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: releng/8.3/sys/kern/p1003_1b.c 217843 2011-01-25 20:48:48Z jhb $");
   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 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 = p_cansched(td, targetp);
  134         if (e == 0) {
  135                 e = ksched_setparam(ksched, targettd,
  136                         (const struct sched_param *)&sched_param);
  137         }
  138         PROC_UNLOCK(targetp);
  139         return (e);
  140 }
  141 
  142 int
  143 sched_getparam(struct thread *td, struct sched_getparam_args *uap)
  144 {
  145         int e;
  146         struct sched_param sched_param;
  147         struct thread *targettd;
  148         struct proc *targetp;
  149 
  150         if (uap->pid == 0) {
  151                 targetp = td->td_proc;
  152                 targettd = td;
  153                 PROC_LOCK(targetp);
  154         } else {
  155                 targetp = pfind(uap->pid);
  156                 if (targetp == NULL) {
  157                         return (ESRCH);
  158                 }
  159                 targettd = FIRST_THREAD_IN_PROC(targetp);
  160         }
  161 
  162         e = p_cansee(td, targetp);
  163         if (e == 0) {
  164                 e = ksched_getparam(ksched, targettd, &sched_param);
  165         }
  166         PROC_UNLOCK(targetp);
  167         if (e == 0)
  168                 e = copyout(&sched_param, uap->param, sizeof(sched_param));
  169         return (e);
  170 }
  171 
  172 int
  173 sched_setscheduler(struct thread *td, struct sched_setscheduler_args *uap)
  174 {
  175         int e;
  176         struct sched_param sched_param;
  177         struct thread *targettd;
  178         struct proc *targetp;
  179 
  180         /* Don't allow non root user to set a scheduler policy. */
  181         e = priv_check(td, PRIV_SCHED_SET);
  182         if (e)
  183                 return (e);
  184 
  185         e = copyin(uap->param, &sched_param, sizeof(sched_param));
  186         if (e)
  187                 return (e);
  188 
  189         if (uap->pid == 0) {
  190                 targetp = td->td_proc;
  191                 targettd = td;
  192                 PROC_LOCK(targetp);
  193         } else {
  194                 targetp = pfind(uap->pid);
  195                 if (targetp == NULL)
  196                         return (ESRCH);
  197                 targettd = FIRST_THREAD_IN_PROC(targetp);
  198         }
  199 
  200         e = p_cansched(td, targetp);
  201         if (e == 0) {
  202                 e = ksched_setscheduler(ksched, targettd,
  203                         uap->policy, (const struct sched_param *)&sched_param);
  204         }
  205         PROC_UNLOCK(targetp);
  206         return (e);
  207 }
  208 
  209 int
  210 sched_getscheduler(struct thread *td, struct sched_getscheduler_args *uap)
  211 {
  212         int e, policy;
  213         struct thread *targettd;
  214         struct proc *targetp;
  215 
  216         if (uap->pid == 0) {
  217                 targetp = td->td_proc;
  218                 targettd = td;
  219                 PROC_LOCK(targetp);
  220         } else {
  221                 targetp = pfind(uap->pid);
  222                 if (targetp == NULL)
  223                         return (ESRCH);
  224                 targettd = FIRST_THREAD_IN_PROC(targetp);
  225         }
  226 
  227         e = p_cansee(td, targetp);
  228         if (e == 0) {
  229                 e = ksched_getscheduler(ksched, targettd, &policy);
  230                 td->td_retval[0] = policy;
  231         }
  232         PROC_UNLOCK(targetp);
  233 
  234         return (e);
  235 }
  236 
  237 int
  238 sched_yield(struct thread *td, struct sched_yield_args *uap)
  239 {
  240 
  241         sched_relinquish(curthread);
  242         return 0;
  243 }
  244 
  245 int
  246 sched_get_priority_max(struct thread *td,
  247     struct sched_get_priority_max_args *uap)
  248 {
  249         int error, prio;
  250 
  251         error = ksched_get_priority_max(ksched, uap->policy, &prio);
  252         td->td_retval[0] = prio;
  253         return (error);
  254 }
  255 
  256 int
  257 sched_get_priority_min(struct thread *td,
  258     struct sched_get_priority_min_args *uap)
  259 {
  260         int error, prio;
  261 
  262         error = ksched_get_priority_min(ksched, uap->policy, &prio);
  263         td->td_retval[0] = prio;
  264         return (error);
  265 }
  266 
  267 int
  268 sched_rr_get_interval(struct thread *td,
  269     struct sched_rr_get_interval_args *uap)
  270 {
  271         struct timespec timespec;
  272         int error;
  273 
  274         error = kern_sched_rr_get_interval(td, uap->pid, &timespec);
  275         if (error == 0)
  276                 error = copyout(&timespec, uap->interval, sizeof(timespec));
  277         return (error);
  278 }
  279 
  280 int
  281 kern_sched_rr_get_interval(struct thread *td, pid_t pid,
  282     struct timespec *ts)
  283 {
  284         int e;
  285         struct thread *targettd;
  286         struct proc *targetp;
  287 
  288         if (pid == 0) {
  289                 targettd = td;
  290                 targetp = td->td_proc;
  291                 PROC_LOCK(targetp);
  292         } else {
  293                 targetp = pfind(pid);
  294                 if (targetp == NULL)
  295                         return (ESRCH);
  296                 targettd = FIRST_THREAD_IN_PROC(targetp);
  297         }
  298 
  299         e = p_cansee(td, targetp);
  300         if (e == 0)
  301                 e = ksched_rr_get_interval(ksched, targettd, ts);
  302         PROC_UNLOCK(targetp);
  303         return (e);
  304 }
  305 
  306 #endif
  307 
  308 static void
  309 p31binit(void *notused)
  310 {
  311         (void) sched_attach();
  312         p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
  313 }
  314 
  315 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);

Cache object: 3a4def7cc2be29d5d5333573777aeae3


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