linux-stable/drivers
ShuoX Liu 2a77c46de1 PM / Suspend: Add statistics debugfs file for suspend to RAM
Record S3 failure time about each reason and the latest two failed
devices' names in S3 progress.
We can check it through 'suspend_stats' entry in debugfs.

The motivation of the patch:

We are enabling power features on Medfield. Comparing with PC/notebook,
a mobile enters/exits suspend-2-ram (we call it s3 on Medfield) far
more frequently. If it can't enter suspend-2-ram in time, the power
might be used up soon.

We often find sometimes, a device suspend fails. Then, system retries
s3 over and over again. As display is off, testers and developers
don't know what happens.

Some testers and developers complain they don't know if system
tries suspend-2-ram, and what device fails to suspend. They need
such info for a quick check. The patch adds suspend_stats under
debugfs for users to check suspend to RAM statistics quickly.

If not using this patch, we have other methods to get info about
what device fails. One is to turn on  CONFIG_PM_DEBUG, but users
would get too much info and testers need recompile the system.

In addition, dynamic debug is another good tool to dump debug info.
But it still doesn't match our utilization scenario closely.
1) user need write a user space parser to process the syslog output;
2) Our testing scenario is we leave the mobile for at least hours.
   Then, check its status. No serial console available during the
   testing. One is because console would be suspended, and the other
   is serial console connecting with spi or HSU devices would consume
   power. These devices are powered off at suspend-2-ram.

Signed-off-by: ShuoX Liu <shuox.liu@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-10-16 23:27:45 +02:00
..
accessibility
acpi Merge branch 'pm-qos' into pm-for-linus 2011-10-07 23:17:07 +02:00
amba
ata drivers/ata/sata_dwc_460ex.c: add missing kfree 2011-08-18 23:58:11 -04:00
atm
auxdisplay
base PM / Suspend: Add statistics debugfs file for suspend to RAM 2011-10-16 23:27:45 +02:00
bcma bcma: add uevent to the bus, to autoload drivers 2011-08-22 14:21:41 -04:00
block floppy: use del_timer_sync() in init cleanup 2011-09-21 10:22:11 +02:00
bluetooth Merge branch 'pm-runtime' into pm-for-linus 2011-10-07 23:16:55 +02:00
cdrom
char TPM: Zero buffer after copying to userspace 2011-09-23 09:46:41 +10:00
clk
clocksource Merge branch 'common/core' into sh-latest 2011-08-08 16:33:54 +09:00
connector
cpufreq drivers/cpufreq/pcc-cpufreq.c: avoid NULL pointer dereference 2011-09-14 18:09:38 -07:00
cpuidle PM QoS: Move and rename the implementation files 2011-08-25 15:35:03 +02:00
crypto
dca
devfreq PM / devfreq: Add basic governors 2011-10-02 00:19:34 +02:00
dio
dma dmaengine/ste_dma40: fix memory leak due to prepared descriptors 2011-09-05 17:08:26 +05:30
edac i7core_edac: fixed typo in error count calculation 2011-08-18 14:07:15 -07:00
eisa eisa/pci_eisa.c: fix BUG introduced by 005bdad7b8 2011-08-04 06:32:51 -10:00
firewire firewire: ohci: add no MSI quirk for O2Micro controller 2011-09-16 22:22:10 +02:00
firmware firmware: fix google/gsmi.c build warning 2011-08-08 13:53:49 -07:00
gpio drivers/gpio/gpio-generic.c: fix build errors 2011-09-14 18:09:38 -07:00
gpu drm/radeon/kms: fix channel_remap setup (v2) 2011-10-04 17:24:14 +01:00
hid Merge branch 'pm-runtime' into pm-for-linus 2011-10-07 23:16:55 +02:00
hwmon hwmon: (coretemp) Avoid leaving around dangling pointer 2011-09-28 08:19:21 -07:00
hwspinlock
i2c i2c-tegra: fix possible race condition after tx 2011-09-07 00:13:40 +01:00
ide ide-disk: Fix request requeuing 2011-10-03 14:28:18 -04:00
idle
ieee802154
infiniband [SCSI] cxgb3i: convert cdev->l2opt to use rcu to prevent NULL dereference 2011-09-26 09:28:01 -05:00
input Merge branch 'for-linus' of git://github.com/dtor/input 2011-10-05 09:22:38 -07:00
iommu x86, iommu: Mark DMAR IRQ as non-threaded 2011-09-13 23:44:53 +02:00
isdn
leds drivers/leds/ledtrig-timer.c: fix broken sysfs delay handling 2011-09-14 18:09:38 -07:00
lguest
macintosh
mca
md Merge branch 'for-linus' of http://people.redhat.com/agk/git/linux-dm 2011-10-06 08:31:47 -07:00
media Merge branch 'pm-qos' into pm-for-linus 2011-10-07 23:17:07 +02:00
memstick
message
mfd mfd: Fix generic irq chip ack function name for jz4740-adc 2011-09-21 13:06:34 +02:00
misc lis3: fix regression of HP DriveGuard with 8bit chip 2011-10-03 20:51:51 -07:00
mmc Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2011-09-21 13:20:21 -07:00
mtd UBI: do not link debug messages when debugging is disabled 2011-08-19 19:02:27 +03:00
net Merge branch 'pm-qos' into pm-for-linus 2011-10-07 23:17:07 +02:00
nfc
nubus
of Revert "dt: add of_alias_scan and of_alias_get_id" 2011-08-04 11:26:24 +01:00
oprofile
parisc
parport
pci PCI: Disable MPS configuration by default 2011-10-04 09:52:28 -07:00
pcmcia
platform acer-wmi: support Lenovo ideapad S205 wifi switch 2011-08-05 15:21:52 -04:00
pnp
power s3c-adc-battery: Fix compilation error due to missing header (module.h) 2011-08-19 21:01:46 +04:00
pps
ps3
ptp
rapidio rapidio: fix use of non-compatible registers 2011-08-25 16:25:34 -07:00
regulator
rtc drivers/rtc/rtc-s3c.c: fix no occurrence of alarm interrupt 2011-09-14 18:09:38 -07:00
s390 [S390] cio: fix cio_tpi ignoring adapter interrupts 2011-09-26 16:40:50 +02:00
sbus
scsi [SCSI] libsas: fix panic when single phy is disabled on a wide port 2011-10-02 13:28:55 -05:00
sfi
sh Merge branch 'common/core' into sh-latest 2011-08-08 16:33:54 +09:00
sn
spi spi-topcliff-pch: Fix overrun issue 2011-10-04 10:10:50 -06:00
ssb
staging staging: zcache: fix cleancache crash 2011-09-20 14:17:13 -07:00
target iscsi-target: Fix sendpage breakage with proper padding+DataDigest iovec offsets 2011-09-16 23:47:07 +00:00
tc
telephony
thermal
tty cris: fix a build error in drivers/tty/serial/crisv10.c 2011-09-14 18:09:38 -07:00
uio
usb Merge branch 'pm-runtime' into pm-for-linus 2011-10-07 23:16:55 +02:00
uwb
vhost
video backlight: Declare backlight_types[] const 2011-09-10 14:00:02 -07:00
virt
virtio
vlynq
w1 MAINTAINERS: Evgeniy has moved 2011-08-25 16:25:33 -07:00
watchdog watchdog: Initconst section fixes for watchdog 2011-09-20 14:32:00 +02:00
xen xen/irq: Alter the locking to use a mutex instead of a spinlock. 2011-09-15 04:32:02 -04:00
zorro zorro: Defer device_register() until all devices have been identified 2011-09-22 12:59:35 -07:00
Kconfig PM: Introduce devfreq: generic DVFS framework with device-specific OPPs 2011-10-02 00:19:15 +02:00
Makefile PM: Introduce devfreq: generic DVFS framework with device-specific OPPs 2011-10-02 00:19:15 +02:00