dma_async_is_complete(9)

💫 dma_async_is_complete(9) 💫

okay so bestie, welcome to the Kernel API Manual ✨ this one is dma_async_is_complete, and it is literally the vibe-check function for DMA cookies 🍪

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🌸 NAME 🌸

dma_async_is_complete — test a cookie against chan state 🍪✅

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✨ SYNOPSIS ✨

enum dma_status dma_async_is_complete (dma_cookie_t cookie ,
dma_cookie_t last_complete , dma_cookie_t last_used );

no cap, that's the whole signature 🫶

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🎀 ARGUMENTS 🎀

• cookie — the transaction identifier you're testing the status of 🍪🔍 like, this is the cookie we're asking about
• last_complete — the last known completed transaction 💅 the most recent one we know finished
• last_used — the last cookie value handed out 🎫 the freshest number that got given away

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🦋 DESCRIPTION 🦋

so dma_async_is_complete is the little icon that gets used in dma_async_is_tx_complete 👑 and the reason the logic is split out like this? it's for lightweight testing of multiple cookies 🌈 like, you can check a whole bunch of them without dragging the whole heavy machinery along. lowkey elegant, highkey slay 💅✨

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🔥 SEE ALSO 🔥

kernel file ./include/linux/dmaengine.h 📁 and then, bestie, brace yourself, because the friend group is huge:

• dma_cookie_t(9)
• enum dma_status(9)
• enum dma_transaction_type(9)
• enum dma_transfer_direction(9)
• struct data_chunk(9)
• struct dma_interleaved_template(9)
• struct dma_vec(9)
• enum dma_ctrl_flags(9)
• enum sum_check_bits(9)
• enum sum_check_flags(9)
• enum dma_desc_metadata_mode(9)
• struct dma_chan_percpu(9)
• struct dma_router(9)
• struct dma_chan(9)
• struct dma_chan_dev(9)
• enum dma_slave_buswidth(9)
• struct dma_slave_config(9)
• enum dma_residue_granularity(9)
• struct dma_slave_caps(9)
• dma_filter_fn(9)
• struct dma_async_tx_descriptor(9)
• struct dma_tx_state(9)
• enum dmaengine_alignment(9)
• struct dma_slave_map(9)
• struct dma_filter(9)
• struct dma_device(9)
• dmaengine_prep_peripheral_dma_vec(9)
• dmaengine_prep_config_sg_safe(9)
• dmaengine_prep_config_single_safe(9)
• dmaengine_prep_dma_memset(9)
• dmaengine_terminate_all(9)
• dmaengine_terminate_async(9)
• dmaengine_synchronize(9)
• dmaengine_terminate_sync(9)
• dma_async_issue_pending(9)
• dma_async_is_tx_complete(9)

fr fr, that's the whole group chat 📱💖

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ok and one last thing bestie — this page lives at ./include/linux 📂 and it's dated October 2026 🗓️ so like, mark your calendar, mwah 💋 periodt 👑

hope that helped, ily, go check those cookies 🍪💜