tsi721_cwrite_dma(9)

📦 version 7.3.1, in nixpkgs unstable

💅 tsi721_cwrite_dma ✨

okay so bestie, welcome to the tsi721_cwrite_dma(9) page 💖 this one lives in the Kernel API Manual and it's literally all about generating a RapidIO maintenance write transaction using the Tsi721 BDMA engine. no cap, that's the whole vibe.

✨ SYNOPSIS ✨

int tsi721_cwrite_dma (struct rio_mport *mport , int index , u16 destid
, u8 hopcount , u32 offset , int len , u32 data );

like, that's the whole signature 🫶 she's a little long but she ate.

🎀 ARGUMENTS 🎀

  • mport — the RapidIO master port control structure, aka the main character of this story 👑
  • index — ID of RapdiIO interface (yes, the original page spells it "RapdiIO", and honestly? iconic typo behavior, we keep it 💀)
  • destid — Destination ID of the transaction, like the address of where it's going 🦋
  • hopcount — how many hops to the target device 🧚 literally the travel itinerary
  • offset — offset into configuration space, the exact spot we're poking at 🎯
  • len — length (in bytes) of the maintenance transaction, so we know how much we're moving 🍓
  • data — the value to be written, the actual payload, the moment 💖

🌸 DESCRIPTION 🌸

okay so what does she do? Generates a RapidIO maintenance write transaction. periodt. that's it, that's the whole job 🔥

⭐ RETURN ⭐

  • 0 on success 🎉 slay
  • -EINVAL or -EFAULT on failure 😭 (not every day is a good day, bestie)

💜 SEE ALSO 💜

okay so this is the part where we shout out the whole friend group, and there are a LOT of them, so buckle up 🎀 the kernel file lives at ./drivers/rapidio/devices/tsi721.c and here's everybody:

ngl that's a whole group chat and they all have main character energy 💅

and that's the page, bestie!! 🫶 this one ships from ./drivers/rapidio/devices and it's dated October 2026 ⭐ go forth and write your maintenance transactions, iykyk 💖✨

📦 where this page comes from