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

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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.



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