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