linux-kernel - [PATCH 1/3] drm/msm/mdp4: stop supporting no-IOMMU configuration

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250706-msm-no-iommu-v1-1-9e8274b30c33@oss.qualcomm.com>
Date: Sun, 06 Jul 2025 13:50:36 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Antonino Maniscalco <antomani103@...il.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] drm/msm/mdp4: stop supporting no-IOMMU configuration

With the switch to GPUVM the msm driver no longer supports the no-IOMMU
configurations (even without the actual GPU). Return an error in case we
face the lack of the IOMMU for an MDP4 device.

Fixes: 111fdd2198e6 ("drm/msm: drm_gpuvm conversion")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
index 0952c7f18abdca4a7e24e5af8a7132456bfec129..88296c41d1a5eb0e16cb6ec4d0475000b6318c4e 100644
--- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
@@ -463,9 +463,9 @@ static int mdp4_kms_init(struct drm_device *dev)
 		ret = PTR_ERR(mmu);
 		goto fail;
 	} else if (!mmu) {
-		DRM_DEV_INFO(dev->dev, "no iommu, fallback to phys "
-				"contig buffers for scanout\n");
-		vm = NULL;
+		DRM_DEV_INFO(dev->dev, "no IOMMU configuration is no longer supported\n");
+		ret = -ENODEV;
+		goto fail;
 	} else {
 		vm  = msm_gem_vm_create(dev, mmu, "mdp4",
 					0x1000, 0x100000000 - 0x1000,

-- 
2.39.5