| #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); |
| } |