pci_msi_supported(9)

💅 pci_msi_supported(9) 💅

okay bestie, welcome to the Kernel API Manual glow-up for pci_msi_supported — the function that runs a whole vibe check on MSI before anyone enables it. ✨

🌸 NAME 🌸

pci_msi_supported — check whether MSI may be enabled on a device. 💖

🦋 SYNOPSIS 🦋

int pci_msi_supported (struct pci_dev *dev , int nvec );

🎀 ARGUMENTS 🎀

• dev — pointer to the pci_dev data structure of the MSI device function. Like, here's the device we're checking, bestie. 🫶
• nvec — how many MSIs have been requested? That's the count, periodt. 🔢

✨ DESCRIPTION ✨

So what does it actually do? It looks at the global flags, the device itself, and its parent buses to figure out if MSI/-X are supported for the device. If MSI/-X is supported, it returns 1; otherwise it returns 0. That's the whole tea. ☕💅

🔥 SEE ALSO 🔥

• Kernel file ./drivers/pci/msi/msi.c
• pci_msi_mask_irq(9)
• pci_msi_unmask_irq(9)
• msi_capability_init(9)
• pci_msi_vec_count(9)
• msix_prepare_msi_desc(9)
• msix_capability_init(9)
• pci_msix_write_tph_tag(9)

with love from the source path ./drivers/pci/msi, dated October 2026 — slay and goodbye 💌👑