From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B52DC3E2AAF for ; Tue, 25 Aug 2026 08:28:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787646537; cv=none; b=mAv0qHFE8QWYshAWJ+AKWixnW0JZHPB3q/+8ix5fB+AZUPOpm/TmjuZHbaGgRrqctTlEHBJJq9UU/dB/zLi22Mz2n8U28Tj9m1oQpBIPXOqHlty6rVp1i4N+XUyT4Q4yLyuZtq9+lDLkAch8oIwgeP3qMvmmCrtzVJbQ6PIMUuU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787646537; c=relaxed/simple; bh=mGH8Nwx572CTfP/1QDJsW/mggP9iIrflc0CYlU9qs4U=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=q8M8WgOIKFsd6qamwUrBVvqe9NlHkddT892Y2yoq3RlUVB0WWUEpVlL4g83quheAXWF3ISN0gvNWbNyFs9hCdd2/Ts81G2S0EZjnz5t6RX08msNsz6eEolAD0wV+dHjf3oUgMjrglxg50H2eWT04ZUZjjf759KS203gRtcGtCzI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=s2poeroJ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="s2poeroJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3D9101F000E9; Tue, 25 Aug 2026 08:28:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787646536; bh=32GBGUHejytOR67gMA2DxitOVjIpWrKDqlHnnEwE1uM=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=s2poeroJsKI3dZUjtjYkNQkxchKhMfSNOOFmxETina8fmzSZO/mQ4xQRxHkCKelmD rYyRHic6FrUAqI6JobCn576447GxWaoeEqT7QK9b4kko3bFDxQFTNHvx/jJuzA7Lta lpihKKtw7FOymyQDMyEbc5uAoZ1DvCN2fhl4oW3Y= Date: Tue, 25 Aug 2026 10:28:50 +0200 From: Greg KH To: Jia Yao Cc: stable@vger.kernel.org, Gwan-gyeong Mun , Matthew Auld , Thomas =?iso-8859-1?Q?Hellstr=F6m?= Subject: Re: [PATCH 6.18.y 3/3] drm/xe/guc_ads: use uncached mapping for UM queue BO Message-ID: <2026082551-promotion-liberty-83d3@gregkh> References: <2026082036-afterglow-tapered-84a0@gregkh> <20260825034224.642641-1-jia.yao@intel.com> <20260825034224.642641-3-jia.yao@intel.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260825034224.642641-3-jia.yao@intel.com> On Tue, Aug 25, 2026 at 03:42:24AM +0000, Jia Yao wrote: > On Pre-Xe3p platform, the GAM write the UM queue through DPA using UC. > if GuC reads the queue via GGTT (WB), stale data may be observed > when the cacheline has been polluted by another agent. > > To match the GAM's UC writes, configure the GuC mapping as UC as well. > > Fixes: 9c57bc08652a ("drm/xe/lnl: Drop force_probe requirement") > Cc: Gwan-gyeong Mun > Cc: Matthew Auld > Cc: # v6.12+ > Signed-off-by: Jia Yao > Reviewed by: Matthew Auld > Signed-off-by: Matthew Auld > Link: https://patch.msgid.link/20260804165057.129529-4-jia.yao@intel.com > (cherry picked from commit 9daa302a82590eeee7bdc68023ddad302df4b88c) Same here, invalid git commit id. You all really screw yourself with the bizarre "cherry-pick backwards in time" model :( Please reconsider it as it seems to cause nothing but trouble. greg k-h