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24#include <linux/linkage.h>
25#include <linux/interrupt.h>
26#include <linux/irq.h>
27#include <linux/module.h>
28#include <linux/string.h>
29#include <linux/bootmem.h>
30#include <linux/slab.h>
31#include <linux/irqnr.h>
32#include <linux/pci.h>
33
34#ifdef CONFIG_X86
35#include <asm/desc.h>
36#include <asm/ptrace.h>
37#include <asm/irq.h>
38#include <asm/idle.h>
39#include <asm/io_apic.h>
40#include <asm/xen/page.h>
41#include <asm/xen/pci.h>
42#endif
43#include <asm/sync_bitops.h>
44#include <asm/xen/hypercall.h>
45#include <asm/xen/hypervisor.h>
46
47#include <xen/xen.h>
48#include <xen/hvm.h>
49#include <xen/xen-ops.h>
50#include <xen/events.h>
51#include <xen/interface/xen.h>
52#include <xen/interface/event_channel.h>
53#include <xen/interface/hvm/hvm_op.h>
54#include <xen/interface/hvm/params.h>
55#include <xen/interface/physdev.h>
56#include <xen/interface/sched.h>
57#include <asm/hw_irq.h>
58
59
60
61
62
63static DEFINE_MUTEX(irq_mapping_update_lock);
64
65static LIST_HEAD(xen_irq_list_head);
66
67
68static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
69
70
71static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
72
73
74enum xen_irq_type {
75 IRQT_UNBOUND = 0,
76 IRQT_PIRQ,
77 IRQT_VIRQ,
78 IRQT_IPI,
79 IRQT_EVTCHN
80};
81
82
83
84
85
86
87
88
89
90
91
92
93struct irq_info {
94 struct list_head list;
95 int refcnt;
96 enum xen_irq_type type;
97 unsigned irq;
98 unsigned short evtchn;
99 unsigned short cpu;
100
101 union {
102 unsigned short virq;
103 enum ipi_vector ipi;
104 struct {
105 unsigned short pirq;
106 unsigned short gsi;
107 unsigned char flags;
108 uint16_t domid;
109 } pirq;
110 } u;
111};
112#define PIRQ_NEEDS_EOI (1 << 0)
113#define PIRQ_SHAREABLE (1 << 1)
114
115static int *evtchn_to_irq;
116#ifdef CONFIG_X86
117static unsigned long *pirq_eoi_map;
118#endif
119static bool (*pirq_needs_eoi)(unsigned irq);
120
121
122
123
124
125
126
127#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
128
129
130
131
132#define BM(x) (unsigned long *)(x)
133
134#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
135
136static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
137 cpu_evtchn_mask);
138
139
140#define VALID_EVTCHN(chn) ((chn) != 0)
141
142static struct irq_chip xen_dynamic_chip;
143static struct irq_chip xen_percpu_chip;
144static struct irq_chip xen_pirq_chip;
145static void enable_dynirq(struct irq_data *data);
146static void disable_dynirq(struct irq_data *data);
147
148
149static struct irq_info *info_for_irq(unsigned irq)
150{
151 return irq_get_handler_data(irq);
152}
153
154
155static void xen_irq_info_common_init(struct irq_info *info,
156 unsigned irq,
157 enum xen_irq_type type,
158 unsigned short evtchn,
159 unsigned short cpu)
160{
161
162 BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
163
164 info->type = type;
165 info->irq = irq;
166 info->evtchn = evtchn;
167 info->cpu = cpu;
168
169 evtchn_to_irq[evtchn] = irq;
170
171 irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
172}
173
174static void xen_irq_info_evtchn_init(unsigned irq,
175 unsigned short evtchn)
176{
177 struct irq_info *info = info_for_irq(irq);
178
179 xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0);
180}
181
182static void xen_irq_info_ipi_init(unsigned cpu,
183 unsigned irq,
184 unsigned short evtchn,
185 enum ipi_vector ipi)
186{
187 struct irq_info *info = info_for_irq(irq);
188
189 xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0);
190
191 info->u.ipi = ipi;
192
193 per_cpu(ipi_to_irq, cpu)[ipi] = irq;
194}
195
196static void xen_irq_info_virq_init(unsigned cpu,
197 unsigned irq,
198 unsigned short evtchn,
199 unsigned short virq)
200{
201 struct irq_info *info = info_for_irq(irq);
202
203 xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0);
204
205 info->u.virq = virq;
206
207 per_cpu(virq_to_irq, cpu)[virq] = irq;
208}
209
210static void xen_irq_info_pirq_init(unsigned irq,
211 unsigned short evtchn,
212 unsigned short pirq,
213 unsigned short gsi,
214 uint16_t domid,
215 unsigned char flags)
216{
217 struct irq_info *info = info_for_irq(irq);
218
219 xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0);
220
221 info->u.pirq.pirq = pirq;
222 info->u.pirq.gsi = gsi;
223 info->u.pirq.domid = domid;
224 info->u.pirq.flags = flags;
225}
226
227
228
229
230static unsigned int evtchn_from_irq(unsigned irq)
231{
232 if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
233 return 0;
234
235 return info_for_irq(irq)->evtchn;
236}
237
238unsigned irq_from_evtchn(unsigned int evtchn)
239{
240 return evtchn_to_irq[evtchn];
241}
242EXPORT_SYMBOL_GPL(irq_from_evtchn);
243
244static enum ipi_vector ipi_from_irq(unsigned irq)
245{
246 struct irq_info *info = info_for_irq(irq);
247
248 BUG_ON(info == NULL);
249 BUG_ON(info->type != IRQT_IPI);
250
251 return info->u.ipi;
252}
253
254static unsigned virq_from_irq(unsigned irq)
255{
256 struct irq_info *info = info_for_irq(irq);
257
258 BUG_ON(info == NULL);
259 BUG_ON(info->type != IRQT_VIRQ);
260
261 return info->u.virq;
262}
263
264static unsigned pirq_from_irq(unsigned irq)
265{
266 struct irq_info *info = info_for_irq(irq);
267
268 BUG_ON(info == NULL);
269 BUG_ON(info->type != IRQT_PIRQ);
270
271 return info->u.pirq.pirq;
272}
273
274static enum xen_irq_type type_from_irq(unsigned irq)
275{
276 return info_for_irq(irq)->type;
277}
278
279static unsigned cpu_from_irq(unsigned irq)
280{
281 return info_for_irq(irq)->cpu;
282}
283
284static unsigned int cpu_from_evtchn(unsigned int evtchn)
285{
286 int irq = evtchn_to_irq[evtchn];
287 unsigned ret = 0;
288
289 if (irq != -1)
290 ret = cpu_from_irq(irq);
291
292 return ret;
293}
294
295#ifdef CONFIG_X86
296static bool pirq_check_eoi_map(unsigned irq)
297{
298 return test_bit(pirq_from_irq(irq), pirq_eoi_map);
299}
300#endif
301
302static bool pirq_needs_eoi_flag(unsigned irq)
303{
304 struct irq_info *info = info_for_irq(irq);
305 BUG_ON(info->type != IRQT_PIRQ);
306
307 return info->u.pirq.flags & PIRQ_NEEDS_EOI;
308}
309
310static inline xen_ulong_t active_evtchns(unsigned int cpu,
311 struct shared_info *sh,
312 unsigned int idx)
313{
314 return sh->evtchn_pending[idx] &
315 per_cpu(cpu_evtchn_mask, cpu)[idx] &
316 ~sh->evtchn_mask[idx];
317}
318
319static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
320{
321 int irq = evtchn_to_irq[chn];
322
323 BUG_ON(irq == -1);
324#ifdef CONFIG_SMP
325 cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
326#endif
327
328 clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
329 set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
330
331 info_for_irq(irq)->cpu = cpu;
332}
333
334static void init_evtchn_cpu_bindings(void)
335{
336 int i;
337#ifdef CONFIG_SMP
338 struct irq_info *info;
339
340
341 list_for_each_entry(info, &xen_irq_list_head, list) {
342 struct irq_desc *desc = irq_to_desc(info->irq);
343 cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
344 }
345#endif
346
347 for_each_possible_cpu(i)
348 memset(per_cpu(cpu_evtchn_mask, i),
349 (i == 0) ? ~0 : 0, sizeof(*per_cpu(cpu_evtchn_mask, i)));
350}
351
352static inline void clear_evtchn(int port)
353{
354 struct shared_info *s = HYPERVISOR_shared_info;
355 sync_clear_bit(port, BM(&s->evtchn_pending[0]));
356}
357
358static inline void set_evtchn(int port)
359{
360 struct shared_info *s = HYPERVISOR_shared_info;
361 sync_set_bit(port, BM(&s->evtchn_pending[0]));
362}
363
364static inline int test_evtchn(int port)
365{
366 struct shared_info *s = HYPERVISOR_shared_info;
367 return sync_test_bit(port, BM(&s->evtchn_pending[0]));
368}
369
370
371
372
373
374
375
376
377
378
379void notify_remote_via_irq(int irq)
380{
381 int evtchn = evtchn_from_irq(irq);
382
383 if (VALID_EVTCHN(evtchn))
384 notify_remote_via_evtchn(evtchn);
385}
386EXPORT_SYMBOL_GPL(notify_remote_via_irq);
387
388static void mask_evtchn(int port)
389{
390 struct shared_info *s = HYPERVISOR_shared_info;
391 sync_set_bit(port, BM(&s->evtchn_mask[0]));
392}
393
394static void unmask_evtchn(int port)
395{
396 struct shared_info *s = HYPERVISOR_shared_info;
397 unsigned int cpu = get_cpu();
398 int do_hypercall = 0, evtchn_pending = 0;
399
400 BUG_ON(!irqs_disabled());
401
402 if (unlikely((cpu != cpu_from_evtchn(port))))
403 do_hypercall = 1;
404 else {
405
406
407
408
409
410
411
412
413 sync_clear_bit(port, BM(&s->evtchn_mask[0]));
414 evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
415
416 if (unlikely(evtchn_pending && xen_hvm_domain())) {
417 sync_set_bit(port, BM(&s->evtchn_mask[0]));
418 do_hypercall = 1;
419 }
420 }
421
422
423
424
425 if (do_hypercall) {
426 struct evtchn_unmask unmask = { .port = port };
427 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
428 } else {
429 struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
430
431
432
433
434
435
436 if (evtchn_pending &&
437 !sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
438 BM(&vcpu_info->evtchn_pending_sel)))
439 vcpu_info->evtchn_upcall_pending = 1;
440 }
441
442 put_cpu();
443}
444
445static void xen_irq_init(unsigned irq)
446{
447 struct irq_info *info;
448#ifdef CONFIG_SMP
449 struct irq_desc *desc = irq_to_desc(irq);
450
451
452 cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
453#endif
454
455 info = kzalloc(sizeof(*info), GFP_KERNEL);
456 if (info == NULL)
457 panic("Unable to allocate metadata for IRQ%d\n", irq);
458
459 info->type = IRQT_UNBOUND;
460 info->refcnt = -1;
461
462 irq_set_handler_data(irq, info);
463
464 list_add_tail(&info->list, &xen_irq_list_head);
465}
466
467static int __must_check xen_allocate_irq_dynamic(void)
468{
469 int first = 0;
470 int irq;
471
472#ifdef CONFIG_X86_IO_APIC
473
474
475
476
477
478
479
480 if (xen_initial_domain() || xen_hvm_domain())
481 first = get_nr_irqs_gsi();
482#endif
483
484 irq = irq_alloc_desc_from(first, -1);
485
486 if (irq >= 0)
487 xen_irq_init(irq);
488
489 return irq;
490}
491
492static int __must_check xen_allocate_irq_gsi(unsigned gsi)
493{
494 int irq;
495
496
497
498
499
500
501
502 if (xen_pv_domain() && !xen_initial_domain())
503 return xen_allocate_irq_dynamic();
504
505
506 if (gsi < NR_IRQS_LEGACY)
507 irq = gsi;
508 else
509 irq = irq_alloc_desc_at(gsi, -1);
510
511 xen_irq_init(irq);
512
513 return irq;
514}
515
516static void xen_free_irq(unsigned irq)
517{
518 struct irq_info *info = irq_get_handler_data(irq);
519
520 if (WARN_ON(!info))
521 return;
522
523 list_del(&info->list);
524
525 irq_set_handler_data(irq, NULL);
526
527 WARN_ON(info->refcnt > 0);
528
529 kfree(info);
530
531
532 if (irq < NR_IRQS_LEGACY)
533 return;
534
535 irq_free_desc(irq);
536}
537
538static void pirq_query_unmask(int irq)
539{
540 struct physdev_irq_status_query irq_status;
541 struct irq_info *info = info_for_irq(irq);
542
543 BUG_ON(info->type != IRQT_PIRQ);
544
545 irq_status.irq = pirq_from_irq(irq);
546 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
547 irq_status.flags = 0;
548
549 info->u.pirq.flags &= ~PIRQ_NEEDS_EOI;
550 if (irq_status.flags & XENIRQSTAT_needs_eoi)
551 info->u.pirq.flags |= PIRQ_NEEDS_EOI;
552}
553
554static bool probing_irq(int irq)
555{
556 struct irq_desc *desc = irq_to_desc(irq);
557
558 return desc && desc->action == NULL;
559}
560
561static void eoi_pirq(struct irq_data *data)
562{
563 int evtchn = evtchn_from_irq(data->irq);
564 struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
565 int rc = 0;
566
567 irq_move_irq(data);
568
569 if (VALID_EVTCHN(evtchn))
570 clear_evtchn(evtchn);
571
572 if (pirq_needs_eoi(data->irq)) {
573 rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
574 WARN_ON(rc);
575 }
576}
577
578static void mask_ack_pirq(struct irq_data *data)
579{
580 disable_dynirq(data);
581 eoi_pirq(data);
582}
583
584static unsigned int __startup_pirq(unsigned int irq)
585{
586 struct evtchn_bind_pirq bind_pirq;
587 struct irq_info *info = info_for_irq(irq);
588 int evtchn = evtchn_from_irq(irq);
589 int rc;
590
591 BUG_ON(info->type != IRQT_PIRQ);
592
593 if (VALID_EVTCHN(evtchn))
594 goto out;
595
596 bind_pirq.pirq = pirq_from_irq(irq);
597
598 bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ?
599 BIND_PIRQ__WILL_SHARE : 0;
600 rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
601 if (rc != 0) {
602 if (!probing_irq(irq))
603 printk(KERN_INFO "Failed to obtain physical IRQ %d\n",
604 irq);
605 return 0;
606 }
607 evtchn = bind_pirq.port;
608
609 pirq_query_unmask(irq);
610
611 evtchn_to_irq[evtchn] = irq;
612 bind_evtchn_to_cpu(evtchn, 0);
613 info->evtchn = evtchn;
614
615out:
616 unmask_evtchn(evtchn);
617 eoi_pirq(irq_get_irq_data(irq));
618
619 return 0;
620}
621
622static unsigned int startup_pirq(struct irq_data *data)
623{
624 return __startup_pirq(data->irq);
625}
626
627static void shutdown_pirq(struct irq_data *data)
628{
629 struct evtchn_close close;
630 unsigned int irq = data->irq;
631 struct irq_info *info = info_for_irq(irq);
632 int evtchn = evtchn_from_irq(irq);
633
634 BUG_ON(info->type != IRQT_PIRQ);
635
636 if (!VALID_EVTCHN(evtchn))
637 return;
638
639 mask_evtchn(evtchn);
640
641 close.port = evtchn;
642 if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
643 BUG();
644
645 bind_evtchn_to_cpu(evtchn, 0);
646 evtchn_to_irq[evtchn] = -1;
647 info->evtchn = 0;
648}
649
650static void enable_pirq(struct irq_data *data)
651{
652 startup_pirq(data);
653}
654
655static void disable_pirq(struct irq_data *data)
656{
657 disable_dynirq(data);
658}
659
660int xen_irq_from_gsi(unsigned gsi)
661{
662 struct irq_info *info;
663
664 list_for_each_entry(info, &xen_irq_list_head, list) {
665 if (info->type != IRQT_PIRQ)
666 continue;
667
668 if (info->u.pirq.gsi == gsi)
669 return info->irq;
670 }
671
672 return -1;
673}
674EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
675
676
677
678
679
680
681
682
683
684
685
686int xen_bind_pirq_gsi_to_irq(unsigned gsi,
687 unsigned pirq, int shareable, char *name)
688{
689 int irq = -1;
690 struct physdev_irq irq_op;
691
692 mutex_lock(&irq_mapping_update_lock);
693
694 irq = xen_irq_from_gsi(gsi);
695 if (irq != -1) {
696 printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n",
697 irq, gsi);
698 goto out;
699 }
700
701 irq = xen_allocate_irq_gsi(gsi);
702 if (irq < 0)
703 goto out;
704
705 irq_op.irq = irq;
706 irq_op.vector = 0;
707
708
709
710
711 if (xen_initial_domain() &&
712 HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {
713 xen_free_irq(irq);
714 irq = -ENOSPC;
715 goto out;
716 }
717
718 xen_irq_info_pirq_init(irq, 0, pirq, gsi, DOMID_SELF,
719 shareable ? PIRQ_SHAREABLE : 0);
720
721 pirq_query_unmask(irq);
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737 if (shareable)
738 irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
739 handle_fasteoi_irq, name);
740 else
741 irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
742 handle_edge_irq, name);
743
744out:
745 mutex_unlock(&irq_mapping_update_lock);
746
747 return irq;
748}
749
750#ifdef CONFIG_PCI_MSI
751int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc)
752{
753 int rc;
754 struct physdev_get_free_pirq op_get_free_pirq;
755
756 op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI;
757 rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
758
759 WARN_ONCE(rc == -ENOSYS,
760 "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
761
762 return rc ? -1 : op_get_free_pirq.pirq;
763}
764
765int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
766 int pirq, const char *name, domid_t domid)
767{
768 int irq, ret;
769
770 mutex_lock(&irq_mapping_update_lock);
771
772 irq = xen_allocate_irq_dynamic();
773 if (irq < 0)
774 goto out;
775
776 irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
777 name);
778
779 xen_irq_info_pirq_init(irq, 0, pirq, 0, domid, 0);
780 ret = irq_set_msi_desc(irq, msidesc);
781 if (ret < 0)
782 goto error_irq;
783out:
784 mutex_unlock(&irq_mapping_update_lock);
785 return irq;
786error_irq:
787 mutex_unlock(&irq_mapping_update_lock);
788 xen_free_irq(irq);
789 return ret;
790}
791#endif
792
793int xen_destroy_irq(int irq)
794{
795 struct irq_desc *desc;
796 struct physdev_unmap_pirq unmap_irq;
797 struct irq_info *info = info_for_irq(irq);
798 int rc = -ENOENT;
799
800 mutex_lock(&irq_mapping_update_lock);
801
802 desc = irq_to_desc(irq);
803 if (!desc)
804 goto out;
805
806 if (xen_initial_domain()) {
807 unmap_irq.pirq = info->u.pirq.pirq;
808 unmap_irq.domid = info->u.pirq.domid;
809 rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
810
811
812
813
814 if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF))
815 printk(KERN_INFO "domain %d does not have %d anymore\n",
816 info->u.pirq.domid, info->u.pirq.pirq);
817 else if (rc) {
818 printk(KERN_WARNING "unmap irq failed %d\n", rc);
819 goto out;
820 }
821 }
822
823 xen_free_irq(irq);
824
825out:
826 mutex_unlock(&irq_mapping_update_lock);
827 return rc;
828}
829
830int xen_irq_from_pirq(unsigned pirq)
831{
832 int irq;
833
834 struct irq_info *info;
835
836 mutex_lock(&irq_mapping_update_lock);
837
838 list_for_each_entry(info, &xen_irq_list_head, list) {
839 if (info->type != IRQT_PIRQ)
840 continue;
841 irq = info->irq;
842 if (info->u.pirq.pirq == pirq)
843 goto out;
844 }
845 irq = -1;
846out:
847 mutex_unlock(&irq_mapping_update_lock);
848
849 return irq;
850}
851
852
853int xen_pirq_from_irq(unsigned irq)
854{
855 return pirq_from_irq(irq);
856}
857EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
858int bind_evtchn_to_irq(unsigned int evtchn)
859{
860 int irq;
861
862 mutex_lock(&irq_mapping_update_lock);
863
864 irq = evtchn_to_irq[evtchn];
865
866 if (irq == -1) {
867 irq = xen_allocate_irq_dynamic();
868 if (irq < 0)
869 goto out;
870
871 irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
872 handle_edge_irq, "event");
873
874 xen_irq_info_evtchn_init(irq, evtchn);
875 } else {
876 struct irq_info *info = info_for_irq(irq);
877 WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
878 }
879
880out:
881 mutex_unlock(&irq_mapping_update_lock);
882
883 return irq;
884}
885EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
886
887static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
888{
889 struct evtchn_bind_ipi bind_ipi;
890 int evtchn, irq;
891
892 mutex_lock(&irq_mapping_update_lock);
893
894 irq = per_cpu(ipi_to_irq, cpu)[ipi];
895
896 if (irq == -1) {
897 irq = xen_allocate_irq_dynamic();
898 if (irq < 0)
899 goto out;
900
901 irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
902 handle_percpu_irq, "ipi");
903
904 bind_ipi.vcpu = cpu;
905 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
906 &bind_ipi) != 0)
907 BUG();
908 evtchn = bind_ipi.port;
909
910 xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
911
912 bind_evtchn_to_cpu(evtchn, cpu);
913 } else {
914 struct irq_info *info = info_for_irq(irq);
915 WARN_ON(info == NULL || info->type != IRQT_IPI);
916 }
917
918 out:
919 mutex_unlock(&irq_mapping_update_lock);
920 return irq;
921}
922
923static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
924 unsigned int remote_port)
925{
926 struct evtchn_bind_interdomain bind_interdomain;
927 int err;
928
929 bind_interdomain.remote_dom = remote_domain;
930 bind_interdomain.remote_port = remote_port;
931
932 err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
933 &bind_interdomain);
934
935 return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
936}
937
938static int find_virq(unsigned int virq, unsigned int cpu)
939{
940 struct evtchn_status status;
941 int port, rc = -ENOENT;
942
943 memset(&status, 0, sizeof(status));
944 for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
945 status.dom = DOMID_SELF;
946 status.port = port;
947 rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
948 if (rc < 0)
949 continue;
950 if (status.status != EVTCHNSTAT_virq)
951 continue;
952 if (status.u.virq == virq && status.vcpu == cpu) {
953 rc = port;
954 break;
955 }
956 }
957 return rc;
958}
959
960int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
961{
962 struct evtchn_bind_virq bind_virq;
963 int evtchn, irq, ret;
964
965 mutex_lock(&irq_mapping_update_lock);
966
967 irq = per_cpu(virq_to_irq, cpu)[virq];
968
969 if (irq == -1) {
970 irq = xen_allocate_irq_dynamic();
971 if (irq < 0)
972 goto out;
973
974 irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
975 handle_percpu_irq, "virq");
976
977 bind_virq.virq = virq;
978 bind_virq.vcpu = cpu;
979 ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
980 &bind_virq);
981 if (ret == 0)
982 evtchn = bind_virq.port;
983 else {
984 if (ret == -EEXIST)
985 ret = find_virq(virq, cpu);
986 BUG_ON(ret < 0);
987 evtchn = ret;
988 }
989
990 xen_irq_info_virq_init(cpu, irq, evtchn, virq);
991
992 bind_evtchn_to_cpu(evtchn, cpu);
993 } else {
994 struct irq_info *info = info_for_irq(irq);
995 WARN_ON(info == NULL || info->type != IRQT_VIRQ);
996 }
997
998out:
999 mutex_unlock(&irq_mapping_update_lock);
1000
1001 return irq;
1002}
1003
1004static void unbind_from_irq(unsigned int irq)
1005{
1006 struct evtchn_close close;
1007 int evtchn = evtchn_from_irq(irq);
1008 struct irq_info *info = irq_get_handler_data(irq);
1009
1010 if (WARN_ON(!info))
1011 return;
1012
1013 mutex_lock(&irq_mapping_update_lock);
1014
1015 if (info->refcnt > 0) {
1016 info->refcnt--;
1017 if (info->refcnt != 0)
1018 goto done;
1019 }
1020
1021 if (VALID_EVTCHN(evtchn)) {
1022 close.port = evtchn;
1023 if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
1024 BUG();
1025
1026 switch (type_from_irq(irq)) {
1027 case IRQT_VIRQ:
1028 per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
1029 [virq_from_irq(irq)] = -1;
1030 break;
1031 case IRQT_IPI:
1032 per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
1033 [ipi_from_irq(irq)] = -1;
1034 break;
1035 default:
1036 break;
1037 }
1038
1039
1040 bind_evtchn_to_cpu(evtchn, 0);
1041
1042 evtchn_to_irq[evtchn] = -1;
1043 }
1044
1045 BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
1046
1047 xen_free_irq(irq);
1048
1049 done:
1050 mutex_unlock(&irq_mapping_update_lock);
1051}
1052
1053int bind_evtchn_to_irqhandler(unsigned int evtchn,
1054 irq_handler_t handler,
1055 unsigned long irqflags,
1056 const char *devname, void *dev_id)
1057{
1058 int irq, retval;
1059
1060 irq = bind_evtchn_to_irq(evtchn);
1061 if (irq < 0)
1062 return irq;
1063 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1064 if (retval != 0) {
1065 unbind_from_irq(irq);
1066 return retval;
1067 }
1068
1069 return irq;
1070}
1071EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
1072
1073int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
1074 unsigned int remote_port,
1075 irq_handler_t handler,
1076 unsigned long irqflags,
1077 const char *devname,
1078 void *dev_id)
1079{
1080 int irq, retval;
1081
1082 irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
1083 if (irq < 0)
1084 return irq;
1085
1086 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1087 if (retval != 0) {
1088 unbind_from_irq(irq);
1089 return retval;
1090 }
1091
1092 return irq;
1093}
1094EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler);
1095
1096int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
1097 irq_handler_t handler,
1098 unsigned long irqflags, const char *devname, void *dev_id)
1099{
1100 int irq, retval;
1101
1102 irq = bind_virq_to_irq(virq, cpu);
1103 if (irq < 0)
1104 return irq;
1105 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1106 if (retval != 0) {
1107 unbind_from_irq(irq);
1108 return retval;
1109 }
1110
1111 return irq;
1112}
1113EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler);
1114
1115int bind_ipi_to_irqhandler(enum ipi_vector ipi,
1116 unsigned int cpu,
1117 irq_handler_t handler,
1118 unsigned long irqflags,
1119 const char *devname,
1120 void *dev_id)
1121{
1122 int irq, retval;
1123
1124 irq = bind_ipi_to_irq(ipi, cpu);
1125 if (irq < 0)
1126 return irq;
1127
1128 irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME;
1129 retval = request_irq(irq, handler, irqflags, devname, dev_id);
1130 if (retval != 0) {
1131 unbind_from_irq(irq);
1132 return retval;
1133 }
1134
1135 return irq;
1136}
1137
1138void unbind_from_irqhandler(unsigned int irq, void *dev_id)
1139{
1140 struct irq_info *info = irq_get_handler_data(irq);
1141
1142 if (WARN_ON(!info))
1143 return;
1144 free_irq(irq, dev_id);
1145 unbind_from_irq(irq);
1146}
1147EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
1148
1149int evtchn_make_refcounted(unsigned int evtchn)
1150{
1151 int irq = evtchn_to_irq[evtchn];
1152 struct irq_info *info;
1153
1154 if (irq == -1)
1155 return -ENOENT;
1156
1157 info = irq_get_handler_data(irq);
1158
1159 if (!info)
1160 return -ENOENT;
1161
1162 WARN_ON(info->refcnt != -1);
1163
1164 info->refcnt = 1;
1165
1166 return 0;
1167}
1168EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
1169
1170int evtchn_get(unsigned int evtchn)
1171{
1172 int irq;
1173 struct irq_info *info;
1174 int err = -ENOENT;
1175
1176 if (evtchn >= NR_EVENT_CHANNELS)
1177 return -EINVAL;
1178
1179 mutex_lock(&irq_mapping_update_lock);
1180
1181 irq = evtchn_to_irq[evtchn];
1182 if (irq == -1)
1183 goto done;
1184
1185 info = irq_get_handler_data(irq);
1186
1187 if (!info)
1188 goto done;
1189
1190 err = -EINVAL;
1191 if (info->refcnt <= 0)
1192 goto done;
1193
1194 info->refcnt++;
1195 err = 0;
1196 done:
1197 mutex_unlock(&irq_mapping_update_lock);
1198
1199 return err;
1200}
1201EXPORT_SYMBOL_GPL(evtchn_get);
1202
1203void evtchn_put(unsigned int evtchn)
1204{
1205 int irq = evtchn_to_irq[evtchn];
1206 if (WARN_ON(irq == -1))
1207 return;
1208 unbind_from_irq(irq);
1209}
1210EXPORT_SYMBOL_GPL(evtchn_put);
1211
1212void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
1213{
1214 int irq = per_cpu(ipi_to_irq, cpu)[vector];
1215 BUG_ON(irq < 0);
1216 notify_remote_via_irq(irq);
1217}
1218
1219irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
1220{
1221 struct shared_info *sh = HYPERVISOR_shared_info;
1222 int cpu = smp_processor_id();
1223 xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
1224 int i;
1225 unsigned long flags;
1226 static DEFINE_SPINLOCK(debug_lock);
1227 struct vcpu_info *v;
1228
1229 spin_lock_irqsave(&debug_lock, flags);
1230
1231 printk("\nvcpu %d\n ", cpu);
1232
1233 for_each_online_cpu(i) {
1234 int pending;
1235 v = per_cpu(xen_vcpu, i);
1236 pending = (get_irq_regs() && i == cpu)
1237 ? xen_irqs_disabled(get_irq_regs())
1238 : v->evtchn_upcall_mask;
1239 printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i,
1240 pending, v->evtchn_upcall_pending,
1241 (int)(sizeof(v->evtchn_pending_sel)*2),
1242 v->evtchn_pending_sel);
1243 }
1244 v = per_cpu(xen_vcpu, cpu);
1245
1246 printk("\npending:\n ");
1247 for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
1248 printk("%0*"PRI_xen_ulong"%s",
1249 (int)sizeof(sh->evtchn_pending[0])*2,
1250 sh->evtchn_pending[i],
1251 i % 8 == 0 ? "\n " : " ");
1252 printk("\nglobal mask:\n ");
1253 for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
1254 printk("%0*"PRI_xen_ulong"%s",
1255 (int)(sizeof(sh->evtchn_mask[0])*2),
1256 sh->evtchn_mask[i],
1257 i % 8 == 0 ? "\n " : " ");
1258
1259 printk("\nglobally unmasked:\n ");
1260 for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
1261 printk("%0*"PRI_xen_ulong"%s",
1262 (int)(sizeof(sh->evtchn_mask[0])*2),
1263 sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
1264 i % 8 == 0 ? "\n " : " ");
1265
1266 printk("\nlocal cpu%d mask:\n ", cpu);
1267 for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
1268 printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
1269 cpu_evtchn[i],
1270 i % 8 == 0 ? "\n " : " ");
1271
1272 printk("\nlocally unmasked:\n ");
1273 for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
1274 xen_ulong_t pending = sh->evtchn_pending[i]
1275 & ~sh->evtchn_mask[i]
1276 & cpu_evtchn[i];
1277 printk("%0*"PRI_xen_ulong"%s",
1278 (int)(sizeof(sh->evtchn_mask[0])*2),
1279 pending, i % 8 == 0 ? "\n " : " ");
1280 }
1281
1282 printk("\npending list:\n");
1283 for (i = 0; i < NR_EVENT_CHANNELS; i++) {
1284 if (sync_test_bit(i, BM(sh->evtchn_pending))) {
1285 int word_idx = i / BITS_PER_EVTCHN_WORD;
1286 printk(" %d: event %d -> irq %d%s%s%s\n",
1287 cpu_from_evtchn(i), i,
1288 evtchn_to_irq[i],
1289 sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
1290 ? "" : " l2-clear",
1291 !sync_test_bit(i, BM(sh->evtchn_mask))
1292 ? "" : " globally-masked",
1293 sync_test_bit(i, BM(cpu_evtchn))
1294 ? "" : " locally-masked");
1295 }
1296 }
1297
1298 spin_unlock_irqrestore(&debug_lock, flags);
1299
1300 return IRQ_HANDLED;
1301}
1302
1303static DEFINE_PER_CPU(unsigned, xed_nesting_count);
1304static DEFINE_PER_CPU(unsigned int, current_word_idx);
1305static DEFINE_PER_CPU(unsigned int, current_bit_idx);
1306
1307
1308
1309
1310#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321static void __xen_evtchn_do_upcall(void)
1322{
1323 int start_word_idx, start_bit_idx;
1324 int word_idx, bit_idx;
1325 int i, irq;
1326 int cpu = get_cpu();
1327 struct shared_info *s = HYPERVISOR_shared_info;
1328 struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
1329 unsigned count;
1330
1331 do {
1332 xen_ulong_t pending_words;
1333 xen_ulong_t pending_bits;
1334 struct irq_desc *desc;
1335
1336 vcpu_info->evtchn_upcall_pending = 0;
1337
1338 if (__this_cpu_inc_return(xed_nesting_count) - 1)
1339 goto out;
1340
1341
1342
1343
1344
1345
1346 if ((irq = per_cpu(virq_to_irq, cpu)[VIRQ_TIMER]) != -1) {
1347 int evtchn = evtchn_from_irq(irq);
1348 word_idx = evtchn / BITS_PER_LONG;
1349 pending_bits = evtchn % BITS_PER_LONG;
1350 if (active_evtchns(cpu, s, word_idx) & (1ULL << pending_bits)) {
1351 desc = irq_to_desc(irq);
1352 if (desc)
1353 generic_handle_irq_desc(irq, desc);
1354 }
1355 }
1356
1357 pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
1358
1359 start_word_idx = __this_cpu_read(current_word_idx);
1360 start_bit_idx = __this_cpu_read(current_bit_idx);
1361
1362 word_idx = start_word_idx;
1363
1364 for (i = 0; pending_words != 0; i++) {
1365 xen_ulong_t words;
1366
1367 words = MASK_LSBS(pending_words, word_idx);
1368
1369
1370
1371
1372 if (words == 0) {
1373 word_idx = 0;
1374 bit_idx = 0;
1375 continue;
1376 }
1377 word_idx = EVTCHN_FIRST_BIT(words);
1378
1379 pending_bits = active_evtchns(cpu, s, word_idx);
1380 bit_idx = 0;
1381 if (word_idx == start_word_idx) {
1382
1383 if (i == 0)
1384
1385 bit_idx = start_bit_idx;
1386 else
1387
1388 bit_idx &= (1UL << start_bit_idx) - 1;
1389 }
1390
1391 do {
1392 xen_ulong_t bits;
1393 int port;
1394
1395 bits = MASK_LSBS(pending_bits, bit_idx);
1396
1397
1398 if (bits == 0)
1399 break;
1400
1401 bit_idx = EVTCHN_FIRST_BIT(bits);
1402
1403
1404 port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
1405 irq = evtchn_to_irq[port];
1406
1407 if (irq != -1) {
1408 desc = irq_to_desc(irq);
1409 if (desc)
1410 generic_handle_irq_desc(irq, desc);
1411 }
1412
1413 bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
1414
1415
1416 __this_cpu_write(current_word_idx,
1417 bit_idx ? word_idx :
1418 (word_idx+1) % BITS_PER_EVTCHN_WORD);
1419 __this_cpu_write(current_bit_idx, bit_idx);
1420 } while (bit_idx != 0);
1421
1422
1423 if ((word_idx != start_word_idx) || (i != 0))
1424 pending_words &= ~(1UL << word_idx);
1425
1426 word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD;
1427 }
1428
1429 BUG_ON(!irqs_disabled());
1430
1431 count = __this_cpu_read(xed_nesting_count);
1432 __this_cpu_write(xed_nesting_count, 0);
1433 } while (count != 1 || vcpu_info->evtchn_upcall_pending);
1434
1435out:
1436
1437 put_cpu();
1438}
1439
1440void xen_evtchn_do_upcall(struct pt_regs *regs)
1441{
1442 struct pt_regs *old_regs = set_irq_regs(regs);
1443
1444 irq_enter();
1445#ifdef CONFIG_X86
1446 exit_idle();
1447#endif
1448
1449 __xen_evtchn_do_upcall();
1450
1451 irq_exit();
1452 set_irq_regs(old_regs);
1453}
1454
1455void xen_hvm_evtchn_do_upcall(void)
1456{
1457 __xen_evtchn_do_upcall();
1458}
1459EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
1460
1461
1462void rebind_evtchn_irq(int evtchn, int irq)
1463{
1464 struct irq_info *info = info_for_irq(irq);
1465
1466 if (WARN_ON(!info))
1467 return;
1468
1469
1470
1471 disable_irq(irq);
1472
1473 mutex_lock(&irq_mapping_update_lock);
1474
1475
1476 BUG_ON(evtchn_to_irq[evtchn] != -1);
1477
1478
1479 BUG_ON(info->type == IRQT_UNBOUND);
1480
1481 xen_irq_info_evtchn_init(irq, evtchn);
1482
1483 mutex_unlock(&irq_mapping_update_lock);
1484
1485
1486 irq_set_affinity(irq, cpumask_of(0));
1487
1488
1489 enable_irq(irq);
1490}
1491
1492
1493static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
1494{
1495 struct evtchn_bind_vcpu bind_vcpu;
1496 int evtchn = evtchn_from_irq(irq);
1497
1498 if (!VALID_EVTCHN(evtchn))
1499 return -1;
1500
1501
1502
1503
1504
1505 if (xen_hvm_domain() && !xen_have_vector_callback)
1506 return -1;
1507
1508
1509 bind_vcpu.port = evtchn;
1510 bind_vcpu.vcpu = tcpu;
1511
1512
1513
1514
1515
1516
1517 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0)
1518 bind_evtchn_to_cpu(evtchn, tcpu);
1519
1520 return 0;
1521}
1522
1523static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
1524 bool force)
1525{
1526 unsigned tcpu = cpumask_first(dest);
1527
1528 return rebind_irq_to_cpu(data->irq, tcpu);
1529}
1530
1531int resend_irq_on_evtchn(unsigned int irq)
1532{
1533 int masked, evtchn = evtchn_from_irq(irq);
1534 struct shared_info *s = HYPERVISOR_shared_info;
1535
1536 if (!VALID_EVTCHN(evtchn))
1537 return 1;
1538
1539 masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
1540 sync_set_bit(evtchn, BM(s->evtchn_pending));
1541 if (!masked)
1542 unmask_evtchn(evtchn);
1543
1544 return 1;
1545}
1546
1547static void enable_dynirq(struct irq_data *data)
1548{
1549 int evtchn = evtchn_from_irq(data->irq);
1550
1551 if (VALID_EVTCHN(evtchn))
1552 unmask_evtchn(evtchn);
1553}
1554
1555static void disable_dynirq(struct irq_data *data)
1556{
1557 int evtchn = evtchn_from_irq(data->irq);
1558
1559 if (VALID_EVTCHN(evtchn))
1560 mask_evtchn(evtchn);
1561}
1562
1563static void ack_dynirq(struct irq_data *data)
1564{
1565 int evtchn = evtchn_from_irq(data->irq);
1566
1567 irq_move_irq(data);
1568
1569 if (VALID_EVTCHN(evtchn))
1570 clear_evtchn(evtchn);
1571}
1572
1573static void mask_ack_dynirq(struct irq_data *data)
1574{
1575 disable_dynirq(data);
1576 ack_dynirq(data);
1577}
1578
1579static int retrigger_dynirq(struct irq_data *data)
1580{
1581 int evtchn = evtchn_from_irq(data->irq);
1582 struct shared_info *sh = HYPERVISOR_shared_info;
1583 int ret = 0;
1584
1585 if (VALID_EVTCHN(evtchn)) {
1586 int masked;
1587
1588 masked = sync_test_and_set_bit(evtchn, BM(sh->evtchn_mask));
1589 sync_set_bit(evtchn, BM(sh->evtchn_pending));
1590 if (!masked)
1591 unmask_evtchn(evtchn);
1592 ret = 1;
1593 }
1594
1595 return ret;
1596}
1597
1598static void restore_pirqs(void)
1599{
1600 int pirq, rc, irq, gsi;
1601 struct physdev_map_pirq map_irq;
1602 struct irq_info *info;
1603
1604 list_for_each_entry(info, &xen_irq_list_head, list) {
1605 if (info->type != IRQT_PIRQ)
1606 continue;
1607
1608 pirq = info->u.pirq.pirq;
1609 gsi = info->u.pirq.gsi;
1610 irq = info->irq;
1611
1612
1613
1614 if (!gsi)
1615 continue;
1616
1617 map_irq.domid = DOMID_SELF;
1618 map_irq.type = MAP_PIRQ_TYPE_GSI;
1619 map_irq.index = gsi;
1620 map_irq.pirq = pirq;
1621
1622 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
1623 if (rc) {
1624 printk(KERN_WARNING "xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
1625 gsi, irq, pirq, rc);
1626 xen_free_irq(irq);
1627 continue;
1628 }
1629
1630 printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
1631
1632 __startup_pirq(irq);
1633 }
1634}
1635
1636static void restore_cpu_virqs(unsigned int cpu)
1637{
1638 struct evtchn_bind_virq bind_virq;
1639 int virq, irq, evtchn;
1640
1641 for (virq = 0; virq < NR_VIRQS; virq++) {
1642 if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
1643 continue;
1644
1645 BUG_ON(virq_from_irq(irq) != virq);
1646
1647
1648 bind_virq.virq = virq;
1649 bind_virq.vcpu = cpu;
1650 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
1651 &bind_virq) != 0)
1652 BUG();
1653 evtchn = bind_virq.port;
1654
1655
1656 xen_irq_info_virq_init(cpu, irq, evtchn, virq);
1657 bind_evtchn_to_cpu(evtchn, cpu);
1658 }
1659}
1660
1661static void restore_cpu_ipis(unsigned int cpu)
1662{
1663 struct evtchn_bind_ipi bind_ipi;
1664 int ipi, irq, evtchn;
1665
1666 for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) {
1667 if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
1668 continue;
1669
1670 BUG_ON(ipi_from_irq(irq) != ipi);
1671
1672
1673 bind_ipi.vcpu = cpu;
1674 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
1675 &bind_ipi) != 0)
1676 BUG();
1677 evtchn = bind_ipi.port;
1678
1679
1680 xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
1681 bind_evtchn_to_cpu(evtchn, cpu);
1682 }
1683}
1684
1685
1686void xen_clear_irq_pending(int irq)
1687{
1688 int evtchn = evtchn_from_irq(irq);
1689
1690 if (VALID_EVTCHN(evtchn))
1691 clear_evtchn(evtchn);
1692}
1693EXPORT_SYMBOL(xen_clear_irq_pending);
1694void xen_set_irq_pending(int irq)
1695{
1696 int evtchn = evtchn_from_irq(irq);
1697
1698 if (VALID_EVTCHN(evtchn))
1699 set_evtchn(evtchn);
1700}
1701
1702bool xen_test_irq_pending(int irq)
1703{
1704 int evtchn = evtchn_from_irq(irq);
1705 bool ret = false;
1706
1707 if (VALID_EVTCHN(evtchn))
1708 ret = test_evtchn(evtchn);
1709
1710 return ret;
1711}
1712
1713
1714
1715void xen_poll_irq_timeout(int irq, u64 timeout)
1716{
1717 evtchn_port_t evtchn = evtchn_from_irq(irq);
1718
1719 if (VALID_EVTCHN(evtchn)) {
1720 struct sched_poll poll;
1721
1722 poll.nr_ports = 1;
1723 poll.timeout = timeout;
1724 set_xen_guest_handle(poll.ports, &evtchn);
1725
1726 if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
1727 BUG();
1728 }
1729}
1730EXPORT_SYMBOL(xen_poll_irq_timeout);
1731
1732
1733void xen_poll_irq(int irq)
1734{
1735 xen_poll_irq_timeout(irq, 0 );
1736}
1737
1738
1739int xen_test_irq_shared(int irq)
1740{
1741 struct irq_info *info = info_for_irq(irq);
1742 struct physdev_irq_status_query irq_status;
1743
1744 if (WARN_ON(!info))
1745 return -ENOENT;
1746
1747 irq_status.irq = info->u.pirq.pirq;
1748
1749 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
1750 return 0;
1751 return !(irq_status.flags & XENIRQSTAT_shared);
1752}
1753EXPORT_SYMBOL_GPL(xen_test_irq_shared);
1754
1755void xen_irq_resume(void)
1756{
1757 unsigned int cpu, evtchn;
1758 struct irq_info *info;
1759
1760 init_evtchn_cpu_bindings();
1761
1762
1763 for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
1764 mask_evtchn(evtchn);
1765
1766
1767 list_for_each_entry(info, &xen_irq_list_head, list)
1768 info->evtchn = 0;
1769
1770 for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
1771 evtchn_to_irq[evtchn] = -1;
1772
1773 for_each_possible_cpu(cpu) {
1774 restore_cpu_virqs(cpu);
1775 restore_cpu_ipis(cpu);
1776 }
1777
1778 restore_pirqs();
1779}
1780
1781static struct irq_chip xen_dynamic_chip __read_mostly = {
1782 .name = "xen-dyn",
1783
1784 .irq_disable = disable_dynirq,
1785 .irq_mask = disable_dynirq,
1786 .irq_unmask = enable_dynirq,
1787
1788 .irq_ack = ack_dynirq,
1789 .irq_mask_ack = mask_ack_dynirq,
1790
1791 .irq_set_affinity = set_affinity_irq,
1792 .irq_retrigger = retrigger_dynirq,
1793};
1794
1795static struct irq_chip xen_pirq_chip __read_mostly = {
1796 .name = "xen-pirq",
1797
1798 .irq_startup = startup_pirq,
1799 .irq_shutdown = shutdown_pirq,
1800 .irq_enable = enable_pirq,
1801 .irq_disable = disable_pirq,
1802
1803 .irq_mask = disable_dynirq,
1804 .irq_unmask = enable_dynirq,
1805
1806 .irq_ack = eoi_pirq,
1807 .irq_eoi = eoi_pirq,
1808 .irq_mask_ack = mask_ack_pirq,
1809
1810 .irq_set_affinity = set_affinity_irq,
1811
1812 .irq_retrigger = retrigger_dynirq,
1813};
1814
1815static struct irq_chip xen_percpu_chip __read_mostly = {
1816 .name = "xen-percpu",
1817
1818 .irq_disable = disable_dynirq,
1819 .irq_mask = disable_dynirq,
1820 .irq_unmask = enable_dynirq,
1821
1822 .irq_ack = ack_dynirq,
1823};
1824
1825int xen_set_callback_via(uint64_t via)
1826{
1827 struct xen_hvm_param a;
1828 a.domid = DOMID_SELF;
1829 a.index = HVM_PARAM_CALLBACK_IRQ;
1830 a.value = via;
1831 return HYPERVISOR_hvm_op(HVMOP_set_param, &a);
1832}
1833EXPORT_SYMBOL_GPL(xen_set_callback_via);
1834
1835#ifdef CONFIG_XEN_PVHVM
1836
1837
1838
1839void xen_callback_vector(void)
1840{
1841 int rc;
1842 uint64_t callback_via;
1843 if (xen_have_vector_callback) {
1844 callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
1845 rc = xen_set_callback_via(callback_via);
1846 if (rc) {
1847 printk(KERN_ERR "Request for Xen HVM callback vector"
1848 " failed.\n");
1849 xen_have_vector_callback = 0;
1850 return;
1851 }
1852 printk(KERN_INFO "Xen HVM callback vector for event delivery is "
1853 "enabled\n");
1854
1855 if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
1856 alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
1857 xen_hvm_callback_vector);
1858 }
1859}
1860#else
1861void xen_callback_vector(void) {}
1862#endif
1863
1864void __init xen_init_IRQ(void)
1865{
1866 int i;
1867
1868 evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
1869 GFP_KERNEL);
1870 BUG_ON(!evtchn_to_irq);
1871 for (i = 0; i < NR_EVENT_CHANNELS; i++)
1872 evtchn_to_irq[i] = -1;
1873
1874 init_evtchn_cpu_bindings();
1875
1876
1877 for (i = 0; i < NR_EVENT_CHANNELS; i++)
1878 mask_evtchn(i);
1879
1880 pirq_needs_eoi = pirq_needs_eoi_flag;
1881
1882#ifdef CONFIG_X86
1883 if (xen_hvm_domain()) {
1884 xen_callback_vector();
1885 native_init_IRQ();
1886
1887
1888 pci_xen_hvm_init();
1889 } else {
1890 int rc;
1891 struct physdev_pirq_eoi_gmfn eoi_gmfn;
1892
1893 irq_ctx_init(smp_processor_id());
1894 if (xen_initial_domain())
1895 pci_xen_initial_domain();
1896
1897 pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
1898 eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
1899 rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
1900 if (rc != 0) {
1901 free_page((unsigned long) pirq_eoi_map);
1902 pirq_eoi_map = NULL;
1903 } else
1904 pirq_needs_eoi = pirq_check_eoi_map;
1905 }
1906#endif
1907}
1908