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 
17 struct msi_msg;
18 struct irq_alloc_info;
19 
20 enum irq_remap_cap {
21 	IRQ_POSTING_CAP = 0,
22 };
23 
24 enum {
25 	IRQ_REMAP_XAPIC_MODE,
26 	IRQ_REMAP_X2APIC_MODE,
27 };
28 
29 struct vcpu_data {
30 	u64 pi_desc_addr;	/* Physical address of PI Descriptor */
31 	u32 vector;		/* Guest vector of the interrupt */
32 };
33 
34 #ifdef CONFIG_IRQ_REMAP
35 
36 extern raw_spinlock_t irq_2_ir_lock;
37 
38 extern bool irq_remapping_cap(enum irq_remap_cap cap);
39 extern void set_irq_remapping_broken(void);
40 extern int irq_remapping_prepare(void);
41 extern int irq_remapping_enable(void);
42 extern void irq_remapping_disable(void);
43 extern int irq_remapping_reenable(int);
44 extern int irq_remap_enable_fault_handling(void);
45 extern void panic_if_irq_remap(const char *msg);
46 
47 extern struct irq_domain *
48 irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info);
49 extern struct irq_domain *
50 irq_remapping_get_irq_domain(struct irq_alloc_info *info);
51 
52 /* Create PCI MSI/MSIx irqdomain, use @parent as the parent irqdomain. */
53 extern struct irq_domain *
54 arch_create_remap_msi_irq_domain(struct irq_domain *par, const char *n, int id);
55 
56 /* Get parent irqdomain for interrupt remapping irqdomain */
57 static inline struct irq_domain *arch_get_ir_parent_domain(void)
58 {
59 	return x86_vector_domain;
60 }
61 
62 #else  /* CONFIG_IRQ_REMAP */
63 
64 static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }
65 static inline void set_irq_remapping_broken(void) { }
66 static inline int irq_remapping_prepare(void) { return -ENODEV; }
67 static inline int irq_remapping_enable(void) { return -ENODEV; }
68 static inline void irq_remapping_disable(void) { }
69 static inline int irq_remapping_reenable(int eim) { return -ENODEV; }
70 static inline int irq_remap_enable_fault_handling(void) { return -ENODEV; }
71 
72 static inline void panic_if_irq_remap(const char *msg)
73 {
74 }
75 
76 static inline struct irq_domain *
77 irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
78 {
79 	return NULL;
80 }
81 
82 static inline struct irq_domain *
83 irq_remapping_get_irq_domain(struct irq_alloc_info *info)
84 {
85 	return NULL;
86 }
87 
88 #endif /* CONFIG_IRQ_REMAP */
89 #endif /* __X86_IRQ_REMAPPING_H */
90