[SCSI] add supported_mode and active_mode attributes to the host
This adds supported_mode and active_mode attributes to
/sys/class/sys_host/hostX/ for specifying the mode that a lld supports
and the currently activated mode. The output format is similar to fc
rport roles:
luce:/sys/class/scsi_host/host0$ cat supported_mode
Initiator
luce:/sys/class/scsi_host/host0$ cat active_mode
Initiator
The mode values uses bitmap since we would support dual-mode llds in
the future like this:
luce:/sys/class/scsi_host/host0$ cat supported_mode
Initiator, Target
The supported_mode attribute looks at a scsi_host_template and the
active_mode attribute looks at a scsi_host. We would add a hook to a
scsi_host_template to change the active_mode attribute
dynamically. But now there is no hook since no lld supports that
feature.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 34cdce6..a3d227f 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -190,6 +190,46 @@
static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
+static ssize_t
+show_shost_mode(unsigned int mode, char *buf)
+{
+ ssize_t len = 0;
+
+ if (mode & MODE_INITIATOR)
+ len = sprintf(buf, "%s", "Initiator");
+
+ if (mode & MODE_TARGET)
+ len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
+
+ len += sprintf(buf + len, "\n");
+
+ return len;
+}
+
+static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(class_dev);
+
+ if (shost->hostt->supported_mode == MODE_UNKNOWN)
+ return snprintf(buf, 20, "unknown\n");
+ else
+ return show_shost_mode(shost->hostt->supported_mode, buf);
+}
+
+static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
+
+static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(class_dev);
+
+ if (shost->active_mode == MODE_UNKNOWN)
+ return snprintf(buf, 20, "unknown\n");
+ else
+ return show_shost_mode(shost->active_mode, buf);
+}
+
+static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
+
shost_rd_attr(unique_id, "%u\n");
shost_rd_attr(host_busy, "%hu\n");
shost_rd_attr(cmd_per_lun, "%hd\n");
@@ -208,6 +248,8 @@
&class_device_attr_proc_name,
&class_device_attr_scan,
&class_device_attr_state,
+ &class_device_attr_supported_mode,
+ &class_device_attr_active_mode,
NULL
};
