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Subject: Re: [PATCH v4 11/21] tpm: factor out tpm_startup function
To:     Tomas Winkler <tomas.winkler@intel.com>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Jason Gunthorpe <jgg@ziepe.ca>
Cc:     Alexander Usyskin <alexander.usyskin@intel.com>,
        Tadeusz Struk <tadeusz.struk@intel.com>,
        linux-integrity@vger.kernel.org,
        linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20180921135820.20549-1-tomas.winkler@intel.com>
 <20180921135820.20549-12-tomas.winkler@intel.com>
From:   Nayna Jain <nayna@linux.vnet.ibm.com>
Date:   Mon, 24 Sep 2018 20:21:10 +0530
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On 09/21/2018 07:28 PM, Tomas Winkler wrote:
> TPM manual startup is used only from within TPM 1.x or TPM 2.x
> code, hence remove tpm_startup() function from tpm-interface.c
> and add two static functions implementations tpm1_startup()
> and tpm2_startup() into to tpm1-cmd.c and tpm2-cmd.c respectively.
>
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> Tested-by: Jarkko Sakkine <jarkko.sakkinen@linux.intel.com>

Typo in Jarkko's last name -  "Sakkinen"

Thanks & Regards,
     - Nayna

> ---
> V2-V3: Resend.
> V4: Fix the commit message.
>
>   drivers/char/tpm/tpm-interface.c | 41 ----------------------------------------
>   drivers/char/tpm/tpm.h           |  1 -
>   drivers/char/tpm/tpm1-cmd.c      | 37 +++++++++++++++++++++++++++++++++++-
>   drivers/char/tpm/tpm2-cmd.c      | 34 +++++++++++++++++++++++++++++++--
>   4 files changed, 68 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index dfa972bbdd81..686b5316dad5 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -413,47 +413,6 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
>   }
>   EXPORT_SYMBOL_GPL(tpm_transmit_cmd);
>
> -#define TPM_ORD_STARTUP 153
> -#define TPM_ST_CLEAR 1
> -
> -/**
> - * tpm_startup - turn on the TPM
> - * @chip: TPM chip to use
> - *
> - * Normally the firmware should start the TPM. This function is provided as a
> - * workaround if this does not happen. A legal case for this could be for
> - * example when a TPM emulator is used.
> - *
> - * Return: same as tpm_transmit_cmd()
> - */
> -int tpm_startup(struct tpm_chip *chip)
> -{
> -	struct tpm_buf buf;
> -	int rc;
> -
> -	dev_info(&chip->dev, "starting up the TPM manually\n");
> -
> -	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> -		rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP);
> -		if (rc < 0)
> -			return rc;
> -
> -		tpm_buf_append_u16(&buf, TPM2_SU_CLEAR);
> -	} else {
> -		rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP);
> -		if (rc < 0)
> -			return rc;
> -
> -		tpm_buf_append_u16(&buf, TPM_ST_CLEAR);
> -	}
> -
> -	rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
> -			      "attempting to start the TPM");
> -
> -	tpm_buf_destroy(&buf);
> -	return rc;
> -}
> -
>   int tpm_get_timeouts(struct tpm_chip *chip)
>   {
>   	if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 862c9262e037..fa88102a0cab 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -540,7 +540,6 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
>   			 void *buf, size_t bufsiz,
>   			 size_t min_rsp_body_length, unsigned int flags,
>   			 const char *desc);
> -int tpm_startup(struct tpm_chip *chip);
>   int tpm_get_timeouts(struct tpm_chip *);
>
>   int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr);
> diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
> index d118adbcd2a7..6deae4595277 100644
> --- a/drivers/char/tpm/tpm1-cmd.c
> +++ b/drivers/char/tpm/tpm1-cmd.c
> @@ -308,6 +308,40 @@ unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
>   		return duration;
>   }
>
> +#define TPM_ORD_STARTUP 153
> +#define TPM_ST_CLEAR 1
> +
> +/**
> + * tpm_startup - turn on the TPM
> + * @chip: TPM chip to use
> + *
> + * Normally the firmware should start the TPM. This function is provided as a
> + * workaround if this does not happen. A legal case for this could be for
> + * example when a TPM emulator is used.
> + *
> + * Return: same as tpm_transmit_cmd()
> + */
> +static int tpm1_startup(struct tpm_chip *chip)
> +{
> +	struct tpm_buf buf;
> +	int rc;
> +
> +	dev_info(&chip->dev, "starting up the TPM manually\n");
> +
> +	rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP);
> +	if (rc < 0)
> +		return rc;
> +
> +	tpm_buf_append_u16(&buf, TPM_ST_CLEAR);
> +
> +	rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
> +			      "attempting to start the TPM");
> +
> +	tpm_buf_destroy(&buf);
> +
> +	return rc;
> +}
> +
>   int tpm1_get_timeouts(struct tpm_chip *chip)
>   {
>   	cap_t cap;
> @@ -317,7 +351,7 @@ int tpm1_get_timeouts(struct tpm_chip *chip)
>   	rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
>   			 sizeof(cap.timeout));
>   	if (rc == TPM_ERR_INVALID_POSTINIT) {
> -		if (tpm_startup(chip))
> +		if (tpm1_startup(chip))
>   			return rc;
>
>   		rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> @@ -726,3 +760,4 @@ int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr)
>
>   	return rc;
>   }
> +
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 65ce463a6f92..8da5a16e7c8c 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -943,6 +943,36 @@ static int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
>   	return rc;
>   }
>
> +/**
> + * tpm2_startup - turn on the TPM
> + * @chip: TPM chip to use
> + *
> + * Normally the firmware should start the TPM. This function is provided as a
> + * workaround if this does not happen. A legal case for this could be for
> + * example when a TPM emulator is used.
> + *
> + * Return: same as tpm_transmit_cmd()
> + */
> +
> +static int tpm2_startup(struct tpm_chip *chip)
> +{
> +	struct tpm_buf buf;
> +	int rc;
> +
> +	dev_info(&chip->dev, "starting up the TPM manually\n");
> +
> +	rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP);
> +	if (rc < 0)
> +		return rc;
> +
> +	tpm_buf_append_u16(&buf, TPM2_SU_CLEAR);
> +	rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
> +			      "attempting to start the TPM");
> +	tpm_buf_destroy(&buf);
> +
> +	return rc;
> +}
> +
>   /**
>    * tpm2_auto_startup - Perform the standard automatic TPM initialization
>    *                     sequence
> @@ -954,7 +984,7 @@ int tpm2_auto_startup(struct tpm_chip *chip)
>   {
>   	int rc;
>
> -	rc = tpm_get_timeouts(chip);
> +	rc = tpm2_get_timeouts(chip);
>   	if (rc)
>   		goto out;
>
> @@ -963,7 +993,7 @@ int tpm2_auto_startup(struct tpm_chip *chip)
>   		goto out;
>
>   	if (rc == TPM2_RC_INITIALIZE) {
> -		rc = tpm_startup(chip);
> +		rc = tpm2_startup(chip);
>   		if (rc)
>   			goto out;
>