X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=lib%2Fefi_loader%2Fefi_disk.c;h=fd3df80b0b9627649cc47328cfcab91bad36a49d;hb=b641dd3ec8dc3f6b18d2fa945ac3ab597063d191;hp=af8db40e19ba112977e54690cec2e86bb5fd7d58;hpb=69fb6b1afcf37d3f68c6e0614658cfc023410e09;p=platform%2Fkernel%2Fu-boot.git diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c index af8db40..fd3df80 100644 --- a/lib/efi_loader/efi_disk.c +++ b/lib/efi_loader/efi_disk.c @@ -1,49 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * EFI application disk support * * Copyright (c) 2016 Alexander Graf - * - * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include -#include +#include #include #include -static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID; +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 { - /* Generic EFI object parent class data */ - struct efi_object parent; - /* EFI Interface callback struct for block I/O */ + struct efi_object header; struct efi_block_io ops; - /* U-Boot ifname for block device */ const char *ifname; - /* U-Boot dev_index for block device */ int dev_index; - /* EFI Interface Media descriptor struct, referenced by ops */ struct efi_block_io_media media; - /* EFI device path to this block device */ struct efi_device_path *dp; - /* partition # */ unsigned int part; - /* handle to filesys proto (for partition objects) */ struct efi_simple_file_system_protocol *volume; - /* Offset into disk for simple partitions */ lbaint_t offset; - /* Internal block device */ 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_DEVICE_ERROR); + return EFI_EXIT(EFI_SUCCESS); } enum efi_disk_direction { @@ -67,12 +87,12 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this, blocks = buffer_size / blksz; lba += diskobj->offset; - debug("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__, - __LINE__, blocks, lba, blksz, direction); + 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_DEVICE_ERROR; + return EFI_BAD_BUFFER_SIZE; if (direction == EFI_DISK_READ) n = blk_dread(desc, lba, blocks, buffer); @@ -82,7 +102,7 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this, /* We don't do interrupts, so check for timers cooperatively */ efi_timer_check(); - debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks); + EFI_PRINT("n=%lx blocks=%x\n", n, blocks); if (n != blocks) return EFI_DEVICE_ERROR; @@ -90,13 +110,42 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this, 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, unsigned long buffer_size, + 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, @@ -112,7 +161,7 @@ static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this, real_buffer = efi_bounce_buffer; #endif - EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba, + 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, @@ -125,13 +174,45 @@ static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this, 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, unsigned long buffer_size, + 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, @@ -147,7 +228,7 @@ static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this, real_buffer = efi_bounce_buffer; #endif - EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba, + EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba, buffer_size, buffer); /* Populate bounce buffer if necessary */ @@ -160,9 +241,22 @@ static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this, 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) { - /* We always write synchronously */ EFI_ENTRY("%p", this); return EFI_EXIT(EFI_SUCCESS); } @@ -174,79 +268,135 @@ static const struct efi_block_io block_io_disk_template = { .flush_blocks = &efi_disk_flush_blocks, }; -/* - * Find filesystem from a device-path. The passed in path 'p' probably - * contains one or more /File(name) nodes, so the comparison stops at - * the first /File() node, and returns the pointer to that via 'rp'. - * This is mostly intended to be a helper to map a device-path to an - * efi_file_handle object. +/** + * 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 *fp) +efi_fs_from_path(struct efi_device_path *full_path) { struct efi_object *efiobj; - struct efi_disk_obj *diskobj; + 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); - efiobj = efi_dp_find_obj(fp, NULL); + /* Get the EFI object for the partition */ + efiobj = efi_dp_find_obj(device_path, NULL); + efi_free_pool(device_path); if (!efiobj) return NULL; - diskobj = container_of(efiobj, struct efi_disk_obj, parent); + /* 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 diskobj->volume; + /* Return the simple file system protocol for the partition */ + return handler->protocol_interface; } -/* - * Create a device for a disk +/** + * 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 * - * @name not used - * @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 + * @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 void efi_disk_add_dev(const char *name, - const char *if_typename, - struct blk_desc *desc, - int dev_index, - lbaint_t offset, - unsigned int part) +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; efi_status_t ret; /* Don't add empty devices */ if (!desc->lba) - return; + return EFI_NOT_READY; diskobj = calloc(1, sizeof(*diskobj)); if (!diskobj) - goto out_of_memory; + return EFI_OUT_OF_RESOURCES; /* Hook up to the device list */ - INIT_LIST_HEAD(&diskobj->parent.protocols); - list_add_tail(&diskobj->parent.link, &efi_obj_list); + efi_add_handle(&diskobj->header); /* Fill in object data */ - diskobj->dp = efi_dp_from_part(desc, part); + if (part) { + struct efi_device_path *node = efi_dp_part_node(desc, part); + + 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; - diskobj->parent.handle = diskobj; - ret = efi_add_protocol(diskobj->parent.handle, &efi_block_io_guid, + ret = efi_add_protocol(&diskobj->header, &efi_block_io_guid, &diskobj->ops); if (ret != EFI_SUCCESS) - goto out_of_memory; - ret = efi_add_protocol(diskobj->parent.handle, &efi_guid_device_path, + return ret; + ret = efi_add_protocol(&diskobj->header, &efi_guid_device_path, diskobj->dp); if (ret != EFI_SUCCESS) - goto out_of_memory; - if (part >= 1) { + return ret; + /* partitions or whole disk without partitions */ + 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->parent.handle, + ret = efi_add_protocol(&diskobj->header, &efi_simple_file_system_protocol_guid, - &diskobj->volume); + diskobj->volume); if (ret != EFI_SUCCESS) - goto out_of_memory; + return ret; } diskobj->ops = block_io_disk_template; diskobj->ifname = if_typename; @@ -257,94 +407,134 @@ static void efi_disk_add_dev(const char *name, /* 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; - return; -out_of_memory: - printf("ERROR: Out of memory\n"); + if (disk) + *disk = diskobj; + + /* Store first EFI system partition */ + if (part && !efi_system_partition.if_type) { + int r; + disk_partition_t 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; } -static int efi_disk_create_eltorito(struct blk_desc *desc, - const char *if_typename, - int diskid, - const char *pdevname) +/** + * 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; -#if CONFIG_IS_ENABLED(ISO_PARTITION) char devname[32] = { 0 }; /* dp->str is u16[32] long */ disk_partition_t info; int part; + struct efi_device_path *dp = NULL; + efi_status_t ret; + struct efi_handler *handler; - if (desc->part_type != PART_TYPE_ISO) - return 0; + /* 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; - /* and devices for each partition: */ + /* 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); - efi_disk_add_dev(devname, if_typename, desc, diskid, - info.start, part); + ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid, + info.start, part, NULL); + if (ret != EFI_SUCCESS) { + printf("Adding partition %s failed\n", pdevname); + continue; + } disks++; } - /* ... and add block device: */ - efi_disk_add_dev(devname, if_typename, desc, diskid, 0, 0); -#endif - 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. * - * This gets called from do_bootefi_exec(). + * Return: status code */ -int efi_disk_register(void) +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; + for (uclass_first_device_check(UCLASS_BLK, &dev); dev; uclass_next_device_check(&dev)) { struct blk_desc *desc = dev_get_uclass_platdata(dev); - const char *if_typename = dev->driver->name; - disk_partition_t info; - int part; + const char *if_typename = blk_get_if_type_name(desc->if_type); + /* Add block device for the full device */ printf("Scanning disk %s...\n", dev->name); - - /* add devices for each partition: */ - for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) { - if (part_get_info(desc, part, &info)) - continue; - efi_disk_add_dev(dev->name, if_typename, desc, - desc->devnum, 0, part); + ret = efi_disk_add_dev(NULL, NULL, if_typename, + desc, desc->devnum, 0, 0, &disk); + if (ret == EFI_NOT_READY) { + printf("Disk %s not ready\n", dev->name); + continue; + } + if (ret) { + printf("ERROR: failure to add disk device %s, r = %lu\n", + dev->name, ret & ~EFI_ERROR_MASK); + return ret; } - - /* ... and add block device: */ - efi_disk_add_dev(dev->name, if_typename, desc, - desc->devnum, 0, 0); - disks++; - /* - * El Torito images show up as block devices in an EFI world, - * so let's create them here - */ - disks += efi_disk_create_eltorito(desc, if_typename, - desc->devnum, dev->name); + /* 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; @@ -363,8 +553,6 @@ int efi_disk_register(void) for (i = 0; i < 4; i++) { struct blk_desc *desc; char devname[32] = { 0 }; /* dp->str is u16[32] long */ - disk_partition_t info; - int part; desc = blk_get_devnum_by_type(if_type, i); if (!desc) @@ -375,28 +563,28 @@ int efi_disk_register(void) snprintf(devname, sizeof(devname), "%s%d", if_typename, i); - /* add devices for each partition: */ - for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) { - if (part_get_info(desc, part, &info)) - continue; - efi_disk_add_dev(devname, if_typename, desc, - i, 0, part); + /* 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) { + printf("Disk %s not ready\n", devname); + continue; + } + if (ret) { + printf("ERROR: failure to add disk device %s, r = %lu\n", + devname, ret & ~EFI_ERROR_MASK); + return ret; } - - /* ... and add block device: */ - efi_disk_add_dev(devname, if_typename, desc, i, 0, 0); disks++; - /* - * El Torito images show up as block devices - * in an EFI world, so let's create them here - */ - disks += efi_disk_create_eltorito(desc, if_typename, - i, devname); + /* Partitions show up as block devices in EFI */ + disks += efi_disk_create_partitions + (&disk->header, desc, + if_typename, i, devname); } } #endif printf("Found %d disks\n", disks); - return 0; + return EFI_SUCCESS; }