1/*-
2 * Copyright (c) 2002-2006 Rice University
3 * Copyright (c) 2007 Alan L. Cox <alc@cs.rice.edu>
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Alan L. Cox,
7 * Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
28 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Physical memory system implementation
34 *
35 * Any external functions defined by this module are only to be used by the
36 * virtual memory system.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: stable/10/sys/vm/vm_phys.c 276546 2015-01-02 17:45:52Z alc $");
41
42#include "opt_ddb.h"
43#include "opt_vm.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/lock.h>
48#include <sys/kernel.h>
49#include <sys/malloc.h>
50#include <sys/mutex.h>
51#if MAXMEMDOM > 1
52#include <sys/proc.h>
53#endif
54#include <sys/queue.h>
55#include <sys/sbuf.h>
56#include <sys/sysctl.h>
57#include <sys/vmmeter.h>
58
59#include <ddb/ddb.h>
60
61#include <vm/vm.h>
62#include <vm/vm_param.h>
63#include <vm/vm_kern.h>
64#include <vm/vm_object.h>
65#include <vm/vm_page.h>
66#include <vm/vm_phys.h>
67
68_Static_assert(sizeof(long) * NBBY >= VM_PHYSSEG_MAX,
69 "Too many physsegs.");
70
71struct mem_affinity *mem_affinity;
72
73int vm_ndomains = 1;
74
75struct vm_phys_seg vm_phys_segs[VM_PHYSSEG_MAX];
76int vm_phys_nsegs;
77
78#define VM_PHYS_FICTITIOUS_NSEGS 8
79static struct vm_phys_fictitious_seg {
80 vm_paddr_t start;
81 vm_paddr_t end;
82 vm_page_t first_page;
83} vm_phys_fictitious_segs[VM_PHYS_FICTITIOUS_NSEGS];
84static struct mtx vm_phys_fictitious_reg_mtx;
85MALLOC_DEFINE(M_FICT_PAGES, "vm_fictitious", "Fictitious VM pages");
86
87static struct vm_freelist
88 vm_phys_free_queues[MAXMEMDOM][VM_NFREELIST][VM_NFREEPOOL][VM_NFREEORDER];
89
90static int vm_nfreelists = VM_FREELIST_DEFAULT + 1;
91
92static int cnt_prezero;
93SYSCTL_INT(_vm_stats_misc, OID_AUTO, cnt_prezero, CTLFLAG_RD,
94 &cnt_prezero, 0, "The number of physical pages prezeroed at idle time");
95
96static int sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS);
97SYSCTL_OID(_vm, OID_AUTO, phys_free, CTLTYPE_STRING | CTLFLAG_RD,
98 NULL, 0, sysctl_vm_phys_free, "A", "Phys Free Info");
99
100static int sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS);
101SYSCTL_OID(_vm, OID_AUTO, phys_segs, CTLTYPE_STRING | CTLFLAG_RD,
102 NULL, 0, sysctl_vm_phys_segs, "A", "Phys Seg Info");
103
104SYSCTL_INT(_vm, OID_AUTO, ndomains, CTLFLAG_RD,
105 &vm_ndomains, 0, "Number of physical memory domains available.");
106
107static vm_page_t vm_phys_alloc_domain_pages(int domain, int flind, int pool,
108 int order);
109static void _vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind,
110 int domain);
111static void vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind);
112static int vm_phys_paddr_to_segind(vm_paddr_t pa);
113static void vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl,
114 int order);
115
116static __inline int
117vm_rr_selectdomain(void)
118{
119#if MAXMEMDOM > 1
120 struct thread *td;
121
122 td = curthread;
123
124 td->td_dom_rr_idx++;
125 td->td_dom_rr_idx %= vm_ndomains;
126 return (td->td_dom_rr_idx);
127#else
128 return (0);
129#endif
130}
131
132boolean_t
133vm_phys_domain_intersects(long mask, vm_paddr_t low, vm_paddr_t high)
134{
135 struct vm_phys_seg *s;
136 int idx;
137
138 while ((idx = ffsl(mask)) != 0) {
139 idx--; /* ffsl counts from 1 */
140 mask &= ~(1UL << idx);
141 s = &vm_phys_segs[idx];
142 if (low < s->end && high > s->start)
143 return (TRUE);
144 }
145 return (FALSE);
146}
147
148/*
149 * Outputs the state of the physical memory allocator, specifically,
150 * the amount of physical memory in each free list.
151 */
152static int
153sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS)
154{
155 struct sbuf sbuf;
156 struct vm_freelist *fl;
157 int dom, error, flind, oind, pind;
158
159 error = sysctl_wire_old_buffer(req, 0);
160 if (error != 0)
161 return (error);
162 sbuf_new_for_sysctl(&sbuf, NULL, 128 * vm_ndomains, req);
163 for (dom = 0; dom < vm_ndomains; dom++) {
164 sbuf_printf(&sbuf,"\nDOMAIN %d:\n", dom);
165 for (flind = 0; flind < vm_nfreelists; flind++) {
166 sbuf_printf(&sbuf, "\nFREE LIST %d:\n"
167 "\n ORDER (SIZE) | NUMBER"
168 "\n ", flind);
169 for (pind = 0; pind < VM_NFREEPOOL; pind++)
170 sbuf_printf(&sbuf, " | POOL %d", pind);
171 sbuf_printf(&sbuf, "\n-- ");
172 for (pind = 0; pind < VM_NFREEPOOL; pind++)
173 sbuf_printf(&sbuf, "-- -- ");
174 sbuf_printf(&sbuf, "--\n");
175 for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
176 sbuf_printf(&sbuf, " %2d (%6dK)", oind,
177 1 << (PAGE_SHIFT - 10 + oind));
178 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
179 fl = vm_phys_free_queues[dom][flind][pind];
180 sbuf_printf(&sbuf, " | %6d",
181 fl[oind].lcnt);
182 }
183 sbuf_printf(&sbuf, "\n");
184 }
185 }
186 }
187 error = sbuf_finish(&sbuf);
188 sbuf_delete(&sbuf);
189 return (error);
190}
191
192/*
193 * Outputs the set of physical memory segments.
194 */
195static int
196sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS)
197{
198 struct sbuf sbuf;
199 struct vm_phys_seg *seg;
200 int error, segind;
201
202 error = sysctl_wire_old_buffer(req, 0);
203 if (error != 0)
204 return (error);
205 sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
206 for (segind = 0; segind < vm_phys_nsegs; segind++) {
207 sbuf_printf(&sbuf, "\nSEGMENT %d:\n\n", segind);
208 seg = &vm_phys_segs[segind];
209 sbuf_printf(&sbuf, "start: %#jx\n",
210 (uintmax_t)seg->start);
211 sbuf_printf(&sbuf, "end: %#jx\n",
212 (uintmax_t)seg->end);
213 sbuf_printf(&sbuf, "domain: %d\n", seg->domain);
214 sbuf_printf(&sbuf, "free list: %p\n", seg->free_queues);
215 }
216 error = sbuf_finish(&sbuf);
217 sbuf_delete(&sbuf);
218 return (error);
219}
220
221static void
222vm_freelist_add(struct vm_freelist *fl, vm_page_t m, int order, int tail)
223{
224
225 m->order = order;
226 if (tail)
227 TAILQ_INSERT_TAIL(&fl[order].pl, m, plinks.q);
228 else
229 TAILQ_INSERT_HEAD(&fl[order].pl, m, plinks.q);
230 fl[order].lcnt++;
231}
232
233static void
234vm_freelist_rem(struct vm_freelist *fl, vm_page_t m, int order)
235{
236
237 TAILQ_REMOVE(&fl[order].pl, m, plinks.q);
238 fl[order].lcnt--;
239 m->order = VM_NFREEORDER;
240}
241
242/*
243 * Create a physical memory segment.
244 */
245static void
246_vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind, int domain)
247{
248 struct vm_phys_seg *seg;
249
250 KASSERT(vm_phys_nsegs < VM_PHYSSEG_MAX,
251 ("vm_phys_create_seg: increase VM_PHYSSEG_MAX"));
252 KASSERT(domain < vm_ndomains,
253 ("vm_phys_create_seg: invalid domain provided"));
254 seg = &vm_phys_segs[vm_phys_nsegs++];
255 while (seg > vm_phys_segs && (seg - 1)->start >= end) {
256 *seg = *(seg - 1);
257 seg--;
258 }
259 seg->start = start;
260 seg->end = end;
261 seg->domain = domain;
262 seg->free_queues = &vm_phys_free_queues[domain][flind];
263}
264
265static void
266vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind)
267{
268 int i;
269
270 if (mem_affinity == NULL) {
271 _vm_phys_create_seg(start, end, flind, 0);
272 return;
273 }
274
275 for (i = 0;; i++) {
276 if (mem_affinity[i].end == 0)
277 panic("Reached end of affinity info");
278 if (mem_affinity[i].end <= start)
279 continue;
280 if (mem_affinity[i].start > start)
281 panic("No affinity info for start %jx",
282 (uintmax_t)start);
283 if (mem_affinity[i].end >= end) {
284 _vm_phys_create_seg(start, end, flind,
285 mem_affinity[i].domain);
286 break;
287 }
288 _vm_phys_create_seg(start, mem_affinity[i].end, flind,
289 mem_affinity[i].domain);
290 start = mem_affinity[i].end;
291 }
292}
293
294/*
295 * Add a physical memory segment.
296 */
297void
298vm_phys_add_seg(vm_paddr_t start, vm_paddr_t end)
299{
300
301 KASSERT((start & PAGE_MASK) == 0,
302 ("vm_phys_define_seg: start is not page aligned"));
303 KASSERT((end & PAGE_MASK) == 0,
304 ("vm_phys_define_seg: end is not page aligned"));
305#ifdef VM_FREELIST_ISADMA
306 if (start < 16777216) {
307 if (end > 16777216) {
308 vm_phys_create_seg(start, 16777216,
309 VM_FREELIST_ISADMA);
310 vm_phys_create_seg(16777216, end, VM_FREELIST_DEFAULT);
311 } else
312 vm_phys_create_seg(start, end, VM_FREELIST_ISADMA);
313 if (VM_FREELIST_ISADMA >= vm_nfreelists)
314 vm_nfreelists = VM_FREELIST_ISADMA + 1;
315 } else
316#endif
317#ifdef VM_FREELIST_HIGHMEM
318 if (end > VM_HIGHMEM_ADDRESS) {
319 if (start < VM_HIGHMEM_ADDRESS) {
320 vm_phys_create_seg(start, VM_HIGHMEM_ADDRESS,
321 VM_FREELIST_DEFAULT);
322 vm_phys_create_seg(VM_HIGHMEM_ADDRESS, end,
323 VM_FREELIST_HIGHMEM);
324 } else
325 vm_phys_create_seg(start, end, VM_FREELIST_HIGHMEM);
326 if (VM_FREELIST_HIGHMEM >= vm_nfreelists)
327 vm_nfreelists = VM_FREELIST_HIGHMEM + 1;
328 } else
329#endif
330 vm_phys_create_seg(start, end, VM_FREELIST_DEFAULT);
331}
332
333/*
334 * Initialize the physical memory allocator.
335 */
336void
337vm_phys_init(void)
338{
339 struct vm_freelist *fl;
340 struct vm_phys_seg *seg;
341#ifdef VM_PHYSSEG_SPARSE
342 long pages;
343#endif
344 int dom, flind, oind, pind, segind;
345
346#ifdef VM_PHYSSEG_SPARSE
347 pages = 0;
348#endif
349 for (segind = 0; segind < vm_phys_nsegs; segind++) {
350 seg = &vm_phys_segs[segind];
351#ifdef VM_PHYSSEG_SPARSE
352 seg->first_page = &vm_page_array[pages];
353 pages += atop(seg->end - seg->start);
354#else
355 seg->first_page = PHYS_TO_VM_PAGE(seg->start);
356#endif
357 }
358 for (dom = 0; dom < vm_ndomains; dom++) {
359 for (flind = 0; flind < vm_nfreelists; flind++) {
360 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
361 fl = vm_phys_free_queues[dom][flind][pind];
362 for (oind = 0; oind < VM_NFREEORDER; oind++)
363 TAILQ_INIT(&fl[oind].pl);
364 }
365 }
366 }
367 mtx_init(&vm_phys_fictitious_reg_mtx, "vmfctr", NULL, MTX_DEF);
368}
369
370/*
371 * Split a contiguous, power of two-sized set of physical pages.
372 */
373static __inline void
374vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl, int order)
375{
376 vm_page_t m_buddy;
377
378 while (oind > order) {
379 oind--;
380 m_buddy = &m[1 << oind];
381 KASSERT(m_buddy->order == VM_NFREEORDER,
382 ("vm_phys_split_pages: page %p has unexpected order %d",
383 m_buddy, m_buddy->order));
384 vm_freelist_add(fl, m_buddy, oind, 0);
385 }
386}
387
388/*
389 * Initialize a physical page and add it to the free lists.
390 */
391void
392vm_phys_add_page(vm_paddr_t pa)
393{
394 vm_page_t m;
395 struct vm_domain *vmd;
396
397 cnt.v_page_count++;
398 m = vm_phys_paddr_to_vm_page(pa);
399 m->phys_addr = pa;
400 m->queue = PQ_NONE;
401 m->segind = vm_phys_paddr_to_segind(pa);
402 vmd = vm_phys_domain(m);
403 vmd->vmd_page_count++;
404 vmd->vmd_segs |= 1UL << m->segind;
405 m->flags = PG_FREE;
406 KASSERT(m->order == VM_NFREEORDER,
407 ("vm_phys_add_page: page %p has unexpected order %d",
408 m, m->order));
409 m->pool = VM_FREEPOOL_DEFAULT;
410 pmap_page_init(m);
411 mtx_lock(&vm_page_queue_free_mtx);
412 vm_phys_freecnt_adj(m, 1);
413 vm_phys_free_pages(m, 0);
414 mtx_unlock(&vm_page_queue_free_mtx);
415}
416
417/*
418 * Allocate a contiguous, power of two-sized set of physical pages
419 * from the free lists.
420 *
421 * The free page queues must be locked.
422 */
423vm_page_t
424vm_phys_alloc_pages(int pool, int order)
425{
426 vm_page_t m;
427 int dom, domain, flind;
428
429 KASSERT(pool < VM_NFREEPOOL,
430 ("vm_phys_alloc_pages: pool %d is out of range", pool));
431 KASSERT(order < VM_NFREEORDER,
432 ("vm_phys_alloc_pages: order %d is out of range", order));
433
434 for (dom = 0; dom < vm_ndomains; dom++) {
435 domain = vm_rr_selectdomain();
436 for (flind = 0; flind < vm_nfreelists; flind++) {
437 m = vm_phys_alloc_domain_pages(domain, flind, pool,
438 order);
439 if (m != NULL)
440 return (m);
441 }
442 }
443 return (NULL);
444}
445
446/*
447 * Find and dequeue a free page on the given free list, with the
448 * specified pool and order
449 */
450vm_page_t
451vm_phys_alloc_freelist_pages(int flind, int pool, int order)
452{
453 vm_page_t m;
454 int dom, domain;
455
456 KASSERT(flind < VM_NFREELIST,
457 ("vm_phys_alloc_freelist_pages: freelist %d is out of range", flind));
458 KASSERT(pool < VM_NFREEPOOL,
459 ("vm_phys_alloc_freelist_pages: pool %d is out of range", pool));
460 KASSERT(order < VM_NFREEORDER,
461 ("vm_phys_alloc_freelist_pages: order %d is out of range", order));
462
463 for (dom = 0; dom < vm_ndomains; dom++) {
464 domain = vm_rr_selectdomain();
465 m = vm_phys_alloc_domain_pages(domain, flind, pool, order);
466 if (m != NULL)
467 return (m);
468 }
469 return (NULL);
470}
471
472static vm_page_t
473vm_phys_alloc_domain_pages(int domain, int flind, int pool, int order)
474{
475 struct vm_freelist *fl;
476 struct vm_freelist *alt;
477 int oind, pind;
478 vm_page_t m;
479
480 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
481 fl = &vm_phys_free_queues[domain][flind][pool][0];
482 for (oind = order; oind < VM_NFREEORDER; oind++) {
483 m = TAILQ_FIRST(&fl[oind].pl);
484 if (m != NULL) {
485 vm_freelist_rem(fl, m, oind);
486 vm_phys_split_pages(m, oind, fl, order);
487 return (m);
488 }
489 }
490
491 /*
492 * The given pool was empty. Find the largest
493 * contiguous, power-of-two-sized set of pages in any
494 * pool. Transfer these pages to the given pool, and
495 * use them to satisfy the allocation.
496 */
497 for (oind = VM_NFREEORDER - 1; oind >= order; oind--) {
498 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
499 alt = &vm_phys_free_queues[domain][flind][pind][0];
500 m = TAILQ_FIRST(&alt[oind].pl);
501 if (m != NULL) {
502 vm_freelist_rem(alt, m, oind);
503 vm_phys_set_pool(pool, m, oind);
504 vm_phys_split_pages(m, oind, fl, order);
505 return (m);
506 }
507 }
508 }
509 return (NULL);
510}
511
512/*
513 * Find the vm_page corresponding to the given physical address.
514 */
515vm_page_t
516vm_phys_paddr_to_vm_page(vm_paddr_t pa)
517{
518 struct vm_phys_seg *seg;
519 int segind;
520
521 for (segind = 0; segind < vm_phys_nsegs; segind++) {
522 seg = &vm_phys_segs[segind];
523 if (pa >= seg->start && pa < seg->end)
524 return (&seg->first_page[atop(pa - seg->start)]);
525 }
526 return (NULL);
527}
528
529vm_page_t
530vm_phys_fictitious_to_vm_page(vm_paddr_t pa)
531{
532 struct vm_phys_fictitious_seg *seg;
533 vm_page_t m;
534 int segind;
535
536 m = NULL;
537 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
538 seg = &vm_phys_fictitious_segs[segind];
539 if (pa >= seg->start && pa < seg->end) {
540 m = &seg->first_page[atop(pa - seg->start)];
541 KASSERT((m->flags & PG_FICTITIOUS) != 0,
542 ("%p not fictitious", m));
543 break;
544 }
545 }
546 return (m);
547}
548
549int
550vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
551 vm_memattr_t memattr)
552{
553 struct vm_phys_fictitious_seg *seg;
554 vm_page_t fp;
555 long i, page_count;
556 int segind;
557#ifdef VM_PHYSSEG_DENSE
558 long pi;
559 boolean_t malloced;
560#endif
561
562 page_count = (end - start) / PAGE_SIZE;
563
564#ifdef VM_PHYSSEG_DENSE
565 pi = atop(start);
566 if (pi >= first_page && pi < vm_page_array_size + first_page) {
567 if (atop(end) >= vm_page_array_size + first_page)
568 return (EINVAL);
569 fp = &vm_page_array[pi - first_page];
570 malloced = FALSE;
571 } else
572#endif
573 {
574 fp = malloc(page_count * sizeof(struct vm_page), M_FICT_PAGES,
575 M_WAITOK | M_ZERO);
576#ifdef VM_PHYSSEG_DENSE
577 malloced = TRUE;
578#endif
579 }
580 for (i = 0; i < page_count; i++) {
581 vm_page_initfake(&fp[i], start + PAGE_SIZE * i, memattr);
582 fp[i].oflags &= ~VPO_UNMANAGED;
583 fp[i].busy_lock = VPB_UNBUSIED;
584 }
585 mtx_lock(&vm_phys_fictitious_reg_mtx);
586 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
587 seg = &vm_phys_fictitious_segs[segind];
588 if (seg->start == 0 && seg->end == 0) {
589 seg->start = start;
590 seg->end = end;
591 seg->first_page = fp;
592 mtx_unlock(&vm_phys_fictitious_reg_mtx);
593 return (0);
594 }
595 }
596 mtx_unlock(&vm_phys_fictitious_reg_mtx);
597#ifdef VM_PHYSSEG_DENSE
598 if (malloced)
599#endif
600 free(fp, M_FICT_PAGES);
601 return (EBUSY);
602}
603
604void
605vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end)
606{
607 struct vm_phys_fictitious_seg *seg;
608 vm_page_t fp;
609 int segind;
610#ifdef VM_PHYSSEG_DENSE
611 long pi;
612#endif
613
614#ifdef VM_PHYSSEG_DENSE
615 pi = atop(start);
616#endif
617
618 mtx_lock(&vm_phys_fictitious_reg_mtx);
619 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
620 seg = &vm_phys_fictitious_segs[segind];
621 if (seg->start == start && seg->end == end) {
622 seg->start = seg->end = 0;
623 fp = seg->first_page;
624 seg->first_page = NULL;
625 mtx_unlock(&vm_phys_fictitious_reg_mtx);
626#ifdef VM_PHYSSEG_DENSE
627 if (pi < first_page || atop(end) >= vm_page_array_size)
628#endif
629 free(fp, M_FICT_PAGES);
630 return;
631 }
632 }
633 mtx_unlock(&vm_phys_fictitious_reg_mtx);
634 KASSERT(0, ("Unregistering not registered fictitious range"));
635}
636
637/*
638 * Find the segment containing the given physical address.
639 */
640static int
641vm_phys_paddr_to_segind(vm_paddr_t pa)
642{
643 struct vm_phys_seg *seg;
644 int segind;
645
646 for (segind = 0; segind < vm_phys_nsegs; segind++) {
647 seg = &vm_phys_segs[segind];
648 if (pa >= seg->start && pa < seg->end)
649 return (segind);
650 }
651 panic("vm_phys_paddr_to_segind: paddr %#jx is not in any segment" ,
652 (uintmax_t)pa);
653}
654
655/*
656 * Free a contiguous, power of two-sized set of physical pages.
657 *
658 * The free page queues must be locked.
659 */
660void
661vm_phys_free_pages(vm_page_t m, int order)
662{
663 struct vm_freelist *fl;
664 struct vm_phys_seg *seg;
665 vm_paddr_t pa;
666 vm_page_t m_buddy;
667
668 KASSERT(m->order == VM_NFREEORDER,
669 ("vm_phys_free_pages: page %p has unexpected order %d",
670 m, m->order));
671 KASSERT(m->pool < VM_NFREEPOOL,
672 ("vm_phys_free_pages: page %p has unexpected pool %d",
673 m, m->pool));
674 KASSERT(order < VM_NFREEORDER,
675 ("vm_phys_free_pages: order %d is out of range", order));
676 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
677 seg = &vm_phys_segs[m->segind];
678 if (order < VM_NFREEORDER - 1) {
679 pa = VM_PAGE_TO_PHYS(m);
680 do {
681 pa ^= ((vm_paddr_t)1 << (PAGE_SHIFT + order));
682 if (pa < seg->start || pa >= seg->end)
683 break;
684 m_buddy = &seg->first_page[atop(pa - seg->start)];
685 if (m_buddy->order != order)
686 break;
687 fl = (*seg->free_queues)[m_buddy->pool];
688 vm_freelist_rem(fl, m_buddy, order);
689 if (m_buddy->pool != m->pool)
690 vm_phys_set_pool(m->pool, m_buddy, order);
691 order++;
692 pa &= ~(((vm_paddr_t)1 << (PAGE_SHIFT + order)) - 1);
693 m = &seg->first_page[atop(pa - seg->start)];
694 } while (order < VM_NFREEORDER - 1);
695 }
696 fl = (*seg->free_queues)[m->pool];
697 vm_freelist_add(fl, m, order, 1);
698}
699
700/*
701 * Free a contiguous, arbitrarily sized set of physical pages.
702 *
703 * The free page queues must be locked.
704 */
705void
706vm_phys_free_contig(vm_page_t m, u_long npages)
707{
708 u_int n;
709 int order;
710
711 /*
712 * Avoid unnecessary coalescing by freeing the pages in the largest
713 * possible power-of-two-sized subsets.
714 */
715 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
716 for (;; npages -= n) {
717 /*
718 * Unsigned "min" is used here so that "order" is assigned
719 * "VM_NFREEORDER - 1" when "m"'s physical address is zero
720 * or the low-order bits of its physical address are zero
721 * because the size of a physical address exceeds the size of
722 * a long.
723 */
724 order = min(ffsl(VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT) - 1,
725 VM_NFREEORDER - 1);
726 n = 1 << order;
727 if (npages < n)
728 break;
729 vm_phys_free_pages(m, order);
730 m += n;
731 }
732 /* The residual "npages" is less than "1 << (VM_NFREEORDER - 1)". */
733 for (; npages > 0; npages -= n) {
734 order = flsl(npages) - 1;
735 n = 1 << order;
736 vm_phys_free_pages(m, order);
737 m += n;
738 }
739}
740
741/*
742 * Set the pool for a contiguous, power of two-sized set of physical pages.
743 */
744void
745vm_phys_set_pool(int pool, vm_page_t m, int order)
746{
747 vm_page_t m_tmp;
748
749 for (m_tmp = m; m_tmp < &m[1 << order]; m_tmp++)
750 m_tmp->pool = pool;
751}
752
753/*
754 * Search for the given physical page "m" in the free lists. If the search
755 * succeeds, remove "m" from the free lists and return TRUE. Otherwise, return
756 * FALSE, indicating that "m" is not in the free lists.
757 *
758 * The free page queues must be locked.
759 */
760boolean_t
761vm_phys_unfree_page(vm_page_t m)
762{
763 struct vm_freelist *fl;
764 struct vm_phys_seg *seg;
765 vm_paddr_t pa, pa_half;
766 vm_page_t m_set, m_tmp;
767 int order;
768
769 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
770
771 /*
772 * First, find the contiguous, power of two-sized set of free
773 * physical pages containing the given physical page "m" and
774 * assign it to "m_set".
775 */
776 seg = &vm_phys_segs[m->segind];
777 for (m_set = m, order = 0; m_set->order == VM_NFREEORDER &&
778 order < VM_NFREEORDER - 1; ) {
779 order++;
780 pa = m->phys_addr & (~(vm_paddr_t)0 << (PAGE_SHIFT + order));
781 if (pa >= seg->start)
782 m_set = &seg->first_page[atop(pa - seg->start)];
783 else
784 return (FALSE);
785 }
786 if (m_set->order < order)
787 return (FALSE);
788 if (m_set->order == VM_NFREEORDER)
789 return (FALSE);
790 KASSERT(m_set->order < VM_NFREEORDER,
791 ("vm_phys_unfree_page: page %p has unexpected order %d",
792 m_set, m_set->order));
793
794 /*
795 * Next, remove "m_set" from the free lists. Finally, extract
796 * "m" from "m_set" using an iterative algorithm: While "m_set"
797 * is larger than a page, shrink "m_set" by returning the half
798 * of "m_set" that does not contain "m" to the free lists.
799 */
800 fl = (*seg->free_queues)[m_set->pool];
801 order = m_set->order;
802 vm_freelist_rem(fl, m_set, order);
803 while (order > 0) {
804 order--;
805 pa_half = m_set->phys_addr ^ (1 << (PAGE_SHIFT + order));
806 if (m->phys_addr < pa_half)
807 m_tmp = &seg->first_page[atop(pa_half - seg->start)];
808 else {
809 m_tmp = m_set;
810 m_set = &seg->first_page[atop(pa_half - seg->start)];
811 }
812 vm_freelist_add(fl, m_tmp, order, 0);
813 }
814 KASSERT(m_set == m, ("vm_phys_unfree_page: fatal inconsistency"));
815 return (TRUE);
816}
817
818/*
819 * Try to zero one physical page. Used by an idle priority thread.
820 */
821boolean_t
822vm_phys_zero_pages_idle(void)
823{
824 static struct vm_freelist *fl;
825 static int flind, oind, pind;
826 vm_page_t m, m_tmp;
827 int domain;
828
829 domain = vm_rr_selectdomain();
830 fl = vm_phys_free_queues[domain][0][0];
831 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
832 for (;;) {
833 TAILQ_FOREACH_REVERSE(m, &fl[oind].pl, pglist, plinks.q) {
834 for (m_tmp = m; m_tmp < &m[1 << oind]; m_tmp++) {
835 if ((m_tmp->flags & (PG_CACHED | PG_ZERO)) == 0) {
836 vm_phys_unfree_page(m_tmp);
837 vm_phys_freecnt_adj(m, -1);
838 mtx_unlock(&vm_page_queue_free_mtx);
839 pmap_zero_page_idle(m_tmp);
840 m_tmp->flags |= PG_ZERO;
841 mtx_lock(&vm_page_queue_free_mtx);
842 vm_phys_freecnt_adj(m, 1);
843 vm_phys_free_pages(m_tmp, 0);
844 vm_page_zero_count++;
845 cnt_prezero++;
846 return (TRUE);
847 }
848 }
849 }
850 oind++;
851 if (oind == VM_NFREEORDER) {
852 oind = 0;
853 pind++;
854 if (pind == VM_NFREEPOOL) {
855 pind = 0;
856 flind++;
857 if (flind == vm_nfreelists)
858 flind = 0;
859 }
860 fl = vm_phys_free_queues[domain][flind][pind];
861 }
862 }
863}
864
865/*
866 * Allocate a contiguous set of physical pages of the given size
867 * "npages" from the free lists. All of the physical pages must be at
868 * or above the given physical address "low" and below the given
869 * physical address "high". The given value "alignment" determines the
870 * alignment of the first physical page in the set. If the given value
871 * "boundary" is non-zero, then the set of physical pages cannot cross
872 * any physical address boundary that is a multiple of that value. Both
873 * "alignment" and "boundary" must be a power of two.
874 */
875vm_page_t
876vm_phys_alloc_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
877 u_long alignment, vm_paddr_t boundary)
878{
879 struct vm_freelist *fl;
880 struct vm_phys_seg *seg;
881 vm_paddr_t pa, pa_last, size;
882 vm_page_t m, m_ret;
883 u_long npages_end;
884 int dom, domain, flind, oind, order, pind;
885
886 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
887 size = npages << PAGE_SHIFT;
888 KASSERT(size != 0,
889 ("vm_phys_alloc_contig: size must not be 0"));
890 KASSERT((alignment & (alignment - 1)) == 0,
891 ("vm_phys_alloc_contig: alignment must be a power of 2"));
892 KASSERT((boundary & (boundary - 1)) == 0,
893 ("vm_phys_alloc_contig: boundary must be a power of 2"));
894 /* Compute the queue that is the best fit for npages. */
895 for (order = 0; (1 << order) < npages; order++);
896 dom = 0;
897restartdom:
898 domain = vm_rr_selectdomain();
899 for (flind = 0; flind < vm_nfreelists; flind++) {
900 for (oind = min(order, VM_NFREEORDER - 1); oind < VM_NFREEORDER; oind++) {
901 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
902 fl = &vm_phys_free_queues[domain][flind][pind][0];
903 TAILQ_FOREACH(m_ret, &fl[oind].pl, plinks.q) {
904 /*
905 * A free list may contain physical pages
906 * from one or more segments.
907 */
908 seg = &vm_phys_segs[m_ret->segind];
909 if (seg->start > high ||
910 low >= seg->end)
911 continue;
912
913 /*
914 * Is the size of this allocation request
915 * larger than the largest block size?
916 */
917 if (order >= VM_NFREEORDER) {
918 /*
919 * Determine if a sufficient number
920 * of subsequent blocks to satisfy
921 * the allocation request are free.
922 */
923 pa = VM_PAGE_TO_PHYS(m_ret);
924 pa_last = pa + size;
925 for (;;) {
926 pa += 1 << (PAGE_SHIFT + VM_NFREEORDER - 1);
927 if (pa >= pa_last)
928 break;
929 if (pa < seg->start ||
930 pa >= seg->end)
931 break;
932 m = &seg->first_page[atop(pa - seg->start)];
933 if (m->order != VM_NFREEORDER - 1)
934 break;
935 }
936 /* If not, continue to the next block. */
937 if (pa < pa_last)
938 continue;
939 }
940
941 /*
942 * Determine if the blocks are within the given range,
943 * satisfy the given alignment, and do not cross the
944 * given boundary.
945 */
946 pa = VM_PAGE_TO_PHYS(m_ret);
947 if (pa >= low &&
948 pa + size <= high &&
949 (pa & (alignment - 1)) == 0 &&
950 ((pa ^ (pa + size - 1)) & ~(boundary - 1)) == 0)
951 goto done;
952 }
953 }
954 }
955 }
956 if (++dom < vm_ndomains)
957 goto restartdom;
958 return (NULL);
959done:
960 for (m = m_ret; m < &m_ret[npages]; m = &m[1 << oind]) {
961 fl = (*seg->free_queues)[m->pool];
962 vm_freelist_rem(fl, m, m->order);
963 }
964 if (m_ret->pool != VM_FREEPOOL_DEFAULT)
965 vm_phys_set_pool(VM_FREEPOOL_DEFAULT, m_ret, oind);
966 fl = (*seg->free_queues)[m_ret->pool];
967 vm_phys_split_pages(m_ret, oind, fl, order);
968 /* Return excess pages to the free lists. */
969 npages_end = roundup2(npages, 1 << imin(oind, order));
970 if (npages < npages_end)
971 vm_phys_free_contig(&m_ret[npages], npages_end - npages);
972 return (m_ret);
973}
974
975#ifdef DDB
976/*
977 * Show the number of physical pages in each of the free lists.
978 */
979DB_SHOW_COMMAND(freepages, db_show_freepages)
980{
981 struct vm_freelist *fl;
982 int flind, oind, pind, dom;
983
984 for (dom = 0; dom < vm_ndomains; dom++) {
985 db_printf("DOMAIN: %d\n", dom);
986 for (flind = 0; flind < vm_nfreelists; flind++) {
987 db_printf("FREE LIST %d:\n"
988 "\n ORDER (SIZE) | NUMBER"
989 "\n ", flind);
990 for (pind = 0; pind < VM_NFREEPOOL; pind++)
991 db_printf(" | POOL %d", pind);
992 db_printf("\n-- ");
993 for (pind = 0; pind < VM_NFREEPOOL; pind++)
994 db_printf("-- -- ");
995 db_printf("--\n");
996 for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
997 db_printf(" %2.2d (%6.6dK)", oind,
998 1 << (PAGE_SHIFT - 10 + oind));
999 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
1000 fl = vm_phys_free_queues[dom][flind][pind];
1001 db_printf(" | %6.6d", fl[oind].lcnt);
1002 }
1003 db_printf("\n");
1004 }
1005 db_printf("\n");
1006 }
1007 db_printf("\n");
1008 }
1009}
1010#endif
2 * Copyright (c) 2002-2006 Rice University
3 * Copyright (c) 2007 Alan L. Cox <alc@cs.rice.edu>
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Alan L. Cox,
7 * Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
28 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Physical memory system implementation
34 *
35 * Any external functions defined by this module are only to be used by the
36 * virtual memory system.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: stable/10/sys/vm/vm_phys.c 276546 2015-01-02 17:45:52Z alc $");
41
42#include "opt_ddb.h"
43#include "opt_vm.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/lock.h>
48#include <sys/kernel.h>
49#include <sys/malloc.h>
50#include <sys/mutex.h>
51#if MAXMEMDOM > 1
52#include <sys/proc.h>
53#endif
54#include <sys/queue.h>
55#include <sys/sbuf.h>
56#include <sys/sysctl.h>
57#include <sys/vmmeter.h>
58
59#include <ddb/ddb.h>
60
61#include <vm/vm.h>
62#include <vm/vm_param.h>
63#include <vm/vm_kern.h>
64#include <vm/vm_object.h>
65#include <vm/vm_page.h>
66#include <vm/vm_phys.h>
67
68_Static_assert(sizeof(long) * NBBY >= VM_PHYSSEG_MAX,
69 "Too many physsegs.");
70
71struct mem_affinity *mem_affinity;
72
73int vm_ndomains = 1;
74
75struct vm_phys_seg vm_phys_segs[VM_PHYSSEG_MAX];
76int vm_phys_nsegs;
77
78#define VM_PHYS_FICTITIOUS_NSEGS 8
79static struct vm_phys_fictitious_seg {
80 vm_paddr_t start;
81 vm_paddr_t end;
82 vm_page_t first_page;
83} vm_phys_fictitious_segs[VM_PHYS_FICTITIOUS_NSEGS];
84static struct mtx vm_phys_fictitious_reg_mtx;
85MALLOC_DEFINE(M_FICT_PAGES, "vm_fictitious", "Fictitious VM pages");
86
87static struct vm_freelist
88 vm_phys_free_queues[MAXMEMDOM][VM_NFREELIST][VM_NFREEPOOL][VM_NFREEORDER];
89
90static int vm_nfreelists = VM_FREELIST_DEFAULT + 1;
91
92static int cnt_prezero;
93SYSCTL_INT(_vm_stats_misc, OID_AUTO, cnt_prezero, CTLFLAG_RD,
94 &cnt_prezero, 0, "The number of physical pages prezeroed at idle time");
95
96static int sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS);
97SYSCTL_OID(_vm, OID_AUTO, phys_free, CTLTYPE_STRING | CTLFLAG_RD,
98 NULL, 0, sysctl_vm_phys_free, "A", "Phys Free Info");
99
100static int sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS);
101SYSCTL_OID(_vm, OID_AUTO, phys_segs, CTLTYPE_STRING | CTLFLAG_RD,
102 NULL, 0, sysctl_vm_phys_segs, "A", "Phys Seg Info");
103
104SYSCTL_INT(_vm, OID_AUTO, ndomains, CTLFLAG_RD,
105 &vm_ndomains, 0, "Number of physical memory domains available.");
106
107static vm_page_t vm_phys_alloc_domain_pages(int domain, int flind, int pool,
108 int order);
109static void _vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind,
110 int domain);
111static void vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind);
112static int vm_phys_paddr_to_segind(vm_paddr_t pa);
113static void vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl,
114 int order);
115
116static __inline int
117vm_rr_selectdomain(void)
118{
119#if MAXMEMDOM > 1
120 struct thread *td;
121
122 td = curthread;
123
124 td->td_dom_rr_idx++;
125 td->td_dom_rr_idx %= vm_ndomains;
126 return (td->td_dom_rr_idx);
127#else
128 return (0);
129#endif
130}
131
132boolean_t
133vm_phys_domain_intersects(long mask, vm_paddr_t low, vm_paddr_t high)
134{
135 struct vm_phys_seg *s;
136 int idx;
137
138 while ((idx = ffsl(mask)) != 0) {
139 idx--; /* ffsl counts from 1 */
140 mask &= ~(1UL << idx);
141 s = &vm_phys_segs[idx];
142 if (low < s->end && high > s->start)
143 return (TRUE);
144 }
145 return (FALSE);
146}
147
148/*
149 * Outputs the state of the physical memory allocator, specifically,
150 * the amount of physical memory in each free list.
151 */
152static int
153sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS)
154{
155 struct sbuf sbuf;
156 struct vm_freelist *fl;
157 int dom, error, flind, oind, pind;
158
159 error = sysctl_wire_old_buffer(req, 0);
160 if (error != 0)
161 return (error);
162 sbuf_new_for_sysctl(&sbuf, NULL, 128 * vm_ndomains, req);
163 for (dom = 0; dom < vm_ndomains; dom++) {
164 sbuf_printf(&sbuf,"\nDOMAIN %d:\n", dom);
165 for (flind = 0; flind < vm_nfreelists; flind++) {
166 sbuf_printf(&sbuf, "\nFREE LIST %d:\n"
167 "\n ORDER (SIZE) | NUMBER"
168 "\n ", flind);
169 for (pind = 0; pind < VM_NFREEPOOL; pind++)
170 sbuf_printf(&sbuf, " | POOL %d", pind);
171 sbuf_printf(&sbuf, "\n-- ");
172 for (pind = 0; pind < VM_NFREEPOOL; pind++)
173 sbuf_printf(&sbuf, "-- -- ");
174 sbuf_printf(&sbuf, "--\n");
175 for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
176 sbuf_printf(&sbuf, " %2d (%6dK)", oind,
177 1 << (PAGE_SHIFT - 10 + oind));
178 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
179 fl = vm_phys_free_queues[dom][flind][pind];
180 sbuf_printf(&sbuf, " | %6d",
181 fl[oind].lcnt);
182 }
183 sbuf_printf(&sbuf, "\n");
184 }
185 }
186 }
187 error = sbuf_finish(&sbuf);
188 sbuf_delete(&sbuf);
189 return (error);
190}
191
192/*
193 * Outputs the set of physical memory segments.
194 */
195static int
196sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS)
197{
198 struct sbuf sbuf;
199 struct vm_phys_seg *seg;
200 int error, segind;
201
202 error = sysctl_wire_old_buffer(req, 0);
203 if (error != 0)
204 return (error);
205 sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
206 for (segind = 0; segind < vm_phys_nsegs; segind++) {
207 sbuf_printf(&sbuf, "\nSEGMENT %d:\n\n", segind);
208 seg = &vm_phys_segs[segind];
209 sbuf_printf(&sbuf, "start: %#jx\n",
210 (uintmax_t)seg->start);
211 sbuf_printf(&sbuf, "end: %#jx\n",
212 (uintmax_t)seg->end);
213 sbuf_printf(&sbuf, "domain: %d\n", seg->domain);
214 sbuf_printf(&sbuf, "free list: %p\n", seg->free_queues);
215 }
216 error = sbuf_finish(&sbuf);
217 sbuf_delete(&sbuf);
218 return (error);
219}
220
221static void
222vm_freelist_add(struct vm_freelist *fl, vm_page_t m, int order, int tail)
223{
224
225 m->order = order;
226 if (tail)
227 TAILQ_INSERT_TAIL(&fl[order].pl, m, plinks.q);
228 else
229 TAILQ_INSERT_HEAD(&fl[order].pl, m, plinks.q);
230 fl[order].lcnt++;
231}
232
233static void
234vm_freelist_rem(struct vm_freelist *fl, vm_page_t m, int order)
235{
236
237 TAILQ_REMOVE(&fl[order].pl, m, plinks.q);
238 fl[order].lcnt--;
239 m->order = VM_NFREEORDER;
240}
241
242/*
243 * Create a physical memory segment.
244 */
245static void
246_vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind, int domain)
247{
248 struct vm_phys_seg *seg;
249
250 KASSERT(vm_phys_nsegs < VM_PHYSSEG_MAX,
251 ("vm_phys_create_seg: increase VM_PHYSSEG_MAX"));
252 KASSERT(domain < vm_ndomains,
253 ("vm_phys_create_seg: invalid domain provided"));
254 seg = &vm_phys_segs[vm_phys_nsegs++];
255 while (seg > vm_phys_segs && (seg - 1)->start >= end) {
256 *seg = *(seg - 1);
257 seg--;
258 }
259 seg->start = start;
260 seg->end = end;
261 seg->domain = domain;
262 seg->free_queues = &vm_phys_free_queues[domain][flind];
263}
264
265static void
266vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind)
267{
268 int i;
269
270 if (mem_affinity == NULL) {
271 _vm_phys_create_seg(start, end, flind, 0);
272 return;
273 }
274
275 for (i = 0;; i++) {
276 if (mem_affinity[i].end == 0)
277 panic("Reached end of affinity info");
278 if (mem_affinity[i].end <= start)
279 continue;
280 if (mem_affinity[i].start > start)
281 panic("No affinity info for start %jx",
282 (uintmax_t)start);
283 if (mem_affinity[i].end >= end) {
284 _vm_phys_create_seg(start, end, flind,
285 mem_affinity[i].domain);
286 break;
287 }
288 _vm_phys_create_seg(start, mem_affinity[i].end, flind,
289 mem_affinity[i].domain);
290 start = mem_affinity[i].end;
291 }
292}
293
294/*
295 * Add a physical memory segment.
296 */
297void
298vm_phys_add_seg(vm_paddr_t start, vm_paddr_t end)
299{
300
301 KASSERT((start & PAGE_MASK) == 0,
302 ("vm_phys_define_seg: start is not page aligned"));
303 KASSERT((end & PAGE_MASK) == 0,
304 ("vm_phys_define_seg: end is not page aligned"));
305#ifdef VM_FREELIST_ISADMA
306 if (start < 16777216) {
307 if (end > 16777216) {
308 vm_phys_create_seg(start, 16777216,
309 VM_FREELIST_ISADMA);
310 vm_phys_create_seg(16777216, end, VM_FREELIST_DEFAULT);
311 } else
312 vm_phys_create_seg(start, end, VM_FREELIST_ISADMA);
313 if (VM_FREELIST_ISADMA >= vm_nfreelists)
314 vm_nfreelists = VM_FREELIST_ISADMA + 1;
315 } else
316#endif
317#ifdef VM_FREELIST_HIGHMEM
318 if (end > VM_HIGHMEM_ADDRESS) {
319 if (start < VM_HIGHMEM_ADDRESS) {
320 vm_phys_create_seg(start, VM_HIGHMEM_ADDRESS,
321 VM_FREELIST_DEFAULT);
322 vm_phys_create_seg(VM_HIGHMEM_ADDRESS, end,
323 VM_FREELIST_HIGHMEM);
324 } else
325 vm_phys_create_seg(start, end, VM_FREELIST_HIGHMEM);
326 if (VM_FREELIST_HIGHMEM >= vm_nfreelists)
327 vm_nfreelists = VM_FREELIST_HIGHMEM + 1;
328 } else
329#endif
330 vm_phys_create_seg(start, end, VM_FREELIST_DEFAULT);
331}
332
333/*
334 * Initialize the physical memory allocator.
335 */
336void
337vm_phys_init(void)
338{
339 struct vm_freelist *fl;
340 struct vm_phys_seg *seg;
341#ifdef VM_PHYSSEG_SPARSE
342 long pages;
343#endif
344 int dom, flind, oind, pind, segind;
345
346#ifdef VM_PHYSSEG_SPARSE
347 pages = 0;
348#endif
349 for (segind = 0; segind < vm_phys_nsegs; segind++) {
350 seg = &vm_phys_segs[segind];
351#ifdef VM_PHYSSEG_SPARSE
352 seg->first_page = &vm_page_array[pages];
353 pages += atop(seg->end - seg->start);
354#else
355 seg->first_page = PHYS_TO_VM_PAGE(seg->start);
356#endif
357 }
358 for (dom = 0; dom < vm_ndomains; dom++) {
359 for (flind = 0; flind < vm_nfreelists; flind++) {
360 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
361 fl = vm_phys_free_queues[dom][flind][pind];
362 for (oind = 0; oind < VM_NFREEORDER; oind++)
363 TAILQ_INIT(&fl[oind].pl);
364 }
365 }
366 }
367 mtx_init(&vm_phys_fictitious_reg_mtx, "vmfctr", NULL, MTX_DEF);
368}
369
370/*
371 * Split a contiguous, power of two-sized set of physical pages.
372 */
373static __inline void
374vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl, int order)
375{
376 vm_page_t m_buddy;
377
378 while (oind > order) {
379 oind--;
380 m_buddy = &m[1 << oind];
381 KASSERT(m_buddy->order == VM_NFREEORDER,
382 ("vm_phys_split_pages: page %p has unexpected order %d",
383 m_buddy, m_buddy->order));
384 vm_freelist_add(fl, m_buddy, oind, 0);
385 }
386}
387
388/*
389 * Initialize a physical page and add it to the free lists.
390 */
391void
392vm_phys_add_page(vm_paddr_t pa)
393{
394 vm_page_t m;
395 struct vm_domain *vmd;
396
397 cnt.v_page_count++;
398 m = vm_phys_paddr_to_vm_page(pa);
399 m->phys_addr = pa;
400 m->queue = PQ_NONE;
401 m->segind = vm_phys_paddr_to_segind(pa);
402 vmd = vm_phys_domain(m);
403 vmd->vmd_page_count++;
404 vmd->vmd_segs |= 1UL << m->segind;
405 m->flags = PG_FREE;
406 KASSERT(m->order == VM_NFREEORDER,
407 ("vm_phys_add_page: page %p has unexpected order %d",
408 m, m->order));
409 m->pool = VM_FREEPOOL_DEFAULT;
410 pmap_page_init(m);
411 mtx_lock(&vm_page_queue_free_mtx);
412 vm_phys_freecnt_adj(m, 1);
413 vm_phys_free_pages(m, 0);
414 mtx_unlock(&vm_page_queue_free_mtx);
415}
416
417/*
418 * Allocate a contiguous, power of two-sized set of physical pages
419 * from the free lists.
420 *
421 * The free page queues must be locked.
422 */
423vm_page_t
424vm_phys_alloc_pages(int pool, int order)
425{
426 vm_page_t m;
427 int dom, domain, flind;
428
429 KASSERT(pool < VM_NFREEPOOL,
430 ("vm_phys_alloc_pages: pool %d is out of range", pool));
431 KASSERT(order < VM_NFREEORDER,
432 ("vm_phys_alloc_pages: order %d is out of range", order));
433
434 for (dom = 0; dom < vm_ndomains; dom++) {
435 domain = vm_rr_selectdomain();
436 for (flind = 0; flind < vm_nfreelists; flind++) {
437 m = vm_phys_alloc_domain_pages(domain, flind, pool,
438 order);
439 if (m != NULL)
440 return (m);
441 }
442 }
443 return (NULL);
444}
445
446/*
447 * Find and dequeue a free page on the given free list, with the
448 * specified pool and order
449 */
450vm_page_t
451vm_phys_alloc_freelist_pages(int flind, int pool, int order)
452{
453 vm_page_t m;
454 int dom, domain;
455
456 KASSERT(flind < VM_NFREELIST,
457 ("vm_phys_alloc_freelist_pages: freelist %d is out of range", flind));
458 KASSERT(pool < VM_NFREEPOOL,
459 ("vm_phys_alloc_freelist_pages: pool %d is out of range", pool));
460 KASSERT(order < VM_NFREEORDER,
461 ("vm_phys_alloc_freelist_pages: order %d is out of range", order));
462
463 for (dom = 0; dom < vm_ndomains; dom++) {
464 domain = vm_rr_selectdomain();
465 m = vm_phys_alloc_domain_pages(domain, flind, pool, order);
466 if (m != NULL)
467 return (m);
468 }
469 return (NULL);
470}
471
472static vm_page_t
473vm_phys_alloc_domain_pages(int domain, int flind, int pool, int order)
474{
475 struct vm_freelist *fl;
476 struct vm_freelist *alt;
477 int oind, pind;
478 vm_page_t m;
479
480 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
481 fl = &vm_phys_free_queues[domain][flind][pool][0];
482 for (oind = order; oind < VM_NFREEORDER; oind++) {
483 m = TAILQ_FIRST(&fl[oind].pl);
484 if (m != NULL) {
485 vm_freelist_rem(fl, m, oind);
486 vm_phys_split_pages(m, oind, fl, order);
487 return (m);
488 }
489 }
490
491 /*
492 * The given pool was empty. Find the largest
493 * contiguous, power-of-two-sized set of pages in any
494 * pool. Transfer these pages to the given pool, and
495 * use them to satisfy the allocation.
496 */
497 for (oind = VM_NFREEORDER - 1; oind >= order; oind--) {
498 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
499 alt = &vm_phys_free_queues[domain][flind][pind][0];
500 m = TAILQ_FIRST(&alt[oind].pl);
501 if (m != NULL) {
502 vm_freelist_rem(alt, m, oind);
503 vm_phys_set_pool(pool, m, oind);
504 vm_phys_split_pages(m, oind, fl, order);
505 return (m);
506 }
507 }
508 }
509 return (NULL);
510}
511
512/*
513 * Find the vm_page corresponding to the given physical address.
514 */
515vm_page_t
516vm_phys_paddr_to_vm_page(vm_paddr_t pa)
517{
518 struct vm_phys_seg *seg;
519 int segind;
520
521 for (segind = 0; segind < vm_phys_nsegs; segind++) {
522 seg = &vm_phys_segs[segind];
523 if (pa >= seg->start && pa < seg->end)
524 return (&seg->first_page[atop(pa - seg->start)]);
525 }
526 return (NULL);
527}
528
529vm_page_t
530vm_phys_fictitious_to_vm_page(vm_paddr_t pa)
531{
532 struct vm_phys_fictitious_seg *seg;
533 vm_page_t m;
534 int segind;
535
536 m = NULL;
537 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
538 seg = &vm_phys_fictitious_segs[segind];
539 if (pa >= seg->start && pa < seg->end) {
540 m = &seg->first_page[atop(pa - seg->start)];
541 KASSERT((m->flags & PG_FICTITIOUS) != 0,
542 ("%p not fictitious", m));
543 break;
544 }
545 }
546 return (m);
547}
548
549int
550vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
551 vm_memattr_t memattr)
552{
553 struct vm_phys_fictitious_seg *seg;
554 vm_page_t fp;
555 long i, page_count;
556 int segind;
557#ifdef VM_PHYSSEG_DENSE
558 long pi;
559 boolean_t malloced;
560#endif
561
562 page_count = (end - start) / PAGE_SIZE;
563
564#ifdef VM_PHYSSEG_DENSE
565 pi = atop(start);
566 if (pi >= first_page && pi < vm_page_array_size + first_page) {
567 if (atop(end) >= vm_page_array_size + first_page)
568 return (EINVAL);
569 fp = &vm_page_array[pi - first_page];
570 malloced = FALSE;
571 } else
572#endif
573 {
574 fp = malloc(page_count * sizeof(struct vm_page), M_FICT_PAGES,
575 M_WAITOK | M_ZERO);
576#ifdef VM_PHYSSEG_DENSE
577 malloced = TRUE;
578#endif
579 }
580 for (i = 0; i < page_count; i++) {
581 vm_page_initfake(&fp[i], start + PAGE_SIZE * i, memattr);
582 fp[i].oflags &= ~VPO_UNMANAGED;
583 fp[i].busy_lock = VPB_UNBUSIED;
584 }
585 mtx_lock(&vm_phys_fictitious_reg_mtx);
586 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
587 seg = &vm_phys_fictitious_segs[segind];
588 if (seg->start == 0 && seg->end == 0) {
589 seg->start = start;
590 seg->end = end;
591 seg->first_page = fp;
592 mtx_unlock(&vm_phys_fictitious_reg_mtx);
593 return (0);
594 }
595 }
596 mtx_unlock(&vm_phys_fictitious_reg_mtx);
597#ifdef VM_PHYSSEG_DENSE
598 if (malloced)
599#endif
600 free(fp, M_FICT_PAGES);
601 return (EBUSY);
602}
603
604void
605vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end)
606{
607 struct vm_phys_fictitious_seg *seg;
608 vm_page_t fp;
609 int segind;
610#ifdef VM_PHYSSEG_DENSE
611 long pi;
612#endif
613
614#ifdef VM_PHYSSEG_DENSE
615 pi = atop(start);
616#endif
617
618 mtx_lock(&vm_phys_fictitious_reg_mtx);
619 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
620 seg = &vm_phys_fictitious_segs[segind];
621 if (seg->start == start && seg->end == end) {
622 seg->start = seg->end = 0;
623 fp = seg->first_page;
624 seg->first_page = NULL;
625 mtx_unlock(&vm_phys_fictitious_reg_mtx);
626#ifdef VM_PHYSSEG_DENSE
627 if (pi < first_page || atop(end) >= vm_page_array_size)
628#endif
629 free(fp, M_FICT_PAGES);
630 return;
631 }
632 }
633 mtx_unlock(&vm_phys_fictitious_reg_mtx);
634 KASSERT(0, ("Unregistering not registered fictitious range"));
635}
636
637/*
638 * Find the segment containing the given physical address.
639 */
640static int
641vm_phys_paddr_to_segind(vm_paddr_t pa)
642{
643 struct vm_phys_seg *seg;
644 int segind;
645
646 for (segind = 0; segind < vm_phys_nsegs; segind++) {
647 seg = &vm_phys_segs[segind];
648 if (pa >= seg->start && pa < seg->end)
649 return (segind);
650 }
651 panic("vm_phys_paddr_to_segind: paddr %#jx is not in any segment" ,
652 (uintmax_t)pa);
653}
654
655/*
656 * Free a contiguous, power of two-sized set of physical pages.
657 *
658 * The free page queues must be locked.
659 */
660void
661vm_phys_free_pages(vm_page_t m, int order)
662{
663 struct vm_freelist *fl;
664 struct vm_phys_seg *seg;
665 vm_paddr_t pa;
666 vm_page_t m_buddy;
667
668 KASSERT(m->order == VM_NFREEORDER,
669 ("vm_phys_free_pages: page %p has unexpected order %d",
670 m, m->order));
671 KASSERT(m->pool < VM_NFREEPOOL,
672 ("vm_phys_free_pages: page %p has unexpected pool %d",
673 m, m->pool));
674 KASSERT(order < VM_NFREEORDER,
675 ("vm_phys_free_pages: order %d is out of range", order));
676 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
677 seg = &vm_phys_segs[m->segind];
678 if (order < VM_NFREEORDER - 1) {
679 pa = VM_PAGE_TO_PHYS(m);
680 do {
681 pa ^= ((vm_paddr_t)1 << (PAGE_SHIFT + order));
682 if (pa < seg->start || pa >= seg->end)
683 break;
684 m_buddy = &seg->first_page[atop(pa - seg->start)];
685 if (m_buddy->order != order)
686 break;
687 fl = (*seg->free_queues)[m_buddy->pool];
688 vm_freelist_rem(fl, m_buddy, order);
689 if (m_buddy->pool != m->pool)
690 vm_phys_set_pool(m->pool, m_buddy, order);
691 order++;
692 pa &= ~(((vm_paddr_t)1 << (PAGE_SHIFT + order)) - 1);
693 m = &seg->first_page[atop(pa - seg->start)];
694 } while (order < VM_NFREEORDER - 1);
695 }
696 fl = (*seg->free_queues)[m->pool];
697 vm_freelist_add(fl, m, order, 1);
698}
699
700/*
701 * Free a contiguous, arbitrarily sized set of physical pages.
702 *
703 * The free page queues must be locked.
704 */
705void
706vm_phys_free_contig(vm_page_t m, u_long npages)
707{
708 u_int n;
709 int order;
710
711 /*
712 * Avoid unnecessary coalescing by freeing the pages in the largest
713 * possible power-of-two-sized subsets.
714 */
715 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
716 for (;; npages -= n) {
717 /*
718 * Unsigned "min" is used here so that "order" is assigned
719 * "VM_NFREEORDER - 1" when "m"'s physical address is zero
720 * or the low-order bits of its physical address are zero
721 * because the size of a physical address exceeds the size of
722 * a long.
723 */
724 order = min(ffsl(VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT) - 1,
725 VM_NFREEORDER - 1);
726 n = 1 << order;
727 if (npages < n)
728 break;
729 vm_phys_free_pages(m, order);
730 m += n;
731 }
732 /* The residual "npages" is less than "1 << (VM_NFREEORDER - 1)". */
733 for (; npages > 0; npages -= n) {
734 order = flsl(npages) - 1;
735 n = 1 << order;
736 vm_phys_free_pages(m, order);
737 m += n;
738 }
739}
740
741/*
742 * Set the pool for a contiguous, power of two-sized set of physical pages.
743 */
744void
745vm_phys_set_pool(int pool, vm_page_t m, int order)
746{
747 vm_page_t m_tmp;
748
749 for (m_tmp = m; m_tmp < &m[1 << order]; m_tmp++)
750 m_tmp->pool = pool;
751}
752
753/*
754 * Search for the given physical page "m" in the free lists. If the search
755 * succeeds, remove "m" from the free lists and return TRUE. Otherwise, return
756 * FALSE, indicating that "m" is not in the free lists.
757 *
758 * The free page queues must be locked.
759 */
760boolean_t
761vm_phys_unfree_page(vm_page_t m)
762{
763 struct vm_freelist *fl;
764 struct vm_phys_seg *seg;
765 vm_paddr_t pa, pa_half;
766 vm_page_t m_set, m_tmp;
767 int order;
768
769 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
770
771 /*
772 * First, find the contiguous, power of two-sized set of free
773 * physical pages containing the given physical page "m" and
774 * assign it to "m_set".
775 */
776 seg = &vm_phys_segs[m->segind];
777 for (m_set = m, order = 0; m_set->order == VM_NFREEORDER &&
778 order < VM_NFREEORDER - 1; ) {
779 order++;
780 pa = m->phys_addr & (~(vm_paddr_t)0 << (PAGE_SHIFT + order));
781 if (pa >= seg->start)
782 m_set = &seg->first_page[atop(pa - seg->start)];
783 else
784 return (FALSE);
785 }
786 if (m_set->order < order)
787 return (FALSE);
788 if (m_set->order == VM_NFREEORDER)
789 return (FALSE);
790 KASSERT(m_set->order < VM_NFREEORDER,
791 ("vm_phys_unfree_page: page %p has unexpected order %d",
792 m_set, m_set->order));
793
794 /*
795 * Next, remove "m_set" from the free lists. Finally, extract
796 * "m" from "m_set" using an iterative algorithm: While "m_set"
797 * is larger than a page, shrink "m_set" by returning the half
798 * of "m_set" that does not contain "m" to the free lists.
799 */
800 fl = (*seg->free_queues)[m_set->pool];
801 order = m_set->order;
802 vm_freelist_rem(fl, m_set, order);
803 while (order > 0) {
804 order--;
805 pa_half = m_set->phys_addr ^ (1 << (PAGE_SHIFT + order));
806 if (m->phys_addr < pa_half)
807 m_tmp = &seg->first_page[atop(pa_half - seg->start)];
808 else {
809 m_tmp = m_set;
810 m_set = &seg->first_page[atop(pa_half - seg->start)];
811 }
812 vm_freelist_add(fl, m_tmp, order, 0);
813 }
814 KASSERT(m_set == m, ("vm_phys_unfree_page: fatal inconsistency"));
815 return (TRUE);
816}
817
818/*
819 * Try to zero one physical page. Used by an idle priority thread.
820 */
821boolean_t
822vm_phys_zero_pages_idle(void)
823{
824 static struct vm_freelist *fl;
825 static int flind, oind, pind;
826 vm_page_t m, m_tmp;
827 int domain;
828
829 domain = vm_rr_selectdomain();
830 fl = vm_phys_free_queues[domain][0][0];
831 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
832 for (;;) {
833 TAILQ_FOREACH_REVERSE(m, &fl[oind].pl, pglist, plinks.q) {
834 for (m_tmp = m; m_tmp < &m[1 << oind]; m_tmp++) {
835 if ((m_tmp->flags & (PG_CACHED | PG_ZERO)) == 0) {
836 vm_phys_unfree_page(m_tmp);
837 vm_phys_freecnt_adj(m, -1);
838 mtx_unlock(&vm_page_queue_free_mtx);
839 pmap_zero_page_idle(m_tmp);
840 m_tmp->flags |= PG_ZERO;
841 mtx_lock(&vm_page_queue_free_mtx);
842 vm_phys_freecnt_adj(m, 1);
843 vm_phys_free_pages(m_tmp, 0);
844 vm_page_zero_count++;
845 cnt_prezero++;
846 return (TRUE);
847 }
848 }
849 }
850 oind++;
851 if (oind == VM_NFREEORDER) {
852 oind = 0;
853 pind++;
854 if (pind == VM_NFREEPOOL) {
855 pind = 0;
856 flind++;
857 if (flind == vm_nfreelists)
858 flind = 0;
859 }
860 fl = vm_phys_free_queues[domain][flind][pind];
861 }
862 }
863}
864
865/*
866 * Allocate a contiguous set of physical pages of the given size
867 * "npages" from the free lists. All of the physical pages must be at
868 * or above the given physical address "low" and below the given
869 * physical address "high". The given value "alignment" determines the
870 * alignment of the first physical page in the set. If the given value
871 * "boundary" is non-zero, then the set of physical pages cannot cross
872 * any physical address boundary that is a multiple of that value. Both
873 * "alignment" and "boundary" must be a power of two.
874 */
875vm_page_t
876vm_phys_alloc_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
877 u_long alignment, vm_paddr_t boundary)
878{
879 struct vm_freelist *fl;
880 struct vm_phys_seg *seg;
881 vm_paddr_t pa, pa_last, size;
882 vm_page_t m, m_ret;
883 u_long npages_end;
884 int dom, domain, flind, oind, order, pind;
885
886 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
887 size = npages << PAGE_SHIFT;
888 KASSERT(size != 0,
889 ("vm_phys_alloc_contig: size must not be 0"));
890 KASSERT((alignment & (alignment - 1)) == 0,
891 ("vm_phys_alloc_contig: alignment must be a power of 2"));
892 KASSERT((boundary & (boundary - 1)) == 0,
893 ("vm_phys_alloc_contig: boundary must be a power of 2"));
894 /* Compute the queue that is the best fit for npages. */
895 for (order = 0; (1 << order) < npages; order++);
896 dom = 0;
897restartdom:
898 domain = vm_rr_selectdomain();
899 for (flind = 0; flind < vm_nfreelists; flind++) {
900 for (oind = min(order, VM_NFREEORDER - 1); oind < VM_NFREEORDER; oind++) {
901 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
902 fl = &vm_phys_free_queues[domain][flind][pind][0];
903 TAILQ_FOREACH(m_ret, &fl[oind].pl, plinks.q) {
904 /*
905 * A free list may contain physical pages
906 * from one or more segments.
907 */
908 seg = &vm_phys_segs[m_ret->segind];
909 if (seg->start > high ||
910 low >= seg->end)
911 continue;
912
913 /*
914 * Is the size of this allocation request
915 * larger than the largest block size?
916 */
917 if (order >= VM_NFREEORDER) {
918 /*
919 * Determine if a sufficient number
920 * of subsequent blocks to satisfy
921 * the allocation request are free.
922 */
923 pa = VM_PAGE_TO_PHYS(m_ret);
924 pa_last = pa + size;
925 for (;;) {
926 pa += 1 << (PAGE_SHIFT + VM_NFREEORDER - 1);
927 if (pa >= pa_last)
928 break;
929 if (pa < seg->start ||
930 pa >= seg->end)
931 break;
932 m = &seg->first_page[atop(pa - seg->start)];
933 if (m->order != VM_NFREEORDER - 1)
934 break;
935 }
936 /* If not, continue to the next block. */
937 if (pa < pa_last)
938 continue;
939 }
940
941 /*
942 * Determine if the blocks are within the given range,
943 * satisfy the given alignment, and do not cross the
944 * given boundary.
945 */
946 pa = VM_PAGE_TO_PHYS(m_ret);
947 if (pa >= low &&
948 pa + size <= high &&
949 (pa & (alignment - 1)) == 0 &&
950 ((pa ^ (pa + size - 1)) & ~(boundary - 1)) == 0)
951 goto done;
952 }
953 }
954 }
955 }
956 if (++dom < vm_ndomains)
957 goto restartdom;
958 return (NULL);
959done:
960 for (m = m_ret; m < &m_ret[npages]; m = &m[1 << oind]) {
961 fl = (*seg->free_queues)[m->pool];
962 vm_freelist_rem(fl, m, m->order);
963 }
964 if (m_ret->pool != VM_FREEPOOL_DEFAULT)
965 vm_phys_set_pool(VM_FREEPOOL_DEFAULT, m_ret, oind);
966 fl = (*seg->free_queues)[m_ret->pool];
967 vm_phys_split_pages(m_ret, oind, fl, order);
968 /* Return excess pages to the free lists. */
969 npages_end = roundup2(npages, 1 << imin(oind, order));
970 if (npages < npages_end)
971 vm_phys_free_contig(&m_ret[npages], npages_end - npages);
972 return (m_ret);
973}
974
975#ifdef DDB
976/*
977 * Show the number of physical pages in each of the free lists.
978 */
979DB_SHOW_COMMAND(freepages, db_show_freepages)
980{
981 struct vm_freelist *fl;
982 int flind, oind, pind, dom;
983
984 for (dom = 0; dom < vm_ndomains; dom++) {
985 db_printf("DOMAIN: %d\n", dom);
986 for (flind = 0; flind < vm_nfreelists; flind++) {
987 db_printf("FREE LIST %d:\n"
988 "\n ORDER (SIZE) | NUMBER"
989 "\n ", flind);
990 for (pind = 0; pind < VM_NFREEPOOL; pind++)
991 db_printf(" | POOL %d", pind);
992 db_printf("\n-- ");
993 for (pind = 0; pind < VM_NFREEPOOL; pind++)
994 db_printf("-- -- ");
995 db_printf("--\n");
996 for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
997 db_printf(" %2.2d (%6.6dK)", oind,
998 1 << (PAGE_SHIFT - 10 + oind));
999 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
1000 fl = vm_phys_free_queues[dom][flind][pind];
1001 db_printf(" | %6.6d", fl[oind].lcnt);
1002 }
1003 db_printf("\n");
1004 }
1005 db_printf("\n");
1006 }
1007 db_printf("\n");
1008 }
1009}
1010#endif