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Tue, 24 Mar 2026 14:40:39 -0700 (PDT) X-Received: by 2002:a17:903:183:b0:2b0:62dd:3a9f with SMTP id d9443c01a7336-2b0b0a7504dmr11689135ad.34.1774388438860; Tue, 24 Mar 2026 14:40:38 -0700 (PDT) Received: from localhost ([2601:1c0:5000:d5c:4ec8:83f5:8254:6891]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b08366c56bsm222384605ad.57.2026.03.24.14.40.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 14:40:38 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 1/2] drm/msm: Disallow foreign mapping of _NO_SHARE Date: Tue, 24 Mar 2026 14:40:31 -0700 Message-ID: <20260324214033.1219113-1-robin.clark@oss.qualcomm.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI0MDE2NyBTYWx0ZWRfX7tTS621E4Q6z sPVhmJ148KbtGQVuWqRoOg/hUXDcfNBy/dcDYOA/Iu1+H9DXgK/8y7WurbFOV5lyekRhkKv2Nxf rLl5D4+XsSR/Zh/d89z97oEHohtmsg0vcgJAcjIxd0jhwQjWs1Yde3BJrZHc6fSlUUPGJ8LyH2t ZBXD89cX1BtfqwCenTIsk1rkKg5iKXzH+s7gweJVWSBMS5URrkGcg+3ppkDWKGlZUZSt5L/RZbv V27Necrh/2hwJ1NfG+wsBIugWFZv5tCyTpdNsGKBNyBLSkdnBCKmtRbo2QoxzEDHr5qsuRo4C0r VRLEIxvIHa7RmDVH5A7qRDzliI5L+yVX0b1IdReRsXeZN66GISnrMUAqQ10miQJ39bhOpBijXZM WdWATXu4LTGoMsKcFXVVBQ/4Rf8ENnVTFrA762szQA4SlpzpZoBZwDJUhXbMR2g5HTnjb1UOC3G zPu3/s/eeZwS1eYOb6w== X-Proofpoint-GUID: 7OFps6ffrCdSmrJPk7p384ijA21dE7PL X-Proofpoint-ORIG-GUID: 7OFps6ffrCdSmrJPk7p384ijA21dE7PL X-Authority-Analysis: v=2.4 cv=Bd/VE7t2 c=1 sm=1 tr=0 ts=69c304d8 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=xqWC_Br6kY4A:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=h5gromtfd8Ev_kILMJ0A:9 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-24_03,2026-03-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 bulkscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603240167 This restriction applies to mapping of _NO_SHARE objs in the kms vm as well as importing/exporting BOs. Since the DPU has it's own VM, scanout counts as "exporting" a BO from outside of it's host VM. Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_gem_vma.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c index 1c6b0920c0d8..68a8f8f592fb 100644 --- a/drivers/gpu/drm/msm/msm_gem_vma.c +++ b/drivers/gpu/drm/msm/msm_gem_vma.c @@ -373,6 +373,12 @@ msm_gem_vma_new(struct drm_gpuvm *gpuvm, struct drm_gem_object *obj, struct msm_gem_vma *vma; int ret; + /* _NO_SHARE objs cannot be mapped outside of their "host" vm: */ + if ((to_msm_bo(obj)->flags & MSM_BO_NO_SHARE) && + GEM_WARN_ON(obj->resv != drm_gpuvm_resv(gpuvm))) { + return ERR_PTR(-EINVAL); + } + drm_gpuvm_resv_assert_held(&vm->base); vma = kzalloc(sizeof(*vma), GFP_KERNEL); -- 2.53.0