On 08/07/16 15:43, Lorenzo Pieralisi wrote:
On Fri, Jul 08, 2016 at 12:04:40PM +0100, Sudeep Holla wrote:
On 07/07/16 22:02, Rafael J. Wysocki wrote:
On Thu, Jul 7, 2016 at 7:10 PM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote:
ACPI 6.0 introduced LPI(Low Power Idle) states that provides an alternate
method to describe processor idle states. It extends the specification
to allow the expression of idle states like C-states selectable by the
OSPM when a processor goes idle, but may affect more than one processor,
and may affect other system components.
LPI extensions leverages the processor container device(again introduced
in ACPI 6.0) allowing to express which parts of the system are affected
by a given LPI state. It defines the local power states for each node
in a hierarchical processor topology. The OSPM can use _LPI object to
select a local power state for each level of processor hierarchy in the
system. They used to produce a composite power state request that is
presented to the platform by the OSPM.
Since multiple processors affect the idle state for any non-leaf hierarchy
node, coordination of idle state requests between the processors is
required. ACPI supports two different coordination schemes: Platform
coordinated and OS initiated.
This series aims at providing basic and initial support for platform
coordinated LPI states.
v7[7]->v8:
- Replaced HAVE_GENERIC_CPUIDLE_ENTER with CPU_IDLE_ENTER_WRAPPED
macro, which is more cleaner and definately less confusing :)
(Thanks to Rafael for the suggestion)
Patches [3-6/6] definitely look a lot cleaner to me now. :-)
That said, the name of the macro I suggested was just an example, so
if people don't like this one, it'd be fine to change it as far as I'm
concerned.
I can think of addition to indicate it's pm notifiers wrapper.
i.e. CPU_IDLE_ENTER_PM_NOTIFIERS_WRAPPED. Is it too long ? I am happy
with the way it is too.
CPU_PM_CPU_IDLE_ENTER() ? Anyway, that's really not a problem IMO,
it makes sense to at least mention CPU PM in it given that's what
the CPUIDLE enter function is wrapped within.
Looks even better IMO, Rafael if you have no objection, I will change to
CPU_PM_CPU_IDLE_ENTER ?
--
Regards,
Sudeep
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