[PATCH v3 1/7] pm80xx: Add sysfs attribute to check mpi state

[Viswas G <Viswas.G@microchip.com>]

From: Vishakha Channapattan <vishakhavc@google.com>

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 <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>
---
 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