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Thu, 18 Jun 2026 02:26:37 -0700 (PDT) X-Received: by 2002:a05:620a:458a:b0:90d:11b2:80f3 with SMTP id af79cd13be357-91f2b477d71mr290814085a.7.1781774796807; Thu, 18 Jun 2026 02:26:36 -0700 (PDT) Received: from [192.168.120.170] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bfdb83428a8sm925516266b.44.2026.06.18.02.26.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 18 Jun 2026 02:26:35 -0700 (PDT) Message-ID: <3384ecdf-599f-4862-a3c4-9f54b4ddfe63@oss.qualcomm.com> Date: Thu, 18 Jun 2026 11:26:33 +0200 Precedence: bulk X-Mailing-List: devicetree@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: Bibek Kumar Patro , 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: Konrad Dybcio In-Reply-To: <26d51cbb-2d87-4564-b3c6-cc61ab900e19@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=YbmNIQRf c=1 sm=1 tr=0 ts=6a33b9ce cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=HaZQysj9wVKA4b69cM0A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE4MDA4NiBTYWx0ZWRfX3VXyeKfB4eoU 0M1u6eLRXy3DpqRDb0Q0mBspib+TigOlAMeGkjkNZXvdlMmNlQ6MMVodExDKOp1vu5k/s/2KqfT ShASj4TKSMuTorrPgP6uAL8acTqgEKE= X-Proofpoint-GUID: oDkQo4arUALRB_-l0tg_paMLYLF2ZbqA X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE4MDA4NiBTYWx0ZWRfX31mXWweglQg5 lMB77O/xzZMpz6BbbMsJaEZ5TjhWHJg3O9NEnf5plmlKkOGWvALK/WUrWF0vZx5vvDMISEzMMqs 97RTh9hchYPznMA9LhMzpGezEuiIgIkNJlkAbl0HSy1fXdoXO8PU3sNwd1Sd00TNeI/00VUtyvW BbYz3bFVaY+hUqq00jtp0Ycp7IVd8slJOwMaiQvpQx+sJ3G0T3cyQJE2rErkP2PTA4uOIqOvtCQ BhAOUYwcB5x5Un5o+UJCiz6w+C08/PSuWW2xk4i889IlkKqewibe2no60WLBb4at9PEAcFgc97d oobaAKuZq2Hgwepc/A1YR1dH7eoR2Zzc4+T1sDxeId7E2xSDI8oz5qtNbiMm4jj5qEiBWViXT6u We/qa3N2SZ18HNnCeU88EDCrxhsej+JEUtabdTxAnFyCHSgLnWXZ1Fsci/uewaN7YNKxC+BHVbJ pP6VnImnK7fZPXg3h4w== X-Proofpoint-ORIG-GUID: oDkQo4arUALRB_-l0tg_paMLYLF2ZbqA 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=2026-06-18_01,2026-06-17_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 clxscore=1015 impostorscore=0 spamscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606180086 On 6/8/26 4:37 PM, 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 Mainly or exclusively? Konrad > 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. > > 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 >>> >> > >