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