[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 (file)
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -191,6 +191,29 @@ add_io_space (struct acpi_resource_address64 *addr)
        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 @@ count_window (struct acpi_resource *resource, void *data)
        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 @@ static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
        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;