/*
 * Handle async block request by crypto hardware engine.
 *
 * Copyright (C) 2016 Linaro, Inc.
 *
 * Author: Baolin Wang <baolin.wang@linaro.org>
 *
 * 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; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <linux/err.h>
#include <linux/delay.h>
#include <crypto/engine.h>
#include <uapi/linux/sched/types.h>
#include "internal.h"

#define CRYPTO_ENGINE_MAX_QLEN 10

/**
 * crypto_finalize_request - finalize one request if the request is done
 * @engine: the hardware engine
 * @req: the request need to be finalized
 * @err: error number
 */
static void crypto_finalize_request(struct crypto_engine *engine,
                             struct crypto_async_request *req, int err)
{
        unsigned long flags;
        bool finalize_cur_req = false;
        int ret;
        struct crypto_engine_ctx *enginectx;

        spin_lock_irqsave(&engine->queue_lock, flags);
        if (engine->cur_req == req)
                finalize_cur_req = true;
        spin_unlock_irqrestore(&engine->queue_lock, flags);

        if (finalize_cur_req) {
                enginectx = crypto_tfm_ctx(req->tfm);
                if (engine->cur_req_prepared &&
                    enginectx->op.unprepare_request) {
                        ret = enginectx->op.unprepare_request(engine, req);
                        if (ret)
                                dev_err(engine->dev, "failed to unprepare request\n");
                }
                spin_lock_irqsave(&engine->queue_lock, flags);
                engine->cur_req = NULL;
                engine->cur_req_prepared = false;
                spin_unlock_irqrestore(&engine->queue_lock, flags);
        }

        req->complete(req, err);

        kthread_queue_work(engine->kworker, &engine->pump_requests);
}

/**
 * crypto_pump_requests - dequeue one request from engine queue to process
 * @engine: the hardware engine
 * @in_kthread: true if we are in the context of the request pump thread
 *
 * This function checks if there is any request in the engine queue that
 * needs processing and if so call out to the driver to initialize hardware
 * and handle each request.
 */
static void crypto_pump_requests(struct crypto_engine *engine,
                                 bool in_kthread)
{
        struct crypto_async_request *async_req, *backlog;
        unsigned long flags;
        bool was_busy = false;
        int ret;
        struct crypto_engine_ctx *enginectx;

        spin_lock_irqsave(&engine->queue_lock, flags);

        /* Make sure we are not already running a request */
        if (engine->cur_req)
                goto out;

        /* If another context is idling then defer */
        if (engine->idling) {
                kthread_queue_work(engine->kworker, &engine->pump_requests);
                goto out;
        }

        /* Check if the engine queue is idle */
        if (!crypto_queue_len(&engine->queue) || !engine->running) {
                if (!engine->busy)
                        goto out;

                /* Only do teardown in the thread */
                if (!in_kthread) {
                        kthread_queue_work(engine->kworker,
                                           &engine->pump_requests);
                        goto out;
                }

                engine->busy = false;
                engine->idling = true;
                spin_unlock_irqrestore(&engine->queue_lock, flags);

                if (engine->unprepare_crypt_hardware &&
                    engine->unprepare_crypt_hardware(engine))
                        dev_err(engine->dev, "failed to unprepare crypt hardware\n");

                spin_lock_irqsave(&engine->queue_lock, flags);
                engine->idling = false;
                goto out;
        }

        /* Get the fist request from the engine queue to handle */
        backlog = crypto_get_backlog(&engine->queue);
        async_req = crypto_dequeue_request(&engine->queue);
        if (!async_req)
                goto out;

        engine->cur_req = async_req;
        if (backlog)
                backlog->complete(backlog, -EINPROGRESS);

        if (engine->busy)
                was_busy = true;
        else
                engine->busy = true;

        spin_unlock_irqrestore(&engine->queue_lock, flags);

        /* Until here we get the request need to be encrypted successfully */
        if (!was_busy && engine->prepare_crypt_hardware) {
                ret = engine->prepare_crypt_hardware(engine);
                if (ret) {
                        dev_err(engine->dev, "failed to prepare crypt hardware\n");
                        goto req_err;
                }
        }

        enginectx = crypto_tfm_ctx(async_req->tfm);

        if (enginectx->op.prepare_request) {
                ret = enginectx->op.prepare_request(engine, async_req);
                if (ret) {
                        dev_err(engine->dev, "failed to prepare request: %d\n",
                                ret);
                        goto req_err;
                }
                engine->cur_req_prepared = true;
        }
        if (!enginectx->op.do_one_request) {
                dev_err(engine->dev, "failed to do request\n");
                ret = -EINVAL;
                goto req_err;
        }
        ret = enginectx->op.do_one_request(engine, async_req);
        if (ret) {
                dev_err(engine->dev, "Failed to do one request from queue: %d\n", ret);
                goto req_err;
        }
        return;

req_err:
        crypto_finalize_request(engine, async_req, ret);
        return;

out:
        spin_unlock_irqrestore(&engine->queue_lock, flags);
}

static void crypto_pump_work(struct kthread_work *work)
{
        struct crypto_engine *engine =
                container_of(work, struct crypto_engine, pump_requests);

        crypto_pump_requests(engine, true);
}

/**
 * crypto_transfer_request - transfer the new request into the engine queue
 * @engine: the hardware engine
 * @req: the request need to be listed into the engine queue
 */
static int crypto_transfer_request(struct crypto_engine *engine,
                                   struct crypto_async_request *req,
                                   bool need_pump)
{
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&engine->queue_lock, flags);

        if (!engine->running) {
                spin_unlock_irqrestore(&engine->queue_lock, flags);
                return -ESHUTDOWN;
        }

        ret = crypto_enqueue_request(&engine->queue, req);

        if (!engine->busy && need_pump)
                kthread_queue_work(engine->kworker, &engine->pump_requests);

        spin_unlock_irqrestore(&engine->queue_lock, flags);
        return ret;
}

/**
 * crypto_transfer_request_to_engine - transfer one request to list
 * into the engine queue
 * @engine: the hardware engine
 * @req: the request need to be listed into the engine queue
 */
static int crypto_transfer_request_to_engine(struct crypto_engine *engine,
                                             struct crypto_async_request *req)
{
        return crypto_transfer_request(engine, req, true);
}

/**
 * crypto_transfer_ablkcipher_request_to_engine - transfer one ablkcipher_request
 * to list into the engine queue
 * @engine: the hardware engine
 * @req: the request need to be listed into the engine queue
 * TODO: Remove this function when skcipher conversion is finished
 */
int crypto_transfer_ablkcipher_request_to_engine(struct crypto_engine *engine,
                                                 struct ablkcipher_request *req)
{
        return crypto_transfer_request_to_engine(engine, &req->base);
}
EXPORT_SYMBOL_GPL(crypto_transfer_ablkcipher_request_to_engine);

/**
 * crypto_transfer_aead_request_to_engine - transfer one aead_request
 * to list into the engine queue
 * @engine: the hardware engine
 * @req: the request need to be listed into the engine queue
 */
int crypto_transfer_aead_request_to_engine(struct crypto_engine *engine,
                                           struct aead_request *req)
{
        return crypto_transfer_request_to_engine(engine, &req->base);
}
EXPORT_SYMBOL_GPL(crypto_transfer_aead_request_to_engine);

/**
 * crypto_transfer_akcipher_request_to_engine - transfer one akcipher_request
 * to list into the engine queue
 * @engine: the hardware engine
 * @req: the request need to be listed into the engine queue
 */
int crypto_transfer_akcipher_request_to_engine(struct crypto_engine *engine,
                                               struct akcipher_request *req)
{
        return crypto_transfer_request_to_engine(engine, &req->base);
}
EXPORT_SYMBOL_GPL(crypto_transfer_akcipher_request_to_engine);

/**
 * crypto_transfer_hash_request_to_engine - transfer one ahash_request
 * to list into the engine queue
 * @engine: the hardware engine
 * @req: the request need to be listed into the engine queue
 */
int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine,
                                           struct ahash_request *req)
{
        return crypto_transfer_request_to_engine(engine, &req->base);
}
EXPORT_SYMBOL_GPL(crypto_transfer_hash_request_to_engine);

/**
 * crypto_transfer_skcipher_request_to_engine - transfer one skcipher_request
 * to list into the engine queue
 * @engine: the hardware engine
 * @req: the request need to be listed into the engine queue
 */
int crypto_transfer_skcipher_request_to_engine(struct crypto_engine *engine,
                                               struct skcipher_request *req)
{
        return crypto_transfer_request_to_engine(engine, &req->base);
}
EXPORT_SYMBOL_GPL(crypto_transfer_skcipher_request_to_engine);

/**
 * crypto_finalize_ablkcipher_request - finalize one ablkcipher_request if
 * the request is done
 * @engine: the hardware engine
 * @req: the request need to be finalized
 * @err: error number
 * TODO: Remove this function when skcipher conversion is finished
 */
void crypto_finalize_ablkcipher_request(struct crypto_engine *engine,
                                        struct ablkcipher_request *req, int err)
{
        return crypto_finalize_request(engine, &req->base, err);
}
EXPORT_SYMBOL_GPL(crypto_finalize_ablkcipher_request);

/**
 * crypto_finalize_aead_request - finalize one aead_request if
 * the request is done
 * @engine: the hardware engine
 * @req: the request need to be finalized
 * @err: error number
 */
void crypto_finalize_aead_request(struct crypto_engine *engine,
                                  struct aead_request *req, int err)
{
        return crypto_finalize_request(engine, &req->base, err);
}
EXPORT_SYMBOL_GPL(crypto_finalize_aead_request);

/**
 * crypto_finalize_akcipher_request - finalize one akcipher_request if
 * the request is done
 * @engine: the hardware engine
 * @req: the request need to be finalized
 * @err: error number
 */
void crypto_finalize_akcipher_request(struct crypto_engine *engine,
                                      struct akcipher_request *req, int err)
{
        return crypto_finalize_request(engine, &req->base, err);
}
EXPORT_SYMBOL_GPL(crypto_finalize_akcipher_request);

/**
 * crypto_finalize_hash_request - finalize one ahash_request if
 * the request is done
 * @engine: the hardware engine
 * @req: the request need to be finalized
 * @err: error number
 */
void crypto_finalize_hash_request(struct crypto_engine *engine,
                                  struct ahash_request *req, int err)
{
        return crypto_finalize_request(engine, &req->base, err);
}
EXPORT_SYMBOL_GPL(crypto_finalize_hash_request);

/**
 * crypto_finalize_skcipher_request - finalize one skcipher_request if
 * the request is done
 * @engine: the hardware engine
 * @req: the request need to be finalized
 * @err: error number
 */
void crypto_finalize_skcipher_request(struct crypto_engine *engine,
                                      struct skcipher_request *req, int err)
{
        return crypto_finalize_request(engine, &req->base, err);
}
EXPORT_SYMBOL_GPL(crypto_finalize_skcipher_request);

/**
 * crypto_engine_start - start the hardware engine
 * @engine: the hardware engine need to be started
 *
 * Return 0 on success, else on fail.
 */
int crypto_engine_start(struct crypto_engine *engine)
{
        unsigned long flags;

        spin_lock_irqsave(&engine->queue_lock, flags);

        if (engine->running || engine->busy) {
                spin_unlock_irqrestore(&engine->queue_lock, flags);
                return -EBUSY;
        }

        engine->running = true;
        spin_unlock_irqrestore(&engine->queue_lock, flags);

        kthread_queue_work(engine->kworker, &engine->pump_requests);

        return 0;
}
EXPORT_SYMBOL_GPL(crypto_engine_start);

/**
 * crypto_engine_stop - stop the hardware engine
 * @engine: the hardware engine need to be stopped
 *
 * Return 0 on success, else on fail.
 */
int crypto_engine_stop(struct crypto_engine *engine)
{
        unsigned long flags;
        unsigned int limit = 500;
        int ret = 0;

        spin_lock_irqsave(&engine->queue_lock, flags);

        /*
         * If the engine queue is not empty or the engine is on busy state,
         * we need to wait for a while to pump the requests of engine queue.
         */
        while ((crypto_queue_len(&engine->queue) || engine->busy) && limit--) {
                spin_unlock_irqrestore(&engine->queue_lock, flags);
                msleep(20);
                spin_lock_irqsave(&engine->queue_lock, flags);
        }

        if (crypto_queue_len(&engine->queue) || engine->busy)
                ret = -EBUSY;
        else
                engine->running = false;

        spin_unlock_irqrestore(&engine->queue_lock, flags);

        if (ret)
                dev_warn(engine->dev, "could not stop engine\n");

        return ret;
}
EXPORT_SYMBOL_GPL(crypto_engine_stop);

/**
 * crypto_engine_alloc_init - allocate crypto hardware engine structure and
 * initialize it.
 * @dev: the device attached with one hardware engine
 * @rt: whether this queue is set to run as a realtime task
 *
 * This must be called from context that can sleep.
 * Return: the crypto engine structure on success, else NULL.
 */
struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
{
        struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
        struct crypto_engine *engine;

        if (!dev)
                return NULL;

        engine = devm_kzalloc(dev, sizeof(*engine), GFP_KERNEL);
        if (!engine)
                return NULL;

        engine->dev = dev;
        engine->rt = rt;
        engine->running = false;
        engine->busy = false;
        engine->idling = false;
        engine->cur_req_prepared = false;
        engine->priv_data = dev;
        snprintf(engine->name, sizeof(engine->name),
                 "%s-engine", dev_name(dev));

        crypto_init_queue(&engine->queue, CRYPTO_ENGINE_MAX_QLEN);
        spin_lock_init(&engine->queue_lock);

        engine->kworker = kthread_create_worker(0, "%s", engine->name);
        if (IS_ERR(engine->kworker)) {
                dev_err(dev, "failed to create crypto request pump task\n");
                return NULL;
        }
        kthread_init_work(&engine->pump_requests, crypto_pump_work);

        if (engine->rt) {
                dev_info(dev, "will run requests pump with realtime priority\n");
                sched_setscheduler(engine->kworker->task, SCHED_FIFO, &param);
        }

        return engine;
}
EXPORT_SYMBOL_GPL(crypto_engine_alloc_init);

/**
 * crypto_engine_exit - free the resources of hardware engine when exit
 * @engine: the hardware engine need to be freed
 *
 * Return 0 for success.
 */
int crypto_engine_exit(struct crypto_engine *engine)
{
        int ret;

        ret = crypto_engine_stop(engine);
        if (ret)
                return ret;

        kthread_destroy_worker(engine->kworker);

        return 0;
}
EXPORT_SYMBOL_GPL(crypto_engine_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Crypto hardware engine framework");