sys/vm/vm_phys.c

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