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 6c265660 ("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>
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7786ab6a
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