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/*-
* Copyright (c) 2012, 2013 Konstantin Belousov <kib@FreeBSD.org>
* 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.
*
* $FreeBSD$
*/
#ifndef __MACHINE_COUNTER_H__
#define __MACHINE_COUNTER_H__
#include <sys/pcpu.h>
#ifdef INVARIANTS
#include <sys/proc.h>
#endif
#if defined(AIM) && defined(__powerpc64__)
#define counter_enter() do {} while (0)
#define counter_exit() do {} while (0)
#ifdef IN_SUBR_COUNTER_C
static inline uint64_t
counter_u64_read_one(uint64_t *p, int cpu)
{
return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu));
}
static inline uint64_t
counter_u64_fetch_inline(uint64_t *p)
{
uint64_t r;
int i;
r = 0;
for (i = 0; i < mp_ncpus; i++)
r += counter_u64_read_one((uint64_t *)p, i);
return (r);
}
static void
counter_u64_zero_one_cpu(void *arg)
{
*((uint64_t *)((char *)arg + sizeof(struct pcpu) *
PCPU_GET(cpuid))) = 0;
}
static inline void
counter_u64_zero_inline(counter_u64_t c)
{
smp_rendezvous(smp_no_rendevous_barrier, counter_u64_zero_one_cpu,
smp_no_rendevous_barrier, c);
}
#endif
#define counter_u64_add_protected(c, i) counter_u64_add(c, i)
extern struct pcpu __pcpu[MAXCPU];
static inline void
counter_u64_add(counter_u64_t c, int64_t inc)
{
uint64_t ccpu, old;
__asm __volatile("\n"
"1:\n\t"
"mfsprg %0, 0\n\t"
"ldarx %1, %0, %2\n\t"
"add %1, %1, %3\n\t"
"stdcx. %1, %0, %2\n\t"
"bne- 1b"
: "=&b" (ccpu), "=&r" (old)
: "r" ((char *)c - (char *)&__pcpu[0]), "r" (inc)
: "cc", "memory");
}
#else /* !AIM || !64bit */
#define counter_enter() critical_enter()
#define counter_exit() critical_exit()
#ifdef IN_SUBR_COUNTER_C
/* XXXKIB non-atomic 64bit read */
static inline uint64_t
counter_u64_read_one(uint64_t *p, int cpu)
{
return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu));
}
static inline uint64_t
counter_u64_fetch_inline(uint64_t *p)
{
uint64_t r;
int i;
r = 0;
for (i = 0; i < mp_ncpus; i++)
r += counter_u64_read_one((uint64_t *)p, i);
return (r);
}
/* XXXKIB non-atomic 64bit store, might interrupt increment */
static void
counter_u64_zero_one_cpu(void *arg)
{
*((uint64_t *)((char *)arg + sizeof(struct pcpu) *
PCPU_GET(cpuid))) = 0;
}
static inline void
counter_u64_zero_inline(counter_u64_t c)
{
smp_rendezvous(smp_no_rendevous_barrier, counter_u64_zero_one_cpu,
smp_no_rendevous_barrier, c);
}
#endif
#define counter_u64_add_protected(c, inc) do { \
CRITICAL_ASSERT(curthread); \
*(uint64_t *)zpcpu_get(c) += (inc); \
} while (0)
static inline void
counter_u64_add(counter_u64_t c, int64_t inc)
{
counter_enter();
counter_u64_add_protected(c, inc);
counter_exit();
}
#endif /* AIM 64bit */
#endif /* ! __MACHINE_COUNTER_H__ */
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