1 files changed, 71 insertions, 108 deletions

diff --git a/drivers/crypto/nx/nx-sha256.c b/drivers/crypto/nx/nx-sha256.c
index a6764af83c6d..5b29dd026df2 100644
--- a/drivers/crypto/nx/nx-sha256.c
+++ b/drivers/crypto/nx/nx-sha256.c
@@ -1,37 +1,32 @@
-/**
+// SPDX-License-Identifier: GPL-2.0-only
+/*
  * SHA-256 routines supporting the Power 7+ Nest Accelerators driver
  *
  * Copyright (C) 2011-2012 International Business Machines Inc.
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 only.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
  * Author: Kent Yoder <yoder1@us.ibm.com>
  */
 
 #include <crypto/internal/hash.h>
-#include <crypto/sha.h>
+#include <crypto/sha2.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
 #include <linux/module.h>
-#include <asm/vio.h>
-#include <asm/byteorder.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/unaligned.h>
 
 #include "nx_csbcpb.h"
 #include "nx.h"
 
+struct sha256_state_be {
+	__be32 state[SHA256_DIGEST_SIZE / 4];
+	u64 count;
+};
 
-static int nx_crypto_ctx_sha256_init(struct crypto_tfm *tfm)
+static int nx_crypto_ctx_sha256_init(struct crypto_shash *tfm)
 {
-	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
+	struct nx_crypto_ctx *nx_ctx = crypto_shash_ctx(tfm);
 	int err;
 
 	err = nx_crypto_ctx_sha_init(tfm);
@@ -47,10 +42,9 @@ static int nx_crypto_ctx_sha256_init(struct crypto_tfm *tfm)
 	return 0;
 }
 
-static int nx_sha256_init(struct shash_desc *desc) {
-	struct sha256_state *sctx = shash_desc_ctx(desc);
-
-	memset(sctx, 0, sizeof *sctx);
+static int nx_sha256_init(struct shash_desc *desc)
+{
+	struct sha256_state_be *sctx = shash_desc_ctx(desc);
 
 	sctx->state[0] = __cpu_to_be32(SHA256_H0);
 	sctx->state[1] = __cpu_to_be32(SHA256_H1);
@@ -68,30 +62,18 @@ static int nx_sha256_init(struct shash_desc *desc) {
 static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
 			    unsigned int len)
 {
-	struct sha256_state *sctx = shash_desc_ctx(desc);
-	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
+	struct nx_crypto_ctx *nx_ctx = crypto_shash_ctx(desc->tfm);
+	struct sha256_state_be *sctx = shash_desc_ctx(desc);
 	struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
+	u64 to_process, leftover, total = len;
 	struct nx_sg *out_sg;
-	u64 to_process = 0, leftover, total;
 	unsigned long irq_flags;
 	int rc = 0;
 	int data_len;
 	u32 max_sg_len;
-	u64 buf_len = (sctx->count % SHA256_BLOCK_SIZE);
 
 	spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 
-	/* 2 cases for total data len:
-	 *  1: < SHA256_BLOCK_SIZE: copy into state, return 0
-	 *  2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover
-	 */
-	total = (sctx->count % SHA256_BLOCK_SIZE) + len;
-	if (total < SHA256_BLOCK_SIZE) {
-		memcpy(sctx->buf + buf_len, data, len);
-		sctx->count += len;
-		goto out;
-	}
-
 	memcpy(csbcpb->cpb.sha256.message_digest, sctx->state, SHA256_DIGEST_SIZE);
 	NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 	NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
@@ -112,41 +94,17 @@ static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
 	}
 
 	do {
-		int used_sgs = 0;
 		struct nx_sg *in_sg = nx_ctx->in_sg;
 
-		if (buf_len) {
-			data_len = buf_len;
-			in_sg = nx_build_sg_list(in_sg,
-						 (u8 *) sctx->buf,
-						 &data_len,
-						 max_sg_len);
-
-			if (data_len != buf_len) {
-				rc = -EINVAL;
-				goto out;
-			}
-			used_sgs = in_sg - nx_ctx->in_sg;
-		}
+		to_process = total & ~(SHA256_BLOCK_SIZE - 1);
 
-		/* to_process: SHA256_BLOCK_SIZE aligned chunk to be
-		 * processed in this iteration. This value is restricted
-		 * by sg list limits and number of sgs we already used
-		 * for leftover data. (see above)
-		 * In ideal case, we could allow NX_PAGE_SIZE * max_sg_len,
-		 * but because data may not be aligned, we need to account
-		 * for that too. */
-		to_process = min_t(u64, total,
-			(max_sg_len - 1 - used_sgs) * NX_PAGE_SIZE);
-		to_process = to_process & ~(SHA256_BLOCK_SIZE - 1);
-
-		data_len = to_process - buf_len;
+		data_len = to_process;
 		in_sg = nx_build_sg_list(in_sg, (u8 *) data,
 					 &data_len, max_sg_len);
 
 		nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 
-		to_process = data_len + buf_len;
+		to_process = data_len;
 		leftover = total - to_process;
 
 		/*
@@ -162,34 +120,29 @@ static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
 			goto out;
 		}
 
-		rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
-				   desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
+		rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
 		if (rc)
 			goto out;
 
 		atomic_inc(&(nx_ctx->stats->sha256_ops));
 
 		total -= to_process;
-		data += to_process - buf_len;
-		buf_len = 0;
-
+		data += to_process;
+		sctx->count += to_process;
 	} while (leftover >= SHA256_BLOCK_SIZE);
 
-	/* copy the leftover back into the state struct */
-	if (leftover)
-		memcpy(sctx->buf, data, leftover);
-
-	sctx->count += len;
+	rc = leftover;
 	memcpy(sctx->state, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
 out:
 	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 	return rc;
 }
 
-static int nx_sha256_final(struct shash_desc *desc, u8 *out)
+static int nx_sha256_finup(struct shash_desc *desc, const u8 *src,
+			   unsigned int nbytes, u8 *out)
 {
-	struct sha256_state *sctx = shash_desc_ctx(desc);
-	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
+	struct nx_crypto_ctx *nx_ctx = crypto_shash_ctx(desc->tfm);
+	struct sha256_state_be *sctx = shash_desc_ctx(desc);
 	struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 	struct nx_sg *in_sg, *out_sg;
 	unsigned long irq_flags;
@@ -205,25 +158,19 @@ static int nx_sha256_final(struct shash_desc *desc, u8 *out)
 			nx_ctx->ap->databytelen/NX_PAGE_SIZE);
 
 	/* final is represented by continuing the operation and indicating that
-	 * this is not an intermediate operation */
-	if (sctx->count >= SHA256_BLOCK_SIZE) {
-		/* we've hit the nx chip previously, now we're finalizing,
-		 * so copy over the partial digest */
-		memcpy(csbcpb->cpb.sha256.input_partial_digest, sctx->state, SHA256_DIGEST_SIZE);
-		NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
-		NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
-	} else {
-		NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
-		NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
-	}
+	 * this is not an intermediate operation
+	 * copy over the partial digest */
+	memcpy(csbcpb->cpb.sha256.input_partial_digest, sctx->state, SHA256_DIGEST_SIZE);
+	NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
+	NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 
+	sctx->count += nbytes;
 	csbcpb->cpb.sha256.message_bit_length = (u64) (sctx->count * 8);
 
-	len = sctx->count & (SHA256_BLOCK_SIZE - 1);
-	in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) sctx->buf,
-				 &len, max_sg_len);
+	len = nbytes;
+	in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)src, &len, max_sg_len);
 
-	if (len != (sctx->count & (SHA256_BLOCK_SIZE - 1))) {
+	if (len != nbytes) {
 		rc = -EINVAL;
 		goto out;
 	}
@@ -243,8 +190,7 @@ static int nx_sha256_final(struct shash_desc *desc, u8 *out)
 		goto out;
 	}
 
-	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
-			   desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
+	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
 	if (rc)
 		goto out;
 
@@ -259,19 +205,35 @@ out:
 
 static int nx_sha256_export(struct shash_desc *desc, void *out)
 {
-	struct sha256_state *sctx = shash_desc_ctx(desc);
-
-	memcpy(out, sctx, sizeof(*sctx));
-
+	struct sha256_state_be *sctx = shash_desc_ctx(desc);
+	union {
+		u8 *u8;
+		u32 *u32;
+		u64 *u64;
+	} p = { .u8 = out };
+	int i;
+
+	for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(*p.u32); i++)
+		put_unaligned(be32_to_cpu(sctx->state[i]), p.u32++);
+
+	put_unaligned(sctx->count, p.u64++);
 	return 0;
 }
 
 static int nx_sha256_import(struct shash_desc *desc, const void *in)
 {
-	struct sha256_state *sctx = shash_desc_ctx(desc);
-
-	memcpy(sctx, in, sizeof(*sctx));
-
+	struct sha256_state_be *sctx = shash_desc_ctx(desc);
+	union {
+		const u8 *u8;
+		const u32 *u32;
+		const u64 *u64;
+	} p = { .u8 = in };
+	int i;
+
+	for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(*p.u32); i++)
+		sctx->state[i] = cpu_to_be32(get_unaligned(p.u32++));
+
+	sctx->count = get_unaligned(p.u64++);
 	return 0;
 }
 
@@ -279,19 +241,20 @@ struct shash_alg nx_shash_sha256_alg = {
 	.digestsize = SHA256_DIGEST_SIZE,
 	.init       = nx_sha256_init,
 	.update     = nx_sha256_update,
-	.final      = nx_sha256_final,
+	.finup      = nx_sha256_finup,
 	.export     = nx_sha256_export,
 	.import     = nx_sha256_import,
-	.descsize   = sizeof(struct sha256_state),
-	.statesize  = sizeof(struct sha256_state),
+	.init_tfm   = nx_crypto_ctx_sha256_init,
+	.exit_tfm   = nx_crypto_ctx_shash_exit,
+	.descsize   = sizeof(struct sha256_state_be),
+	.statesize  = sizeof(struct sha256_state_be),
 	.base       = {
 		.cra_name        = "sha256",
 		.cra_driver_name = "sha256-nx",
 		.cra_priority    = 300,
+		.cra_flags	 = CRYPTO_AHASH_ALG_BLOCK_ONLY,
 		.cra_blocksize   = SHA256_BLOCK_SIZE,
 		.cra_module      = THIS_MODULE,
 		.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
-		.cra_init        = nx_crypto_ctx_sha256_init,
-		.cra_exit        = nx_crypto_ctx_exit,
 	}
 };