Linus doesn't like our bag of acronyms. [1]
I think TSM may have originated in the kernel community.. possibly by way of intel docs.
Device Security Manager (DSM) may also be coming down the pike as part of TEE-IO. That may collide with pre-existing uses of 'DSM' in Linux.[2]
[1] https://lore.kernel.org/linux-coco/CAHk-=whjvmBiZ=oMnR-R9rqzEPnGCaU7dNLkY1RHXwjRCAR5YQ@mail.gmail.com/
[2]
linux/Documentation
$ grep -Rl DSM | wc
24 24 754