msm_iommu_pa...ble_alloc_pt(9)

✨ msm_iommu_pagetable_alloc_pt(9) ✨

okay bestie, buckle up 💅 this one's from the Kernel API Manual, and it's literally the page-table allocator for MSM's IOMMU but make it fancy. no cap, it's a custom allocator and it's kind of iconic.

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🌸 NAME 🌸

msm_iommu_pagetable_alloc_pt — the custom page table allocator. that's her. that's the whole vibe 🎀

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🦋 SYNOPSIS 🦋

void * msm_iommu_pagetable_alloc_pt (void *cookie , size_t size , gfp_t
gfp );

like, she takes three things and hands you back a void *. simple. elegant. slay.

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💖 DESCRIPTION 💖

so the why here is genuinely the best part 🫶 we want a custom allocator so we can use a cache for page table allocations, and that lets us amortize the cost of the over-reservation that's done to allow asynchronous VM operations. iykyk — it's giving efficiency main character energy ✨

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🎀 ARGUMENTS 🎀

• cookie — the cookie that was passed at page table allocation time. just hand her back her own cookie, bestie 🍪
• size — the size of the page table. this one should be fixed, and it's determined at creation time based on the granule size. so like, don't be weird about it 💀
• gfp — the GFP flags. yes, those ones 🌈

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⭐ RETURN ⭐

non-NULL on success 🎉 and NULL if the allocation failed for any reason 😭 — any reason at all, she's not gonna elaborate, them's the breaks.

fr fr though: check for NULL. your future self will thank you 💜

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/msm/msm_iommu.c
• msm_iommu_pagetable_free_pt(9) — her partner in crime, the one who cleans up after the party 🧚

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and that's the page, bestie! 👑 source: ./drivers/gpu/drm/msm, dated October 2026 — so mark your calendars and stan responsibly 💖🌸🦋