crypto: caam - pass key buffers with typesafe pointers

The 'key' field is defined as a 'u64' and used for two different
pieces of information: either to store a pointer or a dma_addr_t.
The former leads to a build error on 32-bit machines:

drivers/crypto/caam/caamalg_desc.c: In function 'cnstr_shdsc_aead_null_encap':
drivers/crypto/caam/caamalg_desc.c:67:27: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
drivers/crypto/caam/caamalg_desc.c: In function 'cnstr_shdsc_aead_null_decap':
drivers/crypto/caam/caamalg_desc.c:143:27: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]

Using a union to provide correct types gets rid of the warnings
and as well as a couple of redundant casts.

Fixes: db57656b0072 ("crypto: caam - group algorithm related params")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caamalg.c

@@ -162,10 +162,10 @@ static int aead_null_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_AEAD_NULL_ENC_LEN) {
 		ctx->adata.key_inline = true;
-		ctx->adata.key = (uintptr_t)ctx->key;
+		ctx->adata.key_virt = ctx->key;
 	} else {
 		ctx->adata.key_inline = false;
-		ctx->adata.key = ctx->key_dma;
+		ctx->adata.key_dma = ctx->key_dma;
 	}
 
 	/* aead_encrypt shared descriptor */
@@ -185,10 +185,10 @@ static int aead_null_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_AEAD_NULL_DEC_LEN) {
 		ctx->adata.key_inline = true;
-		ctx->adata.key = (uintptr_t)ctx->key;
+		ctx->adata.key_virt = ctx->key;
 	} else {
 		ctx->adata.key_inline = false;
-		ctx->adata.key = ctx->key_dma;
+		ctx->adata.key_dma = ctx->key_dma;
 	}
 
 	/* aead_decrypt shared descriptor */
@@ -262,14 +262,14 @@ static int aead_set_sh_desc(struct crypto_aead *aead)
 		return -EINVAL;
 
 	if (inl_mask & 1)
-		ctx->adata.key = (uintptr_t)ctx->key;
+		ctx->adata.key_virt = ctx->key;
 	else
-		ctx->adata.key = ctx->key_dma;
+		ctx->adata.key_dma = ctx->key_dma;
 
 	if (inl_mask & 2)
-		ctx->cdata.key = (uintptr_t)(ctx->key + ctx->adata.keylen_pad);
+		ctx->cdata.key_virt = ctx->key + ctx->adata.keylen_pad;
 	else
-		ctx->cdata.key = ctx->key_dma + ctx->adata.keylen_pad;
+		ctx->cdata.key_dma = ctx->key_dma + ctx->adata.keylen_pad;
 
 	ctx->adata.key_inline = !!(inl_mask & 1);
 	ctx->cdata.key_inline = !!(inl_mask & 2);
@@ -298,14 +298,14 @@ skip_enc:
 		return -EINVAL;
 
 	if (inl_mask & 1)
-		ctx->adata.key = (uintptr_t)ctx->key;
+		ctx->adata.key_virt = ctx->key;
 	else
-		ctx->adata.key = ctx->key_dma;
+		ctx->adata.key_dma = ctx->key_dma;
 
 	if (inl_mask & 2)
-		ctx->cdata.key = (uintptr_t)(ctx->key + ctx->adata.keylen_pad);
+		ctx->cdata.key_virt = ctx->key + ctx->adata.keylen_pad;
 	else
-		ctx->cdata.key = ctx->key_dma + ctx->adata.keylen_pad;
+		ctx->cdata.key_dma = ctx->key_dma + ctx->adata.keylen_pad;
 
 	ctx->adata.key_inline = !!(inl_mask & 1);
 	ctx->cdata.key_inline = !!(inl_mask & 2);
@@ -337,14 +337,14 @@ skip_enc:
 		return -EINVAL;
 
 	if (inl_mask & 1)
-		ctx->adata.key = (uintptr_t)ctx->key;
+		ctx->adata.key_virt = ctx->key;
 	else
-		ctx->adata.key = ctx->key_dma;
+		ctx->adata.key_dma = ctx->key_dma;
 
 	if (inl_mask & 2)
-		ctx->cdata.key = (uintptr_t)(ctx->key + ctx->adata.keylen_pad);
+		ctx->cdata.key_virt = ctx->key + ctx->adata.keylen_pad;
 	else
-		ctx->cdata.key = ctx->key_dma + ctx->adata.keylen_pad;
+		ctx->cdata.key_dma = ctx->key_dma + ctx->adata.keylen_pad;
 
 	ctx->adata.key_inline = !!(inl_mask & 1);
 	ctx->cdata.key_inline = !!(inl_mask & 2);
@@ -395,10 +395,10 @@ static int gcm_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_GCM_ENC_LEN) {
 		ctx->cdata.key_inline = true;
-		ctx->cdata.key = (uintptr_t)ctx->key;
+		ctx->cdata.key_virt = ctx->key;
 	} else {
 		ctx->cdata.key_inline = false;
-		ctx->cdata.key = ctx->key_dma;
+		ctx->cdata.key_dma = ctx->key_dma;
 	}
 
 	desc = ctx->sh_desc_enc;
@@ -417,10 +417,10 @@ static int gcm_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_GCM_DEC_LEN) {
 		ctx->cdata.key_inline = true;
-		ctx->cdata.key = (uintptr_t)ctx->key;
+		ctx->cdata.key_virt = ctx->key;
 	} else {
 		ctx->cdata.key_inline = false;
-		ctx->cdata.key = ctx->key_dma;
+		ctx->cdata.key_dma = ctx->key_dma;
 	}
 
 	desc = ctx->sh_desc_dec;
@@ -464,10 +464,10 @@ static int rfc4106_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_RFC4106_ENC_LEN) {
 		ctx->cdata.key_inline = true;
-		ctx->cdata.key = (uintptr_t)ctx->key;
+		ctx->cdata.key_virt = ctx->key;
 	} else {
 		ctx->cdata.key_inline = false;
-		ctx->cdata.key = ctx->key_dma;
+		ctx->cdata.key_dma = ctx->key_dma;
 	}
 
 	desc = ctx->sh_desc_enc;
@@ -486,10 +486,10 @@ static int rfc4106_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_RFC4106_DEC_LEN) {
 		ctx->cdata.key_inline = true;
-		ctx->cdata.key = (uintptr_t)ctx->key;
+		ctx->cdata.key_virt = ctx->key;
 	} else {
 		ctx->cdata.key_inline = false;
-		ctx->cdata.key = ctx->key_dma;
+		ctx->cdata.key_dma = ctx->key_dma;
 	}
 
 	desc = ctx->sh_desc_dec;
@@ -534,10 +534,10 @@ static int rfc4543_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_RFC4543_ENC_LEN) {
 		ctx->cdata.key_inline = true;
-		ctx->cdata.key = (uintptr_t)ctx->key;
+		ctx->cdata.key_virt = ctx->key;
 	} else {
 		ctx->cdata.key_inline = false;
-		ctx->cdata.key = ctx->key_dma;
+		ctx->cdata.key_dma = ctx->key_dma;
 	}
 
 	desc = ctx->sh_desc_enc;
@@ -556,10 +556,10 @@ static int rfc4543_set_sh_desc(struct crypto_aead *aead)
 	 */
 	if (rem_bytes >= DESC_RFC4543_DEC_LEN) {
 		ctx->cdata.key_inline = true;
-		ctx->cdata.key = (uintptr_t)ctx->key;
+		ctx->cdata.key_virt = ctx->key;
 	} else {
 		ctx->cdata.key_inline = false;
-		ctx->cdata.key = ctx->key_dma;
+		ctx->cdata.key_dma = ctx->key_dma;
 	}
 
 	desc = ctx->sh_desc_dec;
@@ -794,7 +794,7 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
 		return -ENOMEM;
 	}
 	ctx->cdata.keylen = keylen;
-	ctx->cdata.key = (uintptr_t)ctx->key;
+	ctx->cdata.key_virt = ctx->key;
 	ctx->cdata.key_inline = true;
 
 	/* ablkcipher_encrypt shared descriptor */
@@ -857,7 +857,7 @@ static int xts_ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
 		return -ENOMEM;
 	}
 	ctx->cdata.keylen = keylen;
-	ctx->cdata.key = (uintptr_t)ctx->key;
+	ctx->cdata.key_virt = ctx->key;
 	ctx->cdata.key_inline = true;
 
 	/* xts_ablkcipher_encrypt shared descriptor */

drivers/crypto/caam/caamalg_desc.c

@@ -64,11 +64,11 @@ void cnstr_shdsc_aead_null_encap(u32 * const desc, struct alginfo *adata,
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
 	if (adata->key_inline)
-		append_key_as_imm(desc, (void *)adata->key, adata->keylen_pad,
+		append_key_as_imm(desc, adata->key_virt, adata->keylen_pad,
 				  adata->keylen, CLASS_2 | KEY_DEST_MDHA_SPLIT |
 				  KEY_ENC);
 	else
-		append_key(desc, adata->key, adata->keylen, CLASS_2 |
+		append_key(desc, adata->key_dma, adata->keylen, CLASS_2 |
 			   KEY_DEST_MDHA_SPLIT | KEY_ENC);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -140,11 +140,11 @@ void cnstr_shdsc_aead_null_decap(u32 * const desc, struct alginfo *adata,
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
 	if (adata->key_inline)
-		append_key_as_imm(desc, (void *)adata->key, adata->keylen_pad,
+		append_key_as_imm(desc, adata->key_virt, adata->keylen_pad,
 				  adata->keylen, CLASS_2 |
 				  KEY_DEST_MDHA_SPLIT | KEY_ENC);
 	else
-		append_key(desc, adata->key, adata->keylen, CLASS_2 |
+		append_key(desc, adata->key_dma, adata->keylen, CLASS_2 |
 			   KEY_DEST_MDHA_SPLIT | KEY_ENC);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -225,18 +225,18 @@ static void init_sh_desc_key_aead(u32 * const desc,
 		enckeylen -= CTR_RFC3686_NONCE_SIZE;
 
 	if (adata->key_inline)
-		append_key_as_imm(desc, (void *)adata->key, adata->keylen_pad,
+		append_key_as_imm(desc, adata->key_virt, adata->keylen_pad,
 				  adata->keylen, CLASS_2 |
 				  KEY_DEST_MDHA_SPLIT | KEY_ENC);
 	else
-		append_key(desc, adata->key, adata->keylen, CLASS_2 |
+		append_key(desc, adata->key_dma, adata->keylen, CLASS_2 |
 			   KEY_DEST_MDHA_SPLIT | KEY_ENC);
 
 	if (cdata->key_inline)
-		append_key_as_imm(desc, (void *)cdata->key, enckeylen,
+		append_key_as_imm(desc, cdata->key_virt, enckeylen,
 				  enckeylen, CLASS_1 | KEY_DEST_CLASS_REG);
 	else
-		append_key(desc, cdata->key, enckeylen, CLASS_1 |
+		append_key(desc, cdata->key_dma, enckeylen, CLASS_1 |
 			   KEY_DEST_CLASS_REG);
 
 	/* Load Counter into CONTEXT1 reg */
@@ -536,10 +536,10 @@ void cnstr_shdsc_gcm_encap(u32 * const desc, struct alginfo *cdata,
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD | JUMP_COND_SELF);
 	if (cdata->key_inline)
-		append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+		append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 				  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 	else
-		append_key(desc, cdata->key, cdata->keylen, CLASS_1 |
+		append_key(desc, cdata->key_dma, cdata->keylen, CLASS_1 |
 			   KEY_DEST_CLASS_REG);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -626,10 +626,10 @@ void cnstr_shdsc_gcm_decap(u32 * const desc, struct alginfo *cdata,
 				   JUMP_TEST_ALL | JUMP_COND_SHRD |
 				   JUMP_COND_SELF);
 	if (cdata->key_inline)
-		append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+		append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 				  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 	else
-		append_key(desc, cdata->key, cdata->keylen, CLASS_1 |
+		append_key(desc, cdata->key_dma, cdata->keylen, CLASS_1 |
 			   KEY_DEST_CLASS_REG);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -702,10 +702,10 @@ void cnstr_shdsc_rfc4106_encap(u32 * const desc, struct alginfo *cdata,
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
 	if (cdata->key_inline)
-		append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+		append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 				  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 	else
-		append_key(desc, cdata->key, cdata->keylen, CLASS_1 |
+		append_key(desc, cdata->key_dma, cdata->keylen, CLASS_1 |
 			   KEY_DEST_CLASS_REG);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -773,11 +773,11 @@ void cnstr_shdsc_rfc4106_decap(u32 * const desc, struct alginfo *cdata,
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
 	if (cdata->key_inline)
-		append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+		append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 				  cdata->keylen, CLASS_1 |
 				  KEY_DEST_CLASS_REG);
 	else
-		append_key(desc, cdata->key, cdata->keylen, CLASS_1 |
+		append_key(desc, cdata->key_dma, cdata->keylen, CLASS_1 |
 			   KEY_DEST_CLASS_REG);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -845,10 +845,10 @@ void cnstr_shdsc_rfc4543_encap(u32 * const desc, struct alginfo *cdata,
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
 	if (cdata->key_inline)
-		append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+		append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 				  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 	else
-		append_key(desc, cdata->key, cdata->keylen, CLASS_1 |
+		append_key(desc, cdata->key_dma, cdata->keylen, CLASS_1 |
 			   KEY_DEST_CLASS_REG);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -915,10 +915,10 @@ void cnstr_shdsc_rfc4543_decap(u32 * const desc, struct alginfo *cdata,
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
 	if (cdata->key_inline)
-		append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+		append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 				  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 	else
-		append_key(desc, cdata->key, cdata->keylen, CLASS_1 |
+		append_key(desc, cdata->key_dma, cdata->keylen, CLASS_1 |
 			   KEY_DEST_CLASS_REG);
 	set_jump_tgt_here(desc, key_jump_cmd);
 
@@ -1006,12 +1006,12 @@ void cnstr_shdsc_ablkcipher_encap(u32 * const desc, struct alginfo *cdata,
 				   JUMP_COND_SHRD);
 
 	/* Load class1 key only */
-	append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+	append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 			  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 
 	/* Load nonce into CONTEXT1 reg */
 	if (is_rfc3686) {
-		u8 *nonce = (u8 *)cdata->key + cdata->keylen;
+		u8 *nonce = cdata->key_virt + cdata->keylen;
 
 		append_load_as_imm(desc, nonce, CTR_RFC3686_NONCE_SIZE,
 				   LDST_CLASS_IND_CCB |
@@ -1071,12 +1071,12 @@ void cnstr_shdsc_ablkcipher_decap(u32 * const desc, struct alginfo *cdata,
 				   JUMP_COND_SHRD);
 
 	/* Load class1 key only */
-	append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+	append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 			  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 
 	/* Load nonce into CONTEXT1 reg */
 	if (is_rfc3686) {
-		u8 *nonce = (u8 *)cdata->key + cdata->keylen;
+		u8 *nonce = cdata->key_virt + cdata->keylen;
 
 		append_load_as_imm(desc, nonce, CTR_RFC3686_NONCE_SIZE,
 				   LDST_CLASS_IND_CCB |
@@ -1140,12 +1140,12 @@ void cnstr_shdsc_ablkcipher_givencap(u32 * const desc, struct alginfo *cdata,
 				   JUMP_COND_SHRD);
 
 	/* Load class1 key only */
-	append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+	append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 			  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 
 	/* Load Nonce into CONTEXT1 reg */
 	if (is_rfc3686) {
-		u8 *nonce = (u8 *)cdata->key + cdata->keylen;
+		u8 *nonce = cdata->key_virt + cdata->keylen;
 
 		append_load_as_imm(desc, nonce, CTR_RFC3686_NONCE_SIZE,
 				   LDST_CLASS_IND_CCB |
@@ -1216,7 +1216,7 @@ void cnstr_shdsc_xts_ablkcipher_encap(u32 * const desc, struct alginfo *cdata)
 				   JUMP_COND_SHRD);
 
 	/* Load class1 keys only */
-	append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+	append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 			  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 
 	/* Load sector size with index 40 bytes (0x28) */
@@ -1268,7 +1268,7 @@ void cnstr_shdsc_xts_ablkcipher_decap(u32 * const desc, struct alginfo *cdata)
 				   JUMP_COND_SHRD);
 
 	/* Load class1 key only */
-	append_key_as_imm(desc, (void *)cdata->key, cdata->keylen,
+	append_key_as_imm(desc, cdata->key_virt, cdata->keylen,
 			  cdata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 
 	/* Load sector size with index 40 bytes (0x28) */

drivers/crypto/caam/desc_constr.h

@@ -446,7 +446,10 @@ struct alginfo {
 	u32 algtype;
 	unsigned int keylen;
 	unsigned int keylen_pad;
-	u64 key;
+	union {
+		dma_addr_t key_dma;
+		void *key_virt;
+	};
 	bool key_inline;
 };