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>
23 #include <trace/events/kvm.h>
25 #include <asm/msidef.h>
27 #include <asm/iosapic.h>
34 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
35 struct kvm *kvm, int level)
38 return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
44 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
45 struct kvm *kvm, int level)
47 return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
50 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
53 return irq->delivery_mode ==
54 (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
56 return irq->delivery_mode == APIC_DM_LOWEST;
60 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
61 struct kvm_lapic_irq *irq)
64 struct kvm_vcpu *vcpu, *lowest = NULL;
66 WARN_ON(!mutex_is_locked(&kvm->irq_lock));
68 if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
69 kvm_is_dm_lowest_prio(irq))
70 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
72 kvm_for_each_vcpu(i, vcpu, kvm) {
73 if (!kvm_apic_present(vcpu))
76 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
77 irq->dest_id, irq->dest_mode))
80 if (!kvm_is_dm_lowest_prio(irq)) {
83 r += kvm_apic_set_irq(vcpu, irq);
87 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
93 r = kvm_apic_set_irq(lowest, irq);
98 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
99 struct kvm *kvm, int level)
101 struct kvm_lapic_irq irq;
103 irq.dest_id = (e->msi.address_lo &
104 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
105 irq.vector = (e->msi.data &
106 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
107 irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
108 irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
109 irq.delivery_mode = e->msi.data & 0x700;
113 /* TODO Deal with RH bit of MSI message address */
114 return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
117 /* This should be called with the kvm->irq_lock mutex held
119 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
120 * = 0 Interrupt was coalesced (previous irq is still pending)
121 * > 0 Number of CPUs interrupt was delivered to
123 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
125 struct kvm_kernel_irq_routing_entry *e;
126 unsigned long *irq_state, sig_level;
129 trace_kvm_set_irq(irq, level, irq_source_id);
131 WARN_ON(!mutex_is_locked(&kvm->irq_lock));
133 if (irq < KVM_IOAPIC_NUM_PINS) {
134 irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
136 /* Logical OR for level trig interrupt */
138 set_bit(irq_source_id, irq_state);
140 clear_bit(irq_source_id, irq_state);
141 sig_level = !!(*irq_state);
142 } else /* Deal with MSI/MSI-X */
145 /* Not possible to detect if the guest uses the PIC or the
146 * IOAPIC. So set the bit in both. The guest will ignore
147 * writes to the unused one.
149 list_for_each_entry(e, &kvm->irq_routing, link)
151 int r = e->set(e, kvm, sig_level);
155 ret = r + ((ret < 0) ? 0 : ret);
160 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
162 struct kvm_kernel_irq_routing_entry *e;
163 struct kvm_irq_ack_notifier *kian;
164 struct hlist_node *n;
167 trace_kvm_ack_irq(irqchip, pin);
169 list_for_each_entry(e, &kvm->irq_routing, link)
170 if (e->type == KVM_IRQ_ROUTING_IRQCHIP &&
171 e->irqchip.irqchip == irqchip &&
172 e->irqchip.pin == pin) {
177 hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
178 if (kian->gsi == gsi)
179 kian->irq_acked(kian);
182 void kvm_register_irq_ack_notifier(struct kvm *kvm,
183 struct kvm_irq_ack_notifier *kian)
185 mutex_lock(&kvm->irq_lock);
186 hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
187 mutex_unlock(&kvm->irq_lock);
190 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
191 struct kvm_irq_ack_notifier *kian)
193 mutex_lock(&kvm->irq_lock);
194 hlist_del_init(&kian->link);
195 mutex_unlock(&kvm->irq_lock);
198 int kvm_request_irq_source_id(struct kvm *kvm)
200 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
203 mutex_lock(&kvm->irq_lock);
204 irq_source_id = find_first_zero_bit(bitmap,
205 sizeof(kvm->arch.irq_sources_bitmap));
207 if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
208 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
212 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
213 set_bit(irq_source_id, bitmap);
214 mutex_unlock(&kvm->irq_lock);
216 return irq_source_id;
219 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
223 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
225 mutex_lock(&kvm->irq_lock);
226 if (irq_source_id < 0 ||
227 irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
228 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
231 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
232 clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
233 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
234 mutex_unlock(&kvm->irq_lock);
237 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
238 struct kvm_irq_mask_notifier *kimn)
240 mutex_lock(&kvm->irq_lock);
242 hlist_add_head(&kimn->link, &kvm->mask_notifier_list);
243 mutex_unlock(&kvm->irq_lock);
246 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
247 struct kvm_irq_mask_notifier *kimn)
249 mutex_lock(&kvm->irq_lock);
250 hlist_del(&kimn->link);
251 mutex_unlock(&kvm->irq_lock);
254 void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask)
256 struct kvm_irq_mask_notifier *kimn;
257 struct hlist_node *n;
259 WARN_ON(!mutex_is_locked(&kvm->irq_lock));
261 hlist_for_each_entry(kimn, n, &kvm->mask_notifier_list, link)
262 if (kimn->irq == irq)
263 kimn->func(kimn, mask);
266 static void __kvm_free_irq_routing(struct list_head *irq_routing)
268 struct kvm_kernel_irq_routing_entry *e, *n;
270 list_for_each_entry_safe(e, n, irq_routing, link)
274 void kvm_free_irq_routing(struct kvm *kvm)
276 mutex_lock(&kvm->irq_lock);
277 __kvm_free_irq_routing(&kvm->irq_routing);
278 mutex_unlock(&kvm->irq_lock);
281 static int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e,
282 const struct kvm_irq_routing_entry *ue)
290 case KVM_IRQ_ROUTING_IRQCHIP:
292 switch (ue->u.irqchip.irqchip) {
293 case KVM_IRQCHIP_PIC_MASTER:
294 e->set = kvm_set_pic_irq;
296 case KVM_IRQCHIP_PIC_SLAVE:
297 e->set = kvm_set_pic_irq;
300 case KVM_IRQCHIP_IOAPIC:
301 e->set = kvm_set_ioapic_irq;
306 e->irqchip.irqchip = ue->u.irqchip.irqchip;
307 e->irqchip.pin = ue->u.irqchip.pin + delta;
309 case KVM_IRQ_ROUTING_MSI:
310 e->set = kvm_set_msi;
311 e->msi.address_lo = ue->u.msi.address_lo;
312 e->msi.address_hi = ue->u.msi.address_hi;
313 e->msi.data = ue->u.msi.data;
324 int kvm_set_irq_routing(struct kvm *kvm,
325 const struct kvm_irq_routing_entry *ue,
329 struct list_head irq_list = LIST_HEAD_INIT(irq_list);
330 struct list_head tmp = LIST_HEAD_INIT(tmp);
331 struct kvm_kernel_irq_routing_entry *e = NULL;
335 for (i = 0; i < nr; ++i) {
337 if (ue->gsi >= KVM_MAX_IRQ_ROUTES)
342 e = kzalloc(sizeof(*e), GFP_KERNEL);
345 r = setup_routing_entry(e, ue);
349 list_add(&e->link, &irq_list);
353 mutex_lock(&kvm->irq_lock);
354 list_splice(&kvm->irq_routing, &tmp);
355 INIT_LIST_HEAD(&kvm->irq_routing);
356 list_splice(&irq_list, &kvm->irq_routing);
357 INIT_LIST_HEAD(&irq_list);
358 list_splice(&tmp, &irq_list);
359 mutex_unlock(&kvm->irq_lock);
365 __kvm_free_irq_routing(&irq_list);
369 #define IOAPIC_ROUTING_ENTRY(irq) \
370 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
371 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
372 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
375 # define PIC_ROUTING_ENTRY(irq) \
376 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
377 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
378 # define ROUTING_ENTRY2(irq) \
379 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
381 # define ROUTING_ENTRY2(irq) \
382 IOAPIC_ROUTING_ENTRY(irq)
385 static const struct kvm_irq_routing_entry default_routing[] = {
386 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
387 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
388 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
389 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
390 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
391 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
392 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
393 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
394 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
395 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
396 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
397 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
399 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
400 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
401 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
402 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
403 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
404 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
405 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
406 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
407 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
408 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
409 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
410 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
414 int kvm_setup_default_irq_routing(struct kvm *kvm)
416 return kvm_set_irq_routing(kvm, default_routing,
417 ARRAY_SIZE(default_routing), 0);