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>
30 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
31 struct kvm *kvm, int level)
34 return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
40 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
41 struct kvm *kvm, int level)
43 return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
46 void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
47 union kvm_ioapic_redirect_entry *entry,
48 unsigned long *deliver_bitmask)
50 struct kvm_vcpu *vcpu;
52 kvm_ioapic_get_delivery_bitmask(ioapic, entry->fields.dest_id,
53 entry->fields.dest_mode,
55 switch (entry->fields.delivery_mode) {
56 case IOAPIC_LOWEST_PRIORITY:
57 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
58 entry->fields.vector, *deliver_bitmask);
59 *deliver_bitmask = 1 << vcpu->vcpu_id;
65 if (printk_ratelimit())
66 printk(KERN_INFO "kvm: unsupported delivery mode %d\n",
67 entry->fields.delivery_mode);
72 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
73 struct kvm *kvm, int level)
76 struct kvm_vcpu *vcpu;
77 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
78 union kvm_ioapic_redirect_entry entry;
79 unsigned long deliver_bitmask;
84 entry.fields.dest_id = (e->msi.address_lo &
85 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
86 entry.fields.vector = (e->msi.data &
87 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
88 entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
89 (unsigned long *)&e->msi.address_lo);
90 entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
91 (unsigned long *)&e->msi.data);
92 entry.fields.delivery_mode = test_bit(
93 MSI_DATA_DELIVERY_MODE_SHIFT,
94 (unsigned long *)&e->msi.data);
96 /* TODO Deal with RH bit of MSI message address */
98 kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
100 if (!deliver_bitmask) {
101 printk(KERN_WARNING "kvm: no destination for MSI delivery!");
104 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
105 if (!(deliver_bitmask & (1 << vcpu_id)))
107 deliver_bitmask &= ~(1 << vcpu_id);
108 vcpu = ioapic->kvm->vcpus[vcpu_id];
112 r += kvm_apic_set_irq(vcpu, entry.fields.vector,
113 entry.fields.trig_mode);
119 /* This should be called with the kvm->lock mutex held
121 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
122 * = 0 Interrupt was coalesced (previous irq is still pending)
123 * > 0 Number of CPUs interrupt was delivered to
125 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
127 struct kvm_kernel_irq_routing_entry *e;
128 unsigned long *irq_state, sig_level;
131 if (irq < KVM_IOAPIC_NUM_PINS) {
132 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
134 /* Logical OR for level trig interrupt */
136 set_bit(irq_source_id, irq_state);
138 clear_bit(irq_source_id, irq_state);
139 sig_level = !!(*irq_state);
140 } else /* Deal with MSI/MSI-X */
143 /* Not possible to detect if the guest uses the PIC or the
144 * IOAPIC. So set the bit in both. The guest will ignore
145 * writes to the unused one.
147 list_for_each_entry(e, &kvm->irq_routing, link)
149 int r = e->set(e, kvm, sig_level);
153 ret = r + ((ret < 0) ? 0 : ret);
158 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
160 struct kvm_kernel_irq_routing_entry *e;
161 struct kvm_irq_ack_notifier *kian;
162 struct hlist_node *n;
165 list_for_each_entry(e, &kvm->irq_routing, link)
166 if (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 hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
183 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian)
185 hlist_del_init(&kian->link);
188 /* The caller must hold kvm->lock mutex */
189 int kvm_request_irq_source_id(struct kvm *kvm)
191 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
192 int irq_source_id = find_first_zero_bit(bitmap,
193 sizeof(kvm->arch.irq_sources_bitmap));
195 if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
196 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
200 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
201 set_bit(irq_source_id, bitmap);
203 return irq_source_id;
206 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
210 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
212 if (irq_source_id < 0 ||
213 irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
214 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
217 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
218 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
219 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
222 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
223 struct kvm_irq_mask_notifier *kimn)
226 hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
229 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
230 struct kvm_irq_mask_notifier *kimn)
232 hlist_del(&kimn->link);
235 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
237 struct kvm_irq_mask_notifier *kimn;
238 struct hlist_node *n;
240 hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
241 if (kimn->irq == irq)
242 kimn->func(kimn, mask);
245 static void __kvm_free_irq_routing(struct list_head *irq_routing)
247 struct kvm_kernel_irq_routing_entry *e, *n;
249 list_for_each_entry_safe(e, n, irq_routing, link)
253 void kvm_free_irq_routing(struct kvm *kvm)
255 __kvm_free_irq_routing(&kvm->irq_routing);
258 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
259 const struct kvm_irq_routing_entry *ue)
266 case KVM_IRQ_ROUTING_IRQCHIP:
268 switch (ue->u.irqchip.irqchip) {
269 case KVM_IRQCHIP_PIC_MASTER:
270 e->set = kvm_set_pic_irq;
272 case KVM_IRQCHIP_PIC_SLAVE:
273 e->set = kvm_set_pic_irq;
276 case KVM_IRQCHIP_IOAPIC:
277 e->set = kvm_set_ioapic_irq;
282 e->irqchip.irqchip = ue->u.irqchip.irqchip;
283 e->irqchip.pin = ue->u.irqchip.pin + delta;
285 case KVM_IRQ_ROUTING_MSI:
286 e->set = kvm_set_msi;
287 e->msi.address_lo = ue->u.msi.address_lo;
288 e->msi.address_hi = ue->u.msi.address_hi;
289 e->msi.data = ue->u.msi.data;
300 int kvm_set_irq_routing(struct kvm *kvm,
301 const struct kvm_irq_routing_entry *ue,
305 struct list_head irq_list = LIST_HEAD_INIT(irq_list);
306 struct list_head tmp = LIST_HEAD_INIT(tmp);
307 struct kvm_kernel_irq_routing_entry *e = NULL;
311 for (i = 0; i < nr; ++i) {
313 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
318 e = kzalloc(sizeof(*e), GFP_KERNEL);
321 r = setup_routing_entry(e, ue);
325 list_add(&e->link, &irq_list);
329 mutex_lock(&kvm->lock);
330 list_splice(&kvm->irq_routing, &tmp);
331 INIT_LIST_HEAD(&kvm->irq_routing);
332 list_splice(&irq_list, &kvm->irq_routing);
333 INIT_LIST_HEAD(&irq_list);
334 list_splice(&tmp, &irq_list);
335 mutex_unlock(&kvm->lock);
341 __kvm_free_irq_routing(&irq_list);
345 #define IOAPIC_ROUTING_ENTRY(irq) \
346 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
347 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
348 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
351 # define PIC_ROUTING_ENTRY(irq) \
352 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
353 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
354 # define ROUTING_ENTRY2(irq) \
355 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
357 # define ROUTING_ENTRY2(irq) \
358 IOAPIC_ROUTING_ENTRY(irq)
361 static const struct kvm_irq_routing_entry default_routing[] = {
362 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
363 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
364 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
365 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
366 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
367 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
368 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
369 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
370 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
371 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
372 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
373 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
375 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
376 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
377 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
378 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
379 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
380 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
381 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
382 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
383 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
384 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
385 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
386 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
390 int kvm_setup_default_irq_routing(struct kvm *kvm)
392 return kvm_set_irq_routing(kvm, default_routing,
393 ARRAY_SIZE(default_routing), 0);