Hi! > Modify the hibernation userland interface by adding two new ioctls to it, > SNAPSHOT_PLATFORM_SUPPORT and SNAPSHOT_POWER_OFF, that can be used, > respectively, to switch the hibernation platform support on/off and to make the > kernel transition the system to the hibernation state (eg. ACPI S4) using the > platform (eg. ACPI) driver. > > These ioctls are intended to replace the misdesigned SNAPSHOT_PMOPS ioctl, > which from now is regarded as obsolete and will be removed in the future. > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> ACK. > +/* > + * NOTE: The SNAPSHOT_PMOPS ioctl is obsolete and will be removed in the > + * future. It is only preserved here for compatibility with existing userland > + * utilities. > + */ Perhaps that paragraph from Documentation should be moved here, so that people know what this obsolete ioctl() is expected to do? > @@ -95,24 +101,6 @@ SNAPSHOT_S2RAM - suspend to RAM; using t > to resume the system from RAM if there's enough battery power or restore > its state on the basis of the saved suspend image otherwise) > > -SNAPSHOT_PMOPS - enable the usage of the hibernation_ops->prepare, > - hibernate_ops->enter and hibernation_ops->finish methods (the in-kernel > - swsusp knows these as the "platform method") which are needed on many > - machines to (among others) speed up the resume by letting the BIOS skip > - some steps or to let the system recognise the correct state of the > - hardware after the resume (in particular on many machines this ensures > - that unplugged AC adapters get correctly detected and that kacpid does > - not run wild after the resume). The last ioctl() argument can take one > - of the three values, defined in kernel/power/power.h: > - PMOPS_PREPARE - make the kernel carry out the > - hibernation_ops->prepare() operation > - PMOPS_ENTER - make the kernel power off the system by calling > - hibernation_ops->enter() > - PMOPS_FINISH - make the kernel carry out the > - hibernation_ops->finish() operation > - Note that the actual constants are misnamed because they surface > - internal kernel implementation details that have changed. > - > The device's read() operation can be used to transfer the snapshot image from > the kernel. It has the following limitations: > - you cannot read() more than one virtual memory page at a time Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
