STRUCT XILINX_PCIE(9)

💖 struct xilinx_pcie — PCIe port information 💖

Okay bestie, so this is from the Kernel API Manual and it's literally the glow-up of PCIe port info for Xilinx, no cap. Let me walk you through it like we're studying together at 2am with iced coffee 🧊☕

✨ SYNOPSIS ✨

Here's the whole struct, laid out exactly as-is. Don't touch, just vibe:

struct xilinx_pcie {
    struct device *dev;
    void __iomem *reg_base;
    unsigned long msi_map[BITS_TO_LONGS(XILINX_NUM_MSI_IRQS)];
    struct mutex map_lock;
    struct irq_domain *msi_domain;
    struct irq_domain *leg_domain;
    struct list_head resources;
 };

🎀 Members (the main characters) 🎀

• dev — Device pointer. This is the device's whole identity, its main character energy 💅
• reg_base — IO Mapped Register Base. Where the registers live, mapped into memory fr.
• msi_map — Bitmap of allocated MSIs. A literal bitmap tracking which MSIs are taken 🔥
• map_lock — Mutex protecting the MSI allocation. Bestie this is the lock that keeps things from getting messy — if two people grab the MSI map at once it's giving chaos, and this mutex says not today 🙈
• msi_domain — MSI IRQ domain pointer. Points at the MSI interrupt domain, periodt.
• leg_domain — Legacy IRQ domain pointer. Same vibe but for legacy IRQs, iconic.
• resources — Bus Resources. Holds all the bus resource info, like the struct's little tote bag of stuff 👜

🔍 SEE ALSO 🔍

• Kernel file ./drivers/pci/controller/pcie-xilinx.c
• xilinx_pcie_clear_err_interrupts(9)
• xilinx_pcie_valid_device(9)
• xilinx_pcie_map_bus(9)
• xilinx_pcie_intx_map(9)
• xilinx_pcie_intr_handler(9)
• xilinx_pcie_init_irq_domain(9)
• xilinx_pcie_init_port(9)
• xilinx_pcie_parse_dt(9)
• xilinx_pcie_probe(9)

All of these are in ./drivers/pci/controller, iykyk 🦋

Okay so like, if you're messing with the MSI map without holding map_lock, bestie I'm gonna need you to stop. That's the whole reason the mutex is there. It's protecting the allocation, fr fr 🫶

That's the whole thing, no skips, no cuts, every detail retained 👑 Slay.

October 2026 · ./drivers/pci/controller · struct xilinx_pcie(9) — and that's the official sign-off, mwah 💋🌈