STRUCT CORESIGHT_CONNECTION(9)

💖 NAME 💖

okay so welcome to the Kernel API Manual, bestie — this is the page for struct coresight_connection(9). The name is literally struct coresight_connection — representation of a single connection. That's the whole vibe: one connection, fully represented. no cap. 🫶

✨ SYNOPSIS ✨

Here's the struct in all its glory — fields exactly as they are, no editorial remix:

struct coresight_connection {
    int src_port;
    int dest_port;
    struct fwnode_handle *dest_fwnode;
    struct coresight_device *dest_dev;
    struct coresight_sysfs_link *link;
    struct coresight_device *src_dev;
    struct fwnode_handle *filter_src_fwnode;
    struct coresight_device *filter_src_dev;
    int src_refcnt;
    int dest_refcnt;
};

💅 Members 💅

• src_port — a connection's output port number. iconic little number. ✨
• dest_port — the destination's input port number that src_port is connected to. iykyk. 🔥
• dest_fwnode — the destination component's fwnode handle. 🎀
• dest_dev — a coresight_device representation of the component. slay. 👑
• link — representation of the connection as a sysfs link. cute. 🦋
• filter_src_fwnode — the filter source component's fwnode handle. 💜
• filter_src_dev — a coresight_device representation of the component that — and that's where the original line ends, bestie. No cap, it just stops. 😭

src_dev, src_refcnt, and dest_refcnt are in the struct up top, but this Members section doesn't give them their own one-liners — and I'm not inventing lore. 💀

🌸 Description 🌸

okay so the full connection structure looks like this, where in_conns store references to same connection as the source device's out_conns. Here's the exact diagram, untouched:

       ┌───────────────────────────────────────────────────────────────────┐
       │ coresight_device                    coresight_connection          │
       │ -----------------------------       ----------------------------- │
       │                                                                   │
       └───────────────────────────────────────────────────────────────────┘
       |                             |   |                    dest_dev*|<--
       |pdata->out_conns[nr_outconns]|<->|src_dev*                     |   | |
       |   |                             |   | |

       ┌────────────────────────────────────────┐
       │     coresight_device                   │
       │     ------------------------------     │
       │                                        │
       └────────────────────────────────────────┘
       |  pdata->in_conns[nr_in_conns]|<-- |                             |

🦋 SEE ALSO 🦋

Kernel file: ./include/linux/coresight.h. The whole friend group is:

• union coresight_dev_subtype(9)
• struct coresight_platform_data(9)
• struct csdev_access(9)
• struct coresight_desc(9)
• struct coresight_sysfs_link(9)
• struct coresight_device(9)
• struct coresight_path(9)
• struct coresight_ops_sink(9)
• struct coresight_ops_link(9)
• struct coresight_ops_source(9)
• struct coresight_ops_helper(9)
• struct coresight_ops_panic(9)

source/version: ./include/linux · date: October 2026 — mwah, that's the whole page, bestie. 💋💖