FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/pmu.c

     /*-
      * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * This software was developed by SRI International and the University of
      * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
      * ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * 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.
     */
    
    /*
     * Performance Monitoring Unit
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_hwpmc_hooks.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/rman.h>
    #include <sys/timeet.h>
    #include <sys/timetc.h>
    #include <sys/pmc.h>
    #include <sys/pmckern.h>
    
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/intr.h>
    
    #include "pmu.h"
    
    /* CCNT */
    #if defined(__arm__) && (__ARM_ARCH > 6)
    int pmu_attched = 0;
    uint32_t ccnt_hi[MAXCPU];
    #endif
    
    #define PMU_OVSR_C              0x80000000      /* Cycle Counter */
    #define PMU_IESR_C              0x80000000      /* Cycle Counter */
    
    static int
    pmu_intr(void *arg)
    {
    #ifdef HWPMC_HOOKS
            struct trapframe *tf;
    #endif
            uint32_t r;
    #if defined(__arm__) && (__ARM_ARCH > 6)
            u_int cpu;
    
            cpu = PCPU_GET(cpuid);
    
            r = cp15_pmovsr_get();
            if (r & PMU_OVSR_C) {
                    atomic_add_32(&ccnt_hi[cpu], 1);
                    /* Clear the event. */
                    r &= ~PMU_OVSR_C;
                    cp15_pmovsr_set(PMU_OVSR_C);
            }
    #else
            r = 1;
    #endif
    
    #ifdef HWPMC_HOOKS
            /* Only call into the HWPMC framework if we know there is work. */
            if (r != 0 && pmc_intr) {
                    tf = arg;
                    (*pmc_intr)(tf);
            }
    #endif
    
            return (FILTER_HANDLED);
    }
   
   int
   pmu_attach(device_t dev)
   {
           struct pmu_softc *sc;
   #if defined(__arm__) && (__ARM_ARCH > 6)
           uint32_t iesr;
   #endif
           int err, i;
   
           sc = device_get_softc(dev);
           sc->dev = dev;
   
           for (i = 0; i < MAX_RLEN; i++) {
                   if (sc->irq[i].res == NULL)
                           break;
                   err = bus_setup_intr(dev, sc->irq[i].res,
                       INTR_MPSAFE | INTR_TYPE_MISC, pmu_intr, NULL, NULL,
                       &sc->irq[i].ih);
                   if (err != 0) {
                           device_printf(dev,
                               "Unable to setup interrupt handler.\n");
                           goto fail;
                   }
                   if (sc->irq[i].cpuid != -1) {
                           err = bus_bind_intr(dev, sc->irq[i].res,
                               sc->irq[i].cpuid);
                           if (err != 0) {
                                   device_printf(sc->dev,
                                       "Unable to bind interrupt.\n");
                                   goto fail;
                           }
                   }
           }
   
   #if defined(__arm__) && (__ARM_ARCH > 6)
           /* Initialize to 0. */
           for (i = 0; i < MAXCPU; i++)
                   ccnt_hi[i] = 0;
   
           /* Enable the interrupt to fire on overflow. */
           iesr = cp15_pminten_get();
           iesr |= PMU_IESR_C;
           cp15_pminten_set(iesr);
   
           /* Need this for getcyclecount() fast path. */
           pmu_attched |= 1;
   #endif
   
           return (0);
   
   fail:
           for (i = 1; i < MAX_RLEN; i++) {
                   if (sc->irq[i].ih != NULL)
                           bus_teardown_intr(dev, sc->irq[i].res, sc->irq[i].ih);
                   if (sc->irq[i].res != NULL)
                           bus_release_resource(dev, SYS_RES_IRQ, i,
                               sc->irq[i].res);
           }
           return(err);
   }
   

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