linux/drivers/infiniband/hw/usnic/usnic_uiom.h

/*
 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * 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 AUTHORS OR COPYRIGHT HOLDERS
 * 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.
 *
 */

#ifndef USNIC_UIOM_H_
#define USNIC_UIOM_H_

#include <linux/list.h>
#include <linux/scatterlist.h>

#include "usnic_uiom_interval_tree.h"

struct ib_ucontext;

#define USNIC_UIOM_READ			(1)
#define USNIC_UIOM_WRITE		(2)

#define USNIC_UIOM_MAX_PD_CNT		(1000)
#define USNIC_UIOM_MAX_MR_CNT		(1000000)
#define USNIC_UIOM_MAX_MR_SIZE		(~0UL)
#define USNIC_UIOM_PAGE_SIZE		(PAGE_SIZE)

struct usnic_uiom_dev {
	struct device			*dev;
	struct list_head		link;
};

struct usnic_uiom_pd {
	struct iommu_domain		*domain;
	spinlock_t			lock;
	struct rb_root_cached		root;
	struct list_head		devs;
	int				dev_cnt;
};

struct usnic_uiom_reg {
	struct usnic_uiom_pd		*pd;
	unsigned long			va;
	size_t				length;
	int				offset;
	int				page_size;
	int				writable;
	struct list_head		chunk_list;
	struct work_struct		work;
	struct mm_struct		*owning_mm;
};

struct usnic_uiom_chunk {
	struct list_head		list;
	int				nents;
	struct scatterlist		page_list[] __counted_by(nents);
};

struct usnic_uiom_pd *usnic_uiom_alloc_pd(struct device *dev);
void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
					struct device *dev);
struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
void usnic_uiom_free_dev_list(struct device **devs);
struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
						unsigned long addr, size_t size,
						int access, int dmasync);
void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr);
#endif /* USNIC_UIOM_H_ */