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  * 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: head/sys/kern/p1003_1b.c 325966 2017-11-18 14:26:50Z pfg $");
   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/sysent.h>
   55 #include <sys/syslog.h>
   56 #include <sys/sysproto.h>
   57 
   58 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
   59 
   60 /* The system calls return ENOSYS if an entry is called that is not run-time
   61  * supported.  I am also logging since some programs start to use this when
   62  * they shouldn't.  That will be removed if annoying.
   63  */
   64 int
   65 syscall_not_present(struct thread *td, const char *s, struct nosys_args *uap)
   66 {
   67         log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
   68                         td->td_name, td->td_proc->p_pid, s);
   69 
   70         /* a " return nosys(p, uap); " here causes a core dump.
   71          */
   72 
   73         return ENOSYS;
   74 }
   75 
   76 #if !defined(_KPOSIX_PRIORITY_SCHEDULING)
   77 
   78 /* Not configured but loadable via a module:
   79  */
   80 
   81 static int
   82 sched_attach(void)
   83 {
   84         return 0;
   85 }
   86 
   87 SYSCALL_NOT_PRESENT_GEN(sched_setparam)
   88 SYSCALL_NOT_PRESENT_GEN(sched_getparam)
   89 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
   90 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
   91 SYSCALL_NOT_PRESENT_GEN(sched_yield)
   92 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
   93 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
   94 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
   95 #else
   96 
   97 /* Configured in kernel version:
   98  */
   99 static struct ksched *ksched;
  100 
  101 static int
  102 sched_attach(void)
  103 {
  104         int ret = ksched_attach(&ksched);
  105 
  106         if (ret == 0)
  107                 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 200112L);
  108 
  109         return ret;
  110 }
  111 
  112 int
  113 sys_sched_setparam(struct thread *td, struct sched_setparam_args *uap)
  114 {
  115         struct thread *targettd;
  116         struct proc *targetp;
  117         int e;
  118         struct sched_param sched_param;
  119 
  120         e = copyin(uap->param, &sched_param, sizeof(sched_param));
  121         if (e)
  122                 return (e);
  123 
  124         if (uap->pid == 0) {
  125                 targetp = td->td_proc;
  126                 targettd = td;
  127                 PROC_LOCK(targetp);
  128         } else {
  129                 targetp = pfind(uap->pid);
  130                 if (targetp == NULL)
  131                         return (ESRCH);
  132                 targettd = FIRST_THREAD_IN_PROC(targetp);
  133         }
  134 
  135         e = kern_sched_setparam(td, targettd, &sched_param);
  136         PROC_UNLOCK(targetp);
  137         return (e);
  138 }
  139 
  140 int
  141 kern_sched_setparam(struct thread *td, struct thread *targettd,
  142     struct sched_param *param)
  143 {
  144         struct proc *targetp;
  145         int error;
  146 
  147         targetp = targettd->td_proc;
  148         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  149 
  150         error = p_cansched(td, targetp);
  151         if (error == 0)
  152                 error = ksched_setparam(ksched, targettd,
  153                     (const struct sched_param *)param);
  154         return (error);
  155 }
  156 
  157 int
  158 sys_sched_getparam(struct thread *td, struct sched_getparam_args *uap)
  159 {
  160         int e;
  161         struct sched_param sched_param;
  162         struct thread *targettd;
  163         struct proc *targetp;
  164 
  165         if (uap->pid == 0) {
  166                 targetp = td->td_proc;
  167                 targettd = td;
  168                 PROC_LOCK(targetp);
  169         } else {
  170                 targetp = pfind(uap->pid);
  171                 if (targetp == NULL) {
  172                         return (ESRCH);
  173                 }
  174                 targettd = FIRST_THREAD_IN_PROC(targetp);
  175         }
  176 
  177         e = kern_sched_getparam(td, targettd, &sched_param);
  178         PROC_UNLOCK(targetp);
  179         if (e == 0)
  180                 e = copyout(&sched_param, uap->param, sizeof(sched_param));
  181         return (e);
  182 }
  183 
  184 int
  185 kern_sched_getparam(struct thread *td, struct thread *targettd,
  186     struct sched_param *param)
  187 {
  188         struct proc *targetp;
  189         int error;
  190 
  191         targetp = targettd->td_proc;
  192         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  193 
  194         error = p_cansee(td, targetp);
  195         if (error == 0)
  196                 error = ksched_getparam(ksched, targettd, param);
  197         return (error);
  198 }
  199 
  200 int
  201 sys_sched_setscheduler(struct thread *td, struct sched_setscheduler_args *uap)
  202 {
  203         int e;
  204         struct sched_param sched_param;
  205         struct thread *targettd;
  206         struct proc *targetp;
  207 
  208         e = copyin(uap->param, &sched_param, sizeof(sched_param));
  209         if (e)
  210                 return (e);
  211 
  212         if (uap->pid == 0) {
  213                 targetp = td->td_proc;
  214                 targettd = td;
  215                 PROC_LOCK(targetp);
  216         } else {
  217                 targetp = pfind(uap->pid);
  218                 if (targetp == NULL)
  219                         return (ESRCH);
  220                 targettd = FIRST_THREAD_IN_PROC(targetp);
  221         }
  222 
  223         e = kern_sched_setscheduler(td, targettd, uap->policy,
  224             &sched_param);
  225         PROC_UNLOCK(targetp);
  226         return (e);
  227 }
  228 
  229 int
  230 kern_sched_setscheduler(struct thread *td, struct thread *targettd,
  231     int policy, struct sched_param *param)
  232 {
  233         struct proc *targetp;
  234         int error;
  235 
  236         targetp = targettd->td_proc;
  237         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  238 
  239         /* Don't allow non root user to set a scheduler policy. */
  240         error = priv_check(td, PRIV_SCHED_SET);
  241         if (error)
  242                 return (error);
  243 
  244         error = p_cansched(td, targetp);
  245         if (error == 0)
  246                 error = ksched_setscheduler(ksched, targettd, policy,
  247                     (const struct sched_param *)param);
  248         return (error);
  249 }
  250 
  251 int
  252 sys_sched_getscheduler(struct thread *td, struct sched_getscheduler_args *uap)
  253 {
  254         int e, policy;
  255         struct thread *targettd;
  256         struct proc *targetp;
  257 
  258         if (uap->pid == 0) {
  259                 targetp = td->td_proc;
  260                 targettd = td;
  261                 PROC_LOCK(targetp);
  262         } else {
  263                 targetp = pfind(uap->pid);
  264                 if (targetp == NULL)
  265                         return (ESRCH);
  266                 targettd = FIRST_THREAD_IN_PROC(targetp);
  267         }
  268 
  269         e = kern_sched_getscheduler(td, targettd, &policy);
  270         PROC_UNLOCK(targetp);
  271         if (e == 0)
  272                 td->td_retval[0] = policy;
  273 
  274         return (e);
  275 }
  276 
  277 int
  278 kern_sched_getscheduler(struct thread *td, struct thread *targettd,
  279     int *policy)
  280 {
  281         struct proc *targetp;
  282         int error;
  283 
  284         targetp = targettd->td_proc;
  285         PROC_LOCK_ASSERT(targetp, MA_OWNED);
  286 
  287         error = p_cansee(td, targetp);
  288         if (error == 0)
  289                 error = ksched_getscheduler(ksched, targettd, policy);
  290         return (error);
  291 }
  292 
  293 int
  294 sys_sched_yield(struct thread *td, struct sched_yield_args *uap)
  295 {
  296 
  297         sched_relinquish(td);
  298         return (0);
  299 }
  300 
  301 int
  302 sys_sched_get_priority_max(struct thread *td,
  303     struct sched_get_priority_max_args *uap)
  304 {
  305         int error, prio;
  306 
  307         error = ksched_get_priority_max(ksched, uap->policy, &prio);
  308         td->td_retval[0] = prio;
  309         return (error);
  310 }
  311 
  312 int
  313 sys_sched_get_priority_min(struct thread *td,
  314     struct sched_get_priority_min_args *uap)
  315 {
  316         int error, prio;
  317 
  318         error = ksched_get_priority_min(ksched, uap->policy, &prio);
  319         td->td_retval[0] = prio;
  320         return (error);
  321 }
  322 
  323 int
  324 sys_sched_rr_get_interval(struct thread *td,
  325     struct sched_rr_get_interval_args *uap)
  326 {
  327         struct timespec timespec;
  328         int error;
  329 
  330         error = kern_sched_rr_get_interval(td, uap->pid, &timespec);
  331         if (error == 0)
  332                 error = copyout(&timespec, uap->interval, sizeof(timespec));
  333         return (error);
  334 }
  335 
  336 int
  337 kern_sched_rr_get_interval(struct thread *td, pid_t pid,
  338     struct timespec *ts)
  339 {
  340         int e;
  341         struct thread *targettd;
  342         struct proc *targetp;
  343 
  344         if (pid == 0) {
  345                 targettd = td;
  346                 targetp = td->td_proc;
  347                 PROC_LOCK(targetp);
  348         } else {
  349                 targetp = pfind(pid);
  350                 if (targetp == NULL)
  351                         return (ESRCH);
  352                 targettd = FIRST_THREAD_IN_PROC(targetp);
  353         }
  354 
  355         e = kern_sched_rr_get_interval_td(td, targettd, ts);
  356         PROC_UNLOCK(targetp);
  357         return (e);
  358 }
  359 
  360 int
  361 kern_sched_rr_get_interval_td(struct thread *td, struct thread *targettd,
  362     struct timespec *ts)
  363 {
  364         struct proc *p;
  365         int error;
  366 
  367         p = targettd->td_proc;
  368         PROC_LOCK_ASSERT(p, MA_OWNED);
  369 
  370         error = p_cansee(td, p);
  371         if (error == 0)
  372                 error = ksched_rr_get_interval(ksched, targettd, ts);
  373         return (error);
  374 }
  375 #endif
  376 
  377 static void
  378 p31binit(void *notused)
  379 {
  380         (void) sched_attach();
  381         p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
  382 }
  383 
  384 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);

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