1 /* $OpenBSD: ttm_module.c,v 1.1 2013/08/12 04:11:53 jsg Exp $ */ 2 /************************************************************************** 3 * 4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial portions 17 * of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 25 * USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 **************************************************************************/ 28 /* 29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 30 * Jerome Glisse 31 */ 32 #include <dev/pci/drm/ttm/ttm_module.h> 33 #include <dev/pci/drm/drm_sysfs.h> 34 35 static DECLARE_WAIT_QUEUE_HEAD(exit_q); 36 atomic_t device_released; 37 38 static struct device_type ttm_drm_class_type = { 39 .name = "ttm", 40 /** 41 * Add pm ops here. 42 */ 43 }; 44 45 static void ttm_drm_class_device_release(struct device *dev) 46 { 47 atomic_set(&device_released, 1); 48 wake_up_all(&exit_q); 49 } 50 51 static struct device ttm_drm_class_device = { 52 .type = &ttm_drm_class_type, 53 .release = &ttm_drm_class_device_release 54 }; 55 56 struct kobject *ttm_get_kobj(void) 57 { 58 struct kobject *kobj = &ttm_drm_class_device.kobj; 59 BUG_ON(kobj == NULL); 60 return kobj; 61 } 62 63 static int __init ttm_init(void) 64 { 65 int ret; 66 67 ret = dev_set_name(&ttm_drm_class_device, "ttm"); 68 if (unlikely(ret != 0)) 69 return ret; 70 71 atomic_set(&device_released, 0); 72 ret = drm_class_device_register(&ttm_drm_class_device); 73 if (unlikely(ret != 0)) 74 goto out_no_dev_reg; 75 76 return 0; 77 out_no_dev_reg: 78 atomic_set(&device_released, 1); 79 wake_up_all(&exit_q); 80 return ret; 81 } 82 83 static void __exit ttm_exit(void) 84 { 85 drm_class_device_unregister(&ttm_drm_class_device); 86 87 /** 88 * Refuse to unload until the TTM device is released. 89 * Not sure this is 100% needed. 90 */ 91 92 wait_event(exit_q, atomic_read(&device_released) == 1); 93 } 94 95 module_init(ttm_init); 96 module_exit(ttm_exit); 97 98 MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse"); 99 MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)"); 100 MODULE_LICENSE("GPL and additional rights"); 101