linux/drivers/iommu/hyperv-iommu.c

// SPDX-License-Identifier: GPL-2.0

/*
 * Hyper-V stub IOMMU driver.
 *
 * Copyright (C) 2019, Microsoft, Inc.
 *
 * Author : Lan Tianyu <[email protected]>
 */

#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/iommu.h>
#include <linux/module.h>

#include <asm/apic.h>
#include <asm/cpu.h>
#include <asm/hw_irq.h>
#include <asm/io_apic.h>
#include <asm/irq_remapping.h>
#include <asm/hypervisor.h>
#include <asm/mshyperv.h>

#include "irq_remapping.h"

#ifdef CONFIG_IRQ_REMAP

/*
 * According 82093AA IO-APIC spec , IO APIC has a 24-entry Interrupt
 * Redirection Table. Hyper-V exposes one single IO-APIC and so define
 * 24 IO APIC remmapping entries.
 */
#define IOAPIC_REMAPPING_ENTRY …

static cpumask_t ioapic_max_cpumask = …;
static struct irq_domain *ioapic_ir_domain;

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

static struct irq_chip hyperv_ir_chip = …;

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

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

static int hyperv_irq_remapping_select(struct irq_domain *d,
				       struct irq_fwspec *fwspec,
				       enum irq_domain_bus_token bus_token)
{ … }

static const struct irq_domain_ops hyperv_ir_domain_ops = …;

static const struct irq_domain_ops hyperv_root_ir_domain_ops;
static int __init hyperv_prepare_irq_remapping(void)
{ … }

static int __init hyperv_enable_irq_remapping(void)
{ … }

struct irq_remap_ops hyperv_irq_remap_ops = …;

/* IRQ remapping domain when Linux runs as the root partition */
struct hyperv_root_ir_data { … };

static void
hyperv_root_ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg)
{ … }

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

static struct irq_chip hyperv_root_ir_chip = …;

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

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

static const struct irq_domain_ops hyperv_root_ir_domain_ops = …;

#endif