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scsi: pm80xx: Add sysfs attribute to check controller hmi error

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A new sysfs variable 'ctl_hmi_error' is being introduced to give the error
details if the MPI initialization fails

Using the 'ctl_hmi_error' sysfs variable we can check the error details:

    linux-2dq0:~# cat /sys/class/scsi_host/host*/ctl_hmi_error
    0x00000000
    0x00000000
    0x00000000

Link: https://lore.kernel.org/r/20210415103352.3580-3-Viswas.G@microchip.com
Signed-off-by: Vishakha Channapattan <vishakhavc@google.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Ruksar Devadi <Ruksar.devadi@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Vishakha Channapattan 2021-04-15 16:03:46 +05:30 committed by Martin K. Petersen
parent 4ddbea1b6f
commit a4c55e16c5
1 changed files with 22 additions and 0 deletions
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22
drivers/scsi/pm8001/pm8001_ctl.c
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@ -911,6 +911,27 @@ static ssize_t ctl_mpi_state_show(struct device *cdev,
}
static DEVICE_ATTR_RO(ctl_mpi_state);
/**
* ctl_hmi_error_show - controller MPI initialization fails
* @cdev: pointer to embedded class device
* @buf: the buffer returned
*
* A sysfs 'read-only' shost attribute.
*/
static ssize_t ctl_hmi_error_show(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(cdev);
struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
unsigned int mpidw0;
mpidw0 = pm8001_mr32(pm8001_ha->general_stat_tbl_addr, 0);
return sysfs_emit(buf, "0x%08x\n", (mpidw0 >> 16));
}
static DEVICE_ATTR_RO(ctl_hmi_error);
struct device_attribute *pm8001_host_attrs[] = {
&dev_attr_interface_rev,
&dev_attr_controller_fatal_error,
@ -935,6 +956,7 @@ struct device_attribute *pm8001_host_attrs[] = {
&dev_attr_ila_version,
&dev_attr_inc_fw_ver,
&dev_attr_ctl_mpi_state,
&dev_attr_ctl_hmi_error,
NULL,
};