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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 35f7a1dc9f7d
children
line wrap: on
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/*
+--------------------------------------------------------------------------+
| PROJECT : PROTOCOL STACK                                                 |
| FILE    : p_ipa.val                                                      |
| SOURCE  : "sap\ipa.pdf"                                                  |
| LastModified : "2003-08-30"                                              |
| IdAndVersion : "8444.104.02.007"                                         |
| SrcFileTime  : "Thu Nov 29 09:43:54 2007"                                |
| Generated by CCDGEN_2.5.5A on Fri Oct 14 21:41:52 2016                   |
|           !!DO NOT MODIFY!!DO NOT MODIFY!!DO NOT MODIFY!!                |
+--------------------------------------------------------------------------+
*/

/* PRAGMAS
 * PREFIX                 : NONE
 * COMPATIBILITY_DEFINES  : NO (require PREFIX)
 * ALWAYS_ENUM_IN_VAL_FILE: NO
 * ENABLE_GROUP: NO
 * CAPITALIZE_TYPENAME: NO
 */


#ifndef P_IPA_VAL
#define P_IPA_VAL


#define CDG_ENTER__P_IPA_VAL

#define CDG_ENTER__FILENAME _P_IPA_VAL
#define CDG_ENTER__P_IPA_VAL__FILE_TYPE CDGINC
#define CDG_ENTER__P_IPA_VAL__LAST_MODIFIED _2003_08_30
#define CDG_ENTER__P_IPA_VAL__ID_AND_VERSION _8444_104_02_007

#define CDG_ENTER__P_IPA_VAL__SRC_FILE_TIME _Thu_Nov_29_09_43_54_2007

#include "CDG_ENTER.h"

#undef CDG_ENTER__P_IPA_VAL

#undef CDG_ENTER__FILENAME


/*
 * Value constants for VAL_dti_conn
 */
#define IPA_CONNECT_DTI                (0x0)      /* Connect DTI2 to IP             */
#define IPA_DISCONNECT_DTI             (0x1)      /* Disconnect DTI2 from IP        */

/*
 * Value constants for VAL_link_id
 */
#define IPA_LINK_ID_DEFAULT            (0x0)      /* Default link id                */

/*
 * Value constants for VAL_dti_direction
 */
#define IPA_DTI_TO_HIGHER_LAYER        (0x0)      /* DTI2 used normally             */
#define IPA_DTI_TO_LOWER_LAYER         (0x1)      /* DTI2 is inverted               */

/*
 * Value constants for VAL_cmd
 */
#define IPA_CONFIG_UP                  (0x0)      /* enable the interface           */
#define IPA_CONFIG_DOWN                (0x1)      /* disable the interface          */

/*
 * Value constants for VAL_ack_flag
 */
#define IPA_CONFIG_ACK                 (0x0)      /* Acknowledged                   */
#define IPA_CONFIG_NAK                 (0x1)      /* not acknowledged               */

/*
 * Value constants for VAL_all_down
 */
#define IPA_ALLDOWN_FALSE              (0x0)      /* >= 1 Interface still up        */
#define IPA_ALLDOWN_TRUE               (0x1)      /* all interfaces down            */

/*
 * user defined constants
 */
#define IPA_ENTITY_NAME_LEN            (0x6)      

#include "CDG_LEAVE.h"


#endif