arm_iommu_map_phys(9)

💖 arm_iommu_map_phys(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — this is arm_iommu_map_phys(9), and no, the NAME section lowkey has no description, that's just how it ships, we don't ask questions 🫶

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🌸 NAME 🌸

arm_iommu_map_phys — and that's literally it, the description slot is empty, the void, nothing there, so don't come for me 😭 (the manual genuinely leaves it blank, fr fr)

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✨ SYNOPSIS ✨

dma_addr_t arm_iommu_map_phys (struct device *dev , phys_addr_t phys ,
       size_t size , enum dma_data_direction dir , unsigned long attrs );

so it hands you back a dma_addr_t, that's the vibe 💅

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🎀 ARGUMENTS 🎀

• dev — a valid struct device pointer 👑 and yes valid is doing a LOT of heavy lifting in that sentence, please respect it
• phys — the physical address that the buffer resides in 📍 that's its whole home address
• size — size of the buffer to map, like how much of it we're claiming 🌸
• dir — the DMA transfer direction, iykyk 🦋
• attrs — the DMA mapping attributes ✨ lil extra seasoning

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💀 DESCRIPTION 💀

it's the IOMMU aware version of arm_dma_map_page 🧚 that's the entire description, she's concise, she's iconic, she said what she said periodt 🔥

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🌈 SEE ALSO 🌈

• the kernel file ./arch/arm/mm/dma-mapping.c — go read the source bestie, it's giving main character energy 👑
• arm_iommu_map_sg(9)
• arm_iommu_unmap_sg(9)
• arm_iommu_sync_sg_for_cpu(9)
• arm_iommu_sync_sg_for_device(9)
• arm_iommu_create_mapping(9)
• arm_iommu_attach_device(9)
• arm_iommu_detach_device(9)

like, the whole friend group, they roll together 🫶

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ngl bestie this one's a shortie — but every single one of those eight SEE ALSO pages is listed up there, no cap, I didn't skip a single one 🙈

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and that's the page!! 🍓 this little gem lives in ./arch/arm/mm and the date on it is October 2026, so mark your calendar ⭐ mwah, go map some physical memory for your device, slay 💜