arm_iommu_sync_sg_for_cpu(9)

💖 NAME 💖

Bestie, welcome to the arm_iommu_sync_sg_for_cpu(9) page from the Kernel API Manual ✨. The NAME section is arm_iommu_sync_sg_for_cpu — and the description after the dash is literally blank. No extra lore here, periodt 🫶.

🌸 SYNOPSIS 🌸

void arm_iommu_sync_sg_for_cpu (struct device *dev , struct scatterlist
       *sg , int nents , enum dma_data_direction dir );

The synopsis says void, so no return value is showing up here, bestie 💅.

🎀 ARGUMENTS 🎀

• dev — a valid struct device pointer. Valid device pointer energy only 🦋.
• sg — list of buffers. It's giving scatterlist buffet, no cap 😭.
• nents — number of buffers to map (returned from dma_map_sg). Keep that parenthetical, iykyk 💖.
• dir — DMA transfer direction (same as was passed to dma_map_sg). Same direction, no plot twist 💅.

👑 SEE ALSO 👑

The kernel file in question is ./arch/arm/mm/dma-mapping.c, and these are the linked besties:

• arm_iommu_map_sg(9)
• arm_iommu_unmap_sg(9)
• arm_iommu_sync_sg_for_device(9)
• arm_iommu_map_phys(9)
• arm_iommu_create_mapping(9)
• arm_iommu_attach_device(9)
• arm_iommu_detach_device(9)

Cute little sign-off, bestie: source/version is ./arch/arm/mm, date is October 2026 🌈💜. That's the footer, and we ate 🎀✨.