kern_cpu.c revision 1.69 1 /* $NetBSD: kern_cpu.c,v 1.69 2015/08/20 08:27:09 uebayasi 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 1.69 2015/08/20 08:27:09 uebayasi 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 .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 ncpuonline++;
448 } else {
449 if ((spc->spc_flags & SPCF_OFFLINE) != 0)
450 return 0;
451 nonline = 0;
452 /*
453 * Ensure that at least one CPU within the processor set
454 * stays online. Revisit this later.
455 */
456 for (CPU_INFO_FOREACH(cii, ci2)) {
457 if ((ci2->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0)
458 continue;
459 if (ci2->ci_schedstate.spc_psid != spc->spc_psid)
460 continue;
461 nonline++;
462 }
463 if (nonline == 1)
464 return EBUSY;
465 func = (xcfunc_t)cpu_xc_offline;
466 ncpuonline--;
467 }
468
469 where = xc_unicast(0, func, ci, NULL, ci);
470 xc_wait(where);
471 if (online) {
472 KASSERT((spc->spc_flags & SPCF_OFFLINE) == 0);
473 } else if ((spc->spc_flags & SPCF_OFFLINE) == 0) {
474 /* If was not set offline, then it is busy */
475 return EBUSY;
476 }
477
478 spc->spc_lastmod = time_second;
479 return 0;
480 }
481
482 int
483 cpu_setmodel(const char *fmt, ...)
484 {
485 int len;
486 va_list ap;
487
488 va_start(ap, fmt);
489 len = vsnprintf(cpu_model, sizeof(cpu_model), fmt, ap);
490 va_end(ap);
491 return len;
492 }
493
494 const char *
495 cpu_getmodel(void)
496 {
497 return cpu_model;
498 }
499
500 #ifdef __HAVE_INTR_CONTROL
501 static void
502 cpu_xc_intr(struct cpu_info *ci)
503 {
504 struct schedstate_percpu *spc;
505 int s;
506
507 spc = &ci->ci_schedstate;
508 s = splsched();
509 spc->spc_flags &= ~SPCF_NOINTR;
510 splx(s);
511 }
512
513 static void
514 cpu_xc_nointr(struct cpu_info *ci)
515 {
516 struct schedstate_percpu *spc;
517 int s;
518
519 spc = &ci->ci_schedstate;
520 s = splsched();
521 spc->spc_flags |= SPCF_NOINTR;
522 splx(s);
523 }
524
525 int
526 cpu_setintr(struct cpu_info *ci, bool intr)
527 {
528 struct schedstate_percpu *spc;
529 CPU_INFO_ITERATOR cii;
530 struct cpu_info *ci2;
531 uint64_t where;
532 xcfunc_t func;
533 int nintr;
534
535 spc = &ci->ci_schedstate;
536
537 KASSERT(mutex_owned(&cpu_lock));
538
539 if (intr) {
540 if ((spc->spc_flags & SPCF_NOINTR) == 0)
541 return 0;
542 func = (xcfunc_t)cpu_xc_intr;
543 } else {
544 if ((spc->spc_flags & SPCF_NOINTR) != 0)
545 return 0;
546 /*
547 * Ensure that at least one CPU within the system
548 * is handing device interrupts.
549 */
550 nintr = 0;
551 for (CPU_INFO_FOREACH(cii, ci2)) {
552 if ((ci2->ci_schedstate.spc_flags & SPCF_NOINTR) != 0)
553 continue;
554 if (ci2 == ci)
555 continue;
556 nintr++;
557 }
558 if (nintr == 0)
559 return EBUSY;
560 func = (xcfunc_t)cpu_xc_nointr;
561 }
562
563 where = xc_unicast(0, func, ci, NULL, ci);
564 xc_wait(where);
565 if (intr) {
566 KASSERT((spc->spc_flags & SPCF_NOINTR) == 0);
567 } else if ((spc->spc_flags & SPCF_NOINTR) == 0) {
568 /* If was not set offline, then it is busy */
569 return EBUSY;
570 }
571
572 /* Direct interrupts away from the CPU and record the change. */
573 cpu_intr_redistribute();
574 spc->spc_lastmod = time_second;
575 return 0;
576 }
577 #else /* __HAVE_INTR_CONTROL */
578 int
579 cpu_setintr(struct cpu_info *ci, bool intr)
580 {
581
582 return EOPNOTSUPP;
583 }
584
585 u_int
586 cpu_intr_count(struct cpu_info *ci)
587 {
588
589 return 0; /* 0 == "don't know" */
590 }
591 #endif /* __HAVE_INTR_CONTROL */
592
593 bool
594 cpu_softintr_p(void)
595 {
596
597 return (curlwp->l_pflag & LP_INTR) != 0;
598 }
599
600 #ifdef CPU_UCODE
601 int
602 cpu_ucode_load(struct cpu_ucode_softc *sc, const char *fwname)
603 {
604 firmware_handle_t fwh;
605 int error;
606
607 if (sc->sc_blob != NULL) {
608 firmware_free(sc->sc_blob, sc->sc_blobsize);
609 sc->sc_blob = NULL;
610 sc->sc_blobsize = 0;
611 }
612
613 error = cpu_ucode_md_open(&fwh, sc->loader_version, fwname);
614 if (error != 0) {
615 aprint_error("ucode: firmware_open failed: %i\n", error);
616 goto err0;
617 }
618
619 sc->sc_blobsize = firmware_get_size(fwh);
620 sc->sc_blob = firmware_malloc(sc->sc_blobsize);
621 if (sc->sc_blob == NULL) {
622 error = ENOMEM;
623 firmware_close(fwh);
624 goto err0;
625 }
626
627 error = firmware_read(fwh, 0, sc->sc_blob, sc->sc_blobsize);
628 firmware_close(fwh);
629 if (error != 0)
630 goto err1;
631
632 return 0;
633
634 err1:
635 firmware_free(sc->sc_blob, sc->sc_blobsize);
636 sc->sc_blob = NULL;
637 sc->sc_blobsize = 0;
638 err0:
639 return error;
640 }
641 #endif
642