[mirror_ubuntu-artful-kernel.git] / 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 <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)
{
	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);
	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) {
			printk(KERN_INFO "  %010llx - %010llx pattern %016llx\n",
			       (unsigned long long)this_start,
			       (unsigned long long)this_end,
			       (unsigned long long)cpu_to_be64(pattern));
			memtest(pattern, this_start, this_end - this_start);
		}
	}
}

/* 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(phys_addr_t start, phys_addr_t 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 = memtest_pattern-1; i < UINT_MAX; --i) {
		idx = i % ARRAY_SIZE(patterns);
		do_one_pass(patterns[idx], 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>
a9ce6bc1	9	#include <linux/memblock.h>
1f067167	10
6d74171b	11	static u64 patterns[] __initdata = {
20bf062c	12	/* The first entry has to be 0 to leave memtest with zeroed memory */
6d74171b AH	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
7f70baee	32	static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t 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);
24aa0788	38	memblock_reserve(start_bad, end_bad - start_bad);
7dad169e AH	39	}
7dad169e AH	40
7f70baee	41	static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size)
1f067167	42	{
9866b7e8	43	u64 p, start, *end;
7f70baee VM	44	phys_addr_t start_bad, last_bad;
7f70baee VM	45	phys_addr_t start_phys_aligned;
9866b7e8	46	const size_t incr = sizeof(pattern);
1f067167	47
1f067167	48	start_phys_aligned = ALIGN(start_phys, incr);
1f067167	49	start = __va(start_phys_aligned);
9866b7e8	50	end = start + (size - (start_phys_aligned - start_phys)) / incr;
1f067167 YL	51	start_bad = 0;
	52	last_bad = 0;
	53
c9690998 AH	54	for (p = start; p < end; p++)
c9690998 AH	55	*p = pattern;
9866b7e8	56
c9690998 AH	57	for (p = start; p < end; p++, start_phys_aligned += incr) {
c9690998 AH	58	if (*p == pattern)
7dad169e AH	59	continue;
	60	if (start_phys_aligned == last_bad + incr) {
	61	last_bad += incr;
	62	continue;
1f067167	63	}
7dad169e AH	64	if (start_bad)
	65	reserve_bad_mem(pattern, start_bad, last_bad + incr);
	66	start_bad = last_bad = start_phys_aligned;
1f067167	67	}
7dad169e AH	68	if (start_bad)
7dad169e AH	69	reserve_bad_mem(pattern, start_bad, last_bad + incr);
1f067167 YL	70	}
1f067167 YL	71
7f70baee	72	static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end)
bfb4dc0d	73	{
8d89ac80 TH	74	u64 i;
	75	phys_addr_t this_start, this_end;
	76
fc6daaf9 TL	77	for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start,
fc6daaf9 TL	78	&this_end, NULL) {
7f70baee VM	79	this_start = clamp(this_start, start, end);
7f70baee VM	80	this_end = clamp(this_end, start, end);
8d89ac80 TH	81	if (this_start < this_end) {
	82	printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
	83	(unsigned long long)this_start,
	84	(unsigned long long)this_end,
	85	(unsigned long long)cpu_to_be64(pattern));
	86	memtest(pattern, this_start, this_end - this_start);
	87	}
bfb4dc0d AH	88	}
	89	}
	90
1f067167 YL	91	/* default is disabled */
	92	static int memtest_pattern __initdata;
	93
	94	static int __init parse_memtest(char *arg)
	95	{
	96	if (arg)
	97	memtest_pattern = simple_strtoul(arg, NULL, 0);
d1a8e779 YL	98	else
	99	memtest_pattern = ARRAY_SIZE(patterns);
	100
1f067167 YL	101	return 0;
	102	}
	103
	104	early_param("memtest", parse_memtest);
	105
7f70baee	106	void __init early_memtest(phys_addr_t start, phys_addr_t end)
1f067167	107	{
6d74171b	108	unsigned int i;
bfb4dc0d	109	unsigned int idx = 0;
1f067167 YL	110
	111	if (!memtest_pattern)
	112	return;
	113
570c9e69	114	printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
20bf062c	115	for (i = memtest_pattern-1; i < UINT_MAX; --i) {
bfb4dc0d AH	116	idx = i % ARRAY_SIZE(patterns);
	117	do_one_pass(patterns[idx], start, end);
	118	}
1f067167	119	}