blob: ddc17f0e2f353f86c9ff831354a26bb9f76a76f7 [file] [log] [blame]
Xiantao Zhang3de42dc2008-10-06 13:48:45 +08001/*
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>
Sheng Yang79950e12009-02-10 13:57:06 +080023
Sheng Yang79950e12009-02-10 13:57:06 +080024#include <asm/msidef.h>
Gleb Natapov58c2dde2009-03-05 16:35:04 +020025#ifdef CONFIG_IA64
26#include <asm/iosapic.h>
27#endif
Sheng Yang79950e12009-02-10 13:57:06 +080028
Xiantao Zhang3de42dc2008-10-06 13:48:45 +080029#include "irq.h"
30
31#include "ioapic.h"
32
Gleb Natapov49256632009-02-04 17:28:14 +020033static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
34 struct kvm *kvm, int level)
Avi Kivity399ec802008-11-19 13:58:46 +020035{
36#ifdef CONFIG_X86
Gleb Natapov49256632009-02-04 17:28:14 +020037 return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
38#else
39 return -1;
Avi Kivity399ec802008-11-19 13:58:46 +020040#endif
41}
42
Gleb Natapov49256632009-02-04 17:28:14 +020043static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
44 struct kvm *kvm, int level)
Avi Kivity399ec802008-11-19 13:58:46 +020045{
Gleb Natapov49256632009-02-04 17:28:14 +020046 return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
Avi Kivity399ec802008-11-19 13:58:46 +020047}
48
Gleb Natapov58c2dde2009-03-05 16:35:04 +020049inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
Sheng Yang116191b2009-02-11 16:03:37 +080050{
Gleb Natapov58c2dde2009-03-05 16:35:04 +020051#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}
Sheng Yang116191b2009-02-11 16:03:37 +080058
Gleb Natapov58c2dde2009-03-05 16:35:04 +020059int 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))
Gleb Natapov343f94f2009-03-05 16:34:54 +020067 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
68
Gleb Natapov343f94f2009-03-05 16:34:54 +020069 for (i = 0; i < KVM_MAX_VCPUS; i++) {
70 vcpu = kvm->vcpus[i];
Sheng Yang74a3a8f2009-03-04 13:33:02 +080071
Gleb Natapov343f94f2009-03-05 16:34:54 +020072 if (!vcpu || !kvm_apic_present(vcpu))
73 continue;
Sheng Yang74a3a8f2009-03-04 13:33:02 +080074
Gleb Natapov58c2dde2009-03-05 16:35:04 +020075 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
76 irq->dest_id, irq->dest_mode))
Gleb Natapov343f94f2009-03-05 16:34:54 +020077 continue;
78
Gleb Natapov58c2dde2009-03-05 16:35:04 +020079 if (!kvm_is_dm_lowest_prio(irq)) {
80 if (r < 0)
81 r = 0;
82 r += kvm_apic_set_irq(vcpu, irq);
Gleb Natapove1035712009-03-05 16:34:59 +020083 } else {
Gleb Natapov58c2dde2009-03-05 16:35:04 +020084 if (!lowest)
85 lowest = vcpu;
86 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
87 lowest = vcpu;
Gleb Natapove1035712009-03-05 16:34:59 +020088 }
Gleb Natapov343f94f2009-03-05 16:34:54 +020089 }
90
Gleb Natapov58c2dde2009-03-05 16:35:04 +020091 if (lowest)
92 r = kvm_apic_set_irq(lowest, irq);
93
94 return r;
Sheng Yang116191b2009-02-11 16:03:37 +080095}
96
Gleb Natapov49256632009-02-04 17:28:14 +020097static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
98 struct kvm *kvm, int level)
Sheng Yang79950e12009-02-10 13:57:06 +080099{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200100 struct kvm_lapic_irq irq;
Sheng Yang79950e12009-02-10 13:57:06 +0800101
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200102 irq.dest_id = (e->msi.address_lo &
Sheng Yang116191b2009-02-11 16:03:37 +0800103 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200104 irq.vector = (e->msi.data &
Sheng Yang116191b2009-02-11 16:03:37 +0800105 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200106 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;
Sheng Yang116191b2009-02-11 16:03:37 +0800111
112 /* TODO Deal with RH bit of MSI message address */
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200113 return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
Sheng Yang79950e12009-02-10 13:57:06 +0800114}
115
Gleb Natapov49256632009-02-04 17:28:14 +0200116/* 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 */
122int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800123{
Avi Kivity399ec802008-11-19 13:58:46 +0200124 struct kvm_kernel_irq_routing_entry *e;
Sheng Yang79950e12009-02-10 13:57:06 +0800125 unsigned long *irq_state, sig_level;
Gleb Natapov49256632009-02-04 17:28:14 +0200126 int ret = -1;
Sheng Yang5550af42008-10-15 20:15:06 +0800127
Sheng Yang79950e12009-02-10 13:57:06 +0800128 if (irq < KVM_IOAPIC_NUM_PINS) {
129 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
130
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;
Sheng Yang5550af42008-10-15 20:15:06 +0800139
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800140 /* 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 */
Avi Kivity399ec802008-11-19 13:58:46 +0200144 list_for_each_entry(e, &kvm->irq_routing, link)
Gleb Natapov49256632009-02-04 17:28:14 +0200145 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;
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800153}
154
Marcelo Tosatti44882ee2009-01-27 15:12:38 -0200155void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800156{
Marcelo Tosatti44882ee2009-01-27 15:12:38 -0200157 struct kvm_kernel_irq_routing_entry *e;
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800158 struct kvm_irq_ack_notifier *kian;
159 struct hlist_node *n;
Marcelo Tosatti44882ee2009-01-27 15:12:38 -0200160 unsigned gsi = pin;
161
162 list_for_each_entry(e, &kvm->irq_routing, link)
Michael S. Tsirkin5116d8f2009-07-26 17:10:01 +0300163 if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
164 e->irqchip.irqchip == irqchip &&
Marcelo Tosatti44882ee2009-01-27 15:12:38 -0200165 e->irqchip.pin == pin) {
166 gsi = e->gsi;
167 break;
168 }
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800169
170 hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
171 if (kian->gsi == gsi)
172 kian->irq_acked(kian);
173}
174
175void kvm_register_irq_ack_notifier(struct kvm *kvm,
176 struct kvm_irq_ack_notifier *kian)
177{
178 hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
179}
180
Sheng Yange19e30e2008-10-20 16:07:10 +0800181void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800182{
Mark McLoughlinfdd897e2008-12-01 13:57:46 +0000183 hlist_del_init(&kian->link);
Xiantao Zhang3de42dc2008-10-06 13:48:45 +0800184}
Sheng Yang5550af42008-10-15 20:15:06 +0800185
186/* The caller must hold kvm->lock mutex */
187int kvm_request_irq_source_id(struct kvm *kvm)
188{
189 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
190 int irq_source_id = find_first_zero_bit(bitmap,
191 sizeof(kvm->arch.irq_sources_bitmap));
Mark McLoughlin61552362008-12-01 13:57:48 +0000192
Sheng Yang5550af42008-10-15 20:15:06 +0800193 if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
194 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
Mark McLoughlin61552362008-12-01 13:57:48 +0000195 return -EFAULT;
196 }
197
198 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
199 set_bit(irq_source_id, bitmap);
200
Sheng Yang5550af42008-10-15 20:15:06 +0800201 return irq_source_id;
202}
203
204void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
205{
206 int i;
207
Mark McLoughlin61552362008-12-01 13:57:48 +0000208 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
209
210 if (irq_source_id < 0 ||
Sheng Yang5550af42008-10-15 20:15:06 +0800211 irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
212 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
213 return;
214 }
215 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
216 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
217 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
218}
Avi Kivity75858a82009-01-04 17:10:50 +0200219
220void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
221 struct kvm_irq_mask_notifier *kimn)
222{
223 kimn->irq = irq;
224 hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
225}
226
227void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
228 struct kvm_irq_mask_notifier *kimn)
229{
230 hlist_del(&kimn->link);
231}
232
233void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
234{
235 struct kvm_irq_mask_notifier *kimn;
236 struct hlist_node *n;
237
238 hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
239 if (kimn->irq == irq)
240 kimn->func(kimn, mask);
241}
242
Avi Kivity399ec802008-11-19 13:58:46 +0200243static void __kvm_free_irq_routing(struct list_head *irq_routing)
244{
245 struct kvm_kernel_irq_routing_entry *e, *n;
246
247 list_for_each_entry_safe(e, n, irq_routing, link)
248 kfree(e);
249}
250
251void kvm_free_irq_routing(struct kvm *kvm)
252{
253 __kvm_free_irq_routing(&kvm->irq_routing);
254}
255
Hannes Edercded19f2009-02-21 02:19:13 +0100256static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
257 const struct kvm_irq_routing_entry *ue)
Avi Kivity399ec802008-11-19 13:58:46 +0200258{
259 int r = -EINVAL;
260 int delta;
261
262 e->gsi = ue->gsi;
Michael S. Tsirkin5116d8f2009-07-26 17:10:01 +0300263 e->type = ue->type;
Avi Kivity399ec802008-11-19 13:58:46 +0200264 switch (ue->type) {
265 case KVM_IRQ_ROUTING_IRQCHIP:
266 delta = 0;
267 switch (ue->u.irqchip.irqchip) {
268 case KVM_IRQCHIP_PIC_MASTER:
269 e->set = kvm_set_pic_irq;
270 break;
271 case KVM_IRQCHIP_PIC_SLAVE:
Gleb Natapov49256632009-02-04 17:28:14 +0200272 e->set = kvm_set_pic_irq;
Avi Kivity399ec802008-11-19 13:58:46 +0200273 delta = 8;
274 break;
275 case KVM_IRQCHIP_IOAPIC:
Chris Wrightefbc1002009-05-01 14:15:43 -0700276 e->set = kvm_set_ioapic_irq;
Avi Kivity399ec802008-11-19 13:58:46 +0200277 break;
278 default:
279 goto out;
280 }
281 e->irqchip.irqchip = ue->u.irqchip.irqchip;
282 e->irqchip.pin = ue->u.irqchip.pin + delta;
283 break;
Sheng Yang79950e12009-02-10 13:57:06 +0800284 case KVM_IRQ_ROUTING_MSI:
285 e->set = kvm_set_msi;
286 e->msi.address_lo = ue->u.msi.address_lo;
287 e->msi.address_hi = ue->u.msi.address_hi;
288 e->msi.data = ue->u.msi.data;
289 break;
Avi Kivity399ec802008-11-19 13:58:46 +0200290 default:
291 goto out;
292 }
293 r = 0;
294out:
295 return r;
296}
297
298
299int kvm_set_irq_routing(struct kvm *kvm,
300 const struct kvm_irq_routing_entry *ue,
301 unsigned nr,
302 unsigned flags)
303{
304 struct list_head irq_list = LIST_HEAD_INIT(irq_list);
305 struct list_head tmp = LIST_HEAD_INIT(tmp);
306 struct kvm_kernel_irq_routing_entry *e = NULL;
307 unsigned i;
308 int r;
309
310 for (i = 0; i < nr; ++i) {
311 r = -EINVAL;
312 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
313 goto out;
314 if (ue->flags)
315 goto out;
316 r = -ENOMEM;
317 e = kzalloc(sizeof(*e), GFP_KERNEL);
318 if (!e)
319 goto out;
320 r = setup_routing_entry(e, ue);
321 if (r)
322 goto out;
323 ++ue;
324 list_add(&e->link, &irq_list);
325 e = NULL;
326 }
327
328 mutex_lock(&kvm->lock);
329 list_splice(&kvm->irq_routing, &tmp);
330 INIT_LIST_HEAD(&kvm->irq_routing);
331 list_splice(&irq_list, &kvm->irq_routing);
332 INIT_LIST_HEAD(&irq_list);
333 list_splice(&tmp, &irq_list);
334 mutex_unlock(&kvm->lock);
335
336 r = 0;
337
338out:
339 kfree(e);
340 __kvm_free_irq_routing(&irq_list);
341 return r;
342}
343
344#define IOAPIC_ROUTING_ENTRY(irq) \
345 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
346 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
347#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
348
349#ifdef CONFIG_X86
Avi Kivity399ec802008-11-19 13:58:46 +0200350# define PIC_ROUTING_ENTRY(irq) \
351 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
352 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
353# define ROUTING_ENTRY2(irq) \
354 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
355#else
356# define ROUTING_ENTRY2(irq) \
357 IOAPIC_ROUTING_ENTRY(irq)
358#endif
359
360static const struct kvm_irq_routing_entry default_routing[] = {
361 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
362 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
363 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
364 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
365 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
366 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
367 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
368 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
369 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
370 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
371 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
372 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
373#ifdef CONFIG_IA64
374 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
375 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
376 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
377 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
378 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
379 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
380 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
381 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
382 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
383 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
384 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
385 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
386#endif
387};
388
389int kvm_setup_default_irq_routing(struct kvm *kvm)
390{
391 return kvm_set_irq_routing(kvm, default_routing,
392 ARRAY_SIZE(default_routing), 0);
393}