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 inline int kvm_irq_line_state(unsigned long *irq_state
,
35 int irq_source_id
, int level
)
37 /* Logical OR for level trig interrupt */
39 set_bit(irq_source_id
, irq_state
);
41 clear_bit(irq_source_id
, irq_state
);
43 return !!(*irq_state
);
46 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry
*e
,
47 struct kvm
*kvm
, int irq_source_id
, int level
)
50 struct kvm_pic
*pic
= pic_irqchip(kvm
);
51 level
= kvm_irq_line_state(&pic
->irq_states
[e
->irqchip
.pin
],
52 irq_source_id
, level
);
53 return kvm_pic_set_irq(pic
, e
->irqchip
.pin
, level
);
59 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry
*e
,
60 struct kvm
*kvm
, int irq_source_id
, int level
)
62 struct kvm_ioapic
*ioapic
= kvm
->arch
.vioapic
;
63 level
= kvm_irq_line_state(&ioapic
->irq_states
[e
->irqchip
.pin
],
64 irq_source_id
, level
);
66 return kvm_ioapic_set_irq(ioapic
, e
->irqchip
.pin
, level
);
69 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq
*irq
)
72 return irq
->delivery_mode
==
73 (IOSAPIC_LOWEST_PRIORITY
<< IOSAPIC_DELIVERY_SHIFT
);
75 return irq
->delivery_mode
== APIC_DM_LOWEST
;
79 int kvm_irq_delivery_to_apic(struct kvm
*kvm
, struct kvm_lapic
*src
,
80 struct kvm_lapic_irq
*irq
)
83 struct kvm_vcpu
*vcpu
, *lowest
= NULL
;
85 WARN_ON(!mutex_is_locked(&kvm
->irq_lock
));
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
);
106 else if (kvm_apic_compare_prio(vcpu
, lowest
) < 0)
112 r
= kvm_apic_set_irq(lowest
, irq
);
117 static 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 /* This should be called with the kvm->irq_lock mutex held
143 * < 0 Interrupt was ignored (masked or not delivered for other reasons)
144 * = 0 Interrupt was coalesced (previous irq is still pending)
145 * > 0 Number of CPUs interrupt was delivered to
147 int kvm_set_irq(struct kvm
*kvm
, int irq_source_id
, u32 irq
, int level
)
149 struct kvm_kernel_irq_routing_entry
*e
, irq_set
[KVM_NR_IRQCHIPS
];
151 struct kvm_irq_routing_table
*irq_rt
;
152 struct hlist_node
*n
;
154 trace_kvm_set_irq(irq
, level
, irq_source_id
);
156 WARN_ON(!mutex_is_locked(&kvm
->irq_lock
));
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
,
223 sizeof(kvm
->arch
.irq_sources_bitmap
));
225 if (irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
226 printk(KERN_WARNING
"kvm: exhaust allocatable IRQ sources!\n");
230 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
231 set_bit(irq_source_id
, bitmap
);
232 mutex_unlock(&kvm
->irq_lock
);
234 return irq_source_id
;
237 void kvm_free_irq_source_id(struct kvm
*kvm
, int irq_source_id
)
241 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
243 mutex_lock(&kvm
->irq_lock
);
244 if (irq_source_id
< 0 ||
245 irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
246 printk(KERN_ERR
"kvm: IRQ source ID out of range!\n");
249 for (i
= 0; i
< KVM_IOAPIC_NUM_PINS
; i
++) {
250 clear_bit(irq_source_id
, &kvm
->arch
.vioapic
->irq_states
[i
]);
254 clear_bit(irq_source_id
, &pic_irqchip(kvm
)->irq_states
[i
]);
257 clear_bit(irq_source_id
, &kvm
->arch
.irq_sources_bitmap
);
258 mutex_unlock(&kvm
->irq_lock
);
261 void kvm_register_irq_mask_notifier(struct kvm
*kvm
, int irq
,
262 struct kvm_irq_mask_notifier
*kimn
)
264 mutex_lock(&kvm
->irq_lock
);
266 hlist_add_head_rcu(&kimn
->link
, &kvm
->mask_notifier_list
);
267 mutex_unlock(&kvm
->irq_lock
);
270 void kvm_unregister_irq_mask_notifier(struct kvm
*kvm
, int irq
,
271 struct kvm_irq_mask_notifier
*kimn
)
273 mutex_lock(&kvm
->irq_lock
);
274 hlist_del_rcu(&kimn
->link
);
275 mutex_unlock(&kvm
->irq_lock
);
279 void kvm_fire_mask_notifiers(struct kvm
*kvm
, int irq
, bool mask
)
281 struct kvm_irq_mask_notifier
*kimn
;
282 struct hlist_node
*n
;
285 hlist_for_each_entry_rcu(kimn
, n
, &kvm
->mask_notifier_list
, link
)
286 if (kimn
->irq
== irq
)
287 kimn
->func(kimn
, mask
);
291 void kvm_free_irq_routing(struct kvm
*kvm
)
293 /* Called only during vm destruction. Nobody can use the pointer
295 kfree(kvm
->irq_routing
);
298 static int setup_routing_entry(struct kvm_irq_routing_table
*rt
,
299 struct kvm_kernel_irq_routing_entry
*e
,
300 const struct kvm_irq_routing_entry
*ue
)
304 struct kvm_kernel_irq_routing_entry
*ei
;
305 struct hlist_node
*n
;
308 * Do not allow GSI to be mapped to the same irqchip more than once.
309 * Allow only one to one mapping between GSI and MSI.
311 hlist_for_each_entry(ei
, n
, &rt
->map
[ue
->gsi
], link
)
312 if (ei
->type
== KVM_IRQ_ROUTING_MSI
||
313 ue
->u
.irqchip
.irqchip
== ei
->irqchip
.irqchip
)
319 case KVM_IRQ_ROUTING_IRQCHIP
:
321 switch (ue
->u
.irqchip
.irqchip
) {
322 case KVM_IRQCHIP_PIC_MASTER
:
323 e
->set
= kvm_set_pic_irq
;
325 case KVM_IRQCHIP_PIC_SLAVE
:
326 e
->set
= kvm_set_pic_irq
;
329 case KVM_IRQCHIP_IOAPIC
:
330 e
->set
= kvm_set_ioapic_irq
;
335 e
->irqchip
.irqchip
= ue
->u
.irqchip
.irqchip
;
336 e
->irqchip
.pin
= ue
->u
.irqchip
.pin
+ delta
;
337 if (e
->irqchip
.pin
>= KVM_IOAPIC_NUM_PINS
)
339 rt
->chip
[ue
->u
.irqchip
.irqchip
][e
->irqchip
.pin
] = ue
->gsi
;
341 case KVM_IRQ_ROUTING_MSI
:
342 e
->set
= kvm_set_msi
;
343 e
->msi
.address_lo
= ue
->u
.msi
.address_lo
;
344 e
->msi
.address_hi
= ue
->u
.msi
.address_hi
;
345 e
->msi
.data
= ue
->u
.msi
.data
;
351 hlist_add_head(&e
->link
, &rt
->map
[e
->gsi
]);
358 int kvm_set_irq_routing(struct kvm
*kvm
,
359 const struct kvm_irq_routing_entry
*ue
,
363 struct kvm_irq_routing_table
*new, *old
;
364 u32 i
, j
, nr_rt_entries
= 0;
367 for (i
= 0; i
< nr
; ++i
) {
368 if (ue
[i
].gsi
>= KVM_MAX_IRQ_ROUTES
)
370 nr_rt_entries
= max(nr_rt_entries
, ue
[i
].gsi
);
375 new = kzalloc(sizeof(*new) + (nr_rt_entries
* sizeof(struct hlist_head
))
376 + (nr
* sizeof(struct kvm_kernel_irq_routing_entry
)),
382 new->rt_entries
= (void *)&new->map
[nr_rt_entries
];
384 new->nr_rt_entries
= nr_rt_entries
;
385 for (i
= 0; i
< 3; i
++)
386 for (j
= 0; j
< KVM_IOAPIC_NUM_PINS
; j
++)
387 new->chip
[i
][j
] = -1;
389 for (i
= 0; i
< nr
; ++i
) {
393 r
= setup_routing_entry(new, &new->rt_entries
[i
], ue
);
399 mutex_lock(&kvm
->irq_lock
);
400 old
= kvm
->irq_routing
;
401 rcu_assign_pointer(kvm
->irq_routing
, new);
402 mutex_unlock(&kvm
->irq_lock
);
413 #define IOAPIC_ROUTING_ENTRY(irq) \
414 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
415 .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
416 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
419 # define PIC_ROUTING_ENTRY(irq) \
420 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
421 .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
422 # define ROUTING_ENTRY2(irq) \
423 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
425 # define ROUTING_ENTRY2(irq) \
426 IOAPIC_ROUTING_ENTRY(irq)
429 static const struct kvm_irq_routing_entry default_routing
[] = {
430 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
431 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
432 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
433 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
434 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
435 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
436 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
437 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
438 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
439 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
440 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
441 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
443 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
444 ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
445 ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
446 ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
447 ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
448 ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
449 ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
450 ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
451 ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
452 ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
453 ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
454 ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
458 int kvm_setup_default_irq_routing(struct kvm
*kvm
)
460 return kvm_set_irq_routing(kvm
, default_routing
,
461 ARRAY_SIZE(default_routing
), 0);