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/*-
* Copyright (c) 2003, Joseph Koshy
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
/*
* PMC interface used by the base kernel.
*/
#ifndef _SYS_PMCKERN_H_
#define _SYS_PMCKERN_H_
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/proc.h>
#include <sys/sx.h>
#define PMC_FN_PROCESS_EXIT 1
#define PMC_FN_PROCESS_EXEC 2
#define PMC_FN_PROCESS_FORK 3
#define PMC_FN_CSW_IN 4
#define PMC_FN_CSW_OUT 5
/* hook */
extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
extern int (*pmc_intr)(int cpu, uintptr_t pc);
/* SX lock protecting the hook */
extern struct sx pmc_sx;
/* hook invocation; for use within the kernel */
#define PMC_CALL_HOOK(t, cmd, arg) \
do { \
sx_slock(&pmc_sx); \
if (pmc_hook != NULL) \
(pmc_hook)((t), (cmd), (arg)); \
sx_sunlock(&pmc_sx); \
} while (0)
/* hook invocation that needs an exclusive lock */
#define PMC_CALL_HOOK_X(t, cmd, arg) \
do { \
sx_xlock(&pmc_sx); \
if (pmc_hook != NULL) \
(pmc_hook)((t), (cmd), (arg)); \
sx_xunlock(&pmc_sx); \
} while (0)
/* context switches cannot take locks */
#define PMC_SWITCH_CONTEXT(t, cmd) \
do { \
if (pmc_hook != NULL) \
(pmc_hook)((t), (cmd), NULL); \
} while (0)
/*
* check if a process is using HWPMCs.
*/
#define PMC_PROC_IS_USING_PMCS(p) \
(__predict_false(atomic_load_acq_int(&(p)->p_flag) & \
P_HWPMC))
/* helper functions */
int pmc_cpu_is_disabled(int _cpu);
int pmc_cpu_is_logical(int _cpu);
#endif /* _SYS_PMCKERN_H_ */
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