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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140// SPDX-License-Identifier: GPL-2.0#include <linux/kernel.h>#include <linux/types.h>#include <linux/init.h>#include <linux/memblock.h>#include <linux/seq_file.h>
static bool early_memtest_done;static 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, 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); early_memtest_bad_size += (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;
VM_WARN_ON_ONCE(size < start_phys_aligned - start_phys);
for (p = start; p < end; p++) WRITE_ONCE(*p, pattern);
for (p = start; p < end; p++, start_phys_aligned += incr) { if (READ_ONCE(*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);
early_memtest_done = true;}
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); }}
void memtest_report_meminfo(struct seq_file *m){ unsigned long early_memtest_bad_size_kb;
if (!IS_ENABLED(CONFIG_PROC_FS)) return;
if (!early_memtest_done) return;
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);}