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> | |
79950e10 | 23 | |
79950e10 | 24 | #include <asm/msidef.h> |
79950e10 | 25 | |
3de42dc0 XZ |
26 | #include "irq.h" |
27 | ||
28 | #include "ioapic.h" | |
29 | ||
4925663a GN |
30 | static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, |
31 | struct kvm *kvm, int level) | |
399ec807 AK |
32 | { |
33 | #ifdef CONFIG_X86 | |
4925663a GN |
34 | return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level); |
35 | #else | |
36 | return -1; | |
399ec807 AK |
37 | #endif |
38 | } | |
39 | ||
4925663a GN |
40 | static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, |
41 | struct kvm *kvm, int level) | |
399ec807 | 42 | { |
4925663a | 43 | return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level); |
399ec807 AK |
44 | } |
45 | ||
4925663a GN |
46 | static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, |
47 | struct kvm *kvm, int level) | |
79950e10 | 48 | { |
71450f78 | 49 | int vcpu_id, r = -1; |
79950e10 SY |
50 | struct kvm_vcpu *vcpu; |
51 | struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); | |
52 | int dest_id = (e->msi.address_lo & MSI_ADDR_DEST_ID_MASK) | |
53 | >> MSI_ADDR_DEST_ID_SHIFT; | |
54 | int vector = (e->msi.data & MSI_DATA_VECTOR_MASK) | |
55 | >> MSI_DATA_VECTOR_SHIFT; | |
56 | int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT, | |
57 | (unsigned long *)&e->msi.address_lo); | |
58 | int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT, | |
59 | (unsigned long *)&e->msi.data); | |
60 | int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT, | |
61 | (unsigned long *)&e->msi.data); | |
62 | u32 deliver_bitmask; | |
63 | ||
64 | BUG_ON(!ioapic); | |
65 | ||
66 | deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic, | |
67 | dest_id, dest_mode); | |
68 | /* IOAPIC delivery mode value is the same as MSI here */ | |
69 | switch (delivery_mode) { | |
70 | case IOAPIC_LOWEST_PRIORITY: | |
71 | vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector, | |
72 | deliver_bitmask); | |
73 | if (vcpu != NULL) | |
71450f78 | 74 | r = kvm_apic_set_irq(vcpu, vector, trig_mode); |
79950e10 SY |
75 | else |
76 | printk(KERN_INFO "kvm: null lowest priority vcpu!\n"); | |
77 | break; | |
78 | case IOAPIC_FIXED: | |
79 | for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) { | |
80 | if (!(deliver_bitmask & (1 << vcpu_id))) | |
81 | continue; | |
82 | deliver_bitmask &= ~(1 << vcpu_id); | |
83 | vcpu = ioapic->kvm->vcpus[vcpu_id]; | |
71450f78 GN |
84 | if (vcpu) { |
85 | if (r < 0) | |
86 | r = 0; | |
87 | r += kvm_apic_set_irq(vcpu, vector, trig_mode); | |
88 | } | |
79950e10 SY |
89 | } |
90 | break; | |
91 | default: | |
92 | break; | |
93 | } | |
71450f78 | 94 | return r; |
79950e10 SY |
95 | } |
96 | ||
4925663a GN |
97 | /* This should be called with the kvm->lock mutex held |
98 | * Return value: | |
99 | * < 0 Interrupt was ignored (masked or not delivered for other reasons) | |
100 | * = 0 Interrupt was coalesced (previous irq is still pending) | |
101 | * > 0 Number of CPUs interrupt was delivered to | |
102 | */ | |
103 | int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) | |
3de42dc0 | 104 | { |
399ec807 | 105 | struct kvm_kernel_irq_routing_entry *e; |
79950e10 | 106 | unsigned long *irq_state, sig_level; |
4925663a | 107 | int ret = -1; |
79950e10 SY |
108 | |
109 | if (irq < KVM_IOAPIC_NUM_PINS) { | |
110 | irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; | |
5550af4d | 111 | |
79950e10 SY |
112 | /* Logical OR for level trig interrupt */ |
113 | if (level) | |
114 | set_bit(irq_source_id, irq_state); | |
115 | else | |
116 | clear_bit(irq_source_id, irq_state); | |
117 | sig_level = !!(*irq_state); | |
118 | } else /* Deal with MSI/MSI-X */ | |
119 | sig_level = 1; | |
5550af4d | 120 | |
3de42dc0 XZ |
121 | /* Not possible to detect if the guest uses the PIC or the |
122 | * IOAPIC. So set the bit in both. The guest will ignore | |
123 | * writes to the unused one. | |
124 | */ | |
399ec807 | 125 | list_for_each_entry(e, &kvm->irq_routing, link) |
4925663a GN |
126 | if (e->gsi == irq) { |
127 | int r = e->set(e, kvm, sig_level); | |
128 | if (r < 0) | |
129 | continue; | |
130 | ||
131 | ret = r + ((ret < 0) ? 0 : ret); | |
132 | } | |
133 | return ret; | |
3de42dc0 XZ |
134 | } |
135 | ||
44882eed | 136 | void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) |
3de42dc0 | 137 | { |
44882eed | 138 | struct kvm_kernel_irq_routing_entry *e; |
3de42dc0 XZ |
139 | struct kvm_irq_ack_notifier *kian; |
140 | struct hlist_node *n; | |
44882eed MT |
141 | unsigned gsi = pin; |
142 | ||
143 | list_for_each_entry(e, &kvm->irq_routing, link) | |
144 | if (e->irqchip.irqchip == irqchip && | |
145 | e->irqchip.pin == pin) { | |
146 | gsi = e->gsi; | |
147 | break; | |
148 | } | |
3de42dc0 XZ |
149 | |
150 | hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link) | |
151 | if (kian->gsi == gsi) | |
152 | kian->irq_acked(kian); | |
153 | } | |
154 | ||
155 | void kvm_register_irq_ack_notifier(struct kvm *kvm, | |
156 | struct kvm_irq_ack_notifier *kian) | |
157 | { | |
158 | hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list); | |
159 | } | |
160 | ||
e19e30ef | 161 | void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian) |
3de42dc0 | 162 | { |
fdd897e6 | 163 | hlist_del_init(&kian->link); |
3de42dc0 | 164 | } |
5550af4d SY |
165 | |
166 | /* The caller must hold kvm->lock mutex */ | |
167 | int kvm_request_irq_source_id(struct kvm *kvm) | |
168 | { | |
169 | unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; | |
170 | int irq_source_id = find_first_zero_bit(bitmap, | |
171 | sizeof(kvm->arch.irq_sources_bitmap)); | |
61552367 | 172 | |
5550af4d SY |
173 | if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
174 | printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); | |
61552367 MM |
175 | return -EFAULT; |
176 | } | |
177 | ||
178 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); | |
179 | set_bit(irq_source_id, bitmap); | |
180 | ||
5550af4d SY |
181 | return irq_source_id; |
182 | } | |
183 | ||
184 | void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) | |
185 | { | |
186 | int i; | |
187 | ||
61552367 MM |
188 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); |
189 | ||
190 | if (irq_source_id < 0 || | |
5550af4d SY |
191 | irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
192 | printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); | |
193 | return; | |
194 | } | |
195 | for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) | |
196 | clear_bit(irq_source_id, &kvm->arch.irq_states[i]); | |
197 | clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); | |
198 | } | |
75858a84 AK |
199 | |
200 | void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, | |
201 | struct kvm_irq_mask_notifier *kimn) | |
202 | { | |
203 | kimn->irq = irq; | |
204 | hlist_add_head(&kimn->link, &kvm->mask_notifier_list); | |
205 | } | |
206 | ||
207 | void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, | |
208 | struct kvm_irq_mask_notifier *kimn) | |
209 | { | |
210 | hlist_del(&kimn->link); | |
211 | } | |
212 | ||
213 | void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask) | |
214 | { | |
215 | struct kvm_irq_mask_notifier *kimn; | |
216 | struct hlist_node *n; | |
217 | ||
218 | hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link) | |
219 | if (kimn->irq == irq) | |
220 | kimn->func(kimn, mask); | |
221 | } | |
222 | ||
399ec807 AK |
223 | static void __kvm_free_irq_routing(struct list_head *irq_routing) |
224 | { | |
225 | struct kvm_kernel_irq_routing_entry *e, *n; | |
226 | ||
227 | list_for_each_entry_safe(e, n, irq_routing, link) | |
228 | kfree(e); | |
229 | } | |
230 | ||
231 | void kvm_free_irq_routing(struct kvm *kvm) | |
232 | { | |
233 | __kvm_free_irq_routing(&kvm->irq_routing); | |
234 | } | |
235 | ||
cded19f3 HE |
236 | static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, |
237 | const struct kvm_irq_routing_entry *ue) | |
399ec807 AK |
238 | { |
239 | int r = -EINVAL; | |
240 | int delta; | |
241 | ||
242 | e->gsi = ue->gsi; | |
243 | switch (ue->type) { | |
244 | case KVM_IRQ_ROUTING_IRQCHIP: | |
245 | delta = 0; | |
246 | switch (ue->u.irqchip.irqchip) { | |
247 | case KVM_IRQCHIP_PIC_MASTER: | |
248 | e->set = kvm_set_pic_irq; | |
249 | break; | |
250 | case KVM_IRQCHIP_PIC_SLAVE: | |
4925663a | 251 | e->set = kvm_set_pic_irq; |
399ec807 AK |
252 | delta = 8; |
253 | break; | |
254 | case KVM_IRQCHIP_IOAPIC: | |
255 | e->set = kvm_set_ioapic_irq; | |
256 | break; | |
257 | default: | |
258 | goto out; | |
259 | } | |
260 | e->irqchip.irqchip = ue->u.irqchip.irqchip; | |
261 | e->irqchip.pin = ue->u.irqchip.pin + delta; | |
262 | break; | |
79950e10 SY |
263 | case KVM_IRQ_ROUTING_MSI: |
264 | e->set = kvm_set_msi; | |
265 | e->msi.address_lo = ue->u.msi.address_lo; | |
266 | e->msi.address_hi = ue->u.msi.address_hi; | |
267 | e->msi.data = ue->u.msi.data; | |
268 | break; | |
399ec807 AK |
269 | default: |
270 | goto out; | |
271 | } | |
272 | r = 0; | |
273 | out: | |
274 | return r; | |
275 | } | |
276 | ||
277 | ||
278 | int kvm_set_irq_routing(struct kvm *kvm, | |
279 | const struct kvm_irq_routing_entry *ue, | |
280 | unsigned nr, | |
281 | unsigned flags) | |
282 | { | |
283 | struct list_head irq_list = LIST_HEAD_INIT(irq_list); | |
284 | struct list_head tmp = LIST_HEAD_INIT(tmp); | |
285 | struct kvm_kernel_irq_routing_entry *e = NULL; | |
286 | unsigned i; | |
287 | int r; | |
288 | ||
289 | for (i = 0; i < nr; ++i) { | |
290 | r = -EINVAL; | |
291 | if (ue->gsi >= KVM_MAX_IRQ_ROUTES) | |
292 | goto out; | |
293 | if (ue->flags) | |
294 | goto out; | |
295 | r = -ENOMEM; | |
296 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
297 | if (!e) | |
298 | goto out; | |
299 | r = setup_routing_entry(e, ue); | |
300 | if (r) | |
301 | goto out; | |
302 | ++ue; | |
303 | list_add(&e->link, &irq_list); | |
304 | e = NULL; | |
305 | } | |
306 | ||
307 | mutex_lock(&kvm->lock); | |
308 | list_splice(&kvm->irq_routing, &tmp); | |
309 | INIT_LIST_HEAD(&kvm->irq_routing); | |
310 | list_splice(&irq_list, &kvm->irq_routing); | |
311 | INIT_LIST_HEAD(&irq_list); | |
312 | list_splice(&tmp, &irq_list); | |
313 | mutex_unlock(&kvm->lock); | |
314 | ||
315 | r = 0; | |
316 | ||
317 | out: | |
318 | kfree(e); | |
319 | __kvm_free_irq_routing(&irq_list); | |
320 | return r; | |
321 | } | |
322 | ||
323 | #define IOAPIC_ROUTING_ENTRY(irq) \ | |
324 | { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ | |
325 | .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) } | |
326 | #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq) | |
327 | ||
328 | #ifdef CONFIG_X86 | |
399ec807 AK |
329 | # define PIC_ROUTING_ENTRY(irq) \ |
330 | { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ | |
331 | .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 } | |
332 | # define ROUTING_ENTRY2(irq) \ | |
333 | IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq) | |
334 | #else | |
335 | # define ROUTING_ENTRY2(irq) \ | |
336 | IOAPIC_ROUTING_ENTRY(irq) | |
337 | #endif | |
338 | ||
339 | static const struct kvm_irq_routing_entry default_routing[] = { | |
340 | ROUTING_ENTRY2(0), ROUTING_ENTRY2(1), | |
341 | ROUTING_ENTRY2(2), ROUTING_ENTRY2(3), | |
342 | ROUTING_ENTRY2(4), ROUTING_ENTRY2(5), | |
343 | ROUTING_ENTRY2(6), ROUTING_ENTRY2(7), | |
344 | ROUTING_ENTRY2(8), ROUTING_ENTRY2(9), | |
345 | ROUTING_ENTRY2(10), ROUTING_ENTRY2(11), | |
346 | ROUTING_ENTRY2(12), ROUTING_ENTRY2(13), | |
347 | ROUTING_ENTRY2(14), ROUTING_ENTRY2(15), | |
348 | ROUTING_ENTRY1(16), ROUTING_ENTRY1(17), | |
349 | ROUTING_ENTRY1(18), ROUTING_ENTRY1(19), | |
350 | ROUTING_ENTRY1(20), ROUTING_ENTRY1(21), | |
351 | ROUTING_ENTRY1(22), ROUTING_ENTRY1(23), | |
352 | #ifdef CONFIG_IA64 | |
353 | ROUTING_ENTRY1(24), ROUTING_ENTRY1(25), | |
354 | ROUTING_ENTRY1(26), ROUTING_ENTRY1(27), | |
355 | ROUTING_ENTRY1(28), ROUTING_ENTRY1(29), | |
356 | ROUTING_ENTRY1(30), ROUTING_ENTRY1(31), | |
357 | ROUTING_ENTRY1(32), ROUTING_ENTRY1(33), | |
358 | ROUTING_ENTRY1(34), ROUTING_ENTRY1(35), | |
359 | ROUTING_ENTRY1(36), ROUTING_ENTRY1(37), | |
360 | ROUTING_ENTRY1(38), ROUTING_ENTRY1(39), | |
361 | ROUTING_ENTRY1(40), ROUTING_ENTRY1(41), | |
362 | ROUTING_ENTRY1(42), ROUTING_ENTRY1(43), | |
363 | ROUTING_ENTRY1(44), ROUTING_ENTRY1(45), | |
364 | ROUTING_ENTRY1(46), ROUTING_ENTRY1(47), | |
365 | #endif | |
366 | }; | |
367 | ||
368 | int kvm_setup_default_irq_routing(struct kvm *kvm) | |
369 | { | |
370 | return kvm_set_irq_routing(kvm, default_routing, | |
371 | ARRAY_SIZE(default_routing), 0); | |
372 | } |