fsl_rio_tx_handler(9)

💌 fsl_rio_tx_handler(9) — the Kernel API Manual glow-up

okay so bestie, you found it: fsl_rio_tx_handler, straight out of the Kernel API Manual. It's a lil interrupt handler and honestly it's giving unsung hero energy — no cap, nobody talks about it but everything would fall apart without it 💅

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✨ NAME ✨

fsl_rio_tx_handler — the MPC85xx outbound message interrupt handler 🦋 that's literally the whole vibe: it handles the interrupts that fire when outbound messages do their thing.

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🌸 SYNOPSIS 🌸

irqreturn_t fsl_rio_tx_handler (int irq , void *dev_instance );

yeah that's the whole signature, she's short and she knows it 🎀

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🎯 ARGUMENTS 🎯

• irq — the Linux interrupt number. like, which interrupt are we even talking about, bestie 🔢
• dev_instance — a pointer to the interrupt-specific data. it's the little bag of context that gets passed along 🙈

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💖 DESCRIPTION 💖

So here's what she does 👑 — fsl_rio_tx_handler handles outbound message interrupts. That's her whole job and she does it slayfully:

1. it executes a register outbound mailbox event handler 💌
2. and then it acks the interrupt occurrence ✅ — because leaving an interrupt unacked is not the move, fr fr

that's it. that's the function. short, sweet, absolutely iconic, periodt 🔥

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🔗 SEE ALSO 🔗

the whole friend group 🫶 go say hi:

• Kernel file ./arch/powerpc/sysdev/fsl_rmu.c
• fsl_rio_rx_handler(9)
• fsl_rio_dbell_handler(9)
• fsl_rio_port_write_handler(9)
• fsl_rio_pw_enable(9)
• fsl_rio_port_write_init(9)
• fsl_rio_doorbell_send(9)
• fsl_add_outb_message(9)
• fsl_open_outb_mbox(9)
• fsl_close_outb_mbox(9)
• fsl_open_inb_mbox(9)
• fsl_close_inb_mbox(9)
• fsl_add_inb_buffer(9)
• fsl_get_inb_message(9)
• fsl_rio_doorbell_init(9)

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ngl if you're reading a kernel interrupt handler manpage at this hour, you're the main character. hydrate, then insmod 🍓

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and that's the tea 🧚 this page lives in ./arch/powerpc/sysdev and it's stamped October 2026 — so when you cite it in your group chat, that's the receipt, iykyk 💜