linux-kernel - [PATCH] tpm: Make chip->{status,cancel,req

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Message-Id: <20250326161838.123606-1-jarkko@kernel.org>
Date: Wed, 26 Mar 2025 18:18:38 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: Sumit Garg <sumit.garg@...nel.org>,
	Stefano Garzarella <sgarzare@...hat.com>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>,
	Peter Huewe <peterhuewe@....de>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] tpm: Make chip->{status,cancel,req_canceled} opt

From: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>

tpm_ftpm_tee does not require chip->status, chip->cancel and
chip->req_canceled. Make them optional.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>
---
 drivers/char/tpm/tpm-interface.c | 31 ++++++++++++++++++++++++++++---
 drivers/char/tpm/tpm_ftpm_tee.c  | 20 --------------------
 2 files changed, 28 insertions(+), 23 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index f62f7871edbd..10ba47a882d8 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -58,6 +58,30 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
 }
 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 
+static void tpm_chip_cancel(struct tpm_chip *chip)
+{
+	if (!chip->ops->cancel)
+		return;
+
+	chip->ops->cancel(chip);
+}
+
+static u8 tpm_chip_status(struct tpm_chip *chip)
+{
+	if (!chip->ops->status)
+		return 0;
+
+	return chip->ops->status(chip);
+}
+
+static bool tpm_chip_req_canceled(struct tpm_chip *chip, u8 status)
+{
+	if (!chip->ops->req_canceled)
+		return false;
+
+	return chip->ops->req_canceled(chip, status);
+}
+
 static ssize_t tpm_try_transmit(struct tpm_chip *chip, void *buf, size_t bufsiz)
 {
 	struct tpm_header *header = buf;
@@ -65,6 +89,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, void *buf, size_t bufsiz)
 	ssize_t len = 0;
 	u32 count, ordinal;
 	unsigned long stop;
+	u8 status;
 
 	if (bufsiz < TPM_HEADER_SIZE)
 		return -EINVAL;
@@ -104,12 +129,12 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, void *buf, size_t bufsiz)
 
 	stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 	do {
-		u8 status = chip->ops->status(chip);
+		status = tpm_chip_status(chip);
 		if ((status & chip->ops->req_complete_mask) ==
 		    chip->ops->req_complete_val)
 			goto out_recv;
 
-		if (chip->ops->req_canceled(chip, status)) {
+		if (tpm_chip_req_canceled(chip, status)) {
 			dev_err(&chip->dev, "Operation Canceled\n");
 			return -ECANCELED;
 		}
@@ -118,7 +143,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, void *buf, size_t bufsiz)
 		rmb();
 	} while (time_before(jiffies, stop));
 
-	chip->ops->cancel(chip);
+	tpm_chip_cancel(chip);
 	dev_err(&chip->dev, "Operation Timed out\n");
 	return -ETIME;
 
diff --git a/drivers/char/tpm/tpm_ftpm_tee.c b/drivers/char/tpm/tpm_ftpm_tee.c
index 8d9209dfc384..53ba28ccd5d3 100644
--- a/drivers/char/tpm/tpm_ftpm_tee.c
+++ b/drivers/char/tpm/tpm_ftpm_tee.c
@@ -164,30 +164,10 @@ static int ftpm_tee_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t len)
 	return 0;
 }
 
-static void ftpm_tee_tpm_op_cancel(struct tpm_chip *chip)
-{
-	/* not supported */
-}
-
-static u8 ftpm_tee_tpm_op_status(struct tpm_chip *chip)
-{
-	return 0;
-}
-
-static bool ftpm_tee_tpm_req_canceled(struct tpm_chip *chip, u8 status)
-{
-	return false;
-}
-
 static const struct tpm_class_ops ftpm_tee_tpm_ops = {
 	.flags = TPM_OPS_AUTO_STARTUP,
 	.recv = ftpm_tee_tpm_op_recv,
 	.send = ftpm_tee_tpm_op_send,
-	.cancel = ftpm_tee_tpm_op_cancel,
-	.status = ftpm_tee_tpm_op_status,
-	.req_complete_mask = 0,
-	.req_complete_val = 0,
-	.req_canceled = ftpm_tee_tpm_req_canceled,
 };
 
 /*
-- 
2.39.5