linux-kernel - [PATCH] tpm: ibmvtpm: Set TPM_OPS_AUTO

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Message-ID: <20241014141643.3101129-1-stefanb@linux.ibm.com>
Date: Mon, 14 Oct 2024 10:16:43 -0400
From: Stefan Berger <stefanb@...ux.ibm.com>
To: linux-integrity@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        jarkko@...nel.org
Cc: linux-kernel@...r.kernel.org, Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH] tpm: ibmvtpm: Set TPM_OPS_AUTO_STARTUP flag on driver

Set the TPM_OPS_AUTO_STARTUP on the driver so that the ibmvtpm driver now
uses tpm2_auto_startup and tpm1_auto_startup like many other drivers do.
Remove tpm_get_timeouts, tpm2_get_cc_attrs_tbl, and tpm2_sessions_init
calls from it since these will all be called in tpm2_auto_startup and
tpm1_auto_startup.

The exporting of the tpm2_session_init symbol was only necessary while the
ibmvtpm driver was calling this function. Since this is not the case
anymore, remove this symbol from being exported.

What is new for the ibmvtpm driver is that now tpm2_do_selftest and
tpm1_do_selftest will be called that send commands to the TPM to perform
or continue its selftest. However, the firmware should already have sent
these commands so that the TPM will not do much work at this time.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
---
 drivers/char/tpm/tpm2-sessions.c |  1 -
 drivers/char/tpm/tpm_ibmvtpm.c   | 15 +--------------
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c
index 511c67061728..b1a0a37f14d7 100644
--- a/drivers/char/tpm/tpm2-sessions.c
+++ b/drivers/char/tpm/tpm2-sessions.c
@@ -1362,5 +1362,4 @@ int tpm2_sessions_init(struct tpm_chip *chip)
 
 	return rc;
 }
-EXPORT_SYMBOL(tpm2_sessions_init);
 #endif /* CONFIG_TCG_TPM2_HMAC */
diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index 1e5b107d1f3b..76d048f63d55 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -450,6 +450,7 @@ static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
 }
 
 static const struct tpm_class_ops tpm_ibmvtpm = {
+	.flags = TPM_OPS_AUTO_STARTUP,
 	.recv = tpm_ibmvtpm_recv,
 	.send = tpm_ibmvtpm_send,
 	.cancel = tpm_ibmvtpm_cancel,
@@ -690,20 +691,6 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 	if (!strcmp(id->compat, "IBM,vtpm20"))
 		chip->flags |= TPM_CHIP_FLAG_TPM2;
 
-	rc = tpm_get_timeouts(chip);
-	if (rc)
-		goto init_irq_cleanup;
-
-	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
-		rc = tpm2_get_cc_attrs_tbl(chip);
-		if (rc)
-			goto init_irq_cleanup;
-
-		rc = tpm2_sessions_init(chip);
-		if (rc)
-			goto init_irq_cleanup;
-	}
-
 	return tpm_chip_register(chip);
 init_irq_cleanup:
 	do {
-- 
2.43.0