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[SCSI] libsas: Add an LU reset mechanism to the error handler 

After discussion with andmike and dougg, it seems that the purpose of
eh_device_reset_handler is to issue LU resets, and that
eh_bus_reset_handler would be a more appropriate place for a phy reset.

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 2007-01-29 23:48:19 -08:00 committed by James Bottomley
parent 423f7cf467
commit a9344e68ac
2 changed files with 38 additions and 5 deletions
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42
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -421,8 +421,29 @@ struct sas_phy *find_local_sas_phy(struct domain_device *dev)
return exphy->phy;
}
/* Attempt to send a target reset message to a device */
/* Attempt to send a LUN reset message to a device */
int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
struct domain_device *dev = cmd_to_domain_dev(cmd);
struct sas_internal *i =
to_sas_internal(dev->port->ha->core.shost->transportt);
struct scsi_lun lun;
int res;
int_to_scsilun(cmd->device->lun, &lun);
if (!i->dft->lldd_lu_reset)
return FAILED;
res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
return SUCCESS;
return FAILED;
}
/* Attempt to send a phy (bus) reset */
int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
{
struct domain_device *dev = cmd_to_domain_dev(cmd);
struct sas_phy *phy = find_local_sas_phy(dev);
@ -430,7 +451,7 @@ int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
res = sas_phy_reset(phy, 1);
if (res)
SAS_DPRINTK("Device reset of %s failed 0x%x\n",
SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
phy->dev.kobj.k_name,
res);
if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
@ -443,10 +464,20 @@ int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
static int try_to_reset_cmd_device(struct Scsi_Host *shost,
struct scsi_cmnd *cmd)
{
if (!shost->hostt->eh_device_reset_handler)
return FAILED;
int res;
return shost->hostt->eh_device_reset_handler(cmd);
if (!shost->hostt->eh_device_reset_handler)
goto try_bus_reset;
res = shost->hostt->eh_device_reset_handler(cmd);
if (res == SUCCESS)
return res;
try_bus_reset:
if (shost->hostt->eh_bus_reset_handler)
return shost->hostt->eh_bus_reset_handler(cmd);
return FAILED;
}
static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
@ -976,3 +1007,4 @@ EXPORT_SYMBOL_GPL(sas_task_abort);
EXPORT_SYMBOL_GPL(sas_phy_reset);
EXPORT_SYMBOL_GPL(sas_phy_enable);
EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);

1
include/scsi/libsas.h
View File

@ -661,5 +661,6 @@ void sas_init_dev(struct domain_device *);
void sas_task_abort(struct sas_task *);
int __sas_task_abort(struct sas_task *);
int sas_eh_device_reset_handler(struct scsi_cmnd *cmd);
int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd);
#endif /* _SASLIB_H_ */