blob: 8eaa4c3a5f65a86bd3f465455960b573b9434273
1 | #include <linux/kernel.h> |
2 | #include <linux/types.h> |
3 | #include <linux/init.h> |
4 | #include <linux/memblock.h> |
5 | |
6 | static u64 patterns[] __initdata = { |
7 | /* The first entry has to be 0 to leave memtest with zeroed memory */ |
8 | 0, |
9 | 0xffffffffffffffffULL, |
10 | 0x5555555555555555ULL, |
11 | 0xaaaaaaaaaaaaaaaaULL, |
12 | 0x1111111111111111ULL, |
13 | 0x2222222222222222ULL, |
14 | 0x4444444444444444ULL, |
15 | 0x8888888888888888ULL, |
16 | 0x3333333333333333ULL, |
17 | 0x6666666666666666ULL, |
18 | 0x9999999999999999ULL, |
19 | 0xccccccccccccccccULL, |
20 | 0x7777777777777777ULL, |
21 | 0xbbbbbbbbbbbbbbbbULL, |
22 | 0xddddddddddddddddULL, |
23 | 0xeeeeeeeeeeeeeeeeULL, |
24 | 0x7a6c7258554e494cULL, /* yeah ;-) */ |
25 | }; |
26 | |
27 | static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad) |
28 | { |
29 | pr_info(" %016llx bad mem addr %pa - %pa reserved\n", |
30 | cpu_to_be64(pattern), &start_bad, &end_bad); |
31 | memblock_reserve(start_bad, end_bad - start_bad); |
32 | } |
33 | |
34 | static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size) |
35 | { |
36 | u64 *p, *start, *end; |
37 | phys_addr_t start_bad, last_bad; |
38 | phys_addr_t start_phys_aligned; |
39 | const size_t incr = sizeof(pattern); |
40 | |
41 | start_phys_aligned = ALIGN(start_phys, incr); |
42 | start = __va(start_phys_aligned); |
43 | end = start + (size - (start_phys_aligned - start_phys)) / incr; |
44 | start_bad = 0; |
45 | last_bad = 0; |
46 | |
47 | for (p = start; p < end; p++) |
48 | *p = pattern; |
49 | |
50 | for (p = start; p < end; p++, start_phys_aligned += incr) { |
51 | if (*p == pattern) |
52 | continue; |
53 | if (start_phys_aligned == last_bad + incr) { |
54 | last_bad += incr; |
55 | continue; |
56 | } |
57 | if (start_bad) |
58 | reserve_bad_mem(pattern, start_bad, last_bad + incr); |
59 | start_bad = last_bad = start_phys_aligned; |
60 | } |
61 | if (start_bad) |
62 | reserve_bad_mem(pattern, start_bad, last_bad + incr); |
63 | } |
64 | |
65 | static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end) |
66 | { |
67 | u64 i; |
68 | phys_addr_t this_start, this_end; |
69 | |
70 | for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start, |
71 | &this_end, NULL) { |
72 | this_start = clamp(this_start, start, end); |
73 | this_end = clamp(this_end, start, end); |
74 | if (this_start < this_end) { |
75 | pr_info(" %pa - %pa pattern %016llx\n", |
76 | &this_start, &this_end, cpu_to_be64(pattern)); |
77 | memtest(pattern, this_start, this_end - this_start); |
78 | } |
79 | } |
80 | } |
81 | |
82 | /* default is disabled */ |
83 | static unsigned int memtest_pattern __initdata; |
84 | |
85 | static int __init parse_memtest(char *arg) |
86 | { |
87 | int ret = 0; |
88 | |
89 | if (arg) |
90 | ret = kstrtouint(arg, 0, &memtest_pattern); |
91 | else |
92 | memtest_pattern = ARRAY_SIZE(patterns); |
93 | |
94 | return ret; |
95 | } |
96 | |
97 | early_param("memtest", parse_memtest); |
98 | |
99 | void __init early_memtest(phys_addr_t start, phys_addr_t end) |
100 | { |
101 | unsigned int i; |
102 | unsigned int idx = 0; |
103 | |
104 | if (!memtest_pattern) |
105 | return; |
106 | |
107 | pr_info("early_memtest: # of tests: %u\n", memtest_pattern); |
108 | for (i = memtest_pattern-1; i < UINT_MAX; --i) { |
109 | idx = i % ARRAY_SIZE(patterns); |
110 | do_one_pass(patterns[idx], start, end); |
111 | } |
112 | } |
113 |