Commit 4c15442d authored by Arun Easi's avatar Arun Easi Committed by Martin K. Petersen
Browse files

scsi: qla2xxx: Add host attribute to trigger MPI hang 

Add a mechanism to trigger MPI pause for debugging purposes.

Link: https://lore.kernel.org/r/20210810043720.1137-2-njavali@marvell.com


Reviewed-by: default avatarHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: default avatarArun Easi <aeasi@marvell.com>
Signed-off-by: default avatarNilesh Javali <njavali@marvell.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 9757f8af

drivers/scsi/qla2xxx/qla_attr.c

+25 −0
Original line number Diff line number Diff line
@@ -1887,6 +1887,30 @@ qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr, 
	return scnprintf(buf, PAGE_SIZE, "%s\n", spd[ha->link_data_rate]);

}



static ssize_t

qla2x00_mpi_pause_store(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t count)

{

	scsi_qla_host_t *vha = shost_priv(class_to_shost(dev));

	int rval = 0;



	if (sscanf(buf, "%d", &rval) != 1)

		return -EINVAL;



	ql_log(ql_log_warn, vha, 0x7089, "Pausing MPI...\n");



	rval = qla83xx_wr_reg(vha, 0x002012d4, 0x30000001);



	if (rval != QLA_SUCCESS) {

		ql_log(ql_log_warn, vha, 0x708a, "Unable to pause MPI.\n");

		count = 0;

	}



	return count;

}



static DEVICE_ATTR(mpi_pause, S_IWUSR, NULL, qla2x00_mpi_pause_store);



/* ----- */



static ssize_t
@@ -2482,6 +2506,7 @@ struct device_attribute *qla2x00_host_attrs[] = { 
	&dev_attr_fw_attr,

	&dev_attr_dport_diagnostics,

	&dev_attr_edif_doorbell,

	&dev_attr_mpi_pause,

	NULL, /* reserve for qlini_mode */

	NULL, /* reserve for ql2xiniexchg */

	NULL, /* reserve for ql2xexchoffld */