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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 :  GPRS (8441)
|  Modul   :  GRR
+----------------------------------------------------------------------------- 
|  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. 
+----------------------------------------------------------------------------- 
|  Purpose :  Definitions for service MEAS.
+----------------------------------------------------------------------------- 
*/ 

#ifndef GRR_MEASS_H
#define GRR_MEASS_H

/* Constants */

#define NO_PAGING               0xFFFFFFFF

/* CTRL Signals */

EXTERN void sig_ctrl_meas_int_list_invalid   ( void );
  
EXTERN void sig_ctrl_meas_int_list_valid     ( void );

EXTERN void sig_ctrl_meas_ext_invalid_psi5   ( void );
 
EXTERN void sig_ctrl_meas_ext_valid_psi5     ( void );

EXTERN void sig_ctrl_meas_pim                ( void );

EXTERN void sig_ctrl_meas_pam                ( void );

EXTERN void sig_ctrl_meas_ptm                ( void );

EXTERN void sig_ctrl_meas_start              ( void );

EXTERN void sig_ctrl_meas_stop               ( void );

EXTERN void sig_ctrl_meas_suspend            ( void );

EXTERN void sig_ctrl_meas_resume             ( void );

EXTERN void sig_ctrl_meas_pmr_accept         ( void );

EXTERN void sig_ctrl_meas_pmr_reject         ( void );

EXTERN void sig_ctrl_meas_ext_meas_cnf       ( T_RRGRR_EXT_MEAS_CNF *rrgrr_ext_meas_cnf );

EXTERN void sig_ctrl_meas_ba_changed         ( void );

/* CS Signals */

EXTERN void sig_cs_meas_start                ( void );

EXTERN void sig_cs_meas_stop                 ( void );

/* GFP Signals */

EXTERN void sig_gfp_meas_order               ( void );

EXTERN void sig_gfp_meas_int_meas_stop_con   ( T_MPHP_INT_MEAS_STOP_CON * dummy );

EXTERN void sig_gfp_meas_int_meas_ind        ( T_MPHP_INT_MEAS_IND * mphp_int_meas_ind );

EXTERN void sig_gfp_meas_rxlev_pccch_ind     ( UBYTE pccch_lev );

EXTERN void sig_gfp_meas_ctrl_pwr_ta_ptm     ( void );

/* TC Signals */

EXTERN void sig_tc_meas_update_pch           ( void );

/* Access Functions */

EXTERN void   meas_init                 ( T_MEAS_IM_MODE        im_mode_i );
  
EXTERN void   meas_im_get_rel_i_level   ( T_MEAS_IM_CARRIER    *ma,
                                          T_ilev               *i_level   );

EXTERN UBYTE  meas_im_get_abs_i_level   ( T_MEAS_IM_CARRIER    *ma,
                                          T_ilev_abs           *i_level   );

EXTERN void   meas_im_set_carrier       ( T_MEAS_IM_CARRIER    *carrier,
                                          T_p_frequency_par    *freq_par  );

EXTERN ULONG  meas_im_get_drx_period_seconds
                                        ( void                            );

EXTERN USHORT meas_im_get_drx_period_frames
                                        ( void                            );

EXTERN UBYTE  meas_im_get_permit        ( void                            );

EXTERN UBYTE  meas_c_get_value          ( void                            );

EXTERN void   meas_c_get_c_value        ( T_CGRLC_c_value      *c_value   );

EXTERN void   meas_c_set_c_value        ( T_CGRLC_c_value      *c_value   );

#endif /* !GRR_MEASS_H */