1 files changed, 43 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index 2875f1f74a07..b464d12761ba 100644
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -99,9 +99,38 @@ Description:
 
                 dmesg -s 1000000 | grep 'hash matches'
 
+                If you do not get any matches (or they appear to be false
+                positives), it is possible that the last PM event point
+                referred to a device created by a loadable kernel module.  In
+                this case cat /sys/power/pm_trace_dev_match (see below) after
+                your system is started up and the kernel modules are loaded.
+
                 CAUTION: Using it will cause your machine's real-time (CMOS)
                 clock to be set to a random invalid time after a resume.
 
+What;           /sys/power/pm_trace_dev_match
+Date:           October 2010
+Contact:        James Hogan <james@albanarts.com>
+Description:
+                The /sys/power/pm_trace_dev_match file contains the name of the
+                device associated with the last PM event point saved in the RTC
+                across reboots when pm_trace has been used.  More precisely it
+                contains the list of current devices (including those
+                registered by loadable kernel modules since boot) which match
+                the device hash in the RTC at boot, with a newline after each
+                one.
+
+                The advantage of this file over the hash matches printed to the
+                kernel log (see /sys/power/pm_trace), is that it includes
+                devices created after boot by loadable kernel modules.
+
+                Due to the small hash size necessary to fit in the RTC, it is
+                possible that more than one device matches the hash, in which
+                case further investigation is required to determine which
+                device is causing the problem.  Note that genuine RTC clock
+                values (such as when pm_trace has not been used), can still
+                match a device and output it's name here.
+
 What:           /sys/power/pm_async
 Date:           January 2009
 Contact:        Rafael J. Wysocki <rjw@sisk.pl>
@@ -129,3 +158,17 @@ Description:
                 successful, will make the kernel abort a subsequent transition
                 to a sleep state if any wakeup events are reported after the
                 write has returned.
+
+What:           /sys/power/reserved_size
+Date:           May 2011
+Contact:        Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+                The /sys/power/reserved_size file allows user space to control
+                the amount of memory reserved for allocations made by device
+                drivers during the "device freeze" stage of hibernation.  It can
+                be written a string representing a non-negative integer that
+                will be used as the amount of memory to reserve for allocations
+                made by device drivers' "freeze" callbacks, in bytes.
+
+                Reading from this file will display the current value, which is
+                set to 1 MB by default.