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Date: Mon, 24 Aug 2026 19:02:58 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Jia Yao <jia.yao@intel.com>
Cc: stable@vger.kernel.org, Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>,
	Matthew Auld <matthew.auld@intel.com>,
	Thomas =?iso-8859-1?Q?Hellstr=F6m?= <thomas.hellstrom@linux.intel.com>
Subject: Re: [PATCH 1/3] drm/xe/guc_ads: allocate UM queues in a separate BO
Message-ID: <2026082417-detonate-glacial-6417@gregkh>
References: <2026082036-afterglow-tapered-84a0@gregkh>
 <20260824165208.498797-1-jia.yao@intel.com>
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In-Reply-To: <20260824165208.498797-1-jia.yao@intel.com>

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 <gwan-gyeong.mun@intel.com>
> Cc: Matthew Auld <matthew.auld@intel.com>
> Cc: <stable@vger.kernel.org> # v6.12+
> Signed-off-by: Jia Yao <jia.yao@intel.com>
> Reviewed-by: Matthew Auld <matthew.auld@intel.com>
> Signed-off-by: Matthew Auld <matthew.auld@intel.com>
> Link: https://patch.msgid.link/20260804165057.129529-2-jia.yao@intel.com
> (cherry picked from commit 6af05de0dc19bbf3aaeec2020fe48b37c834b811)
> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> (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...