Re: [PATCH v9 16/19] tpm: Add ability to set the preferred locality the TPM chip uses

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On 6/4/24 1:27 PM, Jarkko Sakkinen wrote:
On Fri May 31, 2024 at 4:03 AM EEST, Ross Philipson wrote:
Curently the locality is hard coded to 0 but for DRTM support, access
is needed to localities 1 through 4.

Signed-off-by: Ross Philipson <ross.philipson@xxxxxxxxxx>
---
  drivers/char/tpm/tpm-chip.c      | 24 +++++++++++++++++++++++-
  drivers/char/tpm/tpm-interface.c | 15 +++++++++++++++
  drivers/char/tpm/tpm.h           |  1 +
  include/linux/tpm.h              |  4 ++++
  4 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 854546000c92..73eac54d61fb 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -44,7 +44,7 @@ static int tpm_request_locality(struct tpm_chip *chip)
  	if (!chip->ops->request_locality)
  		return 0;
- rc = chip->ops->request_locality(chip, 0);
+	rc = chip->ops->request_locality(chip, chip->pref_locality);
  	if (rc < 0)
  		return rc;
@@ -143,6 +143,27 @@ void tpm_chip_stop(struct tpm_chip *chip)
  }
  EXPORT_SYMBOL_GPL(tpm_chip_stop);
+/**
+ * tpm_chip_preferred_locality() - set the TPM chip preferred locality to open
+ * @chip:	a TPM chip to use
+ * @locality:   the preferred locality
+ *
+ * Return:
+ * * true      - Preferred locality set
+ * * false     - Invalid locality specified
+ */
+bool tpm_chip_preferred_locality(struct tpm_chip *chip, int locality)
+{
+	if (locality < 0 || locality >=TPM_MAX_LOCALITY)
+		return false;
+
+	mutex_lock(&chip->tpm_mutex);
+	chip->pref_locality = locality;
+	mutex_unlock(&chip->tpm_mutex);
+	return true;
+}
+EXPORT_SYMBOL_GPL(tpm_chip_preferred_locality);
+
  /**
   * tpm_try_get_ops() - Get a ref to the tpm_chip
   * @chip: Chip to ref
@@ -374,6 +395,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev,
  	}
chip->locality = -1;
+	chip->pref_locality = 0;
  	return chip;
out:
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 5da134f12c9a..35f14ccecf0e 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -274,6 +274,21 @@ int tpm_is_tpm2(struct tpm_chip *chip)
  }
  EXPORT_SYMBOL_GPL(tpm_is_tpm2);
+/**
+ * tpm_preferred_locality() - set the TPM chip preferred locality to open
+ * @chip:	a TPM chip to use
+ * @locality:   the preferred locality
+ *
+ * Return:
+ * * true      - Preferred locality set
+ * * false     - Invalid locality specified
+ */
+bool tpm_preferred_locality(struct tpm_chip *chip, int locality)
+{
+	return tpm_chip_preferred_locality(chip, locality);
+}
+EXPORT_SYMBOL_GPL(tpm_preferred_locality);

  What good does this extra wrapping do?

  tpm_set_default_locality() and default_locality would make so much more
  sense in any case.

Are you mainly just talking about my naming choices here and in the follow-on response? Can you clarify what you are requesting?

Thanks
Ross


  BR, Jarkko


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