media: atomisp: Also track buffers in a list when submitted to the ISP

Instead of using an integer to keep count of how many buffers have
been handed over to the ISP (buffers_in_css) move buffers handed
over to the ISP to a new buffers_in_css list_head so that we can
easily loop over them.

This removes the need for atomisp_flush_video_pipe() to loop over
all buffers and then (ab)use the state to figure out if they
were handed over to the ISP.

Since the buffers are now always on a list when owned by the driver
this also allows the buffer_done path on flush vs normal completion
to be unified (both now need a list_del()) and this common code can
now be factored out into a new atomisp_buffer_done() helper.

This is a preparation patch for moving the driver over to
the videobuf2 framework.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_cmd.c

@@ -634,10 +634,6 @@ void atomisp_clear_css_buffer_counters(struct atomisp_sub_device *asd)
 		memset(asd->metadata_bufs_in_css[i], 0,
 		       sizeof(asd->metadata_bufs_in_css[i]));
 	asd->dis_bufs_in_css = 0;
-	asd->video_out_capture.buffers_in_css = 0;
-	asd->video_out_vf.buffers_in_css = 0;
-	asd->video_out_preview.buffers_in_css = 0;
-	asd->video_out_video_capture.buffers_in_css = 0;
 }
 
 /* 0x100000 is the start of dmem inside SP */
@@ -683,40 +679,65 @@ static struct videobuf_buffer *atomisp_css_frame_to_vbuf(
 	return NULL;
 }
 
-static void atomisp_flush_video_pipe(struct atomisp_sub_device *asd,
-				     struct atomisp_video_pipe *pipe)
+int atomisp_buffers_in_css(struct atomisp_video_pipe *pipe)
 {
 	unsigned long irqflags;
-	int i;
+	struct list_head *pos;
+	int buffers_in_css = 0;
 
-	if (!pipe->users)
-		return;
+	spin_lock_irqsave(&pipe->irq_lock, irqflags);
 
-	for (i = 0; pipe->capq.bufs[i]; i++) {
-		spin_lock_irqsave(&pipe->irq_lock, irqflags);
-		if (pipe->capq.bufs[i]->state == VIDEOBUF_ACTIVE ||
-		    pipe->capq.bufs[i]->state == VIDEOBUF_QUEUED) {
-			pipe->capq.bufs[i]->ts = ktime_get_ns();
-			pipe->capq.bufs[i]->field_count =
-			    atomic_read(&asd->sequence) << 1;
-			dev_dbg(asd->isp->dev, "release buffers on device %s\n",
-				pipe->vdev.name);
-			if (pipe->capq.bufs[i]->state == VIDEOBUF_QUEUED)
-				list_del_init(&pipe->capq.bufs[i]->queue);
-			pipe->capq.bufs[i]->state = VIDEOBUF_ERROR;
-			wake_up(&pipe->capq.bufs[i]->done);
-		}
-		spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
+	list_for_each(pos, &pipe->buffers_in_css)
+		buffers_in_css++;
+
+	spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
+
+	return buffers_in_css;
+}
+
+void atomisp_buffer_done(struct atomisp_video_pipe *pipe, struct videobuf_buffer *vb,
+			 int state)
+{
+	lockdep_assert_held(&pipe->irq_lock);
+
+	vb->ts = ktime_get_ns();
+	vb->field_count = atomic_read(&pipe->asd->sequence) << 1;
+	vb->state = state;
+	list_del(&vb->queue);
+	wake_up(&vb->done);
+}
+
+void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, bool warn_on_css_frames)
+{
+	struct videobuf_buffer *_vb, *vb;
+	unsigned long irqflags;
+
+	spin_lock_irqsave(&pipe->irq_lock, irqflags);
+
+	list_for_each_entry_safe(vb, _vb, &pipe->buffers_in_css, queue) {
+		if (warn_on_css_frames)
+			dev_warn(pipe->isp->dev, "Warning: CSS frames queued on flush\n");
+		atomisp_buffer_done(pipe, vb, VIDEOBUF_ERROR);
 	}
+
+	list_for_each_entry_safe(vb, _vb, &pipe->activeq, queue)
+		atomisp_buffer_done(pipe, vb, VIDEOBUF_ERROR);
+
+	list_for_each_entry_safe(vb, _vb, &pipe->buffers_waiting_for_param, queue) {
+		pipe->frame_request_config_id[vb->i] = 0;
+		atomisp_buffer_done(pipe, vb, VIDEOBUF_ERROR);
+	}
+
+	spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
 }
 
 /* Returns queued buffers back to video-core */
 void atomisp_flush_bufs_and_wakeup(struct atomisp_sub_device *asd)
 {
-	atomisp_flush_video_pipe(asd, &asd->video_out_capture);
-	atomisp_flush_video_pipe(asd, &asd->video_out_vf);
-	atomisp_flush_video_pipe(asd, &asd->video_out_preview);
-	atomisp_flush_video_pipe(asd, &asd->video_out_video_capture);
+	atomisp_flush_video_pipe(&asd->video_out_capture, false);
+	atomisp_flush_video_pipe(&asd->video_out_vf, false);
+	atomisp_flush_video_pipe(&asd->video_out_preview, false);
+	atomisp_flush_video_pipe(&asd->video_out_video_capture, false);
 }
 
 /* clean out the parameters that did not apply */
@@ -974,7 +995,6 @@ void atomisp_buf_done(struct atomisp_sub_device *asd, int error,
 		break;
 	case IA_CSS_BUFFER_TYPE_VF_OUTPUT_FRAME:
 	case IA_CSS_BUFFER_TYPE_SEC_VF_OUTPUT_FRAME:
-		pipe->buffers_in_css--;
 		frame = buffer.css_buffer.data.frame;
 		if (!frame) {
 			WARN_ON(1);
@@ -1026,7 +1046,6 @@ void atomisp_buf_done(struct atomisp_sub_device *asd, int error,
 		break;
 	case IA_CSS_BUFFER_TYPE_OUTPUT_FRAME:
 	case IA_CSS_BUFFER_TYPE_SEC_OUTPUT_FRAME:
-		pipe->buffers_in_css--;
 		frame = buffer.css_buffer.data.frame;
 		if (!frame) {
 			WARN_ON(1);
@@ -1179,19 +1198,9 @@ void atomisp_buf_done(struct atomisp_sub_device *asd, int error,
 		break;
 	}
 	if (vb) {
-		vb->ts = ktime_get_ns();
-		vb->field_count = atomic_read(&asd->sequence) << 1;
-		/*mark videobuffer done for dequeue*/
 		spin_lock_irqsave(&pipe->irq_lock, irqflags);
-		vb->state = !error ? VIDEOBUF_DONE : VIDEOBUF_ERROR;
+		atomisp_buffer_done(pipe, vb, error ? VIDEOBUF_ERROR : VIDEOBUF_DONE);
 		spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
-
-		/*
-		 * Frame capture done, wake up any process block on
-		 * current active buffer
-		 * possibly hold by videobuf_dqbuf()
-		 */
-		wake_up(&vb->done);
 	}
 
 	/*

drivers/staging/media/atomisp/pci/atomisp_cmd.h

@@ -55,6 +55,10 @@ void dump_sp_dmem(struct atomisp_device *isp, unsigned int addr,
 struct camera_mipi_info *atomisp_to_sensor_mipi_info(struct v4l2_subdev *sd);
 struct atomisp_video_pipe *atomisp_to_video_pipe(struct video_device *dev);
 int atomisp_reset(struct atomisp_device *isp);
+int atomisp_buffers_in_css(struct atomisp_video_pipe *pipe);
+void atomisp_buffer_done(struct atomisp_video_pipe *pipe, struct videobuf_buffer *buf,
+			 int state);
+void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, bool warn_on_css_frames);
 void atomisp_flush_bufs_and_wakeup(struct atomisp_sub_device *asd);
 void atomisp_clear_css_buffer_counters(struct atomisp_sub_device *asd);
 

drivers/staging/media/atomisp/pci/atomisp_fops.c

@@ -217,7 +217,9 @@ static int atomisp_q_video_buffers_to_css(struct atomisp_sub_device *asd,
 	struct ia_css_dvs_grid_info *dvs_grid =
 	    atomisp_css_get_dvs_grid_info(&asd->params.curr_grid_info);
 	unsigned long irqflags;
-	int err = 0;
+	int space, err = 0;
+
+	lockdep_assert_held(&asd->isp->mutex);
 
 	if (WARN_ON(css_pipe_id >= IA_CSS_PIPE_ID_NUM))
 		return -EINVAL;
@@ -225,20 +227,21 @@ static int atomisp_q_video_buffers_to_css(struct atomisp_sub_device *asd,
 	if (pipe->stopping)
 		return -EINVAL;
 
-	while (pipe->buffers_in_css < ATOMISP_CSS_Q_DEPTH) {
+	space = ATOMISP_CSS_Q_DEPTH - atomisp_buffers_in_css(pipe);
+	while (space--) {
 		struct videobuf_buffer *vb;
 
 		spin_lock_irqsave(&pipe->irq_lock, irqflags);
-		if (list_empty(&pipe->activeq)) {
-			spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
-			return -EINVAL;
+		vb = list_first_entry_or_null(&pipe->activeq, struct videobuf_buffer, queue);
+		if (vb) {
+			list_move_tail(&vb->queue, &pipe->buffers_in_css);
+			vb->state = VIDEOBUF_ACTIVE;
 		}
-		vb = list_entry(pipe->activeq.next,
-				struct videobuf_buffer, queue);
-		list_del_init(&vb->queue);
-		vb->state = VIDEOBUF_ACTIVE;
 		spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
 
+		if (!vb)
+			return -EINVAL;
+
 		/*
 		 * If there is a per_frame setting to apply on the buffer,
 		 * do it before buffer en-queueing.
@@ -291,14 +294,13 @@ static int atomisp_q_video_buffers_to_css(struct atomisp_sub_device *asd,
 						    css_buf_type, css_pipe_id);
 		if (err) {
 			spin_lock_irqsave(&pipe->irq_lock, irqflags);
-			list_add_tail(&vb->queue, &pipe->activeq);
+			list_move_tail(&vb->queue, &pipe->activeq);
 			vb->state = VIDEOBUF_QUEUED;
 			spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
 			dev_err(asd->isp->dev, "%s, css q fails: %d\n",
 				__func__, err);
 			return -EINVAL;
 		}
-		pipe->buffers_in_css++;
 
 		/* enqueue 3A/DIS/metadata buffers */
 		if (asd->params.curr_grid_info.s3a_grid.enable &&

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -1762,7 +1762,7 @@ int atomisp_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 	mutex_unlock(&isp->mutex);
 	/* wait max 1 second */
 	ret = wait_event_interruptible_timeout(pipe->capq.wait,
-					       pipe->buffers_in_css == 0, HZ);
+					       atomisp_buffers_in_css(pipe) == 0, HZ);
 	mutex_lock(&isp->mutex);
 	pipe->stopping = false;
 	if (ret <= 0)

drivers/staging/media/atomisp/pci/atomisp_subdev.c

@@ -1064,6 +1064,7 @@ static void atomisp_init_subdev_pipe(struct atomisp_sub_device *asd,
 	pipe->asd = asd;
 	pipe->isp = asd->isp;
 	spin_lock_init(&pipe->irq_lock);
+	INIT_LIST_HEAD(&pipe->buffers_in_css);
 	INIT_LIST_HEAD(&pipe->activeq);
 	INIT_LIST_HEAD(&pipe->buffers_waiting_for_param);
 	INIT_LIST_HEAD(&pipe->per_frame_params);

drivers/staging/media/atomisp/pci/atomisp_subdev.h

@@ -70,6 +70,9 @@ struct atomisp_video_pipe {
 	enum v4l2_buf_type type;
 	struct media_pad pad;
 	struct videobuf_queue capq;
+	/* List of video-buffers handed over to the CSS  */
+	struct list_head buffers_in_css;
+	/* List of video-buffers handed over to the driver, but not yet to the CSS */
 	struct list_head activeq;
 	/*
 	 * the buffers waiting for per-frame parameters, this is only valid
@@ -83,7 +86,6 @@ struct atomisp_video_pipe {
 	unsigned int default_run_mode;
 	/* Set from streamoff to disallow queuing further buffers in CSS */
 	bool stopping;
-	unsigned int buffers_in_css;
 
 	/*
 	 * irq_lock is used to protect video buffer state change operations and