amdgpu_gfx_...eamble_start(9)

💖 amdgpu_gfx_csb_preamble_start — a Kernel API Manual moment 💖

okay so bestie, welcome to the Kernel API Manual 🎀 — yes this page is literally titled amdgpu_gfx_...eamble_start(9) in the header because apparently we're too iconic for our full name up there, but the real one, the one we go by, is amdgpu_gfx_csb_preamble_start. slay.

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✨ NAME ✨

amdgpu_gfx_csb_preamble_start — sets up the CSB preamble. that's it, that's the whole vibe 🦋

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🌸 SYNOPSIS 🌸

u32 amdgpu_gfx_csb_preamble_start (u32 *buffer );

like... look at her. one pointer, one return value, main character energy 👑

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💅 ARGUMENTS 💅

• buffer — okay so this one is an output variable, meaning you hand it over and it gets stuffed with the PACKET3 preamble setup. it's giving "you'll get it back filled in" 🫶 it's an out-param, not an in-param, no cap.

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⭐ RETURN ⭐

it returns the latest index. literally that's what it does 💫

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🦋 SEE ALSO 🦋

• kernel file: ./drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
• amdgpu_gfx_parse_disable_cu(9)
• amdgpu_gfx_handle_priv_fault(9)
• amdgpu_gfx_set_run_cleaner_shader(9)
• amdgpu_gfx_get_enforce_isolation(9)
• amdgpu_gfx_set_enforce_isolation(9)
• amdgpu_gfx_kfd_sch_ctrl(9)
• amdgpu_gfx_enforce_isolation_handler(9)
• amdgpu_gfx_enforce_isolation_wait_for_kfd(9)
• amdgpu_gfx_enforce_isolation_ring_begin_use(9)
• amdgpu_gfx_enforce_isolation_ring_end_use(9)
• amdgpu_gfx_csb_data_parser(9)
• amdgpu_gfx_csb_preamble_end(9)

the whole amdgpu_gfx friend group fr fr, go read them too 🧚‍♀️

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bestie reminder: everything on this page lives in ./drivers/gpu/drm/amd/amdgpu and this page is stamped October 2026 💜

and that's the page!! Kernel API Manual, ./drivers/gpu/drm/amd/amdgpu, October 2026 — mwah, bye, ily, go set some preambles 😭💖🌈