An EFI application may create an EFI block device (EFI_BLOCK_IO_PROTOCOL) in EFI world, which in turn generates a corresponding U-Boot block device based on U-Boot's Driver Model. The latter device, however, doesn't work as U-Boot proper block device due to an issue in efi_driver's implementation. We saw discussions in the past, most recently in [1].

[1] https://lists.denx.de/pipermail/u-boot/2023-July/522565.html

This RFC patch tries to address (part of) the issue. If it is considered acceptable, I will create a formal patch.

Withtout this patch, ===8<=== => env set efi_selftest 'block device' => bootefi selftest ...

Summary: 0 failures

=> dm tree Class Index Probed Driver Name ----------------------------------------------------------- root 0 [ + ] root_driver root_driver ... bootmeth 7 [ ] vbe_simple | `-- vbe_simple blk 0 [ + ] efi_blk `-- efiblk#0 partition 0 [ + ] blk_partition `-- efiblk#0:1 => ls efiloader 0:1 ** Bad device specification efiloader 0 ** Couldn't find partition efiloader 0:1 ===>8===

With this patch applied, efiblk#0(:1) now gets accessible.

===8<=== => env set efi_selftest 'block device' => bootefi selftest ...

Summary: 0 failures

=> dm tree Class Index Probed Driver Name ----------------------------------------------------------- root 0 [ + ] root_driver root_driver ... bootmeth 7 [ ] vbe_simple | `-- vbe_simple efi 0 [ + ] EFI block driver `-- /VenHw(dbca4c98-6cb0-694d-0872-819c650cb7b8) blk 0 [ + ] efi_blk `-- efiblk#0 partition 0 [ + ] blk_partition `-- efiblk#0:1 => ls efiloader 0:1 13 hello.txt 7 u-boot.txt

2 file(s), 0 dir(s) ===>8===

Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- include/efi_driver.h | 2 +- lib/efi_driver/efi_block_device.c | 17 ++++++++++++----- lib/efi_driver/efi_uclass.c | 8 +++++++- lib/efi_selftest/efi_selftest_block_device.c | 2 ++ 4 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/include/efi_driver.h b/include/efi_driver.h index 63a95e4cf800..ed66796f3519 100644 --- a/include/efi_driver.h +++ b/include/efi_driver.h @@ -42,7 +42,7 @@ struct efi_driver_ops { const efi_guid_t *child_protocol; efi_status_t (*init)(struct efi_driver_binding_extended_protocol *this); efi_status_t (*bind)(struct efi_driver_binding_extended_protocol *this, - efi_handle_t handle, void *interface); + efi_handle_t handle, void *interface, char *name); };

#endif /* _EFI_DRIVER_H */ diff --git a/lib/efi_driver/efi_block_device.c b/lib/efi_driver/efi_block_device.c index add00eeebbea..43b7ed7c973c 100644 --- a/lib/efi_driver/efi_block_device.c +++ b/lib/efi_driver/efi_block_device.c @@ -115,9 +115,9 @@ static ulong efi_bl_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, * Return: status code */ static efi_status_t -efi_bl_create_block_device(efi_handle_t handle, void *interface) +efi_bl_create_block_device(efi_handle_t handle, void *interface, struct udevice *parent) { - struct udevice *bdev = NULL, *parent = dm_root(); + struct udevice *bdev = NULL; efi_status_t ret; int devnum; char *name; @@ -181,7 +181,7 @@ err: */ static efi_status_t efi_bl_bind( struct efi_driver_binding_extended_protocol *this, - efi_handle_t handle, void *interface) + efi_handle_t handle, void *interface, char *name) { efi_status_t ret = EFI_SUCCESS; struct efi_object *obj = efi_search_obj(handle); @@ -191,8 +191,15 @@ static efi_status_t efi_bl_bind( if (!obj || !interface) return EFI_INVALID_PARAMETER;

- if (!handle->dev) - ret = efi_bl_create_block_device(handle, interface); + if (!handle->dev) { + struct udevice *parent; + + ret = device_bind_driver(dm_root(), "EFI block driver", name, &parent); + if (!ret) + ret = efi_bl_create_block_device(handle, interface, parent); + else + ret = EFI_DEVICE_ERROR; + }

return ret; } diff --git a/lib/efi_driver/efi_uclass.c b/lib/efi_driver/efi_uclass.c index 45f935198874..bf669742783e 100644 --- a/lib/efi_driver/efi_uclass.c +++ b/lib/efi_driver/efi_uclass.c @@ -145,7 +145,13 @@ static efi_status_t EFIAPI efi_uc_start( ret = check_node_type(controller_handle); if (ret != EFI_SUCCESS) goto err; - ret = bp->ops->bind(bp, controller_handle, interface); + + struct efi_handler *handler; + char tmpname[256] = "AppName"; + ret = efi_search_protocol(controller_handle, &efi_guid_device_path, + &handler); + snprintf(tmpname, 256, "%pD", handler->protocol_interface); + ret = bp->ops->bind(bp, controller_handle, interface, strdup(tmpname)); if (ret == EFI_SUCCESS) goto out;

diff --git a/lib/efi_selftest/efi_selftest_block_device.c b/lib/efi_selftest/efi_selftest_block_device.c index a367e8b89d17..0ab8e4590dfe 100644 --- a/lib/efi_selftest/efi_selftest_block_device.c +++ b/lib/efi_selftest/efi_selftest_block_device.c @@ -248,6 +248,7 @@ static int teardown(void) { efi_status_t r = EFI_ST_SUCCESS;

+#if 0 /* Temporarily out for confirmation */ if (disk_handle) { r = boottime->uninstall_protocol_interface(disk_handle, &guid_device_path, @@ -273,6 +274,7 @@ static int teardown(void) return EFI_ST_FAILURE; } } +#endif return r; }