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efi_loader: disk: a helper function to delete efi_disk objects

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This function is expected to be called, in particular from dm's pre_remove
hook, when associated block devices no longer exist.

Add efi_disk_remove() function.
This function removes an efi_disk object for a raw disk device (UCLASS_BLK)
and related objects for its partitions (UCLASS_PARTITION).

So this function is expected to be called through driver model's "remove"
interface every time a raw disk device is to be disconnected.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
AKASHI Takahiro 2022-04-19 10:05:14 +09:00 • committed by Heinrich Schuchardt
parent 3c809dfed7
commit b406eb04c3
1 changed files with 88 additions and 0 deletions
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88
lib/efi_loader/efi_disk.c
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@ -635,6 +635,87 @@ static int efi_disk_probe(void *ctx, struct event *event)
return 0;
}
/*
* Delete an efi_disk object for a whole raw disk
*
* @dev uclass device (UCLASS_BLK)
*
* Delete an efi_disk object which is associated with @dev.
* The type of @dev must be UCLASS_BLK.
*
* @return 0 on success, -1 otherwise
*/
static int efi_disk_delete_raw(struct udevice *dev)
{
efi_handle_t handle;
struct efi_disk_obj *diskobj;
if (dev_tag_get_ptr(dev, DM_TAG_EFI, (void **)&handle))
return -1;
diskobj = container_of(handle, struct efi_disk_obj, header);
efi_free_pool(diskobj->dp);
efi_delete_handle(handle);
dev_tag_del(dev, DM_TAG_EFI);
return 0;
}
/*
* Delete an efi_disk object for a disk partition
*
* @dev uclass device (UCLASS_PARTITION)
*
* Delete an efi_disk object which is associated with @dev.
* The type of @dev must be UCLASS_PARTITION.
*
* @return 0 on success, -1 otherwise
*/
static int efi_disk_delete_part(struct udevice *dev)
{
efi_handle_t handle;
struct efi_disk_obj *diskobj;
if (dev_tag_get_ptr(dev, DM_TAG_EFI, (void **)&handle))
return -1;
diskobj = container_of(handle, struct efi_disk_obj, header);
efi_free_pool(diskobj->dp);
efi_delete_handle(handle);
dev_tag_del(dev, DM_TAG_EFI);
return 0;
}
/*
* Delete an efi_disk object for a block device
*
* @dev uclass device (UCLASS_BLK or UCLASS_PARTITION)
*
* Delete an efi_disk object which is associated with @dev.
* The type of @dev must be either UCLASS_BLK or UCLASS_PARTITION.
* This function is expected to be called at EV_PM_PRE_REMOVE.
*
* @return 0 on success, -1 otherwise
*/
static int efi_disk_remove(void *ctx, struct event *event)
{
enum uclass_id id;
struct udevice *dev;
dev = event->data.dm.dev;
id = device_get_uclass_id(dev);
if (id == UCLASS_BLK)
return efi_disk_delete_raw(dev);
else if (id == UCLASS_PARTITION)
return efi_disk_delete_part(dev);
else
return 0;
}
efi_status_t efi_disk_init(void)
{
int ret;
@ -646,5 +727,12 @@ efi_status_t efi_disk_init(void)
return EFI_OUT_OF_RESOURCES;
}
ret = event_register("efi_disk del", EVT_DM_PRE_REMOVE,
efi_disk_remove, NULL);
if (ret) {
log_err("Event registration for efi_disk del failed\n");
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}