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view src/cs/services/etm/etm_env.c @ 220:0ed36de51973

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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents 4e78acac3d88
children
line wrap: on
line source

/********************************************************************************
 * Enhanced TestMode (ETM)
 * @file    etm_env.c 
 *
 * @author  Kim T. Peteren (ktp@ti.com)
 * @version 0.1
 *

 *
 * History:
 *
 *  Date        Modification
 *  ------------------------------------
 *  16/06/2003  Creation
 *
 * (C) Copyright 2003 by Texas Instruments Incorporated, All Rights Reserved
 *********************************************************************************/


#include "etm/etm_env.h"

#include "rvm/rvm_priorities.h"
#include "rvm/rvm_use_id_list.h"
#include "rv/rv_defined_swe.h"

#include <string.h>
/******************************************************************************
 * 
 *****************************************************************************/

/* External declaration */
extern T_RV_RET etm_task(void);


/**
 * Pointer on the structure gathering all the global variables
 * used by ETM instance.
 */
T_ETM_ENV_CTRL_BLK *etm_env_ctrl_blk = NULL;

/* FreeCalypso addition */
int etm_is_running;


/******************************************************************************
* Function    : etm_get_info
*
* Description : This function is called by the RV manager to learn 
*               driver requirements in terms of memory, SWEs...
*
* Parameters  : T_RVM_INFO_SWE  * swe_info: pointer to the structure to fill
*               containing infos related to the driver SWE.
*
* Return      :  T_RVM_RETURN
* 
* History     : 0.1 
*                                   
*
******************************************************************************/
T_RVM_RETURN etm_get_info(T_RVM_INFO_SWE *swe_info)
{
    /* SWE info */
    swe_info->swe_type = RVM_SWE_TYPE_4;
    swe_info->type_info.type4.swe_use_id = ETM_USE_ID;

    memcpy(swe_info->type_info.type4.swe_name, "ETM", sizeof("ETM"));
    swe_info->type_info.type4.stack_size = ETM_STACK_SIZE;
    swe_info->type_info.type4.priority   = RVM_ETM_TASK_PRIORITY;

    /* Set the return path */
    swe_info->type_info.type4.return_path.callback_func = NULL;
    swe_info->type_info.type4.return_path.addr_id       = 0;

    /* memory bank info */
    swe_info->type_info.type4.nb_mem_bank = 1;
    
    memcpy (swe_info->type_info.type4.mem_bank[0].bank_name, "ETM_PRIM", 9);
    swe_info->type_info.type4.mem_bank[0].initial_params.size          = ETM_MB_PRIM_SIZE;
    swe_info->type_info.type4.mem_bank[0].initial_params.watermark     = ETM_MB_PRIM_WATERMARK;

    /* linked SWE info */
    /* this SWE requires the ATP SWE to run */
#ifdef RVM_ATP_SWE
    swe_info->type_info.type4.nb_linked_swe = 1;
    swe_info->type_info.type4.linked_swe_id[0] = ATP_USE_ID;
#else
     swe_info->type_info.type4.nb_linked_swe = 0;
#endif

    /* generic functions */
    swe_info->type_info.type4.set_info = etm_set_info;
    swe_info->type_info.type4.init     = etm_init;
    swe_info->type_info.type4.core     = etm_start;
    swe_info->type_info.type4.stop     = etm_stop;
    swe_info->type_info.type4.kill     = etm_kill;

    return RVM_OK;
}


/******************************************************************************
* Function    : etm_set_info
*
* Description : This function is called by the RV manager to inform  
*               the driver SWE about task_id, mb_id and error function.
*
* Parameters  : - T_RVF_ADDR_ID  addr_id: unique path to the SWE.
*                    - T_RV_RETURN ReturnPath[], array of return path for linked SWE
*                    - T_RVF_MB_ID mbId[]: array of memory bank ids.
*                    - callback function to call in case of unrecoverable error.
*
* Return      : T_RVM_RETURN
* 
* History     : 0.1
*                                   
*
******************************************************************************/

T_RVM_RETURN etm_set_info (T_RVF_ADDR_ID    addr_id, 
                           T_RV_RETURN      return_path[], 
                           T_RVF_MB_ID      bk_id[],
                           T_RVM_RETURN (*rvm_error_ft)(T_RVM_NAME          swe_name, 
                                                        T_RVM_RETURN        error_cause, 
                                                        T_RVM_ERROR_TYPE    error_type, 
                                                        T_RVM_STRING        error_msg))
{
    /* Create instance gathering all the variable used by EXPL instance */
    if (rvf_get_buf(bk_id[0], 
                    sizeof(T_ETM_ENV_CTRL_BLK),
                    (T_RVF_BUFFER**)&etm_env_ctrl_blk) != RVF_GREEN)
    {
        /* The environemnt will cancel the ETM instance creation. */
        return RVM_MEMORY_ERR;
    }


    /* Store the pointer to the error function */
    etm_env_ctrl_blk->error_ft = rvm_error_ft ;
    /* Store the mem bank id. */
    etm_env_ctrl_blk->prim_id = bk_id[0];
   /* Store the addr id */
    etm_env_ctrl_blk->addr_id = addr_id;

    /*
     * Task ID (task_id) and Memory bank ID (mb_id) can be retrieved later 
     * using rvf_get_taskid and rvf_get_mb_id functions.
     */

    /* return_path of linked SWE -> not used */

    return RVM_OK;
}


/******************************************************************************
* Function    : etm_init
*
* Description : This function is called by the RV manager to initialize the 
*               etm SWE before creating the task and calling etm_start. 
*
* Parameters  : None
*
* Return      : T_RVM_RETURN
* 
* History     : 0.1 (20-August-2000)
*                                   
*
******************************************************************************/

T_RVM_RETURN etm_init(void)
{
    etm_is_running = 1;		/* FreeCalypso addition */
    return RVM_OK;
}


/******************************************************************************
* Function    : etm_start
*
* Description : This function is called by the RV manager to start the etm
*               SWE, it is the body of the task.
*
* Parameters  : None
*
* Return      : T_RVM_RETURN
* 
* History     : 0.1 
*                                   
*
******************************************************************************/

T_RVM_RETURN etm_start(void)
{
    etm_task();
    return RV_OK;
}


/******************************************************************************
* Function    : etm_stop
*
* Description : This function is called by the RV manager to stop the etm SWE.
*
* Parameters  : None
*
* Return      : T_RVM_RETURN
* 
* History     : 0.1                                 
*
******************************************************************************/

T_RVM_RETURN etm_stop(void)
{
    etm_is_running = 0;		/* FreeCalypso addition */
    return RVM_OK;
}

/******************************************************************************
* Function    : etm_kill
*
* Description : This function is called by the RV manager to kill the etm 
*               SWE, after the etm_stop function has been called.
*
* Parameters  : None
*
* Return      : T_RVM_RETURN
* 
* History     : 0.1 
*                                   
*
******************************************************************************/

T_RVM_RETURN etm_kill (void)
{
    rvf_free_buf(etm_env_ctrl_blk);
    return RVM_OK;
}