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[67.168.198.145]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ae6e7d5b8csm10255599a91.1.2026.10.30.14.33.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 14:33:03 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Jianfeng Liu , =?UTF-8?q?Christian=20K=C3=B6nig?= , Dmitry Baryshkov , Rob Clark , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v4 6/6] drm/msm: Treat !mapped as an error Date: Fri, 30 Oct 2026 14:32:48 -0700 Message-ID: <20261030213251.55365-7-robin.clark@oss.qualcomm.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261030213251.55365-1-robin.clark@oss.qualcomm.com> References: <20261030213251.55365-1-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-GUID: bIddJc_9FGdQjeTu3g9a6qvyj4nYY-r9 X-Proofpoint-ORIG-GUID: bIddJc_9FGdQjeTu3g9a6qvyj4nYY-r9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDMwMDA4NSBTYWx0ZWRfX7IiXQk0TuNlQ Xp5NNbJSHZFNtxqHhvpyJxOLC+DmkJBo6ET3QPY20xcdwgGRexUcxSrRKMmjY+nbxMUdKSr1K9m YDyUoJy878zEwSQ7gn8hU4C5nhs/fdmr95QW266mwo5ru1/HFyqiCPkh5DuhELxGQMKgxbSZbWT PHkFjWuOe/gtac7mSN2vtvs5pcK4xTtgvVfkt97XvKooEba0FqnffHG9f+/JvxegfIP1onAFANr f+UWM/Acj4cKDGTn2WJAHFFdFdoOiWXMfNAGE7c2XJYP+ifjOSqI7JhicjtM7r8bMZ1NR8Bodvy zxyuI270RnGyvl/pa0uwSx/gln9KGQc1phKssp/omAzEfyg9ZV0qFPZmN7Orc5dJMPM0xV3zUdk mHNvpTCH3Ib3sESyQYo4ZqbiSVtQT79JsoaMtxyVMRStkMPn/xL4CnwDpucU+SdZAuB1lsBSplM 6/McRqCHWXxUQ2U1Bow== X-Authority-Analysis: v=2.4 cv=R92WitRX c=1 sm=1 tr=0 ts=6ae50d11 cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=6Rn/7xRx7Ub4NEhlm8k1cw==:17 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=IbsCIv0Bno-BzyZ2rGMA:9 a=_Vgx9l1VpLgwpw_dHYaR:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDMwMDA4NSBTYWx0ZWRfXynhxPYiZI9FE Vp9aH+SMSCo920LQoiISKCwjgQ4t4+vrDAC719IWPa6BRRP2LsyK25wrvk5GsJbiLYc7rQVlU0G caw8FO6Ii4W7pDbPum+jf8u3/ahzoe8= 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=2026-10-30_06,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2610300085 Rather than silenty mapping nothing, treat this as an error. It should never happen, but if it does we want to flag the VM as unusable. Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_iommu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c index c2950d32c507..255972323f9a 100644 --- a/drivers/gpu/drm/msm/msm_iommu.c +++ b/drivers/gpu/drm/msm/msm_iommu.c @@ -186,6 +186,10 @@ __do_map(unsigned long pgsize_bitmap, u64 iova, struct sg_table *sgt, size_t off size -= mapped; len -= mapped; + /* If nothing was mapped, consider it an ENOMEM. */ + if (!ret && !mapped) + ret = -ENOMEM; + if (ret) { __do_unmap(pgsize_bitmap, iova, addr - iova, arg, ops); return -EINVAL; -- 2.56.0