Xiantao Zhang | 3de42dc | 2008-10-06 13:48:45 +0800 | [diff] [blame] | 1 | /* |
| 2 | * irq_comm.c: Common API for in kernel interrupt controller |
| 3 | * Copyright (c) 2007, Intel Corporation. |
| 4 | * |
| 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. |
| 8 | * |
| 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 |
| 12 | * more details. |
| 13 | * |
| 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. |
| 17 | * Authors: |
| 18 | * Yaozu (Eddie) Dong <Eddie.dong@intel.com> |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <linux/kvm_host.h> |
| 23 | #include "irq.h" |
| 24 | |
| 25 | #include "ioapic.h" |
| 26 | |
| 27 | /* This should be called with the kvm->lock mutex held */ |
Sheng Yang | 5550af4 | 2008-10-15 20:15:06 +0800 | [diff] [blame] | 28 | void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) |
Xiantao Zhang | 3de42dc | 2008-10-06 13:48:45 +0800 | [diff] [blame] | 29 | { |
Sheng Yang | 5550af4 | 2008-10-15 20:15:06 +0800 | [diff] [blame] | 30 | unsigned long *irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; |
| 31 | |
| 32 | /* Logical OR for level trig interrupt */ |
| 33 | if (level) |
| 34 | set_bit(irq_source_id, irq_state); |
| 35 | else |
| 36 | clear_bit(irq_source_id, irq_state); |
| 37 | |
Xiantao Zhang | 3de42dc | 2008-10-06 13:48:45 +0800 | [diff] [blame] | 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. |
| 41 | */ |
Sheng Yang | 5550af4 | 2008-10-15 20:15:06 +0800 | [diff] [blame] | 42 | kvm_ioapic_set_irq(kvm->arch.vioapic, irq, !!(*irq_state)); |
Xiantao Zhang | 3de42dc | 2008-10-06 13:48:45 +0800 | [diff] [blame] | 43 | #ifdef CONFIG_X86 |
Sheng Yang | 5550af4 | 2008-10-15 20:15:06 +0800 | [diff] [blame] | 44 | kvm_pic_set_irq(pic_irqchip(kvm), irq, !!(*irq_state)); |
Xiantao Zhang | 3de42dc | 2008-10-06 13:48:45 +0800 | [diff] [blame] | 45 | #endif |
| 46 | } |
| 47 | |
| 48 | void kvm_notify_acked_irq(struct kvm *kvm, unsigned gsi) |
| 49 | { |
| 50 | struct kvm_irq_ack_notifier *kian; |
| 51 | struct hlist_node *n; |
| 52 | |
| 53 | hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link) |
| 54 | if (kian->gsi == gsi) |
| 55 | kian->irq_acked(kian); |
| 56 | } |
| 57 | |
| 58 | void kvm_register_irq_ack_notifier(struct kvm *kvm, |
| 59 | struct kvm_irq_ack_notifier *kian) |
| 60 | { |
| 61 | hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list); |
| 62 | } |
| 63 | |
Sheng Yang | e19e30e | 2008-10-20 16:07:10 +0800 | [diff] [blame] | 64 | void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian) |
Xiantao Zhang | 3de42dc | 2008-10-06 13:48:45 +0800 | [diff] [blame] | 65 | { |
Mark McLoughlin | fdd897e | 2008-12-01 13:57:46 +0000 | [diff] [blame] | 66 | hlist_del_init(&kian->link); |
Xiantao Zhang | 3de42dc | 2008-10-06 13:48:45 +0800 | [diff] [blame] | 67 | } |
Sheng Yang | 5550af4 | 2008-10-15 20:15:06 +0800 | [diff] [blame] | 68 | |
| 69 | /* The caller must hold kvm->lock mutex */ |
| 70 | int kvm_request_irq_source_id(struct kvm *kvm) |
| 71 | { |
| 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)); |
| 75 | if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
| 76 | printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); |
| 77 | irq_source_id = -EFAULT; |
| 78 | } else |
| 79 | set_bit(irq_source_id, bitmap); |
| 80 | return irq_source_id; |
| 81 | } |
| 82 | |
| 83 | void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) |
| 84 | { |
| 85 | int i; |
| 86 | |
| 87 | if (irq_source_id <= 0 || |
| 88 | irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
| 89 | printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); |
| 90 | return; |
| 91 | } |
| 92 | for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) |
| 93 | clear_bit(irq_source_id, &kvm->arch.irq_states[i]); |
| 94 | clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); |
| 95 | } |