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1408 | serge | 1 | /************************************************************************** |
2 | * |
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3 | * Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. USA. |
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4 | * All Rights Reserved. |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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7 | * copy of this software and associated documentation files (the |
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8 | * "Software"), to deal in the Software without restriction, including |
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9 | * without limitation the rights to use, copy, modify, merge, publish, |
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10 | * distribute, sub license, and/or sell copies of the Software, and to |
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11 | * permit persons to whom the Software is furnished to do so, subject to |
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12 | * the following conditions: |
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13 | * |
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14 | * The above copyright notice and this permission notice (including the |
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15 | * next paragraph) shall be included in all copies or substantial portions |
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16 | * of the Software. |
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17 | * |
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18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
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21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
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22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
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24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
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25 | * |
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26 | * |
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27 | **************************************************************************/ |
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28 | /* |
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29 | * Simple open hash tab implementation. |
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30 | * |
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31 | * Authors: |
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32 | * Thomas Hellström |
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33 | */ |
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34 | |||
35 | #ifndef DRM_HASHTAB_H |
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36 | #define DRM_HASHTAB_H |
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37 | |||
38 | #include |
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39 | |||
40 | #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member) |
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41 | |||
42 | struct drm_hash_item { |
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43 | struct hlist_node head; |
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44 | unsigned long key; |
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45 | }; |
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46 | |||
47 | struct drm_open_hash { |
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48 | struct hlist_head *table; |
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1964 | serge | 49 | u8 order; |
1408 | serge | 50 | }; |
51 | |||
52 | extern int drm_ht_create(struct drm_open_hash *ht, unsigned int order); |
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53 | extern int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item); |
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54 | extern int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item, |
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55 | unsigned long seed, int bits, int shift, |
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56 | unsigned long add); |
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57 | extern int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key, struct drm_hash_item **item); |
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58 | |||
59 | extern void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key); |
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60 | extern int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key); |
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61 | extern int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item); |
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62 | extern void drm_ht_remove(struct drm_open_hash *ht); |
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63 | |||
3192 | Serge | 64 | /* |
65 | * RCU-safe interface |
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66 | * |
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67 | * The user of this API needs to make sure that two or more instances of the |
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68 | * hash table manipulation functions are never run simultaneously. |
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69 | * The lookup function drm_ht_find_item_rcu may, however, run simultaneously |
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70 | * with any of the manipulation functions as long as it's called from within |
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71 | * an RCU read-locked section. |
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72 | */ |
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73 | #define drm_ht_insert_item_rcu drm_ht_insert_item |
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74 | #define drm_ht_just_insert_please_rcu drm_ht_just_insert_please |
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75 | #define drm_ht_remove_key_rcu drm_ht_remove_key |
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76 | #define drm_ht_remove_item_rcu drm_ht_remove_item |
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77 | #define drm_ht_find_item_rcu drm_ht_find_item |
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1408 | serge | 78 | |
79 | #endif |