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NetBSD/sys/kern/kern_sa.c

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/* $NetBSD: kern_sa.c,v 1.87 2006/11/01 10:17:58 yamt Exp $ */
/*-
* Copyright (c) 2001, 2004, 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nathan J. Williams.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
#include <sys/cdefs.h>
#include "opt_ktrace.h"
#include "opt_multiprocessor.h"
__KERNEL_RCSID(0, "$NetBSD: kern_sa.c,v 1.87 2006/11/01 10:17:58 yamt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/types.h>
#include <sys/ucontext.h>
#include <sys/kmem.h>
#include <sys/mount.h>
#include <sys/sa.h>
#include <sys/savar.h>
#include <sys/syscallargs.h>
#include <sys/ktrace.h>
#include <uvm/uvm_extern.h>
static POOL_INIT(sadata_pool, sizeof(struct sadata), 0, 0, 0, "sadatapl",
&pool_allocator_nointr); /* memory pool for sadata structures */
static POOL_INIT(saupcall_pool, sizeof(struct sadata_upcall), 0, 0, 0,
"saupcpl", &pool_allocator_nointr); /* memory pool for pending upcalls */
static POOL_INIT(sastack_pool, sizeof(struct sastack), 0, 0, 0, "sastackpl",
&pool_allocator_nointr); /* memory pool for sastack structs */
static POOL_INIT(savp_pool, sizeof(struct sadata_vp), 0, 0, 0, "savppl",
&pool_allocator_nointr); /* memory pool for sadata_vp structures */
static struct sadata_vp *sa_newsavp(struct sadata *);
static inline int sa_stackused(struct sastack *, struct sadata *);
static inline void sa_setstackfree(struct sastack *, struct sadata *);
static struct sastack *sa_getstack(struct sadata *);
static inline struct sastack *sa_getstack0(struct sadata *);
static inline int sast_compare(struct sastack *, struct sastack *);
#ifdef MULTIPROCESSOR
static int sa_increaseconcurrency(struct lwp *, int);
#endif
static void sa_setwoken(struct lwp *);
static void sa_switchcall(void *);
static int sa_newcachelwp(struct lwp *);
static inline void sa_makeupcalls(struct lwp *);
static struct lwp *sa_vp_repossess(struct lwp *l);
static inline int sa_pagefault(struct lwp *, ucontext_t *);
static void sa_upcall0(struct sadata_upcall *, int, struct lwp *, struct lwp *,
size_t, void *, void (*)(void *));
static void sa_upcall_getstate(union sau_state *, struct lwp *);
#define SA_DEBUG
#ifdef SA_DEBUG
#define DPRINTF(x) do { if (sadebug) printf_nolog x; } while (0)
#define DPRINTFN(n,x) do { if (sadebug & (1<<(n-1))) printf_nolog x; } while (0)
int sadebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif
#define SA_LWP_STATE_LOCK(l, f) do { \
(f) = (l)->l_flag; \
(l)->l_flag &= ~L_SA; \
} while (/*CONSTCOND*/ 0)
#define SA_LWP_STATE_UNLOCK(l, f) do { \
(l)->l_flag |= (f) & L_SA; \
} while (/*CONSTCOND*/ 0)
SPLAY_PROTOTYPE(sasttree, sastack, sast_node, sast_compare);
SPLAY_GENERATE(sasttree, sastack, sast_node, sast_compare);
/*
* sadata_upcall_alloc:
*
* Allocate an sadata_upcall structure.
*/
struct sadata_upcall *
sadata_upcall_alloc(int waitok)
{
struct sadata_upcall *sau;
sau = pool_get(&saupcall_pool, waitok ? PR_WAITOK : PR_NOWAIT);
if (sau) {
sau->sau_arg = NULL;
}
return sau;
}
/*
* sadata_upcall_free:
*
* Free an sadata_upcall structure and any associated argument data.
*/
void
sadata_upcall_free(struct sadata_upcall *sau)
{
if (sau == NULL) {
return;
}
if (sau->sau_arg) {
(*sau->sau_argfreefunc)(sau->sau_arg);
}
pool_put(&saupcall_pool, sau);
}
static struct sadata_vp *
sa_newsavp(struct sadata *sa)
{
struct sadata_vp *vp, *qvp;
/* Allocate virtual processor data structure */
vp = pool_get(&savp_pool, PR_WAITOK);
/* Initialize. */
memset(vp, 0, sizeof(*vp));
simple_lock_init(&vp->savp_lock);
vp->savp_lwp = NULL;
vp->savp_wokenq_head = NULL;
vp->savp_faultaddr = 0;
vp->savp_ofaultaddr = 0;
LIST_INIT(&vp->savp_lwpcache);
vp->savp_ncached = 0;
SIMPLEQ_INIT(&vp->savp_upcalls);
simple_lock(&sa->sa_lock);
/* find first free savp_id and add vp to sorted slist */
if (SLIST_EMPTY(&sa->sa_vps) ||
SLIST_FIRST(&sa->sa_vps)->savp_id != 0) {
vp->savp_id = 0;
SLIST_INSERT_HEAD(&sa->sa_vps, vp, savp_next);
} else {
SLIST_FOREACH(qvp, &sa->sa_vps, savp_next) {
if (SLIST_NEXT(qvp, savp_next) == NULL ||
SLIST_NEXT(qvp, savp_next)->savp_id !=
qvp->savp_id + 1)
break;
}
vp->savp_id = qvp->savp_id + 1;
SLIST_INSERT_AFTER(qvp, vp, savp_next);
}
simple_unlock(&sa->sa_lock);
return (vp);
}
int
sys_sa_register(struct lwp *l, void *v, register_t *retval)
{
struct sys_sa_register_args /* {
syscallarg(sa_upcall_t) new;
syscallarg(sa_upcall_t *) old;
syscallarg(int) flags;
syscallarg(ssize_t) stackinfo_offset;
} */ *uap = v;
int error;
sa_upcall_t prev;
error = dosa_register(l, SCARG(uap, new), &prev, SCARG(uap, flags),
SCARG(uap, stackinfo_offset));
if (error)
return error;
if (SCARG(uap, old))
return copyout(&prev, SCARG(uap, old),
sizeof(prev));
return 0;
}
int
dosa_register(struct lwp *l, sa_upcall_t new, sa_upcall_t *prev, int flags,
ssize_t stackinfo_offset)
{
struct proc *p = l->l_proc;
struct sadata *sa;
if (p->p_sa == NULL) {
/* Allocate scheduler activations data structure */
sa = pool_get(&sadata_pool, PR_WAITOK);
/* Initialize. */
memset(sa, 0, sizeof(*sa));
simple_lock_init(&sa->sa_lock);
sa->sa_flag = flags & SA_FLAG_ALL;
sa->sa_maxconcurrency = 1;
sa->sa_concurrency = 1;
SPLAY_INIT(&sa->sa_stackstree);
sa->sa_stacknext = NULL;
if (flags & SA_FLAG_STACKINFO)
sa->sa_stackinfo_offset = stackinfo_offset;
else
sa->sa_stackinfo_offset = 0;
sa->sa_nstacks = 0;
SLIST_INIT(&sa->sa_vps);
p->p_sa = sa;
KASSERT(l->l_savp == NULL);
}
if (l->l_savp == NULL) {
l->l_savp = sa_newsavp(p->p_sa);
sa_newcachelwp(l);
}
*prev = p->p_sa->sa_upcall;
p->p_sa->sa_upcall = new;
return (0);
}
void
sa_release(struct proc *p)
{
struct sadata *sa;
struct sastack *sast, *next;
struct sadata_vp *vp;
struct lwp *l;
sa = p->p_sa;
KDASSERT(sa != NULL);
KASSERT(p->p_nlwps <= 1);
for (sast = SPLAY_MIN(sasttree, &sa->sa_stackstree); sast != NULL;
sast = next) {
next = SPLAY_NEXT(sasttree, &sa->sa_stackstree, sast);
SPLAY_REMOVE(sasttree, &sa->sa_stackstree, sast);
pool_put(&sastack_pool, sast);
}
p->p_flag &= ~P_SA;
while ((vp = SLIST_FIRST(&p->p_sa->sa_vps)) != NULL) {
SLIST_REMOVE_HEAD(&p->p_sa->sa_vps, savp_next);
pool_put(&savp_pool, vp);
}
pool_put(&sadata_pool, sa);
p->p_sa = NULL;
l = LIST_FIRST(&p->p_lwps);
if (l) {
KASSERT(LIST_NEXT(l, l_sibling) == NULL);
l->l_savp = NULL;
}
}
static int
sa_fetchstackgen(struct sastack *sast, struct sadata *sa, unsigned int *gen)
{
int error;
/* COMPAT_NETBSD32: believe it or not, but the following is ok */
error = copyin(&((struct sa_stackinfo_t *)
((char *)sast->sast_stack.ss_sp +
sa->sa_stackinfo_offset))->sasi_stackgen, gen, sizeof(*gen));
return error;
}
static inline int
sa_stackused(struct sastack *sast, struct sadata *sa)
{
unsigned int gen;
if (sa_fetchstackgen(sast, sa, &gen)) {
#ifdef DIAGNOSTIC
printf("sa_stackused: couldn't copyin sasi_stackgen");
#endif
sigexit(curlwp, SIGILL);
/* NOTREACHED */
}
return (sast->sast_gen != gen);
}
static inline void
sa_setstackfree(struct sastack *sast, struct sadata *sa)
{
unsigned int gen;
if (sa_fetchstackgen(sast, sa, &gen)) {
#ifdef DIAGNOSTIC
printf("sa_setstackfree: couldn't copyin sasi_stackgen");
#endif
sigexit(curlwp, SIGILL);
/* NOTREACHED */
}
sast->sast_gen = gen;
}
/*
* Find next free stack, starting at sa->sa_stacknext.
*/
static struct sastack *
sa_getstack(struct sadata *sa)
{
struct sastack *sast;
SCHED_ASSERT_UNLOCKED();
if ((sast = sa->sa_stacknext) == NULL || sa_stackused(sast, sa))
sast = sa_getstack0(sa);
if (sast == NULL)
return NULL;
sast->sast_gen++;
return sast;
}
static inline struct sastack *
sa_getstack0(struct sadata *sa)
{
struct sastack *start;
if (sa->sa_stacknext == NULL) {
sa->sa_stacknext = SPLAY_MIN(sasttree, &sa->sa_stackstree);
if (sa->sa_stacknext == NULL)
return NULL;
}
start = sa->sa_stacknext;
while (sa_stackused(sa->sa_stacknext, sa)) {
sa->sa_stacknext = SPLAY_NEXT(sasttree, &sa->sa_stackstree,
sa->sa_stacknext);
if (sa->sa_stacknext == NULL)
sa->sa_stacknext = SPLAY_MIN(sasttree,
&sa->sa_stackstree);
if (sa->sa_stacknext == start)
return NULL;
}
return sa->sa_stacknext;
}
static inline int
sast_compare(struct sastack *a, struct sastack *b)
{
if ((vaddr_t)a->sast_stack.ss_sp + a->sast_stack.ss_size <=
(vaddr_t)b->sast_stack.ss_sp)
return (-1);
if ((vaddr_t)a->sast_stack.ss_sp >=
(vaddr_t)b->sast_stack.ss_sp + b->sast_stack.ss_size)
return (1);
return (0);
}
static int
sa_copyin_stack(stack_t *stacks, int index, stack_t *dest)
{
return copyin(stacks + index, dest, sizeof(stack_t));
}
int
sys_sa_stacks(struct lwp *l, void *v, register_t *retval)
{
struct sys_sa_stacks_args /* {
syscallarg(int) num;
syscallarg(stack_t *) stacks;
} */ *uap = v;
return sa_stacks1(l, retval, SCARG(uap, num), SCARG(uap, stacks), sa_copyin_stack);
}
int
sa_stacks1(struct lwp *l, register_t *retval, int num, stack_t *stacks,
sa_copyin_stack_t do_sa_copyin_stack)
{
struct sadata *sa = l->l_proc->p_sa;
struct sastack *sast, newsast;
int count, error, f, i;
/* We have to be using scheduler activations */
if (sa == NULL)
return (EINVAL);
count = num;
if (count < 0)
return (EINVAL);
SA_LWP_STATE_LOCK(l, f);
error = 0;
for (i = 0; i < count; i++) {
error = do_sa_copyin_stack(stacks, i, &newsast.sast_stack);
if (error) {
count = i;
break;
}
sast = SPLAY_FIND(sasttree, &sa->sa_stackstree, &newsast);
if (sast != NULL) {
DPRINTFN(9, ("sa_stacks(%d.%d) returning stack %p\n",
l->l_proc->p_pid, l->l_lid,
newsast.sast_stack.ss_sp));
if (sa_stackused(sast, sa) == 0) {
count = i;
error = EEXIST;
break;
}
} else if (sa->sa_nstacks >=
SA_MAXNUMSTACKS * sa->sa_concurrency) {
DPRINTFN(9,
("sa_stacks(%d.%d) already using %d stacks\n",
l->l_proc->p_pid, l->l_lid,
SA_MAXNUMSTACKS * sa->sa_concurrency));
count = i;
error = ENOMEM;
break;
} else {
DPRINTFN(9, ("sa_stacks(%d.%d) adding stack %p\n",
l->l_proc->p_pid, l->l_lid,
newsast.sast_stack.ss_sp));
sast = pool_get(&sastack_pool, PR_WAITOK);
sast->sast_stack = newsast.sast_stack;
SPLAY_INSERT(sasttree, &sa->sa_stackstree, sast);
sa->sa_nstacks++;
}
sa_setstackfree(sast, sa);
}
SA_LWP_STATE_UNLOCK(l, f);
*retval = count;
return (error);
}
int
sys_sa_enable(struct lwp *l, void *v, register_t *retval)
{
struct proc *p = l->l_proc;
struct sadata *sa = p->p_sa;
struct sadata_vp *vp = l->l_savp;
int error;
DPRINTF(("sys_sa_enable(%d.%d)\n", l->l_proc->p_pid,
l->l_lid));
/* We have to be using scheduler activations */
if (sa == NULL || vp == NULL)
return (EINVAL);
if (p->p_flag & P_SA) /* Already running! */
return (EBUSY);
error = sa_upcall(l, SA_UPCALL_NEWPROC, l, NULL, 0, NULL, NULL);
if (error)
return (error);
/* Assign this LWP to the virtual processor */
vp->savp_lwp = l;
p->p_flag |= P_SA;
l->l_flag |= L_SA; /* We are now an activation LWP */
/* This will not return to the place in user space it came from. */
return (0);
}
#ifdef MULTIPROCESSOR
static int
sa_increaseconcurrency(struct lwp *l, int concurrency)
{
struct proc *p;
struct lwp *l2;
struct sadata *sa;
vaddr_t uaddr;
boolean_t inmem;
int addedconcurrency, error, s;
p = l->l_proc;
sa = p->p_sa;
addedconcurrency = 0;
simple_lock(&sa->sa_lock);
while (sa->sa_maxconcurrency < concurrency) {
sa->sa_maxconcurrency++;
sa->sa_concurrency++;
simple_unlock(&sa->sa_lock);
inmem = uvm_uarea_alloc(&uaddr);
if (__predict_false(uaddr == 0)) {
/* reset concurrency */
simple_lock(&sa->sa_lock);
sa->sa_maxconcurrency--;
sa->sa_concurrency--;
simple_unlock(&sa->sa_lock);
return (addedconcurrency);
} else {
newlwp(l, p, uaddr, inmem, 0, NULL, 0,
child_return, 0, &l2);
l2->l_flag |= L_SA;
l2->l_savp = sa_newsavp(sa);
if (l2->l_savp) {
l2->l_savp->savp_lwp = l2;
cpu_setfunc(l2, sa_switchcall, NULL);
error = sa_upcall(l2, SA_UPCALL_NEWPROC,
NULL, NULL, 0, NULL, NULL);
if (error) {
/* free new savp */
SLIST_REMOVE(&sa->sa_vps, l2->l_savp,
sadata_vp, savp_next);
pool_put(&savp_pool, l2->l_savp);
}
} else
error = 1;
if (error) {
/* put l2 into l's LWP cache */
l2->l_savp = l->l_savp;
PHOLD(l2);
SCHED_LOCK(s);
sa_putcachelwp(p, l2);
SCHED_UNLOCK(s);
/* reset concurrency */
simple_lock(&sa->sa_lock);
sa->sa_maxconcurrency--;
sa->sa_concurrency--;
simple_unlock(&sa->sa_lock);
return (addedconcurrency);
}
SCHED_LOCK(s);
setrunnable(l2);
SCHED_UNLOCK(s);
addedconcurrency++;
}
simple_lock(&sa->sa_lock);
}
simple_unlock(&sa->sa_lock);
return (addedconcurrency);
}
#endif
int
sys_sa_setconcurrency(struct lwp *l, void *v, register_t *retval)
{
struct sys_sa_setconcurrency_args /* {
syscallarg(int) concurrency;
} */ *uap = v;
struct sadata *sa = l->l_proc->p_sa;
#ifdef MULTIPROCESSOR
struct sadata_vp *vp = l->l_savp;
int ncpus, s;
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;
#endif
DPRINTFN(11,("sys_sa_concurrency(%d.%d)\n", l->l_proc->p_pid,
l->l_lid));
/* We have to be using scheduler activations */
if (sa == NULL)
return (EINVAL);
if ((l->l_proc->p_flag & P_SA) == 0)
return (EINVAL);
if (SCARG(uap, concurrency) < 1)
return (EINVAL);
*retval = 0;
/*
* Concurrency greater than the number of physical CPUs does
* not make sense.
* XXX Should we ever support hot-plug CPUs, this will need
* adjustment.
*/
#ifdef MULTIPROCESSOR
if (SCARG(uap, concurrency) > sa->sa_maxconcurrency) {
ncpus = 0;
for (CPU_INFO_FOREACH(cii, ci))
ncpus++;
*retval += sa_increaseconcurrency(l,
min(SCARG(uap, concurrency), ncpus));
}
#endif
DPRINTFN(11,("sys_sa_concurrency(%d.%d) want %d, have %d, max %d\n",
l->l_proc->p_pid, l->l_lid, SCARG(uap, concurrency),
sa->sa_concurrency, sa->sa_maxconcurrency));
#ifdef MULTIPROCESSOR
if (SCARG(uap, concurrency) > sa->sa_concurrency) {
SCHED_LOCK(s);
SLIST_FOREACH(vp, &sa->sa_vps, savp_next) {
if (vp->savp_lwp->l_flag & L_SA_IDLE) {
vp->savp_lwp->l_flag &=
~(L_SA_IDLE|L_SA_YIELD|L_SINTR);
SCHED_UNLOCK(s);
DPRINTFN(11,("sys_sa_concurrency(%d.%d) "
"NEWPROC vp %d\n",
l->l_proc->p_pid, l->l_lid,
vp->savp_id));
cpu_setfunc(vp->savp_lwp, sa_switchcall, NULL);
/* error = */ sa_upcall(vp->savp_lwp,
SA_UPCALL_NEWPROC,
NULL, NULL, 0, NULL, NULL);
SCHED_LOCK(s);
sa->sa_concurrency++;
setrunnable(vp->savp_lwp);
KDASSERT((vp->savp_lwp->l_flag & L_SINTR) == 0);
(*retval)++;
}
if (sa->sa_concurrency == SCARG(uap, concurrency))
break;
}
SCHED_UNLOCK(s);
}
#endif
return (0);
}
int
sys_sa_yield(struct lwp *l, void *v, register_t *retval)
{
struct proc *p = l->l_proc;
if (p->p_sa == NULL || !(p->p_flag & P_SA)) {
DPRINTFN(1,
("sys_sa_yield(%d.%d) proc %p not SA (p_sa %p, flag %s)\n",
p->p_pid, l->l_lid, p, p->p_sa,
p->p_flag & P_SA ? "T" : "F"));
return (EINVAL);
}
sa_yield(l);
return (EJUSTRETURN);
}
void
sa_yield(struct lwp *l)
{
struct proc *p = l->l_proc;
struct sadata *sa = p->p_sa;
struct sadata_vp *vp = l->l_savp;
int ret;
KERNEL_LOCK_ASSERT_LOCKED();
if (vp->savp_lwp != l) {
/*
* We lost the VP on our way here, this happens for
* instance when we sleep in systrace. This will end
* in an SA_UNBLOCKED_UPCALL in sa_setwoken().
*/
DPRINTFN(1,("sa_yield(%d.%d) lost VP\n",
p->p_pid, l->l_lid));
KDASSERT(l->l_flag & L_SA_BLOCKING);
return;
}
/*
* If we're the last running LWP, stick around to receive
* signals.
*/
KDASSERT((l->l_flag & L_SA_YIELD) == 0);
DPRINTFN(1,("sa_yield(%d.%d) going dormant\n",
p->p_pid, l->l_lid));
/*
* A signal will probably wake us up. Worst case, the upcall
* happens and just causes the process to yield again.
*/
/* s = splsched(); */ /* Protect from timer expirations */
KDASSERT(vp->savp_lwp == l);
/*
* If we were told to make an upcall or exit before
* the splsched(), make sure we process it instead of
* going to sleep. It might make more sense for this to
* be handled inside of tsleep....
*/
ret = 0;
l->l_flag |= L_SA_YIELD;
if (l->l_flag & L_SA_UPCALL) {
/* KERNEL_PROC_UNLOCK(l); in upcallret() */
upcallret(l);
KERNEL_PROC_LOCK(l);
}
while (l->l_flag & L_SA_YIELD) {
DPRINTFN(1,("sa_yield(%d.%d) really going dormant\n",
p->p_pid, l->l_lid));
simple_lock(&sa->sa_lock);
sa->sa_concurrency--;
simple_unlock(&sa->sa_lock);
ret = tsleep(l, PUSER | PCATCH, "sawait", 0);
simple_lock(&sa->sa_lock);
sa->sa_concurrency++;
simple_unlock(&sa->sa_lock);
KDASSERT(vp->savp_lwp == l || p->p_flag & P_WEXIT);
/* KERNEL_PROC_UNLOCK(l); in upcallret() */
upcallret(l);
KERNEL_PROC_LOCK(l);
}
/* splx(s); */
DPRINTFN(1,("sa_yield(%d.%d) returned, ret %d, userret %p\n",
p->p_pid, l->l_lid, ret, p->p_userret));
}
int
sys_sa_preempt(struct lwp *l, void *v, register_t *retval)
{
/* XXX Implement me. */
return (ENOSYS);
}
/* XXX Hm, naming collision. */
void
sa_preempt(struct lwp *l)
{
struct proc *p = l->l_proc;
struct sadata *sa = p->p_sa;
/*
* Defer saving the lwp's state because on some ports
* preemption can occur between generating an unblocked upcall
* and processing the upcall queue.
*/
if (sa->sa_flag & SA_FLAG_PREEMPT)
sa_upcall(l, SA_UPCALL_PREEMPTED | SA_UPCALL_DEFER_EVENT,
l, NULL, 0, NULL, NULL);
}
/*
* Set up the user-level stack and trapframe to do an upcall.
*
* NOTE: This routine WILL FREE "arg" in the case of failure! Callers
* should not touch the "arg" pointer once calling sa_upcall().
*/
int
sa_upcall(struct lwp *l, int type, struct lwp *event, struct lwp *interrupted,
size_t argsize, void *arg, void (*func)(void *))
{
struct sadata_upcall *sau;
struct sadata *sa = l->l_proc->p_sa;
struct sadata_vp *vp = l->l_savp;
struct sastack *sast;
int f, error;
/* XXX prevent recursive upcalls if we sleep for memory */
SA_LWP_STATE_LOCK(l, f);
sast = sa_getstack(sa);
SA_LWP_STATE_UNLOCK(l, f);
if (sast == NULL) {
return (ENOMEM);
}
DPRINTFN(9,("sa_upcall(%d.%d) using stack %p\n",
l->l_proc->p_pid, l->l_lid, sast->sast_stack.ss_sp));
if (l->l_proc->p_emul->e_sa->sae_upcallconv) {
error = (*l->l_proc->p_emul->e_sa->sae_upcallconv)(l, type,
&argsize, &arg, &func);
if (error)
return error;
}
SA_LWP_STATE_LOCK(l, f);
sau = sadata_upcall_alloc(1);
SA_LWP_STATE_UNLOCK(l, f);
sa_upcall0(sau, type, event, interrupted, argsize, arg, func);
sau->sau_stack = sast->sast_stack;
SIMPLEQ_INSERT_TAIL(&vp->savp_upcalls, sau, sau_next);
l->l_flag |= L_SA_UPCALL;
return (0);
}
static void
sa_upcall0(struct sadata_upcall *sau, int type, struct lwp *event,
struct lwp *interrupted, size_t argsize, void *arg, void (*func)(void *))
{
KDASSERT((event == NULL) || (event != interrupted));
sau->sau_flags = 0;
if (type & SA_UPCALL_DEFER_EVENT) {
sau->sau_event.ss_deferred.ss_lwp = event;
sau->sau_flags |= SAU_FLAG_DEFERRED_EVENT;
} else
sa_upcall_getstate(&sau->sau_event, event);
if (type & SA_UPCALL_DEFER_INTERRUPTED) {
sau->sau_interrupted.ss_deferred.ss_lwp = interrupted;
sau->sau_flags |= SAU_FLAG_DEFERRED_INTERRUPTED;
} else
sa_upcall_getstate(&sau->sau_interrupted, interrupted);
sau->sau_type = type & SA_UPCALL_TYPE_MASK;
sau->sau_argsize = argsize;
sau->sau_arg = arg;
sau->sau_argfreefunc = func;
}
void *
sa_ucsp(void *arg)
{
ucontext_t *uc = arg;
return (void *)(uintptr_t)_UC_MACHINE_SP(uc);
}
static void
sa_upcall_getstate(union sau_state *ss, struct lwp *l)
{
caddr_t sp;
size_t ucsize;
if (l) {
l->l_flag |= L_SA_SWITCHING;
(*l->l_proc->p_emul->e_sa->sae_getucontext)(l,
(void *)&ss->ss_captured.ss_ctx);
l->l_flag &= ~L_SA_SWITCHING;
sp = (*l->l_proc->p_emul->e_sa->sae_ucsp)
(&ss->ss_captured.ss_ctx);
/* XXX COMPAT_NETBSD32: _UC_UCONTEXT_ALIGN */
sp = STACK_ALIGN(sp, ~_UC_UCONTEXT_ALIGN);
ucsize = roundup(l->l_proc->p_emul->e_sa->sae_ucsize,
(~_UC_UCONTEXT_ALIGN) + 1);
ss->ss_captured.ss_sa.sa_context =
(ucontext_t *)STACK_ALLOC(sp, ucsize);
ss->ss_captured.ss_sa.sa_id = l->l_lid;
ss->ss_captured.ss_sa.sa_cpu = l->l_savp->savp_id;
} else
ss->ss_captured.ss_sa.sa_context = NULL;
}
/*
* Detect double pagefaults and pagefaults on upcalls.
* - double pagefaults are detected by comparing the previous faultaddr
* against the current faultaddr
* - pagefaults on upcalls are detected by checking if the userspace
* thread is running on an upcall stack
*/
static inline int
sa_pagefault(struct lwp *l, ucontext_t *l_ctx)
{
struct proc *p;
struct sadata *sa;
struct sadata_vp *vp;
struct sastack sast;
p = l->l_proc;
sa = p->p_sa;
vp = l->l_savp;
KDASSERT(vp->savp_lwp == l);
if (vp->savp_faultaddr == vp->savp_ofaultaddr) {
DPRINTFN(10,("sa_pagefault(%d.%d) double page fault\n",
p->p_pid, l->l_lid));
return 1;
}
sast.sast_stack.ss_sp = (*p->p_emul->e_sa->sae_ucsp)(l_ctx);
sast.sast_stack.ss_size = 1;
if (SPLAY_FIND(sasttree, &sa->sa_stackstree, &sast)) {
DPRINTFN(10,("sa_pagefault(%d.%d) upcall page fault\n",
p->p_pid, l->l_lid));
return 1;
}
vp->savp_ofaultaddr = vp->savp_faultaddr;
return 0;
}
/*
* Called by tsleep(). Block current LWP and switch to another.
*
* WE ARE NOT ALLOWED TO SLEEP HERE! WE ARE CALLED FROM WITHIN
* TSLEEP() ITSELF! We are called with sched_lock held, and must
* hold it right through the mi_switch() call.
*/
void
sa_switch(struct lwp *l, struct sadata_upcall *sau, int type)
{
struct proc *p = l->l_proc;
struct sadata_vp *vp = l->l_savp;
struct lwp *l2;
struct sadata_upcall *freesau = NULL;
int s;
DPRINTFN(4,("sa_switch(%d.%d type %d VP %d)\n", p->p_pid, l->l_lid,
type, vp->savp_lwp ? vp->savp_lwp->l_lid : 0));
SCHED_ASSERT_LOCKED();
if (p->p_flag & P_WEXIT) {
mi_switch(l, NULL);
sadata_upcall_free(sau);
return;
}
if (l->l_flag & L_SA_YIELD) {
/*
* Case 0: we're blocking in sa_yield
*/
if (vp->savp_wokenq_head == NULL && p->p_userret == NULL) {
l->l_flag |= L_SA_IDLE;
mi_switch(l, NULL);
} else {
/* make us running again. */
unsleep(l);
l->l_stat = LSONPROC;
l->l_proc->p_nrlwps++;
s = splsched();
SCHED_UNLOCK(s);
}
sadata_upcall_free(sau);
return;
} else if (vp->savp_lwp == l) {
/*
* Case 1: we're blocking for the first time; generate
* a SA_BLOCKED upcall and allocate resources for the
* UNBLOCKED upcall.
*/
if (sau == NULL) {
#ifdef DIAGNOSTIC
printf("sa_switch(%d.%d): no upcall data.\n",
p->p_pid, l->l_lid);
#endif
mi_switch(l, NULL);
return;
}
/*
* The process of allocating a new LWP could cause
* sleeps. We're called from inside sleep, so that
* would be Bad. Therefore, we must use a cached new
* LWP. The first thing that this new LWP must do is
* allocate another LWP for the cache. */
l2 = sa_getcachelwp(vp);
if (l2 == NULL) {
/* XXXSMP */
/* No upcall for you! */
/* XXX The consequences of this are more subtle and
* XXX the recovery from this situation deserves
* XXX more thought.
*/
/* XXXUPSXXX Should only happen with concurrency > 1 */
#ifdef DIAGNOSTIC
printf("sa_switch(%d.%d): no cached LWP for upcall.\n",
p->p_pid, l->l_lid);
#endif
mi_switch(l, NULL);
sadata_upcall_free(sau);
return;
}
cpu_setfunc(l2, sa_switchcall, sau);
sa_upcall0(sau, SA_UPCALL_BLOCKED, l, NULL, 0, NULL, NULL);
/*
* Perform the double/upcall pagefault check.
* We do this only here since we need l's ucontext to
* get l's userspace stack. sa_upcall0 above has saved
* it for us.
* The L_SA_PAGEFAULT flag is set in the MD
* pagefault code to indicate a pagefault. The MD
* pagefault code also saves the faultaddr for us.
*/
if ((l->l_flag & L_SA_PAGEFAULT) && sa_pagefault(l,
&sau->sau_event.ss_captured.ss_ctx) != 0) {
cpu_setfunc(l2, sa_switchcall, NULL);
sa_putcachelwp(p, l2); /* PHOLD from sa_getcachelwp */
mi_switch(l, NULL);
sadata_upcall_free(sau);
DPRINTFN(10,("sa_switch(%d.%d) page fault resolved\n",
p->p_pid, l->l_lid));
if (vp->savp_faultaddr == vp->savp_ofaultaddr)
vp->savp_ofaultaddr = -1;
return;
}
DPRINTFN(8,("sa_switch(%d.%d) blocked upcall %d\n",
p->p_pid, l->l_lid, l2->l_lid));
l->l_flag |= L_SA_BLOCKING;
l2->l_priority = l2->l_usrpri;
vp->savp_blocker = l;
vp->savp_lwp = l2;
setrunnable(l2);
PRELE(l2); /* Remove the artificial hold-count */
KDASSERT(l2 != l);
} else if (vp->savp_lwp != NULL) {
/*
* Case 2: We've been woken up while another LWP was
* on the VP, but we're going back to sleep without
* having returned to userland and delivering the
* SA_UNBLOCKED upcall (select and poll cause this
* kind of behavior a lot).
*/
freesau = sau;
l2 = NULL;
} else {
/* NOTREACHED */
panic("sa_vp empty");
}
DPRINTFN(4,("sa_switch(%d.%d) switching to LWP %d.\n",
p->p_pid, l->l_lid, l2 ? l2->l_lid : 0));
mi_switch(l, l2);
sadata_upcall_free(freesau);
DPRINTFN(4,("sa_switch(%d.%d flag %x) returned.\n",
p->p_pid, l->l_lid, l->l_flag));
KDASSERT(l->l_wchan == 0);
SCHED_ASSERT_UNLOCKED();
}
static void
sa_switchcall(void *arg)
{
struct lwp *l, *l2;
struct proc *p;
struct sadata_vp *vp;
struct sadata_upcall *sau;
struct sastack *sast;
int s;
l2 = curlwp;
p = l2->l_proc;
vp = l2->l_savp;
sau = arg;
if (p->p_flag & P_WEXIT) {
sadata_upcall_free(sau);
lwp_exit(l2);
}
KDASSERT(vp->savp_lwp == l2);
DPRINTFN(6,("sa_switchcall(%d.%d)\n", p->p_pid, l2->l_lid));
l2->l_flag &= ~L_SA;
if (LIST_EMPTY(&vp->savp_lwpcache)) {
/* Allocate the next cache LWP */
DPRINTFN(6,("sa_switchcall(%d.%d) allocating LWP\n",
p->p_pid, l2->l_lid));
sa_newcachelwp(l2);
}
if (sau) {
l = vp->savp_blocker;
sast = sa_getstack(p->p_sa);
if (sast) {
sau->sau_stack = sast->sast_stack;
SIMPLEQ_INSERT_TAIL(&vp->savp_upcalls, sau, sau_next);
l2->l_flag |= L_SA_UPCALL;
} else {
#ifdef DIAGNOSTIC
printf("sa_switchcall(%d.%d flag %x): Not enough stacks.\n",
p->p_pid, l->l_lid, l->l_flag);
#endif
sadata_upcall_free(sau);
PHOLD(l2);
SCHED_LOCK(s);
sa_putcachelwp(p, l2); /* sets L_SA */
vp->savp_lwp = l;
l->l_flag &= ~L_SA_BLOCKING;
p->p_nrlwps--;
mi_switch(l2, NULL);
/* mostly NOTREACHED */
SCHED_ASSERT_UNLOCKED();
splx(s);
}
}
l2->l_flag |= L_SA;
upcallret(l2);
}
static int
sa_newcachelwp(struct lwp *l)
{
struct proc *p;
struct lwp *l2;
vaddr_t uaddr;
boolean_t inmem;
int s;
p = l->l_proc;
if (p->p_flag & P_WEXIT)
return (0);
inmem = uvm_uarea_alloc(&uaddr);
if (__predict_false(uaddr == 0)) {
return (ENOMEM);
} else {
newlwp(l, p, uaddr, inmem, 0, NULL, 0, child_return, 0, &l2);
/* We don't want this LWP on the process's main LWP list, but
* newlwp helpfully puts it there. Unclear if newlwp should
* be tweaked.
*/
PHOLD(l2);
SCHED_LOCK(s);
l2->l_savp = l->l_savp;
sa_putcachelwp(p, l2);
SCHED_UNLOCK(s);
}
return (0);
}
/*
* Take a normal process LWP and place it in the SA cache.
* LWP must not be running!
*/
void
sa_putcachelwp(struct proc *p, struct lwp *l)
{
struct sadata_vp *vp;
SCHED_ASSERT_LOCKED();
vp = l->l_savp;
LIST_REMOVE(l, l_sibling);
p->p_nlwps--;
l->l_stat = LSSUSPENDED;
l->l_flag |= (L_DETACHED | L_SA);
/* XXX lock sadata */
DPRINTFN(5,("sa_putcachelwp(%d.%d) Adding LWP %d to cache\n",
p->p_pid, curlwp->l_lid, l->l_lid));
LIST_INSERT_HEAD(&vp->savp_lwpcache, l, l_sibling);
vp->savp_ncached++;
/* XXX unlock */
}
/*
* Fetch a LWP from the cache.
*/
struct lwp *
sa_getcachelwp(struct sadata_vp *vp)
{
struct lwp *l;
struct proc *p;
SCHED_ASSERT_LOCKED();
l = NULL;
/* XXX lock sadata */
if (vp->savp_ncached > 0) {
vp->savp_ncached--;
l = LIST_FIRST(&vp->savp_lwpcache);
LIST_REMOVE(l, l_sibling);
p = l->l_proc;
LIST_INSERT_HEAD(&p->p_lwps, l, l_sibling);
p->p_nlwps++;
DPRINTFN(5,("sa_getcachelwp(%d.%d) Got LWP %d from cache.\n",
p->p_pid, curlwp->l_lid, l->l_lid));
}
/* XXX unlock */
return l;
}
void
sa_unblock_userret(struct lwp *l)
{
struct proc *p;
struct lwp *l2;
struct sadata *sa;
struct sadata_vp *vp;
struct sadata_upcall *sau;
struct sastack *sast;
int f, s;
p = l->l_proc;
sa = p->p_sa;
vp = l->l_savp;
if (p->p_flag & P_WEXIT)
return;
SCHED_ASSERT_UNLOCKED();
KERNEL_PROC_LOCK(l);
SA_LWP_STATE_LOCK(l, f);
DPRINTFN(7,("sa_unblock_userret(%d.%d %x) \n", p->p_pid, l->l_lid,
l->l_flag));
sa_setwoken(l);
/* maybe NOTREACHED */
SCHED_LOCK(s);
if (l != vp->savp_lwp) {
/* Invoke an "unblocked" upcall */
DPRINTFN(8,("sa_unblock_userret(%d.%d) unblocking\n",
p->p_pid, l->l_lid));
l2 = sa_vp_repossess(l);
SCHED_UNLOCK(s);
if (l2 == NULL)
lwp_exit(l);
sast = sa_getstack(sa);
if (p->p_flag & P_WEXIT)
lwp_exit(l);
sau = sadata_upcall_alloc(1);
if (p->p_flag & P_WEXIT) {
sadata_upcall_free(sau);
lwp_exit(l);
}
KDASSERT(l2 != NULL);
PHOLD(l2);
KDASSERT(sast != NULL);
DPRINTFN(9,("sa_unblock_userret(%d.%d) using stack %p\n",
l->l_proc->p_pid, l->l_lid, sast->sast_stack.ss_sp));
/*
* Defer saving the event lwp's state because a
* PREEMPT upcall could be on the queue already.
*/
sa_upcall0(sau, SA_UPCALL_UNBLOCKED | SA_UPCALL_DEFER_EVENT,
l, l2, 0, NULL, NULL);
sau->sau_stack = sast->sast_stack;
SCHED_LOCK(s);
SIMPLEQ_INSERT_TAIL(&vp->savp_upcalls, sau, sau_next);
l->l_flag |= L_SA_UPCALL;
l->l_flag &= ~L_SA_BLOCKING;
sa_putcachelwp(p, l2);
}
SCHED_UNLOCK(s);
SA_LWP_STATE_UNLOCK(l, f);
KERNEL_PROC_UNLOCK(l);
}
void
sa_upcall_userret(struct lwp *l)
{
struct lwp *l2;
struct proc *p;
struct sadata *sa;
struct sadata_vp *vp;
struct sadata_upcall *sau;
struct sastack *sast;
int f, s;
p = l->l_proc;
sa = p->p_sa;
vp = l->l_savp;
SCHED_ASSERT_UNLOCKED();
KERNEL_PROC_LOCK(l);
SA_LWP_STATE_LOCK(l, f);
DPRINTFN(7,("sa_upcall_userret(%d.%d %x) \n", p->p_pid, l->l_lid,
l->l_flag));
KDASSERT((l->l_flag & L_SA_BLOCKING) == 0);
sast = NULL;
if (SIMPLEQ_EMPTY(&vp->savp_upcalls) && vp->savp_wokenq_head != NULL) {
sast = sa_getstack(sa);
if (sast == NULL) {
SA_LWP_STATE_UNLOCK(l, f);
KERNEL_PROC_UNLOCK(l);
preempt(1);
return;
}
}
SCHED_LOCK(s);
if (SIMPLEQ_EMPTY(&vp->savp_upcalls) && vp->savp_wokenq_head != NULL &&
sast != NULL) {
/* Invoke an "unblocked" upcall */
l2 = vp->savp_wokenq_head;
vp->savp_wokenq_head = l2->l_forw;
DPRINTFN(9,("sa_upcall_userret(%d.%d) using stack %p\n",
l->l_proc->p_pid, l->l_lid, sast->sast_stack.ss_sp));
SCHED_UNLOCK(s);
if (p->p_flag & P_WEXIT)
lwp_exit(l);
DPRINTFN(8,("sa_upcall_userret(%d.%d) unblocking %d\n",
p->p_pid, l->l_lid, l2->l_lid));
sau = sadata_upcall_alloc(1);
if (p->p_flag & P_WEXIT) {
sadata_upcall_free(sau);
lwp_exit(l);
}
sa_upcall0(sau, SA_UPCALL_UNBLOCKED, l2, l, 0, NULL, NULL);
sau->sau_stack = sast->sast_stack;
SIMPLEQ_INSERT_TAIL(&vp->savp_upcalls, sau, sau_next);
l2->l_flag &= ~L_SA_BLOCKING;
SCHED_LOCK(s);
sa_putcachelwp(p, l2); /* PHOLD from sa_setwoken */
SCHED_UNLOCK(s);
} else {
SCHED_UNLOCK(s);
if (sast)
sa_setstackfree(sast, sa);
}
KDASSERT(vp->savp_lwp == l);
while (!SIMPLEQ_EMPTY(&vp->savp_upcalls))
sa_makeupcalls(l);
if (vp->savp_wokenq_head == NULL)
l->l_flag &= ~L_SA_UPCALL;
SA_LWP_STATE_UNLOCK(l, f);
KERNEL_PROC_UNLOCK(l);
return;
}
#define SACOPYOUT(sae, type, kp, up) \
(((sae)->sae_sacopyout != NULL) ? \
(*(sae)->sae_sacopyout)((type), (kp), (void *)(up)) : \
copyout((kp), (void *)(up), sizeof(*(kp))))
static inline void
sa_makeupcalls(struct lwp *l)
{
struct lwp *l2, *eventq;
struct proc *p;
const struct sa_emul *sae;
struct sadata *sa;
struct sadata_vp *vp;
uintptr_t sapp, sap;
struct sa_t self_sa;
struct sa_t *sas[3];
struct sadata_upcall *sau;
void *stack, *ap;
union sau_state *e_ss;
ucontext_t *kup, *up;
size_t sz, ucsize;
int i, nint, nevents, s, type, error;
p = l->l_proc;
sae = p->p_emul->e_sa;
sa = p->p_sa;
vp = l->l_savp;
ucsize = sae->sae_ucsize;
sau = SIMPLEQ_FIRST(&vp->savp_upcalls);
SIMPLEQ_REMOVE_HEAD(&vp->savp_upcalls, sau_next);
if (sau->sau_flags & SAU_FLAG_DEFERRED_EVENT)
sa_upcall_getstate(&sau->sau_event,
sau->sau_event.ss_deferred.ss_lwp);
if (sau->sau_flags & SAU_FLAG_DEFERRED_INTERRUPTED)
sa_upcall_getstate(&sau->sau_interrupted,
sau->sau_interrupted.ss_deferred.ss_lwp);
#ifdef __MACHINE_STACK_GROWS_UP
stack = sau->sau_stack.ss_sp;
#else
stack = (caddr_t)sau->sau_stack.ss_sp + sau->sau_stack.ss_size;
#endif
stack = STACK_ALIGN(stack, ALIGNBYTES);
self_sa.sa_id = l->l_lid;
self_sa.sa_cpu = vp->savp_id;
sas[0] = &self_sa;
nevents = 0;
nint = 0;
if (sau->sau_event.ss_captured.ss_sa.sa_context != NULL) {
if (copyout(&sau->sau_event.ss_captured.ss_ctx,
sau->sau_event.ss_captured.ss_sa.sa_context,
ucsize) != 0) {
#ifdef DIAGNOSTIC
printf("sa_makeupcalls(%d.%d): couldn't copyout"
" context of event LWP %d\n",
p->p_pid, l->l_lid,
sau->sau_event.ss_captured.ss_sa.sa_id);
#endif
sigexit(l, SIGILL);
/* NOTREACHED */
}
sas[1] = &sau->sau_event.ss_captured.ss_sa;
nevents = 1;
}
if (sau->sau_interrupted.ss_captured.ss_sa.sa_context != NULL) {
KDASSERT(sau->sau_interrupted.ss_captured.ss_sa.sa_context !=
sau->sau_event.ss_captured.ss_sa.sa_context);
if (copyout(&sau->sau_interrupted.ss_captured.ss_ctx,
sau->sau_interrupted.ss_captured.ss_sa.sa_context,
ucsize) != 0) {
#ifdef DIAGNOSTIC
printf("sa_makeupcalls(%d.%d): couldn't copyout"
" context of interrupted LWP %d\n",
p->p_pid, l->l_lid,
sau->sau_interrupted.ss_captured.ss_sa.sa_id);
#endif
sigexit(l, SIGILL);
/* NOTREACHED */
}
sas[2] = &sau->sau_interrupted.ss_captured.ss_sa;
nint = 1;
}
eventq = NULL;
if (sau->sau_type == SA_UPCALL_UNBLOCKED) {
SCHED_LOCK(s);
eventq = vp->savp_wokenq_head;
vp->savp_wokenq_head = NULL;
SCHED_UNLOCK(s);
l2 = eventq;
while (l2 != NULL) {
nevents++;
l2 = l2->l_forw;
}
}
/* Copy out the activation's ucontext */
up = (void *)STACK_ALLOC(stack, ucsize);
stack = STACK_GROW(stack, ucsize);
kup = kmem_zalloc(sizeof(*kup), KM_SLEEP);
kup->uc_stack = sau->sau_stack;
kup->uc_flags = _UC_STACK;
error = SACOPYOUT(sae, SAOUT_UCONTEXT, kup, up);
kmem_free(kup, sizeof(*kup));
if (error) {
sadata_upcall_free(sau);
#ifdef DIAGNOSTIC
printf("sa_makeupcalls: couldn't copyout activation"
" ucontext for %d.%d to %p\n", l->l_proc->p_pid, l->l_lid,
up);
#endif
sigexit(l, SIGILL);
/* NOTREACHED */
}
sas[0]->sa_context = up;
/* Next, copy out the sa_t's and pointers to them. */
sz = (1 + nevents + nint) * sae->sae_sasize;
sap = (uintptr_t)STACK_ALLOC(stack, sz);
sap += sz;
stack = STACK_GROW(stack, sz);
sz = (1 + nevents + nint) * sae->sae_sapsize;
sapp = (uintptr_t)STACK_ALLOC(stack, sz);
sapp += sz;
stack = STACK_GROW(stack, sz);
KDASSERT(nint <= 1);
e_ss = NULL;
for (i = nevents + nint; i >= 0; i--) {
struct sa_t *sasp;
sap -= sae->sae_sasize;
sapp -= sae->sae_sapsize;
error = 0;
if (i == 1 + nevents) /* interrupted sa */
sasp = sas[2];
else if (i <= 1) /* self_sa and event sa */
sasp = sas[i];
else { /* extra sas */
KDASSERT(sau->sau_type == SA_UPCALL_UNBLOCKED);
KDASSERT(eventq != NULL);
l2 = eventq;
KDASSERT(l2 != NULL);
eventq = l2->l_forw;
DPRINTFN(8,
("sa_makeupcalls(%d.%d) unblocking extra %d\n",
p->p_pid, l->l_lid, l2->l_lid));
if (e_ss == NULL) {
e_ss = kmem_alloc(sizeof(*e_ss), KM_SLEEP);
}
sa_upcall_getstate(e_ss, l2);
SCHED_LOCK(s);
l2->l_flag &= ~L_SA_BLOCKING;
sa_putcachelwp(p, l2); /* PHOLD from sa_setwoken */
SCHED_UNLOCK(s);
error = copyout(&e_ss->ss_captured.ss_ctx,
e_ss->ss_captured.ss_sa.sa_context, ucsize);
sasp = &e_ss->ss_captured.ss_sa;
}
if (error != 0 ||
SACOPYOUT(sae, SAOUT_SA_T, sasp, sap) ||
SACOPYOUT(sae, SAOUT_SAP_T, &sap, sapp)) {
/* Copying onto the stack didn't work. Die. */
sadata_upcall_free(sau);
#ifdef DIAGNOSTIC
printf("sa_makeupcalls(%d.%d): couldn't copyout\n",
p->p_pid, l->l_lid);
#endif
if (e_ss != NULL) {
kmem_free(e_ss, sizeof(*e_ss));
}
sigexit(l, SIGILL);
/* NOTREACHED */
}
}
if (e_ss != NULL) {
kmem_free(e_ss, sizeof(*e_ss));
}
KDASSERT(eventq == NULL);
/* Copy out the arg, if any */
/* xxx assume alignment works out; everything so far has been
* a structure, so...
*/
if (sau->sau_arg) {
ap = STACK_ALLOC(stack, sau->sau_argsize);
stack = STACK_GROW(stack, sau->sau_argsize);
if (copyout(sau->sau_arg, ap, sau->sau_argsize) != 0) {
/* Copying onto the stack didn't work. Die. */
sadata_upcall_free(sau);
#ifdef DIAGNOSTIC
printf("sa_makeupcalls(%d.%d): couldn't copyout"
" sadata_upcall arg %p size %ld to %p \n",
p->p_pid, l->l_lid,
sau->sau_arg, (long) sau->sau_argsize, ap);
#endif
sigexit(l, SIGILL);
/* NOTREACHED */
}
} else {
ap = NULL;
#ifdef __hppa__
stack = STACK_ALIGN(stack, HPPA_FRAME_SIZE);
#endif
}
type = sau->sau_type;
sadata_upcall_free(sau);
DPRINTFN(7,("sa_makeupcalls(%d.%d): type %d\n", p->p_pid,
l->l_lid, type));
#ifdef KTRACE
if (KTRPOINT(p, KTR_SAUPCALL))
ktrsaupcall(l, type, nevents, nint, (void *)sapp, ap);
#endif
(*sae->sae_upcall)(l, type, nevents, nint, (void *)sapp, ap, stack,
sa->sa_upcall);
l->l_flag &= ~L_SA_YIELD;
}
static void
sa_setwoken(struct lwp *l)
{
struct lwp *l2, *vp_lwp;
struct proc *p;
struct sadata *sa;
struct sadata_vp *vp;
int s;
SCHED_LOCK(s);
if ((l->l_flag & L_SA_BLOCKING) == 0) {
SCHED_UNLOCK(s);
return;
}
p = l->l_proc;
sa = p->p_sa;
vp = l->l_savp;
vp_lwp = vp->savp_lwp;
l2 = NULL;
KDASSERT(vp_lwp != NULL);
DPRINTFN(3,("sa_setwoken(%d.%d) woken, flags %x, vp %d\n",
l->l_proc->p_pid, l->l_lid, l->l_flag,
vp_lwp->l_lid));
#if notyet
if (vp_lwp->l_flag & L_SA_IDLE) {
KDASSERT((vp_lwp->l_flag & L_SA_UPCALL) == 0);
KDASSERT(vp->savp_wokenq_head == NULL);
DPRINTFN(3,
("sa_setwoken(%d.%d) repossess: idle vp_lwp %d state %d\n",
l->l_proc->p_pid, l->l_lid,
vp_lwp->l_lid, vp_lwp->l_stat));
vp_lwp->l_flag &= ~L_SA_IDLE;
SCHED_UNLOCK(s);
return;
}
#endif
DPRINTFN(3,("sa_setwoken(%d.%d) put on wokenq: vp_lwp %d state %d\n",
l->l_proc->p_pid, l->l_lid, vp_lwp->l_lid,
vp_lwp->l_stat));
PHOLD(l);
if (vp->savp_wokenq_head == NULL)
vp->savp_wokenq_head = l;
else
*vp->savp_wokenq_tailp = l;
*(vp->savp_wokenq_tailp = &l->l_forw) = NULL;
switch (vp_lwp->l_stat) {
case LSONPROC:
if (vp_lwp->l_flag & L_SA_UPCALL)
break;
vp_lwp->l_flag |= L_SA_UPCALL;
if (vp_lwp->l_flag & L_SA_YIELD)
break;
/* XXX IPI vp_lwp->l_cpu */
break;
case LSSLEEP:
if (vp_lwp->l_flag & L_SA_IDLE) {
vp_lwp->l_flag &= ~L_SA_IDLE;
vp_lwp->l_flag |= L_SA_UPCALL;
setrunnable(vp_lwp);
break;
}
vp_lwp->l_flag |= L_SA_UPCALL;
break;
case LSSUSPENDED:
#ifdef DIAGNOSTIC
printf("sa_setwoken(%d.%d) vp lwp %d LSSUSPENDED\n",
l->l_proc->p_pid, l->l_lid, vp_lwp->l_lid);
#endif
break;
case LSSTOP:
vp_lwp->l_flag |= L_SA_UPCALL;
break;
case LSRUN:
if (vp_lwp->l_flag & L_SA_UPCALL)
break;
vp_lwp->l_flag |= L_SA_UPCALL;
if (vp_lwp->l_flag & L_SA_YIELD)
break;
if (vp_lwp->l_slptime > 1) {
void updatepri(struct lwp *);
updatepri(vp_lwp);
}
vp_lwp->l_slptime = 0;
if (vp_lwp->l_flag & L_INMEM) {
if (vp_lwp->l_cpu == curcpu())
l2 = vp_lwp;
else
need_resched(vp_lwp->l_cpu);
} else
sched_wakeup(&proc0);
break;
default:
panic("sa_vp LWP not sleeping/onproc/runnable");
}
l->l_stat = LSSUSPENDED;
p->p_nrlwps--;
mi_switch(l, l2);
/* maybe NOTREACHED */
SCHED_ASSERT_UNLOCKED();
splx(s);
if (p->p_flag & P_WEXIT)
lwp_exit(l);
}
static struct lwp *
sa_vp_repossess(struct lwp *l)
{
struct lwp *l2;
struct proc *p = l->l_proc;
struct sadata_vp *vp = l->l_savp;
SCHED_ASSERT_LOCKED();
/*
* Put ourselves on the virtual processor and note that the
* previous occupant of that position was interrupted.
*/
l2 = vp->savp_lwp;
vp->savp_lwp = l;
if (l2) {
if (l2->l_flag & L_SA_YIELD)
l2->l_flag &= ~(L_SA_YIELD|L_SA_IDLE);
DPRINTFN(1,("sa_vp_repossess(%d.%d) vp lwp %d state %d\n",
p->p_pid, l->l_lid, l2->l_lid, l2->l_stat));
KDASSERT(l2 != l);
switch (l2->l_stat) {
case LSRUN:
remrunqueue(l2);
p->p_nrlwps--;
break;
case LSSLEEP:
unsleep(l2);
l2->l_flag &= ~L_SINTR;
break;
case LSSUSPENDED:
#ifdef DIAGNOSTIC
printf("sa_vp_repossess(%d.%d) vp lwp %d LSSUSPENDED\n",
l->l_proc->p_pid, l->l_lid, l2->l_lid);
#endif
break;
#ifdef DIAGNOSTIC
default:
panic("SA VP %d.%d is in state %d, not running"
" or sleeping\n", p->p_pid, l2->l_lid,
l2->l_stat);
#endif
}
l2->l_stat = LSSUSPENDED;
}
return l2;
}
#ifdef DEBUG
int debug_print_sa(struct proc *);
int debug_print_lwp(struct lwp *);
int debug_print_proc(int);
int
debug_print_proc(int pid)
{
struct proc *p;
p = pfind(pid);
if (p == NULL)
printf("No process %d\n", pid);
else
debug_print_sa(p);
return 0;
}
int
debug_print_sa(struct proc *p)
{
struct lwp *l;
struct sadata *sa;
struct sadata_vp *vp;
printf("Process %d (%s), state %d, address %p, flags %x\n",
p->p_pid, p->p_comm, p->p_stat, p, p->p_flag);
printf("LWPs: %d (%d running, %d zombies)\n",
p->p_nlwps, p->p_nrlwps, p->p_nzlwps);
LIST_FOREACH(l, &p->p_lwps, l_sibling)
debug_print_lwp(l);
sa = p->p_sa;
if (sa) {
SLIST_FOREACH(vp, &sa->sa_vps, savp_next) {
if (vp->savp_lwp)
printf("SA VP: %d %s\n", vp->savp_lwp->l_lid,
vp->savp_lwp->l_flag & L_SA_YIELD ?
(vp->savp_lwp->l_flag & L_SA_IDLE ?
"idle" : "yielding") : "");
printf("SAs: %d cached LWPs\n", vp->savp_ncached);
LIST_FOREACH(l, &vp->savp_lwpcache, l_sibling)
debug_print_lwp(l);
}
}
return 0;
}
int
debug_print_lwp(struct lwp *l)
{
printf("LWP %d address %p ", l->l_lid, l);
printf("state %d flags %x ", l->l_stat, l->l_flag);
if (l->l_wchan)
printf("wait %p %s", l->l_wchan, l->l_wmesg);
printf("\n");
return 0;
}
#endif
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