drivers/infiniband/core/uverbs.h

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #ifndef UVERBS_H
  38 #define UVERBS_H
  39
  40 #include <linux/kref.h>
  41 #include <linux/idr.h>
  42 #include <linux/mutex.h>
  43 #include <linux/completion.h>
  44 #include <linux/cdev.h>
  45
  46 #include <rdma/ib_verbs.h>
  47 #include <rdma/ib_umem.h>
  48 #include <rdma/ib_user_verbs.h>
  49
  50 /*
  51  * Our lifetime rules for these structs are the following:
  52  *
  53  * struct ib_uverbs_device: One reference is held by the module and
  54  * released in ib_uverbs_remove_one().  Another reference is taken by
  55  * ib_uverbs_open() each time the character special file is opened,
  56  * and released in ib_uverbs_release_file() when the file is released.
  57  *
  58  * struct ib_uverbs_file: One reference is held by the VFS and
  59  * released when the file is closed.  Another reference is taken when
  60  * an asynchronous event queue file is created and released when the
  61  * event file is closed.
  62  *
  63  * struct ib_uverbs_event_file: One reference is held by the VFS and
  64  * released when the file is closed.  For asynchronous event files,
  65  * another reference is held by the corresponding main context file
  66  * and released when that file is closed.  For completion event files,
  67  * a reference is taken when a CQ is created that uses the file, and
  68  * released when the CQ is destroyed.
  69  */
  70
  71 struct ib_uverbs_device {
  72         struct kref                             ref;
  73         int                                     num_comp_vectors;
  74         struct completion                       comp;
  75         struct device                          *dev;
  76         struct ib_device                       *ib_dev;
  77         int                                     devnum;
  78         struct cdev                             cdev;
  79         struct rb_root                          xrcd_tree;
  80         struct mutex                            xrcd_tree_mutex;
  81 };
  82
  83 struct ib_uverbs_event_file {
  84         struct kref                             ref;
  85         int                                     is_async;
  86         struct ib_uverbs_file                  *uverbs_file;
  87         spinlock_t                              lock;
  88         int                                     is_closed;
  89         wait_queue_head_t                       poll_wait;
  90         struct fasync_struct                   *async_queue;
  91         struct list_head                        event_list;
  92 };
  93
  94 struct ib_uverbs_file {
  95         struct kref                             ref;
  96         struct mutex                            mutex;
  97         struct ib_uverbs_device                *device;
  98         struct ib_ucontext                     *ucontext;
  99         struct ib_event_handler                 event_handler;
 100         struct ib_uverbs_event_file            *async_file;
 101 };
 102
 103 struct ib_uverbs_event {
 104         union {
 105                 struct ib_uverbs_async_event_desc       async;
 106                 struct ib_uverbs_comp_event_desc        comp;
 107         }                                       desc;
 108         struct list_head                        list;
 109         struct list_head                        obj_list;
 110         u32                                    *counter;
 111 };
 112
 113 struct ib_uverbs_mcast_entry {
 114         struct list_head        list;
 115         union ib_gid            gid;
 116         u16                     lid;
 117 };
 118
 119 struct ib_uevent_object {
 120         struct ib_uobject       uobject;
 121         struct list_head        event_list;
 122         u32                     events_reported;
 123 };
 124
 125 struct ib_uxrcd_object {
 126         struct ib_uobject       uobject;
 127         atomic_t                refcnt;
 128 };
 129
 130 struct ib_usrq_object {
 131         struct ib_uevent_object uevent;
 132         struct ib_uxrcd_object *uxrcd;
 133 };
 134
 135 struct ib_uqp_object {
 136         struct ib_uevent_object uevent;
 137         struct list_head        mcast_list;
 138 };
 139
 140 struct ib_ucq_object {
 141         struct ib_uobject       uobject;
 142         struct ib_uverbs_file  *uverbs_file;
 143         struct list_head        comp_list;
 144         struct list_head        async_list;
 145         u32                     comp_events_reported;
 146         u32                     async_events_reported;
 147 };
 148
 149 extern spinlock_t ib_uverbs_idr_lock;
 150 extern struct idr ib_uverbs_pd_idr;
 151 extern struct idr ib_uverbs_mr_idr;
 152 extern struct idr ib_uverbs_mw_idr;
 153 extern struct idr ib_uverbs_ah_idr;
 154 extern struct idr ib_uverbs_cq_idr;
 155 extern struct idr ib_uverbs_qp_idr;
 156 extern struct idr ib_uverbs_srq_idr;
 157 extern struct idr ib_uverbs_xrcd_idr;
 158
 159 void idr_remove_uobj(struct idr *idp, struct ib_uobject *uobj);
 160
 161 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 162                                         int is_async);
 163 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd);
 164
 165 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 166                            struct ib_uverbs_event_file *ev_file,
 167                            struct ib_ucq_object *uobj);
 168 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 169                               struct ib_uevent_object *uobj);
 170
 171 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context);
 172 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr);
 173 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr);
 174 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr);
 175 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 176                              struct ib_event *event);
 177 void ib_uverbs_dealloc_xrcd(struct ib_uverbs_device *dev, struct ib_xrcd *xrcd);
 178
 179 #define IB_UVERBS_DECLARE_CMD(name)                                     \
 180         ssize_t ib_uverbs_##name(struct ib_uverbs_file *file,           \
 181                                  const char __user *buf, int in_len,    \
 182                                  int out_len)
 183
 184 IB_UVERBS_DECLARE_CMD(get_context);
 185 IB_UVERBS_DECLARE_CMD(query_device);
 186 IB_UVERBS_DECLARE_CMD(query_port);
 187 IB_UVERBS_DECLARE_CMD(alloc_pd);
 188 IB_UVERBS_DECLARE_CMD(dealloc_pd);
 189 IB_UVERBS_DECLARE_CMD(reg_mr);
 190 IB_UVERBS_DECLARE_CMD(dereg_mr);
 191 IB_UVERBS_DECLARE_CMD(alloc_mw);
 192 IB_UVERBS_DECLARE_CMD(dealloc_mw);
 193 IB_UVERBS_DECLARE_CMD(create_comp_channel);
 194 IB_UVERBS_DECLARE_CMD(create_cq);
 195 IB_UVERBS_DECLARE_CMD(resize_cq);
 196 IB_UVERBS_DECLARE_CMD(poll_cq);
 197 IB_UVERBS_DECLARE_CMD(req_notify_cq);
 198 IB_UVERBS_DECLARE_CMD(destroy_cq);
 199 IB_UVERBS_DECLARE_CMD(create_qp);
 200 IB_UVERBS_DECLARE_CMD(open_qp);
 201 IB_UVERBS_DECLARE_CMD(query_qp);
 202 IB_UVERBS_DECLARE_CMD(modify_qp);
 203 IB_UVERBS_DECLARE_CMD(destroy_qp);
 204 IB_UVERBS_DECLARE_CMD(post_send);
 205 IB_UVERBS_DECLARE_CMD(post_recv);
 206 IB_UVERBS_DECLARE_CMD(post_srq_recv);
 207 IB_UVERBS_DECLARE_CMD(create_ah);
 208 IB_UVERBS_DECLARE_CMD(destroy_ah);
 209 IB_UVERBS_DECLARE_CMD(attach_mcast);
 210 IB_UVERBS_DECLARE_CMD(detach_mcast);
 211 IB_UVERBS_DECLARE_CMD(create_srq);
 212 IB_UVERBS_DECLARE_CMD(modify_srq);
 213 IB_UVERBS_DECLARE_CMD(query_srq);
 214 IB_UVERBS_DECLARE_CMD(destroy_srq);
 215 IB_UVERBS_DECLARE_CMD(create_xsrq);
 216 IB_UVERBS_DECLARE_CMD(open_xrcd);
 217 IB_UVERBS_DECLARE_CMD(close_xrcd);
 218
 219 #endif /* UVERBS_H */