arm/pmu: add ACPI attachment.
This makes hwpmc(4) sampling work on ACPI-based AArch64 systems. Tested on ARM Neoverse N1. Submitted by: Greg V <greg@unrelenting.technology> Reviewed by: jrtc27, mhorne Differential Revision: https://reviews.freebsd.org/D24423
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Ruslan Bukin
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4e057806cf
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4bb6991531
@ -33,7 +33,7 @@
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#ifndef _ARM_PMU_H_
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#define _ARM_PMU_H_
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#define MAX_RLEN 8
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#define MAX_RLEN MAXCPU
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struct pmu_intr {
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struct resource *res;
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195
sys/arm/arm/pmu_acpi.c
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195
sys/arm/arm/pmu_acpi.c
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@ -0,0 +1,195 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Greg V <greg@unrelenting.technology>
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* Copyright (c) 2021 Ruslan Bukin <br@bsdpad.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <dev/acpica/acpivar.h>
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#include "acpi_bus_if.h"
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#include "pmu.h"
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struct madt_ctx {
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struct pmu_softc *sc;
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int error;
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int i;
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};
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static void
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madt_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
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{
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ACPI_MADT_GENERIC_INTERRUPT *intr;
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struct intr_map_data_acpi *ad;
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struct intr_map_data *data;
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struct madt_ctx *ctx;
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struct pmu_softc *sc;
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struct pcpu *pcpu;
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int rid;
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int cpuid;
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int i;
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ctx = arg;
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sc = ctx->sc;
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rid = ctx->i;
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cpuid = -1;
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if (ctx->error)
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return;
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if (entry->Type != ACPI_MADT_TYPE_GENERIC_INTERRUPT)
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return;
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intr = (ACPI_MADT_GENERIC_INTERRUPT *)entry;
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for (i = 0; i < MAXCPU; i++) {
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pcpu = pcpu_find(i);
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if (pcpu != NULL && pcpu->pc_mpidr == intr->ArmMpidr) {
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cpuid = i;
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break;
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}
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}
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if (cpuid == -1) {
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/* pcpu not found. */
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device_printf(sc->dev, "MADT: could not find pcpu, "
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"ArmMpidr %lx\n", intr->ArmMpidr);
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ctx->error = ENODEV;
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return;
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}
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if (bootverbose)
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device_printf(sc->dev, "MADT: cpu %d (mpidr %lu) irq %d "
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"%s-triggered\n", cpuid, intr->ArmMpidr,
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intr->PerformanceInterrupt,
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(intr->Flags & ACPI_MADT_PERFORMANCE_IRQ_MODE) ?
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"edge" : "level");
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bus_set_resource(sc->dev, SYS_RES_IRQ, ctx->i,
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intr->PerformanceInterrupt, 1);
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sc->irq[ctx->i].res = bus_alloc_resource_any(sc->dev, SYS_RES_IRQ,
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&rid, RF_ACTIVE | RF_SHAREABLE);
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if (sc->irq[ctx->i].res == NULL) {
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device_printf(sc->dev, "Failed to allocate IRQ %d\n", ctx->i);
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ctx->error = ENXIO;
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return;
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}
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/*
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* BUS_CONFIG_INTR does nothing on arm64, so we manually set trigger
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* mode.
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*/
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data = rman_get_virtual(sc->irq[ctx->i].res);
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KASSERT(data->type == INTR_MAP_DATA_ACPI, ("Wrong data type"));
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ad = (struct intr_map_data_acpi *)data;
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ad->trig = (intr->Flags & ACPI_MADT_PERFORMANCE_IRQ_MODE) ?
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INTR_TRIGGER_EDGE : INTR_TRIGGER_LEVEL;
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ad->pol = INTR_POLARITY_HIGH;
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if (!intr_is_per_cpu(sc->irq[ctx->i].res))
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sc->irq[ctx->i].cpuid = cpuid;
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ctx->i++;
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}
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static void
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pmu_acpi_identify(driver_t *driver, device_t parent)
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{
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device_t dev;
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if (acpi_find_table(ACPI_SIG_MADT) == 0)
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return;
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dev = BUS_ADD_CHILD(parent, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST,
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"pmu", -1);
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if (dev == NULL)
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device_printf(parent, "pmu: Unable to add pmu child\n");
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}
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static int
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pmu_acpi_probe(device_t dev)
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{
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device_set_desc(dev, "Performance Monitoring Unit");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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pmu_acpi_attach(device_t dev)
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{
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struct pmu_softc *sc;
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struct madt_ctx ctx;
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ACPI_TABLE_MADT *madt;
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int i;
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sc = device_get_softc(dev);
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sc->dev = dev;
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madt = acpi_map_table(acpi_find_table(ACPI_SIG_MADT), ACPI_SIG_MADT);
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if (madt == NULL) {
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device_printf(dev, "Unable to map the MADT table\n");
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return (ENXIO);
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}
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/* We have to initialize cpuid to -1. */
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for (i = 0; i < MAX_RLEN; i++)
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sc->irq[i].cpuid = -1;
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ctx.sc = sc;
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ctx.i = 0;
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ctx.error = 0;
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acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length,
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madt_handler, &ctx);
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acpi_unmap_table(madt);
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if (ctx.error)
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return (ctx.error);
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return (pmu_attach(dev));
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}
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static device_method_t pmu_acpi_methods[] = {
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DEVMETHOD(device_identify, pmu_acpi_identify),
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DEVMETHOD(device_probe, pmu_acpi_probe),
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DEVMETHOD(device_attach, pmu_acpi_attach),
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DEVMETHOD_END,
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};
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DEFINE_CLASS_0(pmu, pmu_acpi_driver, pmu_acpi_methods,
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sizeof(struct pmu_softc));
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static devclass_t pmu_acpi_devclass;
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DRIVER_MODULE(pmu, acpi, pmu_acpi_driver, pmu_acpi_devclass, 0, 0);
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@ -22,6 +22,7 @@ arm/arm/gic_acpi.c optional acpi
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arm/arm/gic_fdt.c optional fdt
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arm/arm/gic_if.m standard
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arm/arm/pmu.c standard
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arm/arm/pmu_acpi.c optional acpi
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arm/arm/pmu_fdt.c optional fdt
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arm64/acpica/acpi_iort.c optional acpi
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arm64/acpica/acpi_machdep.c optional acpi
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