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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ */
+
+#include <blk.h>
+#include <div64.h>
+#include <fastboot-internal.h>
+#include <fastboot.h>
+#include <fb_block.h>
+#include <image-sparse.h>
+#include <part.h>
+#include <malloc.h>
+
+/**
+ * FASTBOOT_MAX_BLOCKS_ERASE - maximum blocks to erase per derase call
+ *
+ * in the ERASE case we can have much larger buffer size since
+ * we're not transferring an actual buffer
+ */
+#define FASTBOOT_MAX_BLOCKS_ERASE 1048576
+/**
+ * FASTBOOT_MAX_BLOCKS_SOFT_ERASE - maximum blocks to software erase at once
+ */
+#define FASTBOOT_MAX_BLOCKS_SOFT_ERASE 4096
+/**
+ * FASTBOOT_MAX_BLOCKS_WRITE - maximum blocks to write per dwrite call
+ */
+#define FASTBOOT_MAX_BLOCKS_WRITE 65536
+
+struct fb_block_sparse {
+ struct blk_desc *dev_desc;
+};
+
+/* Write 0s instead of using erase operation, inefficient but functional */
+static lbaint_t fb_block_soft_erase(struct blk_desc *block_dev, lbaint_t blk,
+ lbaint_t cur_blkcnt, lbaint_t erase_buf_blks,
+ void *erase_buffer)
+{
+ lbaint_t blks_written = 0;
+ int j;
+
+ memset(erase_buffer, 0, erase_buf_blks * block_dev->blksz);
+
+ for (j = 0; j < cur_blkcnt; j += erase_buf_blks) {
+ lbaint_t remain = min_t(lbaint_t, cur_blkcnt - j,
+ erase_buf_blks);
+
+ blks_written += blk_dwrite(block_dev, blk + j,
+ remain, erase_buffer);
+ printf(".");
+ }
+
+ return blks_written;
+}
+
+static lbaint_t fb_block_write(struct blk_desc *block_dev, lbaint_t start,
+ lbaint_t blkcnt, const void *buffer)
+{
+ lbaint_t blk = start;
+ lbaint_t blks_written = 0;
+ lbaint_t cur_blkcnt = 0;
+ lbaint_t blks = 0;
+ void *erase_buf = NULL;
+ int erase_buf_blks = 0;
+ int step = buffer ? FASTBOOT_MAX_BLOCKS_WRITE : FASTBOOT_MAX_BLOCKS_ERASE;
+ int i;
+
+ for (i = 0; i < blkcnt; i += step) {
+ cur_blkcnt = min((int)blkcnt - i, step);
+ if (buffer) {
+ if (fastboot_progress_callback)
+ fastboot_progress_callback("writing");
+ blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
+ buffer + (i * block_dev->blksz));
+ } else {
+ if (fastboot_progress_callback)
+ fastboot_progress_callback("erasing");
+
+ if (!erase_buf) {
+ blks_written = blk_derase(block_dev, blk, cur_blkcnt);
+
+ /* Allocate erase buffer if erase is not implemented */
+ if ((long)blks_written == -ENOSYS) {
+ erase_buf_blks = min_t(long, blkcnt,
+ FASTBOOT_MAX_BLOCKS_SOFT_ERASE);
+ erase_buf = malloc(erase_buf_blks * block_dev->blksz);
+
+ printf("Slowly writing empty buffers due to missing erase operation\n");
+ }
+ }
+
+ if (erase_buf)
+ blks_written = fb_block_soft_erase(block_dev, blk, cur_blkcnt,
+ erase_buf_blks, erase_buf);
+ }
+ blk += blks_written;
+ blks += blks_written;
+ }
+
+ if (erase_buf)
+ free(erase_buf);
+
+ return blks;
+}
+
+static lbaint_t fb_block_sparse_write(struct sparse_storage *info,
+ lbaint_t blk, lbaint_t blkcnt,
+ const void *buffer)
+{
+ struct fb_block_sparse *sparse = info->priv;
+ struct blk_desc *dev_desc = sparse->dev_desc;
+
+ return fb_block_write(dev_desc, blk, blkcnt, buffer);
+}
+
+static lbaint_t fb_block_sparse_reserve(struct sparse_storage *info,
+ lbaint_t blk, lbaint_t blkcnt)
+{
+ return blkcnt;
+}
+
+int fastboot_block_get_part_info(const char *part_name,
+ struct blk_desc **dev_desc,
+ struct disk_partition *part_info,
+ char *response)
+{
+ int ret;
+ const char *interface = config_opt_enabled(CONFIG_FASTBOOT_FLASH_BLOCK,
+ CONFIG_FASTBOOT_FLASH_BLOCK_INTERFACE_NAME,
+ NULL);
+ const int device = config_opt_enabled(CONFIG_FASTBOOT_FLASH_BLOCK,
+ CONFIG_FASTBOOT_FLASH_BLOCK_DEVICE_ID, -1);
+
+ if (!part_name || !strcmp(part_name, "")) {
+ fastboot_fail("partition not given", response);
+ return -ENOENT;
+ }
+ if (!interface || !strcmp(interface, "")) {
+ fastboot_fail("block interface isn't provided", response);
+ return -EINVAL;
+ }
+
+ *dev_desc = blk_get_dev(interface, device);
+ if (!dev_desc) {
+ fastboot_fail("no such device", response);
+ return -ENODEV;
+ }
+
+ ret = part_get_info_by_name(*dev_desc, part_name, part_info);
+ if (ret < 0)
+ fastboot_fail("failed to get partition info", response);
+
+ return ret;
+}
+
+void fastboot_block_raw_erase_disk(struct blk_desc *dev_desc, const char *disk_name,
+ char *response)
+{
+ lbaint_t written;
+
+ debug("Start Erasing %s...\n", disk_name);
+
+ written = fb_block_write(dev_desc, 0, dev_desc->lba, NULL);
+ if (written != dev_desc->lba) {
+ pr_err("Failed to erase %s\n", disk_name);
+ fastboot_response("FAIL", response, "Failed to erase %s", disk_name);
+ return;
+ }
+
+ printf("........ erased " LBAFU " bytes from '%s'\n",
+ dev_desc->lba * dev_desc->blksz, disk_name);
+ fastboot_okay(NULL, response);
+}
+
+void fastboot_block_raw_erase(struct blk_desc *dev_desc, struct disk_partition *info,
+ const char *part_name, uint alignment, char *response)
+{
+ lbaint_t written, blks_start, blks_size;
+
+ if (alignment) {
+ blks_start = (info->start + alignment - 1) & ~(alignment - 1);
+ if (info->size >= alignment)
+ blks_size = (info->size - (blks_start - info->start)) &
+ (~(alignment - 1));
+ else
+ blks_size = 0;
+
+ printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
+ blks_start, blks_start + blks_size);
+ } else {
+ blks_start = info->start;
+ blks_size = info->size;
+ }
+
+ written = fb_block_write(dev_desc, blks_start, blks_size, NULL);
+ if (written != blks_size) {
+ fastboot_fail("failed to erase partition", response);
+ return;
+ }
+
+ printf("........ erased " LBAFU " bytes from '%s'\n",
+ blks_size * info->blksz, part_name);
+ fastboot_okay(NULL, response);
+}
+
+void fastboot_block_erase(const char *part_name, char *response)
+{
+ struct blk_desc *dev_desc;
+ struct disk_partition part_info;
+
+ if (fastboot_block_get_part_info(part_name, &dev_desc, &part_info, response) < 0)
+ return;
+
+ fastboot_block_raw_erase(dev_desc, &part_info, part_name, 0, response);
+}
+
+void fastboot_block_write_raw_disk(struct blk_desc *dev_desc, const char *disk_name,
+ void *buffer, u32 download_bytes, char *response)
+{
+ lbaint_t blkcnt;
+ lbaint_t blks;
+
+ /* determine number of blocks to write */
+ blkcnt = ((download_bytes + (dev_desc->blksz - 1)) & ~(dev_desc->blksz - 1));
+ blkcnt = lldiv(blkcnt, dev_desc->blksz);
+
+ if (blkcnt > dev_desc->lba) {
+ pr_err("too large for disk: '%s'\n", disk_name);
+ fastboot_fail("too large for disk", response);
+ return;
+ }
+
+ printf("Flashing Raw Image\n");
+
+ blks = fb_block_write(dev_desc, 0, blkcnt, buffer);
+
+ if (blks != blkcnt) {
+ pr_err("failed writing to %s\n", disk_name);
+ fastboot_fail("failed writing to device", response);
+ return;
+ }
+
+ printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * dev_desc->blksz,
+ disk_name);
+ fastboot_okay(NULL, response);
+}
+
+void fastboot_block_write_raw_image(struct blk_desc *dev_desc,
+ struct disk_partition *info, const char *part_name,
+ void *buffer, u32 download_bytes, char *response)
+{
+ lbaint_t blkcnt;
+ lbaint_t blks;
+
+ /* determine number of blocks to write */
+ blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
+ blkcnt = lldiv(blkcnt, info->blksz);
+
+ if (blkcnt > info->size) {
+ pr_err("too large for partition: '%s'\n", part_name);
+ fastboot_fail("too large for partition", response);
+ return;
+ }
+
+ printf("Flashing Raw Image\n");
+
+ blks = fb_block_write(dev_desc, info->start, blkcnt, buffer);
+
+ if (blks != blkcnt) {
+ pr_err("failed writing to device %d\n", dev_desc->devnum);
+ fastboot_fail("failed writing to device", response);
+ return;
+ }
+
+ printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
+ part_name);
+ fastboot_okay(NULL, response);
+}
+
+void fastboot_block_write_sparse_image(struct blk_desc *dev_desc, struct disk_partition *info,
+ const char *part_name, void *buffer, char *response)
+{
+ struct fb_block_sparse sparse_priv;
+ struct sparse_storage sparse;
+ int err;
+
+ sparse_priv.dev_desc = dev_desc;
+
+ sparse.blksz = info->blksz;
+ sparse.start = info->start;
+ sparse.size = info->size;
+ sparse.write = fb_block_sparse_write;
+ sparse.reserve = fb_block_sparse_reserve;
+ sparse.mssg = fastboot_fail;
+
+ printf("Flashing sparse image at offset " LBAFU "\n",
+ sparse.start);
+
+ sparse.priv = &sparse_priv;
+ err = write_sparse_image(&sparse, part_name, buffer,
+ response);
+ if (!err)
+ fastboot_okay(NULL, response);
+}
+
+void fastboot_block_flash_write(const char *part_name, void *download_buffer,
+ u32 download_bytes, char *response)
+{
+ struct blk_desc *dev_desc;
+ struct disk_partition part_info;
+
+ if (fastboot_block_get_part_info(part_name, &dev_desc, &part_info, response) < 0)
+ return;
+
+ if (is_sparse_image(download_buffer)) {
+ fastboot_block_write_sparse_image(dev_desc, &part_info, part_name,
+ download_buffer, response);
+ } else {
+ fastboot_block_write_raw_image(dev_desc, &part_info, part_name,
+ download_buffer, download_bytes, response);
+ }
+}
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ */
+
+#ifndef _FB_BLOCK_H_
+#define _FB_BLOCK_H_
+
+struct blk_desc;
+struct disk_partition;
+
+/**
+ * fastboot_block_get_part_info() - Lookup block partition by name
+ *
+ * @part_name: Named partition to lookup
+ * @dev_desc: Pointer to returned blk_desc pointer
+ * @part_info: Pointer to returned struct disk_partition
+ * @response: Pointer to fastboot response buffer
+ * Return: 0 on success, -ve on error
+ */
+int fastboot_block_get_part_info(const char *part_name,
+ struct blk_desc **dev_desc,
+ struct disk_partition *part_info,
+ char *response);
+
+/**
+ * fastboot_block_raw_erase() - Erase raw block device partition
+ *
+ * @dev_desc: Block device we're going write to
+ * @info: Partition we're going write to
+ * @part_name: Name of partition we're going write to
+ * @alignment: erase start and size alignment, specify 0 to ignore
+ * @response: Pointer to fastboot response buffer
+ */
+void fastboot_block_raw_erase(struct blk_desc *dev_desc, struct disk_partition *info,
+ const char *part_name, uint alignment, char *response);
+
+/**
+ * fastboot_block_raw_erase_disk() - Erase raw block device
+ *
+ * @dev_desc: Block device we're going write to
+ * @disk_name: Name of disk we're going write to
+ * @response: Pointer to fastboot response buffer
+ */
+void fastboot_block_raw_erase_disk(struct blk_desc *dev_desc, const char *disk_name,
+ char *response);
+
+/**
+ * fastboot_block_erase() - Erase partition on block device for fastboot
+ *
+ * @part_name: Named partition to erase
+ * @response: Pointer to fastboot response buffer
+ */
+void fastboot_block_erase(const char *part_name, char *response);
+
+/**
+ * fastboot_block_write_raw_disk() - Write raw image to block device
+ *
+ * @dev_desc: Block device we're going write to
+ * @disk_name: Name of disk we're going write to
+ * @buffer: Downloaded buffer pointer
+ * @download_bytes: Size of content on downloaded buffer pointer
+ * @response: Pointer to fastboot response buffer
+ */
+void fastboot_block_write_raw_disk(struct blk_desc *dev_desc, const char *disk_name,
+ void *buffer, u32 download_bytes, char *response);
+
+/**
+ * fastboot_block_write_raw_image() - Write raw image to block device partition
+ *
+ * @dev_desc: Block device we're going write to
+ * @info: Partition we're going write to
+ * @part_name: Name of partition we're going write to
+ * @buffer: Downloaded buffer pointer
+ * @download_bytes: Size of content on downloaded buffer pointer
+ * @response: Pointer to fastboot response buffer
+ */
+void fastboot_block_write_raw_image(struct blk_desc *dev_desc,
+ struct disk_partition *info, const char *part_name,
+ void *buffer, u32 download_bytes, char *response);
+
+/**
+ * fastboot_block_write_sparse_image() - Write sparse image to block device partition
+ *
+ * @dev_desc: Block device we're going write to
+ * @info: Partition we're going write to
+ * @part_name: Name of partition we're going write to
+ * @buffer: Downloaded buffer pointer
+ * @response: Pointer to fastboot response buffer
+ */
+void fastboot_block_write_sparse_image(struct blk_desc *dev_desc, struct disk_partition *info,
+ const char *part_name, void *buffer, char *response);
+
+/**
+ * fastboot_block_flash_write() - Write image to block device for fastboot
+ *
+ * @part_name: Named partition to write image to
+ * @download_buffer: Pointer to image data
+ * @download_bytes: Size of image data
+ * @response: Pointer to fastboot response buffer
+ */
+void fastboot_block_flash_write(const char *part_name, void *download_buffer,
+ u32 download_bytes, char *response);
+
+#endif // _FB_BLOCK_H_