https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 0173a3265b228da319ceb9c1ec6a5682fd1b2d92 authored by Linus Torvalds on 26 October 2008, 19:13:29 UTC
Linux 2.6.28-rc2
Linux 2.6.28-rc2
Tip revision: 0173a32
uv_irq.c
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* SGI UV IRQ functions
*
* Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
*/
#include <linux/module.h>
#include <linux/irq.h>
#include <asm/apic.h>
#include <asm/uv/uv_irq.h>
static void uv_noop(unsigned int irq)
{
}
static unsigned int uv_noop_ret(unsigned int irq)
{
return 0;
}
static void uv_ack_apic(unsigned int irq)
{
ack_APIC_irq();
}
struct irq_chip uv_irq_chip = {
.name = "UV-CORE",
.startup = uv_noop_ret,
.shutdown = uv_noop,
.enable = uv_noop,
.disable = uv_noop,
.ack = uv_noop,
.mask = uv_noop,
.unmask = uv_noop,
.eoi = uv_ack_apic,
.end = uv_noop,
};
/*
* Set up a mapping of an available irq and vector, and enable the specified
* MMR that defines the MSI that is to be sent to the specified CPU when an
* interrupt is raised.
*/
int uv_setup_irq(char *irq_name, int cpu, int mmr_blade,
unsigned long mmr_offset)
{
int irq;
int ret;
irq = create_irq();
if (irq <= 0)
return -EBUSY;
ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset);
if (ret != irq)
destroy_irq(irq);
return ret;
}
EXPORT_SYMBOL_GPL(uv_setup_irq);
/*
* Tear down a mapping of an irq and vector, and disable the specified MMR that
* defined the MSI that was to be sent to the specified CPU when an interrupt
* was raised.
*
* Set mmr_blade and mmr_offset to what was passed in on uv_setup_irq().
*/
void uv_teardown_irq(unsigned int irq, int mmr_blade, unsigned long mmr_offset)
{
arch_disable_uv_irq(mmr_blade, mmr_offset);
destroy_irq(irq);
}
EXPORT_SYMBOL_GPL(uv_teardown_irq);