linux/drivers/iommu/irq_remapping.c
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   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
  12int irq_remapping_enabled;
  13
  14int disable_irq_remap;
  15int disable_sourceid_checking;
  16int no_x2apic_optout;
  17
  18static struct irq_remap_ops *remap_ops;
  19
  20static __init int setup_nointremap(char *str)
  21{
  22        disable_irq_remap = 1;
  23        return 0;
  24}
  25early_param("nointremap", setup_nointremap);
  26
  27static __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}
  49early_param("intremap", setup_irqremap);
  50
  51void __init setup_irq_remapping_ops(void)
  52{
  53        remap_ops = &intel_irq_remap_ops;
  54}
  55
  56int 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
  67int __init irq_remapping_prepare(void)
  68{
  69        if (!remap_ops || !remap_ops->prepare)
  70                return -ENODEV;
  71
  72        return remap_ops->prepare();
  73}
  74
  75int __init irq_remapping_enable(void)
  76{
  77        if (!remap_ops || !remap_ops->enable)
  78                return -ENODEV;
  79
  80        return remap_ops->enable();
  81}
  82
  83void irq_remapping_disable(void)
  84{
  85        if (!remap_ops || !remap_ops->disable)
  86                return;
  87
  88        remap_ops->disable();
  89}
  90
  91int 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
  99int __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
 107int 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
 119int 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
 129void 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
 137void 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
 147int 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
 155int 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
 164int 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}
 171
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