dmaengine_prep_dma_memset(9)

🌸 dmaengine_prep_dma_memset(9) 🌸

okay bestie, welcome to the Kernel API Manual 💖 this is a kernel-internals page, so grab a lil snack — we're setting up a DMA memset descriptor and it's gonna be iconic.

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✨ NAME ✨

dmaengine_prep_dma_memset — prepare a DMA memset descriptor 🎀

Like, you're prepping it. Not launching it. Promise. It's giving "outfit laid out the night before" energy, not "already at the party" energy 💅

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✨ SYNOPSIS ✨

struct dma_async_tx_descriptor * dmaengine_prep_dma_memset (struct
dma_chan *chan , dma_addr_t dest , int value , size_t len , unsigned
long flags );

look at her. five args. all business. 🫶

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✨ ARGUMENTS ✨

• chan — the channel you're using for this descriptor ✨ like, which DMA engine is doing the work, bestie. gotta pick one.
• dest — the address of the buffer to be set 🎯 this is where the magic lands.
• value — treated as a single byte value that fills the destination buffer 🍓 so like... one byte, copied everywhere. that's the whole vibe. don't come in here expecting a 32-bit word, okay? single byte. periodt.
• len — the total size of dest 📏 how much of it we're filling.
• flags — DMA engine flags 🚩 the flags, from the DMA engine. them.

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✨ SEE ALSO ✨

the whole friend group 💜 the kernel file ./include/linux/dmaengine.h plus literally everyone in the DMA roster:

• 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_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)

go read them. iykyk 💀✨

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ngl bestie, there's no OPTIONS section on this one — she's a straight-up function page, no flags to scroll through. you're welcome 😭

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aaaand that's the page!! 🦋 brought to you straight out of ./include/linux, dated October 2026, by your fave Kernel API Manual — no cap, she ate 💅👑🌈