fnic_debugfs.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0-only
// Copyright 2012 Cisco Systems, Inc.  All rights reserved.

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/debugfs.h>
#include <linux/vmalloc.h>
#include "fnic.h"

static struct dentry *fnic_trace_debugfs_root;
static struct dentry *fnic_trace_debugfs_file;
static struct dentry *fnic_trace_enable;
static struct dentry *fnic_stats_debugfs_root;

static struct dentry *fnic_fc_trace_debugfs_file;
static struct dentry *fnic_fc_rdata_trace_debugfs_file;
static struct dentry *fnic_fc_trace_enable;
static struct dentry *fnic_fc_trace_clear;

struct fc_trace_flag_type { … };

static struct fc_trace_flag_type *fc_trc_flag;

/*
 * fnic_debugfs_init - Initialize debugfs for fnic debug logging
 *
 * Description:
 * When Debugfs is configured this routine sets up the fnic debugfs
 * file system. If not already created, this routine will create the
 * fnic directory and statistics directory for trace buffer and
 * stats logging.
 */
int fnic_debugfs_init(void)
{ … }

/*
 * fnic_debugfs_terminate - Tear down debugfs infrastructure
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic.
 */
void fnic_debugfs_terminate(void)
{ … }

/*
 * fnic_trace_ctrl_read -
 *          Read  trace_enable ,fc_trace_enable
 *              or fc_trace_clear debugfs file
 * @filp: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @cnt: The number of bytes to read.
 * @ppos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads value of variable fnic_tracing_enabled or
 * fnic_fc_tracing_enabled or fnic_fc_trace_cleared
 * and stores into local @buf.
 * It will start reading file at @ppos and
 * copy up to @cnt of data to @ubuf from @buf.
 *
 * Returns:
 * This function returns the amount of data that was read.
 */
static ssize_t fnic_trace_ctrl_read(struct file *filp,
				  char __user *ubuf,
				  size_t cnt, loff_t *ppos)
{ … }

/*
 * fnic_trace_ctrl_write -
 * Write to trace_enable, fc_trace_enable or
 *         fc_trace_clear debugfs file
 * @filp: The file pointer to write from.
 * @ubuf: The buffer to copy the data from.
 * @cnt: The number of bytes to write.
 * @ppos: The position in the file to start writing to.
 *
 * Description:
 * This routine writes data from user buffer @ubuf to buffer @buf and
 * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared
 * value as per user input.
 *
 * Returns:
 * This function returns the amount of data that was written.
 */
static ssize_t fnic_trace_ctrl_write(struct file *filp,
				  const char __user *ubuf,
				  size_t cnt, loff_t *ppos)
{ … }

static const struct file_operations fnic_trace_ctrl_fops = …;

/*
 * fnic_trace_debugfs_open - Open the fnic trace log
 * @inode: The inode pointer
 * @file: The file pointer to attach the log output
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation.
 * It allocates the necessary buffer for the log, fills the buffer from
 * the in-memory log and then returns a pointer to that log in
 * the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return
 * a negative error value.
 */
static int fnic_trace_debugfs_open(struct inode *inode,
				  struct file *file)
{ … }

/*
 * fnic_trace_debugfs_lseek - Seek through a debugfs file
 * @file: The file pointer to seek through.
 * @offset: The offset to seek to or the amount to seek by.
 * @howto: Indicates how to seek.
 *
 * Description:
 * This routine is the entry point for the debugfs lseek file operation.
 * The @howto parameter indicates whether @offset is the offset to directly
 * seek to, or if it is a value to seek forward or reverse by. This function
 * figures out what the new offset of the debugfs file will be and assigns
 * that value to the f_pos field of @file.
 *
 * Returns:
 * This function returns the new offset if successful and returns a negative
 * error if unable to process the seek.
 */
static loff_t fnic_trace_debugfs_lseek(struct file *file,
					loff_t offset,
					int howto)
{ … }

/*
 * fnic_trace_debugfs_read - Read a debugfs file
 * @file: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @nbytes: The number of bytes to read.
 * @pos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads data from the buffer indicated in the private_data
 * field of @file. It will start reading at @pos and copy up to @nbytes of
 * data to @ubuf.
 *
 * Returns:
 * This function returns the amount of data that was read (this could be
 * less than @nbytes if the end of the file was reached).
 */
static ssize_t fnic_trace_debugfs_read(struct file *file,
					char __user *ubuf,
					size_t nbytes,
					loff_t *pos)
{ … }

/*
 * fnic_trace_debugfs_release - Release the buffer used to store
 * debugfs file data
 * @inode: The inode pointer
 * @file: The file pointer that contains the buffer to release
 *
 * Description:
 * This routine frees the buffer that was allocated when the debugfs
 * file was opened.
 *
 * Returns:
 * This function returns zero.
 */
static int fnic_trace_debugfs_release(struct inode *inode,
					  struct file *file)
{ … }

static const struct file_operations fnic_trace_debugfs_fops = …;

/*
 * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging
 *
 * Description:
 * When Debugfs is configured this routine sets up the fnic debugfs
 * file system. If not already created, this routine will create the
 * create file trace to log fnic trace buffer output into debugfs and
 * it will also create file trace_enable to control enable/disable of
 * trace logging into trace buffer.
 */
void fnic_trace_debugfs_init(void)
{ … }

/*
 * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic trace logging.
 */
void fnic_trace_debugfs_terminate(void)
{ … }

/*
 * fnic_fc_trace_debugfs_init -
 * Initialize debugfs for fnic control frame trace logging
 *
 * Description:
 * When Debugfs is configured this routine sets up the fnic_fc debugfs
 * file system. If not already created, this routine will create the
 * create file trace to log fnic fc trace buffer output into debugfs and
 * it will also create file fc_trace_enable to control enable/disable of
 * trace logging into trace buffer.
 */

void fnic_fc_trace_debugfs_init(void)
{ … }

/*
 * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic_fc trace logging.
 */

void fnic_fc_trace_debugfs_terminate(void)
{ … }

/*
 * fnic_reset_stats_open - Open the reset_stats file
 * @inode: The inode pointer.
 * @file: The file pointer to attach the stats reset flag.
 *
 * Description:
 * This routine opens a debugsfs file reset_stats and stores i_private data
 * to debug structure to retrieve later for while performing other
 * file oprations.
 *
 * Returns:
 * This function returns zero if successful.
 */
static int fnic_reset_stats_open(struct inode *inode, struct file *file)
{ … }

/*
 * fnic_reset_stats_read - Read a reset_stats debugfs file
 * @filp: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @cnt: The number of bytes to read.
 * @ppos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads value of variable reset_stats
 * and stores into local @buf. It will start reading file at @ppos and
 * copy up to @cnt of data to @ubuf from @buf.
 *
 * Returns:
 * This function returns the amount of data that was read.
 */
static ssize_t fnic_reset_stats_read(struct file *file,
					char __user *ubuf,
					size_t cnt, loff_t *ppos)
{ … }

/*
 * fnic_reset_stats_write - Write to reset_stats debugfs file
 * @filp: The file pointer to write from.
 * @ubuf: The buffer to copy the data from.
 * @cnt: The number of bytes to write.
 * @ppos: The position in the file to start writing to.
 *
 * Description:
 * This routine writes data from user buffer @ubuf to buffer @buf and
 * resets cumulative stats of fnic.
 *
 * Returns:
 * This function returns the amount of data that was written.
 */
static ssize_t fnic_reset_stats_write(struct file *file,
					const char __user *ubuf,
					size_t cnt, loff_t *ppos)
{ … }

/*
 * fnic_reset_stats_release - Release the buffer used to store
 * debugfs file data
 * @inode: The inode pointer
 * @file: The file pointer that contains the buffer to release
 *
 * Description:
 * This routine frees the buffer that was allocated when the debugfs
 * file was opened.
 *
 * Returns:
 * This function returns zero.
 */
static int fnic_reset_stats_release(struct inode *inode,
					struct file *file)
{ … }

/*
 * fnic_stats_debugfs_open - Open the stats file for specific host
 * and get fnic stats.
 * @inode: The inode pointer.
 * @file: The file pointer to attach the specific host statistics.
 *
 * Description:
 * This routine opens a debugsfs file stats of specific host and print
 * fnic stats.
 *
 * Returns:
 * This function returns zero if successful.
 */
static int fnic_stats_debugfs_open(struct inode *inode,
					struct file *file)
{ … }

/*
 * fnic_stats_debugfs_read - Read a debugfs file
 * @file: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @nbytes: The number of bytes to read.
 * @pos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads data from the buffer indicated in the private_data
 * field of @file. It will start reading at @pos and copy up to @nbytes of
 * data to @ubuf.
 *
 * Returns:
 * This function returns the amount of data that was read (this could be
 * less than @nbytes if the end of the file was reached).
 */
static ssize_t fnic_stats_debugfs_read(struct file *file,
					char __user *ubuf,
					size_t nbytes,
					loff_t *pos)
{ … }

/*
 * fnic_stats_stats_release - Release the buffer used to store
 * debugfs file data
 * @inode: The inode pointer
 * @file: The file pointer that contains the buffer to release
 *
 * Description:
 * This routine frees the buffer that was allocated when the debugfs
 * file was opened.
 *
 * Returns:
 * This function returns zero.
 */
static int fnic_stats_debugfs_release(struct inode *inode,
					struct file *file)
{ … }

static const struct file_operations fnic_stats_debugfs_fops = …;

static const struct file_operations fnic_reset_debugfs_fops = …;

/*
 * fnic_stats_init - Initialize stats struct and create stats file per fnic
 *
 * Description:
 * When Debugfs is configured this routine sets up the stats file per fnic
 * It will create file stats and reset_stats under statistics/host# directory
 * to log per fnic stats.
 */
void fnic_stats_debugfs_init(struct fnic *fnic)
{ … }

/*
 * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic stats.
 */
void fnic_stats_debugfs_remove(struct fnic *fnic)
{ … }
linux/drivers/scsi/fnic/fnic_debugfs.c
