/*******************************************************************************
* Copyright 2021 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/

#ifndef GPU_OCL_GEN9_GLOBAL_POOLING_HPP
#define GPU_OCL_GEN9_GLOBAL_POOLING_HPP

#include "common/c_types_map.hpp"
#include "common/primitive.hpp"
#include "gpu/compute/compute.hpp"
#include "gpu/gpu_pooling_pd.hpp"
#include "gpu/gpu_primitive.hpp"
#include "gpu/gpu_resource.hpp"
#include "gpu/ocl/ocl_stream.hpp"
#include "gpu/ocl/ocl_utils.hpp"
#include "gpu/primitive_conf.hpp"

namespace dnnl {
namespace impl {
namespace gpu {
namespace ocl {

struct gen9_global_pooling_bwd_t : public gpu_primitive_t {
    using gpu_primitive_t::gpu_primitive_t;
    struct pd_t : public gpu_pooling_bwd_pd_t {
        pd_t(const pooling_v2_desc_t *adesc, const primitive_attr_t *attr,
                const pooling_fwd_pd_t *hint_fwd_pd)
            : gpu_pooling_bwd_pd_t(adesc, attr, hint_fwd_pd) {}

        DECLARE_COMMON_PD_T("ocl:gen9_global:any", gen9_global_pooling_bwd_t);

        status_t init(engine_t *engine) {
            using namespace prop_kind;
            using namespace alg_kind;

            bool ok = set_default_params() == status::success
                    && utils::one_of(desc()->prop_kind, backward_data)
                    && utils::one_of(desc()->alg_kind, pooling_max,
                            pooling_avg_include_padding,
                            pooling_avg_exclude_padding)
                    && (utils::everyone_is(data_type::f32,
                                diff_dst_md()->data_type,
                                diff_src_md()->data_type)
                            || utils::everyone_is(data_type::bf16,
                                    diff_dst_md()->data_type,
                                    diff_src_md()->data_type))
                    && attr()->has_default_values();
            if (!ok) return status::unimplemented;

            if (desc()->alg_kind == pooling_max) {
                init_default_ws(data_type::s32);
                if (!compare_ws(hint_fwd_pd_)) return status::unimplemented;
            }

            return init_conf(engine);
        }

        status_t init_conf(engine_t *engine);
        status_t init_kernel_ctx(compute::kernel_ctx_t &kernel_ctx) const;

        pool_conf_t conf;
        offsets_t off;
    };

    status_t init(engine_t *engine) override {
        compute::kernel_ctx_t kernel_ctx;
        status_t status = pd()->init_kernel_ctx(kernel_ctx);
        CHECK(status);

        create_kernel(engine, &kernel_, "gen9_global_pooling_bwd", kernel_ctx);
        if (!kernel_) return status::runtime_error;

        return status::success;
    }

    status_t execute(const exec_ctx_t &ctx) const override {
        return execute_backward(ctx);
    }

private:
    status_t execute_backward(const exec_ctx_t &ctx) const;
    const pd_t *pd() const { return (const pd_t *)primitive_t::pd().get(); }
    compute::kernel_t kernel_;
};

} // namespace ocl
} // namespace gpu
} // namespace impl
} // namespace dnnl

#endif
