Cross Reference: /freebsd-10.2-release/sys/vm/vm

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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 $");

40__FBSDID("$FreeBSD: stable/10/sys/vm/vm_phys.c 285634 2015-07-16 14:41:58Z kib $");

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;

90static int vm_nfreelists;

92/*
93 * Provides the mapping from VM_FREELIST_* to free list indices (flind).
94 */
95static int vm_freelist_to_flind[VM_NFREELIST];
96
97CTASSERT(VM_FREELIST_DEFAULT == 0);
98
99#ifdef VM_FREELIST_ISADMA
100#define VM_ISADMA_BOUNDARY 16777216
101#endif
102#ifdef VM_FREELIST_DMA32
103#define VM_DMA32_BOUNDARY ((vm_paddr_t)1 << 32)
104#endif
105
106/*
107 * Enforce the assumptions made by vm_phys_add_seg() and vm_phys_init() about
108 * the ordering of the free list boundaries.
109 */
110#if defined(VM_ISADMA_BOUNDARY) && defined(VM_LOWMEM_BOUNDARY)
111CTASSERT(VM_ISADMA_BOUNDARY < VM_LOWMEM_BOUNDARY);
112#endif
113#if defined(VM_LOWMEM_BOUNDARY) && defined(VM_DMA32_BOUNDARY)
114CTASSERT(VM_LOWMEM_BOUNDARY < VM_DMA32_BOUNDARY);
115#endif
116

117static int cnt_prezero;
118SYSCTL_INT(_vm_stats_misc, OID_AUTO, cnt_prezero, CTLFLAG_RD,
119 &cnt_prezero, 0, "The number of physical pages prezeroed at idle time");
120
121static int sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS);
122SYSCTL_OID(_vm, OID_AUTO, phys_free, CTLTYPE_STRING | CTLFLAG_RD,
123 NULL, 0, sysctl_vm_phys_free, "A", "Phys Free Info");
124
125static int sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS);
126SYSCTL_OID(_vm, OID_AUTO, phys_segs, CTLTYPE_STRING | CTLFLAG_RD,
127 NULL, 0, sysctl_vm_phys_segs, "A", "Phys Seg Info");
128
129SYSCTL_INT(_vm, OID_AUTO, ndomains, CTLFLAG_RD,
130 &vm_ndomains, 0, "Number of physical memory domains available.");
131
132static vm_page_t vm_phys_alloc_domain_pages(int domain, int flind, int pool,
133 int order);

~~109~~static void _vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind,
~~110~~ int domain);
~~111~~static void vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind);

134static void _vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int domain);
135static void vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end);

136static int vm_phys_paddr_to_segind(vm_paddr_t pa);
137static void vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl,
138 int order);
139
140static __inline int
141vm_rr_selectdomain(void)
142{
143#if MAXMEMDOM > 1
144 struct thread *td;
145
146 td = curthread;
147
148 td->td_dom_rr_idx++;
149 td->td_dom_rr_idx %= vm_ndomains;
150 return (td->td_dom_rr_idx);
151#else
152 return (0);
153#endif
154}
155
156boolean_t
157vm_phys_domain_intersects(long mask, vm_paddr_t low, vm_paddr_t high)
158{
159 struct vm_phys_seg *s;
160 int idx;
161
162 while ((idx = ffsl(mask)) != 0) {
163 idx--; /* ffsl counts from 1 */
164 mask &= ~(1UL << idx);
165 s = &vm_phys_segs[idx];
166 if (low < s->end && high > s->start)
167 return (TRUE);
168 }
169 return (FALSE);
170}
171
172/*
173 * Outputs the state of the physical memory allocator, specifically,
174 * the amount of physical memory in each free list.
175 */
176static int
177sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS)
178{
179 struct sbuf sbuf;
180 struct vm_freelist *fl;
181 int dom, error, flind, oind, pind;
182
183 error = sysctl_wire_old_buffer(req, 0);
184 if (error != 0)
185 return (error);
186 sbuf_new_for_sysctl(&sbuf, NULL, 128 * vm_ndomains, req);
187 for (dom = 0; dom < vm_ndomains; dom++) {
188 sbuf_printf(&sbuf,"\nDOMAIN %d:\n", dom);
189 for (flind = 0; flind < vm_nfreelists; flind++) {
190 sbuf_printf(&sbuf, "\nFREE LIST %d:\n"
191 "\n ORDER (SIZE) | NUMBER"
192 "\n ", flind);
193 for (pind = 0; pind < VM_NFREEPOOL; pind++)
194 sbuf_printf(&sbuf, " | POOL %d", pind);
195 sbuf_printf(&sbuf, "\n-- ");
196 for (pind = 0; pind < VM_NFREEPOOL; pind++)
197 sbuf_printf(&sbuf, "-- -- ");
198 sbuf_printf(&sbuf, "--\n");
199 for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
200 sbuf_printf(&sbuf, " %2d (%6dK)", oind,
201 1 << (PAGE_SHIFT - 10 + oind));
202 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
203 fl = vm_phys_free_queues[dom][flind][pind];
204 sbuf_printf(&sbuf, " | %6d",
205 fl[oind].lcnt);
206 }
207 sbuf_printf(&sbuf, "\n");
208 }
209 }
210 }
211 error = sbuf_finish(&sbuf);
212 sbuf_delete(&sbuf);
213 return (error);
214}
215
216/*
217 * Outputs the set of physical memory segments.
218 */
219static int
220sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS)
221{
222 struct sbuf sbuf;
223 struct vm_phys_seg *seg;
224 int error, segind;
225
226 error = sysctl_wire_old_buffer(req, 0);
227 if (error != 0)
228 return (error);
229 sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
230 for (segind = 0; segind < vm_phys_nsegs; segind++) {
231 sbuf_printf(&sbuf, "\nSEGMENT %d:\n\n", segind);
232 seg = &vm_phys_segs[segind];
233 sbuf_printf(&sbuf, "start: %#jx\n",
234 (uintmax_t)seg->start);
235 sbuf_printf(&sbuf, "end: %#jx\n",
236 (uintmax_t)seg->end);
237 sbuf_printf(&sbuf, "domain: %d\n", seg->domain);
238 sbuf_printf(&sbuf, "free list: %p\n", seg->free_queues);
239 }
240 error = sbuf_finish(&sbuf);
241 sbuf_delete(&sbuf);
242 return (error);
243}
244
245static void
246vm_freelist_add(struct vm_freelist *fl, vm_page_t m, int order, int tail)
247{
248
249 m->order = order;
250 if (tail)
251 TAILQ_INSERT_TAIL(&fl[order].pl, m, plinks.q);
252 else
253 TAILQ_INSERT_HEAD(&fl[order].pl, m, plinks.q);
254 fl[order].lcnt++;
255}
256
257static void
258vm_freelist_rem(struct vm_freelist *fl, vm_page_t m, int order)
259{
260
261 TAILQ_REMOVE(&fl[order].pl, m, plinks.q);
262 fl[order].lcnt--;
263 m->order = VM_NFREEORDER;
264}
265
266/*
267 * Create a physical memory segment.
268 */
269static void

~~246~~_vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind, int domain)

270_vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int domain)

271{
272 struct vm_phys_seg *seg;
273
274 KASSERT(vm_phys_nsegs < VM_PHYSSEG_MAX,
275 ("vm_phys_create_seg: increase VM_PHYSSEG_MAX"));
276 KASSERT(domain < vm_ndomains,
277 ("vm_phys_create_seg: invalid domain provided"));
278 seg = &vm_phys_segs[vm_phys_nsegs++];
279 while (seg > vm_phys_segs && (seg - 1)->start >= end) {
280 *seg = *(seg - 1);
281 seg--;
282 }
283 seg->start = start;
284 seg->end = end;
285 seg->domain = domain;

~~262~~ seg->free_queues = &vm_phys_free_queues[domain][flind];

286}
287
288static void

~~266~~vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind)

289vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end)

290{
291 int i;
292
293 if (mem_affinity == NULL) {

~~271~~ _vm_phys_create_seg(start, end, flind, 0);

294 _vm_phys_create_seg(start, end, 0);

295 return;
296 }
297
298 for (i = 0;; i++) {
299 if (mem_affinity[i].end == 0)
300 panic("Reached end of affinity info");
301 if (mem_affinity[i].end <= start)
302 continue;
303 if (mem_affinity[i].start > start)
304 panic("No affinity info for start %jx",
305 (uintmax_t)start);
306 if (mem_affinity[i].end >= end) {

~~284~~ _vm_phys_create_seg(start, end, flind,

307 _vm_phys_create_seg(start, end,

308 mem_affinity[i].domain);
309 break;
310 }

~~288~~ _vm_phys_create_seg(start, mem_affinity[i].end, flind,

311 _vm_phys_create_seg(start, mem_affinity[i].end,

312 mem_affinity[i].domain);
313 start = mem_affinity[i].end;
314 }
315}
316
317/*
318 * Add a physical memory segment.
319 */
320void
321vm_phys_add_seg(vm_paddr_t start, vm_paddr_t end)
322{

323 vm_paddr_t paddr;

324
325 KASSERT((start & PAGE_MASK) == 0,
326 ("vm_phys_define_seg: start is not page aligned"));
327 KASSERT((end & PAGE_MASK) == 0,
328 ("vm_phys_define_seg: end is not page aligned"));

329
330 /*
331 * Split the physical memory segment if it spans two or more free
332 * list boundaries.
333 */
334 paddr = start;

335#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

336 if (paddr < VM_ISADMA_BOUNDARY && end > VM_ISADMA_BOUNDARY) {
337 vm_phys_create_seg(paddr, VM_ISADMA_BOUNDARY);
338 paddr = VM_ISADMA_BOUNDARY;
339 }

340#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

341#ifdef VM_FREELIST_LOWMEM
342 if (paddr < VM_LOWMEM_BOUNDARY && end > VM_LOWMEM_BOUNDARY) {
343 vm_phys_create_seg(paddr, VM_LOWMEM_BOUNDARY);
344 paddr = VM_LOWMEM_BOUNDARY;
345 }

346#endif

~~330~~ vm_phys_create_seg(start, end, VM_FREELIST_DEFAULT);

347#ifdef VM_FREELIST_DMA32
348 if (paddr < VM_DMA32_BOUNDARY && end > VM_DMA32_BOUNDARY) {
349 vm_phys_create_seg(paddr, VM_DMA32_BOUNDARY);
350 paddr = VM_DMA32_BOUNDARY;
351 }
352#endif
353 vm_phys_create_seg(paddr, end);

354}
355
356/*
357 * Initialize the physical memory allocator.

358 *
359 * Requires that vm_page_array is initialized!

360 */
361void
362vm_phys_init(void)
363{
364 struct vm_freelist *fl;
365 struct vm_phys_seg *seg;

~~341~~#ifdef VM_PHYSSEG_SPARSE
~~342~~ long pages;

366 u_long npages;
367 int dom, flind, freelist, oind, pind, segind;
368
369 /*
370 * Compute the number of free lists, and generate the mapping from the
371 * manifest constants VM_FREELIST_* to the free list indices.
372 *
373 * Initially, the entries of vm_freelist_to_flind[] are set to either
374 * 0 or 1 to indicate which free lists should be created.
375 */
376 npages = 0;
377 for (segind = vm_phys_nsegs - 1; segind >= 0; segind--) {
378 seg = &vm_phys_segs[segind];
379#ifdef VM_FREELIST_ISADMA
380 if (seg->end <= VM_ISADMA_BOUNDARY)
381 vm_freelist_to_flind[VM_FREELIST_ISADMA] = 1;
382 else

383#endif

~~344~~ int dom, flind, oind, pind, segind;

384#ifdef VM_FREELIST_LOWMEM
385 if (seg->end <= VM_LOWMEM_BOUNDARY)
386 vm_freelist_to_flind[VM_FREELIST_LOWMEM] = 1;
387 else
388#endif
389#ifdef VM_FREELIST_DMA32
390 if (
391#ifdef VM_DMA32_NPAGES_THRESHOLD
392 /*
393 * Create the DMA32 free list only if the amount of
394 * physical memory above physical address 4G exceeds the
395 * given threshold.
396 */
397 npages > VM_DMA32_NPAGES_THRESHOLD &&
398#endif
399 seg->end <= VM_DMA32_BOUNDARY)
400 vm_freelist_to_flind[VM_FREELIST_DMA32] = 1;
401 else
402#endif
403 {
404 npages += atop(seg->end - seg->start);
405 vm_freelist_to_flind[VM_FREELIST_DEFAULT] = 1;
406 }
407 }
408 /* Change each entry into a running total of the free lists. */
409 for (freelist = 1; freelist < VM_NFREELIST; freelist++) {
410 vm_freelist_to_flind[freelist] +=
411 vm_freelist_to_flind[freelist - 1];
412 }
413 vm_nfreelists = vm_freelist_to_flind[VM_NFREELIST - 1];
414 KASSERT(vm_nfreelists > 0, ("vm_phys_init: no free lists"));
415 /* Change each entry into a free list index. */
416 for (freelist = 0; freelist < VM_NFREELIST; freelist++)
417 vm_freelist_to_flind[freelist]--;

418

419 /*
420 * Initialize the first_page and free_queues fields of each physical
421 * memory segment.
422 */

423#ifdef VM_PHYSSEG_SPARSE

~~347~~ pages = 0;

424 npages = 0;

425#endif
426 for (segind = 0; segind < vm_phys_nsegs; segind++) {
427 seg = &vm_phys_segs[segind];
428#ifdef VM_PHYSSEG_SPARSE

~~352~~ seg->first_page = &vm_page_array[pages];
~~353~~ pages += atop(seg->end - seg->start);

429 seg->first_page = &vm_page_array[npages];
430 npages += atop(seg->end - seg->start);

431#else
432 seg->first_page = PHYS_TO_VM_PAGE(seg->start);
433#endif

434#ifdef VM_FREELIST_ISADMA
435 if (seg->end <= VM_ISADMA_BOUNDARY) {
436 flind = vm_freelist_to_flind[VM_FREELIST_ISADMA];
437 KASSERT(flind >= 0,
438 ("vm_phys_init: ISADMA flind < 0"));
439 } else
440#endif
441#ifdef VM_FREELIST_LOWMEM
442 if (seg->end <= VM_LOWMEM_BOUNDARY) {
443 flind = vm_freelist_to_flind[VM_FREELIST_LOWMEM];
444 KASSERT(flind >= 0,
445 ("vm_phys_init: LOWMEM flind < 0"));
446 } else
447#endif
448#ifdef VM_FREELIST_DMA32
449 if (seg->end <= VM_DMA32_BOUNDARY) {
450 flind = vm_freelist_to_flind[VM_FREELIST_DMA32];
451 KASSERT(flind >= 0,
452 ("vm_phys_init: DMA32 flind < 0"));
453 } else
454#endif
455 {
456 flind = vm_freelist_to_flind[VM_FREELIST_DEFAULT];
457 KASSERT(flind >= 0,
458 ("vm_phys_init: DEFAULT flind < 0"));
459 }
460 seg->free_queues = &vm_phys_free_queues[seg->domain][flind];

461 }

462
463 /*
464 * Initialize the free queues.
465 */

466 for (dom = 0; dom < vm_ndomains; dom++) {
467 for (flind = 0; flind < vm_nfreelists; flind++) {
468 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
469 fl = vm_phys_free_queues[dom][flind][pind];
470 for (oind = 0; oind < VM_NFREEORDER; oind++)
471 TAILQ_INIT(&fl[oind].pl);
472 }
473 }
474 }
475 mtx_init(&vm_phys_fictitious_reg_mtx, "vmfctr", NULL, MTX_DEF);
476}
477
478/*
479 * Split a contiguous, power of two-sized set of physical pages.
480 */
481static __inline void
482vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl, int order)
483{
484 vm_page_t m_buddy;
485
486 while (oind > order) {
487 oind--;
488 m_buddy = &m[1 << oind];
489 KASSERT(m_buddy->order == VM_NFREEORDER,
490 ("vm_phys_split_pages: page %p has unexpected order %d",
491 m_buddy, m_buddy->order));
492 vm_freelist_add(fl, m_buddy, oind, 0);
493 }
494}
495
496/*
497 * Initialize a physical page and add it to the free lists.
498 */
499void
500vm_phys_add_page(vm_paddr_t pa)
501{
502 vm_page_t m;
503 struct vm_domain *vmd;
504
505 cnt.v_page_count++;
506 m = vm_phys_paddr_to_vm_page(pa);
507 m->phys_addr = pa;
508 m->queue = PQ_NONE;
509 m->segind = vm_phys_paddr_to_segind(pa);
510 vmd = vm_phys_domain(m);
511 vmd->vmd_page_count++;
512 vmd->vmd_segs |= 1UL << m->segind;
513 m->flags = PG_FREE;
514 KASSERT(m->order == VM_NFREEORDER,
515 ("vm_phys_add_page: page %p has unexpected order %d",
516 m, m->order));
517 m->pool = VM_FREEPOOL_DEFAULT;
518 pmap_page_init(m);
519 mtx_lock(&vm_page_queue_free_mtx);
520 vm_phys_freecnt_adj(m, 1);
521 vm_phys_free_pages(m, 0);
522 mtx_unlock(&vm_page_queue_free_mtx);
523}
524
525/*
526 * Allocate a contiguous, power of two-sized set of physical pages
527 * from the free lists.
528 *
529 * The free page queues must be locked.
530 */
531vm_page_t
532vm_phys_alloc_pages(int pool, int order)
533{
534 vm_page_t m;
535 int dom, domain, flind;
536
537 KASSERT(pool < VM_NFREEPOOL,
538 ("vm_phys_alloc_pages: pool %d is out of range", pool));
539 KASSERT(order < VM_NFREEORDER,
540 ("vm_phys_alloc_pages: order %d is out of range", order));
541
542 for (dom = 0; dom < vm_ndomains; dom++) {
543 domain = vm_rr_selectdomain();
544 for (flind = 0; flind < vm_nfreelists; flind++) {
545 m = vm_phys_alloc_domain_pages(domain, flind, pool,
546 order);
547 if (m != NULL)
548 return (m);
549 }
550 }
551 return (NULL);
552}
553
554/*

~~447~~ * Find and dequeue a free page on the given free list, with the
~~448~~ * specified pool and order

555 * Allocate a contiguous, power of two-sized set of physical pages from the
556 * specified free list. The free list must be specified using one of the
557 * manifest constants VM_FREELIST_*.
558 *
559 * The free page queues must be locked.

560 */
561vm_page_t

~~451~~vm_phys_alloc_freelist_pages(int flind, int pool, int order)

562vm_phys_alloc_freelist_pages(int freelist, int pool, int order)

563{
564 vm_page_t m;
565 int dom, domain;
566

~~456~~ KASSERT(flind < VM_NFREELIST,
~~457~~ ("vm_phys_alloc_freelist_pages: freelist %d is out of range", flind));

567 KASSERT(freelist < VM_NFREELIST,
568 ("vm_phys_alloc_freelist_pages: freelist %d is out of range",
569 freelist));

570 KASSERT(pool < VM_NFREEPOOL,
571 ("vm_phys_alloc_freelist_pages: pool %d is out of range", pool));
572 KASSERT(order < VM_NFREEORDER,
573 ("vm_phys_alloc_freelist_pages: order %d is out of range", order));

~~462~~

574 for (dom = 0; dom < vm_ndomains; dom++) {
575 domain = vm_rr_selectdomain();

~~465~~ m = vm_phys_alloc_domain_pages(domain, flind, pool, order);

576 m = vm_phys_alloc_domain_pages(domain,
577 vm_freelist_to_flind[freelist], pool, order);

578 if (m != NULL)
579 return (m);
580 }
581 return (NULL);
582}
583
584static vm_page_t
585vm_phys_alloc_domain_pages(int domain, int flind, int pool, int order)
586{
587 struct vm_freelist *fl;
588 struct vm_freelist *alt;
589 int oind, pind;
590 vm_page_t m;
591
592 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
593 fl = &vm_phys_free_queues[domain][flind][pool][0];
594 for (oind = order; oind < VM_NFREEORDER; oind++) {
595 m = TAILQ_FIRST(&fl[oind].pl);
596 if (m != NULL) {
597 vm_freelist_rem(fl, m, oind);
598 vm_phys_split_pages(m, oind, fl, order);
599 return (m);
600 }
601 }
602
603 /*
604 * The given pool was empty. Find the largest
605 * contiguous, power-of-two-sized set of pages in any
606 * pool. Transfer these pages to the given pool, and
607 * use them to satisfy the allocation.
608 */
609 for (oind = VM_NFREEORDER - 1; oind >= order; oind--) {
610 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
611 alt = &vm_phys_free_queues[domain][flind][pind][0];
612 m = TAILQ_FIRST(&alt[oind].pl);
613 if (m != NULL) {
614 vm_freelist_rem(alt, m, oind);
615 vm_phys_set_pool(pool, m, oind);
616 vm_phys_split_pages(m, oind, fl, order);
617 return (m);
618 }
619 }
620 }
621 return (NULL);
622}
623
624/*
625 * Find the vm_page corresponding to the given physical address.
626 */
627vm_page_t
628vm_phys_paddr_to_vm_page(vm_paddr_t pa)
629{
630 struct vm_phys_seg *seg;
631 int segind;
632
633 for (segind = 0; segind < vm_phys_nsegs; segind++) {
634 seg = &vm_phys_segs[segind];
635 if (pa >= seg->start && pa < seg->end)
636 return (&seg->first_page[atop(pa - seg->start)]);
637 }
638 return (NULL);
639}
640
641vm_page_t
642vm_phys_fictitious_to_vm_page(vm_paddr_t pa)
643{
644 struct vm_phys_fictitious_seg *seg;
645 vm_page_t m;
646 int segind;
647
648 m = NULL;
649 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
650 seg = &vm_phys_fictitious_segs[segind];
651 if (pa >= seg->start && pa < seg->end) {
652 m = &seg->first_page[atop(pa - seg->start)];
653 KASSERT((m->flags & PG_FICTITIOUS) != 0,
654 ("%p not fictitious", m));
655 break;
656 }
657 }
658 return (m);
659}
660
661int
662vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
663 vm_memattr_t memattr)
664{
665 struct vm_phys_fictitious_seg *seg;
666 vm_page_t fp;
667 long i, page_count;
668 int segind;
669#ifdef VM_PHYSSEG_DENSE
670 long pi;
671 boolean_t malloced;
672#endif
673
674 page_count = (end - start) / PAGE_SIZE;
675
676#ifdef VM_PHYSSEG_DENSE
677 pi = atop(start);
678 if (pi >= first_page && pi < vm_page_array_size + first_page) {
679 if (atop(end) >= vm_page_array_size + first_page)
680 return (EINVAL);
681 fp = &vm_page_array[pi - first_page];
682 malloced = FALSE;
683 } else
684#endif
685 {
686 fp = malloc(page_count * sizeof(struct vm_page), M_FICT_PAGES,
687 M_WAITOK | M_ZERO);
688#ifdef VM_PHYSSEG_DENSE
689 malloced = TRUE;
690#endif
691 }
692 for (i = 0; i < page_count; i++) {
693 vm_page_initfake(&fp[i], start + PAGE_SIZE * i, memattr);
694 fp[i].oflags &= ~VPO_UNMANAGED;
695 fp[i].busy_lock = VPB_UNBUSIED;
696 }
697 mtx_lock(&vm_phys_fictitious_reg_mtx);
698 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
699 seg = &vm_phys_fictitious_segs[segind];
700 if (seg->start == 0 && seg->end == 0) {
701 seg->start = start;
702 seg->end = end;
703 seg->first_page = fp;
704 mtx_unlock(&vm_phys_fictitious_reg_mtx);
705 return (0);
706 }
707 }
708 mtx_unlock(&vm_phys_fictitious_reg_mtx);
709#ifdef VM_PHYSSEG_DENSE
710 if (malloced)
711#endif
712 free(fp, M_FICT_PAGES);
713 return (EBUSY);
714}
715
716void
717vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end)
718{
719 struct vm_phys_fictitious_seg *seg;
720 vm_page_t fp;
721 int segind;
722#ifdef VM_PHYSSEG_DENSE
723 long pi;
724#endif
725
726#ifdef VM_PHYSSEG_DENSE
727 pi = atop(start);
728#endif
729
730 mtx_lock(&vm_phys_fictitious_reg_mtx);
731 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
732 seg = &vm_phys_fictitious_segs[segind];
733 if (seg->start == start && seg->end == end) {
734 seg->start = seg->end = 0;
735 fp = seg->first_page;
736 seg->first_page = NULL;
737 mtx_unlock(&vm_phys_fictitious_reg_mtx);
738#ifdef VM_PHYSSEG_DENSE
739 if (pi < first_page || atop(end) >= vm_page_array_size)
740#endif
741 free(fp, M_FICT_PAGES);
742 return;
743 }
744 }
745 mtx_unlock(&vm_phys_fictitious_reg_mtx);
746 KASSERT(0, ("Unregistering not registered fictitious range"));
747}
748
749/*
750 * Find the segment containing the given physical address.
751 */
752static int
753vm_phys_paddr_to_segind(vm_paddr_t pa)
754{
755 struct vm_phys_seg *seg;
756 int segind;
757
758 for (segind = 0; segind < vm_phys_nsegs; segind++) {
759 seg = &vm_phys_segs[segind];
760 if (pa >= seg->start && pa < seg->end)
761 return (segind);
762 }
763 panic("vm_phys_paddr_to_segind: paddr %#jx is not in any segment" ,
764 (uintmax_t)pa);
765}
766
767/*
768 * Free a contiguous, power of two-sized set of physical pages.
769 *
770 * The free page queues must be locked.
771 */
772void
773vm_phys_free_pages(vm_page_t m, int order)
774{
775 struct vm_freelist *fl;
776 struct vm_phys_seg *seg;
777 vm_paddr_t pa;
778 vm_page_t m_buddy;
779
780 KASSERT(m->order == VM_NFREEORDER,
781 ("vm_phys_free_pages: page %p has unexpected order %d",
782 m, m->order));
783 KASSERT(m->pool < VM_NFREEPOOL,
784 ("vm_phys_free_pages: page %p has unexpected pool %d",
785 m, m->pool));
786 KASSERT(order < VM_NFREEORDER,
787 ("vm_phys_free_pages: order %d is out of range", order));
788 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
789 seg = &vm_phys_segs[m->segind];
790 if (order < VM_NFREEORDER - 1) {
791 pa = VM_PAGE_TO_PHYS(m);
792 do {
793 pa ^= ((vm_paddr_t)1 << (PAGE_SHIFT + order));
794 if (pa < seg->start || pa >= seg->end)
795 break;
796 m_buddy = &seg->first_page[atop(pa - seg->start)];
797 if (m_buddy->order != order)
798 break;
799 fl = (*seg->free_queues)[m_buddy->pool];
800 vm_freelist_rem(fl, m_buddy, order);
801 if (m_buddy->pool != m->pool)
802 vm_phys_set_pool(m->pool, m_buddy, order);
803 order++;
804 pa &= ~(((vm_paddr_t)1 << (PAGE_SHIFT + order)) - 1);
805 m = &seg->first_page[atop(pa - seg->start)];
806 } while (order < VM_NFREEORDER - 1);
807 }
808 fl = (*seg->free_queues)[m->pool];
809 vm_freelist_add(fl, m, order, 1);
810}
811
812/*
813 * Free a contiguous, arbitrarily sized set of physical pages.
814 *
815 * The free page queues must be locked.
816 */
817void
818vm_phys_free_contig(vm_page_t m, u_long npages)
819{
820 u_int n;
821 int order;
822
823 /*
824 * Avoid unnecessary coalescing by freeing the pages in the largest
825 * possible power-of-two-sized subsets.
826 */
827 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
828 for (;; npages -= n) {
829 /*
830 * Unsigned "min" is used here so that "order" is assigned
831 * "VM_NFREEORDER - 1" when "m"'s physical address is zero
832 * or the low-order bits of its physical address are zero
833 * because the size of a physical address exceeds the size of
834 * a long.
835 */
836 order = min(ffsl(VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT) - 1,
837 VM_NFREEORDER - 1);
838 n = 1 << order;
839 if (npages < n)
840 break;
841 vm_phys_free_pages(m, order);
842 m += n;
843 }
844 /* The residual "npages" is less than "1 << (VM_NFREEORDER - 1)". */
845 for (; npages > 0; npages -= n) {
846 order = flsl(npages) - 1;
847 n = 1 << order;
848 vm_phys_free_pages(m, order);
849 m += n;
850 }
851}
852
853/*
854 * Set the pool for a contiguous, power of two-sized set of physical pages.
855 */
856void
857vm_phys_set_pool(int pool, vm_page_t m, int order)
858{
859 vm_page_t m_tmp;
860
861 for (m_tmp = m; m_tmp < &m[1 << order]; m_tmp++)
862 m_tmp->pool = pool;
863}
864
865/*
866 * Search for the given physical page "m" in the free lists. If the search
867 * succeeds, remove "m" from the free lists and return TRUE. Otherwise, return
868 * FALSE, indicating that "m" is not in the free lists.
869 *
870 * The free page queues must be locked.
871 */
872boolean_t
873vm_phys_unfree_page(vm_page_t m)
874{
875 struct vm_freelist *fl;
876 struct vm_phys_seg *seg;
877 vm_paddr_t pa, pa_half;
878 vm_page_t m_set, m_tmp;
879 int order;
880
881 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
882
883 /*
884 * First, find the contiguous, power of two-sized set of free
885 * physical pages containing the given physical page "m" and
886 * assign it to "m_set".
887 */
888 seg = &vm_phys_segs[m->segind];
889 for (m_set = m, order = 0; m_set->order == VM_NFREEORDER &&
890 order < VM_NFREEORDER - 1; ) {
891 order++;
892 pa = m->phys_addr & (~(vm_paddr_t)0 << (PAGE_SHIFT + order));
893 if (pa >= seg->start)
894 m_set = &seg->first_page[atop(pa - seg->start)];
895 else
896 return (FALSE);
897 }
898 if (m_set->order < order)
899 return (FALSE);
900 if (m_set->order == VM_NFREEORDER)
901 return (FALSE);
902 KASSERT(m_set->order < VM_NFREEORDER,
903 ("vm_phys_unfree_page: page %p has unexpected order %d",
904 m_set, m_set->order));
905
906 /*
907 * Next, remove "m_set" from the free lists. Finally, extract
908 * "m" from "m_set" using an iterative algorithm: While "m_set"
909 * is larger than a page, shrink "m_set" by returning the half
910 * of "m_set" that does not contain "m" to the free lists.
911 */
912 fl = (*seg->free_queues)[m_set->pool];
913 order = m_set->order;
914 vm_freelist_rem(fl, m_set, order);
915 while (order > 0) {
916 order--;
917 pa_half = m_set->phys_addr ^ (1 << (PAGE_SHIFT + order));
918 if (m->phys_addr < pa_half)
919 m_tmp = &seg->first_page[atop(pa_half - seg->start)];
920 else {
921 m_tmp = m_set;
922 m_set = &seg->first_page[atop(pa_half - seg->start)];
923 }
924 vm_freelist_add(fl, m_tmp, order, 0);
925 }
926 KASSERT(m_set == m, ("vm_phys_unfree_page: fatal inconsistency"));
927 return (TRUE);
928}
929
930/*
931 * Try to zero one physical page. Used by an idle priority thread.
932 */
933boolean_t
934vm_phys_zero_pages_idle(void)
935{
936 static struct vm_freelist *fl;
937 static int flind, oind, pind;
938 vm_page_t m, m_tmp;
939 int domain;
940
941 domain = vm_rr_selectdomain();
942 fl = vm_phys_free_queues[domain][0][0];
943 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
944 for (;;) {
945 TAILQ_FOREACH_REVERSE(m, &fl[oind].pl, pglist, plinks.q) {
946 for (m_tmp = m; m_tmp < &m[1 << oind]; m_tmp++) {
947 if ((m_tmp->flags & (PG_CACHED | PG_ZERO)) == 0) {
948 vm_phys_unfree_page(m_tmp);
949 vm_phys_freecnt_adj(m, -1);
950 mtx_unlock(&vm_page_queue_free_mtx);
951 pmap_zero_page_idle(m_tmp);
952 m_tmp->flags |= PG_ZERO;
953 mtx_lock(&vm_page_queue_free_mtx);
954 vm_phys_freecnt_adj(m, 1);
955 vm_phys_free_pages(m_tmp, 0);
956 vm_page_zero_count++;
957 cnt_prezero++;
958 return (TRUE);
959 }
960 }
961 }
962 oind++;
963 if (oind == VM_NFREEORDER) {
964 oind = 0;
965 pind++;
966 if (pind == VM_NFREEPOOL) {
967 pind = 0;
968 flind++;
969 if (flind == vm_nfreelists)
970 flind = 0;
971 }
972 fl = vm_phys_free_queues[domain][flind][pind];
973 }
974 }
975}
976
977/*
978 * Allocate a contiguous set of physical pages of the given size
979 * "npages" from the free lists. All of the physical pages must be at
980 * or above the given physical address "low" and below the given
981 * physical address "high". The given value "alignment" determines the
982 * alignment of the first physical page in the set. If the given value
983 * "boundary" is non-zero, then the set of physical pages cannot cross
984 * any physical address boundary that is a multiple of that value. Both
985 * "alignment" and "boundary" must be a power of two.
986 */
987vm_page_t
988vm_phys_alloc_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
989 u_long alignment, vm_paddr_t boundary)
990{
991 struct vm_freelist *fl;
992 struct vm_phys_seg *seg;
993 vm_paddr_t pa, pa_last, size;
994 vm_page_t m, m_ret;
995 u_long npages_end;
996 int dom, domain, flind, oind, order, pind;
997
998 mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
999 size = npages << PAGE_SHIFT;
1000 KASSERT(size != 0,
1001 ("vm_phys_alloc_contig: size must not be 0"));
1002 KASSERT((alignment & (alignment - 1)) == 0,
1003 ("vm_phys_alloc_contig: alignment must be a power of 2"));
1004 KASSERT((boundary & (boundary - 1)) == 0,
1005 ("vm_phys_alloc_contig: boundary must be a power of 2"));
1006 /* Compute the queue that is the best fit for npages. */
1007 for (order = 0; (1 << order) < npages; order++);
1008 dom = 0;
1009restartdom:
1010 domain = vm_rr_selectdomain();
1011 for (flind = 0; flind < vm_nfreelists; flind++) {
1012 for (oind = min(order, VM_NFREEORDER - 1); oind < VM_NFREEORDER; oind++) {
1013 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
1014 fl = &vm_phys_free_queues[domain][flind][pind][0];
1015 TAILQ_FOREACH(m_ret, &fl[oind].pl, plinks.q) {
1016 /*
1017 * A free list may contain physical pages
1018 * from one or more segments.
1019 */
1020 seg = &vm_phys_segs[m_ret->segind];
1021 if (seg->start > high ||
1022 low >= seg->end)
1023 continue;
1024
1025 /*
1026 * Is the size of this allocation request
1027 * larger than the largest block size?
1028 */
1029 if (order >= VM_NFREEORDER) {
1030 /*
1031 * Determine if a sufficient number
1032 * of subsequent blocks to satisfy
1033 * the allocation request are free.
1034 */
1035 pa = VM_PAGE_TO_PHYS(m_ret);
1036 pa_last = pa + size;
1037 for (;;) {
1038 pa += 1 << (PAGE_SHIFT + VM_NFREEORDER - 1);
1039 if (pa >= pa_last)
1040 break;
1041 if (pa < seg->start ||
1042 pa >= seg->end)
1043 break;
1044 m = &seg->first_page[atop(pa - seg->start)];
1045 if (m->order != VM_NFREEORDER - 1)
1046 break;
1047 }
1048 /* If not, continue to the next block. */
1049 if (pa < pa_last)
1050 continue;
1051 }
1052
1053 /*
1054 * Determine if the blocks are within the given range,
1055 * satisfy the given alignment, and do not cross the
1056 * given boundary.
1057 */
1058 pa = VM_PAGE_TO_PHYS(m_ret);
1059 if (pa >= low &&
1060 pa + size <= high &&
1061 (pa & (alignment - 1)) == 0 &&
1062 ((pa ^ (pa + size - 1)) & ~(boundary - 1)) == 0)
1063 goto done;
1064 }
1065 }
1066 }
1067 }
1068 if (++dom < vm_ndomains)
1069 goto restartdom;
1070 return (NULL);
1071done:
1072 for (m = m_ret; m < &m_ret[npages]; m = &m[1 << oind]) {
1073 fl = (*seg->free_queues)[m->pool];
1074 vm_freelist_rem(fl, m, m->order);
1075 }
1076 if (m_ret->pool != VM_FREEPOOL_DEFAULT)
1077 vm_phys_set_pool(VM_FREEPOOL_DEFAULT, m_ret, oind);
1078 fl = (*seg->free_queues)[m_ret->pool];
1079 vm_phys_split_pages(m_ret, oind, fl, order);
1080 /* Return excess pages to the free lists. */
1081 npages_end = roundup2(npages, 1 << imin(oind, order));
1082 if (npages < npages_end)
1083 vm_phys_free_contig(&m_ret[npages], npages_end - npages);
1084 return (m_ret);
1085}
1086
1087#ifdef DDB
1088/*
1089 * Show the number of physical pages in each of the free lists.
1090 */
1091DB_SHOW_COMMAND(freepages, db_show_freepages)
1092{
1093 struct vm_freelist *fl;
1094 int flind, oind, pind, dom;
1095
1096 for (dom = 0; dom < vm_ndomains; dom++) {
1097 db_printf("DOMAIN: %d\n", dom);
1098 for (flind = 0; flind < vm_nfreelists; flind++) {
1099 db_printf("FREE LIST %d:\n"
1100 "\n ORDER (SIZE) | NUMBER"
1101 "\n ", flind);
1102 for (pind = 0; pind < VM_NFREEPOOL; pind++)
1103 db_printf(" | POOL %d", pind);
1104 db_printf("\n-- ");
1105 for (pind = 0; pind < VM_NFREEPOOL; pind++)
1106 db_printf("-- -- ");
1107 db_printf("--\n");
1108 for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
1109 db_printf(" %2.2d (%6.6dK)", oind,
1110 1 << (PAGE_SHIFT - 10 + oind));
1111 for (pind = 0; pind < VM_NFREEPOOL; pind++) {
1112 fl = vm_phys_free_queues[dom][flind][pind];
1113 db_printf(" | %6.6d", fl[oind].lcnt);
1114 }
1115 db_printf("\n");
1116 }
1117 db_printf("\n");
1118 }
1119 db_printf("\n");
1120 }
1121}
1122#endif