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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | // SPDX-License-Identifier: GPL-2.0+ /* * Driver for sandbox host interface, used to access files on the host which * contain partitions and filesystem * * Copyright 2022 Google LLC * Written by Simon Glass <sjg@chromium.org> */ #define LOG_CATEGORY UCLASS_HOST #include <blk.h> #include <bootdev.h> #include <dm.h> #include <log.h> #include <malloc.h> #include <os.h> #include <sandbox_host.h> #include <dm/device-internal.h> static int host_sb_attach_file(struct udevice *dev, const char *filename) { struct host_sb_plat *plat = dev_get_plat(dev); struct blk_desc *desc; struct udevice *blk; int ret, fd; off_t size; char *fname; if (!filename) return -EINVAL; if (plat->fd) return log_msg_ret("fd", -EEXIST); /* Sanity check that host_sb_bind() has been used */ ret = blk_find_from_parent(dev, &blk); if (ret) return ret; fd = os_open(filename, OS_O_RDWR); if (fd < 0) { printf("Failed to access host backing file '%s', trying read-only\n", filename); fd = os_open(filename, OS_O_RDONLY); if (fd < 0) { printf("- still failed\n"); return log_msg_ret("open", -ENOENT); } } fname = strdup(filename); if (!fname) { ret = -ENOMEM; goto err_fname; } size = os_filesize(fd); desc = dev_get_uclass_plat(blk); if (size % desc->blksz) { printf("The size of host backing file '%s' is not multiple of " "the device block size\n", filename); ret = -EINVAL; goto err_fname; } desc->lba = size / desc->blksz; /* write this in last, when nothing can go wrong */ plat = dev_get_plat(dev); plat->fd = fd; plat->filename = fname; return 0; err_fname: os_close(fd); return ret; } static int host_sb_detach_file(struct udevice *dev) { struct host_sb_plat *plat = dev_get_plat(dev); int ret; if (!plat->fd) return log_msg_ret("fd", -ENOENT); ret = device_remove(dev, DM_REMOVE_NORMAL); if (ret) return log_msg_ret("rem", ret); /* Unbind all children */ ret = device_chld_unbind(dev, NULL); if (ret) return log_msg_ret("unb", ret); os_close(plat->fd); plat->fd = 0; free(plat->filename); free(plat->label); return 0; } static int host_sb_bind(struct udevice *dev) { struct udevice *blk, *bdev; struct blk_desc *desc; int ret; ret = blk_create_devicef(dev, "sandbox_host_blk", "blk", UCLASS_HOST, dev_seq(dev), DEFAULT_BLKSZ, 0, &blk); if (ret) return log_msg_ret("blk", ret); desc = dev_get_uclass_plat(blk); snprintf(desc->vendor, BLK_VEN_SIZE, "U-Boot"); snprintf(desc->product, BLK_PRD_SIZE, "hostfile"); snprintf(desc->revision, BLK_REV_SIZE, "1.0"); if (CONFIG_IS_ENABLED(BOOTSTD)) { ret = bootdev_bind(dev, "host_bootdev", "bootdev", &bdev); if (ret) return log_msg_ret("bd", ret); } return 0; } static struct host_ops host_sb_ops = { .attach_file = host_sb_attach_file, .detach_file = host_sb_detach_file, }; static const struct udevice_id host_ids[] = { { .compatible = "sandbox,host" }, { } }; U_BOOT_DRIVER(host_sb_drv) = { .name = "host_sb_drv", .id = UCLASS_HOST, .of_match = host_ids, .ops = &host_sb_ops, .bind = host_sb_bind, .plat_auto = sizeof(struct host_sb_plat), }; |