common/image-sparse.c

   1 /*
   2  * Copyright (c) 2009, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Copyright (c) 2009-2014, The Linux Foundation. All rights reserved.
   6  * Portions Copyright 2014 Broadcom Corporation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in the
  14  *       documentation and/or other materials provided with the distribution.
  15  *     * Neither the name of The Linux Foundation nor
  16  *       the names of its contributors may be used to endorse or promote
  17  *       products derived from this software without specific prior written
  18  *       permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23  * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  27  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  28  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  30  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * NOTE:
  33  *   Although it is very similar, this license text is not identical
  34  *   to the "BSD-3-Clause", therefore, DO NOT MODIFY THIS LICENSE TEXT!
  35  */
  36
  37 #include <config.h>
  38 #include <common.h>
  39 #include <div64.h>
  40 #include <errno.h>
  41 #include <image-sparse.h>
  42 #include <malloc.h>
  43 #include <part.h>
  44 #include <sparse_format.h>
  45
  46 #include <linux/math64.h>
  47
  48 typedef struct sparse_buffer {
  49         void    *data;
  50         u32     length;
  51         u32     repeat;
  52         u16     type;
  53 } sparse_buffer_t;
  54
  55 static uint32_t last_offset;
  56
  57 static unsigned int sparse_get_chunk_data_size(sparse_header_t *sparse,
  58                                                chunk_header_t *chunk)
  59 {
  60         return chunk->total_sz - sparse->chunk_hdr_sz;
  61 }
  62
  63 static unsigned int sparse_block_size_to_storage(unsigned int size,
  64                                                  sparse_storage_t *storage,
  65                                                  sparse_header_t *sparse)
  66 {
  67         return size * sparse->blk_sz / storage->block_sz;
  68 }
  69
  70 static bool sparse_chunk_has_buffer(chunk_header_t *chunk)
  71 {
  72         switch (chunk->chunk_type) {
  73         case CHUNK_TYPE_RAW:
  74         case CHUNK_TYPE_FILL:
  75                 return true;
  76
  77         default:
  78                 return false;
  79         }
  80 }
  81
  82 static sparse_header_t *sparse_parse_header(void **data)
  83 {
  84         /* Read and skip over sparse image header */
  85         sparse_header_t *sparse_header = (sparse_header_t *) *data;
  86
  87         *data += sparse_header->file_hdr_sz;
  88
  89         debug("=== Sparse Image Header ===\n");
  90         debug("magic: 0x%x\n", sparse_header->magic);
  91         debug("major_version: 0x%x\n", sparse_header->major_version);
  92         debug("minor_version: 0x%x\n", sparse_header->minor_version);
  93         debug("file_hdr_sz: %d\n", sparse_header->file_hdr_sz);
  94         debug("chunk_hdr_sz: %d\n", sparse_header->chunk_hdr_sz);
  95         debug("blk_sz: %d\n", sparse_header->blk_sz);
  96         debug("total_blks: %d\n", sparse_header->total_blks);
  97         debug("total_chunks: %d\n", sparse_header->total_chunks);
  98
  99         return sparse_header;
 100 }
 101
 102 static int sparse_parse_fill_chunk(sparse_header_t *sparse,
 103                                    chunk_header_t *chunk)
 104 {
 105         unsigned int chunk_data_sz = sparse_get_chunk_data_size(sparse, chunk);
 106
 107         if (chunk_data_sz != sizeof(uint32_t))
 108                 return -EINVAL;
 109
 110         return 0;
 111 }
 112
 113 static int sparse_parse_raw_chunk(sparse_header_t *sparse,
 114                                   chunk_header_t *chunk)
 115 {
 116         unsigned int chunk_data_sz = sparse_get_chunk_data_size(sparse, chunk);
 117
 118         /* Check if the data size is a multiple of the main block size */
 119         if (chunk_data_sz % sparse->blk_sz)
 120                 return -EINVAL;
 121
 122         /* Check that the chunk size is consistent */
 123         if ((chunk_data_sz / sparse->blk_sz) != chunk->chunk_sz)
 124                 return -EINVAL;
 125
 126         return 0;
 127 }
 128
 129 static chunk_header_t *sparse_parse_chunk(sparse_header_t *sparse,
 130                                           void **image)
 131 {
 132         chunk_header_t *chunk = (chunk_header_t *) *image;
 133         int ret;
 134
 135         debug("=== Chunk Header ===\n");
 136         debug("chunk_type: 0x%x\n", chunk->chunk_type);
 137         debug("chunk_data_sz: 0x%x\n", chunk->chunk_sz);
 138         debug("total_size: 0x%x\n", chunk->total_sz);
 139
 140         switch (chunk->chunk_type) {
 141         case CHUNK_TYPE_RAW:
 142                 ret = sparse_parse_raw_chunk(sparse, chunk);
 143                 if (ret)
 144                         return NULL;
 145                 break;
 146
 147         case CHUNK_TYPE_FILL:
 148                 ret = sparse_parse_fill_chunk(sparse, chunk);
 149                 if (ret)
 150                         return NULL;
 151                 break;
 152
 153         case CHUNK_TYPE_DONT_CARE:
 154         case CHUNK_TYPE_CRC32:
 155                 debug("Ignoring chunk\n");
 156                 break;
 157
 158         default:
 159                 printf("%s: Unknown chunk type: %x\n", __func__,
 160                        chunk->chunk_type);
 161                 return NULL;
 162         }
 163
 164         *image += sparse->chunk_hdr_sz;
 165
 166         return chunk;
 167 }
 168
 169 static int sparse_get_fill_buffer(sparse_header_t *sparse,
 170                                   chunk_header_t *chunk,
 171                                   sparse_buffer_t *buffer,
 172                                   unsigned int blk_sz,
 173                                   void *data)
 174 {
 175         int i;
 176
 177         buffer->type = CHUNK_TYPE_FILL;
 178
 179         /*
 180          * We create a buffer of one block, and ask it to be
 181          * repeated as many times as needed.
 182          */
 183         buffer->length = blk_sz;
 184         buffer->repeat = (chunk->chunk_sz * sparse->blk_sz) / blk_sz;
 185
 186         buffer->data = memalign(ARCH_DMA_MINALIGN,
 187                                 ROUNDUP(blk_sz,
 188                                         ARCH_DMA_MINALIGN));
 189         if (!buffer->data)
 190                 return -ENOMEM;
 191
 192         for (i = 0; i < (buffer->length / sizeof(uint32_t)); i++)
 193                 ((uint32_t *)buffer->data)[i] = *(uint32_t *)(data);
 194
 195         return 0;
 196 }
 197
 198 static int sparse_get_raw_buffer(sparse_header_t *sparse,
 199                                  chunk_header_t *chunk,
 200                                  sparse_buffer_t *buffer,
 201                                  unsigned int blk_sz,
 202                                  void *data)
 203 {
 204         unsigned int chunk_data_sz = sparse_get_chunk_data_size(sparse, chunk);
 205
 206         buffer->type = CHUNK_TYPE_RAW;
 207         buffer->length = chunk_data_sz;
 208         buffer->data = data;
 209         buffer->repeat = 1;
 210
 211         return 0;
 212 }
 213
 214 static sparse_buffer_t *sparse_get_data_buffer(sparse_header_t *sparse,
 215                                                chunk_header_t *chunk,
 216                                                unsigned int blk_sz,
 217                                                void **image)
 218 {
 219         unsigned int chunk_data_sz = sparse_get_chunk_data_size(sparse, chunk);
 220         sparse_buffer_t *buffer;
 221         void *data = *image;
 222         int ret;
 223
 224         *image += chunk_data_sz;
 225
 226         if (!sparse_chunk_has_buffer(chunk))
 227                 return NULL;
 228
 229         buffer = calloc(sizeof(sparse_buffer_t), 1);
 230         if (!buffer)
 231                 return NULL;
 232
 233         switch (chunk->chunk_type) {
 234         case CHUNK_TYPE_RAW:
 235                 ret = sparse_get_raw_buffer(sparse, chunk, buffer, blk_sz,
 236                                             data);
 237                 if (ret)
 238                         return NULL;
 239                 break;
 240
 241         case CHUNK_TYPE_FILL:
 242                 ret = sparse_get_fill_buffer(sparse, chunk, buffer, blk_sz,
 243                                              data);
 244                 if (ret)
 245                         return NULL;
 246                 break;
 247
 248         default:
 249                 return NULL;
 250         }
 251
 252         debug("=== Buffer ===\n");
 253         debug("length: 0x%x\n", buffer->length);
 254         debug("repeat: 0x%x\n", buffer->repeat);
 255         debug("type: 0x%x\n", buffer->type);
 256         debug("data: 0x%p\n", buffer->data);
 257
 258         return buffer;
 259 }
 260
 261 static void sparse_put_data_buffer(sparse_buffer_t *buffer)
 262 {
 263         if (buffer->type == CHUNK_TYPE_FILL)
 264                 free(buffer->data);
 265
 266         free(buffer);
 267 }
 268
 269 int store_sparse_image(sparse_storage_t *storage, void *storage_priv,
 270                        unsigned int session_id, void *data)
 271 {
 272         unsigned int chunk, offset;
 273         sparse_header_t *sparse_header;
 274         chunk_header_t *chunk_header;
 275         sparse_buffer_t *buffer;
 276         uint32_t start;
 277         uint32_t total_blocks = 0;
 278         uint32_t skipped = 0;
 279         int i;
 280
 281         debug("=== Storage ===\n");
 282         debug("name: %s\n", storage->name);
 283         debug("block_size: 0x%x\n", storage->block_sz);
 284         debug("start: 0x%x\n", storage->start);
 285         debug("size: 0x%x\n", storage->size);
 286         debug("write: 0x%p\n", storage->write);
 287         debug("priv: 0x%p\n", storage_priv);
 288
 289         sparse_header = sparse_parse_header(&data);
 290         if (!sparse_header) {
 291                 printf("sparse header issue\n");
 292                 return -EINVAL;
 293         }
 294
 295         /*
 296          * Verify that the sparse block size is a multiple of our
 297          * storage backend block size
 298          */
 299         div_u64_rem(sparse_header->blk_sz, storage->block_sz, &offset);
 300         if (offset) {
 301                 printf("%s: Sparse image block size issue [%u]\n",
 302                        __func__, sparse_header->blk_sz);
 303                 return -EINVAL;
 304         }
 305
 306         /*
 307          * If it's a new flashing session, start at the beginning of
 308          * the partition. If not, then simply resume where we were.
 309          */
 310         if (session_id > 0)
 311                 start = last_offset;
 312         else
 313                 start = storage->start;
 314
 315         printf("Flashing sparse image on partition %s at offset 0x%x (ID: %d)\n",
 316                storage->name, start * storage->block_sz, session_id);
 317
 318         /* Start processing chunks */
 319         for (chunk = 0; chunk < sparse_header->total_chunks; chunk++) {
 320                 uint32_t blkcnt;
 321
 322                 chunk_header = sparse_parse_chunk(sparse_header, &data);
 323                 if (!chunk_header) {
 324                         printf("Unknown chunk type");
 325                         return -EINVAL;
 326                 }
 327
 328                 /*
 329                  * If we have a DONT_CARE type, just skip the blocks
 330                  * and go on parsing the rest of the chunks
 331                  */
 332                 if (chunk_header->chunk_type == CHUNK_TYPE_DONT_CARE) {
 333                         skipped += sparse_block_size_to_storage(chunk_header->chunk_sz,
 334                                                                 storage,
 335                                                                 sparse_header);
 336                         continue;
 337                 }
 338
 339                 /* Retrieve the buffer we're going to write */
 340                 buffer = sparse_get_data_buffer(sparse_header, chunk_header,
 341                                                 storage->block_sz, &data);
 342                 if (!buffer)
 343                         continue;
 344
 345                 blkcnt = (buffer->length / storage->block_sz) * buffer->repeat;
 346
 347                 if ((start + total_blocks + blkcnt) >
 348                     (storage->start + storage->size)) {
 349                         printf("%s: Request would exceed partition size!\n",
 350                                __func__);
 351                         return -EINVAL;
 352                 }
 353
 354                 for (i = 0; i < buffer->repeat; i++) {
 355                         unsigned long buffer_blk_cnt;
 356                         int ret;
 357
 358                         buffer_blk_cnt = buffer->length / storage->block_sz;
 359
 360                         ret = storage->write(storage, storage_priv,
 361                                              start + total_blocks,
 362                                              buffer_blk_cnt,
 363                                              buffer->data);
 364                         if (ret < 0) {
 365                                 printf("%s: Write %d failed %d\n",
 366                                        __func__, i, ret);
 367                                 return ret;
 368                         }
 369
 370                         total_blocks += ret;
 371                 }
 372
 373                 sparse_put_data_buffer(buffer);
 374         }
 375
 376         debug("Wrote %d blocks, skipped %d, expected to write %d blocks\n",
 377               total_blocks, skipped,
 378               sparse_block_size_to_storage(sparse_header->total_blks,
 379                                            storage, sparse_header));
 380         printf("........ wrote %d blocks to '%s'\n", total_blocks,
 381                storage->name);
 382
 383         if ((total_blocks + skipped) !=
 384             sparse_block_size_to_storage(sparse_header->total_blks,
 385                                          storage, sparse_header)) {
 386                 printf("sparse image write failure\n");
 387                 return -EIO;
 388         }
 389
 390         last_offset = start + total_blocks;
 391
 392         return 0;
 393 }