linux/drivers/iommu/irq_remapping.h
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   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 stuff that is shared between different interrupt
  19 * remapping drivers but with no need to be visible outside of the IOMMU layer.
  20 */
  21
  22#ifndef __IRQ_REMAPPING_H
  23#define __IRQ_REMAPPING_H
  24
  25#ifdef CONFIG_IRQ_REMAP
  26
  27struct IO_APIC_route_entry;
  28struct io_apic_irq_attr;
  29struct irq_data;
  30struct cpumask;
  31struct pci_dev;
  32struct msi_msg;
  33
  34extern int disable_irq_remap;
  35extern int disable_sourceid_checking;
  36extern int no_x2apic_optout;
  37extern int irq_remapping_enabled;
  38
  39struct irq_remap_ops {
  40        /* Check whether Interrupt Remapping is supported */
  41        int (*supported)(void);
  42
  43        /* Initializes hardware and makes it ready for remapping interrupts */
  44        int  (*prepare)(void);
  45
  46        /* Enables the remapping hardware */
  47        int  (*enable)(void);
  48
  49        /* Disables the remapping hardware */
  50        void (*disable)(void);
  51
  52        /* Reenables the remapping hardware */
  53        int  (*reenable)(int);
  54
  55        /* Enable fault handling */
  56        int  (*enable_faulting)(void);
  57
  58        /* IO-APIC setup routine */
  59        int (*setup_ioapic_entry)(int irq, struct IO_APIC_route_entry *,
  60                                  unsigned int, int,
  61                                  struct io_apic_irq_attr *);
  62
  63        /* Set the CPU affinity of a remapped interrupt */
  64        int (*set_affinity)(struct irq_data *data, const struct cpumask *mask,
  65                            bool force);
  66
  67        /* Free an IRQ */
  68        int (*free_irq)(int);
  69
  70        /* Create MSI msg to use for interrupt remapping */
  71        void (*compose_msi_msg)(struct pci_dev *,
  72                                unsigned int, unsigned int,
  73                                struct msi_msg *, u8);
  74
  75        /* Allocate remapping resources for MSI */
  76        int (*msi_alloc_irq)(struct pci_dev *, int, int);
  77
  78        /* Setup the remapped MSI irq */
  79        int (*msi_setup_irq)(struct pci_dev *, unsigned int, int, int);
  80
  81        /* Setup interrupt remapping for an HPET MSI */
  82        int (*setup_hpet_msi)(unsigned int, unsigned int);
  83};
  84
  85extern struct irq_remap_ops intel_irq_remap_ops;
  86extern struct irq_remap_ops amd_iommu_irq_ops;
  87
  88#else  /* CONFIG_IRQ_REMAP */
  89
  90#define irq_remapping_enabled 0
  91#define disable_irq_remap     1
  92
  93#endif /* CONFIG_IRQ_REMAP */
  94
  95#endif /* __IRQ_REMAPPING_H */
  96
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