dwc2_hsotg_map_dma(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dwc2_hsotg_map_dma ✨

okay so this is a page from the Kernel API Manual (the (9) section, kernel developer besties 🫶) and we're talking about dwc2_hsotg_map_dma. no cap, it's a little guy with a big job. let's get into it 🌸

🎀 NAME 🎀

dwc2_hsotg_map_dma — literally maps the DMA memory that's being used for the request 💖

✨ SYNOPSIS ✨

int dwc2_hsotg_map_dma (struct dwc2_hsotg *hsotg , struct dwc2_hsotg_ep
*hs_ep , struct usb_request *req );

that's the whole signature, exactly as it lives, no edits from me 💅

🦋 ARGUMENTS 🦋

  • hsotg — the device state. the main character of the struct world 👑
  • hs_ep — the endpoint the request is riding on 🌈
  • req — the request currently being processed, aka the whole reason we're here 🍓

🌸 DESCRIPTION 🌸

so here's the vibe check: somebody asked us to queue a request, so the assignment is making sure that memory buffer is correctly set up for DMA. periodt ✨

if we've been handed an extant DMA address, then make sure the buffer has been synced to memory. fr fr, that's step one.

but if our buffer has no DMA memory, then we map the memory and mark our request so we can clean up on completion later 🧚 that's the glow-up AND the tidy-up, all in one call 💅

💜 SEE ALSO 💜

kernel file ./drivers/usb/dwc2/gadget.c (iykyk 🫶), plus the whole friend group:

that's the whole group chat, nobody left on read 💀💖

and that's the page!! this icon of a manpage lives in ./drivers/usb/dwc2 and it's dated October 2026 — so yeah, future-flavored kernel lore ⭐ slay, go map some DMA bestie 🧚‍♀️✨

📦 where this page comes from