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blk: blkmap: Add basic infrastructure

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blkmaps are loosely modeled on Linux's device mapper subsystem. The
basic idea is that you can create virtual block devices whose blocks
can be backed by a plethora of sources that are user configurable.

This change just adds the basic infrastructure for creating and
removing blkmap devices. Subsequent changes will extend this to add
support for actual mappings.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Tobias Waldekranz
2023-02-16 16:33:49 +01:00
committed by Tom Rini
parent 3d2fc79714
commit c41e209ea6
7 changed files with 405 additions and 0 deletions
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include/dm/uclass-id.h
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@@ -37,6 +37,7 @@ enum uclass_id {
UCLASS_AUDIO_CODEC, /* Audio codec with control and data path */
UCLASS_AXI, /* AXI bus */
UCLASS_BLK, /* Block device */
UCLASS_BLKMAP, /* Composable virtual block device */
UCLASS_BOOTCOUNT, /* Bootcount backing store */
UCLASS_BOOTDEV, /* Boot device for locating an OS to boot */
UCLASS_BOOTMETH, /* Bootmethod for booting an OS */