473 lines
11 KiB
C
473 lines
11 KiB
C
/*
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* crash.c - kernel crash support code.
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* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/crash_core.h>
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#include <linux/utsname.h>
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#include <linux/vmalloc.h>
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#include <asm/page.h>
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#include <asm/sections.h>
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/* vmcoreinfo stuff */
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static unsigned char *vmcoreinfo_data;
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static size_t vmcoreinfo_size;
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u32 *vmcoreinfo_note;
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/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
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static unsigned char *vmcoreinfo_data_safecopy;
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/*
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* parsing the "crashkernel" commandline
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*
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* this code is intended to be called from architecture specific code
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*/
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/*
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* This function parses command lines in the format
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*
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* crashkernel=ramsize-range:size[,...][@offset]
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*
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* The function returns 0 on success and -EINVAL on failure.
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*/
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static int __init parse_crashkernel_mem(char *cmdline,
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unsigned long long system_ram,
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unsigned long long *crash_size,
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unsigned long long *crash_base)
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{
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char *cur = cmdline, *tmp;
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/* for each entry of the comma-separated list */
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do {
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unsigned long long start, end = ULLONG_MAX, size;
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/* get the start of the range */
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start = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("crashkernel: Memory value expected\n");
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return -EINVAL;
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}
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cur = tmp;
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if (*cur != '-') {
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pr_warn("crashkernel: '-' expected\n");
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return -EINVAL;
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}
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cur++;
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/* if no ':' is here, than we read the end */
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if (*cur != ':') {
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end = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("crashkernel: Memory value expected\n");
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return -EINVAL;
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}
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cur = tmp;
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if (end <= start) {
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pr_warn("crashkernel: end <= start\n");
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return -EINVAL;
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}
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}
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if (*cur != ':') {
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pr_warn("crashkernel: ':' expected\n");
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return -EINVAL;
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}
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cur++;
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size = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("Memory value expected\n");
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return -EINVAL;
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}
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cur = tmp;
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if (size >= system_ram) {
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pr_warn("crashkernel: invalid size\n");
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return -EINVAL;
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}
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/* match ? */
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if (system_ram >= start && system_ram < end) {
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*crash_size = size;
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break;
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}
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} while (*cur++ == ',');
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if (*crash_size > 0) {
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while (*cur && *cur != ' ' && *cur != '@')
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cur++;
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if (*cur == '@') {
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cur++;
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*crash_base = memparse(cur, &tmp);
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if (cur == tmp) {
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pr_warn("Memory value expected after '@'\n");
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return -EINVAL;
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}
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}
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} else
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pr_info("crashkernel size resulted in zero bytes\n");
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return 0;
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}
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/*
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* That function parses "simple" (old) crashkernel command lines like
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*
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* crashkernel=size[@offset]
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*
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* It returns 0 on success and -EINVAL on failure.
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*/
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static int __init parse_crashkernel_simple(char *cmdline,
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unsigned long long *crash_size,
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unsigned long long *crash_base)
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{
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char *cur = cmdline;
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*crash_size = memparse(cmdline, &cur);
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if (cmdline == cur) {
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pr_warn("crashkernel: memory value expected\n");
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return -EINVAL;
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}
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if (*cur == '@')
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*crash_base = memparse(cur+1, &cur);
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else if (*cur != ' ' && *cur != '\0') {
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pr_warn("crashkernel: unrecognized char: %c\n", *cur);
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return -EINVAL;
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}
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return 0;
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}
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#define SUFFIX_HIGH 0
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#define SUFFIX_LOW 1
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#define SUFFIX_NULL 2
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static __initdata char *suffix_tbl[] = {
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[SUFFIX_HIGH] = ",high",
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[SUFFIX_LOW] = ",low",
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[SUFFIX_NULL] = NULL,
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};
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/*
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* That function parses "suffix" crashkernel command lines like
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*
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* crashkernel=size,[high|low]
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*
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* It returns 0 on success and -EINVAL on failure.
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*/
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static int __init parse_crashkernel_suffix(char *cmdline,
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unsigned long long *crash_size,
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const char *suffix)
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{
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char *cur = cmdline;
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*crash_size = memparse(cmdline, &cur);
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if (cmdline == cur) {
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pr_warn("crashkernel: memory value expected\n");
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return -EINVAL;
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}
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/* check with suffix */
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if (strncmp(cur, suffix, strlen(suffix))) {
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pr_warn("crashkernel: unrecognized char: %c\n", *cur);
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return -EINVAL;
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}
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cur += strlen(suffix);
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if (*cur != ' ' && *cur != '\0') {
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pr_warn("crashkernel: unrecognized char: %c\n", *cur);
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return -EINVAL;
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}
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return 0;
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}
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static __init char *get_last_crashkernel(char *cmdline,
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const char *name,
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const char *suffix)
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{
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char *p = cmdline, *ck_cmdline = NULL;
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/* find crashkernel and use the last one if there are more */
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p = strstr(p, name);
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while (p) {
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char *end_p = strchr(p, ' ');
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char *q;
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if (!end_p)
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end_p = p + strlen(p);
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if (!suffix) {
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int i;
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/* skip the one with any known suffix */
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for (i = 0; suffix_tbl[i]; i++) {
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q = end_p - strlen(suffix_tbl[i]);
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if (!strncmp(q, suffix_tbl[i],
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strlen(suffix_tbl[i])))
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goto next;
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}
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ck_cmdline = p;
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} else {
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q = end_p - strlen(suffix);
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if (!strncmp(q, suffix, strlen(suffix)))
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ck_cmdline = p;
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}
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next:
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p = strstr(p+1, name);
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}
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if (!ck_cmdline)
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return NULL;
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return ck_cmdline;
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}
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static int __init __parse_crashkernel(char *cmdline,
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unsigned long long system_ram,
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unsigned long long *crash_size,
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unsigned long long *crash_base,
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const char *name,
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const char *suffix)
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{
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char *first_colon, *first_space;
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char *ck_cmdline;
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BUG_ON(!crash_size || !crash_base);
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*crash_size = 0;
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*crash_base = 0;
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ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
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if (!ck_cmdline)
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return -EINVAL;
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ck_cmdline += strlen(name);
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if (suffix)
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return parse_crashkernel_suffix(ck_cmdline, crash_size,
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suffix);
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/*
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* if the commandline contains a ':', then that's the extended
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* syntax -- if not, it must be the classic syntax
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*/
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first_colon = strchr(ck_cmdline, ':');
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first_space = strchr(ck_cmdline, ' ');
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if (first_colon && (!first_space || first_colon < first_space))
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return parse_crashkernel_mem(ck_cmdline, system_ram,
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crash_size, crash_base);
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return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
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}
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/*
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* That function is the entry point for command line parsing and should be
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* called from the arch-specific code.
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*/
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int __init parse_crashkernel(char *cmdline,
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unsigned long long system_ram,
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unsigned long long *crash_size,
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unsigned long long *crash_base)
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{
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return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
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"crashkernel=", NULL);
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}
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int __init parse_crashkernel_high(char *cmdline,
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unsigned long long system_ram,
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unsigned long long *crash_size,
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unsigned long long *crash_base)
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{
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return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
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"crashkernel=", suffix_tbl[SUFFIX_HIGH]);
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}
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int __init parse_crashkernel_low(char *cmdline,
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unsigned long long system_ram,
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unsigned long long *crash_size,
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unsigned long long *crash_base)
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{
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return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
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"crashkernel=", suffix_tbl[SUFFIX_LOW]);
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}
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Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
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void *data, size_t data_len)
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{
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struct elf_note *note = (struct elf_note *)buf;
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note->n_namesz = strlen(name) + 1;
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note->n_descsz = data_len;
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note->n_type = type;
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buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
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memcpy(buf, name, note->n_namesz);
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buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
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memcpy(buf, data, data_len);
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buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
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return buf;
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}
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void final_note(Elf_Word *buf)
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{
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memset(buf, 0, sizeof(struct elf_note));
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}
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static void update_vmcoreinfo_note(void)
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{
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u32 *buf = vmcoreinfo_note;
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if (!vmcoreinfo_size)
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return;
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buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
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vmcoreinfo_size);
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final_note(buf);
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}
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void crash_update_vmcoreinfo_safecopy(void *ptr)
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{
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if (ptr)
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memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
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vmcoreinfo_data_safecopy = ptr;
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}
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void crash_save_vmcoreinfo(void)
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{
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if (!vmcoreinfo_note)
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return;
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/* Use the safe copy to generate vmcoreinfo note if have */
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if (vmcoreinfo_data_safecopy)
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vmcoreinfo_data = vmcoreinfo_data_safecopy;
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vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
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update_vmcoreinfo_note();
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}
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void vmcoreinfo_append_str(const char *fmt, ...)
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{
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va_list args;
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char buf[0x50];
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size_t r;
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va_start(args, fmt);
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r = vscnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
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memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
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vmcoreinfo_size += r;
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}
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/*
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* provide an empty default implementation here -- architecture
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* code may override this
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*/
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void __weak arch_crash_save_vmcoreinfo(void)
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{}
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phys_addr_t __weak paddr_vmcoreinfo_note(void)
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{
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return __pa(vmcoreinfo_note);
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}
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static int __init crash_save_vmcoreinfo_init(void)
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{
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vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
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if (!vmcoreinfo_data) {
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pr_warn("Memory allocation for vmcoreinfo_data failed\n");
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return -ENOMEM;
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}
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vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
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GFP_KERNEL | __GFP_ZERO);
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if (!vmcoreinfo_note) {
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free_page((unsigned long)vmcoreinfo_data);
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vmcoreinfo_data = NULL;
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pr_warn("Memory allocation for vmcoreinfo_note failed\n");
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return -ENOMEM;
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}
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VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
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VMCOREINFO_PAGESIZE(PAGE_SIZE);
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VMCOREINFO_SYMBOL(init_uts_ns);
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VMCOREINFO_SYMBOL(node_online_map);
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#ifdef CONFIG_MMU
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VMCOREINFO_SYMBOL(swapper_pg_dir);
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#endif
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VMCOREINFO_SYMBOL(_stext);
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VMCOREINFO_SYMBOL(vmap_area_list);
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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VMCOREINFO_SYMBOL(mem_map);
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VMCOREINFO_SYMBOL(contig_page_data);
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#endif
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#ifdef CONFIG_SPARSEMEM
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VMCOREINFO_SYMBOL(mem_section);
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VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
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VMCOREINFO_STRUCT_SIZE(mem_section);
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VMCOREINFO_OFFSET(mem_section, section_mem_map);
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#endif
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VMCOREINFO_STRUCT_SIZE(page);
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VMCOREINFO_STRUCT_SIZE(pglist_data);
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VMCOREINFO_STRUCT_SIZE(zone);
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VMCOREINFO_STRUCT_SIZE(free_area);
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VMCOREINFO_STRUCT_SIZE(list_head);
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VMCOREINFO_SIZE(nodemask_t);
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VMCOREINFO_OFFSET(page, flags);
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VMCOREINFO_OFFSET(page, _refcount);
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VMCOREINFO_OFFSET(page, mapping);
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VMCOREINFO_OFFSET(page, lru);
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VMCOREINFO_OFFSET(page, _mapcount);
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VMCOREINFO_OFFSET(page, private);
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VMCOREINFO_OFFSET(page, compound_dtor);
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VMCOREINFO_OFFSET(page, compound_order);
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VMCOREINFO_OFFSET(page, compound_head);
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VMCOREINFO_OFFSET(pglist_data, node_zones);
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VMCOREINFO_OFFSET(pglist_data, nr_zones);
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#ifdef CONFIG_FLAT_NODE_MEM_MAP
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VMCOREINFO_OFFSET(pglist_data, node_mem_map);
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#endif
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VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
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VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
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VMCOREINFO_OFFSET(pglist_data, node_id);
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VMCOREINFO_OFFSET(zone, free_area);
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VMCOREINFO_OFFSET(zone, vm_stat);
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VMCOREINFO_OFFSET(zone, spanned_pages);
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VMCOREINFO_OFFSET(free_area, free_list);
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VMCOREINFO_OFFSET(list_head, next);
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VMCOREINFO_OFFSET(list_head, prev);
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VMCOREINFO_OFFSET(vmap_area, va_start);
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VMCOREINFO_OFFSET(vmap_area, list);
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VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
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log_buf_vmcoreinfo_setup();
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VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
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VMCOREINFO_NUMBER(NR_FREE_PAGES);
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VMCOREINFO_NUMBER(PG_lru);
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VMCOREINFO_NUMBER(PG_private);
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VMCOREINFO_NUMBER(PG_swapcache);
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VMCOREINFO_NUMBER(PG_slab);
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#ifdef CONFIG_MEMORY_FAILURE
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VMCOREINFO_NUMBER(PG_hwpoison);
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#endif
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VMCOREINFO_NUMBER(PG_head_mask);
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VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
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#ifdef CONFIG_HUGETLB_PAGE
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VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
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#endif
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arch_crash_save_vmcoreinfo();
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update_vmcoreinfo_note();
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return 0;
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}
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subsys_initcall(crash_save_vmcoreinfo_init);
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