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authorEzequiel Garcia <ezequiel@collabora.com>2018-07-02 17:36:05 +0200
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2018-07-04 14:43:47 +0200
commitbe2fff656322e82f215730839063c2c2ca73d14b (patch)
treed2611d3d65223d07e2839d7d1f308365819085c9 /drivers/media/v4l2-core/v4l2-mem2mem.c
parentmedia: mark entity-intf links as IMMUTABLE (diff)
downloadlinux-be2fff656322e82f215730839063c2c2ca73d14b.tar.xz
linux-be2fff656322e82f215730839063c2c2ca73d14b.zip
media: add helpers for memory-to-memory media controller
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] [hans.verkuil@cisco.com: mark interface links as IMMUTABLE] Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-mem2mem.c')
-rw-r--r--drivers/media/v4l2-core/v4l2-mem2mem.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 5f9cd5b74cda..725da74d15d8 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 +52,17 @@ 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
+};
+
+static const char * const m2m_entity_name[] = {
+ "source",
+ "sink",
+ "proc"
+};
/**
* struct v4l2_m2m_dev - per-device context
@@ -60,6 +73,15 @@ 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;
@@ -594,6 +616,174 @@ 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);
+ kfree(m2m_dev->source->name);
+ kfree(m2m_dev->sink.name);
+ kfree(m2m_dev->proc.name);
+}
+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,
+ struct video_device *vdev, int function)
+{
+ struct media_entity *entity;
+ struct media_pad *pads;
+ char *name;
+ unsigned int len;
+ int num_pads;
+ int ret;
+
+ switch (type) {
+ case MEM2MEM_ENT_TYPE_SOURCE:
+ entity = m2m_dev->source;
+ pads = &m2m_dev->source_pad;
+ 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_SINK;
+ pads[1].flags = MEDIA_PAD_FL_SOURCE;
+ num_pads = 2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
+ if (type != MEM2MEM_ENT_TYPE_PROC) {
+ entity->info.dev.major = VIDEO_MAJOR;
+ entity->info.dev.minor = vdev->minor;
+ }
+ len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
+ name = kmalloc(len, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+ snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
+ entity->name = name;
+ entity->function = function;
+
+ ret = media_entity_pads_init(entity, num_pads, pads);
+ if (ret)
+ return ret;
+ ret = media_device_register_entity(mdev, entity);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
+ struct video_device *vdev, int function)
+{
+ struct media_device *mdev = vdev->v4l2_dev->mdev;
+ struct media_link *link;
+ int ret;
+
+ if (!mdev)
+ return 0;
+
+ /* A memory-to-memory device consists in two
+ * DMA engine and one video processing entities.
+ * The DMA engine entities are linked to a V4L interface
+ */
+
+ /* Create the three entities with their pads */
+ m2m_dev->source = &vdev->entity;
+ ret = v4l2_m2m_register_entity(mdev, m2m_dev,
+ MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
+ if (ret)
+ return ret;
+ ret = v4l2_m2m_register_entity(mdev, m2m_dev,
+ MEM2MEM_ENT_TYPE_PROC, vdev, function);
+ if (ret)
+ goto err_rel_entity0;
+ ret = v4l2_m2m_register_entity(mdev, m2m_dev,
+ MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
+ if (ret)
+ goto err_rel_entity1;
+
+ /* Connect the three entities */
+ ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 1,
+ MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
+ if (ret)
+ goto err_rel_entity2;
+
+ ret = media_create_pad_link(&m2m_dev->proc, 0, &m2m_dev->sink, 0,
+ MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
+ if (ret)
+ goto err_rm_links0;
+
+ /* Create video interface */
+ m2m_dev->intf_devnode = media_devnode_create(mdev,
+ MEDIA_INTF_T_V4L_VIDEO, 0,
+ VIDEO_MAJOR, vdev->minor);
+ if (!m2m_dev->intf_devnode) {
+ ret = -ENOMEM;
+ goto err_rm_links1;
+ }
+
+ /* Connect the two DMA engines to the interface */
+ link = media_create_intf_link(m2m_dev->source,
+ &m2m_dev->intf_devnode->intf,
+ MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
+ if (!link) {
+ ret = -ENOMEM;
+ goto err_rm_devnode;
+ }
+
+ link = media_create_intf_link(&m2m_dev->sink,
+ &m2m_dev->intf_devnode->intf,
+ MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
+ if (!link) {
+ ret = -ENOMEM;
+ goto err_rm_intf_link;
+ }
+ return 0;
+
+err_rm_intf_link:
+ media_remove_intf_links(&m2m_dev->intf_devnode->intf);
+err_rm_devnode:
+ media_devnode_remove(m2m_dev->intf_devnode);
+err_rm_links1:
+ media_entity_remove_links(&m2m_dev->sink);
+err_rm_links0:
+ media_entity_remove_links(&m2m_dev->proc);
+ media_entity_remove_links(m2m_dev->source);
+err_rel_entity2:
+ media_device_unregister_entity(&m2m_dev->proc);
+ kfree(m2m_dev->proc.name);
+err_rel_entity1:
+ media_device_unregister_entity(&m2m_dev->sink);
+ kfree(m2m_dev->sink.name);
+err_rel_entity0:
+ media_device_unregister_entity(m2m_dev->source);
+ kfree(m2m_dev->source->name);
+ return ret;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
+#endif
+
struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
{
struct v4l2_m2m_dev *m2m_dev;