sys/kern/p1003_1b.c

   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("$FreeBSD$");
  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, 1);
 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                         e = ESRCH;
 224                         goto done2;
 225                 }
 226                 targettd = FIRST_THREAD_IN_PROC(targetp);
 227         }
 228
 229         e = p_cansee(td, targetp);
 230         if (e == 0) {
 231                 e = ksched_getscheduler(ksched, targettd, &policy);
 232                 td->td_retval[0] = policy;
 233         }
 234         PROC_UNLOCK(targetp);
 235
 236 done2:
 237         return (e);
 238 }
 239
 240 int
 241 sched_yield(struct thread *td, struct sched_yield_args *uap)
 242 {
 243
 244         sched_relinquish(curthread);
 245         return 0;
 246 }
 247
 248 int
 249 sched_get_priority_max(struct thread *td,
 250     struct sched_get_priority_max_args *uap)
 251 {
 252         int error, prio;
 253
 254         error = ksched_get_priority_max(ksched, uap->policy, &prio);
 255         td->td_retval[0] = prio;
 256         return (error);
 257 }
 258
 259 int
 260 sched_get_priority_min(struct thread *td,
 261     struct sched_get_priority_min_args *uap)
 262 {
 263         int error, prio;
 264
 265         error = ksched_get_priority_min(ksched, uap->policy, &prio);
 266         td->td_retval[0] = prio;
 267         return (error);
 268 }
 269
 270 int
 271 sched_rr_get_interval(struct thread *td,
 272     struct sched_rr_get_interval_args *uap)
 273 {
 274         struct timespec timespec;
 275         int error;
 276
 277         error = kern_sched_rr_get_interval(td, uap->pid, &timespec);
 278         if (error == 0)
 279                 error = copyout(&timespec, uap->interval, sizeof(timespec));
 280         return (error);
 281 }
 282
 283 int
 284 kern_sched_rr_get_interval(struct thread *td, pid_t pid,
 285     struct timespec *ts)
 286 {
 287         int e;
 288         struct thread *targettd;
 289         struct proc *targetp;
 290
 291         if (pid == 0) {
 292                 targettd = td;
 293                 targetp = td->td_proc;
 294                 PROC_LOCK(targetp);
 295         } else {
 296                 targetp = td->td_proc;
 297                 PROC_LOCK(targetp);
 298                 targettd = thread_find(targetp, pid);
 299                 if (targettd == NULL) {
 300                         PROC_UNLOCK(targetp);
 301                         return (ESRCH);
 302                 }
 303         }
 304
 305         e = p_cansee(td, targetp);
 306         if (e == 0)
 307                 e = ksched_rr_get_interval(ksched, targettd, ts);
 308         PROC_UNLOCK(targetp);
 309         return (e);
 310 }
 311
 312 #endif
 313
 314 static void
 315 p31binit(void *notused)
 316 {
 317         (void) sched_attach();
 318         p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
 319 }
 320
 321 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);