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Reviewed-by: Alex Deucher <alexander.deucher@amd.com><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> amd-gfx <amd-gfx-bounces@lists.freedesktop.org> on behalf of Christian König <ckoenig.leichtzumerken@gmail.com><br>
<b>Sent:</b> Wednesday, February 20, 2019 8:46 AM<br>
<b>To:</b> amd-gfx@lists.freedesktop.org<br>
<b>Subject:</b> [PATCH] drm/amdgpu: disable userptr if swiotlb is active</font>
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<div class="PlainText">Otherwise we can't be sure that we won't end up with a bounce buffer.<br>
<br>
Signed-off-by: Christian König <christian.koenig@amd.com><br>
---<br>
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 4 ++++<br>
1 file changed, 4 insertions(+)<br>
<br>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c<br>
index d21dd2f369da..abc65633119b 100644<br>
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c<br>
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c<br>
@@ -289,6 +289,10 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,<br>
if (offset_in_page(args->addr | args->size))<br>
return -EINVAL;<br>
<br>
+ /* We can't do this when swiotlb is active */<br>
+ if (adev->needs_swiotlb)<br>
+ return -ENXIO;<br>
+<br>
/* reject unknown flag values */<br>
if (args->flags & ~(AMDGPU_GEM_USERPTR_READONLY |<br>
AMDGPU_GEM_USERPTR_ANONONLY | AMDGPU_GEM_USERPTR_VALIDATE |<br>
-- <br>
2.17.1<br>
<br>
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