[PATCH 3/7] drm/radeon: implement unpin function

[Daniel Vetter]

On Tue, Apr 9, 2013 at 4:26 PM, Maarten Lankhorst
<maarten.lankhorst at canonical.com> wrote:
> Op 09-04-13 16:16, Jerome Glisse schreef:
>> On Tue, Apr 9, 2013 at 7:37 AM, Maarten Lankhorst
>> <m.b.lankhorst at gmail.com>wrote:
>>
>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
>>>
>> Can userspace pin directly ? If so then that sounds as a bad idea.
>>
>> Reviewed-by: Jerome Glisse <jglisse at redhat.com>
>>
> It's slightly better than before, it used to pin as soon as you export a buffer for as long as the buffer exists, with the series the pinning will only happen when importing to another device, until the device releases their reference.

To make fully dynamic pinning work (and especially reclaiming) we
first need dma_buf fences, the new ww_mutexes and all that stuff since
otherwise you can trivially deadlock in buffer reservations. But I
think with Maarten's stuff we have a plan to get there, and this is
just the first tiny step of a long journey.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch