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scsi: firmware: qcom_scm: Add support for programming inline crypto keys

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Add support for the Inline Crypto Engine (ICE) key programming interface
that's needed for the ufs-qcom driver to use inline encryption on
Snapdragon SoCs.  This interface consists of two SCM calls: one to program
a key into a keyslot, and one to invalidate a keyslot.

Although the UFS specification defines a standard way to do this, on these
SoCs the Linux kernel isn't permitted to access the needed crypto
configuration registers directly; these SCM calls must be used instead.

Link: https://lore.kernel.org/r/20200710072013.177481-2-ebiggers@kernel.org
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Eric Biggers
2020-07-10 00:20:08 -07:00
committed by Martin K. Petersen
parent 3eef38a143
commit 0f20651474
3 changed files with 124 additions and 0 deletions
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19
include/linux/qcom_scm.h
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@@ -44,6 +44,13 @@ enum qcom_scm_sec_dev_id {
QCOM_SCM_ICE_DEV_ID = 20,
};
enum qcom_scm_ice_cipher {
QCOM_SCM_ICE_CIPHER_AES_128_XTS = 0,
QCOM_SCM_ICE_CIPHER_AES_128_CBC = 1,
QCOM_SCM_ICE_CIPHER_AES_256_XTS = 3,
QCOM_SCM_ICE_CIPHER_AES_256_CBC = 4,
};
#define QCOM_SCM_VMID_HLOS 0x3
#define QCOM_SCM_VMID_MSS_MSA 0xF
#define QCOM_SCM_VMID_WLAN 0x18
@@ -88,6 +95,12 @@ extern int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset,
extern int qcom_scm_ocmem_unlock(enum qcom_scm_ocmem_client id, u32 offset,
u32 size);
extern bool qcom_scm_ice_available(void);
extern int qcom_scm_ice_invalidate_key(u32 index);
extern int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size,
enum qcom_scm_ice_cipher cipher,
u32 data_unit_size);
extern bool qcom_scm_hdcp_available(void);
extern int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
u32 *resp);
@@ -138,6 +151,12 @@ static inline int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset,
static inline int qcom_scm_ocmem_unlock(enum qcom_scm_ocmem_client id,
u32 offset, u32 size) { return -ENODEV; }
static inline bool qcom_scm_ice_available(void) { return false; }
static inline int qcom_scm_ice_invalidate_key(u32 index) { return -ENODEV; }
static inline int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size,
enum qcom_scm_ice_cipher cipher,
u32 data_unit_size) { return -ENODEV; }
static inline bool qcom_scm_hdcp_available(void) { return false; }
static inline int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
u32 *resp) { return -ENODEV; }