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uverbs_main.c

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
 * Copyright (c) 2005 PathScale, Inc. 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
 * OpenIB.org 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.
 *
 * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/cdev.h>

#include <asm/uaccess.h>

#include "uverbs.h"

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand userspace verbs access");
MODULE_LICENSE("Dual BSD/GPL");

#define INFINIBANDEVENTFS_MAGIC     0x49426576  /* "IBev" */

enum {
      IB_UVERBS_MAJOR       = 231,
      IB_UVERBS_BASE_MINOR  = 192,
      IB_UVERBS_MAX_DEVICES = 32
};

#define IB_UVERBS_BASE_DEV    MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)

static struct class *uverbs_class;

DEFINE_SPINLOCK(ib_uverbs_idr_lock);
DEFINE_IDR(ib_uverbs_pd_idr);
DEFINE_IDR(ib_uverbs_mr_idr);
DEFINE_IDR(ib_uverbs_mw_idr);
DEFINE_IDR(ib_uverbs_ah_idr);
DEFINE_IDR(ib_uverbs_cq_idr);
DEFINE_IDR(ib_uverbs_qp_idr);
DEFINE_IDR(ib_uverbs_srq_idr);

static spinlock_t map_lock;
static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);

static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
                             const char __user *buf, int in_len,
                             int out_len) = {
      [IB_USER_VERBS_CMD_GET_CONTEXT]     = ib_uverbs_get_context,
      [IB_USER_VERBS_CMD_QUERY_DEVICE]    = ib_uverbs_query_device,
      [IB_USER_VERBS_CMD_QUERY_PORT]      = ib_uverbs_query_port,
      [IB_USER_VERBS_CMD_ALLOC_PD]        = ib_uverbs_alloc_pd,
      [IB_USER_VERBS_CMD_DEALLOC_PD]      = ib_uverbs_dealloc_pd,
      [IB_USER_VERBS_CMD_REG_MR]          = ib_uverbs_reg_mr,
      [IB_USER_VERBS_CMD_DEREG_MR]        = ib_uverbs_dereg_mr,
      [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
      [IB_USER_VERBS_CMD_CREATE_CQ]       = ib_uverbs_create_cq,
      [IB_USER_VERBS_CMD_RESIZE_CQ]       = ib_uverbs_resize_cq,
      [IB_USER_VERBS_CMD_POLL_CQ]         = ib_uverbs_poll_cq,
      [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]         = ib_uverbs_req_notify_cq,
      [IB_USER_VERBS_CMD_DESTROY_CQ]      = ib_uverbs_destroy_cq,
      [IB_USER_VERBS_CMD_CREATE_QP]       = ib_uverbs_create_qp,
      [IB_USER_VERBS_CMD_QUERY_QP]        = ib_uverbs_query_qp,
      [IB_USER_VERBS_CMD_MODIFY_QP]       = ib_uverbs_modify_qp,
      [IB_USER_VERBS_CMD_DESTROY_QP]      = ib_uverbs_destroy_qp,
      [IB_USER_VERBS_CMD_POST_SEND]       = ib_uverbs_post_send,
      [IB_USER_VERBS_CMD_POST_RECV]       = ib_uverbs_post_recv,
      [IB_USER_VERBS_CMD_POST_SRQ_RECV]         = ib_uverbs_post_srq_recv,
      [IB_USER_VERBS_CMD_CREATE_AH]       = ib_uverbs_create_ah,
      [IB_USER_VERBS_CMD_DESTROY_AH]      = ib_uverbs_destroy_ah,
      [IB_USER_VERBS_CMD_ATTACH_MCAST]    = ib_uverbs_attach_mcast,
      [IB_USER_VERBS_CMD_DETACH_MCAST]    = ib_uverbs_detach_mcast,
      [IB_USER_VERBS_CMD_CREATE_SRQ]      = ib_uverbs_create_srq,
      [IB_USER_VERBS_CMD_MODIFY_SRQ]      = ib_uverbs_modify_srq,
      [IB_USER_VERBS_CMD_QUERY_SRQ]       = ib_uverbs_query_srq,
      [IB_USER_VERBS_CMD_DESTROY_SRQ]     = ib_uverbs_destroy_srq,
};

static struct vfsmount *uverbs_event_mnt;

static void ib_uverbs_add_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device);

static void ib_uverbs_release_dev(struct kref *ref)
{
      struct ib_uverbs_device *dev =
            container_of(ref, struct ib_uverbs_device, ref);

      complete(&dev->comp);
}

static void ib_uverbs_release_event_file(struct kref *ref)
{
      struct ib_uverbs_event_file *file =
            container_of(ref, struct ib_uverbs_event_file, ref);

      kfree(file);
}

void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
                    struct ib_uverbs_event_file *ev_file,
                    struct ib_ucq_object *uobj)
{
      struct ib_uverbs_event *evt, *tmp;

      if (ev_file) {
            spin_lock_irq(&ev_file->lock);
            list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
                  list_del(&evt->list);
                  kfree(evt);
            }
            spin_unlock_irq(&ev_file->lock);

            kref_put(&ev_file->ref, ib_uverbs_release_event_file);
      }

      spin_lock_irq(&file->async_file->lock);
      list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
            list_del(&evt->list);
            kfree(evt);
      }
      spin_unlock_irq(&file->async_file->lock);
}

void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
                        struct ib_uevent_object *uobj)
{
      struct ib_uverbs_event *evt, *tmp;

      spin_lock_irq(&file->async_file->lock);
      list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
            list_del(&evt->list);
            kfree(evt);
      }
      spin_unlock_irq(&file->async_file->lock);
}

static void ib_uverbs_detach_umcast(struct ib_qp *qp,
                            struct ib_uqp_object *uobj)
{
      struct ib_uverbs_mcast_entry *mcast, *tmp;

      list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
            ib_detach_mcast(qp, &mcast->gid, mcast->lid);
            list_del(&mcast->list);
            kfree(mcast);
      }
}

static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
                              struct ib_ucontext *context)
{
      struct ib_uobject *uobj, *tmp;

      if (!context)
            return 0;

      context->closing = 1;

      list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
            struct ib_ah *ah = uobj->object;

            idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
            ib_destroy_ah(ah);
            kfree(uobj);
      }

      list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
            struct ib_qp *qp = uobj->object;
            struct ib_uqp_object *uqp =
                  container_of(uobj, struct ib_uqp_object, uevent.uobject);

            idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
            ib_uverbs_detach_umcast(qp, uqp);
            ib_destroy_qp(qp);
            ib_uverbs_release_uevent(file, &uqp->uevent);
            kfree(uqp);
      }

      list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
            struct ib_cq *cq = uobj->object;
            struct ib_uverbs_event_file *ev_file = cq->cq_context;
            struct ib_ucq_object *ucq =
                  container_of(uobj, struct ib_ucq_object, uobject);

            idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
            ib_destroy_cq(cq);
            ib_uverbs_release_ucq(file, ev_file, ucq);
            kfree(ucq);
      }

      list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
            struct ib_srq *srq = uobj->object;
            struct ib_uevent_object *uevent =
                  container_of(uobj, struct ib_uevent_object, uobject);

            idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
            ib_destroy_srq(srq);
            ib_uverbs_release_uevent(file, uevent);
            kfree(uevent);
      }

      /* XXX Free MWs */

      list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
            struct ib_mr *mr = uobj->object;

            idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
            ib_dereg_mr(mr);
            kfree(uobj);
      }

      list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
            struct ib_pd *pd = uobj->object;

            idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
            ib_dealloc_pd(pd);
            kfree(uobj);
      }

      return context->device->dealloc_ucontext(context);
}

static void ib_uverbs_release_file(struct kref *ref)
{
      struct ib_uverbs_file *file =
            container_of(ref, struct ib_uverbs_file, ref);

      module_put(file->device->ib_dev->owner);
      kref_put(&file->device->ref, ib_uverbs_release_dev);

      kfree(file);
}

static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
                            size_t count, loff_t *pos)
{
      struct ib_uverbs_event_file *file = filp->private_data;
      struct ib_uverbs_event *event;
      int eventsz;
      int ret = 0;

      spin_lock_irq(&file->lock);

      while (list_empty(&file->event_list)) {
            spin_unlock_irq(&file->lock);

            if (filp->f_flags & O_NONBLOCK)
                  return -EAGAIN;

            if (wait_event_interruptible(file->poll_wait,
                                   !list_empty(&file->event_list)))
                  return -ERESTARTSYS;

            spin_lock_irq(&file->lock);
      }

      event = list_entry(file->event_list.next, struct ib_uverbs_event, list);

      if (file->is_async)
            eventsz = sizeof (struct ib_uverbs_async_event_desc);
      else
            eventsz = sizeof (struct ib_uverbs_comp_event_desc);

      if (eventsz > count) {
            ret   = -EINVAL;
            event = NULL;
      } else {
            list_del(file->event_list.next);
            if (event->counter) {
                  ++(*event->counter);
                  list_del(&event->obj_list);
            }
      }

      spin_unlock_irq(&file->lock);

      if (event) {
            if (copy_to_user(buf, event, eventsz))
                  ret = -EFAULT;
            else
                  ret = eventsz;
      }

      kfree(event);

      return ret;
}

static unsigned int ib_uverbs_event_poll(struct file *filp,
                               struct poll_table_struct *wait)
{
      unsigned int pollflags = 0;
      struct ib_uverbs_event_file *file = filp->private_data;

      poll_wait(filp, &file->poll_wait, wait);

      spin_lock_irq(&file->lock);
      if (!list_empty(&file->event_list))
            pollflags = POLLIN | POLLRDNORM;
      spin_unlock_irq(&file->lock);

      return pollflags;
}

static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
{
      struct ib_uverbs_event_file *file = filp->private_data;

      return fasync_helper(fd, filp, on, &file->async_queue);
}

static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
{
      struct ib_uverbs_event_file *file = filp->private_data;
      struct ib_uverbs_event *entry, *tmp;

      spin_lock_irq(&file->lock);
      file->file = NULL;
      list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
            if (entry->counter)
                  list_del(&entry->obj_list);
            kfree(entry);
      }
      spin_unlock_irq(&file->lock);

      ib_uverbs_event_fasync(-1, filp, 0);

      if (file->is_async) {
            ib_unregister_event_handler(&file->uverbs_file->event_handler);
            kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
      }
      kref_put(&file->ref, ib_uverbs_release_event_file);

      return 0;
}

static const struct file_operations uverbs_event_fops = {
      .owner       = THIS_MODULE,
      .read        = ib_uverbs_event_read,
      .poll    = ib_uverbs_event_poll,
      .release = ib_uverbs_event_close,
      .fasync  = ib_uverbs_event_fasync
};

void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
{
      struct ib_uverbs_event_file    *file = cq_context;
      struct ib_ucq_object           *uobj;
      struct ib_uverbs_event         *entry;
      unsigned long                 flags;

      if (!file)
            return;

      spin_lock_irqsave(&file->lock, flags);
      if (!file->file) {
            spin_unlock_irqrestore(&file->lock, flags);
            return;
      }

      entry = kmalloc(sizeof *entry, GFP_ATOMIC);
      if (!entry) {
            spin_unlock_irqrestore(&file->lock, flags);
            return;
      }

      uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);

      entry->desc.comp.cq_handle = cq->uobject->user_handle;
      entry->counter             = &uobj->comp_events_reported;

      list_add_tail(&entry->list, &file->event_list);
      list_add_tail(&entry->obj_list, &uobj->comp_list);
      spin_unlock_irqrestore(&file->lock, flags);

      wake_up_interruptible(&file->poll_wait);
      kill_fasync(&file->async_queue, SIGIO, POLL_IN);
}

static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
                            __u64 element, __u64 event,
                            struct list_head *obj_list,
                            u32 *counter)
{
      struct ib_uverbs_event *entry;
      unsigned long flags;

      spin_lock_irqsave(&file->async_file->lock, flags);
      if (!file->async_file->file) {
            spin_unlock_irqrestore(&file->async_file->lock, flags);
            return;
      }

      entry = kmalloc(sizeof *entry, GFP_ATOMIC);
      if (!entry) {
            spin_unlock_irqrestore(&file->async_file->lock, flags);
            return;
      }

      entry->desc.async.element    = element;
      entry->desc.async.event_type = event;
      entry->counter               = counter;

      list_add_tail(&entry->list, &file->async_file->event_list);
      if (obj_list)
            list_add_tail(&entry->obj_list, obj_list);
      spin_unlock_irqrestore(&file->async_file->lock, flags);

      wake_up_interruptible(&file->async_file->poll_wait);
      kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
}

void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
{
      struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
                                      struct ib_ucq_object, uobject);

      ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
                        event->event, &uobj->async_list,
                        &uobj->async_events_reported);
}

void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
{
      struct ib_uevent_object *uobj;

      uobj = container_of(event->element.qp->uobject,
                      struct ib_uevent_object, uobject);

      ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
                        event->event, &uobj->event_list,
                        &uobj->events_reported);
}

void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
{
      struct ib_uevent_object *uobj;

      uobj = container_of(event->element.srq->uobject,
                      struct ib_uevent_object, uobject);

      ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
                        event->event, &uobj->event_list,
                        &uobj->events_reported);
}

void ib_uverbs_event_handler(struct ib_event_handler *handler,
                       struct ib_event *event)
{
      struct ib_uverbs_file *file =
            container_of(handler, struct ib_uverbs_file, event_handler);

      ib_uverbs_async_handler(file, event->element.port_num, event->event,
                        NULL, NULL);
}

struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
                              int is_async, int *fd)
{
      struct ib_uverbs_event_file *ev_file;
      struct file *filp;
      int ret;

      ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
      if (!ev_file)
            return ERR_PTR(-ENOMEM);

      kref_init(&ev_file->ref);
      spin_lock_init(&ev_file->lock);
      INIT_LIST_HEAD(&ev_file->event_list);
      init_waitqueue_head(&ev_file->poll_wait);
      ev_file->uverbs_file = uverbs_file;
      ev_file->async_queue = NULL;
      ev_file->is_async    = is_async;

      *fd = get_unused_fd();
      if (*fd < 0) {
            ret = *fd;
            goto err;
      }

      filp = get_empty_filp();
      if (!filp) {
            ret = -ENFILE;
            goto err_fd;
      }

      ev_file->file      = filp;

      /*
       * fops_get() can't fail here, because we're coming from a
       * system call on a uverbs file, which will already have a
       * module reference.
       */
      filp->f_op     = fops_get(&uverbs_event_fops);
      filp->f_path.mnt     = mntget(uverbs_event_mnt);
      filp->f_path.dentry        = dget(uverbs_event_mnt->mnt_root);
      filp->f_mapping    = filp->f_path.dentry->d_inode->i_mapping;
      filp->f_flags      = O_RDONLY;
      filp->f_mode       = FMODE_READ;
      filp->private_data = ev_file;

      return filp;

err_fd:
      put_unused_fd(*fd);

err:
      kfree(ev_file);
      return ERR_PTR(ret);
}

/*
 * Look up a completion event file by FD.  If lookup is successful,
 * takes a ref to the event file struct that it returns; if
 * unsuccessful, returns NULL.
 */
struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
{
      struct ib_uverbs_event_file *ev_file = NULL;
      struct file *filp;

      filp = fget(fd);
      if (!filp)
            return NULL;

      if (filp->f_op != &uverbs_event_fops)
            goto out;

      ev_file = filp->private_data;
      if (ev_file->is_async) {
            ev_file = NULL;
            goto out;
      }

      kref_get(&ev_file->ref);

out:
      fput(filp);
      return ev_file;
}

static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
                       size_t count, loff_t *pos)
{
      struct ib_uverbs_file *file = filp->private_data;
      struct ib_uverbs_cmd_hdr hdr;

      if (count < sizeof hdr)
            return -EINVAL;

      if (copy_from_user(&hdr, buf, sizeof hdr))
            return -EFAULT;

      if (hdr.in_words * 4 != count)
            return -EINVAL;

      if (hdr.command < 0                       ||
          hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
          !uverbs_cmd_table[hdr.command]        ||
          !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
            return -EINVAL;

      if (!file->ucontext &&
          hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
            return -EINVAL;

      return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
                                   hdr.in_words * 4, hdr.out_words * 4);
}

static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
{
      struct ib_uverbs_file *file = filp->private_data;

      if (!file->ucontext)
            return -ENODEV;
      else
            return file->device->ib_dev->mmap(file->ucontext, vma);
}

static int ib_uverbs_open(struct inode *inode, struct file *filp)
{
      struct ib_uverbs_device *dev;
      struct ib_uverbs_file *file;
      int ret;

      spin_lock(&map_lock);
      dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
      if (dev)
            kref_get(&dev->ref);
      spin_unlock(&map_lock);

      if (!dev)
            return -ENXIO;

      if (!try_module_get(dev->ib_dev->owner)) {
            ret = -ENODEV;
            goto err;
      }

      file = kmalloc(sizeof *file, GFP_KERNEL);
      if (!file) {
            ret = -ENOMEM;
            goto err_module;
      }

      file->device       = dev;
      file->ucontext     = NULL;
      file->async_file = NULL;
      kref_init(&file->ref);
      mutex_init(&file->mutex);

      filp->private_data = file;

      return 0;

err_module:
      module_put(dev->ib_dev->owner);

err:
      kref_put(&dev->ref, ib_uverbs_release_dev);

      return ret;
}

static int ib_uverbs_close(struct inode *inode, struct file *filp)
{
      struct ib_uverbs_file *file = filp->private_data;

      ib_uverbs_cleanup_ucontext(file, file->ucontext);

      if (file->async_file)
            kref_put(&file->async_file->ref, ib_uverbs_release_event_file);

      kref_put(&file->ref, ib_uverbs_release_file);

      return 0;
}

static const struct file_operations uverbs_fops = {
      .owner       = THIS_MODULE,
      .write       = ib_uverbs_write,
      .open        = ib_uverbs_open,
      .release = ib_uverbs_close
};

static const struct file_operations uverbs_mmap_fops = {
      .owner       = THIS_MODULE,
      .write       = ib_uverbs_write,
      .mmap    = ib_uverbs_mmap,
      .open        = ib_uverbs_open,
      .release = ib_uverbs_close
};

static struct ib_client uverbs_client = {
      .name   = "uverbs",
      .add    = ib_uverbs_add_one,
      .remove = ib_uverbs_remove_one
};

static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
      struct ib_uverbs_device *dev = class_get_devdata(class_dev);

      if (!dev)
            return -ENODEV;

      return sprintf(buf, "%s\n", dev->ib_dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);

static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
{
      struct ib_uverbs_device *dev = class_get_devdata(class_dev);

      if (!dev)
            return -ENODEV;

      return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
}
static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);

static ssize_t show_abi_version(struct class *class, char *buf)
{
      return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
}
static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);

static void ib_uverbs_add_one(struct ib_device *device)
{
      struct ib_uverbs_device *uverbs_dev;

      if (!device->alloc_ucontext)
            return;

      uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
      if (!uverbs_dev)
            return;

      kref_init(&uverbs_dev->ref);
      init_completion(&uverbs_dev->comp);

      spin_lock(&map_lock);
      uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
      if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
            spin_unlock(&map_lock);
            goto err;
      }
      set_bit(uverbs_dev->devnum, dev_map);
      spin_unlock(&map_lock);

      uverbs_dev->ib_dev           = device;
      uverbs_dev->num_comp_vectors = device->num_comp_vectors;

      uverbs_dev->dev = cdev_alloc();
      if (!uverbs_dev->dev)
            goto err;
      uverbs_dev->dev->owner = THIS_MODULE;
      uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
      kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
      if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
            goto err_cdev;

      uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
                                        uverbs_dev->dev->dev,
                                        device->dma_device,
                                        "uverbs%d", uverbs_dev->devnum);
      if (IS_ERR(uverbs_dev->class_dev))
            goto err_cdev;

      class_set_devdata(uverbs_dev->class_dev, uverbs_dev);

      if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
            goto err_class;
      if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
            goto err_class;

      spin_lock(&map_lock);
      dev_table[uverbs_dev->devnum] = uverbs_dev;
      spin_unlock(&map_lock);

      ib_set_client_data(device, &uverbs_client, uverbs_dev);

      return;

err_class:
      class_device_destroy(uverbs_class, uverbs_dev->dev->dev);

err_cdev:
      cdev_del(uverbs_dev->dev);
      clear_bit(uverbs_dev->devnum, dev_map);

err:
      kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
      wait_for_completion(&uverbs_dev->comp);
      kfree(uverbs_dev);
      return;
}

static void ib_uverbs_remove_one(struct ib_device *device)
{
      struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);

      if (!uverbs_dev)
            return;

      class_set_devdata(uverbs_dev->class_dev, NULL);
      class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
      cdev_del(uverbs_dev->dev);

      spin_lock(&map_lock);
      dev_table[uverbs_dev->devnum] = NULL;
      spin_unlock(&map_lock);

      clear_bit(uverbs_dev->devnum, dev_map);

      kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
      wait_for_completion(&uverbs_dev->comp);
      kfree(uverbs_dev);
}

static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
                         const char *dev_name, void *data,
                         struct vfsmount *mnt)
{
      return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
                       INFINIBANDEVENTFS_MAGIC, mnt);
}

static struct file_system_type uverbs_event_fs = {
      /* No owner field so module can be unloaded */
      .name    = "infinibandeventfs",
      .get_sb  = uverbs_event_get_sb,
      .kill_sb = kill_litter_super
};

static int __init ib_uverbs_init(void)
{
      int ret;

      spin_lock_init(&map_lock);

      ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
                             "infiniband_verbs");
      if (ret) {
            printk(KERN_ERR "user_verbs: couldn't register device number\n");
            goto out;
      }

      uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
      if (IS_ERR(uverbs_class)) {
            ret = PTR_ERR(uverbs_class);
            printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
            goto out_chrdev;
      }

      ret = class_create_file(uverbs_class, &class_attr_abi_version);
      if (ret) {
            printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
            goto out_class;
      }

      ret = register_filesystem(&uverbs_event_fs);
      if (ret) {
            printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
            goto out_class;
      }

      uverbs_event_mnt = kern_mount(&uverbs_event_fs);
      if (IS_ERR(uverbs_event_mnt)) {
            ret = PTR_ERR(uverbs_event_mnt);
            printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
            goto out_fs;
      }

      ret = ib_register_client(&uverbs_client);
      if (ret) {
            printk(KERN_ERR "user_verbs: couldn't register client\n");
            goto out_mnt;
      }

      return 0;

out_mnt:
      mntput(uverbs_event_mnt);

out_fs:
      unregister_filesystem(&uverbs_event_fs);

out_class:
      class_destroy(uverbs_class);

out_chrdev:
      unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);

out:
      return ret;
}

static void __exit ib_uverbs_cleanup(void)
{
      ib_unregister_client(&uverbs_client);
      mntput(uverbs_event_mnt);
      unregister_filesystem(&uverbs_event_fs);
      class_destroy(uverbs_class);
      unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
      idr_destroy(&ib_uverbs_pd_idr);
      idr_destroy(&ib_uverbs_mr_idr);
      idr_destroy(&ib_uverbs_mw_idr);
      idr_destroy(&ib_uverbs_ah_idr);
      idr_destroy(&ib_uverbs_cq_idr);
      idr_destroy(&ib_uverbs_qp_idr);
      idr_destroy(&ib_uverbs_srq_idr);
}

module_init(ib_uverbs_init);
module_exit(ib_uverbs_cleanup);

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