drivers/iommu/irq_remapping.c

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