i915_sg_dma_sizes(9)

✨ i915_sg_dma_sizes(9) ✨

okay bestie, welcome to the i915_sg_dma_sizes(9) page from the Kernel API Manual. this one is short, sweet, and very much “do one thing well” energy. 💅

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🎀 NAME 🎀

i915_sg_dma_sizes — Record the dma segment sizes of a scatterlist

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🛠 SYNOPSIS 🛠

unsigned int i915_sg_dma_sizes (struct scatterlist *sg );

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🌸 ARGUMENTS 🌸

• sg — The scatterlist. that’s the whole argument, bestie. one scatterlist, no cap. 🫶

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⭐ RETURN ⭐

it returns an unsigned int with segment sizes logically or'ed together. ✨

so a caller can use this info to determine what hardware page table entry sizes can be used to map the memory represented by the scatterlist. that’s the vibe check: caller gets the bits, caller figures out which hardware page table entry sizes are usable. 🔥

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🦋 SEE ALSO 🦋

the kernel file ./drivers/gpu/drm/i915/i915_scatterlist.h is where this whole situation lives, and these are the friends in the group chat:

• __sg_next(9)
• __for_each_sgt_daddr(9)
• __for_each_daddr_next(9)
• for_each_sgt_page(9)
• struct i915_refct_sgt_ops(9)
• struct i915_refct_sgt(9)
• i915_refct_sgt_put(9)
• i915_refct_sgt_get(9)
• __i915_refct_sgt_init(9)

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💖 tiny sign-off: this page is chillin’ under ./drivers/gpu/drm/i915, dated October 2026, and it’s literally the i915_sg_dma_sizes(9) manual page. slay. 🎀✨