[PATCH] drm/amdgpu: disable userptr if swiotlb is active

[Deucher, Alexander]

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Christian König <ckoenig.leichtzumerken at gmail.com>
Sent: Wednesday, February 20, 2019 8:46 AM
To: amd-gfx at lists.freedesktop.org
Subject: [PATCH] drm/amdgpu: disable userptr if swiotlb is active

Otherwise we can't be sure that we won't end up with a bounce buffer.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index d21dd2f369da..abc65633119b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -289,6 +289,10 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,
         if (offset_in_page(args->addr | args->size))
                 return -EINVAL;

+       /* We can't do this when swiotlb is active */
+       if (adev->needs_swiotlb)
+               return -ENXIO;
+
         /* reject unknown flag values */
         if (args->flags & ~(AMDGPU_GEM_USERPTR_READONLY |
             AMDGPU_GEM_USERPTR_ANONONLY | AMDGPU_GEM_USERPTR_VALIDATE |
--
2.17.1

_______________________________________________
amd-gfx mailing list
amd-gfx at lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20190220/30f03571/attachment.html>