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>
25 #include <asm/msidef.h>
32 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
33 struct kvm *kvm, int level)
36 return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
42 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
43 struct kvm *kvm, int level)
45 return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
48 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
49 struct kvm *kvm, int level)
52 struct kvm_vcpu *vcpu;
53 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
54 int dest_id = (e->msi.address_lo & MSI_ADDR_DEST_ID_MASK)
55 >> MSI_ADDR_DEST_ID_SHIFT;
56 int vector = (e->msi.data & MSI_DATA_VECTOR_MASK)
57 >> MSI_DATA_VECTOR_SHIFT;
58 int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
59 (unsigned long *)&e->msi.address_lo);
60 int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
61 (unsigned long *)&e->msi.data);
62 int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
63 (unsigned long *)&e->msi.data);
68 deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
70 /* IOAPIC delivery mode value is the same as MSI here */
71 switch (delivery_mode) {
72 case IOAPIC_LOWEST_PRIORITY:
73 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
76 kvm_apic_set_irq(vcpu, vector, trig_mode);
78 printk(KERN_INFO "kvm: null lowest priority vcpu!\n");
81 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
82 if (!(deliver_bitmask & (1 << vcpu_id)))
84 deliver_bitmask &= ~(1 << vcpu_id);
85 vcpu = ioapic->kvm->vcpus[vcpu_id];
87 kvm_apic_set_irq(vcpu, vector, trig_mode);
96 /* This should be called with the kvm->lock mutex held
98 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
99 * = 0 Interrupt was coalesced (previous irq is still pending)
100 * > 0 Number of CPUs interrupt was delivered to
102 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
104 struct kvm_kernel_irq_routing_entry *e;
105 unsigned long *irq_state, sig_level;
108 if (irq < KVM_IOAPIC_NUM_PINS) {
109 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
111 /* Logical OR for level trig interrupt */
113 set_bit(irq_source_id, irq_state);
115 clear_bit(irq_source_id, irq_state);
116 sig_level = !!(*irq_state);
117 } else /* Deal with MSI/MSI-X */
120 /* Not possible to detect if the guest uses the PIC or the
121 * IOAPIC. So set the bit in both. The guest will ignore
122 * writes to the unused one.
124 list_for_each_entry(e, &kvm->irq_routing, link)
126 int r = e->set(e, kvm, sig_level);
130 ret = r + ((ret < 0) ? 0 : ret);
135 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
137 struct kvm_kernel_irq_routing_entry *e;
138 struct kvm_irq_ack_notifier *kian;
139 struct hlist_node *n;
142 list_for_each_entry(e, &kvm->irq_routing, link)
143 if (e->irqchip.irqchip == irqchip &&
144 e->irqchip.pin == pin) {
149 hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
150 if (kian->gsi == gsi)
151 kian->irq_acked(kian);
154 void kvm_register_irq_ack_notifier(struct kvm *kvm,
155 struct kvm_irq_ack_notifier *kian)
157 hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
160 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
162 hlist_del_init(&kian->link);
165 /* The caller must hold kvm->lock mutex */
166 int kvm_request_irq_source_id(struct kvm *kvm)
168 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
169 int irq_source_id = find_first_zero_bit(bitmap,
170 sizeof(kvm->arch.irq_sources_bitmap));
172 if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
173 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
177 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
178 set_bit(irq_source_id, bitmap);
180 return irq_source_id;
183 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
187 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
189 if (irq_source_id < 0 ||
190 irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
191 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
194 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
195 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
196 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
199 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
200 struct kvm_irq_mask_notifier *kimn)
203 hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
206 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
207 struct kvm_irq_mask_notifier *kimn)
209 hlist_del(&kimn->link);
212 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
214 struct kvm_irq_mask_notifier *kimn;
215 struct hlist_node *n;
217 hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
218 if (kimn->irq == irq)
219 kimn->func(kimn, mask);
222 static void __kvm_free_irq_routing(struct list_head *irq_routing)
224 struct kvm_kernel_irq_routing_entry *e, *n;
226 list_for_each_entry_safe(e, n, irq_routing, link)
230 void kvm_free_irq_routing(struct kvm *kvm)
232 __kvm_free_irq_routing(&kvm->irq_routing);
235 int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
236 const struct kvm_irq_routing_entry *ue)
243 case KVM_IRQ_ROUTING_IRQCHIP:
245 switch (ue->u.irqchip.irqchip) {
246 case KVM_IRQCHIP_PIC_MASTER:
247 e->set = kvm_set_pic_irq;
249 case KVM_IRQCHIP_PIC_SLAVE:
250 e->set = kvm_set_pic_irq;
253 case KVM_IRQCHIP_IOAPIC:
254 e->set = kvm_set_ioapic_irq;
259 e->irqchip.irqchip = ue->u.irqchip.irqchip;
260 e->irqchip.pin = ue->u.irqchip.pin + delta;
262 case KVM_IRQ_ROUTING_MSI:
263 e->set = kvm_set_msi;
264 e->msi.address_lo = ue->u.msi.address_lo;
265 e->msi.address_hi = ue->u.msi.address_hi;
266 e->msi.data = ue->u.msi.data;
277 int kvm_set_irq_routing(struct kvm *kvm,
278 const struct kvm_irq_routing_entry *ue,
282 struct list_head irq_list = LIST_HEAD_INIT(irq_list);
283 struct list_head tmp = LIST_HEAD_INIT(tmp);
284 struct kvm_kernel_irq_routing_entry *e = NULL;
288 for (i = 0; i < nr; ++i) {
290 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
295 e = kzalloc(sizeof(*e), GFP_KERNEL);
298 r = setup_routing_entry(e, ue);
302 list_add(&e->link, &irq_list);
306 mutex_lock(&kvm->lock);
307 list_splice(&kvm->irq_routing, &tmp);
308 INIT_LIST_HEAD(&kvm->irq_routing);
309 list_splice(&irq_list, &kvm->irq_routing);
310 INIT_LIST_HEAD(&irq_list);
311 list_splice(&tmp, &irq_list);
312 mutex_unlock(&kvm->lock);
318 __kvm_free_irq_routing(&irq_list);
322 #define IOAPIC_ROUTING_ENTRY(irq) \
323 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
324 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
325 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
328 # define PIC_ROUTING_ENTRY(irq) \
329 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
330 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
331 # define ROUTING_ENTRY2(irq) \
332 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
334 # define ROUTING_ENTRY2(irq) \
335 IOAPIC_ROUTING_ENTRY(irq)
338 static const struct kvm_irq_routing_entry default_routing[] = {
339 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
340 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
341 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
342 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
343 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
344 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
345 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
346 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
347 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
348 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
349 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
350 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
352 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
353 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
354 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
355 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
356 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
357 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
358 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
359 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
360 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
361 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
362 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
363 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
367 int kvm_setup_default_irq_routing(struct kvm *kvm)
369 return kvm_set_irq_routing(kvm, default_routing,
370 ARRAY_SIZE(default_routing), 0);