Contributors: 18
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Arjan van de Ven |
357 |
52.27% |
4 |
14.29% |
| Jeremy Fitzhardinge |
77 |
11.27% |
3 |
10.71% |
| Tejun Heo |
70 |
10.25% |
2 |
7.14% |
| He Zhe |
58 |
8.49% |
2 |
7.14% |
| Shuah Khan |
44 |
6.44% |
1 |
3.57% |
| Yinghai Lu |
22 |
3.22% |
4 |
14.29% |
| Hugh Dickins |
13 |
1.90% |
1 |
3.57% |
| Zachary Amsden |
10 |
1.46% |
1 |
3.57% |
| Chumbalkar Nagananda |
7 |
1.02% |
1 |
3.57% |
| Glauber de Oliveira Costa |
7 |
1.02% |
1 |
3.57% |
| Linus Torvalds (pre-git) |
6 |
0.88% |
1 |
3.57% |
| Jan Kiszka |
3 |
0.44% |
1 |
3.57% |
| Tony Luck |
2 |
0.29% |
1 |
3.57% |
| Paul Gortmaker |
2 |
0.29% |
1 |
3.57% |
| Andrew Morton |
2 |
0.29% |
1 |
3.57% |
| Grygorii Strashko |
1 |
0.15% |
1 |
3.57% |
| Greg Kroah-Hartman |
1 |
0.15% |
1 |
3.57% |
| Yi Wang |
1 |
0.15% |
1 |
3.57% |
| Total |
683 |
|
28 |
|
// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/workqueue.h>
#include <linux/memblock.h>
#include <asm/proto.h>
#include <asm/setup.h>
/*
* Some BIOSes seem to corrupt the low 64k of memory during events
* like suspend/resume and unplugging an HDMI cable. Reserve all
* remaining free memory in that area and fill it with a distinct
* pattern.
*/
#define MAX_SCAN_AREAS 8
static int __read_mostly memory_corruption_check = -1;
static unsigned __read_mostly corruption_check_size = 64*1024;
static unsigned __read_mostly corruption_check_period = 60; /* seconds */
static struct scan_area {
u64 addr;
u64 size;
} scan_areas[MAX_SCAN_AREAS];
static int num_scan_areas;
static __init int set_corruption_check(char *arg)
{
ssize_t ret;
unsigned long val;
if (!arg) {
pr_err("memory_corruption_check config string not provided\n");
return -EINVAL;
}
ret = kstrtoul(arg, 10, &val);
if (ret)
return ret;
memory_corruption_check = val;
return 0;
}
early_param("memory_corruption_check", set_corruption_check);
static __init int set_corruption_check_period(char *arg)
{
ssize_t ret;
unsigned long val;
if (!arg) {
pr_err("memory_corruption_check_period config string not provided\n");
return -EINVAL;
}
ret = kstrtoul(arg, 10, &val);
if (ret)
return ret;
corruption_check_period = val;
return 0;
}
early_param("memory_corruption_check_period", set_corruption_check_period);
static __init int set_corruption_check_size(char *arg)
{
char *end;
unsigned size;
if (!arg) {
pr_err("memory_corruption_check_size config string not provided\n");
return -EINVAL;
}
size = memparse(arg, &end);
if (*end == '\0')
corruption_check_size = size;
return (size == corruption_check_size) ? 0 : -EINVAL;
}
early_param("memory_corruption_check_size", set_corruption_check_size);
void __init setup_bios_corruption_check(void)
{
phys_addr_t start, end;
u64 i;
if (memory_corruption_check == -1) {
memory_corruption_check =
#ifdef CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
1
#else
0
#endif
;
}
if (corruption_check_size == 0)
memory_corruption_check = 0;
if (!memory_corruption_check)
return;
corruption_check_size = round_up(corruption_check_size, PAGE_SIZE);
for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
NULL) {
start = clamp_t(phys_addr_t, round_up(start, PAGE_SIZE),
PAGE_SIZE, corruption_check_size);
end = clamp_t(phys_addr_t, round_down(end, PAGE_SIZE),
PAGE_SIZE, corruption_check_size);
if (start >= end)
continue;
memblock_reserve(start, end - start);
scan_areas[num_scan_areas].addr = start;
scan_areas[num_scan_areas].size = end - start;
/* Assume we've already mapped this early memory */
memset(__va(start), 0, end - start);
if (++num_scan_areas >= MAX_SCAN_AREAS)
break;
}
if (num_scan_areas)
pr_info("Scanning %d areas for low memory corruption\n", num_scan_areas);
}
static void check_for_bios_corruption(void)
{
int i;
int corruption = 0;
if (!memory_corruption_check)
return;
for (i = 0; i < num_scan_areas; i++) {
unsigned long *addr = __va(scan_areas[i].addr);
unsigned long size = scan_areas[i].size;
for (; size; addr++, size -= sizeof(unsigned long)) {
if (!*addr)
continue;
pr_err("Corrupted low memory at %p (%lx phys) = %08lx\n", addr, __pa(addr), *addr);
corruption = 1;
*addr = 0;
}
}
WARN_ONCE(corruption, KERN_ERR "Memory corruption detected in low memory\n");
}
static void check_corruption(struct work_struct *dummy);
static DECLARE_DELAYED_WORK(bios_check_work, check_corruption);
static void check_corruption(struct work_struct *dummy)
{
check_for_bios_corruption();
schedule_delayed_work(&bios_check_work,
round_jiffies_relative(corruption_check_period*HZ));
}
static int start_periodic_check_for_corruption(void)
{
if (!num_scan_areas || !memory_corruption_check || corruption_check_period == 0)
return 0;
pr_info("Scanning for low memory corruption every %d seconds\n", corruption_check_period);
/* First time we run the checks right away */
schedule_delayed_work(&bios_check_work, 0);
return 0;
}
device_initcall(start_periodic_check_for_corruption);