| 1 | /* $NetBSD: kern_cpu.c,v 1.71 2015/08/29 12:24:00 maxv 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 1.71 2015/08/29 12:24:00 maxv 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 | #include "ioconf.h" |
| 87 | |
| 88 | /* |
| 89 | * If the port has stated that cpu_data is the first thing in cpu_info, |
| 90 | * verify that the claim is true. This will prevent them from getting out |
| 91 | * of sync. |
| 92 | */ |
| 93 | #ifdef __HAVE_CPU_DATA_FIRST |
| 94 | CTASSERT(offsetof(struct cpu_info, ci_data) == 0); |
| 95 | #else |
| 96 | CTASSERT(offsetof(struct cpu_info, ci_data) != 0); |
| 97 | #endif |
| 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 | .d_open = nullopen, |
| 106 | .d_close = nullclose, |
| 107 | .d_read = nullread, |
| 108 | .d_write = nullwrite, |
| 109 | .d_ioctl = cpuctl_ioctl, |
| 110 | .d_stop = nullstop, |
| 111 | .d_tty = notty, |
| 112 | .d_poll = nopoll, |
| 113 | .d_mmap = nommap, |
| 114 | .d_kqfilter = nokqfilter, |
| 115 | .d_discard = nodiscard, |
| 116 | .d_flag = D_OTHER | D_MPSAFE |
| 117 | }; |
| 118 | |
| 119 | kmutex_t cpu_lock __cacheline_aligned; |
| 120 | int ncpu __read_mostly; |
| 121 | int ncpuonline __read_mostly; |
| 122 | bool mp_online __read_mostly; |
| 123 | |
| 124 | /* An array of CPUs. There are ncpu entries. */ |
| 125 | struct cpu_info **cpu_infos __read_mostly; |
| 126 | |
| 127 | /* Note: set on mi_cpu_attach() and idle_loop(). */ |
| 128 | kcpuset_t * kcpuset_attached __read_mostly = NULL; |
| 129 | kcpuset_t * kcpuset_running __read_mostly = NULL; |
| 130 | |
| 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 | #ifdef COMPAT_60 |
| 289 | case OIOC_CPU_UCODE_GET_VERSION: |
| 290 | error = compat6_cpu_ucode_get_version((struct compat6_cpu_ucode *)data); |
| 291 | break; |
| 292 | #endif |
| 293 | |
| 294 | case IOC_CPU_UCODE_APPLY: |
| 295 | error = kauth_authorize_machdep(l->l_cred, |
| 296 | KAUTH_MACHDEP_CPU_UCODE_APPLY, |
| 297 | NULL, NULL, NULL, NULL); |
| 298 | if (error != 0) |
| 299 | break; |
| 300 | error = cpu_ucode_apply((const struct cpu_ucode *)data); |
| 301 | break; |
| 302 | |
| 303 | #ifdef COMPAT_60 |
| 304 | case OIOC_CPU_UCODE_APPLY: |
| 305 | error = kauth_authorize_machdep(l->l_cred, |
| 306 | KAUTH_MACHDEP_CPU_UCODE_APPLY, |
| 307 | NULL, NULL, NULL, NULL); |
| 308 | if (error != 0) |
| 309 | break; |
| 310 | error = compat6_cpu_ucode_apply((const struct compat6_cpu_ucode *)data); |
| 311 | break; |
| 312 | #endif |
| 313 | #endif |
| 314 | |
| 315 | default: |
| 316 | error = ENOTTY; |
| 317 | break; |
| 318 | } |
| 319 | mutex_exit(&cpu_lock); |
| 320 | |
| 321 | return error; |
| 322 | } |
| 323 | |
| 324 | struct cpu_info * |
| 325 | cpu_lookup(u_int idx) |
| 326 | { |
| 327 | struct cpu_info *ci; |
| 328 | |
| 329 | KASSERT(idx < maxcpus); |
| 330 | |
| 331 | if (__predict_false(cpu_infos == NULL)) { |
| 332 | KASSERT(idx == 0); |
| 333 | return curcpu(); |
| 334 | } |
| 335 | |
| 336 | ci = cpu_infos[idx]; |
| 337 | KASSERT(ci == NULL || cpu_index(ci) == idx); |
| 338 | |
| 339 | return ci; |
| 340 | } |
| 341 | |
| 342 | static void |
| 343 | cpu_xc_offline(struct cpu_info *ci) |
| 344 | { |
| 345 | struct schedstate_percpu *spc, *mspc = NULL; |
| 346 | struct cpu_info *target_ci; |
| 347 | struct lwp *l; |
| 348 | CPU_INFO_ITERATOR cii; |
| 349 | int s; |
| 350 | |
| 351 | /* |
| 352 | * Thread that made the cross call (separate context) holds |
| 353 | * cpu_lock on our behalf. |
| 354 | */ |
| 355 | spc = &ci->ci_schedstate; |
| 356 | s = splsched(); |
| 357 | spc->spc_flags |= SPCF_OFFLINE; |
| 358 | splx(s); |
| 359 | |
| 360 | /* Take the first available CPU for the migration. */ |
| 361 | for (CPU_INFO_FOREACH(cii, target_ci)) { |
| 362 | mspc = &target_ci->ci_schedstate; |
| 363 | if ((mspc->spc_flags & SPCF_OFFLINE) == 0) |
| 364 | break; |
| 365 | } |
| 366 | KASSERT(target_ci != NULL); |
| 367 | |
| 368 | /* |
| 369 | * Migrate all non-bound threads to the other CPU. Note that this |
| 370 | * runs from the xcall thread, thus handling of LSONPROC is not needed. |
| 371 | */ |
| 372 | mutex_enter(proc_lock); |
| 373 | LIST_FOREACH(l, &alllwp, l_list) { |
| 374 | struct cpu_info *mci; |
| 375 | |
| 376 | lwp_lock(l); |
| 377 | if (l->l_cpu != ci || (l->l_pflag & (LP_BOUND | LP_INTR))) { |
| 378 | lwp_unlock(l); |
| 379 | continue; |
| 380 | } |
| 381 | /* Regular case - no affinity. */ |
| 382 | if (l->l_affinity == NULL) { |
| 383 | lwp_migrate(l, target_ci); |
| 384 | continue; |
| 385 | } |
| 386 | /* Affinity is set, find an online CPU in the set. */ |
| 387 | for (CPU_INFO_FOREACH(cii, mci)) { |
| 388 | mspc = &mci->ci_schedstate; |
| 389 | if ((mspc->spc_flags & SPCF_OFFLINE) == 0 && |
| 390 | kcpuset_isset(l->l_affinity, cpu_index(mci))) |
| 391 | break; |
| 392 | } |
| 393 | if (mci == NULL) { |
| 394 | lwp_unlock(l); |
| 395 | mutex_exit(proc_lock); |
| 396 | goto fail; |
| 397 | } |
| 398 | lwp_migrate(l, mci); |
| 399 | } |
| 400 | mutex_exit(proc_lock); |
| 401 | |
| 402 | #if PCU_UNIT_COUNT > 0 |
| 403 | pcu_save_all_on_cpu(); |
| 404 | #endif |
| 405 | |
| 406 | #ifdef __HAVE_MD_CPU_OFFLINE |
| 407 | cpu_offline_md(); |
| 408 | #endif |
| 409 | return; |
| 410 | fail: |
| 411 | /* Just unset the SPCF_OFFLINE flag, caller will check */ |
| 412 | s = splsched(); |
| 413 | spc->spc_flags &= ~SPCF_OFFLINE; |
| 414 | splx(s); |
| 415 | } |
| 416 | |
| 417 | static void |
| 418 | cpu_xc_online(struct cpu_info *ci) |
| 419 | { |
| 420 | struct schedstate_percpu *spc; |
| 421 | int s; |
| 422 | |
| 423 | spc = &ci->ci_schedstate; |
| 424 | s = splsched(); |
| 425 | spc->spc_flags &= ~SPCF_OFFLINE; |
| 426 | splx(s); |
| 427 | } |
| 428 | |
| 429 | int |
| 430 | cpu_setstate(struct cpu_info *ci, bool online) |
| 431 | { |
| 432 | struct schedstate_percpu *spc; |
| 433 | CPU_INFO_ITERATOR cii; |
| 434 | struct cpu_info *ci2; |
| 435 | uint64_t where; |
| 436 | xcfunc_t func; |
| 437 | int nonline; |
| 438 | |
| 439 | spc = &ci->ci_schedstate; |
| 440 | |
| 441 | KASSERT(mutex_owned(&cpu_lock)); |
| 442 | |
| 443 | if (online) { |
| 444 | if ((spc->spc_flags & SPCF_OFFLINE) == 0) |
| 445 | return 0; |
| 446 | func = (xcfunc_t)cpu_xc_online; |
| 447 | } else { |
| 448 | if ((spc->spc_flags & SPCF_OFFLINE) != 0) |
| 449 | return 0; |
| 450 | nonline = 0; |
| 451 | /* |
| 452 | * Ensure that at least one CPU within the processor set |
| 453 | * stays online. Revisit this later. |
| 454 | */ |
| 455 | for (CPU_INFO_FOREACH(cii, ci2)) { |
| 456 | if ((ci2->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) |
| 457 | continue; |
| 458 | if (ci2->ci_schedstate.spc_psid != spc->spc_psid) |
| 459 | continue; |
| 460 | nonline++; |
| 461 | } |
| 462 | if (nonline == 1) |
| 463 | return EBUSY; |
| 464 | func = (xcfunc_t)cpu_xc_offline; |
| 465 | } |
| 466 | |
| 467 | where = xc_unicast(0, func, ci, NULL, ci); |
| 468 | xc_wait(where); |
| 469 | if (online) { |
| 470 | KASSERT((spc->spc_flags & SPCF_OFFLINE) == 0); |
| 471 | ncpuonline++; |
| 472 | } else { |
| 473 | if ((spc->spc_flags & SPCF_OFFLINE) == 0) { |
| 474 | /* If was not set offline, then it is busy */ |
| 475 | return EBUSY; |
| 476 | } |
| 477 | ncpuonline--; |
| 478 | } |
| 479 | |
| 480 | spc->spc_lastmod = time_second; |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | int |
| 485 | cpu_setmodel(const char *fmt, ...) |
| 486 | { |
| 487 | int len; |
| 488 | va_list ap; |
| 489 | |
| 490 | va_start(ap, fmt); |
| 491 | len = vsnprintf(cpu_model, sizeof(cpu_model), fmt, ap); |
| 492 | va_end(ap); |
| 493 | return len; |
| 494 | } |
| 495 | |
| 496 | const char * |
| 497 | cpu_getmodel(void) |
| 498 | { |
| 499 | return cpu_model; |
| 500 | } |
| 501 | |
| 502 | #ifdef __HAVE_INTR_CONTROL |
| 503 | static void |
| 504 | cpu_xc_intr(struct cpu_info *ci) |
| 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 | static void |
| 516 | cpu_xc_nointr(struct cpu_info *ci) |
| 517 | { |
| 518 | struct schedstate_percpu *spc; |
| 519 | int s; |
| 520 | |
| 521 | spc = &ci->ci_schedstate; |
| 522 | s = splsched(); |
| 523 | spc->spc_flags |= SPCF_NOINTR; |
| 524 | splx(s); |
| 525 | } |
| 526 | |
| 527 | int |
| 528 | cpu_setintr(struct cpu_info *ci, bool intr) |
| 529 | { |
| 530 | struct schedstate_percpu *spc; |
| 531 | CPU_INFO_ITERATOR cii; |
| 532 | struct cpu_info *ci2; |
| 533 | uint64_t where; |
| 534 | xcfunc_t func; |
| 535 | int nintr; |
| 536 | |
| 537 | spc = &ci->ci_schedstate; |
| 538 | |
| 539 | KASSERT(mutex_owned(&cpu_lock)); |
| 540 | |
| 541 | if (intr) { |
| 542 | if ((spc->spc_flags & SPCF_NOINTR) == 0) |
| 543 | return 0; |
| 544 | func = (xcfunc_t)cpu_xc_intr; |
| 545 | } else { |
| 546 | if ((spc->spc_flags & SPCF_NOINTR) != 0) |
| 547 | return 0; |
| 548 | /* |
| 549 | * Ensure that at least one CPU within the system |
| 550 | * is handing device interrupts. |
| 551 | */ |
| 552 | nintr = 0; |
| 553 | for (CPU_INFO_FOREACH(cii, ci2)) { |
| 554 | if ((ci2->ci_schedstate.spc_flags & SPCF_NOINTR) != 0) |
| 555 | continue; |
| 556 | if (ci2 == ci) |
| 557 | continue; |
| 558 | nintr++; |
| 559 | } |
| 560 | if (nintr == 0) |
| 561 | return EBUSY; |
| 562 | func = (xcfunc_t)cpu_xc_nointr; |
| 563 | } |
| 564 | |
| 565 | where = xc_unicast(0, func, ci, NULL, ci); |
| 566 | xc_wait(where); |
| 567 | if (intr) { |
| 568 | KASSERT((spc->spc_flags & SPCF_NOINTR) == 0); |
| 569 | } else if ((spc->spc_flags & SPCF_NOINTR) == 0) { |
| 570 | /* If was not set offline, then it is busy */ |
| 571 | return EBUSY; |
| 572 | } |
| 573 | |
| 574 | /* Direct interrupts away from the CPU and record the change. */ |
| 575 | cpu_intr_redistribute(); |
| 576 | spc->spc_lastmod = time_second; |
| 577 | return 0; |
| 578 | } |
| 579 | #else /* __HAVE_INTR_CONTROL */ |
| 580 | int |
| 581 | cpu_setintr(struct cpu_info *ci, bool intr) |
| 582 | { |
| 583 | |
| 584 | return EOPNOTSUPP; |
| 585 | } |
| 586 | |
| 587 | u_int |
| 588 | cpu_intr_count(struct cpu_info *ci) |
| 589 | { |
| 590 | |
| 591 | return 0; /* 0 == "don't know" */ |
| 592 | } |
| 593 | #endif /* __HAVE_INTR_CONTROL */ |
| 594 | |
| 595 | bool |
| 596 | cpu_softintr_p(void) |
| 597 | { |
| 598 | |
| 599 | return (curlwp->l_pflag & LP_INTR) != 0; |
| 600 | } |
| 601 | |
| 602 | #ifdef CPU_UCODE |
| 603 | int |
| 604 | cpu_ucode_load(struct cpu_ucode_softc *sc, const char *fwname) |
| 605 | { |
| 606 | firmware_handle_t fwh; |
| 607 | int error; |
| 608 | |
| 609 | if (sc->sc_blob != NULL) { |
| 610 | firmware_free(sc->sc_blob, sc->sc_blobsize); |
| 611 | sc->sc_blob = NULL; |
| 612 | sc->sc_blobsize = 0; |
| 613 | } |
| 614 | |
| 615 | error = cpu_ucode_md_open(&fwh, sc->loader_version, fwname); |
| 616 | if (error != 0) { |
| 617 | aprint_error("ucode: firmware_open failed: %i\n" , error); |
| 618 | goto err0; |
| 619 | } |
| 620 | |
| 621 | sc->sc_blobsize = firmware_get_size(fwh); |
| 622 | sc->sc_blob = firmware_malloc(sc->sc_blobsize); |
| 623 | if (sc->sc_blob == NULL) { |
| 624 | error = ENOMEM; |
| 625 | firmware_close(fwh); |
| 626 | goto err0; |
| 627 | } |
| 628 | |
| 629 | error = firmware_read(fwh, 0, sc->sc_blob, sc->sc_blobsize); |
| 630 | firmware_close(fwh); |
| 631 | if (error != 0) |
| 632 | goto err1; |
| 633 | |
| 634 | return 0; |
| 635 | |
| 636 | err1: |
| 637 | firmware_free(sc->sc_blob, sc->sc_blobsize); |
| 638 | sc->sc_blob = NULL; |
| 639 | sc->sc_blobsize = 0; |
| 640 | err0: |
| 641 | return error; |
| 642 | } |
| 643 | #endif |
| 644 | |