scsi: hisi_sas: optimise the usage of hisi_hba.lock

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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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Xiang Chen 2017-06-14 23:33:13 +08:00 • committed by Martin K. Petersen

parent ad6048325c

commit b1a49412f0

4 changed files with 77 additions and 58 deletions

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9

drivers/scsi/hisi_sas/hisi_sas.h

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69

drivers/scsi/hisi_sas/hisi_sas_main.c

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23

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c

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34

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

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