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mm/memtest.c
2.78 KB
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// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/memblock.h> |
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static u64 patterns[] __initdata = { |
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/* The first entry has to be 0 to leave memtest with zeroed memory */ |
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0, 0xffffffffffffffffULL, 0x5555555555555555ULL, 0xaaaaaaaaaaaaaaaaULL, |
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0x1111111111111111ULL, 0x2222222222222222ULL, 0x4444444444444444ULL, 0x8888888888888888ULL, 0x3333333333333333ULL, 0x6666666666666666ULL, 0x9999999999999999ULL, 0xccccccccccccccccULL, 0x7777777777777777ULL, 0xbbbbbbbbbbbbbbbbULL, 0xddddddddddddddddULL, 0xeeeeeeeeeeeeeeeeULL, 0x7a6c7258554e494cULL, /* yeah ;-) */ |
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}; |
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static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad) |
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{ |
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pr_info(" %016llx bad mem addr %pa - %pa reserved ", cpu_to_be64(pattern), &start_bad, &end_bad); |
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memblock_reserve(start_bad, end_bad - start_bad); |
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} |
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static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size) |
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{ |
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u64 *p, *start, *end; |
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phys_addr_t start_bad, last_bad; phys_addr_t start_phys_aligned; |
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const size_t incr = sizeof(pattern); |
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start_phys_aligned = ALIGN(start_phys, incr); |
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start = __va(start_phys_aligned); |
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end = start + (size - (start_phys_aligned - start_phys)) / incr; |
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start_bad = 0; last_bad = 0; |
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for (p = start; p < end; p++) *p = pattern; |
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for (p = start; p < end; p++, start_phys_aligned += incr) { if (*p == pattern) |
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continue; if (start_phys_aligned == last_bad + incr) { last_bad += incr; continue; |
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} |
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if (start_bad) reserve_bad_mem(pattern, start_bad, last_bad + incr); start_bad = last_bad = start_phys_aligned; |
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} |
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if (start_bad) reserve_bad_mem(pattern, start_bad, last_bad + incr); |
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} |
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static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end) |
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{ |
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u64 i; phys_addr_t this_start, this_end; |
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for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start, &this_end, NULL) { |
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this_start = clamp(this_start, start, end); this_end = clamp(this_end, start, end); |
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if (this_start < this_end) { |
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pr_info(" %pa - %pa pattern %016llx ", &this_start, &this_end, cpu_to_be64(pattern)); |
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memtest(pattern, this_start, this_end - this_start); } |
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} } |
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/* default is disabled */ |
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static unsigned int memtest_pattern __initdata; |
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static int __init parse_memtest(char *arg) { |
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int ret = 0; |
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if (arg) |
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ret = kstrtouint(arg, 0, &memtest_pattern); |
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else memtest_pattern = ARRAY_SIZE(patterns); |
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return ret; |
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} early_param("memtest", parse_memtest); |
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void __init early_memtest(phys_addr_t start, phys_addr_t end) |
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{ |
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unsigned int i; |
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unsigned int idx = 0; |
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if (!memtest_pattern) return; |
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pr_info("early_memtest: # of tests: %u ", memtest_pattern); |
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for (i = memtest_pattern-1; i < UINT_MAX; --i) { |
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idx = i % ARRAY_SIZE(patterns); do_one_pass(patterns[idx], start, end); } |
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} |