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>
20 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
23 #include <linux/kvm_host.h>
24 #include <linux/slab.h>
25 #include <trace/events/kvm.h>
27 #include <asm/msidef.h>
29 #include <asm/iosapic.h>
36 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
37 struct kvm *kvm, int irq_source_id, int level)
40 struct kvm_pic *pic = pic_irqchip(kvm);
41 return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
47 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
48 struct kvm *kvm, int irq_source_id, int level)
50 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
51 return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level);
54 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
57 return irq->delivery_mode ==
58 (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
60 return irq->delivery_mode == APIC_DM_LOWEST;
64 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
65 struct kvm_lapic_irq *irq)
68 struct kvm_vcpu *vcpu, *lowest = NULL;
70 if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
71 kvm_is_dm_lowest_prio(irq)) {
72 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
73 irq->delivery_mode = APIC_DM_FIXED;
76 if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r))
79 kvm_for_each_vcpu(i, vcpu, kvm) {
80 if (!kvm_apic_present(vcpu))
83 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
84 irq->dest_id, irq->dest_mode))
87 if (!kvm_is_dm_lowest_prio(irq)) {
90 r += kvm_apic_set_irq(vcpu, irq);
91 } else if (kvm_lapic_enabled(vcpu)) {
94 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
100 r = kvm_apic_set_irq(lowest, irq);
105 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
106 struct kvm *kvm, int irq_source_id, int level)
108 struct kvm_lapic_irq irq;
113 trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
115 irq.dest_id = (e->msi.address_lo &
116 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
117 irq.vector = (e->msi.data &
118 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
119 irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
120 irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
121 irq.delivery_mode = e->msi.data & 0x700;
125 /* TODO Deal with RH bit of MSI message address */
126 return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
129 int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
131 struct kvm_kernel_irq_routing_entry route;
133 if (!irqchip_in_kernel(kvm) || msi->flags != 0)
136 route.msi.address_lo = msi->address_lo;
137 route.msi.address_hi = msi->address_hi;
138 route.msi.data = msi->data;
140 return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1);
145 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
146 * = 0 Interrupt was coalesced (previous irq is still pending)
147 * > 0 Number of CPUs interrupt was delivered to
149 int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
151 struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
153 struct kvm_irq_routing_table *irq_rt;
154 struct hlist_node *n;
156 trace_kvm_set_irq(irq, level, irq_source_id);
158 /* Not possible to detect if the guest uses the PIC or the
159 * IOAPIC. So set the bit in both. The guest will ignore
160 * writes to the unused one.
163 irq_rt = rcu_dereference(kvm->irq_routing);
164 if (irq < irq_rt->nr_rt_entries)
165 hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
171 r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
175 ret = r + ((ret < 0) ? 0 : ret);
181 void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
183 struct kvm_irq_ack_notifier *kian;
184 struct hlist_node *n;
187 trace_kvm_ack_irq(irqchip, pin);
190 gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
192 hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
194 if (kian->gsi == gsi)
195 kian->irq_acked(kian);
199 void kvm_register_irq_ack_notifier(struct kvm *kvm,
200 struct kvm_irq_ack_notifier *kian)
202 mutex_lock(&kvm->irq_lock);
203 hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
204 mutex_unlock(&kvm->irq_lock);
207 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
208 struct kvm_irq_ack_notifier *kian)
210 mutex_lock(&kvm->irq_lock);
211 hlist_del_init_rcu(&kian->link);
212 mutex_unlock(&kvm->irq_lock);
216 int kvm_request_irq_source_id(struct kvm *kvm)
218 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
221 mutex_lock(&kvm->irq_lock);
222 irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
224 if (irq_source_id >= BITS_PER_LONG) {
225 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
226 irq_source_id = -EFAULT;
230 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
232 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
234 set_bit(irq_source_id, bitmap);
236 mutex_unlock(&kvm->irq_lock);
238 return irq_source_id;
241 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
243 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
245 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
248 mutex_lock(&kvm->irq_lock);
249 if (irq_source_id < 0 ||
250 irq_source_id >= BITS_PER_LONG) {
251 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
254 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
255 if (!irqchip_in_kernel(kvm))
258 kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
260 kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id);
263 mutex_unlock(&kvm->irq_lock);
266 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
267 struct kvm_irq_mask_notifier *kimn)
269 mutex_lock(&kvm->irq_lock);
271 hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list);
272 mutex_unlock(&kvm->irq_lock);
275 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
276 struct kvm_irq_mask_notifier *kimn)
278 mutex_lock(&kvm->irq_lock);
279 hlist_del_rcu(&kimn->link);
280 mutex_unlock(&kvm->irq_lock);
284 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
287 struct kvm_irq_mask_notifier *kimn;
288 struct hlist_node *n;
292 gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
294 hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link)
295 if (kimn->irq == gsi)
296 kimn->func(kimn, mask);
300 void kvm_free_irq_routing(struct kvm *kvm)
302 /* Called only during vm destruction. Nobody can use the pointer
304 kfree(kvm->irq_routing);
307 static int setup_routing_entry(struct kvm_irq_routing_table *rt,
308 struct kvm_kernel_irq_routing_entry *e,
309 const struct kvm_irq_routing_entry *ue)
314 struct kvm_kernel_irq_routing_entry *ei;
315 struct hlist_node *n;
318 * Do not allow GSI to be mapped to the same irqchip more than once.
319 * Allow only one to one mapping between GSI and MSI.
321 hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link)
322 if (ei->type == KVM_IRQ_ROUTING_MSI ||
323 ue->type == KVM_IRQ_ROUTING_MSI ||
324 ue->u.irqchip.irqchip == ei->irqchip.irqchip)
330 case KVM_IRQ_ROUTING_IRQCHIP:
332 switch (ue->u.irqchip.irqchip) {
333 case KVM_IRQCHIP_PIC_MASTER:
334 e->set = kvm_set_pic_irq;
335 max_pin = PIC_NUM_PINS;
337 case KVM_IRQCHIP_PIC_SLAVE:
338 e->set = kvm_set_pic_irq;
339 max_pin = PIC_NUM_PINS;
342 case KVM_IRQCHIP_IOAPIC:
343 max_pin = KVM_IOAPIC_NUM_PINS;
344 e->set = kvm_set_ioapic_irq;
349 e->irqchip.irqchip = ue->u.irqchip.irqchip;
350 e->irqchip.pin = ue->u.irqchip.pin + delta;
351 if (e->irqchip.pin >= max_pin)
353 rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
355 case KVM_IRQ_ROUTING_MSI:
356 e->set = kvm_set_msi;
357 e->msi.address_lo = ue->u.msi.address_lo;
358 e->msi.address_hi = ue->u.msi.address_hi;
359 e->msi.data = ue->u.msi.data;
365 hlist_add_head(&e->link, &rt->map[e->gsi]);
372 int kvm_set_irq_routing(struct kvm *kvm,
373 const struct kvm_irq_routing_entry *ue,
377 struct kvm_irq_routing_table *new, *old;
378 u32 i, j, nr_rt_entries = 0;
381 for (i = 0; i < nr; ++i) {
382 if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
384 nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
389 new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
390 + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
396 new->rt_entries = (void *)&new->map[nr_rt_entries];
398 new->nr_rt_entries = nr_rt_entries;
399 for (i = 0; i < 3; i++)
400 for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
401 new->chip[i][j] = -1;
403 for (i = 0; i < nr; ++i) {
407 r = setup_routing_entry(new, &new->rt_entries[i], ue);
413 mutex_lock(&kvm->irq_lock);
414 old = kvm->irq_routing;
415 kvm_irq_routing_update(kvm, new);
416 mutex_unlock(&kvm->irq_lock);
428 #define IOAPIC_ROUTING_ENTRY(irq) \
429 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
430 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
431 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
434 # define PIC_ROUTING_ENTRY(irq) \
435 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
436 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
437 # define ROUTING_ENTRY2(irq) \
438 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
440 # define ROUTING_ENTRY2(irq) \
441 IOAPIC_ROUTING_ENTRY(irq)
444 static const struct kvm_irq_routing_entry default_routing[] = {
445 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
446 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
447 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
448 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
449 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
450 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
451 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
452 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
453 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
454 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
455 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
456 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
458 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
459 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
460 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
461 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
462 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
463 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
464 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
465 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
466 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
467 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
468 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
469 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
473 int kvm_setup_default_irq_routing(struct kvm *kvm)
475 return kvm_set_irq_routing(kvm, default_routing,
476 ARRAY_SIZE(default_routing), 0);