Re: [PATCH v2 1/1] video_video: Add the Virtio Video V4L2 driver

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Hi Dmitry,

On Wed, Feb 19, 2020 at 5:28 AM Dmitry Sepp <dmitry.sepp@xxxxxxxxxxxxxxx> wrote:
>
> This adds a Virtio based video driver for video streaming device that
> operates input and output data buffers to share video devices with
> several guests. The current implementation consist of V4L2 based video
> driver supporting video functions of decoder and encoder. The device
> uses command structures to advertise and negotiate stream formats and
> controls. This allows the driver to modify the processing logic of the
> device on a per stream basis.
>
> Signed-off-by: Dmitry Sepp <dmitry.sepp@xxxxxxxxxxxxxxx>
> Signed-off-by: Kiran Pawar <Kiran.Pawar@xxxxxxxxxxxxxxx>
> Signed-off-by: Nikolay Martyanov <Nikolay.Martyanov@xxxxxxxxxxxxxxx>
> Signed-off-by: Samiullah Khawaja <samiullah.khawaja@xxxxxxxxxxxxxxx>
> ---
>  drivers/media/Kconfig                       |    1 +
>  drivers/media/Makefile                      |    2 +
>  drivers/media/virtio/Kconfig                |   12 +
>  drivers/media/virtio/Makefile               |   12 +
>  drivers/media/virtio/virtio_video.h         |  402 +++++++
>  drivers/media/virtio/virtio_video_caps.c    |  498 +++++++++
>  drivers/media/virtio/virtio_video_dec.c     |  427 ++++++++
>  drivers/media/virtio/virtio_video_dec.h     |   30 +
>  drivers/media/virtio/virtio_video_device.c  | 1079 +++++++++++++++++++
>  drivers/media/virtio/virtio_video_driver.c  |  315 ++++++
>  drivers/media/virtio/virtio_video_enc.c     |  569 ++++++++++
>  drivers/media/virtio/virtio_video_enc.h     |   30 +
>  drivers/media/virtio/virtio_video_helpers.c |  250 +++++
>  drivers/media/virtio/virtio_video_vq.c      | 1012 +++++++++++++++++
>  include/uapi/linux/virtio_ids.h             |    2 +
>  include/uapi/linux/virtio_video.h           |  469 ++++++++
>  16 files changed, 5110 insertions(+)
>  create mode 100644 drivers/media/virtio/Kconfig
>  create mode 100644 drivers/media/virtio/Makefile
>  create mode 100644 drivers/media/virtio/virtio_video.h
>  create mode 100644 drivers/media/virtio/virtio_video_caps.c
>  create mode 100644 drivers/media/virtio/virtio_video_dec.c
>  create mode 100644 drivers/media/virtio/virtio_video_dec.h
>  create mode 100644 drivers/media/virtio/virtio_video_device.c
>  create mode 100644 drivers/media/virtio/virtio_video_driver.c
>  create mode 100644 drivers/media/virtio/virtio_video_enc.c
>  create mode 100644 drivers/media/virtio/virtio_video_enc.h
>  create mode 100644 drivers/media/virtio/virtio_video_helpers.c
>  create mode 100644 drivers/media/virtio/virtio_video_vq.c
>  create mode 100644 include/uapi/linux/virtio_video.h
>
> diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig
> index 092e7509af9b..b89169e5d24d 100644
> --- a/drivers/media/Kconfig
> +++ b/drivers/media/Kconfig
> @@ -205,6 +205,7 @@ source "drivers/media/pci/Kconfig"
>  source "drivers/media/platform/Kconfig"
>  source "drivers/media/mmc/Kconfig"
>  source "drivers/media/radio/Kconfig"
> +source "drivers/media/virtio/Kconfig"
>
>  comment "Supported FireWire (IEEE 1394) Adapters"
>         depends on DVB_CORE && FIREWIRE
> diff --git a/drivers/media/Makefile b/drivers/media/Makefile
> index 4a330d0e5e40..1d886730bafd 100644
> --- a/drivers/media/Makefile
> +++ b/drivers/media/Makefile
> @@ -34,6 +34,8 @@ obj-y += rc/
>
>  obj-$(CONFIG_CEC_CORE) += cec/
>
> +obj-$(CONFIG_VIRTIO_VIDEO)  += virtio/
> +
>  #
>  # Finally, merge the drivers that require the core
>  #
> diff --git a/drivers/media/virtio/Kconfig b/drivers/media/virtio/Kconfig
> new file mode 100644
> index 000000000000..82012178254d
> --- /dev/null
> +++ b/drivers/media/virtio/Kconfig
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +# Video driver for virtio
> +
> +config VIRTIO_VIDEO
> +       tristate "Virtio video V4L2 driver"
> +       depends on VIRTIO && VIDEO_DEV && VIDEO_V4L2
> +       select VIDEOBUF2_DMA_SG
> +       select VIDEOBUF2_DMA_CONTIG
> +       select V4L2_MEM2MEM_DEV
> +       help
> +          This is the virtual video driver for virtio.
> +          Say Y or M.
> diff --git a/drivers/media/virtio/Makefile b/drivers/media/virtio/Makefile
> new file mode 100644
> index 000000000000..b17dce4cfc19
> --- /dev/null
> +++ b/drivers/media/virtio/Makefile
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +obj-$(CONFIG_VIRTIO_VIDEO) += virtio-video.o
> +
> +virtio-video-objs := \
> +    virtio_video_driver.o \
> +    virtio_video_device.o \
> +    virtio_video_vq.o \
> +    virtio_video_dec.o \
> +    virtio_video_enc.o \
> +    virtio_video_caps.o \
> +    virtio_video_helpers.o
> diff --git a/drivers/media/virtio/virtio_video.h b/drivers/media/virtio/virtio_video.h
> new file mode 100644
> index 000000000000..c5a5704326c0
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video.h
> @@ -0,0 +1,402 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/* Common header for virtio video driver.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _VIRTIO_VIDEO_H
> +#define _VIRTIO_VIDEO_H
> +
> +#include <linux/virtio.h>
> +#include <linux/virtio_ids.h>
> +#include <linux/virtio_config.h>
> +#include <linux/virtio_video.h>
> +#include <linux/list.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/videobuf2-dma-sg.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#define DRIVER_NAME "virtio-video"
> +
> +#define MIN_BUFS_MIN 0
> +#define MIN_BUFS_MAX 32
> +#define MIN_BUFS_STEP 1
> +#define MIN_BUFS_DEF 1
> +
> +enum virtio_video_device_type {
> +       VIRTIO_VIDEO_DEVICE_ENCODER = 0x0100,
> +       VIRTIO_VIDEO_DEVICE_DECODER,
> +};
> +
> +struct video_format_frame {
> +       struct virtio_video_format_frame frame;
> +       struct virtio_video_format_range *frame_rates;
> +};
> +
> +struct video_format {
> +       struct list_head formats_list_entry;
> +       struct virtio_video_format_desc desc;
> +       struct video_format_frame *frames;
> +};
> +
> +struct video_control_fmt_data {
> +       uint32_t min;
> +       uint32_t max;
> +       uint32_t num;
> +       uint32_t skip_mask;
> +       uint32_t *entries;
> +};
> +
> +struct video_control_format {
> +       struct list_head controls_list_entry;
> +       uint32_t format;
> +       struct video_control_fmt_data *profile;
> +       struct video_control_fmt_data *level;
> +};
> +
> +struct video_plane_format {
> +       uint32_t plane_size;
> +       uint32_t stride;
> +};
> +
> +struct video_format_info {
> +       uint32_t fourcc_format;
> +       uint32_t frame_rate;
> +       uint32_t frame_width;
> +       uint32_t frame_height;
> +       uint32_t min_buffers;
> +       uint32_t max_buffers;
> +       struct virtio_video_crop crop;
> +       uint32_t num_planes;
> +       struct video_plane_format plane_format[VIRTIO_VIDEO_MAX_PLANES];
> +       bool is_updated;
> +};
> +
> +struct video_control_info {
> +       uint32_t profile;
> +       uint32_t level;
> +       uint32_t bitrate;
> +       bool is_updated;
> +};
> +
> +struct virtio_video;
> +struct virtio_video_vbuffer;
> +
> +typedef void (*virtio_video_resp_cb)(struct virtio_video *vv,
> +                                    struct virtio_video_vbuffer *vbuf);
> +
> +struct virtio_video_vbuffer {
> +       char *buf;
> +       int size;
> +
> +       void *data_buf;
> +       uint32_t data_size;
> +
> +       char *resp_buf;
> +       int resp_size;
> +
> +       void *priv;
> +       virtio_video_resp_cb resp_cb;
> +
> +       struct list_head list;
> +};
> +
> +struct virtio_video_queue {
> +       struct virtqueue *vq;
> +       spinlock_t qlock;
> +       wait_queue_head_t ack_queue;
> +       struct work_struct dequeue_work;
> +};
> +
> +struct virtio_video {
> +       struct v4l2_device v4l2_dev;
> +       int instance;
> +
> +       struct virtio_device *vdev;
> +       struct virtio_video_queue commandq;
> +       struct virtio_video_queue eventq;
> +       wait_queue_head_t wq;
> +       bool vq_ready;
> +
> +       struct kmem_cache *vbufs;
> +
> +       struct idr resource_idr;
> +       spinlock_t resource_idr_lock;
> +       struct idr stream_idr;
> +       spinlock_t stream_idr_lock;
> +
> +       uint32_t max_caps_len;
> +       uint32_t max_resp_len;
> +       bool got_caps;
> +       bool got_control;
> +
> +       bool has_iommu;
> +       bool supp_non_contig;
> +       struct list_head devices_list;
> +
> +       int debug;
> +       int use_dma_mem;
> +};
> +
> +struct virtio_video_device {
> +       struct virtio_video *vv;
> +       struct video_device video_dev;
> +       struct mutex video_dev_mutex;
> +
> +       struct v4l2_m2m_dev *m2m_dev;
> +
> +       struct workqueue_struct *workqueue;
> +
> +       struct list_head devices_list_entry;
> +       /* VIRTIO_VIDEO_FUNC_ */
> +       uint32_t type;
> +
> +       uint32_t num_input_fmts;
> +       struct list_head input_fmt_list;
> +
> +       uint32_t num_output_fmts;
> +       struct list_head output_fmt_list;
> +
> +       struct list_head controls_fmt_list;
> +};
> +
> +enum video_stream_state {
> +       STREAM_STATE_IDLE = 0,
> +       STREAM_STATE_INIT,
> +       STREAM_STATE_METADATA, /* specific to decoder */
> +       STREAM_STATE_RUNNING,
> +       STREAM_STATE_DRAIN,
> +       STREAM_STATE_STOPPED,
> +       STREAM_STATE_RESET, /* specific to encoder */
> +};
> +
> +struct virtio_video_stream {
> +       uint32_t stream_id;
> +       enum video_stream_state state;
> +       struct video_device *video_dev;
> +       struct v4l2_fh fh;
> +       struct mutex vq_mutex;
> +       struct v4l2_ctrl_handler ctrl_handler;
> +       struct video_format_info in_info;
> +       struct video_format_info out_info;
> +       struct video_control_info control;
> +       bool src_cleared;
> +       bool dst_cleared;
> +       bool src_destroyed;
> +       bool dst_destroyed;
> +       struct work_struct work;
> +       struct video_format_frame *current_frame;
> +};
> +
> +struct virtio_video_buffer {
> +       struct v4l2_m2m_buffer v4l2_m2m_vb;
> +       uint32_t resource_id;
> +       bool queued;
> +};
> +
> +static inline gfp_t
> +virtio_video_gfp_flags(struct virtio_video *vv)
> +{
> +       if (vv->use_dma_mem)
> +               return GFP_DMA;
> +       else
> +               return 0;
> +}
> +
> +static inline const struct vb2_mem_ops *
> +virtio_video_mem_ops(struct virtio_video *vv)
> +{
> +       if (vv->supp_non_contig)
> +               return &vb2_dma_sg_memops;
> +       else
> +               return &vb2_dma_contig_memops;
> +}
> +
> +static inline struct virtio_video_device *
> +to_virtio_vd(struct video_device *video_dev)
> +{
> +       return container_of(video_dev, struct virtio_video_device,
> +                        video_dev);
> +}
> +
> +static inline struct virtio_video_stream *file2stream(struct file *file)
> +{
> +       return container_of(file->private_data, struct virtio_video_stream, fh);
> +}
> +
> +static inline struct virtio_video_stream *ctrl2stream(struct v4l2_ctrl *ctrl)
> +{
> +       return container_of(ctrl->handler, struct virtio_video_stream,
> +                           ctrl_handler);
> +}
> +
> +static inline struct virtio_video_stream *work2stream(struct work_struct *work)
> +{
> +       return container_of(work, struct virtio_video_stream, work);
> +}
> +
> +static inline struct virtio_video_buffer *to_virtio_vb(struct vb2_buffer *vb)
> +{
> +       struct vb2_v4l2_buffer *v4l2_vb = to_vb2_v4l2_buffer(vb);
> +
> +       return container_of(v4l2_vb, struct virtio_video_buffer,
> +                           v4l2_m2m_vb.vb);
> +}
> +
> +static inline uint32_t to_virtio_queue_type(enum v4l2_buf_type type)
> +{
> +       if (V4L2_TYPE_IS_OUTPUT(type))
> +               return VIRTIO_VIDEO_QUEUE_TYPE_INPUT;
> +       else
> +               return VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT;
> +}
> +
> +static inline bool within_range(uint32_t min, uint32_t val, uint32_t max)
> +{
> +       return ((val - min) <= (max - min));
> +}
> +
> +static inline bool needs_alignment(uint32_t val, uint32_t a)
> +{
> +       if (a == 0 || IS_ALIGNED(val, a))
> +               return false;
> +
> +       return true;
> +}
> +
> +int virtio_video_alloc_vbufs(struct virtio_video *vv);
> +void virtio_video_free_vbufs(struct virtio_video *vv);
> +int virtio_video_alloc_events(struct virtio_video *vv, size_t num);
> +
> +int virtio_video_device_init(struct virtio_video *vv, void *input_buf,
> +                            void *output_buf);
> +void virtio_video_device_deinit(struct virtio_video *vv);
> +
> +void virtio_video_stream_id_get(struct virtio_video *vv,
> +                               struct virtio_video_stream *stream,
> +                               uint32_t *id);
> +void virtio_video_stream_id_put(struct virtio_video *vv, uint32_t id);
> +void virtio_video_resource_id_get(struct virtio_video *vv, uint32_t *id);
> +void virtio_video_resource_id_put(struct virtio_video *vv, uint32_t id);
> +
> +int virtio_video_cmd_stream_create(struct virtio_video *vv, uint32_t stream_id,
> +                                  enum virtio_video_format format,
> +                                  const char *tag);
> +int virtio_video_cmd_stream_destroy(struct virtio_video *vv,
> +                                   uint32_t stream_id);
> +int virtio_video_cmd_stream_drain(struct virtio_video *vv, uint32_t stream_id);
> +int virtio_video_cmd_resource_create(struct virtio_video *vv,
> +                                    uint32_t stream_id, uint32_t resource_id,
> +                                    uint32_t queue_type,
> +                                    struct virtio_video_mem_entry *ents,
> +                                   unsigned int num_planes,
> +                                    unsigned int *num_entry);
> +int virtio_video_cmd_resource_destroy_all(struct virtio_video *vv,
> +                                         struct virtio_video_stream *stream,
> +                                         uint32_t queue_type);
> +int virtio_video_cmd_resource_queue(struct virtio_video *vv, uint32_t stream_id,
> +                                   struct virtio_video_buffer *virtio_vb,
> +                                   uint32_t data_size[], uint8_t num_data_size,
> +                                   uint32_t queue_type);
> +int virtio_video_cmd_queue_clear(struct virtio_video *vv,
> +                                struct virtio_video_stream *stream,
> +                                uint32_t queue_type);
> +int virtio_video_query_capability(struct virtio_video *vv, void *resp_buf,
> +                                 size_t resp_size, uint32_t queue_type);
> +int virtio_video_query_control_profile(struct virtio_video *vv, void *resp_buf,
> +                                      size_t resp_size, uint32_t format);
> +int virtio_video_query_control_level(struct virtio_video *vv, void *resp_buf,
> +                                    size_t resp_size, uint32_t format);
> +int virtio_video_cmd_set_params(struct virtio_video *vv,
> +                               struct virtio_video_stream *stream,
> +                               struct video_format_info *format_info,
> +                               uint32_t queue_type);
> +int virtio_video_cmd_get_params(struct virtio_video *vv,
> +                               struct virtio_video_stream *stream,
> +                               uint32_t queue_type);
> +int virtio_video_cmd_set_control(struct virtio_video *vv,
> +                                uint32_t stream_id,
> +                                uint32_t control, uint32_t val);
> +int virtio_video_cmd_get_control(struct virtio_video *vv,
> +                                struct virtio_video_stream *stream,
> +                                uint32_t ctrl);
> +
> +void virtio_video_queue_res_chg_event(struct virtio_video_stream *stream);
> +void virtio_video_queue_eos_event(struct virtio_video_stream *stream);
> +void virtio_video_cmd_ack(struct virtqueue *vq);
> +void virtio_video_event_ack(struct virtqueue *vq);
> +void virtio_video_dequeue_cmd_func(struct work_struct *work);
> +void virtio_video_dequeue_event_func(struct work_struct *work);
> +void virtio_video_buf_done(struct virtio_video_buffer *virtio_vb,
> +                          uint32_t flags, uint64_t timestamp, uint32_t size);
> +int virtio_video_buf_plane_init(uint32_t idx, uint32_t resource_id,
> +                               struct virtio_video_device *vvd,
> +                               struct virtio_video_stream *stream,
> +                               struct vb2_buffer *vb);
> +void virtio_video_mark_drain_complete(struct virtio_video_stream *stream,
> +                                     struct vb2_v4l2_buffer *v4l2_vb);
> +
> +int virtio_video_queue_setup(struct vb2_queue *vq, unsigned int *num_buffers,
> +                            unsigned int *num_planes, unsigned int sizes[],
> +                            struct device *alloc_devs[]);
> +int virtio_video_buf_init(struct vb2_buffer *vb);
> +void virtio_video_buf_cleanup(struct vb2_buffer *vb);
> +int virtio_video_querycap(struct file *file, void *fh,
> +                         struct v4l2_capability *cap);
> +int virtio_video_enum_framesizes(struct file *file, void *fh,
> +                                struct v4l2_frmsizeenum *f);
> +int virtio_video_enum_framemintervals(struct file *file, void *fh,
> +                                     struct v4l2_frmivalenum *f);
> +int virtio_video_g_fmt(struct file *file, void *fh, struct v4l2_format *f);
> +int virtio_video_s_fmt(struct file *file, void *fh, struct v4l2_format *f);
> +int virtio_video_try_fmt(struct virtio_video_stream *stream,
> +                        struct v4l2_format *f);
> +int virtio_video_reqbufs(struct file *file, void *priv,
> +                        struct v4l2_requestbuffers *rb);
> +int virtio_video_subscribe_event(struct v4l2_fh *fh,
> +                                const struct v4l2_event_subscription *sub);
> +
> +void virtio_video_free_caps_list(struct list_head *caps_list);
> +int virtio_video_parse_virtio_capability(struct virtio_video_device *vvd,
> +                                         void *input_buf, void *output_buf);
> +void virtio_video_clean_capability(struct virtio_video_device *vvd);
> +int virtio_video_parse_virtio_control(struct virtio_video_device *vvd);
> +void virtio_video_clean_control(struct virtio_video_device *vvd);
> +
> +uint32_t virtio_video_format_to_v4l2(uint32_t format);
> +uint32_t virtio_video_control_to_v4l2(uint32_t control);
> +uint32_t virtio_video_profile_to_v4l2(uint32_t profile);
> +uint32_t virtio_video_level_to_v4l2(uint32_t level);
> +uint32_t virtio_video_v4l2_format_to_virtio(uint32_t v4l2_format);
> +uint32_t virtio_video_v4l2_control_to_virtio(uint32_t v4l2_control);
> +uint32_t virtio_video_v4l2_profile_to_virtio(uint32_t v4l2_profile);
> +uint32_t virtio_video_v4l2_level_to_virtio(uint32_t v4l2_level);
> +
> +struct video_format *find_video_format(struct list_head *fmts_list,
> +                                      uint32_t fourcc);
> +void virtio_video_format_from_info(struct video_format_info *info,
> +                                  struct v4l2_pix_format_mplane *pix_mp);
> +void virtio_video_format_fill_default_info(struct video_format_info *dst_info,
> +                                          struct video_format_info *src_info);
> +
> +int virtio_video_g_selection(struct file *file, void *fh,
> +                            struct v4l2_selection *sel);
> +int virtio_video_s_selection(struct file *file, void *fh,
> +                            struct v4l2_selection *sel);
> +
> +#endif /* _VIRTIO_VIDEO_H */
> diff --git a/drivers/media/virtio/virtio_video_caps.c b/drivers/media/virtio/virtio_video_caps.c
> new file mode 100644
> index 000000000000..2f9d4da92810
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_caps.c
> @@ -0,0 +1,498 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/* Driver for virtio video device.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-dma-sg.h>
> +
> +#include "virtio_video.h"
> +
> +static void virtio_video_free_frame_rates(struct video_format_frame *frame)
> +{
> +       if (!frame)
> +               return;
> +
> +       kfree(frame->frame_rates);
> +}
> +
> +static void virtio_video_free_frames(struct video_format *fmt)
> +{
> +       size_t idx = 0;
> +
> +       if (!fmt)
> +               return;
> +
> +       for (idx = 0; idx < fmt->desc.num_frames; idx++)
> +               virtio_video_free_frame_rates(&fmt->frames[idx]);
> +       kfree(fmt->frames);
> +}
> +
> +static void virtio_video_free_fmt(struct list_head *fmts_list)
> +{
> +       struct video_format *fmt = NULL;
> +       struct video_format *tmp = NULL;
> +
> +       list_for_each_entry_safe(fmt, tmp, fmts_list, formats_list_entry) {
> +               list_del(&fmt->formats_list_entry);
> +               virtio_video_free_frames(fmt);
> +               kfree(fmt);
> +       }
> +}
> +
> +static void virtio_video_free_fmts(struct virtio_video_device *vvd)
> +{
> +       virtio_video_free_fmt(&vvd->input_fmt_list);
> +       virtio_video_free_fmt(&vvd->output_fmt_list);
> +}
> +
> +static void assign_format_range(struct virtio_video_format_range *d_range,
> +                               struct virtio_video_format_range *s_range)
> +{
> +       d_range->min = le32_to_cpu(s_range->min);
> +       d_range->max = le32_to_cpu(s_range->max);
> +       d_range->step = le32_to_cpu(s_range->step);
> +}
> +
> +static size_t
> +virtio_video_parse_virtio_frame_rate(struct virtio_video_device *vvd,
> +                                    struct virtio_video_format_range *f_rate,
> +                                    void *buf)
> +{
> +       struct virtio_video_format_range *virtio_frame_rate = NULL;
> +       size_t frame_rate_size = sizeof(struct virtio_video_format_range);
> +
> +       if (!f_rate || !buf || !vvd)
> +               return 0;
> +
> +       virtio_frame_rate = buf;
> +       assign_format_range(f_rate, virtio_frame_rate);
> +       return frame_rate_size;
> +}
> +
> +static size_t virtio_video_parse_virtio_frame(struct virtio_video_device *vvd,
> +                                             struct video_format_frame *frm,
> +                                             void *buf)
> +{
> +       struct virtio_video *vv = NULL;
> +       struct virtio_video_format_frame *virtio_frame = NULL;
> +       struct virtio_video_format_frame *frame = &frm->frame;
> +       struct virtio_video_format_range *rate = NULL;
> +       size_t idx, offset = 0;
> +       size_t extra_size = 0;
> +
> +       if (!frame || !buf || !vvd)
> +               return 0;
> +
> +       vv = vvd->vv;
> +       virtio_frame = buf;
> +
> +       assign_format_range(&frame->width, &virtio_frame->width);
> +       assign_format_range(&frame->height, &virtio_frame->height);
> +
> +       frame->num_rates = le32_to_cpu(virtio_frame->num_rates);
> +       frm->frame_rates =  kcalloc(frame->num_rates,
> +                                   sizeof(struct virtio_video_format_range),
> +                                   GFP_KERNEL);
> +
> +       offset = sizeof(struct virtio_video_format_frame);
> +       for (idx = 0; idx < frame->num_rates; idx++) {
> +               rate = &frm->frame_rates[idx];
> +               extra_size =
> +                       virtio_video_parse_virtio_frame_rate(vvd, rate,
> +                                                            buf + offset);
> +               if (extra_size == 0) {
> +                       kfree(frm->frame_rates);
> +                       v4l2_err(&vv->v4l2_dev, "failed to parse frame rate\n");
> +                       return 0;
> +               }
> +               offset += extra_size;
> +       }
> +
> +       return offset;
> +}
> +
> +static size_t virtio_video_parse_virtio_fmt(struct virtio_video_device *vvd,
> +                                           struct video_format *fmt, void *buf)
> +{
> +       struct virtio_video *vv = NULL;
> +       struct virtio_video_format_desc *virtio_fmt_desc = NULL;
> +       struct virtio_video_format_desc *fmt_desc = NULL;
> +       struct video_format_frame *frame = NULL;
> +       size_t idx, offset = 0;
> +       size_t extra_size = 0;
> +
> +       if (!fmt || !buf || !vvd)
> +               return 0;
> +
> +       vv = vvd->vv;
> +       virtio_fmt_desc = buf;
> +       fmt_desc = &fmt->desc;
> +
> +       fmt_desc->format =
> +               virtio_video_format_to_v4l2
> +               (le32_to_cpu(virtio_fmt_desc->format));
> +       fmt_desc->mask = le64_to_cpu(virtio_fmt_desc->mask);
> +       fmt_desc->planes_layout = le32_to_cpu(virtio_fmt_desc->planes_layout);
> +
> +       fmt_desc->num_frames = le32_to_cpu(virtio_fmt_desc->num_frames);
> +       fmt->frames = kcalloc(fmt_desc->num_frames,
> +                             sizeof(struct video_format_frame),
> +                             GFP_KERNEL);
> +
> +       offset = sizeof(struct virtio_video_format_desc);
> +       for (idx = 0; idx < fmt_desc->num_frames; idx++) {
> +               frame = &fmt->frames[idx];
> +               extra_size =
> +                       virtio_video_parse_virtio_frame(vvd, frame,
> +                                                       buf + offset);
> +               if (extra_size == 0) {
> +                       kfree(fmt->frames);
> +                       v4l2_err(&vv->v4l2_dev, "failed to parse frame\n");
> +                       return 0;
> +               }
> +               offset += extra_size;
> +       }
> +
> +       return offset;
> +}
> +
> +int virtio_video_parse_virtio_capability(struct virtio_video_device *vvd,
> +                                           void *input_buf, void *output_buf)
> +{
> +       struct virtio_video *vv = NULL;
> +       struct virtio_video_query_capability_resp *input_resp = input_buf;
> +       struct virtio_video_query_capability_resp *output_resp = output_buf;
> +       int fmt_idx = 0;
> +       size_t offset = 0;
> +       struct video_format *fmt = NULL;
> +
> +       if (!input_buf || !output_buf || !vvd)
> +               return -1;
> +
> +       vv = vvd->vv;
> +
> +       if (le32_to_cpu(input_resp->num_descs) <= 0 ||
> +           le32_to_cpu(output_resp->num_descs) <= 0) {
> +               v4l2_err(&vv->v4l2_dev, "invalid capability response\n");
> +               return -1;
> +       }
> +
> +       vvd->num_input_fmts = le32_to_cpu(input_resp->num_descs);
> +       offset = sizeof(struct virtio_video_query_capability_resp);
> +
> +       for (fmt_idx = 0; fmt_idx < vvd->num_input_fmts; fmt_idx++) {
> +               size_t fmt_size = 0;
> +
> +               fmt = kzalloc(sizeof(*fmt), GFP_KERNEL);
> +               if (!fmt) {
> +                       virtio_video_free_fmts(vvd);
> +                       return -1;
> +               }
> +
> +               fmt_size = virtio_video_parse_virtio_fmt(vvd, fmt,
> +                                                        input_buf + offset);
> +               if (fmt_size == 0) {
> +                       v4l2_err(&vv->v4l2_dev, "failed to parse input fmt\n");
> +                       virtio_video_free_fmts(vvd);
> +                       kfree(fmt);
> +                       return -1;
> +               }
> +               offset += fmt_size;
> +               list_add(&fmt->formats_list_entry, &vvd->input_fmt_list);
> +       }
> +
> +       vvd->num_output_fmts = le32_to_cpu(output_resp->num_descs);
> +       offset = sizeof(struct virtio_video_query_capability_resp);
> +
> +       for (fmt_idx = 0; fmt_idx < vvd->num_output_fmts; fmt_idx++) {
> +               size_t fmt_size = 0;
> +
> +               fmt = kzalloc(sizeof(*fmt), GFP_KERNEL);
> +               if (!fmt) {
> +                       virtio_video_free_fmts(vvd);
> +                       return -1;
> +               }
> +
> +               fmt_size = virtio_video_parse_virtio_fmt(vvd, fmt,
> +                                                        output_buf + offset);
> +               if (fmt_size == 0) {
> +                       v4l2_err(&vv->v4l2_dev, "failed to parse output fmt\n");
> +                       virtio_video_free_fmts(vvd);
> +                       kfree(fmt);
> +                       return -1;
> +               }
> +               offset += fmt_size;
> +               list_add(&fmt->formats_list_entry, &vvd->output_fmt_list);
> +       }
> +       return 0;
> +}
> +
> +void virtio_video_clean_capability(struct virtio_video_device *vvd)
> +{
> +       if (!vvd)
> +               return;
> +       virtio_video_free_fmts(vvd);
> +}
> +
> +static void
> +virtio_video_free_control_fmt_data(struct video_control_fmt_data *data)
> +{
> +       if (!data)
> +               return;
> +
> +       kfree(data->entries);
> +       kfree(data);
> +}
> +
> +static void virtio_video_free_control_formats(struct virtio_video_device *vvd)
> +{
> +       struct video_control_format *c_fmt = NULL;
> +       struct video_control_format *tmp = NULL;
> +
> +       list_for_each_entry_safe(c_fmt, tmp, &vvd->controls_fmt_list,
> +                                controls_list_entry) {
> +               list_del(&c_fmt->controls_list_entry);
> +               virtio_video_free_control_fmt_data(c_fmt->profile);
> +               virtio_video_free_control_fmt_data(c_fmt->level);
> +               kfree(c_fmt);
> +       }
> +}
> +
> +static int virtio_video_parse_control_levels(struct virtio_video_device *vvd,
> +                                            struct video_control_format *fmt)
> +{
> +       int idx, ret = 0;
> +       struct virtio_video_query_control_resp *resp_buf = NULL;
> +       struct virtio_video_query_control_resp_level *l_resp_buf = NULL;
> +       struct virtio_video *vv = NULL;
> +       uint32_t virtio_format, num_levels, mask = 0;
> +       uint32_t *virtio_levels = NULL;
> +       struct video_control_fmt_data *level = NULL;
> +       int max = 0, min = UINT_MAX;
> +       size_t resp_size;
> +
> +       if (!vvd)
> +               return -EINVAL;
> +
> +       vv = vvd->vv;
> +       resp_size = vv->max_resp_len;
> +
> +       virtio_format = virtio_video_v4l2_format_to_virtio(fmt->format);
> +
> +       resp_buf = kzalloc(resp_size, GFP_KERNEL);
> +       if (IS_ERR(resp_buf)) {
> +               ret = PTR_ERR(resp_buf);
> +               goto err;
> +       }
> +
> +       vv->got_control = false;
> +       ret = virtio_video_query_control_level(vv, resp_buf, resp_size,
> +                                              virtio_format);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to query level\n");
> +               goto err;
> +       }
> +
> +       ret = wait_event_timeout(vv->wq, vv->got_control, 5 * HZ);
> +       if (ret == 0) {
> +               v4l2_err(&vv->v4l2_dev,
> +                        "timed out waiting for query level\n");
> +               ret = -EIO;
> +               goto err;
> +       }
> +
> +       ret = 0;
> +       l_resp_buf = (void *)((char *)resp_buf + sizeof(*resp_buf));
> +       num_levels = le32_to_cpu(l_resp_buf->num);
> +       if (num_levels == 0)
> +               goto err;
> +
> +       fmt->level = kzalloc(sizeof(*level), GFP_KERNEL);
> +       if (!fmt->level) {
> +               ret = -ENOMEM;
> +               goto err;
> +       }
> +
> +       level = fmt->level;
> +       level->entries = kcalloc(num_levels, sizeof(uint32_t), GFP_KERNEL);
> +       if (!level->entries) {
> +               ret = -ENOMEM;
> +               goto err;
> +       }
> +
> +       virtio_levels = (void *)((char *)l_resp_buf + sizeof(*l_resp_buf));
> +
> +       for (idx = 0; idx < num_levels; idx++) {
> +               level->entries[idx] =
> +                       virtio_video_level_to_v4l2
> +                       (le32_to_cpu(virtio_levels[idx]));
> +
> +               mask = mask | (1 << level->entries[idx]);
> +               if (level->entries[idx] > max)
> +                       max = level->entries[idx];
> +               if (level->entries[idx] < min)
> +                       min = level->entries[idx];
> +       }
> +       level->min = min;
> +       level->max = max;
> +       level->num = num_levels;
> +       level->skip_mask = ~mask;
> +err:
> +       kfree(resp_buf);
> +       return ret;
> +}
> +
> +static int virtio_video_parse_control_profiles(struct virtio_video_device *vvd,
> +                                              struct video_control_format *fmt)
> +{
> +       int idx, ret = 0;
> +       struct virtio_video_query_control_resp *resp_buf = NULL;
> +       struct virtio_video_query_control_resp_profile *p_resp_buf = NULL;
> +       struct virtio_video *vv = NULL;
> +       uint32_t virtio_format, num_profiles, mask = 0;
> +       uint32_t *virtio_profiles = NULL;
> +       struct video_control_fmt_data *profile = NULL;
> +       int max = 0, min = UINT_MAX;
> +       size_t resp_size;
> +
> +       if (!vvd)
> +               return -EINVAL;
> +
> +       vv = vvd->vv;
> +       resp_size = vv->max_resp_len;
> +       virtio_format = virtio_video_v4l2_format_to_virtio(fmt->format);
> +       resp_buf = kzalloc(resp_size, GFP_KERNEL);
> +       if (IS_ERR(resp_buf)) {
> +               ret = PTR_ERR(resp_buf);
> +               goto err;
> +       }
> +
> +       vv->got_control = false;
> +       ret = virtio_video_query_control_profile(vv, resp_buf, resp_size,
> +                                                virtio_format);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to query profile\n");
> +               goto err;
> +       }
> +
> +       ret = wait_event_timeout(vv->wq, vv->got_control, 5 * HZ);
> +       if (ret == 0) {
> +               v4l2_err(&vv->v4l2_dev,
> +                        "timed out waiting for query profile\n");
> +               ret = -EIO;
> +               goto err;
> +       }
> +
> +       ret = 0;
> +       p_resp_buf = (void *)((char *)resp_buf + sizeof(*resp_buf));
> +       num_profiles = le32_to_cpu(p_resp_buf->num);
> +       if (num_profiles == 0)
> +               goto err;
> +
> +       fmt->profile = kzalloc(sizeof(*profile), GFP_KERNEL);
> +       if (!fmt->profile) {
> +               ret = -ENOMEM;
> +               goto err;
> +       }
> +
> +       profile = fmt->profile;
> +       profile->entries = kcalloc(num_profiles, sizeof(uint32_t), GFP_KERNEL);
> +       if (!profile->entries) {
> +               ret = -ENOMEM;
> +               goto err;
> +       }
> +
> +       virtio_profiles = (void *)((char *)p_resp_buf + sizeof(*p_resp_buf));
> +
> +       for (idx = 0; idx < num_profiles; idx++) {
> +               profile->entries[idx] =
> +                       virtio_video_profile_to_v4l2
> +                       (le32_to_cpu(virtio_profiles[idx]));
> +
> +               mask = mask | (1 << profile->entries[idx]);
> +               if (profile->entries[idx] > max)
> +                       max = profile->entries[idx];
> +               if (profile->entries[idx] < min)
> +                       min = profile->entries[idx];
> +       }
> +       profile->min = min;
> +       profile->max = max;
> +       profile->num = num_profiles;
> +       profile->skip_mask = ~mask;
> +err:
> +       kfree(resp_buf);
> +       return ret;
> +}
> +
> +int virtio_video_parse_virtio_control(struct virtio_video_device *vvd)
> +{
> +       struct video_format *fmt = NULL;
> +       struct video_control_format *c_fmt = NULL;
> +       struct virtio_video *vv = NULL;
> +       uint32_t virtio_format;
> +       int ret = 0;
> +
> +       if (!vvd)
> +               return -EINVAL;
> +
> +       vv = vvd->vv;
> +
> +       list_for_each_entry(fmt, &vvd->output_fmt_list, formats_list_entry) {
> +               virtio_format =
> +                       virtio_video_v4l2_format_to_virtio(fmt->desc.format);
> +               if (virtio_format < VIRTIO_VIDEO_FORMAT_CODED_MIN ||
> +                   virtio_format > VIRTIO_VIDEO_FORMAT_CODED_MAX)
> +                       continue;
> +
> +               c_fmt = kzalloc(sizeof(*c_fmt), GFP_KERNEL);
> +               if (!c_fmt) {
> +                       virtio_video_free_control_formats(vvd);
> +                       return -1;
> +               }
> +
> +               c_fmt->format = fmt->desc.format;
> +               ret = virtio_video_parse_control_profiles(vvd, c_fmt);
> +               if (ret) {
> +                       virtio_video_free_control_formats(vvd);
> +                       kfree(c_fmt);
> +                       v4l2_err(&vv->v4l2_dev,
> +                                "failed to parse control profile\n");
> +                       goto err;
> +               }
> +               ret = virtio_video_parse_control_levels(vvd, c_fmt);
> +               if (ret) {
> +                       virtio_video_free_control_formats(vvd);
> +                       kfree(c_fmt);
> +                       v4l2_err(&vv->v4l2_dev,
> +                                "failed to parse control level\n");
> +                       goto err;
> +               }
> +               list_add(&c_fmt->controls_list_entry, &vvd->controls_fmt_list);
> +       }
> +       return 0;
> +err:
> +       return ret;
> +}
> +
> +void virtio_video_clean_control(struct virtio_video_device *vvd)
> +{
> +       if (!vvd)
> +               return;
> +
> +       virtio_video_free_control_formats(vvd);
> +}
> diff --git a/drivers/media/virtio/virtio_video_dec.c b/drivers/media/virtio/virtio_video_dec.c
> new file mode 100644
> index 000000000000..fc805933fc5e
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_dec.c
> @@ -0,0 +1,427 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/* Decoder for virtio video device.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +
> +#include "virtio_video.h"
> +
> +static void virtio_video_dec_buf_queue(struct vb2_buffer *vb)
> +{
> +       int i, ret;
> +       struct vb2_buffer *src_buf;
> +       struct vb2_v4l2_buffer *src_vb;
> +       struct virtio_video_buffer *virtio_vb;
> +       uint32_t data_size[VB2_MAX_PLANES] = {0};
> +       struct vb2_v4l2_buffer *v4l2_vb = to_vb2_v4l2_buffer(vb);
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vb->vb2_queue);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       v4l2_m2m_buf_queue(stream->fh.m2m_ctx, v4l2_vb);
> +
> +       if ((stream->state != STREAM_STATE_INIT) ||
> +           !V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type))
> +               return;
> +
> +       src_vb = v4l2_m2m_next_src_buf(stream->fh.m2m_ctx);
> +       if (!src_vb) {
> +               v4l2_err(&vv->v4l2_dev, "no src buf during initialization\n");
> +               return;
> +       }
> +
> +       src_buf = &src_vb->vb2_buf;
> +       for (i = 0; i < src_buf->num_planes; ++i)
> +               data_size[i] = src_buf->planes[i].bytesused;
> +
> +       virtio_vb = to_virtio_vb(src_buf);
> +
> +       ret = virtio_video_cmd_resource_queue(vv, stream->stream_id,
> +                                             virtio_vb, data_size,
> +                                             src_buf->num_planes,
> +                                             VIRTIO_VIDEO_QUEUE_TYPE_INPUT);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to queue an src buffer\n");
> +               return;
> +       }
> +
> +       virtio_vb->queued = true;
> +       stream->src_cleared = false;
> +       src_vb = v4l2_m2m_src_buf_remove(stream->fh.m2m_ctx);
> +}
> +
> +static int virtio_video_dec_start_streaming(struct vb2_queue *vq,
> +                                           unsigned int count)
> +{
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vq);
> +
> +       if (!V4L2_TYPE_IS_OUTPUT(vq->type) &&
> +           stream->state >= STREAM_STATE_INIT)
> +               stream->state = STREAM_STATE_RUNNING;
> +
> +       return 0;
> +}
> +
> +static void virtio_video_dec_stop_streaming(struct vb2_queue *vq)
> +{
> +       int ret, queue_type;
> +       bool *cleared;
> +       bool is_v4l2_output = V4L2_TYPE_IS_OUTPUT(vq->type);
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vq);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct vb2_v4l2_buffer *v4l2_vb;
> +
> +       if (is_v4l2_output) {
> +               cleared = &stream->src_cleared;
> +               queue_type = VIRTIO_VIDEO_QUEUE_TYPE_INPUT;
> +       } else {
> +               cleared = &stream->dst_cleared;
> +               queue_type = VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT;
> +       }
> +
> +       ret = virtio_video_cmd_queue_clear(vv, stream, queue_type);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to clear queue\n");
> +               return;
> +       }
> +
> +       ret = wait_event_timeout(vv->wq, *cleared, 5 * HZ);
> +       if (ret == 0) {
> +               v4l2_err(&vv->v4l2_dev, "timed out waiting for queue clear\n");
> +               return;
> +       }
> +
> +       for (;;) {
> +               if (is_v4l2_output)
> +                       v4l2_vb = v4l2_m2m_src_buf_remove(stream->fh.m2m_ctx);
> +               else
> +                       v4l2_vb = v4l2_m2m_dst_buf_remove(stream->fh.m2m_ctx);
> +               if (!v4l2_vb)
> +                       break;
> +               v4l2_m2m_buf_done(v4l2_vb, VB2_BUF_STATE_ERROR);
> +       }
> +}
> +
> +static const struct vb2_ops virtio_video_dec_qops = {
> +       .queue_setup     = virtio_video_queue_setup,
> +       .buf_init        = virtio_video_buf_init,
> +       .buf_cleanup     = virtio_video_buf_cleanup,
> +       .buf_queue       = virtio_video_dec_buf_queue,
> +       .start_streaming = virtio_video_dec_start_streaming,
> +       .stop_streaming  = virtio_video_dec_stop_streaming,
> +       .wait_prepare    = vb2_ops_wait_prepare,
> +       .wait_finish     = vb2_ops_wait_finish,
> +};
> +
> +static int virtio_video_dec_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +       int ret = 0;
> +       struct virtio_video_stream *stream = ctrl2stream(ctrl);
> +
> +       switch (ctrl->id) {
> +       case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
> +               if (stream->state >= STREAM_STATE_METADATA)
> +                       ctrl->val = stream->out_info.min_buffers;
> +               else
> +                       ctrl->val = 0;
> +               break;
> +       default:
> +               ret = -EINVAL;
> +       }
> +
> +       return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops virtio_video_dec_ctrl_ops = {
> +       .g_volatile_ctrl        = virtio_video_dec_g_volatile_ctrl,
> +};
> +
> +int virtio_video_dec_init_ctrls(struct virtio_video_stream *stream)
> +{
> +       struct v4l2_ctrl *ctrl;
> +
> +       v4l2_ctrl_handler_init(&stream->ctrl_handler, 1);
> +
> +       ctrl = v4l2_ctrl_new_std(&stream->ctrl_handler,
> +                               &virtio_video_dec_ctrl_ops,
> +                               V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
> +                               MIN_BUFS_MIN, MIN_BUFS_MAX, MIN_BUFS_STEP,
> +                               MIN_BUFS_DEF);
> +       ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
> +
> +       if (stream->ctrl_handler.error)
> +               return stream->ctrl_handler.error;
> +
> +       v4l2_ctrl_handler_setup(&stream->ctrl_handler);
> +
> +       return 0;
> +}
> +
> +int virtio_video_dec_init_queues(void *priv, struct vb2_queue *src_vq,
> +                                struct vb2_queue *dst_vq)
> +{
> +       int ret;
> +       struct virtio_video_stream *stream = priv;
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct device *dev = vv->v4l2_dev.dev;
> +
> +       src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +       src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +       src_vq->drv_priv = stream;
> +       src_vq->buf_struct_size = sizeof(struct virtio_video_buffer);
> +       src_vq->ops = &virtio_video_dec_qops;
> +       src_vq->mem_ops = virtio_video_mem_ops(vv);
> +       src_vq->min_buffers_needed = stream->in_info.min_buffers;
> +       src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +       src_vq->lock = &stream->vq_mutex;
> +       src_vq->gfp_flags = virtio_video_gfp_flags(vv);
> +       src_vq->dev = dev;
> +
> +       ret = vb2_queue_init(src_vq);
> +       if (ret)
> +               return ret;
> +
> +       dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +       dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +       dst_vq->drv_priv = stream;
> +       dst_vq->buf_struct_size = sizeof(struct virtio_video_buffer);
> +       dst_vq->ops = &virtio_video_dec_qops;
> +       dst_vq->mem_ops = virtio_video_mem_ops(vv);
> +       dst_vq->min_buffers_needed = stream->out_info.min_buffers;
> +       dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +       dst_vq->lock = &stream->vq_mutex;
> +       dst_vq->gfp_flags = virtio_video_gfp_flags(vv);
> +       dst_vq->dev = dev;
> +
> +       return vb2_queue_init(dst_vq);
> +}
> +
> +static int virtio_video_try_decoder_cmd(struct file *file, void *fh,
> +                                       struct v4l2_decoder_cmd *cmd)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       if (stream->state == STREAM_STATE_DRAIN)
> +               return -EBUSY;
> +
> +       switch (cmd->cmd) {
> +       case V4L2_DEC_CMD_STOP:
> +       case V4L2_DEC_CMD_START:
> +               if (cmd->flags != 0) {
> +                       v4l2_err(&vv->v4l2_dev, "flags=%u are not supported",
> +                                cmd->flags);
> +                       return -EINVAL;
> +               }
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static int virtio_video_decoder_cmd(struct file *file, void *fh,
> +                                   struct v4l2_decoder_cmd *cmd)
> +{
> +       int ret;
> +       struct vb2_queue *src_vq, *dst_vq;
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       ret = virtio_video_try_decoder_cmd(file, fh, cmd);
> +       if (ret < 0)
> +               return ret;
> +
> +       dst_vq = v4l2_m2m_get_vq(stream->fh.m2m_ctx,
> +                                V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +
> +       switch (cmd->cmd) {
> +       case V4L2_DEC_CMD_START:
> +               vb2_clear_last_buffer_dequeued(dst_vq);
> +               break;
> +       case V4L2_DEC_CMD_STOP:
> +               src_vq = v4l2_m2m_get_vq(stream->fh.m2m_ctx,
> +                                        V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> +
> +               if (!vb2_is_streaming(src_vq)) {
> +                       v4l2_dbg(1, vv->debug,
> +                                &vv->v4l2_dev, "output is not streaming\n");
> +                       return 0;
> +               }
> +
> +               if (!vb2_is_streaming(dst_vq)) {
> +                       v4l2_dbg(1, vv->debug,
> +                                &vv->v4l2_dev, "capture is not streaming\n");
> +                       return 0;
> +               }
> +
> +               ret = virtio_video_cmd_stream_drain(vv, stream->stream_id);
> +               if (ret) {
> +                       v4l2_err(&vv->v4l2_dev, "failed to drain stream\n");
> +                       return ret;
> +               }
> +
> +               stream->state = STREAM_STATE_DRAIN;
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static int virtio_video_dec_enum_fmt_vid_cap(struct file *file, void *fh,
> +                                            struct v4l2_fmtdesc *f)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format_info *info = NULL;
> +       struct video_format *fmt = NULL;
> +       unsigned long input_mask = 0;
> +       int idx = 0, bit_num = 0;
> +
> +       if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +               return -EINVAL;
> +
> +       if (f->index >= vvd->num_output_fmts)
> +               return -EINVAL;
> +
> +       info = &stream->in_info;
> +       list_for_each_entry(fmt, &vvd->input_fmt_list, formats_list_entry) {
> +               if (info->fourcc_format == fmt->desc.format) {
> +                       input_mask = fmt->desc.mask;
> +                       break;
> +               }
> +       }
> +
> +       if (input_mask == 0)
> +               return -EINVAL;
> +
> +       list_for_each_entry(fmt, &vvd->output_fmt_list, formats_list_entry) {
> +               if (test_bit(bit_num, &input_mask)) {
> +                       if (f->index == idx) {
> +                               f->pixelformat = fmt->desc.format;
> +                               return 0;
> +                       }
> +                       idx++;
> +               }
> +               bit_num++;
> +       }
> +       return -EINVAL;
> +}
> +
> +
> +int virtio_video_dec_enum_fmt_vid_out(struct file *file, void *fh,
> +                                     struct v4l2_fmtdesc *f)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format *fmt = NULL;
> +       int idx = 0;
> +
> +       if (f->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +               return -EINVAL;
> +
> +       if (f->index >= vvd->num_input_fmts)
> +               return -EINVAL;
> +
> +       list_for_each_entry(fmt, &vvd->input_fmt_list, formats_list_entry) {
> +               if (f->index == idx) {
> +                       f->pixelformat = fmt->desc.format;
> +                       return 0;
> +               }
> +               idx++;
> +       }
> +       return -EINVAL;
> +}
> +
> +static int virtio_video_dec_s_fmt(struct file *file, void *fh,
> +                                 struct v4l2_format *f)
> +{
> +       int ret;
> +       struct virtio_video_stream *stream = file2stream(file);
> +
> +       ret = virtio_video_s_fmt(file, fh, f);
> +       if (ret)
> +               return ret;
> +
> +       if (V4L2_TYPE_IS_OUTPUT(f->type)) {
> +               if (stream->state == STREAM_STATE_IDLE)
> +                       stream->state = STREAM_STATE_INIT;
> +       }
> +
> +       return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops virtio_video_dec_ioctl_ops = {
> +       .vidioc_querycap        = virtio_video_querycap,
> +
> +       .vidioc_enum_fmt_vid_cap = virtio_video_dec_enum_fmt_vid_cap,
> +       .vidioc_g_fmt_vid_cap   = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_cap   = virtio_video_dec_s_fmt,
> +
> +       .vidioc_enum_fmt_vid_cap_mplane = virtio_video_dec_enum_fmt_vid_cap,
> +       .vidioc_g_fmt_vid_cap_mplane    = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_cap_mplane    = virtio_video_dec_s_fmt,
> +
> +       .vidioc_enum_fmt_vid_out = virtio_video_dec_enum_fmt_vid_out,
> +       .vidioc_g_fmt_vid_out   = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_out   = virtio_video_dec_s_fmt,
> +
> +       .vidioc_enum_fmt_vid_out_mplane = virtio_video_dec_enum_fmt_vid_out,
> +       .vidioc_g_fmt_vid_out_mplane    = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_out_mplane    = virtio_video_dec_s_fmt,
> +
> +       .vidioc_g_selection = virtio_video_g_selection,
> +       .vidioc_s_selection = virtio_video_s_selection,
> +
> +       .vidioc_try_decoder_cmd = virtio_video_try_decoder_cmd,
> +       .vidioc_decoder_cmd     = virtio_video_decoder_cmd,
> +       .vidioc_enum_frameintervals = virtio_video_enum_framemintervals,
> +       .vidioc_enum_framesizes = virtio_video_enum_framesizes,
> +
> +       .vidioc_reqbufs         = virtio_video_reqbufs,
> +       .vidioc_querybuf        = v4l2_m2m_ioctl_querybuf,
> +       .vidioc_qbuf            = v4l2_m2m_ioctl_qbuf,
> +       .vidioc_dqbuf           = v4l2_m2m_ioctl_dqbuf,
> +       .vidioc_prepare_buf     = v4l2_m2m_ioctl_prepare_buf,
> +       .vidioc_create_bufs     = v4l2_m2m_ioctl_create_bufs,
> +       .vidioc_expbuf          = v4l2_m2m_ioctl_expbuf,
> +
> +       .vidioc_streamon        = v4l2_m2m_ioctl_streamon,
> +       .vidioc_streamoff       = v4l2_m2m_ioctl_streamoff,
> +
> +       .vidioc_subscribe_event = virtio_video_subscribe_event,
> +       .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +int virtio_video_dec_init(struct video_device *vd)
> +{
> +       ssize_t num;
> +
> +       vd->ioctl_ops = &virtio_video_dec_ioctl_ops;
> +       num = strscpy(vd->name, "stateful-decoder", sizeof(vd->name));
> +
> +       return 0;
> +}
> diff --git a/drivers/media/virtio/virtio_video_dec.h b/drivers/media/virtio/virtio_video_dec.h
> new file mode 100644
> index 000000000000..0a1252248bbf
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_dec.h
> @@ -0,0 +1,30 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/* Decoder header for virtio video driver.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _VIRTIO_VIDEO_DEC_H
> +#define _VIRTIO_VIDEO_DEC_H
> +
> +#include "virtio_video.h"
> +
> +int virtio_video_dec_init(struct video_device *vd);
> +int virtio_video_dec_init_ctrls(struct virtio_video_stream *stream);
> +int virtio_video_dec_init_queues(void *priv, struct vb2_queue *src_vq,
> +                                struct vb2_queue *dst_vq);
> +
> +#endif /* _VIRTIO_VIDEO_DEC_H */
> diff --git a/drivers/media/virtio/virtio_video_device.c b/drivers/media/virtio/virtio_video_device.c
> new file mode 100644
> index 000000000000..130e705580d1
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_device.c
> @@ -0,0 +1,1079 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/* Driver for virtio video device.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-dma-sg.h>
> +
> +#include "virtio_video.h"
> +#include "virtio_video_dec.h"
> +#include "virtio_video_enc.h"
> +
> +int virtio_video_queue_setup(struct vb2_queue *vq, unsigned int *num_buffers,
> +                            unsigned int *num_planes, unsigned int sizes[],
> +                            struct device *alloc_devs[])
> +{
> +       int i;
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vq);
> +       struct video_format_info *p_info;
> +
> +       if (*num_planes)
> +               return 0;
> +
> +       if (V4L2_TYPE_IS_OUTPUT(vq->type))
> +               p_info = &stream->in_info;
> +       else
> +               p_info = &stream->out_info;
> +
> +       *num_planes = p_info->num_planes;
> +
> +       for (i = 0; i < p_info->num_planes; i++)
> +               sizes[i] = p_info->plane_format[i].plane_size;
> +
> +       return 0;
> +}
> +
> +int virtio_video_buf_init(struct vb2_buffer *vb)
> +{
> +       int ret = 0;
> +       unsigned int i, j;
> +       struct scatterlist *sg;
> +       struct virtio_video_mem_entry *ents;
> +       uint32_t num_ents[VIRTIO_VIDEO_MAX_PLANES];
> +       struct sg_table *sgt[VIRTIO_VIDEO_MAX_PLANES];
> +       uint32_t resource_id, nents = 0;
> +       struct vb2_queue *vq = vb->vb2_queue;
> +       enum v4l2_buf_type queue_type = vq->type;
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vq);
> +       struct virtio_video_buffer *virtio_vb = to_virtio_vb(vb);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       virtio_video_resource_id_get(vv, &resource_id);
> +
> +       if (vv->supp_non_contig) {
> +               for (i = 0; i < vb->num_planes; i++) {
> +                       sgt[i] = vb2_dma_sg_plane_desc(vb, i);
> +                       nents += sgt[i]->nents;
> +               }
> +
> +               ents = kcalloc(nents, sizeof(*ents), GFP_KERNEL);
> +               if (!ents)
> +                       return -ENOMEM;
> +
> +               for (i = 0; i < vb->num_planes; ++i) {
> +                       for_each_sg(sgt[i]->sgl, sg, sgt[i]->nents, j) {
> +                               ents[j].addr = cpu_to_le64(vv->has_iommu
> +                                                          ? sg_dma_address(sg)
> +                                                          : sg_phys(sg));
> +                               ents[j].length = cpu_to_le32(sg->length);
> +                       }
> +                       num_ents[i] = sgt[i]->nents;
> +               }
> +       } else {
> +               nents = vb->num_planes;
> +
> +               ents = kcalloc(nents, sizeof(*ents), GFP_KERNEL);
> +               if (!ents)
> +                       return -ENOMEM;
> +
> +               for (i = 0; i < vb->num_planes; ++i) {
> +                       ents[i].addr =
> +                               cpu_to_le64(vb2_dma_contig_plane_dma_addr(vb,
> +                                                                         i));
> +                       ents[i].length = cpu_to_le32(vb->planes[i].length);
> +                       num_ents[i] = 1;
> +               }
> +       }
> +
> +       v4l2_dbg(1, vv->debug, &vv->v4l2_dev, "mem entries:\n");
> +       if (vv->debug >= 1) {
> +               for (i = 0; i < nents; i++)
> +                       pr_debug("\t%03i: addr=%llx length=%u\n", i,
> +                                       ents[i].addr, ents[i].length);
> +       }
> +
> +       ret = virtio_video_cmd_resource_create(vv, stream->stream_id,
> +                                              resource_id,
> +                                              to_virtio_queue_type(queue_type),
> +                                              ents, vb->num_planes,
> +                                              num_ents);
> +       if (ret) {
> +               virtio_video_resource_id_put(vvd->vv, resource_id);
> +               kfree(ents);
> +
> +               return ret;
> +       }
> +
> +       virtio_vb->queued = false;
> +       virtio_vb->resource_id = resource_id;
> +
> +       return 0;
> +}
> +
> +void virtio_video_buf_cleanup(struct vb2_buffer *vb)
> +{
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vb->vb2_queue);
> +       struct virtio_video_buffer *virtio_vb = to_virtio_vb(vb);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       virtio_video_resource_id_put(vv, virtio_vb->resource_id);
> +}
> +
> +int virtio_video_querycap(struct file *file, void *fh,
> +                         struct v4l2_capability *cap)
> +{
> +       struct video_device *video_dev = video_devdata(file);
> +
> +       strncpy(cap->driver, DRIVER_NAME, sizeof(cap->driver));
> +       strncpy(cap->card, video_dev->name, sizeof(cap->card));
> +       snprintf(cap->bus_info, sizeof(cap->bus_info), "virtio:%s",
> +                video_dev->name);
> +
> +       cap->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
> +       cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> +
> +       return 0;
> +}
> +
> +int virtio_video_enum_framesizes(struct file *file, void *fh,
> +                                struct v4l2_frmsizeenum *f)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format *fmt = NULL;
> +       struct video_format_frame *frm = NULL;
> +       struct virtio_video_format_frame *frame = NULL;
> +       int idx = f->index;
> +
> +       fmt = find_video_format(&vvd->input_fmt_list, f->pixel_format);
> +       if (fmt == NULL)
> +               fmt = find_video_format(&vvd->output_fmt_list, f->pixel_format);
> +       if (fmt == NULL)
> +               return -EINVAL;
> +
> +       if (idx >= fmt->desc.num_frames)
> +               return -EINVAL;
> +
> +       frm = &fmt->frames[idx];
> +       frame = &frm->frame;
> +
> +       if (frame->width.min == frame->width.max &&
> +           frame->height.min == frame->height.max) {
> +               f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
> +               f->discrete.width = frame->width.min;
> +               f->discrete.height = frame->height.min;
> +               return 0;
> +       }
> +
> +       f->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
> +       f->stepwise.min_width = frame->width.min;
> +       f->stepwise.max_width = frame->width.max;
> +       f->stepwise.min_height = frame->height.min;
> +       f->stepwise.max_height = frame->height.max;
> +       f->stepwise.step_width = frame->width.step;
> +       f->stepwise.step_height = frame->height.step;
> +       return 0;
> +}
> +
> +static bool in_stepped_interval(uint32_t int_start, uint32_t int_end,
> +                               uint32_t step, uint32_t point)
> +{
> +       if (point < int_start || point > int_end)
> +               return false;
> +
> +       if (step == 0 && int_start == int_end && int_start == point)
> +               return true;
> +
> +       if (step != 0 && (point - int_start) % step == 0)
> +               return true;
> +
> +       return false;
> +}
> +
> +int virtio_video_enum_framemintervals(struct file *file, void *fh,
> +                                     struct v4l2_frmivalenum *f)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format *fmt = NULL;
> +       struct video_format_frame *frm = NULL;
> +       struct virtio_video_format_frame *frame = NULL;
> +       struct virtio_video_format_range *frate = NULL;
> +       int idx = f->index;
> +       int f_idx = 0;
> +
> +       fmt = find_video_format(&vvd->input_fmt_list, f->pixel_format);
> +       if (fmt == NULL)
> +               fmt = find_video_format(&vvd->output_fmt_list, f->pixel_format);
> +       if (fmt == NULL)
> +               return -EINVAL;
> +
> +       for (f_idx = 0; f_idx <= fmt->desc.num_frames; f_idx++) {
> +               frm = &fmt->frames[f_idx];
> +               frame = &frm->frame;
> +               if (in_stepped_interval(frame->width.min, frame->width.max,
> +                                       frame->width.step, f->width) &&
> +                  in_stepped_interval(frame->height.min, frame->height.max,
> +                                       frame->height.step, f->height))
> +                       break;
> +       }
> +
> +       if (frame == NULL || f->index >= frame->num_rates)
> +               return -EINVAL;
> +
> +       frate = &frm->frame_rates[idx];
> +       if (frate->max == frate->min) {
> +               f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
> +               f->discrete.numerator = 1;
> +               f->discrete.denominator = frate->max;
> +       } else {
> +               f->stepwise.min.numerator = 1;
> +               f->stepwise.min.denominator = frate->max;
> +               f->stepwise.max.numerator = 1;
> +               f->stepwise.max.denominator = frate->min;
> +               f->stepwise.step.numerator = 1;
> +               f->stepwise.step.denominator = frate->step;
> +               if (frate->step == 1)
> +                       f->type = V4L2_FRMIVAL_TYPE_CONTINUOUS;
> +               else
> +                       f->type = V4L2_FRMIVAL_TYPE_STEPWISE;
> +       }
> +       return 0;
> +}
> +
> +
> +int virtio_video_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +       struct video_format_info *info;
> +       struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> +       struct virtio_video_stream *stream = file2stream(file);
> +
> +       if (!V4L2_TYPE_IS_OUTPUT(f->type))
> +               info = &stream->out_info;
> +       else
> +               info = &stream->in_info;
> +
> +       virtio_video_format_from_info(info, pix_mp);
> +
> +       return 0;
> +}
> +
> +int virtio_video_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +       int i, ret;
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct video_format_info info;
> +       struct video_format_info *p_info;
> +       uint32_t queue;
> +
> +       ret = virtio_video_try_fmt(stream, f);
> +       if (ret)
> +               return ret;
> +
> +       if (V4L2_TYPE_IS_OUTPUT(f->type)) {
> +               virtio_video_format_fill_default_info(&info, &stream->in_info);
> +               queue = VIRTIO_VIDEO_QUEUE_TYPE_INPUT;
> +       } else {
> +               virtio_video_format_fill_default_info(&info, &stream->out_info);
> +               queue = VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT;
> +       }
> +
> +       info.frame_width = pix_mp->width;
> +       info.frame_height = pix_mp->height;
> +       info.num_planes = pix_mp->num_planes;
> +       info.fourcc_format = pix_mp->pixelformat;
> +
> +       for (i = 0; i < info.num_planes; i++) {
> +               info.plane_format[i].stride =
> +                                        pix_mp->plane_fmt[i].bytesperline;
> +               info.plane_format[i].plane_size =
> +                                        pix_mp->plane_fmt[i].sizeimage;
> +       }
> +
> +       virtio_video_cmd_set_params(vv, stream, &info, queue);
> +       virtio_video_cmd_get_params(vv, stream, VIRTIO_VIDEO_QUEUE_TYPE_INPUT);
> +       virtio_video_cmd_get_params(vv, stream, VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +
> +       if (V4L2_TYPE_IS_OUTPUT(f->type))
> +               p_info = &stream->in_info;
> +       else
> +               p_info = &stream->out_info;
> +
> +       virtio_video_format_from_info(p_info, pix_mp);
> +
> +       return 0;
> +}
> +
> +int virtio_video_g_selection(struct file *file, void *fh,
> +                        struct v4l2_selection *sel)
> +{
> +       struct video_format_info *info = NULL;
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +
> +       switch (vvd->type) {
> +       case VIRTIO_VIDEO_DEVICE_ENCODER:
> +               if (!V4L2_TYPE_IS_OUTPUT(sel->type))
> +                       return -EINVAL;
> +               info = &stream->in_info;
> +               break;
> +       case VIRTIO_VIDEO_DEVICE_DECODER:
> +               if (V4L2_TYPE_IS_OUTPUT(sel->type))
> +                       return -EINVAL;
> +               info = &stream->out_info;
> +               break;
> +       default:
> +               v4l2_err(&vvd->vv->v4l2_dev, "unsupported device type\n");
> +               return -EINVAL;
> +       }
> +
> +       switch (sel->target) {
> +       case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> +       case V4L2_SEL_TGT_COMPOSE_PADDED:
> +               sel->r.width = info->frame_width;
> +               sel->r.height = info->frame_height;
> +               break;
> +       default:
> +               v4l2_dbg(1, vvd->vv->debug, &vvd->vv->v4l2_dev,
> +                        "unsupported/invalid selection target\n");
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +int virtio_video_s_selection(struct file *file, void *fh,
> +                            struct v4l2_selection *sel)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       int ret;
> +
> +       stream->out_info.crop.top = sel->r.top;
> +       stream->out_info.crop.left = sel->r.left;
> +       stream->out_info.crop.width = sel->r.width;
> +       stream->out_info.crop.height = sel->r.height;
> +
> +       ret = virtio_video_cmd_set_params(vv, stream,  &stream->out_info,
> +                                          VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +       if (ret < 0)
> +               return -EINVAL;
> +
> +       /* Get actual selection that was set */
> +       return virtio_video_cmd_get_params(vv, stream,
> +                                          VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +}
> +
> +int virtio_video_try_fmt(struct virtio_video_stream *stream,
> +                        struct v4l2_format *f)
> +{
> +       int i, idx = 0;
> +       struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format *fmt = NULL;
> +       bool found = false;
> +       struct video_format_frame *frm = NULL;
> +       struct virtio_video_format_frame *frame = NULL;
> +
> +       if (V4L2_TYPE_IS_OUTPUT(f->type))
> +               fmt = find_video_format(&vvd->input_fmt_list,
> +                                       pix_mp->pixelformat);
> +       else
> +               fmt = find_video_format(&vvd->output_fmt_list,
> +                                       pix_mp->pixelformat);
> +
> +       if (!fmt) {
> +               if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +                       virtio_video_format_from_info(&stream->out_info,
> +                                                     pix_mp);
> +               else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +                       virtio_video_format_from_info(&stream->in_info,
> +                                                     pix_mp);
> +               else
> +                       return -EINVAL;
> +               return 0;
> +       }
> +
> +       for (i = 0; i < fmt->desc.num_frames && !found; i++) {
> +               frm = &fmt->frames[i];
> +               frame = &frm->frame;
> +               if (!within_range(frame->width.min, pix_mp->width,
> +                                 frame->width.max))
> +                       continue;
> +
> +               if (!within_range(frame->height.min, pix_mp->width,
> +                                 frame->height.max))
> +                       continue;
> +               idx = i;
> +               /*
> +                * Try to find a more suitable frame size. Go with the current
> +                * one otherwise.
> +                */
> +               if (needs_alignment(pix_mp->width, frame->width.step))
> +                       continue;
> +
> +               if (needs_alignment(pix_mp->height, frame->height.step))
> +                       continue;
> +
> +               stream->current_frame = frm;
> +               found = true;
> +       }
> +
> +       if (!found) {
> +               frm = &fmt->frames[idx];
> +               frame = &frm->frame;
> +               pix_mp->width = clamp(pix_mp->width, frame->width.min,
> +                                     frame->width.max);
> +               if (frame->width.step != 0)
> +                       pix_mp->width = ALIGN(pix_mp->width, frame->width.step);
> +
> +               pix_mp->height = clamp(pix_mp->height, frame->height.min,
> +                                      frame->height.max);
> +               if (frame->height.step != 0)
> +                       pix_mp->height = ALIGN(pix_mp->height,
> +                                              frame->height.step);
> +               stream->current_frame = frm;
> +       }
> +
> +       return 0;
> +}
> +
> +static int virtio_video_queue_free(struct virtio_video *vv,
> +                         struct virtio_video_stream *stream,
> +                         enum v4l2_buf_type type)
> +{
> +       int ret;
> +       uint32_t queue_type = to_virtio_queue_type(type);
> +
> +       ret = virtio_video_cmd_resource_destroy_all(vv, stream,
> +                                                   queue_type);
> +       if (ret)
> +               v4l2_warn(&vv->v4l2_dev,
> +                         "failed to destroy resources\n");
> +
> +       return 0;
> +}
> +
> +int virtio_video_reqbufs(struct file *file, void *priv,
> +                        struct v4l2_requestbuffers *rb)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct v4l2_m2m_ctx *m2m_ctx = stream->fh.m2m_ctx;
> +       struct vb2_queue *vq = v4l2_m2m_get_vq(m2m_ctx, rb->type);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +
> +       if (rb->count == 0)
> +               virtio_video_queue_free(vvd->vv, stream, vq->type);
> +
> +       return v4l2_m2m_reqbufs(file, m2m_ctx, rb);
> +}
> +
> +int virtio_video_subscribe_event(struct v4l2_fh *fh,
> +                                const struct v4l2_event_subscription *sub)
> +{
> +       switch (sub->type) {
> +       case V4L2_EVENT_SOURCE_CHANGE:
> +               return v4l2_src_change_event_subscribe(fh, sub);
> +       default:
> +               return -EINVAL;
> +       }
> +}
> +
> +void virtio_video_queue_eos_event(struct virtio_video_stream *stream)
> +{
> +       static const struct v4l2_event eos_event = {
> +               .type = V4L2_EVENT_EOS
> +       };
> +
> +       v4l2_event_queue_fh(&stream->fh, &eos_event);
> +}
> +
> +void virtio_video_queue_res_chg_event(struct virtio_video_stream *stream)
> +{
> +       static const struct v4l2_event ev_src_ch = {
> +               .type = V4L2_EVENT_SOURCE_CHANGE,
> +               .u.src_change.changes =
> +                       V4L2_EVENT_SRC_CH_RESOLUTION,
> +       };
> +
> +       v4l2_event_queue_fh(&stream->fh, &ev_src_ch);
> +}
> +
> +void virtio_video_mark_drain_complete(struct virtio_video_stream *stream,
> +                                     struct vb2_v4l2_buffer *v4l2_vb)
> +{
> +       struct vb2_buffer *vb2_buf;
> +
> +       v4l2_vb->flags |= V4L2_BUF_FLAG_LAST;
> +
> +       vb2_buf = &v4l2_vb->vb2_buf;
> +       vb2_buf->planes[0].bytesused = 0;
> +
> +       v4l2_m2m_buf_done(v4l2_vb, VB2_BUF_STATE_DONE);
> +       stream->state = STREAM_STATE_STOPPED;
> +}
> +
> +void virtio_video_buf_done(struct virtio_video_buffer *virtio_vb,
> +                          uint32_t flags, uint64_t timestamp, uint32_t size)
> +{
> +       int i;
> +       enum vb2_buffer_state done_state = VB2_BUF_STATE_DONE;
> +       struct vb2_v4l2_buffer *v4l2_vb = &virtio_vb->v4l2_m2m_vb.vb;
> +       struct vb2_buffer *vb = &v4l2_vb->vb2_buf;
> +       struct vb2_queue *vb2_queue = vb->vb2_queue;
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vb2_queue);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format_info *p_info;
> +
> +       virtio_vb->queued = false;
> +
> +       if (flags & VIRTIO_VIDEO_BUFFER_FLAG_ERR)
> +               done_state = VB2_BUF_STATE_ERROR;
> +
> +       if (flags & VIRTIO_VIDEO_BUFFER_FLAG_IFRAME)
> +               v4l2_vb->flags |= V4L2_BUF_FLAG_KEYFRAME;
> +
> +       if (flags & VIRTIO_VIDEO_BUFFER_FLAG_BFRAME)
> +               v4l2_vb->flags |= V4L2_BUF_FLAG_BFRAME;
> +
> +       if (flags & VIRTIO_VIDEO_BUFFER_FLAG_PFRAME)
> +               v4l2_vb->flags |= V4L2_BUF_FLAG_PFRAME;
> +
> +       if (flags & VIRTIO_VIDEO_BUFFER_FLAG_EOS) {
> +               v4l2_vb->flags |= V4L2_BUF_FLAG_LAST;
> +               stream->state = STREAM_STATE_STOPPED;
> +               virtio_video_queue_eos_event(stream);
> +       }
> +
> +       if (!V4L2_TYPE_IS_OUTPUT(vb2_queue->type)) {
> +               switch (vvd->type) {
> +               case VIRTIO_VIDEO_DEVICE_ENCODER:
> +                       vb->planes[0].bytesused = size;
> +                       break;
> +               case VIRTIO_VIDEO_DEVICE_DECODER:
> +                       p_info = &stream->out_info;
> +                       for (i = 0; i < p_info->num_planes; i++)
> +                               vb->planes[i].bytesused =
> +                                       p_info->plane_format[i].plane_size;
> +                       break;
> +               }
> +
> +               vb->timestamp = timestamp;
> +       }
> +
> +       v4l2_m2m_buf_done(v4l2_vb, done_state);
> +}
> +
> +static void virtio_video_worker(struct work_struct *work)
> +{
> +       unsigned int i;
> +       int ret;
> +       struct vb2_buffer *vb2_buf;
> +       struct vb2_v4l2_buffer *src_vb, *dst_vb;
> +       struct virtio_video_buffer *virtio_vb;
> +       struct virtio_video_stream *stream = work2stream(work);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct vb2_queue *src_vq =
> +               v4l2_m2m_get_vq(stream->fh.m2m_ctx,
> +                               V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> +       struct vb2_queue *dst_vq =
> +               v4l2_m2m_get_vq(stream->fh.m2m_ctx,
> +                               V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +       struct virtio_video *vv = vvd->vv;
> +       uint32_t data_size[VB2_MAX_PLANES] = {0};
> +
> +       mutex_lock(dst_vq->lock);
> +       for (;;) {
> +               dst_vb = v4l2_m2m_next_dst_buf(stream->fh.m2m_ctx);
> +               if (dst_vb == NULL)
> +                       break;
> +
> +               vb2_buf = &dst_vb->vb2_buf;
> +               virtio_vb = to_virtio_vb(vb2_buf);
> +
> +               for (i = 0; i < vb2_buf->num_planes; ++i)
> +                       data_size[i] = vb2_buf->planes[i].bytesused;
> +
> +               ret = virtio_video_cmd_resource_queue
> +                       (vv, stream->stream_id, virtio_vb, data_size,
> +                        vb2_buf->num_planes, VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +               if (ret) {
> +                       v4l2_err(&vv->v4l2_dev,
> +                                 "failed to queue a dst buffer\n");
> +                       v4l2_m2m_job_finish(vvd->m2m_dev, stream->fh.m2m_ctx);
> +                       mutex_unlock(dst_vq->lock);
> +                       return;
> +               }
> +
> +               virtio_vb->queued = true;
> +               stream->dst_cleared = false;
> +               dst_vb = v4l2_m2m_dst_buf_remove(stream->fh.m2m_ctx);
> +       }
> +       mutex_unlock(dst_vq->lock);
> +
> +       mutex_lock(src_vq->lock);
> +       for (;;) {
> +               if (stream->state == STREAM_STATE_DRAIN)
> +                       break;
> +
> +               src_vb = v4l2_m2m_next_src_buf(stream->fh.m2m_ctx);
> +               if (src_vb == NULL)
> +                       break;
> +
> +               vb2_buf = &src_vb->vb2_buf;
> +               virtio_vb = to_virtio_vb(vb2_buf);
> +
> +               for (i = 0; i < vb2_buf->num_planes; ++i)
> +                       data_size[i] = vb2_buf->planes[i].bytesused;
> +
> +               ret = virtio_video_cmd_resource_queue
> +                       (vv, stream->stream_id, virtio_vb, data_size,
> +                        vb2_buf->num_planes, VIRTIO_VIDEO_QUEUE_TYPE_INPUT);
> +               if (ret) {
> +                       v4l2_err(&vv->v4l2_dev,
> +                                 "failed to queue an src buffer\n");
> +                       v4l2_m2m_job_finish(vvd->m2m_dev, stream->fh.m2m_ctx);
> +                       mutex_unlock(src_vq->lock);
> +                       return;
> +               }
> +
> +               virtio_vb->queued = true;
> +               stream->src_cleared = false;
> +               src_vb = v4l2_m2m_src_buf_remove(stream->fh.m2m_ctx);
> +       }
> +       mutex_unlock(src_vq->lock);
> +
> +       v4l2_m2m_job_finish(vvd->m2m_dev, stream->fh.m2m_ctx);
> +}
> +
> +static int virtio_video_device_open(struct file *file)
> +{
> +       int ret;
> +       uint32_t stream_id;
> +       char name[TASK_COMM_LEN];
> +       struct virtio_video_stream *stream;
> +       struct video_format *default_fmt;
> +       enum virtio_video_format format;
> +       struct video_device *video_dev = video_devdata(file);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       switch (vvd->type) {
> +       case VIRTIO_VIDEO_DEVICE_ENCODER:
> +               default_fmt = list_first_entry_or_null(&vvd->output_fmt_list,
> +                                                      struct video_format,
> +                                                      formats_list_entry);
> +               break;
> +       case VIRTIO_VIDEO_DEVICE_DECODER:
> +               default_fmt = list_first_entry_or_null(&vvd->input_fmt_list,
> +                                                      struct video_format,
> +                                                      formats_list_entry);
> +               break;
> +       default:
> +               v4l2_err(&vv->v4l2_dev, "unsupported device type\n");
> +               return -EIO;
> +       }
> +
> +       if (!default_fmt) {
> +               v4l2_err(&vv->v4l2_dev, "device failed to start\n");
> +               return -EIO;
> +       }
> +
> +       stream = kzalloc(sizeof(*stream), GFP_KERNEL);
> +       if (!stream)
> +               return -ENOMEM;
> +
> +       get_task_comm(name, current);
> +       format = virtio_video_v4l2_format_to_virtio(default_fmt->desc.format);
> +       virtio_video_stream_id_get(vv, stream, &stream_id);
> +       ret = virtio_video_cmd_stream_create(vv, stream_id, format, name);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to create stream\n");
> +               goto err_stream_create;
> +       }
> +
> +       stream->video_dev = video_dev;
> +       stream->stream_id = stream_id;
> +       stream->state = STREAM_STATE_IDLE;
> +
> +       ret = virtio_video_cmd_get_params(vv, stream,
> +                                         VIRTIO_VIDEO_QUEUE_TYPE_INPUT);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to get stream in params\n");
> +               goto err_init_ctrls;
> +       }
> +
> +       ret = virtio_video_cmd_get_params(vv, stream,
> +                                         VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to get stream out params\n");
> +               goto err_init_ctrls;
> +       }
> +
> +       ret = virtio_video_cmd_get_control(vv, stream,
> +                                          VIRTIO_VIDEO_CONTROL_PROFILE);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to get stream profile\n");
> +               goto err_init_ctrls;
> +       }
> +
> +       ret = virtio_video_cmd_get_control(vv, stream,
> +                                          VIRTIO_VIDEO_CONTROL_LEVEL);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to get stream level\n");
> +               goto err_init_ctrls;
> +       }
> +
> +       ret = virtio_video_cmd_get_control(vv, stream,
> +                                          VIRTIO_VIDEO_CONTROL_BITRATE);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to get stream bitrate\n");
> +               goto err_init_ctrls;
> +       }
> +
> +       mutex_init(&stream->vq_mutex);
> +       INIT_WORK(&stream->work, virtio_video_worker);
> +       v4l2_fh_init(&stream->fh, video_dev);
> +       stream->fh.ctrl_handler = &stream->ctrl_handler;
> +
> +       switch (vvd->type) {
> +       case VIRTIO_VIDEO_DEVICE_ENCODER:
> +               stream->fh.m2m_ctx =
> +                       v4l2_m2m_ctx_init(vvd->m2m_dev, stream,
> +                                         &virtio_video_enc_init_queues);
> +               break;
> +       case VIRTIO_VIDEO_DEVICE_DECODER:
> +               stream->fh.m2m_ctx =
> +                       v4l2_m2m_ctx_init(vvd->m2m_dev, stream,
> +                                         &virtio_video_dec_init_queues);
> +               break;
> +       default:
> +               v4l2_err(&vv->v4l2_dev, "unsupported device type\n");
> +               goto err_stream_create;
> +       }
> +
> +       v4l2_m2m_set_src_buffered(stream->fh.m2m_ctx, true);
> +       v4l2_m2m_set_dst_buffered(stream->fh.m2m_ctx, true);
> +       file->private_data = &stream->fh;
> +       v4l2_fh_add(&stream->fh);
> +
> +       switch (vvd->type) {
> +       case VIRTIO_VIDEO_DEVICE_ENCODER:
> +               ret = virtio_video_enc_init_ctrls(stream);
> +               break;
> +       case VIRTIO_VIDEO_DEVICE_DECODER:
> +               ret = virtio_video_dec_init_ctrls(stream);
> +               break;
> +       default:
> +               ret = 0;
> +               break;
> +       }
> +
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to init controls\n");
> +               goto err_init_ctrls;
> +       }
> +       return 0;
> +
> +err_init_ctrls:
> +       v4l2_fh_del(&stream->fh);
> +       v4l2_fh_exit(&stream->fh);
> +       mutex_lock(video_dev->lock);
> +       v4l2_m2m_ctx_release(stream->fh.m2m_ctx);
> +       mutex_unlock(video_dev->lock);
> +err_stream_create:
> +       virtio_video_stream_id_put(vv, stream_id);
> +       kfree(stream);
> +
> +       return ret;
> +}
> +
> +static int virtio_video_device_release(struct file *file)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct video_device *video_dev = video_devdata(file);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       v4l2_fh_del(&stream->fh);
> +       v4l2_fh_exit(&stream->fh);
> +       mutex_lock(video_dev->lock);
> +       v4l2_m2m_ctx_release(stream->fh.m2m_ctx);
> +       mutex_unlock(video_dev->lock);
> +
> +       virtio_video_cmd_stream_destroy(vv, stream->stream_id);
> +       virtio_video_stream_id_put(vv, stream->stream_id);
> +
> +       kfree(stream);
> +
> +       return 0;
> +}
> +
> +static const struct v4l2_file_operations virtio_video_device_fops = {
> +       .owner          = THIS_MODULE,
> +       .open           = virtio_video_device_open,
> +       .release        = virtio_video_device_release,
> +       .poll           = v4l2_m2m_fop_poll,
> +       .unlocked_ioctl = video_ioctl2,
> +       .mmap           = v4l2_m2m_fop_mmap,
> +};
> +
> +static void virtio_video_device_run(void *priv)
> +{
> +       struct virtio_video_stream *stream = priv;
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +
> +       queue_work(vvd->workqueue, &stream->work);
> +}
> +
> +static int virtio_video_device_job_ready(void *priv)
> +{
> +       struct virtio_video_stream *stream = priv;
> +
> +       if (stream->state == STREAM_STATE_STOPPED)
> +               return 0;
> +
> +       if (v4l2_m2m_num_src_bufs_ready(stream->fh.m2m_ctx) > 0 ||
> +           v4l2_m2m_num_dst_bufs_ready(stream->fh.m2m_ctx) > 0)
> +               return 1;
> +
> +       return 0;
> +}
> +
> +static void virtio_video_device_job_abort(void *priv)
> +{
> +       struct virtio_video_stream *stream = priv;
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +
> +       v4l2_m2m_job_finish(vvd->m2m_dev, stream->fh.m2m_ctx);
> +}
> +
> +static const struct v4l2_m2m_ops virtio_video_device_m2m_ops = {
> +       .device_run     = virtio_video_device_run,
> +       .job_ready      = virtio_video_device_job_ready,
> +       .job_abort      = virtio_video_device_job_abort,
> +};
> +
> +static int virtio_video_device_register(struct virtio_video_device *vvd)
> +{
> +       int ret = 0;
> +       struct video_device *vd = NULL;
> +       struct virtio_video *vv = NULL;
> +
> +       if (!vvd)
> +               return -EINVAL;
> +
> +       vd = &vvd->video_dev;
> +       vv = vvd->vv;
> +
> +       switch (vvd->type) {
> +       case VIRTIO_VIDEO_DEVICE_ENCODER:
> +               ret = virtio_video_enc_init(vd);
> +               break;
> +       case VIRTIO_VIDEO_DEVICE_DECODER:
> +               ret = virtio_video_dec_init(vd);
> +               break;
> +       default:
> +               v4l2_err(&vv->v4l2_dev, "unknown device type\n");
> +               return -EINVAL;
> +       }
> +
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to init device\n");
> +               return ret;
> +       }
> +
> +       ret = video_register_device(vd, VFL_TYPE_GRABBER, 0);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to register video device\n");
> +               return ret;
> +       }
> +
> +       vvd->workqueue = alloc_ordered_workqueue(vd->name,
> +                                                WQ_MEM_RECLAIM | WQ_FREEZABLE);
> +       if (!vvd->workqueue) {
> +               v4l2_err(&vv->v4l2_dev, "failed to create a workqueue");
> +               video_unregister_device(vd);
> +               return -ENOMEM;
> +       }
> +
> +       list_add(&vvd->devices_list_entry, &vv->devices_list);
> +       v4l2_info(&vv->v4l2_dev, "Device '%s' registered as /dev/video%d\n",
> +                 vd->name, vd->num);
> +
> +       return 0;
> +}
> +
> +static void virtio_video_device_unregister(struct virtio_video_device *vvd)
> +{
> +       if (!vvd)
> +               return;
> +
> +       list_del(&vvd->devices_list_entry);
> +       flush_workqueue(vvd->workqueue);
> +       destroy_workqueue(vvd->workqueue);
> +       video_unregister_device(&vvd->video_dev);
> +}
> +
> +static struct virtio_video_device *
> +virtio_video_device_create(struct virtio_video *vv)
> +{
> +       struct device *dev = NULL;
> +       struct video_device *vd = NULL;
> +       struct v4l2_m2m_dev *m2m_dev = NULL;
> +       struct virtio_video_device *vvd = NULL;
> +
> +       if (!vv)
> +               return ERR_PTR(-EINVAL);
> +
> +       dev = &vv->vdev->dev;
> +
> +       vvd = devm_kzalloc(dev, sizeof(*vvd), GFP_KERNEL);
> +       if (!vvd)
> +               return ERR_PTR(-ENOMEM);
> +
> +       m2m_dev = v4l2_m2m_init(&virtio_video_device_m2m_ops);
> +       if (IS_ERR(m2m_dev)) {
> +               v4l2_err(&vv->v4l2_dev, "failed to init m2m device\n");
> +               goto err;
> +       }
> +
> +       vvd->vv = vv;
> +       vvd->m2m_dev = m2m_dev;
> +       mutex_init(&vvd->video_dev_mutex);
> +       vd = &vvd->video_dev;
> +       vd->lock = &vvd->video_dev_mutex;
> +       vd->v4l2_dev = &vv->v4l2_dev;
> +       vd->vfl_dir = VFL_DIR_M2M;
> +       vd->ioctl_ops = NULL;
> +       vd->fops = &virtio_video_device_fops;
> +       vd->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
> +       vd->release = video_device_release_empty;
> +
> +       /* Use the selection API instead */
> +       v4l2_disable_ioctl(vd, VIDIOC_CROPCAP);
> +       v4l2_disable_ioctl(vd, VIDIOC_G_CROP);
> +       v4l2_disable_ioctl(vd, VIDIOC_S_CROP);
> +
> +       video_set_drvdata(vd, vvd);
> +
> +       INIT_LIST_HEAD(&vvd->input_fmt_list);
> +       INIT_LIST_HEAD(&vvd->output_fmt_list);
> +       INIT_LIST_HEAD(&vvd->controls_fmt_list);
> +
> +       vvd->num_output_fmts = 0;
> +       vvd->num_input_fmts = 0;
> +
> +       switch (vv->vdev->id.device) {
> +       case VIRTIO_ID_VIDEO_ENC:
> +               vvd->type = VIRTIO_VIDEO_DEVICE_ENCODER;
> +               break;
> +       case VIRTIO_ID_VIDEO_DEC:
> +       default:
> +               vvd->type = VIRTIO_VIDEO_DEVICE_DECODER;
> +               break;
> +       }
> +
> +       return vvd;
> +
> +err:
> +       devm_kfree(dev, vvd);
> +
> +       return ERR_CAST(m2m_dev);
> +}
> +
> +void virtio_video_device_destroy(struct virtio_video_device *vvd)
> +{
> +       if (!vvd)
> +               return;
> +
> +       v4l2_m2m_release(vvd->m2m_dev);
> +       devm_kfree(&vvd->vv->vdev->dev, vvd);
> +}
> +
> +int virtio_video_device_init(struct virtio_video *vv,
> +                            void *input_buf, void *output_buf)
> +{
> +       int ret = 0;
> +       struct virtio_video_device *vvd = NULL;
> +
> +       if (!vv || !input_buf || !output_buf)
> +               return -EINVAL;
> +
> +
> +       vvd = virtio_video_device_create(vv);
> +       if (IS_ERR(vvd)) {
> +               v4l2_err(&vv->v4l2_dev,
> +                        "failed to create virtio video device\n");
> +               ret = PTR_ERR(vvd);
> +               goto failed;
> +       }
> +
> +       ret = virtio_video_parse_virtio_capability(vvd, input_buf, output_buf);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to parse a function\n");
> +               virtio_video_device_destroy(vvd);
> +               ret = -EINVAL;
> +               goto failed;
> +       }
> +
> +       ret = virtio_video_parse_virtio_control(vvd);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to query controls\n");
> +               virtio_video_clean_capability(vvd);
> +               virtio_video_device_destroy(vvd);
> +               goto failed;
> +       }
> +
> +       ret = virtio_video_device_register(vvd);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev,
> +                        "failed to init virtio video device\n");
> +               virtio_video_clean_control(vvd);
> +               virtio_video_clean_capability(vvd);
> +               virtio_video_device_destroy(vvd);
> +               goto failed;
> +       }
> +
> +       return 0;
> +
> +failed:
> +       virtio_video_device_deinit(vv);
> +
> +       return ret;
> +}
> +
> +void virtio_video_device_deinit(struct virtio_video *vv)
> +{
> +       struct virtio_video_device *vvd = NULL, *tmp = NULL;
> +
> +       list_for_each_entry_safe(vvd, tmp, &vv->devices_list,
> +                                devices_list_entry) {
> +               virtio_video_device_unregister(vvd);
> +               virtio_video_clean_control(vvd);
> +               virtio_video_clean_capability(vvd);
> +               virtio_video_device_destroy(vvd);
> +       }
> +}
> diff --git a/drivers/media/virtio/virtio_video_driver.c b/drivers/media/virtio/virtio_video_driver.c
> new file mode 100644
> index 000000000000..2d4fd7671f4f
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_driver.c
> @@ -0,0 +1,315 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/* Driver for virtio video device.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/version.h>
> +#include <linux/dma-mapping.h>
> +
> +#include "virtio_video.h"
> +
> +static unsigned int debug;
> +module_param(debug, uint, 0644);
> +
> +static unsigned int use_dma_mem;
> +module_param(use_dma_mem, uint, 0644);
> +MODULE_PARM_DESC(use_dma_mem, "Try to allocate buffers from the DMA zone");
> +
> +static void virtio_video_init_vq(struct virtio_video_queue *vvq,
> +                                void (*work_func)(struct work_struct *work))
> +{
> +       spin_lock_init(&vvq->qlock);
> +       init_waitqueue_head(&vvq->ack_queue);
> +       INIT_WORK(&vvq->dequeue_work, work_func);
> +}
> +
> +static void *dma_phys_alloc(struct device *dev, size_t size,
> +                           dma_addr_t *dma_handle, gfp_t gfp,
> +                           unsigned long attrs)
> +{
> +       void *ret;
> +
> +       ret = (void *)__get_free_pages(gfp, get_order(size));
> +       if (ret)
> +               *dma_handle = virt_to_phys(ret) - PFN_PHYS(dev->dma_pfn_offset);
> +
> +       return ret;
> +}
> +
> +static void dma_phys_free(struct device *dev, size_t size,
> +                         void *cpu_addr, dma_addr_t dma_addr,
> +                         unsigned long attrs)
> +{
> +       free_pages((unsigned long)cpu_addr, get_order(size));
> +}
> +
> +static dma_addr_t dma_phys_map_page(struct device *dev, struct page *page,
> +                                   unsigned long offset, size_t size,
> +                                   enum dma_data_direction dir,
> +                                   unsigned long attrs)
> +{
> +       return page_to_phys(page) + offset - PFN_PHYS(dev->dma_pfn_offset);
> +}
> +
> +static int dma_phys_map_sg(struct device *dev, struct scatterlist *sgl,
> +                          int nents, enum dma_data_direction dir,
> +                          unsigned long attrs)
> +{
> +       int i;
> +       struct scatterlist *sg;
> +
> +       for_each_sg(sgl, sg, nents, i) {
> +               dma_addr_t offset = PFN_PHYS(dev->dma_pfn_offset);
> +               void *va;
> +
> +               BUG_ON(!sg_page(sg));
> +               va = sg_virt(sg);
> +               sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va) - offset;
> +               sg_dma_len(sg) = sg->length;
> +       }
> +
> +       return nents;
> +}
> +
> +const struct dma_map_ops dma_phys_ops = {
> +       .alloc                  = dma_phys_alloc,
> +       .free                   = dma_phys_free,
> +       .map_page               = dma_phys_map_page,
> +       .map_sg                 = dma_phys_map_sg,
> +};
> +
> +static int virtio_video_query_cap_resp_buf(struct virtio_video *vv, void
> +                                          **resp_buf, int queue_type)
> +{
> +       int ret = 0;
> +       int resp_size = vv->max_caps_len;
> +
> +       *resp_buf = kzalloc(vv->max_caps_len, GFP_KERNEL);
> +       if (IS_ERR(*resp_buf)) {
> +               ret = PTR_ERR(*resp_buf);
> +               goto err;
> +       }
> +
> +       vv->got_caps = false;
> +       ret = virtio_video_query_capability(vv, *resp_buf, resp_size,
> +                                           queue_type);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to query capability\n");
> +               goto err;
> +       }
> +
> +       ret = wait_event_timeout(vv->wq, vv->got_caps, 5 * HZ);
> +       if (ret == 0) {
> +               v4l2_err(&vv->v4l2_dev, "timed out waiting for get caps\n");
> +               ret = -EIO;
> +               goto err;
> +       }
> +
> +       return 0;
> +err:
> +       return ret;
> +}
> +
> +static int virtio_video_init(struct virtio_video *vv)
> +{
> +       int ret = 0;
> +       void *input_resp_buf = NULL;
> +       void *output_resp_buf = NULL;
> +
> +       if (!vv)
> +               return -EINVAL;
> +
> +       ret = virtio_video_query_cap_resp_buf(vv, &input_resp_buf,
> +                                             VIRTIO_VIDEO_QUEUE_TYPE_INPUT);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to get input caps\n");
> +               goto err;
> +       }
> +
> +       ret = virtio_video_query_cap_resp_buf(vv, &output_resp_buf,
> +                                             VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to get output caps\n");
> +               goto err;
> +       }
> +
> +       ret = virtio_video_device_init(vv, input_resp_buf, output_resp_buf);
> +       if (ret)
> +               v4l2_err(&vv->v4l2_dev, "failed to initialize devices\n");
> +
> +err:
> +       kfree(input_resp_buf);
> +       kfree(output_resp_buf);
> +
> +       return ret;
> +};
> +
> +static int virtio_video_probe(struct virtio_device *vdev)
> +{
> +       int ret;
> +       struct virtio_video *vv;
> +       struct virtqueue *vqs[2];
> +       struct device *dev = &vdev->dev;
> +
> +       static const char * const names[] = { "control", "event" };
> +       static vq_callback_t *callbacks[] = {
> +               virtio_video_cmd_ack,
> +               virtio_video_event_ack
> +       };
> +
> +       if (!virtio_has_feature(vdev, VIRTIO_VIDEO_F_RESOURCE_GUEST_PAGES)) {
> +               dev_err(dev, "device must support guest allocated buffers\n");
> +               return -ENODEV;
> +       }
> +
> +       vv = devm_kzalloc(dev, sizeof(*vv), GFP_KERNEL);
> +       if (!vv)
> +               return -ENOMEM;
> +
> +       vv->vdev = vdev;
> +       vv->debug = debug;
> +       vv->use_dma_mem = use_dma_mem;
> +       vdev->priv = vv;
> +
> +       spin_lock_init(&vv->resource_idr_lock);
> +       idr_init(&vv->resource_idr);
> +       spin_lock_init(&vv->stream_idr_lock);
> +       idr_init(&vv->stream_idr);
> +
> +       init_waitqueue_head(&vv->wq);
> +
> +       if (virtio_has_feature(vdev, VIRTIO_VIDEO_F_RESOURCE_NON_CONTIG))
> +               vv->supp_non_contig = true;
> +
> +       vv->has_iommu = !virtio_has_iommu_quirk(vdev);
> +       if (!vv->has_iommu)
> +               set_dma_ops(dev, &dma_phys_ops);
> +
> +       dev_set_name(dev, "%s.%i", DRIVER_NAME, vdev->index);
> +       ret = v4l2_device_register(dev, &vv->v4l2_dev);
> +       if (ret)
> +               goto err_v4l2_reg;
> +
> +       virtio_video_init_vq(&vv->commandq, virtio_video_dequeue_cmd_func);
> +       virtio_video_init_vq(&vv->eventq, virtio_video_dequeue_event_func);
> +
> +       ret = virtio_find_vqs(vdev, 2, vqs, callbacks, names, NULL);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to find virt queues\n");
> +               goto err_vqs;
> +       }
> +
> +       vv->commandq.vq = vqs[0];
> +       vv->eventq.vq = vqs[1];
> +
> +       ret = virtio_video_alloc_vbufs(vv);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to alloc vbufs\n");
> +               goto err_vbufs;
> +       }
> +
> +       virtio_cread(vdev, struct virtio_video_config, max_caps_length,
> +                    &vv->max_caps_len);
> +       if (!vv->max_caps_len) {
> +               v4l2_err(&vv->v4l2_dev, "max_caps_len is zero\n");
> +               ret = -EINVAL;
> +               goto err_config;
> +       }
> +
> +       virtio_cread(vdev, struct virtio_video_config, max_resp_length,
> +                    &vv->max_resp_len);
> +       if (!vv->max_resp_len) {
> +               v4l2_err(&vv->v4l2_dev, "max_resp_len is zero\n");
> +               ret = -EINVAL;
> +               goto err_config;
> +       }
> +
> +       ret = virtio_video_alloc_events(vv, vv->eventq.vq->num_free);
> +       if (ret)
> +               goto err_events;
> +
> +       virtio_device_ready(vdev);
> +       vv->vq_ready = true;
> +       vv->got_caps = false;
> +
> +       INIT_LIST_HEAD(&vv->devices_list);
> +
> +       ret = virtio_video_init(vv);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev,
> +                        "failed to init virtio video\n");
> +               goto err_init;
> +       }
> +
> +       return 0;
> +
> +err_init:
> +err_events:
> +err_config:
> +       virtio_video_free_vbufs(vv);
> +err_vbufs:
> +       vdev->config->del_vqs(vdev);
> +err_vqs:
> +       v4l2_device_unregister(&vv->v4l2_dev);
> +err_v4l2_reg:
> +       devm_kfree(&vdev->dev, vv);
> +
> +       return ret;
> +}
> +
> +static void virtio_video_remove(struct virtio_device *vdev)
> +{
> +       struct virtio_video *vv = vdev->priv;
> +
> +       virtio_video_device_deinit(vv);
> +       virtio_video_free_vbufs(vv);
> +       vdev->config->del_vqs(vdev);
> +       v4l2_device_unregister(&vv->v4l2_dev);
> +       devm_kfree(&vdev->dev, vv);
> +}
> +
> +static struct virtio_device_id id_table[] = {
> +       { VIRTIO_ID_VIDEO_DEC, VIRTIO_DEV_ANY_ID },
> +       { VIRTIO_ID_VIDEO_ENC, VIRTIO_DEV_ANY_ID },
> +       { 0 },
> +};
> +
> +static unsigned int features[] = {
> +       VIRTIO_VIDEO_F_RESOURCE_GUEST_PAGES,
> +       VIRTIO_VIDEO_F_RESOURCE_NON_CONTIG,
> +};
> +
> +static struct virtio_driver virtio_video_driver = {
> +       .feature_table = features,
> +       .feature_table_size = ARRAY_SIZE(features),
> +       .driver.name = DRIVER_NAME,
> +       .driver.owner = THIS_MODULE,
> +       .id_table = id_table,
> +       .probe = virtio_video_probe,
> +       .remove = virtio_video_remove,
> +};
> +
> +module_virtio_driver(virtio_video_driver);
> +
> +MODULE_DEVICE_TABLE(virtio, id_table);
> +MODULE_DESCRIPTION("virtio video driver");
> +MODULE_AUTHOR("Dmitry Sepp <dmitry.sepp@xxxxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Kiran Pawar <kiran.pawar@xxxxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Nikolay Martyanov <nikolay.martyanov@xxxxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Samiullah Khawaja <samiullah.khawaja@xxxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/media/virtio/virtio_video_enc.c b/drivers/media/virtio/virtio_video_enc.c
> new file mode 100644
> index 000000000000..d9bd5f293900
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_enc.c
> @@ -0,0 +1,569 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/* Encoder for virtio video device.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +
> +#include "virtio_video.h"
> +
> +static void virtio_video_enc_buf_queue(struct vb2_buffer *vb)
> +{
> +       struct vb2_v4l2_buffer *v4l2_vb = to_vb2_v4l2_buffer(vb);
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vb->vb2_queue);
> +
> +       v4l2_m2m_buf_queue(stream->fh.m2m_ctx, v4l2_vb);
> +
> +}
> +
> +static int virtio_video_enc_start_streaming(struct vb2_queue *vq,
> +                                       unsigned int count)
> +{
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vq);
> +       bool input_queue = V4L2_TYPE_IS_OUTPUT(vq->type);
> +
> +       if (stream->state == STREAM_STATE_INIT ||
> +           (!input_queue && stream->state == STREAM_STATE_RESET) ||
> +           (input_queue && stream->state == STREAM_STATE_STOPPED))
> +               stream->state = STREAM_STATE_RUNNING;
> +
> +       return 0;
> +}
> +
> +static void virtio_video_enc_stop_streaming(struct vb2_queue *vq)
> +{
> +       int ret, queue_type;
> +       bool *cleared;
> +       bool is_v4l2_output = V4L2_TYPE_IS_OUTPUT(vq->type);
> +       struct virtio_video_stream *stream = vb2_get_drv_priv(vq);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct vb2_v4l2_buffer *v4l2_vb;
> +
> +       if (is_v4l2_output) {
> +               cleared = &stream->src_cleared;
> +               queue_type = VIRTIO_VIDEO_QUEUE_TYPE_INPUT;
> +       } else {
> +               cleared = &stream->dst_cleared;
> +               queue_type = VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT;
> +       }
> +
> +       ret = virtio_video_cmd_queue_clear(vv, stream, queue_type);
> +       if (ret) {
> +               v4l2_err(&vv->v4l2_dev, "failed to clear queue\n");
> +               return;
> +       }
> +
> +       ret = wait_event_timeout(vv->wq, *cleared, 5 * HZ);
> +       if (ret == 0) {
> +               v4l2_err(&vv->v4l2_dev, "timed out waiting for queue clear\n");
> +               return;
> +       }
> +
> +       for (;;) {
> +               if (is_v4l2_output)
> +                       v4l2_vb = v4l2_m2m_src_buf_remove(stream->fh.m2m_ctx);
> +               else
> +                       v4l2_vb = v4l2_m2m_dst_buf_remove(stream->fh.m2m_ctx);
> +               if (!v4l2_vb)
> +                       break;
> +               v4l2_m2m_buf_done(v4l2_vb, VB2_BUF_STATE_ERROR);
> +       }
> +
> +       if (is_v4l2_output)
> +               stream->state = STREAM_STATE_STOPPED;
> +       else
> +               stream->state = STREAM_STATE_RESET;
> +}
> +
> +static const struct vb2_ops virtio_video_enc_qops = {
> +       .queue_setup     = virtio_video_queue_setup,
> +       .buf_init        = virtio_video_buf_init,
> +       .buf_cleanup     = virtio_video_buf_cleanup,
> +       .buf_queue       = virtio_video_enc_buf_queue,
> +       .start_streaming = virtio_video_enc_start_streaming,
> +       .stop_streaming  = virtio_video_enc_stop_streaming,
> +       .wait_prepare    = vb2_ops_wait_prepare,
> +       .wait_finish     = vb2_ops_wait_finish,
> +};
> +
> +static int virtio_video_enc_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +       int ret = 0;
> +       struct virtio_video_stream *stream = ctrl2stream(ctrl);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       uint32_t control, value;
> +
> +       control = virtio_video_v4l2_control_to_virtio(ctrl->id);
> +
> +       switch (ctrl->id) {
> +       case V4L2_CID_MPEG_VIDEO_BITRATE:
> +               ret = virtio_video_cmd_set_control(vv, stream->stream_id,
> +                                                  control, ctrl->val);
> +               break;
> +       case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
> +               value = virtio_video_v4l2_level_to_virtio(ctrl->val);
> +               ret = virtio_video_cmd_set_control(vv, stream->stream_id,
> +                                                  control, value);
> +               break;
> +       case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
> +               value = virtio_video_v4l2_profile_to_virtio(ctrl->val);
> +               ret = virtio_video_cmd_set_control(vv, stream->stream_id,
> +                                                  control, value);
> +               break;
> +       default:
> +               ret = -EINVAL;
> +               break;
> +       }
> +
> +       return ret;
> +}
> +
> +static int virtio_video_enc_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +       int ret = 0;
> +       struct virtio_video_stream *stream = ctrl2stream(ctrl);
> +
> +       switch (ctrl->id) {
> +       case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
> +               if (stream->state >= STREAM_STATE_INIT)
> +                       ctrl->val = stream->in_info.min_buffers;
> +               else
> +                       ctrl->val = 0;
> +               break;
> +       default:
> +               ret = -EINVAL;
> +       }
> +
> +       return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops virtio_video_enc_ctrl_ops = {
> +       .g_volatile_ctrl        = virtio_video_enc_g_volatile_ctrl,
> +       .s_ctrl                 = virtio_video_enc_s_ctrl,
> +};
> +
> +int virtio_video_enc_init_ctrls(struct virtio_video_stream *stream)
> +{
> +       struct v4l2_ctrl *ctrl;
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct video_control_format *c_fmt = NULL;
> +
> +       v4l2_ctrl_handler_init(&stream->ctrl_handler, 1);
> +
> +       ctrl = v4l2_ctrl_new_std(&stream->ctrl_handler,
> +                               &virtio_video_enc_ctrl_ops,
> +                               V4L2_CID_MIN_BUFFERS_FOR_OUTPUT,
> +                               MIN_BUFS_MIN, MIN_BUFS_MAX, MIN_BUFS_STEP,
> +                               MIN_BUFS_DEF);
> +       ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
> +
> +       list_for_each_entry(c_fmt, &vvd->controls_fmt_list,
> +                           controls_list_entry) {
> +               switch (c_fmt->format) {
> +               case V4L2_PIX_FMT_H264:
> +                       if (c_fmt->profile)
> +                               v4l2_ctrl_new_std_menu
> +                                       (&stream->ctrl_handler,
> +                                        &virtio_video_enc_ctrl_ops,
> +                                        V4L2_CID_MPEG_VIDEO_H264_PROFILE,
> +                                        c_fmt->profile->max,
> +                                        c_fmt->profile->skip_mask,
> +                                        c_fmt->profile->min);
> +
> +                       if (c_fmt->level)
> +                               v4l2_ctrl_new_std_menu
> +                                       (&stream->ctrl_handler,
> +                                        &virtio_video_enc_ctrl_ops,
> +                                        V4L2_CID_MPEG_VIDEO_H264_LEVEL,
> +                                        c_fmt->level->max,
> +                                        c_fmt->level->skip_mask,
> +                                        c_fmt->level->min);
> +                       break;
> +               default:
> +                       v4l2_dbg(1, vv->debug,
> +                                &vv->v4l2_dev, "unsupported format\n");
> +                       break;
> +               }
> +       }
> +
> +       if (stream->control.bitrate) {
> +               v4l2_ctrl_new_std(&stream->ctrl_handler,
> +                                 &virtio_video_enc_ctrl_ops,
> +                                 V4L2_CID_MPEG_VIDEO_BITRATE,
> +                                 1, stream->control.bitrate,
> +                                 1, stream->control.bitrate);
> +       }
> +
> +       if (stream->ctrl_handler.error)
> +               return stream->ctrl_handler.error;
> +
> +       v4l2_ctrl_handler_setup(&stream->ctrl_handler);
> +
> +       return 0;
> +}
> +
> +int virtio_video_enc_init_queues(void *priv, struct vb2_queue *src_vq,
> +                                struct vb2_queue *dst_vq)
> +{
> +       int ret;
> +       struct virtio_video_stream *stream = priv;
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct device *dev = vv->v4l2_dev.dev;
> +
> +       src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +       src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +       src_vq->drv_priv = stream;
> +       src_vq->buf_struct_size = sizeof(struct virtio_video_buffer);
> +       src_vq->ops = &virtio_video_enc_qops;
> +       src_vq->mem_ops = virtio_video_mem_ops(vv);
> +       src_vq->min_buffers_needed = stream->in_info.min_buffers;
> +       src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +       src_vq->lock = &stream->vq_mutex;
> +       src_vq->gfp_flags = virtio_video_gfp_flags(vv);
> +       src_vq->dev = dev;
> +
> +       ret = vb2_queue_init(src_vq);
> +       if (ret)
> +               return ret;
> +
> +       dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +       dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +       dst_vq->drv_priv = stream;
> +       dst_vq->buf_struct_size = sizeof(struct virtio_video_buffer);
> +       dst_vq->ops = &virtio_video_enc_qops;
> +       dst_vq->mem_ops = virtio_video_mem_ops(vv);
> +       dst_vq->min_buffers_needed = stream->out_info.min_buffers;
> +       dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +       dst_vq->lock = &stream->vq_mutex;
> +       dst_vq->gfp_flags = virtio_video_gfp_flags(vv);
> +       dst_vq->dev = dev;
> +
> +       return vb2_queue_init(dst_vq);
> +}
> +
> +static int virtio_video_try_encoder_cmd(struct file *file, void *fh,
> +                                       struct v4l2_encoder_cmd *cmd)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       if (stream->state == STREAM_STATE_DRAIN)
> +               return -EBUSY;
> +
> +       switch (cmd->cmd) {
> +       case V4L2_ENC_CMD_STOP:
> +       case V4L2_ENC_CMD_START:
> +               if (cmd->flags != 0) {
> +                       v4l2_err(&vv->v4l2_dev, "flags=%u are not supported",
> +                                cmd->flags);
> +                       return -EINVAL;
> +               }
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static int virtio_video_encoder_cmd(struct file *file, void *fh,
> +                                   struct v4l2_encoder_cmd *cmd)
> +{
> +       int ret;
> +       struct vb2_queue *src_vq, *dst_vq;
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = video_drvdata(file);
> +       struct virtio_video *vv = vvd->vv;
> +
> +       ret = virtio_video_try_encoder_cmd(file, fh, cmd);
> +       if (ret < 0)
> +               return ret;
> +
> +       dst_vq = v4l2_m2m_get_vq(stream->fh.m2m_ctx,
> +                                V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +
> +       switch (cmd->cmd) {
> +       case V4L2_ENC_CMD_START:
> +               vb2_clear_last_buffer_dequeued(dst_vq);
> +               stream->state = STREAM_STATE_RUNNING;
> +               break;
> +       case V4L2_ENC_CMD_STOP:
> +               src_vq = v4l2_m2m_get_vq(stream->fh.m2m_ctx,
> +                                        V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> +
> +               if (!vb2_is_streaming(src_vq)) {
> +                       v4l2_dbg(1, vv->debug,
> +                                &vv->v4l2_dev, "output is not streaming\n");
> +                       return 0;
> +               }
> +
> +               if (!vb2_is_streaming(dst_vq)) {
> +                       v4l2_dbg(1, vv->debug,
> +                                &vv->v4l2_dev, "capture is not streaming\n");
> +                       return 0;
> +               }
> +
> +               ret = virtio_video_cmd_stream_drain(vv, stream->stream_id);
> +               if (ret) {
> +                       v4l2_err(&vv->v4l2_dev, "failed to drain stream\n");
> +                       return ret;
> +               }
> +
> +               stream->state = STREAM_STATE_DRAIN;
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static int virtio_video_enc_enum_fmt_vid_cap(struct file *file, void *fh,
> +                                            struct v4l2_fmtdesc *f)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format *fmt = NULL;
> +       int idx = 0;
> +
> +       if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +               return -EINVAL;
> +
> +       if (f->index >= vvd->num_output_fmts)
> +               return -EINVAL;
> +
> +       list_for_each_entry(fmt, &vvd->output_fmt_list, formats_list_entry) {
> +               if (f->index == idx) {
> +                       f->pixelformat = fmt->desc.format;
> +                       return 0;
> +               }
> +               idx++;
> +       }
> +       return -EINVAL;
> +}
> +
> +static int virtio_video_enc_enum_fmt_vid_out(struct file *file, void *fh,
> +                                            struct v4l2_fmtdesc *f)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct video_format_info *info = NULL;
> +       struct video_format *fmt = NULL;
> +       unsigned long output_mask = 0;
> +       int idx = 0, bit_num = 0;
> +
> +       if (f->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +               return -EINVAL;
> +
> +       if (f->index >= vvd->num_input_fmts)
> +               return -EINVAL;
> +
> +       info = &stream->out_info;
> +       list_for_each_entry(fmt, &vvd->output_fmt_list, formats_list_entry) {
> +               if (info->fourcc_format == fmt->desc.format) {
> +                       output_mask = fmt->desc.mask;
> +                       break;
> +               }
> +       }
> +
> +       if (output_mask == 0)
> +               return -EINVAL;
> +
> +       list_for_each_entry(fmt, &vvd->input_fmt_list, formats_list_entry) {
> +               if (test_bit(bit_num, &output_mask)) {
> +                       if (f->index == idx) {
> +                               f->pixelformat = fmt->desc.format;
> +                               return 0;
> +                       }
> +                       idx++;
> +               }
> +               bit_num++;
> +       }
> +       return -EINVAL;
> +}
> +
> +static int virtio_video_enc_s_fmt(struct file *file, void *fh,
> +                                 struct v4l2_format *f)
> +{
> +       int ret;
> +       struct virtio_video_stream *stream = file2stream(file);
> +
> +       ret = virtio_video_s_fmt(file, fh, f);
> +       if (ret)
> +               return ret;
> +
> +       if (!V4L2_TYPE_IS_OUTPUT(f->type)) {
> +               if (stream->state == STREAM_STATE_IDLE)
> +                       stream->state = STREAM_STATE_INIT;
> +       }
> +
> +       return 0;
> +}
> +
> +static int virtio_video_enc_try_framerate(struct virtio_video_stream *stream,
> +                                         unsigned int fps)
> +{
> +       int rate_idx;
> +       struct video_format_frame *frame = NULL;
> +
> +       if (stream->current_frame == NULL)
> +               return -EINVAL;
> +
> +       frame = stream->current_frame;
> +       for (rate_idx = 0; rate_idx < frame->frame.num_rates; rate_idx++) {
> +               struct virtio_video_format_range *frame_rate =
> +                       &frame->frame_rates[rate_idx];
> +
> +               if (within_range(frame_rate->min, fps, frame_rate->max))
> +                       return 0;
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static void virtio_video_timeperframe_from_info(struct video_format_info *info,
> +                                               struct v4l2_fract *timeperframe)
> +{
> +       timeperframe->numerator = info->frame_rate;
> +       timeperframe->denominator = 1;
> +}
> +
> +static int virtio_video_enc_g_parm(struct file *file, void *priv,
> +                                  struct v4l2_streamparm *a)
> +{
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct v4l2_outputparm *out = &a->parm.output;
> +       struct v4l2_fract *timeperframe = &out->timeperframe;
> +
> +       if (!V4L2_TYPE_IS_OUTPUT(a->type)) {
> +               v4l2_err(&vv->v4l2_dev,
> +                        "getting FPS is only possible for the output queue\n");
> +               return -EINVAL;
> +       }
> +
> +       out->capability = V4L2_CAP_TIMEPERFRAME;
> +       virtio_video_timeperframe_from_info(&stream->in_info, timeperframe);
> +
> +       return 0;
> +}
> +
> +static int virtio_video_enc_s_parm(struct file *file, void *priv,
> +                                  struct v4l2_streamparm *a)
> +{
> +       int ret;
> +       u64 frame_interval, frame_rate;
> +       struct video_format_info info;
> +       struct virtio_video_stream *stream = file2stream(file);
> +       struct virtio_video_device *vvd = to_virtio_vd(stream->video_dev);
> +       struct virtio_video *vv = vvd->vv;
> +       struct v4l2_outputparm *out = &a->parm.output;
> +       struct v4l2_fract *timeperframe = &out->timeperframe;
> +
> +       if (V4L2_TYPE_IS_OUTPUT(a->type)) {
> +               frame_interval = timeperframe->numerator * (u64)USEC_PER_SEC;
> +               do_div(frame_interval, timeperframe->denominator);
> +               if (!frame_interval)
> +                       return -EINVAL;
> +
> +               frame_rate = (u64)USEC_PER_SEC;
> +               do_div(frame_rate, frame_interval);
> +       } else {
> +               v4l2_err(&vv->v4l2_dev,
> +                        "setting FPS is only possible for the output queue\n");
> +               return -EINVAL;
> +       }
> +
> +       ret = virtio_video_enc_try_framerate(stream, frame_rate);
> +       if (ret)
> +               return ret;
> +
> +       virtio_video_format_fill_default_info(&info, &stream->in_info);
> +       info.frame_rate = frame_rate;
> +
> +       virtio_video_cmd_set_params(vv, stream, &info,
> +                                   VIRTIO_VIDEO_QUEUE_TYPE_INPUT);
> +       virtio_video_cmd_get_params(vv, stream, VIRTIO_VIDEO_QUEUE_TYPE_INPUT);
> +       virtio_video_cmd_get_params(vv, stream, VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +
> +       out->capability = V4L2_CAP_TIMEPERFRAME;
> +       virtio_video_timeperframe_from_info(&stream->in_info, timeperframe);
> +
> +       return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops virtio_video_enc_ioctl_ops = {
> +       .vidioc_querycap        = virtio_video_querycap,
> +
> +       .vidioc_enum_fmt_vid_cap = virtio_video_enc_enum_fmt_vid_cap,
> +       .vidioc_g_fmt_vid_cap   = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_cap   = virtio_video_enc_s_fmt,
> +
> +       .vidioc_enum_fmt_vid_cap_mplane = virtio_video_enc_enum_fmt_vid_cap,
> +       .vidioc_g_fmt_vid_cap_mplane    = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_cap_mplane    = virtio_video_enc_s_fmt,
> +
> +       .vidioc_enum_fmt_vid_out = virtio_video_enc_enum_fmt_vid_out,
> +       .vidioc_g_fmt_vid_out   = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_out   = virtio_video_enc_s_fmt,
> +
> +       .vidioc_enum_fmt_vid_out_mplane = virtio_video_enc_enum_fmt_vid_out,
> +       .vidioc_g_fmt_vid_out_mplane    = virtio_video_g_fmt,
> +       .vidioc_s_fmt_vid_out_mplane    = virtio_video_enc_s_fmt,
> +
> +       .vidioc_try_encoder_cmd = virtio_video_try_encoder_cmd,
> +       .vidioc_encoder_cmd     = virtio_video_encoder_cmd,
> +       .vidioc_enum_frameintervals = virtio_video_enum_framemintervals,
> +       .vidioc_enum_framesizes = virtio_video_enum_framesizes,
> +
> +       .vidioc_g_selection = virtio_video_g_selection,
> +       .vidioc_s_selection = virtio_video_s_selection,
> +
> +       .vidioc_reqbufs         = virtio_video_reqbufs,
> +       .vidioc_querybuf        = v4l2_m2m_ioctl_querybuf,
> +       .vidioc_qbuf            = v4l2_m2m_ioctl_qbuf,
> +       .vidioc_dqbuf           = v4l2_m2m_ioctl_dqbuf,
> +       .vidioc_prepare_buf     = v4l2_m2m_ioctl_prepare_buf,
> +       .vidioc_create_bufs     = v4l2_m2m_ioctl_create_bufs,
> +       .vidioc_expbuf          = v4l2_m2m_ioctl_expbuf,
> +
> +       .vidioc_streamon        = v4l2_m2m_ioctl_streamon,
> +       .vidioc_streamoff       = v4l2_m2m_ioctl_streamoff,
> +
> +       .vidioc_s_parm          = virtio_video_enc_s_parm,
> +       .vidioc_g_parm          = virtio_video_enc_g_parm,
> +
> +       .vidioc_subscribe_event = virtio_video_subscribe_event,
> +       .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +int virtio_video_enc_init(struct video_device *vd)
> +{
> +       ssize_t num;
> +
> +       vd->ioctl_ops = &virtio_video_enc_ioctl_ops;
> +       num = strscpy(vd->name, "stateful-encoder", sizeof(vd->name));
> +
> +       return 0;
> +}
> diff --git a/drivers/media/virtio/virtio_video_enc.h b/drivers/media/virtio/virtio_video_enc.h
> new file mode 100644
> index 000000000000..3d2a27a8e08c
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_enc.h
> @@ -0,0 +1,30 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/* Encoder header for virtio video driver.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _VIRTIO_VIDEO_ENC_H
> +#define _VIRTIO_VIDEO_ENC_H
> +
> +#include "virtio_video.h"
> +
> +int virtio_video_enc_init(struct video_device *vd);
> +int virtio_video_enc_init_ctrls(struct virtio_video_stream *stream);
> +int virtio_video_enc_init_queues(void *priv, struct vb2_queue *src_vq,
> +                                struct vb2_queue *dst_vq);
> +
> +#endif /* _VIRTIO_VIDEO_ENC_H */
> diff --git a/drivers/media/virtio/virtio_video_helpers.c b/drivers/media/virtio/virtio_video_helpers.c
> new file mode 100644
> index 000000000000..bc4754e7ca78
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_helpers.c
> @@ -0,0 +1,250 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/* Driver for virtio video device.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "virtio_video.h"
> +
> +struct virtio_video_convert_table {
> +       uint32_t virtio_value;
> +       uint32_t v4l2_value;
> +};
> +
> +static struct virtio_video_convert_table level_table[] = {
> +       { VIRTIO_VIDEO_LEVEL_H264_1_0, V4L2_MPEG_VIDEO_H264_LEVEL_1_0 },
> +       { VIRTIO_VIDEO_LEVEL_H264_1_1, V4L2_MPEG_VIDEO_H264_LEVEL_1_1 },
> +       { VIRTIO_VIDEO_LEVEL_H264_1_2, V4L2_MPEG_VIDEO_H264_LEVEL_1_2 },
> +       { VIRTIO_VIDEO_LEVEL_H264_1_3, V4L2_MPEG_VIDEO_H264_LEVEL_1_3 },
> +       { VIRTIO_VIDEO_LEVEL_H264_2_0, V4L2_MPEG_VIDEO_H264_LEVEL_2_0 },
> +       { VIRTIO_VIDEO_LEVEL_H264_2_1, V4L2_MPEG_VIDEO_H264_LEVEL_2_1 },
> +       { VIRTIO_VIDEO_LEVEL_H264_2_2, V4L2_MPEG_VIDEO_H264_LEVEL_2_2 },
> +       { VIRTIO_VIDEO_LEVEL_H264_3_0, V4L2_MPEG_VIDEO_H264_LEVEL_3_0 },
> +       { VIRTIO_VIDEO_LEVEL_H264_3_1, V4L2_MPEG_VIDEO_H264_LEVEL_3_1 },
> +       { VIRTIO_VIDEO_LEVEL_H264_3_2, V4L2_MPEG_VIDEO_H264_LEVEL_3_2 },
> +       { VIRTIO_VIDEO_LEVEL_H264_4_0, V4L2_MPEG_VIDEO_H264_LEVEL_4_0 },
> +       { VIRTIO_VIDEO_LEVEL_H264_4_1, V4L2_MPEG_VIDEO_H264_LEVEL_4_1 },
> +       { VIRTIO_VIDEO_LEVEL_H264_4_2, V4L2_MPEG_VIDEO_H264_LEVEL_4_2 },
> +       { VIRTIO_VIDEO_LEVEL_H264_5_0, V4L2_MPEG_VIDEO_H264_LEVEL_5_0 },
> +       { VIRTIO_VIDEO_LEVEL_H264_5_1, V4L2_MPEG_VIDEO_H264_LEVEL_5_1 },
> +       { 0 },
> +};
> +
> +uint32_t virtio_video_level_to_v4l2(uint32_t level)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(level_table); idx++) {
> +               if (level_table[idx].virtio_value == level)
> +                       return level_table[idx].v4l2_value;
> +       }
> +
> +       return 0;
> +}
> +
> +uint32_t virtio_video_v4l2_level_to_virtio(uint32_t v4l2_level)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(level_table); idx++) {
> +               if (level_table[idx].v4l2_value == v4l2_level)
> +                       return level_table[idx].virtio_value;
> +       }
> +
> +       return 0;
> +}
> +
> +static struct virtio_video_convert_table profile_table[] = {
> +       { VIRTIO_VIDEO_PROFILE_H264_BASELINE,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE },
> +       { VIRTIO_VIDEO_PROFILE_H264_MAIN, V4L2_MPEG_VIDEO_H264_PROFILE_MAIN },
> +       { VIRTIO_VIDEO_PROFILE_H264_EXTENDED,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED },
> +       { VIRTIO_VIDEO_PROFILE_H264_HIGH, V4L2_MPEG_VIDEO_H264_PROFILE_HIGH },
> +       { VIRTIO_VIDEO_PROFILE_H264_HIGH10PROFILE,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10 },
> +       { VIRTIO_VIDEO_PROFILE_H264_HIGH422PROFILE,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422},
> +       { VIRTIO_VIDEO_PROFILE_H264_HIGH444PREDICTIVEPROFILE,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE },
> +       { VIRTIO_VIDEO_PROFILE_H264_SCALABLEBASELINE,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE },
> +       { VIRTIO_VIDEO_PROFILE_H264_SCALABLEHIGH,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH },
> +       { VIRTIO_VIDEO_PROFILE_H264_STEREOHIGH,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH },
> +       { VIRTIO_VIDEO_PROFILE_H264_MULTIVIEWHIGH,
> +               V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH },
> +       { 0 },
> +};
> +
> +uint32_t virtio_video_profile_to_v4l2(uint32_t profile)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(profile_table); idx++) {
> +               if (profile_table[idx].virtio_value == profile)
> +                       return profile_table[idx].v4l2_value;
> +       }
> +
> +       return 0;
> +}
> +
> +uint32_t virtio_video_v4l2_profile_to_virtio(uint32_t v4l2_profile)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(profile_table); idx++) {
> +               if (profile_table[idx].v4l2_value == v4l2_profile)
> +                       return profile_table[idx].virtio_value;
> +       }
> +
> +       return 0;
> +}
> +
> +static struct virtio_video_convert_table format_table[] = {
> +       { VIRTIO_VIDEO_FORMAT_ARGB8888, V4L2_PIX_FMT_ARGB32 },
> +       { VIRTIO_VIDEO_FORMAT_BGRA8888, V4L2_PIX_FMT_ABGR32 },
> +       { VIRTIO_VIDEO_FORMAT_NV12, V4L2_PIX_FMT_NV12 },
> +       { VIRTIO_VIDEO_FORMAT_YUV420, V4L2_PIX_FMT_YUV420 },
> +       { VIRTIO_VIDEO_FORMAT_YVU420, V4L2_PIX_FMT_YVU420 },
> +       { VIRTIO_VIDEO_FORMAT_MPEG2, V4L2_PIX_FMT_MPEG2 },
> +       { VIRTIO_VIDEO_FORMAT_MPEG4, V4L2_PIX_FMT_MPEG4 },
> +       { VIRTIO_VIDEO_FORMAT_H264, V4L2_PIX_FMT_H264 },
> +       { VIRTIO_VIDEO_FORMAT_HEVC, V4L2_PIX_FMT_HEVC },
> +       { VIRTIO_VIDEO_FORMAT_VP8, V4L2_PIX_FMT_VP8 },
> +       { VIRTIO_VIDEO_FORMAT_VP9, V4L2_PIX_FMT_VP9 },
> +       { 0 },
> +};
> +
> +uint32_t virtio_video_format_to_v4l2(uint32_t format)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(format_table); idx++) {
> +               if (format_table[idx].virtio_value == format)
> +                       return format_table[idx].v4l2_value;
> +       }
> +
> +       return 0;
> +}
> +
> +uint32_t virtio_video_v4l2_format_to_virtio(uint32_t v4l2_format)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(format_table); idx++) {
> +               if (format_table[idx].v4l2_value == v4l2_format)
> +                       return format_table[idx].virtio_value;
> +       }
> +
> +       return 0;
> +}
> +
> +static struct virtio_video_convert_table control_table[] = {
> +       { VIRTIO_VIDEO_CONTROL_BITRATE, V4L2_CID_MPEG_VIDEO_BITRATE },
> +       { VIRTIO_VIDEO_CONTROL_PROFILE, V4L2_CID_MPEG_VIDEO_H264_PROFILE },
> +       { VIRTIO_VIDEO_CONTROL_LEVEL, V4L2_CID_MPEG_VIDEO_H264_LEVEL },
> +       { 0 },
> +};
> +
> +uint32_t virtio_video_control_to_v4l2(uint32_t control)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(control_table); idx++) {
> +               if (control_table[idx].virtio_value == control)
> +                       return control_table[idx].v4l2_value;
> +       }
> +
> +       return 0;
> +}
> +
> +uint32_t virtio_video_v4l2_control_to_virtio(uint32_t v4l2_control)
> +{
> +       size_t idx;
> +
> +       for (idx = 0; idx < ARRAY_SIZE(control_table); idx++) {
> +               if (control_table[idx].v4l2_value == v4l2_control)
> +                       return control_table[idx].virtio_value;
> +       }
> +
> +       return 0;
> +}
> +
> +uint32_t virtio_video_get_format_from_virtio_profile(uint32_t virtio_profile)
> +{
> +       if (virtio_profile >= VIRTIO_VIDEO_PROFILE_H264_MIN &&
> +           virtio_profile <= VIRTIO_VIDEO_PROFILE_H264_MAX)
> +               return VIRTIO_VIDEO_FORMAT_H264;
> +       else if (virtio_profile >= VIRTIO_VIDEO_PROFILE_HEVC_MIN &&
> +                virtio_profile <= VIRTIO_VIDEO_PROFILE_HEVC_MAX)
> +               return VIRTIO_VIDEO_FORMAT_HEVC;
> +       else if (virtio_profile >= VIRTIO_VIDEO_PROFILE_VP8_MIN &&
> +                virtio_profile <= VIRTIO_VIDEO_PROFILE_VP8_MAX)
> +               return VIRTIO_VIDEO_FORMAT_VP8;
> +       else if (virtio_profile >= VIRTIO_VIDEO_PROFILE_VP9_MIN &&
> +                virtio_profile <= VIRTIO_VIDEO_PROFILE_VP9_MAX)
> +               return VIRTIO_VIDEO_FORMAT_VP9;
> +
> +       return 0;
> +}
> +
> +struct video_format *find_video_format(struct list_head *fmts_list,
> +                                      uint32_t format)
> +{
> +       struct video_format *fmt = NULL;
> +
> +       list_for_each_entry(fmt, fmts_list, formats_list_entry) {
> +               if (fmt->desc.format == format)
> +                       return fmt;
> +       }
> +
> +       return NULL;
> +}
> +
> +void virtio_video_format_from_info(struct video_format_info *info,
> +                                  struct v4l2_pix_format_mplane *pix_mp)
> +{
> +       int i;
> +
> +       pix_mp->width = info->frame_width;
> +       pix_mp->height = info->frame_height;
> +       pix_mp->field = V4L2_FIELD_NONE;
> +       pix_mp->colorspace = V4L2_COLORSPACE_REC709;
> +       pix_mp->xfer_func = 0;
> +       pix_mp->ycbcr_enc = 0;
> +       pix_mp->quantization = 0;
> +       memset(pix_mp->reserved, 0, sizeof(pix_mp->reserved));
> +       memset(pix_mp->plane_fmt[0].reserved, 0,
> +              sizeof(pix_mp->plane_fmt[0].reserved));
> +
> +       pix_mp->num_planes = info->num_planes;
> +       pix_mp->pixelformat = info->fourcc_format;
> +
> +       for (i = 0; i < info->num_planes; i++) {
> +               pix_mp->plane_fmt[i].bytesperline =
> +                                        info->plane_format[i].stride;
> +               pix_mp->plane_fmt[i].sizeimage =
> +                                        info->plane_format[i].plane_size;
> +       }
> +}
> +
> +void virtio_video_format_fill_default_info(struct video_format_info *dst_info,
> +                                         struct video_format_info *src_info)
> +{
> +       memcpy(dst_info, src_info, sizeof(*dst_info));
> +}
> diff --git a/drivers/media/virtio/virtio_video_vq.c b/drivers/media/virtio/virtio_video_vq.c
> new file mode 100644
> index 000000000000..4679e6b49cf3
> --- /dev/null
> +++ b/drivers/media/virtio/virtio_video_vq.c
> @@ -0,0 +1,1012 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/* Driver for virtio video device.
> + *
> + * Copyright 2019 OpenSynergy GmbH.
> + *
> + * Based on drivers/gpu/drm/virtio/virtgpu_vq.c
> + * Copyright (C) 2015 Red Hat, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "virtio_video.h"
> +
> +#define MAX_INLINE_CMD_SIZE   298
> +#define MAX_INLINE_RESP_SIZE  298
> +#define VBUFFER_SIZE          (sizeof(struct virtio_video_vbuffer) \
> +                              + MAX_INLINE_CMD_SIZE               \
> +                              + MAX_INLINE_RESP_SIZE)
> +
> +void virtio_video_resource_id_get(struct virtio_video *vv, uint32_t *id)
> +{
> +       int handle;
> +
> +       idr_preload(GFP_KERNEL);
> +       spin_lock(&vv->resource_idr_lock);
> +       handle = idr_alloc(&vv->resource_idr, NULL, 1, 0, GFP_NOWAIT);
> +       spin_unlock(&vv->resource_idr_lock);
> +       idr_preload_end();
> +       *id = handle;
> +}
> +
> +void virtio_video_resource_id_put(struct virtio_video *vv, uint32_t id)
> +{
> +       spin_lock(&vv->resource_idr_lock);
> +       idr_remove(&vv->resource_idr, id);
> +       spin_unlock(&vv->resource_idr_lock);
> +}
> +
> +void virtio_video_stream_id_get(struct virtio_video *vv,
> +                               struct virtio_video_stream *stream,
> +                               uint32_t *id)
> +{
> +       int handle;
> +
> +       idr_preload(GFP_KERNEL);
> +       spin_lock(&vv->stream_idr_lock);
> +       handle = idr_alloc(&vv->stream_idr, stream, 1, 0, 0);
> +       spin_unlock(&vv->stream_idr_lock);
> +       idr_preload_end();
> +       *id = handle;
> +}
> +
> +void virtio_video_stream_id_put(struct virtio_video *vv, uint32_t id)
> +{
> +       spin_lock(&vv->stream_idr_lock);
> +       idr_remove(&vv->stream_idr, id);
> +       spin_unlock(&vv->stream_idr_lock);
> +}
> +
> +void virtio_video_cmd_ack(struct virtqueue *vq)
> +{
> +       struct virtio_video *vv = vq->vdev->priv;
> +
> +       schedule_work(&vv->commandq.dequeue_work);
> +}
> +
> +void virtio_video_event_ack(struct virtqueue *vq)
> +{
> +       struct virtio_video *vv = vq->vdev->priv;
> +
> +       schedule_work(&vv->eventq.dequeue_work);
> +}
> +
> +static struct virtio_video_vbuffer *
> +virtio_video_get_vbuf(struct virtio_video *vv, int size,
> +                     int resp_size, void *resp_buf,
> +                     virtio_video_resp_cb resp_cb)
> +{
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       vbuf = kmem_cache_alloc(vv->vbufs, GFP_KERNEL);
> +       if (!vbuf)
> +               return ERR_PTR(-ENOMEM);
> +       memset(vbuf, 0, VBUFFER_SIZE);
> +
> +       BUG_ON(size > MAX_INLINE_CMD_SIZE);
> +       vbuf->buf = (void *)vbuf + sizeof(*vbuf);
> +       vbuf->size = size;
> +
> +       vbuf->resp_cb = resp_cb;
> +       vbuf->resp_size = resp_size;
> +       if (resp_size <= MAX_INLINE_RESP_SIZE && !resp_buf)
> +               vbuf->resp_buf = (void *)vbuf->buf + size;
> +       else
> +               vbuf->resp_buf = resp_buf;
> +       BUG_ON(!vbuf->resp_buf);
> +
> +       return vbuf;
> +}
> +
> +static void free_vbuf(struct virtio_video *vv,
> +                     struct virtio_video_vbuffer *vbuf)
> +{
> +       if (!vbuf->resp_cb &&
> +           vbuf->resp_size > MAX_INLINE_RESP_SIZE)
> +               kfree(vbuf->resp_buf);
> +       kfree(vbuf->data_buf);
> +       kmem_cache_free(vv->vbufs, vbuf);
> +}
> +
> +static void reclaim_vbufs(struct virtqueue *vq, struct list_head *reclaim_list)
> +{
> +       struct virtio_video_vbuffer *vbuf;
> +       unsigned int len;
> +       struct virtio_video *vv = vq->vdev->priv;
> +       int freed = 0;
> +
> +       while ((vbuf = virtqueue_get_buf(vq, &len))) {
> +               list_add_tail(&vbuf->list, reclaim_list);
> +               freed++;
> +       }
> +       if (freed == 0)
> +               v4l2_dbg(1, vv->debug, &vv->v4l2_dev,
> +                        "zero vbufs reclaimed\n");
> +}
> +
> +static void detach_vbufs(struct virtqueue *vq, struct list_head *detach_list)
> +{
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       while ((vbuf = virtqueue_detach_unused_buf(vq)) != NULL)
> +               list_add_tail(&vbuf->list, detach_list);
> +}
> +
> +static void virtio_video_deatch_vbufs(struct virtio_video *vv)
> +{
> +       struct list_head detach_list;
> +       struct virtio_video_vbuffer *entry, *tmp;
> +
> +       INIT_LIST_HEAD(&detach_list);
> +
> +       detach_vbufs(vv->eventq.vq, &detach_list);
> +       detach_vbufs(vv->commandq.vq, &detach_list);
> +
> +       if (list_empty(&detach_list))
> +               return;
> +
> +       list_for_each_entry_safe(entry, tmp, &detach_list, list) {
> +               list_del(&entry->list);
> +               free_vbuf(vv, entry);
> +       }
> +}
> +
> +int virtio_video_alloc_vbufs(struct virtio_video *vv)
> +{
> +       vv->vbufs =
> +               kmem_cache_create("virtio-video-vbufs", VBUFFER_SIZE,
> +                                 __alignof__(struct virtio_video_vbuffer), 0,
> +                                 NULL);
> +       if (!vv->vbufs)
> +               return -ENOMEM;
> +
> +       return 0;
> +}
> +
> +void virtio_video_free_vbufs(struct virtio_video *vv)
> +{
> +       virtio_video_deatch_vbufs(vv);
> +       kmem_cache_destroy(vv->vbufs);
> +       vv->vbufs = NULL;
> +}
> +
> +static void *virtio_video_alloc_req(struct virtio_video *vv,
> +                                   struct virtio_video_vbuffer **vbuffer_p,
> +                                   int size)
> +{
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       vbuf = virtio_video_get_vbuf(vv, size,
> +                                    sizeof(struct virtio_video_cmd_hdr),
> +                                    NULL, NULL);
> +       if (IS_ERR(vbuf)) {
> +               *vbuffer_p = NULL;
> +               return ERR_CAST(vbuf);
> +       }
> +       *vbuffer_p = vbuf;
> +
> +       return vbuf->buf;
> +}
> +
> +static void *
> +virtio_video_alloc_req_resp(struct virtio_video *vv,
> +                           virtio_video_resp_cb cb,
> +                           struct virtio_video_vbuffer **vbuffer_p,
> +                           int req_size, int resp_size,
> +                           void *resp_buf)
> +{
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       vbuf = virtio_video_get_vbuf(vv, req_size, resp_size, resp_buf, cb);
> +       if (IS_ERR(vbuf)) {
> +               *vbuffer_p = NULL;
> +               return ERR_CAST(vbuf);
> +       }
> +       *vbuffer_p = vbuf;
> +
> +       return vbuf->buf;
> +}
> +
> +void virtio_video_dequeue_cmd_func(struct work_struct *work)
> +{
> +       struct virtio_video *vv =
> +               container_of(work, struct virtio_video,
> +                            commandq.dequeue_work);
> +       struct list_head reclaim_list;
> +       struct virtio_video_vbuffer *entry, *tmp;
> +       struct virtio_video_cmd_hdr *resp;
> +
> +       INIT_LIST_HEAD(&reclaim_list);
> +       spin_lock(&vv->commandq.qlock);
> +       do {
> +               virtqueue_disable_cb(vv->commandq.vq);
> +               reclaim_vbufs(vv->commandq.vq, &reclaim_list);
> +
> +       } while (!virtqueue_enable_cb(vv->commandq.vq));
> +       spin_unlock(&vv->commandq.qlock);
> +
> +       list_for_each_entry_safe(entry, tmp, &reclaim_list, list) {
> +               resp = (struct virtio_video_cmd_hdr *)entry->resp_buf;
> +               if (resp->type >=
> +                   cpu_to_le32(VIRTIO_VIDEO_RESP_ERR_INVALID_OPERATION))
> +                       v4l2_dbg(1, vv->debug, &vv->v4l2_dev,
> +                                "response 0x%x\n", le32_to_cpu(resp->type));
> +               if (entry->resp_cb)
> +                       entry->resp_cb(vv, entry);
> +
> +               list_del(&entry->list);
> +               free_vbuf(vv, entry);
> +       }
> +       wake_up(&vv->commandq.ack_queue);
> +}
> +
> +void virtio_video_dequeue_event_func(struct work_struct *work)
> +{
> +       struct virtio_video *vv =
> +               container_of(work, struct virtio_video,
> +                            eventq.dequeue_work);
> +       struct list_head reclaim_list;
> +       struct virtio_video_vbuffer *entry, *tmp;
> +
> +       INIT_LIST_HEAD(&reclaim_list);
> +       spin_lock(&vv->eventq.qlock);
> +       do {
> +               virtqueue_disable_cb(vv->eventq.vq);
> +               reclaim_vbufs(vv->eventq.vq, &reclaim_list);
> +
> +       } while (!virtqueue_enable_cb(vv->eventq.vq));
> +       spin_unlock(&vv->eventq.qlock);
> +
> +       list_for_each_entry_safe(entry, tmp, &reclaim_list, list) {
> +               entry->resp_cb(vv, entry);
> +               list_del(&entry->list);
> +       }
> +       wake_up(&vv->eventq.ack_queue);
> +}
> +
> +static int
> +virtio_video_queue_cmd_buffer_locked(struct virtio_video *vv,
> +                                     struct virtio_video_vbuffer *vbuf)
> +{
> +       struct virtqueue *vq = vv->commandq.vq;
> +       struct scatterlist *sgs[3], vreq, vout, vresp;
> +       int outcnt = 0, incnt = 0;
> +       int ret;
> +
> +       if (!vv->vq_ready)
> +               return -ENODEV;
> +
> +       sg_init_one(&vreq, vbuf->buf, vbuf->size);
> +       sgs[outcnt + incnt] = &vreq;
> +       outcnt++;
> +
> +       if (vbuf->data_size) {
> +               sg_init_one(&vout, vbuf->data_buf, vbuf->data_size);
> +               sgs[outcnt + incnt] = &vout;
> +               outcnt++;
> +       }
> +
> +       if (vbuf->resp_size) {
> +               sg_init_one(&vresp, vbuf->resp_buf, vbuf->resp_size);
> +               sgs[outcnt + incnt] = &vresp;
> +               incnt++;
> +       }
> +
> +retry:
> +       ret = virtqueue_add_sgs(vq, sgs, outcnt, incnt, vbuf, GFP_ATOMIC);
> +       if (ret == -ENOSPC) {
> +               spin_unlock(&vv->commandq.qlock);
> +               wait_event(vv->commandq.ack_queue, vq->num_free);
> +               spin_lock(&vv->commandq.qlock);
> +               goto retry;
> +       } else {
> +               virtqueue_kick(vq);
> +       }
> +
> +       return ret;
> +}
> +
> +static int virtio_video_queue_cmd_buffer(struct virtio_video *vv,
> +                                         struct virtio_video_vbuffer *vbuf)
> +{
> +       int ret;
> +
> +       spin_lock(&vv->commandq.qlock);
> +       ret = virtio_video_queue_cmd_buffer_locked(vv, vbuf);
> +       spin_unlock(&vv->commandq.qlock);
> +
> +       return ret;
> +}
> +
> +static int virtio_video_queue_event_buffer(struct virtio_video *vv,
> +                                          struct virtio_video_vbuffer *vbuf)
> +{
> +       int ret;
> +       struct scatterlist vresp;
> +       struct virtqueue *vq = vv->eventq.vq;
> +
> +       spin_lock(&vv->eventq.qlock);
> +       sg_init_one(&vresp, vbuf->resp_buf, vbuf->resp_size);
> +       ret = virtqueue_add_inbuf(vq, &vresp, 1, vbuf, GFP_ATOMIC);
> +       spin_unlock(&vv->eventq.qlock);
> +       if (ret)
> +               return ret;
> +
> +       virtqueue_kick(vq);
> +
> +       return 0;
> +}
> +
> +static void virtio_video_event_cb(struct virtio_video *vv,
> +                                 struct virtio_video_vbuffer *vbuf)
> +{
> +       int ret;
> +       struct virtio_video_stream *stream;
> +       struct virtio_video_event *event =
> +               (struct virtio_video_event *)vbuf->resp_buf;
> +
> +       stream = idr_find(&vv->stream_idr, event->stream_id);
> +       if (!stream) {
> +               v4l2_warn(&vv->v4l2_dev, "no stream %u found for event\n",
> +                         event->stream_id);
> +               return;
> +       }
> +
> +       switch (le32_to_cpu(event->event_type)) {
> +       case VIRTIO_VIDEO_EVENT_DECODER_RESOLUTION_CHANGED:
> +               virtio_video_cmd_get_params(vv, stream,
> +                                          VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT);
> +               virtio_video_queue_res_chg_event(stream);
> +               if (stream->state == STREAM_STATE_INIT) {
> +                       stream->state = STREAM_STATE_METADATA;
> +                       wake_up(&vv->wq);
> +               }
> +               break;
> +       default:
> +               v4l2_warn(&vv->v4l2_dev, "failed to queue event buffer\n");
> +               break;
> +       }
> +
> +       memset(vbuf->resp_buf, 0, vbuf->resp_size);
> +       ret = virtio_video_queue_event_buffer(vv, vbuf);
> +       if (ret)
> +               v4l2_warn(&vv->v4l2_dev, "queue event buffer failed\n");
> +}
> +
> +int virtio_video_alloc_events(struct virtio_video *vv, size_t num)
> +{
> +       int ret;
> +       size_t i;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       for (i = 0; i < num; i++) {
> +               vbuf = virtio_video_get_vbuf(vv, 0,
> +                                            sizeof(struct virtio_video_event),
> +                                            NULL, virtio_video_event_cb);
> +               if (IS_ERR(vbuf))
> +                       return PTR_ERR(vbuf);
> +
> +               ret = virtio_video_queue_event_buffer(vv, vbuf);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       return 0;
> +}
> +
> +int virtio_video_cmd_stream_create(struct virtio_video *vv, uint32_t stream_id,
> +                                  enum virtio_video_format format,
> +                                  const char *tag)
> +{
> +       struct virtio_video_stream_create *req_p;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       req_p = virtio_video_alloc_req(vv, &vbuf, sizeof(*req_p));
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_STREAM_CREATE);
> +       req_p->hdr.stream_id = cpu_to_le32(stream_id);
> +       req_p->in_mem_type = cpu_to_le32(VIRTIO_VIDEO_MEM_TYPE_GUEST_PAGES);
> +       req_p->out_mem_type = cpu_to_le32(VIRTIO_VIDEO_MEM_TYPE_GUEST_PAGES);
> +       req_p->coded_format = cpu_to_le32(format);
> +       strncpy(req_p->tag, tag, sizeof(req_p->tag) - 1);
> +       req_p->tag[sizeof(req_p->tag) - 1] = 0;
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +int virtio_video_cmd_stream_destroy(struct virtio_video *vv, uint32_t stream_id)
> +{
> +       struct virtio_video_stream_destroy *req_p;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       req_p = virtio_video_alloc_req(vv, &vbuf, sizeof(*req_p));
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_STREAM_DESTROY);
> +       req_p->hdr.stream_id = cpu_to_le32(stream_id);
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +int virtio_video_cmd_stream_drain(struct virtio_video *vv, uint32_t stream_id)
> +{
> +       struct virtio_video_stream_drain *req_p;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       req_p = virtio_video_alloc_req(vv, &vbuf, sizeof(*req_p));
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_STREAM_DRAIN);
> +       req_p->hdr.stream_id = cpu_to_le32(stream_id);
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +int virtio_video_cmd_resource_create(struct virtio_video *vv,
> +                                    uint32_t stream_id, uint32_t resource_id,
> +                                    uint32_t queue_type,
> +                                    struct virtio_video_mem_entry *ents,
> +                                    unsigned int num_planes,
> +                                    unsigned int *num_entry)
> +{
> +       unsigned int i = 0, nents = 0;
> +       struct virtio_video_resource_create *req_p;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       req_p = virtio_video_alloc_req(vv, &vbuf, sizeof(*req_p));
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_RESOURCE_CREATE);
> +       req_p->hdr.stream_id = cpu_to_le32(stream_id);
> +       req_p->resource_id = cpu_to_le32(resource_id);
> +       req_p->queue_type = cpu_to_le32(queue_type);
> +        req_p->num_planes = cpu_to_le32(num_planes);
> +
> +       for (i = 0; i < num_planes; i++) {
> +               nents += num_entry[i];
> +               req_p->num_entries[i] = cpu_to_le32(num_entry[i]);
> +       }
> +
> +       vbuf->data_buf = ents;
> +       vbuf->data_size = sizeof(*ents) * nents;
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +int virtio_video_cmd_resource_destroy_all(struct virtio_video *vv,
> +                                         struct virtio_video_stream *stream,
> +                                         enum virtio_video_queue_type qtype)
> +{
> +       struct virtio_video_resource_destroy_all *req_p;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       req_p = virtio_video_alloc_req(vv, &vbuf, sizeof(*req_p));
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_RESOURCE_DESTROY_ALL);
> +       req_p->hdr.stream_id = cpu_to_le32(stream->stream_id);
> +       req_p->queue_type = cpu_to_le32(qtype);
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +static void
> +virtio_video_cmd_resource_queue_cb(struct virtio_video *vv,
> +                                  struct virtio_video_vbuffer *vbuf)
> +{
> +       uint32_t flags, bytesused;
> +       uint64_t timestamp;
> +       struct virtio_video_buffer *virtio_vb = vbuf->priv;
> +       struct virtio_video_resource_queue_resp *resp =
> +               (struct virtio_video_resource_queue_resp *)vbuf->resp_buf;
> +
> +       flags = le32_to_cpu(resp->flags);
> +       bytesused = le32_to_cpu(resp->size);
> +       timestamp = le64_to_cpu(resp->timestamp);
> +
> +       virtio_video_buf_done(virtio_vb, flags, timestamp, bytesused);
> +}
> +
> +int virtio_video_cmd_resource_queue(struct virtio_video *vv, uint32_t stream_id,
> +                                   struct virtio_video_buffer *virtio_vb,
> +                                   uint32_t data_size[],
> +                                   uint8_t num_data_size, uint32_t queue_type)
> +{
> +       uint8_t i;
> +       struct virtio_video_resource_queue *req_p;
> +       struct virtio_video_resource_queue_resp *resp_p;
> +       struct virtio_video_vbuffer *vbuf;
> +       size_t resp_size = sizeof(struct virtio_video_resource_queue_resp);
> +
> +       req_p = virtio_video_alloc_req_resp(vv,
> +                                           &virtio_video_cmd_resource_queue_cb,
> +                                           &vbuf, sizeof(*req_p), resp_size,
> +                                           NULL);
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_RESOURCE_QUEUE);
> +       req_p->hdr.stream_id = cpu_to_le32(stream_id);
> +       req_p->queue_type = cpu_to_le32(queue_type);
> +       req_p->resource_id = cpu_to_le32(virtio_vb->resource_id);
> +       req_p->num_data_sizes = num_data_size;
> +       req_p->timestamp =
> +               cpu_to_le64(virtio_vb->v4l2_m2m_vb.vb.vb2_buf.timestamp);
> +
> +       for (i = 0; i < num_data_size; ++i)
> +               req_p->data_sizes[i] = cpu_to_le32(data_size[i]);
> +
> +       resp_p = (struct virtio_video_resource_queue_resp *)vbuf->resp_buf;
> +       memset(resp_p, 0, sizeof(*resp_p));
> +
> +       vbuf->priv = virtio_vb;
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +static void
> +virtio_video_cmd_queue_clear_cb(struct virtio_video *vv,
> +                               struct virtio_video_vbuffer *vbuf)
> +{
> +       struct virtio_video_stream *stream = vbuf->priv;
> +       struct virtio_video_queue_clear *req_p =
> +               (struct virtio_video_queue_clear *)vbuf->buf;
> +
> +       if (le32_to_cpu(req_p->queue_type) == VIRTIO_VIDEO_QUEUE_TYPE_INPUT)
> +               stream->src_cleared = true;
> +       else
> +               stream->dst_cleared = true;
> +
> +       wake_up(&vv->wq);
> +}
> +
> +int virtio_video_cmd_queue_clear(struct virtio_video *vv,
> +                                struct virtio_video_stream *stream,
> +                                uint32_t queue_type)
> +{
> +       struct virtio_video_queue_clear *req_p;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       req_p = virtio_video_alloc_req_resp
> +               (vv, &virtio_video_cmd_queue_clear_cb,
> +                &vbuf, sizeof(*req_p),
> +                sizeof(struct virtio_video_cmd_hdr), NULL);
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_QUEUE_CLEAR);
> +       req_p->hdr.stream_id = cpu_to_le32(stream->stream_id);
> +       req_p->queue_type = cpu_to_le32(queue_type);
> +
> +       vbuf->priv = stream;
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +static void
> +virtio_video_query_caps_cb(struct virtio_video *vv,
> +                          struct virtio_video_vbuffer *vbuf)
> +{
> +       bool *got_resp_p = vbuf->priv;
> +       *got_resp_p = true;
> +       wake_up(&vv->wq);
> +}
> +
> +int virtio_video_query_capability(struct virtio_video *vv, void *resp_buf,
> +                                 size_t resp_size, uint32_t queue_type)
> +{
> +       struct virtio_video_query_capability *req_p = NULL;
> +       struct virtio_video_vbuffer *vbuf = NULL;
> +
> +       if (!vv || !resp_buf)
> +               return -1;
> +
> +       req_p = virtio_video_alloc_req_resp(vv, &virtio_video_query_caps_cb,
> +                                           &vbuf, sizeof(*req_p), resp_size,
> +                                           resp_buf);
> +       if (IS_ERR(req_p))
> +               return -1;
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_QUERY_CAPABILITY);
> +       req_p->queue_type = cpu_to_le32(queue_type);
> +
> +       vbuf->priv = &vv->got_caps;
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +int virtio_video_query_control_level(struct virtio_video *vv, void *resp_buf,
> +                                    size_t resp_size, uint32_t format)
> +{
> +       struct virtio_video_query_control *req_p = NULL;
> +       struct virtio_video_query_control_level *ctrl_l = NULL;
> +       struct virtio_video_vbuffer *vbuf = NULL;
> +       uint32_t req_size = 0;
> +
> +       if (!vv || !resp_buf)
> +               return -1;
> +
> +       req_size = sizeof(struct virtio_video_query_control) +
> +               sizeof(struct virtio_video_query_control_level);
> +
> +       req_p = virtio_video_alloc_req_resp(vv, &virtio_video_query_caps_cb,
> +                                           &vbuf, req_size, resp_size,
> +                                           resp_buf);
> +       if (IS_ERR(req_p))
> +               return -1;
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_QUERY_CONTROL);
> +       req_p->control = cpu_to_le32(VIRTIO_VIDEO_CONTROL_LEVEL);
> +       ctrl_l = (void *)((char *)req_p +
> +                         sizeof(struct virtio_video_query_control));
> +       ctrl_l->format = cpu_to_le32(format);
> +
> +       vbuf->priv = &vv->got_control;
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +int virtio_video_query_control_profile(struct virtio_video *vv, void *resp_buf,
> +                                      size_t resp_size, uint32_t format)
> +{
> +       struct virtio_video_query_control *req_p = NULL;
> +       struct virtio_video_query_control_profile *ctrl_p = NULL;
> +       struct virtio_video_vbuffer *vbuf = NULL;
> +       uint32_t req_size = 0;
> +
> +       if (!vv || !resp_buf)
> +               return -1;
> +
> +       req_size = sizeof(struct virtio_video_query_control) +
> +               sizeof(struct virtio_video_query_control_profile);
> +
> +       req_p = virtio_video_alloc_req_resp(vv, &virtio_video_query_caps_cb,
> +                                           &vbuf, req_size, resp_size,
> +                                           resp_buf);
> +       if (IS_ERR(req_p))
> +               return -1;
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_QUERY_CONTROL);
> +       req_p->control = cpu_to_le32(VIRTIO_VIDEO_CONTROL_PROFILE);
> +       ctrl_p = (void *)((char *)req_p +
> +                         sizeof(struct virtio_video_query_control));
> +       ctrl_p->format = cpu_to_le32(format);
> +
> +       vbuf->priv = &vv->got_control;
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +static void
> +virtio_video_cmd_get_params_cb(struct virtio_video *vv,
> +                              struct virtio_video_vbuffer *vbuf)
> +{
> +       int i;
> +       struct virtio_video_get_params_resp *resp =
> +               (struct virtio_video_get_params_resp *)vbuf->resp_buf;
> +       struct virtio_video_params *params = &resp->params;
> +       struct virtio_video_stream *stream = vbuf->priv;
> +       enum virtio_video_queue_type queue_type;
> +       struct video_format_info *format_info = NULL;
> +
> +       queue_type = le32_to_cpu(params->queue_type);
> +       if (queue_type == VIRTIO_VIDEO_QUEUE_TYPE_INPUT)
> +               format_info = &stream->in_info;
> +       else
> +               format_info = &stream->out_info;
> +
> +       if (!format_info)
> +               return;
> +
> +       format_info->frame_rate = le32_to_cpu(params->frame_rate);
> +       format_info->frame_width = le32_to_cpu(params->frame_width);
> +       format_info->frame_height = le32_to_cpu(params->frame_height);
> +       format_info->min_buffers = le32_to_cpu(params->min_buffers);
> +       format_info->max_buffers = le32_to_cpu(params->max_buffers);
> +       format_info->fourcc_format =
> +               virtio_video_format_to_v4l2(le32_to_cpu(params->format));
> +
> +       format_info->crop.top = le32_to_cpu(params->crop.top);
> +       format_info->crop.left = le32_to_cpu(params->crop.left);
> +       format_info->crop.width = le32_to_cpu(params->crop.width);
> +       format_info->crop.height = le32_to_cpu(params->crop.height);
> +
> +       format_info->num_planes = le32_to_cpu(params->num_planes);
> +       for (i = 0; i < le32_to_cpu(params->num_planes); i++) {
> +               struct virtio_video_plane_format *plane_formats =
> +                                                &params->plane_formats[i];
> +               struct video_plane_format *plane_format =
> +                                                &format_info->plane_format[i];
> +
> +               plane_format->plane_size =
> +                                le32_to_cpu(plane_formats->plane_size);
> +               plane_format->stride = le32_to_cpu(plane_formats->stride);
> +       }
> +
> +       format_info->is_updated = true;
> +       wake_up(&vv->wq);
> +}
> +
> +int virtio_video_cmd_get_params(struct virtio_video *vv,
> +                              struct virtio_video_stream *stream,
> +                              uint32_t queue_type)
> +{
> +       int ret;
> +       struct virtio_video_get_params *req_p = NULL;
> +       struct virtio_video_vbuffer *vbuf = NULL;
> +       struct virtio_video_get_params_resp *resp_p;
> +       struct video_format_info *format_info = NULL;
> +       size_t resp_size = sizeof(struct virtio_video_get_params_resp);
> +
> +       if (!vv || !stream)
> +               return -1;
> +
> +       req_p = virtio_video_alloc_req_resp(vv,
> +                                       &virtio_video_cmd_get_params_cb,
> +                                       &vbuf, sizeof(*req_p), resp_size,
> +                                       NULL);
> +
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_GET_PARAMS);
> +       req_p->hdr.stream_id = cpu_to_le32(stream->stream_id);
> +       req_p->queue_type = cpu_to_le32(queue_type);
> +
> +       resp_p = (struct virtio_video_get_params_resp *)vbuf->resp_buf;
> +       memset(resp_p, 0, sizeof(*resp_p));
> +
> +       if (req_p->queue_type == VIRTIO_VIDEO_QUEUE_TYPE_INPUT)
> +               format_info = &stream->in_info;
> +       else
> +               format_info = &stream->out_info;
> +
> +       format_info->is_updated = false;
> +
> +       vbuf->priv = stream;
> +       ret = virtio_video_queue_cmd_buffer(vv, vbuf);
> +       if (ret)
> +               return ret;
> +
> +       ret = wait_event_timeout(vv->wq,
> +                                format_info->is_updated, 5 * HZ);
> +       if (ret == 0) {
> +               v4l2_err(&vv->v4l2_dev, "timed out waiting for get_params\n");
> +               return -1;
> +       }
> +       return 0;
> +}
> +
> +int
> +virtio_video_cmd_set_params(struct virtio_video *vv,
> +                           struct virtio_video_stream *stream,
> +                           struct video_format_info *format_info,
> +                           uint32_t queue_type)
> +{
> +       int i;
> +       struct virtio_video_set_params *req_p;
> +       struct virtio_video_vbuffer *vbuf;
> +
> +       req_p = virtio_video_alloc_req(vv, &vbuf, sizeof(*req_p));
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_SET_PARAMS);
> +       req_p->hdr.stream_id = cpu_to_le32(stream->stream_id);
> +       req_p->params.queue_type = cpu_to_le32(queue_type);
> +       req_p->params.frame_rate = cpu_to_le32(format_info->frame_rate);
> +       req_p->params.frame_width = cpu_to_le32(format_info->frame_width);
> +       req_p->params.frame_height = cpu_to_le32(format_info->frame_height);
> +       req_p->params.format = virtio_video_v4l2_format_to_virtio(
> +                                cpu_to_le32(format_info->fourcc_format));
> +       req_p->params.min_buffers = cpu_to_le32(format_info->min_buffers);
> +       req_p->params.max_buffers = cpu_to_le32(format_info->max_buffers);
> +       req_p->params.num_planes = cpu_to_le32(format_info->num_planes);
> +
> +       for (i = 0; i < format_info->num_planes; i++) {
> +               struct virtio_video_plane_format *plane_formats =
> +                       &req_p->params.plane_formats[i];
> +               struct video_plane_format *plane_format =
> +                       &format_info->plane_format[i];
> +               plane_formats->plane_size =
> +                                cpu_to_le32(plane_format->plane_size);
> +               plane_formats->stride = cpu_to_le32(plane_format->stride);
> +       }
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> +static void
> +virtio_video_cmd_get_ctrl_profile_cb(struct virtio_video *vv,
> +                                    struct virtio_video_vbuffer *vbuf)
> +{
> +       struct virtio_video_get_control_resp *resp =
> +               (struct virtio_video_get_control_resp *)vbuf->resp_buf;
> +       struct virtio_video_control_val_profile *resp_p = NULL;
> +       struct virtio_video_stream *stream = vbuf->priv;
> +       struct video_control_info *control = &stream->control;
> +
> +       if (!control)
> +               return;
> +
> +       resp_p = (void *)((char *) resp +
> +                         sizeof(struct virtio_video_get_control_resp));
> +
> +       control->profile = le32_to_cpu(resp_p->profile);
> +       control->is_updated = true;
> +       wake_up(&vv->wq);
> +}
> +
> +static void
> +virtio_video_cmd_get_ctrl_level_cb(struct virtio_video *vv,
> +                                  struct virtio_video_vbuffer *vbuf)
> +{
> +       struct virtio_video_get_control_resp *resp =
> +               (struct virtio_video_get_control_resp *)vbuf->resp_buf;
> +       struct virtio_video_control_val_level *resp_p = NULL;
> +       struct virtio_video_stream *stream = vbuf->priv;
> +       struct video_control_info *control = &stream->control;
> +
> +       if (!control)
> +               return;
> +
> +       resp_p = (void *)((char *)resp +
> +                         sizeof(struct virtio_video_get_control_resp));
> +
> +       control->level = le32_to_cpu(resp_p->level);
> +       control->is_updated = true;
> +       wake_up(&vv->wq);
> +}
> +
> +static void
> +virtio_video_cmd_get_ctrl_bitrate_cb(struct virtio_video *vv,
> +                                    struct virtio_video_vbuffer *vbuf)
> +{
> +       struct virtio_video_get_control_resp *resp =
> +               (struct virtio_video_get_control_resp *)vbuf->resp_buf;
> +       struct virtio_video_control_val_bitrate *resp_p = NULL;
> +       struct virtio_video_stream *stream = vbuf->priv;
> +       struct video_control_info *control = &stream->control;
> +
> +       if (!control)
> +               return;
> +
> +       resp_p = (void *)((char *) resp +
> +                         sizeof(struct virtio_video_get_control_resp));
> +
> +       control->bitrate = le32_to_cpu(resp_p->bitrate);
> +       control->is_updated = true;
> +       wake_up(&vv->wq);
> +}
> +
> +int virtio_video_cmd_get_control(struct virtio_video *vv,
> +                                struct virtio_video_stream *stream,
> +                                uint32_t virtio_ctrl)
> +{
> +       int ret = 0;
> +       struct virtio_video_get_control *req_p = NULL;
> +       struct virtio_video_get_control_resp *resp_p = NULL;
> +       struct virtio_video_vbuffer *vbuf = NULL;
> +       size_t resp_size = sizeof(struct virtio_video_get_control_resp);
> +       virtio_video_resp_cb cb;
> +
> +       if (!vv)
> +               return -1;
> +
> +       switch (virtio_ctrl) {
> +       case VIRTIO_VIDEO_CONTROL_PROFILE:
> +               resp_size += sizeof(struct virtio_video_control_val_profile);
> +               cb = &virtio_video_cmd_get_ctrl_profile_cb;
> +               break;
> +       case VIRTIO_VIDEO_CONTROL_LEVEL:
> +               resp_size += sizeof(struct virtio_video_control_val_level);
> +               cb = &virtio_video_cmd_get_ctrl_level_cb;
> +               break;
> +       case VIRTIO_VIDEO_CONTROL_BITRATE:
> +               resp_size += sizeof(struct virtio_video_control_val_bitrate);
> +               cb = &virtio_video_cmd_get_ctrl_bitrate_cb;
> +               break;
> +       default:
> +               return -1;
> +       }
> +
> +       req_p = virtio_video_alloc_req_resp(vv, cb, &vbuf,
> +                                           sizeof(*req_p), resp_size, NULL);
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_GET_CONTROL);
> +       req_p->hdr.stream_id = cpu_to_le32(stream->stream_id);
> +       req_p->control = cpu_to_le32(virtio_ctrl);
> +
> +       resp_p = (struct virtio_video_get_control_resp *)vbuf->resp_buf;
> +       memset(resp_p, 0, resp_size);
> +
> +       stream->control.is_updated = false;
> +
> +       vbuf->priv = stream;
> +       ret = virtio_video_queue_cmd_buffer(vv, vbuf);
> +       if (ret)
> +               return ret;
> +
> +       ret = wait_event_timeout(vv->wq, stream->control.is_updated, 5 * HZ);
> +       if (ret == 0) {
> +               v4l2_err(&vv->v4l2_dev, "timed out waiting for get_params\n");
> +               return -1;
> +       }
> +       return 0;
> +}
> +
> +int virtio_video_cmd_set_control(struct virtio_video *vv, uint32_t stream_id,
> +                                uint32_t control, uint32_t value)
> +{
> +       struct virtio_video_set_control *req_p = NULL;
> +       struct virtio_video_vbuffer *vbuf = NULL;
> +       struct virtio_video_control_val_level *ctrl_l = NULL;
> +       struct virtio_video_control_val_profile *ctrl_p = NULL;
> +       struct virtio_video_control_val_bitrate *ctrl_b = NULL;
> +       size_t size;
> +
> +       if (!vv || value == 0)
> +               return -EINVAL;
> +
> +       switch (control) {
> +       case VIRTIO_VIDEO_CONTROL_PROFILE:
> +               size = sizeof(struct virtio_video_control_val_profile);
> +               break;
> +       case VIRTIO_VIDEO_CONTROL_LEVEL:
> +               size = sizeof(struct virtio_video_control_val_level);
> +               break;
> +       case VIRTIO_VIDEO_CONTROL_BITRATE:
> +               size = sizeof(struct virtio_video_control_val_bitrate);
> +               break;
> +       default:
> +               return -1;
> +       }
> +
> +       req_p = virtio_video_alloc_req(vv, &vbuf, size + sizeof(*req_p));
> +       if (IS_ERR(req_p))
> +               return PTR_ERR(req_p);
> +
> +       req_p->hdr.type = cpu_to_le32(VIRTIO_VIDEO_CMD_SET_CONTROL);
> +       req_p->hdr.stream_id = cpu_to_le32(stream_id);
> +       req_p->control = cpu_to_le32(control);
> +
> +       switch (control) {
> +       case VIRTIO_VIDEO_CONTROL_PROFILE:
> +               ctrl_p = (void *)((char *)req_p +
> +                                 sizeof(struct virtio_video_set_control));
> +               ctrl_p->profile = cpu_to_le32(value);
> +               break;
> +       case VIRTIO_VIDEO_CONTROL_LEVEL:
> +               ctrl_l = (void *)((char *)req_p +
> +                                sizeof(struct virtio_video_set_control));
> +               ctrl_l->level = cpu_to_le32(value);
> +               break;
> +       case VIRTIO_VIDEO_CONTROL_BITRATE:
> +               ctrl_b = (void *)((char *)req_p +
> +                                sizeof(struct virtio_video_set_control));
> +               ctrl_b->bitrate = cpu_to_le32(value);
> +               break;
> +       }
> +
> +       return virtio_video_queue_cmd_buffer(vv, vbuf);
> +}
> +
> diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h
> index 6d5c3b2d4f4d..89dfc94ecaa3 100644
> --- a/include/uapi/linux/virtio_ids.h
> +++ b/include/uapi/linux/virtio_ids.h
> @@ -43,5 +43,7 @@
>  #define VIRTIO_ID_INPUT        18 /* virtio input */
>  #define VIRTIO_ID_VSOCK        19 /* virtio vsock transport */
>  #define VIRTIO_ID_CRYPTO       20 /* virtio crypto */
> +#define VIRTIO_ID_VIDEO_ENC    30 /* virtio video encoder */
> +#define VIRTIO_ID_VIDEO_DEC    31 /* virtio video decoder */
>
>  #endif /* _LINUX_VIRTIO_IDS_H */
> diff --git a/include/uapi/linux/virtio_video.h b/include/uapi/linux/virtio_video.h
> new file mode 100644
> index 000000000000..0dd98a2237c6
> --- /dev/null
> +++ b/include/uapi/linux/virtio_video.h
> @@ -0,0 +1,469 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */

I suspect it's not expected to use GPL licence without exceptions in a
UAPI header file:
https://www.kernel.org/doc/html/v5.4/process/license-rules.html

If GPL is used here, only GPL user programs can include this header
file, can't they?
So, can we use BSD licence like other virtio headers (e.g. virtio_gpu.h)?

Note that I found this program when running
/scripts/headers_install.sh. Though it suggested to add "WITH
Linux-syscall-note", it shouldn't be the case because this header
doesn't provide syscall interface.

Best regards,
Keiichi

> +/*
> + * Virtio Video Device
> + *
> + * This header is BSD licensed so anyone can use the definitions
> + * to implement compatible drivers/servers:
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the name of IBM nor the names of its contributors
> + *    may be used to endorse or promote products derived from this software
> + *    without specific prior written permission.
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
> + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR
> + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
> + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
> + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> + * SUCH DAMAGE.
> + *
> + * Copyright (C) 2019 OpenSynergy GmbH.
> + */
> +
> +#ifndef _UAPI_LINUX_VIRTIO_VIDEO_H
> +#define _UAPI_LINUX_VIRTIO_VIDEO_H
> +
> +#include <linux/types.h>
> +#include <linux/virtio_config.h>
> +
> +/*
> + * Feature bits
> + */
> +
> +/* Guest pages can be used for video buffers. */
> +#define VIRTIO_VIDEO_F_RESOURCE_GUEST_PAGES 0
> +/*
> + * The host can process buffers even if they are non-contiguous memory such as
> + * scatter-gather lists.
> + */
> +#define VIRTIO_VIDEO_F_RESOURCE_NON_CONTIG 1
> +
> +/*
> + * Image formats
> + */
> +
> +enum virtio_video_format {
> +       /* Raw formats */
> +       VIRTIO_VIDEO_FORMAT_RAW_MIN = 1,
> +       VIRTIO_VIDEO_FORMAT_ARGB8888 = VIRTIO_VIDEO_FORMAT_RAW_MIN,
> +       VIRTIO_VIDEO_FORMAT_BGRA8888,
> +       VIRTIO_VIDEO_FORMAT_NV12, /* 12  Y/CbCr 4:2:0  */
> +       VIRTIO_VIDEO_FORMAT_YUV420, /* 12  YUV 4:2:0     */
> +       VIRTIO_VIDEO_FORMAT_YVU420, /* 12  YVU 4:2:0     */
> +       VIRTIO_VIDEO_FORMAT_RAW_MAX = VIRTIO_VIDEO_FORMAT_YVU420,
> +
> +       /* Coded formats */
> +       VIRTIO_VIDEO_FORMAT_CODED_MIN = 0x1000,
> +       VIRTIO_VIDEO_FORMAT_MPEG2 =
> +               VIRTIO_VIDEO_FORMAT_CODED_MIN, /* MPEG-2 Part 2 */
> +       VIRTIO_VIDEO_FORMAT_MPEG4, /* MPEG-4 Part 2 */
> +       VIRTIO_VIDEO_FORMAT_H264, /* H.264 */
> +       VIRTIO_VIDEO_FORMAT_HEVC, /* HEVC aka H.265*/
> +       VIRTIO_VIDEO_FORMAT_VP8, /* VP8 */
> +       VIRTIO_VIDEO_FORMAT_VP9, /* VP9 */
> +       VIRTIO_VIDEO_FORMAT_CODED_MAX = VIRTIO_VIDEO_FORMAT_VP9,
> +};
> +
> +enum virtio_video_profile {
> +       /* H.264 */
> +       VIRTIO_VIDEO_PROFILE_H264_MIN = 0x100,
> +       VIRTIO_VIDEO_PROFILE_H264_BASELINE = VIRTIO_VIDEO_PROFILE_H264_MIN,
> +       VIRTIO_VIDEO_PROFILE_H264_MAIN,
> +       VIRTIO_VIDEO_PROFILE_H264_EXTENDED,
> +       VIRTIO_VIDEO_PROFILE_H264_HIGH,
> +       VIRTIO_VIDEO_PROFILE_H264_HIGH10PROFILE,
> +       VIRTIO_VIDEO_PROFILE_H264_HIGH422PROFILE,
> +       VIRTIO_VIDEO_PROFILE_H264_HIGH444PREDICTIVEPROFILE,
> +       VIRTIO_VIDEO_PROFILE_H264_SCALABLEBASELINE,
> +       VIRTIO_VIDEO_PROFILE_H264_SCALABLEHIGH,
> +       VIRTIO_VIDEO_PROFILE_H264_STEREOHIGH,
> +       VIRTIO_VIDEO_PROFILE_H264_MULTIVIEWHIGH,
> +       VIRTIO_VIDEO_PROFILE_H264_MAX = VIRTIO_VIDEO_PROFILE_H264_MULTIVIEWHIGH,
> +
> +       /* HEVC */
> +       VIRTIO_VIDEO_PROFILE_HEVC_MIN = 0x200,
> +       VIRTIO_VIDEO_PROFILE_HEVC_MAIN = VIRTIO_VIDEO_PROFILE_HEVC_MIN,
> +       VIRTIO_VIDEO_PROFILE_HEVC_MAIN10,
> +       VIRTIO_VIDEO_PROFILE_HEVC_MAIN_STILL_PICTURE,
> +       VIRTIO_VIDEO_PROFILE_HEVC_MAX =
> +               VIRTIO_VIDEO_PROFILE_HEVC_MAIN_STILL_PICTURE,
> +
> +       /* VP8 */
> +       VIRTIO_VIDEO_PROFILE_VP8_MIN = 0x300,
> +       VIRTIO_VIDEO_PROFILE_VP8_PROFILE0 = VIRTIO_VIDEO_PROFILE_VP8_MIN,
> +       VIRTIO_VIDEO_PROFILE_VP8_PROFILE1,
> +       VIRTIO_VIDEO_PROFILE_VP8_PROFILE2,
> +       VIRTIO_VIDEO_PROFILE_VP8_PROFILE3,
> +       VIRTIO_VIDEO_PROFILE_VP8_MAX = VIRTIO_VIDEO_PROFILE_VP8_PROFILE3,
> +
> +       /* VP9 */
> +       VIRTIO_VIDEO_PROFILE_VP9_MIN = 0x400,
> +       VIRTIO_VIDEO_PROFILE_VP9_PROFILE0 = VIRTIO_VIDEO_PROFILE_VP9_MIN,
> +       VIRTIO_VIDEO_PROFILE_VP9_PROFILE1,
> +       VIRTIO_VIDEO_PROFILE_VP9_PROFILE2,
> +       VIRTIO_VIDEO_PROFILE_VP9_PROFILE3,
> +       VIRTIO_VIDEO_PROFILE_VP9_MAX = VIRTIO_VIDEO_PROFILE_VP9_PROFILE3,
> +};
> +
> +enum virtio_video_level {
> +       /* H.264 */
> +       VIRTIO_VIDEO_LEVEL_H264_MIN = 0x100,
> +       VIRTIO_VIDEO_LEVEL_H264_1_0 = VIRTIO_VIDEO_LEVEL_H264_MIN,
> +       VIRTIO_VIDEO_LEVEL_H264_1_1,
> +       VIRTIO_VIDEO_LEVEL_H264_1_2,
> +       VIRTIO_VIDEO_LEVEL_H264_1_3,
> +       VIRTIO_VIDEO_LEVEL_H264_2_0,
> +       VIRTIO_VIDEO_LEVEL_H264_2_1,
> +       VIRTIO_VIDEO_LEVEL_H264_2_2,
> +       VIRTIO_VIDEO_LEVEL_H264_3_0,
> +       VIRTIO_VIDEO_LEVEL_H264_3_1,
> +       VIRTIO_VIDEO_LEVEL_H264_3_2,
> +       VIRTIO_VIDEO_LEVEL_H264_4_0,
> +       VIRTIO_VIDEO_LEVEL_H264_4_1,
> +       VIRTIO_VIDEO_LEVEL_H264_4_2,
> +       VIRTIO_VIDEO_LEVEL_H264_5_0,
> +       VIRTIO_VIDEO_LEVEL_H264_5_1,
> +       VIRTIO_VIDEO_LEVEL_H264_MAX = VIRTIO_VIDEO_LEVEL_H264_5_1,
> +};
> +
> +/*
> + * Config
> + */
> +
> +struct virtio_video_config {
> +       __le32 version;
> +       __le32 max_caps_length;
> +       __le32 max_resp_length;
> +};
> +
> +/*
> + * Commands
> + */
> +
> +enum virtio_video_cmd_type {
> +       /* Command */
> +       VIRTIO_VIDEO_CMD_QUERY_CAPABILITY = 0x0100,
> +       VIRTIO_VIDEO_CMD_STREAM_CREATE,
> +       VIRTIO_VIDEO_CMD_STREAM_DESTROY,
> +       VIRTIO_VIDEO_CMD_STREAM_DRAIN,
> +       VIRTIO_VIDEO_CMD_RESOURCE_CREATE,
> +       VIRTIO_VIDEO_CMD_RESOURCE_QUEUE,
> +       VIRTIO_VIDEO_CMD_RESOURCE_DESTROY_ALL,
> +       VIRTIO_VIDEO_CMD_QUEUE_CLEAR,
> +       VIRTIO_VIDEO_CMD_GET_PARAMS,
> +       VIRTIO_VIDEO_CMD_SET_PARAMS,
> +       VIRTIO_VIDEO_CMD_QUERY_CONTROL,
> +       VIRTIO_VIDEO_CMD_GET_CONTROL,
> +       VIRTIO_VIDEO_CMD_SET_CONTROL,
> +
> +       /* Response */
> +       VIRTIO_VIDEO_RESP_OK_NODATA = 0x0200,
> +       VIRTIO_VIDEO_RESP_OK_QUERY_CAPABILITY,
> +       VIRTIO_VIDEO_RESP_OK_RESOURCE_QUEUE,
> +       VIRTIO_VIDEO_RESP_OK_GET_PARAMS,
> +       VIRTIO_VIDEO_RESP_OK_QUERY_CONTROL,
> +       VIRTIO_VIDEO_RESP_OK_GET_CONTROL,
> +
> +       VIRTIO_VIDEO_RESP_ERR_INVALID_OPERATION = 0x0300,
> +       VIRTIO_VIDEO_RESP_ERR_OUT_OF_MEMORY,
> +       VIRTIO_VIDEO_RESP_ERR_INVALID_STREAM_ID,
> +       VIRTIO_VIDEO_RESP_ERR_INVALID_RESOURCE_ID,
> +       VIRTIO_VIDEO_RESP_ERR_INVALID_PARAMETER,
> +       VIRTIO_VIDEO_RESP_ERR_UNSUPPORTED_CONTROL,
> +};
> +
> +struct virtio_video_cmd_hdr {
> +       __le32 type; /* One of enum virtio_video_cmd_type */
> +       __le32 stream_id;
> +};
> +
> +/* VIRTIO_VIDEO_CMD_QUERY_CAPABILITY */
> +enum virtio_video_queue_type {
> +       VIRTIO_VIDEO_QUEUE_TYPE_INPUT = 0x100,
> +       VIRTIO_VIDEO_QUEUE_TYPE_OUTPUT,
> +};
> +
> +struct virtio_video_query_capability {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 queue_type; /* One of VIRTIO_VIDEO_QUEUE_TYPE_* types */
> +       __u8 padding[4];
> +};
> +
> +enum virtio_video_planes_layout_flag {
> +       VIRTIO_VIDEO_PLANES_LAYOUT_SINGLE_BUFFER = 1 << 0,
> +       VIRTIO_VIDEO_PLANES_LAYOUT_PER_PLANE = 1 << 1,
> +};
> +
> +struct virtio_video_format_range {
> +       __le32 min;
> +       __le32 max;
> +       __le32 step;
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_format_frame {
> +       struct virtio_video_format_range width;
> +       struct virtio_video_format_range height;
> +       __le32 num_rates;
> +       __u8 padding[4];
> +       /* Followed by struct virtio_video_format_range frame_rates[] */
> +};
> +
> +struct virtio_video_format_desc {
> +       __le64 mask;
> +       __le32 format; /* One of VIRTIO_VIDEO_FORMAT_* types */
> +       __le32 planes_layout; /* Bitmask with VIRTIO_VIDEO_PLANES_LAYOUT_* */
> +       __le32 plane_align;
> +       __le32 num_frames;
> +       /* Followed by struct virtio_video_format_frame frames[] */
> +};
> +
> +struct virtio_video_query_capability_resp {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 num_descs;
> +       __u8 padding[4];
> +       /* Followed by struct virtio_video_format_desc descs[] */
> +};
> +
> +/* VIRTIO_VIDEO_CMD_STREAM_CREATE */
> +enum virtio_video_mem_type {
> +       VIRTIO_VIDEO_MEM_TYPE_GUEST_PAGES,
> +};
> +
> +struct virtio_video_stream_create {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 in_mem_type; /* One of VIRTIO_VIDEO_MEM_TYPE_* types */
> +       __le32 out_mem_type; /* One of VIRTIO_VIDEO_MEM_TYPE_* types */
> +       __le32 coded_format; /* One of VIRTIO_VIDEO_FORMAT_* types */
> +       __u8 padding[4];
> +       __u8 tag[64];
> +};
> +
> +/* VIRTIO_VIDEO_CMD_STREAM_DESTROY */
> +struct virtio_video_stream_destroy {
> +       struct virtio_video_cmd_hdr hdr;
> +};
> +
> +/* VIRTIO_VIDEO_CMD_STREAM_DRAIN */
> +struct virtio_video_stream_drain {
> +       struct virtio_video_cmd_hdr hdr;
> +};
> +
> +/* VIRTIO_VIDEO_CMD_RESOURCE_CREATE */
> +struct virtio_video_mem_entry {
> +       __le64 addr;
> +       __le32 length;
> +       __u8 padding[4];
> +};
> +
> +#define VIRTIO_VIDEO_MAX_PLANES 8
> +
> +struct virtio_video_resource_create {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 queue_type; /* One of VIRTIO_VIDEO_QUEUE_TYPE_* types */
> +       __le32 resource_id;
> +       __le32 planes_layout;
> +       __le32 num_planes;
> +       __le32 plane_offsets[VIRTIO_VIDEO_MAX_PLANES];
> +       __le32 num_entries[VIRTIO_VIDEO_MAX_PLANES];
> +       /* Followed by struct virtio_video_mem_entry entries[] */
> +};
> +
> +/* VIRTIO_VIDEO_CMD_RESOURCE_QUEUE */
> +struct virtio_video_resource_queue {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 queue_type; /* One of VIRTIO_VIDEO_QUEUE_TYPE_* types */
> +       __le32 resource_id;
> +       __le64 timestamp;
> +       __le32 num_data_sizes;
> +       __le32 data_sizes[VIRTIO_VIDEO_MAX_PLANES];
> +       __u8 padding[4];
> +};
> +
> +enum virtio_video_buffer_flag {
> +       VIRTIO_VIDEO_BUFFER_FLAG_ERR = 0x0001,
> +       VIRTIO_VIDEO_BUFFER_FLAG_EOS = 0x0002,
> +
> +       /* Encoder only */
> +       VIRTIO_VIDEO_BUFFER_FLAG_IFRAME = 0x0004,
> +       VIRTIO_VIDEO_BUFFER_FLAG_PFRAME = 0x0008,
> +       VIRTIO_VIDEO_BUFFER_FLAG_BFRAME = 0x0010,
> +};
> +
> +struct virtio_video_resource_queue_resp {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le64 timestamp;
> +       __le32 flags; /* One of VIRTIO_VIDEO_BUFFER_FLAG_* flags */
> +       __le32 size; /* Encoded size */
> +};
> +
> +/* VIRTIO_VIDEO_CMD_RESOURCE_DESTROY_ALL */
> +struct virtio_video_resource_destroy_all {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 queue_type; /* One of VIRTIO_VIDEO_QUEUE_TYPE_* types */
> +       __u8 padding[4];
> +};
> +
> +/* VIRTIO_VIDEO_CMD_QUEUE_CLEAR */
> +struct virtio_video_queue_clear {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 queue_type; /* One of VIRTIO_VIDEO_QUEUE_TYPE_* types */
> +       __u8 padding[4];
> +};
> +
> +/* VIRTIO_VIDEO_CMD_GET_PARAMS */
> +struct virtio_video_plane_format {
> +       __le32 plane_size;
> +       __le32 stride;
> +};
> +
> +struct virtio_video_crop {
> +       __le32 left;
> +       __le32 top;
> +       __le32 width;
> +       __le32 height;
> +};
> +
> +struct virtio_video_params {
> +       __le32 queue_type; /* One of VIRTIO_VIDEO_QUEUE_TYPE_* types */
> +       __le32 format; /* One of VIRTIO_VIDEO_FORMAT_* types */
> +       __le32 frame_width;
> +       __le32 frame_height;
> +       __le32 min_buffers;
> +       __le32 max_buffers;
> +       struct virtio_video_crop crop;
> +       __le32 frame_rate;
> +       __le32 num_planes;
> +       struct virtio_video_plane_format plane_formats[VIRTIO_VIDEO_MAX_PLANES];
> +};
> +
> +struct virtio_video_get_params {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 queue_type; /* One of VIRTIO_VIDEO_QUEUE_TYPE_* types */
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_get_params_resp {
> +       struct virtio_video_cmd_hdr hdr;
> +       struct virtio_video_params params;
> +};
> +
> +/* VIRTIO_VIDEO_CMD_SET_PARAMS */
> +struct virtio_video_set_params {
> +       struct virtio_video_cmd_hdr hdr;
> +       struct virtio_video_params params;
> +};
> +
> +/* VIRTIO_VIDEO_CMD_QUERY_CONTROL */
> +enum virtio_video_control_type {
> +       VIRTIO_VIDEO_CONTROL_BITRATE = 1,
> +       VIRTIO_VIDEO_CONTROL_PROFILE,
> +       VIRTIO_VIDEO_CONTROL_LEVEL,
> +};
> +
> +struct virtio_video_query_control_profile {
> +       __le32 format; /* One of VIRTIO_VIDEO_FORMAT_* */
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_query_control_level {
> +       __le32 format; /* One of VIRTIO_VIDEO_FORMAT_* */
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_query_control {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 control; /* One of VIRTIO_VIDEO_CONTROL_* types */
> +       __u8 padding[4];
> +       /*
> +        * Followed by a value of struct virtio_video_query_control_*
> +        * in accordance with the value of control.
> +        */
> +};
> +
> +struct virtio_video_query_control_resp_profile {
> +       __le32 num;
> +       __u8 padding[4];
> +       /* Followed by an array le32 profiles[] */
> +};
> +
> +struct virtio_video_query_control_resp_level {
> +       __le32 num;
> +       __u8 padding[4];
> +       /* Followed by an array le32 level[] */
> +};
> +
> +struct virtio_video_query_control_resp {
> +       struct virtio_video_cmd_hdr hdr;
> +       /* Followed by one of struct virtio_video_query_control_resp_* */
> +};
> +
> +/* VIRTIO_VIDEO_CMD_GET_CONTROL */
> +struct virtio_video_get_control {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 control; /* One of VIRTIO_VIDEO_CONTROL_* types */
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_control_val_bitrate {
> +       __le32 bitrate;
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_control_val_profile {
> +       __le32 profile;
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_control_val_level {
> +       __le32 level;
> +       __u8 padding[4];
> +};
> +
> +struct virtio_video_get_control_resp {
> +       struct virtio_video_cmd_hdr hdr;
> +       /* Followed by one of struct virtio_video_control_val_* */
> +};
> +
> +/* VIRTIO_VIDEO_CMD_SET_CONTROL */
> +struct virtio_video_set_control {
> +       struct virtio_video_cmd_hdr hdr;
> +       __le32 control; /* One of VIRTIO_VIDEO_CONTROL_* types */
> +       __u8 padding[4];
> +       /* Followed by one of struct virtio_video_control_val_* */
> +};
> +
> +struct virtio_video_set_control_resp {
> +       struct virtio_video_cmd_hdr hdr;
> +};
> +
> +/*
> + * Events
> + */
> +
> +enum virtio_video_event_type {
> +       /* For all devices */
> +       VIRTIO_VIDEO_EVENT_ERROR = 0x0100,
> +
> +       /* For decoder only */
> +       VIRTIO_VIDEO_EVENT_DECODER_RESOLUTION_CHANGED = 0x0200,
> +};
> +
> +struct virtio_video_event {
> +       __le32 event_type; /* One of VIRTIO_VIDEO_EVENT_* types */
> +       __le32 stream_id;
> +};
> +
> +#endif /* _UAPI_LINUX_VIRTIO_VIDEO_H */

> --
> 2.25.0
>
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