 @@ -1,676 +1,675 @@
-/*	$NetBSD: linux_sched.c,v 1.58 2008/10/25 23:38:28 christos Exp $	*/
+/*	$NetBSD: linux_sched.c,v 1.58.10.1 2009/06/19 21:41:33 snj Exp $	*/
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
  * All rights reserved.
+ *
  * This code is derived from software contributed to The NetBSD Foundation
  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
  * NASA Ames Research Center; by Matthias Scheler.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 /*
  * Linux compatibility module. Try to deal with scheduler related syscalls.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sched.c,v 1.58 2008/10/25 23:38:28 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_sched.c,v 1.58.10.1 2009/06/19 21:41:33 snj Exp $");
 #include <sys/param.h>
 #include <sys/mount.h>
 #include <sys/proc.h>
 #include <sys/systm.h>
 #include <sys/sysctl.h>
 #include <sys/malloc.h>
 #include <sys/syscallargs.h>
 #include <sys/wait.h>
 #include <sys/kauth.h>
 #include <sys/ptrace.h>
 #include <sys/cpu.h>
 #include <compat/linux/common/linux_types.h>
 #include <compat/linux/common/linux_signal.h>
 #include <compat/linux/common/linux_machdep.h> /* For LINUX_NPTL */
 #include <compat/linux/common/linux_emuldata.h>
 #include <compat/linux/common/linux_ipc.h>
 #include <compat/linux/common/linux_sem.h>
 #include <compat/linux/common/linux_exec.h>
 #include <compat/linux/linux_syscallargs.h>
 #include <compat/linux/common/linux_sched.h>
 int
 linux_sys_clone(struct lwp *l, const struct linux_sys_clone_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(int) flags;
 		syscallarg(void *) stack;
 #ifdef LINUX_NPTL
 		syscallarg(void *) parent_tidptr;
 		syscallarg(void *) child_tidptr;
 #endif
 	} */
 	int flags, sig;
 	int error;
 	struct proc *p;
 #ifdef LINUX_NPTL
 	struct linux_emuldata *led;
 #endif
 	/*
 	 * We don't support the Linux CLONE_PID or CLONE_PTRACE flags.
 	 */
 	if (SCARG(uap, flags) & (LINUX_CLONE_PID|LINUX_CLONE_PTRACE))
 		return (EINVAL);
 	/*
 	 * Thread group implies shared signals. Shared signals
 	 * imply shared VM. This matches what Linux kernel does.
 	 */
 	if (SCARG(uap, flags) & LINUX_CLONE_THREAD
 	    && (SCARG(uap, flags) & LINUX_CLONE_SIGHAND) == 0)
 		return (EINVAL);
 	if (SCARG(uap, flags) & LINUX_CLONE_SIGHAND
 	    && (SCARG(uap, flags) & LINUX_CLONE_VM) == 0)
 		return (EINVAL);
 	flags = 0;
 	if (SCARG(uap, flags) & LINUX_CLONE_VM)
 		flags |= FORK_SHAREVM;
 	if (SCARG(uap, flags) & LINUX_CLONE_FS)
 		flags |= FORK_SHARECWD;
 	if (SCARG(uap, flags) & LINUX_CLONE_FILES)
 		flags |= FORK_SHAREFILES;
 	if (SCARG(uap, flags) & LINUX_CLONE_SIGHAND)
 		flags |= FORK_SHARESIGS;
 	if (SCARG(uap, flags) & LINUX_CLONE_VFORK)
 		flags |= FORK_PPWAIT;
 	sig = SCARG(uap, flags) & LINUX_CLONE_CSIGNAL;
 	if (sig < 0 || sig >= LINUX__NSIG)
 		return (EINVAL);
 	sig = linux_to_native_signo[sig];
 #ifdef LINUX_NPTL
 	led = (struct linux_emuldata *)l->l_proc->p_emuldata;
 	led->parent_tidptr = SCARG(uap, parent_tidptr);
 	led->child_tidptr = SCARG(uap, child_tidptr);
 	led->clone_flags = SCARG(uap, flags);
 #endif /* LINUX_NPTL */
 	/*
 	 * Note that Linux does not provide a portable way of specifying
 	 * the stack area; the caller must know if the stack grows up
 	 * or down.  So, we pass a stack size of 0, so that the code
 	 * that makes this adjustment is a noop.
 	 */
 	if ((error = fork1(l, flags, sig, SCARG(uap, stack), 0,
 	    NULL, NULL, retval, &p)) != 0)
 		return error;
 #ifdef LINUX_NPTL
 	if ((SCARG(uap, flags) & LINUX_CLONE_SETTLS) != 0)
 		return linux_init_thread_area(l, LIST_FIRST(&p->p_lwps));
 #endif /* LINUX_NPTL */
 	return 0;
+}
 /*
  * linux realtime priority
+ *
  * - SCHED_RR and SCHED_FIFO tasks have priorities [1,99].
+ *
  * - SCHED_OTHER tasks don't have realtime priorities.
  *   in particular, sched_param::sched_priority is always 0.
  */
 #define	LINUX_SCHED_RTPRIO_MIN	1
 #define	LINUX_SCHED_RTPRIO_MAX	99
 static int
 sched_linux2native(int linux_policy, struct linux_sched_param *linux_params,
     int *native_policy, struct sched_param *native_params)
+{
 	switch (linux_policy) {
 	case LINUX_SCHED_OTHER:
 		if (native_policy != NULL) {
 			*native_policy = SCHED_OTHER;
+		}
 		break;
 	case LINUX_SCHED_FIFO:
 		if (native_policy != NULL) {
 			*native_policy = SCHED_FIFO;
+		}
 		break;
 	case LINUX_SCHED_RR:
 		if (native_policy != NULL) {
 			*native_policy = SCHED_RR;
+		}
 		break;
 	default:
 		return EINVAL;
+	}
 	if (linux_params != NULL) {
 		int prio = linux_params->sched_priority;
 		KASSERT(native_params != NULL);
 		if (linux_policy == LINUX_SCHED_OTHER) {
 			if (prio != 0) {
 				return EINVAL;
+			}
 			native_params->sched_priority = PRI_NONE; /* XXX */
 		} else {
 			if (prio < LINUX_SCHED_RTPRIO_MIN ||
 			    prio > LINUX_SCHED_RTPRIO_MAX) {
 				return EINVAL;
+			}
 			native_params->sched_priority =
 			    (prio - LINUX_SCHED_RTPRIO_MIN)
 			    * (SCHED_PRI_MAX - SCHED_PRI_MIN)
 			    / (LINUX_SCHED_RTPRIO_MAX - LINUX_SCHED_RTPRIO_MIN)
 			    + SCHED_PRI_MIN;
+		}
+	}
 	return 0;
+}
 static int
 sched_native2linux(int native_policy, struct sched_param *native_params,
     int *linux_policy, struct linux_sched_param *linux_params)
+{
 	switch (native_policy) {
 	case SCHED_OTHER:
 		if (linux_policy != NULL) {
 			*linux_policy = LINUX_SCHED_OTHER;
+		}
 		break;
 	case SCHED_FIFO:
 		if (linux_policy != NULL) {
 			*linux_policy = LINUX_SCHED_FIFO;
+		}
 		break;
 	case SCHED_RR:
 		if (linux_policy != NULL) {
 			*linux_policy = LINUX_SCHED_RR;
+		}
 		break;
 	default:
 		panic("%s: unknown policy %d\n", __func__, native_policy);
+	}
 	if (native_params != NULL) {
 		int prio = native_params->sched_priority;
 		KASSERT(prio >= SCHED_PRI_MIN);
 		KASSERT(prio <= SCHED_PRI_MAX);
 		KASSERT(linux_params != NULL);
 #ifdef DEBUG_LINUX
 		printf("native2linux: native: policy %d, priority %d\n",
 		    native_policy, prio);
 #endif
 		if (native_policy == SCHED_OTHER) {
 			linux_params->sched_priority = 0;
 		} else {
 			linux_params->sched_priority =
 			    (prio - SCHED_PRI_MIN)
 			    * (LINUX_SCHED_RTPRIO_MAX - LINUX_SCHED_RTPRIO_MIN)
 			    / (SCHED_PRI_MAX - SCHED_PRI_MIN)
 			    + LINUX_SCHED_RTPRIO_MIN;
+		}
 #ifdef DEBUG_LINUX
 		printf("native2linux: linux: policy %d, priority %d\n",
 		    -1, linux_params->sched_priority);
 #endif
+	}
 	return 0;
+}
 int
 linux_sys_sched_setparam(struct lwp *l, const struct linux_sys_sched_setparam_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(linux_pid_t) pid;
 		syscallarg(const struct linux_sched_param *) sp;
 	} */
 	int error, policy;
 	struct linux_sched_param lp;
 	struct sched_param sp;
 	if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
 		error = EINVAL;
 		goto out;
+	}
 	error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
 	if (error)
 		goto out;
 	/* We need the current policy in Linux terms. */
 	error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
 	if (error)
 		goto out;
 	error = sched_native2linux(policy, NULL, &policy, NULL);
 	if (error)
 		goto out;
 	error = sched_linux2native(policy, &lp, &policy, &sp);
 	if (error)
 		goto out;
 	error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
 	if (error)
 		goto out;
  out:
 	return error;
+}
 int
 linux_sys_sched_getparam(struct lwp *l, const struct linux_sys_sched_getparam_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(linux_pid_t) pid;
 		syscallarg(struct linux_sched_param *) sp;
 	} */
 	struct linux_sched_param lp;
 	struct sched_param sp;
 	int error, policy;
 	if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
 		error = EINVAL;
 		goto out;
+	}
 	error = do_sched_getparam(SCARG(uap, pid), 0, &policy, &sp);
 	if (error)
 		goto out;
 #ifdef DEBUG_LINUX
 	printf("getparam: native: policy %d, priority %d\n",
 	    policy, sp.sched_priority);
 #endif
 	error = sched_native2linux(policy, &sp, NULL, &lp);
 	if (error)
 		goto out;
 #ifdef DEBUG_LINUX
 	printf("getparam: linux: policy %d, priority %d\n",
 	    policy, lp.sched_priority);
 #endif
 	error = copyout(&lp, SCARG(uap, sp), sizeof(lp));
 	if (error)
 		goto out;
  out:
 	return error;
+}
 int
 linux_sys_sched_setscheduler(struct lwp *l, const struct linux_sys_sched_setscheduler_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(linux_pid_t) pid;
 		syscallarg(int) policy;
 		syscallarg(cont struct linux_sched_scheduler *) sp;
 	} */
 	int error, policy;
 	struct linux_sched_param lp;
 	struct sched_param sp;
 	if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
 		error = EINVAL;
 		goto out;
+	}
 	error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
 	if (error)
 		goto out;
 #ifdef DEBUG_LINUX
 	printf("setscheduler: linux: policy %d, priority %d\n",
 	    SCARG(uap, policy), lp.sched_priority);
 #endif
 	error = sched_linux2native(SCARG(uap, policy), &lp, &policy, &sp);
 	if (error)
 		goto out;
 #ifdef DEBUG_LINUX
 	printf("setscheduler: native: policy %d, priority %d\n",
 	    policy, sp.sched_priority);
 #endif
 	error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
 	if (error)
 		goto out;
  out:
 	return error;
+}
 int
 linux_sys_sched_getscheduler(struct lwp *l, const struct linux_sys_sched_getscheduler_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(linux_pid_t) pid;
 	} */
 	int error, policy;
 	*retval = -1;
 	error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
 	if (error)
 		goto out;
 	error = sched_native2linux(policy, NULL, &policy, NULL);
 	if (error)
 		goto out;
 	*retval = policy;
  out:
 	return error;
+}
 int
 linux_sys_sched_yield(struct lwp *l, const void *v, register_t *retval)
+{
 	yield();
 	return 0;
+}
 int
 linux_sys_sched_get_priority_max(struct lwp *l, const struct linux_sys_sched_get_priority_max_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(int) policy;
 	} */
 	switch (SCARG(uap, policy)) {
 	case LINUX_SCHED_OTHER:
 		*retval = 0;
 		break;
 	case LINUX_SCHED_FIFO:
 	case LINUX_SCHED_RR:
 		*retval = LINUX_SCHED_RTPRIO_MAX;
 		break;
 	default:
 		return EINVAL;
+	}
 	return 0;
+}
 int
 linux_sys_sched_get_priority_min(struct lwp *l, const struct linux_sys_sched_get_priority_min_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(int) policy;
 	} */
 	switch (SCARG(uap, policy)) {
 	case LINUX_SCHED_OTHER:
 		*retval = 0;
 		break;
 	case LINUX_SCHED_FIFO:
 	case LINUX_SCHED_RR:
 		*retval = LINUX_SCHED_RTPRIO_MIN;
 		break;
 	default:
 		return EINVAL;
+	}
 	return 0;
+}
 #ifndef __m68k__
 /* Present on everything but m68k */
 int
 linux_sys_exit_group(struct lwp *l, const struct linux_sys_exit_group_args *uap, register_t *retval)
+{
 #ifdef LINUX_NPTL
 	/* {
 		syscallarg(int) error_code;
 	} */
 	struct proc *p = l->l_proc;
 	struct linux_emuldata *led = p->p_emuldata;
 	struct linux_emuldata *e;
 	if (led->s->flags & LINUX_LES_USE_NPTL) {
 #ifdef DEBUG_LINUX
 		printf("%s:%d, led->s->refs = %d\n", __func__, __LINE__,
 		    led->s->refs);
 #endif
 		/*
 		 * The calling thread is supposed to kill all threads
 		 * in the same thread group (i.e. all threads created
 		 * via clone(2) with CLONE_THREAD flag set).
+		 *
 		 * If there is only one thread, things are quite simple
 		 */
 		if (led->s->refs == 1)
 			return sys_exit(l, (const void *)uap, retval);
 #ifdef DEBUG_LINUX
 		printf("%s:%d\n", __func__, __LINE__);
 #endif
 		mutex_enter(proc_lock);
 		led->s->flags |= LINUX_LES_INEXITGROUP;
 		led->s->xstat = W_EXITCODE(SCARG(uap, error_code), 0);
 		/*
 		 * Kill all threads in the group. The emulation exit hook takes
 		 * care of hiding the zombies and reporting the exit code
 		 * properly.
 		 */
       		LIST_FOREACH(e, &led->s->threads, threads) {
 			if (e->proc == p)
 				continue;
 #ifdef DEBUG_LINUX
 			printf("%s: kill PID %d\n", __func__, e->proc->p_pid);
 #endif
 			psignal(e->proc, SIGKILL);
+		}
 		/* Now, kill ourselves */
 		psignal(p, SIGKILL);
 		mutex_exit(proc_lock);
 		return 0;
+	}
 #endif /* LINUX_NPTL */
 	return sys_exit(l, (const void *)uap, retval);
+}
 #endif /* !__m68k__ */
 #ifdef LINUX_NPTL
 int
 linux_sys_set_tid_address(struct lwp *l, const struct linux_sys_set_tid_address_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(int *) tidptr;
 	} */
 	struct linux_emuldata *led;
 	led = (struct linux_emuldata *)l->l_proc->p_emuldata;
 	led->clear_tid = SCARG(uap, tid);
 	led->s->flags |= LINUX_LES_USE_NPTL;
 	*retval = l->l_proc->p_pid;
 	return 0;
+}
 /* ARGUSED1 */
 int
 linux_sys_gettid(struct lwp *l, const void *v, register_t *retval)
+{
 	/* The Linux kernel does it exactly that way */
 	*retval = l->l_proc->p_pid;
 	return 0;
+}
 #ifdef LINUX_NPTL
 /* ARGUSED1 */
 int
 linux_sys_getpid(struct lwp *l, const void *v, register_t *retval)
+{
 	struct linux_emuldata *led = l->l_proc->p_emuldata;
 	if (led->s->flags & LINUX_LES_USE_NPTL) {
 		/* The Linux kernel does it exactly that way */
 		*retval = led->s->group_pid;
 	} else {
 		*retval = l->l_proc->p_pid;
+	}
 	return 0;
+}
 /* ARGUSED1 */
 int
 linux_sys_getppid(struct lwp *l, const void *v, register_t *retval)
+{
 	struct proc *p = l->l_proc;
 	struct linux_emuldata *led = p->p_emuldata;
 	struct proc *glp;
 	struct proc *pp;
 	mutex_enter(proc_lock);
 	if (led->s->flags & LINUX_LES_USE_NPTL) {
 		/* Find the thread group leader's parent */
 		if ((glp = p_find(led->s->group_pid, PFIND_LOCKED)) == NULL) {
 			/* Maybe panic... */
 			printf("linux_sys_getppid: missing group leader PID"
 			    " %d\n", led->s->group_pid);
 			mutex_exit(proc_lock);
 			return -1;
+		}
 		pp = glp->p_pptr;
 		/* If this is a Linux process too, return thread group PID */
 		if (pp->p_emul == p->p_emul) {
 			struct linux_emuldata *pled;
 			pled = pp->p_emuldata;
 			*retval = pled->s->group_pid;
 		} else {
 			*retval = pp->p_pid;
+		}
 	} else {
 		*retval = p->p_pptr->p_pid;
+	}
 	mutex_exit(proc_lock);
 	return 0;
+}
 #endif /* LINUX_NPTL */
 int
 linux_sys_sched_getaffinity(struct lwp *l, const struct linux_sys_sched_getaffinity_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(pid_t) pid;
 		syscallarg(unsigned int) len;
 		syscallarg(unsigned long *) mask;
 	} */
 	int error;
 	int ret;
 	char *data;
 	int *retp;
 	if (SCARG(uap, mask) == NULL)
 		return EINVAL;
 	if (SCARG(uap, len) < sizeof(int))
 		return EINVAL;
 	if (pfind(SCARG(uap, pid)) == NULL)
 		return ESRCH;
 	/*
 	 * return the actual number of CPU, tag all of them as available
 	 * The result is a mask, the first CPU being in the least significant
 	 * bit.
 	 */
 	ret = (1 << ncpu) - 1;
 	data = malloc(SCARG(uap, len), M_TEMP, M_WAITOK|M_ZERO);
 	retp = (int *)&data[SCARG(uap, len) - sizeof(ret)];
 	*retp = ret;
-	if ((error = copyout(data, SCARG(uap, mask), SCARG(uap, len))) != 0)
+	error = copyout(data, SCARG(uap, mask), SCARG(uap, len));
 		return error;
 	free(data, M_TEMP);
-	return 0;
+	return error;
+}
 int
 linux_sys_sched_setaffinity(struct lwp *l, const struct linux_sys_sched_setaffinity_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(pid_t) pid;
 		syscallarg(unsigned int) len;
 		syscallarg(unsigned long *) mask;
 	} */
 	if (pfind(SCARG(uap, pid)) == NULL)
 		return ESRCH;
 	/* Let's ignore it */
 #ifdef DEBUG_LINUX
 	printf("linux_sys_sched_setaffinity\n");
 #endif
 	return 0;
 };
 #endif /* LINUX_NPTL */