On 30 July 2018 at 08:53, Chris Wilson <[email protected]> wrote:
> We occasionally see that the clflush prior to a read of GPU data is
> returning stale data, reminiscent of much earlier bugs fixed by adding a
> second clflush for serialisation. As drm_clflush_virt_range() already
> supplies the workaround, use it rather than open code the clflush
> instruction.
>
> References: 396f5d62d1a5 ("drm: Restore double clflush on the last partial
> cacheline")
> Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
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