linux/drivers/iommu/irq_remapping.c
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   1#include <linux/kernel.h>
   2#include <linux/string.h>
   3#include <linux/cpumask.h>
   4#include <linux/errno.h>
   5#include <linux/msi.h>
   6
   7#include <asm/hw_irq.h>
   8#include <asm/irq_remapping.h>
   9
  10#include "irq_remapping.h"
  11
  12int irq_remapping_enabled;
  13
  14int disable_irq_remap;
  15int disable_sourceid_checking;
  16int no_x2apic_optout;
  17
  18static struct irq_remap_ops *remap_ops;
  19
  20static __init int setup_nointremap(char *str)
  21{
  22        disable_irq_remap = 1;
  23        return 0;
  24}
  25early_param("nointremap", setup_nointremap);
  26
  27static __init int setup_irqremap(char *str)
  28{
  29        if (!str)
  30                return -EINVAL;
  31
  32        while (*str) {
  33                if (!strncmp(str, "on", 2))
  34                        disable_irq_remap = 0;
  35                else if (!strncmp(str, "off", 3))
  36                        disable_irq_remap = 1;
  37                else if (!strncmp(str, "nosid", 5))
  38                        disable_sourceid_checking = 1;
  39                else if (!strncmp(str, "no_x2apic_optout", 16))
  40                        no_x2apic_optout = 1;
  41
  42                str += strcspn(str, ",");
  43                while (*str == ',')
  44                        str++;
  45        }
  46
  47        return 0;
  48}
  49early_param("intremap", setup_irqremap);
  50
  51void __init setup_irq_remapping_ops(void)
  52{
  53        remap_ops = &intel_irq_remap_ops;
  54
  55#ifdef CONFIG_AMD_IOMMU
  56        if (amd_iommu_irq_ops.prepare() == 0)
  57                remap_ops = &amd_iommu_irq_ops;
  58#endif
  59}
  60
  61int irq_remapping_supported(void)
  62{
  63        if (disable_irq_remap)
  64                return 0;
  65
  66        if (!remap_ops || !remap_ops->supported)
  67                return 0;
  68
  69        return remap_ops->supported();
  70}
  71
  72int __init irq_remapping_prepare(void)
  73{
  74        if (!remap_ops || !remap_ops->prepare)
  75                return -ENODEV;
  76
  77        return remap_ops->prepare();
  78}
  79
  80int __init irq_remapping_enable(void)
  81{
  82        if (!remap_ops || !remap_ops->enable)
  83                return -ENODEV;
  84
  85        return remap_ops->enable();
  86}
  87
  88void irq_remapping_disable(void)
  89{
  90        if (!remap_ops || !remap_ops->disable)
  91                return;
  92
  93        remap_ops->disable();
  94}
  95
  96int irq_remapping_reenable(int mode)
  97{
  98        if (!remap_ops || !remap_ops->reenable)
  99                return 0;
 100
 101        return remap_ops->reenable(mode);
 102}
 103
 104int __init irq_remap_enable_fault_handling(void)
 105{
 106        if (!remap_ops || !remap_ops->enable_faulting)
 107                return -ENODEV;
 108
 109        return remap_ops->enable_faulting();
 110}
 111
 112int setup_ioapic_remapped_entry(int irq,
 113                                struct IO_APIC_route_entry *entry,
 114                                unsigned int destination, int vector,
 115                                struct io_apic_irq_attr *attr)
 116{
 117        if (!remap_ops || !remap_ops->setup_ioapic_entry)
 118                return -ENODEV;
 119
 120        return remap_ops->setup_ioapic_entry(irq, entry, destination,
 121                                             vector, attr);
 122}
 123
 124int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 125                              bool force)
 126{
 127        if (!config_enabled(CONFIG_SMP) || !remap_ops ||
 128            !remap_ops->set_affinity)
 129                return 0;
 130
 131        return remap_ops->set_affinity(data, mask, force);
 132}
 133
 134void free_remapped_irq(int irq)
 135{
 136        if (!remap_ops || !remap_ops->free_irq)
 137                return;
 138
 139        remap_ops->free_irq(irq);
 140}
 141
 142void compose_remapped_msi_msg(struct pci_dev *pdev,
 143                              unsigned int irq, unsigned int dest,
 144                              struct msi_msg *msg, u8 hpet_id)
 145{
 146        if (!remap_ops || !remap_ops->compose_msi_msg)
 147                return;
 148
 149        remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 150}
 151
 152int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
 153{
 154        if (!remap_ops || !remap_ops->msi_alloc_irq)
 155                return -ENODEV;
 156
 157        return remap_ops->msi_alloc_irq(pdev, irq, nvec);
 158}
 159
 160int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
 161                           int index, int sub_handle)
 162{
 163        if (!remap_ops || !remap_ops->msi_setup_irq)
 164                return -ENODEV;
 165
 166        return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
 167}
 168
 169int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 170{
 171        if (!remap_ops || !remap_ops->setup_hpet_msi)
 172                return -ENODEV;
 173
 174        return remap_ops->setup_hpet_msi(irq, id);
 175}
 176
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