blob: 8eaa4c3a5f65a86bd3f465455960b573b9434273 [file] [log] [blame]
Yinghai Lu1f067162008-07-15 00:02:28 -07001#include <linux/kernel.h>
Yinghai Lu1f067162008-07-15 00:02:28 -07002#include <linux/types.h>
Yinghai Lu1f067162008-07-15 00:02:28 -07003#include <linux/init.h>
Yinghai Lua9ce6bc2010-08-25 13:39:17 -07004#include <linux/memblock.h>
Yinghai Lu1f067162008-07-15 00:02:28 -07005
Andreas Herrmann6d741712009-02-25 11:27:27 +01006static u64 patterns[] __initdata = {
Alexander Holler20bf0622013-02-16 16:38:17 +01007 /* The first entry has to be 0 to leave memtest with zeroed memory */
Andreas Herrmann6d741712009-02-25 11:27:27 +01008 0,
9 0xffffffffffffffffULL,
10 0x5555555555555555ULL,
11 0xaaaaaaaaaaaaaaaaULL,
Andreas Herrmann63823122009-02-25 11:31:49 +010012 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 ;-) */
Andreas Herrmann6d741712009-02-25 11:27:27 +010025};
Andreas Herrmann40823f72009-02-25 11:26:18 +010026
Vladimir Murzin7f70bae2015-04-14 15:48:30 -070027static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad)
Andreas Herrmann7dad169e2009-02-25 11:28:07 +010028{
Vladimir Murzinf373baf2015-09-08 15:00:19 -070029 pr_info(" %016llx bad mem addr %pa - %pa reserved\n",
30 cpu_to_be64(pattern), &start_bad, &end_bad);
Tejun Heo24aa0782011-07-12 11:16:06 +020031 memblock_reserve(start_bad, end_bad - start_bad);
Andreas Herrmann7dad169e2009-02-25 11:28:07 +010032}
33
Vladimir Murzin7f70bae2015-04-14 15:48:30 -070034static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size)
Yinghai Lu1f067162008-07-15 00:02:28 -070035{
Thomas Gleixner9866b7e2009-06-11 16:25:01 +020036 u64 *p, *start, *end;
Vladimir Murzin7f70bae2015-04-14 15:48:30 -070037 phys_addr_t start_bad, last_bad;
38 phys_addr_t start_phys_aligned;
Thomas Gleixner9866b7e2009-06-11 16:25:01 +020039 const size_t incr = sizeof(pattern);
Yinghai Lu1f067162008-07-15 00:02:28 -070040
Yinghai Lu1f067162008-07-15 00:02:28 -070041 start_phys_aligned = ALIGN(start_phys, incr);
Yinghai Lu1f067162008-07-15 00:02:28 -070042 start = __va(start_phys_aligned);
Thomas Gleixner9866b7e2009-06-11 16:25:01 +020043 end = start + (size - (start_phys_aligned - start_phys)) / incr;
Yinghai Lu1f067162008-07-15 00:02:28 -070044 start_bad = 0;
45 last_bad = 0;
46
Andreas Herrmannc9690992009-06-08 19:09:39 +020047 for (p = start; p < end; p++)
48 *p = pattern;
Thomas Gleixner9866b7e2009-06-11 16:25:01 +020049
Andreas Herrmannc9690992009-06-08 19:09:39 +020050 for (p = start; p < end; p++, start_phys_aligned += incr) {
51 if (*p == pattern)
Andreas Herrmann7dad169e2009-02-25 11:28:07 +010052 continue;
53 if (start_phys_aligned == last_bad + incr) {
54 last_bad += incr;
55 continue;
Yinghai Lu1f067162008-07-15 00:02:28 -070056 }
Andreas Herrmann7dad169e2009-02-25 11:28:07 +010057 if (start_bad)
58 reserve_bad_mem(pattern, start_bad, last_bad + incr);
59 start_bad = last_bad = start_phys_aligned;
Yinghai Lu1f067162008-07-15 00:02:28 -070060 }
Andreas Herrmann7dad169e2009-02-25 11:28:07 +010061 if (start_bad)
62 reserve_bad_mem(pattern, start_bad, last_bad + incr);
Yinghai Lu1f067162008-07-15 00:02:28 -070063}
64
Vladimir Murzin7f70bae2015-04-14 15:48:30 -070065static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end)
Andreas Herrmannbfb4dc02009-02-25 11:30:04 +010066{
Tejun Heo8d89ac82011-07-12 11:16:00 +020067 u64 i;
68 phys_addr_t this_start, this_end;
Andreas Herrmannbfb4dc02009-02-25 11:30:04 +010069
Tony Luckfc6daaf2015-06-24 16:58:09 -070070 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start,
71 &this_end, NULL) {
Vladimir Murzin7f70bae2015-04-14 15:48:30 -070072 this_start = clamp(this_start, start, end);
73 this_end = clamp(this_end, start, end);
Tejun Heo8d89ac82011-07-12 11:16:00 +020074 if (this_start < this_end) {
Vladimir Murzinf373baf2015-09-08 15:00:19 -070075 pr_info(" %pa - %pa pattern %016llx\n",
76 &this_start, &this_end, cpu_to_be64(pattern));
Tejun Heo8d89ac82011-07-12 11:16:00 +020077 memtest(pattern, this_start, this_end - this_start);
78 }
Andreas Herrmannbfb4dc02009-02-25 11:30:04 +010079 }
80}
81
Yinghai Lu1f067162008-07-15 00:02:28 -070082/* default is disabled */
Vladimir Murzin06f80592015-09-08 15:00:16 -070083static unsigned int memtest_pattern __initdata;
Yinghai Lu1f067162008-07-15 00:02:28 -070084
85static int __init parse_memtest(char *arg)
86{
Vladimir Murzin06f80592015-09-08 15:00:16 -070087 int ret = 0;
88
Yinghai Lu1f067162008-07-15 00:02:28 -070089 if (arg)
Vladimir Murzin06f80592015-09-08 15:00:16 -070090 ret = kstrtouint(arg, 0, &memtest_pattern);
Yinghai Lud1a8e772009-03-06 03:12:50 -080091 else
92 memtest_pattern = ARRAY_SIZE(patterns);
93
Vladimir Murzin06f80592015-09-08 15:00:16 -070094 return ret;
Yinghai Lu1f067162008-07-15 00:02:28 -070095}
96
97early_param("memtest", parse_memtest);
98
Vladimir Murzin7f70bae2015-04-14 15:48:30 -070099void __init early_memtest(phys_addr_t start, phys_addr_t end)
Yinghai Lu1f067162008-07-15 00:02:28 -0700100{
Andreas Herrmann6d741712009-02-25 11:27:27 +0100101 unsigned int i;
Andreas Herrmannbfb4dc02009-02-25 11:30:04 +0100102 unsigned int idx = 0;
Yinghai Lu1f067162008-07-15 00:02:28 -0700103
104 if (!memtest_pattern)
105 return;
106
Vladimir Murzinf373baf2015-09-08 15:00:19 -0700107 pr_info("early_memtest: # of tests: %u\n", memtest_pattern);
Alexander Holler20bf0622013-02-16 16:38:17 +0100108 for (i = memtest_pattern-1; i < UINT_MAX; --i) {
Andreas Herrmannbfb4dc02009-02-25 11:30:04 +0100109 idx = i % ARRAY_SIZE(patterns);
110 do_one_pass(patterns[idx], start, end);
111 }
Yinghai Lu1f067162008-07-15 00:02:28 -0700112}