STRUCT DMA_ROUTER(9)

🦋 struct dma_router 🦋

okay bestie, welcome to the Kernel API Manual — this one's a short lil baddie but she's important, trust. it's all about struct dma_router, and ngl she's giving "small but powerful" main character energy 💅

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✨ NAME ✨

struct dma_router — the DMA router structure 🎀

like, that's literally her whole job description. iconic of her tbh.

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🌸 SYNOPSIS 🌸

here's the whole vibe, bestie — look at her, so compact, so cute:

struct dma_router {
    struct device *dev;
    void (*route_free)(struct device *dev, void *route_data);
 };

that's it. two members. she said "I don't need a thousand fields, I need two good ones." periodt 💀

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🎀 Members 🎀

okay so let's go through her members one by one, because there's only two and honestly we love an efficient queen 👑

• dev — a pointer to the DMA router device. this is literally the struct device * that says "hi, this is the device we're talking about." no device, no router, y'know? 🫶
• route_free — a function that gets called when the route can be disconnected. look at her signature fr fr: void (*route_free)(struct device *dev, void *route_data); — she takes the struct device *dev and a void *route_data, and she's the one you call when it's time to tear that route down. clean up after yourself, bestie ✨

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🔥 SEE ALSO 🔥

bestie, buckle up, because this list is long — she's got a whole friend group and they all live in the kernel file ./include/linux/dmaengine.h 💖

• 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_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, thirty-six entries. thirty-six!! she knows everyone at the party 🌈👑

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lowkey a reminder bestie: this page is a struct reference, so the members above are the whole technical story — no hidden behavior, no extra defaults, nothing sneaky. what you see is what you get 🧚

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and that's the whole page, bestie! this one came from the kernel source dir ./include/linux, dated October 2026, and it's filed as struct dma_router(9) in the Kernel API Manual 💜 go forth and route some DMA, you absolute icon 🦋✨