da8xx_rproc_callback(9)

💅 da8xx_rproc_callback(9) 💅

okay so this is a page from the Kernel API Manual bestie, and we're about to get into it — it's all about da8xx_rproc_callback, the inbound virtqueue message handler. yes, that's a lot of syllables. we're gonna slay it tho 🫶

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✨ NAME ✨

da8xx_rproc_callback — the inbound virtqueue message handler. that's the whole vibe. it handles messages coming in from a virtqueue. iconic behavior honestly 💖

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🦋 SYNOPSIS 🦋

irqreturn_t da8xx_rproc_callback (int irq , void *p );

literally just those two args. no more, no less. periodt.

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🎀 ARGUMENTS 🎀

• irq — okay so the docs say -- undescribed -- and honestly? the docs are giving nothing. we don't know what this one is, and I refuse to make something up. mystery king 👑
• p — also -- undescribed --. same situation. it's a void *, it exists, that's all we've got 💀

ngl, the original page didn't describe these and I'm not about to invent lore. facts are facts, bestie.

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🌸 DESCRIPTION 🌸

so here's the tea: this handler gets invoked directly by the kernel whenever the remote core — that's the DSP — has modified the state of a virtqueue. like, the kernel just calls it. no middleman. main character energy fr fr ✨

and here's the part that's lowkey important: there is no "payload" message telling you which virtqueue index it is. which, if you've seen the mailbox-based implementations on OMAP4, is exactly what those ones do have. so we don't get that little cheat code here 🙈

because of that, this handler has to "polls" each known virtqueue index — every single time it's invoked. not once, not sometimes. every invocation. she's checking everyone's vibe check manually, one by one, no skipping 💅

so like, the quotes around "polls" are straight from the original, and the "payload" quotes are too. not me adding drama — that's just how it was written 🎀

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🔥 SEE ALSO 🔥

• the kernel file ./drivers/remoteproc/da8xx_remoteproc.c
• struct da8xx_rproc_mem(9)
• struct da8xx_rproc(9)
• handle_event(9)

go read those if you want the full cinematic universe bestie, iykyk ⭐

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and that's the whole page!! 🧚 this gem lives over in ./drivers/remoteproc and it's dated October 2026 — so yeah, mark your calendars, this is a future-fresh little manpage. mwah 💋🍓