u-boot/lib/efi_loader/efi_disk.c
Heinrich Schuchardt b78631d54f efi_loader: remove efi_disk_is_system_part()
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>
2022-03-20 11:03:06 +01:00

589 lines
16 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* EFI application disk support
*
* Copyright (c) 2016 Alexander Graf
*/
#define LOG_CATEGORY LOGC_EFI
#include <common.h>
#include <blk.h>
#include <dm.h>
#include <efi_loader.h>
#include <fs.h>
#include <log.h>
#include <part.h>
#include <malloc.h>
struct efi_system_partition efi_system_partition;
const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_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 or 0 */
if (this->media->io_align &&
(uintptr_t)buffer & (this->media->io_align - 1))
return EFI_INVALID_PARAMETER;
if (lba * this->media->block_size + buffer_size >
(this->media->last_block + 1) * 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 or 0 */
if (this->media->io_align &&
(uintptr_t)buffer & (this->media->io_align - 1))
return EFI_INVALID_PARAMETER;
if (lba * this->media->block_size + buffer_size >
(this->media->last_block + 1) * 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, 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
* @part_info: partition info
* @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,
struct disk_partition *part_info,
unsigned int part,
struct efi_disk_obj **disk)
{
struct efi_disk_obj *diskobj;
struct efi_object *handle;
const efi_guid_t *guid = NULL;
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_info) {
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);
diskobj->offset = part_info->start;
diskobj->media.last_block = part_info->size - 1;
if (part_info->bootable & PART_EFI_SYSTEM_PARTITION)
guid = &efi_system_partition_guid;
} else {
diskobj->dp = efi_dp_from_part(desc, part);
diskobj->offset = 0;
diskobj->media.last_block = desc->lba - 1;
}
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,
guid, NULL, NULL));
if (ret != EFI_SUCCESS)
goto error;
/*
* 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->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;
if (part)
diskobj->media.logical_partition = 1;
diskobj->ops.media = &diskobj->media;
if (disk)
*disk = diskobj;
EFI_PRINT("BlockIO: part %u, present %d, logical %d, removable %d"
", offset " LBAF ", last_block %llu\n",
diskobj->part,
diskobj->media.media_present,
diskobj->media.logical_partition,
diskobj->media.removable_media,
diskobj->offset,
diskobj->media.last_block);
/* Store first EFI system partition */
if (part && !efi_system_partition.if_type) {
if (part_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 %x:%x\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 */
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;
}