Subversion Repositories HelenOS

Rev

Rev 824 | Rev 946 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

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