Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/mutex.h> |
| 20 | #include <linux/cpu.h> |
| 21 | #include <linux/of.h> |
| 22 | #include <linux/hrtimer.h> |
| 23 | #include <linux/ktime.h> |
| 24 | #include <linux/tick.h> |
| 25 | #include <linux/suspend.h> |
| 26 | #include <linux/pm_qos.h> |
| 27 | #include <linux/of_platform.h> |
| 28 | #include <linux/smp.h> |
| 29 | #include <linux/remote_spinlock.h> |
| 30 | #include <linux/msm_remote_spinlock.h> |
| 31 | #include <linux/dma-mapping.h> |
| 32 | #include <linux/coresight-cti.h> |
| 33 | #include <linux/moduleparam.h> |
| 34 | #include <linux/sched.h> |
| 35 | #include <linux/cpu_pm.h> |
| 36 | #include <soc/qcom/spm.h> |
| 37 | #include <soc/qcom/pm-legacy.h> |
| 38 | #include <soc/qcom/rpm-notifier.h> |
| 39 | #include <soc/qcom/event_timer.h> |
| 40 | #include <soc/qcom/lpm-stats.h> |
| 41 | #include <soc/qcom/lpm_levels.h> |
| 42 | #include <soc/qcom/jtag.h> |
| 43 | #include <asm/cputype.h> |
| 44 | #include <asm/arch_timer.h> |
| 45 | #include <asm/cacheflush.h> |
| 46 | #include <asm/suspend.h> |
| 47 | #include "lpm-levels-legacy.h" |
| 48 | #include "lpm-workarounds.h" |
| 49 | #include <trace/events/power.h> |
| 50 | #define CREATE_TRACE_POINTS |
| 51 | #include <trace/events/trace_msm_low_power.h> |
| 52 | #if defined(CONFIG_COMMON_CLK) |
| 53 | #include "../clk/clk.h" |
| 54 | #elif defined(CONFIG_COMMON_CLK_MSM) |
| 55 | #include "../../drivers/clk/msm/clock.h" |
| 56 | #endif /* CONFIG_COMMON_CLK */ |
| 57 | #include <soc/qcom/minidump.h> |
| 58 | |
| 59 | #define SCLK_HZ (32768) |
| 60 | #define SCM_HANDOFF_LOCK_ID "S:7" |
| 61 | #define PSCI_POWER_STATE(reset) (reset << 30) |
| 62 | #define PSCI_AFFINITY_LEVEL(lvl) ((lvl & 0x3) << 24) |
| 63 | static remote_spinlock_t scm_handoff_lock; |
| 64 | |
| 65 | enum { |
| 66 | MSM_LPM_LVL_DBG_SUSPEND_LIMITS = BIT(0), |
| 67 | MSM_LPM_LVL_DBG_IDLE_LIMITS = BIT(1), |
| 68 | }; |
| 69 | |
| 70 | enum debug_event { |
| 71 | CPU_ENTER, |
| 72 | CPU_EXIT, |
| 73 | CLUSTER_ENTER, |
| 74 | CLUSTER_EXIT, |
| 75 | PRE_PC_CB, |
| 76 | CPU_HP_STARTING, |
| 77 | CPU_HP_DYING, |
| 78 | }; |
| 79 | |
| 80 | struct lpm_debug { |
| 81 | cycle_t time; |
| 82 | enum debug_event evt; |
| 83 | int cpu; |
| 84 | uint32_t arg1; |
| 85 | uint32_t arg2; |
| 86 | uint32_t arg3; |
| 87 | uint32_t arg4; |
| 88 | }; |
| 89 | |
| 90 | static struct system_pm_ops *sys_pm_ops; |
| 91 | struct lpm_cluster *lpm_root_node; |
| 92 | |
| 93 | static DEFINE_PER_CPU(struct lpm_cluster*, cpu_cluster); |
| 94 | static bool suspend_in_progress; |
| 95 | static struct hrtimer lpm_hrtimer; |
| 96 | static struct lpm_debug *lpm_debug; |
| 97 | static phys_addr_t lpm_debug_phys; |
| 98 | |
| 99 | static const int num_dbg_elements = 0x100; |
| 100 | |
| 101 | static void cluster_unprepare(struct lpm_cluster *cluster, |
| 102 | const struct cpumask *cpu, int child_idx, bool from_idle, |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 103 | int64_t time, bool success); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 104 | static void cluster_prepare(struct lpm_cluster *cluster, |
| 105 | const struct cpumask *cpu, int child_idx, bool from_idle, |
| 106 | int64_t time); |
| 107 | |
| 108 | static bool menu_select; |
| 109 | module_param_named( |
| 110 | menu_select, menu_select, bool, 0664 |
| 111 | ); |
| 112 | |
| 113 | static bool print_parsed_dt; |
| 114 | module_param_named( |
| 115 | print_parsed_dt, print_parsed_dt, bool, 0664 |
| 116 | ); |
| 117 | |
| 118 | static bool sleep_disabled; |
| 119 | module_param_named(sleep_disabled, |
| 120 | sleep_disabled, bool, 0664); |
| 121 | |
| 122 | s32 msm_cpuidle_get_deep_idle_latency(void) |
| 123 | { |
| 124 | return 10; |
| 125 | } |
| 126 | EXPORT_SYMBOL(msm_cpuidle_get_deep_idle_latency); |
| 127 | |
| 128 | uint32_t register_system_pm_ops(struct system_pm_ops *pm_ops) |
| 129 | { |
| 130 | if (sys_pm_ops) |
| 131 | return -EUSERS; |
| 132 | |
| 133 | sys_pm_ops = pm_ops; |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static uint32_t least_cluster_latency(struct lpm_cluster *cluster, |
| 139 | struct latency_level *lat_level) |
| 140 | { |
| 141 | struct list_head *list; |
| 142 | struct lpm_cluster_level *level; |
| 143 | struct lpm_cluster *n; |
| 144 | struct power_params *pwr_params; |
| 145 | uint32_t latency = 0; |
| 146 | int i; |
| 147 | |
| 148 | if (!cluster->list.next) { |
| 149 | for (i = 0; i < cluster->nlevels; i++) { |
| 150 | level = &cluster->levels[i]; |
| 151 | pwr_params = &level->pwr; |
| 152 | if (lat_level->reset_level == level->reset_level) { |
| 153 | if ((latency > pwr_params->latency_us) |
| 154 | || (!latency)) |
| 155 | latency = pwr_params->latency_us; |
| 156 | break; |
| 157 | } |
| 158 | } |
| 159 | } else { |
| 160 | list_for_each(list, &cluster->parent->child) { |
| 161 | n = list_entry(list, typeof(*n), list); |
| 162 | if (lat_level->level_name) { |
| 163 | if (strcmp(lat_level->level_name, |
| 164 | n->cluster_name)) |
| 165 | continue; |
| 166 | } |
| 167 | for (i = 0; i < n->nlevels; i++) { |
| 168 | level = &n->levels[i]; |
| 169 | pwr_params = &level->pwr; |
| 170 | if (lat_level->reset_level == |
| 171 | level->reset_level) { |
| 172 | if ((latency > pwr_params->latency_us) |
| 173 | || (!latency)) |
| 174 | latency = |
| 175 | pwr_params->latency_us; |
| 176 | break; |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | return latency; |
| 182 | } |
| 183 | |
| 184 | static uint32_t least_cpu_latency(struct list_head *child, |
| 185 | struct latency_level *lat_level) |
| 186 | { |
| 187 | struct list_head *list; |
| 188 | struct lpm_cpu_level *level; |
| 189 | struct power_params *pwr_params; |
| 190 | struct lpm_cpu *cpu; |
| 191 | struct lpm_cluster *n; |
| 192 | uint32_t latency = 0; |
| 193 | int i; |
| 194 | |
| 195 | list_for_each(list, child) { |
| 196 | n = list_entry(list, typeof(*n), list); |
| 197 | if (lat_level->level_name) { |
| 198 | if (strcmp(lat_level->level_name, n->cluster_name)) |
| 199 | continue; |
| 200 | } |
| 201 | cpu = n->cpu; |
| 202 | for (i = 0; i < cpu->nlevels; i++) { |
| 203 | level = &cpu->levels[i]; |
| 204 | pwr_params = &level->pwr; |
| 205 | if (lat_level->reset_level == level->reset_level) { |
| 206 | if ((latency > pwr_params->latency_us) |
| 207 | || (!latency)) |
| 208 | latency = pwr_params->latency_us; |
| 209 | break; |
| 210 | } |
| 211 | } |
| 212 | } |
| 213 | return latency; |
| 214 | } |
| 215 | |
| 216 | static struct lpm_cluster *cluster_aff_match(struct lpm_cluster *cluster, |
| 217 | int affinity_level) |
| 218 | { |
| 219 | struct lpm_cluster *n; |
| 220 | |
| 221 | if ((cluster->aff_level == affinity_level) |
| 222 | || ((cluster->cpu) && (affinity_level == 0))) |
| 223 | return cluster; |
| 224 | else if (!cluster->cpu) { |
| 225 | n = list_entry(cluster->child.next, typeof(*n), list); |
| 226 | return cluster_aff_match(n, affinity_level); |
| 227 | } else |
| 228 | return NULL; |
| 229 | } |
| 230 | |
| 231 | int lpm_get_latency(struct latency_level *level, uint32_t *latency) |
| 232 | { |
| 233 | struct lpm_cluster *cluster; |
| 234 | uint32_t val; |
| 235 | |
| 236 | if (!lpm_root_node) { |
| 237 | pr_err("%s: lpm_probe not completed\n", __func__); |
| 238 | return -EAGAIN; |
| 239 | } |
| 240 | |
| 241 | if ((level->affinity_level < 0) |
| 242 | || (level->affinity_level > lpm_root_node->aff_level) |
| 243 | || (level->reset_level < LPM_RESET_LVL_RET) |
| 244 | || (level->reset_level > LPM_RESET_LVL_PC) |
| 245 | || !latency) |
| 246 | return -EINVAL; |
| 247 | |
| 248 | cluster = cluster_aff_match(lpm_root_node, level->affinity_level); |
| 249 | if (!cluster) { |
| 250 | pr_err("%s:No matching cluster found for affinity_level:%d\n", |
| 251 | __func__, level->affinity_level); |
| 252 | return -EINVAL; |
| 253 | } |
| 254 | |
| 255 | if (level->affinity_level == 0) |
| 256 | val = least_cpu_latency(&cluster->parent->child, level); |
| 257 | else |
| 258 | val = least_cluster_latency(cluster, level); |
| 259 | |
| 260 | if (!val) { |
| 261 | pr_err("%s:No mode with affinity_level:%d reset_level:%d\n", |
| 262 | __func__, level->affinity_level, level->reset_level); |
| 263 | return -EINVAL; |
| 264 | } |
| 265 | |
| 266 | *latency = val; |
| 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | EXPORT_SYMBOL(lpm_get_latency); |
| 271 | |
| 272 | static void update_debug_pc_event(enum debug_event event, uint32_t arg1, |
| 273 | uint32_t arg2, uint32_t arg3, uint32_t arg4) |
| 274 | { |
| 275 | struct lpm_debug *dbg; |
| 276 | int idx; |
| 277 | static DEFINE_SPINLOCK(debug_lock); |
| 278 | static int pc_event_index; |
| 279 | |
| 280 | if (!lpm_debug) |
| 281 | return; |
| 282 | |
| 283 | spin_lock(&debug_lock); |
| 284 | idx = pc_event_index++; |
| 285 | dbg = &lpm_debug[idx & (num_dbg_elements - 1)]; |
| 286 | |
| 287 | dbg->evt = event; |
| 288 | dbg->time = arch_counter_get_cntpct(); |
| 289 | dbg->cpu = raw_smp_processor_id(); |
| 290 | dbg->arg1 = arg1; |
| 291 | dbg->arg2 = arg2; |
| 292 | dbg->arg3 = arg3; |
| 293 | dbg->arg4 = arg4; |
| 294 | spin_unlock(&debug_lock); |
| 295 | } |
| 296 | |
| 297 | static enum hrtimer_restart lpm_hrtimer_cb(struct hrtimer *h) |
| 298 | { |
| 299 | return HRTIMER_NORESTART; |
| 300 | } |
| 301 | |
| 302 | static void msm_pm_set_timer(uint32_t modified_time_us) |
| 303 | { |
| 304 | u64 modified_time_ns = modified_time_us * NSEC_PER_USEC; |
| 305 | ktime_t modified_ktime = ns_to_ktime(modified_time_ns); |
| 306 | |
| 307 | lpm_hrtimer.function = lpm_hrtimer_cb; |
| 308 | hrtimer_start(&lpm_hrtimer, modified_ktime, HRTIMER_MODE_REL_PINNED); |
| 309 | } |
| 310 | |
| 311 | int set_l2_mode(struct low_power_ops *ops, int mode, |
| 312 | struct lpm_cluster_level *level) |
| 313 | { |
| 314 | int lpm = mode; |
| 315 | int rc = 0; |
| 316 | bool notify_rpm = level->notify_rpm; |
| 317 | struct low_power_ops *cpu_ops = per_cpu(cpu_cluster, |
| 318 | smp_processor_id())->lpm_dev; |
| 319 | |
| 320 | if (cpu_ops->tz_flag & MSM_SCM_L2_OFF || |
| 321 | cpu_ops->tz_flag & MSM_SCM_L2_GDHS) |
| 322 | coresight_cti_ctx_restore(); |
| 323 | |
| 324 | switch (mode) { |
| 325 | case MSM_SPM_MODE_STANDALONE_POWER_COLLAPSE: |
| 326 | case MSM_SPM_MODE_POWER_COLLAPSE: |
| 327 | case MSM_SPM_MODE_FASTPC: |
| 328 | if (level->no_cache_flush) |
| 329 | cpu_ops->tz_flag = MSM_SCM_L2_GDHS; |
| 330 | else |
| 331 | cpu_ops->tz_flag = MSM_SCM_L2_OFF; |
| 332 | coresight_cti_ctx_save(); |
| 333 | break; |
| 334 | case MSM_SPM_MODE_GDHS: |
| 335 | cpu_ops->tz_flag = MSM_SCM_L2_GDHS; |
| 336 | coresight_cti_ctx_save(); |
| 337 | break; |
| 338 | case MSM_SPM_MODE_CLOCK_GATING: |
| 339 | case MSM_SPM_MODE_RETENTION: |
| 340 | case MSM_SPM_MODE_DISABLED: |
| 341 | cpu_ops->tz_flag = MSM_SCM_L2_ON; |
| 342 | break; |
| 343 | default: |
| 344 | cpu_ops->tz_flag = MSM_SCM_L2_ON; |
| 345 | lpm = MSM_SPM_MODE_DISABLED; |
| 346 | break; |
| 347 | } |
| 348 | |
Anil Kumar Mamidala | 3b23717 | 2016-03-30 20:45:33 +0530 | [diff] [blame] | 349 | if (lpm_wa_get_skip_l2_spm()) |
| 350 | rc = msm_spm_config_low_power_mode_addr(ops->spm, lpm, |
| 351 | notify_rpm); |
| 352 | else |
| 353 | rc = msm_spm_config_low_power_mode(ops->spm, lpm, notify_rpm); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 354 | |
| 355 | if (rc) |
| 356 | pr_err("%s: Failed to set L2 low power mode %d, ERR %d", |
| 357 | __func__, lpm, rc); |
| 358 | |
| 359 | return rc; |
| 360 | } |
| 361 | |
| 362 | int set_l3_mode(struct low_power_ops *ops, int mode, |
| 363 | struct lpm_cluster_level *level) |
| 364 | { |
| 365 | bool notify_rpm = level->notify_rpm; |
| 366 | struct low_power_ops *cpu_ops = per_cpu(cpu_cluster, |
| 367 | smp_processor_id())->lpm_dev; |
| 368 | |
| 369 | switch (mode) { |
| 370 | case MSM_SPM_MODE_STANDALONE_POWER_COLLAPSE: |
| 371 | case MSM_SPM_MODE_POWER_COLLAPSE: |
| 372 | case MSM_SPM_MODE_FASTPC: |
| 373 | cpu_ops->tz_flag |= MSM_SCM_L3_PC_OFF; |
| 374 | break; |
| 375 | default: |
| 376 | break; |
| 377 | } |
| 378 | return msm_spm_config_low_power_mode(ops->spm, mode, notify_rpm); |
| 379 | } |
| 380 | |
| 381 | |
| 382 | int set_system_mode(struct low_power_ops *ops, int mode, |
| 383 | struct lpm_cluster_level *level) |
| 384 | { |
| 385 | bool notify_rpm = level->notify_rpm; |
| 386 | |
| 387 | return msm_spm_config_low_power_mode(ops->spm, mode, notify_rpm); |
| 388 | } |
| 389 | |
| 390 | static int set_device_mode(struct lpm_cluster *cluster, int ndevice, |
| 391 | struct lpm_cluster_level *level) |
| 392 | { |
| 393 | struct low_power_ops *ops; |
| 394 | |
| 395 | if (use_psci) |
| 396 | return 0; |
| 397 | |
| 398 | ops = &cluster->lpm_dev[ndevice]; |
| 399 | if (ops && ops->set_mode) |
| 400 | return ops->set_mode(ops, level->mode[ndevice], |
| 401 | level); |
| 402 | else |
| 403 | return -EINVAL; |
| 404 | } |
| 405 | |
| 406 | static int cpu_power_select(struct cpuidle_device *dev, |
| 407 | struct lpm_cpu *cpu) |
| 408 | { |
| 409 | int best_level = 0; |
| 410 | uint32_t latency_us = pm_qos_request_for_cpu(PM_QOS_CPU_DMA_LATENCY, |
| 411 | dev->cpu); |
| 412 | s64 sleep_us = ktime_to_us(tick_nohz_get_sleep_length()); |
| 413 | uint32_t modified_time_us = 0; |
| 414 | uint32_t next_event_us = 0; |
| 415 | int i; |
| 416 | uint32_t lvl_latency_us = 0; |
| 417 | uint32_t *residency = get_per_cpu_max_residency(dev->cpu); |
| 418 | |
| 419 | if (!cpu) |
| 420 | return best_level; |
| 421 | |
| 422 | if ((sleep_disabled && !cpu_isolated(dev->cpu)) || sleep_us < 0) |
| 423 | return 0; |
| 424 | |
| 425 | next_event_us = (uint32_t)(ktime_to_us(get_next_event_time(dev->cpu))); |
| 426 | |
| 427 | for (i = 0; i < cpu->nlevels; i++) { |
| 428 | struct lpm_cpu_level *level = &cpu->levels[i]; |
| 429 | struct power_params *pwr_params = &level->pwr; |
| 430 | uint32_t next_wakeup_us = (uint32_t)sleep_us; |
| 431 | enum msm_pm_sleep_mode mode = level->mode; |
| 432 | bool allow; |
| 433 | |
| 434 | allow = lpm_cpu_mode_allow(dev->cpu, i, true); |
| 435 | |
| 436 | if (!allow) |
| 437 | continue; |
| 438 | |
| 439 | lvl_latency_us = pwr_params->latency_us; |
| 440 | |
| 441 | if (latency_us < lvl_latency_us) |
| 442 | break; |
| 443 | |
| 444 | if (next_event_us) { |
| 445 | if (next_event_us < lvl_latency_us) |
| 446 | break; |
| 447 | |
| 448 | if (((next_event_us - lvl_latency_us) < sleep_us) || |
| 449 | (next_event_us < sleep_us)) |
| 450 | next_wakeup_us = next_event_us - lvl_latency_us; |
| 451 | } |
| 452 | |
| 453 | best_level = i; |
| 454 | |
| 455 | if (next_event_us && next_event_us < sleep_us && |
| 456 | (mode != MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT)) |
| 457 | modified_time_us |
| 458 | = next_event_us - lvl_latency_us; |
| 459 | else |
| 460 | modified_time_us = 0; |
| 461 | |
| 462 | if (next_wakeup_us <= residency[i]) |
| 463 | break; |
| 464 | } |
| 465 | |
| 466 | if (modified_time_us) |
| 467 | msm_pm_set_timer(modified_time_us); |
| 468 | |
| 469 | trace_cpu_power_select(best_level, sleep_us, latency_us, next_event_us); |
| 470 | |
| 471 | return best_level; |
| 472 | } |
| 473 | |
| 474 | static uint64_t get_cluster_sleep_time(struct lpm_cluster *cluster, |
| 475 | struct cpumask *mask, bool from_idle) |
| 476 | { |
| 477 | int cpu; |
| 478 | int next_cpu = raw_smp_processor_id(); |
| 479 | ktime_t next_event; |
| 480 | struct cpumask online_cpus_in_cluster; |
| 481 | |
| 482 | next_event.tv64 = KTIME_MAX; |
| 483 | if (!from_idle) { |
| 484 | if (mask) |
| 485 | cpumask_copy(mask, cpumask_of(raw_smp_processor_id())); |
| 486 | return ~0ULL; |
| 487 | } |
| 488 | |
| 489 | cpumask_and(&online_cpus_in_cluster, |
| 490 | &cluster->num_children_in_sync, cpu_online_mask); |
| 491 | |
| 492 | for_each_cpu(cpu, &online_cpus_in_cluster) { |
| 493 | ktime_t *next_event_c; |
| 494 | |
| 495 | next_event_c = get_next_event_cpu(cpu); |
| 496 | if (next_event_c->tv64 < next_event.tv64) { |
| 497 | next_event.tv64 = next_event_c->tv64; |
| 498 | next_cpu = cpu; |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | if (mask) |
| 503 | cpumask_copy(mask, cpumask_of(next_cpu)); |
| 504 | |
| 505 | |
| 506 | if (ktime_to_us(next_event) > ktime_to_us(ktime_get())) |
| 507 | return ktime_to_us(ktime_sub(next_event, ktime_get())); |
| 508 | else |
| 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | static int cluster_select(struct lpm_cluster *cluster, bool from_idle) |
| 513 | { |
| 514 | int best_level = -1; |
| 515 | int i; |
| 516 | struct cpumask mask; |
| 517 | uint32_t latency_us = ~0U; |
| 518 | uint32_t sleep_us; |
| 519 | |
| 520 | if (!cluster) |
| 521 | return -EINVAL; |
| 522 | |
| 523 | sleep_us = (uint32_t)get_cluster_sleep_time(cluster, NULL, from_idle); |
| 524 | |
| 525 | if (cpumask_and(&mask, cpu_online_mask, &cluster->child_cpus)) |
| 526 | latency_us = pm_qos_request_for_cpumask(PM_QOS_CPU_DMA_LATENCY, |
| 527 | &mask); |
| 528 | |
| 529 | /* |
| 530 | * If atleast one of the core in the cluster is online, the cluster |
| 531 | * low power modes should be determined by the idle characteristics |
| 532 | * even if the last core enters the low power mode as a part of |
| 533 | * hotplug. |
| 534 | */ |
| 535 | |
| 536 | if (!from_idle && num_online_cpus() > 1 && |
| 537 | cpumask_intersects(&cluster->child_cpus, cpu_online_mask)) |
| 538 | from_idle = true; |
| 539 | |
| 540 | for (i = 0; i < cluster->nlevels; i++) { |
| 541 | struct lpm_cluster_level *level = &cluster->levels[i]; |
| 542 | struct power_params *pwr_params = &level->pwr; |
| 543 | |
| 544 | if (!lpm_cluster_mode_allow(cluster, i, from_idle)) |
| 545 | continue; |
| 546 | |
| 547 | if (level->last_core_only && |
| 548 | cpumask_weight(cpu_online_mask) > 1) |
| 549 | continue; |
| 550 | |
| 551 | if (!cpumask_equal(&cluster->num_children_in_sync, |
| 552 | &level->num_cpu_votes)) |
| 553 | continue; |
| 554 | |
| 555 | if (from_idle && latency_us < pwr_params->latency_us) |
| 556 | break; |
| 557 | |
| 558 | if (sleep_us < pwr_params->time_overhead_us) |
| 559 | break; |
| 560 | |
| 561 | if (suspend_in_progress && from_idle && level->notify_rpm) |
| 562 | continue; |
| 563 | |
| 564 | if (level->notify_rpm) { |
| 565 | if (!(sys_pm_ops && sys_pm_ops->sleep_allowed)) |
| 566 | continue; |
| 567 | if (!sys_pm_ops->sleep_allowed()) |
| 568 | continue; |
| 569 | } |
| 570 | |
| 571 | best_level = i; |
| 572 | |
| 573 | if (from_idle && sleep_us <= pwr_params->max_residency) |
| 574 | break; |
| 575 | } |
| 576 | |
| 577 | return best_level; |
| 578 | } |
| 579 | |
| 580 | static void cluster_notify(struct lpm_cluster *cluster, |
| 581 | struct lpm_cluster_level *level, bool enter) |
| 582 | { |
| 583 | if (level->is_reset && enter) |
| 584 | cpu_cluster_pm_enter(cluster->aff_level); |
| 585 | else if (level->is_reset && !enter) |
| 586 | cpu_cluster_pm_exit(cluster->aff_level); |
| 587 | } |
| 588 | |
| 589 | static unsigned int get_next_online_cpu(bool from_idle) |
| 590 | { |
| 591 | unsigned int cpu; |
| 592 | ktime_t next_event; |
| 593 | unsigned int next_cpu = raw_smp_processor_id(); |
| 594 | |
| 595 | if (!from_idle) |
| 596 | return next_cpu; |
| 597 | next_event.tv64 = KTIME_MAX; |
| 598 | for_each_online_cpu(cpu) { |
| 599 | ktime_t *next_event_c; |
| 600 | |
| 601 | next_event_c = get_next_event_cpu(cpu); |
| 602 | if (next_event_c->tv64 < next_event.tv64) { |
| 603 | next_event.tv64 = next_event_c->tv64; |
| 604 | next_cpu = cpu; |
| 605 | } |
| 606 | } |
| 607 | return next_cpu; |
| 608 | } |
| 609 | |
| 610 | static int cluster_configure(struct lpm_cluster *cluster, int idx, |
| 611 | bool from_idle) |
| 612 | { |
| 613 | struct lpm_cluster_level *level = &cluster->levels[idx]; |
| 614 | struct cpumask cpumask; |
| 615 | unsigned int cpu; |
| 616 | int ret, i; |
| 617 | |
| 618 | if (!cpumask_equal(&cluster->num_children_in_sync, &cluster->child_cpus) |
| 619 | || is_IPI_pending(&cluster->num_children_in_sync)) { |
| 620 | return -EPERM; |
| 621 | } |
| 622 | |
| 623 | if (idx != cluster->default_level) { |
| 624 | update_debug_pc_event(CLUSTER_ENTER, idx, |
| 625 | cluster->num_children_in_sync.bits[0], |
| 626 | cluster->child_cpus.bits[0], from_idle); |
| 627 | trace_cluster_enter(cluster->cluster_name, idx, |
| 628 | cluster->num_children_in_sync.bits[0], |
| 629 | cluster->child_cpus.bits[0], from_idle); |
| 630 | lpm_stats_cluster_enter(cluster->stats, idx); |
| 631 | } |
| 632 | |
| 633 | for (i = 0; i < cluster->ndevices; i++) { |
| 634 | ret = set_device_mode(cluster, i, level); |
| 635 | if (ret) |
| 636 | goto failed_set_mode; |
| 637 | } |
| 638 | |
| 639 | if (level->notify_rpm) { |
| 640 | struct cpumask *nextcpu; |
| 641 | |
| 642 | cpu = get_next_online_cpu(from_idle); |
| 643 | cpumask_copy(&cpumask, cpumask_of(cpu)); |
| 644 | nextcpu = level->disable_dynamic_routing ? NULL : &cpumask; |
| 645 | |
Raghavendra Kakarla | 63d9cd1 | 2018-06-26 19:33:58 +0530 | [diff] [blame] | 646 | if (sys_pm_ops && sys_pm_ops->enter) { |
| 647 | ret = sys_pm_ops->enter(nextcpu); |
| 648 | if (ret) |
| 649 | goto failed_set_mode; |
| 650 | } |
Maulik Shah | 735e1e7 | 2016-08-01 12:11:13 +0530 | [diff] [blame] | 651 | |
| 652 | if (cluster->no_saw_devices && !use_psci) |
| 653 | msm_spm_set_rpm_hs(true); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | /* Notify cluster enter event after successfully config completion */ |
| 657 | cluster_notify(cluster, level, true); |
| 658 | |
| 659 | cluster->last_level = idx; |
| 660 | return 0; |
| 661 | |
| 662 | failed_set_mode: |
| 663 | |
| 664 | for (i = 0; i < cluster->ndevices; i++) { |
| 665 | int rc = 0; |
| 666 | |
| 667 | level = &cluster->levels[cluster->default_level]; |
| 668 | rc = set_device_mode(cluster, i, level); |
| 669 | WARN_ON(rc); |
| 670 | } |
| 671 | return ret; |
| 672 | } |
| 673 | |
| 674 | static void cluster_prepare(struct lpm_cluster *cluster, |
| 675 | const struct cpumask *cpu, int child_idx, bool from_idle, |
| 676 | int64_t start_time) |
| 677 | { |
| 678 | int i; |
| 679 | |
| 680 | if (!cluster) |
| 681 | return; |
| 682 | |
| 683 | if (cluster->min_child_level > child_idx) |
| 684 | return; |
| 685 | |
| 686 | spin_lock(&cluster->sync_lock); |
| 687 | cpumask_or(&cluster->num_children_in_sync, cpu, |
| 688 | &cluster->num_children_in_sync); |
| 689 | |
| 690 | for (i = 0; i < cluster->nlevels; i++) { |
| 691 | struct lpm_cluster_level *lvl = &cluster->levels[i]; |
| 692 | |
| 693 | if (child_idx >= lvl->min_child_level) |
| 694 | cpumask_or(&lvl->num_cpu_votes, cpu, |
| 695 | &lvl->num_cpu_votes); |
| 696 | } |
| 697 | |
| 698 | /* |
| 699 | * cluster_select() does not make any configuration changes. So its ok |
| 700 | * to release the lock here. If a core wakes up for a rude request, |
| 701 | * it need not wait for another to finish its cluster selection and |
| 702 | * configuration process |
| 703 | */ |
| 704 | |
| 705 | if (!cpumask_equal(&cluster->num_children_in_sync, |
| 706 | &cluster->child_cpus)) |
| 707 | goto failed; |
| 708 | |
| 709 | i = cluster_select(cluster, from_idle); |
| 710 | |
| 711 | if (i < 0) |
| 712 | goto failed; |
| 713 | |
| 714 | if (cluster_configure(cluster, i, from_idle)) |
| 715 | goto failed; |
| 716 | |
| 717 | cluster->stats->sleep_time = start_time; |
| 718 | cluster_prepare(cluster->parent, &cluster->num_children_in_sync, i, |
| 719 | from_idle, start_time); |
| 720 | |
| 721 | spin_unlock(&cluster->sync_lock); |
| 722 | |
| 723 | if (!use_psci) { |
| 724 | struct lpm_cluster_level *level = &cluster->levels[i]; |
| 725 | |
| 726 | if (level->notify_rpm) |
| 727 | if (sys_pm_ops && sys_pm_ops->update_wakeup) |
| 728 | sys_pm_ops->update_wakeup(from_idle); |
| 729 | } |
| 730 | |
| 731 | return; |
| 732 | failed: |
| 733 | spin_unlock(&cluster->sync_lock); |
| 734 | cluster->stats->sleep_time = 0; |
| 735 | } |
| 736 | |
| 737 | static void cluster_unprepare(struct lpm_cluster *cluster, |
| 738 | const struct cpumask *cpu, int child_idx, bool from_idle, |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 739 | int64_t end_time, bool success) |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 740 | { |
| 741 | struct lpm_cluster_level *level; |
| 742 | bool first_cpu; |
| 743 | int last_level, i, ret; |
| 744 | |
| 745 | if (!cluster) |
| 746 | return; |
| 747 | |
| 748 | if (cluster->min_child_level > child_idx) |
| 749 | return; |
| 750 | |
| 751 | spin_lock(&cluster->sync_lock); |
| 752 | last_level = cluster->default_level; |
| 753 | first_cpu = cpumask_equal(&cluster->num_children_in_sync, |
| 754 | &cluster->child_cpus); |
| 755 | cpumask_andnot(&cluster->num_children_in_sync, |
| 756 | &cluster->num_children_in_sync, cpu); |
| 757 | |
| 758 | for (i = 0; i < cluster->nlevels; i++) { |
| 759 | struct lpm_cluster_level *lvl = &cluster->levels[i]; |
| 760 | |
| 761 | if (child_idx >= lvl->min_child_level) |
| 762 | cpumask_andnot(&lvl->num_cpu_votes, |
| 763 | &lvl->num_cpu_votes, cpu); |
| 764 | } |
| 765 | |
| 766 | if (!first_cpu || cluster->last_level == cluster->default_level) |
| 767 | goto unlock_return; |
| 768 | |
| 769 | if (cluster->stats->sleep_time) |
| 770 | cluster->stats->sleep_time = end_time - |
| 771 | cluster->stats->sleep_time; |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 772 | lpm_stats_cluster_exit(cluster->stats, cluster->last_level, success); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 773 | |
| 774 | level = &cluster->levels[cluster->last_level]; |
| 775 | if (level->notify_rpm) { |
| 776 | if (sys_pm_ops && sys_pm_ops->exit) |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 777 | sys_pm_ops->exit(success); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 778 | |
| 779 | /* If RPM bumps up CX to turbo, unvote CX turbo vote |
| 780 | * during exit of rpm assisted power collapse to |
| 781 | * reduce the power impact |
| 782 | */ |
| 783 | lpm_wa_cx_unvote_send(); |
| 784 | |
Maulik Shah | 735e1e7 | 2016-08-01 12:11:13 +0530 | [diff] [blame] | 785 | if (cluster->no_saw_devices && !use_psci) |
| 786 | msm_spm_set_rpm_hs(false); |
| 787 | |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 788 | } |
| 789 | |
| 790 | update_debug_pc_event(CLUSTER_EXIT, cluster->last_level, |
| 791 | cluster->num_children_in_sync.bits[0], |
| 792 | cluster->child_cpus.bits[0], from_idle); |
| 793 | trace_cluster_exit(cluster->cluster_name, cluster->last_level, |
| 794 | cluster->num_children_in_sync.bits[0], |
| 795 | cluster->child_cpus.bits[0], from_idle); |
| 796 | |
| 797 | last_level = cluster->last_level; |
| 798 | cluster->last_level = cluster->default_level; |
| 799 | |
| 800 | for (i = 0; i < cluster->ndevices; i++) { |
| 801 | level = &cluster->levels[cluster->default_level]; |
| 802 | ret = set_device_mode(cluster, i, level); |
| 803 | |
| 804 | WARN_ON(ret); |
| 805 | |
| 806 | } |
| 807 | |
| 808 | cluster_notify(cluster, &cluster->levels[last_level], false); |
| 809 | cluster_unprepare(cluster->parent, &cluster->child_cpus, |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 810 | last_level, from_idle, end_time, success); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 811 | unlock_return: |
| 812 | spin_unlock(&cluster->sync_lock); |
| 813 | } |
| 814 | |
| 815 | static inline void cpu_prepare(struct lpm_cluster *cluster, int cpu_index, |
| 816 | bool from_idle) |
| 817 | { |
| 818 | struct lpm_cpu_level *cpu_level = &cluster->cpu->levels[cpu_index]; |
| 819 | bool jtag_save_restore = |
| 820 | cluster->cpu->levels[cpu_index].jtag_save_restore; |
| 821 | |
| 822 | /* Use broadcast timer for aggregating sleep mode within a cluster. |
| 823 | * A broadcast timer could be used in the following scenarios |
| 824 | * 1) The architected timer HW gets reset during certain low power |
| 825 | * modes and the core relies on a external(broadcast) timer to wake up |
| 826 | * from sleep. This information is passed through device tree. |
| 827 | * 2) The CPU low power mode could trigger a system low power mode. |
| 828 | * The low power module relies on Broadcast timer to aggregate the |
| 829 | * next wakeup within a cluster, in which case, CPU switches over to |
| 830 | * use broadcast timer. |
| 831 | */ |
| 832 | if (from_idle && (cpu_level->use_bc_timer || |
| 833 | (cpu_index >= cluster->min_child_level))) |
| 834 | tick_broadcast_enter(); |
| 835 | |
| 836 | if (from_idle && ((cpu_level->mode == MSM_PM_SLEEP_MODE_POWER_COLLAPSE) |
| 837 | || (cpu_level->mode == |
| 838 | MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE) |
| 839 | || (cpu_level->is_reset))) |
| 840 | cpu_pm_enter(); |
| 841 | |
| 842 | /* |
| 843 | * Save JTAG registers for 8996v1.0 & 8996v2.x in C4 LPM |
| 844 | */ |
| 845 | if (jtag_save_restore) |
| 846 | msm_jtag_save_state(); |
| 847 | } |
| 848 | |
| 849 | static inline void cpu_unprepare(struct lpm_cluster *cluster, int cpu_index, |
| 850 | bool from_idle) |
| 851 | { |
| 852 | struct lpm_cpu_level *cpu_level = &cluster->cpu->levels[cpu_index]; |
| 853 | bool jtag_save_restore = |
| 854 | cluster->cpu->levels[cpu_index].jtag_save_restore; |
| 855 | |
| 856 | if (from_idle && (cpu_level->use_bc_timer || |
| 857 | (cpu_index >= cluster->min_child_level))) |
| 858 | tick_broadcast_exit(); |
| 859 | |
| 860 | if (from_idle && ((cpu_level->mode == MSM_PM_SLEEP_MODE_POWER_COLLAPSE) |
| 861 | || (cpu_level->mode == |
| 862 | MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE) |
| 863 | || cpu_level->is_reset)) |
| 864 | cpu_pm_exit(); |
| 865 | |
| 866 | /* |
| 867 | * Restore JTAG registers for 8996v1.0 & 8996v2.x in C4 LPM |
| 868 | */ |
| 869 | if (jtag_save_restore) |
| 870 | msm_jtag_restore_state(); |
| 871 | } |
| 872 | |
| 873 | #if defined(CONFIG_ARM_PSCI) || !defined(CONFIG_CPU_V7) |
| 874 | static int get_cluster_id(struct lpm_cluster *cluster, int *aff_lvl) |
| 875 | { |
| 876 | int state_id = 0; |
| 877 | |
| 878 | if (!cluster) |
| 879 | return 0; |
| 880 | |
| 881 | spin_lock(&cluster->sync_lock); |
| 882 | |
| 883 | if (!cpumask_equal(&cluster->num_children_in_sync, |
| 884 | &cluster->child_cpus)) |
| 885 | goto unlock_and_return; |
| 886 | |
| 887 | state_id |= get_cluster_id(cluster->parent, aff_lvl); |
| 888 | |
| 889 | if (cluster->last_level != cluster->default_level) { |
| 890 | struct lpm_cluster_level *level |
| 891 | = &cluster->levels[cluster->last_level]; |
| 892 | |
| 893 | state_id |= (level->psci_id & cluster->psci_mode_mask) |
| 894 | << cluster->psci_mode_shift; |
| 895 | (*aff_lvl)++; |
| 896 | } |
| 897 | unlock_and_return: |
| 898 | spin_unlock(&cluster->sync_lock); |
| 899 | return state_id; |
| 900 | } |
| 901 | #endif |
| 902 | |
| 903 | #if !defined(CONFIG_CPU_V7) |
| 904 | asmlinkage int __invoke_psci_fn_smc(u64, u64, u64, u64); |
| 905 | static bool psci_enter_sleep(struct lpm_cluster *cluster, |
| 906 | int idx, bool from_idle) |
| 907 | |
| 908 | { |
| 909 | bool ret; |
| 910 | /* |
| 911 | * idx = 0 is the default LPM state |
| 912 | */ |
| 913 | if (!idx) { |
| 914 | stop_critical_timings(); |
| 915 | wfi(); |
| 916 | start_critical_timings(); |
| 917 | ret = true; |
| 918 | } else { |
| 919 | int affinity_level = 0; |
| 920 | int state_id = get_cluster_id(cluster, &affinity_level); |
| 921 | int power_state = |
| 922 | PSCI_POWER_STATE(cluster->cpu->levels[idx].is_reset); |
| 923 | bool success = false; |
| 924 | |
| 925 | if (cluster->cpu->levels[idx].hyp_psci) { |
| 926 | stop_critical_timings(); |
| 927 | __invoke_psci_fn_smc(0xC4000021, 0, 0, 0); |
| 928 | start_critical_timings(); |
| 929 | return 1; |
| 930 | } |
| 931 | |
| 932 | affinity_level = PSCI_AFFINITY_LEVEL(affinity_level); |
| 933 | state_id |= (power_state | affinity_level |
| 934 | | cluster->cpu->levels[idx].psci_id); |
| 935 | |
| 936 | update_debug_pc_event(CPU_ENTER, state_id, |
| 937 | 0xdeaffeed, 0xdeaffeed, true); |
| 938 | stop_critical_timings(); |
| 939 | success = !arm_cpuidle_suspend(state_id); |
| 940 | start_critical_timings(); |
| 941 | update_debug_pc_event(CPU_EXIT, state_id, |
| 942 | success, 0xdeaffeed, true); |
| 943 | ret = success; |
| 944 | } |
| 945 | return ret; |
| 946 | } |
| 947 | #elif defined(CONFIG_ARM_PSCI) |
| 948 | static bool psci_enter_sleep(struct lpm_cluster *cluster, |
| 949 | int idx, bool from_idle) |
| 950 | { |
| 951 | bool ret; |
| 952 | |
| 953 | if (!idx) { |
| 954 | stop_critical_timings(); |
| 955 | wfi(); |
| 956 | start_critical_timings(); |
| 957 | ret = true; |
| 958 | } else { |
| 959 | int affinity_level = 0; |
| 960 | int state_id = get_cluster_id(cluster, &affinity_level); |
| 961 | int power_state = |
| 962 | PSCI_POWER_STATE(cluster->cpu->levels[idx].is_reset); |
| 963 | bool success = false; |
| 964 | |
| 965 | affinity_level = PSCI_AFFINITY_LEVEL(affinity_level); |
| 966 | state_id |= (power_state | affinity_level |
| 967 | | cluster->cpu->levels[idx].psci_id); |
| 968 | |
| 969 | update_debug_pc_event(CPU_ENTER, state_id, |
| 970 | 0xdeaffeed, 0xdeaffeed, true); |
| 971 | stop_critical_timings(); |
| 972 | success = !arm_cpuidle_suspend(state_id); |
| 973 | start_critical_timings(); |
| 974 | update_debug_pc_event(CPU_EXIT, state_id, |
| 975 | success, 0xdeaffeed, true); |
| 976 | ret = success; |
| 977 | } |
| 978 | return ret; |
| 979 | } |
| 980 | #else |
| 981 | static bool psci_enter_sleep(struct lpm_cluster *cluster, |
| 982 | int idx, bool from_idle) |
| 983 | { |
| 984 | WARN_ONCE(true, "PSCI cpu_suspend ops not supported\n"); |
| 985 | return false; |
| 986 | } |
| 987 | #endif |
| 988 | |
| 989 | static int lpm_cpuidle_select(struct cpuidle_driver *drv, |
| 990 | struct cpuidle_device *dev) |
| 991 | { |
| 992 | struct lpm_cluster *cluster = per_cpu(cpu_cluster, dev->cpu); |
| 993 | int idx; |
| 994 | |
| 995 | if (!cluster) |
| 996 | return 0; |
| 997 | |
| 998 | idx = cpu_power_select(dev, cluster->cpu); |
| 999 | |
| 1000 | return idx; |
| 1001 | } |
| 1002 | |
| 1003 | static int lpm_cpuidle_enter(struct cpuidle_device *dev, |
| 1004 | struct cpuidle_driver *drv, int idx) |
| 1005 | { |
| 1006 | struct lpm_cluster *cluster = per_cpu(cpu_cluster, dev->cpu); |
| 1007 | bool success = true; |
| 1008 | const struct cpumask *cpumask = get_cpu_mask(dev->cpu); |
| 1009 | ktime_t start = ktime_get(); |
| 1010 | int64_t start_time = ktime_to_ns(ktime_get()), end_time; |
| 1011 | |
| 1012 | if (idx < 0) |
| 1013 | return -EINVAL; |
| 1014 | |
| 1015 | cpu_prepare(cluster, idx, true); |
| 1016 | cluster_prepare(cluster, cpumask, idx, true, ktime_to_ns(ktime_get())); |
| 1017 | |
| 1018 | trace_cpu_idle_enter(idx); |
| 1019 | lpm_stats_cpu_enter(idx, start_time); |
| 1020 | |
| 1021 | if (need_resched()) |
| 1022 | goto exit; |
| 1023 | |
| 1024 | if (!use_psci) { |
| 1025 | if (idx > 0) |
| 1026 | update_debug_pc_event(CPU_ENTER, idx, 0xdeaffeed, |
| 1027 | 0xdeaffeed, true); |
| 1028 | success = msm_cpu_pm_enter_sleep(cluster->cpu->levels[idx].mode, |
| 1029 | true); |
| 1030 | |
| 1031 | if (idx > 0) |
| 1032 | update_debug_pc_event(CPU_EXIT, idx, success, |
| 1033 | 0xdeaffeed, true); |
| 1034 | } else { |
| 1035 | success = psci_enter_sleep(cluster, idx, true); |
| 1036 | } |
| 1037 | |
| 1038 | exit: |
| 1039 | end_time = ktime_to_ns(ktime_get()); |
| 1040 | lpm_stats_cpu_exit(idx, end_time, success); |
| 1041 | |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 1042 | cluster_unprepare(cluster, cpumask, idx, true, end_time, success); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 1043 | cpu_unprepare(cluster, idx, true); |
| 1044 | |
| 1045 | trace_cpu_idle_exit(idx, success); |
| 1046 | dev->last_residency = ktime_us_delta(ktime_get(), start); |
| 1047 | local_irq_enable(); |
| 1048 | |
| 1049 | return idx; |
| 1050 | } |
| 1051 | |
| 1052 | #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS |
| 1053 | static int cpuidle_register_cpu(struct cpuidle_driver *drv, |
| 1054 | struct cpumask *mask) |
| 1055 | { |
| 1056 | struct cpuidle_device *device; |
| 1057 | int cpu, ret; |
| 1058 | |
| 1059 | |
| 1060 | if (!mask || !drv) |
| 1061 | return -EINVAL; |
| 1062 | |
| 1063 | drv->cpumask = mask; |
| 1064 | ret = cpuidle_register_driver(drv); |
| 1065 | if (ret) { |
| 1066 | pr_err("Failed to register cpuidle driver %d\n", ret); |
| 1067 | goto failed_driver_register; |
| 1068 | } |
| 1069 | |
| 1070 | for_each_cpu(cpu, mask) { |
| 1071 | device = &per_cpu(cpuidle_dev, cpu); |
| 1072 | device->cpu = cpu; |
| 1073 | |
| 1074 | ret = cpuidle_register_device(device); |
| 1075 | if (ret) { |
| 1076 | pr_err("Failed to register cpuidle driver for cpu:%u\n", |
| 1077 | cpu); |
| 1078 | goto failed_driver_register; |
| 1079 | } |
| 1080 | } |
| 1081 | return ret; |
| 1082 | failed_driver_register: |
| 1083 | for_each_cpu(cpu, mask) |
| 1084 | cpuidle_unregister_driver(drv); |
| 1085 | return ret; |
| 1086 | } |
| 1087 | #else |
| 1088 | static int cpuidle_register_cpu(struct cpuidle_driver *drv, |
| 1089 | struct cpumask *mask) |
| 1090 | { |
| 1091 | return cpuidle_register(drv, NULL); |
| 1092 | } |
| 1093 | #endif |
| 1094 | |
| 1095 | static struct cpuidle_governor lpm_governor = { |
| 1096 | .name = "qcom", |
| 1097 | .rating = 30, |
| 1098 | .select = lpm_cpuidle_select, |
| 1099 | .owner = THIS_MODULE, |
| 1100 | }; |
| 1101 | |
| 1102 | static int cluster_cpuidle_register(struct lpm_cluster *cl) |
| 1103 | { |
| 1104 | int i = 0, ret = 0; |
| 1105 | unsigned int cpu; |
| 1106 | struct lpm_cluster *p = NULL; |
| 1107 | |
| 1108 | if (!cl->cpu) { |
| 1109 | struct lpm_cluster *n; |
| 1110 | |
| 1111 | list_for_each_entry(n, &cl->child, list) { |
| 1112 | ret = cluster_cpuidle_register(n); |
| 1113 | if (ret) |
| 1114 | break; |
| 1115 | } |
| 1116 | return ret; |
| 1117 | } |
| 1118 | |
| 1119 | cl->drv = kzalloc(sizeof(*cl->drv), GFP_KERNEL); |
| 1120 | if (!cl->drv) |
| 1121 | return -ENOMEM; |
| 1122 | |
| 1123 | cl->drv->name = "msm_idle"; |
| 1124 | |
| 1125 | for (i = 0; i < cl->cpu->nlevels; i++) { |
| 1126 | struct cpuidle_state *st = &cl->drv->states[i]; |
| 1127 | struct lpm_cpu_level *cpu_level = &cl->cpu->levels[i]; |
| 1128 | |
| 1129 | snprintf(st->name, CPUIDLE_NAME_LEN, "C%u\n", i); |
| 1130 | snprintf(st->desc, CPUIDLE_DESC_LEN, "%s", cpu_level->name); |
| 1131 | st->flags = 0; |
| 1132 | st->exit_latency = cpu_level->pwr.latency_us; |
| 1133 | st->power_usage = cpu_level->pwr.ss_power; |
| 1134 | st->target_residency = 0; |
| 1135 | st->enter = lpm_cpuidle_enter; |
| 1136 | } |
| 1137 | |
| 1138 | cl->drv->state_count = cl->cpu->nlevels; |
| 1139 | cl->drv->safe_state_index = 0; |
| 1140 | for_each_cpu(cpu, &cl->child_cpus) |
| 1141 | per_cpu(cpu_cluster, cpu) = cl; |
| 1142 | |
| 1143 | for_each_possible_cpu(cpu) { |
| 1144 | if (cpu_online(cpu)) |
| 1145 | continue; |
| 1146 | p = per_cpu(cpu_cluster, cpu); |
| 1147 | while (p) { |
| 1148 | int j; |
| 1149 | |
| 1150 | spin_lock(&p->sync_lock); |
| 1151 | cpumask_set_cpu(cpu, &p->num_children_in_sync); |
| 1152 | for (j = 0; j < p->nlevels; j++) |
| 1153 | cpumask_copy(&p->levels[j].num_cpu_votes, |
| 1154 | &p->num_children_in_sync); |
| 1155 | spin_unlock(&p->sync_lock); |
| 1156 | p = p->parent; |
| 1157 | } |
| 1158 | } |
| 1159 | ret = cpuidle_register_cpu(cl->drv, &cl->child_cpus); |
| 1160 | |
| 1161 | if (ret) { |
| 1162 | kfree(cl->drv); |
| 1163 | return -ENOMEM; |
| 1164 | } |
| 1165 | return 0; |
| 1166 | } |
| 1167 | |
| 1168 | /** |
| 1169 | * init_lpm - initializes the governor |
| 1170 | */ |
| 1171 | static int __init init_lpm(void) |
| 1172 | { |
| 1173 | return cpuidle_register_governor(&lpm_governor); |
| 1174 | } |
| 1175 | |
| 1176 | postcore_initcall(init_lpm); |
| 1177 | |
| 1178 | static void register_cpu_lpm_stats(struct lpm_cpu *cpu, |
| 1179 | struct lpm_cluster *parent) |
| 1180 | { |
| 1181 | const char **level_name; |
| 1182 | int i; |
| 1183 | |
| 1184 | level_name = kcalloc(cpu->nlevels, sizeof(*level_name), GFP_KERNEL); |
| 1185 | |
| 1186 | if (!level_name) |
| 1187 | return; |
| 1188 | |
| 1189 | for (i = 0; i < cpu->nlevels; i++) |
| 1190 | level_name[i] = cpu->levels[i].name; |
| 1191 | |
| 1192 | lpm_stats_config_level("cpu", level_name, cpu->nlevels, |
| 1193 | parent->stats, &parent->child_cpus); |
| 1194 | |
| 1195 | kfree(level_name); |
| 1196 | } |
| 1197 | |
| 1198 | static void register_cluster_lpm_stats(struct lpm_cluster *cl, |
| 1199 | struct lpm_cluster *parent) |
| 1200 | { |
| 1201 | const char **level_name; |
| 1202 | int i; |
| 1203 | struct lpm_cluster *child; |
| 1204 | |
| 1205 | if (!cl) |
| 1206 | return; |
| 1207 | |
| 1208 | level_name = kcalloc(cl->nlevels, sizeof(*level_name), GFP_KERNEL); |
| 1209 | |
| 1210 | if (!level_name) |
| 1211 | return; |
| 1212 | |
| 1213 | for (i = 0; i < cl->nlevels; i++) |
| 1214 | level_name[i] = cl->levels[i].level_name; |
| 1215 | |
| 1216 | cl->stats = lpm_stats_config_level(cl->cluster_name, level_name, |
| 1217 | cl->nlevels, parent ? parent->stats : NULL, NULL); |
| 1218 | |
| 1219 | kfree(level_name); |
| 1220 | |
| 1221 | if (cl->cpu) { |
| 1222 | register_cpu_lpm_stats(cl->cpu, cl); |
| 1223 | return; |
| 1224 | } |
| 1225 | |
| 1226 | list_for_each_entry(child, &cl->child, list) |
| 1227 | register_cluster_lpm_stats(child, cl); |
| 1228 | } |
| 1229 | |
| 1230 | static int lpm_suspend_prepare(void) |
| 1231 | { |
| 1232 | suspend_in_progress = true; |
| 1233 | lpm_stats_suspend_enter(); |
| 1234 | |
| 1235 | return 0; |
| 1236 | } |
| 1237 | |
| 1238 | static void lpm_suspend_wake(void) |
| 1239 | { |
| 1240 | suspend_in_progress = false; |
| 1241 | lpm_stats_suspend_exit(); |
| 1242 | } |
| 1243 | |
| 1244 | static int lpm_suspend_enter(suspend_state_t state) |
| 1245 | { |
| 1246 | int cpu = raw_smp_processor_id(); |
| 1247 | struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu); |
| 1248 | struct lpm_cpu *lpm_cpu = cluster->cpu; |
| 1249 | const struct cpumask *cpumask = get_cpu_mask(cpu); |
| 1250 | int idx; |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 1251 | bool success = true; |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 1252 | |
| 1253 | for (idx = lpm_cpu->nlevels - 1; idx >= 0; idx--) { |
| 1254 | |
| 1255 | if (lpm_cpu_mode_allow(cpu, idx, false)) |
| 1256 | break; |
| 1257 | } |
| 1258 | if (idx < 0) { |
| 1259 | pr_err("Failed suspend\n"); |
| 1260 | return 0; |
| 1261 | } |
| 1262 | cpu_prepare(cluster, idx, false); |
| 1263 | cluster_prepare(cluster, cpumask, idx, false, 0); |
| 1264 | if (idx > 0) |
| 1265 | update_debug_pc_event(CPU_ENTER, idx, 0xdeaffeed, |
| 1266 | 0xdeaffeed, false); |
| 1267 | |
| 1268 | /* |
| 1269 | * Print the clocks which are enabled during system suspend |
| 1270 | * This debug information is useful to know which are the |
| 1271 | * clocks that are enabled and preventing the system level |
| 1272 | * LPMs(XO and Vmin). |
| 1273 | */ |
| 1274 | clock_debug_print_enabled(true); |
| 1275 | |
| 1276 | if (!use_psci) |
| 1277 | msm_cpu_pm_enter_sleep(cluster->cpu->levels[idx].mode, false); |
| 1278 | else |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 1279 | success = psci_enter_sleep(cluster, idx, true); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 1280 | |
| 1281 | if (idx > 0) |
| 1282 | update_debug_pc_event(CPU_EXIT, idx, true, 0xdeaffeed, |
| 1283 | false); |
| 1284 | |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 1285 | cluster_unprepare(cluster, cpumask, idx, false, 0, success); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 1286 | cpu_unprepare(cluster, idx, false); |
| 1287 | return 0; |
| 1288 | } |
| 1289 | |
| 1290 | static int lpm_dying_cpu(unsigned int cpu) |
| 1291 | { |
| 1292 | struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu); |
| 1293 | |
| 1294 | update_debug_pc_event(CPU_HP_DYING, cpu, |
| 1295 | cluster->num_children_in_sync.bits[0], |
| 1296 | cluster->child_cpus.bits[0], false); |
| 1297 | cluster_prepare(cluster, get_cpu_mask(cpu), NR_LPM_LEVELS, false, 0); |
| 1298 | return 0; |
| 1299 | } |
| 1300 | |
| 1301 | static int lpm_starting_cpu(unsigned int cpu) |
| 1302 | { |
| 1303 | struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu); |
| 1304 | |
| 1305 | update_debug_pc_event(CPU_HP_STARTING, cpu, |
| 1306 | cluster->num_children_in_sync.bits[0], |
| 1307 | cluster->child_cpus.bits[0], false); |
Maulik Shah | 083e22a | 2018-11-29 14:30:07 +0530 | [diff] [blame] | 1308 | cluster_unprepare(cluster, get_cpu_mask(cpu), NR_LPM_LEVELS, |
| 1309 | false, 0, true); |
Raja Mallik | b9ad452 | 2018-04-19 15:23:49 +0530 | [diff] [blame] | 1310 | return 0; |
| 1311 | } |
| 1312 | |
| 1313 | static const struct platform_suspend_ops lpm_suspend_ops = { |
| 1314 | .enter = lpm_suspend_enter, |
| 1315 | .valid = suspend_valid_only_mem, |
| 1316 | .prepare_late = lpm_suspend_prepare, |
| 1317 | .wake = lpm_suspend_wake, |
| 1318 | }; |
| 1319 | |
| 1320 | static int lpm_probe(struct platform_device *pdev) |
| 1321 | { |
| 1322 | int ret; |
| 1323 | int size; |
| 1324 | struct kobject *module_kobj = NULL; |
| 1325 | struct md_region md_entry; |
| 1326 | |
| 1327 | get_online_cpus(); |
| 1328 | lpm_root_node = lpm_of_parse_cluster(pdev); |
| 1329 | |
| 1330 | if (IS_ERR_OR_NULL(lpm_root_node)) { |
| 1331 | pr_err("%s(): Failed to probe low power modes\n", __func__); |
| 1332 | put_online_cpus(); |
| 1333 | return PTR_ERR(lpm_root_node); |
| 1334 | } |
| 1335 | |
| 1336 | if (print_parsed_dt) |
| 1337 | cluster_dt_walkthrough(lpm_root_node); |
| 1338 | |
| 1339 | /* |
| 1340 | * Register hotplug notifier before broadcast time to ensure there |
| 1341 | * to prevent race where a broadcast timer might not be setup on for a |
| 1342 | * core. BUG in existing code but no known issues possibly because of |
| 1343 | * how late lpm_levels gets initialized. |
| 1344 | */ |
| 1345 | suspend_set_ops(&lpm_suspend_ops); |
| 1346 | hrtimer_init(&lpm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1347 | |
| 1348 | ret = remote_spin_lock_init(&scm_handoff_lock, SCM_HANDOFF_LOCK_ID); |
| 1349 | if (ret) { |
| 1350 | pr_err("%s: Failed initializing scm_handoff_lock (%d)\n", |
| 1351 | __func__, ret); |
| 1352 | put_online_cpus(); |
| 1353 | return ret; |
| 1354 | } |
| 1355 | size = num_dbg_elements * sizeof(struct lpm_debug); |
| 1356 | lpm_debug = dma_alloc_coherent(&pdev->dev, size, |
| 1357 | &lpm_debug_phys, GFP_KERNEL); |
| 1358 | register_cluster_lpm_stats(lpm_root_node, NULL); |
| 1359 | |
| 1360 | ret = cluster_cpuidle_register(lpm_root_node); |
| 1361 | put_online_cpus(); |
| 1362 | if (ret) { |
| 1363 | pr_err("%s()Failed to register with cpuidle framework\n", |
| 1364 | __func__); |
| 1365 | goto failed; |
| 1366 | } |
| 1367 | ret = cpuhp_setup_state(CPUHP_AP_QCOM_SLEEP_STARTING, |
| 1368 | "AP_QCOM_SLEEP_STARTING", |
| 1369 | lpm_starting_cpu, lpm_dying_cpu); |
| 1370 | if (ret) |
| 1371 | goto failed; |
| 1372 | |
| 1373 | module_kobj = kset_find_obj(module_kset, KBUILD_MODNAME); |
| 1374 | if (!module_kobj) { |
| 1375 | pr_err("%s: cannot find kobject for module %s\n", |
| 1376 | __func__, KBUILD_MODNAME); |
| 1377 | ret = -ENOENT; |
| 1378 | goto failed; |
| 1379 | } |
| 1380 | |
| 1381 | ret = create_cluster_lvl_nodes(lpm_root_node, module_kobj); |
| 1382 | if (ret) { |
| 1383 | pr_err("%s(): Failed to create cluster level nodes\n", |
| 1384 | __func__); |
| 1385 | goto failed; |
| 1386 | } |
| 1387 | |
| 1388 | /* Add lpm_debug to Minidump*/ |
| 1389 | strlcpy(md_entry.name, "KLPMDEBUG", sizeof(md_entry.name)); |
| 1390 | md_entry.virt_addr = (uintptr_t)lpm_debug; |
| 1391 | md_entry.phys_addr = lpm_debug_phys; |
| 1392 | md_entry.size = size; |
| 1393 | if (msm_minidump_add_region(&md_entry)) |
| 1394 | pr_info("Failed to add lpm_debug in Minidump\n"); |
| 1395 | |
| 1396 | return 0; |
| 1397 | failed: |
| 1398 | free_cluster_node(lpm_root_node); |
| 1399 | lpm_root_node = NULL; |
| 1400 | return ret; |
| 1401 | } |
| 1402 | |
| 1403 | static const struct of_device_id lpm_mtch_tbl[] = { |
| 1404 | {.compatible = "qcom,lpm-levels"}, |
| 1405 | {}, |
| 1406 | }; |
| 1407 | |
| 1408 | static struct platform_driver lpm_driver = { |
| 1409 | .probe = lpm_probe, |
| 1410 | .driver = { |
| 1411 | .name = "lpm-levels", |
| 1412 | .owner = THIS_MODULE, |
| 1413 | .of_match_table = lpm_mtch_tbl, |
| 1414 | }, |
| 1415 | }; |
| 1416 | |
| 1417 | static int __init lpm_levels_module_init(void) |
| 1418 | { |
| 1419 | int rc; |
| 1420 | |
| 1421 | rc = platform_driver_register(&lpm_driver); |
| 1422 | if (rc) { |
| 1423 | pr_info("Error registering %s\n", lpm_driver.driver.name); |
| 1424 | goto fail; |
| 1425 | } |
| 1426 | |
| 1427 | fail: |
| 1428 | return rc; |
| 1429 | } |
| 1430 | late_initcall(lpm_levels_module_init); |
| 1431 | |
| 1432 | enum msm_pm_l2_scm_flag lpm_cpu_pre_pc_cb(unsigned int cpu) |
| 1433 | { |
| 1434 | struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu); |
| 1435 | enum msm_pm_l2_scm_flag retflag = MSM_SCM_L2_ON; |
| 1436 | |
| 1437 | /* |
| 1438 | * No need to acquire the lock if probe isn't completed yet |
| 1439 | * In the event of the hotplug happening before lpm probe, we want to |
| 1440 | * flush the cache to make sure that L2 is flushed. In particular, this |
| 1441 | * could cause incoherencies for a cluster architecture. This wouldn't |
| 1442 | * affect the idle case as the idle driver wouldn't be registered |
| 1443 | * before the probe function |
| 1444 | */ |
| 1445 | if (!cluster) |
| 1446 | return MSM_SCM_L2_OFF; |
| 1447 | |
| 1448 | /* |
| 1449 | * Assumes L2 only. What/How parameters gets passed into TZ will |
| 1450 | * determine how this function reports this info back in msm-pm.c |
| 1451 | */ |
| 1452 | spin_lock(&cluster->sync_lock); |
| 1453 | |
| 1454 | if (!cluster->lpm_dev) { |
| 1455 | retflag = MSM_SCM_L2_OFF; |
| 1456 | goto unlock_and_return; |
| 1457 | } |
| 1458 | |
| 1459 | if (!cpumask_equal(&cluster->num_children_in_sync, |
| 1460 | &cluster->child_cpus)) |
| 1461 | goto unlock_and_return; |
| 1462 | |
| 1463 | if (cluster->lpm_dev) |
| 1464 | retflag = cluster->lpm_dev->tz_flag; |
| 1465 | /* |
| 1466 | * The scm_handoff_lock will be release by the secure monitor. |
| 1467 | * It is used to serialize power-collapses from this point on, |
| 1468 | * so that both Linux and the secure context have a consistent |
| 1469 | * view regarding the number of running cpus (cpu_count). |
| 1470 | * |
| 1471 | * It must be acquired before releasing the cluster lock. |
| 1472 | */ |
| 1473 | unlock_and_return: |
| 1474 | update_debug_pc_event(PRE_PC_CB, retflag, 0xdeadbeef, 0xdeadbeef, |
| 1475 | 0xdeadbeef); |
| 1476 | trace_pre_pc_cb(retflag); |
| 1477 | remote_spin_lock_rlock_id(&scm_handoff_lock, |
| 1478 | REMOTE_SPINLOCK_TID_START + cpu); |
| 1479 | spin_unlock(&cluster->sync_lock); |
| 1480 | return retflag; |
| 1481 | } |
| 1482 | |
| 1483 | /** |
| 1484 | * lpm_cpu_hotplug_enter(): Called by dying CPU to terminate in low power mode |
| 1485 | * |
| 1486 | * @cpu: cpuid of the dying CPU |
| 1487 | * |
| 1488 | * Called from platform_cpu_kill() to terminate hotplug in a low power mode |
| 1489 | */ |
| 1490 | void lpm_cpu_hotplug_enter(unsigned int cpu) |
| 1491 | { |
| 1492 | enum msm_pm_sleep_mode mode = MSM_PM_SLEEP_MODE_NR; |
| 1493 | struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu); |
| 1494 | int i; |
| 1495 | int idx = -1; |
| 1496 | |
| 1497 | /* |
| 1498 | * If lpm isn't probed yet, try to put cpu into the one of the modes |
| 1499 | * available |
| 1500 | */ |
| 1501 | if (!cluster) { |
| 1502 | if (msm_spm_is_mode_avail( |
| 1503 | MSM_SPM_MODE_POWER_COLLAPSE)){ |
| 1504 | mode = MSM_PM_SLEEP_MODE_POWER_COLLAPSE; |
| 1505 | } else if (msm_spm_is_mode_avail( |
| 1506 | MSM_SPM_MODE_FASTPC)) { |
| 1507 | mode = MSM_PM_SLEEP_MODE_FASTPC; |
| 1508 | } else if (msm_spm_is_mode_avail( |
| 1509 | MSM_SPM_MODE_RETENTION)) { |
| 1510 | mode = MSM_PM_SLEEP_MODE_RETENTION; |
| 1511 | } else { |
| 1512 | pr_err("No mode avail for cpu%d hotplug\n", cpu); |
| 1513 | WARN_ON(1); |
| 1514 | return; |
| 1515 | } |
| 1516 | } else { |
| 1517 | struct lpm_cpu *lpm_cpu; |
| 1518 | uint32_t ss_pwr = ~0U; |
| 1519 | |
| 1520 | lpm_cpu = cluster->cpu; |
| 1521 | for (i = 0; i < lpm_cpu->nlevels; i++) { |
| 1522 | if (ss_pwr < lpm_cpu->levels[i].pwr.ss_power) |
| 1523 | continue; |
| 1524 | ss_pwr = lpm_cpu->levels[i].pwr.ss_power; |
| 1525 | idx = i; |
| 1526 | mode = lpm_cpu->levels[i].mode; |
| 1527 | } |
| 1528 | |
| 1529 | if (mode == MSM_PM_SLEEP_MODE_NR) |
| 1530 | return; |
| 1531 | |
| 1532 | WARN_ON(idx < 0); |
| 1533 | cluster_prepare(cluster, get_cpu_mask(cpu), idx, false, 0); |
| 1534 | } |
| 1535 | |
| 1536 | msm_cpu_pm_enter_sleep(mode, false); |
| 1537 | } |