linux-kernel - [PATCH 3/3] tpm: ibmvtpm: Add support for TPM 2

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Message-Id: <20200204132706.3220416-4-stefanb@linux.vnet.ibm.com>
Date:   Tue,  4 Feb 2020 08:27:06 -0500
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     linux-integrity@...r.kernel.org
Cc:     aik@...abs.ru, david@...son.dropbear.id.au,
        linux-kernel@...r.kernel.org, nayna@...ux.vnet.ibm.com,
        gcwilson@...ux.ibm.com, Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH 3/3] tpm: ibmvtpm: Add support for TPM 2

From: Stefan Berger <stefanb@...ux.ibm.com>

Support TPM 2 in the IBM vTPM driver. The hypervisor tells us what
version of TPM is connected through the vio_device_id.

In case a TPM 2 is found, we set the TPM_OPS_AUTO_STARTUP flag to
have properly initialize the TPM and driver.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
---
 drivers/char/tpm/tpm_ibmvtpm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index eee566eddb35..d479d64a65aa 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -29,6 +29,7 @@ static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
 
 static const struct vio_device_id tpm_ibmvtpm_device_table[] = {
 	{ "IBM,vtpm", "IBM,vtpm"},
+	{ "IBM,vtpm", "IBM,vtpm20"},
 	{ "", "" }
 };
 MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
@@ -443,7 +444,7 @@ static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
 	return (status == 0);
 }
 
-static const struct tpm_class_ops tpm_ibmvtpm = {
+static struct tpm_class_ops tpm_ibmvtpm = {
 	.recv = tpm_ibmvtpm_recv,
 	.send = tpm_ibmvtpm_send,
 	.cancel = tpm_ibmvtpm_cancel,
@@ -672,6 +673,11 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 	if (rc)
 		goto init_irq_cleanup;
 
+	if (!strcmp(id->compat, "IBM,vtpm20")) {
+		chip->flags |= TPM_CHIP_FLAG_TPM2;
+		tpm_ibmvtpm.flags = TPM_OPS_AUTO_STARTUP;
+	}
+
 	if (!wait_event_timeout(ibmvtpm->crq_queue.wq,
 				ibmvtpm->rtce_buf != NULL,
 				HZ)) {
-- 
2.23.0