[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 <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;
};

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_DEVICE_ERROR);
}

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;
}

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