[linux-2.6-block.git] / kernel / crash_core.c

/*
 * crash.c - kernel crash support code.
 * Copyright (C) 2002-2004 Eric Biederman  <ebiederm@xmission.com>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/crash_core.h>
#include <linux/utsname.h>
#include <linux/vmalloc.h>

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

/* vmcoreinfo stuff */
static unsigned char *vmcoreinfo_data;
size_t vmcoreinfo_size;
u32 *vmcoreinfo_note;

/*
 * 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;
			}
		}
	}

	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_save_vmcoreinfo(void)
{
	if (!vmcoreinfo_note)
		return;

	vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
	update_vmcoreinfo_note();
}

void vmcoreinfo_append_str(const char *fmt, ...)
{
	va_list args;
	char buf[0x50];
	size_t r;

	va_start(args, fmt);
	r = vscnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);

	r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);

	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);

	vmcoreinfo_size += r;
}

/*
 * provide an empty default implementation here -- architecture
 * code may override this
 */
void __weak arch_crash_save_vmcoreinfo(void)
{}

phys_addr_t __weak paddr_vmcoreinfo_note(void)
{
	return __pa(vmcoreinfo_note);
}

static int __init crash_save_vmcoreinfo_init(void)
{
	vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
	if (!vmcoreinfo_data) {
		pr_warn("Memory allocation for vmcoreinfo_data failed\n");
		return -ENOMEM;
	}

	vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
						GFP_KERNEL | __GFP_ZERO);
	if (!vmcoreinfo_note) {
		free_page((unsigned long)vmcoreinfo_data);
		vmcoreinfo_data = NULL;
		pr_warn("Memory allocation for vmcoreinfo_note failed\n");
		return -ENOMEM;
	}

	VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
	VMCOREINFO_PAGESIZE(PAGE_SIZE);

	VMCOREINFO_SYMBOL(init_uts_ns);
	VMCOREINFO_SYMBOL(node_online_map);
#ifdef CONFIG_MMU
	VMCOREINFO_SYMBOL(swapper_pg_dir);
#endif
	VMCOREINFO_SYMBOL(_stext);
	VMCOREINFO_SYMBOL(vmap_area_list);

#ifndef CONFIG_NEED_MULTIPLE_NODES
	VMCOREINFO_SYMBOL(mem_map);
	VMCOREINFO_SYMBOL(contig_page_data);
#endif
#ifdef CONFIG_SPARSEMEM
	VMCOREINFO_SYMBOL(mem_section);
	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
	VMCOREINFO_STRUCT_SIZE(mem_section);
	VMCOREINFO_OFFSET(mem_section, section_mem_map);
#endif
	VMCOREINFO_STRUCT_SIZE(page);
	VMCOREINFO_STRUCT_SIZE(pglist_data);
	VMCOREINFO_STRUCT_SIZE(zone);
	VMCOREINFO_STRUCT_SIZE(free_area);
	VMCOREINFO_STRUCT_SIZE(list_head);
	VMCOREINFO_SIZE(nodemask_t);
	VMCOREINFO_OFFSET(page, flags);
	VMCOREINFO_OFFSET(page, _refcount);
	VMCOREINFO_OFFSET(page, mapping);
	VMCOREINFO_OFFSET(page, lru);
	VMCOREINFO_OFFSET(page, _mapcount);
	VMCOREINFO_OFFSET(page, private);
	VMCOREINFO_OFFSET(page, compound_dtor);
	VMCOREINFO_OFFSET(page, compound_order);
	VMCOREINFO_OFFSET(page, compound_head);
	VMCOREINFO_OFFSET(pglist_data, node_zones);
	VMCOREINFO_OFFSET(pglist_data, nr_zones);
#ifdef CONFIG_FLAT_NODE_MEM_MAP
	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
#endif
	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
	VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
	VMCOREINFO_OFFSET(pglist_data, node_id);
	VMCOREINFO_OFFSET(zone, free_area);
	VMCOREINFO_OFFSET(zone, vm_stat);
	VMCOREINFO_OFFSET(zone, spanned_pages);
	VMCOREINFO_OFFSET(free_area, free_list);
	VMCOREINFO_OFFSET(list_head, next);
	VMCOREINFO_OFFSET(list_head, prev);
	VMCOREINFO_OFFSET(vmap_area, va_start);
	VMCOREINFO_OFFSET(vmap_area, list);
	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
	log_buf_vmcoreinfo_setup();
	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
	VMCOREINFO_NUMBER(NR_FREE_PAGES);
	VMCOREINFO_NUMBER(PG_lru);
	VMCOREINFO_NUMBER(PG_private);
	VMCOREINFO_NUMBER(PG_swapcache);
	VMCOREINFO_NUMBER(PG_slab);
#ifdef CONFIG_MEMORY_FAILURE
	VMCOREINFO_NUMBER(PG_hwpoison);
#endif
	VMCOREINFO_NUMBER(PG_head_mask);
	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
#ifdef CONFIG_HUGETLB_PAGE
	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
#endif

	arch_crash_save_vmcoreinfo();
	update_vmcoreinfo_note();

	return 0;
}

subsys_initcall(crash_save_vmcoreinfo_init);
Commit	Line	Data
692f66f2 HB	1	/*
	2	* crash.c - kernel crash support code.
	3	* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
	4	*
	5	* This source code is licensed under the GNU General Public License,
	6	* Version 2. See the file COPYING for more details.
	7	*/
	8
	9	#include <linux/crash_core.h>
	10	#include <linux/utsname.h>
	11	#include <linux/vmalloc.h>
	12
	13	#include <asm/page.h>
	14	#include <asm/sections.h>
	15
	16	/* vmcoreinfo stuff */
203e9e41	17	static unsigned char *vmcoreinfo_data;
692f66f2	18	size_t vmcoreinfo_size;
203e9e41	19	u32 *vmcoreinfo_note;
692f66f2 HB	20
	21	/*
	22	* parsing the "crashkernel" commandline
	23	*
	24	* this code is intended to be called from architecture specific code
	25	*/
	26
	27
	28	/*
	29	* This function parses command lines in the format
	30	*
	31	* crashkernel=ramsize-range:size[,...][@offset]
	32	*
	33	* The function returns 0 on success and -EINVAL on failure.
	34	*/
	35	static int __init parse_crashkernel_mem(char *cmdline,
	36	unsigned long long system_ram,
	37	unsigned long long *crash_size,
	38	unsigned long long *crash_base)
	39	{
	40	char cur = cmdline, tmp;
	41
	42	/* for each entry of the comma-separated list */
	43	do {
	44	unsigned long long start, end = ULLONG_MAX, size;
	45
	46	/* get the start of the range */
	47	start = memparse(cur, &tmp);
	48	if (cur == tmp) {
	49	pr_warn("crashkernel: Memory value expected\n");
	50	return -EINVAL;
	51	}
	52	cur = tmp;
	53	if (*cur != '-') {
	54	pr_warn("crashkernel: '-' expected\n");
	55	return -EINVAL;
	56	}
	57	cur++;
	58
	59	/* if no ':' is here, than we read the end */
	60	if (*cur != ':') {
	61	end = memparse(cur, &tmp);
	62	if (cur == tmp) {
	63	pr_warn("crashkernel: Memory value expected\n");
	64	return -EINVAL;
	65	}
	66	cur = tmp;
	67	if (end <= start) {
	68	pr_warn("crashkernel: end <= start\n");
	69	return -EINVAL;
	70	}
	71	}
	72
	73	if (*cur != ':') {
	74	pr_warn("crashkernel: ':' expected\n");
	75	return -EINVAL;
	76	}
	77	cur++;
	78
	79	size = memparse(cur, &tmp);
	80	if (cur == tmp) {
	81	pr_warn("Memory value expected\n");
	82	return -EINVAL;
	83	}
84	cur = tmp;
85	if (size >= system_ram) {
86	pr_warn("crashkernel: invalid size\n");
87	return -EINVAL;
88	}
89
90	/* match ? */
91	if (system_ram >= start && system_ram < end) {
92	*crash_size = size;
93	break;
94	}
95	} while (*cur++ == ',');
96
97	if (*crash_size > 0) {
98	while (cur && cur != ' ' && *cur != '@')
99	cur++;
100	if (*cur == '@') {
101	cur++;
102	*crash_base = memparse(cur, &tmp);
103	if (cur == tmp) {
104	pr_warn("Memory value expected after '@'\n");
105	return -EINVAL;
106	}
107	}
108	}
109
110	return 0;
111	}
112
113	/*
114	* That function parses "simple" (old) crashkernel command lines like
115	*
116	* crashkernel=size[@offset]
117	*
118	* It returns 0 on success and -EINVAL on failure.
119	*/
120	static int __init parse_crashkernel_simple(char *cmdline,
121	unsigned long long *crash_size,
122	unsigned long long *crash_base)
123	{
124	char *cur = cmdline;
125
126	*crash_size = memparse(cmdline, &cur);
127	if (cmdline == cur) {
128	pr_warn("crashkernel: memory value expected\n");
129	return -EINVAL;
130	}
131
132	if (*cur == '@')
133	*crash_base = memparse(cur+1, &cur);
134	else if (cur != ' ' && cur != '\0') {
135	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
136	return -EINVAL;
137	}
138
139	return 0;
140	}
141
142	#define SUFFIX_HIGH 0
143	#define SUFFIX_LOW 1
144	#define SUFFIX_NULL 2
145	static __initdata char *suffix_tbl[] = {
146	[SUFFIX_HIGH] = ",high",
147	[SUFFIX_LOW] = ",low",
148	[SUFFIX_NULL] = NULL,
149	};
150
151	/*
152	* That function parses "suffix" crashkernel command lines like
153	*
154	* crashkernel=size,[high\|low]
155	*
156	* It returns 0 on success and -EINVAL on failure.
157	*/
158	static int __init parse_crashkernel_suffix(char *cmdline,
159	unsigned long long *crash_size,
160	const char *suffix)
161	{
162	char *cur = cmdline;
163
164	*crash_size = memparse(cmdline, &cur);
165	if (cmdline == cur) {
166	pr_warn("crashkernel: memory value expected\n");
167	return -EINVAL;
168	}
169
170	/* check with suffix */
171	if (strncmp(cur, suffix, strlen(suffix))) {
172	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
173	return -EINVAL;
174	}
175	cur += strlen(suffix);
176	if (cur != ' ' && cur != '\0') {
177	pr_warn("crashkernel: unrecognized char: %c\n", *cur);
178	return -EINVAL;
179	}
180
181	return 0;
182	}
183
184	static __init char get_last_crashkernel(char cmdline,
185	const char *name,
186	const char *suffix)
187	{
188	char p = cmdline, ck_cmdline = NULL;
189
190	/* find crashkernel and use the last one if there are more */
191	p = strstr(p, name);
192	while (p) {
193	char *end_p = strchr(p, ' ');
194	char *q;
195
196	if (!end_p)
197	end_p = p + strlen(p);
198
199	if (!suffix) {
200	int i;
201
202	/* skip the one with any known suffix */
203	for (i = 0; suffix_tbl[i]; i++) {
204	q = end_p - strlen(suffix_tbl[i]);
205	if (!strncmp(q, suffix_tbl[i],
206	strlen(suffix_tbl[i])))
207	goto next;
208	}
209	ck_cmdline = p;
210	} else {
211	q = end_p - strlen(suffix);
212	if (!strncmp(q, suffix, strlen(suffix)))
213	ck_cmdline = p;
214	}
215	next:
216	p = strstr(p+1, name);
217	}
218
219	if (!ck_cmdline)
220	return NULL;
221
222	return ck_cmdline;
223	}
224
225	static int __init __parse_crashkernel(char *cmdline,
226	unsigned long long system_ram,
227	unsigned long long *crash_size,
228	unsigned long long *crash_base,
229	const char *name,
230	const char *suffix)
231	{
232	char first_colon, first_space;
233	char *ck_cmdline;
234
235	BUG_ON(!crash_size \|\| !crash_base);
236	*crash_size = 0;
237	*crash_base = 0;
238
239	ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
240
241	if (!ck_cmdline)
242	return -EINVAL;
243
244	ck_cmdline += strlen(name);
245
246	if (suffix)
247	return parse_crashkernel_suffix(ck_cmdline, crash_size,
248	suffix);
249	/*
250	* if the commandline contains a ':', then that's the extended
251	* syntax -- if not, it must be the classic syntax
252	*/
253	first_colon = strchr(ck_cmdline, ':');
254	first_space = strchr(ck_cmdline, ' ');
255	if (first_colon && (!first_space \|\| first_colon < first_space))
256	return parse_crashkernel_mem(ck_cmdline, system_ram,
257	crash_size, crash_base);
258
259	return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
260	}
261
262	/*
263	* That function is the entry point for command line parsing and should be
264	* called from the arch-specific code.
265	*/
266	int __init parse_crashkernel(char *cmdline,
267	unsigned long long system_ram,
268	unsigned long long *crash_size,
269	unsigned long long *crash_base)
270	{
271	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
272	"crashkernel=", NULL);
273	}
274
275	int __init parse_crashkernel_high(char *cmdline,
276	unsigned long long system_ram,
277	unsigned long long *crash_size,
278	unsigned long long *crash_base)
279	{
280	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
281	"crashkernel=", suffix_tbl[SUFFIX_HIGH]);
282	}
283
284	int __init parse_crashkernel_low(char *cmdline,
285	unsigned long long system_ram,
286	unsigned long long *crash_size,
287	unsigned long long *crash_base)
288	{
289	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
290	"crashkernel=", suffix_tbl[SUFFIX_LOW]);
291	}
292
51dbd925 HB	293	Elf_Word append_elf_note(Elf_Word buf, char *name, unsigned int type,
51dbd925 HB	294	void *data, size_t data_len)
692f66f2	295	{
51dbd925 HB	296	struct elf_note note = (struct elf_note )buf;
	297
	298	note->n_namesz = strlen(name) + 1;
	299	note->n_descsz = data_len;
	300	note->n_type = type;
	301	buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
	302	memcpy(buf, name, note->n_namesz);
	303	buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
	304	memcpy(buf, data, data_len);
	305	buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
692f66f2 HB	306
	307	return buf;
	308	}
	309
51dbd925	310	void final_note(Elf_Word *buf)
692f66f2	311	{
51dbd925	312	memset(buf, 0, sizeof(struct elf_note));
692f66f2 HB	313	}
	314
	315	static void update_vmcoreinfo_note(void)
	316	{
	317	u32 *buf = vmcoreinfo_note;
	318
	319	if (!vmcoreinfo_size)
	320	return;
	321	buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
	322	vmcoreinfo_size);
	323	final_note(buf);
	324	}
	325
	326	void crash_save_vmcoreinfo(void)
	327	{
203e9e41 XP	328	if (!vmcoreinfo_note)
	329	return;
	330
692f66f2 HB	331	vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
	332	update_vmcoreinfo_note();
	333	}
	334
	335	void vmcoreinfo_append_str(const char *fmt, ...)
	336	{
	337	va_list args;
	338	char buf[0x50];
	339	size_t r;
	340
	341	va_start(args, fmt);
	342	r = vscnprintf(buf, sizeof(buf), fmt, args);
	343	va_end(args);
	344
5203f499	345	r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
692f66f2 HB	346
	347	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
	348
	349	vmcoreinfo_size += r;
	350	}
	351
	352	/*
	353	* provide an empty default implementation here -- architecture
	354	* code may override this
	355	*/
	356	void __weak arch_crash_save_vmcoreinfo(void)
	357	{}
	358
	359	phys_addr_t __weak paddr_vmcoreinfo_note(void)
	360	{
203e9e41	361	return __pa(vmcoreinfo_note);
692f66f2 HB	362	}
	363
	364	static int __init crash_save_vmcoreinfo_init(void)
	365	{
203e9e41 XP	366	vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
	367	if (!vmcoreinfo_data) {
	368	pr_warn("Memory allocation for vmcoreinfo_data failed\n");
	369	return -ENOMEM;
	370	}
	371
	372	vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
	373	GFP_KERNEL \| __GFP_ZERO);
	374	if (!vmcoreinfo_note) {
	375	free_page((unsigned long)vmcoreinfo_data);
	376	vmcoreinfo_data = NULL;
	377	pr_warn("Memory allocation for vmcoreinfo_note failed\n");
	378	return -ENOMEM;
	379	}
	380
692f66f2 HB	381	VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
	382	VMCOREINFO_PAGESIZE(PAGE_SIZE);
	383
	384	VMCOREINFO_SYMBOL(init_uts_ns);
	385	VMCOREINFO_SYMBOL(node_online_map);
	386	#ifdef CONFIG_MMU
	387	VMCOREINFO_SYMBOL(swapper_pg_dir);
	388	#endif
	389	VMCOREINFO_SYMBOL(_stext);
	390	VMCOREINFO_SYMBOL(vmap_area_list);
	391
	392	#ifndef CONFIG_NEED_MULTIPLE_NODES
	393	VMCOREINFO_SYMBOL(mem_map);
	394	VMCOREINFO_SYMBOL(contig_page_data);
	395	#endif
	396	#ifdef CONFIG_SPARSEMEM
	397	VMCOREINFO_SYMBOL(mem_section);
	398	VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
	399	VMCOREINFO_STRUCT_SIZE(mem_section);
	400	VMCOREINFO_OFFSET(mem_section, section_mem_map);
	401	#endif
	402	VMCOREINFO_STRUCT_SIZE(page);
	403	VMCOREINFO_STRUCT_SIZE(pglist_data);
	404	VMCOREINFO_STRUCT_SIZE(zone);
	405	VMCOREINFO_STRUCT_SIZE(free_area);
	406	VMCOREINFO_STRUCT_SIZE(list_head);
	407	VMCOREINFO_SIZE(nodemask_t);
	408	VMCOREINFO_OFFSET(page, flags);
	409	VMCOREINFO_OFFSET(page, _refcount);
	410	VMCOREINFO_OFFSET(page, mapping);
	411	VMCOREINFO_OFFSET(page, lru);
	412	VMCOREINFO_OFFSET(page, _mapcount);
	413	VMCOREINFO_OFFSET(page, private);
	414	VMCOREINFO_OFFSET(page, compound_dtor);
	415	VMCOREINFO_OFFSET(page, compound_order);
	416	VMCOREINFO_OFFSET(page, compound_head);
	417	VMCOREINFO_OFFSET(pglist_data, node_zones);
	418	VMCOREINFO_OFFSET(pglist_data, nr_zones);
	419	#ifdef CONFIG_FLAT_NODE_MEM_MAP
	420	VMCOREINFO_OFFSET(pglist_data, node_mem_map);
	421	#endif
	422	VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
	423	VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
	424	VMCOREINFO_OFFSET(pglist_data, node_id);
	425	VMCOREINFO_OFFSET(zone, free_area);
	426	VMCOREINFO_OFFSET(zone, vm_stat);
	427	VMCOREINFO_OFFSET(zone, spanned_pages);
	428	VMCOREINFO_OFFSET(free_area, free_list);
	429	VMCOREINFO_OFFSET(list_head, next);
	430	VMCOREINFO_OFFSET(list_head, prev);
	431	VMCOREINFO_OFFSET(vmap_area, va_start);
	432	VMCOREINFO_OFFSET(vmap_area, list);
	433	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
	434	log_buf_vmcoreinfo_setup();
	435	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
	436	VMCOREINFO_NUMBER(NR_FREE_PAGES);
	437	VMCOREINFO_NUMBER(PG_lru);
	438	VMCOREINFO_NUMBER(PG_private);
	439	VMCOREINFO_NUMBER(PG_swapcache);
	440	VMCOREINFO_NUMBER(PG_slab);
	441	#ifdef CONFIG_MEMORY_FAILURE
	442	VMCOREINFO_NUMBER(PG_hwpoison);
	443	#endif
	444	VMCOREINFO_NUMBER(PG_head_mask);
445	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
446	#ifdef CONFIG_HUGETLB_PAGE
447	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
448	#endif
449
450	arch_crash_save_vmcoreinfo();
451	update_vmcoreinfo_note();
452
453	return 0;
454	}
455
456	subsys_initcall(crash_save_vmcoreinfo_init);