[RFC 1/7] ACPI/PCI: Enhance ACPI core to support sparse IO space

Jiang Liu
2015-04-07T04:29:05Z

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

Tested-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.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 0187e0e11bb8..5727c3bf98c9 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 2c5250222278..b9762760ca49 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