linux-kernel - Re: [PATCH] tpm: declare tpm2_get_pcr

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Date:   Fri, 17 Feb 2017 12:24:27 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     tpmdd-devel@...ts.sourceforge.net,
        Nayna Jain <nayna@...ux.vnet.ibm.com>
Cc:     linux-security-module@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: declare tpm2_get_pcr_allocation() as static

On Wed, Feb 15, 2017 at 08:02:28PM +0200, Jarkko Sakkinen wrote:
> There's no need to export tpm2_get_pcr_alloation() because it is only
> a helper function for tpm2_auto_startup(). For the same reason it does
> not make much sense to maintain documentation for it.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Nayna, does this look good to you?

/Jarkko

> ---
>  drivers/char/tpm/tpm.h      |  1 -
>  drivers/char/tpm/tpm2-cmd.c | 94 ++++++++++++++++++++++-----------------------
>  2 files changed, 45 insertions(+), 50 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 6b4e7aa..4937b56 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -554,5 +554,4 @@ int tpm2_auto_startup(struct tpm_chip *chip);
>  void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
>  unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
>  int tpm2_probe(struct tpm_chip *chip);
> -ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
>  #endif
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 10f97e6..881aea9 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -997,61 +997,13 @@ int tpm2_probe(struct tpm_chip *chip)
>  }
>  EXPORT_SYMBOL_GPL(tpm2_probe);
>  
> -/**
> - * tpm2_auto_startup - Perform the standard automatic TPM initialization
> - *                     sequence
> - * @chip: TPM chip to use
> - *
> - * Returns 0 on success, < 0 in case of fatal error.
> - */
> -int tpm2_auto_startup(struct tpm_chip *chip)
> -{
> -	int rc;
> -
> -	rc = tpm_get_timeouts(chip);
> -	if (rc)
> -		goto out;
> -
> -	rc = tpm2_do_selftest(chip);
> -	if (rc != 0 && rc != TPM2_RC_INITIALIZE) {
> -		dev_err(&chip->dev, "TPM self test failed\n");
> -		goto out;
> -	}
> -
> -	if (rc == TPM2_RC_INITIALIZE) {
> -		rc = tpm2_startup(chip, TPM2_SU_CLEAR);
> -		if (rc)
> -			goto out;
> -
> -		rc = tpm2_do_selftest(chip);
> -		if (rc) {
> -			dev_err(&chip->dev, "TPM self test failed\n");
> -			goto out;
> -		}
> -	}
> -
> -	rc = tpm2_get_pcr_allocation(chip);
> -
> -out:
> -	if (rc > 0)
> -		rc = -ENODEV;
> -	return rc;
> -}
> -
>  struct tpm2_pcr_selection {
>  	__be16  hash_alg;
>  	u8  size_of_select;
>  	u8  pcr_select[3];
>  } __packed;
>  
> -/**
> - * tpm2_get_pcr_allocation() - get TPM active PCR banks.
> - *
> - * @chip: TPM chip to use.
> - *
> - * Return: Same as with tpm_transmit_cmd.
> - */
> -ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
> +static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
>  {
>  	struct tpm2_pcr_selection pcr_selection;
>  	struct tpm_buf buf;
> @@ -1114,3 +1066,47 @@ ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
>  
>  	return rc;
>  }
> +
> +/**
> + * tpm2_auto_startup - Perform the standard automatic TPM initialization
> + *                     sequence
> + * @chip: TPM chip to use
> + *
> + * Initializes timeout values for operation and command durations, conducts
> + * a self-test and reads the list of active PCR banks.
> + *
> + * Return: 0 on success. Otherwise, a system error code is returned.
> + */
> +int tpm2_auto_startup(struct tpm_chip *chip)
> +{
> +	int rc;
> +
> +	rc = tpm_get_timeouts(chip);
> +	if (rc)
> +		goto out;
> +
> +	rc = tpm2_do_selftest(chip);
> +	if (rc != 0 && rc != TPM2_RC_INITIALIZE) {
> +		dev_err(&chip->dev, "TPM self test failed\n");
> +		goto out;
> +	}
> +
> +	if (rc == TPM2_RC_INITIALIZE) {
> +		rc = tpm2_startup(chip, TPM2_SU_CLEAR);
> +		if (rc)
> +			goto out;
> +
> +		rc = tpm2_do_selftest(chip);
> +		if (rc) {
> +			dev_err(&chip->dev, "TPM self test failed\n");
> +			goto out;
> +		}
> +	}
> +
> +	rc = tpm2_get_pcr_allocation(chip);
> +
> +out:
> +	if (rc > 0)
> +		rc = -ENODEV;
> +	return rc;
> +}
> -- 
> 2.9.3
> 
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