drm: "kobject_init/kobject_add" -> "kobject_init_and_add".
[linux-2.6.git] / drivers / gpu / drm / ttm / ttm_bo.c
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  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29  */
30 /* Notes:
31  *
32  * We store bo pointer in drm_mm_node struct so we know which bo own a
33  * specific node. There is no protection on the pointer, thus to make
34  * sure things don't go berserk you have to access this pointer while
35  * holding the global lru lock and make sure anytime you free a node you
36  * reset the pointer to NULL.
37  */
38
39 #include "ttm/ttm_module.h"
40 #include "ttm/ttm_bo_driver.h"
41 #include "ttm/ttm_placement.h"
42 #include <linux/jiffies.h>
43 #include <linux/slab.h>
44 #include <linux/sched.h>
45 #include <linux/mm.h>
46 #include <linux/file.h>
47 #include <linux/module.h>
48
49 #define TTM_ASSERT_LOCKED(param)
50 #define TTM_DEBUG(fmt, arg...)
51 #define TTM_BO_HASH_ORDER 13
52
53 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
54 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
55 static void ttm_bo_global_kobj_release(struct kobject *kobj);
56
57 static struct attribute ttm_bo_count = {
58         .name = "bo_count",
59         .mode = S_IRUGO
60 };
61
62 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
63 {
64         int i;
65
66         for (i = 0; i <= TTM_PL_PRIV5; i++)
67                 if (flags & (1 << i)) {
68                         *mem_type = i;
69                         return 0;
70                 }
71         return -EINVAL;
72 }
73
74 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
75 {
76         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
77
78         printk(KERN_ERR TTM_PFX "    has_type: %d\n", man->has_type);
79         printk(KERN_ERR TTM_PFX "    use_type: %d\n", man->use_type);
80         printk(KERN_ERR TTM_PFX "    flags: 0x%08X\n", man->flags);
81         printk(KERN_ERR TTM_PFX "    gpu_offset: 0x%08lX\n", man->gpu_offset);
82         printk(KERN_ERR TTM_PFX "    io_offset: 0x%08lX\n", man->io_offset);
83         printk(KERN_ERR TTM_PFX "    io_size: %ld\n", man->io_size);
84         printk(KERN_ERR TTM_PFX "    size: %llu\n", man->size);
85         printk(KERN_ERR TTM_PFX "    available_caching: 0x%08X\n",
86                 man->available_caching);
87         printk(KERN_ERR TTM_PFX "    default_caching: 0x%08X\n",
88                 man->default_caching);
89         if (mem_type != TTM_PL_SYSTEM) {
90                 spin_lock(&bdev->glob->lru_lock);
91                 drm_mm_debug_table(&man->manager, TTM_PFX);
92                 spin_unlock(&bdev->glob->lru_lock);
93         }
94 }
95
96 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
97                                         struct ttm_placement *placement)
98 {
99         int i, ret, mem_type;
100
101         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
102                 bo, bo->mem.num_pages, bo->mem.size >> 10,
103                 bo->mem.size >> 20);
104         for (i = 0; i < placement->num_placement; i++) {
105                 ret = ttm_mem_type_from_flags(placement->placement[i],
106                                                 &mem_type);
107                 if (ret)
108                         return;
109                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
110                         i, placement->placement[i], mem_type);
111                 ttm_mem_type_debug(bo->bdev, mem_type);
112         }
113 }
114
115 static ssize_t ttm_bo_global_show(struct kobject *kobj,
116                                   struct attribute *attr,
117                                   char *buffer)
118 {
119         struct ttm_bo_global *glob =
120                 container_of(kobj, struct ttm_bo_global, kobj);
121
122         return snprintf(buffer, PAGE_SIZE, "%lu\n",
123                         (unsigned long) atomic_read(&glob->bo_count));
124 }
125
126 static struct attribute *ttm_bo_global_attrs[] = {
127         &ttm_bo_count,
128         NULL
129 };
130
131 static struct sysfs_ops ttm_bo_global_ops = {
132         .show = &ttm_bo_global_show
133 };
134
135 static struct kobj_type ttm_bo_glob_kobj_type  = {
136         .release = &ttm_bo_global_kobj_release,
137         .sysfs_ops = &ttm_bo_global_ops,
138         .default_attrs = ttm_bo_global_attrs
139 };
140
141
142 static inline uint32_t ttm_bo_type_flags(unsigned type)
143 {
144         return 1 << (type);
145 }
146
147 static void ttm_bo_release_list(struct kref *list_kref)
148 {
149         struct ttm_buffer_object *bo =
150             container_of(list_kref, struct ttm_buffer_object, list_kref);
151         struct ttm_bo_device *bdev = bo->bdev;
152
153         BUG_ON(atomic_read(&bo->list_kref.refcount));
154         BUG_ON(atomic_read(&bo->kref.refcount));
155         BUG_ON(atomic_read(&bo->cpu_writers));
156         BUG_ON(bo->sync_obj != NULL);
157         BUG_ON(bo->mem.mm_node != NULL);
158         BUG_ON(!list_empty(&bo->lru));
159         BUG_ON(!list_empty(&bo->ddestroy));
160
161         if (bo->ttm)
162                 ttm_tt_destroy(bo->ttm);
163         atomic_dec(&bo->glob->bo_count);
164         if (bo->destroy)
165                 bo->destroy(bo);
166         else {
167                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
168                 kfree(bo);
169         }
170 }
171
172 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
173 {
174
175         if (interruptible) {
176                 int ret = 0;
177
178                 ret = wait_event_interruptible(bo->event_queue,
179                                                atomic_read(&bo->reserved) == 0);
180                 if (unlikely(ret != 0))
181                         return ret;
182         } else {
183                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
184         }
185         return 0;
186 }
187 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
188
189 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
190 {
191         struct ttm_bo_device *bdev = bo->bdev;
192         struct ttm_mem_type_manager *man;
193
194         BUG_ON(!atomic_read(&bo->reserved));
195
196         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
197
198                 BUG_ON(!list_empty(&bo->lru));
199
200                 man = &bdev->man[bo->mem.mem_type];
201                 list_add_tail(&bo->lru, &man->lru);
202                 kref_get(&bo->list_kref);
203
204                 if (bo->ttm != NULL) {
205                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
206                         kref_get(&bo->list_kref);
207                 }
208         }
209 }
210
211 /**
212  * Call with the lru_lock held.
213  */
214
215 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
216 {
217         int put_count = 0;
218
219         if (!list_empty(&bo->swap)) {
220                 list_del_init(&bo->swap);
221                 ++put_count;
222         }
223         if (!list_empty(&bo->lru)) {
224                 list_del_init(&bo->lru);
225                 ++put_count;
226         }
227
228         /*
229          * TODO: Add a driver hook to delete from
230          * driver-specific LRU's here.
231          */
232
233         return put_count;
234 }
235
236 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
237                           bool interruptible,
238                           bool no_wait, bool use_sequence, uint32_t sequence)
239 {
240         struct ttm_bo_global *glob = bo->glob;
241         int ret;
242
243         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
244                 if (use_sequence && bo->seq_valid &&
245                         (sequence - bo->val_seq < (1 << 31))) {
246                         return -EAGAIN;
247                 }
248
249                 if (no_wait)
250                         return -EBUSY;
251
252                 spin_unlock(&glob->lru_lock);
253                 ret = ttm_bo_wait_unreserved(bo, interruptible);
254                 spin_lock(&glob->lru_lock);
255
256                 if (unlikely(ret))
257                         return ret;
258         }
259
260         if (use_sequence) {
261                 bo->val_seq = sequence;
262                 bo->seq_valid = true;
263         } else {
264                 bo->seq_valid = false;
265         }
266
267         return 0;
268 }
269 EXPORT_SYMBOL(ttm_bo_reserve);
270
271 static void ttm_bo_ref_bug(struct kref *list_kref)
272 {
273         BUG();
274 }
275
276 int ttm_bo_reserve(struct ttm_buffer_object *bo,
277                    bool interruptible,
278                    bool no_wait, bool use_sequence, uint32_t sequence)
279 {
280         struct ttm_bo_global *glob = bo->glob;
281         int put_count = 0;
282         int ret;
283
284         spin_lock(&glob->lru_lock);
285         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
286                                     sequence);
287         if (likely(ret == 0))
288                 put_count = ttm_bo_del_from_lru(bo);
289         spin_unlock(&glob->lru_lock);
290
291         while (put_count--)
292                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
293
294         return ret;
295 }
296
297 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
298 {
299         struct ttm_bo_global *glob = bo->glob;
300
301         spin_lock(&glob->lru_lock);
302         ttm_bo_add_to_lru(bo);
303         atomic_set(&bo->reserved, 0);
304         wake_up_all(&bo->event_queue);
305         spin_unlock(&glob->lru_lock);
306 }
307 EXPORT_SYMBOL(ttm_bo_unreserve);
308
309 /*
310  * Call bo->mutex locked.
311  */
312 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
313 {
314         struct ttm_bo_device *bdev = bo->bdev;
315         struct ttm_bo_global *glob = bo->glob;
316         int ret = 0;
317         uint32_t page_flags = 0;
318
319         TTM_ASSERT_LOCKED(&bo->mutex);
320         bo->ttm = NULL;
321
322         if (bdev->need_dma32)
323                 page_flags |= TTM_PAGE_FLAG_DMA32;
324
325         switch (bo->type) {
326         case ttm_bo_type_device:
327                 if (zero_alloc)
328                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
329         case ttm_bo_type_kernel:
330                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
331                                         page_flags, glob->dummy_read_page);
332                 if (unlikely(bo->ttm == NULL))
333                         ret = -ENOMEM;
334                 break;
335         case ttm_bo_type_user:
336                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
337                                         page_flags | TTM_PAGE_FLAG_USER,
338                                         glob->dummy_read_page);
339                 if (unlikely(bo->ttm == NULL)) {
340                         ret = -ENOMEM;
341                         break;
342                 }
343
344                 ret = ttm_tt_set_user(bo->ttm, current,
345                                       bo->buffer_start, bo->num_pages);
346                 if (unlikely(ret != 0))
347                         ttm_tt_destroy(bo->ttm);
348                 break;
349         default:
350                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
351                 ret = -EINVAL;
352                 break;
353         }
354
355         return ret;
356 }
357
358 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
359                                   struct ttm_mem_reg *mem,
360                                   bool evict, bool interruptible, bool no_wait)
361 {
362         struct ttm_bo_device *bdev = bo->bdev;
363         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
364         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
365         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
366         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
367         int ret = 0;
368
369         if (old_is_pci || new_is_pci ||
370             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
371                 ttm_bo_unmap_virtual(bo);
372
373         /*
374          * Create and bind a ttm if required.
375          */
376
377         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
378                 ret = ttm_bo_add_ttm(bo, false);
379                 if (ret)
380                         goto out_err;
381
382                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
383                 if (ret)
384                         goto out_err;
385
386                 if (mem->mem_type != TTM_PL_SYSTEM) {
387                         ret = ttm_tt_bind(bo->ttm, mem);
388                         if (ret)
389                                 goto out_err;
390                 }
391
392                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
393                         bo->mem = *mem;
394                         mem->mm_node = NULL;
395                         goto moved;
396                 }
397
398         }
399
400         if (bdev->driver->move_notify)
401                 bdev->driver->move_notify(bo, mem);
402
403         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
404             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
405                 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
406         else if (bdev->driver->move)
407                 ret = bdev->driver->move(bo, evict, interruptible,
408                                          no_wait, mem);
409         else
410                 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
411
412         if (ret)
413                 goto out_err;
414
415 moved:
416         if (bo->evicted) {
417                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
418                 if (ret)
419                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
420                 bo->evicted = false;
421         }
422
423         if (bo->mem.mm_node) {
424                 spin_lock(&bo->lock);
425                 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
426                     bdev->man[bo->mem.mem_type].gpu_offset;
427                 bo->cur_placement = bo->mem.placement;
428                 spin_unlock(&bo->lock);
429         } else
430                 bo->offset = 0;
431
432         return 0;
433
434 out_err:
435         new_man = &bdev->man[bo->mem.mem_type];
436         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
437                 ttm_tt_unbind(bo->ttm);
438                 ttm_tt_destroy(bo->ttm);
439                 bo->ttm = NULL;
440         }
441
442         return ret;
443 }
444
445 /**
446  * If bo idle, remove from delayed- and lru lists, and unref.
447  * If not idle, and already on delayed list, do nothing.
448  * If not idle, and not on delayed list, put on delayed list,
449  *   up the list_kref and schedule a delayed list check.
450  */
451
452 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
453 {
454         struct ttm_bo_device *bdev = bo->bdev;
455         struct ttm_bo_global *glob = bo->glob;
456         struct ttm_bo_driver *driver = bdev->driver;
457         int ret;
458
459         spin_lock(&bo->lock);
460         (void) ttm_bo_wait(bo, false, false, !remove_all);
461
462         if (!bo->sync_obj) {
463                 int put_count;
464
465                 spin_unlock(&bo->lock);
466
467                 spin_lock(&glob->lru_lock);
468                 put_count = ttm_bo_del_from_lru(bo);
469
470                 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
471                 BUG_ON(ret);
472                 if (bo->ttm)
473                         ttm_tt_unbind(bo->ttm);
474
475                 if (!list_empty(&bo->ddestroy)) {
476                         list_del_init(&bo->ddestroy);
477                         ++put_count;
478                 }
479                 if (bo->mem.mm_node) {
480                         bo->mem.mm_node->private = NULL;
481                         drm_mm_put_block(bo->mem.mm_node);
482                         bo->mem.mm_node = NULL;
483                 }
484                 spin_unlock(&glob->lru_lock);
485
486                 atomic_set(&bo->reserved, 0);
487
488                 while (put_count--)
489                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
490
491                 return 0;
492         }
493
494         spin_lock(&glob->lru_lock);
495         if (list_empty(&bo->ddestroy)) {
496                 void *sync_obj = bo->sync_obj;
497                 void *sync_obj_arg = bo->sync_obj_arg;
498
499                 kref_get(&bo->list_kref);
500                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
501                 spin_unlock(&glob->lru_lock);
502                 spin_unlock(&bo->lock);
503
504                 if (sync_obj)
505                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
506                 schedule_delayed_work(&bdev->wq,
507                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
508                 ret = 0;
509
510         } else {
511                 spin_unlock(&glob->lru_lock);
512                 spin_unlock(&bo->lock);
513                 ret = -EBUSY;
514         }
515
516         return ret;
517 }
518
519 /**
520  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
521  * encountered buffers.
522  */
523
524 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
525 {
526         struct ttm_bo_global *glob = bdev->glob;
527         struct ttm_buffer_object *entry = NULL;
528         int ret = 0;
529
530         spin_lock(&glob->lru_lock);
531         if (list_empty(&bdev->ddestroy))
532                 goto out_unlock;
533
534         entry = list_first_entry(&bdev->ddestroy,
535                 struct ttm_buffer_object, ddestroy);
536         kref_get(&entry->list_kref);
537
538         for (;;) {
539                 struct ttm_buffer_object *nentry = NULL;
540
541                 if (entry->ddestroy.next != &bdev->ddestroy) {
542                         nentry = list_first_entry(&entry->ddestroy,
543                                 struct ttm_buffer_object, ddestroy);
544                         kref_get(&nentry->list_kref);
545                 }
546
547                 spin_unlock(&glob->lru_lock);
548                 ret = ttm_bo_cleanup_refs(entry, remove_all);
549                 kref_put(&entry->list_kref, ttm_bo_release_list);
550                 entry = nentry;
551
552                 if (ret || !entry)
553                         goto out;
554
555                 spin_lock(&glob->lru_lock);
556                 if (list_empty(&entry->ddestroy))
557                         break;
558         }
559
560 out_unlock:
561         spin_unlock(&glob->lru_lock);
562 out:
563         if (entry)
564                 kref_put(&entry->list_kref, ttm_bo_release_list);
565         return ret;
566 }
567
568 static void ttm_bo_delayed_workqueue(struct work_struct *work)
569 {
570         struct ttm_bo_device *bdev =
571             container_of(work, struct ttm_bo_device, wq.work);
572
573         if (ttm_bo_delayed_delete(bdev, false)) {
574                 schedule_delayed_work(&bdev->wq,
575                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
576         }
577 }
578
579 static void ttm_bo_release(struct kref *kref)
580 {
581         struct ttm_buffer_object *bo =
582             container_of(kref, struct ttm_buffer_object, kref);
583         struct ttm_bo_device *bdev = bo->bdev;
584
585         if (likely(bo->vm_node != NULL)) {
586                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
587                 drm_mm_put_block(bo->vm_node);
588                 bo->vm_node = NULL;
589         }
590         write_unlock(&bdev->vm_lock);
591         ttm_bo_cleanup_refs(bo, false);
592         kref_put(&bo->list_kref, ttm_bo_release_list);
593         write_lock(&bdev->vm_lock);
594 }
595
596 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
597 {
598         struct ttm_buffer_object *bo = *p_bo;
599         struct ttm_bo_device *bdev = bo->bdev;
600
601         *p_bo = NULL;
602         write_lock(&bdev->vm_lock);
603         kref_put(&bo->kref, ttm_bo_release);
604         write_unlock(&bdev->vm_lock);
605 }
606 EXPORT_SYMBOL(ttm_bo_unref);
607
608 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
609                         bool no_wait)
610 {
611         struct ttm_bo_device *bdev = bo->bdev;
612         struct ttm_bo_global *glob = bo->glob;
613         struct ttm_mem_reg evict_mem;
614         struct ttm_placement placement;
615         int ret = 0;
616
617         spin_lock(&bo->lock);
618         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
619         spin_unlock(&bo->lock);
620
621         if (unlikely(ret != 0)) {
622                 if (ret != -ERESTARTSYS) {
623                         printk(KERN_ERR TTM_PFX
624                                "Failed to expire sync object before "
625                                "buffer eviction.\n");
626                 }
627                 goto out;
628         }
629
630         BUG_ON(!atomic_read(&bo->reserved));
631
632         evict_mem = bo->mem;
633         evict_mem.mm_node = NULL;
634
635         placement.fpfn = 0;
636         placement.lpfn = 0;
637         placement.num_placement = 0;
638         placement.num_busy_placement = 0;
639         bdev->driver->evict_flags(bo, &placement);
640         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
641                                 no_wait);
642         if (ret) {
643                 if (ret != -ERESTARTSYS) {
644                         printk(KERN_ERR TTM_PFX
645                                "Failed to find memory space for "
646                                "buffer 0x%p eviction.\n", bo);
647                         ttm_bo_mem_space_debug(bo, &placement);
648                 }
649                 goto out;
650         }
651
652         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
653                                      no_wait);
654         if (ret) {
655                 if (ret != -ERESTARTSYS)
656                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
657                 spin_lock(&glob->lru_lock);
658                 if (evict_mem.mm_node) {
659                         evict_mem.mm_node->private = NULL;
660                         drm_mm_put_block(evict_mem.mm_node);
661                         evict_mem.mm_node = NULL;
662                 }
663                 spin_unlock(&glob->lru_lock);
664                 goto out;
665         }
666         bo->evicted = true;
667 out:
668         return ret;
669 }
670
671 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
672                                 uint32_t mem_type,
673                                 bool interruptible, bool no_wait)
674 {
675         struct ttm_bo_global *glob = bdev->glob;
676         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
677         struct ttm_buffer_object *bo;
678         int ret, put_count = 0;
679
680 retry:
681         spin_lock(&glob->lru_lock);
682         if (list_empty(&man->lru)) {
683                 spin_unlock(&glob->lru_lock);
684                 return -EBUSY;
685         }
686
687         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
688         kref_get(&bo->list_kref);
689
690         ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
691
692         if (unlikely(ret == -EBUSY)) {
693                 spin_unlock(&glob->lru_lock);
694                 if (likely(!no_wait))
695                         ret = ttm_bo_wait_unreserved(bo, interruptible);
696
697                 kref_put(&bo->list_kref, ttm_bo_release_list);
698
699                 /**
700                  * We *need* to retry after releasing the lru lock.
701                  */
702
703                 if (unlikely(ret != 0))
704                         return ret;
705                 goto retry;
706         }
707
708         put_count = ttm_bo_del_from_lru(bo);
709         spin_unlock(&glob->lru_lock);
710
711         BUG_ON(ret != 0);
712
713         while (put_count--)
714                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
715
716         ret = ttm_bo_evict(bo, interruptible, no_wait);
717         ttm_bo_unreserve(bo);
718
719         kref_put(&bo->list_kref, ttm_bo_release_list);
720         return ret;
721 }
722
723 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
724                                 struct ttm_mem_type_manager *man,
725                                 struct ttm_placement *placement,
726                                 struct ttm_mem_reg *mem,
727                                 struct drm_mm_node **node)
728 {
729         struct ttm_bo_global *glob = bo->glob;
730         unsigned long lpfn;
731         int ret;
732
733         lpfn = placement->lpfn;
734         if (!lpfn)
735                 lpfn = man->size;
736         *node = NULL;
737         do {
738                 ret = drm_mm_pre_get(&man->manager);
739                 if (unlikely(ret))
740                         return ret;
741
742                 spin_lock(&glob->lru_lock);
743                 *node = drm_mm_search_free_in_range(&man->manager,
744                                         mem->num_pages, mem->page_alignment,
745                                         placement->fpfn, lpfn, 1);
746                 if (unlikely(*node == NULL)) {
747                         spin_unlock(&glob->lru_lock);
748                         return 0;
749                 }
750                 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
751                                                         mem->page_alignment,
752                                                         placement->fpfn,
753                                                         lpfn);
754                 spin_unlock(&glob->lru_lock);
755         } while (*node == NULL);
756         return 0;
757 }
758
759 /**
760  * Repeatedly evict memory from the LRU for @mem_type until we create enough
761  * space, or we've evicted everything and there isn't enough space.
762  */
763 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
764                                         uint32_t mem_type,
765                                         struct ttm_placement *placement,
766                                         struct ttm_mem_reg *mem,
767                                         bool interruptible, bool no_wait)
768 {
769         struct ttm_bo_device *bdev = bo->bdev;
770         struct ttm_bo_global *glob = bdev->glob;
771         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
772         struct drm_mm_node *node;
773         int ret;
774
775         do {
776                 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
777                 if (unlikely(ret != 0))
778                         return ret;
779                 if (node)
780                         break;
781                 spin_lock(&glob->lru_lock);
782                 if (list_empty(&man->lru)) {
783                         spin_unlock(&glob->lru_lock);
784                         break;
785                 }
786                 spin_unlock(&glob->lru_lock);
787                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
788                                                 no_wait);
789                 if (unlikely(ret != 0))
790                         return ret;
791         } while (1);
792         if (node == NULL)
793                 return -ENOMEM;
794         mem->mm_node = node;
795         mem->mem_type = mem_type;
796         return 0;
797 }
798
799 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
800                                       uint32_t cur_placement,
801                                       uint32_t proposed_placement)
802 {
803         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
804         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
805
806         /**
807          * Keep current caching if possible.
808          */
809
810         if ((cur_placement & caching) != 0)
811                 result |= (cur_placement & caching);
812         else if ((man->default_caching & caching) != 0)
813                 result |= man->default_caching;
814         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
815                 result |= TTM_PL_FLAG_CACHED;
816         else if ((TTM_PL_FLAG_WC & caching) != 0)
817                 result |= TTM_PL_FLAG_WC;
818         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
819                 result |= TTM_PL_FLAG_UNCACHED;
820
821         return result;
822 }
823
824 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
825                                  bool disallow_fixed,
826                                  uint32_t mem_type,
827                                  uint32_t proposed_placement,
828                                  uint32_t *masked_placement)
829 {
830         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
831
832         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
833                 return false;
834
835         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
836                 return false;
837
838         if ((proposed_placement & man->available_caching) == 0)
839                 return false;
840
841         cur_flags |= (proposed_placement & man->available_caching);
842
843         *masked_placement = cur_flags;
844         return true;
845 }
846
847 /**
848  * Creates space for memory region @mem according to its type.
849  *
850  * This function first searches for free space in compatible memory types in
851  * the priority order defined by the driver.  If free space isn't found, then
852  * ttm_bo_mem_force_space is attempted in priority order to evict and find
853  * space.
854  */
855 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
856                         struct ttm_placement *placement,
857                         struct ttm_mem_reg *mem,
858                         bool interruptible, bool no_wait)
859 {
860         struct ttm_bo_device *bdev = bo->bdev;
861         struct ttm_mem_type_manager *man;
862         uint32_t mem_type = TTM_PL_SYSTEM;
863         uint32_t cur_flags = 0;
864         bool type_found = false;
865         bool type_ok = false;
866         bool has_erestartsys = false;
867         struct drm_mm_node *node = NULL;
868         int i, ret;
869
870         mem->mm_node = NULL;
871         for (i = 0; i < placement->num_placement; ++i) {
872                 ret = ttm_mem_type_from_flags(placement->placement[i],
873                                                 &mem_type);
874                 if (ret)
875                         return ret;
876                 man = &bdev->man[mem_type];
877
878                 type_ok = ttm_bo_mt_compatible(man,
879                                                 bo->type == ttm_bo_type_user,
880                                                 mem_type,
881                                                 placement->placement[i],
882                                                 &cur_flags);
883
884                 if (!type_ok)
885                         continue;
886
887                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
888                                                   cur_flags);
889                 /*
890                  * Use the access and other non-mapping-related flag bits from
891                  * the memory placement flags to the current flags
892                  */
893                 ttm_flag_masked(&cur_flags, placement->placement[i],
894                                 ~TTM_PL_MASK_MEMTYPE);
895
896                 if (mem_type == TTM_PL_SYSTEM)
897                         break;
898
899                 if (man->has_type && man->use_type) {
900                         type_found = true;
901                         ret = ttm_bo_man_get_node(bo, man, placement, mem,
902                                                         &node);
903                         if (unlikely(ret))
904                                 return ret;
905                 }
906                 if (node)
907                         break;
908         }
909
910         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
911                 mem->mm_node = node;
912                 mem->mem_type = mem_type;
913                 mem->placement = cur_flags;
914                 if (node)
915                         node->private = bo;
916                 return 0;
917         }
918
919         if (!type_found)
920                 return -EINVAL;
921
922         for (i = 0; i < placement->num_busy_placement; ++i) {
923                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
924                                                 &mem_type);
925                 if (ret)
926                         return ret;
927                 man = &bdev->man[mem_type];
928                 if (!man->has_type)
929                         continue;
930                 if (!ttm_bo_mt_compatible(man,
931                                                 bo->type == ttm_bo_type_user,
932                                                 mem_type,
933                                                 placement->busy_placement[i],
934                                                 &cur_flags))
935                         continue;
936
937                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
938                                                   cur_flags);
939                 /*
940                  * Use the access and other non-mapping-related flag bits from
941                  * the memory placement flags to the current flags
942                  */
943                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
944                                 ~TTM_PL_MASK_MEMTYPE);
945
946
947                 if (mem_type == TTM_PL_SYSTEM) {
948                         mem->mem_type = mem_type;
949                         mem->placement = cur_flags;
950                         mem->mm_node = NULL;
951                         return 0;
952                 }
953
954                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
955                                                 interruptible, no_wait);
956                 if (ret == 0 && mem->mm_node) {
957                         mem->placement = cur_flags;
958                         mem->mm_node->private = bo;
959                         return 0;
960                 }
961                 if (ret == -ERESTARTSYS)
962                         has_erestartsys = true;
963         }
964         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
965         return ret;
966 }
967 EXPORT_SYMBOL(ttm_bo_mem_space);
968
969 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
970 {
971         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
972                 return -EBUSY;
973
974         return wait_event_interruptible(bo->event_queue,
975                                         atomic_read(&bo->cpu_writers) == 0);
976 }
977 EXPORT_SYMBOL(ttm_bo_wait_cpu);
978
979 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
980                         struct ttm_placement *placement,
981                         bool interruptible, bool no_wait)
982 {
983         struct ttm_bo_global *glob = bo->glob;
984         int ret = 0;
985         struct ttm_mem_reg mem;
986
987         BUG_ON(!atomic_read(&bo->reserved));
988
989         /*
990          * FIXME: It's possible to pipeline buffer moves.
991          * Have the driver move function wait for idle when necessary,
992          * instead of doing it here.
993          */
994         spin_lock(&bo->lock);
995         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
996         spin_unlock(&bo->lock);
997         if (ret)
998                 return ret;
999         mem.num_pages = bo->num_pages;
1000         mem.size = mem.num_pages << PAGE_SHIFT;
1001         mem.page_alignment = bo->mem.page_alignment;
1002         /*
1003          * Determine where to move the buffer.
1004          */
1005         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait);
1006         if (ret)
1007                 goto out_unlock;
1008         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
1009 out_unlock:
1010         if (ret && mem.mm_node) {
1011                 spin_lock(&glob->lru_lock);
1012                 mem.mm_node->private = NULL;
1013                 drm_mm_put_block(mem.mm_node);
1014                 spin_unlock(&glob->lru_lock);
1015         }
1016         return ret;
1017 }
1018
1019 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1020                              struct ttm_mem_reg *mem)
1021 {
1022         int i;
1023         struct drm_mm_node *node = mem->mm_node;
1024
1025         if (node && placement->lpfn != 0 &&
1026             (node->start < placement->fpfn ||
1027              node->start + node->size > placement->lpfn))
1028                 return -1;
1029
1030         for (i = 0; i < placement->num_placement; i++) {
1031                 if ((placement->placement[i] & mem->placement &
1032                         TTM_PL_MASK_CACHING) &&
1033                         (placement->placement[i] & mem->placement &
1034                         TTM_PL_MASK_MEM))
1035                         return i;
1036         }
1037         return -1;
1038 }
1039
1040 int ttm_bo_validate(struct ttm_buffer_object *bo,
1041                         struct ttm_placement *placement,
1042                         bool interruptible, bool no_wait)
1043 {
1044         int ret;
1045
1046         BUG_ON(!atomic_read(&bo->reserved));
1047         /* Check that range is valid */
1048         if (placement->lpfn || placement->fpfn)
1049                 if (placement->fpfn > placement->lpfn ||
1050                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1051                         return -EINVAL;
1052         /*
1053          * Check whether we need to move buffer.
1054          */
1055         ret = ttm_bo_mem_compat(placement, &bo->mem);
1056         if (ret < 0) {
1057                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait);
1058                 if (ret)
1059                         return ret;
1060         } else {
1061                 /*
1062                  * Use the access and other non-mapping-related flag bits from
1063                  * the compatible memory placement flags to the active flags
1064                  */
1065                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1066                                 ~TTM_PL_MASK_MEMTYPE);
1067         }
1068         /*
1069          * We might need to add a TTM.
1070          */
1071         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1072                 ret = ttm_bo_add_ttm(bo, true);
1073                 if (ret)
1074                         return ret;
1075         }
1076         return 0;
1077 }
1078 EXPORT_SYMBOL(ttm_bo_validate);
1079
1080 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1081                                 struct ttm_placement *placement)
1082 {
1083         int i;
1084
1085         if (placement->fpfn || placement->lpfn) {
1086                 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1087                         printk(KERN_ERR TTM_PFX "Page number range to small "
1088                                 "Need %lu pages, range is [%u, %u]\n",
1089                                 bo->mem.num_pages, placement->fpfn,
1090                                 placement->lpfn);
1091                         return -EINVAL;
1092                 }
1093         }
1094         for (i = 0; i < placement->num_placement; i++) {
1095                 if (!capable(CAP_SYS_ADMIN)) {
1096                         if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1097                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1098                                         "modify NO_EVICT status.\n");
1099                                 return -EINVAL;
1100                         }
1101                 }
1102         }
1103         for (i = 0; i < placement->num_busy_placement; i++) {
1104                 if (!capable(CAP_SYS_ADMIN)) {
1105                         if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1106                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1107                                         "modify NO_EVICT status.\n");
1108                                 return -EINVAL;
1109                         }
1110                 }
1111         }
1112         return 0;
1113 }
1114
1115 int ttm_bo_init(struct ttm_bo_device *bdev,
1116                 struct ttm_buffer_object *bo,
1117                 unsigned long size,
1118                 enum ttm_bo_type type,
1119                 struct ttm_placement *placement,
1120                 uint32_t page_alignment,
1121                 unsigned long buffer_start,
1122                 bool interruptible,
1123                 struct file *persistant_swap_storage,
1124                 size_t acc_size,
1125                 void (*destroy) (struct ttm_buffer_object *))
1126 {
1127         int ret = 0;
1128         unsigned long num_pages;
1129
1130         size += buffer_start & ~PAGE_MASK;
1131         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1132         if (num_pages == 0) {
1133                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1134                 return -EINVAL;
1135         }
1136         bo->destroy = destroy;
1137
1138         spin_lock_init(&bo->lock);
1139         kref_init(&bo->kref);
1140         kref_init(&bo->list_kref);
1141         atomic_set(&bo->cpu_writers, 0);
1142         atomic_set(&bo->reserved, 1);
1143         init_waitqueue_head(&bo->event_queue);
1144         INIT_LIST_HEAD(&bo->lru);
1145         INIT_LIST_HEAD(&bo->ddestroy);
1146         INIT_LIST_HEAD(&bo->swap);
1147         bo->bdev = bdev;
1148         bo->glob = bdev->glob;
1149         bo->type = type;
1150         bo->num_pages = num_pages;
1151         bo->mem.size = num_pages << PAGE_SHIFT;
1152         bo->mem.mem_type = TTM_PL_SYSTEM;
1153         bo->mem.num_pages = bo->num_pages;
1154         bo->mem.mm_node = NULL;
1155         bo->mem.page_alignment = page_alignment;
1156         bo->buffer_start = buffer_start & PAGE_MASK;
1157         bo->priv_flags = 0;
1158         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1159         bo->seq_valid = false;
1160         bo->persistant_swap_storage = persistant_swap_storage;
1161         bo->acc_size = acc_size;
1162         atomic_inc(&bo->glob->bo_count);
1163
1164         ret = ttm_bo_check_placement(bo, placement);
1165         if (unlikely(ret != 0))
1166                 goto out_err;
1167
1168         /*
1169          * For ttm_bo_type_device buffers, allocate
1170          * address space from the device.
1171          */
1172         if (bo->type == ttm_bo_type_device) {
1173                 ret = ttm_bo_setup_vm(bo);
1174                 if (ret)
1175                         goto out_err;
1176         }
1177
1178         ret = ttm_bo_validate(bo, placement, interruptible, false);
1179         if (ret)
1180                 goto out_err;
1181
1182         ttm_bo_unreserve(bo);
1183         return 0;
1184
1185 out_err:
1186         ttm_bo_unreserve(bo);
1187         ttm_bo_unref(&bo);
1188
1189         return ret;
1190 }
1191 EXPORT_SYMBOL(ttm_bo_init);
1192
1193 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1194                                  unsigned long num_pages)
1195 {
1196         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1197             PAGE_MASK;
1198
1199         return glob->ttm_bo_size + 2 * page_array_size;
1200 }
1201
1202 int ttm_bo_create(struct ttm_bo_device *bdev,
1203                         unsigned long size,
1204                         enum ttm_bo_type type,
1205                         struct ttm_placement *placement,
1206                         uint32_t page_alignment,
1207                         unsigned long buffer_start,
1208                         bool interruptible,
1209                         struct file *persistant_swap_storage,
1210                         struct ttm_buffer_object **p_bo)
1211 {
1212         struct ttm_buffer_object *bo;
1213         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1214         int ret;
1215
1216         size_t acc_size =
1217             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1218         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1219         if (unlikely(ret != 0))
1220                 return ret;
1221
1222         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1223
1224         if (unlikely(bo == NULL)) {
1225                 ttm_mem_global_free(mem_glob, acc_size);
1226                 return -ENOMEM;
1227         }
1228
1229         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1230                                 buffer_start, interruptible,
1231                                 persistant_swap_storage, acc_size, NULL);
1232         if (likely(ret == 0))
1233                 *p_bo = bo;
1234
1235         return ret;
1236 }
1237
1238 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1239                                         unsigned mem_type, bool allow_errors)
1240 {
1241         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1242         struct ttm_bo_global *glob = bdev->glob;
1243         int ret;
1244
1245         /*
1246          * Can't use standard list traversal since we're unlocking.
1247          */
1248
1249         spin_lock(&glob->lru_lock);
1250         while (!list_empty(&man->lru)) {
1251                 spin_unlock(&glob->lru_lock);
1252                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1253                 if (ret) {
1254                         if (allow_errors) {
1255                                 return ret;
1256                         } else {
1257                                 printk(KERN_ERR TTM_PFX
1258                                         "Cleanup eviction failed\n");
1259                         }
1260                 }
1261                 spin_lock(&glob->lru_lock);
1262         }
1263         spin_unlock(&glob->lru_lock);
1264         return 0;
1265 }
1266
1267 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1268 {
1269         struct ttm_bo_global *glob = bdev->glob;
1270         struct ttm_mem_type_manager *man;
1271         int ret = -EINVAL;
1272
1273         if (mem_type >= TTM_NUM_MEM_TYPES) {
1274                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1275                 return ret;
1276         }
1277         man = &bdev->man[mem_type];
1278
1279         if (!man->has_type) {
1280                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1281                        "memory manager type %u\n", mem_type);
1282                 return ret;
1283         }
1284
1285         man->use_type = false;
1286         man->has_type = false;
1287
1288         ret = 0;
1289         if (mem_type > 0) {
1290                 ttm_bo_force_list_clean(bdev, mem_type, false);
1291
1292                 spin_lock(&glob->lru_lock);
1293                 if (drm_mm_clean(&man->manager))
1294                         drm_mm_takedown(&man->manager);
1295                 else
1296                         ret = -EBUSY;
1297
1298                 spin_unlock(&glob->lru_lock);
1299         }
1300
1301         return ret;
1302 }
1303 EXPORT_SYMBOL(ttm_bo_clean_mm);
1304
1305 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1306 {
1307         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1308
1309         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1310                 printk(KERN_ERR TTM_PFX
1311                        "Illegal memory manager memory type %u.\n",
1312                        mem_type);
1313                 return -EINVAL;
1314         }
1315
1316         if (!man->has_type) {
1317                 printk(KERN_ERR TTM_PFX
1318                        "Memory type %u has not been initialized.\n",
1319                        mem_type);
1320                 return 0;
1321         }
1322
1323         return ttm_bo_force_list_clean(bdev, mem_type, true);
1324 }
1325 EXPORT_SYMBOL(ttm_bo_evict_mm);
1326
1327 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1328                         unsigned long p_size)
1329 {
1330         int ret = -EINVAL;
1331         struct ttm_mem_type_manager *man;
1332
1333         if (type >= TTM_NUM_MEM_TYPES) {
1334                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1335                 return ret;
1336         }
1337
1338         man = &bdev->man[type];
1339         if (man->has_type) {
1340                 printk(KERN_ERR TTM_PFX
1341                        "Memory manager already initialized for type %d\n",
1342                        type);
1343                 return ret;
1344         }
1345
1346         ret = bdev->driver->init_mem_type(bdev, type, man);
1347         if (ret)
1348                 return ret;
1349
1350         ret = 0;
1351         if (type != TTM_PL_SYSTEM) {
1352                 if (!p_size) {
1353                         printk(KERN_ERR TTM_PFX
1354                                "Zero size memory manager type %d\n",
1355                                type);
1356                         return ret;
1357                 }
1358                 ret = drm_mm_init(&man->manager, 0, p_size);
1359                 if (ret)
1360                         return ret;
1361         }
1362         man->has_type = true;
1363         man->use_type = true;
1364         man->size = p_size;
1365
1366         INIT_LIST_HEAD(&man->lru);
1367
1368         return 0;
1369 }
1370 EXPORT_SYMBOL(ttm_bo_init_mm);
1371
1372 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1373 {
1374         struct ttm_bo_global *glob =
1375                 container_of(kobj, struct ttm_bo_global, kobj);
1376
1377         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1378         __free_page(glob->dummy_read_page);
1379         kfree(glob);
1380 }
1381
1382 void ttm_bo_global_release(struct ttm_global_reference *ref)
1383 {
1384         struct ttm_bo_global *glob = ref->object;
1385
1386         kobject_del(&glob->kobj);
1387         kobject_put(&glob->kobj);
1388 }
1389 EXPORT_SYMBOL(ttm_bo_global_release);
1390
1391 int ttm_bo_global_init(struct ttm_global_reference *ref)
1392 {
1393         struct ttm_bo_global_ref *bo_ref =
1394                 container_of(ref, struct ttm_bo_global_ref, ref);
1395         struct ttm_bo_global *glob = ref->object;
1396         int ret;
1397
1398         mutex_init(&glob->device_list_mutex);
1399         spin_lock_init(&glob->lru_lock);
1400         glob->mem_glob = bo_ref->mem_glob;
1401         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1402
1403         if (unlikely(glob->dummy_read_page == NULL)) {
1404                 ret = -ENOMEM;
1405                 goto out_no_drp;
1406         }
1407
1408         INIT_LIST_HEAD(&glob->swap_lru);
1409         INIT_LIST_HEAD(&glob->device_list);
1410
1411         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1412         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1413         if (unlikely(ret != 0)) {
1414                 printk(KERN_ERR TTM_PFX
1415                        "Could not register buffer object swapout.\n");
1416                 goto out_no_shrink;
1417         }
1418
1419         glob->ttm_bo_extra_size =
1420                 ttm_round_pot(sizeof(struct ttm_tt)) +
1421                 ttm_round_pot(sizeof(struct ttm_backend));
1422
1423         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1424                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1425
1426         atomic_set(&glob->bo_count, 0);
1427
1428         ret = kobject_init_and_add(
1429                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1430         if (unlikely(ret != 0))
1431                 kobject_put(&glob->kobj);
1432         return ret;
1433 out_no_shrink:
1434         __free_page(glob->dummy_read_page);
1435 out_no_drp:
1436         kfree(glob);
1437         return ret;
1438 }
1439 EXPORT_SYMBOL(ttm_bo_global_init);
1440
1441
1442 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1443 {
1444         int ret = 0;
1445         unsigned i = TTM_NUM_MEM_TYPES;
1446         struct ttm_mem_type_manager *man;
1447         struct ttm_bo_global *glob = bdev->glob;
1448
1449         while (i--) {
1450                 man = &bdev->man[i];
1451                 if (man->has_type) {
1452                         man->use_type = false;
1453                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1454                                 ret = -EBUSY;
1455                                 printk(KERN_ERR TTM_PFX
1456                                        "DRM memory manager type %d "
1457                                        "is not clean.\n", i);
1458                         }
1459                         man->has_type = false;
1460                 }
1461         }
1462
1463         mutex_lock(&glob->device_list_mutex);
1464         list_del(&bdev->device_list);
1465         mutex_unlock(&glob->device_list_mutex);
1466
1467         if (!cancel_delayed_work(&bdev->wq))
1468                 flush_scheduled_work();
1469
1470         while (ttm_bo_delayed_delete(bdev, true))
1471                 ;
1472
1473         spin_lock(&glob->lru_lock);
1474         if (list_empty(&bdev->ddestroy))
1475                 TTM_DEBUG("Delayed destroy list was clean\n");
1476
1477         if (list_empty(&bdev->man[0].lru))
1478                 TTM_DEBUG("Swap list was clean\n");
1479         spin_unlock(&glob->lru_lock);
1480
1481         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1482         write_lock(&bdev->vm_lock);
1483         drm_mm_takedown(&bdev->addr_space_mm);
1484         write_unlock(&bdev->vm_lock);
1485
1486         return ret;
1487 }
1488 EXPORT_SYMBOL(ttm_bo_device_release);
1489
1490 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1491                        struct ttm_bo_global *glob,
1492                        struct ttm_bo_driver *driver,
1493                        uint64_t file_page_offset,
1494                        bool need_dma32)
1495 {
1496         int ret = -EINVAL;
1497
1498         rwlock_init(&bdev->vm_lock);
1499         bdev->driver = driver;
1500
1501         memset(bdev->man, 0, sizeof(bdev->man));
1502
1503         /*
1504          * Initialize the system memory buffer type.
1505          * Other types need to be driver / IOCTL initialized.
1506          */
1507         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1508         if (unlikely(ret != 0))
1509                 goto out_no_sys;
1510
1511         bdev->addr_space_rb = RB_ROOT;
1512         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1513         if (unlikely(ret != 0))
1514                 goto out_no_addr_mm;
1515
1516         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1517         bdev->nice_mode = true;
1518         INIT_LIST_HEAD(&bdev->ddestroy);
1519         bdev->dev_mapping = NULL;
1520         bdev->glob = glob;
1521         bdev->need_dma32 = need_dma32;
1522
1523         mutex_lock(&glob->device_list_mutex);
1524         list_add_tail(&bdev->device_list, &glob->device_list);
1525         mutex_unlock(&glob->device_list_mutex);
1526
1527         return 0;
1528 out_no_addr_mm:
1529         ttm_bo_clean_mm(bdev, 0);
1530 out_no_sys:
1531         return ret;
1532 }
1533 EXPORT_SYMBOL(ttm_bo_device_init);
1534
1535 /*
1536  * buffer object vm functions.
1537  */
1538
1539 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1540 {
1541         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1542
1543         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1544                 if (mem->mem_type == TTM_PL_SYSTEM)
1545                         return false;
1546
1547                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1548                         return false;
1549
1550                 if (mem->placement & TTM_PL_FLAG_CACHED)
1551                         return false;
1552         }
1553         return true;
1554 }
1555
1556 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1557                       struct ttm_mem_reg *mem,
1558                       unsigned long *bus_base,
1559                       unsigned long *bus_offset, unsigned long *bus_size)
1560 {
1561         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1562
1563         *bus_size = 0;
1564         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1565                 return -EINVAL;
1566
1567         if (ttm_mem_reg_is_pci(bdev, mem)) {
1568                 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1569                 *bus_size = mem->num_pages << PAGE_SHIFT;
1570                 *bus_base = man->io_offset;
1571         }
1572
1573         return 0;
1574 }
1575
1576 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1577 {
1578         struct ttm_bo_device *bdev = bo->bdev;
1579         loff_t offset = (loff_t) bo->addr_space_offset;
1580         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1581
1582         if (!bdev->dev_mapping)
1583                 return;
1584
1585         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1586 }
1587 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1588
1589 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1590 {
1591         struct ttm_bo_device *bdev = bo->bdev;
1592         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1593         struct rb_node *parent = NULL;
1594         struct ttm_buffer_object *cur_bo;
1595         unsigned long offset = bo->vm_node->start;
1596         unsigned long cur_offset;
1597
1598         while (*cur) {
1599                 parent = *cur;
1600                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1601                 cur_offset = cur_bo->vm_node->start;
1602                 if (offset < cur_offset)
1603                         cur = &parent->rb_left;
1604                 else if (offset > cur_offset)
1605                         cur = &parent->rb_right;
1606                 else
1607                         BUG();
1608         }
1609
1610         rb_link_node(&bo->vm_rb, parent, cur);
1611         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1612 }
1613
1614 /**
1615  * ttm_bo_setup_vm:
1616  *
1617  * @bo: the buffer to allocate address space for
1618  *
1619  * Allocate address space in the drm device so that applications
1620  * can mmap the buffer and access the contents. This only
1621  * applies to ttm_bo_type_device objects as others are not
1622  * placed in the drm device address space.
1623  */
1624
1625 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1626 {
1627         struct ttm_bo_device *bdev = bo->bdev;
1628         int ret;
1629
1630 retry_pre_get:
1631         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1632         if (unlikely(ret != 0))
1633                 return ret;
1634
1635         write_lock(&bdev->vm_lock);
1636         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1637                                          bo->mem.num_pages, 0, 0);
1638
1639         if (unlikely(bo->vm_node == NULL)) {
1640                 ret = -ENOMEM;
1641                 goto out_unlock;
1642         }
1643
1644         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1645                                               bo->mem.num_pages, 0);
1646
1647         if (unlikely(bo->vm_node == NULL)) {
1648                 write_unlock(&bdev->vm_lock);
1649                 goto retry_pre_get;
1650         }
1651
1652         ttm_bo_vm_insert_rb(bo);
1653         write_unlock(&bdev->vm_lock);
1654         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1655
1656         return 0;
1657 out_unlock:
1658         write_unlock(&bdev->vm_lock);
1659         return ret;
1660 }
1661
1662 int ttm_bo_wait(struct ttm_buffer_object *bo,
1663                 bool lazy, bool interruptible, bool no_wait)
1664 {
1665         struct ttm_bo_driver *driver = bo->bdev->driver;
1666         void *sync_obj;
1667         void *sync_obj_arg;
1668         int ret = 0;
1669
1670         if (likely(bo->sync_obj == NULL))
1671                 return 0;
1672
1673         while (bo->sync_obj) {
1674
1675                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1676                         void *tmp_obj = bo->sync_obj;
1677                         bo->sync_obj = NULL;
1678                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1679                         spin_unlock(&bo->lock);
1680                         driver->sync_obj_unref(&tmp_obj);
1681                         spin_lock(&bo->lock);
1682                         continue;
1683                 }
1684
1685                 if (no_wait)
1686                         return -EBUSY;
1687
1688                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1689                 sync_obj_arg = bo->sync_obj_arg;
1690                 spin_unlock(&bo->lock);
1691                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1692                                             lazy, interruptible);
1693                 if (unlikely(ret != 0)) {
1694                         driver->sync_obj_unref(&sync_obj);
1695                         spin_lock(&bo->lock);
1696                         return ret;
1697                 }
1698                 spin_lock(&bo->lock);
1699                 if (likely(bo->sync_obj == sync_obj &&
1700                            bo->sync_obj_arg == sync_obj_arg)) {
1701                         void *tmp_obj = bo->sync_obj;
1702                         bo->sync_obj = NULL;
1703                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1704                                   &bo->priv_flags);
1705                         spin_unlock(&bo->lock);
1706                         driver->sync_obj_unref(&sync_obj);
1707                         driver->sync_obj_unref(&tmp_obj);
1708                         spin_lock(&bo->lock);
1709                 } else {
1710                         spin_unlock(&bo->lock);
1711                         driver->sync_obj_unref(&sync_obj);
1712                         spin_lock(&bo->lock);
1713                 }
1714         }
1715         return 0;
1716 }
1717 EXPORT_SYMBOL(ttm_bo_wait);
1718
1719 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1720 {
1721         atomic_set(&bo->reserved, 0);
1722         wake_up_all(&bo->event_queue);
1723 }
1724
1725 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1726                              bool no_wait)
1727 {
1728         int ret;
1729
1730         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1731                 if (no_wait)
1732                         return -EBUSY;
1733                 else if (interruptible) {
1734                         ret = wait_event_interruptible
1735                             (bo->event_queue, atomic_read(&bo->reserved) == 0);
1736                         if (unlikely(ret != 0))
1737                                 return ret;
1738                 } else {
1739                         wait_event(bo->event_queue,
1740                                    atomic_read(&bo->reserved) == 0);
1741                 }
1742         }
1743         return 0;
1744 }
1745
1746 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1747 {
1748         int ret = 0;
1749
1750         /*
1751          * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1752          * makes sure the lru lists are updated.
1753          */
1754
1755         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1756         if (unlikely(ret != 0))
1757                 return ret;
1758         spin_lock(&bo->lock);
1759         ret = ttm_bo_wait(bo, false, true, no_wait);
1760         spin_unlock(&bo->lock);
1761         if (likely(ret == 0))
1762                 atomic_inc(&bo->cpu_writers);
1763         ttm_bo_unreserve(bo);
1764         return ret;
1765 }
1766 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1767
1768 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1769 {
1770         if (atomic_dec_and_test(&bo->cpu_writers))
1771                 wake_up_all(&bo->event_queue);
1772 }
1773 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1774
1775 /**
1776  * A buffer object shrink method that tries to swap out the first
1777  * buffer object on the bo_global::swap_lru list.
1778  */
1779
1780 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1781 {
1782         struct ttm_bo_global *glob =
1783             container_of(shrink, struct ttm_bo_global, shrink);
1784         struct ttm_buffer_object *bo;
1785         int ret = -EBUSY;
1786         int put_count;
1787         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1788
1789         spin_lock(&glob->lru_lock);
1790         while (ret == -EBUSY) {
1791                 if (unlikely(list_empty(&glob->swap_lru))) {
1792                         spin_unlock(&glob->lru_lock);
1793                         return -EBUSY;
1794                 }
1795
1796                 bo = list_first_entry(&glob->swap_lru,
1797                                       struct ttm_buffer_object, swap);
1798                 kref_get(&bo->list_kref);
1799
1800                 /**
1801                  * Reserve buffer. Since we unlock while sleeping, we need
1802                  * to re-check that nobody removed us from the swap-list while
1803                  * we slept.
1804                  */
1805
1806                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1807                 if (unlikely(ret == -EBUSY)) {
1808                         spin_unlock(&glob->lru_lock);
1809                         ttm_bo_wait_unreserved(bo, false);
1810                         kref_put(&bo->list_kref, ttm_bo_release_list);
1811                         spin_lock(&glob->lru_lock);
1812                 }
1813         }
1814
1815         BUG_ON(ret != 0);
1816         put_count = ttm_bo_del_from_lru(bo);
1817         spin_unlock(&glob->lru_lock);
1818
1819         while (put_count--)
1820                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1821
1822         /**
1823          * Wait for GPU, then move to system cached.
1824          */
1825
1826         spin_lock(&bo->lock);
1827         ret = ttm_bo_wait(bo, false, false, false);
1828         spin_unlock(&bo->lock);
1829
1830         if (unlikely(ret != 0))
1831                 goto out;
1832
1833         if ((bo->mem.placement & swap_placement) != swap_placement) {
1834                 struct ttm_mem_reg evict_mem;
1835
1836                 evict_mem = bo->mem;
1837                 evict_mem.mm_node = NULL;
1838                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1839                 evict_mem.mem_type = TTM_PL_SYSTEM;
1840
1841                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1842                                              false, false);
1843                 if (unlikely(ret != 0))
1844                         goto out;
1845         }
1846
1847         ttm_bo_unmap_virtual(bo);
1848
1849         /**
1850          * Swap out. Buffer will be swapped in again as soon as
1851          * anyone tries to access a ttm page.
1852          */
1853
1854         if (bo->bdev->driver->swap_notify)
1855                 bo->bdev->driver->swap_notify(bo);
1856
1857         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1858 out:
1859
1860         /**
1861          *
1862          * Unreserve without putting on LRU to avoid swapping out an
1863          * already swapped buffer.
1864          */
1865
1866         atomic_set(&bo->reserved, 0);
1867         wake_up_all(&bo->event_queue);
1868         kref_put(&bo->list_kref, ttm_bo_release_list);
1869         return ret;
1870 }
1871
1872 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1873 {
1874         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1875                 ;
1876 }
1877 EXPORT_SYMBOL(ttm_bo_swapout_all);