drm/nouveau/disp: clear notify intr status when enabling, to prevent races

[deliverable/linux.git] / drivers / gpu / drm / nouveau / nouveau_nvif.c

/*
 * 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>
 */

/*******************************************************************************
 * NVIF client driver - NVKM directly linked
 ******************************************************************************/

#include <core/client.h>
#include <core/notify.h>
#include <core/ioctl.h>

#include <nvif/client.h>
#include <nvif/driver.h>
#include <nvif/notify.h>
#include <nvif/event.h>
#include <nvif/ioctl.h>

#include "nouveau_drm.h"
#include "nouveau_usif.h"

static void
nvkm_client_unmap(void *priv, void __iomem *ptr, u32 size)
{
	iounmap(ptr);
}

static void __iomem *
nvkm_client_map(void *priv, u64 handle, u32 size)
{
	return ioremap(handle, size);
}

static int
nvkm_client_ioctl(void *priv, bool super, void *data, u32 size, void **hack)
{
	return nvkm_ioctl(priv, super, data, size, hack);
}

static int
nvkm_client_resume(void *priv)
{
	return nouveau_client_init(priv);
}

static int
nvkm_client_suspend(void *priv)
{
	return nouveau_client_fini(priv, true);
}

static void
nvkm_client_fini(void *priv)
{
	struct nouveau_object *client = priv;
	nouveau_client_fini(nv_client(client), false);
	atomic_set(&client->refcount, 1);
	nouveau_object_ref(NULL, &client);
}

static int
nvkm_client_ntfy(const void *header, u32 length, const void *data, u32 size)
{
	const union {
		struct nvif_notify_req_v0 v0;
	} *args = header;
	u8 route;

	if (length == sizeof(args->v0) && args->v0.version == 0) {
		route = args->v0.route;
	} else {
		WARN_ON(1);
		return NVKM_NOTIFY_DROP;
	}

	switch (route) {
	case NVDRM_NOTIFY_NVIF:
		return nvif_notify(header, length, data, size);
	case NVDRM_NOTIFY_USIF:
		return usif_notify(header, length, data, size);
	default:
		WARN_ON(1);
		break;
	}

	return NVKM_NOTIFY_DROP;
}

static int
nvkm_client_init(const char *name, u64 device, const char *cfg,
		 const char *dbg, void **ppriv)
{
	struct nouveau_client *client;
	int ret;

	ret = nouveau_client_create(name, device, cfg, dbg, &client);
	*ppriv = client;
	if (ret)
		return ret;

	client->ntfy = nvkm_client_ntfy;
	return 0;
}

const struct nvif_driver
nvif_driver_nvkm = {
	.name = "nvkm",
	.init = nvkm_client_init,
	.fini = nvkm_client_fini,
	.suspend = nvkm_client_suspend,
	.resume = nvkm_client_resume,
	.ioctl = nvkm_client_ioctl,
	.map = nvkm_client_map,
	.unmap = nvkm_client_unmap,
	.keep = false,
};