ccio_map_single(9)

💖 NAME 💖

ccio_map_single — Map an address range into the IOMMU.

Okay bestie, yes: this is ccio_map_single(9) from the Kernel API Manual, and its whole vibe is mapping an address range into the IOMMU. Iconic, honestly.

🦋 SYNOPSIS 🦋

Here's the signature — copy it exactly, no cap:

dma_addr_t  ccio_map_single (struct device *dev , phys_addr_t addr , size_t size , enum dma_data_direction direction );

🌸 ARGUMENTS 🌸

• dev — The PCI device. That's the device in question, bestie.
• addr — The physical address of the DMA region. Physical. Address. periodt.
• size — The length of the DMA region. The size matters, obviously.
• direction — The direction of the DMA transaction (to/from device). Yes, which way the DMA is going.

✨ DESCRIPTION ✨

This function implements the pci_map_single function. That's the whole description, and honestly? It ate. No notes.

🎀 SEE ALSO 🎀

Kernel file: ./drivers/parisc/ccio-dma.c — go read the source, iykyk. Then these icon functions are all right here:

• ccio_alloc_range(9)
• ccio_free_range(9)
• ccio_io_pdir_entry(9)
• ccio_clear_io_tlb(9)
• ccio_mark_invalid(9)
• ccio_dma_supported(9)
• ccio_unmap_phys(9)
• ccio_alloc(9)
• ccio_free(9)
• ccio_map_sg(9)
• ccio_unmap_sg(9)
• ccio_find_ioc(9)
• ccio_get_iommu(9)
• ccio_ioc_init(9)
• ccio_probe(9)
• ccio_init(9)

xoxo, sending love from the ./drivers/parisc source bestie — October 2026, ccio_map_single(9) 🫶💅