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Message-Id: <20240906-wrapped-keys-v6-17-d59e61bc0cb4@linaro.org>
Date: Fri, 06 Sep 2024 20:07:20 +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 v6 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 77fb5e66e4be..fd8952473f4b 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)
{
@@ -1830,6 +1861,9 @@ 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 b8b1763df022..a94b3d872bcc 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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