crypto: ccp - Register the CCP as a DMA resource
The CCP has the ability to provide DMA services to the
kernel using pass-through mode of the device. Register
these services as general purpose DMA channels.
Changes since v2:
- Add a Signed-off-by
Changes since v1:
- Allocate memory for a string in ccp_dmaengine_register
- Ensure register/unregister calls are properly ordered
- Verified all changed files are listed in the diffstat
- Undo some superfluous changes
- Added a cc:
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/linux/ccp.h b/include/linux/ccp.h
index 915af30..7c2bb27 100644
--- a/include/linux/ccp.h
+++ b/include/linux/ccp.h
@@ -1,9 +1,10 @@
/*
* AMD Cryptographic Coprocessor (CCP) driver
*
- * Copyright (C) 2013 Advanced Micro Devices, Inc.
+ * Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
+ * Author: Gary R Hook <gary.hook@amd.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -381,6 +382,35 @@
u32 final;
};
+/**
+ * struct ccp_passthru_nomap_engine - CCP pass-through operation
+ * without performing DMA mapping
+ * @bit_mod: bitwise operation to perform
+ * @byte_swap: byteswap operation to perform
+ * @mask: mask to be applied to data
+ * @mask_len: length in bytes of mask
+ * @src: data to be used for this operation
+ * @dst: data produced by this operation
+ * @src_len: length in bytes of data used for this operation
+ * @final: indicate final pass-through operation
+ *
+ * Variables required to be set when calling ccp_enqueue_cmd():
+ * - bit_mod, byte_swap, src, dst, src_len
+ * - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
+ */
+struct ccp_passthru_nomap_engine {
+ enum ccp_passthru_bitwise bit_mod;
+ enum ccp_passthru_byteswap byte_swap;
+
+ dma_addr_t mask;
+ u32 mask_len; /* In bytes */
+
+ dma_addr_t src_dma, dst_dma;
+ u64 src_len; /* In bytes */
+
+ u32 final;
+};
+
/***** ECC engine *****/
#define CCP_ECC_MODULUS_BYTES 48 /* 384-bits */
#define CCP_ECC_MAX_OPERANDS 6
@@ -522,7 +552,8 @@
};
/* Flag values for flags member of ccp_cmd */
-#define CCP_CMD_MAY_BACKLOG 0x00000001
+#define CCP_CMD_MAY_BACKLOG 0x00000001
+#define CCP_CMD_PASSTHRU_NO_DMA_MAP 0x00000002
/**
* struct ccp_cmd - CPP operation request
@@ -562,6 +593,7 @@
struct ccp_sha_engine sha;
struct ccp_rsa_engine rsa;
struct ccp_passthru_engine passthru;
+ struct ccp_passthru_nomap_engine passthru_nomap;
struct ccp_ecc_engine ecc;
} u;