/drivers/gpu/drm/ttm/ttm_module.c

  1/**************************************************************************
  2 *
  3 * Copyright (c) 2006-2009 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 * 	    Jerome Glisse
 30 */
 31#include <linux/module.h>
 32#include <linux/device.h>
 33#include <linux/sched.h>
 34#include "ttm/ttm_module.h"
 35#include "drm_sysfs.h"
 36
 37static DECLARE_WAIT_QUEUE_HEAD(exit_q);
 38atomic_t device_released;
 39
 40static struct device_type ttm_drm_class_type = {
 41	.name = "ttm",
 42	/**
 43	 * Add pm ops here.
 44	 */
 45};
 46
 47static void ttm_drm_class_device_release(struct device *dev)
 48{
 49	atomic_set(&device_released, 1);
 50	wake_up_all(&exit_q);
 51}
 52
 53static struct device ttm_drm_class_device = {
 54	.type = &ttm_drm_class_type,
 55	.release = &ttm_drm_class_device_release
 56};
 57
 58struct kobject *ttm_get_kobj(void)
 59{
 60	struct kobject *kobj = &ttm_drm_class_device.kobj;
 61	BUG_ON(kobj == NULL);
 62	return kobj;
 63}
 64
 65static int __init ttm_init(void)
 66{
 67	int ret;
 68
 69	ret = dev_set_name(&ttm_drm_class_device, "ttm");
 70	if (unlikely(ret != 0))
 71		return ret;
 72
 73	ttm_global_init();
 74
 75	atomic_set(&device_released, 0);
 76	ret = drm_class_device_register(&ttm_drm_class_device);
 77	if (unlikely(ret != 0))
 78		goto out_no_dev_reg;
 79
 80	return 0;
 81out_no_dev_reg:
 82	atomic_set(&device_released, 1);
 83	wake_up_all(&exit_q);
 84	ttm_global_release();
 85	return ret;
 86}
 87
 88static void __exit ttm_exit(void)
 89{
 90	drm_class_device_unregister(&ttm_drm_class_device);
 91
 92	/**
 93	 * Refuse to unload until the TTM device is released.
 94	 * Not sure this is 100% needed.
 95	 */
 96
 97	wait_event(exit_q, atomic_read(&device_released) == 1);
 98	ttm_global_release();
 99}
100
101module_init(ttm_init);
102module_exit(ttm_exit);
103
104MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
105MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
106MODULE_LICENSE("GPL and additional rights");