drivers/perf/arm_smmuv3_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /*
   4  * This driver adds support for perf events to use the Performance
   5  * Monitor Counter Groups (PMCG) associated with an SMMUv3 node
   6  * to monitor that node.
   7  *
   8  * SMMUv3 PMCG devices are named as smmuv3_pmcg_<phys_addr_page> where
   9  * <phys_addr_page> is the physical page address of the SMMU PMCG wrapped
  10  * to 4K boundary. For example, the PMCG at 0xff88840000 is named
  11  * smmuv3_pmcg_ff88840
  12  *
  13  * Filtering by stream id is done by specifying filtering parameters
  14  * with the event. options are:
  15  *   filter_enable    - 0 = no filtering, 1 = filtering enabled
  16  *   filter_span      - 0 = exact match, 1 = pattern match
  17  *   filter_stream_id - pattern to filter against
  18  *
  19  * To match a partial StreamID where the X most-significant bits must match
  20  * but the Y least-significant bits might differ, STREAMID is programmed
  21  * with a value that contains:
  22  *  STREAMID[Y - 1] == 0.
  23  *  STREAMID[Y - 2:0] == 1 (where Y > 1).
  24  * The remainder of implemented bits of STREAMID (X bits, from bit Y upwards)
  25  * contain a value to match from the corresponding bits of event StreamID.
  26  *
  27  * Example: perf stat -e smmuv3_pmcg_ff88840/transaction,filter_enable=1,
  28  *                    filter_span=1,filter_stream_id=0x42/ -a netperf
  29  * Applies filter pattern 0x42 to transaction events, which means events
  30  * matching stream ids 0x42 and 0x43 are counted. Further filtering
  31  * information is available in the SMMU documentation.
  32  *
  33  * SMMU events are not attributable to a CPU, so task mode and sampling
  34  * are not supported.
  35  */
  36
  37 #include <linux/acpi.h>
  38 #include <linux/acpi_iort.h>
  39 #include <linux/bitfield.h>
  40 #include <linux/bitops.h>
  41 #include <linux/cpuhotplug.h>
  42 #include <linux/cpumask.h>
  43 #include <linux/device.h>
  44 #include <linux/errno.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/irq.h>
  47 #include <linux/kernel.h>
  48 #include <linux/list.h>
  49 #include <linux/msi.h>
  50 #include <linux/of.h>
  51 #include <linux/perf_event.h>
  52 #include <linux/platform_device.h>
  53 #include <linux/smp.h>
  54 #include <linux/sysfs.h>
  55 #include <linux/types.h>
  56
  57 #define SMMU_PMCG_EVCNTR0               0x0
  58 #define SMMU_PMCG_EVCNTR(n, stride)     (SMMU_PMCG_EVCNTR0 + (n) * (stride))
  59 #define SMMU_PMCG_EVTYPER0              0x400
  60 #define SMMU_PMCG_EVTYPER(n)            (SMMU_PMCG_EVTYPER0 + (n) * 4)
  61 #define SMMU_PMCG_SID_SPAN_SHIFT        29
  62 #define SMMU_PMCG_SMR0                  0xA00
  63 #define SMMU_PMCG_SMR(n)                (SMMU_PMCG_SMR0 + (n) * 4)
  64 #define SMMU_PMCG_CNTENSET0             0xC00
  65 #define SMMU_PMCG_CNTENCLR0             0xC20
  66 #define SMMU_PMCG_INTENSET0             0xC40
  67 #define SMMU_PMCG_INTENCLR0             0xC60
  68 #define SMMU_PMCG_OVSCLR0               0xC80
  69 #define SMMU_PMCG_OVSSET0               0xCC0
  70 #define SMMU_PMCG_CFGR                  0xE00
  71 #define SMMU_PMCG_CFGR_SID_FILTER_TYPE  BIT(23)
  72 #define SMMU_PMCG_CFGR_MSI              BIT(21)
  73 #define SMMU_PMCG_CFGR_RELOC_CTRS       BIT(20)
  74 #define SMMU_PMCG_CFGR_SIZE             GENMASK(13, 8)
  75 #define SMMU_PMCG_CFGR_NCTR             GENMASK(5, 0)
  76 #define SMMU_PMCG_CR                    0xE04
  77 #define SMMU_PMCG_CR_ENABLE             BIT(0)
  78 #define SMMU_PMCG_IIDR                  0xE08
  79 #define SMMU_PMCG_IIDR_PRODUCTID        GENMASK(31, 20)
  80 #define SMMU_PMCG_IIDR_VARIANT          GENMASK(19, 16)
  81 #define SMMU_PMCG_IIDR_REVISION         GENMASK(15, 12)
  82 #define SMMU_PMCG_IIDR_IMPLEMENTER      GENMASK(11, 0)
  83 #define SMMU_PMCG_CEID0                 0xE20
  84 #define SMMU_PMCG_CEID1                 0xE28
  85 #define SMMU_PMCG_IRQ_CTRL              0xE50
  86 #define SMMU_PMCG_IRQ_CTRL_IRQEN        BIT(0)
  87 #define SMMU_PMCG_IRQ_CFG0              0xE58
  88 #define SMMU_PMCG_IRQ_CFG1              0xE60
  89 #define SMMU_PMCG_IRQ_CFG2              0xE64
  90
  91 /* IMP-DEF ID registers */
  92 #define SMMU_PMCG_PIDR0                 0xFE0
  93 #define SMMU_PMCG_PIDR0_PART_0          GENMASK(7, 0)
  94 #define SMMU_PMCG_PIDR1                 0xFE4
  95 #define SMMU_PMCG_PIDR1_DES_0           GENMASK(7, 4)
  96 #define SMMU_PMCG_PIDR1_PART_1          GENMASK(3, 0)
  97 #define SMMU_PMCG_PIDR2                 0xFE8
  98 #define SMMU_PMCG_PIDR2_REVISION        GENMASK(7, 4)
  99 #define SMMU_PMCG_PIDR2_DES_1           GENMASK(2, 0)
 100 #define SMMU_PMCG_PIDR3                 0xFEC
 101 #define SMMU_PMCG_PIDR3_REVAND          GENMASK(7, 4)
 102 #define SMMU_PMCG_PIDR4                 0xFD0
 103 #define SMMU_PMCG_PIDR4_DES_2           GENMASK(3, 0)
 104
 105 /* MSI config fields */
 106 #define MSI_CFG0_ADDR_MASK              GENMASK_ULL(51, 2)
 107 #define MSI_CFG2_MEMATTR_DEVICE_nGnRE   0x1
 108
 109 #define SMMU_PMCG_DEFAULT_FILTER_SPAN   1
 110 #define SMMU_PMCG_DEFAULT_FILTER_SID    GENMASK(31, 0)
 111
 112 #define SMMU_PMCG_MAX_COUNTERS          64
 113 #define SMMU_PMCG_ARCH_MAX_EVENTS       128
 114
 115 #define SMMU_PMCG_PA_SHIFT              12
 116
 117 #define SMMU_PMCG_EVCNTR_RDONLY         BIT(0)
 118
 119 static int cpuhp_state_num;
 120
 121 struct smmu_pmu {
 122         struct hlist_node node;
 123         struct perf_event *events[SMMU_PMCG_MAX_COUNTERS];
 124         DECLARE_BITMAP(used_counters, SMMU_PMCG_MAX_COUNTERS);
 125         DECLARE_BITMAP(supported_events, SMMU_PMCG_ARCH_MAX_EVENTS);
 126         unsigned int irq;
 127         unsigned int on_cpu;
 128         struct pmu pmu;
 129         unsigned int num_counters;
 130         struct device *dev;
 131         void __iomem *reg_base;
 132         void __iomem *reloc_base;
 133         u64 counter_mask;
 134         u32 options;
 135         u32 iidr;
 136         bool global_filter;
 137 };
 138
 139 #define to_smmu_pmu(p) (container_of(p, struct smmu_pmu, pmu))
 140
 141 #define SMMU_PMU_EVENT_ATTR_EXTRACTOR(_name, _config, _start, _end)        \
 142         static inline u32 get_##_name(struct perf_event *event)            \
 143         {                                                                  \
 144                 return FIELD_GET(GENMASK_ULL(_end, _start),                \
 145                                  event->attr._config);                     \
 146         }                                                                  \
 147
 148 SMMU_PMU_EVENT_ATTR_EXTRACTOR(event, config, 0, 15);
 149 SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_stream_id, config1, 0, 31);
 150 SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_span, config1, 32, 32);
 151 SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_enable, config1, 33, 33);
 152
 153 static inline void smmu_pmu_enable(struct pmu *pmu)
 154 {
 155         struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu);
 156
 157         writel(SMMU_PMCG_IRQ_CTRL_IRQEN,
 158                smmu_pmu->reg_base + SMMU_PMCG_IRQ_CTRL);
 159         writel(SMMU_PMCG_CR_ENABLE, smmu_pmu->reg_base + SMMU_PMCG_CR);
 160 }
 161
 162 static inline void smmu_pmu_disable(struct pmu *pmu)
 163 {
 164         struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu);
 165
 166         writel(0, smmu_pmu->reg_base + SMMU_PMCG_CR);
 167         writel(0, smmu_pmu->reg_base + SMMU_PMCG_IRQ_CTRL);
 168 }
 169
 170 static inline void smmu_pmu_counter_set_value(struct smmu_pmu *smmu_pmu,
 171                                               u32 idx, u64 value)
 172 {
 173         if (smmu_pmu->counter_mask & BIT(32))
 174                 writeq(value, smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 8));
 175         else
 176                 writel(value, smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 4));
 177 }
 178
 179 static inline u64 smmu_pmu_counter_get_value(struct smmu_pmu *smmu_pmu, u32 idx)
 180 {
 181         u64 value;
 182
 183         if (smmu_pmu->counter_mask & BIT(32))
 184                 value = readq(smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 8));
 185         else
 186                 value = readl(smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 4));
 187
 188         return value;
 189 }
 190
 191 static inline void smmu_pmu_counter_enable(struct smmu_pmu *smmu_pmu, u32 idx)
 192 {
 193         writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_CNTENSET0);
 194 }
 195
 196 static inline void smmu_pmu_counter_disable(struct smmu_pmu *smmu_pmu, u32 idx)
 197 {
 198         writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_CNTENCLR0);
 199 }
 200
 201 static inline void smmu_pmu_interrupt_enable(struct smmu_pmu *smmu_pmu, u32 idx)
 202 {
 203         writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_INTENSET0);
 204 }
 205
 206 static inline void smmu_pmu_interrupt_disable(struct smmu_pmu *smmu_pmu,
 207                                               u32 idx)
 208 {
 209         writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_INTENCLR0);
 210 }
 211
 212 static inline void smmu_pmu_set_evtyper(struct smmu_pmu *smmu_pmu, u32 idx,
 213                                         u32 val)
 214 {
 215         writel(val, smmu_pmu->reg_base + SMMU_PMCG_EVTYPER(idx));
 216 }
 217
 218 static inline void smmu_pmu_set_smr(struct smmu_pmu *smmu_pmu, u32 idx, u32 val)
 219 {
 220         writel(val, smmu_pmu->reg_base + SMMU_PMCG_SMR(idx));
 221 }
 222
 223 static void smmu_pmu_event_update(struct perf_event *event)
 224 {
 225         struct hw_perf_event *hwc = &event->hw;
 226         struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
 227         u64 delta, prev, now;
 228         u32 idx = hwc->idx;
 229
 230         do {
 231                 prev = local64_read(&hwc->prev_count);
 232                 now = smmu_pmu_counter_get_value(smmu_pmu, idx);
 233         } while (local64_cmpxchg(&hwc->prev_count, prev, now) != prev);
 234
 235         /* handle overflow. */
 236         delta = now - prev;
 237         delta &= smmu_pmu->counter_mask;
 238
 239         local64_add(delta, &event->count);
 240 }
 241
 242 static void smmu_pmu_set_period(struct smmu_pmu *smmu_pmu,
 243                                 struct hw_perf_event *hwc)
 244 {
 245         u32 idx = hwc->idx;
 246         u64 new;
 247
 248         if (smmu_pmu->options & SMMU_PMCG_EVCNTR_RDONLY) {
 249                 /*
 250                  * On platforms that require this quirk, if the counter starts
 251                  * at < half_counter value and wraps, the current logic of
 252                  * handling the overflow may not work. It is expected that,
 253                  * those platforms will have full 64 counter bits implemented
 254                  * so that such a possibility is remote(eg: HiSilicon HIP08).
 255                  */
 256                 new = smmu_pmu_counter_get_value(smmu_pmu, idx);
 257         } else {
 258                 /*
 259                  * We limit the max period to half the max counter value
 260                  * of the counter size, so that even in the case of extreme
 261                  * interrupt latency the counter will (hopefully) not wrap
 262                  * past its initial value.
 263                  */
 264                 new = smmu_pmu->counter_mask >> 1;
 265                 smmu_pmu_counter_set_value(smmu_pmu, idx, new);
 266         }
 267
 268         local64_set(&hwc->prev_count, new);
 269 }
 270
 271 static void smmu_pmu_set_event_filter(struct perf_event *event,
 272                                       int idx, u32 span, u32 sid)
 273 {
 274         struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
 275         u32 evtyper;
 276
 277         evtyper = get_event(event) | span << SMMU_PMCG_SID_SPAN_SHIFT;
 278         smmu_pmu_set_evtyper(smmu_pmu, idx, evtyper);
 279         smmu_pmu_set_smr(smmu_pmu, idx, sid);
 280 }
 281
 282 static bool smmu_pmu_check_global_filter(struct perf_event *curr,
 283                                          struct perf_event *new)
 284 {
 285         if (get_filter_enable(new) != get_filter_enable(curr))
 286                 return false;
 287
 288         if (!get_filter_enable(new))
 289                 return true;
 290
 291         return get_filter_span(new) == get_filter_span(curr) &&
 292                get_filter_stream_id(new) == get_filter_stream_id(curr);
 293 }
 294
 295 static int smmu_pmu_apply_event_filter(struct smmu_pmu *smmu_pmu,
 296                                        struct perf_event *event, int idx)
 297 {
 298         u32 span, sid;
 299         unsigned int cur_idx, num_ctrs = smmu_pmu->num_counters;
 300         bool filter_en = !!get_filter_enable(event);
 301
 302         span = filter_en ? get_filter_span(event) :
 303                            SMMU_PMCG_DEFAULT_FILTER_SPAN;
 304         sid = filter_en ? get_filter_stream_id(event) :
 305                            SMMU_PMCG_DEFAULT_FILTER_SID;
 306
 307         cur_idx = find_first_bit(smmu_pmu->used_counters, num_ctrs);
 308         /*
 309          * Per-counter filtering, or scheduling the first globally-filtered
 310          * event into an empty PMU so idx == 0 and it works out equivalent.
 311          */
 312         if (!smmu_pmu->global_filter || cur_idx == num_ctrs) {
 313                 smmu_pmu_set_event_filter(event, idx, span, sid);
 314                 return 0;
 315         }
 316
 317         /* Otherwise, must match whatever's currently scheduled */
 318         if (smmu_pmu_check_global_filter(smmu_pmu->events[cur_idx], event)) {
 319                 smmu_pmu_set_evtyper(smmu_pmu, idx, get_event(event));
 320                 return 0;
 321         }
 322
 323         return -EAGAIN;
 324 }
 325
 326 static int smmu_pmu_get_event_idx(struct smmu_pmu *smmu_pmu,
 327                                   struct perf_event *event)
 328 {
 329         int idx, err;
 330         unsigned int num_ctrs = smmu_pmu->num_counters;
 331
 332         idx = find_first_zero_bit(smmu_pmu->used_counters, num_ctrs);
 333         if (idx == num_ctrs)
 334                 /* The counters are all in use. */
 335                 return -EAGAIN;
 336
 337         err = smmu_pmu_apply_event_filter(smmu_pmu, event, idx);
 338         if (err)
 339                 return err;
 340
 341         set_bit(idx, smmu_pmu->used_counters);
 342
 343         return idx;
 344 }
 345
 346 static bool smmu_pmu_events_compatible(struct perf_event *curr,
 347                                        struct perf_event *new)
 348 {
 349         if (new->pmu != curr->pmu)
 350                 return false;
 351
 352         if (to_smmu_pmu(new->pmu)->global_filter &&
 353             !smmu_pmu_check_global_filter(curr, new))
 354                 return false;
 355
 356         return true;
 357 }
 358
 359 /*
 360  * Implementation of abstract pmu functionality required by
 361  * the core perf events code.
 362  */
 363
 364 static int smmu_pmu_event_init(struct perf_event *event)
 365 {
 366         struct hw_perf_event *hwc = &event->hw;
 367         struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
 368         struct device *dev = smmu_pmu->dev;
 369         struct perf_event *sibling;
 370         int group_num_events = 1;
 371         u16 event_id;
 372
 373         if (event->attr.type != event->pmu->type)
 374                 return -ENOENT;
 375
 376         if (hwc->sample_period) {
 377                 dev_dbg(dev, "Sampling not supported\n");
 378                 return -EOPNOTSUPP;
 379         }
 380
 381         if (event->cpu < 0) {
 382                 dev_dbg(dev, "Per-task mode not supported\n");
 383                 return -EOPNOTSUPP;
 384         }
 385
 386         /* Verify specified event is supported on this PMU */
 387         event_id = get_event(event);
 388         if (event_id < SMMU_PMCG_ARCH_MAX_EVENTS &&
 389             (!test_bit(event_id, smmu_pmu->supported_events))) {
 390                 dev_dbg(dev, "Invalid event %d for this PMU\n", event_id);
 391                 return -EINVAL;
 392         }
 393
 394         /* Don't allow groups with mixed PMUs, except for s/w events */
 395         if (!is_software_event(event->group_leader)) {
 396                 if (!smmu_pmu_events_compatible(event->group_leader, event))
 397                         return -EINVAL;
 398
 399                 if (++group_num_events > smmu_pmu->num_counters)
 400                         return -EINVAL;
 401         }
 402
 403         for_each_sibling_event(sibling, event->group_leader) {
 404                 if (is_software_event(sibling))
 405                         continue;
 406
 407                 if (!smmu_pmu_events_compatible(sibling, event))
 408                         return -EINVAL;
 409
 410                 if (++group_num_events > smmu_pmu->num_counters)
 411                         return -EINVAL;
 412         }
 413
 414         hwc->idx = -1;
 415
 416         /*
 417          * Ensure all events are on the same cpu so all events are in the
 418          * same cpu context, to avoid races on pmu_enable etc.
 419          */
 420         event->cpu = smmu_pmu->on_cpu;
 421
 422         return 0;
 423 }
 424
 425 static void smmu_pmu_event_start(struct perf_event *event, int flags)
 426 {
 427         struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
 428         struct hw_perf_event *hwc = &event->hw;
 429         int idx = hwc->idx;
 430
 431         hwc->state = 0;
 432
 433         smmu_pmu_set_period(smmu_pmu, hwc);
 434
 435         smmu_pmu_counter_enable(smmu_pmu, idx);
 436 }
 437
 438 static void smmu_pmu_event_stop(struct perf_event *event, int flags)
 439 {
 440         struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
 441         struct hw_perf_event *hwc = &event->hw;
 442         int idx = hwc->idx;
 443
 444         if (hwc->state & PERF_HES_STOPPED)
 445                 return;
 446
 447         smmu_pmu_counter_disable(smmu_pmu, idx);
 448         /* As the counter gets updated on _start, ignore PERF_EF_UPDATE */
 449         smmu_pmu_event_update(event);
 450         hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
 451 }
 452
 453 static int smmu_pmu_event_add(struct perf_event *event, int flags)
 454 {
 455         struct hw_perf_event *hwc = &event->hw;
 456         int idx;
 457         struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
 458
 459         idx = smmu_pmu_get_event_idx(smmu_pmu, event);
 460         if (idx < 0)
 461                 return idx;
 462
 463         hwc->idx = idx;
 464         hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
 465         smmu_pmu->events[idx] = event;
 466         local64_set(&hwc->prev_count, 0);
 467
 468         smmu_pmu_interrupt_enable(smmu_pmu, idx);
 469
 470         if (flags & PERF_EF_START)
 471                 smmu_pmu_event_start(event, flags);
 472
 473         /* Propagate changes to the userspace mapping. */
 474         perf_event_update_userpage(event);
 475
 476         return 0;
 477 }
 478
 479 static void smmu_pmu_event_del(struct perf_event *event, int flags)
 480 {
 481         struct hw_perf_event *hwc = &event->hw;
 482         struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
 483         int idx = hwc->idx;
 484
 485         smmu_pmu_event_stop(event, flags | PERF_EF_UPDATE);
 486         smmu_pmu_interrupt_disable(smmu_pmu, idx);
 487         smmu_pmu->events[idx] = NULL;
 488         clear_bit(idx, smmu_pmu->used_counters);
 489
 490         perf_event_update_userpage(event);
 491 }
 492
 493 static void smmu_pmu_event_read(struct perf_event *event)
 494 {
 495         smmu_pmu_event_update(event);
 496 }
 497
 498 /* cpumask */
 499
 500 static ssize_t smmu_pmu_cpumask_show(struct device *dev,
 501                                      struct device_attribute *attr,
 502                                      char *buf)
 503 {
 504         struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev));
 505
 506         return cpumap_print_to_pagebuf(true, buf, cpumask_of(smmu_pmu->on_cpu));
 507 }
 508
 509 static struct device_attribute smmu_pmu_cpumask_attr =
 510                 __ATTR(cpumask, 0444, smmu_pmu_cpumask_show, NULL);
 511
 512 static struct attribute *smmu_pmu_cpumask_attrs[] = {
 513         &smmu_pmu_cpumask_attr.attr,
 514         NULL
 515 };
 516
 517 static const struct attribute_group smmu_pmu_cpumask_group = {
 518         .attrs = smmu_pmu_cpumask_attrs,
 519 };
 520
 521 /* Events */
 522
 523 static ssize_t smmu_pmu_event_show(struct device *dev,
 524                                    struct device_attribute *attr, char *page)
 525 {
 526         struct perf_pmu_events_attr *pmu_attr;
 527
 528         pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
 529
 530         return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 531 }
 532
 533 #define SMMU_EVENT_ATTR(name, config)                   \
 534         PMU_EVENT_ATTR_ID(name, smmu_pmu_event_show, config)
 535
 536 static struct attribute *smmu_pmu_events[] = {
 537         SMMU_EVENT_ATTR(cycles, 0),
 538         SMMU_EVENT_ATTR(transaction, 1),
 539         SMMU_EVENT_ATTR(tlb_miss, 2),
 540         SMMU_EVENT_ATTR(config_cache_miss, 3),
 541         SMMU_EVENT_ATTR(trans_table_walk_access, 4),
 542         SMMU_EVENT_ATTR(config_struct_access, 5),
 543         SMMU_EVENT_ATTR(pcie_ats_trans_rq, 6),
 544         SMMU_EVENT_ATTR(pcie_ats_trans_passed, 7),
 545         NULL
 546 };
 547
 548 static umode_t smmu_pmu_event_is_visible(struct kobject *kobj,
 549                                          struct attribute *attr, int unused)
 550 {
 551         struct device *dev = kobj_to_dev(kobj);
 552         struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev));
 553         struct perf_pmu_events_attr *pmu_attr;
 554
 555         pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr);
 556
 557         if (test_bit(pmu_attr->id, smmu_pmu->supported_events))
 558                 return attr->mode;
 559
 560         return 0;
 561 }
 562
 563 static const struct attribute_group smmu_pmu_events_group = {
 564         .name = "events",
 565         .attrs = smmu_pmu_events,
 566         .is_visible = smmu_pmu_event_is_visible,
 567 };
 568
 569 static ssize_t smmu_pmu_identifier_attr_show(struct device *dev,
 570                                         struct device_attribute *attr,
 571                                         char *page)
 572 {
 573         struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev));
 574
 575         return sysfs_emit(page, "0x%08x\n", smmu_pmu->iidr);
 576 }
 577
 578 static umode_t smmu_pmu_identifier_attr_visible(struct kobject *kobj,
 579                                                 struct attribute *attr,
 580                                                 int n)
 581 {
 582         struct device *dev = kobj_to_dev(kobj);
 583         struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev));
 584
 585         if (!smmu_pmu->iidr)
 586                 return 0;
 587         return attr->mode;
 588 }
 589
 590 static struct device_attribute smmu_pmu_identifier_attr =
 591         __ATTR(identifier, 0444, smmu_pmu_identifier_attr_show, NULL);
 592
 593 static struct attribute *smmu_pmu_identifier_attrs[] = {
 594         &smmu_pmu_identifier_attr.attr,
 595         NULL
 596 };
 597
 598 static const struct attribute_group smmu_pmu_identifier_group = {
 599         .attrs = smmu_pmu_identifier_attrs,
 600         .is_visible = smmu_pmu_identifier_attr_visible,
 601 };
 602
 603 /* Formats */
 604 PMU_FORMAT_ATTR(event,             "config:0-15");
 605 PMU_FORMAT_ATTR(filter_stream_id,  "config1:0-31");
 606 PMU_FORMAT_ATTR(filter_span,       "config1:32");
 607 PMU_FORMAT_ATTR(filter_enable,     "config1:33");
 608
 609 static struct attribute *smmu_pmu_formats[] = {
 610         &format_attr_event.attr,
 611         &format_attr_filter_stream_id.attr,
 612         &format_attr_filter_span.attr,
 613         &format_attr_filter_enable.attr,
 614         NULL
 615 };
 616
 617 static const struct attribute_group smmu_pmu_format_group = {
 618         .name = "format",
 619         .attrs = smmu_pmu_formats,
 620 };
 621
 622 static const struct attribute_group *smmu_pmu_attr_grps[] = {
 623         &smmu_pmu_cpumask_group,
 624         &smmu_pmu_events_group,
 625         &smmu_pmu_format_group,
 626         &smmu_pmu_identifier_group,
 627         NULL
 628 };
 629
 630 /*
 631  * Generic device handlers
 632  */
 633
 634 static int smmu_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
 635 {
 636         struct smmu_pmu *smmu_pmu;
 637         unsigned int target;
 638
 639         smmu_pmu = hlist_entry_safe(node, struct smmu_pmu, node);
 640         if (cpu != smmu_pmu->on_cpu)
 641                 return 0;
 642
 643         target = cpumask_any_but(cpu_online_mask, cpu);
 644         if (target >= nr_cpu_ids)
 645                 return 0;
 646
 647         perf_pmu_migrate_context(&smmu_pmu->pmu, cpu, target);
 648         smmu_pmu->on_cpu = target;
 649         WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(target)));
 650
 651         return 0;
 652 }
 653
 654 static irqreturn_t smmu_pmu_handle_irq(int irq_num, void *data)
 655 {
 656         struct smmu_pmu *smmu_pmu = data;
 657         DECLARE_BITMAP(ovs, BITS_PER_TYPE(u64));
 658         u64 ovsr;
 659         unsigned int idx;
 660
 661         ovsr = readq(smmu_pmu->reloc_base + SMMU_PMCG_OVSSET0);
 662         if (!ovsr)
 663                 return IRQ_NONE;
 664
 665         writeq(ovsr, smmu_pmu->reloc_base + SMMU_PMCG_OVSCLR0);
 666
 667         bitmap_from_u64(ovs, ovsr);
 668         for_each_set_bit(idx, ovs, smmu_pmu->num_counters) {
 669                 struct perf_event *event = smmu_pmu->events[idx];
 670                 struct hw_perf_event *hwc;
 671
 672                 if (WARN_ON_ONCE(!event))
 673                         continue;
 674
 675                 smmu_pmu_event_update(event);
 676                 hwc = &event->hw;
 677
 678                 smmu_pmu_set_period(smmu_pmu, hwc);
 679         }
 680
 681         return IRQ_HANDLED;
 682 }
 683
 684 static void smmu_pmu_free_msis(void *data)
 685 {
 686         struct device *dev = data;
 687
 688         platform_msi_domain_free_irqs(dev);
 689 }
 690
 691 static void smmu_pmu_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
 692 {
 693         phys_addr_t doorbell;
 694         struct device *dev = msi_desc_to_dev(desc);
 695         struct smmu_pmu *pmu = dev_get_drvdata(dev);
 696
 697         doorbell = (((u64)msg->address_hi) << 32) | msg->address_lo;
 698         doorbell &= MSI_CFG0_ADDR_MASK;
 699
 700         writeq_relaxed(doorbell, pmu->reg_base + SMMU_PMCG_IRQ_CFG0);
 701         writel_relaxed(msg->data, pmu->reg_base + SMMU_PMCG_IRQ_CFG1);
 702         writel_relaxed(MSI_CFG2_MEMATTR_DEVICE_nGnRE,
 703                        pmu->reg_base + SMMU_PMCG_IRQ_CFG2);
 704 }
 705
 706 static void smmu_pmu_setup_msi(struct smmu_pmu *pmu)
 707 {
 708         struct device *dev = pmu->dev;
 709         int ret;
 710
 711         /* Clear MSI address reg */
 712         writeq_relaxed(0, pmu->reg_base + SMMU_PMCG_IRQ_CFG0);
 713
 714         /* MSI supported or not */
 715         if (!(readl(pmu->reg_base + SMMU_PMCG_CFGR) & SMMU_PMCG_CFGR_MSI))
 716                 return;
 717
 718         ret = platform_msi_domain_alloc_irqs(dev, 1, smmu_pmu_write_msi_msg);
 719         if (ret) {
 720                 dev_warn(dev, "failed to allocate MSIs\n");
 721                 return;
 722         }
 723
 724         pmu->irq = msi_get_virq(dev, 0);
 725
 726         /* Add callback to free MSIs on teardown */
 727         devm_add_action(dev, smmu_pmu_free_msis, dev);
 728 }
 729
 730 static int smmu_pmu_setup_irq(struct smmu_pmu *pmu)
 731 {
 732         unsigned long flags = IRQF_NOBALANCING | IRQF_SHARED | IRQF_NO_THREAD;
 733         int irq, ret = -ENXIO;
 734
 735         smmu_pmu_setup_msi(pmu);
 736
 737         irq = pmu->irq;
 738         if (irq)
 739                 ret = devm_request_irq(pmu->dev, irq, smmu_pmu_handle_irq,
 740                                        flags, "smmuv3-pmu", pmu);
 741         return ret;
 742 }
 743
 744 static void smmu_pmu_reset(struct smmu_pmu *smmu_pmu)
 745 {
 746         u64 counter_present_mask = GENMASK_ULL(smmu_pmu->num_counters - 1, 0);
 747
 748         smmu_pmu_disable(&smmu_pmu->pmu);
 749
 750         /* Disable counter and interrupt */
 751         writeq_relaxed(counter_present_mask,
 752                        smmu_pmu->reg_base + SMMU_PMCG_CNTENCLR0);
 753         writeq_relaxed(counter_present_mask,
 754                        smmu_pmu->reg_base + SMMU_PMCG_INTENCLR0);
 755         writeq_relaxed(counter_present_mask,
 756                        smmu_pmu->reloc_base + SMMU_PMCG_OVSCLR0);
 757 }
 758
 759 static void smmu_pmu_get_acpi_options(struct smmu_pmu *smmu_pmu)
 760 {
 761         u32 model;
 762
 763         model = *(u32 *)dev_get_platdata(smmu_pmu->dev);
 764
 765         switch (model) {
 766         case IORT_SMMU_V3_PMCG_HISI_HIP08:
 767                 /* HiSilicon Erratum 162001800 */
 768                 smmu_pmu->options |= SMMU_PMCG_EVCNTR_RDONLY;
 769                 break;
 770         }
 771
 772         dev_notice(smmu_pmu->dev, "option mask 0x%x\n", smmu_pmu->options);
 773 }
 774
 775 static bool smmu_pmu_coresight_id_regs(struct smmu_pmu *smmu_pmu)
 776 {
 777         return of_device_is_compatible(smmu_pmu->dev->of_node,
 778                                        "arm,mmu-600-pmcg");
 779 }
 780
 781 static void smmu_pmu_get_iidr(struct smmu_pmu *smmu_pmu)
 782 {
 783         u32 iidr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_IIDR);
 784
 785         if (!iidr && smmu_pmu_coresight_id_regs(smmu_pmu)) {
 786                 u32 pidr0 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR0);
 787                 u32 pidr1 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR1);
 788                 u32 pidr2 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR2);
 789                 u32 pidr3 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR3);
 790                 u32 pidr4 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR4);
 791
 792                 u32 productid = FIELD_GET(SMMU_PMCG_PIDR0_PART_0, pidr0) |
 793                                 (FIELD_GET(SMMU_PMCG_PIDR1_PART_1, pidr1) << 8);
 794                 u32 variant = FIELD_GET(SMMU_PMCG_PIDR2_REVISION, pidr2);
 795                 u32 revision = FIELD_GET(SMMU_PMCG_PIDR3_REVAND, pidr3);
 796                 u32 implementer =
 797                         FIELD_GET(SMMU_PMCG_PIDR1_DES_0, pidr1) |
 798                         (FIELD_GET(SMMU_PMCG_PIDR2_DES_1, pidr2) << 4) |
 799                         (FIELD_GET(SMMU_PMCG_PIDR4_DES_2, pidr4) << 8);
 800
 801                 iidr = FIELD_PREP(SMMU_PMCG_IIDR_PRODUCTID, productid) |
 802                        FIELD_PREP(SMMU_PMCG_IIDR_VARIANT, variant) |
 803                        FIELD_PREP(SMMU_PMCG_IIDR_REVISION, revision) |
 804                        FIELD_PREP(SMMU_PMCG_IIDR_IMPLEMENTER, implementer);
 805         }
 806
 807         smmu_pmu->iidr = iidr;
 808 }
 809
 810 static int smmu_pmu_probe(struct platform_device *pdev)
 811 {
 812         struct smmu_pmu *smmu_pmu;
 813         struct resource *res_0;
 814         u32 cfgr, reg_size;
 815         u64 ceid_64[2];
 816         int irq, err;
 817         char *name;
 818         struct device *dev = &pdev->dev;
 819
 820         smmu_pmu = devm_kzalloc(dev, sizeof(*smmu_pmu), GFP_KERNEL);
 821         if (!smmu_pmu)
 822                 return -ENOMEM;
 823
 824         smmu_pmu->dev = dev;
 825         platform_set_drvdata(pdev, smmu_pmu);
 826
 827         smmu_pmu->pmu = (struct pmu) {
 828                 .module         = THIS_MODULE,
 829                 .task_ctx_nr    = perf_invalid_context,
 830                 .pmu_enable     = smmu_pmu_enable,
 831                 .pmu_disable    = smmu_pmu_disable,
 832                 .event_init     = smmu_pmu_event_init,
 833                 .add            = smmu_pmu_event_add,
 834                 .del            = smmu_pmu_event_del,
 835                 .start          = smmu_pmu_event_start,
 836                 .stop           = smmu_pmu_event_stop,
 837                 .read           = smmu_pmu_event_read,
 838                 .attr_groups    = smmu_pmu_attr_grps,
 839                 .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
 840         };
 841
 842         smmu_pmu->reg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res_0);
 843         if (IS_ERR(smmu_pmu->reg_base))
 844                 return PTR_ERR(smmu_pmu->reg_base);
 845
 846         cfgr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CFGR);
 847
 848         /* Determine if page 1 is present */
 849         if (cfgr & SMMU_PMCG_CFGR_RELOC_CTRS) {
 850                 smmu_pmu->reloc_base = devm_platform_ioremap_resource(pdev, 1);
 851                 if (IS_ERR(smmu_pmu->reloc_base))
 852                         return PTR_ERR(smmu_pmu->reloc_base);
 853         } else {
 854                 smmu_pmu->reloc_base = smmu_pmu->reg_base;
 855         }
 856
 857         irq = platform_get_irq_optional(pdev, 0);
 858         if (irq > 0)
 859                 smmu_pmu->irq = irq;
 860
 861         ceid_64[0] = readq_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CEID0);
 862         ceid_64[1] = readq_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CEID1);
 863         bitmap_from_arr32(smmu_pmu->supported_events, (u32 *)ceid_64,
 864                           SMMU_PMCG_ARCH_MAX_EVENTS);
 865
 866         smmu_pmu->num_counters = FIELD_GET(SMMU_PMCG_CFGR_NCTR, cfgr) + 1;
 867
 868         smmu_pmu->global_filter = !!(cfgr & SMMU_PMCG_CFGR_SID_FILTER_TYPE);
 869
 870         reg_size = FIELD_GET(SMMU_PMCG_CFGR_SIZE, cfgr);
 871         smmu_pmu->counter_mask = GENMASK_ULL(reg_size, 0);
 872
 873         smmu_pmu_reset(smmu_pmu);
 874
 875         err = smmu_pmu_setup_irq(smmu_pmu);
 876         if (err) {
 877                 dev_err(dev, "Setup irq failed, PMU @%pa\n", &res_0->start);
 878                 return err;
 879         }
 880
 881         smmu_pmu_get_iidr(smmu_pmu);
 882
 883         name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "smmuv3_pmcg_%llx",
 884                               (res_0->start) >> SMMU_PMCG_PA_SHIFT);
 885         if (!name) {
 886                 dev_err(dev, "Create name failed, PMU @%pa\n", &res_0->start);
 887                 return -EINVAL;
 888         }
 889
 890         if (!dev->of_node)
 891                 smmu_pmu_get_acpi_options(smmu_pmu);
 892
 893         /* Pick one CPU to be the preferred one to use */
 894         smmu_pmu->on_cpu = raw_smp_processor_id();
 895         WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(smmu_pmu->on_cpu)));
 896
 897         err = cpuhp_state_add_instance_nocalls(cpuhp_state_num,
 898                                                &smmu_pmu->node);
 899         if (err) {
 900                 dev_err(dev, "Error %d registering hotplug, PMU @%pa\n",
 901                         err, &res_0->start);
 902                 return err;
 903         }
 904
 905         err = perf_pmu_register(&smmu_pmu->pmu, name, -1);
 906         if (err) {
 907                 dev_err(dev, "Error %d registering PMU @%pa\n",
 908                         err, &res_0->start);
 909                 goto out_unregister;
 910         }
 911
 912         dev_info(dev, "Registered PMU @ %pa using %d counters with %s filter settings\n",
 913                  &res_0->start, smmu_pmu->num_counters,
 914                  smmu_pmu->global_filter ? "Global(Counter0)" :
 915                  "Individual");
 916
 917         return 0;
 918
 919 out_unregister:
 920         cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node);
 921         return err;
 922 }
 923
 924 static int smmu_pmu_remove(struct platform_device *pdev)
 925 {
 926         struct smmu_pmu *smmu_pmu = platform_get_drvdata(pdev);
 927
 928         perf_pmu_unregister(&smmu_pmu->pmu);
 929         cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node);
 930
 931         return 0;
 932 }
 933
 934 static void smmu_pmu_shutdown(struct platform_device *pdev)
 935 {
 936         struct smmu_pmu *smmu_pmu = platform_get_drvdata(pdev);
 937
 938         smmu_pmu_disable(&smmu_pmu->pmu);
 939 }
 940
 941 #ifdef CONFIG_OF
 942 static const struct of_device_id smmu_pmu_of_match[] = {
 943         { .compatible = "arm,smmu-v3-pmcg" },
 944         {}
 945 };
 946 MODULE_DEVICE_TABLE(of, smmu_pmu_of_match);
 947 #endif
 948
 949 static struct platform_driver smmu_pmu_driver = {
 950         .driver = {
 951                 .name = "arm-smmu-v3-pmcg",
 952                 .of_match_table = of_match_ptr(smmu_pmu_of_match),
 953                 .suppress_bind_attrs = true,
 954         },
 955         .probe = smmu_pmu_probe,
 956         .remove = smmu_pmu_remove,
 957         .shutdown = smmu_pmu_shutdown,
 958 };
 959
 960 static int __init arm_smmu_pmu_init(void)
 961 {
 962         int ret;
 963
 964         cpuhp_state_num = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
 965                                                   "perf/arm/pmcg:online",
 966                                                   NULL,
 967                                                   smmu_pmu_offline_cpu);
 968         if (cpuhp_state_num < 0)
 969                 return cpuhp_state_num;
 970
 971         ret = platform_driver_register(&smmu_pmu_driver);
 972         if (ret)
 973                 cpuhp_remove_multi_state(cpuhp_state_num);
 974
 975         return ret;
 976 }
 977 module_init(arm_smmu_pmu_init);
 978
 979 static void __exit arm_smmu_pmu_exit(void)
 980 {
 981         platform_driver_unregister(&smmu_pmu_driver);
 982         cpuhp_remove_multi_state(cpuhp_state_num);
 983 }
 984
 985 module_exit(arm_smmu_pmu_exit);
 986
 987 MODULE_DESCRIPTION("PMU driver for ARM SMMUv3 Performance Monitors Extension");
 988 MODULE_AUTHOR("Neil Leeder <[email protected]>");
 989 MODULE_AUTHOR("Shameer Kolothum <[email protected]>");
 990 MODULE_LICENSE("GPL v2");