OpenCloudOS-Kernel/arch/powerpc/platforms/powernv
Shreyas B. Prabhu 7cba160ad7 powernv/cpuidle: Redesign idle states management
Deep idle states like sleep and winkle are per core idle states. A core
enters these states only when all the threads enter either the
particular idle state or a deeper one. There are tasks like fastsleep
hardware bug workaround and hypervisor core state save which have to be
done only by the last thread of the core entering deep idle state and
similarly tasks like timebase resync, hypervisor core register restore
that have to be done only by the first thread waking up from these
state.

The current idle state management does not have a way to distinguish the
first/last thread of the core waking/entering idle states. Tasks like
timebase resync are done for all the threads. This is not only is
suboptimal, but can cause functionality issues when subcores and kvm is
involved.

This patch adds the necessary infrastructure to track idle states of
threads in a per-core structure. It uses this info to perform tasks like
fastsleep workaround and timebase resync only once per core.

Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Originally-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: linux-pm@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2014-12-15 10:46:40 +11:00
..
Kconfig powerpc/powernv: Enable POWER8 doorbell IPIs 2014-06-11 17:05:12 +10:00
Makefile powerpc/powernv: Invoke opal call to handle hmi. 2014-08-05 16:33:52 +10:00
eeh-ioda.c powerpc/eeh: Dump PHB diag-data early 2014-12-02 11:03:26 +11:00
eeh-powernv.c powerpc/eeh: Block CFG upon frozen Shiner adapter 2014-10-15 11:27:34 +11:00
opal-async.c rtc/tpo: Driver to support rtc and wakeup on PowerNV platform 2014-11-17 18:04:01 +11:00
opal-dump.c powerpc/powernv: Check OPAL dump calls exist before using 2014-09-25 23:14:36 +10:00
opal-elog.c powerpc/powernv: Check OPAL elog calls exist before using 2014-09-25 23:14:36 +10:00
opal-flash.c powerpc/powernv: Pass buffer size to OPAL validate flash call 2014-06-05 14:54:04 +10:00
opal-hmi.c powerpc: use machine_subsys_initcall() for opal_hmi_handler_init() 2014-09-09 19:02:46 +10:00
opal-lpc.c powerpc/powernv: Properly fix LPC debugfs endianness 2014-10-31 17:09:04 +11:00
opal-memory-errors.c powerpc/powernv: Switch powernv drivers to use machine_xxx_initcall() 2014-07-28 14:11:26 +10:00
opal-msglog.c powerpc/powernv: Fix reading of OPAL msglog 2014-06-11 17:03:36 +10:00
opal-nvram.c powerpc: Add printk levels to powernv platform code 2014-10-02 17:33:55 +10:00
opal-rtc.c rtc/tpo: Driver to support rtc and wakeup on PowerNV platform 2014-11-17 18:04:01 +11:00
opal-sensor.c powerpc/powernv: Fix endian issues with sensor code 2014-04-09 12:52:49 +10:00
opal-sysparam.c powernv: Fix permissions on sysparam sysfs entries 2014-06-11 17:03:15 +10:00
opal-tracepoints.c powerpc: Replace __get_cpu_var uses 2014-11-03 12:12:32 +11:00
opal-wrappers.S powernv/cpuidle: Redesign idle states management 2014-12-15 10:46:40 +11:00
opal-xscom.c powerpc/powernv: Switch powernv drivers to use machine_xxx_initcall() 2014-07-28 14:11:26 +10:00
opal.c i2c: Driver to expose PowerNV platform i2c busses 2014-12-14 12:44:46 +11:00
pci-ioda.c powerpc: Remove more traces of bootmem 2014-11-19 21:41:51 +11:00
pci-p5ioc2.c powerpc: Remove more traces of bootmem 2014-11-19 21:41:51 +11:00
pci.c powerpc: Remove superfluous bootmem includes 2014-11-10 09:59:26 +11:00
pci.h powerpc/powernv: Rename alloc_m64_pe() to reserve_m64_pe() 2014-11-14 17:24:23 +11:00
powernv.h powerpc/powernv: Enable Offline CPUs to enter deep idle states 2014-12-15 10:46:40 +11:00
rng.c powerpc/powernv: Switch powernv drivers to use machine_xxx_initcall() 2014-07-28 14:11:26 +10:00
setup.c powernv/cpuidle: Redesign idle states management 2014-12-15 10:46:40 +11:00
smp.c powernv/cpuidle: Redesign idle states management 2014-12-15 10:46:40 +11:00
subcore-asm.S powerpc/powernv: Add support for POWER8 split core on powernv 2014-05-28 13:35:37 +10:00
subcore.c powerpc: Ensure global functions include their prototype 2014-09-25 23:14:42 +10:00
subcore.h powerpc/powernv: Add support for POWER8 split core on powernv 2014-05-28 13:35:37 +10:00