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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1f067167 | 2 | #include <linux/kernel.h> |
1f067167 | 3 | #include <linux/types.h> |
1f067167 | 4 | #include <linux/init.h> |
a9ce6bc1 | 5 | #include <linux/memblock.h> |
1f067167 | 6 | |
bd23024b TM |
7 | bool early_memtest_done; |
8 | phys_addr_t early_memtest_bad_size; | |
9 | ||
6d74171b | 10 | static u64 patterns[] __initdata = { |
20bf062c | 11 | /* The first entry has to be 0 to leave memtest with zeroed memory */ |
6d74171b AH |
12 | 0, |
13 | 0xffffffffffffffffULL, | |
14 | 0x5555555555555555ULL, | |
15 | 0xaaaaaaaaaaaaaaaaULL, | |
63823126 AH |
16 | 0x1111111111111111ULL, |
17 | 0x2222222222222222ULL, | |
18 | 0x4444444444444444ULL, | |
19 | 0x8888888888888888ULL, | |
20 | 0x3333333333333333ULL, | |
21 | 0x6666666666666666ULL, | |
22 | 0x9999999999999999ULL, | |
23 | 0xccccccccccccccccULL, | |
24 | 0x7777777777777777ULL, | |
25 | 0xbbbbbbbbbbbbbbbbULL, | |
26 | 0xddddddddddddddddULL, | |
27 | 0xeeeeeeeeeeeeeeeeULL, | |
28 | 0x7a6c7258554e494cULL, /* yeah ;-) */ | |
6d74171b | 29 | }; |
40823f73 | 30 | |
7f70baee | 31 | static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad) |
7dad169e | 32 | { |
f373bafc VM |
33 | pr_info(" %016llx bad mem addr %pa - %pa reserved\n", |
34 | cpu_to_be64(pattern), &start_bad, &end_bad); | |
24aa0788 | 35 | memblock_reserve(start_bad, end_bad - start_bad); |
bd23024b | 36 | early_memtest_bad_size += (end_bad - start_bad); |
7dad169e AH |
37 | } |
38 | ||
7f70baee | 39 | static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size) |
1f067167 | 40 | { |
9866b7e8 | 41 | u64 *p, *start, *end; |
7f70baee VM |
42 | phys_addr_t start_bad, last_bad; |
43 | phys_addr_t start_phys_aligned; | |
9866b7e8 | 44 | const size_t incr = sizeof(pattern); |
1f067167 | 45 | |
1f067167 | 46 | start_phys_aligned = ALIGN(start_phys, incr); |
1f067167 | 47 | start = __va(start_phys_aligned); |
9866b7e8 | 48 | end = start + (size - (start_phys_aligned - start_phys)) / incr; |
1f067167 YL |
49 | start_bad = 0; |
50 | last_bad = 0; | |
51 | ||
c9690998 AH |
52 | for (p = start; p < end; p++) |
53 | *p = pattern; | |
9866b7e8 | 54 | |
c9690998 AH |
55 | for (p = start; p < end; p++, start_phys_aligned += incr) { |
56 | if (*p == pattern) | |
7dad169e AH |
57 | continue; |
58 | if (start_phys_aligned == last_bad + incr) { | |
59 | last_bad += incr; | |
60 | continue; | |
1f067167 | 61 | } |
7dad169e AH |
62 | if (start_bad) |
63 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
64 | start_bad = last_bad = start_phys_aligned; | |
1f067167 | 65 | } |
7dad169e AH |
66 | if (start_bad) |
67 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
bd23024b TM |
68 | |
69 | early_memtest_done = true; | |
1f067167 YL |
70 | } |
71 | ||
7f70baee | 72 | static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end) |
bfb4dc0d | 73 | { |
8d89ac80 TH |
74 | u64 i; |
75 | phys_addr_t this_start, this_end; | |
76 | ||
fc6daaf9 TL |
77 | for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start, |
78 | &this_end, NULL) { | |
7f70baee VM |
79 | this_start = clamp(this_start, start, end); |
80 | this_end = clamp(this_end, start, end); | |
8d89ac80 | 81 | if (this_start < this_end) { |
f373bafc VM |
82 | pr_info(" %pa - %pa pattern %016llx\n", |
83 | &this_start, &this_end, cpu_to_be64(pattern)); | |
8d89ac80 TH |
84 | memtest(pattern, this_start, this_end - this_start); |
85 | } | |
bfb4dc0d AH |
86 | } |
87 | } | |
88 | ||
1f067167 | 89 | /* default is disabled */ |
06f80596 | 90 | static unsigned int memtest_pattern __initdata; |
1f067167 YL |
91 | |
92 | static int __init parse_memtest(char *arg) | |
93 | { | |
06f80596 VM |
94 | int ret = 0; |
95 | ||
1f067167 | 96 | if (arg) |
06f80596 | 97 | ret = kstrtouint(arg, 0, &memtest_pattern); |
d1a8e779 YL |
98 | else |
99 | memtest_pattern = ARRAY_SIZE(patterns); | |
100 | ||
06f80596 | 101 | return ret; |
1f067167 YL |
102 | } |
103 | ||
104 | early_param("memtest", parse_memtest); | |
105 | ||
7f70baee | 106 | void __init early_memtest(phys_addr_t start, phys_addr_t end) |
1f067167 | 107 | { |
6d74171b | 108 | unsigned int i; |
bfb4dc0d | 109 | unsigned int idx = 0; |
1f067167 YL |
110 | |
111 | if (!memtest_pattern) | |
112 | return; | |
113 | ||
f373bafc | 114 | pr_info("early_memtest: # of tests: %u\n", memtest_pattern); |
20bf062c | 115 | for (i = memtest_pattern-1; i < UINT_MAX; --i) { |
bfb4dc0d AH |
116 | idx = i % ARRAY_SIZE(patterns); |
117 | do_one_pass(patterns[idx], start, end); | |
118 | } | |
1f067167 | 119 | } |