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tpm: provide a way to override the chip returned durations

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Patch adds method ->update_durations to override returned
durations in case TPM chip misbehaves for TPM 1.2 drivers.

Cc: Peter Huewe <peterhuewe@gmx.de>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Signed-off-by: Alexey Klimov <aklimov@redhat.com>
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> (!update_durations path)
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Jerry Snitselaar 2019-09-02 07:27:34 -07:00 committed by Jarkko Sakkinen
parent f2f5820e3b
commit 15d0b22c01
2 changed files with 17 additions and 0 deletions
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15
drivers/char/tpm/tpm1-cmd.c
View File

@ -343,6 +343,7 @@ int tpm1_get_timeouts(struct tpm_chip *chip)
{
cap_t cap;
unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
unsigned long durations[3];
ssize_t rc;
rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
@ -427,6 +428,20 @@ int tpm1_get_timeouts(struct tpm_chip *chip)
usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */
/*
* Provide the ability for vendor overrides of duration values in case
* of misreporting.
*/
if (chip->ops->update_durations)
chip->ops->update_durations(chip, durations);
if (chip->duration_adjusted) {
dev_info(&chip->dev, HW_ERR "Adjusting reported durations.");
chip->duration[TPM_SHORT] = durations[0];
chip->duration[TPM_MEDIUM] = durations[1];
chip->duration[TPM_LONG] = durations[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.

2
include/linux/tpm.h
View File

@ -67,6 +67,8 @@ struct tpm_class_ops {
u8 (*status) (struct tpm_chip *chip);
void (*update_timeouts)(struct tpm_chip *chip,
unsigned long *timeout_cap);
void (*update_durations)(struct tpm_chip *chip,
unsigned long *duration_cap);
int (*go_idle)(struct tpm_chip *chip);
int (*cmd_ready)(struct tpm_chip *chip);
int (*request_locality)(struct tpm_chip *chip, int loc);