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[SCSI] libsas: Add a sysfs knob to enable/disable a phy

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This patch lets a user arbitrarily enable or disable a phy via sysfs.
Potential applications include shutting down a phy to replace one
lane of wide port, and (more importantly) providing a method for the
libata SATL to control the phy.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Darrick J. Wong
2007-01-11 14:14:57 -08:00
committed by James Bottomley
parent b218a0d8e2
commit acbf167d4a
5 changed files with 90 additions and 2 deletions
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2
include/scsi/scsi_transport_sas.h
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@ -54,6 +54,7 @@ struct sas_identify {
struct sas_phy {
struct device dev;
int number;
int enabled;
/* phy identification */
struct sas_identify identify;
@ -163,6 +164,7 @@ struct sas_function_template {
int (*get_enclosure_identifier)(struct sas_rphy *, u64 *);
int (*get_bay_identifier)(struct sas_rphy *);
int (*phy_reset)(struct sas_phy *, int);
int (*phy_enable)(struct sas_phy *, int);
int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *);
};