From 1fc0ecb55feaa9c5850123755681e7f13e81d01f Mon Sep 17 00:00:00 2001 From: Jianqun Xu Date: Fri, 25 Mar 2022 09:26:22 +0800 Subject: [PATCH] mm/memblock: show memblock reserved with size information Tested on RV1106 EVB: cat /sys/kernel/debug/memblock/reserved_size 0: 0x00004000..0x00007fff ( 16 KiB) 1: 0x000081c0..0x0052e9c7 ( 5274 KiB) 2: 0x00c00000..0x00c08fff ( 36 KiB) 3: 0x0369c000..0x036bbfff ( 128 KiB) 4: 0x036bd8c0..0x036bdcc3 ( 1 KiB) 5: 0x036bdcc8..0x036d5ffb ( 96 KiB) 6: 0x036d6000..0x037fefff ( 1188 KiB) 7: 0x037ff240..0x037ff79b ( 1 KiB) 8: 0x037ff7c0..0x037ff837 ( 120 Bytes) 9: 0x037ff840..0x037ff843 ( 4 Bytes) 10: 0x037ff880..0x037ff883 ( 4 Bytes) 11: 0x037ff8c0..0x037ff8c3 ( 4 Bytes) 12: 0x037ff900..0x037ffa69 ( 362 Bytes) 13: 0x037ffa80..0x037ffbe9 ( 362 Bytes) 14: 0x037ffc00..0x037ffc03 ( 4 Bytes) 15: 0x037ffc1c..0x037ffc7e ( 99 Bytes) 16: 0x037ffc80..0x037ffc9a ( 27 Bytes) 17: 0x037ffc9c..0x037ffcb6 ( 27 Bytes) 18: 0x037ffcb8..0x037ffcd2 ( 27 Bytes) 19: 0x037ffcd4..0x037ffcee ( 27 Bytes) 20: 0x037ffcf0..0x037ffd0a ( 27 Bytes) 21: 0x037ffd0c..0x037ffe2c ( 289 Bytes) 22: 0x037ffe30..0x037ffe48 ( 25 Bytes) 23: 0x037ffe4c..0x037ffe64 ( 25 Bytes) 24: 0x037ffe68..0x037ffe80 ( 25 Bytes) 25: 0x037ffe84..0x037ffe9c ( 25 Bytes) 26: 0x037ffea0..0x037ffebc ( 29 Bytes) 27: 0x037ffec0..0x037ffedc ( 29 Bytes) 28: 0x037ffee0..0x037ffefc ( 29 Bytes) 29: 0x037fff00..0x037fff9c ( 157 Bytes) 30: 0x037fffa0..0x07ffffff ( 73728 KiB) Total: 80470 KiB Signed-off-by: Jianqun Xu Change-Id: If98946c9f2a70fa2816f2f1434a14198e2156d96 --- mm/Kconfig | 7 ++++++ mm/Makefile | 1 + mm/memblock_debugfs.c | 52 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 60 insertions(+) create mode 100644 mm/memblock_debugfs.c diff --git a/mm/Kconfig b/mm/Kconfig index 477b5eeca511..db74af09fe6d 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -63,6 +63,13 @@ config SPARSEMEM_MANUAL endchoice +config MEMBLOCK_DEBUGFS + bool "Memblock debugfs for reserved memory" + depends on DEBUG_FS && ARCH_KEEP_MEMBLOCK + help + Extend memblock debugfs to show size of each memblock, and shows the + result of total size by KiB format. + config DISCONTIGMEM def_bool y depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) || DISCONTIGMEM_MANUAL diff --git a/mm/Makefile b/mm/Makefile index d072cadb4299..d1a819711e9f 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -62,6 +62,7 @@ CFLAGS_page_alloc.o += -DDYNAMIC_DEBUG_MODULE obj-y += page-alloc.o obj-y += init-mm.o obj-y += memblock.o +obj-$(CONFIG_MEMBLOCK_DEBUGFS) += memblock_debugfs.o ifdef CONFIG_MMU obj-$(CONFIG_ADVISE_SYSCALLS) += madvise.o diff --git a/mm/memblock_debugfs.c b/mm/memblock_debugfs.c new file mode 100644 index 000000000000..4ee5d1de4add --- /dev/null +++ b/mm/memblock_debugfs.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Debugfs for reserved memory blocks. + * + * Copyright (C) 2022 Rockchip Electronics Co. Ltd. + */ + +#include +#include +#include +#include + +#define K(size) ((unsigned long)((size) >> 10)) + +static int memblock_debugfs_show(struct seq_file *m, void *private) +{ + struct memblock_type *type = m->private; + struct memblock_region *reg; + int i; + phys_addr_t end; + unsigned long z = 0, t = 0; + + for (i = 0; i < type->cnt; i++) { + reg = &type->regions[i]; + end = reg->base + reg->size - 1; + z = (unsigned long)reg->size; + t += z; + + seq_printf(m, "%4d: ", i); + seq_printf(m, "%pa..%pa (%10lu %s)\n", ®->base, &end, + (z >= 1024) ? (K(z)) : z, + (z >= 1024) ? "KiB" : "Bytes"); + } + seq_printf(m, "Total: %lu KiB\n", K(t)); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(memblock_debugfs); + +static int __init memblock_debugfs_init(void) +{ + struct dentry *root = debugfs_lookup("memblock", NULL); + + if (!root) + return -EPROBE_DEFER; + + debugfs_create_file("reserved_size", 0444, root, + &memblock.reserved, &memblock_debugfs_fops); + + return 0; +} +late_initcall(memblock_debugfs_init);