drm_hashtab.h 3.1 KB

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  1. /**************************************************************************
  2. *
  3. * Copyright 2006 Tungsten Graphics, Inc., Bismack, 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 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. /*
  29. * Simple open hash tab implementation.
  30. *
  31. * Authors:
  32. * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  33. */
  34. #ifndef DRM_HASHTAB_H
  35. #define DRM_HASHTAB_H
  36. #include <linux/list.h>
  37. #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
  38. struct drm_hash_item {
  39. struct hlist_node head;
  40. unsigned long key;
  41. };
  42. struct drm_open_hash {
  43. struct hlist_head *table;
  44. u8 order;
  45. };
  46. extern int drm_ht_create(struct drm_open_hash *ht, unsigned int order);
  47. extern int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item);
  48. extern int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item,
  49. unsigned long seed, int bits, int shift,
  50. unsigned long add);
  51. extern int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key, struct drm_hash_item **item);
  52. extern void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key);
  53. extern int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key);
  54. extern int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item);
  55. extern void drm_ht_remove(struct drm_open_hash *ht);
  56. /*
  57. * RCU-safe interface
  58. *
  59. * The user of this API needs to make sure that two or more instances of the
  60. * hash table manipulation functions are never run simultaneously.
  61. * The lookup function drm_ht_find_item_rcu may, however, run simultaneously
  62. * with any of the manipulation functions as long as it's called from within
  63. * an RCU read-locked section.
  64. */
  65. #define drm_ht_insert_item_rcu drm_ht_insert_item
  66. #define drm_ht_just_insert_please_rcu drm_ht_just_insert_please
  67. #define drm_ht_remove_key_rcu drm_ht_remove_key
  68. #define drm_ht_remove_item_rcu drm_ht_remove_item
  69. #define drm_ht_find_item_rcu drm_ht_find_item
  70. #endif