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Commit a3fbfae8 authored by Jarkko Sakkinen's avatar Jarkko Sakkinen
Browse files

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



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: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: default avatarStefan Berger <stefanb@linux.ibm.com>
Tested-by: default avatarStefan Berger <stefanb@linux.ibm.com>
Reviewed-by: default avatarJerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: default avatarAlexander Steffen <Alexander.Steffen@infineon.com>
parent 719b7d81

drivers/char/tpm/tpm-chip.c

+22 −16
Original line number Diff line number Diff line
@@ -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);

		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)

	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;

drivers/char/tpm/tpm-interface.c

+9 −9
Original line number Diff line number Diff line
@@ -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)

	if (chip->flags & TPM_CHIP_FLAG_TPM2) {

		mutex_lock(&chip->tpm_mutex);

		if (!tpm_chip_start(chip, 0)) {

			tpm2_shutdown(chip, TPM2_SU_STATE);

	else

			tpm_chip_stop(chip, 0);

		}

		mutex_unlock(&chip->tpm_mutex);

	} else {

		rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);

	}



	return rc;

}

drivers/char/tpm/tpm.h

+0 −9
Original line number Diff line number Diff line
@@ -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,

drivers/char/tpm/tpm2-space.c

+4 −1
Original line number Diff line number Diff line
@@ -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);

	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);

drivers/char/tpm/tpm_tis_core.c

+4 −0
Original line number Diff line number Diff line
@@ -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;