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view src/g23m-gprs/sm/sm_mm_output_handler.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 :  3G PS
|  Module  :  SM
+-----------------------------------------------------------------------------
|             Copyright 2003 Texas Instruments.
|             All rights reserved. 
| 
|             This file is confidential and a trade secret of Texas 
|             Instruments .
|             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. 
+-----------------------------------------------------------------------------
| Purpose:    Output functions for primitives from SM to the MM entity.
|             For design details, see:
|             8010.908 SM Detailed Specification
+---------------------------------------------------------------------------*/

/*==== DECLARATION CONTROL =================================================*/

#ifndef SM_MM_OUTPUT_HANDLER_H
#define SM_MM_OUTPUT_HANDLER_H

/*==== INCLUDES =============================================================*/

#include "sm.h"

/*==== CONSTS ===============================================================*/

/*==== TYPES ================================================================*/

/*==== EXPORTS ==============================================================*/

/* Primitive sending functions */
extern void send_mmpm_pdp_context_status_req(void);

#if 0 /* Not used directly - only by message sending functions below */
extern void send_mmpm_unitdata_req(U8 ti, U8 est_cause, /*@only@*/ /*@null@*/T_MMPM_UNITDATA_REQ *prim);
#endif
extern void resend_msg(struct T_SM_CONTEXT_DATA *context);

/* Air Interface Message formatting functions */
extern void send_msg_activate_pdp_context_request(struct T_SM_CONTEXT_DATA *context);
extern void send_msg_activate_secondary_pdp_context_request(struct T_SM_CONTEXT_DATA *context);
extern void send_msg_deactivate_pdp_context_accept(struct T_SM_CONTEXT_DATA *context);
extern void send_msg_deactivate_pdp_context_request(struct T_SM_CONTEXT_DATA *context, /*@partial@*/T_CAUSE_ps_cause *cause, BOOL tear_down);
extern void send_msg_modify_pdp_context_accept(struct T_SM_CONTEXT_DATA *context);
extern void send_msg_modify_pdp_context_request(struct T_SM_CONTEXT_DATA *context);
extern void send_msg_request_pdp_context_activation_reject(struct T_SM_CONTEXT_DATA *context, /*@partial@*/T_CAUSE_ps_cause *cause);
extern void send_msg_sm_status(U8 ti, /*@partial@*/T_CAUSE_ps_cause *cause);

#endif /* SM_MM_OUTPUT_HANDLER_H */
/*==== END OF FILE ==========================================================*/