path: root/drivers/char/tpm/tpm-chip.c
diff options
authorJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2017-03-24 11:45:49 +0200
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2017-04-03 22:46:02 +0300
commit877c57d0d0cac2c8fc661f708d8ee3fa7aa8d28b (patch)
tree36fcb0bf566df51a40ce092141394426800e02d0 /drivers/char/tpm/tpm-chip.c
parent84d25940678b7f93665d0964c9729680fa4a97e9 (diff)
tpm_crb: request and relinquish locality 0
This commit adds support for requesting and relinquishing locality 0 in tpm_crb for the course of command transmission. In order to achieve this, two new callbacks are added to struct tpm_class_ops: - request_locality - relinquish_locality With CRB interface you first set either requestAccess or relinquish bit from TPM_LOC_CTRL_x register and then wait for locAssigned and tpmRegValidSts bits to be set in the TPM_LOC_STATE_x register. The reason why were are doing this is to make sure that the driver will work properly with Intel TXT that uses locality 2. There's no explicit guarantee that it would relinquish this locality. In more general sense this commit enables tpm_crb to be a well behaving citizen in a multi locality environment. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Tested-by: Jerry Snitselaar <jsnitsel@redhat.com>
Diffstat (limited to 'drivers/char/tpm/tpm-chip.c')
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index aade6995f310..a321bd57f3e9 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -231,6 +231,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev,
goto out;
+ chip->locality = -1;
return chip;

Privacy Policy