RE: [PATCH 1/3] drm/xe/guc_ads: allocate UM queues in a separate BO

This fix is intended for all stable trees containing commit
9c57bc08652a ("drm/xe/lnl: Drop force_probe requirement").

Regarding the duplicate cherry-pick annotations, 99b01815957b
was itself cherry-picked from 6af05de0dc19 and the extra
annotation was carried over inadvertently. One of the
cherry-picked lines can be dropped.

> -----Original Message-----
> From: Greg KH <[email protected]>
> Sent: Monday, August 24, 2026 10:03 AM
> To: Yao, Jia <[email protected]>
> Cc: [email protected]; Mun, Gwan-gyeong <gwan-
> [email protected]>; Auld, Matthew <[email protected]>;
> Thomas Hellström <[email protected]>
> Subject: Re: [PATCH 1/3] drm/xe/guc_ads: allocate UM queues in a separate
> BO
> 
> On Mon, Aug 24, 2026 at 04:52:06PM +0000, Jia Yao wrote:
> > Move the UM queues into a dedicated BO (ads->um_queue_bo) and avoid
> > CPU memset operations on it, which eliminates the CPU as a potential
> > cacheline-polluting agent and helps maintain consistency between GAM
> > writes and GuC reads.
> >
> > We also need to ensure the base_dpa for the queue is contiguous on hw
> > where this is used instead of a GGTT address. Another good reason to
> > split this out to a separate BO.
> >
> > Fixes: 9c57bc08652a ("drm/xe/lnl: Drop force_probe requirement")
> > Cc: Gwan-gyeong Mun <[email protected]>
> > Cc: Matthew Auld <[email protected]>
> > Cc: <[email protected]> # v6.12+
> > Signed-off-by: Jia Yao <[email protected]>
> > Reviewed-by: Matthew Auld <[email protected]>
> > Signed-off-by: Matthew Auld <[email protected]>
> > Link:
> > https://patch.msgid.link/[email protected]
> > (cherry picked from commit
> 6af05de0dc19bbf3aaeec2020fe48b37c834b811)
> > Signed-off-by: Thomas Hellström <[email protected]>
> > (cherry picked from commit
> 99b01815957bd7d848420cb697f79ed11f7f215c)
> > ---
> >  drivers/gpu/drm/xe/xe_bo.h            | 14 +++++
> >  drivers/gpu/drm/xe/xe_guc.c           |  6 ++
> >  drivers/gpu/drm/xe/xe_guc_ads.c       | 90 +++++++++++++++++----------
> >  drivers/gpu/drm/xe/xe_guc_ads_types.h |  5 ++
> >  4 files changed, 83 insertions(+), 32 deletions(-)
> 
> What stable tree(s) are these patches for?
> 
> And what's with the crazy 2 cherry picked lines?  You all know better than to
> attempt to mess this up even more...