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