STRUCT DMA_SLAVE_MAP(9)

🌸 struct dma_slave_map(9) 🌸

okay bestie, so this is a page straight out of the Kernel API Manual — yes, the actual kernel, not a vibe. it's about struct dma_slave_map, which is the little matchmaker struct that links a slave device and its slave channel to a parameter that a filter function is gonna use later. it's giving wingman energy, fr fr 💅

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✨ NAME ✨

struct dma_slave_map — associates slave device and it's slave channel with parameter to be used by a filter function 🎀

like, it's the intro card at the party that says "this device, this channel, and this mysterious param go together, the filter function will know what to do with it" 🦋

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✨ SYNOPSIS ✨

struct dma_slave_map {
    const char *devname;
    const char *slave;
    void *param;
 };

three fields, all main character, no notes 💜

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💖 Members 💖

• devname — name of the device. the actual device name string, lowkey the whole identity of the thing 🎀
• slave — slave channel name. yes that's what it's called, that's the field name, keep it exactly as-is bestie 🙈
• param — opaque parameter to pass to struct dma_filter.fn. "opaque" here is not a dig, it literally means the kernel isn't looking inside it — it just hands it straight to the filter function and trusts the vibes 😭

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👑 SEE ALSO 👑

Kernel file ./include/linux/dmaengine.h — and then, bestie, brace yourself, the whole friend group showed up:

• 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_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)

that's not a SEE ALSO, that's a whole groupchat roll call 🔥 read them all, they're all linked for a reason, iykyk ⭐

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ngl, param being void * and described as "opaque" is your reminder that you do NOT get to peek inside it here. the filter function handles that. stay in your lane, respectfully 🫶

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and that's the whole page, bestie — filed under ./include/linux, dated October 2026, still called struct dma_slave_map(9) even after all this 💀 slay, go read the dmaengine header, mwah 💖🎀✨