1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 * Copyright (c) 2015 Joyent, Inc.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30
31 #include <sys/types.h>
32 #include <sys/bitmap.h>
33 #include <sys/sysmacros.h>
34 #include <sys/kmem.h>
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/user.h>
38 #include <sys/unistd.h>
39 #include <sys/errno.h>
40 #include <sys/proc.h>
41 #include <sys/mman.h>
42 #include <sys/tuneable.h>
43 #include <sys/cmn_err.h>
44 #include <sys/cred.h>
45 #include <sys/vmsystm.h>
46 #include <sys/debug.h>
47 #include <sys/policy.h>
48
49 #include <vm/as.h>
50 #include <vm/seg.h>
51
52 static uint_t mem_getpgszc(size_t);
53
54 /*
55 * Memory control operations
56 */
57 int
58 memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg, int attr, int mask)
59 {
60 struct as *as = ttoproc(curthread)->p_as;
61 struct proc *p = ttoproc(curthread);
62 size_t pgsz;
63 uint_t szc, oszc, pgcmd;
64 int error = 0;
65 faultcode_t fc;
66 uintptr_t iarg;
67 STRUCT_DECL(memcntl_mha, mha);
68
69 if (mask)
70 return (set_errno(EINVAL));
71 if ((cmd == MC_LOCKAS) || (cmd == MC_UNLOCKAS)) {
72 if ((addr != 0) || (len != 0)) {
73 return (set_errno(EINVAL));
74 }
75 } else if (cmd != MC_HAT_ADVISE) {
76 if (((uintptr_t)addr & PAGEOFFSET) != 0 || len == 0) {
77 return (set_errno(EINVAL));
78 }
79 /*
80 * We're only concerned with the address range
81 * here, not the protections. The protections
82 * are only used as a "filter" in this code,
83 * they aren't set or modified here.
84 */
85 if (valid_usr_range(addr, len, 0, as,
86 as->a_userlimit) != RANGE_OKAY) {
87 return (set_errno(ENOMEM));
88 }
89 }
90
91 if (cmd == MC_HAT_ADVISE) {
92 if (attr != 0 || mask != 0) {
93 return (set_errno(EINVAL));
94 }
95
96 } else {
97 if ((VALID_ATTR & attr) != attr) {
98 return (set_errno(EINVAL));
99 }
100 if ((attr & SHARED) && (attr & PRIVATE)) {
101 return (set_errno(EINVAL));
102 }
103 if (((cmd == MC_LOCKAS) || (cmd == MC_LOCK) ||
104 (cmd == MC_UNLOCKAS) || (cmd == MC_UNLOCK)) &&
105 (error = secpolicy_lock_memory(CRED())) != 0)
106 return (set_errno(error));
107 }
108 if (attr) {
109 attr |= PROT_USER;
110 }
111
112 switch (cmd) {
113 case MC_SYNC:
114 /*
115 * MS_SYNC used to be defined to be zero but is now non-zero.
116 * For binary compatibility we still accept zero
117 * (the absence of MS_ASYNC) to mean the same thing.
118 */
119 iarg = (uintptr_t)arg;
120 if ((iarg & ~MS_INVALIDATE) == 0)
121 iarg |= MS_SYNC;
122
123 if (((iarg & ~(MS_SYNC|MS_ASYNC|MS_INVALIDATE)) != 0) ||
124 ((iarg & (MS_SYNC|MS_ASYNC)) == (MS_SYNC|MS_ASYNC))) {
125 error = set_errno(EINVAL);
126 } else {
127 error = as_ctl(as, addr, len, cmd, attr, iarg, NULL, 0);
128 if (error) {
129 (void) set_errno(error);
130 }
131 }
132 return (error);
133 case MC_LOCKAS:
134 if ((uintptr_t)arg & ~(MCL_FUTURE|MCL_CURRENT) ||
135 (uintptr_t)arg == 0) {
136 return (set_errno(EINVAL));
137 }
138 break;
139 case MC_LOCK:
140 case MC_UNLOCKAS:
141 case MC_UNLOCK:
142 break;
143 case MC_HAT_ADVISE:
144 /*
145 * Set prefered page size.
146 */
147 STRUCT_INIT(mha, get_udatamodel());
148 if (copyin(arg, STRUCT_BUF(mha), STRUCT_SIZE(mha))) {
149 return (set_errno(EFAULT));
150 }
151
152 pgcmd = STRUCT_FGET(mha, mha_cmd);
153
154 /*
155 * Currently only MHA_MAPSIZE_VA, MHA_MAPSIZE_STACK
156 * and MHA_MAPSIZE_BSSBRK are supported. Only one
157 * command may be specified at a time.
158 */
159 if ((~(MHA_MAPSIZE_VA|MHA_MAPSIZE_STACK|MHA_MAPSIZE_BSSBRK) &
160 pgcmd) || pgcmd == 0 || !ISP2(pgcmd) ||
161 STRUCT_FGET(mha, mha_flags))
162 return (set_errno(EINVAL));
163
164 pgsz = STRUCT_FGET(mha, mha_pagesize);
165
166 /*
167 * call platform specific map_pgsz() routine to get the
168 * optimal pgsz if pgsz is 0.
169 *
170 * For stack and heap operations addr and len must be zero.
171 */
172 if ((pgcmd & (MHA_MAPSIZE_BSSBRK|MHA_MAPSIZE_STACK)) != 0) {
173 if (addr != NULL || len != 0) {
174 return (set_errno(EINVAL));
175 }
176
177 /*
178 * Disable autompss for this process unless pgsz == 0,
179 * which means the system should pick. In the
180 * pgsz == 0 case, leave the SAUTOLPG setting alone, as
181 * we don't want to enable it when someone has
182 * disabled automatic large page selection for the
183 * whole system.
184 */
185 mutex_enter(&p->p_lock);
186 if (pgsz != 0) {
187 p->p_flag &= ~SAUTOLPG;
188 }
189 mutex_exit(&p->p_lock);
190
191 as_rangelock(as);
192
193 if (pgsz == 0) {
194 int type;
195
196 if (pgcmd == MHA_MAPSIZE_BSSBRK)
197 type = MAPPGSZ_HEAP;
198 else
199 type = MAPPGSZ_STK;
200
201 pgsz = map_pgsz(type, p, 0, 0, 1);
202 }
203 } else {
204 /*
205 * addr and len must be valid for range specified.
206 */
207 if (valid_usr_range(addr, len, 0, as,
208 as->a_userlimit) != RANGE_OKAY) {
209 return (set_errno(ENOMEM));
210 }
211 /*
212 * Note that we don't disable automatic large page
213 * selection for anon segments based on use of
214 * memcntl().
215 */
216 if (pgsz == 0) {
217 error = as_set_default_lpsize(as, addr, len);
218 if (error) {
219 (void) set_errno(error);
220 }
221 return (error);
222 }
223
224 /*
225 * addr and len must be prefered page size aligned
226 */
227 if (!IS_P2ALIGNED(addr, pgsz) ||
228 !IS_P2ALIGNED(len, pgsz)) {
229 return (set_errno(EINVAL));
230 }
231 }
232
233 szc = mem_getpgszc(pgsz);
234 if (szc == (uint_t)-1) {
235 if ((pgcmd & (MHA_MAPSIZE_BSSBRK|MHA_MAPSIZE_STACK))
236 != 0) {
237 as_rangeunlock(as);
238 }
239 return (set_errno(EINVAL));
240 }
241
242 /*
243 * For stack and heap operations we first need to pad
244 * out existing range (create new mappings) to the new
245 * prefered page size boundary. Also the start of the
246 * .bss for the heap or user's stack base may not be on
247 * the new prefered page size boundary. For these cases
248 * we align the base of the request on the new prefered
249 * page size.
250 */
251 if (pgcmd & MHA_MAPSIZE_BSSBRK) {
252 if (szc == p->p_brkpageszc) {
253 as_rangeunlock(as);
254 return (0);
255 }
256 if (szc > p->p_brkpageszc) {
257 error = brk_internal(p->p_brkbase
258 + p->p_brksize, szc);
259 if (error) {
260 as_rangeunlock(as);
261 return (set_errno(error));
262 }
263 }
264 /*
265 * It is possible for brk_internal to silently fail to
266 * promote the heap size, so don't panic or ASSERT.
267 */
268 if (!IS_P2ALIGNED(p->p_brkbase + p->p_brksize, pgsz)) {
269 as_rangeunlock(as);
270 return (set_errno(ENOMEM));
271 }
272 oszc = p->p_brkpageszc;
273 p->p_brkpageszc = szc;
274
275 addr = (caddr_t)P2ROUNDUP((uintptr_t)p->p_bssbase,
276 pgsz);
277 len = (p->p_brkbase + p->p_brksize) - addr;
278 ASSERT(IS_P2ALIGNED(len, pgsz));
279 /*
280 * Perhaps no existing pages to promote.
281 */
282 if (len == 0) {
283 as_rangeunlock(as);
284 return (0);
285 }
286 }
287 /*
288 * The code below, as does grow.c, assumes stacks always grow
289 * downward.
290 */
291 if (pgcmd & MHA_MAPSIZE_STACK) {
292 if (szc == p->p_stkpageszc) {
293 as_rangeunlock(as);
294 return (0);
295 }
296
297 if (szc > p->p_stkpageszc) {
298 error = grow_internal(p->p_usrstack -
299 p->p_stksize, szc);
300 if (error) {
301 as_rangeunlock(as);
302 return (set_errno(error));
303 }
304 }
305 /*
306 * It is possible for grow_internal to silently fail to
307 * promote the stack size, so don't panic or ASSERT.
308 */
309 if (!IS_P2ALIGNED(p->p_usrstack - p->p_stksize, pgsz)) {
310 as_rangeunlock(as);
311 return (set_errno(ENOMEM));
312 }
313 oszc = p->p_stkpageszc;
314 p->p_stkpageszc = szc;
315
316 addr = p->p_usrstack - p->p_stksize;
317 len = P2ALIGN(p->p_stksize, pgsz);
318
319 /*
320 * Perhaps nothing to promote.
321 */
322 if (len == 0 || addr >= p->p_usrstack ||
323 (addr + len) < addr) {
324 as_rangeunlock(as);
325 return (0);
326 }
327 }
328 ASSERT(IS_P2ALIGNED(addr, pgsz));
329 ASSERT(IS_P2ALIGNED(len, pgsz));
330 error = as_setpagesize(as, addr, len, szc, B_TRUE);
331
332 /*
333 * On stack or heap failures restore original
334 * pg size code.
335 */
336 if (error) {
337 if ((pgcmd & MHA_MAPSIZE_BSSBRK) != 0) {
338 p->p_brkpageszc = oszc;
339 }
340 if ((pgcmd & MHA_MAPSIZE_STACK) != 0) {
341 p->p_stkpageszc = oszc;
342 }
343 (void) set_errno(error);
344 }
345 if ((pgcmd & (MHA_MAPSIZE_BSSBRK|MHA_MAPSIZE_STACK)) != 0) {
346 as_rangeunlock(as);
347 }
348 return (error);
349 case MC_ADVISE:
350 if ((uintptr_t)arg == MADV_FREE ||
351 (uintptr_t)arg == MADV_PURGE) {
352 len &= PAGEMASK;
353 }
354 switch ((uintptr_t)arg) {
355 case MADV_WILLNEED:
356 fc = as_faulta(as, addr, len);
357 if (fc) {
358 if (FC_CODE(fc) == FC_OBJERR)
359 error = set_errno(FC_ERRNO(fc));
360 else if (FC_CODE(fc) == FC_NOMAP)
361 error = set_errno(ENOMEM);
362 else
363 error = set_errno(EINVAL);
364 return (error);
365 }
366 break;
367
368 case MADV_DONTNEED:
369 /*
370 * For now, don't need is turned into an as_ctl(MC_SYNC)
371 * operation flagged for async invalidate.
372 */
373 error = as_ctl(as, addr, len, MC_SYNC, attr,
374 MS_ASYNC | MS_INVALIDATE, NULL, 0);
375 if (error)
376 (void) set_errno(error);
377 return (error);
378
379 default:
380 error = as_ctl(as, addr, len, cmd, attr,
381 (uintptr_t)arg, NULL, 0);
382 if (error)
383 (void) set_errno(error);
384 return (error);
385 }
386 break;
387 case MC_INHERIT_ZERO:
388 if (arg != 0 || attr != 0 || mask != 0)
389 return (set_errno(EINVAL));
390 break;
391 default:
392 return (set_errno(EINVAL));
393 }
394
395 error = as_ctl(as, addr, len, cmd, attr, (uintptr_t)arg, NULL, 0);
396
397 if (error)
398 (void) set_errno(error);
399 return (error);
400 }
401
402 /*
403 * Return page size code for page size passed in. If
404 * matching page size not found or supported, return -1.
405 */
406 static uint_t
407 mem_getpgszc(size_t pgsz) {
408 return ((uint_t)page_szc_user_filtered(pgsz));
409 }