linux/drivers/xen/xen-acpi-processor.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright 2012 by Oracle Inc
   4 * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
   5 *
   6 * This code borrows ideas from
   7 * https://lore.kernel.org/lkml/1322673664-14642-6-git-send-email-konrad.wilk@oracle.com
   8 * so many thanks go to Kevin Tian <kevin.tian@intel.com>
   9 * and Yu Ke <ke.yu@intel.com>.
  10 */
  11
  12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14#include <linux/cpumask.h>
  15#include <linux/cpufreq.h>
  16#include <linux/freezer.h>
  17#include <linux/kernel.h>
  18#include <linux/kthread.h>
  19#include <linux/init.h>
  20#include <linux/module.h>
  21#include <linux/types.h>
  22#include <linux/syscore_ops.h>
  23#include <linux/acpi.h>
  24#include <acpi/processor.h>
  25#include <xen/xen.h>
  26#include <xen/interface/platform.h>
  27#include <asm/xen/hypercall.h>
  28
  29static int no_hypercall;
  30MODULE_PARM_DESC(off, "Inhibit the hypercall.");
  31module_param_named(off, no_hypercall, int, 0400);
  32
  33/*
  34 * Note: Do not convert the acpi_id* below to cpumask_var_t or use cpumask_bit
  35 * - as those shrink to nr_cpu_bits (which is dependent on possible_cpu), which
  36 * can be less than what we want to put in. Instead use the 'nr_acpi_bits'
  37 * which is dynamically computed based on the MADT or x2APIC table.
  38 */
  39static unsigned int nr_acpi_bits;
  40/* Mutex to protect the acpi_ids_done - for CPU hotplug use. */
  41static DEFINE_MUTEX(acpi_ids_mutex);
  42/* Which ACPI ID we have processed from 'struct acpi_processor'. */
  43static unsigned long *acpi_ids_done;
  44/* Which ACPI ID exist in the SSDT/DSDT processor definitions. */
  45static unsigned long *acpi_id_present;
  46/* And if there is an _CST definition (or a PBLK) for the ACPI IDs */
  47static unsigned long *acpi_id_cst_present;
  48/* Which ACPI P-State dependencies for a enumerated processor */
  49static struct acpi_psd_package *acpi_psd;
  50
  51static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
  52{
  53        struct xen_platform_op op = {
  54                .cmd                    = XENPF_set_processor_pminfo,
  55                .interface_version      = XENPF_INTERFACE_VERSION,
  56                .u.set_pminfo.id        = _pr->acpi_id,
  57                .u.set_pminfo.type      = XEN_PM_CX,
  58        };
  59        struct xen_processor_cx *dst_cx, *dst_cx_states = NULL;
  60        struct acpi_processor_cx *cx;
  61        unsigned int i, ok;
  62        int ret = 0;
  63
  64        dst_cx_states = kcalloc(_pr->power.count,
  65                                sizeof(struct xen_processor_cx), GFP_KERNEL);
  66        if (!dst_cx_states)
  67                return -ENOMEM;
  68
  69        for (ok = 0, i = 1; i <= _pr->power.count; i++) {
  70                cx = &_pr->power.states[i];
  71                if (!cx->valid)
  72                        continue;
  73
  74                dst_cx = &(dst_cx_states[ok++]);
  75
  76                dst_cx->reg.space_id = ACPI_ADR_SPACE_SYSTEM_IO;
  77                if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
  78                        dst_cx->reg.bit_width = 8;
  79                        dst_cx->reg.bit_offset = 0;
  80                        dst_cx->reg.access_size = 1;
  81                } else {
  82                        dst_cx->reg.space_id = ACPI_ADR_SPACE_FIXED_HARDWARE;
  83                        if (cx->entry_method == ACPI_CSTATE_FFH) {
  84                                /* NATIVE_CSTATE_BEYOND_HALT */
  85                                dst_cx->reg.bit_offset = 2;
  86                                dst_cx->reg.bit_width = 1; /* VENDOR_INTEL */
  87                        }
  88                        dst_cx->reg.access_size = 0;
  89                }
  90                dst_cx->reg.address = cx->address;
  91
  92                dst_cx->type = cx->type;
  93                dst_cx->latency = cx->latency;
  94
  95                dst_cx->dpcnt = 0;
  96                set_xen_guest_handle(dst_cx->dp, NULL);
  97        }
  98        if (!ok) {
  99                pr_debug("No _Cx for ACPI CPU %u\n", _pr->acpi_id);
 100                kfree(dst_cx_states);
 101                return -EINVAL;
 102        }
 103        op.u.set_pminfo.power.count = ok;
 104        op.u.set_pminfo.power.flags.bm_control = _pr->flags.bm_control;
 105        op.u.set_pminfo.power.flags.bm_check = _pr->flags.bm_check;
 106        op.u.set_pminfo.power.flags.has_cst = _pr->flags.has_cst;
 107        op.u.set_pminfo.power.flags.power_setup_done =
 108                _pr->flags.power_setup_done;
 109
 110        set_xen_guest_handle(op.u.set_pminfo.power.states, dst_cx_states);
 111
 112        if (!no_hypercall)
 113                ret = HYPERVISOR_platform_op(&op);
 114
 115        if (!ret) {
 116                pr_debug("ACPI CPU%u - C-states uploaded.\n", _pr->acpi_id);
 117                for (i = 1; i <= _pr->power.count; i++) {
 118                        cx = &_pr->power.states[i];
 119                        if (!cx->valid)
 120                                continue;
 121                        pr_debug("     C%d: %s %d uS\n",
 122                                 cx->type, cx->desc, (u32)cx->latency);
 123                }
 124        } else if ((ret != -EINVAL) && (ret != -ENOSYS))
 125                /* EINVAL means the ACPI ID is incorrect - meaning the ACPI
 126                 * table is referencing a non-existing CPU - which can happen
 127                 * with broken ACPI tables. */
 128                pr_err("(CX): Hypervisor error (%d) for ACPI CPU%u\n",
 129                       ret, _pr->acpi_id);
 130
 131        kfree(dst_cx_states);
 132
 133        return ret;
 134}
 135static struct xen_processor_px *
 136xen_copy_pss_data(struct acpi_processor *_pr,
 137                  struct xen_processor_performance *dst_perf)
 138{
 139        struct xen_processor_px *dst_states = NULL;
 140        unsigned int i;
 141
 142        BUILD_BUG_ON(sizeof(struct xen_processor_px) !=
 143                     sizeof(struct acpi_processor_px));
 144
 145        dst_states = kcalloc(_pr->performance->state_count,
 146                             sizeof(struct xen_processor_px), GFP_KERNEL);
 147        if (!dst_states)
 148                return ERR_PTR(-ENOMEM);
 149
 150        dst_perf->state_count = _pr->performance->state_count;
 151        for (i = 0; i < _pr->performance->state_count; i++) {
 152                /* Fortunatly for us, they are both the same size */
 153                memcpy(&(dst_states[i]), &(_pr->performance->states[i]),
 154                       sizeof(struct acpi_processor_px));
 155        }
 156        return dst_states;
 157}
 158static int xen_copy_psd_data(struct acpi_processor *_pr,
 159                             struct xen_processor_performance *dst)
 160{
 161        struct acpi_psd_package *pdomain;
 162
 163        BUILD_BUG_ON(sizeof(struct xen_psd_package) !=
 164                     sizeof(struct acpi_psd_package));
 165
 166        /* This information is enumerated only if acpi_processor_preregister_performance
 167         * has been called.
 168         */
 169        dst->shared_type = _pr->performance->shared_type;
 170
 171        pdomain = &(_pr->performance->domain_info);
 172
 173        /* 'acpi_processor_preregister_performance' does not parse if the
 174         * num_processors <= 1, but Xen still requires it. Do it manually here.
 175         */
 176        if (pdomain->num_processors <= 1) {
 177                if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
 178                        dst->shared_type = CPUFREQ_SHARED_TYPE_ALL;
 179                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
 180                        dst->shared_type = CPUFREQ_SHARED_TYPE_HW;
 181                else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
 182                        dst->shared_type = CPUFREQ_SHARED_TYPE_ANY;
 183
 184        }
 185        memcpy(&(dst->domain_info), pdomain, sizeof(struct acpi_psd_package));
 186        return 0;
 187}
 188static int xen_copy_pct_data(struct acpi_pct_register *pct,
 189                             struct xen_pct_register *dst_pct)
 190{
 191        /* It would be nice if you could just do 'memcpy(pct, dst_pct') but
 192         * sadly the Xen structure did not have the proper padding so the
 193         * descriptor field takes two (dst_pct) bytes instead of one (pct).
 194         */
 195        dst_pct->descriptor = pct->descriptor;
 196        dst_pct->length = pct->length;
 197        dst_pct->space_id = pct->space_id;
 198        dst_pct->bit_width = pct->bit_width;
 199        dst_pct->bit_offset = pct->bit_offset;
 200        dst_pct->reserved = pct->reserved;
 201        dst_pct->address = pct->address;
 202        return 0;
 203}
 204static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
 205{
 206        int ret = 0;
 207        struct xen_platform_op op = {
 208                .cmd                    = XENPF_set_processor_pminfo,
 209                .interface_version      = XENPF_INTERFACE_VERSION,
 210                .u.set_pminfo.id        = _pr->acpi_id,
 211                .u.set_pminfo.type      = XEN_PM_PX,
 212        };
 213        struct xen_processor_performance *dst_perf;
 214        struct xen_processor_px *dst_states = NULL;
 215
 216        dst_perf = &op.u.set_pminfo.perf;
 217
 218        dst_perf->platform_limit = _pr->performance_platform_limit;
 219        dst_perf->flags |= XEN_PX_PPC;
 220        xen_copy_pct_data(&(_pr->performance->control_register),
 221                          &dst_perf->control_register);
 222        xen_copy_pct_data(&(_pr->performance->status_register),
 223                          &dst_perf->status_register);
 224        dst_perf->flags |= XEN_PX_PCT;
 225        dst_states = xen_copy_pss_data(_pr, dst_perf);
 226        if (!IS_ERR_OR_NULL(dst_states)) {
 227                set_xen_guest_handle(dst_perf->states, dst_states);
 228                dst_perf->flags |= XEN_PX_PSS;
 229        }
 230        if (!xen_copy_psd_data(_pr, dst_perf))
 231                dst_perf->flags |= XEN_PX_PSD;
 232
 233        if (dst_perf->flags != (XEN_PX_PSD | XEN_PX_PSS | XEN_PX_PCT | XEN_PX_PPC)) {
 234                pr_warn("ACPI CPU%u missing some P-state data (%x), skipping\n",
 235                        _pr->acpi_id, dst_perf->flags);
 236                ret = -ENODEV;
 237                goto err_free;
 238        }
 239
 240        if (!no_hypercall)
 241                ret = HYPERVISOR_platform_op(&op);
 242
 243        if (!ret) {
 244                struct acpi_processor_performance *perf;
 245                unsigned int i;
 246
 247                perf = _pr->performance;
 248                pr_debug("ACPI CPU%u - P-states uploaded.\n", _pr->acpi_id);
 249                for (i = 0; i < perf->state_count; i++) {
 250                        pr_debug("     %cP%d: %d MHz, %d mW, %d uS\n",
 251                        (i == perf->state ? '*' : ' '), i,
 252                        (u32) perf->states[i].core_frequency,
 253                        (u32) perf->states[i].power,
 254                        (u32) perf->states[i].transition_latency);
 255                }
 256        } else if ((ret != -EINVAL) && (ret != -ENOSYS))
 257                /* EINVAL means the ACPI ID is incorrect - meaning the ACPI
 258                 * table is referencing a non-existing CPU - which can happen
 259                 * with broken ACPI tables. */
 260                pr_warn("(_PXX): Hypervisor error (%d) for ACPI CPU%u\n",
 261                        ret, _pr->acpi_id);
 262err_free:
 263        if (!IS_ERR_OR_NULL(dst_states))
 264                kfree(dst_states);
 265
 266        return ret;
 267}
 268static int upload_pm_data(struct acpi_processor *_pr)
 269{
 270        int err = 0;
 271
 272        mutex_lock(&acpi_ids_mutex);
 273        if (__test_and_set_bit(_pr->acpi_id, acpi_ids_done)) {
 274                mutex_unlock(&acpi_ids_mutex);
 275                return -EBUSY;
 276        }
 277        if (_pr->flags.power)
 278                err = push_cxx_to_hypervisor(_pr);
 279
 280        if (_pr->performance && _pr->performance->states)
 281                err |= push_pxx_to_hypervisor(_pr);
 282
 283        mutex_unlock(&acpi_ids_mutex);
 284        return err;
 285}
 286static unsigned int __init get_max_acpi_id(void)
 287{
 288        struct xenpf_pcpuinfo *info;
 289        struct xen_platform_op op = {
 290                .cmd = XENPF_get_cpuinfo,
 291                .interface_version = XENPF_INTERFACE_VERSION,
 292        };
 293        int ret = 0;
 294        unsigned int i, last_cpu, max_acpi_id = 0;
 295
 296        info = &op.u.pcpu_info;
 297        info->xen_cpuid = 0;
 298
 299        ret = HYPERVISOR_platform_op(&op);
 300        if (ret)
 301                return NR_CPUS;
 302
 303        /* The max_present is the same irregardless of the xen_cpuid */
 304        last_cpu = op.u.pcpu_info.max_present;
 305        for (i = 0; i <= last_cpu; i++) {
 306                info->xen_cpuid = i;
 307                ret = HYPERVISOR_platform_op(&op);
 308                if (ret)
 309                        continue;
 310                max_acpi_id = max(info->acpi_id, max_acpi_id);
 311        }
 312        max_acpi_id *= 2; /* Slack for CPU hotplug support. */
 313        pr_debug("Max ACPI ID: %u\n", max_acpi_id);
 314        return max_acpi_id;
 315}
 316/*
 317 * The read_acpi_id and check_acpi_ids are there to support the Xen
 318 * oddity of virtual CPUs != physical CPUs in the initial domain.
 319 * The user can supply 'xen_max_vcpus=X' on the Xen hypervisor line
 320 * which will band the amount of CPUs the initial domain can see.
 321 * In general that is OK, except it plays havoc with any of the
 322 * for_each_[present|online]_cpu macros which are banded to the virtual
 323 * CPU amount.
 324 */
 325static acpi_status
 326read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
 327{
 328        u32 acpi_id;
 329        acpi_status status;
 330        acpi_object_type acpi_type;
 331        unsigned long long tmp;
 332        union acpi_object object = { 0 };
 333        struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 334        acpi_io_address pblk = 0;
 335
 336        status = acpi_get_type(handle, &acpi_type);
 337        if (ACPI_FAILURE(status))
 338                return AE_OK;
 339
 340        switch (acpi_type) {
 341        case ACPI_TYPE_PROCESSOR:
 342                status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
 343                if (ACPI_FAILURE(status))
 344                        return AE_OK;
 345                acpi_id = object.processor.proc_id;
 346                pblk = object.processor.pblk_address;
 347                break;
 348        case ACPI_TYPE_DEVICE:
 349                status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
 350                if (ACPI_FAILURE(status))
 351                        return AE_OK;
 352                acpi_id = tmp;
 353                break;
 354        default:
 355                return AE_OK;
 356        }
 357        if (invalid_phys_cpuid(acpi_get_phys_id(handle,
 358                                                acpi_type == ACPI_TYPE_DEVICE,
 359                                                acpi_id))) {
 360                pr_debug("CPU with ACPI ID %u is unavailable\n", acpi_id);
 361                return AE_OK;
 362        }
 363        /* There are more ACPI Processor objects than in x2APIC or MADT.
 364         * This can happen with incorrect ACPI SSDT declerations. */
 365        if (acpi_id >= nr_acpi_bits) {
 366                pr_debug("max acpi id %u, trying to set %u\n",
 367                         nr_acpi_bits - 1, acpi_id);
 368                return AE_OK;
 369        }
 370        /* OK, There is a ACPI Processor object */
 371        __set_bit(acpi_id, acpi_id_present);
 372
 373        pr_debug("ACPI CPU%u w/ PBLK:0x%lx\n", acpi_id, (unsigned long)pblk);
 374
 375        /* It has P-state dependencies */
 376        if (!acpi_processor_get_psd(handle, &acpi_psd[acpi_id])) {
 377                pr_debug("ACPI CPU%u w/ PST:coord_type = %llu domain = %llu\n",
 378                         acpi_id, acpi_psd[acpi_id].coord_type,
 379                         acpi_psd[acpi_id].domain);
 380        }
 381
 382        status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);
 383        if (ACPI_FAILURE(status)) {
 384                if (!pblk)
 385                        return AE_OK;
 386        }
 387        /* .. and it has a C-state */
 388        __set_bit(acpi_id, acpi_id_cst_present);
 389
 390        return AE_OK;
 391}
 392static int check_acpi_ids(struct acpi_processor *pr_backup)
 393{
 394
 395        if (!pr_backup)
 396                return -ENODEV;
 397
 398        if (acpi_id_present && acpi_id_cst_present)
 399                /* OK, done this once .. skip to uploading */
 400                goto upload;
 401
 402        /* All online CPUs have been processed at this stage. Now verify
 403         * whether in fact "online CPUs" == physical CPUs.
 404         */
 405        acpi_id_present = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL);
 406        if (!acpi_id_present)
 407                return -ENOMEM;
 408
 409        acpi_id_cst_present = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL);
 410        if (!acpi_id_cst_present) {
 411                bitmap_free(acpi_id_present);
 412                return -ENOMEM;
 413        }
 414
 415        acpi_psd = kcalloc(nr_acpi_bits, sizeof(struct acpi_psd_package),
 416                           GFP_KERNEL);
 417        if (!acpi_psd) {
 418                bitmap_free(acpi_id_present);
 419                bitmap_free(acpi_id_cst_present);
 420                return -ENOMEM;
 421        }
 422
 423        acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 424                            ACPI_UINT32_MAX,
 425                            read_acpi_id, NULL, NULL, NULL);
 426        acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, read_acpi_id, NULL, NULL);
 427
 428upload:
 429        if (!bitmap_equal(acpi_id_present, acpi_ids_done, nr_acpi_bits)) {
 430                unsigned int i;
 431                for_each_set_bit(i, acpi_id_present, nr_acpi_bits) {
 432                        pr_backup->acpi_id = i;
 433                        /* Mask out C-states if there are no _CST or PBLK */
 434                        pr_backup->flags.power = test_bit(i, acpi_id_cst_present);
 435                        /* num_entries is non-zero if we evaluated _PSD */
 436                        if (acpi_psd[i].num_entries) {
 437                                memcpy(&pr_backup->performance->domain_info,
 438                                       &acpi_psd[i],
 439                                       sizeof(struct acpi_psd_package));
 440                        }
 441                        (void)upload_pm_data(pr_backup);
 442                }
 443        }
 444
 445        return 0;
 446}
 447
 448/* acpi_perf_data is a pointer to percpu data. */
 449static struct acpi_processor_performance __percpu *acpi_perf_data;
 450
 451static void free_acpi_perf_data(void)
 452{
 453        int i;
 454
 455        /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
 456        for_each_possible_cpu(i)
 457                free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
 458                                 ->shared_cpu_map);
 459        free_percpu(acpi_perf_data);
 460}
 461
 462static int xen_upload_processor_pm_data(void)
 463{
 464        struct acpi_processor *pr_backup = NULL;
 465        int i;
 466        int rc = 0;
 467
 468        pr_info("Uploading Xen processor PM info\n");
 469
 470        for_each_possible_cpu(i) {
 471                struct acpi_processor *_pr;
 472                _pr = per_cpu(processors, i /* APIC ID */);
 473                if (!_pr)
 474                        continue;
 475
 476                if (!pr_backup) {
 477                        pr_backup = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 478                        if (pr_backup)
 479                                memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
 480                }
 481                (void)upload_pm_data(_pr);
 482        }
 483
 484        rc = check_acpi_ids(pr_backup);
 485        kfree(pr_backup);
 486
 487        return rc;
 488}
 489
 490static void xen_acpi_processor_resume_worker(struct work_struct *dummy)
 491{
 492        int rc;
 493
 494        bitmap_zero(acpi_ids_done, nr_acpi_bits);
 495
 496        rc = xen_upload_processor_pm_data();
 497        if (rc != 0)
 498                pr_info("ACPI data upload failed, error = %d\n", rc);
 499}
 500
 501static void xen_acpi_processor_resume(void)
 502{
 503        static DECLARE_WORK(wq, xen_acpi_processor_resume_worker);
 504
 505        /*
 506         * xen_upload_processor_pm_data() calls non-atomic code.
 507         * However, the context for xen_acpi_processor_resume is syscore
 508         * with only the boot CPU online and in an atomic context.
 509         *
 510         * So defer the upload for some point safer.
 511         */
 512        schedule_work(&wq);
 513}
 514
 515static struct syscore_ops xap_syscore_ops = {
 516        .resume = xen_acpi_processor_resume,
 517};
 518
 519static int __init xen_acpi_processor_init(void)
 520{
 521        int i;
 522        int rc;
 523
 524        if (!xen_initial_domain())
 525                return -ENODEV;
 526
 527        nr_acpi_bits = get_max_acpi_id() + 1;
 528        acpi_ids_done = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL);
 529        if (!acpi_ids_done)
 530                return -ENOMEM;
 531
 532        acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
 533        if (!acpi_perf_data) {
 534                pr_debug("Memory allocation error for acpi_perf_data\n");
 535                bitmap_free(acpi_ids_done);
 536                return -ENOMEM;
 537        }
 538        for_each_possible_cpu(i) {
 539                if (!zalloc_cpumask_var_node(
 540                        &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
 541                        GFP_KERNEL, cpu_to_node(i))) {
 542                        rc = -ENOMEM;
 543                        goto err_out;
 544                }
 545        }
 546
 547        /* Do initialization in ACPI core. It is OK to fail here. */
 548        (void)acpi_processor_preregister_performance(acpi_perf_data);
 549
 550        for_each_possible_cpu(i) {
 551                struct acpi_processor *pr;
 552                struct acpi_processor_performance *perf;
 553
 554                pr = per_cpu(processors, i);
 555                perf = per_cpu_ptr(acpi_perf_data, i);
 556                if (!pr)
 557                        continue;
 558
 559                pr->performance = perf;
 560                rc = acpi_processor_get_performance_info(pr);
 561                if (rc)
 562                        goto err_out;
 563        }
 564
 565        rc = xen_upload_processor_pm_data();
 566        if (rc)
 567                goto err_unregister;
 568
 569        register_syscore_ops(&xap_syscore_ops);
 570
 571        return 0;
 572err_unregister:
 573        for_each_possible_cpu(i)
 574                acpi_processor_unregister_performance(i);
 575
 576err_out:
 577        /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
 578        free_acpi_perf_data();
 579        bitmap_free(acpi_ids_done);
 580        return rc;
 581}
 582static void __exit xen_acpi_processor_exit(void)
 583{
 584        int i;
 585
 586        unregister_syscore_ops(&xap_syscore_ops);
 587        bitmap_free(acpi_ids_done);
 588        bitmap_free(acpi_id_present);
 589        bitmap_free(acpi_id_cst_present);
 590        kfree(acpi_psd);
 591        for_each_possible_cpu(i)
 592                acpi_processor_unregister_performance(i);
 593
 594        free_acpi_perf_data();
 595}
 596
 597MODULE_AUTHOR("Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>");
 598MODULE_DESCRIPTION("Xen ACPI Processor P-states (and Cx) driver which uploads PM data to Xen hypervisor");
 599MODULE_LICENSE("GPL");
 600
 601/* We want to be loaded before the CPU freq scaling drivers are loaded.
 602 * They are loaded in late_initcall. */
 603device_initcall(xen_acpi_processor_init);
 604module_exit(xen_acpi_processor_exit);
 605