[mirror_ubuntu-zesty-kernel.git] / mm / memtest.c

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/memblock.h>

static u64 patterns[] __initdata = {
	/* The first entry has to be 0 to leave memtest with zeroed memory */
	0,
	0xffffffffffffffffULL,
	0x5555555555555555ULL,
	0xaaaaaaaaaaaaaaaaULL,
	0x1111111111111111ULL,
	0x2222222222222222ULL,
	0x4444444444444444ULL,
	0x8888888888888888ULL,
	0x3333333333333333ULL,
	0x6666666666666666ULL,
	0x9999999999999999ULL,
	0xccccccccccccccccULL,
	0x7777777777777777ULL,
	0xbbbbbbbbbbbbbbbbULL,
	0xddddddddddddddddULL,
	0xeeeeeeeeeeeeeeeeULL,
	0x7a6c7258554e494cULL, /* yeah ;-) */
};

static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad)
{
	pr_info("  %016llx bad mem addr %pa - %pa reserved\n",
		cpu_to_be64(pattern), &start_bad, &end_bad);
	memblock_reserve(start_bad, end_bad - start_bad);
}

static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size)
{
	u64 *p, *start, *end;
	phys_addr_t start_bad, last_bad;
	phys_addr_t start_phys_aligned;
	const size_t incr = sizeof(pattern);

	start_phys_aligned = ALIGN(start_phys, incr);
	start = __va(start_phys_aligned);
	end = start + (size - (start_phys_aligned - start_phys)) / incr;
	start_bad = 0;
	last_bad = 0;

	for (p = start; p < end; p++)
		*p = pattern;

	for (p = start; p < end; p++, start_phys_aligned += incr) {
		if (*p == pattern)
			continue;
		if (start_phys_aligned == last_bad + incr) {
			last_bad += incr;
			continue;
		}
		if (start_bad)
			reserve_bad_mem(pattern, start_bad, last_bad + incr);
		start_bad = last_bad = start_phys_aligned;
	}
	if (start_bad)
		reserve_bad_mem(pattern, start_bad, last_bad + incr);
}

static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end)
{
	u64 i;
	phys_addr_t this_start, this_end;

	for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start,
				&this_end, NULL) {
		this_start = clamp(this_start, start, end);
		this_end = clamp(this_end, start, end);
		if (this_start < this_end) {
			pr_info("  %pa - %pa pattern %016llx\n",
				&this_start, &this_end, cpu_to_be64(pattern));
			memtest(pattern, this_start, this_end - this_start);
		}
	}
}

/* default is disabled */
static unsigned int memtest_pattern __initdata;

static int __init parse_memtest(char *arg)
{
	int ret = 0;

	if (arg)
		ret = kstrtouint(arg, 0, &memtest_pattern);
	else
		memtest_pattern = ARRAY_SIZE(patterns);

	return ret;
}

early_param("memtest", parse_memtest);

void __init early_memtest(phys_addr_t start, phys_addr_t end)
{
	unsigned int i;
	unsigned int idx = 0;

	if (!memtest_pattern)
		return;

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