2 +++ b/include/linux/crashlog.h
7 +#ifdef CONFIG_CRASHLOG
8 +void crashlog_init_bootmem(struct bootmem_data *bdata);
9 +void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size);
11 +static inline void crashlog_init_bootmem(struct bootmem_data *bdata)
15 +static inline void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
23 @@ -1145,6 +1145,10 @@ config RELAY
28 + bool "Crash logging"
29 + depends on (!NO_BOOTMEM || HAVE_MEMBLOCK) && !(ARM || SPARC || PPC)
32 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
33 depends on BROKEN || !FRV
36 @@ -109,6 +109,7 @@ obj-$(CONFIG_PADATA) += padata.o
37 obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
38 obj-$(CONFIG_JUMP_LABEL) += jump_label.o
39 obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
40 +obj-$(CONFIG_CRASHLOG) += crashlog.o
42 $(obj)/configs.o: $(obj)/config_data.h
45 +++ b/kernel/crashlog.c
48 + * Crash information logger
49 + * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
51 + * Based on ramoops.c
52 + * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
54 + * This program is free software; you can redistribute it and/or
55 + * modify it under the terms of the GNU General Public License
56 + * version 2 as published by the Free Software Foundation.
58 + * This program is distributed in the hope that it will be useful, but
59 + * WITHOUT ANY WARRANTY; without even the implied warranty of
60 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
61 + * General Public License for more details.
63 + * You should have received a copy of the GNU General Public License
64 + * along with this program; if not, write to the Free Software
65 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
70 +#include <linux/module.h>
71 +#include <linux/bootmem.h>
72 +#include <linux/memblock.h>
73 +#include <linux/debugfs.h>
74 +#include <linux/crashlog.h>
75 +#include <linux/kmsg_dump.h>
76 +#include <linux/module.h>
77 +#include <linux/pfn.h>
80 +#define CRASHLOG_PAGES 4
81 +#define CRASHLOG_SIZE (CRASHLOG_PAGES * PAGE_SIZE)
82 +#define CRASHLOG_MAGIC 0xa1eedead
85 + * Start the log at 1M before the end of RAM, as some boot loaders like
86 + * to use the end of the RAM for stack usage and other things
87 + * If this fails, fall back to using the last part.
89 +#define CRASHLOG_OFFSET (1024 * 1024)
91 +struct crashlog_data {
97 +static struct debugfs_blob_wrapper crashlog_blob;
98 +static unsigned long crashlog_addr = 0;
99 +static struct crashlog_data *crashlog_buf;
100 +static struct kmsg_dumper dump;
101 +static bool first = true;
103 +extern struct list_head *crashlog_modules;
105 +#ifndef CONFIG_NO_BOOTMEM
106 +void __init crashlog_init_bootmem(bootmem_data_t *bdata)
108 + unsigned long addr;
113 + addr = PFN_PHYS(bdata->node_low_pfn) - CRASHLOG_OFFSET;
114 + if (reserve_bootmem(addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
115 + printk("Crashlog failed to allocate RAM at address 0x%lx\n", addr);
116 + bdata->node_low_pfn -= CRASHLOG_PAGES;
117 + addr = PFN_PHYS(bdata->node_low_pfn);
119 + crashlog_addr = addr;
123 +#ifdef CONFIG_HAVE_MEMBLOCK
124 +void __meminit crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
129 + addr += size - CRASHLOG_OFFSET;
130 + if (memblock_reserve(addr, CRASHLOG_SIZE)) {
131 + printk("Crashlog failed to allocate RAM at address 0x%lx\n", (unsigned long) addr);
135 + crashlog_addr = addr;
139 +static void __init crashlog_copy(void)
141 + if (crashlog_buf->magic != CRASHLOG_MAGIC)
144 + if (!crashlog_buf->len || crashlog_buf->len >
145 + CRASHLOG_SIZE - sizeof(*crashlog_buf))
148 + crashlog_blob.size = crashlog_buf->len;
149 + crashlog_blob.data = kmemdup(crashlog_buf->data,
150 + crashlog_buf->len, GFP_KERNEL);
152 + debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
155 +static int get_maxlen(void)
157 + return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
160 +static void crashlog_printf(const char *fmt, ...)
163 + int len = get_maxlen();
168 + va_start(args, fmt);
169 + crashlog_buf->len += vsnprintf(
170 + &crashlog_buf->data[crashlog_buf->len],
175 +static void crashlog_do_dump(struct kmsg_dumper *dumper,
176 + enum kmsg_dump_reason reason)
184 + crashlog_printf("\n===================================\n");
186 + do_gettimeofday(&tv);
187 + crashlog_printf("Time: %lu.%lu\n",
188 + (long)tv.tv_sec, (long)tv.tv_usec);
191 + crashlog_printf("Modules:");
192 + list_for_each_entry(m, crashlog_modules, list) {
193 + crashlog_printf("\t%s@%p+%x", m->name,
194 + m->module_core, m->core_size,
195 + m->module_init, m->init_size);
197 + crashlog_printf("\n");
201 + buf = (char *)&crashlog_buf->data[crashlog_buf->len];
203 + kmsg_dump_get_buffer(dumper, true, buf, get_maxlen(), &len);
205 + crashlog_buf->len += len;
209 +int __init crashlog_init_fs(void)
211 + if (!crashlog_addr)
214 + crashlog_buf = ioremap(crashlog_addr, CRASHLOG_SIZE);
218 + crashlog_buf->magic = CRASHLOG_MAGIC;
219 + crashlog_buf->len = 0;
221 + dump.max_reason = KMSG_DUMP_OOPS;
222 + dump.dump = crashlog_do_dump;
223 + kmsg_dump_register(&dump);
227 +module_init(crashlog_init_fs);
231 #include <linux/export.h>
232 #include <linux/kmemleak.h>
233 #include <linux/range.h>
234 +#include <linux/crashlog.h>
235 #include <linux/memblock.h>
238 @@ -177,6 +178,7 @@ static unsigned long __init free_all_boo
239 if (!bdata->node_bootmem_map)
242 + crashlog_init_bootmem(bdata);
243 start = bdata->node_min_pfn;
244 end = bdata->node_low_pfn;
246 --- a/kernel/module.c
247 +++ b/kernel/module.c
248 @@ -106,6 +106,9 @@ static LIST_HEAD(modules);
249 #ifdef CONFIG_KGDB_KDB
250 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
251 #endif /* CONFIG_KGDB_KDB */
252 +#ifdef CONFIG_CRASHLOG
253 +struct list_head *crashlog_modules = &modules;
256 #ifdef CONFIG_MODULE_SIG
257 #ifdef CONFIG_MODULE_SIG_FORCE
261 #include <linux/debugfs.h>
262 #include <linux/seq_file.h>
263 #include <linux/memblock.h>
264 +#include <linux/crashlog.h>
266 static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
267 static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
268 @@ -343,6 +344,8 @@ static void __init_memblock memblock_ins
269 memblock_set_region_node(rgn, nid);
271 type->total_size += size;
272 + if (type == &memblock.memory && idx == 0)
273 + crashlog_init_memblock(base, size);