mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 09:16:38 +07:00
5550af4df1
Every call of kvm_set_irq() should offer an irq_source_id, which is
allocated by kvm_request_irq_source_id(). Based on irq_source_id, we
identify the irq source and implement logical OR for shared level
interrupts.
The allocated irq_source_id can be freed by kvm_free_irq_source_id().
Currently, we support at most sizeof(unsigned long) different irq sources.
[Amit: - rebase to kvm.git HEAD
- move definition of KVM_USERSPACE_IRQ_SOURCE_ID to common file
- move kvm_request_irq_source_id to the update_irq ioctl]
[Xiantao: - Add kvm/ia64 stuff and make it work for kvm/ia64 guests]
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*
|
|
* 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 *kvm,
|
|
struct kvm_irq_ack_notifier *kian)
|
|
{
|
|
hlist_del(&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);
|
|
}
|