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tpm: factor out tpm_get_timeouts()

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Factor out tpm_get_timeouts() into tpm2_get_timeouts()
and tpm1_get_timeouts()

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Tomas Winkler
2018-10-19 21:22:52 +03:00
committed by Jarkko Sakkinen
parent d856c00f7d
commit 70a3199a71
4 changed files with 135 additions and 123 deletions
Download Patch File Download Diff File Expand all files Collapse all files

106
drivers/char/tpm/tpm1-cmd.c
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@@ -307,3 +307,109 @@ unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
else
return duration;
}
int tpm1_get_timeouts(struct tpm_chip *chip)
{
cap_t cap;
unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
ssize_t rc;
rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
sizeof(cap.timeout));
if (rc == TPM_ERR_INVALID_POSTINIT) {
if (tpm_startup(chip))
return rc;
rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
"attempting to determine the timeouts",
sizeof(cap.timeout));
}
if (rc) {
dev_err(&chip->dev, "A TPM error (%zd) occurred attempting to determine the timeouts\n",
rc);
return rc;
}
timeout_old[0] = jiffies_to_usecs(chip->timeout_a);
timeout_old[1] = jiffies_to_usecs(chip->timeout_b);
timeout_old[2] = jiffies_to_usecs(chip->timeout_c);
timeout_old[3] = jiffies_to_usecs(chip->timeout_d);
timeout_chip[0] = be32_to_cpu(cap.timeout.a);
timeout_chip[1] = be32_to_cpu(cap.timeout.b);
timeout_chip[2] = be32_to_cpu(cap.timeout.c);
timeout_chip[3] = be32_to_cpu(cap.timeout.d);
memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff));
/*
* Provide ability for vendor overrides of timeout values in case
* of misreporting.
*/
if (chip->ops->update_timeouts)
chip->timeout_adjusted =
chip->ops->update_timeouts(chip, timeout_eff);
if (!chip->timeout_adjusted) {
/* Restore default if chip reported 0 */
unsigned int i;
for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) {
if (timeout_eff[i])
continue;
timeout_eff[i] = timeout_old[i];
chip->timeout_adjusted = true;
}
if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) {
/* timeouts in msec rather usec */
for (i = 0; i != ARRAY_SIZE(timeout_eff); i++)
timeout_eff[i] *= 1000;
chip->timeout_adjusted = true;
}
}
/* Report adjusted timeouts */
if (chip->timeout_adjusted) {
dev_info(&chip->dev, HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
timeout_chip[0], timeout_eff[0],
timeout_chip[1], timeout_eff[1],
timeout_chip[2], timeout_eff[2],
timeout_chip[3], timeout_eff[3]);
}
chip->timeout_a = usecs_to_jiffies(timeout_eff[0]);
chip->timeout_b = usecs_to_jiffies(timeout_eff[1]);
chip->timeout_c = usecs_to_jiffies(timeout_eff[2]);
chip->timeout_d = usecs_to_jiffies(timeout_eff[3]);
rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
"attempting to determine the durations",
sizeof(cap.duration));
if (rc)
return rc;
chip->duration[TPM_SHORT] =
usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));
chip->duration[TPM_MEDIUM] =
usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
chip->duration[TPM_LONG] =
usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */
/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
* value wrong and apparently reports msecs rather than usecs. So we
* fix up the resulting too-small TPM_SHORT value to make things work.
* We also scale the TPM_MEDIUM and -_LONG values by 1000.
*/
if (chip->duration[TPM_SHORT] < (HZ / 100)) {
chip->duration[TPM_SHORT] = HZ;
chip->duration[TPM_MEDIUM] *= 1000;
chip->duration[TPM_LONG] *= 1000;
chip->duration_adjusted = true;
dev_info(&chip->dev, "Adjusting TPM timeout parameters.");
}
chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
return 0;
}