drm_client_buffer_vmap(9)

💅 drm_client_buffer_vmap — like, the DRM client buffer mapping manual?? (Kernel API Manual core ✨)

okay bestie, gather round, because this one is genuinely iconic — it's the drm_client_buffer_vmap(9) page from the Kernel API Manual and it's all about getting your DRM client buffer mapped into address space 🎀

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✨ NAME ✨

drm_client_buffer_vmap — Map DRM client buffer into address space 🗺️💖

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🦋 SYNOPSIS 🦋

int drm_client_buffer_vmap (struct drm_client_buffer *buffer , struct
       iosys_map *map_copy );

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🌸 ARGUMENTS 🌸

• buffer — the DRM client buffer, the main character of this whole situation 👑
• map_copy — returns the mapped memory's address, like a little receipt for where your memory ended up 🧾✨

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💜 DESCRIPTION 💜

so, the way this works: this function maps a client buffer into kernel address space. and if the buffer is already mapped?? no worries, it just returns the existing mapping's address. lowkey convenient fr fr 🫶

okay but here's the part where you gotta pay attention 👀 — client buffer mappings are not ref'counted. so every single call to drm_client_buffer_vmap should be followed by a call to drm_client_buffer_vunmap; or the client buffer should just be mapped throughout its lifetime. like, pick one, bestie, don't leave it hanging 😭

and the returned address? it's a copy of the internal value. in contrast to other vmap interfaces, you don't need it for the client's vunmap function. which means — slay — you can modify it at will during blit and draw operations 💅🔥

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⭐ RETURN ⭐

0 on success, or a negative errno code otherwise 🍓

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/drm_client.c overview(9)
• drm_client_init(9)
• drm_client_register(9)
• drm_client_release(9)
• drm_client_buffer_delete(9)
• drm_client_buffer_vmap_local(9)
• drm_client_buffer_vunmap_local(9)
• drm_client_buffer_vunmap(9)
• drm_client_buffer_create_dumb(9)
• drm_client_buffer_flush(9)

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k that's the whole page bestie, ily, go map those buffers responsibly 🧚💖

sign-off era: this lil gem lives in ./drivers/gpu/drm, dated October 2026, and it's the drm_client_buffer_vmap(9) page — periodt 👑💫