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