Commit a3fbfae8 authored by Jarkko Sakkinen's avatar Jarkko Sakkinen

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
...@@ -41,9 +41,6 @@ static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags) ...@@ -41,9 +41,6 @@ static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags)
{ {
int rc; int rc;
if (flags & TPM_TRANSMIT_NESTED)
return 0;
if (!chip->ops->request_locality) if (!chip->ops->request_locality)
return 0; return 0;
...@@ -59,9 +56,6 @@ static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags) ...@@ -59,9 +56,6 @@ static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags)
{ {
int rc; int rc;
if (flags & TPM_TRANSMIT_NESTED)
return;
if (!chip->ops->relinquish_locality) if (!chip->ops->relinquish_locality)
return; return;
...@@ -74,9 +68,6 @@ static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags) ...@@ -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) static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags)
{ {
if (flags & TPM_TRANSMIT_NESTED)
return 0;
if (!chip->ops->cmd_ready) if (!chip->ops->cmd_ready)
return 0; return 0;
...@@ -85,9 +76,6 @@ static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags) ...@@ -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) static int tpm_go_idle(struct tpm_chip *chip, unsigned int flags)
{ {
if (flags & TPM_TRANSMIT_NESTED)
return 0;
if (!chip->ops->go_idle) if (!chip->ops->go_idle)
return 0; return 0;
...@@ -167,11 +155,17 @@ int tpm_try_get_ops(struct tpm_chip *chip) ...@@ -167,11 +155,17 @@ int tpm_try_get_ops(struct tpm_chip *chip)
down_read(&chip->ops_sem); down_read(&chip->ops_sem);
if (!chip->ops) if (!chip->ops)
goto out_lock; goto out_ops;
mutex_lock(&chip->tpm_mutex); mutex_lock(&chip->tpm_mutex);
rc = tpm_chip_start(chip, 0);
if (rc)
goto out_lock;
return 0; return 0;
out_lock: out_lock:
mutex_unlock(&chip->tpm_mutex);
out_ops:
up_read(&chip->ops_sem); up_read(&chip->ops_sem);
put_device(&chip->dev); put_device(&chip->dev);
return rc; return rc;
...@@ -187,6 +181,7 @@ EXPORT_SYMBOL_GPL(tpm_try_get_ops); ...@@ -187,6 +181,7 @@ EXPORT_SYMBOL_GPL(tpm_try_get_ops);
*/ */
void tpm_put_ops(struct tpm_chip *chip) void tpm_put_ops(struct tpm_chip *chip)
{ {
tpm_chip_stop(chip, 0);
mutex_unlock(&chip->tpm_mutex); mutex_unlock(&chip->tpm_mutex);
up_read(&chip->ops_sem); up_read(&chip->ops_sem);
put_device(&chip->dev); put_device(&chip->dev);
...@@ -302,7 +297,10 @@ static int tpm_class_shutdown(struct device *dev) ...@@ -302,7 +297,10 @@ static int tpm_class_shutdown(struct device *dev)
if (chip->flags & TPM_CHIP_FLAG_TPM2) { if (chip->flags & TPM_CHIP_FLAG_TPM2) {
down_write(&chip->ops_sem); 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; chip->ops = NULL;
up_write(&chip->ops_sem); up_write(&chip->ops_sem);
} }
...@@ -481,8 +479,12 @@ static void tpm_del_char_device(struct tpm_chip *chip) ...@@ -481,8 +479,12 @@ static void tpm_del_char_device(struct tpm_chip *chip)
/* Make the driver uncallable. */ /* Make the driver uncallable. */
down_write(&chip->ops_sem); down_write(&chip->ops_sem);
if (chip->flags & TPM_CHIP_FLAG_TPM2) if (chip->flags & TPM_CHIP_FLAG_TPM2) {
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; chip->ops = NULL;
up_write(&chip->ops_sem); up_write(&chip->ops_sem);
} }
...@@ -564,7 +566,11 @@ int tpm_chip_register(struct tpm_chip *chip) ...@@ -564,7 +566,11 @@ int tpm_chip_register(struct tpm_chip *chip)
{ {
int rc; int rc;
rc = tpm_chip_start(chip, 0);
if (rc)
return rc;
rc = tpm_auto_startup(chip); rc = tpm_auto_startup(chip);
tpm_chip_stop(chip, 0);
if (rc) if (rc)
return rc; return rc;
......
...@@ -177,13 +177,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz, ...@@ -177,13 +177,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
memcpy(save, buf, save_size); memcpy(save, buf, save_size);
for (;;) { for (;;) {
ret = tpm_chip_start(chip, flags);
if (ret)
return ret;
ret = tpm_try_transmit(chip, buf, bufsiz, flags); ret = tpm_try_transmit(chip, buf, bufsiz, flags);
tpm_chip_stop(chip, flags);
if (ret < 0) if (ret < 0)
break; break;
rc = be32_to_cpu(header->return_code); rc = be32_to_cpu(header->return_code);
...@@ -420,10 +414,16 @@ int tpm_pm_suspend(struct device *dev) ...@@ -420,10 +414,16 @@ int tpm_pm_suspend(struct device *dev)
if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED) if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
return 0; return 0;
if (chip->flags & TPM_CHIP_FLAG_TPM2) if (chip->flags & TPM_CHIP_FLAG_TPM2) {
tpm2_shutdown(chip, TPM2_SU_STATE); mutex_lock(&chip->tpm_mutex);
else 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); rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
}
return rc; return rc;
} }
......
...@@ -485,15 +485,6 @@ extern const struct file_operations tpm_fops; ...@@ -485,15 +485,6 @@ extern const struct file_operations tpm_fops;
extern const struct file_operations tpmrm_fops; extern const struct file_operations tpmrm_fops;
extern struct idr dev_nums_idr; 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, ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
unsigned int flags); unsigned int flags);
ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf, ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
......
...@@ -60,7 +60,10 @@ int tpm2_init_space(struct tpm_space *space) ...@@ -60,7 +60,10 @@ int tpm2_init_space(struct tpm_space *space)
void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space) void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space)
{ {
mutex_lock(&chip->tpm_mutex); 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); mutex_unlock(&chip->tpm_mutex);
kfree(space->context_buf); kfree(space->context_buf);
kfree(space->session_buf); kfree(space->session_buf);
......
...@@ -916,7 +916,11 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, ...@@ -916,7 +916,11 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
intmask &= ~TPM_GLOBAL_INT_ENABLE; intmask &= ~TPM_GLOBAL_INT_ENABLE;
tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); 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); rc = tpm2_probe(chip);
tpm_chip_stop(chip, 0);
if (rc) if (rc)
goto out_err; goto out_err;
......
...@@ -416,8 +416,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality) ...@@ -416,8 +416,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
proxy_dev->state |= STATE_DRIVER_COMMAND; proxy_dev->state |= STATE_DRIVER_COMMAND;
rc = tpm_transmit_cmd(chip, &buf, 0, TPM_TRANSMIT_NESTED, rc = tpm_transmit_cmd(chip, &buf, 0, 0, "attempting to set locality");
"attempting to set locality");
proxy_dev->state &= ~STATE_DRIVER_COMMAND; proxy_dev->state &= ~STATE_DRIVER_COMMAND;
......
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