[IA64] respect ACPI producer/consumer flag for PCI root bridges
Address space resources for ACPI devices have a producer/consumer
flag. All devices "consume" the indicated address space. If the
resource is marked as a "producer", the range is also passed on
to child devices.
We currently ignore this flag when setting up MMIO and I/O port
windows for PCI root bridges, so we could mistakenly interpret
a "consumed-only" range, like CSR space for the device itself,
as a window that is routed to children.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 9b5de58..564319e 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -191,6 +191,29 @@
return IO_SPACE_BASE(i);
}
+static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
+ struct acpi_resource_address64 *addr)
+{
+ acpi_status status;
+
+ /*
+ * We're only interested in _CRS descriptors that are
+ * - address space descriptors for memory or I/O space
+ * - non-zero size
+ * - producers, i.e., the address space is routed downstream,
+ * not consumed by the bridge itself
+ */
+ status = acpi_resource_to_address64(resource, addr);
+ if (ACPI_SUCCESS(status) &&
+ (addr->resource_type == ACPI_MEMORY_RANGE ||
+ addr->resource_type == ACPI_IO_RANGE) &&
+ addr->address_length &&
+ addr->producer_consumer == ACPI_PRODUCER)
+ return AE_OK;
+
+ return AE_ERROR;
+}
+
static acpi_status __devinit
count_window (struct acpi_resource *resource, void *data)
{
@@ -198,11 +221,9 @@
struct acpi_resource_address64 addr;
acpi_status status;
- status = acpi_resource_to_address64(resource, &addr);
+ status = resource_to_window(resource, &addr);
if (ACPI_SUCCESS(status))
- if (addr.resource_type == ACPI_MEMORY_RANGE ||
- addr.resource_type == ACPI_IO_RANGE)
- (*windows)++;
+ (*windows)++;
return AE_OK;
}
@@ -221,13 +242,11 @@
unsigned long flags, offset = 0;
struct resource *root;
- status = acpi_resource_to_address64(res, &addr);
+ /* Return AE_OK for non-window resources to keep scanning for more */
+ status = resource_to_window(res, &addr);
if (!ACPI_SUCCESS(status))
return AE_OK;
- if (!addr.address_length)
- return AE_OK;
-
if (addr.resource_type == ACPI_MEMORY_RANGE) {
flags = IORESOURCE_MEM;
root = &iomem_resource;