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/*-
* 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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