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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC890C43441 for ; Fri, 16 Nov 2018 17:02:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B16412086B for ; Fri, 16 Nov 2018 17:02:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B16412086B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-security-module-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390156AbeKQDPk (ORCPT ); Fri, 16 Nov 2018 22:15:40 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:51066 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729055AbeKQDPk (ORCPT ); Fri, 16 Nov 2018 22:15:40 -0500 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wAGGxCOQ124269 for ; Fri, 16 Nov 2018 12:02:28 -0500 Received: from e17.ny.us.ibm.com (e17.ny.us.ibm.com [129.33.205.207]) by mx0b-001b2d01.pphosted.com with ESMTP id 2nt1182k19-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 16 Nov 2018 12:02:27 -0500 Received: from localhost by e17.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 16 Nov 2018 17:02:18 -0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wAGH2HX143384858 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 16 Nov 2018 17:02:17 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B68E4AC05F; Fri, 16 Nov 2018 17:02:17 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9ED6BAC065; Fri, 16 Nov 2018 17:02:17 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 16 Nov 2018 17:02:17 +0000 (GMT) Subject: Re: [PATCH v8 16/17] tpm: take TPM chip power gating out of tpm_transmit() To: Jarkko Sakkinen , linux-integrity@vger.kernel.org Cc: linux-security-module@vger.kernel.org, James Bottomley , Tomas Winkler , Tadeusz Struk , Stefan Berger , Nayna Jain , Peter Huewe , Jason Gunthorpe , Arnd Bergmann , Greg Kroah-Hartman , open list References: <20181116123845.15705-1-jarkko.sakkinen@linux.intel.com> <20181116123845.15705-17-jarkko.sakkinen@linux.intel.com> From: Stefan Berger Date: Fri, 16 Nov 2018 12:02:17 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <20181116123845.15705-17-jarkko.sakkinen@linux.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-MW X-TM-AS-GCONF: 00 x-cbid: 18111617-0040-0000-0000-00000493A89E X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010062; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000270; SDB=6.01118355; UDB=6.00577119; IPR=6.00898464; MB=3.00024196; MTD=3.00000008; XFM=3.00000015; UTC=2018-11-16 17:02:21 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111617-0041-0000-0000-0000089CB510 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-16_10:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=862 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811160151 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On 11/16/18 7:38 AM, Jarkko Sakkinen wrote: > Call tpm_chip_start() and tpm_chip_stop() in > > * tpm_try_get_ops() and tpm_put_ops() > * tpm_chip_register() > * tpm2_del_space() > > And remove these calls from tpm_transmit(). The core reason for this > change is that in tpm_vtpm_proxy a locality change requires a virtual > TPM command (a command made up just for that driver). > > The consequence of this is that this commit removes the remaining nested > calls. > > Signed-off-by: Jarkko Sakkinen > --- > drivers/char/tpm/tpm-chip.c | 21 ++++++++------------- > drivers/char/tpm/tpm-interface.c | 4 ---- > drivers/char/tpm/tpm.h | 9 --------- > drivers/char/tpm/tpm2-space.c | 5 ++++- > drivers/char/tpm/tpm_vtpm_proxy.c | 3 +-- > 5 files changed, 13 insertions(+), 29 deletions(-) > > diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c > index 65f1561eba81..837d44fa0797 100644 > --- a/drivers/char/tpm/tpm-chip.c > +++ b/drivers/char/tpm/tpm-chip.c > @@ -41,9 +41,6 @@ static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags) > { > int rc; > > - if (flags & TPM_TRANSMIT_NESTED) > - return 0; > - > if (!chip->ops->request_locality) > return 0; > > @@ -59,9 +56,6 @@ static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags) > { > int rc; > > - if (flags & TPM_TRANSMIT_NESTED) > - return; > - > if (!chip->ops->relinquish_locality) > return; > > @@ -74,9 +68,6 @@ static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags) > > static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags) > { > - if (flags & TPM_TRANSMIT_NESTED) > - return 0; > - > if (!chip->ops->cmd_ready) > return 0; > > @@ -85,9 +76,6 @@ static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags) > > static int tpm_go_idle(struct tpm_chip *chip, unsigned int flags) > { > - if (flags & TPM_TRANSMIT_NESTED) > - return 0; > - > if (!chip->ops->go_idle) > return 0; > > @@ -169,7 +157,9 @@ int tpm_try_get_ops(struct tpm_chip *chip) > goto out_lock; > > mutex_lock(&chip->tpm_mutex); > - return 0; > + rc = tpm_chip_start(chip, 0); > + if (rc) > + mutex_unlock(&chip->tpm_mutex); This cannot be right to fall through to up_read() etc. > out_lock: > up_read(&chip->ops_sem); > put_device(&chip->dev); > @@ -186,6 +176,7 @@ EXPORT_SYMBOL_GPL(tpm_try_get_ops); > */ > void tpm_put_ops(struct tpm_chip *chip) > { > + tpm_chip_stop(chip, 0); > mutex_unlock(&chip->tpm_mutex); > up_read(&chip->ops_sem); > put_device(&chip->dev); > @@ -563,7 +554,11 @@ int tpm_chip_register(struct tpm_chip *chip) > { > int rc; > > + rc = tpm_chip_start(chip, 0); > + if (rc) > + return rc; > rc = tpm_auto_startup(chip); > + tpm_chip_stop(chip, 0); > if (rc) > return rc; > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c > index 2c79284ffd4e..21ac8da94d90 100644 > --- a/drivers/char/tpm/tpm-interface.c > +++ b/drivers/char/tpm/tpm-interface.c > @@ -168,11 +168,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz, > memcpy(save, buf, save_size); > > for (;;) { > - ret = tpm_chip_start(chip, flags); > - if (ret) > - return ret; > ret = tpm_try_transmit(chip, buf, bufsiz, flags); > - tpm_chip_stop(chip, flags); > if (ret < 0) > break; > rc = be32_to_cpu(header->return_code); > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h > index c42a75710b70..f9d56dfd0d20 100644 > --- a/drivers/char/tpm/tpm.h > +++ b/drivers/char/tpm/tpm.h > @@ -485,15 +485,6 @@ extern const struct file_operations tpm_fops; > extern const struct file_operations tpmrm_fops; > extern struct idr dev_nums_idr; > > -/** > - * enum tpm_transmit_flags - flags for tpm_transmit() > - * > - * %TPM_TRANSMIT_NESTED: discard setup steps (power management, locality) > - */ > -enum tpm_transmit_flags { > - TPM_TRANSMIT_NESTED = BIT(0), > -}; > - > ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz, > unsigned int flags); > ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf, > diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c > index ced1dc91ba6f..d913715d30aa 100644 > --- a/drivers/char/tpm/tpm2-space.c > +++ b/drivers/char/tpm/tpm2-space.c > @@ -60,7 +60,10 @@ int tpm2_init_space(struct tpm_space *space) > void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space) > { > mutex_lock(&chip->tpm_mutex); > - tpm2_flush_sessions(chip, space); > + if (!tpm_chip_start(chip, 0)) { > + tpm2_flush_sessions(chip, space); > + tpm_chip_stop(chip, 0); > + } > mutex_unlock(&chip->tpm_mutex); > kfree(space->context_buf); > kfree(space->session_buf); > diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c > index e8a1da2810a9..a4bb60e163cc 100644 > --- a/drivers/char/tpm/tpm_vtpm_proxy.c > +++ b/drivers/char/tpm/tpm_vtpm_proxy.c > @@ -417,8 +417,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality) > > proxy_dev->state |= STATE_DRIVER_COMMAND; > > - rc = tpm_transmit_cmd(chip, &buf, 0, TPM_TRANSMIT_NESTED, > - "attempting to set locality"); > + rc = tpm_transmit_cmd(chip, &buf, 0, 0, "attempting to set locality"); > > proxy_dev->state &= ~STATE_DRIVER_COMMAND; >