New registers.
Currently uncertain how exactly to mask fault buffer interrupts. This will
likely be corrected at around the same time as the new MC interrupt stuff
has been properly figured out and implemented.
For the moment, it shouldn't matter too much.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
The GPU will continually fire interrupts while a fault buffer GET != PUT,
and to stop the spurious interrupts while the handler does its thing, we
were disabling the fault buffer temporarily.
This is not actually a great idea to begin with, and made worse by Volta
resetting GET/PUT when it's reactivated. So, let's not do that.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
