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

Browse source 
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
repo.diff.show_diff_stats 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;

18
drivers/char/tpm/tpm-interface.c
View file

@ -177,13 +177,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
memcpy(save, buf, save_size);
for (;;) {
ret = tpm_chip_start(chip, flags);
if (ret)
return ret;
ret = tpm_try_transmit(chip, buf, bufsiz, flags);
tpm_chip_stop(chip, flags);
if (ret < 0)
break;
rc = be32_to_cpu(header->return_code);
@ -420,10 +414,16 @@ int tpm_pm_suspend(struct device *dev)
if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
return 0;
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_shutdown(chip, TPM2_SU_STATE);
else
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
mutex_lock(&chip->tpm_mutex);
if (!tpm_chip_start(chip, 0)) {
tpm2_shutdown(chip, TPM2_SU_STATE);
tpm_chip_stop(chip, 0);
}
mutex_unlock(&chip->tpm_mutex);
} else {
rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
}
return rc;
}

9
drivers/char/tpm/tpm.h
View file

@ -485,15 +485,6 @@ extern const struct file_operations tpm_fops;
extern const struct file_operations tpmrm_fops;
extern struct idr dev_nums_idr;
/**
* enum tpm_transmit_flags - flags for tpm_transmit()
*
* %TPM_TRANSMIT_NESTED: discard setup steps (power management, locality)
*/
enum tpm_transmit_flags {
TPM_TRANSMIT_NESTED = BIT(0),
};
ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
unsigned int flags);
ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,

5
drivers/char/tpm/tpm2-space.c
View file

@ -60,7 +60,10 @@ int tpm2_init_space(struct tpm_space *space)
void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space)
{
mutex_lock(&chip->tpm_mutex);
tpm2_flush_sessions(chip, space);
if (!tpm_chip_start(chip, 0)) {
tpm2_flush_sessions(chip, space);
tpm_chip_stop(chip, 0);
}
mutex_unlock(&chip->tpm_mutex);
kfree(space->context_buf);
kfree(space->session_buf);

4
drivers/char/tpm/tpm_tis_core.c
View file

@ -916,7 +916,11 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
intmask &= ~TPM_GLOBAL_INT_ENABLE;
tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
rc = tpm_chip_start(chip, 0);
if (rc)
goto out_err;
rc = tpm2_probe(chip);
tpm_chip_stop(chip, 0);
if (rc)
goto out_err;

3
drivers/char/tpm/tpm_vtpm_proxy.c
View file

@ -416,8 +416,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
proxy_dev->state |= STATE_DRIVER_COMMAND;
rc = tpm_transmit_cmd(chip, &buf, 0, TPM_TRANSMIT_NESTED,
"attempting to set locality");
rc = tpm_transmit_cmd(chip, &buf, 0, 0, "attempting to set locality");
proxy_dev->state &= ~STATE_DRIVER_COMMAND;