ACPI: Altix: ACPI _PRT support

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@sgi.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 73ef4a8..ef2fe47 100644 (file)
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -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);
 

diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
index 99d7f27..cb96b4e 100644 (file)
--- a/arch/ia64/sn/kernel/io_acpi_init.c
+++ b/arch/ia64/sn/kernel/io_acpi_init.c
@@ -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)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 279c4ba..766332e 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -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;

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 2b0c955..91f1f23 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -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
 };