drivers/perf/hisilicon/hisi_uncore_cpa_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HiSilicon SoC CPA(Coherency Protocol Agent) hardware event counters support
   4  *
   5  * Copyright (C) 2022 HiSilicon Limited
   6  * Author: Qi Liu <liuqi115@huawei.com>
   7  *
   8  * This code is based on the uncore PMUs like arm-cci and arm-ccn.
   9  */
  10
  11 #define pr_fmt(fmt) "cpa pmu: " fmt
  12 #include <linux/acpi.h>
  13 #include <linux/bug.h>
  14 #include <linux/cpuhotplug.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/irq.h>
  17 #include <linux/list.h>
  18 #include <linux/smp.h>
  19
  20 #include "hisi_uncore_pmu.h"
  21
  22 /* CPA register definition */
  23 #define CPA_PERF_CTRL           0x1c00
  24 #define CPA_EVENT_CTRL          0x1c04
  25 #define CPA_INT_MASK            0x1c70
  26 #define CPA_INT_STATUS          0x1c78
  27 #define CPA_INT_CLEAR           0x1c7c
  28 #define CPA_EVENT_TYPE0         0x1c80
  29 #define CPA_VERSION             0x1cf0
  30 #define CPA_CNT0_LOWER          0x1d00
  31 #define CPA_CFG_REG             0x0534
  32
  33 /* CPA operation command */
  34 #define CPA_PERF_CTRL_EN        BIT_ULL(0)
  35 #define CPA_EVTYPE_MASK         0xffUL
  36 #define CPA_PM_CTRL             BIT_ULL(9)
  37
  38 /* CPA has 8-counters */
  39 #define CPA_NR_COUNTERS         0x8
  40 #define CPA_COUNTER_BITS        64
  41 #define CPA_NR_EVENTS           0xff
  42 #define CPA_REG_OFFSET          0x8
  43
  44 static u32 hisi_cpa_pmu_get_counter_offset(int idx)
  45 {
  46         return (CPA_CNT0_LOWER + idx * CPA_REG_OFFSET);
  47 }
  48
  49 static u64 hisi_cpa_pmu_read_counter(struct hisi_pmu *cpa_pmu,
  50                                      struct hw_perf_event *hwc)
  51 {
  52         return readq(cpa_pmu->base + hisi_cpa_pmu_get_counter_offset(hwc->idx));
  53 }
  54
  55 static void hisi_cpa_pmu_write_counter(struct hisi_pmu *cpa_pmu,
  56                                        struct hw_perf_event *hwc, u64 val)
  57 {
  58         writeq(val, cpa_pmu->base + hisi_cpa_pmu_get_counter_offset(hwc->idx));
  59 }
  60
  61 static void hisi_cpa_pmu_write_evtype(struct hisi_pmu *cpa_pmu, int idx,
  62                                       u32 type)
  63 {
  64         u32 reg, reg_idx, shift, val;
  65
  66         /*
  67          * Select the appropriate event select register(CPA_EVENT_TYPE0/1).
  68          * There are 2 event select registers for the 8 hardware counters.
  69          * Event code is 8-bits and for the former 4 hardware counters,
  70          * CPA_EVENT_TYPE0 is chosen. For the latter 4 hardware counters,
  71          * CPA_EVENT_TYPE1 is chosen.
  72          */
  73         reg = CPA_EVENT_TYPE0 + (idx / 4) * 4;
  74         reg_idx = idx % 4;
  75         shift = CPA_REG_OFFSET * reg_idx;
  76
  77         /* Write event code to CPA_EVENT_TYPEx Register */
  78         val = readl(cpa_pmu->base + reg);
  79         val &= ~(CPA_EVTYPE_MASK << shift);
  80         val |= type << shift;
  81         writel(val, cpa_pmu->base + reg);
  82 }
  83
  84 static void hisi_cpa_pmu_start_counters(struct hisi_pmu *cpa_pmu)
  85 {
  86         u32 val;
  87
  88         val = readl(cpa_pmu->base + CPA_PERF_CTRL);
  89         val |= CPA_PERF_CTRL_EN;
  90         writel(val, cpa_pmu->base + CPA_PERF_CTRL);
  91 }
  92
  93 static void hisi_cpa_pmu_stop_counters(struct hisi_pmu *cpa_pmu)
  94 {
  95         u32 val;
  96
  97         val = readl(cpa_pmu->base + CPA_PERF_CTRL);
  98         val &= ~(CPA_PERF_CTRL_EN);
  99         writel(val, cpa_pmu->base + CPA_PERF_CTRL);
 100 }
 101
 102 static void hisi_cpa_pmu_disable_pm(struct hisi_pmu *cpa_pmu)
 103 {
 104         u32 val;
 105
 106         val = readl(cpa_pmu->base + CPA_CFG_REG);
 107         val |= CPA_PM_CTRL;
 108         writel(val, cpa_pmu->base + CPA_CFG_REG);
 109 }
 110
 111 static void hisi_cpa_pmu_enable_pm(struct hisi_pmu *cpa_pmu)
 112 {
 113         u32 val;
 114
 115         val = readl(cpa_pmu->base + CPA_CFG_REG);
 116         val &= ~(CPA_PM_CTRL);
 117         writel(val, cpa_pmu->base + CPA_CFG_REG);
 118 }
 119
 120 static void hisi_cpa_pmu_enable_counter(struct hisi_pmu *cpa_pmu,
 121                                         struct hw_perf_event *hwc)
 122 {
 123         u32 val;
 124
 125         /* Enable counter index in CPA_EVENT_CTRL register */
 126         val = readl(cpa_pmu->base + CPA_EVENT_CTRL);
 127         val |= 1 << hwc->idx;
 128         writel(val, cpa_pmu->base + CPA_EVENT_CTRL);
 129 }
 130
 131 static void hisi_cpa_pmu_disable_counter(struct hisi_pmu *cpa_pmu,
 132                                          struct hw_perf_event *hwc)
 133 {
 134         u32 val;
 135
 136         /* Clear counter index in CPA_EVENT_CTRL register */
 137         val = readl(cpa_pmu->base + CPA_EVENT_CTRL);
 138         val &= ~(1UL << hwc->idx);
 139         writel(val, cpa_pmu->base + CPA_EVENT_CTRL);
 140 }
 141
 142 static void hisi_cpa_pmu_enable_counter_int(struct hisi_pmu *cpa_pmu,
 143                                             struct hw_perf_event *hwc)
 144 {
 145         u32 val;
 146
 147         /* Write 0 to enable interrupt */
 148         val = readl(cpa_pmu->base + CPA_INT_MASK);
 149         val &= ~(1UL << hwc->idx);
 150         writel(val, cpa_pmu->base + CPA_INT_MASK);
 151 }
 152
 153 static void hisi_cpa_pmu_disable_counter_int(struct hisi_pmu *cpa_pmu,
 154                                              struct hw_perf_event *hwc)
 155 {
 156         u32 val;
 157
 158         /* Write 1 to mask interrupt */
 159         val = readl(cpa_pmu->base + CPA_INT_MASK);
 160         val |= 1 << hwc->idx;
 161         writel(val, cpa_pmu->base + CPA_INT_MASK);
 162 }
 163
 164 static u32 hisi_cpa_pmu_get_int_status(struct hisi_pmu *cpa_pmu)
 165 {
 166         return readl(cpa_pmu->base + CPA_INT_STATUS);
 167 }
 168
 169 static void hisi_cpa_pmu_clear_int_status(struct hisi_pmu *cpa_pmu, int idx)
 170 {
 171         writel(1 << idx, cpa_pmu->base + CPA_INT_CLEAR);
 172 }
 173
 174 static const struct acpi_device_id hisi_cpa_pmu_acpi_match[] = {
 175         { "HISI0281", },
 176         {}
 177 };
 178 MODULE_DEVICE_TABLE(acpi, hisi_cpa_pmu_acpi_match);
 179
 180 static int hisi_cpa_pmu_init_data(struct platform_device *pdev,
 181                                   struct hisi_pmu *cpa_pmu)
 182 {
 183         if (device_property_read_u32(&pdev->dev, "hisilicon,scl-id",
 184                                      &cpa_pmu->sicl_id)) {
 185                 dev_err(&pdev->dev, "Can not read sicl-id\n");
 186                 return -EINVAL;
 187         }
 188
 189         if (device_property_read_u32(&pdev->dev, "hisilicon,idx-id",
 190                                      &cpa_pmu->index_id)) {
 191                 dev_err(&pdev->dev, "Cannot read idx-id\n");
 192                 return -EINVAL;
 193         }
 194
 195         cpa_pmu->ccl_id = -1;
 196         cpa_pmu->sccl_id = -1;
 197         cpa_pmu->base = devm_platform_ioremap_resource(pdev, 0);
 198         if (IS_ERR(cpa_pmu->base))
 199                 return PTR_ERR(cpa_pmu->base);
 200
 201         cpa_pmu->identifier = readl(cpa_pmu->base + CPA_VERSION);
 202
 203         return 0;
 204 }
 205
 206 static struct attribute *hisi_cpa_pmu_format_attr[] = {
 207         HISI_PMU_FORMAT_ATTR(event, "config:0-15"),
 208         NULL
 209 };
 210
 211 static const struct attribute_group hisi_cpa_pmu_format_group = {
 212         .name = "format",
 213         .attrs = hisi_cpa_pmu_format_attr,
 214 };
 215
 216 static struct attribute *hisi_cpa_pmu_events_attr[] = {
 217         HISI_PMU_EVENT_ATTR(cpa_cycles,         0x00),
 218         HISI_PMU_EVENT_ATTR(cpa_p1_wr_dat,      0x61),
 219         HISI_PMU_EVENT_ATTR(cpa_p1_rd_dat,      0x62),
 220         HISI_PMU_EVENT_ATTR(cpa_p0_wr_dat,      0xE1),
 221         HISI_PMU_EVENT_ATTR(cpa_p0_rd_dat,      0xE2),
 222         NULL
 223 };
 224
 225 static const struct attribute_group hisi_cpa_pmu_events_group = {
 226         .name = "events",
 227         .attrs = hisi_cpa_pmu_events_attr,
 228 };
 229
 230 static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);
 231
 232 static struct attribute *hisi_cpa_pmu_cpumask_attrs[] = {
 233         &dev_attr_cpumask.attr,
 234         NULL
 235 };
 236
 237 static const struct attribute_group hisi_cpa_pmu_cpumask_attr_group = {
 238         .attrs = hisi_cpa_pmu_cpumask_attrs,
 239 };
 240
 241 static struct device_attribute hisi_cpa_pmu_identifier_attr =
 242         __ATTR(identifier, 0444, hisi_uncore_pmu_identifier_attr_show, NULL);
 243
 244 static struct attribute *hisi_cpa_pmu_identifier_attrs[] = {
 245         &hisi_cpa_pmu_identifier_attr.attr,
 246         NULL
 247 };
 248
 249 static const struct attribute_group hisi_cpa_pmu_identifier_group = {
 250         .attrs = hisi_cpa_pmu_identifier_attrs,
 251 };
 252
 253 static const struct attribute_group *hisi_cpa_pmu_attr_groups[] = {
 254         &hisi_cpa_pmu_format_group,
 255         &hisi_cpa_pmu_events_group,
 256         &hisi_cpa_pmu_cpumask_attr_group,
 257         &hisi_cpa_pmu_identifier_group,
 258         NULL
 259 };
 260
 261 static const struct hisi_uncore_ops hisi_uncore_cpa_pmu_ops = {
 262         .write_evtype           = hisi_cpa_pmu_write_evtype,
 263         .get_event_idx          = hisi_uncore_pmu_get_event_idx,
 264         .start_counters         = hisi_cpa_pmu_start_counters,
 265         .stop_counters          = hisi_cpa_pmu_stop_counters,
 266         .enable_counter         = hisi_cpa_pmu_enable_counter,
 267         .disable_counter        = hisi_cpa_pmu_disable_counter,
 268         .enable_counter_int     = hisi_cpa_pmu_enable_counter_int,
 269         .disable_counter_int    = hisi_cpa_pmu_disable_counter_int,
 270         .write_counter          = hisi_cpa_pmu_write_counter,
 271         .read_counter           = hisi_cpa_pmu_read_counter,
 272         .get_int_status         = hisi_cpa_pmu_get_int_status,
 273         .clear_int_status       = hisi_cpa_pmu_clear_int_status,
 274 };
 275
 276 static int hisi_cpa_pmu_dev_probe(struct platform_device *pdev,
 277                                   struct hisi_pmu *cpa_pmu)
 278 {
 279         int ret;
 280
 281         ret = hisi_cpa_pmu_init_data(pdev, cpa_pmu);
 282         if (ret)
 283                 return ret;
 284
 285         ret = hisi_uncore_pmu_init_irq(cpa_pmu, pdev);
 286         if (ret)
 287                 return ret;
 288
 289         cpa_pmu->counter_bits = CPA_COUNTER_BITS;
 290         cpa_pmu->check_event = CPA_NR_EVENTS;
 291         cpa_pmu->pmu_events.attr_groups = hisi_cpa_pmu_attr_groups;
 292         cpa_pmu->ops = &hisi_uncore_cpa_pmu_ops;
 293         cpa_pmu->num_counters = CPA_NR_COUNTERS;
 294         cpa_pmu->dev = &pdev->dev;
 295         cpa_pmu->on_cpu = -1;
 296
 297         return 0;
 298 }
 299
 300 static int hisi_cpa_pmu_probe(struct platform_device *pdev)
 301 {
 302         struct hisi_pmu *cpa_pmu;
 303         char *name;
 304         int ret;
 305
 306         cpa_pmu = devm_kzalloc(&pdev->dev, sizeof(*cpa_pmu), GFP_KERNEL);
 307         if (!cpa_pmu)
 308                 return -ENOMEM;
 309
 310         ret = hisi_cpa_pmu_dev_probe(pdev, cpa_pmu);
 311         if (ret)
 312                 return ret;
 313
 314         name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "hisi_sicl%d_cpa%u",
 315                               cpa_pmu->sicl_id, cpa_pmu->index_id);
 316         if (!name)
 317                 return -ENOMEM;
 318
 319         hisi_pmu_init(cpa_pmu, THIS_MODULE);
 320
 321         /* Power Management should be disabled before using CPA PMU. */
 322         hisi_cpa_pmu_disable_pm(cpa_pmu);
 323         ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
 324                                        &cpa_pmu->node);
 325         if (ret) {
 326                 dev_err(&pdev->dev, "Error %d registering hotplug\n", ret);
 327                 hisi_cpa_pmu_enable_pm(cpa_pmu);
 328                 return ret;
 329         }
 330
 331         ret = perf_pmu_register(&cpa_pmu->pmu, name, -1);
 332         if (ret) {
 333                 dev_err(cpa_pmu->dev, "PMU register failed\n");
 334                 cpuhp_state_remove_instance_nocalls(
 335                         CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE, &cpa_pmu->node);
 336                 hisi_cpa_pmu_enable_pm(cpa_pmu);
 337                 return ret;
 338         }
 339
 340         platform_set_drvdata(pdev, cpa_pmu);
 341         return ret;
 342 }
 343
 344 static void hisi_cpa_pmu_remove(struct platform_device *pdev)
 345 {
 346         struct hisi_pmu *cpa_pmu = platform_get_drvdata(pdev);
 347
 348         perf_pmu_unregister(&cpa_pmu->pmu);
 349         cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
 350                                             &cpa_pmu->node);
 351         hisi_cpa_pmu_enable_pm(cpa_pmu);
 352 }
 353
 354 static struct platform_driver hisi_cpa_pmu_driver = {
 355         .driver = {
 356                 .name = "hisi_cpa_pmu",
 357                 .acpi_match_table = ACPI_PTR(hisi_cpa_pmu_acpi_match),
 358                 .suppress_bind_attrs = true,
 359         },
 360         .probe = hisi_cpa_pmu_probe,
 361         .remove = hisi_cpa_pmu_remove,
 362 };
 363
 364 static int __init hisi_cpa_pmu_module_init(void)
 365 {
 366         int ret;
 367
 368         ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE,
 369                                       "AP_PERF_ARM_HISI_CPA_ONLINE",
 370                                       hisi_uncore_pmu_online_cpu,
 371                                       hisi_uncore_pmu_offline_cpu);
 372         if (ret) {
 373                 pr_err("setup hotplug failed: %d\n", ret);
 374                 return ret;
 375         }
 376
 377         ret = platform_driver_register(&hisi_cpa_pmu_driver);
 378         if (ret)
 379                 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE);
 380
 381         return ret;
 382 }
 383 module_init(hisi_cpa_pmu_module_init);
 384
 385 static void __exit hisi_cpa_pmu_module_exit(void)
 386 {
 387         platform_driver_unregister(&hisi_cpa_pmu_driver);
 388         cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE);
 389 }
 390 module_exit(hisi_cpa_pmu_module_exit);
 391
 392 MODULE_DESCRIPTION("HiSilicon SoC CPA PMU driver");
 393 MODULE_LICENSE("GPL v2");
 394 MODULE_AUTHOR("Qi Liu <liuqi115@huawei.com>");