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  1. /*
  2.  * Header file for reservations for dma-buf and ttm
  3.  *
  4.  * Copyright(C) 2011 Linaro Limited. All rights reserved.
  5.  * Copyright (C) 2012-2013 Canonical Ltd
  6.  * Copyright (C) 2012 Texas Instruments
  7.  *
  8.  * Authors:
  9.  * Rob Clark <robdclark@gmail.com>
  10.  * Maarten Lankhorst <maarten.lankhorst@canonical.com>
  11.  * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  12.  *
  13.  * Based on bo.c which bears the following copyright notice,
  14.  * but is dual licensed:
  15.  *
  16.  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
  17.  * All Rights Reserved.
  18.  *
  19.  * Permission is hereby granted, free of charge, to any person obtaining a
  20.  * copy of this software and associated documentation files (the
  21.  * "Software"), to deal in the Software without restriction, including
  22.  * without limitation the rights to use, copy, modify, merge, publish,
  23.  * distribute, sub license, and/or sell copies of the Software, and to
  24.  * permit persons to whom the Software is furnished to do so, subject to
  25.  * the following conditions:
  26.  *
  27.  * The above copyright notice and this permission notice (including the
  28.  * next paragraph) shall be included in all copies or substantial portions
  29.  * of the Software.
  30.  *
  31.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  32.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  33.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  34.  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  35.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  36.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  37.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  38.  */
  39. #ifndef _LINUX_RESERVATION_H
  40. #define _LINUX_RESERVATION_H
  41.  
  42. #include <linux/ww_mutex.h>
  43. #include <linux/fence.h>
  44. #include <linux/slab.h>
  45. #include <linux/seqlock.h>
  46. #include <linux/rcupdate.h>
  47.  
  48. extern struct ww_class reservation_ww_class;
  49. extern struct lock_class_key reservation_seqcount_class;
  50. extern const char reservation_seqcount_string[];
  51.  
  52. struct reservation_object_list {
  53.         struct rcu_head rcu;
  54.         u32 shared_count, shared_max;
  55.         struct fence __rcu *shared[];
  56. };
  57.  
  58. struct reservation_object {
  59.         struct ww_mutex lock;
  60.         seqcount_t seq;
  61.  
  62.         struct fence __rcu *fence_excl;
  63.         struct reservation_object_list __rcu *fence;
  64.         struct reservation_object_list *staged;
  65. };
  66.  
  67. #define reservation_object_held(obj) lockdep_is_held(&(obj)->lock.base)
  68. #define reservation_object_assert_held(obj) \
  69.         lockdep_assert_held(&(obj)->lock.base)
  70.  
  71. static inline void
  72. reservation_object_init(struct reservation_object *obj)
  73. {
  74.         ww_mutex_init(&obj->lock, &reservation_ww_class);
  75.  
  76.         __seqcount_init(&obj->seq, reservation_seqcount_string, &reservation_seqcount_class);
  77.         RCU_INIT_POINTER(obj->fence, NULL);
  78.         RCU_INIT_POINTER(obj->fence_excl, NULL);
  79.         obj->staged = NULL;
  80. }
  81.  
  82. static inline void
  83. reservation_object_fini(struct reservation_object *obj)
  84. {
  85.         int i;
  86.         struct reservation_object_list *fobj;
  87.         struct fence *excl;
  88.  
  89.         /*
  90.          * This object should be dead and all references must have
  91.          * been released to it, so no need to be protected with rcu.
  92.          */
  93.         excl = rcu_dereference_protected(obj->fence_excl, 1);
  94.         if (excl)
  95.                 fence_put(excl);
  96.  
  97.         fobj = rcu_dereference_protected(obj->fence, 1);
  98.         if (fobj) {
  99.                 for (i = 0; i < fobj->shared_count; ++i)
  100.                         fence_put(rcu_dereference_protected(fobj->shared[i], 1));
  101.  
  102.                 kfree(fobj);
  103.         }
  104.         kfree(obj->staged);
  105.  
  106.         ww_mutex_destroy(&obj->lock);
  107. }
  108.  
  109. static inline struct reservation_object_list *
  110. reservation_object_get_list(struct reservation_object *obj)
  111. {
  112.         return rcu_dereference_protected(obj->fence,
  113.                                          reservation_object_held(obj));
  114. }
  115.  
  116. static inline struct fence *
  117. reservation_object_get_excl(struct reservation_object *obj)
  118. {
  119.         return rcu_dereference_protected(obj->fence_excl,
  120.                                          reservation_object_held(obj));
  121. }
  122.  
  123. int reservation_object_reserve_shared(struct reservation_object *obj);
  124. void reservation_object_add_shared_fence(struct reservation_object *obj,
  125.                                          struct fence *fence);
  126.  
  127. void reservation_object_add_excl_fence(struct reservation_object *obj,
  128.                                        struct fence *fence);
  129.  
  130. int reservation_object_get_fences_rcu(struct reservation_object *obj,
  131.                                       struct fence **pfence_excl,
  132.                                       unsigned *pshared_count,
  133.                                       struct fence ***pshared);
  134.  
  135. long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
  136.                                          bool wait_all, bool intr,
  137.                                          unsigned long timeout);
  138.  
  139. bool reservation_object_test_signaled_rcu(struct reservation_object *obj,
  140.                                           bool test_all);
  141.  
  142. #endif /* _LINUX_RESERVATION_H */
  143.