[PATCH 0/6] Properly detect swiotlb.

[Alex Deucher]

On Wed, Aug 26, 2015 at 2:52 PM,  <jglisse at redhat.com> wrote:
> So this is only build tested as i am away from hardware right now.
> Idea is to provide reliable way to check if swiotlb is in use for
> a device or not. It seems swiotlb_nr_tbl() is no longer reliable
> for that.
>
> Please test.

Even with these patches applied, we are still ending up in the
ttm_dma_populate() path in the amdgpu driver rather than
ttm_pool_populate() even with a hw iommu enabled.  Any idea?

The attached patch gives us a 20% performance boost in some apps, but
obviously has potential issues if a hw iommu is not present.

Alex

>
> Cheers,
> Jérôme Glisse
> _______________________________________________
> dri-devel mailing list
> dri-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-drm-amdgpu-use-ttm_pool-instead-of-ttm_dma.patch
Type: text/x-patch
Size: 1320 bytes
Desc: not available
URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20150831/e403de42/attachment.bin>