diff options
Diffstat (limited to 'drivers/infiniband/core/uverbs_main.c')
| -rw-r--r-- | drivers/infiniband/core/uverbs_main.c | 1261 |
1 files changed, 1261 insertions, 0 deletions
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c new file mode 100644 index 000000000..fc4b46258 --- /dev/null +++ b/drivers/infiniband/core/uverbs_main.c @@ -0,0 +1,1261 @@ +/* + * 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 = RDMA_MAX_PORTS, + IB_UVERBS_NUM_FIXED_MINOR = 32, + IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR, +}; + +#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) + +static dev_t dynamic_uverbs_dev; +static struct class *uverbs_class; + +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_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_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); + +/* + * Must be called with the ufile->device->disassociate_srcu held, and the lock + * must be held until use of the ucontext is finished. + */ +struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile) +{ + /* + * We do not hold the hw_destroy_rwsem lock for this flow, instead + * srcu is used. It does not matter if someone races this with + * get_context, we get NULL or valid ucontext. + */ + struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext); + + if (!srcu_dereference(ufile->device->ib_dev, + &ufile->device->disassociate_srcu)) + return ERR_PTR(-EIO); + + if (!ucontext) + return ERR_PTR(-EINVAL); + + return ucontext; +} +EXPORT_SYMBOL(ib_uverbs_get_ucontext); + +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); + + uverbs_destroy_api(dev->uapi); + 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); + } + + 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 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; + + release_ufile_idr_uobject(file); + + 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); + + if (file->async_file) + kref_put(&file->async_file->ref, + ib_uverbs_release_async_event_file); + kobject_put(&file->device->kobj); + kfree(file); +} + +static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, + 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) || + ev_queue->is_closed))) + return -ERESTARTSYS; + + spin_lock_irq(&ev_queue->lock); + + /* If device was disassociated and no event exists set an error */ + if (list_empty(&ev_queue->event_list) && ev_queue->is_closed) { + spin_unlock_irq(&ev_queue->lock); + return -EIO; + } + } + + 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, 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, filp, buf, count, + pos, + sizeof(struct ib_uverbs_comp_event_desc)); +} + +static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, + struct file *filp, + struct poll_table_struct *wait) +{ + __poll_t pollflags = 0; + + poll_wait(filp, &ev_queue->poll_wait, wait); + + spin_lock_irq(&ev_queue->lock); + if (!list_empty(&ev_queue->event_list)) + pollflags = EPOLLIN | EPOLLRDNORM; + else if (ev_queue->is_closed) + pollflags = EPOLLERR; + spin_unlock_irq(&ev_queue->lock); + + return pollflags; +} + +static __poll_t ib_uverbs_async_event_poll(struct file *filp, + struct poll_table_struct *wait) +{ + struct ib_uverbs_async_event_file *file = filp->private_data; + + return ib_uverbs_event_poll(&file->ev_queue, filp, wait); +} + +static __poll_t 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_async_event_file *file = filp->private_data; + + return fasync_helper(fd, filp, on, &file->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_uobject *uobj = filp->private_data; + struct ib_uverbs_completion_event_file *file = container_of( + uobj, struct ib_uverbs_completion_event_file, uobj); + 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); + } + file->ev_queue.is_closed = 1; + 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->uobject.ufile, 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 bool verify_command_mask(struct ib_uverbs_file *ufile, u32 command, + bool extended) +{ + if (!extended) + return ufile->uverbs_cmd_mask & BIT_ULL(command); + + return ufile->uverbs_ex_cmd_mask & BIT_ULL(command); +} + +static bool verify_command_idx(u32 command, bool extended) +{ + if (extended) + return command < ARRAY_SIZE(uverbs_ex_cmd_table) && + uverbs_ex_cmd_table[command]; + + return command < ARRAY_SIZE(uverbs_cmd_table) && + uverbs_cmd_table[command]; +} + +static ssize_t process_hdr(struct ib_uverbs_cmd_hdr *hdr, + u32 *command, bool *extended) +{ + if (hdr->command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED | + IB_USER_VERBS_CMD_COMMAND_MASK)) + return -EINVAL; + + *command = hdr->command & IB_USER_VERBS_CMD_COMMAND_MASK; + *extended = hdr->command & IB_USER_VERBS_CMD_FLAG_EXTENDED; + + if (!verify_command_idx(*command, *extended)) + return -EOPNOTSUPP; + + return 0; +} + +static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr, + struct ib_uverbs_ex_cmd_hdr *ex_hdr, + size_t count, bool extended) +{ + if (extended) { + count -= sizeof(*hdr) + sizeof(*ex_hdr); + + if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count) + return -EINVAL; + + if (ex_hdr->cmd_hdr_reserved) + return -EINVAL; + + if (ex_hdr->response) { + if (!hdr->out_words && !ex_hdr->provider_out_words) + return -EINVAL; + + if (!access_ok(VERIFY_WRITE, + u64_to_user_ptr(ex_hdr->response), + (hdr->out_words + ex_hdr->provider_out_words) * 8)) + return -EFAULT; + } else { + if (hdr->out_words || ex_hdr->provider_out_words) + return -EINVAL; + } + + return 0; + } + + /* not extended command */ + if (hdr->in_words * 4 != count) + return -EINVAL; + + return 0; +} + +static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, + size_t count, loff_t *pos) +{ + struct ib_uverbs_file *file = filp->private_data; + struct ib_uverbs_ex_cmd_hdr ex_hdr; + struct ib_uverbs_cmd_hdr hdr; + bool extended; + int srcu_key; + u32 command; + 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; + + ret = process_hdr(&hdr, &command, &extended); + if (ret) + return ret; + + if (extended) { + if (count < (sizeof(hdr) + sizeof(ex_hdr))) + return -EINVAL; + if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) + return -EFAULT; + } + + ret = verify_hdr(&hdr, &ex_hdr, count, extended); + if (ret) + return ret; + + srcu_key = srcu_read_lock(&file->device->disassociate_srcu); + + if (!verify_command_mask(file, command, extended)) { + ret = -EOPNOTSUPP; + goto out; + } + + buf += sizeof(hdr); + + if (!extended) { + ret = uverbs_cmd_table[command](file, buf, + hdr.in_words * 4, + hdr.out_words * 4); + } else { + struct ib_udata ucore; + struct ib_udata uhw; + + buf += sizeof(ex_hdr); + + 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, &ucore, &uhw); + ret = (ret) ? : count; + } + +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_ucontext *ucontext; + int ret = 0; + int srcu_key; + + srcu_key = srcu_read_lock(&file->device->disassociate_srcu); + ucontext = ib_uverbs_get_ucontext(file); + if (IS_ERR(ucontext)) { + ret = PTR_ERR(ucontext); + goto out; + } + + ret = ucontext->device->mmap(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; + kref_init(&file->ref); + mutex_init(&file->ucontext_lock); + + spin_lock_init(&file->uobjects_lock); + INIT_LIST_HEAD(&file->uobjects); + init_rwsem(&file->hw_destroy_rwsem); + + 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); + + file->uverbs_cmd_mask = ib_dev->uverbs_cmd_mask; + file->uverbs_ex_cmd_mask = ib_dev->uverbs_ex_cmd_mask; + + setup_ufile_idr_uobject(file); + + 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; + + uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE); + + mutex_lock(&file->device->lists_mutex); + if (!file->is_closed) { + list_del(&file->list); + file->is_closed = 1; + } + mutex_unlock(&file->device->lists_mutex); + + 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, + .unlocked_ioctl = ib_uverbs_ioctl, + .compat_ioctl = ib_uverbs_ioctl, +}; + +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, + .unlocked_ioctl = ib_uverbs_ioctl, + .compat_ioctl = ib_uverbs_ioctl, +}; + +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 int ib_uverbs_create_uapi(struct ib_device *device, + struct ib_uverbs_device *uverbs_dev) +{ + struct uverbs_api *uapi; + + uapi = uverbs_alloc_api(device->driver_specs, device->driver_id); + if (IS_ERR(uapi)) + return PTR_ERR(uapi); + + uverbs_dev->uapi = uapi; + return 0; +} + +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); + + devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); + if (devnum >= IB_UVERBS_MAX_DEVICES) + goto err; + uverbs_dev->devnum = devnum; + set_bit(devnum, dev_map); + if (devnum >= IB_UVERBS_NUM_FIXED_MINOR) + base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR; + else + base = IB_UVERBS_BASE_DEV + devnum; + + rcu_assign_pointer(uverbs_dev->ib_dev, device); + uverbs_dev->num_comp_vectors = device->num_comp_vectors; + + if (ib_uverbs_create_uapi(device, uverbs_dev)) + goto err_uapi; + + 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; + + 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); +err_uapi: + clear_bit(devnum, dev_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 */ + uverbs_disassociate_api_pre(uverbs_dev); + 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)) { + 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); + + /* We must release the mutex before going ahead and calling + * uverbs_cleanup_ufile, as it might end up indirectly calling + * uverbs_close, for example due to freeing the resources (e.g + * mmput). + */ + mutex_unlock(&uverbs_dev->lists_mutex); + + ib_uverbs_event_handler(&file->event_handler, &event); + uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE); + kref_put(&file->ref, ib_uverbs_release_file); + + mutex_lock(&uverbs_dev->lists_mutex); + } + + 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); + + uverbs_disassociate_api(uverbs_dev->uapi); +} + +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); + clear_bit(uverbs_dev->devnum, dev_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. + */ + 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_NUM_FIXED_MINOR, + "infiniband_verbs"); + if (ret) { + pr_err("user_verbs: couldn't register device number\n"); + goto out; + } + + ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0, + IB_UVERBS_NUM_DYNAMIC_MINOR, + "infiniband_verbs"); + if (ret) { + pr_err("couldn't register dynamic device number\n"); + goto out_alloc; + } + + 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(dynamic_uverbs_dev, + IB_UVERBS_NUM_DYNAMIC_MINOR); + +out_alloc: + unregister_chrdev_region(IB_UVERBS_BASE_DEV, + IB_UVERBS_NUM_FIXED_MINOR); + +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_NUM_FIXED_MINOR); + unregister_chrdev_region(dynamic_uverbs_dev, + IB_UVERBS_NUM_DYNAMIC_MINOR); +} + +module_init(ib_uverbs_init); +module_exit(ib_uverbs_cleanup); |