2 * irq_comm.c: Common API for in kernel interrupt controller
3 * Copyright (c) 2007, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
22 #include <linux/kvm_host.h>
23 #include <trace/events/kvm.h>
25 #include <asm/msidef.h>
27 #include <asm/iosapic.h>
34 static inline int kvm_irq_line_state(unsigned long *irq_state
,
35 int irq_source_id
, int level
)
37 /* Logical OR for level trig interrupt */
39 set_bit(irq_source_id
, irq_state
);
41 clear_bit(irq_source_id
, irq_state
);
43 return !!(*irq_state
);
46 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry
*e
,
47 struct kvm
*kvm
, int irq_source_id
, int level
)
50 struct kvm_pic
*pic
= pic_irqchip(kvm
);
51 level
= kvm_irq_line_state(&pic
->irq_states
[e
->irqchip
.pin
],
52 irq_source_id
, level
);
53 return kvm_pic_set_irq(pic
, e
->irqchip
.pin
, level
);
59 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry
*e
,
60 struct kvm
*kvm
, int irq_source_id
, int level
)
62 struct kvm_ioapic
*ioapic
= kvm
->arch
.vioapic
;
63 level
= kvm_irq_line_state(&ioapic
->irq_states
[e
->irqchip
.pin
],
64 irq_source_id
, level
);
66 return kvm_ioapic_set_irq(ioapic
, e
->irqchip
.pin
, level
);
69 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq
*irq
)
72 return irq
->delivery_mode
==
73 (IOSAPIC_LOWEST_PRIORITY
<< IOSAPIC_DELIVERY_SHIFT
);
75 return irq
->delivery_mode
== APIC_DM_LOWEST
;
79 int kvm_irq_delivery_to_apic(struct kvm
*kvm
, struct kvm_lapic
*src
,
80 struct kvm_lapic_irq
*irq
)
83 struct kvm_vcpu
*vcpu
, *lowest
= NULL
;
85 WARN_ON(!mutex_is_locked(&kvm
->irq_lock
));
87 if (irq
->dest_mode
== 0 && irq
->dest_id
== 0xff &&
88 kvm_is_dm_lowest_prio(irq
))
89 printk(KERN_INFO
"kvm: apic: phys broadcast and lowest prio\n");
91 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
92 if (!kvm_apic_present(vcpu
))
95 if (!kvm_apic_match_dest(vcpu
, src
, irq
->shorthand
,
96 irq
->dest_id
, irq
->dest_mode
))
99 if (!kvm_is_dm_lowest_prio(irq
)) {
102 r
+= kvm_apic_set_irq(vcpu
, irq
);
106 else if (kvm_apic_compare_prio(vcpu
, lowest
) < 0)
112 r
= kvm_apic_set_irq(lowest
, irq
);
117 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry
*e
,
118 struct kvm
*kvm
, int irq_source_id
, int level
)
120 struct kvm_lapic_irq irq
;
125 trace_kvm_msi_set_irq(e
->msi
.address_lo
, e
->msi
.data
);
127 irq
.dest_id
= (e
->msi
.address_lo
&
128 MSI_ADDR_DEST_ID_MASK
) >> MSI_ADDR_DEST_ID_SHIFT
;
129 irq
.vector
= (e
->msi
.data
&
130 MSI_DATA_VECTOR_MASK
) >> MSI_DATA_VECTOR_SHIFT
;
131 irq
.dest_mode
= (1 << MSI_ADDR_DEST_MODE_SHIFT
) & e
->msi
.address_lo
;
132 irq
.trig_mode
= (1 << MSI_DATA_TRIGGER_SHIFT
) & e
->msi
.data
;
133 irq
.delivery_mode
= e
->msi
.data
& 0x700;
137 /* TODO Deal with RH bit of MSI message address */
138 return kvm_irq_delivery_to_apic(kvm
, NULL
, &irq
);
141 /* This should be called with the kvm->irq_lock mutex held
143 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
144 * = 0 Interrupt was coalesced (previous irq is still pending)
145 * > 0 Number of CPUs interrupt was delivered to
147 int kvm_set_irq(struct kvm
*kvm
, int irq_source_id
, int irq
, int level
)
149 struct kvm_kernel_irq_routing_entry
*e
;
152 trace_kvm_set_irq(irq
, level
, irq_source_id
);
154 WARN_ON(!mutex_is_locked(&kvm
->irq_lock
));
156 /* Not possible to detect if the guest uses the PIC or the
157 * IOAPIC. So set the bit in both. The guest will ignore
158 * writes to the unused one.
160 list_for_each_entry(e
, &kvm
->irq_routing
, link
)
162 int r
= e
->set(e
, kvm
, irq_source_id
, level
);
166 ret
= r
+ ((ret
< 0) ? 0 : ret
);
171 void kvm_notify_acked_irq(struct kvm
*kvm
, unsigned irqchip
, unsigned pin
)
173 struct kvm_kernel_irq_routing_entry
*e
;
174 struct kvm_irq_ack_notifier
*kian
;
175 struct hlist_node
*n
;
178 trace_kvm_ack_irq(irqchip
, pin
);
180 list_for_each_entry(e
, &kvm
->irq_routing
, link
)
181 if (e
->type
== KVM_IRQ_ROUTING_IRQCHIP
&&
182 e
->irqchip
.irqchip
== irqchip
&&
183 e
->irqchip
.pin
== pin
) {
188 hlist_for_each_entry(kian
, n
, &kvm
->arch
.irq_ack_notifier_list
, link
)
189 if (kian
->gsi
== gsi
)
190 kian
->irq_acked(kian
);
193 void kvm_register_irq_ack_notifier(struct kvm
*kvm
,
194 struct kvm_irq_ack_notifier
*kian
)
196 mutex_lock(&kvm
->irq_lock
);
197 hlist_add_head(&kian
->link
, &kvm
->arch
.irq_ack_notifier_list
);
198 mutex_unlock(&kvm
->irq_lock
);
201 void kvm_unregister_irq_ack_notifier(struct kvm
*kvm
,
202 struct kvm_irq_ack_notifier
*kian
)
204 mutex_lock(&kvm
->irq_lock
);
205 hlist_del_init(&kian
->link
);
206 mutex_unlock(&kvm
->irq_lock
);
209 int kvm_request_irq_source_id(struct kvm
*kvm
)
211 unsigned long *bitmap
= &kvm
->arch
.irq_sources_bitmap
;
214 mutex_lock(&kvm
->irq_lock
);
215 irq_source_id
= find_first_zero_bit(bitmap
,
216 sizeof(kvm
->arch
.irq_sources_bitmap
));
218 if (irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
219 printk(KERN_WARNING
"kvm: exhaust allocatable IRQ sources!\n");
223 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
224 set_bit(irq_source_id
, bitmap
);
225 mutex_unlock(&kvm
->irq_lock
);
227 return irq_source_id
;
230 void kvm_free_irq_source_id(struct kvm
*kvm
, int irq_source_id
)
234 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
236 mutex_lock(&kvm
->irq_lock
);
237 if (irq_source_id
< 0 ||
238 irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
239 printk(KERN_ERR
"kvm: IRQ source ID out of range!\n");
242 for (i
= 0; i
< KVM_IOAPIC_NUM_PINS
; i
++) {
243 clear_bit(irq_source_id
, &kvm
->arch
.vioapic
->irq_states
[i
]);
247 clear_bit(irq_source_id
, &pic_irqchip(kvm
)->irq_states
[i
]);
250 clear_bit(irq_source_id
, &kvm
->arch
.irq_sources_bitmap
);
251 mutex_unlock(&kvm
->irq_lock
);
254 void kvm_register_irq_mask_notifier(struct kvm
*kvm
, int irq
,
255 struct kvm_irq_mask_notifier
*kimn
)
257 mutex_lock(&kvm
->irq_lock
);
259 hlist_add_head(&kimn
->link
, &kvm
->mask_notifier_list
);
260 mutex_unlock(&kvm
->irq_lock
);
263 void kvm_unregister_irq_mask_notifier(struct kvm
*kvm
, int irq
,
264 struct kvm_irq_mask_notifier
*kimn
)
266 mutex_lock(&kvm
->irq_lock
);
267 hlist_del(&kimn
->link
);
268 mutex_unlock(&kvm
->irq_lock
);
271 void kvm_fire_mask_notifiers(struct kvm
*kvm
, int irq
, bool mask
)
273 struct kvm_irq_mask_notifier
*kimn
;
274 struct hlist_node
*n
;
276 WARN_ON(!mutex_is_locked(&kvm
->irq_lock
));
278 hlist_for_each_entry(kimn
, n
, &kvm
->mask_notifier_list
, link
)
279 if (kimn
->irq
== irq
)
280 kimn
->func(kimn
, mask
);
283 static void __kvm_free_irq_routing(struct list_head
*irq_routing
)
285 struct kvm_kernel_irq_routing_entry
*e
, *n
;
287 list_for_each_entry_safe(e
, n
, irq_routing
, link
)
291 void kvm_free_irq_routing(struct kvm
*kvm
)
293 mutex_lock(&kvm
->irq_lock
);
294 __kvm_free_irq_routing(&kvm
->irq_routing
);
295 mutex_unlock(&kvm
->irq_lock
);
298 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry
*e
,
299 const struct kvm_irq_routing_entry
*ue
)
307 case KVM_IRQ_ROUTING_IRQCHIP
:
309 switch (ue
->u
.irqchip
.irqchip
) {
310 case KVM_IRQCHIP_PIC_MASTER
:
311 e
->set
= kvm_set_pic_irq
;
313 case KVM_IRQCHIP_PIC_SLAVE
:
314 e
->set
= kvm_set_pic_irq
;
317 case KVM_IRQCHIP_IOAPIC
:
318 e
->set
= kvm_set_ioapic_irq
;
323 e
->irqchip
.irqchip
= ue
->u
.irqchip
.irqchip
;
324 e
->irqchip
.pin
= ue
->u
.irqchip
.pin
+ delta
;
326 case KVM_IRQ_ROUTING_MSI
:
327 e
->set
= kvm_set_msi
;
328 e
->msi
.address_lo
= ue
->u
.msi
.address_lo
;
329 e
->msi
.address_hi
= ue
->u
.msi
.address_hi
;
330 e
->msi
.data
= ue
->u
.msi
.data
;
341 int kvm_set_irq_routing(struct kvm
*kvm
,
342 const struct kvm_irq_routing_entry
*ue
,
346 struct list_head irq_list
= LIST_HEAD_INIT(irq_list
);
347 struct list_head tmp
= LIST_HEAD_INIT(tmp
);
348 struct kvm_kernel_irq_routing_entry
*e
= NULL
;
352 for (i
= 0; i
< nr
; ++i
) {
354 if (ue
->gsi
>= KVM_MAX_IRQ_ROUTES
)
359 e
= kzalloc(sizeof(*e
), GFP_KERNEL
);
362 r
= setup_routing_entry(e
, ue
);
366 list_add(&e
->link
, &irq_list
);
370 mutex_lock(&kvm
->irq_lock
);
371 list_splice(&kvm
->irq_routing
, &tmp
);
372 INIT_LIST_HEAD(&kvm
->irq_routing
);
373 list_splice(&irq_list
, &kvm
->irq_routing
);
374 INIT_LIST_HEAD(&irq_list
);
375 list_splice(&tmp
, &irq_list
);
376 mutex_unlock(&kvm
->irq_lock
);
382 __kvm_free_irq_routing(&irq_list
);
386 #define IOAPIC_ROUTING_ENTRY(irq) \
387 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
388 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
389 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
392 # define PIC_ROUTING_ENTRY(irq) \
393 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
394 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
395 # define ROUTING_ENTRY2(irq) \
396 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
398 # define ROUTING_ENTRY2(irq) \
399 IOAPIC_ROUTING_ENTRY(irq)
402 static const struct kvm_irq_routing_entry default_routing
[] = {
403 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
404 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
405 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
406 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
407 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
408 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
409 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
410 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
411 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
412 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
413 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
414 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
416 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
417 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
418 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
419 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
420 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
421 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
422 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
423 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
424 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
425 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
426 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
427 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
431 int kvm_setup_default_irq_routing(struct kvm
*kvm
)
433 return kvm_set_irq_routing(kvm
, default_routing
,
434 ARRAY_SIZE(default_routing
), 0);