1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 26 /* All Rights Reserved */ 27 28 /* 29 * Portions of this source code were derived from Berkeley 4.3 BSD 30 * under license from the Regents of the University of California. 31 */ 32 33 /* 34 * segkp is a segment driver that administers the allocation and deallocation 35 * of pageable variable size chunks of kernel virtual address space. Each 36 * allocated resource is page-aligned. 37 * 38 * The user may specify whether the resource should be initialized to 0, 39 * include a redzone, or locked in memory. 40 */ 41 42 #include <sys/types.h> 43 #include <sys/t_lock.h> 44 #include <sys/thread.h> 45 #include <sys/param.h> 46 #include <sys/errno.h> 47 #include <sys/sysmacros.h> 48 #include <sys/systm.h> 49 #include <sys/buf.h> 50 #include <sys/mman.h> 51 #include <sys/vnode.h> 52 #include <sys/cmn_err.h> 53 #include <sys/swap.h> 54 #include <sys/tuneable.h> 55 #include <sys/kmem.h> 56 #include <sys/vmem.h> 57 #include <sys/cred.h> 58 #include <sys/dumphdr.h> 59 #include <sys/debug.h> 60 #include <sys/vtrace.h> 61 #include <sys/stack.h> 62 #include <sys/atomic.h> 63 #include <sys/archsystm.h> 64 #include <sys/lgrp.h> 65 66 #include <vm/as.h> 67 #include <vm/seg.h> 68 #include <vm/seg_kp.h> 69 #include <vm/seg_kmem.h> 70 #include <vm/anon.h> 71 #include <vm/page.h> 72 #include <vm/hat.h> 73 #include <sys/bitmap.h> 74 75 /* 76 * Private seg op routines 77 */ 78 static void segkp_badop(void); 79 static void segkp_dump(struct seg *seg); 80 static int segkp_checkprot(struct seg *seg, caddr_t addr, size_t len, 81 uint_t prot); 82 static int segkp_kluster(struct seg *seg, caddr_t addr, ssize_t delta); 83 static int segkp_pagelock(struct seg *seg, caddr_t addr, size_t len, 84 struct page ***page, enum lock_type type, 85 enum seg_rw rw); 86 static void segkp_insert(struct seg *seg, struct segkp_data *kpd); 87 static void segkp_delete(struct seg *seg, struct segkp_data *kpd); 88 static caddr_t segkp_get_internal(struct seg *seg, size_t len, uint_t flags, 89 struct segkp_data **tkpd, struct anon_map *amp); 90 static void segkp_release_internal(struct seg *seg, 91 struct segkp_data *kpd, size_t len); 92 static int segkp_unlock(struct hat *hat, struct seg *seg, caddr_t vaddr, 93 size_t len, struct segkp_data *kpd, uint_t flags); 94 static int segkp_load(struct hat *hat, struct seg *seg, caddr_t vaddr, 95 size_t len, struct segkp_data *kpd, uint_t flags); 96 static struct segkp_data *segkp_find(struct seg *seg, caddr_t vaddr); 97 static int segkp_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp); 98 static lgrp_mem_policy_info_t *segkp_getpolicy(struct seg *seg, 99 caddr_t addr); 100 static int segkp_capable(struct seg *seg, segcapability_t capability); 101 102 /* 103 * Lock used to protect the hash table(s) and caches. 104 */ 105 static kmutex_t segkp_lock; 106 107 /* 108 * The segkp caches 109 */ 110 static struct segkp_cache segkp_cache[SEGKP_MAX_CACHE]; 111 112 #define SEGKP_BADOP(t) (t(*)())segkp_badop 113 114 /* 115 * When there are fewer than red_minavail bytes left on the stack, 116 * segkp_map_red() will map in the redzone (if called). 5000 seems 117 * to work reasonably well... 118 */ 119 long red_minavail = 5000; 120 121 /* 122 * will be set to 1 for 32 bit x86 systems only, in startup.c 123 */ 124 int segkp_fromheap = 0; 125 ulong_t *segkp_bitmap; 126 127 /* 128 * If segkp_map_red() is called with the redzone already mapped and 129 * with less than RED_DEEP_THRESHOLD bytes available on the stack, 130 * then the stack situation has become quite serious; if much more stack 131 * is consumed, we have the potential of scrogging the next thread/LWP 132 * structure. To help debug the "can't happen" panics which may 133 * result from this condition, we record hrestime and the calling thread 134 * in red_deep_hires and red_deep_thread respectively. 135 */ 136 #define RED_DEEP_THRESHOLD 2000 137 138 hrtime_t red_deep_hires; 139 kthread_t *red_deep_thread; 140 141 uint32_t red_nmapped; 142 uint32_t red_closest = UINT_MAX; 143 uint32_t red_ndoubles; 144 145 pgcnt_t anon_segkp_pages_locked; /* See vm/anon.h */ 146 pgcnt_t anon_segkp_pages_resv; /* anon reserved by seg_kp */ 147 148 static struct seg_ops segkp_ops = { 149 SEGKP_BADOP(int), /* dup */ 150 SEGKP_BADOP(int), /* unmap */ 151 SEGKP_BADOP(void), /* free */ 152 segkp_fault, 153 SEGKP_BADOP(faultcode_t), /* faulta */ 154 SEGKP_BADOP(int), /* setprot */ 155 segkp_checkprot, 156 segkp_kluster, 157 SEGKP_BADOP(int), /* sync */ 158 SEGKP_BADOP(size_t), /* incore */ 159 SEGKP_BADOP(int), /* lockop */ 160 SEGKP_BADOP(int), /* getprot */ 161 SEGKP_BADOP(u_offset_t), /* getoffset */ 162 SEGKP_BADOP(int), /* gettype */ 163 SEGKP_BADOP(int), /* getvp */ 164 SEGKP_BADOP(int), /* advise */ 165 segkp_dump, /* dump */ 166 segkp_pagelock, /* pagelock */ 167 SEGKP_BADOP(int), /* setpgsz */ 168 segkp_getmemid, /* getmemid */ 169 segkp_getpolicy, /* getpolicy */ 170 segkp_capable, /* capable */ 171 seg_inherit_notsup /* inherit */ 172 }; 173 174 175 static void 176 segkp_badop(void) 177 { 178 panic("segkp_badop"); 179 /*NOTREACHED*/ 180 } 181 182 static void segkpinit_mem_config(struct seg *); 183 184 static uint32_t segkp_indel; 185 186 /* 187 * Allocate the segment specific private data struct and fill it in 188 * with the per kp segment mutex, anon ptr. array and hash table. 189 */ 190 int 191 segkp_create(struct seg *seg) 192 { 193 struct segkp_segdata *kpsd; 194 size_t np; 195 196 ASSERT(seg != NULL && seg->s_as == &kas); 197 ASSERT(RW_WRITE_HELD(&seg->s_as->a_lock)); 198 199 if (seg->s_size & PAGEOFFSET) { 200 panic("Bad segkp size"); 201 /*NOTREACHED*/ 202 } 203 204 kpsd = kmem_zalloc(sizeof (struct segkp_segdata), KM_SLEEP); 205 206 /* 207 * Allocate the virtual memory for segkp and initialize it 208 */ 209 if (segkp_fromheap) { 210 np = btop(kvseg.s_size); 211 segkp_bitmap = kmem_zalloc(BT_SIZEOFMAP(np), KM_SLEEP); 212 kpsd->kpsd_arena = vmem_create("segkp", NULL, 0, PAGESIZE, 213 vmem_alloc, vmem_free, heap_arena, 5 * PAGESIZE, VM_SLEEP); 214 } else { 215 segkp_bitmap = NULL; 216 np = btop(seg->s_size); 217 kpsd->kpsd_arena = vmem_create("segkp", seg->s_base, 218 seg->s_size, PAGESIZE, NULL, NULL, NULL, 5 * PAGESIZE, 219 VM_SLEEP); 220 } 221 222 kpsd->kpsd_anon = anon_create(np, ANON_SLEEP | ANON_ALLOC_FORCE); 223 224 kpsd->kpsd_hash = kmem_zalloc(SEGKP_HASHSZ * sizeof (struct segkp *), 225 KM_SLEEP); 226 seg->s_data = (void *)kpsd; 227 seg->s_ops = &segkp_ops; 228 segkpinit_mem_config(seg); 229 return (0); 230 } 231 232 233 /* 234 * Find a free 'freelist' and initialize it with the appropriate attributes 235 */ 236 void * 237 segkp_cache_init(struct seg *seg, int maxsize, size_t len, uint_t flags) 238 { 239 int i; 240 241 if ((flags & KPD_NO_ANON) && !(flags & KPD_LOCKED)) 242 return ((void *)-1); 243 244 mutex_enter(&segkp_lock); 245 for (i = 0; i < SEGKP_MAX_CACHE; i++) { 246 if (segkp_cache[i].kpf_inuse) 247 continue; 248 segkp_cache[i].kpf_inuse = 1; 249 segkp_cache[i].kpf_max = maxsize; 250 segkp_cache[i].kpf_flags = flags; 251 segkp_cache[i].kpf_seg = seg; 252 segkp_cache[i].kpf_len = len; 253 mutex_exit(&segkp_lock); 254 return ((void *)(uintptr_t)i); 255 } 256 mutex_exit(&segkp_lock); 257 return ((void *)-1); 258 } 259 260 /* 261 * Free all the cache resources. 262 */ 263 void 264 segkp_cache_free(void) 265 { 266 struct segkp_data *kpd; 267 struct seg *seg; 268 int i; 269 270 mutex_enter(&segkp_lock); 271 for (i = 0; i < SEGKP_MAX_CACHE; i++) { 272 if (!segkp_cache[i].kpf_inuse) 273 continue; 274 /* 275 * Disconnect the freelist and process each element 276 */ 277 kpd = segkp_cache[i].kpf_list; 278 seg = segkp_cache[i].kpf_seg; 279 segkp_cache[i].kpf_list = NULL; 280 segkp_cache[i].kpf_count = 0; 281 mutex_exit(&segkp_lock); 282 283 while (kpd != NULL) { 284 struct segkp_data *next; 285 286 next = kpd->kp_next; 287 segkp_release_internal(seg, kpd, kpd->kp_len); 288 kpd = next; 289 } 290 mutex_enter(&segkp_lock); 291 } 292 mutex_exit(&segkp_lock); 293 } 294 295 /* 296 * There are 2 entries into segkp_get_internal. The first includes a cookie 297 * used to access a pool of cached segkp resources. The second does not 298 * use the cache. 299 */ 300 caddr_t 301 segkp_get(struct seg *seg, size_t len, uint_t flags) 302 { 303 struct segkp_data *kpd = NULL; 304 305 if (segkp_get_internal(seg, len, flags, &kpd, NULL) != NULL) { 306 kpd->kp_cookie = -1; 307 return (stom(kpd->kp_base, flags)); 308 } 309 return (NULL); 310 } 311 312 /* 313 * Return a 'cached' segkp address 314 */ 315 caddr_t 316 segkp_cache_get(void *cookie) 317 { 318 struct segkp_cache *freelist = NULL; 319 struct segkp_data *kpd = NULL; 320 int index = (int)(uintptr_t)cookie; 321 struct seg *seg; 322 size_t len; 323 uint_t flags; 324 325 if (index < 0 || index >= SEGKP_MAX_CACHE) 326 return (NULL); 327 freelist = &segkp_cache[index]; 328 329 mutex_enter(&segkp_lock); 330 seg = freelist->kpf_seg; 331 flags = freelist->kpf_flags; 332 if (freelist->kpf_list != NULL) { 333 kpd = freelist->kpf_list; 334 freelist->kpf_list = kpd->kp_next; 335 freelist->kpf_count--; 336 mutex_exit(&segkp_lock); 337 kpd->kp_next = NULL; 338 segkp_insert(seg, kpd); 339 return (stom(kpd->kp_base, flags)); 340 } 341 len = freelist->kpf_len; 342 mutex_exit(&segkp_lock); 343 if (segkp_get_internal(seg, len, flags, &kpd, NULL) != NULL) { 344 kpd->kp_cookie = index; 345 return (stom(kpd->kp_base, flags)); 346 } 347 return (NULL); 348 } 349 350 caddr_t 351 segkp_get_withanonmap( 352 struct seg *seg, 353 size_t len, 354 uint_t flags, 355 struct anon_map *amp) 356 { 357 struct segkp_data *kpd = NULL; 358 359 ASSERT(amp != NULL); 360 flags |= KPD_HASAMP; 361 if (segkp_get_internal(seg, len, flags, &kpd, amp) != NULL) { 362 kpd->kp_cookie = -1; 363 return (stom(kpd->kp_base, flags)); 364 } 365 return (NULL); 366 } 367 368 /* 369 * This does the real work of segkp allocation. 370 * Return to client base addr. len must be page-aligned. A null value is 371 * returned if there are no more vm resources (e.g. pages, swap). The len 372 * and base recorded in the private data structure include the redzone 373 * and the redzone length (if applicable). If the user requests a redzone 374 * either the first or last page is left unmapped depending whether stacks 375 * grow to low or high memory. 376 * 377 * The client may also specify a no-wait flag. If that is set then the 378 * request will choose a non-blocking path when requesting resources. 379 * The default is make the client wait. 380 */ 381 static caddr_t 382 segkp_get_internal( 383 struct seg *seg, 384 size_t len, 385 uint_t flags, 386 struct segkp_data **tkpd, 387 struct anon_map *amp) 388 { 389 struct segkp_segdata *kpsd = (struct segkp_segdata *)seg->s_data; 390 struct segkp_data *kpd; 391 caddr_t vbase = NULL; /* always first virtual, may not be mapped */ 392 pgcnt_t np = 0; /* number of pages in the resource */ 393 pgcnt_t segkpindex; 394 long i; 395 caddr_t va; 396 pgcnt_t pages = 0; 397 ulong_t anon_idx = 0; 398 int kmflag = (flags & KPD_NOWAIT) ? KM_NOSLEEP : KM_SLEEP; 399 caddr_t s_base = (segkp_fromheap) ? kvseg.s_base : seg->s_base; 400 401 if (len & PAGEOFFSET) { 402 panic("segkp_get: len is not page-aligned"); 403 /*NOTREACHED*/ 404 } 405 406 ASSERT(((flags & KPD_HASAMP) == 0) == (amp == NULL)); 407 408 /* Only allow KPD_NO_ANON if we are going to lock it down */ 409 if ((flags & (KPD_LOCKED|KPD_NO_ANON)) == KPD_NO_ANON) 410 return (NULL); 411 412 if ((kpd = kmem_zalloc(sizeof (struct segkp_data), kmflag)) == NULL) 413 return (NULL); 414 /* 415 * Fix up the len to reflect the REDZONE if applicable 416 */ 417 if (flags & KPD_HASREDZONE) 418 len += PAGESIZE; 419 np = btop(len); 420 421 vbase = vmem_alloc(SEGKP_VMEM(seg), len, kmflag | VM_BESTFIT); 422 if (vbase == NULL) { 423 kmem_free(kpd, sizeof (struct segkp_data)); 424 return (NULL); 425 } 426 427 /* If locking, reserve physical memory */ 428 if (flags & KPD_LOCKED) { 429 pages = btop(SEGKP_MAPLEN(len, flags)); 430 if (page_resv(pages, kmflag) == 0) { 431 vmem_free(SEGKP_VMEM(seg), vbase, len); 432 kmem_free(kpd, sizeof (struct segkp_data)); 433 return (NULL); 434 } 435 if ((flags & KPD_NO_ANON) == 0) 436 atomic_add_long(&anon_segkp_pages_locked, pages); 437 } 438 439 /* 440 * Reserve sufficient swap space for this vm resource. We'll 441 * actually allocate it in the loop below, but reserving it 442 * here allows us to back out more gracefully than if we 443 * had an allocation failure in the body of the loop. 444 * 445 * Note that we don't need swap space for the red zone page. 446 */ 447 if (amp != NULL) { 448 /* 449 * The swap reservation has been done, if required, and the 450 * anon_hdr is separate. 451 */ 452 anon_idx = 0; 453 kpd->kp_anon_idx = anon_idx; 454 kpd->kp_anon = amp->ahp; 455 456 TRACE_5(TR_FAC_VM, TR_ANON_SEGKP, "anon segkp:%p %p %lu %u %u", 457 kpd, vbase, len, flags, 1); 458 459 } else if ((flags & KPD_NO_ANON) == 0) { 460 if (anon_resv_zone(SEGKP_MAPLEN(len, flags), NULL) == 0) { 461 if (flags & KPD_LOCKED) { 462 atomic_add_long(&anon_segkp_pages_locked, 463 -pages); 464 page_unresv(pages); 465 } 466 vmem_free(SEGKP_VMEM(seg), vbase, len); 467 kmem_free(kpd, sizeof (struct segkp_data)); 468 return (NULL); 469 } 470 atomic_add_long(&anon_segkp_pages_resv, 471 btop(SEGKP_MAPLEN(len, flags))); 472 anon_idx = ((uintptr_t)(vbase - s_base)) >> PAGESHIFT; 473 kpd->kp_anon_idx = anon_idx; 474 kpd->kp_anon = kpsd->kpsd_anon; 475 476 TRACE_5(TR_FAC_VM, TR_ANON_SEGKP, "anon segkp:%p %p %lu %u %u", 477 kpd, vbase, len, flags, 1); 478 } else { 479 kpd->kp_anon = NULL; 480 kpd->kp_anon_idx = 0; 481 } 482 483 /* 484 * Allocate page and anon resources for the virtual address range 485 * except the redzone 486 */ 487 if (segkp_fromheap) 488 segkpindex = btop((uintptr_t)(vbase - kvseg.s_base)); 489 for (i = 0, va = vbase; i < np; i++, va += PAGESIZE) { 490 page_t *pl[2]; 491 struct vnode *vp; 492 anoff_t off; 493 int err; 494 page_t *pp = NULL; 495 496 /* 497 * Mark this page to be a segkp page in the bitmap. 498 */ 499 if (segkp_fromheap) { 500 BT_ATOMIC_SET(segkp_bitmap, segkpindex); 501 segkpindex++; 502 } 503 504 /* 505 * If this page is the red zone page, we don't need swap 506 * space for it. Note that we skip over the code that 507 * establishes MMU mappings, so that the page remains 508 * invalid. 509 */ 510 if ((flags & KPD_HASREDZONE) && KPD_REDZONE(kpd) == i) 511 continue; 512 513 if (kpd->kp_anon != NULL) { 514 struct anon *ap; 515 516 ASSERT(anon_get_ptr(kpd->kp_anon, anon_idx + i) 517 == NULL); 518 /* 519 * Determine the "vp" and "off" of the anon slot. 520 */ 521 ap = anon_alloc(NULL, 0); 522 if (amp != NULL) 523 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); 524 (void) anon_set_ptr(kpd->kp_anon, anon_idx + i, 525 ap, ANON_SLEEP); 526 if (amp != NULL) 527 ANON_LOCK_EXIT(&->a_rwlock); 528 swap_xlate(ap, &vp, &off); 529 530 /* 531 * Create a page with the specified identity. The 532 * page is returned with the "shared" lock held. 533 */ 534 err = VOP_GETPAGE(vp, (offset_t)off, PAGESIZE, 535 NULL, pl, PAGESIZE, seg, va, S_CREATE, 536 kcred, NULL); 537 if (err) { 538 /* 539 * XXX - This should not fail. 540 */ 541 panic("segkp_get: no pages"); 542 /*NOTREACHED*/ 543 } 544 pp = pl[0]; 545 } else { 546 ASSERT(page_exists(&kvp, 547 (u_offset_t)(uintptr_t)va) == NULL); 548 549 if ((pp = page_create_va(&kvp, 550 (u_offset_t)(uintptr_t)va, PAGESIZE, 551 (flags & KPD_NOWAIT ? 0 : PG_WAIT) | PG_EXCL | 552 PG_NORELOC, seg, va)) == NULL) { 553 /* 554 * Legitimize resource; then destroy it. 555 * Easier than trying to unwind here. 556 */ 557 kpd->kp_flags = flags; 558 kpd->kp_base = vbase; 559 kpd->kp_len = len; 560 segkp_release_internal(seg, kpd, va - vbase); 561 return (NULL); 562 } 563 page_io_unlock(pp); 564 } 565 566 if (flags & KPD_ZERO) 567 pagezero(pp, 0, PAGESIZE); 568 569 /* 570 * Load and lock an MMU translation for the page. 571 */ 572 hat_memload(seg->s_as->a_hat, va, pp, (PROT_READ|PROT_WRITE), 573 ((flags & KPD_LOCKED) ? HAT_LOAD_LOCK : HAT_LOAD)); 574 575 /* 576 * Now, release lock on the page. 577 */ 578 if (flags & KPD_LOCKED) { 579 /* 580 * Indicate to page_retire framework that this 581 * page can only be retired when it is freed. 582 */ 583 PP_SETRAF(pp); 584 page_downgrade(pp); 585 } else 586 page_unlock(pp); 587 } 588 589 kpd->kp_flags = flags; 590 kpd->kp_base = vbase; 591 kpd->kp_len = len; 592 segkp_insert(seg, kpd); 593 *tkpd = kpd; 594 return (stom(kpd->kp_base, flags)); 595 } 596 597 /* 598 * Release the resource to cache if the pool(designate by the cookie) 599 * has less than the maximum allowable. If inserted in cache, 600 * segkp_delete insures element is taken off of active list. 601 */ 602 void 603 segkp_release(struct seg *seg, caddr_t vaddr) 604 { 605 struct segkp_cache *freelist; 606 struct segkp_data *kpd = NULL; 607 608 if ((kpd = segkp_find(seg, vaddr)) == NULL) { 609 panic("segkp_release: null kpd"); 610 /*NOTREACHED*/ 611 } 612 613 if (kpd->kp_cookie != -1) { 614 freelist = &segkp_cache[kpd->kp_cookie]; 615 mutex_enter(&segkp_lock); 616 if (!segkp_indel && freelist->kpf_count < freelist->kpf_max) { 617 segkp_delete(seg, kpd); 618 kpd->kp_next = freelist->kpf_list; 619 freelist->kpf_list = kpd; 620 freelist->kpf_count++; 621 mutex_exit(&segkp_lock); 622 return; 623 } else { 624 mutex_exit(&segkp_lock); 625 kpd->kp_cookie = -1; 626 } 627 } 628 segkp_release_internal(seg, kpd, kpd->kp_len); 629 } 630 631 /* 632 * Free the entire resource. segkp_unlock gets called with the start of the 633 * mapped portion of the resource. The length is the size of the mapped 634 * portion 635 */ 636 static void 637 segkp_release_internal(struct seg *seg, struct segkp_data *kpd, size_t len) 638 { 639 caddr_t va; 640 long i; 641 long redzone; 642 size_t np; 643 page_t *pp; 644 struct vnode *vp; 645 anoff_t off; 646 struct anon *ap; 647 pgcnt_t segkpindex; 648 649 ASSERT(kpd != NULL); 650 ASSERT((kpd->kp_flags & KPD_HASAMP) == 0 || kpd->kp_cookie == -1); 651 np = btop(len); 652 653 /* Remove from active hash list */ 654 if (kpd->kp_cookie == -1) { 655 mutex_enter(&segkp_lock); 656 segkp_delete(seg, kpd); 657 mutex_exit(&segkp_lock); 658 } 659 660 /* 661 * Precompute redzone page index. 662 */ 663 redzone = -1; 664 if (kpd->kp_flags & KPD_HASREDZONE) 665 redzone = KPD_REDZONE(kpd); 666 667 668 va = kpd->kp_base; 669 670 hat_unload(seg->s_as->a_hat, va, (np << PAGESHIFT), 671 ((kpd->kp_flags & KPD_LOCKED) ? HAT_UNLOAD_UNLOCK : HAT_UNLOAD)); 672 /* 673 * Free up those anon resources that are quiescent. 674 */ 675 if (segkp_fromheap) 676 segkpindex = btop((uintptr_t)(va - kvseg.s_base)); 677 for (i = 0; i < np; i++, va += PAGESIZE) { 678 679 /* 680 * Clear the bit for this page from the bitmap. 681 */ 682 if (segkp_fromheap) { 683 BT_ATOMIC_CLEAR(segkp_bitmap, segkpindex); 684 segkpindex++; 685 } 686 687 if (i == redzone) 688 continue; 689 if (kpd->kp_anon) { 690 /* 691 * Free up anon resources and destroy the 692 * associated pages. 693 * 694 * Release the lock if there is one. Have to get the 695 * page to do this, unfortunately. 696 */ 697 if (kpd->kp_flags & KPD_LOCKED) { 698 ap = anon_get_ptr(kpd->kp_anon, 699 kpd->kp_anon_idx + i); 700 swap_xlate(ap, &vp, &off); 701 /* Find the shared-locked page. */ 702 pp = page_find(vp, (u_offset_t)off); 703 if (pp == NULL) { 704 panic("segkp_release: " 705 "kp_anon: no page to unlock "); 706 /*NOTREACHED*/ 707 } 708 if (PP_ISRAF(pp)) 709 PP_CLRRAF(pp); 710 711 page_unlock(pp); 712 } 713 if ((kpd->kp_flags & KPD_HASAMP) == 0) { 714 anon_free(kpd->kp_anon, kpd->kp_anon_idx + i, 715 PAGESIZE); 716 anon_unresv_zone(PAGESIZE, NULL); 717 atomic_dec_ulong(&anon_segkp_pages_resv); 718 } 719 TRACE_5(TR_FAC_VM, 720 TR_ANON_SEGKP, "anon segkp:%p %p %lu %u %u", 721 kpd, va, PAGESIZE, 0, 0); 722 } else { 723 if (kpd->kp_flags & KPD_LOCKED) { 724 pp = page_find(&kvp, (u_offset_t)(uintptr_t)va); 725 if (pp == NULL) { 726 panic("segkp_release: " 727 "no page to unlock"); 728 /*NOTREACHED*/ 729 } 730 if (PP_ISRAF(pp)) 731 PP_CLRRAF(pp); 732 /* 733 * We should just upgrade the lock here 734 * but there is no upgrade that waits. 735 */ 736 page_unlock(pp); 737 } 738 pp = page_lookup(&kvp, (u_offset_t)(uintptr_t)va, 739 SE_EXCL); 740 if (pp != NULL) 741 page_destroy(pp, 0); 742 } 743 } 744 745 /* If locked, release physical memory reservation */ 746 if (kpd->kp_flags & KPD_LOCKED) { 747 pgcnt_t pages = btop(SEGKP_MAPLEN(kpd->kp_len, kpd->kp_flags)); 748 if ((kpd->kp_flags & KPD_NO_ANON) == 0) 749 atomic_add_long(&anon_segkp_pages_locked, -pages); 750 page_unresv(pages); 751 } 752 753 vmem_free(SEGKP_VMEM(seg), kpd->kp_base, kpd->kp_len); 754 kmem_free(kpd, sizeof (struct segkp_data)); 755 } 756 757 /* 758 * segkp_map_red() will check the current frame pointer against the 759 * stack base. If the amount of stack remaining is questionable 760 * (less than red_minavail), then segkp_map_red() will map in the redzone 761 * and return 1. Otherwise, it will return 0. segkp_map_red() can 762 * _only_ be called when it is safe to sleep on page_create_va(). 763 * 764 * It is up to the caller to remember whether segkp_map_red() successfully 765 * mapped the redzone, and, if so, to call segkp_unmap_red() at a later 766 * time. 767 * 768 * Currently, this routine is only called from pagefault() (which necessarily 769 * satisfies the above conditions). 770 */ 771 #if defined(STACK_GROWTH_DOWN) 772 int 773 segkp_map_red(void) 774 { 775 uintptr_t fp = STACK_BIAS + (uintptr_t)getfp(); 776 #ifndef _LP64 777 caddr_t stkbase; 778 #endif 779 780 /* 781 * Optimize for the common case where we simply return. 782 */ 783 if ((curthread->t_red_pp == NULL) && 784 (fp - (uintptr_t)curthread->t_stkbase >= red_minavail)) 785 return (0); 786 787 #if defined(_LP64) 788 /* 789 * XXX We probably need something better than this. 790 */ 791 panic("kernel stack overflow"); 792 /*NOTREACHED*/ 793 #else /* _LP64 */ 794 if (curthread->t_red_pp == NULL) { 795 page_t *red_pp; 796 struct seg kseg; 797 798 caddr_t red_va = (caddr_t) 799 (((uintptr_t)curthread->t_stkbase & (uintptr_t)PAGEMASK) - 800 PAGESIZE); 801 802 ASSERT(page_exists(&kvp, (u_offset_t)(uintptr_t)red_va) == 803 NULL); 804 805 /* 806 * Allocate the physical for the red page. 807 */ 808 /* 809 * No PG_NORELOC here to avoid waits. Unlikely to get 810 * a relocate happening in the short time the page exists 811 * and it will be OK anyway. 812 */ 813 814 kseg.s_as = &kas; 815 red_pp = page_create_va(&kvp, (u_offset_t)(uintptr_t)red_va, 816 PAGESIZE, PG_WAIT | PG_EXCL, &kseg, red_va); 817 ASSERT(red_pp != NULL); 818 819 /* 820 * So we now have a page to jam into the redzone... 821 */ 822 page_io_unlock(red_pp); 823 824 hat_memload(kas.a_hat, red_va, red_pp, 825 (PROT_READ|PROT_WRITE), HAT_LOAD_LOCK); 826 page_downgrade(red_pp); 827 828 /* 829 * The page is left SE_SHARED locked so we can hold on to 830 * the page_t pointer. 831 */ 832 curthread->t_red_pp = red_pp; 833 834 atomic_inc_32(&red_nmapped); 835 while (fp - (uintptr_t)curthread->t_stkbase < red_closest) { 836 (void) atomic_cas_32(&red_closest, red_closest, 837 (uint32_t)(fp - (uintptr_t)curthread->t_stkbase)); 838 } 839 return (1); 840 } 841 842 stkbase = (caddr_t)(((uintptr_t)curthread->t_stkbase & 843 (uintptr_t)PAGEMASK) - PAGESIZE); 844 845 atomic_inc_32(&red_ndoubles); 846 847 if (fp - (uintptr_t)stkbase < RED_DEEP_THRESHOLD) { 848 /* 849 * Oh boy. We're already deep within the mapped-in 850 * redzone page, and the caller is trying to prepare 851 * for a deep stack run. We're running without a 852 * redzone right now: if the caller plows off the 853 * end of the stack, it'll plow another thread or 854 * LWP structure. That situation could result in 855 * a very hard-to-debug panic, so, in the spirit of 856 * recording the name of one's killer in one's own 857 * blood, we're going to record hrestime and the calling 858 * thread. 859 */ 860 red_deep_hires = hrestime.tv_nsec; 861 red_deep_thread = curthread; 862 } 863 864 /* 865 * If this is a DEBUG kernel, and we've run too deep for comfort, toss. 866 */ 867 ASSERT(fp - (uintptr_t)stkbase >= RED_DEEP_THRESHOLD); 868 return (0); 869 #endif /* _LP64 */ 870 } 871 872 void 873 segkp_unmap_red(void) 874 { 875 page_t *pp; 876 caddr_t red_va = (caddr_t)(((uintptr_t)curthread->t_stkbase & 877 (uintptr_t)PAGEMASK) - PAGESIZE); 878 879 ASSERT(curthread->t_red_pp != NULL); 880 881 /* 882 * Because we locked the mapping down, we can't simply rely 883 * on page_destroy() to clean everything up; we need to call 884 * hat_unload() to explicitly unlock the mapping resources. 885 */ 886 hat_unload(kas.a_hat, red_va, PAGESIZE, HAT_UNLOAD_UNLOCK); 887 888 pp = curthread->t_red_pp; 889 890 ASSERT(pp == page_find(&kvp, (u_offset_t)(uintptr_t)red_va)); 891 892 /* 893 * Need to upgrade the SE_SHARED lock to SE_EXCL. 894 */ 895 if (!page_tryupgrade(pp)) { 896 /* 897 * As there is now wait for upgrade, release the 898 * SE_SHARED lock and wait for SE_EXCL. 899 */ 900 page_unlock(pp); 901 pp = page_lookup(&kvp, (u_offset_t)(uintptr_t)red_va, SE_EXCL); 902 /* pp may be NULL here, hence the test below */ 903 } 904 905 /* 906 * Destroy the page, with dontfree set to zero (i.e. free it). 907 */ 908 if (pp != NULL) 909 page_destroy(pp, 0); 910 curthread->t_red_pp = NULL; 911 } 912 #else 913 #error Red stacks only supported with downwards stack growth. 914 #endif 915 916 /* 917 * Handle a fault on an address corresponding to one of the 918 * resources in the segkp segment. 919 */ 920 faultcode_t 921 segkp_fault( 922 struct hat *hat, 923 struct seg *seg, 924 caddr_t vaddr, 925 size_t len, 926 enum fault_type type, 927 enum seg_rw rw) 928 { 929 struct segkp_data *kpd = NULL; 930 int err; 931 932 ASSERT(seg->s_as == &kas && RW_READ_HELD(&seg->s_as->a_lock)); 933 934 /* 935 * Sanity checks. 936 */ 937 if (type == F_PROT) { 938 panic("segkp_fault: unexpected F_PROT fault"); 939 /*NOTREACHED*/ 940 } 941 942 if ((kpd = segkp_find(seg, vaddr)) == NULL) 943 return (FC_NOMAP); 944 945 mutex_enter(&kpd->kp_lock); 946 947 if (type == F_SOFTLOCK) { 948 ASSERT(!(kpd->kp_flags & KPD_LOCKED)); 949 /* 950 * The F_SOFTLOCK case has more stringent 951 * range requirements: the given range must exactly coincide 952 * with the resource's mapped portion. Note reference to 953 * redzone is handled since vaddr would not equal base 954 */ 955 if (vaddr != stom(kpd->kp_base, kpd->kp_flags) || 956 len != SEGKP_MAPLEN(kpd->kp_len, kpd->kp_flags)) { 957 mutex_exit(&kpd->kp_lock); 958 return (FC_MAKE_ERR(EFAULT)); 959 } 960 961 if ((err = segkp_load(hat, seg, vaddr, len, kpd, KPD_LOCKED))) { 962 mutex_exit(&kpd->kp_lock); 963 return (FC_MAKE_ERR(err)); 964 } 965 kpd->kp_flags |= KPD_LOCKED; 966 mutex_exit(&kpd->kp_lock); 967 return (0); 968 } 969 970 if (type == F_INVAL) { 971 ASSERT(!(kpd->kp_flags & KPD_NO_ANON)); 972 973 /* 974 * Check if we touched the redzone. Somewhat optimistic 975 * here if we are touching the redzone of our own stack 976 * since we wouldn't have a stack to get this far... 977 */ 978 if ((kpd->kp_flags & KPD_HASREDZONE) && 979 btop((uintptr_t)(vaddr - kpd->kp_base)) == KPD_REDZONE(kpd)) 980 panic("segkp_fault: accessing redzone"); 981 982 /* 983 * This fault may occur while the page is being F_SOFTLOCK'ed. 984 * Return since a 2nd segkp_load is unnecessary and also would 985 * result in the page being locked twice and eventually 986 * hang the thread_reaper thread. 987 */ 988 if (kpd->kp_flags & KPD_LOCKED) { 989 mutex_exit(&kpd->kp_lock); 990 return (0); 991 } 992 993 err = segkp_load(hat, seg, vaddr, len, kpd, kpd->kp_flags); 994 mutex_exit(&kpd->kp_lock); 995 return (err ? FC_MAKE_ERR(err) : 0); 996 } 997 998 if (type == F_SOFTUNLOCK) { 999 uint_t flags; 1000 1001 /* 1002 * Make sure the addr is LOCKED and it has anon backing 1003 * before unlocking 1004 */ 1005 if ((kpd->kp_flags & (KPD_LOCKED|KPD_NO_ANON)) != KPD_LOCKED) { 1006 panic("segkp_fault: bad unlock"); 1007 /*NOTREACHED*/ 1008 } 1009 1010 if (vaddr != stom(kpd->kp_base, kpd->kp_flags) || 1011 len != SEGKP_MAPLEN(kpd->kp_len, kpd->kp_flags)) { 1012 panic("segkp_fault: bad range"); 1013 /*NOTREACHED*/ 1014 } 1015 1016 if (rw == S_WRITE) 1017 flags = kpd->kp_flags | KPD_WRITEDIRTY; 1018 else 1019 flags = kpd->kp_flags; 1020 err = segkp_unlock(hat, seg, vaddr, len, kpd, flags); 1021 kpd->kp_flags &= ~KPD_LOCKED; 1022 mutex_exit(&kpd->kp_lock); 1023 return (err ? FC_MAKE_ERR(err) : 0); 1024 } 1025 mutex_exit(&kpd->kp_lock); 1026 panic("segkp_fault: bogus fault type: %d\n", type); 1027 /*NOTREACHED*/ 1028 } 1029 1030 /* 1031 * Check that the given protections suffice over the range specified by 1032 * vaddr and len. For this segment type, the only issue is whether or 1033 * not the range lies completely within the mapped part of an allocated 1034 * resource. 1035 */ 1036 /* ARGSUSED */ 1037 static int 1038 segkp_checkprot(struct seg *seg, caddr_t vaddr, size_t len, uint_t prot) 1039 { 1040 struct segkp_data *kpd = NULL; 1041 caddr_t mbase; 1042 size_t mlen; 1043 1044 if ((kpd = segkp_find(seg, vaddr)) == NULL) 1045 return (EACCES); 1046 1047 mutex_enter(&kpd->kp_lock); 1048 mbase = stom(kpd->kp_base, kpd->kp_flags); 1049 mlen = SEGKP_MAPLEN(kpd->kp_len, kpd->kp_flags); 1050 if (len > mlen || vaddr < mbase || 1051 ((vaddr + len) > (mbase + mlen))) { 1052 mutex_exit(&kpd->kp_lock); 1053 return (EACCES); 1054 } 1055 mutex_exit(&kpd->kp_lock); 1056 return (0); 1057 } 1058 1059 1060 /* 1061 * Check to see if it makes sense to do kluster/read ahead to 1062 * addr + delta relative to the mapping at addr. We assume here 1063 * that delta is a signed PAGESIZE'd multiple (which can be negative). 1064 * 1065 * For seg_u we always "approve" of this action from our standpoint. 1066 */ 1067 /*ARGSUSED*/ 1068 static int 1069 segkp_kluster(struct seg *seg, caddr_t addr, ssize_t delta) 1070 { 1071 return (0); 1072 } 1073 1074 /* 1075 * Load and possibly lock intra-slot resources in the range given by 1076 * vaddr and len. 1077 */ 1078 static int 1079 segkp_load( 1080 struct hat *hat, 1081 struct seg *seg, 1082 caddr_t vaddr, 1083 size_t len, 1084 struct segkp_data *kpd, 1085 uint_t flags) 1086 { 1087 caddr_t va; 1088 caddr_t vlim; 1089 ulong_t i; 1090 uint_t lock; 1091 1092 ASSERT(MUTEX_HELD(&kpd->kp_lock)); 1093 1094 len = P2ROUNDUP(len, PAGESIZE); 1095 1096 /* If locking, reserve physical memory */ 1097 if (flags & KPD_LOCKED) { 1098 pgcnt_t pages = btop(len); 1099 if ((kpd->kp_flags & KPD_NO_ANON) == 0) 1100 atomic_add_long(&anon_segkp_pages_locked, pages); 1101 (void) page_resv(pages, KM_SLEEP); 1102 } 1103 1104 /* 1105 * Loop through the pages in the given range. 1106 */ 1107 va = (caddr_t)((uintptr_t)vaddr & (uintptr_t)PAGEMASK); 1108 vaddr = va; 1109 vlim = va + len; 1110 lock = flags & KPD_LOCKED; 1111 i = ((uintptr_t)(va - kpd->kp_base)) >> PAGESHIFT; 1112 for (; va < vlim; va += PAGESIZE, i++) { 1113 page_t *pl[2]; /* second element NULL terminator */ 1114 struct vnode *vp; 1115 anoff_t off; 1116 int err; 1117 struct anon *ap; 1118 1119 /* 1120 * Summon the page. If it's not resident, arrange 1121 * for synchronous i/o to pull it in. 1122 */ 1123 ap = anon_get_ptr(kpd->kp_anon, kpd->kp_anon_idx + i); 1124 swap_xlate(ap, &vp, &off); 1125 1126 /* 1127 * The returned page list will have exactly one entry, 1128 * which is returned to us already kept. 1129 */ 1130 err = VOP_GETPAGE(vp, (offset_t)off, PAGESIZE, NULL, 1131 pl, PAGESIZE, seg, va, S_READ, kcred, NULL); 1132 1133 if (err) { 1134 /* 1135 * Back out of what we've done so far. 1136 */ 1137 (void) segkp_unlock(hat, seg, vaddr, 1138 (va - vaddr), kpd, flags); 1139 return (err); 1140 } 1141 1142 /* 1143 * Load an MMU translation for the page. 1144 */ 1145 hat_memload(hat, va, pl[0], (PROT_READ|PROT_WRITE), 1146 lock ? HAT_LOAD_LOCK : HAT_LOAD); 1147 1148 if (!lock) { 1149 /* 1150 * Now, release "shared" lock on the page. 1151 */ 1152 page_unlock(pl[0]); 1153 } 1154 } 1155 return (0); 1156 } 1157 1158 /* 1159 * At the very least unload the mmu-translations and unlock the range if locked 1160 * Can be called with the following flag value KPD_WRITEDIRTY which specifies 1161 * any dirty pages should be written to disk. 1162 */ 1163 static int 1164 segkp_unlock( 1165 struct hat *hat, 1166 struct seg *seg, 1167 caddr_t vaddr, 1168 size_t len, 1169 struct segkp_data *kpd, 1170 uint_t flags) 1171 { 1172 caddr_t va; 1173 caddr_t vlim; 1174 ulong_t i; 1175 struct page *pp; 1176 struct vnode *vp; 1177 anoff_t off; 1178 struct anon *ap; 1179 1180 #ifdef lint 1181 seg = seg; 1182 #endif /* lint */ 1183 1184 ASSERT(MUTEX_HELD(&kpd->kp_lock)); 1185 1186 /* 1187 * Loop through the pages in the given range. It is assumed 1188 * segkp_unlock is called with page aligned base 1189 */ 1190 va = vaddr; 1191 vlim = va + len; 1192 i = ((uintptr_t)(va - kpd->kp_base)) >> PAGESHIFT; 1193 hat_unload(hat, va, len, 1194 ((flags & KPD_LOCKED) ? HAT_UNLOAD_UNLOCK : HAT_UNLOAD)); 1195 for (; va < vlim; va += PAGESIZE, i++) { 1196 /* 1197 * Find the page associated with this part of the 1198 * slot, tracking it down through its associated swap 1199 * space. 1200 */ 1201 ap = anon_get_ptr(kpd->kp_anon, kpd->kp_anon_idx + i); 1202 swap_xlate(ap, &vp, &off); 1203 1204 if (flags & KPD_LOCKED) { 1205 if ((pp = page_find(vp, off)) == NULL) { 1206 if (flags & KPD_LOCKED) { 1207 panic("segkp_softunlock: missing page"); 1208 /*NOTREACHED*/ 1209 } 1210 } 1211 } else { 1212 /* 1213 * Nothing to do if the slot is not locked and the 1214 * page doesn't exist. 1215 */ 1216 if ((pp = page_lookup(vp, off, SE_SHARED)) == NULL) 1217 continue; 1218 } 1219 1220 /* 1221 * If the page doesn't have any translations, is 1222 * dirty and not being shared, then push it out 1223 * asynchronously and avoid waiting for the 1224 * pageout daemon to do it for us. 1225 * 1226 * XXX - Do we really need to get the "exclusive" 1227 * lock via an upgrade? 1228 */ 1229 if ((flags & KPD_WRITEDIRTY) && !hat_page_is_mapped(pp) && 1230 hat_ismod(pp) && page_tryupgrade(pp)) { 1231 /* 1232 * Hold the vnode before releasing the page lock to 1233 * prevent it from being freed and re-used by some 1234 * other thread. 1235 */ 1236 VN_HOLD(vp); 1237 page_unlock(pp); 1238 1239 /* 1240 * Want most powerful credentials we can get so 1241 * use kcred. 1242 */ 1243 (void) VOP_PUTPAGE(vp, (offset_t)off, PAGESIZE, 1244 B_ASYNC | B_FREE, kcred, NULL); 1245 VN_RELE(vp); 1246 } else { 1247 page_unlock(pp); 1248 } 1249 } 1250 1251 /* If unlocking, release physical memory */ 1252 if (flags & KPD_LOCKED) { 1253 pgcnt_t pages = btopr(len); 1254 if ((kpd->kp_flags & KPD_NO_ANON) == 0) 1255 atomic_add_long(&anon_segkp_pages_locked, -pages); 1256 page_unresv(pages); 1257 } 1258 return (0); 1259 } 1260 1261 /* 1262 * Insert the kpd in the hash table. 1263 */ 1264 static void 1265 segkp_insert(struct seg *seg, struct segkp_data *kpd) 1266 { 1267 struct segkp_segdata *kpsd = (struct segkp_segdata *)seg->s_data; 1268 int index; 1269 1270 /* 1271 * Insert the kpd based on the address that will be returned 1272 * via segkp_release. 1273 */ 1274 index = SEGKP_HASH(stom(kpd->kp_base, kpd->kp_flags)); 1275 mutex_enter(&segkp_lock); 1276 kpd->kp_next = kpsd->kpsd_hash[index]; 1277 kpsd->kpsd_hash[index] = kpd; 1278 mutex_exit(&segkp_lock); 1279 } 1280 1281 /* 1282 * Remove kpd from the hash table. 1283 */ 1284 static void 1285 segkp_delete(struct seg *seg, struct segkp_data *kpd) 1286 { 1287 struct segkp_segdata *kpsd = (struct segkp_segdata *)seg->s_data; 1288 struct segkp_data **kpp; 1289 int index; 1290 1291 ASSERT(MUTEX_HELD(&segkp_lock)); 1292 1293 index = SEGKP_HASH(stom(kpd->kp_base, kpd->kp_flags)); 1294 for (kpp = &kpsd->kpsd_hash[index]; 1295 *kpp != NULL; kpp = &((*kpp)->kp_next)) { 1296 if (*kpp == kpd) { 1297 *kpp = kpd->kp_next; 1298 return; 1299 } 1300 } 1301 panic("segkp_delete: unable to find element to delete"); 1302 /*NOTREACHED*/ 1303 } 1304 1305 /* 1306 * Find the kpd associated with a vaddr. 1307 * 1308 * Most of the callers of segkp_find will pass the vaddr that 1309 * hashes to the desired index, but there are cases where 1310 * this is not true in which case we have to (potentially) scan 1311 * the whole table looking for it. This should be very rare 1312 * (e.g. a segkp_fault(F_INVAL) on an address somewhere in the 1313 * middle of the segkp_data region). 1314 */ 1315 static struct segkp_data * 1316 segkp_find(struct seg *seg, caddr_t vaddr) 1317 { 1318 struct segkp_segdata *kpsd = (struct segkp_segdata *)seg->s_data; 1319 struct segkp_data *kpd; 1320 int i; 1321 int stop; 1322 1323 i = stop = SEGKP_HASH(vaddr); 1324 mutex_enter(&segkp_lock); 1325 do { 1326 for (kpd = kpsd->kpsd_hash[i]; kpd != NULL; 1327 kpd = kpd->kp_next) { 1328 if (vaddr >= kpd->kp_base && 1329 vaddr < kpd->kp_base + kpd->kp_len) { 1330 mutex_exit(&segkp_lock); 1331 return (kpd); 1332 } 1333 } 1334 if (--i < 0) 1335 i = SEGKP_HASHSZ - 1; /* Wrap */ 1336 } while (i != stop); 1337 mutex_exit(&segkp_lock); 1338 return (NULL); /* Not found */ 1339 } 1340 1341 /* 1342 * Dump out all the active segkp pages 1343 */ 1344 static void 1345 segkp_dump(struct seg *seg) 1346 { 1347 int i; 1348 struct segkp_data *kpd; 1349 struct segkp_segdata *kpsd = (struct segkp_segdata *)seg->s_data; 1350 1351 for (i = 0; i < SEGKP_HASHSZ; i++) { 1352 for (kpd = kpsd->kpsd_hash[i]; 1353 kpd != NULL; kpd = kpd->kp_next) { 1354 pfn_t pfn; 1355 caddr_t addr; 1356 caddr_t eaddr; 1357 1358 addr = kpd->kp_base; 1359 eaddr = addr + kpd->kp_len; 1360 while (addr < eaddr) { 1361 ASSERT(seg->s_as == &kas); 1362 pfn = hat_getpfnum(seg->s_as->a_hat, addr); 1363 if (pfn != PFN_INVALID) 1364 dump_addpage(seg->s_as, addr, pfn); 1365 addr += PAGESIZE; 1366 dump_timeleft = dump_timeout; 1367 } 1368 } 1369 } 1370 } 1371 1372 /*ARGSUSED*/ 1373 static int 1374 segkp_pagelock(struct seg *seg, caddr_t addr, size_t len, 1375 struct page ***ppp, enum lock_type type, enum seg_rw rw) 1376 { 1377 return (ENOTSUP); 1378 } 1379 1380 /*ARGSUSED*/ 1381 static int 1382 segkp_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp) 1383 { 1384 return (ENODEV); 1385 } 1386 1387 /*ARGSUSED*/ 1388 static lgrp_mem_policy_info_t * 1389 segkp_getpolicy(struct seg *seg, caddr_t addr) 1390 { 1391 return (NULL); 1392 } 1393 1394 /*ARGSUSED*/ 1395 static int 1396 segkp_capable(struct seg *seg, segcapability_t capability) 1397 { 1398 return (0); 1399 } 1400 1401 #include <sys/mem_config.h> 1402 1403 /*ARGSUSED*/ 1404 static void 1405 segkp_mem_config_post_add(void *arg, pgcnt_t delta_pages) 1406 {} 1407 1408 /* 1409 * During memory delete, turn off caches so that pages are not held. 1410 * A better solution may be to unlock the pages while they are 1411 * in the cache so that they may be collected naturally. 1412 */ 1413 1414 /*ARGSUSED*/ 1415 static int 1416 segkp_mem_config_pre_del(void *arg, pgcnt_t delta_pages) 1417 { 1418 atomic_inc_32(&segkp_indel); 1419 segkp_cache_free(); 1420 return (0); 1421 } 1422 1423 /*ARGSUSED*/ 1424 static void 1425 segkp_mem_config_post_del(void *arg, pgcnt_t delta_pages, int cancelled) 1426 { 1427 atomic_dec_32(&segkp_indel); 1428 } 1429 1430 static kphysm_setup_vector_t segkp_mem_config_vec = { 1431 KPHYSM_SETUP_VECTOR_VERSION, 1432 segkp_mem_config_post_add, 1433 segkp_mem_config_pre_del, 1434 segkp_mem_config_post_del, 1435 }; 1436 1437 static void 1438 segkpinit_mem_config(struct seg *seg) 1439 { 1440 int ret; 1441 1442 ret = kphysm_setup_func_register(&segkp_mem_config_vec, (void *)seg); 1443 ASSERT(ret == 0); 1444 }