view src/g23m-gprs/upm/upm_dispatcher_gsm.c @ 220:0ed36de51973

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 fa8dc04885d8
children
line wrap: on
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/*----------------------------------------------------------------------------
|  Project :  3G PS
|  Module  :  UPM
+-----------------------------------------------------------------------------
|             Copyright 2003 Texas Instruments.
|             All rights reserved. 
| 
|             This file is confidential and a trade secret of Texas 
|             Instruments .
|             The receipt of or possession of this file does not convey 
|             any rights to reproduce or disclose its contents or to 
|             manufacture, use, or sell anything it may describe, in 
|             whole, or in part, without the specific written consent of 
|             Texas Instruments. 
+-----------------------------------------------------------------------------
| Purpose:    This module implements the process dispatcher for GSM primitives
|             in the User Plane Manager (UPM) entity.
|             For design details, see:
|             8010.939 UPM Detailed Specification
+---------------------------------------------------------------------------*/

/*==== DECLARATION CONTROL =================================================*/


/*==== INCLUDES =============================================================*/

#include "upm.h"

#ifndef UPM_WITHOUT_USER_PLANE
#include "upm_dti_output_handler.h"
#endif

/*==== CONSTS ===============================================================*/

/*==== TYPES ================================================================*/

/*==== LOCALS ===============================================================*/

/*==== PRIVATE FUNCTIONS ====================================================*/

/*==== PUBLIC FUNCTIONS =====================================================*/

/*
+------------------------------------------------------------------------------
| Function    : upm_disp_mmpm_sequence_ind
+------------------------------------------------------------------------------
| Description : Dispatch MMPM_SEQUENCE_IND
|
| Parameters  : prim                         - received primitive
+------------------------------------------------------------------------------
*/
void upm_disp_mmpm_sequence_ind (T_MMPM_SEQUENCE_IND *prim)
{
  (void)TRACE_FUNCTION("upm_disp_mmpm_sequence_ind");

  upm_sndcp_dispatch_mmpm_sequence_ind(prim);
}

/*
+------------------------------------------------------------------------------
| Function    : upm_disp_sn_activate_cnf
+------------------------------------------------------------------------------
| Description : Dispatch SN_ACTIVATE_CNF
|
| Parameters  : prim                       - received primitive
+------------------------------------------------------------------------------
*/
void upm_disp_sn_activate_cnf (T_SN_ACTIVATE_CNF *prim)
{
  struct T_CONTEXT_DATA *context;

  (void)TRACE_FUNCTION("upm_disp_sn_activate_cnf");

  /* Find context data using NSAPI as index */
  context = upm_get_context_data_from_nsapi(prim->nsapi);

  if (context != NULL) {
    /* Forward primitive to SNDCP Control */
    upm_sndcp_control(context, UPM_P_SN_ACTIVATE_CNF, prim);
  } else {
    (void)TRACE_ERROR("Received SN_ACTIVATE_CNF for non-existing context "
                      "- discarded!");
  }
}

/*
+------------------------------------------------------------------------------
| Function    : upm_disp_sn_count_cnf
+------------------------------------------------------------------------------
| Description : Dispatch SN_COUNT_CNF
|
| Parameters  : prim                       - received primitive
+------------------------------------------------------------------------------
*/
void upm_disp_sn_count_cnf (T_SN_COUNT_CNF *prim)
{
  struct T_CONTEXT_DATA *ptr_context_data;

  (void)TRACE_FUNCTION("upm_disp_sn_count_cnf");

  ptr_context_data = upm_get_context_data_from_nsapi(prim->nsapi);
  if (ptr_context_data != NULL) {
    /* Forward primitive to SNDCP Control */
    upm_sndcp_dispatch_sn_count_cnf(prim);
  } else {
    (void)TRACE_ERROR("Received SN_COUNT_CNF for non-existing context "
                      "- discarded!");
  }
}

/*
+------------------------------------------------------------------------------
| Function    : upm_disp_sn_deactivate_cnf
+------------------------------------------------------------------------------
| Description : Dispatch SN_DEACTIVATE_CNF
|
| Parameters  : prim                       - received primitive
+------------------------------------------------------------------------------
*/
void upm_disp_sn_deactivate_cnf (T_SN_DEACTIVATE_CNF *prim)
{
  struct T_CONTEXT_DATA *ptr_context_data;

  (void)TRACE_FUNCTION("upm_disp_sn_deactivate_cnf");

  ptr_context_data = upm_get_context_data_from_nsapi(prim->nsapi);
  if (ptr_context_data != NULL) {
    /* Forward primitive to SNDCP Control */
    upm_sndcp_control(ptr_context_data, UPM_P_SN_DEACTIVATE_CNF, NULL);

    upm_check_for_released_context_and_release(ptr_context_data);
  }
}

/*
+------------------------------------------------------------------------------
| Function    : upm_disp_sn_modify_cnf
+------------------------------------------------------------------------------
| Description : Dispatch SN_MODIFY_CNF
|
| Parameters  : prim                      - received primitive
+------------------------------------------------------------------------------
*/
void upm_disp_sn_modify_cnf (T_SN_MODIFY_CNF *prim)
{
  struct T_CONTEXT_DATA *context;

  (void)TRACE_FUNCTION("upm_disp_sn_modify_cnf");

  /* Find context data using NSAPI as index */
  context = upm_get_context_data_from_nsapi(prim->nsapi);

  if (context != NULL) {
    /* Forward primitive to SNDCP Control */
    upm_sndcp_control(context, UPM_P_SN_MODIFY_CNF, prim);
  } else {
    (void)TRACE_ERROR("Received SN_MODIFY_CNF for non-existing context "
                      "- discarded!");
  }
}

/*==== END OF FILE ==========================================================*/