Pileus Git - ~andy/linux/blob - drivers/iommu/irq_remapping.c

   1 #include <linux/cpumask.h>
   2 #include <linux/kernel.h>
   3 #include <linux/string.h>
   4 #include <linux/cpumask.h>
   5 #include <linux/errno.h>
   6 #include <linux/msi.h>
   7
   8 #include <asm/hw_irq.h>
   9 #include <asm/irq_remapping.h>
  10 #include <asm/processor.h>
  11 #include <asm/x86_init.h>
  12 #include <asm/apic.h>
  13
  14 #include "irq_remapping.h"
  15
  16 int irq_remapping_enabled;
  17
  18 int disable_irq_remap;
  19 int disable_sourceid_checking;
  20 int no_x2apic_optout;
  21
  22 static struct irq_remap_ops *remap_ops;
  23
  24 static void irq_remapping_disable_io_apic(void)
  25 {
  26         /*
  27          * With interrupt-remapping, for now we will use virtual wire A
  28          * mode, as virtual wire B is little complex (need to configure
  29          * both IOAPIC RTE as well as interrupt-remapping table entry).
  30          * As this gets called during crash dump, keep this simple for
  31          * now.
  32          */
  33         if (cpu_has_apic || apic_from_smp_config())
  34                 disconnect_bsp_APIC(0);
  35 }
  36
  37 static void __init irq_remapping_modify_x86_ops(void)
  38 {
  39         x86_io_apic_ops.disable =       irq_remapping_disable_io_apic;
  40 }
  41
  42 static __init int setup_nointremap(char *str)
  43 {
  44         disable_irq_remap = 1;
  45         return 0;
  46 }
  47 early_param("nointremap", setup_nointremap);
  48
  49 static __init int setup_irqremap(char *str)
  50 {
  51         if (!str)
  52                 return -EINVAL;
  53
  54         while (*str) {
  55                 if (!strncmp(str, "on", 2))
  56                         disable_irq_remap = 0;
  57                 else if (!strncmp(str, "off", 3))
  58                         disable_irq_remap = 1;
  59                 else if (!strncmp(str, "nosid", 5))
  60                         disable_sourceid_checking = 1;
  61                 else if (!strncmp(str, "no_x2apic_optout", 16))
  62                         no_x2apic_optout = 1;
  63
  64                 str += strcspn(str, ",");
  65                 while (*str == ',')
  66                         str++;
  67         }
  68
  69         return 0;
  70 }
  71 early_param("intremap", setup_irqremap);
  72
  73 void __init setup_irq_remapping_ops(void)
  74 {
  75         remap_ops = &intel_irq_remap_ops;
  76
  77 #ifdef CONFIG_AMD_IOMMU
  78         if (amd_iommu_irq_ops.prepare() == 0)
  79                 remap_ops = &amd_iommu_irq_ops;
  80 #endif
  81 }
  82
  83 int irq_remapping_supported(void)
  84 {
  85         if (disable_irq_remap)
  86                 return 0;
  87
  88         if (!remap_ops || !remap_ops->supported)
  89                 return 0;
  90
  91         return remap_ops->supported();
  92 }
  93
  94 int __init irq_remapping_prepare(void)
  95 {
  96         if (!remap_ops || !remap_ops->prepare)
  97                 return -ENODEV;
  98
  99         return remap_ops->prepare();
 100 }
 101
 102 int __init irq_remapping_enable(void)
 103 {
 104         int ret;
 105
 106         if (!remap_ops || !remap_ops->enable)
 107                 return -ENODEV;
 108
 109         ret = remap_ops->enable();
 110
 111         if (irq_remapping_enabled)
 112                 irq_remapping_modify_x86_ops();
 113
 114         return ret;
 115 }
 116
 117 void irq_remapping_disable(void)
 118 {
 119         if (!irq_remapping_enabled ||
 120             !remap_ops ||
 121             !remap_ops->disable)
 122                 return;
 123
 124         remap_ops->disable();
 125 }
 126
 127 int irq_remapping_reenable(int mode)
 128 {
 129         if (!irq_remapping_enabled ||
 130             !remap_ops ||
 131             !remap_ops->reenable)
 132                 return 0;
 133
 134         return remap_ops->reenable(mode);
 135 }
 136
 137 int __init irq_remap_enable_fault_handling(void)
 138 {
 139         if (!irq_remapping_enabled)
 140                 return 0;
 141
 142         if (!remap_ops || !remap_ops->enable_faulting)
 143                 return -ENODEV;
 144
 145         return remap_ops->enable_faulting();
 146 }
 147
 148 int setup_ioapic_remapped_entry(int irq,
 149                                 struct IO_APIC_route_entry *entry,
 150                                 unsigned int destination, int vector,
 151                                 struct io_apic_irq_attr *attr)
 152 {
 153         if (!remap_ops || !remap_ops->setup_ioapic_entry)
 154                 return -ENODEV;
 155
 156         return remap_ops->setup_ioapic_entry(irq, entry, destination,
 157                                              vector, attr);
 158 }
 159
 160 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 161                               bool force)
 162 {
 163         if (!config_enabled(CONFIG_SMP) || !remap_ops ||
 164             !remap_ops->set_affinity)
 165                 return 0;
 166
 167         return remap_ops->set_affinity(data, mask, force);
 168 }
 169
 170 void free_remapped_irq(int irq)
 171 {
 172         if (!remap_ops || !remap_ops->free_irq)
 173                 return;
 174
 175         remap_ops->free_irq(irq);
 176 }
 177
 178 void compose_remapped_msi_msg(struct pci_dev *pdev,
 179                               unsigned int irq, unsigned int dest,
 180                               struct msi_msg *msg, u8 hpet_id)
 181 {
 182         if (!remap_ops || !remap_ops->compose_msi_msg)
 183                 return;
 184
 185         remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 186 }
 187
 188 int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
 189 {
 190         if (!remap_ops || !remap_ops->msi_alloc_irq)
 191                 return -ENODEV;
 192
 193         return remap_ops->msi_alloc_irq(pdev, irq, nvec);
 194 }
 195
 196 int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
 197                            int index, int sub_handle)
 198 {
 199         if (!remap_ops || !remap_ops->msi_setup_irq)
 200                 return -ENODEV;
 201
 202         return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
 203 }
 204
 205 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 206 {
 207         if (!remap_ops || !remap_ops->setup_hpet_msi)
 208                 return -ENODEV;
 209
 210         return remap_ops->setup_hpet_msi(irq, id);
 211 }