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Allow to change CPU-DMA setting w/o restart

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This commit is contained in:
Robin Gareus 2021-06-10 20:21:32 +02:00
parent 7ce43739e8
commit 53499648be
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 27 additions and 9 deletions
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36
libs/ardour/globals.cc
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@ -178,6 +178,7 @@ extern void setup_enum_writer ();
PBD::PropertyChange ARDOUR::bounds_change;
static PBD::ScopedConnection engine_startup_connection;
static PBD::ScopedConnection config_connection;
void
setup_hardware_optimization (bool try_optimization)
@ -284,6 +285,18 @@ setup_hardware_optimization (bool try_optimization)
AudioGrapher::Routines::override_apply_gain_to_buffer (apply_gain_to_buffer);
}
static void
release_dma_latency ()
{
#if !(defined PLATFORM_WINDOWS || defined __APPLE__)
if (cpu_dma_latency_fd >= 0) {
info << _("Released CPU DMA latency request") << endmsg;
::close (cpu_dma_latency_fd);
}
cpu_dma_latency_fd = -1;
#endif
}
static bool
request_dma_latency ()
{
@ -295,29 +308,31 @@ request_dma_latency ()
/* maximum latency in usecs, or 0 to prevent transitions to deep sleep states */
int32_t target = Config->get_cpu_dma_latency ();
if (target < 0) {
release_dma_latency ();
return true;
}
cpu_dma_latency_fd = ::open("/dev/cpu_dma_latency", O_WRONLY);
if (cpu_dma_latency_fd < 0) {
warning << string_compose (_("Could not set DMA latency to %1 usec (%2)"), target, strerror (errno)) << endmsg;
warning << string_compose (_("Could not set CPU DMA latency to %1 usec (%2)"), target, strerror (errno)) << endmsg;
return false;
}
if (::write (cpu_dma_latency_fd, &target, sizeof(target)) > 0) {
info << string_compose (_("Set DMA latency to %1 usec"), target) << endmsg;
info << string_compose (_("Set CPU DMA latency to %1 usec"), target) << endmsg;
} else {
warning << string_compose (_("Could not set DMA latency to %1 usec (%2)"), target, strerror (errno)) << endmsg;
warning << string_compose (_("Could not set CPU DMA latency to %1 usec (%2)"), target, strerror (errno)) << endmsg;
}
#endif
return true;
}
static void
release_dma_latency ()
config_changed (std::string what_changed)
{
#if !(defined PLATFORM_WINDOWS || defined __APPLE__)
if (cpu_dma_latency_fd >= 0) {
::close (cpu_dma_latency_fd);
if (what_changed == "cpu-dma-latency") {
request_dma_latency ();
}
cpu_dma_latency_fd = -1;
#endif
}
static void
@ -672,6 +687,8 @@ ARDOUR::init (bool use_windows_vst, bool try_optimization, const char* localedir
MIDI::Name::MidiPatchManager::instance ().load_midnams_in_thread ();
Config->ParameterChanged.connect_same_thread (config_connection, boost::bind (&config_changed, _1));
libardour_initialized = true;
return true;
@ -711,6 +728,7 @@ ARDOUR::cleanup ()
}
release_dma_latency ();
config_connection.disconnect ();
engine_startup_connection.disconnect ();
delete &ControlProtocolManager::instance ();