diff options
Diffstat (limited to 'arch/i386/kernel')
| -rw-r--r-- | arch/i386/kernel/io_apic.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c index fca689cfb0c9..85e7d5d465a2 100644 --- a/arch/i386/kernel/io_apic.c +++ b/arch/i386/kernel/io_apic.c @@ -31,6 +31,7 @@ #include <linux/acpi.h> #include <linux/module.h> #include <linux/sysdev.h> +#include <linux/pci.h> #include <asm/io.h> #include <asm/smp.h> @@ -38,6 +39,7 @@ #include <asm/timer.h> #include <asm/i8259.h> #include <asm/nmi.h> +#include <asm/msidef.h> #include <mach_apic.h> #include <mach_apicdef.h> @@ -2531,6 +2533,74 @@ void destroy_irq(unsigned int irq) } #endif /* CONFIG_PCI_MSI */ +/* + * MSI mesage composition + */ +#ifdef CONFIG_PCI_MSI +static int msi_msg_setup(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg) +{ + /* For now always this code always uses physical delivery + * mode. + */ + int vector; + unsigned dest; + + vector = assign_irq_vector(irq); + if (vector >= 0) { + dest = cpu_mask_to_apicid(TARGET_CPUS); + + msg->address_hi = MSI_ADDR_BASE_HI; + msg->address_lo = + MSI_ADDR_BASE_LO | + ((INT_DEST_MODE == 0) ? + MSI_ADDR_DEST_MODE_PHYSICAL: + MSI_ADDR_DEST_MODE_LOGICAL) | + ((INT_DELIVERY_MODE != dest_LowestPrio) ? + MSI_ADDR_REDIRECTION_CPU: + MSI_ADDR_REDIRECTION_LOWPRI) | + MSI_ADDR_DEST_ID(dest); + + msg->data = + MSI_DATA_TRIGGER_EDGE | + MSI_DATA_LEVEL_ASSERT | + ((INT_DELIVERY_MODE != dest_LowestPrio) ? + MSI_DATA_DELIVERY_FIXED: + MSI_DATA_DELIVERY_LOWPRI) | + MSI_DATA_VECTOR(vector); + } + return vector; +} + +static void msi_msg_teardown(unsigned int irq) +{ + return; +} + +static void msi_msg_set_affinity(unsigned int irq, cpumask_t mask, struct msi_msg *msg) +{ + int vector; + unsigned dest; + + vector = assign_irq_vector(irq); + if (vector > 0) { + dest = cpu_mask_to_apicid(mask); + + msg->data &= ~MSI_DATA_VECTOR_MASK; + msg->data |= MSI_DATA_VECTOR(vector); + msg->address_lo &= ~MSI_ADDR_DEST_ID_MASK; + msg->address_lo |= MSI_ADDR_DEST_ID(dest); + } +} + +struct msi_ops arch_msi_ops = { + .needs_64bit_address = 0, + .setup = msi_msg_setup, + .teardown = msi_msg_teardown, + .target = msi_msg_set_affinity, +}; + +#endif /* CONFIG_PCI_MSI */ + /* -------------------------------------------------------------------------- ACPI-based IOAPIC Configuration -------------------------------------------------------------------------- */ |