[Mesa-dev] [PATCH 1/2] gallium: Add PIPE_CAP_USER_MEMORY_PAGE_SIZE for page size of user pointers

[Michel Dänzer]

On 17/08/17 12:33 PM, Aaron Watry wrote:
> On Wed, Aug 16, 2017 at 9:48 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
>> On Wed, Aug 16, 2017 at 10:39 PM, Michel Dänzer <michel at daenzer.net> wrote:
>>> On 17/08/17 10:52 AM, Aaron Watry wrote:
>>>> PIPE_CAP_RESOURCE_FROM_USER_MEMORY says that size must be page aligned,
>>>> but doesn't necessarily say anything about the size of those pages.
>>>
>>> Is there any case known so far where it's not the CPU page size?
>>
>> It's always the CPU page size.  The limitation is not a hw limitation,
>> it's a sw limitation with the way the kernel handles creating BOs from
>> user memory.
> 
> So this won't change with the 2MB pages that are coming up for Vega?

I don't think it will, that's only about VRAM.


> If so, I guess I can just use getpagesize() in patch 2 for now and skip the CAP.

Right.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer