Commit 4ddbea1b authored by Vishakha Channapattan's avatar Vishakha Channapattan Committed by Martin K. Petersen
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scsi: pm80xx: Add sysfs attribute to check MPI state 

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: default avatarkernel test robot <lkp@intel.com>
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarVishakha Channapattan <vishakhavc@google.com>
Signed-off-by: default avatarViswas G <Viswas.G@microchip.com>
Signed-off-by: default avatarRuksar Devadi <Ruksar.devadi@microchip.com>
Signed-off-by: default avatarAshokkumar N <Ashokkumar.N@microchip.com>
Signed-off-by: default avatarRadha Ramachandran <radha@google.com>
Signed-off-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent b3f0a1ee

drivers/scsi/pm8001/pm8001_ctl.c

+31 −1
Original line number Diff line number Diff line
@@ -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,

};