atc_prep_dma_memcpy(9)

💅 atc_prep_dma_memcpy(9) 💅

okay so bestie, welcome to the Kernel API Manual, page atc_prep_dma_memcpy(9) — yes that's the whole title, and yes we are gonna get through it together, hand in hand, matching manicures and everything 🫶✨

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✨ NAME ✨

atc_prep_dma_memcpy — lowkey the function that prepares a memcpy operation 🎀

Like, it doesn't do the copying itself, it's the little backstage crew putting the operation together. main character energy but in a supportive way, yk? 💖

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🌸 SYNOPSIS 🌸

struct dma_async_tx_descriptor * atc_prep_dma_memcpy (struct dma_chan
*chan , dma_addr_t dest , dma_addr_t src , size_t len , unsigned long
flags );

it returns a struct dma_async_tx_descriptor *, no cap, and it takes exactly these five things ⬇️💅

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🦋 ARGUMENTS 🦋

• chan — the channel to prepare the operation on. like, which lane we doing this in, bestie 🌈
• dest — operation virtual destination address. this is where the stuff goes 🎯
• src — operation virtual source address. this is where the stuff comes from 🍓
• len — operation length. how much we're moving, periodt 📏
• flags — tx descriptor status flags. the lil status flags riding along with the descriptor 🏷️

ngl, that's the whole argument list — five args, no mystery, we ate 🔥

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👑 SEE ALSO 👑

go read these next, iykyk 💜 — the kernel file ./drivers/dma/at_hdmac.c lives here too, so like, everything's connected bestie:

• struct atdma_sg(9)
• struct at_desc(9)
• enum atc_status(9)
• struct at_dma_chan(9)
• struct at_dma(9)
• atc_chan_is_enabled(9)
• atc_chan_is_paused(9)
• atc_chan_is_cyclic(9)
• set_lli_eol(9)
• struct at_dma_platform_data(9)
• struct at_dma_slave(9)
• atc_dostart(9)
• atc_calc_bytes_left(9)
• atc_get_llis_residue(9)
• atc_get_residue(9)
• atc_handle_error(9)
• atc_prep_dma_interleaved(9)
• atc_prep_dma_memset(9)
• atc_prep_slave_sg(9)
• atc_prep_dma_cyclic(9)
• atc_tx_status(9)
• atc_alloc_chan_resources(9)
• atc_free_chan_resources(9)
• at_dma_off(9)

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and that's the whole page, bestie, you absolutely devoured it 💀👑

little sign-off moment: this one lives over in ./drivers/dma 🎀, and it's dated October 2026 ⭐ — so yeah, stay tuned for the future, it's giving timeless documentation fr fr 💖✨🦋