drivers/perf/hisilicon/hisi_uncore_hha_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HiSilicon SoC HHA uncore Hardware event counters support
   4  *
   5  * Copyright (C) 2017 Hisilicon Limited
   6  * Author: Shaokun Zhang <zhangshaokun@hisilicon.com>
   7  *         Anurup M <anurup.m@huawei.com>
   8  *
   9  * This code is based on the uncore PMUs like arm-cci and arm-ccn.
  10  */
  11 #include <linux/acpi.h>
  12 #include <linux/bug.h>
  13 #include <linux/cpuhotplug.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/list.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/smp.h>
  19
  20 #include "hisi_uncore_pmu.h"
  21
  22 /* HHA register definition */
  23 #define HHA_INT_MASK            0x0804
  24 #define HHA_INT_STATUS          0x0808
  25 #define HHA_INT_CLEAR           0x080C
  26 #define HHA_PERF_CTRL           0x1E00
  27 #define HHA_EVENT_CTRL          0x1E04
  28 #define HHA_EVENT_TYPE0         0x1E80
  29 /*
  30  * Each counter is 48-bits and [48:63] are reserved
  31  * which are Read-As-Zero and Writes-Ignored.
  32  */
  33 #define HHA_CNT0_LOWER          0x1F00
  34
  35 /* HHA has 16-counters */
  36 #define HHA_NR_COUNTERS         0x10
  37
  38 #define HHA_PERF_CTRL_EN        0x1
  39 #define HHA_EVTYPE_NONE         0xff
  40
  41 /*
  42  * Select the counter register offset using the counter index
  43  * each counter is 48-bits.
  44  */
  45 static u32 hisi_hha_pmu_get_counter_offset(int cntr_idx)
  46 {
  47         return (HHA_CNT0_LOWER + (cntr_idx * 8));
  48 }
  49
  50 static u64 hisi_hha_pmu_read_counter(struct hisi_pmu *hha_pmu,
  51                                      struct hw_perf_event *hwc)
  52 {
  53         u32 idx = hwc->idx;
  54
  55         if (!hisi_uncore_pmu_counter_valid(hha_pmu, idx)) {
  56                 dev_err(hha_pmu->dev, "Unsupported event index:%d!\n", idx);
  57                 return 0;
  58         }
  59
  60         /* Read 64 bits and like L3C, top 16 bits are RAZ */
  61         return readq(hha_pmu->base + hisi_hha_pmu_get_counter_offset(idx));
  62 }
  63
  64 static void hisi_hha_pmu_write_counter(struct hisi_pmu *hha_pmu,
  65                                        struct hw_perf_event *hwc, u64 val)
  66 {
  67         u32 idx = hwc->idx;
  68
  69         if (!hisi_uncore_pmu_counter_valid(hha_pmu, idx)) {
  70                 dev_err(hha_pmu->dev, "Unsupported event index:%d!\n", idx);
  71                 return;
  72         }
  73
  74         /* Write 64 bits and like L3C, top 16 bits are WI */
  75         writeq(val, hha_pmu->base + hisi_hha_pmu_get_counter_offset(idx));
  76 }
  77
  78 static void hisi_hha_pmu_write_evtype(struct hisi_pmu *hha_pmu, int idx,
  79                                       u32 type)
  80 {
  81         u32 reg, reg_idx, shift, val;
  82
  83         /*
  84          * Select the appropriate event select register(HHA_EVENT_TYPEx).
  85          * There are 4 event select registers for the 16 hardware counters.
  86          * Event code is 8-bits and for the first 4 hardware counters,
  87          * HHA_EVENT_TYPE0 is chosen. For the next 4 hardware counters,
  88          * HHA_EVENT_TYPE1 is chosen and so on.
  89          */
  90         reg = HHA_EVENT_TYPE0 + 4 * (idx / 4);
  91         reg_idx = idx % 4;
  92         shift = 8 * reg_idx;
  93
  94         /* Write event code to HHA_EVENT_TYPEx register */
  95         val = readl(hha_pmu->base + reg);
  96         val &= ~(HHA_EVTYPE_NONE << shift);
  97         val |= (type << shift);
  98         writel(val, hha_pmu->base + reg);
  99 }
 100
 101 static void hisi_hha_pmu_start_counters(struct hisi_pmu *hha_pmu)
 102 {
 103         u32 val;
 104
 105         /*
 106          * Set perf_enable bit in HHA_PERF_CTRL to start event
 107          * counting for all enabled counters.
 108          */
 109         val = readl(hha_pmu->base + HHA_PERF_CTRL);
 110         val |= HHA_PERF_CTRL_EN;
 111         writel(val, hha_pmu->base + HHA_PERF_CTRL);
 112 }
 113
 114 static void hisi_hha_pmu_stop_counters(struct hisi_pmu *hha_pmu)
 115 {
 116         u32 val;
 117
 118         /*
 119          * Clear perf_enable bit in HHA_PERF_CTRL to stop event
 120          * counting for all enabled counters.
 121          */
 122         val = readl(hha_pmu->base + HHA_PERF_CTRL);
 123         val &= ~(HHA_PERF_CTRL_EN);
 124         writel(val, hha_pmu->base + HHA_PERF_CTRL);
 125 }
 126
 127 static void hisi_hha_pmu_enable_counter(struct hisi_pmu *hha_pmu,
 128                                         struct hw_perf_event *hwc)
 129 {
 130         u32 val;
 131
 132         /* Enable counter index in HHA_EVENT_CTRL register */
 133         val = readl(hha_pmu->base + HHA_EVENT_CTRL);
 134         val |= (1 << hwc->idx);
 135         writel(val, hha_pmu->base + HHA_EVENT_CTRL);
 136 }
 137
 138 static void hisi_hha_pmu_disable_counter(struct hisi_pmu *hha_pmu,
 139                                          struct hw_perf_event *hwc)
 140 {
 141         u32 val;
 142
 143         /* Clear counter index in HHA_EVENT_CTRL register */
 144         val = readl(hha_pmu->base + HHA_EVENT_CTRL);
 145         val &= ~(1 << hwc->idx);
 146         writel(val, hha_pmu->base + HHA_EVENT_CTRL);
 147 }
 148
 149 static void hisi_hha_pmu_enable_counter_int(struct hisi_pmu *hha_pmu,
 150                                             struct hw_perf_event *hwc)
 151 {
 152         u32 val;
 153
 154         /* Write 0 to enable interrupt */
 155         val = readl(hha_pmu->base + HHA_INT_MASK);
 156         val &= ~(1 << hwc->idx);
 157         writel(val, hha_pmu->base + HHA_INT_MASK);
 158 }
 159
 160 static void hisi_hha_pmu_disable_counter_int(struct hisi_pmu *hha_pmu,
 161                                              struct hw_perf_event *hwc)
 162 {
 163         u32 val;
 164
 165         /* Write 1 to mask interrupt */
 166         val = readl(hha_pmu->base + HHA_INT_MASK);
 167         val |= (1 << hwc->idx);
 168         writel(val, hha_pmu->base + HHA_INT_MASK);
 169 }
 170
 171 static irqreturn_t hisi_hha_pmu_isr(int irq, void *dev_id)
 172 {
 173         struct hisi_pmu *hha_pmu = dev_id;
 174         struct perf_event *event;
 175         unsigned long overflown;
 176         int idx;
 177
 178         /* Read HHA_INT_STATUS register */
 179         overflown = readl(hha_pmu->base + HHA_INT_STATUS);
 180         if (!overflown)
 181                 return IRQ_NONE;
 182
 183         /*
 184          * Find the counter index which overflowed if the bit was set
 185          * and handle it
 186          */
 187         for_each_set_bit(idx, &overflown, HHA_NR_COUNTERS) {
 188                 /* Write 1 to clear the IRQ status flag */
 189                 writel((1 << idx), hha_pmu->base + HHA_INT_CLEAR);
 190
 191                 /* Get the corresponding event struct */
 192                 event = hha_pmu->pmu_events.hw_events[idx];
 193                 if (!event)
 194                         continue;
 195
 196                 hisi_uncore_pmu_event_update(event);
 197                 hisi_uncore_pmu_set_event_period(event);
 198         }
 199
 200         return IRQ_HANDLED;
 201 }
 202
 203 static int hisi_hha_pmu_init_irq(struct hisi_pmu *hha_pmu,
 204                                  struct platform_device *pdev)
 205 {
 206         int irq, ret;
 207
 208         /* Read and init IRQ */
 209         irq = platform_get_irq(pdev, 0);
 210         if (irq < 0)
 211                 return irq;
 212
 213         ret = devm_request_irq(&pdev->dev, irq, hisi_hha_pmu_isr,
 214                               IRQF_NOBALANCING | IRQF_NO_THREAD,
 215                               dev_name(&pdev->dev), hha_pmu);
 216         if (ret < 0) {
 217                 dev_err(&pdev->dev,
 218                         "Fail to request IRQ:%d ret:%d\n", irq, ret);
 219                 return ret;
 220         }
 221
 222         hha_pmu->irq = irq;
 223
 224         return 0;
 225 }
 226
 227 static const struct acpi_device_id hisi_hha_pmu_acpi_match[] = {
 228         { "HISI0243", },
 229         {},
 230 };
 231 MODULE_DEVICE_TABLE(acpi, hisi_hha_pmu_acpi_match);
 232
 233 static int hisi_hha_pmu_init_data(struct platform_device *pdev,
 234                                   struct hisi_pmu *hha_pmu)
 235 {
 236         unsigned long long id;
 237         acpi_status status;
 238
 239         status = acpi_evaluate_integer(ACPI_HANDLE(&pdev->dev),
 240                                        "_UID", NULL, &id);
 241         if (ACPI_FAILURE(status))
 242                 return -EINVAL;
 243
 244         hha_pmu->index_id = id;
 245
 246         /*
 247          * Use SCCL_ID and UID to identify the HHA PMU, while
 248          * SCCL_ID is in MPIDR[aff2].
 249          */
 250         if (device_property_read_u32(&pdev->dev, "hisilicon,scl-id",
 251                                      &hha_pmu->sccl_id)) {
 252                 dev_err(&pdev->dev, "Can not read hha sccl-id!\n");
 253                 return -EINVAL;
 254         }
 255         /* HHA PMUs only share the same SCCL */
 256         hha_pmu->ccl_id = -1;
 257
 258         hha_pmu->base = devm_platform_ioremap_resource(pdev, 0);
 259         if (IS_ERR(hha_pmu->base)) {
 260                 dev_err(&pdev->dev, "ioremap failed for hha_pmu resource\n");
 261                 return PTR_ERR(hha_pmu->base);
 262         }
 263
 264         return 0;
 265 }
 266
 267 static struct attribute *hisi_hha_pmu_format_attr[] = {
 268         HISI_PMU_FORMAT_ATTR(event, "config:0-7"),
 269         NULL,
 270 };
 271
 272 static const struct attribute_group hisi_hha_pmu_format_group = {
 273         .name = "format",
 274         .attrs = hisi_hha_pmu_format_attr,
 275 };
 276
 277 static struct attribute *hisi_hha_pmu_events_attr[] = {
 278         HISI_PMU_EVENT_ATTR(rx_ops_num,         0x00),
 279         HISI_PMU_EVENT_ATTR(rx_outer,           0x01),
 280         HISI_PMU_EVENT_ATTR(rx_sccl,            0x02),
 281         HISI_PMU_EVENT_ATTR(rx_ccix,            0x03),
 282         HISI_PMU_EVENT_ATTR(rx_wbi,             0x04),
 283         HISI_PMU_EVENT_ATTR(rx_wbip,            0x05),
 284         HISI_PMU_EVENT_ATTR(rx_wtistash,        0x11),
 285         HISI_PMU_EVENT_ATTR(rd_ddr_64b,         0x1c),
 286         HISI_PMU_EVENT_ATTR(wr_ddr_64b,         0x1d),
 287         HISI_PMU_EVENT_ATTR(rd_ddr_128b,        0x1e),
 288         HISI_PMU_EVENT_ATTR(wr_ddr_128b,        0x1f),
 289         HISI_PMU_EVENT_ATTR(spill_num,          0x20),
 290         HISI_PMU_EVENT_ATTR(spill_success,      0x21),
 291         HISI_PMU_EVENT_ATTR(bi_num,             0x23),
 292         HISI_PMU_EVENT_ATTR(mediated_num,       0x32),
 293         HISI_PMU_EVENT_ATTR(tx_snp_num,         0x33),
 294         HISI_PMU_EVENT_ATTR(tx_snp_outer,       0x34),
 295         HISI_PMU_EVENT_ATTR(tx_snp_ccix,        0x35),
 296         HISI_PMU_EVENT_ATTR(rx_snprspdata,      0x38),
 297         HISI_PMU_EVENT_ATTR(rx_snprsp_outer,    0x3c),
 298         HISI_PMU_EVENT_ATTR(sdir-lookup,        0x40),
 299         HISI_PMU_EVENT_ATTR(edir-lookup,        0x41),
 300         HISI_PMU_EVENT_ATTR(sdir-hit,           0x42),
 301         HISI_PMU_EVENT_ATTR(edir-hit,           0x43),
 302         HISI_PMU_EVENT_ATTR(sdir-home-migrate,  0x4c),
 303         HISI_PMU_EVENT_ATTR(edir-home-migrate,  0x4d),
 304         NULL,
 305 };
 306
 307 static const struct attribute_group hisi_hha_pmu_events_group = {
 308         .name = "events",
 309         .attrs = hisi_hha_pmu_events_attr,
 310 };
 311
 312 static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
 313
 314 static struct attribute *hisi_hha_pmu_cpumask_attrs[] = {
 315         &dev_attr_cpumask.attr,
 316         NULL,
 317 };
 318
 319 static const struct attribute_group hisi_hha_pmu_cpumask_attr_group = {
 320         .attrs = hisi_hha_pmu_cpumask_attrs,
 321 };
 322
 323 static const struct attribute_group *hisi_hha_pmu_attr_groups[] = {
 324         &hisi_hha_pmu_format_group,
 325         &hisi_hha_pmu_events_group,
 326         &hisi_hha_pmu_cpumask_attr_group,
 327         NULL,
 328 };
 329
 330 static const struct hisi_uncore_ops hisi_uncore_hha_ops = {
 331         .write_evtype           = hisi_hha_pmu_write_evtype,
 332         .get_event_idx          = hisi_uncore_pmu_get_event_idx,
 333         .start_counters         = hisi_hha_pmu_start_counters,
 334         .stop_counters          = hisi_hha_pmu_stop_counters,
 335         .enable_counter         = hisi_hha_pmu_enable_counter,
 336         .disable_counter        = hisi_hha_pmu_disable_counter,
 337         .enable_counter_int     = hisi_hha_pmu_enable_counter_int,
 338         .disable_counter_int    = hisi_hha_pmu_disable_counter_int,
 339         .write_counter          = hisi_hha_pmu_write_counter,
 340         .read_counter           = hisi_hha_pmu_read_counter,
 341 };
 342
 343 static int hisi_hha_pmu_dev_probe(struct platform_device *pdev,
 344                                   struct hisi_pmu *hha_pmu)
 345 {
 346         int ret;
 347
 348         ret = hisi_hha_pmu_init_data(pdev, hha_pmu);
 349         if (ret)
 350                 return ret;
 351
 352         ret = hisi_hha_pmu_init_irq(hha_pmu, pdev);
 353         if (ret)
 354                 return ret;
 355
 356         hha_pmu->num_counters = HHA_NR_COUNTERS;
 357         hha_pmu->counter_bits = 48;
 358         hha_pmu->ops = &hisi_uncore_hha_ops;
 359         hha_pmu->dev = &pdev->dev;
 360         hha_pmu->on_cpu = -1;
 361         hha_pmu->check_event = 0x65;
 362
 363         return 0;
 364 }
 365
 366 static int hisi_hha_pmu_probe(struct platform_device *pdev)
 367 {
 368         struct hisi_pmu *hha_pmu;
 369         char *name;
 370         int ret;
 371
 372         hha_pmu = devm_kzalloc(&pdev->dev, sizeof(*hha_pmu), GFP_KERNEL);
 373         if (!hha_pmu)
 374                 return -ENOMEM;
 375
 376         platform_set_drvdata(pdev, hha_pmu);
 377
 378         ret = hisi_hha_pmu_dev_probe(pdev, hha_pmu);
 379         if (ret)
 380                 return ret;
 381
 382         ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
 383                                        &hha_pmu->node);
 384         if (ret) {
 385                 dev_err(&pdev->dev, "Error %d registering hotplug\n", ret);
 386                 return ret;
 387         }
 388
 389         name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "hisi_sccl%u_hha%u",
 390                               hha_pmu->sccl_id, hha_pmu->index_id);
 391         hha_pmu->pmu = (struct pmu) {
 392                 .name           = name,
 393                 .task_ctx_nr    = perf_invalid_context,
 394                 .event_init     = hisi_uncore_pmu_event_init,
 395                 .pmu_enable     = hisi_uncore_pmu_enable,
 396                 .pmu_disable    = hisi_uncore_pmu_disable,
 397                 .add            = hisi_uncore_pmu_add,
 398                 .del            = hisi_uncore_pmu_del,
 399                 .start          = hisi_uncore_pmu_start,
 400                 .stop           = hisi_uncore_pmu_stop,
 401                 .read           = hisi_uncore_pmu_read,
 402                 .attr_groups    = hisi_hha_pmu_attr_groups,
 403                 .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
 404         };
 405
 406         ret = perf_pmu_register(&hha_pmu->pmu, name, -1);
 407         if (ret) {
 408                 dev_err(hha_pmu->dev, "HHA PMU register failed!\n");
 409                 cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
 410                                             &hha_pmu->node);
 411         }
 412
 413         return ret;
 414 }
 415
 416 static int hisi_hha_pmu_remove(struct platform_device *pdev)
 417 {
 418         struct hisi_pmu *hha_pmu = platform_get_drvdata(pdev);
 419
 420         perf_pmu_unregister(&hha_pmu->pmu);
 421         cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
 422                                     &hha_pmu->node);
 423
 424         return 0;
 425 }
 426
 427 static struct platform_driver hisi_hha_pmu_driver = {
 428         .driver = {
 429                 .name = "hisi_hha_pmu",
 430                 .acpi_match_table = ACPI_PTR(hisi_hha_pmu_acpi_match),
 431         },
 432         .probe = hisi_hha_pmu_probe,
 433         .remove = hisi_hha_pmu_remove,
 434 };
 435
 436 static int __init hisi_hha_pmu_module_init(void)
 437 {
 438         int ret;
 439
 440         ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
 441                                       "AP_PERF_ARM_HISI_HHA_ONLINE",
 442                                       hisi_uncore_pmu_online_cpu,
 443                                       hisi_uncore_pmu_offline_cpu);
 444         if (ret) {
 445                 pr_err("HHA PMU: Error setup hotplug, ret = %d;\n", ret);
 446                 return ret;
 447         }
 448
 449         ret = platform_driver_register(&hisi_hha_pmu_driver);
 450         if (ret)
 451                 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE);
 452
 453         return ret;
 454 }
 455 module_init(hisi_hha_pmu_module_init);
 456
 457 static void __exit hisi_hha_pmu_module_exit(void)
 458 {
 459         platform_driver_unregister(&hisi_hha_pmu_driver);
 460         cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE);
 461 }
 462 module_exit(hisi_hha_pmu_module_exit);
 463
 464 MODULE_DESCRIPTION("HiSilicon SoC HHA uncore PMU driver");
 465 MODULE_LICENSE("GPL v2");
 466 MODULE_AUTHOR("Shaokun Zhang <zhangshaokun@hisilicon.com>");
 467 MODULE_AUTHOR("Anurup M <anurup.m@huawei.com>");