Allow setting a minimum scheduler policy for a service.
The binder kernel driver supports priority inheritance
at a node (service)-basis, that makes sure all transactions
into that service are executed at a specified minimum
scheduler policy and priority.
This change allows users of HIDL interfaces to set
such a policy for their interface.
Bug: 37293077
Bug: 63899698
Test: verified min_prio in /d/binder output
Merged-In: If72dd8322381246832b460c386dda44fbd225757
Change-Id: If72dd8322381246832b460c386dda44fbd225757
diff --git a/transport/include/hidl/HidlTransportSupport.h b/transport/include/hidl/HidlTransportSupport.h
index 3cac1e9..0c174f7 100644
--- a/transport/include/hidl/HidlTransportSupport.h
+++ b/transport/include/hidl/HidlTransportSupport.h
@@ -17,6 +17,7 @@
#ifndef ANDROID_HIDL_TRANSPORT_SUPPORT_H
#define ANDROID_HIDL_TRANSPORT_SUPPORT_H
+#include <android/hidl/base/1.0/IBase.h>
#include <hidl/HidlBinderSupport.h>
#include <hidl/HidlSupport.h>
#include <hidl/HidlTransportUtils.h>
@@ -47,6 +48,20 @@
*/
void joinRpcThreadpool();
+/**
+ * Sets a minimum scheduler policy for all transactions coming into this
+ * service.
+ *
+ * This method MUST be called before passing this service to another process
+ * and/or registering it with registerAsService().
+ *
+ * @param service the service to set the policy for
+ * @param policy scheduler policy as defined in linux UAPI
+ * @param priority priority. [-20..19] for SCHED_NORMAL, [1..99] for RT
+ */
+bool setMinSchedulerPolicy(const sp<::android::hidl::base::V1_0::IBase>& service,
+ int policy, int priority);
+
namespace details {
// cast the interface IParent to IChild.
diff --git a/transport/include/hidl/Static.h b/transport/include/hidl/Static.h
index e6c9139..0133ff7 100644
--- a/transport/include/hidl/Static.h
+++ b/transport/include/hidl/Static.h
@@ -28,12 +28,19 @@
namespace hardware {
namespace details {
+struct SchedPrio {
+ int sched_policy;
+ int prio;
+};
+
// For HidlBinderSupport and autogenerated code
// value function receives reinterpret_cast<void *>(static_cast<IFoo *>(foo)),
// returns sp<IBinder>
extern ConcurrentMap<std::string,
std::function<sp<IBinder>(void *)>> gBnConstructorMap;
+extern ConcurrentMap<wp<::android::hidl::base::V1_0::IBase>, SchedPrio> gServicePrioMap;
+
// For HidlPassthroughSupport and autogenerated code
// value function receives reinterpret_cast<void *>(static_cast<IFoo *>(foo)),
// returns sp<IBase>