Greetings,

I have attached 4 patches that implement the API i needed. I haven't send it officially as a patch

to the mailing list, since this is a POC and merely a request for review and "approval" of the approach

i have taken here. The patches are rebased on the latest TIP of coresight tree "next" branch(correct to the 

time of sending this message).

Basically, based on the patch i have uploaded, my use case is creating a single coresight session that uses an ETR sink,

and playing/pausing trace data generation on multiple CPUs simultaneously; And finally collecting trace data in the end:

session = coresight_etm_create_session()

buffer = coresight_etm_alloc_buffer()

coresight_etm_set_buffer(buffer)

coresight_etm_play()

...

...

...

coresight_etm_pause()

coresight_etm_free_buffer(buffer)

coresight_etm_destroy_session(session)