From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- mm/memtest.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 mm/memtest.c (limited to 'mm/memtest.c') diff --git a/mm/memtest.c b/mm/memtest.c new file mode 100644 index 000000000..f53ace709 --- /dev/null +++ b/mm/memtest.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include + +static u64 patterns[] __initdata = { + /* The first entry has to be 0 to leave memtest with zeroed memory */ + 0, + 0xffffffffffffffffULL, + 0x5555555555555555ULL, + 0xaaaaaaaaaaaaaaaaULL, + 0x1111111111111111ULL, + 0x2222222222222222ULL, + 0x4444444444444444ULL, + 0x8888888888888888ULL, + 0x3333333333333333ULL, + 0x6666666666666666ULL, + 0x9999999999999999ULL, + 0xccccccccccccccccULL, + 0x7777777777777777ULL, + 0xbbbbbbbbbbbbbbbbULL, + 0xddddddddddddddddULL, + 0xeeeeeeeeeeeeeeeeULL, + 0x7a6c7258554e494cULL, /* yeah ;-) */ +}; + +static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad) +{ + 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); +} + +static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size) +{ + u64 *p, *start, *end; + phys_addr_t start_bad, last_bad; + phys_addr_t start_phys_aligned; + const size_t incr = sizeof(pattern); + + start_phys_aligned = ALIGN(start_phys, incr); + start = __va(start_phys_aligned); + end = start + (size - (start_phys_aligned - start_phys)) / incr; + start_bad = 0; + last_bad = 0; + + for (p = start; p < end; p++) + *p = pattern; + + for (p = start; p < end; p++, start_phys_aligned += incr) { + if (*p == pattern) + continue; + if (start_phys_aligned == last_bad + incr) { + last_bad += incr; + continue; + } + if (start_bad) + reserve_bad_mem(pattern, start_bad, last_bad + incr); + start_bad = last_bad = start_phys_aligned; + } + if (start_bad) + reserve_bad_mem(pattern, start_bad, last_bad + incr); +} + +static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end) +{ + u64 i; + phys_addr_t this_start, this_end; + + for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start, + &this_end, NULL) { + this_start = clamp(this_start, start, end); + this_end = clamp(this_end, start, end); + if (this_start < this_end) { + pr_info(" %pa - %pa pattern %016llx\n", + &this_start, &this_end, cpu_to_be64(pattern)); + memtest(pattern, this_start, this_end - this_start); + } + } +} + +/* default is disabled */ +static unsigned int memtest_pattern __initdata; + +static int __init parse_memtest(char *arg) +{ + int ret = 0; + + if (arg) + ret = kstrtouint(arg, 0, &memtest_pattern); + else + memtest_pattern = ARRAY_SIZE(patterns); + + return ret; +} + +early_param("memtest", parse_memtest); + +void __init early_memtest(phys_addr_t start, phys_addr_t end) +{ + unsigned int i; + unsigned int idx = 0; + + if (!memtest_pattern) + return; + + pr_info("early_memtest: # of tests: %u\n", memtest_pattern); + for (i = memtest_pattern-1; i < UINT_MAX; --i) { + idx = i % ARRAY_SIZE(patterns); + do_one_pass(patterns[idx], start, end); + } +} -- cgit v1.2.3