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>
27 static void kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry
*e
,
28 struct kvm
*kvm
, int level
)
31 kvm_pic_set_irq(pic_irqchip(kvm
), e
->irqchip
.pin
, level
);
35 static void kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry
*e
,
36 struct kvm
*kvm
, int level
)
38 kvm_ioapic_set_irq(kvm
->arch
.vioapic
, e
->irqchip
.pin
, level
);
41 /* This should be called with the kvm->lock mutex held */
42 void kvm_set_irq(struct kvm
*kvm
, int irq_source_id
, int irq
, int level
)
44 struct kvm_kernel_irq_routing_entry
*e
;
45 unsigned long *irq_state
= (unsigned long *)&kvm
->arch
.irq_states
[irq
];
47 /* Logical OR for level trig interrupt */
49 set_bit(irq_source_id
, irq_state
);
51 clear_bit(irq_source_id
, irq_state
);
53 /* Not possible to detect if the guest uses the PIC or the
54 * IOAPIC. So set the bit in both. The guest will ignore
55 * writes to the unused one.
57 list_for_each_entry(e
, &kvm
->irq_routing
, link
)
59 e
->set(e
, kvm
, !!(*irq_state
));
62 void kvm_notify_acked_irq(struct kvm
*kvm
, unsigned irqchip
, unsigned pin
)
64 struct kvm_kernel_irq_routing_entry
*e
;
65 struct kvm_irq_ack_notifier
*kian
;
69 list_for_each_entry(e
, &kvm
->irq_routing
, link
)
70 if (e
->irqchip
.irqchip
== irqchip
&&
71 e
->irqchip
.pin
== pin
) {
76 hlist_for_each_entry(kian
, n
, &kvm
->arch
.irq_ack_notifier_list
, link
)
78 kian
->irq_acked(kian
);
81 void kvm_register_irq_ack_notifier(struct kvm
*kvm
,
82 struct kvm_irq_ack_notifier
*kian
)
84 hlist_add_head(&kian
->link
, &kvm
->arch
.irq_ack_notifier_list
);
87 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier
*kian
)
89 hlist_del_init(&kian
->link
);
92 /* The caller must hold kvm->lock mutex */
93 int kvm_request_irq_source_id(struct kvm
*kvm
)
95 unsigned long *bitmap
= &kvm
->arch
.irq_sources_bitmap
;
96 int irq_source_id
= find_first_zero_bit(bitmap
,
97 sizeof(kvm
->arch
.irq_sources_bitmap
));
99 if (irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
100 printk(KERN_WARNING
"kvm: exhaust allocatable IRQ sources!\n");
104 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
105 set_bit(irq_source_id
, bitmap
);
107 return irq_source_id
;
110 void kvm_free_irq_source_id(struct kvm
*kvm
, int irq_source_id
)
114 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
116 if (irq_source_id
< 0 ||
117 irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
118 printk(KERN_ERR
"kvm: IRQ source ID out of range!\n");
121 for (i
= 0; i
< KVM_IOAPIC_NUM_PINS
; i
++)
122 clear_bit(irq_source_id
, &kvm
->arch
.irq_states
[i
]);
123 clear_bit(irq_source_id
, &kvm
->arch
.irq_sources_bitmap
);
126 void kvm_register_irq_mask_notifier(struct kvm
*kvm
, int irq
,
127 struct kvm_irq_mask_notifier
*kimn
)
130 hlist_add_head(&kimn
->link
, &kvm
->mask_notifier_list
);
133 void kvm_unregister_irq_mask_notifier(struct kvm
*kvm
, int irq
,
134 struct kvm_irq_mask_notifier
*kimn
)
136 hlist_del(&kimn
->link
);
139 void kvm_fire_mask_notifiers(struct kvm
*kvm
, int irq
, bool mask
)
141 struct kvm_irq_mask_notifier
*kimn
;
142 struct hlist_node
*n
;
144 hlist_for_each_entry(kimn
, n
, &kvm
->mask_notifier_list
, link
)
145 if (kimn
->irq
== irq
)
146 kimn
->func(kimn
, mask
);
149 static void __kvm_free_irq_routing(struct list_head
*irq_routing
)
151 struct kvm_kernel_irq_routing_entry
*e
, *n
;
153 list_for_each_entry_safe(e
, n
, irq_routing
, link
)
157 void kvm_free_irq_routing(struct kvm
*kvm
)
159 __kvm_free_irq_routing(&kvm
->irq_routing
);
162 int setup_routing_entry(struct kvm_kernel_irq_routing_entry
*e
,
163 const struct kvm_irq_routing_entry
*ue
)
170 case KVM_IRQ_ROUTING_IRQCHIP
:
172 switch (ue
->u
.irqchip
.irqchip
) {
173 case KVM_IRQCHIP_PIC_MASTER
:
174 e
->set
= kvm_set_pic_irq
;
176 case KVM_IRQCHIP_PIC_SLAVE
:
177 e
->set
= kvm_set_pic_irq
;
180 case KVM_IRQCHIP_IOAPIC
:
181 e
->set
= kvm_set_ioapic_irq
;
186 e
->irqchip
.irqchip
= ue
->u
.irqchip
.irqchip
;
187 e
->irqchip
.pin
= ue
->u
.irqchip
.pin
+ delta
;
198 int kvm_set_irq_routing(struct kvm
*kvm
,
199 const struct kvm_irq_routing_entry
*ue
,
203 struct list_head irq_list
= LIST_HEAD_INIT(irq_list
);
204 struct list_head tmp
= LIST_HEAD_INIT(tmp
);
205 struct kvm_kernel_irq_routing_entry
*e
= NULL
;
209 for (i
= 0; i
< nr
; ++i
) {
211 if (ue
->gsi
>= KVM_MAX_IRQ_ROUTES
)
216 e
= kzalloc(sizeof(*e
), GFP_KERNEL
);
219 r
= setup_routing_entry(e
, ue
);
223 list_add(&e
->link
, &irq_list
);
227 mutex_lock(&kvm
->lock
);
228 list_splice(&kvm
->irq_routing
, &tmp
);
229 INIT_LIST_HEAD(&kvm
->irq_routing
);
230 list_splice(&irq_list
, &kvm
->irq_routing
);
231 INIT_LIST_HEAD(&irq_list
);
232 list_splice(&tmp
, &irq_list
);
233 mutex_unlock(&kvm
->lock
);
239 __kvm_free_irq_routing(&irq_list
);
243 #define IOAPIC_ROUTING_ENTRY(irq) \
244 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
245 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
246 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
249 # define PIC_ROUTING_ENTRY(irq) \
250 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
251 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
252 # define ROUTING_ENTRY2(irq) \
253 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
255 # define ROUTING_ENTRY2(irq) \
256 IOAPIC_ROUTING_ENTRY(irq)
259 static const struct kvm_irq_routing_entry default_routing
[] = {
260 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
261 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
262 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
263 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
264 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
265 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
266 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
267 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
268 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
269 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
270 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
271 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
273 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
274 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
275 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
276 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
277 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
278 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
279 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
280 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
281 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
282 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
283 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
284 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
288 int kvm_setup_default_irq_routing(struct kvm
*kvm
)
290 return kvm_set_irq_routing(kvm
, default_routing
,
291 ARRAY_SIZE(default_routing
), 0);