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Mon, 02 Nov 2026 01:52:57 -0800 (PST) Received: from [192.168.226.248] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c4cabc18ec5sm364558866b.12.2026.11.02.01.52.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Nov 2026 01:52:56 -0800 (PST) Message-ID: Date: Mon, 2 Nov 2026 10:52:54 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] iommu/qcom: Invalidate the TLB in flush_iotlb_all To: Dmitry Baryshkov , Rob Clark , Will Deacon , Robin Murphy , "Joerg Roedel (AMD)" Cc: iommu@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20261031-msm-smmu-identity-v1-0-a2a70580eebd@oss.qualcomm.com> <20261031-msm-smmu-identity-v1-1-a2a70580eebd@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261031-msm-smmu-identity-v1-1-a2a70580eebd@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: SDycMITwlfV0gh1ZVr9_okqQjX40BJIg X-Proofpoint-Spam-Info: AW1haW4tMjYxMTAyMDAzOSBTYWx0ZWRfX4YS4RxhtpM1A +WFRNXcLYx3bgjbcPPMnAZtdVB4LK8vIEzHg60IK8oQMy8O1VrJOVa62ojXdq2YzLjrnX0GQOkO JSIALtqBcGhpm4bfBU50baQVJHLVIMs= X-Authority-Analysis: v=2.4 cv=ZbyIpcVA c=1 sm=1 tr=0 ts=6ae85d7a cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=1ACtxsPTqu74CH8WC9UA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTAyMDAzOSBTYWx0ZWRfX5957JCTyvfkI Vavvh3UFojJfQ0Ovnq6lr5djSYA20es9LDl9jEdrne8J1bbCAOi5nrSLHrzauwFe8Vkt7kdyWnT HLLkzpl0ytbZTXurP3jOhuWokBo3V+VJzsOwR1Mtd6GzMOjIjwPoZahOVfVWnNwnigA0C49cPji gUJyj97i1XxK0klOI+1wKf9M5EU3+ItuBoDnFKbHg8tXLQLd1Q6n3TrDr4j8obbOeVIqSOFuxQA VWxINPSfd8Ukt4mkzXs7LMWqdax8BF3oy4cagBkPfkGfX4chcid1vSLoRm4/mfMB6MFnbSddRfB vUrHe7NrlHbc7UpcihjJ/eSB1TO4kg29pmOjTve8hBhcYx1RCwfOzbce+gJNPcV1on4JS/dbirp 6gn41ouV8Nv4U9PJ+q44idCd+6ZsLc6Uf+uOQKd7D6U8JiFFesJF14qiciTanviRhdQoKu+dbmW hYydVXOOZG9KLSOklsw== X-Proofpoint-GUID: SDycMITwlfV0gh1ZVr9_okqQjX40BJIg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-02_03,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 clxscore=1015 bulkscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611020039 On 10/30/26 11:04 PM, Dmitry Baryshkov wrote: > qcom_iommu_flush_iotlb_all() only waits for a TLB sync and never > invalidates anything. iommu_unmap() users do not notice, since > io-pgtable invalidates each page through the gather, but drm/msm unmaps > with a NULL gather and relies on flush_iotlb_all. On db410c the GPU then > hangs on stale TLB entries as soon as another process reuses the IOVAs. > > Invalidate the whole context, as arm-smmu does, and keep iotlb_sync a > plain sync. > > Signed-off-by: Dmitry Baryshkov > --- Acked-by: Konrad Dybcio Konrad