xilinx_dpdm...lloc_tx_desc(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 xilinx_dpdma_chan_alloc_tx_desc — section 9, from the Kernel API Manual 💅

okay bestie, welcome to one of those tiny little manpage entries that looks like it's gonna be short and then the SEE ALSO section just keeps going forever 😭 like, ma'am, why are there that many friends. anyway. this is xilinx_dpdma_chan_alloc_tx_desc, straight out of the kernel API manual, section 9 no cap ✨

✨ SYNOPSIS ✨

struct xilinx_dpdma_tx_desc * xilinx_dpdma_chan_alloc_tx_desc (struct
xilinx_dpdma_chan *chan );

it's giving one function, one argument, zero drama. we love a signature that fits on two lines 🎀

🫶 ARGUMENTS 🫶

  • chan — your DPDMA channel 💖 this is literally the only thing you hand over. the channel is the main character here, the whole function is about it.

🌈 DESCRIPTION 🌈

so what does it do? it allocates a tx descriptor. that's it. that's the whole vibe. 🦋

not me hyping up a one-liner — but lowkey this is the kind of helper that keeps the whole xilinx_dpdma thing running, and you gotta respect it. you give it a channel, it goes and gets you a transaction descriptor. iconic behavior, no notes 👑

⭐ RETURN ⭐

it hands you back a tx descriptor… or NULL 😭 and fr fr, check for that NULL, bestie. no guessing games about what a NULL means here — the page just says it can happen, and you should be ready for it. a vibe check on the return value is always the move 💅

👑 SEE ALSO 👑

bestie. sit down. this list is LONG. but every single one of these is here because the page says so, and we do not skip the boring parts in this house 🫶

the kernel file lives at ./drivers/dma/xilinx/xilinx_dpdma.c — that's the whole neighborhood these functions are from 🏡

the struct girlies:

  • struct xilinx_dpdma_hw_desc(9)
  • struct xilinx_dpdma_sw_desc(9)
  • struct xilinx_dpdma_tx_desc(9)
  • struct xilinx_dpdma_chan(9)
  • struct xilinx_dpdma_device(9)

descriptor-adjacent besties:

prep + transfer squad:

on/off and pause-core:

outstanding-transfer lore (ostand girlies, ily):

irq + error handling angels:

channel resources + teardown, the practical girlies:

irq enable/disable, the switches:

periodt 💜 that's the full list, every last one, exactly as the page gives it.

and that's the whole entry, bestie 🧚 this came from ./drivers/dma/xilinx, dated October 2026, in the Kernel API Manual — shoutout to whoever wrote it, you ate 🌸 go forth and allocate responsibly 💖

📦 where this page comes from