profcollectd: add interface to wait for ETM after boot.

ETM device may not be ready when profcollectd is started.
So this CL adds interface to wait for ETM after boot:

1. In simpleperf_profcollect, split has_support() into
   has_driver_support() and has_device_support().
2. In ProfcollectdBinderService and Scheduler, add interface
   to register ProviderStatusCallback, which is called when
   the trace provider is ready.
3. In profcollectd, register ProviderStatusCallback after boot.
   Then record boot profile and schedule periodic recording in
   the callback.

Bug: 213519191
Test: on oriole EVT and DVT devices, profcollectd can record boot
Test: profile and periodic profiles.
Test: run simpleperf_unit_test.
Change-Id: I87befcd372ad85a0131116a7925f303b4990ec47

1 files changed, 4 insertions, 0 deletions

diff --git a/profcollectd/libprofcollectd/logging_trace_provider.rs b/profcollectd/libprofcollectd/logging_trace_provider.rs
index 1325855d..fda4c66a 100644
--- a/profcollectd/libprofcollectd/logging_trace_provider.rs
+++ b/profcollectd/libprofcollectd/logging_trace_provider.rs
@@ -32,6 +32,10 @@ impl TraceProvider for LoggingTraceProvider {
         "logging"
     }
 
+    fn is_ready(&self) -> bool {
+        true
+    }
+
     fn trace(&self, trace_dir: &Path, tag: &str, sampling_period: &Duration) {
         let trace_file = trace_provider::get_path(trace_dir, tag, LOGGING_TRACEFILE_EXTENSION);