__libie_pci_get_mmio_addr(9)

💅 __libie_pci_get_mmio_addr — like, the whole vibe

okay so bestie, welcome to the Kernel API Manual ✨ and specifically to section 9 and to __libie_pci_get_mmio_addr, which is genuinely one of those little helpers that just works and we love her for it 🫶

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🌸 NAME 🌸

__libie_pci_get_mmio_addr — get the MMIO virtual address 🔥

✨ SYNOPSIS ✨

void __iomem * __libie_pci_get_mmio_addr (struct libie_mmio_info
*mmio_info , resource_size_t offset , int num_args , ... );

no cap, that's the whole signature — she takes a pointer, an offset, a count, and then vibes with whatever else you hand her 💅

🎀 ARGUMENTS 🎀

• mmio_info — contains list of MMIO regions. that's it, that's the list, she's holding the whole map 🗺️
• offset — register offset to find. you're like "hey where does this one live" and she goes and finds it 🔍
• num_args — number of additional arguments present. gotta tell her how many lil extras are coming 💫
• ... — optional BAR index (0 by default). so if you don't say anything, she just assumes 0, queen of low-effort defaults 👑

🦋 DESCRIPTION 🦋

This function finds the virtual address of a register offset by iterating through the non-linear MMIO regions that are mapped by the driver.

like literally, she walks through the non-linear MMIO regions — mapped by the driver — one by one, until she finds the virtual address for the register offset you asked about. it's giving "search party but make it elegant" 🧚

The list is traversed oldest to newest, so accessing an older mapping via this function while deleting a newer one is allowed. iykyk — that ordering is the whole point, and yes, you can absolutely read an old mapping while a newer one is being torn down. slay 💅

💀 RETURN 💀

valid MMIO virtual address or NULL.

that's it. you get an address, or you get NULL and you can cry about it 😭 (fr fr, check for the NULL, bestie.)

🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/ethernet/intel/libie/pci.c
• libie_find_mmio_region(9)
• __libie_pci_map_mmio_region(9)
• libie_pci_unmap_fltr_regs(9)
• libie_pci_unmap_all_mmio_regions(9)
• libie_pci_init_dev(9)

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and that's the page!! 🎀 source/version is ./drivers/net/ethernet/intel/l..., dated October 2026 — mwah, go read the other ones too, they're all in the same little family 👑💖