- 根目录:
- drivers
- infiniband
- core
- 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.
*/
#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/sched.h>
#include <linux/file.h>
#include <linux/cdev.h>
#include <linux/anon_inodes.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include "uverbs.h"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand userspace verbs access");
MODULE_LICENSE("Dual BSD/GPL");
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);
DEFINE_IDR(ib_uverbs_xrcd_idr);
DEFINE_IDR(ib_uverbs_rule_idr);
static DEFINE_SPINLOCK(map_lock);
static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
struct ib_device *ib_dev,
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_REREG_MR] = ib_uverbs_rereg_mr,
[IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
[IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw,
[IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw,
[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,
[IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd,
[IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd,
[IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq,
[IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp,
};
static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
struct ib_device *ib_dev,
struct ib_udata *ucore,
struct ib_udata *uhw) = {
[IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow,
[IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow,
[IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device,
[IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq,
[IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp,
};
static void ib_uverbs_add_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
static void ib_uverbs_release_dev(struct kobject *kobj)
{
struct ib_uverbs_device *dev =
container_of(kobj, struct ib_uverbs_device, kobj);
cleanup_srcu_struct(&dev->disassociate_srcu);
kfree(dev);
}
static struct kobj_type ib_uverbs_dev_ktype = {
.release = ib_uverbs_release_dev,
};
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;
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);
}
/* Remove MWs before QPs, in order to support type 2A MWs. */
list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
struct ib_mw *mw = uobj->object;
idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
ib_dealloc_mw(mw);
kfree(uobj);
}
list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
struct ib_flow *flow_id = uobj->object;
idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
ib_destroy_flow(flow_id);
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);
if (qp != qp->real_qp) {
ib_close_qp(qp);
} else {
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->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);
}
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->mr_list, list) {
struct ib_mr *mr = uobj->object;
idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
ib_dereg_mr(mr);
kfree(uobj);
}
mutex_lock(&file->device->xrcd_tree_mutex);
list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
struct ib_xrcd *xrcd = uobj->object;
struct ib_uxrcd_object *uxrcd =
container_of(uobj, struct ib_uxrcd_object, uobject);
idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
ib_uverbs_dealloc_xrcd(file->device, xrcd);
kfree(uxrcd);
}
mutex_unlock(&file->device->xrcd_tree_mutex);
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);
}
put_pid(context->tgid);
return context->device->dealloc_ucontext(context);
}
static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
{
complete(&dev->comp);
}
static void ib_uverbs_release_file(struct kref *ref)
{
struct ib_uverbs_file *file =
container_of(ref, struct ib_uverbs_file, ref);
struct ib_device *ib_dev;
int srcu_key;
srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
ib_dev = srcu_dereference(file->device->ib_dev,
&file->device->disassociate_srcu);
if (ib_dev && !ib_dev->disassociate_ucontext)
module_put(ib_dev->owner);
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
if (atomic_dec_and_test(&file->device->refcount))
ib_uverbs_comp_dev(file->device);
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) ||
/* The barriers built into wait_event_interruptible()
* and wake_up() guarentee this will see the null set
* without using RCU
*/
!file->uverbs_file->device->ib_dev)))
return -ERESTARTSYS;
/* If device was disassociated and no event exists set an error */
if (list_empty(&file->event_list) &&
!file->uverbs_file->device->ib_dev)
return -EIO;
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;
int closed_already = 0;
mutex_lock(&file->uverbs_file->device->lists_mutex);
spin_lock_irq(&file->lock);
closed_already = file->is_closed;
file->is_closed = 1;
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);
if (!closed_already) {
list_del(&file->list);
if (file->is_async)
ib_unregister_event_handler(&file->uverbs_file->
event_handler);
}
mutex_unlock(&file->uverbs_file->device->lists_mutex);
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,
.llseek = no_llseek,
};
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->is_closed) {
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->is_closed) {
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->desc.async.reserved = 0;
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;
/* for XRC target qp's, check that qp is live */
if (!event->element.qp->uobject || !event->element.qp->uobject->live)
return;
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);
}
void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
{
kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
file->async_file = NULL;
}
struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
struct ib_device *ib_dev,
int is_async)
{
struct ib_uverbs_event_file *ev_file;
struct file *filp;
int ret;
ev_file = kzalloc(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;
kref_get(&ev_file->uverbs_file->ref);
ev_file->async_queue = NULL;
ev_file->is_closed = 0;
filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
ev_file, O_RDONLY);
if (IS_ERR(filp))
goto err_put_refs;
mutex_lock(&uverbs_file->device->lists_mutex);
list_add_tail(&ev_file->list,
&uverbs_file->device->uverbs_events_file_list);
mutex_unlock(&uverbs_file->device->lists_mutex);
if (is_async) {
WARN_ON(uverbs_file->async_file);
uverbs_file->async_file = ev_file;
kref_get(&uverbs_file->async_file->ref);
INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
ib_dev,
ib_uverbs_event_handler);
ret = ib_register_event_handler(&uverbs_file->event_handler);
if (ret)
goto err_put_file;
/* At that point async file stuff was fully set */
ev_file->is_async = 1;
}
return filp;
err_put_file:
fput(filp);
kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
uverbs_file->async_file = NULL;
return ERR_PTR(ret);
err_put_refs:
kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
kref_put(&ev_file->ref, ib_uverbs_release_event_file);
return filp;
}
/*
* 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 fd f = fdget(fd);
if (!f.file)
return NULL;
if (f.file->f_op != &uverbs_event_fops)
goto out;
ev_file = f.file->private_data;
if (ev_file->is_async) {
ev_file = NULL;
goto out;
}
kref_get(&ev_file->ref);
out:
fdput(f);
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_device *ib_dev;
struct ib_uverbs_cmd_hdr hdr;
__u32 flags;
int srcu_key;
ssize_t ret;
if (count < sizeof hdr)
return -EINVAL;
if (copy_from_user(&hdr, buf, sizeof hdr))
return -EFAULT;
srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
ib_dev = srcu_dereference(file->device->ib_dev,
&file->device->disassociate_srcu);
if (!ib_dev) {
ret = -EIO;
goto out;
}
flags = (hdr.command &
IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
if (!flags) {
__u32 command;
if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
IB_USER_VERBS_CMD_COMMAND_MASK)) {
ret = -EINVAL;
goto out;
}
command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
!uverbs_cmd_table[command]) {
ret = -EINVAL;
goto out;
}
if (!file->ucontext &&
command != IB_USER_VERBS_CMD_GET_CONTEXT) {
ret = -EINVAL;
goto out;
}
if (!(ib_dev->uverbs_cmd_mask & (1ull << command))) {
ret = -ENOSYS;
goto out;
}
if (hdr.in_words * 4 != count) {
ret = -EINVAL;
goto out;
}
ret = uverbs_cmd_table[command](file, ib_dev,
buf + sizeof(hdr),
hdr.in_words * 4,
hdr.out_words * 4);
} else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
__u32 command;
struct ib_uverbs_ex_cmd_hdr ex_hdr;
struct ib_udata ucore;
struct ib_udata uhw;
size_t written_count = count;
if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
IB_USER_VERBS_CMD_COMMAND_MASK)) {
ret = -EINVAL;
goto out;
}
command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
!uverbs_ex_cmd_table[command]) {
ret = -ENOSYS;
goto out;
}
if (!file->ucontext) {
ret = -EINVAL;
goto out;
}
if (!(ib_dev->uverbs_ex_cmd_mask & (1ull << command))) {
ret = -ENOSYS;
goto out;
}
if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
ret = -EINVAL;
goto out;
}
if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
ret = -EFAULT;
goto out;
}
count -= sizeof(hdr) + sizeof(ex_hdr);
buf += sizeof(hdr) + sizeof(ex_hdr);
if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
ret = -EINVAL;
goto out;
}
if (ex_hdr.cmd_hdr_reserved) {
ret = -EINVAL;
goto out;
}
if (ex_hdr.response) {
if (!hdr.out_words && !ex_hdr.provider_out_words) {
ret = -EINVAL;
goto out;
}
if (!access_ok(VERIFY_WRITE,
(void __user *) (unsigned long) ex_hdr.response,
(hdr.out_words + ex_hdr.provider_out_words) * 8)) {
ret = -EFAULT;
goto out;
}
} else {
if (hdr.out_words || ex_hdr.provider_out_words) {
ret = -EINVAL;
goto out;
}
}
INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
hdr.in_words * 8, hdr.out_words * 8);
INIT_UDATA_BUF_OR_NULL(&uhw,
buf + ucore.inlen,
(unsigned long) ex_hdr.response + ucore.outlen,
ex_hdr.provider_in_words * 8,
ex_hdr.provider_out_words * 8);
ret = uverbs_ex_cmd_table[command](file,
ib_dev,
&ucore,
&uhw);
if (!ret)
ret = written_count;
} else {
ret = -ENOSYS;
}
out:
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
return ret;
}
static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct ib_uverbs_file *file = filp->private_data;
struct ib_device *ib_dev;
int ret = 0;
int srcu_key;
srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
ib_dev = srcu_dereference(file->device->ib_dev,
&file->device->disassociate_srcu);
if (!ib_dev) {
ret = -EIO;
goto out;
}
if (!file->ucontext)
ret = -ENODEV;
else
ret = ib_dev->mmap(file->ucontext, vma);
out:
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
return ret;
}
/*
* ib_uverbs_open() does not need the BKL:
*
* - the ib_uverbs_device structures are properly reference counted and
* everything else is purely local to the file being created, so
* races against other open calls are not a problem;
* - there is no ioctl method to race against;
* - the open method will either immediately run -ENXIO, or all
* required initialization will be done.
*/
static int ib_uverbs_open(struct inode *inode, struct file *filp)
{
struct ib_uverbs_device *dev;
struct ib_uverbs_file *file;
struct ib_device *ib_dev;
int ret;
int module_dependent;
int srcu_key;
dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
if (!atomic_inc_not_zero(&dev->refcount))
return -ENXIO;
srcu_key = srcu_read_lock(&dev->disassociate_srcu);
mutex_lock(&dev->lists_mutex);
ib_dev = srcu_dereference(dev->ib_dev,
&dev->disassociate_srcu);
if (!ib_dev) {
ret = -EIO;
goto err;
}
/* In case IB device supports disassociate ucontext, there is no hard
* dependency between uverbs device and its low level device.
*/
module_dependent = !(ib_dev->disassociate_ucontext);
if (module_dependent) {
if (!try_module_get(ib_dev->owner)) {
ret = -ENODEV;
goto err;
}
}
file = kzalloc(sizeof(*file), GFP_KERNEL);
if (!file) {
ret = -ENOMEM;
if (module_dependent)
goto err_module;
goto err;
}
file->device = dev;
file->ucontext = NULL;
file->async_file = NULL;
kref_init(&file->ref);
mutex_init(&file->mutex);
filp->private_data = file;
kobject_get(&dev->kobj);
list_add_tail(&file->list, &dev->uverbs_file_list);
mutex_unlock(&dev->lists_mutex);
srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
return nonseekable_open(inode, filp);
err_module:
module_put(ib_dev->owner);
err:
mutex_unlock(&dev->lists_mutex);
srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
if (atomic_dec_and_test(&dev->refcount))
ib_uverbs_comp_dev(dev);
return ret;
}
static int ib_uverbs_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_file *file = filp->private_data;
struct ib_uverbs_device *dev = file->device;
struct ib_ucontext *ucontext = NULL;
mutex_lock(&file->device->lists_mutex);
ucontext = file->ucontext;
file->ucontext = NULL;
if (!file->is_closed) {
list_del(&file->list);
file->is_closed = 1;
}
mutex_unlock(&file->device->lists_mutex);
if (ucontext)
ib_uverbs_cleanup_ucontext(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);
kobject_put(&dev->kobj);
return 0;
}
static const struct file_operations uverbs_fops = {
.owner = THIS_MODULE,
.write = ib_uverbs_write,
.open = ib_uverbs_open,
.release = ib_uverbs_close,
.llseek = no_llseek,
};
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,
.llseek = no_llseek,
};
static struct ib_client uverbs_client = {
.name = "uverbs",
.add = ib_uverbs_add_one,
.remove = ib_uverbs_remove_one
};
static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
char *buf)
{
int ret = -ENODEV;
int srcu_key;
struct ib_uverbs_device *dev = dev_get_drvdata(device);
struct ib_device *ib_dev;
if (!dev)
return -ENODEV;
srcu_key = srcu_read_lock(&dev->disassociate_srcu);
ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
if (ib_dev)
ret = sprintf(buf, "%s\n", ib_dev->name);
srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
return ret;
}
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
static ssize_t show_dev_abi_version(struct device *device,
struct device_attribute *attr, char *buf)
{
struct ib_uverbs_device *dev = dev_get_drvdata(device);
int ret = -ENODEV;
int srcu_key;
struct ib_device *ib_dev;
if (!dev)
return -ENODEV;
srcu_key = srcu_read_lock(&dev->disassociate_srcu);
ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
if (ib_dev)
ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
return ret;
}
static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
static CLASS_ATTR_STRING(abi_version, S_IRUGO,
__stringify(IB_USER_VERBS_ABI_VERSION));
static dev_t overflow_maj;
static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
/*
* If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
* requesting a new major number and doubling the number of max devices we
* support. It's stupid, but simple.
*/
static int find_overflow_devnum(void)
{
int ret;
if (!overflow_maj) {
ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
"infiniband_verbs");
if (ret) {
printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
return ret;
}
}
ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
if (ret >= IB_UVERBS_MAX_DEVICES)
return -1;
return ret;
}
static void ib_uverbs_add_one(struct ib_device *device)
{
int devnum;
dev_t base;
struct ib_uverbs_device *uverbs_dev;
int ret;
if (!device->alloc_ucontext)
return;
uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
if (!uverbs_dev)
return;
ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
if (ret) {
kfree(uverbs_dev);
return;
}
atomic_set(&uverbs_dev->refcount, 1);
init_completion(&uverbs_dev->comp);
uverbs_dev->xrcd_tree = RB_ROOT;
mutex_init(&uverbs_dev->xrcd_tree_mutex);
kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
mutex_init(&uverbs_dev->lists_mutex);
INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
spin_lock(&map_lock);
devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
if (devnum >= IB_UVERBS_MAX_DEVICES) {
spin_unlock(&map_lock);
devnum = find_overflow_devnum();
if (devnum < 0)
goto err;
spin_lock(&map_lock);
uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
base = devnum + overflow_maj;
set_bit(devnum, overflow_map);
} else {
uverbs_dev->devnum = devnum;
base = devnum + IB_UVERBS_BASE_DEV;
set_bit(devnum, dev_map);
}
spin_unlock(&map_lock);
rcu_assign_pointer(uverbs_dev->ib_dev, device);
uverbs_dev->num_comp_vectors = device->num_comp_vectors;
cdev_init(&uverbs_dev->cdev, NULL);
uverbs_dev->cdev.owner = THIS_MODULE;
uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
if (cdev_add(&uverbs_dev->cdev, base, 1))
goto err_cdev;
uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
uverbs_dev->cdev.dev, uverbs_dev,
"uverbs%d", uverbs_dev->devnum);
if (IS_ERR(uverbs_dev->dev))
goto err_cdev;
if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
goto err_class;
if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
goto err_class;
ib_set_client_data(device, &uverbs_client, uverbs_dev);
return;
err_class:
device_destroy(uverbs_class, uverbs_dev->cdev.dev);
err_cdev:
cdev_del(&uverbs_dev->cdev);
if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
clear_bit(devnum, dev_map);
else
clear_bit(devnum, overflow_map);
err:
if (atomic_dec_and_test(&uverbs_dev->refcount))
ib_uverbs_comp_dev(uverbs_dev);
wait_for_completion(&uverbs_dev->comp);
kobject_put(&uverbs_dev->kobj);
return;
}
static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
struct ib_device *ib_dev)
{
struct ib_uverbs_file *file;
struct ib_uverbs_event_file *event_file;
struct ib_event event;
/* Pending running commands to terminate */
synchronize_srcu(&uverbs_dev->disassociate_srcu);
event.event = IB_EVENT_DEVICE_FATAL;
event.element.port_num = 0;
event.device = ib_dev;
mutex_lock(&uverbs_dev->lists_mutex);
while (!list_empty(&uverbs_dev->uverbs_file_list)) {
struct ib_ucontext *ucontext;
file = list_first_entry(&uverbs_dev->uverbs_file_list,
struct ib_uverbs_file, list);
file->is_closed = 1;
ucontext = file->ucontext;
list_del(&file->list);
file->ucontext = NULL;
kref_get(&file->ref);
mutex_unlock(&uverbs_dev->lists_mutex);
/* We must release the mutex before going ahead and calling
* disassociate_ucontext. disassociate_ucontext might end up
* indirectly calling uverbs_close, for example due to freeing
* the resources (e.g mmput).
*/
ib_uverbs_event_handler(&file->event_handler, &event);
if (ucontext) {
ib_dev->disassociate_ucontext(ucontext);
ib_uverbs_cleanup_ucontext(file, ucontext);
}
mutex_lock(&uverbs_dev->lists_mutex);
kref_put(&file->ref, ib_uverbs_release_file);
}
while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
event_file = list_first_entry(&uverbs_dev->
uverbs_events_file_list,
struct ib_uverbs_event_file,
list);
spin_lock_irq(&event_file->lock);
event_file->is_closed = 1;
spin_unlock_irq(&event_file->lock);
list_del(&event_file->list);
if (event_file->is_async) {
ib_unregister_event_handler(&event_file->uverbs_file->
event_handler);
event_file->uverbs_file->event_handler.device = NULL;
}
wake_up_interruptible(&event_file->poll_wait);
kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
}
mutex_unlock(&uverbs_dev->lists_mutex);
}
static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
{
struct ib_uverbs_device *uverbs_dev = client_data;
int wait_clients = 1;
if (!uverbs_dev)
return;
dev_set_drvdata(uverbs_dev->dev, NULL);
device_destroy(uverbs_class, uverbs_dev->cdev.dev);
cdev_del(&uverbs_dev->cdev);
if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
clear_bit(uverbs_dev->devnum, dev_map);
else
clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
if (device->disassociate_ucontext) {
/* We disassociate HW resources and immediately return.
* Userspace will see a EIO errno for all future access.
* Upon returning, ib_device may be freed internally and is not
* valid any more.
* uverbs_device is still available until all clients close
* their files, then the uverbs device ref count will be zero
* and its resources will be freed.
* Note: At this point no more files can be opened since the
* cdev was deleted, however active clients can still issue
* commands and close their open files.
*/
rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
ib_uverbs_free_hw_resources(uverbs_dev, device);
wait_clients = 0;
}
if (atomic_dec_and_test(&uverbs_dev->refcount))
ib_uverbs_comp_dev(uverbs_dev);
if (wait_clients)
wait_for_completion(&uverbs_dev->comp);
kobject_put(&uverbs_dev->kobj);
}
static char *uverbs_devnode(struct device *dev, umode_t *mode)
{
if (mode)
*mode = 0666;
return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
}
static int __init ib_uverbs_init(void)
{
int ret;
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;
}
uverbs_class->devnode = uverbs_devnode;
ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
if (ret) {
printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
goto out_class;
}
ret = ib_register_client(&uverbs_client);
if (ret) {
printk(KERN_ERR "user_verbs: couldn't register client\n");
goto out_class;
}
return 0;
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);
class_destroy(uverbs_class);
unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
if (overflow_maj)
unregister_chrdev_region(overflow_maj, 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);