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
24 #include <asm/msidef.h>
25 #ifdef CONFIG_IA64
26 #include <asm/iosapic.h>
27 #endif
28
29 #include "irq.h"
30
31 #include "ioapic.h"
32
33 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
34 struct kvm *kvm, int level)
35 {
36 #ifdef CONFIG_X86
37 return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
38 #else
39 return -1;
40 #endif
41 }
42
43 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
44 struct kvm *kvm, int level)
45 {
46 return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
47 }
48
49 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
50 {
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 }
58
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))
67 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
68
69 for (i = 0; i < KVM_MAX_VCPUS; i++) {
70 vcpu = kvm->vcpus[i];
71
72 if (!vcpu || !kvm_apic_present(vcpu))
73 continue;
74
75 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
76 irq->dest_id, irq->dest_mode))
77 continue;
78
79 if (!kvm_is_dm_lowest_prio(irq)) {
80 if (r < 0)
81 r = 0;
82 r += kvm_apic_set_irq(vcpu, irq);
83 } else {
84 if (!lowest)
85 lowest = vcpu;
86 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
87 lowest = vcpu;
88 }
89 }
90
91 if (lowest)
92 r = kvm_apic_set_irq(lowest, irq);
93
94 return r;
95 }
96
97 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
98 struct kvm *kvm, int level)
99 {
100 struct kvm_lapic_irq irq;
101
102 irq.dest_id = (e->msi.address_lo &
103 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
104 irq.vector = (e->msi.data &
105 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
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;
111
112 /* TODO Deal with RH bit of MSI message address */
113 return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
114 }
115
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)
123 {
124 struct kvm_kernel_irq_routing_entry *e;
125 unsigned long *irq_state, sig_level;
126 int ret = -1;
127
128 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;
139
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 */
144 list_for_each_entry(e, &kvm->irq_routing, link)
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;
153 }
154
155 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
156 {
157 struct kvm_kernel_irq_routing_entry *e;
158 struct kvm_irq_ack_notifier *kian;
159 struct hlist_node *n;
160 unsigned gsi = pin;
161
162 list_for_each_entry(e, &kvm->irq_routing, link)
163 if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
164 e->irqchip.irqchip == irqchip &&
165 e->irqchip.pin == pin) {
166 gsi = e->gsi;
167 break;
168 }
169
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
175 void 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
181 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
182 {
183 hlist_del_init(&kian->link);
184 }
185
186 /* The caller must hold kvm->lock mutex */
187 int 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));
192
193 if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
194 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
195 return -EFAULT;
196 }
197
198 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
199 set_bit(irq_source_id, bitmap);
200
201 return irq_source_id;
202 }
203
204 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
205 {
206 int i;
207
208 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
209
210 if (irq_source_id < 0 ||
211 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 }
219
220 void 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
227 void 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
233 void 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
243 static 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
251 void kvm_free_irq_routing(struct kvm *kvm)
252 {
253 __kvm_free_irq_routing(&kvm->irq_routing);
254 }
255
256 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
257 const struct kvm_irq_routing_entry *ue)
258 {
259 int r = -EINVAL;
260 int delta;
261
262 e->gsi = ue->gsi;
263 e->type = ue->type;
264 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:
272 e->set = kvm_set_pic_irq;
273 delta = 8;
274 break;
275 case KVM_IRQCHIP_IOAPIC:
276 e->set = kvm_set_ioapic_irq;
277 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;
284 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;
290 default:
291 goto out;
292 }
293 r = 0;
294 out:
295 return r;
296 }
297
298
299 int 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
338 out:
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
350 # 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
360 static 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
389 int 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 }
394
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