linux-kernel - [PATCH v2] media: amphion: handle firmware debug message

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Date:   Wed, 23 Aug 2023 10:38:37 +0800
From:   Ming Qian <ming.qian@....com>
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        xiahong.bao@....com, eagle.zhou@....com, tao.jiang_2@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2] media: amphion: handle firmware debug message

decoder firmware may notify host some debug message,
it can help analyze the state of the firmware in case of error

Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Signed-off-by: Ming Qian <ming.qian@....com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
---
v2
- force to terminate string message data
 drivers/media/platform/amphion/vpu_defs.h    | 1 +
 drivers/media/platform/amphion/vpu_helpers.c | 1 +
 drivers/media/platform/amphion/vpu_malone.c  | 1 +
 drivers/media/platform/amphion/vpu_msgs.c    | 9 +++++++++
 drivers/media/platform/amphion/vpu_rpc.c     | 3 ++-
 5 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/amphion/vpu_defs.h b/drivers/media/platform/amphion/vpu_defs.h
index 667637eedb5d..7320852668d6 100644
--- a/drivers/media/platform/amphion/vpu_defs.h
+++ b/drivers/media/platform/amphion/vpu_defs.h
@@ -71,6 +71,7 @@ enum {
 	VPU_MSG_ID_TIMESTAMP_INFO,
 	VPU_MSG_ID_FIRMWARE_XCPT,
 	VPU_MSG_ID_PIC_SKIPPED,
+	VPU_MSG_ID_DBG_MSG,
 };
 
 enum VPU_ENC_MEMORY_RESOURSE {
diff --git a/drivers/media/platform/amphion/vpu_helpers.c b/drivers/media/platform/amphion/vpu_helpers.c
index af3b336e5dc3..d12310af9ebc 100644
--- a/drivers/media/platform/amphion/vpu_helpers.c
+++ b/drivers/media/platform/amphion/vpu_helpers.c
@@ -489,6 +489,7 @@ const char *vpu_id_name(u32 id)
 	case VPU_MSG_ID_UNSUPPORTED: return "unsupported";
 	case VPU_MSG_ID_FIRMWARE_XCPT: return "exception";
 	case VPU_MSG_ID_PIC_SKIPPED: return "skipped";
+	case VPU_MSG_ID_DBG_MSG: return "debug msg";
 	}
 	return "<unknown>";
 }
diff --git a/drivers/media/platform/amphion/vpu_malone.c b/drivers/media/platform/amphion/vpu_malone.c
index f771661980c0..d3425de7bccd 100644
--- a/drivers/media/platform/amphion/vpu_malone.c
+++ b/drivers/media/platform/amphion/vpu_malone.c
@@ -745,6 +745,7 @@ static struct vpu_pair malone_msgs[] = {
 	{VPU_MSG_ID_UNSUPPORTED, VID_API_EVENT_UNSUPPORTED_STREAM},
 	{VPU_MSG_ID_FIRMWARE_XCPT, VID_API_EVENT_FIRMWARE_XCPT},
 	{VPU_MSG_ID_PIC_SKIPPED, VID_API_EVENT_PIC_SKIPPED},
+	{VPU_MSG_ID_DBG_MSG, VID_API_EVENT_DBG_MSG_DEC},
 };
 
 static void vpu_malone_pack_fs_alloc(struct vpu_rpc_event *pkt,
diff --git a/drivers/media/platform/amphion/vpu_msgs.c b/drivers/media/platform/amphion/vpu_msgs.c
index d0ead051f7d1..999efeaebfd5 100644
--- a/drivers/media/platform/amphion/vpu_msgs.c
+++ b/drivers/media/platform/amphion/vpu_msgs.c
@@ -180,6 +180,14 @@ static void vpu_session_handle_pic_skipped(struct vpu_inst *inst, struct vpu_rpc
 	vpu_inst_unlock(inst);
 }
 
+static void vpu_session_handle_dbg_msg(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
+{
+	char *str = (char *)pkt->data;
+
+	if (strlen(str))
+		dev_info(inst->dev, "instance %d firmware dbg msg : %s\n", inst->id, str);
+}
+
 static struct vpu_msg_handler handlers[] = {
 	{VPU_MSG_ID_START_DONE, vpu_session_handle_start_done},
 	{VPU_MSG_ID_STOP_DONE, vpu_session_handle_stop_done},
@@ -196,6 +204,7 @@ static struct vpu_msg_handler handlers[] = {
 	{VPU_MSG_ID_UNSUPPORTED, vpu_session_handle_error},
 	{VPU_MSG_ID_FIRMWARE_XCPT, vpu_session_handle_firmware_xcpt},
 	{VPU_MSG_ID_PIC_SKIPPED, vpu_session_handle_pic_skipped},
+	{VPU_MSG_ID_DBG_MSG, vpu_session_handle_dbg_msg},
 };
 
 static int vpu_session_handle_msg(struct vpu_inst *inst, struct vpu_rpc_event *msg)
diff --git a/drivers/media/platform/amphion/vpu_rpc.c b/drivers/media/platform/amphion/vpu_rpc.c
index f626a9f835e0..8234370afee5 100644
--- a/drivers/media/platform/amphion/vpu_rpc.c
+++ b/drivers/media/platform/amphion/vpu_rpc.c
@@ -144,7 +144,7 @@ static int vpu_rpc_receive_msg_buf(struct vpu_shared_addr *shared, struct vpu_rp
 	msg->hdr.num = (msgword >> 16) & 0xff;
 	msg->hdr.id = msgword & 0x3fff;
 
-	if (msg->hdr.num > ARRAY_SIZE(msg->data))
+	if (msg->hdr.num >= ARRAY_SIZE(msg->data))
 		return -EINVAL;
 
 	for (i = 0; i < msg->hdr.num; i++) {
@@ -156,6 +156,7 @@ static int vpu_rpc_receive_msg_buf(struct vpu_shared_addr *shared, struct vpu_rp
 			data = shared->msg_mem_vir;
 		}
 	}
+	msg->data[msg->hdr.num] = 0;
 
 	/*update rptr after data is read*/
 	mb();
-- 
2.38.1