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![Heinrich Schuchardt](/assets/img/avatar_default.png)
Use Sphinx style comments for describing function parameters. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
211 lines
5.4 KiB
C
211 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI block driver
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*
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* Copyright (c) 2017 Heinrich Schuchardt
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*
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* The EFI uclass creates a handle for this driver and installs the
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* driver binding protocol on it.
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*
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* The EFI block driver binds to controllers implementing the block io
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* protocol.
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*
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* When the bind function of the EFI block driver is called it creates a
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* new U-Boot block device. It installs child handles for all partitions and
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* installs the simple file protocol on these.
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*
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* The read and write functions of the EFI block driver delegate calls to the
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* controller that it is bound to.
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*
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* A usage example is as following:
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*
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* U-Boot loads the iPXE snp.efi executable. iPXE connects an iSCSI drive and
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* exposes a handle with the block IO protocol. It calls ConnectController.
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*
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* Now the EFI block driver installs the partitions with the simple file
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* protocol.
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*
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* iPXE uses the simple file protocol to load Grub or the Linux Kernel.
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*/
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#include <efi_driver.h>
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#include <dm/device-internal.h>
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#include <dm/root.h>
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/*
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* EFI attributes of the udevice handled by this driver.
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*
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* handle handle of the controller on which this driver is installed
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* io block io protocol proxied by this driver
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*/
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struct efi_blk_platdata {
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efi_handle_t handle;
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struct efi_block_io *io;
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};
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/**
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* Read from block device
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*
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* @dev: device
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* @blknr: first block to be read
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* @blkcnt: number of blocks to read
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* @buffer: output buffer
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* Return: number of blocks transferred
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*/
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static ulong efi_bl_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
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void *buffer)
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{
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struct efi_blk_platdata *platdata = dev_get_platdata(dev);
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struct efi_block_io *io = platdata->io;
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efi_status_t ret;
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EFI_PRINT("%s: read '%s', from block " LBAFU ", " LBAFU " blocks\n",
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__func__, dev->name, blknr, blkcnt);
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ret = EFI_CALL(io->read_blocks(
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io, io->media->media_id, (u64)blknr,
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(efi_uintn_t)blkcnt *
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(efi_uintn_t)io->media->block_size, buffer));
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EFI_PRINT("%s: r = %u\n", __func__,
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(unsigned int)(ret & ~EFI_ERROR_MASK));
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if (ret != EFI_SUCCESS)
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return 0;
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return blkcnt;
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}
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/**
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* Write to block device
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*
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* @dev: device
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* @blknr: first block to be write
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* @blkcnt: number of blocks to write
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* @buffer: input buffer
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* Return: number of blocks transferred
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*/
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static ulong efi_bl_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
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const void *buffer)
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{
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struct efi_blk_platdata *platdata = dev_get_platdata(dev);
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struct efi_block_io *io = platdata->io;
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efi_status_t ret;
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EFI_PRINT("%s: write '%s', from block " LBAFU ", " LBAFU " blocks\n",
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__func__, dev->name, blknr, blkcnt);
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ret = EFI_CALL(io->write_blocks(
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io, io->media->media_id, (u64)blknr,
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(efi_uintn_t)blkcnt *
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(efi_uintn_t)io->media->block_size,
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(void *)buffer));
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EFI_PRINT("%s: r = %u\n", __func__,
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(unsigned int)(ret & ~EFI_ERROR_MASK));
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if (ret != EFI_SUCCESS)
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return 0;
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return blkcnt;
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}
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/**
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* Create partions for the block device.
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*
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* @handle: EFI handle of the block device
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* @dev: udevice of the block device
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* Return: number of partitions created
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*/
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static int efi_bl_bind_partitions(efi_handle_t handle, struct udevice *dev)
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{
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struct blk_desc *desc;
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const char *if_typename;
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desc = dev_get_uclass_platdata(dev);
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if_typename = blk_get_if_type_name(desc->if_type);
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return efi_disk_create_partitions(handle, desc, if_typename,
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desc->devnum, dev->name);
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}
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/**
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* Create a block device for a handle
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*
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* @handle: handle
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* @interface: block io protocol
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* Return: 0 = success
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*/
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static int efi_bl_bind(efi_handle_t handle, void *interface)
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{
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struct udevice *bdev, *parent = dm_root();
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int ret, devnum;
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char *name;
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struct efi_object *obj = efi_search_obj(handle);
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struct efi_block_io *io = interface;
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int disks;
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struct efi_blk_platdata *platdata;
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EFI_PRINT("%s: handle %p, interface %p\n", __func__, handle, io);
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if (!obj)
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return -ENOENT;
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devnum = blk_find_max_devnum(IF_TYPE_EFI);
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if (devnum == -ENODEV)
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devnum = 0;
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else if (devnum < 0)
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return devnum;
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name = calloc(1, 18); /* strlen("efiblk#2147483648") + 1 */
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if (!name)
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return -ENOMEM;
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sprintf(name, "efiblk#%d", devnum);
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/* Create driver model udevice for the EFI block io device */
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ret = blk_create_device(parent, "efi_blk", name, IF_TYPE_EFI, devnum,
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io->media->block_size,
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(lbaint_t)io->media->last_block, &bdev);
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if (ret)
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return ret;
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if (!bdev)
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return -ENOENT;
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/* Set the DM_FLAG_NAME_ALLOCED flag to avoid a memory leak */
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device_set_name_alloced(bdev);
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platdata = dev_get_platdata(bdev);
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platdata->handle = handle;
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platdata->io = interface;
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ret = device_probe(bdev);
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if (ret)
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return ret;
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EFI_PRINT("%s: block device '%s' created\n", __func__, bdev->name);
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/* Create handles for the partions of the block device */
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disks = efi_bl_bind_partitions(handle, bdev);
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EFI_PRINT("Found %d partitions\n", disks);
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return 0;
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}
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/* Block device driver operators */
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static const struct blk_ops efi_blk_ops = {
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.read = efi_bl_read,
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.write = efi_bl_write,
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};
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/* Identify as block device driver */
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U_BOOT_DRIVER(efi_blk) = {
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.name = "efi_blk",
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.id = UCLASS_BLK,
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.ops = &efi_blk_ops,
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.platdata_auto_alloc_size = sizeof(struct efi_blk_platdata),
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};
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/* EFI driver operators */
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static const struct efi_driver_ops driver_ops = {
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.protocol = &efi_block_io_guid,
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.child_protocol = &efi_block_io_guid,
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.bind = efi_bl_bind,
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};
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/* Identify as EFI driver */
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U_BOOT_DRIVER(efi_block) = {
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.name = "EFI block driver",
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.id = UCLASS_EFI,
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.ops = &driver_ops,
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};
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