dma_iova_unlink(9)

💫 dma_iova_unlink(9) 💫

okay so bestie, welcome to the Kernel API Manual — this one's a kernel-level page, section 9, and it's literally all about unlinking a range of IOVA space. no cap. let's get into it 🎀

---

🌸 NAME 🌸

dma_iova_unlink — unlink a range of IOVA space ✨

---

🦋 SYNOPSIS 🦋

void dma_iova_unlink (struct device *dev , struct dma_iova_state *state
, size_t offset , size_t size , enum dma_data_direction dir , unsigned
long attrs );

it returns void, so like… nothing comes back. it just does the thing 💅

---

💖 ARGUMENTS 💖

• dev — the DMA device. your main character device, fr fr 🫶
• state — the IOVA state. this is the vibe we're operating on.
• offset — offset into the IOVA state to unlink. like, where in the state do we start 👀
• size — size of the buffer. how much of it we're talking about.
• dir — DMA direction. it's an enum dma_data_direction, so yk how it is.
• attrs — attributes of mapping properties. the little extras 🔥

---

✨ DESCRIPTION ✨

so what it does is: unlink a range of IOVA space for the given IOVA state. that's the whole thing. that's the assignment. it ate and left no crumbs 🌈

lowkey important: it's scoped to the given IOVA state — that's the state arg doing the heavy lifting 💜

---

👑 SEE ALSO 👑

kernel file ./drivers/iommu/dma-iommu.c — go read it, iykyk 🧚, plus these iconic little friends:

• 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_info_to_prot(9)
• dma_iova_try_alloc(9)
• dma_iova_free(9)
• dma_iova_link(9)
• dma_iova_sync(9)
• dma_iova_destroy(9)

---

and that's the page, bestie! 🍓

signed, sealed, delivered: this one came out of ./drivers/iommu, stamped October 2026, and it's officially dma_iova_unlink(9). slay 💅✨