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path: root/drivers/gpu/drm/ttm/ttm_module.c
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Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_module.c')
-rw-r--r--drivers/gpu/drm/ttm/ttm_module.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_module.c b/drivers/gpu/drm/ttm/ttm_module.c
new file mode 100644
index 000000000..66fc6395e
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_module.c
@@ -0,0 +1,102 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ * Jerome Glisse
+ */
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/sched.h>
+#include <drm/ttm/ttm_module.h>
+#include <drm/drm_sysfs.h>
+
+static DECLARE_WAIT_QUEUE_HEAD(exit_q);
+static atomic_t device_released;
+
+static struct device_type ttm_drm_class_type = {
+ .name = "ttm",
+ /**
+ * Add pm ops here.
+ */
+};
+
+static void ttm_drm_class_device_release(struct device *dev)
+{
+ atomic_set(&device_released, 1);
+ wake_up_all(&exit_q);
+}
+
+static struct device ttm_drm_class_device = {
+ .type = &ttm_drm_class_type,
+ .release = &ttm_drm_class_device_release
+};
+
+struct kobject *ttm_get_kobj(void)
+{
+ struct kobject *kobj = &ttm_drm_class_device.kobj;
+ BUG_ON(kobj == NULL);
+ return kobj;
+}
+
+static int __init ttm_init(void)
+{
+ int ret;
+
+ ret = dev_set_name(&ttm_drm_class_device, "ttm");
+ if (unlikely(ret != 0))
+ return ret;
+
+ atomic_set(&device_released, 0);
+ ret = drm_class_device_register(&ttm_drm_class_device);
+ if (unlikely(ret != 0))
+ goto out_no_dev_reg;
+
+ return 0;
+out_no_dev_reg:
+ atomic_set(&device_released, 1);
+ wake_up_all(&exit_q);
+ return ret;
+}
+
+static void __exit ttm_exit(void)
+{
+ drm_class_device_unregister(&ttm_drm_class_device);
+
+ /**
+ * Refuse to unload until the TTM device is released.
+ * Not sure this is 100% needed.
+ */
+
+ wait_event(exit_q, atomic_read(&device_released) == 1);
+}
+
+module_init(ttm_init);
+module_exit(ttm_exit);
+
+MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
+MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
+MODULE_LICENSE("GPL and additional rights");