scsi: megaraid_sas: Export RAID map id through sysfs

Add a sysfs interface to get the raid map index that is being used by
driver.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 202d5ce..ed38cec 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -3274,6 +3274,18 @@ megasas_dump_system_regs_show(struct device *cdev,
        return megasas_dump_sys_regs(instance->reg_set, buf);
 }
 
+static ssize_t
+megasas_raid_map_id_show(struct device *cdev, struct device_attribute *attr,
+                         char *buf)
+{
+       struct Scsi_Host *shost = class_to_shost(cdev);
+       struct megasas_instance *instance =
+                       (struct megasas_instance *)shost->hostdata;
+
+       return snprintf(buf, PAGE_SIZE, "%ld\n",
+                       (unsigned long)instance->map_id);
+}
+
 static DEVICE_ATTR(fw_crash_buffer, S_IRUGO | S_IWUSR,
        megasas_fw_crash_buffer_show, megasas_fw_crash_buffer_store);
 static DEVICE_ATTR(fw_crash_buffer_size, S_IRUGO,
@@ -3288,6 +3300,8 @@ static DEVICE_ATTR(fw_cmds_outstanding, S_IRUGO,
        megasas_fw_cmds_outstanding_show, NULL);
 static DEVICE_ATTR(dump_system_regs, S_IRUGO,
        megasas_dump_system_regs_show, NULL);
+static DEVICE_ATTR(raid_map_id, S_IRUGO,
+       megasas_raid_map_id_show, NULL);
 
 struct device_attribute *megaraid_host_attrs[] = {
        &dev_attr_fw_crash_buffer_size,
@@ -3297,6 +3311,7 @@ struct device_attribute *megaraid_host_attrs[] = {
        &dev_attr_ldio_outstanding,
        &dev_attr_fw_cmds_outstanding,
        &dev_attr_dump_system_regs,
+       &dev_attr_raid_map_id,
        NULL,
 };