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tpm: take TPM chip power gating out of tpm_transmit()

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Call tpm_chip_start() and tpm_chip_stop() in

* tpm_chip_register()
* tpm_class_shutdown()
* tpm_del_char_device()
* tpm_pm_suspend()
* tpm_try_get_ops() and tpm_put_ops()
* tpm2_del_space()

And remove these calls from tpm_transmit(). The core reason for this
change is that in tpm_vtpm_proxy a locality change requires a virtual
TPM command (a command made up just for that driver).

The consequence of this is that this commit removes the remaining nested
calls.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Alexander Steffen <Alexander.Steffen@infineon.com>
This commit is contained in:
Jarkko Sakkinen
2018-11-05 02:07:56 +02:00
parent 719b7d81f2
commit a3fbfae82b
6 changed files with 40 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/char/tpm/tpm-chip.c
View File

@@ -41,9 +41,6 @@ static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags)
{
int rc;
if (flags & TPM_TRANSMIT_NESTED)
return 0;
if (!chip->ops->request_locality)
return 0;
@@ -59,9 +56,6 @@ static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags)
{
int rc;
if (flags & TPM_TRANSMIT_NESTED)
return;
if (!chip->ops->relinquish_locality)
return;
@@ -74,9 +68,6 @@ static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags)
static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags)
{
if (flags & TPM_TRANSMIT_NESTED)
return 0;
if (!chip->ops->cmd_ready)
return 0;
@@ -85,9 +76,6 @@ static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags)
static int tpm_go_idle(struct tpm_chip *chip, unsigned int flags)
{
if (flags & TPM_TRANSMIT_NESTED)
return 0;
if (!chip->ops->go_idle)
return 0;
@@ -167,11 +155,17 @@ int tpm_try_get_ops(struct tpm_chip *chip)
down_read(&chip->ops_sem);
if (!chip->ops)
goto out_lock;
goto out_ops;
mutex_lock(&chip->tpm_mutex);
rc = tpm_chip_start(chip, 0);
if (rc)
goto out_lock;
return 0;
out_lock:
mutex_unlock(&chip->tpm_mutex);
out_ops:
up_read(&chip->ops_sem);
put_device(&chip->dev);
return rc;
@@ -187,6 +181,7 @@ EXPORT_SYMBOL_GPL(tpm_try_get_ops);
*/
void tpm_put_ops(struct tpm_chip *chip)
{
tpm_chip_stop(chip, 0);
mutex_unlock(&chip->tpm_mutex);
up_read(&chip->ops_sem);
put_device(&chip->dev);
@@ -302,7 +297,10 @@ static int tpm_class_shutdown(struct device *dev)
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
down_write(&chip->ops_sem);
tpm2_shutdown(chip, TPM2_SU_CLEAR);
if (!tpm_chip_start(chip, 0)) {
tpm2_shutdown(chip, TPM2_SU_CLEAR);
tpm_chip_stop(chip, 0);
}
chip->ops = NULL;
up_write(&chip->ops_sem);
}
@@ -481,8 +479,12 @@ static void tpm_del_char_device(struct tpm_chip *chip)
/* Make the driver uncallable. */
down_write(&chip->ops_sem);
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_shutdown(chip, TPM2_SU_CLEAR);
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
if (!tpm_chip_start(chip, 0)) {
tpm2_shutdown(chip, TPM2_SU_CLEAR);
tpm_chip_stop(chip, 0);
}
}
chip->ops = NULL;
up_write(&chip->ops_sem);
}
@@ -564,7 +566,11 @@ int tpm_chip_register(struct tpm_chip *chip)
{
int rc;
rc = tpm_chip_start(chip, 0);
if (rc)
return rc;
rc = tpm_auto_startup(chip);
tpm_chip_stop(chip, 0);
if (rc)
return rc;