mei: add debugfs hooks
debugfs exposes device state and list of me clients and their
properties
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
new file mode 100644
index 0000000..7135a718
--- /dev/null
+++ b/drivers/misc/mei/debugfs.c
@@ -0,0 +1,149 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2012-2013, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/pci.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hw.h"
+
+static int mei_dbgfs_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ struct mei_device *dev = fp->private_data;
+ struct mei_me_client *cl;
+ const size_t bufsz = 1024;
+ char *buf = kzalloc(bufsz, GFP_KERNEL);
+ int i;
+ int pos = 0;
+ int ret;
+
+ if (!buf)
+ return -ENOMEM;
+
+ pos += scnprintf(buf + pos, bufsz - pos,
+ " |id|addr| UUID |con|msg len|\n");
+
+ mutex_lock(&dev->device_lock);
+
+ /* if the driver is not enabled the list won't b consitent */
+ if (dev->dev_state != MEI_DEV_ENABLED)
+ goto out;
+
+ for (i = 0; i < dev->me_clients_num; i++) {
+ cl = &dev->me_clients[i];
+
+ /* skip me clients that cannot be connected */
+ if (cl->props.max_number_of_connections == 0)
+ continue;
+
+ pos += scnprintf(buf + pos, bufsz - pos,
+ "%2d|%2d|%4d|%pUl|%3d|%7d|\n",
+ i, cl->client_id,
+ cl->props.fixed_address,
+ &cl->props.protocol_name,
+ cl->props.max_number_of_connections,
+ cl->props.max_msg_length);
+ }
+out:
+ mutex_unlock(&dev->device_lock);
+ ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+ kfree(buf);
+ return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_meclients = {
+ .open = mei_dbgfs_open,
+ .read = mei_dbgfs_read_meclients,
+ .llseek = generic_file_llseek,
+};
+
+static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ struct mei_device *dev = fp->private_data;
+ const size_t bufsz = 1024;
+ char *buf = kzalloc(bufsz, GFP_KERNEL);
+ int pos = 0;
+ int ret;
+
+ if (!buf)
+ return -ENOMEM;
+
+ pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
+ mei_dev_state_str(dev->dev_state));
+ ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+ kfree(buf);
+ return ret;
+}
+static const struct file_operations mei_dbgfs_fops_devstate = {
+ .open = mei_dbgfs_open,
+ .read = mei_dbgfs_read_devstate,
+ .llseek = generic_file_llseek,
+};
+
+/**
+ * mei_dbgfs_deregister - Remove the debugfs files and directories
+ * @mei - pointer to mei device private dat
+ */
+void mei_dbgfs_deregister(struct mei_device *dev)
+{
+ if (!dev->dbgfs_dir)
+ return;
+ debugfs_remove_recursive(dev->dbgfs_dir);
+ dev->dbgfs_dir = NULL;
+}
+
+/**
+ * Add the debugfs files
+ *
+ */
+int mei_dbgfs_register(struct mei_device *dev, const char *name)
+{
+ struct dentry *dir, *f;
+ dir = debugfs_create_dir(name, NULL);
+ if (!dir)
+ return -ENOMEM;
+
+ f = debugfs_create_file("meclients", S_IRUSR, dir,
+ dev, &mei_dbgfs_fops_meclients);
+ if (!f) {
+ dev_err(&dev->pdev->dev, "meclients: registration failed\n");
+ goto err;
+ }
+ f = debugfs_create_file("devstate", S_IRUSR, dir,
+ dev, &mei_dbgfs_fops_devstate);
+ if (!f) {
+ dev_err(&dev->pdev->dev, "devstate: registration failed\n");
+ goto err;
+ }
+ dev->dbgfs_dir = dir;
+ return 0;
+err:
+ mei_dbgfs_deregister(dev);
+ return -ENODEV;
+}
+