Commit 4a257ca6 authored by Rob Clark's avatar Rob Clark
Browse files

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: default avatarRob Clark <robdclark@chromium.org>
Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220502172908.3569799-1-robdclark@gmail.com


Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
parent b9b19980

drivers/gpu/drm/msm/msm_gem_submit.c

+5 −0
Original line number Diff line number Diff line
@@ -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:

	 */