amdgpu_ttm_tt_set_userptr(9)

✨ amdgpu_ttm_tt_set_userptr(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this little cutie lives in the kernel and it's giving "let me set up your userptr GTT ttm_tt real quick" energy. buckle up 🎀

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💖 NAME 💖

amdgpu_ttm_tt_set_userptr — initializes a userptr GTT ttm_tt, but specifically for the current task. like, whoever's running right now? that's the one. no cap 🫶

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🌸 SYNOPSIS 🌸

int amdgpu_ttm_tt_set_userptr (struct ttm_buffer_object *bo , uint64_t
addr , uint32_t flags );

she takes three things and she returns an int, periodt ✨

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🦋 ARGUMENTS 🦋

• bo — the ttm_buffer_object we're binding this userptr to. this is the main character of the whole operation 👑
• addr — the address, in the current task's VM space, that we're gonna use. in her address space specifically, iykyk 🔥
• flags — the requirements of the userptr object. the vibes/constraints, basically 🍓

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🌈 DESCRIPTION 🌈

so here's the tea ☕ this function gets called by amdgpu_gem_userptr_ioctl and kfd_ioctl_alloc_memory_of_gpu to bind userptr pages to the current task, and also by kfd_ioctl_acquire_vm to initialize the GPU VM for a KFD process. that's the whole job description bestie, she does exactly that 💜

lowkey iconic that one function is out here serving three different callers. multitasking queen 💅

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👑 SEE ALSO 👑

the kernel file in question lives right here, go look at her:

./drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

and the whole friend group 💖:

• amdgpu_evict_flags(9)
• amdgpu_ttm_map_buffer(9)
• amdgpu_ttm_copy_mem_to_mem(9)
• amdgpu_res_cpu_visible(9)
• amdgpu_ttm_domain_start(9)
• amdgpu_ttm_mmio_remap_alloc_sgt(9)
• amdgpu_ttm_tt_create(9)
• amdgpu_ttm_tt_get_userptr(9)
• amdgpu_ttm_tt_pde_flags(9)
• amdgpu_ttm_tt_pte_flags(9)
• amdgpu_ttm_access_memory(9)
• amdgpu_ttm_training_reserve_vram_fini(9)
• amdgpu_ttm_alloc_mmio_remap_bo(9)
• amdgpu_ttm_free_mmio_remap_bo(9)
• amdgpu_ttm_enable_buffer_funcs(9)
• amdgpu_ttm_disable_buffer_funcs(9)
• amdgpu_ttm_clear_buffer(9)
• amdgpu_ttm_evict_resources(9)

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<div align="center">🌸 that's the whole page bestie, go read the source and slay 🌸</div>

and yeah — this one comes from ./drivers/gpu/drm/amd/amdgpu, dated October 2026. mwah, xoxo 💋🧚‍♀️