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 inline int kvm_irq_line_state(unsigned long *irq_state
,
37 int irq_source_id
, int level
)
39 /* Logical OR for level trig interrupt */
41 set_bit(irq_source_id
, irq_state
);
43 clear_bit(irq_source_id
, irq_state
);
45 return !!(*irq_state
);
48 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry
*e
,
49 struct kvm
*kvm
, int irq_source_id
, int level
)
52 struct kvm_pic
*pic
= pic_irqchip(kvm
);
53 level
= kvm_irq_line_state(&pic
->irq_states
[e
->irqchip
.pin
],
54 irq_source_id
, level
);
55 return kvm_pic_set_irq(pic
, e
->irqchip
.pin
, level
);
61 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry
*e
,
62 struct kvm
*kvm
, int irq_source_id
, int level
)
64 struct kvm_ioapic
*ioapic
= kvm
->arch
.vioapic
;
65 level
= kvm_irq_line_state(&ioapic
->irq_states
[e
->irqchip
.pin
],
66 irq_source_id
, level
);
68 return kvm_ioapic_set_irq(ioapic
, e
->irqchip
.pin
, level
);
71 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq
*irq
)
74 return irq
->delivery_mode
==
75 (IOSAPIC_LOWEST_PRIORITY
<< IOSAPIC_DELIVERY_SHIFT
);
77 return irq
->delivery_mode
== APIC_DM_LOWEST
;
81 int kvm_irq_delivery_to_apic(struct kvm
*kvm
, struct kvm_lapic
*src
,
82 struct kvm_lapic_irq
*irq
)
85 struct kvm_vcpu
*vcpu
, *lowest
= NULL
;
87 if (irq
->dest_mode
== 0 && irq
->dest_id
== 0xff &&
88 kvm_is_dm_lowest_prio(irq
))
89 printk(KERN_INFO
"kvm: apic: phys broadcast and lowest prio\n");
91 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
92 if (!kvm_apic_present(vcpu
))
95 if (!kvm_apic_match_dest(vcpu
, src
, irq
->shorthand
,
96 irq
->dest_id
, irq
->dest_mode
))
99 if (!kvm_is_dm_lowest_prio(irq
)) {
102 r
+= kvm_apic_set_irq(vcpu
, irq
);
103 } else if (kvm_lapic_enabled(vcpu
)) {
106 else if (kvm_apic_compare_prio(vcpu
, lowest
) < 0)
112 r
= kvm_apic_set_irq(lowest
, irq
);
117 int kvm_set_msi(struct kvm_kernel_irq_routing_entry
*e
,
118 struct kvm
*kvm
, int irq_source_id
, int level
)
120 struct kvm_lapic_irq irq
;
125 trace_kvm_msi_set_irq(e
->msi
.address_lo
, e
->msi
.data
);
127 irq
.dest_id
= (e
->msi
.address_lo
&
128 MSI_ADDR_DEST_ID_MASK
) >> MSI_ADDR_DEST_ID_SHIFT
;
129 irq
.vector
= (e
->msi
.data
&
130 MSI_DATA_VECTOR_MASK
) >> MSI_DATA_VECTOR_SHIFT
;
131 irq
.dest_mode
= (1 << MSI_ADDR_DEST_MODE_SHIFT
) & e
->msi
.address_lo
;
132 irq
.trig_mode
= (1 << MSI_DATA_TRIGGER_SHIFT
) & e
->msi
.data
;
133 irq
.delivery_mode
= e
->msi
.data
& 0x700;
137 /* TODO Deal with RH bit of MSI message address */
138 return kvm_irq_delivery_to_apic(kvm
, NULL
, &irq
);
141 int kvm_send_userspace_msi(struct kvm
*kvm
, struct kvm_msi
*msi
)
143 struct kvm_kernel_irq_routing_entry route
;
145 if (!irqchip_in_kernel(kvm
) || msi
->flags
!= 0)
148 route
.msi
.address_lo
= msi
->address_lo
;
149 route
.msi
.address_hi
= msi
->address_hi
;
150 route
.msi
.data
= msi
->data
;
152 return kvm_set_msi(&route
, kvm
, KVM_USERSPACE_IRQ_SOURCE_ID
, 1);
157 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
158 * = 0 Interrupt was coalesced (previous irq is still pending)
159 * > 0 Number of CPUs interrupt was delivered to
161 int kvm_set_irq(struct kvm
*kvm
, int irq_source_id
, u32 irq
, int level
)
163 struct kvm_kernel_irq_routing_entry
*e
, irq_set
[KVM_NR_IRQCHIPS
];
165 struct kvm_irq_routing_table
*irq_rt
;
166 struct hlist_node
*n
;
168 trace_kvm_set_irq(irq
, level
, irq_source_id
);
170 /* Not possible to detect if the guest uses the PIC or the
171 * IOAPIC. So set the bit in both. The guest will ignore
172 * writes to the unused one.
175 irq_rt
= rcu_dereference(kvm
->irq_routing
);
176 if (irq
< irq_rt
->nr_rt_entries
)
177 hlist_for_each_entry(e
, n
, &irq_rt
->map
[irq
], link
)
183 r
= irq_set
[i
].set(&irq_set
[i
], kvm
, irq_source_id
, level
);
187 ret
= r
+ ((ret
< 0) ? 0 : ret
);
193 void kvm_notify_acked_irq(struct kvm
*kvm
, unsigned irqchip
, unsigned pin
)
195 struct kvm_irq_ack_notifier
*kian
;
196 struct hlist_node
*n
;
199 trace_kvm_ack_irq(irqchip
, pin
);
202 gsi
= rcu_dereference(kvm
->irq_routing
)->chip
[irqchip
][pin
];
204 hlist_for_each_entry_rcu(kian
, n
, &kvm
->irq_ack_notifier_list
,
206 if (kian
->gsi
== gsi
)
207 kian
->irq_acked(kian
);
211 void kvm_register_irq_ack_notifier(struct kvm
*kvm
,
212 struct kvm_irq_ack_notifier
*kian
)
214 mutex_lock(&kvm
->irq_lock
);
215 hlist_add_head_rcu(&kian
->link
, &kvm
->irq_ack_notifier_list
);
216 mutex_unlock(&kvm
->irq_lock
);
219 void kvm_unregister_irq_ack_notifier(struct kvm
*kvm
,
220 struct kvm_irq_ack_notifier
*kian
)
222 mutex_lock(&kvm
->irq_lock
);
223 hlist_del_init_rcu(&kian
->link
);
224 mutex_unlock(&kvm
->irq_lock
);
228 int kvm_request_irq_source_id(struct kvm
*kvm
)
230 unsigned long *bitmap
= &kvm
->arch
.irq_sources_bitmap
;
233 mutex_lock(&kvm
->irq_lock
);
234 irq_source_id
= find_first_zero_bit(bitmap
, BITS_PER_LONG
);
236 if (irq_source_id
>= BITS_PER_LONG
) {
237 printk(KERN_WARNING
"kvm: exhaust allocatable IRQ sources!\n");
238 irq_source_id
= -EFAULT
;
242 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
243 set_bit(irq_source_id
, bitmap
);
245 mutex_unlock(&kvm
->irq_lock
);
247 return irq_source_id
;
250 void kvm_free_irq_source_id(struct kvm
*kvm
, int irq_source_id
)
254 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
256 mutex_lock(&kvm
->irq_lock
);
257 if (irq_source_id
< 0 ||
258 irq_source_id
>= BITS_PER_LONG
) {
259 printk(KERN_ERR
"kvm: IRQ source ID out of range!\n");
262 clear_bit(irq_source_id
, &kvm
->arch
.irq_sources_bitmap
);
263 if (!irqchip_in_kernel(kvm
))
266 for (i
= 0; i
< KVM_IOAPIC_NUM_PINS
; i
++) {
267 clear_bit(irq_source_id
, &kvm
->arch
.vioapic
->irq_states
[i
]);
271 clear_bit(irq_source_id
, &pic_irqchip(kvm
)->irq_states
[i
]);
275 mutex_unlock(&kvm
->irq_lock
);
278 void kvm_register_irq_mask_notifier(struct kvm
*kvm
, int irq
,
279 struct kvm_irq_mask_notifier
*kimn
)
281 mutex_lock(&kvm
->irq_lock
);
283 hlist_add_head_rcu(&kimn
->link
, &kvm
->mask_notifier_list
);
284 mutex_unlock(&kvm
->irq_lock
);
287 void kvm_unregister_irq_mask_notifier(struct kvm
*kvm
, int irq
,
288 struct kvm_irq_mask_notifier
*kimn
)
290 mutex_lock(&kvm
->irq_lock
);
291 hlist_del_rcu(&kimn
->link
);
292 mutex_unlock(&kvm
->irq_lock
);
296 void kvm_fire_mask_notifiers(struct kvm
*kvm
, unsigned irqchip
, unsigned pin
,
299 struct kvm_irq_mask_notifier
*kimn
;
300 struct hlist_node
*n
;
304 gsi
= rcu_dereference(kvm
->irq_routing
)->chip
[irqchip
][pin
];
306 hlist_for_each_entry_rcu(kimn
, n
, &kvm
->mask_notifier_list
, link
)
307 if (kimn
->irq
== gsi
)
308 kimn
->func(kimn
, mask
);
312 void kvm_free_irq_routing(struct kvm
*kvm
)
314 /* Called only during vm destruction. Nobody can use the pointer
316 kfree(kvm
->irq_routing
);
319 static int setup_routing_entry(struct kvm_irq_routing_table
*rt
,
320 struct kvm_kernel_irq_routing_entry
*e
,
321 const struct kvm_irq_routing_entry
*ue
)
326 struct kvm_kernel_irq_routing_entry
*ei
;
327 struct hlist_node
*n
;
330 * Do not allow GSI to be mapped to the same irqchip more than once.
331 * Allow only one to one mapping between GSI and MSI.
333 hlist_for_each_entry(ei
, n
, &rt
->map
[ue
->gsi
], link
)
334 if (ei
->type
== KVM_IRQ_ROUTING_MSI
||
335 ue
->u
.irqchip
.irqchip
== ei
->irqchip
.irqchip
)
341 case KVM_IRQ_ROUTING_IRQCHIP
:
343 switch (ue
->u
.irqchip
.irqchip
) {
344 case KVM_IRQCHIP_PIC_MASTER
:
345 e
->set
= kvm_set_pic_irq
;
348 case KVM_IRQCHIP_PIC_SLAVE
:
349 e
->set
= kvm_set_pic_irq
;
353 case KVM_IRQCHIP_IOAPIC
:
354 max_pin
= KVM_IOAPIC_NUM_PINS
;
355 e
->set
= kvm_set_ioapic_irq
;
360 e
->irqchip
.irqchip
= ue
->u
.irqchip
.irqchip
;
361 e
->irqchip
.pin
= ue
->u
.irqchip
.pin
+ delta
;
362 if (e
->irqchip
.pin
>= max_pin
)
364 rt
->chip
[ue
->u
.irqchip
.irqchip
][e
->irqchip
.pin
] = ue
->gsi
;
366 case KVM_IRQ_ROUTING_MSI
:
367 e
->set
= kvm_set_msi
;
368 e
->msi
.address_lo
= ue
->u
.msi
.address_lo
;
369 e
->msi
.address_hi
= ue
->u
.msi
.address_hi
;
370 e
->msi
.data
= ue
->u
.msi
.data
;
376 hlist_add_head(&e
->link
, &rt
->map
[e
->gsi
]);
383 int kvm_set_irq_routing(struct kvm
*kvm
,
384 const struct kvm_irq_routing_entry
*ue
,
388 struct kvm_irq_routing_table
*new, *old
;
389 u32 i
, j
, nr_rt_entries
= 0;
392 for (i
= 0; i
< nr
; ++i
) {
393 if (ue
[i
].gsi
>= KVM_MAX_IRQ_ROUTES
)
395 nr_rt_entries
= max(nr_rt_entries
, ue
[i
].gsi
);
400 new = kzalloc(sizeof(*new) + (nr_rt_entries
* sizeof(struct hlist_head
))
401 + (nr
* sizeof(struct kvm_kernel_irq_routing_entry
)),
407 new->rt_entries
= (void *)&new->map
[nr_rt_entries
];
409 new->nr_rt_entries
= nr_rt_entries
;
410 for (i
= 0; i
< 3; i
++)
411 for (j
= 0; j
< KVM_IOAPIC_NUM_PINS
; j
++)
412 new->chip
[i
][j
] = -1;
414 for (i
= 0; i
< nr
; ++i
) {
418 r
= setup_routing_entry(new, &new->rt_entries
[i
], ue
);
424 mutex_lock(&kvm
->irq_lock
);
425 old
= kvm
->irq_routing
;
426 kvm_irq_routing_update(kvm
, new);
427 mutex_unlock(&kvm
->irq_lock
);
439 #define IOAPIC_ROUTING_ENTRY(irq) \
440 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
441 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
442 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
445 # define PIC_ROUTING_ENTRY(irq) \
446 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
447 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
448 # define ROUTING_ENTRY2(irq) \
449 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
451 # define ROUTING_ENTRY2(irq) \
452 IOAPIC_ROUTING_ENTRY(irq)
455 static const struct kvm_irq_routing_entry default_routing
[] = {
456 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
457 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
458 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
459 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
460 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
461 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
462 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
463 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
464 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
465 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
466 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
467 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
469 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
470 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
471 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
472 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
473 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
474 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
475 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
476 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
477 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
478 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
479 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
480 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
484 int kvm_setup_default_irq_routing(struct kvm
*kvm
)
486 return kvm_set_irq_routing(kvm
, default_routing
,
487 ARRAY_SIZE(default_routing
), 0);