drivers/iommu/irq_remapping.c

   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
  12 int irq_remapping_enabled;
  13
  14 int disable_irq_remap;
  15 int disable_sourceid_checking;
  16 int no_x2apic_optout;
  17
  18 static struct irq_remap_ops *remap_ops;
  19
  20 static __init int setup_nointremap(char *str)
  21 {
  22         disable_irq_remap = 1;
  23         return 0;
  24 }
  25 early_param("nointremap", setup_nointremap);
  26
  27 static __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 }
  49 early_param("intremap", setup_irqremap);
  50
  51 void __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
  61 int 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
  72 int __init irq_remapping_prepare(void)
  73 {
  74         if (!remap_ops || !remap_ops->prepare)
  75                 return -ENODEV;
  76
  77         return remap_ops->prepare();
  78 }
  79
  80 int __init irq_remapping_enable(void)
  81 {
  82         if (!remap_ops || !remap_ops->enable)
  83                 return -ENODEV;
  84
  85         return remap_ops->enable();
  86 }
  87
  88 void irq_remapping_disable(void)
  89 {
  90         if (!remap_ops || !remap_ops->disable)
  91                 return;
  92
  93         remap_ops->disable();
  94 }
  95
  96 int 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
 104 int __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
 112 int 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
 124 int 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
 134 void 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
 142 void 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
 152 int 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
 160 int 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
 169 int 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 }