interconnect_fn(9)

💅 interconnect_fn(9) — a Kernel API Manual moment

okay bestie, welcome to interconnect_fn(9) from the Kernel API Manual, and honestly? she's a little function with a big job. Let's get into it 🫶

---

✨ NAME ✨

interconnect_fn — the callback function that figures out whether two things are connected by a fast interconnect 🔥

---

🦋 SYNOPSIS 🦋

bool interconnect_fn (struct drm_pagemap_peer *peer1 , struct
drm_pagemap_peer *peer2 );

---

🎀 ARGUMENTS 🎀

• peer1 — the first endpoint. one half of our lil duo 💖
• peer2 — the second endpoint. the other half 🫶

---

🌸 DESCRIPTION 🌸

So here's the vibe: the function returns true iff peer1 and peer2 have a fast interconnect. iykyk ✨

but wait — heads up, bestie: this is symmetrical. the function has no notion of client and provider, which may not be sufficient in some cases 😭. like, it literally does not care who's who, it just answers the question.

and there's a reason for that, okay? because the callback is intended to guide in providing common pagemap owners, so the notion of a common owner to indicate fast interconnects would then have to change as well. that's the whole tradeoff, and it's iconic of them to be upfront about it 💅

---

👑 RETURN 👑

true iff peer1 and peer2 have a fast interconnect. otherwise false. that's it, that's the whole answer, no cap 💀

---

🌈 SEE ALSO 🌈

the whole friend group shows up here, so let's give them their moment:

• Kernel file ./drivers/gpu/drm/drm_pagemap_util.c
• struct drm_pagemap_cache(9)
• struct drm_pagemap_shrinker(9)
• drm_pagemap_cache_create_devm(9)
• Cache lookup(9)
• drm_pagemap_cache_lock_lookup(9)
• drm_pagemap_cache_unlock_lookup(9)
• drm_pagemap_get_from_cache(9)
• drm_pagemap_cache_set_pagemap(9)
• drm_pagemap_get_from_cache_if_active(9)
• drm_pagemap_shrinker_might_lock(9)
• drm_pagemap_shrinker_add(9)
• drm_pagemap_shrinker_create_devm(9)
• struct drm_pagemap_owner(9)
• drm_pagemap_release_owner(9)
• drm_pagemap_acquire_owner(9)

---

⭐ sign-off ⭐

this page lives in ./drivers/gpu/drm, dated October 2026, and it's part of the Kernel API Manual — interconnect_fn(9), periodt 💜 go read the rest of the pagemap girlies, they ate 🍓✨