misc: uidstat: avoid create_stat() race and blockage.

* create_stat() race would lead to:
  [   58.132324] proc_dir_entry 'uid_stat/10061' already registered

* blocking kmalloc reported by sbranden
 tcp_read_sock()
  uid_stat_tcp_rcv()
    create_stat()
      kmalloc(GFP_KERNEL)

Signed-off-by: JP Abgrall <jpa@google.com>
cpufreq: interactive: handle errors from cpufreq_frequency_table_target

Add checks for error return from cpufreq_frequency_table_target, and be
less noisy on the existing call with an error check.  CPU hotplug and
system shutdown may cause this call to return -EINVAL.

Bug: 8613560
Change-Id: Id78d8829920462c0db1c7e14e717d91740d6cb44
Signed-off-by: Todd Poynor <toddpoynor@google.com>
cpufreq: interactive: reduce chance of zero time delta on load eval

Reschedule load sampling timer after timestamp of sample start taken,
hold spinlock across entire sequence to avoid preemption.  Avoid the
WARN for zero time delta in the load sampling timer function.

Change-Id: Idc10a756f09141decb6df92669521a1ebf0dbc10
Signed-off-by: Todd Poynor <toddpoynor@google.com>
cpufreq: interactive: avoid underflow on active time calculation

Check for idle time delta less than elapsed time delta, avoid
underflow computing active time.

Change-Id: I3e4c6ef1ad794eec49ed379c0c50fa727fd6ad28
Signed-off-by: Minsung Kim <ms925.kim@samsung.com>
[ARM] msm: iommu_domains: replace vmalloc with kmalloc

There is no point using vmalloc for small temporary allocations.  kmalloc will
allocate more quickly and will not fragment the vmalloc space.

Signed-off-by: Iliyan Malchev <malchev@google.com>
msm: Export some iommu domain management functions

Several of the iommu virtual address space functions may
need to be accessed by modules. Export the symbol.

Change-Id: Ief99cbb63f729943b6d8b45ce9aed071d84decd1
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
(cherry picked from commit 33b30bee472264ecf5b7d06d842349bbe593d0fc)

Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>
(cherry picked from commit 67c19b8a6c2a8a4e27df324516ecddbf758c379c)
msm: Fix race condition in domain lookup

During lookup of domains we take a pointer to the root node
of the rb tree before taking the mutex to protect the rb tree.
However, the rb root node might change if another process updates
the rb tree after we take the pointer to the root node. This can
cause us to not find the entry that we are looking for.
Fix this by ensuring we have taken the mutex before getting the
root node pointer.

CRs-fixed: 493503
Change-Id: I4702740e486fda0cd92df0401d8e4706598a899b
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
msm: kgsl: Fix the address translation ranges for GPU IOMMU

Set the address translation to happen via ttbr0 for GPU IOMMU till
address 0x80000000 instead of 0x40000000. Also, adjust the size of
virtual pool so that it does not allocate an address greater
than 0x80000000.

CRs-fixed: 401364
Change-Id: I268dda47e82e80a7ee0a72a835c7777be8b6f7f5
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>
msm: kgsl: Add context reference counting to KGSL events

Add reference counting to all KGSL events since they are dependent
on the context.  This avoids a race condition where the context
could be destroyed while the events are being processed during cleanup.

CRs-fixed: 438134
Change-Id: Ic2cd484d441e4c392ab63b0a0131accaceafc711
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>
msm: kgsl: Always resume the GPU regardless of its state

Make sure we resume the GPU regardless of its current
state. If the device is not in suspend state restart the
device and  print an error message.

Change-Id: I9e71cbe27d360dc06513c54f3a734aaea5b10d2b
Signed-off-by: Suman Tatiraju <sumant@codeaurora.org>
msm: kgsl: Set the gpu address range for MMU to correct value

Set the upper limit for the gpu address that the MMU can access to
be the base address where the first IOMMU units register space
is mapped. Earlier we set it to the last address mapped minus
a PAGE_SIZE, but we can actually set it to the base address of the
first mapped unit since the GPU should never access that space
unless we are updating IOMMU registers.

Change-Id: I6507ee373a9218210c148685e443e948a311bd29
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>
msm: kgsl: Handle missed alloc error cases

There is a chance that we could fail to allocate memory and then write
to it when allocating entries for our scatter gather list.  Handle the
error cases properly to prevent writing to NULL.

Change-Id: I33978ff53114ede7007b3240406583bcbef2f292
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>
Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>
msm: kgsl: Return error if the user allocates a buffer size of zero

Instead of calling BUG_ON if the user passes a zero length via
IOCTL_KGSL_GPUMEM_ALLOC to kgsl_sharedmem_alloc_user, return
-EINVAL instead and propegate the error back up to the user.

CRs-fixed: 389886
Change-Id: Ic0dedbad2dc1f68ad1d3227498893c73c2a1c59e
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>
msm: kgsl: Limit GPU memory buffer allocation sizes

Limit the size of individual GPU memory allocations to the amount of
free memory on the system minus 32MB.  This early check gives us the
chance to verify that the user didn't ask for an obscene amount of
memory, and also to limit the chance that an allocation attempt will
invoke the OOM killer.

The 32MB buffer in particular should keep us out of the clutches of
the OOM killer. That number is the same amount of buffer used in
the page allocation alogrithms and it should keep the GPU from further
throwing fuel on the fire of a low memory situation.

Change-Id: Ic0dedbadcc5ee9cc0d77056b1a22eed5c385d636
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>
msm: kgsl: Enable "big page" memory allocations

Allow users to specify "big page" mode when allocating GPU
memory. This will attempt to allocate contigious units of 64k
bytes per instead of the usual PAGE_SIZE units.  If the allocation
fails, then automatically fall back to allocate the rest of the
region with 4K pages. This means that potentially any allocation
could be comprised of a mixture of 64k chunks and 4k chunks.

Change-Id: Ib92c0c099d3b10ba54dbb864c5f977f8df4912f2
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
Signed-off-by: Rajeev Kulkarni <krajeev@codeaurora.org>

Conflicts:
	drivers/gpu/msm/kgsl_sharedmem.c
Merge pull request #24 from razrqcom-dev-team/cm-10.1

Cm 10.1