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[SCSI] hpsa: allow user to disable accelerated i/o path

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Allow SSD Smart Path for a controller to be disabled by
the user, regardless of settings in controller firmware
or array configuration.

To disable:     echo 0 > /sys/class/scsi_host/host<id>/acciopath_status
To re-enable:   echo 1 > /sys/class/scsi_host/host<id>/acciopath_status
To check state: cat /sys/class/scsi_host/host<id>/acciopath_status

Signed-off-by: Scott Teel <scott.teel@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Scott Teel
2014-02-18 13:57:00 -06:00
committed by James Bottomley
parent 6b80b18fe5
commit da0697bd30
3 changed files with 61 additions and 1 deletions
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drivers/scsi/hpsa.h
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@@ -181,6 +181,7 @@ struct ctlr_info {
#define HPSATMF_LOG_QRY_TSET (1 << 24)
#define HPSATMF_LOG_QRY_ASYNC (1 << 25)
u32 events;
int acciopath_status;
};
#define HPSA_ABORT_MSG 0
#define HPSA_DEVICE_RESET_MSG 1