1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2020 Val Packett <val@packett.cool> 5 * Copyright (c) 2021 Ruslan Bukin <br@bsdpad.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 #include <sys/rman.h> 34 35 #include <contrib/dev/acpica/include/acpi.h> 36 #include <dev/acpica/acpivar.h> 37 38 #include "acpi_bus_if.h" 39 #include "pmu.h" 40 41 struct madt_ctx { 42 struct pmu_softc *sc; 43 int error; 44 int i; 45 }; 46 47 static void 48 madt_handler(ACPI_SUBTABLE_HEADER *entry, void *arg) 49 { 50 ACPI_MADT_GENERIC_INTERRUPT *intr; 51 struct intr_map_data_acpi *ad; 52 struct intr_map_data *data; 53 struct madt_ctx *ctx; 54 struct pmu_softc *sc; 55 struct pcpu *pcpu; 56 int rid; 57 int cpuid; 58 int i; 59 60 ctx = arg; 61 sc = ctx->sc; 62 rid = ctx->i; 63 cpuid = -1; 64 65 if (ctx->error) 66 return; 67 68 if (entry->Type != ACPI_MADT_TYPE_GENERIC_INTERRUPT) 69 return; 70 intr = (ACPI_MADT_GENERIC_INTERRUPT *)entry; 71 72 for (i = 0; i < MAXCPU; i++) { 73 pcpu = pcpu_find(i); 74 if (pcpu != NULL && PCPU_GET_MPIDR(pcpu) == intr->ArmMpidr) { 75 cpuid = i; 76 break; 77 } 78 } 79 80 if (cpuid == -1) { 81 /* pcpu not found. */ 82 device_printf(sc->dev, "MADT: could not find pcpu, " 83 "ArmMpidr %lx\n", intr->ArmMpidr); 84 return; 85 } 86 87 if (bootverbose) 88 device_printf(sc->dev, "MADT: cpu %d (mpidr %lu) irq %d " 89 "%s-triggered\n", cpuid, intr->ArmMpidr, 90 intr->PerformanceInterrupt, 91 (intr->Flags & ACPI_MADT_PERFORMANCE_IRQ_MODE) ? 92 "edge" : "level"); 93 94 bus_set_resource(sc->dev, SYS_RES_IRQ, ctx->i, 95 intr->PerformanceInterrupt, 1); 96 97 sc->irq[ctx->i].res = bus_alloc_resource_any(sc->dev, SYS_RES_IRQ, 98 &rid, RF_ACTIVE | RF_SHAREABLE); 99 if (sc->irq[ctx->i].res == NULL) { 100 device_printf(sc->dev, "Failed to allocate IRQ %d\n", ctx->i); 101 ctx->error = ENXIO; 102 return; 103 } 104 105 /* 106 * BUS_CONFIG_INTR does nothing on arm64, so we manually set trigger 107 * mode. 108 */ 109 data = rman_get_virtual(sc->irq[ctx->i].res); 110 KASSERT(data->type == INTR_MAP_DATA_ACPI, ("Wrong data type")); 111 ad = (struct intr_map_data_acpi *)data; 112 ad->trig = (intr->Flags & ACPI_MADT_PERFORMANCE_IRQ_MODE) ? 113 INTR_TRIGGER_EDGE : INTR_TRIGGER_LEVEL; 114 ad->pol = INTR_POLARITY_HIGH; 115 116 if (!intr_is_per_cpu(sc->irq[ctx->i].res)) 117 sc->irq[ctx->i].cpuid = cpuid; 118 119 ctx->i++; 120 } 121 122 static void 123 pmu_acpi_identify(driver_t *driver, device_t parent) 124 { 125 device_t dev; 126 127 if (acpi_find_table(ACPI_SIG_MADT) == 0) 128 return; 129 130 dev = BUS_ADD_CHILD(parent, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST, 131 "pmu", -1); 132 133 if (dev == NULL) 134 device_printf(parent, "pmu: Unable to add pmu child\n"); 135 } 136 137 static int 138 pmu_acpi_probe(device_t dev) 139 { 140 141 device_set_desc(dev, "Performance Monitoring Unit"); 142 143 return (BUS_PROBE_NOWILDCARD); 144 } 145 146 static int 147 pmu_acpi_attach(device_t dev) 148 { 149 struct pmu_softc *sc; 150 struct madt_ctx ctx; 151 ACPI_TABLE_MADT *madt; 152 int i; 153 154 sc = device_get_softc(dev); 155 sc->dev = dev; 156 157 madt = acpi_map_table(acpi_find_table(ACPI_SIG_MADT), ACPI_SIG_MADT); 158 if (madt == NULL) { 159 device_printf(dev, "Unable to map the MADT table\n"); 160 return (ENXIO); 161 } 162 163 /* We have to initialize cpuid to -1. */ 164 for (i = 0; i < MAX_RLEN; i++) 165 sc->irq[i].cpuid = -1; 166 167 ctx.sc = sc; 168 ctx.i = 0; 169 ctx.error = 0; 170 acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length, 171 madt_handler, &ctx); 172 173 acpi_unmap_table(madt); 174 175 if (ctx.error) 176 return (ctx.error); 177 178 return (pmu_attach(dev)); 179 } 180 181 static device_method_t pmu_acpi_methods[] = { 182 DEVMETHOD(device_identify, pmu_acpi_identify), 183 DEVMETHOD(device_probe, pmu_acpi_probe), 184 DEVMETHOD(device_attach, pmu_acpi_attach), 185 DEVMETHOD_END, 186 }; 187 188 DEFINE_CLASS_0(pmu, pmu_acpi_driver, pmu_acpi_methods, 189 sizeof(struct pmu_softc)); 190 191 DRIVER_MODULE(pmu, acpi, pmu_acpi_driver, 0, 0); 192