From patchwork Mon Sep 25 17:23:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Om Prakash Singh X-Patchwork-Id: 726102 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2439CE7AAA for ; Mon, 25 Sep 2023 17:23:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229595AbjIYRX4 (ORCPT ); Mon, 25 Sep 2023 13:23:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229437AbjIYRX4 (ORCPT ); Mon, 25 Sep 2023 13:23:56 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 89E97101; Mon, 25 Sep 2023 10:23:49 -0700 (PDT) Received: from pps.filterd (m0279868.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38PFHX9d024729; Mon, 25 Sep 2023 17:23:36 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=T3OwJhM/JeYff7ROz0beeSE0n+kPH8oKWpl5fSpxi08=; b=fPlX3INTdzefshW29dvh5eKmq3ojDVVVAwcsW/k98AvzVjciaPc/npfsr/BgwOSnFTJA tna4BjI1+ZrhN4bfMEtWIsnUeYumKTrf/MHYQ9FVlq5eBDnlX6wQeSaF5TQypeJsW0jv 7QQn34uU7DAY7vyPwVEDUZWWT7XJD9YXK3fE67fN3ItSTtYq61j7yuCZqNmOUGDfei8e BMmC0TmcvxRMMF7tCYl6CDCLfKunY512n306FbxEHdUCrWRzCh7a0ektR+/ncqD0/lk/ UrNzLVaIW3Qn4o6XdsBndDUwQDVja0nxUgbHR3eiydwGlYNBR/sZIQxBTr167SHNyNtq NQ== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3tb6tt181x-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 25 Sep 2023 17:23:35 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 38PHNY0k024258 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 25 Sep 2023 17:23:34 GMT Received: from hu-omprsing-hyd.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Mon, 25 Sep 2023 10:23:29 -0700 From: Om Prakash Singh To: CC: , , , , , , , , , , , , , , Subject: [PATCH V3] crypto: qcom-rng - Add hw_random interface support Date: Mon, 25 Sep 2023 22:53:12 +0530 Message-ID: <20230925172312.2843262-1-quic_omprsing@quicinc.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: XHIHu42yXeYgLyf3DQvJZGrf8le_2F77 X-Proofpoint-ORIG-GUID: XHIHu42yXeYgLyf3DQvJZGrf8le_2F77 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-09-25_15,2023-09-25_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 adultscore=0 lowpriorityscore=0 spamscore=0 mlxscore=0 phishscore=0 bulkscore=0 suspectscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2309250135 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Om Prakash Singh Add hw_random interface support in qcom-rng driver as new IP block in Qualcomm SoC has inbuilt NIST SP800 90B compliant entropic source to generate true random number. Keeping current rng_alg interface as well for random number generation using Kernel Crypto API. Signed-off-by: Om Prakash Singh --- Changes in V3: - Fix qcom_rng_read() implementation to account for remaining bytes read - Update qcom_rng_generate() return condition for success case - Added hwrng structure as part of qcom_rng structure Changes in V2: - Updated patch to fix the return value from qcom_rng_generate() to be consistent with current implementation - Updated patch to make it more concise - Removed unnecessary use local variable and it's initialization - Updated patch to use devm_hwrng_register() instead of hwrng_register() - Updated subject line of the patch This patch is depends on [1] [1] https://lore.kernel.org/lkml/20230824-topic-sm8550-rng-v2-4-dfcafbb16a3e@linaro.org/ drivers/crypto/qcom-rng.c | 66 ++++++++++++++++++++++++++++++++++----- 1 file changed, 58 insertions(+), 8 deletions(-) diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c index fb54b8cfc35f..94cc9b539491 100644 --- a/drivers/crypto/qcom-rng.c +++ b/drivers/crypto/qcom-rng.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include @@ -28,17 +29,25 @@ #define WORD_SZ 4 +#define QCOM_TRNG_QUALITY 1024 + struct qcom_rng { struct mutex lock; void __iomem *base; struct clk *clk; - unsigned int skip_init; + struct hwrng hwrng; + struct qcom_rng_of_data *of_data; }; struct qcom_rng_ctx { struct qcom_rng *rng; }; +struct qcom_rng_of_data { + bool skip_init; + bool hwrng_support; +}; + static struct qcom_rng *qcom_rng_dev; static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max) @@ -66,11 +75,11 @@ static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max) } else { /* copy only remaining bytes */ memcpy(data, &val, max - currsize); - break; + currsize = max; } } while (currsize < max); - return 0; + return currsize; } static int qcom_rng_generate(struct crypto_rng *tfm, @@ -92,6 +101,9 @@ static int qcom_rng_generate(struct crypto_rng *tfm, mutex_unlock(&rng->lock); clk_disable_unprepare(rng->clk); + if (ret >= 0) + ret = 0; + return ret; } @@ -101,6 +113,13 @@ static int qcom_rng_seed(struct crypto_rng *tfm, const u8 *seed, return 0; } +static int qcom_hwrng_read(struct hwrng *hwrng, void *data, size_t max, bool wait) +{ + struct qcom_rng *qrng = container_of(hwrng, struct qcom_rng, hwrng); + + return qcom_rng_read(qrng, data, max); +} + static int qcom_rng_enable(struct qcom_rng *rng) { u32 val; @@ -136,7 +155,7 @@ static int qcom_rng_init(struct crypto_tfm *tfm) ctx->rng = qcom_rng_dev; - if (!ctx->rng->skip_init) + if (!ctx->rng->of_data->skip_init) return qcom_rng_enable(ctx->rng); return 0; @@ -177,15 +196,31 @@ static int qcom_rng_probe(struct platform_device *pdev) if (IS_ERR(rng->clk)) return PTR_ERR(rng->clk); - rng->skip_init = (unsigned long)device_get_match_data(&pdev->dev); + rng->of_data = (struct qcom_rng_of_data *)of_device_get_match_data(&pdev->dev); qcom_rng_dev = rng; ret = crypto_register_rng(&qcom_rng_alg); if (ret) { dev_err(&pdev->dev, "Register crypto rng failed: %d\n", ret); qcom_rng_dev = NULL; + return ret; + } + + if (rng->of_data->hwrng_support) { + rng->hwrng.name = "qcom_hwrng"; + rng->hwrng.read = qcom_hwrng_read; + rng->hwrng.quality = QCOM_TRNG_QUALITY; + ret = devm_hwrng_register(&pdev->dev, &rng->hwrng); + if (ret) { + dev_err(&pdev->dev, "Register hwrng failed: %d\n", ret); + qcom_rng_dev = NULL; + goto fail; + } } + return ret; +fail: + crypto_unregister_rng(&qcom_rng_alg); return ret; } @@ -198,6 +233,21 @@ static int qcom_rng_remove(struct platform_device *pdev) return 0; } +struct qcom_rng_of_data qcom_prng_of_data = { + .skip_init = false, + .hwrng_support = false, +}; + +struct qcom_rng_of_data qcom_prng_ee_of_data = { + .skip_init = true, + .hwrng_support = false, +}; + +struct qcom_rng_of_data qcom_trng_of_data = { + .skip_init = true, + .hwrng_support = true, +}; + static const struct acpi_device_id __maybe_unused qcom_rng_acpi_match[] = { { .id = "QCOM8160", .driver_data = 1 }, {} @@ -205,9 +255,9 @@ static const struct acpi_device_id __maybe_unused qcom_rng_acpi_match[] = { MODULE_DEVICE_TABLE(acpi, qcom_rng_acpi_match); static const struct of_device_id __maybe_unused qcom_rng_of_match[] = { - { .compatible = "qcom,prng", .data = (void *)0}, - { .compatible = "qcom,prng-ee", .data = (void *)1}, - { .compatible = "qcom,trng", .data = (void *)1}, + { .compatible = "qcom,prng", .data = &qcom_prng_of_data }, + { .compatible = "qcom,prng-ee", .data = &qcom_prng_ee_of_data }, + { .compatible = "qcom,trng", .data = &qcom_trng_of_data }, {} }; MODULE_DEVICE_TABLE(of, qcom_rng_of_match);