irq_remapping.c 3.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. #include <linux/cpumask.h>
  3. #include <linux/kernel.h>
  4. #include <linux/string.h>
  5. #include <linux/errno.h>
  6. #include <linux/msi.h>
  7. #include <linux/irq.h>
  8. #include <linux/pci.h>
  9. #include <linux/irqdomain.h>
  10. #include <asm/hw_irq.h>
  11. #include <asm/irq_remapping.h>
  12. #include <asm/processor.h>
  13. #include <asm/x86_init.h>
  14. #include <asm/apic.h>
  15. #include <asm/hpet.h>
  16. #include "irq_remapping.h"
  17. int irq_remapping_enabled;
  18. int irq_remap_broken;
  19. int disable_sourceid_checking;
  20. int no_x2apic_optout;
  21. int disable_irq_post = 0;
  22. static int disable_irq_remap;
  23. static struct irq_remap_ops *remap_ops;
  24. static void irq_remapping_restore_boot_irq_mode(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 (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config())
  34. disconnect_bsp_APIC(0);
  35. }
  36. static void __init irq_remapping_modify_x86_ops(void)
  37. {
  38. x86_apic_ops.restore = irq_remapping_restore_boot_irq_mode;
  39. }
  40. static __init int setup_nointremap(char *str)
  41. {
  42. disable_irq_remap = 1;
  43. return 0;
  44. }
  45. early_param("nointremap", setup_nointremap);
  46. static __init int setup_irqremap(char *str)
  47. {
  48. if (!str)
  49. return -EINVAL;
  50. while (*str) {
  51. if (!strncmp(str, "on", 2)) {
  52. disable_irq_remap = 0;
  53. disable_irq_post = 0;
  54. } else if (!strncmp(str, "off", 3)) {
  55. disable_irq_remap = 1;
  56. disable_irq_post = 1;
  57. } else if (!strncmp(str, "nosid", 5))
  58. disable_sourceid_checking = 1;
  59. else if (!strncmp(str, "no_x2apic_optout", 16))
  60. no_x2apic_optout = 1;
  61. else if (!strncmp(str, "nopost", 6))
  62. disable_irq_post = 1;
  63. str += strcspn(str, ",");
  64. while (*str == ',')
  65. str++;
  66. }
  67. return 0;
  68. }
  69. early_param("intremap", setup_irqremap);
  70. void set_irq_remapping_broken(void)
  71. {
  72. irq_remap_broken = 1;
  73. }
  74. bool irq_remapping_cap(enum irq_remap_cap cap)
  75. {
  76. if (!remap_ops || disable_irq_post)
  77. return false;
  78. return (remap_ops->capability & (1 << cap));
  79. }
  80. EXPORT_SYMBOL_GPL(irq_remapping_cap);
  81. int __init irq_remapping_prepare(void)
  82. {
  83. if (disable_irq_remap)
  84. return -ENOSYS;
  85. if (intel_irq_remap_ops.prepare() == 0)
  86. remap_ops = &intel_irq_remap_ops;
  87. else if (IS_ENABLED(CONFIG_AMD_IOMMU) &&
  88. amd_iommu_irq_ops.prepare() == 0)
  89. remap_ops = &amd_iommu_irq_ops;
  90. else if (IS_ENABLED(CONFIG_HYPERV_IOMMU) &&
  91. hyperv_irq_remap_ops.prepare() == 0)
  92. remap_ops = &hyperv_irq_remap_ops;
  93. else
  94. return -ENOSYS;
  95. return 0;
  96. }
  97. int __init irq_remapping_enable(void)
  98. {
  99. int ret;
  100. if (!remap_ops->enable)
  101. return -ENODEV;
  102. ret = remap_ops->enable();
  103. if (irq_remapping_enabled)
  104. irq_remapping_modify_x86_ops();
  105. return ret;
  106. }
  107. void irq_remapping_disable(void)
  108. {
  109. if (irq_remapping_enabled && remap_ops->disable)
  110. remap_ops->disable();
  111. }
  112. int irq_remapping_reenable(int mode)
  113. {
  114. if (irq_remapping_enabled && remap_ops->reenable)
  115. return remap_ops->reenable(mode);
  116. return 0;
  117. }
  118. int __init irq_remap_enable_fault_handling(void)
  119. {
  120. if (!irq_remapping_enabled)
  121. return 0;
  122. if (!remap_ops->enable_faulting)
  123. return -ENODEV;
  124. return remap_ops->enable_faulting();
  125. }
  126. void panic_if_irq_remap(const char *msg)
  127. {
  128. if (irq_remapping_enabled)
  129. panic(msg);
  130. }
  131. /**
  132. * irq_remapping_get_irq_domain - Get the irqdomain serving the request @info
  133. * @info: interrupt allocation information, used to identify the IOMMU device
  134. *
  135. * Returns pointer to IRQ domain, or NULL on failure.
  136. */
  137. struct irq_domain *irq_remapping_get_irq_domain(struct irq_alloc_info *info)
  138. {
  139. if (!remap_ops || !remap_ops->get_irq_domain)
  140. return NULL;
  141. return remap_ops->get_irq_domain(info);
  142. }