snd_pcm_lib_mmap_iomem(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 snd_pcm_lib_mmap_iomem(9) 🎀

okay bestie, so this page is from the Kernel API Manual — it's a section 9 manpage, which is kernel-dev territory, so buckle up buttercup 💅

✨ NAME ✨

snd_pcm_lib_mmap_iomem — the Default PCM data mmap function for I/O mem. that's it, that's the whole vibe 🦋

✨ SYNOPSIS ✨

int snd_pcm_lib_mmap_iomem (struct snd_pcm_substream *substream , struct
vm_area_struct *area );

like, literally just that one function. iconic of her honestly 👑

✨ ARGUMENTS ✨

  • substream — your PCM substream 💖 the whole reason we're here
  • area — the VMA. yes, the virtual memory area. she's got range 🎀

✨ DESCRIPTION ✨

okay so listen 🫶 if your hardware is using the iomapped pages as the hardware buffer and it wants to mmap that bad boy, then this is the function you pass as the mmap pcm_ops. that's the whole assignment, no cap.

⚠️ but like, heads up — this is supposed to work only on limited architectures. so don't be out here assuming it's gonna slay everywhere, mmkay? 😭

✨ RETURN ✨

  • zero if it worked — we love a successful function ✨
  • a negative error code if it didn't — sad girl hours 💀

✨ SEE ALSO ✨

the kernel file lives at ./sound/core/pcm_native.c, and honestly the whole squad is linked here so let me introduce you 🌈

that's the whole page bestie, go forth and mmap responsibly 🧚💜

mwah 💋 — this one came out of ./sound/core and the version stamp says October 2026, so like, very much current, very much giving main character energy ⭐

📦 where this page comes from