On 2015/1/21 22:47, Rafael J. Wysocki wrote:
> On Wednesday, January 21, 2015 01:37:40 PM Jiang Liu wrote:
>> On 2015/1/21 8:53, Rafael J. Wysocki wrote:
>>> On Thursday, January 08, 2015 10:33:02 AM Jiang Liu wrote:
>>>> Add field offset to struct resource_list_entry to host address space
>>>> translation offset so it could be used to represent bridge resources.
>>>>
>>>> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
>>>> ---
>>>> drivers/acpi/resource.c | 13 ++++++++-----
>>>> include/linux/acpi.h | 1 +
>>>> 2 files changed, 9 insertions(+), 5 deletions(-)
>>>>
>>>> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
>>>> index 16d334a1ee25..54204ac94f8e 100644
>>>> --- a/drivers/acpi/resource.c
>>>> +++ b/drivers/acpi/resource.c
>>>> @@ -462,7 +462,8 @@ struct res_proc_context {
>>>> };
>>>>
>>>> static acpi_status acpi_dev_new_resource_entry(struct resource *r,
>>>> - struct res_proc_context *c)
>>>> + struct res_proc_context *c,
>>>> + resource_size_t offset)
>>>> {
>>>> struct resource_list_entry *rentry;
>>>>
>>>> @@ -472,6 +473,7 @@ static acpi_status acpi_dev_new_resource_entry(struct resource *r,
>>>> return AE_NO_MEMORY;
>>>> }
>>>> rentry->res = *r;
>>>> + rentry->offset = offset;
>>>> list_add_tail(&rentry->node, c->list);
>>>> c->count++;
>>>> return AE_OK;
>>>> @@ -480,6 +482,7 @@ static acpi_status acpi_dev_new_resource_entry(struct resource *r,
>>>> static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
>>>> void *context)
>>>> {
>>>> + resource_size_t offset = 0;
>>>> struct res_proc_context *c = context;
>>>> struct resource r;
>>>> int i;
>>>> @@ -500,14 +503,14 @@ static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
>>>>
>>>> if (acpi_dev_resource_memory(ares, &r)
>>>> || acpi_dev_resource_io(ares, &r)
>>>> - || acpi_dev_resource_address_space(ares, &r, NULL)
>>>> - || acpi_dev_resource_ext_address_space(ares, &r, NULL))
>>>> - return acpi_dev_new_resource_entry(&r, c);
>>>> + || acpi_dev_resource_address_space(ares, &r, &offset)
>>>> + || acpi_dev_resource_ext_address_space(ares, &r, &offset))
>>>> + return acpi_dev_new_resource_entry(&r, c, offset);
>>>>
>>>> for (i = 0; acpi_dev_resource_interrupt(ares, i, &r); i++) {
>>>> acpi_status status;
>>>>
>>>> - status = acpi_dev_new_resource_entry(&r, c);
>>>> + status = acpi_dev_new_resource_entry(&r, c, 0);
>>>> if (ACPI_FAILURE(status))
>>>> return status;
>>>> }
>>>> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>>>> index bde8119f5897..fea78e772450 100644
>>>> --- a/include/linux/acpi.h
>>>> +++ b/include/linux/acpi.h
>>>> @@ -300,6 +300,7 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
>>>> struct resource_list_entry {
>>>> struct list_head node;
>>>> struct resource res;
>>>> + resource_size_t offset;
>>>
>>> Well, so instead of adding the offset thing here and there, wouldn't it be
>>> cleaner to introduce something like
>>>
>>> struct ext_resource {
>>> sturct resource res;
>>> resource_size_t offset;
>>> };
>>>
>>> and use struct ext_resource instead of struct resource where an offset is needed?
>>>
>>> Just a thought ...
>> Hi Rafael,
>> Following patches will achieve this by sharing struct resource_list_entry.
>
> Well, yes, they will partially, but that still won't avoid the need to pass
> offset (or pointers to that) to several functions separately if I'm not
> mistaken. Which is kind of ugly.
Hi Rafael,
Sorry, I missed your point with last reply. I have the basic
idea about how to follow your suggestion now, will do it in next
version.
Regards,
Gerry
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