Re: [PATCH] gpu: host1x: Do not use mapping cache for job submissions

[Thierry Reding <thierry.reding@gmail.com>]

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On Thu, Mar 24, 2022 at 11:30:25AM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> 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.
> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>  drivers/gpu/host1x/job.c | 4 ++--
>  include/linux/host1x.h   | 5 +++++
>  2 files changed, 7 insertions(+), 2 deletions(-)

Applied.

Thierry

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