lib/image-sparse.c

/*
 * Copyright (c) 2009, Google Inc.
 * All rights reserved.
 *
 * Copyright (c) 2009-2014, The Linux Foundation. All rights reserved.
 * Portions Copyright 2014 Broadcom Corporation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of The Linux Foundation nor
 *       the names of its contributors may be used to endorse or promote
 *       products derived from this software without specific prior written
 *       permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * NOTE:
 *   Although it is very similar, this license text is not identical
 *   to the "BSD-3-Clause", therefore, DO NOT MODIFY THIS LICENSE TEXT!
 */

#include <config.h>
#include <blk.h>
#include <image-sparse.h>
#include <div64.h>
#include <log.h>
#include <malloc.h>
#include <part.h>
#include <sparse_format.h>
#include <asm/cache.h>

#include <linux/math64.h>
#include <linux/err.h>

static void default_log(const char *ignored, char *response) {}

static lbaint_t write_sparse_chunk_raw(struct sparse_storage *info,
				       lbaint_t blk, lbaint_t blkcnt,
				       void *data,
				       char *response)
{
	lbaint_t n = blkcnt, write_blks, blks = 0;
	lbaint_t aligned_buf_blks = FASTBOOT_MAX_BLK_WRITE;
	uint32_t *aligned_buf = NULL;

	if (CONFIG_IS_ENABLED(SYS_DCACHE_OFF)) {
		write_blks = info->write(info, blk, n, data);
		if (write_blks < n)
			goto write_fail;

		return write_blks;
	}

	aligned_buf = memalign(ARCH_DMA_MINALIGN, info->blksz * aligned_buf_blks);
	if (!aligned_buf) {
		info->mssg("Malloc failed for: CHUNK_TYPE_RAW", response);
		return -ENOMEM;
	}

	while (blkcnt > 0) {
		n = min(aligned_buf_blks, blkcnt);
		memcpy(aligned_buf, data, n * info->blksz);

		/* write_blks might be > n due to NAND bad-blocks */
		write_blks = info->write(info, blk + blks, n, aligned_buf);
		if (write_blks < n) {
			free(aligned_buf);
			goto write_fail;
		}

		blks += write_blks;
		data += n * info->blksz;
		blkcnt -= n;
	}

	free(aligned_buf);
	return blks;

write_fail:
	if (IS_ERR_VALUE(write_blks)) {
		printf("%s: Write failed, block #" LBAFU " [" LBAFU "] (%lld)\n",
		       __func__, blk + blks, n, (long long)write_blks);
		info->mssg("flash write failure", response);
		return write_blks;
	}

	/* write_blks < n */
	printf("%s: Write failed, block #" LBAFU " [" LBAFU "]\n",
	       __func__, blk + blks, n);
	info->mssg("flash write failure(incomplete)", response);
	return -1;
}

int write_sparse_image(struct sparse_storage *info,
		       const char *part_name, void *data, char *response)
{
	lbaint_t blk;
	lbaint_t blkcnt;
	lbaint_t blks;
	uint64_t bytes_written = 0;
	unsigned int chunk;
	unsigned int offset;
	uint64_t chunk_data_sz;
	uint32_t *fill_buf = NULL;
	uint32_t fill_val;
	sparse_header_t *sparse_header;
	chunk_header_t *chunk_header;
	uint32_t total_blocks = 0;
	int fill_buf_num_blks;
	int i;
	int j;

	fill_buf_num_blks = CONFIG_IMAGE_SPARSE_FILLBUF_SIZE / info->blksz;

	/* Read and skip over sparse image header */
	sparse_header = (sparse_header_t *)data;

	data += sparse_header->file_hdr_sz;
	if (sparse_header->file_hdr_sz > sizeof(sparse_header_t)) {
		/*
		 * Skip the remaining bytes in a header that is longer than
		 * we expected.
		 */
		data += (sparse_header->file_hdr_sz - sizeof(sparse_header_t));
	}

	if (!info->mssg)
		info->mssg = default_log;

	debug("=== Sparse Image Header ===\n");
	debug("magic: 0x%x\n", sparse_header->magic);
	debug("major_version: 0x%x\n", sparse_header->major_version);
	debug("minor_version: 0x%x\n", sparse_header->minor_version);
	debug("file_hdr_sz: %d\n", sparse_header->file_hdr_sz);
	debug("chunk_hdr_sz: %d\n", sparse_header->chunk_hdr_sz);
	debug("blk_sz: %d\n", sparse_header->blk_sz);
	debug("total_blks: %d\n", sparse_header->total_blks);
	debug("total_chunks: %d\n", sparse_header->total_chunks);

	/*
	 * Verify that the sparse block size is a multiple of our
	 * storage backend block size
	 */
	div_u64_rem(sparse_header->blk_sz, info->blksz, &offset);
	if (offset) {
		printf("%s: Sparse image block size issue [%u]\n",
		       __func__, sparse_header->blk_sz);
		info->mssg("sparse image block size issue", response);
		return -1;
	}

	puts("Flashing Sparse Image\n");

	/* Start processing chunks */
	blk = info->start;
	for (chunk = 0; chunk < sparse_header->total_chunks; chunk++) {
		/* Read and skip over chunk header */
		chunk_header = (chunk_header_t *)data;
		data += sizeof(chunk_header_t);

		if (chunk_header->chunk_type != CHUNK_TYPE_RAW) {
			debug("=== Chunk Header ===\n");
			debug("chunk_type: 0x%x\n", chunk_header->chunk_type);
			debug("chunk_data_sz: 0x%x\n", chunk_header->chunk_sz);
			debug("total_size: 0x%x\n", chunk_header->total_sz);
		}

		if (sparse_header->chunk_hdr_sz > sizeof(chunk_header_t)) {
			/*
			 * Skip the remaining bytes in a header that is longer
			 * than we expected.
			 */
			data += (sparse_header->chunk_hdr_sz -
				 sizeof(chunk_header_t));
		}

		chunk_data_sz = ((u64)sparse_header->blk_sz) * chunk_header->chunk_sz;
		blkcnt = DIV_ROUND_UP_ULL(chunk_data_sz, info->blksz);
		switch (chunk_header->chunk_type) {
		case CHUNK_TYPE_RAW:
			if (chunk_header->total_sz !=
			    (sparse_header->chunk_hdr_sz + chunk_data_sz)) {
				info->mssg("Bogus chunk size for chunk type Raw",
					   response);
				return -1;
			}

			if (blk + blkcnt > info->start + info->size) {
				printf(
				    "%s: Request would exceed partition size!\n",
				    __func__);
				info->mssg("Request would exceed partition size!",
					   response);
				return -1;
			}

			blks = write_sparse_chunk_raw(info, blk, blkcnt,
						      data, response);
			if (blks < 0)
				return -1;

			blk += blks;
			bytes_written += ((u64)blkcnt) * info->blksz;
			total_blocks += chunk_header->chunk_sz;
			data += chunk_data_sz;
			break;

		case CHUNK_TYPE_FILL:
			if (chunk_header->total_sz !=
			    (sparse_header->chunk_hdr_sz + sizeof(uint32_t))) {
				info->mssg("Bogus chunk size for chunk type FILL", response);
				return -1;
			}

			fill_buf = (uint32_t *)
				   memalign(ARCH_DMA_MINALIGN,
					    ROUNDUP(
						info->blksz * fill_buf_num_blks,
						ARCH_DMA_MINALIGN));
			if (!fill_buf) {
				info->mssg("Malloc failed for: CHUNK_TYPE_FILL",
					   response);
				return -1;
			}

			fill_val = *(uint32_t *)data;
			data = (char *)data + sizeof(uint32_t);

			for (i = 0;
			     i < (info->blksz * fill_buf_num_blks /
				  sizeof(fill_val));
			     i++)
				fill_buf[i] = fill_val;

			if (blk + blkcnt > info->start + info->size) {
				printf(
				    "%s: Request would exceed partition size!\n",
				    __func__);
				info->mssg("Request would exceed partition size!",
					   response);
				return -1;
			}

			for (i = 0; i < blkcnt;) {
				j = blkcnt - i;
				if (j > fill_buf_num_blks)
					j = fill_buf_num_blks;
				blks = info->write(info, blk, j, fill_buf);
				/* blks might be > j (eg. NAND bad-blocks) */
				if (blks < j) {
					printf("%s: %s " LBAFU " [%d]\n",
					       __func__,
					       "Write failed, block #",
					       blk, j);
					info->mssg("flash write failure",
						   response);
					free(fill_buf);
					return -1;
				}
				blk += blks;
				i += j;
			}
			bytes_written += ((u64)blkcnt) * info->blksz;
			total_blocks += DIV_ROUND_UP_ULL(chunk_data_sz,
							 sparse_header->blk_sz);
			free(fill_buf);
			break;

		case CHUNK_TYPE_DONT_CARE:
			blk += info->reserve(info, blk, blkcnt);
			total_blocks += chunk_header->chunk_sz;
			break;

		case CHUNK_TYPE_CRC32:
			if (chunk_header->total_sz !=
			    sparse_header->chunk_hdr_sz + sizeof(uint32_t)) {
				info->mssg("Bogus chunk size for chunk type CRC32",
					   response);
				return -1;
			}
			total_blocks += chunk_header->chunk_sz;
			data += chunk_data_sz;
			break;

		default:
			printf("%s: Unknown chunk type: %x\n", __func__,
			       chunk_header->chunk_type);
			info->mssg("Unknown chunk type", response);
			return -1;
		}
	}

	debug("Wrote %d blocks, expected to write %d blocks\n",
	      total_blocks, sparse_header->total_blks);
	printf("........ wrote %llu bytes to '%s'\n", bytes_written, part_name);

	if (total_blocks != sparse_header->total_blks) {
		info->mssg("sparse image write failure", response);
		return -1;
	}

	return 0;
}