In preparation for switching linuxulator to the use the native 1:1

threads refactor kern_sched_rr_get_interval() and sys_sched_rr_get_interval().
Add a kern_sched_rr_get_interval() counterpart which takes a targettd
parameter to allow specify target thread directly by callee (new Linuxulator).

Linuxulator temporarily uses first thread in proc.

Move linux_sched_rr_get_interval() to the MI part.

Differential Revision:	https://reviews.freebsd.org/D1032
Reviewed by:	trasz

4 files changed, 48 insertions, 19 deletions

diff --git a/sys/amd64/linux32/linux32_machdep.c b/sys/amd64/linux32/linux32_machdep.c
index 155e90b..339c898 100644
--- a/sys/amd64/linux32/linux32_machdep.c
+++ b/sys/amd64/linux32/linux32_machdep.c
@@ -925,22 +925,6 @@ linux_getrusage(struct thread *td, struct linux_getrusage_args *uap)
 }
 
 int
-linux_sched_rr_get_interval(struct thread *td,
-    struct linux_sched_rr_get_interval_args *uap)
-{
-	struct timespec ts;
-	struct l_timespec ts32;
-	int error;
-
-	error = kern_sched_rr_get_interval(td, uap->pid, &ts);
-	if (error != 0)
-		return (error);
-	ts32.tv_sec = ts.tv_sec;
-	ts32.tv_nsec = ts.tv_nsec;
-	return (copyout(&ts32, uap->interval, sizeof(ts32)));
-}
-
-int
 linux_set_thread_area(struct thread *td,
     struct linux_set_thread_area_args *args)
 {
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
index ec531d3..f804f0e 100644
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -1928,3 +1928,33 @@ linux_sched_setaffinity(struct thread *td,
 
 	return (sys_cpuset_setaffinity(td, &csa));
 }
+
+int
+linux_sched_rr_get_interval(struct thread *td,
+    struct linux_sched_rr_get_interval_args *uap)
+{
+	struct timespec ts;
+	struct l_timespec lts;
+	struct thread *tdt;
+	struct proc *p;
+	int error;
+
+	if (uap->pid == 0) {
+		tdt = td;
+		p = tdt->td_proc;
+		PROC_LOCK(p);
+	} else {
+		p = pfind(uap->pid);
+		if (p == NULL)
+			return (ESRCH);
+		tdt = FIRST_THREAD_IN_PROC(p);
+	}
+
+	error = kern_sched_rr_get_interval_td(td, tdt, &ts);
+	PROC_UNLOCK(p);
+	if (error != 0)
+		return (error);
+	lts.tv_sec = ts.tv_sec;
+	lts.tv_nsec = ts.tv_nsec;
+	return (copyout(&lts, uap->interval, sizeof(lts)));
+}
diff --git a/sys/kern/p1003_1b.c b/sys/kern/p1003_1b.c
index fb89efc..3d1656a 100644
--- a/sys/kern/p1003_1b.c
+++ b/sys/kern/p1003_1b.c
@@ -296,13 +296,26 @@ kern_sched_rr_get_interval(struct thread *td, pid_t pid,
 		targettd = FIRST_THREAD_IN_PROC(targetp);
 	}
 
-	e = p_cansee(td, targetp);
-	if (e == 0)
-		e = ksched_rr_get_interval(ksched, targettd, ts);
+	e = kern_sched_rr_get_interval_td(td, targettd, ts);
 	PROC_UNLOCK(targetp);
 	return (e);
 }
 
+int
+kern_sched_rr_get_interval_td(struct thread *td, struct thread *targettd,
+    struct timespec *ts)
+{
+	struct proc *p;
+	int error;
+
+	p = targettd->td_proc;
+	PROC_LOCK_ASSERT(p, MA_OWNED);
+
+	error = p_cansee(td, p);
+	if (error == 0)
+		error = ksched_rr_get_interval(ksched, targettd, ts);
+	return (error);
+}
 #endif
 
 static void
diff --git a/sys/sys/syscallsubr.h b/sys/sys/syscallsubr.h
index 4954e46..debb728 100644
--- a/sys/sys/syscallsubr.h
+++ b/sys/sys/syscallsubr.h
@@ -171,6 +171,8 @@ int	kern_rmdirat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg);
 int	kern_sched_rr_get_interval(struct thread *td, pid_t pid,
 	    struct timespec *ts);
+int	kern_sched_rr_get_interval_td(struct thread *td, struct thread *targettd,
+	    struct timespec *ts);
 int	kern_semctl(struct thread *td, int semid, int semnum, int cmd,
 	    union semun *arg, register_t *rval);
 int	kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou,