[J-u-boot.git] / lib / efi_loader / efi_disk.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *  EFI application disk support
 *
 *  Copyright (c) 2016 Alexander Graf
 */

#include <common.h>
#include <blk.h>
#include <dm.h>
#include <efi_loader.h>
#include <fs.h>
#include <part.h>
#include <malloc.h>

const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;

/**
 * struct efi_disk_obj - EFI disk object
 *
 * @header:	EFI object header
 * @ops:	EFI disk I/O protocol interface
 * @ifname:	interface name for block device
 * @dev_index:	device index of block device
 * @media:	block I/O media information
 * @dp:		device path to the block device
 * @part:	partition
 * @volume:	simple file system protocol of the partition
 * @offset:	offset into disk for simple partition
 * @desc:	internal block device descriptor
 */
struct efi_disk_obj {
	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;
}

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 */
	if ((uintptr_t)buffer & (this->media->io_align - 1))
		return EFI_INVALID_PARAMETER;
	if (lba * this->media->block_size + buffer_size >
	    this->media->last_block * this->media->block_size)
		return EFI_INVALID_PARAMETER;

#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
		r = efi_disk_read_blocks(this, media_id, lba,
			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);
}

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 */
	if ((uintptr_t)buffer & (this->media->io_align - 1))
		return EFI_INVALID_PARAMETER;
	if (lba * this->media->block_size + buffer_size >
	    this->media->last_block * this->media->block_size)
		return EFI_INVALID_PARAMETER;

#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
		r = efi_disk_write_blocks(this, media_id, lba,
			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);
}

static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
{
	/* We always write synchronously */
	EFI_ENTRY("%p", this);
	return EFI_EXIT(EFI_SUCCESS);
}

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,
};

/*
 * Get 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);
	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;
}

/*
 * 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
 * @offset	offset into disk for simple partitions
 * @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,
				lbaint_t offset,
				unsigned int part,
				struct efi_disk_obj **disk)
{
	struct efi_disk_obj *diskobj;
	efi_status_t ret;

	/* Don't add empty devices */
	if (!desc->lba)
		return 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) {
		struct efi_device_path *node = efi_dp_part_node(desc, part);

		diskobj->dp = efi_dp_append_node(dp_parent, node);
		efi_free_pool(node);
	} else {
		diskobj->dp = efi_dp_from_part(desc, part);
	}
	diskobj->part = part;
	ret = efi_add_protocol(&diskobj->header, &efi_block_io_guid,
			       &diskobj->ops);
	if (ret != EFI_SUCCESS)
		return ret;
	ret = efi_add_protocol(&diskobj->header, &efi_guid_device_path,
			       diskobj->dp);
	if (ret != EFI_SUCCESS)
		return ret;
	/* partitions or whole disk without partitions */
	if ((part || desc->part_type == PART_TYPE_UNKNOWN) &&
	    efi_fs_exists(desc, part)) {
		diskobj->volume = efi_simple_file_system(desc, part,
							 diskobj->dp);
		ret = efi_add_protocol(&diskobj->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->offset = offset;
	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;
	diskobj->media.last_block = desc->lba - offset;
	if (part != 0)
		diskobj->media.logical_partition = 1;
	diskobj->ops.media = &diskobj->media;
	if (disk)
		*disk = diskobj;
	return EFI_SUCCESS;
}

/*
 * Create handles and protocols for the partitions of a block device
 *
 * @parent		handle of the parent disk
 * @blk_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 */
	disk_partition_t info;
	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++) {
		if (part_get_info(desc, part, &info))
			continue;
		snprintf(devname, sizeof(devname), "%s:%d", pdevname,
			 part);
		ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
				       info.start, part, NULL);
		if (ret != EFI_SUCCESS) {
			printf("Adding partition %s failed\n", pdevname);
			continue;
		}
		disks++;
	}

	return disks;
}

/*
 * 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.
 *
 * TODO([email protected]): Actually with CONFIG_BLK, U-Boot does have this.
 * Consider converting the code to look up devices as needed. The EFI device
 * could be a child of the UCLASS_BLK block device, perhaps.
 *
 * This gets called from do_bootefi_exec().
 */
efi_status_t efi_disk_register(void)
{
	struct efi_disk_obj *disk;
	int disks = 0;
	efi_status_t ret;
#ifdef CONFIG_BLK
	struct udevice *dev;

	for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
	     uclass_next_device_check(&dev)) {
		struct blk_desc *desc = dev_get_uclass_platdata(dev);
		const char *if_typename = blk_get_if_type_name(desc->if_type);

		/* Add block device for the full device */
		printf("Scanning disk %s...\n", dev->name);
		ret = efi_disk_add_dev(NULL, NULL, if_typename,
					desc, desc->devnum, 0, 0, &disk);
		if (ret == EFI_NOT_READY) {
			printf("Disk %s not ready\n", dev->name);
			continue;
		}
		if (ret) {
			printf("ERROR: failure to add disk device %s, r = %lu\n",
			       dev->name, ret & ~EFI_ERROR_MASK);
			return ret;
		}
		disks++;

		/* Partitions show up as block devices in EFI */
		disks += efi_disk_create_partitions(
					&disk->header, desc, if_typename,
					desc->devnum, dev->name);
	}
#else
	int i, if_type;

	/* Search for all available disk devices */
	for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
		const struct blk_driver *cur_drvr;
		const char *if_typename;

		cur_drvr = blk_driver_lookup_type(if_type);
		if (!cur_drvr)
			continue;

		if_typename = cur_drvr->if_typename;
		printf("Scanning disks on %s...\n", if_typename);
		for (i = 0; i < 4; i++) {
			struct blk_desc *desc;
			char devname[32] = { 0 }; /* dp->str is u16[32] long */

			desc = blk_get_devnum_by_type(if_type, i);
			if (!desc)
				continue;
			if (desc->type == DEV_TYPE_UNKNOWN)
				continue;

			snprintf(devname, sizeof(devname), "%s%d",
				 if_typename, i);

			/* Add block device for the full device */
			ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
					       i, 0, 0, &disk);
			if (ret == EFI_NOT_READY) {
				printf("Disk %s not ready\n", devname);
				continue;
			}
			if (ret) {
				printf("ERROR: failure to add disk device %s, r = %lu\n",
				       devname, ret & ~EFI_ERROR_MASK);
				return ret;
			}
			disks++;

			/* Partitions show up as block devices in EFI */
			disks += efi_disk_create_partitions
						(&disk->header, desc,
						 if_typename, i, devname);
		}
	}
#endif
	printf("Found %d disks\n", disks);

	return EFI_SUCCESS;
}
Commit	Line	Data
f739fcd8	1	// SPDX-License-Identifier: GPL-2.0+
2a22d05d AG	2	/*
	3	* EFI application disk support
	4	*
	5	* Copyright (c) 2016 Alexander Graf
2a22d05d AG	6	*/
	7
	8	#include <common.h>
6dd9faf8	9	#include <blk.h>
487d756f	10	#include <dm.h>
2a22d05d	11	#include <efi_loader.h>
86740067	12	#include <fs.h>
2a22d05d AG	13	#include <part.h>
	14	#include <malloc.h>
	15
dec88e41	16	const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
2a22d05d	17
d39646a3 HS	18	/**
	19	* struct efi_disk_obj - EFI disk object
	20	*
	21	* @header: EFI object header
	22	* @ops: EFI disk I/O protocol interface
	23	* @ifname: interface name for block device
	24	* @dev_index: device index of block device
	25	* @media: block I/O media information
	26	* @dp: device path to the block device
	27	* @part: partition
	28	* @volume: simple file system protocol of the partition
	29	* @offset: offset into disk for simple partition
	30	* @desc: internal block device descriptor
	31	*/
2a22d05d	32	struct efi_disk_obj {
d39646a3	33	struct efi_object header;
2a22d05d	34	struct efi_block_io ops;
2a22d05d	35	const char *ifname;
2a22d05d	36	int dev_index;
2a22d05d	37	struct efi_block_io_media media;
884bcf6f	38	struct efi_device_path *dp;
884bcf6f	39	unsigned int part;
2a92080d	40	struct efi_simple_file_system_protocol *volume;
8c3df0bf	41	lbaint_t offset;
884bcf6f	42	struct blk_desc *desc;
2a22d05d AG	43	};
2a22d05d AG	44
cda9b352 HS	45	/**
	46	* efi_disk_reset() - reset block device
	47	*
	48	* This function implements the Reset service of the EFI_BLOCK_IO_PROTOCOL.
	49	*
	50	* As U-Boot's block devices do not have a reset function simply return
	51	* EFI_SUCCESS.
	52	*
	53	* See the Unified Extensible Firmware Interface (UEFI) specification for
	54	* details.
	55	*
	56	* @this: pointer to the BLOCK_IO_PROTOCOL
	57	* @extended_verification: extended verification
	58	* Return: status code
	59	*/
2a22d05d AG	60	static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
	61	char extended_verification)
	62	{
	63	EFI_ENTRY("%p, %x", this, extended_verification);
cda9b352	64	return EFI_EXIT(EFI_SUCCESS);
2a22d05d AG	65	}
	66
	67	enum efi_disk_direction {
	68	EFI_DISK_READ,
	69	EFI_DISK_WRITE,
	70	};
	71
a80a232e	72	static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
2a22d05d AG	73	u32 media_id, u64 lba, unsigned long buffer_size,
	74	void *buffer, enum efi_disk_direction direction)
	75	{
	76	struct efi_disk_obj *diskobj;
	77	struct blk_desc *desc;
	78	int blksz;
	79	int blocks;
	80	unsigned long n;
	81
2a22d05d	82	diskobj = container_of(this, struct efi_disk_obj, ops);
f9d334bd	83	desc = (struct blk_desc *) diskobj->desc;
2a22d05d AG	84	blksz = desc->blksz;
2a22d05d AG	85	blocks = buffer_size / blksz;
8c3df0bf	86	lba += diskobj->offset;
2a22d05d	87
9d3f3398 HS	88	EFI_PRINT("blocks=%x lba=%llx blksz=%x dir=%d\n",
9d3f3398 HS	89	blocks, lba, blksz, direction);
2a22d05d AG	90
	91	/* We only support full block access */
	92	if (buffer_size & (blksz - 1))
f59f0825	93	return EFI_BAD_BUFFER_SIZE;
2a22d05d AG	94
2a22d05d AG	95	if (direction == EFI_DISK_READ)
487d756f	96	n = blk_dread(desc, lba, blocks, buffer);
2a22d05d	97	else
487d756f	98	n = blk_dwrite(desc, lba, blocks, buffer);
2a22d05d AG	99
	100	/* We don't do interrupts, so check for timers cooperatively */
	101	efi_timer_check();
	102
9d3f3398	103	EFI_PRINT("n=%lx blocks=%x\n", n, blocks);
edcef3ba	104
2a22d05d	105	if (n != blocks)
3304990b	106	return EFI_DEVICE_ERROR;
2a22d05d	107
3304990b	108	return EFI_SUCCESS;
2a22d05d AG	109	}
2a22d05d AG	110
e275458c	111	static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
4f94865b	112	u32 media_id, u64 lba, efi_uintn_t buffer_size,
2a22d05d AG	113	void *buffer)
2a22d05d AG	114	{
51735ae0 AG	115	void *real_buffer = buffer;
	116	efi_status_t r;
	117
f59f0825 HS	118	if (!this)
	119	return EFI_INVALID_PARAMETER;
	120	/* TODO: check for media changes */
	121	if (media_id != this->media->media_id)
	122	return EFI_MEDIA_CHANGED;
	123	if (!this->media->media_present)
	124	return EFI_NO_MEDIA;
	125	/* media->io_align is a power of 2 */
	126	if ((uintptr_t)buffer & (this->media->io_align - 1))
	127	return EFI_INVALID_PARAMETER;
	128	if (lba * this->media->block_size + buffer_size >
	129	this->media->last_block * this->media->block_size)
	130	return EFI_INVALID_PARAMETER;
	131
51735ae0 AG	132	#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	133	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
	134	r = efi_disk_read_blocks(this, media_id, lba,
	135	EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
	136	if (r != EFI_SUCCESS)
	137	return r;
	138	return efi_disk_read_blocks(this, media_id, lba +
	139	EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
	140	buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
	141	buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
	142	}
	143
	144	real_buffer = efi_bounce_buffer;
	145	#endif
	146
dee37fc9	147	EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
51735ae0 AG	148	buffer_size, buffer);
	149
	150	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
	151	EFI_DISK_READ);
	152
	153	/* Copy from bounce buffer to real buffer if necessary */
	154	if ((r == EFI_SUCCESS) && (real_buffer != buffer))
	155	memcpy(buffer, real_buffer, buffer_size);
	156
	157	return EFI_EXIT(r);
2a22d05d AG	158	}
2a22d05d AG	159
e275458c	160	static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
4f94865b	161	u32 media_id, u64 lba, efi_uintn_t buffer_size,
2a22d05d AG	162	void *buffer)
2a22d05d AG	163	{
51735ae0 AG	164	void *real_buffer = buffer;
	165	efi_status_t r;
	166
f59f0825 HS	167	if (!this)
	168	return EFI_INVALID_PARAMETER;
	169	if (this->media->read_only)
	170	return EFI_WRITE_PROTECTED;
	171	/* TODO: check for media changes */
	172	if (media_id != this->media->media_id)
	173	return EFI_MEDIA_CHANGED;
	174	if (!this->media->media_present)
	175	return EFI_NO_MEDIA;
	176	/* media->io_align is a power of 2 */
	177	if ((uintptr_t)buffer & (this->media->io_align - 1))
	178	return EFI_INVALID_PARAMETER;
	179	if (lba * this->media->block_size + buffer_size >
	180	this->media->last_block * this->media->block_size)
	181	return EFI_INVALID_PARAMETER;
	182
51735ae0 AG	183	#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	184	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
	185	r = efi_disk_write_blocks(this, media_id, lba,
	186	EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
	187	if (r != EFI_SUCCESS)
	188	return r;
	189	return efi_disk_write_blocks(this, media_id, lba +
	190	EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
	191	buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
	192	buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
	193	}
	194
	195	real_buffer = efi_bounce_buffer;
	196	#endif
	197
dee37fc9	198	EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
51735ae0 AG	199	buffer_size, buffer);
	200
	201	/* Populate bounce buffer if necessary */
	202	if (real_buffer != buffer)
	203	memcpy(real_buffer, buffer, buffer_size);
	204
	205	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
	206	EFI_DISK_WRITE);
	207
	208	return EFI_EXIT(r);
2a22d05d AG	209	}
	210
	211	static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
	212	{
	213	/* We always write synchronously */
	214	EFI_ENTRY("%p", this);
	215	return EFI_EXIT(EFI_SUCCESS);
	216	}
	217
	218	static const struct efi_block_io block_io_disk_template = {
	219	.reset = &efi_disk_reset,
	220	.read_blocks = &efi_disk_read_blocks,
	221	.write_blocks = &efi_disk_write_blocks,
	222	.flush_blocks = &efi_disk_flush_blocks,
	223	};
	224
2a92080d	225	/*
110d80a1 HS	226	* Get the simple file system protocol for a file device path.
	227	*
	228	* The full path provided is split into device part and into a file
	229	* part. The device part is used to find the handle on which the
	230	* simple file system protocol is installed.
	231	*
	232	* @full_path device path including device and file
	233	* @return simple file system protocol
2a92080d RC	234	*/
2a92080d RC	235	struct efi_simple_file_system_protocol *
110d80a1	236	efi_fs_from_path(struct efi_device_path *full_path)
2a92080d RC	237	{
2a92080d RC	238	struct efi_object *efiobj;
110d80a1 HS	239	struct efi_handler *handler;
	240	struct efi_device_path *device_path;
	241	struct efi_device_path *file_path;
	242	efi_status_t ret;
2a92080d	243
110d80a1 HS	244	/* Split the path into a device part and a file part */
	245	ret = efi_dp_split_file_path(full_path, &device_path, &file_path);
	246	if (ret != EFI_SUCCESS)
	247	return NULL;
	248	efi_free_pool(file_path);
	249
	250	/* Get the EFI object for the partition */
	251	efiobj = efi_dp_find_obj(device_path, NULL);
	252	efi_free_pool(device_path);
2a92080d RC	253	if (!efiobj)
	254	return NULL;
	255
110d80a1 HS	256	/* Find the simple file system protocol */
	257	ret = efi_search_protocol(efiobj, &efi_simple_file_system_protocol_guid,
	258	&handler);
	259	if (ret != EFI_SUCCESS)
	260	return NULL;
2a92080d	261
110d80a1 HS	262	/* Return the simple file system protocol for the partition */
110d80a1 HS	263	return handler->protocol_interface;
2a92080d RC	264	}
2a92080d RC	265
86740067 AT	266	/**
	267	* efi_fs_exists() - check if a partition bears a file system
	268	*
	269	* @desc: block device descriptor
	270	* @part: partition number
	271	* Return: 1 if a file system exists on the partition
	272	* 0 otherwise
	273	*/
	274	static int efi_fs_exists(struct blk_desc *desc, int part)
	275	{
	276	if (fs_set_blk_dev_with_part(desc, part))
	277	return 0;
	278
	279	if (fs_get_type() == FS_TYPE_ANY)
	280	return 0;
	281
	282	fs_close();
	283
	284	return 1;
	285	}
	286
93945f2c	287	/*
64e4db0f	288	* Create a handle for a partition or disk
93945f2c	289	*
64e4db0f HS	290	* @parent parent handle
64e4db0f HS	291	* @dp_parent parent device path
93945f2c HS	292	* @if_typename interface name for block device
	293	* @desc internal block device
	294	* @dev_index device index for block device
	295	* @offset offset into disk for simple partitions
64e4db0f	296	* @return disk object
93945f2c	297	*/
df9cf561	298	static efi_status_t efi_disk_add_dev(
64e4db0f HS	299	efi_handle_t parent,
	300	struct efi_device_path *dp_parent,
	301	const char *if_typename,
	302	struct blk_desc *desc,
	303	int dev_index,
	304	lbaint_t offset,
df9cf561 HS	305	unsigned int part,
df9cf561 HS	306	struct efi_disk_obj **disk)
4a12a97c AG	307	{
4a12a97c AG	308	struct efi_disk_obj *diskobj;
4b9f7aaf	309	efi_status_t ret;
4a12a97c	310
0812d1a0 AG	311	/* Don't add empty devices */
0812d1a0 AG	312	if (!desc->lba)
df9cf561	313	return EFI_NOT_READY;
0812d1a0	314
884bcf6f	315	diskobj = calloc(1, sizeof(*diskobj));
4b9f7aaf	316	if (!diskobj)
df9cf561	317	return EFI_OUT_OF_RESOURCES;
4b9f7aaf HS	318
4b9f7aaf HS	319	/* Hook up to the device list */
d39646a3	320	efi_add_handle(&diskobj->header);
4a12a97c AG	321
4a12a97c AG	322	/* Fill in object data */
64e4db0f HS	323	if (part) {
	324	struct efi_device_path *node = efi_dp_part_node(desc, part);
	325
	326	diskobj->dp = efi_dp_append_node(dp_parent, node);
	327	efi_free_pool(node);
	328	} else {
	329	diskobj->dp = efi_dp_from_part(desc, part);
	330	}
884bcf6f	331	diskobj->part = part;
d39646a3	332	ret = efi_add_protocol(&diskobj->header, &efi_block_io_guid,
4b9f7aaf HS	333	&diskobj->ops);
4b9f7aaf HS	334	if (ret != EFI_SUCCESS)
df9cf561	335	return ret;
d39646a3	336	ret = efi_add_protocol(&diskobj->header, &efi_guid_device_path,
4b9f7aaf HS	337	diskobj->dp);
4b9f7aaf HS	338	if (ret != EFI_SUCCESS)
df9cf561	339	return ret;
89cb6a5d AT	340	/* partitions or whole disk without partitions */
	341	if ((part \|\| desc->part_type == PART_TYPE_UNKNOWN) &&
	342	efi_fs_exists(desc, part)) {
2a92080d RC	343	diskobj->volume = efi_simple_file_system(desc, part,
2a92080d RC	344	diskobj->dp);
d39646a3	345	ret = efi_add_protocol(&diskobj->header,
4b9f7aaf	346	&efi_simple_file_system_protocol_guid,
22de1de9	347	diskobj->volume);
4b9f7aaf	348	if (ret != EFI_SUCCESS)
df9cf561	349	return ret;
2a92080d	350	}
4a12a97c	351	diskobj->ops = block_io_disk_template;
487d756f	352	diskobj->ifname = if_typename;
4a12a97c	353	diskobj->dev_index = dev_index;
8c3df0bf	354	diskobj->offset = offset;
f9d334bd	355	diskobj->desc = desc;
4a12a97c AG	356
	357	/* Fill in EFI IO Media info (for read/write callbacks) */
	358	diskobj->media.removable_media = desc->removable;
	359	diskobj->media.media_present = 1;
f59f0825 HS	360	/*
	361	* MediaID is just an arbitrary counter.
	362	* We have to change it if the medium is removed or changed.
	363	*/
	364	diskobj->media.media_id = 1;
4a12a97c AG	365	diskobj->media.block_size = desc->blksz;
4a12a97c AG	366	diskobj->media.io_align = desc->blksz;
0812d1a0	367	diskobj->media.last_block = desc->lba - offset;
5f770836 EV	368	if (part != 0)
5f770836 EV	369	diskobj->media.logical_partition = 1;
4a12a97c	370	diskobj->ops.media = &diskobj->media;
df9cf561 HS	371	if (disk)
	372	*disk = diskobj;
	373	return EFI_SUCCESS;
4a12a97c AG	374	}
4a12a97c AG	375
64e4db0f HS	376	/*
	377	* Create handles and protocols for the partitions of a block device
	378	*
	379	* @parent handle of the parent disk
	380	* @blk_desc block device
	381	* @if_typename interface type
	382	* @diskid device number
	383	* @pdevname device name
	384	* @return number of partitions created
	385	*/
	386	int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
	387	const char *if_typename, int diskid,
	388	const char *pdevname)
8c3df0bf AG	389	{
8c3df0bf AG	390	int disks = 0;
ecbe1a07	391	char devname[32] = { 0 }; /* dp->str is u16[32] long */
8c3df0bf	392	disk_partition_t info;
16a73b24	393	int part;
64e4db0f HS	394	struct efi_device_path *dp = NULL;
	395	efi_status_t ret;
	396	struct efi_handler *handler;
	397
	398	/* Get the device path of the parent */
	399	ret = efi_search_protocol(parent, &efi_guid_device_path, &handler);
	400	if (ret == EFI_SUCCESS)
	401	dp = handler->protocol_interface;
8c3df0bf	402
c034b7fd	403	/* Add devices for each partition */
16a73b24 JG	404	for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
	405	if (part_get_info(desc, part, &info))
	406	continue;
f9d334bd AG	407	snprintf(devname, sizeof(devname), "%s:%d", pdevname,
f9d334bd AG	408	part);
df9cf561 HS	409	ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
	410	info.start, part, NULL);
	411	if (ret != EFI_SUCCESS) {
	412	printf("Adding partition %s failed\n", pdevname);
	413	continue;
	414	}
8c3df0bf AG	415	disks++;
8c3df0bf AG	416	}
884bcf6f	417
8c3df0bf AG	418	return disks;
	419	}
	420
2a22d05d AG	421	/*
	422	* U-Boot doesn't have a list of all online disk devices. So when running our
	423	* EFI payload, we scan through all of the potentially available ones and
	424	* store them in our object pool.
	425	*
487d756f SG	426	* TODO([email protected]): Actually with CONFIG_BLK, U-Boot does have this.
	427	* Consider converting the code to look up devices as needed. The EFI device
	428	* could be a child of the UCLASS_BLK block device, perhaps.
	429	*
2a22d05d AG	430	* This gets called from do_bootefi_exec().
2a22d05d AG	431	*/
df9cf561	432	efi_status_t efi_disk_register(void)
2a22d05d	433	{
64e4db0f	434	struct efi_disk_obj *disk;
2a22d05d	435	int disks = 0;
df9cf561	436	efi_status_t ret;
487d756f SG	437	#ifdef CONFIG_BLK
	438	struct udevice *dev;
	439
df9cf561	440	for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
70bfcdc6	441	uclass_next_device_check(&dev)) {
487d756f	442	struct blk_desc *desc = dev_get_uclass_platdata(dev);
9bfca9f9	443	const char *if_typename = blk_get_if_type_name(desc->if_type);
487d756f	444
c034b7fd	445	/* Add block device for the full device */
df9cf561 HS	446	printf("Scanning disk %s...\n", dev->name);
	447	ret = efi_disk_add_dev(NULL, NULL, if_typename,
	448	desc, desc->devnum, 0, 0, &disk);
	449	if (ret == EFI_NOT_READY) {
	450	printf("Disk %s not ready\n", dev->name);
	451	continue;
	452	}
	453	if (ret) {
	454	printf("ERROR: failure to add disk device %s, r = %lu\n",
	455	dev->name, ret & ~EFI_ERROR_MASK);
	456	return ret;
	457	}
487d756f SG	458	disks++;
487d756f SG	459
c034b7fd	460	/* Partitions show up as block devices in EFI */
64e4db0f	461	disks += efi_disk_create_partitions(
d39646a3	462	&disk->header, desc, if_typename,
64e4db0f	463	desc->devnum, dev->name);
487d756f SG	464	}
	465	#else
	466	int i, if_type;
2a22d05d AG	467
2a22d05d AG	468	/* Search for all available disk devices */
6dd9faf8	469	for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
487d756f SG	470	const struct blk_driver *cur_drvr;
	471	const char *if_typename;
	472
6dd9faf8 SG	473	cur_drvr = blk_driver_lookup_type(if_type);
	474	if (!cur_drvr)
	475	continue;
	476
487d756f SG	477	if_typename = cur_drvr->if_typename;
487d756f SG	478	printf("Scanning disks on %s...\n", if_typename);
2a22d05d AG	479	for (i = 0; i < 4; i++) {
2a22d05d AG	480	struct blk_desc *desc;
ecbe1a07	481	char devname[32] = { 0 }; /* dp->str is u16[32] long */
2a22d05d	482
6dd9faf8	483	desc = blk_get_devnum_by_type(if_type, i);
2a22d05d AG	484	if (!desc)
	485	continue;
	486	if (desc->type == DEV_TYPE_UNKNOWN)
	487	continue;
	488
2a22d05d	489	snprintf(devname, sizeof(devname), "%s%d",
487d756f	490	if_typename, i);
77511b3b	491
c034b7fd	492	/* Add block device for the full device */
df9cf561 HS	493	ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
	494	i, 0, 0, &disk);
	495	if (ret == EFI_NOT_READY) {
	496	printf("Disk %s not ready\n", devname);
	497	continue;
	498	}
	499	if (ret) {
	500	printf("ERROR: failure to add disk device %s, r = %lu\n",
	501	devname, ret & ~EFI_ERROR_MASK);
	502	return ret;
	503	}
2a22d05d	504	disks++;
8c3df0bf	505
c034b7fd	506	/* Partitions show up as block devices in EFI */
fae0118e	507	disks += efi_disk_create_partitions
d39646a3	508	(&disk->header, desc,
fae0118e	509	if_typename, i, devname);
2a22d05d AG	510	}
2a22d05d AG	511	}
487d756f	512	#endif
2a22d05d AG	513	printf("Found %d disks\n", disks);
2a22d05d AG	514
df9cf561	515	return EFI_SUCCESS;
2a22d05d	516	}