Re: cleaning unfenced buffer

[<th...@tu...>]

Jerome Glisse wrote:

>Hi,
>
>If my driver emit fence function fail should there be a way
>to clean unfenced buffer ? Or should i do this by myself in
>the function which validate buffer ? If so then i915 execbuffer
>is likely buggy in this regards (don't try to unload module
>then as it will trigger BUG_ON(!list_empty(&bm->unfenced))
>
>Cheers,
>Jerome Glisse
>
>  
>
Hi.
If fencing fails, the function that validates the buffer must clean the 
unfenced list.
There is a function to clean the unfenced list in drm_bo.c.

This is typically called if the function receives a signal while waiting 
to validate a buffer, which is a very common case if the X server is the 
caller.

If command submission has already occured when fencing fails,
the calling function must wait for GPU idle before cleaning the list.

/Thomas

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