include/asm-mips/sibyte/trace_prof.h

   1 /*
   2  * Copyright (C) 2001 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #ifndef __ASM_SIBYTE_TRACE_PROF_H
  20 #define __ASM_SIBYTE_TRACE_PROF_H
  21
  22 #undef DBG
  23 #if SBPROF_TB_DEBUG
  24 #define DBG(a) a
  25 #else
  26 #define DBG(a)
  27 #endif
  28
  29 #define SBPROF_TB_MAJOR 240
  30 #define DEVNAME "bcm1250_tbprof"
  31
  32 typedef u_int64_t tb_sample_t[6*256];
  33
  34 struct sbprof_tb {
  35         int          open;
  36         tb_sample_t *sbprof_tbbuf;
  37         int          next_tb_sample;
  38
  39         volatile int tb_enable;
  40         volatile int tb_armed;
  41
  42         wait_queue_head_t tb_sync;
  43         wait_queue_head_t tb_read;
  44 };
  45
  46 #define MAX_SAMPLE_BYTES (24*1024*1024)
  47 #define MAX_TBSAMPLE_BYTES (12*1024*1024)
  48
  49 #define MAX_SAMPLES (MAX_SAMPLE_BYTES/sizeof(u_int32_t))
  50 #define TB_SAMPLE_SIZE (sizeof(tb_sample_t))
  51 #define MAX_TB_SAMPLES (MAX_TBSAMPLE_BYTES/TB_SAMPLE_SIZE)
  52
  53 /* IOCTLs */
  54 #define SBPROF_ZBSTART          _IOW('s', 0, int)
  55 #define SBPROF_ZBSTOP           _IOW('s', 1, int)
  56 #define SBPROF_ZBWAITFULL       _IOW('s', 2, int)
  57
  58 /***************************************************************************
  59  * Routines for gathering ZBbus profiles using trace buffer
  60  ***************************************************************************/
  61
  62 /* Requires: Already called zclk_timer_init with a value that won't
  63              saturate 40 bits.  No subsequent use of SCD performance counters
  64              or trace buffer.
  65    Effect:   Starts gathering random ZBbus profiles using trace buffer. */
  66 extern int sbprof_zbprof_start(struct file *filp);
  67
  68 /* Effect: Stops collection of ZBbus profiles */
  69 extern int sbprof_zbprof_stop(void);
  70
  71
  72 /***************************************************************************
  73  * Routines for using 40-bit SCD cycle counter
  74  *
  75  * Client responsible for either handling interrupts or making sure
  76  * the cycles counter never saturates, e.g., by doing
  77  * zclk_timer_init(0) at least every 2^40 - 1 ZCLKs.
  78  ***************************************************************************/
  79
  80 /* Configures SCD counter 0 to count ZCLKs starting from val;
  81    Configures SCD counters1,2,3 to count nothing.
  82    Must not be called while gathering ZBbus profiles.
  83
  84 unsigned long long val; */
  85 #define zclk_timer_init(val) \
  86   __asm__ __volatile__ (".set push;" \
  87                         ".set mips64;" \
  88                         "la   $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \
  89                         "sd   %0, 0x10($8);"   /* write val to counter0 */ \
  90                         "sd   %1, 0($8);"      /* config counter0 for zclks*/ \
  91                         ".set pop" \
  92                         : /* no outputs */ \
  93                                                      /* enable, counter0 */ \
  94                         : /* inputs */ "r"(val), "r" ((1ULL << 33) | 1ULL) \
  95                         : /* modifies */ "$8" )
  96
  97
  98 /* Reads SCD counter 0 and puts result in value
  99    unsigned long long val; */
 100 #define zclk_get(val) \
 101   __asm__ __volatile__ (".set push;" \
 102                         ".set mips64;" \
 103                         "la   $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \
 104                         "ld   %0, 0x10($8);"   /* write val to counter0 */ \
 105                         ".set pop" \
 106                         : /* outputs */ "=r"(val) \
 107                         : /* inputs */ \
 108                         : /* modifies */ "$8" )
 109
 110 #endif /* __ASM_SIBYTE_TRACE_PROF_H */