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Message-Id: <20241011-wrapped-keys-v7-17-e3f7a752059b@linaro.org>
Date: Fri, 11 Oct 2024 20:54:16 +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>, 
 Om Prakash Singh <quic_omprsing@...cinc.com>
Subject: [PATCH v7 17/17] ufs: host: add support for generating, importing
 and preparing wrapped keys

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

Extend the UFS core ops to include callbacks for generating, importing
and prepating HW wrapped keys using the lower-level block crypto
operations and implement them for QCom UFS.

Reviewed-by: Om Prakash Singh <quic_omprsing@...cinc.com>
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/host/ufs-qcom.c | 34 ++++++++++++++++++++++++++++++++++
 include/ufs/ufshcd.h        | 11 +++++++++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 862e02bf8f64..180e13a44b36 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -195,10 +195,41 @@ static int ufs_qcom_ice_derive_sw_secret(struct ufs_hba *hba, const u8 wkey[],
 	return qcom_ice_derive_sw_secret(host->ice, wkey, wkey_size, sw_secret);
 }
 
+static int ufs_qcom_ice_generate_key(struct ufs_hba *hba,
+				     u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
+{
+	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 ufs_hba *hba,
+				    const u8 *lt_key, size_t lt_key_size,
+				    u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+
+	return qcom_ice_prepare_key(host->ice, lt_key, lt_key_size,
+				    eph_key);
+}
+
+static int ufs_qcom_ice_import_key(struct ufs_hba *hba,
+				   const u8 *imp_key, size_t imp_key_size,
+				   u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+
+	return qcom_ice_import_key(host->ice, imp_key, imp_key_size,
+				   lt_key);
+}
+
 #else
 
 #define ufs_qcom_ice_program_key NULL
 #define ufs_qcom_ice_derive_sw_secret NULL
+#define ufs_qcom_ice_generate_key NULL
+#define ufs_qcom_ice_prepare_key NULL
+#define ufs_qcom_ice_import_key NULL
 
 static inline void ufs_qcom_ice_enable(struct ufs_qcom_host *host)
 {
@@ -1847,6 +1878,9 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
 	.config_scaling_param = ufs_qcom_config_scaling_param,
 	.program_key		= ufs_qcom_ice_program_key,
 	.derive_sw_secret	= ufs_qcom_ice_derive_sw_secret,
+	.generate_key		= ufs_qcom_ice_generate_key,
+	.prepare_key		= ufs_qcom_ice_prepare_key,
+	.import_key		= ufs_qcom_ice_import_key,
 	.reinit_notify		= ufs_qcom_reinit_notify,
 	.mcq_config_resource	= ufs_qcom_mcq_config_resource,
 	.get_hba_mac		= ufs_qcom_get_hba_mac,
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index c172c1dd9209..c52acb486688 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -324,6 +324,9 @@ struct ufs_pwr_mode_info {
  * @config_scaling_param: called to configure clock scaling parameters
  * @program_key: program or evict an inline encryption key
  * @derive_sw_secret: derive sw secret from a wrapped key
+ * @generate_key: generate a storage key and return longterm wrapped key
+ * @prepare_key: unwrap longterm key and return ephemeral wrapped key
+ * @import_key: import sw storage key and return longterm wrapped key
  * @fill_crypto_prdt: initialize crypto-related fields in the PRDT
  * @event_notify: called to notify important events
  * @reinit_notify: called to notify reinit of UFSHCD during max gear switch
@@ -376,6 +379,14 @@ struct ufs_hba_variant_ops {
 	int	(*derive_sw_secret)(struct ufs_hba *hba, const u8 wkey[],
 				    unsigned int wkey_size,
 				    u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE]);
+	int	(*generate_key)(struct ufs_hba *hba,
+				u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
+	int	(*prepare_key)(struct ufs_hba *hba,
+			       const u8 *lt_key, size_t lt_key_size,
+			       u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
+	int	(*import_key)(struct ufs_hba *hba,
+			      const u8 *imp_key, size_t imp_key_size,
+			      u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
 	int	(*fill_crypto_prdt)(struct ufs_hba *hba,
 				    const struct bio_crypt_ctx *crypt_ctx,
 				    void *prdt, unsigned int num_segments);

-- 
2.43.0


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