target/linux/generic/patches-3.9/930-crashlog.patch

   1 --- /dev/null
   2 +++ b/include/linux/crashlog.h
   3 @@ -0,0 +1,17 @@
   4 +#ifndef __CRASHLOG_H
   5 +#define __CRASHLOG_H
   6 +
   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);
  10 +#else
  11 +static inline void crashlog_init_bootmem(struct bootmem_data *bdata)
  12 +{
  13 +}
  14 +
  15 +static inline void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
  16 +{
  17 +}
  18 +#endif
  19 +
  20 +#endif
  21 --- a/init/Kconfig
  22 +++ b/init/Kconfig
  23 @@ -1141,6 +1141,10 @@ config RELAY
  24
  25           If unsure, say N.
  26
  27 +config CRASHLOG
  28 +       bool "Crash logging"
  29 +       depends on (!NO_BOOTMEM || HAVE_MEMBLOCK) && !(ARM || SPARC || PPC)
  30 +
  31  config BLK_DEV_INITRD
  32         bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
  33         depends on BROKEN || !FRV
  34 --- a/kernel/Makefile
  35 +++ b/kernel/Makefile
  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
  41
  42  $(obj)/configs.o: $(obj)/config_data.h
  43
  44 --- /dev/null
  45 +++ b/kernel/crashlog.c
  46 @@ -0,0 +1,181 @@
  47 +/*
  48 + * Crash information logger
  49 + * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
  50 + *
  51 + * Based on ramoops.c
  52 + *   Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
  53 + *
  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.
  57 + *
  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.
  62 + *
  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
  66 + * 02110-1301 USA
  67 + *
  68 + */
  69 +
  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>
  78 +#include <asm/io.h>
  79 +
  80 +#define CRASHLOG_PAGES 4
  81 +#define CRASHLOG_SIZE  (CRASHLOG_PAGES * PAGE_SIZE)
  82 +#define CRASHLOG_MAGIC 0xa1eedead
  83 +
  84 +/*
  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.
  88 + */
  89 +#define CRASHLOG_OFFSET        (1024 * 1024)
  90 +
  91 +struct crashlog_data {
  92 +       u32 magic;
  93 +       u32 len;
  94 +       u8 data[];
  95 +};
  96 +
  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;
 102 +
 103 +extern struct list_head *crashlog_modules;
 104 +
 105 +#ifndef CONFIG_NO_BOOTMEM
 106 +void __init crashlog_init_bootmem(bootmem_data_t *bdata)
 107 +{
 108 +       unsigned long addr;
 109 +
 110 +       if (crashlog_addr)
 111 +               return;
 112 +
 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);
 118 +       }
 119 +       crashlog_addr = addr;
 120 +}
 121 +#endif
 122 +
 123 +#ifdef CONFIG_HAVE_MEMBLOCK
 124 +void __meminit crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
 125 +{
 126 +       if (crashlog_addr)
 127 +               return;
 128 +
 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);
 132 +               return;
 133 +       }
 134 +
 135 +       crashlog_addr = addr;
 136 +}
 137 +#endif
 138 +
 139 +static void __init crashlog_copy(void)
 140 +{
 141 +       if (crashlog_buf->magic != CRASHLOG_MAGIC)
 142 +               return;
 143 +
 144 +       if (!crashlog_buf->len || crashlog_buf->len >
 145 +           CRASHLOG_SIZE - sizeof(*crashlog_buf))
 146 +               return;
 147 +
 148 +       crashlog_blob.size = crashlog_buf->len;
 149 +       crashlog_blob.data = kmemdup(crashlog_buf->data,
 150 +               crashlog_buf->len, GFP_KERNEL);
 151 +
 152 +       debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
 153 +}
 154 +
 155 +static int get_maxlen(void)
 156 +{
 157 +       return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
 158 +}
 159 +
 160 +static void crashlog_printf(const char *fmt, ...)
 161 +{
 162 +       va_list args;
 163 +       int len = get_maxlen();
 164 +
 165 +       if (!len)
 166 +               return;
 167 +
 168 +       va_start(args, fmt);
 169 +       crashlog_buf->len += vscnprintf(
 170 +               &crashlog_buf->data[crashlog_buf->len],
 171 +               len, fmt, args);
 172 +       va_end(args);
 173 +}
 174 +
 175 +static void crashlog_do_dump(struct kmsg_dumper *dumper,
 176 +               enum kmsg_dump_reason reason)
 177 +{
 178 +       struct timeval tv;
 179 +       struct module *m;
 180 +       char *buf;
 181 +       size_t len;
 182 +
 183 +       if (!first)
 184 +               crashlog_printf("\n===================================\n");
 185 +
 186 +       do_gettimeofday(&tv);
 187 +       crashlog_printf("Time: %lu.%lu\n",
 188 +               (long)tv.tv_sec, (long)tv.tv_usec);
 189 +
 190 +       if (first) {
 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);
 196 +               }
 197 +               crashlog_printf("\n");
 198 +               first = false;
 199 +       }
 200 +
 201 +       buf = (char *)&crashlog_buf->data[crashlog_buf->len];
 202 +
 203 +       kmsg_dump_get_buffer(dumper, true, buf, get_maxlen(), &len);
 204 +
 205 +       crashlog_buf->len += len;
 206 +}
 207 +
 208 +
 209 +int __init crashlog_init_fs(void)
 210 +{
 211 +       if (!crashlog_addr)
 212 +               return -ENOMEM;
 213 +
 214 +       crashlog_buf = ioremap(crashlog_addr, CRASHLOG_SIZE);
 215 +
 216 +       crashlog_copy();
 217 +
 218 +       crashlog_buf->magic = CRASHLOG_MAGIC;
 219 +       crashlog_buf->len = 0;
 220 +
 221 +       dump.max_reason = KMSG_DUMP_OOPS;
 222 +       dump.dump = crashlog_do_dump;
 223 +       kmsg_dump_register(&dump);
 224 +
 225 +       return 0;
 226 +}
 227 +module_init(crashlog_init_fs);
 228 --- a/mm/bootmem.c
 229 +++ b/mm/bootmem.c
 230 @@ -15,6 +15,7 @@
 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>
 236
 237  #include <asm/bug.h>
 238 @@ -177,6 +178,7 @@ static unsigned long __init free_all_boo
 239         if (!bdata->node_bootmem_map)
 240                 return 0;
 241
 242 +       crashlog_init_bootmem(bdata);
 243         start = bdata->node_min_pfn;
 244         end = bdata->node_low_pfn;
 245
 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;
 254 +#endif
 255
 256  #ifdef CONFIG_MODULE_SIG
 257  #ifdef CONFIG_MODULE_SIG_FORCE
 258 --- a/mm/memblock.c
 259 +++ b/mm/memblock.c
 260 @@ -19,6 +19,7 @@
 261  #include <linux/debugfs.h>
 262  #include <linux/seq_file.h>
 263  #include <linux/memblock.h>
 264 +#include <linux/crashlog.h>
 265
 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);
 270         type->cnt++;
 271         type->total_size += size;
 272 +       if (type == &memblock.memory && idx == 0)
 273 +               crashlog_init_memblock(base, size);
 274  }
 275
 276  /**