| /* |
| * irq_comm.c: Common API for in kernel interrupt controller |
| * Copyright (c) 2007, Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| * Place - Suite 330, Boston, MA 02111-1307 USA. |
| * Authors: |
| * Yaozu (Eddie) Dong <Eddie.dong@intel.com> |
| * |
| */ |
| |
| #include <linux/kvm_host.h> |
| #include "irq.h" |
| |
| #include "ioapic.h" |
| |
| /* This should be called with the kvm->lock mutex held */ |
| void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) |
| { |
| unsigned long *irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; |
| |
| /* Logical OR for level trig interrupt */ |
| if (level) |
| set_bit(irq_source_id, irq_state); |
| else |
| clear_bit(irq_source_id, irq_state); |
| |
| /* Not possible to detect if the guest uses the PIC or the |
| * IOAPIC. So set the bit in both. The guest will ignore |
| * writes to the unused one. |
| */ |
| kvm_ioapic_set_irq(kvm->arch.vioapic, irq, !!(*irq_state)); |
| #ifdef CONFIG_X86 |
| kvm_pic_set_irq(pic_irqchip(kvm), irq, !!(*irq_state)); |
| #endif |
| } |
| |
| void kvm_notify_acked_irq(struct kvm *kvm, unsigned gsi) |
| { |
| struct kvm_irq_ack_notifier *kian; |
| struct hlist_node *n; |
| |
| hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link) |
| if (kian->gsi == gsi) |
| kian->irq_acked(kian); |
| } |
| |
| void kvm_register_irq_ack_notifier(struct kvm *kvm, |
| struct kvm_irq_ack_notifier *kian) |
| { |
| hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list); |
| } |
| |
| void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian) |
| { |
| hlist_del_init(&kian->link); |
| } |
| |
| /* The caller must hold kvm->lock mutex */ |
| int kvm_request_irq_source_id(struct kvm *kvm) |
| { |
| unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; |
| int irq_source_id = find_first_zero_bit(bitmap, |
| sizeof(kvm->arch.irq_sources_bitmap)); |
| if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
| printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); |
| irq_source_id = -EFAULT; |
| } else |
| set_bit(irq_source_id, bitmap); |
| return irq_source_id; |
| } |
| |
| void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) |
| { |
| int i; |
| |
| if (irq_source_id <= 0 || |
| irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) { |
| printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); |
| return; |
| } |
| for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) |
| clear_bit(irq_source_id, &kvm->arch.irq_states[i]); |
| clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); |
| } |