1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
28 #include "ttm/ttm_memory.h"
29 #include "ttm/ttm_module.h"
30 #include <linux/spinlock.h>
31 #include <linux/sched.h>
32 #include <linux/wait.h>
34 #include <linux/module.h>
36 #define TTM_MEMORY_ALLOC_RETRIES 4
40 struct ttm_mem_global *glob;
49 static struct attribute ttm_mem_sys = {
50 .name = "zone_memory",
53 static struct attribute ttm_mem_emer = {
54 .name = "emergency_memory",
55 .mode = S_IRUGO | S_IWUSR
57 static struct attribute ttm_mem_max = {
58 .name = "available_memory",
59 .mode = S_IRUGO | S_IWUSR
61 static struct attribute ttm_mem_swap = {
63 .mode = S_IRUGO | S_IWUSR
65 static struct attribute ttm_mem_used = {
66 .name = "used_memory",
70 static void ttm_mem_zone_kobj_release(struct kobject *kobj)
72 struct ttm_mem_zone *zone =
73 container_of(kobj, struct ttm_mem_zone, kobj);
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);
81 static ssize_t ttm_mem_zone_show(struct kobject *kobj,
82 struct attribute *attr,
85 struct ttm_mem_zone *zone =
86 container_of(kobj, struct ttm_mem_zone, kobj);
89 spin_lock(&zone->glob->lock);
90 if (attr == &ttm_mem_sys)
92 else if (attr == &ttm_mem_emer)
94 else if (attr == &ttm_mem_max)
96 else if (attr == &ttm_mem_swap)
97 val = zone->swap_limit;
98 else if (attr == &ttm_mem_used)
100 spin_unlock(&zone->glob->lock);
102 return snprintf(buffer, PAGE_SIZE, "%llu\n",
103 (unsigned long long) val >> 10);
106 static void ttm_check_swapping(struct ttm_mem_global *glob);
108 static ssize_t ttm_mem_zone_store(struct kobject *kobj,
109 struct attribute *attr,
113 struct ttm_mem_zone *zone =
114 container_of(kobj, struct ttm_mem_zone, kobj);
119 chars = sscanf(buffer, "%lu", &val);
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);
141 ttm_check_swapping(zone->glob);
146 static struct attribute *ttm_mem_zone_attrs[] = {
155 static struct sysfs_ops ttm_mem_zone_ops = {
156 .show = &ttm_mem_zone_show,
157 .store = &ttm_mem_zone_store
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,
166 static void ttm_mem_global_kobj_release(struct kobject *kobj)
168 struct ttm_mem_global *glob =
169 container_of(kobj, struct ttm_mem_global, kobj);
174 static struct kobj_type ttm_mem_glob_kobj_type = {
175 .release = &ttm_mem_global_kobj_release,
178 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
179 bool from_wq, uint64_t extra)
182 struct ttm_mem_zone *zone;
185 for (i = 0; i < glob->num_zones; ++i) {
186 zone = glob->zones[i];
189 target = zone->swap_limit;
190 else if (capable(CAP_SYS_ADMIN))
191 target = zone->emer_mem;
193 target = zone->max_mem;
195 target = (extra > target) ? 0ULL : target;
197 if (zone->used_mem > target)
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.
210 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
214 struct ttm_mem_shrink *shrink;
216 spin_lock(&glob->lock);
217 if (glob->shrink == NULL)
220 while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
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))
229 spin_unlock(&glob->lock);
234 static void ttm_shrink_work(struct work_struct *work)
236 struct ttm_mem_global *glob =
237 container_of(work, struct ttm_mem_global, work);
239 ttm_shrink(glob, true, 0ULL);
242 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
243 const struct sysinfo *si)
245 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
252 mem = si->totalram - si->totalhigh;
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);
262 glob->zone_kernel = zone;
263 kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
264 ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
265 if (unlikely(ret != 0)) {
266 kobject_put(&zone->kobj);
269 glob->zones[glob->num_zones++] = zone;
273 #ifdef CONFIG_HIGHMEM
274 static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
275 const struct sysinfo *si)
277 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
284 if (si->totalhigh == 0)
290 zone->name = "highmem";
291 zone->zone_mem = mem;
292 zone->max_mem = mem >> 1;
293 zone->emer_mem = (mem >> 1) + (mem >> 2);
294 zone->swap_limit = zone->max_mem - (mem >> 3);
297 glob->zone_highmem = zone;
298 kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
299 ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
300 if (unlikely(ret != 0)) {
301 kobject_put(&zone->kobj);
304 glob->zones[glob->num_zones++] = zone;
308 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
309 const struct sysinfo *si)
311 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
322 * No special dma32 zone needed.
325 if (mem <= ((uint64_t) 1ULL << 32))
329 * Limit max dma32 memory to 4GB for now
330 * until we can figure out how big this
334 mem = ((uint64_t) 1ULL << 32);
335 zone->name = "dma32";
336 zone->zone_mem = mem;
337 zone->max_mem = mem >> 1;
338 zone->emer_mem = (mem >> 1) + (mem >> 2);
339 zone->swap_limit = zone->max_mem - (mem >> 3);
342 glob->zone_dma32 = zone;
343 kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
344 ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
345 if (unlikely(ret != 0)) {
346 kobject_put(&zone->kobj);
349 glob->zones[glob->num_zones++] = zone;
354 int ttm_mem_global_init(struct ttm_mem_global *glob)
359 struct ttm_mem_zone *zone;
361 spin_lock_init(&glob->lock);
362 glob->swap_queue = create_singlethread_workqueue("ttm_swap");
363 INIT_WORK(&glob->work, ttm_shrink_work);
364 init_waitqueue_head(&glob->queue);
365 kobject_init(&glob->kobj, &ttm_mem_glob_kobj_type);
366 ret = kobject_add(&glob->kobj,
368 "memory_accounting");
369 if (unlikely(ret != 0)) {
370 kobject_put(&glob->kobj);
376 ret = ttm_mem_init_kernel_zone(glob, &si);
377 if (unlikely(ret != 0))
379 #ifdef CONFIG_HIGHMEM
380 ret = ttm_mem_init_highmem_zone(glob, &si);
381 if (unlikely(ret != 0))
384 ret = ttm_mem_init_dma32_zone(glob, &si);
385 if (unlikely(ret != 0))
388 for (i = 0; i < glob->num_zones; ++i) {
389 zone = glob->zones[i];
390 printk(KERN_INFO TTM_PFX
391 "Zone %7s: Available graphics memory: %llu kiB.\n",
392 zone->name, (unsigned long long) zone->max_mem >> 10);
396 ttm_mem_global_release(glob);
399 EXPORT_SYMBOL(ttm_mem_global_init);
401 void ttm_mem_global_release(struct ttm_mem_global *glob)
404 struct ttm_mem_zone *zone;
406 flush_workqueue(glob->swap_queue);
407 destroy_workqueue(glob->swap_queue);
408 glob->swap_queue = NULL;
409 for (i = 0; i < glob->num_zones; ++i) {
410 zone = glob->zones[i];
411 kobject_del(&zone->kobj);
412 kobject_put(&zone->kobj);
414 kobject_del(&glob->kobj);
415 kobject_put(&glob->kobj);
417 EXPORT_SYMBOL(ttm_mem_global_release);
419 static void ttm_check_swapping(struct ttm_mem_global *glob)
421 bool needs_swapping = false;
423 struct ttm_mem_zone *zone;
425 spin_lock(&glob->lock);
426 for (i = 0; i < glob->num_zones; ++i) {
427 zone = glob->zones[i];
428 if (zone->used_mem > zone->swap_limit) {
429 needs_swapping = true;
434 spin_unlock(&glob->lock);
436 if (unlikely(needs_swapping))
437 (void)queue_work(glob->swap_queue, &glob->work);
441 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
442 struct ttm_mem_zone *single_zone,
446 struct ttm_mem_zone *zone;
448 spin_lock(&glob->lock);
449 for (i = 0; i < glob->num_zones; ++i) {
450 zone = glob->zones[i];
451 if (single_zone && zone != single_zone)
453 zone->used_mem -= amount;
455 spin_unlock(&glob->lock);
458 void ttm_mem_global_free(struct ttm_mem_global *glob,
461 return ttm_mem_global_free_zone(glob, NULL, amount);
464 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
465 struct ttm_mem_zone *single_zone,
466 uint64_t amount, bool reserve)
471 struct ttm_mem_zone *zone;
473 spin_lock(&glob->lock);
474 for (i = 0; i < glob->num_zones; ++i) {
475 zone = glob->zones[i];
476 if (single_zone && zone != single_zone)
479 limit = (capable(CAP_SYS_ADMIN)) ?
480 zone->emer_mem : zone->max_mem;
482 if (zone->used_mem > limit)
487 for (i = 0; i < glob->num_zones; ++i) {
488 zone = glob->zones[i];
489 if (single_zone && zone != single_zone)
491 zone->used_mem += amount;
497 spin_unlock(&glob->lock);
498 ttm_check_swapping(glob);
504 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
505 struct ttm_mem_zone *single_zone,
507 bool no_wait, bool interruptible)
509 int count = TTM_MEMORY_ALLOC_RETRIES;
511 while (unlikely(ttm_mem_global_reserve(glob,
517 if (unlikely(count-- == 0))
519 ttm_shrink(glob, false, memory + (memory >> 2) + 16);
525 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
526 bool no_wait, bool interruptible)
529 * Normal allocations of kernel memory are registered in
533 return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
537 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
539 bool no_wait, bool interruptible)
542 struct ttm_mem_zone *zone = NULL;
545 * Page allocations may be registed in a single zone
546 * only if highmem or !dma32.
549 #ifdef CONFIG_HIGHMEM
550 if (PageHighMem(page) && glob->zone_highmem != NULL)
551 zone = glob->zone_highmem;
553 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
554 zone = glob->zone_kernel;
556 return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
560 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
562 struct ttm_mem_zone *zone = NULL;
564 #ifdef CONFIG_HIGHMEM
565 if (PageHighMem(page) && glob->zone_highmem != NULL)
566 zone = glob->zone_highmem;
568 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
569 zone = glob->zone_kernel;
571 ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
575 size_t ttm_round_pot(size_t size)
577 if ((size & (size - 1)) == 0)
579 else if (size > PAGE_SIZE)
580 return PAGE_ALIGN(size);
584 while (tmp_size < size)