dma_info_to_prot(9)

💖 NAME 💖

okay bestie, meet dma_info_to_prot(9) from the Kernel API Manual — she’s literally the translator of the kernel group chat: she takes DMA API directions and attributes and turns them into IOMMU API page flags ✨🌈

✨ SYNOPSIS ✨

the signature is serving exactly this:

int dma_info_to_prot (enum dma_data_direction dir , bool coherent ,
       unsigned long attrs );

🎀 ARGUMENTS 🎀

• dir — direction of the DMA transfer 🧭
• coherent — is the DMA master cache-coherent? (the question, not a vibe check 😭)
• attrs — DMA attributes for the mapping 🎀

🌸 RETURN 🌸

she returns the corresponding IOMMU API page protection flags — that’s the whole return, no cap 💅

🦋 SEE ALSO 🦋

• Kernel file ./drivers/iommu/dma-iommu.c — the home base, highkey iconic 🏠
• iommu_get_dma_cookie(9)
• iommu_get_msi_cookie(9)
• iommu_put_dma_cookie(9)
• iommu_put_msi_cookie(9)
• iommu_dma_get_resv_regions(9)
• iommu_dma_init_options(9)
• iommu_dma_init_domain(9)
• dma_iova_try_alloc(9)
• dma_iova_free(9)
• dma_iova_link(9)
• dma_iova_sync(9)
• dma_iova_unlink(9)
• dma_iova_destroy(9)

xoxo bestie 💖 source/version: ./drivers/iommu · date: October 2026 · dma_info_to_prot(9) signing off 🎀