crypto: ccp - Enable support for AES GCM on v5 CCPs

A version 5 device provides the primitive commands
required for AES GCM. This patch adds support for
en/decryption.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

5 files changed, 531 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile
index d2044b793aa8..60919a3ec53b 100644
--- a/drivers/crypto/ccp/Makefile
+++ b/drivers/crypto/ccp/Makefile
@@ -12,5 +12,6 @@ ccp-crypto-objs := ccp-crypto-main.o \
 		   ccp-crypto-aes.o \
 		   ccp-crypto-aes-cmac.o \
 		   ccp-crypto-aes-xts.o \
+		   ccp-crypto-aes-galois.o \
 		   ccp-crypto-des3.o \
 		   ccp-crypto-sha.o
diff --git a/drivers/crypto/ccp/ccp-crypto-aes-galois.c b/drivers/crypto/ccp/ccp-crypto-aes-galois.c
new file mode 100644
index 000000000000..38ee6f348ea9
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-aes-galois.c
@@ -0,0 +1,252 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ *
+ * 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
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/scatterlist.h>
+#include <linux/crypto.h>
+#include <crypto/internal/aead.h>
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/ctr.h>
+#include <crypto/scatterwalk.h>
+#include <linux/delay.h>
+
+#include "ccp-crypto.h"
+
+#define	AES_GCM_IVSIZE	12
+
+static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret)
+{
+	return ret;
+}
+
+static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
+			      unsigned int key_len)
+{
+	struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
+
+	switch (key_len) {
+	case AES_KEYSIZE_128:
+		ctx->u.aes.type = CCP_AES_TYPE_128;
+		break;
+	case AES_KEYSIZE_192:
+		ctx->u.aes.type = CCP_AES_TYPE_192;
+		break;
+	case AES_KEYSIZE_256:
+		ctx->u.aes.type = CCP_AES_TYPE_256;
+		break;
+	default:
+		crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
+	ctx->u.aes.mode = CCP_AES_MODE_GCM;
+	ctx->u.aes.key_len = key_len;
+
+	memcpy(ctx->u.aes.key, key, key_len);
+	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
+
+	return 0;
+}
+
+static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm,
+				   unsigned int authsize)
+{
+	return 0;
+}
+
+static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt)
+{
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
+	struct ccp_aes_req_ctx *rctx = aead_request_ctx(req);
+	struct scatterlist *iv_sg = NULL;
+	unsigned int iv_len = 0;
+	int i;
+	int ret = 0;
+
+	if (!ctx->u.aes.key_len)
+		return -EINVAL;
+
+	if (ctx->u.aes.mode != CCP_AES_MODE_GCM)
+		return -EINVAL;
+
+	if (!req->iv)
+		return -EINVAL;
+
+	/*
+	 * 5 parts:
+	 *   plaintext/ciphertext input
+	 *   AAD
+	 *   key
+	 *   IV
+	 *   Destination+tag buffer
+	 */
+
+	/* Prepare the IV: 12 bytes + an integer (counter) */
+	memcpy(rctx->iv, req->iv, AES_GCM_IVSIZE);
+	for (i = 0; i < 3; i++)
+		rctx->iv[i + AES_GCM_IVSIZE] = 0;
+	rctx->iv[AES_BLOCK_SIZE - 1] = 1;
+
+	/* Set up a scatterlist for the IV */
+	iv_sg = &rctx->iv_sg;
+	iv_len = AES_BLOCK_SIZE;
+	sg_init_one(iv_sg, rctx->iv, iv_len);
+
+	/* The AAD + plaintext are concatenated in the src buffer */
+	memset(&rctx->cmd, 0, sizeof(rctx->cmd));
+	INIT_LIST_HEAD(&rctx->cmd.entry);
+	rctx->cmd.engine = CCP_ENGINE_AES;
+	rctx->cmd.u.aes.type = ctx->u.aes.type;
+	rctx->cmd.u.aes.mode = ctx->u.aes.mode;
+	rctx->cmd.u.aes.action = encrypt;
+	rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
+	rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
+	rctx->cmd.u.aes.iv = iv_sg;
+	rctx->cmd.u.aes.iv_len = iv_len;
+	rctx->cmd.u.aes.src = req->src;
+	rctx->cmd.u.aes.src_len = req->cryptlen;
+	rctx->cmd.u.aes.aad_len = req->assoclen;
+
+	/* The cipher text + the tag are in the dst buffer */
+	rctx->cmd.u.aes.dst = req->dst;
+
+	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+
+	return ret;
+}
+
+static int ccp_aes_gcm_encrypt(struct aead_request *req)
+{
+	return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT);
+}
+
+static int ccp_aes_gcm_decrypt(struct aead_request *req)
+{
+	return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT);
+}
+
+static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm)
+{
+	struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
+
+	ctx->complete = ccp_aes_gcm_complete;
+	ctx->u.aes.key_len = 0;
+
+	crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
+
+	return 0;
+}
+
+static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm)
+{
+}
+
+static struct aead_alg ccp_aes_gcm_defaults = {
+	.setkey = ccp_aes_gcm_setkey,
+	.setauthsize = ccp_aes_gcm_setauthsize,
+	.encrypt = ccp_aes_gcm_encrypt,
+	.decrypt = ccp_aes_gcm_decrypt,
+	.init = ccp_aes_gcm_cra_init,
+	.ivsize = AES_GCM_IVSIZE,
+	.maxauthsize = AES_BLOCK_SIZE,
+	.base = {
+		.cra_flags	= CRYPTO_ALG_TYPE_ABLKCIPHER |
+				  CRYPTO_ALG_ASYNC |
+				  CRYPTO_ALG_KERN_DRIVER_ONLY |
+				  CRYPTO_ALG_NEED_FALLBACK,
+		.cra_blocksize	= AES_BLOCK_SIZE,
+		.cra_ctxsize	= sizeof(struct ccp_ctx),
+		.cra_priority	= CCP_CRA_PRIORITY,
+		.cra_type	= &crypto_ablkcipher_type,
+		.cra_exit	= ccp_aes_gcm_cra_exit,
+		.cra_module	= THIS_MODULE,
+	},
+};
+
+struct ccp_aes_aead_def {
+	enum ccp_aes_mode mode;
+	unsigned int version;
+	const char *name;
+	const char *driver_name;
+	unsigned int blocksize;
+	unsigned int ivsize;
+	struct aead_alg *alg_defaults;
+};
+
+static struct ccp_aes_aead_def aes_aead_algs[] = {
+	{
+		.mode		= CCP_AES_MODE_GHASH,
+		.version	= CCP_VERSION(5, 0),
+		.name		= "gcm(aes)",
+		.driver_name	= "gcm-aes-ccp",
+		.blocksize	= 1,
+		.ivsize		= AES_BLOCK_SIZE,
+		.alg_defaults	= &ccp_aes_gcm_defaults,
+	},
+};
+
+static int ccp_register_aes_aead(struct list_head *head,
+				 const struct ccp_aes_aead_def *def)
+{
+	struct ccp_crypto_aead *ccp_aead;
+	struct aead_alg *alg;
+	int ret;
+
+	ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL);
+	if (!ccp_aead)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&ccp_aead->entry);
+
+	ccp_aead->mode = def->mode;
+
+	/* Copy the defaults and override as necessary */
+	alg = &ccp_aead->alg;
+	*alg = *def->alg_defaults;
+	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+		 def->driver_name);
+	alg->base.cra_blocksize = def->blocksize;
+	alg->base.cra_ablkcipher.ivsize = def->ivsize;
+
+	ret = crypto_register_aead(alg);
+	if (ret) {
+		pr_err("%s ablkcipher algorithm registration error (%d)\n",
+		       alg->base.cra_name, ret);
+		kfree(ccp_aead);
+		return ret;
+	}
+
+	list_add(&ccp_aead->entry, head);
+
+	return 0;
+}
+
+int ccp_register_aes_aeads(struct list_head *head)
+{
+	int i, ret;
+	unsigned int ccpversion = ccp_version();
+
+	for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) {
+		if (aes_aead_algs[i].version > ccpversion)
+			continue;
+		ret = ccp_register_aes_aead(head, &aes_aead_algs[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
diff --git a/drivers/crypto/ccp/ccp-crypto-main.c b/drivers/crypto/ccp/ccp-crypto-main.c
index 3f1e36d7a8bf..8dccbddabef1 100644
--- a/drivers/crypto/ccp/ccp-crypto-main.c
+++ b/drivers/crypto/ccp/ccp-crypto-main.c
@@ -40,6 +40,7 @@ MODULE_PARM_DESC(des3_disable, "Disable use of 3DES - any non-zero value");
 /* List heads for the supported algorithms */
 static LIST_HEAD(hash_algs);
 static LIST_HEAD(cipher_algs);
+static LIST_HEAD(aead_algs);
 
 /* For any tfm, requests for that tfm must be returned on the order
  * received.  With multiple queues available, the CCP can process more
@@ -339,6 +340,10 @@ static int ccp_register_algs(void)
 		ret = ccp_register_aes_xts_algs(&cipher_algs);
 		if (ret)
 			return ret;
+
+		ret = ccp_register_aes_aeads(&aead_algs);
+		if (ret)
+			return ret;
 	}
 
 	if (!des3_disable) {
@@ -360,6 +365,7 @@ static void ccp_unregister_algs(void)
 {
 	struct ccp_crypto_ahash_alg *ahash_alg, *ahash_tmp;
 	struct ccp_crypto_ablkcipher_alg *ablk_alg, *ablk_tmp;
+	struct ccp_crypto_aead *aead_alg, *aead_tmp;
 
 	list_for_each_entry_safe(ahash_alg, ahash_tmp, &hash_algs, entry) {
 		crypto_unregister_ahash(&ahash_alg->alg);
@@ -372,6 +378,12 @@ static void ccp_unregister_algs(void)
 		list_del(&ablk_alg->entry);
 		kfree(ablk_alg);
 	}
+
+	list_for_each_entry_safe(aead_alg, aead_tmp, &aead_algs, entry) {
+		crypto_unregister_aead(&aead_alg->alg);
+		list_del(&aead_alg->entry);
+		kfree(aead_alg);
+	}
 }
 
 static int ccp_crypto_init(void)
diff --git a/drivers/crypto/ccp/ccp-crypto.h b/drivers/crypto/ccp/ccp-crypto.h
index 8c8bd3ff9f48..dd5bf15f06e5 100644
--- a/drivers/crypto/ccp/ccp-crypto.h
+++ b/drivers/crypto/ccp/ccp-crypto.h
@@ -19,6 +19,8 @@
 #include <linux/ccp.h>
 #include <crypto/algapi.h>
 #include <crypto/aes.h>
+#include <crypto/internal/aead.h>
+#include <crypto/aead.h>
 #include <crypto/ctr.h>
 #include <crypto/hash.h>
 #include <crypto/sha.h>
@@ -35,6 +37,14 @@ struct ccp_crypto_ablkcipher_alg {
 	struct crypto_alg alg;
 };
 
+struct ccp_crypto_aead {
+	struct list_head entry;
+
+	u32 mode;
+
+	struct aead_alg alg;
+};
+
 struct ccp_crypto_ahash_alg {
 	struct list_head entry;
 
@@ -97,6 +107,9 @@ struct ccp_aes_req_ctx {
 	struct scatterlist iv_sg;
 	u8 iv[AES_BLOCK_SIZE];
 
+	struct scatterlist tag_sg;
+	u8 tag[AES_BLOCK_SIZE];
+
 	/* Fields used for RFC3686 requests */
 	u8 *rfc3686_info;
 	u8 rfc3686_iv[AES_BLOCK_SIZE];
@@ -233,6 +246,7 @@ struct scatterlist *ccp_crypto_sg_table_add(struct sg_table *table,
 int ccp_register_aes_algs(struct list_head *head);
 int ccp_register_aes_cmac_algs(struct list_head *head);
 int ccp_register_aes_xts_algs(struct list_head *head);
+int ccp_register_aes_aeads(struct list_head *head);
 int ccp_register_sha_algs(struct list_head *head);
 int ccp_register_des3_algs(struct list_head *head);
 
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index 0de961a22ab4..c0dfdacbdff5 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -601,6 +601,255 @@ e_key:
 	return ret;
 }
 
+static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
+			       struct ccp_cmd *cmd)
+{
+	struct ccp_aes_engine *aes = &cmd->u.aes;
+	struct ccp_dm_workarea key, ctx, final_wa, tag;
+	struct ccp_data src, dst;
+	struct ccp_data aad;
+	struct ccp_op op;
+
+	unsigned long long *final;
+	unsigned int dm_offset;
+	unsigned int ilen;
+	bool in_place = true; /* Default value */
+	int ret;
+
+	struct scatterlist *p_inp, sg_inp[2];
+	struct scatterlist *p_tag, sg_tag[2];
+	struct scatterlist *p_outp, sg_outp[2];
+	struct scatterlist *p_aad;
+
+	if (!aes->iv)
+		return -EINVAL;
+
+	if (!((aes->key_len == AES_KEYSIZE_128) ||
+		(aes->key_len == AES_KEYSIZE_192) ||
+		(aes->key_len == AES_KEYSIZE_256)))
+		return -EINVAL;
+
+	if (!aes->key) /* Gotta have a key SGL */
+		return -EINVAL;
+
+	/* First, decompose the source buffer into AAD & PT,
+	 * and the destination buffer into AAD, CT & tag, or
+	 * the input into CT & tag.
+	 * It is expected that the input and output SGs will
+	 * be valid, even if the AAD and input lengths are 0.
+	 */
+	p_aad = aes->src;
+	p_inp = scatterwalk_ffwd(sg_inp, aes->src, aes->aad_len);
+	p_outp = scatterwalk_ffwd(sg_outp, aes->dst, aes->aad_len);
+	if (aes->action == CCP_AES_ACTION_ENCRYPT) {
+		ilen = aes->src_len;
+		p_tag = scatterwalk_ffwd(sg_tag, p_outp, ilen);
+	} else {
+		/* Input length for decryption includes tag */
+		ilen = aes->src_len - AES_BLOCK_SIZE;
+		p_tag = scatterwalk_ffwd(sg_tag, p_inp, ilen);
+	}
+
+	memset(&op, 0, sizeof(op));
+	op.cmd_q = cmd_q;
+	op.jobid = CCP_NEW_JOBID(cmd_q->ccp);
+	op.sb_key = cmd_q->sb_key; /* Pre-allocated */
+	op.sb_ctx = cmd_q->sb_ctx; /* Pre-allocated */
+	op.init = 1;
+	op.u.aes.type = aes->type;
+
+	/* Copy the key to the LSB */
+	ret = ccp_init_dm_workarea(&key, cmd_q,
+				   CCP_AES_CTX_SB_COUNT * CCP_SB_BYTES,
+				   DMA_TO_DEVICE);
+	if (ret)
+		return ret;
+
+	dm_offset = CCP_SB_BYTES - aes->key_len;
+	ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
+	ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
+			     CCP_PASSTHRU_BYTESWAP_256BIT);
+	if (ret) {
+		cmd->engine_error = cmd_q->cmd_error;
+		goto e_key;
+	}
+
+	/* Copy the context (IV) to the LSB.
+	 * There is an assumption here that the IV is 96 bits in length, plus
+	 * a nonce of 32 bits. If no IV is present, use a zeroed buffer.
+	 */
+	ret = ccp_init_dm_workarea(&ctx, cmd_q,
+				   CCP_AES_CTX_SB_COUNT * CCP_SB_BYTES,
+				   DMA_BIDIRECTIONAL);
+	if (ret)
+		goto e_key;
+
+	dm_offset = CCP_AES_CTX_SB_COUNT * CCP_SB_BYTES - aes->iv_len;
+	ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
+
+	ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
+			     CCP_PASSTHRU_BYTESWAP_256BIT);
+	if (ret) {
+		cmd->engine_error = cmd_q->cmd_error;
+		goto e_ctx;
+	}
+
+	op.init = 1;
+	if (aes->aad_len > 0) {
+		/* Step 1: Run a GHASH over the Additional Authenticated Data */
+		ret = ccp_init_data(&aad, cmd_q, p_aad, aes->aad_len,
+				    AES_BLOCK_SIZE,
+				    DMA_TO_DEVICE);
+		if (ret)
+			goto e_ctx;
+
+		op.u.aes.mode = CCP_AES_MODE_GHASH;
+		op.u.aes.action = CCP_AES_GHASHAAD;
+
+		while (aad.sg_wa.bytes_left) {
+			ccp_prepare_data(&aad, NULL, &op, AES_BLOCK_SIZE, true);
+
+			ret = cmd_q->ccp->vdata->perform->aes(&op);
+			if (ret) {
+				cmd->engine_error = cmd_q->cmd_error;
+				goto e_aad;
+			}
+
+			ccp_process_data(&aad, NULL, &op);
+			op.init = 0;
+		}
+	}
+
+	op.u.aes.mode = CCP_AES_MODE_GCTR;
+	op.u.aes.action = aes->action;
+
+	if (ilen > 0) {
+		/* Step 2: Run a GCTR over the plaintext */
+		in_place = (sg_virt(p_inp) == sg_virt(p_outp)) ? true : false;
+
+		ret = ccp_init_data(&src, cmd_q, p_inp, ilen,
+				    AES_BLOCK_SIZE,
+				    in_place ? DMA_BIDIRECTIONAL
+					     : DMA_TO_DEVICE);
+		if (ret)
+			goto e_ctx;
+
+		if (in_place) {
+			dst = src;
+		} else {
+			ret = ccp_init_data(&dst, cmd_q, p_outp, ilen,
+					    AES_BLOCK_SIZE, DMA_FROM_DEVICE);
+			if (ret)
+				goto e_src;
+		}
+
+		op.soc = 0;
+		op.eom = 0;
+		op.init = 1;
+		while (src.sg_wa.bytes_left) {
+			ccp_prepare_data(&src, &dst, &op, AES_BLOCK_SIZE, true);
+			if (!src.sg_wa.bytes_left) {
+				unsigned int nbytes = aes->src_len
+						      % AES_BLOCK_SIZE;
+
+				if (nbytes) {
+					op.eom = 1;
+					op.u.aes.size = (nbytes * 8) - 1;
+				}
+			}
+
+			ret = cmd_q->ccp->vdata->perform->aes(&op);
+			if (ret) {
+				cmd->engine_error = cmd_q->cmd_error;
+				goto e_dst;
+			}
+
+			ccp_process_data(&src, &dst, &op);
+			op.init = 0;
+		}
+	}
+
+	/* Step 3: Update the IV portion of the context with the original IV */
+	ret = ccp_copy_from_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
+			       CCP_PASSTHRU_BYTESWAP_256BIT);
+	if (ret) {
+		cmd->engine_error = cmd_q->cmd_error;
+		goto e_dst;
+	}
+
+	ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
+
+	ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
+			     CCP_PASSTHRU_BYTESWAP_256BIT);
+	if (ret) {
+		cmd->engine_error = cmd_q->cmd_error;
+		goto e_dst;
+	}
+
+	/* Step 4: Concatenate the lengths of the AAD and source, and
+	 * hash that 16 byte buffer.
+	 */
+	ret = ccp_init_dm_workarea(&final_wa, cmd_q, AES_BLOCK_SIZE,
+				   DMA_BIDIRECTIONAL);
+	if (ret)
+		goto e_dst;
+	final = (unsigned long long *) final_wa.address;
+	final[0] = cpu_to_be64(aes->aad_len * 8);
+	final[1] = cpu_to_be64(ilen * 8);
+
+	op.u.aes.mode = CCP_AES_MODE_GHASH;
+	op.u.aes.action = CCP_AES_GHASHFINAL;
+	op.src.type = CCP_MEMTYPE_SYSTEM;
+	op.src.u.dma.address = final_wa.dma.address;
+	op.src.u.dma.length = AES_BLOCK_SIZE;
+	op.dst.type = CCP_MEMTYPE_SYSTEM;
+	op.dst.u.dma.address = final_wa.dma.address;
+	op.dst.u.dma.length = AES_BLOCK_SIZE;
+	op.eom = 1;
+	op.u.aes.size = 0;
+	ret = cmd_q->ccp->vdata->perform->aes(&op);
+	if (ret)
+		goto e_dst;
+
+	if (aes->action == CCP_AES_ACTION_ENCRYPT) {
+		/* Put the ciphered tag after the ciphertext. */
+		ccp_get_dm_area(&final_wa, 0, p_tag, 0, AES_BLOCK_SIZE);
+	} else {
+		/* Does this ciphered tag match the input? */
+		ret = ccp_init_dm_workarea(&tag, cmd_q, AES_BLOCK_SIZE,
+					   DMA_BIDIRECTIONAL);
+		if (ret)
+			goto e_tag;
+		ccp_set_dm_area(&tag, 0, p_tag, 0, AES_BLOCK_SIZE);
+
+		ret = memcmp(tag.address, final_wa.address, AES_BLOCK_SIZE);
+		ccp_dm_free(&tag);
+	}
+
+e_tag:
+	ccp_dm_free(&final_wa);
+
+e_dst:
+	if (aes->src_len && !in_place)
+		ccp_free_data(&dst, cmd_q);
+
+e_src:
+	if (aes->src_len)
+		ccp_free_data(&src, cmd_q);
+
+e_aad:
+	if (aes->aad_len)
+		ccp_free_data(&aad, cmd_q);
+
+e_ctx:
+	ccp_dm_free(&ctx);
+
+e_key:
+	ccp_dm_free(&key);
+
+	return ret;
+}
+
 static int ccp_run_aes_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 {
 	struct ccp_aes_engine *aes = &cmd->u.aes;
@@ -614,6 +863,9 @@ static int ccp_run_aes_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	if (aes->mode == CCP_AES_MODE_CMAC)
 		return ccp_run_aes_cmac_cmd(cmd_q, cmd);
 
+	if (aes->mode == CCP_AES_MODE_GCM)
+		return ccp_run_aes_gcm_cmd(cmd_q, cmd);
+
 	if (!((aes->key_len == AES_KEYSIZE_128) ||
 	      (aes->key_len == AES_KEYSIZE_192) ||
 	      (aes->key_len == AES_KEYSIZE_256)))