From patchwork Wed Feb 14 13:43:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Winkler, Tomas" X-Patchwork-Id: 10218921 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D41A0601D7 for ; Wed, 14 Feb 2018 13:46:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C0B4A28FAE for ; Wed, 14 Feb 2018 13:46:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B5CB828FE1; Wed, 14 Feb 2018 13:46:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E8BFD28FAE for ; Wed, 14 Feb 2018 13:46:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030583AbeBNNq1 (ORCPT ); Wed, 14 Feb 2018 08:46:27 -0500 Received: from mga11.intel.com ([192.55.52.93]:43521 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030289AbeBNNqZ (ORCPT ); Wed, 14 Feb 2018 08:46:25 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Feb 2018 05:46:25 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,512,1511856000"; d="scan'208";a="18372654" Received: from twinkler-lnx.jer.intel.com ([10.12.91.43]) by orsmga006.jf.intel.com with ESMTP; 14 Feb 2018 05:46:22 -0800 From: Tomas Winkler To: Jarkko Sakkinen , Jason Gunthorpe Cc: Alexander Usyskin , linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Tomas Winkler Subject: [PATCH 1/2 v3] tpm: cmd_ready command can be issued only after granting locality Date: Wed, 14 Feb 2018 15:43:18 +0200 Message-Id: <20180214134319.4400-2-tomas.winkler@intel.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180214134319.4400-1-tomas.winkler@intel.com> References: <20180214134319.4400-1-tomas.winkler@intel.com> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP The correct sequence is to first request locality and only after that perform cmd_ready handshake, otherwise the hardware will drop the subsequent message as from the device point of view the cmd_ready handshake wasn't performed. Symmetrically locality has to be relinquished only after going idle handshake has completed, this requires that go_idle has to poll for the completion and as well locality relinquish has to poll for completion so it is not overridden in back to back commands flow. The issue is only visible on devices that support multiple localities. Signed-off-by: Tomas Winkler Tested-by: Jarkko Sakkinen --- V2: poll for locality relinquish completion V3: 1. Print error message upon locality relinquish failure 2. Don't override rc code on error path with locality relinquish return value. drivers/char/tpm/tpm-interface.c | 21 +++++--- drivers/char/tpm/tpm_crb.c | 108 +++++++++++++++++++++++++++------------ drivers/char/tpm/tpm_tis_core.c | 4 +- include/linux/tpm.h | 2 +- 4 files changed, 94 insertions(+), 41 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 9e80a953d693..f47b29c1a963 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -422,8 +422,6 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, if (!(flags & TPM_TRANSMIT_UNLOCKED)) mutex_lock(&chip->tpm_mutex); - if (chip->dev.parent) - pm_runtime_get_sync(chip->dev.parent); if (chip->ops->clk_enable != NULL) chip->ops->clk_enable(chip, true); @@ -439,6 +437,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, chip->locality = rc; } + if (chip->dev.parent) + pm_runtime_get_sync(chip->dev.parent); + rc = tpm2_prepare_space(chip, space, ordinal, buf); if (rc) goto out; @@ -499,17 +500,25 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, rc = tpm2_commit_space(chip, space, ordinal, buf, &len); out: + if (chip->dev.parent) + pm_runtime_put_sync(chip->dev.parent); + if (need_locality && chip->ops->relinquish_locality) { - chip->ops->relinquish_locality(chip, chip->locality); + /* this coud be on error path, don't override error code */ + int l_rc = chip->ops->relinquish_locality(chip, chip->locality); + + if (l_rc) { + dev_err(&chip->dev, "%s: relinquish_locality: error %d\n", + __func__, l_rc); + rc = l_rc; + } chip->locality = -1; } + out_no_locality: if (chip->ops->clk_enable != NULL) chip->ops->clk_enable(chip, false); - if (chip->dev.parent) - pm_runtime_put_sync(chip->dev.parent); - if (!(flags & TPM_TRANSMIT_UNLOCKED)) mutex_unlock(&chip->tpm_mutex); return rc ? rc : len; diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index 7b3c2a8aa9de..497edd9848cd 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -112,6 +112,25 @@ struct tpm2_crb_smc { u32 smc_func_id; }; +static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value, + unsigned long timeout) +{ + ktime_t start; + ktime_t stop; + + start = ktime_get(); + stop = ktime_add(start, ms_to_ktime(timeout)); + + do { + if ((ioread32(reg) & mask) == value) + return true; + + usleep_range(50, 100); + } while (ktime_before(ktime_get(), stop)); + + return ((ioread32(reg) & mask) == value); +} + /** * crb_go_idle - request tpm crb device to go the idle state * @@ -128,7 +147,7 @@ struct tpm2_crb_smc { * * Return: 0 always */ -static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv) +static int crb_go_idle(struct device *dev, struct crb_priv *priv) { if ((priv->sm == ACPI_TPM2_START_METHOD) || (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) || @@ -136,30 +155,17 @@ static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv) return 0; iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req); - /* we don't really care when this settles */ + if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req, + CRB_CTRL_REQ_GO_IDLE/* mask */, + 0, /* value */ + TPM2_TIMEOUT_C)) { + dev_warn(dev, "goIdle timed out\n"); + return -ETIME; + } return 0; } -static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value, - unsigned long timeout) -{ - ktime_t start; - ktime_t stop; - - start = ktime_get(); - stop = ktime_add(start, ms_to_ktime(timeout)); - - do { - if ((ioread32(reg) & mask) == value) - return true; - - usleep_range(50, 100); - } while (ktime_before(ktime_get(), stop)); - - return false; -} - /** * crb_cmd_ready - request tpm crb device to enter ready state * @@ -175,8 +181,7 @@ static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value, * * Return: 0 on success -ETIME on timeout; */ -static int __maybe_unused crb_cmd_ready(struct device *dev, - struct crb_priv *priv) +static int crb_cmd_ready(struct device *dev, struct crb_priv *priv) { if ((priv->sm == ACPI_TPM2_START_METHOD) || (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) || @@ -195,11 +200,11 @@ static int __maybe_unused crb_cmd_ready(struct device *dev, return 0; } -static int crb_request_locality(struct tpm_chip *chip, int loc) +static int __crb_request_locality(struct device *dev, + struct crb_priv *priv, int loc) { - struct crb_priv *priv = dev_get_drvdata(&chip->dev); u32 value = CRB_LOC_STATE_LOC_ASSIGNED | - CRB_LOC_STATE_TPM_REG_VALID_STS; + CRB_LOC_STATE_TPM_REG_VALID_STS; if (!priv->regs_h) return 0; @@ -207,21 +212,45 @@ static int crb_request_locality(struct tpm_chip *chip, int loc) iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl); if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value, TPM2_TIMEOUT_C)) { - dev_warn(&chip->dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); + dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); return -ETIME; } return 0; } -static void crb_relinquish_locality(struct tpm_chip *chip, int loc) +static int crb_request_locality(struct tpm_chip *chip, int loc) { struct crb_priv *priv = dev_get_drvdata(&chip->dev); + return __crb_request_locality(&chip->dev, priv, loc); +} + +static int __crb_relinquish_locality(struct device *dev, + struct crb_priv *priv, int loc) +{ + u32 mask = CRB_LOC_STATE_LOC_ASSIGNED | + CRB_LOC_STATE_TPM_REG_VALID_STS; + u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS; + if (!priv->regs_h) - return; + return 0; iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl); + if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value, + TPM2_TIMEOUT_C)) { + dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); + return -ETIME; + } + + return 0; +} + +static int crb_relinquish_locality(struct tpm_chip *chip, int loc) +{ + struct crb_priv *priv = dev_get_drvdata(&chip->dev); + + return __crb_relinquish_locality(&chip->dev, priv, loc); } static u8 crb_status(struct tpm_chip *chip) @@ -475,6 +504,10 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, dev_warn(dev, FW_BUG "Bad ACPI memory layout"); } + ret = __crb_request_locality(dev, priv, 0); + if (ret) + return ret; + priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address, sizeof(struct crb_regs_tail)); if (IS_ERR(priv->regs_t)) @@ -531,6 +564,8 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, crb_go_idle(dev, priv); + __crb_relinquish_locality(dev, priv, 0); + return ret; } @@ -588,10 +623,14 @@ static int crb_acpi_add(struct acpi_device *device) chip->acpi_dev_handle = device->handle; chip->flags = TPM_CHIP_FLAG_TPM2; - rc = crb_cmd_ready(dev, priv); + rc = __crb_request_locality(dev, priv, 0); if (rc) return rc; + rc = crb_cmd_ready(dev, priv); + if (rc) + goto out; + pm_runtime_get_noresume(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); @@ -601,12 +640,15 @@ static int crb_acpi_add(struct acpi_device *device) crb_go_idle(dev, priv); pm_runtime_put_noidle(dev); pm_runtime_disable(dev); - return rc; + goto out; } - pm_runtime_put(dev); + pm_runtime_put_sync(dev); - return 0; +out: + __crb_relinquish_locality(dev, priv, 0); + + return rc; } static int crb_acpi_remove(struct acpi_device *device) diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 183a5f54d875..a22b12adbdfd 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -143,11 +143,13 @@ static bool check_locality(struct tpm_chip *chip, int l) return false; } -static void release_locality(struct tpm_chip *chip, int l) +static int release_locality(struct tpm_chip *chip, int l) { struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY); + + return 0; } static int request_locality(struct tpm_chip *chip, int l) diff --git a/include/linux/tpm.h b/include/linux/tpm.h index bcdd3790e94d..06639fb6ab85 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -44,7 +44,7 @@ struct tpm_class_ops { bool (*update_timeouts)(struct tpm_chip *chip, unsigned long *timeout_cap); int (*request_locality)(struct tpm_chip *chip, int loc); - void (*relinquish_locality)(struct tpm_chip *chip, int loc); + int (*relinquish_locality)(struct tpm_chip *chip, int loc); void (*clk_enable)(struct tpm_chip *chip, bool value); };