mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
a0b1280368
Depending on configuration mem_section can now be an array or a pointer
to an array allocated dynamically. In most cases, we can continue to
refer to it as 'mem_section' regardless of what it is.
But there's one exception: '&mem_section' means "address of the array"
if mem_section is an array, but if mem_section is a pointer, it would
mean "address of the pointer".
We've stepped onto this in kdump code. VMCOREINFO_SYMBOL(mem_section)
writes down address of pointer into vmcoreinfo, not array as we wanted.
Let's introduce VMCOREINFO_SYMBOL_ARRAY() that would handle the
situation correctly for both cases.
Link: http://lkml.kernel.org/r/20180112162532.35896-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Fixes: 83e3c48729
("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y")
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
473 lines
11 KiB
C
473 lines
11 KiB
C
/*
|
|
* crash.c - kernel crash support code.
|
|
* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
|
|
*
|
|
* This source code is licensed under the GNU General Public License,
|
|
* Version 2. See the file COPYING for more details.
|
|
*/
|
|
|
|
#include <linux/crash_core.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/sections.h>
|
|
|
|
/* vmcoreinfo stuff */
|
|
static unsigned char *vmcoreinfo_data;
|
|
static size_t vmcoreinfo_size;
|
|
u32 *vmcoreinfo_note;
|
|
|
|
/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
|
|
static unsigned char *vmcoreinfo_data_safecopy;
|
|
|
|
/*
|
|
* parsing the "crashkernel" commandline
|
|
*
|
|
* this code is intended to be called from architecture specific code
|
|
*/
|
|
|
|
|
|
/*
|
|
* This function parses command lines in the format
|
|
*
|
|
* crashkernel=ramsize-range:size[,...][@offset]
|
|
*
|
|
* The function returns 0 on success and -EINVAL on failure.
|
|
*/
|
|
static int __init parse_crashkernel_mem(char *cmdline,
|
|
unsigned long long system_ram,
|
|
unsigned long long *crash_size,
|
|
unsigned long long *crash_base)
|
|
{
|
|
char *cur = cmdline, *tmp;
|
|
|
|
/* for each entry of the comma-separated list */
|
|
do {
|
|
unsigned long long start, end = ULLONG_MAX, size;
|
|
|
|
/* get the start of the range */
|
|
start = memparse(cur, &tmp);
|
|
if (cur == tmp) {
|
|
pr_warn("crashkernel: Memory value expected\n");
|
|
return -EINVAL;
|
|
}
|
|
cur = tmp;
|
|
if (*cur != '-') {
|
|
pr_warn("crashkernel: '-' expected\n");
|
|
return -EINVAL;
|
|
}
|
|
cur++;
|
|
|
|
/* if no ':' is here, than we read the end */
|
|
if (*cur != ':') {
|
|
end = memparse(cur, &tmp);
|
|
if (cur == tmp) {
|
|
pr_warn("crashkernel: Memory value expected\n");
|
|
return -EINVAL;
|
|
}
|
|
cur = tmp;
|
|
if (end <= start) {
|
|
pr_warn("crashkernel: end <= start\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (*cur != ':') {
|
|
pr_warn("crashkernel: ':' expected\n");
|
|
return -EINVAL;
|
|
}
|
|
cur++;
|
|
|
|
size = memparse(cur, &tmp);
|
|
if (cur == tmp) {
|
|
pr_warn("Memory value expected\n");
|
|
return -EINVAL;
|
|
}
|
|
cur = tmp;
|
|
if (size >= system_ram) {
|
|
pr_warn("crashkernel: invalid size\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* match ? */
|
|
if (system_ram >= start && system_ram < end) {
|
|
*crash_size = size;
|
|
break;
|
|
}
|
|
} while (*cur++ == ',');
|
|
|
|
if (*crash_size > 0) {
|
|
while (*cur && *cur != ' ' && *cur != '@')
|
|
cur++;
|
|
if (*cur == '@') {
|
|
cur++;
|
|
*crash_base = memparse(cur, &tmp);
|
|
if (cur == tmp) {
|
|
pr_warn("Memory value expected after '@'\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
} else
|
|
pr_info("crashkernel size resulted in zero bytes\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* That function parses "simple" (old) crashkernel command lines like
|
|
*
|
|
* crashkernel=size[@offset]
|
|
*
|
|
* It returns 0 on success and -EINVAL on failure.
|
|
*/
|
|
static int __init parse_crashkernel_simple(char *cmdline,
|
|
unsigned long long *crash_size,
|
|
unsigned long long *crash_base)
|
|
{
|
|
char *cur = cmdline;
|
|
|
|
*crash_size = memparse(cmdline, &cur);
|
|
if (cmdline == cur) {
|
|
pr_warn("crashkernel: memory value expected\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (*cur == '@')
|
|
*crash_base = memparse(cur+1, &cur);
|
|
else if (*cur != ' ' && *cur != '\0') {
|
|
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define SUFFIX_HIGH 0
|
|
#define SUFFIX_LOW 1
|
|
#define SUFFIX_NULL 2
|
|
static __initdata char *suffix_tbl[] = {
|
|
[SUFFIX_HIGH] = ",high",
|
|
[SUFFIX_LOW] = ",low",
|
|
[SUFFIX_NULL] = NULL,
|
|
};
|
|
|
|
/*
|
|
* That function parses "suffix" crashkernel command lines like
|
|
*
|
|
* crashkernel=size,[high|low]
|
|
*
|
|
* It returns 0 on success and -EINVAL on failure.
|
|
*/
|
|
static int __init parse_crashkernel_suffix(char *cmdline,
|
|
unsigned long long *crash_size,
|
|
const char *suffix)
|
|
{
|
|
char *cur = cmdline;
|
|
|
|
*crash_size = memparse(cmdline, &cur);
|
|
if (cmdline == cur) {
|
|
pr_warn("crashkernel: memory value expected\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* check with suffix */
|
|
if (strncmp(cur, suffix, strlen(suffix))) {
|
|
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
|
return -EINVAL;
|
|
}
|
|
cur += strlen(suffix);
|
|
if (*cur != ' ' && *cur != '\0') {
|
|
pr_warn("crashkernel: unrecognized char: %c\n", *cur);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __init char *get_last_crashkernel(char *cmdline,
|
|
const char *name,
|
|
const char *suffix)
|
|
{
|
|
char *p = cmdline, *ck_cmdline = NULL;
|
|
|
|
/* find crashkernel and use the last one if there are more */
|
|
p = strstr(p, name);
|
|
while (p) {
|
|
char *end_p = strchr(p, ' ');
|
|
char *q;
|
|
|
|
if (!end_p)
|
|
end_p = p + strlen(p);
|
|
|
|
if (!suffix) {
|
|
int i;
|
|
|
|
/* skip the one with any known suffix */
|
|
for (i = 0; suffix_tbl[i]; i++) {
|
|
q = end_p - strlen(suffix_tbl[i]);
|
|
if (!strncmp(q, suffix_tbl[i],
|
|
strlen(suffix_tbl[i])))
|
|
goto next;
|
|
}
|
|
ck_cmdline = p;
|
|
} else {
|
|
q = end_p - strlen(suffix);
|
|
if (!strncmp(q, suffix, strlen(suffix)))
|
|
ck_cmdline = p;
|
|
}
|
|
next:
|
|
p = strstr(p+1, name);
|
|
}
|
|
|
|
if (!ck_cmdline)
|
|
return NULL;
|
|
|
|
return ck_cmdline;
|
|
}
|
|
|
|
static int __init __parse_crashkernel(char *cmdline,
|
|
unsigned long long system_ram,
|
|
unsigned long long *crash_size,
|
|
unsigned long long *crash_base,
|
|
const char *name,
|
|
const char *suffix)
|
|
{
|
|
char *first_colon, *first_space;
|
|
char *ck_cmdline;
|
|
|
|
BUG_ON(!crash_size || !crash_base);
|
|
*crash_size = 0;
|
|
*crash_base = 0;
|
|
|
|
ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
|
|
|
|
if (!ck_cmdline)
|
|
return -EINVAL;
|
|
|
|
ck_cmdline += strlen(name);
|
|
|
|
if (suffix)
|
|
return parse_crashkernel_suffix(ck_cmdline, crash_size,
|
|
suffix);
|
|
/*
|
|
* if the commandline contains a ':', then that's the extended
|
|
* syntax -- if not, it must be the classic syntax
|
|
*/
|
|
first_colon = strchr(ck_cmdline, ':');
|
|
first_space = strchr(ck_cmdline, ' ');
|
|
if (first_colon && (!first_space || first_colon < first_space))
|
|
return parse_crashkernel_mem(ck_cmdline, system_ram,
|
|
crash_size, crash_base);
|
|
|
|
return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
|
|
}
|
|
|
|
/*
|
|
* That function is the entry point for command line parsing and should be
|
|
* called from the arch-specific code.
|
|
*/
|
|
int __init parse_crashkernel(char *cmdline,
|
|
unsigned long long system_ram,
|
|
unsigned long long *crash_size,
|
|
unsigned long long *crash_base)
|
|
{
|
|
return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
|
|
"crashkernel=", NULL);
|
|
}
|
|
|
|
int __init parse_crashkernel_high(char *cmdline,
|
|
unsigned long long system_ram,
|
|
unsigned long long *crash_size,
|
|
unsigned long long *crash_base)
|
|
{
|
|
return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
|
|
"crashkernel=", suffix_tbl[SUFFIX_HIGH]);
|
|
}
|
|
|
|
int __init parse_crashkernel_low(char *cmdline,
|
|
unsigned long long system_ram,
|
|
unsigned long long *crash_size,
|
|
unsigned long long *crash_base)
|
|
{
|
|
return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
|
|
"crashkernel=", suffix_tbl[SUFFIX_LOW]);
|
|
}
|
|
|
|
Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
|
|
void *data, size_t data_len)
|
|
{
|
|
struct elf_note *note = (struct elf_note *)buf;
|
|
|
|
note->n_namesz = strlen(name) + 1;
|
|
note->n_descsz = data_len;
|
|
note->n_type = type;
|
|
buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
|
|
memcpy(buf, name, note->n_namesz);
|
|
buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
|
|
memcpy(buf, data, data_len);
|
|
buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
|
|
|
|
return buf;
|
|
}
|
|
|
|
void final_note(Elf_Word *buf)
|
|
{
|
|
memset(buf, 0, sizeof(struct elf_note));
|
|
}
|
|
|
|
static void update_vmcoreinfo_note(void)
|
|
{
|
|
u32 *buf = vmcoreinfo_note;
|
|
|
|
if (!vmcoreinfo_size)
|
|
return;
|
|
buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
|
|
vmcoreinfo_size);
|
|
final_note(buf);
|
|
}
|
|
|
|
void crash_update_vmcoreinfo_safecopy(void *ptr)
|
|
{
|
|
if (ptr)
|
|
memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
|
|
|
|
vmcoreinfo_data_safecopy = ptr;
|
|
}
|
|
|
|
void crash_save_vmcoreinfo(void)
|
|
{
|
|
if (!vmcoreinfo_note)
|
|
return;
|
|
|
|
/* Use the safe copy to generate vmcoreinfo note if have */
|
|
if (vmcoreinfo_data_safecopy)
|
|
vmcoreinfo_data = vmcoreinfo_data_safecopy;
|
|
|
|
vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
|
|
update_vmcoreinfo_note();
|
|
}
|
|
|
|
void vmcoreinfo_append_str(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
char buf[0x50];
|
|
size_t r;
|
|
|
|
va_start(args, fmt);
|
|
r = vscnprintf(buf, sizeof(buf), fmt, args);
|
|
va_end(args);
|
|
|
|
r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
|
|
|
|
memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
|
|
|
|
vmcoreinfo_size += r;
|
|
}
|
|
|
|
/*
|
|
* provide an empty default implementation here -- architecture
|
|
* code may override this
|
|
*/
|
|
void __weak arch_crash_save_vmcoreinfo(void)
|
|
{}
|
|
|
|
phys_addr_t __weak paddr_vmcoreinfo_note(void)
|
|
{
|
|
return __pa(vmcoreinfo_note);
|
|
}
|
|
|
|
static int __init crash_save_vmcoreinfo_init(void)
|
|
{
|
|
vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
|
|
if (!vmcoreinfo_data) {
|
|
pr_warn("Memory allocation for vmcoreinfo_data failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
|
|
GFP_KERNEL | __GFP_ZERO);
|
|
if (!vmcoreinfo_note) {
|
|
free_page((unsigned long)vmcoreinfo_data);
|
|
vmcoreinfo_data = NULL;
|
|
pr_warn("Memory allocation for vmcoreinfo_note failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
|
|
VMCOREINFO_PAGESIZE(PAGE_SIZE);
|
|
|
|
VMCOREINFO_SYMBOL(init_uts_ns);
|
|
VMCOREINFO_SYMBOL(node_online_map);
|
|
#ifdef CONFIG_MMU
|
|
VMCOREINFO_SYMBOL(swapper_pg_dir);
|
|
#endif
|
|
VMCOREINFO_SYMBOL(_stext);
|
|
VMCOREINFO_SYMBOL(vmap_area_list);
|
|
|
|
#ifndef CONFIG_NEED_MULTIPLE_NODES
|
|
VMCOREINFO_SYMBOL(mem_map);
|
|
VMCOREINFO_SYMBOL(contig_page_data);
|
|
#endif
|
|
#ifdef CONFIG_SPARSEMEM
|
|
VMCOREINFO_SYMBOL_ARRAY(mem_section);
|
|
VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
|
|
VMCOREINFO_STRUCT_SIZE(mem_section);
|
|
VMCOREINFO_OFFSET(mem_section, section_mem_map);
|
|
#endif
|
|
VMCOREINFO_STRUCT_SIZE(page);
|
|
VMCOREINFO_STRUCT_SIZE(pglist_data);
|
|
VMCOREINFO_STRUCT_SIZE(zone);
|
|
VMCOREINFO_STRUCT_SIZE(free_area);
|
|
VMCOREINFO_STRUCT_SIZE(list_head);
|
|
VMCOREINFO_SIZE(nodemask_t);
|
|
VMCOREINFO_OFFSET(page, flags);
|
|
VMCOREINFO_OFFSET(page, _refcount);
|
|
VMCOREINFO_OFFSET(page, mapping);
|
|
VMCOREINFO_OFFSET(page, lru);
|
|
VMCOREINFO_OFFSET(page, _mapcount);
|
|
VMCOREINFO_OFFSET(page, private);
|
|
VMCOREINFO_OFFSET(page, compound_dtor);
|
|
VMCOREINFO_OFFSET(page, compound_order);
|
|
VMCOREINFO_OFFSET(page, compound_head);
|
|
VMCOREINFO_OFFSET(pglist_data, node_zones);
|
|
VMCOREINFO_OFFSET(pglist_data, nr_zones);
|
|
#ifdef CONFIG_FLAT_NODE_MEM_MAP
|
|
VMCOREINFO_OFFSET(pglist_data, node_mem_map);
|
|
#endif
|
|
VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
|
|
VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
|
|
VMCOREINFO_OFFSET(pglist_data, node_id);
|
|
VMCOREINFO_OFFSET(zone, free_area);
|
|
VMCOREINFO_OFFSET(zone, vm_stat);
|
|
VMCOREINFO_OFFSET(zone, spanned_pages);
|
|
VMCOREINFO_OFFSET(free_area, free_list);
|
|
VMCOREINFO_OFFSET(list_head, next);
|
|
VMCOREINFO_OFFSET(list_head, prev);
|
|
VMCOREINFO_OFFSET(vmap_area, va_start);
|
|
VMCOREINFO_OFFSET(vmap_area, list);
|
|
VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
|
|
log_buf_vmcoreinfo_setup();
|
|
VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
|
|
VMCOREINFO_NUMBER(NR_FREE_PAGES);
|
|
VMCOREINFO_NUMBER(PG_lru);
|
|
VMCOREINFO_NUMBER(PG_private);
|
|
VMCOREINFO_NUMBER(PG_swapcache);
|
|
VMCOREINFO_NUMBER(PG_slab);
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
VMCOREINFO_NUMBER(PG_hwpoison);
|
|
#endif
|
|
VMCOREINFO_NUMBER(PG_head_mask);
|
|
VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
|
|
#endif
|
|
|
|
arch_crash_save_vmcoreinfo();
|
|
update_vmcoreinfo_note();
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(crash_save_vmcoreinfo_init);
|