STRUCT PCI_EPC_MEM(9)

💖 NAME 💖

okay bestie, welcome to the Kernel API Manual — this one's struct pci_epc_mem, which is literally the address space of the endpoint controller. that's the whole vibe. ✨

🦋 SYNOPSIS 🦋

struct pci_epc_mem {
    struct pci_epc_mem_window window;
    unsigned long   *bitmap;
    int pages;
    struct mutex    lock;
 };

like look at her. four fields. flawless. 💅

🎀 Members 🎀

• window — the address window of the endpoint controller. that's her whole territory, her little kingdom, no cap 👑
• bitmap — a bitmap whose entire job is managing the PCI address space. she's the one keeping track of what's taken and what's free, main character energy fr 🌸
• pages — the number of bits representing the address region. yes queen, count them bits 🧚
• lock — a mutex protecting the bitmap. because two threads touching the bitmap at once is not the vibes, and this lock said "not on my watch" 💀🔒

🔥 SEE ALSO 🔥

Kernel file ./include/linux/pci-epc.h — and the whole friend group:

• struct pci_epc_map(9)
• enum pci_epc_aux_resource_type(9)
• struct pci_epc_aux_resource(9)
• struct pci_epc_ops(9)
• struct pci_epc_mem_window(9)
• struct pci_epc(9)
• enum pci_epc_bar_type(9)
• enum pci_epc_bar_rsvd_region_type(9)
• struct pci_epc_bar_rsvd_region(9)
• struct pci_epc_bar_desc(9)
• struct pci_epc_features(9)

ngl the whole squad is linked above, go read them, iykyk 🫶

mwah 💖 that's a wrap — sourced fresh from ./include/linux, brought to you by the Kernel API Manual, dated October 2026. periodt. 🎀✨