106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*-
|
|
* Copyright (c) 2003-2007 Joseph Koshy
|
|
* Copyright (c) 2007 The FreeBSD Foundation
|
|
* All rights reserved.
|
|
*
|
|
* Portions of this software were developed by A. Joseph Koshy under
|
|
* sponsorship from the FreeBSD Foundation and Google, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_hwpmc_hooks.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/pmc.h>
|
|
#include <sys/pmckern.h>
|
|
#include <sys/smp.h>
|
|
|
|
#ifdef HWPMC_HOOKS
|
|
#define PMC_KERNEL_VERSION PMC_VERSION
|
|
#else
|
|
#define PMC_KERNEL_VERSION 0
|
|
#endif
|
|
|
|
const int pmc_kernel_version = PMC_KERNEL_VERSION;
|
|
|
|
/* Hook variable. */
|
|
int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL;
|
|
|
|
/* Interrupt handler */
|
|
int (*pmc_intr)(int cpu, struct trapframe *tf) = NULL;
|
|
|
|
/* Bitmask of CPUs requiring servicing at hardclock time */
|
|
volatile cpumask_t pmc_cpumask;
|
|
|
|
/*
|
|
* A global count of SS mode PMCs. When non-zero, this means that
|
|
* we have processes that are sampling the system as a whole.
|
|
*/
|
|
volatile int pmc_ss_count;
|
|
|
|
/*
|
|
* Since PMC(4) may not be loaded in the current kernel, the
|
|
* convention followed is that a non-NULL value of 'pmc_hook' implies
|
|
* the presence of this kernel module.
|
|
*
|
|
* This requires us to protect 'pmc_hook' with a
|
|
* shared (sx) lock -- thus making the process of calling into PMC(4)
|
|
* somewhat more expensive than a simple 'if' check and indirect call.
|
|
*/
|
|
struct sx pmc_sx;
|
|
|
|
static void
|
|
pmc_init_sx(void)
|
|
{
|
|
sx_init_flags(&pmc_sx, "pmc-sx", SX_NOWITNESS);
|
|
}
|
|
|
|
SYSINIT(pmcsx, SI_SUB_LOCK, SI_ORDER_MIDDLE, pmc_init_sx, NULL);
|
|
|
|
/*
|
|
* Helper functions
|
|
*/
|
|
|
|
int
|
|
pmc_cpu_is_disabled(int cpu)
|
|
{
|
|
#ifdef SMP
|
|
return ((hlt_cpus_mask & (1 << cpu)) != 0);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int
|
|
pmc_cpu_is_logical(int cpu)
|
|
{
|
|
#ifdef SMP
|
|
return ((logical_cpus_mask & (1 << cpu)) != 0);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|