STRUCT DMUB_REGION(9)

✨ struct dmub_region(9) ✨

okay so bestie, welcome to the Kernel API Manual — yes that's the manual name, and yes we're reading it for fun now 🎀. Today's main character is struct dmub_region, aka the lil' struct that describes a dmub hw memory region. That's it. That's the whole vibe. It's giving "small but important" and honestly? Obsessed. 💅

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🌸 NAME 🌸

struct dmub_region — literally just the dmub hw memory region. no cap, that's the entire name section 🫶

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⭐ SYNOPSIS ⭐

here's the whole struct, bestie — only two members, we love a minimal queen 👑

struct dmub_region {
    uint32_t base;
    uint32_t top;
};

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🦋 Members 🦋

so there's exactly two fields and you're gonna wanna know both, fr fr:

• base — the base address for the region. ⚠️ heads up: it must be 256 byte aligned — like, this is not a suggestion, it's a requirement, don't come crying to me if you ignore it 😭
• top — the top address for the region. that's it, that's the vibe 🌈

bestie moment: base = where it starts, top = where it tops out. 256-byte alignment on base, or it's not slaying. periodt. 💀

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💖 SEE ALSO 💖

okay this is the part where the page goes absolutely feral and lists like every single DMUB thing in existence 💀 but we respect the hustle. Go read these, iykyk:

• the Kernel file ./drivers/gpu/drm/amd/display/dmub/dmub_srv.h — DMUB interface and operation(9) — start here honestly, it's the mothership 🧚
• struct dmub_window(9)
• struct dmub_fb(9)
• struct dmub_srv_region_params(9)
• struct dmub_srv_fw_meta_info_params(9)
• struct dmub_srv_region_info(9)
• struct dmub_srv_memory_params(9)
• struct dmub_srv_fb_info(9)
• struct dmub_soc_fb_info(9)
• struct dmub_diagnostic_data(9)
• struct dmub_preos_info(9)
• struct dmub_srv_base_funcs(9)
• struct dmub_srv_hw_funcs(9)
• struct dmub_srv_create_params(9)
• struct dmub_srv(9)
• struct dmub_notification(9)
• dmub_srv_create(9)
• dmub_srv_destroy(9)
• dmub_srv_calc_region_info(9)
• dmub_srv_has_hw_support(9)
• dmub_srv_is_hw_init(9)
• dmub_srv_hw_init(9)
• dmub_srv_hw_reset(9)
• dmub_srv_fb_cmd_queue(9)
• dmub_srv_fb_cmd_execute(9)
• dmub_srv_wait_for_hw_pwr_up(9)
• dmub_srv_wait_for_auto_load(9)
• dmub_srv_wait_for_phy_init(9)
• dmub_srv_wait_for_pending(9)
• dmub_srv_wait_for_idle(9)
• dmub_srv_send_gpint_command(9)
• dmub_srv_get_gpint_response(9)
• dmub_srv_get_gpint_dataout(9)
• dmub_srv_flush_buffer_mem(9)
• dmub_srv_get_fw_boot_status(9)
• dmub_srv_send_inbox0_cmd(9)
• dmub_srv_wait_for_inbox0_ack(9)
• dmub_srv_subvp_save_surf_addr(9)
• dmub_srv_set_power_state(9)
• dmub_srv_reg_cmd_execute(9)
• dmub_srv_cmd_get_response(9)
• dmub_srv_sync_inboxes(9)
• dmub_srv_wait_for_inbox_free(9)
• dmub_srv_update_inbox_status(9)
• dmub_srv_get_preos_info(9)
• dmub_srv_get_fw_meta_info_from_raw_fw(9)

no seriously, that's the whole list, i counted, and yes i am tired but we ate 🔥

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and that's the page, bestie!! 🎀✨ this lil' beauty lives over at ./drivers/gpu/drm/amd/display/..., dated October 2026, and it's filed under struct dmub_region(9) in the Kernel API Manual. go forth and align your base addresses to 256 bytes, ily, bye 💜🦋🌸