#include <linux/seq_file.h> #include <linux/cpumask.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/msi.h> #include <linux/irq.h> #include <linux/pci.h> #include <linux/irqdomain.h> #include <asm/hw_irq.h> #include <asm/irq_remapping.h> #include <asm/processor.h> #include <asm/x86_init.h> #include <asm/apic.h> #include <asm/hpet.h> #include "irq_remapping.h" int irq_remapping_enabled; int irq_remap_broken; int disable_sourceid_checking; int no_x2apic_optout; int disable_irq_post = 0; static int disable_irq_remap; static struct irq_remap_ops *remap_ops; static void irq_remapping_restore_boot_irq_mode(void) { /* * With interrupt-remapping, for now we will use virtual wire A * mode, as virtual wire B is little complex (need to configure * both IOAPIC RTE as well as interrupt-remapping table entry). * As this gets called during crash dump, keep this simple for * now. */ if (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config()) disconnect_bsp_APIC(0); } static void __init irq_remapping_modify_x86_ops(void) { x86_apic_ops.restore = irq_remapping_restore_boot_irq_mode; } static __init int setup_nointremap(char *str) { disable_irq_remap = 1; return 0; } early_param("nointremap", setup_nointremap); static __init int setup_irqremap(char *str) { if (!str) return -EINVAL; while (*str) { if (!strncmp(str, "on", 2)) { disable_irq_remap = 0; disable_irq_post = 0; } else if (!strncmp(str, "off", 3)) { disable_irq_remap = 1; disable_irq_post = 1; } else if (!strncmp(str, "nosid", 5)) disable_sourceid_checking = 1; else if (!strncmp(str, "no_x2apic_optout", 16)) no_x2apic_optout = 1; else if (!strncmp(str, "nopost", 6)) disable_irq_post = 1; str += strcspn(str, ","); while (*str == ',') str++; } return 0; } early_param("intremap", setup_irqremap); void set_irq_remapping_broken(void) { irq_remap_broken = 1; } bool irq_remapping_cap(enum irq_remap_cap cap) { if (!remap_ops || disable_irq_post) return false; return (remap_ops->capability & (1 << cap)); } EXPORT_SYMBOL_GPL(irq_remapping_cap); int __init irq_remapping_prepare(void) { if (disable_irq_remap) return -ENOSYS; if (intel_irq_remap_ops.prepare() == 0) remap_ops = &intel_irq_remap_ops; else if (IS_ENABLED(CONFIG_AMD_IOMMU) && amd_iommu_irq_ops.prepare() == 0) remap_ops = &amd_iommu_irq_ops; else return -ENOSYS; return 0; } int __init irq_remapping_enable(void) { int ret; if (!remap_ops->enable) return -ENODEV; ret = remap_ops->enable(); if (irq_remapping_enabled) irq_remapping_modify_x86_ops(); return ret; } void irq_remapping_disable(void) { if (irq_remapping_enabled && remap_ops->disable) remap_ops->disable(); } int irq_remapping_reenable(int mode) { if (irq_remapping_enabled && remap_ops->reenable) return remap_ops->reenable(mode); return 0; } int __init irq_remap_enable_fault_handling(void) { if (!irq_remapping_enabled) return 0; if (!remap_ops->enable_faulting) return -ENODEV; return remap_ops->enable_faulting(); } void panic_if_irq_remap(const char *msg) { if (irq_remapping_enabled) panic(msg); } /** * irq_remapping_get_ir_irq_domain - Get the irqdomain associated with the IOMMU * device serving request @info * @info: interrupt allocation information, used to identify the IOMMU device * * It's used to get parent irqdomain for HPET and IOAPIC irqdomains. * Returns pointer to IRQ domain, or NULL on failure. */ struct irq_domain * irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info) { if (!remap_ops || !remap_ops->get_ir_irq_domain) return NULL; return remap_ops->get_ir_irq_domain(info); } /** * irq_remapping_get_irq_domain - Get the irqdomain serving the request @info * @info: interrupt allocation information, used to identify the IOMMU device * * There will be one PCI MSI/MSIX irqdomain associated with each interrupt * remapping device, so this interface is used to retrieve the PCI MSI/MSIX * irqdomain serving request @info. * Returns pointer to IRQ domain, or NULL on failure. */ struct irq_domain * irq_remapping_get_irq_domain(struct irq_alloc_info *info) { if (!remap_ops || !remap_ops->get_irq_domain) return NULL; return remap_ops->get_irq_domain(info); }