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/* -*- linux-c -*-
* Perf Functions
* Copyright (C) 2006 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _PERF_C_
#define _PERF_C_
#include <linux/perfmon.h>
#include "perf.h"
/** @file perf.c
* @brief Implements performance monitoring hardware support
*/
/* TODO fix so this works on SMP machines
* Need to do context load, register setup, and start on each processor
*
* Similarly need to stop and unload on each processor
*/
/* TODO make this work with sampling. There needs to be a help thread
* handling the sampling. */
static int _stp_pfm_register_setup(void *desc,
struct pfarg_pmc pmc[], int pmc_count,
struct pfarg_pmd pmd[], int pmd_count)
{
int err = 0;
if (desc == 0) return -EINVAL;
err = pfmk_write_pmcs(desc, pmc, pmc_count);
if (err) return err;
err = pfmk_write_pmds(desc, pmd, pmd_count);
return err;
}
static struct completion c;
static struct pfarg_load load_args;
static struct pfarg_start start_args;
/** Sets up the performance monitoring hardware.
* The locations desc and context point to are modified as
* side-effects of the setup. desc is a unique pointer used
* by the various routines.
* @param desc pointer to void *, handle to describe perfmon config
* @param context pointer to context information
* @param pmc, pointer to array describing control register setup
* @param pmc_count, number of entries in pmc
* @param pmd, pointer to array describing data register setup
* @param pmd_count, number of entries in pmd
* @returns an int, 0 if no errors encountered during setup
*/
static int _stp_perfmon_setup(void **desc,
struct pfarg_ctx *context,
struct pfarg_pmc pmc[], int pmc_count,
struct pfarg_pmd pmd[], int pmd_count)
{
int err = 0;
/* create a context */
err = pfmk_create_context(context, NULL, 0, &c, desc, NULL);
if (err) goto cleanup;
/* set up the counters */
err = _stp_pfm_register_setup(*desc, pmc, pmc_count, pmd, pmd_count);
if (err) goto cleanup2;
/* start measuring */
err = pfmk_load_context(*desc, &load_args);
if (err) {
printk("pfmk_load_context error\n");
goto cleanup2;
}
err = pfmk_start(*desc, &start_args);
if (err) {
printk("pfmk_start error\n");
goto cleanup3;
}
return err;
cleanup3: pfmk_unload_context(*desc);
cleanup2: pfmk_close(*desc);
cleanup: *desc=NULL;
return err;
}
/** Shuts down the performance monitoring hardware.
* @param desc unique pointer to describe configuration
* @returns an int, 0 if no errors encountered during shutdown
*/
static int _stp_perfmon_shutdown(void *desc)
{
int err=0;
if (desc == 0) return -EINVAL;
/* stop the counters */
err=pfmk_stop(desc);
if (err) return err;
err=pfmk_unload_context(desc);
if (err) return err;
err=pfmk_close(desc);
return err;
}
/** Reads the performance counter
* @param desc unique pointer to describe configuration
* @returns an int64, raw value of counter
*/
static int64_t _stp_perfmon_read(void *desc, int counter)
{
struct pfarg_pmd storage;
storage.reg_set = 0;
storage.reg_num = counter;
if ( desc != NULL) {
if (pfmk_read_pmds(desc, &storage, 1))
printk( "pfm_read_pmds error\n");
}
return storage.reg_value;
}
#endif /* _PERF_C_ */
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