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
};
-
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