arch/x86/include/asm/irq_remapping.h

   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 */