linux-kernel - [Patch v2 14/23] ACPI: Translate resource into master side address for bridge window resources

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Date:	Mon,  2 Feb 2015 10:42:59 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Lv Zheng <lv.zheng@...el.com>,
	Len Brown <lenb@...nel.org>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: [Patch v2 14/23] 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@...ux.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

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