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Message-Id: <dfb224e4-82b8-26c0-e69a-c72d19712d48@linux.ibm.com>
Date: Thu, 7 Feb 2019 18:32:17 -0500
From: Stefan Berger <stefanb@...ux.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
linux-integrity@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org,
Peter Huewe <PeterHuewe@....de>,
Jason Gunthorpe <jgg@...pe.ca>,
Tomas Winkler <tomas.winkler@...el.com>,
Tadeusz Struk <tadeusz.struk@...el.com>,
Stefan Berger <stefanb@...ux.vnet.ibm.com>,
Nayna Jain <nayna@...ux.ibm.com>
Subject: Re: [PATCH v11 15/16] tpm: take TPM chip power gating out of
tpm_transmit()
On 2/5/19 5:47 PM, Jarkko Sakkinen wrote:
> Call tpm_chip_start() and tpm_chip_stop() in
>
> * tpm_try_get_ops() and tpm_put_ops()
> * tpm_chip_register()
> * 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@...ux.intel.com>
> Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
> Tested-by: Stefan Berger <stefanb@...ux.ibm.com>
> Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>
> Reviewed-by: James Bottomley <James.Bottomley@...senPartnership.com>
> ---
> drivers/char/tpm/tpm-chip.c | 25 ++++++++++++-------------
> drivers/char/tpm/tpm-interface.c | 6 ------
> drivers/char/tpm/tpm.h | 9 ---------
> drivers/char/tpm/tpm2-space.c | 5 ++++-
> drivers/char/tpm/tpm_vtpm_proxy.c | 3 +--
> 5 files changed, 17 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index 65f1561eba81..7ad4d9045e4c 100644
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -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;
>
> @@ -166,11 +154,17 @@ 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;
> @@ -186,6 +180,7 @@ 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);
> @@ -563,7 +558,11 @@ 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;
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index f7b7e4e75fcf..f20c78055731 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -168,13 +168,7 @@ 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);
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 2d6d934f1c8b..53e4208759ee 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -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,
> diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> index 9c9ccf2c0681..6c6ad2d4d31b 100644
> --- a/drivers/char/tpm/tpm2-space.c
> +++ b/drivers/char/tpm/tpm2-space.c
> @@ -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);
> diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
> index e8a1da2810a9..a4bb60e163cc 100644
> --- a/drivers/char/tpm/tpm_vtpm_proxy.c
> +++ b/drivers/char/tpm/tpm_vtpm_proxy.c
> @@ -417,8 +417,7 @@ 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;
>
This patch seems to be missing a hunk along these lines here
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index e74c5b7b64bf..52afe20cc8a1 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -799,7 +799,9 @@ int tpm2_probe(struct tpm_chip *chip)
tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS);
tpm_buf_append_u32(&buf, 1);
+ tpm_chip_start(chip, 0);
rc = tpm_transmit_cmd(chip, &buf, 0, NULL);
+ tpm_chip_stop(chip, 0);
/* We ignore TPM return codes on purpose. */
if (rc >= 0) {
out = (struct tpm_header *)buf.data;
Of course you need to check the error from tpm_chip_start().
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