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 void kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
33 struct kvm *kvm, int level)
36 kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
40 static void kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
41 struct kvm *kvm, int level)
43 kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
46 static void kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
47 struct kvm *kvm, int level)
50 struct kvm_vcpu *vcpu;
51 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
52 int dest_id = (e->msi.address_lo & MSI_ADDR_DEST_ID_MASK)
53 >> MSI_ADDR_DEST_ID_SHIFT;
54 int vector = (e->msi.data & MSI_DATA_VECTOR_MASK)
55 >> MSI_DATA_VECTOR_SHIFT;
56 int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
57 (unsigned long *)&e->msi.address_lo);
58 int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
59 (unsigned long *)&e->msi.data);
60 int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
61 (unsigned long *)&e->msi.data);
66 deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
68 /* IOAPIC delivery mode value is the same as MSI here */
69 switch (delivery_mode) {
70 case IOAPIC_LOWEST_PRIORITY:
71 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
74 kvm_apic_set_irq(vcpu, vector, trig_mode);
76 printk(KERN_INFO "kvm: null lowest priority vcpu!\n");
79 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
80 if (!(deliver_bitmask & (1 << vcpu_id)))
82 deliver_bitmask &= ~(1 << vcpu_id);
83 vcpu = ioapic->kvm->vcpus[vcpu_id];
85 kvm_apic_set_irq(vcpu, vector, trig_mode);
93 /* This should be called with the kvm->lock mutex held */
94 void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
96 struct kvm_kernel_irq_routing_entry *e;
97 unsigned long *irq_state, sig_level;
99 if (irq < KVM_IOAPIC_NUM_PINS) {
100 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
102 /* Logical OR for level trig interrupt */
104 set_bit(irq_source_id, irq_state);
106 clear_bit(irq_source_id, irq_state);
107 sig_level = !!(*irq_state);
108 } else /* Deal with MSI/MSI-X */
111 /* Not possible to detect if the guest uses the PIC or the
112 * IOAPIC. So set the bit in both. The guest will ignore
113 * writes to the unused one.
115 list_for_each_entry(e, &kvm->irq_routing, link)
117 e->set(e, kvm, sig_level);
120 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
122 struct kvm_kernel_irq_routing_entry *e;
123 struct kvm_irq_ack_notifier *kian;
124 struct hlist_node *n;
127 list_for_each_entry(e, &kvm->irq_routing, link)
128 if (e->irqchip.irqchip == irqchip &&
129 e->irqchip.pin == pin) {
134 hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
135 if (kian->gsi == gsi)
136 kian->irq_acked(kian);
139 void kvm_register_irq_ack_notifier(struct kvm *kvm,
140 struct kvm_irq_ack_notifier *kian)
142 hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
145 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
147 hlist_del_init(&kian->link);
150 /* The caller must hold kvm->lock mutex */
151 int kvm_request_irq_source_id(struct kvm *kvm)
153 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
154 int irq_source_id = find_first_zero_bit(bitmap,
155 sizeof(kvm->arch.irq_sources_bitmap));
157 if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
158 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
162 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
163 set_bit(irq_source_id, bitmap);
165 return irq_source_id;
168 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
172 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
174 if (irq_source_id < 0 ||
175 irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
176 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
179 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
180 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
181 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
184 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
185 struct kvm_irq_mask_notifier *kimn)
188 hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
191 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
192 struct kvm_irq_mask_notifier *kimn)
194 hlist_del(&kimn->link);
197 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
199 struct kvm_irq_mask_notifier *kimn;
200 struct hlist_node *n;
202 hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
203 if (kimn->irq == irq)
204 kimn->func(kimn, mask);
207 static void __kvm_free_irq_routing(struct list_head *irq_routing)
209 struct kvm_kernel_irq_routing_entry *e, *n;
211 list_for_each_entry_safe(e, n, irq_routing, link)
215 void kvm_free_irq_routing(struct kvm *kvm)
217 __kvm_free_irq_routing(&kvm->irq_routing);
220 int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
221 const struct kvm_irq_routing_entry *ue)
228 case KVM_IRQ_ROUTING_IRQCHIP:
230 switch (ue->u.irqchip.irqchip) {
231 case KVM_IRQCHIP_PIC_MASTER:
232 e->set = kvm_set_pic_irq;
234 case KVM_IRQCHIP_PIC_SLAVE:
235 e->set = kvm_set_pic_irq;
238 case KVM_IRQCHIP_IOAPIC:
239 e->set = kvm_set_ioapic_irq;
244 e->irqchip.irqchip = ue->u.irqchip.irqchip;
245 e->irqchip.pin = ue->u.irqchip.pin + delta;
247 case KVM_IRQ_ROUTING_MSI:
248 e->set = kvm_set_msi;
249 e->msi.address_lo = ue->u.msi.address_lo;
250 e->msi.address_hi = ue->u.msi.address_hi;
251 e->msi.data = ue->u.msi.data;
262 int kvm_set_irq_routing(struct kvm *kvm,
263 const struct kvm_irq_routing_entry *ue,
267 struct list_head irq_list = LIST_HEAD_INIT(irq_list);
268 struct list_head tmp = LIST_HEAD_INIT(tmp);
269 struct kvm_kernel_irq_routing_entry *e = NULL;
273 for (i = 0; i < nr; ++i) {
275 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
280 e = kzalloc(sizeof(*e), GFP_KERNEL);
283 r = setup_routing_entry(e, ue);
287 list_add(&e->link, &irq_list);
291 mutex_lock(&kvm->lock);
292 list_splice(&kvm->irq_routing, &tmp);
293 INIT_LIST_HEAD(&kvm->irq_routing);
294 list_splice(&irq_list, &kvm->irq_routing);
295 INIT_LIST_HEAD(&irq_list);
296 list_splice(&tmp, &irq_list);
297 mutex_unlock(&kvm->lock);
303 __kvm_free_irq_routing(&irq_list);
307 #define IOAPIC_ROUTING_ENTRY(irq) \
308 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
309 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
310 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
313 # define PIC_ROUTING_ENTRY(irq) \
314 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
315 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
316 # define ROUTING_ENTRY2(irq) \
317 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
319 # define ROUTING_ENTRY2(irq) \
320 IOAPIC_ROUTING_ENTRY(irq)
323 static const struct kvm_irq_routing_entry default_routing[] = {
324 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
325 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
326 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
327 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
328 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
329 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
330 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
331 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
332 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
333 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
334 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
335 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
337 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
338 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
339 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
340 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
341 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
342 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
343 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
344 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
345 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
346 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
347 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
348 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
352 int kvm_setup_default_irq_routing(struct kvm *kvm)
354 return kvm_set_irq_routing(kvm, default_routing,
355 ARRAY_SIZE(default_routing), 0);