From mboxrd@z Thu Jan 1 00:00:00 1970 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 B0061C433EF for ; Sun, 20 Mar 2022 21:28:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237677AbiCTV36 (ORCPT ); Sun, 20 Mar 2022 17:29:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236574AbiCTV35 (ORCPT ); Sun, 20 Mar 2022 17:29:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5AA923120A for ; Sun, 20 Mar 2022 14:28:33 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DBEDF61227 for ; Sun, 20 Mar 2022 21:28:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8343FC340E9; Sun, 20 Mar 2022 21:28:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1647811712; bh=QyFxs6MlebcQqPH+Wv5rQhpVIN4ZlVwn1reUUn+S21s=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=m3gVXep5fL8lr2BIWhw2g8yExKrl7wMYeokMWtBHonWQSFIyuEl4fWgnHtldIw8Fc CTLiOr9E64bKuyPilHvkNACXATOXY2uAuuigCzx/mzaSsLKSvwZti1e1cxxPCsF2DS dCofTXrMIKrpEtv5iEtIZLU0noS9qJrzymJfVOrSEiN/BsjVTELLKPkQkKRISEYktq NkcxT84YWUPTMtfQKxgRpLEowp4RT2YkaUeA8Q9wW6bp6JPmZGzM8IzDjttBAjxsjn EDpynhF7NYrkUZKmicb6B1MwiIYLqZG2uq5yEkwfcsqHQA4+Nv9Un3EqHwlTnEhYqz 499dXC0Ewp+7g== Date: Sun, 20 Mar 2022 23:29:32 +0200 From: Jarkko Sakkinen To: 20220315161446.534-1-johannes.holland@infineon.com Cc: peterhuewe@gmx.de, linux-integrity@vger.kernel.org, Alexander.Steffen@infineon.com, Johannes Holland Subject: Re: [PATCH v3] tpm: Remove read16/read32/write32 calls from tpm_tis_phy_ops Message-ID: References: <20220318151647.410-1-johannes.holland@infineon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220318151647.410-1-johannes.holland@infineon.com> Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org On Fri, Mar 18, 2022 at 04:16:47PM +0100, Johannes Holland wrote: > Only tpm_tis and tpm_tis_synquacer have a dedicated way to access > multiple bytes at once, every other driver will just fall back to > read_bytes/write_bytes. Therefore, remove the read16/read32/write32 > calls and move their logic to read_bytes/write_bytes. > > * v2: > * rebase and apply changes to tpm_tis_synquacer, as well > * move variable declarations to beginning of functions > * v3: > * remove read16/read32/write32 api calls altogether and always call > read_bytes/write_bytes > > Signed-off-by: Johannes Holland > --- Please put the change log exactly here, so that it won't be included to the commit log. If you don't mind, there should be also Suggested-by: Jarkko Sakkinen > drivers/char/tpm/tpm_tis.c | 67 ++++++++--------- > drivers/char/tpm/tpm_tis_core.h | 53 ++++++++++--- > drivers/char/tpm/tpm_tis_spi.h | 4 - > drivers/char/tpm/tpm_tis_spi_cr50.c | 7 +- > drivers/char/tpm/tpm_tis_spi_main.c | 45 +---------- > drivers/char/tpm/tpm_tis_synquacer.c | 108 ++++++++++++--------------- > 6 files changed, 123 insertions(+), 161 deletions(-) > > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c > index d3f2e5364c27..bcff6429e0b4 100644 > --- a/drivers/char/tpm/tpm_tis.c > +++ b/drivers/char/tpm/tpm_tis.c > @@ -153,50 +153,46 @@ static int check_acpi_tpm2(struct device *dev) > #endif > > static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, > - u8 *result) > + u8 *result, enum tpm_tis_io_mode io_mode) > { > struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > - > - while (len--) > - *result++ = ioread8(phy->iobase + addr); > + __le16 result_le16; > + __le32 result_le32; > + > + switch (io_mode) { > + case TPM_TIS_PHYS_8: > + while (len--) > + *result++ = ioread8(phy->iobase + addr); > + break; > + case TPM_TIS_PHYS_16: > + result_le16 = cpu_to_le16(ioread16(phy->iobase + addr)); > + memcpy(result, &result_le16, sizeof(u16)); > + break; > + case TPM_TIS_PHYS_32: > + result_le32 = cpu_to_le32(ioread32(phy->iobase + addr)); > + memcpy(result, &result_le32, sizeof(u32)); > + break; > + } > > return 0; > } > > static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, > - const u8 *value) > + const u8 *value, enum tpm_tis_io_mode io_mode) > { > struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > > - while (len--) > - iowrite8(*value++, phy->iobase + addr); > - > - return 0; > -} > - > -static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result) > -{ > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > - > - *result = ioread16(phy->iobase + addr); > - > - return 0; > -} > - > -static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result) > -{ > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > - > - *result = ioread32(phy->iobase + addr); > - > - return 0; > -} > - > -static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value) > -{ > - struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); > - > - iowrite32(value, phy->iobase + addr); > + switch (io_mode) { > + case TPM_TIS_PHYS_8: > + while (len--) > + iowrite8(*value++, phy->iobase + addr); > + break; > + case TPM_TIS_PHYS_16: > + return -EINVAL; > + case TPM_TIS_PHYS_32: > + iowrite32(le32_to_cpu(*((__le32 *)value)), phy->iobase + addr); > + break; > + } > > return 0; > } > @@ -204,9 +200,6 @@ static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value) > static const struct tpm_tis_phy_ops tpm_tcg = { > .read_bytes = tpm_tcg_read_bytes, > .write_bytes = tpm_tcg_write_bytes, > - .read16 = tpm_tcg_read16, > - .read32 = tpm_tcg_read32, > - .write32 = tpm_tcg_write32, > }; > > static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info) > diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h > index 3be24f221e32..e2b8e6de25b4 100644 > --- a/drivers/char/tpm/tpm_tis_core.h > +++ b/drivers/char/tpm/tpm_tis_core.h > @@ -104,54 +104,83 @@ struct tpm_tis_data { > unsigned int timeout_max; /* usecs */ > }; > Please add a comment here to explain this enum: /* * */ > +enum tpm_tis_io_mode { > + TPM_TIS_PHYS_8, > + TPM_TIS_PHYS_16, > + TPM_TIS_PHYS_32, > +}; > + > struct tpm_tis_phy_ops { > + /* data is passed in little endian */ > int (*read_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, > - u8 *result); > + u8 *result, enum tpm_tis_io_mode mode); > int (*write_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, > - const u8 *value); > - int (*read16)(struct tpm_tis_data *data, u32 addr, u16 *result); > - int (*read32)(struct tpm_tis_data *data, u32 addr, u32 *result); > - int (*write32)(struct tpm_tis_data *data, u32 addr, u32 src); > + const u8 *value, enum tpm_tis_io_mode mode); > }; > > static inline int tpm_tis_read_bytes(struct tpm_tis_data *data, u32 addr, > u16 len, u8 *result) > { > - return data->phy_ops->read_bytes(data, addr, len, result); > + return data->phy_ops->read_bytes(data, addr, len, result, > + TPM_TIS_PHYS_8); > } > > static inline int tpm_tis_read8(struct tpm_tis_data *data, u32 addr, u8 *result) > { > - return data->phy_ops->read_bytes(data, addr, 1, result); > + return data->phy_ops->read_bytes(data, addr, 1, result, TPM_TIS_PHYS_8); > } > > static inline int tpm_tis_read16(struct tpm_tis_data *data, u32 addr, > u16 *result) > { > - return data->phy_ops->read16(data, addr, result); > + __le16 result_le; > + int rc; > + > + rc = data->phy_ops->read_bytes(data, addr, sizeof(u16), > + (u8 *)&result_le, TPM_TIS_PHYS_16); > + if (!rc) > + *result = le16_to_cpu(result_le); > + > + return rc; > } > > static inline int tpm_tis_read32(struct tpm_tis_data *data, u32 addr, > u32 *result) > { > - return data->phy_ops->read32(data, addr, result); > + __le32 result_le; > + int rc; > + > + rc = data->phy_ops->read_bytes(data, addr, sizeof(u32), > + (u8 *)&result_le, TPM_TIS_PHYS_32); > + if (!rc) > + *result = le32_to_cpu(result_le); > + > + return rc; > } > > static inline int tpm_tis_write_bytes(struct tpm_tis_data *data, u32 addr, > u16 len, const u8 *value) > { > - return data->phy_ops->write_bytes(data, addr, len, value); > + return data->phy_ops->write_bytes(data, addr, len, value, > + TPM_TIS_PHYS_8); > } > > static inline int tpm_tis_write8(struct tpm_tis_data *data, u32 addr, u8 value) > { > - return data->phy_ops->write_bytes(data, addr, 1, &value); > + return data->phy_ops->write_bytes(data, addr, 1, &value, > + TPM_TIS_PHYS_8); > } > > static inline int tpm_tis_write32(struct tpm_tis_data *data, u32 addr, > u32 value) > { > - return data->phy_ops->write32(data, addr, value); > + __le32 value_le; > + int rc; > + > + value_le = cpu_to_le32(value); > + rc = data->phy_ops->write_bytes(data, addr, sizeof(u32), > + (u8 *)&value_le, TPM_TIS_PHYS_32); > + return rc; > } > > static inline bool is_bsw(void) > diff --git a/drivers/char/tpm/tpm_tis_spi.h b/drivers/char/tpm/tpm_tis_spi.h > index bba73979c368..d0f66f6f1931 100644 > --- a/drivers/char/tpm/tpm_tis_spi.h > +++ b/drivers/char/tpm/tpm_tis_spi.h > @@ -31,10 +31,6 @@ extern int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy, > extern int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len, > u8 *in, const u8 *out); > > -extern int tpm_tis_spi_read16(struct tpm_tis_data *data, u32 addr, u16 *result); > -extern int tpm_tis_spi_read32(struct tpm_tis_data *data, u32 addr, u32 *result); > -extern int tpm_tis_spi_write32(struct tpm_tis_data *data, u32 addr, u32 value); > - > #ifdef CONFIG_TCG_TIS_SPI_CR50 > extern int cr50_spi_probe(struct spi_device *spi); > #else > diff --git a/drivers/char/tpm/tpm_tis_spi_cr50.c b/drivers/char/tpm/tpm_tis_spi_cr50.c > index 7bf123d3c537..f4937280e940 100644 > --- a/drivers/char/tpm/tpm_tis_spi_cr50.c > +++ b/drivers/char/tpm/tpm_tis_spi_cr50.c > @@ -222,13 +222,13 @@ static int tpm_tis_spi_cr50_transfer(struct tpm_tis_data *data, u32 addr, u16 le > } > > static int tpm_tis_spi_cr50_read_bytes(struct tpm_tis_data *data, u32 addr, > - u16 len, u8 *result) > + u16 len, u8 *result, enum tpm_tis_io_mode io_mode) > { > return tpm_tis_spi_cr50_transfer(data, addr, len, result, NULL); > } > > static int tpm_tis_spi_cr50_write_bytes(struct tpm_tis_data *data, u32 addr, > - u16 len, const u8 *value) > + u16 len, const u8 *value, enum tpm_tis_io_mode io_mode) > { > return tpm_tis_spi_cr50_transfer(data, addr, len, NULL, value); > } > @@ -236,9 +236,6 @@ static int tpm_tis_spi_cr50_write_bytes(struct tpm_tis_data *data, u32 addr, > static const struct tpm_tis_phy_ops tpm_spi_cr50_phy_ops = { > .read_bytes = tpm_tis_spi_cr50_read_bytes, > .write_bytes = tpm_tis_spi_cr50_write_bytes, > - .read16 = tpm_tis_spi_read16, > - .read32 = tpm_tis_spi_read32, > - .write32 = tpm_tis_spi_write32, > }; > > static void cr50_print_fw_version(struct tpm_tis_data *data) > diff --git a/drivers/char/tpm/tpm_tis_spi_main.c b/drivers/char/tpm/tpm_tis_spi_main.c > index aaa59a00eeae..d0920c3c400f 100644 > --- a/drivers/char/tpm/tpm_tis_spi_main.c > +++ b/drivers/char/tpm/tpm_tis_spi_main.c > @@ -141,55 +141,17 @@ int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len, > } > > static int tpm_tis_spi_read_bytes(struct tpm_tis_data *data, u32 addr, > - u16 len, u8 *result) > + u16 len, u8 *result, enum tpm_tis_io_mode io_mode) > { > return tpm_tis_spi_transfer(data, addr, len, result, NULL); > } > > static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr, > - u16 len, const u8 *value) > + u16 len, const u8 *value, enum tpm_tis_io_mode io_mode) > { > return tpm_tis_spi_transfer(data, addr, len, NULL, value); > } > > -int tpm_tis_spi_read16(struct tpm_tis_data *data, u32 addr, u16 *result) > -{ > - __le16 result_le; > - int rc; > - > - rc = data->phy_ops->read_bytes(data, addr, sizeof(u16), > - (u8 *)&result_le); > - if (!rc) > - *result = le16_to_cpu(result_le); > - > - return rc; > -} > - > -int tpm_tis_spi_read32(struct tpm_tis_data *data, u32 addr, u32 *result) > -{ > - __le32 result_le; > - int rc; > - > - rc = data->phy_ops->read_bytes(data, addr, sizeof(u32), > - (u8 *)&result_le); > - if (!rc) > - *result = le32_to_cpu(result_le); > - > - return rc; > -} > - > -int tpm_tis_spi_write32(struct tpm_tis_data *data, u32 addr, u32 value) > -{ > - __le32 value_le; > - int rc; > - > - value_le = cpu_to_le32(value); > - rc = data->phy_ops->write_bytes(data, addr, sizeof(u32), > - (u8 *)&value_le); > - > - return rc; > -} > - > int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy, > int irq, const struct tpm_tis_phy_ops *phy_ops) > { > @@ -205,9 +167,6 @@ int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy, > static const struct tpm_tis_phy_ops tpm_spi_phy_ops = { > .read_bytes = tpm_tis_spi_read_bytes, > .write_bytes = tpm_tis_spi_write_bytes, > - .read16 = tpm_tis_spi_read16, > - .read32 = tpm_tis_spi_read32, > - .write32 = tpm_tis_spi_write32, > }; > > static int tpm_tis_spi_probe(struct spi_device *dev) > diff --git a/drivers/char/tpm/tpm_tis_synquacer.c b/drivers/char/tpm/tpm_tis_synquacer.c > index e47bdd272704..2751be8e6065 100644 > --- a/drivers/char/tpm/tpm_tis_synquacer.c > +++ b/drivers/char/tpm/tpm_tis_synquacer.c > @@ -35,72 +35,63 @@ static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_da > } > > static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr, > - u16 len, u8 *result) > + u16 len, u8 *result, > + enum tpm_tis_io_mode io_mode) > { > struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); > - > - while (len--) > - *result++ = ioread8(phy->iobase + addr); > + __le16 result_le16; > + __le32 result_le32; > + u16 result16; > + u32 result32; > + > + switch (io_mode) { > + case TPM_TIS_PHYS_8: > + while (len--) > + *result++ = ioread8(phy->iobase + addr); > + break; > + case TPM_TIS_PHYS_16: > + result[1] = ioread8(phy->iobase + addr + 1); > + result[0] = ioread8(phy->iobase + addr); > + break; > + case TPM_TIS_PHYS_32: > + result[3] = ioread8(phy->iobase + addr + 3); > + result[2] = ioread8(phy->iobase + addr + 2); > + result[1] = ioread8(phy->iobase + addr + 1); > + result[0] = ioread8(phy->iobase + addr); > + break; > + } > > return 0; > } > > static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr, > - u16 len, const u8 *value) > + u16 len, const u8 *value, > + enum tpm_tis_io_mode io_mode) > { > struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); > - > - while (len--) > - iowrite8(*value++, phy->iobase + addr); > - > - return 0; > -} > - > -static int tpm_tis_synquacer_read16_bw(struct tpm_tis_data *data, > - u32 addr, u16 *result) > -{ > - struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); > - > - /* > - * Due to the limitation of SPI controller on SynQuacer, > - * 16/32 bits access must be done in byte-wise and descending order. > - */ > - *result = (ioread8(phy->iobase + addr + 1) << 8) | > - (ioread8(phy->iobase + addr)); > - > - return 0; > -} > - > -static int tpm_tis_synquacer_read32_bw(struct tpm_tis_data *data, > - u32 addr, u32 *result) > -{ > - struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); > - > - /* > - * Due to the limitation of SPI controller on SynQuacer, > - * 16/32 bits access must be done in byte-wise and descending order. > - */ > - *result = (ioread8(phy->iobase + addr + 3) << 24) | > - (ioread8(phy->iobase + addr + 2) << 16) | > - (ioread8(phy->iobase + addr + 1) << 8) | > - (ioread8(phy->iobase + addr)); > - > - return 0; > -} > - > -static int tpm_tis_synquacer_write32_bw(struct tpm_tis_data *data, > - u32 addr, u32 value) > -{ > - struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); > - > - /* > - * Due to the limitation of SPI controller on SynQuacer, > - * 16/32 bits access must be done in byte-wise and descending order. > - */ > - iowrite8(value >> 24, phy->iobase + addr + 3); > - iowrite8(value >> 16, phy->iobase + addr + 2); > - iowrite8(value >> 8, phy->iobase + addr + 1); > - iowrite8(value, phy->iobase + addr); > + __le16 result_le16; > + __le32 result_le32; > + u16 result16; > + u32 result32; > + > + switch (io_mode) { > + case TPM_TIS_PHYS_8: > + while (len--) > + iowrite8(*value++, phy->iobase + addr); > + break; > + case TPM_TIS_PHYS_16: > + return -EINVAL; > + case TPM_TIS_PHYS_32: > + /* > + * Due to the limitation of SPI controller on SynQuacer, > + * 16/32 bits access must be done in byte-wise and descending order. > + */ > + iowrite8(&value[3], phy->iobase + addr + 3); > + iowrite8(&value[2], phy->iobase + addr + 2); > + iowrite8(&value[1], phy->iobase + addr + 1); > + iowrite8(&value[0], phy->iobase + addr); > + break; > + } > > return 0; > } > @@ -108,9 +99,6 @@ static int tpm_tis_synquacer_write32_bw(struct tpm_tis_data *data, > static const struct tpm_tis_phy_ops tpm_tcg_bw = { > .read_bytes = tpm_tis_synquacer_read_bytes, > .write_bytes = tpm_tis_synquacer_write_bytes, > - .read16 = tpm_tis_synquacer_read16_bw, > - .read32 = tpm_tis_synquacer_read32_bw, > - .write32 = tpm_tis_synquacer_write32_bw, > }; > > static int tpm_tis_synquacer_init(struct device *dev, > -- > 2.31.1.windows.1 > Other than that I did not find anything else to complain about :-) BR, Jarkko