linux-kernel - [RFC Patch 06/19] ACPI: Unify the parsing of address_space and ext_address

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Message-Id: <1420684386-5975-7-git-send-email-jiang.liu@linux.intel.com>
Date:	Thu,  8 Jan 2015 10:32:53 +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>, Len Brown <lenb@...nel.org>
Cc:	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Jiang Liu <jiang.liu@...ux.intel.com>
Subject: [RFC Patch 06/19] ACPI: Unify the parsing of address_space and ext_address_space

From: Thomas Gleixner <tglx@...utronix.de>

With the unions in place which let us identify the substructs we can
use a single parser for address_space and ext_address_space.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/acpi/resource.c |   88 ++++++++++++++++++-----------------------------
 1 file changed, 33 insertions(+), 55 deletions(-)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index deb70a839f80..d1ceba02afde 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -178,6 +178,35 @@ bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
 }
 EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
 
+static bool acpi_decode_space(struct resource *res,
+			      struct acpi_resource_address *base,
+			      struct acpi_resource_address64_common *addr)
+{
+	u8 iodec = addr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16;
+	bool window = base->producer_consumer == ACPI_PRODUCER;
+	bool wp = base->info.mem.write_protect;
+	u64 len = addr->address_length;
+
+	res->start = addr->minimum;
+	res->end = addr->maximum;
+
+	switch(base->resource_type) {
+	case ACPI_MEMORY_RANGE:
+		acpi_dev_memresource_flags(res, len, wp, window);
+		break;
+	case ACPI_IO_RANGE:
+		acpi_dev_ioresource_flags(res, len, iodec, window);
+		break;
+	case ACPI_BUS_NUMBER_RANGE:
+		res->flags = IORESOURCE_BUS;
+		break;
+	default:
+		return false;
+	}
+
+	return !(res->flags & IORESOURCE_DISABLED);
+}
+
 /**
  * acpi_dev_resource_address_space - Extract ACPI address space information.
  * @ares: Input ACPI resource object.
@@ -190,39 +219,12 @@ EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
 bool acpi_dev_resource_address_space(struct acpi_resource *ares,
 				     struct resource *res)
 {
-	acpi_status status;
 	struct acpi_resource_address64 addr;
-	bool window;
-	u8 io_decode;
-
-	status = acpi_resource_to_address64(ares, &addr);
-	if (ACPI_FAILURE(status))
-		return false;
 
-	res->start = addr.minimum;
-	res->end = addr.maximum;
-	window = addr.producer_consumer == ACPI_PRODUCER;
-
-	switch(addr.resource_type) {
-	case ACPI_MEMORY_RANGE:
-		acpi_dev_memresource_flags(res, addr.address_length,
-					   addr.info.mem.write_protect,
-					   window);
-		break;
-	case ACPI_IO_RANGE:
-		io_decode = addr.granularity == 0xfff ?
-				ACPI_DECODE_10 : ACPI_DECODE_16;
-		acpi_dev_ioresource_flags(res, addr.address_length,
-					  io_decode, window);
-		break;
-	case ACPI_BUS_NUMBER_RANGE:
-		res->flags = IORESOURCE_BUS;
-		break;
-	default:
+	if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
 		return false;
-	}
 
-	return !(res->flags & IORESOURCE_DISABLED);
+	return acpi_decode_space(res, &addr.common.base, &addr.common.addr);
 }
 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
 
@@ -239,38 +241,14 @@ bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
 					 struct resource *res)
 {
 	struct acpi_resource_extended_address64 *ext_addr;
-	bool window;
-	u8 io_decode;
 
 	if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
 		return false;
 
 	ext_addr = &ares->data.ext_address64;
 
-	res->start = ext_addr->minimum;
-	res->end = ext_addr->maximum;
-	window = ext_addr->producer_consumer == ACPI_PRODUCER;
-
-	switch(ext_addr->resource_type) {
-	case ACPI_MEMORY_RANGE:
-		acpi_dev_memresource_flags(res, ext_addr->address_length,
-					   ext_addr->info.mem.write_protect,
-					   window);
-		break;
-	case ACPI_IO_RANGE:
-		io_decode = ext_addr->granularity == 0xfff ?
-				ACPI_DECODE_10 : ACPI_DECODE_16;
-		acpi_dev_ioresource_flags(res, ext_addr->address_length,
-					  io_decode, window);
-		break;
-	case ACPI_BUS_NUMBER_RANGE:
-		res->flags = IORESOURCE_BUS;
-		break;
-	default:
-		return false;
-	}
-
-	return !(res->flags & IORESOURCE_DISABLED);
+	return acpi_decode_space(res, &ext_addr->common.base,
+				 &ext_addr->common.addr);
 }
 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
 
-- 
1.7.10.4

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