swiotlb_find_pool(9)

💅 swiotlb_find_pool(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — today's main character is swiotlb_find_pool, and honestly? she's a little detective and she ate 🔍💖

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🌸 NAME 🌸

swiotlb_find_pool — literally finds the swiotlb pool that a physical address belongs to 🎀 iykyk

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✨ SYNOPSIS ✨

struct io_tlb_pool * swiotlb_find_pool (struct device *dev , phys_addr_t paddr );

that's the whole vibe. two args in, one pointer out 🫶

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🦋 ARGUMENTS 🦋

• dev — the device that has mapped the buffer. like, which device's business is this? 👀 that one.
• paddr — a physical address that lives inside the DMA buffer. the address in question, the one we're investigating 🔎

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💜 DESCRIPTION 💜

so basically she takes paddr and finds the swiotlb pool that paddr points into. that's it. that's the job. no cap, that's the entire description and she does it flawlessly 💅

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⭐ RETURN ⭐

• the pool address — if paddr points into a bounce buffer 🎉 slay
• NULL — if paddr does not point into a bounce buffer 🫠

and because of that lil NULL situation, you can literally use this function to figure out whether paddr denotes a swiotlb bounce buffer or not. it's giving "two functions in a trench coat" 😭 iconic

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🌈 SEE ALSO 🌈

• kernel file ./include/linux/swiotlb.h
• struct io_tlb_pool(9)
• struct io_tlb_mem(9)

go read those too, bestie, they're the supporting cast 👑

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mwah 💋 that's the whole page — brought to you by ./include/linux, the October 2026 edition, and the letter swiotlb_find_pool(9) 💖✨ go find those pools, queen 🧚‍♀️