mpt3sas: sysfs attribute to report Backup Rail Monitor Status
authorSreekanth Reddy <sreekanth.reddy@avagotech.com>
Wed, 11 Nov 2015 12:00:29 +0000 (17:30 +0530)
committerMartin K. Petersen <martin.petersen@oracle.com>
Wed, 11 Nov 2015 23:56:21 +0000 (18:56 -0500)
commit422630955ea34841a2a074cb6734ec5d70758b0d
treed8a46831c5d2ececaa1ede81e0dabf423e8f1a78
parent7786ab6aff9cea97eb0a8d67705c68e97a664bf3
mpt3sas: sysfs attribute to report Backup Rail Monitor Status

A new sysfs shost attribute called "BMR_status" is implemented to report
Backup Rail Monitor status.

This attribute is located in:

        /sys/class/scsi_host/host#/BMR_status

When reading this adapter attribute, the driver will output the state of
GPIO[24]. It returns "0" if BMR is healthy and "1" for failure.

If it returns an empty string then it means that there was an error
while obtaining the BMR status. Check dmesg for what error has occurred.

This sysfs shost attribute is mainly for WarpDrive controllers.

This commit is a port of 6c265660c262 ("mpt2sas: Provide sysfs attribute
to report Backup Rail Monitor Status").

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
drivers/scsi/mpt3sas/mpt3sas_base.h
drivers/scsi/mpt3sas/mpt3sas_config.c
drivers/scsi/mpt3sas/mpt3sas_ctl.c