target/linux/generic/patches-4.4/930-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 @@ -1296,6 +1296,10 @@ config RELAY
  24
  25           If unsure, say N.
  26
  27 +config CRASHLOG
  28 +       bool "Crash logging"
  29 +       depends on (!NO_BOOTMEM || HAVE_MEMBLOCK)
  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 @@ -103,6 +103,7 @@ obj-$(CONFIG_TORTURE_TEST) += torture.o
  37  obj-$(CONFIG_MEMBARRIER) += membarrier.o
  38
  39  obj-$(CONFIG_HAS_IOMEM) += memremap.o
  40 +obj-$(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 +1,193 @@
  47 +/*
  48 + * Crash information logger
  49 + * Copyright (C) 2010 Felix Fietkau <nbd@nbd.name>
  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 <linux/vmalloc.h>
  79 +#include <asm/io.h>
  80 +
  81 +#define CRASHLOG_PAGES 4
  82 +#define CRASHLOG_SIZE  (CRASHLOG_PAGES * PAGE_SIZE)
  83 +#define CRASHLOG_MAGIC 0xa1eedead
  84 +
  85 +/*
  86 + * Start the log at 1M before the end of RAM, as some boot loaders like
  87 + * to use the end of the RAM for stack usage and other things
  88 + * If this fails, fall back to using the last part.
  89 + */
  90 +#define CRASHLOG_OFFSET        (1024 * 1024)
  91 +
  92 +struct crashlog_data {
  93 +       u32 magic;
  94 +       u32 len;
  95 +       u8 data[];
  96 +};
  97 +
  98 +static struct debugfs_blob_wrapper crashlog_blob;
  99 +static unsigned long crashlog_addr = 0;
 100 +static struct crashlog_data *crashlog_buf;
 101 +static struct kmsg_dumper dump;
 102 +static bool first = true;
 103 +
 104 +extern struct list_head *crashlog_modules;
 105 +
 106 +#ifndef CONFIG_NO_BOOTMEM
 107 +void __init crashlog_init_bootmem(bootmem_data_t *bdata)
 108 +{
 109 +       unsigned long addr;
 110 +
 111 +       if (crashlog_addr)
 112 +               return;
 113 +
 114 +       addr = PFN_PHYS(bdata->node_low_pfn) - CRASHLOG_OFFSET;
 115 +       if (reserve_bootmem(addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
 116 +               printk("Crashlog failed to allocate RAM at address 0x%lx\n", addr);
 117 +               bdata->node_low_pfn -= CRASHLOG_PAGES;
 118 +               addr = PFN_PHYS(bdata->node_low_pfn);
 119 +       }
 120 +       crashlog_addr = addr;
 121 +}
 122 +#endif
 123 +
 124 +#ifdef CONFIG_HAVE_MEMBLOCK
 125 +void __init_memblock crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
 126 +{
 127 +       if (crashlog_addr)
 128 +               return;
 129 +
 130 +       addr += size - CRASHLOG_OFFSET;
 131 +       if (memblock_reserve(addr, CRASHLOG_SIZE)) {
 132 +               printk("Crashlog failed to allocate RAM at address 0x%lx\n", (unsigned long) addr);
 133 +               return;
 134 +       }
 135 +
 136 +       crashlog_addr = addr;
 137 +}
 138 +#endif
 139 +
 140 +static void __init crashlog_copy(void)
 141 +{
 142 +       if (crashlog_buf->magic != CRASHLOG_MAGIC)
 143 +               return;
 144 +
 145 +       if (!crashlog_buf->len || crashlog_buf->len >
 146 +           CRASHLOG_SIZE - sizeof(*crashlog_buf))
 147 +               return;
 148 +
 149 +       crashlog_blob.size = crashlog_buf->len;
 150 +       crashlog_blob.data = kmemdup(crashlog_buf->data,
 151 +               crashlog_buf->len, GFP_KERNEL);
 152 +
 153 +       debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
 154 +}
 155 +
 156 +static int get_maxlen(void)
 157 +{
 158 +       return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
 159 +}
 160 +
 161 +static void crashlog_printf(const char *fmt, ...)
 162 +{
 163 +       va_list args;
 164 +       int len = get_maxlen();
 165 +
 166 +       if (!len)
 167 +               return;
 168 +
 169 +       va_start(args, fmt);
 170 +       crashlog_buf->len += vscnprintf(
 171 +               &crashlog_buf->data[crashlog_buf->len],
 172 +               len, fmt, args);
 173 +       va_end(args);
 174 +}
 175 +
 176 +static void crashlog_do_dump(struct kmsg_dumper *dumper,
 177 +               enum kmsg_dump_reason reason)
 178 +{
 179 +       struct timeval tv;
 180 +       struct module *m;
 181 +       char *buf;
 182 +       size_t len;
 183 +
 184 +       if (!first)
 185 +               crashlog_printf("\n===================================\n");
 186 +
 187 +       do_gettimeofday(&tv);
 188 +       crashlog_printf("Time: %lu.%lu\n",
 189 +               (long)tv.tv_sec, (long)tv.tv_usec);
 190 +
 191 +       if (first) {
 192 +               crashlog_printf("Modules:");
 193 +               list_for_each_entry(m, crashlog_modules, list) {
 194 +                       crashlog_printf("\t%s@%p+%x", m->name,
 195 +                       m->module_core, m->core_size,
 196 +                       m->module_init, m->init_size);
 197 +               }
 198 +               crashlog_printf("\n");
 199 +               first = false;
 200 +       }
 201 +
 202 +       buf = (char *)&crashlog_buf->data[crashlog_buf->len];
 203 +
 204 +       kmsg_dump_get_buffer(dumper, true, buf, get_maxlen(), &len);
 205 +
 206 +       crashlog_buf->len += len;
 207 +}
 208 +
 209 +
 210 +int __init crashlog_init_fs(void)
 211 +{
 212 +       struct page *pages[CRASHLOG_PAGES];
 213 +       pgprot_t prot;
 214 +       int i;
 215 +
 216 +       if (!crashlog_addr) {
 217 +               printk("No memory allocated for crashlog\n");
 218 +               return -ENOMEM;
 219 +       }
 220 +
 221 +       printk("Crashlog allocated RAM at address 0x%lx\n", (unsigned long) crashlog_addr);
 222 +       for (i = 0; i < CRASHLOG_PAGES; i++)
 223 +               pages[i] = pfn_to_page((crashlog_addr >> PAGE_SHIFT) + i);
 224 +
 225 +       prot = pgprot_writecombine(PAGE_KERNEL);
 226 +       crashlog_buf = vmap(pages, CRASHLOG_PAGES, VM_MAP, prot);
 227 +
 228 +       crashlog_copy();
 229 +
 230 +       crashlog_buf->magic = CRASHLOG_MAGIC;
 231 +       crashlog_buf->len = 0;
 232 +
 233 +       dump.max_reason = KMSG_DUMP_OOPS;
 234 +       dump.dump = crashlog_do_dump;
 235 +       kmsg_dump_register(&dump);
 236 +
 237 +       return 0;
 238 +}
 239 +module_init(crashlog_init_fs);
 240 --- a/mm/bootmem.c
 241 +++ b/mm/bootmem.c
 242 @@ -15,6 +15,7 @@
 243  #include <linux/export.h>
 244  #include <linux/kmemleak.h>
 245  #include <linux/range.h>
 246 +#include <linux/crashlog.h>
 247  #include <linux/memblock.h>
 248  #include <linux/bug.h>
 249  #include <linux/io.h>
 250 @@ -177,6 +178,7 @@ static unsigned long __init free_all_boo
 251         if (!bdata->node_bootmem_map)
 252                 return 0;
 253
 254 +       crashlog_init_bootmem(bdata);
 255         map = bdata->node_bootmem_map;
 256         start = bdata->node_min_pfn;
 257         end = bdata->node_low_pfn;
 258 --- a/kernel/module.c
 259 +++ b/kernel/module.c
 260 @@ -275,6 +275,9 @@ static void mod_update_bounds(struct mod
 261  #ifdef CONFIG_KGDB_KDB
 262  struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
 263  #endif /* CONFIG_KGDB_KDB */
 264 +#ifdef CONFIG_CRASHLOG
 265 +struct list_head *crashlog_modules = &modules;
 266 +#endif
 267
 268  static void module_assert_mutex(void)
 269  {
 270 --- a/mm/memblock.c
 271 +++ b/mm/memblock.c
 272 @@ -19,6 +19,7 @@
 273  #include <linux/debugfs.h>
 274  #include <linux/seq_file.h>
 275  #include <linux/memblock.h>
 276 +#include <linux/crashlog.h>
 277
 278  #include <asm-generic/sections.h>
 279  #include <linux/io.h>
 280 @@ -541,6 +542,8 @@ int __init_memblock memblock_add_range(s
 281                 type->regions[0].flags = flags;
 282                 memblock_set_region_node(&type->regions[0], nid);
 283                 type->total_size = size;
 284 +               if (type == &memblock.memory)
 285 +                       crashlog_init_memblock(base, size);
 286                 return 0;
 287         }
 288  repeat: