arch_setup_msi_irq(9)

⭐ arch_setup_msi_irq(9) ⭐

okay so welcome to the Kernel API Manual, bestie — today’s main character is arch_setup_msi_irq, and it’s literally the MSI IRQ setup era. 💖✨

🎀 NAME 🎀

arch_setup_msi_irq — setup MSI IRQs for a device. periodt. 💅

✨ SYNOPSIS ✨

int arch_setup_msi_irq (struct pci_dev *dev , struct msi_desc *desc );

💅 ARGUMENTS 💅

• dev — the device that’s requesting MSI interrupts. main character energy fr 👑
• desc — the MSI descriptor. the little receipt for the MSI situation 🧾✨

🔥 DESCRIPTION 🔥

So this routine gets called when a driver requests MSI interrupts instead of the legacy INT A-D, and it’s giving upgrade era. 💅 It will allocate multiple interrupts for MSI devices that support them. no cap.

A device can override this by programming the MSI control bits [6:4] before calling pci_enable_msi. that’s the little escape hatch, iykyk 🦋

🌈 RETURN 🌈

• 0 on success — slay ✅
• non-0 on error — not slay, handle it 😭

🦋 SEE ALSO 🦋

• Kernel file ./arch/mips/pci/msi-octeon.c
• arch_teardown_msi_irq(9)

mwah 💋 this page is from ./arch/mips/pci, dated October 2026, and it’s filed under arch_setup_msi_irq(9) — bye bestie 🫶🌸