1 /* $NetBSD: freebsd_sched.c,v 1.23 2021/09/07 11:43:03 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center; by Matthias Scheler.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * FreeBSD compatibility module. Try to deal with scheduler related syscalls.
35 */
36
37 #include <sys/cdefs.h>
38 __KERNEL_RCSID(0, "$NetBSD: freebsd_sched.c,v 1.23 2021/09/07 11:43:03 riastradh Exp $");
39
40 #include <sys/param.h>
41 #include <sys/mount.h>
42 #include <sys/proc.h>
43 #include <sys/systm.h>
44 #include <sys/syscallargs.h>
45 #include <sys/kauth.h>
46
47 #include <sys/cpu.h>
48
49 #include <compat/freebsd/freebsd_syscallargs.h>
50 #include <compat/freebsd/freebsd_sched.h>
51
52 int
freebsd_sys_yield(struct lwp * l,const void * v,register_t * retval)53 freebsd_sys_yield(struct lwp *l, const void *v, register_t *retval)
54 {
55
56 yield();
57 return 0;
58 }
59
60 /*
61 * XXX: Needs adjustment to do a proper conversion.
62 */
63 static int
sched_freebsd2native(int freebsd_policy,const struct freebsd_sched_param * freebsd_params,int * native_policy,struct sched_param * native_params)64 sched_freebsd2native(int freebsd_policy,
65 const struct freebsd_sched_param *freebsd_params, int *native_policy,
66 struct sched_param *native_params)
67 {
68 int p;
69
70 switch (freebsd_policy) {
71 case FREEBSD_SCHED_OTHER:
72 p = SCHED_OTHER;
73 break;
74
75 case FREEBSD_SCHED_FIFO:
76 p = SCHED_FIFO;
77 break;
78
79 case FREEBSD_SCHED_RR:
80 p = SCHED_RR;
81 break;
82
83 default:
84 return EINVAL;
85 }
86
87 if (native_policy != NULL)
88 *native_policy = p;
89
90 if (freebsd_params != NULL && native_params != NULL) {
91 /* XXX: Needs adjustment to do a proper conversion. */
92 native_params->sched_priority = freebsd_params->sched_priority;
93 }
94 return 0;
95 }
96
97 static int
sched_native2freebsd(int native_policy,const struct sched_param * native_params,int * freebsd_policy,struct freebsd_sched_param * freebsd_params)98 sched_native2freebsd(int native_policy, const struct sched_param *native_params,
99 int *freebsd_policy, struct freebsd_sched_param *freebsd_params)
100 {
101 int p;
102
103 switch (native_policy) {
104 case SCHED_OTHER:
105 p = FREEBSD_SCHED_OTHER;
106 break;
107
108 case SCHED_FIFO:
109 p = FREEBSD_SCHED_FIFO;
110 break;
111
112 case SCHED_RR:
113 p = FREEBSD_SCHED_RR;
114 break;
115
116 default:
117 return EINVAL;
118 }
119
120 if (freebsd_policy != NULL)
121 *freebsd_policy = p;
122
123 if (native_params != NULL && freebsd_params != NULL) {
124 /* XXX: Needs adjustment to do a proper conversion. */
125 memset(freebsd_params, 0, sizeof(*freebsd_params));
126 freebsd_params->sched_priority = native_params->sched_priority;
127 }
128
129 return 0;
130 }
131
132 int
freebsd_sys_sched_setparam(struct lwp * l,const struct freebsd_sys_sched_setparam_args * uap,register_t * retval)133 freebsd_sys_sched_setparam(struct lwp *l, const struct freebsd_sys_sched_setparam_args *uap, register_t *retval)
134 {
135 /* {
136 syscallarg(pid_t) pid;
137 syscallarg(const struct freebsd_sched_param *) sp;
138 } */
139 int error, policy;
140 struct freebsd_sched_param lp;
141 struct sched_param sp;
142
143 if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
144 error = EINVAL;
145 goto out;
146 }
147
148 error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
149 if (error)
150 goto out;
151
152 /* We need the current policy in FreeBSD terms. */
153 error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
154 if (error)
155 goto out;
156 error = sched_native2freebsd(policy, NULL, &policy, NULL);
157 if (error)
158 goto out;
159
160 error = sched_freebsd2native(policy, &lp, &policy, &sp);
161 if (error)
162 goto out;
163
164 error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
165 if (error)
166 goto out;
167
168 out:
169 return error;
170 }
171
172 int
freebsd_sys_sched_getparam(struct lwp * l,const struct freebsd_sys_sched_getparam_args * uap,register_t * retval)173 freebsd_sys_sched_getparam(struct lwp *l, const struct freebsd_sys_sched_getparam_args *uap, register_t *retval)
174 {
175 /* {
176 syscallarg(pid_t) pid;
177 syscallarg(struct freebsd_sched_param *) sp;
178 } */
179 struct freebsd_sched_param lp;
180 struct sched_param sp;
181 int error;
182
183 if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
184 error = EINVAL;
185 goto out;
186 }
187
188 error = do_sched_getparam(SCARG(uap, pid), 0, NULL, &sp);
189 if (error)
190 goto out;
191
192 error = sched_native2freebsd(0, &sp, NULL, &lp);
193 if (error)
194 goto out;
195
196 error = copyout(&lp, SCARG(uap, sp), sizeof(lp));
197 if (error)
198 goto out;
199
200 out:
201 return error;
202 }
203
204 int
freebsd_sys_sched_setscheduler(struct lwp * l,const struct freebsd_sys_sched_setscheduler_args * uap,register_t * retval)205 freebsd_sys_sched_setscheduler(struct lwp *l, const struct freebsd_sys_sched_setscheduler_args *uap, register_t *retval)
206 {
207 /* {
208 syscallarg(pid_t) pid;
209 syscallarg(int) policy;
210 syscallarg(cont struct freebsd_sched_scheduler *) sp;
211 } */
212 int error, policy;
213 struct freebsd_sched_param lp;
214 struct sched_param sp;
215
216 if (SCARG(uap, pid) < 0 || SCARG(uap, sp) == NULL) {
217 error = EINVAL;
218 goto out;
219 }
220
221 error = copyin(SCARG(uap, sp), &lp, sizeof(lp));
222 if (error)
223 goto out;
224
225 error = sched_freebsd2native(SCARG(uap, policy), &lp, &policy, &sp);
226 if (error)
227 goto out;
228
229 error = do_sched_setparam(SCARG(uap, pid), 0, policy, &sp);
230 if (error)
231 goto out;
232
233 out:
234 return error;
235 }
236
237 int
freebsd_sys_sched_getscheduler(struct lwp * l,const struct freebsd_sys_sched_getscheduler_args * uap,register_t * retval)238 freebsd_sys_sched_getscheduler(struct lwp *l, const struct freebsd_sys_sched_getscheduler_args *uap, register_t *retval)
239 {
240 /* {
241 syscallarg(pid_t) pid;
242 } */
243 int error, policy;
244
245 *retval = -1;
246
247 error = do_sched_getparam(SCARG(uap, pid), 0, &policy, NULL);
248 if (error)
249 goto out;
250
251 error = sched_native2freebsd(policy, NULL, &policy, NULL);
252 if (error)
253 goto out;
254
255 *retval = policy;
256
257 out:
258 return error;
259 }
260
261 int
freebsd_sys_sched_yield(struct lwp * l,const void * v,register_t * retval)262 freebsd_sys_sched_yield(struct lwp *l, const void *v, register_t *retval)
263 {
264
265 yield();
266 return 0;
267 }
268
269 int
freebsd_sys_sched_get_priority_max(struct lwp * l,const struct freebsd_sys_sched_get_priority_max_args * uap,register_t * retval)270 freebsd_sys_sched_get_priority_max(struct lwp *l, const struct freebsd_sys_sched_get_priority_max_args *uap, register_t *retval)
271 {
272 /* {
273 syscallarg(int) policy;
274 } */
275
276 /*
277 * We can't emulate anything put the default scheduling policy.
278 */
279 if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) {
280 *retval = -1;
281 return EINVAL;
282 }
283
284 *retval = 0;
285 return 0;
286 }
287
288 int
freebsd_sys_sched_get_priority_min(struct lwp * l,const struct freebsd_sys_sched_get_priority_min_args * uap,register_t * retval)289 freebsd_sys_sched_get_priority_min(struct lwp *l, const struct freebsd_sys_sched_get_priority_min_args *uap, register_t *retval)
290 {
291 /* {
292 syscallarg(int) policy;
293 } */
294
295 /*
296 * We can't emulate anything put the default scheduling policy.
297 */
298 if (SCARG(uap, policy) != FREEBSD_SCHED_OTHER) {
299 *retval = -1;
300 return EINVAL;
301 }
302
303 *retval = 0;
304 return 0;
305 }
306