* PGP Signed by an unknown key
On 11/11/2015 06:07 PM, Alexandre Courbot wrote:
Commit 69c4938249fb ("drm/nouveau/instmem/gk20a: use direct CPU access")I just spoke to Dave, and I'll take this in my tree for 4.5 if
tried to be smart while using the DMA-API by managing the CPU mappings of
buffers allocated with the DMA-API by itself. In doing so, it relied
on dma_to_phys() which is an architecture-private function not
available everywhere. This broke the build on several architectures.
Since there is no reliable and portable way to obtain the physical
address of a DMA-API buffer, stop trying to be smart and just use the
CPU mapping that the DMA-API can provide. This means that buffers will
be CPU-mapped for all their life as opposed to when we need them, but
anyway using the DMA-API here is a fallback for when no IOMMU is
available so we should not expect optimal behavior.
This makes the IOMMU and DMA-API implementations of instmem diverge
enough that we should maybe put them into separate files...
Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
Ben/Dave, since Dave's fix has reached mainline and builds are not
broken anymore, we can proceed one of two ways:
1) Ben merges this for 4.4 and let it flow for -rc2
2) I send another fix against the kernel tree
everything works fine with the temporary hack fix. Does that sound OK