mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 09:46:43 +07:00
1f067167a8
it's separate functionality that deserves its own file. This also prepares 32-bit memtest support. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
124 lines
2.6 KiB
C
124 lines
2.6 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 <asm/e820.h>
|
|
|
|
static void __init memtest(unsigned long start_phys, unsigned long size,
|
|
unsigned pattern)
|
|
{
|
|
unsigned long i;
|
|
unsigned long *start;
|
|
unsigned long start_bad;
|
|
unsigned long last_bad;
|
|
unsigned long val;
|
|
unsigned long start_phys_aligned;
|
|
unsigned long count;
|
|
unsigned long incr;
|
|
|
|
switch (pattern) {
|
|
case 0:
|
|
val = 0UL;
|
|
break;
|
|
case 1:
|
|
val = -1UL;
|
|
break;
|
|
case 2:
|
|
#ifdef CONFIG_X86_64
|
|
val = 0x5555555555555555UL;
|
|
#else
|
|
val = 0x55555555UL;
|
|
#endif
|
|
break;
|
|
case 3:
|
|
#ifdef CONFIG_X86_64
|
|
val = 0xaaaaaaaaaaaaaaaaUL;
|
|
#else
|
|
val = 0xaaaaaaaaUL;
|
|
#endif
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
incr = sizeof(unsigned long);
|
|
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] = val;
|
|
for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
|
|
if (*start != val) {
|
|
if (start_phys_aligned == last_bad + incr) {
|
|
last_bad += incr;
|
|
} else {
|
|
if (start_bad) {
|
|
printk(KERN_CONT "\n %010lx bad mem addr %010lx - %010lx reserved",
|
|
val, start_bad, last_bad + incr);
|
|
reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
|
|
}
|
|
start_bad = last_bad = start_phys_aligned;
|
|
}
|
|
}
|
|
}
|
|
if (start_bad) {
|
|
printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved",
|
|
val, start_bad, last_bad + incr);
|
|
reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
|
|
}
|
|
|
|
}
|
|
|
|
/* default is disabled */
|
|
static int memtest_pattern __initdata;
|
|
|
|
static int __init parse_memtest(char *arg)
|
|
{
|
|
if (arg)
|
|
memtest_pattern = simple_strtoul(arg, NULL, 0);
|
|
return 0;
|
|
}
|
|
|
|
early_param("memtest", parse_memtest);
|
|
|
|
void __init early_memtest(unsigned long start, unsigned long end)
|
|
{
|
|
u64 t_start, t_size;
|
|
unsigned pattern;
|
|
|
|
if (!memtest_pattern)
|
|
return;
|
|
|
|
printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
|
|
for (pattern = 0; pattern < memtest_pattern; pattern++) {
|
|
t_start = start;
|
|
t_size = 0;
|
|
while (t_start < end) {
|
|
t_start = find_e820_area_size(t_start, &t_size, 1);
|
|
|
|
/* done ? */
|
|
if (t_start >= end)
|
|
break;
|
|
if (t_start + t_size > end)
|
|
t_size = end - t_start;
|
|
|
|
printk(KERN_CONT "\n %010llx - %010llx pattern %d",
|
|
(unsigned long long)t_start,
|
|
(unsigned long long)t_start + t_size, pattern);
|
|
|
|
memtest(t_start, t_size, pattern);
|
|
|
|
t_start += t_size;
|
|
}
|
|
}
|
|
printk(KERN_CONT "\n");
|
|
}
|