read_properties_unlocked(9)

📦 version 7.3.1, in nixpkgs unstable

✨ NAME ✨

okay bestie, welcome to read_properties_unlocked(9) from the Kernel API Manual 💖 — this is the page for validate + copy userspace stream open properties. It’s giving “check every property on its own” energy, and honestly? Iconic. 🎀

🦋 SYNOPSIS 🦋

int read_properties_unlocked (struct i915_perf *perf , u64 __user
       *uprops , u32 n_props , struct perf_open_properties *props );

🎀 ARGUMENTS 🎀

  • perf — the i915 perf instance, obviously 💅
  • uprops — the array of u64 key value pairs that userspace handed over ✨
  • n_props — the number of key value pairs we expect in uprops 🔢
  • props — the stream configuration that gets built up while the properties are being validated 🛠️

🌸 DESCRIPTION 🌸

okay so listen: this function only validates properties in isolation. It does not validate that the combination of properties makes sense, and it does not validate that all properties necessary for a particular kind of stream have been set. That’s the assignment. 👑

real talk, bestie: isolated checks only — no group-project validation here 😭

Also, there currently aren’t any ordering requirements for properties, so we shouldn’t validate or assume anything about ordering here. This doesn’t rule out defining new properties with ordering requirements in the future, though. Future icon behavior stays future icon behavior. 🔮

💜 SEE ALSO 💜

The kernel file is ./drivers/gpu/drm/i915/i915_perf.c — and here’s the whole SEE ALSO squad, no cap:

made with 💖 from ./drivers/gpu/drm/i915, October 2026 — catch u later, bestie! 🫶✨

📦 where this page comes from