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1 jermar 1
/*
564 jermar 2
 * Copyright (C) 2001-2005 Jakub Jermar
3
 * Copyright (C) 2005 Sergey Bondari
1 jermar 4
 * All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 *
10
 * - Redistributions of source code must retain the above copyright
11
 *   notice, this list of conditions and the following disclaimer.
12
 * - Redistributions in binary form must reproduce the above copyright
13
 *   notice, this list of conditions and the following disclaimer in the
14
 *   documentation and/or other materials provided with the distribution.
15
 * - The name of the author may not be used to endorse or promote products
16
 *   derived from this software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
 */
29
 
1757 jermar 30
/** @addtogroup genericmm
1702 cejka 31
 * @{
32
 */
33
 
1248 jermar 34
/**
1702 cejka 35
 * @file
1248 jermar 36
 * @brief   Physical frame allocator.
37
 *
38
 * This file contains the physical frame allocator and memory zone management.
39
 * The frame allocator is built on top of the buddy allocator.
40
 *
41
 * @see buddy.c
42
 */
43
 
814 palkovsky 44
/*
45
 * Locking order
46
 *
47
 * In order to access particular zone, the process must first lock
48
 * the zones.lock, then lock the zone and then unlock the zones.lock.
49
 * This insures, that we can fiddle with the zones in runtime without
50
 * affecting the processes.
51
 *
52
 */
53
 
368 jermar 54
#include <typedefs.h>
1 jermar 55
#include <arch/types.h>
56
#include <mm/frame.h>
703 jermar 57
#include <mm/as.h>
1 jermar 58
#include <panic.h>
367 jermar 59
#include <debug.h>
788 jermar 60
#include <adt/list.h>
1 jermar 61
#include <synch/spinlock.h>
115 jermar 62
#include <arch/asm.h>
195 vana 63
#include <arch.h>
533 bondari 64
#include <print.h>
536 bondari 65
#include <align.h>
814 palkovsky 66
#include <mm/slab.h>
822 palkovsky 67
#include <bitops.h>
1063 palkovsky 68
#include <macros.h>
115 jermar 69
 
814 palkovsky 70
typedef struct {
71
    count_t refcount;   /**< tracking of shared frames  */
72
    __u8 buddy_order;   /**< buddy system block order */
73
    link_t buddy_link;  /**< link to the next free block inside one order */
74
    void *parent;           /**< If allocated by slab, this points there */
1236 jermar 75
} frame_t;
367 jermar 76
 
814 palkovsky 77
typedef struct {
78
    SPINLOCK_DECLARE(lock); /**< this lock protects everything below */
1236 jermar 79
    pfn_t base;     /**< frame_no of the first frame in the frames array */
820 jermar 80
    count_t count;          /**< Size of zone */
533 bondari 81
 
814 palkovsky 82
    frame_t *frames;    /**< array of frame_t structures in this zone */
83
    count_t free_count; /**< number of free frame_t structures */
84
    count_t busy_count; /**< number of busy frame_t structures */
85
 
86
    buddy_system_t * buddy_system; /**< buddy system for the zone */
87
    int flags;
1236 jermar 88
} zone_t;
479 bondari 89
 
814 palkovsky 90
/*
91
 * The zoneinfo.lock must be locked when accessing zoneinfo structure.
92
 * Some of the attributes in zone_t structures are 'read-only'
368 jermar 93
 */
1 jermar 94
 
814 palkovsky 95
struct {
96
    SPINLOCK_DECLARE(lock);
97
    int count;
98
    zone_t *info[ZONES_MAX];
1236 jermar 99
} zones;
1 jermar 100
 
814 palkovsky 101
 
102
/*********************************/
103
/* Helper functions */
104
static inline index_t frame_index(zone_t *zone, frame_t *frame)
762 palkovsky 105
{
814 palkovsky 106
    return (index_t)(frame - zone->frames);
762 palkovsky 107
}
814 palkovsky 108
static inline index_t frame_index_abs(zone_t *zone, frame_t *frame)
1 jermar 109
{
814 palkovsky 110
    return (index_t)(frame - zone->frames) + zone->base;
1 jermar 111
}
814 palkovsky 112
static inline int frame_index_valid(zone_t *zone, index_t index)
113
{
114
    return index >= 0 && index < zone->count;
115
}
1 jermar 116
 
814 palkovsky 117
/** Compute pfn_t from frame_t pointer & zone pointer */
820 jermar 118
static index_t make_frame_index(zone_t *zone, frame_t *frame)
762 palkovsky 119
{
814 palkovsky 120
    return frame - zone->frames;
762 palkovsky 121
}
122
 
814 palkovsky 123
/** Initialize frame structure
762 palkovsky 124
 *
814 palkovsky 125
 * Initialize frame structure.
126
 *
127
 * @param frame Frame structure to be initialized.
762 palkovsky 128
 */
814 palkovsky 129
static void frame_initialize(frame_t *frame)
762 palkovsky 130
{
814 palkovsky 131
    frame->refcount = 1;
132
    frame->buddy_order = 0;
762 palkovsky 133
}
134
 
814 palkovsky 135
/*************************************/
136
/* Zoneinfo functions */
762 palkovsky 137
 
814 palkovsky 138
/**
139
 * Insert-sort zone into zones list
822 palkovsky 140
 *
1568 palkovsky 141
 * @param newzone New zone to be inserted into zone list
822 palkovsky 142
 * @return zone number on success, -1 on error
1 jermar 143
 */
822 palkovsky 144
static int zones_add_zone(zone_t *newzone)
1 jermar 145
{
822 palkovsky 146
    int i,j;
147
    ipl_t ipl;
148
    zone_t *z;
762 palkovsky 149
 
822 palkovsky 150
    ipl = interrupts_disable();
814 palkovsky 151
    spinlock_lock(&zones.lock);
152
    /* Try to merge */
1037 decky 153
    if (zones.count + 1 == ZONES_MAX)
822 palkovsky 154
        panic("Maximum zone(%d) count exceeded.", ZONES_MAX);
1037 decky 155
    for (i = 0; i < zones.count; i++) {
822 palkovsky 156
        /* Check for overflow */
852 palkovsky 157
        z = zones.info[i];
822 palkovsky 158
        if (overlaps(newzone->base,newzone->count,
159
                 z->base, z->count)) {
160
            printf("Zones overlap!\n");
161
            return -1;
814 palkovsky 162
        }
852 palkovsky 163
        if (newzone->base < z->base)
822 palkovsky 164
            break;
368 jermar 165
    }
822 palkovsky 166
    /* Move other zones up */
1037 decky 167
    for (j = i;j < zones.count; j++)
168
        zones.info[j + 1] = zones.info[j];
822 palkovsky 169
    zones.info[i] = newzone;
170
    zones.count++;
814 palkovsky 171
    spinlock_unlock(&zones.lock);
822 palkovsky 172
    interrupts_restore(ipl);
173
 
174
    return i;
1 jermar 175
}
176
 
814 palkovsky 177
/**
178
 * Try to find a zone where can we find the frame
368 jermar 179
 *
1568 palkovsky 180
 * @param frame Frame number contained in zone
181
 * @param pzone If not null, it is used as zone hint. Zone index
182
 *              is filled into the variable on success.
183
 * @return Pointer to LOCKED zone containing frame
368 jermar 184
 *
814 palkovsky 185
 * Assume interrupts disable
368 jermar 186
 */
814 palkovsky 187
static zone_t * find_zone_and_lock(pfn_t frame, int *pzone)
1 jermar 188
{
533 bondari 189
    int i;
814 palkovsky 190
    int hint = pzone ? *pzone : 0;
191
    zone_t *z;
533 bondari 192
 
814 palkovsky 193
    spinlock_lock(&zones.lock);
194
 
195
    if (hint >= zones.count || hint < 0)
196
        hint = 0;
533 bondari 197
 
814 palkovsky 198
    i = hint;
199
    do {
200
        z = zones.info[i];
201
        spinlock_lock(&z->lock);
202
        if (z->base <= frame && z->base + z->count > frame) {
203
            spinlock_unlock(&zones.lock); /* Unlock the global lock */
204
            if (pzone)
205
                *pzone = i;
206
            return z;
533 bondari 207
        }
814 palkovsky 208
        spinlock_unlock(&z->lock);
533 bondari 209
 
814 palkovsky 210
        i++;
211
        if (i >= zones.count)
212
            i = 0;
213
    } while(i != hint);
214
 
215
    spinlock_unlock(&zones.lock);
216
    return NULL;
533 bondari 217
}
218
 
822 palkovsky 219
/** @return True if zone can allocate specified order */
220
static int zone_can_alloc(zone_t *z, __u8 order)
221
{
222
    return buddy_system_can_alloc(z->buddy_system, order);
223
}
224
 
814 palkovsky 225
/**
226
 * Find AND LOCK zone that can allocate order frames
367 jermar 227
 *
814 palkovsky 228
 * Assume interrupts are disabled!!
367 jermar 229
 *
1568 palkovsky 230
 * @param order Size (2^order) of free space we are trying to find
814 palkovsky 231
 * @param pzone Pointer to preferred zone or NULL, on return contains zone number
367 jermar 232
 */
814 palkovsky 233
static zone_t * find_free_zone_lock(__u8 order, int *pzone)
367 jermar 234
{
814 palkovsky 235
    int i;
367 jermar 236
    zone_t *z;
814 palkovsky 237
    int hint = pzone ? *pzone : 0;
367 jermar 238
 
814 palkovsky 239
    spinlock_lock(&zones.lock);
240
    if (hint >= zones.count)
241
        hint = 0;
242
    i = hint;
243
    do {
244
        z = zones.info[i];
724 palkovsky 245
 
814 palkovsky 246
        spinlock_lock(&z->lock);
367 jermar 247
 
814 palkovsky 248
        /* Check if the zone has 2^order frames area available  */
822 palkovsky 249
        if (zone_can_alloc(z, order)) {
814 palkovsky 250
            spinlock_unlock(&zones.lock);
251
            if (pzone)
252
                *pzone = i;
253
            return z;
367 jermar 254
        }
814 palkovsky 255
        spinlock_unlock(&z->lock);
256
        if (++i >= zones.count)
257
            i = 0;
258
    } while(i != hint);
259
    spinlock_unlock(&zones.lock);
260
    return NULL;
367 jermar 261
}
262
 
814 palkovsky 263
/********************************************/
264
/* Buddy system functions */
265
 
266
/** Buddy system find_block implementation
367 jermar 267
 *
814 palkovsky 268
 * Find block that is parent of current list.
269
 * That means go to lower addresses, until such block is found
367 jermar 270
 *
814 palkovsky 271
 * @param order - Order of parent must be different then this parameter!!
367 jermar 272
 */
814 palkovsky 273
static link_t *zone_buddy_find_block(buddy_system_t *b, link_t *child,
274
                     __u8 order)
367 jermar 275
{
814 palkovsky 276
    frame_t * frame;
277
    zone_t * zone;
278
    index_t index;
367 jermar 279
 
814 palkovsky 280
    frame = list_get_instance(child, frame_t, buddy_link);
281
    zone = (zone_t *) b->data;
367 jermar 282
 
814 palkovsky 283
    index = frame_index(zone, frame);
284
    do {
285
        if (zone->frames[index].buddy_order != order) {
286
            return &zone->frames[index].buddy_link;
287
        }
288
    } while(index-- > 0);
289
    return NULL;
367 jermar 290
}
479 bondari 291
 
822 palkovsky 292
static void zone_buddy_print_id(buddy_system_t *b, link_t *block)
293
{
294
    frame_t * frame;
295
    zone_t * zone;
296
    index_t index;
479 bondari 297
 
822 palkovsky 298
    frame = list_get_instance(block, frame_t, buddy_link);
299
    zone = (zone_t *) b->data;
300
    index = frame_index(zone, frame);
1196 cejka 301
    printf("%zd", index);
822 palkovsky 302
}                    
303
 
479 bondari 304
/** Buddy system find_buddy implementation
489 jermar 305
 *
306
 * @param b Buddy system.
480 bondari 307
 * @param block Block for which buddy should be found
479 bondari 308
 *
480 bondari 309
 * @return Buddy for given block if found
479 bondari 310
 */
814 palkovsky 311
static link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block)
312
{
539 jermar 313
    frame_t * frame;
480 bondari 314
    zone_t * zone;
564 jermar 315
    index_t index;
480 bondari 316
    bool is_left, is_right;
479 bondari 317
 
480 bondari 318
    frame = list_get_instance(block, frame_t, buddy_link);
533 bondari 319
    zone = (zone_t *) b->data;
814 palkovsky 320
    ASSERT(IS_BUDDY_ORDER_OK(frame_index_abs(zone, frame), frame->buddy_order));
480 bondari 321
 
724 palkovsky 322
    is_left = IS_BUDDY_LEFT_BLOCK_ABS(zone, frame);
323
    is_right = IS_BUDDY_RIGHT_BLOCK_ABS(zone, frame);
814 palkovsky 324
 
564 jermar 325
    ASSERT(is_left ^ is_right);
533 bondari 326
    if (is_left) {
814 palkovsky 327
        index = (frame_index(zone, frame)) + (1 << frame->buddy_order);
615 palkovsky 328
    } else { // if (is_right)
814 palkovsky 329
        index = (frame_index(zone, frame)) - (1 << frame->buddy_order);
533 bondari 330
    }
331
 
814 palkovsky 332
    if (frame_index_valid(zone, index)) {
333
        if (zone->frames[index].buddy_order == frame->buddy_order &&
334
            zone->frames[index].refcount == 0) {
533 bondari 335
            return &zone->frames[index].buddy_link;
480 bondari 336
        }
337
    }
814 palkovsky 338
 
539 jermar 339
    return NULL;   
479 bondari 340
}
341
 
342
/** Buddy system bisect implementation
343
 *
489 jermar 344
 * @param b Buddy system.
480 bondari 345
 * @param block Block to bisect
346
 *
347
 * @return right block
479 bondari 348
 */
814 palkovsky 349
static link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) {
480 bondari 350
    frame_t * frame_l, * frame_r;
564 jermar 351
 
480 bondari 352
    frame_l = list_get_instance(block, frame_t, buddy_link);
533 bondari 353
    frame_r = (frame_l + (1 << (frame_l->buddy_order - 1)));
564 jermar 354
 
480 bondari 355
    return &frame_r->buddy_link;
479 bondari 356
}
357
 
358
/** Buddy system coalesce implementation
359
 *
489 jermar 360
 * @param b Buddy system.
480 bondari 361
 * @param block_1 First block
362
 * @param block_2 First block's buddy
363
 *
364
 * @return Coalesced block (actually block that represents lower address)
479 bondari 365
 */
814 palkovsky 366
static link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1,
822 palkovsky 367
                    link_t * block_2)
368
{
814 palkovsky 369
    frame_t *frame1, *frame2;
564 jermar 370
 
480 bondari 371
    frame1 = list_get_instance(block_1, frame_t, buddy_link);
372
    frame2 = list_get_instance(block_2, frame_t, buddy_link);
564 jermar 373
 
533 bondari 374
    return frame1 < frame2 ? block_1 : block_2;
479 bondari 375
}
376
 
377
/** Buddy system set_order implementation
489 jermar 378
 *
379
 * @param b Buddy system.
480 bondari 380
 * @param block Buddy system block
381
 * @param order Order to set
479 bondari 382
 */
814 palkovsky 383
static void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) {
480 bondari 384
    frame_t * frame;
385
    frame = list_get_instance(block, frame_t, buddy_link);
386
    frame->buddy_order = order;
479 bondari 387
}
388
 
389
/** Buddy system get_order implementation
489 jermar 390
 *
391
 * @param b Buddy system.
480 bondari 392
 * @param block Buddy system block
479 bondari 393
 *
480 bondari 394
 * @return Order of block
479 bondari 395
 */
814 palkovsky 396
static __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) {
480 bondari 397
    frame_t * frame;
398
    frame = list_get_instance(block, frame_t, buddy_link);
399
    return frame->buddy_order;
479 bondari 400
}
533 bondari 401
 
402
/** Buddy system mark_busy implementation
403
 *
404
 * @param b Buddy system
405
 * @param block Buddy system block
406
 *
407
 */
814 palkovsky 408
static void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) {
533 bondari 409
    frame_t * frame;
822 palkovsky 410
 
533 bondari 411
    frame = list_get_instance(block, frame_t, buddy_link);
412
    frame->refcount = 1;
413
}
676 bondari 414
 
814 palkovsky 415
/** Buddy system mark_available implementation
416
 *
417
 * @param b Buddy system
418
 * @param block Buddy system block
419
 *
420
 */
421
static void zone_buddy_mark_available(buddy_system_t *b, link_t * block) {
422
    frame_t * frame;
423
    frame = list_get_instance(block, frame_t, buddy_link);
424
    frame->refcount = 0;
425
}
426
 
427
static struct buddy_system_operations  zone_buddy_system_operations = {
428
    .find_buddy = zone_buddy_find_buddy,
429
    .bisect = zone_buddy_bisect,
430
    .coalesce = zone_buddy_coalesce,
431
    .set_order = zone_buddy_set_order,
432
    .get_order = zone_buddy_get_order,
433
    .mark_busy = zone_buddy_mark_busy,
434
    .mark_available = zone_buddy_mark_available,
822 palkovsky 435
    .find_block = zone_buddy_find_block,
436
    .print_id = zone_buddy_print_id
814 palkovsky 437
};
438
 
439
/*************************************/
440
/* Zone functions */
441
 
442
/** Allocate frame in particular zone
443
 *
444
 * Assume zone is locked
1269 decky 445
 * Panics if allocation is impossible.
814 palkovsky 446
 *
1269 decky 447
 * @param zone  Zone to allocate from.
448
 * @param order Allocate exactly 2^order frames.
449
 *
814 palkovsky 450
 * @return Frame index in zone
1269 decky 451
 *
814 palkovsky 452
 */
1269 decky 453
static pfn_t zone_frame_alloc(zone_t *zone, __u8 order)
814 palkovsky 454
{
455
    pfn_t v;
456
    link_t *tmp;
457
    frame_t *frame;
458
 
459
    /* Allocate frames from zone buddy system */
460
    tmp = buddy_system_alloc(zone->buddy_system, order);
461
 
462
    ASSERT(tmp);
463
 
464
    /* Update zone information. */
465
    zone->free_count -= (1 << order);
466
    zone->busy_count += (1 << order);
467
 
468
    /* Frame will be actually a first frame of the block. */
469
    frame = list_get_instance(tmp, frame_t, buddy_link);
470
 
471
    /* get frame address */
472
    v = make_frame_index(zone, frame);
473
    return v;
474
}
475
 
476
/** Free frame from zone
477
 *
478
 * Assume zone is locked
1568 palkovsky 479
 *
480
 * @param zone Pointer to zone from which the frame is to be freed
481
 * @param frame_idx Frame index relative to zone
814 palkovsky 482
 */
820 jermar 483
static void zone_frame_free(zone_t *zone, index_t frame_idx)
814 palkovsky 484
{
485
    frame_t *frame;
486
    __u8 order;
487
 
488
    frame = &zone->frames[frame_idx];
489
 
490
    /* remember frame order */
491
    order = frame->buddy_order;
492
 
493
    ASSERT(frame->refcount);
494
 
495
    if (!--frame->refcount) {
496
        buddy_system_free(zone->buddy_system, &frame->buddy_link);
946 jermar 497
 
498
        /* Update zone information. */
499
        zone->free_count += (1 << order);
500
        zone->busy_count -= (1 << order);
814 palkovsky 501
    }
502
}
503
 
504
/** Return frame from zone */
820 jermar 505
static frame_t * zone_get_frame(zone_t *zone, index_t frame_idx)
814 palkovsky 506
{
507
    ASSERT(frame_idx < zone->count);
508
    return &zone->frames[frame_idx];
509
}
510
 
511
/** Mark frame in zone unavailable to allocation */
820 jermar 512
static void zone_mark_unavailable(zone_t *zone, index_t frame_idx)
814 palkovsky 513
{
514
    frame_t *frame;
515
    link_t *link;
516
 
517
    frame = zone_get_frame(zone, frame_idx);
822 palkovsky 518
    if (frame->refcount)
519
        return;
814 palkovsky 520
    link = buddy_system_alloc_block(zone->buddy_system,
521
                    &frame->buddy_link);
522
    ASSERT(link);
523
    zone->free_count--;
524
}
525
 
822 palkovsky 526
/**
527
 * Join 2 zones
528
 *
529
 * Expect zone_t *z to point to space at least zone_conf_size large
530
 *
531
 * Assume z1 & z2 are locked
1568 palkovsky 532
 *
533
 * @param z Target zone structure pointer
534
 * @param z1 Zone to merge
535
 * @param z2 Zone to merge
822 palkovsky 536
 */
537
 
538
static void _zone_merge(zone_t *z, zone_t *z1, zone_t *z2)
539
{
540
    __u8 max_order;
541
    int i, z2idx;
542
    pfn_t frame_idx;
543
    frame_t *frame;
544
 
545
    ASSERT(!overlaps(z1->base,z1->count,z2->base,z2->count));
546
    ASSERT(z1->base < z2->base);
547
 
548
    spinlock_initialize(&z->lock, "zone_lock");
549
    z->base = z1->base;
550
    z->count = z2->base+z2->count - z1->base;
551
    z->flags = z1->flags & z2->flags;
552
 
553
    z->free_count = z1->free_count + z2->free_count;
554
    z->busy_count = z1->busy_count + z2->busy_count;
555
 
556
    max_order = fnzb(z->count);
557
 
558
    z->buddy_system = (buddy_system_t *)&z[1];
559
    buddy_system_create(z->buddy_system, max_order,
560
                &zone_buddy_system_operations,
561
                (void *) z);
562
 
563
    z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order));
564
    for (i = 0; i < z->count; i++) {
565
        /* This marks all frames busy */
566
        frame_initialize(&z->frames[i]);
567
    }
568
    /* Copy frames from both zones to preserve full frame orders,
1093 palkovsky 569
     * parents etc. Set all free frames with refcount=0 to 1, because
822 palkovsky 570
     * we add all free frames to buddy allocator later again, clear
1093 palkovsky 571
     * order to 0. Don't set busy frames with refcount=0, as they
572
     * will not be reallocated during merge and it would make later
573
     * problems with allocation/free.
822 palkovsky 574
     */
575
    for (i=0; i<z1->count; i++)
576
        z->frames[i] = z1->frames[i];
577
    for (i=0; i < z2->count; i++) {
578
        z2idx = i + (z2->base - z1->base);
579
        z->frames[z2idx] = z2->frames[i];
580
    }
1093 palkovsky 581
    i = 0;
582
    while (i < z->count) {
583
        if (z->frames[i].refcount) {
584
            /* skip busy frames */
585
            i += 1 << z->frames[i].buddy_order;
586
        } else { /* Free frames, set refcount=1 */
587
            /* All free frames have refcount=0, we need not
588
             * to check the order */
822 palkovsky 589
            z->frames[i].refcount = 1;
590
            z->frames[i].buddy_order = 0;
1093 palkovsky 591
            i++;
822 palkovsky 592
        }
593
    }
594
    /* Add free blocks from the 2 original zones */
595
    while (zone_can_alloc(z1, 0)) {
596
        frame_idx = zone_frame_alloc(z1, 0);
597
        frame = &z->frames[frame_idx];
598
        frame->refcount = 0;
599
        buddy_system_free(z->buddy_system, &frame->buddy_link);
600
    }
601
    while (zone_can_alloc(z2, 0)) {
602
        frame_idx = zone_frame_alloc(z2, 0);
603
        frame = &z->frames[frame_idx + (z2->base-z1->base)];
604
        frame->refcount = 0;
605
        buddy_system_free(z->buddy_system, &frame->buddy_link);
606
    }
607
}
608
 
609
/** Return old configuration frames into the zone
610
 *
611
 * We have several cases
612
 * - the conf. data is outside of zone -> exit, shall we call frame_free??
824 palkovsky 613
 * - the conf. data was created by zone_create or
614
 *   updated with reduce_region -> free every frame
615
 *
616
 * @param newzone The actual zone where freeing should occur
617
 * @param oldzone Pointer to old zone configuration data that should
618
 *                be freed from new zone
822 palkovsky 619
 */
620
static void return_config_frames(zone_t *newzone, zone_t *oldzone)
621
{
622
    pfn_t pfn;
623
    frame_t *frame;
624
    count_t cframes;
625
    int i;
626
 
627
    pfn = ADDR2PFN((__address)KA2PA(oldzone));
628
    cframes = SIZE2FRAMES(zone_conf_size(oldzone->count));
629
 
630
    if (pfn < newzone->base || pfn >= newzone->base + newzone->count)
631
        return;
632
 
633
    frame = &newzone->frames[pfn - newzone->base];
824 palkovsky 634
    ASSERT(!frame->buddy_order);
822 palkovsky 635
 
636
    for (i=0; i < cframes; i++) {
637
        newzone->busy_count++;
638
        zone_frame_free(newzone, pfn+i-newzone->base);
639
    }
640
}
641
 
824 palkovsky 642
/** Reduce allocated block to count of order 0 frames
643
 *
644
 * The allocated block need 2^order frames of space. Reduce all frames
1568 palkovsky 645
 * in block to order 0 and free the unneeded frames. This means, that
646
 * when freeing the previously allocated block starting with frame_idx,
647
 * you have to free every frame.
824 palkovsky 648
 *
649
 * @param zone
650
 * @param frame_idx Index to block
651
 * @param count Allocated space in block
652
 */
653
static void zone_reduce_region(zone_t *zone, pfn_t frame_idx, count_t count)
654
{
655
    count_t i;
656
    __u8 order;
657
    frame_t *frame;
658
 
659
    ASSERT(frame_idx+count < zone->count);
660
 
661
    order = zone->frames[frame_idx].buddy_order;
662
    ASSERT((1 << order) >= count);
663
 
664
    /* Reduce all blocks to order 0 */
665
    for (i=0; i < (1 << order); i++) {
666
        frame = &zone->frames[i + frame_idx];
667
        frame->buddy_order = 0;
668
        if (! frame->refcount)
669
            frame->refcount = 1;
670
        ASSERT(frame->refcount == 1);
671
    }
672
    /* Free unneeded frames */
673
    for (i=count; i < (1 << order); i++) {
674
        zone_frame_free(zone, i + frame_idx);
675
    }
676
}
677
 
822 palkovsky 678
/** Merge zones z1 and z2
679
 *
680
 * - the zones must be 2 zones with no zone existing in between,
681
 *   which means that z2 = z1+1
682
 *
683
 * - When you create a new zone, the frame allocator configuration does
684
 *   not to be 2^order size. Once the allocator is running it is no longer
685
 *   possible, merged configuration data occupies more space :-/
686
 */
687
void zone_merge(int z1, int z2)
688
{
689
    ipl_t ipl;
690
    zone_t *zone1, *zone2, *newzone;
691
    int cframes;
692
    __u8 order;
693
    int i;
694
    pfn_t pfn;
695
 
696
    ipl = interrupts_disable();
697
    spinlock_lock(&zones.lock);
698
 
699
    if (z1 < 0 || z1 >= zones.count || z2 < 0 || z2 >= zones.count)
700
        goto errout;
701
    /* We can join only 2 zones with none existing inbetween */
702
    if (z2-z1 != 1)
703
        goto errout;
704
 
705
    zone1 = zones.info[z1];
706
    zone2 = zones.info[z2];
707
    spinlock_lock(&zone1->lock);
708
    spinlock_lock(&zone2->lock);
709
 
710
    cframes = SIZE2FRAMES(zone_conf_size(zone2->base+zone2->count-zone1->base));
1700 palkovsky 711
    if (cframes == 1)
712
        order = 0;
713
    else
714
        order = fnzb(cframes - 1) + 1;
822 palkovsky 715
 
716
    /* Allocate zonedata inside one of the zones */
717
    if (zone_can_alloc(zone1, order))
718
        pfn = zone1->base + zone_frame_alloc(zone1, order);
719
    else if (zone_can_alloc(zone2, order))
720
        pfn = zone2->base + zone_frame_alloc(zone2, order);
721
    else
722
        goto errout2;
723
 
724
    newzone = (zone_t *)PA2KA(PFN2ADDR(pfn));
725
 
726
    _zone_merge(newzone, zone1, zone2);
727
 
824 palkovsky 728
    /* Free unneeded config frames */
729
    zone_reduce_region(newzone, pfn - newzone->base,  cframes);
822 palkovsky 730
    /* Subtract zone information from busy frames */
824 palkovsky 731
    newzone->busy_count -= cframes;
822 palkovsky 732
 
824 palkovsky 733
    /* Replace existing zones in zoneinfo list */
822 palkovsky 734
    zones.info[z1] = newzone;
1037 decky 735
    for (i = z2 + 1; i < zones.count; i++)
736
        zones.info[i - 1] = zones.info[i];
822 palkovsky 737
    zones.count--;
738
 
739
    /* Free old zone information */
740
    return_config_frames(newzone, zone1);
741
    return_config_frames(newzone, zone2);
742
errout2:
743
    /* Nobody is allowed to enter to zone, so we are safe
744
     * to touch the spinlocks last time */
745
    spinlock_unlock(&zone1->lock);
746
    spinlock_unlock(&zone2->lock);
747
errout:
748
    spinlock_unlock(&zones.lock);
749
    interrupts_restore(ipl);
750
}
751
 
752
/**
753
 * Merge all zones into one big zone
754
 *
755
 * It is reasonable to do this on systems whose bios reports parts in chunks,
756
 * so that we could have 1 zone (it's faster).
757
 */
758
void zone_merge_all(void)
759
{
760
    int count = zones.count;
761
 
762
    while (zones.count > 1 && --count) {
763
        zone_merge(0,1);
764
        break;
765
    }
766
}
767
 
814 palkovsky 768
/** Create frame zone
769
 *
770
 * Create new frame zone.
771
 *
772
 * @param start Physical address of the first frame within the zone.
1568 palkovsky 773
 * @param count Count of frames in zone
774
 * @param z Address of configuration information of zone
814 palkovsky 775
 * @param flags Zone flags.
776
 *
777
 * @return Initialized zone.
778
 */
822 palkovsky 779
static void zone_construct(pfn_t start, count_t count, zone_t *z, int flags)
814 palkovsky 780
{
781
    int i;
782
    __u8 max_order;
783
 
784
    spinlock_initialize(&z->lock, "zone_lock");
785
    z->base = start;
786
    z->count = count;
787
    z->flags = flags;
788
    z->free_count = count;
789
    z->busy_count = 0;
790
 
791
    /*
792
     * Compute order for buddy system, initialize
793
     */
822 palkovsky 794
    max_order = fnzb(count);
814 palkovsky 795
    z->buddy_system = (buddy_system_t *)&z[1];
796
 
797
    buddy_system_create(z->buddy_system, max_order,
798
                &zone_buddy_system_operations,
799
                (void *) z);
800
 
801
    /* Allocate frames _after_ the conframe */
802
    /* Check sizes */
803
    z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order));
804
    for (i = 0; i<count; i++) {
805
        frame_initialize(&z->frames[i]);
806
    }
852 palkovsky 807
 
814 palkovsky 808
    /* Stuffing frames */
809
    for (i = 0; i < count; i++) {
810
        z->frames[i].refcount = 0;
811
        buddy_system_free(z->buddy_system, &z->frames[i].buddy_link);
812
    }
813
}
814
 
1568 palkovsky 815
/** Compute configuration data size for zone
816
 *
817
 * @param count Size of zone in frames
818
 * @return Size of zone configuration info (in bytes)
819
 */
822 palkovsky 820
__address zone_conf_size(count_t count)
814 palkovsky 821
{
822
    int size = sizeof(zone_t) + count*sizeof(frame_t);
823
    int max_order;
824
 
822 palkovsky 825
    max_order = fnzb(count);
814 palkovsky 826
    size += buddy_conf_size(max_order);
827
    return size;
828
}
829
 
830
/** Create and add zone to system
831
 *
1568 palkovsky 832
 * @param start First frame number (absolute)
833
 * @param count Size of zone in frames
834
 * @param confframe Where configuration frames are supposed to be.
835
 *                  Automatically checks, that we will not disturb the
836
 *                  kernel and possibly init.
814 palkovsky 837
 *                  If confframe is given _outside_ this zone, it is expected,
838
 *                  that the area is already marked BUSY and big enough
1568 palkovsky 839
 *                  to contain zone_conf_size() amount of data.
840
 *                  If the confframe is inside the area, the zone free frame
841
 *                  information is modified not to include it.
822 palkovsky 842
 *
843
 * @return Zone number or -1 on error
814 palkovsky 844
 */
822 palkovsky 845
int zone_create(pfn_t start, count_t count, pfn_t confframe, int flags)
814 palkovsky 846
{
847
    zone_t *z;
822 palkovsky 848
    __address addr;
820 jermar 849
    count_t confcount;
814 palkovsky 850
    int i;
822 palkovsky 851
    int znum;
814 palkovsky 852
 
853
    /* Theoretically we could have here 0, practically make sure
854
     * nobody tries to do that. If some platform requires, remove
855
     * the assert
856
     */
857
    ASSERT(confframe);
858
    /* If conframe is supposed to be inside our zone, then make sure
859
     * it does not span kernel & init
860
     */
822 palkovsky 861
    confcount = SIZE2FRAMES(zone_conf_size(count));
814 palkovsky 862
    if (confframe >= start && confframe < start+count) {
1037 decky 863
        for (;confframe < start + count; confframe++) {
814 palkovsky 864
            addr = PFN2ADDR(confframe);
1037 decky 865
            if (overlaps(addr, PFN2ADDR(confcount), KA2PA(config.base), config.kernel_size))
814 palkovsky 866
                continue;
1037 decky 867
 
868
            bool overlap = false;
869
            count_t i;
870
            for (i = 0; i < init.cnt; i++)
871
                if (overlaps(addr, PFN2ADDR(confcount), KA2PA(init.tasks[i].addr), init.tasks[i].size)) {
872
                    overlap = true;
873
                    break;
874
                }
875
            if (overlap)
876
                continue;
877
 
814 palkovsky 878
            break;
879
        }
1037 decky 880
        if (confframe >= start + count)
814 palkovsky 881
            panic("Cannot find configuration data for zone.");
882
    }
883
 
822 palkovsky 884
    z = (zone_t *)PA2KA(PFN2ADDR(confframe));
885
    zone_construct(start, count, z, flags);
886
    znum = zones_add_zone(z);
887
    if (znum == -1)
888
        return -1;
889
 
814 palkovsky 890
    /* If confdata in zone, mark as unavailable */
891
    if (confframe >= start && confframe < start+count)
892
        for (i=confframe; i<confframe+confcount; i++) {
893
            zone_mark_unavailable(z, i - z->base);
894
        }
822 palkovsky 895
    return znum;
814 palkovsky 896
}
897
 
898
/***************************************/
899
/* Frame functions */
900
 
901
/** Set parent of frame */
902
void frame_set_parent(pfn_t pfn, void *data, int hint)
903
{
904
    zone_t *zone = find_zone_and_lock(pfn, &hint);
905
 
906
    ASSERT(zone);
907
 
908
    zone_get_frame(zone, pfn-zone->base)->parent = data;
909
    spinlock_unlock(&zone->lock);
910
}
911
 
912
void * frame_get_parent(pfn_t pfn, int hint)
913
{
914
    zone_t *zone = find_zone_and_lock(pfn, &hint);
915
    void *res;
916
 
917
    ASSERT(zone);
918
    res = zone_get_frame(zone, pfn - zone->base)->parent;
919
 
920
    spinlock_unlock(&zone->lock);
921
    return res;
922
}
923
 
924
/** Allocate power-of-two frames of physical memory.
925
 *
1269 decky 926
 * @param order  Allocate exactly 2^order frames.
927
 * @param flags  Flags for host zone selection and address processing.
928
 * @param status Allocation status (FRAME_OK on success), unused if NULL.
929
 * @param pzone  Preferred zone
814 palkovsky 930
 *
931
 * @return Allocated frame.
1269 decky 932
 *
814 palkovsky 933
 */
1269 decky 934
pfn_t frame_alloc_generic(__u8 order, int flags, int *status, int *pzone)
814 palkovsky 935
{
936
    ipl_t ipl;
937
    int freed;
938
    pfn_t v;
939
    zone_t *zone;
940
 
941
loop:
942
    ipl = interrupts_disable();
1269 decky 943
 
814 palkovsky 944
    /*
945
     * First, find suitable frame zone.
946
     */
1269 decky 947
    zone = find_free_zone_lock(order, pzone);
948
 
814 palkovsky 949
    /* If no memory, reclaim some slab memory,
950
       if it does not help, reclaim all */
951
    if (!zone && !(flags & FRAME_NO_RECLAIM)) {
952
        freed = slab_reclaim(0);
953
        if (freed)
1269 decky 954
            zone = find_free_zone_lock(order, pzone);
814 palkovsky 955
        if (!zone) {
956
            freed = slab_reclaim(SLAB_RECLAIM_ALL);
957
            if (freed)
1269 decky 958
                zone = find_free_zone_lock(order, pzone);
814 palkovsky 959
        }
960
    }
961
    if (!zone) {
962
        if (flags & FRAME_PANIC)
963
            panic("Can't allocate frame.\n");
964
 
965
        /*
966
         * TODO: Sleep until frames are available again.
967
         */
968
        interrupts_restore(ipl);
969
 
970
        if (flags & FRAME_ATOMIC) {
971
            ASSERT(status != NULL);
972
            if (status)
973
                *status = FRAME_NO_MEMORY;
974
            return NULL;
975
        }
976
 
977
        panic("Sleep not implemented.\n");
978
        goto loop;
979
    }
1269 decky 980
 
981
    v = zone_frame_alloc(zone, order);
814 palkovsky 982
    v += zone->base;
983
 
984
    spinlock_unlock(&zone->lock);
985
    interrupts_restore(ipl);
986
 
987
    if (status)
988
        *status = FRAME_OK;
989
    return v;
990
}
991
 
992
/** Free a frame.
993
 *
1236 jermar 994
 * Find respective frame structure for supplied PFN.
814 palkovsky 995
 * Decrement frame reference count.
996
 * If it drops to zero, move the frame structure to free list.
997
 *
1708 jermar 998
 * @param pfn Frame number of the frame to be freed.
814 palkovsky 999
 */
1000
void frame_free(pfn_t pfn)
1001
{
1002
    ipl_t ipl;
1003
    zone_t *zone;
1004
 
1005
    ipl = interrupts_disable();
1006
 
1007
    /*
1008
     * First, find host frame zone for addr.
1009
     */
1010
    zone = find_zone_and_lock(pfn,NULL);
1011
    ASSERT(zone);
1012
 
1013
    zone_frame_free(zone, pfn-zone->base);
1014
 
1015
    spinlock_unlock(&zone->lock);
1016
    interrupts_restore(ipl);
1017
}
1018
 
1236 jermar 1019
/** Add reference to frame.
1020
 *
1021
 * Find respective frame structure for supplied PFN and
1022
 * increment frame reference count.
1023
 *
1708 jermar 1024
 * @param pfn Frame number of the frame to be freed.
1236 jermar 1025
 */
1026
void frame_reference_add(pfn_t pfn)
1027
{
1028
    ipl_t ipl;
1029
    zone_t *zone;
1030
    frame_t *frame;
814 palkovsky 1031
 
1236 jermar 1032
    ipl = interrupts_disable();
1033
 
1034
    /*
1035
     * First, find host frame zone for addr.
1036
     */
1037
    zone = find_zone_and_lock(pfn,NULL);
1038
    ASSERT(zone);
1039
 
1040
    frame = &zone->frames[pfn-zone->base];
1041
    frame->refcount++;
1042
 
1043
    spinlock_unlock(&zone->lock);
1044
    interrupts_restore(ipl);
1045
}
814 palkovsky 1046
 
1047
/** Mark given range unavailable in frame zones */
820 jermar 1048
void frame_mark_unavailable(pfn_t start, count_t count)
814 palkovsky 1049
{
1050
    int i;
1051
    zone_t *zone;
1052
    int prefzone = 0;
852 palkovsky 1053
 
822 palkovsky 1054
    for (i=0; i < count; i++) {
814 palkovsky 1055
        zone = find_zone_and_lock(start+i,&prefzone);
1056
        if (!zone) /* PFN not found */
1057
            continue;
1058
        zone_mark_unavailable(zone, start+i-zone->base);
1059
 
1060
        spinlock_unlock(&zone->lock);
1061
    }
1062
}
1063
 
1064
/** Initialize physical memory management
1065
 *
1066
 * Initialize physical memory managemnt.
1067
 */
1068
void frame_init(void)
1069
{
1070
    if (config.cpu_active == 1) {
1071
        zones.count = 0;
1072
        spinlock_initialize(&zones.lock,"zones_glob_lock");
1073
    }
1074
    /* Tell the architecture to create some memory */
1075
    frame_arch_init();
1076
    if (config.cpu_active == 1) {
852 palkovsky 1077
        pfn_t firstframe = ADDR2PFN(KA2PA(config.base));
1078
        pfn_t lastframe = ADDR2PFN(KA2PA(config.base+config.kernel_size));
1079
        frame_mark_unavailable(firstframe,lastframe-firstframe+1);
1037 decky 1080
 
1081
        count_t i;
1082
        for (i = 0; i < init.cnt; i++)
1083
            frame_mark_unavailable(ADDR2PFN(KA2PA(init.tasks[i].addr)), SIZE2FRAMES(init.tasks[i].size));
1599 palkovsky 1084
 
1085
        /* Black list first frame, as allocating NULL would
1086
         * fail on some places */
1087
        frame_mark_unavailable(0, 1);
814 palkovsky 1088
    }
1089
}
1090
 
1091
 
1092
 
677 bondari 1093
/** Prints list of zones
1094
 *
1095
 */
676 bondari 1096
void zone_print_list(void) {
1097
    zone_t *zone = NULL;
814 palkovsky 1098
    int i;
701 jermar 1099
    ipl_t ipl;
1100
 
1101
    ipl = interrupts_disable();
814 palkovsky 1102
    spinlock_lock(&zones.lock);
822 palkovsky 1103
    printf("#  Base address\tFree Frames\tBusy Frames\n");
1104
    printf("   ------------\t-----------\t-----------\n");
1037 decky 1105
    for (i = 0; i < zones.count; i++) {
814 palkovsky 1106
        zone = zones.info[i];
683 bondari 1107
        spinlock_lock(&zone->lock);
1224 cejka 1108
        printf("%d: %.*p \t%10zd\t%10zd\n", i, sizeof(__address) * 2, PFN2ADDR(zone->base), zone->free_count, zone->busy_count);
701 jermar 1109
        spinlock_unlock(&zone->lock);
676 bondari 1110
    }
814 palkovsky 1111
    spinlock_unlock(&zones.lock);
701 jermar 1112
    interrupts_restore(ipl);
676 bondari 1113
}
1114
 
1708 jermar 1115
/** Prints zone details.
677 bondari 1116
 *
1708 jermar 1117
 * @param num Zone base address or zone number.
677 bondari 1118
 */
822 palkovsky 1119
void zone_print_one(int num) {
814 palkovsky 1120
    zone_t *zone = NULL;
701 jermar 1121
    ipl_t ipl;
822 palkovsky 1122
    int i;
701 jermar 1123
 
1124
    ipl = interrupts_disable();
814 palkovsky 1125
    spinlock_lock(&zones.lock);
822 palkovsky 1126
 
1037 decky 1127
    for (i = 0; i < zones.count; i++) {
824 palkovsky 1128
        if (i == num || PFN2ADDR(zones.info[i]->base) == num) {
822 palkovsky 1129
            zone = zones.info[i];
1130
            break;
1131
        }
676 bondari 1132
    }
822 palkovsky 1133
    if (!zone) {
1134
        printf("Zone not found.\n");
1135
        goto out;
1136
    }
676 bondari 1137
 
683 bondari 1138
    spinlock_lock(&zone->lock);
822 palkovsky 1139
    printf("Memory zone information\n");
1224 cejka 1140
    printf("Zone base address: %#.*p\n", sizeof(__address) * 2, PFN2ADDR(zone->base));
1196 cejka 1141
    printf("Zone size: %zd frames (%zdK)\n", zone->count, ((zone->count) * FRAME_SIZE) >> 10);
1142
    printf("Allocated space: %zd frames (%zdK)\n", zone->busy_count, (zone->busy_count * FRAME_SIZE) >> 10);
1143
    printf("Available space: %zd (%zdK)\n", zone->free_count, (zone->free_count * FRAME_SIZE) >> 10);
686 bondari 1144
    buddy_system_structure_print(zone->buddy_system, FRAME_SIZE);
683 bondari 1145
 
1146
    spinlock_unlock(&zone->lock);
822 palkovsky 1147
out:
814 palkovsky 1148
    spinlock_unlock(&zones.lock);
701 jermar 1149
    interrupts_restore(ipl);
676 bondari 1150
}
1151
 
1757 jermar 1152
/** @}
1702 cejka 1153
 */