include/asm-mips64/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 #if SBPROF_TB_DEBUG
  23 #define DBG(a) a
  24 #else
  25 #define DBG(a)
  26 #endif
  27
  28 #define SBPROF_TB_MAJOR 240
  29 #define DEVNAME "bcm1250_tbprof"
  30
  31 typedef u_int64_t tb_sample_t[6*256];
  32
  33 struct sbprof_tb {
  34         int          open;
  35         tb_sample_t *sbprof_tbbuf;
  36         int          next_tb_sample;
  37
  38         volatile int tb_enable;
  39         volatile int tb_armed;
  40
  41         wait_queue_head_t tb_sync;
  42         wait_queue_head_t tb_read;
  43 };
  44
  45 #define MAX_SAMPLE_BYTES (24*1024*1024)
  46 #define MAX_TBSAMPLE_BYTES (12*1024*1024)
  47
  48 #define MAX_SAMPLES (MAX_SAMPLE_BYTES/sizeof(u_int32_t))
  49 #define TB_SAMPLE_SIZE (sizeof(tb_sample_t))
  50 #define MAX_TB_SAMPLES (MAX_TBSAMPLE_BYTES/TB_SAMPLE_SIZE)
  51
  52 /* IOCTLs */
  53 #define SBPROF_ZBSTART          _IOW('s', 0, int)
  54 #define SBPROF_ZBSTOP           _IOW('s', 1, int)
  55 #define SBPROF_ZBWAITFULL       _IOW('s', 2, int)
  56
  57 /***************************************************************************
  58  * Routines for gathering ZBbus profiles using trace buffer
  59  ***************************************************************************/
  60
  61 /* Requires: Already called zclk_timer_init with a value that won't
  62              saturate 40 bits.  No subsequent use of SCD performance counters
  63              or trace buffer.
  64    Effect:   Starts gathering random ZBbus profiles using trace buffer. */
  65 static int sbprof_zbprof_start(struct file *filp);
  66
  67 /* Effect: Stops collection of ZBbus profiles */
  68 static int sbprof_zbprof_stop(void);
  69
  70
  71 /***************************************************************************
  72  * Routines for using 40-bit SCD cycle counter
  73  *
  74  * Client responsible for either handling interrupts or making sure
  75  * the cycles counter never saturates, e.g., by doing
  76  * zclk_timer_init(0) at least every 2^40 - 1 ZCLKs.
  77  ***************************************************************************/
  78
  79 /* Configures SCD counter 0 to count ZCLKs starting from val;
  80    Configures SCD counters1,2,3 to count nothing.
  81    Must not be called while gathering ZBbus profiles.
  82
  83 unsigned long long val; */
  84 #define zclk_timer_init(val) \
  85   __asm__ __volatile__ (".set push;" \
  86                         ".set mips64;" \
  87                         "la   $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \
  88                         "sd   %0, 0x10($8);"   /* write val to counter0 */ \
  89                         "sd   %1, 0($8);"      /* config counter0 for zclks*/ \
  90                         ".set pop" \
  91                         : /* no outputs */ \
  92                                                      /* enable, counter0 */ \
  93                         : /* inputs */ "r"(val), "r" ((1ULL << 33) | 1ULL) \
  94                         : /* modifies */ "$8" )
  95
  96
  97 /* Reads SCD counter 0 and puts result in value
  98    unsigned long long val; */
  99 #define zclk_get(val) \
 100   __asm__ __volatile__ (".set push;" \
 101                         ".set mips64;" \
 102                         "la   $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \
 103                         "ld   %0, 0x10($8);"   /* write val to counter0 */ \
 104                         ".set pop" \
 105                         : /* outputs */ "=r"(val) \
 106                         : /* inputs */ \
 107                         : /* modifies */ "$8" )
 108
 109 #endif /* __ASM_SIBYTE_TRACE_PROF_H */