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 struct drm_global_item { 36 struct lock mutex; 37 void *object; 38 int refcount; 39 }; 40 41 static struct drm_global_item glob[DRM_GLOBAL_NUM]; 42 43 void drm_global_init(void) 44 { 45 int i; 46 47 for (i = 0; i < DRM_GLOBAL_NUM; ++i) { 48 struct drm_global_item *item = &glob[i]; 49 lockinit(&item->mutex, "drmgi", 0, LK_CANRECURSE); 50 item->object = NULL; 51 item->refcount = 0; 52 } 53 } 54 55 void drm_global_release(void) 56 { 57 int i; 58 for (i = 0; i < DRM_GLOBAL_NUM; ++i) { 59 struct drm_global_item *item = &glob[i]; 60 KKASSERT(item->object == NULL); 61 KKASSERT(item->refcount == 0); 62 lockuninit(&item->mutex); 63 } 64 } 65 66 int drm_global_item_ref(struct drm_global_reference *ref) 67 { 68 int ret; 69 struct drm_global_item *item = &glob[ref->global_type]; 70 void *object; 71 72 lockmgr(&item->mutex, LK_EXCLUSIVE); 73 if (item->refcount == 0) { 74 item->object = kmalloc(ref->size, M_DRM, 75 M_WAITOK | M_ZERO); 76 77 ref->object = item->object; 78 ret = ref->init(ref); 79 if (unlikely(ret != 0)) 80 goto out_err; 81 82 } 83 ++item->refcount; 84 ref->object = item->object; 85 object = item->object; 86 lockmgr(&item->mutex, LK_RELEASE); 87 return 0; 88 out_err: 89 lockmgr(&item->mutex, LK_RELEASE); 90 item->object = NULL; 91 return ret; 92 } 93 94 void drm_global_item_unref(struct drm_global_reference *ref) 95 { 96 struct drm_global_item *item = &glob[ref->global_type]; 97 98 lockmgr(&item->mutex, LK_EXCLUSIVE); 99 KKASSERT(item->refcount != 0); 100 KKASSERT(ref->object == item->object); 101 if (--item->refcount == 0) { 102 ref->release(ref); 103 drm_free(item->object, M_DRM); 104 item->object = NULL; 105 } 106 lockmgr(&item->mutex, LK_RELEASE); 107 } 108