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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
line source

/************* Revision Controle System Header *************
 *                  GSM Layer 1 software
 * L1_DYN_DWL_DEFTY.H
 *
 *        Filename l1_dyn_dwl_defty.h
 *  Copyright 2004 (C) Texas Instruments
 *
 ************* Revision Controle System Header *************/
#if(L1_DYN_DSP_DWNLD==1)

#ifndef _L1_DYN_DWL_DEFTY_H_
#define _L1_DYN_DWL_DEFTY_H_

#include "l1_dyn_dwl_const.h"

/***************************************************************************************/
/* Dynamic download L1A structure to store dynamic download L1A global variables       */
/***************************************************************************************/
typedef struct
{
  UWORD32 signal_code_vect[MAX_NUM_OF_PATCH_IDS];
  UWORD32 num_of_elem;
}T_FIFO_DYN_DWNLD ;
typedef struct
{
 UWORD8  state;
 UWORD16 num_patches_installed;
 UWORD16 patch_id[MAX_NUM_OF_PATCH_IDS];
 UWORD16 num_of_elem_to_copy;
 UWORD16 next_patch_id[MAX_NUM_OF_PATCH_IDS];
 BOOL    semaphore_vect[MAX_NUM_OF_SEMAPHORES];
 BOOL    melody0_E2_flag_activated;
 BOOL    melody1_E2_flag_activated; 
 UWORD16 dsp_trace_level_copy;
 BOOL    trace_flag_blocked;
 UWORD16 num_of_primitives;
 BOOL    dedicated_stop_flag;
 T_FIFO_DYN_DWNLD waiting_patch_fifo;
}T_L1A_DYN_DWNLD_GLOBAL;

/***************************************************************************************/
/* Dynamic DSP L1A-L1S structure...                                                    */
/***************************************************************************************/
typedef struct
{
  BOOL start;
  BOOL stop;
} T_DYN_DWNLD_TASK_COMMAND;

/***************************************************************************************/
/* Dynamic DSP download HISR - L1A structure...                                        */
/***************************************************************************************/
typedef struct
{
  BOOL  restart;
} T_DYN_DWNLD_HISR_COMMAND;

typedef struct
{
  UWORD16 num_of_elem;
  UWORD32 address[MAX_NUM_OF_PATCH_IDS];
} T_DYN_DWNLD_HISR_UN_PARAM;

typedef struct
{
  UWORD32 start_MCU_copy_address[MAX_NUM_OF_PATCH_IDS];
  UWORD16 size_of_dwnld_area;
  UWORD16 start_of_dwnld_area; 
  UWORD16 num_of_elem;
  UWORD32 address_to_install[MAX_NUM_OF_PATCH_IDS];
  UWORD16 crc[MAX_NUM_OF_PATCH_IDS];
  UWORD16 size_array[MAX_NUM_OF_PATCH_IDS];
}T_DYN_DWNLD_HISR_CPY_PARAM;

typedef struct
{
  T_DYN_DWNLD_HISR_COMMAND command;
  T_DYN_DWNLD_HISR_UN_PARAM uninstall_parameters;
  T_DYN_DWNLD_HISR_CPY_PARAM copy_parameters;
} T_L1A_DYN_DWNLD_HISR_COM;

/***************************************************************************************/
/* Dynamic download HISR structure to store dynamic download HISR global variables     */
/***************************************************************************************/

typedef struct
{
  UWORD8 state;
  BOOL   running;
  UWORD16 uninstall_counter;
  UWORD16 patch_ids_counter;
  UWORD32 running_source_pointer;
  UWORD16 tmp_patch_size;
} T_L1_DYN_DWNLD_API_HISR;

/***************************************************************************************/
/* Dynamic Download MCU-DSP API                                                        */
/***************************************************************************************/
typedef struct
{
  API d_api_dwl_download_ctrl;
  API d_api_dwl_error_code;
  API d_api_dwl_function_address[2];
  API d_api_dwl_crc;
  API d_api_dwl_size;
  API d_api_dwl_write_pointer;
} T_DYN_DWNLD_MCU_DSP;

typedef struct
{
  UWORD32 primitive;
  UWORD16 msg_id;
}T_SIGNAL_PATCH;

#define   GPRS_PATCH 0
#define   AMR_SCH_PATCH 1
#define   TTY_PATCH 2
#define   AMR_MMS_PATCH 3
#define   E2_PATCH 4


#define   DEDI_STATE_MACHINE 0
#define   TTY_STATE_MACHINE 1
#define   E2_STATE_MACHINE 2
#define   VOICE_MEMO_AMR_SM 3
#define   VOICE_PLAY_AMR_SM 4
#define   SPEECH_RECO_SM 5

#endif  // _L1_DYN_DWL_DEFTY_H_
#endif  // L1_DYN_DSP_DWNLD