linux-kernel - Re: [PATCH v13 16/19] tpm, tpm_tis: Allow locality to be set to a different value

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Message-ID: <40d90268-272c-45b1-add5-220e9e162101@oracle.com>
Date: Sun, 13 Apr 2025 00:45:52 +0530
From: ALOK TIWARI <alok.a.tiwari@...cle.com>
To: Ross Philipson <ross.philipson@...cle.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-integrity@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-crypto@...r.kernel.org,
        kexec@...ts.infradead.org, linux-efi@...r.kernel.org,
        iommu@...ts.linux.dev
Cc: dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com,
        ardb@...nel.org, mjg59@...f.ucam.org,
        James.Bottomley@...senpartnership.com, peterhuewe@....de,
        jarkko@...nel.org, jgg@...pe.ca, luto@...capital.net,
        nivedita@...m.mit.edu, herbert@...dor.apana.org.au,
        davem@...emloft.net, corbet@....net, ebiederm@...ssion.com,
        dwmw2@...radead.org, baolu.lu@...ux.intel.com,
        kanth.ghatraju@...cle.com, andrew.cooper3@...rix.com,
        trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v13 16/19] tpm, tpm_tis: Allow locality to be set to a
 different value



On 11-04-2025 02:11, Ross Philipson wrote:
> DRTM needs to be able to set the locality used by kernel. Provide
> a one-shot function tpm_chip_set_locality() for the purpose.
> 
> Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> ---
>   drivers/char/tpm/tpm-chip.c     | 33 ++++++++++++++++++++++++++++++++-
>   drivers/char/tpm/tpm_tis_core.c |  2 ++
>   include/linux/tpm.h             |  4 ++++
>   3 files changed, 38 insertions(+), 1 deletion(-)
> 
> +/**
> + * tpm_chip_set_locality() - Set the TPM locality kernel uses
> + * @chip:	&tpm_chip instance
> + * @locality:   new locality
> + *
> + * This a one-shot function. Returns zero or POSIX error on failure.
> + */
> +int tpm_chip_set_locality(struct tpm_chip *chip, u8 locality)
> +{
> +	int ret;
> +
> +	if (locality < 0 || locality >= TPM_MAX_LOCALITY)
> +		return -EINVAL;
> +
> +	ret = tpm_try_get_ops(chip);
> +	if (ret)
> +		return ret;
> +
> +	if (!(chip->flags & TPM_CHIP_FLAG_SET_LOCALITY_ENABLED)) {
> +		tpm_put_ops(chip);
> +		return -EINVAL;
> +	}
> +
> +	chip->kernel_locality = locality;
> +	chip->flags &= ~TPM_CHIP_FLAG_SET_LOCALITY_ENABLED;
> +	tpm_put_ops(chip);
> +	return 0;

a '\n' before return is customary

> +}
> +EXPORT_SYMBOL_GPL(tpm_chip_set_locality);
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c


Thanks,
Alok