linux-kernel - [PATCH 1/3] habanalabs: generalize COMMS message sending procedure

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Date:   Mon, 13 Sep 2021 22:39:24 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Alon Mizrahi <amizrahi@...ana.ai>
Subject: [PATCH 1/3] habanalabs: generalize COMMS message sending procedure

From: Alon Mizrahi <amizrahi@...ana.ai>

Instead of having dedicated function per message that we want to send
to the firmware in COMMS protocol, have a generic function that we can
call to from other parts of the driver

Signed-off-by: Alon Mizrahi <amizrahi@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/firmware_if.c | 28 +++++++++++++-------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/misc/habanalabs/common/firmware_if.c b/drivers/misc/habanalabs/common/firmware_if.c
index 8d2568c63f19..4e68fb9d2a6b 100644
--- a/drivers/misc/habanalabs/common/firmware_if.c
+++ b/drivers/misc/habanalabs/common/firmware_if.c
@@ -2162,18 +2162,17 @@ static void hl_fw_linux_update_state(struct hl_device *hdev,
 }
 
 /**
- * hl_fw_dynamic_report_reset_cause - send a COMMS message with the cause
- *                                    of the newly triggered hard reset
+ * hl_fw_dynamic_send_msg - send a COMMS message with attached data
  *
  * @hdev: pointer to the habanalabs device structure
  * @fw_loader: managing structure for loading device's FW
- * @reset_cause: enumerated cause for the recent hard reset
+ * @msg_type: message type
+ * @data: data to be sent
  *
  * @return 0 on success, otherwise non-zero error code
  */
-static int hl_fw_dynamic_report_reset_cause(struct hl_device *hdev,
-		struct fw_load_mgr *fw_loader,
-		enum comms_reset_cause reset_cause)
+static int hl_fw_dynamic_send_msg(struct hl_device *hdev,
+		struct fw_load_mgr *fw_loader, u8 msg_type, void *data)
 {
 	struct lkd_msg_comms msg;
 	int rc;
@@ -2181,11 +2180,20 @@ static int hl_fw_dynamic_report_reset_cause(struct hl_device *hdev,
 	memset(&msg, 0, sizeof(msg));
 
 	/* create message to be sent */
-	msg.header.type = HL_COMMS_RESET_CAUSE_TYPE;
+	msg.header.type = msg_type;
 	msg.header.size = cpu_to_le16(sizeof(struct comms_msg_header));
 	msg.header.magic = cpu_to_le32(HL_COMMS_MSG_MAGIC);
 
-	msg.reset_cause = reset_cause;
+	switch (msg_type) {
+	case HL_COMMS_RESET_CAUSE_TYPE:
+		msg.reset_cause = *(__u8 *) data;
+		break;
+	default:
+		dev_err(hdev->dev,
+			"Send COMMS message - invalid message type %u\n",
+			msg_type);
+		return -EINVAL;
+	}
 
 	rc = hl_fw_dynamic_request_descriptor(hdev, fw_loader,
 			sizeof(struct lkd_msg_comms));
@@ -2252,8 +2260,8 @@ static int hl_fw_dynamic_init_cpu(struct hl_device *hdev,
 		goto protocol_err;
 
 	if (hdev->curr_reset_cause) {
-		rc = hl_fw_dynamic_report_reset_cause(hdev, fw_loader,
-				hdev->curr_reset_cause);
+		rc = hl_fw_dynamic_send_msg(hdev, fw_loader,
+				HL_COMMS_RESET_CAUSE_TYPE, &hdev->curr_reset_cause);
 		if (rc)
 			goto protocol_err;
 
-- 
2.17.1