Add a sysfs attr that LLDD can configure it for every host. We made
a example in hisi_sas. Other LLDDs using libsas can implement it if
they want.
Suggested-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Jason Yan <yanaijie@xxxxxxxxxx>
CC: John Garry <john.garry@xxxxxxxxxx>
CC: Johannes Thumshirn <jthumshirn@xxxxxxx>
CC: Ewan Milne <emilne@xxxxxxxxxx>
CC: Christoph Hellwig <hch@xxxxxx>
CC: Tomas Henzl <thenzl@xxxxxxxxxx>
CC: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/scsi/hisi_sas/hisi_sas_main.c | 6 ++++++