Xiang Chen b1a49412f0
scsi: hisi_sas: optimise the usage of hisi_hba.lock ...
Currently hisi_hba.lock is locked to deliver and receive a command
to/from any hw queue. This causes much contention at high data-rates.
To boost performance, lock on a per queue basis for sending and
receiving commands to/from hw.
Certain critical regions still need to be locked in the delivery and
completion stages with hisi_hba.lock.
New element hisi_sas_device.dq is added to store the delivery queue for
a device, so it does not need to be needlessly re-calculated for every
task.
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com >
Signed-off-by: John Garry <john.garry@huawei.com >
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com >
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