linux-kernel - [PATCH v6 12/17] ufs: core: add support for wrapped keys to UFS core

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Message-Id: <20240906-wrapped-keys-v6-12-d59e61bc0cb4@linaro.org>
Date: Fri, 06 Sep 2024 20:07:15 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>, 
 Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>, 
 Mikulas Patocka <mpatocka@...hat.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, 
 Asutosh Das <quic_asutoshd@...cinc.com>, 
 Ritesh Harjani <ritesh.list@...il.com>, 
 Ulf Hansson <ulf.hansson@...aro.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Avri Altman <avri.altman@....com>, Bart Van Assche <bvanassche@....org>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Eric Biggers <ebiggers@...nel.org>, "Theodore Y. Ts'o" <tytso@....edu>, 
 Jaegeuk Kim <jaegeuk@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Gaurav Kashyap <quic_gaurkash@...cinc.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-block@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, dm-devel@...ts.linux.dev, 
 linux-mmc@...r.kernel.org, linux-scsi@...r.kernel.org, 
 linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v6 12/17] ufs: core: add support for wrapped keys to UFS
 core

From: Gaurav Kashyap <quic_gaurkash@...cinc.com>

Add a new UFS capability flag indicating that the controller supports HW
wrapped keys and use it to determine which mechanism to use in UFS core.

Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
Signed-off-by: Gaurav Kashyap <quic_gaurkash@...cinc.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/ufs/core/ufshcd-crypto.c | 24 ++++++++++++++++--------
 include/ufs/ufshcd.h             |  5 +++++
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/ufs/core/ufshcd-crypto.c b/drivers/ufs/core/ufshcd-crypto.c
index 33083e0cad6e..64389e876910 100644
--- a/drivers/ufs/core/ufshcd-crypto.c
+++ b/drivers/ufs/core/ufshcd-crypto.c
@@ -81,13 +81,15 @@ static int ufshcd_crypto_keyslot_program(struct blk_crypto_profile *profile,
 	cfg.crypto_cap_idx = cap_idx;
 	cfg.config_enable = UFS_CRYPTO_CONFIGURATION_ENABLE;

-	if (ccap_array[cap_idx].algorithm_id == UFS_CRYPTO_ALG_AES_XTS) {
-		/* In XTS mode, the blk_crypto_key's size is already doubled */
-		memcpy(cfg.crypto_key, key->raw, key->size/2);
-		memcpy(cfg.crypto_key + UFS_CRYPTO_KEY_MAX_SIZE/2,
-		       key->raw + key->size/2, key->size/2);
-	} else {
-		memcpy(cfg.crypto_key, key->raw, key->size);
+	if (key->crypto_cfg.key_type != BLK_CRYPTO_KEY_TYPE_HW_WRAPPED) {
+		if (ccap_array[cap_idx].algorithm_id == UFS_CRYPTO_ALG_AES_XTS) {
+			/* In XTS mode, the blk_crypto_key's size is already doubled */
+			memcpy(cfg.crypto_key, key->raw, key->size / 2);
+			memcpy(cfg.crypto_key + UFS_CRYPTO_KEY_MAX_SIZE / 2,
+			       key->raw + key->size / 2, key->size / 2);
+		} else {
+			memcpy(cfg.crypto_key, key->raw, key->size);
+		}
 	}

 	err = ufshcd_program_key(hba, key, &cfg, slot);
@@ -196,7 +198,13 @@ int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba)
 	hba->crypto_profile.ll_ops = ufshcd_crypto_ops;
 	/* UFS only supports 8 bytes for any DUN */
 	hba->crypto_profile.max_dun_bytes_supported = 8;
-	hba->crypto_profile.key_types_supported = BLK_CRYPTO_KEY_TYPE_STANDARD;
+	if (hba->caps & UFSHCD_CAP_WRAPPED_CRYPTO_KEYS)
+		hba->crypto_profile.key_types_supported =
+				BLK_CRYPTO_KEY_TYPE_HW_WRAPPED;
+	else
+		hba->crypto_profile.key_types_supported =
+				BLK_CRYPTO_KEY_TYPE_STANDARD;
+
 	hba->crypto_profile.dev = hba->dev;

 	/*
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 0beb010bb8da..a2dad4f982c2 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -763,6 +763,11 @@ enum ufshcd_caps {
 	 * WriteBooster when scaling the clock down.
 	 */
 	UFSHCD_CAP_WB_WITH_CLK_SCALING			= 1 << 12,
+
+	/*
+	 * UFS controller supports HW wrapped keys when using inline encryption.
+	 */
+	UFSHCD_CAP_WRAPPED_CRYPTO_KEYS			= 1 << 13,
 };

 struct ufs_hba_variant_params {

-- 
2.43.0