diff options
Diffstat (limited to 'arch/x86/crypto/sha256-mb/sha256_mb.c')
| -rw-r--r-- | arch/x86/crypto/sha256-mb/sha256_mb.c | 1030 |
1 files changed, 1030 insertions, 0 deletions
diff --git a/arch/x86/crypto/sha256-mb/sha256_mb.c b/arch/x86/crypto/sha256-mb/sha256_mb.c new file mode 100644 index 000000000000..89fa85e8b10c --- /dev/null +++ b/arch/x86/crypto/sha256-mb/sha256_mb.c @@ -0,0 +1,1030 @@ +/* + * Multi buffer SHA256 algorithm Glue Code + * + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2016 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * 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. + * + * Contact Information: + * Megha Dey <megha.dey@linux.intel.com> + * + * BSD LICENSE + * + * Copyright(c) 2016 Intel Corporation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <crypto/internal/hash.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/cryptohash.h> +#include <linux/types.h> +#include <linux/list.h> +#include <crypto/scatterwalk.h> +#include <crypto/sha.h> +#include <crypto/mcryptd.h> +#include <crypto/crypto_wq.h> +#include <asm/byteorder.h> +#include <linux/hardirq.h> +#include <asm/fpu/api.h> +#include "sha256_mb_ctx.h" + +#define FLUSH_INTERVAL 1000 /* in usec */ + +static struct mcryptd_alg_state sha256_mb_alg_state; + +struct sha256_mb_ctx { + struct mcryptd_ahash *mcryptd_tfm; +}; + +static inline struct mcryptd_hash_request_ctx + *cast_hash_to_mcryptd_ctx(struct sha256_hash_ctx *hash_ctx) +{ + struct ahash_request *areq; + + areq = container_of((void *) hash_ctx, struct ahash_request, __ctx); + return container_of(areq, struct mcryptd_hash_request_ctx, areq); +} + +static inline struct ahash_request + *cast_mcryptd_ctx_to_req(struct mcryptd_hash_request_ctx *ctx) +{ + return container_of((void *) ctx, struct ahash_request, __ctx); +} + +static void req_ctx_init(struct mcryptd_hash_request_ctx *rctx, + struct ahash_request *areq) +{ + rctx->flag = HASH_UPDATE; +} + +static asmlinkage void (*sha256_job_mgr_init)(struct sha256_mb_mgr *state); +static asmlinkage struct job_sha256* (*sha256_job_mgr_submit) + (struct sha256_mb_mgr *state, struct job_sha256 *job); +static asmlinkage struct job_sha256* (*sha256_job_mgr_flush) + (struct sha256_mb_mgr *state); +static asmlinkage struct job_sha256* (*sha256_job_mgr_get_comp_job) + (struct sha256_mb_mgr *state); + +inline void sha256_init_digest(uint32_t *digest) +{ + static const uint32_t initial_digest[SHA256_DIGEST_LENGTH] = { + SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3, + SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7}; + memcpy(digest, initial_digest, sizeof(initial_digest)); +} + +inline uint32_t sha256_pad(uint8_t padblock[SHA256_BLOCK_SIZE * 2], + uint32_t total_len) +{ + uint32_t i = total_len & (SHA256_BLOCK_SIZE - 1); + + memset(&padblock[i], 0, SHA256_BLOCK_SIZE); + padblock[i] = 0x80; + + i += ((SHA256_BLOCK_SIZE - 1) & + (0 - (total_len + SHA256_PADLENGTHFIELD_SIZE + 1))) + + 1 + SHA256_PADLENGTHFIELD_SIZE; + +#if SHA256_PADLENGTHFIELD_SIZE == 16 + *((uint64_t *) &padblock[i - 16]) = 0; +#endif + + *((uint64_t *) &padblock[i - 8]) = cpu_to_be64(total_len << 3); + + /* Number of extra blocks to hash */ + return i >> SHA256_LOG2_BLOCK_SIZE; +} + +static struct sha256_hash_ctx + *sha256_ctx_mgr_resubmit(struct sha256_ctx_mgr *mgr, + struct sha256_hash_ctx *ctx) +{ + while (ctx) { + if (ctx->status & HASH_CTX_STS_COMPLETE) { + /* Clear PROCESSING bit */ + ctx->status = HASH_CTX_STS_COMPLETE; + return ctx; + } + + /* + * If the extra blocks are empty, begin hashing what remains + * in the user's buffer. + */ + if (ctx->partial_block_buffer_length == 0 && + ctx->incoming_buffer_length) { + + const void *buffer = ctx->incoming_buffer; + uint32_t len = ctx->incoming_buffer_length; + uint32_t copy_len; + + /* + * Only entire blocks can be hashed. + * Copy remainder to extra blocks buffer. + */ + copy_len = len & (SHA256_BLOCK_SIZE-1); + + if (copy_len) { + len -= copy_len; + memcpy(ctx->partial_block_buffer, + ((const char *) buffer + len), + copy_len); + ctx->partial_block_buffer_length = copy_len; + } + + ctx->incoming_buffer_length = 0; + + /* len should be a multiple of the block size now */ + assert((len % SHA256_BLOCK_SIZE) == 0); + + /* Set len to the number of blocks to be hashed */ + len >>= SHA256_LOG2_BLOCK_SIZE; + + if (len) { + + ctx->job.buffer = (uint8_t *) buffer; + ctx->job.len = len; + ctx = (struct sha256_hash_ctx *) + sha256_job_mgr_submit(&mgr->mgr, &ctx->job); + continue; + } + } + + /* + * If the extra blocks are not empty, then we are + * either on the last block(s) or we need more + * user input before continuing. + */ + if (ctx->status & HASH_CTX_STS_LAST) { + + uint8_t *buf = ctx->partial_block_buffer; + uint32_t n_extra_blocks = + sha256_pad(buf, ctx->total_length); + + ctx->status = (HASH_CTX_STS_PROCESSING | + HASH_CTX_STS_COMPLETE); + ctx->job.buffer = buf; + ctx->job.len = (uint32_t) n_extra_blocks; + ctx = (struct sha256_hash_ctx *) + sha256_job_mgr_submit(&mgr->mgr, &ctx->job); + continue; + } + + ctx->status = HASH_CTX_STS_IDLE; + return ctx; + } + + return NULL; +} + +static struct sha256_hash_ctx + *sha256_ctx_mgr_get_comp_ctx(struct sha256_ctx_mgr *mgr) +{ + /* + * If get_comp_job returns NULL, there are no jobs complete. + * If get_comp_job returns a job, verify that it is safe to return to + * the user. If it is not ready, resubmit the job to finish processing. + * If sha256_ctx_mgr_resubmit returned a job, it is ready to be + * returned. Otherwise, all jobs currently being managed by the + * hash_ctx_mgr still need processing. + */ + struct sha256_hash_ctx *ctx; + + ctx = (struct sha256_hash_ctx *) sha256_job_mgr_get_comp_job(&mgr->mgr); + return sha256_ctx_mgr_resubmit(mgr, ctx); +} + +static void sha256_ctx_mgr_init(struct sha256_ctx_mgr *mgr) +{ + sha256_job_mgr_init(&mgr->mgr); +} + +static struct sha256_hash_ctx *sha256_ctx_mgr_submit(struct sha256_ctx_mgr *mgr, + struct sha256_hash_ctx *ctx, + const void *buffer, + uint32_t len, + int flags) +{ + if (flags & (~HASH_ENTIRE)) { + /* User should not pass anything other than FIRST, UPDATE + * or LAST + */ + ctx->error = HASH_CTX_ERROR_INVALID_FLAGS; + return ctx; + } + + if (ctx->status & HASH_CTX_STS_PROCESSING) { + /* Cannot submit to a currently processing job. */ + ctx->error = HASH_CTX_ERROR_ALREADY_PROCESSING; + return ctx; + } + + if ((ctx->status & HASH_CTX_STS_COMPLETE) && !(flags & HASH_FIRST)) { + /* Cannot update a finished job. */ + ctx->error = HASH_CTX_ERROR_ALREADY_COMPLETED; + return ctx; + } + + if (flags & HASH_FIRST) { + /* Init digest */ + sha256_init_digest(ctx->job.result_digest); + + /* Reset byte counter */ + ctx->total_length = 0; + + /* Clear extra blocks */ + ctx->partial_block_buffer_length = 0; + } + + /* If we made it here, there was no error during this call to submit */ + ctx->error = HASH_CTX_ERROR_NONE; + + /* Store buffer ptr info from user */ + ctx->incoming_buffer = buffer; + ctx->incoming_buffer_length = len; + + /* + * Store the user's request flags and mark this ctx as currently + * being processed. + */ + ctx->status = (flags & HASH_LAST) ? + (HASH_CTX_STS_PROCESSING | HASH_CTX_STS_LAST) : + HASH_CTX_STS_PROCESSING; + + /* Advance byte counter */ + ctx->total_length += len; + + /* + * If there is anything currently buffered in the extra blocks, + * append to it until it contains a whole block. + * Or if the user's buffer contains less than a whole block, + * append as much as possible to the extra block. + */ + if (ctx->partial_block_buffer_length || len < SHA256_BLOCK_SIZE) { + /* + * Compute how many bytes to copy from user buffer into + * extra block + */ + uint32_t copy_len = SHA256_BLOCK_SIZE - + ctx->partial_block_buffer_length; + if (len < copy_len) + copy_len = len; + + if (copy_len) { + /* Copy and update relevant pointers and counters */ + memcpy( + &ctx->partial_block_buffer[ctx->partial_block_buffer_length], + buffer, copy_len); + + ctx->partial_block_buffer_length += copy_len; + ctx->incoming_buffer = (const void *) + ((const char *)buffer + copy_len); + ctx->incoming_buffer_length = len - copy_len; + } + + /* The extra block should never contain more than 1 block */ + assert(ctx->partial_block_buffer_length <= SHA256_BLOCK_SIZE); + + /* + * If the extra block buffer contains exactly 1 block, + * it can be hashed. + */ + if (ctx->partial_block_buffer_length >= SHA256_BLOCK_SIZE) { + ctx->partial_block_buffer_length = 0; + + ctx->job.buffer = ctx->partial_block_buffer; + ctx->job.len = 1; + ctx = (struct sha256_hash_ctx *) + sha256_job_mgr_submit(&mgr->mgr, &ctx->job); + } + } + + return sha256_ctx_mgr_resubmit(mgr, ctx); +} + +static struct sha256_hash_ctx *sha256_ctx_mgr_flush(struct sha256_ctx_mgr *mgr) +{ + struct sha256_hash_ctx *ctx; + + while (1) { + ctx = (struct sha256_hash_ctx *) + sha256_job_mgr_flush(&mgr->mgr); + + /* If flush returned 0, there are no more jobs in flight. */ + if (!ctx) + return NULL; + + /* + * If flush returned a job, resubmit the job to finish + * processing. + */ + ctx = sha256_ctx_mgr_resubmit(mgr, ctx); + + /* + * If sha256_ctx_mgr_resubmit returned a job, it is ready to + * be returned. Otherwise, all jobs currently being managed by + * the sha256_ctx_mgr still need processing. Loop. + */ + if (ctx) + return ctx; + } +} + +static int sha256_mb_init(struct ahash_request *areq) +{ + struct sha256_hash_ctx *sctx = ahash_request_ctx(areq); + + hash_ctx_init(sctx); + sctx->job.result_digest[0] = SHA256_H0; + sctx->job.result_digest[1] = SHA256_H1; + sctx->job.result_digest[2] = SHA256_H2; + sctx->job.result_digest[3] = SHA256_H3; + sctx->job.result_digest[4] = SHA256_H4; + sctx->job.result_digest[5] = SHA256_H5; + sctx->job.result_digest[6] = SHA256_H6; + sctx->job.result_digest[7] = SHA256_H7; + sctx->total_length = 0; + sctx->partial_block_buffer_length = 0; + sctx->status = HASH_CTX_STS_IDLE; + + return 0; +} + +static int sha256_mb_set_results(struct mcryptd_hash_request_ctx *rctx) +{ + int i; + struct sha256_hash_ctx *sctx = ahash_request_ctx(&rctx->areq); + __be32 *dst = (__be32 *) rctx->out; + + for (i = 0; i < 8; ++i) + dst[i] = cpu_to_be32(sctx->job.result_digest[i]); + + return 0; +} + +static int sha_finish_walk(struct mcryptd_hash_request_ctx **ret_rctx, + struct mcryptd_alg_cstate *cstate, bool flush) +{ + int flag = HASH_UPDATE; + int nbytes, err = 0; + struct mcryptd_hash_request_ctx *rctx = *ret_rctx; + struct sha256_hash_ctx *sha_ctx; + + /* more work ? */ + while (!(rctx->flag & HASH_DONE)) { + nbytes = crypto_ahash_walk_done(&rctx->walk, 0); + if (nbytes < 0) { + err = nbytes; + goto out; + } + /* check if the walk is done */ + if (crypto_ahash_walk_last(&rctx->walk)) { + rctx->flag |= HASH_DONE; + if (rctx->flag & HASH_FINAL) + flag |= HASH_LAST; + + } + sha_ctx = (struct sha256_hash_ctx *) + ahash_request_ctx(&rctx->areq); + kernel_fpu_begin(); + sha_ctx = sha256_ctx_mgr_submit(cstate->mgr, sha_ctx, + rctx->walk.data, nbytes, flag); + if (!sha_ctx) { + if (flush) + sha_ctx = sha256_ctx_mgr_flush(cstate->mgr); + } + kernel_fpu_end(); + if (sha_ctx) + rctx = cast_hash_to_mcryptd_ctx(sha_ctx); + else { + rctx = NULL; + goto out; + } + } + + /* copy the results */ + if (rctx->flag & HASH_FINAL) + sha256_mb_set_results(rctx); + +out: + *ret_rctx = rctx; + return err; +} + +static int sha_complete_job(struct mcryptd_hash_request_ctx *rctx, + struct mcryptd_alg_cstate *cstate, + int err) +{ + struct ahash_request *req = cast_mcryptd_ctx_to_req(rctx); + struct sha256_hash_ctx *sha_ctx; + struct mcryptd_hash_request_ctx *req_ctx; + int ret; + + /* remove from work list */ + spin_lock(&cstate->work_lock); + list_del(&rctx->waiter); + spin_unlock(&cstate->work_lock); + + if (irqs_disabled()) + rctx->complete(&req->base, err); + else { + local_bh_disable(); + rctx->complete(&req->base, err); + local_bh_enable(); + } + + /* check to see if there are other jobs that are done */ + sha_ctx = sha256_ctx_mgr_get_comp_ctx(cstate->mgr); + while (sha_ctx) { + req_ctx = cast_hash_to_mcryptd_ctx(sha_ctx); + ret = sha_finish_walk(&req_ctx, cstate, false); + if (req_ctx) { + spin_lock(&cstate->work_lock); + list_del(&req_ctx->waiter); + spin_unlock(&cstate->work_lock); + + req = cast_mcryptd_ctx_to_req(req_ctx); + if (irqs_disabled()) + rctx->complete(&req->base, ret); + else { + local_bh_disable(); + rctx->complete(&req->base, ret); + local_bh_enable(); + } + } + sha_ctx = sha256_ctx_mgr_get_comp_ctx(cstate->mgr); + } + + return 0; +} + +static void sha256_mb_add_list(struct mcryptd_hash_request_ctx *rctx, + struct mcryptd_alg_cstate *cstate) +{ + unsigned long next_flush; + unsigned long delay = usecs_to_jiffies(FLUSH_INTERVAL); + + /* initialize tag */ + rctx->tag.arrival = jiffies; /* tag the arrival time */ + rctx->tag.seq_num = cstate->next_seq_num++; + next_flush = rctx->tag.arrival + delay; + rctx->tag.expire = next_flush; + + spin_lock(&cstate->work_lock); + list_add_tail(&rctx->waiter, &cstate->work_list); + spin_unlock(&cstate->work_lock); + + mcryptd_arm_flusher(cstate, delay); +} + +static int sha256_mb_update(struct ahash_request *areq) +{ + struct mcryptd_hash_request_ctx *rctx = + container_of(areq, struct mcryptd_hash_request_ctx, areq); + struct mcryptd_alg_cstate *cstate = + this_cpu_ptr(sha256_mb_alg_state.alg_cstate); + + struct ahash_request *req = cast_mcryptd_ctx_to_req(rctx); + struct sha256_hash_ctx *sha_ctx; + int ret = 0, nbytes; + + /* sanity check */ + if (rctx->tag.cpu != smp_processor_id()) { + pr_err("mcryptd error: cpu clash\n"); + goto done; + } + + /* need to init context */ + req_ctx_init(rctx, areq); + + nbytes = crypto_ahash_walk_first(req, &rctx->walk); + + if (nbytes < 0) { + ret = nbytes; + goto done; + } + + if (crypto_ahash_walk_last(&rctx->walk)) + rctx->flag |= HASH_DONE; + + /* submit */ + sha_ctx = (struct sha256_hash_ctx *) ahash_request_ctx(areq); + sha256_mb_add_list(rctx, cstate); + kernel_fpu_begin(); + sha_ctx = sha256_ctx_mgr_submit(cstate->mgr, sha_ctx, rctx->walk.data, + nbytes, HASH_UPDATE); + kernel_fpu_end(); + + /* check if anything is returned */ + if (!sha_ctx) + return -EINPROGRESS; + + if (sha_ctx->error) { + ret = sha_ctx->error; + rctx = cast_hash_to_mcryptd_ctx(sha_ctx); + goto done; + } + + rctx = cast_hash_to_mcryptd_ctx(sha_ctx); + ret = sha_finish_walk(&rctx, cstate, false); + + if (!rctx) + return -EINPROGRESS; +done: + sha_complete_job(rctx, cstate, ret); + return ret; +} + +static int sha256_mb_finup(struct ahash_request *areq) +{ + struct mcryptd_hash_request_ctx *rctx = + container_of(areq, struct mcryptd_hash_request_ctx, areq); + struct mcryptd_alg_cstate *cstate = + this_cpu_ptr(sha256_mb_alg_state.alg_cstate); + + struct ahash_request *req = cast_mcryptd_ctx_to_req(rctx); + struct sha256_hash_ctx *sha_ctx; + int ret = 0, flag = HASH_UPDATE, nbytes; + + /* sanity check */ + if (rctx->tag.cpu != smp_processor_id()) { + pr_err("mcryptd error: cpu clash\n"); + goto done; + } + + /* need to init context */ + req_ctx_init(rctx, areq); + + nbytes = crypto_ahash_walk_first(req, &rctx->walk); + + if (nbytes < 0) { + ret = nbytes; + goto done; + } + + if (crypto_ahash_walk_last(&rctx->walk)) { + rctx->flag |= HASH_DONE; + flag = HASH_LAST; + } + + /* submit */ + rctx->flag |= HASH_FINAL; + sha_ctx = (struct sha256_hash_ctx *) ahash_request_ctx(areq); + sha256_mb_add_list(rctx, cstate); + + kernel_fpu_begin(); + sha_ctx = sha256_ctx_mgr_submit(cstate->mgr, sha_ctx, rctx->walk.data, + nbytes, flag); + kernel_fpu_end(); + + /* check if anything is returned */ + if (!sha_ctx) + return -EINPROGRESS; + + if (sha_ctx->error) { + ret = sha_ctx->error; + goto done; + } + + rctx = cast_hash_to_mcryptd_ctx(sha_ctx); + ret = sha_finish_walk(&rctx, cstate, false); + if (!rctx) + return -EINPROGRESS; +done: + sha_complete_job(rctx, cstate, ret); + return ret; +} + +static int sha256_mb_final(struct ahash_request *areq) +{ + struct mcryptd_hash_request_ctx *rctx = + container_of(areq, struct mcryptd_hash_request_ctx, + areq); + struct mcryptd_alg_cstate *cstate = + this_cpu_ptr(sha256_mb_alg_state.alg_cstate); + + struct sha256_hash_ctx *sha_ctx; + int ret = 0; + u8 data; + + /* sanity check */ + if (rctx->tag.cpu != smp_processor_id()) { + pr_err("mcryptd error: cpu clash\n"); + goto done; + } + + /* need to init context */ + req_ctx_init(rctx, areq); + + rctx->flag |= HASH_DONE | HASH_FINAL; + + sha_ctx = (struct sha256_hash_ctx *) ahash_request_ctx(areq); + /* flag HASH_FINAL and 0 data size */ + sha256_mb_add_list(rctx, cstate); + kernel_fpu_begin(); + sha_ctx = sha256_ctx_mgr_submit(cstate->mgr, sha_ctx, &data, 0, + HASH_LAST); + kernel_fpu_end(); + + /* check if anything is returned */ + if (!sha_ctx) + return -EINPROGRESS; + + if (sha_ctx->error) { + ret = sha_ctx->error; + rctx = cast_hash_to_mcryptd_ctx(sha_ctx); + goto done; + } + + rctx = cast_hash_to_mcryptd_ctx(sha_ctx); + ret = sha_finish_walk(&rctx, cstate, false); + if (!rctx) + return -EINPROGRESS; +done: + sha_complete_job(rctx, cstate, ret); + return ret; +} + +static int sha256_mb_export(struct ahash_request *areq, void *out) +{ + struct sha256_hash_ctx *sctx = ahash_request_ctx(areq); + + memcpy(out, sctx, sizeof(*sctx)); + + return 0; +} + +static int sha256_mb_import(struct ahash_request *areq, const void *in) +{ + struct sha256_hash_ctx *sctx = ahash_request_ctx(areq); + + memcpy(sctx, in, sizeof(*sctx)); + + return 0; +} + +static int sha256_mb_async_init_tfm(struct crypto_tfm *tfm) +{ + struct mcryptd_ahash *mcryptd_tfm; + struct sha256_mb_ctx *ctx = crypto_tfm_ctx(tfm); + struct mcryptd_hash_ctx *mctx; + + mcryptd_tfm = mcryptd_alloc_ahash("__intel_sha256-mb", + CRYPTO_ALG_INTERNAL, + CRYPTO_ALG_INTERNAL); + if (IS_ERR(mcryptd_tfm)) + return PTR_ERR(mcryptd_tfm); + mctx = crypto_ahash_ctx(&mcryptd_tfm->base); + mctx->alg_state = &sha256_mb_alg_state; + ctx->mcryptd_tfm = mcryptd_tfm; + crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), + sizeof(struct ahash_request) + + crypto_ahash_reqsize(&mcryptd_tfm->base)); + + return 0; +} + +static void sha256_mb_async_exit_tfm(struct crypto_tfm *tfm) +{ + struct sha256_mb_ctx *ctx = crypto_tfm_ctx(tfm); + + mcryptd_free_ahash(ctx->mcryptd_tfm); +} + +static int sha256_mb_areq_init_tfm(struct crypto_tfm *tfm) +{ + crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), + sizeof(struct ahash_request) + + sizeof(struct sha256_hash_ctx)); + + return 0; +} + +static void sha256_mb_areq_exit_tfm(struct crypto_tfm *tfm) +{ + struct sha256_mb_ctx *ctx = crypto_tfm_ctx(tfm); + + mcryptd_free_ahash(ctx->mcryptd_tfm); +} + +static struct ahash_alg sha256_mb_areq_alg = { + .init = sha256_mb_init, + .update = sha256_mb_update, + .final = sha256_mb_final, + .finup = sha256_mb_finup, + .export = sha256_mb_export, + .import = sha256_mb_import, + .halg = { + .digestsize = SHA256_DIGEST_SIZE, + .statesize = sizeof(struct sha256_hash_ctx), + .base = { + .cra_name = "__sha256-mb", + .cra_driver_name = "__intel_sha256-mb", + .cra_priority = 100, + /* + * use ASYNC flag as some buffers in multi-buffer + * algo may not have completed before hashing thread + * sleep + */ + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_INTERNAL, + .cra_blocksize = SHA256_BLOCK_SIZE, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT + (sha256_mb_areq_alg.halg.base.cra_list), + .cra_init = sha256_mb_areq_init_tfm, + .cra_exit = sha256_mb_areq_exit_tfm, + .cra_ctxsize = sizeof(struct sha256_hash_ctx), + } + } +}; + +static int sha256_mb_async_init(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct sha256_mb_ctx *ctx = crypto_ahash_ctx(tfm); + struct ahash_request *mcryptd_req = ahash_request_ctx(req); + struct mcryptd_ahash *mcryptd_tfm = ctx->mcryptd_tfm; + + memcpy(mcryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(mcryptd_req, &mcryptd_tfm->base); + return crypto_ahash_init(mcryptd_req); +} + +static int sha256_mb_async_update(struct ahash_request *req) +{ + struct ahash_request *mcryptd_req = ahash_request_ctx(req); + + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct sha256_mb_ctx *ctx = crypto_ahash_ctx(tfm); + struct mcryptd_ahash *mcryptd_tfm = ctx->mcryptd_tfm; + + memcpy(mcryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(mcryptd_req, &mcryptd_tfm->base); + return crypto_ahash_update(mcryptd_req); +} + +static int sha256_mb_async_finup(struct ahash_request *req) +{ + struct ahash_request *mcryptd_req = ahash_request_ctx(req); + + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct sha256_mb_ctx *ctx = crypto_ahash_ctx(tfm); + struct mcryptd_ahash *mcryptd_tfm = ctx->mcryptd_tfm; + + memcpy(mcryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(mcryptd_req, &mcryptd_tfm->base); + return crypto_ahash_finup(mcryptd_req); +} + +static int sha256_mb_async_final(struct ahash_request *req) +{ + struct ahash_request *mcryptd_req = ahash_request_ctx(req); + + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct sha256_mb_ctx *ctx = crypto_ahash_ctx(tfm); + struct mcryptd_ahash *mcryptd_tfm = ctx->mcryptd_tfm; + + memcpy(mcryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(mcryptd_req, &mcryptd_tfm->base); + return crypto_ahash_final(mcryptd_req); +} + +static int sha256_mb_async_digest(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct sha256_mb_ctx *ctx = crypto_ahash_ctx(tfm); + struct ahash_request *mcryptd_req = ahash_request_ctx(req); + struct mcryptd_ahash *mcryptd_tfm = ctx->mcryptd_tfm; + + memcpy(mcryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(mcryptd_req, &mcryptd_tfm->base); + return crypto_ahash_digest(mcryptd_req); +} + +static int sha256_mb_async_export(struct ahash_request *req, void *out) +{ + struct ahash_request *mcryptd_req = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct sha256_mb_ctx *ctx = crypto_ahash_ctx(tfm); + struct mcryptd_ahash *mcryptd_tfm = ctx->mcryptd_tfm; + + memcpy(mcryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(mcryptd_req, &mcryptd_tfm->base); + return crypto_ahash_export(mcryptd_req, out); +} + +static int sha256_mb_async_import(struct ahash_request *req, const void *in) +{ + struct ahash_request *mcryptd_req = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct sha256_mb_ctx *ctx = crypto_ahash_ctx(tfm); + struct mcryptd_ahash *mcryptd_tfm = ctx->mcryptd_tfm; + struct crypto_ahash *child = mcryptd_ahash_child(mcryptd_tfm); + struct mcryptd_hash_request_ctx *rctx; + struct ahash_request *areq; + + memcpy(mcryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(mcryptd_req, &mcryptd_tfm->base); + rctx = ahash_request_ctx(mcryptd_req); + areq = &rctx->areq; + + ahash_request_set_tfm(areq, child); + ahash_request_set_callback(areq, CRYPTO_TFM_REQ_MAY_SLEEP, + rctx->complete, req); + + return crypto_ahash_import(mcryptd_req, in); +} + +static struct ahash_alg sha256_mb_async_alg = { + .init = sha256_mb_async_init, + .update = sha256_mb_async_update, + .final = sha256_mb_async_final, + .finup = sha256_mb_async_finup, + .export = sha256_mb_async_export, + .import = sha256_mb_async_import, + .digest = sha256_mb_async_digest, + .halg = { + .digestsize = SHA256_DIGEST_SIZE, + .statesize = sizeof(struct sha256_hash_ctx), + .base = { + .cra_name = "sha256", + .cra_driver_name = "sha256_mb", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC, + .cra_blocksize = SHA256_BLOCK_SIZE, + .cra_type = &crypto_ahash_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT + (sha256_mb_async_alg.halg.base.cra_list), + .cra_init = sha256_mb_async_init_tfm, + .cra_exit = sha256_mb_async_exit_tfm, + .cra_ctxsize = sizeof(struct sha256_mb_ctx), + .cra_alignmask = 0, + }, + }, +}; + +static unsigned long sha256_mb_flusher(struct mcryptd_alg_cstate *cstate) +{ + struct mcryptd_hash_request_ctx *rctx; + unsigned long cur_time; + unsigned long next_flush = 0; + struct sha256_hash_ctx *sha_ctx; + + + cur_time = jiffies; + + while (!list_empty(&cstate->work_list)) { + rctx = list_entry(cstate->work_list.next, + struct mcryptd_hash_request_ctx, waiter); + if (time_before(cur_time, rctx->tag.expire)) + break; + kernel_fpu_begin(); + sha_ctx = (struct sha256_hash_ctx *) + sha256_ctx_mgr_flush(cstate->mgr); + kernel_fpu_end(); + if (!sha_ctx) { + pr_err("sha256_mb error: nothing got" + " flushed for non-empty list\n"); + break; + } + rctx = cast_hash_to_mcryptd_ctx(sha_ctx); + sha_finish_walk(&rctx, cstate, true); + sha_complete_job(rctx, cstate, 0); + } + + if (!list_empty(&cstate->work_list)) { + rctx = list_entry(cstate->work_list.next, + struct mcryptd_hash_request_ctx, waiter); + /* get the hash context and then flush time */ + next_flush = rctx->tag.expire; + mcryptd_arm_flusher(cstate, get_delay(next_flush)); + } + return next_flush; +} + +static int __init sha256_mb_mod_init(void) +{ + + int cpu; + int err; + struct mcryptd_alg_cstate *cpu_state; + + /* check for dependent cpu features */ + if (!boot_cpu_has(X86_FEATURE_AVX2) || + !boot_cpu_has(X86_FEATURE_BMI2)) + return -ENODEV; + + /* initialize multibuffer structures */ + sha256_mb_alg_state.alg_cstate = alloc_percpu + (struct mcryptd_alg_cstate); + + sha256_job_mgr_init = sha256_mb_mgr_init_avx2; + sha256_job_mgr_submit = sha256_mb_mgr_submit_avx2; + sha256_job_mgr_flush = sha256_mb_mgr_flush_avx2; + sha256_job_mgr_get_comp_job = sha256_mb_mgr_get_comp_job_avx2; + + if (!sha256_mb_alg_state.alg_cstate) + return -ENOMEM; + for_each_possible_cpu(cpu) { + cpu_state = per_cpu_ptr(sha256_mb_alg_state.alg_cstate, cpu); + cpu_state->next_flush = 0; + cpu_state->next_seq_num = 0; + cpu_state->flusher_engaged = false; + INIT_DELAYED_WORK(&cpu_state->flush, mcryptd_flusher); + cpu_state->cpu = cpu; + cpu_state->alg_state = &sha256_mb_alg_state; + cpu_state->mgr = kzalloc(sizeof(struct sha256_ctx_mgr), + GFP_KERNEL); + if (!cpu_state->mgr) + goto err2; + sha256_ctx_mgr_init(cpu_state->mgr); + INIT_LIST_HEAD(&cpu_state->work_list); + spin_lock_init(&cpu_state->work_lock); + } + sha256_mb_alg_state.flusher = &sha256_mb_flusher; + + err = crypto_register_ahash(&sha256_mb_areq_alg); + if (err) + goto err2; + err = crypto_register_ahash(&sha256_mb_async_alg); + if (err) + goto err1; + + + return 0; +err1: + crypto_unregister_ahash(&sha256_mb_areq_alg); +err2: + for_each_possible_cpu(cpu) { + cpu_state = per_cpu_ptr(sha256_mb_alg_state.alg_cstate, cpu); + kfree(cpu_state->mgr); + } + free_percpu(sha256_mb_alg_state.alg_cstate); + return -ENODEV; +} + +static void __exit sha256_mb_mod_fini(void) +{ + int cpu; + struct mcryptd_alg_cstate *cpu_state; + + crypto_unregister_ahash(&sha256_mb_async_alg); + crypto_unregister_ahash(&sha256_mb_areq_alg); + for_each_possible_cpu(cpu) { + cpu_state = per_cpu_ptr(sha256_mb_alg_state.alg_cstate, cpu); + kfree(cpu_state->mgr); + } + free_percpu(sha256_mb_alg_state.alg_cstate); +} + +module_init(sha256_mb_mod_init); +module_exit(sha256_mb_mod_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm, multi buffer accelerated"); + +MODULE_ALIAS_CRYPTO("sha256"); |