drivers/iommu/intr_remapping.c

   1 #include <linux/kernel.h>
   2 #include <linux/string.h>
   3 #include <linux/errno.h>
   4
   5 #include "intr_remapping.h"
   6
   7 int intr_remapping_enabled;
   8
   9 int disable_intremap;
  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_intremap = 1;
  18         return 0;
  19 }
  20 early_param("nointremap", setup_nointremap);
  21
  22 static __init int setup_intremap(char *str)
  23 {
  24         if (!str)
  25                 return -EINVAL;
  26
  27         while (*str) {
  28                 if (!strncmp(str, "on", 2))
  29                         disable_intremap = 0;
  30                 else if (!strncmp(str, "off", 3))
  31                         disable_intremap = 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_intremap);
  45
  46 void __init setup_intr_remapping(void)
  47 {
  48         remap_ops = &intel_irq_remap_ops;
  49 }
  50
  51 int intr_remapping_supported(void)
  52 {
  53         if (disable_intremap)
  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 intr_hardware_init(void)
  63 {
  64         if (!remap_ops || !remap_ops->hardware_init)
  65                 return -ENODEV;
  66
  67         return remap_ops->hardware_init();
  68 }
  69
  70 int __init intr_hardware_enable(void)
  71 {
  72         if (!remap_ops || !remap_ops->hardware_enable)
  73                 return -ENODEV;
  74
  75         return remap_ops->hardware_enable();
  76 }
  77
  78 void intr_hardware_disable(void)
  79 {
  80         if (!remap_ops || !remap_ops->hardware_disable)
  81                 return;
  82
  83         remap_ops->hardware_disable();
  84 }
  85
  86 int intr_hardware_reenable(int mode)
  87 {
  88         if (!remap_ops || !remap_ops->hardware_reenable)
  89                 return 0;
  90
  91         return remap_ops->hardware_reenable(mode);
  92 }
  93
  94 int __init intr_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 intr_setup_ioapic_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 }