1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/kernel.h>
3*4882a593Smuzhiyun #include <linux/types.h>
4*4882a593Smuzhiyun #include <linux/init.h>
5*4882a593Smuzhiyun #include <linux/memblock.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun static u64 patterns[] __initdata = {
8*4882a593Smuzhiyun /* The first entry has to be 0 to leave memtest with zeroed memory */
9*4882a593Smuzhiyun 0,
10*4882a593Smuzhiyun 0xffffffffffffffffULL,
11*4882a593Smuzhiyun 0x5555555555555555ULL,
12*4882a593Smuzhiyun 0xaaaaaaaaaaaaaaaaULL,
13*4882a593Smuzhiyun 0x1111111111111111ULL,
14*4882a593Smuzhiyun 0x2222222222222222ULL,
15*4882a593Smuzhiyun 0x4444444444444444ULL,
16*4882a593Smuzhiyun 0x8888888888888888ULL,
17*4882a593Smuzhiyun 0x3333333333333333ULL,
18*4882a593Smuzhiyun 0x6666666666666666ULL,
19*4882a593Smuzhiyun 0x9999999999999999ULL,
20*4882a593Smuzhiyun 0xccccccccccccccccULL,
21*4882a593Smuzhiyun 0x7777777777777777ULL,
22*4882a593Smuzhiyun 0xbbbbbbbbbbbbbbbbULL,
23*4882a593Smuzhiyun 0xddddddddddddddddULL,
24*4882a593Smuzhiyun 0xeeeeeeeeeeeeeeeeULL,
25*4882a593Smuzhiyun 0x7a6c7258554e494cULL, /* yeah ;-) */
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
reserve_bad_mem(u64 pattern,phys_addr_t start_bad,phys_addr_t end_bad)28*4882a593Smuzhiyun static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun pr_info(" %016llx bad mem addr %pa - %pa reserved\n",
31*4882a593Smuzhiyun cpu_to_be64(pattern), &start_bad, &end_bad);
32*4882a593Smuzhiyun memblock_reserve(start_bad, end_bad - start_bad);
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
memtest(u64 pattern,phys_addr_t start_phys,phys_addr_t size)35*4882a593Smuzhiyun static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun u64 *p, *start, *end;
38*4882a593Smuzhiyun phys_addr_t start_bad, last_bad;
39*4882a593Smuzhiyun phys_addr_t start_phys_aligned;
40*4882a593Smuzhiyun const size_t incr = sizeof(pattern);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun start_phys_aligned = ALIGN(start_phys, incr);
43*4882a593Smuzhiyun start = __va(start_phys_aligned);
44*4882a593Smuzhiyun end = start + (size - (start_phys_aligned - start_phys)) / incr;
45*4882a593Smuzhiyun start_bad = 0;
46*4882a593Smuzhiyun last_bad = 0;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun for (p = start; p < end; p++)
49*4882a593Smuzhiyun *p = pattern;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun for (p = start; p < end; p++, start_phys_aligned += incr) {
52*4882a593Smuzhiyun if (*p == pattern)
53*4882a593Smuzhiyun continue;
54*4882a593Smuzhiyun if (start_phys_aligned == last_bad + incr) {
55*4882a593Smuzhiyun last_bad += incr;
56*4882a593Smuzhiyun continue;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun if (start_bad)
59*4882a593Smuzhiyun reserve_bad_mem(pattern, start_bad, last_bad + incr);
60*4882a593Smuzhiyun start_bad = last_bad = start_phys_aligned;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun if (start_bad)
63*4882a593Smuzhiyun reserve_bad_mem(pattern, start_bad, last_bad + incr);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
do_one_pass(u64 pattern,phys_addr_t start,phys_addr_t end)66*4882a593Smuzhiyun static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun u64 i;
69*4882a593Smuzhiyun phys_addr_t this_start, this_end;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start,
72*4882a593Smuzhiyun &this_end, NULL) {
73*4882a593Smuzhiyun this_start = clamp(this_start, start, end);
74*4882a593Smuzhiyun this_end = clamp(this_end, start, end);
75*4882a593Smuzhiyun if (this_start < this_end) {
76*4882a593Smuzhiyun pr_info(" %pa - %pa pattern %016llx\n",
77*4882a593Smuzhiyun &this_start, &this_end, cpu_to_be64(pattern));
78*4882a593Smuzhiyun memtest(pattern, this_start, this_end - this_start);
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun /* default is disabled */
84*4882a593Smuzhiyun static unsigned int memtest_pattern __initdata;
85*4882a593Smuzhiyun
parse_memtest(char * arg)86*4882a593Smuzhiyun static int __init parse_memtest(char *arg)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun int ret = 0;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun if (arg)
91*4882a593Smuzhiyun ret = kstrtouint(arg, 0, &memtest_pattern);
92*4882a593Smuzhiyun else
93*4882a593Smuzhiyun memtest_pattern = ARRAY_SIZE(patterns);
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun return ret;
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun early_param("memtest", parse_memtest);
99*4882a593Smuzhiyun
early_memtest(phys_addr_t start,phys_addr_t end)100*4882a593Smuzhiyun void __init early_memtest(phys_addr_t start, phys_addr_t end)
101*4882a593Smuzhiyun {
102*4882a593Smuzhiyun unsigned int i;
103*4882a593Smuzhiyun unsigned int idx = 0;
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun if (!memtest_pattern)
106*4882a593Smuzhiyun return;
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun pr_info("early_memtest: # of tests: %u\n", memtest_pattern);
109*4882a593Smuzhiyun for (i = memtest_pattern-1; i < UINT_MAX; --i) {
110*4882a593Smuzhiyun idx = i % ARRAY_SIZE(patterns);
111*4882a593Smuzhiyun do_one_pass(patterns[idx], start, end);
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun }
114