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Message-ID: <20170311105543.gkj46ktz6kup3bu5@intel.com>
Date: Sat, 11 Mar 2017 12:55:43 +0200
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: tpmdd-devel@...ts.sourceforge.net
Cc: linux-security-module@...r.kernel.org,
Jerry Snitselaar <jsnitsel@...hat.com>, gang.wei@...el.com,
Peter Huewe <peterhuewe@....de>,
Marcel Selhorst <tpmdd@...horst.net>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC,v2] tpm_crb: request and relinquish locality 0
On Sat, Mar 11, 2017 at 12:53:36PM +0200, Jarkko Sakkinen wrote:
> Added two new callbacks to struct tpm_class_ops:
>
> - request_locality
> - relinquish_locality
>
> These are called before sending and receiving data from the TPM.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---
> This not yet v2 of this patch. I'm checking that this is what needs to be done
> for tpm_tis_core before I go through testing etc. Thank you.
And apparently I did not amend tpm-interface.c change :( Anyway, I'm
merely sanity checking that I'm doing the right thing.
/Jarkko
> drivers/char/tpm/tpm-interface.c | 9 +++++++++
> drivers/char/tpm/tpm_crb.c | 41 +++++++++++++++++++++++++++++++++++++++-
> drivers/char/tpm/tpm_tis_core.c | 10 +++-------
> include/linux/tpm.h | 3 ++-
> 4 files changed, 54 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index e38c792..036843e 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -407,6 +407,12 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
> if (chip->dev.parent)
> pm_runtime_get_sync(chip->dev.parent);
>
> + if (chip->ops->request_locality) {
> + rc = chip->ops->request_locality(chip);
> + if (rc)
> + goto out;
> + }
> +
> rc = tpm2_prepare_space(chip, space, ordinal, buf);
> if (rc)
> goto out;
> @@ -466,6 +472,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
> rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
>
> out:
> + if (chip->ops->relinquish_locality)
> + chip->ops->relinquish_locality(chip);
> +
> if (chip->dev.parent)
> pm_runtime_put_sync(chip->dev.parent);
>
> diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
> index 3245618..15b22a0 100644
> --- a/drivers/char/tpm/tpm_crb.c
> +++ b/drivers/char/tpm/tpm_crb.c
> @@ -34,6 +34,15 @@ enum crb_defaults {
> CRB_ACPI_START_INDEX = 1,
> };
>
> +enum crb_loc_ctrl {
> + CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0),
> + CRB_LOC_CTRL_RELINQUISH = BIT(1),
> +};
> +
> +enum crb_loc_state {
> + CRB_LOC_STATE_LOC_ASSIGNED = BIT(1),
> +};
> +
> enum crb_ctrl_req {
> CRB_CTRL_REQ_CMD_READY = BIT(0),
> CRB_CTRL_REQ_GO_IDLE = BIT(1),
> @@ -172,6 +181,35 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
> return 0;
> }
>
> +static int crb_request_locality(struct tpm_chip *chip, int loc)
> +{
> + struct crb_priv *priv = dev_get_drvdata(&chip->dev);
> +
> + if (!priv->regs_h)
> + return 0;
> +
> + iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl);
> + if (!crb_wait_for_reg_32(&priv->regs_h->loc_state,
> + CRB_LOC_STATE_LOC_ASSIGNED, /* mask */
> + CRB_LOC_STATE_LOC_ASSIGNED, /* value */
> + TPM2_TIMEOUT_C)) {
> + dev_warn(&chip->dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
> + return -ETIME;
> + }
> +
> + return 0;
> +}
> +
> +static void crb_relinquish_locality(struct tpm_chip *chip, int loc, bool force)
> +{
> + struct crb_priv *priv = dev_get_drvdata(&chip->dev);
> +
> + if (!priv->regs_h)
> + return;
> +
> + iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
> +}
> +
> static u8 crb_status(struct tpm_chip *chip)
> {
> struct crb_priv *priv = dev_get_drvdata(&chip->dev);
> @@ -198,7 +236,6 @@ static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
>
> memcpy_fromio(buf, priv->rsp, 6);
> expected = be32_to_cpup((__be32 *) &buf[2]);
> -
> if (expected > count)
> return -EIO;
>
> @@ -279,6 +316,8 @@ static const struct tpm_class_ops tpm_crb = {
> .send = crb_send,
> .cancel = crb_cancel,
> .req_canceled = crb_req_canceled,
> + .request_locality = crb_request_locality,
> + .relinquish_locality = crb_relinquish_locality,
> .req_complete_mask = CRB_DRV_STS_COMPLETE,
> .req_complete_val = CRB_DRV_STS_COMPLETE,
> };
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index fc0e9a2..505e9c5 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -73,7 +73,7 @@ static int check_locality(struct tpm_chip *chip, int l)
> return -1;
> }
>
> -static void release_locality(struct tpm_chip *chip, int l, int force)
> +static void release_locality(struct tpm_chip *chip, int l, bool force)
> {
> struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> int rc;
> @@ -252,7 +252,6 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
>
> out:
> tpm_tis_ready(chip);
> - release_locality(chip, priv->locality, 0);
> return size;
> }
>
> @@ -268,9 +267,6 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
> size_t count = 0;
> bool itpm = priv->flags & TPM_TIS_ITPM_WORKAROUND;
>
> - if (request_locality(chip, 0) < 0)
> - return -EBUSY;
> -
> status = tpm_tis_status(chip);
> if ((status & TPM_STS_COMMAND_READY) == 0) {
> tpm_tis_ready(chip);
> @@ -329,7 +325,6 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
>
> out_err:
> tpm_tis_ready(chip);
> - release_locality(chip, priv->locality, 0);
> return rc;
> }
>
> @@ -390,7 +385,6 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
> return len;
> out_err:
> tpm_tis_ready(chip);
> - release_locality(chip, priv->locality, 0);
> return rc;
> }
>
> @@ -681,6 +675,8 @@ static const struct tpm_class_ops tpm_tis = {
> .send = tpm_tis_send,
> .cancel = tpm_tis_ready,
> .update_timeouts = tpm_tis_update_timeouts,
> + .request_locality = request_locality,
> + .relinquish_locality = release_locality,
> .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
> .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
> .req_canceled = tpm_tis_req_canceled,
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index da158f0..65e05f9 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -48,7 +48,8 @@ struct tpm_class_ops {
> u8 (*status) (struct tpm_chip *chip);
> bool (*update_timeouts)(struct tpm_chip *chip,
> unsigned long *timeout_cap);
> -
> + int (*request_locality)(struct tpm_chip *chip, int loc);
> + void (*relinquish_locality)(struct tpm_chip *chip, int loc, bool force);
> };
>
> #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
> --
> 2.9.3
>
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