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[PATCH] IB uverbs: core implementation

Browse source 
Add the core of the InfiniBand userspace verbs implementation, including
creating character device nodes, dispatching requests from userspace, and
passing event notifications back up to userspace.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roland Dreier 2005-07-07 17:57:13 -07:00 committed by Linus Torvalds
parent 8a96b3f9af
commit bc38a6abdd
3 changed files with 1836 additions and 0 deletions
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132
drivers/infiniband/core/uverbs.h Normal file
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/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Cisco Systems. 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.h 2559 2005-06-06 19:43:16Z roland $
*/
#ifndef UVERBS_H
#define UVERBS_H
/* Include device.h and fs.h until cdev.h is self-sufficient */
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/kref.h>
#include <linux/idr.h>
#include <ib_verbs.h>
#include <ib_user_verbs.h>
struct ib_uverbs_device {
int devnum;
struct cdev dev;
struct class_device class_dev;
struct ib_device *ib_dev;
int num_comp;
};
struct ib_uverbs_event_file {
struct kref ref;
struct ib_uverbs_file *uverbs_file;
spinlock_t lock;
int fd;
int is_async;
wait_queue_head_t poll_wait;
struct list_head event_list;
};
struct ib_uverbs_file {
struct kref ref;
struct ib_uverbs_device *device;
struct ib_ucontext *ucontext;
struct ib_event_handler event_handler;
struct ib_uverbs_event_file async_file;
struct ib_uverbs_event_file comp_file[1];
};
struct ib_uverbs_async_event {
struct ib_uverbs_async_event_desc desc;
struct list_head list;
};
struct ib_uverbs_comp_event {
struct ib_uverbs_comp_event_desc desc;
struct list_head list;
};
struct ib_uobject_mr {
struct ib_uobject uobj;
struct page *page_list;
struct scatterlist *sg_list;
};
extern struct semaphore ib_uverbs_idr_mutex;
extern struct idr ib_uverbs_pd_idr;
extern struct idr ib_uverbs_mr_idr;
extern struct idr ib_uverbs_mw_idr;
extern struct idr ib_uverbs_ah_idr;
extern struct idr ib_uverbs_cq_idr;
extern struct idr ib_uverbs_qp_idr;
void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context);
void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr);
void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr);
int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
void *addr, size_t size, int write);
void ib_umem_release(struct ib_device *dev, struct ib_umem *umem);
void ib_umem_release_on_close(struct ib_device *dev, struct ib_umem *umem);
#define IB_UVERBS_DECLARE_CMD(name) \
ssize_t ib_uverbs_##name(struct ib_uverbs_file *file, \
const char __user *buf, int in_len, \
int out_len)
IB_UVERBS_DECLARE_CMD(query_params);
IB_UVERBS_DECLARE_CMD(get_context);
IB_UVERBS_DECLARE_CMD(query_device);
IB_UVERBS_DECLARE_CMD(query_port);
IB_UVERBS_DECLARE_CMD(query_gid);
IB_UVERBS_DECLARE_CMD(query_pkey);
IB_UVERBS_DECLARE_CMD(alloc_pd);
IB_UVERBS_DECLARE_CMD(dealloc_pd);
IB_UVERBS_DECLARE_CMD(reg_mr);
IB_UVERBS_DECLARE_CMD(dereg_mr);
IB_UVERBS_DECLARE_CMD(create_cq);
IB_UVERBS_DECLARE_CMD(destroy_cq);
IB_UVERBS_DECLARE_CMD(create_qp);
IB_UVERBS_DECLARE_CMD(modify_qp);
IB_UVERBS_DECLARE_CMD(destroy_qp);
IB_UVERBS_DECLARE_CMD(attach_mcast);
IB_UVERBS_DECLARE_CMD(detach_mcast);
#endif /* UVERBS_H */

1006
drivers/infiniband/core/uverbs_cmd.c Normal file
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698
drivers/infiniband/core/uverbs_main.c Normal file
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/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Cisco Systems. 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 <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)
DECLARE_MUTEX(ib_uverbs_idr_mutex);
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);
static spinlock_t map_lock;
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_QUERY_PARAMS] = ib_uverbs_query_params,
[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_QUERY_GID] = ib_uverbs_query_gid,
[IB_USER_VERBS_CMD_QUERY_PKEY] = ib_uverbs_query_pkey,
[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_CQ] = ib_uverbs_create_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_MODIFY_QP] = ib_uverbs_modify_qp,
[IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
[IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
[IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
};
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 int ib_dealloc_ucontext(struct ib_ucontext *context)
{
struct ib_uobject *uobj, *tmp;
if (!context)
return 0;
down(&ib_uverbs_idr_mutex);
/* XXX Free AHs */
list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
idr_remove(&ib_uverbs_qp_idr, uobj->id);
ib_destroy_qp(qp);
list_del(&uobj->list);
kfree(uobj);
}
list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
idr_remove(&ib_uverbs_cq_idr, uobj->id);
ib_destroy_cq(cq);
list_del(&uobj->list);
kfree(uobj);
}
/* XXX Free SRQs */
/* XXX Free MWs */
list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
struct ib_umem_object *memobj;
idr_remove(&ib_uverbs_mr_idr, uobj->id);
ib_dereg_mr(mr);
memobj = container_of(uobj, struct ib_umem_object, uobject);
ib_umem_release_on_close(mr->device, &memobj->umem);
list_del(&uobj->list);
kfree(memobj);
}
list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
idr_remove(&ib_uverbs_pd_idr, uobj->id);
ib_dealloc_pd(pd);
list_del(&uobj->list);
kfree(uobj);
}
up(&ib_uverbs_idr_mutex);
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);
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;
void *event;
int eventsz;
int ret = 0;
spin_lock_irq(&file->lock);
while (list_empty(&file->event_list) && file->fd >= 0) {
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) ||
file->fd < 0))
return -ERESTARTSYS;
spin_lock_irq(&file->lock);
}
if (file->fd < 0) {
spin_unlock_irq(&file->lock);
return -ENODEV;
}
if (file->is_async) {
event = list_entry(file->event_list.next,
struct ib_uverbs_async_event, list);
eventsz = sizeof (struct ib_uverbs_async_event_desc);
} else {
event = list_entry(file->event_list.next,
struct ib_uverbs_comp_event, list);
eventsz = sizeof (struct ib_uverbs_comp_event_desc);
}
if (eventsz > count) {
ret = -EINVAL;
event = NULL;
} else
list_del(file->event_list.next);
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 (file->fd < 0)
pollflags = POLLERR;
else if (!list_empty(&file->event_list))
pollflags = POLLIN | POLLRDNORM;
spin_unlock_irq(&file->lock);
return pollflags;
}
static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
{
struct list_head *entry, *tmp;
spin_lock_irq(&file->lock);
if (file->fd != -1) {
file->fd = -1;
list_for_each_safe(entry, tmp, &file->event_list)
if (file->is_async)
kfree(list_entry(entry, struct ib_uverbs_async_event, list));
else
kfree(list_entry(entry, struct ib_uverbs_comp_event, list));
}
spin_unlock_irq(&file->lock);
}
static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_event_file *file = filp->private_data;
ib_uverbs_event_release(file);
kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
return 0;
}
static struct file_operations uverbs_event_fops = {
/*
* No .owner field since we artificially create event files,
* so there is no increment to the module reference count in
* the open path. All event files come from a uverbs command
* file, which already takes a module reference, so this is OK.
*/
.read = ib_uverbs_event_read,
.poll = ib_uverbs_event_poll,
.release = ib_uverbs_event_close
};
void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
{
struct ib_uverbs_file *file = cq_context;
struct ib_uverbs_comp_event *entry;
unsigned long flags;
entry = kmalloc(sizeof *entry, GFP_ATOMIC);
if (!entry)
return;
entry->desc.cq_handle = cq->uobject->user_handle;
spin_lock_irqsave(&file->comp_file[0].lock, flags);
list_add_tail(&entry->list, &file->comp_file[0].event_list);
spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
wake_up_interruptible(&file->comp_file[0].poll_wait);
}
static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
__u64 element, __u64 event)
{
struct ib_uverbs_async_event *entry;
unsigned long flags;
entry = kmalloc(sizeof *entry, GFP_ATOMIC);
if (!entry)
return;
entry->desc.element = element;
entry->desc.event_type = event;
spin_lock_irqsave(&file->async_file.lock, flags);
list_add_tail(&entry->list, &file->async_file.event_list);
spin_unlock_irqrestore(&file->async_file.lock, flags);
wake_up_interruptible(&file->async_file.poll_wait);
}
void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
{
ib_uverbs_async_handler(context_ptr,
event->element.cq->uobject->user_handle,
event->event);
}
void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
{
ib_uverbs_async_handler(context_ptr,
event->element.qp->uobject->user_handle,
event->event);
}
static 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);
}
static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
struct ib_uverbs_file *uverbs_file)
{
struct file *filp;
spin_lock_init(&file->lock);
INIT_LIST_HEAD(&file->event_list);
init_waitqueue_head(&file->poll_wait);
file->uverbs_file = uverbs_file;
file->fd = get_unused_fd();
if (file->fd < 0)
return file->fd;
filp = get_empty_filp();
if (!filp) {
put_unused_fd(file->fd);
return -ENFILE;
}
filp->f_op = &uverbs_event_fops;
filp->f_vfsmnt = mntget(uverbs_event_mnt);
filp->f_dentry = dget(uverbs_event_mnt->mnt_root);
filp->f_mapping = filp->f_dentry->d_inode->i_mapping;
filp->f_flags = O_RDONLY;
filp->f_mode = FMODE_READ;
filp->private_data = file;
fd_install(file->fd, filp);
return 0;
}
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))
return -EINVAL;
if (!file->ucontext &&
hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
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 =
container_of(inode->i_cdev, struct ib_uverbs_device, dev);
struct ib_uverbs_file *file;
int i = 0;
int ret;
if (!try_module_get(dev->ib_dev->owner))
return -ENODEV;
file = kmalloc(sizeof *file +
(dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
GFP_KERNEL);
if (!file)
return -ENOMEM;
file->device = dev;
kref_init(&file->ref);
file->ucontext = NULL;
ret = ib_uverbs_event_init(&file->async_file, file);
if (ret)
goto err;
file->async_file.is_async = 1;
kref_get(&file->ref);
for (i = 0; i < dev->num_comp; ++i) {
ret = ib_uverbs_event_init(&file->comp_file[i], file);
if (ret)
goto err_async;
kref_get(&file->ref);
file->comp_file[i].is_async = 0;
}
filp->private_data = file;
INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
ib_uverbs_event_handler);
if (ib_register_event_handler(&file->event_handler))
goto err_async;
return 0;
err_async:
while (i--)
ib_uverbs_event_release(&file->comp_file[i]);
ib_uverbs_event_release(&file->async_file);
err:
kref_put(&file->ref, ib_uverbs_release_file);
return ret;
}
static int ib_uverbs_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_file *file = filp->private_data;
int i;
ib_unregister_event_handler(&file->event_handler);
ib_uverbs_event_release(&file->async_file);
ib_dealloc_ucontext(file->ucontext);
for (i = 0; i < file->device->num_comp; ++i)
ib_uverbs_event_release(&file->comp_file[i]);
kref_put(&file->ref, ib_uverbs_release_file);
return 0;
}
static struct file_operations uverbs_fops = {
.owner = THIS_MODULE,
.write = ib_uverbs_write,
.open = ib_uverbs_open,
.release = ib_uverbs_close
};
static 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 =
container_of(class_dev, struct ib_uverbs_device, class_dev);
return sprintf(buf, "%s\n", dev->ib_dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
static void ib_uverbs_release_class_dev(struct class_device *class_dev)
{
struct ib_uverbs_device *dev =
container_of(class_dev, struct ib_uverbs_device, class_dev);
cdev_del(&dev->dev);
clear_bit(dev->devnum, dev_map);
kfree(dev);
}
static struct class uverbs_class = {
.name = "infiniband_verbs",
.release = ib_uverbs_release_class_dev
};
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 = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
if (!uverbs_dev)
return;
memset(uverbs_dev, 0, sizeof *uverbs_dev);
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 = 1;
if (device->mmap)
cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
else
cdev_init(&uverbs_dev->dev, &uverbs_fops);
uverbs_dev->dev.owner = THIS_MODULE;
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;
uverbs_dev->class_dev.class = &uverbs_class;
uverbs_dev->class_dev.dev = device->dma_device;
uverbs_dev->class_dev.devt = uverbs_dev->dev.dev;
snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
if (class_device_register(&uverbs_dev->class_dev))
goto err_cdev;
if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
goto err_class;
ib_set_client_data(device, &uverbs_client, uverbs_dev);
return;
err_class:
class_device_unregister(&uverbs_dev->class_dev);
err_cdev:
cdev_del(&uverbs_dev->dev);
clear_bit(uverbs_dev->devnum, dev_map);
err:
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_device_unregister(&uverbs_dev->class_dev);
}
static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
INFINIBANDEVENTFS_MAGIC);
}
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;
}
ret = class_register(&uverbs_class);
if (ret) {
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_unregister(&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_unregister(&uverbs_class);
unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
}
module_init(ib_uverbs_init);
module_exit(ib_uverbs_cleanup);