linux-kernel - [PATCH v3] memblock: Add flags and nid info in memblock debugfs

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Message-Id: <20230518091431.299-1-ssawgyw@gmail.com>
Date:   Thu, 18 May 2023 17:14:31 +0800
From:   Yuwei Guan <ssawgyw@...il.com>
To:     rppt@...nel.org, akpm@...ux-foundation.org, tsahu@...ux.ibm.com,
        anshuman.khandual@....com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Yuwei Guan <ssawgyw@...il.com>
Subject: [PATCH v3] memblock: Add flags and nid info in memblock debugfs

Currently, the memblock debugfs can display the count of memblock_type and
the base and end of the reg. However, when memblock_mark_*() or
memblock_set_node() is executed on some range, the information in the
existing debugfs cannot make it clear why the address is not consecutive.

For example,
cat /sys/kernel/debug/memblock/memory
   0: 0x0000000080000000..0x00000000901fffff
   1: 0x0000000090200000..0x00000000905fffff
   2: 0x0000000090600000..0x0000000092ffffff
   3: 0x0000000093000000..0x00000000973fffff
   4: 0x0000000097400000..0x00000000b71fffff
   5: 0x00000000c0000000..0x00000000dfffffff
   6: 0x00000000e2500000..0x00000000f87fffff
   7: 0x00000000f8800000..0x00000000fa7fffff
   8: 0x00000000fa800000..0x00000000fd3effff
   9: 0x00000000fd3f0000..0x00000000fd3fefff
  10: 0x00000000fd3ff000..0x00000000fd7fffff
  11: 0x00000000fd800000..0x00000000fd901fff
  12: 0x00000000fd902000..0x00000000fd909fff
  13: 0x00000000fd90a000..0x00000000fd90bfff
  14: 0x00000000fd90c000..0x00000000ffffffff
  15: 0x0000000880000000..0x0000000affffffff

So we can add flags and nid to this debugfs.

For example,
cat /sys/kernel/debug/memblock/memory
   0: 0x0000000080000000..0x00000000901fffff     NONE    0
   1: 0x0000000090200000..0x00000000905fffff    NOMAP    0
   2: 0x0000000090600000..0x0000000092ffffff     NONE    0
   3: 0x0000000093000000..0x00000000973fffff    NOMAP    0
   4: 0x0000000097400000..0x00000000b71fffff     NONE    0
   5: 0x00000000c0000000..0x00000000dfffffff     NONE    0
   6: 0x00000000e2500000..0x00000000f87fffff     NONE    0
   7: 0x00000000f8800000..0x00000000fa7fffff    NOMAP    0
   8: 0x00000000fa800000..0x00000000fd3effff     NONE    0
   9: 0x00000000fd3f0000..0x00000000fd3fefff    NOMAP    0
  10: 0x00000000fd3ff000..0x00000000fd7fffff     NONE    0
  11: 0x00000000fd800000..0x00000000fd901fff    NOMAP    0
  12: 0x00000000fd902000..0x00000000fd909fff     NONE    0
  13: 0x00000000fd90a000..0x00000000fd90bfff    NOMAP    0
  14: 0x00000000fd90c000..0x00000000ffffffff     NONE    0
  15: 0x0000000880000000..0x0000000affffffff     NONE    0

Signed-off-by: Yuwei Guan <ssawgyw@...il.com>
---
v3:
- show string value for each memblock flag
---
 mm/memblock.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 511d4783dcf1..5fba53f98b2d 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -2143,13 +2143,23 @@ static int memblock_debug_show(struct seq_file *m, void *private)
 	struct memblock_region *reg;
 	int i;
 	phys_addr_t end;
+	static const char flagname[BITS_PER_LONG][8] = {
+		[0 ... (BITS_PER_LONG-1)] = "?",
+
+		[ilog2(MEMBLOCK_HOTPLUG)] = "HOTPLUG",
+		[ilog2(MEMBLOCK_MIRROR)] = "MIRROR",
+		[ilog2(MEMBLOCK_NOMAP)] = "NOMAP",
+		[ilog2(MEMBLOCK_DRIVER_MANAGED)] = "DRV_MNG",
+	};
 
 	for (i = 0; i < type->cnt; i++) {
 		reg = &type->regions[i];
 		end = reg->base + reg->size - 1;
 
 		seq_printf(m, "%4d: ", i);
-		seq_printf(m, "%pa..%pa\n", &reg->base, &end);
+		seq_printf(m, "%pa..%pa ", &reg->base, &end);
+		seq_printf(m, "%8s ", reg->flags ? flagname[ilog2(reg->flags)] : "NONE");
+		seq_printf(m, "%4d\n", memblock_get_region_node(reg));
 	}
 	return 0;
 }
-- 
2.34.1