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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
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/* 
+----------------------------------------------------------------------------- 
|  Project :  GSM-PS (6147)
|  Modul   :  PSA_L2R
+----------------------------------------------------------------------------- 
|  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 :  Definitions for the protocol stack adapter
|             Layer 2 Relay ( L2R )
+----------------------------------------------------------------------------- 
*/ 

#ifndef PSA_L2R_H
#define PSA_L2R_H

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

typedef enum
{
  L2R_DEACTIVATED = 0,
  L2R_ACTIVATE,
  L2R_CONNECT,
  L2R_CONNECTED,
  L2R_ENABLE,
  L2R_ENABLED,
//  L2R_DISABLE,
  L2R_DETACH,
  L2R_DISCONNECT,
  L2R_DEACTIVATE,
  L2R_ESCAPE
} T_L2R_STATE;


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

typedef struct
{
  UBYTE  rlp_vers;                /* L2R_XID_IND */
  USHORT k_ms_iwf;                /* L2R_ACTIVATE_REQ, L2R_XID_IND */
  USHORT k_iwf_ms;
  UBYTE  t1;
  UBYTE  t2;
  UBYTE  n2;
  UBYTE  pt;
  UBYTE  p0;
  USHORT p1;
  UBYTE  p2;
  UBYTE  uil2p;
  UBYTE  rate;
  USHORT err_cause;               /* L2R_ERROR_IND */ 
  ULONG  error_rate;              /* L2R_STATISTIC_IND */
  USHORT reset;                   /* L2R_RESET_IND */
} T_L2R_SET_PRM;

typedef struct L2RShrdParm
{
  UBYTE         owner;
  UBYTE         state;
  UBYTE         uart_conn;
  T_L2R_SET_PRM set_prm[OWN_SRC_MAX];
  T_L2R_SET_PRM set_prm_use;
} T_L2R_SHRD_PRM;

typedef struct L2RTstPrmRef
{
  const char * key;               /* keyword string */
  UBYTE  id;                      /* corresponding id */
} L2R_TSTPRM_REF;

/*==== PROTOTYPES =================================================*/

#ifdef DTI
GLOBAL SHORT psaL2R_Enable( T_DTI_CONN_LINK_ID  link_id, UBYTE peer );
#endif /* DTI */

GLOBAL SHORT psaL2R_Activate( UBYTE srcId );
GLOBAL SHORT psaL2R_Deactivate( void );
void  psaL2R_Init (void);

GLOBAL SHORT psaL2R_ESC( UBYTE src_id );

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

#ifdef PSA_L2RF_C

GLOBAL T_L2R_SHRD_PRM l2rShrdPrm;

#else

EXTERN T_L2R_SHRD_PRM l2rShrdPrm;

#endif /* PSA_L2RF_C */


#endif /* PSA_L2R_H */

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