ipc_pcie_addr_map(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ipc_pcie_addr_map — a kernel API manual moment (section 9, bestie)

okay so real talk, this is ipc_pcie_addr_map from the Kernel API Manual, section 9, and it's genuinely one of those little functions that's doing the absolute most behind the scenes ✨

🌸 NAME 🌸

ipc_pcie_addr_map — bestie, what it does is take the kernel's virtual address and map it over to either the IOVA address space or the Physical address space (pick your fighter 💅), and then that mapping gets stashed away in the skb's cb. that's the whole vibe. no cap.

🎀 SYNOPSIS 🎀

int ipc_pcie_addr_map (struct iosm_pcie *ipc_pcie , unsigned char *data
, size_t size , dma_addr_t *mapping , int direction );

like, look at her. iconic signature. five arguments, one int return, zero notes. 🦋

✨ ARGUMENTS ✨

  • ipc_pcie — pointer to struct iosm_pcie. she's the main character, everything routes through her 👑
  • data — the skb mem containing the data. yes, that skb. the one whose cb we're about to fill 🫶
  • size — the data size. how much data we're talking about, fr fr
  • mapping — the DMA mapping address. this is where the mapped address lands 💫
  • direction — the data direction. which way the data's going, iykyk 🌈

🔥 RETURN 🔥

  • 0 on success 🎉 — slay, it worked
  • a failure value on error 😭 — not slay, something went wrong
no in-between, bestie. it's either the 0 glow-up or the failure arc. 💀

🌟 SEE ALSO 🌟

first up, the kernel file itself, go read it:

./drivers/net/wwan/iosm/iosm_ipc_pcie.h

and then the whole friend group, because of course there's a whole friend group:

like, that's the group chat. they all get it. 💜

and that's the page! 🧚 source lives in <pink>./drivers/net/wwan/iosm</pink>, dated October 2026, and she's filed under ipc_pcie_addr_map(9) — mwah, kiss the manual, bye bestie! 💅🎀

📦 where this page comes from