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[178.169.161.196]) by smtp.gmail.com with ESMTPSA id bo20sm38664655edb.1.2020.12.30.07.30.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Dec 2020 07:30:31 -0800 (PST) From: Iskren Chernev To: Rob Clark Cc: Akhil P Oommen , Bjorn Andersson , Brian Masney , Daniel Vetter , David Airlie , dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, Iskren Chernev , Jonathan Marek , Jordan Crouse , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Paul , Sharat Masetty , Shawn Guo , Wambui Karuga , ~postmarketos/upstreaming@lists.sr.ht Subject: [PATCH 2/2] drm/msm: Add modparam to allow vram carveout Date: Wed, 30 Dec 2020 17:29:43 +0200 Message-Id: <20201230152944.3635488-2-iskren.chernev@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201230152944.3635488-1-iskren.chernev@gmail.com> References: <20201230152944.3635488-1-iskren.chernev@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Using the GPU with a VRAM Carveout is a security vulnerability. Nevertheless it is sometimes required, especially when no IOMMU implementation is available for a certain platform. Signed-off-by: Iskren Chernev --- drivers/gpu/drm/msm/adreno/a2xx_gpu.c | 6 ++++-- drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 6 ++++-- drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 6 ++++-- drivers/gpu/drm/msm/adreno/adreno_device.c | 4 ++++ drivers/gpu/drm/msm/adreno/adreno_gpu.h | 1 + 5 files changed, 17 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c index 7e82c41a85f1a..bdc989183c648 100644 --- a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c @@ -534,8 +534,10 @@ struct msm_gpu *a2xx_gpu_init(struct drm_device *dev) if (!gpu->aspace) { dev_err(dev->dev, "No memory protection without MMU\n"); - ret = -ENXIO; - goto fail; + if (!allow_vram_carveout) { + ret = -ENXIO; + goto fail; + } } return gpu; diff --git a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c index 93da6683a8661..4534633fe7cdb 100644 --- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c @@ -564,8 +564,10 @@ struct msm_gpu *a3xx_gpu_init(struct drm_device *dev) * implement a cmdstream validator. */ DRM_DEV_ERROR(dev->dev, "No memory protection without IOMMU\n"); - ret = -ENXIO; - goto fail; + if (!allow_vram_carveout) { + ret = -ENXIO; + goto fail; + } } icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem"); diff --git a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c index c0be3a0f36b2c..82bebb40234de 100644 --- a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c @@ -692,8 +692,10 @@ struct msm_gpu *a4xx_gpu_init(struct drm_device *dev) * implement a cmdstream validator. */ DRM_DEV_ERROR(dev->dev, "No memory protection without IOMMU\n"); - ret = -ENXIO; - goto fail; + if (!allow_vram_carveout) { + ret = -ENXIO; + goto fail; + } } icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem"); diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c index 87c8b033ad1a6..12e75ba360f95 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_device.c +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c @@ -18,6 +18,10 @@ bool snapshot_debugbus = false; MODULE_PARM_DESC(snapshot_debugbus, "Include debugbus sections in GPU devcoredump (if not fused off)"); module_param_named(snapshot_debugbus, snapshot_debugbus, bool, 0600); +bool allow_vram_carveout = false; +MODULE_PARM_DESC(allow_vram_carveout, "Allow using VRAM Carveout, in place of IOMMU"); +module_param_named(allow_vram_carveout, allow_vram_carveout, bool, 0600); + static const struct adreno_info gpulist[] = { { .rev = ADRENO_REV(2, 0, 0, 0), diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h index c3775f79525a7..fe5444a1482ae 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h @@ -18,6 +18,7 @@ #include "adreno_pm4.xml.h" extern bool snapshot_debugbus; +extern bool allow_vram_carveout; enum { ADRENO_FW_PM4 = 0,