amdgpu_debug...s_didt_write(9)

📦 version 7.3.1, in nixpkgs unstable

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

okay so this is a page from the Kernel API Manual, and the function we're obsessing over is amdgpu_debugfs_regs_didt_write — yes the header truncates it to amdgpu_debug...s_didt_write(9) because names this long are simply too iconic for one line 🎀

✨ NAME ✨

amdgpu_debugfs_regs_didt_write — literally writes to a DIDT register. that's the whole vibe. no cap 💅

🦋 SYNOPSIS 🦋

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

she takes four arguments and returns an ssize_t, and honestly? slay 🫶

🌸 ARGUMENTS 🌸

  • f — the open file handle. like, the file you already have open, bestie, that one 🎀
  • buf — the user buffer you're pulling the data from to write. it's the user buffer, so mind your manners ✨
  • size — number of bytes to write. how many bytes, you ask? this many. exactly this many 💅
  • pos — offset to seek to. she's giving "where are we even" energy 🦋

👑 DESCRIPTION 👑

ok so here's the tea, and it's actually good tea 🍓:

the lower bits are the BYTE offset of the register to write. and the way that works means you can write multiple registers in a single call — one call, many registers, main character energy — and the returned size reflects that, so you know exactly how much got done 🔥

like, the return value is doing the receipts for you. no need to guess, she tells you. periodt 💖

🌈 SEE ALSO 🌈

bestie, the lore expands. the kernel file lives right here:

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

and here's the whole friend group, all of them, in order, no skips 💜:

and that's the whole page, bestie — every argument, every register function, every crumb of lore, preserved 💅✨

this came to you from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's filed under amdgpu_debug...s_didt_write(9) — go forth and write those registers, icon 🎀🦋🌸

📦 where this page comes from