Commit 30e53bb8 authored by Tomas Winkler's avatar Tomas Winkler Committed by Greg Kroah-Hartman

mei: add debugfs hooks

debugfs exposes device state and list of me clients and their
properties
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a864ec76
......@@ -11,6 +11,7 @@ mei-objs += main.o
mei-objs += amthif.o
mei-objs += wd.o
mei-objs += bus.o
mei-$(CONFIG_DEBUG_FS) += debugfs.o
obj-$(CONFIG_INTEL_MEI_ME) += mei-me.o
mei-me-objs := pci-me.o
......
/*
*
* 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;
}
......@@ -753,15 +753,25 @@ static struct miscdevice mei_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
};
int mei_register(struct device *dev)
int mei_register(struct mei_device *dev)
{
mei_misc_device.parent = dev;
return misc_register(&mei_misc_device);
int ret;
mei_misc_device.parent = &dev->pdev->dev;
ret = misc_register(&mei_misc_device);
if (ret)
return ret;
if (mei_dbgfs_register(dev, mei_misc_device.name))
dev_err(&dev->pdev->dev, "cannot register debugfs\n");
return 0;
}
EXPORT_SYMBOL_GPL(mei_register);
void mei_deregister(void)
void mei_deregister(struct mei_device *dev)
{
mei_dbgfs_deregister(dev);
misc_deregister(&mei_misc_device);
mei_misc_device.parent = NULL;
}
......
......@@ -437,6 +437,11 @@ struct mei_device {
/* List of bus devices */
struct list_head device_list;
#if IS_ENABLED(CONFIG_DEBUG_FS)
struct dentry *dbgfs_dir;
#endif /* CONFIG_DEBUG_FS */
const struct mei_hw_ops *ops;
char hw[0] __aligned(sizeof(void *));
};
......@@ -603,8 +608,19 @@ static inline int mei_count_full_read_slots(struct mei_device *dev)
return dev->ops->rdbuf_full_slots(dev);
}
int mei_register(struct device *dev);
void mei_deregister(void);
#if IS_ENABLED(CONFIG_DEBUG_FS)
int mei_dbgfs_register(struct mei_device *dev, const char *name);
void mei_dbgfs_deregister(struct mei_device *dev);
#else
static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
{
return 0;
}
static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
#endif /* CONFIG_DEBUG_FS */
int mei_register(struct mei_device *dev);
void mei_deregister(struct mei_device *dev);
#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
#define MEI_HDR_PRM(hdr) \
......
......@@ -190,7 +190,7 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto release_irq;
}
err = mei_register(&pdev->dev);
err = mei_register(dev);
if (err)
goto release_irq;
......@@ -262,12 +262,13 @@ static void mei_me_remove(struct pci_dev *pdev)
if (hw->mem_addr)
pci_iounmap(pdev, hw->mem_addr);
mei_deregister(dev);
kfree(dev);
pci_release_regions(pdev);
pci_disable_device(pdev);
mei_deregister();
}
#ifdef CONFIG_PM
......
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