xilinx_dpdma_synchronize(9)

💅 xilinx_dpdma_synchronize(9) 💅

okay bestie so this is from the Kernel API Manual and it's lowkey one of those "wait for everything to chill out" functions, and honestly it's giving responsible main character energy. let's get into it 🫶

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✨ NAME ✨

xilinx_dpdma_synchronize — synchronize callback execution, aka make sure all the vibes have actually settled before you move on 🌸

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✨ SYNOPSIS ✨

void xilinx_dpdma_synchronize (struct dma_chan *dchan );

that's it. one function, one argument, no return value, it literally just... waits. iconic behaviour honestly 💅

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✨ ARGUMENTS ✨

• dchan — the DMA channel. that's the whole thing. one (1) parameter and it's your DMA channel 🎀

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✨ DESCRIPTION ✨

so when you synchronize callback execution, what you're promising is that all the transfers you already issued have finished, and all the callbacks associated with them have been called and have returned. like, everyone's home, the party's over, doors are locked. no cap ✅

this function waits for the DMA channel to stop. 🛑

but here's the part where you gotta pay attention, bestie, because it assumes things:

• it assumes the channel has already been paused by a previous call to dmaengine_terminate_async 💤
• it assumes no new pending descriptors have been issued with dma_async_issue_pending 🚫📨

⚠️ and if those assumptions are wrong? the behaviour is undefined. like not "oops it's slow" undefined, actually undefined. that's the scary kind. do not test the universe on this one 😭💀

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✨ SEE ALSO ✨

the whole squad, fr fr. all of these live in the kernel file ./drivers/dma/xilinx/xilinx_dpdma.c — go read it, it ate 👑

• struct xilinx_dpdma_hw_desc(9)
• struct xilinx_dpdma_sw_desc(9)
• struct xilinx_dpdma_tx_desc(9)
• struct xilinx_dpdma_chan(9)
• struct xilinx_dpdma_device(9)
• xilinx_dpdma_sw_desc_set_dma_addrs(9)
• xilinx_dpdma_chan_alloc_sw_desc(9)
• xilinx_dpdma_chan_free_sw_desc(9)
• xilinx_dpdma_chan_dump_tx_desc(9)
• xilinx_dpdma_chan_alloc_tx_desc(9)
• xilinx_dpdma_chan_free_tx_desc(9)
• xilinx_dpdma_chan_prep_cyclic(9)
• xilinx_dpdma_chan_prep_interleaved_dma(9)
• xilinx_dpdma_chan_enable(9)
• xilinx_dpdma_chan_disable(9)
• xilinx_dpdma_chan_pause(9)
• xilinx_dpdma_chan_unpause(9)
• xilinx_dpdma_chan_queue_transfer(9)
• xilinx_dpdma_chan_ostand(9)
• xilinx_dpdma_chan_notify_no_ostand(9)
• xilinx_dpdma_chan_wait_no_ostand(9)
• xilinx_dpdma_chan_poll_no_ostand(9)
• xilinx_dpdma_chan_stop(9)
• xilinx_dpdma_chan_done_irq(9)
• xilinx_dpdma_chan_vsync_irq(9)
• xilinx_dpdma_chan_err(9)
• xilinx_dpdma_chan_handle_err(9)
• xilinx_dpdma_alloc_chan_resources(9)
• xilinx_dpdma_free_chan_resources(9)
• xilinx_dpdma_terminate_all(9)
• xilinx_dpdma_err(9)
• xilinx_dpdma_handle_err_irq(9)
• xilinx_dpdma_enable_irq(9)
• xilinx_dpdma_disable_irq(9)
• xilinx_dpdma_chan_err_task(9)

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aaaand that's the page! 💖 sign-off time: this one comes from ./drivers/dma/xilinx and it's dated October 2026. go forth and synchronize responsibly, bestie — and remember, no dma_async_issue_pending shenanigans or the universe gets undefined on you 🌈⭐🧚