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Message-ID: <20160621205240.GB8218@intel.com>
Date: Tue, 21 Jun 2016 23:52:40 +0300
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: Ed Swierk <eswierk@...portsystems.com>
Cc: tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org,
jgunthorpe@...idianresearch.com, stefanb@...ibm.com
Subject: Re: [PATCH v7 3/5] tpm: Clean up reading of timeout and duration
capabilities
On Mon, Jun 20, 2016 at 06:54:00PM -0700, Ed Swierk wrote:
> Call tpm_getcap() from tpm_get_timeouts() to eliminate redundant
> code. Return all errors to the caller rather than swallowing them
> (e.g. when tpm_transmit_cmd() returns nonzero).
>
> Signed-off-by: Ed Swierk <eswierk@...portsystems.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
/Jarkko
> ---
> drivers/char/tpm/tpm-interface.c | 74 +++++++++++++++-------------------------
> 1 file changed, 27 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index cc1e5bc..73c3ee0 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -461,9 +461,19 @@ ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
> tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> tpm_cmd.params.getcap_in.subcap = subcap_id;
> }
> +
> rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
> +
> + if (!rc &&
> + ((subcap_id == TPM_CAP_PROP_TIS_TIMEOUT &&
> + be32_to_cpu(tpm_cmd.header.out.length) != TPM_HEADER_SIZE + 5) ||
> + (subcap_id == TPM_CAP_PROP_TIS_DURATION &&
> + be32_to_cpu(tpm_cmd.header.out.length) != TPM_HEADER_SIZE + 4)))
> + rc = -EINVAL;
> +
> if (!rc)
> *cap = tpm_cmd.params.getcap_out.cap;
> +
> return rc;
> }
>
> @@ -504,48 +514,30 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
>
> int tpm_get_timeouts(struct tpm_chip *chip)
> {
> - struct tpm_cmd_t tpm_cmd;
> + cap_t cap;
> unsigned long new_timeout[4];
> unsigned long old_timeout[4];
> - struct duration_t *duration_cap;
> ssize_t rc;
>
> - tpm_cmd.header.in = tpm_getcap_header;
> - tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
> - tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> - tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
> - rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
> -
> + rc = tpm_getcap(chip->pdev, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> + "attempting to determine the timeouts");
> if (rc == TPM_ERR_INVALID_POSTINIT) {
> /* The TPM is not started, we are the first to talk to it.
> Execute a startup command. */
> - dev_info(chip->pdev, "Issuing TPM_STARTUP");
> + dev_info(chip->pdev, "Issuing TPM_STARTUP\n");
> if (tpm_startup(chip, TPM_ST_CLEAR))
> return rc;
>
> - tpm_cmd.header.in = tpm_getcap_header;
> - tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
> - tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> - tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
> - rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> - NULL);
> - }
> - if (rc) {
> - dev_err(chip->pdev,
> - "A TPM error (%zd) occurred attempting to determine the timeouts\n",
> - rc);
> - goto duration;
> + rc = tpm_getcap(chip->pdev, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> + "attempting to determine the timeouts");
> }
> + if (rc)
> + return rc;
>
> - if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
> - be32_to_cpu(tpm_cmd.header.out.length)
> - != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
> - return -EINVAL;
> -
> - old_timeout[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a);
> - old_timeout[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b);
> - old_timeout[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c);
> - old_timeout[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d);
> + old_timeout[0] = be32_to_cpu(cap.timeout.a);
> + old_timeout[1] = be32_to_cpu(cap.timeout.b);
> + old_timeout[2] = be32_to_cpu(cap.timeout.c);
> + old_timeout[3] = be32_to_cpu(cap.timeout.d);
> memcpy(new_timeout, old_timeout, sizeof(new_timeout));
>
> /*
> @@ -583,29 +575,17 @@ int tpm_get_timeouts(struct tpm_chip *chip)
> chip->vendor.timeout_c = usecs_to_jiffies(new_timeout[2]);
> chip->vendor.timeout_d = usecs_to_jiffies(new_timeout[3]);
>
> -duration:
> - tpm_cmd.header.in = tpm_getcap_header;
> - tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
> - tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> - tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
> -
> - rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> - "attempting to determine the durations");
> + rc = tpm_getcap(chip->pdev, TPM_CAP_PROP_TIS_DURATION, &cap,
> + "attempting to determine the durations");
> if (rc)
> return rc;
>
> - if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
> - be32_to_cpu(tpm_cmd.header.out.length)
> - != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
> - return -EINVAL;
> -
> - duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
> chip->vendor.duration[TPM_SHORT] =
> - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
> + usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));
> chip->vendor.duration[TPM_MEDIUM] =
> - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
> + usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
> chip->vendor.duration[TPM_LONG] =
> - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
> + usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
>
> /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
> * value wrong and apparently reports msecs rather than usecs. So we
> --
> 1.9.1
>
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