diff options
Diffstat (limited to 'arch/x86/kernel/apic/apic.c')
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 54f04355aaa2..4c15bf29ea2c 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -50,6 +50,7 @@ #include <asm/io_apic.h> #include <asm/desc.h> #include <asm/hpet.h> +#include <asm/msidef.h> #include <asm/mtrr.h> #include <asm/time.h> #include <asm/smp.h> @@ -2480,6 +2481,37 @@ int hard_smp_processor_id(void) return read_apic_id(); } +void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg, + bool dmar) +{ + msg->address_hi = MSI_ADDR_BASE_HI; + + msg->address_lo = + MSI_ADDR_BASE_LO | + (apic->dest_mode_logical ? + MSI_ADDR_DEST_MODE_LOGICAL : + MSI_ADDR_DEST_MODE_PHYSICAL) | + MSI_ADDR_REDIRECTION_CPU | + MSI_ADDR_DEST_ID(cfg->dest_apicid); + + msg->data = + MSI_DATA_TRIGGER_EDGE | + MSI_DATA_LEVEL_ASSERT | + MSI_DATA_DELIVERY_FIXED | + MSI_DATA_VECTOR(cfg->vector); + + /* + * Only the IOMMU itself can use the trick of putting destination + * APIC ID into the high bits of the address. Anything else would + * just be writing to memory if it tried that, and needs IR to + * address higher APIC IDs. + */ + if (dmar) + msg->address_hi |= MSI_ADDR_EXT_DEST_ID(cfg->dest_apicid); + else + WARN_ON_ONCE(MSI_ADDR_EXT_DEST_ID(cfg->dest_apicid)); +} + /* * Override the generic EOI implementation with an optimized version. * Only called during early boot when only one CPU is active and with |