Commit | Line | Data |
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3de42dc0 XZ |
1 | /* |
2 | * irq_comm.c: Common API for in kernel interrupt controller | |
3 | * Copyright (c) 2007, Intel Corporation. | |
4 | * | |
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. | |
8 | * | |
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 | |
12 | * more details. | |
13 | * | |
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. | |
17 | * Authors: | |
18 | * Yaozu (Eddie) Dong <Eddie.dong@intel.com> | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/kvm_host.h> | |
23 | #include "irq.h" | |
24 | ||
25 | #include "ioapic.h" | |
26 | ||
399ec807 AK |
27 | static void kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, |
28 | struct kvm *kvm, int level) | |
29 | { | |
30 | #ifdef CONFIG_X86 | |
31 | kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level); | |
32 | #endif | |
33 | } | |
34 | ||
35 | static void kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, | |
36 | struct kvm *kvm, int level) | |
37 | { | |
38 | kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level); | |
39 | } | |
40 | ||
3de42dc0 | 41 | /* This should be called with the kvm->lock mutex held */ |
5550af4d | 42 | void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) |
3de42dc0 | 43 | { |
399ec807 | 44 | struct kvm_kernel_irq_routing_entry *e; |
5550af4d SY |
45 | unsigned long *irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; |
46 | ||
47 | /* Logical OR for level trig interrupt */ | |
48 | if (level) | |
49 | set_bit(irq_source_id, irq_state); | |
50 | else | |
51 | clear_bit(irq_source_id, irq_state); | |
52 | ||
3de42dc0 XZ |
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. | |
56 | */ | |
399ec807 AK |
57 | list_for_each_entry(e, &kvm->irq_routing, link) |
58 | if (e->gsi == irq) | |
59 | e->set(e, kvm, !!(*irq_state)); | |
3de42dc0 XZ |
60 | } |
61 | ||
44882eed | 62 | void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) |
3de42dc0 | 63 | { |
44882eed | 64 | struct kvm_kernel_irq_routing_entry *e; |
3de42dc0 XZ |
65 | struct kvm_irq_ack_notifier *kian; |
66 | struct hlist_node *n; | |
44882eed MT |
67 | unsigned gsi = pin; |
68 | ||
69 | list_for_each_entry(e, &kvm->irq_routing, link) | |
70 | if (e->irqchip.irqchip == irqchip && | |
71 | e->irqchip.pin == pin) { | |
72 | gsi = e->gsi; | |
73 | break; | |
74 | } | |
3de42dc0 XZ |
75 | |
76 | hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link) | |
77 | if (kian->gsi == gsi) | |
78 | kian->irq_acked(kian); | |
79 | } | |
80 | ||
81 | void kvm_register_irq_ack_notifier(struct kvm *kvm, | |
82 | struct kvm_irq_ack_notifier *kian) | |
83 | { | |
84 | hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list); | |
85 | } | |
86 | ||
e19e30ef | 87 | void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian) |
3de42dc0 | 88 | { |
fdd897e6 | 89 | hlist_del_init(&kian->link); |
3de42dc0 | 90 | } |
5550af4d SY |
91 | |
92 | /* The caller must hold kvm->lock mutex */ | |
93 | int kvm_request_irq_source_id(struct kvm *kvm) | |
94 | { | |
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)); | |
61552367 | 98 | |
5550af4d SY |
99 | if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
100 | printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); | |
61552367 MM |
101 | return -EFAULT; |
102 | } | |
103 | ||
104 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); | |
105 | set_bit(irq_source_id, bitmap); | |
106 | ||
5550af4d SY |
107 | return irq_source_id; |
108 | } | |
109 | ||
110 | void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) | |
111 | { | |
112 | int i; | |
113 | ||
61552367 MM |
114 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); |
115 | ||
116 | if (irq_source_id < 0 || | |
5550af4d SY |
117 | irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
118 | printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); | |
119 | return; | |
120 | } | |
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); | |
124 | } | |
75858a84 AK |
125 | |
126 | void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, | |
127 | struct kvm_irq_mask_notifier *kimn) | |
128 | { | |
129 | kimn->irq = irq; | |
130 | hlist_add_head(&kimn->link, &kvm->mask_notifier_list); | |
131 | } | |
132 | ||
133 | void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, | |
134 | struct kvm_irq_mask_notifier *kimn) | |
135 | { | |
136 | hlist_del(&kimn->link); | |
137 | } | |
138 | ||
139 | void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask) | |
140 | { | |
141 | struct kvm_irq_mask_notifier *kimn; | |
142 | struct hlist_node *n; | |
143 | ||
144 | hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link) | |
145 | if (kimn->irq == irq) | |
146 | kimn->func(kimn, mask); | |
147 | } | |
148 | ||
399ec807 AK |
149 | static void __kvm_free_irq_routing(struct list_head *irq_routing) |
150 | { | |
151 | struct kvm_kernel_irq_routing_entry *e, *n; | |
152 | ||
153 | list_for_each_entry_safe(e, n, irq_routing, link) | |
154 | kfree(e); | |
155 | } | |
156 | ||
157 | void kvm_free_irq_routing(struct kvm *kvm) | |
158 | { | |
159 | __kvm_free_irq_routing(&kvm->irq_routing); | |
160 | } | |
161 | ||
162 | int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, | |
163 | const struct kvm_irq_routing_entry *ue) | |
164 | { | |
165 | int r = -EINVAL; | |
166 | int delta; | |
167 | ||
168 | e->gsi = ue->gsi; | |
169 | switch (ue->type) { | |
170 | case KVM_IRQ_ROUTING_IRQCHIP: | |
171 | delta = 0; | |
172 | switch (ue->u.irqchip.irqchip) { | |
173 | case KVM_IRQCHIP_PIC_MASTER: | |
174 | e->set = kvm_set_pic_irq; | |
175 | break; | |
176 | case KVM_IRQCHIP_PIC_SLAVE: | |
177 | e->set = kvm_set_pic_irq; | |
178 | delta = 8; | |
179 | break; | |
180 | case KVM_IRQCHIP_IOAPIC: | |
181 | e->set = kvm_set_ioapic_irq; | |
182 | break; | |
183 | default: | |
184 | goto out; | |
185 | } | |
186 | e->irqchip.irqchip = ue->u.irqchip.irqchip; | |
187 | e->irqchip.pin = ue->u.irqchip.pin + delta; | |
188 | break; | |
189 | default: | |
190 | goto out; | |
191 | } | |
192 | r = 0; | |
193 | out: | |
194 | return r; | |
195 | } | |
196 | ||
197 | ||
198 | int kvm_set_irq_routing(struct kvm *kvm, | |
199 | const struct kvm_irq_routing_entry *ue, | |
200 | unsigned nr, | |
201 | unsigned flags) | |
202 | { | |
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; | |
206 | unsigned i; | |
207 | int r; | |
208 | ||
209 | for (i = 0; i < nr; ++i) { | |
210 | r = -EINVAL; | |
211 | if (ue->gsi >= KVM_MAX_IRQ_ROUTES) | |
212 | goto out; | |
213 | if (ue->flags) | |
214 | goto out; | |
215 | r = -ENOMEM; | |
216 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
217 | if (!e) | |
218 | goto out; | |
219 | r = setup_routing_entry(e, ue); | |
220 | if (r) | |
221 | goto out; | |
222 | ++ue; | |
223 | list_add(&e->link, &irq_list); | |
224 | e = NULL; | |
225 | } | |
226 | ||
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); | |
234 | ||
235 | r = 0; | |
236 | ||
237 | out: | |
238 | kfree(e); | |
239 | __kvm_free_irq_routing(&irq_list); | |
240 | return r; | |
241 | } | |
242 | ||
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) | |
247 | ||
248 | #ifdef CONFIG_X86 | |
399ec807 AK |
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) | |
254 | #else | |
255 | # define ROUTING_ENTRY2(irq) \ | |
256 | IOAPIC_ROUTING_ENTRY(irq) | |
257 | #endif | |
258 | ||
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), | |
272 | #ifdef CONFIG_IA64 | |
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), | |
285 | #endif | |
286 | }; | |
287 | ||
288 | int kvm_setup_default_irq_routing(struct kvm *kvm) | |
289 | { | |
290 | return kvm_set_irq_routing(kvm, default_routing, | |
291 | ARRAY_SIZE(default_routing), 0); | |
292 | } |