2 * irq_comm.c: Common API for in kernel interrupt controller
3 * Copyright (c) 2007, Intel Corporation.
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.
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
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.
18 * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
22 #include <linux/kvm_host.h>
24 #include <asm/msidef.h>
26 #include <asm/iosapic.h>
33 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
34 struct kvm *kvm, int level)
37 return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
43 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
44 struct kvm *kvm, int level)
46 return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
49 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
52 return irq->delivery_mode ==
53 (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
55 return irq->delivery_mode == APIC_DM_LOWEST;
59 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
60 struct kvm_lapic_irq *irq)
63 struct kvm_vcpu *vcpu, *lowest = NULL;
65 WARN_ON(!mutex_is_locked(&kvm->irq_lock));
67 if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
68 kvm_is_dm_lowest_prio(irq))
69 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
71 kvm_for_each_vcpu(i, vcpu, kvm) {
72 if (!kvm_apic_present(vcpu))
75 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
76 irq->dest_id, irq->dest_mode))
79 if (!kvm_is_dm_lowest_prio(irq)) {
82 r += kvm_apic_set_irq(vcpu, irq);
86 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
92 r = kvm_apic_set_irq(lowest, irq);
97 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
98 struct kvm *kvm, int level)
100 struct kvm_lapic_irq irq;
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;
112 /* TODO Deal with RH bit of MSI message address */
113 return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
116 /* This should be called with the kvm->irq_lock mutex held
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
122 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
124 struct kvm_kernel_irq_routing_entry *e;
125 unsigned long *irq_state, sig_level;
128 WARN_ON(!mutex_is_locked(&kvm->irq_lock));
130 if (irq < KVM_IOAPIC_NUM_PINS) {
131 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
133 /* Logical OR for level trig interrupt */
135 set_bit(irq_source_id, irq_state);
137 clear_bit(irq_source_id, irq_state);
138 sig_level = !!(*irq_state);
139 } else /* Deal with MSI/MSI-X */
142 /* Not possible to detect if the guest uses the PIC or the
143 * IOAPIC. So set the bit in both. The guest will ignore
144 * writes to the unused one.
146 list_for_each_entry(e, &kvm->irq_routing, link)
148 int r = e->set(e, kvm, sig_level);
152 ret = r + ((ret < 0) ? 0 : ret);
157 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
159 struct kvm_kernel_irq_routing_entry *e;
160 struct kvm_irq_ack_notifier *kian;
161 struct hlist_node *n;
164 list_for_each_entry(e, &kvm->irq_routing, link)
165 if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
166 e->irqchip.irqchip == irqchip &&
167 e->irqchip.pin == pin) {
172 hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
173 if (kian->gsi == gsi)
174 kian->irq_acked(kian);
177 void kvm_register_irq_ack_notifier(struct kvm *kvm,
178 struct kvm_irq_ack_notifier *kian)
180 mutex_lock(&kvm->irq_lock);
181 hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
182 mutex_unlock(&kvm->irq_lock);
185 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
186 struct kvm_irq_ack_notifier *kian)
188 mutex_lock(&kvm->irq_lock);
189 hlist_del_init(&kian->link);
190 mutex_unlock(&kvm->irq_lock);
193 int kvm_request_irq_source_id(struct kvm *kvm)
195 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
198 mutex_lock(&kvm->irq_lock);
199 irq_source_id = find_first_zero_bit(bitmap,
200 sizeof(kvm->arch.irq_sources_bitmap));
202 if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
203 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
207 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
208 set_bit(irq_source_id, bitmap);
209 mutex_unlock(&kvm->irq_lock);
211 return irq_source_id;
214 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
218 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
220 mutex_lock(&kvm->irq_lock);
221 if (irq_source_id < 0 ||
222 irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
223 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
226 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
227 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
228 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
229 mutex_unlock(&kvm->irq_lock);
232 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
233 struct kvm_irq_mask_notifier *kimn)
235 mutex_lock(&kvm->irq_lock);
237 hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
238 mutex_unlock(&kvm->irq_lock);
241 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
242 struct kvm_irq_mask_notifier *kimn)
244 mutex_lock(&kvm->irq_lock);
245 hlist_del(&kimn->link);
246 mutex_unlock(&kvm->irq_lock);
249 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
251 struct kvm_irq_mask_notifier *kimn;
252 struct hlist_node *n;
254 WARN_ON(!mutex_is_locked(&kvm->irq_lock));
256 hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
257 if (kimn->irq == irq)
258 kimn->func(kimn, mask);
261 static void __kvm_free_irq_routing(struct list_head *irq_routing)
263 struct kvm_kernel_irq_routing_entry *e, *n;
265 list_for_each_entry_safe(e, n, irq_routing, link)
269 void kvm_free_irq_routing(struct kvm *kvm)
271 mutex_lock(&kvm->irq_lock);
272 __kvm_free_irq_routing(&kvm->irq_routing);
273 mutex_unlock(&kvm->irq_lock);
276 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
277 const struct kvm_irq_routing_entry *ue)
285 case KVM_IRQ_ROUTING_IRQCHIP:
287 switch (ue->u.irqchip.irqchip) {
288 case KVM_IRQCHIP_PIC_MASTER:
289 e->set = kvm_set_pic_irq;
291 case KVM_IRQCHIP_PIC_SLAVE:
292 e->set = kvm_set_pic_irq;
295 case KVM_IRQCHIP_IOAPIC:
296 e->set = kvm_set_ioapic_irq;
301 e->irqchip.irqchip = ue->u.irqchip.irqchip;
302 e->irqchip.pin = ue->u.irqchip.pin + delta;
304 case KVM_IRQ_ROUTING_MSI:
305 e->set = kvm_set_msi;
306 e->msi.address_lo = ue->u.msi.address_lo;
307 e->msi.address_hi = ue->u.msi.address_hi;
308 e->msi.data = ue->u.msi.data;
319 int kvm_set_irq_routing(struct kvm *kvm,
320 const struct kvm_irq_routing_entry *ue,
324 struct list_head irq_list = LIST_HEAD_INIT(irq_list);
325 struct list_head tmp = LIST_HEAD_INIT(tmp);
326 struct kvm_kernel_irq_routing_entry *e = NULL;
330 for (i = 0; i < nr; ++i) {
332 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
337 e = kzalloc(sizeof(*e), GFP_KERNEL);
340 r = setup_routing_entry(e, ue);
344 list_add(&e->link, &irq_list);
348 mutex_lock(&kvm->irq_lock);
349 list_splice(&kvm->irq_routing, &tmp);
350 INIT_LIST_HEAD(&kvm->irq_routing);
351 list_splice(&irq_list, &kvm->irq_routing);
352 INIT_LIST_HEAD(&irq_list);
353 list_splice(&tmp, &irq_list);
354 mutex_unlock(&kvm->irq_lock);
360 __kvm_free_irq_routing(&irq_list);
364 #define IOAPIC_ROUTING_ENTRY(irq) \
365 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
366 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
367 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
370 # define PIC_ROUTING_ENTRY(irq) \
371 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
372 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
373 # define ROUTING_ENTRY2(irq) \
374 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
376 # define ROUTING_ENTRY2(irq) \
377 IOAPIC_ROUTING_ENTRY(irq)
380 static const struct kvm_irq_routing_entry default_routing[] = {
381 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
382 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
383 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
384 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
385 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
386 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
387 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
388 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
389 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
390 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
391 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
392 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
394 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
395 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
396 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
397 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
398 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
399 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
400 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
401 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
402 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
403 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
404 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
405 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
409 int kvm_setup_default_irq_routing(struct kvm *kvm)
411 return kvm_set_irq_routing(kvm, default_routing,
412 ARRAY_SIZE(default_routing), 0);