crypto: x86 - remove SHA multibuffer routines and mcryptd

As it turns out, the AVX2 multibuffer SHA routines are currently
broken [0], in a way that would have likely been noticed if this
code were in wide use. Since the code is too complicated to be
maintained by anyone except the original authors, and since the
performance benefits for real-world use cases are debatable to
begin with, it is better to drop it entirely for the moment.

[0] https://marc.info/?l=linux-crypto-vger&m=153476243825350&w=2

Suggested-by: Eric Biggers <ebiggers@google.com>
Cc: Megha Dey <megha.dey@linux.intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 114 deletions

diff --git a/include/crypto/mcryptd.h b/include/crypto/mcryptd.h
deleted file mode 100644
index b67404fc4b34..000000000000
--- a/include/crypto/mcryptd.h
+++ /dev/null
@@ -1,114 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Software async multibuffer crypto daemon headers
- *
- *    Author:
- *             Tim Chen <tim.c.chen@linux.intel.com>
- *
- *    Copyright (c) 2014, Intel Corporation.
- */
-
-#ifndef _CRYPTO_MCRYPT_H
-#define _CRYPTO_MCRYPT_H
-
-#include <linux/crypto.h>
-#include <linux/kernel.h>
-#include <crypto/hash.h>
-
-struct mcryptd_ahash {
-	struct crypto_ahash base;
-};
-
-static inline struct mcryptd_ahash *__mcryptd_ahash_cast(
-	struct crypto_ahash *tfm)
-{
-	return (struct mcryptd_ahash *)tfm;
-}
-
-struct mcryptd_cpu_queue {
-	struct crypto_queue queue;
-	spinlock_t q_lock;
-	struct work_struct work;
-};
-
-struct mcryptd_queue {
-	struct mcryptd_cpu_queue __percpu *cpu_queue;
-};
-
-struct mcryptd_instance_ctx {
-	struct crypto_spawn spawn;
-	struct mcryptd_queue *queue;
-};
-
-struct mcryptd_hash_ctx {
-	struct crypto_ahash *child;
-	struct mcryptd_alg_state *alg_state;
-};
-
-struct mcryptd_tag {
-	/* seq number of request */
-	unsigned seq_num;
-	/* arrival time of request */
-	unsigned long arrival;
-	unsigned long expire;
-	int	cpu;
-};
-
-struct mcryptd_hash_request_ctx {
-	struct list_head waiter;
-	crypto_completion_t complete;
-	struct mcryptd_tag tag;
-	struct crypto_hash_walk walk;
-	u8 *out;
-	int flag;
-	struct ahash_request areq;
-};
-
-struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
-					u32 type, u32 mask);
-struct crypto_ahash *mcryptd_ahash_child(struct mcryptd_ahash *tfm);
-struct ahash_request *mcryptd_ahash_desc(struct ahash_request *req);
-void mcryptd_free_ahash(struct mcryptd_ahash *tfm);
-void mcryptd_flusher(struct work_struct *work);
-
-enum mcryptd_req_type {
-	MCRYPTD_NONE,
-	MCRYPTD_UPDATE,
-	MCRYPTD_FINUP,
-	MCRYPTD_DIGEST,
-	MCRYPTD_FINAL
-};
-
-struct mcryptd_alg_cstate {
-	unsigned long next_flush;
-	unsigned next_seq_num;
-	bool	flusher_engaged;
-	struct  delayed_work flush;
-	int	cpu;
-	struct  mcryptd_alg_state *alg_state;
-	void	*mgr;
-	spinlock_t work_lock;
-	struct list_head work_list;
-	struct list_head flush_list;
-};
-
-struct mcryptd_alg_state {
-	struct mcryptd_alg_cstate __percpu *alg_cstate;
-	unsigned long (*flusher)(struct mcryptd_alg_cstate *cstate);
-};
-
-/* return delay in jiffies from current time */
-static inline unsigned long get_delay(unsigned long t)
-{
-	long delay;
-
-	delay = (long) t - (long) jiffies;
-	if (delay <= 0)
-		return 0;
-	else
-		return (unsigned long) delay;
-}
-
-void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay);
-
-#endif