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 | ||
65 | if (irq->dest_mode == 0 && irq->dest_id == 0xff && | |
66 | kvm_is_dm_lowest_prio(irq)) | |
343f94fe GN |
67 | printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); |
68 | ||
343f94fe GN |
69 | for (i = 0; i < KVM_MAX_VCPUS; i++) { |
70 | vcpu = kvm->vcpus[i]; | |
74a3a8f1 | 71 | |
343f94fe GN |
72 | if (!vcpu || !kvm_apic_present(vcpu)) |
73 | continue; | |
74 | ||
58c2dde1 GN |
75 | if (!kvm_apic_match_dest(vcpu, src, irq->shorthand, |
76 | irq->dest_id, irq->dest_mode)) | |
343f94fe GN |
77 | continue; |
78 | ||
58c2dde1 GN |
79 | if (!kvm_is_dm_lowest_prio(irq)) { |
80 | if (r < 0) | |
81 | r = 0; | |
82 | r += kvm_apic_set_irq(vcpu, irq); | |
e1035715 | 83 | } else { |
58c2dde1 GN |
84 | if (!lowest) |
85 | lowest = vcpu; | |
86 | else if (kvm_apic_compare_prio(vcpu, lowest) < 0) | |
87 | lowest = vcpu; | |
e1035715 | 88 | } |
343f94fe GN |
89 | } |
90 | ||
58c2dde1 GN |
91 | if (lowest) |
92 | r = kvm_apic_set_irq(lowest, irq); | |
93 | ||
94 | return r; | |
116191b6 SY |
95 | } |
96 | ||
4925663a GN |
97 | static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, |
98 | struct kvm *kvm, int level) | |
79950e10 | 99 | { |
58c2dde1 | 100 | struct kvm_lapic_irq irq; |
79950e10 | 101 | |
58c2dde1 | 102 | irq.dest_id = (e->msi.address_lo & |
116191b6 | 103 | MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; |
58c2dde1 | 104 | irq.vector = (e->msi.data & |
116191b6 | 105 | MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT; |
58c2dde1 GN |
106 | irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo; |
107 | irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data; | |
108 | irq.delivery_mode = e->msi.data & 0x700; | |
109 | irq.level = 1; | |
110 | irq.shorthand = 0; | |
116191b6 SY |
111 | |
112 | /* TODO Deal with RH bit of MSI message address */ | |
58c2dde1 | 113 | return kvm_irq_delivery_to_apic(kvm, NULL, &irq); |
79950e10 SY |
114 | } |
115 | ||
4925663a GN |
116 | /* This should be called with the kvm->lock mutex held |
117 | * Return value: | |
118 | * < 0 Interrupt was ignored (masked or not delivered for other reasons) | |
119 | * = 0 Interrupt was coalesced (previous irq is still pending) | |
120 | * > 0 Number of CPUs interrupt was delivered to | |
121 | */ | |
122 | int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) | |
3de42dc0 | 123 | { |
399ec807 | 124 | struct kvm_kernel_irq_routing_entry *e; |
79950e10 | 125 | unsigned long *irq_state, sig_level; |
4925663a | 126 | int ret = -1; |
79950e10 SY |
127 | |
128 | if (irq < KVM_IOAPIC_NUM_PINS) { | |
129 | irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; | |
5550af4d | 130 | |
79950e10 SY |
131 | /* Logical OR for level trig interrupt */ |
132 | if (level) | |
133 | set_bit(irq_source_id, irq_state); | |
134 | else | |
135 | clear_bit(irq_source_id, irq_state); | |
136 | sig_level = !!(*irq_state); | |
137 | } else /* Deal with MSI/MSI-X */ | |
138 | sig_level = 1; | |
5550af4d | 139 | |
3de42dc0 XZ |
140 | /* Not possible to detect if the guest uses the PIC or the |
141 | * IOAPIC. So set the bit in both. The guest will ignore | |
142 | * writes to the unused one. | |
143 | */ | |
399ec807 | 144 | list_for_each_entry(e, &kvm->irq_routing, link) |
4925663a GN |
145 | if (e->gsi == irq) { |
146 | int r = e->set(e, kvm, sig_level); | |
147 | if (r < 0) | |
148 | continue; | |
149 | ||
150 | ret = r + ((ret < 0) ? 0 : ret); | |
151 | } | |
152 | return ret; | |
3de42dc0 XZ |
153 | } |
154 | ||
44882eed | 155 | void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) |
3de42dc0 | 156 | { |
44882eed | 157 | struct kvm_kernel_irq_routing_entry *e; |
3de42dc0 XZ |
158 | struct kvm_irq_ack_notifier *kian; |
159 | struct hlist_node *n; | |
44882eed MT |
160 | unsigned gsi = pin; |
161 | ||
162 | list_for_each_entry(e, &kvm->irq_routing, link) | |
163 | if (e->irqchip.irqchip == irqchip && | |
164 | e->irqchip.pin == pin) { | |
165 | gsi = e->gsi; | |
166 | break; | |
167 | } | |
3de42dc0 XZ |
168 | |
169 | hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link) | |
170 | if (kian->gsi == gsi) | |
171 | kian->irq_acked(kian); | |
172 | } | |
173 | ||
174 | void kvm_register_irq_ack_notifier(struct kvm *kvm, | |
175 | struct kvm_irq_ack_notifier *kian) | |
176 | { | |
177 | hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list); | |
178 | } | |
179 | ||
e19e30ef | 180 | void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian) |
3de42dc0 | 181 | { |
fdd897e6 | 182 | hlist_del_init(&kian->link); |
3de42dc0 | 183 | } |
5550af4d SY |
184 | |
185 | /* The caller must hold kvm->lock mutex */ | |
186 | int kvm_request_irq_source_id(struct kvm *kvm) | |
187 | { | |
188 | unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; | |
189 | int irq_source_id = find_first_zero_bit(bitmap, | |
190 | sizeof(kvm->arch.irq_sources_bitmap)); | |
61552367 | 191 | |
5550af4d SY |
192 | if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
193 | printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); | |
61552367 MM |
194 | return -EFAULT; |
195 | } | |
196 | ||
197 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); | |
198 | set_bit(irq_source_id, bitmap); | |
199 | ||
5550af4d SY |
200 | return irq_source_id; |
201 | } | |
202 | ||
203 | void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) | |
204 | { | |
205 | int i; | |
206 | ||
61552367 MM |
207 | ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); |
208 | ||
209 | if (irq_source_id < 0 || | |
5550af4d SY |
210 | irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
211 | printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); | |
212 | return; | |
213 | } | |
214 | for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) | |
215 | clear_bit(irq_source_id, &kvm->arch.irq_states[i]); | |
216 | clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); | |
217 | } | |
75858a84 AK |
218 | |
219 | void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, | |
220 | struct kvm_irq_mask_notifier *kimn) | |
221 | { | |
222 | kimn->irq = irq; | |
223 | hlist_add_head(&kimn->link, &kvm->mask_notifier_list); | |
224 | } | |
225 | ||
226 | void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, | |
227 | struct kvm_irq_mask_notifier *kimn) | |
228 | { | |
229 | hlist_del(&kimn->link); | |
230 | } | |
231 | ||
232 | void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask) | |
233 | { | |
234 | struct kvm_irq_mask_notifier *kimn; | |
235 | struct hlist_node *n; | |
236 | ||
237 | hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link) | |
238 | if (kimn->irq == irq) | |
239 | kimn->func(kimn, mask); | |
240 | } | |
241 | ||
399ec807 AK |
242 | static void __kvm_free_irq_routing(struct list_head *irq_routing) |
243 | { | |
244 | struct kvm_kernel_irq_routing_entry *e, *n; | |
245 | ||
246 | list_for_each_entry_safe(e, n, irq_routing, link) | |
247 | kfree(e); | |
248 | } | |
249 | ||
250 | void kvm_free_irq_routing(struct kvm *kvm) | |
251 | { | |
252 | __kvm_free_irq_routing(&kvm->irq_routing); | |
253 | } | |
254 | ||
cded19f3 HE |
255 | static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, |
256 | const struct kvm_irq_routing_entry *ue) | |
399ec807 AK |
257 | { |
258 | int r = -EINVAL; | |
259 | int delta; | |
260 | ||
261 | e->gsi = ue->gsi; | |
262 | switch (ue->type) { | |
263 | case KVM_IRQ_ROUTING_IRQCHIP: | |
264 | delta = 0; | |
265 | switch (ue->u.irqchip.irqchip) { | |
266 | case KVM_IRQCHIP_PIC_MASTER: | |
267 | e->set = kvm_set_pic_irq; | |
268 | break; | |
269 | case KVM_IRQCHIP_PIC_SLAVE: | |
4925663a | 270 | e->set = kvm_set_pic_irq; |
399ec807 AK |
271 | delta = 8; |
272 | break; | |
273 | case KVM_IRQCHIP_IOAPIC: | |
274 | e->set = kvm_set_ioapic_irq; | |
275 | break; | |
276 | default: | |
277 | goto out; | |
278 | } | |
279 | e->irqchip.irqchip = ue->u.irqchip.irqchip; | |
280 | e->irqchip.pin = ue->u.irqchip.pin + delta; | |
281 | break; | |
79950e10 SY |
282 | case KVM_IRQ_ROUTING_MSI: |
283 | e->set = kvm_set_msi; | |
284 | e->msi.address_lo = ue->u.msi.address_lo; | |
285 | e->msi.address_hi = ue->u.msi.address_hi; | |
286 | e->msi.data = ue->u.msi.data; | |
287 | break; | |
399ec807 AK |
288 | default: |
289 | goto out; | |
290 | } | |
291 | r = 0; | |
292 | out: | |
293 | return r; | |
294 | } | |
295 | ||
296 | ||
297 | int kvm_set_irq_routing(struct kvm *kvm, | |
298 | const struct kvm_irq_routing_entry *ue, | |
299 | unsigned nr, | |
300 | unsigned flags) | |
301 | { | |
302 | struct list_head irq_list = LIST_HEAD_INIT(irq_list); | |
303 | struct list_head tmp = LIST_HEAD_INIT(tmp); | |
304 | struct kvm_kernel_irq_routing_entry *e = NULL; | |
305 | unsigned i; | |
306 | int r; | |
307 | ||
308 | for (i = 0; i < nr; ++i) { | |
309 | r = -EINVAL; | |
310 | if (ue->gsi >= KVM_MAX_IRQ_ROUTES) | |
311 | goto out; | |
312 | if (ue->flags) | |
313 | goto out; | |
314 | r = -ENOMEM; | |
315 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
316 | if (!e) | |
317 | goto out; | |
318 | r = setup_routing_entry(e, ue); | |
319 | if (r) | |
320 | goto out; | |
321 | ++ue; | |
322 | list_add(&e->link, &irq_list); | |
323 | e = NULL; | |
324 | } | |
325 | ||
326 | mutex_lock(&kvm->lock); | |
327 | list_splice(&kvm->irq_routing, &tmp); | |
328 | INIT_LIST_HEAD(&kvm->irq_routing); | |
329 | list_splice(&irq_list, &kvm->irq_routing); | |
330 | INIT_LIST_HEAD(&irq_list); | |
331 | list_splice(&tmp, &irq_list); | |
332 | mutex_unlock(&kvm->lock); | |
333 | ||
334 | r = 0; | |
335 | ||
336 | out: | |
337 | kfree(e); | |
338 | __kvm_free_irq_routing(&irq_list); | |
339 | return r; | |
340 | } | |
341 | ||
342 | #define IOAPIC_ROUTING_ENTRY(irq) \ | |
343 | { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ | |
344 | .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) } | |
345 | #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq) | |
346 | ||
347 | #ifdef CONFIG_X86 | |
399ec807 AK |
348 | # define PIC_ROUTING_ENTRY(irq) \ |
349 | { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ | |
350 | .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 } | |
351 | # define ROUTING_ENTRY2(irq) \ | |
352 | IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq) | |
353 | #else | |
354 | # define ROUTING_ENTRY2(irq) \ | |
355 | IOAPIC_ROUTING_ENTRY(irq) | |
356 | #endif | |
357 | ||
358 | static const struct kvm_irq_routing_entry default_routing[] = { | |
359 | ROUTING_ENTRY2(0), ROUTING_ENTRY2(1), | |
360 | ROUTING_ENTRY2(2), ROUTING_ENTRY2(3), | |
361 | ROUTING_ENTRY2(4), ROUTING_ENTRY2(5), | |
362 | ROUTING_ENTRY2(6), ROUTING_ENTRY2(7), | |
363 | ROUTING_ENTRY2(8), ROUTING_ENTRY2(9), | |
364 | ROUTING_ENTRY2(10), ROUTING_ENTRY2(11), | |
365 | ROUTING_ENTRY2(12), ROUTING_ENTRY2(13), | |
366 | ROUTING_ENTRY2(14), ROUTING_ENTRY2(15), | |
367 | ROUTING_ENTRY1(16), ROUTING_ENTRY1(17), | |
368 | ROUTING_ENTRY1(18), ROUTING_ENTRY1(19), | |
369 | ROUTING_ENTRY1(20), ROUTING_ENTRY1(21), | |
370 | ROUTING_ENTRY1(22), ROUTING_ENTRY1(23), | |
371 | #ifdef CONFIG_IA64 | |
372 | ROUTING_ENTRY1(24), ROUTING_ENTRY1(25), | |
373 | ROUTING_ENTRY1(26), ROUTING_ENTRY1(27), | |
374 | ROUTING_ENTRY1(28), ROUTING_ENTRY1(29), | |
375 | ROUTING_ENTRY1(30), ROUTING_ENTRY1(31), | |
376 | ROUTING_ENTRY1(32), ROUTING_ENTRY1(33), | |
377 | ROUTING_ENTRY1(34), ROUTING_ENTRY1(35), | |
378 | ROUTING_ENTRY1(36), ROUTING_ENTRY1(37), | |
379 | ROUTING_ENTRY1(38), ROUTING_ENTRY1(39), | |
380 | ROUTING_ENTRY1(40), ROUTING_ENTRY1(41), | |
381 | ROUTING_ENTRY1(42), ROUTING_ENTRY1(43), | |
382 | ROUTING_ENTRY1(44), ROUTING_ENTRY1(45), | |
383 | ROUTING_ENTRY1(46), ROUTING_ENTRY1(47), | |
384 | #endif | |
385 | }; | |
386 | ||
387 | int kvm_setup_default_irq_routing(struct kvm *kvm) | |
388 | { | |
389 | return kvm_set_irq_routing(kvm, default_routing, | |
390 | ARRAY_SIZE(default_routing), 0); | |
391 | } |