From: Stefan Berger <stefanb@linux.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Tomas Winkler <tomas.winkler@intel.com>,
Tadeusz Struk <tadeusz.struk@intel.com>,
Stefan Berger <stefanb@linux.vnet.ibm.com>,
Nayna Jain <nayna@linux.ibm.com>, Peter Huewe <peterhuewe@gmx.de>,
Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v9 16/17] tpm: take TPM chip power gating out of tpm_transmit()
Date: Mon, 19 Nov 2018 09:15:34 -0500 [thread overview]
Message-ID: <a9a012db-4e1c-2417-6770-229f441a48eb@linux.ibm.com> (raw)
In-Reply-To: <20181118124753.18613-17-jarkko.sakkinen@linux.intel.com>
On 11/18/18 7:47 AM, 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@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> ---
> drivers/char/tpm/tpm-chip.c | 25 ++++++++++++-------------
> drivers/char/tpm/tpm-interface.c | 4 ----
> 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(+), 29 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 2c79284ffd4e..21ac8da94d90 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -168,11 +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 c42a75710b70..f9d56dfd0d20 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 ced1dc91ba6f..d913715d30aa 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;
>
next prev parent reply other threads:[~2018-11-19 14:15 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-18 12:47 [PATCH v9 00/17] Removed nested TPM operations Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 01/17] tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 02/17] tpm: fix invalid return value in pubek_show() Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 03/17] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 04/17] tpm: print tpm2_commit_space() error inside tpm2_commit_space() Jarkko Sakkinen
2018-11-19 21:25 ` Winkler, Tomas
2018-11-20 12:49 ` Jarkko Sakkinen
2018-11-20 13:12 ` Winkler, Tomas
2018-11-18 12:47 ` [PATCH v9 05/17] tpm: declare struct tpm_header Jarkko Sakkinen
2018-11-19 21:33 ` Winkler, Tomas
2018-11-20 13:08 ` Jarkko Sakkinen
2018-11-20 16:01 ` Jason Gunthorpe
2018-11-20 22:50 ` Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 06/17] tpm: access command header through struct in tpm_try_transmit() Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 07/17] tpm: encapsulate tpm_dev_transmit() Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 08/17] tpm: call tpm2_flush_space() on error in tpm_try_transmit() Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 09/17] tpm: clean up tpm_try_transmit() error handling flow Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 10/17] tpm: move tpm_validate_commmand() to tpm2-space.c Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 11/17] tpm: move TPM space code out of tpm_transmit() Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 12/17] tpm: remove @space from tpm_transmit() Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 13/17] tpm: use tpm_try_get_ops() in tpm-sysfs.c Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 14/17] tpm: remove TPM_TRANSMIT_UNLOCKED flag Jarkko Sakkinen
2018-11-18 19:51 ` Jason Gunthorpe
2018-11-19 12:38 ` Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 15/17] tpm: introduce tpm_chip_start() and tpm_chip_stop() Jarkko Sakkinen
2018-11-19 14:13 ` Stefan Berger
2018-11-19 15:50 ` Jarkko Sakkinen
2018-11-18 12:47 ` [PATCH v9 16/17] tpm: take TPM chip power gating out of tpm_transmit() Jarkko Sakkinen
2018-11-18 22:52 ` Winkler, Tomas
2018-11-19 12:48 ` Jarkko Sakkinen
2018-11-19 13:17 ` Winkler, Tomas
2018-11-19 15:55 ` Jarkko Sakkinen
2018-11-19 14:15 ` Stefan Berger [this message]
2018-11-18 12:47 ` [PATCH v9 17/17] tpm: remove @flags from tpm_transmit() Jarkko Sakkinen
2018-11-19 14:23 ` [PATCH v9 00/17] Removed nested TPM operations Stefan Berger
2018-11-19 15:56 ` Jarkko Sakkinen
2018-11-27 23:41 ` Jarkko Sakkinen
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