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![Stephen Warren](/assets/img/avatar_default.png)
When writing to files in a filesystem on MMC, dfu_mmc.c buffers up the entire file content until the end of the transaction, at which point the file is written in one go. This allows writing files larger than the USB transfer size (CONFIG_SYS_DFU_DATA_BUF_SIZE); the maximum written file size is CONFIG_SYS_DFU_MAX_FILE_SIZE (the size of the temporary buffer). The current file reading code does not do any buffering, and so limits the maximum read file size to the USB transfer size. Enhance the code to do the same kind of buffering as the write path, so the same file size limits apply. Remove the size checking code from dfu_read() since all read paths now support larger files than the USB transfer buffer. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Lukasz Majewski <l.majewski@samsung.com> Tested-by: Lukasz Majewski <l.majewski@samsung.com>
420 lines
9.2 KiB
C
420 lines
9.2 KiB
C
/*
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* dfu.c -- DFU back-end routines
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*
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* Copyright (C) 2012 Samsung Electronics
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* author: Lukasz Majewski <l.majewski@samsung.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <malloc.h>
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#include <errno.h>
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#include <div64.h>
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#include <dfu.h>
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#include <ext4fs.h>
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#include <fat.h>
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#include <mmc.h>
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static unsigned char *dfu_file_buf;
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static long dfu_file_buf_len;
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static long dfu_file_buf_filled;
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static int mmc_access_part(struct dfu_entity *dfu, struct mmc *mmc, int part)
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{
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int ret;
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if (part == mmc->part_num)
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return 0;
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ret = mmc_switch_part(dfu->data.mmc.dev_num, part);
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if (ret) {
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error("Cannot switch to partition %d\n", part);
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return ret;
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}
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mmc->part_num = part;
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return 0;
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}
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static int mmc_block_op(enum dfu_op op, struct dfu_entity *dfu,
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u64 offset, void *buf, long *len)
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{
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struct mmc *mmc;
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u32 blk_start, blk_count, n = 0;
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int ret, part_num_bkp = 0;
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mmc = find_mmc_device(dfu->data.mmc.dev_num);
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if (!mmc) {
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error("Device MMC %d - not found!", dfu->data.mmc.dev_num);
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return -ENODEV;
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}
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/*
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* We must ensure that we work in lba_blk_size chunks, so ALIGN
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* this value.
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*/
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*len = ALIGN(*len, dfu->data.mmc.lba_blk_size);
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blk_start = dfu->data.mmc.lba_start +
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(u32)lldiv(offset, dfu->data.mmc.lba_blk_size);
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blk_count = *len / dfu->data.mmc.lba_blk_size;
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if (blk_start + blk_count >
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dfu->data.mmc.lba_start + dfu->data.mmc.lba_size) {
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puts("Request would exceed designated area!\n");
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return -EINVAL;
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}
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if (dfu->data.mmc.hw_partition >= 0) {
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part_num_bkp = mmc->part_num;
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ret = mmc_access_part(dfu, mmc, dfu->data.mmc.hw_partition);
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if (ret)
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return ret;
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}
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debug("%s: %s dev: %d start: %d cnt: %d buf: 0x%p\n", __func__,
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op == DFU_OP_READ ? "MMC READ" : "MMC WRITE",
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dfu->data.mmc.dev_num, blk_start, blk_count, buf);
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switch (op) {
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case DFU_OP_READ:
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n = mmc->block_dev.block_read(dfu->data.mmc.dev_num, blk_start,
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blk_count, buf);
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break;
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case DFU_OP_WRITE:
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n = mmc->block_dev.block_write(dfu->data.mmc.dev_num, blk_start,
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blk_count, buf);
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break;
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default:
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error("Operation not supported\n");
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}
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if (n != blk_count) {
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error("MMC operation failed");
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if (dfu->data.mmc.hw_partition >= 0)
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mmc_access_part(dfu, mmc, part_num_bkp);
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return -EIO;
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}
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if (dfu->data.mmc.hw_partition >= 0) {
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ret = mmc_access_part(dfu, mmc, part_num_bkp);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int mmc_file_buffer(struct dfu_entity *dfu, void *buf, long *len)
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{
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if (dfu_file_buf_len + *len > CONFIG_SYS_DFU_MAX_FILE_SIZE) {
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dfu_file_buf_len = 0;
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return -EINVAL;
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}
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/* Add to the current buffer. */
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memcpy(dfu_file_buf + dfu_file_buf_len, buf, *len);
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dfu_file_buf_len += *len;
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return 0;
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}
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static int mmc_file_op(enum dfu_op op, struct dfu_entity *dfu,
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void *buf, long *len)
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{
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const char *fsname, *opname;
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char cmd_buf[DFU_CMD_BUF_SIZE];
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char *str_env;
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int ret;
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switch (dfu->layout) {
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case DFU_FS_FAT:
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fsname = "fat";
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break;
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case DFU_FS_EXT4:
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fsname = "ext4";
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break;
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default:
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printf("%s: Layout (%s) not (yet) supported!\n", __func__,
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dfu_get_layout(dfu->layout));
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return -1;
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}
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switch (op) {
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case DFU_OP_READ:
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opname = "load";
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break;
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case DFU_OP_WRITE:
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opname = "write";
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break;
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case DFU_OP_SIZE:
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opname = "size";
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break;
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default:
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return -1;
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}
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sprintf(cmd_buf, "%s%s mmc %d:%d", fsname, opname,
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dfu->data.mmc.dev, dfu->data.mmc.part);
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if (op != DFU_OP_SIZE)
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sprintf(cmd_buf + strlen(cmd_buf), " %p", buf);
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sprintf(cmd_buf + strlen(cmd_buf), " %s", dfu->name);
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if (op == DFU_OP_WRITE)
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sprintf(cmd_buf + strlen(cmd_buf), " %lx", *len);
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debug("%s: %s 0x%p\n", __func__, cmd_buf, cmd_buf);
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ret = run_command(cmd_buf, 0);
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if (ret) {
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puts("dfu: Read error!\n");
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return ret;
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}
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if (op != DFU_OP_WRITE) {
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str_env = getenv("filesize");
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if (str_env == NULL) {
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puts("dfu: Wrong file size!\n");
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return -1;
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}
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*len = simple_strtoul(str_env, NULL, 16);
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}
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return ret;
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}
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int dfu_write_medium_mmc(struct dfu_entity *dfu,
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u64 offset, void *buf, long *len)
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{
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int ret = -1;
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switch (dfu->layout) {
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case DFU_RAW_ADDR:
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ret = mmc_block_op(DFU_OP_WRITE, dfu, offset, buf, len);
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break;
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case DFU_FS_FAT:
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case DFU_FS_EXT4:
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ret = mmc_file_buffer(dfu, buf, len);
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break;
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default:
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printf("%s: Layout (%s) not (yet) supported!\n", __func__,
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dfu_get_layout(dfu->layout));
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}
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return ret;
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}
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int dfu_flush_medium_mmc(struct dfu_entity *dfu)
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{
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int ret = 0;
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if (dfu->layout != DFU_RAW_ADDR) {
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/* Do stuff here. */
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ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf,
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&dfu_file_buf_len);
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/* Now that we're done */
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dfu_file_buf_len = 0;
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}
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return ret;
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}
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long dfu_get_medium_size_mmc(struct dfu_entity *dfu)
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{
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int ret;
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long len;
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switch (dfu->layout) {
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case DFU_RAW_ADDR:
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return dfu->data.mmc.lba_size * dfu->data.mmc.lba_blk_size;
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case DFU_FS_FAT:
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case DFU_FS_EXT4:
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dfu_file_buf_filled = -1;
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ret = mmc_file_op(DFU_OP_SIZE, dfu, NULL, &len);
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if (ret < 0)
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return ret;
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if (len > CONFIG_SYS_DFU_MAX_FILE_SIZE)
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return -1;
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return len;
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default:
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printf("%s: Layout (%s) not (yet) supported!\n", __func__,
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dfu_get_layout(dfu->layout));
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return -1;
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}
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}
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static int mmc_file_unbuffer(struct dfu_entity *dfu, u64 offset, void *buf,
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long *len)
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{
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int ret;
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long file_len;
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if (dfu_file_buf_filled == -1) {
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ret = mmc_file_op(DFU_OP_READ, dfu, dfu_file_buf, &file_len);
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if (ret < 0)
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return ret;
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dfu_file_buf_filled = file_len;
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}
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if (offset + *len > dfu_file_buf_filled)
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return -EINVAL;
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/* Add to the current buffer. */
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memcpy(buf, dfu_file_buf + offset, *len);
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return 0;
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}
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int dfu_read_medium_mmc(struct dfu_entity *dfu, u64 offset, void *buf,
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long *len)
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{
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int ret = -1;
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switch (dfu->layout) {
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case DFU_RAW_ADDR:
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ret = mmc_block_op(DFU_OP_READ, dfu, offset, buf, len);
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break;
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case DFU_FS_FAT:
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case DFU_FS_EXT4:
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ret = mmc_file_unbuffer(dfu, offset, buf, len);
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break;
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default:
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printf("%s: Layout (%s) not (yet) supported!\n", __func__,
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dfu_get_layout(dfu->layout));
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}
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return ret;
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}
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void dfu_free_entity_mmc(struct dfu_entity *dfu)
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{
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if (dfu_file_buf) {
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free(dfu_file_buf);
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dfu_file_buf = NULL;
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}
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}
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/*
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* @param s Parameter string containing space-separated arguments:
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* 1st:
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* raw (raw read/write)
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* fat (files)
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* ext4 (^)
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* part (partition image)
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* 2nd and 3rd:
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* lba_start and lba_size, for raw write
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* mmc_dev and mmc_part, for filesystems and part
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* 4th (optional):
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* mmcpart <num> (access to HW eMMC partitions)
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*/
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int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
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{
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const char *entity_type;
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size_t second_arg;
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size_t third_arg;
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struct mmc *mmc;
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const char *argv[3];
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const char **parg = argv;
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dfu->data.mmc.dev_num = simple_strtoul(devstr, NULL, 10);
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for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
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*parg = strsep(&s, " ");
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if (*parg == NULL) {
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error("Invalid number of arguments.\n");
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return -ENODEV;
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}
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}
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entity_type = argv[0];
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/*
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* Base 0 means we'll accept (prefixed with 0x or 0) base 16, 8,
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* with default 10.
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*/
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second_arg = simple_strtoul(argv[1], NULL, 0);
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third_arg = simple_strtoul(argv[2], NULL, 0);
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mmc = find_mmc_device(dfu->data.mmc.dev_num);
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if (mmc == NULL) {
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error("Couldn't find MMC device no. %d.\n",
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dfu->data.mmc.dev_num);
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return -ENODEV;
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}
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if (mmc_init(mmc)) {
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error("Couldn't init MMC device.\n");
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return -ENODEV;
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}
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dfu->data.mmc.hw_partition = -EINVAL;
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if (!strcmp(entity_type, "raw")) {
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dfu->layout = DFU_RAW_ADDR;
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dfu->data.mmc.lba_start = second_arg;
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dfu->data.mmc.lba_size = third_arg;
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dfu->data.mmc.lba_blk_size = mmc->read_bl_len;
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/*
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* Check for an extra entry at dfu_alt_info env variable
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* specifying the mmc HW defined partition number
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*/
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if (s)
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if (!strcmp(strsep(&s, " "), "mmcpart"))
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dfu->data.mmc.hw_partition =
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simple_strtoul(s, NULL, 0);
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} else if (!strcmp(entity_type, "part")) {
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disk_partition_t partinfo;
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block_dev_desc_t *blk_dev = &mmc->block_dev;
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int mmcdev = second_arg;
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int mmcpart = third_arg;
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if (get_partition_info(blk_dev, mmcpart, &partinfo) != 0) {
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error("Couldn't find part #%d on mmc device #%d\n",
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mmcpart, mmcdev);
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return -ENODEV;
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}
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dfu->layout = DFU_RAW_ADDR;
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dfu->data.mmc.lba_start = partinfo.start;
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dfu->data.mmc.lba_size = partinfo.size;
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dfu->data.mmc.lba_blk_size = partinfo.blksz;
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} else if (!strcmp(entity_type, "fat")) {
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dfu->layout = DFU_FS_FAT;
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} else if (!strcmp(entity_type, "ext4")) {
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dfu->layout = DFU_FS_EXT4;
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} else {
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error("Memory layout (%s) not supported!\n", entity_type);
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return -ENODEV;
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}
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/* if it's NOT a raw write */
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if (strcmp(entity_type, "raw")) {
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dfu->data.mmc.dev = second_arg;
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dfu->data.mmc.part = third_arg;
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}
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dfu->dev_type = DFU_DEV_MMC;
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dfu->get_medium_size = dfu_get_medium_size_mmc;
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dfu->read_medium = dfu_read_medium_mmc;
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dfu->write_medium = dfu_write_medium_mmc;
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dfu->flush_medium = dfu_flush_medium_mmc;
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dfu->inited = 0;
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dfu->free_entity = dfu_free_entity_mmc;
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/* Check if file buffer is ready */
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if (!dfu_file_buf) {
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dfu_file_buf = memalign(CONFIG_SYS_CACHELINE_SIZE,
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CONFIG_SYS_DFU_MAX_FILE_SIZE);
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if (!dfu_file_buf) {
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error("Could not memalign 0x%x bytes",
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CONFIG_SYS_DFU_MAX_FILE_SIZE);
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return -ENOMEM;
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}
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}
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return 0;
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}
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