linux/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c

/*
 * This file is part of the Chelsio T4 Ethernet driver for Linux.
 *
 * Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed 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, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/string_helpers.h>
#include <linux/sort.h>

#include "cxgb4.h"
#include "t4_regs.h"
#include "t4fw_api.h"
#include "cxgb4_debugfs.h"
#include "l2t.h"

static ssize_t mem_read(struct file *file, char __user *buf, size_t count,
			loff_t *ppos)
{
	loff_t pos = *ppos;
	loff_t avail = file_inode(file)->i_size;
	unsigned int mem = (uintptr_t)file->private_data & 3;
	struct adapter *adap = file->private_data - mem;
	__be32 *data;
	int ret;

	if (pos < 0)
		return -EINVAL;
	if (pos >= avail)
		return 0;
	if (count > avail - pos)
		count = avail - pos;

	data = t4_alloc_mem(count);
	if (!data)
		return -ENOMEM;

	spin_lock(&adap->win0_lock);
	ret = t4_memory_rw(adap, 0, mem, pos, count, data, T4_MEMORY_READ);
	spin_unlock(&adap->win0_lock);
	if (ret) {
		t4_free_mem(data);
		return ret;
	}
	ret = copy_to_user(buf, data, count);

	t4_free_mem(data);
	if (ret)
		return -EFAULT;

	*ppos = pos + count;
	return count;
}

static const struct file_operations mem_debugfs_fops = {
	.owner   = THIS_MODULE,
	.open    = simple_open,
	.read    = mem_read,
	.llseek  = default_llseek,
};

static void add_debugfs_mem(struct adapter *adap, const char *name,
			    unsigned int idx, unsigned int size_mb)
{
	struct dentry *de;

	de = debugfs_create_file(name, S_IRUSR, adap->debugfs_root,
				 (void *)adap + idx, &mem_debugfs_fops);
	if (de && de->d_inode)
		de->d_inode->i_size = size_mb << 20;
}

/* Add an array of Debug FS files.
 */
void add_debugfs_files(struct adapter *adap,
		       struct t4_debugfs_entry *files,
		       unsigned int nfiles)
{
	int i;

	/* debugfs support is best effort */
	for (i = 0; i < nfiles; i++)
		debugfs_create_file(files[i].name, files[i].mode,
				    adap->debugfs_root,
				    (void *)adap + files[i].data,
				    files[i].ops);
}

int t4_setup_debugfs(struct adapter *adap)
{
	int i;
	u32 size;

	static struct t4_debugfs_entry t4_debugfs_files[] = {
		{ "l2t", &t4_l2t_fops, S_IRUSR, 0},
	};

	add_debugfs_files(adap,
			  t4_debugfs_files,
			  ARRAY_SIZE(t4_debugfs_files));

	i = t4_read_reg(adap, MA_TARGET_MEM_ENABLE_A);
	if (i & EDRAM0_ENABLE_F) {
		size = t4_read_reg(adap, MA_EDRAM0_BAR_A);
		add_debugfs_mem(adap, "edc0", MEM_EDC0, EDRAM0_SIZE_G(size));
	}
	if (i & EDRAM1_ENABLE_F) {
		size = t4_read_reg(adap, MA_EDRAM1_BAR_A);
		add_debugfs_mem(adap, "edc1", MEM_EDC1, EDRAM1_SIZE_G(size));
	}
	if (is_t4(adap->params.chip)) {
		size = t4_read_reg(adap, MA_EXT_MEMORY_BAR_A);
		if (i & EXT_MEM_ENABLE_F)
			add_debugfs_mem(adap, "mc", MEM_MC,
					EXT_MEM_SIZE_G(size));
	} else {
		if (i & EXT_MEM0_ENABLE_F) {
			size = t4_read_reg(adap, MA_EXT_MEMORY0_BAR_A);
			add_debugfs_mem(adap, "mc0", MEM_MC0,
					EXT_MEM0_SIZE_G(size));
		}
		if (i & EXT_MEM1_ENABLE_F) {
			size = t4_read_reg(adap, MA_EXT_MEMORY1_BAR_A);
			add_debugfs_mem(adap, "mc1", MEM_MC1,
					EXT_MEM1_SIZE_G(size));
		}
	}
	return 0;
}