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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
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/**
 * @file   lls_env.h
 *
 * Declarations of the Riviera Generic Functions 
 *
 * @author   Laurent Sollier (l-sollier@ti.com)
 * @version 0.1
 */

/*
 * History:
 *
 *   Date          Author       Modification
 *  ----------------------------------------
 *  03/12/2002     L Sollier    Create
 *
 *
 * (C) Copyright 2002 by Texas Instruments Incorporated, All Rights Reserved
 */

#ifndef _LLS_ENV_H_
#define _LLS_ENV_H_

#include "rvm/rvm_gen.h"

#include "lls/lls_pool_size.h"	/* Stack & Memory Bank sizes definitions */

/**
 * @name Mem bank
 *
 * Memory bank size and watermark.
 */
/*@{*/
#define LLS_MB_PRIM_SIZE      LLS_MB1_SIZE
#define LLS_MB_PRIM_WATERMARK LLS_MB_PRIM_SIZE
/*@}*/


/** Define a structure used to store all the informations related to LLS's task
 *   & MBs identifiers.
 */
typedef struct
{
   T_RVF_MB_ID    prim_id;
   BOOL           swe_is_initialized;
   T_RVM_RETURN   (*error_ft)(T_RVM_NAME        swe_name,
                              T_RVM_RETURN      error_cause,
                              T_RVM_ERROR_TYPE  error_type,
                              T_RVM_STRING      error_msg);
} T_LLS_ENV_CTRL_BLK;




/**
 * @name Generic functions
 *
 * Generic functions declarations.
 */
/*@{*/


T_RVM_RETURN lls_get_info(T_RVM_INFO_SWE  *infoSWE);

T_RVM_RETURN lls_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));

T_RVM_RETURN lls_init(void);

T_RVM_RETURN lls_start(void);

T_RVM_RETURN lls_stop(void);

T_RVM_RETURN lls_kill(void);

/*@}*/


#endif /* #ifndef _LLS_ENV_H_ */