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um: Allow PM with suspend-to-idle

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[ Upstream commit 92dcd3d31843fbe1a95d880dc912e1f6beac6632 ]

In order to be able to experiment with suspend in UML, add the
minimal work to be able to suspend (s2idle) an instance of UML,
and be able to wake it back up from that state with the USR1
signal sent to the main UML process.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johannes Berg
2020-12-02 20:58:06 +01:00
committed by Greg Kroah-Hartman
parent c6cf21d8d5
commit b58294ce1a
5 changed files with 46 additions and 1 deletions
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14
arch/um/os-Linux/signal.c
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@@ -136,6 +136,16 @@ void set_sigstack(void *sig_stack, int size)
panic("enabling signal stack failed, errno = %d\n", errno);
}
static void sigusr1_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
{
uml_pm_wake();
}
void register_pm_wake_signal(void)
{
set_handler(SIGUSR1);
}
static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
[SIGSEGV] = sig_handler,
[SIGBUS] = sig_handler,
@@ -145,7 +155,9 @@ static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
[SIGIO] = sig_handler,
[SIGWINCH] = sig_handler,
[SIGALRM] = timer_alarm_handler
[SIGALRM] = timer_alarm_handler,
[SIGUSR1] = sigusr1_handler,
};
static void hard_handler(int sig, siginfo_t *si, void *p)