953 lines
37 KiB
C
Executable File
953 lines
37 KiB
C
Executable File
/*
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* This file contains MCC library API functions implementation
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*
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* Copyright (C) 2014-2015 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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*
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* SPDX-License-Identifier: GPL-2.0+ and/or BSD-3-Clause
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* The GPL-2.0+ license for this file can be found in the COPYING.GPL file
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* included with this distribution or at
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* http://www.gnu.org/licenses/gpl-2.0.html
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* The BSD-3-Clause License for this file can be found in the COPYING.BSD file
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* included with this distribution or at
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* http://opensource.org/licenses/BSD-3-Clause
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*/
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#include "mcc_config.h"
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#if (MCC_OS_USED == MCC_MQX)
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#include <string.h>
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#include "mcc_config.h"
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#include "mcc_common.h"
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#include "mcc_api.h"
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#include "mcc_mqx.h"
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#elif (MCC_OS_USED == MCC_LINUX)
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#include <linux/mcc_api.h>
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#include <linux/mcc_imx6sx.h>
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#include <linux/mcc_linux.h>
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#include <linux/imx_sema4.h>
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#endif
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const char * const init_string = MCC_INIT_STRING;
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const char * const version_string = MCC_VERSION_STRING;
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static int mcc_recv_common_part(MCC_ENDPOINT *endpoint, unsigned int timeout_ms, MCC_RECEIVE_LIST **list);
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static int mcc_get_buffer_internal(void **buffer, MCC_MEM_SIZE *buf_size, unsigned int timeout_ms);
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static int mcc_free_buffer_internal(void *buffer);
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/*!
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* \brief This function initializes the Multi Core Communication subsystem for a given node.
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*
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* This function should only be called once per node (once in MQX, once per a process in Linux).
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* It tries to initialize the bookkeeping structure when the init_string member of this structure
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* is not equal to MCC_INIT_STRING, i.e. when no other core had performed the initialization yet.
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* Note, that this way of bookkeeping data re-initialization protection is not powerful enough and
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* the user application should not rely on this method. Instead, the application should be designed
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* to unambiguously assign the core that will perform the MCC initialization.
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* Clear the shared memory before the first core is attempting to initialize the MCC
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* (in some cases MCC_INIT_STRING remains in the shared memory after the application reset and could
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* cause that the bookkeeping data structure is not initialized correctly).
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*
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* \param[in] node Node number that will be used in endpoints created by this process.
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*
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* \return MCC_SUCCESS
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* \return MCC_ERR_SEMAPHORE (semaphore handling error)
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* \return MCC_ERR_INT (interrupt registration error)
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* \return MCC_ERR_VERSION (incorrect MCC version used - compatibility issue)
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* \return MCC_ERR_OSSYNC (OS synchronization module(s) initialization failed)
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*
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* \see mcc_destroy
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* \see MCC_BOOKEEPING_STRUCT
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*/
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int mcc_initialize(MCC_NODE node)
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{
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int i,j = 0;
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int return_value = MCC_SUCCESS;
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MCC_SIGNAL tmp_signals_received = {(MCC_SIGNAL_TYPE)0, {(MCC_CORE)0, (MCC_NODE)0, (MCC_PORT)0}};
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/* Initialize synchronization module for shared data protection */
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return_value = mcc_init_semaphore(MCC_SHMEM_SEMAPHORE_NUMBER);
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Initialize all necessary OS synchronization module(s)
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(for unblocking tasks waiting for new received data and for unblocking tasks waiting for a free buffer) */
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return_value = mcc_init_os_sync();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Register CPU-to-CPU interrupt for inter-core signaling */
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//mcc_register_cpu_to_cpu_isr(MCC_CORE0_CPU_TO_CPU_VECTOR);
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return_value = mcc_register_cpu_to_cpu_isr();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Initialize the bookeeping structure */
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bookeeping_data = (MCC_BOOKEEPING_STRUCT *)mcc_get_bookeeping_data();
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MCC_DCACHE_INVALIDATE_MLINES(bookeeping_data, sizeof(MCC_BOOKEEPING_STRUCT));
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if(strcmp(bookeeping_data->init_string, init_string) != 0) {
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/* MCC not initialized yet, do it now */
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/* Zero it all - no guarantee Linux or uboot didnt touch it before it was reserved */
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memset((void*) bookeeping_data, 0, sizeof(struct mcc_bookeeping_struct));
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/* Set init_string in case it has not been set yet by another core */
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mcc_memcpy((void*)init_string, bookeeping_data->init_string, (unsigned int)sizeof(bookeeping_data->init_string));
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/* Set version_string */
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mcc_memcpy((void*)version_string, bookeeping_data->version_string, (unsigned int)sizeof(bookeeping_data->version_string));
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/* Initialize the free list */
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bookeeping_data->free_list.head = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(&bookeeping_data->r_buffers[0]);
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bookeeping_data->free_list.tail = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(&bookeeping_data->r_buffers[MCC_ATTR_NUM_RECEIVE_BUFFERS-1]);
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/* Initialize receive buffers */
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for(i=0; i<MCC_ATTR_NUM_RECEIVE_BUFFERS-1; i++) {
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bookeeping_data->r_buffers[i].next = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(&bookeeping_data->r_buffers[i+1]);
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}
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bookeeping_data->r_buffers[MCC_ATTR_NUM_RECEIVE_BUFFERS-1].next = null;
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/* Initialize signal queues */
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for(i=0; i<MCC_NUM_CORES; i++) {
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for(j=0; j<MCC_MAX_OUTSTANDING_SIGNALS; j++) {
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bookeeping_data->signals_received[i][j] = tmp_signals_received;
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}
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bookeeping_data->signal_queue_head[i] = 0;
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bookeeping_data->signal_queue_tail[i] = 0;
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}
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/* Mark all endpoint ports as free */
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for(i=0; i<MCC_ATTR_MAX_RECEIVE_ENDPOINTS; i++) {
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bookeeping_data->endpoint_table[i].endpoint.port = MCC_RESERVED_PORT_NUMBER;
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}
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}
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else {
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/* MCC already initialized - check the major number of the version string to ensure compatibility */
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if(strncmp(bookeeping_data->version_string, version_string, 4) != 0) {
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return_value = MCC_ERR_VERSION;
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}
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}
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MCC_DCACHE_FLUSH_MLINES(bookeeping_data, sizeof(MCC_BOOKEEPING_STRUCT));
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return return_value;
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}
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/*!
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* \brief This function de-initializes the Multi Core Communication subsystem for a given node.
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*
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* The function frees all resources of the node. Deletes all endpoints and frees any buffers that may have been queued there.
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*
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* \param[in] node Node number to be deinitialized.
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*
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* \return MCC_SUCCESS
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* \return MCC_ERR_SEMAPHORE (semaphore handling error)
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* \return MCC_ERR_OSSYNC (OS synchronization module(s) deinitialization failed)
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*
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* \see mcc_initialize
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*/
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int mcc_destroy(MCC_NODE node)
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{
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int i = 0, return_value;
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/* Semaphore-protected section start */
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return_value = mcc_get_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* All endpoints of the particular node have to be removed from the endpoint table */
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MCC_DCACHE_INVALIDATE_MLINES(&bookeeping_data->endpoint_table[0], MCC_ATTR_MAX_RECEIVE_ENDPOINTS * sizeof(MCC_ENDPOINT_MAP_ITEM));
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for(i = 0; i < MCC_ATTR_MAX_RECEIVE_ENDPOINTS; i++) {
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if (bookeeping_data->endpoint_table[i].endpoint.node == node) {
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/* Remove the endpoint from the table */
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mcc_remove_endpoint(bookeeping_data->endpoint_table[i].endpoint);
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}
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}
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/* Semaphore-protected section end */
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return_value = mcc_release_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Deinitialize synchronization module */
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mcc_deinit_semaphore(MCC_SHMEM_SEMAPHORE_NUMBER);
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/* De-initialize OS synchronization module(s)
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(for unblocking tasks waiting for new data and for unblocking tasks waiting for a free buffer */
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return_value = mcc_deinit_os_sync();
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if(return_value != MCC_SUCCESS)
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return return_value;
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return return_value;
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}
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/*!
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* \brief This function creates an endpoint.
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*
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* The function creates an endpoint on the local node with the specified port number.
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* The core and node provided in the endpoint must match the caller's core and
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* node, and the port argument must match the endpoint port.
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*
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* \param[out] endpoint Pointer to the endpoint triplet to be created.
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* \param[in] port Port number.
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*
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* \return MCC_SUCCESS
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* \return MCC_ERR_NOMEM (maximum number of endpoints exceeded)
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* \return MCC_ERR_ENDPOINT (invalid value for port or endpoint already registered)
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* \return MCC_ERR_SEMAPHORE (semaphore handling error)
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*
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* \see mcc_destroy_endpoint
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* \see MCC_ENDPOINT
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*/
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int mcc_create_endpoint(MCC_ENDPOINT *endpoint, MCC_PORT port)
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{
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int return_value = MCC_SUCCESS;
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/* Fill the endpoint structure */
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endpoint->core = (MCC_CORE)MCC_CORE_NUMBER;
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endpoint->node = (MCC_NODE)MCC_NODE_NUMBER;
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endpoint->port = (MCC_PORT)port;
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/* Semaphore-protected section start */
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return_value = mcc_get_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Add new endpoint data into the book-keeping structure */
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return_value = mcc_register_endpoint(*endpoint);
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if(return_value != MCC_SUCCESS) {
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mcc_release_semaphore();
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return return_value;
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}
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/* Semaphore-protected section end */
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return_value = mcc_release_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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return return_value;
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}
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/*!
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* \brief This function destroys an endpoint.
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*
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* The function destroys an endpoint on the local node and frees any buffers that may be queued.
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*
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* \param[in] endpoint Pointer to the endpoint triplet to be deleted.
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*
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* \return MCC_SUCCESS
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* \return MCC_ERR_ENDPOINT (the endpoint doesn't exist)
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* \return MCC_ERR_SEMAPHORE (semaphore handling error)
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*
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* \see mcc_create_endpoint
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* \see MCC_ENDPOINT
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*/
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int mcc_destroy_endpoint(MCC_ENDPOINT *endpoint)
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{
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int return_value = MCC_SUCCESS;
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/* Semaphore-protected section start */
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return_value = mcc_get_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Remove the endpoint data from the book-keeping structure */
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return_value = mcc_remove_endpoint(*endpoint);
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if(return_value != MCC_SUCCESS) {
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mcc_release_semaphore();
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return return_value;
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}
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/* Clear OS synchronization module parts associated with the endpoint to be destroyed */
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mcc_clear_os_sync_for_ep(endpoint);
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/* Semaphore-protected section end */
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return_value = mcc_release_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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return return_value;
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}
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/*!
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* \brief This function sends a message to an endpoint.
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*
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* The message is copied into the MCC buffer and the destination core is signaled.
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*
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* \param[in] src_endpoint Pointer to the local endpoint identifying the source endpoint.
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* \param[in] dest_endpoint Pointer to the destination endpoint to send the message to.
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* \param[in] msg Pointer to the message to be sent.
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* \param[in] msg_size Size of the message to be sent in bytes.
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* \param[in] timeout_ms Timeout, in milliseconds, to wait for a free buffer. A value of 0 means don't wait (non-blocking call). A value of 0xffffffff means wait forever (blocking call).
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*
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* \return MCC_SUCCESS
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* \return MCC_ERR_ENDPOINT (the endpoint does not exist)
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* \return MCC_ERR_SEMAPHORE (semaphore handling error)
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* \return MCC_ERR_INVAL (the msg_size exceeds the size of a data buffer)
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* \return MCC_ERR_TIMEOUT (timeout exceeded before a buffer became available)
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* \return MCC_ERR_NOMEM (no free buffer available and timeout_ms set to 0)
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* \return MCC_ERR_SQ_FULL (signal queue is full)
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*
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* \see mcc_recv
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* \see mcc_recv_nocopy
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* \see MCC_ENDPOINT
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*/
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int mcc_send(MCC_ENDPOINT *src_endpoint, MCC_ENDPOINT *dest_endpoint, void *msg, MCC_MEM_SIZE msg_size, unsigned int timeout_ms)
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{
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int return_value;
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MCC_RECEIVE_LIST *list;
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MCC_RECEIVE_BUFFER * buf;
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MCC_SIGNAL affiliated_signal;
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MCC_MEM_SIZE buffer_size;
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/* Reuse the mcc_get_buffer_internal() function to get the MCC buffer pointer. */
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return_value = mcc_get_buffer_internal((void**)&buf, &buffer_size, timeout_ms);
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Check if the size of the message to be sent does not exceed the size of the mcc buffer */
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if(msg_size > buffer_size) {
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while(MCC_SUCCESS != mcc_free_buffer_internal(buf)) {};
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return MCC_ERR_INVAL;
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}
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/* Semaphore-protected section start */
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return_value = mcc_get_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* As the mcc_get_buffer_internal() returns the pointer to the data field, it
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is necessary to adjust the pointer to point at the MCC buffer structure beginning. */
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buf = (MCC_RECEIVE_BUFFER *)((unsigned int)buf - (unsigned int)(&(((MCC_RECEIVE_BUFFER*)0)->data)));
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/* Copy the message into the MCC receive buffer */
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MCC_DCACHE_INVALIDATE_MLINES((void*)buf, sizeof(MCC_RECEIVE_BUFFER));
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mcc_memcpy(msg, (void*)buf->data, (unsigned int)msg_size);
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mcc_memcpy((void*)src_endpoint, (void*)&buf->source, sizeof(MCC_ENDPOINT));
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buf->data_len = msg_size;
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MCC_DCACHE_FLUSH_MLINES((void*)buf, sizeof(MCC_RECEIVE_BUFFER));
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/* Get list of buffers kept by the particular endpoint */
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list = mcc_get_endpoint_list(*dest_endpoint);
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if(list == null) {
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/* The endpoint does not exists (has not been registered so far),
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free the buffer and return immediately - error */
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/* Enqueue the buffer back into the free list */
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MCC_DCACHE_INVALIDATE_MLINES((void*)&bookeeping_data->free_list, sizeof(MCC_RECEIVE_LIST*));
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mcc_queue_buffer(&bookeeping_data->free_list, buf);
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mcc_release_semaphore();
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return MCC_ERR_ENDPOINT;
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}
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/* Write the signal type into the signal queue of the particular core */
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affiliated_signal.type = BUFFER_QUEUED;
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affiliated_signal.destination = *dest_endpoint;
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return_value = mcc_queue_signal(dest_endpoint->core, affiliated_signal);
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if(return_value != MCC_SUCCESS) {
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/* Signal queue is full, free the buffer and return immediately - error */
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MCC_DCACHE_INVALIDATE_MLINES((void*)&bookeeping_data->free_list, sizeof(MCC_RECEIVE_LIST*));
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mcc_queue_buffer(&bookeeping_data->free_list, buf);
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mcc_release_semaphore();
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return return_value;
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}
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/* Enqueue the buffer into the endpoint buffer list */
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mcc_queue_buffer(list, buf);
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/* Semaphore-protected section end */
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return_value = mcc_release_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Signal the other core by generating the CPU-to-CPU interrupt */
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return_value = mcc_generate_cpu_to_cpu_interrupt();
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return return_value;
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}
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/*!
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* \private
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*
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* \brief This function dequeues a buffer from the free list.
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*
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* This is an internal implementation of the mcc_get_buffer() function. It is called
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* either from the mcc_send() or from mcc_get_buffer() when the non-copy-send
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* mechanism is enabled by the MCC_SEND_RECV_NOCOPY_API_ENABLED macro in mcc_config.h.
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*
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* \param[out] buffer Pointer to the MCC buffer dequeued from the free list.
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* \param[out] buf_size Pointer to an MCC_MEM_SIZE that is used for passing the size of the dequeued MCC buffer to the application.
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* \param[in] timeout_ms Timeout, in milliseconds, to wait for a free buffer. A value of 0 means don't wait (non-blocking call). A value of 0xffffffff means wait forever (blocking call).
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*
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* \return MCC_SUCCESS
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* \return MCC_ERR_SEMAPHORE (semaphore handling error)
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* \return MCC_ERR_TIMEOUT (timeout exceeded before a buffer became available)
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* \return MCC_ERR_NOMEM (no free buffer available and timeout_ms set to 0)
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*
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* \see mcc_send_nocopy
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* \see mcc_send
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* \see mcc_get_buffer
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*/
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static int mcc_get_buffer_internal(void **buffer, MCC_MEM_SIZE *buf_size, unsigned int timeout_ms)
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{
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int return_value;
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MCC_RECEIVE_BUFFER * buf = null;
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*buffer = null;
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/* Semaphore-protected section start */
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return_value = mcc_get_semaphore();
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if(return_value != MCC_SUCCESS)
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return return_value;
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/* Dequeue the buffer from the free list */
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MCC_DCACHE_INVALIDATE_MLINES((void*)&bookeeping_data->free_list, sizeof(MCC_RECEIVE_LIST*));
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buf = mcc_dequeue_buffer(&bookeeping_data->free_list);
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/* Semaphore-protected section end */
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mcc_release_semaphore();
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if(buf == null) {
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/* Non-blocking call */
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if(timeout_ms == 0) {
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return MCC_ERR_NOMEM;
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} else {
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/* Wait for the buffer freed event */
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return_value = mcc_wait_for_buffer_freed((MCC_RECEIVE_BUFFER **)&buf, timeout_ms);
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if(MCC_SUCCESS != return_value) {
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return return_value;
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}
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}
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}
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/* Return the MCC buffer size and the pointer to the dequeued MCC buffer */
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*buf_size = (MCC_MEM_SIZE)sizeof(bookeeping_data->r_buffers[0].data);
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*buffer = (void*)buf->data;
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return MCC_SUCCESS;
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}
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#if MCC_SEND_RECV_NOCOPY_API_ENABLED
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/*!
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* \brief This function dequeues a buffer from the free list.
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*
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* The application has take the responsibility for MCC buffer de-allocation and
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|
* filling the data to be sent into the pre-allocated MCC buffer.
|
|
*
|
|
* \param[out] buffer Pointer to the MCC buffer dequeued from the free list.
|
|
* \param[out] buf_size Pointer to an MCC_MEM_SIZE that is used for passing the size of the dequeued MCC buffer to the application.
|
|
* \param[in] timeout_ms Timeout, in milliseconds, to wait for a free buffer. A value of 0 means don't wait (non-blocking call). A value of 0xffffffff means wait forever (blocking call).
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
* \return MCC_ERR_TIMEOUT (timeout exceeded before a buffer became available)
|
|
* \return MCC_ERR_NOMEM (no free buffer available and timeout_ms set to 0)
|
|
*
|
|
* \see mcc_send_nocopy
|
|
*/
|
|
int mcc_get_buffer(void **buffer, MCC_MEM_SIZE *buf_size, unsigned int timeout_ms)
|
|
{
|
|
return mcc_get_buffer_internal(buffer, buf_size, timeout_ms);
|
|
}
|
|
|
|
/*!
|
|
* \brief This function sends a message to an endpoint. The data is NOT copied
|
|
* from the user-app. buffer but the pointer to already filled message buffer is
|
|
* provided.
|
|
*
|
|
* The application has to take the responsibility for:
|
|
* 1. MCC buffer de-allocation
|
|
* 2. filling the data to be sent into the pre-allocated MCC buffer
|
|
* 3. not exceeding the buffer size when filling the data (MCC_ATTR_BUFFER_SIZE_IN_BYTES)
|
|
*
|
|
* Once the data cache is used on the target platform it is good to have MCC buffers
|
|
* in shared RAM aligned to the cache line size in order not to corrupt entities placed
|
|
* just before and just after the MCC buffer when flushing the MCC buffer content into
|
|
* the shared RAM. It is also the application responsibility to flush the data in
|
|
* that case. If the alignment condition is not fulfilled the application
|
|
* has to take care about the data cache coherency.
|
|
* The following scenarios can happen:
|
|
* A. Data cache is OFF:
|
|
* - No cache operation needs to be done, the application just
|
|
* 1. calls the mcc_get_buffer() function,
|
|
* 2. fills data into the provided MCC buffer,
|
|
* 3. and finally issues the mcc_send_nocopy() function.
|
|
* B. Data cache is ON, shared RAM MCC buffers ALIGNED to the cache line size:
|
|
* - The application has to perform following steps:
|
|
* 1. call the mcc_get_buffer() to get the pointer to a free message buffer
|
|
* 2. copy data to be sent into the message buffer
|
|
* 3. flush all cache lines occupied by the message buffer new data
|
|
* (maximum of MCC_ATTR_BUFFER_SIZE_IN_BYTES bytes).
|
|
* 4. call the mcc_send_nocopy() with the correct buffer pointer and the message size passed
|
|
* C. Data cache is ON, shared RAM MCC buffers NOT ALIGNED:
|
|
* - The application has to perform following steps:
|
|
* 1. call the mcc_get_buffer() to get the pointer to a free message buffer
|
|
* 2. grab the hw semaphore by calling the mcc_get_semaphore() low level MCC function.
|
|
* 3. invalidate all cache lines occupied by data to be filled into the free message buffer.
|
|
* (maximum of MCC_ATTR_BUFFER_SIZE_IN_BYTES bytes).
|
|
* 4. copy data to be sent into the message buffer.
|
|
* 5. flush all cache lines occupied by the message buffer new data
|
|
* (maximum of MCC_ATTR_BUFFER_SIZE_IN_BYTES bytes).
|
|
* 6. release the hw semaphore by calling the mcc_release_semaphore() low level MCC function.
|
|
* 7. call the mcc_send_nocopy() with the correct buffer pointer and the message size passed.
|
|
*
|
|
* After the mcc_send_nocopy() function is issued the message buffer is no more owned
|
|
* by the sending task and must not be touched anymore unless the mcc_send_nocopy()
|
|
* function fails and returns an error. In that case the application should try
|
|
* to re-issue the mcc_send_nocopy() again and if it is still not possible to send
|
|
* the message and the application wants to give it up from whatever reasons
|
|
* (for instance the MCC_ERR_ENDPOINT error is returned meaning the endpoint
|
|
* has not been created yet) the mcc_free_buffer() function could be called,
|
|
* passing the pointer to the buffer to be freed as a parameter.
|
|
*
|
|
* \param[in] src_endpoint Pointer to the local endpoint identifying the source endpoint.
|
|
* \param[in] dest_endpoint Pointer to the destination endpoint to send the message to.
|
|
* \param[in] buffer_p Pointer to the MCC buffer of the shared memory where the
|
|
* data to be sent is stored.
|
|
* \param[in] msg_size Size of the message to be sent in bytes.
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_INVAL (the msg_size exceeds the size of a data buffer)
|
|
* \return MCC_ERR_ENDPOINT (the endpoint does not exist)
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
* \return MCC_ERR_SQ_FULL (signal queue is full)
|
|
*
|
|
* \see mcc_send
|
|
* \see mcc_get_buffer
|
|
* \see MCC_ENDPOINT
|
|
*/
|
|
int mcc_send_nocopy(MCC_ENDPOINT *src_endpoint, MCC_ENDPOINT *dest_endpoint, void *buffer_p, MCC_MEM_SIZE msg_size)
|
|
{
|
|
int return_value;
|
|
MCC_RECEIVE_BUFFER * buf;
|
|
MCC_RECEIVE_LIST *list;
|
|
MCC_SIGNAL affiliated_signal;
|
|
|
|
/* Check if the size of the message to be sent does not exceed the size of the mcc buffer */
|
|
if(msg_size > sizeof(bookeeping_data->r_buffers[0].data)) {
|
|
return MCC_ERR_INVAL;
|
|
}
|
|
|
|
/* Semaphore-protected section start */
|
|
return_value = mcc_get_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* Get list of buffers kept by the particular endpoint */
|
|
list = mcc_get_endpoint_list(*dest_endpoint);
|
|
|
|
if(list == null) {
|
|
/* The endpoint does not exists (has not been registered so far) */
|
|
mcc_release_semaphore();
|
|
return MCC_ERR_ENDPOINT;
|
|
}
|
|
|
|
/* Store the message size and the source endpoint in the MCC_RECEIVE_BUFFER structure */
|
|
buf = (MCC_RECEIVE_BUFFER *)((unsigned int)buffer_p - (unsigned int)(&(((MCC_RECEIVE_BUFFER*)0)->data)));
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&buf->source, sizeof(MCC_ENDPOINT) + sizeof(MCC_MEM_SIZE));
|
|
((MCC_RECEIVE_BUFFER*)buf)->data_len = msg_size;
|
|
mcc_memcpy((void*)src_endpoint, (void*)&buf->source, sizeof(MCC_ENDPOINT));
|
|
MCC_DCACHE_FLUSH_MLINES((void*)(void*)&buf->source, sizeof(MCC_ENDPOINT) + sizeof(MCC_MEM_SIZE));
|
|
|
|
|
|
/* Write the signal type into the signal queue of the particular core */
|
|
affiliated_signal.type = BUFFER_QUEUED;
|
|
affiliated_signal.destination = *dest_endpoint;
|
|
return_value = mcc_queue_signal(dest_endpoint->core, affiliated_signal);
|
|
if(return_value != MCC_SUCCESS) {
|
|
/* Signal queue is full - error */
|
|
mcc_release_semaphore();
|
|
return return_value;
|
|
}
|
|
|
|
/* Enqueue the buffer into the endpoint buffer list */
|
|
mcc_queue_buffer(list, (MCC_RECEIVE_BUFFER*)buf);
|
|
|
|
/* Semaphore-protected section end */
|
|
mcc_release_semaphore();
|
|
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* Signal the other core by generating the CPU-to-CPU interrupt */
|
|
return_value = mcc_generate_cpu_to_cpu_interrupt();
|
|
|
|
return return_value;
|
|
}
|
|
#endif /* MCC_SEND_RECV_NOCOPY_API_ENABLED */
|
|
|
|
/*!
|
|
* \brief This function receives a message from the specified endpoint if one is available.
|
|
* The data is copied from the receive buffer into the user supplied buffer.
|
|
*
|
|
* This is the "receive with copy" version of the MCC receive function. This version is simple
|
|
* to use but it requires copying data from shared memory into the user space buffer.
|
|
* The user has no obligation or burden to manage the shared memory buffers.
|
|
*
|
|
* \param[out] src_endpoint Pointer to the MCC_ENDPOINT structure to be filled by the endpoint identifying the message sender.
|
|
* \param[in] dest_endpoint Pointer to the local receiving endpoint to receive from.
|
|
* \param[in] buffer Pointer to the user-app. buffer where data will be copied into.
|
|
* \param[in] buffer_size The maximum number of bytes to copy.
|
|
* \param[out] recv_size Pointer to an MCC_MEM_SIZE that will contain the number of bytes actually copied into the buffer.
|
|
* \param[in] timeout_ms Timeout, in milliseconds, to wait for a free buffer. A value of 0 means don't wait (non-blocking call). A value of 0xffffffff means wait forever (blocking call).
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_ENDPOINT (the endpoint does not exist)
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
* \return MCC_ERR_TIMEOUT (timeout exceeded before a new message came)
|
|
*
|
|
* \see mcc_send
|
|
* \see mcc_recv_nocopy
|
|
* \see MCC_ENDPOINT
|
|
*/
|
|
int mcc_recv(MCC_ENDPOINT *src_endpoint, MCC_ENDPOINT *dest_endpoint, void *buffer, MCC_MEM_SIZE buffer_size, MCC_MEM_SIZE *recv_size, unsigned int timeout_ms)
|
|
{
|
|
MCC_RECEIVE_LIST *list = null;
|
|
MCC_RECEIVE_BUFFER * buf;
|
|
MCC_SIGNAL affiliated_signal;
|
|
MCC_ENDPOINT tmp_destination = {(MCC_CORE)0, (MCC_NODE)0, (MCC_PORT)0};
|
|
int return_value, i = 0;
|
|
|
|
return_value = mcc_recv_common_part(dest_endpoint, timeout_ms, (MCC_RECEIVE_LIST**)&list);
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* Semaphore-protected section start */
|
|
return_value = mcc_get_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)list, sizeof(MCC_RECEIVE_LIST*));
|
|
|
|
if(list->head == (MCC_RECEIVE_BUFFER*)0) {
|
|
/* Buffer not dequeued before the timeout */
|
|
mcc_release_semaphore();
|
|
return MCC_ERR_TIMEOUT;
|
|
}
|
|
|
|
/* Copy the message from the MCC receive buffer into the user-app. buffer */
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&list->head->source, sizeof(MCC_ENDPOINT) + sizeof(MCC_MEM_SIZE));
|
|
mcc_memcpy((void*)&list->head->source, (void*)src_endpoint, sizeof(MCC_ENDPOINT));
|
|
if (list->head->data_len > buffer_size) {
|
|
list->head->data_len = buffer_size;
|
|
}
|
|
*recv_size = (MCC_MEM_SIZE)(list->head->data_len);
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&list->head->data, list->head->data_len);
|
|
mcc_memcpy((void*)list->head->data, buffer, list->head->data_len);
|
|
|
|
/* Dequeue the buffer from the endpoint list */
|
|
list->head = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(list->head);
|
|
buf = mcc_dequeue_buffer(list);
|
|
|
|
/* Enqueue the buffer into the free list */
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&bookeeping_data->free_list, sizeof(MCC_RECEIVE_LIST*));
|
|
mcc_queue_buffer(&bookeeping_data->free_list, buf);
|
|
|
|
/* Notify all cores (except of itself) via CPU-to-CPU interrupt that a buffer has been freed */
|
|
affiliated_signal.type = BUFFER_FREED;
|
|
affiliated_signal.destination = tmp_destination;
|
|
for (i=0; i<MCC_NUM_CORES; i++) {
|
|
if(i != MCC_CORE_NUMBER) {
|
|
mcc_queue_signal(i, affiliated_signal);
|
|
}
|
|
}
|
|
|
|
/* Semaphore-protected section end */
|
|
return_value = mcc_release_semaphore();
|
|
|
|
mcc_generate_cpu_to_cpu_interrupt();
|
|
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
return return_value;
|
|
}
|
|
|
|
#if MCC_SEND_RECV_NOCOPY_API_ENABLED
|
|
/*!
|
|
* \brief This function receives a message from the specified endpoint if one is available. The data is NOT copied into the user-app. buffer.
|
|
*
|
|
* This is the "zero-copy receive" version of the MCC receive function. No data is copied.
|
|
* Only the pointer to the data is returned. This version is fast, but it requires the user to manage
|
|
* buffer allocation. Specifically, the user must decide when a buffer is no longer in use and
|
|
* make the appropriate API call to free it, see mcc_free_buffer.
|
|
*
|
|
* \param[out] src_endpoint Pointer to the MCC_ENDPOINT structure to be filled by the endpoint identifying the message sender.
|
|
* \param[in] dest_endpoint Pointer to the local receiving endpoint to receive from.
|
|
* \param[out] buffer_p Pointer to the MCC buffer of the shared memory where the received data is stored.
|
|
* \param[out] recv_size Pointer to an MCC_MEM_SIZE that will contain the number of valid bytes in the buffer.
|
|
* \param[in] timeout_ms Timeout, in milliseconds, to wait for a free buffer. A value of 0 means don't wait (non-blocking call). A value of 0xffffffff means wait forever (blocking call).
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_ENDPOINT (the endpoint does not exist)
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
* \return MCC_ERR_TIMEOUT (timeout exceeded before a new message came)
|
|
*
|
|
* \see mcc_send
|
|
* \see mcc_recv
|
|
* \see MCC_ENDPOINT
|
|
*/
|
|
int mcc_recv_nocopy(MCC_ENDPOINT *src_endpoint, MCC_ENDPOINT *dest_endpoint, void **buffer_p, MCC_MEM_SIZE *recv_size, unsigned int timeout_ms)
|
|
{
|
|
MCC_RECEIVE_LIST *list = null;
|
|
int return_value;
|
|
|
|
return_value = mcc_recv_common_part(dest_endpoint, timeout_ms, (MCC_RECEIVE_LIST**)&list);
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* Semaphore-protected section start */
|
|
return_value = mcc_get_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)list, sizeof(MCC_RECEIVE_LIST*));
|
|
|
|
if(list->head == (MCC_RECEIVE_BUFFER*)0) {
|
|
/* Buffer not dequeued before the timeout */
|
|
mcc_release_semaphore();
|
|
return MCC_ERR_TIMEOUT;
|
|
}
|
|
|
|
/* Get the message pointer from the head of the receive buffer list */
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&list->head->data, list->head->data_len);
|
|
*buffer_p = (void*)&list->head->data;
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&list->head->source, sizeof(MCC_ENDPOINT) + sizeof(MCC_MEM_SIZE));
|
|
mcc_memcpy((void*)&list->head->source, (void*)src_endpoint, sizeof(MCC_ENDPOINT));
|
|
*recv_size = (MCC_MEM_SIZE)(list->head->data_len);
|
|
|
|
/* Dequeue the buffer from the endpoint list */
|
|
list->head = (MCC_RECEIVE_BUFFER*)MCC_MEM_VIRT_TO_PHYS(list->head);
|
|
mcc_dequeue_buffer(list);
|
|
|
|
/* Semaphore-protected section end */
|
|
return_value = mcc_release_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
return return_value;
|
|
}
|
|
#endif /* MCC_SEND_RECV_NOCOPY_API_ENABLED */
|
|
|
|
/*!
|
|
* \private
|
|
*
|
|
* \brief This function is common part for mcc_recv() and mcc_recv_nocopy() function.
|
|
*
|
|
* It tries to get the list of buffers kept by the particular endpoint. If the list is empty
|
|
* it waits for a new message until the timeout expires.
|
|
*
|
|
* \param[in] endpoint Pointer to the receiving endpoint to receive from.
|
|
* \param[in] timeout_ms Timeout, in milliseconds, to wait for a free buffer. A value of 0 means don't wait (non-blocking call). A value of 0xffffffff means wait forever (blocking call).
|
|
* \param[out] list Pointer to the list of buffers kept by the particular endpoint.
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_ENDPOINT (the endpoint does not exist)
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
* \return MCC_ERR_TIMEOUT (timeout exceeded before a new message came)
|
|
*
|
|
* \see mcc_recv
|
|
* \see mcc_recv_nocopy
|
|
* \see MCC_ENDPOINT
|
|
*/
|
|
static int mcc_recv_common_part(MCC_ENDPOINT *endpoint, unsigned int timeout_ms, MCC_RECEIVE_LIST **list)
|
|
{
|
|
MCC_RECEIVE_LIST *tmp_list;
|
|
int return_value;
|
|
|
|
/* Semaphore-protected section start */
|
|
return_value = mcc_get_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* Get list of buffers kept by the particular endpoint */
|
|
tmp_list = mcc_get_endpoint_list(*endpoint);
|
|
|
|
/* Semaphore-protected section end */
|
|
return_value = mcc_release_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* The endpoint is not valid */
|
|
if(tmp_list == null) {
|
|
return MCC_ERR_ENDPOINT;
|
|
}
|
|
|
|
if(tmp_list->head == (MCC_RECEIVE_BUFFER*)0) {
|
|
/* Non-blocking call */
|
|
if(timeout_ms == 0) {
|
|
return MCC_ERR_TIMEOUT;
|
|
}
|
|
/* Blocking call */
|
|
else {
|
|
/* Wait for the buffer queued event */
|
|
return_value = mcc_wait_for_buffer_queued(endpoint, timeout_ms);
|
|
if(MCC_SUCCESS != return_value) {
|
|
return return_value;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
tmp_list->head = (MCC_RECEIVE_BUFFER*)MCC_MEM_PHYS_TO_VIRT(tmp_list->head);
|
|
}
|
|
/* Clear event bit specified for the particular endpoint */
|
|
mcc_clear_os_sync_for_ep(endpoint);
|
|
|
|
*list = (MCC_RECEIVE_LIST*)tmp_list;
|
|
return MCC_SUCCESS;
|
|
}
|
|
|
|
/*!
|
|
* \brief This function returns the number of buffers currently queued at the endpoint.
|
|
*
|
|
* The function checks if messages are available on a receive endpoint. While the call only checks the
|
|
* availability of messages, it does not dequeue them.
|
|
*
|
|
* \param[in] endpoint Pointer to the endpoint structure.
|
|
* \param[out] num_msgs Pointer to an unsigned int that will contain the number of buffers queued.
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_ENDPOINT (the endpoint does not exist)
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
*
|
|
* \see mcc_recv
|
|
* \see mcc_recv_nocopy
|
|
* \see MCC_ENDPOINT
|
|
*/
|
|
int mcc_msgs_available(MCC_ENDPOINT *endpoint, unsigned int *num_msgs)
|
|
{
|
|
unsigned int count = 0;
|
|
MCC_RECEIVE_LIST *list;
|
|
MCC_RECEIVE_BUFFER * buf;
|
|
int return_value;
|
|
|
|
/* Semaphore-protected section start */
|
|
return_value = mcc_get_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* Get list of buffers kept by the particular endpoint */
|
|
list = mcc_get_endpoint_list(*endpoint);
|
|
if(list == null) {
|
|
/* The endpoint does not exists (has not been registered so far), return immediately - error */
|
|
mcc_release_semaphore();
|
|
return MCC_ERR_ENDPOINT;
|
|
}
|
|
|
|
buf = MCC_MEM_PHYS_TO_VIRT(list->head);
|
|
while(buf != (MCC_RECEIVE_BUFFER*)0) {
|
|
count++;
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&buf->next, sizeof(MCC_RECEIVE_BUFFER*));
|
|
buf = (MCC_RECEIVE_BUFFER*)MCC_MEM_PHYS_TO_VIRT(buf->next);
|
|
}
|
|
*num_msgs = count;
|
|
|
|
/* Semaphore-protected section end */
|
|
return_value = mcc_release_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
return return_value;
|
|
}
|
|
|
|
/*!
|
|
* \private
|
|
*
|
|
* \brief This function frees a buffer previously returned by mcc_recv_nocopy().
|
|
*
|
|
* Once the zero-copy mechanism of receiving data is used, this function
|
|
* has to be called to free a buffer and to make it available for the next data
|
|
* transfer.
|
|
*
|
|
* \param[in] buffer Pointer to the buffer to be freed.
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
*
|
|
* \see mcc_recv_nocopy
|
|
*/
|
|
static int mcc_free_buffer_internal(void *buffer)
|
|
{
|
|
MCC_SIGNAL affiliated_signal;
|
|
MCC_ENDPOINT tmp_destination = {(MCC_CORE)0, (MCC_NODE)0, (MCC_PORT)0};
|
|
int return_value, i = 0;
|
|
|
|
/* Semaphore-protected section start */
|
|
return_value = mcc_get_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
/* Enqueue the buffer into the free list */
|
|
MCC_DCACHE_INVALIDATE_MLINES((void*)&bookeeping_data->free_list, sizeof(MCC_RECEIVE_LIST*));
|
|
mcc_queue_buffer(&bookeeping_data->free_list, (MCC_RECEIVE_BUFFER *)((unsigned int)buffer - (unsigned int)(&(((MCC_RECEIVE_BUFFER*)0)->data))));
|
|
|
|
/* Notify all cores (except of itself) via CPU-to-CPU interrupt that a buffer has been freed */
|
|
affiliated_signal.type = BUFFER_FREED;
|
|
affiliated_signal.destination = tmp_destination;
|
|
for (i=0; i<MCC_NUM_CORES; i++) {
|
|
if(i != MCC_CORE_NUMBER) {
|
|
mcc_queue_signal(i, affiliated_signal);
|
|
}
|
|
}
|
|
|
|
/* Semaphore-protected section end */
|
|
return_value = mcc_release_semaphore();
|
|
|
|
mcc_generate_cpu_to_cpu_interrupt();
|
|
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
return return_value;
|
|
}
|
|
#if MCC_SEND_RECV_NOCOPY_API_ENABLED
|
|
/*!
|
|
* \brief This function frees a buffer previously returned by mcc_recv_nocopy().
|
|
*
|
|
* Once the zero-copy mechanism of receiving data is used, this function
|
|
* has to be called to free a buffer and to make it available for the next data
|
|
* transfer.
|
|
*
|
|
* \param[in] buffer Pointer to the buffer to be freed.
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
*
|
|
* \see mcc_recv_nocopy
|
|
*/
|
|
int mcc_free_buffer(void *buffer)
|
|
{
|
|
return mcc_free_buffer_internal(buffer);
|
|
}
|
|
#endif /* MCC_SEND_RECV_NOCOPY_API_ENABLED */
|
|
|
|
/*!
|
|
* \brief This function returns information about the MCC sub system.
|
|
*
|
|
* The function returns implementation-specific information.
|
|
*
|
|
* \param[in] node Node number.
|
|
* \param[out] info_data Pointer to the MCC_INFO_STRUCT structure to hold returned data.
|
|
*
|
|
* \return MCC_SUCCESS
|
|
* \return MCC_ERR_SEMAPHORE (semaphore handling error)
|
|
*
|
|
* \see MCC_INFO_STRUCT
|
|
*/
|
|
int mcc_get_info(MCC_NODE node, MCC_INFO_STRUCT* info_data)
|
|
{
|
|
int return_value;
|
|
|
|
/* Semaphore-protected section start */
|
|
return_value = mcc_get_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
mcc_memcpy(bookeeping_data->version_string, (void*)info_data->version_string, (unsigned int)sizeof(bookeeping_data->version_string));
|
|
|
|
/* Semaphore-protected section end */
|
|
return_value = mcc_release_semaphore();
|
|
if(return_value != MCC_SUCCESS)
|
|
return return_value;
|
|
|
|
return return_value;
|
|
}
|