sys/dev/acpica/acpi_cpu_pstate.c

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Sepherosa Ziehau <sepherosa@gmail.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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "opt_acpi.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/bus.h>
  39 #include <sys/kernel.h>
  40 #include <sys/malloc.h>
  41 #include <sys/queue.h>
  42 #include <sys/rman.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/msgport2.h>
  45 #include <sys/cpu_topology.h>
  46
  47 #include <net/netisr2.h>
  48 #include <net/netmsg2.h>
  49 #include <net/if_var.h>
  50
  51 #include "acpi.h"
  52 #include "acpivar.h"
  53 #include "acpi_cpu.h"
  54 #include "acpi_cpu_pstate.h"
  55
  56 #define ACPI_NPSTATE_MAX        16
  57
  58 #define ACPI_PSS_PX_NENTRY      6
  59
  60 #define ACPI_PSD_COORD_SWALL    0xfc
  61 #define ACPI_PSD_COORD_SWANY    0xfd
  62 #define ACPI_PSD_COORD_HWALL    0xfe
  63 #define ACPI_PSD_COORD_VALID(coord) \
  64         ((coord) == ACPI_PSD_COORD_SWALL || \
  65          (coord) == ACPI_PSD_COORD_SWANY || \
  66          (coord) == ACPI_PSD_COORD_HWALL)
  67
  68 struct acpi_pst_softc;
  69 LIST_HEAD(acpi_pst_list, acpi_pst_softc);
  70
  71 struct netmsg_acpi_pst {
  72         struct netmsg_base base;
  73         const struct acpi_pst_res *ctrl;
  74         const struct acpi_pst_res *status;
  75 };
  76
  77 struct acpi_pst_domain {
  78         uint32_t                pd_dom;
  79         uint32_t                pd_coord;
  80         uint32_t                pd_nproc;
  81         LIST_ENTRY(acpi_pst_domain) pd_link;
  82
  83         uint32_t                pd_flags;
  84
  85         int                     pd_state;
  86         int                     pd_sstart;
  87         struct acpi_pst_list    pd_pstlist;
  88
  89         struct sysctl_ctx_list  pd_sysctl_ctx;
  90         struct sysctl_oid       *pd_sysctl_tree;
  91 };
  92 LIST_HEAD(acpi_pst_domlist, acpi_pst_domain);
  93
  94 #define ACPI_PSTDOM_FLAG_STUB   0x1     /* stub domain, no _PSD */
  95 #define ACPI_PSTDOM_FLAG_DEAD   0x2     /* domain can't be started */
  96 #define ACPI_PSTDOM_FLAG_INT    0x4     /* domain created from Integer _PSD */
  97
  98 struct acpi_pst_softc {
  99         device_t                pst_dev;
 100         struct acpi_cpu_softc   *pst_parent;
 101         struct acpi_pst_domain  *pst_domain;
 102         struct acpi_pst_res     pst_creg;
 103         struct acpi_pst_res     pst_sreg;
 104
 105         int                     pst_state;
 106         int                     pst_sstart;
 107         int                     pst_cpuid;
 108
 109         ACPI_HANDLE             pst_handle;
 110
 111         LIST_ENTRY(acpi_pst_softc) pst_link;
 112 };
 113
 114 static int      acpi_pst_probe(device_t dev);
 115 static int      acpi_pst_attach(device_t dev);
 116
 117 static void     acpi_pst_postattach(void *);
 118 static struct acpi_pst_domain *
 119                 acpi_pst_domain_create_int(device_t, uint32_t);
 120 static struct acpi_pst_domain *
 121                 acpi_pst_domain_create_pkg(device_t, ACPI_OBJECT *);
 122 static struct acpi_pst_domain *
 123                 acpi_pst_domain_find(uint32_t);
 124 static struct acpi_pst_domain *
 125                 acpi_pst_domain_alloc(uint32_t, uint32_t, uint32_t);
 126 static int      acpi_pst_domain_set_pstate(struct acpi_pst_domain *, int);
 127 static void     acpi_pst_domain_check_nproc(device_t, struct acpi_pst_domain *);
 128 static int      acpi_pst_global_set_pstate(int);
 129
 130 static int      acpi_pst_check_csr(struct acpi_pst_softc *);
 131 static int      acpi_pst_check_pstates(struct acpi_pst_softc *);
 132 static int      acpi_pst_init(struct acpi_pst_softc *);
 133 static int      acpi_pst_set_pstate(struct acpi_pst_softc *,
 134                     const struct acpi_pstate *);
 135 static const struct acpi_pstate *
 136                 acpi_pst_get_pstate(struct acpi_pst_softc *);
 137 static int      acpi_pst_alloc_resource(device_t, ACPI_OBJECT *, int,
 138                     struct acpi_pst_res *);
 139
 140 static void     acpi_pst_check_csr_handler(netmsg_t);
 141 static void     acpi_pst_check_pstates_handler(netmsg_t);
 142 static void     acpi_pst_init_handler(netmsg_t);
 143 static void     acpi_pst_set_pstate_handler(netmsg_t);
 144 static void     acpi_pst_get_pstate_handler(netmsg_t);
 145
 146 static int      acpi_pst_sysctl_freqs(SYSCTL_HANDLER_ARGS);
 147 static int      acpi_pst_sysctl_members(SYSCTL_HANDLER_ARGS);
 148 static int      acpi_pst_sysctl_select(SYSCTL_HANDLER_ARGS);
 149 static int      acpi_pst_sysctl_global(SYSCTL_HANDLER_ARGS);
 150
 151 static struct acpi_pst_domlist  acpi_pst_domains =
 152         LIST_HEAD_INITIALIZER(acpi_pst_domains);
 153 static int                      acpi_pst_domain_id;
 154
 155 static int                      acpi_pst_global_state;
 156
 157 static int                      acpi_npstates;
 158 static struct acpi_pstate       *acpi_pstates;
 159
 160 static const struct acpi_pst_md *acpi_pst_md;
 161
 162 static int                      acpi_pst_ht_reuse_domain = 1;
 163 TUNABLE_INT("hw.acpi.cpu.pst.ht_reuse_domain", &acpi_pst_ht_reuse_domain);
 164
 165 static int                      acpi_pst_force_pkg_domain = 0;
 166 TUNABLE_INT("hw.acpi.cpu.pst.force_pkg_domain", &acpi_pst_force_pkg_domain);
 167
 168 static device_method_t acpi_pst_methods[] = {
 169         /* Device interface */
 170         DEVMETHOD(device_probe,                 acpi_pst_probe),
 171         DEVMETHOD(device_attach,                acpi_pst_attach),
 172         DEVMETHOD(device_detach,                bus_generic_detach),
 173         DEVMETHOD(device_shutdown,              bus_generic_shutdown),
 174         DEVMETHOD(device_suspend,               bus_generic_suspend),
 175         DEVMETHOD(device_resume,                bus_generic_resume),
 176
 177         /* Bus interface */
 178         DEVMETHOD(bus_add_child,                bus_generic_add_child),
 179         DEVMETHOD(bus_print_child,              bus_generic_print_child),
 180         DEVMETHOD(bus_read_ivar,                bus_generic_read_ivar),
 181         DEVMETHOD(bus_write_ivar,               bus_generic_write_ivar),
 182         DEVMETHOD(bus_get_resource_list,        bus_generic_get_resource_list),
 183         DEVMETHOD(bus_set_resource,             bus_generic_rl_set_resource),
 184         DEVMETHOD(bus_get_resource,             bus_generic_rl_get_resource),
 185         DEVMETHOD(bus_alloc_resource,           bus_generic_alloc_resource),
 186         DEVMETHOD(bus_release_resource,         bus_generic_release_resource),
 187         DEVMETHOD(bus_driver_added,             bus_generic_driver_added),
 188         DEVMETHOD(bus_activate_resource,        bus_generic_activate_resource),
 189         DEVMETHOD(bus_deactivate_resource,      bus_generic_deactivate_resource),
 190         DEVMETHOD(bus_setup_intr,               bus_generic_setup_intr),
 191         DEVMETHOD(bus_teardown_intr,            bus_generic_teardown_intr),
 192
 193         DEVMETHOD_END
 194 };
 195
 196 static driver_t acpi_pst_driver = {
 197         "cpu_pst",
 198         acpi_pst_methods,
 199         sizeof(struct acpi_pst_softc)
 200 };
 201
 202 static devclass_t acpi_pst_devclass;
 203 DRIVER_MODULE(cpu_pst, cpu, acpi_pst_driver, acpi_pst_devclass, NULL, NULL);
 204 MODULE_DEPEND(cpu_pst, acpi, 1, 1, 1);
 205
 206 static __inline int
 207 acpi_pst_freq2index(int freq)
 208 {
 209         int i;
 210
 211         for (i = 0; i < acpi_npstates; ++i) {
 212                 if (acpi_pstates[i].st_freq == freq)
 213                         return i;
 214         }
 215         return -1;
 216 }
 217
 218 static int
 219 acpi_pst_probe(device_t dev)
 220 {
 221         ACPI_BUFFER buf;
 222         ACPI_HANDLE handle;
 223         ACPI_STATUS status;
 224         ACPI_OBJECT *obj;
 225
 226         if (acpi_disabled("cpu_pst") ||
 227             acpi_get_type(dev) != ACPI_TYPE_PROCESSOR)
 228                 return ENXIO;
 229
 230         if (acpi_pst_md == NULL)
 231                 acpi_pst_md = acpi_pst_md_probe();
 232
 233         handle = acpi_get_handle(dev);
 234
 235         /*
 236          * Check _PSD package
 237          *
 238          * NOTE:
 239          * Some BIOSes do not expose _PCT for the second thread of
 240          * CPU cores.  In this case, _PSD should be enough to get the
 241          * P-state of the second thread working, since it must have
 242          * the same _PCT and _PSS as the first thread in the same
 243          * core.
 244          */
 245         buf.Pointer = NULL;
 246         buf.Length = ACPI_ALLOCATE_BUFFER;
 247         status = AcpiEvaluateObject(handle, "_PSD", NULL, &buf);
 248         if (!ACPI_FAILURE(status)) {
 249                 AcpiOsFree((ACPI_OBJECT *)buf.Pointer);
 250                 goto done;
 251         }
 252
 253         /*
 254          * Check _PCT package
 255          */
 256         buf.Pointer = NULL;
 257         buf.Length = ACPI_ALLOCATE_BUFFER;
 258         status = AcpiEvaluateObject(handle, "_PCT", NULL, &buf);
 259         if (ACPI_FAILURE(status)) {
 260                 if (bootverbose) {
 261                         device_printf(dev, "Can't get _PCT package - %s\n",
 262                                       AcpiFormatException(status));
 263                 }
 264                 return ENXIO;
 265         }
 266
 267         obj = (ACPI_OBJECT *)buf.Pointer;
 268         if (!ACPI_PKG_VALID_EQ(obj, 2)) {
 269                 device_printf(dev, "Invalid _PCT package\n");
 270                 AcpiOsFree(obj);
 271                 return ENXIO;
 272         }
 273         AcpiOsFree(obj);
 274
 275         /*
 276          * Check _PSS package
 277          */
 278         buf.Pointer = NULL;
 279         buf.Length = ACPI_ALLOCATE_BUFFER;
 280         status = AcpiEvaluateObject(handle, "_PSS", NULL, &buf);
 281         if (ACPI_FAILURE(status)) {
 282                 device_printf(dev, "Can't get _PSS package - %s\n",
 283                               AcpiFormatException(status));
 284                 return ENXIO;
 285         }
 286
 287         obj = (ACPI_OBJECT *)buf.Pointer;
 288         if (!ACPI_PKG_VALID(obj, 1)) {
 289                 device_printf(dev, "Invalid _PSS package\n");
 290                 AcpiOsFree(obj);
 291                 return ENXIO;
 292         }
 293         AcpiOsFree(obj);
 294
 295 done:
 296         device_set_desc(dev, "ACPI CPU P-State");
 297         return 0;
 298 }
 299
 300 static int
 301 acpi_pst_attach(device_t dev)
 302 {
 303         struct acpi_pst_softc *sc = device_get_softc(dev);
 304         struct acpi_pst_domain *dom = NULL;
 305         ACPI_BUFFER buf;
 306         ACPI_STATUS status;
 307         ACPI_OBJECT *obj;
 308         struct acpi_pstate *pstate, *p;
 309         int i, npstate, error;
 310
 311         sc->pst_dev = dev;
 312         sc->pst_parent = device_get_softc(device_get_parent(dev));
 313         sc->pst_handle = acpi_get_handle(dev);
 314         sc->pst_cpuid = acpi_get_magic(dev);
 315
 316         /*
 317          * If there is a _PSD, then we create procossor domain
 318          * accordingly.  If there is no _PSD, we just fake a
 319          * default processor domain0.
 320          */
 321         buf.Pointer = NULL;
 322         buf.Length = ACPI_ALLOCATE_BUFFER;
 323         status = AcpiEvaluateObject(sc->pst_handle, "_PSD", NULL, &buf);
 324         if (!ACPI_FAILURE(status)) {
 325                 obj = (ACPI_OBJECT *)buf.Pointer;
 326
 327                 if (acpi_pst_domain_id > 0) {
 328                         device_printf(dev, "Missing _PSD for certain CPUs\n");
 329                         AcpiOsFree(obj);
 330                         return ENXIO;
 331                 }
 332                 acpi_pst_domain_id = -1;
 333
 334                 if (ACPI_PKG_VALID_EQ(obj, 1)) {
 335                         dom = acpi_pst_domain_create_pkg(dev,
 336                                 &obj->Package.Elements[0]);
 337                         if (dom == NULL) {
 338                                 AcpiOsFree(obj);
 339                                 return ENXIO;
 340                         }
 341                 } else {
 342                         if (obj->Type != ACPI_TYPE_INTEGER) {
 343                                 device_printf(dev,
 344                                     "Invalid _PSD package, Type 0x%x\n",
 345                                     obj->Type);
 346                                 AcpiOsFree(obj);
 347                                 return ENXIO;
 348                         } else {
 349                                 device_printf(dev, "Integer _PSD %ju\n",
 350                                     (uintmax_t)obj->Integer.Value);
 351                                 dom = acpi_pst_domain_create_int(dev,
 352                                     obj->Integer.Value);
 353                                 if (dom == NULL) {
 354                                         AcpiOsFree(obj);
 355                                         return ENXIO;
 356                                 }
 357                         }
 358                 }
 359
 360                 /* Free _PSD */
 361                 AcpiOsFree(buf.Pointer);
 362         } else {
 363                 if (acpi_pst_domain_id < 0) {
 364                         device_printf(dev, "Missing _PSD for cpu%d\n",
 365                             sc->pst_cpuid);
 366                         return ENXIO;
 367                 }
 368
 369                 /*
 370                  * Create a stub one processor domain for each processor
 371                  */
 372                 dom = acpi_pst_domain_alloc(acpi_pst_domain_id,
 373                         ACPI_PSD_COORD_SWANY, 1);
 374                 dom->pd_flags |= ACPI_PSTDOM_FLAG_STUB;
 375
 376                 ++acpi_pst_domain_id;
 377         }
 378
 379         /* Make sure that adding us will not overflow our domain */
 380         acpi_pst_domain_check_nproc(dev, dom);
 381
 382         /*
 383          * Get control/status registers from _PCT
 384          */
 385         buf.Pointer = NULL;
 386         buf.Length = ACPI_ALLOCATE_BUFFER;
 387         status = AcpiEvaluateObject(sc->pst_handle, "_PCT", NULL, &buf);
 388         if (ACPI_FAILURE(status)) {
 389                 struct acpi_pst_softc *pst;
 390
 391                 /*
 392                  * No _PCT.  See the comment in acpi_pst_probe() near
 393                  * _PSD check.
 394                  *
 395                  * Use control/status registers of another CPU in the
 396                  * same domain, or in the same core, if the type of
 397                  * these registers are "Fixed Hardware", e.g. on most
 398                  * of the model Intel CPUs.
 399                  */
 400                 pst = LIST_FIRST(&dom->pd_pstlist);
 401                 if (pst == NULL) {
 402                         cpumask_t mask;
 403
 404                         mask = get_cpumask_from_level(sc->pst_cpuid,
 405                             CORE_LEVEL);
 406                         if (CPUMASK_TESTNZERO(mask)) {
 407                                 struct acpi_pst_domain *dom1;
 408
 409                                 LIST_FOREACH(dom1, &acpi_pst_domains, pd_link) {
 410                                         LIST_FOREACH(pst, &dom1->pd_pstlist,
 411                                             pst_link) {
 412                                                 if (CPUMASK_TESTBIT(mask,
 413                                                     pst->pst_cpuid))
 414                                                         break;
 415                                         }
 416                                         if (pst != NULL)
 417                                                 break;
 418                                 }
 419                                 if (pst != NULL && acpi_pst_ht_reuse_domain) {
 420                                         /*
 421                                          * Use the same domain for CPUs in the
 422                                          * same core.
 423                                          */
 424                                         device_printf(dev, "Destroy domain%u, "
 425                                             "reuse domain%u\n",
 426                                             dom->pd_dom, dom1->pd_dom);
 427                                         LIST_REMOVE(dom, pd_link);
 428                                         kfree(dom, M_DEVBUF);
 429                                         dom = dom1;
 430                                         /*
 431                                          * Make sure that adding us will not
 432                                          * overflow the domain containing
 433                                          * siblings in the same core.
 434                                          */
 435                                         acpi_pst_domain_check_nproc(dev, dom);
 436                                 }
 437                         }
 438                 }
 439                 if (pst != NULL &&
 440                     pst->pst_creg.pr_res == NULL &&
 441                     pst->pst_creg.pr_rid == 0 &&
 442                     pst->pst_creg.pr_gas.SpaceId ==
 443                     ACPI_ADR_SPACE_FIXED_HARDWARE &&
 444                     pst->pst_sreg.pr_res == NULL &&
 445                     pst->pst_sreg.pr_rid == 0 &&
 446                     pst->pst_sreg.pr_gas.SpaceId ==
 447                     ACPI_ADR_SPACE_FIXED_HARDWARE) {
 448                         sc->pst_creg = pst->pst_creg;
 449                         sc->pst_sreg = pst->pst_sreg;
 450                         device_printf(dev,
 451                             "No _PCT; reuse %s control/status regs\n",
 452                             device_get_nameunit(pst->pst_dev));
 453                         goto fetch_pss;
 454                 }
 455                 device_printf(dev, "Can't get _PCT package - %s\n",
 456                               AcpiFormatException(status));
 457                 return ENXIO;
 458         }
 459
 460         obj = (ACPI_OBJECT *)buf.Pointer;
 461         if (!ACPI_PKG_VALID_EQ(obj, 2)) {
 462                 device_printf(dev, "Invalid _PCT package\n");
 463                 AcpiOsFree(obj);
 464                 return ENXIO;
 465         }
 466
 467         /* Save and try allocating control register */
 468         error = acpi_pst_alloc_resource(dev, obj, 0, &sc->pst_creg);
 469         if (error) {
 470                 AcpiOsFree(obj);
 471                 return error;
 472         }
 473         if (bootverbose) {
 474                 device_printf(dev, "control reg %d %jx\n",
 475                               sc->pst_creg.pr_gas.SpaceId,
 476                               (uintmax_t)sc->pst_creg.pr_gas.Address);
 477         }
 478
 479         /* Save and try allocating status register */
 480         error = acpi_pst_alloc_resource(dev, obj, 1, &sc->pst_sreg);
 481         if (error) {
 482                 AcpiOsFree(obj);
 483                 return error;
 484         }
 485         if (bootverbose) {
 486                 device_printf(dev, "status reg %d %jx\n",
 487                               sc->pst_sreg.pr_gas.SpaceId,
 488                               (uintmax_t)sc->pst_sreg.pr_gas.Address);
 489         }
 490
 491         /* Free _PCT */
 492         AcpiOsFree(obj);
 493
 494 fetch_pss:
 495         /*
 496          * Create P-State table according to _PSS
 497          */
 498         buf.Pointer = NULL;
 499         buf.Length = ACPI_ALLOCATE_BUFFER;
 500         status = AcpiEvaluateObject(sc->pst_handle, "_PSS", NULL, &buf);
 501         if (ACPI_FAILURE(status)) {
 502                 /*
 503                  * No _PSS.  See the comment in acpi_pst_probe() near
 504                  * _PSD check.
 505                  *
 506                  * Assume _PSS are same across all CPUs; well, they
 507                  * should/have to be so.
 508                  */
 509                 if (acpi_npstates > 0 && acpi_pstates != NULL) {
 510                         device_printf(dev, "No _PSS\n");
 511                         goto fetch_ppc;
 512                 }
 513                 device_printf(dev, "Can't get _PSS package - %s\n",
 514                               AcpiFormatException(status));
 515                 return ENXIO;
 516         }
 517
 518         obj = (ACPI_OBJECT *)buf.Pointer;
 519         if (!ACPI_PKG_VALID(obj, 1)) {
 520                 device_printf(dev, "Invalid _PSS package\n");
 521                 AcpiOsFree(obj);
 522                 return ENXIO;
 523         }
 524
 525         /* Don't create too many P-States */
 526         npstate = obj->Package.Count;
 527         if (npstate > ACPI_NPSTATE_MAX) {
 528                 device_printf(dev, "Too many P-States, %d->%d\n",
 529                               npstate, ACPI_NPSTATE_MAX);
 530                 npstate = ACPI_NPSTATE_MAX;
 531         }
 532
 533         /*
 534          * If we have already created P-State table,
 535          * we must make sure that number of entries
 536          * is consistent.
 537          */
 538         if (acpi_pstates != NULL && acpi_npstates != npstate) {
 539                 device_printf(dev, "Inconsistent # of P-States "
 540                               "cross Processor objects\n");
 541                 AcpiOsFree(obj);
 542                 return ENXIO;
 543         }
 544
 545         /*
 546          * Create a temporary P-State table
 547          */
 548         pstate = kmalloc(sizeof(*pstate) * npstate, M_TEMP, M_WAITOK);
 549         for (i = 0, p = pstate; i < npstate; ++i, ++p) {
 550                 ACPI_OBJECT *pkg;
 551                 uint32_t *ptr[ACPI_PSS_PX_NENTRY] = {
 552                         &p->st_freq, &p->st_power, &p->st_xsit_lat,
 553                         &p->st_bm_lat, &p->st_cval, &p->st_sval
 554                 };
 555                 int j;
 556
 557                 pkg = &obj->Package.Elements[i];
 558                 if (!ACPI_PKG_VALID(pkg, ACPI_PSS_PX_NENTRY)) {
 559                         device_printf(dev, "Invalud _PSS P%d\n", i);
 560                         AcpiOsFree(obj);
 561                         kfree(pstate, M_TEMP);
 562                         return ENXIO;
 563                 }
 564                 for (j = 0; j < ACPI_PSS_PX_NENTRY; ++j) {
 565                         if (acpi_PkgInt32(pkg, j, ptr[j]) != 0) {
 566                                 device_printf(dev, "Can't extract "
 567                                               "_PSS P%d %dth entry\n", i, j);
 568                                 AcpiOsFree(obj);
 569                                 kfree(pstate, M_TEMP);
 570                                 return ENXIO;
 571                         }
 572                 }
 573         }
 574
 575         /* Free _PSS */
 576         AcpiOsFree(obj);
 577
 578         if (acpi_pstates == NULL) {
 579                 /*
 580                  * If no P-State table is created yet,
 581                  * save the temporary one we just created.
 582                  */
 583                 acpi_pstates = pstate;
 584                 acpi_npstates = npstate;
 585                 pstate = NULL;
 586
 587                 if (bootverbose) {
 588                         for (i = 0; i < acpi_npstates; ++i) {
 589                                 device_printf(dev,
 590                                 "freq %u, pwr %u, xlat %u, blat %u, "
 591                                 "cv %08x, sv %08x\n",
 592                                 acpi_pstates[i].st_freq,
 593                                 acpi_pstates[i].st_power,
 594                                 acpi_pstates[i].st_xsit_lat,
 595                                 acpi_pstates[i].st_bm_lat,
 596                                 acpi_pstates[i].st_cval,
 597                                 acpi_pstates[i].st_sval);
 598                         }
 599                 }
 600         } else {
 601                 /*
 602                  * Make sure that P-State tables are same
 603                  * for all processors.
 604                  */
 605                 if (memcmp(pstate, acpi_pstates,
 606                            sizeof(*pstate) * npstate) != 0) {
 607                         device_printf(dev, "Inconsistent _PSS "
 608                                       "cross Processor objects\n");
 609 #if 0
 610                         /*
 611                          * Some BIOSes create different P-State tables;
 612                          * just trust the one from the BSP and move on.
 613                          */
 614                         kfree(pstate, M_TEMP);
 615                         return ENXIO;
 616 #endif
 617                 }
 618                 kfree(pstate, M_TEMP);
 619         }
 620
 621 fetch_ppc:
 622         /* By default, we start from P-State table's first entry */
 623         sc->pst_sstart = 0;
 624
 625         /*
 626          * Adjust the usable first entry of P-State table,
 627          * if there is _PPC object.
 628          */
 629         buf.Pointer = NULL;
 630         buf.Length = ACPI_ALLOCATE_BUFFER;
 631         status = AcpiEvaluateObject(sc->pst_handle, "_PPC", NULL, &buf);
 632         if (!ACPI_FAILURE(status)) {
 633                 obj = (ACPI_OBJECT *)buf.Pointer;
 634                 if (obj->Type == ACPI_TYPE_INTEGER) {
 635                         if (obj->Integer.Value >= acpi_npstates) {
 636                                 device_printf(dev, "Invalid _PPC value\n");
 637                                 AcpiOsFree(obj);
 638                                 return ENXIO;
 639                         }
 640                         sc->pst_sstart = obj->Integer.Value;
 641                         if (bootverbose)
 642                                 device_printf(dev, "_PPC %d\n", sc->pst_sstart);
 643
 644                         /* TODO: Install notifiy handler */
 645                 } else {
 646                         device_printf(dev, "Invalid _PPC object\n");
 647                         AcpiOsFree(obj);
 648                         return ENXIO;
 649                 }
 650
 651                 /* Free _PPC */
 652                 AcpiOsFree(obj);
 653         }
 654
 655         sc->pst_state = sc->pst_sstart;
 656
 657         /*
 658          * Some CPUs only have package P-states, but some BIOSes put each
 659          * hyperthread to its own P-state domain; allow user to override.
 660          */
 661         if (LIST_EMPTY(&dom->pd_pstlist) && acpi_pst_force_pkg_domain) {
 662                 cpumask_t mask;
 663
 664                 mask = get_cpumask_from_level(sc->pst_cpuid, CHIP_LEVEL);
 665                 if (CPUMASK_TESTNZERO(mask)) {
 666                         struct acpi_pst_softc *pst = NULL;
 667                         struct acpi_pst_domain *dom1;
 668
 669                         LIST_FOREACH(dom1, &acpi_pst_domains, pd_link) {
 670                                 LIST_FOREACH(pst, &dom1->pd_pstlist,
 671                                     pst_link) {
 672                                         if (CPUMASK_TESTBIT(mask,
 673                                             pst->pst_cpuid))
 674                                                 break;
 675                                 }
 676                                 if (pst != NULL)
 677                                         break;
 678                         }
 679                         if (pst != NULL &&
 680                             memcmp(&pst->pst_creg, &sc->pst_creg,
 681                                 sizeof(sc->pst_creg)) == 0 &&
 682                             memcmp(&pst->pst_sreg, &sc->pst_sreg,
 683                                 sizeof(sc->pst_sreg)) == 0) {
 684                                 /*
 685                                  * Use the same domain for CPUs in the
 686                                  * same package.
 687                                  */
 688                                 device_printf(dev, "Destroy domain%u, "
 689                                     "force pkg domain%u\n",
 690                                     dom->pd_dom, dom1->pd_dom);
 691                                 LIST_REMOVE(dom, pd_link);
 692                                 kfree(dom, M_DEVBUF);
 693                                 dom = dom1;
 694                                 /*
 695                                  * Make sure that adding us will not
 696                                  * overflow the domain containing
 697                                  * siblings in the same package.
 698                                  */
 699                                 acpi_pst_domain_check_nproc(dev, dom);
 700                         }
 701                 }
 702         }
 703
 704         /* Link us with the domain */
 705         sc->pst_domain = dom;
 706         LIST_INSERT_HEAD(&dom->pd_pstlist, sc, pst_link);
 707
 708         if (device_get_unit(dev) == 0)
 709                 AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_pst_postattach, NULL);
 710
 711         return 0;
 712 }
 713
 714 static struct acpi_pst_domain *
 715 acpi_pst_domain_create_pkg(device_t dev, ACPI_OBJECT *obj)
 716 {
 717         struct acpi_pst_domain *dom;
 718         uint32_t val, domain, coord, nproc;
 719
 720         if (!ACPI_PKG_VALID_EQ(obj, 5)) {
 721                 device_printf(dev, "Invalid _PSD package\n");
 722                 return NULL;
 723         }
 724
 725         /* NumberOfEntries */
 726         if (acpi_PkgInt32(obj, 0, &val) != 0 || val != 5) {
 727                 device_printf(dev, "Invalid _PSD NumberOfEntries\n");
 728                 return NULL;
 729         }
 730
 731         /* Revision */
 732         if (acpi_PkgInt32(obj, 1, &val) != 0 || val != 0) {
 733                 device_printf(dev, "Invalid _PSD Revision\n");
 734                 return NULL;
 735         }
 736
 737         if (acpi_PkgInt32(obj, 2, &domain) != 0 ||
 738             acpi_PkgInt32(obj, 3, &coord) != 0 ||
 739             acpi_PkgInt32(obj, 4, &nproc) != 0) {
 740                 device_printf(dev, "Can't extract _PSD package\n");
 741                 return NULL;
 742         }
 743
 744         if (!ACPI_PSD_COORD_VALID(coord)) {
 745                 device_printf(dev, "Invalid _PSD CoordType (%#x)\n", coord);
 746                 return NULL;
 747         }
 748
 749         if (nproc > MAXCPU) {
 750                 /*
 751                  * If NumProcessors is greater than MAXCPU
 752                  * and domain's coordination is SWALL, then
 753                  * we will never be able to start all CPUs
 754                  * within this domain, and power state
 755                  * transition will never be completed, so we
 756                  * just bail out here.
 757                  */
 758                 if (coord == ACPI_PSD_COORD_SWALL) {
 759                         device_printf(dev, "Unsupported _PSD NumProcessors "
 760                                       "(%d)\n", nproc);
 761                         return NULL;
 762                 }
 763         } else if (nproc == 0) {
 764                 device_printf(dev, "_PSD NumProcessors are zero\n");
 765                 return NULL;
 766         }
 767
 768         dom = acpi_pst_domain_find(domain);
 769         if (dom != NULL) {
 770                 if (dom->pd_flags & ACPI_PSTDOM_FLAG_INT) {
 771                         device_printf(dev, "Mixed Integer _PSD and "
 772                             "Package _PSD\n");
 773                         return NULL;
 774                 }
 775                 if (dom->pd_coord != coord) {
 776                         device_printf(dev, "Inconsistent _PSD coord "
 777                             "information cross Processor objects\n");
 778                         return NULL;
 779                 }
 780                 if (dom->pd_nproc != nproc) {
 781                         device_printf(dev, "Inconsistent _PSD nproc "
 782                             "information cross Processor objects\n");
 783                         /*
 784                          * Some stupid BIOSes will set wrong "# of processors",
 785                          * e.g. 1 for CPU w/ hyperthreading; Be lenient here.
 786                          */
 787                 }
 788                 return dom;
 789         }
 790
 791         dom = acpi_pst_domain_alloc(domain, coord, nproc);
 792         if (bootverbose) {
 793                 device_printf(dev, "create pkg domain%u, coord %#x\n",
 794                     dom->pd_dom, dom->pd_coord);
 795         }
 796
 797         return dom;
 798 }
 799
 800 static struct acpi_pst_domain *
 801 acpi_pst_domain_create_int(device_t dev, uint32_t domain)
 802 {
 803         struct acpi_pst_domain *dom;
 804
 805         dom = acpi_pst_domain_find(domain);
 806         if (dom != NULL) {
 807                 if ((dom->pd_flags & ACPI_PSTDOM_FLAG_INT) == 0) {
 808                         device_printf(dev, "Mixed Package _PSD and "
 809                             "Integer _PSD\n");
 810                         return NULL;
 811                 }
 812                 KKASSERT(dom->pd_coord == ACPI_PSD_COORD_SWALL);
 813
 814                 dom->pd_nproc++;
 815                 return dom;
 816         }
 817
 818         dom = acpi_pst_domain_alloc(domain, ACPI_PSD_COORD_SWALL, 1);
 819         dom->pd_flags |= ACPI_PSTDOM_FLAG_INT;
 820
 821         if (bootverbose)
 822                 device_printf(dev, "create int domain%u\n", dom->pd_dom);
 823
 824         return dom;
 825 }
 826
 827 static struct acpi_pst_domain *
 828 acpi_pst_domain_find(uint32_t domain)
 829 {
 830         struct acpi_pst_domain *dom;
 831
 832         LIST_FOREACH(dom, &acpi_pst_domains, pd_link) {
 833                 if (dom->pd_flags & ACPI_PSTDOM_FLAG_STUB)
 834                         continue;
 835                 if (dom->pd_dom == domain)
 836                         return dom;
 837         }
 838         return NULL;
 839 }
 840
 841 static struct acpi_pst_domain *
 842 acpi_pst_domain_alloc(uint32_t domain, uint32_t coord, uint32_t nproc)
 843 {
 844         struct acpi_pst_domain *dom;
 845
 846         dom = kmalloc(sizeof(*dom), M_DEVBUF, M_WAITOK | M_ZERO);
 847         dom->pd_dom = domain;
 848         dom->pd_coord = coord;
 849         dom->pd_nproc = nproc;
 850         dom->pd_state = 0; /* XXX */
 851         dom->pd_sstart = 0; /* XXX */
 852         LIST_INIT(&dom->pd_pstlist);
 853
 854         LIST_INSERT_HEAD(&acpi_pst_domains, dom, pd_link);
 855
 856         return dom;
 857 }
 858
 859 static int
 860 acpi_pst_domain_set_pstate(struct acpi_pst_domain *dom, int i)
 861 {
 862         const struct acpi_pstate *pstate;
 863         struct acpi_pst_softc *sc;
 864         int done, error;
 865
 866         KKASSERT(i >= 0 && i < acpi_npstates);
 867         pstate = &acpi_pstates[i];
 868
 869         done = 0;
 870         LIST_FOREACH(sc, &dom->pd_pstlist, pst_link) {
 871                 if (!done) {
 872                         error = acpi_pst_set_pstate(sc, pstate);
 873                         if (error) {
 874                                 device_printf(sc->pst_dev, "can't set "
 875                                               "freq %d\n", pstate->st_freq);
 876                                 /* XXX error cleanup? */
 877                         }
 878                         if (dom->pd_coord == ACPI_PSD_COORD_SWANY)
 879                                 done = 1;
 880                 }
 881                 sc->pst_state = i;
 882         }
 883         dom->pd_state = i;
 884
 885         return 0;
 886 }
 887
 888 static int
 889 acpi_pst_global_set_pstate(int i)
 890 {
 891         struct acpi_pst_domain *dom;
 892
 893         LIST_FOREACH(dom, &acpi_pst_domains, pd_link) {
 894                 /* Skip dead domain */
 895                 if (dom->pd_flags & ACPI_PSTDOM_FLAG_DEAD)
 896                         continue;
 897                 acpi_pst_domain_set_pstate(dom, i);
 898         }
 899         acpi_pst_global_state = i;
 900
 901         return 0;
 902 }
 903
 904 static void
 905 acpi_pst_postattach(void *arg __unused)
 906 {
 907         struct acpi_pst_domain *dom;
 908         struct acpi_cpu_softc *cpu;
 909         device_t *devices;
 910         int i, ndevices, error, has_domain, sstate;
 911
 912         devices = NULL;
 913         ndevices = 0;
 914         error = devclass_get_devices(acpi_pst_devclass, &devices, &ndevices);
 915         if (error)
 916                 return;
 917
 918         if (ndevices == 0)
 919                 return;
 920
 921         cpu = NULL;
 922         for (i = 0; i < ndevices; ++i) {
 923                 cpu = device_get_softc(device_get_parent(devices[i]));
 924                 if (cpu->glob_sysctl_tree != NULL)
 925                         break;
 926         }
 927         kfree(devices, M_TEMP);
 928         KKASSERT(cpu != NULL);
 929
 930         if (acpi_pst_md == NULL)
 931                 kprintf("ACPI: no P-State CPU driver\n");
 932
 933         sstate = 0x7fffffff;
 934         has_domain = 0;
 935         LIST_FOREACH(dom, &acpi_pst_domains, pd_link) {
 936                 struct acpi_pst_softc *sc;
 937                 char buf[32];
 938
 939                 /*
 940                  * Make sure that all processors belonging to this
 941                  * domain are located.
 942                  */
 943                 i = 0;
 944                 LIST_FOREACH(sc, &dom->pd_pstlist, pst_link)
 945                         ++i;
 946                 if (i != dom->pd_nproc) {
 947                         KKASSERT(i < dom->pd_nproc);
 948
 949                         kprintf("ACPI: domain%u misses processors, "
 950                                 "should be %d, got %d\n", dom->pd_dom,
 951                                 dom->pd_nproc, i);
 952                         if (dom->pd_coord == ACPI_PSD_COORD_SWALL) {
 953                                 /*
 954                                  * If this domain's coordination is
 955                                  * SWALL and we don't see all of the
 956                                  * member CPUs of this domain, then
 957                                  * the P-State transition will never
 958                                  * be completed, so just leave this
 959                                  * domain out.
 960                                  */
 961                                 dom->pd_flags |= ACPI_PSTDOM_FLAG_DEAD;
 962                                 continue;
 963                         }
 964                         dom->pd_nproc = i;
 965                 }
 966
 967                 /*
 968                  * Validate P-State configurations for this domain
 969                  */
 970                 LIST_FOREACH(sc, &dom->pd_pstlist, pst_link) {
 971                         error = acpi_pst_check_csr(sc);
 972                         if (error)
 973                                 break;
 974
 975                         error = acpi_pst_check_pstates(sc);
 976                         if (error)
 977                                 break;
 978                 }
 979                 if (sc != NULL) {
 980                         kprintf("ACPI: domain%u P-State configuration "
 981                                 "check failed\n", dom->pd_dom);
 982                         dom->pd_flags |= ACPI_PSTDOM_FLAG_DEAD;
 983                         continue;
 984                 }
 985
 986                 /*
 987                  * Do necssary P-State initialization
 988                  */
 989                 LIST_FOREACH(sc, &dom->pd_pstlist, pst_link) {
 990                         error = acpi_pst_init(sc);
 991                         if (error)
 992                                 break;
 993                 }
 994                 if (sc != NULL) {
 995                         kprintf("ACPI: domain%u P-State initialization "
 996                                 "check failed\n", dom->pd_dom);
 997                         dom->pd_flags |= ACPI_PSTDOM_FLAG_DEAD;
 998                         continue;
 999                 }
1000
1001                 has_domain = 1;
1002
1003                 ksnprintf(buf, sizeof(buf), "px_dom%u", dom->pd_dom);
1004
1005                 sysctl_ctx_init(&dom->pd_sysctl_ctx);
1006                 dom->pd_sysctl_tree =
1007                 SYSCTL_ADD_NODE(&dom->pd_sysctl_ctx,
1008                         SYSCTL_CHILDREN(cpu->glob_sysctl_tree),
1009                         OID_AUTO, buf, CTLFLAG_RD, 0,
1010                         "P-State domain");
1011                 if (dom->pd_sysctl_tree == NULL) {
1012                         kprintf("ACPI: Can't create sysctl tree for domain%u",
1013                                 dom->pd_dom);
1014                         continue;
1015                 }
1016
1017                 SYSCTL_ADD_PROC(&dom->pd_sysctl_ctx,
1018                                 SYSCTL_CHILDREN(dom->pd_sysctl_tree),
1019                                 OID_AUTO, "available",
1020                                 CTLTYPE_STRING | CTLFLAG_RD,
1021                                 dom, 0, acpi_pst_sysctl_freqs, "A",
1022                                 "available frequencies");
1023
1024                 SYSCTL_ADD_PROC(&dom->pd_sysctl_ctx,
1025                                 SYSCTL_CHILDREN(dom->pd_sysctl_tree),
1026                                 OID_AUTO, "members",
1027                                 CTLTYPE_STRING | CTLFLAG_RD,
1028                                 dom, 0, acpi_pst_sysctl_members, "A",
1029                                 "member cpus");
1030
1031                 if (acpi_pst_md != NULL &&
1032                     acpi_pst_md->pmd_set_pstate != NULL) {
1033                         SYSCTL_ADD_PROC(&dom->pd_sysctl_ctx,
1034                                         SYSCTL_CHILDREN(dom->pd_sysctl_tree),
1035                                         OID_AUTO, "select",
1036                                         CTLTYPE_UINT | CTLFLAG_RW,
1037                                         dom, 0, acpi_pst_sysctl_select,
1038                                         "IU", "select freq");
1039                 }
1040
1041                 if (dom->pd_state < sstate)
1042                         sstate = dom->pd_state;
1043         }
1044
1045         if (has_domain && acpi_pst_md != NULL &&
1046             acpi_pst_md->pmd_set_pstate != NULL) {
1047                 SYSCTL_ADD_PROC(&cpu->glob_sysctl_ctx,
1048                                 SYSCTL_CHILDREN(cpu->glob_sysctl_tree),
1049                                 OID_AUTO, "px_global",
1050                                 CTLTYPE_UINT | CTLFLAG_RW,
1051                                 NULL, 0, acpi_pst_sysctl_global,
1052                                 "IU", "select freq for all domains");
1053
1054                 acpi_pst_global_set_pstate(sstate);
1055         }
1056 }
1057
1058 static int
1059 acpi_pst_sysctl_freqs(SYSCTL_HANDLER_ARGS)
1060 {
1061         struct acpi_pst_domain *dom = arg1;
1062         int i, error;
1063
1064         error = 0;
1065         for (i = 0; i < acpi_npstates; ++i) {
1066                 if (error == 0 && i)
1067                         error = SYSCTL_OUT(req, " ", 1);
1068                 if (error == 0) {
1069                         const char *pat;
1070                         char buf[32];
1071
1072                         if (i < dom->pd_sstart)
1073                                 pat = "(%u)";
1074                         else
1075                                 pat = "%u";
1076
1077                         ksnprintf(buf, sizeof(buf), pat,
1078                                   acpi_pstates[i].st_freq);
1079                         error = SYSCTL_OUT(req, buf, strlen(buf));
1080                 }
1081         }
1082         return error;
1083 }
1084
1085 static int
1086 acpi_pst_sysctl_members(SYSCTL_HANDLER_ARGS)
1087 {
1088         struct acpi_pst_domain *dom = arg1;
1089         struct acpi_pst_softc *sc;
1090         int loop, error;
1091
1092         loop = error = 0;
1093         LIST_FOREACH(sc, &dom->pd_pstlist, pst_link) {
1094                 char buf[32];
1095
1096                 if (error == 0 && loop)
1097                         error = SYSCTL_OUT(req, " ", 1);
1098                 if (error == 0) {
1099                         ksnprintf(buf, sizeof(buf), "cpu%d", sc->pst_cpuid);
1100                         error = SYSCTL_OUT(req, buf, strlen(buf));
1101                 }
1102
1103                 if (error == 0 && acpi_pst_md && acpi_pst_md->pmd_get_pstate) {
1104                         const struct acpi_pstate *pstate;
1105                         const char *str;
1106
1107                         pstate = acpi_pst_get_pstate(sc);
1108                         if (pstate == NULL) {
1109                                 str = "(*)";
1110                         } else {
1111                                 ksnprintf(buf, sizeof(buf), "(%d)",
1112                                           pstate->st_freq);
1113                                 str = buf;
1114                         }
1115                         error = SYSCTL_OUT(req, str, strlen(str));
1116                 }
1117                 ++loop;
1118         }
1119         return error;
1120 }
1121
1122 static int
1123 acpi_pst_sysctl_select(SYSCTL_HANDLER_ARGS)
1124 {
1125         struct acpi_pst_domain *dom = arg1;
1126         int error, i, freq;
1127
1128         KKASSERT(dom->pd_state >= 0 && dom->pd_state < acpi_npstates);
1129
1130         freq = acpi_pstates[dom->pd_state].st_freq;
1131
1132         error = sysctl_handle_int(oidp, &freq, 0, req);
1133         if (error || req->newptr == NULL)
1134                 return error;
1135
1136         i = acpi_pst_freq2index(freq);
1137         if (i < 0)
1138                 return EINVAL;
1139
1140         acpi_pst_domain_set_pstate(dom, i);
1141         return 0;
1142 }
1143
1144 static int
1145 acpi_pst_sysctl_global(SYSCTL_HANDLER_ARGS)
1146 {
1147         int error, i, freq;
1148
1149         KKASSERT(acpi_pst_global_state >= 0 &&
1150                  acpi_pst_global_state < acpi_npstates);
1151
1152         freq = acpi_pstates[acpi_pst_global_state].st_freq;
1153
1154         error = sysctl_handle_int(oidp, &freq, 0, req);
1155         if (error || req->newptr == NULL)
1156                 return error;
1157
1158         i = acpi_pst_freq2index(freq);
1159         if (i < 0)
1160                 return EINVAL;
1161
1162         acpi_pst_global_set_pstate(i);
1163
1164         return 0;
1165 }
1166
1167 static void
1168 acpi_pst_check_csr_handler(netmsg_t msg)
1169 {
1170         struct netmsg_acpi_pst *rmsg = (struct netmsg_acpi_pst *)msg;
1171         int error;
1172
1173         error = acpi_pst_md->pmd_check_csr(rmsg->ctrl, rmsg->status);
1174         lwkt_replymsg(&rmsg->base.lmsg, error);
1175 }
1176
1177 static int
1178 acpi_pst_check_csr(struct acpi_pst_softc *sc)
1179 {
1180         struct netmsg_acpi_pst msg;
1181
1182         if (acpi_pst_md == NULL)
1183                 return 0;
1184
1185         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
1186                     MSGF_PRIORITY, acpi_pst_check_csr_handler);
1187         msg.ctrl = &sc->pst_creg;
1188         msg.status = &sc->pst_sreg;
1189
1190         return lwkt_domsg(netisr_cpuport(sc->pst_cpuid), &msg.base.lmsg, 0);
1191 }
1192
1193 static void
1194 acpi_pst_check_pstates_handler(netmsg_t msg)
1195 {
1196         int error;
1197
1198         error = acpi_pst_md->pmd_check_pstates(acpi_pstates, acpi_npstates);
1199         lwkt_replymsg(&msg->lmsg, error);
1200 }
1201
1202 static int
1203 acpi_pst_check_pstates(struct acpi_pst_softc *sc)
1204 {
1205         struct netmsg_base msg;
1206
1207         if (acpi_pst_md == NULL)
1208                 return 0;
1209
1210         netmsg_init(&msg, NULL, &curthread->td_msgport,
1211                     MSGF_PRIORITY, acpi_pst_check_pstates_handler);
1212
1213         return lwkt_domsg(netisr_cpuport(sc->pst_cpuid), &msg.lmsg, 0);
1214 }
1215
1216 static void
1217 acpi_pst_init_handler(netmsg_t msg)
1218 {
1219         struct netmsg_acpi_pst *rmsg = (struct netmsg_acpi_pst *)msg;
1220         int error;
1221
1222         error = acpi_pst_md->pmd_init(rmsg->ctrl, rmsg->status);
1223         lwkt_replymsg(&rmsg->base.lmsg, error);
1224 }
1225
1226 static int
1227 acpi_pst_init(struct acpi_pst_softc *sc)
1228 {
1229         struct netmsg_acpi_pst msg;
1230
1231         if (acpi_pst_md == NULL)
1232                 return 0;
1233
1234         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
1235                     MSGF_PRIORITY, acpi_pst_init_handler);
1236         msg.ctrl = &sc->pst_creg;
1237         msg.status = &sc->pst_sreg;
1238
1239         return lwkt_domsg(netisr_cpuport(sc->pst_cpuid), &msg.base.lmsg, 0);
1240 }
1241
1242 static void
1243 acpi_pst_set_pstate_handler(netmsg_t msg)
1244 {
1245         struct netmsg_acpi_pst *rmsg = (struct netmsg_acpi_pst *)msg;
1246         int error;
1247
1248         error = acpi_pst_md->pmd_set_pstate(rmsg->ctrl, rmsg->status,
1249                                             rmsg->base.lmsg.u.ms_resultp);
1250         lwkt_replymsg(&rmsg->base.lmsg, error);
1251 }
1252
1253 static int
1254 acpi_pst_set_pstate(struct acpi_pst_softc *sc, const struct acpi_pstate *pstate)
1255 {
1256         struct netmsg_acpi_pst msg;
1257
1258         KKASSERT(acpi_pst_md != NULL);
1259
1260         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
1261                     MSGF_PRIORITY, acpi_pst_set_pstate_handler);
1262         msg.base.lmsg.u.ms_resultp = __DECONST(void *, pstate);
1263         msg.ctrl = &sc->pst_creg;
1264         msg.status = &sc->pst_sreg;
1265
1266         return lwkt_domsg(netisr_cpuport(sc->pst_cpuid), &msg.base.lmsg, 0);
1267 }
1268
1269 static void
1270 acpi_pst_get_pstate_handler(netmsg_t msg)
1271 {
1272         struct netmsg_acpi_pst *rmsg = (struct netmsg_acpi_pst *)msg;
1273         const struct acpi_pstate *pstate;
1274
1275         pstate = acpi_pst_md->pmd_get_pstate(rmsg->status, acpi_pstates,
1276                                              acpi_npstates);
1277         rmsg->base.lmsg.u.ms_resultp = __DECONST(void *, pstate);
1278         lwkt_replymsg(&rmsg->base.lmsg, 0);
1279 }
1280
1281 static const struct acpi_pstate *
1282 acpi_pst_get_pstate(struct acpi_pst_softc *sc)
1283 {
1284         struct netmsg_acpi_pst msg;
1285
1286         if (acpi_pst_md == NULL)
1287                 return 0;
1288
1289         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
1290                     MSGF_PRIORITY, acpi_pst_get_pstate_handler);
1291         msg.status = &sc->pst_sreg;
1292
1293         lwkt_domsg(netisr_cpuport(sc->pst_cpuid), &msg.base.lmsg, 0);
1294         return msg.base.lmsg.u.ms_resultp;
1295 }
1296
1297 static int
1298 acpi_pst_alloc_resource(device_t dev, ACPI_OBJECT *obj, int idx,
1299                         struct acpi_pst_res *res)
1300 {
1301         struct acpi_pst_softc *sc = device_get_softc(dev);
1302         int error, type;
1303
1304         /* Save GAS */
1305         error = acpi_PkgRawGas(obj, idx, &res->pr_gas);
1306         if (error)
1307                 return error;
1308
1309         /* Allocate resource, if possible */
1310         res->pr_rid = sc->pst_parent->cpu_next_rid;
1311         acpi_bus_alloc_gas(dev, &type, &res->pr_rid, &res->pr_gas, &res->pr_res, 0);
1312         if (res->pr_res != NULL) {
1313                 sc->pst_parent->cpu_next_rid++;
1314                 res->pr_bt = rman_get_bustag(res->pr_res);
1315                 res->pr_bh = rman_get_bushandle(res->pr_res);
1316         } else {
1317                 res->pr_rid = 0;
1318         }
1319         return 0;
1320 }
1321
1322 static void
1323 acpi_pst_domain_check_nproc(device_t dev, struct acpi_pst_domain *dom)
1324 {
1325         struct acpi_pst_softc *pst;
1326         int i;
1327
1328         i = 0;
1329         LIST_FOREACH(pst, &dom->pd_pstlist, pst_link)
1330                 ++i;
1331         if (i == dom->pd_nproc) {
1332                 /*
1333                  * Some stupid BIOSes will set wrong "# of processors",
1334                  * e.g. 1 for CPU w/ hyperthreading; Be lenient here.
1335                  */
1336                 if (bootverbose) {
1337                         device_printf(dev, "domain%u already contains %d "
1338                             "P-States\n", dom->pd_dom, dom->pd_nproc);
1339                 }
1340                 dom->pd_nproc++;
1341         }
1342         KKASSERT(i < dom->pd_nproc);
1343 }