4 * Xen models interrupts with abstract event channels. Because each
5 * domain gets 1024 event channels, but NR_IRQ is not that large, we
6 * must dynamically map irqs<->event channels. The event channels
7 * interface with the rest of the kernel by defining a xen interrupt
8 * chip. When an event is received, it is mapped to an irq and sent
9 * through the normal interrupt processing path.
11 * There are four kinds of events which can be mapped to an event
14 * 1. Inter-domain notifications. This includes all the virtual
15 * device events, since they're driven by front-ends in another domain
17 * 2. VIRQs, typically used for timers. These are per-cpu events.
19 * 4. PIRQs - Hardware interrupts.
21 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
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>
36 #include <asm/ptrace.h>
39 #include <asm/io_apic.h>
40 #include <asm/xen/page.h>
41 #include <asm/xen/pci.h>
43 #include <asm/sync_bitops.h>
44 #include <asm/xen/hypercall.h>
45 #include <asm/xen/hypervisor.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>
60 * This lock protects updates to the following mapping and reference-count
61 * arrays. The lock does not need to be acquired to read the mapping tables.
63 static DEFINE_MUTEX(irq_mapping_update_lock
);
65 static LIST_HEAD(xen_irq_list_head
);
67 /* IRQ <-> VIRQ mapping. */
68 static DEFINE_PER_CPU(int [NR_VIRQS
], virq_to_irq
) = {[0 ... NR_VIRQS
-1] = -1};
70 /* IRQ <-> IPI mapping */
71 static DEFINE_PER_CPU(int [XEN_NR_IPIS
], ipi_to_irq
) = {[0 ... XEN_NR_IPIS
-1] = -1};
73 /* Interrupt types. */
83 * Packed IRQ information:
84 * type - enum xen_irq_type
85 * event channel - irq->event channel mapping
86 * cpu - cpu this event channel is bound to
87 * index - type-specific information:
88 * PIRQ - physical IRQ, GSI, flags, and owner domain
94 struct list_head list
;
96 enum xen_irq_type type
; /* type */
98 unsigned short evtchn
; /* event channel */
99 unsigned short cpu
; /* cpu bound */
112 #define PIRQ_NEEDS_EOI (1 << 0)
113 #define PIRQ_SHAREABLE (1 << 1)
115 static int *evtchn_to_irq
;
117 static unsigned long *pirq_eoi_map
;
119 static bool (*pirq_needs_eoi
)(unsigned irq
);
122 * Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
123 * careful to only use bitops which allow for this (e.g
124 * test_bit/find_first_bit and friends but not __ffs) and to pass
125 * BITS_PER_EVTCHN_WORD as the bitmask length.
127 #define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
129 * Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
130 * array. Primarily to avoid long lines (hence the terse name).
132 #define BM(x) (unsigned long *)(x)
133 /* Find the first set bit in a evtchn mask */
134 #define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
136 static DEFINE_PER_CPU(xen_ulong_t
[NR_EVENT_CHANNELS
/BITS_PER_EVTCHN_WORD
],
139 /* Xen will never allocate port zero for any purpose. */
140 #define VALID_EVTCHN(chn) ((chn) != 0)
142 static struct irq_chip xen_dynamic_chip
;
143 static struct irq_chip xen_percpu_chip
;
144 static struct irq_chip xen_pirq_chip
;
145 static void enable_dynirq(struct irq_data
*data
);
146 static void disable_dynirq(struct irq_data
*data
);
148 /* Get info for IRQ */
149 static struct irq_info
*info_for_irq(unsigned irq
)
151 return irq_get_handler_data(irq
);
154 /* Constructors for packed IRQ information. */
155 static void xen_irq_info_common_init(struct irq_info
*info
,
157 enum xen_irq_type type
,
158 unsigned short evtchn
,
162 BUG_ON(info
->type
!= IRQT_UNBOUND
&& info
->type
!= type
);
166 info
->evtchn
= evtchn
;
169 evtchn_to_irq
[evtchn
] = irq
;
171 irq_clear_status_flags(irq
, IRQ_NOREQUEST
|IRQ_NOAUTOEN
);
174 static void xen_irq_info_evtchn_init(unsigned irq
,
175 unsigned short evtchn
)
177 struct irq_info
*info
= info_for_irq(irq
);
179 xen_irq_info_common_init(info
, irq
, IRQT_EVTCHN
, evtchn
, 0);
182 static void xen_irq_info_ipi_init(unsigned cpu
,
184 unsigned short evtchn
,
187 struct irq_info
*info
= info_for_irq(irq
);
189 xen_irq_info_common_init(info
, irq
, IRQT_IPI
, evtchn
, 0);
193 per_cpu(ipi_to_irq
, cpu
)[ipi
] = irq
;
196 static void xen_irq_info_virq_init(unsigned cpu
,
198 unsigned short evtchn
,
201 struct irq_info
*info
= info_for_irq(irq
);
203 xen_irq_info_common_init(info
, irq
, IRQT_VIRQ
, evtchn
, 0);
207 per_cpu(virq_to_irq
, cpu
)[virq
] = irq
;
210 static void xen_irq_info_pirq_init(unsigned irq
,
211 unsigned short evtchn
,
217 struct irq_info
*info
= info_for_irq(irq
);
219 xen_irq_info_common_init(info
, irq
, IRQT_PIRQ
, evtchn
, 0);
221 info
->u
.pirq
.pirq
= pirq
;
222 info
->u
.pirq
.gsi
= gsi
;
223 info
->u
.pirq
.domid
= domid
;
224 info
->u
.pirq
.flags
= flags
;
228 * Accessors for packed IRQ information.
230 static unsigned int evtchn_from_irq(unsigned irq
)
232 if (unlikely(WARN(irq
< 0 || irq
>= nr_irqs
, "Invalid irq %d!\n", irq
)))
235 return info_for_irq(irq
)->evtchn
;
238 unsigned irq_from_evtchn(unsigned int evtchn
)
240 return evtchn_to_irq
[evtchn
];
242 EXPORT_SYMBOL_GPL(irq_from_evtchn
);
244 static enum ipi_vector
ipi_from_irq(unsigned irq
)
246 struct irq_info
*info
= info_for_irq(irq
);
248 BUG_ON(info
== NULL
);
249 BUG_ON(info
->type
!= IRQT_IPI
);
254 static unsigned virq_from_irq(unsigned irq
)
256 struct irq_info
*info
= info_for_irq(irq
);
258 BUG_ON(info
== NULL
);
259 BUG_ON(info
->type
!= IRQT_VIRQ
);
264 static unsigned pirq_from_irq(unsigned irq
)
266 struct irq_info
*info
= info_for_irq(irq
);
268 BUG_ON(info
== NULL
);
269 BUG_ON(info
->type
!= IRQT_PIRQ
);
271 return info
->u
.pirq
.pirq
;
274 static enum xen_irq_type
type_from_irq(unsigned irq
)
276 return info_for_irq(irq
)->type
;
279 static unsigned cpu_from_irq(unsigned irq
)
281 return info_for_irq(irq
)->cpu
;
284 static unsigned int cpu_from_evtchn(unsigned int evtchn
)
286 int irq
= evtchn_to_irq
[evtchn
];
290 ret
= cpu_from_irq(irq
);
296 static bool pirq_check_eoi_map(unsigned irq
)
298 return test_bit(pirq_from_irq(irq
), pirq_eoi_map
);
302 static bool pirq_needs_eoi_flag(unsigned irq
)
304 struct irq_info
*info
= info_for_irq(irq
);
305 BUG_ON(info
->type
!= IRQT_PIRQ
);
307 return info
->u
.pirq
.flags
& PIRQ_NEEDS_EOI
;
310 static inline xen_ulong_t
active_evtchns(unsigned int cpu
,
311 struct shared_info
*sh
,
314 return sh
->evtchn_pending
[idx
] &
315 per_cpu(cpu_evtchn_mask
, cpu
)[idx
] &
316 ~sh
->evtchn_mask
[idx
];
319 static void bind_evtchn_to_cpu(unsigned int chn
, unsigned int cpu
)
321 int irq
= evtchn_to_irq
[chn
];
325 cpumask_copy(irq_to_desc(irq
)->irq_data
.affinity
, cpumask_of(cpu
));
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
)));
331 info_for_irq(irq
)->cpu
= cpu
;
334 static void init_evtchn_cpu_bindings(void)
338 struct irq_info
*info
;
340 /* By default all event channels notify CPU#0. */
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));
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
)));
352 static inline void clear_evtchn(int port
)
354 struct shared_info
*s
= HYPERVISOR_shared_info
;
355 sync_clear_bit(port
, BM(&s
->evtchn_pending
[0]));
358 static inline void set_evtchn(int port
)
360 struct shared_info
*s
= HYPERVISOR_shared_info
;
361 sync_set_bit(port
, BM(&s
->evtchn_pending
[0]));
364 static inline int test_evtchn(int port
)
366 struct shared_info
*s
= HYPERVISOR_shared_info
;
367 return sync_test_bit(port
, BM(&s
->evtchn_pending
[0]));
372 * notify_remote_via_irq - send event to remote end of event channel via irq
373 * @irq: irq of event channel to send event to
375 * Unlike notify_remote_via_evtchn(), this is safe to use across
376 * save/restore. Notifications on a broken connection are silently
379 void notify_remote_via_irq(int irq
)
381 int evtchn
= evtchn_from_irq(irq
);
383 if (VALID_EVTCHN(evtchn
))
384 notify_remote_via_evtchn(evtchn
);
386 EXPORT_SYMBOL_GPL(notify_remote_via_irq
);
388 static void mask_evtchn(int port
)
390 struct shared_info
*s
= HYPERVISOR_shared_info
;
391 sync_set_bit(port
, BM(&s
->evtchn_mask
[0]));
394 static void unmask_evtchn(int port
)
396 struct shared_info
*s
= HYPERVISOR_shared_info
;
397 unsigned int cpu
= get_cpu();
398 int do_hypercall
= 0, evtchn_pending
= 0;
400 BUG_ON(!irqs_disabled());
402 if (unlikely((cpu
!= cpu_from_evtchn(port
))))
406 * Need to clear the mask before checking pending to
407 * avoid a race with an event becoming pending.
409 * EVTCHNOP_unmask will only trigger an upcall if the
410 * mask bit was set, so if a hypercall is needed
413 sync_clear_bit(port
, BM(&s
->evtchn_mask
[0]));
414 evtchn_pending
= sync_test_bit(port
, BM(&s
->evtchn_pending
[0]));
416 if (unlikely(evtchn_pending
&& xen_hvm_domain())) {
417 sync_set_bit(port
, BM(&s
->evtchn_mask
[0]));
422 /* Slow path (hypercall) if this is a non-local port or if this is
423 * an hvm domain and an event is pending (hvm domains don't have
424 * their own implementation of irq_enable). */
426 struct evtchn_unmask unmask
= { .port
= port
};
427 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask
, &unmask
);
429 struct vcpu_info
*vcpu_info
= __this_cpu_read(xen_vcpu
);
432 * The following is basically the equivalent of
433 * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
434 * the interrupt edge' if the channel is masked.
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;
445 static void xen_irq_init(unsigned irq
)
447 struct irq_info
*info
;
449 struct irq_desc
*desc
= irq_to_desc(irq
);
451 /* By default all event channels notify CPU#0. */
452 cpumask_copy(desc
->irq_data
.affinity
, cpumask_of(0));
455 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
457 panic("Unable to allocate metadata for IRQ%d\n", irq
);
459 info
->type
= IRQT_UNBOUND
;
462 irq_set_handler_data(irq
, info
);
464 list_add_tail(&info
->list
, &xen_irq_list_head
);
467 static int __must_check
xen_allocate_irq_dynamic(void)
472 #ifdef CONFIG_X86_IO_APIC
474 * For an HVM guest or domain 0 which see "real" (emulated or
475 * actual respectively) GSIs we allocate dynamic IRQs
476 * e.g. those corresponding to event channels or MSIs
477 * etc. from the range above those "real" GSIs to avoid
480 if (xen_initial_domain() || xen_hvm_domain())
481 first
= get_nr_irqs_gsi();
484 irq
= irq_alloc_desc_from(first
, -1);
492 static int __must_check
xen_allocate_irq_gsi(unsigned gsi
)
497 * A PV guest has no concept of a GSI (since it has no ACPI
498 * nor access to/knowledge of the physical APICs). Therefore
499 * all IRQs are dynamically allocated from the entire IRQ
502 if (xen_pv_domain() && !xen_initial_domain())
503 return xen_allocate_irq_dynamic();
505 /* Legacy IRQ descriptors are already allocated by the arch. */
506 if (gsi
< NR_IRQS_LEGACY
)
509 irq
= irq_alloc_desc_at(gsi
, -1);
516 static void xen_free_irq(unsigned irq
)
518 struct irq_info
*info
= irq_get_handler_data(irq
);
523 list_del(&info
->list
);
525 irq_set_handler_data(irq
, NULL
);
527 WARN_ON(info
->refcnt
> 0);
531 /* Legacy IRQ descriptors are managed by the arch. */
532 if (irq
< NR_IRQS_LEGACY
)
538 static void pirq_query_unmask(int irq
)
540 struct physdev_irq_status_query irq_status
;
541 struct irq_info
*info
= info_for_irq(irq
);
543 BUG_ON(info
->type
!= IRQT_PIRQ
);
545 irq_status
.irq
= pirq_from_irq(irq
);
546 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query
, &irq_status
))
547 irq_status
.flags
= 0;
549 info
->u
.pirq
.flags
&= ~PIRQ_NEEDS_EOI
;
550 if (irq_status
.flags
& XENIRQSTAT_needs_eoi
)
551 info
->u
.pirq
.flags
|= PIRQ_NEEDS_EOI
;
554 static bool probing_irq(int irq
)
556 struct irq_desc
*desc
= irq_to_desc(irq
);
558 return desc
&& desc
->action
== NULL
;
561 static void eoi_pirq(struct irq_data
*data
)
563 int evtchn
= evtchn_from_irq(data
->irq
);
564 struct physdev_eoi eoi
= { .irq
= pirq_from_irq(data
->irq
) };
569 if (VALID_EVTCHN(evtchn
))
570 clear_evtchn(evtchn
);
572 if (pirq_needs_eoi(data
->irq
)) {
573 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_eoi
, &eoi
);
578 static void mask_ack_pirq(struct irq_data
*data
)
580 disable_dynirq(data
);
584 static unsigned int __startup_pirq(unsigned int irq
)
586 struct evtchn_bind_pirq bind_pirq
;
587 struct irq_info
*info
= info_for_irq(irq
);
588 int evtchn
= evtchn_from_irq(irq
);
591 BUG_ON(info
->type
!= IRQT_PIRQ
);
593 if (VALID_EVTCHN(evtchn
))
596 bind_pirq
.pirq
= pirq_from_irq(irq
);
597 /* NB. We are happy to share unless we are probing. */
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
);
602 if (!probing_irq(irq
))
603 printk(KERN_INFO
"Failed to obtain physical IRQ %d\n",
607 evtchn
= bind_pirq
.port
;
609 pirq_query_unmask(irq
);
611 evtchn_to_irq
[evtchn
] = irq
;
612 bind_evtchn_to_cpu(evtchn
, 0);
613 info
->evtchn
= evtchn
;
616 unmask_evtchn(evtchn
);
617 eoi_pirq(irq_get_irq_data(irq
));
622 static unsigned int startup_pirq(struct irq_data
*data
)
624 return __startup_pirq(data
->irq
);
627 static void shutdown_pirq(struct irq_data
*data
)
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
);
634 BUG_ON(info
->type
!= IRQT_PIRQ
);
636 if (!VALID_EVTCHN(evtchn
))
642 if (HYPERVISOR_event_channel_op(EVTCHNOP_close
, &close
) != 0)
645 bind_evtchn_to_cpu(evtchn
, 0);
646 evtchn_to_irq
[evtchn
] = -1;
650 static void enable_pirq(struct irq_data
*data
)
655 static void disable_pirq(struct irq_data
*data
)
657 disable_dynirq(data
);
660 int xen_irq_from_gsi(unsigned gsi
)
662 struct irq_info
*info
;
664 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
665 if (info
->type
!= IRQT_PIRQ
)
668 if (info
->u
.pirq
.gsi
== gsi
)
674 EXPORT_SYMBOL_GPL(xen_irq_from_gsi
);
677 * Do not make any assumptions regarding the relationship between the
678 * IRQ number returned here and the Xen pirq argument.
680 * Note: We don't assign an event channel until the irq actually started
681 * up. Return an existing irq if we've already got one for the gsi.
683 * Shareable implies level triggered, not shareable implies edge
686 int xen_bind_pirq_gsi_to_irq(unsigned gsi
,
687 unsigned pirq
, int shareable
, char *name
)
690 struct physdev_irq irq_op
;
692 mutex_lock(&irq_mapping_update_lock
);
694 irq
= xen_irq_from_gsi(gsi
);
696 printk(KERN_INFO
"xen_map_pirq_gsi: returning irq %d for gsi %u\n",
701 irq
= xen_allocate_irq_gsi(gsi
);
708 /* Only the privileged domain can do this. For non-priv, the pcifront
709 * driver provides a PCI bus that does the call to do exactly
710 * this in the priv domain. */
711 if (xen_initial_domain() &&
712 HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector
, &irq_op
)) {
718 xen_irq_info_pirq_init(irq
, 0, pirq
, gsi
, DOMID_SELF
,
719 shareable
? PIRQ_SHAREABLE
: 0);
721 pirq_query_unmask(irq
);
722 /* We try to use the handler with the appropriate semantic for the
723 * type of interrupt: if the interrupt is an edge triggered
724 * interrupt we use handle_edge_irq.
726 * On the other hand if the interrupt is level triggered we use
727 * handle_fasteoi_irq like the native code does for this kind of
730 * Depending on the Xen version, pirq_needs_eoi might return true
731 * not only for level triggered interrupts but for edge triggered
732 * interrupts too. In any case Xen always honors the eoi mechanism,
733 * not injecting any more pirqs of the same kind if the first one
734 * hasn't received an eoi yet. Therefore using the fasteoi handler
735 * is the right choice either way.
738 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
,
739 handle_fasteoi_irq
, name
);
741 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
,
742 handle_edge_irq
, name
);
745 mutex_unlock(&irq_mapping_update_lock
);
750 #ifdef CONFIG_PCI_MSI
751 int xen_allocate_pirq_msi(struct pci_dev
*dev
, struct msi_desc
*msidesc
)
754 struct physdev_get_free_pirq op_get_free_pirq
;
756 op_get_free_pirq
.type
= MAP_PIRQ_TYPE_MSI
;
757 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq
, &op_get_free_pirq
);
759 WARN_ONCE(rc
== -ENOSYS
,
760 "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
762 return rc
? -1 : op_get_free_pirq
.pirq
;
765 int xen_bind_pirq_msi_to_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
,
766 int pirq
, const char *name
, domid_t domid
)
770 mutex_lock(&irq_mapping_update_lock
);
772 irq
= xen_allocate_irq_dynamic();
776 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
, handle_edge_irq
,
779 xen_irq_info_pirq_init(irq
, 0, pirq
, 0, domid
, 0);
780 ret
= irq_set_msi_desc(irq
, msidesc
);
784 mutex_unlock(&irq_mapping_update_lock
);
787 mutex_unlock(&irq_mapping_update_lock
);
793 int xen_destroy_irq(int irq
)
795 struct irq_desc
*desc
;
796 struct physdev_unmap_pirq unmap_irq
;
797 struct irq_info
*info
= info_for_irq(irq
);
800 mutex_lock(&irq_mapping_update_lock
);
802 desc
= irq_to_desc(irq
);
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 /* If another domain quits without making the pci_disable_msix
811 * call, the Xen hypervisor takes care of freeing the PIRQs
812 * (free_domain_pirqs).
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
);
818 printk(KERN_WARNING
"unmap irq failed %d\n", rc
);
826 mutex_unlock(&irq_mapping_update_lock
);
830 int xen_irq_from_pirq(unsigned pirq
)
834 struct irq_info
*info
;
836 mutex_lock(&irq_mapping_update_lock
);
838 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
839 if (info
->type
!= IRQT_PIRQ
)
842 if (info
->u
.pirq
.pirq
== pirq
)
847 mutex_unlock(&irq_mapping_update_lock
);
853 int xen_pirq_from_irq(unsigned irq
)
855 return pirq_from_irq(irq
);
857 EXPORT_SYMBOL_GPL(xen_pirq_from_irq
);
858 int bind_evtchn_to_irq(unsigned int evtchn
)
862 mutex_lock(&irq_mapping_update_lock
);
864 irq
= evtchn_to_irq
[evtchn
];
867 irq
= xen_allocate_irq_dynamic();
871 irq_set_chip_and_handler_name(irq
, &xen_dynamic_chip
,
872 handle_edge_irq
, "event");
874 xen_irq_info_evtchn_init(irq
, evtchn
);
876 struct irq_info
*info
= info_for_irq(irq
);
877 WARN_ON(info
== NULL
|| info
->type
!= IRQT_EVTCHN
);
881 mutex_unlock(&irq_mapping_update_lock
);
885 EXPORT_SYMBOL_GPL(bind_evtchn_to_irq
);
887 static int bind_ipi_to_irq(unsigned int ipi
, unsigned int cpu
)
889 struct evtchn_bind_ipi bind_ipi
;
892 mutex_lock(&irq_mapping_update_lock
);
894 irq
= per_cpu(ipi_to_irq
, cpu
)[ipi
];
897 irq
= xen_allocate_irq_dynamic();
901 irq_set_chip_and_handler_name(irq
, &xen_percpu_chip
,
902 handle_percpu_irq
, "ipi");
905 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi
,
908 evtchn
= bind_ipi
.port
;
910 xen_irq_info_ipi_init(cpu
, irq
, evtchn
, ipi
);
912 bind_evtchn_to_cpu(evtchn
, cpu
);
914 struct irq_info
*info
= info_for_irq(irq
);
915 WARN_ON(info
== NULL
|| info
->type
!= IRQT_IPI
);
919 mutex_unlock(&irq_mapping_update_lock
);
923 static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain
,
924 unsigned int remote_port
)
926 struct evtchn_bind_interdomain bind_interdomain
;
929 bind_interdomain
.remote_dom
= remote_domain
;
930 bind_interdomain
.remote_port
= remote_port
;
932 err
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain
,
935 return err
? : bind_evtchn_to_irq(bind_interdomain
.local_port
);
938 static int find_virq(unsigned int virq
, unsigned int cpu
)
940 struct evtchn_status status
;
941 int port
, rc
= -ENOENT
;
943 memset(&status
, 0, sizeof(status
));
944 for (port
= 0; port
<= NR_EVENT_CHANNELS
; port
++) {
945 status
.dom
= DOMID_SELF
;
947 rc
= HYPERVISOR_event_channel_op(EVTCHNOP_status
, &status
);
950 if (status
.status
!= EVTCHNSTAT_virq
)
952 if (status
.u
.virq
== virq
&& status
.vcpu
== cpu
) {
960 int bind_virq_to_irq(unsigned int virq
, unsigned int cpu
)
962 struct evtchn_bind_virq bind_virq
;
963 int evtchn
, irq
, ret
;
965 mutex_lock(&irq_mapping_update_lock
);
967 irq
= per_cpu(virq_to_irq
, cpu
)[virq
];
970 irq
= xen_allocate_irq_dynamic();
974 irq_set_chip_and_handler_name(irq
, &xen_percpu_chip
,
975 handle_percpu_irq
, "virq");
977 bind_virq
.virq
= virq
;
978 bind_virq
.vcpu
= cpu
;
979 ret
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq
,
982 evtchn
= bind_virq
.port
;
985 ret
= find_virq(virq
, cpu
);
990 xen_irq_info_virq_init(cpu
, irq
, evtchn
, virq
);
992 bind_evtchn_to_cpu(evtchn
, cpu
);
994 struct irq_info
*info
= info_for_irq(irq
);
995 WARN_ON(info
== NULL
|| info
->type
!= IRQT_VIRQ
);
999 mutex_unlock(&irq_mapping_update_lock
);
1004 static void unbind_from_irq(unsigned int irq
)
1006 struct evtchn_close close
;
1007 int evtchn
= evtchn_from_irq(irq
);
1008 struct irq_info
*info
= irq_get_handler_data(irq
);
1013 mutex_lock(&irq_mapping_update_lock
);
1015 if (info
->refcnt
> 0) {
1017 if (info
->refcnt
!= 0)
1021 if (VALID_EVTCHN(evtchn
)) {
1022 close
.port
= evtchn
;
1023 if (HYPERVISOR_event_channel_op(EVTCHNOP_close
, &close
) != 0)
1026 switch (type_from_irq(irq
)) {
1028 per_cpu(virq_to_irq
, cpu_from_evtchn(evtchn
))
1029 [virq_from_irq(irq
)] = -1;
1032 per_cpu(ipi_to_irq
, cpu_from_evtchn(evtchn
))
1033 [ipi_from_irq(irq
)] = -1;
1039 /* Closed ports are implicitly re-bound to VCPU0. */
1040 bind_evtchn_to_cpu(evtchn
, 0);
1042 evtchn_to_irq
[evtchn
] = -1;
1045 BUG_ON(info_for_irq(irq
)->type
== IRQT_UNBOUND
);
1050 mutex_unlock(&irq_mapping_update_lock
);
1053 int bind_evtchn_to_irqhandler(unsigned int evtchn
,
1054 irq_handler_t handler
,
1055 unsigned long irqflags
,
1056 const char *devname
, void *dev_id
)
1060 irq
= bind_evtchn_to_irq(evtchn
);
1063 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1065 unbind_from_irq(irq
);
1071 EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler
);
1073 int 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
,
1082 irq
= bind_interdomain_evtchn_to_irq(remote_domain
, remote_port
);
1086 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1088 unbind_from_irq(irq
);
1094 EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler
);
1096 int 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
)
1102 irq
= bind_virq_to_irq(virq
, cpu
);
1105 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1107 unbind_from_irq(irq
);
1113 EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler
);
1115 int bind_ipi_to_irqhandler(enum ipi_vector ipi
,
1117 irq_handler_t handler
,
1118 unsigned long irqflags
,
1119 const char *devname
,
1124 irq
= bind_ipi_to_irq(ipi
, cpu
);
1128 irqflags
|= IRQF_NO_SUSPEND
| IRQF_FORCE_RESUME
| IRQF_EARLY_RESUME
;
1129 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1131 unbind_from_irq(irq
);
1138 void unbind_from_irqhandler(unsigned int irq
, void *dev_id
)
1140 struct irq_info
*info
= irq_get_handler_data(irq
);
1144 free_irq(irq
, dev_id
);
1145 unbind_from_irq(irq
);
1147 EXPORT_SYMBOL_GPL(unbind_from_irqhandler
);
1149 int evtchn_make_refcounted(unsigned int evtchn
)
1151 int irq
= evtchn_to_irq
[evtchn
];
1152 struct irq_info
*info
;
1157 info
= irq_get_handler_data(irq
);
1162 WARN_ON(info
->refcnt
!= -1);
1168 EXPORT_SYMBOL_GPL(evtchn_make_refcounted
);
1170 int evtchn_get(unsigned int evtchn
)
1173 struct irq_info
*info
;
1176 if (evtchn
>= NR_EVENT_CHANNELS
)
1179 mutex_lock(&irq_mapping_update_lock
);
1181 irq
= evtchn_to_irq
[evtchn
];
1185 info
= irq_get_handler_data(irq
);
1191 if (info
->refcnt
<= 0)
1197 mutex_unlock(&irq_mapping_update_lock
);
1201 EXPORT_SYMBOL_GPL(evtchn_get
);
1203 void evtchn_put(unsigned int evtchn
)
1205 int irq
= evtchn_to_irq
[evtchn
];
1206 if (WARN_ON(irq
== -1))
1208 unbind_from_irq(irq
);
1210 EXPORT_SYMBOL_GPL(evtchn_put
);
1212 void xen_send_IPI_one(unsigned int cpu
, enum ipi_vector vector
)
1214 int irq
= per_cpu(ipi_to_irq
, cpu
)[vector
];
1216 notify_remote_via_irq(irq
);
1219 irqreturn_t
xen_debug_interrupt(int irq
, void *dev_id
)
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
);
1225 unsigned long flags
;
1226 static DEFINE_SPINLOCK(debug_lock
);
1227 struct vcpu_info
*v
;
1229 spin_lock_irqsave(&debug_lock
, flags
);
1231 printk("\nvcpu %d\n ", cpu
);
1233 for_each_online_cpu(i
) {
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
);
1244 v
= per_cpu(xen_vcpu
, cpu
);
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),
1257 i
% 8 == 0 ? "\n " : " ");
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 " : " ");
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),
1270 i
% 8 == 0 ? "\n " : " ");
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
]
1277 printk("%0*"PRI_xen_ulong
"%s",
1278 (int)(sizeof(sh
->evtchn_mask
[0])*2),
1279 pending
, i
% 8 == 0 ? "\n " : " ");
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
,
1289 sync_test_bit(word_idx
, BM(&v
->evtchn_pending_sel
))
1291 !sync_test_bit(i
, BM(sh
->evtchn_mask
))
1292 ? "" : " globally-masked",
1293 sync_test_bit(i
, BM(cpu_evtchn
))
1294 ? "" : " locally-masked");
1298 spin_unlock_irqrestore(&debug_lock
, flags
);
1303 static DEFINE_PER_CPU(unsigned, xed_nesting_count
);
1304 static DEFINE_PER_CPU(unsigned int, current_word_idx
);
1305 static DEFINE_PER_CPU(unsigned int, current_bit_idx
);
1308 * Mask out the i least significant bits of w
1310 #define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
1313 * Search the CPUs pending events bitmasks. For each one found, map
1314 * the event number to an irq, and feed it into do_IRQ() for
1317 * Xen uses a two-level bitmap to speed searching. The first level is
1318 * a bitset of words which contain pending event bits. The second
1319 * level is a bitset of pending events themselves.
1321 static void __xen_evtchn_do_upcall(void)
1323 int start_word_idx
, start_bit_idx
;
1324 int word_idx
, bit_idx
;
1326 int cpu
= get_cpu();
1327 struct shared_info
*s
= HYPERVISOR_shared_info
;
1328 struct vcpu_info
*vcpu_info
= __this_cpu_read(xen_vcpu
);
1332 xen_ulong_t pending_words
;
1333 xen_ulong_t pending_bits
;
1334 struct irq_desc
*desc
;
1336 vcpu_info
->evtchn_upcall_pending
= 0;
1338 if (__this_cpu_inc_return(xed_nesting_count
) - 1)
1342 * Master flag must be cleared /before/ clearing
1343 * selector flag. xchg_xen_ulong must contain an
1344 * appropriate barrier.
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
);
1353 generic_handle_irq_desc(irq
, desc
);
1357 pending_words
= xchg_xen_ulong(&vcpu_info
->evtchn_pending_sel
, 0);
1359 start_word_idx
= __this_cpu_read(current_word_idx
);
1360 start_bit_idx
= __this_cpu_read(current_bit_idx
);
1362 word_idx
= start_word_idx
;
1364 for (i
= 0; pending_words
!= 0; i
++) {
1367 words
= MASK_LSBS(pending_words
, word_idx
);
1370 * If we masked out all events, wrap to beginning.
1377 word_idx
= EVTCHN_FIRST_BIT(words
);
1379 pending_bits
= active_evtchns(cpu
, s
, word_idx
);
1380 bit_idx
= 0; /* usually scan entire word from start */
1381 if (word_idx
== start_word_idx
) {
1382 /* We scan the starting word in two parts */
1384 /* 1st time: start in the middle */
1385 bit_idx
= start_bit_idx
;
1387 /* 2nd time: mask bits done already */
1388 bit_idx
&= (1UL << start_bit_idx
) - 1;
1395 bits
= MASK_LSBS(pending_bits
, bit_idx
);
1397 /* If we masked out all events, move on. */
1401 bit_idx
= EVTCHN_FIRST_BIT(bits
);
1404 port
= (word_idx
* BITS_PER_EVTCHN_WORD
) + bit_idx
;
1405 irq
= evtchn_to_irq
[port
];
1408 desc
= irq_to_desc(irq
);
1410 generic_handle_irq_desc(irq
, desc
);
1413 bit_idx
= (bit_idx
+ 1) % BITS_PER_EVTCHN_WORD
;
1415 /* Next caller starts at last processed + 1 */
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);
1422 /* Scan start_l1i twice; all others once. */
1423 if ((word_idx
!= start_word_idx
) || (i
!= 0))
1424 pending_words
&= ~(1UL << word_idx
);
1426 word_idx
= (word_idx
+ 1) % BITS_PER_EVTCHN_WORD
;
1429 BUG_ON(!irqs_disabled());
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
);
1440 void xen_evtchn_do_upcall(struct pt_regs
*regs
)
1442 struct pt_regs
*old_regs
= set_irq_regs(regs
);
1449 __xen_evtchn_do_upcall();
1452 set_irq_regs(old_regs
);
1455 void xen_hvm_evtchn_do_upcall(void)
1457 __xen_evtchn_do_upcall();
1459 EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall
);
1461 /* Rebind a new event channel to an existing irq. */
1462 void rebind_evtchn_irq(int evtchn
, int irq
)
1464 struct irq_info
*info
= info_for_irq(irq
);
1469 /* Make sure the irq is masked, since the new event channel
1470 will also be masked. */
1473 mutex_lock(&irq_mapping_update_lock
);
1475 /* After resume the irq<->evtchn mappings are all cleared out */
1476 BUG_ON(evtchn_to_irq
[evtchn
] != -1);
1477 /* Expect irq to have been bound before,
1478 so there should be a proper type */
1479 BUG_ON(info
->type
== IRQT_UNBOUND
);
1481 xen_irq_info_evtchn_init(irq
, evtchn
);
1483 mutex_unlock(&irq_mapping_update_lock
);
1485 /* new event channels are always bound to cpu 0 */
1486 irq_set_affinity(irq
, cpumask_of(0));
1488 /* Unmask the event channel. */
1492 /* Rebind an evtchn so that it gets delivered to a specific cpu */
1493 static int rebind_irq_to_cpu(unsigned irq
, unsigned tcpu
)
1495 struct evtchn_bind_vcpu bind_vcpu
;
1496 int evtchn
= evtchn_from_irq(irq
);
1498 if (!VALID_EVTCHN(evtchn
))
1502 * Events delivered via platform PCI interrupts are always
1503 * routed to vcpu 0 and hence cannot be rebound.
1505 if (xen_hvm_domain() && !xen_have_vector_callback
)
1508 /* Send future instances of this interrupt to other vcpu. */
1509 bind_vcpu
.port
= evtchn
;
1510 bind_vcpu
.vcpu
= tcpu
;
1513 * If this fails, it usually just indicates that we're dealing with a
1514 * virq or IPI channel, which don't actually need to be rebound. Ignore
1515 * it, but don't do the xenlinux-level rebind in that case.
1517 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu
, &bind_vcpu
) >= 0)
1518 bind_evtchn_to_cpu(evtchn
, tcpu
);
1523 static int set_affinity_irq(struct irq_data
*data
, const struct cpumask
*dest
,
1526 unsigned tcpu
= cpumask_first(dest
);
1528 return rebind_irq_to_cpu(data
->irq
, tcpu
);
1531 int resend_irq_on_evtchn(unsigned int irq
)
1533 int masked
, evtchn
= evtchn_from_irq(irq
);
1534 struct shared_info
*s
= HYPERVISOR_shared_info
;
1536 if (!VALID_EVTCHN(evtchn
))
1539 masked
= sync_test_and_set_bit(evtchn
, BM(s
->evtchn_mask
));
1540 sync_set_bit(evtchn
, BM(s
->evtchn_pending
));
1542 unmask_evtchn(evtchn
);
1547 static void enable_dynirq(struct irq_data
*data
)
1549 int evtchn
= evtchn_from_irq(data
->irq
);
1551 if (VALID_EVTCHN(evtchn
))
1552 unmask_evtchn(evtchn
);
1555 static void disable_dynirq(struct irq_data
*data
)
1557 int evtchn
= evtchn_from_irq(data
->irq
);
1559 if (VALID_EVTCHN(evtchn
))
1560 mask_evtchn(evtchn
);
1563 static void ack_dynirq(struct irq_data
*data
)
1565 int evtchn
= evtchn_from_irq(data
->irq
);
1569 if (VALID_EVTCHN(evtchn
))
1570 clear_evtchn(evtchn
);
1573 static void mask_ack_dynirq(struct irq_data
*data
)
1575 disable_dynirq(data
);
1579 static int retrigger_dynirq(struct irq_data
*data
)
1581 int evtchn
= evtchn_from_irq(data
->irq
);
1582 struct shared_info
*sh
= HYPERVISOR_shared_info
;
1585 if (VALID_EVTCHN(evtchn
)) {
1588 masked
= sync_test_and_set_bit(evtchn
, BM(sh
->evtchn_mask
));
1589 sync_set_bit(evtchn
, BM(sh
->evtchn_pending
));
1591 unmask_evtchn(evtchn
);
1598 static void restore_pirqs(void)
1600 int pirq
, rc
, irq
, gsi
;
1601 struct physdev_map_pirq map_irq
;
1602 struct irq_info
*info
;
1604 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
1605 if (info
->type
!= IRQT_PIRQ
)
1608 pirq
= info
->u
.pirq
.pirq
;
1609 gsi
= info
->u
.pirq
.gsi
;
1612 /* save/restore of PT devices doesn't work, so at this point the
1613 * only devices present are GSI based emulated devices */
1617 map_irq
.domid
= DOMID_SELF
;
1618 map_irq
.type
= MAP_PIRQ_TYPE_GSI
;
1619 map_irq
.index
= gsi
;
1620 map_irq
.pirq
= pirq
;
1622 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq
, &map_irq
);
1624 printk(KERN_WARNING
"xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
1625 gsi
, irq
, pirq
, rc
);
1630 printk(KERN_DEBUG
"xen: --> irq=%d, pirq=%d\n", irq
, map_irq
.pirq
);
1632 __startup_pirq(irq
);
1636 static void restore_cpu_virqs(unsigned int cpu
)
1638 struct evtchn_bind_virq bind_virq
;
1639 int virq
, irq
, evtchn
;
1641 for (virq
= 0; virq
< NR_VIRQS
; virq
++) {
1642 if ((irq
= per_cpu(virq_to_irq
, cpu
)[virq
]) == -1)
1645 BUG_ON(virq_from_irq(irq
) != virq
);
1647 /* Get a new binding from Xen. */
1648 bind_virq
.virq
= virq
;
1649 bind_virq
.vcpu
= cpu
;
1650 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq
,
1653 evtchn
= bind_virq
.port
;
1655 /* Record the new mapping. */
1656 xen_irq_info_virq_init(cpu
, irq
, evtchn
, virq
);
1657 bind_evtchn_to_cpu(evtchn
, cpu
);
1661 static void restore_cpu_ipis(unsigned int cpu
)
1663 struct evtchn_bind_ipi bind_ipi
;
1664 int ipi
, irq
, evtchn
;
1666 for (ipi
= 0; ipi
< XEN_NR_IPIS
; ipi
++) {
1667 if ((irq
= per_cpu(ipi_to_irq
, cpu
)[ipi
]) == -1)
1670 BUG_ON(ipi_from_irq(irq
) != ipi
);
1672 /* Get a new binding from Xen. */
1673 bind_ipi
.vcpu
= cpu
;
1674 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi
,
1677 evtchn
= bind_ipi
.port
;
1679 /* Record the new mapping. */
1680 xen_irq_info_ipi_init(cpu
, irq
, evtchn
, ipi
);
1681 bind_evtchn_to_cpu(evtchn
, cpu
);
1685 /* Clear an irq's pending state, in preparation for polling on it */
1686 void xen_clear_irq_pending(int irq
)
1688 int evtchn
= evtchn_from_irq(irq
);
1690 if (VALID_EVTCHN(evtchn
))
1691 clear_evtchn(evtchn
);
1693 EXPORT_SYMBOL(xen_clear_irq_pending
);
1694 void xen_set_irq_pending(int irq
)
1696 int evtchn
= evtchn_from_irq(irq
);
1698 if (VALID_EVTCHN(evtchn
))
1702 bool xen_test_irq_pending(int irq
)
1704 int evtchn
= evtchn_from_irq(irq
);
1707 if (VALID_EVTCHN(evtchn
))
1708 ret
= test_evtchn(evtchn
);
1713 /* Poll waiting for an irq to become pending with timeout. In the usual case,
1714 * the irq will be disabled so it won't deliver an interrupt. */
1715 void xen_poll_irq_timeout(int irq
, u64 timeout
)
1717 evtchn_port_t evtchn
= evtchn_from_irq(irq
);
1719 if (VALID_EVTCHN(evtchn
)) {
1720 struct sched_poll poll
;
1723 poll
.timeout
= timeout
;
1724 set_xen_guest_handle(poll
.ports
, &evtchn
);
1726 if (HYPERVISOR_sched_op(SCHEDOP_poll
, &poll
) != 0)
1730 EXPORT_SYMBOL(xen_poll_irq_timeout
);
1731 /* Poll waiting for an irq to become pending. In the usual case, the
1732 * irq will be disabled so it won't deliver an interrupt. */
1733 void xen_poll_irq(int irq
)
1735 xen_poll_irq_timeout(irq
, 0 /* no timeout */);
1738 /* Check whether the IRQ line is shared with other guests. */
1739 int xen_test_irq_shared(int irq
)
1741 struct irq_info
*info
= info_for_irq(irq
);
1742 struct physdev_irq_status_query irq_status
;
1747 irq_status
.irq
= info
->u
.pirq
.pirq
;
1749 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query
, &irq_status
))
1751 return !(irq_status
.flags
& XENIRQSTAT_shared
);
1753 EXPORT_SYMBOL_GPL(xen_test_irq_shared
);
1755 void xen_irq_resume(void)
1757 unsigned int cpu
, evtchn
;
1758 struct irq_info
*info
;
1760 init_evtchn_cpu_bindings();
1762 /* New event-channel space is not 'live' yet. */
1763 for (evtchn
= 0; evtchn
< NR_EVENT_CHANNELS
; evtchn
++)
1764 mask_evtchn(evtchn
);
1766 /* No IRQ <-> event-channel mappings. */
1767 list_for_each_entry(info
, &xen_irq_list_head
, list
)
1768 info
->evtchn
= 0; /* zap event-channel binding */
1770 for (evtchn
= 0; evtchn
< NR_EVENT_CHANNELS
; evtchn
++)
1771 evtchn_to_irq
[evtchn
] = -1;
1773 for_each_possible_cpu(cpu
) {
1774 restore_cpu_virqs(cpu
);
1775 restore_cpu_ipis(cpu
);
1781 static struct irq_chip xen_dynamic_chip __read_mostly
= {
1784 .irq_disable
= disable_dynirq
,
1785 .irq_mask
= disable_dynirq
,
1786 .irq_unmask
= enable_dynirq
,
1788 .irq_ack
= ack_dynirq
,
1789 .irq_mask_ack
= mask_ack_dynirq
,
1791 .irq_set_affinity
= set_affinity_irq
,
1792 .irq_retrigger
= retrigger_dynirq
,
1795 static struct irq_chip xen_pirq_chip __read_mostly
= {
1798 .irq_startup
= startup_pirq
,
1799 .irq_shutdown
= shutdown_pirq
,
1800 .irq_enable
= enable_pirq
,
1801 .irq_disable
= disable_pirq
,
1803 .irq_mask
= disable_dynirq
,
1804 .irq_unmask
= enable_dynirq
,
1806 .irq_ack
= eoi_pirq
,
1807 .irq_eoi
= eoi_pirq
,
1808 .irq_mask_ack
= mask_ack_pirq
,
1810 .irq_set_affinity
= set_affinity_irq
,
1812 .irq_retrigger
= retrigger_dynirq
,
1815 static struct irq_chip xen_percpu_chip __read_mostly
= {
1816 .name
= "xen-percpu",
1818 .irq_disable
= disable_dynirq
,
1819 .irq_mask
= disable_dynirq
,
1820 .irq_unmask
= enable_dynirq
,
1822 .irq_ack
= ack_dynirq
,
1825 int xen_set_callback_via(uint64_t via
)
1827 struct xen_hvm_param a
;
1828 a
.domid
= DOMID_SELF
;
1829 a
.index
= HVM_PARAM_CALLBACK_IRQ
;
1831 return HYPERVISOR_hvm_op(HVMOP_set_param
, &a
);
1833 EXPORT_SYMBOL_GPL(xen_set_callback_via
);
1835 #ifdef CONFIG_XEN_PVHVM
1836 /* Vector callbacks are better than PCI interrupts to receive event
1837 * channel notifications because we can receive vector callbacks on any
1838 * vcpu and we don't need PCI support or APIC interactions. */
1839 void xen_callback_vector(void)
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
);
1847 printk(KERN_ERR
"Request for Xen HVM callback vector"
1849 xen_have_vector_callback
= 0;
1852 printk(KERN_INFO
"Xen HVM callback vector for event delivery is "
1854 /* in the restore case the vector has already been allocated */
1855 if (!test_bit(HYPERVISOR_CALLBACK_VECTOR
, used_vectors
))
1856 alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR
,
1857 xen_hvm_callback_vector
);
1861 void xen_callback_vector(void) {}
1864 void __init
xen_init_IRQ(void)
1868 evtchn_to_irq
= kcalloc(NR_EVENT_CHANNELS
, sizeof(*evtchn_to_irq
),
1870 BUG_ON(!evtchn_to_irq
);
1871 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++)
1872 evtchn_to_irq
[i
] = -1;
1874 init_evtchn_cpu_bindings();
1876 /* No event channels are 'live' right now. */
1877 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++)
1880 pirq_needs_eoi
= pirq_needs_eoi_flag
;
1883 if (xen_hvm_domain()) {
1884 xen_callback_vector();
1886 /* pci_xen_hvm_init must be called after native_init_IRQ so that
1887 * __acpi_register_gsi can point at the right function */
1891 struct physdev_pirq_eoi_gmfn eoi_gmfn
;
1893 irq_ctx_init(smp_processor_id());
1894 if (xen_initial_domain())
1895 pci_xen_initial_domain();
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
);
1901 free_page((unsigned long) pirq_eoi_map
);
1902 pirq_eoi_map
= NULL
;
1904 pirq_needs_eoi
= pirq_check_eoi_map
;