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view src/g23m-aci/aci/gaci_srcc.h @ 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 fa8dc04885d8
children
line wrap: on
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/* 
+----------------------------------------------------------------------------- 
|  Project :  
|  Modul   :  
+----------------------------------------------------------------------------- 
|  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 :  source control management for GACI.
+----------------------------------------------------------------------------- 
*/ 

#ifndef GACI_SRCC_H
#define GACI_SRCC_H


typedef enum {
  SRRC_SNDCP_ENTITY = 0,
  SRRC_PPPS_ENTITY,
  SRRC_SIM_ENTITY,
#ifdef CO_UDP_IP
  SRRC_IP_ENTITY,
#endif
#ifdef FF_GPF_TCPIP
  SRRC_TCPIP_ENTITY,
#endif /* FF_GPF_TCPIP */
  SRRC_MAX_ENTITY

} SRCC_ENTITY_ID;


typedef enum {
  SRCC_INVALID_LINK = -1,
  SRCC_PPPS_SNDCP_LINK,
  //SRCC_NULL_SNDCP_LINK,
  SRCC_SIM_SNDCP_LINK,
#if defined (FF_PKTIO) OR defined (FF_TCP_IP) OR defined(FF_GPF_TCPIP) OR defined(FF_PSI)
  SRCC_PKTIO_SNDCP_LINK,
#endif /* FF_PKTIO OR FF_TCP_IP OR FF_GPF_TCPIP OR FF_PSI */
#if defined(FF_GPF_TCPIP)
  SRCC_TCPIP_SNDCP_LINK,
#endif /* FF_GPF_TCPIP */
  SRCC_IP_SNDCP_LINK,
  SRCC_MAX_LINK

} SRCC_LINK_NO;


/*********************************************************************/
/** START ** This will be defined in the SAP of the entity ** START **/

#ifndef MAX_SNDCP_INSTANCES
  #define MAX_SNDCP_INSTANCES  11
#endif

#ifndef MAX_PPPS_INSTANCES
  #define MAX_PPPS_INSTANCES  1
#endif

#ifndef MAX_SIM_INSTANCES
  #define MAX_SIM_INSTANCES  1
#endif

/************ WAP ************/
#ifdef CO_UDP_IP 
#ifndef MAX_IP_INSTANCES
  #define MAX_IP_INSTANCES  1
#endif
#endif
#ifdef FF_GPF_TCPIP
#ifndef MAX_TCPIP_INSTANCES
  #define MAX_TCPIP_INSTANCES 1
#endif
#endif
/************ WAP ************/
/*** END *** This will be defined in the SAP of the entity *** END ***/
/*********************************************************************/





/*
 *    function declarations
 */
EXTERN void   srcc_init             ( void );
EXTERN void   srcc_new_count        ( SRCC_LINK_NO link_no );
EXTERN void   srcc_delete_count     ( SRCC_LINK_NO link_no );
EXTERN BOOL   srcc_reserve_sources  ( SRCC_LINK_NO link_no, SHORT no );

#endif