| /* |
| * 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 <linux/uaccess.h> |
| |
| #include <rdma/ib.h> |
| #include <rdma/uverbs_std_types.h> |
| |
| #include "uverbs.h" |
| #include "core_priv.h" |
| #include "rdma_core.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; |
| |
| 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, |
| [IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq, |
| [IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq, |
| [IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq, |
| [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table, |
| [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table, |
| [IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp, |
| [IB_USER_VERBS_EX_CMD_MODIFY_CQ] = ib_uverbs_ex_modify_cq, |
| }; |
| |
| static void ib_uverbs_add_one(struct ib_device *device); |
| static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); |
| |
| int uverbs_dealloc_mw(struct ib_mw *mw) |
| { |
| struct ib_pd *pd = mw->pd; |
| int ret; |
| |
| ret = mw->device->dealloc_mw(mw); |
| if (!ret) |
| atomic_dec(&pd->usecnt); |
| return ret; |
| } |
| |
| 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_async_event_file(struct kref *ref) |
| { |
| struct ib_uverbs_async_event_file *file = |
| container_of(ref, struct ib_uverbs_async_event_file, ref); |
| |
| kfree(file); |
| } |
| |
| void ib_uverbs_release_ucq(struct ib_uverbs_file *file, |
| struct ib_uverbs_completion_event_file *ev_file, |
| struct ib_ucq_object *uobj) |
| { |
| struct ib_uverbs_event *evt, *tmp; |
| |
| if (ev_file) { |
| spin_lock_irq(&ev_file->ev_queue.lock); |
| list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { |
| list_del(&evt->list); |
| kfree(evt); |
| } |
| spin_unlock_irq(&ev_file->ev_queue.lock); |
| |
| uverbs_uobject_put(&ev_file->uobj_file.uobj); |
| } |
| |
| spin_lock_irq(&file->async_file->ev_queue.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->ev_queue.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->ev_queue.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->ev_queue.lock); |
| } |
| |
| 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, |
| bool device_removed) |
| { |
| context->closing = 1; |
| uverbs_cleanup_ucontext(context, device_removed); |
| put_pid(context->tgid); |
| |
| ib_rdmacg_uncharge(&context->cg_obj, context->device, |
| RDMACG_RESOURCE_HCA_HANDLE); |
| |
| return context->device->dealloc_ucontext(context); |
| } |
| |
| static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) |
| { |
| complete(&dev->comp); |
| } |
| |
| 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); |
| |
| kobject_put(&file->device->kobj); |
| kfree(file); |
| } |
| |
| static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, |
| struct ib_uverbs_file *uverbs_file, |
| struct file *filp, char __user *buf, |
| size_t count, loff_t *pos, |
| size_t eventsz) |
| { |
| struct ib_uverbs_event *event; |
| int ret = 0; |
| |
| spin_lock_irq(&ev_queue->lock); |
| |
| while (list_empty(&ev_queue->event_list)) { |
| spin_unlock_irq(&ev_queue->lock); |
| |
| if (filp->f_flags & O_NONBLOCK) |
| return -EAGAIN; |
| |
| if (wait_event_interruptible(ev_queue->poll_wait, |
| (!list_empty(&ev_queue->event_list) || |
| /* The barriers built into wait_event_interruptible() |
| * and wake_up() guarentee this will see the null set |
| * without using RCU |
| */ |
| !uverbs_file->device->ib_dev))) |
| return -ERESTARTSYS; |
| |
| /* If device was disassociated and no event exists set an error */ |
| if (list_empty(&ev_queue->event_list) && |
| !uverbs_file->device->ib_dev) |
| return -EIO; |
| |
| spin_lock_irq(&ev_queue->lock); |
| } |
| |
| event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); |
| |
| if (eventsz > count) { |
| ret = -EINVAL; |
| event = NULL; |
| } else { |
| list_del(ev_queue->event_list.next); |
| if (event->counter) { |
| ++(*event->counter); |
| list_del(&event->obj_list); |
| } |
| } |
| |
| spin_unlock_irq(&ev_queue->lock); |
| |
| if (event) { |
| if (copy_to_user(buf, event, eventsz)) |
| ret = -EFAULT; |
| else |
| ret = eventsz; |
| } |
| |
| kfree(event); |
| |
| return ret; |
| } |
| |
| static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, |
| size_t count, loff_t *pos) |
| { |
| struct ib_uverbs_async_event_file *file = filp->private_data; |
| |
| return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp, |
| buf, count, pos, |
| sizeof(struct ib_uverbs_async_event_desc)); |
| } |
| |
| static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, |
| size_t count, loff_t *pos) |
| { |
| struct ib_uverbs_completion_event_file *comp_ev_file = |
| filp->private_data; |
| |
| return ib_uverbs_event_read(&comp_ev_file->ev_queue, |
| comp_ev_file->uobj_file.ufile, filp, |
| buf, count, pos, |
| sizeof(struct ib_uverbs_comp_event_desc)); |
| } |
| |
| static unsigned int ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, |
| struct file *filp, |
| struct poll_table_struct *wait) |
| { |
| unsigned int pollflags = 0; |
| |
| poll_wait(filp, &ev_queue->poll_wait, wait); |
| |
| spin_lock_irq(&ev_queue->lock); |
| if (!list_empty(&ev_queue->event_list)) |
| pollflags = POLLIN | POLLRDNORM; |
| spin_unlock_irq(&ev_queue->lock); |
| |
| return pollflags; |
| } |
| |
| static unsigned int ib_uverbs_async_event_poll(struct file *filp, |
| struct poll_table_struct *wait) |
| { |
| return ib_uverbs_event_poll(filp->private_data, filp, wait); |
| } |
| |
| static unsigned int ib_uverbs_comp_event_poll(struct file *filp, |
| struct poll_table_struct *wait) |
| { |
| struct ib_uverbs_completion_event_file *comp_ev_file = |
| filp->private_data; |
| |
| return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); |
| } |
| |
| static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) |
| { |
| struct ib_uverbs_event_queue *ev_queue = filp->private_data; |
| |
| return fasync_helper(fd, filp, on, &ev_queue->async_queue); |
| } |
| |
| static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) |
| { |
| struct ib_uverbs_completion_event_file *comp_ev_file = |
| filp->private_data; |
| |
| return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); |
| } |
| |
| static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp) |
| { |
| struct ib_uverbs_async_event_file *file = filp->private_data; |
| struct ib_uverbs_file *uverbs_file = file->uverbs_file; |
| struct ib_uverbs_event *entry, *tmp; |
| int closed_already = 0; |
| |
| mutex_lock(&uverbs_file->device->lists_mutex); |
| spin_lock_irq(&file->ev_queue.lock); |
| closed_already = file->ev_queue.is_closed; |
| file->ev_queue.is_closed = 1; |
| list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { |
| if (entry->counter) |
| list_del(&entry->obj_list); |
| kfree(entry); |
| } |
| spin_unlock_irq(&file->ev_queue.lock); |
| if (!closed_already) { |
| list_del(&file->list); |
| ib_unregister_event_handler(&uverbs_file->event_handler); |
| } |
| mutex_unlock(&uverbs_file->device->lists_mutex); |
| |
| kref_put(&uverbs_file->ref, ib_uverbs_release_file); |
| kref_put(&file->ref, ib_uverbs_release_async_event_file); |
| |
| return 0; |
| } |
| |
| static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp) |
| { |
| struct ib_uverbs_completion_event_file *file = filp->private_data; |
| struct ib_uverbs_event *entry, *tmp; |
| |
| spin_lock_irq(&file->ev_queue.lock); |
| list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { |
| if (entry->counter) |
| list_del(&entry->obj_list); |
| kfree(entry); |
| } |
| spin_unlock_irq(&file->ev_queue.lock); |
| |
| uverbs_close_fd(filp); |
| |
| return 0; |
| } |
| |
| const struct file_operations uverbs_event_fops = { |
| .owner = THIS_MODULE, |
| .read = ib_uverbs_comp_event_read, |
| .poll = ib_uverbs_comp_event_poll, |
| .release = ib_uverbs_comp_event_close, |
| .fasync = ib_uverbs_comp_event_fasync, |
| .llseek = no_llseek, |
| }; |
| |
| static const struct file_operations uverbs_async_event_fops = { |
| .owner = THIS_MODULE, |
| .read = ib_uverbs_async_event_read, |
| .poll = ib_uverbs_async_event_poll, |
| .release = ib_uverbs_async_event_close, |
| .fasync = ib_uverbs_async_event_fasync, |
| .llseek = no_llseek, |
| }; |
| |
| void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) |
| { |
| struct ib_uverbs_event_queue *ev_queue = cq_context; |
| struct ib_ucq_object *uobj; |
| struct ib_uverbs_event *entry; |
| unsigned long flags; |
| |
| if (!ev_queue) |
| return; |
| |
| spin_lock_irqsave(&ev_queue->lock, flags); |
| if (ev_queue->is_closed) { |
| spin_unlock_irqrestore(&ev_queue->lock, flags); |
| return; |
| } |
| |
| entry = kmalloc(sizeof *entry, GFP_ATOMIC); |
| if (!entry) { |
| spin_unlock_irqrestore(&ev_queue->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, &ev_queue->event_list); |
| list_add_tail(&entry->obj_list, &uobj->comp_list); |
| spin_unlock_irqrestore(&ev_queue->lock, flags); |
| |
| wake_up_interruptible(&ev_queue->poll_wait); |
| kill_fasync(&ev_queue->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->ev_queue.lock, flags); |
| if (file->async_file->ev_queue.is_closed) { |
| spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); |
| return; |
| } |
| |
| entry = kmalloc(sizeof *entry, GFP_ATOMIC); |
| if (!entry) { |
| spin_unlock_irqrestore(&file->async_file->ev_queue.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->ev_queue.event_list); |
| if (obj_list) |
| list_add_tail(&entry->obj_list, obj_list); |
| spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); |
| |
| wake_up_interruptible(&file->async_file->ev_queue.poll_wait); |
| kill_fasync(&file->async_file->ev_queue.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) |
| 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_wq_event_handler(struct ib_event *event, void *context_ptr) |
| { |
| struct ib_uevent_object *uobj = container_of(event->element.wq->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_async_event_file); |
| file->async_file = NULL; |
| } |
| |
| void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) |
| { |
| spin_lock_init(&ev_queue->lock); |
| INIT_LIST_HEAD(&ev_queue->event_list); |
| init_waitqueue_head(&ev_queue->poll_wait); |
| ev_queue->is_closed = 0; |
| ev_queue->async_queue = NULL; |
| } |
| |
| struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file, |
| struct ib_device *ib_dev) |
| { |
| struct ib_uverbs_async_event_file *ev_file; |
| struct file *filp; |
| |
| ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); |
| if (!ev_file) |
| return ERR_PTR(-ENOMEM); |
| |
| ib_uverbs_init_event_queue(&ev_file->ev_queue); |
| ev_file->uverbs_file = uverbs_file; |
| kref_get(&ev_file->uverbs_file->ref); |
| kref_init(&ev_file->ref); |
| filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_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); |
| |
| 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); |
| ib_register_event_handler(&uverbs_file->event_handler); |
| /* At that point async file stuff was fully set */ |
| |
| return filp; |
| |
| err_put_refs: |
| kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); |
| kref_put(&ev_file->ref, ib_uverbs_release_async_event_file); |
| return filp; |
| } |
| |
| static int verify_command_mask(struct ib_device *ib_dev, __u32 command) |
| { |
| u64 mask; |
| |
| if (command <= IB_USER_VERBS_CMD_OPEN_QP) |
| mask = ib_dev->uverbs_cmd_mask; |
| else |
| mask = ib_dev->uverbs_ex_cmd_mask; |
| |
| if (mask & ((u64)1 << command)) |
| return 0; |
| |
| return -1; |
| } |
| |
| 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 command; |
| __u32 flags; |
| int srcu_key; |
| ssize_t ret; |
| |
| if (!ib_safe_file_access(filp)) { |
| pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", |
| task_tgid_vnr(current), current->comm); |
| return -EACCES; |
| } |
| |
| 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; |
| } |
| |
| 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 (verify_command_mask(ib_dev, command)) { |
| ret = -EOPNOTSUPP; |
| goto out; |
| } |
| |
| if (!file->ucontext && |
| command != IB_USER_VERBS_CMD_GET_CONTEXT) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| flags = (hdr.command & |
| IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; |
| |
| if (!flags) { |
| if (command >= ARRAY_SIZE(uverbs_cmd_table) || |
| !uverbs_cmd_table[command]) { |
| ret = -EINVAL; |
| 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) { |
| struct ib_uverbs_ex_cmd_hdr ex_hdr; |
| struct ib_udata ucore; |
| struct ib_udata uhw; |
| size_t written_count = count; |
| |
| 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 (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, |
| u64_to_user_ptr(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; |
| } |
| } |
| |
| ib_uverbs_init_udata_buf_or_null(&ucore, buf, |
| u64_to_user_ptr(ex_hdr.response), |
| hdr.in_words * 8, hdr.out_words * 8); |
| |
| ib_uverbs_init_udata_buf_or_null(&uhw, |
| buf + ucore.inlen, |
| u64_to_user_ptr(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; |
| spin_lock_init(&file->idr_lock); |
| idr_init(&file->idr); |
| file->ucontext = NULL; |
| file->async_file = NULL; |
| kref_init(&file->ref); |
| mutex_init(&file->mutex); |
| mutex_init(&file->cleanup_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; |
| |
| mutex_lock(&file->cleanup_mutex); |
| if (file->ucontext) { |
| ib_uverbs_cleanup_ucontext(file, file->ucontext, false); |
| file->ucontext = NULL; |
| } |
| mutex_unlock(&file->cleanup_mutex); |
| idr_destroy(&file->idr); |
| |
| mutex_lock(&file->device->lists_mutex); |
| if (!file->is_closed) { |
| list_del(&file->list); |
| file->is_closed = 1; |
| } |
| mutex_unlock(&file->device->lists_mutex); |
| |
| if (file->async_file) |
| kref_put(&file->async_file->ref, |
| ib_uverbs_release_async_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, |
| #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS) |
| .unlocked_ioctl = ib_uverbs_ioctl, |
| #endif |
| }; |
| |
| 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, |
| #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS) |
| .unlocked_ioctl = ib_uverbs_ioctl, |
| #endif |
| }; |
| |
| 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) { |
| pr_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; |
| cdev_set_parent(&uverbs_dev->cdev, &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->dev.parent, |
| 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; |
| |
| if (!device->specs_root) { |
| const struct uverbs_object_tree_def *default_root[] = { |
| uverbs_default_get_objects()}; |
| |
| uverbs_dev->specs_root = uverbs_alloc_spec_tree(1, |
| default_root); |
| if (IS_ERR(uverbs_dev->specs_root)) |
| goto err_class; |
| |
| device->specs_root = uverbs_dev->specs_root; |
| } |
| |
| 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_async_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; |
| list_del(&file->list); |
| kref_get(&file->ref); |
| mutex_unlock(&uverbs_dev->lists_mutex); |
| |
| |
| mutex_lock(&file->cleanup_mutex); |
| ucontext = file->ucontext; |
| file->ucontext = NULL; |
| mutex_unlock(&file->cleanup_mutex); |
| |
| /* At this point ib_uverbs_close cannot be running |
| * ib_uverbs_cleanup_ucontext |
| */ |
| if (ucontext) { |
| /* 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); |
| ib_dev->disassociate_ucontext(ucontext); |
| mutex_lock(&file->cleanup_mutex); |
| ib_uverbs_cleanup_ucontext(file, ucontext, true); |
| mutex_unlock(&file->cleanup_mutex); |
| } |
| |
| 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_async_event_file, |
| list); |
| spin_lock_irq(&event_file->ev_queue.lock); |
| event_file->ev_queue.is_closed = 1; |
| spin_unlock_irq(&event_file->ev_queue.lock); |
| |
| list_del(&event_file->list); |
| ib_unregister_event_handler( |
| &event_file->uverbs_file->event_handler); |
| event_file->uverbs_file->event_handler.device = |
| NULL; |
| |
| wake_up_interruptible(&event_file->ev_queue.poll_wait); |
| kill_fasync(&event_file->ev_queue.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); |
| if (uverbs_dev->specs_root) { |
| uverbs_free_spec_tree(uverbs_dev->specs_root); |
| device->specs_root = NULL; |
| } |
| |
| 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) { |
| pr_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); |
| pr_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) { |
| pr_err("user_verbs: couldn't create abi_version attribute\n"); |
| goto out_class; |
| } |
| |
| ret = ib_register_client(&uverbs_client); |
| if (ret) { |
| pr_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); |
| } |
| |
| module_init(ib_uverbs_init); |
| module_exit(ib_uverbs_cleanup); |