpu_info *ci) 152 { 153 int error; 154 155 KASSERT(maxcpus > 0); 156 157 ci->ci_index = ncpu; 158 kcpuset_set(kcpuset_attached, cpu_index(ci)); 159 160 /* 161 * Create a convenience cpuset of just ourselves. 162 */ 163 kcpuset_create(&ci->ci_data.cpu_kcpuset, true); 164 kcpuset_set(ci->ci_data.cpu_kcpuset, cpu_index(ci)); 165 166 TAILQ_INIT(&ci->ci_data.cpu_ld_locks); 167 __cpu_simple_lock_init(&ci->ci_data.cpu_ld_lock); 168 169 /* This is useful for eg, per-cpu evcnt */ 170 snprintf(ci->ci_data.cpu_name, sizeof(ci->ci_data.cpu_name), "cpu%d", 171 cpu_index(ci)); 172 173 if (__predict_false(cpu_infos == NULL)) { 174 size_t ci_bufsize = (maxcpus + 1) * sizeof(struct cpu_info *); 175 cpu_infos = kmem_zalloc(ci_bufsize, KM_SLEEP); 176 } 177 cpu_infos[cpu_index(ci)] = ci; 178 179 sched_cpuattach(ci); 180 181 error = create_idle_lwp(ci); 182 if (error != 0) { 183 /* XXX revert sched_cpuattach */ 184 return error; 185 } 186 187 if (ci == curcpu()) 188 ci->ci_data.cpu_onproc = curlwp; 189 else 190 ci->ci_data.cpu_onproc = ci->ci_data.cpu_idlelwp; 191 192 percpu_init_cpu(ci); 193 softint_init(ci); 194 callout_init_cpu(ci); 195 xc_init_cpu(ci); 196 pool_cache_cpu_init(ci); 197 selsysinit(ci); 198 cache_cpu_init(ci); 199 TAILQ_INIT(&ci->ci_data.cpu_biodone); 200 ncpu++; 201 ncpuonline++; 202 203 return 0; 204 } 205 206 void 207 cpuctlattach(int dummy __unused) 208 { 209 210 KASSERT(cpu_infos != NULL); 211 } 212 213 int 214 cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 215 { 216 CPU_INFO_ITERATOR cii; 217 cpustate_t *cs; 218 struct cpu_info *ci; 219 int error, i; 220 u_int id; 221 222 error = 0; 223 224 mutex_enter(&cpu_lock); 225 switch (cmd) { 226 case IOC_CPU_SETSTATE: 227 cs = data; 228 error = kauth_authorize_system(l->l_cred, 229 KAUTH_SYSTEM_CPU, KAUTH_REQ_SYSTEM_CPU_SETSTATE, cs, NULL, 230 NULL); 231 if (error != 0) 232 break; 233 if (cs->cs_id >= maxcpus || 234 (ci = cpu_lookup(cs->cs_id)) == NULL) { 235 error = ESRCH; 236 break; 237 } 238 cpu_setintr(ci, cs->cs_intr); 239 error = cpu_setstate(ci, cs->cs_online); 240 break; 241 242 case IOC_CPU_GETSTATE: 243 cs = data; 244 id = cs->cs_id; 245 memset(cs, 0, sizeof(*cs)); 246 cs->cs_id = id; 247 if (cs->cs_id >= maxcpus || 248 (ci = cpu_lookup(id)) == NULL) { 249 error = ESRCH; 250 break; 251 } 252 if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 253 cs->cs_online = false; 254 else 255 cs->cs_online = true; 256 if ((ci->ci_schedstate.spc_flags & SPCF_NOINTR) != 0) 257 cs->cs_intr = false; 258 else 259 cs->cs_intr = true; 260 cs->cs_lastmod = (int32_t)ci->ci_schedstate.spc_lastmod; 261 cs->cs_lastmodhi = (int32_t) 262 (ci->ci_schedstate.spc_lastmod >> 32); 263 cs->cs_intrcnt = cpu_intr_count(ci) + 1; 264 cs->cs_hwid = ci->ci_cpuid; 265 break; 266 267 case IOC_CPU_MAPID: 268 i = 0; 269 for (CPU_INFO_FOREACH(cii, ci)) { 270 if (i++ == *(int *)data) 271 break; 272 } 273 if (ci == NULL) 274 error = ESRCH; 275 else 276 *(int *)data = cpu_index(ci); 277 break; 278 279 case IOC_CPU_GETCOUNT: 280 *(int *)data = ncpu; 281 break; 282 283 #ifdef CPU_UCODE 284 case IOC_CPU_UCODE_GET_VERSION: 285 error = cpu_ucode_get_version((struct cpu_ucode_version *)data); 286 break; 287 288 case IOC_CPU_UCODE_APPLY: 289 error = kauth_authorize_machdep(l->l_cred, 290 KAUTH_MACHDEP_CPU_UCODE_APPLY, 291 NULL, NULL, NULL, NULL); 292 if (error != 0) 293 break; 294 error = cpu_ucode_apply((const struct cpu_ucode *)data); 295 break; 296 #endif 297 298 default: 299 error = (*compat_cpuctl_ioctl)(l, cmd, data); 300 break; 301 } 302 mutex_exit(&cpu_lock); 303 304 return error; 305 } 306 307 struct cpu_info * 308 cpu_lookup(u_int idx) 309 { 310 struct cpu_info *ci; 311 312 /* 313 * cpu_infos is a NULL terminated array of MAXCPUS + 1 entries, 314 * so an index of MAXCPUS here is ok. See mi_cpu_attach. 315 */ 316 KASSERT(idx <= maxcpus); 317 318 if (__predict_false(cpu_infos == NULL)) { 319 KASSERT(idx == 0); 320 return curcpu(); 321 } 322 323 ci = cpu_infos[idx]; 324 KASSERT(ci == NULL || cpu_index(ci) == idx); 325 KASSERTMSG(idx < maxcpus || ci == NULL, "idx %d ci %p", idx, ci); 326 327 return ci; 328 } 329 330 static void 331 cpu_xc_offline(struct cpu_info *ci, void *unused) 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, void *unused) 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 } else { 436 if ((spc->spc_flags & SPCF_OFFLINE) != 0) 437 return 0; 438 nonline = 0; 439 /* 440 * Ensure that at least one CPU within the processor set 441 * stays online. Revisit this later. 442 */ 443 for (CPU_INFO_FOREACH(cii, ci2)) { 444 if ((ci2->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 445 continue; 446 if (ci2->ci_schedstate.spc_psid != spc->spc_psid) 447 continue; 448 nonline++; 449 } 450 if (nonline == 1) 451 return EBUSY; 452 func = (xcfunc_t)cpu_xc_offline; 453 } 454 455 where = xc_unicast(0, func, ci, NULL, ci); 456 xc_wait(where); 457 if (online) { 458 KASSERT((spc->spc_flags & SPCF_OFFLINE) == 0); 459 ncpuonline++; 460 } else { 461 if ((spc->spc_flags & SPCF_OFFLINE) == 0) { 462 /* If was not set offline, then it is busy */ 463 return EBUSY; 464 } 465 ncpuonline--; 466 } 467 468 spc->spc_lastmod = time_second; 469 return 0; 470 } 471 472 int 473 cpu_setmodel(const char *fmt, ...) 474 { 475 int len; 476 va_list ap; 477 478 va_start(ap, fmt); 479 len = vsnprintf(cpu_model, sizeof(cpu_model), fmt, ap); 480 va_end(ap); 481 return len; 482 } 483 484 const char * 485 cpu_getmodel(void) 486 { 487 return cpu_model; 488 } 489 490 #ifdef __HAVE_INTR_CONTROL 491 static void 492 cpu_xc_intr(struct cpu_info *ci, void *unused) 493 { 494 struct schedstate_percpu *spc; 495 int s; 496 497 spc = &ci->ci_schedstate; 498 s = splsched(); 499 spc->spc_flags &= ~SPCF_NOINTR; 500 splx(s); 501 } 502 503 static void 504 cpu_xc_nointr(struct cpu_info *ci, void *unused) 505 { 506 struct schedstate_percpu *spc; 507 int s; 508 509 spc = &ci->ci_schedstate; 510 s = splsched(); 511 spc->spc_flags |= SPCF_NOINTR; 512 splx(s); 513 } 514 515 int 516 cpu_setintr(struct cpu_info *ci, bool intr) 517 { 518 struct schedstate_percpu *spc; 519 CPU_INFO_ITERATOR cii; 520 struct cpu_info *ci2; 521 uint64_t where; 522 xcfunc_t func; 523 int nintr; 524 525 spc = &ci->ci_schedstate; 526 527 KASSERT(mutex_owned(&cpu_lock)); 528 529 if (intr) { 530 if ((spc->spc_flags & SPCF_NOINTR) == 0) 531 return 0; 532 func = (xcfunc_t)cpu_xc_intr; 533 } else { 534 if ((spc->spc_flags & SPCF_NOINTR) != 0) 535 return 0; 536 /* 537 * Ensure that at least one CPU within the system 538 * is handing device interrupts. 539 */ 540 nintr = 0; 541 for (CPU_INFO_FOREACH(cii, ci2)) { 542 if ((ci2->ci_schedstate.spc_flags & SPCF_NOINTR) != 0) 543 continue; 544 if (ci2 == ci) 545 continue; 546 nintr++; 547 } 548 if (nintr == 0) 549 return EBUSY; 550 func = (xcfunc_t)cpu_xc_nointr; 551 } 552 553 where = xc_unicast(0, func, ci, NULL, ci); 554 xc_wait(where); 555 if (intr) { 556 KASSERT((spc->spc_flags & SPCF_NOINTR) == 0); 557 } else if ((spc->spc_flags & SPCF_NOINTR) == 0) { 558 /* If was not set offline, then it is busy */ 559 return EBUSY; 560 } 561 562 /* Direct interrupts away from the CPU and record the change. */ 563 cpu_intr_redistribute(); 564 spc->spc_lastmod = time_second; 565 return 0; 566 } 567 #else /* __HAVE_INTR_CONTROL */ 568 int 569 cpu_setintr(struct cpu_info *ci, bool intr) 570 { 571 572 return EOPNOTSUPP; 573 } 574 575 u_int 576 cpu_intr_count(struct cpu_info *ci) 577 { 578 579 return 0; /* 0 == "don't know" */ 580 } 581 #endif /* __HAVE_INTR_CONTROL */ 582 583 bool 584 cpu_softintr_p(void) 585 { 586 587 return (curlwp->l_pflag & LP_INTR) != 0; 588 } 589 590 #ifdef CPU_UCODE 591 int 592 cpu_ucode_load(struct cpu_ucode_softc *sc, const char *fwname) 593 { 594 firmware_handle_t fwh; 595 int error; 596 597 if (sc->sc_blob != NULL) { 598 firmware_free(sc->sc_blob, sc->sc_blobsize); 599 sc->sc_blob = NULL; 600 sc->sc_blobsize = 0; 601 } 602 603 error = cpu_ucode_md_open(&fwh, sc->loader_version, fwname); 604 if (error != 0) { 605 aprint_error("ucode: firmware_open failed: %i\n", error); 606 goto err0; 607 } 608 609 sc->sc_blobsize = firmware_get_size(fwh); 610 if (sc->sc_blobsize == 0) { 611 error = EFTYPE; 612 firmware_close(fwh); 613 goto err0; 614 } 615 sc->sc_blob = firmware_malloc(sc->sc_blobsize); 616 if (sc->sc_blob == NULL) { 617 error = ENOMEM; 618 firmware_close(fwh); 619 goto err0; 620 } 621 622 error = firmware_read(fwh, 0, sc->sc_blob, sc->sc_blobsize); 623 firmware_close(fwh); 624 if (error != 0) 625 goto err1; 626 627 return 0; 628 629 err1: 630 firmware_free(sc->sc_blob, sc->sc_blobsize); 631 sc->sc_blob = NULL; 632 sc->sc_blobsize = 0; 633 err0: 634 return error; 635 } 636 #endif 637
Indexes created Sun Sep 21 20:09:37 GMT 2025