Provide ACPI _PRT support for SN Altix systems. The SN Altix platform does not conform to the IOSAPIC IRQ routing model, so a new acpi_irq_model (ACPI_IRQ_MODEL_PLATFORM) has been defined. The SN platform specific code sets acpi_irq_model to this new value, and keys off of it in acpi_register_gsi() to avoid the iosapic code path. Signed-off-by: John Keller <jpk@xxxxxxx> --- To avoid future regression/backward compatibilty issues when _PRT support is added to our PROM, we'd like to see this pushed into 2.6.20, if at all possible. arch/ia64/kernel/acpi.c | 3 +++ arch/ia64/sn/kernel/io_acpi_init.c | 3 +++ drivers/acpi/bus.c | 3 +++ include/linux/acpi.h | 1 + 4 files changed, 10 insertions(+) Index: linux/arch/ia64/kernel/acpi.c =================================================================== --- linux.orig/arch/ia64/kernel/acpi.c 2006-10-24 02:38:54.000000000 -0500 +++ linux/arch/ia64/kernel/acpi.c 2006-12-22 10:54:36.930343639 -0600 @@ -590,6 +590,9 @@ void __init acpi_numa_arch_fixup(void) */ int acpi_register_gsi(u32 gsi, int triggering, int polarity) { + if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) + return gsi; + if (has_8259 && gsi < 16) return isa_irq_to_vector(gsi); Index: linux/arch/ia64/sn/kernel/io_acpi_init.c =================================================================== --- linux.orig/arch/ia64/sn/kernel/io_acpi_init.c 2006-12-21 00:51:59.000000000 -0600 +++ linux/arch/ia64/sn/kernel/io_acpi_init.c 2006-12-22 10:53:45.504213484 -0600 @@ -223,6 +223,9 @@ sn_io_acpi_init(void) u64 result; s64 status; + /* SN Altix does not follow the IOSAPIC IRQ routing model */ + acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM; + acpi_bus_register_driver(&acpi_sn_hubdev_driver); status = sal_ioif_init(&result); if (status || result) Index: linux/drivers/acpi/bus.c =================================================================== --- linux.orig/drivers/acpi/bus.c 2006-08-28 20:40:10.000000000 -0500 +++ linux/drivers/acpi/bus.c 2006-12-22 10:52:32.155474439 -0600 @@ -561,6 +561,9 @@ static int __init acpi_bus_init_irq(void case ACPI_IRQ_MODEL_IOSAPIC: message = "IOSAPIC"; break; + case ACPI_IRQ_MODEL_PLATFORM: + message = "platform specific model"; + break; default: printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); return -ENODEV; Index: linux/include/linux/acpi.h =================================================================== --- linux.orig/include/linux/acpi.h 2006-10-24 02:38:54.000000000 -0500 +++ linux/include/linux/acpi.h 2006-12-22 10:52:53.337997675 -0600 @@ -47,6 +47,7 @@ enum acpi_irq_model_id { ACPI_IRQ_MODEL_PIC = 0, ACPI_IRQ_MODEL_IOAPIC, ACPI_IRQ_MODEL_IOSAPIC, + ACPI_IRQ_MODEL_PLATFORM, ACPI_IRQ_MODEL_COUNT }; - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
![]() |