Re: [PATCH] drm/msm: Limit command submission when no IOMMU

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On 02/05/2022 20:29, Rob Clark wrote:
From: Rob Clark <robdclark@xxxxxxxxxxxx>

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@xxxxxxxxxxxx>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

---
  drivers/gpu/drm/msm/msm_gem_submit.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 23b68bc945f6..9cd8c8708990 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -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:
  	 */


--
With best wishes
Dmitry



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