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

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

drivers/misc/mei/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/misc/mei/debugfs.c

0 → 100644
+149 −0
Original line number Diff line number Diff line 
/*

 *

 * 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;

}

drivers/misc/mei/main.c

+14 −4
Original line number Diff line number Diff line
@@ -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;

}

drivers/misc/mei/mei_dev.h

+18 −2
Original line number Diff line number Diff line
@@ -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)                  \

drivers/misc/mei/pci-me.c

+3 −2
Original line number Diff line number Diff line
@@ -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