xref: /linux/arch/x86/include/asm/irq_remapping.h (revision 621cde16e49b3ecf7d59a8106a20aaebfb4a59a9)
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 /* Get parent irqdomain for interrupt remapping irqdomain */
arch_get_ir_parent_domain(void)48 static inline struct irq_domain *arch_get_ir_parent_domain(void)
49 {
50 	return x86_vector_domain;
51 }
52 
53 extern bool enable_posted_msi;
54 
posted_msi_supported(void)55 static inline bool posted_msi_supported(void)
56 {
57 	return enable_posted_msi && irq_remapping_cap(IRQ_POSTING_CAP);
58 }
59 
60 #else  /* CONFIG_IRQ_REMAP */
61 
irq_remapping_cap(enum irq_remap_cap cap)62 static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }
set_irq_remapping_broken(void)63 static inline void set_irq_remapping_broken(void) { }
irq_remapping_prepare(void)64 static inline int irq_remapping_prepare(void) { return -ENODEV; }
irq_remapping_enable(void)65 static inline int irq_remapping_enable(void) { return -ENODEV; }
irq_remapping_disable(void)66 static inline void irq_remapping_disable(void) { }
irq_remapping_reenable(int eim)67 static inline int irq_remapping_reenable(int eim) { return -ENODEV; }
irq_remap_enable_fault_handling(void)68 static inline int irq_remap_enable_fault_handling(void) { return -ENODEV; }
69 
panic_if_irq_remap(const char * msg)70 static inline void panic_if_irq_remap(const char *msg)
71 {
72 }
73 
74 #endif /* CONFIG_IRQ_REMAP */
75 #endif /* __X86_IRQ_REMAPPING_H */
76