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< / div > < div class = "- topic/body concept/conbody body conbody" > < section class = "- topic/section section" id = "ce_key_procedures__section_hhx_y1y_21c" data-ofbid = "ce_key_procedures__section_hhx_y1y_21c" > < h2 class = "- topic/title title sectiontitle" > 初始化流程< / h2 >
< figure class = "- topic/fig fig fignone" id = "ce_key_procedures__fig_mcc_1by_21c" data-ofbid = "ce_key_procedures__fig_mcc_1by_21c" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "ce_key_procedures__image_ihx_y1y_21c" src = "../../../images/ce/ce_keyflow.png" alt = "ce_keyflow" / > < / div > < br / > < figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 1< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > 初始化流程< / span > < / figcaption > < / figure >
< div class = "- topic/p p" data-ofbid = "d72614e34__20250121171523" > 相关的代码流程如下。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "ce_key_procedures__codeblock_uw1_bby_21c" data-ofbid = "ce_key_procedures__codeblock_uw1_bby_21c" > aic_crypto_probe(pdev);
|-> ce_dev-> base = devm_platform_ioremap_resource(pdev, < span class = "hl-number" > 0< / span > );
|-> ret = devm_request_threaded_irq(dev, irq, aic_crypto_irq_handler,
| aic_crypto_irq_thread, IRQF_ONESHOT,
| dev_name(dev), ce_dev);
|-> ce_dev-> clk = devm_clk_get(dev, NULL);
|-> clk_prepare_enable(ce_dev-> clk);
|-> ce_dev-> reset = devm_reset_control_get(dev, NULL);
|-> reset_control_assert(ce_dev-> reset);
|-> reset_control_deassert(ce_dev-> reset);
|-> aic_crypto_skcipher_accelerator_init(ce_dev);
| |-> eng = crypto_engine_alloc_init_and_set(ce-> dev, true, NULL, true,
| | ACCEL_QUEUE_MAX_SIZE);
| |-> kfifo_alloc(& ce-> sk_accel.req_fifo, ACCEL_QUEUE_MAX_SIZE, GFP_KERNEL);
| |-> crypto_engine_start(ce-> sk_accel.engine);
| |-> crypto_register_skcipher(& sk_algs[i].alg);
|
|-> aic_crypto_akcipher_accelerator_init(ce_dev);
|-> aic_crypto_hash_accelerator_init(ce_dev);< / pre > < / div >
< / section > < section class = "- topic/section section" id = "ce_key_procedures__section_khx_y1y_21c" data-ofbid = "ce_key_procedures__section_khx_y1y_21c" > < h2 class = "- topic/title title sectiontitle" > 数据处理流程< / h2 >
< p class = "- topic/p p" data-ofbid = "d72614e44__20250121171523" > 由于 CE 中几种类型算法的数据处理流程相似，这里仅以对称密钥算法的数据处理流程为例进行说明。< / p >
< p class = "- topic/p p" data-ofbid = "d72614e47__20250121171523" > 在处理步骤上，各种算法都遵循标准化的几个步骤：< / p >
< ol class = "- topic/ol ol" id = "ce_key_procedures__ol_mhx_y1y_21c" data-ofbid = "ce_key_procedures__ol_mhx_y1y_21c" > < li class = "- topic/li li" data-ofbid = "d72614e51__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e53__20250121171523" > 从 Crypto Core 层将处理请求传递给 CE 算法< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e56__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e58__20250121171523" > CE 算法处理函数将请求转交给(transfer)给对应加速器的 crypto_engine 队列< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e61__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e63__20250121171523" > crypto_engine 中的处理线程从队列中取出请求，调用对应的 prepare/do_one_req 进行处理< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e66__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e68__20250121171523" > do_one_req 回调函数中，将对应的请求交给硬件处理< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e71__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e73__20250121171523" > 在中断处理函数中，取出结果，返回给调用者< / p >
< / li > < / ol >
< div class = "- topic/p p" data-ofbid = "d72614e77__20250121171523" > 对称密钥算法的具体处理调用流程如下所示。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "ce_key_procedures__codeblock_exp_bby_21c" data-ofbid = "ce_key_procedures__codeblock_exp_bby_21c" > aic_skcipher_aes_ecb_encrypt(req);
|-> aic_skcipher_crypt(req, FLG_AES | FLG_ECB);
|-> crypto_transfer_skcipher_request_to_engine(eng, req);
crypto_engine
|-> aic_skcipher_prepare_req(engine, req);
|-> aic_skcipher_do_one_req(engine, req);
|-> aic_crypto_enqueue_task(ce, algo, rctx-> phy_task);
aic_crypto_irq_thread(< strong class = "hl-keyword" > int< / strong > irq, < strong class = "hl-keyword" > void< / strong > *arg);
|-> aic_skcipher_handle_irq(ce_dev);
|-> crypto_finalize_skcipher_request(ce-> sk_accel.engine, req, err);
|-> aic_skcipher_unprepare_req(engine, req);
|-> req.complete(req, err);< / pre > < / div >
< p class = "- topic/p p" data-ofbid = "d72614e83__20250121171523" > 除了上述的大处理流程，还有一个关键点需要注意，就是 < strong class = "+ topic/ph hi-d/b ph b" > 数据的对齐处理< / strong > 。用户发起数据处理请求时， 提供了输入和输出的数据缓冲区，然而这些数据缓冲区对 CE
而言有两个问题：< / p >
< ol class = "- topic/ol ol" id = "ce_key_procedures__ol_phx_y1y_21c" data-ofbid = "ce_key_procedures__ol_phx_y1y_21c" > < li class = "- topic/li li" data-ofbid = "d72614e90__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e92__20250121171523" > 这些缓冲区是虚拟地址空间的内存，并不一定是物理连续的内存空间< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e95__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e97__20250121171523" > 缓冲区的开始地址并不一定是对齐的，不一定满足 CE 的地址对齐要求< / p >
< / li > < / ol >
< p class = "- topic/p p" data-ofbid = "d72614e101__20250121171523" > 因此需要对输入和输出的数据做一些处理。< / p >
< p class = "- topic/p p" data-ofbid = "d72614e104__20250121171523" > 一个简单的处理方式是对输入和输出的数据，一律复制到驱动新申请的物理连续的缓冲区中， 使用该空间作为 CE 的硬件工作缓冲区，处理完成之后再复制到用户提供的输出缓冲区。
但是对每一笔数据都会有额外的两次数据拷贝操作，对于处理大量数据的应用场景，效率较低。< / p >
< p class = "- topic/p p" data-ofbid = "d72614e107__20250121171523" > 为了兼顾数据处理效率， < strong class = "+ topic/ph hi-d/b ph b" > 原则上尽量避免数据拷贝< / strong > 。< / p >
< ol class = "- topic/ol ol" id = "ce_key_procedures__ol_rhx_y1y_21c" data-ofbid = "ce_key_procedures__ol_rhx_y1y_21c" > < li class = "- topic/li li" data-ofbid = "d72614e114__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e116__20250121171523" > 输入缓冲区和输出缓冲区 CE 都无法使用< / p >
< p class = "- topic/p p" data-ofbid = "d72614e119__20250121171523" > 此种情况 CE 驱动为输入和输出缓冲区分配物理连续的工作缓冲区，并且需要对输入和输出数据进行复制。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e122__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e124__20250121171523" > 输入缓冲区 CE 可用，输出缓冲区 CE 不可用< / p >
< p class = "- topic/p p" data-ofbid = "d72614e127__20250121171523" > 此种情况 CE 驱动为输出缓冲区分配物理连续的工作缓冲区， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e130__20250121171523" >
< p class = "- topic/p p" data-ofbid = "d72614e132__20250121171523" > 输入缓冲区 CE 不可用，输出缓冲区 CE 可用< / p >
< p class = "- topic/p p" data-ofbid = "d72614e135__20250121171523" > 此种情况 CE 驱动为输入缓冲区分配物理连续的工作缓冲区， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d72614e138__20250121171523" > < p class = "- topic/p p" data-ofbid = "d72614e139__20250121171523" > 输入缓冲区和输出缓冲区都是 CE 可用< / p > < p class = "- topic/p p" data-ofbid = "d72614e141__20250121171523" > 此种情况效率最高， < / p > < div class = "- topic/p p" data-ofbid = "d72614e143__20250121171523" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "ce_key_procedures__image_shx_y1y_21c" src = "../../../images/ce/ce_data_buffer_for_ce.png" alt = "ce_data_buffer_for_ce" / > < / div > < br / > < / div > < / li > < / ol >
< p class = "- topic/p p" data-ofbid = "d72614e149__20250121171523" > 当用户处理大量数据时，为了提高系统的处理效率，应为输入和输出数据申请按页对齐的缓冲区，这样 CE 驱动可以直接使用，避免额外的复制操作。< / p >
< / section > < section class = "- topic/section section" id = "ce_key_procedures__section_thx_y1y_21c" data-ofbid = "ce_key_procedures__section_thx_y1y_21c" > < h2 class = "- topic/title title sectiontitle" > 中断处理流程< / h2 >
< p class = "- topic/p p" data-ofbid = "d72614e157__20250121171523" > CE 驱动的中断处理比较简单，采用线程化的 IRQ 处理方式实现。< / p >
< div class = "- topic/p p" data-ofbid = "d72614e160__20250121171523" > 当中断发生时，首先在 irq handler 函数中保存当前的 IRQ
状态寄存器和错误状态寄存器的值。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "ce_key_procedures__codeblock_z5z_cby_21c" data-ofbid = "ce_key_procedures__codeblock_z5z_cby_21c" > < strong class = "hl-keyword" > static< / strong > irqreturn_t aic_crypto_irq_handler(< strong class = "hl-keyword" > int< / strong > irq, < strong class = "hl-keyword" > void< / strong > *arg)
{
< strong class = "hl-keyword" > struct< / strong > aic_crypto_dev *ce_dev = arg;
ce_dev-> irq_status = readl(ce_dev-> base + CE_REG_ISR);
ce_dev-> err_status = readl(ce_dev-> base + CE_REG_ERR);
writel(ce_dev-> irq_status, ce_dev-> base + CE_REG_ISR);
< strong class = "hl-keyword" > return< / strong > IRQ_WAKE_THREAD;
}< / pre > < / div >
< div class = "- topic/p p" data-ofbid = "d72614e165__20250121171523" > 然后唤醒对应的处理线程，根据中断状态值，调用对应算法加速器的 IRQ
处理函数。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "ce_key_procedures__codeblock_y32_dby_21c" data-ofbid = "ce_key_procedures__codeblock_y32_dby_21c" > < strong class = "hl-keyword" > static< / strong > irqreturn_t aic_crypto_irq_thread(< strong class = "hl-keyword" > int< / strong > irq, < strong class = "hl-keyword" > void< / strong > *arg)
{
< strong class = "hl-keyword" > struct< / strong > aic_crypto_dev *ce_dev = arg;
< strong class = "hl-keyword" > if< / strong > (ce_dev-> irq_status & (< span class = "hl-number" > 0x1< / span > < < DMA_CHAN_SK_ACCELERATOR))
aic_skcipher_handle_irq(ce_dev);
< strong class = "hl-keyword" > if< / strong > (ce_dev-> irq_status & (< span class = "hl-number" > 0x1< / span > < < DMA_CHAN_AK_ACCELERATOR))
aic_akcipher_handle_irq(ce_dev);
< strong class = "hl-keyword" > if< / strong > (ce_dev-> irq_status & (< span class = "hl-number" > 0x1< / span > < < DMA_CHAN_HASH_ACCELERATOR))
aic_hash_handle_irq(ce_dev);
< strong class = "hl-keyword" > return< / strong > IRQ_HANDLED;
}< / pre > < / div >
< div class = "- topic/p p" data-ofbid = "d72614e170__20250121171523" > 如前面所述，各算法加速器的 IRQ
处理函数只做相关资源的释放，以及请求处理完成的通知。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "ce_key_procedures__codeblock_d5h_dby_21c" data-ofbid = "ce_key_procedures__codeblock_d5h_dby_21c" > aic_skcipher_handle_irq(ce_dev);
|-> crypto_finalize_skcipher_request(ce-> sk_accel.engine, req, err);
|-> aic_skcipher_unprepare_req(engine, req);
|-> req.complete(req, err);< / pre > < / div >
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< div class = " wh_topic_toc " > < div class = "wh_topic_label" > 在本页上< / div > < ul > < li class = "section-item" > < div class = "section-title" > < a href = "#ce_key_procedures__section_hhx_y1y_21c" data-tocid = "ce_key_procedures__section_hhx_y1y_21c" > 初始化流程< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#ce_key_procedures__section_khx_y1y_21c" data-tocid = "ce_key_procedures__section_khx_y1y_21c" > 数据处理流程< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#ce_key_procedures__section_thx_y1y_21c" data-tocid = "ce_key_procedures__section_thx_y1y_21c" > 中断处理流程< / a > < / div > < / li > < / ul > < / div >
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}
.p2 {
font-family: Arial, Helvetica, sans-serif;
}
.p3 {
font-family: "Lucida Console", "Courier New", monospace;
}
-->< / style >
< div class = "webhelp.fragment.footer" >
< p class = "p1" > Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.< / p >
< / div > < div >
< div class = "generation_time" >
Update Time: 2025-01-21
< / div >
< / div >
< / div >
< / footer >
< div id = "go2top" class = "d-print-none" >
< span class = "oxy-icon oxy-icon-up" > < / span >
< / div >
< div id = "modal_img_large" class = "modal" >
< span class = "close oxy-icon oxy-icon-remove" > < / span >
< div id = "modal_img_container" > < / div >
< div id = "caption" > < / div >
< / div >
< script src = "${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer = "defer" > < / script >
< / body >
2025-01-23 16:37:00 +08:00
< / html >
