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view src/g23m-aci/aci/db_int.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 fa8dc04885d8
children
line wrap: on
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/* 
+----------------------------------------------------------------------------- 
|  Project :  PHB
|  Modul   :  DBM
+----------------------------------------------------------------------------- 
|  Copyright 2005 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 :  Internal declarations for DBM module
+----------------------------------------------------------------------------- 
*/ 
#ifndef DB_INT_H
#define DB_INT_H

#include "db.h"

/* This macro allows us to close the file before
   returning from function */
#define FFS_OPEN_PROBLEM_PATCH

/* If this macro is activated, we close earlier activated file
   before opening next file */
#define FFS_CLOSE_BEFORE_OPEN

/* Mutually exclusive macros */
#ifdef FFS_CLOSE_BEFORE_OPEN
#undef FFS_OPEN_PROBLEM_PATCH
#endif

#ifdef FFS_CLOSE_BEFORE_OPEN

  #define MAX_OPEN_READ_PER_DB 2
  #define MAX_OPEN_WRITE_PER_DB 1

#endif

#ifdef _SIMULATION_
  #include "ffs_pc_api.h"
#else
  #include "ffs/ffs.h"
#endif

#include "vsi.h"
#include "aci_mem.h"

#define RECORD_BITMAP_SIZE      32  /* Based on MAX_NUM_RECORDS 
                                        RECORD_BITMAP_SIZE = MAX_NUM_RECORDS/8*/
#define MAX_LEN_DIRECTORY       16  /* Assumed to be max 16 characters        */


/* 
    DBM state 
 */
typedef enum
{
  
  DBM_NOT_INITIALISED = 0, 
  DBM_INITIALISED 

} T_DBM_STATE;

/* 
    Database state 
*/
typedef enum
{ 

  CLOSED = 0, 
  OPEN,
  IN_USE,
  UNUSED_ENTRY = 0xFF

} T_DB_STATE;

#ifdef FFS_CLOSE_BEFORE_OPEN

typedef struct
{

  UBYTE    fld_ctr;
  T_FFS_FD filehandle;

} FileHandleRecord;

#endif

/* 
    Field record
 */
typedef struct
{

  USHORT    FieldID;                                /* Elementary file identifier                           */
  T_DB_TYPE DBType;                                 /* database type (UNMANAGED, FREELIST)                  */
  USHORT    RecordSize;                             /* Size of data in data base record                     */
  UBYTE     NumOfRecords;                           /* Number of records                                    */
  UBYTE     UsedRecords;                            /* Number of used records                               */
  UBYTE     RecordBitMap [RECORD_BITMAP_SIZE];      /* Bitmap representing whether record is present or not */
  BOOL      Clean;                                  /* File consistency                                     */
  UBYTE     SortIndexList [MAX_NUM_OF_SORT_INDEXS]; /* Number of associated index files                     */
  UBYTE*    SortedLists [MAX_NUM_OF_SORT_INDEXS];   /* Sorted lists                                         */

#ifndef FFS_CLOSE_BEFORE_OPEN
  T_FFS_FD  FFSFileHandle;                          /* FFS File Handle for User file                        */
#endif

  UBYTE     NextRecordNum;                          /* To take care of non-seqential write                  */

} T_DBM_FIELDRECORD;


typedef struct 
{

  UBYTE               DBDirectory[MAX_LEN_DIRECTORY]; /* Directory path                                       */
  UBYTE               NumOfFiles;                     /* Maximum files in that database                       */
  UBYTE               UsedFiles;                      /* Number of used files                                 */
  BOOL                Clean;                          /* Clean: Database is consistent                        */
  BOOL                Tracked;                        /* Tracked: History log to be maintained                */
  T_DB_STATE          DBState;                        /* Database state                                       */

  T_FFS_FD            FFSFileHandle;                  /* FFS File Handle for DD_<db_handle>                   */

#ifdef FFS_CLOSE_BEFORE_OPEN
  FileHandleRecord READ_OPEN_FIELDS [MAX_OPEN_READ_PER_DB];   /* fields opened for read only                  */
  FileHandleRecord WRITE_OPEN_FIELDS [MAX_OPEN_WRITE_PER_DB]; /* fields opened for read/write both            */
  UBYTE  old_read;                                            /* remeber oldest open                          */
  UBYTE  old_write;                                           /* remeber oldest read                          */
#endif

  T_DBM_FIELDRECORD*  ptrFieldRecord;                 /* pointer to fields                                    */

} T_DBM_MASTERRECORD;

#endif