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, 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, ×pec); 275 if (error == 0) 276 error = copyout(×pec, 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); 316