drivers/infiniband/core/uverbs_std_types_async_fd.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2019, Mellanox Technologies inc.  All rights reserved.
   4  */
   5
   6 #include <rdma/uverbs_std_types.h>
   7 #include <rdma/uverbs_ioctl.h>
   8 #include "rdma_core.h"
   9 #include "uverbs.h"
  10
  11 static int UVERBS_HANDLER(UVERBS_METHOD_ASYNC_EVENT_ALLOC)(
  12         struct uverbs_attr_bundle *attrs)
  13 {
  14         struct ib_uobject *uobj =
  15                 uverbs_attr_get_uobject(attrs, UVERBS_METHOD_ASYNC_EVENT_ALLOC);
  16
  17         ib_uverbs_init_async_event_file(
  18                 container_of(uobj, struct ib_uverbs_async_event_file, uobj));
  19         return 0;
  20 }
  21
  22 static void uverbs_async_event_destroy_uobj(struct ib_uobject *uobj,
  23                                             enum rdma_remove_reason why)
  24 {
  25         struct ib_uverbs_async_event_file *event_file =
  26                 container_of(uobj, struct ib_uverbs_async_event_file, uobj);
  27
  28         ib_unregister_event_handler(&event_file->event_handler);
  29
  30         if (why == RDMA_REMOVE_DRIVER_REMOVE)
  31                 ib_uverbs_async_handler(event_file, 0, IB_EVENT_DEVICE_FATAL,
  32                                         NULL, NULL);
  33 }
  34
  35 int uverbs_async_event_release(struct inode *inode, struct file *filp)
  36 {
  37         struct ib_uverbs_async_event_file *event_file;
  38         struct ib_uobject *uobj = filp->private_data;
  39         int ret;
  40
  41         if (!uobj)
  42                 return uverbs_uobject_fd_release(inode, filp);
  43
  44         event_file =
  45                 container_of(uobj, struct ib_uverbs_async_event_file, uobj);
  46
  47         /*
  48          * The async event FD has to deliver IB_EVENT_DEVICE_FATAL even after
  49          * disassociation, so cleaning the event list must only happen after
  50          * release. The user knows it has reached the end of the event stream
  51          * when it sees IB_EVENT_DEVICE_FATAL.
  52          */
  53         uverbs_uobject_get(uobj);
  54         ret = uverbs_uobject_fd_release(inode, filp);
  55         ib_uverbs_free_event_queue(&event_file->ev_queue);
  56         uverbs_uobject_put(uobj);
  57         return ret;
  58 }
  59
  60 DECLARE_UVERBS_NAMED_METHOD(
  61         UVERBS_METHOD_ASYNC_EVENT_ALLOC,
  62         UVERBS_ATTR_FD(UVERBS_ATTR_ASYNC_EVENT_ALLOC_FD_HANDLE,
  63                        UVERBS_OBJECT_ASYNC_EVENT,
  64                        UVERBS_ACCESS_NEW,
  65                        UA_MANDATORY));
  66
  67 DECLARE_UVERBS_NAMED_OBJECT(
  68         UVERBS_OBJECT_ASYNC_EVENT,
  69         UVERBS_TYPE_ALLOC_FD(sizeof(struct ib_uverbs_async_event_file),
  70                              uverbs_async_event_destroy_uobj,
  71                              &uverbs_async_event_fops,
  72                              "[infinibandevent]",
  73                              O_RDONLY),
  74         &UVERBS_METHOD(UVERBS_METHOD_ASYNC_EVENT_ALLOC));
  75
  76 const struct uapi_definition uverbs_def_obj_async_fd[] = {
  77         UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_ASYNC_EVENT),
  78         {}
  79 };