linux-kernel - [Patch v3 1/7] ACPI/PCI: Enhance ACPI core to support sparse IO space

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Date:	Thu, 14 May 2015 16:56:37 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Len Brown <lenb@...nel.org>, Vivek Goyal <vgoyal@...hat.com>,
	Thierry Reding <treding@...dia.com>,
	Jakub Sitnicki <jsitnicki@...il.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Lv Zheng <lv.zheng@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, "x86 @ kernel . org" <x86@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [Patch v3 1/7] ACPI/PCI: Enhance ACPI core to support sparse IO space

Enhance ACPI resource parsing interfaces to support sparse IO space,
which will be used to share common code between x86 and IA64 later.

Tested-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/acpi/resource.c |    9 ++++++---
 include/linux/ioport.h  |    1 +
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 8244f013f210..fdcc73dad2c1 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -123,7 +123,7 @@ bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
 EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
 
 static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
-				      u8 io_decode)
+				      u8 io_decode, u8 translation_type)
 {
 	res->flags = IORESOURCE_IO;
 
@@ -135,6 +135,8 @@ static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
 
 	if (io_decode == ACPI_DECODE_16)
 		res->flags |= IORESOURCE_IO_16BIT_ADDR;
+	if (translation_type == ACPI_SPARSE_TRANSLATION)
+		res->flags |= IORESOURCE_IO_SPARSE;
 }
 
 static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
@@ -142,7 +144,7 @@ static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
 {
 	res->start = start;
 	res->end = start + len - 1;
-	acpi_dev_ioresource_flags(res, len, io_decode);
+	acpi_dev_ioresource_flags(res, len, io_decode, 0);
 }
 
 /**
@@ -227,7 +229,8 @@ static bool acpi_decode_space(struct resource_win *win,
 		acpi_dev_memresource_flags(res, len, wp);
 		break;
 	case ACPI_IO_RANGE:
-		acpi_dev_ioresource_flags(res, len, iodec);
+		acpi_dev_ioresource_flags(res, len, iodec,
+					  addr->info.io.translation_type);
 		break;
 	case ACPI_BUS_NUMBER_RANGE:
 		res->flags = IORESOURCE_BUS;
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 388e3ae94f7a..24bea087e7af 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -94,6 +94,7 @@ struct resource {
 /* PnP I/O specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_IO_16BIT_ADDR	(1<<0)
 #define IORESOURCE_IO_FIXED		(1<<1)
+#define IORESOURCE_IO_SPARSE		(1<<2)
 
 /* PCI ROM control bits (IORESOURCE_BITS) */
 #define IORESOURCE_ROM_ENABLE		(1<<0)	/* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
-- 
1.7.10.4

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