53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Debugfs for reserved memory blocks.
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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/init.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/memblock.h>
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#define K(size) ((unsigned long)((size) >> 10))
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static int memblock_debugfs_show(struct seq_file *m, void *private)
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{
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struct memblock_type *type = m->private;
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struct memblock_region *reg;
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int i;
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phys_addr_t end;
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unsigned long z = 0, t = 0;
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for (i = 0; i < type->cnt; i++) {
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reg = &type->regions[i];
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end = reg->base + reg->size - 1;
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z = (unsigned long)reg->size;
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t += z;
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seq_printf(m, "%4d: ", i);
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seq_printf(m, "%pa..%pa (%10lu %s)\n", ®->base, &end,
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(z >= 1024) ? (K(z)) : z,
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(z >= 1024) ? "KiB" : "Bytes");
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}
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seq_printf(m, "Total: %lu KiB\n", K(t));
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(memblock_debugfs);
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static int __init memblock_debugfs_init(void)
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{
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struct dentry *root = debugfs_lookup("memblock", NULL);
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if (!root)
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return -EPROBE_DEFER;
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debugfs_create_file("reserved_size", 0444, root,
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&memblock.reserved, &memblock_debugfs_fops);
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return 0;
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}
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late_initcall(memblock_debugfs_init);
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