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 #define pr_fmt(fmt) "[TTM] " fmt
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>
37 #include <linux/module.h>
38 #include <linux/slab.h>
40 #define TTM_MEMORY_ALLOC_RETRIES 4
44 struct ttm_mem_global *glob;
53 static struct attribute ttm_mem_sys = {
54 .name = "zone_memory",
57 static struct attribute ttm_mem_emer = {
58 .name = "emergency_memory",
59 .mode = S_IRUGO | S_IWUSR
61 static struct attribute ttm_mem_max = {
62 .name = "available_memory",
63 .mode = S_IRUGO | S_IWUSR
65 static struct attribute ttm_mem_swap = {
67 .mode = S_IRUGO | S_IWUSR
69 static struct attribute ttm_mem_used = {
70 .name = "used_memory",
74 static void ttm_mem_zone_kobj_release(struct kobject *kobj)
76 struct ttm_mem_zone *zone =
77 container_of(kobj, struct ttm_mem_zone, kobj);
79 pr_info("Zone %7s: Used memory at exit: %llu kiB\n",
80 zone->name, (unsigned long long)zone->used_mem >> 10);
84 static ssize_t ttm_mem_zone_show(struct kobject *kobj,
85 struct attribute *attr,
88 struct ttm_mem_zone *zone =
89 container_of(kobj, struct ttm_mem_zone, kobj);
92 spin_lock(&zone->glob->lock);
93 if (attr == &ttm_mem_sys)
95 else if (attr == &ttm_mem_emer)
97 else if (attr == &ttm_mem_max)
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);
105 return snprintf(buffer, PAGE_SIZE, "%llu\n",
106 (unsigned long long) val >> 10);
109 static void ttm_check_swapping(struct ttm_mem_global *glob);
111 static ssize_t ttm_mem_zone_store(struct kobject *kobj,
112 struct attribute *attr,
116 struct ttm_mem_zone *zone =
117 container_of(kobj, struct ttm_mem_zone, kobj);
122 chars = sscanf(buffer, "%lu", &val);
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);
144 ttm_check_swapping(zone->glob);
149 static struct attribute *ttm_mem_zone_attrs[] = {
158 static const struct sysfs_ops ttm_mem_zone_ops = {
159 .show = &ttm_mem_zone_show,
160 .store = &ttm_mem_zone_store
163 static 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,
169 static void ttm_mem_global_kobj_release(struct kobject *kobj)
171 struct ttm_mem_global *glob =
172 container_of(kobj, struct ttm_mem_global, kobj);
177 static struct kobj_type ttm_mem_glob_kobj_type = {
178 .release = &ttm_mem_global_kobj_release,
181 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
182 bool from_wq, uint64_t extra)
185 struct ttm_mem_zone *zone;
188 for (i = 0; i < glob->num_zones; ++i) {
189 zone = glob->zones[i];
192 target = zone->swap_limit;
193 else if (capable(CAP_SYS_ADMIN))
194 target = zone->emer_mem;
196 target = zone->max_mem;
198 target = (extra > target) ? 0ULL : target;
200 if (zone->used_mem > target)
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.
213 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
217 struct ttm_mem_shrink *shrink;
219 spin_lock(&glob->lock);
220 if (glob->shrink == NULL)
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))
232 spin_unlock(&glob->lock);
237 static void ttm_shrink_work(struct work_struct *work)
239 struct ttm_mem_global *glob =
240 container_of(work, struct ttm_mem_global, work);
242 ttm_shrink(glob, true, 0ULL);
245 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
246 const struct sysinfo *si)
248 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
255 mem = si->totalram - si->totalhigh;
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);
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);
272 glob->zones[glob->num_zones++] = zone;
276 #ifdef CONFIG_HIGHMEM
277 static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
278 const struct sysinfo *si)
280 struct ttm_mem_zone *zone;
284 if (si->totalhigh == 0)
287 zone = kzalloc(sizeof(*zone), GFP_KERNEL);
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);
301 glob->zone_highmem = zone;
302 ret = kobject_init_and_add(
303 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s",
305 if (unlikely(ret != 0)) {
306 kobject_put(&zone->kobj);
309 glob->zones[glob->num_zones++] = zone;
313 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
314 const struct sysinfo *si)
316 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
327 * No special dma32 zone needed.
330 if (mem <= ((uint64_t) 1ULL << 32)) {
336 * Limit max dma32 memory to 4GB for now
337 * until we can figure out how big this
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);
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);
356 glob->zones[glob->num_zones++] = zone;
361 int ttm_mem_global_init(struct ttm_mem_global *glob)
366 struct ttm_mem_zone *zone;
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);
380 ret = ttm_mem_init_kernel_zone(glob, &si);
381 if (unlikely(ret != 0))
383 #ifdef CONFIG_HIGHMEM
384 ret = ttm_mem_init_highmem_zone(glob, &si);
385 if (unlikely(ret != 0))
388 ret = ttm_mem_init_dma32_zone(glob, &si);
389 if (unlikely(ret != 0))
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);
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));
401 ttm_mem_global_release(glob);
404 EXPORT_SYMBOL(ttm_mem_global_init);
406 void ttm_mem_global_release(struct ttm_mem_global *glob)
409 struct ttm_mem_zone *zone;
411 /* let the page allocator first stop the shrink work. */
412 ttm_page_alloc_fini();
413 ttm_dma_page_alloc_fini();
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);
423 kobject_del(&glob->kobj);
424 kobject_put(&glob->kobj);
426 EXPORT_SYMBOL(ttm_mem_global_release);
428 static void ttm_check_swapping(struct ttm_mem_global *glob)
430 bool needs_swapping = false;
432 struct ttm_mem_zone *zone;
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;
443 spin_unlock(&glob->lock);
445 if (unlikely(needs_swapping))
446 (void)queue_work(glob->swap_queue, &glob->work);
450 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
451 struct ttm_mem_zone *single_zone,
455 struct ttm_mem_zone *zone;
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)
462 zone->used_mem -= amount;
464 spin_unlock(&glob->lock);
467 void ttm_mem_global_free(struct ttm_mem_global *glob,
470 return ttm_mem_global_free_zone(glob, NULL, amount);
472 EXPORT_SYMBOL(ttm_mem_global_free);
474 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
475 struct ttm_mem_zone *single_zone,
476 uint64_t amount, bool reserve)
481 struct ttm_mem_zone *zone;
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)
489 limit = (capable(CAP_SYS_ADMIN)) ?
490 zone->emer_mem : zone->max_mem;
492 if (zone->used_mem > limit)
497 for (i = 0; i < glob->num_zones; ++i) {
498 zone = glob->zones[i];
499 if (single_zone && zone != single_zone)
501 zone->used_mem += amount;
507 spin_unlock(&glob->lock);
508 ttm_check_swapping(glob);
514 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
515 struct ttm_mem_zone *single_zone,
517 bool no_wait, bool interruptible)
519 int count = TTM_MEMORY_ALLOC_RETRIES;
521 while (unlikely(ttm_mem_global_reserve(glob,
527 if (unlikely(count-- == 0))
529 ttm_shrink(glob, false, memory + (memory >> 2) + 16);
535 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
536 bool no_wait, bool interruptible)
539 * Normal allocations of kernel memory are registered in
543 return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
546 EXPORT_SYMBOL(ttm_mem_global_alloc);
548 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
549 struct page *page, uint64_t size)
552 struct ttm_mem_zone *zone = NULL;
555 * Page allocations may be registed in a single zone
556 * only if highmem or !dma32.
559 #ifdef CONFIG_HIGHMEM
560 if (PageHighMem(page) && glob->zone_highmem != NULL)
561 zone = glob->zone_highmem;
563 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
564 zone = glob->zone_kernel;
566 return ttm_mem_global_alloc_zone(glob, zone, size, false, false);
569 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page,
572 struct ttm_mem_zone *zone = NULL;
574 #ifdef CONFIG_HIGHMEM
575 if (PageHighMem(page) && glob->zone_highmem != NULL)
576 zone = glob->zone_highmem;
578 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
579 zone = glob->zone_kernel;
581 ttm_mem_global_free_zone(glob, zone, size);
584 size_t ttm_round_pot(size_t size)
586 if ((size & (size - 1)) == 0)
588 else if (size > PAGE_SIZE)
589 return PAGE_ALIGN(size);
593 while (tmp_size < size)
600 EXPORT_SYMBOL(ttm_round_pot);
602 uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob)
604 return glob->zone_kernel->max_mem;
606 EXPORT_SYMBOL(ttm_get_kernel_zone_memory_size);