linux-kernel - Re: [PATCH] tpm: migrate tpm2_do_selftest() to use struct tpm

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Message-ID: <20180215134104.2m2vd5dhz25kzspq@linux.intel.com>
Date:   Thu, 15 Feb 2018 15:41:04 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Nayna Jain <nayna@...ux.vnet.ibm.com>
Cc:     linux-integrity@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: migrate tpm2_do_selftest() to use struct tpm_buf

On Mon, Feb 12, 2018 at 02:31:43PM +0530, Nayna Jain wrote:
> 
> 
> On 02/09/2018 06:48 PM, Jarkko Sakkinen wrote:
> > As part of an ongoing effort to encapsulate TPM commands to struct
> > tpm_buf instead of using clunky union of structs, migrated
> > tpm2_do_selft_test() to use struct tpm_buf.
> > 
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > ---
> > I wish this would be included as part of patch set that fixes the timing
> > issue.
> >   drivers/char/tpm/tpm2-cmd.c | 32 ++++++++++----------------------
> >   1 file changed, 10 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> > index c17e75348a99..a91a2c6f03a7 100644
> > --- a/drivers/char/tpm/tpm2-cmd.c
> > +++ b/drivers/char/tpm/tpm2-cmd.c
> > @@ -31,10 +31,6 @@ struct tpm2_startup_in {
> >   	__be16	startup_type;
> >   } __packed;
> > 
> > -struct tpm2_self_test_in {
> > -	u8	full_test;
> > -} __packed;
> > -
> >   struct tpm2_get_tpm_pt_in {
> >   	__be32	cap_id;
> >   	__be32	property_id;
> > @@ -60,7 +56,6 @@ struct tpm2_get_random_out {
> > 
> >   union tpm2_cmd_params {
> >   	struct	tpm2_startup_in		startup_in;
> > -	struct	tpm2_self_test_in	selftest_in;
> >   	struct	tpm2_get_tpm_pt_in	get_tpm_pt_in;
> >   	struct	tpm2_get_tpm_pt_out	get_tpm_pt_out;
> >   	struct	tpm2_get_random_in	getrandom_in;
> > @@ -823,16 +818,6 @@ unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
> >   }
> >   EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
> > 
> > -#define TPM2_SELF_TEST_IN_SIZE \
> > -	(sizeof(struct tpm_input_header) + \
> > -	 sizeof(struct tpm2_self_test_in))
> > -
> > -static const struct tpm_input_header tpm2_selftest_header = {
> > -	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
> > -	.length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
> > -	.ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
> > -};
> > -
> >   /**
> >    * tpm2_do_selftest() - ensure that all self tests have passed
> >    *
> > @@ -851,18 +836,21 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
> >   	int rc;
> >   	unsigned int delay_msec = 10;
> >   	long duration;
> > -	struct tpm2_cmd cmd;
> > +	struct tpm_buf buf;
> > 
> >   	duration = jiffies_to_msecs(
> >   		tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST));
> > 
> > -	while (1) {
> > -		cmd.header.in = tpm2_selftest_header;
> > -		cmd.params.selftest_in.full_test = 0;
> > -
> > -		rc = tpm_transmit_cmd(chip, NULL, &cmd, TPM2_SELF_TEST_IN_SIZE,
> > -				      0, 0, "continue selftest");
> > +	for (;;) {
> > +		rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_SELF_TEST);
> > +		if (rc)
> > +			return rc;
> > 
> > +		/* Perform tests in the background. */
> > +		tpm_buf_append_u8(&buf, 0);
> > +		rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
> > +				      "continue selftest");
> > +		tpm_buf_destroy(&buf);
> >   		if (rc != TPM2_RC_TESTING || delay_msec >= duration)
> >   			break;
> > 
> Tested-By: Nayna Jain <nayna@...ux.vnet.ibm.com>

Thank you Nayna.

/Jarkko