1 /* 2 * Copyright (c) 2015-2021 The Linux Foundation. All rights reserved. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for 5 * any purpose with or without fee is hereby granted, provided that the 6 * above copyright notice and this permission notice appear in all 7 * copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL 10 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE 12 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 15 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 16 * PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /** 20 * DOC: hif_irq_afinity.c 21 * 22 * This irq afinity implementation is os dependent, so this can be treated as 23 * an abstraction layer... Should this be moved into a /linux folder? 24 */ 25 26 #include <linux/string.h> /* memset */ 27 28 /* Linux headers */ 29 #include <linux/cpumask.h> 30 #include <linux/cpufreq.h> 31 #include <linux/cpu.h> 32 #include <linux/topology.h> 33 #include <linux/interrupt.h> 34 #include <linux/pm.h> 35 #include <hif_napi.h> 36 #include <hif_irq_affinity.h> 37 #include <hif_exec.h> 38 #include <hif_main.h> 39 #include "qdf_irq.h" 40 41 #if defined(FEATURE_NAPI_DEBUG) && defined(HIF_IRQ_AFFINITY) 42 /* 43 * Local functions 44 * - no argument checks, all internal/trusted callers 45 */ 46 static void hnc_dump_cpus(struct qca_napi_data *napid) 47 { 48 hif_napi_stats(napid); 49 } 50 #else 51 static void hnc_dump_cpus(struct qca_napi_data *napid) { /* no-op */ }; 52 #endif /* FEATURE_NAPI_DEBUG */ 53 54 #ifdef HIF_IRQ_AFFINITY 55 /** 56 * 57 * hif_exec_event() - reacts to events that impact irq affinity 58 * @hif : pointer to hif context 59 * @evnt: event that has been detected 60 * @data: more data regarding the event 61 * 62 * Description: 63 * This function handles two types of events: 64 * 1- Events that change the state of NAPI (enabled/disabled): 65 * {NAPI_EVT_INI_FILE, NAPI_EVT_CMD_STATE} 66 * The state is retrievable by "hdd_napi_enabled(-1)" 67 * - NAPI will be on if either INI file is on and it has not been disabled 68 * by a subsequent vendor CMD, 69 * or it has been enabled by a vendor CMD. 70 * 2- Events that change the CPU affinity of a NAPI instance/IRQ: 71 * {NAPI_EVT_TPUT_STATE, NAPI_EVT_CPU_STATE} 72 * - NAPI will support a throughput mode (HI/LO), kept at napid->napi_mode 73 * - NAPI will switch throughput mode based on hdd_napi_throughput_policy() 74 * - In LO tput mode, NAPI will yield control if its interrupts to the system 75 * management functions. However in HI throughput mode, NAPI will actively 76 * manage its interrupts/instances (by trying to disperse them out to 77 * separate performance cores). 78 * - CPU eligibility is kept up-to-date by NAPI_EVT_CPU_STATE events. 79 * 80 * + In some cases (roaming peer management is the only case so far), a 81 * a client can trigger a "SERIALIZE" event. Basically, this means that the 82 * users is asking NAPI to go into a truly single execution context state. 83 * So, NAPI indicates to msm-irqbalancer that it wants to be blacklisted, 84 * (if called for the first time) and then moves all IRQs (for NAPI 85 * instances) to be collapsed to a single core. If called multiple times, 86 * it will just re-collapse the CPUs. This is because blacklist-on() API 87 * is reference-counted, and because the API has already been called. 88 * 89 * Such a user, should call "DESERIALIZE" (NORMAL) event, to set NAPI to go 90 * to its "normal" operation. Optionally, they can give a timeout value (in 91 * multiples of BusBandwidthCheckPeriod -- 100 msecs by default). In this 92 * case, NAPI will just set the current throughput state to uninitialized 93 * and set the delay period. Once policy handler is called, it would skip 94 * applying the policy delay period times, and otherwise apply the policy. 95 * 96 * Return: 97 * < 0: some error 98 * = 0: event handled successfully 99 */ 100 int hif_exec_event(struct hif_opaque_softc *hif_ctx, enum qca_napi_event event, 101 void *data) 102 { 103 int rc = 0; 104 uint32_t prev_state; 105 struct hif_softc *hif = HIF_GET_SOFTC(hif_ctx); 106 struct qca_napi_data *napid = &(hif->napi_data); 107 enum qca_napi_tput_state tput_mode = QCA_NAPI_TPUT_UNINITIALIZED; 108 enum { 109 BLACKLIST_NOT_PENDING, 110 BLACKLIST_ON_PENDING, 111 BLACKLIST_OFF_PENDING 112 } blacklist_pending = BLACKLIST_NOT_PENDING; 113 114 NAPI_DEBUG("%s: -->(event=%d, aux=%pK)", __func__, event, data); 115 116 qdf_spin_lock_bh(&(napid->lock)); 117 prev_state = napid->state; 118 switch (event) { 119 case NAPI_EVT_INI_FILE: 120 case NAPI_EVT_CMD_STATE: 121 case NAPI_EVT_INT_STATE: 122 /* deprecated */ 123 break; 124 125 case NAPI_EVT_CPU_STATE: { 126 int cpu = ((unsigned long int)data >> 16); 127 int val = ((unsigned long int)data & 0x0ff); 128 129 NAPI_DEBUG("%s: evt=CPU_STATE on CPU %d value=%d", 130 __func__, cpu, val); 131 132 /* state has already been set by hnc_cpu_notify_cb */ 133 if ((val == QCA_NAPI_CPU_DOWN) && 134 (napid->napi_mode == QCA_NAPI_TPUT_HI) && /* we manage */ 135 (napid->napi_cpu[cpu].napis != 0)) { 136 NAPI_DEBUG("%s: Migrating NAPIs out of cpu %d", 137 __func__, cpu); 138 rc = hif_exec_cpu_migrate(napid, 139 cpu, 140 HNC_ACT_RELOCATE); 141 napid->napi_cpu[cpu].napis = 0; 142 } 143 /* in QCA_NAPI_TPUT_LO case, napis MUST == 0 */ 144 break; 145 } 146 147 case NAPI_EVT_TPUT_STATE: { 148 tput_mode = (enum qca_napi_tput_state)data; 149 if (tput_mode == QCA_NAPI_TPUT_LO) { 150 /* from TPUT_HI -> TPUT_LO */ 151 NAPI_DEBUG("%s: Moving to napi_tput_LO state", 152 __func__); 153 blacklist_pending = BLACKLIST_OFF_PENDING; 154 /* 155 * Ideally we should "collapse" interrupts here, since 156 * we are "dispersing" interrupts in the "else" case. 157 * This allows the possibility that our interrupts may 158 * still be on the perf cluster the next time we enter 159 * high tput mode. However, the irq_balancer is free 160 * to move our interrupts to power cluster once 161 * blacklisting has been turned off in the "else" case. 162 */ 163 } else { 164 /* from TPUT_LO -> TPUT->HI */ 165 NAPI_DEBUG("%s: Moving to napi_tput_HI state", 166 __func__); 167 rc = hif_exec_cpu_migrate(napid, 168 HNC_ANY_CPU, 169 HNC_ACT_DISPERSE); 170 171 blacklist_pending = BLACKLIST_ON_PENDING; 172 } 173 napid->napi_mode = tput_mode; 174 break; 175 } 176 177 case NAPI_EVT_USR_SERIAL: { 178 unsigned long users = (unsigned long)data; 179 180 NAPI_DEBUG("%s: User forced SERIALIZATION; users=%ld", 181 __func__, users); 182 183 rc = hif_exec_cpu_migrate(napid, 184 HNC_ANY_CPU, 185 HNC_ACT_COLLAPSE); 186 if ((users == 0) && (rc == 0)) 187 blacklist_pending = BLACKLIST_ON_PENDING; 188 break; 189 } 190 case NAPI_EVT_USR_NORMAL: { 191 NAPI_DEBUG("%s: User forced DE-SERIALIZATION", __func__); 192 if (!napid->user_cpu_affin_mask) 193 blacklist_pending = BLACKLIST_OFF_PENDING; 194 /* 195 * Deserialization timeout is handled at hdd layer; 196 * just mark current mode to uninitialized to ensure 197 * it will be set when the delay is over 198 */ 199 napid->napi_mode = QCA_NAPI_TPUT_UNINITIALIZED; 200 break; 201 } 202 default: { 203 hif_err("Unknown event: %d (data=0x%0lx)", 204 event, (unsigned long) data); 205 break; 206 } /* default */ 207 }; /* switch */ 208 209 210 switch (blacklist_pending) { 211 case BLACKLIST_ON_PENDING: 212 /* assume the control of WLAN IRQs */ 213 hif_napi_cpu_blacklist(napid, BLACKLIST_ON); 214 break; 215 case BLACKLIST_OFF_PENDING: 216 /* yield the control of WLAN IRQs */ 217 hif_napi_cpu_blacklist(napid, BLACKLIST_OFF); 218 break; 219 default: /* nothing to do */ 220 break; 221 } /* switch blacklist_pending */ 222 223 qdf_spin_unlock_bh(&(napid->lock)); 224 225 NAPI_DEBUG("<--[rc=%d]", rc); 226 return rc; 227 } 228 229 #endif 230 231 /** 232 * hncm_migrate_to() - migrates a NAPI to a CPU 233 * @napid: pointer to NAPI block 234 * @ce_id: CE_id of the NAPI instance 235 * @didx : index in the CPU topology table for the CPU to migrate to 236 * 237 * Migrates NAPI (identified by the CE_id) to the destination core 238 * Updates the napi_map of the destination entry 239 * 240 * Return: 241 * =0 : success 242 * <0 : error 243 */ 244 static int hncm_exec_migrate_to(struct qca_napi_data *napid, uint8_t ctx_id, 245 int didx) 246 { 247 struct hif_exec_context *exec_ctx; 248 struct qdf_cpu_mask *cpumask; 249 int rc = 0; 250 int status = 0; 251 int ind; 252 253 NAPI_DEBUG("-->%s(napi_cd=%d, didx=%d)", __func__, ctx_id, didx); 254 255 exec_ctx = hif_exec_get_ctx(&napid->hif_softc->osc, ctx_id); 256 if (!exec_ctx) 257 return -EINVAL; 258 259 exec_ctx->cpumask.bits[0] = (1 << didx); 260 261 for (ind = 0; ind < exec_ctx->numirq; ind++) { 262 if (exec_ctx->os_irq[ind]) { 263 qdf_dev_modify_irq_status(exec_ctx->os_irq[ind], 264 QDF_IRQ_NO_BALANCING, 0); 265 cpumask = (struct qdf_cpu_mask *)&exec_ctx->cpumask; 266 rc = qdf_dev_set_irq_affinity(exec_ctx->os_irq[ind], 267 cpumask); 268 if (rc) 269 status = rc; 270 } 271 } 272 273 /* unmark the napis bitmap in the cpu table */ 274 napid->napi_cpu[exec_ctx->cpu].napis &= ~(0x01 << ctx_id); 275 /* mark the napis bitmap for the new designated cpu */ 276 napid->napi_cpu[didx].napis |= (0x01 << ctx_id); 277 exec_ctx->cpu = didx; 278 279 NAPI_DEBUG("<--%s[%d]", __func__, rc); 280 return status; 281 } 282 283 /** 284 * hncm_dest_cpu() - finds a destination CPU for NAPI 285 * @napid: pointer to NAPI block 286 * @act : RELOCATE | COLLAPSE | DISPERSE 287 * 288 * Finds the designated destionation for the next IRQ. 289 * RELOCATE: translated to either COLLAPSE or DISPERSE based 290 * on napid->napi_mode (throughput state) 291 * COLLAPSE: All have the same destination: the first online CPU in lilcl 292 * DISPERSE: One of the CPU in bigcl, which has the smallest number of 293 * NAPIs on it 294 * 295 * Return: >=0 : index in the cpu topology table 296 * : < 0 : error 297 */ 298 static int hncm_dest_cpu(struct qca_napi_data *napid, int act) 299 { 300 int destidx = -1; 301 int head, i; 302 303 NAPI_DEBUG("-->%s(act=%d)", __func__, act); 304 if (act == HNC_ACT_RELOCATE) { 305 if (napid->napi_mode == QCA_NAPI_TPUT_LO) 306 act = HNC_ACT_COLLAPSE; 307 else 308 act = HNC_ACT_DISPERSE; 309 NAPI_DEBUG("%s: act changed from HNC_ACT_RELOCATE to %d", 310 __func__, act); 311 } 312 if (act == HNC_ACT_COLLAPSE) { 313 head = i = napid->lilcl_head; 314 retry_collapse: 315 while (i >= 0) { 316 if (napid->napi_cpu[i].state == QCA_NAPI_CPU_UP) { 317 destidx = i; 318 break; 319 } 320 i = napid->napi_cpu[i].cluster_nxt; 321 } 322 if ((destidx < 0) && (head == napid->lilcl_head)) { 323 NAPI_DEBUG("%s: COLLAPSE: no lilcl dest, try bigcl", 324 __func__); 325 head = i = napid->bigcl_head; 326 goto retry_collapse; 327 } 328 } else { /* HNC_ACT_DISPERSE */ 329 int smallest = 99; /* all 32 bits full */ 330 int smallidx = -1; 331 332 head = i = napid->bigcl_head; 333 retry_disperse: 334 while (i >= 0) { 335 if ((napid->napi_cpu[i].state == QCA_NAPI_CPU_UP) && 336 (hweight32(napid->napi_cpu[i].napis) <= smallest)) { 337 smallest = napid->napi_cpu[i].napis; 338 smallidx = i; 339 } 340 i = napid->napi_cpu[i].cluster_nxt; 341 } 342 destidx = smallidx; 343 if ((destidx < 0) && (head == napid->bigcl_head)) { 344 NAPI_DEBUG("%s: DISPERSE: no bigcl dest, try lilcl", 345 __func__); 346 head = i = napid->lilcl_head; 347 goto retry_disperse; 348 } 349 } 350 NAPI_DEBUG("<--%s[dest=%d]", __func__, destidx); 351 return destidx; 352 } 353 /** 354 * hif_napi_cpu_migrate() - migrate IRQs away 355 * @cpu: -1: all CPUs <n> specific CPU 356 * @act: COLLAPSE | DISPERSE 357 * 358 * Moves IRQs/NAPIs from specific or all CPUs (specified by @cpu) to eligible 359 * cores. Eligible cores are: 360 * act=COLLAPSE -> the first online core of the little cluster 361 * act=DISPERSE -> separate cores of the big cluster, so that each core will 362 * host minimum number of NAPIs/IRQs (napid->cpus[cpu].napis) 363 * 364 * Note that this function is called with a spinlock acquired already. 365 * 366 * Return: =0: success 367 * <0: error 368 */ 369 int hif_exec_cpu_migrate(struct qca_napi_data *napid, int cpu, int action) 370 { 371 int rc = 0; 372 struct qca_napi_cpu *cpup; 373 int i, dind; 374 uint32_t napis; 375 376 377 NAPI_DEBUG("-->%s(.., cpu=%d, act=%d)", 378 __func__, cpu, action); 379 380 if (napid->exec_map == 0) { 381 NAPI_DEBUG("%s: datapath contexts to disperse", __func__); 382 goto hncm_return; 383 } 384 cpup = napid->napi_cpu; 385 386 switch (action) { 387 case HNC_ACT_RELOCATE: 388 case HNC_ACT_DISPERSE: 389 case HNC_ACT_COLLAPSE: { 390 /* first find the src napi set */ 391 if (cpu == HNC_ANY_CPU) 392 napis = napid->exec_map; 393 else 394 napis = cpup[cpu].napis; 395 /* then clear the napi bitmap on each CPU */ 396 for (i = 0; i < NR_CPUS; i++) 397 cpup[i].napis = 0; 398 /* then for each of the NAPIs to disperse: */ 399 for (i = 0; i < HIF_MAX_GROUP; i++) 400 if (napis & (1 << i)) { 401 /* find a destination CPU */ 402 dind = hncm_dest_cpu(napid, action); 403 if (dind >= 0) { 404 rc = hncm_exec_migrate_to(napid, i, 405 dind); 406 } else { 407 NAPI_DEBUG("No dest for NAPI ce%d", i); 408 hnc_dump_cpus(napid); 409 rc = -1; 410 } 411 } 412 break; 413 } 414 default: { 415 NAPI_DEBUG("%s: bad action: %d\n", __func__, action); 416 QDF_BUG(0); 417 break; 418 } 419 } /* switch action */ 420 421 hncm_return: 422 hnc_dump_cpus(napid); 423 return rc; 424 } 425 426 427 /** 428 * hif_exec_bl_irq() - calls irq_modify_status to enable/disable blacklisting 429 * @napid: pointer to qca_napi_data structure 430 * @bl_flag: blacklist flag to enable/disable blacklisting 431 * 432 * The function enables/disables blacklisting for all the copy engine 433 * interrupts on which NAPI is enabled. 434 * 435 * Return: None 436 */ 437 static inline void hif_exec_bl_irq(struct qca_napi_data *napid, bool bl_flag) 438 { 439 int i, j; 440 struct hif_exec_context *exec_ctx; 441 442 for (i = 0; i < HIF_MAX_GROUP; i++) { 443 /* check if NAPI is enabled on the CE */ 444 if (!(napid->exec_map & (0x01 << i))) 445 continue; 446 447 /*double check that NAPI is allocated for the CE */ 448 exec_ctx = hif_exec_get_ctx(&napid->hif_softc->osc, i); 449 if (!(exec_ctx)) 450 continue; 451 452 if (bl_flag == true) 453 for (j = 0; j < exec_ctx->numirq; j++) 454 qdf_dev_modify_irq_status(exec_ctx->os_irq[j], 455 0, 456 QDF_IRQ_NO_BALANCING); 457 else 458 for (j = 0; j < exec_ctx->numirq; j++) 459 qdf_dev_modify_irq_status(exec_ctx->os_irq[j], 460 QDF_IRQ_NO_BALANCING, 461 0); 462 hif_debug("bl_flag %d CE %d", bl_flag, i); 463 } 464 } 465 466 /** 467 * hif_napi_cpu_blacklist() - en(dis)ables blacklisting for NAPI RX interrupts. 468 * @napid: pointer to qca_napi_data structure 469 * @op: blacklist operation to perform 470 * 471 * The function enables/disables/queries blacklisting for all CE RX 472 * interrupts with NAPI enabled. Besides blacklisting, it also enables/disables 473 * core_ctl_set_boost. 474 * Once blacklisting is enabled, the interrupts will not be managed by the IRQ 475 * balancer. 476 * 477 * Return: -EINVAL, in case IRQ_BLACKLISTING and CORE_CTL_BOOST is not enabled 478 * for BLACKLIST_QUERY op - blacklist refcount 479 * for BLACKLIST_ON op - return value from core_ctl_set_boost API 480 * for BLACKLIST_OFF op - return value from core_ctl_set_boost API 481 */ 482 int hif_exec_cpu_blacklist(struct qca_napi_data *napid, 483 enum qca_blacklist_op op) 484 { 485 int rc = 0; 486 static int ref_count; /* = 0 by the compiler */ 487 uint8_t flags = napid->flags; 488 bool bl_en = flags & QCA_NAPI_FEATURE_IRQ_BLACKLISTING; 489 bool ccb_en = flags & QCA_NAPI_FEATURE_CORE_CTL_BOOST; 490 491 NAPI_DEBUG("-->%s(%d %d)", __func__, flags, op); 492 493 if (!(bl_en && ccb_en)) { 494 rc = -EINVAL; 495 goto out; 496 } 497 498 switch (op) { 499 case BLACKLIST_QUERY: 500 rc = ref_count; 501 break; 502 case BLACKLIST_ON: 503 ref_count++; 504 rc = 0; 505 if (ref_count == 1) { 506 rc = hif_napi_core_ctl_set_boost(true); 507 NAPI_DEBUG("boost_on() returns %d - refcnt=%d", 508 rc, ref_count); 509 hif_exec_bl_irq(napid, true); 510 } 511 break; 512 case BLACKLIST_OFF: 513 if (ref_count) 514 ref_count--; 515 rc = 0; 516 if (ref_count == 0) { 517 rc = hif_napi_core_ctl_set_boost(false); 518 NAPI_DEBUG("boost_off() returns %d - refcnt=%d", 519 rc, ref_count); 520 hif_exec_bl_irq(napid, false); 521 } 522 break; 523 default: 524 NAPI_DEBUG("Invalid blacklist op: %d", op); 525 rc = -EINVAL; 526 } /* switch */ 527 out: 528 NAPI_DEBUG("<--%s[%d]", __func__, rc); 529 return rc; 530 } 531 532