/*
 * Copyright (c) 2018, 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_core.h"
#include "uverbs.h"
#include <rdma/uverbs_std_types.h>

static int uverbs_free_dm(struct ib_uobject *uobject,
                          enum rdma_remove_reason why,
                          struct uverbs_attr_bundle *attrs)
{
        struct ib_dm *dm = uobject->object;

        if (atomic_read(&dm->usecnt))
                return -EBUSY;

        return dm->device->ops.dealloc_dm(dm, attrs);
}

static int UVERBS_HANDLER(UVERBS_METHOD_DM_ALLOC)(
        struct uverbs_attr_bundle *attrs)
{
        struct ib_dm_alloc_attr attr = {};
        struct ib_uobject *uobj =
                uverbs_attr_get(attrs, UVERBS_ATTR_ALLOC_DM_HANDLE)
                        ->obj_attr.uobject;
        struct ib_device *ib_dev = attrs->context->device;
        struct ib_dm *dm;
        int ret;

        if (!ib_dev->ops.alloc_dm)
                return -EOPNOTSUPP;

        ret = uverbs_copy_from(&attr.length, attrs,
                               UVERBS_ATTR_ALLOC_DM_LENGTH);
        if (ret)
                return ret;

        ret = uverbs_copy_from(&attr.alignment, attrs,
                               UVERBS_ATTR_ALLOC_DM_ALIGNMENT);
        if (ret)
                return ret;

        dm = ib_dev->ops.alloc_dm(ib_dev, attrs->context, &attr, attrs);
        if (IS_ERR(dm))
                return PTR_ERR(dm);

        dm->device  = ib_dev;
        dm->length  = attr.length;
        dm->uobject = uobj;
        atomic_set(&dm->usecnt, 0);

        uobj->object = dm;

        return 0;
}

DECLARE_UVERBS_NAMED_METHOD(
        UVERBS_METHOD_DM_ALLOC,
        UVERBS_ATTR_IDR(UVERBS_ATTR_ALLOC_DM_HANDLE,
                        UVERBS_OBJECT_DM,
                        UVERBS_ACCESS_NEW,
                        UA_MANDATORY),
        UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_LENGTH,
                           UVERBS_ATTR_TYPE(u64),
                           UA_MANDATORY),
        UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_ALIGNMENT,
                           UVERBS_ATTR_TYPE(u32),
                           UA_MANDATORY));

DECLARE_UVERBS_NAMED_METHOD_DESTROY(
        UVERBS_METHOD_DM_FREE,
        UVERBS_ATTR_IDR(UVERBS_ATTR_FREE_DM_HANDLE,
                        UVERBS_OBJECT_DM,
                        UVERBS_ACCESS_DESTROY,
                        UA_MANDATORY));

DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_DM,
                            UVERBS_TYPE_ALLOC_IDR(uverbs_free_dm),
                            &UVERBS_METHOD(UVERBS_METHOD_DM_ALLOC),
                            &UVERBS_METHOD(UVERBS_METHOD_DM_FREE));

const struct uapi_definition uverbs_def_obj_dm[] = {
        UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_DM,
                                      UAPI_DEF_OBJ_NEEDS_FN(dealloc_dm)),
        {}
};