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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-F&D (8411)
|  Modul   :  ACI
+-----------------------------------------------------------------------------
|  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.
+-----------------------------------------------------------------------------
|  Description :  DCM instance is a state machine with several possible states.
|                 Based on the current state, DCM handle different kind of messages/events.
|                 States are listed in the order they should normally be sequenced.
+-----------------------------------------------------------------------------
*/

#ifndef __DCMSTATE_H__
#define __DCMSTATE_H__

/**
 * DCM states.
 *
 * DCM instance is a state machine with several possible states.
 * Based on the current state, DCM handle different kind of messages/events.
 * States are listed in the order they should normally be sequenced.
 *
 * See the Readme file for a description of the state machine.
 */
typedef enum
{
	DCM_OFF,
	DCM_IDLE,
	DCM_ACTIVATING_CONN,
	DCM_CONN_ACTIVATED,
	DCM_CLOSING_CONN
} T_DCM_INTERNAL_STATE;


/**
 * DCM substates.
 *
 * DCM instance is a state machine with several possible states.
 * Substates are included in some states.
 */

typedef enum
{
  DCM_SUB_NO_ACTION = 0,                            /* ALL */
  DCM_SUB_WAIT_CGATT_CNF,                           /* DCM_ACTIVATING_CONN */
  DCM_SUB_WAIT_CGACT_CNF,                           /* DCM_ACTIVATING_CONN */
  DCM_SUB_WAIT_SATDN_CNF,                           /* DCM_ACTIVATING_CONN */
  DCM_SUB_WAIT_SATH_CNF,                            /* DCM_CLOSING_CONN    */
  DCM_SUB_WAIT_CGDEATT_CNF,                         /* DCM_CLOSING_CONN    */
  DCM_SUB_WAIT_CGDEACT_CNF                          /* DCM_CLOSING_CONN    */
} T_DCM_INTERNAL_SUBSTATE;


T_DCM_RET dcm_idle (T_DCM_HDR * msg_p);
T_DCM_RET dcm_activating_conn(T_DCM_HDR * msg_p);
T_DCM_RET dcm_conn_activated(T_DCM_HDR * msg_p);
T_DCM_RET dcm_closing_conn(T_DCM_HDR * msg_p );

T_DCM_RET dcm_new_state(U8 state, U8 substate);
T_DCM_RET dcm_save_state(void);
T_DCM_RET dcm_restore_state(void);
void dcm_dispay_state(U8 state, U8 substate);
void dcm_dispay_sub_state(U8 substate_1, U8 substate_2);


#endif