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Commit 1ab2b818 authored by Steven Moreland's avatar Steven Moreland Committed by Automerger Merge Worker
Browse files

Merge "libbinder: support inheriting realtime priority" am: ab861953 

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1516611

Change-Id: I951bcd1f404a5b9c3a2f03cef932be5c76d01a7c
parents 70b88cb2 ab861953

libs/binder/Binder.cpp

+22 −0
Original line number Diff line number Diff line
@@ -133,6 +133,7 @@ class BBinder::Extras 
public:

    // unlocked objects

    bool mRequestingSid = false;

    bool mInheritRt = false;

    sp<IBinder> mExtension;

    int mPolicy = SCHED_NORMAL;

    int mPriority = 0;
@@ -327,6 +328,27 @@ int BBinder::getMinSchedulerPriority() { 
    return e->mPriority;

}



bool BBinder::isInheritRt() {

    Extras* e = mExtras.load(std::memory_order_acquire);



    return e && e->mInheritRt;

}



void BBinder::setInheritRt(bool inheritRt) {

    Extras* e = mExtras.load(std::memory_order_acquire);



    if (!e) {

        if (!inheritRt) {

            return;

        }



        e = getOrCreateExtras();

        if (!e) return; // out of memory

    }



    e->mInheritRt = inheritRt;

}



pid_t BBinder::getDebugPid() {

    return getpid();

}

libs/binder/Parcel.cpp

+3 −0
Original line number Diff line number Diff line
@@ -222,6 +222,9 @@ status_t Parcel::flattenBinder(const sp<IBinder>& binder) 
            if (local->isRequestingSid()) {

                obj.flags |= FLAT_BINDER_FLAG_TXN_SECURITY_CTX;

            }

            if (local->isInheritRt()) {

                obj.flags |= FLAT_BINDER_FLAG_INHERIT_RT;

            }

            obj.hdr.type = BINDER_TYPE_BINDER;

            obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());

            obj.cookie = reinterpret_cast<uintptr_t>(local);

libs/binder/include/binder/Binder.h

+5 −0
Original line number Diff line number Diff line
@@ -87,6 +87,11 @@ public: 
    int                 getMinSchedulerPolicy();

    int                 getMinSchedulerPriority();



    // Whether realtime scheduling policies are inherited.

    bool                isInheritRt();

    // This must be called before the object is sent to another process. Not thread safe.

    void                setInheritRt(bool inheritRt);



    pid_t               getDebugPid();



protected:

libs/binder/tests/binderLibTest.cpp

+23 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <binder/IServiceManager.h>



#include <private/binder/binder_module.h>

#include <linux/sched.h>

#include <sys/epoll.h>

#include <sys/prctl.h>
@@ -53,6 +54,7 @@ static char binderserverarg[] = "--binderserver"; 


static constexpr int kSchedPolicy = SCHED_RR;

static constexpr int kSchedPriority = 7;

static constexpr int kSchedPriorityMore = 8;



static String16 binderLibTestServiceName = String16("test.binderLib");
@@ -1088,6 +1090,25 @@ TEST_F(BinderLibTest, SchedPolicySet) { 
    EXPECT_EQ(kSchedPriority, priority);

}



TEST_F(BinderLibTest, InheritRt) {

    sp<IBinder> server = addServer();

    ASSERT_TRUE(server != nullptr);



    const struct sched_param param {

        .sched_priority = kSchedPriorityMore,

    };

    EXPECT_EQ(0, sched_setscheduler(getpid(), SCHED_RR, &param));



    Parcel data, reply;

    status_t ret = server->transact(BINDER_LIB_TEST_GET_SCHEDULING_POLICY, data, &reply);

    EXPECT_EQ(NO_ERROR, ret);



    int policy = reply.readInt32();

    int priority = reply.readInt32();



    EXPECT_EQ(kSchedPolicy, policy & (~SCHED_RESET_ON_FORK));

    EXPECT_EQ(kSchedPriorityMore, priority);

}



TEST_F(BinderLibTest, VectorSent) {

    Parcel data, reply;
@@ -1460,6 +1481,8 @@ int run_server(int index, int readypipefd, bool usePoll) 


        testService->setMinSchedulerPolicy(kSchedPolicy, kSchedPriority);



        testService->setInheritRt(true);



        /*

         * Normally would also contain functionality as well, but we are only

         * testing the extension mechanism.

libs/binder/tests/fuzzers/BinderFuzzFunctions.h

+9 −2
Original line number Diff line number Diff line
@@ -37,8 +37,8 @@ static const std::vector<std::function<void(FuzzedDataProvider*, const sp<BBinde 
                                  bbinder->isRequestingSid();

                              },

                              [](FuzzedDataProvider* fdp, const sp<BBinder>& bbinder) -> void {

                                  bool request_sid = fdp->ConsumeBool();

                                  bbinder->setRequestingSid(request_sid);

                                  bool requestSid = fdp->ConsumeBool();

                                  bbinder->setRequestingSid(requestSid);

                              },

                              [](FuzzedDataProvider*, const sp<BBinder>& bbinder) -> void {

                                  bbinder->getExtension();
@@ -63,6 +63,13 @@ static const std::vector<std::function<void(FuzzedDataProvider*, const sp<BBinde 
                              [](FuzzedDataProvider*, const sp<BBinder>& bbinder) -> void {

                                  bbinder->getMinSchedulerPriority();

                              },

                              [](FuzzedDataProvider* fdp, const sp<BBinder>& bbinder) -> void {

                                  bool inheritRt = fdp->ConsumeBool();

                                  bbinder->setInheritRt(inheritRt);

                              },

                              [](FuzzedDataProvider*, const sp<BBinder>& bbinder) -> void {

                                  bbinder->isInheritRt();

                              },

                              [](FuzzedDataProvider*, const sp<BBinder>& bbinder) -> void {

                                  bbinder->getDebugPid();

                              }};