release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/gpu/drm/drm_sman.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Bismarck., ND., 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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  *
  27  **************************************************************************/
  28 /*
  29  * Simple memory manager interface that keeps track on allocate regions on a
  30  * per "owner" basis. All regions associated with an "owner" can be released
  31  * with a simple call. Typically if the "owner" exists. The owner is any
  32  * "unsigned long" identifier. Can typically be a pointer to a file private
  33  * struct or a context identifier.
  34  *
  35  * Authors:
  36  * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  37  */
  38
  39 #include "drm_sman.h"
  40
  41 struct drm_owner_item {
  42         struct drm_hash_item owner_hash;
  43         struct list_head sman_list;
  44         struct list_head mem_blocks;
  45 };
  46
  47 void drm_sman_takedown(struct drm_sman * sman)
  48 {
  49         drm_ht_remove(&sman->user_hash_tab);
  50         drm_ht_remove(&sman->owner_hash_tab);
  51         kfree(sman->mm);
  52 }
  53
  54 EXPORT_SYMBOL(drm_sman_takedown);
  55
  56 int
  57 drm_sman_init(struct drm_sman * sman, unsigned int num_managers,
  58               unsigned int user_order, unsigned int owner_order)
  59 {
  60         int ret = 0;
  61
  62         sman->mm = (struct drm_sman_mm *) kcalloc(num_managers,
  63                                                   sizeof(*sman->mm),
  64                                                   GFP_KERNEL);
  65         if (!sman->mm) {
  66                 ret = -ENOMEM;
  67                 goto out;
  68         }
  69         sman->num_managers = num_managers;
  70         INIT_LIST_HEAD(&sman->owner_items);
  71         ret = drm_ht_create(&sman->owner_hash_tab, owner_order);
  72         if (ret)
  73                 goto out1;
  74         ret = drm_ht_create(&sman->user_hash_tab, user_order);
  75         if (!ret)
  76                 goto out;
  77
  78         drm_ht_remove(&sman->owner_hash_tab);
  79 out1:
  80         kfree(sman->mm);
  81 out:
  82         return ret;
  83 }
  84
  85 EXPORT_SYMBOL(drm_sman_init);
  86
  87 static void *drm_sman_mm_allocate(void *private, unsigned long size,
  88                                   unsigned alignment)
  89 {
  90         struct drm_mm *mm = (struct drm_mm *) private;
  91         struct drm_mm_node *tmp;
  92
  93         tmp = drm_mm_search_free(mm, size, alignment, 1);
  94         if (!tmp) {
  95                 return NULL;
  96         }
  97         tmp = drm_mm_get_block(tmp, size, alignment);
  98         return tmp;
  99 }
 100
 101 static void drm_sman_mm_free(void *private, void *ref)
 102 {
 103         struct drm_mm_node *node = (struct drm_mm_node *) ref;
 104
 105         drm_mm_put_block(node);
 106 }
 107
 108 static void drm_sman_mm_destroy(void *private)
 109 {
 110         struct drm_mm *mm = (struct drm_mm *) private;
 111         drm_mm_takedown(mm);
 112         kfree(mm);
 113 }
 114
 115 static unsigned long drm_sman_mm_offset(void *private, void *ref)
 116 {
 117         struct drm_mm_node *node = (struct drm_mm_node *) ref;
 118         return node->start;
 119 }
 120
 121 int
 122 drm_sman_set_range(struct drm_sman * sman, unsigned int manager,
 123                    unsigned long start, unsigned long size)
 124 {
 125         struct drm_sman_mm *sman_mm;
 126         struct drm_mm *mm;
 127         int ret;
 128
 129         BUG_ON(manager >= sman->num_managers);
 130
 131         sman_mm = &sman->mm[manager];
 132         mm = kzalloc(sizeof(*mm), GFP_KERNEL);
 133         if (!mm) {
 134                 return -ENOMEM;
 135         }
 136         sman_mm->private = mm;
 137         ret = drm_mm_init(mm, start, size);
 138
 139         if (ret) {
 140                 kfree(mm);
 141                 return ret;
 142         }
 143
 144         sman_mm->allocate = drm_sman_mm_allocate;
 145         sman_mm->free = drm_sman_mm_free;
 146         sman_mm->destroy = drm_sman_mm_destroy;
 147         sman_mm->offset = drm_sman_mm_offset;
 148
 149         return 0;
 150 }
 151
 152 EXPORT_SYMBOL(drm_sman_set_range);
 153
 154 int
 155 drm_sman_set_manager(struct drm_sman * sman, unsigned int manager,
 156                      struct drm_sman_mm * allocator)
 157 {
 158         BUG_ON(manager >= sman->num_managers);
 159         sman->mm[manager] = *allocator;
 160
 161         return 0;
 162 }
 163 EXPORT_SYMBOL(drm_sman_set_manager);
 164
 165 static struct drm_owner_item *drm_sman_get_owner_item(struct drm_sman * sman,
 166                                                  unsigned long owner)
 167 {
 168         int ret;
 169         struct drm_hash_item *owner_hash_item;
 170         struct drm_owner_item *owner_item;
 171
 172         ret = drm_ht_find_item(&sman->owner_hash_tab, owner, &owner_hash_item);
 173         if (!ret) {
 174                 return drm_hash_entry(owner_hash_item, struct drm_owner_item,
 175                                       owner_hash);
 176         }
 177
 178         owner_item = kzalloc(sizeof(*owner_item), GFP_KERNEL);
 179         if (!owner_item)
 180                 goto out;
 181
 182         INIT_LIST_HEAD(&owner_item->mem_blocks);
 183         owner_item->owner_hash.key = owner;
 184         if (drm_ht_insert_item(&sman->owner_hash_tab, &owner_item->owner_hash))
 185                 goto out1;
 186
 187         list_add_tail(&owner_item->sman_list, &sman->owner_items);
 188         return owner_item;
 189
 190 out1:
 191         kfree(owner_item);
 192 out:
 193         return NULL;
 194 }
 195
 196 struct drm_memblock_item *drm_sman_alloc(struct drm_sman *sman, unsigned int manager,
 197                                     unsigned long size, unsigned alignment,
 198                                     unsigned long owner)
 199 {
 200         void *tmp;
 201         struct drm_sman_mm *sman_mm;
 202         struct drm_owner_item *owner_item;
 203         struct drm_memblock_item *memblock;
 204
 205         BUG_ON(manager >= sman->num_managers);
 206
 207         sman_mm = &sman->mm[manager];
 208         tmp = sman_mm->allocate(sman_mm->private, size, alignment);
 209
 210         if (!tmp) {
 211                 return NULL;
 212         }
 213
 214         memblock = kzalloc(sizeof(*memblock), GFP_KERNEL);
 215
 216         if (!memblock)
 217                 goto out;
 218
 219         memblock->mm_info = tmp;
 220         memblock->mm = sman_mm;
 221         memblock->sman = sman;
 222
 223         if (drm_ht_just_insert_please
 224             (&sman->user_hash_tab, &memblock->user_hash,
 225              (unsigned long)memblock, 32, 0, 0))
 226                 goto out1;
 227
 228         owner_item = drm_sman_get_owner_item(sman, owner);
 229         if (!owner_item)
 230                 goto out2;
 231
 232         list_add_tail(&memblock->owner_list, &owner_item->mem_blocks);
 233
 234         return memblock;
 235
 236 out2:
 237         drm_ht_remove_item(&sman->user_hash_tab, &memblock->user_hash);
 238 out1:
 239         kfree(memblock);
 240 out:
 241         sman_mm->free(sman_mm->private, tmp);
 242
 243         return NULL;
 244 }
 245
 246 EXPORT_SYMBOL(drm_sman_alloc);
 247
 248 static void drm_sman_free(struct drm_memblock_item *item)
 249 {
 250         struct drm_sman *sman = item->sman;
 251
 252         list_del(&item->owner_list);
 253         drm_ht_remove_item(&sman->user_hash_tab, &item->user_hash);
 254         item->mm->free(item->mm->private, item->mm_info);
 255         kfree(item);
 256 }
 257
 258 int drm_sman_free_key(struct drm_sman *sman, unsigned int key)
 259 {
 260         struct drm_hash_item *hash_item;
 261         struct drm_memblock_item *memblock_item;
 262
 263         if (drm_ht_find_item(&sman->user_hash_tab, key, &hash_item))
 264                 return -EINVAL;
 265
 266         memblock_item = drm_hash_entry(hash_item, struct drm_memblock_item,
 267                                        user_hash);
 268         drm_sman_free(memblock_item);
 269         return 0;
 270 }
 271
 272 EXPORT_SYMBOL(drm_sman_free_key);
 273
 274 static void drm_sman_remove_owner(struct drm_sman *sman,
 275                                   struct drm_owner_item *owner_item)
 276 {
 277         list_del(&owner_item->sman_list);
 278         drm_ht_remove_item(&sman->owner_hash_tab, &owner_item->owner_hash);
 279         kfree(owner_item);
 280 }
 281
 282 int drm_sman_owner_clean(struct drm_sman *sman, unsigned long owner)
 283 {
 284
 285         struct drm_hash_item *hash_item;
 286         struct drm_owner_item *owner_item;
 287
 288         if (drm_ht_find_item(&sman->owner_hash_tab, owner, &hash_item)) {
 289                 return -1;
 290         }
 291
 292         owner_item = drm_hash_entry(hash_item, struct drm_owner_item, owner_hash);
 293         if (owner_item->mem_blocks.next == &owner_item->mem_blocks) {
 294                 drm_sman_remove_owner(sman, owner_item);
 295                 return -1;
 296         }
 297
 298         return 0;
 299 }
 300
 301 EXPORT_SYMBOL(drm_sman_owner_clean);
 302
 303 static void drm_sman_do_owner_cleanup(struct drm_sman *sman,
 304                                       struct drm_owner_item *owner_item)
 305 {
 306         struct drm_memblock_item *entry, *next;
 307
 308         list_for_each_entry_safe(entry, next, &owner_item->mem_blocks,
 309                                  owner_list) {
 310                 drm_sman_free(entry);
 311         }
 312         drm_sman_remove_owner(sman, owner_item);
 313 }
 314
 315 void drm_sman_owner_cleanup(struct drm_sman *sman, unsigned long owner)
 316 {
 317
 318         struct drm_hash_item *hash_item;
 319         struct drm_owner_item *owner_item;
 320
 321         if (drm_ht_find_item(&sman->owner_hash_tab, owner, &hash_item)) {
 322
 323                 return;
 324         }
 325
 326         owner_item = drm_hash_entry(hash_item, struct drm_owner_item, owner_hash);
 327         drm_sman_do_owner_cleanup(sman, owner_item);
 328 }
 329
 330 EXPORT_SYMBOL(drm_sman_owner_cleanup);
 331
 332 void drm_sman_cleanup(struct drm_sman *sman)
 333 {
 334         struct drm_owner_item *entry, *next;
 335         unsigned int i;
 336         struct drm_sman_mm *sman_mm;
 337
 338         list_for_each_entry_safe(entry, next, &sman->owner_items, sman_list) {
 339                 drm_sman_do_owner_cleanup(sman, entry);
 340         }
 341         if (sman->mm) {
 342                 for (i = 0; i < sman->num_managers; ++i) {
 343                         sman_mm = &sman->mm[i];
 344                         if (sman_mm->private) {
 345                                 sman_mm->destroy(sman_mm->private);
 346                                 sman_mm->private = NULL;
 347                         }
 348                 }
 349         }
 350 }
 351
 352 EXPORT_SYMBOL(drm_sman_cleanup);