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

#include <crypto/sha1.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;

	/* 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);
	}

	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;
}

/*
 * 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

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