DISCOVERY (INT)(9)

🎀 discovery (int) 🎀

okay so bestie, welcome to the Kernel API Manual, section 9, entry discovery (int). buckle up, it's a short one but it's kind of a baddie 💅

🌸 the actual vibe 🌸

so what does it do?? it lets the driver discover hardware IP information from the IP Discovery table that lives right at the top of VRAM. that's it. that's the whole thing. queen behavior honestly 👑

and the values? here's the cheat sheet, no cap:

• -1 — auto (this is the default, she's flexible ✨)
• 0 — disabled (nope, not today 🙈)
• 1 — enabled (yes bestie, go off 🔥)
• 2 — use the ip_discovery table from file (file-based era 📁)

fr fr, those are the only four values. don't get creative.

✨ SEE ALSO ✨

and now the main event 😭 our girl has so many friends. it's giving group chat with 91 members and everyone's typing. here's the full squad, all of them living in section 9:

• vramlimit (int)(9)
• vis_vramlimit (int)(9)
• gartsize (uint)(9)
• gttsize (int)(9)
• moverate (int)(9)
• audio (int)(9)
• disp_priority (int)(9)
• hw_i2c (int)(9)
• pcie_gen2 (int)(9)
• msi (int)(9)
• svm_default_granularity (uint)(9)
• lockup_timeout (string)(9)
• dpm (int)(9)
• fw_load_type (int)(9)
• aspm (int)(9)
• runpm (int)(9)
• ip_block_mask (uint)(9)
• bapm (int)(9)
• deep_color (int)(9)
• vm_size (int)(9)
• vm_fragment_size (int)(9)
• vm_block_size (int)(9)
• vm_fault_stop (int)(9)
• vm_update_mode (int)(9)
• exp_hw_support (int)(9)
• dc (int)(9)
• sched_jobs (int)(9)
• sched_hw_submission (int)(9)
• ppfeaturemask (hexint)(9)
• forcelongtraining (uint)(9)
• pcie_gen_cap (uint)(9)
• pcie_lane_cap (uint)(9)
• cg_mask (ullong)(9)
• pg_mask (uint)(9)
• sdma_phase_quantum (uint)(9)
• disable_cu (charp)(9)
• virtual_display (charp)(9)
• lbpw (int)(9)
• gpu_recovery (int)(9)
• emu_mode (int)(9)
• ras_enable (int)(9)
• ras_mask (uint)(9)
• timeout_fatal_disable (bool)(9)
• timeout_period (uint)(9)
• si_support (int)(9)
• cik_support (int)(9)
• smu_memory_pool_size (uint)(9)
• async_gfx_ring (int)(9)
• mcbp (int)(9)
• mes_log_enable (int)(9)
• uni_mes (int)(9)
• noretry (int)(9)
• force_asic_type (int)(9)
• use_xgmi_p2p (int)(9)
• sched_policy (int)(9)
• hws_max_conc_proc (int)(9)
• cwsr_enable (int)(9)
• max_num_of_queues_per_device (int)(9)
• send_sigterm (int)(9)
• halt_if_hws_hang (int)(9)
• hws_gws_support(bool)(9)
• queue_preemption_timeout_ms (int)(9)
• debug_evictions(bool)(9)
• no_system_mem_limit(bool)(9)
• no_queue_eviction_on_vm_fault (int)(9)
• mtype_local (int)(9)
• pcie_p2p (bool)(9)
• dcfeaturemask (uint)(9)
• dcdebugmask (uint)(9)
• abmlevel (uint)(9)
• damageclips (int)(9)
• tmz (int)(9)
• freesync_video (uint)(9)
• reset_method (int)(9)
• bad_page_threshold (int) Bad page threshold is specifies the(9)
• vcnfw_log (int)(9)
• sg_display (int)(9)
• umsch_mm (int)(9)
• umsch_mm_fwlog (int)(9)
• smu_pptable_id (int)(9)
• partition_mode (int)(9)
• enforce_isolation (int)(9)
• modeset (int)(9)
• seamless (int)(9)
• debug_mask (uint)(9)
• agp (int)(9)
• wbrf (int)(9)
• rebar (int)(9)
• user_queue (int)(9)
• ptl (int)(9)

🫶 also the kernel file that birthed her: ./drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c — go say hi, she's the source of truth 💖

and that's the whole page!! slay. this absolute icon lives over in ./drivers/gpu/drm/amd/amdgpu, version October 2026, page name discovery (int)(9) — mwah, go read the other 90 of them, ily, bye 🦋💜🌸