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s='nohover-highlight'> This patch (as1424) combines the various public entry points for the runtime PM routines into three simple functions: one for idle, one for suspend, and one for resume. A new bitflag specifies whether or not to increment or decrement the usage_count field. The new entry points are named __pm_runtime_idle, __pm_runtime_suspend, and __pm_runtime_resume, to reflect that they are trampolines. Simultaneously, the corresponding internal routines are renamed to rpm_idle, rpm_suspend, and rpm_resume. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17PM / Runtime: Merge synchronous and async runtime routinesAlan Stern1-235/+140 This patch (as1423) merges the asynchronous routines __pm_request_idle(), __pm_request_suspend(), and __pm_request_resume() with their synchronous counterparts. The RPM_ASYNC bitflag argument serves to indicate what sort of operation to perform. In the course of performing this merger, it became apparent that the various functions don't all behave consistenly with regard to error reporting and cancellation of outstanding requests. A new routine, rpm_check_suspend_allowed(), was written to centralize much of the testing, and the other functions were revised to follow a simple algorithm: If the operation is disallowed because of the device's settings or current state, return an error. Cancel pending or scheduled requests of lower priority. Schedule, queue, or perform the desired operation. A few special cases and exceptions are noted in comments. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17PM / Runtime: Replace boolean arguments with bitflagsAlan Stern2-44/+54 The "from_wq" argument in __pm_runtime_suspend() and __pm_runtime_resume() supposedly indicates whether or not the function was called by the PM workqueue thread, but in fact it isn't always used this way. It really indicates whether or not the function should return early if the requested operation is already in progress. Along with this badly-named boolean argument, later patches in this series will add several other boolean arguments to these functions and others. Therefore this patch (as1422) begins the conversion process by replacing from_wq with a bitflag argument. The same bitflags are also used in __pm_runtime_get() and __pm_runtime_put(), where they indicate whether or not the operation should be asynchronous. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17PM / Runtime: Move code in drivers/base/power/runtime.cAlan Stern1-39/+38 This patch (as1421) moves the PM runtime accounting subroutines up to the beginning of runtime.c, taking them out of the middle of the functions that do the actual work. No operational changes. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17sysfs: Add sysfs_merge_group() and sysfs_unmerge_group()Alan Stern2-0/+74 This patch (as1420) adds sysfs_merge_group() and sysfs_unmerge_group() functions, allowing drivers easily to add and remove sets of attributes to a pre-existing attribute group directory. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17PM: Fix potential issue with failing asynchronous suspendRafael J. Wysocki2-8/+14 There is a potential issue with the asynchronous suspend code that a device driver suspending asynchronously may not notice that it should back off. There are two failing scenarions, (1) when the driver is waiting for a driver suspending synchronously to complete and that second driver returns error code, in which case async_error won't be set and the waiting driver will continue suspending and (2) after the driver has called device_pm_wait_for_dev() and the waited for driver returns error code, in which case the caller of device_pm_wait_for_dev() will not know that there was an error and will continue suspending. To fix this issue make __device_suspend() set async_error, so async_suspend() doesn't need to set it any more, and make device_pm_wait_for_dev() return async_error, so that its callers can check whether or not they should continue suspending. No more changes are necessary, since device_pm_wait_for_dev() is not used by any drivers' suspend routines. Reported-by: Colin Cross <ccross@android.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> 2010-10-17PM / Wakeup: Introduce wakeup source objects and event statistics (v3)Rafael J. Wysocki10-125/+756 Introduce struct wakeup_source for representing system wakeup sources within the kernel and for collecting statistics related to them. Make the recently introduced helper functions pm_wakeup_event(), pm_stay_awake() and pm_relax() use struct wakeup_source objects internally, so that wakeup statistics associated with wakeup devices can be collected and reported in a consistent way (the definition of pm_relax() is changed, which is harmless, because this function is not called directly by anyone yet). Introduce new wakeup-related sysfs device attributes in /sys/devices/.../power for reporting the device wakeup statistics. Change the global wakeup events counters event_count and events_in_progress into atomic variables, so that it is not necessary to acquire a global spinlock in pm_wakeup_event(), pm_stay_awake() and pm_relax(), which should allow us to avoid lock contention in these functions on SMP systems with many wakeup devices. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> 2010-10-17PM: Fix signed/unsigned warning in dpm_show_time()Kevin Cernekee1-1/+1 Seen on MIPS32, gcc 4.4.3, 2.6.36-rc4: drivers/base/power/main.c: In function 'dpm_show_time': drivers/base/power/main.c:415: warning: comparison of distinct pointer types lacks a cast do_div() takes unsigned parameters: uint32_t do_div(uint64_t *n, uint32_t base); Using an unsigned variable for usecs64 should not cause any problems, because calltime >= starttime . Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17PM / Hibernate: Make default image size depend on total RAM sizeRafael J. Wysocki4-3/+16 The default hibernation image size is currently hard coded and euqal to 500 MB, which is not a reasonable default on many contemporary systems. Make it equal 2/5 of the total RAM size (this is slightly below the maximum, i.e. 1/2 of the total RAM size, and seems to be generally suitable). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: M. Vefa Bicakci <bicave@superonline.com> 2010-10-17PM / Hibernate: Improve comments in hibernate_preallocate_memory()Rafael J. Wysocki1-2/+4 One comment in hibernate_preallocate_memory() is wrong, so fix it and add one more comment to clarify the meaning of the fixed one. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17PM / Runtime: Use alloc_workqueue() for creating the PM workqueueRafael J. Wysocki1-1/+1 Although we need the PM workqueue to be freezable, we don't need it to be singlethread. Also, the number of concurrent work items running on a single CPU need not be constrained. For these reasons use alloc_workqueue() directly, with suitable arguments, instead of create_freezeable_workqueue(), to create the runtime PM workqueue. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Tejun Heo <tj@kernel.org> 2010-10-17PM: Fix unmet dependency warning from kconfigRafael J. Wysocki1-0/+1 Fix the following build warning: warning: (PM_SLEEP_SMP && SMP && (ARCH_SUSPEND_POSSIBLE || \ ARCH_HIBERNATION_POSSIBLE) && PM_SLEEP) selects HOTPLUG_CPU which \ has unmet direct dependencies (SMP && HOTPLUG) by selecting HOTPLUG along with CPU_HOTPLUG. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> 2010-10-17PM / Hibernate: Compress hibernation image with LZOBojan Smojver6-8/+306 Compress hibernation image with LZO in order to save on I/O and therefore time to hibernate/thaw. [rjw: Added hibernate=nocompress command line option instead of just nocompress which would be confusing, fixed a couple of compiler warnings, fixed kerneldoc comments, minor cleanups.] Signed-off-by: Bojan Smojver <bojan@rexursive.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-17PM / Runtime: Lenient generic runtime pm callbacksOhad Ben-Cohen1-2/+2 Allow drivers, that belong to subsystems which use the generic runtime pm callbacks, not to define runtime pm suspend/resume handlers, by implicitly assuming success in such cases. This is needed to eliminate nop handlers that would otherwise be necessary by drivers which enable runtime pm, but don't need to do anything when their devices are runtime-suspended/resumed. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Acked-by: Kevin Hilman <khilman@deeprootsystems.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> 2010-10-15m32r: test __LITTLE_ENDIAN__ instead of __LITTLE_ENDIANKyle McMartin1-2/+2 Fixes build for me... these are what's tested in byteorder.h... Signed-off-by: Kyle McMartin <kyle@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>