FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_cpu.c
1 /* $NetBSD: kern_cpu.c,v 1.93 2020/10/08 09:16:13 rin Exp $ */
2
3 /*-
4 * Copyright (c) 2007, 2008, 2009, 2010, 2012, 2019 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 /*
59 * CPU related routines not shared with rump.
60 */
61
62 #include <sys/cdefs.h>
63 __KERNEL_RCSID(0, "$NetBSD: kern_cpu.c,v 1.93 2020/10/08 09:16:13 rin Exp $");
64
65 #ifdef _KERNEL_OPT
66 #include "opt_cpu_ucode.h"
67 #endif
68
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/idle.h>
72 #include <sys/sched.h>
73 #include <sys/intr.h>
74 #include <sys/conf.h>
75 #include <sys/cpu.h>
76 #include <sys/cpuio.h>
77 #include <sys/proc.h>
78 #include <sys/percpu.h>
79 #include <sys/kernel.h>
80 #include <sys/kauth.h>
81 #include <sys/xcall.h>
82 #include <sys/pool.h>
83 #include <sys/kmem.h>
84 #include <sys/select.h>
85 #include <sys/namei.h>
86 #include <sys/callout.h>
87 #include <sys/pcu.h>
88
89 #include <uvm/uvm_extern.h>
90
91 #include "ioconf.h"
92
93 /*
94 * If the port has stated that cpu_data is the first thing in cpu_info,
95 * verify that the claim is true. This will prevent them from getting out
96 * of sync.
97 */
98 #ifdef __HAVE_CPU_DATA_FIRST
99 CTASSERT(offsetof(struct cpu_info, ci_data) == 0);
100 #else
101 CTASSERT(offsetof(struct cpu_info, ci_data) != 0);
102 #endif
103
104 int (*compat_cpuctl_ioctl)(struct lwp *, u_long, void *) = (void *)enosys;
105
106 static void cpu_xc_online(struct cpu_info *, void *);
107 static void cpu_xc_offline(struct cpu_info *, void *);
108
109 dev_type_ioctl(cpuctl_ioctl);
110
111 const struct cdevsw cpuctl_cdevsw = {
112 .d_open = nullopen,
113 .d_close = nullclose,
114 .d_read = nullread,
115 .d_write = nullwrite,
116 .d_ioctl = cpuctl_ioctl,
117 .d_stop = nullstop,
118 .d_tty = notty,
119 .d_poll = nopoll,
120 .d_mmap = nommap,
121 .d_kqfilter = nokqfilter,
122 .d_discard = nodiscard,
123 .d_flag = D_OTHER | D_MPSAFE
124 };
125
126 int
127 mi_cpu_attach(struct cpu_info *ci)
128 {
129 int error;
130
131 KASSERT(maxcpus > 0);
132
133 if ((ci->ci_index = ncpu) >= maxcpus)
134 panic("Too many CPUs. Increase MAXCPUS?");
135 kcpuset_set(kcpuset_attached, cpu_index(ci));
136
137 /*
138 * Create a convenience cpuset of just ourselves.
139 */
140 kcpuset_create(&ci->ci_data.cpu_kcpuset, true);
141 kcpuset_set(ci->ci_data.cpu_kcpuset, cpu_index(ci));
142
143 TAILQ_INIT(&ci->ci_data.cpu_ld_locks);
144 __cpu_simple_lock_init(&ci->ci_data.cpu_ld_lock);
145
146 /* This is useful for eg, per-cpu evcnt */
147 snprintf(ci->ci_data.cpu_name, sizeof(ci->ci_data.cpu_name), "cpu%d",
148 cpu_index(ci));
149
150 if (__predict_false(cpu_infos == NULL)) {
151 size_t ci_bufsize = (maxcpus + 1) * sizeof(struct cpu_info *);
152 cpu_infos = kmem_zalloc(ci_bufsize, KM_SLEEP);
153 }
154 cpu_infos[cpu_index(ci)] = ci;
155
156 sched_cpuattach(ci);
157
158 error = create_idle_lwp(ci);
159 if (error != 0) {
160 /* XXX revert sched_cpuattach */
161 return error;
162 }
163
164 if (ci == curcpu())
165 ci->ci_onproc = curlwp;
166 else
167 ci->ci_onproc = ci->ci_data.cpu_idlelwp;
168
169 percpu_init_cpu(ci);
170 softint_init(ci);
171 callout_init_cpu(ci);
172 xc_init_cpu(ci);
173 pool_cache_cpu_init(ci);
174 selsysinit(ci);
175 cache_cpu_init(ci);
176 TAILQ_INIT(&ci->ci_data.cpu_biodone);
177 ncpu++;
178 ncpuonline++;
179
180 return 0;
181 }
182
183 void
184 cpuctlattach(int dummy __unused)
185 {
186
187 KASSERT(cpu_infos != NULL);
188 }
189
190 int
191 cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l)
192 {
193 CPU_INFO_ITERATOR cii;
194 cpustate_t *cs;
195 struct cpu_info *ci;
196 int error, i;
197 u_int id;
198
199 error = 0;
200
201 mutex_enter(&cpu_lock);
202 switch (cmd) {
203 case IOC_CPU_SETSTATE:
204 cs = data;
205 error = kauth_authorize_system(l->l_cred,
206 KAUTH_SYSTEM_CPU, KAUTH_REQ_SYSTEM_CPU_SETSTATE, cs, NULL,
207 NULL);
208 if (error != 0)
209 break;
210 if (cs->cs_id >= maxcpus ||
211 (ci = cpu_lookup(cs->cs_id)) == NULL) {
212 error = ESRCH;
213 break;
214 }
215 cpu_setintr(ci, cs->cs_intr); /* XXX neglect errors */
216 error = cpu_setstate(ci, cs->cs_online);
217 break;
218
219 case IOC_CPU_GETSTATE:
220 cs = data;
221 id = cs->cs_id;
222 memset(cs, 0, sizeof(*cs));
223 cs->cs_id = id;
224 if (cs->cs_id >= maxcpus ||
225 (ci = cpu_lookup(id)) == NULL) {
226 error = ESRCH;
227 break;
228 }
229 if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0)
230 cs->cs_online = false;
231 else
232 cs->cs_online = true;
233 if ((ci->ci_schedstate.spc_flags & SPCF_NOINTR) != 0)
234 cs->cs_intr = false;
235 else
236 cs->cs_intr = true;
237 cs->cs_lastmod = (int32_t)ci->ci_schedstate.spc_lastmod;
238 cs->cs_lastmodhi = (int32_t)
239 (ci->ci_schedstate.spc_lastmod >> 32);
240 cs->cs_intrcnt = cpu_intr_count(ci) + 1;
241 cs->cs_hwid = ci->ci_cpuid;
242 break;
243
244 case IOC_CPU_MAPID:
245 i = 0;
246 for (CPU_INFO_FOREACH(cii, ci)) {
247 if (i++ == *(int *)data)
248 break;
249 }
250 if (ci == NULL)
251 error = ESRCH;
252 else
253 *(int *)data = cpu_index(ci);
254 break;
255
256 case IOC_CPU_GETCOUNT:
257 *(int *)data = ncpu;
258 break;
259
260 #ifdef CPU_UCODE
261 case IOC_CPU_UCODE_GET_VERSION:
262 error = cpu_ucode_get_version((struct cpu_ucode_version *)data);
263 break;
264
265 case IOC_CPU_UCODE_APPLY:
266 error = kauth_authorize_machdep(l->l_cred,
267 KAUTH_MACHDEP_CPU_UCODE_APPLY,
268 NULL, NULL, NULL, NULL);
269 if (error != 0)
270 break;
271 error = cpu_ucode_apply((const struct cpu_ucode *)data);
272 break;
273 #endif
274
275 default:
276 error = (*compat_cpuctl_ioctl)(l, cmd, data);
277 break;
278 }
279 mutex_exit(&cpu_lock);
280
281 return error;
282 }
283
284 struct cpu_info *
285 cpu_lookup(u_int idx)
286 {
287 struct cpu_info *ci;
288
289 /*
290 * cpu_infos is a NULL terminated array of MAXCPUS + 1 entries,
291 * so an index of MAXCPUS here is ok. See mi_cpu_attach.
292 */
293 KASSERT(idx <= maxcpus);
294
295 if (__predict_false(cpu_infos == NULL)) {
296 KASSERT(idx == 0);
297 return curcpu();
298 }
299
300 ci = cpu_infos[idx];
301 KASSERT(ci == NULL || cpu_index(ci) == idx);
302 KASSERTMSG(idx < maxcpus || ci == NULL, "idx %d ci %p", idx, ci);
303
304 return ci;
305 }
306
307 static void
308 cpu_xc_offline(struct cpu_info *ci, void *unused)
309 {
310 struct schedstate_percpu *spc, *mspc = NULL;
311 struct cpu_info *target_ci;
312 struct lwp *l;
313 CPU_INFO_ITERATOR cii;
314 int s;
315
316 /*
317 * Thread that made the cross call (separate context) holds
318 * cpu_lock on our behalf.
319 */
320 spc = &ci->ci_schedstate;
321 s = splsched();
322 spc->spc_flags |= SPCF_OFFLINE;
323 splx(s);
324
325 /* Take the first available CPU for the migration. */
326 for (CPU_INFO_FOREACH(cii, target_ci)) {
327 mspc = &target_ci->ci_schedstate;
328 if ((mspc->spc_flags & SPCF_OFFLINE) == 0)
329 break;
330 }
331 KASSERT(target_ci != NULL);
332
333 /*
334 * Migrate all non-bound threads to the other CPU. Note that this
335 * runs from the xcall thread, thus handling of LSONPROC is not needed.
336 */
337 mutex_enter(&proc_lock);
338 LIST_FOREACH(l, &alllwp, l_list) {
339 struct cpu_info *mci;
340
341 lwp_lock(l);
342 if (l->l_cpu != ci || (l->l_pflag & (LP_BOUND | LP_INTR))) {
343 lwp_unlock(l);
344 continue;
345 }
346 /* Regular case - no affinity. */
347 if (l->l_affinity == NULL) {
348 lwp_migrate(l, target_ci);
349 continue;
350 }
351 /* Affinity is set, find an online CPU in the set. */
352 for (CPU_INFO_FOREACH(cii, mci)) {
353 mspc = &mci->ci_schedstate;
354 if ((mspc->spc_flags & SPCF_OFFLINE) == 0 &&
355 kcpuset_isset(l->l_affinity, cpu_index(mci)))
356 break;
357 }
358 if (mci == NULL) {
359 lwp_unlock(l);
360 mutex_exit(&proc_lock);
361 goto fail;
362 }
363 lwp_migrate(l, mci);
364 }
365 mutex_exit(&proc_lock);
366
367 #if PCU_UNIT_COUNT > 0
368 pcu_save_all_on_cpu();
369 #endif
370
371 #ifdef __HAVE_MD_CPU_OFFLINE
372 cpu_offline_md();
373 #endif
374 return;
375 fail:
376 /* Just unset the SPCF_OFFLINE flag, caller will check */
377 s = splsched();
378 spc->spc_flags &= ~SPCF_OFFLINE;
379 splx(s);
380 }
381
382 static void
383 cpu_xc_online(struct cpu_info *ci, void *unused)
384 {
385 struct schedstate_percpu *spc;
386 int s;
387
388 spc = &ci->ci_schedstate;
389 s = splsched();
390 spc->spc_flags &= ~SPCF_OFFLINE;
391 splx(s);
392 }
393
394 int
395 cpu_setstate(struct cpu_info *ci, bool online)
396 {
397 struct schedstate_percpu *spc;
398 CPU_INFO_ITERATOR cii;
399 struct cpu_info *ci2;
400 uint64_t where;
401 xcfunc_t func;
402 int nonline;
403
404 spc = &ci->ci_schedstate;
405
406 KASSERT(mutex_owned(&cpu_lock));
407
408 if (online) {
409 if ((spc->spc_flags & SPCF_OFFLINE) == 0)
410 return 0;
411 func = (xcfunc_t)cpu_xc_online;
412 } else {
413 if ((spc->spc_flags & SPCF_OFFLINE) != 0)
414 return 0;
415 nonline = 0;
416 /*
417 * Ensure that at least one CPU within the processor set
418 * stays online. Revisit this later.
419 */
420 for (CPU_INFO_FOREACH(cii, ci2)) {
421 if ((ci2->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0)
422 continue;
423 if (ci2->ci_schedstate.spc_psid != spc->spc_psid)
424 continue;
425 nonline++;
426 }
427 if (nonline == 1)
428 return EBUSY;
429 func = (xcfunc_t)cpu_xc_offline;
430 }
431
432 where = xc_unicast(0, func, ci, NULL, ci);
433 xc_wait(where);
434 if (online) {
435 KASSERT((spc->spc_flags & SPCF_OFFLINE) == 0);
436 ncpuonline++;
437 } else {
438 if ((spc->spc_flags & SPCF_OFFLINE) == 0) {
439 /* If was not set offline, then it is busy */
440 return EBUSY;
441 }
442 ncpuonline--;
443 }
444
445 spc->spc_lastmod = time_second;
446 return 0;
447 }
448
449 #if defined(__HAVE_INTR_CONTROL)
450 static void
451 cpu_xc_intr(struct cpu_info *ci, void *unused)
452 {
453 struct schedstate_percpu *spc;
454 int s;
455
456 spc = &ci->ci_schedstate;
457 s = splsched();
458 spc->spc_flags &= ~SPCF_NOINTR;
459 splx(s);
460 }
461
462 static void
463 cpu_xc_nointr(struct cpu_info *ci, void *unused)
464 {
465 struct schedstate_percpu *spc;
466 int s;
467
468 spc = &ci->ci_schedstate;
469 s = splsched();
470 spc->spc_flags |= SPCF_NOINTR;
471 splx(s);
472 }
473
474 int
475 cpu_setintr(struct cpu_info *ci, bool intr)
476 {
477 struct schedstate_percpu *spc;
478 CPU_INFO_ITERATOR cii;
479 struct cpu_info *ci2;
480 uint64_t where;
481 xcfunc_t func;
482 int nintr;
483
484 spc = &ci->ci_schedstate;
485
486 KASSERT(mutex_owned(&cpu_lock));
487
488 if (intr) {
489 if ((spc->spc_flags & SPCF_NOINTR) == 0)
490 return 0;
491 func = (xcfunc_t)cpu_xc_intr;
492 } else {
493 if (CPU_IS_PRIMARY(ci)) /* XXX kern/45117 */
494 return EINVAL;
495 if ((spc->spc_flags & SPCF_NOINTR) != 0)
496 return 0;
497 /*
498 * Ensure that at least one CPU within the system
499 * is handing device interrupts.
500 */
501 nintr = 0;
502 for (CPU_INFO_FOREACH(cii, ci2)) {
503 if ((ci2->ci_schedstate.spc_flags & SPCF_NOINTR) != 0)
504 continue;
505 if (ci2 == ci)
506 continue;
507 nintr++;
508 }
509 if (nintr == 0)
510 return EBUSY;
511 func = (xcfunc_t)cpu_xc_nointr;
512 }
513
514 where = xc_unicast(0, func, ci, NULL, ci);
515 xc_wait(where);
516 if (intr) {
517 KASSERT((spc->spc_flags & SPCF_NOINTR) == 0);
518 } else if ((spc->spc_flags & SPCF_NOINTR) == 0) {
519 /* If was not set offline, then it is busy */
520 return EBUSY;
521 }
522
523 /* Direct interrupts away from the CPU and record the change. */
524 cpu_intr_redistribute();
525 spc->spc_lastmod = time_second;
526 return 0;
527 }
528 #else /* __HAVE_INTR_CONTROL */
529 int
530 cpu_setintr(struct cpu_info *ci, bool intr)
531 {
532
533 return EOPNOTSUPP;
534 }
535
536 u_int
537 cpu_intr_count(struct cpu_info *ci)
538 {
539
540 return 0; /* 0 == "don't know" */
541 }
542 #endif /* __HAVE_INTR_CONTROL */
543
544 #ifdef CPU_UCODE
545 int
546 cpu_ucode_load(struct cpu_ucode_softc *sc, const char *fwname)
547 {
548 firmware_handle_t fwh;
549 int error;
550
551 if (sc->sc_blob != NULL) {
552 firmware_free(sc->sc_blob, sc->sc_blobsize);
553 sc->sc_blob = NULL;
554 sc->sc_blobsize = 0;
555 }
556
557 error = cpu_ucode_md_open(&fwh, sc->loader_version, fwname);
558 if (error != 0) {
559 #ifdef DEBUG
560 printf("ucode: firmware_open(%s) failed: %i\n", fwname, error);
561 #endif
562 goto err0;
563 }
564
565 sc->sc_blobsize = firmware_get_size(fwh);
566 if (sc->sc_blobsize == 0) {
567 error = EFTYPE;
568 firmware_close(fwh);
569 goto err0;
570 }
571 sc->sc_blob = firmware_malloc(sc->sc_blobsize);
572 if (sc->sc_blob == NULL) {
573 error = ENOMEM;
574 firmware_close(fwh);
575 goto err0;
576 }
577
578 error = firmware_read(fwh, 0, sc->sc_blob, sc->sc_blobsize);
579 firmware_close(fwh);
580 if (error != 0)
581 goto err1;
582
583 return 0;
584
585 err1:
586 firmware_free(sc->sc_blob, sc->sc_blobsize);
587 sc->sc_blob = NULL;
588 sc->sc_blobsize = 0;
589 err0:
590 return error;
591 }
592 #endif
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