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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 fa8dc04885d8
children
line wrap: on
line source

/* 
+----------------------------------------------------------------------------- 
|  Project :  GSM-PS (6147)
|  Modul   :  PSA_L2RP
+----------------------------------------------------------------------------- 
|  Copyright 2002 Texas Instruments Berlin, AG 
|                 All rights reserved. 
| 
|                 This file is confidential and a trade secret of Texas 
|                 Instruments Berlin, AG 
|                 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 Berlin, AG. 
+----------------------------------------------------------------------------- 
|  Purpose :  This module defines the processing functions for the
|             primitives send to the protocol stack adapter by layer
|             2 Relay.
+----------------------------------------------------------------------------- 
*/ 

#ifdef DTI

#ifndef PSA_L2RP_C
#define PSA_L2RP_C
#endif

#include "aci_all.h"

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

#include "dti.h"      /* functionality of the dti library */
#include "aci_cmh.h"
#include "ati_cmd.h"
#include "aci_cmd.h"
#include "aci_fd.h"
#include "aci.h"

#include "dti.h"
#include "dti_conn_mng.h"
#include "dti_cntrl_mng.h"

#include "psa.h"
#include "cmh.h"
#include "cmh_ra.h"
#include "psa_cc.h"
#include "psa_l2r.h"
#include "cmh_l2r.h"

#if defined (FF_WAP) || defined (FF_GPF_TCPIP) || defined (FF_SAT_E)
#include "wap_aci.h"
#include "psa_ppp_w.h"
#include "cmh_ppp.h"
#endif /* defined (FF_WAP) || defined (FF_GPF_TCPIP) */

#include "psa_uart.h"
#include "psa_ra.h"
#include "psa_uart.h"
#include "psa_util.h"

#include "sap_dti.h"

#include "dcm_f.h"

/*==== CONSTANTS ==================================================*/


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

/*==== EXPORT =====================================================*/

/*==== VARIABLES ==================================================*/

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

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_activate_cnf    |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_L2R_ACTIVATE_CNF primitive send by L2R.

*/

GLOBAL void psa_l2r_activate_cnf
                               (T_L2R_ACTIVATE_CNF *l2r_activate_cnf)
{
  TRACE_FUNCTION ("psa_l2r_activate_cnf()");

  if (!psaCC_ctbIsValid(raShrdPrm.cId))
  {
    TRACE_ERROR ("raShrdPrm.cId invalid");
    PFREE (l2r_activate_cnf);
    return;
  }

  switch (l2rShrdPrm.state)
  {
    case L2R_ACTIVATE:
    {
      if (l2r_activate_cnf->ack_flg EQ L2R_NAK)
      {
        l2rShrdPrm.state = L2R_DEACTIVATED;

        cmhL2R_Failure();
      }
      else
      {
        PALLOC (l2r_connect_req, L2R_CONNECT_REQ);

        l2rShrdPrm.state = L2R_CONNECT;

        PSENDX (L2R, l2r_connect_req);
      }

      break;
    }

    case L2R_DEACTIVATE:
    {
      break;
    }

    default:
    {
      l2rShrdPrm.state = L2R_DEACTIVATED;

      cmhL2R_Failure();

      break;
    }
  }

  PFREE (l2r_activate_cnf);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_connect_cnf     |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_CONNECT_CNF primitive send by L2R.

*/

GLOBAL  void psa_l2r_connect_cnf
                                (T_L2R_CONNECT_CNF *l2r_connect_cnf)
{
  TRACE_FUNCTION ("psa_l2r_connect_cnf()");

  if (!psaCC_ctbIsValid(raShrdPrm.cId))
  {
    TRACE_ERROR ("raShrdPrm.cId invalid");
    PFREE (l2r_connect_cnf);
    return;
  }

  switch (l2rShrdPrm.state)
  {
    case L2R_CONNECT:
    {
      if (l2r_connect_cnf->ack_flg EQ L2R_NAK)
      {
        PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

        l2rShrdPrm.state = L2R_DEACTIVATE;

        cmhL2R_Failure();

        PSENDX (L2R, l2r_deactivate_req);
      }
      else
      {
        l2rShrdPrm.state = L2R_CONNECTED;

        cmhCC_L2R_or_TRA_Activated( DTI_ENTITY_L2R, raShrdPrm.cId );
      }

      break;
    }

    case L2R_DEACTIVATE:
    {
      break;
    }

    default:
    {
      PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

      l2rShrdPrm.state = L2R_DEACTIVATE;

      cmhL2R_Failure();

      PSENDX (L2R, l2r_deactivate_req);

      break;
    }
  }

  PFREE (l2r_connect_cnf);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_connect_ind     |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_CONNECT_IND primitive send by L2R.

*/

GLOBAL  void psa_l2r_connect_ind
                                (T_L2R_CONNECT_IND *l2r_connect_ind)
{
  TRACE_FUNCTION ("psa_l2r_connect_ind()");

  if (!psaCC_ctbIsValid(raShrdPrm.cId))
  {
    TRACE_ERROR ("raShrdPrm.cId invalid");
    PFREE (l2r_connect_ind);
    return;
  }

  switch (l2rShrdPrm.state)
  {
    case L2R_CONNECT:
    {
      l2rShrdPrm.state = L2R_CONNECTED;

      cmhCC_L2R_or_TRA_Activated( DTI_ENTITY_L2R, raShrdPrm.cId );

      break;
    }

    case L2R_CONNECTED:
    case L2R_ENABLE:
    case L2R_ENABLED:
    /*    case L2R_DISABLE:*/
    {
      PALLOC (l2r_disc_req, L2R_DISC_REQ);

      l2rShrdPrm.state = L2R_DISCONNECT;

      cmhL2R_Failure();

      PSENDX (L2R, l2r_disc_req);

      break;
    }

    case L2R_ACTIVATE:
    {
      PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

      l2rShrdPrm.state = L2R_DEACTIVATE;

      cmhL2R_Failure();

      PSENDX (L2R, l2r_deactivate_req);

      break;
    }

    default:
    {
      cmhL2R_Failure();

      break;
    }
  }

  PFREE (l2r_connect_ind);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_deactivate_cnf  |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_DEACTIVATE_CNF primitive send by L2R.

*/

GLOBAL  void psa_l2r_deactivate_cnf
                          (T_L2R_DEACTIVATE_CNF *l2r_deactivate_cnf)
{
  TRACE_FUNCTION ("psa_l2r_deactivate_cnf()");

  switch (l2rShrdPrm.state)
  {
    default:
    {
      cmhL2R_Failure();
    }
    /*lint -fallthrough */
    case L2R_DEACTIVATE:
    {
      l2rShrdPrm.state = L2R_DEACTIVATED;

      cmhL2R_Deactivated();

      break;
    }

  }

  PFREE (l2r_deactivate_cnf);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_disc_cnf        |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_DISC_CNF primitive send by L2R.

*/

GLOBAL  void psa_l2r_disc_cnf (T_L2R_DISC_CNF *l2r_disc_cnf)
{
  TRACE_FUNCTION ("psa_l2r_disc_cnf()");

  switch (l2rShrdPrm.state)
  {
    default:
    {
      cmhL2R_Failure();
    }
    /*lint -fallthrough */
    case L2R_DISCONNECT:
    {
      PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

      l2rShrdPrm.state = L2R_DEACTIVATE;

      PSENDX (L2R, l2r_deactivate_req);

      break;
    }

  }

  PFREE (l2r_disc_cnf);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_disc_ind        |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_DISC_IND primitive send by L2R.

*/

GLOBAL  void psa_l2r_disc_ind (T_L2R_DISC_IND *l2r_disc_ind)
{
  TRACE_FUNCTION ("psa_l2r_disc_ind()");

#if defined (FF_WAP) || defined (FF_SAT_E)
  if (Wap_Call)
  {

    /*
     *  Start terminate the whole PPP Stack if PPP activ
     */
    if((pppShrdPrm.state EQ PPP_ESTABLISHED) OR (pppShrdPrm.state EQ PPP_ESTABLISH))
      cmhPPP_Terminate( DWN );
  }
  else
#endif /* of WAP or SAT E */
  {
    switch (l2rShrdPrm.state)
    {
      default:
      {
        cmhL2R_Failure();
      }
      /*lint -fallthrough  */
      case L2R_ENABLED:
      {
        T_DTI_CONN_LINK_ID link_id = dti_cntrl_get_link_id( DTI_ENTITY_L2R, DTI_INSTANCE_NOTPRESENT, DTI_SUB_NO_NOTPRESENT );
        dti_cntrl_set_dti_id_to_reconnect(EXTRACT_DTI_ID(link_id));
        dti_cntrl_entity_disconnected( link_id, DTI_ENTITY_L2R );
      }
          /* NO BREAK ! */
      /*lint -fallthrough */
      case L2R_CONNECTED:
      /*      case L2R_DISABLE:*/
      {
        PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

        l2rShrdPrm.state = L2R_DEACTIVATE;

        PSENDX (L2R, l2r_deactivate_req);

        break;
      }
    }
  }

  PFREE (l2r_disc_ind);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_error_ind       |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_ERROR_IND primitive send by L2R.

*/

GLOBAL  void psa_l2r_error_ind (T_L2R_ERROR_IND *l2r_error_ind)
{
  T_DTI_CONN_LINK_ID link_id;

  TRACE_FUNCTION ("psa_l2r_error_ind()");

#if defined (FF_WAP) || defined (FF_SAT_E)

  if (Wap_Call)
  {

    /*
     *  Start terminate the whole PPP Stack if PPP have established call
     *  or by establish call.
     */

    if((pppShrdPrm.state EQ PPP_ESTABLISHED) OR (pppShrdPrm.state EQ PPP_ESTABLISH))
      cmhPPP_Terminate( DWN );

    PFREE (l2r_error_ind);
    return;
  }

#endif /* of WAP or SAT E */


  link_id = dti_cntrl_get_link_id( DTI_ENTITY_L2R, DTI_INSTANCE_NOTPRESENT, DTI_SUB_NO_NOTPRESENT );

  if (dti_cntrl_is_dti_channel_connected (DTI_ENTITY_L2R, EXTRACT_DTI_ID(link_id)) EQ TRUE)
  {
    dti_cntrl_entity_disconnected( link_id, DTI_ENTITY_L2R );
  }
  {
    PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

    l2rShrdPrm.set_prm[l2rShrdPrm.owner].err_cause = l2r_error_ind->cause;

    l2rShrdPrm.state = L2R_DEACTIVATE;

    cmhL2R_Failure();

    PSENDX (L2R, l2r_deactivate_req);
  }

  PFREE (l2r_error_ind);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_reset_ind       |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_RESET_IND primitive send by L2R.

*/

GLOBAL  void psa_l2r_reset_ind (T_L2R_RESET_IND *l2r_reset_ind)
{
  TRACE_FUNCTION ("psa_l2r_reset_ind()");

  switch (l2rShrdPrm.state)
  {
    case L2R_CONNECTED:
    case L2R_ENABLE:
    case L2R_ENABLED:
    /*    case L2R_DISABLE:*/
    case L2R_ACTIVATE:
    case L2R_CONNECT:
    {
      l2rShrdPrm.set_prm[l2rShrdPrm.owner].reset++;

      break;
    }
    /*
    case L2R_ACTIVATE:
    case L2R_CONNECT:
    {
      PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

      l2rShrdPrm.state = L2R_DEACTIVATE;

      cmhL2R_Failure();

      PSENDX (L2R, l2r_deactivate_req);

      break;
    }
    */
    default:
    {
      cmhL2R_Failure();

      break;
    }
  }

  PFREE (l2r_reset_ind);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_statistic_ind   |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_STATISTIC_IND primitive send by L2R.

*/

GLOBAL  void psa_l2r_statistic_ind
                             (T_L2R_STATISTIC_IND *l2r_statistic_ind)
{
  TRACE_FUNCTION ("psa_l2r_statistic_ind()");

  l2rShrdPrm.set_prm_use.error_rate = l2r_statistic_ind->error_rate;

  PFREE (l2r_statistic_ind);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_dti_cnf         |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_DTI_CNF primitive send by L2R.

*/

GLOBAL  void psa_l2r_dti_cnf (T_L2R_DTI_CNF *l2r_dti_cnf)
{
  TRACE_FUNCTION ("psa_l2r_dti_cnf()");

  /* store the current DTI id for the case of redirection */
  raShrdPrm.dti_id = EXTRACT_DTI_ID(l2r_dti_cnf->link_id);        

  switch (l2rShrdPrm.state)
  {
    case L2R_ESCAPE:
    {
      if (l2r_dti_cnf->dti_conn NEQ l2rShrdPrm.uart_conn)
      {
        cmhL2R_Failure();
      }
      l2rEntStat.isTempDisconnected = TRUE;
      dti_cntrl_entity_disconnected( l2r_dti_cnf->link_id, DTI_ENTITY_L2R );

      l2rShrdPrm.state = L2R_CONNECTED;
      break;
    }

    case L2R_ENABLE:
    {
      if (l2r_dti_cnf->dti_conn NEQ l2rShrdPrm.uart_conn)
      {
        PALLOC (l2r_disc_req, L2R_DISC_REQ);

        l2rShrdPrm.state = L2R_DISCONNECT;

        cmhL2R_Failure();

        PSENDX (L2R, l2r_disc_req);
      }
      else
      {
#if defined(FF_WAP) OR defined(FF_GPF_TCPIP) OR defined (FF_SAT_E)
        T_ACI_WAP_STATES act_state = Wap_Not_Init;
        if(is_gpf_tcpip_call()) {
          GPF_TCPIP_STATEMENT(act_state = TCPIP_Activation);
        }
        else {
          act_state = IPA_Activated;
        }
#endif
        l2rShrdPrm.state = L2R_ENABLED;

#if defined(FF_WAP) OR defined(FF_GPF_TCPIP) OR defined (FF_SAT_E) OR defined (FF_PPP)
        if ((Wap_Call AND (wap_state EQ act_state)) OR pppShrdPrm.is_PPP_CALL)
        {
          dti_cntrl_entity_connected( l2r_dti_cnf->link_id, DTI_ENTITY_L2R, DTI_OK );
        }
#ifdef FF_SAT_E        
        else if (psa_search_SATSrcId() >= 0)/* sat class c  connection SIM-L2R */
        {
          dti_cntrl_entity_connected( l2r_dti_cnf->link_id, DTI_ENTITY_L2R, DTI_OK );
        }
#endif  /* FF_SAT_E */
        else
        {
          TRACE_EVENT(" error: wrong WAP state ");
        }
#else   /* WAP OR FF_GPF_TCPIP or SAT E */
      dti_cntrl_entity_connected( l2r_dti_cnf->link_id, DTI_ENTITY_L2R, DTI_OK );
#endif  /* of WAP OR FF_GPF_TCPIP or SAT E */
      }

      break;
    }

/*    case L2R_DISABLE:
    {
      if (l2r_dti_cnf->dti_conn NEQ l2rShrdPrm.uart_conn)
      {
        PALLOC (l2r_disc_req, L2R_DISC_REQ);

        l2rShrdPrm.state = L2R_DISCONNECT;

        cmhL2R_Failure();

        PSENDX (L2R, l2r_disc_req);
      }
      else
      {
        l2rShrdPrm.state = L2R_CONNECTED;

        cmhL2R_TRA_Disabled();
      }

      break;
    }*/

    case L2R_DETACH:
    {
      if (l2r_dti_cnf->dti_conn NEQ l2rShrdPrm.uart_conn)
      {
        cmhL2R_Failure();
      }

      {
        PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);
        l2rShrdPrm.state = L2R_DEACTIVATE;
        /* Set the flag to reconnect the registered device to ACI */
        dti_cntrl_set_dti_id_to_reconnect(EXTRACT_DTI_ID(l2r_dti_cnf->link_id));
        dti_cntrl_entity_disconnected( l2r_dti_cnf->link_id, DTI_ENTITY_L2R );
        PSENDX (L2R, l2r_deactivate_req);
      }

      break;
    }

    case L2R_DISCONNECT:
    case L2R_DEACTIVATE:
    {
      break;
    }

    default:
    {
      PALLOC (l2r_disc_req, L2R_DISC_REQ);

      l2rShrdPrm.state = L2R_DISCONNECT;

      cmhL2R_Failure();

      PSENDX (L2R, l2r_disc_req);

      break;
    }
  }

  PFREE (l2r_dti_cnf);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_dti_ind        |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_DTI_IND primitive send by L2R.

*/

GLOBAL  void psa_l2r_dti_ind (T_L2R_DTI_IND *l2r_dti_ind)
{
  TRACE_FUNCTION ("psa_l2r_dti_ind()");

  /* store the current DTI id for the case of redirection */
  raShrdPrm.dti_id = EXTRACT_DTI_ID(l2r_dti_ind->link_id);        

  switch (l2rShrdPrm.state)
  {
    case L2R_ENABLED:
    {
      l2rEntStat.isTempDisconnected = TRUE;
      /* Set the flag to reconnect the registered device to ACI */
      dti_cntrl_set_dti_id_to_reconnect(EXTRACT_DTI_ID(l2r_dti_ind->link_id));
      dti_cntrl_entity_disconnected( l2r_dti_ind->link_id, DTI_ENTITY_L2R );

      l2rShrdPrm.state = L2R_CONNECTED;

      break;
    }

    case L2R_CONNECTED:
    case L2R_ENABLE:
    {
      PALLOC (l2r_disc_req, L2R_DISC_REQ);

      l2rShrdPrm.state = L2R_DISCONNECT;

      cmhL2R_Failure();

      PSENDX (L2R, l2r_disc_req);

      break;
    }

    case L2R_ACTIVATE:
    case L2R_CONNECT:
    {
      PALLOC (l2r_deactivate_req, L2R_DEACTIVATE_REQ);

      l2rShrdPrm.state = L2R_DEACTIVATE;

      cmhL2R_Failure();

      PSENDX (L2R, l2r_deactivate_req);

      break;
    }

    default:
    {
      cmhL2R_Failure();

      break;
    }
  }

  PFREE (l2r_dti_ind);
}

/*
+-------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)         MODULE  : PSA_L2R                 |
|                                 ROUTINE : psa_l2r_xid_ind         |
+-------------------------------------------------------------------+

  PURPOSE : processes the L2R_XID_IND primitive send by L2R.

*/

GLOBAL  void psa_l2r_xid_ind (T_L2R_XID_IND *l2r_xid_ind)
{
#define X l2rShrdPrm.set_prm_use

  TRACE_FUNCTION ("psa_l2r_xid_ind()");

  X.rlp_vers = l2r_xid_ind->rlp_vers;
  X.k_ms_iwf = l2r_xid_ind->k_ms_iwf;
  X.k_iwf_ms = l2r_xid_ind->k_iwf_ms;
  X.t1       = l2r_xid_ind->t1;
  X.t2       = l2r_xid_ind->t2;
  X.n2       = l2r_xid_ind->n2;
  X.pt       = l2r_xid_ind->pt;
  X.p0       = l2r_xid_ind->p0;
  X.p1       = l2r_xid_ind->p1;
  X.p2       = l2r_xid_ind->p2;

  PFREE (l2r_xid_ind);

#undef X
}
#endif /* DTI */

/*==== EOF =========================================================*/