Johannes Berg a374b7cb1e um: Support suspend to RAM ... With all the previous bits in place, we can now also support suspend to RAM, in the sense that everything is suspended, not just most, including userspace, processes like in s2idle. Since um_idle_sleep() now waits forever, we can simply call that to "suspend" the system. As before, you can wake it up using SIGUSR1 since we're just in a pause() call that only needs to return. In order to implement selective resume from certain devices, and not have any arbitrary device interrupt wake up, suspend interrupts by removing SIGIO notification (O_ASYNC) from all the FDs that are not supposed to wake up the system. However, swap out the handler so we don't actually handle the SIGIO as an interrupt. Since we're in pause(), the mere act of receiving SIGIO wakes us up, and then after things have been restored enough, re-set O_ASYNC for all previously suspended FDs, reinstall the proper SIGIO handler, and send SIGIO to self to process anything that might now be pending. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>		2020-12-13 22:22:49 +01:00
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asm	um: virtio: Use dynamic IRQ allocation	2020-12-13 22:22:11 +01:00
linux	um: Simplify os_idle_sleep() and sleep longer	2020-12-13 22:22:37 +01:00
shared	um: Support suspend to RAM	2020-12-13 22:22:49 +01:00