vc4_set_tiling_ioctl(9)

💅 vc4_set_tiling_ioctl(9) — a Kernel API Manual moment

okay so bestie, welcome to vc4_set_tiling_ioctl(9) from the Kernel API Manual. this is the little ioctl that tells a BO what its tiling vibe is. short page, but she's important, fr fr 🎀

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✨ NAME ✨

vc4_set_tiling_ioctl — sets the tiling modifier for a BO. that's it, that's the whole job, and she does it flawlessly 💅

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🌸 SYNOPSIS 🌸

int vc4_set_tiling_ioctl (struct drm_device *dev , void *data , struct
drm_file *file_priv );

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🦋 ARGUMENTS 🦋

• dev — the DRM device. the main character of the hardware world 👑
• data — the ioctl argument. yes it's a void *, no we don't talk about it 🙈
• file_priv — the DRM file for this fd. your personal little backstage pass 🎟️

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💖 DESCRIPTION 💖

so here's the tea ☕ the tiling state of the BO decides the default modifier of an fb — but ONLY if no specific modifier was set by userspace. like, she's the fallback queen, the understudy who's actually iconic.

she also decides the return value of vc4_get_tiling_ioctl — which is the whole point, honestly. it means userspace can look at a BO it received from dmabuf and treat it as the exact same tiling format the producer used 🫶 no cap, that's the entire reason this exists. symmetry! consistency! we love to see it ✨

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/vc4/vc4_bo.c
• VC4 GEM BO management support(9)
• vc4_create_object(9)
• vc4_get_tiling_ioctl(9) — her sister ioctl, go say hi 💜

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aaaand that's the page 🎀 written under ./drivers/gpu/drm/vc4, stamped October 2026, version vibes of vc4_set_tiling_ioctl(9). mwah, stan her, she's doing her best and her best is literally perfect 💖✨