dm_test_dmub..._no_dmub_srv(9)

💅 dm_test_dmub_hw_resume_no_dmub_srv — Kernel API Manual ✨

okay so bestie, we're in the kernel API manual today, section 9, and the page is literally called dm_test_dmub..._no_dmub_srv(9) (yes the name is a whole vibe, they truncated it, we move on) 🫶

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🌸 NAME 🌸

dm_test_dmub_hw_resume_no_dmub_srv — the test that checks hw resume is a total no-op when DMUB isn't supported 💀

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✨ SYNOPSIS ✨

void dm_test_dmub_hw_resume_no_dmub_srv (struct kunit *test );

that's it, that's the whole signature, she's simple and she slays 🎀

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🦋 ARGUMENTS 🦋

• test — the KUnit test context, aka the little passport every KUnit test carries around. hand it over and you're good 💖

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🔥 DESCRIPTION 🔥

so picture this: adev->dm.dmub_srv is NULL — like, the DMUB service is not there, absent, ghosted, no note, nothing 🙈

when that happens, dm_dmub_hw_resume is supposed to return early. just dip. leave. no dereferencing the (absent) DMUB service, because dereferencing a NULL pointer is giving main character energy in the worst possible way and the kernel does NOT need that 😭

this test is the vibe check: does it bail out cleanly before touching the thing that isn't there? yes? iconic, test passes 👑

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⭐ SEE ALSO ⭐

Kernel file 📁

./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_dmub_test.c

and like, the entire extended friend group of sibling tests (they all live together, it's giving group chat) 💜

• dm_test_register_dmub_notify_callback_null_callback(9)
• dm_test_register_dmub_notify_callback_type_out_of_range(9)
• dm_test_register_dmub_notify_callback_valid(9)
• dm_test_register_dmub_notify_callback_offload_false(9)
• dm_test_dmub_aux_setconfig_callback_copies_and_completes(9)
• dm_test_dmub_aux_setconfig_callback_non_aux_no_complete(9)
• dm_test_dmub_aux_setconfig_callback_aux_with_null_dm_notify(9)
• dm_test_dmub_aux_setconfig_callback_set_config_reply(9)
• dm_test_dmub_aux_fused_io_callback_copies_reply_and_completes(9)
• dm_test_dmub_aux_fused_io_callback_max_ddc_line(9)
• dm_test_dmub_aux_fused_io_callback_null_args(9)
• dm_test_get_default_ips_mode_dcn35(9)
• dm_test_get_default_ips_mode_dcn351(9)
• dm_test_get_default_ips_mode_dcn36(9)
• dm_test_get_default_ips_mode_older_than_dcn35(9)
• dm_test_get_default_ips_mode_newer_default(9)
• dm_test_dmub_hw_init_no_dmub_srv(9)
• dm_test_dmub_hw_init_no_fb_info(9)
• dm_test_dmub_hw_init_no_firmware(9)
• dm_test_dmub_hw_init_success_fake_dmub(9)
• dm_test_dmub_hw_init_no_hw_support(9)
• dm_test_dmub_hw_init_bss_data(9)
• dm_test_dmub_hw_init_hw_init_fails(9)
• dm_test_dmub_hw_init_auto_load_timeout(9)
• dm_test_dmub_hw_init_apu_dpia_dcn35(9)
• dm_test_dmub_hw_init_sanity_checks_dcn31(9)
• dm_test_dmub_hw_init_sanity_checks_dcn314(9)
• dm_test_dmub_hw_init_dmcu_abm(9)
• dm_test_dmub_hw_resume_initialized_dmub(9)
• dm_test_dmub_hw_resume_full_init(9)
• dm_test_dmub_hw_resume_init_check_failed(9)
• dm_test_dmub_hw_resume_auto_load_timeout(9)
• dm_test_dmub_sw_init_unsupported_asic(9)
• dm_test_init_microcode_unsupported_asic(9)
• dm_test_dmub_get_vbios_bounding_box_default_null(9)
• dm_test_execute_dmub_cmd_null_dmub_srv(9)
• dm_test_process_dmub_aux_transfer_sync_engine_acquire(9)
• dm_test_process_dmub_aux_transfer_sync_protocol_error(9)
• dm_test_process_dmub_aux_transfer_sync_copies_data(9)
• dm_test_process_dmub_aux_transfer_sync_zero_length(9)
• dm_test_process_dmub_set_config_sync_unknown_error(9)
• dm_test_abort_fused_io_no_dmub_srv(9)

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that's the whole page, no cap ✨ this one came out of ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — yes, the future, she's ahead of her time 💅 see you in the next manpage bestie, mwah 🎀💖