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>
27 /* This should be called with the kvm->lock mutex held */
28 void kvm_set_irq(struct kvm
*kvm
, int irq_source_id
, int irq
, int level
)
30 unsigned long *irq_state
= (unsigned long *)&kvm
->arch
.irq_states
[irq
];
32 /* Logical OR for level trig interrupt */
34 set_bit(irq_source_id
, irq_state
);
36 clear_bit(irq_source_id
, irq_state
);
38 /* Not possible to detect if the guest uses the PIC or the
39 * IOAPIC. So set the bit in both. The guest will ignore
40 * writes to the unused one.
42 kvm_ioapic_set_irq(kvm
->arch
.vioapic
, irq
, !!(*irq_state
));
44 kvm_pic_set_irq(pic_irqchip(kvm
), irq
, !!(*irq_state
));
48 void kvm_notify_acked_irq(struct kvm
*kvm
, unsigned gsi
)
50 struct kvm_irq_ack_notifier
*kian
;
53 hlist_for_each_entry(kian
, n
, &kvm
->arch
.irq_ack_notifier_list
, link
)
55 kian
->irq_acked(kian
);
58 void kvm_register_irq_ack_notifier(struct kvm
*kvm
,
59 struct kvm_irq_ack_notifier
*kian
)
61 hlist_add_head(&kian
->link
, &kvm
->arch
.irq_ack_notifier_list
);
64 void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier
*kian
)
66 hlist_del_init(&kian
->link
);
69 /* The caller must hold kvm->lock mutex */
70 int kvm_request_irq_source_id(struct kvm
*kvm
)
72 unsigned long *bitmap
= &kvm
->arch
.irq_sources_bitmap
;
73 int irq_source_id
= find_first_zero_bit(bitmap
,
74 sizeof(kvm
->arch
.irq_sources_bitmap
));
76 if (irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
77 printk(KERN_WARNING
"kvm: exhaust allocatable IRQ sources!\n");
81 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
82 set_bit(irq_source_id
, bitmap
);
87 void kvm_free_irq_source_id(struct kvm
*kvm
, int irq_source_id
)
91 ASSERT(irq_source_id
!= KVM_USERSPACE_IRQ_SOURCE_ID
);
93 if (irq_source_id
< 0 ||
94 irq_source_id
>= sizeof(kvm
->arch
.irq_sources_bitmap
)) {
95 printk(KERN_ERR
"kvm: IRQ source ID out of range!\n");
98 for (i
= 0; i
< KVM_IOAPIC_NUM_PINS
; i
++)
99 clear_bit(irq_source_id
, &kvm
->arch
.irq_states
[i
]);
100 clear_bit(irq_source_id
, &kvm
->arch
.irq_sources_bitmap
);