drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c

   1 /*
   2  * HiSilicon SoC DDRC uncore Hardware event counters support
   3  *
   4  * Copyright (C) 2017 Hisilicon Limited
   5  * Author: Shaokun Zhang <zhangshaokun@hisilicon.com>
   6  *         Anurup M <anurup.m@huawei.com>
   7  *
   8  * This code is based on the uncore PMUs like arm-cci and arm-ccn.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/acpi.h>
  15 #include <linux/bug.h>
  16 #include <linux/cpuhotplug.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/irq.h>
  19 #include <linux/list.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/smp.h>
  22
  23 #include "hisi_uncore_pmu.h"
  24
  25 /* DDRC register definition */
  26 #define DDRC_PERF_CTRL          0x010
  27 #define DDRC_FLUX_WR            0x380
  28 #define DDRC_FLUX_RD            0x384
  29 #define DDRC_FLUX_WCMD          0x388
  30 #define DDRC_FLUX_RCMD          0x38c
  31 #define DDRC_PRE_CMD            0x3c0
  32 #define DDRC_ACT_CMD            0x3c4
  33 #define DDRC_RNK_CHG            0x3cc
  34 #define DDRC_RW_CHG             0x3d0
  35 #define DDRC_EVENT_CTRL         0x6C0
  36 #define DDRC_INT_MASK           0x6c8
  37 #define DDRC_INT_STATUS         0x6cc
  38 #define DDRC_INT_CLEAR          0x6d0
  39
  40 /* DDRC has 8-counters */
  41 #define DDRC_NR_COUNTERS        0x8
  42 #define DDRC_PERF_CTRL_EN       0x2
  43
  44 /*
  45  * For DDRC PMU, there are eight-events and every event has been mapped
  46  * to fixed-purpose counters which register offset is not consistent.
  47  * Therefore there is no write event type and we assume that event
  48  * code (0 to 7) is equal to counter index in PMU driver.
  49  */
  50 #define GET_DDRC_EVENTID(hwc)   (hwc->config_base & 0x7)
  51
  52 static const u32 ddrc_reg_off[] = {
  53         DDRC_FLUX_WR, DDRC_FLUX_RD, DDRC_FLUX_WCMD, DDRC_FLUX_RCMD,
  54         DDRC_PRE_CMD, DDRC_ACT_CMD, DDRC_RNK_CHG, DDRC_RW_CHG
  55 };
  56
  57 /*
  58  * Select the counter register offset using the counter index.
  59  * In DDRC there are no programmable counter, the count
  60  * is readed form the statistics counter register itself.
  61  */
  62 static u32 hisi_ddrc_pmu_get_counter_offset(int cntr_idx)
  63 {
  64         return ddrc_reg_off[cntr_idx];
  65 }
  66
  67 static u64 hisi_ddrc_pmu_read_counter(struct hisi_pmu *ddrc_pmu,
  68                                       struct hw_perf_event *hwc)
  69 {
  70         /* Use event code as counter index */
  71         u32 idx = GET_DDRC_EVENTID(hwc);
  72
  73         if (!hisi_uncore_pmu_counter_valid(ddrc_pmu, idx)) {
  74                 dev_err(ddrc_pmu->dev, "Unsupported event index:%d!\n", idx);
  75                 return 0;
  76         }
  77
  78         return readl(ddrc_pmu->base + hisi_ddrc_pmu_get_counter_offset(idx));
  79 }
  80
  81 static void hisi_ddrc_pmu_write_counter(struct hisi_pmu *ddrc_pmu,
  82                                         struct hw_perf_event *hwc, u64 val)
  83 {
  84         u32 idx = GET_DDRC_EVENTID(hwc);
  85
  86         if (!hisi_uncore_pmu_counter_valid(ddrc_pmu, idx)) {
  87                 dev_err(ddrc_pmu->dev, "Unsupported event index:%d!\n", idx);
  88                 return;
  89         }
  90
  91         writel((u32)val,
  92                ddrc_pmu->base + hisi_ddrc_pmu_get_counter_offset(idx));
  93 }
  94
  95 /*
  96  * For DDRC PMU, event has been mapped to fixed-purpose counter by hardware,
  97  * so there is no need to write event type.
  98  */
  99 static void hisi_ddrc_pmu_write_evtype(struct hisi_pmu *hha_pmu, int idx,
 100                                        u32 type)
 101 {
 102 }
 103
 104 static void hisi_ddrc_pmu_start_counters(struct hisi_pmu *ddrc_pmu)
 105 {
 106         u32 val;
 107
 108         /* Set perf_enable in DDRC_PERF_CTRL to start event counting */
 109         val = readl(ddrc_pmu->base + DDRC_PERF_CTRL);
 110         val |= DDRC_PERF_CTRL_EN;
 111         writel(val, ddrc_pmu->base + DDRC_PERF_CTRL);
 112 }
 113
 114 static void hisi_ddrc_pmu_stop_counters(struct hisi_pmu *ddrc_pmu)
 115 {
 116         u32 val;
 117
 118         /* Clear perf_enable in DDRC_PERF_CTRL to stop event counting */
 119         val = readl(ddrc_pmu->base + DDRC_PERF_CTRL);
 120         val &= ~DDRC_PERF_CTRL_EN;
 121         writel(val, ddrc_pmu->base + DDRC_PERF_CTRL);
 122 }
 123
 124 static void hisi_ddrc_pmu_enable_counter(struct hisi_pmu *ddrc_pmu,
 125                                          struct hw_perf_event *hwc)
 126 {
 127         u32 val;
 128
 129         /* Set counter index(event code) in DDRC_EVENT_CTRL register */
 130         val = readl(ddrc_pmu->base + DDRC_EVENT_CTRL);
 131         val |= (1 << GET_DDRC_EVENTID(hwc));
 132         writel(val, ddrc_pmu->base + DDRC_EVENT_CTRL);
 133 }
 134
 135 static void hisi_ddrc_pmu_disable_counter(struct hisi_pmu *ddrc_pmu,
 136                                           struct hw_perf_event *hwc)
 137 {
 138         u32 val;
 139
 140         /* Clear counter index(event code) in DDRC_EVENT_CTRL register */
 141         val = readl(ddrc_pmu->base + DDRC_EVENT_CTRL);
 142         val &= ~(1 << GET_DDRC_EVENTID(hwc));
 143         writel(val, ddrc_pmu->base + DDRC_EVENT_CTRL);
 144 }
 145
 146 static int hisi_ddrc_pmu_get_event_idx(struct perf_event *event)
 147 {
 148         struct hisi_pmu *ddrc_pmu = to_hisi_pmu(event->pmu);
 149         unsigned long *used_mask = ddrc_pmu->pmu_events.used_mask;
 150         struct hw_perf_event *hwc = &event->hw;
 151         /* For DDRC PMU, we use event code as counter index */
 152         int idx = GET_DDRC_EVENTID(hwc);
 153
 154         if (test_bit(idx, used_mask))
 155                 return -EAGAIN;
 156
 157         set_bit(idx, used_mask);
 158
 159         return idx;
 160 }
 161
 162 static void hisi_ddrc_pmu_enable_counter_int(struct hisi_pmu *ddrc_pmu,
 163                                              struct hw_perf_event *hwc)
 164 {
 165         u32 val;
 166
 167         /* Write 0 to enable interrupt */
 168         val = readl(ddrc_pmu->base + DDRC_INT_MASK);
 169         val &= ~(1 << GET_DDRC_EVENTID(hwc));
 170         writel(val, ddrc_pmu->base + DDRC_INT_MASK);
 171 }
 172
 173 static void hisi_ddrc_pmu_disable_counter_int(struct hisi_pmu *ddrc_pmu,
 174                                               struct hw_perf_event *hwc)
 175 {
 176         u32 val;
 177
 178         /* Write 1 to mask interrupt */
 179         val = readl(ddrc_pmu->base + DDRC_INT_MASK);
 180         val |= (1 << GET_DDRC_EVENTID(hwc));
 181         writel(val, ddrc_pmu->base + DDRC_INT_MASK);
 182 }
 183
 184 static irqreturn_t hisi_ddrc_pmu_isr(int irq, void *dev_id)
 185 {
 186         struct hisi_pmu *ddrc_pmu = dev_id;
 187         struct perf_event *event;
 188         unsigned long overflown;
 189         int idx;
 190
 191         /* Read the DDRC_INT_STATUS register */
 192         overflown = readl(ddrc_pmu->base + DDRC_INT_STATUS);
 193         if (!overflown)
 194                 return IRQ_NONE;
 195
 196         /*
 197          * Find the counter index which overflowed if the bit was set
 198          * and handle it
 199          */
 200         for_each_set_bit(idx, &overflown, DDRC_NR_COUNTERS) {
 201                 /* Write 1 to clear the IRQ status flag */
 202                 writel((1 << idx), ddrc_pmu->base + DDRC_INT_CLEAR);
 203
 204                 /* Get the corresponding event struct */
 205                 event = ddrc_pmu->pmu_events.hw_events[idx];
 206                 if (!event)
 207                         continue;
 208
 209                 hisi_uncore_pmu_event_update(event);
 210                 hisi_uncore_pmu_set_event_period(event);
 211         }
 212
 213         return IRQ_HANDLED;
 214 }
 215
 216 static int hisi_ddrc_pmu_init_irq(struct hisi_pmu *ddrc_pmu,
 217                                   struct platform_device *pdev)
 218 {
 219         int irq, ret;
 220
 221         /* Read and init IRQ */
 222         irq = platform_get_irq(pdev, 0);
 223         if (irq < 0) {
 224                 dev_err(&pdev->dev, "DDRC PMU get irq fail; irq:%d\n", irq);
 225                 return irq;
 226         }
 227
 228         ret = devm_request_irq(&pdev->dev, irq, hisi_ddrc_pmu_isr,
 229                                IRQF_NOBALANCING | IRQF_NO_THREAD,
 230                                dev_name(&pdev->dev), ddrc_pmu);
 231         if (ret < 0) {
 232                 dev_err(&pdev->dev,
 233                         "Fail to request IRQ:%d ret:%d\n", irq, ret);
 234                 return ret;
 235         }
 236
 237         ddrc_pmu->irq = irq;
 238
 239         return 0;
 240 }
 241
 242 static const struct acpi_device_id hisi_ddrc_pmu_acpi_match[] = {
 243         { "HISI0233", },
 244         {},
 245 };
 246 MODULE_DEVICE_TABLE(acpi, hisi_ddrc_pmu_acpi_match);
 247
 248 static int hisi_ddrc_pmu_init_data(struct platform_device *pdev,
 249                                    struct hisi_pmu *ddrc_pmu)
 250 {
 251         struct resource *res;
 252
 253         /*
 254          * Use the SCCL_ID and DDRC channel ID to identify the
 255          * DDRC PMU, while SCCL_ID is in MPIDR[aff2].
 256          */
 257         if (device_property_read_u32(&pdev->dev, "hisilicon,ch-id",
 258                                      &ddrc_pmu->index_id)) {
 259                 dev_err(&pdev->dev, "Can not read ddrc channel-id!\n");
 260                 return -EINVAL;
 261         }
 262
 263         if (device_property_read_u32(&pdev->dev, "hisilicon,scl-id",
 264                                      &ddrc_pmu->sccl_id)) {
 265                 dev_err(&pdev->dev, "Can not read ddrc sccl-id!\n");
 266                 return -EINVAL;
 267         }
 268         /* DDRC PMUs only share the same SCCL */
 269         ddrc_pmu->ccl_id = -1;
 270
 271         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 272         ddrc_pmu->base = devm_ioremap_resource(&pdev->dev, res);
 273         if (IS_ERR(ddrc_pmu->base)) {
 274                 dev_err(&pdev->dev, "ioremap failed for ddrc_pmu resource\n");
 275                 return PTR_ERR(ddrc_pmu->base);
 276         }
 277
 278         return 0;
 279 }
 280
 281 static struct attribute *hisi_ddrc_pmu_format_attr[] = {
 282         HISI_PMU_FORMAT_ATTR(event, "config:0-4"),
 283         NULL,
 284 };
 285
 286 static const struct attribute_group hisi_ddrc_pmu_format_group = {
 287         .name = "format",
 288         .attrs = hisi_ddrc_pmu_format_attr,
 289 };
 290
 291 static struct attribute *hisi_ddrc_pmu_events_attr[] = {
 292         HISI_PMU_EVENT_ATTR(flux_wr,            0x00),
 293         HISI_PMU_EVENT_ATTR(flux_rd,            0x01),
 294         HISI_PMU_EVENT_ATTR(flux_wcmd,          0x02),
 295         HISI_PMU_EVENT_ATTR(flux_rcmd,          0x03),
 296         HISI_PMU_EVENT_ATTR(pre_cmd,            0x04),
 297         HISI_PMU_EVENT_ATTR(act_cmd,            0x05),
 298         HISI_PMU_EVENT_ATTR(rnk_chg,            0x06),
 299         HISI_PMU_EVENT_ATTR(rw_chg,             0x07),
 300         NULL,
 301 };
 302
 303 static const struct attribute_group hisi_ddrc_pmu_events_group = {
 304         .name = "events",
 305         .attrs = hisi_ddrc_pmu_events_attr,
 306 };
 307
 308 static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
 309
 310 static struct attribute *hisi_ddrc_pmu_cpumask_attrs[] = {
 311         &dev_attr_cpumask.attr,
 312         NULL,
 313 };
 314
 315 static const struct attribute_group hisi_ddrc_pmu_cpumask_attr_group = {
 316         .attrs = hisi_ddrc_pmu_cpumask_attrs,
 317 };
 318
 319 static const struct attribute_group *hisi_ddrc_pmu_attr_groups[] = {
 320         &hisi_ddrc_pmu_format_group,
 321         &hisi_ddrc_pmu_events_group,
 322         &hisi_ddrc_pmu_cpumask_attr_group,
 323         NULL,
 324 };
 325
 326 static const struct hisi_uncore_ops hisi_uncore_ddrc_ops = {
 327         .write_evtype           = hisi_ddrc_pmu_write_evtype,
 328         .get_event_idx          = hisi_ddrc_pmu_get_event_idx,
 329         .start_counters         = hisi_ddrc_pmu_start_counters,
 330         .stop_counters          = hisi_ddrc_pmu_stop_counters,
 331         .enable_counter         = hisi_ddrc_pmu_enable_counter,
 332         .disable_counter        = hisi_ddrc_pmu_disable_counter,
 333         .enable_counter_int     = hisi_ddrc_pmu_enable_counter_int,
 334         .disable_counter_int    = hisi_ddrc_pmu_disable_counter_int,
 335         .write_counter          = hisi_ddrc_pmu_write_counter,
 336         .read_counter           = hisi_ddrc_pmu_read_counter,
 337 };
 338
 339 static int hisi_ddrc_pmu_dev_probe(struct platform_device *pdev,
 340                                    struct hisi_pmu *ddrc_pmu)
 341 {
 342         int ret;
 343
 344         ret = hisi_ddrc_pmu_init_data(pdev, ddrc_pmu);
 345         if (ret)
 346                 return ret;
 347
 348         ret = hisi_ddrc_pmu_init_irq(ddrc_pmu, pdev);
 349         if (ret)
 350                 return ret;
 351
 352         ddrc_pmu->num_counters = DDRC_NR_COUNTERS;
 353         ddrc_pmu->counter_bits = 32;
 354         ddrc_pmu->ops = &hisi_uncore_ddrc_ops;
 355         ddrc_pmu->dev = &pdev->dev;
 356         ddrc_pmu->on_cpu = -1;
 357         ddrc_pmu->check_event = 7;
 358
 359         return 0;
 360 }
 361
 362 static int hisi_ddrc_pmu_probe(struct platform_device *pdev)
 363 {
 364         struct hisi_pmu *ddrc_pmu;
 365         char *name;
 366         int ret;
 367
 368         ddrc_pmu = devm_kzalloc(&pdev->dev, sizeof(*ddrc_pmu), GFP_KERNEL);
 369         if (!ddrc_pmu)
 370                 return -ENOMEM;
 371
 372         platform_set_drvdata(pdev, ddrc_pmu);
 373
 374         ret = hisi_ddrc_pmu_dev_probe(pdev, ddrc_pmu);
 375         if (ret)
 376                 return ret;
 377
 378         ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
 379                                        &ddrc_pmu->node);
 380         if (ret) {
 381                 dev_err(&pdev->dev, "Error %d registering hotplug;\n", ret);
 382                 return ret;
 383         }
 384
 385         name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "hisi_sccl%u_ddrc%u",
 386                               ddrc_pmu->sccl_id, ddrc_pmu->index_id);
 387         ddrc_pmu->pmu = (struct pmu) {
 388                 .name           = name,
 389                 .task_ctx_nr    = perf_invalid_context,
 390                 .event_init     = hisi_uncore_pmu_event_init,
 391                 .pmu_enable     = hisi_uncore_pmu_enable,
 392                 .pmu_disable    = hisi_uncore_pmu_disable,
 393                 .add            = hisi_uncore_pmu_add,
 394                 .del            = hisi_uncore_pmu_del,
 395                 .start          = hisi_uncore_pmu_start,
 396                 .stop           = hisi_uncore_pmu_stop,
 397                 .read           = hisi_uncore_pmu_read,
 398                 .attr_groups    = hisi_ddrc_pmu_attr_groups,
 399         };
 400
 401         ret = perf_pmu_register(&ddrc_pmu->pmu, name, -1);
 402         if (ret) {
 403                 dev_err(ddrc_pmu->dev, "DDRC PMU register failed!\n");
 404                 cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
 405                                             &ddrc_pmu->node);
 406         }
 407
 408         return ret;
 409 }
 410
 411 static int hisi_ddrc_pmu_remove(struct platform_device *pdev)
 412 {
 413         struct hisi_pmu *ddrc_pmu = platform_get_drvdata(pdev);
 414
 415         perf_pmu_unregister(&ddrc_pmu->pmu);
 416         cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
 417                                     &ddrc_pmu->node);
 418
 419         return 0;
 420 }
 421
 422 static struct platform_driver hisi_ddrc_pmu_driver = {
 423         .driver = {
 424                 .name = "hisi_ddrc_pmu",
 425                 .acpi_match_table = ACPI_PTR(hisi_ddrc_pmu_acpi_match),
 426         },
 427         .probe = hisi_ddrc_pmu_probe,
 428         .remove = hisi_ddrc_pmu_remove,
 429 };
 430
 431 static int __init hisi_ddrc_pmu_module_init(void)
 432 {
 433         int ret;
 434
 435         ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
 436                                       "AP_PERF_ARM_HISI_DDRC_ONLINE",
 437                                       hisi_uncore_pmu_online_cpu,
 438                                       hisi_uncore_pmu_offline_cpu);
 439         if (ret) {
 440                 pr_err("DDRC PMU: setup hotplug, ret = %d\n", ret);
 441                 return ret;
 442         }
 443
 444         ret = platform_driver_register(&hisi_ddrc_pmu_driver);
 445         if (ret)
 446                 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE);
 447
 448         return ret;
 449 }
 450 module_init(hisi_ddrc_pmu_module_init);
 451
 452 static void __exit hisi_ddrc_pmu_module_exit(void)
 453 {
 454         platform_driver_unregister(&hisi_ddrc_pmu_driver);
 455         cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE);
 456
 457 }
 458 module_exit(hisi_ddrc_pmu_module_exit);
 459
 460 MODULE_DESCRIPTION("HiSilicon SoC DDRC uncore PMU driver");
 461 MODULE_LICENSE("GPL v2");
 462 MODULE_AUTHOR("Shaokun Zhang <zhangshaokun@hisilicon.com>");
 463 MODULE_AUTHOR("Anurup M <anurup.m@huawei.com>");