[mirror_ubuntu-bionic-kernel.git] / arch / x86 / mm / memtest.c

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/pfn.h>

#include <asm/e820.h>

static u64 patterns[] __initdata = {
	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, u64 start_bad, u64 end_bad)
{
	printk(KERN_INFO "  %016llx bad mem addr %010llx - %010llx reserved\n",
	       (unsigned long long) pattern,
	       (unsigned long long) start_bad,
	       (unsigned long long) end_bad);
	reserve_early(start_bad, end_bad, "BAD RAM");
}

static void __init memtest(u64 pattern, u64 start_phys, u64 size)
{
	u64 i, count;
	u64 *start;
	u64 start_bad, last_bad;
	u64 start_phys_aligned;
	size_t incr;

	incr = sizeof(pattern);
	start_phys_aligned = ALIGN(start_phys, incr);
	count = (size - (start_phys_aligned - start_phys))/incr;
	start = __va(start_phys_aligned);
	start_bad = 0;
	last_bad = 0;

	for (i = 0; i < count; i++)
		start[i] = pattern;
	for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
		if (*start == 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, u64 start, u64 end)
{
	u64 size = 0;

	while (start < end) {
		start = find_e820_area_size(start, &size, 1);

		/* done ? */
		if (start >= end)
			break;
		if (start + size > end)
			size = end - start;

		printk(KERN_INFO "  %010llx - %010llx pattern %016llx\n",
		       (unsigned long long) start,
		       (unsigned long long) start + size,
		       (unsigned long long) cpu_to_be64(pattern));
		memtest(pattern, start, size);

		start += size;
	}
}

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

static int __init parse_memtest(char *arg)
{
	if (arg)
		memtest_pattern = simple_strtoul(arg, NULL, 0);
	else
		memtest_pattern = ARRAY_SIZE(patterns);

	return 0;
}

early_param("memtest", parse_memtest);

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

	if (!memtest_pattern)
		return;

	printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
	for (i = 0; i < memtest_pattern; i++) {
		idx = i % ARRAY_SIZE(patterns);
		do_one_pass(patterns[idx], start, end);
	}

	if (idx > 0) {
		printk(KERN_INFO "early_memtest: wipe out "
		       "test pattern from memory\n");
		/* additional test with pattern 0 will do this */
		do_one_pass(0, start, end);
	}
}
Commit	Line	Data
1f067167 YL	1	#include <linux/kernel.h>
	2	#include <linux/errno.h>
	3	#include <linux/string.h>
	4	#include <linux/types.h>
	5	#include <linux/mm.h>
	6	#include <linux/smp.h>
	7	#include <linux/init.h>
	8	#include <linux/pfn.h>
	9
	10	#include <asm/e820.h>
	11
6d74171b AH	12	static u64 patterns[] __initdata = {
	13	0,
	14	0xffffffffffffffffULL,
	15	0x5555555555555555ULL,
	16	0xaaaaaaaaaaaaaaaaULL,
63823126 AH	17	0x1111111111111111ULL,
	18	0x2222222222222222ULL,
	19	0x4444444444444444ULL,
	20	0x8888888888888888ULL,
	21	0x3333333333333333ULL,
	22	0x6666666666666666ULL,
	23	0x9999999999999999ULL,
	24	0xccccccccccccccccULL,
	25	0x7777777777777777ULL,
	26	0xbbbbbbbbbbbbbbbbULL,
	27	0xddddddddddddddddULL,
	28	0xeeeeeeeeeeeeeeeeULL,
	29	0x7a6c7258554e494cULL, /* yeah ;-) */
6d74171b	30	};
40823f73	31
570c9e69	32	static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
7dad169e	33	{
570c9e69 AH	34	printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n",
	35	(unsigned long long) pattern,
	36	(unsigned long long) start_bad,
	37	(unsigned long long) end_bad);
7dad169e AH	38	reserve_early(start_bad, end_bad, "BAD RAM");
	39	}
	40
570c9e69	41	static void __init memtest(u64 pattern, u64 start_phys, u64 size)
1f067167	42	{
570c9e69	43	u64 i, count;
6d74171b	44	u64 *start;
570c9e69 AH	45	u64 start_bad, last_bad;
	46	u64 start_phys_aligned;
	47	size_t incr;
1f067167	48
6d74171b	49	incr = sizeof(pattern);
1f067167 YL	50	start_phys_aligned = ALIGN(start_phys, incr);
	51	count = (size - (start_phys_aligned - start_phys))/incr;
	52	start = __va(start_phys_aligned);
	53	start_bad = 0;
	54	last_bad = 0;
	55
	56	for (i = 0; i < count; i++)
6d74171b	57	start[i] = pattern;
1f067167	58	for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
7dad169e AH	59	if (*start == pattern)
	60	continue;
	61	if (start_phys_aligned == last_bad + incr) {
	62	last_bad += incr;
	63	continue;
1f067167	64	}
7dad169e AH	65	if (start_bad)
	66	reserve_bad_mem(pattern, start_bad, last_bad + incr);
	67	start_bad = last_bad = start_phys_aligned;
1f067167	68	}
7dad169e AH	69	if (start_bad)
7dad169e AH	70	reserve_bad_mem(pattern, start_bad, last_bad + incr);
1f067167 YL	71	}
1f067167 YL	72
bfb4dc0d AH	73	static void __init do_one_pass(u64 pattern, u64 start, u64 end)
	74	{
	75	u64 size = 0;
	76
	77	while (start < end) {
	78	start = find_e820_area_size(start, &size, 1);
	79
	80	/* done ? */
	81	if (start >= end)
	82	break;
	83	if (start + size > end)
	84	size = end - start;
	85
	86	printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
	87	(unsigned long long) start,
	88	(unsigned long long) start + size,
	89	(unsigned long long) cpu_to_be64(pattern));
	90	memtest(pattern, start, size);
	91
	92	start += size;
	93	}
	94	}
	95
1f067167 YL	96	/* default is disabled */
	97	static int memtest_pattern __initdata;
	98
	99	static int __init parse_memtest(char *arg)
	100	{
	101	if (arg)
	102	memtest_pattern = simple_strtoul(arg, NULL, 0);
d1a8e779 YL	103	else
	104	memtest_pattern = ARRAY_SIZE(patterns);
	105
1f067167 YL	106	return 0;
	107	}
	108
	109	early_param("memtest", parse_memtest);
	110
	111	void __init early_memtest(unsigned long start, unsigned long end)
	112	{
6d74171b	113	unsigned int i;
bfb4dc0d	114	unsigned int idx = 0;
1f067167 YL	115
	116	if (!memtest_pattern)
	117	return;
	118
570c9e69	119	printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
6d74171b	120	for (i = 0; i < memtest_pattern; i++) {
bfb4dc0d AH	121	idx = i % ARRAY_SIZE(patterns);
	122	do_one_pass(patterns[idx], start, end);
	123	}
	124
	125	if (idx > 0) {
	126	printk(KERN_INFO "early_memtest: wipe out "
	127	"test pattern from memory\n");
	128	/* additional test with pattern 0 will do this */
	129	do_one_pass(0, start, end);
1f067167	130	}
1f067167	131	}