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

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2013 Cisco Systems.  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.
 */

#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
#include <linux/hugetlb.h>
#include <linux/iommu.h>
#include <linux/workqueue.h>
#include <linux/list.h>
#include <rdma/ib_verbs.h>

#include "usnic_log.h"
#include "usnic_uiom.h"
#include "usnic_uiom_interval_tree.h"

#define USNIC_UIOM_PAGE_CHUNK …

static int usnic_uiom_dma_fault(struct iommu_domain *domain,
				struct device *dev,
				unsigned long iova, int flags,
				void *token)
{ … }

static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty)
{ … }

static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
				int dmasync, struct usnic_uiom_reg *uiomr)
{ … }

static void usnic_uiom_unmap_sorted_intervals(struct list_head *intervals,
						struct usnic_uiom_pd *pd)
{ … }

static void __usnic_uiom_reg_release(struct usnic_uiom_pd *pd,
					struct usnic_uiom_reg *uiomr,
					int dirty)
{ … }

static int usnic_uiom_map_sorted_intervals(struct list_head *intervals,
						struct usnic_uiom_reg *uiomr)
{ … }

struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
						unsigned long addr, size_t size,
						int writable, int dmasync)
{ … }

static void __usnic_uiom_release_tail(struct usnic_uiom_reg *uiomr)
{ … }

static inline size_t usnic_uiom_num_pages(struct usnic_uiom_reg *uiomr)
{ … }

void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr)
{ … }

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)
{ … }