FreeBSD/Linux Kernel Cross Reference
sys/x86/xen/xen_apic.c
1 /*
2 * Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
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. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/bus.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/proc.h>
35 #include <sys/smp.h>
36 #include <sys/systm.h>
37
38 #include <vm/vm.h>
39 #include <vm/pmap.h>
40
41 #include <machine/cpufunc.h>
42 #include <machine/cpu.h>
43 #include <machine/intr_machdep.h>
44 #include <machine/md_var.h>
45 #include <machine/smp.h>
46
47 #include <x86/apicreg.h>
48 #include <x86/apicvar.h>
49
50 #include <xen/xen-os.h>
51 #include <xen/features.h>
52 #include <xen/gnttab.h>
53 #include <xen/hypervisor.h>
54 #include <xen/hvm.h>
55 #include <xen/xen_intr.h>
56
57 #include <xen/interface/vcpu.h>
58
59 /*--------------------------------- Macros -----------------------------------*/
60
61 #define XEN_APIC_UNSUPPORTED \
62 panic("%s: not available in Xen PV port.", __func__)
63
64
65 /*--------------------------- Forward Declarations ---------------------------*/
66 #ifdef SMP
67 static driver_filter_t xen_smp_rendezvous_action;
68 static driver_filter_t xen_invltlb;
69 static driver_filter_t xen_invlpg;
70 static driver_filter_t xen_invlrng;
71 static driver_filter_t xen_invlcache;
72 static driver_filter_t xen_ipi_bitmap_handler;
73 static driver_filter_t xen_cpustop_handler;
74 static driver_filter_t xen_cpususpend_handler;
75 #endif
76
77 /*---------------------------------- Macros ----------------------------------*/
78 #define IPI_TO_IDX(ipi) ((ipi) - APIC_IPI_INTS)
79
80 /*--------------------------------- Xen IPIs ---------------------------------*/
81 #ifdef SMP
82 struct xen_ipi_handler
83 {
84 driver_filter_t *filter;
85 const char *description;
86 };
87
88 static struct xen_ipi_handler xen_ipis[] =
89 {
90 [IPI_TO_IDX(IPI_RENDEZVOUS)] = { xen_smp_rendezvous_action, "r" },
91 [IPI_TO_IDX(IPI_INVLTLB)] = { xen_invltlb, "itlb"},
92 [IPI_TO_IDX(IPI_INVLPG)] = { xen_invlpg, "ipg" },
93 [IPI_TO_IDX(IPI_INVLRNG)] = { xen_invlrng, "irg" },
94 [IPI_TO_IDX(IPI_INVLCACHE)] = { xen_invlcache, "ic" },
95 [IPI_TO_IDX(IPI_BITMAP_VECTOR)] = { xen_ipi_bitmap_handler, "b" },
96 [IPI_TO_IDX(IPI_STOP)] = { xen_cpustop_handler, "st" },
97 [IPI_TO_IDX(IPI_SUSPEND)] = { xen_cpususpend_handler, "sp" },
98 };
99 #endif
100
101 /*------------------------------- Per-CPU Data -------------------------------*/
102 #ifdef SMP
103 DPCPU_DEFINE(xen_intr_handle_t, ipi_handle[nitems(xen_ipis)]);
104 #endif
105
106 /*------------------------------- Xen PV APIC --------------------------------*/
107
108 static void
109 xen_pv_lapic_create(u_int apic_id, int boot_cpu)
110 {
111 #ifdef SMP
112 cpu_add(apic_id, boot_cpu);
113 #endif
114 }
115
116 static void
117 xen_pv_lapic_init(vm_paddr_t addr)
118 {
119
120 }
121
122 static void
123 xen_pv_lapic_setup(int boot)
124 {
125
126 }
127
128 static void
129 xen_pv_lapic_dump(const char *str)
130 {
131
132 printf("cpu%d %s XEN PV LAPIC\n", PCPU_GET(cpuid), str);
133 }
134
135 static void
136 xen_pv_lapic_disable(void)
137 {
138
139 }
140
141 static bool
142 xen_pv_lapic_is_x2apic(void)
143 {
144
145 return (false);
146 }
147
148 static void
149 xen_pv_lapic_eoi(void)
150 {
151
152 XEN_APIC_UNSUPPORTED;
153 }
154
155 static int
156 xen_pv_lapic_id(void)
157 {
158
159 return (PCPU_GET(apic_id));
160 }
161
162 static int
163 xen_pv_lapic_intr_pending(u_int vector)
164 {
165
166 XEN_APIC_UNSUPPORTED;
167 return (0);
168 }
169
170 static u_int
171 xen_pv_apic_cpuid(u_int apic_id)
172 {
173 #ifdef SMP
174 return (apic_cpuids[apic_id]);
175 #else
176 return (0);
177 #endif
178 }
179
180 static u_int
181 xen_pv_apic_alloc_vector(u_int apic_id, u_int irq)
182 {
183
184 XEN_APIC_UNSUPPORTED;
185 return (0);
186 }
187
188 static u_int
189 xen_pv_apic_alloc_vectors(u_int apic_id, u_int *irqs, u_int count, u_int align)
190 {
191
192 XEN_APIC_UNSUPPORTED;
193 return (0);
194 }
195
196 static void
197 xen_pv_apic_disable_vector(u_int apic_id, u_int vector)
198 {
199
200 XEN_APIC_UNSUPPORTED;
201 }
202
203 static void
204 xen_pv_apic_enable_vector(u_int apic_id, u_int vector)
205 {
206
207 XEN_APIC_UNSUPPORTED;
208 }
209
210 static void
211 xen_pv_apic_free_vector(u_int apic_id, u_int vector, u_int irq)
212 {
213
214 XEN_APIC_UNSUPPORTED;
215 }
216
217 static void
218 xen_pv_lapic_set_logical_id(u_int apic_id, u_int cluster, u_int cluster_id)
219 {
220
221 XEN_APIC_UNSUPPORTED;
222 }
223
224 static int
225 xen_pv_lapic_enable_pmc(void)
226 {
227
228 XEN_APIC_UNSUPPORTED;
229 return (0);
230 }
231
232 static void
233 xen_pv_lapic_disable_pmc(void)
234 {
235
236 XEN_APIC_UNSUPPORTED;
237 }
238
239 static void
240 xen_pv_lapic_reenable_pmc(void)
241 {
242
243 XEN_APIC_UNSUPPORTED;
244 }
245
246 static void
247 xen_pv_lapic_enable_cmc(void)
248 {
249
250 }
251
252 #ifdef SMP
253 static void
254 xen_pv_lapic_ipi_raw(register_t icrlo, u_int dest)
255 {
256
257 XEN_APIC_UNSUPPORTED;
258 }
259
260 #define PCPU_ID_GET(id, field) (pcpu_find(id)->pc_##field)
261 static void
262 send_nmi(int dest)
263 {
264 unsigned int cpu;
265
266 /*
267 * NMIs are not routed over event channels, and instead delivered as on
268 * native using the exception vector (#2). Triggering them can be done
269 * using the local APIC, or an hypercall as a shortcut like it's done
270 * below.
271 */
272 switch(dest) {
273 case APIC_IPI_DEST_SELF:
274 HYPERVISOR_vcpu_op(VCPUOP_send_nmi, PCPU_GET(vcpu_id), NULL);
275 break;
276 case APIC_IPI_DEST_ALL:
277 CPU_FOREACH(cpu)
278 HYPERVISOR_vcpu_op(VCPUOP_send_nmi,
279 PCPU_ID_GET(cpu, vcpu_id), NULL);
280 break;
281 case APIC_IPI_DEST_OTHERS:
282 CPU_FOREACH(cpu)
283 if (cpu != PCPU_GET(cpuid))
284 HYPERVISOR_vcpu_op(VCPUOP_send_nmi,
285 PCPU_ID_GET(cpu, vcpu_id), NULL);
286 break;
287 default:
288 HYPERVISOR_vcpu_op(VCPUOP_send_nmi,
289 PCPU_ID_GET(apic_cpuid(dest), vcpu_id), NULL);
290 break;
291 }
292 }
293 #undef PCPU_ID_GET
294
295 static void
296 xen_pv_lapic_ipi_vectored(u_int vector, int dest)
297 {
298 xen_intr_handle_t *ipi_handle;
299 int ipi_idx, to_cpu, self;
300
301 if (vector >= IPI_NMI_FIRST) {
302 send_nmi(dest);
303 return;
304 }
305
306 ipi_idx = IPI_TO_IDX(vector);
307 if (ipi_idx >= nitems(xen_ipis))
308 panic("IPI out of range");
309
310 switch(dest) {
311 case APIC_IPI_DEST_SELF:
312 ipi_handle = DPCPU_GET(ipi_handle);
313 xen_intr_signal(ipi_handle[ipi_idx]);
314 break;
315 case APIC_IPI_DEST_ALL:
316 CPU_FOREACH(to_cpu) {
317 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
318 xen_intr_signal(ipi_handle[ipi_idx]);
319 }
320 break;
321 case APIC_IPI_DEST_OTHERS:
322 self = PCPU_GET(cpuid);
323 CPU_FOREACH(to_cpu) {
324 if (to_cpu != self) {
325 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
326 xen_intr_signal(ipi_handle[ipi_idx]);
327 }
328 }
329 break;
330 default:
331 to_cpu = apic_cpuid(dest);
332 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
333 xen_intr_signal(ipi_handle[ipi_idx]);
334 break;
335 }
336 }
337
338 static int
339 xen_pv_lapic_ipi_wait(int delay)
340 {
341
342 XEN_APIC_UNSUPPORTED;
343 return (0);
344 }
345 #endif /* SMP */
346
347 static int
348 xen_pv_lapic_ipi_alloc(inthand_t *ipifunc)
349 {
350
351 XEN_APIC_UNSUPPORTED;
352 return (-1);
353 }
354
355 static void
356 xen_pv_lapic_ipi_free(int vector)
357 {
358
359 XEN_APIC_UNSUPPORTED;
360 }
361
362 static int
363 xen_pv_lapic_set_lvt_mask(u_int apic_id, u_int lvt, u_char masked)
364 {
365
366 XEN_APIC_UNSUPPORTED;
367 return (0);
368 }
369
370 static int
371 xen_pv_lapic_set_lvt_mode(u_int apic_id, u_int lvt, uint32_t mode)
372 {
373
374 XEN_APIC_UNSUPPORTED;
375 return (0);
376 }
377
378 static int
379 xen_pv_lapic_set_lvt_polarity(u_int apic_id, u_int lvt, enum intr_polarity pol)
380 {
381
382 XEN_APIC_UNSUPPORTED;
383 return (0);
384 }
385
386 static int
387 xen_pv_lapic_set_lvt_triggermode(u_int apic_id, u_int lvt,
388 enum intr_trigger trigger)
389 {
390
391 XEN_APIC_UNSUPPORTED;
392 return (0);
393 }
394
395 /* Xen apic_ops implementation */
396 struct apic_ops xen_apic_ops = {
397 .create = xen_pv_lapic_create,
398 .init = xen_pv_lapic_init,
399 .xapic_mode = xen_pv_lapic_disable,
400 .is_x2apic = xen_pv_lapic_is_x2apic,
401 .setup = xen_pv_lapic_setup,
402 .dump = xen_pv_lapic_dump,
403 .disable = xen_pv_lapic_disable,
404 .eoi = xen_pv_lapic_eoi,
405 .id = xen_pv_lapic_id,
406 .intr_pending = xen_pv_lapic_intr_pending,
407 .set_logical_id = xen_pv_lapic_set_logical_id,
408 .cpuid = xen_pv_apic_cpuid,
409 .alloc_vector = xen_pv_apic_alloc_vector,
410 .alloc_vectors = xen_pv_apic_alloc_vectors,
411 .enable_vector = xen_pv_apic_enable_vector,
412 .disable_vector = xen_pv_apic_disable_vector,
413 .free_vector = xen_pv_apic_free_vector,
414 .enable_pmc = xen_pv_lapic_enable_pmc,
415 .disable_pmc = xen_pv_lapic_disable_pmc,
416 .reenable_pmc = xen_pv_lapic_reenable_pmc,
417 .enable_cmc = xen_pv_lapic_enable_cmc,
418 #ifdef SMP
419 .ipi_raw = xen_pv_lapic_ipi_raw,
420 .ipi_vectored = xen_pv_lapic_ipi_vectored,
421 .ipi_wait = xen_pv_lapic_ipi_wait,
422 #endif
423 .ipi_alloc = xen_pv_lapic_ipi_alloc,
424 .ipi_free = xen_pv_lapic_ipi_free,
425 .set_lvt_mask = xen_pv_lapic_set_lvt_mask,
426 .set_lvt_mode = xen_pv_lapic_set_lvt_mode,
427 .set_lvt_polarity = xen_pv_lapic_set_lvt_polarity,
428 .set_lvt_triggermode = xen_pv_lapic_set_lvt_triggermode,
429 };
430
431 #ifdef SMP
432 /*---------------------------- XEN PV IPI Handlers ---------------------------*/
433 /*
434 * These are C clones of the ASM functions found in apic_vector.
435 */
436 static int
437 xen_ipi_bitmap_handler(void *arg)
438 {
439 struct trapframe *frame;
440
441 frame = arg;
442 ipi_bitmap_handler(*frame);
443 return (FILTER_HANDLED);
444 }
445
446 static int
447 xen_smp_rendezvous_action(void *arg)
448 {
449 #ifdef COUNT_IPIS
450 (*ipi_rendezvous_counts[PCPU_GET(cpuid)])++;
451 #endif /* COUNT_IPIS */
452
453 smp_rendezvous_action();
454 return (FILTER_HANDLED);
455 }
456
457 static int
458 xen_invltlb(void *arg)
459 {
460
461 invltlb_handler();
462 return (FILTER_HANDLED);
463 }
464
465 #ifdef __amd64__
466 static int
467 xen_invltlb_invpcid(void *arg)
468 {
469
470 invltlb_invpcid_handler();
471 return (FILTER_HANDLED);
472 }
473
474 static int
475 xen_invltlb_pcid(void *arg)
476 {
477
478 invltlb_pcid_handler();
479 return (FILTER_HANDLED);
480 }
481
482 static int
483 xen_invltlb_invpcid_pti(void *arg)
484 {
485
486 invltlb_invpcid_pti_handler();
487 return (FILTER_HANDLED);
488 }
489
490 static int
491 xen_invlpg_invpcid_handler(void *arg)
492 {
493
494 invlpg_invpcid_handler();
495 return (FILTER_HANDLED);
496 }
497
498 static int
499 xen_invlpg_pcid_handler(void *arg)
500 {
501
502 invlpg_pcid_handler();
503 return (FILTER_HANDLED);
504 }
505
506 static int
507 xen_invlrng_invpcid_handler(void *arg)
508 {
509
510 invlrng_invpcid_handler();
511 return (FILTER_HANDLED);
512 }
513
514 static int
515 xen_invlrng_pcid_handler(void *arg)
516 {
517
518 invlrng_pcid_handler();
519 return (FILTER_HANDLED);
520 }
521 #endif
522
523 static int
524 xen_invlpg(void *arg)
525 {
526
527 invlpg_handler();
528 return (FILTER_HANDLED);
529 }
530
531 static int
532 xen_invlrng(void *arg)
533 {
534
535 invlrng_handler();
536 return (FILTER_HANDLED);
537 }
538
539 static int
540 xen_invlcache(void *arg)
541 {
542
543 invlcache_handler();
544 return (FILTER_HANDLED);
545 }
546
547 static int
548 xen_cpustop_handler(void *arg)
549 {
550
551 cpustop_handler();
552 return (FILTER_HANDLED);
553 }
554
555 static int
556 xen_cpususpend_handler(void *arg)
557 {
558
559 cpususpend_handler();
560 return (FILTER_HANDLED);
561 }
562
563 /*----------------------------- XEN PV IPI setup -----------------------------*/
564 /*
565 * Those functions are provided outside of the Xen PV APIC implementation
566 * so PVHVM guests can also use PV IPIs without having an actual Xen PV APIC,
567 * because on PVHVM there's an emulated LAPIC provided by Xen.
568 */
569 static void
570 xen_cpu_ipi_init(int cpu)
571 {
572 xen_intr_handle_t *ipi_handle;
573 const struct xen_ipi_handler *ipi;
574 int idx, rc;
575
576 ipi_handle = DPCPU_ID_GET(cpu, ipi_handle);
577
578 for (ipi = xen_ipis, idx = 0; idx < nitems(xen_ipis); ipi++, idx++) {
579
580 if (ipi->filter == NULL) {
581 ipi_handle[idx] = NULL;
582 continue;
583 }
584
585 rc = xen_intr_alloc_and_bind_ipi(cpu, ipi->filter,
586 INTR_TYPE_TTY, &ipi_handle[idx]);
587 if (rc != 0)
588 panic("Unable to allocate a XEN IPI port");
589 xen_intr_describe(ipi_handle[idx], "%s", ipi->description);
590 }
591 }
592
593 static void
594 xen_setup_cpus(void)
595 {
596 int i;
597
598 if (!xen_vector_callback_enabled)
599 return;
600
601 #ifdef __amd64__
602 if (pmap_pcid_enabled) {
603 if (pti)
604 xen_ipis[IPI_TO_IDX(IPI_INVLTLB)].filter =
605 invpcid_works ? xen_invltlb_invpcid_pti :
606 xen_invltlb_pcid;
607 else
608 xen_ipis[IPI_TO_IDX(IPI_INVLTLB)].filter =
609 invpcid_works ? xen_invltlb_invpcid :
610 xen_invltlb_pcid;
611 xen_ipis[IPI_TO_IDX(IPI_INVLPG)].filter = invpcid_works ?
612 xen_invlpg_invpcid_handler : xen_invlpg_pcid_handler;
613 xen_ipis[IPI_TO_IDX(IPI_INVLRNG)].filter = invpcid_works ?
614 xen_invlrng_invpcid_handler : xen_invlrng_pcid_handler;
615 }
616 #endif
617 CPU_FOREACH(i)
618 xen_cpu_ipi_init(i);
619
620 /* Set the xen pv ipi ops to replace the native ones */
621 if (xen_hvm_domain())
622 apic_ops.ipi_vectored = xen_pv_lapic_ipi_vectored;
623 }
624
625 /* We need to setup IPIs before APs are started */
626 SYSINIT(xen_setup_cpus, SI_SUB_SMP-1, SI_ORDER_FIRST, xen_setup_cpus, NULL);
627 #endif /* SMP */
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