^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/proto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Some BIOSes seem to corrupt the low 64k of memory during events
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * like suspend/resume and unplugging an HDMI cable. Reserve all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * remaining free memory in that area and fill it with a distinct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * pattern.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define MAX_SCAN_AREAS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static int __read_mostly memory_corruption_check = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static unsigned __read_mostly corruption_check_size = 64*1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static unsigned __read_mostly corruption_check_period = 60; /* seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static struct scan_area {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) u64 addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) u64 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) } scan_areas[MAX_SCAN_AREAS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static int num_scan_areas;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static __init int set_corruption_check(char *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) unsigned long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (!arg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) pr_err("memory_corruption_check config string not provided\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) ret = kstrtoul(arg, 10, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) memory_corruption_check = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) early_param("memory_corruption_check", set_corruption_check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static __init int set_corruption_check_period(char *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (!arg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) pr_err("memory_corruption_check_period config string not provided\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ret = kstrtoul(arg, 10, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) corruption_check_period = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) early_param("memory_corruption_check_period", set_corruption_check_period);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static __init int set_corruption_check_size(char *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) char *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) unsigned size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!arg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) pr_err("memory_corruption_check_size config string not provided\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) size = memparse(arg, &end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (*end == '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) corruption_check_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return (size == corruption_check_size) ? 0 : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) early_param("memory_corruption_check_size", set_corruption_check_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) void __init setup_bios_corruption_check(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) phys_addr_t start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) u64 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (memory_corruption_check == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) memory_corruption_check =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #ifdef CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (corruption_check_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) memory_corruption_check = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!memory_corruption_check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) corruption_check_size = round_up(corruption_check_size, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) start = clamp_t(phys_addr_t, round_up(start, PAGE_SIZE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) PAGE_SIZE, corruption_check_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) end = clamp_t(phys_addr_t, round_down(end, PAGE_SIZE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) PAGE_SIZE, corruption_check_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (start >= end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) memblock_reserve(start, end - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) scan_areas[num_scan_areas].addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) scan_areas[num_scan_areas].size = end - start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /* Assume we've already mapped this early memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) memset(__va(start), 0, end - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (++num_scan_areas >= MAX_SCAN_AREAS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (num_scan_areas)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) pr_info("Scanning %d areas for low memory corruption\n", num_scan_areas);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static void check_for_bios_corruption(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int corruption = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (!memory_corruption_check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) for (i = 0; i < num_scan_areas; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) unsigned long *addr = __va(scan_areas[i].addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) unsigned long size = scan_areas[i].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) for (; size; addr++, size -= sizeof(unsigned long)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!*addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) pr_err("Corrupted low memory at %p (%lx phys) = %08lx\n", addr, __pa(addr), *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) corruption = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) *addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) WARN_ONCE(corruption, KERN_ERR "Memory corruption detected in low memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static void check_corruption(struct work_struct *dummy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static DECLARE_DELAYED_WORK(bios_check_work, check_corruption);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static void check_corruption(struct work_struct *dummy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) check_for_bios_corruption();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) schedule_delayed_work(&bios_check_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) round_jiffies_relative(corruption_check_period*HZ));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static int start_periodic_check_for_corruption(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (!num_scan_areas || !memory_corruption_check || corruption_check_period == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) pr_info("Scanning for low memory corruption every %d seconds\n", corruption_check_period);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /* First time we run the checks right away */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) schedule_delayed_work(&bios_check_work, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) device_initcall(start_periodic_check_for_corruption);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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