[PATCH v3 1/7] pm80xx: Add sysfs attribute to check mpi state
From: Viswas G <hidden>
Date: 2021-03-30 06:31:07
Subsystem:
pmc sierra pm8001 driver, scsi subsystem, the rest · Maintainers:
Jack Wang, "James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
From: Vishakha Channapattan <redacted> A new sysfs variable 'ctl_mpi_state' is being introduced to check the state of mpi. Tested: Using 'ctl_mpi_state' sysfs variable we check the mpi state mvae14:~# cat /sys/class/scsi_host/host*/ctl_mpi_state MPI-S=MPI is successfully initialized HMI_ERR=0 MPI-S=MPI is successfully initialized HMI_ERR=0 Reported-by: kernel test robot <redacted> Reported-by: Dan Carpenter <redacted> Signed-off-by: Vishakha Channapattan <redacted> Signed-off-by: Viswas G <redacted> Signed-off-by: Ruksar Devadi <redacted> Signed-off-by: Ashokkumar N <redacted> Signed-off-by: Radha Ramachandran <redacted> Signed-off-by: kernel test robot <redacted> --- drivers/scsi/pm8001/pm8001_ctl.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/pm8001/pm8001_ctl.c b/drivers/scsi/pm8001/pm8001_ctl.c
index 12035baf0997..6b6b774c455e 100644
--- a/drivers/scsi/pm8001/pm8001_ctl.c
+++ b/drivers/scsi/pm8001/pm8001_ctl.c@@ -41,6 +41,7 @@ #include <linux/slab.h> #include "pm8001_sas.h" #include "pm8001_ctl.h" +#include "pm8001_chips.h" /* scsi host attributes */
@@ -883,9 +884,40 @@ 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 char mpiStateText[][80] = { + "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; + int c; + + mpidw0 = pm8001_mr32(pm8001_ha->general_stat_tbl_addr, 0); + c = sysfs_emit(buf, "MPI-S=%s\t HMI_ERR=%x\n", mpiStateText[mpidw0 & 0x0003], + (mpidw0 >> 16)); + return c; +} +static DEVICE_ATTR_RO(ctl_mpi_state); + struct device_attribute *pm8001_host_attrs[] = { &dev_attr_interface_rev, &dev_attr_controller_fatal_error,
@@ -909,6 +941,7 @@ 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, };
--
2.16.3