1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 /**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28
29 #define pr_fmt(fmt) "[TTM] " fmt
30
31 #include <drm/ttm/ttm_memory.h>
32 #include <drm/ttm/ttm_module.h>
33 #include <drm/ttm/ttm_page_alloc.h>
34 #include <linux/spinlock.h>
35 #include <linux/sched.h>
36 #include <linux/wait.h>
37 #include <linux/mm.h>
38 #include <linux/module.h>
39 #include <linux/slab.h>
40 #include <linux/swap.h>
41
42 #define TTM_MEMORY_ALLOC_RETRIES 4
43
44 struct ttm_mem_zone {
45 struct kobject kobj;
46 struct ttm_mem_global *glob;
47 const char *name;
48 uint64_t zone_mem;
49 uint64_t emer_mem;
50 uint64_t max_mem;
51 uint64_t swap_limit;
52 uint64_t used_mem;
53 };
54
55 static struct attribute ttm_mem_sys = {
56 .name = "zone_memory",
57 .mode = S_IRUGO
58 };
59 static struct attribute ttm_mem_emer = {
60 .name = "emergency_memory",
61 .mode = S_IRUGO | S_IWUSR
62 };
63 static struct attribute ttm_mem_max = {
64 .name = "available_memory",
65 .mode = S_IRUGO | S_IWUSR
66 };
67 static struct attribute ttm_mem_swap = {
68 .name = "swap_limit",
69 .mode = S_IRUGO | S_IWUSR
70 };
71 static struct attribute ttm_mem_used = {
72 .name = "used_memory",
73 .mode = S_IRUGO
74 };
75
ttm_mem_zone_kobj_release(struct kobject * kobj)76 static void ttm_mem_zone_kobj_release(struct kobject *kobj)
77 {
78 struct ttm_mem_zone *zone =
79 container_of(kobj, struct ttm_mem_zone, kobj);
80
81 pr_info("Zone %7s: Used memory at exit: %llu kiB\n",
82 zone->name, (unsigned long long)zone->used_mem >> 10);
83 kfree(zone);
84 }
85
ttm_mem_zone_show(struct kobject * kobj,struct attribute * attr,char * buffer)86 static ssize_t ttm_mem_zone_show(struct kobject *kobj,
87 struct attribute *attr,
88 char *buffer)
89 {
90 struct ttm_mem_zone *zone =
91 container_of(kobj, struct ttm_mem_zone, kobj);
92 uint64_t val = 0;
93
94 spin_lock(&zone->glob->lock);
95 if (attr == &ttm_mem_sys)
96 val = zone->zone_mem;
97 else if (attr == &ttm_mem_emer)
98 val = zone->emer_mem;
99 else if (attr == &ttm_mem_max)
100 val = zone->max_mem;
101 else if (attr == &ttm_mem_swap)
102 val = zone->swap_limit;
103 else if (attr == &ttm_mem_used)
104 val = zone->used_mem;
105 spin_unlock(&zone->glob->lock);
106
107 return snprintf(buffer, PAGE_SIZE, "%llu\n",
108 (unsigned long long) val >> 10);
109 }
110
111 static void ttm_check_swapping(struct ttm_mem_global *glob);
112
ttm_mem_zone_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t size)113 static ssize_t ttm_mem_zone_store(struct kobject *kobj,
114 struct attribute *attr,
115 const char *buffer,
116 size_t size)
117 {
118 struct ttm_mem_zone *zone =
119 container_of(kobj, struct ttm_mem_zone, kobj);
120 int chars;
121 unsigned long val;
122 uint64_t val64;
123
124 chars = sscanf(buffer, "%lu", &val);
125 if (chars == 0)
126 return size;
127
128 val64 = val;
129 val64 <<= 10;
130
131 spin_lock(&zone->glob->lock);
132 if (val64 > zone->zone_mem)
133 val64 = zone->zone_mem;
134 if (attr == &ttm_mem_emer) {
135 zone->emer_mem = val64;
136 if (zone->max_mem > val64)
137 zone->max_mem = val64;
138 } else if (attr == &ttm_mem_max) {
139 zone->max_mem = val64;
140 if (zone->emer_mem < val64)
141 zone->emer_mem = val64;
142 } else if (attr == &ttm_mem_swap)
143 zone->swap_limit = val64;
144 spin_unlock(&zone->glob->lock);
145
146 ttm_check_swapping(zone->glob);
147
148 return size;
149 }
150
151 static struct attribute *ttm_mem_zone_attrs[] = {
152 &ttm_mem_sys,
153 &ttm_mem_emer,
154 &ttm_mem_max,
155 &ttm_mem_swap,
156 &ttm_mem_used,
157 NULL
158 };
159
160 static const struct sysfs_ops ttm_mem_zone_ops = {
161 .show = &ttm_mem_zone_show,
162 .store = &ttm_mem_zone_store
163 };
164
165 static struct kobj_type ttm_mem_zone_kobj_type = {
166 .release = &ttm_mem_zone_kobj_release,
167 .sysfs_ops = &ttm_mem_zone_ops,
168 .default_attrs = ttm_mem_zone_attrs,
169 };
170
171 static struct attribute ttm_mem_global_lower_mem_limit = {
172 .name = "lower_mem_limit",
173 .mode = S_IRUGO | S_IWUSR
174 };
175
ttm_mem_global_show(struct kobject * kobj,struct attribute * attr,char * buffer)176 static ssize_t ttm_mem_global_show(struct kobject *kobj,
177 struct attribute *attr,
178 char *buffer)
179 {
180 struct ttm_mem_global *glob =
181 container_of(kobj, struct ttm_mem_global, kobj);
182 uint64_t val = 0;
183
184 spin_lock(&glob->lock);
185 val = glob->lower_mem_limit;
186 spin_unlock(&glob->lock);
187 /* convert from number of pages to KB */
188 val <<= (PAGE_SHIFT - 10);
189 return snprintf(buffer, PAGE_SIZE, "%llu\n",
190 (unsigned long long) val);
191 }
192
ttm_mem_global_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t size)193 static ssize_t ttm_mem_global_store(struct kobject *kobj,
194 struct attribute *attr,
195 const char *buffer,
196 size_t size)
197 {
198 int chars;
199 uint64_t val64;
200 unsigned long val;
201 struct ttm_mem_global *glob =
202 container_of(kobj, struct ttm_mem_global, kobj);
203
204 chars = sscanf(buffer, "%lu", &val);
205 if (chars == 0)
206 return size;
207
208 val64 = val;
209 /* convert from KB to number of pages */
210 val64 >>= (PAGE_SHIFT - 10);
211
212 spin_lock(&glob->lock);
213 glob->lower_mem_limit = val64;
214 spin_unlock(&glob->lock);
215
216 return size;
217 }
218
ttm_mem_global_kobj_release(struct kobject * kobj)219 static void ttm_mem_global_kobj_release(struct kobject *kobj)
220 {
221 struct ttm_mem_global *glob =
222 container_of(kobj, struct ttm_mem_global, kobj);
223
224 kfree(glob);
225 }
226
227 static struct attribute *ttm_mem_global_attrs[] = {
228 &ttm_mem_global_lower_mem_limit,
229 NULL
230 };
231
232 static const struct sysfs_ops ttm_mem_global_ops = {
233 .show = &ttm_mem_global_show,
234 .store = &ttm_mem_global_store,
235 };
236
237 static struct kobj_type ttm_mem_glob_kobj_type = {
238 .release = &ttm_mem_global_kobj_release,
239 .sysfs_ops = &ttm_mem_global_ops,
240 .default_attrs = ttm_mem_global_attrs,
241 };
242
ttm_zones_above_swap_target(struct ttm_mem_global * glob,bool from_wq,uint64_t extra)243 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
244 bool from_wq, uint64_t extra)
245 {
246 unsigned int i;
247 struct ttm_mem_zone *zone;
248 uint64_t target;
249
250 for (i = 0; i < glob->num_zones; ++i) {
251 zone = glob->zones[i];
252
253 if (from_wq)
254 target = zone->swap_limit;
255 else if (capable(CAP_SYS_ADMIN))
256 target = zone->emer_mem;
257 else
258 target = zone->max_mem;
259
260 target = (extra > target) ? 0ULL : target;
261
262 if (zone->used_mem > target)
263 return true;
264 }
265 return false;
266 }
267
268 /**
269 * At this point we only support a single shrink callback.
270 * Extend this if needed, perhaps using a linked list of callbacks.
271 * Note that this function is reentrant:
272 * many threads may try to swap out at any given time.
273 */
274
ttm_shrink(struct ttm_mem_global * glob,bool from_wq,uint64_t extra,struct ttm_operation_ctx * ctx)275 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
276 uint64_t extra, struct ttm_operation_ctx *ctx)
277 {
278 int ret;
279
280 spin_lock(&glob->lock);
281
282 while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
283 spin_unlock(&glob->lock);
284 ret = ttm_bo_swapout(glob->bo_glob, ctx);
285 spin_lock(&glob->lock);
286 if (unlikely(ret != 0))
287 break;
288 }
289
290 spin_unlock(&glob->lock);
291 }
292
ttm_shrink_work(struct work_struct * work)293 static void ttm_shrink_work(struct work_struct *work)
294 {
295 struct ttm_operation_ctx ctx = {
296 .interruptible = false,
297 .no_wait_gpu = false
298 };
299 struct ttm_mem_global *glob =
300 container_of(work, struct ttm_mem_global, work);
301
302 ttm_shrink(glob, true, 0ULL, &ctx);
303 }
304
ttm_mem_init_kernel_zone(struct ttm_mem_global * glob,const struct sysinfo * si)305 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
306 const struct sysinfo *si)
307 {
308 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
309 uint64_t mem;
310 int ret;
311
312 if (unlikely(!zone))
313 return -ENOMEM;
314
315 mem = si->totalram - si->totalhigh;
316 mem *= si->mem_unit;
317
318 zone->name = "kernel";
319 zone->zone_mem = mem;
320 zone->max_mem = mem >> 1;
321 zone->emer_mem = (mem >> 1) + (mem >> 2);
322 zone->swap_limit = zone->max_mem - (mem >> 3);
323 zone->used_mem = 0;
324 zone->glob = glob;
325 glob->zone_kernel = zone;
326 ret = kobject_init_and_add(
327 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
328 if (unlikely(ret != 0)) {
329 kobject_put(&zone->kobj);
330 return ret;
331 }
332 glob->zones[glob->num_zones++] = zone;
333 return 0;
334 }
335
336 #ifdef CONFIG_HIGHMEM
ttm_mem_init_highmem_zone(struct ttm_mem_global * glob,const struct sysinfo * si)337 static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
338 const struct sysinfo *si)
339 {
340 struct ttm_mem_zone *zone;
341 uint64_t mem;
342 int ret;
343
344 if (si->totalhigh == 0)
345 return 0;
346
347 zone = kzalloc(sizeof(*zone), GFP_KERNEL);
348 if (unlikely(!zone))
349 return -ENOMEM;
350
351 mem = si->totalram;
352 mem *= si->mem_unit;
353
354 zone->name = "highmem";
355 zone->zone_mem = mem;
356 zone->max_mem = mem >> 1;
357 zone->emer_mem = (mem >> 1) + (mem >> 2);
358 zone->swap_limit = zone->max_mem - (mem >> 3);
359 zone->used_mem = 0;
360 zone->glob = glob;
361 glob->zone_highmem = zone;
362 ret = kobject_init_and_add(
363 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s",
364 zone->name);
365 if (unlikely(ret != 0)) {
366 kobject_put(&zone->kobj);
367 return ret;
368 }
369 glob->zones[glob->num_zones++] = zone;
370 return 0;
371 }
372 #else
ttm_mem_init_dma32_zone(struct ttm_mem_global * glob,const struct sysinfo * si)373 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
374 const struct sysinfo *si)
375 {
376 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
377 uint64_t mem;
378 int ret;
379
380 if (unlikely(!zone))
381 return -ENOMEM;
382
383 mem = si->totalram;
384 mem *= si->mem_unit;
385
386 /**
387 * No special dma32 zone needed.
388 */
389
390 if (mem <= ((uint64_t) 1ULL << 32)) {
391 kfree(zone);
392 return 0;
393 }
394
395 /*
396 * Limit max dma32 memory to 4GB for now
397 * until we can figure out how big this
398 * zone really is.
399 */
400
401 mem = ((uint64_t) 1ULL << 32);
402 zone->name = "dma32";
403 zone->zone_mem = mem;
404 zone->max_mem = mem >> 1;
405 zone->emer_mem = (mem >> 1) + (mem >> 2);
406 zone->swap_limit = zone->max_mem - (mem >> 3);
407 zone->used_mem = 0;
408 zone->glob = glob;
409 glob->zone_dma32 = zone;
410 ret = kobject_init_and_add(
411 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
412 if (unlikely(ret != 0)) {
413 kobject_put(&zone->kobj);
414 return ret;
415 }
416 glob->zones[glob->num_zones++] = zone;
417 return 0;
418 }
419 #endif
420
ttm_mem_global_init(struct ttm_mem_global * glob)421 int ttm_mem_global_init(struct ttm_mem_global *glob)
422 {
423 struct sysinfo si;
424 int ret;
425 int i;
426 struct ttm_mem_zone *zone;
427
428 spin_lock_init(&glob->lock);
429 glob->swap_queue = create_singlethread_workqueue("ttm_swap");
430 INIT_WORK(&glob->work, ttm_shrink_work);
431 ret = kobject_init_and_add(
432 &glob->kobj, &ttm_mem_glob_kobj_type, ttm_get_kobj(), "memory_accounting");
433 if (unlikely(ret != 0)) {
434 kobject_put(&glob->kobj);
435 return ret;
436 }
437
438 si_meminfo(&si);
439
440 /* set it as 0 by default to keep original behavior of OOM */
441 glob->lower_mem_limit = 0;
442
443 ret = ttm_mem_init_kernel_zone(glob, &si);
444 if (unlikely(ret != 0))
445 goto out_no_zone;
446 #ifdef CONFIG_HIGHMEM
447 ret = ttm_mem_init_highmem_zone(glob, &si);
448 if (unlikely(ret != 0))
449 goto out_no_zone;
450 #else
451 ret = ttm_mem_init_dma32_zone(glob, &si);
452 if (unlikely(ret != 0))
453 goto out_no_zone;
454 #endif
455 for (i = 0; i < glob->num_zones; ++i) {
456 zone = glob->zones[i];
457 pr_info("Zone %7s: Available graphics memory: %llu kiB\n",
458 zone->name, (unsigned long long)zone->max_mem >> 10);
459 }
460 ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
461 ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
462 return 0;
463 out_no_zone:
464 ttm_mem_global_release(glob);
465 return ret;
466 }
467 EXPORT_SYMBOL(ttm_mem_global_init);
468
ttm_mem_global_release(struct ttm_mem_global * glob)469 void ttm_mem_global_release(struct ttm_mem_global *glob)
470 {
471 unsigned int i;
472 struct ttm_mem_zone *zone;
473
474 /* let the page allocator first stop the shrink work. */
475 ttm_page_alloc_fini();
476 ttm_dma_page_alloc_fini();
477
478 flush_workqueue(glob->swap_queue);
479 destroy_workqueue(glob->swap_queue);
480 glob->swap_queue = NULL;
481 for (i = 0; i < glob->num_zones; ++i) {
482 zone = glob->zones[i];
483 kobject_del(&zone->kobj);
484 kobject_put(&zone->kobj);
485 }
486 kobject_del(&glob->kobj);
487 kobject_put(&glob->kobj);
488 }
489 EXPORT_SYMBOL(ttm_mem_global_release);
490
ttm_check_swapping(struct ttm_mem_global * glob)491 static void ttm_check_swapping(struct ttm_mem_global *glob)
492 {
493 bool needs_swapping = false;
494 unsigned int i;
495 struct ttm_mem_zone *zone;
496
497 spin_lock(&glob->lock);
498 for (i = 0; i < glob->num_zones; ++i) {
499 zone = glob->zones[i];
500 if (zone->used_mem > zone->swap_limit) {
501 needs_swapping = true;
502 break;
503 }
504 }
505
506 spin_unlock(&glob->lock);
507
508 if (unlikely(needs_swapping))
509 (void)queue_work(glob->swap_queue, &glob->work);
510
511 }
512
ttm_mem_global_free_zone(struct ttm_mem_global * glob,struct ttm_mem_zone * single_zone,uint64_t amount)513 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
514 struct ttm_mem_zone *single_zone,
515 uint64_t amount)
516 {
517 unsigned int i;
518 struct ttm_mem_zone *zone;
519
520 spin_lock(&glob->lock);
521 for (i = 0; i < glob->num_zones; ++i) {
522 zone = glob->zones[i];
523 if (single_zone && zone != single_zone)
524 continue;
525 zone->used_mem -= amount;
526 }
527 spin_unlock(&glob->lock);
528 }
529
ttm_mem_global_free(struct ttm_mem_global * glob,uint64_t amount)530 void ttm_mem_global_free(struct ttm_mem_global *glob,
531 uint64_t amount)
532 {
533 return ttm_mem_global_free_zone(glob, NULL, amount);
534 }
535 EXPORT_SYMBOL(ttm_mem_global_free);
536
537 /*
538 * check if the available mem is under lower memory limit
539 *
540 * a. if no swap disk at all or free swap space is under swap_mem_limit
541 * but available system mem is bigger than sys_mem_limit, allow TTM
542 * allocation;
543 *
544 * b. if the available system mem is less than sys_mem_limit but free
545 * swap disk is bigger than swap_mem_limit, allow TTM allocation.
546 */
547 bool
ttm_check_under_lowerlimit(struct ttm_mem_global * glob,uint64_t num_pages,struct ttm_operation_ctx * ctx)548 ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
549 uint64_t num_pages,
550 struct ttm_operation_ctx *ctx)
551 {
552 int64_t available;
553
554 if (ctx->flags & TTM_OPT_FLAG_FORCE_ALLOC)
555 return false;
556
557 available = get_nr_swap_pages() + si_mem_available();
558 available -= num_pages;
559 if (available < glob->lower_mem_limit)
560 return true;
561
562 return false;
563 }
564 EXPORT_SYMBOL(ttm_check_under_lowerlimit);
565
ttm_mem_global_reserve(struct ttm_mem_global * glob,struct ttm_mem_zone * single_zone,uint64_t amount,bool reserve)566 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
567 struct ttm_mem_zone *single_zone,
568 uint64_t amount, bool reserve)
569 {
570 uint64_t limit;
571 int ret = -ENOMEM;
572 unsigned int i;
573 struct ttm_mem_zone *zone;
574
575 spin_lock(&glob->lock);
576 for (i = 0; i < glob->num_zones; ++i) {
577 zone = glob->zones[i];
578 if (single_zone && zone != single_zone)
579 continue;
580
581 limit = (capable(CAP_SYS_ADMIN)) ?
582 zone->emer_mem : zone->max_mem;
583
584 if (zone->used_mem > limit)
585 goto out_unlock;
586 }
587
588 if (reserve) {
589 for (i = 0; i < glob->num_zones; ++i) {
590 zone = glob->zones[i];
591 if (single_zone && zone != single_zone)
592 continue;
593 zone->used_mem += amount;
594 }
595 }
596
597 ret = 0;
598 out_unlock:
599 spin_unlock(&glob->lock);
600 ttm_check_swapping(glob);
601
602 return ret;
603 }
604
605
ttm_mem_global_alloc_zone(struct ttm_mem_global * glob,struct ttm_mem_zone * single_zone,uint64_t memory,struct ttm_operation_ctx * ctx)606 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
607 struct ttm_mem_zone *single_zone,
608 uint64_t memory,
609 struct ttm_operation_ctx *ctx)
610 {
611 int count = TTM_MEMORY_ALLOC_RETRIES;
612
613 while (unlikely(ttm_mem_global_reserve(glob,
614 single_zone,
615 memory, true)
616 != 0)) {
617 if (ctx->no_wait_gpu)
618 return -ENOMEM;
619 if (unlikely(count-- == 0))
620 return -ENOMEM;
621 ttm_shrink(glob, false, memory + (memory >> 2) + 16, ctx);
622 }
623
624 return 0;
625 }
626
ttm_mem_global_alloc(struct ttm_mem_global * glob,uint64_t memory,struct ttm_operation_ctx * ctx)627 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
628 struct ttm_operation_ctx *ctx)
629 {
630 /**
631 * Normal allocations of kernel memory are registered in
632 * all zones.
633 */
634
635 return ttm_mem_global_alloc_zone(glob, NULL, memory, ctx);
636 }
637 EXPORT_SYMBOL(ttm_mem_global_alloc);
638
ttm_mem_global_alloc_page(struct ttm_mem_global * glob,struct page * page,uint64_t size,struct ttm_operation_ctx * ctx)639 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
640 struct page *page, uint64_t size,
641 struct ttm_operation_ctx *ctx)
642 {
643 struct ttm_mem_zone *zone = NULL;
644
645 /**
646 * Page allocations may be registed in a single zone
647 * only if highmem or !dma32.
648 */
649
650 #ifdef CONFIG_HIGHMEM
651 if (PageHighMem(page) && glob->zone_highmem != NULL)
652 zone = glob->zone_highmem;
653 #else
654 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
655 zone = glob->zone_kernel;
656 #endif
657 return ttm_mem_global_alloc_zone(glob, zone, size, ctx);
658 }
659
ttm_mem_global_free_page(struct ttm_mem_global * glob,struct page * page,uint64_t size)660 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page,
661 uint64_t size)
662 {
663 struct ttm_mem_zone *zone = NULL;
664
665 #ifdef CONFIG_HIGHMEM
666 if (PageHighMem(page) && glob->zone_highmem != NULL)
667 zone = glob->zone_highmem;
668 #else
669 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
670 zone = glob->zone_kernel;
671 #endif
672 ttm_mem_global_free_zone(glob, zone, size);
673 }
674
ttm_round_pot(size_t size)675 size_t ttm_round_pot(size_t size)
676 {
677 if ((size & (size - 1)) == 0)
678 return size;
679 else if (size > PAGE_SIZE)
680 return PAGE_ALIGN(size);
681 else {
682 size_t tmp_size = 4;
683
684 while (tmp_size < size)
685 tmp_size <<= 1;
686
687 return tmp_size;
688 }
689 return 0;
690 }
691 EXPORT_SYMBOL(ttm_round_pot);
692
ttm_get_kernel_zone_memory_size(struct ttm_mem_global * glob)693 uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob)
694 {
695 return glob->zone_kernel->max_mem;
696 }
697 EXPORT_SYMBOL(ttm_get_kernel_zone_memory_size);
698
