drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HiSilicon SoC DDRC 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 /* DDRC register definition */
  23 #define DDRC_PERF_CTRL          0x010
  24 #define DDRC_FLUX_WR            0x380
  25 #define DDRC_FLUX_RD            0x384
  26 #define DDRC_FLUX_WCMD          0x388
  27 #define DDRC_FLUX_RCMD          0x38c
  28 #define DDRC_PRE_CMD            0x3c0
  29 #define DDRC_ACT_CMD            0x3c4
  30 #define DDRC_RNK_CHG            0x3cc
  31 #define DDRC_RW_CHG             0x3d0
  32 #define DDRC_EVENT_CTRL         0x6C0
  33 #define DDRC_INT_MASK           0x6c8
  34 #define DDRC_INT_STATUS         0x6cc
  35 #define DDRC_INT_CLEAR          0x6d0
  36 #define DDRC_VERSION            0x710
  37
  38 /* DDRC has 8-counters */
  39 #define DDRC_NR_COUNTERS        0x8
  40 #define DDRC_PERF_CTRL_EN       0x2
  41
  42 /*
  43  * For DDRC PMU, there are eight-events and every event has been mapped
  44  * to fixed-purpose counters which register offset is not consistent.
  45  * Therefore there is no write event type and we assume that event
  46  * code (0 to 7) is equal to counter index in PMU driver.
  47  */
  48 #define GET_DDRC_EVENTID(hwc)   (hwc->config_base & 0x7)
  49
  50 static const u32 ddrc_reg_off[] = {
  51         DDRC_FLUX_WR, DDRC_FLUX_RD, DDRC_FLUX_WCMD, DDRC_FLUX_RCMD,
  52         DDRC_PRE_CMD, DDRC_ACT_CMD, DDRC_RNK_CHG, DDRC_RW_CHG
  53 };
  54
  55 /*
  56  * Select the counter register offset using the counter index.
  57  * In DDRC there are no programmable counter, the count
  58  * is readed form the statistics counter register itself.
  59  */
  60 static u32 hisi_ddrc_pmu_get_counter_offset(int cntr_idx)
  61 {
  62         return ddrc_reg_off[cntr_idx];
  63 }
  64
  65 static u64 hisi_ddrc_pmu_read_counter(struct hisi_pmu *ddrc_pmu,
  66                                       struct hw_perf_event *hwc)
  67 {
  68         /* Use event code as counter index */
  69         u32 idx = GET_DDRC_EVENTID(hwc);
  70
  71         if (!hisi_uncore_pmu_counter_valid(ddrc_pmu, idx)) {
  72                 dev_err(ddrc_pmu->dev, "Unsupported event index:%d!\n", idx);
  73                 return 0;
  74         }
  75
  76         return readl(ddrc_pmu->base + hisi_ddrc_pmu_get_counter_offset(idx));
  77 }
  78
  79 static void hisi_ddrc_pmu_write_counter(struct hisi_pmu *ddrc_pmu,
  80                                         struct hw_perf_event *hwc, u64 val)
  81 {
  82         u32 idx = GET_DDRC_EVENTID(hwc);
  83
  84         if (!hisi_uncore_pmu_counter_valid(ddrc_pmu, idx)) {
  85                 dev_err(ddrc_pmu->dev, "Unsupported event index:%d!\n", idx);
  86                 return;
  87         }
  88
  89         writel((u32)val,
  90                ddrc_pmu->base + hisi_ddrc_pmu_get_counter_offset(idx));
  91 }
  92
  93 /*
  94  * For DDRC PMU, event has been mapped to fixed-purpose counter by hardware,
  95  * so there is no need to write event type.
  96  */
  97 static void hisi_ddrc_pmu_write_evtype(struct hisi_pmu *hha_pmu, int idx,
  98                                        u32 type)
  99 {
 100 }
 101
 102 static void hisi_ddrc_pmu_start_counters(struct hisi_pmu *ddrc_pmu)
 103 {
 104         u32 val;
 105
 106         /* Set perf_enable in DDRC_PERF_CTRL to start event counting */
 107         val = readl(ddrc_pmu->base + DDRC_PERF_CTRL);
 108         val |= DDRC_PERF_CTRL_EN;
 109         writel(val, ddrc_pmu->base + DDRC_PERF_CTRL);
 110 }
 111
 112 static void hisi_ddrc_pmu_stop_counters(struct hisi_pmu *ddrc_pmu)
 113 {
 114         u32 val;
 115
 116         /* Clear perf_enable in DDRC_PERF_CTRL to stop event counting */
 117         val = readl(ddrc_pmu->base + DDRC_PERF_CTRL);
 118         val &= ~DDRC_PERF_CTRL_EN;
 119         writel(val, ddrc_pmu->base + DDRC_PERF_CTRL);
 120 }
 121
 122 static void hisi_ddrc_pmu_enable_counter(struct hisi_pmu *ddrc_pmu,
 123                                          struct hw_perf_event *hwc)
 124 {
 125         u32 val;
 126
 127         /* Set counter index(event code) in DDRC_EVENT_CTRL register */
 128         val = readl(ddrc_pmu->base + DDRC_EVENT_CTRL);
 129         val |= (1 << GET_DDRC_EVENTID(hwc));
 130         writel(val, ddrc_pmu->base + DDRC_EVENT_CTRL);
 131 }
 132
 133 static void hisi_ddrc_pmu_disable_counter(struct hisi_pmu *ddrc_pmu,
 134                                           struct hw_perf_event *hwc)
 135 {
 136         u32 val;
 137
 138         /* Clear counter index(event code) in DDRC_EVENT_CTRL register */
 139         val = readl(ddrc_pmu->base + DDRC_EVENT_CTRL);
 140         val &= ~(1 << GET_DDRC_EVENTID(hwc));
 141         writel(val, ddrc_pmu->base + DDRC_EVENT_CTRL);
 142 }
 143
 144 static int hisi_ddrc_pmu_get_event_idx(struct perf_event *event)
 145 {
 146         struct hisi_pmu *ddrc_pmu = to_hisi_pmu(event->pmu);
 147         unsigned long *used_mask = ddrc_pmu->pmu_events.used_mask;
 148         struct hw_perf_event *hwc = &event->hw;
 149         /* For DDRC PMU, we use event code as counter index */
 150         int idx = GET_DDRC_EVENTID(hwc);
 151
 152         if (test_bit(idx, used_mask))
 153                 return -EAGAIN;
 154
 155         set_bit(idx, used_mask);
 156
 157         return idx;
 158 }
 159
 160 static void hisi_ddrc_pmu_enable_counter_int(struct hisi_pmu *ddrc_pmu,
 161                                              struct hw_perf_event *hwc)
 162 {
 163         u32 val;
 164
 165         /* Write 0 to enable interrupt */
 166         val = readl(ddrc_pmu->base + DDRC_INT_MASK);
 167         val &= ~(1 << GET_DDRC_EVENTID(hwc));
 168         writel(val, ddrc_pmu->base + DDRC_INT_MASK);
 169 }
 170
 171 static void hisi_ddrc_pmu_disable_counter_int(struct hisi_pmu *ddrc_pmu,
 172                                               struct hw_perf_event *hwc)
 173 {
 174         u32 val;
 175
 176         /* Write 1 to mask interrupt */
 177         val = readl(ddrc_pmu->base + DDRC_INT_MASK);
 178         val |= (1 << GET_DDRC_EVENTID(hwc));
 179         writel(val, ddrc_pmu->base + DDRC_INT_MASK);
 180 }
 181
 182 static irqreturn_t hisi_ddrc_pmu_isr(int irq, void *dev_id)
 183 {
 184         struct hisi_pmu *ddrc_pmu = dev_id;
 185         struct perf_event *event;
 186         unsigned long overflown;
 187         int idx;
 188
 189         /* Read the DDRC_INT_STATUS register */
 190         overflown = readl(ddrc_pmu->base + DDRC_INT_STATUS);
 191         if (!overflown)
 192                 return IRQ_NONE;
 193
 194         /*
 195          * Find the counter index which overflowed if the bit was set
 196          * and handle it
 197          */
 198         for_each_set_bit(idx, &overflown, DDRC_NR_COUNTERS) {
 199                 /* Write 1 to clear the IRQ status flag */
 200                 writel((1 << idx), ddrc_pmu->base + DDRC_INT_CLEAR);
 201
 202                 /* Get the corresponding event struct */
 203                 event = ddrc_pmu->pmu_events.hw_events[idx];
 204                 if (!event)
 205                         continue;
 206
 207                 hisi_uncore_pmu_event_update(event);
 208                 hisi_uncore_pmu_set_event_period(event);
 209         }
 210
 211         return IRQ_HANDLED;
 212 }
 213
 214 static int hisi_ddrc_pmu_init_irq(struct hisi_pmu *ddrc_pmu,
 215                                   struct platform_device *pdev)
 216 {
 217         int irq, ret;
 218
 219         /* Read and init IRQ */
 220         irq = platform_get_irq(pdev, 0);
 221         if (irq < 0)
 222                 return irq;
 223
 224         ret = devm_request_irq(&pdev->dev, irq, hisi_ddrc_pmu_isr,
 225                                IRQF_NOBALANCING | IRQF_NO_THREAD,
 226                                dev_name(&pdev->dev), ddrc_pmu);
 227         if (ret < 0) {
 228                 dev_err(&pdev->dev,
 229                         "Fail to request IRQ:%d ret:%d\n", irq, ret);
 230                 return ret;
 231         }
 232
 233         ddrc_pmu->irq = irq;
 234
 235         return 0;
 236 }
 237
 238 static const struct acpi_device_id hisi_ddrc_pmu_acpi_match[] = {
 239         { "HISI0233", },
 240         {},
 241 };
 242 MODULE_DEVICE_TABLE(acpi, hisi_ddrc_pmu_acpi_match);
 243
 244 static int hisi_ddrc_pmu_init_data(struct platform_device *pdev,
 245                                    struct hisi_pmu *ddrc_pmu)
 246 {
 247         /*
 248          * Use the SCCL_ID and DDRC channel ID to identify the
 249          * DDRC PMU, while SCCL_ID is in MPIDR[aff2].
 250          */
 251         if (device_property_read_u32(&pdev->dev, "hisilicon,ch-id",
 252                                      &ddrc_pmu->index_id)) {
 253                 dev_err(&pdev->dev, "Can not read ddrc channel-id!\n");
 254                 return -EINVAL;
 255         }
 256
 257         if (device_property_read_u32(&pdev->dev, "hisilicon,scl-id",
 258                                      &ddrc_pmu->sccl_id)) {
 259                 dev_err(&pdev->dev, "Can not read ddrc sccl-id!\n");
 260                 return -EINVAL;
 261         }
 262         /* DDRC PMUs only share the same SCCL */
 263         ddrc_pmu->ccl_id = -1;
 264
 265         ddrc_pmu->base = devm_platform_ioremap_resource(pdev, 0);
 266         if (IS_ERR(ddrc_pmu->base)) {
 267                 dev_err(&pdev->dev, "ioremap failed for ddrc_pmu resource\n");
 268                 return PTR_ERR(ddrc_pmu->base);
 269         }
 270
 271         ddrc_pmu->identifier = readl(ddrc_pmu->base + DDRC_VERSION);
 272
 273         return 0;
 274 }
 275
 276 static struct attribute *hisi_ddrc_pmu_format_attr[] = {
 277         HISI_PMU_FORMAT_ATTR(event, "config:0-4"),
 278         NULL,
 279 };
 280
 281 static const struct attribute_group hisi_ddrc_pmu_format_group = {
 282         .name = "format",
 283         .attrs = hisi_ddrc_pmu_format_attr,
 284 };
 285
 286 static struct attribute *hisi_ddrc_pmu_events_attr[] = {
 287         HISI_PMU_EVENT_ATTR(flux_wr,            0x00),
 288         HISI_PMU_EVENT_ATTR(flux_rd,            0x01),
 289         HISI_PMU_EVENT_ATTR(flux_wcmd,          0x02),
 290         HISI_PMU_EVENT_ATTR(flux_rcmd,          0x03),
 291         HISI_PMU_EVENT_ATTR(pre_cmd,            0x04),
 292         HISI_PMU_EVENT_ATTR(act_cmd,            0x05),
 293         HISI_PMU_EVENT_ATTR(rnk_chg,            0x06),
 294         HISI_PMU_EVENT_ATTR(rw_chg,             0x07),
 295         NULL,
 296 };
 297
 298 static const struct attribute_group hisi_ddrc_pmu_events_group = {
 299         .name = "events",
 300         .attrs = hisi_ddrc_pmu_events_attr,
 301 };
 302
 303 static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
 304
 305 static struct attribute *hisi_ddrc_pmu_cpumask_attrs[] = {
 306         &dev_attr_cpumask.attr,
 307         NULL,
 308 };
 309
 310 static const struct attribute_group hisi_ddrc_pmu_cpumask_attr_group = {
 311         .attrs = hisi_ddrc_pmu_cpumask_attrs,
 312 };
 313
 314 static struct device_attribute hisi_ddrc_pmu_identifier_attr =
 315         __ATTR(identifier, 0444, hisi_uncore_pmu_identifier_attr_show, NULL);
 316
 317 static struct attribute *hisi_ddrc_pmu_identifier_attrs[] = {
 318         &hisi_ddrc_pmu_identifier_attr.attr,
 319         NULL
 320 };
 321
 322 static struct attribute_group hisi_ddrc_pmu_identifier_group = {
 323         .attrs = hisi_ddrc_pmu_identifier_attrs,
 324 };
 325
 326 static const struct attribute_group *hisi_ddrc_pmu_attr_groups[] = {
 327         &hisi_ddrc_pmu_format_group,
 328         &hisi_ddrc_pmu_events_group,
 329         &hisi_ddrc_pmu_cpumask_attr_group,
 330         &hisi_ddrc_pmu_identifier_group,
 331         NULL,
 332 };
 333
 334 static const struct hisi_uncore_ops hisi_uncore_ddrc_ops = {
 335         .write_evtype           = hisi_ddrc_pmu_write_evtype,
 336         .get_event_idx          = hisi_ddrc_pmu_get_event_idx,
 337         .start_counters         = hisi_ddrc_pmu_start_counters,
 338         .stop_counters          = hisi_ddrc_pmu_stop_counters,
 339         .enable_counter         = hisi_ddrc_pmu_enable_counter,
 340         .disable_counter        = hisi_ddrc_pmu_disable_counter,
 341         .enable_counter_int     = hisi_ddrc_pmu_enable_counter_int,
 342         .disable_counter_int    = hisi_ddrc_pmu_disable_counter_int,
 343         .write_counter          = hisi_ddrc_pmu_write_counter,
 344         .read_counter           = hisi_ddrc_pmu_read_counter,
 345 };
 346
 347 static int hisi_ddrc_pmu_dev_probe(struct platform_device *pdev,
 348                                    struct hisi_pmu *ddrc_pmu)
 349 {
 350         int ret;
 351
 352         ret = hisi_ddrc_pmu_init_data(pdev, ddrc_pmu);
 353         if (ret)
 354                 return ret;
 355
 356         ret = hisi_ddrc_pmu_init_irq(ddrc_pmu, pdev);
 357         if (ret)
 358                 return ret;
 359
 360         ddrc_pmu->num_counters = DDRC_NR_COUNTERS;
 361         ddrc_pmu->counter_bits = 32;
 362         ddrc_pmu->ops = &hisi_uncore_ddrc_ops;
 363         ddrc_pmu->dev = &pdev->dev;
 364         ddrc_pmu->on_cpu = -1;
 365         ddrc_pmu->check_event = 7;
 366
 367         return 0;
 368 }
 369
 370 static int hisi_ddrc_pmu_probe(struct platform_device *pdev)
 371 {
 372         struct hisi_pmu *ddrc_pmu;
 373         char *name;
 374         int ret;
 375
 376         ddrc_pmu = devm_kzalloc(&pdev->dev, sizeof(*ddrc_pmu), GFP_KERNEL);
 377         if (!ddrc_pmu)
 378                 return -ENOMEM;
 379
 380         platform_set_drvdata(pdev, ddrc_pmu);
 381
 382         ret = hisi_ddrc_pmu_dev_probe(pdev, ddrc_pmu);
 383         if (ret)
 384                 return ret;
 385
 386         ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
 387                                        &ddrc_pmu->node);
 388         if (ret) {
 389                 dev_err(&pdev->dev, "Error %d registering hotplug;\n", ret);
 390                 return ret;
 391         }
 392
 393         name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "hisi_sccl%u_ddrc%u",
 394                               ddrc_pmu->sccl_id, ddrc_pmu->index_id);
 395         ddrc_pmu->pmu = (struct pmu) {
 396                 .name           = name,
 397                 .module         = THIS_MODULE,
 398                 .task_ctx_nr    = perf_invalid_context,
 399                 .event_init     = hisi_uncore_pmu_event_init,
 400                 .pmu_enable     = hisi_uncore_pmu_enable,
 401                 .pmu_disable    = hisi_uncore_pmu_disable,
 402                 .add            = hisi_uncore_pmu_add,
 403                 .del            = hisi_uncore_pmu_del,
 404                 .start          = hisi_uncore_pmu_start,
 405                 .stop           = hisi_uncore_pmu_stop,
 406                 .read           = hisi_uncore_pmu_read,
 407                 .attr_groups    = hisi_ddrc_pmu_attr_groups,
 408                 .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
 409         };
 410
 411         ret = perf_pmu_register(&ddrc_pmu->pmu, name, -1);
 412         if (ret) {
 413                 dev_err(ddrc_pmu->dev, "DDRC PMU register failed!\n");
 414                 cpuhp_state_remove_instance_nocalls(
 415                         CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, &ddrc_pmu->node);
 416                 irq_set_affinity_hint(ddrc_pmu->irq, NULL);
 417         }
 418
 419         return ret;
 420 }
 421
 422 static int hisi_ddrc_pmu_remove(struct platform_device *pdev)
 423 {
 424         struct hisi_pmu *ddrc_pmu = platform_get_drvdata(pdev);
 425
 426         perf_pmu_unregister(&ddrc_pmu->pmu);
 427         cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
 428                                             &ddrc_pmu->node);
 429         irq_set_affinity_hint(ddrc_pmu->irq, NULL);
 430
 431         return 0;
 432 }
 433
 434 static struct platform_driver hisi_ddrc_pmu_driver = {
 435         .driver = {
 436                 .name = "hisi_ddrc_pmu",
 437                 .acpi_match_table = ACPI_PTR(hisi_ddrc_pmu_acpi_match),
 438                 .suppress_bind_attrs = true,
 439         },
 440         .probe = hisi_ddrc_pmu_probe,
 441         .remove = hisi_ddrc_pmu_remove,
 442 };
 443
 444 static int __init hisi_ddrc_pmu_module_init(void)
 445 {
 446         int ret;
 447
 448         ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
 449                                       "AP_PERF_ARM_HISI_DDRC_ONLINE",
 450                                       hisi_uncore_pmu_online_cpu,
 451                                       hisi_uncore_pmu_offline_cpu);
 452         if (ret) {
 453                 pr_err("DDRC PMU: setup hotplug, ret = %d\n", ret);
 454                 return ret;
 455         }
 456
 457         ret = platform_driver_register(&hisi_ddrc_pmu_driver);
 458         if (ret)
 459                 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE);
 460
 461         return ret;
 462 }
 463 module_init(hisi_ddrc_pmu_module_init);
 464
 465 static void __exit hisi_ddrc_pmu_module_exit(void)
 466 {
 467         platform_driver_unregister(&hisi_ddrc_pmu_driver);
 468         cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE);
 469
 470 }
 471 module_exit(hisi_ddrc_pmu_module_exit);
 472
 473 MODULE_DESCRIPTION("HiSilicon SoC DDRC uncore PMU driver");
 474 MODULE_LICENSE("GPL v2");
 475 MODULE_AUTHOR("Shaokun Zhang <zhangshaokun@hisilicon.com>");
 476 MODULE_AUTHOR("Anurup M <anurup.m@huawei.com>");