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view src/cs/riviera/rvm/rvm_api.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 4e78acac3d88
children
line wrap: on
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/**
 *                                                                          
 *  @file	rvm_api.h                                              
 *                                                                          
 *  Public interface of the Riviera Manager.
 *
 * @author	Cristian Livadiotti (c-livadiotti@ti.com)
 * @version	0.2
 *
 */

/*
 * Revision History:																			
 *
 * 06/04/2000	Cristian Livadiotti		Create.
 * 10/18/2001	David Lamy-Charrier		Update for new Riviera 1.6.
 *																			
 * (C) Copyright 2001 by Texas Instruments Incorporated, All Rights Reserved
 */


#ifndef __RVM_API_H_
#define __RVM_API_H_

#include "rv/rv_general.h"
//#include "rvf_i.h"


#ifdef __cplusplus
extern "C" {
#endif

/******************************************************
* Message type used by rvf: add, del and  Modify timers
*******************************************************/
#define RVM_MSG_OFFSET_PUB		BUILD_MESSAGE_OFFSET(RVM_USE_ID)

#define RVM_TMS_MSG					(RVM_MSG_OFFSET_PUB | 0x004)
#define RVF_NOTIFY_MSG				(RVM_MSG_OFFSET_PUB | 0x006)

/******************************************************************/
/* RVM functions return type and values                           */
/******************************************************************/

/* Return type */
typedef T_RV_RET T_RVM_RETURN;


/* RVM return parameters definition */
#define	RVM_OK					RV_OK				
#define	RVM_NOT_SUPPORTED		RV_NOT_SUPPORTED		
#define	RVM_NOT_READY			RV_NOT_READY			
#define	RVM_MEMORY_ERR			RV_MEMORY_ERR			
#define	RVM_INTERNAL_ERR		RV_INTERNAL_ERR		
#define	RVM_INVALID_PARAMETER	RV_INVALID_PARAMETER	


/******************************************************************/
/* Definition / Types related to both API functions and messages */
/******************************************************************/

/* RVM USEID definition (Unique Software Entity IDentifier)*/
typedef UINT32 T_RVM_USE_ID;

#define RVM_INVALID_USE_ID		(0)

/* RVM name prototype */
#define RVM_NAME_MAX_LEN		(10)
typedef char T_RVM_NAME[RVM_NAME_MAX_LEN];

typedef UINT32 T_RVM_VERSION;


/***********************************************/
/* Definition / Types related to messages only */
/***********************************************/

/* Message used as a result from a rvm_start or rv_stop function call */
/*--------------------------------------------------------------------*/
#define	RVM_EVT_TO_APPLI (60009) // Value of the event field in the message buffer


/* Action field of the results message to application */
typedef enum {
    RVM_START_APPLI		= 0,
    RVM_STOP_APPLI		= 1
}T_RVM_APPLI_ACTION;


/* structure of RVM returned message to appli */
typedef struct
{
	T_RV_HDR			header;		// event field will be RVM_EVT_TO_APPLI
	T_RV_RETURN_PATH	rp;
	T_RVM_APPLI_ACTION	action;		// Indicates if the result is coming from a rvm_start or a rvm_stop function call
	T_RVM_NAME			swe_name;	// Name of the SW entity
	UINT8				swe_index;	// Number of the SW entity
	T_RVM_RETURN		result;
} T_RVM_APPLI_RESULT;




/***************************************/
/* RVM external functions declarations */
/***************************************/

/* enable init at boot up   */
BOOLEAN			rvm_init(void);
/* launch the creation process to start the specified SWE */
T_RVM_RETURN	rvm_start_swe( T_RVM_USE_ID swe_id, T_RV_RETURN_PATH return_path);

/* stop the specified SWE */
T_RVM_RETURN	rvm_stop_swe( T_RVM_USE_ID swe_id, T_RV_RETURN_PATH return_path);
T_RVM_RETURN	rvm_swe_stopped(T_RV_HDR* p_msg);

/* function called to start the RV Environment */
T_RVM_RETURN	rvm_start_environment();

/* function called to get the return_path of a SWE  */
T_RVM_RETURN	rvm_get_swe_information( T_RVM_USE_ID swe_id, 
										 T_RV_RETURN_PATH * return_path);

/* function called to get the user-friendly name of a SWE  */
T_RVM_RETURN	rvm_get_swe_name( T_RVM_USE_ID swe_id, 
								  T_RVM_NAME swe_name);

/* function called to get the version number of a SWE  */
T_RVM_RETURN	rvm_get_swe_version( T_RVM_USE_ID swe_id, 
									 T_RVM_VERSION * swe_version);

#ifdef __cplusplus
}
#endif


#endif /* __RVM_API_H_ */