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Wed, 17 Jun 2026 09:20:56 -0700 (PDT) X-Received: by 2002:a05:6a20:c79a:b0:3aa:c93b:6266 with SMTP id adf61e73a8af0-3b8b64824a0mr5231159637.19.1781713255883; Wed, 17 Jun 2026 09:20:55 -0700 (PDT) Received: from [10.219.57.228] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c8661b5b207sm15074358a12.5.2026.06.17.09.20.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Jun 2026 09:20:55 -0700 (PDT) Message-ID: <1bf2708a-bd2a-46a9-97ea-8c1ad96e7ac3@oss.qualcomm.com> Date: Wed, 17 Jun 2026 21:50:50 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: kodiak: Add GEM_NOC interconnect for adreno SMMU To: Dmitry Baryshkov Cc: Will Deacon , Robin Murphy , Joerg Roedel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <20260526-smmu_interconnect_addition-v2-0-2a6d8ca30d63@oss.qualcomm.com> <20260526-smmu_interconnect_addition-v2-3-2a6d8ca30d63@oss.qualcomm.com> <26d51cbb-2d87-4564-b3c6-cc61ab900e19@oss.qualcomm.com> Content-Language: en-US From: Bibek Kumar Patro In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: tqx7C4I8hqk0yzzOcAFFVS45Z-jvmv8D X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE3MDE1NiBTYWx0ZWRfX2zEpRhh6JzBU o3Z0S/IvVfWFtbhrixEshLtKB/YGtRJEaYfTSJrcL33Xolx9TK5ZMsZBr70DP4TjYXRmZF8M7Gt N6w3sN1IZaqvllWp576PWEA2hnbGERY= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE3MDE1NiBTYWx0ZWRfX27LN6WnfmXH3 oBQlXcry23DdKQxUgE1KQ/7kR0Jh5V4UtwQYb9ta6nPh5XnyLwyGV9ZLwes0W3XEJx0cTm3wvIS Y5J3mk1W+EzBfEgzOzoUYJumUpXQeSmkGtl9Sf2TG9R1mM+U8SBzSlGjxF6sk6pOyxVOegp/QQy pkGDDMObYeOXW9+KgLIz409fAvpkn8j5r3ooDyQRrXd0dHf1OAEfMfswIEbfjKBD2uaSEkhkEgg YZkFH+UCgixvrAMhljI+XnxVo1wSTjkPIBtJZu5W6FKgHyWYq2NuEuI+L1Yx9jOkQDSF3EJIFa0 qvd0QVu41+Ow+C36GPOhZZrMIHbDxk3HTedeHHMdnzlzuyghHlzYJuoLxasUUr34U013EzrJ7wE IkTI3R5mcp3FXENY5XCLQyaCANNo2jvM6yWCLR3ly1pUGa3zhqlTc5qkKFa0kt8tYm1HXMEg0qH e5CAPoLO76ib4+mvhxg== X-Authority-Analysis: v=2.4 cv=PMw/P/qC c=1 sm=1 tr=0 ts=6a32c969 cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=Rg3GaRgnNXoUDx2UCPMA:9 a=QEXdDO2ut3YA:10 a=_Vgx9l1VpLgwpw_dHYaR:22 X-Proofpoint-ORIG-GUID: tqx7C4I8hqk0yzzOcAFFVS45Z-jvmv8D X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-17_02,2026-06-17_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606170156 On 6/16/2026 5:49 AM, Dmitry Baryshkov wrote: > On Mon, Jun 08, 2026 at 08:07:07PM +0530, Bibek Kumar Patro wrote: >> >> >> On 6/8/2026 7:27 PM, Dmitry Baryshkov wrote: >>> On Tue, May 26, 2026 at 08:12:04PM +0530, Bibek Kumar Patro wrote: >>>> On Kodiak platforms, the Adreno SMMU requires a bandwidth vote on >>>> the GEM_NOC path (MASTER_GPU_TCU -> SLAVE_EBI1) before its registers >>>> are accessible. Without this vote, the SMMU may become unreachable, >>>> leading to intermittent probe failures and runtime issues. >>>> >>>> Add the required interconnect to ensure reliable register access. >>> >>> Does it only concern the GPU SMMU? What about the APPS SMMU? Should it >>> be voting on other interconnects too? I guess so, because currently I >>> see that TBUs vote for various interconnects. BTW: should apps_smmu also >>> vote on the power domains? >>> >> >> This race mainly occurs in GPU SMMU, where the GDSC can have an >> independent vote on the Adreno SMMU. However, the GEM_NOC vote may >> already have been removed by the GPU (or any consumer of adreno_smmu, >> e.g gmu), unless it is explicitly voted by the GPU SMMU (which acts as a >> supplier for the GPU). This mismatch can lead to SHUB timeouts or NoC >> errors. >> >> Mostly this race reported in suspend/resume cycle (when gpu/gmu devices >> moves to slumber/suspend state before adreno_smmu powers down >> and the later doesn't have explicit interconnect voting). >> >> In the case of APPS SMMU, such a race is not expected for any known >> use case. APPS SMMU is part of a shared infrastructure block, and its >> power is typically kept enabled as long as attached master devices are >> active. Therefore, explicit power-domain voting from APPS SMMU may not >> be required. > > This looks like a good part of the commit message. Please add it where > it belongs. > Ack, thanks for this suggestion. It seems like i haven't explained this specific info in any of the patches in this series. Will take care of this in the next revision. Thanks & regards, Bibek >> >> Thanks, >> Bibek >> >> >>>> >>>> Signed-off-by: Bibek Kumar Patro >>>> --- >>>> arch/arm64/boot/dts/qcom/kodiak.dtsi | 2 ++ >>>> 1 file changed, 2 insertions(+) >>>> >>>> diff --git a/arch/arm64/boot/dts/qcom/kodiak.dtsi b/arch/arm64/boot/dts/qcom/kodiak.dtsi >>>> index fa540d8c2615dc02d941eb16bc7253204c2750bd..eefa4b836a81374ff437ab4bbcbc3fecc1590ab6 100644 >>>> --- a/arch/arm64/boot/dts/qcom/kodiak.dtsi >>>> +++ b/arch/arm64/boot/dts/qcom/kodiak.dtsi >>>> @@ -3386,6 +3386,8 @@ adreno_smmu: iommu@3da0000 { >>>> power-domains = <&gpucc GPU_CC_CX_GDSC>; >>>> dma-coherent; >>>> + interconnects = <&gem_noc MASTER_GPU_TCU QCOM_ICC_TAG_ALWAYS >>>> + &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>; >>>> }; >>>> gfx_0_tbu: tbu@3dd9000 { >>>> >>>> -- >>>> 2.34.1 >>>> >>> >> >