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 irq_remap_broken;
  36extern int disable_sourceid_checking;
  37extern int no_x2apic_optout;
  38extern int irq_remapping_enabled;
  39
  40struct irq_remap_ops {
  41        /* Check whether Interrupt Remapping is supported */
  42        int (*supported)(void);
  43
  44        /* Initializes hardware and makes it ready for remapping interrupts */
  45        int  (*prepare)(void);
  46
  47        /* Enables the remapping hardware */
  48        int  (*enable)(void);
  49
  50        /* Disables the remapping hardware */
  51        void (*disable)(void);
  52
  53        /* Reenables the remapping hardware */
  54        int  (*reenable)(int);
  55
  56        /* Enable fault handling */
  57        int  (*enable_faulting)(void);
  58
  59        /* IO-APIC setup routine */
  60        int (*setup_ioapic_entry)(int irq, struct IO_APIC_route_entry *,
  61                                  unsigned int, int,
  62                                  struct io_apic_irq_attr *);
  63
  64        /* Set the CPU affinity of a remapped interrupt */
  65        int (*set_affinity)(struct irq_data *data, const struct cpumask *mask,
  66                            bool force);
  67
  68        /* Free an IRQ */
  69        int (*free_irq)(int);
  70
  71        /* Create MSI msg to use for interrupt remapping */
  72        void (*compose_msi_msg)(struct pci_dev *,
  73                                unsigned int, unsigned int,
  74                                struct msi_msg *, u8);
  75
  76        /* Allocate remapping resources for MSI */
  77        int (*msi_alloc_irq)(struct pci_dev *, int, int);
  78
  79        /* Setup the remapped MSI irq */
  80        int (*msi_setup_irq)(struct pci_dev *, unsigned int, int, int);
  81
  82        /* Setup interrupt remapping for an HPET MSI */
  83        int (*setup_hpet_msi)(unsigned int, unsigned int);
  84};
  85
  86extern struct irq_remap_ops intel_irq_remap_ops;
  87extern struct irq_remap_ops amd_iommu_irq_ops;
  88
  89#else  /* CONFIG_IRQ_REMAP */
  90
  91#define irq_remapping_enabled 0
  92#define disable_irq_remap     1
  93#define irq_remap_broken      0
  94
  95#endif /* CONFIG_IRQ_REMAP */
  96
  97#endif /* __IRQ_REMAPPING_H */
  98
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