mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 15:25:02 +07:00
20bf062c65
By just reversing the order memtest is using the test patterns, an additional round to zero the memory is not necessary. This might save up to a second or even more for setups which are doing tests on every boot. Signed-off-by: Alexander Holler <holler@ahsoftware.de> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1361029097-8308-1-git-send-email-holler@ahsoftware.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
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, 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);
|
|
memblock_reserve(start_bad, end_bad - start_bad);
|
|
}
|
|
|
|
static void __init memtest(u64 pattern, u64 start_phys, u64 size)
|
|
{
|
|
u64 *p, *start, *end;
|
|
u64 start_bad, last_bad;
|
|
u64 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, u64 start, u64 end)
|
|
{
|
|
u64 i;
|
|
phys_addr_t this_start, this_end;
|
|
|
|
for_each_free_mem_range(i, MAX_NUMNODES, &this_start, &this_end, NULL) {
|
|
this_start = clamp_t(phys_addr_t, this_start, start, end);
|
|
this_end = clamp_t(phys_addr_t, 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(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 = memtest_pattern-1; i < UINT_MAX; --i) {
|
|
idx = i % ARRAY_SIZE(patterns);
|
|
do_one_pass(patterns[idx], start, end);
|
|
}
|
|
}
|