git.oblomov.eu Git - linux-2.6/blob - drivers/char/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         if (sman->mm)
  52                 drm_free(sman->mm, sman->num_managers * sizeof(*sman->mm),
  53                          DRM_MEM_MM);
  54 }
  55
  56 EXPORT_SYMBOL(drm_sman_takedown);
  57
  58 int
  59 drm_sman_init(struct drm_sman * sman, unsigned int num_managers,
  60               unsigned int user_order, unsigned int owner_order)
  61 {
  62         int ret = 0;
  63
  64         sman->mm = (struct drm_sman_mm *) drm_calloc(num_managers, sizeof(*sman->mm),
  65                                                 DRM_MEM_MM);
  66         if (!sman->mm) {
  67                 ret = -ENOMEM;
  68                 goto out;
  69         }
  70         sman->num_managers = num_managers;
  71         INIT_LIST_HEAD(&sman->owner_items);
  72         ret = drm_ht_create(&sman->owner_hash_tab, owner_order);
  73         if (ret)
  74                 goto out1;
  75         ret = drm_ht_create(&sman->user_hash_tab, user_order);
  76         if (!ret)
  77                 goto out;
  78
  79         drm_ht_remove(&sman->owner_hash_tab);
  80 out1:
  81         drm_free(sman->mm, num_managers * sizeof(*sman->mm), DRM_MEM_MM);
  82 out:
  83         return ret;
  84 }
  85
  86 EXPORT_SYMBOL(drm_sman_init);
  87
  88 static void *drm_sman_mm_allocate(void *private, unsigned long size,
  89                                   unsigned alignment)
  90 {
  91         struct drm_mm *mm = (struct drm_mm *) private;
  92         struct drm_mm_node *tmp;
  93
  94         tmp = drm_mm_search_free(mm, size, alignment, 1);
  95         if (!tmp) {
  96                 return NULL;
  97         }
  98         tmp = drm_mm_get_block(tmp, size, alignment);
  99         return tmp;
 100 }
 101
 102 static void drm_sman_mm_free(void *private, void *ref)
 103 {
 104         struct drm_mm_node *node = (struct drm_mm_node *) ref;
 105
 106         drm_mm_put_block(node);
 107 }
 108
 109 static void drm_sman_mm_destroy(void *private)
 110 {
 111         struct drm_mm *mm = (struct drm_mm *) private;
 112         drm_mm_takedown(mm);
 113         drm_free(mm, sizeof(*mm), DRM_MEM_MM);
 114 }
 115
 116 static unsigned long drm_sman_mm_offset(void *private, void *ref)
 117 {
 118         struct drm_mm_node *node = (struct drm_mm_node *) ref;
 119         return node->start;
 120 }
 121
 122 int
 123 drm_sman_set_range(struct drm_sman * sman, unsigned int manager,
 124                    unsigned long start, unsigned long size)
 125 {
 126         struct drm_sman_mm *sman_mm;
 127         struct drm_mm *mm;
 128         int ret;
 129
 130         BUG_ON(manager >= sman->num_managers);
 131
 132         sman_mm = &sman->mm[manager];
 133         mm = drm_calloc(1, sizeof(*mm), DRM_MEM_MM);
 134         if (!mm) {
 135                 return -ENOMEM;
 136         }
 137         sman_mm->private = mm;
 138         ret = drm_mm_init(mm, start, size);
 139
 140         if (ret) {
 141                 drm_free(mm, sizeof(*mm), DRM_MEM_MM);
 142                 return ret;
 143         }
 144
 145         sman_mm->allocate = drm_sman_mm_allocate;
 146         sman_mm->free = drm_sman_mm_free;
 147         sman_mm->destroy = drm_sman_mm_destroy;
 148         sman_mm->offset = drm_sman_mm_offset;
 149
 150         return 0;
 151 }
 152
 153 EXPORT_SYMBOL(drm_sman_set_range);
 154
 155 int
 156 drm_sman_set_manager(struct drm_sman * sman, unsigned int manager,
 157                      struct drm_sman_mm * allocator)
 158 {
 159         BUG_ON(manager >= sman->num_managers);
 160         sman->mm[manager] = *allocator;
 161
 162         return 0;
 163 }
 164 EXPORT_SYMBOL(drm_sman_set_manager);
 165
 166 static struct drm_owner_item *drm_sman_get_owner_item(struct drm_sman * sman,
 167                                                  unsigned long owner)
 168 {
 169         int ret;
 170         struct drm_hash_item *owner_hash_item;
 171         struct drm_owner_item *owner_item;
 172
 173         ret = drm_ht_find_item(&sman->owner_hash_tab, owner, &owner_hash_item);
 174         if (!ret) {
 175                 return drm_hash_entry(owner_hash_item, struct drm_owner_item,
 176                                       owner_hash);
 177         }
 178
 179         owner_item = drm_calloc(1, sizeof(*owner_item), DRM_MEM_MM);
 180         if (!owner_item)
 181                 goto out;
 182
 183         INIT_LIST_HEAD(&owner_item->mem_blocks);
 184         owner_item->owner_hash.key = owner;
 185         if (drm_ht_insert_item(&sman->owner_hash_tab, &owner_item->owner_hash))
 186                 goto out1;
 187
 188         list_add_tail(&owner_item->sman_list, &sman->owner_items);
 189         return owner_item;
 190
 191 out1:
 192         drm_free(owner_item, sizeof(*owner_item), DRM_MEM_MM);
 193 out:
 194         return NULL;
 195 }
 196
 197 struct drm_memblock_item *drm_sman_alloc(struct drm_sman *sman, unsigned int manager,
 198                                     unsigned long size, unsigned alignment,
 199                                     unsigned long owner)
 200 {
 201         void *tmp;
 202         struct drm_sman_mm *sman_mm;
 203         struct drm_owner_item *owner_item;
 204         struct drm_memblock_item *memblock;
 205
 206         BUG_ON(manager >= sman->num_managers);
 207
 208         sman_mm = &sman->mm[manager];
 209         tmp = sman_mm->allocate(sman_mm->private, size, alignment);
 210
 211         if (!tmp) {
 212                 return NULL;
 213         }
 214
 215         memblock = drm_calloc(1, sizeof(*memblock), DRM_MEM_MM);
 216
 217         if (!memblock)
 218                 goto out;
 219
 220         memblock->mm_info = tmp;
 221         memblock->mm = sman_mm;
 222         memblock->sman = sman;
 223
 224         if (drm_ht_just_insert_please
 225             (&sman->user_hash_tab, &memblock->user_hash,
 226              (unsigned long)memblock, 32, 0, 0))
 227                 goto out1;
 228
 229         owner_item = drm_sman_get_owner_item(sman, owner);
 230         if (!owner_item)
 231                 goto out2;
 232
 233         list_add_tail(&memblock->owner_list, &owner_item->mem_blocks);
 234
 235         return memblock;
 236
 237 out2:
 238         drm_ht_remove_item(&sman->user_hash_tab, &memblock->user_hash);
 239 out1:
 240         drm_free(memblock, sizeof(*memblock), DRM_MEM_MM);
 241 out:
 242         sman_mm->free(sman_mm->private, tmp);
 243
 244         return NULL;
 245 }
 246
 247 EXPORT_SYMBOL(drm_sman_alloc);
 248
 249 static void drm_sman_free(struct drm_memblock_item *item)
 250 {
 251         struct drm_sman *sman = item->sman;
 252
 253         list_del(&item->owner_list);
 254         drm_ht_remove_item(&sman->user_hash_tab, &item->user_hash);
 255         item->mm->free(item->mm->private, item->mm_info);
 256         drm_free(item, sizeof(*item), DRM_MEM_MM);
 257 }
 258
 259 int drm_sman_free_key(struct drm_sman *sman, unsigned int key)
 260 {
 261         struct drm_hash_item *hash_item;
 262         struct drm_memblock_item *memblock_item;
 263
 264         if (drm_ht_find_item(&sman->user_hash_tab, key, &hash_item))
 265                 return -EINVAL;
 266
 267         memblock_item = drm_hash_entry(hash_item, struct drm_memblock_item,
 268                                        user_hash);
 269         drm_sman_free(memblock_item);
 270         return 0;
 271 }
 272
 273 EXPORT_SYMBOL(drm_sman_free_key);
 274
 275 static void drm_sman_remove_owner(struct drm_sman *sman,
 276                                   struct drm_owner_item *owner_item)
 277 {
 278         list_del(&owner_item->sman_list);
 279         drm_ht_remove_item(&sman->owner_hash_tab, &owner_item->owner_hash);
 280         drm_free(owner_item, sizeof(*owner_item), DRM_MEM_MM);
 281 }
 282
 283 int drm_sman_owner_clean(struct drm_sman *sman, unsigned long owner)
 284 {
 285
 286         struct drm_hash_item *hash_item;
 287         struct drm_owner_item *owner_item;
 288
 289         if (drm_ht_find_item(&sman->owner_hash_tab, owner, &hash_item)) {
 290                 return -1;
 291         }
 292
 293         owner_item = drm_hash_entry(hash_item, struct drm_owner_item, owner_hash);
 294         if (owner_item->mem_blocks.next == &owner_item->mem_blocks) {
 295                 drm_sman_remove_owner(sman, owner_item);
 296                 return -1;
 297         }
 298
 299         return 0;
 300 }
 301
 302 EXPORT_SYMBOL(drm_sman_owner_clean);
 303
 304 static void drm_sman_do_owner_cleanup(struct drm_sman *sman,
 305                                       struct drm_owner_item *owner_item)
 306 {
 307         struct drm_memblock_item *entry, *next;
 308
 309         list_for_each_entry_safe(entry, next, &owner_item->mem_blocks,
 310                                  owner_list) {
 311                 drm_sman_free(entry);
 312         }
 313         drm_sman_remove_owner(sman, owner_item);
 314 }
 315
 316 void drm_sman_owner_cleanup(struct drm_sman *sman, unsigned long owner)
 317 {
 318
 319         struct drm_hash_item *hash_item;
 320         struct drm_owner_item *owner_item;
 321
 322         if (drm_ht_find_item(&sman->owner_hash_tab, owner, &hash_item)) {
 323
 324                 return;
 325         }
 326
 327         owner_item = drm_hash_entry(hash_item, struct drm_owner_item, owner_hash);
 328         drm_sman_do_owner_cleanup(sman, owner_item);
 329 }
 330
 331 EXPORT_SYMBOL(drm_sman_owner_cleanup);
 332
 333 void drm_sman_cleanup(struct drm_sman *sman)
 334 {
 335         struct drm_owner_item *entry, *next;
 336         unsigned int i;
 337         struct drm_sman_mm *sman_mm;
 338
 339         list_for_each_entry_safe(entry, next, &sman->owner_items, sman_list) {
 340                 drm_sman_do_owner_cleanup(sman, entry);
 341         }
 342         if (sman->mm) {
 343                 for (i = 0; i < sman->num_managers; ++i) {
 344                         sman_mm = &sman->mm[i];
 345                         if (sman_mm->private) {
 346                                 sman_mm->destroy(sman_mm->private);
 347                                 sman_mm->private = NULL;
 348                         }
 349                 }
 350         }
 351 }
 352
 353 EXPORT_SYMBOL(drm_sman_cleanup);