X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fgpu%2Fdrm%2Fnouveau%2Fnvkm%2Fcore%2Fnotify.c;fp=kernel%2Fdrivers%2Fgpu%2Fdrm%2Fnouveau%2Fnvkm%2Fcore%2Fnotify.c;h=023610d01458d6c4c7512de2527f9c06b69db1f2;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

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
index 000000000..023610d01
--- /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;
+}