STRUCT IOSM_PCIE(9)

💅 struct iosm_pcie(9) — the Kernel API Manual, but make it cute

okay bestie, welcome to the struct iosm_pcie(9) page from the Kernel API Manual 💖 this is the IPC_PCIE struct, and it's basically the main character of the iosm WWAN driver's PCIe era. let's get into it ✨

---

🌸 NAME 🌸

struct iosm_pcie — the IPC_PCIE struct. that's it, that's the whole vibe 🫶

---

🎀 SYNOPSIS 🎀

here she is, in all her glory — every field, exactly as declared, no cap:

struct iosm_pcie {
    struct pci_dev *pci;
    struct device *dev;
    void __iomem *ipc_regs;
    void __iomem *scratchpad;
    struct iosm_imem *imem;
    int ipc_regs_bar_nr;
    int scratchpad_bar_nr;
    int nvec;
    u32 doorbell_reg_offset;
    u32 doorbell_write;
    u32 doorbell_capture;
    unsigned long suspend;
    enum ipc_pcie_sleep_state d3l2_support;
 };

---

🦋 Members 🦋

okay so now we go field by field, and honestly? every one of them is serving a purpose 🔥

• pci — address of the device description 💫
• dev — pointer to the generic device structure 🎀
• ipc_regs — the remapped CP doorbell address of the irq register set, and its whole job is to fire the doorbell irq 🔔 literally what she was born to do
• scratchpad — the remapped CP scratchpad address, used to send the configuration tuple and the IPC descriptors to CP in the ROM phase 🌈 heads up: the config tuple information gets saved on the MSI scratchpad ✨
• imem — pointer to the imem data struct 💜
• ipc_regs_bar_nr — the BAR number to be used for the IPC doorbell 🌸
• scratchpad_bar_nr — the BAR number to be used for Scratchpad 🦋
• nvec — the number of requested irq vectors ⭐
• doorbell_reg_offset — doorbell_reg_offset 😭 (yes, that's genuinely the description, she said "I am what I am")
• doorbell_write — the doorbell write register ✍️
• doorbell_capture — the doorbell capture resgister 📸
• suspend — S2IDLE sleep/active 😴
• d3l2_support — reads the WWAN RTD3 BIOS setting for D3L2 support 👑

---

💀 SEE ALSO 💀

go read these next, bestie, they're all linked up 🫶 the kernel file is ./drivers/net/wwan/iosm/iosm_ipc_pcie.h (and the enum lives there too):

• enum ipc_pcie_sleep_state(9)
• struct ipc_skb_cb(9)
• enum ipc_ul_usr_op(9)
• ipc_pcie_addr_map(9)
• ipc_pcie_addr_unmap(9)
• ipc_pcie_alloc_skb(9)
• ipc_pcie_alloc_local_skb(9)
• ipc_pcie_kfree_skb(9)
• ipc_pcie_check_data_link_active(9)
• ipc_pcie_suspend(9)
• ipc_pcie_resume(9)
• ipc_pcie_check_aspm_enabled(9)
• ipc_pcie_config_aspm(9)

---

ngl the whole thing lives under ./drivers/net/wwan/iosm and that's the path you'll see stamped on the page 🧚

and that's the tea 🍓 this page dropped October 2026, courtesy of the kernel's very own ./drivers/net/wwan/iosm directory — slay, iconic, no notes 💅💖✨