Commit | Line | Data |
---|---|---|
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> |
58c2dde1 GN |
25 | #ifdef CONFIG_IA64 |
26 | #include <asm/iosapic.h> | |
27 | #endif | |
79950e10 | 28 | |
3de42dc0 XZ |
29 | #include "irq.h" |
30 | ||
31 | #include "ioapic.h" | |
32 | ||
4925663a GN |
33 | static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, |
34 | struct kvm *kvm, int level) | |
399ec807 AK |
35 | { |
36 | #ifdef CONFIG_X86 | |
4925663a GN |
37 | return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level); |
38 | #else | |
39 | return -1; | |
399ec807 AK |
40 | #endif |
41 | } | |
42 | ||
4925663a GN |
43 | static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, |
44 | struct kvm *kvm, int level) | |
399ec807 | 45 | { |
4925663a | 46 | return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level); |
399ec807 AK |
47 | } |
48 | ||
58c2dde1 | 49 | inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq) |
116191b6 | 50 | { |
58c2dde1 GN |
51 | #ifdef CONFIG_IA64 |
52 | return irq->delivery_mode == | |
53 | (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT); | |
54 | #else | |
55 | return irq->delivery_mode == APIC_DM_LOWEST; | |
56 | #endif | |
57 | } | |
116191b6 | 58 | |
58c2dde1 GN |
59 | int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, |
60 | struct kvm_lapic_irq *irq) | |
61 | { | |
62 | int i, r = -1; | |
63 | struct kvm_vcpu *vcpu, *lowest = NULL; | |
64 | ||
fa40a821 MT |
65 | WARN_ON(!mutex_is_locked(&kvm->irq_lock)); |
66 | ||
58c2dde1 GN |
67 | if (irq->dest_mode == 0 && irq->dest_id == 0xff && |
68 | kvm_is_dm_lowest_prio(irq)) | |
343f94fe GN |
69 | printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); |
70 | ||
343f94fe GN |
71 | for (i = 0; i < KVM_MAX_VCPUS; i++) { |
72 | vcpu = kvm->vcpus[i]; | |
74a3a8f1 | 73 | |
343f94fe GN |
74 | if (!vcpu || !kvm_apic_present(vcpu)) |
75 | continue; | |
76 | ||
58c2dde1 GN |
77 | if (!kvm_apic_match_dest(vcpu, src, irq->shorthand, |
78 | irq->dest_id, irq->dest_mode)) | |
343f94fe GN |
79 | continue; |
80 | ||
58c2dde1 GN |
81 | if (!kvm_is_dm_lowest_prio(irq)) { |
82 | if (r < 0) | |
83 | r = 0; | |
84 | r += kvm_apic_set_irq(vcpu, irq); | |
e1035715 | 85 | } else { |
58c2dde1 GN |
86 | if (!lowest) |
87 | lowest = vcpu; | |
88 | else if (kvm_apic_compare_prio(vcpu, lowest) < 0) | |
89 | lowest = vcpu; | |
e1035715 | 90 | } |
343f94fe GN |
91 | } |
92 | ||
58c2dde1 GN |
93 | if (lowest) |
94 | r = kvm_apic_set_irq(lowest, irq); | |
95 | ||
96 | return r; | |
116191b6 SY |
97 | } |
98 | ||
4925663a GN |
99 | static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, |
100 | struct kvm *kvm, int level) | |
79950e10 | 101 | { |
58c2dde1 | 102 | struct kvm_lapic_irq irq; |
79950e10 | 103 | |
58c2dde1 | 104 | irq.dest_id = (e->msi.address_lo & |
116191b6 | 105 | MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; |
58c2dde1 | 106 | irq.vector = (e->msi.data & |
116191b6 | 107 | MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT; |
58c2dde1 GN |
108 | irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo; |
109 | irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data; | |
110 | irq.delivery_mode = e->msi.data & 0x700; | |
111 | irq.level = 1; | |
112 | irq.shorthand = 0; | |
116191b6 SY |
113 | |
114 | /* TODO Deal with RH bit of MSI message address */ | |
58c2dde1 | 115 | return kvm_irq_delivery_to_apic(kvm, NULL, &irq); |
79950e10 SY |
116 | } |
117 | ||
fa40a821 | 118 | /* This should be called with the kvm->irq_lock mutex held |
4925663a GN |
119 | * Return value: |
120 | * < 0 Interrupt was ignored (masked or not delivered for other reasons) | |
121 | * = 0 Interrupt was coalesced (previous irq is still pending) | |
122 | * > 0 Number of CPUs interrupt was delivered to | |
123 | */ | |
124 | int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) | |
3de42dc0 | 125 | { |
399ec807 | 126 | struct kvm_kernel_irq_routing_entry *e; |
79950e10 | 127 | unsigned long *irq_state, sig_level; |
4925663a | 128 | int ret = -1; |
79950e10 | 129 | |
fa40a821 MT |
130 | WARN_ON(!mutex_is_locked(&kvm->irq_lock)); |
131 | ||
79950e10 SY |
132 | if (irq < KVM_IOAPIC_NUM_PINS) { |
133 | irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; | |
5550af4d | 134 | |
79950e10 SY |
135 | /* Logical OR for level trig interrupt */ |
136 | if (level) | |
137 | set_bit(irq_source_id, irq_state); | |
138 | else | |
139 | clear_bit(irq_source_id, irq_state); | |
140 | sig_level = !!(*irq_state); | |
141 | } else /* Deal with MSI/MSI-X */ | |
142 | sig_level = 1; | |
5550af4d | 143 | |
3de42dc0 XZ |
144 | /* Not possible to detect if the guest uses the PIC or the |
145 | * IOAPIC. So set the bit in both. The guest will ignore | |
146 | * writes to the unused one. | |
147 | */ | |
399ec807 | 148 | list_for_each_entry(e, &kvm->irq_routing, link) |
4925663a GN |
149 | if (e->gsi == irq) { |
150 | int r = e->set(e, kvm, sig_level); | |
151 | if (r < 0) | |
152 | continue; | |
153 | ||
154 | ret = r + ((ret < 0) ? 0 : ret); | |
155 | } | |
156 | return ret; | |
3de42dc0 XZ |
157 | } |
158 | ||
44882eed | 159 | void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) |
3de42dc0 | 160 | { |
44882eed | 161 | struct kvm_kernel_irq_routing_entry *e; |
3de42dc0 XZ |
162 | struct kvm_irq_ack_notifier *kian; |
163 | struct hlist_node *n; | |
44882eed MT |
164 | unsigned gsi = pin; |
165 | ||
166 | list_for_each_entry(e, &kvm->irq_routing, link) | |
5116d8f6 MT |
167 | if (e->type == KVM_IRQ_ROUTING_IRQCHIP && |
168 | e->irqchip.irqchip == irqchip && | |
44882eed MT |
169 | e->irqchip.pin == pin) { |
170 | gsi = e->gsi; | |
171 | break; | |
172 | } | |
3de42dc0 XZ |
173 | |
174 | hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link) | |
175 | if (kian->gsi == gsi) | |
176 | kian->irq_acked(kian); | |
177 | } | |
178 | ||
179 | void kvm_register_irq_ack_notifier(struct kvm *kvm, | |
180 | struct kvm_irq_ack_notifier *kian) | |
181 | { | |
fa40a821 | 182 | mutex_lock(&kvm->irq_lock); |
3de42dc0 | 183 | hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list); |
fa40a821 | 184 | mutex_unlock(&kvm->irq_lock); |
3de42dc0 XZ |
185 | } |
186 | ||
fa40a821 MT |
187 | void kvm_unregister_irq_ack_notifier(struct kvm *kvm, |
188 | struct kvm_irq_ack_notifier *kian) | |
3de42dc0 | 189 | { |
fa40a821 | 190 | mutex_lock(&kvm->irq_lock); |
fdd897e6 | 191 | hlist_del_init(&kian->link); |
fa40a821 | 192 | mutex_unlock(&kvm->irq_lock); |
3de42dc0 | 193 | } |
5550af4d | 194 | |
5550af4d SY |
195 | int kvm_request_irq_source_id(struct kvm *kvm) |
196 | { | |
197 | unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; | |
fa40a821 MT |
198 | int irq_source_id; |
199 | ||
200 | mutex_lock(&kvm->irq_lock); | |
201 | irq_source_id = find_first_zero_bit(bitmap, | |
5550af4d | 202 | sizeof(kvm->arch.irq_sources_bitmap)); |
61552367 | 203 | |
5550af4d SY |
204 | if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
205 | printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); | |
61552367 MM |
206 | return -EFAULT; |
207 | } | |
208 | ||
209 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); | |
210 | set_bit(irq_source_id, bitmap); | |
fa40a821 | 211 | mutex_unlock(&kvm->irq_lock); |
61552367 | 212 | |
5550af4d SY |
213 | return irq_source_id; |
214 | } | |
215 | ||
216 | void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) | |
217 | { | |
218 | int i; | |
219 | ||
61552367 MM |
220 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); |
221 | ||
fa40a821 | 222 | mutex_lock(&kvm->irq_lock); |
61552367 | 223 | if (irq_source_id < 0 || |
5550af4d SY |
224 | irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
225 | printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); | |
226 | return; | |
227 | } | |
228 | for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) | |
229 | clear_bit(irq_source_id, &kvm->arch.irq_states[i]); | |
230 | clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); | |
fa40a821 | 231 | mutex_unlock(&kvm->irq_lock); |
5550af4d | 232 | } |
75858a84 AK |
233 | |
234 | void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, | |
235 | struct kvm_irq_mask_notifier *kimn) | |
236 | { | |
fa40a821 | 237 | mutex_lock(&kvm->irq_lock); |
75858a84 AK |
238 | kimn->irq = irq; |
239 | hlist_add_head(&kimn->link, &kvm->mask_notifier_list); | |
fa40a821 | 240 | mutex_unlock(&kvm->irq_lock); |
75858a84 AK |
241 | } |
242 | ||
243 | void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, | |
244 | struct kvm_irq_mask_notifier *kimn) | |
245 | { | |
fa40a821 | 246 | mutex_lock(&kvm->irq_lock); |
75858a84 | 247 | hlist_del(&kimn->link); |
fa40a821 | 248 | mutex_unlock(&kvm->irq_lock); |
75858a84 AK |
249 | } |
250 | ||
251 | void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask) | |
252 | { | |
253 | struct kvm_irq_mask_notifier *kimn; | |
254 | struct hlist_node *n; | |
255 | ||
fa40a821 MT |
256 | WARN_ON(!mutex_is_locked(&kvm->irq_lock)); |
257 | ||
75858a84 AK |
258 | hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link) |
259 | if (kimn->irq == irq) | |
260 | kimn->func(kimn, mask); | |
261 | } | |
262 | ||
399ec807 AK |
263 | static void __kvm_free_irq_routing(struct list_head *irq_routing) |
264 | { | |
265 | struct kvm_kernel_irq_routing_entry *e, *n; | |
266 | ||
267 | list_for_each_entry_safe(e, n, irq_routing, link) | |
268 | kfree(e); | |
269 | } | |
270 | ||
271 | void kvm_free_irq_routing(struct kvm *kvm) | |
272 | { | |
fa40a821 | 273 | mutex_lock(&kvm->irq_lock); |
399ec807 | 274 | __kvm_free_irq_routing(&kvm->irq_routing); |
fa40a821 | 275 | mutex_unlock(&kvm->irq_lock); |
399ec807 AK |
276 | } |
277 | ||
cded19f3 HE |
278 | static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, |
279 | const struct kvm_irq_routing_entry *ue) | |
399ec807 AK |
280 | { |
281 | int r = -EINVAL; | |
282 | int delta; | |
283 | ||
284 | e->gsi = ue->gsi; | |
5116d8f6 | 285 | e->type = ue->type; |
399ec807 AK |
286 | switch (ue->type) { |
287 | case KVM_IRQ_ROUTING_IRQCHIP: | |
288 | delta = 0; | |
289 | switch (ue->u.irqchip.irqchip) { | |
290 | case KVM_IRQCHIP_PIC_MASTER: | |
291 | e->set = kvm_set_pic_irq; | |
292 | break; | |
293 | case KVM_IRQCHIP_PIC_SLAVE: | |
4925663a | 294 | e->set = kvm_set_pic_irq; |
399ec807 AK |
295 | delta = 8; |
296 | break; | |
297 | case KVM_IRQCHIP_IOAPIC: | |
efbc100c | 298 | e->set = kvm_set_ioapic_irq; |
399ec807 AK |
299 | break; |
300 | default: | |
301 | goto out; | |
302 | } | |
303 | e->irqchip.irqchip = ue->u.irqchip.irqchip; | |
304 | e->irqchip.pin = ue->u.irqchip.pin + delta; | |
305 | break; | |
79950e10 SY |
306 | case KVM_IRQ_ROUTING_MSI: |
307 | e->set = kvm_set_msi; | |
308 | e->msi.address_lo = ue->u.msi.address_lo; | |
309 | e->msi.address_hi = ue->u.msi.address_hi; | |
310 | e->msi.data = ue->u.msi.data; | |
311 | break; | |
399ec807 AK |
312 | default: |
313 | goto out; | |
314 | } | |
315 | r = 0; | |
316 | out: | |
317 | return r; | |
318 | } | |
319 | ||
320 | ||
321 | int kvm_set_irq_routing(struct kvm *kvm, | |
322 | const struct kvm_irq_routing_entry *ue, | |
323 | unsigned nr, | |
324 | unsigned flags) | |
325 | { | |
326 | struct list_head irq_list = LIST_HEAD_INIT(irq_list); | |
327 | struct list_head tmp = LIST_HEAD_INIT(tmp); | |
328 | struct kvm_kernel_irq_routing_entry *e = NULL; | |
329 | unsigned i; | |
330 | int r; | |
331 | ||
332 | for (i = 0; i < nr; ++i) { | |
333 | r = -EINVAL; | |
334 | if (ue->gsi >= KVM_MAX_IRQ_ROUTES) | |
335 | goto out; | |
336 | if (ue->flags) | |
337 | goto out; | |
338 | r = -ENOMEM; | |
339 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
340 | if (!e) | |
341 | goto out; | |
342 | r = setup_routing_entry(e, ue); | |
343 | if (r) | |
344 | goto out; | |
345 | ++ue; | |
346 | list_add(&e->link, &irq_list); | |
347 | e = NULL; | |
348 | } | |
349 | ||
fa40a821 | 350 | mutex_lock(&kvm->irq_lock); |
399ec807 AK |
351 | list_splice(&kvm->irq_routing, &tmp); |
352 | INIT_LIST_HEAD(&kvm->irq_routing); | |
353 | list_splice(&irq_list, &kvm->irq_routing); | |
354 | INIT_LIST_HEAD(&irq_list); | |
355 | list_splice(&tmp, &irq_list); | |
fa40a821 | 356 | mutex_unlock(&kvm->irq_lock); |
399ec807 AK |
357 | |
358 | r = 0; | |
359 | ||
360 | out: | |
361 | kfree(e); | |
362 | __kvm_free_irq_routing(&irq_list); | |
363 | return r; | |
364 | } | |
365 | ||
366 | #define IOAPIC_ROUTING_ENTRY(irq) \ | |
367 | { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ | |
368 | .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) } | |
369 | #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq) | |
370 | ||
371 | #ifdef CONFIG_X86 | |
399ec807 AK |
372 | # define PIC_ROUTING_ENTRY(irq) \ |
373 | { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ | |
374 | .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 } | |
375 | # define ROUTING_ENTRY2(irq) \ | |
376 | IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq) | |
377 | #else | |
378 | # define ROUTING_ENTRY2(irq) \ | |
379 | IOAPIC_ROUTING_ENTRY(irq) | |
380 | #endif | |
381 | ||
382 | static const struct kvm_irq_routing_entry default_routing[] = { | |
383 | ROUTING_ENTRY2(0), ROUTING_ENTRY2(1), | |
384 | ROUTING_ENTRY2(2), ROUTING_ENTRY2(3), | |
385 | ROUTING_ENTRY2(4), ROUTING_ENTRY2(5), | |
386 | ROUTING_ENTRY2(6), ROUTING_ENTRY2(7), | |
387 | ROUTING_ENTRY2(8), ROUTING_ENTRY2(9), | |
388 | ROUTING_ENTRY2(10), ROUTING_ENTRY2(11), | |
389 | ROUTING_ENTRY2(12), ROUTING_ENTRY2(13), | |
390 | ROUTING_ENTRY2(14), ROUTING_ENTRY2(15), | |
391 | ROUTING_ENTRY1(16), ROUTING_ENTRY1(17), | |
392 | ROUTING_ENTRY1(18), ROUTING_ENTRY1(19), | |
393 | ROUTING_ENTRY1(20), ROUTING_ENTRY1(21), | |
394 | ROUTING_ENTRY1(22), ROUTING_ENTRY1(23), | |
395 | #ifdef CONFIG_IA64 | |
396 | ROUTING_ENTRY1(24), ROUTING_ENTRY1(25), | |
397 | ROUTING_ENTRY1(26), ROUTING_ENTRY1(27), | |
398 | ROUTING_ENTRY1(28), ROUTING_ENTRY1(29), | |
399 | ROUTING_ENTRY1(30), ROUTING_ENTRY1(31), | |
400 | ROUTING_ENTRY1(32), ROUTING_ENTRY1(33), | |
401 | ROUTING_ENTRY1(34), ROUTING_ENTRY1(35), | |
402 | ROUTING_ENTRY1(36), ROUTING_ENTRY1(37), | |
403 | ROUTING_ENTRY1(38), ROUTING_ENTRY1(39), | |
404 | ROUTING_ENTRY1(40), ROUTING_ENTRY1(41), | |
405 | ROUTING_ENTRY1(42), ROUTING_ENTRY1(43), | |
406 | ROUTING_ENTRY1(44), ROUTING_ENTRY1(45), | |
407 | ROUTING_ENTRY1(46), ROUTING_ENTRY1(47), | |
408 | #endif | |
409 | }; | |
410 | ||
411 | int kvm_setup_default_irq_routing(struct kvm *kvm) | |
412 | { | |
413 | return kvm_set_irq_routing(kvm, default_routing, | |
414 | ARRAY_SIZE(default_routing), 0); | |
415 | } |