sys/dev/acpica/acpi_cpu.c

   1 /*-
   2  * Copyright (c) 2003-2005 Nate Lawson (SDG)
   3  * Copyright (c) 2001 Michael Smith
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/dev/acpica/acpi_cpu.c,v 1.72 2008/04/12 12:06:00 rpaulo Exp $
  28  */
  29
  30 #include "opt_acpi.h"
  31
  32 #include <sys/param.h>
  33 #include <sys/bus.h>
  34 #include <sys/kernel.h>
  35 #include <sys/sysctl.h>
  36
  37 #include <machine/globaldata.h>
  38 #include <machine/smp.h>
  39
  40 #include "acpi.h"
  41 #include "acpivar.h"
  42 #include "acpi_cpu.h"
  43 #include "cpu_if.h"
  44
  45 #define ACPI_NOTIFY_PX_STATES   0x80    /* _PPC/_PDL changed. */
  46 #define ACPI_NOTIFY_CX_STATES   0x81    /* _CST changed. */
  47
  48 static int      acpi_cpu_probe(device_t dev);
  49 static int      acpi_cpu_attach(device_t dev);
  50 static struct resource_list *
  51                 acpi_cpu_get_rlist(device_t, device_t);
  52 static struct resource *
  53                 acpi_cpu_alloc_resource(device_t, device_t,
  54                         int, int *, u_long, u_long, u_long, u_int, int);
  55 static int      acpi_cpu_release_resource(device_t, device_t,
  56                         int, int, struct resource *);
  57 static struct ksensordev *
  58                 acpi_cpu_get_sensdev(device_t);
  59
  60 static int      acpi_cpu_get_id(uint32_t, uint32_t *, uint32_t *);
  61 static void     acpi_cpu_notify(ACPI_HANDLE, UINT32, void *);
  62
  63 static device_method_t acpi_cpu_methods[] = {
  64     /* Device interface */
  65     DEVMETHOD(device_probe,             acpi_cpu_probe),
  66     DEVMETHOD(device_attach,            acpi_cpu_attach),
  67     DEVMETHOD(device_detach,            bus_generic_detach),
  68     DEVMETHOD(device_shutdown,          bus_generic_shutdown),
  69     DEVMETHOD(device_suspend,           bus_generic_suspend),
  70     DEVMETHOD(device_resume,            bus_generic_resume),
  71
  72     /* Bus interface */
  73     DEVMETHOD(bus_add_child,            bus_generic_add_child),
  74     DEVMETHOD(bus_print_child,          bus_generic_print_child),
  75     DEVMETHOD(bus_read_ivar,            bus_generic_read_ivar),
  76     DEVMETHOD(bus_write_ivar,           bus_generic_write_ivar),
  77     DEVMETHOD(bus_get_resource_list,    acpi_cpu_get_rlist),
  78     DEVMETHOD(bus_set_resource,         bus_generic_rl_set_resource),
  79     DEVMETHOD(bus_get_resource,         bus_generic_rl_get_resource),
  80     DEVMETHOD(bus_alloc_resource,       acpi_cpu_alloc_resource),
  81     DEVMETHOD(bus_release_resource,     acpi_cpu_release_resource),
  82     DEVMETHOD(bus_driver_added,         bus_generic_driver_added),
  83     DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
  84     DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
  85     DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
  86     DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
  87
  88     /* CPU interface */
  89     DEVMETHOD(cpu_get_sensdev,          acpi_cpu_get_sensdev),
  90
  91     DEVMETHOD_END
  92 };
  93
  94 static driver_t acpi_cpu_driver = {
  95     "cpu",
  96     acpi_cpu_methods,
  97     sizeof(struct acpi_cpu_softc)
  98 };
  99
 100 static devclass_t acpi_cpu_devclass;
 101 DRIVER_MODULE(cpu, acpi, acpi_cpu_driver, acpi_cpu_devclass, NULL, NULL);
 102 MODULE_DEPEND(cpu, acpi, 1, 1, 1);
 103
 104 static int
 105 acpi_cpu_probe(device_t dev)
 106 {
 107     int acpi_id, cpu_id;
 108     ACPI_BUFFER buf;
 109     ACPI_HANDLE handle;
 110     ACPI_STATUS status;
 111     ACPI_OBJECT *obj;
 112
 113     if (acpi_disabled("cpu") || acpi_get_type(dev) != ACPI_TYPE_PROCESSOR)
 114         return ENXIO;
 115
 116     handle = acpi_get_handle(dev);
 117
 118     /*
 119      * Get our Processor object.
 120      */
 121     buf.Pointer = NULL;
 122     buf.Length = ACPI_ALLOCATE_BUFFER;
 123     status = AcpiEvaluateObject(handle, NULL, NULL, &buf);
 124     if (ACPI_FAILURE(status)) {
 125         device_printf(dev, "probe failed to get Processor obj - %s\n",
 126                       AcpiFormatException(status));
 127         return ENXIO;
 128     }
 129
 130     obj = (ACPI_OBJECT *)buf.Pointer;
 131     if (obj->Type != ACPI_TYPE_PROCESSOR) {
 132         device_printf(dev, "Processor object has bad type %d\n", obj->Type);
 133         AcpiOsFree(obj);
 134         return ENXIO;
 135     }
 136
 137     acpi_id = obj->Processor.ProcId;
 138     AcpiOsFree(obj);
 139
 140     /*
 141      * Find the processor associated with our unit.  We could use the
 142      * ProcId as a key, however, some boxes do not have the same values
 143      * in their Processor object as the ProcId values in the MADT.
 144      */
 145     if (acpi_cpu_get_id(device_get_unit(dev), &acpi_id, &cpu_id) != 0)
 146         return ENXIO;
 147
 148     acpi_set_magic(dev, cpu_id);
 149     device_set_desc(dev, "ACPI CPU");
 150
 151     return 0;
 152 }
 153
 154 static int
 155 acpi_cpu_attach(device_t dev)
 156 {
 157     struct acpi_cpu_softc *sc = device_get_softc(dev);
 158     ACPI_HANDLE handle;
 159     device_t child;
 160     int cpu_id, cpu_features;
 161     struct acpi_softc *acpi_sc;
 162
 163     sc->cpu_dev = dev;
 164
 165     handle = acpi_get_handle(dev);
 166     cpu_id = acpi_get_magic(dev);
 167
 168     acpi_sc = acpi_device_get_parent_softc(dev);
 169     if (cpu_id == 0) {
 170         sysctl_ctx_init(&sc->glob_sysctl_ctx);
 171         sc->glob_sysctl_tree = SYSCTL_ADD_NODE(&sc->glob_sysctl_ctx,
 172                                SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
 173                                OID_AUTO, "cpu", CTLFLAG_RD, 0,
 174                                "node for CPU global settings");
 175         if (sc->glob_sysctl_tree == NULL)
 176             return ENOMEM;
 177     }
 178
 179     sysctl_ctx_init(&sc->pcpu_sysctl_ctx);
 180     sc->pcpu_sysctl_tree = SYSCTL_ADD_NODE(&sc->pcpu_sysctl_ctx,
 181                            SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree),
 182                            OID_AUTO, device_get_nameunit(dev), CTLFLAG_RD, 0,
 183                            "node for per-CPU settings");
 184     if (sc->pcpu_sysctl_tree == NULL) {
 185         sysctl_ctx_free(&sc->glob_sysctl_ctx);
 186         return ENOMEM;
 187     }
 188
 189     /*
 190      * Before calling any CPU methods, collect child driver feature hints
 191      * and notify ACPI of them.  We support unified SMP power control
 192      * so advertise this ourselves.  Note this is not the same as independent
 193      * SMP control where each CPU can have different settings.
 194      */
 195     cpu_features = ACPI_PDC_MP_C1PXTX | ACPI_PDC_MP_C2C3;
 196     cpu_features |= acpi_cpu_md_features();
 197
 198     /*
 199      * CPU capabilities are specified as a buffer of 32-bit integers:
 200      * revision, count, and one or more capabilities.
 201      */
 202     if (cpu_features) {
 203         uint32_t cap_set[3];
 204         ACPI_STATUS status;
 205
 206         cap_set[0] = 0;
 207         cap_set[1] = cpu_features;
 208         status = acpi_eval_osc(dev, handle,
 209             "4077A616-290C-47BE-9EBD-D87058713953", 1, cap_set, 2);
 210
 211         if (ACPI_FAILURE(status)) {
 212             ACPI_OBJECT_LIST arglist;
 213             ACPI_OBJECT arg[4];
 214
 215             if (bootverbose)
 216                 device_printf(dev, "_OSC failed, using _PDC\n");
 217
 218             arglist.Pointer = arg;
 219             arglist.Count = 1;
 220             arg[0].Type = ACPI_TYPE_BUFFER;
 221             arg[0].Buffer.Length = sizeof(cap_set);
 222             arg[0].Buffer.Pointer = (uint8_t *)cap_set;
 223             cap_set[0] = 1; /* revision */
 224             cap_set[1] = 1; /* # of capabilities integers */
 225             cap_set[2] = cpu_features;
 226             AcpiEvaluateObject(handle, "_PDC", &arglist, NULL);
 227         }
 228     }
 229
 230     ksnprintf(sc->cpu_sensdev.xname, sizeof(sc->cpu_sensdev.xname), "%s",
 231         device_get_nameunit(dev));
 232     sensordev_install(&sc->cpu_sensdev);
 233
 234     child = BUS_ADD_CHILD(dev, dev, 0, "cpu_cst", -1);
 235     if (child == NULL)
 236         return ENXIO;
 237     acpi_set_handle(child, handle);
 238     acpi_set_magic(child, cpu_id);
 239     sc->cpu_cst = child;
 240
 241     child = BUS_ADD_CHILD(dev, dev, 0, "cpu_pst", -1);
 242     if (child == NULL)
 243         return ENXIO;
 244     acpi_set_handle(child, handle);
 245     acpi_set_magic(child, cpu_id);
 246     sc->cpu_pst = child;
 247
 248     bus_generic_probe(dev);
 249     bus_generic_attach(dev);
 250
 251     AcpiInstallNotifyHandler(handle, ACPI_DEVICE_NOTIFY, acpi_cpu_notify, sc);
 252
 253     return 0;
 254 }
 255
 256 /*
 257  * All resources are assigned directly to us by acpi,
 258  * so 'child' is bypassed here.
 259  */
 260 static struct resource_list *
 261 acpi_cpu_get_rlist(device_t dev, device_t child __unused)
 262 {
 263     return BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev);
 264 }
 265
 266 static struct resource *
 267 acpi_cpu_alloc_resource(device_t dev, device_t child __unused,
 268                         int type, int *rid, u_long start, u_long end,
 269                         u_long count, u_int flags, int cpuid)
 270 {
 271     return BUS_ALLOC_RESOURCE(device_get_parent(dev), dev, type, rid,
 272                               start, end, count, flags, cpuid);
 273 }
 274
 275 static int
 276 acpi_cpu_release_resource(device_t dev, device_t child __unused,
 277                           int type, int rid, struct resource *r)
 278 {
 279     return BUS_RELEASE_RESOURCE(device_get_parent(dev), dev, type, rid, r);
 280 }
 281
 282 /*
 283  * Find the nth present CPU and return its pc_cpuid as well as set the
 284  * pc_acpi_id from the most reliable source.
 285  */
 286 static int
 287 acpi_cpu_get_id(uint32_t idx, uint32_t *acpi_id, uint32_t *cpu_id)
 288 {
 289     struct mdglobaldata *md;
 290     uint32_t i;
 291
 292     KASSERT(acpi_id != NULL, ("Null acpi_id"));
 293     KASSERT(cpu_id != NULL, ("Null cpu_id"));
 294     for (i = 0; i < ncpus; i++) {
 295         if (CPUMASK_TESTBIT(smp_active_mask, i) == 0)
 296             continue;
 297         md = (struct mdglobaldata *)globaldata_find(i);
 298         KASSERT(md != NULL, ("no pcpu data for %d", i));
 299         if (idx-- == 0) {
 300             /*
 301              * If gd_acpi_id was not initialized (e.g., box w/o MADT)
 302              * override it with the value from the ASL.  Otherwise, if the
 303              * two don't match, prefer the MADT-derived value.  Finally,
 304              * return the gd_cpuid to reference this processor.
 305              */
 306             if (md->gd_acpi_id == 0xffffffff) {
 307                 kprintf("cpu%d: acpi id was not set, set it to %u\n",
 308                     i, *acpi_id);
 309                 md->gd_acpi_id = *acpi_id;
 310             } else if (md->gd_acpi_id != *acpi_id) {
 311                 kprintf("cpu%d: acpi id mismatch, madt %u, "
 312                     "processor object %u\n",
 313                     i, md->gd_acpi_id, *acpi_id);
 314                 *acpi_id = md->gd_acpi_id;
 315             }
 316             *cpu_id = md->mi.gd_cpuid;
 317             return 0;
 318         }
 319     }
 320     return ESRCH;
 321 }
 322
 323 static void
 324 acpi_cpu_notify(ACPI_HANDLE handler __unused, UINT32 notify, void *xsc)
 325 {
 326     struct acpi_cpu_softc *sc = xsc;
 327
 328     switch (notify) {
 329     case ACPI_NOTIFY_CX_STATES:
 330         if (sc->cpu_cst_notify != NULL)
 331             sc->cpu_cst_notify(sc->cpu_cst);
 332         break;
 333     case ACPI_NOTIFY_PX_STATES:
 334         if (sc->cpu_pst_notify != NULL)
 335             sc->cpu_pst_notify(sc->cpu_pst);
 336         break;
 337     default:
 338         device_printf(sc->cpu_dev, "unknown notify: %#x\n", notify);
 339         break;
 340     }
 341 }
 342
 343 static struct ksensordev *
 344 acpi_cpu_get_sensdev(device_t dev)
 345 {
 346     struct acpi_cpu_softc *sc = device_get_softc(dev);
 347
 348     return &sc->cpu_sensdev;
 349 }