STRUCT PCI_EPC_MAP(9)

💖 struct pci_epc_map(9) 💖

okay bestie, welcome to the Kernel API Manual — this page is all about struct pci_epc_map(9), and it's literally giving “here's the info you need about EPC memory for mapping a RC PCI address range.” slay. 💅

🌸 NAME 🌸

struct pci_epc_map — literally the information about EPC memory for mapping a RC PCI address range. that's the whole vibe. ✨

✨ SYNOPSIS ✨

here's the struct in all its glory, no cap:

struct pci_epc_map {
    u64 pci_addr;
    size_t pci_size;
    u64 map_pci_addr;
    size_t map_size;
    phys_addr_t phys_base;
    phys_addr_t phys_addr;
    void __iomem    *virt_base;
    void __iomem    *virt_addr;
 };

💅 Members 💅

• pci_addr — the start address of the RC PCI address range you're mapping. periodt.
• pci_size — the size of the RC PCI address range mapped from pci_addr.
• map_pci_addr — the RC PCI address used as the first address mapped. lowkey it may be lower than pci_addr.
• map_size — the size of the controller memory needed for mapping the RC PCI address range map_pci_addr..pci_addr+pci_size.
• phys_base — the base physical address of the allocated EPC memory for mapping the RC PCI address range.
• phys_addr — the physical address at which pci_addr is mapped.
• virt_base — the base virtual address of the allocated EPC memory for mapping the RC PCI address range.
• virt_addr — the virtual address at which pci_addr is mapped.

🦋 SEE ALSO 🦋

Kernel file ./include/linux/pci-epc.h is the main character, and the whole friend group is:

• 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_mem(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)

that's the tea ☕ this page comes from ./include/linux, dated October 2026, and it's all about struct pci_epc_map(9) — bye bestie! 🫶💖