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
madt_handler(ACPI_SUBTABLE_HEADER * entry,void * arg)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
pmu_acpi_identify(driver_t * driver,device_t parent)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
pmu_acpi_probe(device_t dev)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
pmu_acpi_attach(device_t dev)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