drm_gem_dumb_map_offset(9)

📦 version 7.3.1, in nixpkgs unstable

✨ drm_gem_dumb_map_offset(9) ✨

okay bestie, welcome to the Kernel API Manual page for drm_gem_dumb_map_offset — yes, the one and only. it's giving kernel-internals realness, and we're gonna get through it together. 💖

🎀 NAME 🎀

drm_gem_dumb_map_offset — return the fake mmap offset for a gem object. no cap, that's the whole name vibe. 💅

🌈 SYNOPSIS 🌈

int drm_gem_dumb_map_offset (struct drm_file *file , struct drm_device
       *dev , u32 handle , u64 *offset );

💅 ARGUMENTS 💅

  • file — the drm file-private structure containing the gem object. like, it's the file's private little gem holder. 🫶
  • dev — the corresponding drm_device. the device bae. ✨
  • handle — the gem object handle. iconic. 🎀
  • offset — return location for the fake mmap offset. yes, fake — that's literally the wording, don't come for me. 💀

✨ DESCRIPTION ✨

so this function implements the drm_driver.dumb_map_offset kms driver callback for drivers which use gem to manage their backing storage. that's the whole flex. it's the callback implementation, and the gem-managed-backing-storage drivers are the target audience. 👑

🫶 RETURN 🫶

0 on success or a negative error code on failure. periodt. if it's not 0, it's a negative error code, and that's the whole return story. 😭

🦋 SEE ALSO 🦋

the kernel file is ./drivers/gpu/drm/drm_gem.c, and here's the whole friend group of related pages — all of them, no skipping, bestie:

and that's the page, bestie. this lil sign-off comes from the footer: source/version is ./drivers/gpu/drm, date is October 2026, and the page is drm_gem_dumb_map_offset(9) from the Kernel API Manual. slay, you made it to the end. 💖✨🎀

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