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Subject[PATCH] drm/msm: Limit command submission when no IOMMU
From: Rob Clark <>

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

Signed-off-by: Rob Clark <>
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:
 \ /
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