gallium/radeon: implement set_device_reset_callback

Check for device reset on flush. It would be nicer if the kernel just
reported this as an error on the submit ioctl (and similarly for fences),
but this will do for now.

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
4 files changed