diff options
| author |   Johannes Berg <johannes.berg@intel.com> | 2020-12-02 20:58:06 +0100 |
|---|---|---|
| committer |   Richard Weinberger <richard@nod.at> | 2020-12-13 22:22:46 +0100 |
| commit | 92dcd3d31843fbe1a95d880dc912e1f6beac6632 (patch) | |
| tree | db1504515c3e6c742212573aaef535345de81655 /arch/um/os-Linux | |
| parent | um: time: Fix read_persistent_clock64() in time-travel (diff) | |
| download | linux-dev-92dcd3d31843fbe1a95d880dc912e1f6beac6632.tar.xz linux-dev-92dcd3d31843fbe1a95d880dc912e1f6beac6632.zip | |
um: Allow PM with suspend-to-idle
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>
Diffstat (limited to 'arch/um/os-Linux')
| -rw-r--r-- | arch/um/os-Linux/signal.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index b58bc68cbe64..0a2ea84033b4 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -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) |