Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / nouveau / nvkm / core / notify.c

diff --git a/kernel/drivers/gpu/drm/nouveau/nvkm/core/notify.c b/kernel/drivers/gpu/drm/nouveau/nvkm/core/notify.c
new file mode 100644 (file)
index 0000000..023610d
--- /dev/null
+++ b/kernel/drivers/gpu/drm/nouveau/nvkm/core/notify.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright 2014 Red Hat Inc.
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Ben Skeggs <bskeggs@redhat.com>
+ */
+#include <core/notify.h>
+#include <core/event.h>
+
+static inline void
+nvkm_notify_put_locked(struct nvkm_notify *notify)
+{
+       if (notify->block++ == 0)
+               nvkm_event_put(notify->event, notify->types, notify->index);
+}
+
+void
+nvkm_notify_put(struct nvkm_notify *notify)
+{
+       struct nvkm_event *event = notify->event;
+       unsigned long flags;
+       if (likely(event) &&
+           test_and_clear_bit(NVKM_NOTIFY_USER, &notify->flags)) {
+               spin_lock_irqsave(&event->refs_lock, flags);
+               nvkm_notify_put_locked(notify);
+               spin_unlock_irqrestore(&event->refs_lock, flags);
+               if (test_bit(NVKM_NOTIFY_WORK, &notify->flags))
+                       flush_work(&notify->work);
+       }
+}
+
+static inline void
+nvkm_notify_get_locked(struct nvkm_notify *notify)
+{
+       if (--notify->block == 0)
+               nvkm_event_get(notify->event, notify->types, notify->index);
+}
+
+void
+nvkm_notify_get(struct nvkm_notify *notify)
+{
+       struct nvkm_event *event = notify->event;
+       unsigned long flags;
+       if (likely(event) &&
+           !test_and_set_bit(NVKM_NOTIFY_USER, &notify->flags)) {
+               spin_lock_irqsave(&event->refs_lock, flags);
+               nvkm_notify_get_locked(notify);
+               spin_unlock_irqrestore(&event->refs_lock, flags);
+       }
+}
+
+static inline void
+nvkm_notify_func(struct nvkm_notify *notify)
+{
+       struct nvkm_event *event = notify->event;
+       int ret = notify->func(notify);
+       unsigned long flags;
+       if ((ret == NVKM_NOTIFY_KEEP) ||
+           !test_and_clear_bit(NVKM_NOTIFY_USER, &notify->flags)) {
+               spin_lock_irqsave(&event->refs_lock, flags);
+               nvkm_notify_get_locked(notify);
+               spin_unlock_irqrestore(&event->refs_lock, flags);
+       }
+}
+
+static void
+nvkm_notify_work(struct work_struct *work)
+{
+       struct nvkm_notify *notify = container_of(work, typeof(*notify), work);
+       nvkm_notify_func(notify);
+}
+
+void
+nvkm_notify_send(struct nvkm_notify *notify, void *data, u32 size)
+{
+       struct nvkm_event *event = notify->event;
+       unsigned long flags;
+
+       assert_spin_locked(&event->list_lock);
+       BUG_ON(size != notify->size);
+
+       spin_lock_irqsave(&event->refs_lock, flags);
+       if (notify->block) {
+               spin_unlock_irqrestore(&event->refs_lock, flags);
+               return;
+       }
+       nvkm_notify_put_locked(notify);
+       spin_unlock_irqrestore(&event->refs_lock, flags);
+
+       if (test_bit(NVKM_NOTIFY_WORK, &notify->flags)) {
+               memcpy((void *)notify->data, data, size);
+               schedule_work(&notify->work);
+       } else {
+               notify->data = data;
+               nvkm_notify_func(notify);
+               notify->data = NULL;
+       }
+}
+
+void
+nvkm_notify_fini(struct nvkm_notify *notify)
+{
+       unsigned long flags;
+       if (notify->event) {
+               nvkm_notify_put(notify);
+               spin_lock_irqsave(&notify->event->list_lock, flags);
+               list_del(&notify->head);
+               spin_unlock_irqrestore(&notify->event->list_lock, flags);
+               kfree((void *)notify->data);
+               notify->event = NULL;
+       }
+}
+
+int
+nvkm_notify_init(struct nvkm_object *object, struct nvkm_event *event,
+                int (*func)(struct nvkm_notify *), bool work,
+                void *data, u32 size, u32 reply,
+                struct nvkm_notify *notify)
+{
+       unsigned long flags;
+       int ret = -ENODEV;
+       if ((notify->event = event), event->refs) {
+               ret = event->func->ctor(object, data, size, notify);
+               if (ret == 0 && (ret = -EINVAL, notify->size == reply)) {
+                       notify->flags = 0;
+                       notify->block = 1;
+                       notify->func = func;
+                       notify->data = NULL;
+                       if (ret = 0, work) {
+                               INIT_WORK(&notify->work, nvkm_notify_work);
+                               set_bit(NVKM_NOTIFY_WORK, &notify->flags);
+                               notify->data = kmalloc(reply, GFP_KERNEL);
+                               if (!notify->data)
+                                       ret = -ENOMEM;
+                       }
+               }
+               if (ret == 0) {
+                       spin_lock_irqsave(&event->list_lock, flags);
+                       list_add_tail(&notify->head, &event->list);
+                       spin_unlock_irqrestore(&event->list_lock, flags);
+               }
+       }
+       if (ret)
+               notify->event = NULL;
+       return ret;
+}