msm: kgsl: Protect CP_STATE_DEBUG_INDEX.

Put CP_STATE_DEBUG_INDEX and CP_STATE_DEBUG_DATA under protection
to keep it from being written from an IB1. Doing so however opens
up a subtle "feature" in the microcode: memory read opcodes turn off
protected mode in the microcode to do the read and then turns it
back on regardless of the initial state. This is a problem if the
memory read happens while protected mode is turned off and then we
try to access a protected register which then complains and goes boom.

To account for this irregularity explicitly turn back off protected
mode in all the places where we know this will be a problem.

Change-Id: Ic0dedbad1397ca9b80132241ac006560a615e042
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
(cherry picked from commit 6775dbde263493bba95474ae826854e17eafe033)
msm: kgsl: Mark mmapped objects with VM_DONTCOPY.

Add VM_DONTCOPY to the default set of mmap flags to keep VM objects
from being copied on fork() and causing issues.  KGSL file descriptors
copied to a child are not expected to be usable.

Change-Id: Ic0dedbad85c07118a931ccb9f7a6fd0507da3e5a
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
(cherry picked from commit 82303f235e5fcd3349e059c06053ab4beef8b410)
msm: kgsl: Cleanup the memory free list.

Tighten up the memory free list code and remove the memory unused
debugfs file.  Outside of the cleanup the functional changes are
a) move the mutex to a spinlock for speed, and b) only return the
last entry in the list for given pid/gpu address combination.

Conflicts:
	drivers/gpu/msm/kgsl.c
	drivers/gpu/msm/kgsl.h
	drivers/gpu/msm/kgsl_debugfs.c

Change-Id: Ic0dedbad9595302e2b42de2807fa82c425d1717f
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
(cherry picked from commit 4b47c9eb5f0d9c6a7414279701c57b1fe3bfc14a)
msm: kgsl: hold a process_private refcount in process_mem_print

There is a possible race condition where the process can be going
away while its debugfs 'mem' file is being read, which could cause
memory corruption.

Conflicts:

	drivers/gpu/msm/kgsl.c

CRs-Fixed: 627780
Change-Id: I697486faeb3f186fd1220d0acc1e449a4f7b77b0
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>