1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2008-2015 Nathan Whitehorn 5 * All rights reserved. 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 the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30/* 31 * Manages physical address maps. 32 * 33 * Since the information managed by this module is also stored by the 34 * logical address mapping module, this module may throw away valid virtual 35 * to physical mappings at almost any time. However, invalidations of 36 * mappings must be done as requested. 37 * 38 * In order to cope with hardware architectures which make virtual to 39 * physical map invalidates expensive, this module may delay invalidate 40 * reduced protection operations until such time as they are actually 41 * necessary. This module is given full information as to which processors 42 * are currently using which maps, and to when physical maps must be made 43 * correct. 44 */ 45 46#include "opt_kstack_pages.h" 47 48#include <sys/param.h> 49#include <sys/kernel.h> 50#include <sys/conf.h> 51#include <sys/queue.h> 52#include <sys/cpuset.h> 53#include <sys/kerneldump.h> 54#include <sys/ktr.h> 55#include <sys/lock.h> 56#include <sys/msgbuf.h> 57#include <sys/malloc.h> 58#include <sys/mman.h> 59#include <sys/mutex.h> 60#include <sys/proc.h> 61#include <sys/rwlock.h> 62#include <sys/sched.h> 63#include <sys/sysctl.h> 64#include <sys/systm.h> 65#include <sys/vmmeter.h> 66#include <sys/smp.h> 67#include <sys/reboot.h> 68 69#include <sys/kdb.h> 70 71#include <dev/ofw/openfirm.h> 72 73#include <vm/vm.h> 74#include <vm/pmap.h> 75#include <vm/vm_param.h> 76#include <vm/vm_kern.h> 77#include <vm/vm_page.h> 78#include <vm/vm_phys.h> 79#include <vm/vm_map.h> 80#include <vm/vm_object.h> 81#include <vm/vm_extern.h> 82#include <vm/vm_pageout.h> 83#include <vm/vm_dumpset.h> 84#include <vm/vm_reserv.h> 85#include <vm/uma.h> 86 87#include <machine/_inttypes.h> 88#include <machine/cpu.h> 89#include <machine/ifunc.h> 90#include <machine/platform.h> 91#include <machine/frame.h> 92#include <machine/md_var.h> 93#include <machine/psl.h> 94#include <machine/bat.h> 95#include <machine/hid.h> 96#include <machine/pte.h> 97#include <machine/sr.h> 98#include <machine/trap.h> 99#include <machine/mmuvar.h> 100 101#include "mmu_oea64.h" 102 103void moea64_release_vsid(uint64_t vsid); 104uintptr_t moea64_get_unique_vsid(void); 105 106#define DISABLE_TRANS(msr) msr = mfmsr(); mtmsr(msr & ~PSL_DR) 107#define ENABLE_TRANS(msr) mtmsr(msr) 108 109#define VSID_MAKE(sr, hash) ((sr) | (((hash) & 0xfffff) << 4)) 110#define VSID_TO_HASH(vsid) (((vsid) >> 4) & 0xfffff) 111#define VSID_HASH_MASK 0x0000007fffffffffULL 112 113/* 114 * Locking semantics: 115 * 116 * There are two locks of interest: the page locks and the pmap locks, which 117 * protect their individual PVO lists and are locked in that order. The contents 118 * of all PVO entries are protected by the locks of their respective pmaps. 119 * The pmap of any PVO is guaranteed not to change so long as the PVO is linked 120 * into any list. 121 * 122 */ 123 124#define PV_LOCK_COUNT PA_LOCK_COUNT 125static struct mtx_padalign pv_lock[PV_LOCK_COUNT]; 126 127/* 128 * Cheap NUMA-izing of the pv locks, to reduce contention across domains. 129 * NUMA domains on POWER9 appear to be indexed as sparse memory spaces, with the 130 * index at (N << 45). 131 */ 132#ifdef __powerpc64__ 133#define PV_LOCK_IDX(pa) ((pa_index(pa) * (((pa) >> 45) + 1)) % PV_LOCK_COUNT) 134#else 135#define PV_LOCK_IDX(pa) (pa_index(pa) % PV_LOCK_COUNT) 136#endif 137#define PV_LOCKPTR(pa) ((struct mtx *)(&pv_lock[PV_LOCK_IDX(pa)])) 138#define PV_LOCK(pa) mtx_lock(PV_LOCKPTR(pa)) 139#define PV_UNLOCK(pa) mtx_unlock(PV_LOCKPTR(pa)) 140#define PV_LOCKASSERT(pa) mtx_assert(PV_LOCKPTR(pa), MA_OWNED) 141#define PV_PAGE_LOCK(m) PV_LOCK(VM_PAGE_TO_PHYS(m)) 142#define PV_PAGE_UNLOCK(m) PV_UNLOCK(VM_PAGE_TO_PHYS(m)) 143#define PV_PAGE_LOCKASSERT(m) PV_LOCKASSERT(VM_PAGE_TO_PHYS(m)) 144 145/* Superpage PV lock */ 146 147#define PV_LOCK_SIZE (1<<PDRSHIFT) 148 149static __always_inline void 150moea64_sp_pv_lock(vm_paddr_t pa) 151{ 152 vm_paddr_t pa_end; 153 154 /* Note: breaking when pa_end is reached to avoid overflows */ 155 pa_end = pa + (HPT_SP_SIZE - PV_LOCK_SIZE); 156 for (;;) { 157 mtx_lock_flags(PV_LOCKPTR(pa), MTX_DUPOK); 158 if (pa == pa_end) 159 break; 160 pa += PV_LOCK_SIZE; 161 } 162} 163 164static __always_inline void 165moea64_sp_pv_unlock(vm_paddr_t pa) 166{ 167 vm_paddr_t pa_end; 168 169 /* Note: breaking when pa_end is reached to avoid overflows */ 170 pa_end = pa; 171 pa += HPT_SP_SIZE - PV_LOCK_SIZE; 172 for (;;) { 173 mtx_unlock_flags(PV_LOCKPTR(pa), MTX_DUPOK); 174 if (pa == pa_end) 175 break; 176 pa -= PV_LOCK_SIZE; 177 } 178} 179 180#define SP_PV_LOCK_ALIGNED(pa) moea64_sp_pv_lock(pa) 181#define SP_PV_UNLOCK_ALIGNED(pa) moea64_sp_pv_unlock(pa) 182#define SP_PV_LOCK(pa) moea64_sp_pv_lock((pa) & ~HPT_SP_MASK) 183#define SP_PV_UNLOCK(pa) moea64_sp_pv_unlock((pa) & ~HPT_SP_MASK) 184#define SP_PV_PAGE_LOCK(m) SP_PV_LOCK(VM_PAGE_TO_PHYS(m)) 185#define SP_PV_PAGE_UNLOCK(m) SP_PV_UNLOCK(VM_PAGE_TO_PHYS(m)) 186 187struct ofw_map { 188 cell_t om_va; 189 cell_t om_len; 190 uint64_t om_pa; 191 cell_t om_mode; 192}; 193 194extern unsigned char _etext[]; 195extern unsigned char _end[]; 196 197extern void *slbtrap, *slbtrapend; 198 199/* 200 * Map of physical memory regions. 201 */ 202static struct mem_region *regions; 203static struct mem_region *pregions; 204static struct numa_mem_region *numa_pregions; 205static u_int phys_avail_count; 206static int regions_sz, pregions_sz, numapregions_sz; 207 208extern void bs_remap_earlyboot(void); 209 210/* 211 * Lock for the SLB tables. 212 */ 213struct mtx moea64_slb_mutex; 214 215/* 216 * PTEG data. 217 */ 218u_long moea64_pteg_count; 219u_long moea64_pteg_mask; 220 221/* 222 * PVO data. 223 */ 224 225uma_zone_t moea64_pvo_zone; /* zone for pvo entries */ 226 227static struct pvo_entry *moea64_bpvo_pool; 228static int moea64_bpvo_pool_index = 0; 229static int moea64_bpvo_pool_size = 0; 230SYSCTL_INT(_machdep, OID_AUTO, moea64_allocated_bpvo_entries, CTLFLAG_RD, 231 &moea64_bpvo_pool_index, 0, ""); 232 233#define BPVO_POOL_SIZE 327680 /* Sensible historical default value */ 234#define BPVO_POOL_EXPANSION_FACTOR 3 235#define VSID_NBPW (sizeof(u_int32_t) * 8) 236#ifdef __powerpc64__ 237#define NVSIDS (NPMAPS * 16) 238#define VSID_HASHMASK 0xffffffffUL 239#else 240#define NVSIDS NPMAPS 241#define VSID_HASHMASK 0xfffffUL 242#endif 243static u_int moea64_vsid_bitmap[NVSIDS / VSID_NBPW]; 244 245static bool moea64_initialized = false; 246 247#ifdef MOEA64_STATS 248/* 249 * Statistics. 250 */ 251u_int moea64_pte_valid = 0; 252u_int moea64_pte_overflow = 0; 253u_int moea64_pvo_entries = 0; 254u_int moea64_pvo_enter_calls = 0; 255u_int moea64_pvo_remove_calls = 0; 256SYSCTL_INT(_machdep, OID_AUTO, moea64_pte_valid, CTLFLAG_RD, 257 &moea64_pte_valid, 0, ""); 258SYSCTL_INT(_machdep, OID_AUTO, moea64_pte_overflow, CTLFLAG_RD, 259 &moea64_pte_overflow, 0, ""); 260SYSCTL_INT(_machdep, OID_AUTO, moea64_pvo_entries, CTLFLAG_RD, 261 &moea64_pvo_entries, 0, ""); 262SYSCTL_INT(_machdep, OID_AUTO, moea64_pvo_enter_calls, CTLFLAG_RD, 263 &moea64_pvo_enter_calls, 0, ""); 264SYSCTL_INT(_machdep, OID_AUTO, moea64_pvo_remove_calls, CTLFLAG_RD, 265 &moea64_pvo_remove_calls, 0, ""); 266#endif 267 268vm_offset_t moea64_scratchpage_va[2]; 269struct pvo_entry *moea64_scratchpage_pvo[2]; 270struct mtx moea64_scratchpage_mtx; 271 272uint64_t moea64_large_page_mask = 0; 273uint64_t moea64_large_page_size = 0; 274int moea64_large_page_shift = 0; 275bool moea64_has_lp_4k_16m = false; 276 277/* 278 * PVO calls. 279 */ 280static int moea64_pvo_enter(struct pvo_entry *pvo, 281 struct pvo_head *pvo_head, struct pvo_entry **oldpvo); 282static void moea64_pvo_remove_from_pmap(struct pvo_entry *pvo); 283static void moea64_pvo_remove_from_page(struct pvo_entry *pvo); 284static void moea64_pvo_remove_from_page_locked( 285 struct pvo_entry *pvo, vm_page_t m); 286static struct pvo_entry *moea64_pvo_find_va(pmap_t, vm_offset_t); 287 288/* 289 * Utility routines. 290 */ 291static bool moea64_query_bit(vm_page_t, uint64_t); 292static u_int moea64_clear_bit(vm_page_t, uint64_t); 293static void moea64_kremove(vm_offset_t); 294static void moea64_syncicache(pmap_t pmap, vm_offset_t va, 295 vm_paddr_t pa, vm_size_t sz); 296static void moea64_pmap_init_qpages(void); 297static void moea64_remove_locked(pmap_t, vm_offset_t, 298 vm_offset_t, struct pvo_dlist *); 299 300/* 301 * Superpages data and routines. 302 */ 303 304/* 305 * PVO flags (in vaddr) that must match for promotion to succeed. 306 * Note that protection bits are checked separately, as they reside in 307 * another field. 308 */ 309#define PVO_FLAGS_PROMOTE (PVO_WIRED | PVO_MANAGED | PVO_PTEGIDX_VALID) 310 311#define PVO_IS_SP(pvo) (((pvo)->pvo_vaddr & PVO_LARGE) && \ 312 (pvo)->pvo_pmap != kernel_pmap) 313 314/* Get physical address from PVO. */ 315#define PVO_PADDR(pvo) moea64_pvo_paddr(pvo) 316 317/* MD page flag indicating that the page is a superpage. */ 318#define MDPG_ATTR_SP 0x40000000 319 320SYSCTL_DECL(_vm_pmap); 321 322static SYSCTL_NODE(_vm_pmap, OID_AUTO, sp, CTLFLAG_RD, 0, 323 "SP page mapping counters"); 324 325static u_long sp_demotions; 326SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, demotions, CTLFLAG_RD, 327 &sp_demotions, 0, "SP page demotions"); 328 329static u_long sp_mappings; 330SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, mappings, CTLFLAG_RD, 331 &sp_mappings, 0, "SP page mappings"); 332 333static u_long sp_p_failures; 334SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, p_failures, CTLFLAG_RD, 335 &sp_p_failures, 0, "SP page promotion failures"); 336 337static u_long sp_p_fail_pa; 338SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, p_fail_pa, CTLFLAG_RD, 339 &sp_p_fail_pa, 0, "SP page promotion failure: PAs don't match"); 340 341static u_long sp_p_fail_flags; 342SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, p_fail_flags, CTLFLAG_RD, 343 &sp_p_fail_flags, 0, "SP page promotion failure: page flags don't match"); 344 345static u_long sp_p_fail_prot; 346SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, p_fail_prot, CTLFLAG_RD, 347 &sp_p_fail_prot, 0, 348 "SP page promotion failure: page protections don't match"); 349 350static u_long sp_p_fail_wimg; 351SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, p_fail_wimg, CTLFLAG_RD, 352 &sp_p_fail_wimg, 0, "SP page promotion failure: WIMG bits don't match"); 353 354static u_long sp_promotions; 355SYSCTL_ULONG(_vm_pmap_sp, OID_AUTO, promotions, CTLFLAG_RD, 356 &sp_promotions, 0, "SP page promotions"); 357 358static bool moea64_ps_enabled(pmap_t); 359static void moea64_align_superpage(vm_object_t, vm_ooffset_t, 360 vm_offset_t *, vm_size_t); 361 362static int moea64_sp_enter(pmap_t pmap, vm_offset_t va, 363 vm_page_t m, vm_prot_t prot, u_int flags, int8_t psind); 364static struct pvo_entry *moea64_sp_remove(struct pvo_entry *sp, 365 struct pvo_dlist *tofree); 366 367static void moea64_sp_promote(pmap_t pmap, vm_offset_t va, vm_page_t m); 368static void moea64_sp_demote_aligned(struct pvo_entry *sp); 369static void moea64_sp_demote(struct pvo_entry *pvo); 370 371static struct pvo_entry *moea64_sp_unwire(struct pvo_entry *sp); 372static struct pvo_entry *moea64_sp_protect(struct pvo_entry *sp, 373 vm_prot_t prot); 374 375static int64_t moea64_sp_query(struct pvo_entry *pvo, uint64_t ptebit); 376static int64_t moea64_sp_clear(struct pvo_entry *pvo, vm_page_t m, 377 uint64_t ptebit); 378 379static __inline bool moea64_sp_pvo_in_range(struct pvo_entry *pvo, 380 vm_offset_t sva, vm_offset_t eva); 381 382/* 383 * Kernel MMU interface 384 */ 385void moea64_clear_modify(vm_page_t); 386void moea64_copy_page(vm_page_t, vm_page_t); 387void moea64_copy_page_dmap(vm_page_t, vm_page_t); 388void moea64_copy_pages(vm_page_t *ma, vm_offset_t a_offset, 389 vm_page_t *mb, vm_offset_t b_offset, int xfersize); 390void moea64_copy_pages_dmap(vm_page_t *ma, vm_offset_t a_offset, 391 vm_page_t *mb, vm_offset_t b_offset, int xfersize); 392int moea64_enter(pmap_t, vm_offset_t, vm_page_t, vm_prot_t, 393 u_int flags, int8_t psind); 394void moea64_enter_object(pmap_t, vm_offset_t, vm_offset_t, vm_page_t, 395 vm_prot_t); 396void moea64_enter_quick(pmap_t, vm_offset_t, vm_page_t, vm_prot_t); 397vm_paddr_t moea64_extract(pmap_t, vm_offset_t); 398vm_page_t moea64_extract_and_hold(pmap_t, vm_offset_t, vm_prot_t); 399void moea64_init(void); 400bool moea64_is_modified(vm_page_t); 401bool moea64_is_prefaultable(pmap_t, vm_offset_t); 402bool moea64_is_referenced(vm_page_t); 403int moea64_ts_referenced(vm_page_t); 404vm_offset_t moea64_map(vm_offset_t *, vm_paddr_t, vm_paddr_t, int); 405bool moea64_page_exists_quick(pmap_t, vm_page_t); 406void moea64_page_init(vm_page_t); 407int moea64_page_wired_mappings(vm_page_t); 408int moea64_pinit(pmap_t); 409void moea64_pinit0(pmap_t); 410void moea64_protect(pmap_t, vm_offset_t, vm_offset_t, vm_prot_t); 411void moea64_qenter(vm_offset_t, vm_page_t *, int); 412void moea64_qremove(vm_offset_t, int); 413void moea64_release(pmap_t); 414void moea64_remove(pmap_t, vm_offset_t, vm_offset_t); 415void moea64_remove_pages(pmap_t); 416void moea64_remove_all(vm_page_t); 417void moea64_remove_write(vm_page_t); 418void moea64_unwire(pmap_t, vm_offset_t, vm_offset_t); 419void moea64_zero_page(vm_page_t); 420void moea64_zero_page_dmap(vm_page_t); 421void moea64_zero_page_area(vm_page_t, int, int); 422void moea64_activate(struct thread *); 423void moea64_deactivate(struct thread *); 424void *moea64_mapdev(vm_paddr_t, vm_size_t); 425void *moea64_mapdev_attr(vm_paddr_t, vm_size_t, vm_memattr_t); 426void moea64_unmapdev(void *, vm_size_t); 427vm_paddr_t moea64_kextract(vm_offset_t); 428void moea64_page_set_memattr(vm_page_t m, vm_memattr_t ma); 429void moea64_kenter_attr(vm_offset_t, vm_paddr_t, vm_memattr_t ma); 430void moea64_kenter(vm_offset_t, vm_paddr_t); 431int moea64_dev_direct_mapped(vm_paddr_t, vm_size_t); 432static void moea64_sync_icache(pmap_t, vm_offset_t, vm_size_t); 433void moea64_dumpsys_map(vm_paddr_t pa, size_t sz, 434 void **va); 435void moea64_scan_init(void); 436vm_offset_t moea64_quick_enter_page(vm_page_t m); 437vm_offset_t moea64_quick_enter_page_dmap(vm_page_t m); 438void moea64_quick_remove_page(vm_offset_t addr); 439bool moea64_page_is_mapped(vm_page_t m); 440static int moea64_map_user_ptr(pmap_t pm, 441 volatile const void *uaddr, void **kaddr, size_t ulen, size_t *klen); 442static int moea64_decode_kernel_ptr(vm_offset_t addr, 443 int *is_user, vm_offset_t *decoded_addr); 444static size_t moea64_scan_pmap(struct bitset *dump_bitset); 445static void *moea64_dump_pmap_init(unsigned blkpgs); 446#ifdef __powerpc64__ 447static void moea64_page_array_startup(long); 448#endif 449static int moea64_mincore(pmap_t, vm_offset_t, vm_paddr_t *); 450 451static struct pmap_funcs moea64_methods = { 452 .clear_modify = moea64_clear_modify, 453 .copy_page = moea64_copy_page, 454 .copy_pages = moea64_copy_pages, 455 .enter = moea64_enter, 456 .enter_object = moea64_enter_object, 457 .enter_quick = moea64_enter_quick, 458 .extract = moea64_extract, 459 .extract_and_hold = moea64_extract_and_hold, 460 .init = moea64_init, 461 .is_modified = moea64_is_modified, 462 .is_prefaultable = moea64_is_prefaultable, 463 .is_referenced = moea64_is_referenced, 464 .ts_referenced = moea64_ts_referenced, 465 .map = moea64_map, 466 .mincore = moea64_mincore, 467 .page_exists_quick = moea64_page_exists_quick, 468 .page_init = moea64_page_init, 469 .page_wired_mappings = moea64_page_wired_mappings, 470 .pinit = moea64_pinit, 471 .pinit0 = moea64_pinit0, 472 .protect = moea64_protect, 473 .qenter = moea64_qenter, 474 .qremove = moea64_qremove, 475 .release = moea64_release, 476 .remove = moea64_remove, 477 .remove_pages = moea64_remove_pages, 478 .remove_all = moea64_remove_all, 479 .remove_write = moea64_remove_write, 480 .sync_icache = moea64_sync_icache, 481 .unwire = moea64_unwire, 482 .zero_page = moea64_zero_page, 483 .zero_page_area = moea64_zero_page_area, 484 .activate = moea64_activate, 485 .deactivate = moea64_deactivate, 486 .page_set_memattr = moea64_page_set_memattr, 487 .quick_enter_page = moea64_quick_enter_page, 488 .quick_remove_page = moea64_quick_remove_page, 489 .page_is_mapped = moea64_page_is_mapped, 490#ifdef __powerpc64__ 491 .page_array_startup = moea64_page_array_startup, 492#endif 493 .ps_enabled = moea64_ps_enabled, 494 .align_superpage = moea64_align_superpage, 495 496 /* Internal interfaces */ 497 .mapdev = moea64_mapdev, 498 .mapdev_attr = moea64_mapdev_attr, 499 .unmapdev = moea64_unmapdev, 500 .kextract = moea64_kextract, 501 .kenter = moea64_kenter, 502 .kenter_attr = moea64_kenter_attr, 503 .dev_direct_mapped = moea64_dev_direct_mapped, 504 .dumpsys_pa_init = moea64_scan_init, 505 .dumpsys_scan_pmap = moea64_scan_pmap, 506 .dumpsys_dump_pmap_init = moea64_dump_pmap_init, 507 .dumpsys_map_chunk = moea64_dumpsys_map, 508 .map_user_ptr = moea64_map_user_ptr, 509 .decode_kernel_ptr = moea64_decode_kernel_ptr, 510}; 511 512MMU_DEF(oea64_mmu, "mmu_oea64_base", moea64_methods); 513 514/* 515 * Get physical address from PVO. 516 * 517 * For superpages, the lower bits are not stored on pvo_pte.pa and must be 518 * obtained from VA. 519 */ 520static __always_inline vm_paddr_t 521moea64_pvo_paddr(struct pvo_entry *pvo) 522{ 523 vm_paddr_t pa; 524 525 pa = (pvo)->pvo_pte.pa & LPTE_RPGN; 526 527 if (PVO_IS_SP(pvo)) { 528 pa &= ~HPT_SP_MASK; /* This is needed to clear LPTE_LP bits. */ 529 pa |= PVO_VADDR(pvo) & HPT_SP_MASK; 530 } 531 return (pa); 532} 533 534static struct pvo_head * 535vm_page_to_pvoh(vm_page_t m) 536{ 537 538 mtx_assert(PV_LOCKPTR(VM_PAGE_TO_PHYS(m)), MA_OWNED); 539 return (&m->md.mdpg_pvoh); 540} 541 542static struct pvo_entry * 543alloc_pvo_entry(int bootstrap) 544{ 545 struct pvo_entry *pvo; 546 547 if (!moea64_initialized || bootstrap) { 548 if (moea64_bpvo_pool_index >= moea64_bpvo_pool_size) { 549 panic("%s: bpvo pool exhausted, index=%d, size=%d, bytes=%zd." 550 "Try setting machdep.moea64_bpvo_pool_size tunable", 551 __func__, moea64_bpvo_pool_index, 552 moea64_bpvo_pool_size, 553 moea64_bpvo_pool_size * sizeof(struct pvo_entry)); 554 } 555 pvo = &moea64_bpvo_pool[ 556 atomic_fetchadd_int(&moea64_bpvo_pool_index, 1)]; 557 bzero(pvo, sizeof(*pvo)); 558 pvo->pvo_vaddr = PVO_BOOTSTRAP; 559 } else 560 pvo = uma_zalloc(moea64_pvo_zone, M_NOWAIT | M_ZERO); 561 562 return (pvo); 563} 564 565static void 566init_pvo_entry(struct pvo_entry *pvo, pmap_t pmap, vm_offset_t va) 567{ 568 uint64_t vsid; 569 uint64_t hash; 570 int shift; 571 572 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 573 574 pvo->pvo_pmap = pmap; 575 va &= ~ADDR_POFF; 576 pvo->pvo_vaddr |= va; 577 vsid = va_to_vsid(pmap, va); 578 pvo->pvo_vpn = (uint64_t)((va & ADDR_PIDX) >> ADDR_PIDX_SHFT) 579 | (vsid << 16); 580 581 if (pmap == kernel_pmap && (pvo->pvo_vaddr & PVO_LARGE) != 0) 582 shift = moea64_large_page_shift; 583 else 584 shift = ADDR_PIDX_SHFT; 585 hash = (vsid & VSID_HASH_MASK) ^ (((uint64_t)va & ADDR_PIDX) >> shift); 586 pvo->pvo_pte.slot = (hash & moea64_pteg_mask) << 3; 587} 588 589static void 590free_pvo_entry(struct pvo_entry *pvo) 591{ 592 593 if (!(pvo->pvo_vaddr & PVO_BOOTSTRAP)) 594 uma_zfree(moea64_pvo_zone, pvo); 595} 596 597void 598moea64_pte_from_pvo(const struct pvo_entry *pvo, struct lpte *lpte) 599{ 600 601 lpte->pte_hi = moea64_pte_vpn_from_pvo_vpn(pvo); 602 lpte->pte_hi |= LPTE_VALID; 603 604 if (pvo->pvo_vaddr & PVO_LARGE) 605 lpte->pte_hi |= LPTE_BIG; 606 if (pvo->pvo_vaddr & PVO_WIRED) 607 lpte->pte_hi |= LPTE_WIRED; 608 if (pvo->pvo_vaddr & PVO_HID) 609 lpte->pte_hi |= LPTE_HID; 610 611 lpte->pte_lo = pvo->pvo_pte.pa; /* Includes WIMG bits */ 612 if (pvo->pvo_pte.prot & VM_PROT_WRITE) 613 lpte->pte_lo |= LPTE_BW; 614 else 615 lpte->pte_lo |= LPTE_BR; 616 617 if (!(pvo->pvo_pte.prot & VM_PROT_EXECUTE)) 618 lpte->pte_lo |= LPTE_NOEXEC; 619} 620 621static __inline uint64_t 622moea64_calc_wimg(vm_paddr_t pa, vm_memattr_t ma) 623{ 624 uint64_t pte_lo; 625 int i; 626 627 if (ma != VM_MEMATTR_DEFAULT) { 628 switch (ma) { 629 case VM_MEMATTR_UNCACHEABLE: 630 return (LPTE_I | LPTE_G); 631 case VM_MEMATTR_CACHEABLE: 632 return (LPTE_M); 633 case VM_MEMATTR_WRITE_COMBINING: 634 case VM_MEMATTR_WRITE_BACK: 635 case VM_MEMATTR_PREFETCHABLE: 636 return (LPTE_I); 637 case VM_MEMATTR_WRITE_THROUGH: 638 return (LPTE_W | LPTE_M); 639 } 640 } 641 642 /* 643 * Assume the page is cache inhibited and access is guarded unless 644 * it's in our available memory array. 645 */ 646 pte_lo = LPTE_I | LPTE_G; 647 for (i = 0; i < pregions_sz; i++) { 648 if ((pa >= pregions[i].mr_start) && 649 (pa < (pregions[i].mr_start + pregions[i].mr_size))) { 650 pte_lo &= ~(LPTE_I | LPTE_G); 651 pte_lo |= LPTE_M; 652 break; 653 } 654 } 655 656 return pte_lo; 657} 658 659/* 660 * Quick sort callout for comparing memory regions. 661 */ 662static int om_cmp(const void *a, const void *b); 663 664static int 665om_cmp(const void *a, const void *b) 666{ 667 const struct ofw_map *mapa; 668 const struct ofw_map *mapb; 669 670 mapa = a; 671 mapb = b; 672 if (mapa->om_pa < mapb->om_pa) 673 return (-1); 674 else if (mapa->om_pa > mapb->om_pa) 675 return (1); 676 else 677 return (0); 678} 679 680static void 681moea64_add_ofw_mappings(phandle_t mmu, size_t sz) 682{ 683 struct ofw_map translations[sz/(4*sizeof(cell_t))]; /*>= 4 cells per */ 684 pcell_t acells, trans_cells[sz/sizeof(cell_t)]; 685 struct pvo_entry *pvo; 686 register_t msr; 687 vm_offset_t off; 688 vm_paddr_t pa_base; 689 int i, j; 690 691 bzero(translations, sz); 692 OF_getencprop(OF_finddevice("/"), "#address-cells", &acells, 693 sizeof(acells)); 694 if (OF_getencprop(mmu, "translations", trans_cells, sz) == -1) 695 panic("moea64_bootstrap: can't get ofw translations"); 696 697 CTR0(KTR_PMAP, "moea64_add_ofw_mappings: translations"); 698 sz /= sizeof(cell_t); 699 for (i = 0, j = 0; i < sz; j++) { 700 translations[j].om_va = trans_cells[i++]; 701 translations[j].om_len = trans_cells[i++]; 702 translations[j].om_pa = trans_cells[i++]; 703 if (acells == 2) { 704 translations[j].om_pa <<= 32; 705 translations[j].om_pa |= trans_cells[i++]; 706 } 707 translations[j].om_mode = trans_cells[i++]; 708 } 709 KASSERT(i == sz, ("Translations map has incorrect cell count (%d/%zd)", 710 i, sz)); 711 712 sz = j; 713 qsort(translations, sz, sizeof (*translations), om_cmp); 714 715 for (i = 0; i < sz; i++) { 716 pa_base = translations[i].om_pa; 717 #ifndef __powerpc64__ 718 if ((translations[i].om_pa >> 32) != 0) 719 panic("OFW translations above 32-bit boundary!"); 720 #endif 721 722 if (pa_base % PAGE_SIZE) 723 panic("OFW translation not page-aligned (phys)!"); 724 if (translations[i].om_va % PAGE_SIZE) 725 panic("OFW translation not page-aligned (virt)!"); 726 727 CTR3(KTR_PMAP, "translation: pa=%#zx va=%#x len=%#x", 728 pa_base, translations[i].om_va, translations[i].om_len); 729 730 /* Now enter the pages for this mapping */ 731 732 DISABLE_TRANS(msr); 733 for (off = 0; off < translations[i].om_len; off += PAGE_SIZE) { 734 /* If this address is direct-mapped, skip remapping */ 735 if (hw_direct_map && 736 translations[i].om_va == PHYS_TO_DMAP(pa_base) && 737 moea64_calc_wimg(pa_base + off, VM_MEMATTR_DEFAULT) 738 == LPTE_M) 739 continue; 740 741 PMAP_LOCK(kernel_pmap); 742 pvo = moea64_pvo_find_va(kernel_pmap, 743 translations[i].om_va + off); 744 PMAP_UNLOCK(kernel_pmap); 745 if (pvo != NULL) 746 continue; 747 748 moea64_kenter(translations[i].om_va + off, 749 pa_base + off); 750 } 751 ENABLE_TRANS(msr); 752 } 753} 754 755#ifdef __powerpc64__ 756static void 757moea64_probe_large_page(void) 758{ 759 uint16_t pvr = mfpvr() >> 16; 760 761 switch (pvr) { 762 case IBM970: 763 case IBM970FX: 764 case IBM970MP: 765 powerpc_sync(); isync(); 766 mtspr(SPR_HID4, mfspr(SPR_HID4) & ~HID4_970_DISABLE_LG_PG); 767 powerpc_sync(); isync(); 768 769 /* FALLTHROUGH */ 770 default: 771 if (moea64_large_page_size == 0) { 772 moea64_large_page_size = 0x1000000; /* 16 MB */ 773 moea64_large_page_shift = 24; 774 } 775 } 776 777 moea64_large_page_mask = moea64_large_page_size - 1; 778} 779 780static void 781moea64_bootstrap_slb_prefault(vm_offset_t va, int large) 782{ 783 struct slb *cache; 784 struct slb entry; 785 uint64_t esid, slbe; 786 uint64_t i; 787 788 cache = PCPU_GET(aim.slb); 789 esid = va >> ADDR_SR_SHFT; 790 slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID; 791 792 for (i = 0; i < 64; i++) { 793 if (cache[i].slbe == (slbe | i)) 794 return; 795 } 796 797 entry.slbe = slbe; 798 entry.slbv = KERNEL_VSID(esid) << SLBV_VSID_SHIFT; 799 if (large) 800 entry.slbv |= SLBV_L; 801 802 slb_insert_kernel(entry.slbe, entry.slbv); 803} 804#endif 805 806static int 807moea64_kenter_large(vm_offset_t va, vm_paddr_t pa, uint64_t attr, int bootstrap) 808{ 809 struct pvo_entry *pvo; 810 uint64_t pte_lo; 811 int error; 812 813 pte_lo = LPTE_M; 814 pte_lo |= attr; 815 816 pvo = alloc_pvo_entry(bootstrap); 817 pvo->pvo_vaddr |= PVO_WIRED | PVO_LARGE; 818 init_pvo_entry(pvo, kernel_pmap, va); 819 820 pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE | 821 VM_PROT_EXECUTE; 822 pvo->pvo_pte.pa = pa | pte_lo; 823 error = moea64_pvo_enter(pvo, NULL, NULL); 824 if (error != 0) 825 panic("Error %d inserting large page\n", error); 826 return (0); 827} 828 829static void 830moea64_setup_direct_map(vm_offset_t kernelstart, 831 vm_offset_t kernelend) 832{ 833 register_t msr; 834 vm_paddr_t pa, pkernelstart, pkernelend; 835 vm_offset_t size, off; 836 uint64_t pte_lo; 837 int i; 838 839 if (moea64_large_page_size == 0) 840 hw_direct_map = 0; 841 842 DISABLE_TRANS(msr); 843 if (hw_direct_map) { 844 PMAP_LOCK(kernel_pmap); 845 for (i = 0; i < pregions_sz; i++) { 846 for (pa = pregions[i].mr_start; pa < pregions[i].mr_start + 847 pregions[i].mr_size; pa += moea64_large_page_size) { 848 pte_lo = LPTE_M; 849 if (pa & moea64_large_page_mask) { 850 pa &= moea64_large_page_mask; 851 pte_lo |= LPTE_G; 852 } 853 if (pa + moea64_large_page_size > 854 pregions[i].mr_start + pregions[i].mr_size) 855 pte_lo |= LPTE_G; 856 857 moea64_kenter_large(PHYS_TO_DMAP(pa), pa, pte_lo, 1); 858 } 859 } 860 PMAP_UNLOCK(kernel_pmap); 861 } 862 863 /* 864 * Make sure the kernel and BPVO pool stay mapped on systems either 865 * without a direct map or on which the kernel is not already executing 866 * out of the direct-mapped region. 867 */ 868 if (kernelstart < DMAP_BASE_ADDRESS) { 869 /* 870 * For pre-dmap execution, we need to use identity mapping 871 * because we will be operating with the mmu on but in the 872 * wrong address configuration until we __restartkernel(). 873 */ 874 for (pa = kernelstart & ~PAGE_MASK; pa < kernelend; 875 pa += PAGE_SIZE) 876 moea64_kenter(pa, pa); 877 } else if (!hw_direct_map) { 878 pkernelstart = kernelstart & ~DMAP_BASE_ADDRESS; 879 pkernelend = kernelend & ~DMAP_BASE_ADDRESS; 880 for (pa = pkernelstart & ~PAGE_MASK; pa < pkernelend; 881 pa += PAGE_SIZE) 882 moea64_kenter(pa | DMAP_BASE_ADDRESS, pa); 883 } 884 885 if (!hw_direct_map) { 886 size = moea64_bpvo_pool_size*sizeof(struct pvo_entry); 887 off = (vm_offset_t)(moea64_bpvo_pool); 888 for (pa = off; pa < off + size; pa += PAGE_SIZE) 889 moea64_kenter(pa, pa); 890 891 /* Map exception vectors */ 892 for (pa = EXC_RSVD; pa < EXC_LAST; pa += PAGE_SIZE) 893 moea64_kenter(pa | DMAP_BASE_ADDRESS, pa); 894 } 895 ENABLE_TRANS(msr); 896 897 /* 898 * Allow user to override unmapped_buf_allowed for testing. 899 * XXXKIB Only direct map implementation was tested. 900 */ 901 if (!TUNABLE_INT_FETCH("vfs.unmapped_buf_allowed", 902 &unmapped_buf_allowed)) 903 unmapped_buf_allowed = hw_direct_map; 904} 905 906/* Quick sort callout for comparing physical addresses. */ 907static int 908pa_cmp(const void *a, const void *b) 909{ 910 const vm_paddr_t *pa = a, *pb = b; 911 912 if (*pa < *pb) 913 return (-1); 914 else if (*pa > *pb) 915 return (1); 916 else 917 return (0); 918} 919 920void 921moea64_early_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend) 922{ 923 int i, j; 924 vm_size_t physsz, hwphyssz; 925 vm_paddr_t kernelphysstart, kernelphysend; 926 int rm_pavail; 927 928 /* Level 0 reservations consist of 4096 pages (16MB superpage). */ 929 vm_level_0_order = 12; 930 931#ifndef __powerpc64__ 932 /* We don't have a direct map since there is no BAT */ 933 hw_direct_map = 0; 934 935 /* Make sure battable is zero, since we have no BAT */ 936 for (i = 0; i < 16; i++) { 937 battable[i].batu = 0; 938 battable[i].batl = 0; 939 } 940#else 941 /* Install trap handlers for SLBs */ 942 bcopy(&slbtrap, (void *)EXC_DSE,(size_t)&slbtrapend - (size_t)&slbtrap); 943 bcopy(&slbtrap, (void *)EXC_ISE,(size_t)&slbtrapend - (size_t)&slbtrap); 944 __syncicache((void *)EXC_DSE, 0x80); 945 __syncicache((void *)EXC_ISE, 0x80); 946#endif 947 948 kernelphysstart = kernelstart & ~DMAP_BASE_ADDRESS; 949 kernelphysend = kernelend & ~DMAP_BASE_ADDRESS; 950 951 /* Get physical memory regions from firmware */ 952 mem_regions(&pregions, &pregions_sz, ®ions, ®ions_sz); 953 CTR0(KTR_PMAP, "moea64_bootstrap: physical memory"); 954 955 if (PHYS_AVAIL_ENTRIES < regions_sz) 956 panic("moea64_bootstrap: phys_avail too small"); 957 958 phys_avail_count = 0; 959 physsz = 0; 960 hwphyssz = 0; 961 TUNABLE_ULONG_FETCH("hw.physmem", (u_long *) &hwphyssz); 962 for (i = 0, j = 0; i < regions_sz; i++, j += 2) { 963 CTR3(KTR_PMAP, "region: %#zx - %#zx (%#zx)", 964 regions[i].mr_start, regions[i].mr_start + 965 regions[i].mr_size, regions[i].mr_size); 966 if (hwphyssz != 0 && 967 (physsz + regions[i].mr_size) >= hwphyssz) { 968 if (physsz < hwphyssz) { 969 phys_avail[j] = regions[i].mr_start; 970 phys_avail[j + 1] = regions[i].mr_start + 971 hwphyssz - physsz; 972 physsz = hwphyssz; 973 phys_avail_count++; 974 dump_avail[j] = phys_avail[j]; 975 dump_avail[j + 1] = phys_avail[j + 1]; 976 } 977 break; 978 } 979 phys_avail[j] = regions[i].mr_start; 980 phys_avail[j + 1] = regions[i].mr_start + regions[i].mr_size; 981 phys_avail_count++; 982 physsz += regions[i].mr_size; 983 dump_avail[j] = phys_avail[j]; 984 dump_avail[j + 1] = phys_avail[j + 1]; 985 } 986 987 /* Check for overlap with the kernel and exception vectors */ 988 rm_pavail = 0; 989 for (j = 0; j < 2*phys_avail_count; j+=2) { 990 if (phys_avail[j] < EXC_LAST) 991 phys_avail[j] += EXC_LAST; 992 993 if (phys_avail[j] >= kernelphysstart && 994 phys_avail[j+1] <= kernelphysend) { 995 phys_avail[j] = phys_avail[j+1] = ~0; 996 rm_pavail++; 997 continue; 998 } 999 1000 if (kernelphysstart >= phys_avail[j] && 1001 kernelphysstart < phys_avail[j+1]) { 1002 if (kernelphysend < phys_avail[j+1]) { 1003 phys_avail[2*phys_avail_count] = 1004 (kernelphysend & ~PAGE_MASK) + PAGE_SIZE; 1005 phys_avail[2*phys_avail_count + 1] = 1006 phys_avail[j+1]; 1007 phys_avail_count++; 1008 } 1009 1010 phys_avail[j+1] = kernelphysstart & ~PAGE_MASK; 1011 } 1012 1013 if (kernelphysend >= phys_avail[j] && 1014 kernelphysend < phys_avail[j+1]) { 1015 if (kernelphysstart > phys_avail[j]) { 1016 phys_avail[2*phys_avail_count] = phys_avail[j]; 1017 phys_avail[2*phys_avail_count + 1] = 1018 kernelphysstart & ~PAGE_MASK; 1019 phys_avail_count++; 1020 } 1021 1022 phys_avail[j] = (kernelphysend & ~PAGE_MASK) + 1023 PAGE_SIZE; 1024 } 1025 } 1026 1027 /* Remove physical available regions marked for removal (~0) */ 1028 if (rm_pavail) { 1029 qsort(phys_avail, 2*phys_avail_count, sizeof(phys_avail[0]), 1030 pa_cmp); 1031 phys_avail_count -= rm_pavail; 1032 for (i = 2*phys_avail_count; 1033 i < 2*(phys_avail_count + rm_pavail); i+=2) 1034 phys_avail[i] = phys_avail[i+1] = 0; 1035 } 1036 1037 physmem = btoc(physsz); 1038 1039#ifdef PTEGCOUNT 1040 moea64_pteg_count = PTEGCOUNT; 1041#else 1042 moea64_pteg_count = 0x1000; 1043 1044 while (moea64_pteg_count < physmem) 1045 moea64_pteg_count <<= 1; 1046 1047 moea64_pteg_count >>= 1; 1048#endif /* PTEGCOUNT */ 1049} 1050 1051void 1052moea64_mid_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend) 1053{ 1054 int i; 1055 1056 /* 1057 * Set PTEG mask 1058 */ 1059 moea64_pteg_mask = moea64_pteg_count - 1; 1060 1061 /* 1062 * Initialize SLB table lock and page locks 1063 */ 1064 mtx_init(&moea64_slb_mutex, "SLB table", NULL, MTX_DEF); 1065 for (i = 0; i < PV_LOCK_COUNT; i++) 1066 mtx_init(&pv_lock[i], "page pv", NULL, MTX_DEF); 1067 1068 /* 1069 * Initialise the bootstrap pvo pool. 1070 */ 1071 TUNABLE_INT_FETCH("machdep.moea64_bpvo_pool_size", &moea64_bpvo_pool_size); 1072 if (moea64_bpvo_pool_size == 0) { 1073 if (!hw_direct_map) 1074 moea64_bpvo_pool_size = ((ptoa((uintmax_t)physmem) * sizeof(struct vm_page)) / 1075 (PAGE_SIZE * PAGE_SIZE)) * BPVO_POOL_EXPANSION_FACTOR; 1076 else 1077 moea64_bpvo_pool_size = BPVO_POOL_SIZE; 1078 } 1079 1080 if (boothowto & RB_VERBOSE) { 1081 printf("mmu_oea64: bpvo pool entries = %d, bpvo pool size = %zu MB\n", 1082 moea64_bpvo_pool_size, 1083 moea64_bpvo_pool_size*sizeof(struct pvo_entry) / 1048576); 1084 } 1085 1086 moea64_bpvo_pool = (struct pvo_entry *)moea64_bootstrap_alloc( 1087 moea64_bpvo_pool_size*sizeof(struct pvo_entry), PAGE_SIZE); 1088 moea64_bpvo_pool_index = 0; 1089 1090 /* Place at address usable through the direct map */ 1091 if (hw_direct_map) 1092 moea64_bpvo_pool = (struct pvo_entry *) 1093 PHYS_TO_DMAP((uintptr_t)moea64_bpvo_pool); 1094 1095 /* 1096 * Make sure kernel vsid is allocated as well as VSID 0. 1097 */ 1098 #ifndef __powerpc64__ 1099 moea64_vsid_bitmap[(KERNEL_VSIDBITS & (NVSIDS - 1)) / VSID_NBPW] 1100 |= 1 << (KERNEL_VSIDBITS % VSID_NBPW); 1101 moea64_vsid_bitmap[0] |= 1; 1102 #endif 1103 1104 /* 1105 * Initialize the kernel pmap (which is statically allocated). 1106 */ 1107 #ifdef __powerpc64__ 1108 for (i = 0; i < 64; i++) { 1109 pcpup->pc_aim.slb[i].slbv = 0; 1110 pcpup->pc_aim.slb[i].slbe = 0; 1111 } 1112 #else 1113 for (i = 0; i < 16; i++) 1114 kernel_pmap->pm_sr[i] = EMPTY_SEGMENT + i; 1115 #endif 1116 1117 kernel_pmap->pmap_phys = kernel_pmap; 1118 CPU_FILL(&kernel_pmap->pm_active); 1119 RB_INIT(&kernel_pmap->pmap_pvo); 1120 1121 PMAP_LOCK_INIT(kernel_pmap); 1122 1123 /* 1124 * Now map in all the other buffers we allocated earlier 1125 */ 1126 1127 moea64_setup_direct_map(kernelstart, kernelend); 1128} 1129 1130void 1131moea64_late_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend) 1132{ 1133 ihandle_t mmui; 1134 phandle_t chosen; 1135 phandle_t mmu; 1136 ssize_t sz; 1137 int i; 1138 vm_offset_t pa, va; 1139 void *dpcpu; 1140 1141 /* 1142 * Set up the Open Firmware pmap and add its mappings if not in real 1143 * mode. 1144 */ 1145 1146 chosen = OF_finddevice("/chosen"); 1147 if (chosen != -1 && OF_getencprop(chosen, "mmu", &mmui, 4) != -1) { 1148 mmu = OF_instance_to_package(mmui); 1149 if (mmu == -1 || 1150 (sz = OF_getproplen(mmu, "translations")) == -1) 1151 sz = 0; 1152 if (sz > 6144 /* tmpstksz - 2 KB headroom */) 1153 panic("moea64_bootstrap: too many ofw translations"); 1154 1155 if (sz > 0) 1156 moea64_add_ofw_mappings(mmu, sz); 1157 } 1158 1159 /* 1160 * Calculate the last available physical address. 1161 */ 1162 Maxmem = 0; 1163 for (i = 0; phys_avail[i + 1] != 0; i += 2) 1164 Maxmem = MAX(Maxmem, powerpc_btop(phys_avail[i + 1])); 1165 1166 /* 1167 * Initialize MMU. 1168 */ 1169 pmap_cpu_bootstrap(0); 1170 mtmsr(mfmsr() | PSL_DR | PSL_IR); 1171 pmap_bootstrapped++; 1172 1173 /* 1174 * Set the start and end of kva. 1175 */ 1176 virtual_avail = VM_MIN_KERNEL_ADDRESS; 1177 virtual_end = VM_MAX_SAFE_KERNEL_ADDRESS; 1178 1179 /* 1180 * Map the entire KVA range into the SLB. We must not fault there. 1181 */ 1182 #ifdef __powerpc64__ 1183 for (va = virtual_avail; va < virtual_end; va += SEGMENT_LENGTH) 1184 moea64_bootstrap_slb_prefault(va, 0); 1185 #endif 1186 1187 /* 1188 * Remap any early IO mappings (console framebuffer, etc.) 1189 */ 1190 bs_remap_earlyboot(); 1191 1192 /* 1193 * Figure out how far we can extend virtual_end into segment 16 1194 * without running into existing mappings. Segment 16 is guaranteed 1195 * to contain neither RAM nor devices (at least on Apple hardware), 1196 * but will generally contain some OFW mappings we should not 1197 * step on. 1198 */ 1199 1200 #ifndef __powerpc64__ /* KVA is in high memory on PPC64 */ 1201 PMAP_LOCK(kernel_pmap); 1202 while (virtual_end < VM_MAX_KERNEL_ADDRESS && 1203 moea64_pvo_find_va(kernel_pmap, virtual_end+1) == NULL) 1204 virtual_end += PAGE_SIZE; 1205 PMAP_UNLOCK(kernel_pmap); 1206 #endif 1207 1208 /* 1209 * Allocate a kernel stack with a guard page for thread0 and map it 1210 * into the kernel page map. 1211 */ 1212 pa = moea64_bootstrap_alloc(kstack_pages * PAGE_SIZE, PAGE_SIZE); 1213 va = virtual_avail + KSTACK_GUARD_PAGES * PAGE_SIZE; 1214 virtual_avail = va + kstack_pages * PAGE_SIZE; 1215 CTR2(KTR_PMAP, "moea64_bootstrap: kstack0 at %#x (%#x)", pa, va); 1216 thread0.td_kstack = va; 1217 thread0.td_kstack_pages = kstack_pages; 1218 for (i = 0; i < kstack_pages; i++) { 1219 moea64_kenter(va, pa); 1220 pa += PAGE_SIZE; 1221 va += PAGE_SIZE; 1222 } 1223 1224 /* 1225 * Allocate virtual address space for the message buffer. 1226 */ 1227 pa = msgbuf_phys = moea64_bootstrap_alloc(msgbufsize, PAGE_SIZE); 1228 msgbufp = (struct msgbuf *)virtual_avail; 1229 va = virtual_avail; 1230 virtual_avail += round_page(msgbufsize); 1231 while (va < virtual_avail) { 1232 moea64_kenter(va, pa); 1233 pa += PAGE_SIZE; 1234 va += PAGE_SIZE; 1235 } 1236 1237 /* 1238 * Allocate virtual address space for the dynamic percpu area. 1239 */ 1240 pa = moea64_bootstrap_alloc(DPCPU_SIZE, PAGE_SIZE); 1241 dpcpu = (void *)virtual_avail; 1242 va = virtual_avail; 1243 virtual_avail += DPCPU_SIZE; 1244 while (va < virtual_avail) { 1245 moea64_kenter(va, pa); 1246 pa += PAGE_SIZE; 1247 va += PAGE_SIZE; 1248 } 1249 dpcpu_init(dpcpu, curcpu); 1250 1251 crashdumpmap = (caddr_t)virtual_avail; 1252 virtual_avail += MAXDUMPPGS * PAGE_SIZE; 1253 1254 /* 1255 * Allocate some things for page zeroing. We put this directly 1256 * in the page table and use MOEA64_PTE_REPLACE to avoid any 1257 * of the PVO book-keeping or other parts of the VM system 1258 * from even knowing that this hack exists. 1259 */ 1260 1261 if (!hw_direct_map) { 1262 mtx_init(&moea64_scratchpage_mtx, "pvo zero page", NULL, 1263 MTX_DEF); 1264 for (i = 0; i < 2; i++) { 1265 moea64_scratchpage_va[i] = (virtual_end+1) - PAGE_SIZE; 1266 virtual_end -= PAGE_SIZE; 1267 1268 moea64_kenter(moea64_scratchpage_va[i], 0); 1269 1270 PMAP_LOCK(kernel_pmap); 1271 moea64_scratchpage_pvo[i] = moea64_pvo_find_va( 1272 kernel_pmap, (vm_offset_t)moea64_scratchpage_va[i]); 1273 PMAP_UNLOCK(kernel_pmap); 1274 } 1275 } 1276 1277 numa_mem_regions(&numa_pregions, &numapregions_sz); 1278} 1279 1280static void 1281moea64_pmap_init_qpages(void) 1282{ 1283 struct pcpu *pc; 1284 int i; 1285 1286 if (hw_direct_map) 1287 return; 1288 1289 CPU_FOREACH(i) { 1290 pc = pcpu_find(i); 1291 pc->pc_qmap_addr = kva_alloc(PAGE_SIZE); 1292 if (pc->pc_qmap_addr == 0) 1293 panic("pmap_init_qpages: unable to allocate KVA"); 1294 PMAP_LOCK(kernel_pmap); 1295 pc->pc_aim.qmap_pvo = 1296 moea64_pvo_find_va(kernel_pmap, pc->pc_qmap_addr); 1297 PMAP_UNLOCK(kernel_pmap); 1298 mtx_init(&pc->pc_aim.qmap_lock, "qmap lock", NULL, MTX_DEF); 1299 } 1300} 1301 1302SYSINIT(qpages_init, SI_SUB_CPU, SI_ORDER_ANY, moea64_pmap_init_qpages, NULL); 1303 1304/* 1305 * Activate a user pmap. This mostly involves setting some non-CPU 1306 * state. 1307 */ 1308void 1309moea64_activate(struct thread *td) 1310{ 1311 pmap_t pm; 1312 1313 pm = &td->td_proc->p_vmspace->vm_pmap; 1314 CPU_SET(PCPU_GET(cpuid), &pm->pm_active); 1315 1316 #ifdef __powerpc64__ 1317 PCPU_SET(aim.userslb, pm->pm_slb); 1318 __asm __volatile("slbmte %0, %1; isync" :: 1319 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE)); 1320 #else 1321 PCPU_SET(curpmap, pm->pmap_phys); 1322 mtsrin(USER_SR << ADDR_SR_SHFT, td->td_pcb->pcb_cpu.aim.usr_vsid); 1323 #endif 1324} 1325 1326void 1327moea64_deactivate(struct thread *td) 1328{ 1329 pmap_t pm; 1330 1331 __asm __volatile("isync; slbie %0" :: "r"(USER_ADDR)); 1332 1333 pm = &td->td_proc->p_vmspace->vm_pmap; 1334 CPU_CLR(PCPU_GET(cpuid), &pm->pm_active); 1335 #ifdef __powerpc64__ 1336 PCPU_SET(aim.userslb, NULL); 1337 #else 1338 PCPU_SET(curpmap, NULL); 1339 #endif 1340} 1341 1342void 1343moea64_unwire(pmap_t pm, vm_offset_t sva, vm_offset_t eva) 1344{ 1345 struct pvo_entry key, *pvo; 1346 vm_page_t m; 1347 int64_t refchg; 1348 1349 key.pvo_vaddr = sva; 1350 PMAP_LOCK(pm); 1351 for (pvo = RB_NFIND(pvo_tree, &pm->pmap_pvo, &key); 1352 pvo != NULL && PVO_VADDR(pvo) < eva; 1353 pvo = RB_NEXT(pvo_tree, &pm->pmap_pvo, pvo)) { 1354 if (PVO_IS_SP(pvo)) { 1355 if (moea64_sp_pvo_in_range(pvo, sva, eva)) { 1356 pvo = moea64_sp_unwire(pvo); 1357 continue; 1358 } else { 1359 CTR1(KTR_PMAP, "%s: demote before unwire", 1360 __func__); 1361 moea64_sp_demote(pvo); 1362 } 1363 } 1364 1365 if ((pvo->pvo_vaddr & PVO_WIRED) == 0) 1366 panic("moea64_unwire: pvo %p is missing PVO_WIRED", 1367 pvo); 1368 pvo->pvo_vaddr &= ~PVO_WIRED; 1369 refchg = moea64_pte_replace(pvo, 0 /* No invalidation */); 1370 if ((pvo->pvo_vaddr & PVO_MANAGED) && 1371 (pvo->pvo_pte.prot & VM_PROT_WRITE)) { 1372 if (refchg < 0) 1373 refchg = LPTE_CHG; 1374 m = PHYS_TO_VM_PAGE(PVO_PADDR(pvo)); 1375 1376 refchg |= atomic_readandclear_32(&m->md.mdpg_attrs); 1377 if (refchg & LPTE_CHG) 1378 vm_page_dirty(m); 1379 if (refchg & LPTE_REF) 1380 vm_page_aflag_set(m, PGA_REFERENCED); 1381 } 1382 pm->pm_stats.wired_count--; 1383 } 1384 PMAP_UNLOCK(pm); 1385} 1386 1387static int 1388moea64_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *pap) 1389{ 1390 struct pvo_entry *pvo; 1391 vm_paddr_t pa; 1392 vm_page_t m; 1393 int val; 1394 bool managed; 1395 1396 PMAP_LOCK(pmap); 1397 1398 pvo = moea64_pvo_find_va(pmap, addr); 1399 if (pvo != NULL) { 1400 pa = PVO_PADDR(pvo); 1401 m = PHYS_TO_VM_PAGE(pa); 1402 managed = (pvo->pvo_vaddr & PVO_MANAGED) == PVO_MANAGED; 1403 if (PVO_IS_SP(pvo)) 1404 val = MINCORE_INCORE | MINCORE_PSIND(1); 1405 else 1406 val = MINCORE_INCORE; 1407 } else { 1408 PMAP_UNLOCK(pmap); 1409 return (0); 1410 } 1411 1412 PMAP_UNLOCK(pmap); 1413 1414 if (m == NULL) 1415 return (0); 1416 1417 if (managed) { 1418 if (moea64_is_modified(m)) 1419 val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER; 1420 1421 if (moea64_is_referenced(m)) 1422 val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER; 1423 } 1424 1425 if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) != 1426 (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) && 1427 managed) { 1428 *pap = pa; 1429 } 1430 1431 return (val); 1432} 1433 1434/* 1435 * This goes through and sets the physical address of our 1436 * special scratch PTE to the PA we want to zero or copy. Because 1437 * of locking issues (this can get called in pvo_enter() by 1438 * the UMA allocator), we can't use most other utility functions here 1439 */ 1440 1441static __inline 1442void moea64_set_scratchpage_pa(int which, vm_paddr_t pa) 1443{ 1444 struct pvo_entry *pvo; 1445 1446 KASSERT(!hw_direct_map, ("Using OEA64 scratchpage with a direct map!")); 1447 mtx_assert(&moea64_scratchpage_mtx, MA_OWNED); 1448 1449 pvo = moea64_scratchpage_pvo[which]; 1450 PMAP_LOCK(pvo->pvo_pmap); 1451 pvo->pvo_pte.pa = 1452 moea64_calc_wimg(pa, VM_MEMATTR_DEFAULT) | (uint64_t)pa; 1453 moea64_pte_replace(pvo, MOEA64_PTE_INVALIDATE); 1454 PMAP_UNLOCK(pvo->pvo_pmap); 1455 isync(); 1456} 1457 1458void 1459moea64_copy_page(vm_page_t msrc, vm_page_t mdst) 1460{ 1461 mtx_lock(&moea64_scratchpage_mtx); 1462 1463 moea64_set_scratchpage_pa(0, VM_PAGE_TO_PHYS(msrc)); 1464 moea64_set_scratchpage_pa(1, VM_PAGE_TO_PHYS(mdst)); 1465 1466 bcopy((void *)moea64_scratchpage_va[0], 1467 (void *)moea64_scratchpage_va[1], PAGE_SIZE); 1468 1469 mtx_unlock(&moea64_scratchpage_mtx); 1470} 1471 1472void 1473moea64_copy_page_dmap(vm_page_t msrc, vm_page_t mdst) 1474{ 1475 vm_offset_t dst; 1476 vm_offset_t src; 1477 1478 dst = VM_PAGE_TO_PHYS(mdst); 1479 src = VM_PAGE_TO_PHYS(msrc); 1480 1481 bcopy((void *)PHYS_TO_DMAP(src), (void *)PHYS_TO_DMAP(dst), 1482 PAGE_SIZE); 1483} 1484 1485inline void 1486moea64_copy_pages_dmap(vm_page_t *ma, vm_offset_t a_offset, 1487 vm_page_t *mb, vm_offset_t b_offset, int xfersize) 1488{ 1489 void *a_cp, *b_cp; 1490 vm_offset_t a_pg_offset, b_pg_offset; 1491 int cnt; 1492 1493 while (xfersize > 0) { 1494 a_pg_offset = a_offset & PAGE_MASK; 1495 cnt = min(xfersize, PAGE_SIZE - a_pg_offset); 1496 a_cp = (char *)(uintptr_t)PHYS_TO_DMAP( 1497 VM_PAGE_TO_PHYS(ma[a_offset >> PAGE_SHIFT])) + 1498 a_pg_offset; 1499 b_pg_offset = b_offset & PAGE_MASK; 1500 cnt = min(cnt, PAGE_SIZE - b_pg_offset); 1501 b_cp = (char *)(uintptr_t)PHYS_TO_DMAP( 1502 VM_PAGE_TO_PHYS(mb[b_offset >> PAGE_SHIFT])) + 1503 b_pg_offset; 1504 bcopy(a_cp, b_cp, cnt); 1505 a_offset += cnt; 1506 b_offset += cnt; 1507 xfersize -= cnt; 1508 } 1509} 1510 1511void 1512moea64_copy_pages(vm_page_t *ma, vm_offset_t a_offset, 1513 vm_page_t *mb, vm_offset_t b_offset, int xfersize) 1514{ 1515 void *a_cp, *b_cp; 1516 vm_offset_t a_pg_offset, b_pg_offset; 1517 int cnt; 1518 1519 mtx_lock(&moea64_scratchpage_mtx); 1520 while (xfersize > 0) { 1521 a_pg_offset = a_offset & PAGE_MASK; 1522 cnt = min(xfersize, PAGE_SIZE - a_pg_offset); 1523 moea64_set_scratchpage_pa(0, 1524 VM_PAGE_TO_PHYS(ma[a_offset >> PAGE_SHIFT])); 1525 a_cp = (char *)moea64_scratchpage_va[0] + a_pg_offset; 1526 b_pg_offset = b_offset & PAGE_MASK; 1527 cnt = min(cnt, PAGE_SIZE - b_pg_offset); 1528 moea64_set_scratchpage_pa(1, 1529 VM_PAGE_TO_PHYS(mb[b_offset >> PAGE_SHIFT])); 1530 b_cp = (char *)moea64_scratchpage_va[1] + b_pg_offset; 1531 bcopy(a_cp, b_cp, cnt); 1532 a_offset += cnt; 1533 b_offset += cnt; 1534 xfersize -= cnt; 1535 } 1536 mtx_unlock(&moea64_scratchpage_mtx); 1537} 1538 1539void 1540moea64_zero_page_area(vm_page_t m, int off, int size) 1541{ 1542 vm_paddr_t pa = VM_PAGE_TO_PHYS(m); 1543 1544 if (size + off > PAGE_SIZE) 1545 panic("moea64_zero_page: size + off > PAGE_SIZE"); 1546 1547 if (hw_direct_map) { 1548 bzero((caddr_t)(uintptr_t)PHYS_TO_DMAP(pa) + off, size); 1549 } else { 1550 mtx_lock(&moea64_scratchpage_mtx); 1551 moea64_set_scratchpage_pa(0, pa); 1552 bzero((caddr_t)moea64_scratchpage_va[0] + off, size); 1553 mtx_unlock(&moea64_scratchpage_mtx); 1554 } 1555} 1556 1557/* 1558 * Zero a page of physical memory by temporarily mapping it 1559 */ 1560void 1561moea64_zero_page(vm_page_t m) 1562{ 1563 vm_paddr_t pa = VM_PAGE_TO_PHYS(m); 1564 vm_offset_t va, off; 1565 1566 mtx_lock(&moea64_scratchpage_mtx); 1567 1568 moea64_set_scratchpage_pa(0, pa); 1569 va = moea64_scratchpage_va[0]; 1570 1571 for (off = 0; off < PAGE_SIZE; off += cacheline_size) 1572 __asm __volatile("dcbz 0,%0" :: "r"(va + off)); 1573 1574 mtx_unlock(&moea64_scratchpage_mtx); 1575} 1576 1577void 1578moea64_zero_page_dmap(vm_page_t m) 1579{ 1580 vm_paddr_t pa = VM_PAGE_TO_PHYS(m); 1581 vm_offset_t va, off; 1582 1583 va = PHYS_TO_DMAP(pa); 1584 for (off = 0; off < PAGE_SIZE; off += cacheline_size) 1585 __asm __volatile("dcbz 0,%0" :: "r"(va + off)); 1586} 1587 1588vm_offset_t 1589moea64_quick_enter_page(vm_page_t m) 1590{ 1591 struct pvo_entry *pvo; 1592 vm_paddr_t pa = VM_PAGE_TO_PHYS(m); 1593 1594 /* 1595 * MOEA64_PTE_REPLACE does some locking, so we can't just grab 1596 * a critical section and access the PCPU data like on i386. 1597 * Instead, pin the thread and grab the PCPU lock to prevent 1598 * a preempting thread from using the same PCPU data. 1599 */ 1600 sched_pin(); 1601 1602 mtx_assert(PCPU_PTR(aim.qmap_lock), MA_NOTOWNED); 1603 pvo = PCPU_GET(aim.qmap_pvo); 1604 1605 mtx_lock(PCPU_PTR(aim.qmap_lock)); 1606 pvo->pvo_pte.pa = moea64_calc_wimg(pa, pmap_page_get_memattr(m)) | 1607 (uint64_t)pa; 1608 moea64_pte_replace(pvo, MOEA64_PTE_INVALIDATE); 1609 isync(); 1610 1611 return (PCPU_GET(qmap_addr)); 1612} 1613 1614vm_offset_t 1615moea64_quick_enter_page_dmap(vm_page_t m) 1616{ 1617 1618 return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m))); 1619} 1620 1621void 1622moea64_quick_remove_page(vm_offset_t addr) 1623{ 1624 1625 mtx_assert(PCPU_PTR(aim.qmap_lock), MA_OWNED); 1626 KASSERT(PCPU_GET(qmap_addr) == addr, 1627 ("moea64_quick_remove_page: invalid address")); 1628 mtx_unlock(PCPU_PTR(aim.qmap_lock)); 1629 sched_unpin(); 1630} 1631 1632bool 1633moea64_page_is_mapped(vm_page_t m) 1634{ 1635 return (!LIST_EMPTY(&(m)->md.mdpg_pvoh)); 1636} 1637 1638/* 1639 * Map the given physical page at the specified virtual address in the 1640 * target pmap with the protection requested. If specified the page 1641 * will be wired down. 1642 */ 1643 1644int 1645moea64_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, 1646 vm_prot_t prot, u_int flags, int8_t psind) 1647{ 1648 struct pvo_entry *pvo, *oldpvo, *tpvo; 1649 struct pvo_head *pvo_head; 1650 uint64_t pte_lo; 1651 int error; 1652 vm_paddr_t pa; 1653 1654 if ((m->oflags & VPO_UNMANAGED) == 0) { 1655 if ((flags & PMAP_ENTER_QUICK_LOCKED) == 0) 1656 VM_PAGE_OBJECT_BUSY_ASSERT(m); 1657 else 1658 VM_OBJECT_ASSERT_LOCKED(m->object); 1659 } 1660 1661 if (psind > 0) 1662 return (moea64_sp_enter(pmap, va, m, prot, flags, psind)); 1663 1664 pvo = alloc_pvo_entry(0); 1665 if (pvo == NULL) 1666 return (KERN_RESOURCE_SHORTAGE); 1667 pvo->pvo_pmap = NULL; /* to be filled in later */ 1668 pvo->pvo_pte.prot = prot; 1669 1670 pa = VM_PAGE_TO_PHYS(m); 1671 pte_lo = moea64_calc_wimg(pa, pmap_page_get_memattr(m)); 1672 pvo->pvo_pte.pa = pa | pte_lo; 1673 1674 if ((flags & PMAP_ENTER_WIRED) != 0) 1675 pvo->pvo_vaddr |= PVO_WIRED; 1676 1677 if ((m->oflags & VPO_UNMANAGED) != 0 || !moea64_initialized) { 1678 pvo_head = NULL; 1679 } else { 1680 pvo_head = &m->md.mdpg_pvoh; 1681 pvo->pvo_vaddr |= PVO_MANAGED; 1682 } 1683 1684 PV_LOCK(pa); 1685 PMAP_LOCK(pmap); 1686 if (pvo->pvo_pmap == NULL) 1687 init_pvo_entry(pvo, pmap, va); 1688 1689 if (moea64_ps_enabled(pmap) && 1690 (tpvo = moea64_pvo_find_va(pmap, va & ~HPT_SP_MASK)) != NULL && 1691 PVO_IS_SP(tpvo)) { 1692 /* Demote SP before entering a regular page */ 1693 CTR2(KTR_PMAP, "%s: demote before enter: va=%#jx", 1694 __func__, (uintmax_t)va); 1695 moea64_sp_demote_aligned(tpvo); 1696 } 1697 1698 if (prot & VM_PROT_WRITE) 1699 if (pmap_bootstrapped && 1700 (m->oflags & VPO_UNMANAGED) == 0) 1701 vm_page_aflag_set(m, PGA_WRITEABLE); 1702 1703 error = moea64_pvo_enter(pvo, pvo_head, &oldpvo); 1704 if (error == EEXIST) { 1705 if (oldpvo->pvo_vaddr == pvo->pvo_vaddr && 1706 oldpvo->pvo_pte.pa == pvo->pvo_pte.pa && 1707 oldpvo->pvo_pte.prot == prot) { 1708 /* Identical mapping already exists */ 1709 error = 0; 1710 1711 /* If not in page table, reinsert it */ 1712 if (moea64_pte_synch(oldpvo) < 0) { 1713 STAT_MOEA64(moea64_pte_overflow--); 1714 moea64_pte_insert(oldpvo); 1715 } 1716 1717 /* Then just clean up and go home */ 1718 PMAP_UNLOCK(pmap); 1719 PV_UNLOCK(pa); 1720 free_pvo_entry(pvo); 1721 pvo = NULL; 1722 goto out; 1723 } else { 1724 /* Otherwise, need to kill it first */ 1725 KASSERT(oldpvo->pvo_pmap == pmap, ("pmap of old " 1726 "mapping does not match new mapping")); 1727 moea64_pvo_remove_from_pmap(oldpvo); 1728 moea64_pvo_enter(pvo, pvo_head, NULL); 1729 } 1730 } 1731 PMAP_UNLOCK(pmap); 1732 PV_UNLOCK(pa); 1733 1734 /* Free any dead pages */ 1735 if (error == EEXIST) { 1736 moea64_pvo_remove_from_page(oldpvo); 1737 free_pvo_entry(oldpvo); 1738 } 1739 1740out: 1741 /* 1742 * Flush the page from the instruction cache if this page is 1743 * mapped executable and cacheable. 1744 */ 1745 if (pmap != kernel_pmap && (m->a.flags & PGA_EXECUTABLE) == 0 && 1746 (pte_lo & (LPTE_I | LPTE_G | LPTE_NOEXEC)) == 0) { 1747 vm_page_aflag_set(m, PGA_EXECUTABLE); 1748 moea64_syncicache(pmap, va, pa, PAGE_SIZE); 1749 } 1750 1751#if VM_NRESERVLEVEL > 0 1752 /* 1753 * Try to promote pages. 1754 * 1755 * If the VA of the entered page is not aligned with its PA, 1756 * don't try page promotion as it is not possible. 1757 * This reduces the number of promotion failures dramatically. 1758 * 1759 * Ignore VM_PROT_NO_PROMOTE unless PMAP_ENTER_QUICK_LOCKED. 1760 */ 1761 if (moea64_ps_enabled(pmap) && pmap != kernel_pmap && pvo != NULL && 1762 (pvo->pvo_vaddr & PVO_MANAGED) != 0 && 1763 (va & HPT_SP_MASK) == (pa & HPT_SP_MASK) && 1764 ((prot & VM_PROT_NO_PROMOTE) == 0 || 1765 (flags & PMAP_ENTER_QUICK_LOCKED) == 0) && 1766 (m->flags & PG_FICTITIOUS) == 0 && 1767 vm_reserv_level_iffullpop(m) == 0) 1768 moea64_sp_promote(pmap, va, m); 1769#endif 1770 1771 return (KERN_SUCCESS); 1772} 1773 1774static void 1775moea64_syncicache(pmap_t pmap, vm_offset_t va, vm_paddr_t pa, 1776 vm_size_t sz) 1777{ 1778 1779 /* 1780 * This is much trickier than on older systems because 1781 * we can't sync the icache on physical addresses directly 1782 * without a direct map. Instead we check a couple of cases 1783 * where the memory is already mapped in and, failing that, 1784 * use the same trick we use for page zeroing to create 1785 * a temporary mapping for this physical address. 1786 */ 1787 1788 if (!pmap_bootstrapped) { 1789 /* 1790 * If PMAP is not bootstrapped, we are likely to be 1791 * in real mode. 1792 */ 1793 __syncicache((void *)(uintptr_t)pa, sz); 1794 } else if (pmap == kernel_pmap) { 1795 __syncicache((void *)va, sz); 1796 } else if (hw_direct_map) { 1797 __syncicache((void *)(uintptr_t)PHYS_TO_DMAP(pa), sz); 1798 } else { 1799 /* Use the scratch page to set up a temp mapping */ 1800 1801 mtx_lock(&moea64_scratchpage_mtx); 1802 1803 moea64_set_scratchpage_pa(1, pa & ~ADDR_POFF); 1804 __syncicache((void *)(moea64_scratchpage_va[1] + 1805 (va & ADDR_POFF)), sz); 1806 1807 mtx_unlock(&moea64_scratchpage_mtx); 1808 } 1809} 1810 1811/* 1812 * Maps a sequence of resident pages belonging to the same object. 1813 * The sequence begins with the given page m_start. This page is 1814 * mapped at the given virtual address start. Each subsequent page is 1815 * mapped at a virtual address that is offset from start by the same 1816 * amount as the page is offset from m_start within the object. The 1817 * last page in the sequence is the page with the largest offset from 1818 * m_start that can be mapped at a virtual address less than the given 1819 * virtual address end. Not every virtual page between start and end 1820 * is mapped; only those for which a resident page exists with the 1821 * corresponding offset from m_start are mapped. 1822 */ 1823void 1824moea64_enter_object(pmap_t pm, vm_offset_t start, vm_offset_t end, 1825 vm_page_t m_start, vm_prot_t prot) 1826{ 1827 vm_page_t m; 1828 vm_pindex_t diff, psize; 1829 vm_offset_t va; 1830 int8_t psind; 1831 1832 VM_OBJECT_ASSERT_LOCKED(m_start->object); 1833 1834 psize = atop(end - start); 1835 m = m_start; 1836 while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) { 1837 va = start + ptoa(diff); 1838 if ((va & HPT_SP_MASK) == 0 && va + HPT_SP_SIZE <= end && 1839 m->psind == 1 && moea64_ps_enabled(pm)) 1840 psind = 1; 1841 else 1842 psind = 0; 1843 moea64_enter(pm, va, m, prot & 1844 (VM_PROT_READ | VM_PROT_EXECUTE), 1845 PMAP_ENTER_NOSLEEP | PMAP_ENTER_QUICK_LOCKED, psind); 1846 if (psind == 1) 1847 m = &m[HPT_SP_SIZE / PAGE_SIZE - 1]; 1848 m = TAILQ_NEXT(m, listq); 1849 } 1850} 1851 1852void 1853moea64_enter_quick(pmap_t pm, vm_offset_t va, vm_page_t m, 1854 vm_prot_t prot) 1855{ 1856 1857 moea64_enter(pm, va, m, prot & (VM_PROT_READ | VM_PROT_EXECUTE | 1858 VM_PROT_NO_PROMOTE), PMAP_ENTER_NOSLEEP | PMAP_ENTER_QUICK_LOCKED, 1859 0); 1860} 1861 1862vm_paddr_t 1863moea64_extract(pmap_t pm, vm_offset_t va) 1864{ 1865 struct pvo_entry *pvo; 1866 vm_paddr_t pa; 1867 1868 PMAP_LOCK(pm); 1869 pvo = moea64_pvo_find_va(pm, va); 1870 if (pvo == NULL) 1871 pa = 0; 1872 else 1873 pa = PVO_PADDR(pvo) | (va - PVO_VADDR(pvo)); 1874 PMAP_UNLOCK(pm); 1875 1876 return (pa); 1877} 1878 1879/* 1880 * Atomically extract and hold the physical page with the given 1881 * pmap and virtual address pair if that mapping permits the given 1882 * protection. 1883 */ 1884vm_page_t 1885moea64_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) 1886{ 1887 struct pvo_entry *pvo; 1888 vm_page_t m; 1889 1890 m = NULL; 1891 PMAP_LOCK(pmap); 1892 pvo = moea64_pvo_find_va(pmap, va & ~ADDR_POFF); 1893 if (pvo != NULL && (pvo->pvo_pte.prot & prot) == prot) { 1894 m = PHYS_TO_VM_PAGE(PVO_PADDR(pvo)); 1895 if (!vm_page_wire_mapped(m)) 1896 m = NULL; 1897 } 1898 PMAP_UNLOCK(pmap); 1899 return (m); 1900} 1901 1902static void * 1903moea64_uma_page_alloc(uma_zone_t zone, vm_size_t bytes, int domain, 1904 uint8_t *flags, int wait) 1905{ 1906 struct pvo_entry *pvo; 1907 vm_offset_t va; 1908 vm_page_t m; 1909 int needed_lock; 1910 1911 /* 1912 * This entire routine is a horrible hack to avoid bothering kmem 1913 * for new KVA addresses. Because this can get called from inside 1914 * kmem allocation routines, calling kmem for a new address here 1915 * can lead to multiply locking non-recursive mutexes. 1916 */ 1917 1918 *flags = UMA_SLAB_PRIV; 1919 needed_lock = !PMAP_LOCKED(kernel_pmap); 1920 1921 m = vm_page_alloc_noobj_domain(domain, malloc2vm_flags(wait) | 1922 VM_ALLOC_WIRED); 1923 if (m == NULL) 1924 return (NULL); 1925 1926 va = VM_PAGE_TO_PHYS(m); 1927 1928 pvo = alloc_pvo_entry(1 /* bootstrap */); 1929 1930 pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE; 1931 pvo->pvo_pte.pa = VM_PAGE_TO_PHYS(m) | LPTE_M; 1932 1933 if (needed_lock) 1934 PMAP_LOCK(kernel_pmap); 1935 1936 init_pvo_entry(pvo, kernel_pmap, va); 1937 pvo->pvo_vaddr |= PVO_WIRED; 1938 1939 moea64_pvo_enter(pvo, NULL, NULL); 1940 1941 if (needed_lock) 1942 PMAP_UNLOCK(kernel_pmap); 1943 1944 return (void *)va; 1945} 1946 1947extern int elf32_nxstack; 1948 1949void 1950moea64_init(void) 1951{ 1952 1953 CTR0(KTR_PMAP, "moea64_init"); 1954 1955 moea64_pvo_zone = uma_zcreate("UPVO entry", sizeof (struct pvo_entry), 1956 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 1957 UMA_ZONE_VM | UMA_ZONE_NOFREE); 1958 1959 /* 1960 * Are large page mappings enabled? 1961 * 1962 * While HPT superpages are not better tested, leave it disabled by 1963 * default. 1964 */ 1965 superpages_enabled = 0; 1966 TUNABLE_INT_FETCH("vm.pmap.superpages_enabled", &superpages_enabled); 1967 if (superpages_enabled) { 1968 KASSERT(MAXPAGESIZES > 1 && pagesizes[1] == 0, 1969 ("moea64_init: can't assign to pagesizes[1]")); 1970 1971 if (moea64_large_page_size == 0) { 1972 printf("mmu_oea64: HW does not support large pages. " 1973 "Disabling superpages...\n"); 1974 superpages_enabled = 0; 1975 } else if (!moea64_has_lp_4k_16m) { 1976 printf("mmu_oea64: " 1977 "HW does not support mixed 4KB/16MB page sizes. " 1978 "Disabling superpages...\n"); 1979 superpages_enabled = 0; 1980 } else 1981 pagesizes[1] = HPT_SP_SIZE; 1982 } 1983 1984 if (!hw_direct_map) { 1985 uma_zone_set_allocf(moea64_pvo_zone, moea64_uma_page_alloc); 1986 } 1987 1988#ifdef COMPAT_FREEBSD32 1989 elf32_nxstack = 1; 1990#endif 1991 1992 moea64_initialized = true; 1993} 1994 1995bool 1996moea64_is_referenced(vm_page_t m) 1997{ 1998 1999 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2000 ("moea64_is_referenced: page %p is not managed", m)); 2001 2002 return (moea64_query_bit(m, LPTE_REF)); 2003} 2004 2005bool 2006moea64_is_modified(vm_page_t m) 2007{ 2008 2009 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2010 ("moea64_is_modified: page %p is not managed", m)); 2011 2012 /* 2013 * If the page is not busied then this check is racy. 2014 */ 2015 if (!pmap_page_is_write_mapped(m)) 2016 return (false); 2017 2018 return (moea64_query_bit(m, LPTE_CHG)); 2019} 2020 2021bool 2022moea64_is_prefaultable(pmap_t pmap, vm_offset_t va) 2023{ 2024 struct pvo_entry *pvo; 2025 bool rv = true; 2026 2027 PMAP_LOCK(pmap); 2028 pvo = moea64_pvo_find_va(pmap, va & ~ADDR_POFF); 2029 if (pvo != NULL) 2030 rv = false; 2031 PMAP_UNLOCK(pmap); 2032 return (rv); 2033} 2034 2035void 2036moea64_clear_modify(vm_page_t m) 2037{ 2038 2039 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2040 ("moea64_clear_modify: page %p is not managed", m)); 2041 vm_page_assert_busied(m); 2042 2043 if (!pmap_page_is_write_mapped(m)) 2044 return; 2045 moea64_clear_bit(m, LPTE_CHG); 2046} 2047 2048/* 2049 * Clear the write and modified bits in each of the given page's mappings. 2050 */ 2051void 2052moea64_remove_write(vm_page_t m) 2053{ 2054 struct pvo_entry *pvo; 2055 int64_t refchg, ret; 2056 pmap_t pmap; 2057 2058 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2059 ("moea64_remove_write: page %p is not managed", m)); 2060 vm_page_assert_busied(m); 2061 2062 if (!pmap_page_is_write_mapped(m)) 2063 return; 2064 2065 powerpc_sync(); 2066 PV_PAGE_LOCK(m); 2067 refchg = 0; 2068 LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { 2069 pmap = pvo->pvo_pmap; 2070 PMAP_LOCK(pmap); 2071 if (!(pvo->pvo_vaddr & PVO_DEAD) && 2072 (pvo->pvo_pte.prot & VM_PROT_WRITE)) { 2073 if (PVO_IS_SP(pvo)) { 2074 CTR1(KTR_PMAP, "%s: demote before remwr", 2075 __func__); 2076 moea64_sp_demote(pvo); 2077 } 2078 pvo->pvo_pte.prot &= ~VM_PROT_WRITE; 2079 ret = moea64_pte_replace(pvo, MOEA64_PTE_PROT_UPDATE); 2080 if (ret < 0) 2081 ret = LPTE_CHG; 2082 refchg |= ret; 2083 if (pvo->pvo_pmap == kernel_pmap) 2084 isync(); 2085 } 2086 PMAP_UNLOCK(pmap); 2087 } 2088 if ((refchg | atomic_readandclear_32(&m->md.mdpg_attrs)) & LPTE_CHG) 2089 vm_page_dirty(m); 2090 vm_page_aflag_clear(m, PGA_WRITEABLE); 2091 PV_PAGE_UNLOCK(m); 2092} 2093 2094/* 2095 * moea64_ts_referenced: 2096 * 2097 * Return a count of reference bits for a page, clearing those bits. 2098 * It is not necessary for every reference bit to be cleared, but it 2099 * is necessary that 0 only be returned when there are truly no 2100 * reference bits set. 2101 * 2102 * XXX: The exact number of bits to check and clear is a matter that 2103 * should be tested and standardized at some point in the future for 2104 * optimal aging of shared pages. 2105 */ 2106int 2107moea64_ts_referenced(vm_page_t m) 2108{ 2109 2110 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2111 ("moea64_ts_referenced: page %p is not managed", m)); 2112 return (moea64_clear_bit(m, LPTE_REF)); 2113} 2114 2115/* 2116 * Modify the WIMG settings of all mappings for a page. 2117 */ 2118void 2119moea64_page_set_memattr(vm_page_t m, vm_memattr_t ma) 2120{ 2121 struct pvo_entry *pvo; 2122 int64_t refchg; 2123 pmap_t pmap; 2124 uint64_t lo; 2125 2126 CTR3(KTR_PMAP, "%s: pa=%#jx, ma=%#x", 2127 __func__, (uintmax_t)VM_PAGE_TO_PHYS(m), ma); 2128 2129 if ((m->oflags & VPO_UNMANAGED) != 0) { 2130 m->md.mdpg_cache_attrs = ma; 2131 return; 2132 } 2133 2134 lo = moea64_calc_wimg(VM_PAGE_TO_PHYS(m), ma); 2135 2136 PV_PAGE_LOCK(m); 2137 LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { 2138 pmap = pvo->pvo_pmap; 2139 PMAP_LOCK(pmap); 2140 if (!(pvo->pvo_vaddr & PVO_DEAD)) { 2141 if (PVO_IS_SP(pvo)) { 2142 CTR1(KTR_PMAP, 2143 "%s: demote before set_memattr", __func__); 2144 moea64_sp_demote(pvo); 2145 } 2146 pvo->pvo_pte.pa &= ~LPTE_WIMG; 2147 pvo->pvo_pte.pa |= lo; 2148 refchg = moea64_pte_replace(pvo, MOEA64_PTE_INVALIDATE); 2149 if (refchg < 0) 2150 refchg = (pvo->pvo_pte.prot & VM_PROT_WRITE) ? 2151 LPTE_CHG : 0; 2152 if ((pvo->pvo_vaddr & PVO_MANAGED) && 2153 (pvo->pvo_pte.prot & VM_PROT_WRITE)) { 2154 refchg |= 2155 atomic_readandclear_32(&m->md.mdpg_attrs); 2156 if (refchg & LPTE_CHG) 2157 vm_page_dirty(m); 2158 if (refchg & LPTE_REF) 2159 vm_page_aflag_set(m, PGA_REFERENCED); 2160 } 2161 if (pvo->pvo_pmap == kernel_pmap) 2162 isync(); 2163 } 2164 PMAP_UNLOCK(pmap); 2165 } 2166 m->md.mdpg_cache_attrs = ma; 2167 PV_PAGE_UNLOCK(m); 2168} 2169 2170/* 2171 * Map a wired page into kernel virtual address space. 2172 */ 2173void 2174moea64_kenter_attr(vm_offset_t va, vm_paddr_t pa, vm_memattr_t ma) 2175{ 2176 int error; 2177 struct pvo_entry *pvo, *oldpvo; 2178 2179 do { 2180 pvo = alloc_pvo_entry(0); 2181 if (pvo == NULL) 2182 vm_wait(NULL); 2183 } while (pvo == NULL); 2184 pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE; 2185 pvo->pvo_pte.pa = (pa & ~ADDR_POFF) | moea64_calc_wimg(pa, ma); 2186 pvo->pvo_vaddr |= PVO_WIRED; 2187 2188 PMAP_LOCK(kernel_pmap); 2189 oldpvo = moea64_pvo_find_va(kernel_pmap, va); 2190 if (oldpvo != NULL) 2191 moea64_pvo_remove_from_pmap(oldpvo); 2192 init_pvo_entry(pvo, kernel_pmap, va); 2193 error = moea64_pvo_enter(pvo, NULL, NULL); 2194 PMAP_UNLOCK(kernel_pmap); 2195 2196 /* Free any dead pages */ 2197 if (oldpvo != NULL) { 2198 moea64_pvo_remove_from_page(oldpvo); 2199 free_pvo_entry(oldpvo); 2200 } 2201 2202 if (error != 0) 2203 panic("moea64_kenter: failed to enter va %#zx pa %#jx: %d", va, 2204 (uintmax_t)pa, error); 2205} 2206 2207void 2208moea64_kenter(vm_offset_t va, vm_paddr_t pa) 2209{ 2210 2211 moea64_kenter_attr(va, pa, VM_MEMATTR_DEFAULT); 2212} 2213 2214/* 2215 * Extract the physical page address associated with the given kernel virtual 2216 * address. 2217 */ 2218vm_paddr_t 2219moea64_kextract(vm_offset_t va) 2220{ 2221 struct pvo_entry *pvo; 2222 vm_paddr_t pa; 2223 2224 /* 2225 * Shortcut the direct-mapped case when applicable. We never put 2226 * anything but 1:1 (or 62-bit aliased) mappings below 2227 * VM_MIN_KERNEL_ADDRESS. 2228 */ 2229 if (va < VM_MIN_KERNEL_ADDRESS) 2230 return (va & ~DMAP_BASE_ADDRESS); 2231 2232 PMAP_LOCK(kernel_pmap); 2233 pvo = moea64_pvo_find_va(kernel_pmap, va); 2234 KASSERT(pvo != NULL, ("moea64_kextract: no addr found for %#" PRIxPTR, 2235 va)); 2236 pa = PVO_PADDR(pvo) | (va - PVO_VADDR(pvo)); 2237 PMAP_UNLOCK(kernel_pmap); 2238 return (pa); 2239} 2240 2241/* 2242 * Remove a wired page from kernel virtual address space. 2243 */ 2244void 2245moea64_kremove(vm_offset_t va) 2246{ 2247 moea64_remove(kernel_pmap, va, va + PAGE_SIZE); 2248} 2249 2250/* 2251 * Provide a kernel pointer corresponding to a given userland pointer. 2252 * The returned pointer is valid until the next time this function is 2253 * called in this thread. This is used internally in copyin/copyout. 2254 */ 2255static int 2256moea64_map_user_ptr(pmap_t pm, volatile const void *uaddr, 2257 void **kaddr, size_t ulen, size_t *klen) 2258{ 2259 size_t l; 2260#ifdef __powerpc64__ 2261 struct slb *slb; 2262#endif 2263 register_t slbv; 2264 2265 *kaddr = (char *)USER_ADDR + ((uintptr_t)uaddr & ~SEGMENT_MASK); 2266 l = ((char *)USER_ADDR + SEGMENT_LENGTH) - (char *)(*kaddr); 2267 if (l > ulen) 2268 l = ulen; 2269 if (klen) 2270 *klen = l; 2271 else if (l != ulen) 2272 return (EFAULT); 2273 2274#ifdef __powerpc64__ 2275 /* Try lockless look-up first */ 2276 slb = user_va_to_slb_entry(pm, (vm_offset_t)uaddr); 2277 2278 if (slb == NULL) { 2279 /* If it isn't there, we need to pre-fault the VSID */ 2280 PMAP_LOCK(pm); 2281 slbv = va_to_vsid(pm, (vm_offset_t)uaddr) << SLBV_VSID_SHIFT; 2282 PMAP_UNLOCK(pm); 2283 } else { 2284 slbv = slb->slbv; 2285 } 2286 2287 /* Mark segment no-execute */ 2288 slbv |= SLBV_N; 2289#else 2290 slbv = va_to_vsid(pm, (vm_offset_t)uaddr); 2291 2292 /* Mark segment no-execute */ 2293 slbv |= SR_N; 2294#endif 2295 2296 /* If we have already set this VSID, we can just return */ 2297 if (curthread->td_pcb->pcb_cpu.aim.usr_vsid == slbv) 2298 return (0); 2299 2300 __asm __volatile("isync"); 2301 curthread->td_pcb->pcb_cpu.aim.usr_segm = 2302 (uintptr_t)uaddr >> ADDR_SR_SHFT; 2303 curthread->td_pcb->pcb_cpu.aim.usr_vsid = slbv; 2304#ifdef __powerpc64__ 2305 __asm __volatile ("slbie %0; slbmte %1, %2; isync" :: 2306 "r"(USER_ADDR), "r"(slbv), "r"(USER_SLB_SLBE)); 2307#else 2308 __asm __volatile("mtsr %0,%1; isync" :: "n"(USER_SR), "r"(slbv)); 2309#endif 2310 2311 return (0); 2312} 2313 2314/* 2315 * Figure out where a given kernel pointer (usually in a fault) points 2316 * to from the VM's perspective, potentially remapping into userland's 2317 * address space. 2318 */ 2319static int 2320moea64_decode_kernel_ptr(vm_offset_t addr, int *is_user, 2321 vm_offset_t *decoded_addr) 2322{ 2323 vm_offset_t user_sr; 2324 2325 if ((addr >> ADDR_SR_SHFT) == (USER_ADDR >> ADDR_SR_SHFT)) { 2326 user_sr = curthread->td_pcb->pcb_cpu.aim.usr_segm; 2327 addr &= ADDR_PIDX | ADDR_POFF; 2328 addr |= user_sr << ADDR_SR_SHFT; 2329 *decoded_addr = addr; 2330 *is_user = 1; 2331 } else { 2332 *decoded_addr = addr; 2333 *is_user = 0; 2334 } 2335 2336 return (0); 2337} 2338 2339/* 2340 * Map a range of physical addresses into kernel virtual address space. 2341 * 2342 * The value passed in *virt is a suggested virtual address for the mapping. 2343 * Architectures which can support a direct-mapped physical to virtual region 2344 * can return the appropriate address within that region, leaving '*virt' 2345 * unchanged. Other architectures should map the pages starting at '*virt' and 2346 * update '*virt' with the first usable address after the mapped region. 2347 */ 2348vm_offset_t 2349moea64_map(vm_offset_t *virt, vm_paddr_t pa_start, 2350 vm_paddr_t pa_end, int prot) 2351{ 2352 vm_offset_t sva, va; 2353 2354 if (hw_direct_map) { 2355 /* 2356 * Check if every page in the region is covered by the direct 2357 * map. The direct map covers all of physical memory. Use 2358 * moea64_calc_wimg() as a shortcut to see if the page is in 2359 * physical memory as a way to see if the direct map covers it. 2360 */ 2361 for (va = pa_start; va < pa_end; va += PAGE_SIZE) 2362 if (moea64_calc_wimg(va, VM_MEMATTR_DEFAULT) != LPTE_M) 2363 break; 2364 if (va == pa_end) 2365 return (PHYS_TO_DMAP(pa_start)); 2366 } 2367 sva = *virt; 2368 va = sva; 2369 /* XXX respect prot argument */ 2370 for (; pa_start < pa_end; pa_start += PAGE_SIZE, va += PAGE_SIZE) 2371 moea64_kenter(va, pa_start); 2372 *virt = va; 2373 2374 return (sva); 2375} 2376 2377/* 2378 * Returns true if the pmap's pv is one of the first 2379 * 16 pvs linked to from this page. This count may 2380 * be changed upwards or downwards in the future; it 2381 * is only necessary that true be returned for a small 2382 * subset of pmaps for proper page aging. 2383 */ 2384bool 2385moea64_page_exists_quick(pmap_t pmap, vm_page_t m) 2386{ 2387 int loops; 2388 struct pvo_entry *pvo; 2389 bool rv; 2390 2391 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2392 ("moea64_page_exists_quick: page %p is not managed", m)); 2393 loops = 0; 2394 rv = false; 2395 PV_PAGE_LOCK(m); 2396 LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { 2397 if (!(pvo->pvo_vaddr & PVO_DEAD) && pvo->pvo_pmap == pmap) { 2398 rv = true; 2399 break; 2400 } 2401 if (++loops >= 16) 2402 break; 2403 } 2404 PV_PAGE_UNLOCK(m); 2405 return (rv); 2406} 2407 2408void 2409moea64_page_init(vm_page_t m) 2410{ 2411 2412 m->md.mdpg_attrs = 0; 2413 m->md.mdpg_cache_attrs = VM_MEMATTR_DEFAULT; 2414 LIST_INIT(&m->md.mdpg_pvoh); 2415} 2416 2417/* 2418 * Return the number of managed mappings to the given physical page 2419 * that are wired. 2420 */ 2421int 2422moea64_page_wired_mappings(vm_page_t m) 2423{ 2424 struct pvo_entry *pvo; 2425 int count; 2426 2427 count = 0; 2428 if ((m->oflags & VPO_UNMANAGED) != 0) 2429 return (count); 2430 PV_PAGE_LOCK(m); 2431 LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) 2432 if ((pvo->pvo_vaddr & (PVO_DEAD | PVO_WIRED)) == PVO_WIRED) 2433 count++; 2434 PV_PAGE_UNLOCK(m); 2435 return (count); 2436} 2437 2438static uintptr_t moea64_vsidcontext; 2439 2440uintptr_t 2441moea64_get_unique_vsid(void) { 2442 u_int entropy; 2443 register_t hash; 2444 uint32_t mask; 2445 int i; 2446 2447 entropy = 0; 2448 __asm __volatile("mftb %0" : "=r"(entropy)); 2449 2450 mtx_lock(&moea64_slb_mutex); 2451 for (i = 0; i < NVSIDS; i += VSID_NBPW) { 2452 u_int n; 2453 2454 /* 2455 * Create a new value by multiplying by a prime and adding in 2456 * entropy from the timebase register. This is to make the 2457 * VSID more random so that the PT hash function collides 2458 * less often. (Note that the prime casues gcc to do shifts 2459 * instead of a multiply.) 2460 */ 2461 moea64_vsidcontext = (moea64_vsidcontext * 0x1105) + entropy; 2462 hash = moea64_vsidcontext & (NVSIDS - 1); 2463 if (hash == 0) /* 0 is special, avoid it */ 2464 continue; 2465 n = hash >> 5; 2466 mask = 1 << (hash & (VSID_NBPW - 1)); 2467 hash = (moea64_vsidcontext & VSID_HASHMASK); 2468 if (moea64_vsid_bitmap[n] & mask) { /* collision? */ 2469 /* anything free in this bucket? */ 2470 if (moea64_vsid_bitmap[n] == 0xffffffff) { 2471 entropy = (moea64_vsidcontext >> 20); 2472 continue; 2473 } 2474 i = ffs(~moea64_vsid_bitmap[n]) - 1; 2475 mask = 1 << i; 2476 hash &= rounddown2(VSID_HASHMASK, VSID_NBPW); 2477 hash |= i; 2478 } 2479 if (hash == VSID_VRMA) /* also special, avoid this too */ 2480 continue; 2481 KASSERT(!(moea64_vsid_bitmap[n] & mask), 2482 ("Allocating in-use VSID %#zx\n", hash)); 2483 moea64_vsid_bitmap[n] |= mask; 2484 mtx_unlock(&moea64_slb_mutex); 2485 return (hash); 2486 } 2487 2488 mtx_unlock(&moea64_slb_mutex); 2489 panic("%s: out of segments",__func__); 2490} 2491 2492#ifdef __powerpc64__ 2493int 2494moea64_pinit(pmap_t pmap) 2495{ 2496 2497 RB_INIT(&pmap->pmap_pvo); 2498 2499 pmap->pm_slb_tree_root = slb_alloc_tree(); 2500 pmap->pm_slb = slb_alloc_user_cache(); 2501 pmap->pm_slb_len = 0; 2502 2503 return (1); 2504} 2505#else 2506int 2507moea64_pinit(pmap_t pmap) 2508{ 2509 int i; 2510 uint32_t hash; 2511 2512 RB_INIT(&pmap->pmap_pvo); 2513 2514 if (pmap_bootstrapped) 2515 pmap->pmap_phys = (pmap_t)moea64_kextract((vm_offset_t)pmap); 2516 else 2517 pmap->pmap_phys = pmap; 2518 2519 /* 2520 * Allocate some segment registers for this pmap. 2521 */ 2522 hash = moea64_get_unique_vsid(); 2523 2524 for (i = 0; i < 16; i++) 2525 pmap->pm_sr[i] = VSID_MAKE(i, hash); 2526 2527 KASSERT(pmap->pm_sr[0] != 0, ("moea64_pinit: pm_sr[0] = 0")); 2528 2529 return (1); 2530} 2531#endif 2532 2533/* 2534 * Initialize the pmap associated with process 0. 2535 */ 2536void 2537moea64_pinit0(pmap_t pm) 2538{ 2539 2540 PMAP_LOCK_INIT(pm); 2541 moea64_pinit(pm); 2542 bzero(&pm->pm_stats, sizeof(pm->pm_stats)); 2543} 2544 2545/* 2546 * Set the physical protection on the specified range of this map as requested. 2547 */ 2548static void 2549moea64_pvo_protect( pmap_t pm, struct pvo_entry *pvo, vm_prot_t prot) 2550{ 2551 struct vm_page *pg; 2552 vm_prot_t oldprot; 2553 int32_t refchg; 2554 2555 PMAP_LOCK_ASSERT(pm, MA_OWNED); 2556 2557 /* 2558 * Change the protection of the page. 2559 */ 2560 oldprot = pvo->pvo_pte.prot; 2561 pvo->pvo_pte.prot = prot; 2562 pg = PHYS_TO_VM_PAGE(PVO_PADDR(pvo)); 2563 2564 /* 2565 * If the PVO is in the page table, update mapping 2566 */ 2567 refchg = moea64_pte_replace(pvo, MOEA64_PTE_PROT_UPDATE); 2568 if (refchg < 0) 2569 refchg = (oldprot & VM_PROT_WRITE) ? LPTE_CHG : 0; 2570 2571 if (pm != kernel_pmap && pg != NULL && 2572 (pg->a.flags & PGA_EXECUTABLE) == 0 && 2573 (pvo->pvo_pte.pa & (LPTE_I | LPTE_G | LPTE_NOEXEC)) == 0) { 2574 if ((pg->oflags & VPO_UNMANAGED) == 0) 2575 vm_page_aflag_set(pg, PGA_EXECUTABLE); 2576 moea64_syncicache(pm, PVO_VADDR(pvo), 2577 PVO_PADDR(pvo), PAGE_SIZE); 2578 } 2579 2580 /* 2581 * Update vm about the REF/CHG bits if the page is managed and we have 2582 * removed write access. 2583 */ 2584 if (pg != NULL && (pvo->pvo_vaddr & PVO_MANAGED) && 2585 (oldprot & VM_PROT_WRITE)) { 2586 refchg |= atomic_readandclear_32(&pg->md.mdpg_attrs); 2587 if (refchg & LPTE_CHG) 2588 vm_page_dirty(pg); 2589 if (refchg & LPTE_REF) 2590 vm_page_aflag_set(pg, PGA_REFERENCED); 2591 } 2592} 2593 2594void 2595moea64_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, 2596 vm_prot_t prot) 2597{ 2598 struct pvo_entry *pvo, key; 2599 2600 CTR4(KTR_PMAP, "moea64_protect: pm=%p sva=%#x eva=%#x prot=%#x", pm, 2601 sva, eva, prot); 2602 2603 KASSERT(pm == &curproc->p_vmspace->vm_pmap || pm == kernel_pmap, 2604 ("moea64_protect: non current pmap")); 2605 2606 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 2607 moea64_remove(pm, sva, eva); 2608 return; 2609 } 2610 2611 PMAP_LOCK(pm); 2612 key.pvo_vaddr = sva; 2613 for (pvo = RB_NFIND(pvo_tree, &pm->pmap_pvo, &key); 2614 pvo != NULL && PVO_VADDR(pvo) < eva; 2615 pvo = RB_NEXT(pvo_tree, &pm->pmap_pvo, pvo)) { 2616 if (PVO_IS_SP(pvo)) { 2617 if (moea64_sp_pvo_in_range(pvo, sva, eva)) { 2618 pvo = moea64_sp_protect(pvo, prot); 2619 continue; 2620 } else { 2621 CTR1(KTR_PMAP, "%s: demote before protect", 2622 __func__); 2623 moea64_sp_demote(pvo); 2624 } 2625 } 2626 moea64_pvo_protect(pm, pvo, prot); 2627 } 2628 PMAP_UNLOCK(pm); 2629} 2630 2631/* 2632 * Map a list of wired pages into kernel virtual address space. This is 2633 * intended for temporary mappings which do not need page modification or 2634 * references recorded. Existing mappings in the region are overwritten. 2635 */ 2636void 2637moea64_qenter(vm_offset_t va, vm_page_t *m, int count) 2638{ 2639 while (count-- > 0) { 2640 moea64_kenter(va, VM_PAGE_TO_PHYS(*m)); 2641 va += PAGE_SIZE; 2642 m++; 2643 } 2644} 2645 2646/* 2647 * Remove page mappings from kernel virtual address space. Intended for 2648 * temporary mappings entered by moea64_qenter. 2649 */ 2650void 2651moea64_qremove(vm_offset_t va, int count) 2652{ 2653 while (count-- > 0) { 2654 moea64_kremove(va); 2655 va += PAGE_SIZE; 2656 } 2657} 2658 2659void 2660moea64_release_vsid(uint64_t vsid) 2661{ 2662 int idx, mask; 2663 2664 mtx_lock(&moea64_slb_mutex); 2665 idx = vsid & (NVSIDS-1); 2666 mask = 1 << (idx % VSID_NBPW); 2667 idx /= VSID_NBPW; 2668 KASSERT(moea64_vsid_bitmap[idx] & mask, 2669 ("Freeing unallocated VSID %#jx", vsid)); 2670 moea64_vsid_bitmap[idx] &= ~mask; 2671 mtx_unlock(&moea64_slb_mutex); 2672} 2673 2674void 2675moea64_release(pmap_t pmap) 2676{ 2677 2678 /* 2679 * Free segment registers' VSIDs 2680 */ 2681 #ifdef __powerpc64__ 2682 slb_free_tree(pmap); 2683 slb_free_user_cache(pmap->pm_slb); 2684 #else 2685 KASSERT(pmap->pm_sr[0] != 0, ("moea64_release: pm_sr[0] = 0")); 2686 2687 moea64_release_vsid(VSID_TO_HASH(pmap->pm_sr[0])); 2688 #endif 2689} 2690 2691/* 2692 * Remove all pages mapped by the specified pmap 2693 */ 2694void 2695moea64_remove_pages(pmap_t pm) 2696{ 2697 struct pvo_entry *pvo, *tpvo; 2698 struct pvo_dlist tofree; 2699 2700 SLIST_INIT(&tofree); 2701 2702 PMAP_LOCK(pm); 2703 RB_FOREACH_SAFE(pvo, pvo_tree, &pm->pmap_pvo, tpvo) { 2704 if (pvo->pvo_vaddr & PVO_WIRED) 2705 continue; 2706 2707 /* 2708 * For locking reasons, remove this from the page table and 2709 * pmap, but save delinking from the vm_page for a second 2710 * pass 2711 */ 2712 moea64_pvo_remove_from_pmap(pvo); 2713 SLIST_INSERT_HEAD(&tofree, pvo, pvo_dlink); 2714 } 2715 PMAP_UNLOCK(pm); 2716 2717 while (!SLIST_EMPTY(&tofree)) { 2718 pvo = SLIST_FIRST(&tofree); 2719 SLIST_REMOVE_HEAD(&tofree, pvo_dlink); 2720 moea64_pvo_remove_from_page(pvo); 2721 free_pvo_entry(pvo); 2722 } 2723} 2724 2725static void 2726moea64_remove_locked(pmap_t pm, vm_offset_t sva, vm_offset_t eva, 2727 struct pvo_dlist *tofree) 2728{ 2729 struct pvo_entry *pvo, *tpvo, key; 2730 2731 PMAP_LOCK_ASSERT(pm, MA_OWNED); 2732 2733 key.pvo_vaddr = sva; 2734 for (pvo = RB_NFIND(pvo_tree, &pm->pmap_pvo, &key); 2735 pvo != NULL && PVO_VADDR(pvo) < eva; pvo = tpvo) { 2736 if (PVO_IS_SP(pvo)) { 2737 if (moea64_sp_pvo_in_range(pvo, sva, eva)) { 2738 tpvo = moea64_sp_remove(pvo, tofree); 2739 continue; 2740 } else { 2741 CTR1(KTR_PMAP, "%s: demote before remove", 2742 __func__); 2743 moea64_sp_demote(pvo); 2744 } 2745 } 2746 tpvo = RB_NEXT(pvo_tree, &pm->pmap_pvo, pvo); 2747 2748 /* 2749 * For locking reasons, remove this from the page table and 2750 * pmap, but save delinking from the vm_page for a second 2751 * pass 2752 */ 2753 moea64_pvo_remove_from_pmap(pvo); 2754 SLIST_INSERT_HEAD(tofree, pvo, pvo_dlink); 2755 } 2756} 2757 2758/* 2759 * Remove the given range of addresses from the specified map. 2760 */ 2761void 2762moea64_remove(pmap_t pm, vm_offset_t sva, vm_offset_t eva) 2763{ 2764 struct pvo_entry *pvo; 2765 struct pvo_dlist tofree; 2766 2767 /* 2768 * Perform an unsynchronized read. This is, however, safe. 2769 */ 2770 if (pm->pm_stats.resident_count == 0) 2771 return; 2772 2773 SLIST_INIT(&tofree); 2774 PMAP_LOCK(pm); 2775 moea64_remove_locked(pm, sva, eva, &tofree); 2776 PMAP_UNLOCK(pm); 2777 2778 while (!SLIST_EMPTY(&tofree)) { 2779 pvo = SLIST_FIRST(&tofree); 2780 SLIST_REMOVE_HEAD(&tofree, pvo_dlink); 2781 moea64_pvo_remove_from_page(pvo); 2782 free_pvo_entry(pvo); 2783 } 2784} 2785 2786/* 2787 * Remove physical page from all pmaps in which it resides. moea64_pvo_remove() 2788 * will reflect changes in pte's back to the vm_page. 2789 */ 2790void 2791moea64_remove_all(vm_page_t m) 2792{ 2793 struct pvo_entry *pvo, *next_pvo; 2794 struct pvo_head freequeue; 2795 int wasdead; 2796 pmap_t pmap; 2797 2798 LIST_INIT(&freequeue); 2799 2800 PV_PAGE_LOCK(m); 2801 LIST_FOREACH_SAFE(pvo, vm_page_to_pvoh(m), pvo_vlink, next_pvo) { 2802 pmap = pvo->pvo_pmap; 2803 PMAP_LOCK(pmap); 2804 wasdead = (pvo->pvo_vaddr & PVO_DEAD); 2805 if (!wasdead) { 2806 if (PVO_IS_SP(pvo)) { 2807 CTR1(KTR_PMAP, "%s: demote before remove_all", 2808 __func__); 2809 moea64_sp_demote(pvo); 2810 } 2811 moea64_pvo_remove_from_pmap(pvo); 2812 } 2813 moea64_pvo_remove_from_page_locked(pvo, m); 2814 if (!wasdead) 2815 LIST_INSERT_HEAD(&freequeue, pvo, pvo_vlink); 2816 PMAP_UNLOCK(pmap); 2817 2818 } 2819 KASSERT(!pmap_page_is_mapped(m), ("Page still has mappings")); 2820 KASSERT((m->a.flags & PGA_WRITEABLE) == 0, ("Page still writable")); 2821 PV_PAGE_UNLOCK(m); 2822 2823 /* Clean up UMA allocations */ 2824 LIST_FOREACH_SAFE(pvo, &freequeue, pvo_vlink, next_pvo) 2825 free_pvo_entry(pvo); 2826} 2827 2828/* 2829 * Allocate a physical page of memory directly from the phys_avail map. 2830 * Can only be called from moea64_bootstrap before avail start and end are 2831 * calculated. 2832 */ 2833vm_offset_t 2834moea64_bootstrap_alloc(vm_size_t size, vm_size_t align) 2835{ 2836 vm_offset_t s, e; 2837 int i, j; 2838 2839 size = round_page(size); 2840 for (i = 0; phys_avail[i + 1] != 0; i += 2) { 2841 if (align != 0) 2842 s = roundup2(phys_avail[i], align); 2843 else 2844 s = phys_avail[i]; 2845 e = s + size; 2846 2847 if (s < phys_avail[i] || e > phys_avail[i + 1]) 2848 continue; 2849 2850 if (s + size > platform_real_maxaddr()) 2851 continue; 2852 2853 if (s == phys_avail[i]) { 2854 phys_avail[i] += size; 2855 } else if (e == phys_avail[i + 1]) { 2856 phys_avail[i + 1] -= size; 2857 } else { 2858 for (j = phys_avail_count * 2; j > i; j -= 2) { 2859 phys_avail[j] = phys_avail[j - 2]; 2860 phys_avail[j + 1] = phys_avail[j - 1]; 2861 } 2862 2863 phys_avail[i + 3] = phys_avail[i + 1]; 2864 phys_avail[i + 1] = s; 2865 phys_avail[i + 2] = e; 2866 phys_avail_count++; 2867 } 2868 2869 return (s); 2870 } 2871 panic("moea64_bootstrap_alloc: could not allocate memory"); 2872} 2873 2874static int 2875moea64_pvo_enter(struct pvo_entry *pvo, struct pvo_head *pvo_head, 2876 struct pvo_entry **oldpvop) 2877{ 2878 struct pvo_entry *old_pvo; 2879 int err; 2880 2881 PMAP_LOCK_ASSERT(pvo->pvo_pmap, MA_OWNED); 2882 2883 STAT_MOEA64(moea64_pvo_enter_calls++); 2884 2885 /* 2886 * Add to pmap list 2887 */ 2888 old_pvo = RB_INSERT(pvo_tree, &pvo->pvo_pmap->pmap_pvo, pvo); 2889 2890 if (old_pvo != NULL) { 2891 if (oldpvop != NULL) 2892 *oldpvop = old_pvo; 2893 return (EEXIST); 2894 } 2895 2896 if (pvo_head != NULL) { 2897 LIST_INSERT_HEAD(pvo_head, pvo, pvo_vlink); 2898 } 2899 2900 if (pvo->pvo_vaddr & PVO_WIRED) 2901 pvo->pvo_pmap->pm_stats.wired_count++; 2902 pvo->pvo_pmap->pm_stats.resident_count++; 2903 2904 /* 2905 * Insert it into the hardware page table 2906 */ 2907 err = moea64_pte_insert(pvo); 2908 if (err != 0) { 2909 panic("moea64_pvo_enter: overflow"); 2910 } 2911 2912 STAT_MOEA64(moea64_pvo_entries++); 2913 2914 if (pvo->pvo_pmap == kernel_pmap) 2915 isync(); 2916 2917#ifdef __powerpc64__ 2918 /* 2919 * Make sure all our bootstrap mappings are in the SLB as soon 2920 * as virtual memory is switched on. 2921 */ 2922 if (!pmap_bootstrapped) 2923 moea64_bootstrap_slb_prefault(PVO_VADDR(pvo), 2924 pvo->pvo_vaddr & PVO_LARGE); 2925#endif 2926 2927 return (0); 2928} 2929 2930static void 2931moea64_pvo_remove_from_pmap(struct pvo_entry *pvo) 2932{ 2933 struct vm_page *pg; 2934 int32_t refchg; 2935 2936 KASSERT(pvo->pvo_pmap != NULL, ("Trying to remove PVO with no pmap")); 2937 PMAP_LOCK_ASSERT(pvo->pvo_pmap, MA_OWNED); 2938 KASSERT(!(pvo->pvo_vaddr & PVO_DEAD), ("Trying to remove dead PVO")); 2939 2940 /* 2941 * If there is an active pte entry, we need to deactivate it 2942 */ 2943 refchg = moea64_pte_unset(pvo); 2944 if (refchg < 0) { 2945 /* 2946 * If it was evicted from the page table, be pessimistic and 2947 * dirty the page. 2948 */ 2949 if (pvo->pvo_pte.prot & VM_PROT_WRITE) 2950 refchg = LPTE_CHG; 2951 else 2952 refchg = 0; 2953 } 2954 2955 /* 2956 * Update our statistics. 2957 */ 2958 pvo->pvo_pmap->pm_stats.resident_count--; 2959 if (pvo->pvo_vaddr & PVO_WIRED) 2960 pvo->pvo_pmap->pm_stats.wired_count--; 2961 2962 /* 2963 * Remove this PVO from the pmap list. 2964 */ 2965 RB_REMOVE(pvo_tree, &pvo->pvo_pmap->pmap_pvo, pvo); 2966 2967 /* 2968 * Mark this for the next sweep 2969 */ 2970 pvo->pvo_vaddr |= PVO_DEAD; 2971 2972 /* Send RC bits to VM */ 2973 if ((pvo->pvo_vaddr & PVO_MANAGED) && 2974 (pvo->pvo_pte.prot & VM_PROT_WRITE)) { 2975 pg = PHYS_TO_VM_PAGE(PVO_PADDR(pvo)); 2976 if (pg != NULL) { 2977 refchg |= atomic_readandclear_32(&pg->md.mdpg_attrs); 2978 if (refchg & LPTE_CHG) 2979 vm_page_dirty(pg); 2980 if (refchg & LPTE_REF) 2981 vm_page_aflag_set(pg, PGA_REFERENCED); 2982 } 2983 } 2984} 2985 2986static inline void 2987moea64_pvo_remove_from_page_locked(struct pvo_entry *pvo, 2988 vm_page_t m) 2989{ 2990 2991 KASSERT(pvo->pvo_vaddr & PVO_DEAD, ("Trying to delink live page")); 2992 2993 /* Use NULL pmaps as a sentinel for races in page deletion */ 2994 if (pvo->pvo_pmap == NULL) 2995 return; 2996 pvo->pvo_pmap = NULL; 2997 2998 /* 2999 * Update vm about page writeability/executability if managed 3000 */ 3001 PV_LOCKASSERT(PVO_PADDR(pvo)); 3002 if (pvo->pvo_vaddr & PVO_MANAGED) { 3003 if (m != NULL) { 3004 LIST_REMOVE(pvo, pvo_vlink); 3005 if (LIST_EMPTY(vm_page_to_pvoh(m))) 3006 vm_page_aflag_clear(m, 3007 PGA_WRITEABLE | PGA_EXECUTABLE); 3008 } 3009 } 3010 3011 STAT_MOEA64(moea64_pvo_entries--); 3012 STAT_MOEA64(moea64_pvo_remove_calls++); 3013} 3014 3015static void 3016moea64_pvo_remove_from_page(struct pvo_entry *pvo) 3017{ 3018 vm_page_t pg = NULL; 3019 3020 if (pvo->pvo_vaddr & PVO_MANAGED) 3021 pg = PHYS_TO_VM_PAGE(PVO_PADDR(pvo)); 3022 3023 PV_LOCK(PVO_PADDR(pvo)); 3024 moea64_pvo_remove_from_page_locked(pvo, pg); 3025 PV_UNLOCK(PVO_PADDR(pvo)); 3026} 3027 3028static struct pvo_entry * 3029moea64_pvo_find_va(pmap_t pm, vm_offset_t va) 3030{ 3031 struct pvo_entry key; 3032 3033 PMAP_LOCK_ASSERT(pm, MA_OWNED); 3034 3035 key.pvo_vaddr = va & ~ADDR_POFF; 3036 return (RB_FIND(pvo_tree, &pm->pmap_pvo, &key)); 3037} 3038 3039static bool 3040moea64_query_bit(vm_page_t m, uint64_t ptebit) 3041{ 3042 struct pvo_entry *pvo; 3043 int64_t ret; 3044 bool rv; 3045 vm_page_t sp; 3046 3047 /* 3048 * See if this bit is stored in the page already. 3049 * 3050 * For superpages, the bit is stored in the first vm page. 3051 */ 3052 if ((m->md.mdpg_attrs & ptebit) != 0 || 3053 ((sp = PHYS_TO_VM_PAGE(VM_PAGE_TO_PHYS(m) & ~HPT_SP_MASK)) != NULL && 3054 (sp->md.mdpg_attrs & (ptebit | MDPG_ATTR_SP)) == 3055 (ptebit | MDPG_ATTR_SP))) 3056 return (true); 3057 3058 /* 3059 * Examine each PTE. Sync so that any pending REF/CHG bits are 3060 * flushed to the PTEs. 3061 */ 3062 rv = false; 3063 powerpc_sync(); 3064 PV_PAGE_LOCK(m); 3065 LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { 3066 if (PVO_IS_SP(pvo)) { 3067 ret = moea64_sp_query(pvo, ptebit); 3068 /* 3069 * If SP was not demoted, check its REF/CHG bits here. 3070 */ 3071 if (ret != -1) { 3072 if ((ret & ptebit) != 0) { 3073 rv = true; 3074 break; 3075 } 3076 continue; 3077 } 3078 /* else, fallthrough */ 3079 } 3080 3081 ret = 0; 3082 3083 /* 3084 * See if this pvo has a valid PTE. if so, fetch the 3085 * REF/CHG bits from the valid PTE. If the appropriate 3086 * ptebit is set, return success. 3087 */ 3088 PMAP_LOCK(pvo->pvo_pmap); 3089 if (!(pvo->pvo_vaddr & PVO_DEAD)) 3090 ret = moea64_pte_synch(pvo); 3091 PMAP_UNLOCK(pvo->pvo_pmap); 3092 3093 if (ret > 0) { 3094 atomic_set_32(&m->md.mdpg_attrs, 3095 ret & (LPTE_CHG | LPTE_REF)); 3096 if (ret & ptebit) { 3097 rv = true; 3098 break; 3099 } 3100 } 3101 } 3102 PV_PAGE_UNLOCK(m); 3103 3104 return (rv); 3105} 3106 3107static u_int 3108moea64_clear_bit(vm_page_t m, u_int64_t ptebit) 3109{ 3110 u_int count; 3111 struct pvo_entry *pvo; 3112 int64_t ret; 3113 3114 /* 3115 * Sync so that any pending REF/CHG bits are flushed to the PTEs (so 3116 * we can reset the right ones). 3117 */ 3118 powerpc_sync(); 3119 3120 /* 3121 * For each pvo entry, clear the pte's ptebit. 3122 */ 3123 count = 0; 3124 PV_PAGE_LOCK(m); 3125 LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { 3126 if (PVO_IS_SP(pvo)) { 3127 if ((ret = moea64_sp_clear(pvo, m, ptebit)) != -1) { 3128 count += ret; 3129 continue; 3130 } 3131 } 3132 ret = 0; 3133 3134 PMAP_LOCK(pvo->pvo_pmap); 3135 if (!(pvo->pvo_vaddr & PVO_DEAD)) 3136 ret = moea64_pte_clear(pvo, ptebit); 3137 PMAP_UNLOCK(pvo->pvo_pmap); 3138 3139 if (ret > 0 && (ret & ptebit)) 3140 count++; 3141 } 3142 atomic_clear_32(&m->md.mdpg_attrs, ptebit); 3143 PV_PAGE_UNLOCK(m); 3144 3145 return (count); 3146} 3147 3148int 3149moea64_dev_direct_mapped(vm_paddr_t pa, vm_size_t size) 3150{ 3151 struct pvo_entry *pvo, key; 3152 vm_offset_t ppa; 3153 int error = 0; 3154 3155 if (hw_direct_map && mem_valid(pa, size) == 0) 3156 return (0); 3157 3158 PMAP_LOCK(kernel_pmap); 3159 ppa = pa & ~ADDR_POFF; 3160 key.pvo_vaddr = DMAP_BASE_ADDRESS + ppa; 3161 for (pvo = RB_FIND(pvo_tree, &kernel_pmap->pmap_pvo, &key); 3162 ppa < pa + size; ppa += PAGE_SIZE, 3163 pvo = RB_NEXT(pvo_tree, &kernel_pmap->pmap_pvo, pvo)) { 3164 if (pvo == NULL || PVO_PADDR(pvo) != ppa) { 3165 error = EFAULT; 3166 break; 3167 } 3168 } 3169 PMAP_UNLOCK(kernel_pmap); 3170 3171 return (error); 3172} 3173 3174/* 3175 * Map a set of physical memory pages into the kernel virtual 3176 * address space. Return a pointer to where it is mapped. This 3177 * routine is intended to be used for mapping device memory, 3178 * NOT real memory. 3179 */ 3180void * 3181moea64_mapdev_attr(vm_paddr_t pa, vm_size_t size, vm_memattr_t ma) 3182{ 3183 vm_offset_t va, tmpva, ppa, offset; 3184 3185 ppa = trunc_page(pa); 3186 offset = pa & PAGE_MASK; 3187 size = roundup2(offset + size, PAGE_SIZE); 3188 3189 va = kva_alloc(size); 3190 3191 if (!va) 3192 panic("moea64_mapdev: Couldn't alloc kernel virtual memory"); 3193 3194 for (tmpva = va; size > 0;) { 3195 moea64_kenter_attr(tmpva, ppa, ma); 3196 size -= PAGE_SIZE; 3197 tmpva += PAGE_SIZE; 3198 ppa += PAGE_SIZE; 3199 } 3200 3201 return ((void *)(va + offset)); 3202} 3203 3204void * 3205moea64_mapdev(vm_paddr_t pa, vm_size_t size) 3206{ 3207 3208 return moea64_mapdev_attr(pa, size, VM_MEMATTR_DEFAULT); 3209} 3210 3211void 3212moea64_unmapdev(void *p, vm_size_t size) 3213{ 3214 vm_offset_t base, offset, va; 3215 3216 va = (vm_offset_t)p; 3217 base = trunc_page(va); 3218 offset = va & PAGE_MASK; 3219 size = roundup2(offset + size, PAGE_SIZE); 3220 3221 moea64_qremove(base, atop(size)); 3222 kva_free(base, size); 3223} 3224 3225void 3226moea64_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz) 3227{ 3228 struct pvo_entry *pvo; 3229 vm_offset_t lim; 3230 vm_paddr_t pa; 3231 vm_size_t len; 3232 3233 if (__predict_false(pm == NULL)) 3234 pm = &curthread->td_proc->p_vmspace->vm_pmap; 3235 3236 PMAP_LOCK(pm); 3237 while (sz > 0) { 3238 lim = round_page(va+1); 3239 len = MIN(lim - va, sz); 3240 pvo = moea64_pvo_find_va(pm, va & ~ADDR_POFF); 3241 if (pvo != NULL && !(pvo->pvo_pte.pa & LPTE_I)) { 3242 pa = PVO_PADDR(pvo) | (va & ADDR_POFF); 3243 moea64_syncicache(pm, va, pa, len); 3244 } 3245 va += len; 3246 sz -= len; 3247 } 3248 PMAP_UNLOCK(pm); 3249} 3250 3251void 3252moea64_dumpsys_map(vm_paddr_t pa, size_t sz, void **va) 3253{ 3254 3255 *va = (void *)(uintptr_t)pa; 3256} 3257 3258extern struct dump_pa dump_map[PHYS_AVAIL_SZ + 1]; 3259 3260void 3261moea64_scan_init(void) 3262{ 3263 struct pvo_entry *pvo; 3264 vm_offset_t va; 3265 int i; 3266 3267 if (!do_minidump) { 3268 /* Initialize phys. segments for dumpsys(). */ 3269 memset(&dump_map, 0, sizeof(dump_map)); 3270 mem_regions(&pregions, &pregions_sz, ®ions, ®ions_sz); 3271 for (i = 0; i < pregions_sz; i++) { 3272 dump_map[i].pa_start = pregions[i].mr_start; 3273 dump_map[i].pa_size = pregions[i].mr_size; 3274 } 3275 return; 3276 } 3277 3278 /* Virtual segments for minidumps: */ 3279 memset(&dump_map, 0, sizeof(dump_map)); 3280 3281 /* 1st: kernel .data and .bss. */ 3282 dump_map[0].pa_start = trunc_page((uintptr_t)_etext); 3283 dump_map[0].pa_size = round_page((uintptr_t)_end) - 3284 dump_map[0].pa_start; 3285 3286 /* 2nd: msgbuf and tables (see pmap_bootstrap()). */ 3287 dump_map[1].pa_start = (vm_paddr_t)(uintptr_t)msgbufp->msg_ptr; 3288 dump_map[1].pa_size = round_page(msgbufp->msg_size); 3289 3290 /* 3rd: kernel VM. */ 3291 va = dump_map[1].pa_start + dump_map[1].pa_size; 3292 /* Find start of next chunk (from va). */ 3293 while (va < virtual_end) { 3294 /* Don't dump the buffer cache. */ 3295 if (va >= kmi.buffer_sva && va < kmi.buffer_eva) { 3296 va = kmi.buffer_eva; 3297 continue; 3298 } 3299 pvo = moea64_pvo_find_va(kernel_pmap, va & ~ADDR_POFF); 3300 if (pvo != NULL && !(pvo->pvo_vaddr & PVO_DEAD)) 3301 break; 3302 va += PAGE_SIZE; 3303 } 3304 if (va < virtual_end) { 3305 dump_map[2].pa_start = va; 3306 va += PAGE_SIZE; 3307 /* Find last page in chunk. */ 3308 while (va < virtual_end) { 3309 /* Don't run into the buffer cache. */ 3310 if (va == kmi.buffer_sva) 3311 break; 3312 pvo = moea64_pvo_find_va(kernel_pmap, va & ~ADDR_POFF); 3313 if (pvo == NULL || (pvo->pvo_vaddr & PVO_DEAD)) 3314 break; 3315 va += PAGE_SIZE; 3316 } 3317 dump_map[2].pa_size = va - dump_map[2].pa_start; 3318 } 3319} 3320 3321#ifdef __powerpc64__ 3322 3323static size_t 3324moea64_scan_pmap(struct bitset *dump_bitset) 3325{ 3326 struct pvo_entry *pvo; 3327 vm_paddr_t pa, pa_end; 3328 vm_offset_t va, pgva, kstart, kend, kstart_lp, kend_lp; 3329 uint64_t lpsize; 3330 3331 lpsize = moea64_large_page_size; 3332 kstart = trunc_page((vm_offset_t)_etext); 3333 kend = round_page((vm_offset_t)_end); 3334 kstart_lp = kstart & ~moea64_large_page_mask; 3335 kend_lp = (kend + moea64_large_page_mask) & ~moea64_large_page_mask; 3336 3337 CTR4(KTR_PMAP, "moea64_scan_pmap: kstart=0x%016lx, kend=0x%016lx, " 3338 "kstart_lp=0x%016lx, kend_lp=0x%016lx", 3339 kstart, kend, kstart_lp, kend_lp); 3340 3341 PMAP_LOCK(kernel_pmap); 3342 RB_FOREACH(pvo, pvo_tree, &kernel_pmap->pmap_pvo) { 3343 va = pvo->pvo_vaddr; 3344 3345 if (va & PVO_DEAD) 3346 continue; 3347 3348 /* Skip DMAP (except kernel area) */ 3349 if (va >= DMAP_BASE_ADDRESS && va <= DMAP_MAX_ADDRESS) { 3350 if (va & PVO_LARGE) { 3351 pgva = va & ~moea64_large_page_mask; 3352 if (pgva < kstart_lp || pgva >= kend_lp) 3353 continue; 3354 } else { 3355 pgva = trunc_page(va); 3356 if (pgva < kstart || pgva >= kend) 3357 continue; 3358 } 3359 } 3360 3361 pa = PVO_PADDR(pvo); 3362 3363 if (va & PVO_LARGE) { 3364 pa_end = pa + lpsize; 3365 for (; pa < pa_end; pa += PAGE_SIZE) { 3366 if (vm_phys_is_dumpable(pa)) 3367 vm_page_dump_add(dump_bitset, pa); 3368 } 3369 } else { 3370 if (vm_phys_is_dumpable(pa)) 3371 vm_page_dump_add(dump_bitset, pa); 3372 } 3373 } 3374 PMAP_UNLOCK(kernel_pmap); 3375 3376 return (sizeof(struct lpte) * moea64_pteg_count * 8); 3377} 3378 3379static struct dump_context dump_ctx; 3380 3381static void * 3382moea64_dump_pmap_init(unsigned blkpgs) 3383{ 3384 dump_ctx.ptex = 0; 3385 dump_ctx.ptex_end = moea64_pteg_count * 8; 3386 dump_ctx.blksz = blkpgs * PAGE_SIZE; 3387 return (&dump_ctx); 3388} 3389 3390#else 3391 3392static size_t 3393moea64_scan_pmap(struct bitset *dump_bitset __unused) 3394{ 3395 return (0); 3396} 3397 3398static void * 3399moea64_dump_pmap_init(unsigned blkpgs) 3400{ 3401 return (NULL); 3402} 3403 3404#endif 3405 3406#ifdef __powerpc64__ 3407static void 3408moea64_map_range(vm_offset_t va, vm_paddr_t pa, vm_size_t npages) 3409{ 3410 3411 for (; npages > 0; --npages) { 3412 if (moea64_large_page_size != 0 && 3413 (pa & moea64_large_page_mask) == 0 && 3414 (va & moea64_large_page_mask) == 0 && 3415 npages >= (moea64_large_page_size >> PAGE_SHIFT)) { 3416 PMAP_LOCK(kernel_pmap); 3417 moea64_kenter_large(va, pa, 0, 0); 3418 PMAP_UNLOCK(kernel_pmap); 3419 pa += moea64_large_page_size; 3420 va += moea64_large_page_size; 3421 npages -= (moea64_large_page_size >> PAGE_SHIFT) - 1; 3422 } else { 3423 moea64_kenter(va, pa); 3424 pa += PAGE_SIZE; 3425 va += PAGE_SIZE; 3426 } 3427 } 3428} 3429 3430static void 3431moea64_page_array_startup(long pages) 3432{ 3433 long dom_pages[MAXMEMDOM]; 3434 vm_paddr_t pa; 3435 vm_offset_t va, vm_page_base; 3436 vm_size_t needed, size; 3437 int domain; 3438 int i; 3439 3440 vm_page_base = 0xd000000000000000ULL; 3441 3442 /* Short-circuit single-domain systems. */ 3443 if (vm_ndomains == 1) { 3444 size = round_page(pages * sizeof(struct vm_page)); 3445 pa = vm_phys_early_alloc(0, size); 3446 vm_page_base = moea64_map(&vm_page_base, 3447 pa, pa + size, VM_PROT_READ | VM_PROT_WRITE); 3448 vm_page_array_size = pages; 3449 vm_page_array = (vm_page_t)vm_page_base; 3450 return; 3451 } 3452 3453 for (i = 0; i < MAXMEMDOM; i++) 3454 dom_pages[i] = 0; 3455 3456 /* Now get the number of pages required per domain. */ 3457 for (i = 0; i < vm_phys_nsegs; i++) { 3458 domain = vm_phys_segs[i].domain; 3459 KASSERT(domain < MAXMEMDOM, 3460 ("Invalid vm_phys_segs NUMA domain %d!\n", domain)); 3461 /* Get size of vm_page_array needed for this segment. */ 3462 size = btoc(vm_phys_segs[i].end - vm_phys_segs[i].start); 3463 dom_pages[domain] += size; 3464 } 3465 3466 for (i = 0; phys_avail[i + 1] != 0; i+= 2) { 3467 domain = vm_phys_domain(phys_avail[i]); 3468 KASSERT(domain < MAXMEMDOM, 3469 ("Invalid phys_avail NUMA domain %d!\n", domain)); 3470 size = btoc(phys_avail[i + 1] - phys_avail[i]); 3471 dom_pages[domain] += size; 3472 } 3473 3474 /* 3475 * Map in chunks that can get us all 16MB pages. There will be some 3476 * overlap between domains, but that's acceptable for now. 3477 */ 3478 vm_page_array_size = 0; 3479 va = vm_page_base; 3480 for (i = 0; i < MAXMEMDOM && vm_page_array_size < pages; i++) { 3481 if (dom_pages[i] == 0) 3482 continue; 3483 size = ulmin(pages - vm_page_array_size, dom_pages[i]); 3484 size = round_page(size * sizeof(struct vm_page)); 3485 needed = size; 3486 size = roundup2(size, moea64_large_page_size); 3487 pa = vm_phys_early_alloc(i, size); 3488 vm_page_array_size += size / sizeof(struct vm_page); 3489 moea64_map_range(va, pa, size >> PAGE_SHIFT); 3490 /* Scoot up domain 0, to reduce the domain page overlap. */ 3491 if (i == 0) 3492 vm_page_base += size - needed; 3493 va += size; 3494 } 3495 vm_page_array = (vm_page_t)vm_page_base; 3496 vm_page_array_size = pages; 3497} 3498#endif 3499 3500static int64_t 3501moea64_null_method(void) 3502{ 3503 return (0); 3504} 3505 3506static int64_t moea64_pte_replace_default(struct pvo_entry *pvo, int flags) 3507{ 3508 int64_t refchg; 3509 3510 refchg = moea64_pte_unset(pvo); 3511 moea64_pte_insert(pvo); 3512 3513 return (refchg); 3514} 3515 3516struct moea64_funcs *moea64_ops; 3517 3518#define DEFINE_OEA64_IFUNC(ret, func, args, def) \ 3519 DEFINE_IFUNC(, ret, moea64_##func, args) { \ 3520 moea64_##func##_t f; \ 3521 if (moea64_ops == NULL) \ 3522 return ((moea64_##func##_t)def); \ 3523 f = moea64_ops->func; \ 3524 return (f != NULL ? f : (moea64_##func##_t)def);\ 3525 } 3526 3527void 3528moea64_install(void) 3529{ 3530#ifdef __powerpc64__ 3531 if (hw_direct_map == -1) { 3532 moea64_probe_large_page(); 3533 3534 /* Use a direct map if we have large page support */ 3535 if (moea64_large_page_size > 0) 3536 hw_direct_map = 1; 3537 else 3538 hw_direct_map = 0; 3539 } 3540#endif 3541 3542 /* 3543 * Default to non-DMAP, and switch over to DMAP functions once we know 3544 * we have DMAP. 3545 */ 3546 if (hw_direct_map) { 3547 moea64_methods.quick_enter_page = moea64_quick_enter_page_dmap; 3548 moea64_methods.quick_remove_page = NULL; 3549 moea64_methods.copy_page = moea64_copy_page_dmap; 3550 moea64_methods.zero_page = moea64_zero_page_dmap; 3551 moea64_methods.copy_pages = moea64_copy_pages_dmap; 3552 } 3553} 3554 3555DEFINE_OEA64_IFUNC(int64_t, pte_replace, (struct pvo_entry *, int), 3556 moea64_pte_replace_default) 3557DEFINE_OEA64_IFUNC(int64_t, pte_insert, (struct pvo_entry *), moea64_null_method) 3558DEFINE_OEA64_IFUNC(int64_t, pte_unset, (struct pvo_entry *), moea64_null_method) 3559DEFINE_OEA64_IFUNC(int64_t, pte_clear, (struct pvo_entry *, uint64_t), 3560 moea64_null_method) 3561DEFINE_OEA64_IFUNC(int64_t, pte_synch, (struct pvo_entry *), moea64_null_method) 3562DEFINE_OEA64_IFUNC(int64_t, pte_insert_sp, (struct pvo_entry *), moea64_null_method) 3563DEFINE_OEA64_IFUNC(int64_t, pte_unset_sp, (struct pvo_entry *), moea64_null_method) 3564DEFINE_OEA64_IFUNC(int64_t, pte_replace_sp, (struct pvo_entry *), moea64_null_method) 3565 3566/* Superpage functions */ 3567 3568/* MMU interface */ 3569 3570static bool 3571moea64_ps_enabled(pmap_t pmap) 3572{ 3573 return (superpages_enabled); 3574} 3575 3576static void 3577moea64_align_superpage(vm_object_t object, vm_ooffset_t offset, 3578 vm_offset_t *addr, vm_size_t size) 3579{ 3580 vm_offset_t sp_offset; 3581 3582 if (size < HPT_SP_SIZE) 3583 return; 3584 3585 CTR4(KTR_PMAP, "%s: offs=%#jx, addr=%p, size=%#jx", 3586 __func__, (uintmax_t)offset, addr, (uintmax_t)size); 3587 3588 if (object != NULL && (object->flags & OBJ_COLORED) != 0) 3589 offset += ptoa(object->pg_color); 3590 sp_offset = offset & HPT_SP_MASK; 3591 if (size - ((HPT_SP_SIZE - sp_offset) & HPT_SP_MASK) < HPT_SP_SIZE || 3592 (*addr & HPT_SP_MASK) == sp_offset) 3593 return; 3594 if ((*addr & HPT_SP_MASK) < sp_offset) 3595 *addr = (*addr & ~HPT_SP_MASK) + sp_offset; 3596 else 3597 *addr = ((*addr + HPT_SP_MASK) & ~HPT_SP_MASK) + sp_offset; 3598} 3599 3600/* Helpers */ 3601 3602static __inline void 3603moea64_pvo_cleanup(struct pvo_dlist *tofree) 3604{ 3605 struct pvo_entry *pvo; 3606 3607 /* clean up */ 3608 while (!SLIST_EMPTY(tofree)) { 3609 pvo = SLIST_FIRST(tofree); 3610 SLIST_REMOVE_HEAD(tofree, pvo_dlink); 3611 if (pvo->pvo_vaddr & PVO_DEAD) 3612 moea64_pvo_remove_from_page(pvo); 3613 free_pvo_entry(pvo); 3614 } 3615} 3616 3617static __inline uint16_t 3618pvo_to_vmpage_flags(struct pvo_entry *pvo) 3619{ 3620 uint16_t flags; 3621 3622 flags = 0; 3623 if ((pvo->pvo_pte.prot & VM_PROT_WRITE) != 0) 3624 flags |= PGA_WRITEABLE; 3625 if ((pvo->pvo_pte.prot & VM_PROT_EXECUTE) != 0) 3626 flags |= PGA_EXECUTABLE; 3627 3628 return (flags); 3629} 3630 3631/* 3632 * Check if the given pvo and its superpage are in sva-eva range. 3633 */ 3634static __inline bool 3635moea64_sp_pvo_in_range(struct pvo_entry *pvo, vm_offset_t sva, vm_offset_t eva) 3636{ 3637 vm_offset_t spva; 3638 3639 spva = PVO_VADDR(pvo) & ~HPT_SP_MASK; 3640 if (spva >= sva && spva + HPT_SP_SIZE <= eva) { 3641 /* 3642 * Because this function is intended to be called from loops 3643 * that iterate over ordered pvo entries, if the condition 3644 * above is true then the pvo must be the first of its 3645 * superpage. 3646 */ 3647 KASSERT(PVO_VADDR(pvo) == spva, 3648 ("%s: unexpected unaligned superpage pvo", __func__)); 3649 return (true); 3650 } 3651 return (false); 3652} 3653 3654/* 3655 * Update vm about the REF/CHG bits if the superpage is managed and 3656 * has (or had) write access. 3657 */ 3658static void 3659moea64_sp_refchg_process(struct pvo_entry *sp, vm_page_t m, 3660 int64_t sp_refchg, vm_prot_t prot) 3661{ 3662 vm_page_t m_end; 3663 int64_t refchg; 3664 3665 if ((sp->pvo_vaddr & PVO_MANAGED) != 0 && (prot & VM_PROT_WRITE) != 0) { 3666 for (m_end = &m[HPT_SP_PAGES]; m < m_end; m++) { 3667 refchg = sp_refchg | 3668 atomic_readandclear_32(&m->md.mdpg_attrs); 3669 if (refchg & LPTE_CHG) 3670 vm_page_dirty(m); 3671 if (refchg & LPTE_REF) 3672 vm_page_aflag_set(m, PGA_REFERENCED); 3673 } 3674 } 3675} 3676 3677/* Superpage ops */ 3678 3679static int 3680moea64_sp_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, 3681 vm_prot_t prot, u_int flags, int8_t psind) 3682{ 3683 struct pvo_entry *pvo, **pvos; 3684 struct pvo_head *pvo_head; 3685 vm_offset_t sva; 3686 vm_page_t sm; 3687 vm_paddr_t pa, spa; 3688 bool sync; 3689 struct pvo_dlist tofree; 3690 int error __diagused, i; 3691 uint16_t aflags; 3692 3693 KASSERT((va & HPT_SP_MASK) == 0, ("%s: va %#jx unaligned", 3694 __func__, (uintmax_t)va)); 3695 KASSERT(psind == 1, ("%s: invalid psind: %d", __func__, psind)); 3696 KASSERT(m->psind == 1, ("%s: invalid m->psind: %d", 3697 __func__, m->psind)); 3698 KASSERT(pmap != kernel_pmap, 3699 ("%s: function called with kernel pmap", __func__)); 3700 3701 CTR5(KTR_PMAP, "%s: va=%#jx, pa=%#jx, prot=%#x, flags=%#x, psind=1", 3702 __func__, (uintmax_t)va, (uintmax_t)VM_PAGE_TO_PHYS(m), 3703 prot, flags); 3704 3705 SLIST_INIT(&tofree); 3706 3707 sva = va; 3708 sm = m; 3709 spa = pa = VM_PAGE_TO_PHYS(sm); 3710 3711 /* Try to allocate all PVOs first, to make failure handling easier. */ 3712 pvos = malloc(HPT_SP_PAGES * sizeof(struct pvo_entry *), M_TEMP, 3713 M_NOWAIT); 3714 if (pvos == NULL) { 3715 CTR1(KTR_PMAP, "%s: failed to alloc pvo array", __func__); 3716 return (KERN_RESOURCE_SHORTAGE); 3717 } 3718 3719 for (i = 0; i < HPT_SP_PAGES; i++) { 3720 pvos[i] = alloc_pvo_entry(0); 3721 if (pvos[i] == NULL) { 3722 CTR1(KTR_PMAP, "%s: failed to alloc pvo", __func__); 3723 for (i = i - 1; i >= 0; i--) 3724 free_pvo_entry(pvos[i]); 3725 free(pvos, M_TEMP); 3726 return (KERN_RESOURCE_SHORTAGE); 3727 } 3728 } 3729 3730 SP_PV_LOCK_ALIGNED(spa); 3731 PMAP_LOCK(pmap); 3732 3733 /* Note: moea64_remove_locked() also clears cached REF/CHG bits. */ 3734 moea64_remove_locked(pmap, va, va + HPT_SP_SIZE, &tofree); 3735 3736 /* Enter pages */ 3737 for (i = 0; i < HPT_SP_PAGES; 3738 i++, va += PAGE_SIZE, pa += PAGE_SIZE, m++) { 3739 pvo = pvos[i]; 3740 3741 pvo->pvo_pte.prot = prot; 3742 pvo->pvo_pte.pa = (pa & ~HPT_SP_MASK) | LPTE_LP_4K_16M | 3743 moea64_calc_wimg(pa, pmap_page_get_memattr(m)); 3744 3745 if ((flags & PMAP_ENTER_WIRED) != 0) 3746 pvo->pvo_vaddr |= PVO_WIRED; 3747 pvo->pvo_vaddr |= PVO_LARGE; 3748 3749 if ((m->oflags & VPO_UNMANAGED) != 0) 3750 pvo_head = NULL; 3751 else { 3752 pvo_head = &m->md.mdpg_pvoh; 3753 pvo->pvo_vaddr |= PVO_MANAGED; 3754 } 3755 3756 init_pvo_entry(pvo, pmap, va); 3757 3758 error = moea64_pvo_enter(pvo, pvo_head, NULL); 3759 /* 3760 * All superpage PVOs were previously removed, so no errors 3761 * should occur while inserting the new ones. 3762 */ 3763 KASSERT(error == 0, ("%s: unexpected error " 3764 "when inserting superpage PVO: %d", 3765 __func__, error)); 3766 } 3767 3768 PMAP_UNLOCK(pmap); 3769 SP_PV_UNLOCK_ALIGNED(spa); 3770 3771 sync = (sm->a.flags & PGA_EXECUTABLE) == 0; 3772 /* Note: moea64_pvo_cleanup() also clears page prot. flags. */ 3773 moea64_pvo_cleanup(&tofree); 3774 pvo = pvos[0]; 3775 3776 /* Set vm page flags */ 3777 aflags = pvo_to_vmpage_flags(pvo); 3778 if (aflags != 0) 3779 for (m = sm; m < &sm[HPT_SP_PAGES]; m++) 3780 vm_page_aflag_set(m, aflags); 3781 3782 /* 3783 * Flush the page from the instruction cache if this page is 3784 * mapped executable and cacheable. 3785 */ 3786 if (sync && (pvo->pvo_pte.pa & (LPTE_I | LPTE_G | LPTE_NOEXEC)) == 0) 3787 moea64_syncicache(pmap, sva, spa, HPT_SP_SIZE); 3788 3789 atomic_add_long(&sp_mappings, 1); 3790 CTR3(KTR_PMAP, "%s: SP success for va %#jx in pmap %p", 3791 __func__, (uintmax_t)sva, pmap); 3792 3793 free(pvos, M_TEMP); 3794 return (KERN_SUCCESS); 3795} 3796 3797static void 3798moea64_sp_promote(pmap_t pmap, vm_offset_t va, vm_page_t m) 3799{ 3800 struct pvo_entry *first, *pvo; 3801 vm_paddr_t pa, pa_end; 3802 vm_offset_t sva, va_end; 3803 int64_t sp_refchg; 3804 3805 /* This CTR may generate a lot of output. */ 3806 /* CTR2(KTR_PMAP, "%s: va=%#jx", __func__, (uintmax_t)va); */ 3807 3808 va &= ~HPT_SP_MASK; 3809 sva = va; 3810 /* Get superpage */ 3811 pa = VM_PAGE_TO_PHYS(m) & ~HPT_SP_MASK; 3812 m = PHYS_TO_VM_PAGE(pa); 3813 3814 PMAP_LOCK(pmap); 3815 3816 /* 3817 * Check if all pages meet promotion criteria. 3818 * 3819 * XXX In some cases the loop below may be executed for each or most 3820 * of the entered pages of a superpage, which can be expensive 3821 * (although it was not profiled) and need some optimization. 3822 * 3823 * Some cases where this seems to happen are: 3824 * - When a superpage is first entered read-only and later becomes 3825 * read-write. 3826 * - When some of the superpage's virtual addresses map to previously 3827 * wired/cached pages while others map to pages allocated from a 3828 * different physical address range. A common scenario where this 3829 * happens is when mmap'ing a file that is already present in FS 3830 * block cache and doesn't fill a superpage. 3831 */ 3832 first = pvo = moea64_pvo_find_va(pmap, sva); 3833 for (pa_end = pa + HPT_SP_SIZE; 3834 pa < pa_end; pa += PAGE_SIZE, va += PAGE_SIZE) { 3835 if (pvo == NULL || (pvo->pvo_vaddr & PVO_DEAD) != 0) { 3836 CTR3(KTR_PMAP, 3837 "%s: NULL or dead PVO: pmap=%p, va=%#jx", 3838 __func__, pmap, (uintmax_t)va); 3839 goto error; 3840 } 3841 if (PVO_PADDR(pvo) != pa) { 3842 CTR5(KTR_PMAP, "%s: PAs don't match: " 3843 "pmap=%p, va=%#jx, pvo_pa=%#jx, exp_pa=%#jx", 3844 __func__, pmap, (uintmax_t)va, 3845 (uintmax_t)PVO_PADDR(pvo), (uintmax_t)pa); 3846 atomic_add_long(&sp_p_fail_pa, 1); 3847 goto error; 3848 } 3849 if ((first->pvo_vaddr & PVO_FLAGS_PROMOTE) != 3850 (pvo->pvo_vaddr & PVO_FLAGS_PROMOTE)) { 3851 CTR5(KTR_PMAP, "%s: PVO flags don't match: " 3852 "pmap=%p, va=%#jx, pvo_flags=%#jx, exp_flags=%#jx", 3853 __func__, pmap, (uintmax_t)va, 3854 (uintmax_t)(pvo->pvo_vaddr & PVO_FLAGS_PROMOTE), 3855 (uintmax_t)(first->pvo_vaddr & PVO_FLAGS_PROMOTE)); 3856 atomic_add_long(&sp_p_fail_flags, 1); 3857 goto error; 3858 } 3859 if (first->pvo_pte.prot != pvo->pvo_pte.prot) { 3860 CTR5(KTR_PMAP, "%s: PVO protections don't match: " 3861 "pmap=%p, va=%#jx, pvo_prot=%#x, exp_prot=%#x", 3862 __func__, pmap, (uintmax_t)va, 3863 pvo->pvo_pte.prot, first->pvo_pte.prot); 3864 atomic_add_long(&sp_p_fail_prot, 1); 3865 goto error; 3866 } 3867 if ((first->pvo_pte.pa & LPTE_WIMG) != 3868 (pvo->pvo_pte.pa & LPTE_WIMG)) { 3869 CTR5(KTR_PMAP, "%s: WIMG bits don't match: " 3870 "pmap=%p, va=%#jx, pvo_wimg=%#jx, exp_wimg=%#jx", 3871 __func__, pmap, (uintmax_t)va, 3872 (uintmax_t)(pvo->pvo_pte.pa & LPTE_WIMG), 3873 (uintmax_t)(first->pvo_pte.pa & LPTE_WIMG)); 3874 atomic_add_long(&sp_p_fail_wimg, 1); 3875 goto error; 3876 } 3877 3878 pvo = RB_NEXT(pvo_tree, &pmap->pmap_pvo, pvo); 3879 } 3880 3881 /* All OK, promote. */ 3882 3883 /* 3884 * Handle superpage REF/CHG bits. If REF or CHG is set in 3885 * any page, then it must be set in the superpage. 3886 * 3887 * Instead of querying each page, we take advantage of two facts: 3888 * 1- If a page is being promoted, it was referenced. 3889 * 2- If promoted pages are writable, they were modified. 3890 */ 3891 sp_refchg = LPTE_REF | 3892 ((first->pvo_pte.prot & VM_PROT_WRITE) != 0 ? LPTE_CHG : 0); 3893 3894 /* Promote pages */ 3895 3896 for (pvo = first, va_end = PVO_VADDR(pvo) + HPT_SP_SIZE; 3897 pvo != NULL && PVO_VADDR(pvo) < va_end; 3898 pvo = RB_NEXT(pvo_tree, &pmap->pmap_pvo, pvo)) { 3899 pvo->pvo_pte.pa &= ADDR_POFF | ~HPT_SP_MASK; 3900 pvo->pvo_pte.pa |= LPTE_LP_4K_16M; 3901 pvo->pvo_vaddr |= PVO_LARGE; 3902 } 3903 moea64_pte_replace_sp(first); 3904 3905 /* Send REF/CHG bits to VM */ 3906 moea64_sp_refchg_process(first, m, sp_refchg, first->pvo_pte.prot); 3907 3908 /* Use first page to cache REF/CHG bits */ 3909 atomic_set_32(&m->md.mdpg_attrs, sp_refchg | MDPG_ATTR_SP); 3910 3911 PMAP_UNLOCK(pmap); 3912 3913 atomic_add_long(&sp_mappings, 1); 3914 atomic_add_long(&sp_promotions, 1); 3915 CTR3(KTR_PMAP, "%s: success for va %#jx in pmap %p", 3916 __func__, (uintmax_t)sva, pmap); 3917 return; 3918 3919error: 3920 atomic_add_long(&sp_p_failures, 1); 3921 PMAP_UNLOCK(pmap); 3922} 3923 3924static void 3925moea64_sp_demote_aligned(struct pvo_entry *sp) 3926{ 3927 struct pvo_entry *pvo; 3928 vm_offset_t va, va_end; 3929 vm_paddr_t pa; 3930 vm_page_t m; 3931 pmap_t pmap __diagused; 3932 int64_t refchg; 3933 3934 CTR2(KTR_PMAP, "%s: va=%#jx", __func__, (uintmax_t)PVO_VADDR(sp)); 3935 3936 pmap = sp->pvo_pmap; 3937 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 3938 3939 pvo = sp; 3940 3941 /* Demote pages */ 3942 3943 va = PVO_VADDR(pvo); 3944 pa = PVO_PADDR(pvo); 3945 m = PHYS_TO_VM_PAGE(pa); 3946 3947 for (pvo = sp, va_end = va + HPT_SP_SIZE; 3948 pvo != NULL && PVO_VADDR(pvo) < va_end; 3949 pvo = RB_NEXT(pvo_tree, &pmap->pmap_pvo, pvo), 3950 va += PAGE_SIZE, pa += PAGE_SIZE) { 3951 KASSERT(pvo && PVO_VADDR(pvo) == va, 3952 ("%s: missing PVO for va %#jx", __func__, (uintmax_t)va)); 3953 3954 pvo->pvo_vaddr &= ~PVO_LARGE; 3955 pvo->pvo_pte.pa &= ~LPTE_RPGN; 3956 pvo->pvo_pte.pa |= pa; 3957 3958 } 3959 refchg = moea64_pte_replace_sp(sp); 3960 3961 /* 3962 * Clear SP flag 3963 * 3964 * XXX It is possible that another pmap has this page mapped as 3965 * part of a superpage, but as the SP flag is used only for 3966 * caching SP REF/CHG bits, that will be queried if not set 3967 * in cache, it should be ok to clear it here. 3968 */ 3969 atomic_clear_32(&m->md.mdpg_attrs, MDPG_ATTR_SP); 3970 3971 /* 3972 * Handle superpage REF/CHG bits. A bit set in the superpage 3973 * means all pages should consider it set. 3974 */ 3975 moea64_sp_refchg_process(sp, m, refchg, sp->pvo_pte.prot); 3976 3977 atomic_add_long(&sp_demotions, 1); 3978 CTR3(KTR_PMAP, "%s: success for va %#jx in pmap %p", 3979 __func__, (uintmax_t)PVO_VADDR(sp), pmap); 3980} 3981 3982static void 3983moea64_sp_demote(struct pvo_entry *pvo) 3984{ 3985 PMAP_LOCK_ASSERT(pvo->pvo_pmap, MA_OWNED); 3986 3987 if ((PVO_VADDR(pvo) & HPT_SP_MASK) != 0) { 3988 pvo = moea64_pvo_find_va(pvo->pvo_pmap, 3989 PVO_VADDR(pvo) & ~HPT_SP_MASK); 3990 KASSERT(pvo != NULL, ("%s: missing PVO for va %#jx", 3991 __func__, (uintmax_t)(PVO_VADDR(pvo) & ~HPT_SP_MASK))); 3992 } 3993 moea64_sp_demote_aligned(pvo); 3994} 3995 3996static struct pvo_entry * 3997moea64_sp_unwire(struct pvo_entry *sp) 3998{ 3999 struct pvo_entry *pvo, *prev; 4000 vm_offset_t eva; 4001 pmap_t pm; 4002 int64_t ret, refchg; 4003 4004 CTR2(KTR_PMAP, "%s: va=%#jx", __func__, (uintmax_t)PVO_VADDR(sp)); 4005 4006 pm = sp->pvo_pmap; 4007 PMAP_LOCK_ASSERT(pm, MA_OWNED); 4008 4009 eva = PVO_VADDR(sp) + HPT_SP_SIZE; 4010 refchg = 0; 4011 for (pvo = sp; pvo != NULL && PVO_VADDR(pvo) < eva; 4012 prev = pvo, pvo = RB_NEXT(pvo_tree, &pm->pmap_pvo, pvo)) { 4013 if ((pvo->pvo_vaddr & PVO_WIRED) == 0) 4014 panic("%s: pvo %p is missing PVO_WIRED", 4015 __func__, pvo); 4016 pvo->pvo_vaddr &= ~PVO_WIRED; 4017 4018 ret = moea64_pte_replace(pvo, 0 /* No invalidation */); 4019 if (ret < 0) 4020 refchg |= LPTE_CHG; 4021 else 4022 refchg |= ret; 4023 4024 pm->pm_stats.wired_count--; 4025 } 4026 4027 /* Send REF/CHG bits to VM */ 4028 moea64_sp_refchg_process(sp, PHYS_TO_VM_PAGE(PVO_PADDR(sp)), 4029 refchg, sp->pvo_pte.prot); 4030 4031 return (prev); 4032} 4033 4034static struct pvo_entry * 4035moea64_sp_protect(struct pvo_entry *sp, vm_prot_t prot) 4036{ 4037 struct pvo_entry *pvo, *prev; 4038 vm_offset_t eva; 4039 pmap_t pm; 4040 vm_page_t m, m_end; 4041 int64_t ret, refchg; 4042 vm_prot_t oldprot; 4043 4044 CTR3(KTR_PMAP, "%s: va=%#jx, prot=%x", 4045 __func__, (uintmax_t)PVO_VADDR(sp), prot); 4046 4047 pm = sp->pvo_pmap; 4048 PMAP_LOCK_ASSERT(pm, MA_OWNED); 4049 4050 oldprot = sp->pvo_pte.prot; 4051 m = PHYS_TO_VM_PAGE(PVO_PADDR(sp)); 4052 KASSERT(m != NULL, ("%s: missing vm page for pa %#jx", 4053 __func__, (uintmax_t)PVO_PADDR(sp))); 4054 eva = PVO_VADDR(sp) + HPT_SP_SIZE; 4055 refchg = 0; 4056 4057 for (pvo = sp; pvo != NULL && PVO_VADDR(pvo) < eva; 4058 prev = pvo, pvo = RB_NEXT(pvo_tree, &pm->pmap_pvo, pvo)) { 4059 pvo->pvo_pte.prot = prot; 4060 /* 4061 * If the PVO is in the page table, update mapping 4062 */ 4063 ret = moea64_pte_replace(pvo, MOEA64_PTE_PROT_UPDATE); 4064 if (ret < 0) 4065 refchg |= LPTE_CHG; 4066 else 4067 refchg |= ret; 4068 } 4069 4070 /* Send REF/CHG bits to VM */ 4071 moea64_sp_refchg_process(sp, m, refchg, oldprot); 4072 4073 /* Handle pages that became executable */ 4074 if ((m->a.flags & PGA_EXECUTABLE) == 0 && 4075 (sp->pvo_pte.pa & (LPTE_I | LPTE_G | LPTE_NOEXEC)) == 0) { 4076 if ((m->oflags & VPO_UNMANAGED) == 0) 4077 for (m_end = &m[HPT_SP_PAGES]; m < m_end; m++) 4078 vm_page_aflag_set(m, PGA_EXECUTABLE); 4079 moea64_syncicache(pm, PVO_VADDR(sp), PVO_PADDR(sp), 4080 HPT_SP_SIZE); 4081 } 4082 4083 return (prev); 4084} 4085 4086static struct pvo_entry * 4087moea64_sp_remove(struct pvo_entry *sp, struct pvo_dlist *tofree) 4088{ 4089 struct pvo_entry *pvo, *tpvo; 4090 vm_offset_t eva; 4091 pmap_t pm __diagused; 4092 4093 CTR2(KTR_PMAP, "%s: va=%#jx", __func__, (uintmax_t)PVO_VADDR(sp)); 4094 4095 pm = sp->pvo_pmap; 4096 PMAP_LOCK_ASSERT(pm, MA_OWNED); 4097 4098 eva = PVO_VADDR(sp) + HPT_SP_SIZE; 4099 for (pvo = sp; pvo != NULL && PVO_VADDR(pvo) < eva; pvo = tpvo) { 4100 tpvo = RB_NEXT(pvo_tree, &pm->pmap_pvo, pvo); 4101 4102 /* 4103 * For locking reasons, remove this from the page table and 4104 * pmap, but save delinking from the vm_page for a second 4105 * pass 4106 */ 4107 moea64_pvo_remove_from_pmap(pvo); 4108 SLIST_INSERT_HEAD(tofree, pvo, pvo_dlink); 4109 } 4110 4111 /* 4112 * Clear SP bit 4113 * 4114 * XXX See comment in moea64_sp_demote_aligned() for why it's 4115 * ok to always clear the SP bit on remove/demote. 4116 */ 4117 atomic_clear_32(&PHYS_TO_VM_PAGE(PVO_PADDR(sp))->md.mdpg_attrs, 4118 MDPG_ATTR_SP); 4119 4120 return (tpvo); 4121} 4122 4123static int64_t 4124moea64_sp_query_locked(struct pvo_entry *pvo, uint64_t ptebit) 4125{ 4126 int64_t refchg, ret; 4127 vm_offset_t eva; 4128 vm_page_t m; 4129 pmap_t pmap; 4130 struct pvo_entry *sp; 4131 4132 pmap = pvo->pvo_pmap; 4133 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 4134 4135 /* Get first SP PVO */ 4136 if ((PVO_VADDR(pvo) & HPT_SP_MASK) != 0) { 4137 sp = moea64_pvo_find_va(pmap, PVO_VADDR(pvo) & ~HPT_SP_MASK); 4138 KASSERT(sp != NULL, ("%s: missing PVO for va %#jx", 4139 __func__, (uintmax_t)(PVO_VADDR(pvo) & ~HPT_SP_MASK))); 4140 } else 4141 sp = pvo; 4142 eva = PVO_VADDR(sp) + HPT_SP_SIZE; 4143 4144 refchg = 0; 4145 for (pvo = sp; pvo != NULL && PVO_VADDR(pvo) < eva; 4146 pvo = RB_NEXT(pvo_tree, &pmap->pmap_pvo, pvo)) { 4147 ret = moea64_pte_synch(pvo); 4148 if (ret > 0) { 4149 refchg |= ret & (LPTE_CHG | LPTE_REF); 4150 if ((refchg & ptebit) != 0) 4151 break; 4152 } 4153 } 4154 4155 /* Save results */ 4156 if (refchg != 0) { 4157 m = PHYS_TO_VM_PAGE(PVO_PADDR(sp)); 4158 atomic_set_32(&m->md.mdpg_attrs, refchg | MDPG_ATTR_SP); 4159 } 4160 4161 return (refchg); 4162} 4163 4164static int64_t 4165moea64_sp_query(struct pvo_entry *pvo, uint64_t ptebit) 4166{ 4167 int64_t refchg; 4168 pmap_t pmap; 4169 4170 pmap = pvo->pvo_pmap; 4171 PMAP_LOCK(pmap); 4172 4173 /* 4174 * Check if SP was demoted/removed before pmap lock was acquired. 4175 */ 4176 if (!PVO_IS_SP(pvo) || (pvo->pvo_vaddr & PVO_DEAD) != 0) { 4177 CTR2(KTR_PMAP, "%s: demoted/removed: pa=%#jx", 4178 __func__, (uintmax_t)PVO_PADDR(pvo)); 4179 PMAP_UNLOCK(pmap); 4180 return (-1); 4181 } 4182 4183 refchg = moea64_sp_query_locked(pvo, ptebit); 4184 PMAP_UNLOCK(pmap); 4185 4186 CTR4(KTR_PMAP, "%s: va=%#jx, pa=%#jx: refchg=%#jx", 4187 __func__, (uintmax_t)PVO_VADDR(pvo), 4188 (uintmax_t)PVO_PADDR(pvo), (uintmax_t)refchg); 4189 4190 return (refchg); 4191} 4192 4193static int64_t 4194moea64_sp_pvo_clear(struct pvo_entry *pvo, uint64_t ptebit) 4195{ 4196 int64_t refchg, ret; 4197 pmap_t pmap; 4198 struct pvo_entry *sp; 4199 vm_offset_t eva; 4200 vm_page_t m; 4201 4202 pmap = pvo->pvo_pmap; 4203 PMAP_LOCK(pmap); 4204 4205 /* 4206 * Check if SP was demoted/removed before pmap lock was acquired. 4207 */ 4208 if (!PVO_IS_SP(pvo) || (pvo->pvo_vaddr & PVO_DEAD) != 0) { 4209 CTR2(KTR_PMAP, "%s: demoted/removed: pa=%#jx", 4210 __func__, (uintmax_t)PVO_PADDR(pvo)); 4211 PMAP_UNLOCK(pmap); 4212 return (-1); 4213 } 4214 4215 /* Get first SP PVO */ 4216 if ((PVO_VADDR(pvo) & HPT_SP_MASK) != 0) { 4217 sp = moea64_pvo_find_va(pmap, PVO_VADDR(pvo) & ~HPT_SP_MASK); 4218 KASSERT(sp != NULL, ("%s: missing PVO for va %#jx", 4219 __func__, (uintmax_t)(PVO_VADDR(pvo) & ~HPT_SP_MASK))); 4220 } else 4221 sp = pvo; 4222 eva = PVO_VADDR(sp) + HPT_SP_SIZE; 4223 4224 refchg = 0; 4225 for (pvo = sp; pvo != NULL && PVO_VADDR(pvo) < eva; 4226 pvo = RB_NEXT(pvo_tree, &pmap->pmap_pvo, pvo)) { 4227 ret = moea64_pte_clear(pvo, ptebit); 4228 if (ret > 0) 4229 refchg |= ret & (LPTE_CHG | LPTE_REF); 4230 } 4231 4232 m = PHYS_TO_VM_PAGE(PVO_PADDR(sp)); 4233 atomic_clear_32(&m->md.mdpg_attrs, ptebit); 4234 PMAP_UNLOCK(pmap); 4235 4236 CTR4(KTR_PMAP, "%s: va=%#jx, pa=%#jx: refchg=%#jx", 4237 __func__, (uintmax_t)PVO_VADDR(sp), 4238 (uintmax_t)PVO_PADDR(sp), (uintmax_t)refchg); 4239 4240 return (refchg); 4241} 4242 4243static int64_t 4244moea64_sp_clear(struct pvo_entry *pvo, vm_page_t m, uint64_t ptebit) 4245{ 4246 int64_t count, ret; 4247 pmap_t pmap; 4248 4249 count = 0; 4250 pmap = pvo->pvo_pmap; 4251 4252 /* 4253 * Since this reference bit is shared by 4096 4KB pages, it 4254 * should not be cleared every time it is tested. Apply a 4255 * simple "hash" function on the physical page number, the 4256 * virtual superpage number, and the pmap address to select 4257 * one 4KB page out of the 4096 on which testing the 4258 * reference bit will result in clearing that reference bit. 4259 * This function is designed to avoid the selection of the 4260 * same 4KB page for every 16MB page mapping. 4261 * 4262 * Always leave the reference bit of a wired mapping set, as 4263 * the current state of its reference bit won't affect page 4264 * replacement. 4265 */ 4266 if (ptebit == LPTE_REF && (((VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT) ^ 4267 (PVO_VADDR(pvo) >> HPT_SP_SHIFT) ^ (uintptr_t)pmap) & 4268 (HPT_SP_PAGES - 1)) == 0 && (pvo->pvo_vaddr & PVO_WIRED) == 0) { 4269 if ((ret = moea64_sp_pvo_clear(pvo, ptebit)) == -1) 4270 return (-1); 4271 4272 if ((ret & ptebit) != 0) 4273 count++; 4274 4275 /* 4276 * If this page was not selected by the hash function, then assume 4277 * its REF bit was set. 4278 */ 4279 } else if (ptebit == LPTE_REF) { 4280 count++; 4281 4282 /* 4283 * To clear the CHG bit of a single SP page, first it must be demoted. 4284 * But if no CHG bit is set, no bit clear and thus no SP demotion is 4285 * needed. 4286 */ 4287 } else { 4288 CTR4(KTR_PMAP, "%s: ptebit=%#jx, va=%#jx, pa=%#jx", 4289 __func__, (uintmax_t)ptebit, (uintmax_t)PVO_VADDR(pvo), 4290 (uintmax_t)PVO_PADDR(pvo)); 4291 4292 PMAP_LOCK(pmap); 4293 4294 /* 4295 * Make sure SP wasn't demoted/removed before pmap lock 4296 * was acquired. 4297 */ 4298 if (!PVO_IS_SP(pvo) || (pvo->pvo_vaddr & PVO_DEAD) != 0) { 4299 CTR2(KTR_PMAP, "%s: demoted/removed: pa=%#jx", 4300 __func__, (uintmax_t)PVO_PADDR(pvo)); 4301 PMAP_UNLOCK(pmap); 4302 return (-1); 4303 } 4304 4305 ret = moea64_sp_query_locked(pvo, ptebit); 4306 if ((ret & ptebit) != 0) 4307 count++; 4308 else { 4309 PMAP_UNLOCK(pmap); 4310 return (0); 4311 } 4312 4313 moea64_sp_demote(pvo); 4314 moea64_pte_clear(pvo, ptebit); 4315 4316 /* 4317 * Write protect the mapping to a single page so that a 4318 * subsequent write access may repromote. 4319 */ 4320 if ((pvo->pvo_vaddr & PVO_WIRED) == 0) 4321 moea64_pvo_protect(pmap, pvo, 4322 pvo->pvo_pte.prot & ~VM_PROT_WRITE); 4323 4324 PMAP_UNLOCK(pmap); 4325 } 4326 4327 return (count); 4328} 4329