Merge tag 'media/v4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull new experimental media request API from Mauro Carvalho Chehab:
 "A new media request API

  This API is needed to support device drivers that can dynamically
  change their parameters for each new frame. The latest versions of
  Google camera and codec HAL depends on such feature.

  At this stage, it supports only stateless codecs.

  It has been discussed for a long time (at least over the last 3-4
  years), and we finally reached to something that seem to work.

  This series contain both the API and core changes required to support
  it and a new m2m decoder driver (cedrus).

  As the current API is still experimental, the only real driver using
  it (cedrus) was added at staging[1]. We intend to keep it there for a
  while, in order to test the API. Only when we're sure that this API
  works for other cases (like encoders), we'll move this driver out of
  staging and set the API into a stone.

  [1] We added support for the vivid virtual driver (used only for
  testing) to it too, as it makes easier to test the API for the ones
  that don't have the cedrus hardware"

* tag 'media/v4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (53 commits)
  media: dt-bindings: Document the Rockchip VPU bindings
  media: platform: Add Cedrus VPU decoder driver
  media: dt-bindings: media: Document bindings for the Cedrus VPU driver
  media: v4l: Add definition for the Sunxi tiled NV12 format
  media: v4l: Add definitions for MPEG-2 slice format and metadata
  media: videobuf2-core: Rework and rename helper for request buffer count
  media: v4l2-ctrls.c: initialize an error return code with zero
  media: v4l2-compat-ioctl32.c: add missing documentation for a field
  media: media-request: update documentation
  media: media-request: EPERM -> EACCES/EBUSY
  media: v4l2-ctrls: improve media_request_(un)lock_for_update
  media: v4l2-ctrls: use media_request_(un)lock_for_access
  media: media-request: add media_request_(un)lock_for_access
  media: vb2: set reqbufs/create_bufs capabilities
  media: videodev2.h: add new capabilities for buffer types
  media: buffer.rst: only set V4L2_BUF_FLAG_REQUEST_FD for QBUF
  media: v4l2-ctrls: return -EACCES if request wasn't completed
  media: media-request: return -EINVAL for invalid request_fds
  media: vivid: add request support
  media: vivid: add mc
  ...

69 files changed, 4245 insertions, 345 deletions

diff --git a/drivers/media/Makefile b/drivers/media/Makefile
index 594b462ddf0e..985d35ec6b29 100644
--- a/drivers/media/Makefile
+++ b/drivers/media/Makefile
@@ -3,7 +3,8 @@
 # Makefile for the kernel multimedia device drivers.
 #
 
-media-objs	:= media-device.o media-devnode.o media-entity.o
+media-objs	:= media-device.o media-devnode.o media-entity.o \
+		   media-request.o
 
 #
 # I2C drivers should come before other drivers, otherwise they'll fail
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index d6d22cf77066..975ff5669f72 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -356,6 +356,8 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 			vb->planes[plane].length = plane_sizes[plane];
 			vb->planes[plane].min_length = plane_sizes[plane];
 		}
+		call_void_bufop(q, init_buffer, vb);
+
 		q->bufs[vb->index] = vb;
 
 		/* Allocate video buffer memory for the MMAP type */
@@ -497,8 +499,9 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
 			pr_info("     buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n",
 				vb->cnt_buf_init, vb->cnt_buf_cleanup,
 				vb->cnt_buf_prepare, vb->cnt_buf_finish);
-			pr_info("     buf_queue: %u buf_done: %u\n",
-				vb->cnt_buf_queue, vb->cnt_buf_done);
+			pr_info("     buf_queue: %u buf_done: %u buf_request_complete: %u\n",
+				vb->cnt_buf_queue, vb->cnt_buf_done,
+				vb->cnt_buf_request_complete);
 			pr_info("     alloc: %u put: %u prepare: %u finish: %u mmap: %u\n",
 				vb->cnt_mem_alloc, vb->cnt_mem_put,
 				vb->cnt_mem_prepare, vb->cnt_mem_finish,
@@ -683,7 +686,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 		}
 
 		/*
-		 * Call queue_cancel to clean up any buffers in the PREPARED or
+		 * Call queue_cancel to clean up any buffers in the
 		 * QUEUED state which is possible if buffers were prepared or
 		 * queued without ever calling STREAMON.
 		 */
@@ -930,6 +933,7 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 		/* sync buffers */
 		for (plane = 0; plane < vb->num_planes; ++plane)
 			call_void_memop(vb, finish, vb->planes[plane].mem_priv);
+		vb->synced = false;
 	}
 
 	spin_lock_irqsave(&q->done_lock, flags);
@@ -942,6 +946,14 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 		vb->state = state;
 	}
 	atomic_dec(&q->owned_by_drv_count);
+
+	if (vb->req_obj.req) {
+		/* This is not supported at the moment */
+		WARN_ON(state == VB2_BUF_STATE_REQUEUEING);
+		media_request_object_unbind(&vb->req_obj);
+		media_request_object_put(&vb->req_obj);
+	}
+
 	spin_unlock_irqrestore(&q->done_lock, flags);
 
 	trace_vb2_buf_done(q, vb);
@@ -976,20 +988,19 @@ EXPORT_SYMBOL_GPL(vb2_discard_done);
 /*
  * __prepare_mmap() - prepare an MMAP buffer
  */
-static int __prepare_mmap(struct vb2_buffer *vb, const void *pb)
+static int __prepare_mmap(struct vb2_buffer *vb)
 {
 	int ret = 0;
 
-	if (pb)
-		ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
-				 vb, pb, vb->planes);
+	ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
+			 vb, vb->planes);
 	return ret ? ret : call_vb_qop(vb, buf_prepare, vb);
 }
 
 /*
  * __prepare_userptr() - prepare a USERPTR buffer
  */
-static int __prepare_userptr(struct vb2_buffer *vb, const void *pb)
+static int __prepare_userptr(struct vb2_buffer *vb)
 {
 	struct vb2_plane planes[VB2_MAX_PLANES];
 	struct vb2_queue *q = vb->vb2_queue;
@@ -1000,12 +1011,10 @@ static int __prepare_userptr(struct vb2_buffer *vb, const void *pb)
 
 	memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
 	/* Copy relevant information provided by the userspace */
-	if (pb) {
-		ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
-				 vb, pb, planes);
-		if (ret)
-			return ret;
-	}
+	ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
+			 vb, planes);
+	if (ret)
+		return ret;
 
 	for (plane = 0; plane < vb->num_planes; ++plane) {
 		/* Skip the plane if already verified */
@@ -1105,7 +1114,7 @@ err:
 /*
  * __prepare_dmabuf() - prepare a DMABUF buffer
  */
-static int __prepare_dmabuf(struct vb2_buffer *vb, const void *pb)
+static int __prepare_dmabuf(struct vb2_buffer *vb)
 {
 	struct vb2_plane planes[VB2_MAX_PLANES];
 	struct vb2_queue *q = vb->vb2_queue;
@@ -1116,12 +1125,10 @@ static int __prepare_dmabuf(struct vb2_buffer *vb, const void *pb)
 
 	memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
 	/* Copy relevant information provided by the userspace */
-	if (pb) {
-		ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
-				 vb, pb, planes);
-		if (ret)
-			return ret;
-	}
+	ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
+			 vb, planes);
+	if (ret)
+		return ret;
 
 	for (plane = 0; plane < vb->num_planes; ++plane) {
 		struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd);
@@ -1250,9 +1257,10 @@ static void __enqueue_in_driver(struct vb2_buffer *vb)
 	call_void_vb_qop(vb, buf_queue, vb);
 }
 
-static int __buf_prepare(struct vb2_buffer *vb, const void *pb)
+static int __buf_prepare(struct vb2_buffer *vb)
 {
 	struct vb2_queue *q = vb->vb2_queue;
+	enum vb2_buffer_state orig_state = vb->state;
 	unsigned int plane;
 	int ret;
 
@@ -1261,26 +1269,31 @@ static int __buf_prepare(struct vb2_buffer *vb, const void *pb)
 		return -EIO;
 	}
 
+	if (vb->prepared)
+		return 0;
+	WARN_ON(vb->synced);
+
 	vb->state = VB2_BUF_STATE_PREPARING;
 
 	switch (q->memory) {
 	case VB2_MEMORY_MMAP:
-		ret = __prepare_mmap(vb, pb);
+		ret = __prepare_mmap(vb);
 		break;
 	case VB2_MEMORY_USERPTR:
-		ret = __prepare_userptr(vb, pb);
+		ret = __prepare_userptr(vb);
 		break;
 	case VB2_MEMORY_DMABUF:
-		ret = __prepare_dmabuf(vb, pb);
+		ret = __prepare_dmabuf(vb);
 		break;
 	default:
 		WARN(1, "Invalid queue type\n");
 		ret = -EINVAL;
+		break;
 	}
 
 	if (ret) {
 		dprintk(1, "buffer preparation failed: %d\n", ret);
-		vb->state = VB2_BUF_STATE_DEQUEUED;
+		vb->state = orig_state;
 		return ret;
 	}
 
@@ -1288,11 +1301,98 @@ static int __buf_prepare(struct vb2_buffer *vb, const void *pb)
 	for (plane = 0; plane < vb->num_planes; ++plane)
 		call_void_memop(vb, prepare, vb->planes[plane].mem_priv);
 
-	vb->state = VB2_BUF_STATE_PREPARED;
+	vb->synced = true;
+	vb->prepared = true;
+	vb->state = orig_state;
 
 	return 0;
 }
 
+static int vb2_req_prepare(struct media_request_object *obj)
+{
+	struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
+	int ret;
+
+	if (WARN_ON(vb->state != VB2_BUF_STATE_IN_REQUEST))
+		return -EINVAL;
+
+	mutex_lock(vb->vb2_queue->lock);
+	ret = __buf_prepare(vb);
+	mutex_unlock(vb->vb2_queue->lock);
+	return ret;
+}
+
+static void __vb2_dqbuf(struct vb2_buffer *vb);
+
+static void vb2_req_unprepare(struct media_request_object *obj)
+{
+	struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
+
+	mutex_lock(vb->vb2_queue->lock);
+	__vb2_dqbuf(vb);
+	vb->state = VB2_BUF_STATE_IN_REQUEST;
+	mutex_unlock(vb->vb2_queue->lock);
+	WARN_ON(!vb->req_obj.req);
+}
+
+int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
+		  struct media_request *req);
+
+static void vb2_req_queue(struct media_request_object *obj)
+{
+	struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
+
+	mutex_lock(vb->vb2_queue->lock);
+	vb2_core_qbuf(vb->vb2_queue, vb->index, NULL, NULL);
+	mutex_unlock(vb->vb2_queue->lock);
+}
+
+static void vb2_req_unbind(struct media_request_object *obj)
+{
+	struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
+
+	if (vb->state == VB2_BUF_STATE_IN_REQUEST)
+		call_void_bufop(vb->vb2_queue, init_buffer, vb);
+}
+
+static void vb2_req_release(struct media_request_object *obj)
+{
+	struct vb2_buffer *vb = container_of(obj, struct vb2_buffer, req_obj);
+
+	if (vb->state == VB2_BUF_STATE_IN_REQUEST)
+		vb->state = VB2_BUF_STATE_DEQUEUED;
+}
+
+static const struct media_request_object_ops vb2_core_req_ops = {
+	.prepare = vb2_req_prepare,
+	.unprepare = vb2_req_unprepare,
+	.queue = vb2_req_queue,
+	.unbind = vb2_req_unbind,
+	.release = vb2_req_release,
+};
+
+bool vb2_request_object_is_buffer(struct media_request_object *obj)
+{
+	return obj->ops == &vb2_core_req_ops;
+}
+EXPORT_SYMBOL_GPL(vb2_request_object_is_buffer);
+
+unsigned int vb2_request_buffer_cnt(struct media_request *req)
+{
+	struct media_request_object *obj;
+	unsigned long flags;
+	unsigned int buffer_cnt = 0;
+
+	spin_lock_irqsave(&req->lock, flags);
+	list_for_each_entry(obj, &req->objects, list)
+		if (vb2_request_object_is_buffer(obj))
+			buffer_cnt++;
+	spin_unlock_irqrestore(&req->lock, flags);
+
+	return buffer_cnt;
+}
+EXPORT_SYMBOL_GPL(vb2_request_buffer_cnt);
+
 int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
 {
 	struct vb2_buffer *vb;
@@ -1304,8 +1404,12 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
 			vb->state);
 		return -EINVAL;
 	}
+	if (vb->prepared) {
+		dprintk(1, "buffer already prepared\n");
+		return -EINVAL;
+	}
 
-	ret = __buf_prepare(vb, pb);
+	ret = __buf_prepare(vb);
 	if (ret)
 		return ret;
 
@@ -1314,7 +1418,7 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
 
 	dprintk(2, "prepare of buffer %d succeeded\n", vb->index);
 
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(vb2_core_prepare_buf);
 
@@ -1381,7 +1485,8 @@ static int vb2_start_streaming(struct vb2_queue *q)
 	return ret;
 }
 
-int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb)
+int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
+		  struct media_request *req)
 {
 	struct vb2_buffer *vb;
 	int ret;
@@ -1393,13 +1498,57 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb)
 
 	vb = q->bufs[index];
 
-	switch (vb->state) {
-	case VB2_BUF_STATE_DEQUEUED:
-		ret = __buf_prepare(vb, pb);
+	if ((req && q->uses_qbuf) ||
+	    (!req && vb->state != VB2_BUF_STATE_IN_REQUEST &&
+	     q->uses_requests)) {
+		dprintk(1, "queue in wrong mode (qbuf vs requests)\n");
+		return -EBUSY;
+	}
+
+	if (req) {
+		int ret;
+
+		q->uses_requests = 1;
+		if (vb->state != VB2_BUF_STATE_DEQUEUED) {
+			dprintk(1, "buffer %d not in dequeued state\n",
+				vb->index);
+			return -EINVAL;
+		}
+
+		media_request_object_init(&vb->req_obj);
+
+		/* Make sure the request is in a safe state for updating. */
+		ret = media_request_lock_for_update(req);
 		if (ret)
 			return ret;
-		break;
-	case VB2_BUF_STATE_PREPARED:
+		ret = media_request_object_bind(req, &vb2_core_req_ops,
+						q, true, &vb->req_obj);
+		media_request_unlock_for_update(req);
+		if (ret)
+			return ret;
+
+		vb->state = VB2_BUF_STATE_IN_REQUEST;
+		/* Fill buffer information for the userspace */
+		if (pb) {
+			call_void_bufop(q, copy_timestamp, vb, pb);
+			call_void_bufop(q, fill_user_buffer, vb, pb);
+		}
+
+		dprintk(2, "qbuf of buffer %d succeeded\n", vb->index);
+		return 0;
+	}
+
+	if (vb->state != VB2_BUF_STATE_IN_REQUEST)
+		q->uses_qbuf = 1;
+
+	switch (vb->state) {
+	case VB2_BUF_STATE_DEQUEUED:
+	case VB2_BUF_STATE_IN_REQUEST:
+		if (!vb->prepared) {
+			ret = __buf_prepare(vb);
+			if (ret)
+				return ret;
+		}
 		break;
 	case VB2_BUF_STATE_PREPARING:
 		dprintk(1, "buffer still being prepared\n");
@@ -1600,6 +1749,11 @@ static void __vb2_dqbuf(struct vb2_buffer *vb)
 			call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv);
 			vb->planes[i].dbuf_mapped = 0;
 		}
+	if (vb->req_obj.req) {
+		media_request_object_unbind(&vb->req_obj);
+		media_request_object_put(&vb->req_obj);
+	}
+	call_void_bufop(q, init_buffer, vb);
 }
 
 int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
@@ -1625,6 +1779,7 @@ int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
 	}
 
 	call_void_vb_qop(vb, buf_finish, vb);
+	vb->prepared = false;
 
 	if (pindex)
 		*pindex = vb->index;
@@ -1688,6 +1843,8 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
 	q->start_streaming_called = 0;
 	q->queued_count = 0;
 	q->error = 0;
+	q->uses_requests = 0;
+	q->uses_qbuf = 0;
 
 	/*
 	 * Remove all buffers from videobuf's list...
@@ -1712,19 +1869,38 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
 	 */
 	for (i = 0; i < q->num_buffers; ++i) {
 		struct vb2_buffer *vb = q->bufs[i];
+		struct media_request *req = vb->req_obj.req;
+
+		/*
+		 * If a request is associated with this buffer, then
+		 * call buf_request_cancel() to give the driver to complete()
+		 * related request objects. Otherwise those objects would
+		 * never complete.
+		 */
+		if (req) {
+			enum media_request_state state;
+			unsigned long flags;
+
+			spin_lock_irqsave(&req->lock, flags);
+			state = req->state;
+			spin_unlock_irqrestore(&req->lock, flags);
 
-		if (vb->state == VB2_BUF_STATE_PREPARED ||
-		    vb->state == VB2_BUF_STATE_QUEUED) {
+			if (state == MEDIA_REQUEST_STATE_QUEUED)
+				call_void_vb_qop(vb, buf_request_complete, vb);
+		}
+
+		if (vb->synced) {
 			unsigned int plane;
 
 			for (plane = 0; plane < vb->num_planes; ++plane)
 				call_void_memop(vb, finish,
 						vb->planes[plane].mem_priv);
+			vb->synced = false;
 		}
 
-		if (vb->state != VB2_BUF_STATE_DEQUEUED) {
-			vb->state = VB2_BUF_STATE_PREPARED;
+		if (vb->prepared) {
 			call_void_vb_qop(vb, buf_finish, vb);
+			vb->prepared = false;
 		}
 		__vb2_dqbuf(vb);
 	}
@@ -2281,7 +2457,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
 		 * Queue all buffers.
 		 */
 		for (i = 0; i < q->num_buffers; i++) {
-			ret = vb2_core_qbuf(q, i, NULL);
+			ret = vb2_core_qbuf(q, i, NULL, NULL);
 			if (ret)
 				goto err_reqbufs;
 			fileio->bufs[i].queued = 1;
@@ -2460,7 +2636,7 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_
 
 		if (copy_timestamp)
 			b->timestamp = ktime_get_ns();
-		ret = vb2_core_qbuf(q, index, NULL);
+		ret = vb2_core_qbuf(q, index, NULL, NULL);
 		dprintk(5, "vb2_dbuf result: %d\n", ret);
 		if (ret)
 			return ret;
@@ -2563,7 +2739,7 @@ static int vb2_thread(void *data)
 		if (copy_timestamp)
 			vb->timestamp = ktime_get_ns();
 		if (!threadio->stop)
-			ret = vb2_core_qbuf(q, vb->index, NULL);
+			ret = vb2_core_qbuf(q, vb->index, NULL, NULL);
 		call_void_qop(q, wait_prepare, q);
 		if (ret || threadio->stop)
 			break;
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 886a2d8d5c6c..a17033ab2c22 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -25,6 +25,7 @@
 #include <linux/kthread.h>
 
 #include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
 #include <media/v4l2-fh.h>
 #include <media/v4l2-event.h>
 #include <media/v4l2-common.h>
@@ -40,10 +41,12 @@ module_param(deb