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 59 * not run-time supported. I am also logging since some programs 60 * start to use this when 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_proc->p_comm, 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 /* 111 * MPSAFE 112 */ 113 int 114 sched_setparam(struct thread *td, struct sched_setparam_args *uap) 115 { 116 struct thread *targettd; 117 struct proc *targetp; 118 int e; 119 struct sched_param sched_param; 120 121 e = copyin(uap->param, &sched_param, sizeof(sched_param)); 122 if (e) 123 return (e); 124 125 if (uap->pid == 0) { 126 targetp = td->td_proc; 127 targettd = td; 128 PROC_LOCK(targetp); 129 } else { 130 targetp = pfind(uap->pid); 131 if (targetp == NULL) 132 return (ESRCH); 133 targettd = FIRST_THREAD_IN_PROC(targetp); 134 } 135 136 e = p_cansched(td, targetp); 137 if (e == 0) { 138 e = ksched_setparam(ksched, targettd, 139 (const struct sched_param *)&sched_param); 140 } 141 PROC_UNLOCK(targetp); 142 return (e); 143 } 144 145 /* 146 * MPSAFE 147 */ 148 int 149 sched_getparam(struct thread *td, struct sched_getparam_args *uap) 150 { 151 int e; 152 struct sched_param sched_param; 153 struct thread *targettd; 154 struct proc *targetp; 155 156 if (uap->pid == 0) { 157 targetp = td->td_proc; 158 targettd = td; 159 PROC_LOCK(targetp); 160 } else { 161 targetp = pfind(uap->pid); 162 if (targetp == NULL) { 163 return (ESRCH); 164 } 165 targettd = FIRST_THREAD_IN_PROC(targetp); /* XXXKSE */ 166 } 167 168 e = p_cansee(td, targetp); 169 if (e == 0) { 170 e = ksched_getparam(ksched, targettd, &sched_param); 171 } 172 PROC_UNLOCK(targetp); 173 if (e == 0) 174 e = copyout(&sched_param, uap->param, sizeof(sched_param)); 175 return (e); 176 } 177 178 /* 179 * MPSAFE 180 */ 181 int 182 sched_setscheduler(struct thread *td, struct sched_setscheduler_args *uap) 183 { 184 int e; 185 struct sched_param sched_param; 186 struct thread *targettd; 187 struct proc *targetp; 188 189 /* Don't allow non root user to set a scheduler policy. */ 190 e = priv_check(td, PRIV_SCHED_SET); 191 if (e) 192 return (e); 193 194 e = copyin(uap->param, &sched_param, sizeof(sched_param)); 195 if (e) 196 return (e); 197 198 if (uap->pid == 0) { 199 targetp = td->td_proc; 200 targettd = td; 201 PROC_LOCK(targetp); 202 } else { 203 targetp = pfind(uap->pid); 204 if (targetp == NULL) 205 return (ESRCH); 206 targettd = FIRST_THREAD_IN_PROC(targetp); 207 } 208 209 e = p_cansched(td, targetp); 210 if (e == 0) { 211 e = ksched_setscheduler(ksched, targettd, 212 uap->policy, (const struct sched_param *)&sched_param); 213 } 214 PROC_UNLOCK(targetp); 215 return (e); 216 } 217 218 /* 219 * MPSAFE 220 */ 221 int 222 sched_getscheduler(struct thread *td, struct sched_getscheduler_args *uap) 223 { 224 int e, policy; 225 struct thread *targettd; 226 struct proc *targetp; 227 228 if (uap->pid == 0) { 229 targetp = td->td_proc; 230 targettd = td; 231 PROC_LOCK(targetp); 232 } else { 233 targetp = pfind(uap->pid); 234 if (targetp == NULL) { 235 e = ESRCH; 236 goto done2; 237 } 238 targettd = FIRST_THREAD_IN_PROC(targetp); /* XXXKSE */ 239 } 240 241 e = p_cansee(td, targetp); 242 if (e == 0) { 243 e = ksched_getscheduler(ksched, targettd, &policy); 244 td->td_retval[0] = policy; 245 } 246 PROC_UNLOCK(targetp); 247 248 done2: 249 return (e); 250 } 251 252 /* 253 * MPSAFE 254 */ 255 int 256 sched_yield(struct thread *td, struct sched_yield_args *uap) 257 { 258 259 return (ksched_yield(ksched)); 260 } 261 262 /* 263 * MPSAFE 264 */ 265 int 266 sched_get_priority_max(struct thread *td, 267 struct sched_get_priority_max_args *uap) 268 { 269 int error, prio; 270 271 error = ksched_get_priority_max(ksched, uap->policy, &prio); 272 td->td_retval[0] = prio; 273 return (error); 274 } 275 276 /* 277 * MPSAFE 278 */ 279 int 280 sched_get_priority_min(struct thread *td, 281 struct sched_get_priority_min_args *uap) 282 { 283 int error, prio; 284 285 error = ksched_get_priority_min(ksched, uap->policy, &prio); 286 td->td_retval[0] = prio; 287 return (error); 288 } 289 290 /* 291 * MPSAFE 292 */ 293 int 294 sched_rr_get_interval(struct thread *td, 295 struct sched_rr_get_interval_args *uap) 296 { 297 struct timespec timespec; 298 int error; 299 300 error = kern_sched_rr_get_interval(td, uap->pid, ×pec); 301 if (error == 0) 302 error = copyout(×pec, uap->interval, sizeof(timespec)); 303 return (error); 304 } 305 306 int 307 kern_sched_rr_get_interval(struct thread *td, pid_t pid, 308 struct timespec *ts) 309 { 310 int e; 311 struct thread *targettd; 312 struct proc *targetp; 313 314 if (pid == 0) { 315 targettd = td; 316 targetp = td->td_proc; 317 PROC_LOCK(targetp); 318 } else { 319 targetp = td->td_proc; 320 PROC_LOCK(targetp); 321 targettd = thread_find(targetp, pid); 322 if (targettd == NULL) { 323 PROC_UNLOCK(targetp); 324 return (ESRCH); 325 } 326 } 327 328 e = p_cansee(td, targetp); 329 if (e == 0) 330 e = ksched_rr_get_interval(ksched, targettd, ts); 331 PROC_UNLOCK(targetp); 332 return (e); 333 } 334 335 #endif 336 337 static void 338 p31binit(void *notused) 339 { 340 (void) sched_attach(); 341 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 342 } 343 344 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 345