On 06/21/2018 10:38 PM, Ezequiel Garcia wrote:
> A memory-to-memory pipeline device consists in three
> entities: two DMA engine and one video processing entities.
> The DMA engine entities are linked to a V4L interface.
>
> This commit add a new v4l2_m2m_{un}register_media_controller
> API to register this topology.
>
> For instance, a typical mem2mem device topology would
> look like this:
>
> Device topology
> - entity 1: source (1 pad, 1 link)
> type Node subtype V4L flags 0
> pad0: Source
> -> "proc":1 [ENABLED,IMMUTABLE]
>
> - entity 3: proc (2 pads, 2 links)
> type Node subtype Unknown flags 0
> pad0: Source
> -> "sink":0 [ENABLED,IMMUTABLE]
> pad1: Sink
> <- "source":0 [ENABLED,IMMUTABLE]
>
> - entity 6: sink (1 pad, 1 link)
> type Node subtype V4L flags 0
> pad0: Sink
> <- "proc":0 [ENABLED,IMMUTABLE]
>
> Suggested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Suggested-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-dev.c | 13 +-
> drivers/media/v4l2-core/v4l2-mem2mem.c | 174 +++++++++++++++++++++++++
> include/media/v4l2-mem2mem.h | 19 +++
> include/uapi/linux/media.h | 3 +
> 4 files changed, 204 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
> index 4ffd7d60a901..c1996d73ca74 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -202,7 +202,7 @@ static void v4l2_device_release(struct device *cd)
> mutex_unlock(&videodev_lock);
>
> #if defined(CONFIG_MEDIA_CONTROLLER)
> - if (v4l2_dev->mdev) {
> + if (v4l2_dev->mdev && vdev->vfl_dir != VFL_DIR_M2M) {
> /* Remove interfaces and interface links */
> media_devnode_remove(vdev->intf_devnode);
> if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN)
> @@ -733,19 +733,22 @@ static void determine_valid_ioctls(struct video_device *vdev)
> BASE_VIDIOC_PRIVATE);
> }
>
> -static int video_register_media_controller(struct video_device *vdev, int type)
> +static int video_register_media_controller(struct video_device *vdev)
> {
> #if defined(CONFIG_MEDIA_CONTROLLER)
> u32 intf_type;
> int ret;
>
> - if (!vdev->v4l2_dev->mdev)
> + /* Memory-to-memory devices are more complex and use
> + * their own function to register its mc entities.
> + */
> + if (!vdev->v4l2_dev->mdev || vdev->vfl_dir == VFL_DIR_M2M)
> return 0;
>
> vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE;
> vdev->entity.function = MEDIA_ENT_F_UNKNOWN;
>
> - switch (type) {
> + switch (vdev->vfl_type) {
> case VFL_TYPE_GRABBER:
> intf_type = MEDIA_INTF_T_V4L_VIDEO;
> vdev->entity.function = MEDIA_ENT_F_IO_V4L;
> @@ -993,7 +996,7 @@ int __video_register_device(struct video_device *vdev,
> v4l2_device_get(vdev->v4l2_dev);
>
> /* Part 5: Register the entity. */
> - ret = video_register_media_controller(vdev, type);
> + ret = video_register_media_controller(vdev);
>
> /* Part 6: Activate this minor. The char device can now be used. */
> set_bit(V4L2_FL_REGISTERED, &vdev->flags);
> diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
> index c4f963d96a79..e0e7262b7e75 100644
> --- a/drivers/media/v4l2-core/v4l2-mem2mem.c
> +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
> @@ -17,9 +17,11 @@
> #include <linux/sched.h>
> #include <linux/slab.h>
>
> +#include <media/media-device.h>
> #include <media/videobuf2-v4l2.h>
> #include <media/v4l2-mem2mem.h>
> #include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> #include <media/v4l2-fh.h>
> #include <media/v4l2-event.h>
>
> @@ -50,6 +52,19 @@ module_param(debug, bool, 0644);
> * offsets but for different queues */
> #define DST_QUEUE_OFF_BASE (1 << 30)
>
> +enum v4l2_m2m_entity_type {
> + MEM2MEM_ENT_TYPE_SOURCE,
> + MEM2MEM_ENT_TYPE_SINK,
> + MEM2MEM_ENT_TYPE_PROC,
> + MEM2MEM_ENT_TYPE_MAX
> +};
> +
> +static const char * const m2m_entity_name[] = {
> + "source",
> + "sink",
> + "proc"
> +};
> +
>
> /**
> * struct v4l2_m2m_dev - per-device context
> @@ -60,6 +75,15 @@ module_param(debug, bool, 0644);
> */
> struct v4l2_m2m_dev {
> struct v4l2_m2m_ctx *curr_ctx;
> +#ifdef CONFIG_MEDIA_CONTROLLER
> + struct media_entity *source;
> + struct media_pad source_pad;
> + struct media_entity sink;
> + struct media_pad sink_pad;
> + struct media_entity proc;
> + struct media_pad proc_pads[2];
> + struct media_intf_devnode *intf_devnode;
> +#endif
>
> struct list_head job_queue;
> spinlock_t job_spinlock;
> @@ -595,6 +619,156 @@ int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> }
> EXPORT_SYMBOL(v4l2_m2m_mmap);
>
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
> +{
> + media_remove_intf_links(&m2m_dev->intf_devnode->intf);
> + media_devnode_remove(m2m_dev->intf_devnode);
> +
> + media_entity_remove_links(m2m_dev->source);
> + media_entity_remove_links(&m2m_dev->sink);
> + media_entity_remove_links(&m2m_dev->proc);
> + media_device_unregister_entity(m2m_dev->source);
> + media_device_unregister_entity(&m2m_dev->sink);
> + media_device_unregister_entity(&m2m_dev->proc);
> +}
> +EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);
> +
> +static int v4l2_m2m_register_entity(struct media_device *mdev,
> + struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
> + int function)
> +{
> + struct media_entity *entity;
> + struct media_pad *pads;
> + int num_pads;
> + int ret;
> +
> + switch (type) {
> + case MEM2MEM_ENT_TYPE_SOURCE:
> + entity = m2m_dev->source;
> + pads = &m2m_dev->source_pad;
> + entity->name = m2m_entity_name[type];
> + pads[0].flags = MEDIA_PAD_FL_SOURCE;
> + num_pads = 1;
> + break;
> + case MEM2MEM_ENT_TYPE_SINK:
> + entity = &m2m_dev->sink;
> + pads = &m2m_dev->sink_pad;
> + pads[0].flags = MEDIA_PAD_FL_SINK;
> + num_pads = 1;
> + break;
> + case MEM2MEM_ENT_TYPE_PROC:
> + entity = &m2m_dev->proc;
> + pads = m2m_dev->proc_pads;
> + pads[0].flags = MEDIA_PAD_FL_SOURCE;
> + pads[1].flags = MEDIA_PAD_FL_SINK;
Can you swap this? The v4l2-compliance test gave a "fail: v4l2-test-media.cpp(333): found_source"
message which is because (I think) it expects sink pads before source pads.
I'm not actually sure that this is a requirement, at least I can't find this in the spec,
but for some reason I have this memory that this actually is the right order. It might just
be a custom rather than a requirement.
Anyway, it doesn't matter for this code, so it is easiest to swap it and run v4l2-compliance -m
again.
I am interested in the v4l2-compliance output of the topology.
Regards,
Hans
