[Patch v4 14/23] ACPI: Translate resource into master side address for bridge window resources

Jiang Liu
2015-02-05T05:45:58Z

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>
---
drivers/acpi/resource.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

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);
--
1.7.10.4