__swiotlb_find_pool(9)

💖 NAME 💖

okay so bestie, welcome to __swiotlb_find_pool(9) from the Kernel API Manual ✨. This function is literally here to find the IO TLB pool for a physical address. no cap 💅.

🌸 SYNOPSIS 🌸

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

🎀 ARGUMENTS 🎀

• dev — the device which has mapped the DMA buffer 👑.
• paddr — the physical address within the DMA buffer 📍.

🦋 DESCRIPTION 🦋

So the vibe is: find the IO TLB memory pool descriptor which contains the given physical address, if any 🔍. That's it, that's the quest.

🚨 caveat, bestie: this function is for use only when the dev is known to be using swiotlb. Use swiotlb_find_pool for the more general case when this condition is not met. iykyk 💀.

💅 RETURN 💅

Memory pool which contains paddr, or NULL if none 😭.

🌈 SEE ALSO 🌈

bestie, go peek at these if you're feeling curious 🧚:

• Kernel file ./kernel/dma/swiotlb.c
• struct io_tlb_slot(9)
• struct io_tlb_area(9)
• swiotlb_adjust_nareas(9)
• limit_nareas(9)
• add_mem_pool(9)
• alloc_dma_pages(9)
• swiotlb_alloc_tlb(9)
• swiotlb_free_tlb(9)
• swiotlb_alloc_pool(9)
• swiotlb_dyn_alloc(9)
• swiotlb_del_pool(9)
• swiotlb_dev_init(9)
• swiotlb_align_offset(9)
• swiotlb_search_pool_area(9)
• swiotlb_search_area(9)
• swiotlb_find_slots(9)
• mem_pool_used(9)
• mem_used(9)
• swiotlb_tbl_map_single(9)
• swiotlb_del_transient(9)
• is_swiotlb_allocated(9)
• default_swiotlb_base(9)
• default_swiotlb_limit(9)

mwah 💋 — source/version check: ./kernel/dma, date: October 2026, and yes it's literally the __swiotlb_find_pool(9) page 🫶.