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 - vector, with MSB being "needs EIO", or physical IRQ of the HVM
89 * guest, or GSI (real passthrough IRQ) of the device.
95 struct list_head list
;
97 enum xen_irq_type type
; /* type */
99 unsigned short evtchn
; /* event channel */
100 unsigned short cpu
; /* cpu bound */
108 unsigned char vector
;
114 #define PIRQ_NEEDS_EOI (1 << 0)
115 #define PIRQ_SHAREABLE (1 << 1)
117 static int *evtchn_to_irq
;
119 static unsigned long *pirq_eoi_map
;
121 static bool (*pirq_needs_eoi
)(unsigned irq
);
123 static DEFINE_PER_CPU(unsigned long [NR_EVENT_CHANNELS
/BITS_PER_LONG
],
126 /* Xen will never allocate port zero for any purpose. */
127 #define VALID_EVTCHN(chn) ((chn) != 0)
129 static struct irq_chip xen_dynamic_chip
;
130 static struct irq_chip xen_percpu_chip
;
131 static struct irq_chip xen_pirq_chip
;
132 static void enable_dynirq(struct irq_data
*data
);
133 static void disable_dynirq(struct irq_data
*data
);
135 /* Get info for IRQ */
136 static struct irq_info
*info_for_irq(unsigned irq
)
138 return irq_get_handler_data(irq
);
141 /* Constructors for packed IRQ information. */
142 static void xen_irq_info_common_init(struct irq_info
*info
,
144 enum xen_irq_type type
,
145 unsigned short evtchn
,
149 BUG_ON(info
->type
!= IRQT_UNBOUND
&& info
->type
!= type
);
153 info
->evtchn
= evtchn
;
156 evtchn_to_irq
[evtchn
] = irq
;
159 static void xen_irq_info_evtchn_init(unsigned irq
,
160 unsigned short evtchn
)
162 struct irq_info
*info
= info_for_irq(irq
);
164 xen_irq_info_common_init(info
, irq
, IRQT_EVTCHN
, evtchn
, 0);
167 static void xen_irq_info_ipi_init(unsigned cpu
,
169 unsigned short evtchn
,
172 struct irq_info
*info
= info_for_irq(irq
);
174 xen_irq_info_common_init(info
, irq
, IRQT_IPI
, evtchn
, 0);
178 per_cpu(ipi_to_irq
, cpu
)[ipi
] = irq
;
181 static void xen_irq_info_virq_init(unsigned cpu
,
183 unsigned short evtchn
,
186 struct irq_info
*info
= info_for_irq(irq
);
188 xen_irq_info_common_init(info
, irq
, IRQT_VIRQ
, evtchn
, 0);
192 per_cpu(virq_to_irq
, cpu
)[virq
] = irq
;
195 static void xen_irq_info_pirq_init(unsigned irq
,
196 unsigned short evtchn
,
199 unsigned short vector
,
203 struct irq_info
*info
= info_for_irq(irq
);
205 xen_irq_info_common_init(info
, irq
, IRQT_PIRQ
, evtchn
, 0);
207 info
->u
.pirq
.pirq
= pirq
;
208 info
->u
.pirq
.gsi
= gsi
;
209 info
->u
.pirq
.vector
= vector
;
210 info
->u
.pirq
.domid
= domid
;
211 info
->u
.pirq
.flags
= flags
;
215 * Accessors for packed IRQ information.
217 static unsigned int evtchn_from_irq(unsigned irq
)
219 if (unlikely(WARN(irq
< 0 || irq
>= nr_irqs
, "Invalid irq %d!\n", irq
)))
222 return info_for_irq(irq
)->evtchn
;
225 unsigned irq_from_evtchn(unsigned int evtchn
)
227 return evtchn_to_irq
[evtchn
];
229 EXPORT_SYMBOL_GPL(irq_from_evtchn
);
231 static enum ipi_vector
ipi_from_irq(unsigned irq
)
233 struct irq_info
*info
= info_for_irq(irq
);
235 BUG_ON(info
== NULL
);
236 BUG_ON(info
->type
!= IRQT_IPI
);
241 static unsigned virq_from_irq(unsigned irq
)
243 struct irq_info
*info
= info_for_irq(irq
);
245 BUG_ON(info
== NULL
);
246 BUG_ON(info
->type
!= IRQT_VIRQ
);
251 static unsigned pirq_from_irq(unsigned irq
)
253 struct irq_info
*info
= info_for_irq(irq
);
255 BUG_ON(info
== NULL
);
256 BUG_ON(info
->type
!= IRQT_PIRQ
);
258 return info
->u
.pirq
.pirq
;
261 static enum xen_irq_type
type_from_irq(unsigned irq
)
263 return info_for_irq(irq
)->type
;
266 static unsigned cpu_from_irq(unsigned irq
)
268 return info_for_irq(irq
)->cpu
;
271 static unsigned int cpu_from_evtchn(unsigned int evtchn
)
273 int irq
= evtchn_to_irq
[evtchn
];
277 ret
= cpu_from_irq(irq
);
283 static bool pirq_check_eoi_map(unsigned irq
)
285 return test_bit(pirq_from_irq(irq
), pirq_eoi_map
);
289 static bool pirq_needs_eoi_flag(unsigned irq
)
291 struct irq_info
*info
= info_for_irq(irq
);
292 BUG_ON(info
->type
!= IRQT_PIRQ
);
294 return info
->u
.pirq
.flags
& PIRQ_NEEDS_EOI
;
297 static inline unsigned long active_evtchns(unsigned int cpu
,
298 struct shared_info
*sh
,
301 return sh
->evtchn_pending
[idx
] &
302 per_cpu(cpu_evtchn_mask
, cpu
)[idx
] &
303 ~sh
->evtchn_mask
[idx
];
306 static void bind_evtchn_to_cpu(unsigned int chn
, unsigned int cpu
)
308 int irq
= evtchn_to_irq
[chn
];
312 cpumask_copy(irq_to_desc(irq
)->irq_data
.affinity
, cpumask_of(cpu
));
315 clear_bit(chn
, per_cpu(cpu_evtchn_mask
, cpu_from_irq(irq
)));
316 set_bit(chn
, per_cpu(cpu_evtchn_mask
, cpu
));
318 info_for_irq(irq
)->cpu
= cpu
;
321 static void init_evtchn_cpu_bindings(void)
325 struct irq_info
*info
;
327 /* By default all event channels notify CPU#0. */
328 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
329 struct irq_desc
*desc
= irq_to_desc(info
->irq
);
330 cpumask_copy(desc
->irq_data
.affinity
, cpumask_of(0));
334 for_each_possible_cpu(i
)
335 memset(per_cpu(cpu_evtchn_mask
, i
),
336 (i
== 0) ? ~0 : 0, sizeof(*per_cpu(cpu_evtchn_mask
, i
)));
339 static inline void clear_evtchn(int port
)
341 struct shared_info
*s
= HYPERVISOR_shared_info
;
342 sync_clear_bit(port
, &s
->evtchn_pending
[0]);
345 static inline void set_evtchn(int port
)
347 struct shared_info
*s
= HYPERVISOR_shared_info
;
348 sync_set_bit(port
, &s
->evtchn_pending
[0]);
351 static inline int test_evtchn(int port
)
353 struct shared_info
*s
= HYPERVISOR_shared_info
;
354 return sync_test_bit(port
, &s
->evtchn_pending
[0]);
359 * notify_remote_via_irq - send event to remote end of event channel via irq
360 * @irq: irq of event channel to send event to
362 * Unlike notify_remote_via_evtchn(), this is safe to use across
363 * save/restore. Notifications on a broken connection are silently
366 void notify_remote_via_irq(int irq
)
368 int evtchn
= evtchn_from_irq(irq
);
370 if (VALID_EVTCHN(evtchn
))
371 notify_remote_via_evtchn(evtchn
);
373 EXPORT_SYMBOL_GPL(notify_remote_via_irq
);
375 static void mask_evtchn(int port
)
377 struct shared_info
*s
= HYPERVISOR_shared_info
;
378 sync_set_bit(port
, &s
->evtchn_mask
[0]);
381 static void unmask_evtchn(int port
)
383 struct shared_info
*s
= HYPERVISOR_shared_info
;
384 unsigned int cpu
= get_cpu();
385 int do_hypercall
= 0, evtchn_pending
= 0;
387 BUG_ON(!irqs_disabled());
389 if (unlikely((cpu
!= cpu_from_evtchn(port
))))
392 evtchn_pending
= sync_test_bit(port
, &s
->evtchn_pending
[0]);
394 if (unlikely(evtchn_pending
&& xen_hvm_domain()))
397 /* Slow path (hypercall) if this is a non-local port or if this is
398 * an hvm domain and an event is pending (hvm domains don't have
399 * their own implementation of irq_enable). */
401 struct evtchn_unmask unmask
= { .port
= port
};
402 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask
, &unmask
);
404 struct vcpu_info
*vcpu_info
= __this_cpu_read(xen_vcpu
);
406 sync_clear_bit(port
, &s
->evtchn_mask
[0]);
409 * The following is basically the equivalent of
410 * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
411 * the interrupt edge' if the channel is masked.
413 if (evtchn_pending
&&
414 !sync_test_and_set_bit(port
/ BITS_PER_LONG
,
415 &vcpu_info
->evtchn_pending_sel
))
416 vcpu_info
->evtchn_upcall_pending
= 1;
422 static void xen_irq_init(unsigned irq
)
424 struct irq_info
*info
;
426 struct irq_desc
*desc
= irq_to_desc(irq
);
428 /* By default all event channels notify CPU#0. */
429 cpumask_copy(desc
->irq_data
.affinity
, cpumask_of(0));
432 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
434 panic("Unable to allocate metadata for IRQ%d\n", irq
);
436 info
->type
= IRQT_UNBOUND
;
439 irq_set_handler_data(irq
, info
);
441 list_add_tail(&info
->list
, &xen_irq_list_head
);
444 static int __must_check
xen_allocate_irq_dynamic(void)
449 #ifdef CONFIG_X86_IO_APIC
451 * For an HVM guest or domain 0 which see "real" (emulated or
452 * actual respectively) GSIs we allocate dynamic IRQs
453 * e.g. those corresponding to event channels or MSIs
454 * etc. from the range above those "real" GSIs to avoid
457 if (xen_initial_domain() || xen_hvm_domain())
458 first
= get_nr_irqs_gsi();
461 irq
= irq_alloc_desc_from(first
, -1);
469 static int __must_check
xen_allocate_irq_gsi(unsigned gsi
)
474 * A PV guest has no concept of a GSI (since it has no ACPI
475 * nor access to/knowledge of the physical APICs). Therefore
476 * all IRQs are dynamically allocated from the entire IRQ
479 if (xen_pv_domain() && !xen_initial_domain())
480 return xen_allocate_irq_dynamic();
482 /* Legacy IRQ descriptors are already allocated by the arch. */
483 if (gsi
< NR_IRQS_LEGACY
)
486 irq
= irq_alloc_desc_at(gsi
, -1);
493 static void xen_free_irq(unsigned irq
)
495 struct irq_info
*info
= irq_get_handler_data(irq
);
497 list_del(&info
->list
);
499 irq_set_handler_data(irq
, NULL
);
501 WARN_ON(info
->refcnt
> 0);
505 /* Legacy IRQ descriptors are managed by the arch. */
506 if (irq
< NR_IRQS_LEGACY
)
512 static void pirq_query_unmask(int irq
)
514 struct physdev_irq_status_query irq_status
;
515 struct irq_info
*info
= info_for_irq(irq
);
517 BUG_ON(info
->type
!= IRQT_PIRQ
);
519 irq_status
.irq
= pirq_from_irq(irq
);
520 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query
, &irq_status
))
521 irq_status
.flags
= 0;
523 info
->u
.pirq
.flags
&= ~PIRQ_NEEDS_EOI
;
524 if (irq_status
.flags
& XENIRQSTAT_needs_eoi
)
525 info
->u
.pirq
.flags
|= PIRQ_NEEDS_EOI
;
528 static bool probing_irq(int irq
)
530 struct irq_desc
*desc
= irq_to_desc(irq
);
532 return desc
&& desc
->action
== NULL
;
535 static void eoi_pirq(struct irq_data
*data
)
537 int evtchn
= evtchn_from_irq(data
->irq
);
538 struct physdev_eoi eoi
= { .irq
= pirq_from_irq(data
->irq
) };
543 if (VALID_EVTCHN(evtchn
))
544 clear_evtchn(evtchn
);
546 if (pirq_needs_eoi(data
->irq
)) {
547 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_eoi
, &eoi
);
552 static void mask_ack_pirq(struct irq_data
*data
)
554 disable_dynirq(data
);
558 static unsigned int __startup_pirq(unsigned int irq
)
560 struct evtchn_bind_pirq bind_pirq
;
561 struct irq_info
*info
= info_for_irq(irq
);
562 int evtchn
= evtchn_from_irq(irq
);
565 BUG_ON(info
->type
!= IRQT_PIRQ
);
567 if (VALID_EVTCHN(evtchn
))
570 bind_pirq
.pirq
= pirq_from_irq(irq
);
571 /* NB. We are happy to share unless we are probing. */
572 bind_pirq
.flags
= info
->u
.pirq
.flags
& PIRQ_SHAREABLE
?
573 BIND_PIRQ__WILL_SHARE
: 0;
574 rc
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq
, &bind_pirq
);
576 if (!probing_irq(irq
))
577 printk(KERN_INFO
"Failed to obtain physical IRQ %d\n",
581 evtchn
= bind_pirq
.port
;
583 pirq_query_unmask(irq
);
585 evtchn_to_irq
[evtchn
] = irq
;
586 bind_evtchn_to_cpu(evtchn
, 0);
587 info
->evtchn
= evtchn
;
590 unmask_evtchn(evtchn
);
591 eoi_pirq(irq_get_irq_data(irq
));
596 static unsigned int startup_pirq(struct irq_data
*data
)
598 return __startup_pirq(data
->irq
);
601 static void shutdown_pirq(struct irq_data
*data
)
603 struct evtchn_close close
;
604 unsigned int irq
= data
->irq
;
605 struct irq_info
*info
= info_for_irq(irq
);
606 int evtchn
= evtchn_from_irq(irq
);
608 BUG_ON(info
->type
!= IRQT_PIRQ
);
610 if (!VALID_EVTCHN(evtchn
))
616 if (HYPERVISOR_event_channel_op(EVTCHNOP_close
, &close
) != 0)
619 bind_evtchn_to_cpu(evtchn
, 0);
620 evtchn_to_irq
[evtchn
] = -1;
624 static void enable_pirq(struct irq_data
*data
)
629 static void disable_pirq(struct irq_data
*data
)
631 disable_dynirq(data
);
634 int xen_irq_from_gsi(unsigned gsi
)
636 struct irq_info
*info
;
638 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
639 if (info
->type
!= IRQT_PIRQ
)
642 if (info
->u
.pirq
.gsi
== gsi
)
648 EXPORT_SYMBOL_GPL(xen_irq_from_gsi
);
651 * Do not make any assumptions regarding the relationship between the
652 * IRQ number returned here and the Xen pirq argument.
654 * Note: We don't assign an event channel until the irq actually started
655 * up. Return an existing irq if we've already got one for the gsi.
657 * Shareable implies level triggered, not shareable implies edge
660 int xen_bind_pirq_gsi_to_irq(unsigned gsi
,
661 unsigned pirq
, int shareable
, char *name
)
664 struct physdev_irq irq_op
;
666 mutex_lock(&irq_mapping_update_lock
);
668 irq
= xen_irq_from_gsi(gsi
);
670 printk(KERN_INFO
"xen_map_pirq_gsi: returning irq %d for gsi %u\n",
675 irq
= xen_allocate_irq_gsi(gsi
);
682 /* Only the privileged domain can do this. For non-priv, the pcifront
683 * driver provides a PCI bus that does the call to do exactly
684 * this in the priv domain. */
685 if (xen_initial_domain() &&
686 HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector
, &irq_op
)) {
692 xen_irq_info_pirq_init(irq
, 0, pirq
, gsi
, irq_op
.vector
, DOMID_SELF
,
693 shareable
? PIRQ_SHAREABLE
: 0);
695 pirq_query_unmask(irq
);
696 /* We try to use the handler with the appropriate semantic for the
697 * type of interrupt: if the interrupt is an edge triggered
698 * interrupt we use handle_edge_irq.
700 * On the other hand if the interrupt is level triggered we use
701 * handle_fasteoi_irq like the native code does for this kind of
704 * Depending on the Xen version, pirq_needs_eoi might return true
705 * not only for level triggered interrupts but for edge triggered
706 * interrupts too. In any case Xen always honors the eoi mechanism,
707 * not injecting any more pirqs of the same kind if the first one
708 * hasn't received an eoi yet. Therefore using the fasteoi handler
709 * is the right choice either way.
712 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
,
713 handle_fasteoi_irq
, name
);
715 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
,
716 handle_edge_irq
, name
);
719 mutex_unlock(&irq_mapping_update_lock
);
724 #ifdef CONFIG_PCI_MSI
725 int xen_allocate_pirq_msi(struct pci_dev
*dev
, struct msi_desc
*msidesc
)
728 struct physdev_get_free_pirq op_get_free_pirq
;
730 op_get_free_pirq
.type
= MAP_PIRQ_TYPE_MSI
;
731 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq
, &op_get_free_pirq
);
733 WARN_ONCE(rc
== -ENOSYS
,
734 "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
736 return rc
? -1 : op_get_free_pirq
.pirq
;
739 int xen_bind_pirq_msi_to_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
,
740 int pirq
, int vector
, const char *name
,
745 mutex_lock(&irq_mapping_update_lock
);
747 irq
= xen_allocate_irq_dynamic();
751 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
, handle_edge_irq
,
754 xen_irq_info_pirq_init(irq
, 0, pirq
, 0, vector
, domid
, 0);
755 ret
= irq_set_msi_desc(irq
, msidesc
);
759 mutex_unlock(&irq_mapping_update_lock
);
762 mutex_unlock(&irq_mapping_update_lock
);
768 int xen_destroy_irq(int irq
)
770 struct irq_desc
*desc
;
771 struct physdev_unmap_pirq unmap_irq
;
772 struct irq_info
*info
= info_for_irq(irq
);
775 mutex_lock(&irq_mapping_update_lock
);
777 desc
= irq_to_desc(irq
);
781 if (xen_initial_domain()) {
782 unmap_irq
.pirq
= info
->u
.pirq
.pirq
;
783 unmap_irq
.domid
= info
->u
.pirq
.domid
;
784 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq
, &unmap_irq
);
785 /* If another domain quits without making the pci_disable_msix
786 * call, the Xen hypervisor takes care of freeing the PIRQs
787 * (free_domain_pirqs).
789 if ((rc
== -ESRCH
&& info
->u
.pirq
.domid
!= DOMID_SELF
))
790 printk(KERN_INFO
"domain %d does not have %d anymore\n",
791 info
->u
.pirq
.domid
, info
->u
.pirq
.pirq
);
793 printk(KERN_WARNING
"unmap irq failed %d\n", rc
);
801 mutex_unlock(&irq_mapping_update_lock
);
805 int xen_irq_from_pirq(unsigned pirq
)
809 struct irq_info
*info
;
811 mutex_lock(&irq_mapping_update_lock
);
813 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
814 if (info
->type
!= IRQT_PIRQ
)
817 if (info
->u
.pirq
.pirq
== pirq
)
822 mutex_unlock(&irq_mapping_update_lock
);
828 int xen_pirq_from_irq(unsigned irq
)
830 return pirq_from_irq(irq
);
832 EXPORT_SYMBOL_GPL(xen_pirq_from_irq
);
833 int bind_evtchn_to_irq(unsigned int evtchn
)
837 mutex_lock(&irq_mapping_update_lock
);
839 irq
= evtchn_to_irq
[evtchn
];
842 irq
= xen_allocate_irq_dynamic();
846 irq_set_chip_and_handler_name(irq
, &xen_dynamic_chip
,
847 handle_edge_irq
, "event");
849 xen_irq_info_evtchn_init(irq
, evtchn
);
851 struct irq_info
*info
= info_for_irq(irq
);
852 WARN_ON(info
== NULL
|| info
->type
!= IRQT_EVTCHN
);
854 irq_clear_status_flags(irq
, IRQ_NOREQUEST
|IRQ_NOAUTOEN
);
857 mutex_unlock(&irq_mapping_update_lock
);
861 EXPORT_SYMBOL_GPL(bind_evtchn_to_irq
);
863 static int bind_ipi_to_irq(unsigned int ipi
, unsigned int cpu
)
865 struct evtchn_bind_ipi bind_ipi
;
868 mutex_lock(&irq_mapping_update_lock
);
870 irq
= per_cpu(ipi_to_irq
, cpu
)[ipi
];
873 irq
= xen_allocate_irq_dynamic();
877 irq_set_chip_and_handler_name(irq
, &xen_percpu_chip
,
878 handle_percpu_irq
, "ipi");
881 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi
,
884 evtchn
= bind_ipi
.port
;
886 xen_irq_info_ipi_init(cpu
, irq
, evtchn
, ipi
);
888 bind_evtchn_to_cpu(evtchn
, cpu
);
890 struct irq_info
*info
= info_for_irq(irq
);
891 WARN_ON(info
== NULL
|| info
->type
!= IRQT_IPI
);
895 mutex_unlock(&irq_mapping_update_lock
);
899 static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain
,
900 unsigned int remote_port
)
902 struct evtchn_bind_interdomain bind_interdomain
;
905 bind_interdomain
.remote_dom
= remote_domain
;
906 bind_interdomain
.remote_port
= remote_port
;
908 err
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain
,
911 return err
? : bind_evtchn_to_irq(bind_interdomain
.local_port
);
914 static int find_virq(unsigned int virq
, unsigned int cpu
)
916 struct evtchn_status status
;
917 int port
, rc
= -ENOENT
;
919 memset(&status
, 0, sizeof(status
));
920 for (port
= 0; port
<= NR_EVENT_CHANNELS
; port
++) {
921 status
.dom
= DOMID_SELF
;
923 rc
= HYPERVISOR_event_channel_op(EVTCHNOP_status
, &status
);
926 if (status
.status
!= EVTCHNSTAT_virq
)
928 if (status
.u
.virq
== virq
&& status
.vcpu
== cpu
) {
936 int bind_virq_to_irq(unsigned int virq
, unsigned int cpu
)
938 struct evtchn_bind_virq bind_virq
;
939 int evtchn
, irq
, ret
;
941 mutex_lock(&irq_mapping_update_lock
);
943 irq
= per_cpu(virq_to_irq
, cpu
)[virq
];
946 irq
= xen_allocate_irq_dynamic();
950 irq_set_chip_and_handler_name(irq
, &xen_percpu_chip
,
951 handle_percpu_irq
, "virq");
953 bind_virq
.virq
= virq
;
954 bind_virq
.vcpu
= cpu
;
955 ret
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq
,
958 evtchn
= bind_virq
.port
;
961 ret
= find_virq(virq
, cpu
);
966 xen_irq_info_virq_init(cpu
, irq
, evtchn
, virq
);
968 bind_evtchn_to_cpu(evtchn
, cpu
);
970 struct irq_info
*info
= info_for_irq(irq
);
971 WARN_ON(info
== NULL
|| info
->type
!= IRQT_VIRQ
);
975 mutex_unlock(&irq_mapping_update_lock
);
980 static void unbind_from_irq(unsigned int irq
)
982 struct evtchn_close close
;
983 int evtchn
= evtchn_from_irq(irq
);
984 struct irq_info
*info
= irq_get_handler_data(irq
);
986 mutex_lock(&irq_mapping_update_lock
);
988 if (info
->refcnt
> 0) {
990 if (info
->refcnt
!= 0)
994 if (VALID_EVTCHN(evtchn
)) {
996 if (HYPERVISOR_event_channel_op(EVTCHNOP_close
, &close
) != 0)
999 switch (type_from_irq(irq
)) {
1001 per_cpu(virq_to_irq
, cpu_from_evtchn(evtchn
))
1002 [virq_from_irq(irq
)] = -1;
1005 per_cpu(ipi_to_irq
, cpu_from_evtchn(evtchn
))
1006 [ipi_from_irq(irq
)] = -1;
1012 /* Closed ports are implicitly re-bound to VCPU0. */
1013 bind_evtchn_to_cpu(evtchn
, 0);
1015 evtchn_to_irq
[evtchn
] = -1;
1018 BUG_ON(info_for_irq(irq
)->type
== IRQT_UNBOUND
);
1023 mutex_unlock(&irq_mapping_update_lock
);
1026 int bind_evtchn_to_irqhandler(unsigned int evtchn
,
1027 irq_handler_t handler
,
1028 unsigned long irqflags
,
1029 const char *devname
, void *dev_id
)
1033 irq
= bind_evtchn_to_irq(evtchn
);
1036 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1038 unbind_from_irq(irq
);
1044 EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler
);
1046 int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain
,
1047 unsigned int remote_port
,
1048 irq_handler_t handler
,
1049 unsigned long irqflags
,
1050 const char *devname
,
1055 irq
= bind_interdomain_evtchn_to_irq(remote_domain
, remote_port
);
1059 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1061 unbind_from_irq(irq
);
1067 EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler
);
1069 int bind_virq_to_irqhandler(unsigned int virq
, unsigned int cpu
,
1070 irq_handler_t handler
,
1071 unsigned long irqflags
, const char *devname
, void *dev_id
)
1075 irq
= bind_virq_to_irq(virq
, cpu
);
1078 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1080 unbind_from_irq(irq
);
1086 EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler
);
1088 int bind_ipi_to_irqhandler(enum ipi_vector ipi
,
1090 irq_handler_t handler
,
1091 unsigned long irqflags
,
1092 const char *devname
,
1097 irq
= bind_ipi_to_irq(ipi
, cpu
);
1101 irqflags
|= IRQF_NO_SUSPEND
| IRQF_FORCE_RESUME
| IRQF_EARLY_RESUME
;
1102 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1104 unbind_from_irq(irq
);
1111 void unbind_from_irqhandler(unsigned int irq
, void *dev_id
)
1113 free_irq(irq
, dev_id
);
1114 unbind_from_irq(irq
);
1116 EXPORT_SYMBOL_GPL(unbind_from_irqhandler
);
1118 int evtchn_make_refcounted(unsigned int evtchn
)
1120 int irq
= evtchn_to_irq
[evtchn
];
1121 struct irq_info
*info
;
1126 info
= irq_get_handler_data(irq
);
1131 WARN_ON(info
->refcnt
!= -1);
1137 EXPORT_SYMBOL_GPL(evtchn_make_refcounted
);
1139 int evtchn_get(unsigned int evtchn
)
1142 struct irq_info
*info
;
1145 if (evtchn
>= NR_EVENT_CHANNELS
)
1148 mutex_lock(&irq_mapping_update_lock
);
1150 irq
= evtchn_to_irq
[evtchn
];
1154 info
= irq_get_handler_data(irq
);
1160 if (info
->refcnt
<= 0)
1166 mutex_unlock(&irq_mapping_update_lock
);
1170 EXPORT_SYMBOL_GPL(evtchn_get
);
1172 void evtchn_put(unsigned int evtchn
)
1174 int irq
= evtchn_to_irq
[evtchn
];
1175 if (WARN_ON(irq
== -1))
1177 unbind_from_irq(irq
);
1179 EXPORT_SYMBOL_GPL(evtchn_put
);
1181 void xen_send_IPI_one(unsigned int cpu
, enum ipi_vector vector
)
1183 int irq
= per_cpu(ipi_to_irq
, cpu
)[vector
];
1185 notify_remote_via_irq(irq
);
1188 irqreturn_t
xen_debug_interrupt(int irq
, void *dev_id
)
1190 struct shared_info
*sh
= HYPERVISOR_shared_info
;
1191 int cpu
= smp_processor_id();
1192 unsigned long *cpu_evtchn
= per_cpu(cpu_evtchn_mask
, cpu
);
1194 unsigned long flags
;
1195 static DEFINE_SPINLOCK(debug_lock
);
1196 struct vcpu_info
*v
;
1198 spin_lock_irqsave(&debug_lock
, flags
);
1200 printk("\nvcpu %d\n ", cpu
);
1202 for_each_online_cpu(i
) {
1204 v
= per_cpu(xen_vcpu
, i
);
1205 pending
= (get_irq_regs() && i
== cpu
)
1206 ? xen_irqs_disabled(get_irq_regs())
1207 : v
->evtchn_upcall_mask
;
1208 printk("%d: masked=%d pending=%d event_sel %0*lx\n ", i
,
1209 pending
, v
->evtchn_upcall_pending
,
1210 (int)(sizeof(v
->evtchn_pending_sel
)*2),
1211 v
->evtchn_pending_sel
);
1213 v
= per_cpu(xen_vcpu
, cpu
);
1215 printk("\npending:\n ");
1216 for (i
= ARRAY_SIZE(sh
->evtchn_pending
)-1; i
>= 0; i
--)
1217 printk("%0*lx%s", (int)sizeof(sh
->evtchn_pending
[0])*2,
1218 sh
->evtchn_pending
[i
],
1219 i
% 8 == 0 ? "\n " : " ");
1220 printk("\nglobal mask:\n ");
1221 for (i
= ARRAY_SIZE(sh
->evtchn_mask
)-1; i
>= 0; i
--)
1223 (int)(sizeof(sh
->evtchn_mask
[0])*2),
1225 i
% 8 == 0 ? "\n " : " ");
1227 printk("\nglobally unmasked:\n ");
1228 for (i
= ARRAY_SIZE(sh
->evtchn_mask
)-1; i
>= 0; i
--)
1229 printk("%0*lx%s", (int)(sizeof(sh
->evtchn_mask
[0])*2),
1230 sh
->evtchn_pending
[i
] & ~sh
->evtchn_mask
[i
],
1231 i
% 8 == 0 ? "\n " : " ");
1233 printk("\nlocal cpu%d mask:\n ", cpu
);
1234 for (i
= (NR_EVENT_CHANNELS
/BITS_PER_LONG
)-1; i
>= 0; i
--)
1235 printk("%0*lx%s", (int)(sizeof(cpu_evtchn
[0])*2),
1237 i
% 8 == 0 ? "\n " : " ");
1239 printk("\nlocally unmasked:\n ");
1240 for (i
= ARRAY_SIZE(sh
->evtchn_mask
)-1; i
>= 0; i
--) {
1241 unsigned long pending
= sh
->evtchn_pending
[i
]
1242 & ~sh
->evtchn_mask
[i
]
1244 printk("%0*lx%s", (int)(sizeof(sh
->evtchn_mask
[0])*2),
1245 pending
, i
% 8 == 0 ? "\n " : " ");
1248 printk("\npending list:\n");
1249 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++) {
1250 if (sync_test_bit(i
, sh
->evtchn_pending
)) {
1251 int word_idx
= i
/ BITS_PER_LONG
;
1252 printk(" %d: event %d -> irq %d%s%s%s\n",
1253 cpu_from_evtchn(i
), i
,
1255 sync_test_bit(word_idx
, &v
->evtchn_pending_sel
)
1257 !sync_test_bit(i
, sh
->evtchn_mask
)
1258 ? "" : " globally-masked",
1259 sync_test_bit(i
, cpu_evtchn
)
1260 ? "" : " locally-masked");
1264 spin_unlock_irqrestore(&debug_lock
, flags
);
1269 static DEFINE_PER_CPU(unsigned, xed_nesting_count
);
1270 static DEFINE_PER_CPU(unsigned int, current_word_idx
);
1271 static DEFINE_PER_CPU(unsigned int, current_bit_idx
);
1274 * Mask out the i least significant bits of w
1276 #define MASK_LSBS(w, i) (w & ((~0UL) << i))
1279 * Search the CPUs pending events bitmasks. For each one found, map
1280 * the event number to an irq, and feed it into do_IRQ() for
1283 * Xen uses a two-level bitmap to speed searching. The first level is
1284 * a bitset of words which contain pending event bits. The second
1285 * level is a bitset of pending events themselves.
1287 static void __xen_evtchn_do_upcall(void)
1289 int start_word_idx
, start_bit_idx
;
1290 int word_idx
, bit_idx
;
1292 int cpu
= get_cpu();
1293 struct shared_info
*s
= HYPERVISOR_shared_info
;
1294 struct vcpu_info
*vcpu_info
= __this_cpu_read(xen_vcpu
);
1298 unsigned long pending_words
;
1300 vcpu_info
->evtchn_upcall_pending
= 0;
1302 if (__this_cpu_inc_return(xed_nesting_count
) - 1)
1305 #ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
1306 /* Clear master flag /before/ clearing selector flag. */
1309 pending_words
= xchg(&vcpu_info
->evtchn_pending_sel
, 0);
1311 start_word_idx
= __this_cpu_read(current_word_idx
);
1312 start_bit_idx
= __this_cpu_read(current_bit_idx
);
1314 word_idx
= start_word_idx
;
1316 for (i
= 0; pending_words
!= 0; i
++) {
1317 unsigned long pending_bits
;
1318 unsigned long words
;
1320 words
= MASK_LSBS(pending_words
, word_idx
);
1323 * If we masked out all events, wrap to beginning.
1330 word_idx
= __ffs(words
);
1332 pending_bits
= active_evtchns(cpu
, s
, word_idx
);
1333 bit_idx
= 0; /* usually scan entire word from start */
1334 if (word_idx
== start_word_idx
) {
1335 /* We scan the starting word in two parts */
1337 /* 1st time: start in the middle */
1338 bit_idx
= start_bit_idx
;
1340 /* 2nd time: mask bits done already */
1341 bit_idx
&= (1UL << start_bit_idx
) - 1;
1347 struct irq_desc
*desc
;
1349 bits
= MASK_LSBS(pending_bits
, bit_idx
);
1351 /* If we masked out all events, move on. */
1355 bit_idx
= __ffs(bits
);
1358 port
= (word_idx
* BITS_PER_LONG
) + bit_idx
;
1359 irq
= evtchn_to_irq
[port
];
1362 desc
= irq_to_desc(irq
);
1364 generic_handle_irq_desc(irq
, desc
);
1367 bit_idx
= (bit_idx
+ 1) % BITS_PER_LONG
;
1369 /* Next caller starts at last processed + 1 */
1370 __this_cpu_write(current_word_idx
,
1371 bit_idx
? word_idx
:
1372 (word_idx
+1) % BITS_PER_LONG
);
1373 __this_cpu_write(current_bit_idx
, bit_idx
);
1374 } while (bit_idx
!= 0);
1376 /* Scan start_l1i twice; all others once. */
1377 if ((word_idx
!= start_word_idx
) || (i
!= 0))
1378 pending_words
&= ~(1UL << word_idx
);
1380 word_idx
= (word_idx
+ 1) % BITS_PER_LONG
;
1383 BUG_ON(!irqs_disabled());
1385 count
= __this_cpu_read(xed_nesting_count
);
1386 __this_cpu_write(xed_nesting_count
, 0);
1387 } while (count
!= 1 || vcpu_info
->evtchn_upcall_pending
);
1394 void xen_evtchn_do_upcall(struct pt_regs
*regs
)
1396 struct pt_regs
*old_regs
= set_irq_regs(regs
);
1403 __xen_evtchn_do_upcall();
1406 set_irq_regs(old_regs
);
1409 void xen_hvm_evtchn_do_upcall(void)
1411 __xen_evtchn_do_upcall();
1413 EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall
);
1415 /* Rebind a new event channel to an existing irq. */
1416 void rebind_evtchn_irq(int evtchn
, int irq
)
1418 struct irq_info
*info
= info_for_irq(irq
);
1420 /* Make sure the irq is masked, since the new event channel
1421 will also be masked. */
1424 mutex_lock(&irq_mapping_update_lock
);
1426 /* After resume the irq<->evtchn mappings are all cleared out */
1427 BUG_ON(evtchn_to_irq
[evtchn
] != -1);
1428 /* Expect irq to have been bound before,
1429 so there should be a proper type */
1430 BUG_ON(info
->type
== IRQT_UNBOUND
);
1432 xen_irq_info_evtchn_init(irq
, evtchn
);
1434 mutex_unlock(&irq_mapping_update_lock
);
1436 /* new event channels are always bound to cpu 0 */
1437 irq_set_affinity(irq
, cpumask_of(0));
1439 /* Unmask the event channel. */
1443 /* Rebind an evtchn so that it gets delivered to a specific cpu */
1444 static int rebind_irq_to_cpu(unsigned irq
, unsigned tcpu
)
1446 struct evtchn_bind_vcpu bind_vcpu
;
1447 int evtchn
= evtchn_from_irq(irq
);
1449 if (!VALID_EVTCHN(evtchn
))
1453 * Events delivered via platform PCI interrupts are always
1454 * routed to vcpu 0 and hence cannot be rebound.
1456 if (xen_hvm_domain() && !xen_have_vector_callback
)
1459 /* Send future instances of this interrupt to other vcpu. */
1460 bind_vcpu
.port
= evtchn
;
1461 bind_vcpu
.vcpu
= tcpu
;
1464 * If this fails, it usually just indicates that we're dealing with a
1465 * virq or IPI channel, which don't actually need to be rebound. Ignore
1466 * it, but don't do the xenlinux-level rebind in that case.
1468 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu
, &bind_vcpu
) >= 0)
1469 bind_evtchn_to_cpu(evtchn
, tcpu
);
1474 static int set_affinity_irq(struct irq_data
*data
, const struct cpumask
*dest
,
1477 unsigned tcpu
= cpumask_first(dest
);
1479 return rebind_irq_to_cpu(data
->irq
, tcpu
);
1482 int resend_irq_on_evtchn(unsigned int irq
)
1484 int masked
, evtchn
= evtchn_from_irq(irq
);
1485 struct shared_info
*s
= HYPERVISOR_shared_info
;
1487 if (!VALID_EVTCHN(evtchn
))
1490 masked
= sync_test_and_set_bit(evtchn
, s
->evtchn_mask
);
1491 sync_set_bit(evtchn
, s
->evtchn_pending
);
1493 unmask_evtchn(evtchn
);
1498 static void enable_dynirq(struct irq_data
*data
)
1500 int evtchn
= evtchn_from_irq(data
->irq
);
1502 if (VALID_EVTCHN(evtchn
))
1503 unmask_evtchn(evtchn
);
1506 static void disable_dynirq(struct irq_data
*data
)
1508 int evtchn
= evtchn_from_irq(data
->irq
);
1510 if (VALID_EVTCHN(evtchn
))
1511 mask_evtchn(evtchn
);
1514 static void ack_dynirq(struct irq_data
*data
)
1516 int evtchn
= evtchn_from_irq(data
->irq
);
1520 if (VALID_EVTCHN(evtchn
))
1521 clear_evtchn(evtchn
);
1524 static void mask_ack_dynirq(struct irq_data
*data
)
1526 disable_dynirq(data
);
1530 static int retrigger_dynirq(struct irq_data
*data
)
1532 int evtchn
= evtchn_from_irq(data
->irq
);
1533 struct shared_info
*sh
= HYPERVISOR_shared_info
;
1536 if (VALID_EVTCHN(evtchn
)) {
1539 masked
= sync_test_and_set_bit(evtchn
, sh
->evtchn_mask
);
1540 sync_set_bit(evtchn
, sh
->evtchn_pending
);
1542 unmask_evtchn(evtchn
);
1549 static void restore_pirqs(void)
1551 int pirq
, rc
, irq
, gsi
;
1552 struct physdev_map_pirq map_irq
;
1553 struct irq_info
*info
;
1555 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
1556 if (info
->type
!= IRQT_PIRQ
)
1559 pirq
= info
->u
.pirq
.pirq
;
1560 gsi
= info
->u
.pirq
.gsi
;
1563 /* save/restore of PT devices doesn't work, so at this point the
1564 * only devices present are GSI based emulated devices */
1568 map_irq
.domid
= DOMID_SELF
;
1569 map_irq
.type
= MAP_PIRQ_TYPE_GSI
;
1570 map_irq
.index
= gsi
;
1571 map_irq
.pirq
= pirq
;
1573 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq
, &map_irq
);
1575 printk(KERN_WARNING
"xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
1576 gsi
, irq
, pirq
, rc
);
1581 printk(KERN_DEBUG
"xen: --> irq=%d, pirq=%d\n", irq
, map_irq
.pirq
);
1583 __startup_pirq(irq
);
1587 static void restore_cpu_virqs(unsigned int cpu
)
1589 struct evtchn_bind_virq bind_virq
;
1590 int virq
, irq
, evtchn
;
1592 for (virq
= 0; virq
< NR_VIRQS
; virq
++) {
1593 if ((irq
= per_cpu(virq_to_irq
, cpu
)[virq
]) == -1)
1596 BUG_ON(virq_from_irq(irq
) != virq
);
1598 /* Get a new binding from Xen. */
1599 bind_virq
.virq
= virq
;
1600 bind_virq
.vcpu
= cpu
;
1601 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq
,
1604 evtchn
= bind_virq
.port
;
1606 /* Record the new mapping. */
1607 xen_irq_info_virq_init(cpu
, irq
, evtchn
, virq
);
1608 bind_evtchn_to_cpu(evtchn
, cpu
);
1612 static void restore_cpu_ipis(unsigned int cpu
)
1614 struct evtchn_bind_ipi bind_ipi
;
1615 int ipi
, irq
, evtchn
;
1617 for (ipi
= 0; ipi
< XEN_NR_IPIS
; ipi
++) {
1618 if ((irq
= per_cpu(ipi_to_irq
, cpu
)[ipi
]) == -1)
1621 BUG_ON(ipi_from_irq(irq
) != ipi
);
1623 /* Get a new binding from Xen. */
1624 bind_ipi
.vcpu
= cpu
;
1625 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi
,
1628 evtchn
= bind_ipi
.port
;
1630 /* Record the new mapping. */
1631 xen_irq_info_ipi_init(cpu
, irq
, evtchn
, ipi
);
1632 bind_evtchn_to_cpu(evtchn
, cpu
);
1636 /* Clear an irq's pending state, in preparation for polling on it */
1637 void xen_clear_irq_pending(int irq
)
1639 int evtchn
= evtchn_from_irq(irq
);
1641 if (VALID_EVTCHN(evtchn
))
1642 clear_evtchn(evtchn
);
1644 EXPORT_SYMBOL(xen_clear_irq_pending
);
1645 void xen_set_irq_pending(int irq
)
1647 int evtchn
= evtchn_from_irq(irq
);
1649 if (VALID_EVTCHN(evtchn
))
1653 bool xen_test_irq_pending(int irq
)
1655 int evtchn
= evtchn_from_irq(irq
);
1658 if (VALID_EVTCHN(evtchn
))
1659 ret
= test_evtchn(evtchn
);
1664 /* Poll waiting for an irq to become pending with timeout. In the usual case,
1665 * the irq will be disabled so it won't deliver an interrupt. */
1666 void xen_poll_irq_timeout(int irq
, u64 timeout
)
1668 evtchn_port_t evtchn
= evtchn_from_irq(irq
);
1670 if (VALID_EVTCHN(evtchn
)) {
1671 struct sched_poll poll
;
1674 poll
.timeout
= timeout
;
1675 set_xen_guest_handle(poll
.ports
, &evtchn
);
1677 if (HYPERVISOR_sched_op(SCHEDOP_poll
, &poll
) != 0)
1681 EXPORT_SYMBOL(xen_poll_irq_timeout
);
1682 /* Poll waiting for an irq to become pending. In the usual case, the
1683 * irq will be disabled so it won't deliver an interrupt. */
1684 void xen_poll_irq(int irq
)
1686 xen_poll_irq_timeout(irq
, 0 /* no timeout */);
1689 /* Check whether the IRQ line is shared with other guests. */
1690 int xen_test_irq_shared(int irq
)
1692 struct irq_info
*info
= info_for_irq(irq
);
1693 struct physdev_irq_status_query irq_status
= { .irq
= info
->u
.pirq
.pirq
};
1695 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query
, &irq_status
))
1697 return !(irq_status
.flags
& XENIRQSTAT_shared
);
1699 EXPORT_SYMBOL_GPL(xen_test_irq_shared
);
1701 void xen_irq_resume(void)
1703 unsigned int cpu
, evtchn
;
1704 struct irq_info
*info
;
1706 init_evtchn_cpu_bindings();
1708 /* New event-channel space is not 'live' yet. */
1709 for (evtchn
= 0; evtchn
< NR_EVENT_CHANNELS
; evtchn
++)
1710 mask_evtchn(evtchn
);
1712 /* No IRQ <-> event-channel mappings. */
1713 list_for_each_entry(info
, &xen_irq_list_head
, list
)
1714 info
->evtchn
= 0; /* zap event-channel binding */
1716 for (evtchn
= 0; evtchn
< NR_EVENT_CHANNELS
; evtchn
++)
1717 evtchn_to_irq
[evtchn
] = -1;
1719 for_each_possible_cpu(cpu
) {
1720 restore_cpu_virqs(cpu
);
1721 restore_cpu_ipis(cpu
);
1727 static struct irq_chip xen_dynamic_chip __read_mostly
= {
1730 .irq_disable
= disable_dynirq
,
1731 .irq_mask
= disable_dynirq
,
1732 .irq_unmask
= enable_dynirq
,
1734 .irq_ack
= ack_dynirq
,
1735 .irq_mask_ack
= mask_ack_dynirq
,
1737 .irq_set_affinity
= set_affinity_irq
,
1738 .irq_retrigger
= retrigger_dynirq
,
1741 static struct irq_chip xen_pirq_chip __read_mostly
= {
1744 .irq_startup
= startup_pirq
,
1745 .irq_shutdown
= shutdown_pirq
,
1746 .irq_enable
= enable_pirq
,
1747 .irq_disable
= disable_pirq
,
1749 .irq_mask
= disable_dynirq
,
1750 .irq_unmask
= enable_dynirq
,
1752 .irq_ack
= eoi_pirq
,
1753 .irq_eoi
= eoi_pirq
,
1754 .irq_mask_ack
= mask_ack_pirq
,
1756 .irq_set_affinity
= set_affinity_irq
,
1758 .irq_retrigger
= retrigger_dynirq
,
1761 static struct irq_chip xen_percpu_chip __read_mostly
= {
1762 .name
= "xen-percpu",
1764 .irq_disable
= disable_dynirq
,
1765 .irq_mask
= disable_dynirq
,
1766 .irq_unmask
= enable_dynirq
,
1768 .irq_ack
= ack_dynirq
,
1771 int xen_set_callback_via(uint64_t via
)
1773 struct xen_hvm_param a
;
1774 a
.domid
= DOMID_SELF
;
1775 a
.index
= HVM_PARAM_CALLBACK_IRQ
;
1777 return HYPERVISOR_hvm_op(HVMOP_set_param
, &a
);
1779 EXPORT_SYMBOL_GPL(xen_set_callback_via
);
1781 #ifdef CONFIG_XEN_PVHVM
1782 /* Vector callbacks are better than PCI interrupts to receive event
1783 * channel notifications because we can receive vector callbacks on any
1784 * vcpu and we don't need PCI support or APIC interactions. */
1785 void xen_callback_vector(void)
1788 uint64_t callback_via
;
1789 if (xen_have_vector_callback
) {
1790 callback_via
= HVM_CALLBACK_VECTOR(XEN_HVM_EVTCHN_CALLBACK
);
1791 rc
= xen_set_callback_via(callback_via
);
1793 printk(KERN_ERR
"Request for Xen HVM callback vector"
1795 xen_have_vector_callback
= 0;
1798 printk(KERN_INFO
"Xen HVM callback vector for event delivery is "
1800 /* in the restore case the vector has already been allocated */
1801 if (!test_bit(XEN_HVM_EVTCHN_CALLBACK
, used_vectors
))
1802 alloc_intr_gate(XEN_HVM_EVTCHN_CALLBACK
, xen_hvm_callback_vector
);
1806 void xen_callback_vector(void) {}
1809 void __init
xen_init_IRQ(void)
1813 evtchn_to_irq
= kcalloc(NR_EVENT_CHANNELS
, sizeof(*evtchn_to_irq
),
1815 BUG_ON(!evtchn_to_irq
);
1816 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++)
1817 evtchn_to_irq
[i
] = -1;
1819 init_evtchn_cpu_bindings();
1821 /* No event channels are 'live' right now. */
1822 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++)
1825 pirq_needs_eoi
= pirq_needs_eoi_flag
;
1828 if (xen_hvm_domain()) {
1829 xen_callback_vector();
1831 /* pci_xen_hvm_init must be called after native_init_IRQ so that
1832 * __acpi_register_gsi can point at the right function */
1836 struct physdev_pirq_eoi_gmfn eoi_gmfn
;
1838 irq_ctx_init(smp_processor_id());
1839 if (xen_initial_domain())
1840 pci_xen_initial_domain();
1842 pirq_eoi_map
= (void *)__get_free_page(GFP_KERNEL
|__GFP_ZERO
);
1843 eoi_gmfn
.gmfn
= virt_to_mfn(pirq_eoi_map
);
1844 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2
, &eoi_gmfn
);
1846 free_page((unsigned long) pirq_eoi_map
);
1847 pirq_eoi_map
= NULL
;
1849 pirq_needs_eoi
= pirq_check_eoi_map
;