xdma_fill_descs(9)

🦋 xdma_fill_descs(9) — the kernel API manual tea 💅

okay so bestie, welcome to xdma_fill_descs(9), straight out of the Kernel API Manual. This is the page for xdma_fill_descs 💖

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✨ NAME ✨

xdma_fill_descs — fill hardware descriptors for one contiguous memory chunk. no cap, that's the whole gig 🫶

and like… plot twist: if the size is bigger than XDMA_DESC_BLEN_MAX, more than one descriptor gets used. she's generous like that ✨ literally one chunk, multiple descs, iconic behaviour.

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🌸 SYNOPSIS 🌸

u32 xdma_fill_descs (struct xdma_desc *sw_desc , u64 src_addr , u64
dst_addr , u32 size , u32 filled_descs_num );

that's the signature, copy it exactly, don't be weird about it 🎀

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💜 ARGUMENTS 💜

• sw_desc — the descriptor container. it's giving "the bag where all the descs live" 👜
• src_addr — the first value for the ->src_addr field 👀 first value, bestie, not the only one
• dst_addr — the first value for the ->dst_addr field 🎯 same energy
• size — size of the contiguous memory block. if this is chunky (bigger than XDMA_DESC_BLEN_MAX), she'll spread across multiple descriptors, periodt 💅
• filled_descs_num — index of the first descriptor to take care of in sw_desc 🔢 that's the starting point, main character of the index world

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🌈 SEE ALSO 🌈

bestie there is SO much lore here, drink water and read the whole list 🍓

• Kernel file ./drivers/dma/xilinx/xdma.c
• struct xdma_desc_block(9)
• struct xdma_chan(9)
• struct xdma_desc(9)
• struct xdma_device(9)
• xdma_link_sg_desc_blocks(9)
• xdma_link_cyclic_desc_blocks(9)
• xdma_channel_init(9)
• xdma_free_desc(9)
• xdma_alloc_desc(9)
• xdma_xfer_start(9)
• xdma_xfer_stop(9)
• xdma_alloc_channels(9)
• xdma_issue_pending(9)
• xdma_terminate_all(9)
• xdma_synchronize(9)
• xdma_prep_device_sg(9)
• xdma_prep_dma_cyclic(9)
• xdma_prep_interleaved_dma(9)
• xdma_device_config(9)
• xdma_free_chan_resources(9)
• xdma_alloc_chan_resources(9)
• xdma_channel_isr(9)
• xdma_irq_fini(9)
• xdma_set_vector_reg(9)
• xdma_irq_init(9)
• xdma_disable_user_irq(9)
• xdma_enable_user_irq(9)
• xdma_get_user_irq(9)
• xdma_remove(9)
• xdma_probe(9)

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💀 no cap, that's every single one of them. i counted. you're welcome.

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okay that's the whole page, bestie 🧚 from ./drivers/dma/xilinx, dated October 2026, and this lil manual page is xdma_fill_descs(9) — slay, go fill some descriptors 💖✨👑