sba_free_range(9)

💖 sba_free_range(9) 💖

okay so bestie, welcome to the Kernel API Manual, section 9 — today’s main character is sba_free_range, and she is literally here to unmark bits. No cap. 🦋

🌸 NAME 🌸

<pink>sba_free_range</pink> — unmark bits in IO PDIR resource bitmap. That’s the assignment, and she ate. 💅

✨ SYNOPSIS ✨

void sba_free_range (struct ioc *ioc , dma_addr_t iova , size_t size );

It’s void, so no return value is coming back to you — just vibes and cleared bits. 🫶

🎀 ARGUMENTS 🎀

• ioc — the IO MMU structure which owns the pdir we are interested in. Like, this is the struct with main character energy here 👑.
• iova — the IO virtual address which was previously allocated. It already had its moment; now it’s in this function’s contacts 💅.
• size — the number of bytes to create a mapping for. Yes bestie, that is exactly what the page says — I’m just relaying the lore fr fr 😭.

💅 DESCRIPTION 💅

Okay so the description is short and iconic: this function clears bits in the ioc’s resource map. That’s the whole assignment. Clear bits, be gorgeous, leave. ✨

The way that this is just one tiny line of description and still manages to serve is honestly obsessed behavior. No extra plot twists are listed here — it’s giving minimal, it’s giving bitmap cleanup, it’s giving iykyk. 🌈

🌈 SEE ALSO 🌈

The whole squad, the ensemble cast, the link party — every single one, exactly as listed:

• Kernel file ./drivers/parisc/sba_iommu.c
• sba_dump_ranges(9)
• sba_dump_tlb(9)
• sba_dump_pdir_entry(9)
• sba_check_pdir(9)
• sba_dump_sg(9)
• sba_search_bitmap(9)
• sba_alloc_range(9)
• sba_io_pdir_entry(9)
• sba_mark_invalid(9)
• sba_dma_supported(9)
• sba_map_single(9)
• sba_unmap_phys(9)
• sba_alloc(9)
• sba_free(9)
• sba_map_sg(9)
• sba_unmap_sg(9)
• sba_get_iommu(9)
• sba_directed_lmmio(9)
• sba_distributed_lmmio(9)

xoxo, your fave kernel bestie 💜 — source/version: ./drivers/parisc, dated October 2026. Slay and read your man pages. 💅