router.h

/*******************************************************************************
 * Copyright 2016, 2018 MINRES Technologies GmbH
 *
 * 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 _SYSC_ROUTER_H_
#define _SYSC_ROUTER_H_
 
#include <limits>
#include <scc/report.h>
#include <scc/utilities.h>
#include <sysc/utils/sc_vector.h>
#include <tlm.h>
#include <tlm/scc/initiator_mixin.h>
#include <tlm/scc/scv/tlm_rec_initiator_socket.h>
#include <tlm/scc/scv/tlm_rec_target_socket.h>
#include <tlm/scc/target_mixin.h>
#include <unordered_map>
#include <util/range_lut.h>
 
namespace scc {
template <unsigned BUSWIDTH = LT, typename TARGET_SOCKET_TYPE = tlm::tlm_target_socket<BUSWIDTH>> struct router : sc_core::sc_module {
    using intor_sckt = tlm::scc::initiator_mixin<tlm::tlm_initiator_socket<BUSWIDTH>>;
    using target_sckt = tlm::scc::target_mixin<TARGET_SOCKET_TYPE>;
    sc_core::sc_vector<target_sckt> target;
    sc_core::sc_vector<intor_sckt> initiator;
    router(const sc_core::sc_module_name& nm, size_t slave_cnt = 1, size_t master_cnt = 1, bool check_overlap_on_add_target = false);
 
    ~router() = default;
    template <typename TYPE> void bind_target(TYPE& socket, size_t idx, uint64_t base, uint64_t size, bool remap = true) {
        set_target_range(idx, base, size, remap);
        initiator[idx].bind(socket);
    }

    template <typename TYPE> void bind_target(TYPE& socket, size_t idx, std::string name) {
        set_target_name(idx, name);
        initiator[idx].bind(socket);
    }

    void set_initiator_base(size_t idx, uint64_t base) { ibases[idx] = base; }
    void set_default_target(size_t idx) { default_idx = idx; }
    void set_target_name(size_t idx, std::string name) { target_name_lut.insert(std::make_pair(name, idx)); }
    void add_target_range(std::string name, uint64_t base, uint64_t size, bool remap = true);
    void set_target_range(size_t idx, uint64_t base, uint64_t size, bool remap = true);
    void set_warn_on_address_error(bool enable) { warn_on_address_error = enable; }
    void b_transport(int i, tlm::tlm_generic_payload& trans, sc_core::sc_time& delay);
    bool get_direct_mem_ptr(int i, tlm::tlm_generic_payload& trans, tlm::tlm_dmi& dmi_data);
    unsigned transport_dbg(int i, tlm::tlm_generic_payload& trans);
    void invalidate_direct_mem_ptr(int id, ::sc_dt::uint64 start_range, ::sc_dt::uint64 end_range);

    void end_of_elaboration() override;
 
protected:
    struct range_entry {
        uint64_t base, size;
        bool remap;
    };
    size_t default_idx = std::numeric_limits<size_t>::max();
    std::vector<uint64_t> ibases;
    std::vector<range_entry> tranges;
    std::vector<sc_core::sc_mutex> mutexes;
    util::range_lut<unsigned> addr_decoder;
    std::unordered_map<std::string, size_t> target_name_lut;
    bool check_overlap_on_add_target;
    bool warn_on_address_error{false};
};
 
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE>
router<BUSWIDTH, TARGET_SOCKET_TYPE>::router(const sc_core::sc_module_name& nm, size_t slave_cnt, size_t master_cnt,
                                             bool check_overlap_on_add_target)
: sc_module(nm)
, target("target", master_cnt)
, initiator("intor", slave_cnt)
, ibases(master_cnt)
, tranges(slave_cnt)
, mutexes(slave_cnt)
, addr_decoder(std::numeric_limits<unsigned>::max())
, check_overlap_on_add_target(check_overlap_on_add_target) {
    for(size_t i = 0; i < target.size(); ++i) {
        target[i].register_b_transport(
            [this, i](tlm::tlm_generic_payload& trans, sc_core::sc_time& delay) -> void { this->b_transport(i, trans, delay); });
        target[i].register_get_direct_mem_ptr([this, i](tlm::tlm_generic_payload& trans, tlm::tlm_dmi& dmi_data) -> bool {
            return this->get_direct_mem_ptr(i, trans, dmi_data);
        });
        target[i].register_transport_dbg([this, i](tlm::tlm_generic_payload& trans) -> unsigned { return this->transport_dbg(i, trans); });
        ibases[i] = 0ULL;
    }
    for(size_t i = 0; i < initiator.size(); ++i) {
        initiator[i].register_invalidate_direct_mem_ptr([this, i](::sc_dt::uint64 start_range, ::sc_dt::uint64 end_range) -> void {
            this->invalidate_direct_mem_ptr(i, start_range, end_range);
        });
        tranges[i].base = 0ULL;
        tranges[i].size = 0ULL;
        tranges[i].remap = false;
    }
}
 
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE>
void router<BUSWIDTH, TARGET_SOCKET_TYPE>::set_target_range(size_t idx, uint64_t base, uint64_t size, bool remap) {
    tranges[idx].base = base;
    tranges[idx].size = size;
    tranges[idx].remap = remap;
    addr_decoder.addEntry(idx, base, size);
    if(check_overlap_on_add_target)
        addr_decoder.validate();
}
 
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE>
void router<BUSWIDTH, TARGET_SOCKET_TYPE>::add_target_range(std::string name, uint64_t base, uint64_t size, bool remap) {
    auto it = target_name_lut.find(name);
#ifndef NDEBUG
#if(SYSTEMC_VERSION >= 20171012)
    if(it == target_name_lut.end()) {
        std::stringstream ss;
        ss << "No target index entry for '" << name << "' found ";
        ::sc_core::sc_assertion_failed(ss.str().c_str(), __FILE__, __LINE__);
    }
#else
    sc_assert(it != target_name_lut.end());
#endif
#endif
    auto idx = it->second;
    tranges[idx].base = base;
    tranges[idx].size = size;
    tranges[idx].remap = remap;
    addr_decoder.addEntry(idx, base, size);
    if(check_overlap_on_add_target)
        addr_decoder.validate();
}
 
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE>
void router<BUSWIDTH, TARGET_SOCKET_TYPE>::b_transport(int i, tlm::tlm_generic_payload& trans, sc_core::sc_time& delay) {
    ::sc_dt::uint64 address = trans.get_address();
    if(ibases[i]) {
        address += ibases[i];
        trans.set_address(address);
    }
    size_t idx = addr_decoder.getEntry(address);
    if(idx == addr_decoder.null_entry) {
        if(default_idx == std::numeric_limits<size_t>::max()) {
            if(warn_on_address_error) {
                SCCWARN(SCMOD) << "target address=0x" << std::hex << address << " not found for "
                               << (trans.get_command() == tlm::TLM_READ_COMMAND ? "read" : "write") << " transaction.";
            }
            trans.set_response_status(tlm::TLM_ADDRESS_ERROR_RESPONSE);
            return;
        }
        idx = default_idx;
    } else {
        // Modify address within transaction
        trans.set_address(address - (tranges[idx].remap ? tranges[idx].base : 0));
    }
    // Forward transaction to appropriate target
    mutexes[idx].lock();
    initiator[idx]->b_transport(trans, delay);
    mutexes[idx].unlock();
}
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE>
bool router<BUSWIDTH, TARGET_SOCKET_TYPE>::get_direct_mem_ptr(int i, tlm::tlm_generic_payload& trans, tlm::tlm_dmi& dmi_data) {
    ::sc_dt::uint64 address = trans.get_address();
    if(ibases[i]) {
        address += ibases[i];
        trans.set_address(address);
    }
    size_t idx = addr_decoder.getEntry(address);
    if(idx == addr_decoder.null_entry) {
        if(default_idx == std::numeric_limits<size_t>::max()) {
            if(warn_on_address_error) {
                SCCWARN(SCMOD) << "target address=0x" << std::hex << address << " not found for "
                               << (trans.get_command() == tlm::TLM_READ_COMMAND ? "read" : "write") << " transaction.";
            }
            trans.set_response_status(tlm::TLM_ADDRESS_ERROR_RESPONSE);
            return false;
        }
        idx = default_idx;
    }
    // Modify address within transaction
    auto offset = tranges[idx].remap ? tranges[idx].base : 0;
    trans.set_address(address - offset);
    bool status = initiator[idx]->get_direct_mem_ptr(trans, dmi_data);
    // make sure end address does not exceed size
    auto remap_end = (tranges[idx].remap ? 0 : tranges[idx].base) + tranges[idx].size;
    if(tranges[idx].size && dmi_data.get_end_address() >= remap_end)
        dmi_data.set_end_address(remap_end - 1);
    // Calculate DMI address of target in system address space
    dmi_data.set_start_address(dmi_data.get_start_address() - ibases[i] + offset);
    dmi_data.set_end_address(dmi_data.get_end_address() - ibases[i] + offset);
    return status;
}
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE>
unsigned router<BUSWIDTH, TARGET_SOCKET_TYPE>::transport_dbg(int i, tlm::tlm_generic_payload& trans) {
    ::sc_dt::uint64 address = trans.get_address();
    if(ibases[i]) {
        address += ibases[i];
        trans.set_address(address);
    }
    size_t idx = addr_decoder.getEntry(address);
    if(idx == addr_decoder.null_entry) {
        if(default_idx == std::numeric_limits<size_t>::max()) {
            if(warn_on_address_error) {
                SCCWARN(SCMOD) << "target address=0x" << std::hex << address << " not found for "
                               << (trans.get_command() == tlm::TLM_READ_COMMAND ? "read" : "write") << " transaction.";
            }
            trans.set_response_status(tlm::TLM_ADDRESS_ERROR_RESPONSE);
            return 0;
        }
        idx = default_idx;
    } else {
        // Modify address within transaction
        trans.set_address(address - (tranges[idx].remap ? tranges[idx].base : 0));
    }
    // Forward debug transaction to appropriate target
    return initiator[idx]->transport_dbg(trans);
}
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE>
void router<BUSWIDTH, TARGET_SOCKET_TYPE>::invalidate_direct_mem_ptr(int id, ::sc_dt::uint64 start_range, ::sc_dt::uint64 end_range) {
    // Reconstruct address range in system memory map
    ::sc_dt::uint64 bw_start_range = start_range;
    if(tranges[id].remap)
        bw_start_range += tranges[id].base;
    ::sc_dt::uint64 bw_end_range = end_range;
    if(tranges[id].remap)
        bw_end_range += tranges[id].base;
    for(size_t i = 0; i < target.size(); ++i) {
        target[i]->invalidate_direct_mem_ptr(bw_start_range - ibases[i], bw_end_range - ibases[i]);
    }
}
template <unsigned BUSWIDTH, typename TARGET_SOCKET_TYPE> void router<BUSWIDTH, TARGET_SOCKET_TYPE>::end_of_elaboration() {
    addr_decoder.validate();
}
 
} // namespace scc
 
#endif /* SYSC_AVR_ROUTER_H_ */