drivers/infiniband/hw/usnic/usnic_uiom.h

   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
  50 struct usnic_uiom_dev {
  51         struct device                   *dev;
  52         struct list_head                link;
  53 };
  54
  55 struct 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
  63 struct 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
  76 struct usnic_uiom_chunk {
  77         struct list_head                list;
  78         int                             nents;
  79         struct scatterlist              page_list[0];
  80 };
  81
  82 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
  83 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
  84 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
  85 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
  86                                         struct device *dev);
  87 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
  88 void usnic_uiom_free_dev_list(struct device **devs);
  89 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
  90                                                 unsigned long addr, size_t size,
  91                                                 int access, int dmasync);
  92 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing);
  93 int usnic_uiom_init(char *drv_name);
  94 void usnic_uiom_fini(void);
  95 #endif /* USNIC_UIOM_H_ */