media: v4l2-ioctl.c: use correct vb2_queue lock for m2m devices

For m2m devices the vdev->queue lock was always taken instead of the
lock for the specific capture or output queue. Now that we pushed
the locking down into __video_do_ioctl() we can pick the correct
lock and potentially improve the performance of m2m devices.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -29,6 +29,7 @@
 #include <media/v4l2-device.h>
 #include <media/videobuf2-v4l2.h>
 #include <media/v4l2-mc.h>
+#include <media/v4l2-mem2mem.h>
 
 #include <trace/events/v4l2.h>
 
@@ -2670,11 +2671,62 @@ static bool v4l2_is_known_ioctl(unsigned int cmd)
 	return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
 }
 
+#if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)
+static bool v4l2_ioctl_m2m_queue_is_output(unsigned int cmd, void *arg)
+{
+	switch (cmd) {
+	case VIDIOC_CREATE_BUFS: {
+		struct v4l2_create_buffers *cbufs = arg;
+
+		return V4L2_TYPE_IS_OUTPUT(cbufs->format.type);
+	}
+	case VIDIOC_REQBUFS: {
+		struct v4l2_requestbuffers *rbufs = arg;
+
+		return V4L2_TYPE_IS_OUTPUT(rbufs->type);
+	}
+	case VIDIOC_QBUF:
+	case VIDIOC_DQBUF:
+	case VIDIOC_QUERYBUF:
+	case VIDIOC_PREPARE_BUF: {
+		struct v4l2_buffer *buf = arg;
+
+		return V4L2_TYPE_IS_OUTPUT(buf->type);
+	}
+	case VIDIOC_EXPBUF: {
+		struct v4l2_exportbuffer *expbuf = arg;
+
+		return V4L2_TYPE_IS_OUTPUT(expbuf->type);
+	}
+	case VIDIOC_STREAMON:
+	case VIDIOC_STREAMOFF: {
+		int *type = arg;
+
+		return V4L2_TYPE_IS_OUTPUT(*type);
+	}
+	default:
+		return false;
+	}
+}
+#endif
+
 static struct mutex *v4l2_ioctl_get_lock(struct video_device *vdev,
-					 unsigned int cmd)
+					 struct v4l2_fh *vfh, unsigned int cmd,
+					 void *arg)
 {
 	if (_IOC_NR(cmd) >= V4L2_IOCTLS)
 		return vdev->lock;
+#if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)
+	if (vfh && vfh->m2m_ctx &&
+	    (v4l2_ioctls[_IOC_NR(cmd)].flags & INFO_FL_QUEUE)) {
+		bool is_output = v4l2_ioctl_m2m_queue_is_output(cmd, arg);
+		struct v4l2_m2m_queue_ctx *ctx = is_output ?
+			&vfh->m2m_ctx->out_q_ctx : &vfh->m2m_ctx->cap_q_ctx;
+
+		if (ctx->q.lock)
+			return ctx->q.lock;
+	}
+#endif
 	if (vdev->queue && vdev->queue->lock &&
 			(v4l2_ioctls[_IOC_NR(cmd)].flags & INFO_FL_QUEUE))
 		return vdev->queue->lock;
@@ -2741,7 +2793,7 @@ static long __video_do_ioctl(struct file *file,
 	if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags))
 		vfh = file->private_data;
 
-	lock = v4l2_ioctl_get_lock(vfd, cmd);
+	lock = v4l2_ioctl_get_lock(vfd, vfh, cmd, arg);
 
 	if (lock && mutex_lock_interruptible(lock))
 		return -ERESTARTSYS;