Git Repo - linux.git/blame_incremental

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