ENUM DMA_SLAVE_BUSWIDTH(9)

💅 NAME 💅

okay so bestie, this is the enum dma_slave_buswidth page from the Kernel API Manual, and it literally defines the bus width of the DMA slave device — source or target buses. that's the whole vibe. no cap. 🦋

✨ SYNOPSIS ✨

here's the whole enum, copied exactly, because we do not mess with code in this group chat:

enum dma_slave_buswidth {
    DMA_SLAVE_BUSWIDTH_UNDEFINED ,
    DMA_SLAVE_BUSWIDTH_1_BYTE ,
    DMA_SLAVE_BUSWIDTH_2_BYTES ,
    DMA_SLAVE_BUSWIDTH_3_BYTES ,
    DMA_SLAVE_BUSWIDTH_4_BYTES ,
    DMA_SLAVE_BUSWIDTH_8_BYTES ,
    DMA_SLAVE_BUSWIDTH_16_BYTES ,
    DMA_SLAVE_BUSWIDTH_32_BYTES ,
    DMA_SLAVE_BUSWIDTH_64_BYTES ,
    DMA_SLAVE_BUSWIDTH_128_BYTES

};

🎀 Constants 🎀

so the source doc is a little iconic in the worst way: every single constant is listed as -- undescribed --. not me being lazy, that's literally what the page says. we're keeping it real and keeping every one. 💀

• DMA_SLAVE_BUSWIDTH_UNDEFINED — -- undescribed -- in the original, so no invented lore here. 🙈
• DMA_SLAVE_BUSWIDTH_1_BYTE — -- undescribed -- in the original. one byte, one mystery. 🍓
• DMA_SLAVE_BUSWIDTH_2_BYTES — -- undescribed -- in the original. 🎀
• DMA_SLAVE_BUSWIDTH_3_BYTES — -- undescribed -- in the original. yes, 3. it's giving specific. 💅
• DMA_SLAVE_BUSWIDTH_4_BYTES — -- undescribed -- in the original. 🌸
• DMA_SLAVE_BUSWIDTH_8_BYTES — -- undescribed -- in the original. ✨
• DMA_SLAVE_BUSWIDTH_16_BYTES — -- undescribed -- in the original. 🦋
• DMA_SLAVE_BUSWIDTH_32_BYTES — -- undescribed -- in the original. 🔥
• DMA_SLAVE_BUSWIDTH_64_BYTES — -- undescribed -- in the original. 👑
• DMA_SLAVE_BUSWIDTH_128_BYTES — -- undescribed -- in the original. big width energy, still no description. 🌈

bestie, the takeaway is simple: every constant name is real and exact, and the description field is empty in the source. do not let anyone tell you otherwise. 🫶

👀 SEE ALSO 👀

the source page points at the kernel file ./include/linux/dmaengine.h and then a whole friend group of references. all of them, exactly as written:

• 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)
• 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)

the original also names the kernel file ./include/linux/dmaengine.h right at the front of this section, so there it is, no crumbs left behind. 💖

and that's the page, bestie. it lives under ./include/linux, it's dated October 2026, and it's literally the enum dma_slave_buswidth(9) page from the Kernel API Manual. periodt. 💅✨