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 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <dev/drm2/drmP.h> 35 #include <dev/drm2/drm_global.h> 36 37 MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items"); 38 39 struct drm_global_item { 40 struct sx mutex; 41 void *object; 42 int refcount; 43 }; 44 45 static struct drm_global_item glob[DRM_GLOBAL_NUM]; 46 47 void drm_global_init(void) 48 { 49 int i; 50 51 for (i = 0; i < DRM_GLOBAL_NUM; ++i) { 52 struct drm_global_item *item = &glob[i]; 53 sx_init(&item->mutex, "drmgi"); 54 item->object = NULL; 55 item->refcount = 0; 56 } 57 } 58 59 void drm_global_release(void) 60 { 61 int i; 62 for (i = 0; i < DRM_GLOBAL_NUM; ++i) { 63 struct drm_global_item *item = &glob[i]; 64 MPASS(item->object == NULL); 65 MPASS(item->refcount == 0); 66 sx_destroy(&item->mutex); 67 } 68 } 69 70 int drm_global_item_ref(struct drm_global_reference *ref) 71 { 72 int ret; 73 struct drm_global_item *item = &glob[ref->global_type]; 74 75 sx_xlock(&item->mutex); 76 if (item->refcount == 0) { 77 item->object = malloc(ref->size, M_DRM_GLOBAL, 78 M_NOWAIT | M_ZERO); 79 if (unlikely(item->object == NULL)) { 80 ret = -ENOMEM; 81 goto out_err; 82 } 83 84 ref->object = item->object; 85 ret = ref->init(ref); 86 if (unlikely(ret != 0)) 87 goto out_err; 88 89 } 90 ++item->refcount; 91 ref->object = item->object; 92 sx_xunlock(&item->mutex); 93 return 0; 94 out_err: 95 sx_xunlock(&item->mutex); 96 item->object = NULL; 97 return ret; 98 } 99 EXPORT_SYMBOL(drm_global_item_ref); 100 101 void drm_global_item_unref(struct drm_global_reference *ref) 102 { 103 struct drm_global_item *item = &glob[ref->global_type]; 104 105 sx_xlock(&item->mutex); 106 MPASS(item->refcount != 0); 107 MPASS(ref->object == item->object); 108 if (--item->refcount == 0) { 109 ref->release(ref); 110 free(item->object, M_DRM_GLOBAL); 111 item->object = NULL; 112 } 113 sx_xunlock(&item->mutex); 114 } 115 EXPORT_SYMBOL(drm_global_item_unref); 116