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

Aaron Watry awatry at gmail.com
Thu Aug 17 03:33:08 UTC 2017

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?

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


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