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blk-crypto: show supported key types in sysfs

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Add sysfs files that indicate which type(s) of keys are supported by the
inline encryption hardware associated with a particular request queue:

	/sys/block/$disk/queue/crypto/hw_wrapped_keys
	/sys/block/$disk/queue/crypto/raw_keys

Userspace can use the presence or absence of these files to decide what
encyption settings to use.

Don't use a single key_type file, as devices might support both key
types at the same time.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Tested-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> # sm8650
Link: https://lore.kernel.org/r/20250204060041.409950-3-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Eric Biggers
2025-02-03 22:00:36 -08:00
committed by Jens Axboe
parent ebc4176551
commit e35fde43e2
2 changed files with 55 additions and 0 deletions
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20
Documentation/ABI/stable/sysfs-block
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@@ -229,6 +229,17 @@ Description:
encryption, refer to Documentation/block/inline-encryption.rst.
What: /sys/block/<disk>/queue/crypto/hw_wrapped_keys
Date: February 2025
Contact: linux-block@vger.kernel.org
Description:
[RO] The presence of this file indicates that the device
supports hardware-wrapped inline encryption keys, i.e. key blobs
that can only be unwrapped and used by dedicated hardware. For
more information about hardware-wrapped inline encryption keys,
see Documentation/block/inline-encryption.rst.
What: /sys/block/<disk>/queue/crypto/max_dun_bits
Date: February 2022
Contact: linux-block@vger.kernel.org
@@ -267,6 +278,15 @@ Description:
use with inline encryption.
What: /sys/block/<disk>/queue/crypto/raw_keys
Date: February 2025
Contact: linux-block@vger.kernel.org
Description:
[RO] The presence of this file indicates that the device
supports raw inline encryption keys, i.e. keys that are managed
in raw, plaintext form in software.
What: /sys/block/<disk>/queue/dax
Date: June 2016
Contact: linux-block@vger.kernel.org