ttm_bo_access(9)

💅 ttm_bo_access(9) — Kernel API Manual ✨

okay so this is a page from the Kernel API Manual, bestie, and it's about ttm_bo_access — the little helper that lets you reach into a buffer object. no cap, it's giving "middle-man energy" and honestly? we stan a reliable middle man. 🫶

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🌸 NAME 🌸

ttm_bo_access — helper to access a buffer object. that's it. that's the job. she accesses. 💅

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✨ SYNOPSIS ✨

int ttm_bo_access (struct ttm_buffer_object *bo , unsigned long offset ,
void *buf , int len , int write );

literally just look at her. five arguments, one int coming back. iconic behavior. 🎀

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🦋 ARGUMENTS 🦋

• bo — the ttm buffer object. the main character of this whole operation, fr fr. 👑
• offset — the access offset into the buffer object. like, where in the buffer we're poking around. 📍
• buf — pointer to caller memory to read into or write from. this is your memory, bestie, she's just visiting. 💖
• len — length of access. how many bytes we're doing here. 📏
• write — write access. yes it's just a flag, no it's not subtle, and yes it matters. ✍️

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🧚 DESCRIPTION 🧚

so this is a utility function to access a buffer object. super useful when the buffer object cannot be easily mapped — think non-contiguous, non-visible, etc... you know the vibe. 😭

⚠️ real talk though: it should not directly be exported to user space via a peak / poke interface. like, do not do that. that's not the move. 💀

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🔥 RETURN 🔥

• len if successful 🎉
• a negative error code on failure 😔

that's the whole deal. no in-between, no "it depends", just vibes and integers. 🌈

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/gpu/drm/ttm/ttm_bo_vm.c
• ttm_bo_vm_reserve(9)
• ttm_bo_vm_fault_reserved(9)
• ttm_bo_mmap_obj(9)

go read those too, bestie, they're all in the same friend group. 🫶

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and that's the page!! 🎀 this masterpiece lives in ./drivers/gpu/drm/ttm and it's dated October 2026 — so yeah, mark your calendars, the ttm girlies are thriving. slay, periodt, bye bestie 💜✨