From: Gaurav Kashyap <quic_gaurkash@xxxxxxxxxxx>
Add a new UFS core callback for deriving software secrets from hardware
wrapped keys and implement it in QCom UFS.
Tested-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Signed-off-by: Gaurav Kashyap <quic_gaurkash@xxxxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
drivers/ufs/host/ufs-qcom.c | 15 +++++++++++++++
include/ufs/ufshcd.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 880df3a8955a..862e02bf8f64 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -182,9 +182,23 @@ static int ufs_qcom_ice_program_key(struct ufs_hba *hba,
return qcom_ice_evict_key(host->ice, slot);
}
+/*
+ * Derive a software secret from a hardware wrapped key. The key is unwrapped in
+ * hardware from trustzone and a software key/secret is then derived from it.
+ */
+static int ufs_qcom_ice_derive_sw_secret(struct ufs_hba *hba, const u8 wkey[],
+ unsigned int wkey_size,
+ u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE])
+{
+ struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+
+ return qcom_ice_derive_sw_secret(host->ice, wkey, wkey_size, sw_secret);
+}
+
#else
#define ufs_qcom_ice_program_key NULL
+#define ufs_qcom_ice_derive_sw_secret NULL
static inline void ufs_qcom_ice_enable(struct ufs_qcom_host *host)
{
@@ -1832,6 +1846,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
.device_reset = ufs_qcom_device_reset,
.config_scaling_param = ufs_qcom_config_scaling_param,
.program_key = ufs_qcom_ice_program_key,
+ .derive_sw_secret = ufs_qcom_ice_derive_sw_secret,
.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 d74a26a36f5b..c172c1dd9209 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -323,6 +323,7 @@ struct ufs_pwr_mode_info {
* @device_reset: called to issue a reset pulse on the UFS device
* @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
* @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
--
2.43.0
