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 * Copyright (C) 2002-2003 Hewlett-Packard Co
 *               Stephane Eranian <eranian@hpl.hp.com>
 * This file implements the default sampling buffer format
 * for Linux/ia64 perfmon subsystem.

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 * format specific parameters (passed at context creation)
typedef struct {
      unsigned long buf_size;       /* size of the buffer in bytes */
      unsigned int  flags;          /* buffer specific flags */
      unsigned int  res1;           /* for future use */
      unsigned long reserved[2];    /* for future use */
} pfm_default_smpl_arg_t;

 * combined context+format specific structure. Can be passed
typedef struct {
      pfarg_context_t         ctx_arg;
      pfm_default_smpl_arg_t  buf_arg;
} pfm_default_smpl_ctx_arg_t;

 * This header is at the beginning of the sampling buffer returned to the user.
 * It is directly followed by the first record.
typedef struct {
      unsigned long     hdr_count;        /* how many valid entries */
      unsigned long     hdr_cur_offs;           /* current offset from top of buffer */
      unsigned long     hdr_reserved2;          /* reserved for future use */

      unsigned long     hdr_overflows;          /* how many times the buffer overflowed */
      unsigned long   hdr_buf_size;       /* how many bytes in the buffer */

      unsigned int      hdr_version;            /* contains perfmon version (smpl format diffs) */
      unsigned int      hdr_reserved1;          /* for future use */
      unsigned long     hdr_reserved[10]; /* for future use */
} pfm_default_smpl_hdr_t;

 * Entry header in the sampling buffer.  The header is directly followed
 * with the values of the PMD registers of interest saved in increasing 
 * index order: PMD4, PMD5, and so on. How many PMDs are present depends 
 * on how the session was programmed.
 * In the case where multiple counters overflow at the same time, multiple
 * entries are written consecutively.
 * last_reset_value member indicates the initial value of the overflowed PMD. 
typedef struct {
        int             pid;                    /* thread id (for NPTL, this is gettid()) */
        unsigned char   reserved1[3];           /* reserved for future use */
        unsigned char   ovfl_pmd;               /* index of overflowed PMD */

        unsigned long   last_reset_val;         /* initial value of overflowed PMD */
        unsigned long   ip;                     /* where did the overflow interrupt happened  */
        unsigned long   tstamp;                 /* ar.itc when entering perfmon intr. handler */

        unsigned short  cpu;                    /* cpu on which the overfow occured */
        unsigned short  set;                    /* event set active when overflow ocurred   */
        int             tgid;                   /* thread group id (for NPTL, this is getpid()) */
} pfm_default_smpl_entry_t;

#define PFM_DEFAULT_MAX_PMDS        64 /* how many pmds supported by data structures (sizeof(unsigned long) */
#define PFM_DEFAULT_MAX_ENTRY_SIZE  (sizeof(pfm_default_smpl_entry_t)+(sizeof(unsigned long)*PFM_DEFAULT_MAX_PMDS))
#define PFM_DEFAULT_SMPL_MIN_BUF_SIZE     (sizeof(pfm_default_smpl_hdr_t)+PFM_DEFAULT_MAX_ENTRY_SIZE)


#endif /* __PERFMON_DEFAULT_SMPL_H__ */

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