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scsi: pm80xx: Add sysfs attribute to check MPI state

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A new sysfs variable 'ctl_mpi_state' is being introduced to check the state
of MPI.

Using the 'ctl_mpi_state' sysfs variable we can check the MPI state:

    linux-2dq0:~# cat /sys/class/scsi_host/host*/ctl_mpi_state
    MPI is successfully initialized

Link: https://lore.kernel.org/r/20210415103352.3580-2-Viswas.G@microchip.com
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.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: Ashokkumar N <Ashokkumar.N@microchip.com>
Signed-off-by: Radha Ramachandran <radha@google.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Vishakha Channapattan 2021-04-15 16:03:45 +05:30 committed by Martin K. Petersen
parent b3f0a1ee9e
commit 4ddbea1b6f
1 changed files with 31 additions and 1 deletions
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32
drivers/scsi/pm8001/pm8001_ctl.c
View file

@ -41,6 +41,7 @@
#include <linux/slab.h>
#include "pm8001_sas.h"
#include "pm8001_ctl.h"
#include "pm8001_chips.h"
/* scsi host attributes */
@ -879,9 +880,37 @@ static ssize_t pm8001_show_update_fw(struct device *cdev,
flash_error_table[i].err_code,
flash_error_table[i].reason);
}
static DEVICE_ATTR(update_fw, S_IRUGO|S_IWUSR|S_IWGRP,
pm8001_show_update_fw, pm8001_store_update_fw);
/**
* ctl_mpi_state_show - controller MPI state check
* @cdev: pointer to embedded class device
* @buf: the buffer returned
*
* A sysfs 'read-only' shost attribute.
*/
static const char *const mpiStateText[] = {
"MPI is not initialized",
"MPI is successfully initialized",
"MPI termination is in progress",
"MPI initialization failed with error in [31:16]"
};
static ssize_t ctl_mpi_state_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, "%s\n", mpiStateText[mpidw0 & 0x0003]);
}
static DEVICE_ATTR_RO(ctl_mpi_state);
struct device_attribute *pm8001_host_attrs[] = {
&dev_attr_interface_rev,
&dev_attr_controller_fatal_error,
@ -905,6 +934,7 @@ struct device_attribute *pm8001_host_attrs[] = {
&dev_attr_ob_log,
&dev_attr_ila_version,
&dev_attr_inc_fw_ver,
&dev_attr_ctl_mpi_state,
NULL,
};