On 6/4/24 16:14, Jarkko Sakkinen wrote:
On Fri May 31, 2024 at 4:03 AM EEST, Ross Philipson wrote:
From: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
When tis core initializes, it assumes all localities are closed. There
s/tis_core/tpm_tis_core/
Ack.
are cases when this may not be the case. This commit addresses this by
ensuring all localities are closed before initializing begins.
Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ross Philipson <ross.philipson@xxxxxxxxxx>
---
drivers/char/tpm/tpm_tis_core.c | 11 ++++++++++-
include/linux/tpm.h | 6 ++++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 7c1761bd6000..9fb53bb3e73f 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1104,7 +1104,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
u32 intmask;
u32 clkrun_val;
u8 rid;
- int rc, probe;
+ int rc, probe, i;
struct tpm_chip *chip;
chip = tpmm_chip_alloc(dev, &tpm_tis);
@@ -1166,6 +1166,15 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
goto out_err;
}
+ /*
+ * There are environments, like Intel TXT, that may leave a TPM
What else at this point than Intel TXT reflecting the state of the
mainline?
Leaving the TPM in Locality 2 is a requirement of the TCG D-RTM
specification. This will be the situation for AMD and Arm as well. The
comment can be updated to ref the TCG spec instead of a specific
implementation.
+ * locality open. Close all localities to start from a known state.
+ */
+ for (i = 0; i <= TPM_MAX_LOCALITY; i++) {
+ if (check_locality(chip, i))
+ tpm_tis_relinquish_locality(chip, i);
+ }
To be strict this should be enabled only for x86 platforms.
I.e. should be flagged.
As mentioned above, this will also affect Arm.
+
/* Take control of the TPM's interrupt hardware and shut it off */
rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
if (rc < 0)
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index c17e4efbb2e5..363f7078c3a9 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -147,6 +147,12 @@ struct tpm_chip_seqops {
*/
#define TPM2_MAX_CONTEXT_SIZE 4096
+/*
+ * The maximum locality (0 - 4) for a TPM, as defined in section 3.2 of the
+ * Client Platform Profile Specification.
+ */
+#define TPM_MAX_LOCALITY 4
+
struct tpm_chip {
struct device dev;
struct device devs;
BR, Jarkko
v/r,
dps
