/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Advanced Micro Devices, Inc.
 * Author: Joerg Roedel <joerg.roedel@amd.com>
 *
 * This header file contains the interface of the interrupt remapping code to
 * the x86 interrupt management code.
 */

#ifndef __X86_IRQ_REMAPPING_H
#define __X86_IRQ_REMAPPING_H

#include <asm/irqdomain.h>
#include <asm/hw_irq.h>
#include <asm/io_apic.h>

struct msi_msg;
struct irq_alloc_info;

enum irq_remap_cap {
        IRQ_POSTING_CAP = 0,
};

enum {
        IRQ_REMAP_XAPIC_MODE,
        IRQ_REMAP_X2APIC_MODE,
};

/*
 * This is mainly used to communicate information back-and-forth
 * between SVM and IOMMU for setting up and tearing down posted
 * interrupt
 */
struct amd_iommu_pi_data {
        u64 vapic_addr;         /* Physical address of the vCPU's vAPIC. */
        u32 ga_tag;
        u32 vector;             /* Guest vector of the interrupt */
        int cpu;
        bool ga_log_intr;
        bool is_guest_mode;
        void *ir_data;
};

struct intel_iommu_pi_data {
        u64 pi_desc_addr;       /* Physical address of PI Descriptor */
        u32 vector;             /* Guest vector of the interrupt */
};

#ifdef CONFIG_IRQ_REMAP

extern raw_spinlock_t irq_2_ir_lock;

extern bool irq_remapping_cap(enum irq_remap_cap cap);
extern void set_irq_remapping_broken(void);
extern int irq_remapping_prepare(void);
extern int irq_remapping_enable(void);
extern void irq_remapping_disable(void);
extern int irq_remapping_reenable(int);
extern int irq_remap_enable_fault_handling(void);
extern void panic_if_irq_remap(const char *msg);

/* Get parent irqdomain for interrupt remapping irqdomain */
static inline struct irq_domain *arch_get_ir_parent_domain(void)
{
        return x86_vector_domain;
}

extern bool enable_posted_msi;

static inline bool posted_msi_enabled(void)
{
        return IS_ENABLED(CONFIG_X86_POSTED_MSI) &&
                enable_posted_msi && irq_remapping_cap(IRQ_POSTING_CAP);
}

#else  /* CONFIG_IRQ_REMAP */

static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }
static inline void set_irq_remapping_broken(void) { }
static inline int irq_remapping_prepare(void) { return -ENODEV; }
static inline int irq_remapping_enable(void) { return -ENODEV; }
static inline void irq_remapping_disable(void) { }
static inline int irq_remapping_reenable(int eim) { return -ENODEV; }
static inline int irq_remap_enable_fault_handling(void) { return -ENODEV; }

static inline void panic_if_irq_remap(const char *msg)
{
}

#endif /* CONFIG_IRQ_REMAP */

#ifdef CONFIG_X86_POSTED_MSI
void intel_ack_posted_msi_irq(struct irq_data *irqd);
#else
#define intel_ack_posted_msi_irq        NULL
#endif

#endif /* __X86_IRQ_REMAPPING_H */