STRUCT DRM_PANTHOR_CSIF_INFO(9)

💅 struct drm_panthor_csif_info(9) — like, the Kernel API Manual, but make it make sense 🎀

okay bestie, welcome to the Kernel API Manual ✨ — yes that's the manual name, it's fancy, we love her. today's main character is struct drm_panthor_csif_info, and she's literally just a little info-dump about the command stream interface. no cap. 🦋

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✨ NAME ✨

struct drm_panthor_csif_info — Command stream interface information 🎀

Like, the whole vibe of this struct is "tell me about the CSIF, but make it queryable."

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🌸 SYNOPSIS 🌸

struct drm_panthor_csif_info {
    __u32 csg_slot_count;
    __u32 cs_slot_count;
    __u32 cs_reg_count;
    __u32 scoreboard_slot_count;
    __u32 unpreserved_cs_reg_count;
    __u32 pad;
 };

it's giving "small struct, important job" 💅 (and yes, keep it exactly like that, don't go editing the field names, iykyk).

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👑 Members 👑

okay so bestie, here's the cast of characters, one by one 🫶

• csg_slot_count — how many command stream group slots the firmware exposes. that's the group-slot headcount, fr fr. 👑
• cs_slot_count — how many command stream slots you get per group. per group, bestie. 🎀
• cs_reg_count — the number of command stream registers. 👀
• scoreboard_slot_count — the number of scoreboard slots. 🏆
• unpreserved_cs_reg_count — the number of command stream registers that the kernel driver reserves for itself, specifically so it can call a userspace command stream. 🔥
• pad — the padding field. set it to zero. that's it, that's the whole job. ⭐

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🧚 the little caveat you should NOT skip 🧚

so here's the tea: all registers can be used by a userspace command stream, but the [cs_slot_count - unpreserved_cs_reg_count .. cs_slot_count] registers are the ones the kernel uses when DRM_PANTHOR_IOCTL_GROUP_SUBMIT is called. 💀

copy that range exactly, don't let anyone tell you it's a different range. the kernel has dibs on those, periodt. 🫶

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🌈 Description 🌈

struct drm_panthor_csif_info is, like, the structure that groups together all the queryable information relating to the command stream interface. one struct, all the info, main character energy honestly. ✨

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🦋 SEE ALSO 🦋

okay this is the long part but we do NOT skip it, bestie, every single one is here 😭💖

• Kernel file ./include/uapi/drm/panthor_drm.h
• Introduction(9)
• MMIO regions exposed to userspace.(9)
• IOCTL IDs(9)
• IOCTL arguments(9)
• struct drm_panthor_obj_array(9)
• DRM_PANTHOR_OBJ_ARRAY(9)
• enum drm_panthor_sync_op_flags(9)
• struct drm_panthor_sync_op(9)
• enum drm_panthor_dev_query_type(9)
• enum drm_panthor_gpu_coherency(9)
• struct drm_panthor_gpu_info(9)
• enum drm_panthor_timestamp_info_flags(9)
• struct drm_panthor_timestamp_info(9)
• struct drm_panthor_mmu_info(9)
• struct drm_panthor_group_priorities_info(9)
• struct drm_panthor_dev_query(9)
• struct drm_panthor_vm_create(9)
• struct drm_panthor_vm_destroy(9)
• enum drm_panthor_vm_bind_op_flags(9)
• struct drm_panthor_vm_bind_op(9)
• enum drm_panthor_vm_bind_flags(9)
• struct drm_panthor_vm_bind(9)
• enum drm_panthor_vm_state(9)
• struct drm_panthor_vm_get_state(9)
• enum drm_panthor_bo_flags(9)
• struct drm_panthor_bo_create(9)
• struct drm_panthor_bo_mmap_offset(9)
• struct drm_panthor_queue_create(9)
• enum drm_panthor_group_priority(9)
• struct drm_panthor_group_create(9)
• struct drm_panthor_group_destroy(9)
• struct drm_panthor_queue_submit(9)
• struct drm_panthor_group_submit(9)
• enum drm_panthor_group_state_flags(9)
• struct drm_panthor_group_get_state(9)
• struct drm_panthor_tiler_heap_create(9)
• struct drm_panthor_tiler_heap_destroy(9)
• struct drm_panthor_bo_set_label(9)
• struct drm_panthor_set_user_mmio_offset(9)
• enum drm_panthor_bo_sync_op_type(9)
• struct drm_panthor_bo_sync_op(9)
• struct drm_panthor_bo_sync(9)
• enum drm_panthor_bo_extra_flags(9)
• struct drm_panthor_bo_query_info(9)
• DRM_IOCTL_PANTHOR(9)

like, go read them, they're all slay in their own way 💜

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and that's a wrap, bestie! 🌸 this page lives in ./include/uapi/drm and it's dated October 2026 — so yeah, bookmark it, screenshot it, put it on your fridge, whatever 🎀💖 mwah! 🫶✨