xilinx_dma_calc_copysize(9)

✨ NAME ✨

xilinx_dma_calc_copysize — literally just calculates how much data needs to be copied 💅

So okay, this is a page from the Kernel API Manual (yes that's the manual name, we're fancy here), and it's all about one little function that does one little job: math on copy sizes. Let's get into it bestie 🫶

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🌸 SYNOPSIS 🌸

int xilinx_dma_calc_copysize (struct xilinx_dma_chan *chan , int size ,
int done );

That's the whole signature, no cap. Takes a channel, takes some sizes, gives you back an int. Iconic, honestly.

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🎀 ARGUMENTS 🎀

• chan — the driver-specific DMA channel 🦋 like, the actual channel this is all happening on.
• size — the total amount of data that needs to be copied. the whole snack. 🍓
• done — the amount of data that has already been copied. the part you already ate, bestie 😭

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👑 RETURN 👑

Returns the amount of data that has to be copied. That's it, that's the vibe check result. ✨

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💜 SEE ALSO 💜

Sibling functions, structs, and enums — the whole group chat 🫶 and also the kernel file they all live in:

• Kernel file ./drivers/dma/xilinx/xilinx_dma.c
• struct xilinx_vdma_desc_hw(9)
• struct xilinx_axidma_desc_hw(9)
• struct xilinx_aximcdma_desc_hw(9)
• struct xilinx_cdma_desc_hw(9)
• struct xilinx_vdma_tx_segment(9)
• struct xilinx_axidma_tx_segment(9)
• struct xilinx_aximcdma_tx_segment(9)
• struct xilinx_cdma_tx_segment(9)
• struct xilinx_dma_tx_descriptor(9)
• struct xilinx_dma_chan(9)
• enum xdma_ip_type(9)
• struct xilinx_dma_device(9)
• vdma_desc_write_64(9)
• xilinx_dma_get_metadata_ptr(9)
• xilinx_vdma_alloc_tx_segment(9)
• xilinx_cdma_alloc_tx_segment(9)
• xilinx_axidma_alloc_tx_segment(9)
• xilinx_aximcdma_alloc_tx_segment(9)
• xilinx_dma_free_tx_segment(9)
• xilinx_mcdma_free_tx_segment(9)
• xilinx_cdma_free_tx_segment(9)
• xilinx_vdma_free_tx_segment(9)
• xilinx_dma_alloc_tx_descriptor(9)
• xilinx_dma_free_tx_descriptor(9)
• xilinx_dma_free_desc_list(9)
• xilinx_dma_free_descriptors(9)
• xilinx_dma_free_chan_resources(9)
• xilinx_dma_get_residue(9)
• xilinx_dma_chan_handle_cyclic(9)
• xilinx_dma_chan_desc_cleanup(9)
• xilinx_dma_do_tasklet(9)
• xilinx_dma_alloc_chan_resources(9)
• xilinx_dma_tx_status(9)
• xilinx_dma_stop_transfer(9)
• xilinx_cdma_stop_transfer(9)
• xilinx_dma_start(9)
• xilinx_vdma_start_transfer(9)
• xilinx_cdma_start_transfer(9)
• xilinx_dma_start_transfer(9)
• xilinx_mcdma_start_transfer(9)
• xilinx_dma_issue_pending(9)
• xilinx_dma_device_config(9)
• xilinx_dma_complete_descriptor(9)
• xilinx_dma_reset(9)
• xilinx_dma_chan_reset(9)
• xilinx_mcdma_irq_handler(9)
• xilinx_dma_irq_handler(9)
• append_desc_queue(9)
• xilinx_dma_tx_submit(9)
• xilinx_vdma_dma_prep_interleaved(9)
• xilinx_cdma_prep_memcpy(9)
• xilinx_dma_prep_peripheral_dma_vec(9)
• xilinx_dma_prep_slave_sg(9)
• xilinx_dma_prep_dma_cyclic(9)
• xilinx_mcdma_prep_slave_sg(9)
• xilinx_dma_terminate_all(9)
• xilinx_vdma_channel_set_config(9)
• xilinx_dma_chan_remove(9)
• xilinx_dma_chan_probe(9)
• xilinx_dma_child_probe(9)
• of_dma_xilinx_xlate(9)
• xilinx_dma_probe(9)
• xilinx_dma_remove(9)

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That's the whole page, bestie, go forth and copy exactly the right number of bytes 💖✨

source location: ./drivers/dma/xilinx · dated: October 2026 · xilinx_dma_calc_copysize(9) — mwah, see u in the kernel source 🧚💅