LXR linux/drivers/infiniband/hw/usnic/usnic

   1/*
   2 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 *
  32 */
  33
  34#ifndef USNIC_UIOM_H_
  35#define USNIC_UIOM_H_
  36
  37#include <linux/list.h>
  38#include <linux/scatterlist.h>
  39
  40#include "usnic_uiom_interval_tree.h"
  41
  42#define USNIC_UIOM_READ                 (1)
  43#define USNIC_UIOM_WRITE                (2)
  44
  45#define USNIC_UIOM_MAX_PD_CNT           (1000)
  46#define USNIC_UIOM_MAX_MR_CNT           (1000000)
  47#define USNIC_UIOM_MAX_MR_SIZE          (~0UL)
  48#define USNIC_UIOM_PAGE_SIZE            (PAGE_SIZE)
  49
  50struct usnic_uiom_dev {
  51        struct device                   *dev;
  52        struct list_head                link;
  53};
  54
  55struct usnic_uiom_pd {
  56        struct iommu_domain             *domain;
  57        spinlock_t                      lock;
  58        struct rb_root                  rb_root;
  59        struct list_head                devs;
  60        int                             dev_cnt;
  61};
  62
  63struct usnic_uiom_reg {
  64        struct usnic_uiom_pd            *pd;
  65        unsigned long                   va;
  66        size_t                          length;
  67        int                             offset;
  68        int                             page_size;
  69        int                             writable;
  70        struct list_head                chunk_list;
  71        struct work_struct              work;
  72        struct mm_struct                *mm;
  73        unsigned long                   diff;
  74};
  75
  76struct usnic_uiom_chunk {
  77        struct list_head                list;
  78        int                             nents;
  79        struct scatterlist              page_list[0];
  80};
  81
  82struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
  83void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
  84int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
  85void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
  86                                        struct device *dev);
  87struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
  88void usnic_uiom_free_dev_list(struct device **devs);
  89struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
  90                                                unsigned long addr, size_t size,
  91                                                int access, int dmasync);
  92void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing);
  93int usnic_uiom_init(char *drv_name);
  94void usnic_uiom_fini(void);
  95#endif /* USNIC_UIOM_H_ */
  96