STRUCT DMA_CHAN_PERCPU(9)

✨ struct dma_chan_percpu(9) ✨

okay so bestie, we're in the Kernel API Manual today and the star of the show is struct dma_chan_percpu(9) — literally the per-CPU part of struct dma_chan. yes, that struct dma_chan. it's giving "small but crucial supporting character" energy and honestly? we respect it. 💅

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🌸 NAME 🌸

struct dma_chan_percpu — the per-CPU part of struct dma_chan. no cap, that's the whole pitch. 🎀

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✨ SYNOPSIS ✨

here's the shape of it, verbatim, don't touch anything:

struct dma_chan_percpu {
    unsigned long memcpy_count;
    unsigned long bytes_transferred;
};

like, that's it. two fields. minimal. iconic. 🦋

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💖 Members 💖

• memcpy_count — the transaction counter. it counts transactions. that's the vibe. 🔥
• bytes_transferred — the byte counter. it counts bytes. very demure, very mindful. 🌸

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👑 SEE ALSO 👑

first up, the source file to go look at:

Kernel file ./include/linux/dmaengine.h — and then the whole friend group of related pages, in order:

• 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_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)
• dma_async_is_complete(9)

like, that's the whole gc right there. go read them, iykyk. 📚✨

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and that's the page!! sourced from the kernel file in ./include/linux, dated October 2026, and yes this is struct dma_chan_percpu(9) signing off. mwah 💋 stay slay, stay per-CPU 🫶