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![Jonathan Gray](/assets/img/avatar_default.png)
Correct a mistake in the part number handling of commit
16a73b249d
and only increment part once
per loop.
Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
382 lines
10 KiB
C
382 lines
10 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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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 <inttypes.h>
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#include <part.h>
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#include <malloc.h>
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static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;
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struct efi_disk_obj {
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/* Generic EFI object parent class data */
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struct efi_object parent;
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/* EFI Interface callback struct for block I/O */
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struct efi_block_io ops;
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/* U-Boot ifname for block device */
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const char *ifname;
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/* U-Boot dev_index for block device */
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int dev_index;
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/* EFI Interface Media descriptor struct, referenced by ops */
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struct efi_block_io_media media;
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/* EFI device path to this block device */
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struct efi_device_path *dp;
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/* partition # */
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unsigned int part;
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/* handle to filesys proto (for partition objects) */
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struct efi_simple_file_system_protocol *volume;
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/* Offset into disk for simple partitions */
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lbaint_t offset;
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/* Internal block device */
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struct blk_desc *desc;
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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_DEVICE_ERROR);
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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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debug("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
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__LINE__, 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_DEVICE_ERROR;
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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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debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, 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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static efi_status_t EFIAPI efi_disk_read_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)
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{
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void *real_buffer = buffer;
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efi_status_t r;
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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, %"PRIx64", %lx, %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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static efi_status_t EFIAPI efi_disk_write_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)
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{
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void *real_buffer = buffer;
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efi_status_t r;
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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, %"PRIx64", %lx, %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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static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
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{
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/* We always write synchronously */
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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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* Find filesystem from a device-path. The passed in path 'p' probably
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* contains one or more /File(name) nodes, so the comparison stops at
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* the first /File() node, and returns the pointer to that via 'rp'.
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* This is mostly intended to be a helper to map a device-path to an
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* efi_file_handle object.
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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 *fp)
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{
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struct efi_object *efiobj;
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struct efi_disk_obj *diskobj;
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efiobj = efi_dp_find_obj(fp, NULL);
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if (!efiobj)
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return NULL;
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diskobj = container_of(efiobj, struct efi_disk_obj, parent);
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return diskobj->volume;
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}
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static void efi_disk_add_dev(const char *name,
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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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lbaint_t offset,
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unsigned int part)
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{
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struct efi_disk_obj *diskobj;
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/* Don't add empty devices */
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if (!desc->lba)
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return;
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diskobj = calloc(1, sizeof(*diskobj));
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/* Fill in object data */
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diskobj->dp = efi_dp_from_part(desc, part);
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diskobj->part = part;
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diskobj->parent.protocols[0].guid = &efi_block_io_guid;
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diskobj->parent.protocols[0].protocol_interface = &diskobj->ops;
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diskobj->parent.protocols[1].guid = &efi_guid_device_path;
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diskobj->parent.protocols[1].protocol_interface = diskobj->dp;
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if (part >= 1) {
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diskobj->volume = efi_simple_file_system(desc, part,
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diskobj->dp);
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diskobj->parent.protocols[2].guid =
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&efi_simple_file_system_protocol_guid;
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diskobj->parent.protocols[2].protocol_interface =
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diskobj->volume;
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}
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diskobj->parent.handle = diskobj;
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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->offset = offset;
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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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diskobj->media.block_size = desc->blksz;
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diskobj->media.io_align = desc->blksz;
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diskobj->media.last_block = desc->lba - offset;
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diskobj->ops.media = &diskobj->media;
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/* Hook up to the device list */
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list_add_tail(&diskobj->parent.link, &efi_obj_list);
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}
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static int efi_disk_create_eltorito(struct blk_desc *desc,
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const char *if_typename,
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int diskid,
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const char *pdevname)
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{
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int disks = 0;
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#if CONFIG_IS_ENABLED(ISO_PARTITION)
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char devname[32] = { 0 }; /* dp->str is u16[32] long */
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disk_partition_t info;
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int part;
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if (desc->part_type != PART_TYPE_ISO)
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return 0;
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/* and devices for each partition: */
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for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
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if (part_get_info(desc, part, &info))
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continue;
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snprintf(devname, sizeof(devname), "%s:%d", pdevname,
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part);
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efi_disk_add_dev(devname, if_typename, desc, diskid,
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info.start, part);
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disks++;
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}
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/* ... and add block device: */
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efi_disk_add_dev(devname, if_typename, desc, diskid, 0, 0);
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#endif
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return disks;
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}
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/*
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* U-Boot doesn't have a list of all online disk devices. So when running our
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* EFI payload, we scan through all of the potentially available ones and
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* store them in our object pool.
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*
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* TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
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* Consider converting the code to look up devices as needed. The EFI device
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* could be a child of the UCLASS_BLK block device, perhaps.
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*
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* This gets called from do_bootefi_exec().
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*/
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int efi_disk_register(void)
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{
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int disks = 0;
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#ifdef CONFIG_BLK
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struct udevice *dev;
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for (uclass_first_device_check(UCLASS_BLK, &dev);
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dev;
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uclass_next_device_check(&dev)) {
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struct blk_desc *desc = dev_get_uclass_platdata(dev);
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const char *if_typename = dev->driver->name;
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disk_partition_t info;
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int part;
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printf("Scanning disk %s...\n", dev->name);
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/* add devices for each partition: */
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for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
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if (part_get_info(desc, part, &info))
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continue;
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efi_disk_add_dev(dev->name, if_typename, desc,
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desc->devnum, 0, part);
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}
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/* ... and add block device: */
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efi_disk_add_dev(dev->name, if_typename, desc,
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desc->devnum, 0, 0);
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disks++;
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/*
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* El Torito images show up as block devices in an EFI world,
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* so let's create them here
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*/
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disks += efi_disk_create_eltorito(desc, if_typename,
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desc->devnum, dev->name);
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}
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#else
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int i, if_type;
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/* Search for all available disk devices */
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for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
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const struct blk_driver *cur_drvr;
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const char *if_typename;
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cur_drvr = blk_driver_lookup_type(if_type);
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if (!cur_drvr)
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continue;
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if_typename = cur_drvr->if_typename;
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printf("Scanning disks on %s...\n", if_typename);
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for (i = 0; i < 4; i++) {
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struct blk_desc *desc;
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char devname[32] = { 0 }; /* dp->str is u16[32] long */
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disk_partition_t info;
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int part;
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desc = blk_get_devnum_by_type(if_type, i);
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if (!desc)
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continue;
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if (desc->type == DEV_TYPE_UNKNOWN)
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continue;
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snprintf(devname, sizeof(devname), "%s%d",
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if_typename, i);
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/* add devices for each partition: */
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for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
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if (part_get_info(desc, part, &info))
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continue;
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efi_disk_add_dev(devname, if_typename, desc,
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i, 0, part);
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}
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/* ... and add block device: */
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efi_disk_add_dev(devname, if_typename, desc, i, 0, 0);
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disks++;
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/*
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* El Torito images show up as block devices
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* in an EFI world, so let's create them here
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*/
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disks += efi_disk_create_eltorito(desc, if_typename,
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i, devname);
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}
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}
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#endif
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printf("Found %d disks\n", disks);
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return 0;
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}
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