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: c8ddb2713c624f432fa5fe3c7ecffcdda46ea0d4 authored by Linus Torvalds on 01 November 2010, 11:54:12 UTC
Linux 2.6.37-rc1
Linux 2.6.37-rc1
Tip revision: c8ddb27
dynamic.c
/*
* Dynamic IRQ management
*
* Copyright (C) 2010 Paul Mundt
*
* Modelled after arch/x86/kernel/apic/io_apic.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.
*/
#define pr_fmt(fmt) "intc: " fmt
#include <linux/irq.h>
#include <linux/bitmap.h>
#include <linux/spinlock.h>
#include "internals.h" /* only for activate_irq() damage.. */
/*
* The IRQ bitmap provides a global map of bound IRQ vectors for a
* given platform. Allocation of IRQs are either static through the CPU
* vector map, or dynamic in the case of board mux vectors or MSI.
*
* As this is a central point for all IRQ controllers on the system,
* each of the available sources are mapped out here. This combined with
* sparseirq makes it quite trivial to keep the vector map tightly packed
* when dynamically creating IRQs, as well as tying in to otherwise
* unused irq_desc positions in the sparse array.
*/
/*
* Dynamic IRQ allocation and deallocation
*/
unsigned int create_irq_nr(unsigned int irq_want, int node)
{
int irq = irq_alloc_desc_at(irq_want, node);
if (irq < 0)
return 0;
activate_irq(irq);
return irq;
}
int create_irq(void)
{
int irq = irq_alloc_desc(numa_node_id());
if (irq >= 0)
activate_irq(irq);
return irq;
}
void destroy_irq(unsigned int irq)
{
irq_free_desc(irq);
}
void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs)
{
int i;
for (i = 0; i < nr_vecs; i++)
irq_reserve_irqs(evt2irq(vectors[i].vect), 1);
}