arch/x86/include/asm/irq_remapping.h

   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 enum {
  37         IRQ_REMAP_XAPIC_MODE,
  38         IRQ_REMAP_X2APIC_MODE,
  39 };
  40
  41 struct vcpu_data {
  42         u64 pi_desc_addr;       /* Physical address of PI Descriptor */
  43         u32 vector;             /* Guest vector of the interrupt */
  44 };
  45
  46 #ifdef CONFIG_IRQ_REMAP
  47
  48 extern bool irq_remapping_cap(enum irq_remap_cap cap);
  49 extern void set_irq_remapping_broken(void);
  50 extern int irq_remapping_prepare(void);
  51 extern int irq_remapping_enable(void);
  52 extern void irq_remapping_disable(void);
  53 extern int irq_remapping_reenable(int);
  54 extern int irq_remap_enable_fault_handling(void);
  55 extern void panic_if_irq_remap(const char *msg);
  56
  57 extern struct irq_domain *
  58 irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info);
  59 extern struct irq_domain *
  60 irq_remapping_get_irq_domain(struct irq_alloc_info *info);
  61
  62 /* Create PCI MSI/MSIx irqdomain, use @parent as the parent irqdomain. */
  63 extern struct irq_domain *
  64 arch_create_remap_msi_irq_domain(struct irq_domain *par, const char *n, int id);
  65
  66 /* Get parent irqdomain for interrupt remapping irqdomain */
  67 static inline struct irq_domain *arch_get_ir_parent_domain(void)
  68 {
  69         return x86_vector_domain;
  70 }
  71
  72 #else  /* CONFIG_IRQ_REMAP */
  73
  74 static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; }
  75 static inline void set_irq_remapping_broken(void) { }
  76 static inline int irq_remapping_prepare(void) { return -ENODEV; }
  77 static inline int irq_remapping_enable(void) { return -ENODEV; }
  78 static inline void irq_remapping_disable(void) { }
  79 static inline int irq_remapping_reenable(int eim) { return -ENODEV; }
  80 static inline int irq_remap_enable_fault_handling(void) { return -ENODEV; }
  81
  82 static inline void panic_if_irq_remap(const char *msg)
  83 {
  84 }
  85
  86 static inline struct irq_domain *
  87 irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
  88 {
  89         return NULL;
  90 }
  91
  92 static inline struct irq_domain *
  93 irq_remapping_get_irq_domain(struct irq_alloc_info *info)
  94 {
  95         return NULL;
  96 }
  97
  98 #endif /* CONFIG_IRQ_REMAP */
  99 #endif /* __X86_IRQ_REMAPPING_H */