linux-kernel - Re: [PATCH] tpm: ibmvtpm: Set TPM_OPS_AUTO

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Message-Id: <D4WOWALWYOES.Q12TQS9P30TH@kernel.org>
Date: Wed, 16 Oct 2024 00:15:39 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Stefan Berger" <stefanb@...ux.ibm.com>,
 <linux-integrity@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Cc: <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: ibmvtpm: Set TPM_OPS_AUTO_STARTUP flag on driver

On Mon Oct 14, 2024 at 5:16 PM EEST, Stefan Berger wrote:
> Set the TPM_OPS_AUTO_STARTUP on the driver so that the ibmvtpm driver now
> uses tpm2_auto_startup and tpm1_auto_startup like many other drivers do.
> Remove tpm_get_timeouts, tpm2_get_cc_attrs_tbl, and tpm2_sessions_init
> calls from it since these will all be called in tpm2_auto_startup and
> tpm1_auto_startup.
>
> The exporting of the tpm2_session_init symbol was only necessary while the
> ibmvtpm driver was calling this function. Since this is not the case
> anymore, remove this symbol from being exported.
>
> What is new for the ibmvtpm driver is that now tpm2_do_selftest and
> tpm1_do_selftest will be called that send commands to the TPM to perform
> or continue its selftest. However, the firmware should already have sent
> these commands so that the TPM will not do much work at this time.
>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> ---
>  drivers/char/tpm/tpm2-sessions.c |  1 -
>  drivers/char/tpm/tpm_ibmvtpm.c   | 15 +--------------
>  2 files changed, 1 insertion(+), 15 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c
> index 511c67061728..b1a0a37f14d7 100644
> --- a/drivers/char/tpm/tpm2-sessions.c
> +++ b/drivers/char/tpm/tpm2-sessions.c
> @@ -1362,5 +1362,4 @@ int tpm2_sessions_init(struct tpm_chip *chip)
>  
>  	return rc;
>  }
> -EXPORT_SYMBOL(tpm2_sessions_init);
>  #endif /* CONFIG_TCG_TPM2_HMAC */
> diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
> index 1e5b107d1f3b..76d048f63d55 100644
> --- a/drivers/char/tpm/tpm_ibmvtpm.c
> +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> @@ -450,6 +450,7 @@ static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
>  }
>  
>  static const struct tpm_class_ops tpm_ibmvtpm = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
>  	.recv = tpm_ibmvtpm_recv,
>  	.send = tpm_ibmvtpm_send,
>  	.cancel = tpm_ibmvtpm_cancel,
> @@ -690,20 +691,6 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
>  	if (!strcmp(id->compat, "IBM,vtpm20"))
>  		chip->flags |= TPM_CHIP_FLAG_TPM2;
>  
> -	rc = tpm_get_timeouts(chip);
> -	if (rc)
> -		goto init_irq_cleanup;
> -
> -	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> -		rc = tpm2_get_cc_attrs_tbl(chip);
> -		if (rc)
> -			goto init_irq_cleanup;
> -
> -		rc = tpm2_sessions_init(chip);
> -		if (rc)
> -			goto init_irq_cleanup;
> -	}
> -
>  	return tpm_chip_register(chip);
>  init_irq_cleanup:
>  	do {

Not much to say about this ;-)

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko