On 7/15/20 1:51 PM, Chris Wilson wrote:
The prospect of locking the entire submission sequence under a wide ww_mutex re-imposes some key restrictions, in particular that we must not call copy_(from|to)_user underneath the mutex (as the faulthandlers themselves may need to take the ww_mutex). To satisfy this requirement, we need to split the relocation handling into multiple phases again. After dropping the reservations, we need to allocate enough buffer space to both copy the relocations from userspace into, and serve as the relocation command buffer. Once we have finished copying the relocations, we can then re-aquire all the objects for the execbuf and rebind them, including our new relocations objects. After we have bound all the new and old objects into their final locations, we can then convert the relocation entries into the GPU commands to update the relocated vma. Finally, once it is all over and we have dropped the ww_mutex for the last time, we can then complete the update of the user relocation entries. Signed-off-by: Chris Wilson <[email protected]>
Tvrtko had some issues with this patch when submitted as part of a previous series, and they don't seem addressed.
/Thomas _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
