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