ccio_unmap_phys(9)

📦 version 7.3.1, in nixpkgs unstable

okay so bestie, this is ccio_unmap_phys(9) from the Kernel API Manual, and it's giving “clean up that DMA address range” energy. no cap, today we're unmapping from the IOMMU. 💅

💖 NAME 💖

ccio_unmap_phys — unmap an address range from the IOMMU. periodt.

🌸 SYNOPSIS 🌸

void  ccio_unmap_phys (struct device *dev , dma_addr_t iova , size_t
size , enum dma_data_direction direction , unsigned long attrs );

✨ ARGUMENTS ✨

okay so here's the cast, and yes every single one matters:

  • struct device *dev — the PCI device. that's the whole vibe.
  • dma_addr_t iova — the start address of the DMA region. iconic starting point, fr fr.
  • size_t size — the length of the DMA region. gotta know how much we're working with 💖
  • enum dma_data_direction direction — the direction of the DMA transaction (to/from device). yes, direction girlies rise 🫶
  • unsigned long attrs — attributes. and that's literally it, bestie, the whole description 😭

🔥 SEE ALSO 🔥

the kernel file ./drivers/parisc/ccio-dma.c is the main character here, and the whole squad rolls deep:

mwah 💋 — from the ./drivers/parisc source/version, dated October 2026, page ccio_unmap_phys(9) 🫶

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