Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932192AbdCJX6W (ORCPT ); Fri, 10 Mar 2017 18:58:22 -0500 Received: from mga14.intel.com ([192.55.52.115]:17421 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755108AbdCJX6P (ORCPT ); Fri, 10 Mar 2017 18:58:15 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.36,143,1486454400"; d="scan'208";a="1140726755" From: Jarkko Sakkinen To: tpmdd-devel@lists.sourceforge.net Cc: linux-security-module@vger.kernel.org, Jerry Snitselaar , gang.wei@intel.com, Jarkko Sakkinen , Peter Huewe , Marcel Selhorst , Jason Gunthorpe , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] tpm_crb: request and relinquish locality 0 Date: Sat, 11 Mar 2017 01:58:00 +0200 Message-Id: <20170310235802.30765-1-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.9.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3779 Lines: 130 Added two new callbacks to struct tpm_class_ops: - request_locality - relinquish_locality These are called before sending and receiving data from the TPM. Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 9 +++++++++ drivers/char/tpm/tpm_crb.c | 41 +++++++++++++++++++++++++++++++++++++++- include/linux/tpm.h | 3 ++- 3 files changed, 51 insertions(+), 2 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index bd2128e..ae6aafa 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -369,6 +369,12 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, if (chip->dev.parent) pm_runtime_get_sync(chip->dev.parent); + if (chip->ops->request_locality) { + rc = chip->ops->request_locality(chip); + if (rc) + goto out; + } + rc = chip->ops->send(chip, (u8 *) buf, count); if (rc < 0) { dev_err(&chip->dev, @@ -410,6 +416,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %zd\n", rc); out: + if (chip->ops->relinquish_locality) + chip->ops->relinquish_locality(chip); + if (chip->dev.parent) pm_runtime_put_sync(chip->dev.parent); diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index 3245618..89dc8a176 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -34,6 +34,15 @@ enum crb_defaults { CRB_ACPI_START_INDEX = 1, }; +enum crb_loc_ctrl { + CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0), + CRB_LOC_CTRL_RELINQUISH = BIT(1), +}; + +enum crb_loc_state { + CRB_LOC_STATE_LOC_ASSIGNED = BIT(1), +}; + enum crb_ctrl_req { CRB_CTRL_REQ_CMD_READY = BIT(0), CRB_CTRL_REQ_GO_IDLE = BIT(1), @@ -172,6 +181,35 @@ static int __maybe_unused crb_cmd_ready(struct device *dev, return 0; } +static int crb_request_locality(struct tpm_chip *chip) +{ + struct crb_priv *priv = dev_get_drvdata(&chip->dev); + + if (!priv->regs_h) + return 0; + + iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl); + if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, + CRB_LOC_STATE_LOC_ASSIGNED, /* mask */ + CRB_LOC_STATE_LOC_ASSIGNED, /* value */ + TPM2_TIMEOUT_C)) { + dev_warn(&chip->dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); + return -ETIME; + } + + return 0; +} + +static void crb_relinquish_locality(struct tpm_chip *chip) +{ + struct crb_priv *priv = dev_get_drvdata(&chip->dev); + + if (!priv->regs_h) + return; + + iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl); +} + static u8 crb_status(struct tpm_chip *chip) { struct crb_priv *priv = dev_get_drvdata(&chip->dev); @@ -198,7 +236,6 @@ static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count) memcpy_fromio(buf, priv->rsp, 6); expected = be32_to_cpup((__be32 *) &buf[2]); - if (expected > count) return -EIO; @@ -279,6 +316,8 @@ static const struct tpm_class_ops tpm_crb = { .send = crb_send, .cancel = crb_cancel, .req_canceled = crb_req_canceled, + .request_locality = crb_request_locality, + .relinquish_locality = crb_relinquish_locality, .req_complete_mask = CRB_DRV_STS_COMPLETE, .req_complete_val = CRB_DRV_STS_COMPLETE, }; diff --git a/include/linux/tpm.h b/include/linux/tpm.h index da158f0..0ac6ea6 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -48,7 +48,8 @@ struct tpm_class_ops { u8 (*status) (struct tpm_chip *chip); bool (*update_timeouts)(struct tpm_chip *chip, unsigned long *timeout_cap); - + int (*request_locality)(struct tpm_chip *chip); + void (*relinquish_locality)(struct tpm_chip *chip); }; #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE) -- 2.9.3