San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 1 | /* drivers/misc/apanic.c |
| 2 | * |
| 3 | * Copyright (C) 2009 Google, Inc. |
| 4 | * Author: San Mehat <san@android.com> |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/device.h> |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <linux/sched.h> |
| 27 | #include <linux/wait.h> |
| 28 | #include <linux/wakelock.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/uaccess.h> |
| 31 | #include <linux/mtd/mtd.h> |
| 32 | #include <linux/notifier.h> |
| 33 | #include <linux/mtd/mtd.h> |
| 34 | #include <linux/debugfs.h> |
| 35 | #include <linux/fs.h> |
| 36 | #include <linux/proc_fs.h> |
| 37 | #include <linux/mutex.h> |
| 38 | #include <linux/workqueue.h> |
| 39 | #include <linux/preempt.h> |
| 40 | |
San Mehat | e3af8d4 | 2009-09-17 14:27:41 -0700 | [diff] [blame] | 41 | extern void ram_console_enable_console(int); |
| 42 | |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 43 | struct panic_header { |
| 44 | u32 magic; |
| 45 | #define PANIC_MAGIC 0xdeadf00d |
| 46 | |
| 47 | u32 version; |
| 48 | #define PHDR_VERSION 0x01 |
| 49 | |
| 50 | u32 console_offset; |
| 51 | u32 console_length; |
| 52 | |
| 53 | u32 threads_offset; |
| 54 | u32 threads_length; |
| 55 | }; |
| 56 | |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 57 | struct apanic_data { |
| 58 | struct mtd_info *mtd; |
| 59 | struct panic_header curr; |
| 60 | void *bounce; |
| 61 | struct proc_dir_entry *apanic_console; |
| 62 | struct proc_dir_entry *apanic_threads; |
| 63 | }; |
| 64 | |
| 65 | static struct apanic_data drv_ctx; |
| 66 | static struct work_struct proc_removal_work; |
| 67 | static DEFINE_MUTEX(drv_mutex); |
| 68 | |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 69 | static unsigned int *apanic_bbt; |
| 70 | static unsigned int apanic_erase_blocks; |
| 71 | static unsigned int apanic_good_blocks; |
| 72 | |
| 73 | static void set_bb(unsigned int block, unsigned int *bbt) |
| 74 | { |
| 75 | unsigned int flag = 1; |
| 76 | |
| 77 | BUG_ON(block >= apanic_erase_blocks); |
| 78 | |
| 79 | flag = flag << (block%32); |
| 80 | apanic_bbt[block/32] |= flag; |
| 81 | apanic_good_blocks--; |
| 82 | } |
| 83 | |
| 84 | static unsigned int get_bb(unsigned int block, unsigned int *bbt) |
| 85 | { |
| 86 | unsigned int flag; |
| 87 | |
| 88 | BUG_ON(block >= apanic_erase_blocks); |
| 89 | |
| 90 | flag = 1 << (block%32); |
| 91 | return apanic_bbt[block/32] & flag; |
| 92 | } |
| 93 | |
| 94 | static void alloc_bbt(struct mtd_info *mtd, unsigned int *bbt) |
| 95 | { |
| 96 | int bbt_size; |
| 97 | apanic_erase_blocks = (mtd->size)>>(mtd->erasesize_shift); |
| 98 | bbt_size = (apanic_erase_blocks+32)/32; |
| 99 | |
| 100 | apanic_bbt = kmalloc(bbt_size*4, GFP_KERNEL); |
| 101 | memset(apanic_bbt, 0, bbt_size*4); |
| 102 | apanic_good_blocks = apanic_erase_blocks; |
| 103 | } |
| 104 | static void scan_bbt(struct mtd_info *mtd, unsigned int *bbt) |
| 105 | { |
| 106 | int i; |
| 107 | |
| 108 | for (i = 0; i < apanic_erase_blocks; i++) { |
| 109 | if (mtd->block_isbad(mtd, i*mtd->erasesize)) |
| 110 | set_bb(i, apanic_bbt); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | #define APANIC_INVALID_OFFSET 0xFFFFFFFF |
| 115 | |
| 116 | static unsigned int phy_offset(struct mtd_info *mtd, unsigned int offset) |
| 117 | { |
| 118 | unsigned int logic_block = offset>>(mtd->erasesize_shift); |
| 119 | unsigned int phy_block; |
| 120 | unsigned good_block = 0; |
| 121 | |
| 122 | for (phy_block = 0; phy_block < apanic_erase_blocks; phy_block++) { |
| 123 | if (!get_bb(phy_block, apanic_bbt)) |
| 124 | good_block++; |
| 125 | if (good_block == (logic_block + 1)) |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | if (good_block != (logic_block + 1)) |
| 130 | return APANIC_INVALID_OFFSET; |
| 131 | |
| 132 | return offset + ((phy_block-logic_block)<<mtd->erasesize_shift); |
| 133 | } |
| 134 | |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 135 | static void apanic_erase_callback(struct erase_info *done) |
| 136 | { |
| 137 | wait_queue_head_t *wait_q = (wait_queue_head_t *) done->priv; |
| 138 | wake_up(wait_q); |
| 139 | } |
| 140 | |
| 141 | static int apanic_proc_read(char *buffer, char **start, off_t offset, |
| 142 | int count, int *peof, void *dat) |
| 143 | { |
| 144 | struct apanic_data *ctx = &drv_ctx; |
| 145 | size_t file_length; |
| 146 | off_t file_offset; |
| 147 | unsigned int page_no; |
| 148 | off_t page_offset; |
| 149 | int rc; |
| 150 | size_t len; |
| 151 | |
| 152 | if (!count) |
| 153 | return 0; |
| 154 | |
| 155 | mutex_lock(&drv_mutex); |
| 156 | |
| 157 | switch ((int) dat) { |
| 158 | case 1: /* apanic_console */ |
| 159 | file_length = ctx->curr.console_length; |
| 160 | file_offset = ctx->curr.console_offset; |
| 161 | break; |
| 162 | case 2: /* apanic_threads */ |
| 163 | file_length = ctx->curr.threads_length; |
| 164 | file_offset = ctx->curr.threads_offset; |
| 165 | break; |
| 166 | default: |
| 167 | pr_err("Bad dat (%d)\n", (int) dat); |
| 168 | mutex_unlock(&drv_mutex); |
| 169 | return -EINVAL; |
| 170 | } |
| 171 | |
| 172 | if ((offset + count) > file_length) { |
| 173 | mutex_unlock(&drv_mutex); |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | /* We only support reading a maximum of a flash page */ |
| 178 | if (count > ctx->mtd->writesize) |
| 179 | count = ctx->mtd->writesize; |
| 180 | |
| 181 | page_no = (file_offset + offset) / ctx->mtd->writesize; |
| 182 | page_offset = (file_offset + offset) % ctx->mtd->writesize; |
| 183 | |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 184 | |
| 185 | if (phy_offset(ctx->mtd, (page_no * ctx->mtd->writesize)) |
| 186 | == APANIC_INVALID_OFFSET) { |
| 187 | pr_err("apanic: reading an invalid address\n"); |
| 188 | mutex_unlock(&drv_mutex); |
| 189 | return -EINVAL; |
| 190 | } |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 191 | rc = ctx->mtd->read(ctx->mtd, |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 192 | phy_offset(ctx->mtd, (page_no * ctx->mtd->writesize)), |
| 193 | ctx->mtd->writesize, |
| 194 | &len, ctx->bounce); |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 195 | |
| 196 | if (page_offset) |
| 197 | count -= page_offset; |
| 198 | memcpy(buffer, ctx->bounce + page_offset, count); |
| 199 | |
| 200 | *start = count; |
| 201 | |
| 202 | if ((offset + count) == file_length) |
| 203 | *peof = 1; |
| 204 | |
| 205 | mutex_unlock(&drv_mutex); |
| 206 | return count; |
| 207 | } |
| 208 | |
| 209 | static void mtd_panic_erase(void) |
| 210 | { |
| 211 | struct apanic_data *ctx = &drv_ctx; |
| 212 | struct erase_info erase; |
| 213 | DECLARE_WAITQUEUE(wait, current); |
| 214 | wait_queue_head_t wait_q; |
| 215 | int rc, i; |
| 216 | |
| 217 | init_waitqueue_head(&wait_q); |
| 218 | erase.mtd = ctx->mtd; |
| 219 | erase.callback = apanic_erase_callback; |
| 220 | erase.len = ctx->mtd->erasesize; |
| 221 | erase.priv = (u_long)&wait_q; |
| 222 | for (i = 0; i < ctx->mtd->size; i += ctx->mtd->erasesize) { |
| 223 | erase.addr = i; |
| 224 | set_current_state(TASK_INTERRUPTIBLE); |
| 225 | add_wait_queue(&wait_q, &wait); |
| 226 | |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 227 | if (get_bb(erase.addr>>ctx->mtd->erasesize_shift, apanic_bbt)) { |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 228 | printk(KERN_WARNING |
| 229 | "apanic: Skipping erase of bad " |
| 230 | "block @%llx\n", erase.addr); |
| 231 | set_current_state(TASK_RUNNING); |
| 232 | remove_wait_queue(&wait_q, &wait); |
| 233 | continue; |
| 234 | } |
| 235 | |
| 236 | rc = ctx->mtd->erase(ctx->mtd, &erase); |
| 237 | if (rc) { |
| 238 | set_current_state(TASK_RUNNING); |
| 239 | remove_wait_queue(&wait_q, &wait); |
| 240 | printk(KERN_ERR |
| 241 | "apanic: Erase of 0x%llx, 0x%llx failed\n", |
| 242 | (unsigned long long) erase.addr, |
| 243 | (unsigned long long) erase.len); |
| 244 | if (rc == -EIO) { |
| 245 | if (ctx->mtd->block_markbad(ctx->mtd, |
| 246 | erase.addr)) { |
| 247 | printk(KERN_ERR |
| 248 | "apanic: Err marking blk bad\n"); |
| 249 | goto out; |
| 250 | } |
| 251 | printk(KERN_INFO |
| 252 | "apanic: Marked a bad block" |
| 253 | " @%llx\n", erase.addr); |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 254 | set_bb(erase.addr>>ctx->mtd->erasesize_shift, |
| 255 | apanic_bbt); |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 256 | continue; |
| 257 | } |
| 258 | goto out; |
| 259 | } |
| 260 | schedule(); |
| 261 | remove_wait_queue(&wait_q, &wait); |
| 262 | } |
| 263 | printk(KERN_DEBUG "apanic: %s partition erased\n", |
| 264 | CONFIG_APANIC_PLABEL); |
| 265 | out: |
| 266 | return; |
| 267 | } |
| 268 | |
| 269 | static void apanic_remove_proc_work(struct work_struct *work) |
| 270 | { |
| 271 | struct apanic_data *ctx = &drv_ctx; |
| 272 | |
| 273 | mutex_lock(&drv_mutex); |
| 274 | mtd_panic_erase(); |
| 275 | memset(&ctx->curr, 0, sizeof(struct panic_header)); |
| 276 | if (ctx->apanic_console) { |
| 277 | remove_proc_entry("apanic_console", NULL); |
| 278 | ctx->apanic_console = NULL; |
| 279 | } |
| 280 | if (ctx->apanic_threads) { |
| 281 | remove_proc_entry("apanic_threads", NULL); |
| 282 | ctx->apanic_threads = NULL; |
| 283 | } |
| 284 | mutex_unlock(&drv_mutex); |
| 285 | } |
| 286 | |
| 287 | static int apanic_proc_write(struct file *file, const char __user *buffer, |
| 288 | unsigned long count, void *data) |
| 289 | { |
| 290 | schedule_work(&proc_removal_work); |
| 291 | return count; |
| 292 | } |
| 293 | |
| 294 | static void mtd_panic_notify_add(struct mtd_info *mtd) |
| 295 | { |
| 296 | struct apanic_data *ctx = &drv_ctx; |
| 297 | struct panic_header *hdr = ctx->bounce; |
| 298 | size_t len; |
| 299 | int rc; |
Tom Zhu | 310cd14 | 2009-09-24 10:58:50 -0500 | [diff] [blame] | 300 | int proc_entry_created = 0; |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 301 | |
| 302 | if (strcmp(mtd->name, CONFIG_APANIC_PLABEL)) |
| 303 | return; |
| 304 | |
| 305 | ctx->mtd = mtd; |
| 306 | |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 307 | alloc_bbt(mtd, apanic_bbt); |
| 308 | scan_bbt(mtd, apanic_bbt); |
| 309 | |
| 310 | if (apanic_good_blocks == 0) { |
| 311 | printk(KERN_ERR "apanic: no any good blocks?!\n"); |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 312 | goto out_err; |
| 313 | } |
| 314 | |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 315 | rc = mtd->read(mtd, phy_offset(mtd, 0), mtd->writesize, |
| 316 | &len, ctx->bounce); |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 317 | if (rc && rc == -EBADMSG) { |
| 318 | printk(KERN_WARNING |
| 319 | "apanic: Bad ECC on block 0 (ignored)\n"); |
| 320 | } else if (rc && rc != -EUCLEAN) { |
| 321 | printk(KERN_ERR "apanic: Error reading block 0 (%d)\n", rc); |
| 322 | goto out_err; |
| 323 | } |
| 324 | |
| 325 | if (len != mtd->writesize) { |
| 326 | printk(KERN_ERR "apanic: Bad read size (%d)\n", rc); |
| 327 | goto out_err; |
| 328 | } |
| 329 | |
| 330 | printk(KERN_INFO "apanic: Bound to mtd partition '%s'\n", mtd->name); |
| 331 | |
| 332 | if (hdr->magic != PANIC_MAGIC) { |
| 333 | printk(KERN_INFO "apanic: No panic data available\n"); |
| 334 | mtd_panic_erase(); |
| 335 | return; |
| 336 | } |
| 337 | |
| 338 | if (hdr->version != PHDR_VERSION) { |
| 339 | printk(KERN_INFO "apanic: Version mismatch (%d != %d)\n", |
| 340 | hdr->version, PHDR_VERSION); |
| 341 | mtd_panic_erase(); |
| 342 | return; |
| 343 | } |
| 344 | |
| 345 | memcpy(&ctx->curr, hdr, sizeof(struct panic_header)); |
| 346 | |
| 347 | printk(KERN_INFO "apanic: c(%u, %u) t(%u, %u)\n", |
| 348 | hdr->console_offset, hdr->console_length, |
| 349 | hdr->threads_offset, hdr->threads_length); |
| 350 | |
| 351 | if (hdr->console_length) { |
| 352 | ctx->apanic_console = create_proc_entry("apanic_console", |
| 353 | S_IFREG | S_IRUGO, NULL); |
| 354 | if (!ctx->apanic_console) |
| 355 | printk(KERN_ERR "%s: failed creating procfile\n", |
| 356 | __func__); |
| 357 | else { |
| 358 | ctx->apanic_console->read_proc = apanic_proc_read; |
| 359 | ctx->apanic_console->write_proc = apanic_proc_write; |
| 360 | ctx->apanic_console->size = hdr->console_length; |
| 361 | ctx->apanic_console->data = (void *) 1; |
Tom Zhu | 310cd14 | 2009-09-24 10:58:50 -0500 | [diff] [blame] | 362 | proc_entry_created = 1; |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 363 | } |
| 364 | } |
| 365 | |
| 366 | if (hdr->threads_length) { |
| 367 | ctx->apanic_threads = create_proc_entry("apanic_threads", |
| 368 | S_IFREG | S_IRUGO, NULL); |
| 369 | if (!ctx->apanic_threads) |
| 370 | printk(KERN_ERR "%s: failed creating procfile\n", |
| 371 | __func__); |
| 372 | else { |
| 373 | ctx->apanic_threads->read_proc = apanic_proc_read; |
| 374 | ctx->apanic_threads->write_proc = apanic_proc_write; |
| 375 | ctx->apanic_threads->size = hdr->threads_length; |
| 376 | ctx->apanic_threads->data = (void *) 2; |
Tom Zhu | 310cd14 | 2009-09-24 10:58:50 -0500 | [diff] [blame] | 377 | proc_entry_created = 1; |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 378 | } |
| 379 | } |
| 380 | |
Tom Zhu | 310cd14 | 2009-09-24 10:58:50 -0500 | [diff] [blame] | 381 | if (!proc_entry_created) |
| 382 | mtd_panic_erase(); |
| 383 | |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 384 | return; |
| 385 | out_err: |
| 386 | ctx->mtd = NULL; |
| 387 | } |
| 388 | |
| 389 | static void mtd_panic_notify_remove(struct mtd_info *mtd) |
| 390 | { |
| 391 | struct apanic_data *ctx = &drv_ctx; |
| 392 | if (mtd == ctx->mtd) { |
| 393 | ctx->mtd = NULL; |
| 394 | printk(KERN_INFO "apanic: Unbound from %s\n", mtd->name); |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | static struct mtd_notifier mtd_panic_notifier = { |
| 399 | .add = mtd_panic_notify_add, |
| 400 | .remove = mtd_panic_notify_remove, |
| 401 | }; |
| 402 | |
| 403 | static int in_panic = 0; |
| 404 | |
| 405 | static int apanic_writeflashpage(struct mtd_info *mtd, loff_t to, |
| 406 | const u_char *buf) |
| 407 | { |
| 408 | int rc; |
| 409 | size_t wlen; |
| 410 | int panic = in_interrupt() | in_atomic(); |
| 411 | |
| 412 | if (panic && !mtd->panic_write) { |
| 413 | printk(KERN_EMERG "%s: No panic_write available\n", __func__); |
| 414 | return 0; |
| 415 | } else if (!panic && !mtd->write) { |
| 416 | printk(KERN_EMERG "%s: No write available\n", __func__); |
| 417 | return 0; |
| 418 | } |
| 419 | |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 420 | to = phy_offset(mtd, to); |
| 421 | if (to == APANIC_INVALID_OFFSET) { |
| 422 | printk(KERN_EMERG "apanic: write to invalid address\n"); |
| 423 | return 0; |
| 424 | } |
| 425 | |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 426 | if (panic) |
| 427 | rc = mtd->panic_write(mtd, to, mtd->writesize, &wlen, buf); |
| 428 | else |
| 429 | rc = mtd->write(mtd, to, mtd->writesize, &wlen, buf); |
| 430 | |
| 431 | if (rc) { |
| 432 | printk(KERN_EMERG |
| 433 | "%s: Error writing data to flash (%d)\n", |
| 434 | __func__, rc); |
| 435 | return rc; |
| 436 | } |
| 437 | |
| 438 | return wlen; |
| 439 | } |
| 440 | |
| 441 | extern int log_buf_copy(char *dest, int idx, int len); |
| 442 | extern void log_buf_clear(void); |
| 443 | |
| 444 | /* |
| 445 | * Writes the contents of the console to the specified offset in flash. |
| 446 | * Returns number of bytes written |
| 447 | */ |
| 448 | static int apanic_write_console(struct mtd_info *mtd, unsigned int off) |
| 449 | { |
| 450 | struct apanic_data *ctx = &drv_ctx; |
| 451 | int saved_oip; |
| 452 | int idx = 0; |
| 453 | int rc, rc2; |
| 454 | unsigned int last_chunk = 0; |
| 455 | |
| 456 | while (!last_chunk) { |
| 457 | saved_oip = oops_in_progress; |
| 458 | oops_in_progress = 1; |
| 459 | rc = log_buf_copy(ctx->bounce, idx, mtd->writesize); |
| 460 | if (rc < 0) |
| 461 | break; |
| 462 | |
| 463 | if (rc != mtd->writesize) |
| 464 | last_chunk = rc; |
| 465 | |
| 466 | oops_in_progress = saved_oip; |
| 467 | if (rc <= 0) |
| 468 | break; |
| 469 | if (rc != mtd->writesize) |
| 470 | memset(ctx->bounce + rc, 0, mtd->writesize - rc); |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 471 | |
| 472 | rc2 = apanic_writeflashpage(mtd, off, ctx->bounce); |
| 473 | if (rc2 <= 0) { |
| 474 | printk(KERN_EMERG |
| 475 | "apanic: Flash write failed (%d)\n", rc2); |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 476 | return idx; |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 477 | } |
| 478 | if (!last_chunk) |
| 479 | idx += rc2; |
| 480 | else |
| 481 | idx += last_chunk; |
| 482 | off += rc2; |
| 483 | } |
| 484 | return idx; |
| 485 | } |
| 486 | |
| 487 | static int apanic(struct notifier_block *this, unsigned long event, |
| 488 | void *ptr) |
| 489 | { |
| 490 | struct apanic_data *ctx = &drv_ctx; |
| 491 | struct panic_header *hdr = (struct panic_header *) ctx->bounce; |
| 492 | int console_offset = 0; |
| 493 | int console_len = 0; |
| 494 | int threads_offset = 0; |
| 495 | int threads_len = 0; |
| 496 | int rc; |
| 497 | |
| 498 | if (in_panic) |
| 499 | return NOTIFY_DONE; |
| 500 | in_panic = 1; |
| 501 | #ifdef CONFIG_PREEMPT |
| 502 | /* Ensure that cond_resched() won't try to preempt anybody */ |
| 503 | add_preempt_count(PREEMPT_ACTIVE); |
| 504 | #endif |
Tom Zhu | d2e9d64 | 2009-09-21 16:36:05 -0500 | [diff] [blame] | 505 | touch_softlockup_watchdog(); |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 506 | |
| 507 | if (!ctx->mtd) |
| 508 | goto out; |
| 509 | |
| 510 | if (ctx->curr.magic) { |
| 511 | printk(KERN_EMERG "Crash partition in use!\n"); |
| 512 | goto out; |
| 513 | } |
| 514 | console_offset = ctx->mtd->writesize; |
| 515 | |
| 516 | /* |
| 517 | * Write out the console |
| 518 | */ |
| 519 | console_len = apanic_write_console(ctx->mtd, console_offset); |
| 520 | if (console_len < 0) { |
| 521 | printk(KERN_EMERG "Error writing console to panic log! (%d)\n", |
| 522 | console_len); |
| 523 | console_len = 0; |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * Write out all threads |
| 528 | */ |
| 529 | threads_offset = ALIGN(console_offset + console_len, |
| 530 | ctx->mtd->writesize); |
| 531 | if (!threads_offset) |
| 532 | threads_offset = ctx->mtd->writesize; |
| 533 | |
San Mehat | e3af8d4 | 2009-09-17 14:27:41 -0700 | [diff] [blame] | 534 | ram_console_enable_console(0); |
| 535 | |
San Mehat | 01c9968 | 2009-09-01 13:43:01 -0700 | [diff] [blame] | 536 | log_buf_clear(); |
| 537 | show_state_filter(0); |
| 538 | threads_len = apanic_write_console(ctx->mtd, threads_offset); |
| 539 | if (threads_len < 0) { |
| 540 | printk(KERN_EMERG "Error writing threads to panic log! (%d)\n", |
| 541 | threads_len); |
| 542 | threads_len = 0; |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * Finally write the panic header |
| 547 | */ |
| 548 | memset(ctx->bounce, 0, PAGE_SIZE); |
| 549 | hdr->magic = PANIC_MAGIC; |
| 550 | hdr->version = PHDR_VERSION; |
| 551 | |
| 552 | hdr->console_offset = console_offset; |
| 553 | hdr->console_length = console_len; |
| 554 | |
| 555 | hdr->threads_offset = threads_offset; |
| 556 | hdr->threads_length = threads_len; |
| 557 | |
| 558 | rc = apanic_writeflashpage(ctx->mtd, 0, ctx->bounce); |
| 559 | if (rc <= 0) { |
| 560 | printk(KERN_EMERG "apanic: Header write failed (%d)\n", |
| 561 | rc); |
| 562 | goto out; |
| 563 | } |
| 564 | |
| 565 | printk(KERN_EMERG "apanic: Panic dump sucessfully written to flash\n"); |
| 566 | |
| 567 | out: |
| 568 | #ifdef CONFIG_PREEMPT |
| 569 | sub_preempt_count(PREEMPT_ACTIVE); |
| 570 | #endif |
| 571 | in_panic = 0; |
| 572 | return NOTIFY_DONE; |
| 573 | } |
| 574 | |
| 575 | static struct notifier_block panic_blk = { |
| 576 | .notifier_call = apanic, |
| 577 | }; |
| 578 | |
| 579 | static int panic_dbg_get(void *data, u64 *val) |
| 580 | { |
| 581 | apanic(NULL, 0, NULL); |
| 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | static int panic_dbg_set(void *data, u64 val) |
| 586 | { |
| 587 | BUG(); |
| 588 | return -1; |
| 589 | } |
| 590 | |
| 591 | DEFINE_SIMPLE_ATTRIBUTE(panic_dbg_fops, panic_dbg_get, panic_dbg_set, "%llu\n"); |
| 592 | |
| 593 | int __init apanic_init(void) |
| 594 | { |
| 595 | register_mtd_user(&mtd_panic_notifier); |
| 596 | atomic_notifier_chain_register(&panic_notifier_list, &panic_blk); |
| 597 | debugfs_create_file("apanic", 0644, NULL, NULL, &panic_dbg_fops); |
| 598 | memset(&drv_ctx, 0, sizeof(drv_ctx)); |
| 599 | drv_ctx.bounce = (void *) __get_free_page(GFP_KERNEL); |
| 600 | INIT_WORK(&proc_removal_work, apanic_remove_proc_work); |
| 601 | printk(KERN_INFO "Android kernel panic handler initialized (bind=%s)\n", |
| 602 | CONFIG_APANIC_PLABEL); |
| 603 | return 0; |
| 604 | } |
| 605 | |
| 606 | module_init(apanic_init); |