linux-kernel - [PATCH v4 2/2] tpm: ibmvtpm: Rename tpm_process_cmd to tpm

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Message-Id: <20210809192159.2176580-3-stefanb@linux.vnet.ibm.com>
Date:   Mon,  9 Aug 2021 15:21:59 -0400
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     jarkko@...nel.org
Cc:     nasastry@...ibm.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Stefan Berger <stefanb@...ux.ibm.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>
Subject: [PATCH v4 2/2] tpm: ibmvtpm: Rename tpm_process_cmd to tpm_status and define flag

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

Rename the field tpm_processing_cmd to tpm_status in ibmvtpm_dev and set
the TPM_STATUS_BUSY flag while the vTPM is busy processing a command.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
Cc: Nayna Jain <nayna@...ux.ibm.com>
Cc: George Wilson <gcwilson@...ux.ibm.com>
---
 drivers/char/tpm/tpm_ibmvtpm.c | 15 ++++++++-------
 drivers/char/tpm/tpm_ibmvtpm.h |  3 ++-
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index 7a9eca5768f8..5d795866b483 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -215,11 +215,12 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 		return -EIO;
 	}
 
-	if (ibmvtpm->tpm_processing_cmd) {
+	if ((ibmvtpm->tpm_status & TPM_STATUS_BUSY)) {
 		dev_info(ibmvtpm->dev,
 		         "Need to wait for TPM to finish\n");
 		/* wait for previous command to finish */
-		sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
+		sig = wait_event_interruptible(ibmvtpm->wq,
+				(ibmvtpm->tpm_status & TPM_STATUS_BUSY) == 0);
 		if (sig)
 			return -EINTR;
 	}
@@ -232,7 +233,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 	 * set the processing flag before the Hcall, since we may get the
 	 * result (interrupt) before even being able to check rc.
 	 */
-	ibmvtpm->tpm_processing_cmd = true;
+	ibmvtpm->tpm_status |= TPM_STATUS_BUSY;
 
 again:
 	rc = ibmvtpm_send_crq(ibmvtpm->vdev,
@@ -250,7 +251,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 			goto again;
 		}
 		dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
-		ibmvtpm->tpm_processing_cmd = false;
+		ibmvtpm->tpm_status &= ~TPM_STATUS_BUSY;
 	}
 
 	spin_unlock(&ibmvtpm->rtce_lock);
@@ -266,7 +267,7 @@ static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
 {
 	struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
 
-	return ibmvtpm->tpm_processing_cmd;
+	return ibmvtpm->tpm_status;
 }
 
 /**
@@ -454,7 +455,7 @@ static const struct tpm_class_ops tpm_ibmvtpm = {
 	.send = tpm_ibmvtpm_send,
 	.cancel = tpm_ibmvtpm_cancel,
 	.status = tpm_ibmvtpm_status,
-	.req_complete_mask = true,
+	.req_complete_mask = TPM_STATUS_BUSY,
 	.req_complete_val = 0,
 	.req_canceled = tpm_ibmvtpm_req_canceled,
 };
@@ -547,7 +548,7 @@ static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
 		case VTPM_TPM_COMMAND_RES:
 			/* len of the data in rtce buffer */
 			ibmvtpm->res_len = be16_to_cpu(crq->len);
-			ibmvtpm->tpm_processing_cmd = false;
+			ibmvtpm->tpm_status &= ~TPM_STATUS_BUSY;
 			wake_up_interruptible(&ibmvtpm->wq);
 			return;
 		default:
diff --git a/drivers/char/tpm/tpm_ibmvtpm.h b/drivers/char/tpm/tpm_ibmvtpm.h
index 51198b137461..252f1cccdfc5 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.h
+++ b/drivers/char/tpm/tpm_ibmvtpm.h
@@ -41,7 +41,8 @@ struct ibmvtpm_dev {
 	wait_queue_head_t wq;
 	u16 res_len;
 	u32 vtpm_version;
-	u8 tpm_processing_cmd;
+	u8 tpm_status;
+#define TPM_STATUS_BUSY		(1 << 0) /* vtpm is processing a command */
 };
 
 #define CRQ_RES_BUF_SIZE	PAGE_SIZE
-- 
2.31.1