dm_test_srm...ta_keeps_srm(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

dm_test_srm_data_write_uninitialized_ta_keeps_srm — bestie, this is the test that does a write while the TA is literally not initialized 🫶 like we're checking that nothing gets committed when the setup isn't ready, iykyk

✨ SYNOPSIS ✨

void dm_test_srm_data_write_uninitialized_ta_keeps_srm (struct kunit
*test );

🎀 ARGUMENTS 🎀

  • test — the KUnit test context, aka the lil' main character handing us everything we need for this run 🌸

🦋 DESCRIPTION 🦋

Okay so here's the tea ☕: srm_data_write always copies the incoming buffer into work->srm_temp and returns the byte count. That's just what it does, no cap.

But when the HDCP TA is not initialized, psp_set_srm fails — and because of that, the committed SRM (work->srm / work->srm_size) must stay completely untouched. Not one byte moved. Periodt. 💀

So the whole vibe of this test is: temp buffer gets the data, the commit does not happen, and the real SRM stays exactly as it was. Iconic behavior honestly 🔥

👑 SEE ALSO 👑

✿ and that's the whole page, bestie ✿ this one lives at ./drivers/gpu/drm/amd/display/... (Kernel API Manual, October 2026, dm_test_srm...ta_keeps_srm(9)) — go forth and keep that SRM untouched, mwah 💖🎀🦋

📦 where this page comes from