linux/arch/x86/platform/uv/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/export.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
#include <linux/irq.h>

#include <asm/irqdomain.h>
#include <asm/apic.h>
#include <asm/uv/uv_irq.h>
#include <asm/uv/uv_hub.h>

/* MMR offset and pnode of hub sourcing interrupts for a given irq */
struct uv_irq_2_mmr_pnode { … };

static void uv_program_mmr(struct irq_cfg *cfg, struct uv_irq_2_mmr_pnode *info)
{ … }

static void uv_noop(struct irq_data *data) { … }

static int
uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
		    bool force)
{ … }

static struct irq_chip uv_irq_chip = …;

static int uv_domain_alloc(struct irq_domain *domain, unsigned int virq,
			   unsigned int nr_irqs, void *arg)
{ … }

static void uv_domain_free(struct irq_domain *domain, unsigned int virq,
			   unsigned int nr_irqs)
{ … }

/*
 * Re-target the irq to the specified CPU and enable the specified MMR located
 * on the specified blade to allow the sending of MSIs to the specified CPU.
 */
static int uv_domain_activate(struct irq_domain *domain,
			      struct irq_data *irq_data, bool reserve)
{ … }

/*
 * Disable the specified MMR located on the specified blade so that MSIs are
 * longer allowed to be sent.
 */
static void uv_domain_deactivate(struct irq_domain *domain,
				 struct irq_data *irq_data)
{ … }

static const struct irq_domain_ops uv_domain_ops = …;

static struct irq_domain *uv_get_irq_domain(void)
{ … }

/*
 * 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 limit)
{ … }
EXPORT_SYMBOL_GPL(…);

/*
 * 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)
{ … }
EXPORT_SYMBOL_GPL(…);