/*
 * Copyright (c) 2017, Mellanox Technologies 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 <rdma/uverbs_std_types.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/ib_verbs.h>
#include <linux/bug.h>
#include <linux/file.h>
#include "rdma_core.h"
#include "uverbs.h"

static int uverbs_free_ah(struct ib_uobject *uobject,
                          enum rdma_remove_reason why)
{
        return rdma_destroy_ah((struct ib_ah *)uobject->object);
}

static int uverbs_free_flow(struct ib_uobject *uobject,
                            enum rdma_remove_reason why)
{
        return ib_destroy_flow((struct ib_flow *)uobject->object);
}

static int uverbs_free_mw(struct ib_uobject *uobject,
                          enum rdma_remove_reason why)
{
        return uverbs_dealloc_mw((struct ib_mw *)uobject->object);
}

static int uverbs_free_qp(struct ib_uobject *uobject,
                          enum rdma_remove_reason why)
{
        struct ib_qp *qp = uobject->object;
        struct ib_uqp_object *uqp =
                container_of(uobject, struct ib_uqp_object, uevent.uobject);
        int ret;

        if (why == RDMA_REMOVE_DESTROY) {
                if (!list_empty(&uqp->mcast_list))
                        return -EBUSY;
        } else if (qp == qp->real_qp) {
                ib_uverbs_detach_umcast(qp, uqp);
        }

        ret = ib_destroy_qp(qp);
        if (ret && why == RDMA_REMOVE_DESTROY)
                return ret;

        if (uqp->uxrcd)
                atomic_dec(&uqp->uxrcd->refcnt);

        ib_uverbs_release_uevent(uobject->context->ufile, &uqp->uevent);
        return ret;
}

static int uverbs_free_rwq_ind_tbl(struct ib_uobject *uobject,
                                   enum rdma_remove_reason why)
{
        struct ib_rwq_ind_table *rwq_ind_tbl = uobject->object;
        struct ib_wq **ind_tbl = rwq_ind_tbl->ind_tbl;
        int ret;

        ret = ib_destroy_rwq_ind_table(rwq_ind_tbl);
        if (!ret || why != RDMA_REMOVE_DESTROY)
                kfree(ind_tbl);
        return ret;
}

static int uverbs_free_wq(struct ib_uobject *uobject,
                          enum rdma_remove_reason why)
{
        struct ib_wq *wq = uobject->object;
        struct ib_uwq_object *uwq =
                container_of(uobject, struct ib_uwq_object, uevent.uobject);
        int ret;

        ret = ib_destroy_wq(wq);
        if (!ret || why != RDMA_REMOVE_DESTROY)
                ib_uverbs_release_uevent(uobject->context->ufile, &uwq->uevent);
        return ret;
}

static int uverbs_free_srq(struct ib_uobject *uobject,
                           enum rdma_remove_reason why)
{
        struct ib_srq *srq = uobject->object;
        struct ib_uevent_object *uevent =
                container_of(uobject, struct ib_uevent_object, uobject);
        enum ib_srq_type  srq_type = srq->srq_type;
        int ret;

        ret = ib_destroy_srq(srq);

        if (ret && why == RDMA_REMOVE_DESTROY)
                return ret;

        if (srq_type == IB_SRQT_XRC) {
                struct ib_usrq_object *us =
                        container_of(uevent, struct ib_usrq_object, uevent);

                atomic_dec(&us->uxrcd->refcnt);
        }

        ib_uverbs_release_uevent(uobject->context->ufile, uevent);
        return ret;
}

static int uverbs_free_cq(struct ib_uobject *uobject,
                          enum rdma_remove_reason why)
{
        struct ib_cq *cq = uobject->object;
        struct ib_uverbs_event_queue *ev_queue = cq->cq_context;
        struct ib_ucq_object *ucq =
                container_of(uobject, struct ib_ucq_object, uobject);
        int ret;

        ret = ib_destroy_cq(cq);
        if (!ret || why != RDMA_REMOVE_DESTROY)
                ib_uverbs_release_ucq(uobject->context->ufile, ev_queue ?
                                      container_of(ev_queue,
                                                   struct ib_uverbs_completion_event_file,
                                                   ev_queue) : NULL,
                                      ucq);
        return ret;
}

static int uverbs_free_mr(struct ib_uobject *uobject,
                          enum rdma_remove_reason why)
{
        return ib_dereg_mr((struct ib_mr *)uobject->object);
}

static int uverbs_free_xrcd(struct ib_uobject *uobject,
                            enum rdma_remove_reason why)
{
        struct ib_xrcd *xrcd = uobject->object;
        struct ib_uxrcd_object *uxrcd =
                container_of(uobject, struct ib_uxrcd_object, uobject);
        int ret;

        mutex_lock(&uobject->context->ufile->device->xrcd_tree_mutex);
        if (why == RDMA_REMOVE_DESTROY && atomic_read(&uxrcd->refcnt))
                ret = -EBUSY;
        else
                ret = ib_uverbs_dealloc_xrcd(uobject->context->ufile->device,
                                             xrcd, why);
        mutex_unlock(&uobject->context->ufile->device->xrcd_tree_mutex);

        return ret;
}

static int uverbs_free_pd(struct ib_uobject *uobject,
                          enum rdma_remove_reason why)
{
        struct ib_pd *pd = uobject->object;

        if (why == RDMA_REMOVE_DESTROY && atomic_read(&pd->usecnt))
                return -EBUSY;

        ib_dealloc_pd((struct ib_pd *)uobject->object);
        return 0;
}

static int uverbs_hot_unplug_completion_event_file(struct ib_uobject_file *uobj_file,
                                                   enum rdma_remove_reason why)
{
        struct ib_uverbs_completion_event_file *comp_event_file =
                container_of(uobj_file, struct ib_uverbs_completion_event_file,
                             uobj_file);
        struct ib_uverbs_event_queue *event_queue = &comp_event_file->ev_queue;

        spin_lock_irq(&event_queue->lock);
        event_queue->is_closed = 1;
        spin_unlock_irq(&event_queue->lock);

        if (why == RDMA_REMOVE_DRIVER_REMOVE) {
                wake_up_interruptible(&event_queue->poll_wait);
                kill_fasync(&event_queue->async_queue, SIGIO, POLL_IN);
        }
        return 0;
};

const struct uverbs_obj_fd_type uverbs_type_attrs_comp_channel = {
        .type = UVERBS_TYPE_ALLOC_FD(sizeof(struct ib_uverbs_completion_event_file), 0),
        .context_closed = uverbs_hot_unplug_completion_event_file,
        .fops = &uverbs_event_fops,
        .name = "[infinibandevent]",
        .flags = O_RDONLY,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_cq = {
        .type = UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_ucq_object), 0),
        .destroy_object = uverbs_free_cq,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_qp = {
        .type = UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_uqp_object), 0),
        .destroy_object = uverbs_free_qp,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_mw = {
        .type = UVERBS_TYPE_ALLOC_IDR(0),
        .destroy_object = uverbs_free_mw,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_mr = {
        /* 1 is used in order to free the MR after all the MWs */
        .type = UVERBS_TYPE_ALLOC_IDR(1),
        .destroy_object = uverbs_free_mr,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_srq = {
        .type = UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_usrq_object), 0),
        .destroy_object = uverbs_free_srq,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_ah = {
        .type = UVERBS_TYPE_ALLOC_IDR(0),
        .destroy_object = uverbs_free_ah,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_flow = {
        .type = UVERBS_TYPE_ALLOC_IDR(0),
        .destroy_object = uverbs_free_flow,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_wq = {
        .type = UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_uwq_object), 0),
        .destroy_object = uverbs_free_wq,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_rwq_ind_table = {
        .type = UVERBS_TYPE_ALLOC_IDR(0),
        .destroy_object = uverbs_free_rwq_ind_tbl,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_xrcd = {
        .type = UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_uxrcd_object), 0),
        .destroy_object = uverbs_free_xrcd,
};

const struct uverbs_obj_idr_type uverbs_type_attrs_pd = {
        /* 2 is used in order to free the PD after MRs */
        .type = UVERBS_TYPE_ALLOC_IDR(2),
        .destroy_object = uverbs_free_pd,
};