1477 строки
41 KiB
C
1477 строки
41 KiB
C
/*
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* Copyright (c) 2005 Topspin Communications. All rights reserved.
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* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2005 Voltaire, Inc. All rights reserved.
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* Copyright (c) 2005 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/file.h>
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#include <linux/cdev.h>
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#include <linux/anon_inodes.h>
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#include <linux/slab.h>
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#include <linux/sched/mm.h>
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#include <linux/uaccess.h>
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#include <rdma/ib.h>
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#include <rdma/uverbs_std_types.h>
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#include "uverbs.h"
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#include "core_priv.h"
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#include "rdma_core.h"
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MODULE_AUTHOR("Roland Dreier");
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MODULE_DESCRIPTION("InfiniBand userspace verbs access");
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MODULE_LICENSE("Dual BSD/GPL");
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enum {
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IB_UVERBS_MAJOR = 231,
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IB_UVERBS_BASE_MINOR = 192,
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IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
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IB_UVERBS_NUM_FIXED_MINOR = 32,
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IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
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};
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#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
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static dev_t dynamic_uverbs_dev;
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static struct class *uverbs_class;
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static DEFINE_IDA(uverbs_ida);
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static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
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const char __user *buf, int in_len,
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int out_len) = {
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[IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
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[IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
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[IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
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[IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
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[IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
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[IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
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[IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr,
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[IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
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[IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw,
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[IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw,
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[IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
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[IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
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[IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
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[IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
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[IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
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[IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
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[IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
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[IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
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[IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
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[IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
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[IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
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[IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
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[IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
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[IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
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[IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
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[IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
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[IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
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[IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
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[IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
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[IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
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[IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
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[IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd,
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[IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd,
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[IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq,
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[IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp,
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};
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static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
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struct ib_udata *ucore,
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struct ib_udata *uhw) = {
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[IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow,
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[IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow,
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[IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device,
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[IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq,
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[IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp,
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[IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq,
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[IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq,
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[IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq,
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[IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
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[IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
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[IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp,
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[IB_USER_VERBS_EX_CMD_MODIFY_CQ] = ib_uverbs_ex_modify_cq,
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};
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static void ib_uverbs_add_one(struct ib_device *device);
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static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
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/*
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* Must be called with the ufile->device->disassociate_srcu held, and the lock
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* must be held until use of the ucontext is finished.
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*/
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struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile)
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{
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/*
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* We do not hold the hw_destroy_rwsem lock for this flow, instead
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* srcu is used. It does not matter if someone races this with
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* get_context, we get NULL or valid ucontext.
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*/
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struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
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if (!srcu_dereference(ufile->device->ib_dev,
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&ufile->device->disassociate_srcu))
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return ERR_PTR(-EIO);
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if (!ucontext)
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return ERR_PTR(-EINVAL);
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return ucontext;
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}
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EXPORT_SYMBOL(ib_uverbs_get_ucontext);
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int uverbs_dealloc_mw(struct ib_mw *mw)
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{
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struct ib_pd *pd = mw->pd;
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int ret;
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ret = mw->device->dealloc_mw(mw);
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if (!ret)
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atomic_dec(&pd->usecnt);
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return ret;
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}
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static void ib_uverbs_release_dev(struct device *device)
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{
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struct ib_uverbs_device *dev =
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container_of(device, struct ib_uverbs_device, dev);
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uverbs_destroy_api(dev->uapi);
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cleanup_srcu_struct(&dev->disassociate_srcu);
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kfree(dev);
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}
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static void ib_uverbs_release_async_event_file(struct kref *ref)
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{
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struct ib_uverbs_async_event_file *file =
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container_of(ref, struct ib_uverbs_async_event_file, ref);
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kfree(file);
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}
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void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
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struct ib_uverbs_completion_event_file *ev_file,
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struct ib_ucq_object *uobj)
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{
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struct ib_uverbs_event *evt, *tmp;
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if (ev_file) {
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spin_lock_irq(&ev_file->ev_queue.lock);
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list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
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list_del(&evt->list);
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kfree(evt);
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}
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spin_unlock_irq(&ev_file->ev_queue.lock);
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uverbs_uobject_put(&ev_file->uobj);
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}
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spin_lock_irq(&file->async_file->ev_queue.lock);
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list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
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list_del(&evt->list);
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kfree(evt);
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}
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spin_unlock_irq(&file->async_file->ev_queue.lock);
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}
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void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
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struct ib_uevent_object *uobj)
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{
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struct ib_uverbs_event *evt, *tmp;
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spin_lock_irq(&file->async_file->ev_queue.lock);
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list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
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list_del(&evt->list);
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kfree(evt);
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}
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spin_unlock_irq(&file->async_file->ev_queue.lock);
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}
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void ib_uverbs_detach_umcast(struct ib_qp *qp,
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struct ib_uqp_object *uobj)
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{
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struct ib_uverbs_mcast_entry *mcast, *tmp;
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list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
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ib_detach_mcast(qp, &mcast->gid, mcast->lid);
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list_del(&mcast->list);
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kfree(mcast);
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}
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}
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static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
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{
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complete(&dev->comp);
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}
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void ib_uverbs_release_file(struct kref *ref)
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{
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struct ib_uverbs_file *file =
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container_of(ref, struct ib_uverbs_file, ref);
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struct ib_device *ib_dev;
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int srcu_key;
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release_ufile_idr_uobject(file);
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srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
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ib_dev = srcu_dereference(file->device->ib_dev,
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&file->device->disassociate_srcu);
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if (ib_dev && !ib_dev->disassociate_ucontext)
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module_put(ib_dev->owner);
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srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
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if (atomic_dec_and_test(&file->device->refcount))
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ib_uverbs_comp_dev(file->device);
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put_device(&file->device->dev);
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kfree(file);
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}
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static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
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struct ib_uverbs_file *uverbs_file,
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struct file *filp, char __user *buf,
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size_t count, loff_t *pos,
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size_t eventsz)
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{
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struct ib_uverbs_event *event;
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int ret = 0;
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spin_lock_irq(&ev_queue->lock);
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while (list_empty(&ev_queue->event_list)) {
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spin_unlock_irq(&ev_queue->lock);
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if (filp->f_flags & O_NONBLOCK)
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return -EAGAIN;
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if (wait_event_interruptible(ev_queue->poll_wait,
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(!list_empty(&ev_queue->event_list) ||
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/* The barriers built into wait_event_interruptible()
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* and wake_up() guarentee this will see the null set
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* without using RCU
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*/
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!uverbs_file->device->ib_dev)))
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return -ERESTARTSYS;
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/* If device was disassociated and no event exists set an error */
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if (list_empty(&ev_queue->event_list) &&
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!uverbs_file->device->ib_dev)
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return -EIO;
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spin_lock_irq(&ev_queue->lock);
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}
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event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
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if (eventsz > count) {
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ret = -EINVAL;
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event = NULL;
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} else {
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list_del(ev_queue->event_list.next);
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if (event->counter) {
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++(*event->counter);
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list_del(&event->obj_list);
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}
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}
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spin_unlock_irq(&ev_queue->lock);
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if (event) {
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if (copy_to_user(buf, event, eventsz))
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ret = -EFAULT;
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else
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ret = eventsz;
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}
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kfree(event);
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return ret;
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}
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static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct ib_uverbs_async_event_file *file = filp->private_data;
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return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp,
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buf, count, pos,
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sizeof(struct ib_uverbs_async_event_desc));
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}
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static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct ib_uverbs_completion_event_file *comp_ev_file =
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filp->private_data;
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return ib_uverbs_event_read(&comp_ev_file->ev_queue,
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comp_ev_file->uobj.ufile, filp,
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buf, count, pos,
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sizeof(struct ib_uverbs_comp_event_desc));
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}
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static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
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struct file *filp,
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struct poll_table_struct *wait)
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{
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__poll_t pollflags = 0;
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poll_wait(filp, &ev_queue->poll_wait, wait);
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spin_lock_irq(&ev_queue->lock);
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if (!list_empty(&ev_queue->event_list))
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pollflags = EPOLLIN | EPOLLRDNORM;
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spin_unlock_irq(&ev_queue->lock);
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return pollflags;
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}
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static __poll_t ib_uverbs_async_event_poll(struct file *filp,
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struct poll_table_struct *wait)
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{
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return ib_uverbs_event_poll(filp->private_data, filp, wait);
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}
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static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
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struct poll_table_struct *wait)
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{
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struct ib_uverbs_completion_event_file *comp_ev_file =
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filp->private_data;
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return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
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}
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static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
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{
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struct ib_uverbs_event_queue *ev_queue = filp->private_data;
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return fasync_helper(fd, filp, on, &ev_queue->async_queue);
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}
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static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
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{
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struct ib_uverbs_completion_event_file *comp_ev_file =
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filp->private_data;
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return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
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}
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static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
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{
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struct ib_uverbs_async_event_file *file = filp->private_data;
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struct ib_uverbs_file *uverbs_file = file->uverbs_file;
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struct ib_uverbs_event *entry, *tmp;
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int closed_already = 0;
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mutex_lock(&uverbs_file->device->lists_mutex);
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spin_lock_irq(&file->ev_queue.lock);
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closed_already = file->ev_queue.is_closed;
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file->ev_queue.is_closed = 1;
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list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
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if (entry->counter)
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list_del(&entry->obj_list);
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kfree(entry);
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}
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spin_unlock_irq(&file->ev_queue.lock);
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if (!closed_already) {
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list_del(&file->list);
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ib_unregister_event_handler(&uverbs_file->event_handler);
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}
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mutex_unlock(&uverbs_file->device->lists_mutex);
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kref_put(&uverbs_file->ref, ib_uverbs_release_file);
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kref_put(&file->ref, ib_uverbs_release_async_event_file);
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return 0;
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}
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static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
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{
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struct ib_uobject *uobj = filp->private_data;
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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;
|
|
}
|
|
|
|
/*
|
|
* Each time we map IO memory into user space this keeps track of the mapping.
|
|
* When the device is hot-unplugged we 'zap' the mmaps in user space to point
|
|
* to the zero page and allow the hot unplug to proceed.
|
|
*
|
|
* This is necessary for cases like PCI physical hot unplug as the actual BAR
|
|
* memory may vanish after this and access to it from userspace could MCE.
|
|
*
|
|
* RDMA drivers supporting disassociation must have their user space designed
|
|
* to cope in some way with their IO pages going to the zero page.
|
|
*/
|
|
struct rdma_umap_priv {
|
|
struct vm_area_struct *vma;
|
|
struct list_head list;
|
|
};
|
|
|
|
static const struct vm_operations_struct rdma_umap_ops;
|
|
|
|
static void rdma_umap_priv_init(struct rdma_umap_priv *priv,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct ib_uverbs_file *ufile = vma->vm_file->private_data;
|
|
|
|
priv->vma = vma;
|
|
vma->vm_private_data = priv;
|
|
vma->vm_ops = &rdma_umap_ops;
|
|
|
|
mutex_lock(&ufile->umap_lock);
|
|
list_add(&priv->list, &ufile->umaps);
|
|
mutex_unlock(&ufile->umap_lock);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
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);
|
|
list_del(&priv->list);
|
|
mutex_unlock(&ufile->umap_lock);
|
|
kfree(priv);
|
|
}
|
|
|
|
static const struct vm_operations_struct rdma_umap_ops = {
|
|
.open = rdma_umap_open,
|
|
.close = rdma_umap_close,
|
|
};
|
|
|
|
static struct rdma_umap_priv *rdma_user_mmap_pre(struct ib_ucontext *ucontext,
|
|
struct vm_area_struct *vma,
|
|
unsigned long size)
|
|
{
|
|
struct ib_uverbs_file *ufile = ucontext->ufile;
|
|
struct rdma_umap_priv *priv;
|
|
|
|
if (vma->vm_end - vma->vm_start != size)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* Driver is using this wrong, must be called by ib_uverbs_mmap */
|
|
if (WARN_ON(!vma->vm_file ||
|
|
vma->vm_file->private_data != ufile))
|
|
return ERR_PTR(-EINVAL);
|
|
lockdep_assert_held(&ufile->device->disassociate_srcu);
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return ERR_PTR(-ENOMEM);
|
|
return priv;
|
|
}
|
|
|
|
/*
|
|
* Map IO memory into a process. This is to be called by drivers as part of
|
|
* their mmap() functions if they wish to send something like PCI-E BAR memory
|
|
* to userspace.
|
|
*/
|
|
int rdma_user_mmap_io(struct ib_ucontext *ucontext, struct vm_area_struct *vma,
|
|
unsigned long pfn, unsigned long size, pgprot_t prot)
|
|
{
|
|
struct rdma_umap_priv *priv = rdma_user_mmap_pre(ucontext, vma, size);
|
|
|
|
if (IS_ERR(priv))
|
|
return PTR_ERR(priv);
|
|
|
|
vma->vm_page_prot = prot;
|
|
if (io_remap_pfn_range(vma, vma->vm_start, pfn, size, prot)) {
|
|
kfree(priv);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
rdma_umap_priv_init(priv, vma);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rdma_user_mmap_io);
|
|
|
|
/*
|
|
* The page case is here for a slightly different reason, the driver expects
|
|
* to be able to free the page it is sharing to user space when it destroys
|
|
* its ucontext, which means we need to zap the user space references.
|
|
*
|
|
* We could handle this differently by providing an API to allocate a shared
|
|
* page and then only freeing the shared page when the last ufile is
|
|
* destroyed.
|
|
*/
|
|
int rdma_user_mmap_page(struct ib_ucontext *ucontext,
|
|
struct vm_area_struct *vma, struct page *page,
|
|
unsigned long size)
|
|
{
|
|
struct rdma_umap_priv *priv = rdma_user_mmap_pre(ucontext, vma, size);
|
|
|
|
if (IS_ERR(priv))
|
|
return PTR_ERR(priv);
|
|
|
|
if (remap_pfn_range(vma, vma->vm_start, page_to_pfn(page), size,
|
|
vma->vm_page_prot)) {
|
|
kfree(priv);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
rdma_umap_priv_init(priv, vma);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(rdma_user_mmap_page);
|
|
|
|
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);
|
|
if (!list_empty(&ufile->umaps)) {
|
|
mm = list_first_entry(&ufile->umaps,
|
|
struct rdma_umap_priv, list)
|
|
->vma->vm_mm;
|
|
mmget(mm);
|
|
}
|
|
mutex_unlock(&ufile->umap_lock);
|
|
if (!mm)
|
|
return;
|
|
|
|
/*
|
|
* The umap_lock is nested under mmap_sem 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.
|
|
*/
|
|
down_write(&mm->mmap_sem);
|
|
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);
|
|
vma->vm_flags &= ~(VM_SHARED | VM_MAYSHARE);
|
|
}
|
|
mutex_unlock(&ufile->umap_lock);
|
|
up_write(&mm->mmap_sem);
|
|
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;
|
|
}
|
|
|
|
/* 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);
|
|
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);
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
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,
|
|
.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 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, "%d\n", ib_dev->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->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;
|
|
}
|
|
|
|
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);
|
|
INIT_LIST_HEAD(&uverbs_dev->uverbs_events_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)
|
|
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;
|
|
|
|
if (ib_uverbs_create_uapi(device, uverbs_dev))
|
|
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->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;
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
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);
|
|
|
|
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;
|
|
|
|
cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
|
|
ida_free(&uverbs_ida, uverbs_dev->devnum);
|
|
|
|
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);
|
|
|
|
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);
|
|
}
|
|
|
|
module_init(ib_uverbs_init);
|
|
module_exit(ib_uverbs_cleanup);
|