1 /*
2 * Copyright (C) 2012 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * This header file contains the interface of the interrupt remapping code to
19 * the x86 interrupt management code.
20 */
21
22 #ifndef __X86_IRQ_REMAPPING_H
23 #define __X86_IRQ_REMAPPING_H
24
25 #include <asm/irqdomain.h>
26 #include <asm/hw_irq.h>
27 #include <asm/io_apic.h>
28
29 struct msi_msg;
30 struct irq_alloc_info;
31
32 enum irq_remap_cap {
33 IRQ_POSTING_CAP = 0,
34 };
35
36 struct vcpu_data {
37 u64 pi_desc_addr; /* Physical address of PI Descriptor */
38 u32 vector; /* Guest vector of the interrupt */
39 };
40
41 #ifdef CONFIG_IRQ_REMAP
42
43 extern bool irq_remapping_cap(enum irq_remap_cap cap);
44 extern void set_irq_remapping_broken(void);
45 extern int irq_remapping_prepare(void);
46 extern int irq_remapping_enable(void);
47 extern void irq_remapping_disable(void);
48 extern int irq_remapping_reenable(int);
49 extern int irq_remap_enable_fault_handling(void);
50 extern void panic_if_irq_remap(const char *msg);
51
52 extern struct irq_domain *
53 irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info);
54 extern struct irq_domain *
55 irq_remapping_get_irq_domain(struct irq_alloc_info *info);
56
57 /* Create PCI MSI/MSIx irqdomain, use @parent as the parent irqdomain. */
58 extern struct irq_domain *arch_create_msi_irq_domain(struct irq_domain *parent);
59
60 /* Get parent irqdomain for interrupt remapping irqdomain */
arch_get_ir_parent_domain(void)61 static inline struct irq_domain *arch_get_ir_parent_domain(void)
62 {
63 return x86_vector_domain;
64 }
65
66 #else /* CONFIG_IRQ_REMAP */
67
irq_remapping_cap(enum irq_remap_cap cap)68 static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }
set_irq_remapping_broken(void)69 static inline void set_irq_remapping_broken(void) { }
irq_remapping_prepare(void)70 static inline int irq_remapping_prepare(void) { return -ENODEV; }
irq_remapping_enable(void)71 static inline int irq_remapping_enable(void) { return -ENODEV; }
irq_remapping_disable(void)72 static inline void irq_remapping_disable(void) { }
irq_remapping_reenable(int eim)73 static inline int irq_remapping_reenable(int eim) { return -ENODEV; }
irq_remap_enable_fault_handling(void)74 static inline int irq_remap_enable_fault_handling(void) { return -ENODEV; }
75
panic_if_irq_remap(const char * msg)76 static inline void panic_if_irq_remap(const char *msg)
77 {
78 }
79
80 static inline struct irq_domain *
irq_remapping_get_ir_irq_domain(struct irq_alloc_info * info)81 irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
82 {
83 return NULL;
84 }
85
86 static inline struct irq_domain *
irq_remapping_get_irq_domain(struct irq_alloc_info * info)87 irq_remapping_get_irq_domain(struct irq_alloc_info *info)
88 {
89 return NULL;
90 }
91
92 #endif /* CONFIG_IRQ_REMAP */
93 #endif /* __X86_IRQ_REMAPPING_H */
94