1 /* $NetBSD: ttm_memory.c,v 1.9 2021/12/19 11:07:20 riastradh Exp $ */
2
3 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
4 /**************************************************************************
5 *
6 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
7 * All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the
11 * "Software"), to deal in the Software without restriction, including
12 * without limitation the rights to use, copy, modify, merge, publish,
13 * distribute, sub license, and/or sell copies of the Software, and to
14 * permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
16 *
17 * The above copyright notice and this permission notice (including the
18 * next paragraph) shall be included in all copies or substantial portions
19 * of the Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
24 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
25 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
26 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
27 * USE OR OTHER DEALINGS IN THE SOFTWARE.
28 *
29 **************************************************************************/
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: ttm_memory.c,v 1.9 2021/12/19 11:07:20 riastradh Exp $");
33
34 #define pr_fmt(fmt) "[TTM] " fmt
35
36 #include <drm/ttm/ttm_memory.h>
37 #include <drm/ttm/ttm_module.h>
38 #include <drm/ttm/ttm_page_alloc.h>
39 #include <linux/spinlock.h>
40 #include <linux/sched.h>
41 #include <linux/wait.h>
42 #include <linux/mm.h>
43 #include <linux/module.h>
44 #include <linux/slab.h>
45 #include <linux/swap.h>
46
47 #define TTM_MEMORY_ALLOC_RETRIES 4
48
49 struct ttm_mem_global ttm_mem_glob;
50 EXPORT_SYMBOL(ttm_mem_glob);
51
52 struct ttm_mem_zone {
53 #ifndef __NetBSD__
54 struct kobject kobj;
55 #endif
56 struct ttm_mem_global *glob;
57 const char *name;
58 uint64_t zone_mem;
59 uint64_t emer_mem;
60 uint64_t max_mem;
61 uint64_t swap_limit;
62 uint64_t used_mem;
63 };
64
65 #ifndef __NetBSD__
66 static struct attribute ttm_mem_sys = {
67 .name = "zone_memory",
68 .mode = S_IRUGO
69 };
70 static struct attribute ttm_mem_emer = {
71 .name = "emergency_memory",
72 .mode = S_IRUGO | S_IWUSR
73 };
74 static struct attribute ttm_mem_max = {
75 .name = "available_memory",
76 .mode = S_IRUGO | S_IWUSR
77 };
78 static struct attribute ttm_mem_swap = {
79 .name = "swap_limit",
80 .mode = S_IRUGO | S_IWUSR
81 };
82 static struct attribute ttm_mem_used = {
83 .name = "used_memory",
84 .mode = S_IRUGO
85 };
86
ttm_mem_zone_kobj_release(struct kobject * kobj)87 static void ttm_mem_zone_kobj_release(struct kobject *kobj)
88 {
89 struct ttm_mem_zone *zone =
90 container_of(kobj, struct ttm_mem_zone, kobj);
91
92 pr_info("Zone %7s: Used memory at exit: %llu KiB\n",
93 zone->name, (unsigned long long)zone->used_mem >> 10);
94 kfree(zone);
95 }
96
ttm_mem_zone_show(struct kobject * kobj,struct attribute * attr,char * buffer)97 static ssize_t ttm_mem_zone_show(struct kobject *kobj,
98 struct attribute *attr,
99 char *buffer)
100 {
101 struct ttm_mem_zone *zone =
102 container_of(kobj, struct ttm_mem_zone, kobj);
103 uint64_t val = 0;
104
105 spin_lock(&zone->glob->lock);
106 if (attr == &ttm_mem_sys)
107 val = zone->zone_mem;
108 else if (attr == &ttm_mem_emer)
109 val = zone->emer_mem;
110 else if (attr == &ttm_mem_max)
111 val = zone->max_mem;
112 else if (attr == &ttm_mem_swap)
113 val = zone->swap_limit;
114 else if (attr == &ttm_mem_used)
115 val = zone->used_mem;
116 spin_unlock(&zone->glob->lock);
117
118 return snprintf(buffer, PAGE_SIZE, "%llu\n",
119 (unsigned long long) val >> 10);
120 }
121
122 static void ttm_check_swapping(struct ttm_mem_global *glob);
123
ttm_mem_zone_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t size)124 static ssize_t ttm_mem_zone_store(struct kobject *kobj,
125 struct attribute *attr,
126 const char *buffer,
127 size_t size)
128 {
129 struct ttm_mem_zone *zone =
130 container_of(kobj, struct ttm_mem_zone, kobj);
131 int chars;
132 unsigned long val;
133 uint64_t val64;
134
135 chars = sscanf(buffer, "%lu", &val);
136 if (chars == 0)
137 return size;
138
139 val64 = val;
140 val64 <<= 10;
141
142 spin_lock(&zone->glob->lock);
143 if (val64 > zone->zone_mem)
144 val64 = zone->zone_mem;
145 if (attr == &ttm_mem_emer) {
146 zone->emer_mem = val64;
147 if (zone->max_mem > val64)
148 zone->max_mem = val64;
149 } else if (attr == &ttm_mem_max) {
150 zone->max_mem = val64;
151 if (zone->emer_mem < val64)
152 zone->emer_mem = val64;
153 } else if (attr == &ttm_mem_swap)
154 zone->swap_limit = val64;
155 spin_unlock(&zone->glob->lock);
156
157 ttm_check_swapping(zone->glob);
158
159 return size;
160 }
161
162 static struct attribute *ttm_mem_zone_attrs[] = {
163 &ttm_mem_sys,
164 &ttm_mem_emer,
165 &ttm_mem_max,
166 &ttm_mem_swap,
167 &ttm_mem_used,
168 NULL
169 };
170
171 static const struct sysfs_ops ttm_mem_zone_ops = {
172 .show = &ttm_mem_zone_show,
173 .store = &ttm_mem_zone_store
174 };
175
176 static struct kobj_type ttm_mem_zone_kobj_type = {
177 .release = &ttm_mem_zone_kobj_release,
178 .sysfs_ops = &ttm_mem_zone_ops,
179 .default_attrs = ttm_mem_zone_attrs,
180 };
181
182 static struct attribute ttm_mem_global_lower_mem_limit = {
183 .name = "lower_mem_limit",
184 .mode = S_IRUGO | S_IWUSR
185 };
186
ttm_mem_global_show(struct kobject * kobj,struct attribute * attr,char * buffer)187 static ssize_t ttm_mem_global_show(struct kobject *kobj,
188 struct attribute *attr,
189 char *buffer)
190 {
191 struct ttm_mem_global *glob =
192 container_of(kobj, struct ttm_mem_global, kobj);
193 uint64_t val = 0;
194
195 spin_lock(&glob->lock);
196 val = glob->lower_mem_limit;
197 spin_unlock(&glob->lock);
198 /* convert from number of pages to KB */
199 val <<= (PAGE_SHIFT - 10);
200 return snprintf(buffer, PAGE_SIZE, "%llu\n",
201 (unsigned long long) val);
202 }
203
ttm_mem_global_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t size)204 static ssize_t ttm_mem_global_store(struct kobject *kobj,
205 struct attribute *attr,
206 const char *buffer,
207 size_t size)
208 {
209 int chars;
210 uint64_t val64;
211 unsigned long val;
212 struct ttm_mem_global *glob =
213 container_of(kobj, struct ttm_mem_global, kobj);
214
215 chars = sscanf(buffer, "%lu", &val);
216 if (chars == 0)
217 return size;
218
219 val64 = val;
220 /* convert from KB to number of pages */
221 val64 >>= (PAGE_SHIFT - 10);
222
223 spin_lock(&glob->lock);
224 glob->lower_mem_limit = val64;
225 spin_unlock(&glob->lock);
226
227 return size;
228 }
229
230 static struct attribute *ttm_mem_global_attrs[] = {
231 &ttm_mem_global_lower_mem_limit,
232 NULL
233 };
234
235 static const struct sysfs_ops ttm_mem_global_ops = {
236 .show = &ttm_mem_global_show,
237 .store = &ttm_mem_global_store,
238 };
239
240 static struct kobj_type ttm_mem_glob_kobj_type = {
241 .sysfs_ops = &ttm_mem_global_ops,
242 .default_attrs = ttm_mem_global_attrs,
243 };
244 #endif
245
ttm_zones_above_swap_target(struct ttm_mem_global * glob,bool from_wq,uint64_t extra)246 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
247 bool from_wq, uint64_t extra)
248 {
249 unsigned int i;
250 struct ttm_mem_zone *zone;
251 uint64_t target;
252
253 for (i = 0; i < glob->num_zones; ++i) {
254 zone = glob->zones[i];
255
256 if (from_wq)
257 target = zone->swap_limit;
258 else if (capable(CAP_SYS_ADMIN))
259 target = zone->emer_mem;
260 else
261 target = zone->max_mem;
262
263 target = (extra > target) ? 0ULL : target;
264
265 if (zone->used_mem > target)
266 return true;
267 }
268 return false;
269 }
270
271 /**
272 * At this point we only support a single shrink callback.
273 * Extend this if needed, perhaps using a linked list of callbacks.
274 * Note that this function is reentrant:
275 * many threads may try to swap out at any given time.
276 */
277
ttm_shrink(struct ttm_mem_global * glob,bool from_wq,uint64_t extra,struct ttm_operation_ctx * ctx)278 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
279 uint64_t extra, struct ttm_operation_ctx *ctx)
280 {
281 int ret;
282
283 spin_lock(&glob->lock);
284
285 while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
286 spin_unlock(&glob->lock);
287 ret = ttm_bo_swapout(&ttm_bo_glob, ctx);
288 spin_lock(&glob->lock);
289 if (unlikely(ret != 0))
290 break;
291 }
292
293 spin_unlock(&glob->lock);
294 }
295
ttm_shrink_work(struct work_struct * work)296 static void ttm_shrink_work(struct work_struct *work)
297 {
298 struct ttm_operation_ctx ctx = {
299 .interruptible = false,
300 .no_wait_gpu = false
301 };
302 struct ttm_mem_global *glob =
303 container_of(work, struct ttm_mem_global, work);
304
305 ttm_shrink(glob, true, 0ULL, &ctx);
306 }
307
ttm_mem_init_kernel_zone(struct ttm_mem_global * glob,const struct sysinfo * si)308 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
309 const struct sysinfo *si)
310 {
311 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
312 uint64_t mem;
313 #ifndef __NetBSD__
314 int ret;
315 #endif
316
317 if (unlikely(!zone))
318 return -ENOMEM;
319
320 mem = si->totalram - si->totalhigh;
321 mem *= si->mem_unit;
322
323 zone->name = "kernel";
324 zone->zone_mem = mem;
325 zone->max_mem = mem >> 1;
326 zone->emer_mem = (mem >> 1) + (mem >> 2);
327 zone->swap_limit = zone->max_mem - (mem >> 3);
328 zone->used_mem = 0;
329 zone->glob = glob;
330 glob->zone_kernel = zone;
331 #ifndef __NetBSD__
332 ret = kobject_init_and_add(
333 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
334 if (unlikely(ret != 0)) {
335 kobject_put(&zone->kobj);
336 return ret;
337 }
338 #endif
339 glob->zones[glob->num_zones++] = zone;
340 return 0;
341 }
342
343 #ifdef CONFIG_HIGHMEM
ttm_mem_init_highmem_zone(struct ttm_mem_global * glob,const struct sysinfo * si)344 static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
345 const struct sysinfo *si)
346 {
347 struct ttm_mem_zone *zone;
348 uint64_t mem;
349 #ifndef __NetBSD__
350 int ret;
351 #endif
352
353 if (si->totalhigh == 0)
354 return 0;
355
356 zone = kzalloc(sizeof(*zone), GFP_KERNEL);
357 if (unlikely(!zone))
358 return -ENOMEM;
359
360 mem = si->totalram;
361 mem *= si->mem_unit;
362
363 zone->name = "highmem";
364 zone->zone_mem = mem;
365 zone->max_mem = mem >> 1;
366 zone->emer_mem = (mem >> 1) + (mem >> 2);
367 zone->swap_limit = zone->max_mem - (mem >> 3);
368 zone->used_mem = 0;
369 zone->glob = glob;
370 glob->zone_highmem = zone;
371 #ifndef __NetBSD__
372 ret = kobject_init_and_add(
373 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s",
374 zone->name);
375 if (unlikely(ret != 0)) {
376 kobject_put(&zone->kobj);
377 return ret;
378 }
379 #endif
380 glob->zones[glob->num_zones++] = zone;
381 return 0;
382 }
383 #else
ttm_mem_init_dma32_zone(struct ttm_mem_global * glob,const struct sysinfo * si)384 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
385 const struct sysinfo *si)
386 {
387 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
388 uint64_t mem;
389 #ifndef __NetBSD__
390 int ret;
391 #endif
392
393 if (unlikely(!zone))
394 return -ENOMEM;
395
396 mem = si->totalram;
397 mem *= si->mem_unit;
398
399 /**
400 * No special dma32 zone needed.
401 */
402
403 if (mem <= ((uint64_t) 1ULL << 32)) {
404 kfree(zone);
405 return 0;
406 }
407
408 /*
409 * Limit max dma32 memory to 4GB for now
410 * until we can figure out how big this
411 * zone really is.
412 */
413
414 mem = ((uint64_t) 1ULL << 32);
415 zone->name = "dma32";
416 zone->zone_mem = mem;
417 zone->max_mem = mem >> 1;
418 zone->emer_mem = (mem >> 1) + (mem >> 2);
419 zone->swap_limit = zone->max_mem - (mem >> 3);
420 zone->used_mem = 0;
421 zone->glob = glob;
422 glob->zone_dma32 = zone;
423 #ifndef __NetBSD__
424 ret = kobject_init_and_add(
425 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
426 if (unlikely(ret != 0)) {
427 kobject_put(&zone->kobj);
428 return ret;
429 }
430 #endif
431 glob->zones[glob->num_zones++] = zone;
432 return 0;
433 }
434 #endif
435
ttm_mem_global_init(struct ttm_mem_global * glob)436 int ttm_mem_global_init(struct ttm_mem_global *glob)
437 {
438 struct sysinfo si;
439 int ret;
440 int i;
441 struct ttm_mem_zone *zone;
442
443 spin_lock_init(&glob->lock);
444 glob->swap_queue = create_singlethread_workqueue("ttm_swap");
445 INIT_WORK(&glob->work, ttm_shrink_work);
446 #ifndef __NetBSD__
447 ret = kobject_init_and_add(
448 &glob->kobj, &ttm_mem_glob_kobj_type, ttm_get_kobj(), "memory_accounting");
449 if (unlikely(ret != 0)) {
450 kobject_put(&glob->kobj);
451 return ret;
452 }
453 #endif
454
455 si_meminfo(&si);
456
457 /* set it as 0 by default to keep original behavior of OOM */
458 glob->lower_mem_limit = 0;
459
460 ret = ttm_mem_init_kernel_zone(glob, &si);
461 if (unlikely(ret != 0))
462 goto out_no_zone;
463 #ifdef CONFIG_HIGHMEM
464 ret = ttm_mem_init_highmem_zone(glob, &si);
465 if (unlikely(ret != 0))
466 goto out_no_zone;
467 #else
468 ret = ttm_mem_init_dma32_zone(glob, &si);
469 if (unlikely(ret != 0))
470 goto out_no_zone;
471 #endif
472 for (i = 0; i < glob->num_zones; ++i) {
473 zone = glob->zones[i];
474 pr_info("Zone %7s: Available graphics memory: %llu KiB\n",
475 zone->name, (unsigned long long)zone->max_mem >> 10);
476 }
477 ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
478 ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
479 return 0;
480 out_no_zone:
481 ttm_mem_global_release(glob);
482 return ret;
483 }
484
ttm_mem_global_release(struct ttm_mem_global * glob)485 void ttm_mem_global_release(struct ttm_mem_global *glob)
486 {
487 struct ttm_mem_zone *zone;
488 unsigned int i;
489
490 /* let the page allocator first stop the shrink work. */
491 ttm_page_alloc_fini();
492 ttm_dma_page_alloc_fini();
493
494 flush_workqueue(glob->swap_queue);
495 destroy_workqueue(glob->swap_queue);
496 glob->swap_queue = NULL;
497 for (i = 0; i < glob->num_zones; ++i) {
498 zone = glob->zones[i];
499 #ifdef __NetBSD__
500 kfree(zone);
501 #else
502 kobject_del(&zone->kobj);
503 kobject_put(&zone->kobj);
504 #endif
505 }
506 #ifndef __NetBSD__
507 kobject_del(&glob->kobj);
508 kobject_put(&glob->kobj);
509 #endif
510 memset(glob, 0, sizeof(*glob));
511 }
512
ttm_check_swapping(struct ttm_mem_global * glob)513 static void ttm_check_swapping(struct ttm_mem_global *glob)
514 {
515 bool needs_swapping = false;
516 unsigned int i;
517 struct ttm_mem_zone *zone;
518
519 spin_lock(&glob->lock);
520 for (i = 0; i < glob->num_zones; ++i) {
521 zone = glob->zones[i];
522 if (zone->used_mem > zone->swap_limit) {
523 needs_swapping = true;
524 break;
525 }
526 }
527
528 spin_unlock(&glob->lock);
529
530 if (unlikely(needs_swapping))
531 (void)queue_work(glob->swap_queue, &glob->work);
532
533 }
534
ttm_mem_global_free_zone(struct ttm_mem_global * glob,struct ttm_mem_zone * single_zone,uint64_t amount)535 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
536 struct ttm_mem_zone *single_zone,
537 uint64_t amount)
538 {
539 unsigned int i;
540 struct ttm_mem_zone *zone;
541
542 spin_lock(&glob->lock);
543 for (i = 0; i < glob->num_zones; ++i) {
544 zone = glob->zones[i];
545 if (single_zone && zone != single_zone)
546 continue;
547 zone->used_mem -= amount;
548 }
549 spin_unlock(&glob->lock);
550 }
551
ttm_mem_global_free(struct ttm_mem_global * glob,uint64_t amount)552 void ttm_mem_global_free(struct ttm_mem_global *glob,
553 uint64_t amount)
554 {
555 return ttm_mem_global_free_zone(glob, glob->zone_kernel, amount);
556 }
557 EXPORT_SYMBOL(ttm_mem_global_free);
558
559 /*
560 * check if the available mem is under lower memory limit
561 *
562 * a. if no swap disk at all or free swap space is under swap_mem_limit
563 * but available system mem is bigger than sys_mem_limit, allow TTM
564 * allocation;
565 *
566 * b. if the available system mem is less than sys_mem_limit but free
567 * swap disk is bigger than swap_mem_limit, allow TTM allocation.
568 */
569 bool
ttm_check_under_lowerlimit(struct ttm_mem_global * glob,uint64_t num_pages,struct ttm_operation_ctx * ctx)570 ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
571 uint64_t num_pages,
572 struct ttm_operation_ctx *ctx)
573 {
574 int64_t available;
575
576 if (ctx->flags & TTM_OPT_FLAG_FORCE_ALLOC)
577 return false;
578
579 available = get_nr_swap_pages() + si_mem_available();
580 available -= num_pages;
581 if (available < glob->lower_mem_limit)
582 return true;
583
584 return false;
585 }
586 EXPORT_SYMBOL(ttm_check_under_lowerlimit);
587
ttm_mem_global_reserve(struct ttm_mem_global * glob,struct ttm_mem_zone * single_zone,uint64_t amount,bool reserve)588 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
589 struct ttm_mem_zone *single_zone,
590 uint64_t amount, bool reserve)
591 {
592 uint64_t limit;
593 int ret = -ENOMEM;
594 unsigned int i;
595 struct ttm_mem_zone *zone;
596
597 spin_lock(&glob->lock);
598 for (i = 0; i < glob->num_zones; ++i) {
599 zone = glob->zones[i];
600 if (single_zone && zone != single_zone)
601 continue;
602
603 limit = (capable(CAP_SYS_ADMIN)) ?
604 zone->emer_mem : zone->max_mem;
605
606 if (zone->used_mem > limit)
607 goto out_unlock;
608 }
609
610 if (reserve) {
611 for (i = 0; i < glob->num_zones; ++i) {
612 zone = glob->zones[i];
613 if (single_zone && zone != single_zone)
614 continue;
615 zone->used_mem += amount;
616 }
617 }
618
619 ret = 0;
620 out_unlock:
621 spin_unlock(&glob->lock);
622 ttm_check_swapping(glob);
623
624 return ret;
625 }
626
627
ttm_mem_global_alloc_zone(struct ttm_mem_global * glob,struct ttm_mem_zone * single_zone,uint64_t memory,struct ttm_operation_ctx * ctx)628 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
629 struct ttm_mem_zone *single_zone,
630 uint64_t memory,
631 struct ttm_operation_ctx *ctx)
632 {
633 int count = TTM_MEMORY_ALLOC_RETRIES;
634
635 while (unlikely(ttm_mem_global_reserve(glob,
636 single_zone,
637 memory, true)
638 != 0)) {
639 if (ctx->no_wait_gpu)
640 return -ENOMEM;
641 if (unlikely(count-- == 0))
642 return -ENOMEM;
643 ttm_shrink(glob, false, memory + (memory >> 2) + 16, ctx);
644 }
645
646 return 0;
647 }
648
ttm_mem_global_alloc(struct ttm_mem_global * glob,uint64_t memory,struct ttm_operation_ctx * ctx)649 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
650 struct ttm_operation_ctx *ctx)
651 {
652 /**
653 * Normal allocations of kernel memory are registered in
654 * the kernel zone.
655 */
656
657 return ttm_mem_global_alloc_zone(glob, glob->zone_kernel, memory, ctx);
658 }
659 EXPORT_SYMBOL(ttm_mem_global_alloc);
660
ttm_mem_global_alloc_page(struct ttm_mem_global * glob,struct page * page,uint64_t size,struct ttm_operation_ctx * ctx)661 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
662 struct page *page, uint64_t size,
663 struct ttm_operation_ctx *ctx)
664 {
665 struct ttm_mem_zone *zone = NULL;
666
667 /**
668 * Page allocations may be registed in a single zone
669 * only if highmem or !dma32.
670 */
671
672 #ifdef CONFIG_HIGHMEM
673 if (PageHighMem(page) && glob->zone_highmem != NULL)
674 zone = glob->zone_highmem;
675 #else
676 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
677 zone = glob->zone_kernel;
678 #endif
679 return ttm_mem_global_alloc_zone(glob, zone, size, ctx);
680 }
681
ttm_mem_global_free_page(struct ttm_mem_global * glob,struct page * page,uint64_t size)682 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page,
683 uint64_t size)
684 {
685 struct ttm_mem_zone *zone = NULL;
686
687 #ifdef CONFIG_HIGHMEM
688 if (PageHighMem(page) && glob->zone_highmem != NULL)
689 zone = glob->zone_highmem;
690 #else
691 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
692 zone = glob->zone_kernel;
693 #endif
694 ttm_mem_global_free_zone(glob, zone, size);
695 }
696
ttm_round_pot(size_t size)697 size_t ttm_round_pot(size_t size)
698 {
699 if ((size & (size - 1)) == 0)
700 return size;
701 else if (size > PAGE_SIZE)
702 return PAGE_ALIGN(size);
703 else {
704 size_t tmp_size = 4;
705
706 while (tmp_size < size)
707 tmp_size <<= 1;
708
709 return tmp_size;
710 }
711 return 0;
712 }
713 EXPORT_SYMBOL(ttm_round_pot);
714
ttm_get_kernel_zone_memory_size(struct ttm_mem_global * glob)715 uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob)
716 {
717 return glob->zone_kernel->max_mem;
718 }
719 EXPORT_SYMBOL(ttm_get_kernel_zone_memory_size);
720