In order to support 32-bit systems, the 8B doorbell write should be
done by 2 4B stores.
The order between the store is important, that's why memory barrier
should be used between them.
The doorbell address is shared between all the queues, that's why a lock
should wrap the 2 stores.
Signed-off-by: Matan Azrad <matan@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
37862dafcb