[PATCH 4/4] drm/amdgpu: reset fpriv vram_lost_counter

Michel Dänzer michel at daenzer.net
Wed May 17 03:15:49 UTC 2017

On 17/05/17 12:04 PM, zhoucm1 wrote:
> On 2017年05月17日 09:18, Michel Dänzer wrote:
>> On 16/05/17 06:25 PM, Chunming Zhou wrote:
>>> Change-Id: I8eb6d7f558da05510e429d3bf1d48c8cec6c1977
>>> Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
>>> ---
>>>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 +++
>>>   include/uapi/drm/amdgpu_drm.h          | 1 +
>>>   2 files changed, 4 insertions(+)
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>> index bca1fb5..f3e7525 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>> @@ -2547,6 +2547,9 @@ int amdgpu_vm_ioctl(struct drm_device *dev,
>>> void *data, struct drm_file *filp)
>>>           amdgpu_vm_free_reserved_vmid(adev, &fpriv->vm, AMDGPU_GFXHUB);
>>>           break;
>>> +    case AMDGPU_VM_OP_RESET:
>>> +        fpriv->vram_lost_counter =
>>> atomic_read(&adev->vram_lost_counter);
>>> +        break;
>> How do you envision the UMDs using this? I can mostly think of them
>> calling this ioctl when a context is created or destroyed. But that
>> would also allow any other remaining contexts using the same DRM file
>> descriptor to use all ioctls again. So, I think there needs to be a
>> vram_lost_counter in struct amdgpu_ctx instead of in struct amdgpu_fpriv.
> struct amdgpu_fpriv for vram_lost_counter is proper place, especially
> for ioctl return value.
> if you need to reset ctx one by one, we can mark all contexts of that
> vm, and then reset by userspace.

I'm not following. With vram_lost_counter in amdgpu_fpriv, if any
context calls this ioctl, all other contexts using the same file
descriptor will also be considered safe again, right? So I'm still not
sure how this is supposed to be used by the UMDs. Can you describe your
idea for that?

>> It's hard to be sure whether that's workable for the UMD without at
>> least a working prototype...
> Totally agree, if you can help to do this in userspace, I'd like to
> support you from kernel side, or Christian.

I'm busy with other stuff.

Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

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