[PATCH 4/9] drm/i915/dmabuf: add paranoid flush-on-acquire

[Thomas Hellström]

On Mon, 2021-10-18 at 18:45 +0100, Matthew Auld wrote:
> As pointed out by Thomas, we likely need to flush the pages here if
> the
> GPU can read the page contents directly from main memory. Underneath
> we
> don't know what the sg_table is pointing to, so just add a
> wbinvd_on_all_cpus() here, for now.
> 
> Reported-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>

Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>