From patchwork Fri Apr 18 09:34:04 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qunqin Zhao X-Patchwork-Id: 882667 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 20C892741C9; Fri, 18 Apr 2025 09:32:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744968773; cv=none; b=VsUn2PXhZ4r0Xs5vsUfQMYuULbnr+17pK4XOtojDj7oJUIJnsUHXtoumlWmCFctmQkLJwL+I5DvKs0/V6cq9sC+fJ/uth2lbpI0a41n9BcyFeYBkwxpnFngmnHV/bAFbzVYmqHGBbS6xVLzDIhYoZfsiyO5wwCLK3IMQsd+Uers= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744968773; c=relaxed/simple; bh=noH75sxi+2I9Xnc6LUTaRGiOzVsG1ODIu9XdqaU4uFg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SnAEJgSaeep6tKUkrCK/ToIrdriG32s7ldgR5MVC9OzSiHsWDYx4J7jPy5Oj5W4X69II0eKWSRuRx4XSBcFRD7FI38yajPaxga5/NxGta4MjEq1EXTQ0+zKsbD3/+lj8Ob00l1weY96uLVyOWeylduyY2evuS2LXHEU5rBPFhHA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.40.54.180]) by gateway (Coremail) with SMTP id _____8AxCGo0HAJoM6LBAA--.58718S3; Fri, 18 Apr 2025 17:32:36 +0800 (CST) Received: from localhost.localdomain (unknown [10.40.54.180]) by front1 (Coremail) with SMTP id qMiowMCx_cYsHAJoGUKJAA--.15831S4; Fri, 18 Apr 2025 17:32:34 +0800 (CST) From: Qunqin Zhao To: herbert@gondor.apana.org.au, davem@davemloft.net, peterhuewe@gmx.de, jarkko@kernel.org Cc: linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-crypto@vger.kernel.org, jgg@ziepe.ca, linux-integrity@vger.kernel.org, pmenzel@molgen.mpg.de, Qunqin Zhao , Yinggang Gu , Huacai Chen Subject: [PATCH v8 2/5] crypto: loongson - add Loongson RNG driver support Date: Fri, 18 Apr 2025 17:34:04 +0800 Message-ID: <20250418093407.1335-3-zhaoqunqin@loongson.cn> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250418093407.1335-1-zhaoqunqin@loongson.cn> References: <20250418093407.1335-1-zhaoqunqin@loongson.cn> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: qMiowMCx_cYsHAJoGUKJAA--.15831S4 X-CM-SenderInfo: 52kd01pxqtx0o6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj93XoW3Jr15Cw18Kr48Xr48WFW5CFX_yoWxur4xpF 4Sya4Uur45GFsrC395trW5CrW5Z3s8Z3srWa9rX3W5Kr97Aw1kXryxJFyUArW7ArZxWry7 XFZ5GF40ka1UG3gCm3ZEXasCq-sJn29KB7ZKAUJUUUU3529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUB0b4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r126r13M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_ GcCE3s1ln4kS14v26r126r1DM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2 x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5 McIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr4 1lc7CjxVAaw2AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_ Gr1l4IxYO2xFxVAFwI0_JF0_Jw1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67 AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8I cVAFwI0_Gr0_Xr1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI 8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v2 6r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU4eMKDUUUU Loongson's Random Number Generator is found inside Loongson Security Engine chip. Co-developed-by: Yinggang Gu Signed-off-by: Yinggang Gu Signed-off-by: Qunqin Zhao Reviewed-by: Huacai Chen --- v8: Added reseed callbak. "lsrng" --> "loongson_rng". v7: Change the lsrng_ prefix to loongson_rng_ v6: Replace all "ls6000se" with "loongson" v2-v5: None drivers/crypto/loongson/Kconfig | 6 + drivers/crypto/loongson/Makefile | 1 + drivers/crypto/loongson/loongson-rng.c | 198 +++++++++++++++++++++++++ 3 files changed, 205 insertions(+) create mode 100644 drivers/crypto/loongson/loongson-rng.c diff --git a/drivers/crypto/loongson/Kconfig b/drivers/crypto/loongson/Kconfig index 9fdcc73bc..2a5ac65ea 100644 --- a/drivers/crypto/loongson/Kconfig +++ b/drivers/crypto/loongson/Kconfig @@ -9,3 +9,9 @@ config CRYPTO_DEV_LOONGSON_SE provided by the controller. The kernel cannot directly send commands to the engine and must first send them to the controller, which will forward them to the corresponding engine. + +config CRYPTO_DEV_LOONGSON_RNG + tristate "Support for Loongson RNG Driver" + depends on CRYPTO_DEV_LOONGSON_SE + help + Support for Loongson RNG Driver. diff --git a/drivers/crypto/loongson/Makefile b/drivers/crypto/loongson/Makefile index 5ebcd9ff8..1a614b28c 100644 --- a/drivers/crypto/loongson/Makefile +++ b/drivers/crypto/loongson/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_CRYPTO_DEV_LOONGSON_SE) += loongson-se.o +obj-$(CONFIG_CRYPTO_DEV_LOONGSON_RNG) += loongson-rng.o diff --git a/drivers/crypto/loongson/loongson-rng.c b/drivers/crypto/loongson/loongson-rng.c new file mode 100644 index 000000000..2fb989811 --- /dev/null +++ b/drivers/crypto/loongson/loongson-rng.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 HiSilicon Limited. */ +/* Copyright (c) 2025 Loongson Technology Corporation Limited. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "loongson-se.h" + +#define SE_SEED_SIZE 32 + +struct loongson_rng_list { + struct mutex lock; + struct list_head list; + int is_init; +}; + +struct loongson_rng { + bool is_used; + struct loongson_se_engine *engine; + struct list_head list; +}; + +struct loongson_rng_ctx { + struct loongson_rng *rng; +}; + +struct loongson_rng_cmd { + u32 cmd_id; + union { + u32 len; + u32 ret; + } u; + u32 seed_off; + u32 out_off; + u32 pad[4]; +}; + +static atomic_t rng_active_devs; +static struct loongson_rng_list rng_devices; + +static int loongson_rng_generate(struct crypto_rng *tfm, const u8 *src, + unsigned int slen, u8 *dstn, unsigned int dlen) +{ + struct loongson_rng_ctx *ctx = crypto_rng_ctx(tfm); + struct loongson_rng *rng = ctx->rng; + struct loongson_rng_cmd *cmd = rng->engine->command; + int err, len; + + cmd->seed_off = 0; + do { + len = min(dlen, rng->engine->buffer_size); + cmd = rng->engine->command; + cmd->u.len = len; + err = loongson_se_send_engine_cmd(rng->engine); + if (err) + return err; + + cmd = rng->engine->command_ret; + if (cmd->u.ret) + return -EFAULT; + + memcpy(dstn, rng->engine->data_buffer, len); + dlen -= len; + dstn += len; + } while (dlen > 0); + + return 0; +} + +static int loongson_rng_init(struct crypto_tfm *tfm) +{ + struct loongson_rng_ctx *ctx = crypto_tfm_ctx(tfm); + struct loongson_rng *rng; + int ret = -EBUSY; + + mutex_lock(&rng_devices.lock); + list_for_each_entry(rng, &rng_devices.list, list) { + if (!rng->is_used) { + rng->is_used = true; + ctx->rng = rng; + ret = 0; + break; + } + } + mutex_unlock(&rng_devices.lock); + + return ret; +} + +static void loongson_rng_exit(struct crypto_tfm *tfm) +{ + struct loongson_rng_ctx *ctx = crypto_tfm_ctx(tfm); + + mutex_lock(&rng_devices.lock); + ctx->rng->is_used = false; + mutex_unlock(&rng_devices.lock); +} + +static int loongson_rng_seed(struct crypto_rng *tfm, const u8 *seed, + unsigned int slen) +{ + struct loongson_rng_ctx *ctx = crypto_rng_ctx(tfm); + struct loongson_rng *rng = ctx->rng; + struct loongson_rng_cmd *cmd; + int err; + + cmd = rng->engine->command; + cmd->u.len = slen; + cmd->seed_off = rng->engine->buffer_off; + memcpy(rng->engine->data_buffer, seed, slen); + err = loongson_se_send_engine_cmd(rng->engine); + cmd = rng->engine->command_ret; + if (err || cmd->u.ret) + return -EFAULT; + + return 0; +} + +static struct rng_alg loongson_rng_alg = { + .generate = loongson_rng_generate, + .seed = loongson_rng_seed, + .seedsize = SE_SEED_SIZE, + .base = { + .cra_name = "stdrng", + .cra_driver_name = "loongson_stdrng", + .cra_priority = 300, + .cra_ctxsize = sizeof(struct loongson_rng_ctx), + .cra_module = THIS_MODULE, + .cra_init = loongson_rng_init, + .cra_exit = loongson_rng_exit, + }, +}; + +static void loongson_rng_add_to_list(struct loongson_rng *rng) +{ + mutex_lock(&rng_devices.lock); + list_add_tail(&rng->list, &rng_devices.list); + mutex_unlock(&rng_devices.lock); +} + +static int loongson_rng_probe(struct platform_device *pdev) +{ + struct loongson_rng_cmd *cmd; + struct loongson_rng *rng; + int ret; + + rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL); + if (!rng) + return -ENOMEM; + + rng->engine = loongson_se_init_engine(pdev->dev.parent, SE_ENGINE_RNG); + if (!rng->engine) + return -ENODEV; + cmd = rng->engine->command; + cmd->cmd_id = SE_CMD_RNG; + cmd->out_off = rng->engine->buffer_off; + + if (!rng_devices.is_init) { + ret = crypto_register_rng(&loongson_rng_alg); + if (ret) { + dev_err(&pdev->dev, "failed to register crypto(%d)\n", ret); + return ret; + } + INIT_LIST_HEAD(&rng_devices.list); + mutex_init(&rng_devices.lock); + rng_devices.is_init = true; + } + + loongson_rng_add_to_list(rng); + atomic_inc(&rng_active_devs); + + return 0; +} + +static struct platform_driver loongson_rng_driver = { + .probe = loongson_rng_probe, + .driver = { + .name = "loongson-rng", + }, +}; +module_platform_driver(loongson_rng_driver); + +MODULE_ALIAS("platform:loongson-rng"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Yinggang Gu "); +MODULE_AUTHOR("Qunqin Zhao "); +MODULE_DESCRIPTION("Loongson random number generator driver");