![Al Viro](/assets/img/avatar_default.png)
both callers of device_get_devnode() are only interested in lower 16bits and nobody tries to return anything wider than 16bit anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
918 lines
24 KiB
C
918 lines
24 KiB
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);
|
|
|
|
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,
|
|
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,
|
|
[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 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);
|
|
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->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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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->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 (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,
|
|
.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->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)
|
|
{
|
|
struct ib_uverbs_event_file *ev_file;
|
|
struct file *filp;
|
|
|
|
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;
|
|
ev_file->is_closed = 0;
|
|
|
|
filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
|
|
ev_file, O_RDONLY);
|
|
if (IS_ERR(filp))
|
|
kfree(ev_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 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 >= ARRAY_SIZE(uverbs_cmd_table) ||
|
|
!uverbs_cmd_table[hdr.command])
|
|
return -EINVAL;
|
|
|
|
if (!file->ucontext &&
|
|
hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
|
|
return -EINVAL;
|
|
|
|
if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
|
|
return -ENOSYS;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int ret;
|
|
|
|
dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
|
|
if (dev)
|
|
kref_get(&dev->ref);
|
|
else
|
|
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 nonseekable_open(inode, filp);
|
|
|
|
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,
|
|
.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)
|
|
{
|
|
struct ib_uverbs_device *dev = dev_get_drvdata(device);
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
return sprintf(buf, "%s\n", dev->ib_dev->name);
|
|
}
|
|
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);
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
|
|
}
|
|
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;
|
|
|
|
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);
|
|
uverbs_dev->xrcd_tree = RB_ROOT;
|
|
mutex_init(&uverbs_dev->xrcd_tree_mutex);
|
|
|
|
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);
|
|
|
|
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;
|
|
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:
|
|
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;
|
|
|
|
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);
|
|
|
|
kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
|
|
wait_for_completion(&uverbs_dev->comp);
|
|
kfree(uverbs_dev);
|
|
}
|
|
|
|
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);
|