Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 185 insertions, 0 deletions

diff --git a/drivers/crypto/vmx/ghash.c b/drivers/crypto/vmx/ghash.c
new file mode 100644
index 000000000..2d1a8cd35
--- /dev/null
+++ b/drivers/crypto/vmx/ghash.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * GHASH routines supporting VMX instructions on the Power 8
+ *
+ * Copyright (C) 2015, 2019 International Business Machines Inc.
+ *
+ * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
+ *
+ * Extended by Daniel Axtens <dja@axtens.net> to replace the fallback
+ * mechanism. The new approach is based on arm64 code, which is:
+ *   Copyright (C) 2014 - 2018 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ */
+
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/crypto.h>
+#include <linux/delay.h>
+#include <linux/hardirq.h>
+#include <asm/switch_to.h>
+#include <crypto/aes.h>
+#include <crypto/ghash.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/internal/hash.h>
+#include <crypto/b128ops.h>
+
+#define IN_INTERRUPT in_interrupt()
+
+void gcm_init_p8(u128 htable[16], const u64 Xi[2]);
+void gcm_gmult_p8(u64 Xi[2], const u128 htable[16]);
+void gcm_ghash_p8(u64 Xi[2], const u128 htable[16],
+		  const u8 *in, size_t len);
+
+struct p8_ghash_ctx {
+	/* key used by vector asm */
+	u128 htable[16];
+	/* key used by software fallback */
+	be128 key;
+};
+
+struct p8_ghash_desc_ctx {
+	u64 shash[2];
+	u8 buffer[GHASH_DIGEST_SIZE];
+	int bytes;
+};
+
+static int p8_ghash_init(struct shash_desc *desc)
+{
+	struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
+
+	dctx->bytes = 0;
+	memset(dctx->shash, 0, GHASH_DIGEST_SIZE);
+	return 0;
+}
+
+static int p8_ghash_setkey(struct crypto_shash *tfm, const u8 *key,
+			   unsigned int keylen)
+{
+	struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(tfm));
+
+	if (keylen != GHASH_BLOCK_SIZE)
+		return -EINVAL;
+
+	preempt_disable();
+	pagefault_disable();
+	enable_kernel_vsx();
+	gcm_init_p8(ctx->htable, (const u64 *) key);
+	disable_kernel_vsx();
+	pagefault_enable();
+	preempt_enable();
+
+	memcpy(&ctx->key, key, GHASH_BLOCK_SIZE);
+
+	return 0;
+}
+
+static inline void __ghash_block(struct p8_ghash_ctx *ctx,
+				 struct p8_ghash_desc_ctx *dctx)
+{
+	if (!IN_INTERRUPT) {
+		preempt_disable();
+		pagefault_disable();
+		enable_kernel_vsx();
+		gcm_ghash_p8(dctx->shash, ctx->htable,
+				dctx->buffer, GHASH_DIGEST_SIZE);
+		disable_kernel_vsx();
+		pagefault_enable();
+		preempt_enable();
+	} else {
+		crypto_xor((u8 *)dctx->shash, dctx->buffer, GHASH_BLOCK_SIZE);
+		gf128mul_lle((be128 *)dctx->shash, &ctx->key);
+	}
+}
+
+static inline void __ghash_blocks(struct p8_ghash_ctx *ctx,
+				  struct p8_ghash_desc_ctx *dctx,
+				  const u8 *src, unsigned int srclen)
+{
+	if (!IN_INTERRUPT) {
+		preempt_disable();
+		pagefault_disable();
+		enable_kernel_vsx();
+		gcm_ghash_p8(dctx->shash, ctx->htable,
+				src, srclen);
+		disable_kernel_vsx();
+		pagefault_enable();
+		preempt_enable();
+	} else {
+		while (srclen >= GHASH_BLOCK_SIZE) {
+			crypto_xor((u8 *)dctx->shash, src, GHASH_BLOCK_SIZE);
+			gf128mul_lle((be128 *)dctx->shash, &ctx->key);
+			srclen -= GHASH_BLOCK_SIZE;
+			src += GHASH_BLOCK_SIZE;
+		}
+	}
+}
+
+static int p8_ghash_update(struct shash_desc *desc,
+			   const u8 *src, unsigned int srclen)
+{
+	unsigned int len;
+	struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
+	struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
+
+	if (dctx->bytes) {
+		if (dctx->bytes + srclen < GHASH_DIGEST_SIZE) {
+			memcpy(dctx->buffer + dctx->bytes, src,
+				srclen);
+			dctx->bytes += srclen;
+			return 0;
+		}
+		memcpy(dctx->buffer + dctx->bytes, src,
+			GHASH_DIGEST_SIZE - dctx->bytes);
+
+		__ghash_block(ctx, dctx);
+
+		src += GHASH_DIGEST_SIZE - dctx->bytes;
+		srclen -= GHASH_DIGEST_SIZE - dctx->bytes;
+		dctx->bytes = 0;
+	}
+	len = srclen & ~(GHASH_DIGEST_SIZE - 1);
+	if (len) {
+		__ghash_blocks(ctx, dctx, src, len);
+		src += len;
+		srclen -= len;
+	}
+	if (srclen) {
+		memcpy(dctx->buffer, src, srclen);
+		dctx->bytes = srclen;
+	}
+	return 0;
+}
+
+static int p8_ghash_final(struct shash_desc *desc, u8 *out)
+{
+	int i;
+	struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
+	struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
+
+	if (dctx->bytes) {
+		for (i = dctx->bytes; i < GHASH_DIGEST_SIZE; i++)
+			dctx->buffer[i] = 0;
+		__ghash_block(ctx, dctx);
+		dctx->bytes = 0;
+	}
+	memcpy(out, dctx->shash, GHASH_DIGEST_SIZE);
+	return 0;
+}
+
+struct shash_alg p8_ghash_alg = {
+	.digestsize = GHASH_DIGEST_SIZE,
+	.init = p8_ghash_init,
+	.update = p8_ghash_update,
+	.final = p8_ghash_final,
+	.setkey = p8_ghash_setkey,
+	.descsize = sizeof(struct p8_ghash_desc_ctx)
+		+ sizeof(struct ghash_desc_ctx),
+	.base = {
+		 .cra_name = "ghash",
+		 .cra_driver_name = "p8_ghash",
+		 .cra_priority = 1000,
+		 .cra_blocksize = GHASH_BLOCK_SIZE,
+		 .cra_ctxsize = sizeof(struct p8_ghash_ctx),
+		 .cra_module = THIS_MODULE,
+	},
+};