STRUCT PANTHOR_FW_CSG_IFACE(9)

💖 struct panthor_fw_csg_iface(9) 💖

okay bestie, welcome to the Kernel API Manual glow-up for struct panthor_fw_csg_iface — literally the firmware command stream group slot interface. no cap, every field is here, so let’s get into it 🫶

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✨ NAME ✨

struct panthor_fw_csg_iface — Firmware command stream group slot interface

🌸 SYNOPSIS 🌸

       struct panthor_fw_csg_iface {
           spinlock_t lock;
           const struct panthor_fw_csg_control_iface *control;
           struct panthor_fw_csg_input_iface *input;
           const struct panthor_fw_csg_output_iface *output;
        };

🎀 Members 🎀

• lock — Lock protecting access to the panthor_fw_csg_input_iface::req field.

Needed so we can update the req field concurrently from the interrupt handler and the scheduler logic.

TODO: Ideally we'd want to use a cmpxchg to update the req, but FW interface sections are mapped uncached/write-combined right now, and using cmpxchg on such mappings leads to SError faults. Revisit when we have 'SHARED' GPU mappings hooked up.

• control — Command stream group slot control interface.

Used to expose command stream group slot properties.

This interface is read-only. 🔒

• input — Command stream slot input interface.

Used for host updates/events. 💌

• output — Command stream group slot output interface.

Used for FW updates/events.

This interface is read-only. 🔒

👀 SEE ALSO 👀

Kernel file ./drivers/gpu/drm/panthor/panthor_fw.h struct panthor_fw_cs_iface(9), struct panthor_fw_global_iface(9), panthor_fw_toggle_reqs(9), panthor_fw_update_reqs(9)

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okay that’s the whole vibe check, bestie. huge shoutout to source/version ./drivers/gpu/drm/panthor, dated October 2026 — mwah, slay, periodt 💅✨