[linux-block.git] / kernel / crash_core.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * crash.c - kernel crash support code.
 * Copyright (C) 2002-2004 Eric Biederman  <ebiederm@xmission.com>
 */

#include <linux/buildid.h>
#include <linux/crash_core.h>
#include <linux/init.h>
#include <linux/utsname.h>
#include <linux/vmalloc.h>
#include <linux/sizes.h>

#include <asm/page.h>
#include <asm/sections.h>

#include <crypto/sha1.h>

#include "kallsyms_internal.h"

/* vmcoreinfo stuff */
unsigned char *vmcoreinfo_data;
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;
	unsigned long long total_mem = system_ram;

	/*
	 * Firmware sometimes reserves some memory regions for its own use,
	 * so the system memory size is less than the actual physical memory
	 * size. Work around this by rounding up the total size to 128M,
	 * which is enough for most test cases.
	 */
	total_mem = roundup(total_mem, SZ_128M);

	/* 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 >= total_mem) {
			pr_warn("crashkernel: invalid size\n");
			return -EINVAL;
		}

		/* match ? */
		if (total_mem >= start && total_mem < 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);
	}

	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 -ENOENT;

	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]);
}

/*
 * Add a dummy early_param handler to mark crashkernel= as a known command line
 * parameter and suppress incorrect warnings in init/main.c.
 */
static int __init parse_crashkernel_dummy(char *arg)
{
	return 0;
}
early_param("crashkernel", parse_crashkernel_dummy);

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=%lld\n", ktime_get_real_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;

	WARN_ONCE(vmcoreinfo_size == VMCOREINFO_BYTES,
		  "vmcoreinfo data exceeds allocated size, truncating");
}

/*
 * 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);
}
EXPORT_SYMBOL(paddr_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_BUILD_ID();
	VMCOREINFO_PAGESIZE(PAGE_SIZE);

	VMCOREINFO_SYMBOL(init_uts_ns);
	VMCOREINFO_OFFSET(uts_namespace, name);
	VMCOREINFO_SYMBOL(node_online_map);
#ifdef CONFIG_MMU
	VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
#endif
	VMCOREINFO_SYMBOL(_stext);
	VMCOREINFO_SYMBOL(vmap_area_list);

#ifndef CONFIG_NUMA
	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);
	VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
	VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
#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_FLATMEM
	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_swapbacked);
	VMCOREINFO_NUMBER(PG_slab);
#ifdef CONFIG_MEMORY_FAILURE
	VMCOREINFO_NUMBER(PG_hwpoison);
#endif
	VMCOREINFO_NUMBER(PG_head_mask);
#define PAGE_BUDDY_MAPCOUNT_VALUE	(~PG_buddy)
	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
#ifdef CONFIG_HUGETLB_PAGE
	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
#define PAGE_OFFLINE_MAPCOUNT_VALUE	(~PG_offline)
	VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
#endif

#ifdef CONFIG_KALLSYMS
	VMCOREINFO_SYMBOL(kallsyms_names);
	VMCOREINFO_SYMBOL(kallsyms_num_syms);
	VMCOREINFO_SYMBOL(kallsyms_token_table);
	VMCOREINFO_SYMBOL(kallsyms_token_index);
#ifdef CONFIG_KALLSYMS_BASE_RELATIVE
	VMCOREINFO_SYMBOL(kallsyms_offsets);
	VMCOREINFO_SYMBOL(kallsyms_relative_base);
#else
	VMCOREINFO_SYMBOL(kallsyms_addresses);
#endif /* CONFIG_KALLSYMS_BASE_RELATIVE */
#endif /* CONFIG_KALLSYMS */

	arch_crash_save_vmcoreinfo();
	update_vmcoreinfo_note();

	return 0;
}

subsys_initcall(crash_save_vmcoreinfo_init);
Commit	Line	Data
40b0b3f8	1	// SPDX-License-Identifier: GPL-2.0-only
692f66f2 HB	2	/*
	3	* crash.c - kernel crash support code.
	4	* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
692f66f2 HB	5	*/
692f66f2 HB	6
44e8a5e9	7	#include <linux/buildid.h>
692f66f2	8	#include <linux/crash_core.h>
71d2bcec	9	#include <linux/init.h>
692f66f2 HB	10	#include <linux/utsname.h>
692f66f2 HB	11	#include <linux/vmalloc.h>
46d36b1b	12	#include <linux/sizes.h>
692f66f2 HB	13
	14	#include <asm/page.h>
	15	#include <asm/sections.h>
	16
a24d22b2	17	#include <crypto/sha1.h>
0935288c	18
5fd8fea9 SB	19	#include "kallsyms_internal.h"
5fd8fea9 SB	20
692f66f2	21	/* vmcoreinfo stuff */
23c85094 OS	22	unsigned char *vmcoreinfo_data;
23c85094 OS	23	size_t vmcoreinfo_size;
203e9e41	24	u32 *vmcoreinfo_note;
692f66f2	25
1229384f XP	26	/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
	27	static unsigned char *vmcoreinfo_data_safecopy;
	28
692f66f2 HB	29	/*
	30	* parsing the "crashkernel" commandline
	31	*
	32	* this code is intended to be called from architecture specific code
	33	*/
	34
	35
	36	/*
	37	* This function parses command lines in the format
	38	*
	39	* crashkernel=ramsize-range:size[,...][@offset]
	40	*
	41	* The function returns 0 on success and -EINVAL on failure.
	42	*/
	43	static int __init parse_crashkernel_mem(char *cmdline,
	44	unsigned long long system_ram,
	45	unsigned long long *crash_size,
	46	unsigned long long *crash_base)
	47	{
	48	char cur = cmdline, tmp;
46d36b1b TL	49	unsigned long long total_mem = system_ram;
	50
	51	/*
	52	* Firmware sometimes reserves some memory regions for its own use,
	53	* so the system memory size is less than the actual physical memory
	54	* size. Work around this by rounding up the total size to 128M,
	55	* which is enough for most test cases.
	56	*/
	57	total_mem = roundup(total_mem, SZ_128M);
692f66f2 HB	58
	59	/* for each entry of the comma-separated list */
	60	do {
	61	unsigned long long start, end = ULLONG_MAX, size;
	62
	63	/* get the start of the range */
	64	start = memparse(cur, &tmp);
	65	if (cur == tmp) {
	66	pr_warn("crashkernel: Memory value expected\n");
	67	return -EINVAL;
	68	}
	69	cur = tmp;
	70	if (*cur != '-') {
	71	pr_warn("crashkernel: '-' expected\n");
	72	return -EINVAL;
	73	}
	74	cur++;
	75
	76	/* if no ':' is here, than we read the end */
	77	if (*cur != ':') {
	78	end = memparse(cur, &tmp);
	79	if (cur == tmp) {
	80	pr_warn("crashkernel: Memory value expected\n");
	81	return -EINVAL;
	82	}
	83	cur = tmp;
	84	if (end <= start) {
	85	pr_warn("crashkernel: end <= start\n");
	86	return -EINVAL;
	87	}
	88	}
	89
	90	if (*cur != ':') {
	91	pr_warn("crashkernel: ':' expected\n");
	92	return -EINVAL;
	93	}
	94	cur++;
	95
	96	size = memparse(cur, &tmp);
	97	if (cur == tmp) {
	98	pr_warn("Memory value expected\n");
	99	return -EINVAL;
	100	}
	101	cur = tmp;
46d36b1b	102	if (size >= total_mem) {
692f66f2 HB	103	pr_warn("crashkernel: invalid size\n");
	104	return -EINVAL;
	105	}
	106
	107	/* match ? */
46d36b1b	108	if (total_mem >= start && total_mem < end) {
692f66f2 HB	109	*crash_size = size;
	110	break;
	111	}
	112	} while (*cur++ == ',');
	113
	114	if (*crash_size > 0) {
	115	while (cur && cur != ' ' && *cur != '@')
	116	cur++;
	117	if (*cur == '@') {
	118	cur++;
	119	*crash_base = memparse(cur, &tmp);
	120	if (cur == tmp) {
	121	pr_warn("Memory value expected after '@'\n");
	122	return -EINVAL;
	123	}
	124	}
de40ccef DY	125	} else
de40ccef DY	126	pr_info("crashkernel size resulted in zero bytes\n");
692f66f2 HB	127
	128	return 0;
	129	}
	130
	131	/*
	132	* That function parses "simple" (old) crashkernel command lines like
	133	*
	134	* crashkernel=size[@offset]
	135	*
	136	* It returns 0 on success and -EINVAL on failure.
	137	*/
	138	static int __init parse_crashkernel_simple(char *cmdline,
	139	unsigned long long *crash_size,
	140	unsigned long long *crash_base)
	141	{
	142	char *cur = cmdline;
	143
	144	*crash_size = memparse(cmdline, &cur);
	145	if (cmdline == cur) {
	146	pr_warn("crashkernel: memory value expected\n");
	147	return -EINVAL;
	148	}
	149
	150	if (*cur == '@')
	151	*crash_base = memparse(cur+1, &cur);
	152	else if (cur != ' ' && cur != '\0') {
	153	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
	154	return -EINVAL;
	155	}
	156
	157	return 0;
	158	}
	159
	160	#define SUFFIX_HIGH 0
	161	#define SUFFIX_LOW 1
	162	#define SUFFIX_NULL 2
	163	static __initdata char *suffix_tbl[] = {
	164	[SUFFIX_HIGH] = ",high",
	165	[SUFFIX_LOW] = ",low",
	166	[SUFFIX_NULL] = NULL,
	167	};
	168
	169	/*
	170	* That function parses "suffix" crashkernel command lines like
	171	*
	172	* crashkernel=size,[high\|low]
	173	*
	174	* It returns 0 on success and -EINVAL on failure.
	175	*/
	176	static int __init parse_crashkernel_suffix(char *cmdline,
	177	unsigned long long *crash_size,
	178	const char *suffix)
	179	{
	180	char *cur = cmdline;
	181
	182	*crash_size = memparse(cmdline, &cur);
	183	if (cmdline == cur) {
	184	pr_warn("crashkernel: memory value expected\n");
	185	return -EINVAL;
	186	}
	187
	188	/* check with suffix */
	189	if (strncmp(cur, suffix, strlen(suffix))) {
	190	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
191	return -EINVAL;
192	}
193	cur += strlen(suffix);
194	if (cur != ' ' && cur != '\0') {
195	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
196	return -EINVAL;
197	}
198
199	return 0;
200	}
201
202	static __init char get_last_crashkernel(char cmdline,
203	const char *name,
204	const char *suffix)
205	{
206	char p = cmdline, ck_cmdline = NULL;
207
208	/* find crashkernel and use the last one if there are more */
209	p = strstr(p, name);
210	while (p) {
211	char *end_p = strchr(p, ' ');
212	char *q;
213
214	if (!end_p)
215	end_p = p + strlen(p);
216
217	if (!suffix) {
218	int i;
219
220	/* skip the one with any known suffix */
221	for (i = 0; suffix_tbl[i]; i++) {
222	q = end_p - strlen(suffix_tbl[i]);
223	if (!strncmp(q, suffix_tbl[i],
224	strlen(suffix_tbl[i])))
225	goto next;
226	}
227	ck_cmdline = p;
228	} else {
229	q = end_p - strlen(suffix);
230	if (!strncmp(q, suffix, strlen(suffix)))
231	ck_cmdline = p;
232	}
233	next:
234	p = strstr(p+1, name);
235	}
236
692f66f2 HB	237	return ck_cmdline;
	238	}
	239
	240	static int __init __parse_crashkernel(char *cmdline,
	241	unsigned long long system_ram,
	242	unsigned long long *crash_size,
	243	unsigned long long *crash_base,
	244	const char *name,
	245	const char *suffix)
	246	{
	247	char first_colon, first_space;
	248	char *ck_cmdline;
	249
	250	BUG_ON(!crash_size \|\| !crash_base);
	251	*crash_size = 0;
	252	*crash_base = 0;
	253
	254	ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
692f66f2	255	if (!ck_cmdline)
2e5920bb	256	return -ENOENT;
692f66f2 HB	257
	258	ck_cmdline += strlen(name);
	259
	260	if (suffix)
	261	return parse_crashkernel_suffix(ck_cmdline, crash_size,
	262	suffix);
	263	/*
	264	* if the commandline contains a ':', then that's the extended
	265	* syntax -- if not, it must be the classic syntax
	266	*/
	267	first_colon = strchr(ck_cmdline, ':');
	268	first_space = strchr(ck_cmdline, ' ');
	269	if (first_colon && (!first_space \|\| first_colon < first_space))
	270	return parse_crashkernel_mem(ck_cmdline, system_ram,
	271	crash_size, crash_base);
	272
	273	return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
	274	}
	275
	276	/*
	277	* That function is the entry point for command line parsing and should be
	278	* called from the arch-specific code.
	279	*/
	280	int __init parse_crashkernel(char *cmdline,
	281	unsigned long long system_ram,
	282	unsigned long long *crash_size,
	283	unsigned long long *crash_base)
	284	{
	285	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
	286	"crashkernel=", NULL);
	287	}
	288
	289	int __init parse_crashkernel_high(char *cmdline,
	290	unsigned long long system_ram,
	291	unsigned long long *crash_size,
	292	unsigned long long *crash_base)
	293	{
	294	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
	295	"crashkernel=", suffix_tbl[SUFFIX_HIGH]);
	296	}
	297
	298	int __init parse_crashkernel_low(char *cmdline,
	299	unsigned long long system_ram,
	300	unsigned long long *crash_size,
	301	unsigned long long *crash_base)
	302	{
	303	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
	304	"crashkernel=", suffix_tbl[SUFFIX_LOW]);
	305	}
	306
71d2bcec PR	307	/*
	308	* Add a dummy early_param handler to mark crashkernel= as a known command line
	309	* parameter and suppress incorrect warnings in init/main.c.
	310	*/
	311	static int __init parse_crashkernel_dummy(char *arg)
	312	{
	313	return 0;
	314	}
	315	early_param("crashkernel", parse_crashkernel_dummy);
	316
51dbd925 HB	317	Elf_Word append_elf_note(Elf_Word buf, char *name, unsigned int type,
51dbd925 HB	318	void *data, size_t data_len)
692f66f2	319	{
51dbd925 HB	320	struct elf_note note = (struct elf_note )buf;
	321
	322	note->n_namesz = strlen(name) + 1;
	323	note->n_descsz = data_len;
	324	note->n_type = type;
	325	buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
	326	memcpy(buf, name, note->n_namesz);
	327	buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
	328	memcpy(buf, data, data_len);
	329	buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
692f66f2 HB	330
	331	return buf;
	332	}
	333
51dbd925	334	void final_note(Elf_Word *buf)
692f66f2	335	{
51dbd925	336	memset(buf, 0, sizeof(struct elf_note));
692f66f2 HB	337	}
	338
	339	static void update_vmcoreinfo_note(void)
	340	{
	341	u32 *buf = vmcoreinfo_note;
	342
	343	if (!vmcoreinfo_size)
	344	return;
	345	buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
	346	vmcoreinfo_size);
	347	final_note(buf);
	348	}
	349
1229384f XP	350	void crash_update_vmcoreinfo_safecopy(void *ptr)
	351	{
	352	if (ptr)
	353	memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
	354
	355	vmcoreinfo_data_safecopy = ptr;
	356	}
	357
692f66f2 HB	358	void crash_save_vmcoreinfo(void)
692f66f2 HB	359	{
203e9e41 XP	360	if (!vmcoreinfo_note)
	361	return;
	362
1229384f XP	363	/* Use the safe copy to generate vmcoreinfo note if have */
	364	if (vmcoreinfo_data_safecopy)
	365	vmcoreinfo_data = vmcoreinfo_data_safecopy;
	366
91bc9aaf	367	vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds());
692f66f2 HB	368	update_vmcoreinfo_note();
	369	}
	370
	371	void vmcoreinfo_append_str(const char *fmt, ...)
	372	{
	373	va_list args;
	374	char buf[0x50];
	375	size_t r;
	376
	377	va_start(args, fmt);
	378	r = vscnprintf(buf, sizeof(buf), fmt, args);
	379	va_end(args);
	380
5203f499	381	r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
692f66f2 HB	382
	383	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
	384
	385	vmcoreinfo_size += r;
08fc35f3 SB	386
	387	WARN_ONCE(vmcoreinfo_size == VMCOREINFO_BYTES,
	388	"vmcoreinfo data exceeds allocated size, truncating");
692f66f2 HB	389	}
	390
	391	/*
	392	* provide an empty default implementation here -- architecture
	393	* code may override this
	394	*/
	395	void __weak arch_crash_save_vmcoreinfo(void)
	396	{}
	397
	398	phys_addr_t __weak paddr_vmcoreinfo_note(void)
	399	{
203e9e41	400	return __pa(vmcoreinfo_note);
692f66f2	401	}
43d4cb47	402	EXPORT_SYMBOL(paddr_vmcoreinfo_note);
692f66f2 HB	403
	404	static int __init crash_save_vmcoreinfo_init(void)
	405	{
203e9e41 XP	406	vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
	407	if (!vmcoreinfo_data) {
	408	pr_warn("Memory allocation for vmcoreinfo_data failed\n");
	409	return -ENOMEM;
	410	}
	411
	412	vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
	413	GFP_KERNEL \| __GFP_ZERO);
	414	if (!vmcoreinfo_note) {
	415	free_page((unsigned long)vmcoreinfo_data);
	416	vmcoreinfo_data = NULL;
	417	pr_warn("Memory allocation for vmcoreinfo_note failed\n");
	418	return -ENOMEM;
	419	}
	420
692f66f2	421	VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
44e8a5e9	422	VMCOREINFO_BUILD_ID();
692f66f2 HB	423	VMCOREINFO_PAGESIZE(PAGE_SIZE);
	424
	425	VMCOREINFO_SYMBOL(init_uts_ns);
ca4a9241	426	VMCOREINFO_OFFSET(uts_namespace, name);
692f66f2 HB	427	VMCOREINFO_SYMBOL(node_online_map);
692f66f2 HB	428	#ifdef CONFIG_MMU
eff4345e	429	VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
692f66f2 HB	430	#endif
	431	VMCOREINFO_SYMBOL(_stext);
	432	VMCOREINFO_SYMBOL(vmap_area_list);
	433
a9ee6cf5	434	#ifndef CONFIG_NUMA
692f66f2 HB	435	VMCOREINFO_SYMBOL(mem_map);
	436	VMCOREINFO_SYMBOL(contig_page_data);
	437	#endif
	438	#ifdef CONFIG_SPARSEMEM
a0b12803	439	VMCOREINFO_SYMBOL_ARRAY(mem_section);
692f66f2 HB	440	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
	441	VMCOREINFO_STRUCT_SIZE(mem_section);
	442	VMCOREINFO_OFFSET(mem_section, section_mem_map);
4f5aecdf	443	VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
1d50e5d0	444	VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
692f66f2 HB	445	#endif
	446	VMCOREINFO_STRUCT_SIZE(page);
	447	VMCOREINFO_STRUCT_SIZE(pglist_data);
	448	VMCOREINFO_STRUCT_SIZE(zone);
	449	VMCOREINFO_STRUCT_SIZE(free_area);
	450	VMCOREINFO_STRUCT_SIZE(list_head);
	451	VMCOREINFO_SIZE(nodemask_t);
	452	VMCOREINFO_OFFSET(page, flags);
	453	VMCOREINFO_OFFSET(page, _refcount);
	454	VMCOREINFO_OFFSET(page, mapping);
	455	VMCOREINFO_OFFSET(page, lru);
	456	VMCOREINFO_OFFSET(page, _mapcount);
	457	VMCOREINFO_OFFSET(page, private);
	458	VMCOREINFO_OFFSET(page, compound_dtor);
	459	VMCOREINFO_OFFSET(page, compound_order);
	460	VMCOREINFO_OFFSET(page, compound_head);
	461	VMCOREINFO_OFFSET(pglist_data, node_zones);
	462	VMCOREINFO_OFFSET(pglist_data, nr_zones);
43b02ba9	463	#ifdef CONFIG_FLATMEM
692f66f2 HB	464	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
	465	#endif
	466	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
	467	VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
	468	VMCOREINFO_OFFSET(pglist_data, node_id);
	469	VMCOREINFO_OFFSET(zone, free_area);
	470	VMCOREINFO_OFFSET(zone, vm_stat);
	471	VMCOREINFO_OFFSET(zone, spanned_pages);
	472	VMCOREINFO_OFFSET(free_area, free_list);
	473	VMCOREINFO_OFFSET(list_head, next);
	474	VMCOREINFO_OFFSET(list_head, prev);
	475	VMCOREINFO_OFFSET(vmap_area, va_start);
	476	VMCOREINFO_OFFSET(vmap_area, list);
	477	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
	478	log_buf_vmcoreinfo_setup();
	479	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
	480	VMCOREINFO_NUMBER(NR_FREE_PAGES);
	481	VMCOREINFO_NUMBER(PG_lru);
	482	VMCOREINFO_NUMBER(PG_private);
	483	VMCOREINFO_NUMBER(PG_swapcache);
1cbf29da	484	VMCOREINFO_NUMBER(PG_swapbacked);
692f66f2 HB	485	VMCOREINFO_NUMBER(PG_slab);
	486	#ifdef CONFIG_MEMORY_FAILURE
	487	VMCOREINFO_NUMBER(PG_hwpoison);
	488	#endif
	489	VMCOREINFO_NUMBER(PG_head_mask);
6e292b9b	490	#define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy)
692f66f2 HB	491	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
	492	#ifdef CONFIG_HUGETLB_PAGE
	493	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
e04b742f DH	494	#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
e04b742f DH	495	VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
692f66f2 HB	496	#endif
692f66f2 HB	497
5fd8fea9 SB	498	#ifdef CONFIG_KALLSYMS
5fd8fea9 SB	499	VMCOREINFO_SYMBOL(kallsyms_names);
f09bddbd	500	VMCOREINFO_SYMBOL(kallsyms_num_syms);
5fd8fea9 SB	501	VMCOREINFO_SYMBOL(kallsyms_token_table);
	502	VMCOREINFO_SYMBOL(kallsyms_token_index);
	503	#ifdef CONFIG_KALLSYMS_BASE_RELATIVE
	504	VMCOREINFO_SYMBOL(kallsyms_offsets);
	505	VMCOREINFO_SYMBOL(kallsyms_relative_base);
	506	#else
	507	VMCOREINFO_SYMBOL(kallsyms_addresses);
	508	#endif /* CONFIG_KALLSYMS_BASE_RELATIVE */
	509	#endif /* CONFIG_KALLSYMS */
	510
692f66f2 HB	511	arch_crash_save_vmcoreinfo();
	512	update_vmcoreinfo_note();
	513
	514	return 0;
	515	}
	516
	517	subsys_initcall(crash_save_vmcoreinfo_init);