// SPDX-License-Identifier: GPL-2.0
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/*
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* CMA ProcFS Interface
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*
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* Copyright (C) 2022 Rockchip Electronics Co. Ltd.
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*/
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#include <linux/cma.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include "../../../mm/cma.h"
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static void cma_procfs_format_array(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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}
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static void cma_procfs_show_bitmap(struct seq_file *s, struct cma *cma)
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{
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int elements = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));
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int size = elements * 9;
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u32 *array = (u32 *)cma->bitmap;
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char *buf;
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buf = kmalloc(size + 1, GFP_KERNEL);
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if (!buf)
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return;
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buf[size] = 0;
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cma_procfs_format_array(buf, size + 1, array, elements);
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seq_printf(s, "%s", buf);
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kfree(buf);
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}
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static u64 cma_procfs_used_get(struct cma *cma)
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{
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unsigned long used;
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mutex_lock(&cma->lock);
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used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
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mutex_unlock(&cma->lock);
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return (u64)used << cma->order_per_bit;
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}
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static int cma_procfs_show(struct seq_file *s, void *private)
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{
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struct cma *cma = s->private;
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u64 used = cma_procfs_used_get(cma);
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seq_printf(s, "Total: %lu KiB\n", cma->count << (PAGE_SHIFT - 10));
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seq_printf(s, " Used: %llu KiB\n\n", used << (PAGE_SHIFT - 10));
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cma_procfs_show_bitmap(s, cma);
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return 0;
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}
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static int cma_procfs_add_one(struct cma *cma, void *data)
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{
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struct proc_dir_entry *root = data;
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proc_create_single_data(cma->name, 0, root, cma_procfs_show, cma);
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return 0;
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}
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static int rk_cma_procfs_init(void)
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{
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struct proc_dir_entry *root = proc_mkdir("rk_cma", NULL);
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return cma_for_each_area(cma_procfs_add_one, (void *)root);
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}
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late_initcall_sync(rk_cma_procfs_init);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jianqun Xu <jay.xu@rock-chips.com>");
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MODULE_DESCRIPTION("ROCKCHIP CMA PROCFS Driver");
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MODULE_ALIAS("platform:rk-cma");
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