amdgpu_debu..._pcie64_read(9)

📦 version 7.3.1, in nixpkgs unstable

💅 amdgpu_debugfs_regs_pcie64_read(9) — like, the Kernel API Manual, bestie ✨

okay so real talk, we're in the Kernel API Manual today and this little function is genuinely iconic for one very specific reason: it reads a 64-bit PCIE register and honestly? that's the whole vibe. no cap.

✨ NAME ✨

amdgpu_debugfs_regs_pcie64_read — literally just Read from a 64-bit PCIE register. that's it. that's the function. sixty-four bits of register-reading excellence, periodt 💅

🎀 SYNOPSIS 🎀

ssize_t amdgpu_debugfs_regs_pcie64_read (struct file *f , char __user
*buf , size_t size , loff_t *pos );

like, look at her. she's a ssize_t returning queen and she takes four things. we love a signature that knows what it wants 🫶

🌸 ARGUMENTS 🌸

  • f — the open file handle, aka the main character of this whole operation. someone's gotta be holding the file open, and it's her.
  • buf — the user buffer where we're gonna stash the read data. this is her house, we're just storing bytes in it 💖
  • size — Number of bytes to read. how many bytes are we pulling? she decides.
  • pos — Offset to seek to. the coordinates. where in the register we're dropping anchor. lowkey important ngl ⚓

🦋 SEE ALSO 🦋

the whole friend group showed up, and they ate 🔥 first up, the Kernel file itself:

./drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c

and the rest of the squad, in order:

the way there's a _read and a _write for basically every single one of them? balanced. symmetrical. highkey satisfying 😭

ngl bestie, the pcie64 lineup is the pair you wanna remember — read gets you the data, write puts it back, and amdgpu_debugfs_regs_init(9) is the one who set the whole thing up in the first place 👑

and that's the page!! sourced straight from ./drivers/gpu/drm/amd/amdgpu, dated October 2026 — so go forth, read your 64-bit PCIE registers, and slay 💜🌈✨

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