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drm/msm: Limit command submission when no IOMMU 

Running the GPU without an IOMMU is not really a supported (or sane)
configuration.  Yet it can be useful during SoC bringup (ie. if the
iommu driver doesn't work yet).

Lets limit it to users who already have /dev/mem access, to avoid the
chance that a user accidentially configures kernel without IOMMU
support.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220502172908.3569799-1-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Rob Clark 2022-05-02 10:29:08 -07:00
parent b9b19980a1
commit 4a257ca694
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/msm/msm_gem_submit.c
View File

@ -734,6 +734,11 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
if (args->pad)
return -EINVAL;
if (unlikely(!ctx->aspace) && !capable(CAP_SYS_RAWIO)) {
DRM_ERROR_RATELIMITED("IOMMU support or CAP_SYS_RAWIO required!\n");
return -EPERM;
}
/* for now, we just have 3d pipe.. eventually this would need to
* be more clever to dispatch to appropriate gpu module:
*/