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- /*
- * 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/sched/mm.h>
- #include <linux/uaccess.h>
- #include <rdma/ib.h>
- #include <rdma/uverbs_std_types.h>
- #include <rdma/rdma_netlink.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 DEFINE_IDA(uverbs_ida);
- static int 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_file(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_file);
- int uverbs_dealloc_mw(struct ib_mw *mw)
- {
- struct ib_pd *pd = mw->pd;
- int ret;
- ret = mw->device->ops.dealloc_mw(mw);
- if (ret)
- return ret;
- atomic_dec(&pd->usecnt);
- kfree(mw);
- return ret;
- }
- static void ib_uverbs_release_dev(struct device *device)
- {
- struct ib_uverbs_device *dev =
- container_of(device, struct ib_uverbs_device, dev);
- uverbs_destroy_api(dev->uapi);
- cleanup_srcu_struct(&dev->disassociate_srcu);
- mutex_destroy(&dev->lists_mutex);
- mutex_destroy(&dev->xrcd_tree_mutex);
- kfree(dev);
- }
- void ib_uverbs_release_ucq(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);
- }
- ib_uverbs_release_uevent(&uobj->uevent);
- }
- void ib_uverbs_release_uevent(struct ib_uevent_object *uobj)
- {
- struct ib_uverbs_async_event_file *async_file = uobj->event_file;
- struct ib_uverbs_event *evt, *tmp;
- if (!async_file)
- return;
- spin_lock_irq(&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(&async_file->ev_queue.lock);
- uverbs_uobject_put(&async_file->uobj);
- }
- 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->ops.disassociate_ucontext)
- module_put(ib_dev->ops.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->default_async_file)
- uverbs_uobject_put(&file->default_async_file->uobj);
- put_device(&file->device->dev);
- if (file->disassociate_page)
- __free_pages(file->disassociate_page, 0);
- mutex_destroy(&file->umap_lock);
- mutex_destroy(&file->ucontext_lock);
- 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);
- }
- const struct file_operations uverbs_event_fops = {
- .owner = THIS_MODULE,
- .read = ib_uverbs_comp_event_read,
- .poll = ib_uverbs_comp_event_poll,
- .release = uverbs_uobject_fd_release,
- .fasync = ib_uverbs_comp_event_fasync,
- .llseek = no_llseek,
- };
- const struct file_operations uverbs_async_event_fops = {
- .owner = THIS_MODULE,
- .read = ib_uverbs_async_event_read,
- .poll = ib_uverbs_async_event_poll,
- .release = uverbs_async_event_release,
- .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 = cq->uobject;
- entry->desc.comp.cq_handle = cq->uobject->uevent.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);
- }
- void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
- __u64 element, __u64 event,
- struct list_head *obj_list, u32 *counter)
- {
- struct ib_uverbs_event *entry;
- unsigned long flags;
- if (!async_file)
- return;
- spin_lock_irqsave(&async_file->ev_queue.lock, flags);
- if (async_file->ev_queue.is_closed) {
- spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
- return;
- }
- entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
- if (!entry) {
- spin_unlock_irqrestore(&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, &async_file->ev_queue.event_list);
- if (obj_list)
- list_add_tail(&entry->obj_list, obj_list);
- spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
- wake_up_interruptible(&async_file->ev_queue.poll_wait);
- kill_fasync(&async_file->ev_queue.async_queue, SIGIO, POLL_IN);
- }
- static void uverbs_uobj_event(struct ib_uevent_object *eobj,
- struct ib_event *event)
- {
- ib_uverbs_async_handler(eobj->event_file,
- eobj->uobject.user_handle, event->event,
- &eobj->event_list, &eobj->events_reported);
- }
- void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
- {
- uverbs_uobj_event(&event->element.cq->uobject->uevent, event);
- }
- void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
- {
- /* for XRC target qp's, check that qp is live */
- if (!event->element.qp->uobject)
- return;
- uverbs_uobj_event(&event->element.qp->uobject->uevent, event);
- }
- void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
- {
- uverbs_uobj_event(&event->element.wq->uobject->uevent, event);
- }
- void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
- {
- uverbs_uobj_event(&event->element.srq->uobject->uevent, event);
- }
- static void ib_uverbs_event_handler(struct ib_event_handler *handler,
- struct ib_event *event)
- {
- ib_uverbs_async_handler(
- container_of(handler, struct ib_uverbs_async_event_file,
- event_handler),
- event->element.port_num, event->event, NULL, 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;
- }
- void ib_uverbs_init_async_event_file(
- struct ib_uverbs_async_event_file *async_file)
- {
- struct ib_uverbs_file *uverbs_file = async_file->uobj.ufile;
- struct ib_device *ib_dev = async_file->uobj.context->device;
- ib_uverbs_init_event_queue(&async_file->ev_queue);
- /* The first async_event_file becomes the default one for the file. */
- mutex_lock(&uverbs_file->ucontext_lock);
- if (!uverbs_file->default_async_file) {
- /* Pairs with the put in ib_uverbs_release_file */
- uverbs_uobject_get(&async_file->uobj);
- smp_store_release(&uverbs_file->default_async_file, async_file);
- }
- mutex_unlock(&uverbs_file->ucontext_lock);
- INIT_IB_EVENT_HANDLER(&async_file->event_handler, ib_dev,
- ib_uverbs_event_handler);
- ib_register_event_handler(&async_file->event_handler);
- }
- static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
- struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count,
- const struct uverbs_api_write_method *method_elm)
- {
- if (method_elm->is_ex) {
- count -= sizeof(*hdr) + sizeof(*ex_hdr);
- if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
- return -EINVAL;
- if (hdr->in_words * 8 < method_elm->req_size)
- return -ENOSPC;
- if (ex_hdr->cmd_hdr_reserved)
- return -EINVAL;
- if (ex_hdr->response) {
- if (!hdr->out_words && !ex_hdr->provider_out_words)
- return -EINVAL;
- if (hdr->out_words * 8 < method_elm->resp_size)
- return -ENOSPC;
- if (!access_ok(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;
- if (count < method_elm->req_size + sizeof(hdr)) {
- /*
- * rdma-core v18 and v19 have a bug where they send DESTROY_CQ
- * with a 16 byte write instead of 24. Old kernels didn't
- * check the size so they allowed this. Now that the size is
- * checked provide a compatibility work around to not break
- * those userspaces.
- */
- if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ &&
- count == 16) {
- hdr->in_words = 6;
- return 0;
- }
- return -ENOSPC;
- }
- if (hdr->out_words * 4 < method_elm->resp_size)
- return -ENOSPC;
- 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;
- const struct uverbs_api_write_method *method_elm;
- struct uverbs_api *uapi = file->device->uapi;
- struct ib_uverbs_ex_cmd_hdr ex_hdr;
- struct ib_uverbs_cmd_hdr hdr;
- struct uverbs_attr_bundle bundle;
- 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;
- method_elm = uapi_get_method(uapi, hdr.command);
- if (IS_ERR(method_elm))
- return PTR_ERR(method_elm);
- if (method_elm->is_ex) {
- 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, method_elm);
- if (ret)
- return ret;
- srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
- buf += sizeof(hdr);
- memset(bundle.attr_present, 0, sizeof(bundle.attr_present));
- bundle.ufile = file;
- bundle.context = NULL; /* only valid if bundle has uobject */
- bundle.uobject = NULL;
- if (!method_elm->is_ex) {
- size_t in_len = hdr.in_words * 4 - sizeof(hdr);
- size_t out_len = hdr.out_words * 4;
- u64 response = 0;
- if (method_elm->has_udata) {
- bundle.driver_udata.inlen =
- in_len - method_elm->req_size;
- in_len = method_elm->req_size;
- if (bundle.driver_udata.inlen)
- bundle.driver_udata.inbuf = buf + in_len;
- else
- bundle.driver_udata.inbuf = NULL;
- } else {
- memset(&bundle.driver_udata, 0,
- sizeof(bundle.driver_udata));
- }
- if (method_elm->has_resp) {
- /*
- * The macros check that if has_resp is set
- * then the command request structure starts
- * with a '__aligned u64 response' member.
- */
- ret = get_user(response, (const u64 __user *)buf);
- if (ret)
- goto out_unlock;
- if (method_elm->has_udata) {
- bundle.driver_udata.outlen =
- out_len - method_elm->resp_size;
- out_len = method_elm->resp_size;
- if (bundle.driver_udata.outlen)
- bundle.driver_udata.outbuf =
- u64_to_user_ptr(response +
- out_len);
- else
- bundle.driver_udata.outbuf = NULL;
- }
- } else {
- bundle.driver_udata.outlen = 0;
- bundle.driver_udata.outbuf = NULL;
- }
- ib_uverbs_init_udata_buf_or_null(
- &bundle.ucore, buf, u64_to_user_ptr(response),
- in_len, out_len);
- } else {
- buf += sizeof(ex_hdr);
- ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf,
- u64_to_user_ptr(ex_hdr.response),
- hdr.in_words * 8, hdr.out_words * 8);
- ib_uverbs_init_udata_buf_or_null(
- &bundle.driver_udata, buf + bundle.ucore.inlen,
- u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen,
- ex_hdr.provider_in_words * 8,
- ex_hdr.provider_out_words * 8);
- }
- ret = method_elm->handler(&bundle);
- if (bundle.uobject)
- uverbs_finalize_object(bundle.uobject, UVERBS_ACCESS_NEW, true,
- !ret, &bundle);
- out_unlock:
- srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
- return (ret) ? : count;
- }
- static const struct vm_operations_struct rdma_umap_ops;
- 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(file);
- if (IS_ERR(ucontext)) {
- ret = PTR_ERR(ucontext);
- goto out;
- }
- vma->vm_ops = &rdma_umap_ops;
- ret = ucontext->device->ops.mmap(ucontext, vma);
- out:
- srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
- return ret;
- }
- /*
- * The VMA has been dup'd, initialize the vm_private_data with a new tracking
- * struct
- */
- static void rdma_umap_open(struct vm_area_struct *vma)
- {
- struct ib_uverbs_file *ufile = vma->vm_file->private_data;
- struct rdma_umap_priv *opriv = vma->vm_private_data;
- struct rdma_umap_priv *priv;
- if (!opriv)
- return;
- /* We are racing with disassociation */
- if (!down_read_trylock(&ufile->hw_destroy_rwsem))
- goto out_zap;
- /*
- * Disassociation already completed, the VMA should already be zapped.
- */
- if (!ufile->ucontext)
- goto out_unlock;
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (!priv)
- goto out_unlock;
- rdma_umap_priv_init(priv, vma, opriv->entry);
- up_read(&ufile->hw_destroy_rwsem);
- return;
- out_unlock:
- up_read(&ufile->hw_destroy_rwsem);
- out_zap:
- /*
- * We can't allow the VMA to be created with the actual IO pages, that
- * would break our API contract, and it can't be stopped at this
- * point, so zap it.
- */
- vma->vm_private_data = NULL;
- zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
- }
- static void rdma_umap_close(struct vm_area_struct *vma)
- {
- struct ib_uverbs_file *ufile = vma->vm_file->private_data;
- struct rdma_umap_priv *priv = vma->vm_private_data;
- if (!priv)
- return;
- /*
- * The vma holds a reference on the struct file that created it, which
- * in turn means that the ib_uverbs_file is guaranteed to exist at
- * this point.
- */
- mutex_lock(&ufile->umap_lock);
- if (priv->entry)
- rdma_user_mmap_entry_put(priv->entry);
- list_del(&priv->list);
- mutex_unlock(&ufile->umap_lock);
- kfree(priv);
- }
- /*
- * Once the zap_vma_ptes has been called touches to the VMA will come here and
- * we return a dummy writable zero page for all the pfns.
- */
- static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
- {
- struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
- struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
- vm_fault_t ret = 0;
- if (!priv)
- return VM_FAULT_SIGBUS;
- /* Read only pages can just use the system zero page. */
- if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
- vmf->page = ZERO_PAGE(vmf->address);
- get_page(vmf->page);
- return 0;
- }
- mutex_lock(&ufile->umap_lock);
- if (!ufile->disassociate_page)
- ufile->disassociate_page =
- alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
- if (ufile->disassociate_page) {
- /*
- * This VMA is forced to always be shared so this doesn't have
- * to worry about COW.
- */
- vmf->page = ufile->disassociate_page;
- get_page(vmf->page);
- } else {
- ret = VM_FAULT_SIGBUS;
- }
- mutex_unlock(&ufile->umap_lock);
- return ret;
- }
- static const struct vm_operations_struct rdma_umap_ops = {
- .open = rdma_umap_open,
- .close = rdma_umap_close,
- .fault = rdma_umap_fault,
- };
- void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
- {
- struct rdma_umap_priv *priv, *next_priv;
- lockdep_assert_held(&ufile->hw_destroy_rwsem);
- while (1) {
- struct mm_struct *mm = NULL;
- /* Get an arbitrary mm pointer that hasn't been cleaned yet */
- mutex_lock(&ufile->umap_lock);
- while (!list_empty(&ufile->umaps)) {
- int ret;
- priv = list_first_entry(&ufile->umaps,
- struct rdma_umap_priv, list);
- mm = priv->vma->vm_mm;
- ret = mmget_not_zero(mm);
- if (!ret) {
- list_del_init(&priv->list);
- if (priv->entry) {
- rdma_user_mmap_entry_put(priv->entry);
- priv->entry = NULL;
- }
- mm = NULL;
- continue;
- }
- break;
- }
- mutex_unlock(&ufile->umap_lock);
- if (!mm)
- return;
- /*
- * The umap_lock is nested under mmap_lock since it used within
- * the vma_ops callbacks, so we have to clean the list one mm
- * at a time to get the lock ordering right. Typically there
- * will only be one mm, so no big deal.
- */
- mmap_read_lock(mm);
- mutex_lock(&ufile->umap_lock);
- list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
- list) {
- struct vm_area_struct *vma = priv->vma;
- if (vma->vm_mm != mm)
- continue;
- list_del_init(&priv->list);
- zap_vma_ptes(vma, vma->vm_start,
- vma->vm_end - vma->vm_start);
- if (priv->entry) {
- rdma_user_mmap_entry_put(priv->entry);
- priv->entry = NULL;
- }
- }
- mutex_unlock(&ufile->umap_lock);
- mmap_read_unlock(mm);
- mmput(mm);
- }
- }
- /*
- * 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;
- get_device(&dev->dev);
- 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;
- }
- if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
- ret = -EPERM;
- 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->ops.disassociate_ucontext);
- if (module_dependent) {
- if (!try_module_get(ib_dev->ops.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);
- mutex_init(&file->umap_lock);
- INIT_LIST_HEAD(&file->umaps);
- filp->private_data = file;
- list_add_tail(&file->list, &dev->uverbs_file_list);
- mutex_unlock(&dev->lists_mutex);
- srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
- setup_ufile_idr_uobject(file);
- return stream_open(inode, filp);
- err_module:
- module_put(ib_dev->ops.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);
- put_device(&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);
- list_del_init(&file->list);
- 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 = compat_ptr_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 = compat_ptr_ioctl,
- };
- static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
- struct ib_client_nl_info *res)
- {
- struct ib_uverbs_device *uverbs_dev = client_data;
- int ret;
- if (res->port != -1)
- return -EINVAL;
- res->abi = ibdev->ops.uverbs_abi_ver;
- res->cdev = &uverbs_dev->dev;
- /*
- * To support DRIVER_ID binding in userspace some of the driver need
- * upgrading to expose their PCI dependent revision information
- * through get_context instead of relying on modalias matching. When
- * the drivers are fixed they can drop this flag.
- */
- if (!ibdev->ops.uverbs_no_driver_id_binding) {
- ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
- ibdev->ops.driver_id);
- if (ret)
- return ret;
- }
- return 0;
- }
- static struct ib_client uverbs_client = {
- .name = "uverbs",
- .no_kverbs_req = true,
- .add = ib_uverbs_add_one,
- .remove = ib_uverbs_remove_one,
- .get_nl_info = ib_uverbs_get_nl_info,
- };
- MODULE_ALIAS_RDMA_CLIENT("uverbs");
- static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
- char *buf)
- {
- struct ib_uverbs_device *dev =
- container_of(device, struct ib_uverbs_device, dev);
- int ret = -ENODEV;
- int srcu_key;
- struct ib_device *ib_dev;
- 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", dev_name(&ib_dev->dev));
- srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
- return ret;
- }
- static DEVICE_ATTR_RO(ibdev);
- static ssize_t abi_version_show(struct device *device,
- struct device_attribute *attr, char *buf)
- {
- struct ib_uverbs_device *dev =
- container_of(device, struct ib_uverbs_device, dev);
- int ret = -ENODEV;
- int srcu_key;
- struct ib_device *ib_dev;
- srcu_key = srcu_read_lock(&dev->disassociate_srcu);
- ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
- if (ib_dev)
- ret = sprintf(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
- srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
- return ret;
- }
- static DEVICE_ATTR_RO(abi_version);
- static struct attribute *ib_dev_attrs[] = {
- &dev_attr_abi_version.attr,
- &dev_attr_ibdev.attr,
- NULL,
- };
- static const struct attribute_group dev_attr_group = {
- .attrs = ib_dev_attrs,
- };
- 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);
- if (IS_ERR(uapi))
- return PTR_ERR(uapi);
- uverbs_dev->uapi = uapi;
- return 0;
- }
- static int ib_uverbs_add_one(struct ib_device *device)
- {
- int devnum;
- dev_t base;
- struct ib_uverbs_device *uverbs_dev;
- int ret;
- if (!device->ops.alloc_ucontext)
- return -EOPNOTSUPP;
- uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
- if (!uverbs_dev)
- return -ENOMEM;
- ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
- if (ret) {
- kfree(uverbs_dev);
- return -ENOMEM;
- }
- device_initialize(&uverbs_dev->dev);
- uverbs_dev->dev.class = uverbs_class;
- uverbs_dev->dev.parent = device->dev.parent;
- uverbs_dev->dev.release = ib_uverbs_release_dev;
- uverbs_dev->groups[0] = &dev_attr_group;
- uverbs_dev->dev.groups = uverbs_dev->groups;
- atomic_set(&uverbs_dev->refcount, 1);
- init_completion(&uverbs_dev->comp);
- uverbs_dev->xrcd_tree = RB_ROOT;
- mutex_init(&uverbs_dev->xrcd_tree_mutex);
- mutex_init(&uverbs_dev->lists_mutex);
- INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
- rcu_assign_pointer(uverbs_dev->ib_dev, device);
- uverbs_dev->num_comp_vectors = device->num_comp_vectors;
- devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
- GFP_KERNEL);
- if (devnum < 0) {
- ret = -ENOMEM;
- goto err;
- }
- uverbs_dev->devnum = devnum;
- if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
- base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
- else
- base = IB_UVERBS_BASE_DEV + devnum;
- ret = ib_uverbs_create_uapi(device, uverbs_dev);
- if (ret)
- goto err_uapi;
- uverbs_dev->dev.devt = base;
- dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
- cdev_init(&uverbs_dev->cdev,
- device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
- uverbs_dev->cdev.owner = THIS_MODULE;
- ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
- if (ret)
- goto err_uapi;
- ib_set_client_data(device, &uverbs_client, uverbs_dev);
- return 0;
- err_uapi:
- ida_free(&uverbs_ida, devnum);
- err:
- if (atomic_dec_and_test(&uverbs_dev->refcount))
- ib_uverbs_comp_dev(uverbs_dev);
- wait_for_completion(&uverbs_dev->comp);
- put_device(&uverbs_dev->dev);
- return ret;
- }
- static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
- struct ib_device *ib_dev)
- {
- struct ib_uverbs_file *file;
- /* Pending running commands to terminate */
- uverbs_disassociate_api_pre(uverbs_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);
- list_del_init(&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);
- uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
- kref_put(&file->ref, ib_uverbs_release_file);
- mutex_lock(&uverbs_dev->lists_mutex);
- }
- 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;
- cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
- ida_free(&uverbs_ida, uverbs_dev->devnum);
- if (device->ops.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);
- put_device(&uverbs_dev->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_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);
- mmu_notifier_synchronize();
- }
- module_init(ib_uverbs_init);
- module_exit(ib_uverbs_cleanup);
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