STRUCT TB_NVM(9)

✨ struct tb_nvm(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this page is literally all about struct tb_nvm, and it’s giving “NVM info holder with main character energy.” let’s get into it, no cap.

🌸 NAME 🌸

struct tb_nvm - Structure holding NVM information 🎀

🌈 SYNOPSIS 🌈

here’s the whole struct, character for character, periodt:

struct tb_nvm {
    struct device *dev;
    u32 major;
    u32 minor;
    int id;
    struct nvmem_device *active;
    size_t active_size;
    struct nvmem_device *non_active;
    void *buf;
    void *buf_data_start;
    size_t buf_data_size;
    bool authenticating;
    bool flushed;
    const struct tb_nvm_vendor_ops *vops;
};

👑 Members 👑

okay, member-by-member vibe check, bestie:

• dev — Owner of the NVM 🔑
• major — Major version number of the active NVM portion
• minor — Minor version number of the active NVM portion
• id — Identifier used with both NVM portions — one id, two portions, iconic
• active — Active portion NVMem device ✨
• active_size — Size in bytes of the active NVM
• non_active — Non-active portion NVMem device 🦋
• buf — Buffer where the NVM image is stored before it is written to the actual NVM flash device
• buf_data_start — Where the actual image starts after skipping possible headers
• buf_data_size — Number of bytes actually consumed by the new NVM image
• authenticating — The device is authenticating the new NVM
• flushed — The image has been flushed to the storage area
• vops — Router vendor specific NVM operations (optional)

💫 Description 💫

⚠️ important bestie: the user of this structure needs to handle serialization of possible concurrent access. that’s the whole note, fr fr — no cap, it’s on the user of this structure.

🦋 SEE ALSO 🦋

the reference rabbit hole starts at Kernel file ./drivers/thunderbolt/tb.h, and includes the whole squad:

• enum tb_switch_tmu_mode(9)
• struct tb_switch_tmu(9)
• struct tb_switch(9)
• struct tb_bandwidth_group(9)
• struct tb_port(9)
• struct usb4_port(9)
• struct tb_retimer(9)
• struct tb_path_hop(9)
• enum tb_path_port(9)
• struct tb_path(9)
• struct tb_cm_ops(9)
• tb_upstream_port(9)
• tb_is_upstream_port(9)
• tb_port_has_remote(9)
• tb_domain_event(9)
• tb_switch_for_each_port(9)
• tb_switch_downstream_port(9)
• tb_switch_depth(9)
• tb_switch_is_icm(9)
• tb_switch_tmu_is_configured(9)
• tb_switch_tmu_is_enabled(9)
• tb_switch_clx_is_enabled(9)
• tb_port_path_direction_downstream(9)
• tb_for_each_port_on_path(9)
• tb_for_each_upstream_port_on_path(9)
• tb_path_for_each_hop(9)
• tb_downstream_route(9)
• tb_xdomain_downstream_port(9)
• usb4_switch_version(9)
• tb_switch_is_usb4(9)
• enum usb4_sb_target(9)
• enum usb4_margin_sw_error_counter(9)
• struct usb4_port_margining_params(9)

okay bye bestie! 💜 source/version: ./drivers/thunderbolt; date: October 2026; footer energy: struct tb_nvm(9). mwah 🎀