Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 Advanced Micro Devices, Inc. |
| 3 | * |
| 4 | * Author: Jacob Shin <jacob.shin@amd.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/perf_event.h> |
| 12 | #include <linux/percpu.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/cpu.h> |
| 17 | #include <linux/cpumask.h> |
| 18 | |
| 19 | #include <asm/cpufeature.h> |
| 20 | #include <asm/perf_event.h> |
| 21 | #include <asm/msr.h> |
| 22 | |
| 23 | #define NUM_COUNTERS_NB 4 |
| 24 | #define NUM_COUNTERS_L2 4 |
| 25 | #define MAX_COUNTERS NUM_COUNTERS_NB |
| 26 | |
| 27 | #define RDPMC_BASE_NB 6 |
| 28 | #define RDPMC_BASE_L2 10 |
| 29 | |
| 30 | #define COUNTER_SHIFT 16 |
| 31 | |
Sebastian Andrzej Siewior | 7d762e4 | 2016-09-09 18:08:23 +0200 | [diff] [blame] | 32 | static HLIST_HEAD(uncore_unused_list); |
| 33 | |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 34 | struct amd_uncore { |
| 35 | int id; |
| 36 | int refcnt; |
| 37 | int cpu; |
| 38 | int num_counters; |
| 39 | int rdpmc_base; |
| 40 | u32 msr_base; |
| 41 | cpumask_t *active_mask; |
| 42 | struct pmu *pmu; |
| 43 | struct perf_event *events[MAX_COUNTERS]; |
Sebastian Andrzej Siewior | 7d762e4 | 2016-09-09 18:08:23 +0200 | [diff] [blame] | 44 | struct hlist_node node; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 45 | }; |
| 46 | |
| 47 | static struct amd_uncore * __percpu *amd_uncore_nb; |
| 48 | static struct amd_uncore * __percpu *amd_uncore_l2; |
| 49 | |
| 50 | static struct pmu amd_nb_pmu; |
| 51 | static struct pmu amd_l2_pmu; |
| 52 | |
| 53 | static cpumask_t amd_nb_active_mask; |
| 54 | static cpumask_t amd_l2_active_mask; |
| 55 | |
| 56 | static bool is_nb_event(struct perf_event *event) |
| 57 | { |
| 58 | return event->pmu->type == amd_nb_pmu.type; |
| 59 | } |
| 60 | |
| 61 | static bool is_l2_event(struct perf_event *event) |
| 62 | { |
| 63 | return event->pmu->type == amd_l2_pmu.type; |
| 64 | } |
| 65 | |
| 66 | static struct amd_uncore *event_to_amd_uncore(struct perf_event *event) |
| 67 | { |
| 68 | if (is_nb_event(event) && amd_uncore_nb) |
| 69 | return *per_cpu_ptr(amd_uncore_nb, event->cpu); |
| 70 | else if (is_l2_event(event) && amd_uncore_l2) |
| 71 | return *per_cpu_ptr(amd_uncore_l2, event->cpu); |
| 72 | |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | static void amd_uncore_read(struct perf_event *event) |
| 77 | { |
| 78 | struct hw_perf_event *hwc = &event->hw; |
| 79 | u64 prev, new; |
| 80 | s64 delta; |
| 81 | |
| 82 | /* |
| 83 | * since we do not enable counter overflow interrupts, |
| 84 | * we do not have to worry about prev_count changing on us |
| 85 | */ |
| 86 | |
| 87 | prev = local64_read(&hwc->prev_count); |
| 88 | rdpmcl(hwc->event_base_rdpmc, new); |
| 89 | local64_set(&hwc->prev_count, new); |
| 90 | delta = (new << COUNTER_SHIFT) - (prev << COUNTER_SHIFT); |
| 91 | delta >>= COUNTER_SHIFT; |
| 92 | local64_add(delta, &event->count); |
| 93 | } |
| 94 | |
| 95 | static void amd_uncore_start(struct perf_event *event, int flags) |
| 96 | { |
| 97 | struct hw_perf_event *hwc = &event->hw; |
| 98 | |
| 99 | if (flags & PERF_EF_RELOAD) |
| 100 | wrmsrl(hwc->event_base, (u64)local64_read(&hwc->prev_count)); |
| 101 | |
| 102 | hwc->state = 0; |
| 103 | wrmsrl(hwc->config_base, (hwc->config | ARCH_PERFMON_EVENTSEL_ENABLE)); |
| 104 | perf_event_update_userpage(event); |
| 105 | } |
| 106 | |
| 107 | static void amd_uncore_stop(struct perf_event *event, int flags) |
| 108 | { |
| 109 | struct hw_perf_event *hwc = &event->hw; |
| 110 | |
| 111 | wrmsrl(hwc->config_base, hwc->config); |
| 112 | hwc->state |= PERF_HES_STOPPED; |
| 113 | |
| 114 | if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) { |
| 115 | amd_uncore_read(event); |
| 116 | hwc->state |= PERF_HES_UPTODATE; |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | static int amd_uncore_add(struct perf_event *event, int flags) |
| 121 | { |
| 122 | int i; |
| 123 | struct amd_uncore *uncore = event_to_amd_uncore(event); |
| 124 | struct hw_perf_event *hwc = &event->hw; |
| 125 | |
| 126 | /* are we already assigned? */ |
| 127 | if (hwc->idx != -1 && uncore->events[hwc->idx] == event) |
| 128 | goto out; |
| 129 | |
| 130 | for (i = 0; i < uncore->num_counters; i++) { |
| 131 | if (uncore->events[i] == event) { |
| 132 | hwc->idx = i; |
| 133 | goto out; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | /* if not, take the first available counter */ |
| 138 | hwc->idx = -1; |
| 139 | for (i = 0; i < uncore->num_counters; i++) { |
| 140 | if (cmpxchg(&uncore->events[i], NULL, event) == NULL) { |
| 141 | hwc->idx = i; |
| 142 | break; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | out: |
| 147 | if (hwc->idx == -1) |
| 148 | return -EBUSY; |
| 149 | |
| 150 | hwc->config_base = uncore->msr_base + (2 * hwc->idx); |
| 151 | hwc->event_base = uncore->msr_base + 1 + (2 * hwc->idx); |
| 152 | hwc->event_base_rdpmc = uncore->rdpmc_base + hwc->idx; |
| 153 | hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED; |
| 154 | |
| 155 | if (flags & PERF_EF_START) |
| 156 | amd_uncore_start(event, PERF_EF_RELOAD); |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static void amd_uncore_del(struct perf_event *event, int flags) |
| 162 | { |
| 163 | int i; |
| 164 | struct amd_uncore *uncore = event_to_amd_uncore(event); |
| 165 | struct hw_perf_event *hwc = &event->hw; |
| 166 | |
| 167 | amd_uncore_stop(event, PERF_EF_UPDATE); |
| 168 | |
| 169 | for (i = 0; i < uncore->num_counters; i++) { |
| 170 | if (cmpxchg(&uncore->events[i], event, NULL) == event) |
| 171 | break; |
| 172 | } |
| 173 | |
| 174 | hwc->idx = -1; |
| 175 | } |
| 176 | |
| 177 | static int amd_uncore_event_init(struct perf_event *event) |
| 178 | { |
| 179 | struct amd_uncore *uncore; |
| 180 | struct hw_perf_event *hwc = &event->hw; |
| 181 | |
| 182 | if (event->attr.type != event->pmu->type) |
| 183 | return -ENOENT; |
| 184 | |
| 185 | /* |
| 186 | * NB and L2 counters (MSRs) are shared across all cores that share the |
| 187 | * same NB / L2 cache. Interrupts can be directed to a single target |
| 188 | * core, however, event counts generated by processes running on other |
| 189 | * cores cannot be masked out. So we do not support sampling and |
| 190 | * per-thread events. |
| 191 | */ |
| 192 | if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) |
| 193 | return -EINVAL; |
| 194 | |
| 195 | /* NB and L2 counters do not have usr/os/guest/host bits */ |
| 196 | if (event->attr.exclude_user || event->attr.exclude_kernel || |
| 197 | event->attr.exclude_host || event->attr.exclude_guest) |
| 198 | return -EINVAL; |
| 199 | |
| 200 | /* and we do not enable counter overflow interrupts */ |
| 201 | hwc->config = event->attr.config & AMD64_RAW_EVENT_MASK_NB; |
| 202 | hwc->idx = -1; |
| 203 | |
| 204 | if (event->cpu < 0) |
| 205 | return -EINVAL; |
| 206 | |
| 207 | uncore = event_to_amd_uncore(event); |
| 208 | if (!uncore) |
| 209 | return -ENODEV; |
| 210 | |
| 211 | /* |
| 212 | * since request can come in to any of the shared cores, we will remap |
| 213 | * to a single common cpu. |
| 214 | */ |
| 215 | event->cpu = uncore->cpu; |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static ssize_t amd_uncore_attr_show_cpumask(struct device *dev, |
| 221 | struct device_attribute *attr, |
| 222 | char *buf) |
| 223 | { |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 224 | cpumask_t *active_mask; |
| 225 | struct pmu *pmu = dev_get_drvdata(dev); |
| 226 | |
| 227 | if (pmu->type == amd_nb_pmu.type) |
| 228 | active_mask = &amd_nb_active_mask; |
| 229 | else if (pmu->type == amd_l2_pmu.type) |
| 230 | active_mask = &amd_l2_active_mask; |
| 231 | else |
| 232 | return 0; |
| 233 | |
Sudeep Holla | 5aaba36 | 2014-09-30 14:48:22 +0100 | [diff] [blame] | 234 | return cpumap_print_to_pagebuf(true, buf, active_mask); |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 235 | } |
| 236 | static DEVICE_ATTR(cpumask, S_IRUGO, amd_uncore_attr_show_cpumask, NULL); |
| 237 | |
| 238 | static struct attribute *amd_uncore_attrs[] = { |
| 239 | &dev_attr_cpumask.attr, |
| 240 | NULL, |
| 241 | }; |
| 242 | |
| 243 | static struct attribute_group amd_uncore_attr_group = { |
| 244 | .attrs = amd_uncore_attrs, |
| 245 | }; |
| 246 | |
| 247 | PMU_FORMAT_ATTR(event, "config:0-7,32-35"); |
| 248 | PMU_FORMAT_ATTR(umask, "config:8-15"); |
| 249 | |
| 250 | static struct attribute *amd_uncore_format_attr[] = { |
| 251 | &format_attr_event.attr, |
| 252 | &format_attr_umask.attr, |
| 253 | NULL, |
| 254 | }; |
| 255 | |
| 256 | static struct attribute_group amd_uncore_format_group = { |
| 257 | .name = "format", |
| 258 | .attrs = amd_uncore_format_attr, |
| 259 | }; |
| 260 | |
| 261 | static const struct attribute_group *amd_uncore_attr_groups[] = { |
| 262 | &amd_uncore_attr_group, |
| 263 | &amd_uncore_format_group, |
| 264 | NULL, |
| 265 | }; |
| 266 | |
| 267 | static struct pmu amd_nb_pmu = { |
Peter Zijlstra | 31d50c5 | 2016-04-04 16:02:08 +0200 | [diff] [blame] | 268 | .task_ctx_nr = perf_invalid_context, |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 269 | .attr_groups = amd_uncore_attr_groups, |
| 270 | .name = "amd_nb", |
| 271 | .event_init = amd_uncore_event_init, |
| 272 | .add = amd_uncore_add, |
| 273 | .del = amd_uncore_del, |
| 274 | .start = amd_uncore_start, |
| 275 | .stop = amd_uncore_stop, |
| 276 | .read = amd_uncore_read, |
| 277 | }; |
| 278 | |
| 279 | static struct pmu amd_l2_pmu = { |
Peter Zijlstra | 31d50c5 | 2016-04-04 16:02:08 +0200 | [diff] [blame] | 280 | .task_ctx_nr = perf_invalid_context, |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 281 | .attr_groups = amd_uncore_attr_groups, |
| 282 | .name = "amd_l2", |
| 283 | .event_init = amd_uncore_event_init, |
| 284 | .add = amd_uncore_add, |
| 285 | .del = amd_uncore_del, |
| 286 | .start = amd_uncore_start, |
| 287 | .stop = amd_uncore_stop, |
| 288 | .read = amd_uncore_read, |
| 289 | }; |
| 290 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 291 | static struct amd_uncore *amd_uncore_alloc(unsigned int cpu) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 292 | { |
| 293 | return kzalloc_node(sizeof(struct amd_uncore), GFP_KERNEL, |
| 294 | cpu_to_node(cpu)); |
| 295 | } |
| 296 | |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 297 | static int amd_uncore_cpu_up_prepare(unsigned int cpu) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 298 | { |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 299 | struct amd_uncore *uncore_nb = NULL, *uncore_l2; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 300 | |
| 301 | if (amd_uncore_nb) { |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 302 | uncore_nb = amd_uncore_alloc(cpu); |
| 303 | if (!uncore_nb) |
| 304 | goto fail; |
| 305 | uncore_nb->cpu = cpu; |
| 306 | uncore_nb->num_counters = NUM_COUNTERS_NB; |
| 307 | uncore_nb->rdpmc_base = RDPMC_BASE_NB; |
| 308 | uncore_nb->msr_base = MSR_F15H_NB_PERF_CTL; |
| 309 | uncore_nb->active_mask = &amd_nb_active_mask; |
| 310 | uncore_nb->pmu = &amd_nb_pmu; |
Sebastian Andrzej Siewior | 7d762e4 | 2016-09-09 18:08:23 +0200 | [diff] [blame] | 311 | uncore_nb->id = -1; |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 312 | *per_cpu_ptr(amd_uncore_nb, cpu) = uncore_nb; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | if (amd_uncore_l2) { |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 316 | uncore_l2 = amd_uncore_alloc(cpu); |
| 317 | if (!uncore_l2) |
| 318 | goto fail; |
| 319 | uncore_l2->cpu = cpu; |
| 320 | uncore_l2->num_counters = NUM_COUNTERS_L2; |
| 321 | uncore_l2->rdpmc_base = RDPMC_BASE_L2; |
| 322 | uncore_l2->msr_base = MSR_F16H_L2I_PERF_CTL; |
| 323 | uncore_l2->active_mask = &amd_l2_active_mask; |
| 324 | uncore_l2->pmu = &amd_l2_pmu; |
Sebastian Andrzej Siewior | 7d762e4 | 2016-09-09 18:08:23 +0200 | [diff] [blame] | 325 | uncore_l2->id = -1; |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 326 | *per_cpu_ptr(amd_uncore_l2, cpu) = uncore_l2; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 327 | } |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 328 | |
| 329 | return 0; |
| 330 | |
| 331 | fail: |
Thomas Gleixner | 8bc9162 | 2016-02-16 23:04:41 +0100 | [diff] [blame] | 332 | if (amd_uncore_nb) |
| 333 | *per_cpu_ptr(amd_uncore_nb, cpu) = NULL; |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 334 | kfree(uncore_nb); |
| 335 | return -ENOMEM; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | static struct amd_uncore * |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 339 | amd_uncore_find_online_sibling(struct amd_uncore *this, |
| 340 | struct amd_uncore * __percpu *uncores) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 341 | { |
| 342 | unsigned int cpu; |
| 343 | struct amd_uncore *that; |
| 344 | |
| 345 | for_each_online_cpu(cpu) { |
| 346 | that = *per_cpu_ptr(uncores, cpu); |
| 347 | |
| 348 | if (!that) |
| 349 | continue; |
| 350 | |
| 351 | if (this == that) |
| 352 | continue; |
| 353 | |
| 354 | if (this->id == that->id) { |
Sebastian Andrzej Siewior | 7d762e4 | 2016-09-09 18:08:23 +0200 | [diff] [blame] | 355 | hlist_add_head(&this->node, &uncore_unused_list); |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 356 | this = that; |
| 357 | break; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | this->refcnt++; |
| 362 | return this; |
| 363 | } |
| 364 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 365 | static int amd_uncore_cpu_starting(unsigned int cpu) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 366 | { |
| 367 | unsigned int eax, ebx, ecx, edx; |
| 368 | struct amd_uncore *uncore; |
| 369 | |
| 370 | if (amd_uncore_nb) { |
| 371 | uncore = *per_cpu_ptr(amd_uncore_nb, cpu); |
| 372 | cpuid(0x8000001e, &eax, &ebx, &ecx, &edx); |
| 373 | uncore->id = ecx & 0xff; |
| 374 | |
| 375 | uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_nb); |
| 376 | *per_cpu_ptr(amd_uncore_nb, cpu) = uncore; |
| 377 | } |
| 378 | |
| 379 | if (amd_uncore_l2) { |
| 380 | unsigned int apicid = cpu_data(cpu).apicid; |
| 381 | unsigned int nshared; |
| 382 | |
| 383 | uncore = *per_cpu_ptr(amd_uncore_l2, cpu); |
| 384 | cpuid_count(0x8000001d, 2, &eax, &ebx, &ecx, &edx); |
| 385 | nshared = ((eax >> 14) & 0xfff) + 1; |
| 386 | uncore->id = apicid - (apicid % nshared); |
| 387 | |
| 388 | uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_l2); |
| 389 | *per_cpu_ptr(amd_uncore_l2, cpu) = uncore; |
| 390 | } |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 391 | |
| 392 | return 0; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 393 | } |
| 394 | |
Sebastian Andrzej Siewior | 7d762e4 | 2016-09-09 18:08:23 +0200 | [diff] [blame] | 395 | static void uncore_clean_online(void) |
| 396 | { |
| 397 | struct amd_uncore *uncore; |
| 398 | struct hlist_node *n; |
| 399 | |
| 400 | hlist_for_each_entry_safe(uncore, n, &uncore_unused_list, node) { |
| 401 | hlist_del(&uncore->node); |
| 402 | kfree(uncore); |
| 403 | } |
| 404 | } |
| 405 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 406 | static void uncore_online(unsigned int cpu, |
| 407 | struct amd_uncore * __percpu *uncores) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 408 | { |
| 409 | struct amd_uncore *uncore = *per_cpu_ptr(uncores, cpu); |
| 410 | |
Sebastian Andrzej Siewior | 7d762e4 | 2016-09-09 18:08:23 +0200 | [diff] [blame] | 411 | uncore_clean_online(); |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 412 | |
| 413 | if (cpu == uncore->cpu) |
| 414 | cpumask_set_cpu(cpu, uncore->active_mask); |
| 415 | } |
| 416 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 417 | static int amd_uncore_cpu_online(unsigned int cpu) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 418 | { |
| 419 | if (amd_uncore_nb) |
| 420 | uncore_online(cpu, amd_uncore_nb); |
| 421 | |
| 422 | if (amd_uncore_l2) |
| 423 | uncore_online(cpu, amd_uncore_l2); |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 424 | |
| 425 | return 0; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 426 | } |
| 427 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 428 | static void uncore_down_prepare(unsigned int cpu, |
| 429 | struct amd_uncore * __percpu *uncores) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 430 | { |
| 431 | unsigned int i; |
| 432 | struct amd_uncore *this = *per_cpu_ptr(uncores, cpu); |
| 433 | |
| 434 | if (this->cpu != cpu) |
| 435 | return; |
| 436 | |
| 437 | /* this cpu is going down, migrate to a shared sibling if possible */ |
| 438 | for_each_online_cpu(i) { |
| 439 | struct amd_uncore *that = *per_cpu_ptr(uncores, i); |
| 440 | |
| 441 | if (cpu == i) |
| 442 | continue; |
| 443 | |
| 444 | if (this == that) { |
| 445 | perf_pmu_migrate_context(this->pmu, cpu, i); |
| 446 | cpumask_clear_cpu(cpu, that->active_mask); |
| 447 | cpumask_set_cpu(i, that->active_mask); |
| 448 | that->cpu = i; |
| 449 | break; |
| 450 | } |
| 451 | } |
| 452 | } |
| 453 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 454 | static int amd_uncore_cpu_down_prepare(unsigned int cpu) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 455 | { |
| 456 | if (amd_uncore_nb) |
| 457 | uncore_down_prepare(cpu, amd_uncore_nb); |
| 458 | |
| 459 | if (amd_uncore_l2) |
| 460 | uncore_down_prepare(cpu, amd_uncore_l2); |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 461 | |
| 462 | return 0; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 463 | } |
| 464 | |
Paul Gortmaker | 148f9bb | 2013-06-18 18:23:59 -0400 | [diff] [blame] | 465 | static void uncore_dead(unsigned int cpu, struct amd_uncore * __percpu *uncores) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 466 | { |
| 467 | struct amd_uncore *uncore = *per_cpu_ptr(uncores, cpu); |
| 468 | |
| 469 | if (cpu == uncore->cpu) |
| 470 | cpumask_clear_cpu(cpu, uncore->active_mask); |
| 471 | |
| 472 | if (!--uncore->refcnt) |
| 473 | kfree(uncore); |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 474 | *per_cpu_ptr(uncores, cpu) = NULL; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 475 | } |
| 476 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 477 | static int amd_uncore_cpu_dead(unsigned int cpu) |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 478 | { |
| 479 | if (amd_uncore_nb) |
| 480 | uncore_dead(cpu, amd_uncore_nb); |
| 481 | |
| 482 | if (amd_uncore_l2) |
| 483 | uncore_dead(cpu, amd_uncore_l2); |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 484 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 485 | return 0; |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 486 | } |
| 487 | |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 488 | static int __init amd_uncore_init(void) |
| 489 | { |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 490 | int ret = -ENODEV; |
| 491 | |
| 492 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 493 | goto fail_nodev; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 494 | |
Borislav Petkov | 362f924 | 2015-12-07 10:39:41 +0100 | [diff] [blame] | 495 | if (!boot_cpu_has(X86_FEATURE_TOPOEXT)) |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 496 | goto fail_nodev; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 497 | |
Borislav Petkov | 362f924 | 2015-12-07 10:39:41 +0100 | [diff] [blame] | 498 | if (boot_cpu_has(X86_FEATURE_PERFCTR_NB)) { |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 499 | amd_uncore_nb = alloc_percpu(struct amd_uncore *); |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 500 | if (!amd_uncore_nb) { |
| 501 | ret = -ENOMEM; |
| 502 | goto fail_nb; |
| 503 | } |
| 504 | ret = perf_pmu_register(&amd_nb_pmu, amd_nb_pmu.name, -1); |
| 505 | if (ret) |
| 506 | goto fail_nb; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 507 | |
Chen Yucong | 1b74dde | 2016-02-02 11:45:02 +0800 | [diff] [blame] | 508 | pr_info("perf: AMD NB counters detected\n"); |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 509 | ret = 0; |
| 510 | } |
| 511 | |
Borislav Petkov | 362f924 | 2015-12-07 10:39:41 +0100 | [diff] [blame] | 512 | if (boot_cpu_has(X86_FEATURE_PERFCTR_L2)) { |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 513 | amd_uncore_l2 = alloc_percpu(struct amd_uncore *); |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 514 | if (!amd_uncore_l2) { |
| 515 | ret = -ENOMEM; |
| 516 | goto fail_l2; |
| 517 | } |
| 518 | ret = perf_pmu_register(&amd_l2_pmu, amd_l2_pmu.name, -1); |
| 519 | if (ret) |
| 520 | goto fail_l2; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 521 | |
Chen Yucong | 1b74dde | 2016-02-02 11:45:02 +0800 | [diff] [blame] | 522 | pr_info("perf: AMD L2I counters detected\n"); |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 523 | ret = 0; |
| 524 | } |
| 525 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 526 | /* |
| 527 | * Install callbacks. Core will call them for each online cpu. |
| 528 | */ |
| 529 | if (cpuhp_setup_state(CPUHP_PERF_X86_AMD_UNCORE_PREP, |
| 530 | "PERF_X86_AMD_UNCORE_PREP", |
| 531 | amd_uncore_cpu_up_prepare, amd_uncore_cpu_dead)) |
| 532 | goto fail_l2; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 533 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 534 | if (cpuhp_setup_state(CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, |
| 535 | "AP_PERF_X86_AMD_UNCORE_STARTING", |
| 536 | amd_uncore_cpu_starting, NULL)) |
| 537 | goto fail_prep; |
| 538 | if (cpuhp_setup_state(CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, |
| 539 | "AP_PERF_X86_AMD_UNCORE_ONLINE", |
| 540 | amd_uncore_cpu_online, |
| 541 | amd_uncore_cpu_down_prepare)) |
| 542 | goto fail_start; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 543 | return 0; |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 544 | |
Richard Cochran | 96b2bd3 | 2016-07-13 17:16:13 +0000 | [diff] [blame] | 545 | fail_start: |
| 546 | cpuhp_remove_state(CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING); |
| 547 | fail_prep: |
| 548 | cpuhp_remove_state(CPUHP_PERF_X86_AMD_UNCORE_PREP); |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 549 | fail_l2: |
Borislav Petkov | 362f924 | 2015-12-07 10:39:41 +0100 | [diff] [blame] | 550 | if (boot_cpu_has(X86_FEATURE_PERFCTR_NB)) |
Zhouyi Zhou | 503d329 | 2014-06-11 12:09:03 +0800 | [diff] [blame] | 551 | perf_pmu_unregister(&amd_nb_pmu); |
| 552 | if (amd_uncore_l2) |
| 553 | free_percpu(amd_uncore_l2); |
| 554 | fail_nb: |
| 555 | if (amd_uncore_nb) |
| 556 | free_percpu(amd_uncore_nb); |
| 557 | |
| 558 | fail_nodev: |
| 559 | return ret; |
Jacob Shin | c43ca50 | 2013-04-19 16:34:28 -0500 | [diff] [blame] | 560 | } |
| 561 | device_initcall(amd_uncore_init); |