drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c

/*******************************************************************************

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 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.

  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 St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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

#include "ixgbe.h"

static struct dentry *ixgbe_dbg_root;

static char ixgbe_dbg_reg_ops_buf[256] = "";

/**
 * ixgbe_dbg_reg_ops_read - read for reg_ops datum
 * @filp: the opened file
 * @buffer: where to write the data for the user to read
 * @count: the size of the user's buffer
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_reg_ops_read(struct file *filp, char __user *buffer,
				    size_t count, loff_t *ppos)
{
	struct ixgbe_adapter *adapter = filp->private_data;
	char *buf;
	int len;

	/* don't allow partial reads */
	if (*ppos != 0)
		return 0;

	buf = kasprintf(GFP_KERNEL, "%s: %s\n",
			adapter->netdev->name,
			ixgbe_dbg_reg_ops_buf);
	if (!buf)
		return -ENOMEM;

	if (count < strlen(buf)) {
		kfree(buf);
		return -ENOSPC;
	}

	len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));

	kfree(buf);
	return len;
}

/**
 * ixgbe_dbg_reg_ops_write - write into reg_ops datum
 * @filp: the opened file
 * @buffer: where to find the user's data
 * @count: the length of the user's data
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_reg_ops_write(struct file *filp,
				     const char __user *buffer,
				     size_t count, loff_t *ppos)
{
	struct ixgbe_adapter *adapter = filp->private_data;
	int len;

	/* don't allow partial writes */
	if (*ppos != 0)
		return 0;
	if (count >= sizeof(ixgbe_dbg_reg_ops_buf))
		return -ENOSPC;

	len = simple_write_to_buffer(ixgbe_dbg_reg_ops_buf,
				     sizeof(ixgbe_dbg_reg_ops_buf)-1,
				     ppos,
				     buffer,
				     count);
	if (len < 0)
		return len;

	ixgbe_dbg_reg_ops_buf[len] = '\0';

	if (strncmp(ixgbe_dbg_reg_ops_buf, "write", 5) == 0) {
		u32 reg, value;
		int cnt;
		cnt = sscanf(&ixgbe_dbg_reg_ops_buf[5], "%x %x", &reg, &value);
		if (cnt == 2) {
			IXGBE_WRITE_REG(&adapter->hw, reg, value);
			value = IXGBE_READ_REG(&adapter->hw, reg);
			e_dev_info("write: 0x%08x = 0x%08x\n", reg, value);
		} else {
			e_dev_info("write <reg> <value>\n");
		}
	} else if (strncmp(ixgbe_dbg_reg_ops_buf, "read", 4) == 0) {
		u32 reg, value;
		int cnt;
		cnt = sscanf(&ixgbe_dbg_reg_ops_buf[4], "%x", &reg);
		if (cnt == 1) {
			value = IXGBE_READ_REG(&adapter->hw, reg);
			e_dev_info("read 0x%08x = 0x%08x\n", reg, value);
		} else {
			e_dev_info("read <reg>\n");
		}
	} else {
		e_dev_info("Unknown command %s\n", ixgbe_dbg_reg_ops_buf);
		e_dev_info("Available commands:\n");
		e_dev_info("   read <reg>\n");
		e_dev_info("   write <reg> <value>\n");
	}
	return count;
}

static const struct file_operations ixgbe_dbg_reg_ops_fops = {
	.owner = THIS_MODULE,
	.open = simple_open,
	.read =  ixgbe_dbg_reg_ops_read,
	.write = ixgbe_dbg_reg_ops_write,
};

static char ixgbe_dbg_netdev_ops_buf[256] = "";

/**
 * ixgbe_dbg_netdev_ops_read - read for netdev_ops datum
 * @filp: the opened file
 * @buffer: where to write the data for the user to read
 * @count: the size of the user's buffer
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_netdev_ops_read(struct file *filp,
					 char __user *buffer,
					 size_t count, loff_t *ppos)
{
	struct ixgbe_adapter *adapter = filp->private_data;
	char *buf;
	int len;

	/* don't allow partial reads */
	if (*ppos != 0)
		return 0;

	buf = kasprintf(GFP_KERNEL, "%s: %s\n",
			adapter->netdev->name,
			ixgbe_dbg_netdev_ops_buf);
	if (!buf)
		return -ENOMEM;

	if (count < strlen(buf)) {
		kfree(buf);
		return -ENOSPC;
	}

	len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));

	kfree(buf);
	return len;
}

/**
 * ixgbe_dbg_netdev_ops_write - write into netdev_ops datum
 * @filp: the opened file
 * @buffer: where to find the user's data
 * @count: the length of the user's data
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_netdev_ops_write(struct file *filp,
					  const char __user *buffer,
					  size_t count, loff_t *ppos)
{
	struct ixgbe_adapter *adapter = filp->private_data;
	int len;

	/* don't allow partial writes */
	if (*ppos != 0)
		return 0;
	if (count >= sizeof(ixgbe_dbg_netdev_ops_buf))
		return -ENOSPC;

	len = simple_write_to_buffer(ixgbe_dbg_netdev_ops_buf,
				     sizeof(ixgbe_dbg_netdev_ops_buf)-1,
				     ppos,
				     buffer,
				     count);
	if (len < 0)
		return len;

	ixgbe_dbg_netdev_ops_buf[len] = '\0';

	if (strncmp(ixgbe_dbg_netdev_ops_buf, "tx_timeout", 10) == 0) {
		adapter->netdev->netdev_ops->ndo_tx_timeout(adapter->netdev);
		e_dev_info("tx_timeout called\n");
	} else {
		e_dev_info("Unknown command: %s\n", ixgbe_dbg_netdev_ops_buf);
		e_dev_info("Available commands:\n");
		e_dev_info("    tx_timeout\n");
	}
	return count;
}

static const struct file_operations ixgbe_dbg_netdev_ops_fops = {
	.owner = THIS_MODULE,
	.open = simple_open,
	.read = ixgbe_dbg_netdev_ops_read,
	.write = ixgbe_dbg_netdev_ops_write,
};

/**
 * ixgbe_dbg_adapter_init - setup the debugfs directory for the adapter
 * @adapter: the adapter that is starting up
 **/
void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter)
{
	const char *name = pci_name(adapter->pdev);
	struct dentry *pfile;
	adapter->ixgbe_dbg_adapter = debugfs_create_dir(name, ixgbe_dbg_root);
	if (adapter->ixgbe_dbg_adapter) {
		pfile = debugfs_create_file("reg_ops", 0600,
					    adapter->ixgbe_dbg_adapter, adapter,
					    &ixgbe_dbg_reg_ops_fops);
		if (!pfile)
			e_dev_err("debugfs reg_ops for %s failed\n", name);
		pfile = debugfs_create_file("netdev_ops", 0600,
					    adapter->ixgbe_dbg_adapter, adapter,
					    &ixgbe_dbg_netdev_ops_fops);
		if (!pfile)
			e_dev_err("debugfs netdev_ops for %s failed\n", name);
	} else {
		e_dev_err("debugfs entry for %s failed\n", name);
	}
}

/**
 * ixgbe_dbg_adapter_exit - clear out the adapter's debugfs entries
 * @pf: the pf that is stopping
 **/
void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter)
{
	if (adapter->ixgbe_dbg_adapter)
		debugfs_remove_recursive(adapter->ixgbe_dbg_adapter);
	adapter->ixgbe_dbg_adapter = NULL;
}

/**
 * ixgbe_dbg_init - start up debugfs for the driver
 **/
void ixgbe_dbg_init(void)
{
	ixgbe_dbg_root = debugfs_create_dir(ixgbe_driver_name, NULL);
	if (ixgbe_dbg_root == NULL)
		pr_err("init of debugfs failed\n");
}

/**
 * ixgbe_dbg_exit - clean out the driver's debugfs entries
 **/
void ixgbe_dbg_exit(void)
{
	debugfs_remove_recursive(ixgbe_dbg_root);
}