diff options
Diffstat (limited to 'drivers/iommu/irq_remapping.c')
| -rw-r--r-- | drivers/iommu/irq_remapping.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c new file mode 100644 index 000000000..7d0f3074d --- /dev/null +++ b/drivers/iommu/irq_remapping.c @@ -0,0 +1,192 @@ +#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); +} |