msm: kgsl: Add event tracepoints

Add tracepoints for tracking the lifespan of GPU events.

Change-Id: Ic0dedbadf99b1efcb650608c6ac664d3c4ddafd5
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
msm: kgsl: Delete the context event while the context is still valid

Make sure that the context is freed only after the event is deleted
from the list to avoid accessing invalid list pointers. This makes
sure that the context memory is not accessed after being freed.

Change-Id: I9196219f1472396c0063dbeaa5351f66e6e5648f
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>
Signed-off-by: Uma Maheshwari Bhiram <ubhira@codeaurora.org>
msm: kgsl: Don't access context memory after it's freed

Context memory was potentially accessed after being freed. Fix this
by incrementing the context's refcount at strategic places.

Change-Id: I31049bdd3eb9ac52160ca593619fcc8a32d4ddee
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>
msm: kgsl: Add NULL check for next_event hook

KGSL driver needs to check that the function pointer
is not NULL before calling the hook. next_event
is an optional function not implemented by the 2d
core. This fix ensures that optional and unimplemented
function will not invoked by the driver.

Change-Id: I687b028260e3ec304d973c6a5bded0a8fdbfb73b
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
msm: kgsl: Remove additional idle commands

Remove unneeded idle commands from the command stream when updating
pagetables and doing TLB flushes.  Ths cuts down on the number of
commands in the ringbuffer during switches.

Change-Id: Ic0dedbad7a0d64c39518b2dd2bb6322f4ab74ba0
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>

Conflicts:
	drivers/gpu/msm/adreno.c