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[67.168.198.145]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8a98893d1f4sm294090b3a.12.2026.10.29.14.23.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 14:23:50 -0700 (PDT) From: Rob Clark To: iommu@lists.linux.dev Cc: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Dmitry Baryshkov , Rob Clark , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 2/2] iommu/msm: Use identity domain for GPU and display Date: Thu, 29 Oct 2026 14:23:43 -0700 Message-ID: <20261029212344.346069-3-robin.clark@oss.qualcomm.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261029212344.346069-1-robin.clark@oss.qualcomm.com> References: <20261029212344.346069-1-robin.clark@oss.qualcomm.com> 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 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI5MDA4NCBTYWx0ZWRfX8S1fVtCl517g iFh0fxUjDuv4ltCoZIYREof6hjPbLByk7fmBGtL+ei7Q+mY6t6+Bf4l872Py1DiUt+6YFnuHnaF uhsW8TkMEuZW3w+JUCOVIqIJlLj7wqnzEefgFJWPiT3SfQyIf2/dw1ZAhZseSKRP5NnQHtmTwe7 G5Ej9BQ4sv9mddiA2R11e3dnIgwJZ6eOqXEwto5nJIstZId/jVnb0dWhg5KqnGOTpgT9oxSvVzb 8VZMPR5T7TNZD/DDRCgVPMLHS8zBdHSBxcrglKvgoAgD6lLAmfkgXdFoNLoFGanCVDaz3V7L9pC cd+OnOKNPtLYbjJtxl98qOxPcIS5jt/3s4OOScEZFhBHjTxH9plP9kQZRxgl2x+V6VlW5O4fgFt Z8bC11bpNdJ/jCxj12+pSWdiJoWQ9KfUNT4CsXmcDSIsCY04HzG7xDNUE4LRjRMoThXQQPxZNKo BmvHYBhiy4TkMOCqw7g== X-Authority-Analysis: v=2.4 cv=E8tYNqdl c=1 sm=1 tr=0 ts=6ae3b967 cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=6Rn/7xRx7Ub4NEhlm8k1cw==:17 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=EUspDBNiAAAA:8 a=554yuftmPdPD4gaTNL8A:9 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI5MDA4NCBTYWx0ZWRfX2AS5qqatcUzX v/koPuyrYBS5N//sxoEZ1k9KUdcB9k81L0r4uMN1glhgksATV8QWCjnZoZx7zKHlorZN4n9VNhO 2ol4WLwEOJExr+k32DiyDetq4RAPJDM= X-Proofpoint-ORIG-GUID: 5Q5YPakhDHKWbPFCy7-8a6YfQpJ85c60 X-Proofpoint-GUID: 5Q5YPakhDHKWbPFCy7-8a6YfQpJ85c60 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=2026-10-29_06,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 adultscore=0 malwarescore=0 spamscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610290084 Similar to commit 0e764a01015d ("iommu/arm-smmu: Allow client devices to select direct mapping") for arm-smmu-qcom, match GPU and display compat strings to pick identity domain time. The drm/msm driver attaches it's own domain, which it manages directly, so we don't want an iommu managed domain interfering. Signed-off-by: Rob Clark --- drivers/iommu/msm_iommu.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c index 4ef1e8c8244b..1c5011432628 100644 --- a/drivers/iommu/msm_iommu.c +++ b/drivers/iommu/msm_iommu.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -691,12 +692,27 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) return 0; } +static const struct of_device_id msm_iommu_client_of_match[] = { + { .compatible = "qcom,adreno" }, + { .compatible = "qcom,mdp4" }, + { } +}; + +static int msm_iommu_def_domain_type(struct device *dev) +{ + const struct of_device_id *match = + of_match_device(msm_iommu_client_of_match, dev); + + return match ? IOMMU_DOMAIN_IDENTITY : 0; +} + static struct iommu_ops msm_iommu_ops = { .identity_domain = &msm_iommu_identity_domain, .domain_alloc_paging = msm_iommu_domain_alloc_paging, .probe_device = msm_iommu_probe_device, .device_group = generic_device_group, .of_xlate = qcom_iommu_of_xlate, + .def_domain_type = msm_iommu_def_domain_type, .default_domain_ops = &(const struct iommu_domain_ops) { .attach_dev = msm_iommu_attach_dev, .map_pages = msm_iommu_map, -- 2.56.0