drm/nouveau: implement explicitly coherent BOs

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Allow nouveau_bo_new() to recognize the TTM_PL_FLAG_UNCACHED flag, which
means that we want the allocated BO to be perfectly coherent between the
CPU and GPU. This is useful on non-coherent architectures for which we
do not want to manually sync some rarely-accessed buffers: typically,
fences and pushbuffers.

A TTM BO allocated with the TTM_PL_FLAG_UNCACHED on a non-coherent
architecture will be populated using the DMA API, and accesses to it
performed using the coherent mapping performed by dma_alloc_coherent().

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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Alexandre Courbot 2014-10-27 18:49:17 +09:00 • committed by Ben Skeggs

parent c5d7ddf70a

commit c3a0c771e5

2 changed files with 73 additions and 8 deletions

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80

drivers/gpu/drm/nouveau/nouveau_bo.c

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1

drivers/gpu/drm/nouveau/nouveau_bo.h

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