dmub_srv_flush_buffer_mem(9)

💅 dmub_srv_flush_buffer_mem — the Kernel API Manual tea 🫶

okay so bestie, welcome to dmub_srv_flush_buffer_mem(9), a kernel API manual page, and no cap it's a little baddie with a big job. Let's get into it ✨

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🌸 NAME 🌸

dmub_srv_flush_buffer_mem — read back the entire frame buffer region. the whole thing. and why, you ask? because this is literally what ensures the write from x86 has been flushed and will not hang the DMCUB. that's the vibe check that keeps everything from going 💀, fr fr.

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🎀 SYNOPSIS 🎀

void dmub_srv_flush_buffer_mem (struct dmub_srv *dmub , const struct
       dmub_fb *fb );

that's it, that's the signature, she's iconic and she returns void (no tea, no receipts, just vibes) 💅

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🦋 ARGUMENTS 🦋

• dmub — the dmub service ✨ like, the main character herself
• fb — frame buffer to flush 🧚 this is the one getting the read-back treatment

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🌈 DESCRIPTION 🌈

You can call her after software initialization. that's the window, that's the moment, and when you hit it she reads back the entire frame buffer region so the x86 write is actually flushed and the DMCUB does not hang. lowkey essential, highkey underrated 👑

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⭐ SEE ALSO ⭐

okay this list is LONG and honestly it's giving "linked in bio" energy, but every single one matters so we're listing every single one, periodt 🔥

• Kernel file ./drivers/gpu/drm/amd/display/dmub/dmub_srv.h DMUB interface and operation(9)
• struct dmub_region(9)
• 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_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)

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bestie reminder 💖: the whole point of this function is the read-back. skip it and the x86 write might not be flushed, and then the DMCUB hangs. we do not want that energy, okay? 🙈

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and that's the page!! brought to you from ./drivers/gpu/drm/amd/display/..., dated October 2026 — mwah, slay, go flush those buffers responsibly 🍓💜🌸