crypto-qti: qcedev: add support for hlos offload path

Add support for HLOS offload data path in the qcedev driver
mainly to support DRM and HDCP usecases.

Changes extend the current driver to support the following.
- Register multiple pipes for different offload usecases.
- Report timer expiry errors back to userspace.
- Support different iv CTR sizes based on userspace input.
- Support new IOCTLS to support encryption, decryption and
  copy offload usecases for DRM and HDCP.

Change-Id: Ie9b74c173d0afd7b8c863ed57a68ec6e74baa9b4

linux/qcedev.h

@@ -41,6 +41,31 @@ enum qcedev_oper_enum {
 	QCEDEV_OPER_LAST
 };
 
+/**
+ *qcedev_offload_oper_enum: Offload operation types (uses pipe keys)
+ * @QCEDEV_OFFLOAD_HLOS_HLOS:   Non-secure to non-secure (eg. audio dec).
+ * @QCEDEV_OFFLOAD_HLOS_CPB:    Non-secure to secure (eg. video dec).
+ * @QCEDEV_OFFLOAD_CPB_HLOS:    Secure to non-secure (eg. hdcp video enc).
+ */
+enum qcedev_offload_oper_enum {
+	QCEDEV_OFFLOAD_HLOS_HLOS = 1,
+	QCEDEV_OFFLOAD_HLOS_CPB = 2,
+	QCEDEV_OFFLOAD_CPB_HLOS = 3,
+	QCEDEV_OFFLOAD_OPER_LAST
+};
+
+/**
+ *qcedev_offload_err_enum: Offload error conditions
+ * @QCEDEV_OFFLOAD_NO_ERROR:        Successful crypto operation.
+ * @QCEDEV_OFFLOAD_GENERIC_ERROR:   Generic error in crypto status.
+ * @QCEDEV_OFFLOAD_TIMER_ERROR:     Pipe key timer errors in crypto status.
+ */
+enum qcedev_offload_err_enum {
+	QCEDEV_OFFLOAD_NO_ERROR = 0,
+	QCEDEV_OFFLOAD_GENERIC_ERROR = 1,
+	QCEDEV_OFFLOAD_TIMER_ERROR = 2
+};
+
 /**
  *qcedev_oper_enum: Cipher algorithm types
  * @QCEDEV_ALG_DES:		DES
@@ -223,6 +248,72 @@ struct	qcedev_sha_op_req {
 	enum qcedev_sha_alg_enum	alg;
 };
 
+/**
+ * struct pattern_info - Holds pattern information for pattern-based
+ * decryption/encryption for AES ECB, counter, and CBC modes.
+ * @patt_sz (IN):       Total number of blocks.
+ * @proc_data_sz (IN):  Number of blocks to be processed.
+ * @patt_offset (IN):   Start of the segment.
+ */
+struct pattern_info {
+	__u8 patt_sz;
+	__u8 proc_data_sz;
+	__u8 patt_offset;
+};
+
+/**
+ * struct qcedev_offload_cipher_op_req - Holds the offload request information
+ * @vbuf (IN/OUT):      Stores Source and destination Buffer information.
+ *                      Refer to struct qcedev_vbuf_info.
+ * @entries (IN):       Number of entries to be processed as part of request.
+ * @data_len (IN):      Total Length of input/src and output/dst in bytes
+ * @in_place_op (IN):   Indicates whether the operation is inplace where
+ *                      source == destination.
+ * @encklen (IN):       Length of the encryption key(set to 128  bits/16
+ *                      bytes in the driver).
+ * @iv (IN/OUT):        Initialisation vector data
+ *                      This is updated by the driver, incremented by
+ *                      number of blocks encrypted/decrypted.
+ * @ivlen (IN):         Length of the IV.
+ * @iv_ctr_size (IN):   IV counter increment mask size.
+ *                      Driver sets the mask value based on this size.
+ * @byteoffset (IN):    Offset in the Cipher BLOCK (applicable and to be set
+ *                      for AES-128 CTR mode only).
+ * @block_offset (IN):  Offset in the block that needs a skip of encrypt/
+ *                      decrypt.
+ * @pattern_valid (IN): Indicates the request contains a valid pattern.
+ * @pattern_info (IN):  The pattern to be used for the offload request.
+ * @is_copy_op (IN):    Offload operations sometimes requires a copy between
+ *                      secure and non-secure buffers without any encrypt/
+ *                      decrypt operations.
+ * @alg (IN):           Type of ciphering algorithm: AES/DES/3DES.
+ * @mode (IN):          Mode use when using AES algorithm: ECB/CBC/CTR.
+ *                      Applicable when using AES algorithm only.
+ * @op (IN):            Type of operation.
+ *                      Refer to qcedev_offload_oper_enum.
+ * @err (OUT):          Error in crypto status.
+ *                      Refer to qcedev_offload_err_enum.
+ */
+struct qcedev_offload_cipher_op_req {
+	struct qcedev_vbuf_info vbuf;
+	__u32 entries;
+	__u32 data_len;
+	__u32 in_place_op;
+	__u32 encklen;
+	__u8 iv[QCEDEV_MAX_IV_SIZE];
+	__u32 ivlen;
+	__u32 iv_ctr_size;
+	__u32 byteoffset;
+	__u8 block_offset;
+	__u8 is_pattern_valid;
+	__u8 is_copy_op;
+	struct pattern_info pattern_info;
+	enum qcedev_cipher_alg_enum alg;
+	enum qcedev_cipher_mode_enum mode;
+	enum qcedev_offload_oper_enum op;
+	enum qcedev_offload_err_enum err;
+};
+
 /**
  * struct qfips_verify_t - Holds data for FIPS Integrity test
  * @kernel_size  (IN):		Size of kernel Image
@@ -286,4 +377,6 @@ struct file;
 	_IOWR(QCEDEV_IOC_MAGIC, 10, struct qcedev_map_buf_req)
 #define QCEDEV_IOCTL_UNMAP_BUF_REQ	\
 	_IOWR(QCEDEV_IOC_MAGIC, 11, struct qcedev_unmap_buf_req)
+#define QCEDEV_IOCTL_OFFLOAD_OP_REQ		\
+	_IOWR(QCEDEV_IOC_MAGIC, 12, struct qcedev_offload_cipher_op_req)
 #endif /* _QCEDEV__H */