1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <joerg.roedel@amd.com>
5 *
6 * This header file contains the interface of the interrupt remapping code to
7 * the x86 interrupt management code.
8 */
9
10#ifndef __X86_IRQ_REMAPPING_H
11#define __X86_IRQ_REMAPPING_H
12
13#include <asm/irqdomain.h>
14#include <asm/hw_irq.h>
15#include <asm/io_apic.h>
16
17struct msi_msg;
18struct irq_alloc_info;
19
20enum irq_remap_cap {
21 IRQ_POSTING_CAP = 0,
22};
23
24enum {
25 IRQ_REMAP_XAPIC_MODE,
26 IRQ_REMAP_X2APIC_MODE,
27};
28
29/*
30 * This is mainly used to communicate information back-and-forth
31 * between SVM and IOMMU for setting up and tearing down posted
32 * interrupt
33 */
34struct amd_iommu_pi_data {
35 u64 vapic_addr; /* Physical address of the vCPU's vAPIC. */
36 u32 ga_tag;
37 u32 vector; /* Guest vector of the interrupt */
38 int cpu;
39 bool ga_log_intr;
40 bool is_guest_mode;
41 void *ir_data;
42};
43
44struct intel_iommu_pi_data {
45 u64 pi_desc_addr; /* Physical address of PI Descriptor */
46 u32 vector; /* Guest vector of the interrupt */
47};
48
49#ifdef CONFIG_IRQ_REMAP
50
51extern raw_spinlock_t irq_2_ir_lock;
52
53extern bool irq_remapping_cap(enum irq_remap_cap cap);
54extern void set_irq_remapping_broken(void);
55extern int irq_remapping_prepare(void);
56extern int irq_remapping_enable(void);
57extern void irq_remapping_disable(void);
58extern int irq_remapping_reenable(int);
59extern int irq_remap_enable_fault_handling(void);
60extern void panic_if_irq_remap(const char *msg);
61
62/* Get parent irqdomain for interrupt remapping irqdomain */
63static inline struct irq_domain *arch_get_ir_parent_domain(void)
64{
65 return x86_vector_domain;
66}
67
68extern bool enable_posted_msi;
69
70static inline bool posted_msi_supported(void)
71{
72 return enable_posted_msi && irq_remapping_cap(cap: IRQ_POSTING_CAP);
73}
74
75#else /* CONFIG_IRQ_REMAP */
76
77static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }
78static inline void set_irq_remapping_broken(void) { }
79static inline int irq_remapping_prepare(void) { return -ENODEV; }
80static inline int irq_remapping_enable(void) { return -ENODEV; }
81static inline void irq_remapping_disable(void) { }
82static inline int irq_remapping_reenable(int eim) { return -ENODEV; }
83static inline int irq_remap_enable_fault_handling(void) { return -ENODEV; }
84
85static inline void panic_if_irq_remap(const char *msg)
86{
87}
88
89#endif /* CONFIG_IRQ_REMAP */
90
91#ifdef CONFIG_X86_POSTED_MSI
92void intel_ack_posted_msi_irq(struct irq_data *irqd);
93#else
94#define intel_ack_posted_msi_irq NULL
95#endif
96
97#endif /* __X86_IRQ_REMAPPING_H */
98

source code of linux/arch/x86/include/asm/irq_remapping.h