MCBP (INT)(9)

🎀 mcbp (int) 🎀

okay so we're in the Kernel API Manual bestie, and this little cutie is called mcbp (int) 💅 it's a kernel parameter and honestly it's giving "small but powerful main character energy" ✨

🌸 what it does 🌸

It is used to enable mid command buffer preemption. 🫶

The values are literally:

• 0 = disabled 💀
• 1 = enabled 🔥
• -1 auto (default) 👑

so yes, default is -1, and yes, it's auto, she's mysterious like that 🧚 no cap.

it lives in the kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c — that's the address, bestie, don't lose it 🎀

👀 SEE ALSO 👀

okay the SEE ALSO list is long, like long long, but every single one of these is iconic in her own way, so we're listing them all, periodt 💖

• 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) 🦋
• discovery (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) 🦋

and that's the whole vibe, bestie 💜 this page is from the ./drivers/gpu/drm/amd/amdgpu source and it's dated October 2026 🌈 mwah, slay, go read your kernel params 🎀✨