Currently the memtest results were only presented in dmesg.
This adds /proc/meminfo entry which can be easily used by scripts.
Signed-off-by: Tomas Mudrunka <tomas.mudrunka@xxxxxxxxx>
---
Documentation/filesystems/proc.rst | 8 ++++++++
fs/proc/meminfo.c | 13 +++++++++++++
include/linux/memblock.h | 2 ++
mm/memtest.c | 6 ++++++
4 files changed, 29 insertions(+)
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 9d5fd9424..8740362f3 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -996,6 +996,7 @@ Example output. You may not have all of these fields.
VmallocUsed: 40444 kB
VmallocChunk: 0 kB
Percpu: 29312 kB
+ EarlyMemtestBad: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 4149248 kB
ShmemHugePages: 0 kB
@@ -1146,6 +1147,13 @@ VmallocChunk
Percpu
Memory allocated to the percpu allocator used to back percpu
allocations. This stat excludes the cost of metadata.
+EarlyMemtestBad
+ The amount of RAM/memory in kB, that was identified as corrupted
+ by early memtest. If memtest was not run, this field will not
+ be displayed at all. Size is never rounded down to 0 kB.
+ That means if 0 kB is reported, you can safely assume
+ there was at least one pass of memtest and none of the passes
+ found a single faulty byte of RAM.
HardwareCorrupted
The amount of RAM/memory in KB, the kernel identifies as
corrupted.
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 440960110..b43d0bd42 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -6,6 +6,7 @@
#include <linux/hugetlb.h>
#include <linux/mman.h>
#include <linux/mmzone.h>
+#include <linux/memblock.h>
#include <linux/proc_fs.h>
#include <linux/percpu.h>
#include <linux/seq_file.h>
@@ -131,6 +132,18 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
show_val_kb(m, "VmallocChunk: ", 0ul);
show_val_kb(m, "Percpu: ", pcpu_nr_pages());
+#ifdef CONFIG_MEMTEST
+ if (early_memtest_done) {
+ unsigned long early_memtest_bad_size_kb;
+
+ early_memtest_bad_size_kb = early_memtest_bad_size>>10;
+ if (early_memtest_bad_size && !early_memtest_bad_size_kb)
+ early_memtest_bad_size_kb = 1;
+ /* When 0 is reported, it means there actually was a successful test */
+ seq_printf(m, "EarlyMemtestBad: %5lu kB\n", early_memtest_bad_size_kb);
+ }
+#endif
+
#ifdef CONFIG_MEMORY_FAILURE
seq_printf(m, "HardwareCorrupted: %5lu kB\n",
atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 50ad19662..f82ee3fac 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -597,6 +597,8 @@ extern int hashdist; /* Distribute hashes across NUMA nodes? */
#endif
#ifdef CONFIG_MEMTEST
+extern phys_addr_t early_memtest_bad_size; /* Size of faulty ram found by memtest */
+extern bool early_memtest_done; /* Was early memtest done? */
extern void early_memtest(phys_addr_t start, phys_addr_t end);
#else
static inline void early_memtest(phys_addr_t start, phys_addr_t end)
diff --git a/mm/memtest.c b/mm/memtest.c
index f53ace709..57149dfee 100644
--- a/mm/memtest.c
+++ b/mm/memtest.c
@@ -4,6 +4,9 @@
#include <linux/init.h>
#include <linux/memblock.h>
+bool early_memtest_done;
+phys_addr_t early_memtest_bad_size;
+
static u64 patterns[] __initdata = {
/* The first entry has to be 0 to leave memtest with zeroed memory */
0,
@@ -30,6 +33,7 @@ static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr
pr_info(" %016llx bad mem addr %pa - %pa reserved\n",
cpu_to_be64(pattern), &start_bad, &end_bad);
memblock_reserve(start_bad, end_bad - start_bad);
+ early_memtest_bad_size += (end_bad - start_bad);
}
static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size)
@@ -61,6 +65,8 @@ static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size
}
if (start_bad)
reserve_bad_mem(pattern, start_bad, last_bad + incr);
+
+ early_memtest_done = true;
}
static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end)
--
2.40.0
