drivers/scsi/bfa/bfad_debugfs.c - kernel/msm-5.4 - Gitiles

 /*
  * Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
  * Copyright (c) 2014- QLogic Corporation.
  * All rights reserved
  * www.qlogic.com
  *
  * Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License (GPL) Version 2 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.
  */

 #include <linux/debugfs.h>
 #include <linux/export.h>

 #include "bfad_drv.h"
 #include "bfad_im.h"

 /*
  * BFA debufs interface
  *
  * To access the interface, debugfs file system should be mounted
  * if not already mounted using:
  * mount -t debugfs none /sys/kernel/debug
  *
  * BFA Hierarchy:
  *	- bfa/pci_dev:<pci_name>
  * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa
  *
  * Debugging service available per pci_dev:
  * fwtrc:  To collect current firmware trace.
  * drvtrc: To collect current driver trace
  * fwsave: To collect last saved fw trace as a result of firmware crash.
  * regwr:  To write one word to chip register
  * regrd:  To read one or more words from chip register.
  */

 struct bfad_debug_info {
 	char *debug_buffer;
 	void *i_private;
 	int buffer_len;
 };

 static int
 bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file)
 {
 	struct bfad_port_s *port = inode->i_private;
 	struct bfad_s *bfad = port->bfad;
 	struct bfad_debug_info *debug;

 	debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
 	if (!debug)
 		return -ENOMEM;

 	debug->debug_buffer = (void *) bfad->trcmod;
 	debug->buffer_len = sizeof(struct bfa_trc_mod_s);

 	file->private_data = debug;

 	return 0;
 }

 static int
 bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file)
 {
 	struct bfad_port_s *port = inode->i_private;
 	struct bfad_s *bfad = port->bfad;
 	struct bfad_debug_info *fw_debug;
 	unsigned long flags;
 	int rc;

 	fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
 	if (!fw_debug)
 		return -ENOMEM;

 	fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);

 	fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
 	if (!fw_debug->debug_buffer) {
 		kfree(fw_debug);
 		printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n",
 				bfad->inst_no);
 		return -ENOMEM;
 	}

 	spin_lock_irqsave(&bfad->bfad_lock, flags);
 	rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc,
 			fw_debug->debug_buffer,
 			&fw_debug->buffer_len);
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 	if (rc != BFA_STATUS_OK) {
 		vfree(fw_debug->debug_buffer);
 		fw_debug->debug_buffer = NULL;
 		kfree(fw_debug);
 		printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n",
 				bfad->inst_no);
 		return -ENOMEM;
 	}

 	file->private_data = fw_debug;

 	return 0;
 }

 static int
 bfad_debugfs_open_fwsave(struct inode *inode, struct file *file)
 {
 	struct bfad_port_s *port = inode->i_private;
 	struct bfad_s *bfad = port->bfad;
 	struct bfad_debug_info *fw_debug;
 	unsigned long flags;
 	int rc;

 	fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
 	if (!fw_debug)
 		return -ENOMEM;

 	fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);

 	fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
 	if (!fw_debug->debug_buffer) {
 		kfree(fw_debug);
 		printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n",
 				bfad->inst_no);
 		return -ENOMEM;
 	}

 	spin_lock_irqsave(&bfad->bfad_lock, flags);
 	rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc,
 			fw_debug->debug_buffer,
 			&fw_debug->buffer_len);
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 	if (rc != BFA_STATUS_OK) {
 		vfree(fw_debug->debug_buffer);
 		fw_debug->debug_buffer = NULL;
 		kfree(fw_debug);
 		printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n",
 				bfad->inst_no);
 		return -ENOMEM;
 	}

 	file->private_data = fw_debug;

 	return 0;
 }

 static int
 bfad_debugfs_open_reg(struct inode *inode, struct file *file)
 {
 	struct bfad_debug_info *reg_debug;

 	reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
 	if (!reg_debug)
 		return -ENOMEM;

 	reg_debug->i_private = inode->i_private;

 	file->private_data = reg_debug;

 	return 0;
 }

 /* Changes the current file position */
 static loff_t
 bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
 {
 	struct bfad_debug_info *debug = file->private_data;
 	return fixed_size_llseek(file, offset, orig,
 				debug->buffer_len);
 }

 static ssize_t
 bfad_debugfs_read(struct file *file, char __user *buf,
 			size_t nbytes, loff_t *pos)
 {
 	struct bfad_debug_info *debug = file->private_data;

 	if (!debug || !debug->debug_buffer)
 		return 0;

 	return simple_read_from_buffer(buf, nbytes, pos,
 				debug->debug_buffer, debug->buffer_len);
 }

 #define BFA_REG_CT_ADDRSZ	(0x40000)
 #define BFA_REG_CB_ADDRSZ	(0x20000)
 #define BFA_REG_ADDRSZ(__ioc)	\
 	((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ?	\
 	 BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
 #define BFA_REG_ADDRMSK(__ioc)	(BFA_REG_ADDRSZ(__ioc) - 1)

 static bfa_status_t
 bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
 {
 	u8	area;

 	/* check [16:15] */
 	area = (offset >> 15) & 0x7;
 	if (area == 0) {
 		/* PCIe core register */
 		if ((offset + (len<<2)) > 0x8000)    /* 8k dwords or 32KB */
 			return BFA_STATUS_EINVAL;
 	} else if (area == 0x1) {
 		/* CB 32 KB memory page */
 		if ((offset + (len<<2)) > 0x10000)    /* 8k dwords or 32KB */
 			return BFA_STATUS_EINVAL;
 	} else {
 		/* CB register space 64KB */
 		if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
 			return BFA_STATUS_EINVAL;
 	}
 	return BFA_STATUS_OK;
 }

 static ssize_t
 bfad_debugfs_read_regrd(struct file *file, char __user *buf,
 		size_t nbytes, loff_t *pos)
 {
 	struct bfad_debug_info *regrd_debug = file->private_data;
 	struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
 	struct bfad_s *bfad = port->bfad;
 	ssize_t rc;

 	if (!bfad->regdata)
 		return 0;

 	rc = simple_read_from_buffer(buf, nbytes, pos,
 			bfad->regdata, bfad->reglen);

 	if ((*pos + nbytes) >= bfad->reglen) {
 		kfree(bfad->regdata);
 		bfad->regdata = NULL;
 		bfad->reglen = 0;
 	}

 	return rc;
 }

 static ssize_t
 bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
 		size_t nbytes, loff_t *ppos)
 {
 	struct bfad_debug_info *regrd_debug = file->private_data;
 	struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
 	struct bfad_s *bfad = port->bfad;
 	struct bfa_s *bfa = &bfad->bfa;
 	struct bfa_ioc_s *ioc = &bfa->ioc;
 	int addr, rc, i;
 	u32 len;
 	u32 *regbuf;
 	void __iomem *rb, *reg_addr;
 	unsigned long flags;
 	void *kern_buf;

 	kern_buf = memdup_user(buf, nbytes);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);

 	rc = sscanf(kern_buf, "%x:%x", &addr, &len);
 	if (rc < 2 || len > (UINT_MAX >> 2)) {
 		printk(KERN_INFO
 			"bfad[%d]: %s failed to read user buf\n",
 			bfad->inst_no, __func__);
 		kfree(kern_buf);
 		return -EINVAL;
 	}

 	kfree(kern_buf);
 	kfree(bfad->regdata);
 	bfad->regdata = NULL;
 	bfad->reglen = 0;

 	bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
 	if (!bfad->regdata) {
 		printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
 				bfad->inst_no);
 		return -ENOMEM;
 	}

 	bfad->reglen = len << 2;
 	rb = bfa_ioc_bar0(ioc);
 	addr &= BFA_REG_ADDRMSK(ioc);

 	/* offset and len sanity check */
 	rc = bfad_reg_offset_check(bfa, addr, len);
 	if (rc) {
 		printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
 				bfad->inst_no);
 		kfree(bfad->regdata);
 		bfad->regdata = NULL;
 		bfad->reglen = 0;
 		return -EINVAL;
 	}

 	reg_addr = rb + addr;
 	regbuf =  (u32 *)bfad->regdata;
 	spin_lock_irqsave(&bfad->bfad_lock, flags);
 	for (i = 0; i < len; i++) {
 		*regbuf = readl(reg_addr);
 		regbuf++;
 		reg_addr += sizeof(u32);
 	}
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);

 	return nbytes;
 }

 static ssize_t
 bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
 		size_t nbytes, loff_t *ppos)
 {
 	struct bfad_debug_info *debug = file->private_data;
 	struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
 	struct bfad_s *bfad = port->bfad;
 	struct bfa_s *bfa = &bfad->bfa;
 	struct bfa_ioc_s *ioc = &bfa->ioc;
 	int addr, val, rc;
 	void __iomem *reg_addr;
 	unsigned long flags;
 	void *kern_buf;

 	kern_buf = memdup_user(buf, nbytes);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);

 	rc = sscanf(kern_buf, "%x:%x", &addr, &val);
 	if (rc < 2) {
 		printk(KERN_INFO
 			"bfad[%d]: %s failed to read user buf\n",
 			bfad->inst_no, __func__);
 		kfree(kern_buf);
 		return -EINVAL;
 	}
 	kfree(kern_buf);

 	addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */

 	/* offset and len sanity check */
 	rc = bfad_reg_offset_check(bfa, addr, 1);
 	if (rc) {
 		printk(KERN_INFO
 			"bfad[%d]: Failed reg offset check\n",
 			bfad->inst_no);
 		return -EINVAL;
 	}

 	reg_addr = (bfa_ioc_bar0(ioc)) + addr;
 	spin_lock_irqsave(&bfad->bfad_lock, flags);
 	writel(val, reg_addr);
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);

 	return nbytes;
 }

 static int
 bfad_debugfs_release(struct inode *inode, struct file *file)
 {
 	struct bfad_debug_info *debug = file->private_data;

 	if (!debug)
 		return 0;

 	file->private_data = NULL;
 	kfree(debug);
 	return 0;
 }

 static int
 bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
 {
 	struct bfad_debug_info *fw_debug = file->private_data;

 	if (!fw_debug)
 		return 0;

 	if (fw_debug->debug_buffer)
 		vfree(fw_debug->debug_buffer);

 	file->private_data = NULL;
 	kfree(fw_debug);
 	return 0;
 }

 static const struct file_operations bfad_debugfs_op_drvtrc = {
 	.owner		=	THIS_MODULE,
 	.open		=	bfad_debugfs_open_drvtrc,
 	.llseek		=	bfad_debugfs_lseek,
 	.read		=	bfad_debugfs_read,
 	.release	=	bfad_debugfs_release,
 };

 static const struct file_operations bfad_debugfs_op_fwtrc = {
 	.owner		=	THIS_MODULE,
 	.open		=	bfad_debugfs_open_fwtrc,
 	.llseek		=	bfad_debugfs_lseek,
 	.read		=	bfad_debugfs_read,
 	.release	=	bfad_debugfs_release_fwtrc,
 };

 static const struct file_operations bfad_debugfs_op_fwsave = {
 	.owner		=	THIS_MODULE,
 	.open		=	bfad_debugfs_open_fwsave,
 	.llseek		=	bfad_debugfs_lseek,
 	.read		=	bfad_debugfs_read,
 	.release	=	bfad_debugfs_release_fwtrc,
 };

 static const struct file_operations bfad_debugfs_op_regrd = {
 	.owner		=	THIS_MODULE,
 	.open		=	bfad_debugfs_open_reg,
 	.llseek		=	bfad_debugfs_lseek,
 	.read		=	bfad_debugfs_read_regrd,
 	.write		=	bfad_debugfs_write_regrd,
 	.release	=	bfad_debugfs_release,
 };

 static const struct file_operations bfad_debugfs_op_regwr = {
 	.owner		=	THIS_MODULE,
 	.open		=	bfad_debugfs_open_reg,
 	.llseek		=	bfad_debugfs_lseek,
 	.write		=	bfad_debugfs_write_regwr,
 	.release	=	bfad_debugfs_release,
 };

 struct bfad_debugfs_entry {
 	const char *name;
 	umode_t	mode;
 	const struct file_operations *fops;
 };

 static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
 	{ "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
 	{ "fwtrc",  S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc,  },
 	{ "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
 	{ "regrd",  S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd,  },
 	{ "regwr",  S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr,  },
 };

 static struct dentry *bfa_debugfs_root;
 static atomic_t bfa_debugfs_port_count;

 inline void
 bfad_debugfs_init(struct bfad_port_s *port)
 {
 	struct bfad_s *bfad = port->bfad;
 	const struct bfad_debugfs_entry *file;
 	char name[64];
 	int i;

 	if (!bfa_debugfs_enable)
 		return;

 	/* Setup the BFA debugfs root directory*/
 	if (!bfa_debugfs_root) {
 		bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
 		atomic_set(&bfa_debugfs_port_count, 0);
 	}

 	/* Setup the pci_dev debugfs directory for the port */
 	snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
 	if (!port->port_debugfs_root) {
 		port->port_debugfs_root =
 			debugfs_create_dir(name, bfa_debugfs_root);

 		atomic_inc(&bfa_debugfs_port_count);

 		for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 			file = &bfad_debugfs_files[i];
 			bfad->bfad_dentry_files[i] =
 					debugfs_create_file(file->name,
 							file->mode,
 							port->port_debugfs_root,
 							port,
 							file->fops);
 		}
 	}

 	return;
 }

 inline void
 bfad_debugfs_exit(struct bfad_port_s *port)
 {
 	struct bfad_s *bfad = port->bfad;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 		if (bfad->bfad_dentry_files[i]) {
 			debugfs_remove(bfad->bfad_dentry_files[i]);
 			bfad->bfad_dentry_files[i] = NULL;
 		}
 	}

 	/* Remove the pci_dev debugfs directory for the port */
 	if (port->port_debugfs_root) {
 		debugfs_remove(port->port_debugfs_root);
 		port->port_debugfs_root = NULL;
 		atomic_dec(&bfa_debugfs_port_count);
 	}

 	/* Remove the BFA debugfs root directory */
 	if (atomic_read(&bfa_debugfs_port_count) == 0) {
 		debugfs_remove(bfa_debugfs_root);
 		bfa_debugfs_root = NULL;
 	}
 }
	/*
	* Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
	* Copyright (c) 2014- QLogic Corporation.
	* All rights reserved
	* www.qlogic.com
	*
	* Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License (GPL) Version 2 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.
	*/

	#include <linux/debugfs.h>
	#include <linux/export.h>

	#include "bfad_drv.h"
	#include "bfad_im.h"

	/*
	* BFA debufs interface
	*
	* To access the interface, debugfs file system should be mounted
	* if not already mounted using:
	* mount -t debugfs none /sys/kernel/debug
	*
	* BFA Hierarchy:
	* - bfa/pci_dev:<pci_name>
	* where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa
	*
	* Debugging service available per pci_dev:
	* fwtrc: To collect current firmware trace.
	* drvtrc: To collect current driver trace
	* fwsave: To collect last saved fw trace as a result of firmware crash.
	* regwr: To write one word to chip register
	* regrd: To read one or more words from chip register.
	*/

	struct bfad_debug_info {
	char *debug_buffer;
	void *i_private;
	int buffer_len;
	};

	static int
	bfad_debugfs_open_drvtrc(struct inode inode, struct file file)
	{
	struct bfad_port_s *port = inode->i_private;
	struct bfad_s *bfad = port->bfad;
	struct bfad_debug_info *debug;

	debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
	if (!debug)
	return -ENOMEM;

	debug->debug_buffer = (void *) bfad->trcmod;
	debug->buffer_len = sizeof(struct bfa_trc_mod_s);

	file->private_data = debug;

	return 0;
	}

	static int
	bfad_debugfs_open_fwtrc(struct inode inode, struct file file)
	{
	struct bfad_port_s *port = inode->i_private;
	struct bfad_s *bfad = port->bfad;
	struct bfad_debug_info *fw_debug;
	unsigned long flags;
	int rc;

	fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
	if (!fw_debug)
	return -ENOMEM;

	fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);

	fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
	if (!fw_debug->debug_buffer) {
	kfree(fw_debug);
	printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n",
	bfad->inst_no);
	return -ENOMEM;
	}

	spin_lock_irqsave(&bfad->bfad_lock, flags);
	rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc,
	fw_debug->debug_buffer,
	&fw_debug->buffer_len);
	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
	if (rc != BFA_STATUS_OK) {
	vfree(fw_debug->debug_buffer);
	fw_debug->debug_buffer = NULL;
	kfree(fw_debug);
	printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n",
	bfad->inst_no);
	return -ENOMEM;
	}

	file->private_data = fw_debug;

	return 0;
	}

	static int
	bfad_debugfs_open_fwsave(struct inode inode, struct file file)
	{
	struct bfad_port_s *port = inode->i_private;
	struct bfad_s *bfad = port->bfad;
	struct bfad_debug_info *fw_debug;
	unsigned long flags;
	int rc;

	fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
	if (!fw_debug)
	return -ENOMEM;

	fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);

	fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
	if (!fw_debug->debug_buffer) {
	kfree(fw_debug);
	printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n",
	bfad->inst_no);
	return -ENOMEM;
	}

	spin_lock_irqsave(&bfad->bfad_lock, flags);
	rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc,
	fw_debug->debug_buffer,
	&fw_debug->buffer_len);
	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
	if (rc != BFA_STATUS_OK) {
	vfree(fw_debug->debug_buffer);
	fw_debug->debug_buffer = NULL;
	kfree(fw_debug);
	printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n",
	bfad->inst_no);
	return -ENOMEM;
	}

	file->private_data = fw_debug;

	return 0;
	}

	static int
	bfad_debugfs_open_reg(struct inode inode, struct file file)
	{
	struct bfad_debug_info *reg_debug;

	reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
	if (!reg_debug)
	return -ENOMEM;

	reg_debug->i_private = inode->i_private;

	file->private_data = reg_debug;

	return 0;
	}

	/* Changes the current file position */
	static loff_t
	bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
	{
	struct bfad_debug_info *debug = file->private_data;
	return fixed_size_llseek(file, offset, orig,
	debug->buffer_len);
	}

	static ssize_t
	bfad_debugfs_read(struct file file, char __user buf,
	size_t nbytes, loff_t *pos)
	{
	struct bfad_debug_info *debug = file->private_data;

	if (!debug \|\| !debug->debug_buffer)
	return 0;

	return simple_read_from_buffer(buf, nbytes, pos,
	debug->debug_buffer, debug->buffer_len);
	}

	#define BFA_REG_CT_ADDRSZ (0x40000)
	#define BFA_REG_CB_ADDRSZ (0x20000)
	#define BFA_REG_ADDRSZ(__ioc) \
	((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ? \
	BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
	#define BFA_REG_ADDRMSK(__ioc) (BFA_REG_ADDRSZ(__ioc) - 1)

	static bfa_status_t
	bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
	{
	u8 area;

	/* check [16:15] */
	area = (offset >> 15) & 0x7;
	if (area == 0) {
	/* PCIe core register */
	if ((offset + (len<<2)) > 0x8000) /* 8k dwords or 32KB */
	return BFA_STATUS_EINVAL;
	} else if (area == 0x1) {
	/* CB 32 KB memory page */
	if ((offset + (len<<2)) > 0x10000) /* 8k dwords or 32KB */
	return BFA_STATUS_EINVAL;
	} else {
	/* CB register space 64KB */
	if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
	return BFA_STATUS_EINVAL;
	}
	return BFA_STATUS_OK;
	}

	static ssize_t
	bfad_debugfs_read_regrd(struct file file, char __user buf,
	size_t nbytes, loff_t *pos)
	{
	struct bfad_debug_info *regrd_debug = file->private_data;
	struct bfad_port_s port = (struct bfad_port_s )regrd_debug->i_private;
	struct bfad_s *bfad = port->bfad;
	ssize_t rc;

	if (!bfad->regdata)
	return 0;

	rc = simple_read_from_buffer(buf, nbytes, pos,
	bfad->regdata, bfad->reglen);

	if ((*pos + nbytes) >= bfad->reglen) {
	kfree(bfad->regdata);
	bfad->regdata = NULL;
	bfad->reglen = 0;
	}

	return rc;
	}

	static ssize_t
	bfad_debugfs_write_regrd(struct file file, const char __user buf,
	size_t nbytes, loff_t *ppos)
	{
	struct bfad_debug_info *regrd_debug = file->private_data;
	struct bfad_port_s port = (struct bfad_port_s )regrd_debug->i_private;
	struct bfad_s *bfad = port->bfad;
	struct bfa_s *bfa = &bfad->bfa;
	struct bfa_ioc_s *ioc = &bfa->ioc;
	int addr, rc, i;
	u32 len;
	u32 *regbuf;
	void __iomem rb, reg_addr;
	unsigned long flags;
	void *kern_buf;

	kern_buf = memdup_user(buf, nbytes);
	if (IS_ERR(kern_buf))
	return PTR_ERR(kern_buf);

	rc = sscanf(kern_buf, "%x:%x", &addr, &len);
	if (rc < 2 \|\| len > (UINT_MAX >> 2)) {
	printk(KERN_INFO
	"bfad[%d]: %s failed to read user buf\n",
	bfad->inst_no, __func__);
	kfree(kern_buf);
	return -EINVAL;
	}

	kfree(kern_buf);
	kfree(bfad->regdata);
	bfad->regdata = NULL;
	bfad->reglen = 0;

	bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
	if (!bfad->regdata) {
	printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
	bfad->inst_no);
	return -ENOMEM;
	}

	bfad->reglen = len << 2;
	rb = bfa_ioc_bar0(ioc);
	addr &= BFA_REG_ADDRMSK(ioc);

	/* offset and len sanity check */
	rc = bfad_reg_offset_check(bfa, addr, len);
	if (rc) {
	printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
	bfad->inst_no);
	kfree(bfad->regdata);
	bfad->regdata = NULL;
	bfad->reglen = 0;
	return -EINVAL;
	}

	reg_addr = rb + addr;
	regbuf = (u32 *)bfad->regdata;
	spin_lock_irqsave(&bfad->bfad_lock, flags);
	for (i = 0; i < len; i++) {
	*regbuf = readl(reg_addr);
	regbuf++;
	reg_addr += sizeof(u32);
	}
	spin_unlock_irqrestore(&bfad->bfad_lock, flags);

	return nbytes;
	}

	static ssize_t
	bfad_debugfs_write_regwr(struct file file, const char __user buf,
	size_t nbytes, loff_t *ppos)
	{
	struct bfad_debug_info *debug = file->private_data;
	struct bfad_port_s port = (struct bfad_port_s )debug->i_private;
	struct bfad_s *bfad = port->bfad;
	struct bfa_s *bfa = &bfad->bfa;
	struct bfa_ioc_s *ioc = &bfa->ioc;
	int addr, val, rc;
	void __iomem *reg_addr;
	unsigned long flags;
	void *kern_buf;

	kern_buf = memdup_user(buf, nbytes);
	if (IS_ERR(kern_buf))
	return PTR_ERR(kern_buf);

	rc = sscanf(kern_buf, "%x:%x", &addr, &val);
	if (rc < 2) {
	printk(KERN_INFO
	"bfad[%d]: %s failed to read user buf\n",
	bfad->inst_no, __func__);
	kfree(kern_buf);
	return -EINVAL;
	}
	kfree(kern_buf);

	addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */

	/* offset and len sanity check */
	rc = bfad_reg_offset_check(bfa, addr, 1);
	if (rc) {
	printk(KERN_INFO
	"bfad[%d]: Failed reg offset check\n",
	bfad->inst_no);
	return -EINVAL;
	}

	reg_addr = (bfa_ioc_bar0(ioc)) + addr;
	spin_lock_irqsave(&bfad->bfad_lock, flags);
	writel(val, reg_addr);
	spin_unlock_irqrestore(&bfad->bfad_lock, flags);

	return nbytes;
	}

	static int
	bfad_debugfs_release(struct inode inode, struct file file)
	{
	struct bfad_debug_info *debug = file->private_data;

	if (!debug)
	return 0;

	file->private_data = NULL;
	kfree(debug);
	return 0;
	}

	static int
	bfad_debugfs_release_fwtrc(struct inode inode, struct file file)
	{
	struct bfad_debug_info *fw_debug = file->private_data;

	if (!fw_debug)
	return 0;

	if (fw_debug->debug_buffer)
	vfree(fw_debug->debug_buffer);

	file->private_data = NULL;
	kfree(fw_debug);
	return 0;
	}

	static const struct file_operations bfad_debugfs_op_drvtrc = {
	.owner = THIS_MODULE,
	.open = bfad_debugfs_open_drvtrc,
	.llseek = bfad_debugfs_lseek,
	.read = bfad_debugfs_read,
	.release = bfad_debugfs_release,
	};

	static const struct file_operations bfad_debugfs_op_fwtrc = {
	.owner = THIS_MODULE,
	.open = bfad_debugfs_open_fwtrc,
	.llseek = bfad_debugfs_lseek,
	.read = bfad_debugfs_read,
	.release = bfad_debugfs_release_fwtrc,
	};

	static const struct file_operations bfad_debugfs_op_fwsave = {
	.owner = THIS_MODULE,
	.open = bfad_debugfs_open_fwsave,
	.llseek = bfad_debugfs_lseek,
	.read = bfad_debugfs_read,
	.release = bfad_debugfs_release_fwtrc,
	};

	static const struct file_operations bfad_debugfs_op_regrd = {
	.owner = THIS_MODULE,
	.open = bfad_debugfs_open_reg,
	.llseek = bfad_debugfs_lseek,
	.read = bfad_debugfs_read_regrd,
	.write = bfad_debugfs_write_regrd,
	.release = bfad_debugfs_release,
	};

	static const struct file_operations bfad_debugfs_op_regwr = {
	.owner = THIS_MODULE,
	.open = bfad_debugfs_open_reg,
	.llseek = bfad_debugfs_lseek,
	.write = bfad_debugfs_write_regwr,
	.release = bfad_debugfs_release,
	};

	struct bfad_debugfs_entry {
	const char *name;
	umode_t mode;
	const struct file_operations *fops;
	};

	static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
	{ "drvtrc", S_IFREG\|S_IRUGO, &bfad_debugfs_op_drvtrc, },
	{ "fwtrc", S_IFREG\|S_IRUGO, &bfad_debugfs_op_fwtrc, },
	{ "fwsave", S_IFREG\|S_IRUGO, &bfad_debugfs_op_fwsave, },
	{ "regrd", S_IFREG\|S_IRUGO\|S_IWUSR, &bfad_debugfs_op_regrd, },
	{ "regwr", S_IFREG\|S_IWUSR, &bfad_debugfs_op_regwr, },
	};

	static struct dentry *bfa_debugfs_root;
	static atomic_t bfa_debugfs_port_count;

	inline void
	bfad_debugfs_init(struct bfad_port_s *port)
	{
	struct bfad_s *bfad = port->bfad;
	const struct bfad_debugfs_entry *file;
	char name[64];
	int i;

	if (!bfa_debugfs_enable)
	return;

	/* Setup the BFA debugfs root directory*/
	if (!bfa_debugfs_root) {
	bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
	atomic_set(&bfa_debugfs_port_count, 0);
	}

	/* Setup the pci_dev debugfs directory for the port */
	snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
	if (!port->port_debugfs_root) {
	port->port_debugfs_root =
	debugfs_create_dir(name, bfa_debugfs_root);

	atomic_inc(&bfa_debugfs_port_count);

	for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
	file = &bfad_debugfs_files[i];
	bfad->bfad_dentry_files[i] =
	debugfs_create_file(file->name,
	file->mode,
	port->port_debugfs_root,
	port,
	file->fops);
	}
	}

	return;
	}

	inline void
	bfad_debugfs_exit(struct bfad_port_s *port)
	{
	struct bfad_s *bfad = port->bfad;
	int i;

	for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
	if (bfad->bfad_dentry_files[i]) {
	debugfs_remove(bfad->bfad_dentry_files[i]);
	bfad->bfad_dentry_files[i] = NULL;
	}
	}

	/* Remove the pci_dev debugfs directory for the port */
	if (port->port_debugfs_root) {
	debugfs_remove(port->port_debugfs_root);
	port->port_debugfs_root = NULL;
	atomic_dec(&bfa_debugfs_port_count);
	}

	/* Remove the BFA debugfs root directory */
	if (atomic_read(&bfa_debugfs_port_count) == 0) {
	debugfs_remove(bfa_debugfs_root);
	bfa_debugfs_root = NULL;
	}
	}