drm/nouveau/core: basic event interface between core and drm

nouveau-y += core/core/engctx.o

nouveau-y += core/core/engctx.o

nouveau-y += core/core/engine.o

nouveau-y += core/core/engine.o

nouveau-y += core/core/enum.o

nouveau-y += core/core/enum.o

nouveau-y += core/core/event.o

nouveau-y += core/core/falcon.o

nouveau-y += core/core/falcon.o

nouveau-y += core/core/gpuobj.o

nouveau-y += core/core/gpuobj.o

nouveau-y += core/core/handle.o

nouveau-y += core/core/handle.o

/*

 * Copyright 2013 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.

 */

#include <core/os.h>

#include <core/event.h>

static void

nouveau_event_put_locked(struct nouveau_event *event, int index,

			 struct nouveau_eventh *handler)

{

	if (!--event->index[index].refs)

		event->disable(event, index);

	list_del(&handler->head);

}

void

nouveau_event_put(struct nouveau_event *event, int index,

		  struct nouveau_eventh *handler)

{

	unsigned long flags;

	spin_lock_irqsave(&event->lock, flags);

	if (index < event->index_nr)

		nouveau_event_put_locked(event, index, handler);

	spin_unlock_irqrestore(&event->lock, flags);

}

void

nouveau_event_get(struct nouveau_event *event, int index,

		  struct nouveau_eventh *handler)

{

	unsigned long flags;

	spin_lock_irqsave(&event->lock, flags);

	if (index < event->index_nr) {

		list_add(&handler->head, &event->index[index].list);

		if (!event->index[index].refs++)

			event->enable(event, index);

	}

	spin_unlock_irqrestore(&event->lock, flags);

}

void

nouveau_event_trigger(struct nouveau_event *event, int index)

{

	struct nouveau_eventh *handler, *temp;

	unsigned long flags;

	if (index >= event->index_nr)

		return;

	spin_lock_irqsave(&event->lock, flags);

	list_for_each_entry_safe(handler, temp, &event->index[index].list, head) {

		if (handler->func(handler, index) == NVKM_EVENT_DROP) {

			nouveau_event_put_locked(event, index, handler);

		}

	}

	spin_unlock_irqrestore(&event->lock, flags);

}

void

nouveau_event_destroy(struct nouveau_event **pevent)

{

	struct nouveau_event *event = *pevent;

	if (event) {

		kfree(event);

		*pevent = NULL;

	}

}

int

nouveau_event_create(int index_nr, struct nouveau_event **pevent)

{

	struct nouveau_event *event;

	int i;

	event = *pevent = kzalloc(sizeof(*event) + index_nr *

				  sizeof(event->index[0]), GFP_KERNEL);

	if (!event)

		return -ENOMEM;

	spin_lock_init(&event->lock);

	for (i = 0; i < index_nr; i++)

		INIT_LIST_HEAD(&event->index[i].list);

	event->index_nr = index_nr;

	return 0;

}

#ifndef __NVKM_EVENT_H__

#define __NVKM_EVENT_H__

/* return codes from event handlers */

#define NVKM_EVENT_DROP 0

#define NVKM_EVENT_KEEP 1

struct nouveau_eventh {

	struct list_head head;

	int (*func)(struct nouveau_eventh *, int index);

};

struct nouveau_event {

	spinlock_t lock;

	void *priv;

	void (*enable)(struct nouveau_event *, int index);

	void (*disable)(struct nouveau_event *, int index);

	int index_nr;

	struct {

		struct list_head list;

		int refs;

	} index[];

};

int  nouveau_event_create(int index_nr, struct nouveau_event **);

void nouveau_event_destroy(struct nouveau_event **);

void nouveau_event_trigger(struct nouveau_event *, int index);

void nouveau_event_get(struct nouveau_event *, int index,

		       struct nouveau_eventh *);

void nouveau_event_put(struct nouveau_event *, int index,

		       struct nouveau_eventh *);

#endif