[PATCH 5/5] drm/amdgpu: replace iova debugfs file with iomem

[Christian König]

Am 09.02.2018 um 14:32 schrieb Tom St Denis:
> On 02/02/18 02:09 PM, Christian König wrote:
>> [SNIP]
>> +        if (p->mapping != adev->mman.bdev.dev_mapping)
>> +            return -EPERM;
>
> This comparison fails for both IOMMU and non-IOMMU devices in my 
> carrizo+polaris10 box.
>
> The address being read from is what the VM decodes to (checked with 
> strace).

Have you applied the whole series? That patches before this one are 
necessary to initialize p->mapping when there isn't any userspace 
mapping for the page.

Christian.

>
> Tom