102 lines
4.3 KiB
Diff
102 lines
4.3 KiB
Diff
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From 0b5435e10161345cf713ed447a155a611a1b408b Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Wed, 26 May 2021 17:33:13 +0900
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Subject: [PATCH 1/2] memory: Add support for SECTION_TAINT_ZONE_DEVICE flag
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Fix for "kmem -n|-p" options on Linux 5.12-rc1 and later kernels
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that contain commit 1f90a3477df3f ("mm: teach pfn_to_online_page()
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about ZONE_DEVICE section collisions"). Without the patch, the
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"kmem -n" option incorrectly shows mem_map addresses containing the
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flag in bit 5 as part of the virtual address, and also the "kmem -p"
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option shows page structures at wrong position. With the patch,
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the "kmem -n" option displays the new "D" state flag.
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Without the patch:
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crash> kmem -n
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...
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NR SECTION CODED_MEM_MAP MEM_MAP STATE PFN
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1040 ffff9edf3ffd4100 ffffe2bcc0000010 ffffe2bd42000010 PMOE 34078720
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^ ^
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crash> kmem -p
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffe2bd42000010 2080000000 400040 1ffffffff 9961471 dead000000000122 referenced,active,error
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ffffe2bd42000050 2080001000 800080 1ffffffff 9961471 dead000000000122 referenced,active,error
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ffffe2bd42000090 2080002000 0 1ffffffff 9961471 dead000000000122 referenced,active,error
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^^
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With the patch:
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crash> kmem -n
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...
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NR SECTION CODED_MEM_MAP MEM_MAP STATE PFN
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1040 ffff9edf3ffd4100 ffffe2bcc0000000 ffffe2bd42000000 PMOED 34078720
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crash> kmem -p
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffe2bd42000000 2080000000 ffff9ebfc0044100 0 1 97ffffc0000200 slab
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ffffe2bd42000040 2080001000 ffff9ebfc0044400 0 1 97ffffc0000200 slab
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ffffe2bd42000080 2080002000 0 0 1 97ffffc0000000
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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help.c | 11 +++++++----
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memory.c | 15 +++++++++------
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2 files changed, 16 insertions(+), 10 deletions(-)
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diff --git a/help.c b/help.c
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index e0c84087add3..9649cc81fa36 100644
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--- a/help.c
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+++ b/help.c
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@@ -6584,10 +6584,13 @@ char *help_kmem[] = {
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" kernels, the vm_zone_stat, vm_node_stat and vm_numa_stat tables,",
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" the cumulative page_states counter values if they exist, and/or ",
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" the cumulative, vm_event_states counter values if they exist.",
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-" -n display memory node, memory section, and memory block data",
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-" and state; the state of each memory section state is encoded",
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-" as \"P\", \"M\", \"O\" and/or \"E\", meaning SECTION_MARKED_PRESENT,",
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-" SECTION_HAS_MEM_MAP, SECTION_IS_ONLINE and SECTION_IS_EARLY.",
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+" -n display memory node, memory section, memory block data and state;",
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+" the state of each memory section is shown as the following flags:",
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+" \"P\": SECTION_MARKED_PRESENT",
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+" \"M\": SECTION_HAS_MEM_MAP",
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+" \"O\": SECTION_IS_ONLINE",
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+" \"E\": SECTION_IS_EARLY",
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+" \"D\": SECTION_TAINT_ZONE_DEVICE",
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" -z displays per-zone memory statistics.",
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" -o displays each cpu's offset value that is added to per-cpu symbol",
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" values to translate them into kernel virtual addresses.",
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diff --git a/memory.c b/memory.c
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index a3cf8a86728d..2c4f9790f498 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -17270,12 +17270,13 @@ nr_to_section(ulong nr)
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* which results in PFN_SECTION_SHIFT equal 6.
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* To sum it up, at least 6 bits are available.
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*/
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-#define SECTION_MARKED_PRESENT (1UL<<0)
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-#define SECTION_HAS_MEM_MAP (1UL<<1)
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-#define SECTION_IS_ONLINE (1UL<<2)
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-#define SECTION_IS_EARLY (1UL<<3)
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-#define SECTION_MAP_LAST_BIT (1UL<<4)
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-#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
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+#define SECTION_MARKED_PRESENT (1UL<<0)
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+#define SECTION_HAS_MEM_MAP (1UL<<1)
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+#define SECTION_IS_ONLINE (1UL<<2)
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+#define SECTION_IS_EARLY (1UL<<3)
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+#define SECTION_TAINT_ZONE_DEVICE (1UL<<4)
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+#define SECTION_MAP_LAST_BIT (1UL<<5)
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+#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
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int
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@@ -17373,6 +17374,8 @@ fill_mem_section_state(ulong state, char *buf)
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bufidx += sprintf(buf + bufidx, "%s", "O");
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if (state & SECTION_IS_EARLY)
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bufidx += sprintf(buf + bufidx, "%s", "E");
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+ if (state & SECTION_TAINT_ZONE_DEVICE)
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+ bufidx += sprintf(buf + bufidx, "%s", "D");
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}
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void
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--
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2.30.2
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