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drm/msm: Add modparam to allow vram carveout 

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 <iskren.chernev@gmail.com>
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Iskren Chernev 2020-12-30 17:29:43 +02:00 committed by Rob Clark
parent d863f0c7b5
commit 3f7759e7b7
5 changed files with 17 additions and 6 deletions
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6
drivers/gpu/drm/msm/adreno/a2xx_gpu.c
View File

@ -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;

6
drivers/gpu/drm/msm/adreno/a3xx_gpu.c
View File

@ -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");

6
drivers/gpu/drm/msm/adreno/a4xx_gpu.c
View File

@ -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");

4
drivers/gpu/drm/msm/adreno/adreno_device.c
View File

@ -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),

1
drivers/gpu/drm/msm/adreno/adreno_gpu.h
View File

@ -18,6 +18,7 @@
#include "adreno_pm4.xml.h"
extern bool snapshot_debugbus;
extern bool allow_vram_carveout;
enum {
ADRENO_FW_PM4 = 0,