osfmk/default_pager/default_pager_internal.h

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * @OSF_COPYRIGHT@
  25  */
  26 /*
  27  * Mach Operating System
  28  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  29  * All Rights Reserved.
  30  *
  31  * Permission to use, copy, modify and distribute this software and its
  32  * documentation is hereby granted, provided that both the copyright
  33  * notice and this permission notice appear in all copies of the
  34  * software, derivative works or modified versions, and any portions
  35  * thereof, and that both notices appear in supporting documentation.
  36  *
  37  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  38  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  39  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  40  *
  41  * Carnegie Mellon requests users of this software to return to
  42  *
  43  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  44  *  School of Computer Science
  45  *  Carnegie Mellon University
  46  *  Pittsburgh PA 15213-3890
  47  *
  48  * any improvements or extensions that they make and grant Carnegie Mellon
  49  * the rights to redistribute these changes.
  50  */
  51
  52 /*
  53  *      Default pager.
  54  *              General definitions.
  55  */
  56
  57 #ifndef _DEFAULT_PAGER_INTERNAL_H_
  58 #define _DEFAULT_PAGER_INTERNAL_H_
  59
  60 #include <default_pager/diag.h>
  61 #include <default_pager/default_pager_types.h>
  62 #include <mach/mach_types.h>
  63 #include <ipc/ipc_port.h>
  64 #include <ipc/ipc_types.h>
  65 #include <ipc/ipc_space.h>
  66 #include <kern/lock.h>
  67 #include <kern/kalloc.h>
  68 #include <kern/thread.h>
  69 #include <vm/vm_kern.h>
  70 #include <device/device_types.h>
  71
  72 /*
  73  * Default option settings.
  74  */
  75 #ifndef PARALLEL
  76 #define PARALLEL        1
  77 #endif
  78
  79 #ifndef CHECKSUM
  80 #define CHECKSUM        0
  81 #endif
  82
  83 #define MACH_PORT_FACE mach_port_t
  84
  85 #if 0
  86 #ifndef USE_PRECIOUS
  87 #define USE_PRECIOUS    TRUE
  88 #endif
  89 #endif
  90
  91 #ifdef  USER_PAGER
  92 #define UP(stuff)       stuff
  93 #else   /* USER_PAGER */
  94 #define UP(stuff)
  95 #endif  /* USER_PAGER */
  96
  97 #ifndef MACH_KERNEL
  98 extern struct mutex dprintf_lock;
  99 #define PRINTF_LOCK_INIT()      mutex_init(&dprintf_lock)
 100 #define PRINTF_LOCK()           mutex_lock(&dprintf_lock)
 101 #define PRINTF_UNLOCK()         mutex_unlock(&dprintf_lock)
 102 #endif
 103
 104 #ifndef MACH_KERNEL
 105 #define dprintf(args)                                                   \
 106         do {                                                            \
 107                 PRINTF_LOCK();                                          \
 108                 printf("%s[%d]: ", my_name, dp_thread_id());            \
 109                 printf args;                                            \
 110                 PRINTF_UNLOCK();                                        \
 111         } while (0)
 112 #else
 113 #define dprintf(args)                                           \
 114         do {                                                    \
 115                 printf("%s[KERNEL]: ", my_name);                \
 116                 printf args;                                    \
 117         } while (0)
 118 #endif
 119
 120 /*
 121  * Debug.
 122  */
 123 __private_extern__ char my_name[];
 124
 125 #define DEFAULT_PAGER_DEBUG     0
 126
 127 #if     DEFAULT_PAGER_DEBUG
 128
 129 extern int      debug_mask;
 130 #define DEBUG_MSG_EXTERNAL      0x00000001
 131 #define DEBUG_MSG_INTERNAL      0x00000002
 132 #define DEBUG_MO_EXTERNAL       0x00000100
 133 #define DEBUG_MO_INTERNAL       0x00000200
 134 #define DEBUG_VS_EXTERNAL       0x00010000
 135 #define DEBUG_VS_INTERNAL       0x00020000
 136 #define DEBUG_BS_EXTERNAL       0x01000000
 137 #define DEBUG_BS_INTERNAL       0x02000000
 138
 139 #define DP_DEBUG(level, args)                                           \
 140         do {                                                            \
 141                 if (debug_mask & (level))                               \
 142                         dprintf(args);                                  \
 143         } while (0)
 144
 145 #define ASSERT(expr)                                                    \
 146         do {                                                            \
 147                 if (!(expr))                                            \
 148 #ifndef MACH_KERNEL
 149                         panic("%s[%d]%s: assertion failed in %s line %d: %s",\
 150                               my_name, dp_thread_id(), here,            \
 151                               __FILE__, __LINE__, # expr);              \
 152 #else
 153                   panic("%s[KERNEL]: assertion failed in %s line %d: %s",\
 154                               my_name, __FILE__, __LINE__, # expr); \
 155 #endif
 156         } while (0)
 157
 158 #else   /* DEFAULT_PAGER_DEBUG */
 159
 160 #define DP_DEBUG(level, args)
 161 #define ASSERT(clause)
 162
 163 #endif  /* DEFAULT_PAGER_DEBUG */
 164
 165 #ifndef MACH_KERNEL
 166 extern char *mach_error_string(kern_return_t);
 167 #endif
 168
 169 #define MIN(a,b)        (((a) < (b)) ? (a) : (b))
 170
 171 #define PAGER_SUCCESS   0
 172 #define PAGER_FULL      1
 173 #define PAGER_ERROR     2
 174
 175 /*
 176  * VM and IPC globals.
 177  */
 178 #ifdef MACH_KERNEL
 179 #define vm_page_size page_size
 180 #else
 181 extern vm_object_size_t vm_page_size;
 182 #endif
 183 extern unsigned long long       vm_page_mask;
 184 extern int              vm_page_shift;
 185
 186 #ifndef MACH_KERNEL
 187 #define ptoa(p) ((p)*vm_page_size)
 188 #define atop(a) ((a)/vm_page_size)
 189 #endif
 190 #define howmany(a,b)    (((a) + (b) - 1)/(b))
 191
 192 extern memory_object_default_t  default_pager_object;
 193
 194 #ifdef MACH_KERNEL
 195 extern mutex_t          dpt_lock;       /* Lock for the dpt array */
 196 extern int      default_pager_internal_count;
 197 extern MACH_PORT_FACE   default_pager_host_port;
 198 /* extern task_t                default_pager_self; */  /* dont need or want */
 199 extern MACH_PORT_FACE   default_pager_internal_set;
 200 extern MACH_PORT_FACE   default_pager_external_set;
 201 extern MACH_PORT_FACE   default_pager_default_set;
 202 #else
 203 extern mach_port_t      default_pager_host_port;
 204 extern task_port_t      default_pager_self;
 205 extern mach_port_t      default_pager_internal_set;
 206 extern mach_port_t      default_pager_external_set;
 207 extern mach_port_t      default_pager_default_set;
 208 #endif
 209
 210 typedef struct default_pager_thread {
 211 #ifndef MACH_KERNEL
 212         cthread_t       dpt_thread;     /* Server thread. */
 213 #endif
 214         vm_offset_t     dpt_buffer;     /* Read buffer. */
 215         boolean_t       dpt_internal;   /* Do we handle internal objects? */
 216 #ifndef MACH_KERNEL
 217         int             dpt_id;         /* thread id for printf */
 218 #else
 219         int             checked_out;
 220 #endif
 221         boolean_t       dpt_initialized_p; /* Thread is ready for requests.  */
 222 } default_pager_thread_t;
 223
 224 #ifdef MACH_KERNEL
 225 extern default_pager_thread_t   **dpt_array;
 226 #endif
 227
 228 /*
 229  * Global statistics.
 230  */
 231 struct {
 232         unsigned int    gs_pageout_calls;       /* # pageout calls */
 233         unsigned int    gs_pagein_calls;        /* # pagein calls */
 234         unsigned int    gs_pages_in;            /* # pages paged in (total) */
 235         unsigned int    gs_pages_out;           /* # pages paged out (total) */
 236         unsigned int    gs_pages_unavail;       /* # zero-fill pages */
 237         unsigned int    gs_pages_init;          /* # page init requests */
 238         unsigned int    gs_pages_init_writes;   /* # page init writes */
 239         VSTATS_LOCK_DECL(gs_lock)
 240 } global_stats;
 241 #define GSTAT(clause)   VSTATS_ACTION(&global_stats.gs_lock, (clause))
 242
 243 /*
 244  * Cluster related definitions.
 245  * Clusters are sized in number of pages per cluster.
 246  * Cluster sizes must be powers of two.
 247  *
 248  * These numbers are related to the struct vs_map,
 249  * defined below.
 250  */
 251 #define MAX_CLUSTER_SIZE 8
 252 #define MAX_CLUSTER_SHIFT 3
 253 #define NO_CLSIZE 0
 254
 255 /*
 256  * bit map related macros
 257  */
 258 #define NBBY            8       /* bits per byte XXX */
 259 #define BYTEMASK        0xff
 260 #define setbit(a,i)     (*(((char *)(a)) + ((i)/NBBY)) |= 1<<((i)%NBBY))
 261 #define clrbit(a,i)     (*(((char *)(a)) + ((i)/NBBY)) &= ~(1<<((i)%NBBY)))
 262 #define isset(a,i)      (*(((char *)(a)) + ((i)/NBBY)) & (1<<((i)%NBBY)))
 263 #define isclr(a,i)      ((*(((char *)(a)) + ((i)/NBBY)) & (1<<((i)%NBBY))) == 0)
 264
 265 /*
 266  *      Default Pager.
 267  *              Backing Store Management.
 268  */
 269
 270 #define BS_MAXPRI       4
 271 #define BS_MINPRI       0
 272 #define BS_NOPRI        -1
 273 #define BS_FULLPRI      -2
 274
 275 /*
 276  * Mapping between backing store port and backing store object.
 277  */
 278 struct backing_store {
 279         queue_chain_t   bs_links;       /* link in backing_store_list */
 280 #ifdef MACH_KERNEL
 281         mutex_t         bs_lock;        /* lock for the structure */
 282 #else
 283         struct mutex    bs_lock;        /* lock for the structure */
 284 #endif
 285         MACH_PORT_FACE  bs_port;        /* backing store port */
 286         int             bs_priority;
 287         int             bs_clsize;      /* cluster size in pages */
 288
 289         /* statistics */
 290         unsigned int    bs_pages_free;          /* # unallocated pages */
 291         unsigned int    bs_pages_total;         /* # pages (total) */
 292         unsigned int    bs_pages_in;            /* # page read requests */
 293         unsigned int    bs_pages_in_fail;       /* # page read errors */
 294         unsigned int    bs_pages_out;           /* # page write requests */
 295         unsigned int    bs_pages_out_fail;      /* # page write errors */
 296 };
 297 typedef struct backing_store    *backing_store_t;
 298 #define BACKING_STORE_NULL      ((backing_store_t) 0)
 299 #define BS_STAT(bs, clause)     VSTATS_ACTION(&(bs)->bs_lock, (clause))
 300
 301 #ifdef MACH_KERNEL
 302 #define BS_LOCK_INIT(bs)        mutex_init(&(bs)->bs_lock, 0)
 303 #else
 304 #define BS_LOCK_INIT(bs)        mutex_init(&(bs)->bs_lock)
 305 #endif
 306 #define BS_LOCK(bs)             mutex_lock(&(bs)->bs_lock)
 307 #define BS_UNLOCK(bs)           mutex_unlock(&(bs)->bs_lock)
 308
 309 struct backing_store_list_head {
 310         queue_head_t    bsl_queue;
 311 #ifdef MACH_KERNEL
 312         mutex_t         bsl_lock;
 313 #else
 314         struct mutex    bsl_lock;
 315 #endif
 316 };
 317 extern struct backing_store_list_head   backing_store_list;
 318 extern int      backing_store_release_trigger_disable;
 319
 320 #ifdef MACH_KERNEL
 321 #define BSL_LOCK_INIT() mutex_init(&backing_store_list.bsl_lock, 0)
 322 #else
 323 #define BSL_LOCK_INIT() mutex_init(&backing_store_list.bsl_lock)
 324 #endif
 325 #define BSL_LOCK()      mutex_lock(&backing_store_list.bsl_lock)
 326 #define BSL_UNLOCK()    mutex_unlock(&backing_store_list.bsl_lock)
 327
 328 /*
 329  *      Paging segment management.
 330  *      Controls allocation of blocks within paging area.
 331  */
 332 struct paging_segment {
 333         /* device management */
 334         union {
 335                 MACH_PORT_FACE  dev;            /* Port to device */
 336                 struct vnode    *vnode;         /* vnode for bs file */
 337         } storage_type;
 338         unsigned int    ps_segtype;     /* file type or partition */
 339         MACH_PORT_FACE  ps_device;      /* Port to device */
 340         vm_offset_t     ps_offset;      /* Offset of segment within device */
 341         vm_offset_t     ps_recnum;      /* Number of device records in segment*/
 342         unsigned int    ps_pgnum;       /* Number of pages in segment */
 343         unsigned int    ps_record_shift;/* Bit shift: pages to device records */
 344
 345         /* clusters and pages */
 346         unsigned int    ps_clshift;     /* Bit shift: clusters to pages */
 347         unsigned int    ps_ncls;        /* Number of clusters in segment */
 348         unsigned int    ps_clcount;     /* Number of free clusters */
 349         unsigned int    ps_pgcount;     /* Number of free pages */
 350         unsigned long   ps_hint;        /* Hint of where to look next. */
 351
 352         /* bitmap */
 353 #ifdef MACH_KERNEL
 354         mutex_t         ps_lock;        /* Lock for contents of struct */
 355 #else
 356         struct mutex    ps_lock;        /* Lock for contents of struct */
 357 #endif
 358         unsigned char   *ps_bmap;       /* Map of used clusters */
 359
 360         /* backing store */
 361         backing_store_t ps_bs;          /* Backing store segment belongs to */
 362
 363         boolean_t       ps_going_away;  /* Destroy attempt in progress */
 364 };
 365
 366 #define ps_vnode        storage_type.vnode
 367 #define ps_device       storage_type.dev
 368 #define PS_PARTITION 1
 369 #define PS_FILE 2
 370
 371 typedef struct paging_segment *paging_segment_t;
 372
 373 #define PAGING_SEGMENT_NULL     ((paging_segment_t) 0)
 374
 375 #ifdef MACH_KERNEL
 376 #define PS_LOCK_INIT(ps)        mutex_init(&(ps)->ps_lock, 0)
 377 #else
 378 #define PS_LOCK_INIT(ps)        mutex_init(&(ps)->ps_lock)
 379 #endif
 380 #define PS_LOCK(ps)             mutex_lock(&(ps)->ps_lock)
 381 #define PS_UNLOCK(ps)           mutex_unlock(&(ps)->ps_lock)
 382
 383 typedef unsigned int    pseg_index_t;
 384
 385 #define INVALID_PSEG_INDEX      ((pseg_index_t)-1)
 386 #define NULL_PSEG_INDEX         ((pseg_index_t) 0)
 387 /*
 388  * MAX_PSEG_INDEX value is related to struct vs_map below.
 389  * "0" is reserved for empty map entries (no segment).
 390  */
 391 #define MAX_PSEG_INDEX  63      /* 0 is reserved for empty map */
 392 #define MAX_NUM_PAGING_SEGMENTS MAX_PSEG_INDEX
 393
 394 /* paging segments array */
 395 extern paging_segment_t paging_segments[MAX_NUM_PAGING_SEGMENTS];
 396 #ifdef MACH_KERNEL
 397 extern mutex_t paging_segments_lock;
 398 #else
 399 extern struct mutex paging_segments_lock;
 400 #endif
 401 extern int      paging_segment_count;   /* number of active paging segments */
 402 extern int      paging_segment_max;     /* highest used paging segment index */
 403 extern int ps_select_array[DEFAULT_PAGER_BACKING_STORE_MAXPRI+1];
 404
 405 #ifdef MACH_KERNEL
 406 #define PSL_LOCK_INIT() mutex_init(&paging_segments_lock, 0)
 407 #else
 408 #define PSL_LOCK_INIT() mutex_init(&paging_segments_lock)
 409 #endif
 410 #define PSL_LOCK()      mutex_lock(&paging_segments_lock)
 411 #define PSL_UNLOCK()    mutex_unlock(&paging_segments_lock)
 412
 413 /*
 414  * Vstruct manipulation.  The vstruct is the pager's internal
 415  * representation of vm objects it manages.  There is one vstruct allocated
 416  * per vm object.
 417  *
 418  * The following data structures are defined for vstruct and vm object
 419  * management.
 420  */
 421
 422 /*
 423  * vs_map
 424  * A structure used only for temporary objects.  It is the element
 425  * contained in the vs_clmap structure, which contains information
 426  * about which clusters and pages in an object are present on backing
 427  * store (a paging file).
 428  * Note that this structure and its associated constants may change
 429  * with minimal impact on code.  The only function which knows the
 430  * internals of this structure is ps_clmap().
 431  *
 432  * If it is necessary to change the maximum number of paging segments
 433  * or pages in a cluster, then this structure is the one most
 434  * affected.   The constants and structures which *may* change are:
 435  *      MAX_CLUSTER_SIZE
 436  *      MAX_CLUSTER_SHIFT
 437  *      MAX_NUM_PAGING_SEGMENTS
 438  *      VSTRUCT_DEF_CLSHIFT
 439  *      struct vs_map and associated macros and constants (VSM_*)
 440  *        (only the macro definitions need change, the exported (inside the
 441  *         pager only) interfaces remain the same; the constants are for
 442  *         internal vs_map manipulation only).
 443  *      struct clbmap (below).
 444  */
 445 struct vs_map {
 446         unsigned int    vsmap_entry:23,         /* offset in paging segment */
 447                         vsmap_psindex:8,        /* paging segment */
 448                         vsmap_error:1,
 449                         vsmap_bmap:16,
 450                         vsmap_alloc:16;
 451 };
 452
 453 typedef struct vs_map *vs_map_t;
 454
 455
 456 #define VSM_ENTRY_NULL  0x7fffff
 457
 458 /*
 459  * Exported macros for manipulating the vs_map structure --
 460  * checking status, getting and setting bits.
 461  */
 462 #define VSCLSIZE(vs)            (1UL << (vs)->vs_clshift)
 463 #define VSM_ISCLR(vsm)          (((vsm).vsmap_entry == VSM_ENTRY_NULL) &&   \
 464                                         ((vsm).vsmap_error == 0))
 465 #define VSM_ISERR(vsm)          ((vsm).vsmap_error)
 466 #define VSM_SETCLOFF(vsm, val)  ((vsm).vsmap_entry = (val))
 467 #define VSM_SETERR(vsm, err)    ((vsm).vsmap_error = 1,   \
 468                                         (vsm).vsmap_entry = (err))
 469 #define VSM_GETERR(vsm)         ((vsm).vsmap_entry)
 470 #define VSM_SETPG(vsm, page)    ((vsm).vsmap_bmap |= (1 << (page)))
 471 #define VSM_CLRPG(vsm, page)    ((vsm).vsmap_bmap &= ~(1 << (page)))
 472 #define VSM_SETPS(vsm, psindx)  ((vsm).vsmap_psindex = (psindx))
 473 #define VSM_PSINDEX(vsm)        ((vsm).vsmap_psindex)
 474 #define VSM_PS(vsm)             paging_segments[(vsm).vsmap_psindex]
 475 #define VSM_BMAP(vsm)           ((vsm).vsmap_bmap)
 476 #define VSM_CLOFF(vsm)          ((vsm).vsmap_entry)
 477 #define VSM_CLR(vsm)            ((vsm).vsmap_entry = VSM_ENTRY_NULL,   \
 478                                         (vsm).vsmap_psindex = 0,   \
 479                                         (vsm).vsmap_error = 0,     \
 480                                         (vsm).vsmap_bmap = 0,      \
 481                                         (vsm).vsmap_alloc = 0)
 482 #define VSM_ALLOC(vsm)          ((vsm).vsmap_alloc)
 483 #define VSM_SETALLOC(vsm, page) ((vsm).vsmap_alloc |= (1 << (page)))
 484 #define VSM_CLRALLOC(vsm, page) ((vsm).vsmap_alloc &= ~(1 << (page)))
 485
 486 /*
 487  * Constants and macros for dealing with vstruct maps,
 488  * which comprise vs_map structures, which
 489  * map vm objects to backing storage (paging files and clusters).
 490  */
 491 #define CLMAP_THRESHOLD 512     /* bytes */
 492 #define CLMAP_ENTRIES           (CLMAP_THRESHOLD/sizeof(struct vs_map))
 493 #define CLMAP_SIZE(ncls)        (ncls*sizeof(struct vs_map))
 494
 495 #define INDIRECT_CLMAP_ENTRIES(ncls) (((ncls-1)/CLMAP_ENTRIES) + 1)
 496 #define INDIRECT_CLMAP_SIZE(ncls) (INDIRECT_CLMAP_ENTRIES(ncls) * sizeof(struct vs_map *))
 497 #define INDIRECT_CLMAP(size)    (CLMAP_SIZE(size) > CLMAP_THRESHOLD)
 498
 499 #define RMAPSIZE(blocks)        (howmany(blocks,NBBY))
 500
 501 #define CL_FIND 1
 502 #define CL_ALLOC 2
 503
 504 /*
 505  * clmap
 506  *
 507  * A cluster map returned by ps_clmap.  It is an abstracted cluster of
 508  * pages.  It gives the caller information about the cluster
 509  * desired.  On read it tells the caller if a cluster is mapped, and if so,
 510  * which of its pages are valid.  It should not be referenced directly,
 511  * except by  ps_clmap; macros should be used.  If the number of pages
 512  * in a cluster needs to be more than 32, then the struct clbmap must
 513  * become larger.
 514  */
 515 struct clbmap {
 516         unsigned int    clb_map;
 517 };
 518
 519 struct clmap {
 520         paging_segment_t cl_ps;         /* paging segment backing cluster */
 521         int             cl_numpages;    /* number of valid pages */
 522         struct clbmap   cl_bmap;        /* map of pages in cluster */
 523         int             cl_error;       /* cluster error value */
 524         struct clbmap   cl_alloc;       /* map of allocated pages in cluster */
 525 };
 526
 527 #define  CLMAP_ERROR(clm)       (clm).cl_error
 528 #define  CLMAP_PS(clm)          (clm).cl_ps
 529 #define  CLMAP_NPGS(clm)        (clm).cl_numpages
 530 #define  CLMAP_ISSET(clm,i)     ((1<<(i))&((clm).cl_bmap.clb_map))
 531 #define  CLMAP_ALLOC(clm)       (clm).cl_alloc.clb_map
 532 /*
 533  * Shift off unused bits in a partial cluster
 534  */
 535 #define  CLMAP_SHIFT(clm,vs)    \
 536         (clm)->cl_bmap.clb_map >>= (VSCLSIZE(vs) - (clm)->cl_numpages)
 537 #define  CLMAP_SHIFTALLOC(clm,vs)       \
 538         (clm)->cl_alloc.clb_map >>= (VSCLSIZE(vs) - (clm)->cl_numpages)
 539
 540 typedef struct vstruct_alias {
 541         int *name;
 542         struct vstruct *vs;
 543 } vstruct_alias_t;
 544
 545 #ifdef MACH_KERNEL
 546 #define DPT_LOCK_INIT(lock)     mutex_init(&(lock), 0)
 547 #define DPT_LOCK(lock)          mutex_lock(&(lock))
 548 #define DPT_UNLOCK(lock)        mutex_unlock(&(lock))
 549 #define DPT_SLEEP(lock, e, i)   thread_sleep_mutex(&(lock), (event_t)(e), i)
 550 #define VS_LOCK_TYPE            hw_lock_data_t
 551 #define VS_LOCK_INIT(vs)        hw_lock_init(&(vs)->vs_lock)
 552 #define VS_TRY_LOCK(vs)         (VS_LOCK(vs),TRUE)
 553 #define VS_LOCK(vs)             hw_lock_lock(&(vs)->vs_lock)
 554 #define VS_UNLOCK(vs)           hw_lock_unlock(&(vs)->vs_lock)
 555 #define VS_MAP_LOCK_TYPE        mutex_t
 556 #define VS_MAP_LOCK_INIT(vs)    mutex_init(&(vs)->vs_map_lock, 0)
 557 #define VS_MAP_LOCK(vs)         mutex_lock(&(vs)->vs_map_lock)
 558 #define VS_MAP_TRY_LOCK(vs)     mutex_try(&(vs)->vs_map_lock)
 559 #define VS_MAP_UNLOCK(vs)       mutex_unlock(&(vs)->vs_map_lock)
 560 #else
 561 #define VS_LOCK_TYPE            struct mutex
 562 #define VS_LOCK_INIT(vs)        mutex_init(&(vs)->vs_lock, 0)
 563 #define VS_TRY_LOCK(vs)         mutex_try(&(vs)->vs_lock)
 564 #define VS_LOCK(vs)             mutex_lock(&(vs)->vs_lock)
 565 #define VS_UNLOCK(vs)           mutex_unlock(&(vs)->vs_lock)
 566 #define VS_MAP_LOCK_TYPE        struct mutex
 567 #define VS_MAP_LOCK_INIT(vs)    mutex_init(&(vs)->vs_map_lock)
 568 #define VS_MAP_LOCK(vs)         mutex_lock(&(vs)->vs_map_lock)
 569 #define VS_MAP_TRY_LOCK(vs)     mutex_try(&(vs)->vs_map_lock)
 570 #define VS_MAP_UNLOCK(vs)       mutex_unlock(&(vs)->vs_map_lock)
 571 #endif
 572
 573
 574 /*
 575  * VM Object Structure:  This is the structure used to manage
 576  * default pager object associations with their control counter-
 577  * parts (VM objects).
 578  */
 579 typedef struct vstruct {
 580         int                     *vs_mem_obj;    /* our memory obj - temp */
 581         int                     vs_mem_obj_ikot;/* JMM:fake ip_kotype() */
 582         memory_object_control_t vs_control;     /* our mem obj control ref */
 583         VS_LOCK_TYPE            vs_lock;        /* data for the lock */
 584
 585         /* JMM - Could combine these first two in a single pending count now */
 586         unsigned int            vs_next_seqno;  /* next sequence num to issue */
 587         unsigned int            vs_seqno;       /* Pager port sequence number */
 588         unsigned int            vs_readers;     /* Reads in progress */
 589         unsigned int            vs_writers;     /* Writes in progress */
 590
 591 #ifdef MACH_KERNEL
 592         int
 593         /* boolean_t */         vs_waiting_seqno:1,     /* to wait on seqno */
 594         /* boolean_t */         vs_waiting_read:1,      /* waiting on reader? */
 595         /* boolean_t */         vs_waiting_write:1,     /* waiting on writer? */
 596         /* boolean_t */         vs_waiting_async:1,     /* waiting on async? */
 597         /* boolean_t */         vs_indirect:1,          /* map indirect? */
 598         /* boolean_t */         vs_xfer_pending:1;      /* xfer out of seg? */
 599 #else
 600         event_t                 vs_waiting_seqno;/* to wait on seqno */
 601         event_t                 vs_waiting_read; /* to wait on readers */
 602         event_t                 vs_waiting_write;/* to wait on writers */
 603         event_t                 vs_waiting_async;/* to wait on async_pending */
 604         int                     vs_indirect:1,  /* Is the map indirect ? */
 605                                 vs_xfer_pending:1; /* xfering out of a seg ? */
 606 #endif
 607
 608         unsigned int            vs_async_pending;/* pending async write count */
 609         unsigned int            vs_errors;      /* Pageout error count */
 610         unsigned int            vs_references;  /* references */
 611
 612         queue_chain_t           vs_links;       /* Link in pager-wide list */
 613
 614         unsigned int            vs_clshift;     /* Bit shift: clusters->pages */
 615         unsigned int            vs_size;        /* Object size in clusters */
 616 #ifdef MACH_KERNEL
 617         mutex_t         vs_map_lock;    /* to protect map below */
 618 #else
 619         struct mutex    vs_map_lock;    /* to protect map below */
 620 #endif
 621         union {
 622                 struct vs_map   *vsu_dmap;      /* Direct map of clusters */
 623                 struct vs_map   **vsu_imap;     /* Indirect map of clusters */
 624         } vs_un;
 625 } *vstruct_t;
 626
 627 #define vs_dmap vs_un.vsu_dmap
 628 #define vs_imap vs_un.vsu_imap
 629
 630 #define VSTRUCT_NULL    ((vstruct_t) 0)
 631
 632 __private_extern__ void vs_async_wait(vstruct_t);
 633
 634 #if PARALLEL
 635 __private_extern__ void vs_lock(vstruct_t);
 636 __private_extern__ void vs_unlock(vstruct_t);
 637 __private_extern__ void vs_start_read(vstruct_t);
 638 __private_extern__ void vs_finish_read(vstruct_t);
 639 __private_extern__ void vs_wait_for_readers(vstruct_t);
 640 __private_extern__ void vs_start_write(vstruct_t);
 641 __private_extern__ void vs_finish_write(vstruct_t);
 642 __private_extern__ void vs_wait_for_writers(vstruct_t);
 643 __private_extern__ void vs_wait_for_sync_writers(vstruct_t);
 644 #else   /* PARALLEL */
 645 #define vs_lock(vs)
 646 #define vs_unlock(vs)
 647 #define vs_start_read(vs)
 648 #define vs_wait_for_readers(vs)
 649 #define vs_finish_read(vs)
 650 #define vs_start_write(vs)
 651 #define vs_wait_for_writers(vs)
 652 #define vs_wait_for_sync_writers(vs)
 653 #define vs_finish_write(vs)
 654 #endif /* PARALLEL */
 655
 656 /*
 657  * Data structures and variables dealing with asynchronous
 658  * completion of paging operations.
 659  */
 660 /*
 661  * vs_async
 662  *      A structure passed to ps_write_device for asynchronous completions.
 663  *      It contains enough information to complete the write and
 664  *      inform the VM of its completion.
 665  */
 666 struct vs_async {
 667         struct vs_async *vsa_next;      /* pointer to next structure */
 668         vstruct_t       vsa_vs;         /* the vstruct for the object */
 669         vm_offset_t     vsa_addr;       /* the vaddr of the data moved */
 670         vm_offset_t     vsa_offset;     /* the object offset of the data */
 671         vm_size_t       vsa_size;       /* the number of bytes moved */
 672         paging_segment_t vsa_ps;        /* the paging segment used */
 673         int             vsa_flags;      /* flags */
 674         int             vsa_error;      /* error, if there is one */
 675         mutex_t         vsa_lock;
 676         MACH_PORT_FACE  reply_port;     /* associated reply port */
 677 };
 678
 679 /*
 680  * flags values.
 681  */
 682 #define VSA_READ        0x0001
 683 #define VSA_WRITE       0x0002
 684 #define VSA_TRANSFER    0x0004
 685
 686 /*
 687  * List of all vstructs.  A specific vstruct is
 688  * found directly via its port, this list is
 689  * only used for monitoring purposes by the
 690  * default_pager_object* calls
 691  */
 692 struct vstruct_list_head {
 693         queue_head_t    vsl_queue;
 694 #ifdef MACH_KERNEL
 695         mutex_t         vsl_lock;
 696 #else
 697         struct mutex    vsl_lock;
 698 #endif
 699         int             vsl_count;      /* saves code */
 700 };
 701
 702 __private_extern__ struct vstruct_list_head     vstruct_list;
 703
 704 __private_extern__ void vstruct_list_insert(vstruct_t vs);
 705 __private_extern__ void vstruct_list_delete(vstruct_t vs);
 706
 707
 708 #ifdef MACH_KERNEL
 709 #define VSL_LOCK_INIT() mutex_init(&vstruct_list.vsl_lock, 0)
 710 #else
 711 #define VSL_LOCK_INIT() mutex_init(&vstruct_list.vsl_lock)
 712 #endif
 713 #define VSL_LOCK()      mutex_lock(&vstruct_list.vsl_lock)
 714 #define VSL_LOCK_TRY()  mutex_try(&vstruct_list.vsl_lock)
 715 #define VSL_UNLOCK()    mutex_unlock(&vstruct_list.vsl_lock)
 716 #define VSL_SLEEP(e,i)  thread_sleep_mutex((e), &vstruct_list.vsl_lock, (i))
 717
 718 #ifdef MACH_KERNEL
 719 __private_extern__ zone_t       vstruct_zone;
 720 #endif
 721
 722 /*
 723  * Create port alias for vstruct address.
 724  *
 725  * We assume that the last two bits of a vstruct address will be zero due to
 726  * memory allocation restrictions, hence are available for use as a sanity
 727  * check.
 728  */
 729 #ifdef MACH_KERNEL
 730
 731 #define ISVS ((int *)123456)
 732 #define mem_obj_is_vs(_mem_obj_)                                        \
 733         (((_mem_obj_) != NULL) && ((_mem_obj_)->pager == ISVS))
 734 #define mem_obj_to_vs(_mem_obj_)                                        \
 735         ((vstruct_t)(_mem_obj_))
 736 #define vs_to_mem_obj(_vs_) ((memory_object_t)(_vs_))
 737 #define vs_lookup(_mem_obj_, _vs_)                                      \
 738         do {                                                            \
 739         if (!mem_obj_is_vs(_mem_obj_))                                  \
 740                 panic("bad dp memory object");                          \
 741         _vs_ = mem_obj_to_vs(_mem_obj_);                                \
 742         } while (0)
 743 #define vs_lookup_safe(_mem_obj_, _vs_)                                 \
 744         do {                                                            \
 745         if (!mem_obj_is_vs(_mem_obj_))                                  \
 746                 _vs_ = VSTRUCT_NULL;                                    \
 747         else                                                            \
 748                 _vs_ = mem_obj_to_vs(_mem_obj_);                        \
 749         } while (0)
 750 #else
 751
 752 #define vs_to_port(_vs_)        (((vm_offset_t)(_vs_))+1)
 753 #define port_to_vs(_port_)      ((vstruct_t)(((vm_offset_t)(_port_))&~3))
 754 #define port_is_vs(_port_)      ((((vm_offset_t)(_port_))&3) == 1)
 755
 756 #define vs_lookup(_port_, _vs_)                                         \
 757         do {                                                            \
 758                 if (!MACH_PORT_VALID(_port_) || !port_is_vs(_port_)     \
 759                     || port_to_vs(_port_)->vs_mem_obj != (_port_))      \
 760                         Panic("bad pager port");                        \
 761                 _vs_ = port_to_vs(_port_);                              \
 762         } while (0)
 763 #endif
 764
 765 /*
 766  * Cross-module routines declaration.
 767  */
 768 #ifndef MACH_KERNEL
 769 extern int              dp_thread_id(void);
 770 #endif
 771 extern boolean_t        device_reply_server(mach_msg_header_t *,
 772                                             mach_msg_header_t *);
 773 #ifdef MACH_KERNEL
 774 extern boolean_t        default_pager_no_senders(memory_object_t,
 775                                                  mach_port_mscount_t);
 776 #else
 777 extern void             default_pager_no_senders(memory_object_t,
 778                                                  mach_port_seqno_t,
 779                                                  mach_port_mscount_t);
 780 #endif
 781
 782 extern int              local_log2(unsigned int);
 783 extern void             bs_initialize(void);
 784 extern void             bs_global_info(vm_size_t *,
 785                                        vm_size_t *);
 786 extern boolean_t        bs_add_device(char *,
 787                                       MACH_PORT_FACE);
 788 extern vstruct_t        ps_vstruct_create(vm_size_t);
 789 extern void             ps_vstruct_dealloc(vstruct_t);
 790 extern kern_return_t    pvs_cluster_read(vstruct_t,
 791                                         vm_offset_t,
 792                                         vm_size_t);
 793 extern kern_return_t    vs_cluster_write(vstruct_t,
 794                                          upl_t,
 795                                          upl_offset_t,
 796                                          upl_size_t,
 797                                          boolean_t,
 798                                          int);
 799 extern vm_offset_t      ps_clmap(vstruct_t,
 800                                  vm_offset_t,
 801                                  struct clmap *,
 802                                  int,
 803                                  vm_size_t,
 804                                  int);
 805 extern vm_size_t        ps_vstruct_allocated_size(vstruct_t);
 806 extern size_t           ps_vstruct_allocated_pages(vstruct_t,
 807                                                    default_pager_page_t *,
 808                                                    size_t);
 809 extern boolean_t        bs_set_default_clsize(unsigned int);
 810
 811 extern boolean_t        verbose;
 812
 813 extern thread_call_t    default_pager_backing_store_monitor_callout;
 814 extern void             default_pager_backing_store_monitor(thread_call_param_t, thread_call_param_t);
 815
 816 extern ipc_port_t       max_pages_trigger_port;
 817 extern unsigned int     dp_pages_free;
 818 extern unsigned int     maximum_pages_free;
 819
 820 /* Do we know yet if swap files need to be encrypted ? */
 821 extern boolean_t        dp_encryption_inited;
 822 /* Should we encrypt data before writing to swap ? */
 823 extern boolean_t        dp_encryption;
 824
 825 #endif  /* _DEFAULT_PAGER_INTERNAL_H_ */