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![Ingo Molnar](/assets/img/avatar_default.png)
We are going to move scheduler ABI details to <uapi/linux/sched/types.h>, which will be used from a number of .c files. Create empty placeholder header that maps to <linux/types.h>. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
463 lines
12 KiB
C
463 lines
12 KiB
C
/*
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* Handle async block request by crypto hardware engine.
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*
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* Copyright (C) 2016 Linaro, Inc.
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*
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* Author: Baolin Wang <baolin.wang@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <crypto/engine.h>
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#include <crypto/internal/hash.h>
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#include <uapi/linux/sched/types.h>
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#include "internal.h"
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#define CRYPTO_ENGINE_MAX_QLEN 10
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/**
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* crypto_pump_requests - dequeue one request from engine queue to process
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* @engine: the hardware engine
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* @in_kthread: true if we are in the context of the request pump thread
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*
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* This function checks if there is any request in the engine queue that
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* needs processing and if so call out to the driver to initialize hardware
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* and handle each request.
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*/
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static void crypto_pump_requests(struct crypto_engine *engine,
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bool in_kthread)
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{
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struct crypto_async_request *async_req, *backlog;
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struct ahash_request *hreq;
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struct ablkcipher_request *breq;
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unsigned long flags;
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bool was_busy = false;
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int ret, rtype;
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spin_lock_irqsave(&engine->queue_lock, flags);
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/* Make sure we are not already running a request */
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if (engine->cur_req)
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goto out;
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/* If another context is idling then defer */
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if (engine->idling) {
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kthread_queue_work(engine->kworker, &engine->pump_requests);
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goto out;
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}
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/* Check if the engine queue is idle */
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if (!crypto_queue_len(&engine->queue) || !engine->running) {
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if (!engine->busy)
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goto out;
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/* Only do teardown in the thread */
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if (!in_kthread) {
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kthread_queue_work(engine->kworker,
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&engine->pump_requests);
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goto out;
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}
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engine->busy = false;
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engine->idling = true;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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if (engine->unprepare_crypt_hardware &&
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engine->unprepare_crypt_hardware(engine))
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pr_err("failed to unprepare crypt hardware\n");
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spin_lock_irqsave(&engine->queue_lock, flags);
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engine->idling = false;
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goto out;
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}
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/* Get the fist request from the engine queue to handle */
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backlog = crypto_get_backlog(&engine->queue);
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async_req = crypto_dequeue_request(&engine->queue);
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if (!async_req)
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goto out;
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engine->cur_req = async_req;
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if (backlog)
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backlog->complete(backlog, -EINPROGRESS);
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if (engine->busy)
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was_busy = true;
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else
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engine->busy = true;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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rtype = crypto_tfm_alg_type(engine->cur_req->tfm);
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/* Until here we get the request need to be encrypted successfully */
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if (!was_busy && engine->prepare_crypt_hardware) {
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ret = engine->prepare_crypt_hardware(engine);
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if (ret) {
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pr_err("failed to prepare crypt hardware\n");
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goto req_err;
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}
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}
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switch (rtype) {
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case CRYPTO_ALG_TYPE_AHASH:
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hreq = ahash_request_cast(engine->cur_req);
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if (engine->prepare_hash_request) {
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ret = engine->prepare_hash_request(engine, hreq);
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if (ret) {
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pr_err("failed to prepare request: %d\n", ret);
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goto req_err;
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}
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engine->cur_req_prepared = true;
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}
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ret = engine->hash_one_request(engine, hreq);
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if (ret) {
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pr_err("failed to hash one request from queue\n");
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goto req_err;
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}
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return;
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case CRYPTO_ALG_TYPE_ABLKCIPHER:
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breq = ablkcipher_request_cast(engine->cur_req);
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if (engine->prepare_cipher_request) {
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ret = engine->prepare_cipher_request(engine, breq);
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if (ret) {
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pr_err("failed to prepare request: %d\n", ret);
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goto req_err;
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}
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engine->cur_req_prepared = true;
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}
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ret = engine->cipher_one_request(engine, breq);
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if (ret) {
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pr_err("failed to cipher one request from queue\n");
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goto req_err;
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}
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return;
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default:
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pr_err("failed to prepare request of unknown type\n");
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return;
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}
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req_err:
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switch (rtype) {
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case CRYPTO_ALG_TYPE_AHASH:
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hreq = ahash_request_cast(engine->cur_req);
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crypto_finalize_hash_request(engine, hreq, ret);
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break;
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case CRYPTO_ALG_TYPE_ABLKCIPHER:
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breq = ablkcipher_request_cast(engine->cur_req);
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crypto_finalize_cipher_request(engine, breq, ret);
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break;
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}
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return;
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out:
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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}
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static void crypto_pump_work(struct kthread_work *work)
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{
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struct crypto_engine *engine =
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container_of(work, struct crypto_engine, pump_requests);
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crypto_pump_requests(engine, true);
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}
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/**
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* crypto_transfer_cipher_request - transfer the new request into the
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* enginequeue
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* @engine: the hardware engine
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* @req: the request need to be listed into the engine queue
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*/
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int crypto_transfer_cipher_request(struct crypto_engine *engine,
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struct ablkcipher_request *req,
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bool need_pump)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&engine->queue_lock, flags);
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if (!engine->running) {
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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return -ESHUTDOWN;
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}
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ret = ablkcipher_enqueue_request(&engine->queue, req);
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if (!engine->busy && need_pump)
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kthread_queue_work(engine->kworker, &engine->pump_requests);
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_transfer_cipher_request);
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/**
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* crypto_transfer_cipher_request_to_engine - transfer one request to list
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* into the engine queue
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* @engine: the hardware engine
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* @req: the request need to be listed into the engine queue
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*/
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int crypto_transfer_cipher_request_to_engine(struct crypto_engine *engine,
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struct ablkcipher_request *req)
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{
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return crypto_transfer_cipher_request(engine, req, true);
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}
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EXPORT_SYMBOL_GPL(crypto_transfer_cipher_request_to_engine);
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/**
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* crypto_transfer_hash_request - transfer the new request into the
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* enginequeue
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* @engine: the hardware engine
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* @req: the request need to be listed into the engine queue
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*/
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int crypto_transfer_hash_request(struct crypto_engine *engine,
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struct ahash_request *req, bool need_pump)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&engine->queue_lock, flags);
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if (!engine->running) {
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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return -ESHUTDOWN;
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}
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ret = ahash_enqueue_request(&engine->queue, req);
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if (!engine->busy && need_pump)
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kthread_queue_work(engine->kworker, &engine->pump_requests);
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_transfer_hash_request);
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/**
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* crypto_transfer_hash_request_to_engine - transfer one request to list
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* into the engine queue
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* @engine: the hardware engine
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* @req: the request need to be listed into the engine queue
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*/
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int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine,
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struct ahash_request *req)
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{
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return crypto_transfer_hash_request(engine, req, true);
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}
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EXPORT_SYMBOL_GPL(crypto_transfer_hash_request_to_engine);
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/**
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* crypto_finalize_cipher_request - finalize one request if the request is done
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* @engine: the hardware engine
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* @req: the request need to be finalized
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* @err: error number
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*/
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void crypto_finalize_cipher_request(struct crypto_engine *engine,
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struct ablkcipher_request *req, int err)
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{
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unsigned long flags;
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bool finalize_cur_req = false;
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int ret;
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spin_lock_irqsave(&engine->queue_lock, flags);
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if (engine->cur_req == &req->base)
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finalize_cur_req = true;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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if (finalize_cur_req) {
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if (engine->cur_req_prepared &&
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engine->unprepare_cipher_request) {
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ret = engine->unprepare_cipher_request(engine, req);
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if (ret)
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pr_err("failed to unprepare request\n");
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}
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spin_lock_irqsave(&engine->queue_lock, flags);
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engine->cur_req = NULL;
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engine->cur_req_prepared = false;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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}
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req->base.complete(&req->base, err);
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kthread_queue_work(engine->kworker, &engine->pump_requests);
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}
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EXPORT_SYMBOL_GPL(crypto_finalize_cipher_request);
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/**
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* crypto_finalize_hash_request - finalize one request if the request is done
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* @engine: the hardware engine
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* @req: the request need to be finalized
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* @err: error number
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*/
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void crypto_finalize_hash_request(struct crypto_engine *engine,
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struct ahash_request *req, int err)
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{
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unsigned long flags;
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bool finalize_cur_req = false;
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int ret;
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spin_lock_irqsave(&engine->queue_lock, flags);
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if (engine->cur_req == &req->base)
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finalize_cur_req = true;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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if (finalize_cur_req) {
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if (engine->cur_req_prepared &&
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engine->unprepare_hash_request) {
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ret = engine->unprepare_hash_request(engine, req);
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if (ret)
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pr_err("failed to unprepare request\n");
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}
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spin_lock_irqsave(&engine->queue_lock, flags);
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engine->cur_req = NULL;
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engine->cur_req_prepared = false;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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}
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req->base.complete(&req->base, err);
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kthread_queue_work(engine->kworker, &engine->pump_requests);
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}
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EXPORT_SYMBOL_GPL(crypto_finalize_hash_request);
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/**
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* crypto_engine_start - start the hardware engine
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* @engine: the hardware engine need to be started
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*
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* Return 0 on success, else on fail.
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*/
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int crypto_engine_start(struct crypto_engine *engine)
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{
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unsigned long flags;
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spin_lock_irqsave(&engine->queue_lock, flags);
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if (engine->running || engine->busy) {
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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return -EBUSY;
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}
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engine->running = true;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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kthread_queue_work(engine->kworker, &engine->pump_requests);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_engine_start);
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/**
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* crypto_engine_stop - stop the hardware engine
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* @engine: the hardware engine need to be stopped
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*
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* Return 0 on success, else on fail.
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*/
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int crypto_engine_stop(struct crypto_engine *engine)
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{
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unsigned long flags;
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unsigned int limit = 500;
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int ret = 0;
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spin_lock_irqsave(&engine->queue_lock, flags);
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/*
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* If the engine queue is not empty or the engine is on busy state,
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* we need to wait for a while to pump the requests of engine queue.
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*/
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while ((crypto_queue_len(&engine->queue) || engine->busy) && limit--) {
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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msleep(20);
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spin_lock_irqsave(&engine->queue_lock, flags);
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}
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if (crypto_queue_len(&engine->queue) || engine->busy)
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ret = -EBUSY;
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else
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engine->running = false;
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spin_unlock_irqrestore(&engine->queue_lock, flags);
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if (ret)
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pr_warn("could not stop engine\n");
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_engine_stop);
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/**
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* crypto_engine_alloc_init - allocate crypto hardware engine structure and
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* initialize it.
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* @dev: the device attached with one hardware engine
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* @rt: whether this queue is set to run as a realtime task
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*
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* This must be called from context that can sleep.
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* Return: the crypto engine structure on success, else NULL.
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*/
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struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
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{
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struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
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struct crypto_engine *engine;
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if (!dev)
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return NULL;
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engine = devm_kzalloc(dev, sizeof(*engine), GFP_KERNEL);
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if (!engine)
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return NULL;
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engine->rt = rt;
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engine->running = false;
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engine->busy = false;
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engine->idling = false;
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engine->cur_req_prepared = false;
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engine->priv_data = dev;
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snprintf(engine->name, sizeof(engine->name),
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"%s-engine", dev_name(dev));
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crypto_init_queue(&engine->queue, CRYPTO_ENGINE_MAX_QLEN);
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spin_lock_init(&engine->queue_lock);
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engine->kworker = kthread_create_worker(0, "%s", engine->name);
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if (IS_ERR(engine->kworker)) {
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dev_err(dev, "failed to create crypto request pump task\n");
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return NULL;
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}
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kthread_init_work(&engine->pump_requests, crypto_pump_work);
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if (engine->rt) {
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dev_info(dev, "will run requests pump with realtime priority\n");
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sched_setscheduler(engine->kworker->task, SCHED_FIFO, ¶m);
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}
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return engine;
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}
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EXPORT_SYMBOL_GPL(crypto_engine_alloc_init);
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/**
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* crypto_engine_exit - free the resources of hardware engine when exit
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* @engine: the hardware engine need to be freed
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*
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* Return 0 for success.
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*/
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int crypto_engine_exit(struct crypto_engine *engine)
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{
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int ret;
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ret = crypto_engine_stop(engine);
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if (ret)
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return ret;
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kthread_destroy_worker(engine->kworker);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_engine_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Crypto hardware engine framework");
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