msm: lpm_levels: remove rpm handshake in l2_gdhs mode

Remove rpm handshake in l2_gdhs mode and adjust the
latency values for l2_gdhs mode. Add a new dt entry to
inform lpm_levels driver to send sleep votes to rpm.

CRs-fixed: 604873
Change-Id: I9eeae5fada4f84ee2ca2eb9d67707dee1adf56ac
Signed-off-by: Anil kumar mamidala <amami@codeaurora.org>
msm: lpm_levels: return new idle level to cpuidle framework

Need to return the new idle level to cpuidle framework
but just returned input value argument 'index' which is
not used actually at lpm_cpu_power_select().

CRs-fixed: 601636
Change-Id: Iabd182eeb4fbdc67f4e07b40a1b593471cf8cbdf
Signed-off-by: Anil kumar mamidala <amami@codeaurora.org>
msm: lpm_levels: fix driver compilation issue

Assigning an unsinged long value to unsinged int is not
correct and it cause driver compilation failure. Fix by
assigning a proper value.

Change-Id: Ia8d214425c3ba07006e748bc74365da6bc22f224
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>
msm: lpm: remove redundant assignment

Removed the redundant cpu level is assignment.

Change-Id: I1aecc4f3d1eb55cd9e057c82f63b8f145401c0fc
Signed-off-by: Venkat Devarasetty <vdevaras@codeaurora.org>
msm: lpm_levels: fix incorrect mode select with next event time

Based on the next event timer value the best power mode will get
selected but there is a mismatch in calculation of selecting
the best mode. This change will fix that and selects the correct
mode based on the next wakeup time.

CRs-fixed: 611794
Change-Id: I31270e62b04e7a97afa1c9b0c45069ad82d1a9b0
Signed-off-by: Anil kumar mamidala <amami@codeaurora.org>
msm: lpm_levels: Fix incorrect computation of next wakeup time

The next event timer wakeup was incorrectly computed when the hard timer
event doesn't exist. Fix by ensuring the next wakeup is computed only
when a timer event is valid

Change-Id: I40c1f372f84d8f43b2101e37dcfb592193d4b2e0
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
msm: pm: print active clocks before entering into pc

print out all active clocks during idle power collapse
and suspend power collapse using clock debug API

CRs-fixed: 596828
Change-Id: Ie653c02d490b80de001f61fe8320ee851bb139c7
Signed-off-by: Anil kumar mamidala <amami@codeaurora.org>
msm: pm: bug in pc debug counters logic

The logic to find the location to add debug counter
for a CPU is incorrect and due to this the counter
of next CPU is corrupted. The logic is updated to
correct this.

CRs-fixed: 596773
Change-Id: I6de21bd480720d80ad9801d8a1331b6faf689b95
Signed-off-by: Anil kumar mamidala <amami@codeaurora.org>
msm: lpm_levels: update suspend stats counters and time

suspend stats in the debug pm stats are not getting updated as
suspend stats in the suspend wake path is missing. This change
will add and update the suspend stats in the suspend wake path.

CRs-fixed: 536881
Change-Id: I3b47511afb75926e51e82fc83929f405404fbf07
Signed-off-by: Anil kumar mamidala <amami@codeaurora.org>

Conflicts:
	arch/arm/mach-msm/msm-pm.c
lpm_levels: Do not allow power collapse when multi cores online

When any core power collapse is not selected, no need to allow
idle power collapse on cpu0 when multi cores online. It may leads to
stability issues.

CRs-fixed: 651076
Change-Id: I4c4eb4fb7d40e8bda78fa61358bcb0b00c4f6787
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>
smp: Add generic smpboot facility

Start a new file, which will hold SMP and CPU hotplug related generic
infrastructure.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Howells <dhowells@redhat.com>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/20120420124557.035417523@linutronix.de

Change-Id: Ia1ad435435aa12c47ac0d381ae031ebf6edcff1f
smp: Provide generic idle thread allocation

All SMP architectures have magic to fork the idle task and to store it
for reusage when cpu hotplug is enabled. Provide a generic
infrastructure for it.

Create/reinit the idle thread for the cpu which is brought up in the
generic code and hand the thread pointer to the architecture code via
__cpu_up().

Note, that fork_idle() is called via a workqueue, because this
guarantees that the idle thread does not get a reference to a user
space VM. This can happen when the boot process did not bring up all
possible cpus and a later cpu_up() is initiated via the sysfs
interface. In that case fork_idle() would be called in the context of
the user space task and take a reference on the user space VM.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Howells <dhowells@redhat.com>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: x86@kernel.org
Acked-by: Venkatesh Pallipadi <venki@google.com>
Link: http://lkml.kernel.org/r/20120420124557.102478630@linutronix.de

Change-Id: Ie2d32789f3a69ee15f38ba704aaa84d6be85bcd4
smp, idle: Allocate idle thread for each possible cpu during boot

percpu areas are already allocated during boot for each possible cpu.
percpu idle threads can be considered as an extension of the percpu areas,
and allocate them for each possible cpu during boot.

This will eliminate the need for workqueue based idle thread allocation.
In future we can move the idle thread area into the percpu area too.

[ tglx: Moved the loop into smpboot.c and added an error check when
  the init code failed to allocate an idle thread for a cpu which
  should be onlined ]

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: venki@google.com
Link: http://lkml.kernel.org/r/1334966930.28674.245.camel@sbsiddha-desk.sc.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Change-Id: I36828165fc08b7c0a8a0fe6a2aa24d358e623dd2

Conflicts:
	kernel/smp.c
smpboot, idle: Optimize calls to smp_processor_id() in idle_threads_init()

While trying to initialize idle threads for all cpus, idle_threads_init()
calls smp_processor_id() in a loop, which is unnecessary. The intent
is to initialize idle threads for all non-boot cpus. So just use a variable
to note the boot cpu and use it in the loop.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: suresh.b.siddha@intel.com
Cc: venki@google.com
Cc: nikunj@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/20120524151055.2549.64309.stgit@srivatsabhat.in.ibm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Change-Id: Ib65df4c31e93e1622c26f2c2a4946ffd28c1839d
smpboot, idle: Fix comment mismatch over idle_threads_init()

The comment over idle_threads_init() really talks about the functionality
of idle_init(). Move that comment to idle_init(), and add a suitable
comment over idle_threads_init().

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: suresh.b.siddha@intel.com
Cc: venki@google.com
Cc: nikunj@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/20120524151100.2549.66501.stgit@srivatsabhat.in.ibm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Change-Id: Ib0cd6d6e19e0c64868a42a77101b080a5f3b04f8
kthread: add back comments
kthread_worker: reorganize to prepare for flush_kthread_work() reimplementation

Make the following two non-functional changes.

* Separate out insert_kthread_work() from queue_kthread_work().

* Relocate struct kthread_flush_work and kthread_flush_work_fn()
  definitions above flush_kthread_work().

v2: Added lockdep_assert_held() in insert_kthread_work() as suggested
    by Andy Walls.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Andy Walls <awalls@md.metrocast.net>

Change-Id: Ie1eef2c000c328ec16f32db011377415237da93d
kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed

kthread_worker provides minimalistic workqueue-like interface for
users which need a dedicated worker thread (e.g. for realtime
priority).  It has basic queue, flush_work, flush_worker operations
which mostly match the workqueue counterparts; however, due to the way
flush_work() is implemented, it has a noticeable difference of not
allowing work items to be freed while being executed.

While the current users of kthread_worker are okay with the current
behavior, the restriction does impede some valid use cases.  Also,
removing this difference isn't difficult and actually makes the code
easier to understand.

This patch reimplements flush_kthread_work() such that it uses a
flush_work item instead of queue/done sequence numbers.

Signed-off-by: Tejun Heo <tj@kernel.org>

Change-Id: I06e2ab5ef8ea3caa8e40257da0a636ab9eb5ae55
kthread: Implement park/unpark facility

To avoid the full teardown/setup of per cpu kthreads in the case of
cpu hot(un)plug, provide a facility which allows to put the kthread
into a park position and unpark it when the cpu comes online again.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120716103948.236618824@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Change-Id: I05d28788540b666349bafecf6cb3fdc873b6cdde
smpboot: Provide infrastructure for percpu hotplug threads

Provide a generic interface for setting up and tearing down percpu
threads.

On registration the threads for already online cpus are created and
started. On deregistration (modules) the threads are stoppped.

During hotplug operations the threads are created, started, parked and
unparked. The datastructure for registration provides a pointer to
percpu storage space and optional setup, cleanup, park, unpark
functions. These functions are called when the thread state changes.

Each implementation has to provide a function which is queried and
returns whether the thread should run and the thread function itself.

The core code handles all state transitions and avoids duplicated code
in the call sites.

[ paulmck: Preemption leak fix ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20120716103948.352501068@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Change-Id: Ib2ac667cd13cf26a042d65c1b3f20fe7e4b02423

Conflicts:
	kernel/cpu.c