i915_rsgt_from_mm_node(9)

💅 i915_rsgt_from_mm_node(9) — like, the kernel API manual bestie 🎀

okay so welcome to the i915_rsgt_from_mm_node page, part of the Kernel API Manual, and honestly? this one's a little baddie. it takes a struct drm_mm_node and gives you back a refcounted sg_table, which is giving "glow-up machine" energy ✨

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🌸 NAME 🌸

i915_rsgt_from_mm_node — create a refcounted sg_table from a struct drm_mm_node 💫

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🦋 SYNOPSIS 🦋

struct i915_refct_sgt * i915_rsgt_from_mm_node (const struct drm_mm_node
*node , u64 region_start , u32 page_alignment );

like yes bestie that's the whole signature, no notes 💅

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✨ ARGUMENTS ✨

• node — the struct drm_mm_node. that's literally it, that's the whole vibe 🫶
• region_start — an offset you add to the dma addresses of the sg list. think of it as a little head start, a glow-up displacement if you will 💖
• page_alignment — the required page alignment for each sg entry. and bestie, it has to be a power of two — no cap, that's non-negotiable ⚠️

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🔥 DESCRIPTION 🔥

so what it actually does: it creates a struct sg_table, initializing it from a struct drm_mm_node 🧚 and it's out here taking a maximum segment length into account too, splitting into segments if necessary. like it's doing the most and honestly? it ate 💀✨

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🌈 RETURN 🌈

• on success: a pointer to a kmalloced struct i915_refct_sgt 👑 slay
• on failure: a negative error code cast to an error pointer — so yeah, check that IS_ERR() bestie, don't just raw-dog the pointer 😭🙈

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💜 SEE ALSO 💜

• Kernel file ./drivers/gpu/drm/i915/i915_scatterlist.c — go read it, iykyk 📖
• i915_refct_sgt_init(9)
• i915_rsgt_from_buddy_resource(9)

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lowkey important: no invented behaviour here, everything above is fr fr straight from the page. if you need the actual file, it's in ./drivers/gpu/drm/i915 🌟

and that's the whole thing bestie — this page lives in ./drivers/gpu/drm/i915 and it's dated October 2026, so yeah, she's from the future and she's iconic for it 🎀💅🦋⭐