[PATCH v3] drm/v3d: clean caches at the end of render jobs on request from user space

[Eric Anholt]

Iago Toral Quiroga <itoral at igalia.com> writes:

> Extends the user space ioctl for CL submissions so it can include a request
> to flush the cache once the CL execution has completed. Fixes memory
> write violation messages reported by the kernel in workloads involving
> shader memory writes (SSBOs, shader images, scratch, etc) which sometimes
> also lead to GPU resets during Piglit and CTS workloads.
>
> v2: if v3d_job_init() fails we need to kfree() the job instead of
>     v3d_job_put() it (Eric Anholt).
>
> v3 (Eric Anholt):
>   - Drop _FLAG suffix from the new flag name.
>   - Add a new param so userspace can tell whether cache flushing is
>     implemented in the kernel.

Appled to drm-misc-next.  Thanks!
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