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
  56 int irq_remapping_supported(void)
  57 {
  58         if (disable_irq_remap)
  59                 return 0;
  60
  61         if (!remap_ops || !remap_ops->supported)
  62                 return 0;
  63
  64         return remap_ops->supported();
  65 }
  66
  67 int __init irq_remapping_prepare(void)
  68 {
  69         if (!remap_ops || !remap_ops->prepare)
  70                 return -ENODEV;
  71
  72         return remap_ops->prepare();
  73 }
  74
  75 int __init irq_remapping_enable(void)
  76 {
  77         if (!remap_ops || !remap_ops->enable)
  78                 return -ENODEV;
  79
  80         return remap_ops->enable();
  81 }
  82
  83 void irq_remapping_disable(void)
  84 {
  85         if (!remap_ops || !remap_ops->disable)
  86                 return;
  87
  88         remap_ops->disable();
  89 }
  90
  91 int irq_remapping_reenable(int mode)
  92 {
  93         if (!remap_ops || !remap_ops->reenable)
  94                 return 0;
  95
  96         return remap_ops->reenable(mode);
  97 }
  98
  99 int __init irq_remap_enable_fault_handling(void)
 100 {
 101         if (!remap_ops || !remap_ops->enable_faulting)
 102                 return -ENODEV;
 103
 104         return remap_ops->enable_faulting();
 105 }
 106
 107 int setup_ioapic_remapped_entry(int irq,
 108                                 struct IO_APIC_route_entry *entry,
 109                                 unsigned int destination, int vector,
 110                                 struct io_apic_irq_attr *attr)
 111 {
 112         if (!remap_ops || !remap_ops->setup_ioapic_entry)
 113                 return -ENODEV;
 114
 115         return remap_ops->setup_ioapic_entry(irq, entry, destination,
 116                                              vector, attr);
 117 }
 118
 119 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 120                               bool force)
 121 {
 122         if (!config_enabled(CONFIG_SMP) || !remap_ops ||
 123             !remap_ops->set_affinity)
 124                 return 0;
 125
 126         return remap_ops->set_affinity(data, mask, force);
 127 }
 128
 129 void free_remapped_irq(int irq)
 130 {
 131         if (!remap_ops || !remap_ops->free_irq)
 132                 return;
 133
 134         remap_ops->free_irq(irq);
 135 }
 136
 137 void compose_remapped_msi_msg(struct pci_dev *pdev,
 138                               unsigned int irq, unsigned int dest,
 139                               struct msi_msg *msg, u8 hpet_id)
 140 {
 141         if (!remap_ops || !remap_ops->compose_msi_msg)
 142                 return;
 143
 144         remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 145 }
 146
 147 int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
 148 {
 149         if (!remap_ops || !remap_ops->msi_alloc_irq)
 150                 return -ENODEV;
 151
 152         return remap_ops->msi_alloc_irq(pdev, irq, nvec);
 153 }
 154
 155 int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
 156                            int index, int sub_handle)
 157 {
 158         if (!remap_ops || !remap_ops->msi_setup_irq)
 159                 return -ENODEV;
 160
 161         return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
 162 }
 163
 164 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 165 {
 166         if (!remap_ops || !remap_ops->setup_hpet_msi)
 167                 return -ENODEV;
 168
 169         return remap_ops->setup_hpet_msi(irq, id);
 170 }