1 /*-
2 * Copyright (c) 1996, by Steve Passe
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. The name of the developer may NOT be used to endorse or promote products
11 * derived from this software without specific prior written permission.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD: releng/10.3/sys/i386/i386/mp_machdep.c 286852 2015-08-17 18:33:16Z kib $");
28
29 #include "opt_apic.h"
30 #include "opt_cpu.h"
31 #include "opt_kstack_pages.h"
32 #include "opt_pmap.h"
33 #include "opt_sched.h"
34 #include "opt_smp.h"
35
36 #if !defined(lint)
37 #if !defined(SMP)
38 #error How did you get here?
39 #endif
40
41 #ifndef DEV_APIC
42 #error The apic device is required for SMP, add "device apic" to your config file.
43 #endif
44 #if defined(CPU_DISABLE_CMPXCHG) && !defined(COMPILING_LINT)
45 #error SMP not supported with CPU_DISABLE_CMPXCHG
46 #endif
47 #endif /* not lint */
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/bus.h>
52 #include <sys/cons.h> /* cngetc() */
53 #include <sys/cpuset.h>
54 #ifdef GPROF
55 #include <sys/gmon.h>
56 #endif
57 #include <sys/kernel.h>
58 #include <sys/ktr.h>
59 #include <sys/lock.h>
60 #include <sys/malloc.h>
61 #include <sys/memrange.h>
62 #include <sys/mutex.h>
63 #include <sys/pcpu.h>
64 #include <sys/proc.h>
65 #include <sys/sched.h>
66 #include <sys/smp.h>
67 #include <sys/sysctl.h>
68
69 #include <vm/vm.h>
70 #include <vm/vm_param.h>
71 #include <vm/pmap.h>
72 #include <vm/vm_kern.h>
73 #include <vm/vm_extern.h>
74
75 #include <x86/apicreg.h>
76 #include <machine/clock.h>
77 #include <machine/cputypes.h>
78 #include <x86/mca.h>
79 #include <machine/md_var.h>
80 #include <machine/pcb.h>
81 #include <machine/psl.h>
82 #include <machine/smp.h>
83 #include <machine/specialreg.h>
84 #include <machine/cpu.h>
85
86 #define WARMBOOT_TARGET 0
87 #define WARMBOOT_OFF (KERNBASE + 0x0467)
88 #define WARMBOOT_SEG (KERNBASE + 0x0469)
89
90 #define CMOS_REG (0x70)
91 #define CMOS_DATA (0x71)
92 #define BIOS_RESET (0x0f)
93 #define BIOS_WARM (0x0a)
94
95 /*
96 * this code MUST be enabled here and in mpboot.s.
97 * it follows the very early stages of AP boot by placing values in CMOS ram.
98 * it NORMALLY will never be needed and thus the primitive method for enabling.
99 *
100 #define CHECK_POINTS
101 */
102
103 #if defined(CHECK_POINTS) && !defined(PC98)
104 #define CHECK_READ(A) (outb(CMOS_REG, (A)), inb(CMOS_DATA))
105 #define CHECK_WRITE(A,D) (outb(CMOS_REG, (A)), outb(CMOS_DATA, (D)))
106
107 #define CHECK_INIT(D); \
108 CHECK_WRITE(0x34, (D)); \
109 CHECK_WRITE(0x35, (D)); \
110 CHECK_WRITE(0x36, (D)); \
111 CHECK_WRITE(0x37, (D)); \
112 CHECK_WRITE(0x38, (D)); \
113 CHECK_WRITE(0x39, (D));
114
115 #define CHECK_PRINT(S); \
116 printf("%s: %d, %d, %d, %d, %d, %d\n", \
117 (S), \
118 CHECK_READ(0x34), \
119 CHECK_READ(0x35), \
120 CHECK_READ(0x36), \
121 CHECK_READ(0x37), \
122 CHECK_READ(0x38), \
123 CHECK_READ(0x39));
124
125 #else /* CHECK_POINTS */
126
127 #define CHECK_INIT(D)
128 #define CHECK_PRINT(S)
129 #define CHECK_WRITE(A, D)
130
131 #endif /* CHECK_POINTS */
132
133 /* lock region used by kernel profiling */
134 int mcount_lock;
135
136 int mp_naps; /* # of Applications processors */
137 int boot_cpu_id = -1; /* designated BSP */
138
139 extern struct pcpu __pcpu[];
140
141 /* AP uses this during bootstrap. Do not staticize. */
142 char *bootSTK;
143 static int bootAP;
144
145 /* Free these after use */
146 void *bootstacks[MAXCPU];
147 static void *dpcpu;
148
149 struct pcb stoppcbs[MAXCPU];
150 struct susppcb **susppcbs;
151
152 /* Variables needed for SMP tlb shootdown. */
153 vm_offset_t smp_tlb_addr1;
154 vm_offset_t smp_tlb_addr2;
155 volatile int smp_tlb_wait;
156
157 #ifdef COUNT_IPIS
158 /* Interrupt counts. */
159 static u_long *ipi_preempt_counts[MAXCPU];
160 static u_long *ipi_ast_counts[MAXCPU];
161 u_long *ipi_invltlb_counts[MAXCPU];
162 u_long *ipi_invlrng_counts[MAXCPU];
163 u_long *ipi_invlpg_counts[MAXCPU];
164 u_long *ipi_invlcache_counts[MAXCPU];
165 u_long *ipi_rendezvous_counts[MAXCPU];
166 u_long *ipi_lazypmap_counts[MAXCPU];
167 static u_long *ipi_hardclock_counts[MAXCPU];
168 #endif
169
170 /* Default cpu_ops implementation. */
171 struct cpu_ops cpu_ops = {
172 .ipi_vectored = lapic_ipi_vectored
173 };
174
175 /*
176 * Local data and functions.
177 */
178
179 static volatile cpuset_t ipi_nmi_pending;
180
181 /* used to hold the AP's until we are ready to release them */
182 static struct mtx ap_boot_mtx;
183
184 /* Set to 1 once we're ready to let the APs out of the pen. */
185 static volatile int aps_ready = 0;
186
187 /*
188 * Store data from cpu_add() until later in the boot when we actually setup
189 * the APs.
190 */
191 struct cpu_info {
192 int cpu_present:1;
193 int cpu_bsp:1;
194 int cpu_disabled:1;
195 int cpu_hyperthread:1;
196 } static cpu_info[MAX_APIC_ID + 1];
197 int cpu_apic_ids[MAXCPU];
198 int apic_cpuids[MAX_APIC_ID + 1];
199
200 /* Holds pending bitmap based IPIs per CPU */
201 volatile u_int cpu_ipi_pending[MAXCPU];
202
203 static u_int boot_address;
204 static int cpu_logical; /* logical cpus per core */
205 static int cpu_cores; /* cores per package */
206
207 static void assign_cpu_ids(void);
208 static void install_ap_tramp(void);
209 static void set_interrupt_apic_ids(void);
210 static int start_all_aps(void);
211 static int start_ap(int apic_id);
212 static void release_aps(void *dummy);
213
214 static u_int hyperthreading_cpus; /* logical cpus sharing L1 cache */
215 static int hyperthreading_allowed = 1;
216
217 static void
218 mem_range_AP_init(void)
219 {
220 if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP)
221 mem_range_softc.mr_op->initAP(&mem_range_softc);
222 }
223
224 static void
225 topo_probe_amd(void)
226 {
227 int core_id_bits;
228 int id;
229
230 /* AMD processors do not support HTT. */
231 cpu_logical = 1;
232
233 if ((amd_feature2 & AMDID2_CMP) == 0) {
234 cpu_cores = 1;
235 return;
236 }
237
238 core_id_bits = (cpu_procinfo2 & AMDID_COREID_SIZE) >>
239 AMDID_COREID_SIZE_SHIFT;
240 if (core_id_bits == 0) {
241 cpu_cores = (cpu_procinfo2 & AMDID_CMP_CORES) + 1;
242 return;
243 }
244
245 /* Fam 10h and newer should get here. */
246 for (id = 0; id <= MAX_APIC_ID; id++) {
247 /* Check logical CPU availability. */
248 if (!cpu_info[id].cpu_present || cpu_info[id].cpu_disabled)
249 continue;
250 /* Check if logical CPU has the same package ID. */
251 if ((id >> core_id_bits) != (boot_cpu_id >> core_id_bits))
252 continue;
253 cpu_cores++;
254 }
255 }
256
257 /*
258 * Round up to the next power of two, if necessary, and then
259 * take log2.
260 * Returns -1 if argument is zero.
261 */
262 static __inline int
263 mask_width(u_int x)
264 {
265
266 return (fls(x << (1 - powerof2(x))) - 1);
267 }
268
269 static void
270 topo_probe_0x4(void)
271 {
272 u_int p[4];
273 int pkg_id_bits;
274 int core_id_bits;
275 int max_cores;
276 int max_logical;
277 int id;
278
279 /* Both zero and one here mean one logical processor per package. */
280 max_logical = (cpu_feature & CPUID_HTT) != 0 ?
281 (cpu_procinfo & CPUID_HTT_CORES) >> 16 : 1;
282 if (max_logical <= 1)
283 return;
284
285 /*
286 * Because of uniformity assumption we examine only
287 * those logical processors that belong to the same
288 * package as BSP. Further, we count number of
289 * logical processors that belong to the same core
290 * as BSP thus deducing number of threads per core.
291 */
292 if (cpu_high >= 0x4) {
293 cpuid_count(0x04, 0, p);
294 max_cores = ((p[0] >> 26) & 0x3f) + 1;
295 } else
296 max_cores = 1;
297 core_id_bits = mask_width(max_logical/max_cores);
298 if (core_id_bits < 0)
299 return;
300 pkg_id_bits = core_id_bits + mask_width(max_cores);
301
302 for (id = 0; id <= MAX_APIC_ID; id++) {
303 /* Check logical CPU availability. */
304 if (!cpu_info[id].cpu_present || cpu_info[id].cpu_disabled)
305 continue;
306 /* Check if logical CPU has the same package ID. */
307 if ((id >> pkg_id_bits) != (boot_cpu_id >> pkg_id_bits))
308 continue;
309 cpu_cores++;
310 /* Check if logical CPU has the same package and core IDs. */
311 if ((id >> core_id_bits) == (boot_cpu_id >> core_id_bits))
312 cpu_logical++;
313 }
314
315 KASSERT(cpu_cores >= 1 && cpu_logical >= 1,
316 ("topo_probe_0x4 couldn't find BSP"));
317
318 cpu_cores /= cpu_logical;
319 hyperthreading_cpus = cpu_logical;
320 }
321
322 static void
323 topo_probe_0xb(void)
324 {
325 u_int p[4];
326 int bits;
327 int cnt;
328 int i;
329 int logical;
330 int type;
331 int x;
332
333 /* We only support three levels for now. */
334 for (i = 0; i < 3; i++) {
335 cpuid_count(0x0b, i, p);
336
337 /* Fall back if CPU leaf 11 doesn't really exist. */
338 if (i == 0 && p[1] == 0) {
339 topo_probe_0x4();
340 return;
341 }
342
343 bits = p[0] & 0x1f;
344 logical = p[1] &= 0xffff;
345 type = (p[2] >> 8) & 0xff;
346 if (type == 0 || logical == 0)
347 break;
348 /*
349 * Because of uniformity assumption we examine only
350 * those logical processors that belong to the same
351 * package as BSP.
352 */
353 for (cnt = 0, x = 0; x <= MAX_APIC_ID; x++) {
354 if (!cpu_info[x].cpu_present ||
355 cpu_info[x].cpu_disabled)
356 continue;
357 if (x >> bits == boot_cpu_id >> bits)
358 cnt++;
359 }
360 if (type == CPUID_TYPE_SMT)
361 cpu_logical = cnt;
362 else if (type == CPUID_TYPE_CORE)
363 cpu_cores = cnt;
364 }
365 if (cpu_logical == 0)
366 cpu_logical = 1;
367 cpu_cores /= cpu_logical;
368 }
369
370 /*
371 * Both topology discovery code and code that consumes topology
372 * information assume top-down uniformity of the topology.
373 * That is, all physical packages must be identical and each
374 * core in a package must have the same number of threads.
375 * Topology information is queried only on BSP, on which this
376 * code runs and for which it can query CPUID information.
377 * Then topology is extrapolated on all packages using the
378 * uniformity assumption.
379 */
380 static void
381 topo_probe(void)
382 {
383 static int cpu_topo_probed = 0;
384
385 if (cpu_topo_probed)
386 return;
387
388 CPU_ZERO(&logical_cpus_mask);
389 if (mp_ncpus <= 1)
390 cpu_cores = cpu_logical = 1;
391 else if (cpu_vendor_id == CPU_VENDOR_AMD)
392 topo_probe_amd();
393 else if (cpu_vendor_id == CPU_VENDOR_INTEL) {
394 /*
395 * See Intel(R) 64 Architecture Processor
396 * Topology Enumeration article for details.
397 *
398 * Note that 0x1 <= cpu_high < 4 case should be
399 * compatible with topo_probe_0x4() logic when
400 * CPUID.1:EBX[23:16] > 0 (cpu_cores will be 1)
401 * or it should trigger the fallback otherwise.
402 */
403 if (cpu_high >= 0xb)
404 topo_probe_0xb();
405 else if (cpu_high >= 0x1)
406 topo_probe_0x4();
407 }
408
409 /*
410 * Fallback: assume each logical CPU is in separate
411 * physical package. That is, no multi-core, no SMT.
412 */
413 if (cpu_cores == 0 || cpu_logical == 0)
414 cpu_cores = cpu_logical = 1;
415 cpu_topo_probed = 1;
416 }
417
418 struct cpu_group *
419 cpu_topo(void)
420 {
421 int cg_flags;
422
423 /*
424 * Determine whether any threading flags are
425 * necessry.
426 */
427 topo_probe();
428 if (cpu_logical > 1 && hyperthreading_cpus)
429 cg_flags = CG_FLAG_HTT;
430 else if (cpu_logical > 1)
431 cg_flags = CG_FLAG_SMT;
432 else
433 cg_flags = 0;
434 if (mp_ncpus % (cpu_cores * cpu_logical) != 0) {
435 printf("WARNING: Non-uniform processors.\n");
436 printf("WARNING: Using suboptimal topology.\n");
437 return (smp_topo_none());
438 }
439 /*
440 * No multi-core or hyper-threaded.
441 */
442 if (cpu_logical * cpu_cores == 1)
443 return (smp_topo_none());
444 /*
445 * Only HTT no multi-core.
446 */
447 if (cpu_logical > 1 && cpu_cores == 1)
448 return (smp_topo_1level(CG_SHARE_L1, cpu_logical, cg_flags));
449 /*
450 * Only multi-core no HTT.
451 */
452 if (cpu_cores > 1 && cpu_logical == 1)
453 return (smp_topo_1level(CG_SHARE_L2, cpu_cores, cg_flags));
454 /*
455 * Both HTT and multi-core.
456 */
457 return (smp_topo_2level(CG_SHARE_L2, cpu_cores,
458 CG_SHARE_L1, cpu_logical, cg_flags));
459 }
460
461
462 /*
463 * Calculate usable address in base memory for AP trampoline code.
464 */
465 u_int
466 mp_bootaddress(u_int basemem)
467 {
468
469 boot_address = trunc_page(basemem); /* round down to 4k boundary */
470 if ((basemem - boot_address) < bootMP_size)
471 boot_address -= PAGE_SIZE; /* not enough, lower by 4k */
472
473 return boot_address;
474 }
475
476 void
477 cpu_add(u_int apic_id, char boot_cpu)
478 {
479
480 if (apic_id > MAX_APIC_ID) {
481 panic("SMP: APIC ID %d too high", apic_id);
482 return;
483 }
484 KASSERT(cpu_info[apic_id].cpu_present == 0, ("CPU %d added twice",
485 apic_id));
486 cpu_info[apic_id].cpu_present = 1;
487 if (boot_cpu) {
488 KASSERT(boot_cpu_id == -1,
489 ("CPU %d claims to be BSP, but CPU %d already is", apic_id,
490 boot_cpu_id));
491 boot_cpu_id = apic_id;
492 cpu_info[apic_id].cpu_bsp = 1;
493 }
494 if (mp_ncpus < MAXCPU) {
495 mp_ncpus++;
496 mp_maxid = mp_ncpus - 1;
497 }
498 if (bootverbose)
499 printf("SMP: Added CPU %d (%s)\n", apic_id, boot_cpu ? "BSP" :
500 "AP");
501 }
502
503 void
504 cpu_mp_setmaxid(void)
505 {
506
507 /*
508 * mp_maxid should be already set by calls to cpu_add().
509 * Just sanity check its value here.
510 */
511 if (mp_ncpus == 0)
512 KASSERT(mp_maxid == 0,
513 ("%s: mp_ncpus is zero, but mp_maxid is not", __func__));
514 else if (mp_ncpus == 1)
515 mp_maxid = 0;
516 else
517 KASSERT(mp_maxid >= mp_ncpus - 1,
518 ("%s: counters out of sync: max %d, count %d", __func__,
519 mp_maxid, mp_ncpus));
520 }
521
522 int
523 cpu_mp_probe(void)
524 {
525
526 /*
527 * Always record BSP in CPU map so that the mbuf init code works
528 * correctly.
529 */
530 CPU_SETOF(0, &all_cpus);
531 if (mp_ncpus == 0) {
532 /*
533 * No CPUs were found, so this must be a UP system. Setup
534 * the variables to represent a system with a single CPU
535 * with an id of 0.
536 */
537 mp_ncpus = 1;
538 return (0);
539 }
540
541 /* At least one CPU was found. */
542 if (mp_ncpus == 1) {
543 /*
544 * One CPU was found, so this must be a UP system with
545 * an I/O APIC.
546 */
547 mp_maxid = 0;
548 return (0);
549 }
550
551 /* At least two CPUs were found. */
552 return (1);
553 }
554
555 /*
556 * Initialize the IPI handlers and start up the AP's.
557 */
558 void
559 cpu_mp_start(void)
560 {
561 int i;
562
563 /* Initialize the logical ID to APIC ID table. */
564 for (i = 0; i < MAXCPU; i++) {
565 cpu_apic_ids[i] = -1;
566 cpu_ipi_pending[i] = 0;
567 }
568
569 /* Install an inter-CPU IPI for TLB invalidation */
570 setidt(IPI_INVLTLB, IDTVEC(invltlb),
571 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
572 setidt(IPI_INVLPG, IDTVEC(invlpg),
573 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
574 setidt(IPI_INVLRNG, IDTVEC(invlrng),
575 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
576
577 /* Install an inter-CPU IPI for cache invalidation. */
578 setidt(IPI_INVLCACHE, IDTVEC(invlcache),
579 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
580
581 /* Install an inter-CPU IPI for lazy pmap release */
582 setidt(IPI_LAZYPMAP, IDTVEC(lazypmap),
583 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
584
585 /* Install an inter-CPU IPI for all-CPU rendezvous */
586 setidt(IPI_RENDEZVOUS, IDTVEC(rendezvous),
587 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
588
589 /* Install generic inter-CPU IPI handler */
590 setidt(IPI_BITMAP_VECTOR, IDTVEC(ipi_intr_bitmap_handler),
591 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
592
593 /* Install an inter-CPU IPI for CPU stop/restart */
594 setidt(IPI_STOP, IDTVEC(cpustop),
595 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
596
597 /* Install an inter-CPU IPI for CPU suspend/resume */
598 setidt(IPI_SUSPEND, IDTVEC(cpususpend),
599 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
600
601 /* Set boot_cpu_id if needed. */
602 if (boot_cpu_id == -1) {
603 boot_cpu_id = PCPU_GET(apic_id);
604 cpu_info[boot_cpu_id].cpu_bsp = 1;
605 } else
606 KASSERT(boot_cpu_id == PCPU_GET(apic_id),
607 ("BSP's APIC ID doesn't match boot_cpu_id"));
608
609 /* Probe logical/physical core configuration. */
610 topo_probe();
611
612 assign_cpu_ids();
613
614 /* Start each Application Processor */
615 start_all_aps();
616
617 set_interrupt_apic_ids();
618 }
619
620
621 /*
622 * Print various information about the SMP system hardware and setup.
623 */
624 void
625 cpu_mp_announce(void)
626 {
627 const char *hyperthread;
628 int i;
629
630 printf("FreeBSD/SMP: %d package(s) x %d core(s)",
631 mp_ncpus / (cpu_cores * cpu_logical), cpu_cores);
632 if (hyperthreading_cpus > 1)
633 printf(" x %d HTT threads", cpu_logical);
634 else if (cpu_logical > 1)
635 printf(" x %d SMT threads", cpu_logical);
636 printf("\n");
637
638 /* List active CPUs first. */
639 printf(" cpu0 (BSP): APIC ID: %2d\n", boot_cpu_id);
640 for (i = 1; i < mp_ncpus; i++) {
641 if (cpu_info[cpu_apic_ids[i]].cpu_hyperthread)
642 hyperthread = "/HT";
643 else
644 hyperthread = "";
645 printf(" cpu%d (AP%s): APIC ID: %2d\n", i, hyperthread,
646 cpu_apic_ids[i]);
647 }
648
649 /* List disabled CPUs last. */
650 for (i = 0; i <= MAX_APIC_ID; i++) {
651 if (!cpu_info[i].cpu_present || !cpu_info[i].cpu_disabled)
652 continue;
653 if (cpu_info[i].cpu_hyperthread)
654 hyperthread = "/HT";
655 else
656 hyperthread = "";
657 printf(" cpu (AP%s): APIC ID: %2d (disabled)\n", hyperthread,
658 i);
659 }
660 }
661
662 /*
663 * AP CPU's call this to initialize themselves.
664 */
665 void
666 init_secondary(void)
667 {
668 struct pcpu *pc;
669 vm_offset_t addr;
670 int gsel_tss;
671 int x, myid;
672 u_int cpuid, cr0;
673
674 /* bootAP is set in start_ap() to our ID. */
675 myid = bootAP;
676
677 /* Get per-cpu data */
678 pc = &__pcpu[myid];
679
680 /* prime data page for it to use */
681 pcpu_init(pc, myid, sizeof(struct pcpu));
682 dpcpu_init(dpcpu, myid);
683 pc->pc_apic_id = cpu_apic_ids[myid];
684 pc->pc_prvspace = pc;
685 pc->pc_curthread = 0;
686
687 intel_fix_cpuid();
688
689 gdt_segs[GPRIV_SEL].ssd_base = (int) pc;
690 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss;
691
692 for (x = 0; x < NGDT; x++) {
693 ssdtosd(&gdt_segs[x], &gdt[myid * NGDT + x].sd);
694 }
695
696 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
697 r_gdt.rd_base = (int) &gdt[myid * NGDT];
698 lgdt(&r_gdt); /* does magic intra-segment return */
699
700 lidt(&r_idt);
701
702 lldt(_default_ldt);
703 PCPU_SET(currentldt, _default_ldt);
704
705 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
706 gdt[myid * NGDT + GPROC0_SEL].sd.sd_type = SDT_SYS386TSS;
707 PCPU_SET(common_tss.tss_esp0, 0); /* not used until after switch */
708 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL));
709 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16);
710 PCPU_SET(tss_gdt, &gdt[myid * NGDT + GPROC0_SEL].sd);
711 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
712 ltr(gsel_tss);
713
714 PCPU_SET(fsgs_gdt, &gdt[myid * NGDT + GUFS_SEL].sd);
715
716 /*
717 * Set to a known state:
718 * Set by mpboot.s: CR0_PG, CR0_PE
719 * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM
720 */
721 cr0 = rcr0();
722 cr0 &= ~(CR0_CD | CR0_NW | CR0_EM);
723 load_cr0(cr0);
724 CHECK_WRITE(0x38, 5);
725
726 /* Disable local APIC just to be sure. */
727 lapic_disable();
728
729 /* signal our startup to the BSP. */
730 mp_naps++;
731 CHECK_WRITE(0x39, 6);
732
733 /* Spin until the BSP releases the AP's. */
734 while (!aps_ready)
735 ia32_pause();
736
737 /* BSP may have changed PTD while we were waiting */
738 invltlb();
739 for (addr = 0; addr < NKPT * NBPDR - 1; addr += PAGE_SIZE)
740 invlpg(addr);
741
742 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
743 lidt(&r_idt);
744 #endif
745
746 /* Initialize the PAT MSR if present. */
747 pmap_init_pat();
748
749 /* set up CPU registers and state */
750 cpu_setregs();
751
752 /* set up SSE/NX */
753 initializecpu();
754
755 /* set up FPU state on the AP */
756 npxinit(false);
757
758 if (cpu_ops.cpu_init)
759 cpu_ops.cpu_init();
760
761 /* A quick check from sanity claus */
762 cpuid = PCPU_GET(cpuid);
763 if (PCPU_GET(apic_id) != lapic_id()) {
764 printf("SMP: cpuid = %d\n", cpuid);
765 printf("SMP: actual apic_id = %d\n", lapic_id());
766 printf("SMP: correct apic_id = %d\n", PCPU_GET(apic_id));
767 panic("cpuid mismatch! boom!!");
768 }
769
770 /* Initialize curthread. */
771 KASSERT(PCPU_GET(idlethread) != NULL, ("no idle thread"));
772 PCPU_SET(curthread, PCPU_GET(idlethread));
773
774 mca_init();
775
776 mtx_lock_spin(&ap_boot_mtx);
777
778 /* Init local apic for irq's */
779 lapic_setup(1);
780
781 /* Set memory range attributes for this CPU to match the BSP */
782 mem_range_AP_init();
783
784 smp_cpus++;
785
786 CTR1(KTR_SMP, "SMP: AP CPU #%d Launched", cpuid);
787 printf("SMP: AP CPU #%d Launched!\n", cpuid);
788
789 /* Determine if we are a logical CPU. */
790 /* XXX Calculation depends on cpu_logical being a power of 2, e.g. 2 */
791 if (cpu_logical > 1 && PCPU_GET(apic_id) % cpu_logical != 0)
792 CPU_SET(cpuid, &logical_cpus_mask);
793
794 if (bootverbose)
795 lapic_dump("AP");
796
797 if (smp_cpus == mp_ncpus) {
798 /* enable IPI's, tlb shootdown, freezes etc */
799 atomic_store_rel_int(&smp_started, 1);
800 }
801
802 mtx_unlock_spin(&ap_boot_mtx);
803
804 /* Wait until all the AP's are up. */
805 while (smp_started == 0)
806 ia32_pause();
807
808 /* Start per-CPU event timers. */
809 cpu_initclocks_ap();
810
811 /* Enter the scheduler. */
812 sched_throw(NULL);
813
814 panic("scheduler returned us to %s", __func__);
815 /* NOTREACHED */
816 }
817
818 /*******************************************************************
819 * local functions and data
820 */
821
822 /*
823 * We tell the I/O APIC code about all the CPUs we want to receive
824 * interrupts. If we don't want certain CPUs to receive IRQs we
825 * can simply not tell the I/O APIC code about them in this function.
826 * We also do not tell it about the BSP since it tells itself about
827 * the BSP internally to work with UP kernels and on UP machines.
828 */
829 static void
830 set_interrupt_apic_ids(void)
831 {
832 u_int i, apic_id;
833
834 for (i = 0; i < MAXCPU; i++) {
835 apic_id = cpu_apic_ids[i];
836 if (apic_id == -1)
837 continue;
838 if (cpu_info[apic_id].cpu_bsp)
839 continue;
840 if (cpu_info[apic_id].cpu_disabled)
841 continue;
842
843 /* Don't let hyperthreads service interrupts. */
844 if (hyperthreading_cpus > 1 &&
845 apic_id % hyperthreading_cpus != 0)
846 continue;
847
848 intr_add_cpu(i);
849 }
850 }
851
852 /*
853 * Assign logical CPU IDs to local APICs.
854 */
855 static void
856 assign_cpu_ids(void)
857 {
858 u_int i;
859
860 TUNABLE_INT_FETCH("machdep.hyperthreading_allowed",
861 &hyperthreading_allowed);
862
863 /* Check for explicitly disabled CPUs. */
864 for (i = 0; i <= MAX_APIC_ID; i++) {
865 if (!cpu_info[i].cpu_present || cpu_info[i].cpu_bsp)
866 continue;
867
868 if (hyperthreading_cpus > 1 && i % hyperthreading_cpus != 0) {
869 cpu_info[i].cpu_hyperthread = 1;
870
871 /*
872 * Don't use HT CPU if it has been disabled by a
873 * tunable.
874 */
875 if (hyperthreading_allowed == 0) {
876 cpu_info[i].cpu_disabled = 1;
877 continue;
878 }
879 }
880
881 /* Don't use this CPU if it has been disabled by a tunable. */
882 if (resource_disabled("lapic", i)) {
883 cpu_info[i].cpu_disabled = 1;
884 continue;
885 }
886 }
887
888 if (hyperthreading_allowed == 0 && hyperthreading_cpus > 1) {
889 hyperthreading_cpus = 0;
890 cpu_logical = 1;
891 }
892
893 /*
894 * Assign CPU IDs to local APIC IDs and disable any CPUs
895 * beyond MAXCPU. CPU 0 is always assigned to the BSP.
896 *
897 * To minimize confusion for userland, we attempt to number
898 * CPUs such that all threads and cores in a package are
899 * grouped together. For now we assume that the BSP is always
900 * the first thread in a package and just start adding APs
901 * starting with the BSP's APIC ID.
902 */
903 mp_ncpus = 1;
904 cpu_apic_ids[0] = boot_cpu_id;
905 apic_cpuids[boot_cpu_id] = 0;
906 for (i = boot_cpu_id + 1; i != boot_cpu_id;
907 i == MAX_APIC_ID ? i = 0 : i++) {
908 if (!cpu_info[i].cpu_present || cpu_info[i].cpu_bsp ||
909 cpu_info[i].cpu_disabled)
910 continue;
911
912 if (mp_ncpus < MAXCPU) {
913 cpu_apic_ids[mp_ncpus] = i;
914 apic_cpuids[i] = mp_ncpus;
915 mp_ncpus++;
916 } else
917 cpu_info[i].cpu_disabled = 1;
918 }
919 KASSERT(mp_maxid >= mp_ncpus - 1,
920 ("%s: counters out of sync: max %d, count %d", __func__, mp_maxid,
921 mp_ncpus));
922 }
923
924 /*
925 * start each AP in our list
926 */
927 /* Lowest 1MB is already mapped: don't touch*/
928 #define TMPMAP_START 1
929 static int
930 start_all_aps(void)
931 {
932 #ifndef PC98
933 u_char mpbiosreason;
934 #endif
935 u_int32_t mpbioswarmvec;
936 int apic_id, cpu, i;
937
938 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
939
940 /* install the AP 1st level boot code */
941 install_ap_tramp();
942
943 /* save the current value of the warm-start vector */
944 mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
945 #ifndef PC98
946 outb(CMOS_REG, BIOS_RESET);
947 mpbiosreason = inb(CMOS_DATA);
948 #endif
949
950 /* set up temporary P==V mapping for AP boot */
951 /* XXX this is a hack, we should boot the AP on its own stack/PTD */
952 for (i = TMPMAP_START; i < NKPT; i++)
953 PTD[i] = PTD[KPTDI + i];
954 invltlb();
955
956 /* start each AP */
957 for (cpu = 1; cpu < mp_ncpus; cpu++) {
958 apic_id = cpu_apic_ids[cpu];
959
960 /* allocate and set up a boot stack data page */
961 bootstacks[cpu] =
962 (char *)kmem_malloc(kernel_arena, KSTACK_PAGES * PAGE_SIZE,
963 M_WAITOK | M_ZERO);
964 dpcpu = (void *)kmem_malloc(kernel_arena, DPCPU_SIZE,
965 M_WAITOK | M_ZERO);
966 /* setup a vector to our boot code */
967 *((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
968 *((volatile u_short *) WARMBOOT_SEG) = (boot_address >> 4);
969 #ifndef PC98
970 outb(CMOS_REG, BIOS_RESET);
971 outb(CMOS_DATA, BIOS_WARM); /* 'warm-start' */
972 #endif
973
974 bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 4;
975 bootAP = cpu;
976
977 /* attempt to start the Application Processor */
978 CHECK_INIT(99); /* setup checkpoints */
979 if (!start_ap(apic_id)) {
980 printf("AP #%d (PHY# %d) failed!\n", cpu, apic_id);
981 CHECK_PRINT("trace"); /* show checkpoints */
982 /* better panic as the AP may be running loose */
983 printf("panic y/n? [y] ");
984 if (cngetc() != 'n')
985 panic("bye-bye");
986 }
987 CHECK_PRINT("trace"); /* show checkpoints */
988
989 CPU_SET(cpu, &all_cpus); /* record AP in CPU map */
990 }
991
992 /* restore the warmstart vector */
993 *(u_int32_t *) WARMBOOT_OFF = mpbioswarmvec;
994
995 #ifndef PC98
996 outb(CMOS_REG, BIOS_RESET);
997 outb(CMOS_DATA, mpbiosreason);
998 #endif
999
1000 /* Undo V==P hack from above */
1001 for (i = TMPMAP_START; i < NKPT; i++)
1002 PTD[i] = 0;
1003 pmap_invalidate_range(kernel_pmap, 0, NKPT * NBPDR - 1);
1004
1005 /* number of APs actually started */
1006 return mp_naps;
1007 }
1008
1009 /*
1010 * load the 1st level AP boot code into base memory.
1011 */
1012
1013 /* targets for relocation */
1014 extern void bigJump(void);
1015 extern void bootCodeSeg(void);
1016 extern void bootDataSeg(void);
1017 extern void MPentry(void);
1018 extern u_int MP_GDT;
1019 extern u_int mp_gdtbase;
1020
1021 static void
1022 install_ap_tramp(void)
1023 {
1024 int x;
1025 int size = *(int *) ((u_long) & bootMP_size);
1026 vm_offset_t va = boot_address + KERNBASE;
1027 u_char *src = (u_char *) ((u_long) bootMP);
1028 u_char *dst = (u_char *) va;
1029 u_int boot_base = (u_int) bootMP;
1030 u_int8_t *dst8;
1031 u_int16_t *dst16;
1032 u_int32_t *dst32;
1033
1034 KASSERT (size <= PAGE_SIZE,
1035 ("'size' do not fit into PAGE_SIZE, as expected."));
1036 pmap_kenter(va, boot_address);
1037 pmap_invalidate_page (kernel_pmap, va);
1038 for (x = 0; x < size; ++x)
1039 *dst++ = *src++;
1040
1041 /*
1042 * modify addresses in code we just moved to basemem. unfortunately we
1043 * need fairly detailed info about mpboot.s for this to work. changes
1044 * to mpboot.s might require changes here.
1045 */
1046
1047 /* boot code is located in KERNEL space */
1048 dst = (u_char *) va;
1049
1050 /* modify the lgdt arg */
1051 dst32 = (u_int32_t *) (dst + ((u_int) & mp_gdtbase - boot_base));
1052 *dst32 = boot_address + ((u_int) & MP_GDT - boot_base);
1053
1054 /* modify the ljmp target for MPentry() */
1055 dst32 = (u_int32_t *) (dst + ((u_int) bigJump - boot_base) + 1);
1056 *dst32 = ((u_int) MPentry - KERNBASE);
1057
1058 /* modify the target for boot code segment */
1059 dst16 = (u_int16_t *) (dst + ((u_int) bootCodeSeg - boot_base));
1060 dst8 = (u_int8_t *) (dst16 + 1);
1061 *dst16 = (u_int) boot_address & 0xffff;
1062 *dst8 = ((u_int) boot_address >> 16) & 0xff;
1063
1064 /* modify the target for boot data segment */
1065 dst16 = (u_int16_t *) (dst + ((u_int) bootDataSeg - boot_base));
1066 dst8 = (u_int8_t *) (dst16 + 1);
1067 *dst16 = (u_int) boot_address & 0xffff;
1068 *dst8 = ((u_int) boot_address >> 16) & 0xff;
1069 }
1070
1071 /*
1072 * This function starts the AP (application processor) identified
1073 * by the APIC ID 'physicalCpu'. It does quite a "song and dance"
1074 * to accomplish this. This is necessary because of the nuances
1075 * of the different hardware we might encounter. It isn't pretty,
1076 * but it seems to work.
1077 */
1078 static int
1079 start_ap(int apic_id)
1080 {
1081 int vector, ms;
1082 int cpus;
1083
1084 /* calculate the vector */
1085 vector = (boot_address >> 12) & 0xff;
1086
1087 /* used as a watchpoint to signal AP startup */
1088 cpus = mp_naps;
1089
1090 ipi_startup(apic_id, vector);
1091
1092 /* Wait up to 5 seconds for it to start. */
1093 for (ms = 0; ms < 5000; ms++) {
1094 if (mp_naps > cpus)
1095 return 1; /* return SUCCESS */
1096 DELAY(1000);
1097 }
1098 return 0; /* return FAILURE */
1099 }
1100
1101 #ifdef COUNT_XINVLTLB_HITS
1102 u_int xhits_gbl[MAXCPU];
1103 u_int xhits_pg[MAXCPU];
1104 u_int xhits_rng[MAXCPU];
1105 static SYSCTL_NODE(_debug, OID_AUTO, xhits, CTLFLAG_RW, 0, "");
1106 SYSCTL_OPAQUE(_debug_xhits, OID_AUTO, global, CTLFLAG_RW, &xhits_gbl,
1107 sizeof(xhits_gbl), "IU", "");
1108 SYSCTL_OPAQUE(_debug_xhits, OID_AUTO, page, CTLFLAG_RW, &xhits_pg,
1109 sizeof(xhits_pg), "IU", "");
1110 SYSCTL_OPAQUE(_debug_xhits, OID_AUTO, range, CTLFLAG_RW, &xhits_rng,
1111 sizeof(xhits_rng), "IU", "");
1112
1113 u_int ipi_global;
1114 u_int ipi_page;
1115 u_int ipi_range;
1116 u_int ipi_range_size;
1117 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_global, CTLFLAG_RW, &ipi_global, 0, "");
1118 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_page, CTLFLAG_RW, &ipi_page, 0, "");
1119 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_range, CTLFLAG_RW, &ipi_range, 0, "");
1120 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_range_size, CTLFLAG_RW, &ipi_range_size,
1121 0, "");
1122
1123 u_int ipi_masked_global;
1124 u_int ipi_masked_page;
1125 u_int ipi_masked_range;
1126 u_int ipi_masked_range_size;
1127 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_masked_global, CTLFLAG_RW,
1128 &ipi_masked_global, 0, "");
1129 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_masked_page, CTLFLAG_RW,
1130 &ipi_masked_page, 0, "");
1131 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_masked_range, CTLFLAG_RW,
1132 &ipi_masked_range, 0, "");
1133 SYSCTL_INT(_debug_xhits, OID_AUTO, ipi_masked_range_size, CTLFLAG_RW,
1134 &ipi_masked_range_size, 0, "");
1135 #endif /* COUNT_XINVLTLB_HITS */
1136
1137 /*
1138 * Init and startup IPI.
1139 */
1140 void
1141 ipi_startup(int apic_id, int vector)
1142 {
1143
1144 /*
1145 * This attempts to follow the algorithm described in the
1146 * Intel Multiprocessor Specification v1.4 in section B.4.
1147 * For each IPI, we allow the local APIC ~20us to deliver the
1148 * IPI. If that times out, we panic.
1149 */
1150
1151 /*
1152 * first we do an INIT IPI: this INIT IPI might be run, resetting
1153 * and running the target CPU. OR this INIT IPI might be latched (P5
1154 * bug), CPU waiting for STARTUP IPI. OR this INIT IPI might be
1155 * ignored.
1156 */
1157 lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_LEVEL |
1158 APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT, apic_id);
1159 lapic_ipi_wait(100);
1160
1161 /* Explicitly deassert the INIT IPI. */
1162 lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_LEVEL |
1163 APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT,
1164 apic_id);
1165
1166 DELAY(10000); /* wait ~10mS */
1167
1168 /*
1169 * next we do a STARTUP IPI: the previous INIT IPI might still be
1170 * latched, (P5 bug) this 1st STARTUP would then terminate
1171 * immediately, and the previously started INIT IPI would continue. OR
1172 * the previous INIT IPI has already run. and this STARTUP IPI will
1173 * run. OR the previous INIT IPI was ignored. and this STARTUP IPI
1174 * will run.
1175 */
1176 lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE |
1177 APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP |
1178 vector, apic_id);
1179 if (!lapic_ipi_wait(100))
1180 panic("Failed to deliver first STARTUP IPI to APIC %d",
1181 apic_id);
1182 DELAY(200); /* wait ~200uS */
1183
1184 /*
1185 * finally we do a 2nd STARTUP IPI: this 2nd STARTUP IPI should run IF
1186 * the previous STARTUP IPI was cancelled by a latched INIT IPI. OR
1187 * this STARTUP IPI will be ignored, as only ONE STARTUP IPI is
1188 * recognized after hardware RESET or INIT IPI.
1189 */
1190 lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE |
1191 APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP |
1192 vector, apic_id);
1193 if (!lapic_ipi_wait(100))
1194 panic("Failed to deliver second STARTUP IPI to APIC %d",
1195 apic_id);
1196
1197 DELAY(200); /* wait ~200uS */
1198 }
1199
1200 /*
1201 * Send an IPI to specified CPU handling the bitmap logic.
1202 */
1203 static void
1204 ipi_send_cpu(int cpu, u_int ipi)
1205 {
1206 u_int bitmap, old_pending, new_pending;
1207
1208 KASSERT(cpu_apic_ids[cpu] != -1, ("IPI to non-existent CPU %d", cpu));
1209
1210 if (IPI_IS_BITMAPED(ipi)) {
1211 bitmap = 1 << ipi;
1212 ipi = IPI_BITMAP_VECTOR;
1213 do {
1214 old_pending = cpu_ipi_pending[cpu];
1215 new_pending = old_pending | bitmap;
1216 } while (!atomic_cmpset_int(&cpu_ipi_pending[cpu],
1217 old_pending, new_pending));
1218 if (old_pending)
1219 return;
1220 }
1221 cpu_ops.ipi_vectored(ipi, cpu_apic_ids[cpu]);
1222 }
1223
1224 /*
1225 * Flush the TLB on all other CPU's
1226 */
1227 static void
1228 smp_tlb_shootdown(u_int vector, vm_offset_t addr1, vm_offset_t addr2)
1229 {
1230 u_int ncpu;
1231
1232 ncpu = mp_ncpus - 1; /* does not shootdown self */
1233 if (ncpu < 1)
1234 return; /* no other cpus */
1235 if (!(read_eflags() & PSL_I))
1236 panic("%s: interrupts disabled", __func__);
1237 mtx_lock_spin(&smp_ipi_mtx);
1238 smp_tlb_addr1 = addr1;
1239 smp_tlb_addr2 = addr2;
1240 atomic_store_rel_int(&smp_tlb_wait, 0);
1241 ipi_all_but_self(vector);
1242 while (smp_tlb_wait < ncpu)
1243 ia32_pause();
1244 mtx_unlock_spin(&smp_ipi_mtx);
1245 }
1246
1247 static void
1248 smp_targeted_tlb_shootdown(cpuset_t mask, u_int vector, vm_offset_t addr1, vm_offset_t addr2)
1249 {
1250 int cpu, ncpu, othercpus;
1251
1252 othercpus = mp_ncpus - 1;
1253 if (CPU_ISFULLSET(&mask)) {
1254 if (othercpus < 1)
1255 return;
1256 } else {
1257 CPU_CLR(PCPU_GET(cpuid), &mask);
1258 if (CPU_EMPTY(&mask))
1259 return;
1260 }
1261 if (!(read_eflags() & PSL_I))
1262 panic("%s: interrupts disabled", __func__);
1263 mtx_lock_spin(&smp_ipi_mtx);
1264 smp_tlb_addr1 = addr1;
1265 smp_tlb_addr2 = addr2;
1266 atomic_store_rel_int(&smp_tlb_wait, 0);
1267 if (CPU_ISFULLSET(&mask)) {
1268 ncpu = othercpus;
1269 ipi_all_but_self(vector);
1270 } else {
1271 ncpu = 0;
1272 while ((cpu = CPU_FFS(&mask)) != 0) {
1273 cpu--;
1274 CPU_CLR(cpu, &mask);
1275 CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu,
1276 vector);
1277 ipi_send_cpu(cpu, vector);
1278 ncpu++;
1279 }
1280 }
1281 while (smp_tlb_wait < ncpu)
1282 ia32_pause();
1283 mtx_unlock_spin(&smp_ipi_mtx);
1284 }
1285
1286 void
1287 smp_cache_flush(void)
1288 {
1289
1290 if (smp_started)
1291 smp_tlb_shootdown(IPI_INVLCACHE, 0, 0);
1292 }
1293
1294 void
1295 smp_invltlb(void)
1296 {
1297
1298 if (smp_started) {
1299 smp_tlb_shootdown(IPI_INVLTLB, 0, 0);
1300 #ifdef COUNT_XINVLTLB_HITS
1301 ipi_global++;
1302 #endif
1303 }
1304 }
1305
1306 void
1307 smp_invlpg(vm_offset_t addr)
1308 {
1309
1310 if (smp_started) {
1311 smp_tlb_shootdown(IPI_INVLPG, addr, 0);
1312 #ifdef COUNT_XINVLTLB_HITS
1313 ipi_page++;
1314 #endif
1315 }
1316 }
1317
1318 void
1319 smp_invlpg_range(vm_offset_t addr1, vm_offset_t addr2)
1320 {
1321
1322 if (smp_started) {
1323 smp_tlb_shootdown(IPI_INVLRNG, addr1, addr2);
1324 #ifdef COUNT_XINVLTLB_HITS
1325 ipi_range++;
1326 ipi_range_size += (addr2 - addr1) / PAGE_SIZE;
1327 #endif
1328 }
1329 }
1330
1331 void
1332 smp_masked_invltlb(cpuset_t mask)
1333 {
1334
1335 if (smp_started) {
1336 smp_targeted_tlb_shootdown(mask, IPI_INVLTLB, 0, 0);
1337 #ifdef COUNT_XINVLTLB_HITS
1338 ipi_masked_global++;
1339 #endif
1340 }
1341 }
1342
1343 void
1344 smp_masked_invlpg(cpuset_t mask, vm_offset_t addr)
1345 {
1346
1347 if (smp_started) {
1348 smp_targeted_tlb_shootdown(mask, IPI_INVLPG, addr, 0);
1349 #ifdef COUNT_XINVLTLB_HITS
1350 ipi_masked_page++;
1351 #endif
1352 }
1353 }
1354
1355 void
1356 smp_masked_invlpg_range(cpuset_t mask, vm_offset_t addr1, vm_offset_t addr2)
1357 {
1358
1359 if (smp_started) {
1360 smp_targeted_tlb_shootdown(mask, IPI_INVLRNG, addr1, addr2);
1361 #ifdef COUNT_XINVLTLB_HITS
1362 ipi_masked_range++;
1363 ipi_masked_range_size += (addr2 - addr1) / PAGE_SIZE;
1364 #endif
1365 }
1366 }
1367
1368 void
1369 ipi_bitmap_handler(struct trapframe frame)
1370 {
1371 struct trapframe *oldframe;
1372 struct thread *td;
1373 int cpu = PCPU_GET(cpuid);
1374 u_int ipi_bitmap;
1375
1376 critical_enter();
1377 td = curthread;
1378 td->td_intr_nesting_level++;
1379 oldframe = td->td_intr_frame;
1380 td->td_intr_frame = &frame;
1381 ipi_bitmap = atomic_readandclear_int(&cpu_ipi_pending[cpu]);
1382 if (ipi_bitmap & (1 << IPI_PREEMPT)) {
1383 #ifdef COUNT_IPIS
1384 (*ipi_preempt_counts[cpu])++;
1385 #endif
1386 sched_preempt(td);
1387 }
1388 if (ipi_bitmap & (1 << IPI_AST)) {
1389 #ifdef COUNT_IPIS
1390 (*ipi_ast_counts[cpu])++;
1391 #endif
1392 /* Nothing to do for AST */
1393 }
1394 if (ipi_bitmap & (1 << IPI_HARDCLOCK)) {
1395 #ifdef COUNT_IPIS
1396 (*ipi_hardclock_counts[cpu])++;
1397 #endif
1398 hardclockintr();
1399 }
1400 td->td_intr_frame = oldframe;
1401 td->td_intr_nesting_level--;
1402 critical_exit();
1403 }
1404
1405 /*
1406 * send an IPI to a set of cpus.
1407 */
1408 void
1409 ipi_selected(cpuset_t cpus, u_int ipi)
1410 {
1411 int cpu;
1412
1413 /*
1414 * IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
1415 * of help in order to understand what is the source.
1416 * Set the mask of receiving CPUs for this purpose.
1417 */
1418 if (ipi == IPI_STOP_HARD)
1419 CPU_OR_ATOMIC(&ipi_nmi_pending, &cpus);
1420
1421 while ((cpu = CPU_FFS(&cpus)) != 0) {
1422 cpu--;
1423 CPU_CLR(cpu, &cpus);
1424 CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
1425 ipi_send_cpu(cpu, ipi);
1426 }
1427 }
1428
1429 /*
1430 * send an IPI to a specific CPU.
1431 */
1432 void
1433 ipi_cpu(int cpu, u_int ipi)
1434 {
1435
1436 /*
1437 * IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
1438 * of help in order to understand what is the source.
1439 * Set the mask of receiving CPUs for this purpose.
1440 */
1441 if (ipi == IPI_STOP_HARD)
1442 CPU_SET_ATOMIC(cpu, &ipi_nmi_pending);
1443
1444 CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
1445 ipi_send_cpu(cpu, ipi);
1446 }
1447
1448 /*
1449 * send an IPI to all CPUs EXCEPT myself
1450 */
1451 void
1452 ipi_all_but_self(u_int ipi)
1453 {
1454 cpuset_t other_cpus;
1455
1456 other_cpus = all_cpus;
1457 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
1458 if (IPI_IS_BITMAPED(ipi)) {
1459 ipi_selected(other_cpus, ipi);
1460 return;
1461 }
1462
1463 /*
1464 * IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
1465 * of help in order to understand what is the source.
1466 * Set the mask of receiving CPUs for this purpose.
1467 */
1468 if (ipi == IPI_STOP_HARD)
1469 CPU_OR_ATOMIC(&ipi_nmi_pending, &other_cpus);
1470
1471 CTR2(KTR_SMP, "%s: ipi: %x", __func__, ipi);
1472 cpu_ops.ipi_vectored(ipi, APIC_IPI_DEST_OTHERS);
1473 }
1474
1475 int
1476 ipi_nmi_handler()
1477 {
1478 u_int cpuid;
1479
1480 /*
1481 * As long as there is not a simple way to know about a NMI's
1482 * source, if the bitmask for the current CPU is present in
1483 * the global pending bitword an IPI_STOP_HARD has been issued
1484 * and should be handled.
1485 */
1486 cpuid = PCPU_GET(cpuid);
1487 if (!CPU_ISSET(cpuid, &ipi_nmi_pending))
1488 return (1);
1489
1490 CPU_CLR_ATOMIC(cpuid, &ipi_nmi_pending);
1491 cpustop_handler();
1492 return (0);
1493 }
1494
1495 /*
1496 * Handle an IPI_STOP by saving our current context and spinning until we
1497 * are resumed.
1498 */
1499 void
1500 cpustop_handler(void)
1501 {
1502 u_int cpu;
1503
1504 cpu = PCPU_GET(cpuid);
1505
1506 savectx(&stoppcbs[cpu]);
1507
1508 /* Indicate that we are stopped */
1509 CPU_SET_ATOMIC(cpu, &stopped_cpus);
1510
1511 /* Wait for restart */
1512 while (!CPU_ISSET(cpu, &started_cpus))
1513 ia32_pause();
1514
1515 CPU_CLR_ATOMIC(cpu, &started_cpus);
1516 CPU_CLR_ATOMIC(cpu, &stopped_cpus);
1517
1518 if (cpu == 0 && cpustop_restartfunc != NULL) {
1519 cpustop_restartfunc();
1520 cpustop_restartfunc = NULL;
1521 }
1522 }
1523
1524 /*
1525 * Handle an IPI_SUSPEND by saving our current context and spinning until we
1526 * are resumed.
1527 */
1528 void
1529 cpususpend_handler(void)
1530 {
1531 u_int cpu;
1532
1533 mtx_assert(&smp_ipi_mtx, MA_NOTOWNED);
1534
1535 cpu = PCPU_GET(cpuid);
1536 if (savectx(&susppcbs[cpu]->sp_pcb)) {
1537 npxsuspend(susppcbs[cpu]->sp_fpususpend);
1538 wbinvd();
1539 CPU_SET_ATOMIC(cpu, &suspended_cpus);
1540 } else {
1541 npxresume(susppcbs[cpu]->sp_fpususpend);
1542 pmap_init_pat();
1543 initializecpu();
1544 PCPU_SET(switchtime, 0);
1545 PCPU_SET(switchticks, ticks);
1546
1547 /* Indicate that we are resumed */
1548 CPU_CLR_ATOMIC(cpu, &suspended_cpus);
1549 }
1550
1551 /* Wait for resume */
1552 while (!CPU_ISSET(cpu, &started_cpus))
1553 ia32_pause();
1554
1555 if (cpu_ops.cpu_resume)
1556 cpu_ops.cpu_resume();
1557
1558 /* Resume MCA and local APIC */
1559 mca_resume();
1560 lapic_setup(0);
1561
1562 /* Indicate that we are resumed */
1563 CPU_CLR_ATOMIC(cpu, &suspended_cpus);
1564 CPU_CLR_ATOMIC(cpu, &started_cpus);
1565 }
1566
1567 /*
1568 * Handlers for TLB related IPIs
1569 */
1570 void
1571 invltlb_handler(void)
1572 {
1573 uint64_t cr3;
1574 #ifdef COUNT_XINVLTLB_HITS
1575 xhits_gbl[PCPU_GET(cpuid)]++;
1576 #endif /* COUNT_XINVLTLB_HITS */
1577 #ifdef COUNT_IPIS
1578 (*ipi_invltlb_counts[PCPU_GET(cpuid)])++;
1579 #endif /* COUNT_IPIS */
1580
1581 cr3 = rcr3();
1582 load_cr3(cr3);
1583 atomic_add_int(&smp_tlb_wait, 1);
1584 }
1585
1586 void
1587 invlpg_handler(void)
1588 {
1589 #ifdef COUNT_XINVLTLB_HITS
1590 xhits_pg[PCPU_GET(cpuid)]++;
1591 #endif /* COUNT_XINVLTLB_HITS */
1592 #ifdef COUNT_IPIS
1593 (*ipi_invlpg_counts[PCPU_GET(cpuid)])++;
1594 #endif /* COUNT_IPIS */
1595
1596 invlpg(smp_tlb_addr1);
1597
1598 atomic_add_int(&smp_tlb_wait, 1);
1599 }
1600
1601 void
1602 invlrng_handler(void)
1603 {
1604 vm_offset_t addr;
1605 #ifdef COUNT_XINVLTLB_HITS
1606 xhits_rng[PCPU_GET(cpuid)]++;
1607 #endif /* COUNT_XINVLTLB_HITS */
1608 #ifdef COUNT_IPIS
1609 (*ipi_invlrng_counts[PCPU_GET(cpuid)])++;
1610 #endif /* COUNT_IPIS */
1611
1612 addr = smp_tlb_addr1;
1613 do {
1614 invlpg(addr);
1615 addr += PAGE_SIZE;
1616 } while (addr < smp_tlb_addr2);
1617
1618 atomic_add_int(&smp_tlb_wait, 1);
1619 }
1620
1621 void
1622 invlcache_handler(void)
1623 {
1624 #ifdef COUNT_IPIS
1625 (*ipi_invlcache_counts[PCPU_GET(cpuid)])++;
1626 #endif /* COUNT_IPIS */
1627
1628 wbinvd();
1629 atomic_add_int(&smp_tlb_wait, 1);
1630 }
1631
1632 /*
1633 * This is called once the rest of the system is up and running and we're
1634 * ready to let the AP's out of the pen.
1635 */
1636 static void
1637 release_aps(void *dummy __unused)
1638 {
1639
1640 if (mp_ncpus == 1)
1641 return;
1642 atomic_store_rel_int(&aps_ready, 1);
1643 while (smp_started == 0)
1644 ia32_pause();
1645 }
1646 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, release_aps, NULL);
1647
1648 #ifdef COUNT_IPIS
1649 /*
1650 * Setup interrupt counters for IPI handlers.
1651 */
1652 static void
1653 mp_ipi_intrcnt(void *dummy)
1654 {
1655 char buf[64];
1656 int i;
1657
1658 CPU_FOREACH(i) {
1659 snprintf(buf, sizeof(buf), "cpu%d:invltlb", i);
1660 intrcnt_add(buf, &ipi_invltlb_counts[i]);
1661 snprintf(buf, sizeof(buf), "cpu%d:invlrng", i);
1662 intrcnt_add(buf, &ipi_invlrng_counts[i]);
1663 snprintf(buf, sizeof(buf), "cpu%d:invlpg", i);
1664 intrcnt_add(buf, &ipi_invlpg_counts[i]);
1665 snprintf(buf, sizeof(buf), "cpu%d:invlcache", i);
1666 intrcnt_add(buf, &ipi_invlcache_counts[i]);
1667 snprintf(buf, sizeof(buf), "cpu%d:preempt", i);
1668 intrcnt_add(buf, &ipi_preempt_counts[i]);
1669 snprintf(buf, sizeof(buf), "cpu%d:ast", i);
1670 intrcnt_add(buf, &ipi_ast_counts[i]);
1671 snprintf(buf, sizeof(buf), "cpu%d:rendezvous", i);
1672 intrcnt_add(buf, &ipi_rendezvous_counts[i]);
1673 snprintf(buf, sizeof(buf), "cpu%d:lazypmap", i);
1674 intrcnt_add(buf, &ipi_lazypmap_counts[i]);
1675 snprintf(buf, sizeof(buf), "cpu%d:hardclock", i);
1676 intrcnt_add(buf, &ipi_hardclock_counts[i]);
1677 }
1678 }
1679 SYSINIT(mp_ipi_intrcnt, SI_SUB_INTR, SI_ORDER_MIDDLE, mp_ipi_intrcnt, NULL);
1680 #endif
Cache object: e1a867180e15f2b3109bfa187f90adf7
|