// SPDX-License-Identifier: GPL-2.0+ /* * EFI application disk support * * Copyright (c) 2016 Alexander Graf */ #define LOG_CATEGORY LOGC_EFI #include #include #include #include #include #include #include #include struct efi_system_partition efi_system_partition; const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID; /** * struct efi_disk_obj - EFI disk object * * @header: EFI object header * @ops: EFI disk I/O protocol interface * @ifname: interface name for block device * @dev_index: device index of block device * @media: block I/O media information * @dp: device path to the block device * @part: partition * @volume: simple file system protocol of the partition * @offset: offset into disk for simple partition * @desc: internal block device descriptor */ struct efi_disk_obj { struct efi_object header; struct efi_block_io ops; const char *ifname; int dev_index; struct efi_block_io_media media; struct efi_device_path *dp; unsigned int part; struct efi_simple_file_system_protocol *volume; lbaint_t offset; struct blk_desc *desc; }; /** * efi_disk_reset() - reset block device * * This function implements the Reset service of the EFI_BLOCK_IO_PROTOCOL. * * As U-Boot's block devices do not have a reset function simply return * EFI_SUCCESS. * * See the Unified Extensible Firmware Interface (UEFI) specification for * details. * * @this: pointer to the BLOCK_IO_PROTOCOL * @extended_verification: extended verification * Return: status code */ static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this, char extended_verification) { EFI_ENTRY("%p, %x", this, extended_verification); return EFI_EXIT(EFI_SUCCESS); } enum efi_disk_direction { EFI_DISK_READ, EFI_DISK_WRITE, }; static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this, u32 media_id, u64 lba, unsigned long buffer_size, void *buffer, enum efi_disk_direction direction) { struct efi_disk_obj *diskobj; struct blk_desc *desc; int blksz; int blocks; unsigned long n; diskobj = container_of(this, struct efi_disk_obj, ops); desc = (struct blk_desc *) diskobj->desc; blksz = desc->blksz; blocks = buffer_size / blksz; lba += diskobj->offset; EFI_PRINT("blocks=%x lba=%llx blksz=%x dir=%d\n", blocks, lba, blksz, direction); /* We only support full block access */ if (buffer_size & (blksz - 1)) return EFI_BAD_BUFFER_SIZE; if (direction == EFI_DISK_READ) n = blk_dread(desc, lba, blocks, buffer); else n = blk_dwrite(desc, lba, blocks, buffer); /* We don't do interrupts, so check for timers cooperatively */ efi_timer_check(); EFI_PRINT("n=%lx blocks=%x\n", n, blocks); if (n != blocks) return EFI_DEVICE_ERROR; return EFI_SUCCESS; } /** * efi_disk_read_blocks() - reads blocks from device * * This function implements the ReadBlocks service of the EFI_BLOCK_IO_PROTOCOL. * * See the Unified Extensible Firmware Interface (UEFI) specification for * details. * * @this: pointer to the BLOCK_IO_PROTOCOL * @media_id: id of the medium to be read from * @lba: starting logical block for reading * @buffer_size: size of the read buffer * @buffer: pointer to the destination buffer * Return: status code */ static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this, u32 media_id, u64 lba, efi_uintn_t buffer_size, void *buffer) { void *real_buffer = buffer; efi_status_t r; if (!this) return EFI_INVALID_PARAMETER; /* TODO: check for media changes */ if (media_id != this->media->media_id) return EFI_MEDIA_CHANGED; if (!this->media->media_present) return EFI_NO_MEDIA; /* media->io_align is a power of 2 */ if ((uintptr_t)buffer & (this->media->io_align - 1)) return EFI_INVALID_PARAMETER; if (lba * this->media->block_size + buffer_size > this->media->last_block * this->media->block_size) return EFI_INVALID_PARAMETER; #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) { r = efi_disk_read_blocks(this, media_id, lba, EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer); if (r != EFI_SUCCESS) return r; return efi_disk_read_blocks(this, media_id, lba + EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size, buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE); } real_buffer = efi_bounce_buffer; #endif EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba, buffer_size, buffer); r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer, EFI_DISK_READ); /* Copy from bounce buffer to real buffer if necessary */ if ((r == EFI_SUCCESS) && (real_buffer != buffer)) memcpy(buffer, real_buffer, buffer_size); return EFI_EXIT(r); } /** * efi_disk_write_blocks() - writes blocks to device * * This function implements the WriteBlocks service of the * EFI_BLOCK_IO_PROTOCOL. * * See the Unified Extensible Firmware Interface (UEFI) specification for * details. * * @this: pointer to the BLOCK_IO_PROTOCOL * @media_id: id of the medium to be written to * @lba: starting logical block for writing * @buffer_size: size of the write buffer * @buffer: pointer to the source buffer * Return: status code */ static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this, u32 media_id, u64 lba, efi_uintn_t buffer_size, void *buffer) { void *real_buffer = buffer; efi_status_t r; if (!this) return EFI_INVALID_PARAMETER; if (this->media->read_only) return EFI_WRITE_PROTECTED; /* TODO: check for media changes */ if (media_id != this->media->media_id) return EFI_MEDIA_CHANGED; if (!this->media->media_present) return EFI_NO_MEDIA; /* media->io_align is a power of 2 */ if ((uintptr_t)buffer & (this->media->io_align - 1)) return EFI_INVALID_PARAMETER; if (lba * this->media->block_size + buffer_size > this->media->last_block * this->media->block_size) return EFI_INVALID_PARAMETER; #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) { r = efi_disk_write_blocks(this, media_id, lba, EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer); if (r != EFI_SUCCESS) return r; return efi_disk_write_blocks(this, media_id, lba + EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size, buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE); } real_buffer = efi_bounce_buffer; #endif EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba, buffer_size, buffer); /* Populate bounce buffer if necessary */ if (real_buffer != buffer) memcpy(real_buffer, buffer, buffer_size); r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer, EFI_DISK_WRITE); return EFI_EXIT(r); } /** * efi_disk_flush_blocks() - flushes modified data to the device * * This function implements the FlushBlocks service of the * EFI_BLOCK_IO_PROTOCOL. * * As we always write synchronously nothing is done here. * * See the Unified Extensible Firmware Interface (UEFI) specification for * details. * * @this: pointer to the BLOCK_IO_PROTOCOL * Return: status code */ static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this) { EFI_ENTRY("%p", this); return EFI_EXIT(EFI_SUCCESS); } static const struct efi_block_io block_io_disk_template = { .reset = &efi_disk_reset, .read_blocks = &efi_disk_read_blocks, .write_blocks = &efi_disk_write_blocks, .flush_blocks = &efi_disk_flush_blocks, }; /** * efi_fs_from_path() - retrieve simple file system protocol * * Gets the simple file system protocol for a file device path. * * The full path provided is split into device part and into a file * part. The device part is used to find the handle on which the * simple file system protocol is installed. * * @full_path: device path including device and file * Return: simple file system protocol */ struct efi_simple_file_system_protocol * efi_fs_from_path(struct efi_device_path *full_path) { struct efi_object *efiobj; struct efi_handler *handler; struct efi_device_path *device_path; struct efi_device_path *file_path; efi_status_t ret; /* Split the path into a device part and a file part */ ret = efi_dp_split_file_path(full_path, &device_path, &file_path); if (ret != EFI_SUCCESS) return NULL; efi_free_pool(file_path); /* Get the EFI object for the partition */ efiobj = efi_dp_find_obj(device_path, NULL); efi_free_pool(device_path); if (!efiobj) return NULL; /* Find the simple file system protocol */ ret = efi_search_protocol(efiobj, &efi_simple_file_system_protocol_guid, &handler); if (ret != EFI_SUCCESS) return NULL; /* Return the simple file system protocol for the partition */ return handler->protocol_interface; } /** * efi_fs_exists() - check if a partition bears a file system * * @desc: block device descriptor * @part: partition number * Return: 1 if a file system exists on the partition * 0 otherwise */ static int efi_fs_exists(struct blk_desc *desc, int part) { if (fs_set_blk_dev_with_part(desc, part)) return 0; if (fs_get_type() == FS_TYPE_ANY) return 0; fs_close(); return 1; } /** * efi_disk_add_dev() - create a handle for a partition or disk * * @parent: parent handle * @dp_parent: parent device path * @if_typename: interface name for block device * @desc: internal block device * @dev_index: device index for block device * @offset: offset into disk for simple partitions * @part: partition * @disk: pointer to receive the created handle * Return: disk object */ static efi_status_t efi_disk_add_dev( efi_handle_t parent, struct efi_device_path *dp_parent, const char *if_typename, struct blk_desc *desc, int dev_index, lbaint_t offset, unsigned int part, struct efi_disk_obj **disk) { struct efi_disk_obj *diskobj; struct efi_object *handle; efi_status_t ret; /* Don't add empty devices */ if (!desc->lba) return EFI_NOT_READY; diskobj = calloc(1, sizeof(*diskobj)); if (!diskobj) return EFI_OUT_OF_RESOURCES; /* Hook up to the device list */ efi_add_handle(&diskobj->header); /* Fill in object data */ if (part) { struct efi_device_path *node = efi_dp_part_node(desc, part); struct efi_handler *handler; void *protocol_interface; /* Parent must expose EFI_BLOCK_IO_PROTOCOL */ ret = efi_search_protocol(parent, &efi_block_io_guid, &handler); if (ret != EFI_SUCCESS) goto error; /* * Link the partition (child controller) to the block device * (controller). */ ret = efi_protocol_open(handler, &protocol_interface, NULL, &diskobj->header, EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER); if (ret != EFI_SUCCESS) goto error; diskobj->dp = efi_dp_append_node(dp_parent, node); efi_free_pool(node); } else { diskobj->dp = efi_dp_from_part(desc, part); } diskobj->part = part; /* * Install the device path and the block IO protocol. * * InstallMultipleProtocolInterfaces() checks if the device path is * already installed on an other handle and returns EFI_ALREADY_STARTED * in this case. */ handle = &diskobj->header; ret = EFI_CALL(efi_install_multiple_protocol_interfaces( &handle, &efi_guid_device_path, diskobj->dp, &efi_block_io_guid, &diskobj->ops, NULL)); if (ret != EFI_SUCCESS) return ret; /* * On partitions or whole disks without partitions install the * simple file system protocol if a file system is available. */ if ((part || desc->part_type == PART_TYPE_UNKNOWN) && efi_fs_exists(desc, part)) { diskobj->volume = efi_simple_file_system(desc, part, diskobj->dp); ret = efi_add_protocol(&diskobj->header, &efi_simple_file_system_protocol_guid, diskobj->volume); if (ret != EFI_SUCCESS) return ret; } diskobj->ops = block_io_disk_template; diskobj->ifname = if_typename; diskobj->dev_index = dev_index; diskobj->offset = offset; diskobj->desc = desc; /* Fill in EFI IO Media info (for read/write callbacks) */ diskobj->media.removable_media = desc->removable; diskobj->media.media_present = 1; /* * MediaID is just an arbitrary counter. * We have to change it if the medium is removed or changed. */ diskobj->media.media_id = 1; diskobj->media.block_size = desc->blksz; diskobj->media.io_align = desc->blksz; diskobj->media.last_block = desc->lba - offset; if (part) diskobj->media.logical_partition = 1; diskobj->ops.media = &diskobj->media; if (disk) *disk = diskobj; /* Store first EFI system partition */ if (part && !efi_system_partition.if_type) { int r; struct disk_partition info; r = part_get_info(desc, part, &info); if (r) return EFI_DEVICE_ERROR; if (info.bootable & PART_EFI_SYSTEM_PARTITION) { efi_system_partition.if_type = desc->if_type; efi_system_partition.devnum = desc->devnum; efi_system_partition.part = part; EFI_PRINT("EFI system partition: %s %d:%d\n", blk_get_if_type_name(desc->if_type), desc->devnum, part); } } return EFI_SUCCESS; error: efi_delete_handle(&diskobj->header); return ret; } /** * efi_disk_create_partitions() - create handles and protocols for partitions * * Create handles and protocols for the partitions of a block device. * * @parent: handle of the parent disk * @desc: block device * @if_typename: interface type * @diskid: device number * @pdevname: device name * Return: number of partitions created */ int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc, const char *if_typename, int diskid, const char *pdevname) { int disks = 0; char devname[32] = { 0 }; /* dp->str is u16[32] long */ struct disk_partition info; int part; struct efi_device_path *dp = NULL; efi_status_t ret; struct efi_handler *handler; /* Get the device path of the parent */ ret = efi_search_protocol(parent, &efi_guid_device_path, &handler); if (ret == EFI_SUCCESS) dp = handler->protocol_interface; /* Add devices for each partition */ for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) { if (part_get_info(desc, part, &info)) continue; snprintf(devname, sizeof(devname), "%s:%d", pdevname, part); ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid, info.start, part, NULL); if (ret != EFI_SUCCESS) { log_err("Adding partition %s failed\n", pdevname); continue; } disks++; } return disks; } /** * efi_disk_register() - register block devices * * U-Boot doesn't have a list of all online disk devices. So when running our * EFI payload, we scan through all of the potentially available ones and * store them in our object pool. * * This function is called in efi_init_obj_list(). * * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this. * Consider converting the code to look up devices as needed. The EFI device * could be a child of the UCLASS_BLK block device, perhaps. * * Return: status code */ efi_status_t efi_disk_register(void) { struct efi_disk_obj *disk; int disks = 0; efi_status_t ret; #ifdef CONFIG_BLK struct udevice *dev; for (uclass_first_device_check(UCLASS_BLK, &dev); dev; uclass_next_device_check(&dev)) { struct blk_desc *desc = dev_get_uclass_plat(dev); const char *if_typename = blk_get_if_type_name(desc->if_type); /* Add block device for the full device */ log_info("Scanning disk %s...\n", dev->name); ret = efi_disk_add_dev(NULL, NULL, if_typename, desc, desc->devnum, 0, 0, &disk); if (ret == EFI_NOT_READY) { log_notice("Disk %s not ready\n", dev->name); continue; } if (ret) { log_err("ERROR: failure to add disk device %s, r = %lu\n", dev->name, ret & ~EFI_ERROR_MASK); return ret; } disks++; /* Partitions show up as block devices in EFI */ disks += efi_disk_create_partitions( &disk->header, desc, if_typename, desc->devnum, dev->name); } #else int i, if_type; /* Search for all available disk devices */ for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) { const struct blk_driver *cur_drvr; const char *if_typename; cur_drvr = blk_driver_lookup_type(if_type); if (!cur_drvr) continue; if_typename = cur_drvr->if_typename; log_info("Scanning disks on %s...\n", if_typename); for (i = 0; i < 4; i++) { struct blk_desc *desc; char devname[32] = { 0 }; /* dp->str is u16[32] long */ desc = blk_get_devnum_by_type(if_type, i); if (!desc) continue; if (desc->type == DEV_TYPE_UNKNOWN) continue; snprintf(devname, sizeof(devname), "%s%d", if_typename, i); /* Add block device for the full device */ ret = efi_disk_add_dev(NULL, NULL, if_typename, desc, i, 0, 0, &disk); if (ret == EFI_NOT_READY) { log_notice("Disk %s not ready\n", devname); continue; } if (ret) { log_err("ERROR: failure to add disk device %s, r = %lu\n", devname, ret & ~EFI_ERROR_MASK); return ret; } disks++; /* Partitions show up as block devices in EFI */ disks += efi_disk_create_partitions (&disk->header, desc, if_typename, i, devname); } } #endif log_info("Found %d disks\n", disks); return EFI_SUCCESS; } /** * efi_disk_is_system_part() - check if handle refers to an EFI system partition * * @handle: handle of partition * * Return: true if handle refers to an EFI system partition */ bool efi_disk_is_system_part(efi_handle_t handle) { struct efi_handler *handler; struct efi_disk_obj *diskobj; struct disk_partition info; efi_status_t ret; int r; /* check if this is a block device */ ret = efi_search_protocol(handle, &efi_block_io_guid, &handler); if (ret != EFI_SUCCESS) return false; diskobj = container_of(handle, struct efi_disk_obj, header); r = part_get_info(diskobj->desc, diskobj->part, &info); if (r) return false; return !!(info.bootable & PART_EFI_SYSTEM_PARTITION); }