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ba4e7d97 TH |
1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | **************************************************************************/ | |
27 | ||
28 | #include "ttm/ttm_memory.h" | |
5fd9cbad | 29 | #include "ttm/ttm_module.h" |
ba4e7d97 TH |
30 | #include <linux/spinlock.h> |
31 | #include <linux/sched.h> | |
32 | #include <linux/wait.h> | |
33 | #include <linux/mm.h> | |
34 | #include <linux/module.h> | |
35 | ||
ba4e7d97 TH |
36 | #define TTM_MEMORY_ALLOC_RETRIES 4 |
37 | ||
5fd9cbad TH |
38 | struct ttm_mem_zone { |
39 | struct kobject kobj; | |
40 | struct ttm_mem_global *glob; | |
41 | const char *name; | |
42 | uint64_t zone_mem; | |
43 | uint64_t emer_mem; | |
44 | uint64_t max_mem; | |
45 | uint64_t swap_limit; | |
46 | uint64_t used_mem; | |
47 | }; | |
48 | ||
49 | static struct attribute ttm_mem_sys = { | |
50 | .name = "zone_memory", | |
51 | .mode = S_IRUGO | |
52 | }; | |
53 | static struct attribute ttm_mem_emer = { | |
54 | .name = "emergency_memory", | |
55 | .mode = S_IRUGO | S_IWUSR | |
56 | }; | |
57 | static struct attribute ttm_mem_max = { | |
58 | .name = "available_memory", | |
59 | .mode = S_IRUGO | S_IWUSR | |
60 | }; | |
61 | static struct attribute ttm_mem_swap = { | |
62 | .name = "swap_limit", | |
63 | .mode = S_IRUGO | S_IWUSR | |
64 | }; | |
65 | static struct attribute ttm_mem_used = { | |
66 | .name = "used_memory", | |
67 | .mode = S_IRUGO | |
68 | }; | |
69 | ||
70 | static void ttm_mem_zone_kobj_release(struct kobject *kobj) | |
71 | { | |
72 | struct ttm_mem_zone *zone = | |
73 | container_of(kobj, struct ttm_mem_zone, kobj); | |
74 | ||
75 | printk(KERN_INFO TTM_PFX | |
76 | "Zone %7s: Used memory at exit: %llu kiB.\n", | |
77 | zone->name, (unsigned long long) zone->used_mem >> 10); | |
78 | kfree(zone); | |
79 | } | |
80 | ||
81 | static ssize_t ttm_mem_zone_show(struct kobject *kobj, | |
82 | struct attribute *attr, | |
83 | char *buffer) | |
84 | { | |
85 | struct ttm_mem_zone *zone = | |
86 | container_of(kobj, struct ttm_mem_zone, kobj); | |
87 | uint64_t val = 0; | |
88 | ||
89 | spin_lock(&zone->glob->lock); | |
90 | if (attr == &ttm_mem_sys) | |
91 | val = zone->zone_mem; | |
92 | else if (attr == &ttm_mem_emer) | |
93 | val = zone->emer_mem; | |
94 | else if (attr == &ttm_mem_max) | |
95 | val = zone->max_mem; | |
96 | else if (attr == &ttm_mem_swap) | |
97 | val = zone->swap_limit; | |
98 | else if (attr == &ttm_mem_used) | |
99 | val = zone->used_mem; | |
100 | spin_unlock(&zone->glob->lock); | |
101 | ||
102 | return snprintf(buffer, PAGE_SIZE, "%llu\n", | |
103 | (unsigned long long) val >> 10); | |
104 | } | |
105 | ||
106 | static void ttm_check_swapping(struct ttm_mem_global *glob); | |
107 | ||
108 | static ssize_t ttm_mem_zone_store(struct kobject *kobj, | |
109 | struct attribute *attr, | |
110 | const char *buffer, | |
111 | size_t size) | |
112 | { | |
113 | struct ttm_mem_zone *zone = | |
114 | container_of(kobj, struct ttm_mem_zone, kobj); | |
115 | int chars; | |
116 | unsigned long val; | |
117 | uint64_t val64; | |
118 | ||
119 | chars = sscanf(buffer, "%lu", &val); | |
120 | if (chars == 0) | |
121 | return size; | |
122 | ||
123 | val64 = val; | |
124 | val64 <<= 10; | |
125 | ||
126 | spin_lock(&zone->glob->lock); | |
127 | if (val64 > zone->zone_mem) | |
128 | val64 = zone->zone_mem; | |
129 | if (attr == &ttm_mem_emer) { | |
130 | zone->emer_mem = val64; | |
131 | if (zone->max_mem > val64) | |
132 | zone->max_mem = val64; | |
133 | } else if (attr == &ttm_mem_max) { | |
134 | zone->max_mem = val64; | |
135 | if (zone->emer_mem < val64) | |
136 | zone->emer_mem = val64; | |
137 | } else if (attr == &ttm_mem_swap) | |
138 | zone->swap_limit = val64; | |
139 | spin_unlock(&zone->glob->lock); | |
140 | ||
141 | ttm_check_swapping(zone->glob); | |
142 | ||
143 | return size; | |
144 | } | |
145 | ||
146 | static struct attribute *ttm_mem_zone_attrs[] = { | |
147 | &ttm_mem_sys, | |
148 | &ttm_mem_emer, | |
149 | &ttm_mem_max, | |
150 | &ttm_mem_swap, | |
151 | &ttm_mem_used, | |
152 | NULL | |
153 | }; | |
154 | ||
155 | static struct sysfs_ops ttm_mem_zone_ops = { | |
156 | .show = &ttm_mem_zone_show, | |
157 | .store = &ttm_mem_zone_store | |
158 | }; | |
159 | ||
160 | static struct kobj_type ttm_mem_zone_kobj_type = { | |
161 | .release = &ttm_mem_zone_kobj_release, | |
162 | .sysfs_ops = &ttm_mem_zone_ops, | |
163 | .default_attrs = ttm_mem_zone_attrs, | |
164 | }; | |
165 | ||
166 | static void ttm_mem_global_kobj_release(struct kobject *kobj) | |
167 | { | |
168 | struct ttm_mem_global *glob = | |
169 | container_of(kobj, struct ttm_mem_global, kobj); | |
170 | ||
171 | kfree(glob); | |
172 | } | |
173 | ||
174 | static struct kobj_type ttm_mem_glob_kobj_type = { | |
175 | .release = &ttm_mem_global_kobj_release, | |
176 | }; | |
177 | ||
178 | static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob, | |
179 | bool from_wq, uint64_t extra) | |
180 | { | |
181 | unsigned int i; | |
182 | struct ttm_mem_zone *zone; | |
183 | uint64_t target; | |
184 | ||
185 | for (i = 0; i < glob->num_zones; ++i) { | |
186 | zone = glob->zones[i]; | |
187 | ||
188 | if (from_wq) | |
189 | target = zone->swap_limit; | |
190 | else if (capable(CAP_SYS_ADMIN)) | |
191 | target = zone->emer_mem; | |
192 | else | |
193 | target = zone->max_mem; | |
194 | ||
195 | target = (extra > target) ? 0ULL : target; | |
196 | ||
197 | if (zone->used_mem > target) | |
198 | return true; | |
199 | } | |
200 | return false; | |
201 | } | |
202 | ||
ba4e7d97 TH |
203 | /** |
204 | * At this point we only support a single shrink callback. | |
205 | * Extend this if needed, perhaps using a linked list of callbacks. | |
206 | * Note that this function is reentrant: | |
207 | * many threads may try to swap out at any given time. | |
208 | */ | |
209 | ||
5fd9cbad | 210 | static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq, |
ba4e7d97 TH |
211 | uint64_t extra) |
212 | { | |
213 | int ret; | |
214 | struct ttm_mem_shrink *shrink; | |
ba4e7d97 TH |
215 | |
216 | spin_lock(&glob->lock); | |
217 | if (glob->shrink == NULL) | |
218 | goto out; | |
219 | ||
5fd9cbad | 220 | while (ttm_zones_above_swap_target(glob, from_wq, extra)) { |
ba4e7d97 TH |
221 | shrink = glob->shrink; |
222 | spin_unlock(&glob->lock); | |
223 | ret = shrink->do_shrink(shrink); | |
224 | spin_lock(&glob->lock); | |
225 | if (unlikely(ret != 0)) | |
226 | goto out; | |
227 | } | |
228 | out: | |
229 | spin_unlock(&glob->lock); | |
230 | } | |
231 | ||
5fd9cbad TH |
232 | |
233 | ||
ba4e7d97 TH |
234 | static void ttm_shrink_work(struct work_struct *work) |
235 | { | |
236 | struct ttm_mem_global *glob = | |
237 | container_of(work, struct ttm_mem_global, work); | |
238 | ||
239 | ttm_shrink(glob, true, 0ULL); | |
240 | } | |
241 | ||
5fd9cbad TH |
242 | static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob, |
243 | const struct sysinfo *si) | |
244 | { | |
245 | struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); | |
246 | uint64_t mem; | |
759e4f83 | 247 | int ret; |
5fd9cbad TH |
248 | |
249 | if (unlikely(!zone)) | |
250 | return -ENOMEM; | |
251 | ||
252 | mem = si->totalram - si->totalhigh; | |
253 | mem *= si->mem_unit; | |
254 | ||
255 | zone->name = "kernel"; | |
256 | zone->zone_mem = mem; | |
257 | zone->max_mem = mem >> 1; | |
258 | zone->emer_mem = (mem >> 1) + (mem >> 2); | |
259 | zone->swap_limit = zone->max_mem - (mem >> 3); | |
260 | zone->used_mem = 0; | |
261 | zone->glob = glob; | |
262 | glob->zone_kernel = zone; | |
5fd9cbad | 263 | kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type); |
759e4f83 TH |
264 | ret = kobject_add(&zone->kobj, &glob->kobj, zone->name); |
265 | if (unlikely(ret != 0)) { | |
266 | kobject_put(&zone->kobj); | |
267 | return ret; | |
268 | } | |
269 | glob->zones[glob->num_zones++] = zone; | |
270 | return 0; | |
5fd9cbad TH |
271 | } |
272 | ||
273 | #ifdef CONFIG_HIGHMEM | |
274 | static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob, | |
275 | const struct sysinfo *si) | |
276 | { | |
46a79fa0 | 277 | struct ttm_mem_zone *zone; |
5fd9cbad | 278 | uint64_t mem; |
759e4f83 | 279 | int ret; |
5fd9cbad | 280 | |
5fd9cbad TH |
281 | if (si->totalhigh == 0) |
282 | return 0; | |
283 | ||
46a79fa0 DC |
284 | zone = kzalloc(sizeof(*zone), GFP_KERNEL); |
285 | if (unlikely(!zone)) | |
286 | return -ENOMEM; | |
287 | ||
5fd9cbad TH |
288 | mem = si->totalram; |
289 | mem *= si->mem_unit; | |
290 | ||
291 | zone->name = "highmem"; | |
292 | zone->zone_mem = mem; | |
293 | zone->max_mem = mem >> 1; | |
294 | zone->emer_mem = (mem >> 1) + (mem >> 2); | |
295 | zone->swap_limit = zone->max_mem - (mem >> 3); | |
296 | zone->used_mem = 0; | |
297 | zone->glob = glob; | |
298 | glob->zone_highmem = zone; | |
5fd9cbad | 299 | kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type); |
759e4f83 TH |
300 | ret = kobject_add(&zone->kobj, &glob->kobj, zone->name); |
301 | if (unlikely(ret != 0)) { | |
302 | kobject_put(&zone->kobj); | |
303 | return ret; | |
304 | } | |
305 | glob->zones[glob->num_zones++] = zone; | |
306 | return 0; | |
5fd9cbad TH |
307 | } |
308 | #else | |
309 | static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob, | |
310 | const struct sysinfo *si) | |
311 | { | |
312 | struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); | |
313 | uint64_t mem; | |
759e4f83 | 314 | int ret; |
5fd9cbad TH |
315 | |
316 | if (unlikely(!zone)) | |
317 | return -ENOMEM; | |
318 | ||
319 | mem = si->totalram; | |
320 | mem *= si->mem_unit; | |
321 | ||
322 | /** | |
323 | * No special dma32 zone needed. | |
324 | */ | |
325 | ||
326 | if (mem <= ((uint64_t) 1ULL << 32)) | |
327 | return 0; | |
328 | ||
329 | /* | |
330 | * Limit max dma32 memory to 4GB for now | |
331 | * until we can figure out how big this | |
332 | * zone really is. | |
333 | */ | |
334 | ||
335 | mem = ((uint64_t) 1ULL << 32); | |
336 | zone->name = "dma32"; | |
337 | zone->zone_mem = mem; | |
338 | zone->max_mem = mem >> 1; | |
339 | zone->emer_mem = (mem >> 1) + (mem >> 2); | |
340 | zone->swap_limit = zone->max_mem - (mem >> 3); | |
341 | zone->used_mem = 0; | |
342 | zone->glob = glob; | |
343 | glob->zone_dma32 = zone; | |
5fd9cbad | 344 | kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type); |
759e4f83 TH |
345 | ret = kobject_add(&zone->kobj, &glob->kobj, zone->name); |
346 | if (unlikely(ret != 0)) { | |
347 | kobject_put(&zone->kobj); | |
348 | return ret; | |
349 | } | |
350 | glob->zones[glob->num_zones++] = zone; | |
351 | return 0; | |
5fd9cbad TH |
352 | } |
353 | #endif | |
354 | ||
ba4e7d97 TH |
355 | int ttm_mem_global_init(struct ttm_mem_global *glob) |
356 | { | |
357 | struct sysinfo si; | |
5fd9cbad TH |
358 | int ret; |
359 | int i; | |
360 | struct ttm_mem_zone *zone; | |
ba4e7d97 TH |
361 | |
362 | spin_lock_init(&glob->lock); | |
363 | glob->swap_queue = create_singlethread_workqueue("ttm_swap"); | |
364 | INIT_WORK(&glob->work, ttm_shrink_work); | |
365 | init_waitqueue_head(&glob->queue); | |
5fd9cbad TH |
366 | kobject_init(&glob->kobj, &ttm_mem_glob_kobj_type); |
367 | ret = kobject_add(&glob->kobj, | |
368 | ttm_get_kobj(), | |
369 | "memory_accounting"); | |
759e4f83 TH |
370 | if (unlikely(ret != 0)) { |
371 | kobject_put(&glob->kobj); | |
372 | return ret; | |
373 | } | |
ba4e7d97 TH |
374 | |
375 | si_meminfo(&si); | |
376 | ||
5fd9cbad TH |
377 | ret = ttm_mem_init_kernel_zone(glob, &si); |
378 | if (unlikely(ret != 0)) | |
379 | goto out_no_zone; | |
380 | #ifdef CONFIG_HIGHMEM | |
381 | ret = ttm_mem_init_highmem_zone(glob, &si); | |
382 | if (unlikely(ret != 0)) | |
383 | goto out_no_zone; | |
384 | #else | |
385 | ret = ttm_mem_init_dma32_zone(glob, &si); | |
386 | if (unlikely(ret != 0)) | |
387 | goto out_no_zone; | |
388 | #endif | |
389 | for (i = 0; i < glob->num_zones; ++i) { | |
390 | zone = glob->zones[i]; | |
391 | printk(KERN_INFO TTM_PFX | |
392 | "Zone %7s: Available graphics memory: %llu kiB.\n", | |
393 | zone->name, (unsigned long long) zone->max_mem >> 10); | |
394 | } | |
ba4e7d97 | 395 | return 0; |
5fd9cbad TH |
396 | out_no_zone: |
397 | ttm_mem_global_release(glob); | |
398 | return ret; | |
ba4e7d97 TH |
399 | } |
400 | EXPORT_SYMBOL(ttm_mem_global_init); | |
401 | ||
402 | void ttm_mem_global_release(struct ttm_mem_global *glob) | |
403 | { | |
5fd9cbad TH |
404 | unsigned int i; |
405 | struct ttm_mem_zone *zone; | |
406 | ||
ba4e7d97 TH |
407 | flush_workqueue(glob->swap_queue); |
408 | destroy_workqueue(glob->swap_queue); | |
409 | glob->swap_queue = NULL; | |
5fd9cbad TH |
410 | for (i = 0; i < glob->num_zones; ++i) { |
411 | zone = glob->zones[i]; | |
412 | kobject_del(&zone->kobj); | |
413 | kobject_put(&zone->kobj); | |
414 | } | |
415 | kobject_del(&glob->kobj); | |
416 | kobject_put(&glob->kobj); | |
ba4e7d97 TH |
417 | } |
418 | EXPORT_SYMBOL(ttm_mem_global_release); | |
419 | ||
5fd9cbad | 420 | static void ttm_check_swapping(struct ttm_mem_global *glob) |
ba4e7d97 | 421 | { |
5fd9cbad TH |
422 | bool needs_swapping = false; |
423 | unsigned int i; | |
424 | struct ttm_mem_zone *zone; | |
ba4e7d97 TH |
425 | |
426 | spin_lock(&glob->lock); | |
5fd9cbad TH |
427 | for (i = 0; i < glob->num_zones; ++i) { |
428 | zone = glob->zones[i]; | |
429 | if (zone->used_mem > zone->swap_limit) { | |
430 | needs_swapping = true; | |
431 | break; | |
432 | } | |
433 | } | |
434 | ||
ba4e7d97 TH |
435 | spin_unlock(&glob->lock); |
436 | ||
437 | if (unlikely(needs_swapping)) | |
438 | (void)queue_work(glob->swap_queue, &glob->work); | |
439 | ||
440 | } | |
441 | ||
5fd9cbad TH |
442 | static void ttm_mem_global_free_zone(struct ttm_mem_global *glob, |
443 | struct ttm_mem_zone *single_zone, | |
444 | uint64_t amount) | |
ba4e7d97 | 445 | { |
5fd9cbad TH |
446 | unsigned int i; |
447 | struct ttm_mem_zone *zone; | |
448 | ||
ba4e7d97 | 449 | spin_lock(&glob->lock); |
5fd9cbad TH |
450 | for (i = 0; i < glob->num_zones; ++i) { |
451 | zone = glob->zones[i]; | |
452 | if (single_zone && zone != single_zone) | |
453 | continue; | |
454 | zone->used_mem -= amount; | |
455 | } | |
ba4e7d97 TH |
456 | spin_unlock(&glob->lock); |
457 | } | |
458 | ||
5fd9cbad TH |
459 | void ttm_mem_global_free(struct ttm_mem_global *glob, |
460 | uint64_t amount) | |
461 | { | |
462 | return ttm_mem_global_free_zone(glob, NULL, amount); | |
463 | } | |
4bfd75cb | 464 | EXPORT_SYMBOL(ttm_mem_global_free); |
5fd9cbad | 465 | |
ba4e7d97 | 466 | static int ttm_mem_global_reserve(struct ttm_mem_global *glob, |
5fd9cbad TH |
467 | struct ttm_mem_zone *single_zone, |
468 | uint64_t amount, bool reserve) | |
ba4e7d97 TH |
469 | { |
470 | uint64_t limit; | |
ba4e7d97 | 471 | int ret = -ENOMEM; |
5fd9cbad TH |
472 | unsigned int i; |
473 | struct ttm_mem_zone *zone; | |
ba4e7d97 TH |
474 | |
475 | spin_lock(&glob->lock); | |
5fd9cbad TH |
476 | for (i = 0; i < glob->num_zones; ++i) { |
477 | zone = glob->zones[i]; | |
478 | if (single_zone && zone != single_zone) | |
479 | continue; | |
ba4e7d97 | 480 | |
5fd9cbad TH |
481 | limit = (capable(CAP_SYS_ADMIN)) ? |
482 | zone->emer_mem : zone->max_mem; | |
ba4e7d97 | 483 | |
5fd9cbad TH |
484 | if (zone->used_mem > limit) |
485 | goto out_unlock; | |
486 | } | |
ba4e7d97 TH |
487 | |
488 | if (reserve) { | |
5fd9cbad TH |
489 | for (i = 0; i < glob->num_zones; ++i) { |
490 | zone = glob->zones[i]; | |
491 | if (single_zone && zone != single_zone) | |
492 | continue; | |
493 | zone->used_mem += amount; | |
494 | } | |
ba4e7d97 | 495 | } |
5fd9cbad | 496 | |
ba4e7d97 TH |
497 | ret = 0; |
498 | out_unlock: | |
499 | spin_unlock(&glob->lock); | |
500 | ttm_check_swapping(glob); | |
501 | ||
502 | return ret; | |
503 | } | |
504 | ||
5fd9cbad TH |
505 | |
506 | static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob, | |
507 | struct ttm_mem_zone *single_zone, | |
508 | uint64_t memory, | |
509 | bool no_wait, bool interruptible) | |
ba4e7d97 TH |
510 | { |
511 | int count = TTM_MEMORY_ALLOC_RETRIES; | |
512 | ||
5fd9cbad TH |
513 | while (unlikely(ttm_mem_global_reserve(glob, |
514 | single_zone, | |
515 | memory, true) | |
ba4e7d97 TH |
516 | != 0)) { |
517 | if (no_wait) | |
518 | return -ENOMEM; | |
519 | if (unlikely(count-- == 0)) | |
520 | return -ENOMEM; | |
521 | ttm_shrink(glob, false, memory + (memory >> 2) + 16); | |
522 | } | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
5fd9cbad TH |
527 | int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, |
528 | bool no_wait, bool interruptible) | |
529 | { | |
530 | /** | |
531 | * Normal allocations of kernel memory are registered in | |
532 | * all zones. | |
533 | */ | |
534 | ||
535 | return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait, | |
536 | interruptible); | |
537 | } | |
4bfd75cb | 538 | EXPORT_SYMBOL(ttm_mem_global_alloc); |
5fd9cbad TH |
539 | |
540 | int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, | |
541 | struct page *page, | |
542 | bool no_wait, bool interruptible) | |
543 | { | |
544 | ||
545 | struct ttm_mem_zone *zone = NULL; | |
546 | ||
547 | /** | |
548 | * Page allocations may be registed in a single zone | |
549 | * only if highmem or !dma32. | |
550 | */ | |
551 | ||
552 | #ifdef CONFIG_HIGHMEM | |
553 | if (PageHighMem(page) && glob->zone_highmem != NULL) | |
554 | zone = glob->zone_highmem; | |
555 | #else | |
556 | if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) | |
557 | zone = glob->zone_kernel; | |
558 | #endif | |
559 | return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait, | |
560 | interruptible); | |
561 | } | |
562 | ||
563 | void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page) | |
564 | { | |
565 | struct ttm_mem_zone *zone = NULL; | |
566 | ||
567 | #ifdef CONFIG_HIGHMEM | |
568 | if (PageHighMem(page) && glob->zone_highmem != NULL) | |
569 | zone = glob->zone_highmem; | |
570 | #else | |
571 | if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) | |
572 | zone = glob->zone_kernel; | |
573 | #endif | |
574 | ttm_mem_global_free_zone(glob, zone, PAGE_SIZE); | |
575 | } | |
576 | ||
577 | ||
ba4e7d97 TH |
578 | size_t ttm_round_pot(size_t size) |
579 | { | |
580 | if ((size & (size - 1)) == 0) | |
581 | return size; | |
582 | else if (size > PAGE_SIZE) | |
583 | return PAGE_ALIGN(size); | |
584 | else { | |
585 | size_t tmp_size = 4; | |
586 | ||
587 | while (tmp_size < size) | |
588 | tmp_size <<= 1; | |
589 | ||
590 | return tmp_size; | |
591 | } | |
592 | return 0; | |
593 | } | |
4bfd75cb | 594 | EXPORT_SYMBOL(ttm_round_pot); |