default_swiotlb_limit(9)

🎀 default_swiotlb_limit(9) 🎀

okay so this page is from the Kernel API Manual, and the function in question is default_swiotlb_limit. She's lowkey tiny, but she's here to spill one very specific address tea. 💅

💖 NAME 💖

default_swiotlb_limit — get the address limit of the default SWIOTLB.

✨ SYNOPSIS ✨

phys_addr_t default_swiotlb_limit (void );

It returns a phys_addr_t, bestie. That's the type. 🫶

🎀 ARGUMENTS 🎀

• void — no arguments. literally none. not a single one. 😌

🌸 DESCRIPTION 🌸

So here's the vibe: this function gets the highest physical address used by the default software IO TLB pool. That's it. That's the whole errand. ✨

No extra lore, no plot twist — just the highest physical address of the default software IO TLB pool, served fresh. 🍓

💜 SEE ALSO 💜

if you're in your research era, go peek at these:

• 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_find_pool(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)

mwah 💋 — source/version was ./kernel/dma, dated October 2026, and this whole cute little page is default_swiotlb_limit(9). periodt. 🦋