dm_test_perf...estamp_basic(9)

💅 dm_test_perf_trace_timestamp_basic — the Kernel API Manual, bestie edition ✨

okay so real talk, we're deep in the Kernel API Manual today and the star of the show is dm_test_perf_trace_timestamp_basic(9). she's a KUnit test, she's lowkey iconic, and she has one (1) job: prove that a thing doesn't explode. let's get into it 🫶

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✨ NAME ✨

dm_test_perf_trace_timestamp_basic — Test Perf trace timestamp basic. that's literally the whole vibe. no cap. 🎀

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🦋 SYNOPSIS 🦋

void dm_test_perf_trace_timestamp_basic (struct kunit *test );

that's it. that's the signature. void, no return, in and out, periodt. 💅

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🌸 ARGUMENTS 🌸

• test — the KUnit test context 🧚 that's her little backstage pass, she needs it to know which test she's currently slaying.

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💖 DESCRIPTION 💖

okay so here's the tea ☕ — a tracepoint with no attached probe is a total no-op. it literally does nothing, it's giving "ghosted by the probe." 👻

so this test is here to check that the function dereferences ctx->perf_trace safely and does not crash. that's the whole assignment. no crash = ate. 🔥 if it crashes, well… 😭 we don't talk about that.

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👑 SEE ALSO 👑

Kernel file — go read the source, iykyk:

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

and now, the whole friend group of sibling tests, gathered for the group chat 🌈:

• dm_test_get_elapse_time_zero_delta(9)
• dm_test_get_elapse_time_positive_delta(9)
• dm_test_get_elapse_time_large_delta(9)
• dm_test_get_elapse_time_wraparound(9)
• dm_test_trace_smu_enter_null_ctx(9)
• dm_test_trace_smu_enter_with_params(9)
• dm_test_trace_smu_exit_success_null_ctx(9)
• dm_test_trace_smu_exit_failure_null_ctx(9)
• dm_test_trace_smu_exit_with_response(9)
• dm_test_query_brightness_caps_null_ctx(9)
• dm_test_query_brightness_caps_null_caps(9)
• dm_test_query_brightness_caps_null_driver_ctx(9)
• dm_test_query_brightness_caps_lcd2_null_ctx(9)
• dm_test_query_brightness_caps_lcd1_success(9)
• dm_test_query_brightness_caps_non_lcd1_uses_second_slot(9)

like, the way that list just keeps going?? main character energy from every single one of them honestly 💜

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okay that's the whole page bestie, no filler, every single detail intact 🍓 go forth and crash nothing ✨

kisses, and remember — this page came to you from ./drivers/gpu/drm/amd/display/... with October 2026 as the date, and it's all about dm_test_perf...estamp_basic(9) forever and always 💅💖