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Date: Wed, 5 Apr 2017 15:17:39 +0300
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: Jerry Snitselaar <jsnitsel@...hat.com>
Cc: tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
Peter Huewe <peterhuewe@....de>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
Marcel Selhorst <tpmdd@...horst.net>
Subject: Re: [PATCH v2] tpm_tis: convert to using locality callbacks
On Mon, Mar 27, 2017 at 08:46:04AM -0700, Jerry Snitselaar wrote:
> This patch converts tpm_tis to use of the new tpm class ops
> request_locality, and relinquish_locality.
>
> With the move to using the callbacks, release_locality is changed so
> that we now release the locality even if there is no request pending.
>
> This required some changes to the tpm_tis_core_init code path to
> make sure locality is requested when needed:
>
> - tpm2_probe code path will end up calling request/release through
> callbacks, so request_locality prior to tpm2_probe not needed.
>
> - probe_itpm makes calls to tpm_tis_send_data which no longer calls
> request_locality, so add request_locality prior to tpm_tis_send_data
> calls. Also drop release_locality call in middleof probe_itpm, and
> keep locality until release_locality called at end of probe_itpm.
>
> Cc: Peter Huewe <peterhuewe@....de>
> Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> Cc: Marcel Selhorst <tpmdd@...horst.net>
> Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
I'll give Reviewed-by for this and it's already in my master branch but
not yet in next because I haven't been able to test it yet. Tested-by's
are very welcome and testing should be easy to do as the change is
already pushed.
Thank you for doing this.
/Jarkko
> ---
> v2: drop release_locality call in tpm_tis_remove
>
> drivers/char/tpm/tpm_tis_core.c | 34 ++++++++--------------------------
> 1 file changed, 8 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index f31fc831c8f9..b617b2eeb080 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -75,21 +75,11 @@ static bool check_locality(struct tpm_chip *chip, int l)
> return false;
> }
>
> -static void release_locality(struct tpm_chip *chip, int l, int force)
> +static void release_locality(struct tpm_chip *chip, int l)
> {
> struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> - int rc;
> - u8 access;
> -
> - rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
> - if (rc < 0)
> - return;
> -
> - if (force || (access &
> - (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
> - (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
> - tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
>
> + tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
> }
>
> static int request_locality(struct tpm_chip *chip, int l)
> @@ -254,7 +244,6 @@ 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;
> }
>
> @@ -270,9 +259,6 @@ 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);
> @@ -331,7 +317,6 @@ 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;
> }
>
> @@ -392,7 +377,6 @@ 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;
> }
>
> @@ -479,12 +463,14 @@ static int probe_itpm(struct tpm_chip *chip)
> if (vendor != TPM_VID_INTEL)
> return 0;
>
> + if (request_locality(chip, 0) != 0)
> + return -EBUSY;
> +
> rc = tpm_tis_send_data(chip, cmd_getticks, len);
> if (rc == 0)
> goto out;
>
> tpm_tis_ready(chip);
> - release_locality(chip, priv->locality, 0);
>
> priv->flags |= TPM_TIS_ITPM_WORKAROUND;
>
> @@ -498,7 +484,7 @@ static int probe_itpm(struct tpm_chip *chip)
>
> out:
> tpm_tis_ready(chip);
> - release_locality(chip, priv->locality, 0);
> + release_locality(chip, priv->locality);
>
> return rc;
> }
> @@ -672,7 +658,6 @@ void tpm_tis_remove(struct tpm_chip *chip)
> interrupt = 0;
>
> tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt);
> - release_locality(chip, priv->locality, 1);
> }
> EXPORT_SYMBOL_GPL(tpm_tis_remove);
>
> @@ -686,6 +671,8 @@ static const struct tpm_class_ops tpm_tis = {
> .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,
> + .request_locality = request_locality,
> + .relinquish_locality = release_locality,
> };
>
> int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
> @@ -728,11 +715,6 @@ 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);
>
> - if (request_locality(chip, 0) != 0) {
> - rc = -ENODEV;
> - goto out_err;
> - }
> -
> rc = tpm2_probe(chip);
> if (rc)
> goto out_err;
> --
> 2.11.0.258.ge05806da9
>
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