[PATCH v12 1/4] soc: qcom: ice: make qcom_ice_program_key() take struct blk_crypto_key

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

qcom_ice_program_key() currently accepts the key as an array of bytes,
algorithm ID, key size enum, and data unit size.  However both callers
have a struct blk_crypto_key which contains all that information.  Thus
they both have similar code that converts the blk_crypto_key into the
form that qcom_ice_program_key() wants.  Once wrapped key support is
added, the key type would need to be added to the arguments too.

Therefore, this patch changes qcom_ice_program_key() to take in all this
information as a struct blk_crypto_key directly.  The calling code is
updated accordingly.  This ends up being much simpler, and it makes the
key type be passed down automatically once wrapped key support is added.

Based on a patch by Gaurav Kashyap <quic_gaurkash@quicinc.com> that
replaced the byte array argument only.  This patch makes the
blk_crypto_key replace other arguments like the algorithm ID too,
ensuring that there remains only one source of truth.

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Tested-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> # sm8650
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 drivers/mmc/host/sdhci-msm.c | 11 +----------
 drivers/soc/qcom/ice.c       | 23 ++++++++++++-----------
 drivers/ufs/host/ufs-qcom.c  | 11 +----------
 include/soc/qcom/ice.h       | 22 +++-------------------
 4 files changed, 17 insertions(+), 50 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 3c383bce4928..2c926f566d05 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -1960,20 +1960,11 @@ static int sdhci_msm_ice_keyslot_program(struct blk_crypto_profile *profile,
 					 unsigned int slot)
 {
 	struct sdhci_msm_host *msm_host =
 		sdhci_msm_host_from_crypto_profile(profile);
 
-	/* Only AES-256-XTS has been tested so far. */
-	if (key->crypto_cfg.crypto_mode != BLK_ENCRYPTION_MODE_AES_256_XTS)
-		return -EOPNOTSUPP;
-
-	return qcom_ice_program_key(msm_host->ice,
-				    QCOM_ICE_CRYPTO_ALG_AES_XTS,
-				    QCOM_ICE_CRYPTO_KEY_SIZE_256,
-				    key->bytes,
-				    key->crypto_cfg.data_unit_size / 512,
-				    slot);
+	return qcom_ice_program_key(msm_host->ice, slot, key);
 }
 
 static int sdhci_msm_ice_keyslot_evict(struct blk_crypto_profile *profile,
 				       const struct blk_crypto_key *key,
 				       unsigned int slot)
diff --git a/drivers/soc/qcom/ice.c b/drivers/soc/qcom/ice.c
index 393d2d1d275f..78780fd508f0 100644
--- a/drivers/soc/qcom/ice.c
+++ b/drivers/soc/qcom/ice.c
@@ -159,41 +159,42 @@ int qcom_ice_suspend(struct qcom_ice *ice)
 
 	return 0;
 }
 EXPORT_SYMBOL_GPL(qcom_ice_suspend);
 
-int qcom_ice_program_key(struct qcom_ice *ice,
-			 u8 algorithm_id, u8 key_size,
-			 const u8 crypto_key[], u8 data_unit_size,
-			 int slot)
+int qcom_ice_program_key(struct qcom_ice *ice, unsigned int slot,
+			 const struct blk_crypto_key *blk_key)
 {
 	struct device *dev = ice->dev;
 	union {
 		u8 bytes[AES_256_XTS_KEY_SIZE];
 		u32 words[AES_256_XTS_KEY_SIZE / sizeof(u32)];
 	} key;
 	int i;
 	int err;
 
 	/* Only AES-256-XTS has been tested so far. */
-	if (algorithm_id != QCOM_ICE_CRYPTO_ALG_AES_XTS ||
-	    key_size != QCOM_ICE_CRYPTO_KEY_SIZE_256) {
-		dev_err_ratelimited(dev,
-				    "Unhandled crypto capability; algorithm_id=%d, key_size=%d\n",
-				    algorithm_id, key_size);
+	if (blk_key->crypto_cfg.crypto_mode !=
+	    BLK_ENCRYPTION_MODE_AES_256_XTS) {
+		dev_err_ratelimited(dev, "Unsupported crypto mode: %d\n",
+				    blk_key->crypto_cfg.crypto_mode);
 		return -EINVAL;
 	}
 
-	memcpy(key.bytes, crypto_key, AES_256_XTS_KEY_SIZE);
+	if (blk_key->size != AES_256_XTS_KEY_SIZE) {
+		dev_err_ratelimited(dev, "Incorrect key size\n");
+		return -EINVAL;
+	}
+	memcpy(key.bytes, blk_key->bytes, AES_256_XTS_KEY_SIZE);
 
 	/* The SCM call requires that the key words are encoded in big endian */
 	for (i = 0; i < ARRAY_SIZE(key.words); i++)
 		__cpu_to_be32s(&key.words[i]);
 
 	err = qcom_scm_ice_set_key(slot, key.bytes, AES_256_XTS_KEY_SIZE,
 				   QCOM_SCM_ICE_CIPHER_AES_256_XTS,
-				   data_unit_size);
+				   blk_key->crypto_cfg.data_unit_size / 512);
 
 	memzero_explicit(&key, sizeof(key));
 
 	return err;
 }
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index c3f0aa81ff98..9330022e98ee 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -193,21 +193,12 @@ static int ufs_qcom_ice_keyslot_program(struct blk_crypto_profile *profile,
 {
 	struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile);
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
 	int err;
 
-	/* Only AES-256-XTS has been tested so far. */
-	if (key->crypto_cfg.crypto_mode != BLK_ENCRYPTION_MODE_AES_256_XTS)
-		return -EOPNOTSUPP;
-
 	ufshcd_hold(hba);
-	err = qcom_ice_program_key(host->ice,
-				   QCOM_ICE_CRYPTO_ALG_AES_XTS,
-				   QCOM_ICE_CRYPTO_KEY_SIZE_256,
-				   key->bytes,
-				   key->crypto_cfg.data_unit_size / 512,
-				   slot);
+	err = qcom_ice_program_key(host->ice, slot, key);
 	ufshcd_release(hba);
 	return err;
 }
 
 static int ufs_qcom_ice_keyslot_evict(struct blk_crypto_profile *profile,
diff --git a/include/soc/qcom/ice.h b/include/soc/qcom/ice.h
index 5870a94599a2..4cecc7f088b4 100644
--- a/include/soc/qcom/ice.h
+++ b/include/soc/qcom/ice.h
@@ -4,34 +4,18 @@
  */
 
 #ifndef __QCOM_ICE_H__
 #define __QCOM_ICE_H__
 
+#include <linux/blk-crypto.h>
 #include <linux/types.h>
 
 struct qcom_ice;
 
-enum qcom_ice_crypto_key_size {
-	QCOM_ICE_CRYPTO_KEY_SIZE_INVALID	= 0x0,
-	QCOM_ICE_CRYPTO_KEY_SIZE_128		= 0x1,
-	QCOM_ICE_CRYPTO_KEY_SIZE_192		= 0x2,
-	QCOM_ICE_CRYPTO_KEY_SIZE_256		= 0x3,
-	QCOM_ICE_CRYPTO_KEY_SIZE_512		= 0x4,
-};
-
-enum qcom_ice_crypto_alg {
-	QCOM_ICE_CRYPTO_ALG_AES_XTS		= 0x0,
-	QCOM_ICE_CRYPTO_ALG_BITLOCKER_AES_CBC	= 0x1,
-	QCOM_ICE_CRYPTO_ALG_AES_ECB		= 0x2,
-	QCOM_ICE_CRYPTO_ALG_ESSIV_AES_CBC	= 0x3,
-};
-
 int qcom_ice_enable(struct qcom_ice *ice);
 int qcom_ice_resume(struct qcom_ice *ice);
 int qcom_ice_suspend(struct qcom_ice *ice);
-int qcom_ice_program_key(struct qcom_ice *ice,
-			 u8 algorithm_id, u8 key_size,
-			 const u8 crypto_key[], u8 data_unit_size,
-			 int slot);
+int qcom_ice_program_key(struct qcom_ice *ice, unsigned int slot,
+			 const struct blk_crypto_key *blk_key);
 int qcom_ice_evict_key(struct qcom_ice *ice, int slot);
 struct qcom_ice *of_qcom_ice_get(struct device *dev);
 #endif /* __QCOM_ICE_H__ */
-- 
2.48.1