1 // SPDX-License-Identifier: GPL-2.0+
3 * EFI application disk support
5 * Copyright (c) 2016 Alexander Graf
11 #include <efi_loader.h>
16 struct efi_system_partition efi_system_partition
;
18 const efi_guid_t efi_block_io_guid
= EFI_BLOCK_IO_PROTOCOL_GUID
;
21 * struct efi_disk_obj - EFI disk object
23 * @header: EFI object header
24 * @ops: EFI disk I/O protocol interface
25 * @ifname: interface name for block device
26 * @dev_index: device index of block device
27 * @media: block I/O media information
28 * @dp: device path to the block device
30 * @volume: simple file system protocol of the partition
31 * @offset: offset into disk for simple partition
32 * @desc: internal block device descriptor
35 struct efi_object header
;
36 struct efi_block_io ops
;
39 struct efi_block_io_media media
;
40 struct efi_device_path
*dp
;
42 struct efi_simple_file_system_protocol
*volume
;
44 struct blk_desc
*desc
;
48 * efi_disk_reset() - reset block device
50 * This function implements the Reset service of the EFI_BLOCK_IO_PROTOCOL.
52 * As U-Boot's block devices do not have a reset function simply return
55 * See the Unified Extensible Firmware Interface (UEFI) specification for
58 * @this: pointer to the BLOCK_IO_PROTOCOL
59 * @extended_verification: extended verification
62 static efi_status_t EFIAPI
efi_disk_reset(struct efi_block_io
*this,
63 char extended_verification
)
65 EFI_ENTRY("%p, %x", this, extended_verification
);
66 return EFI_EXIT(EFI_SUCCESS
);
69 enum efi_disk_direction
{
74 static efi_status_t
efi_disk_rw_blocks(struct efi_block_io
*this,
75 u32 media_id
, u64 lba
, unsigned long buffer_size
,
76 void *buffer
, enum efi_disk_direction direction
)
78 struct efi_disk_obj
*diskobj
;
79 struct blk_desc
*desc
;
84 diskobj
= container_of(this, struct efi_disk_obj
, ops
);
85 desc
= (struct blk_desc
*) diskobj
->desc
;
87 blocks
= buffer_size
/ blksz
;
88 lba
+= diskobj
->offset
;
90 EFI_PRINT("blocks=%x lba=%llx blksz=%x dir=%d\n",
91 blocks
, lba
, blksz
, direction
);
93 /* We only support full block access */
94 if (buffer_size
& (blksz
- 1))
95 return EFI_BAD_BUFFER_SIZE
;
97 if (direction
== EFI_DISK_READ
)
98 n
= blk_dread(desc
, lba
, blocks
, buffer
);
100 n
= blk_dwrite(desc
, lba
, blocks
, buffer
);
102 /* We don't do interrupts, so check for timers cooperatively */
105 EFI_PRINT("n=%lx blocks=%x\n", n
, blocks
);
108 return EFI_DEVICE_ERROR
;
114 * efi_disk_read_blocks() - reads blocks from device
116 * This function implements the ReadBlocks service of the EFI_BLOCK_IO_PROTOCOL.
118 * See the Unified Extensible Firmware Interface (UEFI) specification for
121 * @this: pointer to the BLOCK_IO_PROTOCOL
122 * @media_id: id of the medium to be read from
123 * @lba: starting logical block for reading
124 * @buffer_size: size of the read buffer
125 * @buffer: pointer to the destination buffer
126 * Return: status code
128 static efi_status_t EFIAPI
efi_disk_read_blocks(struct efi_block_io
*this,
129 u32 media_id
, u64 lba
, efi_uintn_t buffer_size
,
132 void *real_buffer
= buffer
;
136 return EFI_INVALID_PARAMETER
;
137 /* TODO: check for media changes */
138 if (media_id
!= this->media
->media_id
)
139 return EFI_MEDIA_CHANGED
;
140 if (!this->media
->media_present
)
142 /* media->io_align is a power of 2 */
143 if ((uintptr_t)buffer
& (this->media
->io_align
- 1))
144 return EFI_INVALID_PARAMETER
;
145 if (lba
* this->media
->block_size
+ buffer_size
>
146 this->media
->last_block
* this->media
->block_size
)
147 return EFI_INVALID_PARAMETER
;
149 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
150 if (buffer_size
> EFI_LOADER_BOUNCE_BUFFER_SIZE
) {
151 r
= efi_disk_read_blocks(this, media_id
, lba
,
152 EFI_LOADER_BOUNCE_BUFFER_SIZE
, buffer
);
153 if (r
!= EFI_SUCCESS
)
155 return efi_disk_read_blocks(this, media_id
, lba
+
156 EFI_LOADER_BOUNCE_BUFFER_SIZE
/ this->media
->block_size
,
157 buffer_size
- EFI_LOADER_BOUNCE_BUFFER_SIZE
,
158 buffer
+ EFI_LOADER_BOUNCE_BUFFER_SIZE
);
161 real_buffer
= efi_bounce_buffer
;
164 EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id
, lba
,
165 buffer_size
, buffer
);
167 r
= efi_disk_rw_blocks(this, media_id
, lba
, buffer_size
, real_buffer
,
170 /* Copy from bounce buffer to real buffer if necessary */
171 if ((r
== EFI_SUCCESS
) && (real_buffer
!= buffer
))
172 memcpy(buffer
, real_buffer
, buffer_size
);
178 * efi_disk_write_blocks() - writes blocks to device
180 * This function implements the WriteBlocks service of the
181 * EFI_BLOCK_IO_PROTOCOL.
183 * See the Unified Extensible Firmware Interface (UEFI) specification for
186 * @this: pointer to the BLOCK_IO_PROTOCOL
187 * @media_id: id of the medium to be written to
188 * @lba: starting logical block for writing
189 * @buffer_size: size of the write buffer
190 * @buffer: pointer to the source buffer
191 * Return: status code
193 static efi_status_t EFIAPI
efi_disk_write_blocks(struct efi_block_io
*this,
194 u32 media_id
, u64 lba
, efi_uintn_t buffer_size
,
197 void *real_buffer
= buffer
;
201 return EFI_INVALID_PARAMETER
;
202 if (this->media
->read_only
)
203 return EFI_WRITE_PROTECTED
;
204 /* TODO: check for media changes */
205 if (media_id
!= this->media
->media_id
)
206 return EFI_MEDIA_CHANGED
;
207 if (!this->media
->media_present
)
209 /* media->io_align is a power of 2 */
210 if ((uintptr_t)buffer
& (this->media
->io_align
- 1))
211 return EFI_INVALID_PARAMETER
;
212 if (lba
* this->media
->block_size
+ buffer_size
>
213 this->media
->last_block
* this->media
->block_size
)
214 return EFI_INVALID_PARAMETER
;
216 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
217 if (buffer_size
> EFI_LOADER_BOUNCE_BUFFER_SIZE
) {
218 r
= efi_disk_write_blocks(this, media_id
, lba
,
219 EFI_LOADER_BOUNCE_BUFFER_SIZE
, buffer
);
220 if (r
!= EFI_SUCCESS
)
222 return efi_disk_write_blocks(this, media_id
, lba
+
223 EFI_LOADER_BOUNCE_BUFFER_SIZE
/ this->media
->block_size
,
224 buffer_size
- EFI_LOADER_BOUNCE_BUFFER_SIZE
,
225 buffer
+ EFI_LOADER_BOUNCE_BUFFER_SIZE
);
228 real_buffer
= efi_bounce_buffer
;
231 EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id
, lba
,
232 buffer_size
, buffer
);
234 /* Populate bounce buffer if necessary */
235 if (real_buffer
!= buffer
)
236 memcpy(real_buffer
, buffer
, buffer_size
);
238 r
= efi_disk_rw_blocks(this, media_id
, lba
, buffer_size
, real_buffer
,
245 * efi_disk_flush_blocks() - flushes modified data to the device
247 * This function implements the FlushBlocks service of the
248 * EFI_BLOCK_IO_PROTOCOL.
250 * As we always write synchronously nothing is done here.
252 * See the Unified Extensible Firmware Interface (UEFI) specification for
255 * @this: pointer to the BLOCK_IO_PROTOCOL
256 * Return: status code
258 static efi_status_t EFIAPI
efi_disk_flush_blocks(struct efi_block_io
*this)
260 EFI_ENTRY("%p", this);
261 return EFI_EXIT(EFI_SUCCESS
);
264 static const struct efi_block_io block_io_disk_template
= {
265 .reset
= &efi_disk_reset
,
266 .read_blocks
= &efi_disk_read_blocks
,
267 .write_blocks
= &efi_disk_write_blocks
,
268 .flush_blocks
= &efi_disk_flush_blocks
,
272 * efi_fs_from_path() - retrieve simple file system protocol
274 * Gets the simple file system protocol for a file device path.
276 * The full path provided is split into device part and into a file
277 * part. The device part is used to find the handle on which the
278 * simple file system protocol is installed.
280 * @full_path: device path including device and file
281 * Return: simple file system protocol
283 struct efi_simple_file_system_protocol
*
284 efi_fs_from_path(struct efi_device_path
*full_path
)
286 struct efi_object
*efiobj
;
287 struct efi_handler
*handler
;
288 struct efi_device_path
*device_path
;
289 struct efi_device_path
*file_path
;
292 /* Split the path into a device part and a file part */
293 ret
= efi_dp_split_file_path(full_path
, &device_path
, &file_path
);
294 if (ret
!= EFI_SUCCESS
)
296 efi_free_pool(file_path
);
298 /* Get the EFI object for the partition */
299 efiobj
= efi_dp_find_obj(device_path
, NULL
);
300 efi_free_pool(device_path
);
304 /* Find the simple file system protocol */
305 ret
= efi_search_protocol(efiobj
, &efi_simple_file_system_protocol_guid
,
307 if (ret
!= EFI_SUCCESS
)
310 /* Return the simple file system protocol for the partition */
311 return handler
->protocol_interface
;
315 * efi_fs_exists() - check if a partition bears a file system
317 * @desc: block device descriptor
318 * @part: partition number
319 * Return: 1 if a file system exists on the partition
322 static int efi_fs_exists(struct blk_desc
*desc
, int part
)
324 if (fs_set_blk_dev_with_part(desc
, part
))
327 if (fs_get_type() == FS_TYPE_ANY
)
336 * efi_disk_add_dev() - create a handle for a partition or disk
338 * @parent: parent handle
339 * @dp_parent: parent device path
340 * @if_typename: interface name for block device
341 * @desc: internal block device
342 * @dev_index: device index for block device
343 * @offset: offset into disk for simple partitions
345 * @disk: pointer to receive the created handle
346 * Return: disk object
348 static efi_status_t
efi_disk_add_dev(
350 struct efi_device_path
*dp_parent
,
351 const char *if_typename
,
352 struct blk_desc
*desc
,
356 struct efi_disk_obj
**disk
)
358 struct efi_disk_obj
*diskobj
;
361 /* Don't add empty devices */
363 return EFI_NOT_READY
;
365 diskobj
= calloc(1, sizeof(*diskobj
));
367 return EFI_OUT_OF_RESOURCES
;
369 /* Hook up to the device list */
370 efi_add_handle(&diskobj
->header
);
372 /* Fill in object data */
374 struct efi_device_path
*node
= efi_dp_part_node(desc
, part
);
376 diskobj
->dp
= efi_dp_append_node(dp_parent
, node
);
379 diskobj
->dp
= efi_dp_from_part(desc
, part
);
381 diskobj
->part
= part
;
382 ret
= efi_add_protocol(&diskobj
->header
, &efi_block_io_guid
,
384 if (ret
!= EFI_SUCCESS
)
386 ret
= efi_add_protocol(&diskobj
->header
, &efi_guid_device_path
,
388 if (ret
!= EFI_SUCCESS
)
390 /* partitions or whole disk without partitions */
391 if ((part
|| desc
->part_type
== PART_TYPE_UNKNOWN
) &&
392 efi_fs_exists(desc
, part
)) {
393 diskobj
->volume
= efi_simple_file_system(desc
, part
,
395 ret
= efi_add_protocol(&diskobj
->header
,
396 &efi_simple_file_system_protocol_guid
,
398 if (ret
!= EFI_SUCCESS
)
401 diskobj
->ops
= block_io_disk_template
;
402 diskobj
->ifname
= if_typename
;
403 diskobj
->dev_index
= dev_index
;
404 diskobj
->offset
= offset
;
405 diskobj
->desc
= desc
;
407 /* Fill in EFI IO Media info (for read/write callbacks) */
408 diskobj
->media
.removable_media
= desc
->removable
;
409 diskobj
->media
.media_present
= 1;
411 * MediaID is just an arbitrary counter.
412 * We have to change it if the medium is removed or changed.
414 diskobj
->media
.media_id
= 1;
415 diskobj
->media
.block_size
= desc
->blksz
;
416 diskobj
->media
.io_align
= desc
->blksz
;
417 diskobj
->media
.last_block
= desc
->lba
- offset
;
419 diskobj
->media
.logical_partition
= 1;
420 diskobj
->ops
.media
= &diskobj
->media
;
424 /* Store first EFI system partition */
425 if (part
&& !efi_system_partition
.if_type
) {
427 disk_partition_t info
;
429 r
= part_get_info(desc
, part
, &info
);
431 return EFI_DEVICE_ERROR
;
432 if (info
.bootable
& PART_EFI_SYSTEM_PARTITION
) {
433 efi_system_partition
.if_type
= desc
->if_type
;
434 efi_system_partition
.devnum
= desc
->devnum
;
435 efi_system_partition
.part
= part
;
436 EFI_PRINT("EFI system partition: %s %d:%d\n",
437 blk_get_if_type_name(desc
->if_type
),
445 * efi_disk_create_partitions() - create handles and protocols for partitions
447 * Create handles and protocols for the partitions of a block device.
449 * @parent: handle of the parent disk
450 * @desc: block device
451 * @if_typename: interface type
452 * @diskid: device number
453 * @pdevname: device name
454 * Return: number of partitions created
456 int efi_disk_create_partitions(efi_handle_t parent
, struct blk_desc
*desc
,
457 const char *if_typename
, int diskid
,
458 const char *pdevname
)
461 char devname
[32] = { 0 }; /* dp->str is u16[32] long */
462 disk_partition_t info
;
464 struct efi_device_path
*dp
= NULL
;
466 struct efi_handler
*handler
;
468 /* Get the device path of the parent */
469 ret
= efi_search_protocol(parent
, &efi_guid_device_path
, &handler
);
470 if (ret
== EFI_SUCCESS
)
471 dp
= handler
->protocol_interface
;
473 /* Add devices for each partition */
474 for (part
= 1; part
<= MAX_SEARCH_PARTITIONS
; part
++) {
475 if (part_get_info(desc
, part
, &info
))
477 snprintf(devname
, sizeof(devname
), "%s:%d", pdevname
,
479 ret
= efi_disk_add_dev(parent
, dp
, if_typename
, desc
, diskid
,
480 info
.start
, part
, NULL
);
481 if (ret
!= EFI_SUCCESS
) {
482 printf("Adding partition %s failed\n", pdevname
);
492 * efi_disk_register() - register block devices
494 * U-Boot doesn't have a list of all online disk devices. So when running our
495 * EFI payload, we scan through all of the potentially available ones and
496 * store them in our object pool.
498 * This function is called in efi_init_obj_list().
500 * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
501 * Consider converting the code to look up devices as needed. The EFI device
502 * could be a child of the UCLASS_BLK block device, perhaps.
504 * Return: status code
506 efi_status_t
efi_disk_register(void)
508 struct efi_disk_obj
*disk
;
514 for (uclass_first_device_check(UCLASS_BLK
, &dev
); dev
;
515 uclass_next_device_check(&dev
)) {
516 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
517 const char *if_typename
= blk_get_if_type_name(desc
->if_type
);
519 /* Add block device for the full device */
520 printf("Scanning disk %s...\n", dev
->name
);
521 ret
= efi_disk_add_dev(NULL
, NULL
, if_typename
,
522 desc
, desc
->devnum
, 0, 0, &disk
);
523 if (ret
== EFI_NOT_READY
) {
524 printf("Disk %s not ready\n", dev
->name
);
528 printf("ERROR: failure to add disk device %s, r = %lu\n",
529 dev
->name
, ret
& ~EFI_ERROR_MASK
);
534 /* Partitions show up as block devices in EFI */
535 disks
+= efi_disk_create_partitions(
536 &disk
->header
, desc
, if_typename
,
537 desc
->devnum
, dev
->name
);
542 /* Search for all available disk devices */
543 for (if_type
= 0; if_type
< IF_TYPE_COUNT
; if_type
++) {
544 const struct blk_driver
*cur_drvr
;
545 const char *if_typename
;
547 cur_drvr
= blk_driver_lookup_type(if_type
);
551 if_typename
= cur_drvr
->if_typename
;
552 printf("Scanning disks on %s...\n", if_typename
);
553 for (i
= 0; i
< 4; i
++) {
554 struct blk_desc
*desc
;
555 char devname
[32] = { 0 }; /* dp->str is u16[32] long */
557 desc
= blk_get_devnum_by_type(if_type
, i
);
560 if (desc
->type
== DEV_TYPE_UNKNOWN
)
563 snprintf(devname
, sizeof(devname
), "%s%d",
566 /* Add block device for the full device */
567 ret
= efi_disk_add_dev(NULL
, NULL
, if_typename
, desc
,
569 if (ret
== EFI_NOT_READY
) {
570 printf("Disk %s not ready\n", devname
);
574 printf("ERROR: failure to add disk device %s, r = %lu\n",
575 devname
, ret
& ~EFI_ERROR_MASK
);
580 /* Partitions show up as block devices in EFI */
581 disks
+= efi_disk_create_partitions
582 (&disk
->header
, desc
,
583 if_typename
, i
, devname
);
587 printf("Found %d disks\n", disks
);
593 * efi_disk_is_system_part() - check if handle refers to an EFI system partition
595 * @handle: handle of partition
597 * Return: true if handle refers to an EFI system partition
599 bool efi_disk_is_system_part(efi_handle_t handle
)
601 struct efi_handler
*handler
;
602 struct efi_disk_obj
*diskobj
;
603 disk_partition_t info
;
607 /* check if this is a block device */
608 ret
= efi_search_protocol(handle
, &efi_block_io_guid
, &handler
);
609 if (ret
!= EFI_SUCCESS
)
612 diskobj
= container_of(handle
, struct efi_disk_obj
, header
);
614 r
= part_get_info(diskobj
->desc
, diskobj
->part
, &info
);
618 return !!(info
.bootable
& PART_EFI_SYSTEM_PARTITION
);