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// SPDX-License-Identifier: GPL-2.0
/*
* CMA DebugFS Interface
*
* Copyright (c) 2015 Sasha Levin <sasha.levin@oracle.com>
*
* Copyright (C) 2022 Rockchip Electronics Co. Ltd.
*
*/
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/cma.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm_types.h>
#include "cma.h"
static size_t
u32_format_array_hex(char *buf, size_t bufsize, u32 *array, int array_size)
{
int i = 0;
while (--array_size >= 0) {
size_t len;
char term = (array_size && (++i % 8)) ? ' ' : '\n';
len = snprintf(buf, bufsize, "%08X%c", *array++, term);
buf += len;
bufsize -= len;
}
return 0;
}
static int u32_array_open_hex(struct inode *inode, struct file *file)
{
struct debugfs_u32_array *data = inode->i_private;
int size, elements = data->n_elements;
char *buf;
/*
* Max size:
* - 8 digits + ' '/'\n' = 9 bytes per number
* - terminating NUL character
*/
size = elements * 9;
buf = kmalloc(size + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf[size] = 0;
file->private_data = buf;
u32_format_array_hex(buf, size + 1, data->array, data->n_elements);
return nonseekable_open(inode, file);
}
static ssize_t
u32_array_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
{
size_t size = strlen(file->private_data);
return simple_read_from_buffer(buf, len, ppos,
file->private_data, size);
}
static int u32_array_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
return 0;
}
static const struct file_operations u32_array_hex_fops = {
.owner = THIS_MODULE,
.open = u32_array_open_hex,
.release = u32_array_release,
.read = u32_array_read,
.llseek = no_llseek,
};
static void debugfs_create_u32_array_hex(const char *name, umode_t mode,
struct dentry *parent,
struct debugfs_u32_array *array)
{
debugfs_create_file_unsafe(name, mode, parent, array, &u32_array_hex_fops);
}
static int cma_debugfs_add_one(struct cma *cma, struct dentry *root_dentry)
{
struct dentry *tmp;
char name[16];
scnprintf(name, sizeof(name), "cma-%s", cma->name);
tmp = debugfs_lookup(name, root_dentry);
if (!tmp)
return -EPROBE_DEFER;
debugfs_create_u32_array_hex("bitmap_hex", 0444, tmp, &cma->dfs_bitmap);
return 0;
}
static int __init rk_cma_debugfs_init(void)
{
struct dentry *cma_debugfs_root;
int ret;
int i;
cma_debugfs_root = debugfs_lookup("cma", NULL);
if (!cma_debugfs_root)
return -EPROBE_DEFER;
for (i = 0; i < cma_area_count; i++) {
ret = cma_debugfs_add_one(&cma_areas[i], cma_debugfs_root);
if (ret)
return ret;
}
return 0;
}
late_initcall(rk_cma_debugfs_init);
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