atc_tx_status(9)

💅 atc_tx_status(9) — like, the Kernel API Manual page you didn't know you needed

okay so bestie, welcome to atc_tx_status, straight out of the Kernel API Manual ✨ — this is the little function you call when you're like "hey… is my DMA transaction done yet??" 👀

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🌸 NAME

atc_tx_status — poll for transaction completion 🎀

like literally, you're checking whether the thing finished. that's the whole vibe check.

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✨ SYNOPSIS

enum dma_status atc_tx_status (struct dma_chan *chan , dma_cookie_t
cookie , struct dma_tx_state *txstate );

it returns an enum dma_status, bestie. that's the tea you get back ☕

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🫶 ARGUMENTS

• chan — the DMA channel 💫 (your main character)
• cookie — the transaction identifier you're checking the status of 🍪 (yes, it's actually called a cookie, i'm obsessed)
• txstate — if this is not NULL, it gets updated with the transaction state 🔥

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👑 DESCRIPTION

so here's the deal: if txstate is passed in, then once the function returns, it reflects the driver's internal state 🪞 — and you can then use it with dma_async_is_complete to check the status of multiple cookies without re-checking hardware state. no cap, that's the efficiency slay 💅

multiple cookies, one hardware peek. it's giving optimized. it's giving iconic. periodt 🌈

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🦋 SEE ALSO

the whole friend group, fr fr — go say hi to all of them 💜

Kernel file ./drivers/dma/at_hdmac.c 💖

• 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_memcpy(9)
• atc_prep_dma_memset(9)
• atc_prep_slave_sg(9)
• atc_prep_dma_cyclic(9)
• atc_alloc_chan_resources(9)
• atc_free_chan_resources(9)
• at_dma_off(9)

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🫶 okay that's the page!! go poll your transactions, bestie, you're gonna do amazing 💖

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⭐ cute little sign-off: this one lives in ./drivers/dma, it's dated October 2026, and it answers to the name atc_tx_status(9) 🎀 byeeee 💜🌸