/* * 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"); return -EFAULT; } ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); 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; ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); 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); }