afu_dma_region_add(9)

💅 afu_dma_region_add(9) — like, the whole glow-up

okay bestie, welcome to the Kernel API Manual ✨ this one's all about afu_dma_region_add(9), and honestly? she's a tiny little function with main character energy 🎀

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🌸 NAME 🌸

afu_dma_region_add — adds the given dma region to the rbtree 💖

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✨ SYNOPSIS ✨

int afu_dma_region_add (struct dfl_feature_dev_data *fdata , struct
       dfl_afu_dma_region *region );

like yes, that's the whole signature, no cap 🫶

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🦋 ARGUMENTS 🦋

• fdata — the feature dev data, she's the vibe holder 🧚
• region — the dma region that's getting added, the guest of honour 💅

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🔥 DESCRIPTION 🔥

So here's the tea ☕ — she returns 0 for success, and -EEXIST if the dma region has already been added. Like, girl, you're already in the tree, we see you 🙈

⚠️ okay this part is important, do NOT skip it: needs to be called with fdata->lock held. literally hold the lock. it's giving "please don't rawdog the concurrency" 😭

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👑 SEE ALSO 👑

Kernel file ./drivers/fpga/dfl-afu-dma-region.c — and her whole friend group, fr fr:

• afu_dma_pin_pages(9)
• afu_dma_unpin_pages(9)
• afu_dma_check_continuous_pages(9)
• dma_region_check_iova(9)
• afu_dma_region_remove(9)
• afu_dma_region_destroy(9)
• afu_dma_region_find(9)
• afu_dma_region_find_iova(9)
• afu_dma_map_region(9)
• afu_dma_unmap_region(9)

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🌈 and that's the page!! sourced from ./drivers/fpga, dated October 2026 — mwah, slay, periodt 💜⭐