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SubjectRe: [Patch v5 1/6] ACPI/PCI: Enhance ACPI core to support sparse IO space
On Wed, Sep 9, 2015 at 1:38 AM, Jiang Liu <jiang.liu@linux.intel.com> wrote:
> On 2015/7/30 4:37, Bjorn Helgaas wrote:
>> On Tue, Jun 09, 2015 at 12:20:43AM +0800, Jiang Liu wrote:
>>> 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@intel.com>
>>> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
>>> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
>>> ---
>>> 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)
>>
>> I don't really like this bit. We adding a new generic IORESOURCE_* bit
>> just for a special case, and it's only used in one place, for one arch,
>> during enumeration.
> Hi Bjorn,
> Instead of defining a formal flag IORESOURCE_IO_SPARSE, we may
> reuse other field in struct resource to pass back the SPARSE flag,
> but that's a little dirty. For example, we may reuse res->name field
> to carry the SPARSE flag for the IA64 special case.
> Is that OK?

No, I think that's even worse. Adding IORESOURCE_IO_SPARSE looks
positively glorious now.

Bjorn


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