FreeBSD/Linux Kernel Cross Reference
sys/mips/include/counter.h

     /*-
      * Copyright (c) 2012 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
    
    #define counter_enter() critical_enter()
    #define counter_exit()  critical_exit()
    
    #ifdef IN_SUBR_COUNTER_C
    /* XXXKIB non-atomic 64bit read on 32bit */
    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 on 32bit, 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_rendezvous_barrier, counter_u64_zero_one_cpu,
                smp_no_rendezvous_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  /* ! __MACHINE_COUNTER_H__ */

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