sdma_v4_4_2_vm_write_pte(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sdma_v4_4_2_vm_write_pte(9) 💅

okay bestie, so we're deep in the Kernel API Manual today — like, section 9, kernel-space, no userspace shenanigans. This one's a function page. Buckle up 🎀

✨ NAME ✨

sdma_v4_4_2_vm_write_pte — literally just updating PTEs by writing them manually, by hand, the old-fashioned way 🫶

✨ SYNOPSIS ✨

void sdma_v4_4_2_vm_write_pte (struct amdgpu_ib *ib , uint64_t pe ,
uint64_t value , unsigned count , uint32_t incr );

no cap, that's the whole signature. she takes five args and returns nothing (void, she gives nothing back, main character energy 💅).

✨ ARGUMENTS ✨

  • ib — the indirect buffer you're filling with commands. this is the canvas, the vibe receptacle 🎨
  • pe — the addr of the page entry. yes, addr, not address, that's how the page spells it, don't come for me 🙈
  • value — the dst addr to write into pe. the destination. the final form. the glow-up ✨
  • count — number of page entries to update. how many of them we're doing. could be one, could be a whole squad 👯‍♀️
  • incr — increase next addr by incr bytes. the step size, the stride, the little hop between entries 🦋

✨ DESCRIPTION ✨

Update PTEs by writing them manually using sDMA.

that's it. that's the whole description. no hand-holding, no lore, just: you want those page table entries updated? you write them. manually. with sDMA doing the work. it's giving "do it yourself but make it hardware-accelerated" 🔥

lowkey iconic that the description is one sentence long and still eats 💀

🌈 SEE ALSO 🌈

first up, the kernel file herself lives right here — go read the source, bestie:

./drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c

and then the whole friend group, the entire sdma_v4_4_2 squad, all of them, in order, no one left behind 🫶:

like, that's twenty-nine siblings. big family. love that for them 💖

ngl bestie, PTEs are serious business — you're touching page tables here. write them wrong and the whole VM vibe checks out permanently. be careful, mwah 😭

and that's the page! 🦋 source dir is ./drivers/gpu/drm/amd/amdgpu, and the manual's dated October 2026 — so this page is, like, from the future?? periodt. 💜

📦 where this page comes from