[SCSI] scsi: Added support for adapter and firmware reset

Added new sysfs attr 'host_reset' in scsi_sysfs.c to
perform adapter or firmware reset as suggested by
Mike Christie here:
http://marc.info/?l=linux-scsi&m=127359347111167&w=2

user/application can write "adapter" or "firmware" on
this attr and it will call newly added function hook
in scsi_host_template to call LDD adapter or firmware
reset implementation.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/scsi_sysfs.c

@@ -246,6 +246,43 @@ show_shost_active_mode(struct device *dev,
 
 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 
+static int check_reset_type(char *str)
+{
+ if (strncmp(str, "adapter", 10) == 0)
+ return SCSI_ADAPTER_RESET;
+ else if (strncmp(str, "firmware", 10) == 0)
+ return SCSI_FIRMWARE_RESET;
+ else
+ return 0;
+}
+
+static ssize_t
+store_host_reset(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct scsi_host_template *sht = shost->hostt;
+ int ret = -EINVAL;
+ char str[10];
+ int type;
+
+ sscanf(buf, "%s", str);
+ type = check_reset_type(str);
+
+ if (!type)
+ goto exit_store_host_reset;
+
+ if (sht->host_reset)
+ ret = sht->host_reset(shost, type);
+
+exit_store_host_reset:
+ if (ret == 0)
+ ret = count;
+ return ret;
+}
+
+static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
+
 shost_rd_attr(unique_id, "%u\n");
 shost_rd_attr(host_busy, "%hu\n");
 shost_rd_attr(cmd_per_lun, "%hd\n");
@@ -272,6 +309,7 @@ static struct attribute *scsi_sysfs_shost_attrs[] = {
  &dev_attr_active_mode.attr,
  &dev_attr_prot_capabilities.attr,
  &dev_attr_prot_guard_type.attr,
+ &dev_attr_host_reset.attr,
  NULL
 };
 

include/scsi/scsi_host.h

@@ -355,6 +355,19 @@ struct scsi_host_template {
  */
  enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
 
+ /* This is an optional routine that allows transport to initiate
+ * LLD adapter or firmware reset using sysfs attribute.
+ *
+ * Return values: 0 on success, -ve value on failure.
+ *
+ * Status: OPTIONAL
+ */
+
+ int (*host_reset)(struct Scsi_Host *shost, int reset_type);
+#define SCSI_ADAPTER_RESET 1
+#define SCSI_FIRMWARE_RESET 2
+
+
  /*
  * Name of proc directory
  */