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([2001:b07:2ec:601d:4b26:1672:75c7:805a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493e10af392sm62069495e9.2.2026.07.07.08.02.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jul 2026 08:02:45 -0700 (PDT) Message-ID: Date: Tue, 7 Jul 2026 17:02:43 +0200 Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 03/13] drm/msm: look for lpac from dts To: Dmitry Baryshkov Cc: Rob Clark , Will Deacon , Robin Murphy , Joerg Roedel , Sean Paul , Konrad Dybcio , Akhil P Oommen , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Marijn Suijten , David Airlie , Simona Vetter , Bjorn Andersson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , iommu@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org References: <20260705-descriptive-name-lpac-upstream-v1-0-01d50c3e0c99@gmail.com> <20260705-descriptive-name-lpac-upstream-v1-3-01d50c3e0c99@gmail.com> Content-Language: en-US From: Anna Maniscalco In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/6/26 5:04 PM, Dmitry Baryshkov wrote: > On Sun, Jul 05, 2026 at 09:13:37PM +0200, Anna Maniscalco wrote: >> In order to associate the SID used by LPAC to it's own domain and >> context bank we need a separate node on the DTS. > Can we use iommu-map instead of adding a new device using the same > addresses? You provide zero explanations, but it seems like you are > trying to separate a part of the GPU into a separate device, but it's > unnecessary. What I was trying to say is that we need to map sid0 and sid1 to different context banks. From what I recall, so long as we use the same dt node, the iommu drivert provides no way of doing this. What kgsl does is having a node for the iommu and then subnodes for gfx lpac and secure. The address on the lpac device doesn't really matter. I have very limted knowledge of DTSs but I think we could just leave it out altogether? > >> Add the code to look up that node on initialization. >> >> Signed-off-by: Anna Maniscalco >> --- >> drivers/gpu/drm/msm/adreno/adreno_gpu.c | 21 ++++++++++++++++++++- >> drivers/gpu/drm/msm/msm_gpu.h | 1 + >> 2 files changed, 21 insertions(+), 1 deletion(-) >> Best regards, -- Anna Maniscalco