drivers/scsi/qedf/qedf_debugfs.c - arm/linux - Git at Google

 /*
  *  QLogic FCoE Offload Driver
  *  Copyright (c) 2016 QLogic Corporation
  *
  *  This software is available under the terms of the GNU General Public License
  *  (GPL) Version 2, available from the file COPYING in the main directory of
  *  this source tree.
  */
 #ifdef CONFIG_DEBUG_FS

 #include <linux/uaccess.h>
 #include <linux/debugfs.h>
 #include <linux/module.h>

 #include "qedf.h"
 #include "qedf_dbg.h"

 static struct dentry *qedf_dbg_root;

 /**
  * qedf_dbg_host_init - setup the debugfs file for the pf
  * @pf: the pf that is starting up
  **/
 void
 qedf_dbg_host_init(struct qedf_dbg_ctx *qedf,
 		    struct qedf_debugfs_ops *dops,
 		    struct file_operations *fops)
 {
 	char host_dirname[32];
 	struct dentry *file_dentry = NULL;

 	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "Creating debugfs host node\n");
 	/* create pf dir */
 	sprintf(host_dirname, "host%u", qedf->host_no);
 	qedf->bdf_dentry = debugfs_create_dir(host_dirname, qedf_dbg_root);
 	if (!qedf->bdf_dentry)
 		return;

 	/* create debugfs files */
 	while (dops) {
 		if (!(dops->name))
 			break;

 		file_dentry = debugfs_create_file(dops->name, 0600,
 						  qedf->bdf_dentry, qedf,
 						  fops);
 		if (!file_dentry) {
 			QEDF_INFO(qedf, QEDF_LOG_DEBUGFS,
 				   "Debugfs entry %s creation failed\n",
 				   dops->name);
 			debugfs_remove_recursive(qedf->bdf_dentry);
 			return;
 		}
 		dops++;
 		fops++;
 	}
 }

 /**
  * qedf_dbg_host_exit - clear out the pf's debugfs entries
  * @pf: the pf that is stopping
  **/
 void
 qedf_dbg_host_exit(struct qedf_dbg_ctx *qedf)
 {
 	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "Destroying debugfs host "
 		   "entry\n");
 	/* remove debugfs  entries of this PF */
 	debugfs_remove_recursive(qedf->bdf_dentry);
 	qedf->bdf_dentry = NULL;
 }

 /**
  * qedf_dbg_init - start up debugfs for the driver
  **/
 void
 qedf_dbg_init(char *drv_name)
 {
 	QEDF_INFO(NULL, QEDF_LOG_DEBUGFS, "Creating debugfs root node\n");

 	/* create qed dir in root of debugfs. NULL means debugfs root */
 	qedf_dbg_root = debugfs_create_dir(drv_name, NULL);
 	if (!qedf_dbg_root)
 		QEDF_INFO(NULL, QEDF_LOG_DEBUGFS, "Init of debugfs "
 			   "failed\n");
 }

 /**
  * qedf_dbg_exit - clean out the driver's debugfs entries
  **/
 void
 qedf_dbg_exit(void)
 {
 	QEDF_INFO(NULL, QEDF_LOG_DEBUGFS, "Destroying debugfs root "
 		   "entry\n");

 	/* remove qed dir in root of debugfs */
 	debugfs_remove_recursive(qedf_dbg_root);
 	qedf_dbg_root = NULL;
 }

 struct qedf_debugfs_ops qedf_debugfs_ops[] = {
 	{ "fp_int", NULL },
 	{ "io_trace", NULL },
 	{ "debug", NULL },
 	{ "stop_io_on_error", NULL},
 	{ "driver_stats", NULL},
 	{ "clear_stats", NULL},
 	{ "offload_stats", NULL},
 	/* This must be last */
 	{ NULL, NULL }
 };

 DECLARE_PER_CPU(struct qedf_percpu_iothread_s, qedf_percpu_iothreads);

 static ssize_t
 qedf_dbg_fp_int_cmd_read(struct file *filp, char __user *buffer, size_t count,
 			 loff_t *ppos)
 {
 	size_t cnt = 0;
 	int id;
 	struct qedf_fastpath *fp = NULL;
 	struct qedf_dbg_ctx *qedf_dbg =
 				(struct qedf_dbg_ctx *)filp->private_data;
 	struct qedf_ctx *qedf = container_of(qedf_dbg,
 	    struct qedf_ctx, dbg_ctx);

 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");

 	cnt = sprintf(buffer, "\nFastpath I/O completions\n\n");

 	for (id = 0; id < qedf->num_queues; id++) {
 		fp = &(qedf->fp_array[id]);
 		if (fp->sb_id == QEDF_SB_ID_NULL)
 			continue;
 		cnt += sprintf((buffer + cnt), "#%d: %lu\n", id,
 			       fp->completions);
 	}

 	cnt = min_t(int, count, cnt - *ppos);
 	*ppos += cnt;
 	return cnt;
 }

 static ssize_t
 qedf_dbg_fp_int_cmd_write(struct file *filp, const char __user *buffer,
 			  size_t count, loff_t *ppos)
 {
 	if (!count || *ppos)
 		return 0;

 	return count;
 }

 static ssize_t
 qedf_dbg_debug_cmd_read(struct file *filp, char __user *buffer, size_t count,
 			loff_t *ppos)
 {
 	int cnt;
 	struct qedf_dbg_ctx *qedf =
 				(struct qedf_dbg_ctx *)filp->private_data;

 	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "entered\n");
 	cnt = sprintf(buffer, "debug mask = 0x%x\n", qedf_debug);

 	cnt = min_t(int, count, cnt - *ppos);
 	*ppos += cnt;
 	return cnt;
 }

 static ssize_t
 qedf_dbg_debug_cmd_write(struct file *filp, const char __user *buffer,
 			 size_t count, loff_t *ppos)
 {
 	uint32_t val;
 	void *kern_buf;
 	int rval;
 	struct qedf_dbg_ctx *qedf =
 	    (struct qedf_dbg_ctx *)filp->private_data;

 	if (!count || *ppos)
 		return 0;

 	kern_buf = memdup_user(buffer, count);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);

 	rval = kstrtouint(kern_buf, 10, &val);
 	kfree(kern_buf);
 	if (rval)
 		return rval;

 	if (val == 1)
 		qedf_debug = QEDF_DEFAULT_LOG_MASK;
 	else
 		qedf_debug = val;

 	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "Setting debug=0x%x.\n", val);
 	return count;
 }

 static ssize_t
 qedf_dbg_stop_io_on_error_cmd_read(struct file *filp, char __user *buffer,
 				   size_t count, loff_t *ppos)
 {
 	int cnt;
 	struct qedf_dbg_ctx *qedf_dbg =
 				(struct qedf_dbg_ctx *)filp->private_data;
 	struct qedf_ctx *qedf = container_of(qedf_dbg,
 	    struct qedf_ctx, dbg_ctx);

 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");
 	cnt = sprintf(buffer, "%s\n",
 	    qedf->stop_io_on_error ? "true" : "false");

 	cnt = min_t(int, count, cnt - *ppos);
 	*ppos += cnt;
 	return cnt;
 }

 static ssize_t
 qedf_dbg_stop_io_on_error_cmd_write(struct file *filp,
 				    const char __user *buffer, size_t count,
 				    loff_t *ppos)
 {
 	void *kern_buf;
 	struct qedf_dbg_ctx *qedf_dbg =
 				(struct qedf_dbg_ctx *)filp->private_data;
 	struct qedf_ctx *qedf = container_of(qedf_dbg, struct qedf_ctx,
 	    dbg_ctx);

 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");

 	if (!count || *ppos)
 		return 0;

 	kern_buf = memdup_user(buffer, 6);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);

 	if (strncmp(kern_buf, "false", 5) == 0)
 		qedf->stop_io_on_error = false;
 	else if (strncmp(kern_buf, "true", 4) == 0)
 		qedf->stop_io_on_error = true;
 	else if (strncmp(kern_buf, "now", 3) == 0)
 		/* Trigger from user to stop all I/O on this host */
 		set_bit(QEDF_DBG_STOP_IO, &qedf->flags);

 	kfree(kern_buf);
 	return count;
 }

 static int
 qedf_io_trace_show(struct seq_file *s, void *unused)
 {
 	int i, idx = 0;
 	struct qedf_ctx *qedf = s->private;
 	struct qedf_dbg_ctx *qedf_dbg = &qedf->dbg_ctx;
 	struct qedf_io_log *io_log;
 	unsigned long flags;

 	if (!qedf_io_tracing) {
 		seq_puts(s, "I/O tracing not enabled.\n");
 		goto out;
 	}

 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");

 	spin_lock_irqsave(&qedf->io_trace_lock, flags);
 	idx = qedf->io_trace_idx;
 	for (i = 0; i < QEDF_IO_TRACE_SIZE; i++) {
 		io_log = &qedf->io_trace_buf[idx];
 		seq_printf(s, "%d:", io_log->direction);
 		seq_printf(s, "0x%x:", io_log->task_id);
 		seq_printf(s, "0x%06x:", io_log->port_id);
 		seq_printf(s, "%d:", io_log->lun);
 		seq_printf(s, "0x%02x:", io_log->op);
 		seq_printf(s, "0x%02x%02x%02x%02x:", io_log->lba[0],
 		    io_log->lba[1], io_log->lba[2], io_log->lba[3]);
 		seq_printf(s, "%d:", io_log->bufflen);
 		seq_printf(s, "%d:", io_log->sg_count);
 		seq_printf(s, "0x%08x:", io_log->result);
 		seq_printf(s, "%lu:", io_log->jiffies);
 		seq_printf(s, "%d:", io_log->refcount);
 		seq_printf(s, "%d:", io_log->req_cpu);
 		seq_printf(s, "%d:", io_log->int_cpu);
 		seq_printf(s, "%d:", io_log->rsp_cpu);
 		seq_printf(s, "%d\n", io_log->sge_type);

 		idx++;
 		if (idx == QEDF_IO_TRACE_SIZE)
 			idx = 0;
 	}
 	spin_unlock_irqrestore(&qedf->io_trace_lock, flags);

 out:
 	return 0;
 }

 static int
 qedf_dbg_io_trace_open(struct inode *inode, struct file *file)
 {
 	struct qedf_dbg_ctx *qedf_dbg = inode->i_private;
 	struct qedf_ctx *qedf = container_of(qedf_dbg,
 	    struct qedf_ctx, dbg_ctx);

 	return single_open(file, qedf_io_trace_show, qedf);
 }

 static int
 qedf_driver_stats_show(struct seq_file *s, void *unused)
 {
 	struct qedf_ctx *qedf = s->private;
 	struct qedf_rport *fcport;
 	struct fc_rport_priv *rdata;

 	seq_printf(s, "cmg_mgr free io_reqs: %d\n",
 	    atomic_read(&qedf->cmd_mgr->free_list_cnt));
 	seq_printf(s, "slow SGEs: %d\n", qedf->slow_sge_ios);
 	seq_printf(s, "single SGEs: %d\n", qedf->single_sge_ios);
 	seq_printf(s, "fast SGEs: %d\n\n", qedf->fast_sge_ios);

 	seq_puts(s, "Offloaded ports:\n\n");

 	rcu_read_lock();
 	list_for_each_entry_rcu(fcport, &qedf->fcports, peers) {
 		rdata = fcport->rdata;
 		if (rdata == NULL)
 			continue;
 		seq_printf(s, "%06x: free_sqes: %d, num_active_ios: %d\n",
 		    rdata->ids.port_id, atomic_read(&fcport->free_sqes),
 		    atomic_read(&fcport->num_active_ios));
 	}
 	rcu_read_unlock();

 	return 0;
 }

 static int
 qedf_dbg_driver_stats_open(struct inode *inode, struct file *file)
 {
 	struct qedf_dbg_ctx *qedf_dbg = inode->i_private;
 	struct qedf_ctx *qedf = container_of(qedf_dbg,
 	    struct qedf_ctx, dbg_ctx);

 	return single_open(file, qedf_driver_stats_show, qedf);
 }

 static ssize_t
 qedf_dbg_clear_stats_cmd_read(struct file *filp, char __user *buffer,
 				   size_t count, loff_t *ppos)
 {
 	int cnt = 0;

 	/* Essentially a read stub */
 	cnt = min_t(int, count, cnt - *ppos);
 	*ppos += cnt;
 	return cnt;
 }

 static ssize_t
 qedf_dbg_clear_stats_cmd_write(struct file *filp,
 				    const char __user *buffer, size_t count,
 				    loff_t *ppos)
 {
 	struct qedf_dbg_ctx *qedf_dbg =
 				(struct qedf_dbg_ctx *)filp->private_data;
 	struct qedf_ctx *qedf = container_of(qedf_dbg, struct qedf_ctx,
 	    dbg_ctx);

 	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "Clearing stat counters.\n");

 	if (!count || *ppos)
 		return 0;

 	/* Clear stat counters exposed by 'stats' node */
 	qedf->slow_sge_ios = 0;
 	qedf->single_sge_ios = 0;
 	qedf->fast_sge_ios = 0;

 	return count;
 }

 static int
 qedf_offload_stats_show(struct seq_file *s, void *unused)
 {
 	struct qedf_ctx *qedf = s->private;
 	struct qed_fcoe_stats *fw_fcoe_stats;

 	fw_fcoe_stats = kmalloc(sizeof(struct qed_fcoe_stats), GFP_KERNEL);
 	if (!fw_fcoe_stats) {
 		QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate memory for "
 		    "fw_fcoe_stats.\n");
 		goto out;
 	}

 	/* Query firmware for offload stats */
 	qed_ops->get_stats(qedf->cdev, fw_fcoe_stats);

 	seq_printf(s, "fcoe_rx_byte_cnt=%llu\n"
 	    "fcoe_rx_data_pkt_cnt=%llu\n"
 	    "fcoe_rx_xfer_pkt_cnt=%llu\n"
 	    "fcoe_rx_other_pkt_cnt=%llu\n"
 	    "fcoe_silent_drop_pkt_cmdq_full_cnt=%u\n"
 	    "fcoe_silent_drop_pkt_crc_error_cnt=%u\n"
 	    "fcoe_silent_drop_pkt_task_invalid_cnt=%u\n"
 	    "fcoe_silent_drop_total_pkt_cnt=%u\n"
 	    "fcoe_silent_drop_pkt_rq_full_cnt=%u\n"
 	    "fcoe_tx_byte_cnt=%llu\n"
 	    "fcoe_tx_data_pkt_cnt=%llu\n"
 	    "fcoe_tx_xfer_pkt_cnt=%llu\n"
 	    "fcoe_tx_other_pkt_cnt=%llu\n",
 	    fw_fcoe_stats->fcoe_rx_byte_cnt,
 	    fw_fcoe_stats->fcoe_rx_data_pkt_cnt,
 	    fw_fcoe_stats->fcoe_rx_xfer_pkt_cnt,
 	    fw_fcoe_stats->fcoe_rx_other_pkt_cnt,
 	    fw_fcoe_stats->fcoe_silent_drop_pkt_cmdq_full_cnt,
 	    fw_fcoe_stats->fcoe_silent_drop_pkt_crc_error_cnt,
 	    fw_fcoe_stats->fcoe_silent_drop_pkt_task_invalid_cnt,
 	    fw_fcoe_stats->fcoe_silent_drop_total_pkt_cnt,
 	    fw_fcoe_stats->fcoe_silent_drop_pkt_rq_full_cnt,
 	    fw_fcoe_stats->fcoe_tx_byte_cnt,
 	    fw_fcoe_stats->fcoe_tx_data_pkt_cnt,
 	    fw_fcoe_stats->fcoe_tx_xfer_pkt_cnt,
 	    fw_fcoe_stats->fcoe_tx_other_pkt_cnt);

 	kfree(fw_fcoe_stats);
 out:
 	return 0;
 }

 static int
 qedf_dbg_offload_stats_open(struct inode *inode, struct file *file)
 {
 	struct qedf_dbg_ctx *qedf_dbg = inode->i_private;
 	struct qedf_ctx *qedf = container_of(qedf_dbg,
 	    struct qedf_ctx, dbg_ctx);

 	return single_open(file, qedf_offload_stats_show, qedf);
 }


 const struct file_operations qedf_dbg_fops[] = {
 	qedf_dbg_fileops(qedf, fp_int),
 	qedf_dbg_fileops_seq(qedf, io_trace),
 	qedf_dbg_fileops(qedf, debug),
 	qedf_dbg_fileops(qedf, stop_io_on_error),
 	qedf_dbg_fileops_seq(qedf, driver_stats),
 	qedf_dbg_fileops(qedf, clear_stats),
 	qedf_dbg_fileops_seq(qedf, offload_stats),
 	/* This must be last */
 	{ },
 };

 #else /* CONFIG_DEBUG_FS */
 void qedf_dbg_host_init(struct qedf_dbg_ctx *);
 void qedf_dbg_host_exit(struct qedf_dbg_ctx *);
 void qedf_dbg_init(char *);
 void qedf_dbg_exit(void);
 #endif /* CONFIG_DEBUG_FS */
	/*
	* QLogic FCoE Offload Driver
	* Copyright (c) 2016 QLogic Corporation
	*
	* This software is available under the terms of the GNU General Public License
	* (GPL) Version 2, available from the file COPYING in the main directory of
	* this source tree.
	*/
	#ifdef CONFIG_DEBUG_FS

	#include <linux/uaccess.h>
	#include <linux/debugfs.h>
	#include <linux/module.h>

	#include "qedf.h"
	#include "qedf_dbg.h"

	static struct dentry *qedf_dbg_root;

	/**
	* qedf_dbg_host_init - setup the debugfs file for the pf
	* @pf: the pf that is starting up
	**/
	void
	qedf_dbg_host_init(struct qedf_dbg_ctx *qedf,
	struct qedf_debugfs_ops *dops,
	struct file_operations *fops)
	{
	char host_dirname[32];
	struct dentry *file_dentry = NULL;

	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "Creating debugfs host node\n");
	/* create pf dir */
	sprintf(host_dirname, "host%u", qedf->host_no);
	qedf->bdf_dentry = debugfs_create_dir(host_dirname, qedf_dbg_root);
	if (!qedf->bdf_dentry)
	return;

	/* create debugfs files */
	while (dops) {
	if (!(dops->name))
	break;

	file_dentry = debugfs_create_file(dops->name, 0600,
	qedf->bdf_dentry, qedf,
	fops);
	if (!file_dentry) {
	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS,
	"Debugfs entry %s creation failed\n",
	dops->name);
	debugfs_remove_recursive(qedf->bdf_dentry);
	return;
	}
	dops++;
	fops++;
	}
	}

	/**
	* qedf_dbg_host_exit - clear out the pf's debugfs entries
	* @pf: the pf that is stopping
	**/
	void
	qedf_dbg_host_exit(struct qedf_dbg_ctx *qedf)
	{
	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "Destroying debugfs host "
	"entry\n");
	/* remove debugfs entries of this PF */
	debugfs_remove_recursive(qedf->bdf_dentry);
	qedf->bdf_dentry = NULL;
	}

	/**
	* qedf_dbg_init - start up debugfs for the driver
	**/
	void
	qedf_dbg_init(char *drv_name)
	{
	QEDF_INFO(NULL, QEDF_LOG_DEBUGFS, "Creating debugfs root node\n");

	/* create qed dir in root of debugfs. NULL means debugfs root */
	qedf_dbg_root = debugfs_create_dir(drv_name, NULL);
	if (!qedf_dbg_root)
	QEDF_INFO(NULL, QEDF_LOG_DEBUGFS, "Init of debugfs "
	"failed\n");
	}

	/**
	* qedf_dbg_exit - clean out the driver's debugfs entries
	**/
	void
	qedf_dbg_exit(void)
	{
	QEDF_INFO(NULL, QEDF_LOG_DEBUGFS, "Destroying debugfs root "
	"entry\n");

	/* remove qed dir in root of debugfs */
	debugfs_remove_recursive(qedf_dbg_root);
	qedf_dbg_root = NULL;
	}

	struct qedf_debugfs_ops qedf_debugfs_ops[] = {
	{ "fp_int", NULL },
	{ "io_trace", NULL },
	{ "debug", NULL },
	{ "stop_io_on_error", NULL},
	{ "driver_stats", NULL},
	{ "clear_stats", NULL},
	{ "offload_stats", NULL},
	/* This must be last */
	{ NULL, NULL }
	};

	DECLARE_PER_CPU(struct qedf_percpu_iothread_s, qedf_percpu_iothreads);

	static ssize_t
	qedf_dbg_fp_int_cmd_read(struct file filp, char __user buffer, size_t count,
	loff_t *ppos)
	{
	size_t cnt = 0;
	int id;
	struct qedf_fastpath *fp = NULL;
	struct qedf_dbg_ctx *qedf_dbg =
	(struct qedf_dbg_ctx *)filp->private_data;
	struct qedf_ctx *qedf = container_of(qedf_dbg,
	struct qedf_ctx, dbg_ctx);

	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");

	cnt = sprintf(buffer, "\nFastpath I/O completions\n\n");

	for (id = 0; id < qedf->num_queues; id++) {
	fp = &(qedf->fp_array[id]);
	if (fp->sb_id == QEDF_SB_ID_NULL)
	continue;
	cnt += sprintf((buffer + cnt), "#%d: %lu\n", id,
	fp->completions);
	}

	cnt = min_t(int, count, cnt - *ppos);
	*ppos += cnt;
	return cnt;
	}

	static ssize_t
	qedf_dbg_fp_int_cmd_write(struct file filp, const char __user buffer,
	size_t count, loff_t *ppos)
	{
	if (!count \|\| *ppos)
	return 0;

	return count;
	}

	static ssize_t
	qedf_dbg_debug_cmd_read(struct file filp, char __user buffer, size_t count,
	loff_t *ppos)
	{
	int cnt;
	struct qedf_dbg_ctx *qedf =
	(struct qedf_dbg_ctx *)filp->private_data;

	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "entered\n");
	cnt = sprintf(buffer, "debug mask = 0x%x\n", qedf_debug);

	cnt = min_t(int, count, cnt - *ppos);
	*ppos += cnt;
	return cnt;
	}

	static ssize_t
	qedf_dbg_debug_cmd_write(struct file filp, const char __user buffer,
	size_t count, loff_t *ppos)
	{
	uint32_t val;
	void *kern_buf;
	int rval;
	struct qedf_dbg_ctx *qedf =
	(struct qedf_dbg_ctx *)filp->private_data;

	if (!count \|\| *ppos)
	return 0;

	kern_buf = memdup_user(buffer, count);
	if (IS_ERR(kern_buf))
	return PTR_ERR(kern_buf);

	rval = kstrtouint(kern_buf, 10, &val);
	kfree(kern_buf);
	if (rval)
	return rval;

	if (val == 1)
	qedf_debug = QEDF_DEFAULT_LOG_MASK;
	else
	qedf_debug = val;

	QEDF_INFO(qedf, QEDF_LOG_DEBUGFS, "Setting debug=0x%x.\n", val);
	return count;
	}

	static ssize_t
	qedf_dbg_stop_io_on_error_cmd_read(struct file filp, char __user buffer,
	size_t count, loff_t *ppos)
	{
	int cnt;
	struct qedf_dbg_ctx *qedf_dbg =
	(struct qedf_dbg_ctx *)filp->private_data;
	struct qedf_ctx *qedf = container_of(qedf_dbg,
	struct qedf_ctx, dbg_ctx);

	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");
	cnt = sprintf(buffer, "%s\n",
	qedf->stop_io_on_error ? "true" : "false");

	cnt = min_t(int, count, cnt - *ppos);
	*ppos += cnt;
	return cnt;
	}

	static ssize_t
	qedf_dbg_stop_io_on_error_cmd_write(struct file *filp,
	const char __user *buffer, size_t count,
	loff_t *ppos)
	{
	void *kern_buf;
	struct qedf_dbg_ctx *qedf_dbg =
	(struct qedf_dbg_ctx *)filp->private_data;
	struct qedf_ctx *qedf = container_of(qedf_dbg, struct qedf_ctx,
	dbg_ctx);

	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");

	if (!count \|\| *ppos)
	return 0;

	kern_buf = memdup_user(buffer, 6);
	if (IS_ERR(kern_buf))
	return PTR_ERR(kern_buf);

	if (strncmp(kern_buf, "false", 5) == 0)
	qedf->stop_io_on_error = false;
	else if (strncmp(kern_buf, "true", 4) == 0)
	qedf->stop_io_on_error = true;
	else if (strncmp(kern_buf, "now", 3) == 0)
	/* Trigger from user to stop all I/O on this host */
	set_bit(QEDF_DBG_STOP_IO, &qedf->flags);

	kfree(kern_buf);
	return count;
	}

	static int
	qedf_io_trace_show(struct seq_file s, void unused)
	{
	int i, idx = 0;
	struct qedf_ctx *qedf = s->private;
	struct qedf_dbg_ctx *qedf_dbg = &qedf->dbg_ctx;
	struct qedf_io_log *io_log;
	unsigned long flags;

	if (!qedf_io_tracing) {
	seq_puts(s, "I/O tracing not enabled.\n");
	goto out;
	}

	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "entered\n");

	spin_lock_irqsave(&qedf->io_trace_lock, flags);
	idx = qedf->io_trace_idx;
	for (i = 0; i < QEDF_IO_TRACE_SIZE; i++) {
	io_log = &qedf->io_trace_buf[idx];
	seq_printf(s, "%d:", io_log->direction);
	seq_printf(s, "0x%x:", io_log->task_id);
	seq_printf(s, "0x%06x:", io_log->port_id);
	seq_printf(s, "%d:", io_log->lun);
	seq_printf(s, "0x%02x:", io_log->op);
	seq_printf(s, "0x%02x%02x%02x%02x:", io_log->lba[0],
	io_log->lba[1], io_log->lba[2], io_log->lba[3]);
	seq_printf(s, "%d:", io_log->bufflen);
	seq_printf(s, "%d:", io_log->sg_count);
	seq_printf(s, "0x%08x:", io_log->result);
	seq_printf(s, "%lu:", io_log->jiffies);
	seq_printf(s, "%d:", io_log->refcount);
	seq_printf(s, "%d:", io_log->req_cpu);
	seq_printf(s, "%d:", io_log->int_cpu);
	seq_printf(s, "%d:", io_log->rsp_cpu);
	seq_printf(s, "%d\n", io_log->sge_type);

	idx++;
	if (idx == QEDF_IO_TRACE_SIZE)
	idx = 0;
	}
	spin_unlock_irqrestore(&qedf->io_trace_lock, flags);

	out:
	return 0;
	}

	static int
	qedf_dbg_io_trace_open(struct inode inode, struct file file)
	{
	struct qedf_dbg_ctx *qedf_dbg = inode->i_private;
	struct qedf_ctx *qedf = container_of(qedf_dbg,
	struct qedf_ctx, dbg_ctx);

	return single_open(file, qedf_io_trace_show, qedf);
	}

	static int
	qedf_driver_stats_show(struct seq_file s, void unused)
	{
	struct qedf_ctx *qedf = s->private;
	struct qedf_rport *fcport;
	struct fc_rport_priv *rdata;

	seq_printf(s, "cmg_mgr free io_reqs: %d\n",
	atomic_read(&qedf->cmd_mgr->free_list_cnt));
	seq_printf(s, "slow SGEs: %d\n", qedf->slow_sge_ios);
	seq_printf(s, "single SGEs: %d\n", qedf->single_sge_ios);
	seq_printf(s, "fast SGEs: %d\n\n", qedf->fast_sge_ios);

	seq_puts(s, "Offloaded ports:\n\n");

	rcu_read_lock();
	list_for_each_entry_rcu(fcport, &qedf->fcports, peers) {
	rdata = fcport->rdata;
	if (rdata == NULL)
	continue;
	seq_printf(s, "%06x: free_sqes: %d, num_active_ios: %d\n",
	rdata->ids.port_id, atomic_read(&fcport->free_sqes),
	atomic_read(&fcport->num_active_ios));
	}
	rcu_read_unlock();

	return 0;
	}

	static int
	qedf_dbg_driver_stats_open(struct inode inode, struct file file)
	{
	struct qedf_dbg_ctx *qedf_dbg = inode->i_private;
	struct qedf_ctx *qedf = container_of(qedf_dbg,
	struct qedf_ctx, dbg_ctx);

	return single_open(file, qedf_driver_stats_show, qedf);
	}

	static ssize_t
	qedf_dbg_clear_stats_cmd_read(struct file filp, char __user buffer,
	size_t count, loff_t *ppos)
	{
	int cnt = 0;

	/* Essentially a read stub */
	cnt = min_t(int, count, cnt - *ppos);
	*ppos += cnt;
	return cnt;
	}

	static ssize_t
	qedf_dbg_clear_stats_cmd_write(struct file *filp,
	const char __user *buffer, size_t count,
	loff_t *ppos)
	{
	struct qedf_dbg_ctx *qedf_dbg =
	(struct qedf_dbg_ctx *)filp->private_data;
	struct qedf_ctx *qedf = container_of(qedf_dbg, struct qedf_ctx,
	dbg_ctx);

	QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "Clearing stat counters.\n");

	if (!count \|\| *ppos)
	return 0;

	/* Clear stat counters exposed by 'stats' node */
	qedf->slow_sge_ios = 0;
	qedf->single_sge_ios = 0;
	qedf->fast_sge_ios = 0;

	return count;
	}

	static int
	qedf_offload_stats_show(struct seq_file s, void unused)
	{
	struct qedf_ctx *qedf = s->private;
	struct qed_fcoe_stats *fw_fcoe_stats;

	fw_fcoe_stats = kmalloc(sizeof(struct qed_fcoe_stats), GFP_KERNEL);
	if (!fw_fcoe_stats) {
	QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate memory for "
	"fw_fcoe_stats.\n");
	goto out;
	}

	/* Query firmware for offload stats */
	qed_ops->get_stats(qedf->cdev, fw_fcoe_stats);

	seq_printf(s, "fcoe_rx_byte_cnt=%llu\n"
	"fcoe_rx_data_pkt_cnt=%llu\n"
	"fcoe_rx_xfer_pkt_cnt=%llu\n"
	"fcoe_rx_other_pkt_cnt=%llu\n"
	"fcoe_silent_drop_pkt_cmdq_full_cnt=%u\n"
	"fcoe_silent_drop_pkt_crc_error_cnt=%u\n"
	"fcoe_silent_drop_pkt_task_invalid_cnt=%u\n"
	"fcoe_silent_drop_total_pkt_cnt=%u\n"
	"fcoe_silent_drop_pkt_rq_full_cnt=%u\n"
	"fcoe_tx_byte_cnt=%llu\n"
	"fcoe_tx_data_pkt_cnt=%llu\n"
	"fcoe_tx_xfer_pkt_cnt=%llu\n"
	"fcoe_tx_other_pkt_cnt=%llu\n",
	fw_fcoe_stats->fcoe_rx_byte_cnt,
	fw_fcoe_stats->fcoe_rx_data_pkt_cnt,
	fw_fcoe_stats->fcoe_rx_xfer_pkt_cnt,
	fw_fcoe_stats->fcoe_rx_other_pkt_cnt,
	fw_fcoe_stats->fcoe_silent_drop_pkt_cmdq_full_cnt,
	fw_fcoe_stats->fcoe_silent_drop_pkt_crc_error_cnt,
	fw_fcoe_stats->fcoe_silent_drop_pkt_task_invalid_cnt,
	fw_fcoe_stats->fcoe_silent_drop_total_pkt_cnt,
	fw_fcoe_stats->fcoe_silent_drop_pkt_rq_full_cnt,
	fw_fcoe_stats->fcoe_tx_byte_cnt,
	fw_fcoe_stats->fcoe_tx_data_pkt_cnt,
	fw_fcoe_stats->fcoe_tx_xfer_pkt_cnt,
	fw_fcoe_stats->fcoe_tx_other_pkt_cnt);

	kfree(fw_fcoe_stats);
	out:
	return 0;
	}

	static int
	qedf_dbg_offload_stats_open(struct inode inode, struct file file)
	{
	struct qedf_dbg_ctx *qedf_dbg = inode->i_private;
	struct qedf_ctx *qedf = container_of(qedf_dbg,
	struct qedf_ctx, dbg_ctx);

	return single_open(file, qedf_offload_stats_show, qedf);
	}


	const struct file_operations qedf_dbg_fops[] = {
	qedf_dbg_fileops(qedf, fp_int),
	qedf_dbg_fileops_seq(qedf, io_trace),
	qedf_dbg_fileops(qedf, debug),
	qedf_dbg_fileops(qedf, stop_io_on_error),
	qedf_dbg_fileops_seq(qedf, driver_stats),
	qedf_dbg_fileops(qedf, clear_stats),
	qedf_dbg_fileops_seq(qedf, offload_stats),
	/* This must be last */
	{ },
	};

	#else /* CONFIG_DEBUG_FS */
	void qedf_dbg_host_init(struct qedf_dbg_ctx *);
	void qedf_dbg_host_exit(struct qedf_dbg_ctx *);
	void qedf_dbg_init(char *);
	void qedf_dbg_exit(void);
	#endif /* CONFIG_DEBUG_FS */