From: Eric Biggers <[email protected]> Wire up the wrapped key support for ufs-qcom by implementing the needed methods in struct blk_crypto_ll_ops and setting the appropriate flags in blk_crypto_profile::key_types_supported.
For more information about this feature and how to use it, refer to the sections about hardware-wrapped keys in Documentation/block/inline-encryption.rst and Documentation/filesystems/fscrypt.rst. Based on patches by Gaurav Kashyap <[email protected]>. Reworked to use the custom crypto profile support. Tested-by: Bartosz Golaszewski <[email protected]> # sm8650 Signed-off-by: Eric Biggers <[email protected]> --- drivers/ufs/host/ufs-qcom.c | 54 ++++++++++++++++++++++++++++++++----- 1 file changed, 48 insertions(+), 6 deletions(-) diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c index 9c700bbaa12c..c9cca4348dab 100644 --- a/drivers/ufs/host/ufs-qcom.c +++ b/drivers/ufs/host/ufs-qcom.c @@ -132,15 +132,10 @@ static int ufs_qcom_ice_init(struct ufs_qcom_host *host) } if (IS_ERR_OR_NULL(ice)) return PTR_ERR_OR_ZERO(ice); - if (qcom_ice_using_hwkm(ice)) { - dev_warn(dev, "HWKM mode unsupported; disabling inline encryption support\n"); - return 0; - } - host->ice = ice; /* Initialize the blk_crypto_profile */ caps.reg_val = cpu_to_le32(ufshcd_readl(hba, REG_UFS_CCAP)); @@ -150,11 +145,14 @@ static int ufs_qcom_ice_init(struct ufs_qcom_host *host) if (err) return err; profile->ll_ops = ufs_qcom_crypto_ops; profile->max_dun_bytes_supported = 8; - profile->key_types_supported = BLK_CRYPTO_KEY_TYPE_RAW; + if (qcom_ice_using_hwkm(ice)) + profile->key_types_supported = BLK_CRYPTO_KEY_TYPE_HW_WRAPPED; + else + profile->key_types_supported = BLK_CRYPTO_KEY_TYPE_RAW; profile->dev = dev; /* * Currently this driver only supports AES-256-XTS. All known versions * of ICE support it, but to be safe make sure it is really declared in @@ -218,13 +216,57 @@ static int ufs_qcom_ice_keyslot_evict(struct blk_crypto_profile *profile, err = qcom_ice_evict_key(host->ice, slot); ufshcd_release(hba); return err; } +static int ufs_qcom_ice_derive_sw_secret(struct blk_crypto_profile *profile, + const u8 *eph_key, size_t eph_key_size, + u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE]) +{ + struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile); + struct ufs_qcom_host *host = ufshcd_get_variant(hba); + + return qcom_ice_derive_sw_secret(host->ice, eph_key, eph_key_size, + sw_secret); +} + +static int ufs_qcom_ice_import_key(struct blk_crypto_profile *profile, + const u8 *raw_key, size_t raw_key_size, + u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]) +{ + struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile); + struct ufs_qcom_host *host = ufshcd_get_variant(hba); + + return qcom_ice_import_key(host->ice, raw_key, raw_key_size, lt_key); +} + +static int ufs_qcom_ice_generate_key(struct blk_crypto_profile *profile, + u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]) +{ + struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile); + struct ufs_qcom_host *host = ufshcd_get_variant(hba); + + return qcom_ice_generate_key(host->ice, lt_key); +} + +static int ufs_qcom_ice_prepare_key(struct blk_crypto_profile *profile, + const u8 *lt_key, size_t lt_key_size, + u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]) +{ + struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile); + struct ufs_qcom_host *host = ufshcd_get_variant(hba); + + return qcom_ice_prepare_key(host->ice, lt_key, lt_key_size, eph_key); +} + static const struct blk_crypto_ll_ops ufs_qcom_crypto_ops = { .keyslot_program = ufs_qcom_ice_keyslot_program, .keyslot_evict = ufs_qcom_ice_keyslot_evict, + .derive_sw_secret = ufs_qcom_ice_derive_sw_secret, + .import_key = ufs_qcom_ice_import_key, + .generate_key = ufs_qcom_ice_generate_key, + .prepare_key = ufs_qcom_ice_prepare_key, }; #else static inline void ufs_qcom_ice_enable(struct ufs_qcom_host *host) -- 2.47.1
