mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-13 14:53:06 +00:00
b78631d54f
The block IO protocol may be installed on any handle. We should make
no assumption about the structure the handle points to.
efi_disk_is_system_part() makes an illegal widening cast from a handle
to a struct efi_disk_obj. Remove the function.
Fixes: Fixes: 41fd506842
("efi_loader: disk: add efi_disk_is_system_part()")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
589 lines
16 KiB
C
589 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI application disk support
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*
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* Copyright (c) 2016 Alexander Graf
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*/
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#define LOG_CATEGORY LOGC_EFI
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#include <common.h>
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#include <blk.h>
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#include <dm.h>
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#include <efi_loader.h>
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#include <fs.h>
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#include <log.h>
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#include <part.h>
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#include <malloc.h>
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struct efi_system_partition efi_system_partition;
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const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
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const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_GUID;
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/**
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* struct efi_disk_obj - EFI disk object
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*
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* @header: EFI object header
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* @ops: EFI disk I/O protocol interface
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* @ifname: interface name for block device
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* @dev_index: device index of block device
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* @media: block I/O media information
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* @dp: device path to the block device
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* @part: partition
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* @volume: simple file system protocol of the partition
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* @offset: offset into disk for simple partition
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* @desc: internal block device descriptor
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*/
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struct efi_disk_obj {
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struct efi_object header;
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struct efi_block_io ops;
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const char *ifname;
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int dev_index;
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struct efi_block_io_media media;
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struct efi_device_path *dp;
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unsigned int part;
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struct efi_simple_file_system_protocol *volume;
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lbaint_t offset;
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struct blk_desc *desc;
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};
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/**
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* efi_disk_reset() - reset block device
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*
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* This function implements the Reset service of the EFI_BLOCK_IO_PROTOCOL.
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*
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* As U-Boot's block devices do not have a reset function simply return
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* EFI_SUCCESS.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @this: pointer to the BLOCK_IO_PROTOCOL
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* @extended_verification: extended verification
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* Return: status code
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*/
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static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
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char extended_verification)
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{
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EFI_ENTRY("%p, %x", this, extended_verification);
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return EFI_EXIT(EFI_SUCCESS);
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}
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enum efi_disk_direction {
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EFI_DISK_READ,
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EFI_DISK_WRITE,
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};
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static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
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u32 media_id, u64 lba, unsigned long buffer_size,
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void *buffer, enum efi_disk_direction direction)
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{
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struct efi_disk_obj *diskobj;
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struct blk_desc *desc;
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int blksz;
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int blocks;
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unsigned long n;
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diskobj = container_of(this, struct efi_disk_obj, ops);
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desc = (struct blk_desc *) diskobj->desc;
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blksz = desc->blksz;
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blocks = buffer_size / blksz;
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lba += diskobj->offset;
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EFI_PRINT("blocks=%x lba=%llx blksz=%x dir=%d\n",
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blocks, lba, blksz, direction);
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/* We only support full block access */
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if (buffer_size & (blksz - 1))
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return EFI_BAD_BUFFER_SIZE;
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if (direction == EFI_DISK_READ)
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n = blk_dread(desc, lba, blocks, buffer);
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else
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n = blk_dwrite(desc, lba, blocks, buffer);
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/* We don't do interrupts, so check for timers cooperatively */
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efi_timer_check();
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EFI_PRINT("n=%lx blocks=%x\n", n, blocks);
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if (n != blocks)
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return EFI_DEVICE_ERROR;
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return EFI_SUCCESS;
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}
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/**
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* efi_disk_read_blocks() - reads blocks from device
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*
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* This function implements the ReadBlocks service of the EFI_BLOCK_IO_PROTOCOL.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @this: pointer to the BLOCK_IO_PROTOCOL
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* @media_id: id of the medium to be read from
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* @lba: starting logical block for reading
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* @buffer_size: size of the read buffer
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* @buffer: pointer to the destination buffer
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* Return: status code
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*/
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static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
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u32 media_id, u64 lba, efi_uintn_t buffer_size,
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void *buffer)
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{
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void *real_buffer = buffer;
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efi_status_t r;
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if (!this)
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return EFI_INVALID_PARAMETER;
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/* TODO: check for media changes */
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if (media_id != this->media->media_id)
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return EFI_MEDIA_CHANGED;
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if (!this->media->media_present)
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return EFI_NO_MEDIA;
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/* media->io_align is a power of 2 or 0 */
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if (this->media->io_align &&
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(uintptr_t)buffer & (this->media->io_align - 1))
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return EFI_INVALID_PARAMETER;
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if (lba * this->media->block_size + buffer_size >
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(this->media->last_block + 1) * this->media->block_size)
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return EFI_INVALID_PARAMETER;
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#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
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if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
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r = efi_disk_read_blocks(this, media_id, lba,
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EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
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if (r != EFI_SUCCESS)
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return r;
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return efi_disk_read_blocks(this, media_id, lba +
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EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
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buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
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buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
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}
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real_buffer = efi_bounce_buffer;
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#endif
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EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
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buffer_size, buffer);
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r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
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EFI_DISK_READ);
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/* Copy from bounce buffer to real buffer if necessary */
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if ((r == EFI_SUCCESS) && (real_buffer != buffer))
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memcpy(buffer, real_buffer, buffer_size);
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return EFI_EXIT(r);
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}
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/**
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* efi_disk_write_blocks() - writes blocks to device
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*
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* This function implements the WriteBlocks service of the
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* EFI_BLOCK_IO_PROTOCOL.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @this: pointer to the BLOCK_IO_PROTOCOL
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* @media_id: id of the medium to be written to
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* @lba: starting logical block for writing
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* @buffer_size: size of the write buffer
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* @buffer: pointer to the source buffer
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* Return: status code
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*/
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static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
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u32 media_id, u64 lba, efi_uintn_t buffer_size,
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void *buffer)
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{
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void *real_buffer = buffer;
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efi_status_t r;
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if (!this)
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return EFI_INVALID_PARAMETER;
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if (this->media->read_only)
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return EFI_WRITE_PROTECTED;
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/* TODO: check for media changes */
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if (media_id != this->media->media_id)
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return EFI_MEDIA_CHANGED;
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if (!this->media->media_present)
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return EFI_NO_MEDIA;
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/* media->io_align is a power of 2 or 0 */
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if (this->media->io_align &&
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(uintptr_t)buffer & (this->media->io_align - 1))
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return EFI_INVALID_PARAMETER;
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if (lba * this->media->block_size + buffer_size >
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(this->media->last_block + 1) * this->media->block_size)
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return EFI_INVALID_PARAMETER;
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#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
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if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
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r = efi_disk_write_blocks(this, media_id, lba,
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EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
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if (r != EFI_SUCCESS)
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return r;
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return efi_disk_write_blocks(this, media_id, lba +
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EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
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buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
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buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
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}
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real_buffer = efi_bounce_buffer;
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#endif
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EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
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buffer_size, buffer);
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/* Populate bounce buffer if necessary */
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if (real_buffer != buffer)
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memcpy(real_buffer, buffer, buffer_size);
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r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
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EFI_DISK_WRITE);
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return EFI_EXIT(r);
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}
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/**
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* efi_disk_flush_blocks() - flushes modified data to the device
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*
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* This function implements the FlushBlocks service of the
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* EFI_BLOCK_IO_PROTOCOL.
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*
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* As we always write synchronously nothing is done here.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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*
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* @this: pointer to the BLOCK_IO_PROTOCOL
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* Return: status code
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*/
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static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
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{
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EFI_ENTRY("%p", this);
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return EFI_EXIT(EFI_SUCCESS);
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}
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static const struct efi_block_io block_io_disk_template = {
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.reset = &efi_disk_reset,
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.read_blocks = &efi_disk_read_blocks,
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.write_blocks = &efi_disk_write_blocks,
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.flush_blocks = &efi_disk_flush_blocks,
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};
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/**
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* efi_fs_from_path() - retrieve simple file system protocol
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*
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* Gets the simple file system protocol for a file device path.
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*
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* The full path provided is split into device part and into a file
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* part. The device part is used to find the handle on which the
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* simple file system protocol is installed.
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*
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* @full_path: device path including device and file
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* Return: simple file system protocol
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*/
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struct efi_simple_file_system_protocol *
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efi_fs_from_path(struct efi_device_path *full_path)
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{
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struct efi_object *efiobj;
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struct efi_handler *handler;
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struct efi_device_path *device_path;
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struct efi_device_path *file_path;
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efi_status_t ret;
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/* Split the path into a device part and a file part */
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ret = efi_dp_split_file_path(full_path, &device_path, &file_path);
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if (ret != EFI_SUCCESS)
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return NULL;
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efi_free_pool(file_path);
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/* Get the EFI object for the partition */
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efiobj = efi_dp_find_obj(device_path, NULL, NULL);
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efi_free_pool(device_path);
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if (!efiobj)
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return NULL;
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/* Find the simple file system protocol */
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ret = efi_search_protocol(efiobj, &efi_simple_file_system_protocol_guid,
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&handler);
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if (ret != EFI_SUCCESS)
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return NULL;
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/* Return the simple file system protocol for the partition */
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return handler->protocol_interface;
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}
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/**
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* efi_fs_exists() - check if a partition bears a file system
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*
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* @desc: block device descriptor
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* @part: partition number
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* Return: 1 if a file system exists on the partition
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* 0 otherwise
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*/
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static int efi_fs_exists(struct blk_desc *desc, int part)
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{
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if (fs_set_blk_dev_with_part(desc, part))
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return 0;
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if (fs_get_type() == FS_TYPE_ANY)
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return 0;
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fs_close();
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return 1;
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}
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/**
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* efi_disk_add_dev() - create a handle for a partition or disk
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*
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* @parent: parent handle
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* @dp_parent: parent device path
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* @if_typename: interface name for block device
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* @desc: internal block device
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* @dev_index: device index for block device
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* @part_info: partition info
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* @part: partition
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* @disk: pointer to receive the created handle
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* Return: disk object
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*/
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static efi_status_t efi_disk_add_dev(
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efi_handle_t parent,
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struct efi_device_path *dp_parent,
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const char *if_typename,
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struct blk_desc *desc,
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int dev_index,
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struct disk_partition *part_info,
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unsigned int part,
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struct efi_disk_obj **disk)
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{
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struct efi_disk_obj *diskobj;
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struct efi_object *handle;
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const efi_guid_t *guid = NULL;
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efi_status_t ret;
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/* Don't add empty devices */
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if (!desc->lba)
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return EFI_NOT_READY;
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diskobj = calloc(1, sizeof(*diskobj));
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if (!diskobj)
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return EFI_OUT_OF_RESOURCES;
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/* Hook up to the device list */
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efi_add_handle(&diskobj->header);
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/* Fill in object data */
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if (part_info) {
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struct efi_device_path *node = efi_dp_part_node(desc, part);
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struct efi_handler *handler;
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void *protocol_interface;
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/* Parent must expose EFI_BLOCK_IO_PROTOCOL */
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ret = efi_search_protocol(parent, &efi_block_io_guid, &handler);
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if (ret != EFI_SUCCESS)
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goto error;
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/*
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* Link the partition (child controller) to the block device
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* (controller).
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*/
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ret = efi_protocol_open(handler, &protocol_interface, NULL,
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&diskobj->header,
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EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER);
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if (ret != EFI_SUCCESS)
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goto error;
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diskobj->dp = efi_dp_append_node(dp_parent, node);
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efi_free_pool(node);
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diskobj->offset = part_info->start;
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diskobj->media.last_block = part_info->size - 1;
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if (part_info->bootable & PART_EFI_SYSTEM_PARTITION)
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guid = &efi_system_partition_guid;
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} else {
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diskobj->dp = efi_dp_from_part(desc, part);
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diskobj->offset = 0;
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diskobj->media.last_block = desc->lba - 1;
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}
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diskobj->part = part;
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/*
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* Install the device path and the block IO protocol.
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*
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* InstallMultipleProtocolInterfaces() checks if the device path is
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* already installed on an other handle and returns EFI_ALREADY_STARTED
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* in this case.
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*/
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handle = &diskobj->header;
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ret = EFI_CALL(efi_install_multiple_protocol_interfaces(
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&handle, &efi_guid_device_path, diskobj->dp,
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&efi_block_io_guid, &diskobj->ops,
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guid, NULL, NULL));
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if (ret != EFI_SUCCESS)
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goto error;
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/*
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* On partitions or whole disks without partitions install the
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* simple file system protocol if a file system is available.
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*/
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if ((part || desc->part_type == PART_TYPE_UNKNOWN) &&
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efi_fs_exists(desc, part)) {
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diskobj->volume = efi_simple_file_system(desc, part,
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diskobj->dp);
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ret = efi_add_protocol(&diskobj->header,
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&efi_simple_file_system_protocol_guid,
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diskobj->volume);
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if (ret != EFI_SUCCESS)
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return ret;
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}
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diskobj->ops = block_io_disk_template;
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diskobj->ifname = if_typename;
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diskobj->dev_index = dev_index;
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diskobj->desc = desc;
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/* Fill in EFI IO Media info (for read/write callbacks) */
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diskobj->media.removable_media = desc->removable;
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diskobj->media.media_present = 1;
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/*
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* MediaID is just an arbitrary counter.
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* We have to change it if the medium is removed or changed.
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*/
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diskobj->media.media_id = 1;
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diskobj->media.block_size = desc->blksz;
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diskobj->media.io_align = desc->blksz;
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if (part)
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diskobj->media.logical_partition = 1;
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diskobj->ops.media = &diskobj->media;
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if (disk)
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*disk = diskobj;
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EFI_PRINT("BlockIO: part %u, present %d, logical %d, removable %d"
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", offset " LBAF ", last_block %llu\n",
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diskobj->part,
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diskobj->media.media_present,
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diskobj->media.logical_partition,
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diskobj->media.removable_media,
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diskobj->offset,
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diskobj->media.last_block);
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/* Store first EFI system partition */
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if (part && !efi_system_partition.if_type) {
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if (part_info->bootable & PART_EFI_SYSTEM_PARTITION) {
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efi_system_partition.if_type = desc->if_type;
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efi_system_partition.devnum = desc->devnum;
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efi_system_partition.part = part;
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EFI_PRINT("EFI system partition: %s %x:%x\n",
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blk_get_if_type_name(desc->if_type),
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desc->devnum, part);
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}
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}
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return EFI_SUCCESS;
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error:
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efi_delete_handle(&diskobj->header);
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return ret;
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}
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|
|
|
/**
|
|
* 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 */
|
|
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++) {
|
|
struct disk_partition info;
|
|
|
|
if (part_get_info(desc, part, &info))
|
|
continue;
|
|
snprintf(devname, sizeof(devname), "%s:%x", pdevname,
|
|
part);
|
|
ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
|
|
&info, 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;
|
|
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, NULL, 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);
|
|
continue;
|
|
}
|
|
disks++;
|
|
|
|
/* Partitions show up as block devices in EFI */
|
|
disks += efi_disk_create_partitions(
|
|
&disk->header, desc, if_typename,
|
|
desc->devnum, dev->name);
|
|
}
|
|
|
|
log_info("Found %d disks\n", disks);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|