tree ce6d362db2350799672bcb167c46d0105d7bade9
parent fe696ccb277d332dc4e625b5b20b988b04d16c04
author Thierry Reding <treding@nvidia.com> 1648117825 +0100
committer Thierry Reding <treding@nvidia.com> 1649250756 +0200

gpu: host1x: Do not use mapping cache for job submissions

Buffer mappings used in job submissions are usually small and not
rapidly reused as opposed to framebuffers (which are usually large and
rapidly reused, for example when page-flipping between double-buffered
framebuffers). Avoid going through the mapping cache for these buffers
since the cache would also lead to leaks if nobody is ever releasing
the cache's last reference. For DRM/KMS these last references are
dropped when the framebuffers are removed and therefore no longer
needed.

While at it, also add a note about the need to explicitly remove the
final reference to the mapping in the cache.

Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>