p1003_1b.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1996, 1997, 1998
    5  *      HD Associates, Inc.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by HD Associates, Inc
   18  * 4. Neither the name of the author nor the names of any co-contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 /* p1003_1b: Real Time common code.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include "opt_posix.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/module.h>
   48 #include <sys/mutex.h>
   49 #include <sys/priv.h>
   50 #include <sys/proc.h>
   51 #include <sys/posix4.h>
   52 #include <sys/syscallsubr.h>
   53 #include <sys/sysctl.h>
   54 #include <sys/syslog.h>
   55 #include <sys/sysproto.h>
   56 
   57 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
   58 
   59 /* The system calls return ENOSYS if an entry is called that is not run-time
   60  * supported.  I am also logging since some programs start to use this when
   61  * they shouldn't.  That will be removed if annoying.
   62  */
   63 int
   64 syscall_not_present(struct thread *td, const char *s, struct nosys_args *uap)
   65 {
   66         log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
   67                         td->td_name, td->td_proc->p_pid, s);
   68 
   69         /* a " return nosys(p, uap); " here causes a core dump.
   70          */
   71 
   72         return ENOSYS;
   73 }
   74 
   75 #if !defined(_KPOSIX_PRIORITY_SCHEDULING)
   76 
   77 /* Not configured but loadable via a module:
   78  */
   79 
   80 static int
   81 sched_attach(void)
   82 {
   83         return 0;
   84 }
   85 
   86 SYSCALL_NOT_PRESENT_GEN(sched_setparam)
   87 SYSCALL_NOT_PRESENT_GEN(sched_getparam)
   88 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
   89 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
   90 SYSCALL_NOT_PRESENT_GEN(sched_yield)
   91 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
   92 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
   93 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
   94 #else
   95 
   96 /* Configured in kernel version:
   97  */
   98 static struct ksched *ksched;
   99 
  100 static int
  101 sched_attach(void)
  102 {
  103         int ret = ksched_attach(&ksched);
  104 
  105         if (ret == 0)
  106                 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 200112L);
  107 
  108         return ret;
  109 }
  110 
  111 int
  112 sys_sched_setparam(struct thread *td, struct sched_setparam_args *uap)
  113 {
  114         struct thread *targettd;
  115         struct proc *targetp;
  116         int e;
  117         struct sched_param sched_param;
  118 
  119         e = copyin(uap->param, &sched_param, sizeof(sched_param));
  120         if (e)
  121                 return (e);
  122 
  123         if (uap->pid == 0) {
  124                 targetp = td->td_proc;
  125                 targettd = td;
  126                 PROC_LOCK(targetp);
  127         } else {
  128                 targetp = pfind(uap->pid);
  129                 if (targetp == NULL)
  130                         return (ESRCH);
  131                 targettd = FIRST_THREAD_IN_PROC(targetp);
  132         }
  133 
  134         e = kern_sched_setparam(td, targettd, &sched_param);
  135         PROC_UNLOCK(targetp);
  136         return (e);
  137 }
  138 
  139 int
  140 kern_sched_setparam(struct thread *td, struct thread *targettd,
  141     struct sched_param *param)
  142 {
  143         struct proc *targetp;
  144         int error;
  145 
  146         targetp = targettd->td_proc;
  147         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  148 
  149         error = p_cansched(td, targetp);
  150         if (error == 0)
  151                 error = ksched_setparam(ksched, targettd,
  152                     (const struct sched_param *)param);
  153         return (error);
  154 }
  155 
  156 int
  157 sys_sched_getparam(struct thread *td, struct sched_getparam_args *uap)
  158 {
  159         int e;
  160         struct sched_param sched_param;
  161         struct thread *targettd;
  162         struct proc *targetp;
  163 
  164         if (uap->pid == 0) {
  165                 targetp = td->td_proc;
  166                 targettd = td;
  167                 PROC_LOCK(targetp);
  168         } else {
  169                 targetp = pfind(uap->pid);
  170                 if (targetp == NULL) {
  171                         return (ESRCH);
  172                 }
  173                 targettd = FIRST_THREAD_IN_PROC(targetp);
  174         }
  175 
  176         e = kern_sched_getparam(td, targettd, &sched_param);
  177         PROC_UNLOCK(targetp);
  178         if (e == 0)
  179                 e = copyout(&sched_param, uap->param, sizeof(sched_param));
  180         return (e);
  181 }
  182 
  183 int
  184 kern_sched_getparam(struct thread *td, struct thread *targettd,
  185     struct sched_param *param)
  186 {
  187         struct proc *targetp;
  188         int error;
  189 
  190         targetp = targettd->td_proc;
  191         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  192 
  193         error = p_cansee(td, targetp);
  194         if (error == 0)
  195                 error = ksched_getparam(ksched, targettd, param);
  196         return (error);
  197 }
  198 
  199 int
  200 sys_sched_setscheduler(struct thread *td, struct sched_setscheduler_args *uap)
  201 {
  202         int e;
  203         struct sched_param sched_param;
  204         struct thread *targettd;
  205         struct proc *targetp;
  206 
  207         e = copyin(uap->param, &sched_param, sizeof(sched_param));
  208         if (e)
  209                 return (e);
  210 
  211         if (uap->pid == 0) {
  212                 targetp = td->td_proc;
  213                 targettd = td;
  214                 PROC_LOCK(targetp);
  215         } else {
  216                 targetp = pfind(uap->pid);
  217                 if (targetp == NULL)
  218                         return (ESRCH);
  219                 targettd = FIRST_THREAD_IN_PROC(targetp);
  220         }
  221 
  222         e = kern_sched_setscheduler(td, targettd, uap->policy,
  223             &sched_param);
  224         PROC_UNLOCK(targetp);
  225         return (e);
  226 }
  227 
  228 int
  229 kern_sched_setscheduler(struct thread *td, struct thread *targettd,
  230     int policy, struct sched_param *param)
  231 {
  232         struct proc *targetp;
  233         int error;
  234 
  235         targetp = targettd->td_proc;
  236         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  237 
  238         /* Don't allow non root user to set a scheduler policy. */
  239         error = priv_check(td, PRIV_SCHED_SET);
  240         if (error)
  241                 return (error);
  242 
  243         error = p_cansched(td, targetp);
  244         if (error == 0)
  245                 error = ksched_setscheduler(ksched, targettd, policy,
  246                     (const struct sched_param *)param);
  247         return (error);
  248 }
  249 
  250 int
  251 sys_sched_getscheduler(struct thread *td, struct sched_getscheduler_args *uap)
  252 {
  253         int e, policy;
  254         struct thread *targettd;
  255         struct proc *targetp;
  256 
  257         if (uap->pid == 0) {
  258                 targetp = td->td_proc;
  259                 targettd = td;
  260                 PROC_LOCK(targetp);
  261         } else {
  262                 targetp = pfind(uap->pid);
  263                 if (targetp == NULL)
  264                         return (ESRCH);
  265                 targettd = FIRST_THREAD_IN_PROC(targetp);
  266         }
  267 
  268         e = kern_sched_getscheduler(td, targettd, &policy);
  269         PROC_UNLOCK(targetp);
  270         if (e == 0)
  271                 td->td_retval[0] = policy;
  272 
  273         return (e);
  274 }
  275 
  276 int
  277 kern_sched_getscheduler(struct thread *td, struct thread *targettd,
  278     int *policy)
  279 {
  280         struct proc *targetp;
  281         int error;
  282 
  283         targetp = targettd->td_proc;
  284         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  285 
  286         error = p_cansee(td, targetp);
  287         if (error == 0)
  288                 error = ksched_getscheduler(ksched, targettd, policy);
  289         return (error);
  290 }
  291 
  292 int
  293 sys_sched_yield(struct thread *td, struct sched_yield_args *uap)
  294 {
  295 
  296         sched_relinquish(td);
  297         return (0);
  298 }
  299 
  300 int
  301 sys_sched_get_priority_max(struct thread *td,
  302     struct sched_get_priority_max_args *uap)
  303 {
  304         int error, prio;
  305 
  306         error = ksched_get_priority_max(ksched, uap->policy, &prio);
  307         td->td_retval[0] = prio;
  308         return (error);
  309 }
  310 
  311 int
  312 sys_sched_get_priority_min(struct thread *td,
  313     struct sched_get_priority_min_args *uap)
  314 {
  315         int error, prio;
  316 
  317         error = ksched_get_priority_min(ksched, uap->policy, &prio);
  318         td->td_retval[0] = prio;
  319         return (error);
  320 }
  321 
  322 int
  323 sys_sched_rr_get_interval(struct thread *td,
  324     struct sched_rr_get_interval_args *uap)
  325 {
  326         struct timespec timespec;
  327         int error;
  328 
  329         error = kern_sched_rr_get_interval(td, uap->pid, &timespec);
  330         if (error == 0)
  331                 error = copyout(&timespec, uap->interval, sizeof(timespec));
  332         return (error);
  333 }
  334 
  335 int
  336 kern_sched_rr_get_interval(struct thread *td, pid_t pid,
  337     struct timespec *ts)
  338 {
  339         int e;
  340         struct thread *targettd;
  341         struct proc *targetp;
  342 
  343         if (pid == 0) {
  344                 targettd = td;
  345                 targetp = td->td_proc;
  346                 PROC_LOCK(targetp);
  347         } else {
  348                 targetp = pfind(pid);
  349                 if (targetp == NULL)
  350                         return (ESRCH);
  351                 targettd = FIRST_THREAD_IN_PROC(targetp);
  352         }
  353 
  354         e = kern_sched_rr_get_interval_td(td, targettd, ts);
  355         PROC_UNLOCK(targetp);
  356         return (e);
  357 }
  358 
  359 int
  360 kern_sched_rr_get_interval_td(struct thread *td, struct thread *targettd,
  361     struct timespec *ts)
  362 {
  363         struct proc *p;
  364         int error;
  365 
  366         p = targettd->td_proc;
  367         PROC_LOCK_ASSERT(p, MA_OWNED);
  368 
  369         error = p_cansee(td, p);
  370         if (error == 0)
  371                 error = ksched_rr_get_interval(ksched, targettd, ts);
  372         return (error);
  373 }
  374 #endif
  375 
  376 static void
  377 p31binit(void *notused)
  378 {
  379         (void) sched_attach();
  380         p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
  381 }
  382 
  383 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);
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FreeBSD/Linux Kernel Cross Reference sys/kern/p1003_1b.c

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sys/kern/p1003_1b.c
