[PATCH 1/1] drm/ttm: fix offset in VMAs with a pg_offs in ttm_bo_vm_access

[Deucher, Alexander]

[AMD Public Use]

Christian, Can you cc stable when you apply it to drm-misc?

Alex
________________________________
From: Kuehling, Felix <Felix.Kuehling at amd.com>
Sent: Wednesday, July 29, 2020 10:15 AM
To: Koenig, Christian <Christian.Koenig at amd.com>; dri-devel at lists.freedesktop.org <dri-devel at lists.freedesktop.org>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>; Deucher, Alexander <Alexander.Deucher at amd.com>
Cc: Morichetti, Laurent <Laurent.Morichetti at amd.com>
Subject: Re: [PATCH 1/1] drm/ttm: fix offset in VMAs with a pg_offs in ttm_bo_vm_access

Am 2020-07-29 um 4:08 a.m. schrieb Christian König:
> Am 28.07.20 um 20:27 schrieb Felix Kuehling:
>> VMAs with a pg_offs that's offset from the start of the vma_node need
>> to adjust the offset within the BO accordingly. This matches the
>> offset calculation in ttm_bo_vm_fault_reserved.
>>
>> Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
>> Tested-by: Laurent Morichetti <laurent.morichetti at amd.com>
>
> Reviewed-by: Christian König <christian.koenig at amd.com>
>
> Going to pick that up for inclusion in drm-misc-next.

Thanks. I'll submit it to amd-staging-drm-next so it makes its way into
our DKMS branch quickly.

Alex, would you push this to drm-fixes?

Regards,
  Felix


>
>> ---
>>   drivers/gpu/drm/ttm/ttm_bo_vm.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c
>> b/drivers/gpu/drm/ttm/ttm_bo_vm.c
>> index 389128b8c4dd..60b41447bec8 100644
>> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
>> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
>> @@ -405,8 +405,10 @@ static int ttm_bo_vm_access_kmap(struct
>> ttm_buffer_object *bo,
>>   int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
>>                void *buf, int len, int write)
>>   {
>> -    unsigned long offset = (addr) - vma->vm_start;
>>       struct ttm_buffer_object *bo = vma->vm_private_data;
>> +    unsigned long offset = (addr) - vma->vm_start +
>> +        ((vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node))
>> +         << PAGE_SHIFT);
>>       int ret;
>>         if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)
>
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