[linux-2.6-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/crash_core.h>
#include <linux/utsname.h>
#include <linux/vmalloc.h>

#include <asm/page.h>
#include <asm/sections.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);
	}

	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=%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_PAGESIZE(PAGE_SIZE);

	VMCOREINFO_SYMBOL(init_uts_ns);
	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_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_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	*/
	6
	7	#include <linux/crash_core.h>
	8	#include <linux/utsname.h>
	9	#include <linux/vmalloc.h>
	10
	11	#include <asm/page.h>
	12	#include <asm/sections.h>
	13
	14	/* vmcoreinfo stuff */
23c85094 OS	15	unsigned char *vmcoreinfo_data;
23c85094 OS	16	size_t vmcoreinfo_size;
203e9e41	17	u32 *vmcoreinfo_note;
692f66f2	18
1229384f XP	19	/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
	20	static unsigned char *vmcoreinfo_data_safecopy;
	21
692f66f2 HB	22	/*
	23	* parsing the "crashkernel" commandline
	24	*
	25	* this code is intended to be called from architecture specific code
	26	*/
	27
	28
	29	/*
	30	* This function parses command lines in the format
	31	*
	32	* crashkernel=ramsize-range:size[,...][@offset]
	33	*
	34	* The function returns 0 on success and -EINVAL on failure.
	35	*/
	36	static int __init parse_crashkernel_mem(char *cmdline,
	37	unsigned long long system_ram,
	38	unsigned long long *crash_size,
	39	unsigned long long *crash_base)
	40	{
	41	char cur = cmdline, tmp;
	42
	43	/* for each entry of the comma-separated list */
	44	do {
	45	unsigned long long start, end = ULLONG_MAX, size;
	46
	47	/* get the start of the range */
	48	start = memparse(cur, &tmp);
	49	if (cur == tmp) {
	50	pr_warn("crashkernel: Memory value expected\n");
	51	return -EINVAL;
	52	}
	53	cur = tmp;
	54	if (*cur != '-') {
	55	pr_warn("crashkernel: '-' expected\n");
	56	return -EINVAL;
	57	}
	58	cur++;
	59
	60	/* if no ':' is here, than we read the end */
	61	if (*cur != ':') {
	62	end = memparse(cur, &tmp);
	63	if (cur == tmp) {
	64	pr_warn("crashkernel: Memory value expected\n");
	65	return -EINVAL;
	66	}
	67	cur = tmp;
	68	if (end <= start) {
	69	pr_warn("crashkernel: end <= start\n");
	70	return -EINVAL;
	71	}
	72	}
	73
	74	if (*cur != ':') {
	75	pr_warn("crashkernel: ':' expected\n");
	76	return -EINVAL;
	77	}
	78	cur++;
	79
	80	size = memparse(cur, &tmp);
	81	if (cur == tmp) {
	82	pr_warn("Memory value expected\n");
	83	return -EINVAL;
	84	}
	85	cur = tmp;
86	if (size >= system_ram) {
87	pr_warn("crashkernel: invalid size\n");
88	return -EINVAL;
89	}
90
91	/* match ? */
92	if (system_ram >= start && system_ram < end) {
93	*crash_size = size;
94	break;
95	}
96	} while (*cur++ == ',');
97
98	if (*crash_size > 0) {
99	while (cur && cur != ' ' && *cur != '@')
100	cur++;
101	if (*cur == '@') {
102	cur++;
103	*crash_base = memparse(cur, &tmp);
104	if (cur == tmp) {
105	pr_warn("Memory value expected after '@'\n");
106	return -EINVAL;
107	}
108	}
de40ccef DY	109	} else
de40ccef DY	110	pr_info("crashkernel size resulted in zero bytes\n");
692f66f2 HB	111
	112	return 0;
	113	}
	114
	115	/*
	116	* That function parses "simple" (old) crashkernel command lines like
	117	*
	118	* crashkernel=size[@offset]
	119	*
	120	* It returns 0 on success and -EINVAL on failure.
	121	*/
	122	static int __init parse_crashkernel_simple(char *cmdline,
	123	unsigned long long *crash_size,
	124	unsigned long long *crash_base)
	125	{
	126	char *cur = cmdline;
	127
	128	*crash_size = memparse(cmdline, &cur);
	129	if (cmdline == cur) {
	130	pr_warn("crashkernel: memory value expected\n");
	131	return -EINVAL;
	132	}
	133
	134	if (*cur == '@')
	135	*crash_base = memparse(cur+1, &cur);
	136	else if (cur != ' ' && cur != '\0') {
	137	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
	138	return -EINVAL;
	139	}
	140
	141	return 0;
	142	}
	143
	144	#define SUFFIX_HIGH 0
	145	#define SUFFIX_LOW 1
	146	#define SUFFIX_NULL 2
	147	static __initdata char *suffix_tbl[] = {
	148	[SUFFIX_HIGH] = ",high",
	149	[SUFFIX_LOW] = ",low",
	150	[SUFFIX_NULL] = NULL,
	151	};
	152
	153	/*
	154	* That function parses "suffix" crashkernel command lines like
	155	*
	156	* crashkernel=size,[high\|low]
	157	*
	158	* It returns 0 on success and -EINVAL on failure.
	159	*/
	160	static int __init parse_crashkernel_suffix(char *cmdline,
	161	unsigned long long *crash_size,
	162	const char *suffix)
	163	{
	164	char *cur = cmdline;
	165
	166	*crash_size = memparse(cmdline, &cur);
	167	if (cmdline == cur) {
	168	pr_warn("crashkernel: memory value expected\n");
	169	return -EINVAL;
	170	}
	171
	172	/* check with suffix */
	173	if (strncmp(cur, suffix, strlen(suffix))) {
	174	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
175	return -EINVAL;
176	}
177	cur += strlen(suffix);
178	if (cur != ' ' && cur != '\0') {
179	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
180	return -EINVAL;
181	}
182
183	return 0;
184	}
185
186	static __init char get_last_crashkernel(char cmdline,
187	const char *name,
188	const char *suffix)
189	{
190	char p = cmdline, ck_cmdline = NULL;
191
192	/* find crashkernel and use the last one if there are more */
193	p = strstr(p, name);
194	while (p) {
195	char *end_p = strchr(p, ' ');
196	char *q;
197
198	if (!end_p)
199	end_p = p + strlen(p);
200
201	if (!suffix) {
202	int i;
203
204	/* skip the one with any known suffix */
205	for (i = 0; suffix_tbl[i]; i++) {
206	q = end_p - strlen(suffix_tbl[i]);
207	if (!strncmp(q, suffix_tbl[i],
208	strlen(suffix_tbl[i])))
209	goto next;
210	}
211	ck_cmdline = p;
212	} else {
213	q = end_p - strlen(suffix);
214	if (!strncmp(q, suffix, strlen(suffix)))
215	ck_cmdline = p;
216	}
217	next:
218	p = strstr(p+1, name);
219	}
220
221	if (!ck_cmdline)
222	return NULL;
223
224	return ck_cmdline;
225	}
226
227	static int __init __parse_crashkernel(char *cmdline,
228	unsigned long long system_ram,
229	unsigned long long *crash_size,
230	unsigned long long *crash_base,
231	const char *name,
232	const char *suffix)
233	{
234	char first_colon, first_space;
235	char *ck_cmdline;
236
237	BUG_ON(!crash_size \|\| !crash_base);
238	*crash_size = 0;
239	*crash_base = 0;
240
241	ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
242
243	if (!ck_cmdline)
244	return -EINVAL;
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
51dbd925 HB	295	Elf_Word append_elf_note(Elf_Word buf, char *name, unsigned int type,
51dbd925 HB	296	void *data, size_t data_len)
692f66f2	297	{
51dbd925 HB	298	struct elf_note note = (struct elf_note )buf;
	299
	300	note->n_namesz = strlen(name) + 1;
	301	note->n_descsz = data_len;
	302	note->n_type = type;
	303	buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
	304	memcpy(buf, name, note->n_namesz);
	305	buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
	306	memcpy(buf, data, data_len);
	307	buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
692f66f2 HB	308
	309	return buf;
	310	}
	311
51dbd925	312	void final_note(Elf_Word *buf)
692f66f2	313	{
51dbd925	314	memset(buf, 0, sizeof(struct elf_note));
692f66f2 HB	315	}
	316
	317	static void update_vmcoreinfo_note(void)
	318	{
	319	u32 *buf = vmcoreinfo_note;
	320
	321	if (!vmcoreinfo_size)
	322	return;
	323	buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
	324	vmcoreinfo_size);
	325	final_note(buf);
	326	}
	327
1229384f XP	328	void crash_update_vmcoreinfo_safecopy(void *ptr)
	329	{
	330	if (ptr)
	331	memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
	332
	333	vmcoreinfo_data_safecopy = ptr;
	334	}
	335
692f66f2 HB	336	void crash_save_vmcoreinfo(void)
692f66f2 HB	337	{
203e9e41 XP	338	if (!vmcoreinfo_note)
	339	return;
	340
1229384f XP	341	/* Use the safe copy to generate vmcoreinfo note if have */
	342	if (vmcoreinfo_data_safecopy)
	343	vmcoreinfo_data = vmcoreinfo_data_safecopy;
	344
91bc9aaf	345	vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds());
692f66f2 HB	346	update_vmcoreinfo_note();
	347	}
	348
	349	void vmcoreinfo_append_str(const char *fmt, ...)
	350	{
	351	va_list args;
	352	char buf[0x50];
	353	size_t r;
	354
	355	va_start(args, fmt);
	356	r = vscnprintf(buf, sizeof(buf), fmt, args);
	357	va_end(args);
	358
5203f499	359	r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
692f66f2 HB	360
	361	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
	362
	363	vmcoreinfo_size += r;
	364	}
	365
	366	/*
	367	* provide an empty default implementation here -- architecture
	368	* code may override this
	369	*/
	370	void __weak arch_crash_save_vmcoreinfo(void)
	371	{}
	372
	373	phys_addr_t __weak paddr_vmcoreinfo_note(void)
	374	{
203e9e41	375	return __pa(vmcoreinfo_note);
692f66f2	376	}
43d4cb47	377	EXPORT_SYMBOL(paddr_vmcoreinfo_note);
692f66f2 HB	378
	379	static int __init crash_save_vmcoreinfo_init(void)
	380	{
203e9e41 XP	381	vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
	382	if (!vmcoreinfo_data) {
	383	pr_warn("Memory allocation for vmcoreinfo_data failed\n");
	384	return -ENOMEM;
	385	}
	386
	387	vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
	388	GFP_KERNEL \| __GFP_ZERO);
	389	if (!vmcoreinfo_note) {
	390	free_page((unsigned long)vmcoreinfo_data);
	391	vmcoreinfo_data = NULL;
	392	pr_warn("Memory allocation for vmcoreinfo_note failed\n");
	393	return -ENOMEM;
	394	}
	395
692f66f2 HB	396	VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
	397	VMCOREINFO_PAGESIZE(PAGE_SIZE);
	398
	399	VMCOREINFO_SYMBOL(init_uts_ns);
	400	VMCOREINFO_SYMBOL(node_online_map);
	401	#ifdef CONFIG_MMU
eff4345e	402	VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
692f66f2 HB	403	#endif
	404	VMCOREINFO_SYMBOL(_stext);
	405	VMCOREINFO_SYMBOL(vmap_area_list);
	406
	407	#ifndef CONFIG_NEED_MULTIPLE_NODES
	408	VMCOREINFO_SYMBOL(mem_map);
	409	VMCOREINFO_SYMBOL(contig_page_data);
	410	#endif
	411	#ifdef CONFIG_SPARSEMEM
a0b12803	412	VMCOREINFO_SYMBOL_ARRAY(mem_section);
692f66f2 HB	413	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
	414	VMCOREINFO_STRUCT_SIZE(mem_section);
	415	VMCOREINFO_OFFSET(mem_section, section_mem_map);
	416	#endif
	417	VMCOREINFO_STRUCT_SIZE(page);
	418	VMCOREINFO_STRUCT_SIZE(pglist_data);
	419	VMCOREINFO_STRUCT_SIZE(zone);
	420	VMCOREINFO_STRUCT_SIZE(free_area);
	421	VMCOREINFO_STRUCT_SIZE(list_head);
	422	VMCOREINFO_SIZE(nodemask_t);
	423	VMCOREINFO_OFFSET(page, flags);
	424	VMCOREINFO_OFFSET(page, _refcount);
	425	VMCOREINFO_OFFSET(page, mapping);
	426	VMCOREINFO_OFFSET(page, lru);
	427	VMCOREINFO_OFFSET(page, _mapcount);
	428	VMCOREINFO_OFFSET(page, private);
	429	VMCOREINFO_OFFSET(page, compound_dtor);
	430	VMCOREINFO_OFFSET(page, compound_order);
	431	VMCOREINFO_OFFSET(page, compound_head);
	432	VMCOREINFO_OFFSET(pglist_data, node_zones);
	433	VMCOREINFO_OFFSET(pglist_data, nr_zones);
	434	#ifdef CONFIG_FLAT_NODE_MEM_MAP
	435	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
	436	#endif
	437	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
	438	VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
	439	VMCOREINFO_OFFSET(pglist_data, node_id);
	440	VMCOREINFO_OFFSET(zone, free_area);
	441	VMCOREINFO_OFFSET(zone, vm_stat);
	442	VMCOREINFO_OFFSET(zone, spanned_pages);
	443	VMCOREINFO_OFFSET(free_area, free_list);
	444	VMCOREINFO_OFFSET(list_head, next);
	445	VMCOREINFO_OFFSET(list_head, prev);
	446	VMCOREINFO_OFFSET(vmap_area, va_start);
	447	VMCOREINFO_OFFSET(vmap_area, list);
	448	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
	449	log_buf_vmcoreinfo_setup();
	450	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
	451	VMCOREINFO_NUMBER(NR_FREE_PAGES);
	452	VMCOREINFO_NUMBER(PG_lru);
	453	VMCOREINFO_NUMBER(PG_private);
	454	VMCOREINFO_NUMBER(PG_swapcache);
1cbf29da	455	VMCOREINFO_NUMBER(PG_swapbacked);
692f66f2 HB	456	VMCOREINFO_NUMBER(PG_slab);
	457	#ifdef CONFIG_MEMORY_FAILURE
	458	VMCOREINFO_NUMBER(PG_hwpoison);
	459	#endif
	460	VMCOREINFO_NUMBER(PG_head_mask);
6e292b9b	461	#define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy)
692f66f2 HB	462	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
	463	#ifdef CONFIG_HUGETLB_PAGE
	464	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
e04b742f DH	465	#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
e04b742f DH	466	VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
692f66f2 HB	467	#endif
	468
	469	arch_crash_save_vmcoreinfo();
	470	update_vmcoreinfo_note();
	471
	472	return 0;
	473	}
	474
	475	subsys_initcall(crash_save_vmcoreinfo_init);