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/*
*
* 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 "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|addr| UUID |con|msg len|sb|\n"
mutex_lock(&dev->device_lock);
list_for_each_entry(me_cl, &dev->me_clients, list)
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);
/* 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) {
/* skip me clients that cannot be connected */
if (me_cl->props.max_number_of_connections == 0)
continue;
pos += scnprintf(buf + pos, bufsz - pos,
"%2d|%2d|%4d|%pUl|%3d|%7d|%2d|\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);
}
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 = 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;
const size_t bufsz = 1024;
char *buf;
int i = 0;
int pos = 0;
int ret;
if (!dev)
return -ENODEV;
buf = kzalloc(bufsz, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pos += scnprintf(buf + pos, bufsz - pos,
" |me|host|state|rd|wr|\n");
mutex_lock(&dev->device_lock);
/* 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,
"%2d|%2d|%4d|%5d|%2d|%2d|\n",
i, cl->me_client_id, cl->host_client_id, cl->state,
cl->reading_state, cl->writing_state);
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));
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,
};
/**
* 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;
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, "meclients: 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;
}
dev->dbgfs_dir = dir;
return 0;
err:
mei_dbgfs_deregister(dev);
return -ENODEV;
}
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