STRUCT DRM_PAGEMAP_ADDR(9)

💅 struct drm_pagemap_addr(9) 💅

okay so bestie, welcome to the Kernel API Manual — this is the page for struct drm_pagemap_addr, and honestly it's giving "small struct, big responsibilities" energy ✨

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🌸 NAME 🌸

struct drm_pagemap_addr — Address representation. That's it. That's the whole vibe. It's a struct that represents an address. Simple queen behavior 👑

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✨ SYNOPSIS ✨

struct drm_pagemap_addr {
    dma_addr_t addr;
    u64 proto : 54;
    u64 order : 8;
    u64 dir : 2;
 };

look at those bitfields. 54 + 8 + 2 🔥 do the math, it's literally 64. the packing is real.

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🎀 Members 🎀

• addr — this is the dma address, or a driver-defined address for driver private interconnects. so yeah, it's either the standard thing or your driver's own little custom situation. iykyk 💅
• proto — the interconnect protocol. which protocol? that one. the interconnect one 🦋
• order — the page order of the device mapping, and before you ask, the size is PAGE_SIZE << order. yes, shift left by order. no cap, that's the formula 📐
• dir — the DMA direction. that's it. it's the direction. of DMA. 🧭

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💀 Note 💀

There is room for improvement here. We should be able to pack into 64 bits.

ngl, the manpage itself is out here being self-aware 😭 it's literally saying "we could do better, we should be able to pack into 64 bits." icon energy: being honest about your own flaws. we love growth 🫶

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🦋 SEE ALSO 🦋

Kernel file ./include/drm/drm_pagemap.h enum

• drm_interconnect_protocol(9)
• drm_pagemap_addr_encode(9)
• struct drm_pagemap_ops(9)
• struct drm_pagemap(9)
• struct drm_pagemap_devmem_ops(9)
• drm_pagemap_get(9)
• drm_pagemap_get_unless_zero(9)
• struct drm_pagemap_devmem(9)
• struct drm_pagemap_migrate_details(9)
• drm_pagemap_page_zone_device_data(9)

like, go read all of these. the whole pagemap cinematic universe is right there 🍓

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aaaand that's the page, bestie 💖 sourced from ./include/drm, dated October 2026 — mwah, slay, periodt 👑🌸