1 /* 2 * Copyright (c) 2015-2017 The Linux Foundation. All rights reserved. 3 * 4 * Previously licensed under the ISC license by Qualcomm Atheros, Inc. 5 * 6 * 7 * Permission to use, copy, modify, and/or distribute this software for 8 * any purpose with or without fee is hereby granted, provided that the 9 * above copyright notice and this permission notice appear in all 10 * copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL 13 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED 14 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE 15 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 16 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 17 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 18 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 19 * PERFORMANCE OF THIS SOFTWARE. 20 */ 21 22 /* 23 * This file was originally distributed by Qualcomm Atheros, Inc. 24 * under proprietary terms before Copyright ownership was assigned 25 * to the Linux Foundation. 26 */ 27 28 /** 29 * DOC: hif_napi.c 30 * 31 * HIF NAPI interface implementation 32 */ 33 34 #include <string.h> /* memset */ 35 36 /* Linux headers */ 37 #include <linux/cpumask.h> 38 #include <linux/cpufreq.h> 39 #include <linux/cpu.h> 40 #include <linux/topology.h> 41 #include <linux/interrupt.h> 42 #include <linux/irq.h> 43 #ifdef HELIUMPLUS 44 #ifdef CONFIG_SCHED_CORE_CTL 45 #include <linux/sched/core_ctl.h> 46 #endif 47 #include <pld_snoc.h> 48 #endif 49 #include <linux/pm.h> 50 51 /* Driver headers */ 52 #include <hif_napi.h> 53 #include <hif_debug.h> 54 #include <hif_io32.h> 55 #include <ce_api.h> 56 #include <ce_internal.h> 57 58 enum napi_decision_vector { 59 HIF_NAPI_NOEVENT = 0, 60 HIF_NAPI_INITED = 1, 61 HIF_NAPI_CONF_UP = 2 62 }; 63 #define ENABLE_NAPI_MASK (HIF_NAPI_INITED | HIF_NAPI_CONF_UP) 64 65 #ifdef HELIUMPLUS 66 static inline int hif_get_irq_for_ce(int ce_id) 67 { 68 return pld_snoc_get_irq(ce_id); 69 } 70 #else /* HELIUMPLUS */ 71 static inline int hif_get_irq_for_ce(int ce_id) 72 { 73 return -EINVAL; 74 } 75 static int hif_napi_cpu_migrate(struct qca_napi_data *napid, int cpu, 76 int action) 77 { 78 return 0; 79 } 80 81 int hif_napi_cpu_blacklist(struct qca_napi_data *napid, 82 enum qca_blacklist_op op) 83 { 84 return 0; 85 } 86 #endif /* HELIUMPLUS */ 87 88 /** 89 * hif_napi_create() - creates the NAPI structures for a given CE 90 * @hif : pointer to hif context 91 * @pipe_id: the CE id on which the instance will be created 92 * @poll : poll function to be used for this NAPI instance 93 * @budget : budget to be registered with the NAPI instance 94 * @scale : scale factor on the weight (to scaler budget to 1000) 95 * @flags : feature flags 96 * 97 * Description: 98 * Creates NAPI instances. This function is called 99 * unconditionally during initialization. It creates 100 * napi structures through the proper HTC/HIF calls. 101 * The structures are disabled on creation. 102 * Note that for each NAPI instance a separate dummy netdev is used 103 * 104 * Return: 105 * < 0: error 106 * = 0: <should never happen> 107 * > 0: id of the created object (for multi-NAPI, number of objects created) 108 */ 109 int hif_napi_create(struct hif_opaque_softc *hif_ctx, 110 int (*poll)(struct napi_struct *, int), 111 int budget, 112 int scale, 113 uint8_t flags) 114 { 115 int i; 116 struct qca_napi_data *napid; 117 struct qca_napi_info *napii; 118 struct CE_state *ce_state; 119 struct hif_softc *hif = HIF_GET_SOFTC(hif_ctx); 120 int rc = 0; 121 122 NAPI_DEBUG("-->(budget=%d, scale=%d)", 123 budget, scale); 124 NAPI_DEBUG("hif->napi_data.state = 0x%08x", 125 hif->napi_data.state); 126 NAPI_DEBUG("hif->napi_data.ce_map = 0x%08x", 127 hif->napi_data.ce_map); 128 129 napid = &(hif->napi_data); 130 if (0 == (napid->state & HIF_NAPI_INITED)) { 131 memset(napid, 0, sizeof(struct qca_napi_data)); 132 qdf_spinlock_create(&(napid->lock)); 133 134 napid->state |= HIF_NAPI_INITED; 135 napid->flags = flags; 136 137 rc = hif_napi_cpu_init(hif_ctx); 138 if (rc != 0) { 139 HIF_ERROR("NAPI_initialization failed,. %d", rc); 140 goto hnc_err; 141 } 142 143 HIF_DBG("%s: NAPI structures initialized, rc=%d", 144 __func__, rc); 145 } 146 for (i = 0; i < hif->ce_count; i++) { 147 ce_state = hif->ce_id_to_state[i]; 148 NAPI_DEBUG("ce %d: htt_rx=%d htt_tx=%d", 149 i, ce_state->htt_rx_data, 150 ce_state->htt_tx_data); 151 if (!ce_state->htt_rx_data) 152 continue; 153 154 /* Now this is a CE where we need NAPI on */ 155 NAPI_DEBUG("Creating NAPI on pipe %d", i); 156 157 napii = &(napid->napis[i]); 158 memset(napii, 0, sizeof(struct qca_napi_info)); 159 napii->scale = scale; 160 napii->id = NAPI_PIPE2ID(i); 161 napii->hif_ctx = hif_ctx; 162 napii->irq = hif_get_irq_for_ce(i); 163 164 if (napii->irq < 0) 165 HIF_WARN("%s: bad IRQ value for CE %d: %d", 166 __func__, i, napii->irq); 167 168 qdf_spinlock_create(&napii->lro_unloading_lock); 169 init_dummy_netdev(&(napii->netdev)); 170 171 NAPI_DEBUG("adding napi=%p to netdev=%p (poll=%p, bdgt=%d)", 172 &(napii->napi), &(napii->netdev), poll, budget); 173 netif_napi_add(&(napii->netdev), &(napii->napi), poll, budget); 174 175 NAPI_DEBUG("after napi_add"); 176 NAPI_DEBUG("napi=0x%p, netdev=0x%p", 177 &(napii->napi), &(napii->netdev)); 178 NAPI_DEBUG("napi.dev_list.prev=0x%p, next=0x%p", 179 napii->napi.dev_list.prev, 180 napii->napi.dev_list.next); 181 NAPI_DEBUG("dev.napi_list.prev=0x%p, next=0x%p", 182 napii->netdev.napi_list.prev, 183 napii->netdev.napi_list.next); 184 185 /* It is OK to change the state variable below without 186 * protection as there should be no-one around yet 187 */ 188 napid->ce_map |= (0x01 << i); 189 HIF_DBG("%s: NAPI id %d created for pipe %d", __func__, 190 napii->id, i); 191 } 192 NAPI_DEBUG("NAPI ids created for all applicable pipes"); 193 hnc_err: 194 NAPI_DEBUG("<--napi_instances_map=%x]", napid->ce_map); 195 return napid->ce_map; 196 } 197 198 /** 199 * 200 * hif_napi_destroy() - destroys the NAPI structures for a given instance 201 * @hif : pointer to hif context 202 * @ce_id : the CE id whose napi instance will be destroyed 203 * @force : if set, will destroy even if entry is active (de-activates) 204 * 205 * Description: 206 * Destroy a given NAPI instance. This function is called 207 * unconditionally during cleanup. 208 * Refuses to destroy an entry of it is still enabled (unless force=1) 209 * Marks the whole napi_data invalid if all instances are destroyed. 210 * 211 * Return: 212 * -EINVAL: specific entry has not been created 213 * -EPERM : specific entry is still active 214 * 0 < : error 215 * 0 = : success 216 */ 217 int hif_napi_destroy(struct hif_opaque_softc *hif_ctx, 218 uint8_t id, 219 int force) 220 { 221 uint8_t ce = NAPI_ID2PIPE(id); 222 int rc = 0; 223 struct hif_softc *hif = HIF_GET_SOFTC(hif_ctx); 224 225 NAPI_DEBUG("-->(id=%d, force=%d)", id, force); 226 227 if (0 == (hif->napi_data.state & HIF_NAPI_INITED)) { 228 HIF_ERROR("%s: NAPI not initialized or entry %d not created", 229 __func__, id); 230 rc = -EINVAL; 231 } else if (0 == (hif->napi_data.ce_map & (0x01 << ce))) { 232 HIF_ERROR("%s: NAPI instance %d (pipe %d) not created", 233 __func__, id, ce); 234 rc = -EINVAL; 235 } else { 236 struct qca_napi_data *napid; 237 struct qca_napi_info *napii; 238 239 napid = &(hif->napi_data); 240 napii = &(napid->napis[ce]); 241 242 if (hif->napi_data.state == HIF_NAPI_CONF_UP) { 243 if (force) { 244 napi_disable(&(napii->napi)); 245 HIF_DBG("%s: NAPI entry %d force disabled", 246 __func__, id); 247 NAPI_DEBUG("NAPI %d force disabled", id); 248 } else { 249 HIF_ERROR("%s: Cannot destroy active NAPI %d", 250 __func__, id); 251 rc = -EPERM; 252 } 253 } 254 if (0 == rc) { 255 NAPI_DEBUG("before napi_del"); 256 NAPI_DEBUG("napi.dlist.prv=0x%p, next=0x%p", 257 napii->napi.dev_list.prev, 258 napii->napi.dev_list.next); 259 NAPI_DEBUG("dev.napi_l.prv=0x%p, next=0x%p", 260 napii->netdev.napi_list.prev, 261 napii->netdev.napi_list.next); 262 263 qdf_spinlock_destroy(&napii->lro_unloading_lock); 264 netif_napi_del(&(napii->napi)); 265 266 napid->ce_map &= ~(0x01 << ce); 267 napii->scale = 0; 268 HIF_DBG("%s: NAPI %d destroyed\n", __func__, id); 269 270 /* if there are no active instances and 271 * if they are all destroyed, 272 * set the whole structure to uninitialized state 273 */ 274 if (napid->ce_map == 0) { 275 rc = hif_napi_cpu_deinit(hif_ctx); 276 /* caller is tolerant to receiving !=0 rc */ 277 278 qdf_spinlock_destroy(&(napid->lock)); 279 memset(napid, 280 0, sizeof(struct qca_napi_data)); 281 HIF_DBG("%s: no NAPI instances. Zapped.", 282 __func__); 283 } 284 } 285 } 286 287 return rc; 288 } 289 290 /** 291 * hif_napi_lro_flush_cb_register() - init and register flush callback for LRO 292 * @hif_hdl: pointer to hif context 293 * @lro_flush_handler: register LRO flush callback 294 * @lro_init_handler: Callback for initializing LRO 295 * 296 * Return: positive value on success and 0 on failure 297 */ 298 int hif_napi_lro_flush_cb_register(struct hif_opaque_softc *hif_hdl, 299 void (lro_flush_handler)(void *), 300 void *(lro_init_handler)(void)) 301 { 302 int rc = 0; 303 int i; 304 struct CE_state *ce_state; 305 struct hif_softc *scn = HIF_GET_SOFTC(hif_hdl); 306 void *data = NULL; 307 struct qca_napi_data *napid; 308 struct qca_napi_info *napii; 309 310 QDF_ASSERT(scn != NULL); 311 312 napid = hif_napi_get_all(hif_hdl); 313 if (scn != NULL) { 314 for (i = 0; i < scn->ce_count; i++) { 315 ce_state = scn->ce_id_to_state[i]; 316 if ((ce_state != NULL) && (ce_state->htt_rx_data)) { 317 data = lro_init_handler(); 318 if (data == NULL) { 319 HIF_ERROR("%s: Failed to init LRO for CE %d", 320 __func__, i); 321 continue; 322 } 323 napii = &(napid->napis[i]); 324 napii->lro_flush_cb = lro_flush_handler; 325 napii->lro_ctx = data; 326 HIF_DBG("Registering LRO for ce_id %d NAPI callback for %d flush_cb %p, lro_data %p\n", 327 i, napii->id, napii->lro_flush_cb, 328 napii->lro_ctx); 329 rc++; 330 } 331 } 332 } else { 333 HIF_ERROR("%s: hif_state NULL!", __func__); 334 } 335 return rc; 336 } 337 338 /** 339 * hif_napi_lro_flush_cb_deregister() - Degregister and free LRO. 340 * @hif: pointer to hif context 341 * @lro_deinit_cb: LRO deinit callback 342 * 343 * Return: NONE 344 */ 345 void hif_napi_lro_flush_cb_deregister(struct hif_opaque_softc *hif_hdl, 346 void (lro_deinit_cb)(void *)) 347 { 348 int i; 349 struct CE_state *ce_state; 350 struct hif_softc *scn = HIF_GET_SOFTC(hif_hdl); 351 struct qca_napi_data *napid; 352 struct qca_napi_info *napii; 353 354 QDF_ASSERT(scn != NULL); 355 356 napid = hif_napi_get_all(hif_hdl); 357 if (scn != NULL) { 358 for (i = 0; i < scn->ce_count; i++) { 359 ce_state = scn->ce_id_to_state[i]; 360 if ((ce_state != NULL) && (ce_state->htt_rx_data)) { 361 napii = &(napid->napis[i]); 362 HIF_DBG("deRegistering LRO for ce_id %d NAPI callback for %d flush_cb %p, lro_data %p\n", 363 i, napii->id, napii->lro_flush_cb, 364 napii->lro_ctx); 365 qdf_spin_lock_bh(&napii->lro_unloading_lock); 366 napii->lro_flush_cb = NULL; 367 lro_deinit_cb(napii->lro_ctx); 368 napii->lro_ctx = NULL; 369 qdf_spin_unlock_bh( 370 &napii->lro_unloading_lock); 371 } 372 } 373 } else { 374 HIF_ERROR("%s: hif_state NULL!", __func__); 375 } 376 } 377 378 /** 379 * hif_napi_get_lro_info() - returns the address LRO data for napi_id 380 * @hif: pointer to hif context 381 * @napi_id: napi instance 382 * 383 * Description: 384 * Returns the address of the LRO structure 385 * 386 * Return: 387 * <addr>: address of the LRO structure 388 */ 389 void *hif_napi_get_lro_info(struct hif_opaque_softc *hif_hdl, int napi_id) 390 { 391 struct hif_softc *scn = HIF_GET_SOFTC(hif_hdl); 392 struct qca_napi_data *napid; 393 struct qca_napi_info *napii; 394 395 napid = &(scn->napi_data); 396 napii = &(napid->napis[NAPI_ID2PIPE(napi_id)]); 397 398 return napii->lro_ctx; 399 } 400 401 /** 402 * 403 * hif_napi_get_all() - returns the address of the whole HIF NAPI structure 404 * @hif: pointer to hif context 405 * 406 * Description: 407 * Returns the address of the whole structure 408 * 409 * Return: 410 * <addr>: address of the whole HIF NAPI structure 411 */ 412 inline struct qca_napi_data *hif_napi_get_all(struct hif_opaque_softc *hif_ctx) 413 { 414 struct hif_softc *hif = HIF_GET_SOFTC(hif_ctx); 415 416 return &(hif->napi_data); 417 } 418 419 /** 420 * 421 * hif_napi_event() - reacts to events that impact NAPI 422 * @hif : pointer to hif context 423 * @evnt: event that has been detected 424 * @data: more data regarding the event 425 * 426 * Description: 427 * This function handles two types of events: 428 * 1- Events that change the state of NAPI (enabled/disabled): 429 * {NAPI_EVT_INI_FILE, NAPI_EVT_CMD_STATE} 430 * The state is retrievable by "hdd_napi_enabled(-1)" 431 * - NAPI will be on if either INI file is on and it has not been disabled 432 * by a subsequent vendor CMD, 433 * or it has been enabled by a vendor CMD. 434 * 2- Events that change the CPU affinity of a NAPI instance/IRQ: 435 * {NAPI_EVT_TPUT_STATE, NAPI_EVT_CPU_STATE} 436 * - NAPI will support a throughput mode (HI/LO), kept at napid->napi_mode 437 * - NAPI will switch throughput mode based on hdd_napi_throughput_policy() 438 * - In LO tput mode, NAPI will yield control if its interrupts to the system 439 * management functions. However in HI throughput mode, NAPI will actively 440 * manage its interrupts/instances (by trying to disperse them out to 441 * separate performance cores). 442 * - CPU eligibility is kept up-to-date by NAPI_EVT_CPU_STATE events. 443 * 444 * + In some cases (roaming peer management is the only case so far), a 445 * a client can trigger a "SERIALIZE" event. Basically, this means that the 446 * users is asking NAPI to go into a truly single execution context state. 447 * So, NAPI indicates to msm-irqbalancer that it wants to be blacklisted, 448 * (if called for the first time) and then moves all IRQs (for NAPI 449 * instances) to be collapsed to a single core. If called multiple times, 450 * it will just re-collapse the CPUs. This is because blacklist-on() API 451 * is reference-counted, and because the API has already been called. 452 * 453 * Such a user, should call "DESERIALIZE" (NORMAL) event, to set NAPI to go 454 * to its "normal" operation. Optionally, they can give a timeout value (in 455 * multiples of BusBandwidthCheckPeriod -- 100 msecs by default). In this 456 * case, NAPI will just set the current throughput state to uninitialized 457 * and set the delay period. Once policy handler is called, it would skip 458 * applying the policy delay period times, and otherwise apply the policy. 459 * 460 * Return: 461 * < 0: some error 462 * = 0: event handled successfully 463 */ 464 int hif_napi_event(struct hif_opaque_softc *hif_ctx, enum qca_napi_event event, 465 void *data) 466 { 467 int rc = 0; 468 uint32_t prev_state; 469 int i; 470 struct napi_struct *napi; 471 struct hif_softc *hif = HIF_GET_SOFTC(hif_ctx); 472 struct qca_napi_data *napid = &(hif->napi_data); 473 enum qca_napi_tput_state tput_mode = QCA_NAPI_TPUT_UNINITIALIZED; 474 enum { 475 BLACKLIST_NOT_PENDING, 476 BLACKLIST_ON_PENDING, 477 BLACKLIST_OFF_PENDING 478 } blacklist_pending = BLACKLIST_NOT_PENDING; 479 480 NAPI_DEBUG("%s: -->(event=%d, aux=%p)", __func__, event, data); 481 482 if ((napid->state & HIF_NAPI_INITED) == 0) { 483 NAPI_DEBUG("%s: got event when NAPI not initialized", 484 __func__); 485 return -EINVAL; 486 } 487 qdf_spin_lock_bh(&(napid->lock)); 488 prev_state = napid->state; 489 switch (event) { 490 case NAPI_EVT_INI_FILE: 491 case NAPI_EVT_CMD_STATE: 492 case NAPI_EVT_INT_STATE: { 493 int on = (data != ((void *)0)); 494 495 HIF_DBG("%s: recved evnt: STATE_CMD %d; v = %d (state=0x%0x)", 496 __func__, event, 497 on, prev_state); 498 if (on) 499 if (prev_state & HIF_NAPI_CONF_UP) { 500 HIF_DBG("%s: duplicate NAPI conf ON msg", 501 __func__); 502 } else { 503 HIF_DBG("%s: setting state to ON", 504 __func__); 505 napid->state |= HIF_NAPI_CONF_UP; 506 } 507 else /* off request */ 508 if (prev_state & HIF_NAPI_CONF_UP) { 509 HIF_DBG("%s: setting state to OFF", 510 __func__); 511 napid->state &= ~HIF_NAPI_CONF_UP; 512 } else { 513 HIF_DBG("%s: duplicate NAPI conf OFF msg", 514 __func__); 515 } 516 break; 517 } 518 /* case NAPI_INIT_FILE/CMD_STATE */ 519 520 case NAPI_EVT_CPU_STATE: { 521 int cpu = ((unsigned long int)data >> 16); 522 int val = ((unsigned long int)data & 0x0ff); 523 524 NAPI_DEBUG("%s: evt=CPU_STATE on CPU %d value=%d", 525 __func__, cpu, val); 526 527 /* state has already been set by hnc_cpu_notify_cb */ 528 if ((val == QCA_NAPI_CPU_DOWN) && 529 (napid->napi_mode == QCA_NAPI_TPUT_HI) && /* we manage */ 530 (napid->napi_cpu[cpu].napis != 0)) { 531 NAPI_DEBUG("%s: Migrating NAPIs out of cpu %d", 532 __func__, cpu); 533 rc = hif_napi_cpu_migrate(napid, 534 cpu, 535 HNC_ACT_RELOCATE); 536 napid->napi_cpu[cpu].napis = 0; 537 } 538 /* in QCA_NAPI_TPUT_LO case, napis MUST == 0 */ 539 break; 540 } 541 542 case NAPI_EVT_TPUT_STATE: { 543 tput_mode = (enum qca_napi_tput_state)data; 544 if (tput_mode == QCA_NAPI_TPUT_LO) { 545 /* from TPUT_HI -> TPUT_LO */ 546 NAPI_DEBUG("%s: Moving to napi_tput_LO state", 547 __func__); 548 blacklist_pending = BLACKLIST_OFF_PENDING; 549 /* 550 * Ideally we should "collapse" interrupts here, since 551 * we are "dispersing" interrupts in the "else" case. 552 * This allows the possibility that our interrupts may 553 * still be on the perf cluster the next time we enter 554 * high tput mode. However, the irq_balancer is free 555 * to move our interrupts to power cluster once 556 * blacklisting has been turned off in the "else" case. 557 */ 558 } else { 559 /* from TPUT_LO -> TPUT->HI */ 560 NAPI_DEBUG("%s: Moving to napi_tput_HI state", 561 __func__); 562 rc = hif_napi_cpu_migrate(napid, 563 HNC_ANY_CPU, 564 HNC_ACT_DISPERSE); 565 566 blacklist_pending = BLACKLIST_ON_PENDING; 567 } 568 napid->napi_mode = tput_mode; 569 break; 570 } 571 572 case NAPI_EVT_USR_SERIAL: { 573 unsigned long users = (unsigned long)data; 574 575 NAPI_DEBUG("%s: User forced SERIALIZATION; users=%ld", 576 __func__, users); 577 578 rc = hif_napi_cpu_migrate(napid, 579 HNC_ANY_CPU, 580 HNC_ACT_COLLAPSE); 581 if ((users == 0) && (rc == 0)) 582 blacklist_pending = BLACKLIST_ON_PENDING; 583 break; 584 } 585 case NAPI_EVT_USR_NORMAL: { 586 NAPI_DEBUG("%s: User forced DE-SERIALIZATION", __func__); 587 /* 588 * Deserialization timeout is handled at hdd layer; 589 * just mark current mode to uninitialized to ensure 590 * it will be set when the delay is over 591 */ 592 napid->napi_mode = QCA_NAPI_TPUT_UNINITIALIZED; 593 break; 594 } 595 default: { 596 HIF_ERROR("%s: unknown event: %d (data=0x%0lx)", 597 __func__, event, (unsigned long) data); 598 break; 599 } /* default */ 600 }; /* switch */ 601 602 603 switch (blacklist_pending) { 604 case BLACKLIST_ON_PENDING: 605 /* assume the control of WLAN IRQs */ 606 hif_napi_cpu_blacklist(napid, BLACKLIST_ON); 607 break; 608 case BLACKLIST_OFF_PENDING: 609 /* yield the control of WLAN IRQs */ 610 hif_napi_cpu_blacklist(napid, BLACKLIST_OFF); 611 break; 612 default: /* nothing to do */ 613 break; 614 } /* switch blacklist_pending */ 615 616 qdf_spin_unlock_bh(&(napid->lock)); 617 618 if (prev_state != napid->state) { 619 if (napid->state == ENABLE_NAPI_MASK) { 620 rc = 1; 621 for (i = 0; i < CE_COUNT_MAX; i++) 622 if ((napid->ce_map & (0x01 << i))) { 623 napi = &(napid->napis[i].napi); 624 NAPI_DEBUG("%s: enabling NAPI %d", 625 __func__, i); 626 napi_enable(napi); 627 } 628 } else { 629 rc = 0; 630 for (i = 0; i < CE_COUNT_MAX; i++) 631 if (napid->ce_map & (0x01 << i)) { 632 napi = &(napid->napis[i].napi); 633 NAPI_DEBUG("%s: disabling NAPI %d", 634 __func__, i); 635 napi_disable(napi); 636 /* in case it is affined, remove it */ 637 irq_set_affinity_hint( 638 napid->napis[i].irq, 639 NULL); 640 } 641 } 642 } else { 643 HIF_DBG("%s: no change in hif napi state (still %d)", 644 __func__, prev_state); 645 } 646 647 NAPI_DEBUG("<--[rc=%d]", rc); 648 return rc; 649 } 650 651 /** 652 * hif_napi_enabled() - checks whether NAPI is enabled for given ce or not 653 * @hif: hif context 654 * @ce : CE instance (or -1, to check if any CEs are enabled) 655 * 656 * Return: bool 657 */ 658 int hif_napi_enabled(struct hif_opaque_softc *hif_ctx, int ce) 659 { 660 int rc; 661 struct hif_softc *hif = HIF_GET_SOFTC(hif_ctx); 662 663 if (-1 == ce) 664 rc = ((hif->napi_data.state == ENABLE_NAPI_MASK)); 665 else 666 rc = ((hif->napi_data.state == ENABLE_NAPI_MASK) && 667 (hif->napi_data.ce_map & (0x01 << ce))); 668 return rc; 669 }; 670 671 /** 672 * hif_napi_enable_irq() - enables bus interrupts after napi_complete 673 * 674 * @hif: hif context 675 * @id : id of NAPI instance calling this (used to determine the CE) 676 * 677 * Return: void 678 */ 679 inline void hif_napi_enable_irq(struct hif_opaque_softc *hif, int id) 680 { 681 struct hif_softc *scn = HIF_GET_SOFTC(hif); 682 683 hif_irq_enable(scn, NAPI_ID2PIPE(id)); 684 } 685 686 687 /** 688 * hif_napi_schedule() - schedules napi, updates stats 689 * @scn: hif context 690 * @ce_id: index of napi instance 691 * 692 * Return: void 693 */ 694 int hif_napi_schedule(struct hif_opaque_softc *hif_ctx, int ce_id) 695 { 696 int cpu = smp_processor_id(); 697 struct hif_softc *scn = HIF_GET_SOFTC(hif_ctx); 698 699 hif_record_ce_desc_event(scn, ce_id, NAPI_SCHEDULE, 700 NULL, NULL, 0); 701 702 scn->napi_data.napis[ce_id].stats[cpu].napi_schedules++; 703 NAPI_DEBUG("scheduling napi %d (ce:%d)", 704 scn->napi_data.napis[ce_id].id, ce_id); 705 napi_schedule(&(scn->napi_data.napis[ce_id].napi)); 706 707 return true; 708 } 709 710 /** 711 * hif_napi_correct_cpu() - correct the interrupt affinity for napi if needed 712 * @napi_info: pointer to qca_napi_info for the napi instance 713 * 714 * Return: true => interrupt already on correct cpu, no correction needed 715 * false => interrupt on wrong cpu, correction done for cpu affinity 716 * of the interrupt 717 */ 718 static inline 719 bool hif_napi_correct_cpu(struct qca_napi_info *napi_info) 720 { 721 bool right_cpu = true; 722 int rc = 0; 723 cpumask_t cpumask; 724 int cpu; 725 struct qca_napi_data *napid; 726 727 napid = hif_napi_get_all(GET_HIF_OPAQUE_HDL(napi_info->hif_ctx)); 728 729 if (napid->flags & QCA_NAPI_FEATURE_CPU_CORRECTION) { 730 731 cpu = qdf_get_cpu(); 732 if (unlikely((hif_napi_cpu_blacklist(napid, 733 BLACKLIST_QUERY) > 0) && 734 (cpu != napi_info->cpu))) { 735 right_cpu = false; 736 737 NAPI_DEBUG("interrupt on wrong CPU, correcting"); 738 cpumask.bits[0] = (0x01 << napi_info->cpu); 739 740 irq_modify_status(napi_info->irq, IRQ_NO_BALANCING, 0); 741 rc = irq_set_affinity_hint(napi_info->irq, 742 &cpumask); 743 irq_modify_status(napi_info->irq, 0, IRQ_NO_BALANCING); 744 745 if (rc) 746 HIF_ERROR("error setting irq affinity hint: %d", 747 rc); 748 else 749 napi_info->stats[cpu].cpu_corrected++; 750 } 751 } 752 return right_cpu; 753 } 754 755 /** 756 * hif_napi_poll() - NAPI poll routine 757 * @napi : pointer to NAPI struct as kernel holds it 758 * @budget: 759 * 760 * This is the body of the poll function. 761 * The poll function is called by kernel. So, there is a wrapper 762 * function in HDD, which in turn calls this function. 763 * Two main reasons why the whole thing is not implemented in HDD: 764 * a) references to things like ce_service that HDD is not aware of 765 * b) proximity to the implementation of ce_tasklet, which the body 766 * of this function should be very close to. 767 * 768 * NOTE TO THE MAINTAINER: 769 * Consider this function and ce_tasklet very tightly coupled pairs. 770 * Any changes to ce_tasklet or this function may likely need to be 771 * reflected in the counterpart. 772 * 773 * Returns: 774 * int: the amount of work done in this poll (<= budget) 775 */ 776 int hif_napi_poll(struct hif_opaque_softc *hif_ctx, 777 struct napi_struct *napi, 778 int budget) 779 { 780 int rc = 0; /* default: no work done, also takes care of error */ 781 int normalized = 0; 782 int bucket; 783 int cpu = smp_processor_id(); 784 bool poll_on_right_cpu; 785 struct hif_softc *hif = HIF_GET_SOFTC(hif_ctx); 786 struct qca_napi_info *napi_info; 787 struct CE_state *ce_state = NULL; 788 789 NAPI_DEBUG("%s -->(napi(%d, irq=%d), budget=%d)", 790 __func__, napi_info->id, napi_info->irq, budget); 791 792 if (unlikely(NULL == hif)) { 793 HIF_ERROR("%s: hif context is NULL", __func__); 794 QDF_ASSERT(0); 795 goto out; 796 } 797 798 napi_info = (struct qca_napi_info *) 799 container_of(napi, struct qca_napi_info, napi); 800 801 napi_info->stats[cpu].napi_polls++; 802 803 hif_record_ce_desc_event(hif, NAPI_ID2PIPE(napi_info->id), 804 NAPI_POLL_ENTER, NULL, NULL, cpu); 805 806 qdf_spin_lock_bh(&napi_info->lro_unloading_lock); 807 808 rc = ce_per_engine_service(hif, NAPI_ID2PIPE(napi_info->id)); 809 NAPI_DEBUG("%s: ce_per_engine_service processed %d msgs", 810 __func__, rc); 811 812 if (napi_info->lro_flush_cb) 813 napi_info->lro_flush_cb(napi_info->lro_ctx); 814 qdf_spin_unlock_bh(&napi_info->lro_unloading_lock); 815 816 /* do not return 0, if there was some work done, 817 * even if it is below the scale 818 */ 819 if (rc) { 820 napi_info->stats[cpu].napi_workdone += rc; 821 normalized = (rc / napi_info->scale); 822 if (normalized == 0) 823 normalized++; 824 bucket = normalized / (QCA_NAPI_BUDGET / QCA_NAPI_NUM_BUCKETS); 825 if (bucket >= QCA_NAPI_NUM_BUCKETS) { 826 bucket = QCA_NAPI_NUM_BUCKETS - 1; 827 HIF_ERROR("Bad bucket#(%d) > QCA_NAPI_NUM_BUCKETS(%d)", 828 bucket, QCA_NAPI_NUM_BUCKETS); 829 } 830 napi_info->stats[cpu].napi_budget_uses[bucket]++; 831 } else { 832 /* if ce_per engine reports 0, then poll should be terminated */ 833 NAPI_DEBUG("%s:%d: nothing processed by CE. Completing NAPI", 834 __func__, __LINE__); 835 } 836 837 ce_state = hif->ce_id_to_state[NAPI_ID2PIPE(napi_info->id)]; 838 839 /* 840 * Not using the API hif_napi_correct_cpu directly in the if statement 841 * below since the API may not get evaluated if put at the end if any 842 * prior condition would evaluate to be true. The CPU correction 843 * check should kick in every poll. 844 */ 845 #ifdef NAPI_YIELD_BUDGET_BASED 846 if (ce_state && (ce_state->force_break || 0 == rc)) { 847 #else 848 poll_on_right_cpu = hif_napi_correct_cpu(napi_info); 849 if ((ce_state) && 850 (!ce_check_rx_pending(ce_state) || (0 == rc) || 851 !poll_on_right_cpu)) { 852 #endif 853 napi_info->stats[cpu].napi_completes++; 854 #ifdef NAPI_YIELD_BUDGET_BASED 855 ce_state->force_break = 0; 856 #endif 857 858 hif_record_ce_desc_event(hif, ce_state->id, NAPI_COMPLETE, 859 NULL, NULL, 0); 860 if (normalized >= budget) 861 normalized = budget - 1; 862 863 /* enable interrupts */ 864 napi_complete(napi); 865 hif_napi_enable_irq(hif_ctx, napi_info->id); 866 /* support suspend/resume */ 867 qdf_atomic_dec(&(hif->active_tasklet_cnt)); 868 869 NAPI_DEBUG("%s:%d: napi_complete + enabling the interrupts", 870 __func__, __LINE__); 871 } else { 872 /* 4.4 kernel NAPI implementation requires drivers to 873 * return full work when they ask to be re-scheduled, 874 * or napi_complete and re-start with a fresh interrupt 875 */ 876 normalized = budget; 877 } 878 879 hif_record_ce_desc_event(hif, NAPI_ID2PIPE(napi_info->id), 880 NAPI_POLL_EXIT, NULL, NULL, normalized); 881 882 NAPI_DEBUG("%s <--[normalized=%d]", __func__, normalized); 883 return normalized; 884 out: 885 return rc; 886 } 887 888 #ifdef HELIUMPLUS 889 /** 890 * 891 * hif_napi_update_yield_stats() - update NAPI yield related stats 892 * @cpu_id: CPU ID for which stats needs to be updates 893 * @ce_id: Copy Engine ID for which yield stats needs to be updates 894 * @time_limit_reached: indicates whether the time limit was reached 895 * @rxpkt_thresh_reached: indicates whether rx packet threshold was reached 896 * 897 * Return: None 898 */ 899 void hif_napi_update_yield_stats(struct CE_state *ce_state, 900 bool time_limit_reached, 901 bool rxpkt_thresh_reached) 902 { 903 struct hif_softc *hif; 904 struct qca_napi_data *napi_data = NULL; 905 int ce_id = 0; 906 int cpu_id = 0; 907 908 if (unlikely(NULL == ce_state)) { 909 QDF_ASSERT(NULL != ce_state); 910 return; 911 } 912 913 hif = ce_state->scn; 914 915 if (unlikely(NULL == hif)) { 916 QDF_ASSERT(NULL != hif); 917 return; 918 } 919 napi_data = &(hif->napi_data); 920 if (unlikely(NULL == napi_data)) { 921 QDF_ASSERT(NULL != napi_data); 922 return; 923 } 924 925 ce_id = ce_state->id; 926 cpu_id = qdf_get_cpu(); 927 928 if (time_limit_reached) 929 napi_data->napis[ce_id].stats[cpu_id].time_limit_reached++; 930 else 931 napi_data->napis[ce_id].stats[cpu_id].rxpkt_thresh_reached++; 932 } 933 934 /** 935 * 936 * hif_napi_stats() - display NAPI CPU statistics 937 * @napid: pointer to qca_napi_data 938 * 939 * Description: 940 * Prints the various CPU cores on which the NAPI instances /CEs interrupts 941 * are being executed. Can be called from outside NAPI layer. 942 * 943 * Return: None 944 */ 945 void hif_napi_stats(struct qca_napi_data *napid) 946 { 947 int i; 948 struct qca_napi_cpu *cpu; 949 950 if (napid == NULL) { 951 qdf_print("%s: napiid struct is null", __func__); 952 return; 953 } 954 955 cpu = napid->napi_cpu; 956 qdf_print("NAPI CPU TABLE"); 957 qdf_print("lilclhead=%d, bigclhead=%d", 958 napid->lilcl_head, napid->bigcl_head); 959 for (i = 0; i < NR_CPUS; i++) { 960 qdf_print("CPU[%02d]: state:%d crid=%02d clid=%02d crmk:0x%0lx thmk:0x%0lx frq:%d napi = 0x%08x lnk:%d", 961 i, 962 cpu[i].state, cpu[i].core_id, cpu[i].cluster_id, 963 cpu[i].core_mask.bits[0], 964 cpu[i].thread_mask.bits[0], 965 cpu[i].max_freq, cpu[i].napis, 966 cpu[i].cluster_nxt); 967 } 968 } 969 970 #ifdef FEATURE_NAPI_DEBUG 971 /* 972 * Local functions 973 * - no argument checks, all internal/trusted callers 974 */ 975 static void hnc_dump_cpus(struct qca_napi_data *napid) 976 { 977 hif_napi_stats(napid); 978 } 979 #else 980 static void hnc_dump_cpus(struct qca_napi_data *napid) { /* no-op */ }; 981 #endif /* FEATURE_NAPI_DEBUG */ 982 /** 983 * hnc_link_clusters() - partitions to cpu table into clusters 984 * @napid: pointer to NAPI data 985 * 986 * Takes in a CPU topology table and builds two linked lists 987 * (big cluster cores, list-head at bigcl_head, and little cluster 988 * cores, list-head at lilcl_head) out of it. 989 * 990 * If there are more than two clusters: 991 * - bigcl_head and lilcl_head will be different, 992 * - the cluster with highest cpufreq will be considered the "big" cluster. 993 * If there are more than one with the highest frequency, the *last* of such 994 * clusters will be designated as the "big cluster" 995 * - the cluster with lowest cpufreq will be considered the "li'l" cluster. 996 * If there are more than one clusters with the lowest cpu freq, the *first* 997 * of such clusters will be designated as the "little cluster" 998 * - We only support up to 32 clusters 999 * Return: 0 : OK 1000 * !0: error (at least one of lil/big clusters could not be found) 1001 */ 1002 #define HNC_MIN_CLUSTER 0 1003 #define HNC_MAX_CLUSTER 31 1004 static int hnc_link_clusters(struct qca_napi_data *napid) 1005 { 1006 int rc = 0; 1007 1008 int i; 1009 int it = 0; 1010 uint32_t cl_done = 0x0; 1011 int cl, curcl, curclhead = 0; 1012 int more; 1013 unsigned int lilfrq = INT_MAX; 1014 unsigned int bigfrq = 0; 1015 unsigned int clfrq = 0; 1016 int prev = 0; 1017 struct qca_napi_cpu *cpus = napid->napi_cpu; 1018 1019 napid->lilcl_head = napid->bigcl_head = -1; 1020 1021 do { 1022 more = 0; 1023 it++; curcl = -1; 1024 for (i = 0; i < NR_CPUS; i++) { 1025 cl = cpus[i].cluster_id; 1026 NAPI_DEBUG("Processing cpu[%d], cluster=%d\n", 1027 i, cl); 1028 if ((cl < HNC_MIN_CLUSTER) || (cl > HNC_MAX_CLUSTER)) { 1029 NAPI_DEBUG("Bad cluster (%d). SKIPPED\n", cl); 1030 QDF_ASSERT(0); 1031 /* continue if ASSERTs are disabled */ 1032 continue; 1033 }; 1034 if (cpumask_weight(&(cpus[i].core_mask)) == 0) { 1035 NAPI_DEBUG("Core mask 0. SKIPPED\n"); 1036 continue; 1037 } 1038 if (cl_done & (0x01 << cl)) { 1039 NAPI_DEBUG("Cluster already processed. SKIPPED\n"); 1040 continue; 1041 } else { 1042 if (more == 0) { 1043 more = 1; 1044 curcl = cl; 1045 curclhead = i; /* row */ 1046 clfrq = cpus[i].max_freq; 1047 prev = -1; 1048 }; 1049 if ((curcl >= 0) && (curcl != cl)) { 1050 NAPI_DEBUG("Entry cl(%d) != curcl(%d). SKIPPED\n", 1051 cl, curcl); 1052 continue; 1053 } 1054 if (cpus[i].max_freq != clfrq) 1055 NAPI_DEBUG("WARN: frq(%d)!=clfrq(%d)\n", 1056 cpus[i].max_freq, clfrq); 1057 if (clfrq >= bigfrq) { 1058 bigfrq = clfrq; 1059 napid->bigcl_head = curclhead; 1060 NAPI_DEBUG("bigcl=%d\n", curclhead); 1061 } 1062 if (clfrq < lilfrq) { 1063 lilfrq = clfrq; 1064 napid->lilcl_head = curclhead; 1065 NAPI_DEBUG("lilcl=%d\n", curclhead); 1066 } 1067 if (prev != -1) 1068 cpus[prev].cluster_nxt = i; 1069 1070 prev = i; 1071 } 1072 } 1073 if (curcl >= 0) 1074 cl_done |= (0x01 << curcl); 1075 1076 } while (more); 1077 1078 if (qdf_unlikely((napid->lilcl_head < 0) && (napid->bigcl_head < 0))) 1079 rc = -EFAULT; 1080 1081 hnc_dump_cpus(napid); /* if NAPI_DEBUG */ 1082 return rc; 1083 } 1084 #undef HNC_MIN_CLUSTER 1085 #undef HNC_MAX_CLUSTER 1086 1087 /* 1088 * hotplug function group 1089 */ 1090 1091 /** 1092 * hnc_cpu_notify_cb() - handles CPU hotplug events 1093 * 1094 * On transitions to online, we onlu handle the ONLINE event, 1095 * and ignore the PREP events, because we dont want to act too 1096 * early. 1097 * On transtion to offline, we act on PREP events, because 1098 * we may need to move the irqs/NAPIs to another CPU before 1099 * it is actually off-lined. 1100 * 1101 * Return: NOTIFY_OK (dont block action) 1102 */ 1103 static int hnc_cpu_notify_cb(struct notifier_block *nb, 1104 unsigned long action, 1105 void *hcpu) 1106 { 1107 int rc = NOTIFY_OK; 1108 unsigned long cpu = (unsigned long)hcpu; 1109 struct hif_opaque_softc *hif; 1110 struct qca_napi_data *napid = NULL; 1111 1112 NAPI_DEBUG("-->%s(act=%ld, cpu=%ld)", __func__, action, cpu); 1113 1114 napid = qdf_container_of(nb, struct qca_napi_data, hnc_cpu_notifier); 1115 hif = &qdf_container_of(napid, struct hif_softc, napi_data)->osc; 1116 1117 switch (action) { 1118 case CPU_ONLINE: 1119 napid->napi_cpu[cpu].state = QCA_NAPI_CPU_UP; 1120 NAPI_DEBUG("%s: CPU %ld marked %d", 1121 __func__, cpu, napid->napi_cpu[cpu].state); 1122 break; 1123 case CPU_DEAD: /* already dead; we have marked it before, but ... */ 1124 case CPU_DEAD_FROZEN: 1125 napid->napi_cpu[cpu].state = QCA_NAPI_CPU_DOWN; 1126 NAPI_DEBUG("%s: CPU %ld marked %d", 1127 __func__, cpu, napid->napi_cpu[cpu].state); 1128 break; 1129 case CPU_DOWN_PREPARE: 1130 case CPU_DOWN_PREPARE_FROZEN: 1131 napid->napi_cpu[cpu].state = QCA_NAPI_CPU_DOWN; 1132 1133 NAPI_DEBUG("%s: CPU %ld marked %d; updating affinity", 1134 __func__, cpu, napid->napi_cpu[cpu].state); 1135 1136 /** 1137 * we need to move any NAPIs on this CPU out. 1138 * if we are in LO throughput mode, then this is valid 1139 * if the CPU is the the low designated CPU. 1140 */ 1141 hif_napi_event(hif, 1142 NAPI_EVT_CPU_STATE, 1143 (void *) 1144 ((cpu << 16) | napid->napi_cpu[cpu].state)); 1145 break; 1146 default: 1147 NAPI_DEBUG("%s: ignored. action: %ld", __func__, action); 1148 break; 1149 } /* switch */ 1150 NAPI_DEBUG("<--%s [%d]", __func__, rc); 1151 return rc; 1152 } 1153 1154 /** 1155 * hnc_hotplug_hook() - installs a hotplug notifier 1156 * @hif_sc: hif_sc context 1157 * @register: !0 => register , =0 => deregister 1158 * 1159 * Because the callback relies on the data layout of 1160 * struct hif_softc & its napi_data member, this callback 1161 * registration requires that the hif_softc is passed in. 1162 * 1163 * Note that this is different from the cpu notifier used by 1164 * rx_thread (cds_schedule.c). 1165 * We may consider combining these modifiers in the future. 1166 * 1167 * Return: 0: success 1168 * <0: error 1169 */ 1170 static int hnc_hotplug_hook(struct hif_softc *hif_sc, int install) 1171 { 1172 int rc = 0; 1173 1174 NAPI_DEBUG("-->%s(%d)", __func__, install); 1175 1176 if (install) { 1177 hif_sc->napi_data.hnc_cpu_notifier.notifier_call 1178 = hnc_cpu_notify_cb; 1179 rc = register_hotcpu_notifier( 1180 &hif_sc->napi_data.hnc_cpu_notifier); 1181 } else { 1182 unregister_hotcpu_notifier( 1183 &hif_sc->napi_data.hnc_cpu_notifier); 1184 } 1185 1186 NAPI_DEBUG("<--%s()[%d]", __func__, rc); 1187 return rc; 1188 } 1189 1190 /** 1191 * hnc_install_tput() - installs a callback in the throughput detector 1192 * @register: !0 => register; =0: unregister 1193 * 1194 * installs a callback to be called when wifi driver throughput (tx+rx) 1195 * crosses a threshold. Currently, we are using the same criteria as 1196 * TCP ack suppression (500 packets/100ms by default). 1197 * 1198 * Return: 0 : success 1199 * <0: failure 1200 */ 1201 1202 static int hnc_tput_hook(int install) 1203 { 1204 int rc = 0; 1205 1206 /* 1207 * Nothing, until the bw_calculation accepts registration 1208 * it is now hardcoded in the wlan_hdd_main.c::hdd_bus_bw_compute_cbk 1209 * hdd_napi_throughput_policy(...) 1210 */ 1211 return rc; 1212 } 1213 1214 /* 1215 * Implementation of hif_napi_cpu API 1216 */ 1217 1218 /** 1219 * hif_napi_cpu_init() - initialization of irq affinity block 1220 * @ctx: pointer to qca_napi_data 1221 * 1222 * called by hif_napi_create, after the first instance is called 1223 * - builds napi_rss_cpus table from cpu topology 1224 * - links cores of the same clusters together 1225 * - installs hot-plug notifier 1226 * - installs throughput trigger notifier (when such mechanism exists) 1227 * 1228 * Return: 0: OK 1229 * <0: error code 1230 */ 1231 int hif_napi_cpu_init(struct hif_opaque_softc *hif) 1232 { 1233 int rc = 0; 1234 int i; 1235 struct qca_napi_data *napid = &HIF_GET_SOFTC(hif)->napi_data; 1236 struct qca_napi_cpu *cpus = napid->napi_cpu; 1237 1238 NAPI_DEBUG("--> "); 1239 1240 if (cpus[0].state != QCA_NAPI_CPU_UNINITIALIZED) { 1241 NAPI_DEBUG("NAPI RSS table already initialized.\n"); 1242 rc = -EALREADY; 1243 goto lab_rss_init; 1244 } 1245 1246 /* build CPU topology table */ 1247 for_each_possible_cpu(i) { 1248 cpus[i].state = ((cpumask_test_cpu(i, cpu_online_mask) 1249 ? QCA_NAPI_CPU_UP 1250 : QCA_NAPI_CPU_DOWN)); 1251 cpus[i].core_id = topology_core_id(i); 1252 cpus[i].cluster_id = topology_physical_package_id(i); 1253 cpumask_copy(&(cpus[i].core_mask), 1254 topology_core_cpumask(i)); 1255 cpumask_copy(&(cpus[i].thread_mask), 1256 topology_sibling_cpumask(i)); 1257 cpus[i].max_freq = cpufreq_quick_get_max(i); 1258 cpus[i].napis = 0x0; 1259 cpus[i].cluster_nxt = -1; /* invalid */ 1260 } 1261 1262 /* link clusters together */ 1263 rc = hnc_link_clusters(napid); 1264 if (0 != rc) 1265 goto lab_err_topology; 1266 1267 /* install hotplug notifier */ 1268 rc = hnc_hotplug_hook(HIF_GET_SOFTC(hif), 1); 1269 if (0 != rc) 1270 goto lab_err_hotplug; 1271 1272 /* install throughput notifier */ 1273 rc = hnc_tput_hook(1); 1274 if (0 == rc) 1275 goto lab_rss_init; 1276 1277 lab_err_hotplug: 1278 hnc_tput_hook(0); 1279 hnc_hotplug_hook(HIF_GET_SOFTC(hif), 0); 1280 lab_err_topology: 1281 memset(napid->napi_cpu, 0, sizeof(struct qca_napi_cpu) * NR_CPUS); 1282 lab_rss_init: 1283 NAPI_DEBUG("<-- [rc=%d]", rc); 1284 return rc; 1285 } 1286 1287 /** 1288 * hif_napi_cpu_deinit() - clean-up of irq affinity block 1289 * 1290 * called by hif_napi_destroy, when the last instance is removed 1291 * - uninstalls throughput and hotplug notifiers 1292 * - clears cpu topology table 1293 * Return: 0: OK 1294 */ 1295 int hif_napi_cpu_deinit(struct hif_opaque_softc *hif) 1296 { 1297 int rc = 0; 1298 struct qca_napi_data *napid = &HIF_GET_SOFTC(hif)->napi_data; 1299 1300 NAPI_DEBUG("-->%s(...)", __func__); 1301 1302 /* uninstall tput notifier */ 1303 rc = hnc_tput_hook(0); 1304 1305 /* uninstall hotplug notifier */ 1306 rc = hnc_hotplug_hook(HIF_GET_SOFTC(hif), 0); 1307 1308 /* clear the topology table */ 1309 memset(napid->napi_cpu, 0, sizeof(struct qca_napi_cpu) * NR_CPUS); 1310 1311 NAPI_DEBUG("<--%s[rc=%d]", __func__, rc); 1312 1313 return rc; 1314 } 1315 1316 /** 1317 * hncm_migrate_to() - migrates a NAPI to a CPU 1318 * @napid: pointer to NAPI block 1319 * @ce_id: CE_id of the NAPI instance 1320 * @didx : index in the CPU topology table for the CPU to migrate to 1321 * 1322 * Migrates NAPI (identified by the CE_id) to the destination core 1323 * Updates the napi_map of the destination entry 1324 * 1325 * Return: 1326 * =0 : success 1327 * <0 : error 1328 */ 1329 static int hncm_migrate_to(struct qca_napi_data *napid, 1330 int napi_ce, 1331 int didx) 1332 { 1333 int rc = 0; 1334 cpumask_t cpumask; 1335 1336 NAPI_DEBUG("-->%s(napi_cd=%d, didx=%d)", __func__, napi_ce, didx); 1337 1338 cpumask.bits[0] = (1 << didx); 1339 1340 irq_modify_status(napid->napis[napi_ce].irq, IRQ_NO_BALANCING, 0); 1341 rc = irq_set_affinity_hint(napid->napis[napi_ce].irq, &cpumask); 1342 1343 /* unmark the napis bitmap in the cpu table */ 1344 napid->napi_cpu[napid->napis[napi_ce].cpu].napis &= ~(0x01 << napi_ce); 1345 /* mark the napis bitmap for the new designated cpu */ 1346 napid->napi_cpu[didx].napis |= (0x01 << napi_ce); 1347 napid->napis[napi_ce].cpu = didx; 1348 1349 NAPI_DEBUG("<--%s[%d]", __func__, rc); 1350 return rc; 1351 } 1352 /** 1353 * hncm_dest_cpu() - finds a destination CPU for NAPI 1354 * @napid: pointer to NAPI block 1355 * @act : RELOCATE | COLLAPSE | DISPERSE 1356 * 1357 * Finds the designated destionation for the next IRQ. 1358 * RELOCATE: translated to either COLLAPSE or DISPERSE based 1359 * on napid->napi_mode (throughput state) 1360 * COLLAPSE: All have the same destination: the first online CPU in lilcl 1361 * DISPERSE: One of the CPU in bigcl, which has the smallest number of 1362 * NAPIs on it 1363 * 1364 * Return: >=0 : index in the cpu topology table 1365 * : < 0 : error 1366 */ 1367 static int hncm_dest_cpu(struct qca_napi_data *napid, int act) 1368 { 1369 int destidx = -1; 1370 int head, i; 1371 1372 NAPI_DEBUG("-->%s(act=%d)", __func__, act); 1373 if (act == HNC_ACT_RELOCATE) { 1374 if (napid->napi_mode == QCA_NAPI_TPUT_LO) 1375 act = HNC_ACT_COLLAPSE; 1376 else 1377 act = HNC_ACT_DISPERSE; 1378 NAPI_DEBUG("%s: act changed from HNC_ACT_RELOCATE to %d", 1379 __func__, act); 1380 } 1381 if (act == HNC_ACT_COLLAPSE) { 1382 head = i = napid->lilcl_head; 1383 retry_collapse: 1384 while (i >= 0) { 1385 if (napid->napi_cpu[i].state == QCA_NAPI_CPU_UP) { 1386 destidx = i; 1387 break; 1388 } 1389 i = napid->napi_cpu[i].cluster_nxt; 1390 } 1391 if ((destidx < 0) && (head == napid->lilcl_head)) { 1392 NAPI_DEBUG("%s: COLLAPSE: no lilcl dest, try bigcl", 1393 __func__); 1394 head = i = napid->bigcl_head; 1395 goto retry_collapse; 1396 } 1397 } else { /* HNC_ACT_DISPERSE */ 1398 int smallest = 99; /* all 32 bits full */ 1399 int smallidx = -1; 1400 1401 head = i = napid->bigcl_head; 1402 retry_disperse: 1403 while (i >= 0) { 1404 if ((napid->napi_cpu[i].state == QCA_NAPI_CPU_UP) && 1405 (hweight32(napid->napi_cpu[i].napis) <= smallest)) { 1406 smallest = napid->napi_cpu[i].napis; 1407 smallidx = i; 1408 } 1409 i = napid->napi_cpu[i].cluster_nxt; 1410 } 1411 destidx = smallidx; 1412 if ((destidx < 0) && (head == napid->bigcl_head)) { 1413 NAPI_DEBUG("%s: DISPERSE: no bigcl dest, try lilcl", 1414 __func__); 1415 head = i = napid->lilcl_head; 1416 goto retry_disperse; 1417 } 1418 } 1419 NAPI_DEBUG("<--%s[dest=%d]", __func__, destidx); 1420 return destidx; 1421 } 1422 /** 1423 * hif_napi_cpu_migrate() - migrate IRQs away 1424 * @cpu: -1: all CPUs <n> specific CPU 1425 * @act: COLLAPSE | DISPERSE 1426 * 1427 * Moves IRQs/NAPIs from specific or all CPUs (specified by @cpu) to eligible 1428 * cores. Eligible cores are: 1429 * act=COLLAPSE -> the first online core of the little cluster 1430 * act=DISPERSE -> separate cores of the big cluster, so that each core will 1431 * host minimum number of NAPIs/IRQs (napid->cpus[cpu].napis) 1432 * 1433 * Note that this function is called with a spinlock acquired already. 1434 * 1435 * Return: =0: success 1436 * <0: error 1437 */ 1438 1439 int hif_napi_cpu_migrate(struct qca_napi_data *napid, int cpu, int action) 1440 { 1441 int rc = 0; 1442 struct qca_napi_cpu *cpup; 1443 int i, dind; 1444 uint32_t napis; 1445 1446 NAPI_DEBUG("-->%s(.., cpu=%d, act=%d)", 1447 __func__, cpu, action); 1448 /* the following is really: hif_napi_enabled() with less overhead */ 1449 if (napid->ce_map == 0) { 1450 NAPI_DEBUG("%s: NAPI disabled. Not migrating.", __func__); 1451 goto hncm_return; 1452 } 1453 1454 cpup = napid->napi_cpu; 1455 1456 switch (action) { 1457 case HNC_ACT_RELOCATE: 1458 case HNC_ACT_DISPERSE: 1459 case HNC_ACT_COLLAPSE: { 1460 /* first find the src napi set */ 1461 if (cpu == HNC_ANY_CPU) 1462 napis = napid->ce_map; 1463 else 1464 napis = cpup[cpu].napis; 1465 /* then clear the napi bitmap on each CPU */ 1466 for (i = 0; i < NR_CPUS; i++) 1467 cpup[i].napis = 0; 1468 /* then for each of the NAPIs to disperse: */ 1469 for (i = 0; i < CE_COUNT_MAX; i++) 1470 if (napis & (1 << i)) { 1471 /* find a destination CPU */ 1472 dind = hncm_dest_cpu(napid, action); 1473 if (dind >= 0) { 1474 NAPI_DEBUG("Migrating NAPI ce%d to %d", 1475 i, dind); 1476 rc = hncm_migrate_to(napid, i, dind); 1477 } else { 1478 NAPI_DEBUG("No dest for NAPI ce%d", i); 1479 hnc_dump_cpus(napid); 1480 rc = -1; 1481 } 1482 } 1483 break; 1484 } 1485 default: { 1486 NAPI_DEBUG("%s: bad action: %d\n", __func__, action); 1487 QDF_BUG(0); 1488 break; 1489 } 1490 } /* switch action */ 1491 1492 hncm_return: 1493 hnc_dump_cpus(napid); 1494 return rc; 1495 } 1496 1497 1498 /** 1499 * hif_napi_bl_irq() - calls irq_modify_status to enable/disable blacklisting 1500 * @napid: pointer to qca_napi_data structure 1501 * @bl_flag: blacklist flag to enable/disable blacklisting 1502 * 1503 * The function enables/disables blacklisting for all the copy engine 1504 * interrupts on which NAPI is enabled. 1505 * 1506 * Return: None 1507 */ 1508 static inline void hif_napi_bl_irq(struct qca_napi_data *napid, bool bl_flag) 1509 { 1510 int i; 1511 1512 for (i = 0; i < CE_COUNT_MAX; i++) { 1513 /* check if NAPI is enabled on the CE */ 1514 if (!(napid->ce_map & (0x01 << i))) 1515 continue; 1516 1517 if (bl_flag == true) 1518 irq_modify_status(napid->napis[i].irq, 1519 0, IRQ_NO_BALANCING); 1520 else 1521 irq_modify_status(napid->napis[i].irq, 1522 IRQ_NO_BALANCING, 0); 1523 HIF_DBG("%s: bl_flag %d CE %d", __func__, bl_flag, i); 1524 } 1525 } 1526 1527 #ifdef CONFIG_SCHED_CORE_CTL 1528 /* Enable this API only if kernel feature - CONFIG_SCHED_CORE_CTL is defined */ 1529 static inline int hif_napi_core_ctl_set_boost(bool boost) 1530 { 1531 return core_ctl_set_boost(boost); 1532 } 1533 #else 1534 static inline int hif_napi_core_ctl_set_boost(bool boost) 1535 { 1536 return 0; 1537 } 1538 #endif 1539 /** 1540 * hif_napi_cpu_blacklist() - en(dis)ables blacklisting for NAPI RX interrupts. 1541 * @napid: pointer to qca_napi_data structure 1542 * @op: blacklist operation to perform 1543 * 1544 * The function enables/disables/queries blacklisting for all CE RX 1545 * interrupts with NAPI enabled. Besides blacklisting, it also enables/disables 1546 * core_ctl_set_boost. 1547 * Once blacklisting is enabled, the interrupts will not be managed by the IRQ 1548 * balancer. 1549 * 1550 * Return: -EINVAL, in case IRQ_BLACKLISTING and CORE_CTL_BOOST is not enabled 1551 * for BLACKLIST_QUERY op - blacklist refcount 1552 * for BLACKLIST_ON op - return value from core_ctl_set_boost API 1553 * for BLACKLIST_OFF op - return value from core_ctl_set_boost API 1554 */ 1555 int hif_napi_cpu_blacklist(struct qca_napi_data *napid, 1556 enum qca_blacklist_op op) 1557 { 1558 int rc = 0; 1559 static int ref_count; /* = 0 by the compiler */ 1560 uint8_t flags = napid->flags; 1561 bool bl_en = flags & QCA_NAPI_FEATURE_IRQ_BLACKLISTING; 1562 bool ccb_en = flags & QCA_NAPI_FEATURE_CORE_CTL_BOOST; 1563 1564 NAPI_DEBUG("-->%s(%d %d)", __func__, flags, op); 1565 1566 if (!(bl_en && ccb_en)) { 1567 rc = -EINVAL; 1568 goto out; 1569 } 1570 1571 switch (op) { 1572 case BLACKLIST_QUERY: 1573 rc = ref_count; 1574 break; 1575 case BLACKLIST_ON: 1576 ref_count++; 1577 rc = 0; 1578 if (ref_count == 1) { 1579 rc = hif_napi_core_ctl_set_boost(true); 1580 NAPI_DEBUG("boost_on() returns %d - refcnt=%d", 1581 rc, ref_count); 1582 hif_napi_bl_irq(napid, true); 1583 } 1584 break; 1585 case BLACKLIST_OFF: 1586 if (ref_count) 1587 ref_count--; 1588 rc = 0; 1589 if (ref_count == 0) { 1590 rc = hif_napi_core_ctl_set_boost(false); 1591 NAPI_DEBUG("boost_off() returns %d - refcnt=%d", 1592 rc, ref_count); 1593 hif_napi_bl_irq(napid, false); 1594 } 1595 break; 1596 default: 1597 NAPI_DEBUG("Invalid blacklist op: %d", op); 1598 rc = -EINVAL; 1599 } /* switch */ 1600 out: 1601 NAPI_DEBUG("<--%s[%d]", __func__, rc); 1602 return rc; 1603 } 1604 1605 /** 1606 * hif_napi_serialize() - [de-]serialize NAPI operations 1607 * @hif: context 1608 * @is_on: 1: serialize, 0: deserialize 1609 * 1610 * hif_napi_serialize(hif, 1) can be called multiple times. It will perform the 1611 * following steps (see hif_napi_event for code): 1612 * - put irqs of all NAPI instances on the same CPU 1613 * - only for the first serialize call: blacklist 1614 * 1615 * hif_napi_serialize(hif, 0): 1616 * - start a timer (multiple of BusBandwidthTimer -- default: 100 msec) 1617 * - at the end of the timer, check the current throughput state and 1618 * implement it. 1619 */ 1620 static unsigned long napi_serialize_reqs; 1621 int hif_napi_serialize(struct hif_opaque_softc *hif, int is_on) 1622 { 1623 int rc = -EINVAL; 1624 1625 if (hif != NULL) 1626 switch (is_on) { 1627 case 0: { /* de-serialize */ 1628 rc = hif_napi_event(hif, NAPI_EVT_USR_NORMAL, 1629 (void *) 0); 1630 napi_serialize_reqs = 0; 1631 break; 1632 } /* end de-serialize */ 1633 case 1: { /* serialize */ 1634 rc = hif_napi_event(hif, NAPI_EVT_USR_SERIAL, 1635 (void *)napi_serialize_reqs++); 1636 break; 1637 } /* end serialize */ 1638 default: 1639 break; /* no-op */ 1640 } /* switch */ 1641 return rc; 1642 } 1643 1644 #endif /* ifdef HELIUMPLUS */ 1645