Re: [Intel-gfx] [PATCH v2 10/12] drm/i915/ttm: handle blitter failure on DG2

["Christian König" <christian.koenig@amd.com>]

Am 23.06.22 um 16:13 schrieb Matthew Auld:
> [SNIP]
>>> TTM_BO_VM_NUM_PREFAULT);
>>> +               /*
>>> +                * Ensure we check for any fatal errors if we had to
>>> move/clear
>>> +                * the object. The device should already be wedged if
>>> we hit
>>> +                * such an error.
>>> +                */
>>> +               if (i915_gem_object_wait_moving_fence(obj, true))
>>> +                       ret = VM_FAULT_SIGBUS;
>>
>> We should check with Christian here whether it's ok to export
>> ttm_bo_vm_fault_idle() as a helper, so that we release the proper locks
>> while waiting. The above is not a bug, but causes us to wait for the
>> moving fence under the mmap_lock, which is considered bad.
>
> Christian, any chance we can export ttm_bo_vm_fault_idle() for use 
> here? Or is that NACK?

Well question is why you want to do this? E.g. what's the background?

Regards,
Christian.