crypto: caam - refactor key_gen, sg

create separate files for split key generation and scatterlist functions.

Signed-off-by: Yuan Kang <Yuan.Kang@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/Makefile

@@ -5,4 +5,4 @@
 obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM) += caam.o
 obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API) += caamalg.o
 
-caam-objs := ctrl.o jr.o error.o
+caam-objs := ctrl.o jr.o error.o key_gen.o

drivers/crypto/caam/caamalg.c

@@ -51,6 +51,8 @@
 #include "desc_constr.h"
 #include "jr.h"
 #include "error.h"
+#include "sg_link_tbl.h"
+#include "key_gen.h"
 
 /*
  * crypto alg
@@ -453,121 +455,12 @@ static int aead_setauthsize(struct crypto_aead *authenc,
 	return 0;
 }
 
-struct split_key_result {
-	struct completion completion;
-	int err;
-};
-
-static void split_key_done(struct device *dev, u32 *desc, u32 err,
-			   void *context)
+static u32 gen_split_aead_key(struct caam_ctx *ctx, const u8 *key_in,
+			      u32 authkeylen)
 {
-	struct split_key_result *res = context;
-
-#ifdef DEBUG
-	dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
-#endif
-
-	if (err) {
-		char tmp[CAAM_ERROR_STR_MAX];
-
-		dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err));
-	}
-
-	res->err = err;
-
-	complete(&res->completion);
-}
-
-/*
-get a split ipad/opad key
-
-Split key generation-----------------------------------------------
-
-[00] 0xb0810008    jobdesc: stidx=1 share=never len=8
-[01] 0x04000014        key: class2->keyreg len=20
-			@0xffe01000
-[03] 0x84410014  operation: cls2-op sha1 hmac init dec
-[04] 0x24940000     fifold: class2 msgdata-last2 len=0 imm
-[05] 0xa4000001       jump: class2 local all ->1 [06]
-[06] 0x64260028    fifostr: class2 mdsplit-jdk len=40
-			@0xffe04000
-*/
-static u32 gen_split_key(struct caam_ctx *ctx, const u8 *key_in, u32 authkeylen)
-{
-	struct device *jrdev = ctx->jrdev;
-	u32 *desc;
-	struct split_key_result result;
-	dma_addr_t dma_addr_in, dma_addr_out;
-	int ret = 0;
-
-	desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
-
-	init_job_desc(desc, 0);
-
-	dma_addr_in = dma_map_single(jrdev, (void *)key_in, authkeylen,
-				     DMA_TO_DEVICE);
-	if (dma_mapping_error(jrdev, dma_addr_in)) {
-		dev_err(jrdev, "unable to map key input memory\n");
-		kfree(desc);
-		return -ENOMEM;
-	}
-	append_key(desc, dma_addr_in, authkeylen, CLASS_2 |
-		       KEY_DEST_CLASS_REG);
-
-	/* Sets MDHA up into an HMAC-INIT */
-	append_operation(desc, ctx->alg_op | OP_ALG_DECRYPT |
-			     OP_ALG_AS_INIT);
-
-	/*
-	 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
-	   into both pads inside MDHA
-	 */
-	append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
-				FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
-
-	/*
-	 * FIFO_STORE with the explicit split-key content store
-	 * (0x26 output type)
-	 */
-	dma_addr_out = dma_map_single(jrdev, ctx->key, ctx->split_key_pad_len,
-				      DMA_FROM_DEVICE);
-	if (dma_mapping_error(jrdev, dma_addr_out)) {
-		dev_err(jrdev, "unable to map key output memory\n");
-		kfree(desc);
-		return -ENOMEM;
-	}
-	append_fifo_store(desc, dma_addr_out, ctx->split_key_len,
-			  LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
-
-#ifdef DEBUG
-	print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
-		       DUMP_PREFIX_ADDRESS, 16, 4, key_in, authkeylen, 1);
-	print_hex_dump(KERN_ERR, "jobdesc@"xstr(__LINE__)": ",
-		       DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
-#endif
-
-	result.err = 0;
-	init_completion(&result.completion);
-
-	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
-	if (!ret) {
-		/* in progress */
-		wait_for_completion_interruptible(&result.completion);
-		ret = result.err;
-#ifdef DEBUG
-		print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
-			       DUMP_PREFIX_ADDRESS, 16, 4, ctx->key,
-			       ctx->split_key_pad_len, 1);
-#endif
-	}
-
-	dma_unmap_single(jrdev, dma_addr_out, ctx->split_key_pad_len,
-			 DMA_FROM_DEVICE);
-	dma_unmap_single(jrdev, dma_addr_in, authkeylen, DMA_TO_DEVICE);
-
-	kfree(desc);
-
-	return ret;
+	return gen_split_key(ctx->jrdev, ctx->key, ctx->split_key_len,
+			       ctx->split_key_pad_len, key_in, authkeylen,
+			       ctx->alg_op);
 }
 
 static int aead_setkey(struct crypto_aead *aead,
@@ -611,7 +504,7 @@ static int aead_setkey(struct crypto_aead *aead,
 		       DUMP_PREFIX_ADDRESS, 16, 4, key, keylen, 1);
 #endif
 
-	ret = gen_split_key(ctx, key, authkeylen);
+	ret = gen_split_aead_key(ctx, key, authkeylen);
 	if (ret) {
 		goto badkey;
 	}
@@ -758,14 +651,6 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
 	return ret;
 }
 
-struct link_tbl_entry {
-	u64 ptr;
-	u32 len;
-	u8 reserved;
-	u8 buf_pool_id;
-	u16 offset;
-};
-
 /*
  * aead_edesc - s/w-extended aead descriptor
  * @assoc_nents: number of segments in associated data (SPI+Seq) scatterlist
@@ -1027,50 +912,6 @@ static void ablkcipher_decrypt_done(struct device *jrdev, u32 *desc, u32 err,
 	ablkcipher_request_complete(req, err);
 }
 
-static void sg_to_link_tbl_one(struct link_tbl_entry *link_tbl_ptr,
-			       dma_addr_t dma, u32 len, u32 offset)
-{
-	link_tbl_ptr->ptr = dma;
-	link_tbl_ptr->len = len;
-	link_tbl_ptr->reserved = 0;
-	link_tbl_ptr->buf_pool_id = 0;
-	link_tbl_ptr->offset = offset;
-#ifdef DEBUG
-	print_hex_dump(KERN_ERR, "link_tbl_ptr@"xstr(__LINE__)": ",
-		       DUMP_PREFIX_ADDRESS, 16, 4, link_tbl_ptr,
-		       sizeof(struct link_tbl_entry), 1);
-#endif
-}
-
-/*
- * convert scatterlist to h/w link table format
- * but does not have final bit; instead, returns last entry
- */
-static struct link_tbl_entry *sg_to_link_tbl(struct scatterlist *sg,
-					     int sg_count, struct link_tbl_entry
-					     *link_tbl_ptr, u32 offset)
-{
-	while (sg_count) {
-		sg_to_link_tbl_one(link_tbl_ptr, sg_dma_address(sg),
-				   sg_dma_len(sg), offset);
-		link_tbl_ptr++;
-		sg = sg_next(sg);
-		sg_count--;
-	}
-	return link_tbl_ptr - 1;
-}
-
-/*
- * convert scatterlist to h/w link table format
- * scatterlist must have been previously dma mapped
- */
-static void sg_to_link_tbl_last(struct scatterlist *sg, int sg_count,
-				struct link_tbl_entry *link_tbl_ptr, u32 offset)
-{
-	link_tbl_ptr = sg_to_link_tbl(sg, sg_count, link_tbl_ptr, offset);
-	link_tbl_ptr->len |= 0x40000000;
-}
-
 /*
  * Fill in aead job descriptor
  */
@@ -1271,28 +1112,6 @@ static void init_ablkcipher_job(u32 *sh_desc, dma_addr_t ptr,
 	append_seq_out_ptr(desc, dst_dma, req->nbytes, out_options);
 }
 
-/*
- * derive number of elements in scatterlist
- */
-static int sg_count(struct scatterlist *sg_list, int nbytes)
-{
-	struct scatterlist *sg = sg_list;
-	int sg_nents = 0;
-
-	while (nbytes > 0) {
-		sg_nents++;
-		nbytes -= sg->length;
-		if (!sg_is_last(sg) && (sg + 1)->length == 0)
-			BUG(); /* Not support chaining */
-		sg = scatterwalk_sg_next(sg);
-	}
-
-	if (likely(sg_nents == 1))
-		return 0;
-
-	return sg_nents;
-}
-
 /*
  * allocate and map the aead extended descriptor
  */

drivers/crypto/caam/desc.h

@@ -8,6 +8,16 @@
 #ifndef DESC_H
 #define DESC_H
 
+struct link_tbl_entry {
+	u64 ptr;
+#define LINK_TBL_LEN_FIN 0x40000000
+#define LINK_TBL_LEN_EXT 0x80000000
+	u32 len;
+	u8 reserved;
+	u8 buf_pool_id;
+	u16 offset;
+};
+
 /* Max size of any CAAM descriptor in 32-bit words, inclusive of header */
 #define MAX_CAAM_DESCSIZE	64
 

drivers/crypto/caam/key_gen.c

@@ -0,0 +1,122 @@
+/*
+ * CAAM/SEC 4.x functions for handling key-generation jobs
+ *
+ * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ */
+#include "compat.h"
+#include "jr.h"
+#include "error.h"
+#include "desc_constr.h"
+#include "key_gen.h"
+
+void split_key_done(struct device *dev, u32 *desc, u32 err,
+			   void *context)
+{
+	struct split_key_result *res = context;
+
+#ifdef DEBUG
+	dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
+#endif
+
+	if (err) {
+		char tmp[CAAM_ERROR_STR_MAX];
+
+		dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err));
+	}
+
+	res->err = err;
+
+	complete(&res->completion);
+}
+EXPORT_SYMBOL(split_key_done);
+/*
+get a split ipad/opad key
+
+Split key generation-----------------------------------------------
+
+[00] 0xb0810008    jobdesc: stidx=1 share=never len=8
+[01] 0x04000014        key: class2->keyreg len=20
+			@0xffe01000
+[03] 0x84410014  operation: cls2-op sha1 hmac init dec
+[04] 0x24940000     fifold: class2 msgdata-last2 len=0 imm
+[05] 0xa4000001       jump: class2 local all ->1 [06]
+[06] 0x64260028    fifostr: class2 mdsplit-jdk len=40
+			@0xffe04000
+*/
+u32 gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len,
+		  int split_key_pad_len, const u8 *key_in, u32 keylen,
+		  u32 alg_op)
+{
+	u32 *desc;
+	struct split_key_result result;
+	dma_addr_t dma_addr_in, dma_addr_out;
+	int ret = 0;
+
+	desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
+
+	init_job_desc(desc, 0);
+
+	dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen,
+				     DMA_TO_DEVICE);
+	if (dma_mapping_error(jrdev, dma_addr_in)) {
+		dev_err(jrdev, "unable to map key input memory\n");
+		kfree(desc);
+		return -ENOMEM;
+	}
+	append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
+
+	/* Sets MDHA up into an HMAC-INIT */
+	append_operation(desc, alg_op | OP_ALG_DECRYPT | OP_ALG_AS_INIT);
+
+	/*
+	 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
+	 * into both pads inside MDHA
+	 */
+	append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
+				FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
+
+	/*
+	 * FIFO_STORE with the explicit split-key content store
+	 * (0x26 output type)
+	 */
+	dma_addr_out = dma_map_single(jrdev, key_out, split_key_pad_len,
+				      DMA_FROM_DEVICE);
+	if (dma_mapping_error(jrdev, dma_addr_out)) {
+		dev_err(jrdev, "unable to map key output memory\n");
+		kfree(desc);
+		return -ENOMEM;
+	}
+	append_fifo_store(desc, dma_addr_out, split_key_len,
+			  LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
+
+#ifdef DEBUG
+	print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
+		       DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
+	print_hex_dump(KERN_ERR, "jobdesc@"xstr(__LINE__)": ",
+		       DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
+#endif
+
+	result.err = 0;
+	init_completion(&result.completion);
+
+	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
+	if (!ret) {
+		/* in progress */
+		wait_for_completion_interruptible(&result.completion);
+		ret = result.err;
+#ifdef DEBUG
+		print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
+			       DUMP_PREFIX_ADDRESS, 16, 4, key_out,
+			       split_key_pad_len, 1);
+#endif
+	}
+
+	dma_unmap_single(jrdev, dma_addr_out, split_key_pad_len,
+			 DMA_FROM_DEVICE);
+	dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE);
+
+	kfree(desc);
+
+	return ret;
+}

drivers/crypto/caam/key_gen.h

@@ -0,0 +1,17 @@
+/*
+ * CAAM/SEC 4.x definitions for handling key-generation jobs
+ *
+ * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ */
+
+struct split_key_result {
+	struct completion completion;
+	int err;
+};
+
+void split_key_done(struct device *dev, u32 *desc, u32 err, void *context);
+
+u32 gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len,
+		    int split_key_pad_len, const u8 *key_in, u32 keylen,
+		    u32 alg_op);

drivers/crypto/caam/sg_link_tbl.h

@@ -0,0 +1,84 @@
+/*
+ * CAAM/SEC 4.x functions for using scatterlists in caam driver
+ *
+ * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ */
+
+struct link_tbl_entry;
+
+/*
+ * convert single dma address to h/w link table format
+ */
+static inline void sg_to_link_tbl_one(struct link_tbl_entry *link_tbl_ptr,
+				      dma_addr_t dma, u32 len, u32 offset)
+{
+	link_tbl_ptr->ptr = dma;
+	link_tbl_ptr->len = len;
+	link_tbl_ptr->reserved = 0;
+	link_tbl_ptr->buf_pool_id = 0;
+	link_tbl_ptr->offset = offset;
+#ifdef DEBUG
+	print_hex_dump(KERN_ERR, "link_tbl_ptr@: ",
+		       DUMP_PREFIX_ADDRESS, 16, 4, link_tbl_ptr,
+		       sizeof(struct link_tbl_entry), 1);
+#endif
+}
+
+/*
+ * convert scatterlist to h/w link table format
+ * but does not have final bit; instead, returns last entry
+ */
+static inline struct link_tbl_entry *
+sg_to_link_tbl(struct scatterlist *sg, int sg_count,
+	       struct link_tbl_entry *link_tbl_ptr, u32 offset)
+{
+	while (sg_count) {
+		sg_to_link_tbl_one(link_tbl_ptr, sg_dma_address(sg),
+				   sg_dma_len(sg), offset);
+		link_tbl_ptr++;
+		sg = sg_next(sg);
+		sg_count--;
+	}
+	return link_tbl_ptr - 1;
+}
+
+/*
+ * convert scatterlist to h/w link table format
+ * scatterlist must have been previously dma mapped
+ */
+static inline void sg_to_link_tbl_last(struct scatterlist *sg, int sg_count,
+				       struct link_tbl_entry *link_tbl_ptr,
+				       u32 offset)
+{
+	link_tbl_ptr = sg_to_link_tbl(sg, sg_count, link_tbl_ptr, offset);
+	link_tbl_ptr->len |= LINK_TBL_LEN_FIN;
+}
+
+/* count number of elements in scatterlist */
+static inline int __sg_count(struct scatterlist *sg_list, int nbytes)
+{
+	struct scatterlist *sg = sg_list;
+	int sg_nents = 0;
+
+	while (nbytes > 0) {
+		sg_nents++;
+		nbytes -= sg->length;
+		if (!sg_is_last(sg) && (sg + 1)->length == 0)
+			BUG(); /* Not support chaining */
+		sg = scatterwalk_sg_next(sg);
+	}
+
+	return sg_nents;
+}
+
+/* derive number of elements in scatterlist, but return 0 for 1 */
+static inline int sg_count(struct scatterlist *sg_list, int nbytes)
+{
+	int sg_nents = __sg_count(sg_list, nbytes);
+
+	if (likely(sg_nents == 1))
+		return 0;
+
+	return sg_nents;
+}