crypto: caam - export ahash shared descriptor generation

caam/qi2 driver will support ahash algorithms,
thus move ahash descriptors generation in a shared location.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/Kconfig

@@ -172,3 +172,6 @@ config CRYPTO_DEV_FSL_CAAM_CRYPTO_API_DESC
 	def_tristate (CRYPTO_DEV_FSL_CAAM_CRYPTO_API || \
 		      CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI || \
 		      CRYPTO_DEV_FSL_DPAA2_CAAM)
+
+config CRYPTO_DEV_FSL_CAAM_AHASH_API_DESC
+	def_tristate (CRYPTO_DEV_FSL_CAAM_AHASH_API)

drivers/crypto/caam/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API) += caamalg.o
 obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI) += caamalg_qi.o
 obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_DESC) += caamalg_desc.o
 obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_AHASH_API) += caamhash.o
+obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_AHASH_API_DESC) += caamhash_desc.o
 obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_API) += caamrng.o
 obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PKC_API) += caam_pkc.o
 

drivers/crypto/caam/caamhash.c

@@ -62,6 +62,7 @@
 #include "error.h"
 #include "sg_sw_sec4.h"
 #include "key_gen.h"
+#include "caamhash_desc.h"
 
 #define CAAM_CRA_PRIORITY		3000
 
@@ -71,14 +72,6 @@
 #define CAAM_MAX_HASH_BLOCK_SIZE	SHA512_BLOCK_SIZE
 #define CAAM_MAX_HASH_DIGEST_SIZE	SHA512_DIGEST_SIZE
 
-/* length of descriptors text */
-#define DESC_AHASH_BASE			(3 * CAAM_CMD_SZ)
-#define DESC_AHASH_UPDATE_LEN		(6 * CAAM_CMD_SZ)
-#define DESC_AHASH_UPDATE_FIRST_LEN	(DESC_AHASH_BASE + 4 * CAAM_CMD_SZ)
-#define DESC_AHASH_FINAL_LEN		(DESC_AHASH_BASE + 5 * CAAM_CMD_SZ)
-#define DESC_AHASH_FINUP_LEN		(DESC_AHASH_BASE + 5 * CAAM_CMD_SZ)
-#define DESC_AHASH_DIGEST_LEN		(DESC_AHASH_BASE + 4 * CAAM_CMD_SZ)
-
 #define DESC_HASH_MAX_USED_BYTES	(DESC_AHASH_FINAL_LEN + \
 					 CAAM_MAX_HASH_KEY_SIZE)
 #define DESC_HASH_MAX_USED_LEN		(DESC_HASH_MAX_USED_BYTES / CAAM_CMD_SZ)
@@ -235,60 +228,6 @@ static inline int ctx_map_to_sec4_sg(struct device *jrdev,
 	return 0;
 }
 
-/*
- * For ahash update, final and finup (import_ctx = true)
- *     import context, read and write to seqout
- * For ahash firsts and digest (import_ctx = false)
- *     read and write to seqout
- */
-static inline void ahash_gen_sh_desc(u32 *desc, u32 state, int digestsize,
-				     struct caam_hash_ctx *ctx, bool import_ctx,
-				     int era)
-{
-	u32 op = ctx->adata.algtype;
-	u32 *skip_key_load;
-
-	init_sh_desc(desc, HDR_SHARE_SERIAL);
-
-	/* Append key if it has been set; ahash update excluded */
-	if ((state != OP_ALG_AS_UPDATE) && (ctx->adata.keylen)) {
-		/* Skip key loading if already shared */
-		skip_key_load = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
-					    JUMP_COND_SHRD);
-
-		if (era < 6)
-			append_key_as_imm(desc, ctx->key, ctx->adata.keylen_pad,
-					  ctx->adata.keylen, CLASS_2 |
-					  KEY_DEST_MDHA_SPLIT | KEY_ENC);
-		else
-			append_proto_dkp(desc, &ctx->adata);
-
-		set_jump_tgt_here(desc, skip_key_load);
-
-		op |= OP_ALG_AAI_HMAC_PRECOMP;
-	}
-
-	/* If needed, import context from software */
-	if (import_ctx)
-		append_seq_load(desc, ctx->ctx_len, LDST_CLASS_2_CCB |
-				LDST_SRCDST_BYTE_CONTEXT);
-
-	/* Class 2 operation */
-	append_operation(desc, op | state | OP_ALG_ENCRYPT);
-
-	/*
-	 * Load from buf and/or src and write to req->result or state->context
-	 * Calculate remaining bytes to read
-	 */
-	append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
-	/* Read remaining bytes */
-	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_LAST2 |
-			     FIFOLD_TYPE_MSG | KEY_VLF);
-	/* Store class2 context bytes */
-	append_seq_store(desc, digestsize, LDST_CLASS_2_CCB |
-			 LDST_SRCDST_BYTE_CONTEXT);
-}
-
 static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 {
 	struct caam_hash_ctx *ctx = crypto_ahash_ctx(ahash);
@@ -301,8 +240,8 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 
 	/* ahash_update shared descriptor */
 	desc = ctx->sh_desc_update;
-	ahash_gen_sh_desc(desc, OP_ALG_AS_UPDATE, ctx->ctx_len, ctx, true,
-			  ctrlpriv->era);
+	cnstr_shdsc_ahash(desc, &ctx->adata, OP_ALG_AS_UPDATE, ctx->ctx_len,
+			  ctx->ctx_len, true, ctrlpriv->era);
 	dma_sync_single_for_device(jrdev, ctx->sh_desc_update_dma,
 				   desc_bytes(desc), ctx->dir);
 #ifdef DEBUG
@@ -313,8 +252,8 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 
 	/* ahash_update_first shared descriptor */
 	desc = ctx->sh_desc_update_first;
-	ahash_gen_sh_desc(desc, OP_ALG_AS_INIT, ctx->ctx_len, ctx, false,
-			  ctrlpriv->era);
+	cnstr_shdsc_ahash(desc, &ctx->adata, OP_ALG_AS_INIT, ctx->ctx_len,
+			  ctx->ctx_len, false, ctrlpriv->era);
 	dma_sync_single_for_device(jrdev, ctx->sh_desc_update_first_dma,
 				   desc_bytes(desc), ctx->dir);
 #ifdef DEBUG
@@ -325,8 +264,8 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 
 	/* ahash_final shared descriptor */
 	desc = ctx->sh_desc_fin;
-	ahash_gen_sh_desc(desc, OP_ALG_AS_FINALIZE, digestsize, ctx, true,
-			  ctrlpriv->era);
+	cnstr_shdsc_ahash(desc, &ctx->adata, OP_ALG_AS_FINALIZE, digestsize,
+			  ctx->ctx_len, true, ctrlpriv->era);
 	dma_sync_single_for_device(jrdev, ctx->sh_desc_fin_dma,
 				   desc_bytes(desc), ctx->dir);
 #ifdef DEBUG
@@ -337,8 +276,8 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 
 	/* ahash_digest shared descriptor */
 	desc = ctx->sh_desc_digest;
-	ahash_gen_sh_desc(desc, OP_ALG_AS_INITFINAL, digestsize, ctx, false,
-			  ctrlpriv->era);
+	cnstr_shdsc_ahash(desc, &ctx->adata, OP_ALG_AS_INITFINAL, digestsize,
+			  ctx->ctx_len, false, ctrlpriv->era);
 	dma_sync_single_for_device(jrdev, ctx->sh_desc_digest_dma,
 				   desc_bytes(desc), ctx->dir);
 #ifdef DEBUG

drivers/crypto/caam/caamhash_desc.c

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Shared descriptors for ahash algorithms
+ *
+ * Copyright 2017 NXP
+ */
+
+#include "compat.h"
+#include "desc_constr.h"
+#include "caamhash_desc.h"
+
+/**
+ * cnstr_shdsc_ahash - ahash shared descriptor
+ * @desc: pointer to buffer used for descriptor construction
+ * @adata: pointer to authentication transform definitions.
+ *         A split key is required for SEC Era < 6; the size of the split key
+ *         is specified in this case.
+ *         Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1, SHA224,
+ *         SHA256, SHA384, SHA512}.
+ * @state: algorithm state OP_ALG_AS_{INIT, FINALIZE, INITFINALIZE, UPDATE}
+ * @digestsize: algorithm's digest size
+ * @ctx_len: size of Context Register
+ * @import_ctx: true if previous Context Register needs to be restored
+ *              must be true for ahash update and final
+ *              must be false for for ahash first and digest
+ * @era: SEC Era
+ */
+void cnstr_shdsc_ahash(u32 * const desc, struct alginfo *adata, u32 state,
+		       int digestsize, int ctx_len, bool import_ctx, int era)
+{
+	u32 op = adata->algtype;
+
+	init_sh_desc(desc, HDR_SHARE_SERIAL);
+
+	/* Append key if it has been set; ahash update excluded */
+	if (state != OP_ALG_AS_UPDATE && adata->keylen) {
+		u32 *skip_key_load;
+
+		/* Skip key loading if already shared */
+		skip_key_load = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
+					    JUMP_COND_SHRD);
+
+		if (era < 6)
+			append_key_as_imm(desc, adata->key_virt,
+					  adata->keylen_pad,
+					  adata->keylen, CLASS_2 |
+					  KEY_DEST_MDHA_SPLIT | KEY_ENC);
+		else
+			append_proto_dkp(desc, adata);
+
+		set_jump_tgt_here(desc, skip_key_load);
+
+		op |= OP_ALG_AAI_HMAC_PRECOMP;
+	}
+
+	/* If needed, import context from software */
+	if (import_ctx)
+		append_seq_load(desc, ctx_len, LDST_CLASS_2_CCB |
+				LDST_SRCDST_BYTE_CONTEXT);
+
+	/* Class 2 operation */
+	append_operation(desc, op | state | OP_ALG_ENCRYPT);
+
+	/*
+	 * Load from buf and/or src and write to req->result or state->context
+	 * Calculate remaining bytes to read
+	 */
+	append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
+	/* Read remaining bytes */
+	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_LAST2 |
+			     FIFOLD_TYPE_MSG | KEY_VLF);
+	/* Store class2 context bytes */
+	append_seq_store(desc, digestsize, LDST_CLASS_2_CCB |
+			 LDST_SRCDST_BYTE_CONTEXT);
+}
+EXPORT_SYMBOL(cnstr_shdsc_ahash);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("FSL CAAM ahash descriptors support");
+MODULE_AUTHOR("NXP Semiconductors");

drivers/crypto/caam/caamhash_desc.h

@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
+/*
+ * Shared descriptors for ahash algorithms
+ *
+ * Copyright 2017 NXP
+ */
+
+#ifndef _CAAMHASH_DESC_H_
+#define _CAAMHASH_DESC_H_
+
+/* length of descriptors text */
+#define DESC_AHASH_BASE			(3 * CAAM_CMD_SZ)
+#define DESC_AHASH_UPDATE_LEN		(6 * CAAM_CMD_SZ)
+#define DESC_AHASH_UPDATE_FIRST_LEN	(DESC_AHASH_BASE + 4 * CAAM_CMD_SZ)
+#define DESC_AHASH_FINAL_LEN		(DESC_AHASH_BASE + 5 * CAAM_CMD_SZ)
+#define DESC_AHASH_DIGEST_LEN		(DESC_AHASH_BASE + 4 * CAAM_CMD_SZ)
+
+void cnstr_shdsc_ahash(u32 * const desc, struct alginfo *adata, u32 state,
+		       int digestsize, int ctx_len, bool import_ctx, int era);
+
+#endif /* _CAAMHASH_DESC_H_ */