arch/powerpc/oprofile/cell/pr_util.h

   1  /*
   2  * Cell Broadband Engine OProfile Support
   3  *
   4  * (C) Copyright IBM Corporation 2006
   5  *
   6  * Author: Maynard Johnson <maynardj@us.ibm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the License, or (at your option) any later version.
  12  */
  13
  14 #ifndef PR_UTIL_H
  15 #define PR_UTIL_H
  16
  17 #include <linux/cpumask.h>
  18 #include <linux/oprofile.h>
  19 #include <asm/cell-pmu.h>
  20 #include <asm/cell-regs.h>
  21 #include <asm/spu.h>
  22
  23 /* Defines used for sync_start */
  24 #define SKIP_GENERIC_SYNC 0
  25 #define SYNC_START_ERROR -1
  26 #define DO_GENERIC_SYNC 1
  27 #define SPUS_PER_NODE   8
  28 #define DEFAULT_TIMER_EXPIRE  (HZ / 10)
  29
  30 extern struct delayed_work spu_work;
  31 extern int spu_prof_running;
  32
  33 struct spu_overlay_info {       /* map of sections within an SPU overlay */
  34         unsigned int vma;       /* SPU virtual memory address from elf */
  35         unsigned int size;      /* size of section from elf */
  36         unsigned int offset;    /* offset of section into elf file */
  37         unsigned int buf;
  38 };
  39
  40 struct vma_to_fileoffset_map {  /* map of sections within an SPU program */
  41         struct vma_to_fileoffset_map *next;     /* list pointer */
  42         unsigned int vma;       /* SPU virtual memory address from elf */
  43         unsigned int size;      /* size of section from elf */
  44         unsigned int offset;    /* offset of section into elf file */
  45         unsigned int guard_ptr;
  46         unsigned int guard_val;
  47         /*
  48          * The guard pointer is an entry in the _ovly_buf_table,
  49          * computed using ovly.buf as the index into the table.  Since
  50          * ovly.buf values begin at '1' to reference the first (or 0th)
  51          * entry in the _ovly_buf_table, the computation subtracts 1
  52          * from ovly.buf.
  53          * The guard value is stored in the _ovly_buf_table entry and
  54          * is an index (starting at 1) back to the _ovly_table entry
  55          * that is pointing at this _ovly_buf_table entry.  So, for
  56          * example, for an overlay scenario with one overlay segment
  57          * and two overlay sections:
  58          *      - Section 1 points to the first entry of the
  59          *        _ovly_buf_table, which contains a guard value
  60          *        of '1', referencing the first (index=0) entry of
  61          *        _ovly_table.
  62          *      - Section 2 points to the second entry of the
  63          *        _ovly_buf_table, which contains a guard value
  64          *        of '2', referencing the second (index=1) entry of
  65          *        _ovly_table.
  66          */
  67
  68 };
  69
  70 struct spu_buffer {
  71         int last_guard_val;
  72         int ctx_sw_seen;
  73         unsigned long *buff;
  74         unsigned int head, tail;
  75 };
  76
  77
  78 /* The three functions below are for maintaining and accessing
  79  * the vma-to-fileoffset map.
  80  */
  81 struct vma_to_fileoffset_map *create_vma_map(const struct spu *spu,
  82                                              u64 objectid);
  83 unsigned int vma_map_lookup(struct vma_to_fileoffset_map *map,
  84                             unsigned int vma, const struct spu *aSpu,
  85                             int *grd_val);
  86 void vma_map_free(struct vma_to_fileoffset_map *map);
  87
  88 /*
  89  * Entry point for SPU profiling.
  90  * cycles_reset is the SPU_CYCLES count value specified by the user.
  91  */
  92 int start_spu_profiling_cycles(unsigned int cycles_reset);
  93
  94 void stop_spu_profiling_cycles(void);
  95
  96
  97 /* add the necessary profiling hooks */
  98 int spu_sync_start(void);
  99
 100 /* remove the hooks */
 101 int spu_sync_stop(void);
 102
 103 /* Record SPU program counter samples to the oprofile event buffer. */
 104 void spu_sync_buffer(int spu_num, unsigned int *samples,
 105                      int num_samples);
 106
 107 void set_spu_profiling_frequency(unsigned int freq_khz, unsigned int cycles_reset);
 108
 109 #endif    /* PR_UTIL_H */