1 /* 2 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Hiten Pandya <hmp@backplane.com>. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 */ 35 /* 36 * Copyright (c) 1991 Regents of the University of California. 37 * All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * The Mach Operating System project at Carnegie-Mellon University. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91 67 * $DragonFly: src/sys/vm/vm_contig.c,v 1.21 2006/12/28 21:24:02 dillon Exp $ 68 */ 69 70 /* 71 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 72 * All rights reserved. 73 * 74 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 75 * 76 * Permission to use, copy, modify and distribute this software and 77 * its documentation is hereby granted, provided that both the copyright 78 * notice and this permission notice appear in all copies of the 79 * software, derivative works or modified versions, and any portions 80 * thereof, and that both notices appear in supporting documentation. 81 * 82 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 83 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 84 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 85 * 86 * Carnegie Mellon requests users of this software to return to 87 * 88 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 89 * School of Computer Science 90 * Carnegie Mellon University 91 * Pittsburgh PA 15213-3890 92 * 93 * any improvements or extensions that they make and grant Carnegie the 94 * rights to redistribute these changes. 95 */ 96 97 /* 98 * Contiguous memory allocation API. 99 */ 100 101 #include <sys/param.h> 102 #include <sys/systm.h> 103 #include <sys/malloc.h> 104 #include <sys/proc.h> 105 #include <sys/lock.h> 106 #include <sys/vmmeter.h> 107 #include <sys/vnode.h> 108 109 #include <vm/vm.h> 110 #include <vm/vm_param.h> 111 #include <vm/vm_kern.h> 112 #include <vm/pmap.h> 113 #include <vm/vm_map.h> 114 #include <vm/vm_object.h> 115 #include <vm/vm_page.h> 116 #include <vm/vm_pageout.h> 117 #include <vm/vm_pager.h> 118 #include <vm/vm_extern.h> 119 120 #include <sys/thread2.h> 121 #include <sys/spinlock2.h> 122 #include <vm/vm_page2.h> 123 124 static void vm_contig_pg_free(int start, u_long size); 125 126 /* 127 * vm_contig_pg_clean: 128 * 129 * Do a thorough cleanup of the specified 'queue', which can be either 130 * PQ_ACTIVE or PQ_INACTIVE by doing a walkthrough. If the page is not 131 * marked dirty, it is shoved into the page cache, provided no one has 132 * currently aqcuired it, otherwise localized action per object type 133 * is taken for cleanup: 134 * 135 * In the OBJT_VNODE case, the whole page range is cleaned up 136 * using the vm_object_page_clean() routine, by specyfing a 137 * start and end of '0'. 138 * 139 * Otherwise if the object is of any other type, the generic 140 * pageout (daemon) flush routine is invoked. 141 */ 142 static void 143 vm_contig_pg_clean(int queue, int count) 144 { 145 vm_object_t object; 146 vm_page_t m, m_tmp; 147 struct vm_page marker; 148 struct vpgqueues *pq = &vm_page_queues[queue]; 149 150 /* 151 * Setup a local marker 152 */ 153 bzero(&marker, sizeof(marker)); 154 marker.flags = PG_BUSY | PG_FICTITIOUS | PG_MARKER; 155 marker.queue = queue; 156 marker.wire_count = 1; 157 158 vm_page_queues_spin_lock(queue); 159 TAILQ_INSERT_HEAD(&pq->pl, &marker, pageq); 160 vm_page_queues_spin_unlock(queue); 161 162 /* 163 * Iterate the queue. Note that the vm_page spinlock must be 164 * acquired before the pageq spinlock so it's easiest to simply 165 * not hold it in the loop iteration. 166 */ 167 while (count-- > 0 && (m = TAILQ_NEXT(&marker, pageq)) != NULL) { 168 vm_page_and_queue_spin_lock(m); 169 if (m != TAILQ_NEXT(&marker, pageq)) { 170 vm_page_and_queue_spin_unlock(m); 171 ++count; 172 continue; 173 } 174 KKASSERT(m->queue == queue); 175 176 TAILQ_REMOVE(&pq->pl, &marker, pageq); 177 TAILQ_INSERT_AFTER(&pq->pl, m, &marker, pageq); 178 179 if (m->flags & PG_MARKER) { 180 vm_page_and_queue_spin_unlock(m); 181 continue; 182 } 183 if (vm_page_busy_try(m, TRUE)) { 184 vm_page_and_queue_spin_unlock(m); 185 continue; 186 } 187 vm_page_and_queue_spin_unlock(m); 188 189 /* 190 * We've successfully busied the page 191 */ 192 if (m->queue - m->pc != queue) { 193 vm_page_wakeup(m); 194 continue; 195 } 196 if (m->wire_count || m->hold_count) { 197 vm_page_wakeup(m); 198 continue; 199 } 200 if ((object = m->object) == NULL) { 201 vm_page_wakeup(m); 202 continue; 203 } 204 vm_page_test_dirty(m); 205 if (m->dirty) { 206 vm_object_hold(object); 207 KKASSERT(m->object == object); 208 209 if (object->type == OBJT_VNODE) { 210 vm_page_wakeup(m); 211 vn_lock(object->handle, LK_EXCLUSIVE|LK_RETRY); 212 vm_object_page_clean(object, 0, 0, OBJPC_SYNC); 213 vn_unlock(((struct vnode *)object->handle)); 214 } else if (object->type == OBJT_SWAP || 215 object->type == OBJT_DEFAULT) { 216 m_tmp = m; 217 vm_pageout_flush(&m_tmp, 1, 0); 218 } else { 219 vm_page_wakeup(m); 220 } 221 vm_object_drop(object); 222 } else if (m->hold_count == 0) { 223 vm_page_cache(m); 224 } else { 225 vm_page_wakeup(m); 226 } 227 } 228 229 /* 230 * Scrap our local marker 231 */ 232 vm_page_queues_spin_lock(queue); 233 TAILQ_REMOVE(&pq->pl, &marker, pageq); 234 vm_page_queues_spin_unlock(queue); 235 } 236 237 /* 238 * vm_contig_pg_alloc: 239 * 240 * Allocate contiguous pages from the VM. This function does not 241 * map the allocated pages into the kernel map, otherwise it is 242 * impossible to make large allocations (i.e. >2G). 243 * 244 * Malloc()'s data structures have been used for collection of 245 * statistics and for allocations of less than a page. 246 */ 247 static int 248 vm_contig_pg_alloc(unsigned long size, vm_paddr_t low, vm_paddr_t high, 249 unsigned long alignment, unsigned long boundary, int mflags) 250 { 251 int i, q, start, pass; 252 vm_offset_t phys; 253 vm_page_t pga = vm_page_array; 254 vm_page_t m; 255 int pqtype; 256 257 size = round_page(size); 258 if (size == 0) 259 panic("vm_contig_pg_alloc: size must not be 0"); 260 if ((alignment & (alignment - 1)) != 0) 261 panic("vm_contig_pg_alloc: alignment must be a power of 2"); 262 if ((boundary & (boundary - 1)) != 0) 263 panic("vm_contig_pg_alloc: boundary must be a power of 2"); 264 265 /* 266 * See if we can get the pages from the contiguous page reserve 267 * alist. The returned pages will be allocated and wired but not 268 * busied. 269 */ 270 m = vm_page_alloc_contig(low, high, alignment, boundary, size); 271 if (m) 272 return (m - &pga[0]); 273 274 /* 275 * Three passes (0, 1, 2). Each pass scans the VM page list for 276 * free or cached pages. After each pass if the entire scan failed 277 * we attempt to flush inactive pages and reset the start index back 278 * to 0. For passes 1 and 2 we also attempt to flush active pages. 279 */ 280 start = 0; 281 for (pass = 0; pass < 3; pass++) { 282 /* 283 * Find first page in array that is free, within range, 284 * aligned, and such that the boundary won't be crossed. 285 */ 286 again: 287 for (i = start; i < vmstats.v_page_count; i++) { 288 m = &pga[i]; 289 phys = VM_PAGE_TO_PHYS(m); 290 pqtype = m->queue - m->pc; 291 if (((pqtype == PQ_FREE) || (pqtype == PQ_CACHE)) && 292 (phys >= low) && (phys < high) && 293 ((phys & (alignment - 1)) == 0) && 294 (((phys ^ (phys + size - 1)) & ~(boundary - 1)) == 0) && 295 m->busy == 0 && m->wire_count == 0 && 296 m->hold_count == 0 && (m->flags & PG_BUSY) == 0 297 298 ) { 299 break; 300 } 301 } 302 303 /* 304 * If we cannot find the page in the given range, or we have 305 * crossed the boundary, call the vm_contig_pg_clean() function 306 * for flushing out the queues, and returning it back to 307 * normal state. 308 */ 309 if ((i == vmstats.v_page_count) || 310 ((VM_PAGE_TO_PHYS(&pga[i]) + size) > high)) { 311 312 /* 313 * Best effort flush of all inactive pages. 314 * This is quite quick, for now stall all 315 * callers, even if they've specified M_NOWAIT. 316 */ 317 for (q = 0; q < PQ_L2_SIZE; ++q) { 318 vm_contig_pg_clean(PQ_INACTIVE + q, 319 vmstats.v_inactive_count); 320 lwkt_yield(); 321 } 322 323 /* 324 * Best effort flush of active pages. 325 * 326 * This is very, very slow. 327 * Only do this if the caller has agreed to M_WAITOK. 328 * 329 * If enough pages are flushed, we may succeed on 330 * next (final) pass, if not the caller, contigmalloc(), 331 * will fail in the index < 0 case. 332 */ 333 if (pass > 0 && (mflags & M_WAITOK)) { 334 for (q = 0; q < PQ_L2_SIZE; ++q) { 335 vm_contig_pg_clean(PQ_ACTIVE + q, 336 vmstats.v_active_count); 337 } 338 lwkt_yield(); 339 } 340 341 /* 342 * We're already too high in the address space 343 * to succeed, reset to 0 for the next iteration. 344 */ 345 start = 0; 346 continue; /* next pass */ 347 } 348 start = i; 349 350 /* 351 * Check successive pages for contiguous and free. 352 * 353 * (still in critical section) 354 */ 355 for (i = start + 1; i < (start + size / PAGE_SIZE); i++) { 356 m = &pga[i]; 357 pqtype = m->queue - m->pc; 358 if ((VM_PAGE_TO_PHYS(&m[0]) != 359 (VM_PAGE_TO_PHYS(&m[-1]) + PAGE_SIZE)) || 360 ((pqtype != PQ_FREE) && (pqtype != PQ_CACHE)) || 361 m->busy || m->wire_count || 362 m->hold_count || (m->flags & PG_BUSY) 363 ) { 364 start++; 365 goto again; 366 } 367 } 368 369 /* 370 * Try to allocate the pages, wiring them as we go. 371 * 372 * (still in critical section) 373 */ 374 for (i = start; i < (start + size / PAGE_SIZE); i++) { 375 m = &pga[i]; 376 377 if (vm_page_busy_try(m, TRUE)) { 378 vm_contig_pg_free(start, 379 (i - start) * PAGE_SIZE); 380 start++; 381 goto again; 382 } 383 pqtype = m->queue - m->pc; 384 if (pqtype == PQ_CACHE && 385 m->hold_count == 0 && 386 m->wire_count == 0 && 387 (m->flags & PG_UNMANAGED) == 0) { 388 vm_page_protect(m, VM_PROT_NONE); 389 KKASSERT((m->flags & PG_MAPPED) == 0); 390 KKASSERT(m->dirty == 0); 391 vm_page_free(m); 392 --i; 393 continue; /* retry the page */ 394 } 395 if (pqtype != PQ_FREE || m->hold_count) { 396 vm_page_wakeup(m); 397 vm_contig_pg_free(start, 398 (i - start) * PAGE_SIZE); 399 start++; 400 goto again; 401 } 402 KKASSERT((m->valid & m->dirty) == 0); 403 KKASSERT(m->wire_count == 0); 404 KKASSERT(m->object == NULL); 405 vm_page_unqueue_nowakeup(m); 406 m->valid = VM_PAGE_BITS_ALL; 407 if (m->flags & PG_ZERO) 408 vm_page_zero_count--; 409 KASSERT(m->dirty == 0, 410 ("vm_contig_pg_alloc: page %p was dirty", m)); 411 KKASSERT(m->wire_count == 0); 412 KKASSERT(m->busy == 0); 413 414 /* 415 * Clear all flags except PG_BUSY, PG_ZERO, and 416 * PG_WANTED, then unbusy the now allocated page. 417 */ 418 vm_page_flag_clear(m, ~(PG_BUSY | PG_SBUSY | 419 PG_ZERO | PG_WANTED)); 420 vm_page_wire(m); 421 vm_page_wakeup(m); 422 } 423 424 /* 425 * Our job is done, return the index page of vm_page_array. 426 */ 427 return (start); /* aka &pga[start] */ 428 } 429 430 /* 431 * Failed. 432 */ 433 return (-1); 434 } 435 436 /* 437 * vm_contig_pg_free: 438 * 439 * Remove pages previously allocated by vm_contig_pg_alloc, and 440 * assume all references to the pages have been removed, and that 441 * it is OK to add them back to the free list. 442 * 443 * Caller must ensure no races on the page range in question. 444 * No other requirements. 445 */ 446 static void 447 vm_contig_pg_free(int start, u_long size) 448 { 449 vm_page_t pga = vm_page_array; 450 451 size = round_page(size); 452 if (size == 0) 453 panic("vm_contig_pg_free: size must not be 0"); 454 455 /* 456 * The pages are wired, vm_page_free_contig() determines whether they 457 * belong to the contig space or not and either frees them to that 458 * space (leaving them wired), or unwires the page and frees it to the 459 * normal PQ_FREE queue. 460 */ 461 vm_page_free_contig(&pga[start], size); 462 } 463 464 /* 465 * vm_contig_pg_kmap: 466 * 467 * Map previously allocated (vm_contig_pg_alloc) range of pages from 468 * vm_page_array[] into the KVA. Once mapped, the pages are part of 469 * the Kernel, and are to free'ed with kmem_free(&kernel_map, addr, size). 470 * 471 * No requirements. 472 */ 473 static vm_offset_t 474 vm_contig_pg_kmap(int start, u_long size, vm_map_t map, int flags) 475 { 476 vm_offset_t addr; 477 vm_paddr_t pa; 478 vm_page_t pga = vm_page_array; 479 u_long offset; 480 481 if (size == 0) 482 panic("vm_contig_pg_kmap: size must not be 0"); 483 size = round_page(size); 484 addr = kmem_alloc_pageable(&kernel_map, size); 485 if (addr) { 486 pa = VM_PAGE_TO_PHYS(&pga[start]); 487 for (offset = 0; offset < size; offset += PAGE_SIZE) 488 pmap_kenter_quick(addr + offset, pa + offset); 489 smp_invltlb(); 490 if (flags & M_ZERO) 491 bzero((void *)addr, size); 492 } 493 return(addr); 494 } 495 496 /* 497 * No requirements. 498 */ 499 void * 500 contigmalloc( 501 unsigned long size, /* should be size_t here and for malloc() */ 502 struct malloc_type *type, 503 int flags, 504 vm_paddr_t low, 505 vm_paddr_t high, 506 unsigned long alignment, 507 unsigned long boundary) 508 { 509 return contigmalloc_map(size, type, flags, low, high, alignment, 510 boundary, &kernel_map); 511 } 512 513 /* 514 * No requirements. 515 */ 516 void * 517 contigmalloc_map(unsigned long size, struct malloc_type *type, 518 int flags, vm_paddr_t low, vm_paddr_t high, 519 unsigned long alignment, unsigned long boundary, 520 vm_map_t map) 521 { 522 int index; 523 void *rv; 524 525 index = vm_contig_pg_alloc(size, low, high, alignment, boundary, flags); 526 if (index < 0) { 527 kprintf("contigmalloc_map: failed size %lu low=%llx " 528 "high=%llx align=%lu boundary=%lu flags=%08x\n", 529 size, (long long)low, (long long)high, 530 alignment, boundary, flags); 531 return NULL; 532 } 533 534 rv = (void *)vm_contig_pg_kmap(index, size, map, flags); 535 if (rv == NULL) 536 vm_contig_pg_free(index, size); 537 538 return rv; 539 } 540 541 /* 542 * No requirements. 543 */ 544 void 545 contigfree(void *addr, unsigned long size, struct malloc_type *type) 546 { 547 vm_paddr_t pa; 548 vm_page_t m; 549 550 if (size == 0) 551 panic("vm_contig_pg_kmap: size must not be 0"); 552 size = round_page(size); 553 554 pa = pmap_extract(&kernel_pmap, (vm_offset_t)addr); 555 pmap_qremove((vm_offset_t)addr, size / PAGE_SIZE); 556 kmem_free(&kernel_map, (vm_offset_t)addr, size); 557 558 m = PHYS_TO_VM_PAGE(pa); 559 vm_page_free_contig(m, size); 560 } 561 562 /* 563 * No requirements. 564 */ 565 vm_offset_t 566 kmem_alloc_contig(vm_offset_t size, vm_paddr_t low, vm_paddr_t high, 567 vm_offset_t alignment) 568 { 569 return ((vm_offset_t)contigmalloc_map(size, M_DEVBUF, M_NOWAIT, low, 570 high, alignment, 0ul, &kernel_map)); 571 } 572