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>
35 #include <asm/ptrace.h>
38 #include <asm/io_apic.h>
39 #include <asm/sync_bitops.h>
40 #include <asm/xen/page.h>
41 #include <asm/xen/pci.h>
42 #include <asm/xen/hypercall.h>
43 #include <asm/xen/hypervisor.h>
47 #include <xen/xen-ops.h>
48 #include <xen/events.h>
49 #include <xen/interface/xen.h>
50 #include <xen/interface/event_channel.h>
51 #include <xen/interface/hvm/hvm_op.h>
52 #include <xen/interface/hvm/params.h>
55 * This lock protects updates to the following mapping and reference-count
56 * arrays. The lock does not need to be acquired to read the mapping tables.
58 static DEFINE_MUTEX(irq_mapping_update_lock
);
60 static LIST_HEAD(xen_irq_list_head
);
62 /* IRQ <-> VIRQ mapping. */
63 static DEFINE_PER_CPU(int [NR_VIRQS
], virq_to_irq
) = {[0 ... NR_VIRQS
-1] = -1};
65 /* IRQ <-> IPI mapping */
66 static DEFINE_PER_CPU(int [XEN_NR_IPIS
], ipi_to_irq
) = {[0 ... XEN_NR_IPIS
-1] = -1};
68 /* Interrupt types. */
78 * Packed IRQ information:
79 * type - enum xen_irq_type
80 * event channel - irq->event channel mapping
81 * cpu - cpu this event channel is bound to
82 * index - type-specific information:
83 * PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
84 * guest, or GSI (real passthrough IRQ) of the device.
90 struct list_head list
;
92 enum xen_irq_type type
; /* type */
94 unsigned short evtchn
; /* event channel */
95 unsigned short cpu
; /* cpu bound */
103 unsigned char vector
;
109 #define PIRQ_NEEDS_EOI (1 << 0)
110 #define PIRQ_SHAREABLE (1 << 1)
112 static int *evtchn_to_irq
;
113 static unsigned long *pirq_eoi_map
;
114 static bool (*pirq_needs_eoi
)(unsigned irq
);
116 static DEFINE_PER_CPU(unsigned long [NR_EVENT_CHANNELS
/BITS_PER_LONG
],
119 /* Xen will never allocate port zero for any purpose. */
120 #define VALID_EVTCHN(chn) ((chn) != 0)
122 static struct irq_chip xen_dynamic_chip
;
123 static struct irq_chip xen_percpu_chip
;
124 static struct irq_chip xen_pirq_chip
;
125 static void enable_dynirq(struct irq_data
*data
);
126 static void disable_dynirq(struct irq_data
*data
);
128 /* Get info for IRQ */
129 static struct irq_info
*info_for_irq(unsigned irq
)
131 return irq_get_handler_data(irq
);
134 /* Constructors for packed IRQ information. */
135 static void xen_irq_info_common_init(struct irq_info
*info
,
137 enum xen_irq_type type
,
138 unsigned short evtchn
,
142 BUG_ON(info
->type
!= IRQT_UNBOUND
&& info
->type
!= type
);
146 info
->evtchn
= evtchn
;
149 evtchn_to_irq
[evtchn
] = irq
;
152 static void xen_irq_info_evtchn_init(unsigned irq
,
153 unsigned short evtchn
)
155 struct irq_info
*info
= info_for_irq(irq
);
157 xen_irq_info_common_init(info
, irq
, IRQT_EVTCHN
, evtchn
, 0);
160 static void xen_irq_info_ipi_init(unsigned cpu
,
162 unsigned short evtchn
,
165 struct irq_info
*info
= info_for_irq(irq
);
167 xen_irq_info_common_init(info
, irq
, IRQT_IPI
, evtchn
, 0);
171 per_cpu(ipi_to_irq
, cpu
)[ipi
] = irq
;
174 static void xen_irq_info_virq_init(unsigned cpu
,
176 unsigned short evtchn
,
179 struct irq_info
*info
= info_for_irq(irq
);
181 xen_irq_info_common_init(info
, irq
, IRQT_VIRQ
, evtchn
, 0);
185 per_cpu(virq_to_irq
, cpu
)[virq
] = irq
;
188 static void xen_irq_info_pirq_init(unsigned irq
,
189 unsigned short evtchn
,
192 unsigned short vector
,
196 struct irq_info
*info
= info_for_irq(irq
);
198 xen_irq_info_common_init(info
, irq
, IRQT_PIRQ
, evtchn
, 0);
200 info
->u
.pirq
.pirq
= pirq
;
201 info
->u
.pirq
.gsi
= gsi
;
202 info
->u
.pirq
.vector
= vector
;
203 info
->u
.pirq
.domid
= domid
;
204 info
->u
.pirq
.flags
= flags
;
208 * Accessors for packed IRQ information.
210 static unsigned int evtchn_from_irq(unsigned irq
)
212 if (unlikely(WARN(irq
< 0 || irq
>= nr_irqs
, "Invalid irq %d!\n", irq
)))
215 return info_for_irq(irq
)->evtchn
;
218 unsigned irq_from_evtchn(unsigned int evtchn
)
220 return evtchn_to_irq
[evtchn
];
222 EXPORT_SYMBOL_GPL(irq_from_evtchn
);
224 static enum ipi_vector
ipi_from_irq(unsigned irq
)
226 struct irq_info
*info
= info_for_irq(irq
);
228 BUG_ON(info
== NULL
);
229 BUG_ON(info
->type
!= IRQT_IPI
);
234 static unsigned virq_from_irq(unsigned irq
)
236 struct irq_info
*info
= info_for_irq(irq
);
238 BUG_ON(info
== NULL
);
239 BUG_ON(info
->type
!= IRQT_VIRQ
);
244 static unsigned pirq_from_irq(unsigned irq
)
246 struct irq_info
*info
= info_for_irq(irq
);
248 BUG_ON(info
== NULL
);
249 BUG_ON(info
->type
!= IRQT_PIRQ
);
251 return info
->u
.pirq
.pirq
;
254 static enum xen_irq_type
type_from_irq(unsigned irq
)
256 return info_for_irq(irq
)->type
;
259 static unsigned cpu_from_irq(unsigned irq
)
261 return info_for_irq(irq
)->cpu
;
264 static unsigned int cpu_from_evtchn(unsigned int evtchn
)
266 int irq
= evtchn_to_irq
[evtchn
];
270 ret
= cpu_from_irq(irq
);
275 static bool pirq_check_eoi_map(unsigned irq
)
277 return test_bit(pirq_from_irq(irq
), pirq_eoi_map
);
280 static bool pirq_needs_eoi_flag(unsigned irq
)
282 struct irq_info
*info
= info_for_irq(irq
);
283 BUG_ON(info
->type
!= IRQT_PIRQ
);
285 return info
->u
.pirq
.flags
& PIRQ_NEEDS_EOI
;
288 static inline unsigned long active_evtchns(unsigned int cpu
,
289 struct shared_info
*sh
,
292 return sh
->evtchn_pending
[idx
] &
293 per_cpu(cpu_evtchn_mask
, cpu
)[idx
] &
294 ~sh
->evtchn_mask
[idx
];
297 static void bind_evtchn_to_cpu(unsigned int chn
, unsigned int cpu
)
299 int irq
= evtchn_to_irq
[chn
];
303 cpumask_copy(irq_to_desc(irq
)->irq_data
.affinity
, cpumask_of(cpu
));
306 clear_bit(chn
, per_cpu(cpu_evtchn_mask
, cpu_from_irq(irq
)));
307 set_bit(chn
, per_cpu(cpu_evtchn_mask
, cpu
));
309 info_for_irq(irq
)->cpu
= cpu
;
312 static void init_evtchn_cpu_bindings(void)
316 struct irq_info
*info
;
318 /* By default all event channels notify CPU#0. */
319 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
320 struct irq_desc
*desc
= irq_to_desc(info
->irq
);
321 cpumask_copy(desc
->irq_data
.affinity
, cpumask_of(0));
325 for_each_possible_cpu(i
)
326 memset(per_cpu(cpu_evtchn_mask
, i
),
327 (i
== 0) ? ~0 : 0, sizeof(*per_cpu(cpu_evtchn_mask
, i
)));
330 static inline void clear_evtchn(int port
)
332 struct shared_info
*s
= HYPERVISOR_shared_info
;
333 sync_clear_bit(port
, &s
->evtchn_pending
[0]);
336 static inline void set_evtchn(int port
)
338 struct shared_info
*s
= HYPERVISOR_shared_info
;
339 sync_set_bit(port
, &s
->evtchn_pending
[0]);
342 static inline int test_evtchn(int port
)
344 struct shared_info
*s
= HYPERVISOR_shared_info
;
345 return sync_test_bit(port
, &s
->evtchn_pending
[0]);
350 * notify_remote_via_irq - send event to remote end of event channel via irq
351 * @irq: irq of event channel to send event to
353 * Unlike notify_remote_via_evtchn(), this is safe to use across
354 * save/restore. Notifications on a broken connection are silently
357 void notify_remote_via_irq(int irq
)
359 int evtchn
= evtchn_from_irq(irq
);
361 if (VALID_EVTCHN(evtchn
))
362 notify_remote_via_evtchn(evtchn
);
364 EXPORT_SYMBOL_GPL(notify_remote_via_irq
);
366 static void mask_evtchn(int port
)
368 struct shared_info
*s
= HYPERVISOR_shared_info
;
369 sync_set_bit(port
, &s
->evtchn_mask
[0]);
372 static void unmask_evtchn(int port
)
374 struct shared_info
*s
= HYPERVISOR_shared_info
;
375 unsigned int cpu
= get_cpu();
377 BUG_ON(!irqs_disabled());
379 /* Slow path (hypercall) if this is a non-local port. */
380 if (unlikely(cpu
!= cpu_from_evtchn(port
))) {
381 struct evtchn_unmask unmask
= { .port
= port
};
382 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask
, &unmask
);
384 struct vcpu_info
*vcpu_info
= __this_cpu_read(xen_vcpu
);
386 sync_clear_bit(port
, &s
->evtchn_mask
[0]);
389 * The following is basically the equivalent of
390 * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
391 * the interrupt edge' if the channel is masked.
393 if (sync_test_bit(port
, &s
->evtchn_pending
[0]) &&
394 !sync_test_and_set_bit(port
/ BITS_PER_LONG
,
395 &vcpu_info
->evtchn_pending_sel
))
396 vcpu_info
->evtchn_upcall_pending
= 1;
402 static void xen_irq_init(unsigned irq
)
404 struct irq_info
*info
;
406 struct irq_desc
*desc
= irq_to_desc(irq
);
408 /* By default all event channels notify CPU#0. */
409 cpumask_copy(desc
->irq_data
.affinity
, cpumask_of(0));
412 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
414 panic("Unable to allocate metadata for IRQ%d\n", irq
);
416 info
->type
= IRQT_UNBOUND
;
419 irq_set_handler_data(irq
, info
);
421 list_add_tail(&info
->list
, &xen_irq_list_head
);
424 static int __must_check
xen_allocate_irq_dynamic(void)
429 #ifdef CONFIG_X86_IO_APIC
431 * For an HVM guest or domain 0 which see "real" (emulated or
432 * actual respectively) GSIs we allocate dynamic IRQs
433 * e.g. those corresponding to event channels or MSIs
434 * etc. from the range above those "real" GSIs to avoid
437 if (xen_initial_domain() || xen_hvm_domain())
438 first
= get_nr_irqs_gsi();
441 irq
= irq_alloc_desc_from(first
, -1);
449 static int __must_check
xen_allocate_irq_gsi(unsigned gsi
)
454 * A PV guest has no concept of a GSI (since it has no ACPI
455 * nor access to/knowledge of the physical APICs). Therefore
456 * all IRQs are dynamically allocated from the entire IRQ
459 if (xen_pv_domain() && !xen_initial_domain())
460 return xen_allocate_irq_dynamic();
462 /* Legacy IRQ descriptors are already allocated by the arch. */
463 if (gsi
< NR_IRQS_LEGACY
)
466 irq
= irq_alloc_desc_at(gsi
, -1);
473 static void xen_free_irq(unsigned irq
)
475 struct irq_info
*info
= irq_get_handler_data(irq
);
477 list_del(&info
->list
);
479 irq_set_handler_data(irq
, NULL
);
481 WARN_ON(info
->refcnt
> 0);
485 /* Legacy IRQ descriptors are managed by the arch. */
486 if (irq
< NR_IRQS_LEGACY
)
492 static void pirq_query_unmask(int irq
)
494 struct physdev_irq_status_query irq_status
;
495 struct irq_info
*info
= info_for_irq(irq
);
497 BUG_ON(info
->type
!= IRQT_PIRQ
);
499 irq_status
.irq
= pirq_from_irq(irq
);
500 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query
, &irq_status
))
501 irq_status
.flags
= 0;
503 info
->u
.pirq
.flags
&= ~PIRQ_NEEDS_EOI
;
504 if (irq_status
.flags
& XENIRQSTAT_needs_eoi
)
505 info
->u
.pirq
.flags
|= PIRQ_NEEDS_EOI
;
508 static bool probing_irq(int irq
)
510 struct irq_desc
*desc
= irq_to_desc(irq
);
512 return desc
&& desc
->action
== NULL
;
515 static void eoi_pirq(struct irq_data
*data
)
517 int evtchn
= evtchn_from_irq(data
->irq
);
518 struct physdev_eoi eoi
= { .irq
= pirq_from_irq(data
->irq
) };
523 if (VALID_EVTCHN(evtchn
))
524 clear_evtchn(evtchn
);
526 if (pirq_needs_eoi(data
->irq
)) {
527 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_eoi
, &eoi
);
532 static void mask_ack_pirq(struct irq_data
*data
)
534 disable_dynirq(data
);
538 static unsigned int __startup_pirq(unsigned int irq
)
540 struct evtchn_bind_pirq bind_pirq
;
541 struct irq_info
*info
= info_for_irq(irq
);
542 int evtchn
= evtchn_from_irq(irq
);
545 BUG_ON(info
->type
!= IRQT_PIRQ
);
547 if (VALID_EVTCHN(evtchn
))
550 bind_pirq
.pirq
= pirq_from_irq(irq
);
551 /* NB. We are happy to share unless we are probing. */
552 bind_pirq
.flags
= info
->u
.pirq
.flags
& PIRQ_SHAREABLE
?
553 BIND_PIRQ__WILL_SHARE
: 0;
554 rc
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq
, &bind_pirq
);
556 if (!probing_irq(irq
))
557 printk(KERN_INFO
"Failed to obtain physical IRQ %d\n",
561 evtchn
= bind_pirq
.port
;
563 pirq_query_unmask(irq
);
565 evtchn_to_irq
[evtchn
] = irq
;
566 bind_evtchn_to_cpu(evtchn
, 0);
567 info
->evtchn
= evtchn
;
570 unmask_evtchn(evtchn
);
571 eoi_pirq(irq_get_irq_data(irq
));
576 static unsigned int startup_pirq(struct irq_data
*data
)
578 return __startup_pirq(data
->irq
);
581 static void shutdown_pirq(struct irq_data
*data
)
583 struct evtchn_close close
;
584 unsigned int irq
= data
->irq
;
585 struct irq_info
*info
= info_for_irq(irq
);
586 int evtchn
= evtchn_from_irq(irq
);
588 BUG_ON(info
->type
!= IRQT_PIRQ
);
590 if (!VALID_EVTCHN(evtchn
))
596 if (HYPERVISOR_event_channel_op(EVTCHNOP_close
, &close
) != 0)
599 bind_evtchn_to_cpu(evtchn
, 0);
600 evtchn_to_irq
[evtchn
] = -1;
604 static void enable_pirq(struct irq_data
*data
)
609 static void disable_pirq(struct irq_data
*data
)
611 disable_dynirq(data
);
614 int xen_irq_from_gsi(unsigned gsi
)
616 struct irq_info
*info
;
618 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
619 if (info
->type
!= IRQT_PIRQ
)
622 if (info
->u
.pirq
.gsi
== gsi
)
628 EXPORT_SYMBOL_GPL(xen_irq_from_gsi
);
631 * Do not make any assumptions regarding the relationship between the
632 * IRQ number returned here and the Xen pirq argument.
634 * Note: We don't assign an event channel until the irq actually started
635 * up. Return an existing irq if we've already got one for the gsi.
637 * Shareable implies level triggered, not shareable implies edge
640 int xen_bind_pirq_gsi_to_irq(unsigned gsi
,
641 unsigned pirq
, int shareable
, char *name
)
644 struct physdev_irq irq_op
;
646 mutex_lock(&irq_mapping_update_lock
);
648 irq
= xen_irq_from_gsi(gsi
);
650 printk(KERN_INFO
"xen_map_pirq_gsi: returning irq %d for gsi %u\n",
655 irq
= xen_allocate_irq_gsi(gsi
);
662 /* Only the privileged domain can do this. For non-priv, the pcifront
663 * driver provides a PCI bus that does the call to do exactly
664 * this in the priv domain. */
665 if (xen_initial_domain() &&
666 HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector
, &irq_op
)) {
672 xen_irq_info_pirq_init(irq
, 0, pirq
, gsi
, irq_op
.vector
, DOMID_SELF
,
673 shareable
? PIRQ_SHAREABLE
: 0);
675 pirq_query_unmask(irq
);
676 /* We try to use the handler with the appropriate semantic for the
677 * type of interrupt: if the interrupt is an edge triggered
678 * interrupt we use handle_edge_irq.
680 * On the other hand if the interrupt is level triggered we use
681 * handle_fasteoi_irq like the native code does for this kind of
684 * Depending on the Xen version, pirq_needs_eoi might return true
685 * not only for level triggered interrupts but for edge triggered
686 * interrupts too. In any case Xen always honors the eoi mechanism,
687 * not injecting any more pirqs of the same kind if the first one
688 * hasn't received an eoi yet. Therefore using the fasteoi handler
689 * is the right choice either way.
692 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
,
693 handle_fasteoi_irq
, name
);
695 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
,
696 handle_edge_irq
, name
);
699 mutex_unlock(&irq_mapping_update_lock
);
704 #ifdef CONFIG_PCI_MSI
705 int xen_allocate_pirq_msi(struct pci_dev
*dev
, struct msi_desc
*msidesc
)
708 struct physdev_get_free_pirq op_get_free_pirq
;
710 op_get_free_pirq
.type
= MAP_PIRQ_TYPE_MSI
;
711 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq
, &op_get_free_pirq
);
713 WARN_ONCE(rc
== -ENOSYS
,
714 "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
716 return rc
? -1 : op_get_free_pirq
.pirq
;
719 int xen_bind_pirq_msi_to_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
,
720 int pirq
, int vector
, const char *name
,
725 mutex_lock(&irq_mapping_update_lock
);
727 irq
= xen_allocate_irq_dynamic();
731 irq_set_chip_and_handler_name(irq
, &xen_pirq_chip
, handle_edge_irq
,
734 xen_irq_info_pirq_init(irq
, 0, pirq
, 0, vector
, domid
, 0);
735 ret
= irq_set_msi_desc(irq
, msidesc
);
739 mutex_unlock(&irq_mapping_update_lock
);
742 mutex_unlock(&irq_mapping_update_lock
);
748 int xen_destroy_irq(int irq
)
750 struct irq_desc
*desc
;
751 struct physdev_unmap_pirq unmap_irq
;
752 struct irq_info
*info
= info_for_irq(irq
);
755 mutex_lock(&irq_mapping_update_lock
);
757 desc
= irq_to_desc(irq
);
761 if (xen_initial_domain()) {
762 unmap_irq
.pirq
= info
->u
.pirq
.pirq
;
763 unmap_irq
.domid
= info
->u
.pirq
.domid
;
764 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq
, &unmap_irq
);
765 /* If another domain quits without making the pci_disable_msix
766 * call, the Xen hypervisor takes care of freeing the PIRQs
767 * (free_domain_pirqs).
769 if ((rc
== -ESRCH
&& info
->u
.pirq
.domid
!= DOMID_SELF
))
770 printk(KERN_INFO
"domain %d does not have %d anymore\n",
771 info
->u
.pirq
.domid
, info
->u
.pirq
.pirq
);
773 printk(KERN_WARNING
"unmap irq failed %d\n", rc
);
781 mutex_unlock(&irq_mapping_update_lock
);
785 int xen_irq_from_pirq(unsigned pirq
)
789 struct irq_info
*info
;
791 mutex_lock(&irq_mapping_update_lock
);
793 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
794 if (info
->type
!= IRQT_PIRQ
)
797 if (info
->u
.pirq
.pirq
== pirq
)
802 mutex_unlock(&irq_mapping_update_lock
);
808 int xen_pirq_from_irq(unsigned irq
)
810 return pirq_from_irq(irq
);
812 EXPORT_SYMBOL_GPL(xen_pirq_from_irq
);
813 int bind_evtchn_to_irq(unsigned int evtchn
)
817 mutex_lock(&irq_mapping_update_lock
);
819 irq
= evtchn_to_irq
[evtchn
];
822 irq
= xen_allocate_irq_dynamic();
826 irq_set_chip_and_handler_name(irq
, &xen_dynamic_chip
,
827 handle_edge_irq
, "event");
829 xen_irq_info_evtchn_init(irq
, evtchn
);
833 mutex_unlock(&irq_mapping_update_lock
);
837 EXPORT_SYMBOL_GPL(bind_evtchn_to_irq
);
839 static int bind_ipi_to_irq(unsigned int ipi
, unsigned int cpu
)
841 struct evtchn_bind_ipi bind_ipi
;
844 mutex_lock(&irq_mapping_update_lock
);
846 irq
= per_cpu(ipi_to_irq
, cpu
)[ipi
];
849 irq
= xen_allocate_irq_dynamic();
853 irq_set_chip_and_handler_name(irq
, &xen_percpu_chip
,
854 handle_percpu_irq
, "ipi");
857 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi
,
860 evtchn
= bind_ipi
.port
;
862 xen_irq_info_ipi_init(cpu
, irq
, evtchn
, ipi
);
864 bind_evtchn_to_cpu(evtchn
, cpu
);
868 mutex_unlock(&irq_mapping_update_lock
);
872 static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain
,
873 unsigned int remote_port
)
875 struct evtchn_bind_interdomain bind_interdomain
;
878 bind_interdomain
.remote_dom
= remote_domain
;
879 bind_interdomain
.remote_port
= remote_port
;
881 err
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain
,
884 return err
? : bind_evtchn_to_irq(bind_interdomain
.local_port
);
887 static int find_virq(unsigned int virq
, unsigned int cpu
)
889 struct evtchn_status status
;
890 int port
, rc
= -ENOENT
;
892 memset(&status
, 0, sizeof(status
));
893 for (port
= 0; port
<= NR_EVENT_CHANNELS
; port
++) {
894 status
.dom
= DOMID_SELF
;
896 rc
= HYPERVISOR_event_channel_op(EVTCHNOP_status
, &status
);
899 if (status
.status
!= EVTCHNSTAT_virq
)
901 if (status
.u
.virq
== virq
&& status
.vcpu
== cpu
) {
909 int bind_virq_to_irq(unsigned int virq
, unsigned int cpu
)
911 struct evtchn_bind_virq bind_virq
;
912 int evtchn
, irq
, ret
;
914 mutex_lock(&irq_mapping_update_lock
);
916 irq
= per_cpu(virq_to_irq
, cpu
)[virq
];
919 irq
= xen_allocate_irq_dynamic();
923 irq_set_chip_and_handler_name(irq
, &xen_percpu_chip
,
924 handle_percpu_irq
, "virq");
926 bind_virq
.virq
= virq
;
927 bind_virq
.vcpu
= cpu
;
928 ret
= HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq
,
931 evtchn
= bind_virq
.port
;
934 ret
= find_virq(virq
, cpu
);
939 xen_irq_info_virq_init(cpu
, irq
, evtchn
, virq
);
941 bind_evtchn_to_cpu(evtchn
, cpu
);
945 mutex_unlock(&irq_mapping_update_lock
);
950 static void unbind_from_irq(unsigned int irq
)
952 struct evtchn_close close
;
953 int evtchn
= evtchn_from_irq(irq
);
954 struct irq_info
*info
= irq_get_handler_data(irq
);
956 mutex_lock(&irq_mapping_update_lock
);
958 if (info
->refcnt
> 0) {
960 if (info
->refcnt
!= 0)
964 if (VALID_EVTCHN(evtchn
)) {
966 if (HYPERVISOR_event_channel_op(EVTCHNOP_close
, &close
) != 0)
969 switch (type_from_irq(irq
)) {
971 per_cpu(virq_to_irq
, cpu_from_evtchn(evtchn
))
972 [virq_from_irq(irq
)] = -1;
975 per_cpu(ipi_to_irq
, cpu_from_evtchn(evtchn
))
976 [ipi_from_irq(irq
)] = -1;
982 /* Closed ports are implicitly re-bound to VCPU0. */
983 bind_evtchn_to_cpu(evtchn
, 0);
985 evtchn_to_irq
[evtchn
] = -1;
988 BUG_ON(info_for_irq(irq
)->type
== IRQT_UNBOUND
);
993 mutex_unlock(&irq_mapping_update_lock
);
996 int bind_evtchn_to_irqhandler(unsigned int evtchn
,
997 irq_handler_t handler
,
998 unsigned long irqflags
,
999 const char *devname
, void *dev_id
)
1003 irq
= bind_evtchn_to_irq(evtchn
);
1006 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1008 unbind_from_irq(irq
);
1014 EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler
);
1016 int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain
,
1017 unsigned int remote_port
,
1018 irq_handler_t handler
,
1019 unsigned long irqflags
,
1020 const char *devname
,
1025 irq
= bind_interdomain_evtchn_to_irq(remote_domain
, remote_port
);
1029 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1031 unbind_from_irq(irq
);
1037 EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler
);
1039 int bind_virq_to_irqhandler(unsigned int virq
, unsigned int cpu
,
1040 irq_handler_t handler
,
1041 unsigned long irqflags
, const char *devname
, void *dev_id
)
1045 irq
= bind_virq_to_irq(virq
, cpu
);
1048 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1050 unbind_from_irq(irq
);
1056 EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler
);
1058 int bind_ipi_to_irqhandler(enum ipi_vector ipi
,
1060 irq_handler_t handler
,
1061 unsigned long irqflags
,
1062 const char *devname
,
1067 irq
= bind_ipi_to_irq(ipi
, cpu
);
1071 irqflags
|= IRQF_NO_SUSPEND
| IRQF_FORCE_RESUME
| IRQF_EARLY_RESUME
;
1072 retval
= request_irq(irq
, handler
, irqflags
, devname
, dev_id
);
1074 unbind_from_irq(irq
);
1081 void unbind_from_irqhandler(unsigned int irq
, void *dev_id
)
1083 free_irq(irq
, dev_id
);
1084 unbind_from_irq(irq
);
1086 EXPORT_SYMBOL_GPL(unbind_from_irqhandler
);
1088 int evtchn_make_refcounted(unsigned int evtchn
)
1090 int irq
= evtchn_to_irq
[evtchn
];
1091 struct irq_info
*info
;
1096 info
= irq_get_handler_data(irq
);
1101 WARN_ON(info
->refcnt
!= -1);
1107 EXPORT_SYMBOL_GPL(evtchn_make_refcounted
);
1109 int evtchn_get(unsigned int evtchn
)
1112 struct irq_info
*info
;
1115 if (evtchn
>= NR_EVENT_CHANNELS
)
1118 mutex_lock(&irq_mapping_update_lock
);
1120 irq
= evtchn_to_irq
[evtchn
];
1124 info
= irq_get_handler_data(irq
);
1130 if (info
->refcnt
<= 0)
1136 mutex_unlock(&irq_mapping_update_lock
);
1140 EXPORT_SYMBOL_GPL(evtchn_get
);
1142 void evtchn_put(unsigned int evtchn
)
1144 int irq
= evtchn_to_irq
[evtchn
];
1145 if (WARN_ON(irq
== -1))
1147 unbind_from_irq(irq
);
1149 EXPORT_SYMBOL_GPL(evtchn_put
);
1151 void xen_send_IPI_one(unsigned int cpu
, enum ipi_vector vector
)
1153 int irq
= per_cpu(ipi_to_irq
, cpu
)[vector
];
1155 notify_remote_via_irq(irq
);
1158 irqreturn_t
xen_debug_interrupt(int irq
, void *dev_id
)
1160 struct shared_info
*sh
= HYPERVISOR_shared_info
;
1161 int cpu
= smp_processor_id();
1162 unsigned long *cpu_evtchn
= per_cpu(cpu_evtchn_mask
, cpu
);
1164 unsigned long flags
;
1165 static DEFINE_SPINLOCK(debug_lock
);
1166 struct vcpu_info
*v
;
1168 spin_lock_irqsave(&debug_lock
, flags
);
1170 printk("\nvcpu %d\n ", cpu
);
1172 for_each_online_cpu(i
) {
1174 v
= per_cpu(xen_vcpu
, i
);
1175 pending
= (get_irq_regs() && i
== cpu
)
1176 ? xen_irqs_disabled(get_irq_regs())
1177 : v
->evtchn_upcall_mask
;
1178 printk("%d: masked=%d pending=%d event_sel %0*lx\n ", i
,
1179 pending
, v
->evtchn_upcall_pending
,
1180 (int)(sizeof(v
->evtchn_pending_sel
)*2),
1181 v
->evtchn_pending_sel
);
1183 v
= per_cpu(xen_vcpu
, cpu
);
1185 printk("\npending:\n ");
1186 for (i
= ARRAY_SIZE(sh
->evtchn_pending
)-1; i
>= 0; i
--)
1187 printk("%0*lx%s", (int)sizeof(sh
->evtchn_pending
[0])*2,
1188 sh
->evtchn_pending
[i
],
1189 i
% 8 == 0 ? "\n " : " ");
1190 printk("\nglobal mask:\n ");
1191 for (i
= ARRAY_SIZE(sh
->evtchn_mask
)-1; i
>= 0; i
--)
1193 (int)(sizeof(sh
->evtchn_mask
[0])*2),
1195 i
% 8 == 0 ? "\n " : " ");
1197 printk("\nglobally unmasked:\n ");
1198 for (i
= ARRAY_SIZE(sh
->evtchn_mask
)-1; i
>= 0; i
--)
1199 printk("%0*lx%s", (int)(sizeof(sh
->evtchn_mask
[0])*2),
1200 sh
->evtchn_pending
[i
] & ~sh
->evtchn_mask
[i
],
1201 i
% 8 == 0 ? "\n " : " ");
1203 printk("\nlocal cpu%d mask:\n ", cpu
);
1204 for (i
= (NR_EVENT_CHANNELS
/BITS_PER_LONG
)-1; i
>= 0; i
--)
1205 printk("%0*lx%s", (int)(sizeof(cpu_evtchn
[0])*2),
1207 i
% 8 == 0 ? "\n " : " ");
1209 printk("\nlocally unmasked:\n ");
1210 for (i
= ARRAY_SIZE(sh
->evtchn_mask
)-1; i
>= 0; i
--) {
1211 unsigned long pending
= sh
->evtchn_pending
[i
]
1212 & ~sh
->evtchn_mask
[i
]
1214 printk("%0*lx%s", (int)(sizeof(sh
->evtchn_mask
[0])*2),
1215 pending
, i
% 8 == 0 ? "\n " : " ");
1218 printk("\npending list:\n");
1219 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++) {
1220 if (sync_test_bit(i
, sh
->evtchn_pending
)) {
1221 int word_idx
= i
/ BITS_PER_LONG
;
1222 printk(" %d: event %d -> irq %d%s%s%s\n",
1223 cpu_from_evtchn(i
), i
,
1225 sync_test_bit(word_idx
, &v
->evtchn_pending_sel
)
1227 !sync_test_bit(i
, sh
->evtchn_mask
)
1228 ? "" : " globally-masked",
1229 sync_test_bit(i
, cpu_evtchn
)
1230 ? "" : " locally-masked");
1234 spin_unlock_irqrestore(&debug_lock
, flags
);
1239 static DEFINE_PER_CPU(unsigned, xed_nesting_count
);
1240 static DEFINE_PER_CPU(unsigned int, current_word_idx
);
1241 static DEFINE_PER_CPU(unsigned int, current_bit_idx
);
1244 * Mask out the i least significant bits of w
1246 #define MASK_LSBS(w, i) (w & ((~0UL) << i))
1249 * Search the CPUs pending events bitmasks. For each one found, map
1250 * the event number to an irq, and feed it into do_IRQ() for
1253 * Xen uses a two-level bitmap to speed searching. The first level is
1254 * a bitset of words which contain pending event bits. The second
1255 * level is a bitset of pending events themselves.
1257 static void __xen_evtchn_do_upcall(void)
1259 int start_word_idx
, start_bit_idx
;
1260 int word_idx
, bit_idx
;
1262 int cpu
= get_cpu();
1263 struct shared_info
*s
= HYPERVISOR_shared_info
;
1264 struct vcpu_info
*vcpu_info
= __this_cpu_read(xen_vcpu
);
1268 unsigned long pending_words
;
1270 vcpu_info
->evtchn_upcall_pending
= 0;
1272 if (__this_cpu_inc_return(xed_nesting_count
) - 1)
1275 #ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
1276 /* Clear master flag /before/ clearing selector flag. */
1279 pending_words
= xchg(&vcpu_info
->evtchn_pending_sel
, 0);
1281 start_word_idx
= __this_cpu_read(current_word_idx
);
1282 start_bit_idx
= __this_cpu_read(current_bit_idx
);
1284 word_idx
= start_word_idx
;
1286 for (i
= 0; pending_words
!= 0; i
++) {
1287 unsigned long pending_bits
;
1288 unsigned long words
;
1290 words
= MASK_LSBS(pending_words
, word_idx
);
1293 * If we masked out all events, wrap to beginning.
1300 word_idx
= __ffs(words
);
1302 pending_bits
= active_evtchns(cpu
, s
, word_idx
);
1303 bit_idx
= 0; /* usually scan entire word from start */
1304 if (word_idx
== start_word_idx
) {
1305 /* We scan the starting word in two parts */
1307 /* 1st time: start in the middle */
1308 bit_idx
= start_bit_idx
;
1310 /* 2nd time: mask bits done already */
1311 bit_idx
&= (1UL << start_bit_idx
) - 1;
1317 struct irq_desc
*desc
;
1319 bits
= MASK_LSBS(pending_bits
, bit_idx
);
1321 /* If we masked out all events, move on. */
1325 bit_idx
= __ffs(bits
);
1328 port
= (word_idx
* BITS_PER_LONG
) + bit_idx
;
1329 irq
= evtchn_to_irq
[port
];
1332 desc
= irq_to_desc(irq
);
1334 generic_handle_irq_desc(irq
, desc
);
1337 bit_idx
= (bit_idx
+ 1) % BITS_PER_LONG
;
1339 /* Next caller starts at last processed + 1 */
1340 __this_cpu_write(current_word_idx
,
1341 bit_idx
? word_idx
:
1342 (word_idx
+1) % BITS_PER_LONG
);
1343 __this_cpu_write(current_bit_idx
, bit_idx
);
1344 } while (bit_idx
!= 0);
1346 /* Scan start_l1i twice; all others once. */
1347 if ((word_idx
!= start_word_idx
) || (i
!= 0))
1348 pending_words
&= ~(1UL << word_idx
);
1350 word_idx
= (word_idx
+ 1) % BITS_PER_LONG
;
1353 BUG_ON(!irqs_disabled());
1355 count
= __this_cpu_read(xed_nesting_count
);
1356 __this_cpu_write(xed_nesting_count
, 0);
1357 } while (count
!= 1 || vcpu_info
->evtchn_upcall_pending
);
1364 void xen_evtchn_do_upcall(struct pt_regs
*regs
)
1366 struct pt_regs
*old_regs
= set_irq_regs(regs
);
1371 __xen_evtchn_do_upcall();
1374 set_irq_regs(old_regs
);
1377 void xen_hvm_evtchn_do_upcall(void)
1379 __xen_evtchn_do_upcall();
1381 EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall
);
1383 /* Rebind a new event channel to an existing irq. */
1384 void rebind_evtchn_irq(int evtchn
, int irq
)
1386 struct irq_info
*info
= info_for_irq(irq
);
1388 /* Make sure the irq is masked, since the new event channel
1389 will also be masked. */
1392 mutex_lock(&irq_mapping_update_lock
);
1394 /* After resume the irq<->evtchn mappings are all cleared out */
1395 BUG_ON(evtchn_to_irq
[evtchn
] != -1);
1396 /* Expect irq to have been bound before,
1397 so there should be a proper type */
1398 BUG_ON(info
->type
== IRQT_UNBOUND
);
1400 xen_irq_info_evtchn_init(irq
, evtchn
);
1402 mutex_unlock(&irq_mapping_update_lock
);
1404 /* new event channels are always bound to cpu 0 */
1405 irq_set_affinity(irq
, cpumask_of(0));
1407 /* Unmask the event channel. */
1411 /* Rebind an evtchn so that it gets delivered to a specific cpu */
1412 static int rebind_irq_to_cpu(unsigned irq
, unsigned tcpu
)
1414 struct evtchn_bind_vcpu bind_vcpu
;
1415 int evtchn
= evtchn_from_irq(irq
);
1417 if (!VALID_EVTCHN(evtchn
))
1421 * Events delivered via platform PCI interrupts are always
1422 * routed to vcpu 0 and hence cannot be rebound.
1424 if (xen_hvm_domain() && !xen_have_vector_callback
)
1427 /* Send future instances of this interrupt to other vcpu. */
1428 bind_vcpu
.port
= evtchn
;
1429 bind_vcpu
.vcpu
= tcpu
;
1432 * If this fails, it usually just indicates that we're dealing with a
1433 * virq or IPI channel, which don't actually need to be rebound. Ignore
1434 * it, but don't do the xenlinux-level rebind in that case.
1436 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu
, &bind_vcpu
) >= 0)
1437 bind_evtchn_to_cpu(evtchn
, tcpu
);
1442 static int set_affinity_irq(struct irq_data
*data
, const struct cpumask
*dest
,
1445 unsigned tcpu
= cpumask_first(dest
);
1447 return rebind_irq_to_cpu(data
->irq
, tcpu
);
1450 int resend_irq_on_evtchn(unsigned int irq
)
1452 int masked
, evtchn
= evtchn_from_irq(irq
);
1453 struct shared_info
*s
= HYPERVISOR_shared_info
;
1455 if (!VALID_EVTCHN(evtchn
))
1458 masked
= sync_test_and_set_bit(evtchn
, s
->evtchn_mask
);
1459 sync_set_bit(evtchn
, s
->evtchn_pending
);
1461 unmask_evtchn(evtchn
);
1466 static void enable_dynirq(struct irq_data
*data
)
1468 int evtchn
= evtchn_from_irq(data
->irq
);
1470 if (VALID_EVTCHN(evtchn
))
1471 unmask_evtchn(evtchn
);
1474 static void disable_dynirq(struct irq_data
*data
)
1476 int evtchn
= evtchn_from_irq(data
->irq
);
1478 if (VALID_EVTCHN(evtchn
))
1479 mask_evtchn(evtchn
);
1482 static void ack_dynirq(struct irq_data
*data
)
1484 int evtchn
= evtchn_from_irq(data
->irq
);
1488 if (VALID_EVTCHN(evtchn
))
1489 clear_evtchn(evtchn
);
1492 static void mask_ack_dynirq(struct irq_data
*data
)
1494 disable_dynirq(data
);
1498 static int retrigger_dynirq(struct irq_data
*data
)
1500 int evtchn
= evtchn_from_irq(data
->irq
);
1501 struct shared_info
*sh
= HYPERVISOR_shared_info
;
1504 if (VALID_EVTCHN(evtchn
)) {
1507 masked
= sync_test_and_set_bit(evtchn
, sh
->evtchn_mask
);
1508 sync_set_bit(evtchn
, sh
->evtchn_pending
);
1510 unmask_evtchn(evtchn
);
1517 static void restore_pirqs(void)
1519 int pirq
, rc
, irq
, gsi
;
1520 struct physdev_map_pirq map_irq
;
1521 struct irq_info
*info
;
1523 list_for_each_entry(info
, &xen_irq_list_head
, list
) {
1524 if (info
->type
!= IRQT_PIRQ
)
1527 pirq
= info
->u
.pirq
.pirq
;
1528 gsi
= info
->u
.pirq
.gsi
;
1531 /* save/restore of PT devices doesn't work, so at this point the
1532 * only devices present are GSI based emulated devices */
1536 map_irq
.domid
= DOMID_SELF
;
1537 map_irq
.type
= MAP_PIRQ_TYPE_GSI
;
1538 map_irq
.index
= gsi
;
1539 map_irq
.pirq
= pirq
;
1541 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq
, &map_irq
);
1543 printk(KERN_WARNING
"xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
1544 gsi
, irq
, pirq
, rc
);
1549 printk(KERN_DEBUG
"xen: --> irq=%d, pirq=%d\n", irq
, map_irq
.pirq
);
1551 __startup_pirq(irq
);
1555 static void restore_cpu_virqs(unsigned int cpu
)
1557 struct evtchn_bind_virq bind_virq
;
1558 int virq
, irq
, evtchn
;
1560 for (virq
= 0; virq
< NR_VIRQS
; virq
++) {
1561 if ((irq
= per_cpu(virq_to_irq
, cpu
)[virq
]) == -1)
1564 BUG_ON(virq_from_irq(irq
) != virq
);
1566 /* Get a new binding from Xen. */
1567 bind_virq
.virq
= virq
;
1568 bind_virq
.vcpu
= cpu
;
1569 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq
,
1572 evtchn
= bind_virq
.port
;
1574 /* Record the new mapping. */
1575 xen_irq_info_virq_init(cpu
, irq
, evtchn
, virq
);
1576 bind_evtchn_to_cpu(evtchn
, cpu
);
1580 static void restore_cpu_ipis(unsigned int cpu
)
1582 struct evtchn_bind_ipi bind_ipi
;
1583 int ipi
, irq
, evtchn
;
1585 for (ipi
= 0; ipi
< XEN_NR_IPIS
; ipi
++) {
1586 if ((irq
= per_cpu(ipi_to_irq
, cpu
)[ipi
]) == -1)
1589 BUG_ON(ipi_from_irq(irq
) != ipi
);
1591 /* Get a new binding from Xen. */
1592 bind_ipi
.vcpu
= cpu
;
1593 if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi
,
1596 evtchn
= bind_ipi
.port
;
1598 /* Record the new mapping. */
1599 xen_irq_info_ipi_init(cpu
, irq
, evtchn
, ipi
);
1600 bind_evtchn_to_cpu(evtchn
, cpu
);
1604 /* Clear an irq's pending state, in preparation for polling on it */
1605 void xen_clear_irq_pending(int irq
)
1607 int evtchn
= evtchn_from_irq(irq
);
1609 if (VALID_EVTCHN(evtchn
))
1610 clear_evtchn(evtchn
);
1612 EXPORT_SYMBOL(xen_clear_irq_pending
);
1613 void xen_set_irq_pending(int irq
)
1615 int evtchn
= evtchn_from_irq(irq
);
1617 if (VALID_EVTCHN(evtchn
))
1621 bool xen_test_irq_pending(int irq
)
1623 int evtchn
= evtchn_from_irq(irq
);
1626 if (VALID_EVTCHN(evtchn
))
1627 ret
= test_evtchn(evtchn
);
1632 /* Poll waiting for an irq to become pending with timeout. In the usual case,
1633 * the irq will be disabled so it won't deliver an interrupt. */
1634 void xen_poll_irq_timeout(int irq
, u64 timeout
)
1636 evtchn_port_t evtchn
= evtchn_from_irq(irq
);
1638 if (VALID_EVTCHN(evtchn
)) {
1639 struct sched_poll poll
;
1642 poll
.timeout
= timeout
;
1643 set_xen_guest_handle(poll
.ports
, &evtchn
);
1645 if (HYPERVISOR_sched_op(SCHEDOP_poll
, &poll
) != 0)
1649 EXPORT_SYMBOL(xen_poll_irq_timeout
);
1650 /* Poll waiting for an irq to become pending. In the usual case, the
1651 * irq will be disabled so it won't deliver an interrupt. */
1652 void xen_poll_irq(int irq
)
1654 xen_poll_irq_timeout(irq
, 0 /* no timeout */);
1657 /* Check whether the IRQ line is shared with other guests. */
1658 int xen_test_irq_shared(int irq
)
1660 struct irq_info
*info
= info_for_irq(irq
);
1661 struct physdev_irq_status_query irq_status
= { .irq
= info
->u
.pirq
.pirq
};
1663 if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query
, &irq_status
))
1665 return !(irq_status
.flags
& XENIRQSTAT_shared
);
1667 EXPORT_SYMBOL_GPL(xen_test_irq_shared
);
1669 void xen_irq_resume(void)
1671 unsigned int cpu
, evtchn
;
1672 struct irq_info
*info
;
1674 init_evtchn_cpu_bindings();
1676 /* New event-channel space is not 'live' yet. */
1677 for (evtchn
= 0; evtchn
< NR_EVENT_CHANNELS
; evtchn
++)
1678 mask_evtchn(evtchn
);
1680 /* No IRQ <-> event-channel mappings. */
1681 list_for_each_entry(info
, &xen_irq_list_head
, list
)
1682 info
->evtchn
= 0; /* zap event-channel binding */
1684 for (evtchn
= 0; evtchn
< NR_EVENT_CHANNELS
; evtchn
++)
1685 evtchn_to_irq
[evtchn
] = -1;
1687 for_each_possible_cpu(cpu
) {
1688 restore_cpu_virqs(cpu
);
1689 restore_cpu_ipis(cpu
);
1695 static struct irq_chip xen_dynamic_chip __read_mostly
= {
1698 .irq_disable
= disable_dynirq
,
1699 .irq_mask
= disable_dynirq
,
1700 .irq_unmask
= enable_dynirq
,
1702 .irq_ack
= ack_dynirq
,
1703 .irq_mask_ack
= mask_ack_dynirq
,
1705 .irq_set_affinity
= set_affinity_irq
,
1706 .irq_retrigger
= retrigger_dynirq
,
1709 static struct irq_chip xen_pirq_chip __read_mostly
= {
1712 .irq_startup
= startup_pirq
,
1713 .irq_shutdown
= shutdown_pirq
,
1714 .irq_enable
= enable_pirq
,
1715 .irq_disable
= disable_pirq
,
1717 .irq_mask
= disable_dynirq
,
1718 .irq_unmask
= enable_dynirq
,
1720 .irq_ack
= eoi_pirq
,
1721 .irq_eoi
= eoi_pirq
,
1722 .irq_mask_ack
= mask_ack_pirq
,
1724 .irq_set_affinity
= set_affinity_irq
,
1726 .irq_retrigger
= retrigger_dynirq
,
1729 static struct irq_chip xen_percpu_chip __read_mostly
= {
1730 .name
= "xen-percpu",
1732 .irq_disable
= disable_dynirq
,
1733 .irq_mask
= disable_dynirq
,
1734 .irq_unmask
= enable_dynirq
,
1736 .irq_ack
= ack_dynirq
,
1739 int xen_set_callback_via(uint64_t via
)
1741 struct xen_hvm_param a
;
1742 a
.domid
= DOMID_SELF
;
1743 a
.index
= HVM_PARAM_CALLBACK_IRQ
;
1745 return HYPERVISOR_hvm_op(HVMOP_set_param
, &a
);
1747 EXPORT_SYMBOL_GPL(xen_set_callback_via
);
1749 #ifdef CONFIG_XEN_PVHVM
1750 /* Vector callbacks are better than PCI interrupts to receive event
1751 * channel notifications because we can receive vector callbacks on any
1752 * vcpu and we don't need PCI support or APIC interactions. */
1753 void xen_callback_vector(void)
1756 uint64_t callback_via
;
1757 if (xen_have_vector_callback
) {
1758 callback_via
= HVM_CALLBACK_VECTOR(XEN_HVM_EVTCHN_CALLBACK
);
1759 rc
= xen_set_callback_via(callback_via
);
1761 printk(KERN_ERR
"Request for Xen HVM callback vector"
1763 xen_have_vector_callback
= 0;
1766 printk(KERN_INFO
"Xen HVM callback vector for event delivery is "
1768 /* in the restore case the vector has already been allocated */
1769 if (!test_bit(XEN_HVM_EVTCHN_CALLBACK
, used_vectors
))
1770 alloc_intr_gate(XEN_HVM_EVTCHN_CALLBACK
, xen_hvm_callback_vector
);
1774 void xen_callback_vector(void) {}
1777 void __init
xen_init_IRQ(void)
1781 evtchn_to_irq
= kcalloc(NR_EVENT_CHANNELS
, sizeof(*evtchn_to_irq
),
1783 BUG_ON(!evtchn_to_irq
);
1784 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++)
1785 evtchn_to_irq
[i
] = -1;
1787 init_evtchn_cpu_bindings();
1789 /* No event channels are 'live' right now. */
1790 for (i
= 0; i
< NR_EVENT_CHANNELS
; i
++)
1793 pirq_needs_eoi
= pirq_needs_eoi_flag
;
1795 if (xen_hvm_domain()) {
1796 xen_callback_vector();
1798 /* pci_xen_hvm_init must be called after native_init_IRQ so that
1799 * __acpi_register_gsi can point at the right function */
1802 struct physdev_pirq_eoi_gmfn eoi_gmfn
;
1804 irq_ctx_init(smp_processor_id());
1805 if (xen_initial_domain())
1806 pci_xen_initial_domain();
1808 pirq_eoi_map
= (void *)__get_free_page(GFP_KERNEL
|__GFP_ZERO
);
1809 eoi_gmfn
.gmfn
= virt_to_mfn(pirq_eoi_map
);
1810 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2
, &eoi_gmfn
);
1812 free_page((unsigned long) pirq_eoi_map
);
1813 pirq_eoi_map
= NULL
;
1815 pirq_needs_eoi
= pirq_check_eoi_map
;