dm_test_enab...nd_and_fails(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

dm_test_enable_assr_initialized_builds_command_and_fails — okay so this is the KUnit test where the full body of the function actually runs, but the invoke gets bypassed. Bestie, it's giving "all dressed up, nowhere to call the firmware."

(this one's from the Kernel API Manual, section 9 — hi, that's us ✨)

🌸 SYNOPSIS 🌸

void dm_test_enable_assr_initialized_builds_command_and_fails (struct kunit *test );
Not me copying that spacing exactly — yes, there's a lil space before the );. It's canon. 🎀

🦋 ARGUMENTS 🦋

  • test — the KUnit test context, aka the whole entire vibe of the test. She's the main character; everything hangs off her. 👑

✨ DESCRIPTION ✨

Okay so picture this: the DTM TA is marked as initialized, and we've got a valid shared buffer in hand. With that setup, enable_assr goes ahead and runs its full body — like, no shortcuts, no early bail, the whole routine, periodt. 🔥

And what does that full body actually do? She:

  • acquires the DTM mutex 🔒
  • clears the shared command 🧹
  • fills in the ASSR-enable command from link 🛠️
  • pre-sets the status to GENERIC_FAILURE before invoking the TA 💀

Then comes the plot twist: psp_dtm_invoke is prevented from touching real firmware by marking the device as an SR-IOV virtual function — which makes it return early without modifying the shared status. No firmware touched, no status changed, iykyk. 🧚

So because the status stays GENERIC_FAILURE, enable_assr must return false. That's not a bug, bestie, that's the point. 🫶

And then the flex: inspecting the shared command afterwards proves that the body actually executed and consumed link. Like, evidence. Receipts. Slay. 💅

🌈 SEE ALSO 🌈

Kernel file: ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_hdcp_test.c

And now... the friend group. All 85 of them. No cap, I listed every single one. 🫡

And that's the whole thing, bestie 💖 — sourced straight from ./drivers/gpu/drm/amd/display/..., dated October 2026, and it's the dm_test_enable_assr_initialized_builds_command_and_fails(9) page, no cap. Go forth and run your tests. 🧚‍♀️✨🦋

📦 where this page comes from