v4.19.13 snapshot.
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
new file mode 100644
index 0000000..7b5df8f
--- /dev/null
+++ b/drivers/misc/mei/debugfs.c
@@ -0,0 +1,288 @@
+/*
+ *
+ * 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/mei.h>
+
+#include "mei_dev.h"
+#include "client.h"
+#include "hw.h"
+
+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 *me_cl;
+ size_t bufsz = 1;
+ char *buf;
+ int i = 0;
+ int pos = 0;
+ int ret;
+
+#define HDR \
+" |id|fix| UUID |con|msg len|sb|refc|\n"
+
+ down_read(&dev->me_clients_rwsem);
+ list_for_each_entry(me_cl, &dev->me_clients, list)
+ bufsz++;
+
+ bufsz *= sizeof(HDR) + 1;
+ buf = kzalloc(bufsz, GFP_KERNEL);
+ if (!buf) {
+ up_read(&dev->me_clients_rwsem);
+ return -ENOMEM;
+ }
+
+ pos += scnprintf(buf + pos, bufsz - pos, HDR);
+#undef HDR
+
+ /* if the driver is not enabled the list won't be consistent */
+ if (dev->dev_state != MEI_DEV_ENABLED)
+ goto out;
+
+ list_for_each_entry(me_cl, &dev->me_clients, list) {
+
+ if (mei_me_cl_get(me_cl)) {
+ pos += scnprintf(buf + pos, bufsz - pos,
+ "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n",
+ i++, me_cl->client_id,
+ me_cl->props.fixed_address,
+ &me_cl->props.protocol_name,
+ me_cl->props.max_number_of_connections,
+ me_cl->props.max_msg_length,
+ me_cl->props.single_recv_buf,
+ kref_read(&me_cl->refcnt));
+
+ mei_me_cl_put(me_cl);
+ }
+ }
+
+out:
+ up_read(&dev->me_clients_rwsem);
+ ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+ kfree(buf);
+ return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_meclients = {
+ .open = simple_open,
+ .read = mei_dbgfs_read_meclients,
+ .llseek = generic_file_llseek,
+};
+
+static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ struct mei_device *dev = fp->private_data;
+ struct mei_cl *cl;
+ size_t bufsz = 1;
+ char *buf;
+ int i = 0;
+ int pos = 0;
+ int ret;
+
+#define HDR " |me|host|state|rd|wr|wrq\n"
+
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ /*
+ * if the driver is not enabled the list won't be consistent,
+ * we output empty table
+ */
+ if (dev->dev_state == MEI_DEV_ENABLED)
+ list_for_each_entry(cl, &dev->file_list, link)
+ bufsz++;
+
+ bufsz *= sizeof(HDR) + 1;
+
+ buf = kzalloc(bufsz, GFP_KERNEL);
+ if (!buf) {
+ mutex_unlock(&dev->device_lock);
+ return -ENOMEM;
+ }
+
+ pos += scnprintf(buf + pos, bufsz - pos, HDR);
+#undef HDR
+
+ /* if the driver is not enabled the list won't be consistent */
+ if (dev->dev_state != MEI_DEV_ENABLED)
+ goto out;
+
+ list_for_each_entry(cl, &dev->file_list, link) {
+
+ pos += scnprintf(buf + pos, bufsz - pos,
+ "%3d|%2d|%4d|%5d|%2d|%2d|%3u\n",
+ i, mei_cl_me_id(cl), cl->host_client_id, cl->state,
+ !list_empty(&cl->rd_completed), cl->writing_state,
+ cl->tx_cb_queued);
+ i++;
+ }
+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_active = {
+ .open = simple_open,
+ .read = mei_dbgfs_read_active,
+ .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, "dev: %s\n",
+ mei_dev_state_str(dev->dev_state));
+ pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n",
+ mei_hbm_state_str(dev->hbm_state));
+
+ if (dev->hbm_state >= MEI_HBM_ENUM_CLIENTS &&
+ dev->hbm_state <= MEI_HBM_STARTED) {
+ pos += scnprintf(buf + pos, bufsz - pos, "hbm features:\n");
+ pos += scnprintf(buf + pos, bufsz - pos, "\tPG: %01d\n",
+ dev->hbm_f_pg_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tDC: %01d\n",
+ dev->hbm_f_dc_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tIE: %01d\n",
+ dev->hbm_f_ie_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n",
+ dev->hbm_f_dot_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n",
+ dev->hbm_f_ev_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tFA: %01d\n",
+ dev->hbm_f_fa_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tOS: %01d\n",
+ dev->hbm_f_os_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tDR: %01d\n",
+ dev->hbm_f_dr_supported);
+ }
+
+ pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n",
+ mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
+ mei_pg_state_str(mei_pg_state(dev)));
+ ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+ kfree(buf);
+ return ret;
+}
+static const struct file_operations mei_dbgfs_fops_devstate = {
+ .open = simple_open,
+ .read = mei_dbgfs_read_devstate,
+ .llseek = generic_file_llseek,
+};
+
+static ssize_t mei_dbgfs_write_allow_fa(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct mei_device *dev;
+ int ret;
+
+ dev = container_of(file->private_data,
+ struct mei_device, allow_fixed_address);
+
+ ret = debugfs_write_file_bool(file, user_buf, count, ppos);
+ if (ret < 0)
+ return ret;
+ dev->override_fixed_address = true;
+ return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_allow_fa = {
+ .open = simple_open,
+ .read = debugfs_read_file_bool,
+ .write = mei_dbgfs_write_allow_fa,
+ .llseek = generic_file_llseek,
+};
+
+/**
+ * mei_dbgfs_deregister - Remove the debugfs files and directories
+ *
+ * @dev: the mei device structure
+ */
+void mei_dbgfs_deregister(struct mei_device *dev)
+{
+ if (!dev->dbgfs_dir)
+ return;
+ debugfs_remove_recursive(dev->dbgfs_dir);
+ dev->dbgfs_dir = NULL;
+}
+
+/**
+ * mei_dbgfs_register - Add the debugfs files
+ *
+ * @dev: the mei device structure
+ * @name: the mei device name
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+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;
+
+ dev->dbgfs_dir = dir;
+
+ f = debugfs_create_file("meclients", S_IRUSR, dir,
+ dev, &mei_dbgfs_fops_meclients);
+ if (!f) {
+ dev_err(dev->dev, "meclients: registration failed\n");
+ goto err;
+ }
+ f = debugfs_create_file("active", S_IRUSR, dir,
+ dev, &mei_dbgfs_fops_active);
+ if (!f) {
+ dev_err(dev->dev, "active: registration failed\n");
+ goto err;
+ }
+ f = debugfs_create_file("devstate", S_IRUSR, dir,
+ dev, &mei_dbgfs_fops_devstate);
+ if (!f) {
+ dev_err(dev->dev, "devstate: registration failed\n");
+ goto err;
+ }
+ f = debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir,
+ &dev->allow_fixed_address,
+ &mei_dbgfs_fops_allow_fa);
+ if (!f) {
+ dev_err(dev->dev, "allow_fixed_address: registration failed\n");
+ goto err;
+ }
+ return 0;
+err:
+ mei_dbgfs_deregister(dev);
+ return -ENODEV;
+}
+