@@ -688,4 +688,23 @@ u32 tpm2_report_state(struct udevice *dev, uint vendor_cmd, uint vendor_subcmd,
u32 tpm2_enable_nvcommits(struct udevice *dev, uint vendor_cmd,
uint vendor_subcmd);
+/**
+ * tpm2_auto_start() - start up the TPM and perform selftests.
+ * If a testable function has not been tested and is
+ * requested the TPM2 will return TPM_RC_NEEDS_TEST.
+ *
+ *
+ *
+ * @param dev TPM device
+ * Return: TPM_RC_TESTING, if TPM2 self-test has been received and the tests are
+ * not complete.
+ * TPM_RC_SUCCESS, if testing of all functions is complete without
+ * functional failures.
+ * TPM2_RC_FAILURE, if any test failed.
+ * TPM2_RC_INITIALIZE, if the TPM has not gone through the Startup
+ * sequence
+
+ */
+u32 tpm2_auto_start(struct udevice *dev);
+
#endif /* __TPM_V2_H */
@@ -331,4 +331,12 @@ static inline bool tpm_is_v2(struct udevice *dev)
return IS_ENABLED(CONFIG_TPM_V2) && tpm_get_version(dev) == TPM_V2;
}
+/**
+ * tpm_auto_start() - start up the TPM and perform selftests
+ *
+ * @param dev TPM device
+ * Return: return code of the operation (0 = success)
+ */
+u32 tpm_auto_start(struct udevice *dev);
+
#endif /* __TPM_API_H */
@@ -44,6 +44,23 @@ u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test)
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
+u32 tpm2_auto_start(struct udevice *dev)
+{
+ u32 rc;
+
+ rc = tpm2_self_test(dev, TPMI_YES);
+
+ if (rc == TPM2_RC_INITIALIZE) {
+ rc = tpm2_startup(dev, TPM2_SU_CLEAR);
+ if (rc)
+ return rc;
+
+ rc = tpm2_self_test(dev, TPMI_YES);
+ }
+
+ return rc;
+}
+
u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
const ssize_t pw_sz)
{
@@ -35,6 +35,14 @@ u32 tpm_startup(struct udevice *dev, enum tpm_startup_type mode)
}
}
+u32 tpm_auto_start(struct udevice *dev)
+{
+ if (tpm_is_v2(dev))
+ return tpm2_auto_start(dev);
+
+ return -ENOSYS;
+}
+
u32 tpm_resume(struct udevice *dev)
{
if (tpm_is_v1(dev))
As described in [0] if a command requires use of an untested algorithm or functional module, the TPM performs the test and then completes the command actions. Since we don't check for TPM_RC_NEEDS_TEST (which is the return code of the TPM in that case) and even if we would, it would complicate our TPM code for no apparent reason, add a wrapper function that performs both the selftest and the startup sequence of the TPM. It's worth noting that this is implemented on TPMv2.0. The code for 1.2 would look similar, but I don't have a device available to test. [0] https://trustedcomputinggroup.org/wp-content/uploads/TPM-Rev-2.0-Part-1-Architecture-01.07-2014-03-13.pdf ยง12.3 Self-test modes Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> --- Changes since v1: - Remove a superfluous if statement - Move function comments to the header file include/tpm-v2.h | 19 +++++++++++++++++++ include/tpm_api.h | 8 ++++++++ lib/tpm-v2.c | 17 +++++++++++++++++ lib/tpm_api.c | 8 ++++++++ 4 files changed, 52 insertions(+) -- 2.38.1