From patchwork Wed Jun 20 16:19:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 10477833 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 4E53560230 for ; Wed, 20 Jun 2018 16:20:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3151428F3F for ; Wed, 20 Jun 2018 16:20:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BCCEE28F67; Wed, 20 Jun 2018 16:20:22 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham 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 C1D6328F45 for ; Wed, 20 Jun 2018 16:20:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754444AbeFTQUG (ORCPT ); Wed, 20 Jun 2018 12:20:06 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:33364 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754417AbeFTQUD (ORCPT ); Wed, 20 Jun 2018 12:20:03 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w5KGEBg6082985 for ; Wed, 20 Jun 2018 12:20:03 -0400 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0b-001b2d01.pphosted.com with ESMTP id 2jqsbntqyd-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 20 Jun 2018 12:20:02 -0400 Received: from localhost by e33.co.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) Wed, 20 Jun 2018 10:19:59 -0600 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w5KGJwYr18678258 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 20 Jun 2018 09:19:59 -0700 Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DD1EDC6059; Wed, 20 Jun 2018 10:19:58 -0600 (MDT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4957DC605A; Wed, 20 Jun 2018 10:19:58 -0600 (MDT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 20 Jun 2018 10:19:58 -0600 (MDT) From: Stefan Berger To: linux-integrity@vger.kernel.org, jarkko.sakkinen@linux.intel.com, zohar@linux.vnet.ibm.com Cc: jgg@ziepe.ca, linux-kernel@vger.kernel.org, Stefan Berger Subject: [PATCH 3/6] tpm: Implement tpm_chip_find() for other subsystems to call Date: Wed, 20 Jun 2018 12:19:45 -0400 X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180620161948.1464255-1-stefanb@linux.vnet.ibm.com> References: <20180620161948.1464255-1-stefanb@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18062016-0036-0000-0000-00000A017595 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009227; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000265; SDB=6.01049782; UDB=6.00537934; IPR=6.00828754; MB=3.00021761; MTD=3.00000008; XFM=3.00000015; UTC=2018-06-20 16:20:01 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18062016-0037-0000-0000-000047CF0B6C Message-Id: <20180620161948.1464255-4-stefanb@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-06-20_07:, , 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1805220000 definitions=main-1806200179 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Implement tpm_chip_find() for other subsystems to find a TPM chip and get a reference to that chip. Once done with using the chip, the reference is released using tpm_chip_put(). Signed-off-by: Stefan Berger --- drivers/char/tpm/tpm-chip.c | 27 +++++++++++++++++++++++++++ include/linux/tpm.h | 5 +++++ 2 files changed, 32 insertions(+) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 23b667c730f6..b04064291dab 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -84,6 +84,33 @@ void tpm_put_ops(struct tpm_chip *chip) EXPORT_SYMBOL_GPL(tpm_put_ops); /** + * tpm_chip_find() - find a TPM chip and get a reference to it + */ +struct tpm_chip *tpm_chip_find(void) +{ + struct tpm_chip *chip, *res = NULL; + int chip_num = 0; + int chip_prev; + + mutex_lock(&idr_lock); + + do { + chip_prev = chip_num; + chip = idr_get_next(&dev_nums_idr, &chip_num); + if (chip) { + kref_get(&chip->kref); + res = chip; + break; + } + } while (chip_prev != chip_num); + + mutex_unlock(&idr_lock); + + return res; +} +EXPORT_SYMBOL_GPL(tpm_chip_find); + +/** * tpm_chip_find_get() - find and reserve a TPM chip * @chip: a &struct tpm_chip instance, %NULL for the default chip * diff --git a/include/linux/tpm.h b/include/linux/tpm.h index cdb3ecdfc933..f0d1abcaf4af 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -61,6 +61,7 @@ extern int tpm_seal_trusted(struct tpm_chip *chip, extern int tpm_unseal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); +extern struct tpm_chip *tpm_chip_find(void); extern void tpm_chip_put(struct tpm_chip *chip); #else static inline int tpm_is_tpm2(struct tpm_chip *chip) @@ -97,6 +98,10 @@ static inline int tpm_unseal_trusted(struct tpm_chip *chip, { return -ENODEV; } +static inline struct tpm_chip *tpm_chip_find(void) +{ + return NULL; +} static inline void tpm_chip_put(struct tpm_chip *chip) { }