drivers/cpufreq/cppc_cpufreq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * CPPC (Collaborative Processor Performance Control) driver for
   4  * interfacing with the CPUfreq layer and governors. See
   5  * cppc_acpi.c for CPPC specific methods.
   6  *
   7  * (C) Copyright 2014, 2015 Linaro Ltd.
   8  * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org>
   9  */
  10
  11 #define pr_fmt(fmt)     "CPPC Cpufreq:" fmt
  12
  13 #include <linux/arch_topology.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/cpu.h>
  18 #include <linux/cpufreq.h>
  19 #include <linux/dmi.h>
  20 #include <linux/irq_work.h>
  21 #include <linux/kthread.h>
  22 #include <linux/time.h>
  23 #include <linux/vmalloc.h>
  24 #include <uapi/linux/sched/types.h>
  25
  26 #include <asm/unaligned.h>
  27
  28 #include <acpi/cppc_acpi.h>
  29
  30 /* Minimum struct length needed for the DMI processor entry we want */
  31 #define DMI_ENTRY_PROCESSOR_MIN_LENGTH  48
  32
  33 /* Offset in the DMI processor structure for the max frequency */
  34 #define DMI_PROCESSOR_MAX_SPEED         0x14
  35
  36 /*
  37  * This list contains information parsed from per CPU ACPI _CPC and _PSD
  38  * structures: e.g. the highest and lowest supported performance, capabilities,
  39  * desired performance, level requested etc. Depending on the share_type, not
  40  * all CPUs will have an entry in the list.
  41  */
  42 static LIST_HEAD(cpu_data_list);
  43
  44 static bool boost_supported;
  45
  46 struct cppc_workaround_oem_info {
  47         char oem_id[ACPI_OEM_ID_SIZE + 1];
  48         char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1];
  49         u32 oem_revision;
  50 };
  51
  52 static struct cppc_workaround_oem_info wa_info[] = {
  53         {
  54                 .oem_id         = "HISI  ",
  55                 .oem_table_id   = "HIP07   ",
  56                 .oem_revision   = 0,
  57         }, {
  58                 .oem_id         = "HISI  ",
  59                 .oem_table_id   = "HIP08   ",
  60                 .oem_revision   = 0,
  61         }
  62 };
  63
  64 #ifdef CONFIG_ACPI_CPPC_CPUFREQ_FIE
  65
  66 /* Frequency invariance support */
  67 struct cppc_freq_invariance {
  68         int cpu;
  69         struct irq_work irq_work;
  70         struct kthread_work work;
  71         struct cppc_perf_fb_ctrs prev_perf_fb_ctrs;
  72         struct cppc_cpudata *cpu_data;
  73 };
  74
  75 static DEFINE_PER_CPU(struct cppc_freq_invariance, cppc_freq_inv);
  76 static struct kthread_worker *kworker_fie;
  77 static bool fie_disabled;
  78
  79 static struct cpufreq_driver cppc_cpufreq_driver;
  80 static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpu);
  81 static int cppc_perf_from_fbctrs(struct cppc_cpudata *cpu_data,
  82                                  struct cppc_perf_fb_ctrs fb_ctrs_t0,
  83                                  struct cppc_perf_fb_ctrs fb_ctrs_t1);
  84
  85 /**
  86  * cppc_scale_freq_workfn - CPPC arch_freq_scale updater for frequency invariance
  87  * @work: The work item.
  88  *
  89  * The CPPC driver register itself with the topology core to provide its own
  90  * implementation (cppc_scale_freq_tick()) of topology_scale_freq_tick() which
  91  * gets called by the scheduler on every tick.
  92  *
  93  * Note that the arch specific counters have higher priority than CPPC counters,
  94  * if available, though the CPPC driver doesn't need to have any special
  95  * handling for that.
  96  *
  97  * On an invocation of cppc_scale_freq_tick(), we schedule an irq work (since we
  98  * reach here from hard-irq context), which then schedules a normal work item
  99  * and cppc_scale_freq_workfn() updates the per_cpu arch_freq_scale variable
 100  * based on the counter updates since the last tick.
 101  */
 102 static void cppc_scale_freq_workfn(struct kthread_work *work)
 103 {
 104         struct cppc_freq_invariance *cppc_fi;
 105         struct cppc_perf_fb_ctrs fb_ctrs = {0};
 106         struct cppc_cpudata *cpu_data;
 107         unsigned long local_freq_scale;
 108         u64 perf;
 109
 110         cppc_fi = container_of(work, struct cppc_freq_invariance, work);
 111         cpu_data = cppc_fi->cpu_data;
 112
 113         if (cppc_get_perf_ctrs(cppc_fi->cpu, &fb_ctrs)) {
 114                 pr_warn("%s: failed to read perf counters\n", __func__);
 115                 return;
 116         }
 117
 118         cppc_fi->prev_perf_fb_ctrs = fb_ctrs;
 119         perf = cppc_perf_from_fbctrs(cpu_data, cppc_fi->prev_perf_fb_ctrs,
 120                                      fb_ctrs);
 121
 122         perf <<= SCHED_CAPACITY_SHIFT;
 123         local_freq_scale = div64_u64(perf, cpu_data->perf_caps.highest_perf);
 124         if (WARN_ON(local_freq_scale > 1024))
 125                 local_freq_scale = 1024;
 126
 127         per_cpu(arch_freq_scale, cppc_fi->cpu) = local_freq_scale;
 128 }
 129
 130 static void cppc_irq_work(struct irq_work *irq_work)
 131 {
 132         struct cppc_freq_invariance *cppc_fi;
 133
 134         cppc_fi = container_of(irq_work, struct cppc_freq_invariance, irq_work);
 135         kthread_queue_work(kworker_fie, &cppc_fi->work);
 136 }
 137
 138 static void cppc_scale_freq_tick(void)
 139 {
 140         struct cppc_freq_invariance *cppc_fi = &per_cpu(cppc_freq_inv, smp_processor_id());
 141
 142         /*
 143          * cppc_get_perf_ctrs() can potentially sleep, call that from the right
 144          * context.
 145          */
 146         irq_work_queue(&cppc_fi->irq_work);
 147 }
 148
 149 static struct scale_freq_data cppc_sftd = {
 150         .source = SCALE_FREQ_SOURCE_CPPC,
 151         .set_freq_scale = cppc_scale_freq_tick,
 152 };
 153
 154 static void cppc_freq_invariance_policy_init(struct cpufreq_policy *policy,
 155                                              struct cppc_cpudata *cpu_data)
 156 {
 157         struct cppc_perf_fb_ctrs fb_ctrs = {0};
 158         struct cppc_freq_invariance *cppc_fi;
 159         int i, ret;
 160
 161         if (cppc_cpufreq_driver.get == hisi_cppc_cpufreq_get_rate)
 162                 return;
 163
 164         if (fie_disabled)
 165                 return;
 166
 167         for_each_cpu(i, policy->cpus) {
 168                 cppc_fi = &per_cpu(cppc_freq_inv, i);
 169                 cppc_fi->cpu = i;
 170                 cppc_fi->cpu_data = cpu_data;
 171                 kthread_init_work(&cppc_fi->work, cppc_scale_freq_workfn);
 172                 init_irq_work(&cppc_fi->irq_work, cppc_irq_work);
 173
 174                 ret = cppc_get_perf_ctrs(i, &fb_ctrs);
 175                 if (ret) {
 176                         pr_warn("%s: failed to read perf counters: %d\n",
 177                                 __func__, ret);
 178                         fie_disabled = true;
 179                 } else {
 180                         cppc_fi->prev_perf_fb_ctrs = fb_ctrs;
 181                 }
 182         }
 183 }
 184
 185 static void __init cppc_freq_invariance_init(void)
 186 {
 187         struct sched_attr attr = {
 188                 .size           = sizeof(struct sched_attr),
 189                 .sched_policy   = SCHED_DEADLINE,
 190                 .sched_nice     = 0,
 191                 .sched_priority = 0,
 192                 /*
 193                  * Fake (unused) bandwidth; workaround to "fix"
 194                  * priority inheritance.
 195                  */
 196                 .sched_runtime  = 1000000,
 197                 .sched_deadline = 10000000,
 198                 .sched_period   = 10000000,
 199         };
 200         int ret;
 201
 202         if (cppc_cpufreq_driver.get == hisi_cppc_cpufreq_get_rate)
 203                 return;
 204
 205         if (fie_disabled)
 206                 return;
 207
 208         kworker_fie = kthread_create_worker(0, "cppc_fie");
 209         if (IS_ERR(kworker_fie))
 210                 return;
 211
 212         ret = sched_setattr_nocheck(kworker_fie->task, &attr);
 213         if (ret) {
 214                 pr_warn("%s: failed to set SCHED_DEADLINE: %d\n", __func__,
 215                         ret);
 216                 kthread_destroy_worker(kworker_fie);
 217                 return;
 218         }
 219
 220         /* Register for freq-invariance */
 221         topology_set_scale_freq_source(&cppc_sftd, cpu_present_mask);
 222 }
 223
 224 static void cppc_freq_invariance_exit(void)
 225 {
 226         struct cppc_freq_invariance *cppc_fi;
 227         int i;
 228
 229         if (cppc_cpufreq_driver.get == hisi_cppc_cpufreq_get_rate)
 230                 return;
 231
 232         if (fie_disabled)
 233                 return;
 234
 235         topology_clear_scale_freq_source(SCALE_FREQ_SOURCE_CPPC, cpu_present_mask);
 236
 237         for_each_possible_cpu(i) {
 238                 cppc_fi = &per_cpu(cppc_freq_inv, i);
 239                 irq_work_sync(&cppc_fi->irq_work);
 240         }
 241
 242         kthread_destroy_worker(kworker_fie);
 243         kworker_fie = NULL;
 244 }
 245
 246 #else
 247 static inline void
 248 cppc_freq_invariance_policy_init(struct cpufreq_policy *policy,
 249                                  struct cppc_cpudata *cpu_data)
 250 {
 251 }
 252
 253 static inline void cppc_freq_invariance_init(void)
 254 {
 255 }
 256
 257 static inline void cppc_freq_invariance_exit(void)
 258 {
 259 }
 260 #endif /* CONFIG_ACPI_CPPC_CPUFREQ_FIE */
 261
 262 /* Callback function used to retrieve the max frequency from DMI */
 263 static void cppc_find_dmi_mhz(const struct dmi_header *dm, void *private)
 264 {
 265         const u8 *dmi_data = (const u8 *)dm;
 266         u16 *mhz = (u16 *)private;
 267
 268         if (dm->type == DMI_ENTRY_PROCESSOR &&
 269             dm->length >= DMI_ENTRY_PROCESSOR_MIN_LENGTH) {
 270                 u16 val = (u16)get_unaligned((const u16 *)
 271                                 (dmi_data + DMI_PROCESSOR_MAX_SPEED));
 272                 *mhz = val > *mhz ? val : *mhz;
 273         }
 274 }
 275
 276 /* Look up the max frequency in DMI */
 277 static u64 cppc_get_dmi_max_khz(void)
 278 {
 279         u16 mhz = 0;
 280
 281         dmi_walk(cppc_find_dmi_mhz, &mhz);
 282
 283         /*
 284          * Real stupid fallback value, just in case there is no
 285          * actual value set.
 286          */
 287         mhz = mhz ? mhz : 1;
 288
 289         return (1000 * mhz);
 290 }
 291
 292 /*
 293  * If CPPC lowest_freq and nominal_freq registers are exposed then we can
 294  * use them to convert perf to freq and vice versa
 295  *
 296  * If the perf/freq point lies between Nominal and Lowest, we can treat
 297  * (Low perf, Low freq) and (Nom Perf, Nom freq) as 2D co-ordinates of a line
 298  * and extrapolate the rest
 299  * For perf/freq > Nominal, we use the ratio perf:freq at Nominal for conversion
 300  */
 301 static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu_data,
 302                                              unsigned int perf)
 303 {
 304         struct cppc_perf_caps *caps = &cpu_data->perf_caps;
 305         static u64 max_khz;
 306         u64 mul, div;
 307
 308         if (caps->lowest_freq && caps->nominal_freq) {
 309                 if (perf >= caps->nominal_perf) {
 310                         mul = caps->nominal_freq;
 311                         div = caps->nominal_perf;
 312                 } else {
 313                         mul = caps->nominal_freq - caps->lowest_freq;
 314                         div = caps->nominal_perf - caps->lowest_perf;
 315                 }
 316         } else {
 317                 if (!max_khz)
 318                         max_khz = cppc_get_dmi_max_khz();
 319                 mul = max_khz;
 320                 div = caps->highest_perf;
 321         }
 322         return (u64)perf * mul / div;
 323 }
 324
 325 static unsigned int cppc_cpufreq_khz_to_perf(struct cppc_cpudata *cpu_data,
 326                                              unsigned int freq)
 327 {
 328         struct cppc_perf_caps *caps = &cpu_data->perf_caps;
 329         static u64 max_khz;
 330         u64  mul, div;
 331
 332         if (caps->lowest_freq && caps->nominal_freq) {
 333                 if (freq >= caps->nominal_freq) {
 334                         mul = caps->nominal_perf;
 335                         div = caps->nominal_freq;
 336                 } else {
 337                         mul = caps->lowest_perf;
 338                         div = caps->lowest_freq;
 339                 }
 340         } else {
 341                 if (!max_khz)
 342                         max_khz = cppc_get_dmi_max_khz();
 343                 mul = caps->highest_perf;
 344                 div = max_khz;
 345         }
 346
 347         return (u64)freq * mul / div;
 348 }
 349
 350 static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
 351                                    unsigned int target_freq,
 352                                    unsigned int relation)
 353
 354 {
 355         struct cppc_cpudata *cpu_data = policy->driver_data;
 356         unsigned int cpu = policy->cpu;
 357         struct cpufreq_freqs freqs;
 358         u32 desired_perf;
 359         int ret = 0;
 360
 361         desired_perf = cppc_cpufreq_khz_to_perf(cpu_data, target_freq);
 362         /* Return if it is exactly the same perf */
 363         if (desired_perf == cpu_data->perf_ctrls.desired_perf)
 364                 return ret;
 365
 366         cpu_data->perf_ctrls.desired_perf = desired_perf;
 367         freqs.old = policy->cur;
 368         freqs.new = target_freq;
 369
 370         cpufreq_freq_transition_begin(policy, &freqs);
 371         ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
 372         cpufreq_freq_transition_end(policy, &freqs, ret != 0);
 373
 374         if (ret)
 375                 pr_debug("Failed to set target on CPU:%d. ret:%d\n",
 376                          cpu, ret);
 377
 378         return ret;
 379 }
 380
 381 static int cppc_verify_policy(struct cpufreq_policy_data *policy)
 382 {
 383         cpufreq_verify_within_cpu_limits(policy);
 384         return 0;
 385 }
 386
 387 static void cppc_cpufreq_stop_cpu(struct cpufreq_policy *policy)
 388 {
 389         struct cppc_cpudata *cpu_data = policy->driver_data;
 390         struct cppc_perf_caps *caps = &cpu_data->perf_caps;
 391         unsigned int cpu = policy->cpu;
 392         int ret;
 393
 394         cpu_data->perf_ctrls.desired_perf = caps->lowest_perf;
 395
 396         ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
 397         if (ret)
 398                 pr_debug("Err setting perf value:%d on CPU:%d. ret:%d\n",
 399                          caps->lowest_perf, cpu, ret);
 400
 401         /* Remove CPU node from list and free driver data for policy */
 402         free_cpumask_var(cpu_data->shared_cpu_map);
 403         list_del(&cpu_data->node);
 404         kfree(policy->driver_data);
 405         policy->driver_data = NULL;
 406 }
 407
 408 /*
 409  * The PCC subspace describes the rate at which platform can accept commands
 410  * on the shared PCC channel (including READs which do not count towards freq
 411  * transition requests), so ideally we need to use the PCC values as a fallback
 412  * if we don't have a platform specific transition_delay_us
 413  */
 414 #ifdef CONFIG_ARM64
 415 #include <asm/cputype.h>
 416
 417 static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
 418 {
 419         unsigned long implementor = read_cpuid_implementor();
 420         unsigned long part_num = read_cpuid_part_number();
 421
 422         switch (implementor) {
 423         case ARM_CPU_IMP_QCOM:
 424                 switch (part_num) {
 425                 case QCOM_CPU_PART_FALKOR_V1:
 426                 case QCOM_CPU_PART_FALKOR:
 427                         return 10000;
 428                 }
 429         }
 430         return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
 431 }
 432
 433 #else
 434
 435 static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
 436 {
 437         return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
 438 }
 439 #endif
 440
 441
 442 static struct cppc_cpudata *cppc_cpufreq_get_cpu_data(unsigned int cpu)
 443 {
 444         struct cppc_cpudata *cpu_data;
 445         int ret;
 446
 447         cpu_data = kzalloc(sizeof(struct cppc_cpudata), GFP_KERNEL);
 448         if (!cpu_data)
 449                 goto out;
 450
 451         if (!zalloc_cpumask_var(&cpu_data->shared_cpu_map, GFP_KERNEL))
 452                 goto free_cpu;
 453
 454         ret = acpi_get_psd_map(cpu, cpu_data);
 455         if (ret) {
 456                 pr_debug("Err parsing CPU%d PSD data: ret:%d\n", cpu, ret);
 457                 goto free_mask;
 458         }
 459
 460         ret = cppc_get_perf_caps(cpu, &cpu_data->perf_caps);
 461         if (ret) {
 462                 pr_debug("Err reading CPU%d perf caps: ret:%d\n", cpu, ret);
 463                 goto free_mask;
 464         }
 465
 466         /* Convert the lowest and nominal freq from MHz to KHz */
 467         cpu_data->perf_caps.lowest_freq *= 1000;
 468         cpu_data->perf_caps.nominal_freq *= 1000;
 469
 470         list_add(&cpu_data->node, &cpu_data_list);
 471
 472         return cpu_data;
 473
 474 free_mask:
 475         free_cpumask_var(cpu_data->shared_cpu_map);
 476 free_cpu:
 477         kfree(cpu_data);
 478 out:
 479         return NULL;
 480 }
 481
 482 static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
 483 {
 484         unsigned int cpu = policy->cpu;
 485         struct cppc_cpudata *cpu_data;
 486         struct cppc_perf_caps *caps;
 487         int ret;
 488
 489         cpu_data = cppc_cpufreq_get_cpu_data(cpu);
 490         if (!cpu_data) {
 491                 pr_err("Error in acquiring _CPC/_PSD data for CPU%d.\n", cpu);
 492                 return -ENODEV;
 493         }
 494         caps = &cpu_data->perf_caps;
 495         policy->driver_data = cpu_data;
 496
 497         /*
 498          * Set min to lowest nonlinear perf to avoid any efficiency penalty (see
 499          * Section 8.4.7.1.1.5 of ACPI 6.1 spec)
 500          */
 501         policy->min = cppc_cpufreq_perf_to_khz(cpu_data,
 502                                                caps->lowest_nonlinear_perf);
 503         policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
 504                                                caps->nominal_perf);
 505
 506         /*
 507          * Set cpuinfo.min_freq to Lowest to make the full range of performance
 508          * available if userspace wants to use any perf between lowest & lowest
 509          * nonlinear perf
 510          */
 511         policy->cpuinfo.min_freq = cppc_cpufreq_perf_to_khz(cpu_data,
 512                                                             caps->lowest_perf);
 513         policy->cpuinfo.max_freq = cppc_cpufreq_perf_to_khz(cpu_data,
 514                                                             caps->nominal_perf);
 515
 516         policy->transition_delay_us = cppc_cpufreq_get_transition_delay_us(cpu);
 517         policy->shared_type = cpu_data->shared_type;
 518
 519         switch (policy->shared_type) {
 520         case CPUFREQ_SHARED_TYPE_HW:
 521         case CPUFREQ_SHARED_TYPE_NONE:
 522                 /* Nothing to be done - we'll have a policy for each CPU */
 523                 break;
 524         case CPUFREQ_SHARED_TYPE_ANY:
 525                 /*
 526                  * All CPUs in the domain will share a policy and all cpufreq
 527                  * operations will use a single cppc_cpudata structure stored
 528                  * in policy->driver_data.
 529                  */
 530                 cpumask_copy(policy->cpus, cpu_data->shared_cpu_map);
 531                 break;
 532         default:
 533                 pr_debug("Unsupported CPU co-ord type: %d\n",
 534                          policy->shared_type);
 535                 return -EFAULT;
 536         }
 537
 538         /*
 539          * If 'highest_perf' is greater than 'nominal_perf', we assume CPU Boost
 540          * is supported.
 541          */
 542         if (caps->highest_perf > caps->nominal_perf)
 543                 boost_supported = true;
 544
 545         /* Set policy->cur to max now. The governors will adjust later. */
 546         policy->cur = cppc_cpufreq_perf_to_khz(cpu_data, caps->highest_perf);
 547         cpu_data->perf_ctrls.desired_perf =  caps->highest_perf;
 548
 549         ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
 550         if (ret) {
 551                 pr_debug("Err setting perf value:%d on CPU:%d. ret:%d\n",
 552                          caps->highest_perf, cpu, ret);
 553         } else {
 554                 cppc_freq_invariance_policy_init(policy, cpu_data);
 555         }
 556
 557         return ret;
 558 }
 559
 560 static inline u64 get_delta(u64 t1, u64 t0)
 561 {
 562         if (t1 > t0 || t0 > ~(u32)0)
 563                 return t1 - t0;
 564
 565         return (u32)t1 - (u32)t0;
 566 }
 567
 568 static int cppc_perf_from_fbctrs(struct cppc_cpudata *cpu_data,
 569                                  struct cppc_perf_fb_ctrs fb_ctrs_t0,
 570                                  struct cppc_perf_fb_ctrs fb_ctrs_t1)
 571 {
 572         u64 delta_reference, delta_delivered;
 573         u64 reference_perf;
 574
 575         reference_perf = fb_ctrs_t0.reference_perf;
 576
 577         delta_reference = get_delta(fb_ctrs_t1.reference,
 578                                     fb_ctrs_t0.reference);
 579         delta_delivered = get_delta(fb_ctrs_t1.delivered,
 580                                     fb_ctrs_t0.delivered);
 581
 582         /* Check to avoid divide-by zero and invalid delivered_perf */
 583         if (!delta_reference || !delta_delivered)
 584                 return cpu_data->perf_ctrls.desired_perf;
 585
 586         return (reference_perf * delta_delivered) / delta_reference;
 587 }
 588
 589 static int cppc_get_rate_from_fbctrs(struct cppc_cpudata *cpu_data,
 590                                      struct cppc_perf_fb_ctrs fb_ctrs_t0,
 591                                      struct cppc_perf_fb_ctrs fb_ctrs_t1)
 592 {
 593         u64 delivered_perf;
 594
 595         delivered_perf = cppc_perf_from_fbctrs(cpu_data, fb_ctrs_t0,
 596                                                fb_ctrs_t1);
 597
 598         return cppc_cpufreq_perf_to_khz(cpu_data, delivered_perf);
 599 }
 600
 601 static unsigned int cppc_cpufreq_get_rate(unsigned int cpu)
 602 {
 603         struct cppc_perf_fb_ctrs fb_ctrs_t0 = {0}, fb_ctrs_t1 = {0};
 604         struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
 605         struct cppc_cpudata *cpu_data = policy->driver_data;
 606         int ret;
 607
 608         cpufreq_cpu_put(policy);
 609
 610         ret = cppc_get_perf_ctrs(cpu, &fb_ctrs_t0);
 611         if (ret)
 612                 return ret;
 613
 614         udelay(2); /* 2usec delay between sampling */
 615
 616         ret = cppc_get_perf_ctrs(cpu, &fb_ctrs_t1);
 617         if (ret)
 618                 return ret;
 619
 620         return cppc_get_rate_from_fbctrs(cpu_data, fb_ctrs_t0, fb_ctrs_t1);
 621 }
 622
 623 static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
 624 {
 625         struct cppc_cpudata *cpu_data = policy->driver_data;
 626         struct cppc_perf_caps *caps = &cpu_data->perf_caps;
 627         int ret;
 628
 629         if (!boost_supported) {
 630                 pr_err("BOOST not supported by CPU or firmware\n");
 631                 return -EINVAL;
 632         }
 633
 634         if (state)
 635                 policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
 636                                                        caps->highest_perf);
 637         else
 638                 policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
 639                                                        caps->nominal_perf);
 640         policy->cpuinfo.max_freq = policy->max;
 641
 642         ret = freq_qos_update_request(policy->max_freq_req, policy->max);
 643         if (ret < 0)
 644                 return ret;
 645
 646         return 0;
 647 }
 648
 649 static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
 650 {
 651         struct cppc_cpudata *cpu_data = policy->driver_data;
 652
 653         return cpufreq_show_cpus(cpu_data->shared_cpu_map, buf);
 654 }
 655 cpufreq_freq_attr_ro(freqdomain_cpus);
 656
 657 static struct freq_attr *cppc_cpufreq_attr[] = {
 658         &freqdomain_cpus,
 659         NULL,
 660 };
 661
 662 static struct cpufreq_driver cppc_cpufreq_driver = {
 663         .flags = CPUFREQ_CONST_LOOPS,
 664         .verify = cppc_verify_policy,
 665         .target = cppc_cpufreq_set_target,
 666         .get = cppc_cpufreq_get_rate,
 667         .init = cppc_cpufreq_cpu_init,
 668         .stop_cpu = cppc_cpufreq_stop_cpu,
 669         .set_boost = cppc_cpufreq_set_boost,
 670         .attr = cppc_cpufreq_attr,
 671         .name = "cppc_cpufreq",
 672 };
 673
 674 /*
 675  * HISI platform does not support delivered performance counter and
 676  * reference performance counter. It can calculate the performance using the
 677  * platform specific mechanism. We reuse the desired performance register to
 678  * store the real performance calculated by the platform.
 679  */
 680 static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpu)
 681 {
 682         struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
 683         struct cppc_cpudata *cpu_data = policy->driver_data;
 684         u64 desired_perf;
 685         int ret;
 686
 687         cpufreq_cpu_put(policy);
 688
 689         ret = cppc_get_desired_perf(cpu, &desired_perf);
 690         if (ret < 0)
 691                 return -EIO;
 692
 693         return cppc_cpufreq_perf_to_khz(cpu_data, desired_perf);
 694 }
 695
 696 static void cppc_check_hisi_workaround(void)
 697 {
 698         struct acpi_table_header *tbl;
 699         acpi_status status = AE_OK;
 700         int i;
 701
 702         status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);
 703         if (ACPI_FAILURE(status) || !tbl)
 704                 return;
 705
 706         for (i = 0; i < ARRAY_SIZE(wa_info); i++) {
 707                 if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&
 708                     !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
 709                     wa_info[i].oem_revision == tbl->oem_revision) {
 710                         /* Overwrite the get() callback */
 711                         cppc_cpufreq_driver.get = hisi_cppc_cpufreq_get_rate;
 712                         break;
 713                 }
 714         }
 715
 716         acpi_put_table(tbl);
 717 }
 718
 719 static int __init cppc_cpufreq_init(void)
 720 {
 721         int ret;
 722
 723         if ((acpi_disabled) || !acpi_cpc_valid())
 724                 return -ENODEV;
 725
 726         INIT_LIST_HEAD(&cpu_data_list);
 727
 728         cppc_check_hisi_workaround();
 729
 730         ret = cpufreq_register_driver(&cppc_cpufreq_driver);
 731         if (!ret)
 732                 cppc_freq_invariance_init();
 733
 734         return ret;
 735 }
 736
 737 static inline void free_cpu_data(void)
 738 {
 739         struct cppc_cpudata *iter, *tmp;
 740
 741         list_for_each_entry_safe(iter, tmp, &cpu_data_list, node) {
 742                 free_cpumask_var(iter->shared_cpu_map);
 743                 list_del(&iter->node);
 744                 kfree(iter);
 745         }
 746
 747 }
 748
 749 static void __exit cppc_cpufreq_exit(void)
 750 {
 751         cppc_freq_invariance_exit();
 752         cpufreq_unregister_driver(&cppc_cpufreq_driver);
 753
 754         free_cpu_data();
 755 }
 756
 757 module_exit(cppc_cpufreq_exit);
 758 MODULE_AUTHOR("Ashwin Chaugule");
 759 MODULE_DESCRIPTION("CPUFreq driver based on the ACPI CPPC v5.0+ spec");
 760 MODULE_LICENSE("GPL");
 761
 762 late_initcall(cppc_cpufreq_init);
 763
 764 static const struct acpi_device_id cppc_acpi_ids[] __used = {
 765         {ACPI_PROCESSOR_DEVICE_HID, },
 766         {}
 767 };
 768
 769 MODULE_DEVICE_TABLE(acpi, cppc_acpi_ids);