1 /************************************************************************** 2 * 3 * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., 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 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 * $FreeBSD: head/sys/dev/drm2/drm_global.c 248060 2013-03-08 18:11:02Z dumbbell $ 30 */ 31 32 #include <drm/drmP.h> 33 #include <drm/drm_global.h> 34 35 MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items"); 36 37 struct drm_global_item { 38 struct lock mutex; 39 void *object; 40 int refcount; 41 }; 42 43 static struct drm_global_item glob[DRM_GLOBAL_NUM]; 44 45 void drm_global_init(void) 46 { 47 int i; 48 49 for (i = 0; i < DRM_GLOBAL_NUM; ++i) { 50 struct drm_global_item *item = &glob[i]; 51 lockinit(&item->mutex, "drmgi", 0, LK_CANRECURSE); 52 item->object = NULL; 53 item->refcount = 0; 54 } 55 } 56 57 void drm_global_release(void) 58 { 59 int i; 60 for (i = 0; i < DRM_GLOBAL_NUM; ++i) { 61 struct drm_global_item *item = &glob[i]; 62 KKASSERT(item->object == NULL); 63 KKASSERT(item->refcount == 0); 64 lockuninit(&item->mutex); 65 } 66 } 67 68 int drm_global_item_ref(struct drm_global_reference *ref) 69 { 70 int ret; 71 struct drm_global_item *item = &glob[ref->global_type]; 72 void *object; 73 74 lockmgr(&item->mutex, LK_EXCLUSIVE); 75 if (item->refcount == 0) { 76 item->object = kmalloc(ref->size, M_DRM_GLOBAL, 77 M_WAITOK | M_ZERO); 78 79 ref->object = item->object; 80 ret = ref->init(ref); 81 if (unlikely(ret != 0)) 82 goto out_err; 83 84 } 85 ++item->refcount; 86 ref->object = item->object; 87 object = item->object; 88 lockmgr(&item->mutex, LK_RELEASE); 89 return 0; 90 out_err: 91 lockmgr(&item->mutex, LK_RELEASE); 92 item->object = NULL; 93 return ret; 94 } 95 96 void drm_global_item_unref(struct drm_global_reference *ref) 97 { 98 struct drm_global_item *item = &glob[ref->global_type]; 99 100 lockmgr(&item->mutex, LK_EXCLUSIVE); 101 KKASSERT(item->refcount != 0); 102 KKASSERT(ref->object == item->object); 103 if (--item->refcount == 0) { 104 ref->release(ref); 105 drm_free(item->object, M_DRM_GLOBAL); 106 item->object = NULL; 107 } 108 lockmgr(&item->mutex, LK_RELEASE); 109 } 110