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Wed, 14 Feb 2024 22:31:44 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 3w5yk9n7ew-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 14 Feb 2024 22:31:44 +0000 Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 41EMVTVI004281; Wed, 14 Feb 2024 22:31:43 GMT Received: from bur-virt-x6-2-100.us.oracle.com (bur-virt-x6-2-100.us.oracle.com [10.153.92.40]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 3w5yk9n72r-13 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 14 Feb 2024 22:31:43 +0000 From: Ross Philipson To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org Cc: ross.philipson@oracle.com, dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, ardb@kernel.org, mjg59@srcf.ucam.org, James.Bottomley@hansenpartnership.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, luto@amacapital.net, nivedita@alum.mit.edu, herbert@gondor.apana.org.au, davem@davemloft.net, kanth.ghatraju@oracle.com, trenchboot-devel@googlegroups.com Subject: [PATCH v8 12/15] tpm: Add ability to set the preferred locality the TPM chip uses Date: Wed, 14 Feb 2024 14:18:44 -0800 Message-Id: <20240214221847.2066632-13-ross.philipson@oracle.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240214221847.2066632-1-ross.philipson@oracle.com> References: <20240214221847.2066632-1-ross.philipson@oracle.com> Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-14_14,2024-02-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 phishscore=0 mlxscore=0 bulkscore=0 spamscore=0 malwarescore=0 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402140170 X-Proofpoint-ORIG-GUID: 6u0qho0pdR5oLqVesCM1T1HwwPG9_4kP X-Proofpoint-GUID: 6u0qho0pdR5oLqVesCM1T1HwwPG9_4kP Curently the locality is hard coded to 0 but for DRTM support, access is needed to localities 1 through 4. Signed-off-by: Ross Philipson --- drivers/char/tpm/tpm-chip.c | 24 +++++++++++++++++++++++- drivers/char/tpm/tpm-interface.c | 15 +++++++++++++++ drivers/char/tpm/tpm.h | 1 + include/linux/tpm.h | 10 ++++++++++ 4 files changed, 49 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 42b1062e33cd..e4d591e8857b 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -44,7 +44,7 @@ static int tpm_request_locality(struct tpm_chip *chip) if (!chip->ops->request_locality) return 0; - rc = chip->ops->request_locality(chip, 0); + rc = chip->ops->request_locality(chip, chip->pref_locality); if (rc < 0) return rc; @@ -143,6 +143,27 @@ void tpm_chip_stop(struct tpm_chip *chip) } EXPORT_SYMBOL_GPL(tpm_chip_stop); +/** + * tpm_chip_preferred_locality() - set the TPM chip preferred locality to open + * @chip: a TPM chip to use + * @locality: the preferred locality + * + * Return: + * * true - Preferred locality set + * * false - Invalid locality specified + */ +bool tpm_chip_preferred_locality(struct tpm_chip *chip, int locality) +{ + if (locality < 0 || locality >=TPM_MAX_LOCALITY) + return false; + + mutex_lock(&chip->tpm_mutex); + chip->pref_locality = locality; + mutex_unlock(&chip->tpm_mutex); + return true; +} +EXPORT_SYMBOL_GPL(tpm_chip_preferred_locality); + /** * tpm_try_get_ops() - Get a ref to the tpm_chip * @chip: Chip to ref @@ -368,6 +389,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev, } chip->locality = -1; + chip->pref_locality = 0; return chip; out: diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 66b16d26eecc..7a758c6d6d09 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -273,6 +273,21 @@ int tpm_is_tpm2(struct tpm_chip *chip) } EXPORT_SYMBOL_GPL(tpm_is_tpm2); +/** + * tpm_preferred_locality() - set the TPM chip preferred locality to open + * @chip: a TPM chip to use + * @locality: the preferred locality + * + * Return: + * * true - Preferred locality set + * * false - Invalid locality specified + */ +bool tpm_preferred_locality(struct tpm_chip *chip, int locality) +{ + return tpm_chip_preferred_locality(chip, locality); +} +EXPORT_SYMBOL_GPL(tpm_preferred_locality); + /** * tpm_pcr_read - read a PCR value from SHA1 bank * @chip: a &struct tpm_chip instance, %NULL for the default chip diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 61445f1dc46d..389b117e68c2 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -267,6 +267,7 @@ static inline void tpm_msleep(unsigned int delay_msec) int tpm_chip_bootstrap(struct tpm_chip *chip); int tpm_chip_start(struct tpm_chip *chip); void tpm_chip_stop(struct tpm_chip *chip); +bool tpm_chip_preferred_locality(struct tpm_chip *chip, int locality); struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip); struct tpm_chip *tpm_chip_alloc(struct device *dev, diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 4ee9d13749ad..a61d4e5e4b2d 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -116,6 +116,12 @@ struct tpm_chip_seqops { const struct seq_operations *seqops; }; +/* + * The maximum locality (0 - 4) for a TPM, as defined in section 3.2 of the + * Client Platform Profile Specification. + */ +#define TPM_MAX_LOCALITY 4 + struct tpm_chip { struct device dev; struct device devs; @@ -170,6 +176,9 @@ struct tpm_chip { /* active locality */ int locality; + + /* preferred locality - default 0 */ + int pref_locality; }; #define TPM_HEADER_SIZE 10 @@ -421,6 +430,7 @@ static inline u32 tpm2_rc_value(u32 rc) #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE) extern int tpm_is_tpm2(struct tpm_chip *chip); +extern bool tpm_preferred_locality(struct tpm_chip *chip, int locality); extern __must_check int tpm_try_get_ops(struct tpm_chip *chip); extern void tpm_put_ops(struct tpm_chip *chip); extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,