[Intel-gfx] Stable Patch Don't use BAR mappings for ring buffers with LLC might create some issues with 5.15

Sun Mar 12 11:13:03 UTC 2023

On Sun, Mar 12, 2023 at 04:41:32PM +0700, Philip Müller wrote:
> ||||||||||||||||||||
> 
> ||
> 
> Hi all,
> 
> seems there is a report open on the "drm/i915: Don't use BAR mappings for ring buffers with LLC" patch, which was included into 5.15.99 lately.
> 
> I saw this patch also on 6.1 and 6.2. Older LTS kernels I didn't found them yet, even it is tagged to be included from v4.9+ on. However I saw also the patch "drm/i915: Don't use stolen memory for ring buffers with LLC" applied when applied to other kernel series.
> 
> Reverting the patch according to this fixes it:https://gitlab.freedesktop.org/drm/intel/-/issues/8284
> 
> Maybe double-check what is actually needed if this creates issues on some Intel i915 hardware. Thx.

Also another report of this here:
	https://lore.kernel.org/r/NQJqG8n--3-9@tuta.io

I'll go revert this for now and do a new release.

thanks,

greg k-h