target/linux/generic/patches-3.2/930-crashlog.patch

   1 --- /dev/null
   2 +++ b/include/linux/crashlog.h
   3 @@ -0,0 +1,12 @@
   4 +#ifndef __CRASHLOG_H
   5 +#define __CRASHLOG_H
   6 +
   7 +#ifdef CONFIG_CRASHLOG
   8 +void __init crashlog_init_mem(struct bootmem_data *bdata);
   9 +#else
  10 +static inline void crashlog_init_mem(struct bootmem_data *bdata)
  11 +{
  12 +}
  13 +#endif
  14 +
  15 +#endif
  16 --- a/init/Kconfig
  17 +++ b/init/Kconfig
  18 @@ -891,6 +891,10 @@ config RELAY
  19
  20           If unsure, say N.
  21
  22 +config CRASHLOG
  23 +       bool "Crash logging"
  24 +       depends on !NO_BOOTMEM && !HAVE_MEMBLOCK
  25 +
  26  config BLK_DEV_INITRD
  27         bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
  28         depends on BROKEN || !FRV
  29 --- a/kernel/Makefile
  30 +++ b/kernel/Makefile
  31 @@ -109,6 +109,7 @@ obj-$(CONFIG_USER_RETURN_NOTIFIER) += us
  32  obj-$(CONFIG_PADATA) += padata.o
  33  obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
  34  obj-$(CONFIG_JUMP_LABEL) += jump_label.o
  35 +obj-$(CONFIG_CRASHLOG) += crashlog.o
  36
  37  ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
  38  # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
  39 --- /dev/null
  40 +++ b/kernel/crashlog.c
  41 @@ -0,0 +1,171 @@
  42 +/*
  43 + * Crash information logger
  44 + * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
  45 + *
  46 + * Based on ramoops.c
  47 + *   Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
  48 + *
  49 + * This program is free software; you can redistribute it and/or
  50 + * modify it under the terms of the GNU General Public License
  51 + * version 2 as published by the Free Software Foundation.
  52 + *
  53 + * This program is distributed in the hope that it will be useful, but
  54 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  55 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  56 + * General Public License for more details.
  57 + *
  58 + * You should have received a copy of the GNU General Public License
  59 + * along with this program; if not, write to the Free Software
  60 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  61 + * 02110-1301 USA
  62 + *
  63 + */
  64 +
  65 +#include <linux/module.h>
  66 +#include <linux/bootmem.h>
  67 +#include <linux/debugfs.h>
  68 +#include <linux/crashlog.h>
  69 +#include <linux/kmsg_dump.h>
  70 +#include <linux/module.h>
  71 +#include <linux/pfn.h>
  72 +#include <asm/io.h>
  73 +
  74 +#define CRASHLOG_PAGES 4
  75 +#define CRASHLOG_SIZE  (CRASHLOG_PAGES * PAGE_SIZE)
  76 +#define CRASHLOG_MAGIC 0xa1eedead
  77 +
  78 +/*
  79 + * Start the log at 1M before the end of RAM, as some boot loaders like
  80 + * to use the end of the RAM for stack usage and other things
  81 + * If this fails, fall back to using the last part.
  82 + */
  83 +#define CRASHLOG_OFFSET        (1024 * 1024)
  84 +
  85 +struct crashlog_data {
  86 +       u32 magic;
  87 +       u32 len;
  88 +       u8 data[];
  89 +};
  90 +
  91 +static struct debugfs_blob_wrapper crashlog_blob;
  92 +static unsigned long crashlog_addr = 0;
  93 +static struct crashlog_data *crashlog_buf;
  94 +static struct kmsg_dumper dump;
  95 +static bool first = true;
  96 +
  97 +extern struct list_head *crashlog_modules;
  98 +
  99 +void __init crashlog_init_mem(bootmem_data_t *bdata)
 100 +{
 101 +       unsigned long addr;
 102 +
 103 +       if (crashlog_addr)
 104 +               return;
 105 +
 106 +       addr = PFN_PHYS(bdata->node_low_pfn) - CRASHLOG_OFFSET;
 107 +       if (reserve_bootmem(addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
 108 +               printk("Crashlog failed to allocate RAM at address 0x%lx\n", addr);
 109 +               bdata->node_low_pfn -= CRASHLOG_PAGES;
 110 +               addr = PFN_PHYS(bdata->node_low_pfn);
 111 +       }
 112 +       crashlog_addr = addr;
 113 +}
 114 +
 115 +static void __init crashlog_copy(void)
 116 +{
 117 +       if (crashlog_buf->magic != CRASHLOG_MAGIC)
 118 +               return;
 119 +
 120 +       if (!crashlog_buf->len || crashlog_buf->len >
 121 +           CRASHLOG_SIZE - sizeof(*crashlog_buf))
 122 +               return;
 123 +
 124 +       crashlog_blob.size = crashlog_buf->len;
 125 +       crashlog_blob.data = kmemdup(crashlog_buf->data,
 126 +               crashlog_buf->len, GFP_KERNEL);
 127 +
 128 +       debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
 129 +}
 130 +
 131 +static int get_maxlen(void)
 132 +{
 133 +       return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
 134 +}
 135 +
 136 +static void crashlog_printf(const char *fmt, ...)
 137 +{
 138 +       va_list args;
 139 +       int len = get_maxlen();
 140 +
 141 +       if (!len)
 142 +               return;
 143 +
 144 +       va_start(args, fmt);
 145 +       crashlog_buf->len += vsnprintf(
 146 +               &crashlog_buf->data[crashlog_buf->len],
 147 +               len, fmt, args);
 148 +       va_end(args);
 149 +}
 150 +
 151 +static void crashlog_do_dump(struct kmsg_dumper *dumper,
 152 +               enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
 153 +               const char *s2, unsigned long l2)
 154 +{
 155 +       unsigned long s1_start, s2_start;
 156 +       unsigned long l1_cpy, l2_cpy;
 157 +       struct timeval tv;
 158 +       struct module *m;
 159 +       char *buf;
 160 +       int len;
 161 +
 162 +       if (!first)
 163 +               crashlog_printf("\n===================================\n");
 164 +
 165 +       do_gettimeofday(&tv);
 166 +       crashlog_printf("Time: %lu.%lu\n",
 167 +               (long)tv.tv_sec, (long)tv.tv_usec);
 168 +
 169 +       if (first) {
 170 +               crashlog_printf("Modules:");
 171 +               list_for_each_entry(m, crashlog_modules, list) {
 172 +                       crashlog_printf("\t%s@%p+%x", m->name,
 173 +                       m->module_core, m->core_size,
 174 +                       m->module_init, m->init_size);
 175 +               }
 176 +               crashlog_printf("\n");
 177 +               first = false;
 178 +       }
 179 +
 180 +       buf = (char *)&crashlog_buf->data[crashlog_buf->len];
 181 +       len = get_maxlen();
 182 +
 183 +       l2_cpy = min(l2, (unsigned long)len);
 184 +       l1_cpy = min(l1, (unsigned long)len - l2_cpy);
 185 +
 186 +       s2_start = l2 - l2_cpy;
 187 +       s1_start = l1 - l1_cpy;
 188 +
 189 +       memcpy(buf, s1 + s1_start, l1_cpy);
 190 +       memcpy(buf + l1_cpy, s2 + s2_start, l2_cpy);
 191 +       crashlog_buf->len += l1_cpy + l2_cpy;
 192 +}
 193 +
 194 +
 195 +int __init crashlog_init_fs(void)
 196 +{
 197 +       if (!crashlog_addr)
 198 +               return -ENOMEM;
 199 +
 200 +       crashlog_buf = ioremap(crashlog_addr, CRASHLOG_SIZE);
 201 +
 202 +       crashlog_copy();
 203 +
 204 +       crashlog_buf->magic = CRASHLOG_MAGIC;
 205 +       crashlog_buf->len = 0;
 206 +
 207 +       dump.dump = crashlog_do_dump;
 208 +       kmsg_dump_register(&dump);
 209 +
 210 +       return 0;
 211 +}
 212 +module_init(crashlog_init_fs);
 213 --- a/mm/bootmem.c
 214 +++ b/mm/bootmem.c
 215 @@ -15,6 +15,7 @@
 216  #include <linux/export.h>
 217  #include <linux/kmemleak.h>
 218  #include <linux/range.h>
 219 +#include <linux/crashlog.h>
 220  #include <linux/memblock.h>
 221
 222  #include <asm/bug.h>
 223 @@ -178,6 +179,7 @@ static unsigned long __init free_all_boo
 224         if (!bdata->node_bootmem_map)
 225                 return 0;
 226
 227 +       crashlog_init_mem(bdata);
 228         start = bdata->node_min_pfn;
 229         end = bdata->node_low_pfn;
 230
 231 --- a/kernel/module.c
 232 +++ b/kernel/module.c
 233 @@ -107,6 +107,9 @@ static LIST_HEAD(modules);
 234  #ifdef CONFIG_KGDB_KDB
 235  struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
 236  #endif /* CONFIG_KGDB_KDB */
 237 +#ifdef CONFIG_CRASHLOG
 238 +struct list_head *crashlog_modules = &modules;
 239 +#endif
 240
 241
 242  /* Block module loading/unloading? */