Allow kernel to be compile without _KPOSIX_PRIORITY_SCHEDULING.
[dragonfly.git] / sys / kern / kern_p1003_1b.c
... / ...
CommitLineData
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 * $FreeBSD: src/sys/posix4/p1003_1b.c,v 1.5.2.2 2003/03/25 06:13:35 rwatson Exp $
33 * $DragonFly: src/sys/kern/kern_p1003_1b.c,v 1.10 2007/06/26 19:31:08 dillon Exp $
34 */
35
36/* p1003_1b: Real Time common code.
37 */
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/kernel.h>
42#include <sys/sysent.h>
43#include <sys/posix4.h>
44#include <sys/proc.h>
45#include <sys/syslog.h>
46#include <sys/module.h>
47#include <sys/sysproto.h>
48#include <sys/sysctl.h>
49#include <sys/unistd.h>
50
51#include <sys/mplock2.h>
52
53MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
54
55/* p31b_proc: Return a proc struct corresponding to a pid to operate on.
56 *
57 * Enforce permission policy.
58 *
59 * The policy is the same as for sending signals except there
60 * is no notion of process groups.
61 *
62 * pid == 0 means my process.
63 *
64 * This is disabled until I've got a permission gate in again:
65 * only root can do this.
66 */
67
68#if 0
69/*
70 * This is stolen from CANSIGNAL in kern_sig:
71 *
72 * Can process p, with pcred pc, do "write flavor" operations to process q?
73 */
74#define CAN_AFFECT(p, cr, q) \
75 ((cr)->cr_uid == 0 || \
76 (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \
77 (cr)->cr_uid == (q)->p_ucred->cr_ruid || \
78 (cr)->cr_ruid == (q)->p_ucred->cr_uid || \
79 (cr)->cr_uid == (q)->p_ucred->cr_uid)
80#else
81#define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0)
82#endif
83
84/*
85 * p31b_proc: Look up a proc from a PID. If proc is 0 it is
86 * my own proc.
87 */
88int p31b_proc(struct proc *p, pid_t pid, struct proc **pp)
89{
90 int ret = 0;
91 struct proc *other_proc = 0;
92
93 if (pid == 0)
94 other_proc = p;
95 else
96 other_proc = pfind(pid);
97
98 if (other_proc)
99 {
100 /* Enforce permission policy.
101 */
102 if (CAN_AFFECT(p, p->p_ucred, other_proc))
103 *pp = other_proc;
104 else
105 ret = EPERM;
106 }
107 else
108 ret = ESRCH;
109
110 return ret;
111}
112
113
114#if !defined(_KPOSIX_PRIORITY_SCHEDULING)
115
116int syscall_not_present(const char *s);
117
118/* The system calls return ENOSYS if an entry is called that is
119 * not run-time supported. I am also logging since some programs
120 * start to use this when they shouldn't. That will be removed if annoying.
121 */
122int syscall_not_present(const char *s)
123{
124 struct proc *p = curproc;
125 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
126 p->p_comm, p->p_pid, s);
127
128 /* a " return nosys(p, uap); " here causes a core dump.
129 */
130
131 return ENOSYS;
132}
133
134/* Not configured but loadable via a module:
135 */
136
137static int sched_attach(void)
138{
139 return 0;
140}
141
142#define SYSCALL_NOT_PRESENT_GEN(SC) \
143int sys_##SC (struct SC##_args *uap) \
144{ \
145 return syscall_not_present(#SC); \
146}
147
148SYSCALL_NOT_PRESENT_GEN(sched_setparam)
149SYSCALL_NOT_PRESENT_GEN(sched_getparam)
150SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
151SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
152SYSCALL_NOT_PRESENT_GEN(sched_yield)
153SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
154SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
155SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
156
157#else
158
159/* Configured in kernel version:
160 */
161static struct ksched *ksched;
162
163static int sched_attach(void)
164{
165 int ret = ksched_attach(&ksched);
166
167 if (ret == 0)
168 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
169
170 return ret;
171}
172
173/*
174 * MPALMOSTSAFE
175 */
176int
177sys_sched_setparam(struct sched_setparam_args *uap)
178{
179 struct proc *p = curproc;
180 struct lwp *lp;
181 int e;
182 struct sched_param sched_param;
183
184 copyin(uap->param, &sched_param, sizeof(sched_param));
185
186 get_mplock();
187 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
188 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
189 e = ksched_setparam(&uap->sysmsg_reg, ksched, lp,
190 (const struct sched_param *)&sched_param);
191 }
192 rel_mplock();
193 return e;
194}
195
196/*
197 * MPALMOSTSAFE
198 */
199int
200sys_sched_getparam(struct sched_getparam_args *uap)
201{
202 struct proc *p = curproc;
203 struct proc *targetp;
204 struct lwp *lp;
205 struct sched_param sched_param;
206 int e;
207
208 get_mplock();
209 if (uap->pid != 0 && uap->pid != p->p_pid) {
210 e = p31b_proc(p, uap->pid, &targetp);
211 if (e)
212 goto done;
213 } else {
214 targetp = p;
215 }
216
217 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
218 e = ksched_getparam(&uap->sysmsg_reg, ksched, lp, &sched_param);
219done:
220 rel_mplock();
221 if (e == 0)
222 copyout(&sched_param, uap->param, sizeof(sched_param));
223 return e;
224}
225
226/*
227 * MPALMOSTSAFE
228 */
229int
230sys_sched_setscheduler(struct sched_setscheduler_args *uap)
231{
232 struct proc *p = curproc;
233 struct lwp *lp;
234 int e;
235 struct sched_param sched_param;
236
237 copyin(uap->param, &sched_param, sizeof(sched_param));
238
239 get_mplock();
240 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
241 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
242 e = ksched_setscheduler(&uap->sysmsg_reg, ksched, lp,
243 uap->policy,
244 (const struct sched_param *)&sched_param);
245 }
246 rel_mplock();
247 return e;
248}
249
250/*
251 * MPALMOSTSAFE
252 */
253int
254sys_sched_getscheduler(struct sched_getscheduler_args *uap)
255{
256 struct proc *p = curproc;
257 struct proc *targetp;
258 struct lwp *lp;
259 int e;
260
261 get_mplock();
262 if (uap->pid != 0 && uap->pid != p->p_pid) {
263 e = p31b_proc(p, uap->pid, &targetp);
264 if (e)
265 goto done;
266 } else {
267 targetp = p;
268 }
269
270 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
271 e = ksched_getscheduler(&uap->sysmsg_reg, ksched, lp);
272done:
273 rel_mplock();
274 return e;
275}
276
277/*
278 * MPSAFE
279 */
280int
281sys_sched_yield(struct sched_yield_args *uap)
282{
283 return ksched_yield(&uap->sysmsg_reg, ksched);
284}
285
286/*
287 * MPSAFE
288 */
289int
290sys_sched_get_priority_max(struct sched_get_priority_max_args *uap)
291{
292 return ksched_get_priority_max(&uap->sysmsg_reg, ksched, uap->policy);
293}
294
295/*
296 * MPSAFE
297 */
298int
299sys_sched_get_priority_min(struct sched_get_priority_min_args *uap)
300{
301 return ksched_get_priority_min(&uap->sysmsg_reg, ksched, uap->policy);
302}
303
304/*
305 * MPALMOSTSAFE
306 */
307int
308sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap)
309{
310 int e;
311 struct proc *p = curproc;
312 struct lwp *lp = curthread->td_lwp;
313 struct timespec ts;
314
315 get_mplock();
316 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
317 e = ksched_rr_get_interval(&uap->sysmsg_reg, ksched, lp, &ts);
318 if (e == 0)
319 e = copyout(&ts, uap->interval, sizeof(ts));
320 }
321 rel_mplock();
322 return e;
323}
324
325#endif
326
327static void
328p31binit(void *notused)
329{
330 (void) sched_attach();
331 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
332 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, -1);
333 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
334}
335
336SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);