iommu_dma_get_resv_regions(9)

🎀 iommu_dma_get_resv_regions(9) 🎀

okay so bestie, this one is from the Kernel API Manual, and it's literally the reserved-region driver helper. No cap, that's the whole vibe. 🦋

🌸 NAME 🌸

iommu_dma_get_resv_regions — Reserved region driver helper ✨

✨ SYNOPSIS ✨

void iommu_dma_get_resv_regions (struct device *dev , struct list_head *list );

🫶 ARGUMENTS 🫶

• dev — the device from iommu_get_resv_regions 🫶
• list — the reserved region list from iommu_get_resv_regions ✨

💅 DESCRIPTION 💅

IOMMU drivers can use this helper to implement their .get_resv_regions callback for general non-IOMMU-specific reservations — main character energy for the non-IOMMU-specific stuff only, periodt. 🔥

Currently, this covers GICv3 ITS region reservation on ACPI based ARM platforms that may require HW MSI reservation. That's the current coverage, fr fr. 🎀

🦋 SEE ALSO 🦋

• Kernel file: ./drivers/iommu/dma-iommu.c 📁
• iommu_get_dma_cookie(9)
• iommu_get_msi_cookie(9)
• iommu_put_dma_cookie(9)
• iommu_put_msi_cookie(9)
• iommu_dma_init_options(9)
• iommu_dma_init_domain(9)
• dma_info_to_prot(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)

🫶 cute little sign-off: source/version vibes are ./drivers/iommu, dated October 2026, from the Kernel API Manual — page iommu_dma_get_resv_regions(9). slay, bye bestie 💅💖