ACPI: Translate resource into master side address for bridge window resources

Add translation_offset into the result address for bridge window
resources to form the master side address.

Currently acpi_dev_resource_{ext_}address_space() are only used for
devices instead of bridges, so it won't break current users. Later
it will be used to support PCI host bridge drivers.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index c902c8eece81..4dc8cfb2e94e 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -205,6 +205,21 @@ static bool acpi_decode_space(struct resource_win *win,
         res->start = attr->minimum;
         res->end = attr->maximum;
 
+        /*
+         * For bridges that translate addresses across the bridge,
+         * translation_offset is the offset that must be added to the
+         * address on the secondary side to obtain the address on the
+         * primary side. Non-bridge devices must list 0 for all Address
+         * Translation offset bits.
+         */
+        if (addr->producer_consumer == ACPI_PRODUCER) {
+                res->start += attr->translation_offset;
+                res->end += attr->translation_offset;
+        } else if (attr->translation_offset) {
+                pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n",
+                         attr->translation_offset);
+        }
+
         switch (addr->resource_type) {
         case ACPI_MEMORY_RANGE:
                 acpi_dev_memresource_flags(res, len, wp);