From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 92668190664; Tue, 24 Jun 2025 23:35:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750808136; cv=none; b=XkjcS6m3dPwojO1yciy3viIMpelRlpjMB8yoDI4LE8LPUN6FDhOdkl0wyb1aBxniR3YjLrPE3aTuIzCOFpEHrzQ+iEddi/Mpuysnw5ZQExmrbxXg/QlMdmikr151hEBM7uuqOPzE1kXvcWKLYdqHfr30PwhSwBmeiDOn1gZfvqU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750808136; c=relaxed/simple; bh=DBSni6pXshmHKrIebjfJdljvqz+aDXOLlSVsdM1Y+BY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=TZOmjSJAdKjmtfHUhxvhZfYPQRri/a/FLL6UWWqyP25OK2yf1i2XhLgYGmSQWxwcbZF/wiE0mlLtVsoeo2z4hXbB8BskRg+q2qP+QjQHeniibgO/F+U4epnLD761sdDXJXdMcEe3GQP62QG3sDNn3wB2MwT2yfWsjTIxGsH3Yhk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HRhtQ6V3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HRhtQ6V3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9513AC4CEE3; Tue, 24 Jun 2025 23:35:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750808136; bh=DBSni6pXshmHKrIebjfJdljvqz+aDXOLlSVsdM1Y+BY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=HRhtQ6V3o9Diw0R9OYYSQfaIr7Taf1gXaiOIDxUgTlWcRZVayB6sw5B2QQURXvsZG g2NFejNtNuPvqOuAq9hzibyeXJo0kJ7MFVCUJ9IrrGlz52ocLq6K+uZ+Ko8F8bCfBd ymMhAeAwhoh/cPe99Yqi3N2kX2M46eJUBkeXKpu1BI8jiV+5YLXQAAHhkrLF2tCApr fusjJFLWmRdtVjK0KAmvJmyVv82ouFhhM8gAxZbZi1tvZjAA346liH9DXuooypOn1l N5wnZcyGxM/NTx1nv6rBFAMb7XKUxdA/sGWNoLiRicr6GAeN5RACFUJ0MVLGtXFlGF C2O6X6RIgYAQA== Date: Wed, 25 Jun 2025 02:35:32 +0300 From: Jarkko Sakkinen To: Qunqin Zhao Cc: lee@kernel.org, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, davem@davemloft.net, linux-crypto@vger.kernel.org, peterhuewe@gmx.de, jgg@ziepe.ca, linux-integrity@vger.kernel.org, Yinggang Gu , Huacai Chen Subject: Re: [PATCH v11 3/4] tpm: Add a driver for Loongson TPM device Message-ID: References: <20250619025138.2854-1-zhaoqunqin@loongson.cn> <20250619025138.2854-4-zhaoqunqin@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250619025138.2854-4-zhaoqunqin@loongson.cn> On Thu, Jun 19, 2025 at 10:51:37AM +0800, Qunqin Zhao wrote: > Loongson Security Engine supports random number generation, hash, > symmetric encryption and asymmetric encryption. Based on these > encryption functions, TPM2 have been implemented in the Loongson > Security Engine firmware. This driver is responsible for copying data > into the memory visible to the firmware and receiving data from the > firmware. > > Co-developed-by: Yinggang Gu > Signed-off-by: Yinggang Gu > Signed-off-by: Qunqin Zhao > Reviewed-by: Huacai Chen > --- > drivers/char/tpm/Kconfig | 9 ++++ > drivers/char/tpm/Makefile | 1 + > drivers/char/tpm/tpm_loongson.c | 84 +++++++++++++++++++++++++++++++++ > 3 files changed, 94 insertions(+) > create mode 100644 drivers/char/tpm/tpm_loongson.c > > diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig > index dddd702b2..ba3924eb1 100644 > --- a/drivers/char/tpm/Kconfig > +++ b/drivers/char/tpm/Kconfig > @@ -189,6 +189,15 @@ config TCG_IBMVTPM > will be accessible from within Linux. To compile this driver > as a module, choose M here; the module will be called tpm_ibmvtpm. > > +config TCG_LOONGSON > + tristate "Loongson TPM Interface" > + depends on MFD_LOONGSON_SE > + help > + If you want to make Loongson TPM support available, say Yes and > + it will be accessible from within Linux. To compile this > + driver as a module, choose M here; the module will be called > + tpm_loongson. > + > config TCG_XEN > tristate "XEN TPM Interface" > depends on TCG_TPM && XEN > diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile > index 9de1b3ea3..5b5cdc0d3 100644 > --- a/drivers/char/tpm/Makefile > +++ b/drivers/char/tpm/Makefile > @@ -46,3 +46,4 @@ obj-$(CONFIG_TCG_ARM_CRB_FFA) += tpm_crb_ffa.o > obj-$(CONFIG_TCG_VTPM_PROXY) += tpm_vtpm_proxy.o > obj-$(CONFIG_TCG_FTPM_TEE) += tpm_ftpm_tee.o > obj-$(CONFIG_TCG_SVSM) += tpm_svsm.o > +obj-$(CONFIG_TCG_LOONGSON) += tpm_loongson.o > diff --git a/drivers/char/tpm/tpm_loongson.c b/drivers/char/tpm/tpm_loongson.c > new file mode 100644 > index 000000000..5cbdb37f8 > --- /dev/null > +++ b/drivers/char/tpm/tpm_loongson.c > @@ -0,0 +1,84 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* Copyright (c) 2025 Loongson Technology Corporation Limited. */ > + > +#include > +#include > +#include > +#include > + > +#include "tpm.h" > + > +struct tpm_loongson_cmd { > + u32 cmd_id; > + u32 data_off; > + u32 data_len; > + u32 pad[5]; > +}; > + > +static int tpm_loongson_recv(struct tpm_chip *chip, u8 *buf, size_t count) > +{ > + struct loongson_se_engine *tpm_engine = dev_get_drvdata(&chip->dev); > + struct tpm_loongson_cmd *cmd_ret = tpm_engine->command_ret; > + > + if (cmd_ret->data_len > count) > + return -EIO; > + > + memcpy(buf, tpm_engine->data_buffer, cmd_ret->data_len); > + > + return cmd_ret->data_len; > +} > + > +static int tpm_loongson_send(struct tpm_chip *chip, u8 *buf, size_t count) > +{ > + struct loongson_se_engine *tpm_engine = dev_get_drvdata(&chip->dev); > + struct tpm_loongson_cmd *cmd = tpm_engine->command; > + > + if (count > tpm_engine->buffer_size) > + return -E2BIG; > + > + cmd->data_len = count; > + memcpy(tpm_engine->data_buffer, buf, count); > + > + return loongson_se_send_engine_cmd(tpm_engine); > +} > + > +static const struct tpm_class_ops tpm_loongson_ops = { > + .flags = TPM_OPS_AUTO_STARTUP, > + .recv = tpm_loongson_recv, > + .send = tpm_loongson_send, > +}; > + > +static int tpm_loongson_probe(struct platform_device *pdev) > +{ > + struct loongson_se_engine *tpm_engine; > + struct device *dev = &pdev->dev; > + struct tpm_loongson_cmd *cmd; > + struct tpm_chip *chip; > + > + tpm_engine = loongson_se_init_engine(dev->parent, SE_ENGINE_TPM); > + if (!tpm_engine) > + return -ENODEV; > + cmd = tpm_engine->command; > + cmd->cmd_id = SE_CMD_TPM; > + cmd->data_off = tpm_engine->buffer_off; > + > + chip = tpmm_chip_alloc(dev, &tpm_loongson_ops); > + if (IS_ERR(chip)) > + return PTR_ERR(chip); > + chip->flags = TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_IRQ; > + dev_set_drvdata(&chip->dev, tpm_engine); > + > + return tpm_chip_register(chip); > +} > + > +static struct platform_driver tpm_loongson = { > + .probe = tpm_loongson_probe, > + .driver = { > + .name = "loongson-tpm", This patch looks otherwise great but I'd prefer here tho use "tpm_loongson_probe" for the value of the name field. > + }, > +}; > +module_platform_driver(tpm_loongson); > + > +MODULE_ALIAS("platform:loongson-tpm"); > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("Loongson TPM driver"); > -- > 2.45.2 > BR, Jarkko