| Sughosh Ganu | 60475ca | 2022-10-21 18:15:59 +0530 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Copyright (c) 2022, Linaro Limited |
| 4 | */ |
| 5 | |
| 6 | #include <blk.h> |
| 7 | #include <dfu.h> |
| 8 | #include <efi.h> |
| 9 | #include <efi_loader.h> |
| 10 | #include <fwu.h> |
| 11 | #include <log.h> |
| 12 | #include <part.h> |
| 13 | |
| 14 | #include <linux/errno.h> |
| 15 | |
| 16 | static int get_gpt_dfu_identifier(struct blk_desc *desc, efi_guid_t *image_guid) |
| 17 | { |
| 18 | int i; |
| 19 | struct disk_partition info; |
| 20 | efi_guid_t unique_part_guid; |
| 21 | |
| 22 | for (i = 1; i < MAX_SEARCH_PARTITIONS; i++) { |
| 23 | if (part_get_info(desc, i, &info)) |
| 24 | continue; |
| 25 | uuid_str_to_bin(info.uuid, unique_part_guid.b, |
| 26 | UUID_STR_FORMAT_GUID); |
| 27 | |
| 28 | if (!guidcmp(&unique_part_guid, image_guid)) |
| 29 | return i; |
| 30 | } |
| 31 | |
| 32 | log_err("No partition found with image_guid %pUs\n", image_guid); |
| 33 | return -ENOENT; |
| 34 | } |
| 35 | |
| 36 | static int fwu_alt_num_for_dfu_dev(struct dfu_entity *dfu, int dev_num, |
| 37 | int part, unsigned char dfu_dev, |
| 38 | u8 *alt_num) |
| 39 | { |
| 40 | int ret; |
| 41 | |
| 42 | switch(dfu_dev) { |
| 43 | case DFU_DEV_MMC: |
| 44 | if (dfu->layout == DFU_RAW_ADDR && |
| 45 | dfu->data.mmc.dev_num == dev_num && |
| 46 | dfu->data.mmc.part == part) { |
| 47 | *alt_num = dfu->alt; |
| 48 | ret = 0; |
| 49 | } else { |
| 50 | ret = -ENOENT; |
| 51 | } |
| 52 | break; |
| 53 | default: |
| 54 | ret = -ENOENT; |
| 55 | } |
| 56 | |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | static int fwu_gpt_get_alt_num(struct blk_desc *desc, efi_guid_t *image_guid, |
| 61 | u8 *alt_num, unsigned char dfu_dev) |
| 62 | { |
| 63 | int ret = -1; |
| 64 | int i, part, dev_num; |
| 65 | struct dfu_entity *dfu; |
| 66 | |
| 67 | dev_num = desc->devnum; |
| 68 | part = get_gpt_dfu_identifier(desc, image_guid); |
| 69 | if (part < 0) |
| 70 | return -ENOENT; |
| 71 | |
| 72 | ret = dfu_init_env_entities(NULL, NULL); |
| 73 | if (ret) |
| 74 | goto out; |
| 75 | |
| 76 | i = 0; |
| 77 | while (true) { |
| 78 | dfu = dfu_get_entity(i++); |
| 79 | if (!dfu) { |
| 80 | ret = -ENOENT; |
| 81 | break; |
| 82 | } |
| 83 | |
| 84 | if (dfu->dev_type != dfu_dev) |
| 85 | continue; |
| 86 | |
| 87 | ret = fwu_alt_num_for_dfu_dev(dfu, dev_num, part, dfu_dev, |
| 88 | alt_num); |
| 89 | if (!ret) |
| 90 | break; |
| 91 | } |
| 92 | |
| 93 | out: |
| 94 | dfu_free_entities(); |
| 95 | |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * fwu_plat_get_alt_num() - Get the DFU alt number |
| 101 | * @dev: FWU metadata device |
| 102 | * @image_guid: GUID value of the image for which the alt num is to |
| 103 | * be obtained |
| 104 | * @alt_num: The DFU alt number for the image that is to be updated |
| 105 | * |
| 106 | * Get the DFU alt number for the image that is to be updated. The |
| 107 | * image is identified with the image_guid parameter that is passed |
| 108 | * to the function. |
| 109 | * |
| 110 | * Note: This is a weak function and platforms can override this with |
| 111 | * their own implementation for obtaining the alt number value. |
| 112 | * |
| 113 | * Return: 0 if OK, -ve on error |
| 114 | * |
| 115 | */ |
| 116 | __weak int fwu_plat_get_alt_num(struct udevice *dev, efi_guid_t *image_guid, |
| 117 | u8 *alt_num) |
| 118 | { |
| 119 | struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev); |
| 120 | |
| 121 | return fwu_gpt_get_alt_num(dev_get_uclass_plat(priv->blk_dev), |
| 122 | image_guid, alt_num, DFU_DEV_MMC); |
| 123 | } |