drivers/net/wireless/iwlwifi/mvm/debugfs.c - kernel/msm-4.19 - Gitiles

 /******************************************************************************
  *
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
  *
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  * USA
  *
  * The full GNU General Public License is included in this distribution
  * in the file called LICENSE.GPL.
  *
  * Contact Information:
  *  Intel Linux Wireless <ilw@linux.intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  * BSD LICENSE
  *
  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *  * Neither the name Intel Corporation nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  *****************************************************************************/
 #include "mvm.h"
 #include "sta.h"
 #include "iwl-io.h"

 struct iwl_dbgfs_mvm_ctx {
 	struct iwl_mvm *mvm;
 	struct ieee80211_vif *vif;
 };

 static int iwl_dbgfs_open_file_generic(struct inode *inode, struct file *file)
 {
 	file->private_data = inode->i_private;
 	return 0;
 }

 static ssize_t iwl_dbgfs_tx_flush_write(struct file *file,
 					const char __user *user_buf,
 					size_t count, loff_t *ppos)
 {
 	struct iwl_mvm *mvm = file->private_data;

 	char buf[16];
 	int buf_size, ret;
 	u32 scd_q_msk;

 	if (!mvm->ucode_loaded || mvm->cur_ucode != IWL_UCODE_REGULAR)
 		return -EIO;

 	memset(buf, 0, sizeof(buf));
 	buf_size = min(count, sizeof(buf) - 1);
 	if (copy_from_user(buf, user_buf, buf_size))
 		return -EFAULT;

 	if (sscanf(buf, "%x", &scd_q_msk) != 1)
 		return -EINVAL;

 	IWL_ERR(mvm, "FLUSHING queues: scd_q_msk = 0x%x\n", scd_q_msk);

 	mutex_lock(&mvm->mutex);
 	ret =  iwl_mvm_flush_tx_path(mvm, scd_q_msk, true) ? : count;
 	mutex_unlock(&mvm->mutex);

 	return ret;
 }

 static ssize_t iwl_dbgfs_sta_drain_write(struct file *file,
 					 const char __user *user_buf,
 					 size_t count, loff_t *ppos)
 {
 	struct iwl_mvm *mvm = file->private_data;
 	struct ieee80211_sta *sta;

 	char buf[8];
 	int buf_size, sta_id, drain, ret;

 	if (!mvm->ucode_loaded || mvm->cur_ucode != IWL_UCODE_REGULAR)
 		return -EIO;

 	memset(buf, 0, sizeof(buf));
 	buf_size = min(count, sizeof(buf) - 1);
 	if (copy_from_user(buf, user_buf, buf_size))
 		return -EFAULT;

 	if (sscanf(buf, "%d %d", &sta_id, &drain) != 2)
 		return -EINVAL;

 	mutex_lock(&mvm->mutex);

 	sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
 					lockdep_is_held(&mvm->mutex));
 	if (IS_ERR_OR_NULL(sta))
 		ret = -ENOENT;
 	else
 		ret = iwl_mvm_drain_sta(mvm, (void *)sta->drv_priv, drain) ? :
 			count;

 	mutex_unlock(&mvm->mutex);

 	return ret;
 }

 static ssize_t iwl_dbgfs_sram_read(struct file *file, char __user *user_buf,
 				   size_t count, loff_t *ppos)
 {
 	struct iwl_mvm *mvm = file->private_data;
 	const struct fw_img *img;
 	int ofs, len, pos = 0;
 	size_t bufsz, ret;
 	char *buf;
 	u8 *ptr;

 	/* default is to dump the entire data segment */
 	if (!mvm->dbgfs_sram_offset && !mvm->dbgfs_sram_len) {
 		mvm->dbgfs_sram_offset = 0x800000;
 		if (!mvm->ucode_loaded)
 			return -EINVAL;
 		img = &mvm->fw->img[mvm->cur_ucode];
 		mvm->dbgfs_sram_len = img->sec[IWL_UCODE_SECTION_DATA].len;
 	}
 	len = mvm->dbgfs_sram_len;

 	bufsz = len * 4 + 256;
 	buf = kzalloc(bufsz, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

 	ptr = kzalloc(len, GFP_KERNEL);
 	if (!ptr) {
 		kfree(buf);
 		return -ENOMEM;
 	}

 	pos += scnprintf(buf + pos, bufsz - pos, "sram_len: 0x%x\n", len);
 	pos += scnprintf(buf + pos, bufsz - pos, "sram_offset: 0x%x\n",
 			 mvm->dbgfs_sram_offset);

 	iwl_trans_read_mem_bytes(mvm->trans,
 				 mvm->dbgfs_sram_offset,
 				 ptr, len);
 	for (ofs = 0; ofs < len; ofs += 16) {
 		pos += scnprintf(buf + pos, bufsz - pos, "0x%.4x ", ofs);
 		hex_dump_to_buffer(ptr + ofs, 16, 16, 1, buf + pos,
 				   bufsz - pos, false);
 		pos += strlen(buf + pos);
 		if (bufsz - pos > 0)
 			buf[pos++] = '\n';
 	}

 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);

 	kfree(buf);
 	kfree(ptr);

 	return ret;
 }

 static ssize_t iwl_dbgfs_sram_write(struct file *file,
 				    const char __user *user_buf, size_t count,
 				    loff_t *ppos)
 {
 	struct iwl_mvm *mvm = file->private_data;
 	char buf[64];
 	int buf_size;
 	u32 offset, len;

 	memset(buf, 0, sizeof(buf));
 	buf_size = min(count, sizeof(buf) -  1);
 	if (copy_from_user(buf, user_buf, buf_size))
 		return -EFAULT;

 	if (sscanf(buf, "%x,%x", &offset, &len) == 2) {
 		if ((offset & 0x3) || (len & 0x3))
 			return -EINVAL;
 		mvm->dbgfs_sram_offset = offset;
 		mvm->dbgfs_sram_len = len;
 	} else {
 		mvm->dbgfs_sram_offset = 0;
 		mvm->dbgfs_sram_len = 0;
 	}

 	return count;
 }

 static ssize_t iwl_dbgfs_stations_read(struct file *file, char __user *user_buf,
 				       size_t count, loff_t *ppos)
 {
 	struct iwl_mvm *mvm = file->private_data;
 	struct ieee80211_sta *sta;
 	char buf[400];
 	int i, pos = 0, bufsz = sizeof(buf);

 	mutex_lock(&mvm->mutex);

 	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 		pos += scnprintf(buf + pos, bufsz - pos, "%.2d: ", i);
 		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 						lockdep_is_held(&mvm->mutex));
 		if (!sta)
 			pos += scnprintf(buf + pos, bufsz - pos, "N/A\n");
 		else if (IS_ERR(sta))
 			pos += scnprintf(buf + pos, bufsz - pos, "%ld\n",
 					 PTR_ERR(sta));
 		else
 			pos += scnprintf(buf + pos, bufsz - pos, "%pM\n",
 					 sta->addr);
 	}

 	mutex_unlock(&mvm->mutex);

 	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 }

 static ssize_t iwl_dbgfs_power_down_allow_write(struct file *file,
 						const char __user *user_buf,
 						size_t count, loff_t *ppos)
 {
 	struct iwl_mvm *mvm = file->private_data;
 	char buf[8] = {};
 	int allow;

 	if (!mvm->ucode_loaded)
 		return -EIO;

 	if (copy_from_user(buf, user_buf, sizeof(buf)))
 		return -EFAULT;

 	if (sscanf(buf, "%d", &allow) != 1)
 		return -EINVAL;

 	IWL_DEBUG_POWER(mvm, "%s device power down\n",
 			allow ? "allow" : "prevent");

 	/*
 	 * TODO: Send REPLY_DEBUG_CMD (0xf0) when FW support it
 	 */

 	return count;
 }

 static ssize_t iwl_dbgfs_power_down_d3_allow_write(struct file *file,
 						   const char __user *user_buf,
 						   size_t count, loff_t *ppos)
 {
 	struct iwl_mvm *mvm = file->private_data;
 	char buf[8] = {};
 	int allow;

 	if (copy_from_user(buf, user_buf, sizeof(buf)))
 		return -EFAULT;

 	if (sscanf(buf, "%d", &allow) != 1)
 		return -EINVAL;

 	IWL_DEBUG_POWER(mvm, "%s device power down in d3\n",
 			allow ? "allow" : "prevent");

 	/*
 	 * TODO: When WoWLAN FW alive notification happens, driver will send
 	 * REPLY_DEBUG_CMD setting power_down_allow flag according to
 	 * mvm->prevent_power_down_d3
 	 */
 	mvm->prevent_power_down_d3 = !allow;

 	return count;
 }

 #define MVM_DEBUGFS_READ_FILE_OPS(name)					\
 static const struct file_operations iwl_dbgfs_##name##_ops = {	\
 	.read = iwl_dbgfs_##name##_read,				\
 	.open = iwl_dbgfs_open_file_generic,				\
 	.llseek = generic_file_llseek,					\
 }

 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name)				\
 static const struct file_operations iwl_dbgfs_##name##_ops = {	\
 	.write = iwl_dbgfs_##name##_write,				\
 	.read = iwl_dbgfs_##name##_read,				\
 	.open = iwl_dbgfs_open_file_generic,				\
 	.llseek = generic_file_llseek,					\
 };

 #define MVM_DEBUGFS_WRITE_FILE_OPS(name)				\
 static const struct file_operations iwl_dbgfs_##name##_ops = {	\
 	.write = iwl_dbgfs_##name##_write,				\
 	.open = iwl_dbgfs_open_file_generic,				\
 	.llseek = generic_file_llseek,					\
 };

 #define MVM_DEBUGFS_ADD_FILE(name, parent, mode) do {			\
 		if (!debugfs_create_file(#name, mode, parent, mvm,	\
 					 &iwl_dbgfs_##name##_ops))	\
 			goto err;					\
 	} while (0)

 #define MVM_DEBUGFS_ADD_FILE_VIF(name, parent, mode) do {		\
 		if (!debugfs_create_file(#name, mode, parent, vif,	\
 					 &iwl_dbgfs_##name##_ops))	\
 			goto err;					\
 	} while (0)

 /* Device wide debugfs entries */
 MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush);
 MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(sram);
 MVM_DEBUGFS_READ_FILE_OPS(stations);
 MVM_DEBUGFS_WRITE_FILE_OPS(power_down_allow);
 MVM_DEBUGFS_WRITE_FILE_OPS(power_down_d3_allow);

 int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
 {
 	char buf[100];

 	mvm->debugfs_dir = dbgfs_dir;

 	MVM_DEBUGFS_ADD_FILE(tx_flush, mvm->debugfs_dir, S_IWUSR);
 	MVM_DEBUGFS_ADD_FILE(sta_drain, mvm->debugfs_dir, S_IWUSR);
 	MVM_DEBUGFS_ADD_FILE(sram, mvm->debugfs_dir, S_IWUSR | S_IRUSR);
 	MVM_DEBUGFS_ADD_FILE(stations, dbgfs_dir, S_IRUSR);
 	MVM_DEBUGFS_ADD_FILE(power_down_allow, mvm->debugfs_dir, S_IWUSR);
 	MVM_DEBUGFS_ADD_FILE(power_down_d3_allow, mvm->debugfs_dir, S_IWUSR);

 	/*
 	 * Create a symlink with mac80211. It will be removed when mac80211
 	 * exists (before the opmode exists which removes the target.)
 	 */
 	snprintf(buf, 100, "../../%s/%s",
 		 dbgfs_dir->d_parent->d_parent->d_name.name,
 		 dbgfs_dir->d_parent->d_name.name);
 	if (!debugfs_create_symlink("iwlwifi", mvm->hw->wiphy->debugfsdir, buf))
 		goto err;

 	return 0;
 err:
 	IWL_ERR(mvm, "Can't create the mvm debugfs directory\n");
 	return -ENOMEM;
 }
	/******************************************************************************
	*
	* This file is provided under a dual BSD/GPLv2 license. When using or
	* redistributing this file, you may do so under either license.
	*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
	* USA
	*
	* The full GNU General Public License is included in this distribution
	* in the file called LICENSE.GPL.
	*
	* Contact Information:
	* Intel Linux Wireless <ilw@linux.intel.com>
	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	*
	* BSD LICENSE
	*
	* Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*****************************************************************************/
	#include "mvm.h"
	#include "sta.h"
	#include "iwl-io.h"

	struct iwl_dbgfs_mvm_ctx {
	struct iwl_mvm *mvm;
	struct ieee80211_vif *vif;
	};

	static int iwl_dbgfs_open_file_generic(struct inode inode, struct file file)
	{
	file->private_data = inode->i_private;
	return 0;
	}

	static ssize_t iwl_dbgfs_tx_flush_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct iwl_mvm *mvm = file->private_data;

	char buf[16];
	int buf_size, ret;
	u32 scd_q_msk;

	if (!mvm->ucode_loaded \|\| mvm->cur_ucode != IWL_UCODE_REGULAR)
	return -EIO;

	memset(buf, 0, sizeof(buf));
	buf_size = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, buf_size))
	return -EFAULT;

	if (sscanf(buf, "%x", &scd_q_msk) != 1)
	return -EINVAL;

	IWL_ERR(mvm, "FLUSHING queues: scd_q_msk = 0x%x\n", scd_q_msk);

	mutex_lock(&mvm->mutex);
	ret = iwl_mvm_flush_tx_path(mvm, scd_q_msk, true) ? : count;
	mutex_unlock(&mvm->mutex);

	return ret;
	}

	static ssize_t iwl_dbgfs_sta_drain_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct iwl_mvm *mvm = file->private_data;
	struct ieee80211_sta *sta;

	char buf[8];
	int buf_size, sta_id, drain, ret;

	if (!mvm->ucode_loaded \|\| mvm->cur_ucode != IWL_UCODE_REGULAR)
	return -EIO;

	memset(buf, 0, sizeof(buf));
	buf_size = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, buf_size))
	return -EFAULT;

	if (sscanf(buf, "%d %d", &sta_id, &drain) != 2)
	return -EINVAL;

	mutex_lock(&mvm->mutex);

	sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
	lockdep_is_held(&mvm->mutex));
	if (IS_ERR_OR_NULL(sta))
	ret = -ENOENT;
	else
	ret = iwl_mvm_drain_sta(mvm, (void *)sta->drv_priv, drain) ? :
	count;

	mutex_unlock(&mvm->mutex);

	return ret;
	}

	static ssize_t iwl_dbgfs_sram_read(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct iwl_mvm *mvm = file->private_data;
	const struct fw_img *img;
	int ofs, len, pos = 0;
	size_t bufsz, ret;
	char *buf;
	u8 *ptr;

	/* default is to dump the entire data segment */
	if (!mvm->dbgfs_sram_offset && !mvm->dbgfs_sram_len) {
	mvm->dbgfs_sram_offset = 0x800000;
	if (!mvm->ucode_loaded)
	return -EINVAL;
	img = &mvm->fw->img[mvm->cur_ucode];
	mvm->dbgfs_sram_len = img->sec[IWL_UCODE_SECTION_DATA].len;
	}
	len = mvm->dbgfs_sram_len;

	bufsz = len * 4 + 256;
	buf = kzalloc(bufsz, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	ptr = kzalloc(len, GFP_KERNEL);
	if (!ptr) {
	kfree(buf);
	return -ENOMEM;
	}

	pos += scnprintf(buf + pos, bufsz - pos, "sram_len: 0x%x\n", len);
	pos += scnprintf(buf + pos, bufsz - pos, "sram_offset: 0x%x\n",
	mvm->dbgfs_sram_offset);

	iwl_trans_read_mem_bytes(mvm->trans,
	mvm->dbgfs_sram_offset,
	ptr, len);
	for (ofs = 0; ofs < len; ofs += 16) {
	pos += scnprintf(buf + pos, bufsz - pos, "0x%.4x ", ofs);
	hex_dump_to_buffer(ptr + ofs, 16, 16, 1, buf + pos,
	bufsz - pos, false);
	pos += strlen(buf + pos);
	if (bufsz - pos > 0)
	buf[pos++] = '\n';
	}

	ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);

	kfree(buf);
	kfree(ptr);

	return ret;
	}

	static ssize_t iwl_dbgfs_sram_write(struct file *file,
	const char __user *user_buf, size_t count,
	loff_t *ppos)
	{
	struct iwl_mvm *mvm = file->private_data;
	char buf[64];
	int buf_size;
	u32 offset, len;

	memset(buf, 0, sizeof(buf));
	buf_size = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, buf_size))
	return -EFAULT;

	if (sscanf(buf, "%x,%x", &offset, &len) == 2) {
	if ((offset & 0x3) \|\| (len & 0x3))
	return -EINVAL;
	mvm->dbgfs_sram_offset = offset;
	mvm->dbgfs_sram_len = len;
	} else {
	mvm->dbgfs_sram_offset = 0;
	mvm->dbgfs_sram_len = 0;
	}

	return count;
	}

	static ssize_t iwl_dbgfs_stations_read(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct iwl_mvm *mvm = file->private_data;
	struct ieee80211_sta *sta;
	char buf[400];
	int i, pos = 0, bufsz = sizeof(buf);

	mutex_lock(&mvm->mutex);

	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
	pos += scnprintf(buf + pos, bufsz - pos, "%.2d: ", i);
	sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
	lockdep_is_held(&mvm->mutex));
	if (!sta)
	pos += scnprintf(buf + pos, bufsz - pos, "N/A\n");
	else if (IS_ERR(sta))
	pos += scnprintf(buf + pos, bufsz - pos, "%ld\n",
	PTR_ERR(sta));
	else
	pos += scnprintf(buf + pos, bufsz - pos, "%pM\n",
	sta->addr);
	}

	mutex_unlock(&mvm->mutex);

	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
	}

	static ssize_t iwl_dbgfs_power_down_allow_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct iwl_mvm *mvm = file->private_data;
	char buf[8] = {};
	int allow;

	if (!mvm->ucode_loaded)
	return -EIO;

	if (copy_from_user(buf, user_buf, sizeof(buf)))
	return -EFAULT;

	if (sscanf(buf, "%d", &allow) != 1)
	return -EINVAL;

	IWL_DEBUG_POWER(mvm, "%s device power down\n",
	allow ? "allow" : "prevent");

	/*
	* TODO: Send REPLY_DEBUG_CMD (0xf0) when FW support it
	*/

	return count;
	}

	static ssize_t iwl_dbgfs_power_down_d3_allow_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct iwl_mvm *mvm = file->private_data;
	char buf[8] = {};
	int allow;

	if (copy_from_user(buf, user_buf, sizeof(buf)))
	return -EFAULT;

	if (sscanf(buf, "%d", &allow) != 1)
	return -EINVAL;

	IWL_DEBUG_POWER(mvm, "%s device power down in d3\n",
	allow ? "allow" : "prevent");

	/*
	* TODO: When WoWLAN FW alive notification happens, driver will send
	* REPLY_DEBUG_CMD setting power_down_allow flag according to
	* mvm->prevent_power_down_d3
	*/
	mvm->prevent_power_down_d3 = !allow;

	return count;
	}

	#define MVM_DEBUGFS_READ_FILE_OPS(name) \
	static const struct file_operations iwl_dbgfs_##name##_ops = { \
	.read = iwl_dbgfs_##name##_read, \
	.open = iwl_dbgfs_open_file_generic, \
	.llseek = generic_file_llseek, \
	}

	#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name) \
	static const struct file_operations iwl_dbgfs_##name##_ops = { \
	.write = iwl_dbgfs_##name##_write, \
	.read = iwl_dbgfs_##name##_read, \
	.open = iwl_dbgfs_open_file_generic, \
	.llseek = generic_file_llseek, \
	};

	#define MVM_DEBUGFS_WRITE_FILE_OPS(name) \
	static const struct file_operations iwl_dbgfs_##name##_ops = { \
	.write = iwl_dbgfs_##name##_write, \
	.open = iwl_dbgfs_open_file_generic, \
	.llseek = generic_file_llseek, \
	};

	#define MVM_DEBUGFS_ADD_FILE(name, parent, mode) do { \
	if (!debugfs_create_file(#name, mode, parent, mvm, \
	&iwl_dbgfs_##name##_ops)) \
	goto err; \
	} while (0)

	#define MVM_DEBUGFS_ADD_FILE_VIF(name, parent, mode) do { \
	if (!debugfs_create_file(#name, mode, parent, vif, \
	&iwl_dbgfs_##name##_ops)) \
	goto err; \
	} while (0)

	/* Device wide debugfs entries */
	MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush);
	MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain);
	MVM_DEBUGFS_READ_WRITE_FILE_OPS(sram);
	MVM_DEBUGFS_READ_FILE_OPS(stations);
	MVM_DEBUGFS_WRITE_FILE_OPS(power_down_allow);
	MVM_DEBUGFS_WRITE_FILE_OPS(power_down_d3_allow);

	int iwl_mvm_dbgfs_register(struct iwl_mvm mvm, struct dentry dbgfs_dir)
	{
	char buf[100];

	mvm->debugfs_dir = dbgfs_dir;

	MVM_DEBUGFS_ADD_FILE(tx_flush, mvm->debugfs_dir, S_IWUSR);
	MVM_DEBUGFS_ADD_FILE(sta_drain, mvm->debugfs_dir, S_IWUSR);
	MVM_DEBUGFS_ADD_FILE(sram, mvm->debugfs_dir, S_IWUSR \| S_IRUSR);
	MVM_DEBUGFS_ADD_FILE(stations, dbgfs_dir, S_IRUSR);
	MVM_DEBUGFS_ADD_FILE(power_down_allow, mvm->debugfs_dir, S_IWUSR);
	MVM_DEBUGFS_ADD_FILE(power_down_d3_allow, mvm->debugfs_dir, S_IWUSR);

	/*
	* Create a symlink with mac80211. It will be removed when mac80211
	* exists (before the opmode exists which removes the target.)
	*/
	snprintf(buf, 100, "../../%s/%s",
	dbgfs_dir->d_parent->d_parent->d_name.name,
	dbgfs_dir->d_parent->d_name.name);
	if (!debugfs_create_symlink("iwlwifi", mvm->hw->wiphy->debugfsdir, buf))
	goto err;

	return 0;
	err:
	IWL_ERR(mvm, "Can't create the mvm debugfs directory\n");
	return -ENOMEM;
	}