1 files changed, 134 insertions, 0 deletions
diff --git a/drivers/crypto/vmx/aes.c b/drivers/crypto/vmx/aes.c
new file mode 100644
index 000000000..ec06189fb
--- /dev/null
+++ b/drivers/crypto/vmx/aes.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AES routines supporting VMX instructions on the Power 8
+ *
+ * Copyright (C) 2015 International Business Machines Inc.
+ *
+ * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/crypto.h>
+#include <linux/delay.h>
+#include <asm/simd.h>
+#include <asm/switch_to.h>
+#include <crypto/aes.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/simd.h>
+
+#include "aesp8-ppc.h"
+
+struct p8_aes_ctx {
+	struct crypto_cipher *fallback;
+	struct aes_key enc_key;
+	struct aes_key dec_key;
+};
+
+static int p8_aes_init(struct crypto_tfm *tfm)
+{
+	const char *alg = crypto_tfm_alg_name(tfm);
+	struct crypto_cipher *fallback;
+	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
+	if (IS_ERR(fallback)) {
+		printk(KERN_ERR
+		       "Failed to allocate transformation for '%s': %ld\n",
+		       alg, PTR_ERR(fallback));
+		return PTR_ERR(fallback);
+	}
+
+	crypto_cipher_set_flags(fallback,
+				crypto_cipher_get_flags((struct
+							 crypto_cipher *)
+							tfm));
+	ctx->fallback = fallback;
+
+	return 0;
+}
+
+static void p8_aes_exit(struct crypto_tfm *tfm)
+{
+	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	if (ctx->fallback) {
+		crypto_free_cipher(ctx->fallback);
+		ctx->fallback = NULL;
+	}
+}
+
+static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
+			 unsigned int keylen)
+{
+	int ret;
+	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	preempt_disable();
+	pagefault_disable();
+	enable_kernel_vsx();
+	ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
+	ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
+	disable_kernel_vsx();
+	pagefault_enable();
+	preempt_enable();
+
+	ret |= crypto_cipher_setkey(ctx->fallback, key, keylen);
+
+	return ret ? -EINVAL : 0;
+}
+
+static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	if (!crypto_simd_usable()) {
+		crypto_cipher_encrypt_one(ctx->fallback, dst, src);
+	} else {
+		preempt_disable();
+		pagefault_disable();
+		enable_kernel_vsx();
+		aes_p8_encrypt(src, dst, &ctx->enc_key);
+		disable_kernel_vsx();
+		pagefault_enable();
+		preempt_enable();
+	}
+}
+
+static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	if (!crypto_simd_usable()) {
+		crypto_cipher_decrypt_one(ctx->fallback, dst, src);
+	} else {
+		preempt_disable();
+		pagefault_disable();
+		enable_kernel_vsx();
+		aes_p8_decrypt(src, dst, &ctx->dec_key);
+		disable_kernel_vsx();
+		pagefault_enable();
+		preempt_enable();
+	}
+}
+
+struct crypto_alg p8_aes_alg = {
+	.cra_name = "aes",
+	.cra_driver_name = "p8_aes",
+	.cra_module = THIS_MODULE,
+	.cra_priority = 1000,
+	.cra_type = NULL,
+	.cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
+	.cra_alignmask = 0,
+	.cra_blocksize = AES_BLOCK_SIZE,
+	.cra_ctxsize = sizeof(struct p8_aes_ctx),
+	.cra_init = p8_aes_init,
+	.cra_exit = p8_aes_exit,
+	.cra_cipher = {
+		       .cia_min_keysize = AES_MIN_KEY_SIZE,
+		       .cia_max_keysize = AES_MAX_KEY_SIZE,
+		       .cia_setkey = p8_aes_setkey,
+		       .cia_encrypt = p8_aes_encrypt,
+		       .cia_decrypt = p8_aes_decrypt,
+	},
+};