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 #include <dev/drm2/drmP.h> 33 #include <dev/drm2/drm_global.h> 34 35 MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items"); 36 37 struct drm_global_item { 38 struct sx 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 sx_init(&item->mutex, "drmgi"); 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 MPASS(item->object == NULL); 63 MPASS(item->refcount == 0); 64 sx_destroy(&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 73 sx_xlock(&item->mutex); 74 if (item->refcount == 0) { 75 item->object = malloc(ref->size, M_DRM_GLOBAL, 76 M_NOWAIT | M_ZERO); 77 if (unlikely(item->object == NULL)) { 78 ret = -ENOMEM; 79 goto out_err; 80 } 81 82 ref->object = item->object; 83 ret = ref->init(ref); 84 if (unlikely(ret != 0)) 85 goto out_err; 86 87 } 88 ++item->refcount; 89 ref->object = item->object; 90 sx_xunlock(&item->mutex); 91 return 0; 92 out_err: 93 sx_xunlock(&item->mutex); 94 item->object = NULL; 95 return ret; 96 } 97 EXPORT_SYMBOL(drm_global_item_ref); 98 99 void drm_global_item_unref(struct drm_global_reference *ref) 100 { 101 struct drm_global_item *item = &glob[ref->global_type]; 102 103 sx_xlock(&item->mutex); 104 MPASS(item->refcount != 0); 105 MPASS(ref->object == item->object); 106 if (--item->refcount == 0) { 107 ref->release(ref); 108 free(item->object, M_DRM_GLOBAL); 109 item->object = NULL; 110 } 111 sx_xunlock(&item->mutex); 112 } 113 EXPORT_SYMBOL(drm_global_item_unref); 114