linux-kernel - Re: [tpmdd-devel] [PATCH v8 6/8] tpm: TPM 2.0 baseline support

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Date:	Tue, 02 Dec 2014 21:28:35 -0500
From:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Peter Huewe <peterhuewe@....de>,
	Ashley Lai <ashley@...leylai.com>,
	Marcel Selhorst <tpmdd@...horst.net>
CC:	christophe.ricard@...il.com, josh.triplett@...el.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	Will Arthur <will.c.arthur@...el.com>,
	tpmdd-devel@...ts.sourceforge.net,
	jason.gunthorpe@...idianresearch.com,
	trousers-tech@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [PATCH v8 6/8] tpm: TPM 2.0 baseline support

On 12/02/2014 05:31 PM, Jarkko Sakkinen wrote:


> +
> +/**
> + * tpm2_startup() - send startup command to the TPM chip
> + * @chip:		TPM chip to use.
> + * @startup_type	startup type. The value is either
> + *			TPM_SU_CLEAR or TPM_SU_STATE.
> + *
> + * 0 is returned when the operation is successful. If a negative number is
> + * returned it remarks a POSIX error code. If a positive number is returned
> + * it remarks a TPM error.
> + */
> +int tpm2_startup(struct tpm_chip *chip, __be16 startup_type)
> +{
> +	struct tpm2_cmd cmd;
> +
> +	cmd.header.in = tpm2_startup_header;
> +
> +	cmd.params.startup_in.startup_type = startup_type;
> +	return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
> +				"attempting to start the TPM");
> +}

I suppose you need to send this command because your firmware does not 
do it ?Following TPM1.2 I guess the BIOS / UEFI should send this instead 
and sending it later would actually be wrong. Hm, I don't find from 
where you are calling this... do you need it ? Can you remove it?

    Stefan


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