media: staging/intel-ipu3: parameter buffer refactoring

Current ImgU driver processes and releases the parameter buffer
immediately after queued from user. This does not align with other
image buffers which are grouped in sets and used for the same frame.
If user queues multiple parameter buffers continuously, only the last
one will take effect.
To make consistent buffers usage, this patch changes the parameter
buffer handling and group parameter buffer with other image buffers
for each frame.
Each time driver will queue one more group of buffers when previous
frame processed and buffers consumed by css.

Signed-off-by: Tianshu Qiu <tian.shu.qiu@intel.com>
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/ipu3/ipu3-css.c

@@ -2171,11 +2171,6 @@ int imgu_css_set_parameters(struct imgu_css *css, unsigned int pipe,
 	obgrid_size = imgu_css_fw_obgrid_size(bi);
 	stripes = bi->info.isp.sp.iterator.num_stripes ? : 1;
 
-	/*
-	 * TODO(b/118782861): If userspace queues more than 4 buffers, the
-	 * parameters from previous buffers will be overwritten. Fix the driver
-	 * not to allow this.
-	 */
 	imgu_css_pool_get(&css_pipe->pool.parameter_set_info);
 	param_set = imgu_css_pool_last(&css_pipe->pool.parameter_set_info,
 				       0)->vaddr;

drivers/staging/media/ipu3/ipu3-v4l2.c

@@ -341,51 +341,37 @@ static void imgu_vb2_buf_queue(struct vb2_buffer *vb)
 	struct imgu_video_device *node =
 		container_of(vb->vb2_queue, struct imgu_video_device, vbq);
 	unsigned int queue = imgu_node_to_queue(node->id);
+	struct imgu_buffer *buf = container_of(vb, struct imgu_buffer,
+					       vid_buf.vbb.vb2_buf);
 	unsigned long need_bytes;
-	unsigned int pipe = node->pipe;
+	unsigned long payload = vb2_get_plane_payload(vb, 0);
 
 	if (vb->vb2_queue->type == V4L2_BUF_TYPE_META_CAPTURE ||
 	    vb->vb2_queue->type == V4L2_BUF_TYPE_META_OUTPUT)
 		need_bytes = node->vdev_fmt.fmt.meta.buffersize;
 	else
 		need_bytes = node->vdev_fmt.fmt.pix_mp.plane_fmt[0].sizeimage;
 
-	if (queue == IPU3_CSS_QUEUE_PARAMS) {
-		unsigned long payload = vb2_get_plane_payload(vb, 0);
-		struct vb2_v4l2_buffer *buf =
-			container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
-		int r = -EINVAL;
-
-		if (payload == 0) {
-			payload = need_bytes;
-			vb2_set_plane_payload(vb, 0, payload);
-		}
-		if (payload >= need_bytes)
-			r = imgu_css_set_parameters(&imgu->css, pipe,
-						    vb2_plane_vaddr(vb, 0));
-		buf->flags = V4L2_BUF_FLAG_DONE;
-		vb2_buffer_done(vb, r == 0 ? VB2_BUF_STATE_DONE
-					   : VB2_BUF_STATE_ERROR);
-
-	} else {
-		struct imgu_buffer *buf = container_of(vb, struct imgu_buffer,
-						       vid_buf.vbb.vb2_buf);
+	if (queue == IPU3_CSS_QUEUE_PARAMS && payload && payload < need_bytes) {
+		dev_err(&imgu->pci_dev->dev, "invalid data size for params.");
+		vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+		return;
+	}
 
-		mutex_lock(&imgu->lock);
+	mutex_lock(&imgu->lock);
+	if (queue != IPU3_CSS_QUEUE_PARAMS)
 		imgu_css_buf_init(&buf->css_buf, queue, buf->map.daddr);
-		list_add_tail(&buf->vid_buf.list,
-			      &node->buffers);
-		mutex_unlock(&imgu->lock);
 
-		vb2_set_plane_payload(&buf->vid_buf.vbb.vb2_buf, 0, need_bytes);
+	list_add_tail(&buf->vid_buf.list, &node->buffers);
+	mutex_unlock(&imgu->lock);
 
-		if (imgu->streaming)
-			imgu_queue_buffers(imgu, false, pipe);
-	}
+	vb2_set_plane_payload(vb, 0, need_bytes);
+
+	if (imgu->streaming)
+		imgu_queue_buffers(imgu, false, node->pipe);
 
 	dev_dbg(&imgu->pci_dev->dev, "%s for pipe %d node %d", __func__,
 		node->pipe, node->id);
-
 }
 
 static int imgu_vb2_queue_setup(struct vb2_queue *vq,

drivers/staging/media/ipu3/ipu3.c

@@ -236,6 +236,11 @@ int imgu_queue_buffers(struct imgu_device *imgu, bool initial, unsigned int pipe
 	dev_dbg(&imgu->pci_dev->dev, "Queue buffers to pipe %d", pipe);
 	mutex_lock(&imgu->lock);
 
+	if (!imgu_css_pipe_queue_empty(&imgu->css, pipe)) {
+		mutex_unlock(&imgu->lock);
+		return 0;
+	}
+
 	/* Buffer set is queued to FW only when input buffer is ready */
 	for (node = IMGU_NODE_NUM - 1;
 	     imgu_queue_getbuf(imgu, IMGU_NODE_IN, pipe);
@@ -246,6 +251,31 @@ int imgu_queue_buffers(struct imgu_device *imgu, bool initial, unsigned int pipe
 			dev_warn(&imgu->pci_dev->dev,
 				 "Vf not enabled, ignore queue");
 			continue;
+		} else if (node == IMGU_NODE_PARAMS &&
+			   imgu_pipe->nodes[node].enabled) {
+			struct vb2_buffer *vb;
+			struct imgu_vb2_buffer *ivb;
+
+			/* No parameters for this frame */
+			if (list_empty(&imgu_pipe->nodes[node].buffers))
+				continue;
+
+			ivb = list_first_entry(&imgu_pipe->nodes[node].buffers,
+					       struct imgu_vb2_buffer, list);
+			vb = &ivb->vbb.vb2_buf;
+			r = imgu_css_set_parameters(&imgu->css, pipe,
+						    vb2_plane_vaddr(vb, 0));
+			if (r) {
+				vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+				dev_warn(&imgu->pci_dev->dev,
+					 "set parameters failed.");
+				continue;
+			}
+
+			vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+			dev_dbg(&imgu->pci_dev->dev,
+				"queue user parameters %d to css.", vb->index);
+			list_del(&ivb->list);
 		} else if (imgu_pipe->queue_enabled[node]) {
 			struct imgu_css_buffer *buf =
 				imgu_queue_getbuf(imgu, node, pipe);