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
  28 struct spu_overlay_info {       /* map of sections within an SPU overlay */
  29         unsigned int vma;       /* SPU virtual memory address from elf */
  30         unsigned int size;      /* size of section from elf */
  31         unsigned int offset;    /* offset of section into elf file */
  32         unsigned int buf;
  33 };
  34
  35 struct vma_to_fileoffset_map {  /* map of sections within an SPU program */
  36         struct vma_to_fileoffset_map *next;     /* list pointer */
  37         unsigned int vma;       /* SPU virtual memory address from elf */
  38         unsigned int size;      /* size of section from elf */
  39         unsigned int offset;    /* offset of section into elf file */
  40         unsigned int guard_ptr;
  41         unsigned int guard_val;
  42         /*
  43          * The guard pointer is an entry in the _ovly_buf_table,
  44          * computed using ovly.buf as the index into the table.  Since
  45          * ovly.buf values begin at '1' to reference the first (or 0th)
  46          * entry in the _ovly_buf_table, the computation subtracts 1
  47          * from ovly.buf.
  48          * The guard value is stored in the _ovly_buf_table entry and
  49          * is an index (starting at 1) back to the _ovly_table entry
  50          * that is pointing at this _ovly_buf_table entry.  So, for
  51          * example, for an overlay scenario with one overlay segment
  52          * and two overlay sections:
  53          *      - Section 1 points to the first entry of the
  54          *        _ovly_buf_table, which contains a guard value
  55          *        of '1', referencing the first (index=0) entry of
  56          *        _ovly_table.
  57          *      - Section 2 points to the second entry of the
  58          *        _ovly_buf_table, which contains a guard value
  59          *        of '2', referencing the second (index=1) entry of
  60          *        _ovly_table.
  61          */
  62
  63 };
  64
  65 /* The three functions below are for maintaining and accessing
  66  * the vma-to-fileoffset map.
  67  */
  68 struct vma_to_fileoffset_map *create_vma_map(const struct spu *spu,
  69                                              u64 objectid);
  70 unsigned int vma_map_lookup(struct vma_to_fileoffset_map *map,
  71                             unsigned int vma, const struct spu *aSpu,
  72                             int *grd_val);
  73 void vma_map_free(struct vma_to_fileoffset_map *map);
  74
  75 /*
  76  * Entry point for SPU profiling.
  77  * cycles_reset is the SPU_CYCLES count value specified by the user.
  78  */
  79 int start_spu_profiling(unsigned int cycles_reset);
  80
  81 void stop_spu_profiling(void);
  82
  83
  84 /* add the necessary profiling hooks */
  85 int spu_sync_start(void);
  86
  87 /* remove the hooks */
  88 int spu_sync_stop(void);
  89
  90 /* Record SPU program counter samples to the oprofile event buffer. */
  91 void spu_sync_buffer(int spu_num, unsigned int *samples,
  92                      int num_samples);
  93
  94 void set_spu_profiling_frequency(unsigned int freq_khz, unsigned int cycles_reset);
  95
  96 #endif    /* PR_UTIL_H */