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>
24 #include <asm/msidef.h>
30 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry
*e
,
31 struct kvm
*kvm
, int level
)
34 return kvm_pic_set_irq(pic_irqchip(kvm
), e
->irqchip
.pin
, level
);
40 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry
*e
,
41 struct kvm
*kvm
, int level
)
43 return kvm_ioapic_set_irq(kvm
->arch
.vioapic
, e
->irqchip
.pin
, level
);
46 void kvm_get_intr_delivery_bitmask(struct kvm
*kvm
,
47 union kvm_ioapic_redirect_entry
*entry
,
48 unsigned long *deliver_bitmask
)
51 struct kvm_vcpu
*vcpu
;
53 bitmap_zero(deliver_bitmask
, KVM_MAX_VCPUS
);
55 if (entry
->fields
.dest_mode
== 0) { /* Physical mode. */
56 if (entry
->fields
.dest_id
== 0xFF) { /* Broadcast. */
57 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
)
58 if (kvm
->vcpus
[i
] && kvm
->vcpus
[i
]->arch
.apic
)
59 __set_bit(i
, deliver_bitmask
);
60 /* Lowest priority shouldn't combine with broadcast */
61 if (entry
->fields
.delivery_mode
==
62 IOAPIC_LOWEST_PRIORITY
&& printk_ratelimit())
63 printk(KERN_INFO
"kvm: apic: phys broadcast "
67 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
71 if (kvm_apic_match_physical_addr(vcpu
->arch
.apic
,
72 entry
->fields
.dest_id
)) {
74 __set_bit(i
, deliver_bitmask
);
78 } else if (entry
->fields
.dest_id
!= 0) /* Logical mode, MDA non-zero. */
79 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
83 if (vcpu
->arch
.apic
&&
84 kvm_apic_match_logical_addr(vcpu
->arch
.apic
,
85 entry
->fields
.dest_id
))
86 __set_bit(i
, deliver_bitmask
);
89 switch (entry
->fields
.delivery_mode
) {
90 case IOAPIC_LOWEST_PRIORITY
:
91 /* Select one in deliver_bitmask */
92 vcpu
= kvm_get_lowest_prio_vcpu(kvm
,
93 entry
->fields
.vector
, deliver_bitmask
);
94 bitmap_zero(deliver_bitmask
, KVM_MAX_VCPUS
);
97 __set_bit(vcpu
->vcpu_id
, deliver_bitmask
);
103 if (printk_ratelimit())
104 printk(KERN_INFO
"kvm: unsupported delivery mode %d\n",
105 entry
->fields
.delivery_mode
);
106 bitmap_zero(deliver_bitmask
, KVM_MAX_VCPUS
);
110 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry
*e
,
111 struct kvm
*kvm
, int level
)
113 union kvm_ioapic_redirect_entry entry
;
116 entry
.fields
.dest_id
= (e
->msi
.address_lo
&
117 MSI_ADDR_DEST_ID_MASK
) >> MSI_ADDR_DEST_ID_SHIFT
;
118 entry
.fields
.vector
= (e
->msi
.data
&
119 MSI_DATA_VECTOR_MASK
) >> MSI_DATA_VECTOR_SHIFT
;
120 entry
.fields
.dest_mode
= test_bit(MSI_ADDR_DEST_MODE_SHIFT
,
121 (unsigned long *)&e
->msi
.address_lo
);
122 entry
.fields
.trig_mode
= test_bit(MSI_DATA_TRIGGER_SHIFT
,
123 (unsigned long *)&e
->msi
.data
);
124 entry
.fields
.delivery_mode
= test_bit(
125 MSI_DATA_DELIVERY_MODE_SHIFT
,
126 (unsigned long *)&e
->msi
.data
);
128 /* TODO Deal with RH bit of MSI message address */
129 return ioapic_deliver_entry(kvm
, &entry
);
132 /* This should be called with the kvm->lock mutex held
134 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
135 * = 0 Interrupt was coalesced (previous irq is still pending)
136 * > 0 Number of CPUs interrupt was delivered to
138 int kvm_set_irq(struct kvm
*kvm
, int irq_source_id
, int irq
, int level
)
140 struct kvm_kernel_irq_routing_entry
*e
;
141 unsigned long *irq_state
, sig_level
;
144 if (irq
< KVM_IOAPIC_NUM_PINS
) {
145 irq_state
= (unsigned long *)&kvm
->arch
.irq_states
[irq
];
147 /* Logical OR for level trig interrupt */
149 set_bit(irq_source_id
, irq_state
);
151 clear_bit(irq_source_id
, irq_state
);
152 sig_level
= !!(*irq_state
);
153 } else /* Deal with MSI/MSI-X */
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
, sig_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 list_for_each_entry(e
, &kvm
->irq_routing
, link
)
179 if (e
->irqchip
.irqchip
== irqchip
&&
180 e
->irqchip
.pin
== pin
) {
185 hlist_for_each_entry(kian
, n
, &kvm
->arch
.irq_ack_notifier_list
, link
)
186 if (kian
->gsi
== gsi
)
187 kian
->irq_acked(kian
);
190 void kvm_register_irq_ack_notifier(struct kvm
*kvm
,
191 struct kvm_irq_ack_notifier
*kian
)
193 hlist_add_head(&kian
->link
, &kvm
->arch
.irq_ack_notifier_list
);
196 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier
*kian
)
198 hlist_del_init(&kian
->link
);
201 /* The caller must hold kvm->lock mutex */
202 int kvm_request_irq_source_id(struct kvm
*kvm
)
204 unsigned long *bitmap
= &kvm
->arch
.irq_sources_bitmap
;
205 int irq_source_id
= find_first_zero_bit(bitmap
,
206 sizeof(kvm
->arch
.irq_sources_bitmap
));
208 if (irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
209 printk(KERN_WARNING
"kvm: exhaust allocatable IRQ sources!\n");
213 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
214 set_bit(irq_source_id
, bitmap
);
216 return irq_source_id
;
219 void kvm_free_irq_source_id(struct kvm
*kvm
, int irq_source_id
)
223 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
225 if (irq_source_id
< 0 ||
226 irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
227 printk(KERN_ERR
"kvm: IRQ source ID out of range!\n");
230 for (i
= 0; i
< KVM_IOAPIC_NUM_PINS
; i
++)
231 clear_bit(irq_source_id
, &kvm
->arch
.irq_states
[i
]);
232 clear_bit(irq_source_id
, &kvm
->arch
.irq_sources_bitmap
);
235 void kvm_register_irq_mask_notifier(struct kvm
*kvm
, int irq
,
236 struct kvm_irq_mask_notifier
*kimn
)
239 hlist_add_head(&kimn
->link
, &kvm
->mask_notifier_list
);
242 void kvm_unregister_irq_mask_notifier(struct kvm
*kvm
, int irq
,
243 struct kvm_irq_mask_notifier
*kimn
)
245 hlist_del(&kimn
->link
);
248 void kvm_fire_mask_notifiers(struct kvm
*kvm
, int irq
, bool mask
)
250 struct kvm_irq_mask_notifier
*kimn
;
251 struct hlist_node
*n
;
253 hlist_for_each_entry(kimn
, n
, &kvm
->mask_notifier_list
, link
)
254 if (kimn
->irq
== irq
)
255 kimn
->func(kimn
, mask
);
258 static void __kvm_free_irq_routing(struct list_head
*irq_routing
)
260 struct kvm_kernel_irq_routing_entry
*e
, *n
;
262 list_for_each_entry_safe(e
, n
, irq_routing
, link
)
266 void kvm_free_irq_routing(struct kvm
*kvm
)
268 __kvm_free_irq_routing(&kvm
->irq_routing
);
271 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry
*e
,
272 const struct kvm_irq_routing_entry
*ue
)
279 case KVM_IRQ_ROUTING_IRQCHIP
:
281 switch (ue
->u
.irqchip
.irqchip
) {
282 case KVM_IRQCHIP_PIC_MASTER
:
283 e
->set
= kvm_set_pic_irq
;
285 case KVM_IRQCHIP_PIC_SLAVE
:
286 e
->set
= kvm_set_pic_irq
;
289 case KVM_IRQCHIP_IOAPIC
:
290 e
->set
= kvm_set_ioapic_irq
;
295 e
->irqchip
.irqchip
= ue
->u
.irqchip
.irqchip
;
296 e
->irqchip
.pin
= ue
->u
.irqchip
.pin
+ delta
;
298 case KVM_IRQ_ROUTING_MSI
:
299 e
->set
= kvm_set_msi
;
300 e
->msi
.address_lo
= ue
->u
.msi
.address_lo
;
301 e
->msi
.address_hi
= ue
->u
.msi
.address_hi
;
302 e
->msi
.data
= ue
->u
.msi
.data
;
313 int kvm_set_irq_routing(struct kvm
*kvm
,
314 const struct kvm_irq_routing_entry
*ue
,
318 struct list_head irq_list
= LIST_HEAD_INIT(irq_list
);
319 struct list_head tmp
= LIST_HEAD_INIT(tmp
);
320 struct kvm_kernel_irq_routing_entry
*e
= NULL
;
324 for (i
= 0; i
< nr
; ++i
) {
326 if (ue
->gsi
>= KVM_MAX_IRQ_ROUTES
)
331 e
= kzalloc(sizeof(*e
), GFP_KERNEL
);
334 r
= setup_routing_entry(e
, ue
);
338 list_add(&e
->link
, &irq_list
);
342 mutex_lock(&kvm
->lock
);
343 list_splice(&kvm
->irq_routing
, &tmp
);
344 INIT_LIST_HEAD(&kvm
->irq_routing
);
345 list_splice(&irq_list
, &kvm
->irq_routing
);
346 INIT_LIST_HEAD(&irq_list
);
347 list_splice(&tmp
, &irq_list
);
348 mutex_unlock(&kvm
->lock
);
354 __kvm_free_irq_routing(&irq_list
);
358 #define IOAPIC_ROUTING_ENTRY(irq) \
359 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
360 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
361 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
364 # define PIC_ROUTING_ENTRY(irq) \
365 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
366 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
367 # define ROUTING_ENTRY2(irq) \
368 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
370 # define ROUTING_ENTRY2(irq) \
371 IOAPIC_ROUTING_ENTRY(irq)
374 static const struct kvm_irq_routing_entry default_routing
[] = {
375 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
376 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
377 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
378 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
379 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
380 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
381 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
382 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
383 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
384 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
385 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
386 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
388 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
389 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
390 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
391 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
392 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
393 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
394 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
395 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
396 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
397 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
398 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
399 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
403 int kvm_setup_default_irq_routing(struct kvm
*kvm
)
405 return kvm_set_irq_routing(kvm
, default_routing
,
406 ARRAY_SIZE(default_routing
), 0);