STRUCT MSM_MMU_PREALLOC(9)

💅 struct msm_mmu_prealloc(9) — the Kernel API Manual page you didn't know you needed 🎀

Okay so bestie, welcome to struct msm_mmu_prealloc(9), straight out of the Kernel API Manual. This is the little bookkeeping queen that keeps track of pre-allocated pages for MMU updates. She's not doing the glamorous work — she's the one holding the pages so nobody has to panic-allocate mid-update. And honestly? Main character energy. ✨

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🌸 NAME 🌸

struct msm_mmu_prealloc — tracking for pre-allocated pages for MMU updates. That's it, that's the whole job description. She tracks. She preallocates. She slays. 🫶

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🦋 SYNOPSIS 🦋

Here's her whole lewk, character for character, don't touch a single semicolon:

struct msm_mmu_prealloc {
    uint32_t count;
    uint32_t ptr;
    void **pages;
 };

Yes the closing brace has a little extra space in front of it. That's her vibe. We respect it. ✨

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💖 Members 💖

So there are three members, and they're all lowkey iconic in their own way:

• count — number of pages reserved. She's the headcount babe, keeping track of how many pages this struct has claimed for herself. 🔥
• ptr — index of first unused page in pages. Think of her as the little pointer finger going "this one's still free, this one's still free". 👑
• pages — array of pages preallocated for MMU table updates. This is the stash. The page pile. The whole reason we're here. 🎀

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🧚 The cleanup lore (a.k.a. the little paragraph that follows the members) 💜

Okay so after a VM operation, there might be free pages chillen leftover in this array — because, and hear me out, the amount allocated is a worst-case scenario. So like, sometimes you don't need every single page, and that's fine. Those extras don't get abandoned, bestie, no cap. They get returned to the pt_cache at mmu->prealloc_cleanup. Circular economy of pages fr fr. ♻️😭

Not me being emotionally attached to a cleanup callback. 🙈

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/gpu/drm/msm/msm_mmu.h — go look at the actual header, iykyk. 🦋

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And that's the page, babe! Sign-off time: this beauty lives in the source tree at ./drivers/gpu/drm/msm, and it's dated October 2026. Slay, periodt. 💅🌈✨