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Commit 91fbd8f0 authored by Catherine Sullivan's avatar Catherine Sullivan Committed by Jeff Kirsher
Browse files

ixgbe: added reg_ops file to debugfs 



Added the reg_ops file to debugfs with commands to read and write
a register to give users the ability to read and write individual
registers on the fly.

Signed-off-by: default avatarCatherine Sullivan <catherine.sullivan@intel.com>
Tested-by: default avatarPhil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 826ff0de

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

+118 −0
Original line number Diff line number Diff line
@@ -34,6 +34,119 @@ 


static struct dentry *ixgbe_dbg_root;



static char ixgbe_dbg_reg_ops_buf[256] = "";



/**

 * ixgbe_dbg_reg_ops_open - prep the debugfs pokee data item when opened

 * @inode: inode that was opened

 * @filp:  file info

 *

 * Stash the adapter pointer hiding in the inode into the file pointer where

 * we can find it later in the read and write calls

 **/

static int ixgbe_dbg_reg_ops_open(struct inode *inode, struct file *filp)

{

	filp->private_data = inode->i_private;

	return 0;

}



/**

 * 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[256];

	int bytes_not_copied;

	int len;



	/* don't allow partial reads */

	if (*ppos != 0)

		return 0;



	len = snprintf(buf, sizeof(buf), "%s: %s\n",

		       adapter->netdev->name, ixgbe_dbg_reg_ops_buf);

	if (count < len)

		return -ENOSPC;

	bytes_not_copied = copy_to_user(buffer, buf, len);

	if (bytes_not_copied < 0)

		return bytes_not_copied;



	*ppos = len;

	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 bytes_not_copied;



	/* don't allow partial writes */

	if (*ppos != 0)

		return 0;

	if (count >= sizeof(ixgbe_dbg_reg_ops_buf))

		return -ENOSPC;



	bytes_not_copied = copy_from_user(ixgbe_dbg_reg_ops_buf, buffer, count);

	if (bytes_not_copied < 0)

		return bytes_not_copied;

	else if (bytes_not_copied < count)

		count -= bytes_not_copied;

	else

		return -ENOSPC;

	ixgbe_dbg_reg_ops_buf[count] = '\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 =  ixgbe_dbg_reg_ops_open,

	.read =  ixgbe_dbg_reg_ops_read,

	.write = ixgbe_dbg_reg_ops_write,

};



static char ixgbe_dbg_netdev_ops_buf[256] = "";



/**
@@ -140,6 +253,11 @@ void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter) 
	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);