The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/p1003_1b.c

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    1 /*-
    2  * Copyright (c) 1996, 1997, 1998
    3  *      HD Associates, Inc.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by HD Associates, Inc
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /* p1003_1b: Real Time common code.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: stable/10/sys/kern/p1003_1b.c 293485 2016-01-09 14:44:41Z dchagin $");
   38 
   39 #include "opt_posix.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/kernel.h>
   44 #include <sys/lock.h>
   45 #include <sys/module.h>
   46 #include <sys/mutex.h>
   47 #include <sys/priv.h>
   48 #include <sys/proc.h>
   49 #include <sys/posix4.h>
   50 #include <sys/syscallsubr.h>
   51 #include <sys/sysctl.h>
   52 #include <sys/sysent.h>
   53 #include <sys/syslog.h>
   54 #include <sys/sysproto.h>
   55 
   56 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
   57 
   58 /* The system calls return ENOSYS if an entry is called that is not run-time
   59  * supported.  I am also logging since some programs start to use this when
   60  * they shouldn't.  That will be removed if annoying.
   61  */
   62 int
   63 syscall_not_present(struct thread *td, const char *s, struct nosys_args *uap)
   64 {
   65         log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
   66                         td->td_name, td->td_proc->p_pid, s);
   67 
   68         /* a " return nosys(p, uap); " here causes a core dump.
   69          */
   70 
   71         return ENOSYS;
   72 }
   73 
   74 #if !defined(_KPOSIX_PRIORITY_SCHEDULING)
   75 
   76 /* Not configured but loadable via a module:
   77  */
   78 
   79 static int
   80 sched_attach(void)
   81 {
   82         return 0;
   83 }
   84 
   85 SYSCALL_NOT_PRESENT_GEN(sched_setparam)
   86 SYSCALL_NOT_PRESENT_GEN(sched_getparam)
   87 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
   88 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
   89 SYSCALL_NOT_PRESENT_GEN(sched_yield)
   90 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
   91 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
   92 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
   93 #else
   94 
   95 /* Configured in kernel version:
   96  */
   97 static struct ksched *ksched;
   98 
   99 static int
  100 sched_attach(void)
  101 {
  102         int ret = ksched_attach(&ksched);
  103 
  104         if (ret == 0)
  105                 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 200112L);
  106 
  107         return ret;
  108 }
  109 
  110 int
  111 sys_sched_setparam(struct thread *td, struct sched_setparam_args *uap)
  112 {
  113         struct thread *targettd;
  114         struct proc *targetp;
  115         int e;
  116         struct sched_param sched_param;
  117 
  118         e = copyin(uap->param, &sched_param, sizeof(sched_param));
  119         if (e)
  120                 return (e);
  121 
  122         if (uap->pid == 0) {
  123                 targetp = td->td_proc;
  124                 targettd = td;
  125                 PROC_LOCK(targetp);
  126         } else {
  127                 targetp = pfind(uap->pid);
  128                 if (targetp == NULL)
  129                         return (ESRCH);
  130                 targettd = FIRST_THREAD_IN_PROC(targetp);
  131         }
  132 
  133         e = kern_sched_setparam(td, targettd, &sched_param);
  134         PROC_UNLOCK(targetp);
  135         return (e);
  136 }
  137 
  138 int
  139 kern_sched_setparam(struct thread *td, struct thread *targettd,
  140     struct sched_param *param)
  141 {
  142         struct proc *targetp;
  143         int error;
  144 
  145         targetp = targettd->td_proc;
  146         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  147 
  148         error = p_cansched(td, targetp);
  149         if (error == 0)
  150                 error = ksched_setparam(ksched, targettd,
  151                     (const struct sched_param *)param);
  152         return (error);
  153 }
  154 
  155 int
  156 sys_sched_getparam(struct thread *td, struct sched_getparam_args *uap)
  157 {
  158         int e;
  159         struct sched_param sched_param;
  160         struct thread *targettd;
  161         struct proc *targetp;
  162 
  163         if (uap->pid == 0) {
  164                 targetp = td->td_proc;
  165                 targettd = td;
  166                 PROC_LOCK(targetp);
  167         } else {
  168                 targetp = pfind(uap->pid);
  169                 if (targetp == NULL) {
  170                         return (ESRCH);
  171                 }
  172                 targettd = FIRST_THREAD_IN_PROC(targetp);
  173         }
  174 
  175         e = kern_sched_getparam(td, targettd, &sched_param);
  176         PROC_UNLOCK(targetp);
  177         if (e == 0)
  178                 e = copyout(&sched_param, uap->param, sizeof(sched_param));
  179         return (e);
  180 }
  181 
  182 int
  183 kern_sched_getparam(struct thread *td, struct thread *targettd,
  184     struct sched_param *param)
  185 {
  186         struct proc *targetp;
  187         int error;
  188 
  189         targetp = targettd->td_proc;
  190         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  191 
  192         error = p_cansee(td, targetp);
  193         if (error == 0)
  194                 error = ksched_getparam(ksched, targettd, param);
  195         return (error);
  196 }
  197 
  198 int
  199 sys_sched_setscheduler(struct thread *td, struct sched_setscheduler_args *uap)
  200 {
  201         int e;
  202         struct sched_param sched_param;
  203         struct thread *targettd;
  204         struct proc *targetp;
  205 
  206         e = copyin(uap->param, &sched_param, sizeof(sched_param));
  207         if (e)
  208                 return (e);
  209 
  210         if (uap->pid == 0) {
  211                 targetp = td->td_proc;
  212                 targettd = td;
  213                 PROC_LOCK(targetp);
  214         } else {
  215                 targetp = pfind(uap->pid);
  216                 if (targetp == NULL)
  217                         return (ESRCH);
  218                 targettd = FIRST_THREAD_IN_PROC(targetp);
  219         }
  220 
  221         e = kern_sched_setscheduler(td, targettd, uap->policy,
  222             &sched_param);
  223         PROC_UNLOCK(targetp);
  224         return (e);
  225 }
  226 
  227 int
  228 kern_sched_setscheduler(struct thread *td, struct thread *targettd,
  229     int policy, struct sched_param *param)
  230 {
  231         struct proc *targetp;
  232         int error;
  233 
  234         targetp = targettd->td_proc;
  235         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  236 
  237         /* Don't allow non root user to set a scheduler policy. */
  238         error = priv_check(td, PRIV_SCHED_SET);
  239         if (error)
  240                 return (error);
  241 
  242         error = p_cansched(td, targetp);
  243         if (error == 0)
  244                 error = ksched_setscheduler(ksched, targettd, policy,
  245                     (const struct sched_param *)param);
  246         return (error);
  247 }
  248 
  249 int
  250 sys_sched_getscheduler(struct thread *td, struct sched_getscheduler_args *uap)
  251 {
  252         int e, policy;
  253         struct thread *targettd;
  254         struct proc *targetp;
  255 
  256         if (uap->pid == 0) {
  257                 targetp = td->td_proc;
  258                 targettd = td;
  259                 PROC_LOCK(targetp);
  260         } else {
  261                 targetp = pfind(uap->pid);
  262                 if (targetp == NULL)
  263                         return (ESRCH);
  264                 targettd = FIRST_THREAD_IN_PROC(targetp);
  265         }
  266 
  267         e = kern_sched_getscheduler(td, targettd, &policy);
  268         PROC_UNLOCK(targetp);
  269         if (e == 0)
  270                 td->td_retval[0] = policy;
  271 
  272         return (e);
  273 }
  274 
  275 int
  276 kern_sched_getscheduler(struct thread *td, struct thread *targettd,
  277     int *policy)
  278 {
  279         struct proc *targetp;
  280         int error;
  281 
  282         targetp = targettd->td_proc;
  283         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  284 
  285         error = p_cansee(td, targetp);
  286         if (error == 0)
  287                 error = ksched_getscheduler(ksched, targettd, policy);
  288         return (error);
  289 }
  290 
  291 int
  292 sys_sched_yield(struct thread *td, struct sched_yield_args *uap)
  293 {
  294 
  295         sched_relinquish(curthread);
  296         return 0;
  297 }
  298 
  299 int
  300 sys_sched_get_priority_max(struct thread *td,
  301     struct sched_get_priority_max_args *uap)
  302 {
  303         int error, prio;
  304 
  305         error = ksched_get_priority_max(ksched, uap->policy, &prio);
  306         td->td_retval[0] = prio;
  307         return (error);
  308 }
  309 
  310 int
  311 sys_sched_get_priority_min(struct thread *td,
  312     struct sched_get_priority_min_args *uap)
  313 {
  314         int error, prio;
  315 
  316         error = ksched_get_priority_min(ksched, uap->policy, &prio);
  317         td->td_retval[0] = prio;
  318         return (error);
  319 }
  320 
  321 int
  322 sys_sched_rr_get_interval(struct thread *td,
  323     struct sched_rr_get_interval_args *uap)
  324 {
  325         struct timespec timespec;
  326         int error;
  327 
  328         error = kern_sched_rr_get_interval(td, uap->pid, &timespec);
  329         if (error == 0)
  330                 error = copyout(&timespec, uap->interval, sizeof(timespec));
  331         return (error);
  332 }
  333 
  334 int
  335 kern_sched_rr_get_interval(struct thread *td, pid_t pid,
  336     struct timespec *ts)
  337 {
  338         int e;
  339         struct thread *targettd;
  340         struct proc *targetp;
  341 
  342         if (pid == 0) {
  343                 targettd = td;
  344                 targetp = td->td_proc;
  345                 PROC_LOCK(targetp);
  346         } else {
  347                 targetp = pfind(pid);
  348                 if (targetp == NULL)
  349                         return (ESRCH);
  350                 targettd = FIRST_THREAD_IN_PROC(targetp);
  351         }
  352 
  353         e = kern_sched_rr_get_interval_td(td, targettd, ts);
  354         PROC_UNLOCK(targetp);
  355         return (e);
  356 }
  357 
  358 int
  359 kern_sched_rr_get_interval_td(struct thread *td, struct thread *targettd,
  360     struct timespec *ts)
  361 {
  362         struct proc *p;
  363         int error;
  364 
  365         p = targettd->td_proc;
  366         PROC_LOCK_ASSERT(p, MA_OWNED);
  367 
  368         error = p_cansee(td, p);
  369         if (error == 0)
  370                 error = ksched_rr_get_interval(ksched, targettd, ts);
  371         return (error);
  372 }
  373 #endif
  374 
  375 static void
  376 p31binit(void *notused)
  377 {
  378         (void) sched_attach();
  379         p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
  380 }
  381 
  382 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);

Cache object: 532fd4c74c250b515c32144abf0ab3c9


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