afu_mmio_re...et_by_offset(9)

💅 afu_mmio_region_get_by_offset — Kernel API Manual ✨

okay so bestie, we're in the <pink>kernel API manual</pink> today and the star of the show is afu_mmio_region_get_by_offset(9) 🎀 — that's the section 9 girlies, kernel functions only, no cap.

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🌸 NAME 🌸

afu_mmio_region_get_by_offset — literally finds an afu mmio region by <italic>offset</italic> and <italic>size</italic> 🦋

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✨ SYNOPSIS ✨

int afu_mmio_region_get_by_offset (struct dfl_feature_dev_data *fdata ,
u64 offset , u64 size , struct dfl_afu_mmio_region *pregion );

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🎀 ARGUMENTS 🎀

• fdata — the afu feature dev data. yes it's that girl 💖
• offset — the region offset, measured from the start of the device fd. counting from the top, periodt 📏
• size — the region size. how much region we're talking about 🌈
• pregion — a ptr to the region for the result. that's where the answer goes, bestie 🫶

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💜 DESCRIPTION 💜

Okay so here's the vibe: it finds the region that fully contains the region described by the input parameters (offset and size) — and it goes looking for it in the feature dev's region linked list 🔥

like… fully contains. not "kind of overlaps," not "is adjacent to." fully. vibe check passed only if the whole thing fits inside. 👑

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⭐ RETURN ⭐

• 0 on success 🎉
• a negative error code otherwise 😭 (not me getting a negative back…)

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/fpga/dfl-afu-region.c
• afu_mmio_region_init(9)
• afu_mmio_region_add(9)
• afu_mmio_region_destroy(9)
• afu_mmio_region_get_by_index(9)

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ngl, go read dfl-afu-region.c if you want the full lore — the whole friend group lives in there 💀

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and that's the page!! mwah 💋 this one's brought to you by the <purple>./drivers/fpga</purple> girlies, dated <cyan>October 2026</cyan> — <rainbow>afu_mmio_region_get_by_offset(9)</rainbow> out, slay, see you in the next manpage 🧚‍♀️💅🌸