1 /* 2 * Copyright(c) 2015 - 2018 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 48 #include <linux/spinlock.h> 49 #include <linux/seqlock.h> 50 #include <linux/netdevice.h> 51 #include <linux/moduleparam.h> 52 #include <linux/bitops.h> 53 #include <linux/timer.h> 54 #include <linux/vmalloc.h> 55 #include <linux/highmem.h> 56 57 #include "hfi.h" 58 #include "common.h" 59 #include "qp.h" 60 #include "sdma.h" 61 #include "iowait.h" 62 #include "trace.h" 63 64 /* must be a power of 2 >= 64 <= 32768 */ 65 #define SDMA_DESCQ_CNT 2048 66 #define SDMA_DESC_INTR 64 67 #define INVALID_TAIL 0xffff 68 #define SDMA_PAD max_t(size_t, MAX_16B_PADDING, sizeof(u32)) 69 70 static uint sdma_descq_cnt = SDMA_DESCQ_CNT; 71 module_param(sdma_descq_cnt, uint, S_IRUGO); 72 MODULE_PARM_DESC(sdma_descq_cnt, "Number of SDMA descq entries"); 73 74 static uint sdma_idle_cnt = 250; 75 module_param(sdma_idle_cnt, uint, S_IRUGO); 76 MODULE_PARM_DESC(sdma_idle_cnt, "sdma interrupt idle delay (ns,default 250)"); 77 78 uint mod_num_sdma; 79 module_param_named(num_sdma, mod_num_sdma, uint, S_IRUGO); 80 MODULE_PARM_DESC(num_sdma, "Set max number SDMA engines to use"); 81 82 static uint sdma_desct_intr = SDMA_DESC_INTR; 83 module_param_named(desct_intr, sdma_desct_intr, uint, S_IRUGO | S_IWUSR); 84 MODULE_PARM_DESC(desct_intr, "Number of SDMA descriptor before interrupt"); 85 86 #define SDMA_WAIT_BATCH_SIZE 20 87 /* max wait time for a SDMA engine to indicate it has halted */ 88 #define SDMA_ERR_HALT_TIMEOUT 10 /* ms */ 89 /* all SDMA engine errors that cause a halt */ 90 91 #define SD(name) SEND_DMA_##name 92 #define ALL_SDMA_ENG_HALT_ERRS \ 93 (SD(ENG_ERR_STATUS_SDMA_WRONG_DW_ERR_SMASK) \ 94 | SD(ENG_ERR_STATUS_SDMA_GEN_MISMATCH_ERR_SMASK) \ 95 | SD(ENG_ERR_STATUS_SDMA_TOO_LONG_ERR_SMASK) \ 96 | SD(ENG_ERR_STATUS_SDMA_TAIL_OUT_OF_BOUNDS_ERR_SMASK) \ 97 | SD(ENG_ERR_STATUS_SDMA_FIRST_DESC_ERR_SMASK) \ 98 | SD(ENG_ERR_STATUS_SDMA_MEM_READ_ERR_SMASK) \ 99 | SD(ENG_ERR_STATUS_SDMA_HALT_ERR_SMASK) \ 100 | SD(ENG_ERR_STATUS_SDMA_LENGTH_MISMATCH_ERR_SMASK) \ 101 | SD(ENG_ERR_STATUS_SDMA_PACKET_DESC_OVERFLOW_ERR_SMASK) \ 102 | SD(ENG_ERR_STATUS_SDMA_HEADER_SELECT_ERR_SMASK) \ 103 | SD(ENG_ERR_STATUS_SDMA_HEADER_ADDRESS_ERR_SMASK) \ 104 | SD(ENG_ERR_STATUS_SDMA_HEADER_LENGTH_ERR_SMASK) \ 105 | SD(ENG_ERR_STATUS_SDMA_TIMEOUT_ERR_SMASK) \ 106 | SD(ENG_ERR_STATUS_SDMA_DESC_TABLE_UNC_ERR_SMASK) \ 107 | SD(ENG_ERR_STATUS_SDMA_ASSEMBLY_UNC_ERR_SMASK) \ 108 | SD(ENG_ERR_STATUS_SDMA_PACKET_TRACKING_UNC_ERR_SMASK) \ 109 | SD(ENG_ERR_STATUS_SDMA_HEADER_STORAGE_UNC_ERR_SMASK) \ 110 | SD(ENG_ERR_STATUS_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_SMASK)) 111 112 /* sdma_sendctrl operations */ 113 #define SDMA_SENDCTRL_OP_ENABLE BIT(0) 114 #define SDMA_SENDCTRL_OP_INTENABLE BIT(1) 115 #define SDMA_SENDCTRL_OP_HALT BIT(2) 116 #define SDMA_SENDCTRL_OP_CLEANUP BIT(3) 117 118 /* handle long defines */ 119 #define SDMA_EGRESS_PACKET_OCCUPANCY_SMASK \ 120 SEND_EGRESS_SEND_DMA_STATUS_SDMA_EGRESS_PACKET_OCCUPANCY_SMASK 121 #define SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT \ 122 SEND_EGRESS_SEND_DMA_STATUS_SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT 123 124 static const char * const sdma_state_names[] = { 125 [sdma_state_s00_hw_down] = "s00_HwDown", 126 [sdma_state_s10_hw_start_up_halt_wait] = "s10_HwStartUpHaltWait", 127 [sdma_state_s15_hw_start_up_clean_wait] = "s15_HwStartUpCleanWait", 128 [sdma_state_s20_idle] = "s20_Idle", 129 [sdma_state_s30_sw_clean_up_wait] = "s30_SwCleanUpWait", 130 [sdma_state_s40_hw_clean_up_wait] = "s40_HwCleanUpWait", 131 [sdma_state_s50_hw_halt_wait] = "s50_HwHaltWait", 132 [sdma_state_s60_idle_halt_wait] = "s60_IdleHaltWait", 133 [sdma_state_s80_hw_freeze] = "s80_HwFreeze", 134 [sdma_state_s82_freeze_sw_clean] = "s82_FreezeSwClean", 135 [sdma_state_s99_running] = "s99_Running", 136 }; 137 138 #ifdef CONFIG_SDMA_VERBOSITY 139 static const char * const sdma_event_names[] = { 140 [sdma_event_e00_go_hw_down] = "e00_GoHwDown", 141 [sdma_event_e10_go_hw_start] = "e10_GoHwStart", 142 [sdma_event_e15_hw_halt_done] = "e15_HwHaltDone", 143 [sdma_event_e25_hw_clean_up_done] = "e25_HwCleanUpDone", 144 [sdma_event_e30_go_running] = "e30_GoRunning", 145 [sdma_event_e40_sw_cleaned] = "e40_SwCleaned", 146 [sdma_event_e50_hw_cleaned] = "e50_HwCleaned", 147 [sdma_event_e60_hw_halted] = "e60_HwHalted", 148 [sdma_event_e70_go_idle] = "e70_GoIdle", 149 [sdma_event_e80_hw_freeze] = "e80_HwFreeze", 150 [sdma_event_e81_hw_frozen] = "e81_HwFrozen", 151 [sdma_event_e82_hw_unfreeze] = "e82_HwUnfreeze", 152 [sdma_event_e85_link_down] = "e85_LinkDown", 153 [sdma_event_e90_sw_halted] = "e90_SwHalted", 154 }; 155 #endif 156 157 static const struct sdma_set_state_action sdma_action_table[] = { 158 [sdma_state_s00_hw_down] = { 159 .go_s99_running_tofalse = 1, 160 .op_enable = 0, 161 .op_intenable = 0, 162 .op_halt = 0, 163 .op_cleanup = 0, 164 }, 165 [sdma_state_s10_hw_start_up_halt_wait] = { 166 .op_enable = 0, 167 .op_intenable = 0, 168 .op_halt = 1, 169 .op_cleanup = 0, 170 }, 171 [sdma_state_s15_hw_start_up_clean_wait] = { 172 .op_enable = 0, 173 .op_intenable = 1, 174 .op_halt = 0, 175 .op_cleanup = 1, 176 }, 177 [sdma_state_s20_idle] = { 178 .op_enable = 0, 179 .op_intenable = 1, 180 .op_halt = 0, 181 .op_cleanup = 0, 182 }, 183 [sdma_state_s30_sw_clean_up_wait] = { 184 .op_enable = 0, 185 .op_intenable = 0, 186 .op_halt = 0, 187 .op_cleanup = 0, 188 }, 189 [sdma_state_s40_hw_clean_up_wait] = { 190 .op_enable = 0, 191 .op_intenable = 0, 192 .op_halt = 0, 193 .op_cleanup = 1, 194 }, 195 [sdma_state_s50_hw_halt_wait] = { 196 .op_enable = 0, 197 .op_intenable = 0, 198 .op_halt = 0, 199 .op_cleanup = 0, 200 }, 201 [sdma_state_s60_idle_halt_wait] = { 202 .go_s99_running_tofalse = 1, 203 .op_enable = 0, 204 .op_intenable = 0, 205 .op_halt = 1, 206 .op_cleanup = 0, 207 }, 208 [sdma_state_s80_hw_freeze] = { 209 .op_enable = 0, 210 .op_intenable = 0, 211 .op_halt = 0, 212 .op_cleanup = 0, 213 }, 214 [sdma_state_s82_freeze_sw_clean] = { 215 .op_enable = 0, 216 .op_intenable = 0, 217 .op_halt = 0, 218 .op_cleanup = 0, 219 }, 220 [sdma_state_s99_running] = { 221 .op_enable = 1, 222 .op_intenable = 1, 223 .op_halt = 0, 224 .op_cleanup = 0, 225 .go_s99_running_totrue = 1, 226 }, 227 }; 228 229 #define SDMA_TAIL_UPDATE_THRESH 0x1F 230 231 /* declare all statics here rather than keep sorting */ 232 static void sdma_complete(struct kref *); 233 static void sdma_finalput(struct sdma_state *); 234 static void sdma_get(struct sdma_state *); 235 static void sdma_hw_clean_up_task(unsigned long); 236 static void sdma_put(struct sdma_state *); 237 static void sdma_set_state(struct sdma_engine *, enum sdma_states); 238 static void sdma_start_hw_clean_up(struct sdma_engine *); 239 static void sdma_sw_clean_up_task(unsigned long); 240 static void sdma_sendctrl(struct sdma_engine *, unsigned); 241 static void init_sdma_regs(struct sdma_engine *, u32, uint); 242 static void sdma_process_event( 243 struct sdma_engine *sde, 244 enum sdma_events event); 245 static void __sdma_process_event( 246 struct sdma_engine *sde, 247 enum sdma_events event); 248 static void dump_sdma_state(struct sdma_engine *sde); 249 static void sdma_make_progress(struct sdma_engine *sde, u64 status); 250 static void sdma_desc_avail(struct sdma_engine *sde, uint avail); 251 static void sdma_flush_descq(struct sdma_engine *sde); 252 253 /** 254 * sdma_state_name() - return state string from enum 255 * @state: state 256 */ 257 static const char *sdma_state_name(enum sdma_states state) 258 { 259 return sdma_state_names[state]; 260 } 261 262 static void sdma_get(struct sdma_state *ss) 263 { 264 kref_get(&ss->kref); 265 } 266 267 static void sdma_complete(struct kref *kref) 268 { 269 struct sdma_state *ss = 270 container_of(kref, struct sdma_state, kref); 271 272 complete(&ss->comp); 273 } 274 275 static void sdma_put(struct sdma_state *ss) 276 { 277 kref_put(&ss->kref, sdma_complete); 278 } 279 280 static void sdma_finalput(struct sdma_state *ss) 281 { 282 sdma_put(ss); 283 wait_for_completion(&ss->comp); 284 } 285 286 static inline void write_sde_csr( 287 struct sdma_engine *sde, 288 u32 offset0, 289 u64 value) 290 { 291 write_kctxt_csr(sde->dd, sde->this_idx, offset0, value); 292 } 293 294 static inline u64 read_sde_csr( 295 struct sdma_engine *sde, 296 u32 offset0) 297 { 298 return read_kctxt_csr(sde->dd, sde->this_idx, offset0); 299 } 300 301 /* 302 * sdma_wait_for_packet_egress() - wait for the VL FIFO occupancy for 303 * sdma engine 'sde' to drop to 0. 304 */ 305 static void sdma_wait_for_packet_egress(struct sdma_engine *sde, 306 int pause) 307 { 308 u64 off = 8 * sde->this_idx; 309 struct hfi1_devdata *dd = sde->dd; 310 int lcnt = 0; 311 u64 reg_prev; 312 u64 reg = 0; 313 314 while (1) { 315 reg_prev = reg; 316 reg = read_csr(dd, off + SEND_EGRESS_SEND_DMA_STATUS); 317 318 reg &= SDMA_EGRESS_PACKET_OCCUPANCY_SMASK; 319 reg >>= SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT; 320 if (reg == 0) 321 break; 322 /* counter is reest if accupancy count changes */ 323 if (reg != reg_prev) 324 lcnt = 0; 325 if (lcnt++ > 500) { 326 /* timed out - bounce the link */ 327 dd_dev_err(dd, "%s: engine %u timeout waiting for packets to egress, remaining count %u, bouncing link\n", 328 __func__, sde->this_idx, (u32)reg); 329 queue_work(dd->pport->link_wq, 330 &dd->pport->link_bounce_work); 331 break; 332 } 333 udelay(1); 334 } 335 } 336 337 /* 338 * sdma_wait() - wait for packet egress to complete for all SDMA engines, 339 * and pause for credit return. 340 */ 341 void sdma_wait(struct hfi1_devdata *dd) 342 { 343 int i; 344 345 for (i = 0; i < dd->num_sdma; i++) { 346 struct sdma_engine *sde = &dd->per_sdma[i]; 347 348 sdma_wait_for_packet_egress(sde, 0); 349 } 350 } 351 352 static inline void sdma_set_desc_cnt(struct sdma_engine *sde, unsigned cnt) 353 { 354 u64 reg; 355 356 if (!(sde->dd->flags & HFI1_HAS_SDMA_TIMEOUT)) 357 return; 358 reg = cnt; 359 reg &= SD(DESC_CNT_CNT_MASK); 360 reg <<= SD(DESC_CNT_CNT_SHIFT); 361 write_sde_csr(sde, SD(DESC_CNT), reg); 362 } 363 364 static inline void complete_tx(struct sdma_engine *sde, 365 struct sdma_txreq *tx, 366 int res) 367 { 368 /* protect against complete modifying */ 369 struct iowait *wait = tx->wait; 370 callback_t complete = tx->complete; 371 372 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER 373 trace_hfi1_sdma_out_sn(sde, tx->sn); 374 if (WARN_ON_ONCE(sde->head_sn != tx->sn)) 375 dd_dev_err(sde->dd, "expected %llu got %llu\n", 376 sde->head_sn, tx->sn); 377 sde->head_sn++; 378 #endif 379 __sdma_txclean(sde->dd, tx); 380 if (complete) 381 (*complete)(tx, res); 382 if (iowait_sdma_dec(wait)) 383 iowait_drain_wakeup(wait); 384 } 385 386 /* 387 * Complete all the sdma requests with a SDMA_TXREQ_S_ABORTED status 388 * 389 * Depending on timing there can be txreqs in two places: 390 * - in the descq ring 391 * - in the flush list 392 * 393 * To avoid ordering issues the descq ring needs to be flushed 394 * first followed by the flush list. 395 * 396 * This routine is called from two places 397 * - From a work queue item 398 * - Directly from the state machine just before setting the 399 * state to running 400 * 401 * Must be called with head_lock held 402 * 403 */ 404 static void sdma_flush(struct sdma_engine *sde) 405 { 406 struct sdma_txreq *txp, *txp_next; 407 LIST_HEAD(flushlist); 408 unsigned long flags; 409 uint seq; 410 411 /* flush from head to tail */ 412 sdma_flush_descq(sde); 413 spin_lock_irqsave(&sde->flushlist_lock, flags); 414 /* copy flush list */ 415 list_splice_init(&sde->flushlist, &flushlist); 416 spin_unlock_irqrestore(&sde->flushlist_lock, flags); 417 /* flush from flush list */ 418 list_for_each_entry_safe(txp, txp_next, &flushlist, list) 419 complete_tx(sde, txp, SDMA_TXREQ_S_ABORTED); 420 /* wakeup QPs orphaned on the dmawait list */ 421 do { 422 struct iowait *w, *nw; 423 424 seq = read_seqbegin(&sde->waitlock); 425 if (!list_empty(&sde->dmawait)) { 426 write_seqlock(&sde->waitlock); 427 list_for_each_entry_safe(w, nw, &sde->dmawait, list) { 428 if (w->wakeup) { 429 w->wakeup(w, SDMA_AVAIL_REASON); 430 list_del_init(&w->list); 431 } 432 } 433 write_sequnlock(&sde->waitlock); 434 } 435 } while (read_seqretry(&sde->waitlock, seq)); 436 } 437 438 /* 439 * Fields a work request for flushing the descq ring 440 * and the flush list 441 * 442 * If the engine has been brought to running during 443 * the scheduling delay, the flush is ignored, assuming 444 * that the process of bringing the engine to running 445 * would have done this flush prior to going to running. 446 * 447 */ 448 static void sdma_field_flush(struct work_struct *work) 449 { 450 unsigned long flags; 451 struct sdma_engine *sde = 452 container_of(work, struct sdma_engine, flush_worker); 453 454 write_seqlock_irqsave(&sde->head_lock, flags); 455 if (!__sdma_running(sde)) 456 sdma_flush(sde); 457 write_sequnlock_irqrestore(&sde->head_lock, flags); 458 } 459 460 static void sdma_err_halt_wait(struct work_struct *work) 461 { 462 struct sdma_engine *sde = container_of(work, struct sdma_engine, 463 err_halt_worker); 464 u64 statuscsr; 465 unsigned long timeout; 466 467 timeout = jiffies + msecs_to_jiffies(SDMA_ERR_HALT_TIMEOUT); 468 while (1) { 469 statuscsr = read_sde_csr(sde, SD(STATUS)); 470 statuscsr &= SD(STATUS_ENG_HALTED_SMASK); 471 if (statuscsr) 472 break; 473 if (time_after(jiffies, timeout)) { 474 dd_dev_err(sde->dd, 475 "SDMA engine %d - timeout waiting for engine to halt\n", 476 sde->this_idx); 477 /* 478 * Continue anyway. This could happen if there was 479 * an uncorrectable error in the wrong spot. 480 */ 481 break; 482 } 483 usleep_range(80, 120); 484 } 485 486 sdma_process_event(sde, sdma_event_e15_hw_halt_done); 487 } 488 489 static void sdma_err_progress_check_schedule(struct sdma_engine *sde) 490 { 491 if (!is_bx(sde->dd) && HFI1_CAP_IS_KSET(SDMA_AHG)) { 492 unsigned index; 493 struct hfi1_devdata *dd = sde->dd; 494 495 for (index = 0; index < dd->num_sdma; index++) { 496 struct sdma_engine *curr_sdma = &dd->per_sdma[index]; 497 498 if (curr_sdma != sde) 499 curr_sdma->progress_check_head = 500 curr_sdma->descq_head; 501 } 502 dd_dev_err(sde->dd, 503 "SDMA engine %d - check scheduled\n", 504 sde->this_idx); 505 mod_timer(&sde->err_progress_check_timer, jiffies + 10); 506 } 507 } 508 509 static void sdma_err_progress_check(struct timer_list *t) 510 { 511 unsigned index; 512 struct sdma_engine *sde = from_timer(sde, t, err_progress_check_timer); 513 514 dd_dev_err(sde->dd, "SDE progress check event\n"); 515 for (index = 0; index < sde->dd->num_sdma; index++) { 516 struct sdma_engine *curr_sde = &sde->dd->per_sdma[index]; 517 unsigned long flags; 518 519 /* check progress on each engine except the current one */ 520 if (curr_sde == sde) 521 continue; 522 /* 523 * We must lock interrupts when acquiring sde->lock, 524 * to avoid a deadlock if interrupt triggers and spins on 525 * the same lock on same CPU 526 */ 527 spin_lock_irqsave(&curr_sde->tail_lock, flags); 528 write_seqlock(&curr_sde->head_lock); 529 530 /* skip non-running queues */ 531 if (curr_sde->state.current_state != sdma_state_s99_running) { 532 write_sequnlock(&curr_sde->head_lock); 533 spin_unlock_irqrestore(&curr_sde->tail_lock, flags); 534 continue; 535 } 536 537 if ((curr_sde->descq_head != curr_sde->descq_tail) && 538 (curr_sde->descq_head == 539 curr_sde->progress_check_head)) 540 __sdma_process_event(curr_sde, 541 sdma_event_e90_sw_halted); 542 write_sequnlock(&curr_sde->head_lock); 543 spin_unlock_irqrestore(&curr_sde->tail_lock, flags); 544 } 545 schedule_work(&sde->err_halt_worker); 546 } 547 548 static void sdma_hw_clean_up_task(unsigned long opaque) 549 { 550 struct sdma_engine *sde = (struct sdma_engine *)opaque; 551 u64 statuscsr; 552 553 while (1) { 554 #ifdef CONFIG_SDMA_VERBOSITY 555 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n", 556 sde->this_idx, slashstrip(__FILE__), __LINE__, 557 __func__); 558 #endif 559 statuscsr = read_sde_csr(sde, SD(STATUS)); 560 statuscsr &= SD(STATUS_ENG_CLEANED_UP_SMASK); 561 if (statuscsr) 562 break; 563 udelay(10); 564 } 565 566 sdma_process_event(sde, sdma_event_e25_hw_clean_up_done); 567 } 568 569 static inline struct sdma_txreq *get_txhead(struct sdma_engine *sde) 570 { 571 return sde->tx_ring[sde->tx_head & sde->sdma_mask]; 572 } 573 574 /* 575 * flush ring for recovery 576 */ 577 static void sdma_flush_descq(struct sdma_engine *sde) 578 { 579 u16 head, tail; 580 int progress = 0; 581 struct sdma_txreq *txp = get_txhead(sde); 582 583 /* The reason for some of the complexity of this code is that 584 * not all descriptors have corresponding txps. So, we have to 585 * be able to skip over descs until we wander into the range of 586 * the next txp on the list. 587 */ 588 head = sde->descq_head & sde->sdma_mask; 589 tail = sde->descq_tail & sde->sdma_mask; 590 while (head != tail) { 591 /* advance head, wrap if needed */ 592 head = ++sde->descq_head & sde->sdma_mask; 593 /* if now past this txp's descs, do the callback */ 594 if (txp && txp->next_descq_idx == head) { 595 /* remove from list */ 596 sde->tx_ring[sde->tx_head++ & sde->sdma_mask] = NULL; 597 complete_tx(sde, txp, SDMA_TXREQ_S_ABORTED); 598 trace_hfi1_sdma_progress(sde, head, tail, txp); 599 txp = get_txhead(sde); 600 } 601 progress++; 602 } 603 if (progress) 604 sdma_desc_avail(sde, sdma_descq_freecnt(sde)); 605 } 606 607 static void sdma_sw_clean_up_task(unsigned long opaque) 608 { 609 struct sdma_engine *sde = (struct sdma_engine *)opaque; 610 unsigned long flags; 611 612 spin_lock_irqsave(&sde->tail_lock, flags); 613 write_seqlock(&sde->head_lock); 614 615 /* 616 * At this point, the following should always be true: 617 * - We are halted, so no more descriptors are getting retired. 618 * - We are not running, so no one is submitting new work. 619 * - Only we can send the e40_sw_cleaned, so we can't start 620 * running again until we say so. So, the active list and 621 * descq are ours to play with. 622 */ 623 624 /* 625 * In the error clean up sequence, software clean must be called 626 * before the hardware clean so we can use the hardware head in 627 * the progress routine. A hardware clean or SPC unfreeze will 628 * reset the hardware head. 629 * 630 * Process all retired requests. The progress routine will use the 631 * latest physical hardware head - we are not running so speed does 632 * not matter. 633 */ 634 sdma_make_progress(sde, 0); 635 636 sdma_flush(sde); 637 638 /* 639 * Reset our notion of head and tail. 640 * Note that the HW registers have been reset via an earlier 641 * clean up. 642 */ 643 sde->descq_tail = 0; 644 sde->descq_head = 0; 645 sde->desc_avail = sdma_descq_freecnt(sde); 646 *sde->head_dma = 0; 647 648 __sdma_process_event(sde, sdma_event_e40_sw_cleaned); 649 650 write_sequnlock(&sde->head_lock); 651 spin_unlock_irqrestore(&sde->tail_lock, flags); 652 } 653 654 static void sdma_sw_tear_down(struct sdma_engine *sde) 655 { 656 struct sdma_state *ss = &sde->state; 657 658 /* Releasing this reference means the state machine has stopped. */ 659 sdma_put(ss); 660 661 /* stop waiting for all unfreeze events to complete */ 662 atomic_set(&sde->dd->sdma_unfreeze_count, -1); 663 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq); 664 } 665 666 static void sdma_start_hw_clean_up(struct sdma_engine *sde) 667 { 668 tasklet_hi_schedule(&sde->sdma_hw_clean_up_task); 669 } 670 671 static void sdma_set_state(struct sdma_engine *sde, 672 enum sdma_states next_state) 673 { 674 struct sdma_state *ss = &sde->state; 675 const struct sdma_set_state_action *action = sdma_action_table; 676 unsigned op = 0; 677 678 trace_hfi1_sdma_state( 679 sde, 680 sdma_state_names[ss->current_state], 681 sdma_state_names[next_state]); 682 683 /* debugging bookkeeping */ 684 ss->previous_state = ss->current_state; 685 ss->previous_op = ss->current_op; 686 ss->current_state = next_state; 687 688 if (ss->previous_state != sdma_state_s99_running && 689 next_state == sdma_state_s99_running) 690 sdma_flush(sde); 691 692 if (action[next_state].op_enable) 693 op |= SDMA_SENDCTRL_OP_ENABLE; 694 695 if (action[next_state].op_intenable) 696 op |= SDMA_SENDCTRL_OP_INTENABLE; 697 698 if (action[next_state].op_halt) 699 op |= SDMA_SENDCTRL_OP_HALT; 700 701 if (action[next_state].op_cleanup) 702 op |= SDMA_SENDCTRL_OP_CLEANUP; 703 704 if (action[next_state].go_s99_running_tofalse) 705 ss->go_s99_running = 0; 706 707 if (action[next_state].go_s99_running_totrue) 708 ss->go_s99_running = 1; 709 710 ss->current_op = op; 711 sdma_sendctrl(sde, ss->current_op); 712 } 713 714 /** 715 * sdma_get_descq_cnt() - called when device probed 716 * 717 * Return a validated descq count. 718 * 719 * This is currently only used in the verbs initialization to build the tx 720 * list. 721 * 722 * This will probably be deleted in favor of a more scalable approach to 723 * alloc tx's. 724 * 725 */ 726 u16 sdma_get_descq_cnt(void) 727 { 728 u16 count = sdma_descq_cnt; 729 730 if (!count) 731 return SDMA_DESCQ_CNT; 732 /* count must be a power of 2 greater than 64 and less than 733 * 32768. Otherwise return default. 734 */ 735 if (!is_power_of_2(count)) 736 return SDMA_DESCQ_CNT; 737 if (count < 64 || count > 32768) 738 return SDMA_DESCQ_CNT; 739 return count; 740 } 741 742 /** 743 * sdma_engine_get_vl() - return vl for a given sdma engine 744 * @sde: sdma engine 745 * 746 * This function returns the vl mapped to a given engine, or an error if 747 * the mapping can't be found. The mapping fields are protected by RCU. 748 */ 749 int sdma_engine_get_vl(struct sdma_engine *sde) 750 { 751 struct hfi1_devdata *dd = sde->dd; 752 struct sdma_vl_map *m; 753 u8 vl; 754 755 if (sde->this_idx >= TXE_NUM_SDMA_ENGINES) 756 return -EINVAL; 757 758 rcu_read_lock(); 759 m = rcu_dereference(dd->sdma_map); 760 if (unlikely(!m)) { 761 rcu_read_unlock(); 762 return -EINVAL; 763 } 764 vl = m->engine_to_vl[sde->this_idx]; 765 rcu_read_unlock(); 766 767 return vl; 768 } 769 770 /** 771 * sdma_select_engine_vl() - select sdma engine 772 * @dd: devdata 773 * @selector: a spreading factor 774 * @vl: this vl 775 * 776 * 777 * This function returns an engine based on the selector and a vl. The 778 * mapping fields are protected by RCU. 779 */ 780 struct sdma_engine *sdma_select_engine_vl( 781 struct hfi1_devdata *dd, 782 u32 selector, 783 u8 vl) 784 { 785 struct sdma_vl_map *m; 786 struct sdma_map_elem *e; 787 struct sdma_engine *rval; 788 789 /* NOTE This should only happen if SC->VL changed after the initial 790 * checks on the QP/AH 791 * Default will return engine 0 below 792 */ 793 if (vl >= num_vls) { 794 rval = NULL; 795 goto done; 796 } 797 798 rcu_read_lock(); 799 m = rcu_dereference(dd->sdma_map); 800 if (unlikely(!m)) { 801 rcu_read_unlock(); 802 return &dd->per_sdma[0]; 803 } 804 e = m->map[vl & m->mask]; 805 rval = e->sde[selector & e->mask]; 806 rcu_read_unlock(); 807 808 done: 809 rval = !rval ? &dd->per_sdma[0] : rval; 810 trace_hfi1_sdma_engine_select(dd, selector, vl, rval->this_idx); 811 return rval; 812 } 813 814 /** 815 * sdma_select_engine_sc() - select sdma engine 816 * @dd: devdata 817 * @selector: a spreading factor 818 * @sc5: the 5 bit sc 819 * 820 * 821 * This function returns an engine based on the selector and an sc. 822 */ 823 struct sdma_engine *sdma_select_engine_sc( 824 struct hfi1_devdata *dd, 825 u32 selector, 826 u8 sc5) 827 { 828 u8 vl = sc_to_vlt(dd, sc5); 829 830 return sdma_select_engine_vl(dd, selector, vl); 831 } 832 833 struct sdma_rht_map_elem { 834 u32 mask; 835 u8 ctr; 836 struct sdma_engine *sde[]; 837 }; 838 839 struct sdma_rht_node { 840 unsigned long cpu_id; 841 struct sdma_rht_map_elem *map[HFI1_MAX_VLS_SUPPORTED]; 842 struct rhash_head node; 843 }; 844 845 #define NR_CPUS_HINT 192 846 847 static const struct rhashtable_params sdma_rht_params = { 848 .nelem_hint = NR_CPUS_HINT, 849 .head_offset = offsetof(struct sdma_rht_node, node), 850 .key_offset = offsetof(struct sdma_rht_node, cpu_id), 851 .key_len = sizeof_field(struct sdma_rht_node, cpu_id), 852 .max_size = NR_CPUS, 853 .min_size = 8, 854 .automatic_shrinking = true, 855 }; 856 857 /* 858 * sdma_select_user_engine() - select sdma engine based on user setup 859 * @dd: devdata 860 * @selector: a spreading factor 861 * @vl: this vl 862 * 863 * This function returns an sdma engine for a user sdma request. 864 * User defined sdma engine affinity setting is honored when applicable, 865 * otherwise system default sdma engine mapping is used. To ensure correct 866 * ordering, the mapping from <selector, vl> to sde must remain unchanged. 867 */ 868 struct sdma_engine *sdma_select_user_engine(struct hfi1_devdata *dd, 869 u32 selector, u8 vl) 870 { 871 struct sdma_rht_node *rht_node; 872 struct sdma_engine *sde = NULL; 873 unsigned long cpu_id; 874 875 /* 876 * To ensure that always the same sdma engine(s) will be 877 * selected make sure the process is pinned to this CPU only. 878 */ 879 if (current->nr_cpus_allowed != 1) 880 goto out; 881 882 cpu_id = smp_processor_id(); 883 rcu_read_lock(); 884 rht_node = rhashtable_lookup(dd->sdma_rht, &cpu_id, 885 sdma_rht_params); 886 887 if (rht_node && rht_node->map[vl]) { 888 struct sdma_rht_map_elem *map = rht_node->map[vl]; 889 890 sde = map->sde[selector & map->mask]; 891 } 892 rcu_read_unlock(); 893 894 if (sde) 895 return sde; 896 897 out: 898 return sdma_select_engine_vl(dd, selector, vl); 899 } 900 901 static void sdma_populate_sde_map(struct sdma_rht_map_elem *map) 902 { 903 int i; 904 905 for (i = 0; i < roundup_pow_of_two(map->ctr ? : 1) - map->ctr; i++) 906 map->sde[map->ctr + i] = map->sde[i]; 907 } 908 909 static void sdma_cleanup_sde_map(struct sdma_rht_map_elem *map, 910 struct sdma_engine *sde) 911 { 912 unsigned int i, pow; 913 914 /* only need to check the first ctr entries for a match */ 915 for (i = 0; i < map->ctr; i++) { 916 if (map->sde[i] == sde) { 917 memmove(&map->sde[i], &map->sde[i + 1], 918 (map->ctr - i - 1) * sizeof(map->sde[0])); 919 map->ctr--; 920 pow = roundup_pow_of_two(map->ctr ? : 1); 921 map->mask = pow - 1; 922 sdma_populate_sde_map(map); 923 break; 924 } 925 } 926 } 927 928 /* 929 * Prevents concurrent reads and writes of the sdma engine cpu_mask 930 */ 931 static DEFINE_MUTEX(process_to_sde_mutex); 932 933 ssize_t sdma_set_cpu_to_sde_map(struct sdma_engine *sde, const char *buf, 934 size_t count) 935 { 936 struct hfi1_devdata *dd = sde->dd; 937 cpumask_var_t mask, new_mask; 938 unsigned long cpu; 939 int ret, vl, sz; 940 struct sdma_rht_node *rht_node; 941 942 vl = sdma_engine_get_vl(sde); 943 if (unlikely(vl < 0 || vl >= ARRAY_SIZE(rht_node->map))) 944 return -EINVAL; 945 946 ret = zalloc_cpumask_var(&mask, GFP_KERNEL); 947 if (!ret) 948 return -ENOMEM; 949 950 ret = zalloc_cpumask_var(&new_mask, GFP_KERNEL); 951 if (!ret) { 952 free_cpumask_var(mask); 953 return -ENOMEM; 954 } 955 ret = cpulist_parse(buf, mask); 956 if (ret) 957 goto out_free; 958 959 if (!cpumask_subset(mask, cpu_online_mask)) { 960 dd_dev_warn(sde->dd, "Invalid CPU mask\n"); 961 ret = -EINVAL; 962 goto out_free; 963 } 964 965 sz = sizeof(struct sdma_rht_map_elem) + 966 (TXE_NUM_SDMA_ENGINES * sizeof(struct sdma_engine *)); 967 968 mutex_lock(&process_to_sde_mutex); 969 970 for_each_cpu(cpu, mask) { 971 /* Check if we have this already mapped */ 972 if (cpumask_test_cpu(cpu, &sde->cpu_mask)) { 973 cpumask_set_cpu(cpu, new_mask); 974 continue; 975 } 976 977 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpu, 978 sdma_rht_params); 979 if (!rht_node) { 980 rht_node = kzalloc(sizeof(*rht_node), GFP_KERNEL); 981 if (!rht_node) { 982 ret = -ENOMEM; 983 goto out; 984 } 985 986 rht_node->map[vl] = kzalloc(sz, GFP_KERNEL); 987 if (!rht_node->map[vl]) { 988 kfree(rht_node); 989 ret = -ENOMEM; 990 goto out; 991 } 992 rht_node->cpu_id = cpu; 993 rht_node->map[vl]->mask = 0; 994 rht_node->map[vl]->ctr = 1; 995 rht_node->map[vl]->sde[0] = sde; 996 997 ret = rhashtable_insert_fast(dd->sdma_rht, 998 &rht_node->node, 999 sdma_rht_params); 1000 if (ret) { 1001 kfree(rht_node->map[vl]); 1002 kfree(rht_node); 1003 dd_dev_err(sde->dd, "Failed to set process to sde affinity for cpu %lu\n", 1004 cpu); 1005 goto out; 1006 } 1007 1008 } else { 1009 int ctr, pow; 1010 1011 /* Add new user mappings */ 1012 if (!rht_node->map[vl]) 1013 rht_node->map[vl] = kzalloc(sz, GFP_KERNEL); 1014 1015 if (!rht_node->map[vl]) { 1016 ret = -ENOMEM; 1017 goto out; 1018 } 1019 1020 rht_node->map[vl]->ctr++; 1021 ctr = rht_node->map[vl]->ctr; 1022 rht_node->map[vl]->sde[ctr - 1] = sde; 1023 pow = roundup_pow_of_two(ctr); 1024 rht_node->map[vl]->mask = pow - 1; 1025 1026 /* Populate the sde map table */ 1027 sdma_populate_sde_map(rht_node->map[vl]); 1028 } 1029 cpumask_set_cpu(cpu, new_mask); 1030 } 1031 1032 /* Clean up old mappings */ 1033 for_each_cpu(cpu, cpu_online_mask) { 1034 struct sdma_rht_node *rht_node; 1035 1036 /* Don't cleanup sdes that are set in the new mask */ 1037 if (cpumask_test_cpu(cpu, mask)) 1038 continue; 1039 1040 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpu, 1041 sdma_rht_params); 1042 if (rht_node) { 1043 bool empty = true; 1044 int i; 1045 1046 /* Remove mappings for old sde */ 1047 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) 1048 if (rht_node->map[i]) 1049 sdma_cleanup_sde_map(rht_node->map[i], 1050 sde); 1051 1052 /* Free empty hash table entries */ 1053 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) { 1054 if (!rht_node->map[i]) 1055 continue; 1056 1057 if (rht_node->map[i]->ctr) { 1058 empty = false; 1059 break; 1060 } 1061 } 1062 1063 if (empty) { 1064 ret = rhashtable_remove_fast(dd->sdma_rht, 1065 &rht_node->node, 1066 sdma_rht_params); 1067 WARN_ON(ret); 1068 1069 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) 1070 kfree(rht_node->map[i]); 1071 1072 kfree(rht_node); 1073 } 1074 } 1075 } 1076 1077 cpumask_copy(&sde->cpu_mask, new_mask); 1078 out: 1079 mutex_unlock(&process_to_sde_mutex); 1080 out_free: 1081 free_cpumask_var(mask); 1082 free_cpumask_var(new_mask); 1083 return ret ? : strnlen(buf, PAGE_SIZE); 1084 } 1085 1086 ssize_t sdma_get_cpu_to_sde_map(struct sdma_engine *sde, char *buf) 1087 { 1088 mutex_lock(&process_to_sde_mutex); 1089 if (cpumask_empty(&sde->cpu_mask)) 1090 snprintf(buf, PAGE_SIZE, "%s\n", "empty"); 1091 else 1092 cpumap_print_to_pagebuf(true, buf, &sde->cpu_mask); 1093 mutex_unlock(&process_to_sde_mutex); 1094 return strnlen(buf, PAGE_SIZE); 1095 } 1096 1097 static void sdma_rht_free(void *ptr, void *arg) 1098 { 1099 struct sdma_rht_node *rht_node = ptr; 1100 int i; 1101 1102 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) 1103 kfree(rht_node->map[i]); 1104 1105 kfree(rht_node); 1106 } 1107 1108 /** 1109 * sdma_seqfile_dump_cpu_list() - debugfs dump the cpu to sdma mappings 1110 * @s: seq file 1111 * @dd: hfi1_devdata 1112 * @cpuid: cpu id 1113 * 1114 * This routine dumps the process to sde mappings per cpu 1115 */ 1116 void sdma_seqfile_dump_cpu_list(struct seq_file *s, 1117 struct hfi1_devdata *dd, 1118 unsigned long cpuid) 1119 { 1120 struct sdma_rht_node *rht_node; 1121 int i, j; 1122 1123 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpuid, 1124 sdma_rht_params); 1125 if (!rht_node) 1126 return; 1127 1128 seq_printf(s, "cpu%3lu: ", cpuid); 1129 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) { 1130 if (!rht_node->map[i] || !rht_node->map[i]->ctr) 1131 continue; 1132 1133 seq_printf(s, " vl%d: [", i); 1134 1135 for (j = 0; j < rht_node->map[i]->ctr; j++) { 1136 if (!rht_node->map[i]->sde[j]) 1137 continue; 1138 1139 if (j > 0) 1140 seq_puts(s, ","); 1141 1142 seq_printf(s, " sdma%2d", 1143 rht_node->map[i]->sde[j]->this_idx); 1144 } 1145 seq_puts(s, " ]"); 1146 } 1147 1148 seq_puts(s, "\n"); 1149 } 1150 1151 /* 1152 * Free the indicated map struct 1153 */ 1154 static void sdma_map_free(struct sdma_vl_map *m) 1155 { 1156 int i; 1157 1158 for (i = 0; m && i < m->actual_vls; i++) 1159 kfree(m->map[i]); 1160 kfree(m); 1161 } 1162 1163 /* 1164 * Handle RCU callback 1165 */ 1166 static void sdma_map_rcu_callback(struct rcu_head *list) 1167 { 1168 struct sdma_vl_map *m = container_of(list, struct sdma_vl_map, list); 1169 1170 sdma_map_free(m); 1171 } 1172 1173 /** 1174 * sdma_map_init - called when # vls change 1175 * @dd: hfi1_devdata 1176 * @port: port number 1177 * @num_vls: number of vls 1178 * @vl_engines: per vl engine mapping (optional) 1179 * 1180 * This routine changes the mapping based on the number of vls. 1181 * 1182 * vl_engines is used to specify a non-uniform vl/engine loading. NULL 1183 * implies auto computing the loading and giving each VLs a uniform 1184 * distribution of engines per VL. 1185 * 1186 * The auto algorithm computes the sde_per_vl and the number of extra 1187 * engines. Any extra engines are added from the last VL on down. 1188 * 1189 * rcu locking is used here to control access to the mapping fields. 1190 * 1191 * If either the num_vls or num_sdma are non-power of 2, the array sizes 1192 * in the struct sdma_vl_map and the struct sdma_map_elem are rounded 1193 * up to the next highest power of 2 and the first entry is reused 1194 * in a round robin fashion. 1195 * 1196 * If an error occurs the map change is not done and the mapping is 1197 * not changed. 1198 * 1199 */ 1200 int sdma_map_init(struct hfi1_devdata *dd, u8 port, u8 num_vls, u8 *vl_engines) 1201 { 1202 int i, j; 1203 int extra, sde_per_vl; 1204 int engine = 0; 1205 u8 lvl_engines[OPA_MAX_VLS]; 1206 struct sdma_vl_map *oldmap, *newmap; 1207 1208 if (!(dd->flags & HFI1_HAS_SEND_DMA)) 1209 return 0; 1210 1211 if (!vl_engines) { 1212 /* truncate divide */ 1213 sde_per_vl = dd->num_sdma / num_vls; 1214 /* extras */ 1215 extra = dd->num_sdma % num_vls; 1216 vl_engines = lvl_engines; 1217 /* add extras from last vl down */ 1218 for (i = num_vls - 1; i >= 0; i--, extra--) 1219 vl_engines[i] = sde_per_vl + (extra > 0 ? 1 : 0); 1220 } 1221 /* build new map */ 1222 newmap = kzalloc( 1223 sizeof(struct sdma_vl_map) + 1224 roundup_pow_of_two(num_vls) * 1225 sizeof(struct sdma_map_elem *), 1226 GFP_KERNEL); 1227 if (!newmap) 1228 goto bail; 1229 newmap->actual_vls = num_vls; 1230 newmap->vls = roundup_pow_of_two(num_vls); 1231 newmap->mask = (1 << ilog2(newmap->vls)) - 1; 1232 /* initialize back-map */ 1233 for (i = 0; i < TXE_NUM_SDMA_ENGINES; i++) 1234 newmap->engine_to_vl[i] = -1; 1235 for (i = 0; i < newmap->vls; i++) { 1236 /* save for wrap around */ 1237 int first_engine = engine; 1238 1239 if (i < newmap->actual_vls) { 1240 int sz = roundup_pow_of_two(vl_engines[i]); 1241 1242 /* only allocate once */ 1243 newmap->map[i] = kzalloc( 1244 sizeof(struct sdma_map_elem) + 1245 sz * sizeof(struct sdma_engine *), 1246 GFP_KERNEL); 1247 if (!newmap->map[i]) 1248 goto bail; 1249 newmap->map[i]->mask = (1 << ilog2(sz)) - 1; 1250 /* assign engines */ 1251 for (j = 0; j < sz; j++) { 1252 newmap->map[i]->sde[j] = 1253 &dd->per_sdma[engine]; 1254 if (++engine >= first_engine + vl_engines[i]) 1255 /* wrap back to first engine */ 1256 engine = first_engine; 1257 } 1258 /* assign back-map */ 1259 for (j = 0; j < vl_engines[i]; j++) 1260 newmap->engine_to_vl[first_engine + j] = i; 1261 } else { 1262 /* just re-use entry without allocating */ 1263 newmap->map[i] = newmap->map[i % num_vls]; 1264 } 1265 engine = first_engine + vl_engines[i]; 1266 } 1267 /* newmap in hand, save old map */ 1268 spin_lock_irq(&dd->sde_map_lock); 1269 oldmap = rcu_dereference_protected(dd->sdma_map, 1270 lockdep_is_held(&dd->sde_map_lock)); 1271 1272 /* publish newmap */ 1273 rcu_assign_pointer(dd->sdma_map, newmap); 1274 1275 spin_unlock_irq(&dd->sde_map_lock); 1276 /* success, free any old map after grace period */ 1277 if (oldmap) 1278 call_rcu(&oldmap->list, sdma_map_rcu_callback); 1279 return 0; 1280 bail: 1281 /* free any partial allocation */ 1282 sdma_map_free(newmap); 1283 return -ENOMEM; 1284 } 1285 1286 /** 1287 * sdma_clean() Clean up allocated memory 1288 * @dd: struct hfi1_devdata 1289 * @num_engines: num sdma engines 1290 * 1291 * This routine can be called regardless of the success of 1292 * sdma_init() 1293 */ 1294 void sdma_clean(struct hfi1_devdata *dd, size_t num_engines) 1295 { 1296 size_t i; 1297 struct sdma_engine *sde; 1298 1299 if (dd->sdma_pad_dma) { 1300 dma_free_coherent(&dd->pcidev->dev, SDMA_PAD, 1301 (void *)dd->sdma_pad_dma, 1302 dd->sdma_pad_phys); 1303 dd->sdma_pad_dma = NULL; 1304 dd->sdma_pad_phys = 0; 1305 } 1306 if (dd->sdma_heads_dma) { 1307 dma_free_coherent(&dd->pcidev->dev, dd->sdma_heads_size, 1308 (void *)dd->sdma_heads_dma, 1309 dd->sdma_heads_phys); 1310 dd->sdma_heads_dma = NULL; 1311 dd->sdma_heads_phys = 0; 1312 } 1313 for (i = 0; dd->per_sdma && i < num_engines; ++i) { 1314 sde = &dd->per_sdma[i]; 1315 1316 sde->head_dma = NULL; 1317 sde->head_phys = 0; 1318 1319 if (sde->descq) { 1320 dma_free_coherent( 1321 &dd->pcidev->dev, 1322 sde->descq_cnt * sizeof(u64[2]), 1323 sde->descq, 1324 sde->descq_phys 1325 ); 1326 sde->descq = NULL; 1327 sde->descq_phys = 0; 1328 } 1329 kvfree(sde->tx_ring); 1330 sde->tx_ring = NULL; 1331 } 1332 spin_lock_irq(&dd->sde_map_lock); 1333 sdma_map_free(rcu_access_pointer(dd->sdma_map)); 1334 RCU_INIT_POINTER(dd->sdma_map, NULL); 1335 spin_unlock_irq(&dd->sde_map_lock); 1336 synchronize_rcu(); 1337 kfree(dd->per_sdma); 1338 dd->per_sdma = NULL; 1339 1340 if (dd->sdma_rht) { 1341 rhashtable_free_and_destroy(dd->sdma_rht, sdma_rht_free, NULL); 1342 kfree(dd->sdma_rht); 1343 dd->sdma_rht = NULL; 1344 } 1345 } 1346 1347 /** 1348 * sdma_init() - called when device probed 1349 * @dd: hfi1_devdata 1350 * @port: port number (currently only zero) 1351 * 1352 * Initializes each sde and its csrs. 1353 * Interrupts are not required to be enabled. 1354 * 1355 * Returns: 1356 * 0 - success, -errno on failure 1357 */ 1358 int sdma_init(struct hfi1_devdata *dd, u8 port) 1359 { 1360 unsigned this_idx; 1361 struct sdma_engine *sde; 1362 struct rhashtable *tmp_sdma_rht; 1363 u16 descq_cnt; 1364 void *curr_head; 1365 struct hfi1_pportdata *ppd = dd->pport + port; 1366 u32 per_sdma_credits; 1367 uint idle_cnt = sdma_idle_cnt; 1368 size_t num_engines = chip_sdma_engines(dd); 1369 int ret = -ENOMEM; 1370 1371 if (!HFI1_CAP_IS_KSET(SDMA)) { 1372 HFI1_CAP_CLEAR(SDMA_AHG); 1373 return 0; 1374 } 1375 if (mod_num_sdma && 1376 /* can't exceed chip support */ 1377 mod_num_sdma <= chip_sdma_engines(dd) && 1378 /* count must be >= vls */ 1379 mod_num_sdma >= num_vls) 1380 num_engines = mod_num_sdma; 1381 1382 dd_dev_info(dd, "SDMA mod_num_sdma: %u\n", mod_num_sdma); 1383 dd_dev_info(dd, "SDMA chip_sdma_engines: %u\n", chip_sdma_engines(dd)); 1384 dd_dev_info(dd, "SDMA chip_sdma_mem_size: %u\n", 1385 chip_sdma_mem_size(dd)); 1386 1387 per_sdma_credits = 1388 chip_sdma_mem_size(dd) / (num_engines * SDMA_BLOCK_SIZE); 1389 1390 /* set up freeze waitqueue */ 1391 init_waitqueue_head(&dd->sdma_unfreeze_wq); 1392 atomic_set(&dd->sdma_unfreeze_count, 0); 1393 1394 descq_cnt = sdma_get_descq_cnt(); 1395 dd_dev_info(dd, "SDMA engines %zu descq_cnt %u\n", 1396 num_engines, descq_cnt); 1397 1398 /* alloc memory for array of send engines */ 1399 dd->per_sdma = kcalloc_node(num_engines, sizeof(*dd->per_sdma), 1400 GFP_KERNEL, dd->node); 1401 if (!dd->per_sdma) 1402 return ret; 1403 1404 idle_cnt = ns_to_cclock(dd, idle_cnt); 1405 if (idle_cnt) 1406 dd->default_desc1 = 1407 SDMA_DESC1_HEAD_TO_HOST_FLAG; 1408 else 1409 dd->default_desc1 = 1410 SDMA_DESC1_INT_REQ_FLAG; 1411 1412 if (!sdma_desct_intr) 1413 sdma_desct_intr = SDMA_DESC_INTR; 1414 1415 /* Allocate memory for SendDMA descriptor FIFOs */ 1416 for (this_idx = 0; this_idx < num_engines; ++this_idx) { 1417 sde = &dd->per_sdma[this_idx]; 1418 sde->dd = dd; 1419 sde->ppd = ppd; 1420 sde->this_idx = this_idx; 1421 sde->descq_cnt = descq_cnt; 1422 sde->desc_avail = sdma_descq_freecnt(sde); 1423 sde->sdma_shift = ilog2(descq_cnt); 1424 sde->sdma_mask = (1 << sde->sdma_shift) - 1; 1425 1426 /* Create a mask specifically for each interrupt source */ 1427 sde->int_mask = (u64)1 << (0 * TXE_NUM_SDMA_ENGINES + 1428 this_idx); 1429 sde->progress_mask = (u64)1 << (1 * TXE_NUM_SDMA_ENGINES + 1430 this_idx); 1431 sde->idle_mask = (u64)1 << (2 * TXE_NUM_SDMA_ENGINES + 1432 this_idx); 1433 /* Create a combined mask to cover all 3 interrupt sources */ 1434 sde->imask = sde->int_mask | sde->progress_mask | 1435 sde->idle_mask; 1436 1437 spin_lock_init(&sde->tail_lock); 1438 seqlock_init(&sde->head_lock); 1439 spin_lock_init(&sde->senddmactrl_lock); 1440 spin_lock_init(&sde->flushlist_lock); 1441 seqlock_init(&sde->waitlock); 1442 /* insure there is always a zero bit */ 1443 sde->ahg_bits = 0xfffffffe00000000ULL; 1444 1445 sdma_set_state(sde, sdma_state_s00_hw_down); 1446 1447 /* set up reference counting */ 1448 kref_init(&sde->state.kref); 1449 init_completion(&sde->state.comp); 1450 1451 INIT_LIST_HEAD(&sde->flushlist); 1452 INIT_LIST_HEAD(&sde->dmawait); 1453 1454 sde->tail_csr = 1455 get_kctxt_csr_addr(dd, this_idx, SD(TAIL)); 1456 1457 tasklet_init(&sde->sdma_hw_clean_up_task, sdma_hw_clean_up_task, 1458 (unsigned long)sde); 1459 1460 tasklet_init(&sde->sdma_sw_clean_up_task, sdma_sw_clean_up_task, 1461 (unsigned long)sde); 1462 INIT_WORK(&sde->err_halt_worker, sdma_err_halt_wait); 1463 INIT_WORK(&sde->flush_worker, sdma_field_flush); 1464 1465 sde->progress_check_head = 0; 1466 1467 timer_setup(&sde->err_progress_check_timer, 1468 sdma_err_progress_check, 0); 1469 1470 sde->descq = dma_alloc_coherent(&dd->pcidev->dev, 1471 descq_cnt * sizeof(u64[2]), 1472 &sde->descq_phys, GFP_KERNEL); 1473 if (!sde->descq) 1474 goto bail; 1475 sde->tx_ring = 1476 kvzalloc_node(array_size(descq_cnt, 1477 sizeof(struct sdma_txreq *)), 1478 GFP_KERNEL, dd->node); 1479 if (!sde->tx_ring) 1480 goto bail; 1481 } 1482 1483 dd->sdma_heads_size = L1_CACHE_BYTES * num_engines; 1484 /* Allocate memory for DMA of head registers to memory */ 1485 dd->sdma_heads_dma = dma_alloc_coherent(&dd->pcidev->dev, 1486 dd->sdma_heads_size, 1487 &dd->sdma_heads_phys, 1488 GFP_KERNEL); 1489 if (!dd->sdma_heads_dma) { 1490 dd_dev_err(dd, "failed to allocate SendDMA head memory\n"); 1491 goto bail; 1492 } 1493 1494 /* Allocate memory for pad */ 1495 dd->sdma_pad_dma = dma_alloc_coherent(&dd->pcidev->dev, SDMA_PAD, 1496 &dd->sdma_pad_phys, GFP_KERNEL); 1497 if (!dd->sdma_pad_dma) { 1498 dd_dev_err(dd, "failed to allocate SendDMA pad memory\n"); 1499 goto bail; 1500 } 1501 1502 /* assign each engine to different cacheline and init registers */ 1503 curr_head = (void *)dd->sdma_heads_dma; 1504 for (this_idx = 0; this_idx < num_engines; ++this_idx) { 1505 unsigned long phys_offset; 1506 1507 sde = &dd->per_sdma[this_idx]; 1508 1509 sde->head_dma = curr_head; 1510 curr_head += L1_CACHE_BYTES; 1511 phys_offset = (unsigned long)sde->head_dma - 1512 (unsigned long)dd->sdma_heads_dma; 1513 sde->head_phys = dd->sdma_heads_phys + phys_offset; 1514 init_sdma_regs(sde, per_sdma_credits, idle_cnt); 1515 } 1516 dd->flags |= HFI1_HAS_SEND_DMA; 1517 dd->flags |= idle_cnt ? HFI1_HAS_SDMA_TIMEOUT : 0; 1518 dd->num_sdma = num_engines; 1519 ret = sdma_map_init(dd, port, ppd->vls_operational, NULL); 1520 if (ret < 0) 1521 goto bail; 1522 1523 tmp_sdma_rht = kzalloc(sizeof(*tmp_sdma_rht), GFP_KERNEL); 1524 if (!tmp_sdma_rht) { 1525 ret = -ENOMEM; 1526 goto bail; 1527 } 1528 1529 ret = rhashtable_init(tmp_sdma_rht, &sdma_rht_params); 1530 if (ret < 0) { 1531 kfree(tmp_sdma_rht); 1532 goto bail; 1533 } 1534 1535 dd->sdma_rht = tmp_sdma_rht; 1536 1537 dd_dev_info(dd, "SDMA num_sdma: %u\n", dd->num_sdma); 1538 return 0; 1539 1540 bail: 1541 sdma_clean(dd, num_engines); 1542 return ret; 1543 } 1544 1545 /** 1546 * sdma_all_running() - called when the link goes up 1547 * @dd: hfi1_devdata 1548 * 1549 * This routine moves all engines to the running state. 1550 */ 1551 void sdma_all_running(struct hfi1_devdata *dd) 1552 { 1553 struct sdma_engine *sde; 1554 unsigned int i; 1555 1556 /* move all engines to running */ 1557 for (i = 0; i < dd->num_sdma; ++i) { 1558 sde = &dd->per_sdma[i]; 1559 sdma_process_event(sde, sdma_event_e30_go_running); 1560 } 1561 } 1562 1563 /** 1564 * sdma_all_idle() - called when the link goes down 1565 * @dd: hfi1_devdata 1566 * 1567 * This routine moves all engines to the idle state. 1568 */ 1569 void sdma_all_idle(struct hfi1_devdata *dd) 1570 { 1571 struct sdma_engine *sde; 1572 unsigned int i; 1573 1574 /* idle all engines */ 1575 for (i = 0; i < dd->num_sdma; ++i) { 1576 sde = &dd->per_sdma[i]; 1577 sdma_process_event(sde, sdma_event_e70_go_idle); 1578 } 1579 } 1580 1581 /** 1582 * sdma_start() - called to kick off state processing for all engines 1583 * @dd: hfi1_devdata 1584 * 1585 * This routine is for kicking off the state processing for all required 1586 * sdma engines. Interrupts need to be working at this point. 1587 * 1588 */ 1589 void sdma_start(struct hfi1_devdata *dd) 1590 { 1591 unsigned i; 1592 struct sdma_engine *sde; 1593 1594 /* kick off the engines state processing */ 1595 for (i = 0; i < dd->num_sdma; ++i) { 1596 sde = &dd->per_sdma[i]; 1597 sdma_process_event(sde, sdma_event_e10_go_hw_start); 1598 } 1599 } 1600 1601 /** 1602 * sdma_exit() - used when module is removed 1603 * @dd: hfi1_devdata 1604 */ 1605 void sdma_exit(struct hfi1_devdata *dd) 1606 { 1607 unsigned this_idx; 1608 struct sdma_engine *sde; 1609 1610 for (this_idx = 0; dd->per_sdma && this_idx < dd->num_sdma; 1611 ++this_idx) { 1612 sde = &dd->per_sdma[this_idx]; 1613 if (!list_empty(&sde->dmawait)) 1614 dd_dev_err(dd, "sde %u: dmawait list not empty!\n", 1615 sde->this_idx); 1616 sdma_process_event(sde, sdma_event_e00_go_hw_down); 1617 1618 del_timer_sync(&sde->err_progress_check_timer); 1619 1620 /* 1621 * This waits for the state machine to exit so it is not 1622 * necessary to kill the sdma_sw_clean_up_task to make sure 1623 * it is not running. 1624 */ 1625 sdma_finalput(&sde->state); 1626 } 1627 } 1628 1629 /* 1630 * unmap the indicated descriptor 1631 */ 1632 static inline void sdma_unmap_desc( 1633 struct hfi1_devdata *dd, 1634 struct sdma_desc *descp) 1635 { 1636 switch (sdma_mapping_type(descp)) { 1637 case SDMA_MAP_SINGLE: 1638 dma_unmap_single( 1639 &dd->pcidev->dev, 1640 sdma_mapping_addr(descp), 1641 sdma_mapping_len(descp), 1642 DMA_TO_DEVICE); 1643 break; 1644 case SDMA_MAP_PAGE: 1645 dma_unmap_page( 1646 &dd->pcidev->dev, 1647 sdma_mapping_addr(descp), 1648 sdma_mapping_len(descp), 1649 DMA_TO_DEVICE); 1650 break; 1651 } 1652 } 1653 1654 /* 1655 * return the mode as indicated by the first 1656 * descriptor in the tx. 1657 */ 1658 static inline u8 ahg_mode(struct sdma_txreq *tx) 1659 { 1660 return (tx->descp[0].qw[1] & SDMA_DESC1_HEADER_MODE_SMASK) 1661 >> SDMA_DESC1_HEADER_MODE_SHIFT; 1662 } 1663 1664 /** 1665 * __sdma_txclean() - clean tx of mappings, descp *kmalloc's 1666 * @dd: hfi1_devdata for unmapping 1667 * @tx: tx request to clean 1668 * 1669 * This is used in the progress routine to clean the tx or 1670 * by the ULP to toss an in-process tx build. 1671 * 1672 * The code can be called multiple times without issue. 1673 * 1674 */ 1675 void __sdma_txclean( 1676 struct hfi1_devdata *dd, 1677 struct sdma_txreq *tx) 1678 { 1679 u16 i; 1680 1681 if (tx->num_desc) { 1682 u8 skip = 0, mode = ahg_mode(tx); 1683 1684 /* unmap first */ 1685 sdma_unmap_desc(dd, &tx->descp[0]); 1686 /* determine number of AHG descriptors to skip */ 1687 if (mode > SDMA_AHG_APPLY_UPDATE1) 1688 skip = mode >> 1; 1689 for (i = 1 + skip; i < tx->num_desc; i++) 1690 sdma_unmap_desc(dd, &tx->descp[i]); 1691 tx->num_desc = 0; 1692 } 1693 kfree(tx->coalesce_buf); 1694 tx->coalesce_buf = NULL; 1695 /* kmalloc'ed descp */ 1696 if (unlikely(tx->desc_limit > ARRAY_SIZE(tx->descs))) { 1697 tx->desc_limit = ARRAY_SIZE(tx->descs); 1698 kfree(tx->descp); 1699 } 1700 } 1701 1702 static inline u16 sdma_gethead(struct sdma_engine *sde) 1703 { 1704 struct hfi1_devdata *dd = sde->dd; 1705 int use_dmahead; 1706 u16 hwhead; 1707 1708 #ifdef CONFIG_SDMA_VERBOSITY 1709 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n", 1710 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__); 1711 #endif 1712 1713 retry: 1714 use_dmahead = HFI1_CAP_IS_KSET(USE_SDMA_HEAD) && __sdma_running(sde) && 1715 (dd->flags & HFI1_HAS_SDMA_TIMEOUT); 1716 hwhead = use_dmahead ? 1717 (u16)le64_to_cpu(*sde->head_dma) : 1718 (u16)read_sde_csr(sde, SD(HEAD)); 1719 1720 if (unlikely(HFI1_CAP_IS_KSET(SDMA_HEAD_CHECK))) { 1721 u16 cnt; 1722 u16 swtail; 1723 u16 swhead; 1724 int sane; 1725 1726 swhead = sde->descq_head & sde->sdma_mask; 1727 /* this code is really bad for cache line trading */ 1728 swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask; 1729 cnt = sde->descq_cnt; 1730 1731 if (swhead < swtail) 1732 /* not wrapped */ 1733 sane = (hwhead >= swhead) & (hwhead <= swtail); 1734 else if (swhead > swtail) 1735 /* wrapped around */ 1736 sane = ((hwhead >= swhead) && (hwhead < cnt)) || 1737 (hwhead <= swtail); 1738 else 1739 /* empty */ 1740 sane = (hwhead == swhead); 1741 1742 if (unlikely(!sane)) { 1743 dd_dev_err(dd, "SDMA(%u) bad head (%s) hwhd=%hu swhd=%hu swtl=%hu cnt=%hu\n", 1744 sde->this_idx, 1745 use_dmahead ? "dma" : "kreg", 1746 hwhead, swhead, swtail, cnt); 1747 if (use_dmahead) { 1748 /* try one more time, using csr */ 1749 use_dmahead = 0; 1750 goto retry; 1751 } 1752 /* proceed as if no progress */ 1753 hwhead = swhead; 1754 } 1755 } 1756 return hwhead; 1757 } 1758 1759 /* 1760 * This is called when there are send DMA descriptors that might be 1761 * available. 1762 * 1763 * This is called with head_lock held. 1764 */ 1765 static void sdma_desc_avail(struct sdma_engine *sde, uint avail) 1766 { 1767 struct iowait *wait, *nw, *twait; 1768 struct iowait *waits[SDMA_WAIT_BATCH_SIZE]; 1769 uint i, n = 0, seq, tidx = 0; 1770 1771 #ifdef CONFIG_SDMA_VERBOSITY 1772 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n", sde->this_idx, 1773 slashstrip(__FILE__), __LINE__, __func__); 1774 dd_dev_err(sde->dd, "avail: %u\n", avail); 1775 #endif 1776 1777 do { 1778 seq = read_seqbegin(&sde->waitlock); 1779 if (!list_empty(&sde->dmawait)) { 1780 /* at least one item */ 1781 write_seqlock(&sde->waitlock); 1782 /* Harvest waiters wanting DMA descriptors */ 1783 list_for_each_entry_safe( 1784 wait, 1785 nw, 1786 &sde->dmawait, 1787 list) { 1788 u32 num_desc; 1789 1790 if (!wait->wakeup) 1791 continue; 1792 if (n == ARRAY_SIZE(waits)) 1793 break; 1794 iowait_init_priority(wait); 1795 num_desc = iowait_get_all_desc(wait); 1796 if (num_desc > avail) 1797 break; 1798 avail -= num_desc; 1799 /* Find the top-priority wait memeber */ 1800 if (n) { 1801 twait = waits[tidx]; 1802 tidx = 1803 iowait_priority_update_top(wait, 1804 twait, 1805 n, 1806 tidx); 1807 } 1808 list_del_init(&wait->list); 1809 waits[n++] = wait; 1810 } 1811 write_sequnlock(&sde->waitlock); 1812 break; 1813 } 1814 } while (read_seqretry(&sde->waitlock, seq)); 1815 1816 /* Schedule the top-priority entry first */ 1817 if (n) 1818 waits[tidx]->wakeup(waits[tidx], SDMA_AVAIL_REASON); 1819 1820 for (i = 0; i < n; i++) 1821 if (i != tidx) 1822 waits[i]->wakeup(waits[i], SDMA_AVAIL_REASON); 1823 } 1824 1825 /* head_lock must be held */ 1826 static void sdma_make_progress(struct sdma_engine *sde, u64 status) 1827 { 1828 struct sdma_txreq *txp = NULL; 1829 int progress = 0; 1830 u16 hwhead, swhead; 1831 int idle_check_done = 0; 1832 1833 hwhead = sdma_gethead(sde); 1834 1835 /* The reason for some of the complexity of this code is that 1836 * not all descriptors have corresponding txps. So, we have to 1837 * be able to skip over descs until we wander into the range of 1838 * the next txp on the list. 1839 */ 1840 1841 retry: 1842 txp = get_txhead(sde); 1843 swhead = sde->descq_head & sde->sdma_mask; 1844 trace_hfi1_sdma_progress(sde, hwhead, swhead, txp); 1845 while (swhead != hwhead) { 1846 /* advance head, wrap if needed */ 1847 swhead = ++sde->descq_head & sde->sdma_mask; 1848 1849 /* if now past this txp's descs, do the callback */ 1850 if (txp && txp->next_descq_idx == swhead) { 1851 /* remove from list */ 1852 sde->tx_ring[sde->tx_head++ & sde->sdma_mask] = NULL; 1853 complete_tx(sde, txp, SDMA_TXREQ_S_OK); 1854 /* see if there is another txp */ 1855 txp = get_txhead(sde); 1856 } 1857 trace_hfi1_sdma_progress(sde, hwhead, swhead, txp); 1858 progress++; 1859 } 1860 1861 /* 1862 * The SDMA idle interrupt is not guaranteed to be ordered with respect 1863 * to updates to the the dma_head location in host memory. The head 1864 * value read might not be fully up to date. If there are pending 1865 * descriptors and the SDMA idle interrupt fired then read from the 1866 * CSR SDMA head instead to get the latest value from the hardware. 1867 * The hardware SDMA head should be read at most once in this invocation 1868 * of sdma_make_progress(..) which is ensured by idle_check_done flag 1869 */ 1870 if ((status & sde->idle_mask) && !idle_check_done) { 1871 u16 swtail; 1872 1873 swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask; 1874 if (swtail != hwhead) { 1875 hwhead = (u16)read_sde_csr(sde, SD(HEAD)); 1876 idle_check_done = 1; 1877 goto retry; 1878 } 1879 } 1880 1881 sde->last_status = status; 1882 if (progress) 1883 sdma_desc_avail(sde, sdma_descq_freecnt(sde)); 1884 } 1885 1886 /* 1887 * sdma_engine_interrupt() - interrupt handler for engine 1888 * @sde: sdma engine 1889 * @status: sdma interrupt reason 1890 * 1891 * Status is a mask of the 3 possible interrupts for this engine. It will 1892 * contain bits _only_ for this SDMA engine. It will contain at least one 1893 * bit, it may contain more. 1894 */ 1895 void sdma_engine_interrupt(struct sdma_engine *sde, u64 status) 1896 { 1897 trace_hfi1_sdma_engine_interrupt(sde, status); 1898 write_seqlock(&sde->head_lock); 1899 sdma_set_desc_cnt(sde, sdma_desct_intr); 1900 if (status & sde->idle_mask) 1901 sde->idle_int_cnt++; 1902 else if (status & sde->progress_mask) 1903 sde->progress_int_cnt++; 1904 else if (status & sde->int_mask) 1905 sde->sdma_int_cnt++; 1906 sdma_make_progress(sde, status); 1907 write_sequnlock(&sde->head_lock); 1908 } 1909 1910 /** 1911 * sdma_engine_error() - error handler for engine 1912 * @sde: sdma engine 1913 * @status: sdma interrupt reason 1914 */ 1915 void sdma_engine_error(struct sdma_engine *sde, u64 status) 1916 { 1917 unsigned long flags; 1918 1919 #ifdef CONFIG_SDMA_VERBOSITY 1920 dd_dev_err(sde->dd, "CONFIG SDMA(%u) error status 0x%llx state %s\n", 1921 sde->this_idx, 1922 (unsigned long long)status, 1923 sdma_state_names[sde->state.current_state]); 1924 #endif 1925 spin_lock_irqsave(&sde->tail_lock, flags); 1926 write_seqlock(&sde->head_lock); 1927 if (status & ALL_SDMA_ENG_HALT_ERRS) 1928 __sdma_process_event(sde, sdma_event_e60_hw_halted); 1929 if (status & ~SD(ENG_ERR_STATUS_SDMA_HALT_ERR_SMASK)) { 1930 dd_dev_err(sde->dd, 1931 "SDMA (%u) engine error: 0x%llx state %s\n", 1932 sde->this_idx, 1933 (unsigned long long)status, 1934 sdma_state_names[sde->state.current_state]); 1935 dump_sdma_state(sde); 1936 } 1937 write_sequnlock(&sde->head_lock); 1938 spin_unlock_irqrestore(&sde->tail_lock, flags); 1939 } 1940 1941 static void sdma_sendctrl(struct sdma_engine *sde, unsigned op) 1942 { 1943 u64 set_senddmactrl = 0; 1944 u64 clr_senddmactrl = 0; 1945 unsigned long flags; 1946 1947 #ifdef CONFIG_SDMA_VERBOSITY 1948 dd_dev_err(sde->dd, "CONFIG SDMA(%u) senddmactrl E=%d I=%d H=%d C=%d\n", 1949 sde->this_idx, 1950 (op & SDMA_SENDCTRL_OP_ENABLE) ? 1 : 0, 1951 (op & SDMA_SENDCTRL_OP_INTENABLE) ? 1 : 0, 1952 (op & SDMA_SENDCTRL_OP_HALT) ? 1 : 0, 1953 (op & SDMA_SENDCTRL_OP_CLEANUP) ? 1 : 0); 1954 #endif 1955 1956 if (op & SDMA_SENDCTRL_OP_ENABLE) 1957 set_senddmactrl |= SD(CTRL_SDMA_ENABLE_SMASK); 1958 else 1959 clr_senddmactrl |= SD(CTRL_SDMA_ENABLE_SMASK); 1960 1961 if (op & SDMA_SENDCTRL_OP_INTENABLE) 1962 set_senddmactrl |= SD(CTRL_SDMA_INT_ENABLE_SMASK); 1963 else 1964 clr_senddmactrl |= SD(CTRL_SDMA_INT_ENABLE_SMASK); 1965 1966 if (op & SDMA_SENDCTRL_OP_HALT) 1967 set_senddmactrl |= SD(CTRL_SDMA_HALT_SMASK); 1968 else 1969 clr_senddmactrl |= SD(CTRL_SDMA_HALT_SMASK); 1970 1971 spin_lock_irqsave(&sde->senddmactrl_lock, flags); 1972 1973 sde->p_senddmactrl |= set_senddmactrl; 1974 sde->p_senddmactrl &= ~clr_senddmactrl; 1975 1976 if (op & SDMA_SENDCTRL_OP_CLEANUP) 1977 write_sde_csr(sde, SD(CTRL), 1978 sde->p_senddmactrl | 1979 SD(CTRL_SDMA_CLEANUP_SMASK)); 1980 else 1981 write_sde_csr(sde, SD(CTRL), sde->p_senddmactrl); 1982 1983 spin_unlock_irqrestore(&sde->senddmactrl_lock, flags); 1984 1985 #ifdef CONFIG_SDMA_VERBOSITY 1986 sdma_dumpstate(sde); 1987 #endif 1988 } 1989 1990 static void sdma_setlengen(struct sdma_engine *sde) 1991 { 1992 #ifdef CONFIG_SDMA_VERBOSITY 1993 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n", 1994 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__); 1995 #endif 1996 1997 /* 1998 * Set SendDmaLenGen and clear-then-set the MSB of the generation 1999 * count to enable generation checking and load the internal 2000 * generation counter. 2001 */ 2002 write_sde_csr(sde, SD(LEN_GEN), 2003 (sde->descq_cnt / 64) << SD(LEN_GEN_LENGTH_SHIFT)); 2004 write_sde_csr(sde, SD(LEN_GEN), 2005 ((sde->descq_cnt / 64) << SD(LEN_GEN_LENGTH_SHIFT)) | 2006 (4ULL << SD(LEN_GEN_GENERATION_SHIFT))); 2007 } 2008 2009 static inline void sdma_update_tail(struct sdma_engine *sde, u16 tail) 2010 { 2011 /* Commit writes to memory and advance the tail on the chip */ 2012 smp_wmb(); /* see get_txhead() */ 2013 writeq(tail, sde->tail_csr); 2014 } 2015 2016 /* 2017 * This is called when changing to state s10_hw_start_up_halt_wait as 2018 * a result of send buffer errors or send DMA descriptor errors. 2019 */ 2020 static void sdma_hw_start_up(struct sdma_engine *sde) 2021 { 2022 u64 reg; 2023 2024 #ifdef CONFIG_SDMA_VERBOSITY 2025 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n", 2026 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__); 2027 #endif 2028 2029 sdma_setlengen(sde); 2030 sdma_update_tail(sde, 0); /* Set SendDmaTail */ 2031 *sde->head_dma = 0; 2032 2033 reg = SD(ENG_ERR_CLEAR_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_MASK) << 2034 SD(ENG_ERR_CLEAR_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_SHIFT); 2035 write_sde_csr(sde, SD(ENG_ERR_CLEAR), reg); 2036 } 2037 2038 /* 2039 * set_sdma_integrity 2040 * 2041 * Set the SEND_DMA_CHECK_ENABLE register for send DMA engine 'sde'. 2042 */ 2043 static void set_sdma_integrity(struct sdma_engine *sde) 2044 { 2045 struct hfi1_devdata *dd = sde->dd; 2046 2047 write_sde_csr(sde, SD(CHECK_ENABLE), 2048 hfi1_pkt_base_sdma_integrity(dd)); 2049 } 2050 2051 static void init_sdma_regs( 2052 struct sdma_engine *sde, 2053 u32 credits, 2054 uint idle_cnt) 2055 { 2056 u8 opval, opmask; 2057 #ifdef CONFIG_SDMA_VERBOSITY 2058 struct hfi1_devdata *dd = sde->dd; 2059 2060 dd_dev_err(dd, "CONFIG SDMA(%u) %s:%d %s()\n", 2061 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__); 2062 #endif 2063 2064 write_sde_csr(sde, SD(BASE_ADDR), sde->descq_phys); 2065 sdma_setlengen(sde); 2066 sdma_update_tail(sde, 0); /* Set SendDmaTail */ 2067 write_sde_csr(sde, SD(RELOAD_CNT), idle_cnt); 2068 write_sde_csr(sde, SD(DESC_CNT), 0); 2069 write_sde_csr(sde, SD(HEAD_ADDR), sde->head_phys); 2070 write_sde_csr(sde, SD(MEMORY), 2071 ((u64)credits << SD(MEMORY_SDMA_MEMORY_CNT_SHIFT)) | 2072 ((u64)(credits * sde->this_idx) << 2073 SD(MEMORY_SDMA_MEMORY_INDEX_SHIFT))); 2074 write_sde_csr(sde, SD(ENG_ERR_MASK), ~0ull); 2075 set_sdma_integrity(sde); 2076 opmask = OPCODE_CHECK_MASK_DISABLED; 2077 opval = OPCODE_CHECK_VAL_DISABLED; 2078 write_sde_csr(sde, SD(CHECK_OPCODE), 2079 (opmask << SEND_CTXT_CHECK_OPCODE_MASK_SHIFT) | 2080 (opval << SEND_CTXT_CHECK_OPCODE_VALUE_SHIFT)); 2081 } 2082 2083 #ifdef CONFIG_SDMA_VERBOSITY 2084 2085 #define sdma_dumpstate_helper0(reg) do { \ 2086 csr = read_csr(sde->dd, reg); \ 2087 dd_dev_err(sde->dd, "%36s 0x%016llx\n", #reg, csr); \ 2088 } while (0) 2089 2090 #define sdma_dumpstate_helper(reg) do { \ 2091 csr = read_sde_csr(sde, reg); \ 2092 dd_dev_err(sde->dd, "%36s[%02u] 0x%016llx\n", \ 2093 #reg, sde->this_idx, csr); \ 2094 } while (0) 2095 2096 #define sdma_dumpstate_helper2(reg) do { \ 2097 csr = read_csr(sde->dd, reg + (8 * i)); \ 2098 dd_dev_err(sde->dd, "%33s_%02u 0x%016llx\n", \ 2099 #reg, i, csr); \ 2100 } while (0) 2101 2102 void sdma_dumpstate(struct sdma_engine *sde) 2103 { 2104 u64 csr; 2105 unsigned i; 2106 2107 sdma_dumpstate_helper(SD(CTRL)); 2108 sdma_dumpstate_helper(SD(STATUS)); 2109 sdma_dumpstate_helper0(SD(ERR_STATUS)); 2110 sdma_dumpstate_helper0(SD(ERR_MASK)); 2111 sdma_dumpstate_helper(SD(ENG_ERR_STATUS)); 2112 sdma_dumpstate_helper(SD(ENG_ERR_MASK)); 2113 2114 for (i = 0; i < CCE_NUM_INT_CSRS; ++i) { 2115 sdma_dumpstate_helper2(CCE_INT_STATUS); 2116 sdma_dumpstate_helper2(CCE_INT_MASK); 2117 sdma_dumpstate_helper2(CCE_INT_BLOCKED); 2118 } 2119 2120 sdma_dumpstate_helper(SD(TAIL)); 2121 sdma_dumpstate_helper(SD(HEAD)); 2122 sdma_dumpstate_helper(SD(PRIORITY_THLD)); 2123 sdma_dumpstate_helper(SD(IDLE_CNT)); 2124 sdma_dumpstate_helper(SD(RELOAD_CNT)); 2125 sdma_dumpstate_helper(SD(DESC_CNT)); 2126 sdma_dumpstate_helper(SD(DESC_FETCHED_CNT)); 2127 sdma_dumpstate_helper(SD(MEMORY)); 2128 sdma_dumpstate_helper0(SD(ENGINES)); 2129 sdma_dumpstate_helper0(SD(MEM_SIZE)); 2130 /* sdma_dumpstate_helper(SEND_EGRESS_SEND_DMA_STATUS); */ 2131 sdma_dumpstate_helper(SD(BASE_ADDR)); 2132 sdma_dumpstate_helper(SD(LEN_GEN)); 2133 sdma_dumpstate_helper(SD(HEAD_ADDR)); 2134 sdma_dumpstate_helper(SD(CHECK_ENABLE)); 2135 sdma_dumpstate_helper(SD(CHECK_VL)); 2136 sdma_dumpstate_helper(SD(CHECK_JOB_KEY)); 2137 sdma_dumpstate_helper(SD(CHECK_PARTITION_KEY)); 2138 sdma_dumpstate_helper(SD(CHECK_SLID)); 2139 sdma_dumpstate_helper(SD(CHECK_OPCODE)); 2140 } 2141 #endif 2142 2143 static void dump_sdma_state(struct sdma_engine *sde) 2144 { 2145 struct hw_sdma_desc *descqp; 2146 u64 desc[2]; 2147 u64 addr; 2148 u8 gen; 2149 u16 len; 2150 u16 head, tail, cnt; 2151 2152 head = sde->descq_head & sde->sdma_mask; 2153 tail = sde->descq_tail & sde->sdma_mask; 2154 cnt = sdma_descq_freecnt(sde); 2155 2156 dd_dev_err(sde->dd, 2157 "SDMA (%u) descq_head: %u descq_tail: %u freecnt: %u FLE %d\n", 2158 sde->this_idx, head, tail, cnt, 2159 !list_empty(&sde->flushlist)); 2160 2161 /* print info for each entry in the descriptor queue */ 2162 while (head != tail) { 2163 char flags[6] = { 'x', 'x', 'x', 'x', 0 }; 2164 2165 descqp = &sde->descq[head]; 2166 desc[0] = le64_to_cpu(descqp->qw[0]); 2167 desc[1] = le64_to_cpu(descqp->qw[1]); 2168 flags[0] = (desc[1] & SDMA_DESC1_INT_REQ_FLAG) ? 'I' : '-'; 2169 flags[1] = (desc[1] & SDMA_DESC1_HEAD_TO_HOST_FLAG) ? 2170 'H' : '-'; 2171 flags[2] = (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) ? 'F' : '-'; 2172 flags[3] = (desc[0] & SDMA_DESC0_LAST_DESC_FLAG) ? 'L' : '-'; 2173 addr = (desc[0] >> SDMA_DESC0_PHY_ADDR_SHIFT) 2174 & SDMA_DESC0_PHY_ADDR_MASK; 2175 gen = (desc[1] >> SDMA_DESC1_GENERATION_SHIFT) 2176 & SDMA_DESC1_GENERATION_MASK; 2177 len = (desc[0] >> SDMA_DESC0_BYTE_COUNT_SHIFT) 2178 & SDMA_DESC0_BYTE_COUNT_MASK; 2179 dd_dev_err(sde->dd, 2180 "SDMA sdmadesc[%u]: flags:%s addr:0x%016llx gen:%u len:%u bytes\n", 2181 head, flags, addr, gen, len); 2182 dd_dev_err(sde->dd, 2183 "\tdesc0:0x%016llx desc1 0x%016llx\n", 2184 desc[0], desc[1]); 2185 if (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) 2186 dd_dev_err(sde->dd, 2187 "\taidx: %u amode: %u alen: %u\n", 2188 (u8)((desc[1] & 2189 SDMA_DESC1_HEADER_INDEX_SMASK) >> 2190 SDMA_DESC1_HEADER_INDEX_SHIFT), 2191 (u8)((desc[1] & 2192 SDMA_DESC1_HEADER_MODE_SMASK) >> 2193 SDMA_DESC1_HEADER_MODE_SHIFT), 2194 (u8)((desc[1] & 2195 SDMA_DESC1_HEADER_DWS_SMASK) >> 2196 SDMA_DESC1_HEADER_DWS_SHIFT)); 2197 head++; 2198 head &= sde->sdma_mask; 2199 } 2200 } 2201 2202 #define SDE_FMT \ 2203 "SDE %u CPU %d STE %s C 0x%llx S 0x%016llx E 0x%llx T(HW) 0x%llx T(SW) 0x%x H(HW) 0x%llx H(SW) 0x%x H(D) 0x%llx DM 0x%llx GL 0x%llx R 0x%llx LIS 0x%llx AHGI 0x%llx TXT %u TXH %u DT %u DH %u FLNE %d DQF %u SLC 0x%llx\n" 2204 /** 2205 * sdma_seqfile_dump_sde() - debugfs dump of sde 2206 * @s: seq file 2207 * @sde: send dma engine to dump 2208 * 2209 * This routine dumps the sde to the indicated seq file. 2210 */ 2211 void sdma_seqfile_dump_sde(struct seq_file *s, struct sdma_engine *sde) 2212 { 2213 u16 head, tail; 2214 struct hw_sdma_desc *descqp; 2215 u64 desc[2]; 2216 u64 addr; 2217 u8 gen; 2218 u16 len; 2219 2220 head = sde->descq_head & sde->sdma_mask; 2221 tail = READ_ONCE(sde->descq_tail) & sde->sdma_mask; 2222 seq_printf(s, SDE_FMT, sde->this_idx, 2223 sde->cpu, 2224 sdma_state_name(sde->state.current_state), 2225 (unsigned long long)read_sde_csr(sde, SD(CTRL)), 2226 (unsigned long long)read_sde_csr(sde, SD(STATUS)), 2227 (unsigned long long)read_sde_csr(sde, SD(ENG_ERR_STATUS)), 2228 (unsigned long long)read_sde_csr(sde, SD(TAIL)), tail, 2229 (unsigned long long)read_sde_csr(sde, SD(HEAD)), head, 2230 (unsigned long long)le64_to_cpu(*sde->head_dma), 2231 (unsigned long long)read_sde_csr(sde, SD(MEMORY)), 2232 (unsigned long long)read_sde_csr(sde, SD(LEN_GEN)), 2233 (unsigned long long)read_sde_csr(sde, SD(RELOAD_CNT)), 2234 (unsigned long long)sde->last_status, 2235 (unsigned long long)sde->ahg_bits, 2236 sde->tx_tail, 2237 sde->tx_head, 2238 sde->descq_tail, 2239 sde->descq_head, 2240 !list_empty(&sde->flushlist), 2241 sde->descq_full_count, 2242 (unsigned long long)read_sde_csr(sde, SEND_DMA_CHECK_SLID)); 2243 2244 /* print info for each entry in the descriptor queue */ 2245 while (head != tail) { 2246 char flags[6] = { 'x', 'x', 'x', 'x', 0 }; 2247 2248 descqp = &sde->descq[head]; 2249 desc[0] = le64_to_cpu(descqp->qw[0]); 2250 desc[1] = le64_to_cpu(descqp->qw[1]); 2251 flags[0] = (desc[1] & SDMA_DESC1_INT_REQ_FLAG) ? 'I' : '-'; 2252 flags[1] = (desc[1] & SDMA_DESC1_HEAD_TO_HOST_FLAG) ? 2253 'H' : '-'; 2254 flags[2] = (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) ? 'F' : '-'; 2255 flags[3] = (desc[0] & SDMA_DESC0_LAST_DESC_FLAG) ? 'L' : '-'; 2256 addr = (desc[0] >> SDMA_DESC0_PHY_ADDR_SHIFT) 2257 & SDMA_DESC0_PHY_ADDR_MASK; 2258 gen = (desc[1] >> SDMA_DESC1_GENERATION_SHIFT) 2259 & SDMA_DESC1_GENERATION_MASK; 2260 len = (desc[0] >> SDMA_DESC0_BYTE_COUNT_SHIFT) 2261 & SDMA_DESC0_BYTE_COUNT_MASK; 2262 seq_printf(s, 2263 "\tdesc[%u]: flags:%s addr:0x%016llx gen:%u len:%u bytes\n", 2264 head, flags, addr, gen, len); 2265 if (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) 2266 seq_printf(s, "\t\tahgidx: %u ahgmode: %u\n", 2267 (u8)((desc[1] & 2268 SDMA_DESC1_HEADER_INDEX_SMASK) >> 2269 SDMA_DESC1_HEADER_INDEX_SHIFT), 2270 (u8)((desc[1] & 2271 SDMA_DESC1_HEADER_MODE_SMASK) >> 2272 SDMA_DESC1_HEADER_MODE_SHIFT)); 2273 head = (head + 1) & sde->sdma_mask; 2274 } 2275 } 2276 2277 /* 2278 * add the generation number into 2279 * the qw1 and return 2280 */ 2281 static inline u64 add_gen(struct sdma_engine *sde, u64 qw1) 2282 { 2283 u8 generation = (sde->descq_tail >> sde->sdma_shift) & 3; 2284 2285 qw1 &= ~SDMA_DESC1_GENERATION_SMASK; 2286 qw1 |= ((u64)generation & SDMA_DESC1_GENERATION_MASK) 2287 << SDMA_DESC1_GENERATION_SHIFT; 2288 return qw1; 2289 } 2290 2291 /* 2292 * This routine submits the indicated tx 2293 * 2294 * Space has already been guaranteed and 2295 * tail side of ring is locked. 2296 * 2297 * The hardware tail update is done 2298 * in the caller and that is facilitated 2299 * by returning the new tail. 2300 * 2301 * There is special case logic for ahg 2302 * to not add the generation number for 2303 * up to 2 descriptors that follow the 2304 * first descriptor. 2305 * 2306 */ 2307 static inline u16 submit_tx(struct sdma_engine *sde, struct sdma_txreq *tx) 2308 { 2309 int i; 2310 u16 tail; 2311 struct sdma_desc *descp = tx->descp; 2312 u8 skip = 0, mode = ahg_mode(tx); 2313 2314 tail = sde->descq_tail & sde->sdma_mask; 2315 sde->descq[tail].qw[0] = cpu_to_le64(descp->qw[0]); 2316 sde->descq[tail].qw[1] = cpu_to_le64(add_gen(sde, descp->qw[1])); 2317 trace_hfi1_sdma_descriptor(sde, descp->qw[0], descp->qw[1], 2318 tail, &sde->descq[tail]); 2319 tail = ++sde->descq_tail & sde->sdma_mask; 2320 descp++; 2321 if (mode > SDMA_AHG_APPLY_UPDATE1) 2322 skip = mode >> 1; 2323 for (i = 1; i < tx->num_desc; i++, descp++) { 2324 u64 qw1; 2325 2326 sde->descq[tail].qw[0] = cpu_to_le64(descp->qw[0]); 2327 if (skip) { 2328 /* edits don't have generation */ 2329 qw1 = descp->qw[1]; 2330 skip--; 2331 } else { 2332 /* replace generation with real one for non-edits */ 2333 qw1 = add_gen(sde, descp->qw[1]); 2334 } 2335 sde->descq[tail].qw[1] = cpu_to_le64(qw1); 2336 trace_hfi1_sdma_descriptor(sde, descp->qw[0], qw1, 2337 tail, &sde->descq[tail]); 2338 tail = ++sde->descq_tail & sde->sdma_mask; 2339 } 2340 tx->next_descq_idx = tail; 2341 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER 2342 tx->sn = sde->tail_sn++; 2343 trace_hfi1_sdma_in_sn(sde, tx->sn); 2344 WARN_ON_ONCE(sde->tx_ring[sde->tx_tail & sde->sdma_mask]); 2345 #endif 2346 sde->tx_ring[sde->tx_tail++ & sde->sdma_mask] = tx; 2347 sde->desc_avail -= tx->num_desc; 2348 return tail; 2349 } 2350 2351 /* 2352 * Check for progress 2353 */ 2354 static int sdma_check_progress( 2355 struct sdma_engine *sde, 2356 struct iowait_work *wait, 2357 struct sdma_txreq *tx, 2358 bool pkts_sent) 2359 { 2360 int ret; 2361 2362 sde->desc_avail = sdma_descq_freecnt(sde); 2363 if (tx->num_desc <= sde->desc_avail) 2364 return -EAGAIN; 2365 /* pulse the head_lock */ 2366 if (wait && iowait_ioww_to_iow(wait)->sleep) { 2367 unsigned seq; 2368 2369 seq = raw_seqcount_begin( 2370 (const seqcount_t *)&sde->head_lock.seqcount); 2371 ret = wait->iow->sleep(sde, wait, tx, seq, pkts_sent); 2372 if (ret == -EAGAIN) 2373 sde->desc_avail = sdma_descq_freecnt(sde); 2374 } else { 2375 ret = -EBUSY; 2376 } 2377 return ret; 2378 } 2379 2380 /** 2381 * sdma_send_txreq() - submit a tx req to ring 2382 * @sde: sdma engine to use 2383 * @wait: SE wait structure to use when full (may be NULL) 2384 * @tx: sdma_txreq to submit 2385 * @pkts_sent: has any packet been sent yet? 2386 * 2387 * The call submits the tx into the ring. If a iowait structure is non-NULL 2388 * the packet will be queued to the list in wait. 2389 * 2390 * Return: 2391 * 0 - Success, -EINVAL - sdma_txreq incomplete, -EBUSY - no space in 2392 * ring (wait == NULL) 2393 * -EIOCBQUEUED - tx queued to iowait, -ECOMM bad sdma state 2394 */ 2395 int sdma_send_txreq(struct sdma_engine *sde, 2396 struct iowait_work *wait, 2397 struct sdma_txreq *tx, 2398 bool pkts_sent) 2399 { 2400 int ret = 0; 2401 u16 tail; 2402 unsigned long flags; 2403 2404 /* user should have supplied entire packet */ 2405 if (unlikely(tx->tlen)) 2406 return -EINVAL; 2407 tx->wait = iowait_ioww_to_iow(wait); 2408 spin_lock_irqsave(&sde->tail_lock, flags); 2409 retry: 2410 if (unlikely(!__sdma_running(sde))) 2411 goto unlock_noconn; 2412 if (unlikely(tx->num_desc > sde->desc_avail)) 2413 goto nodesc; 2414 tail = submit_tx(sde, tx); 2415 if (wait) 2416 iowait_sdma_inc(iowait_ioww_to_iow(wait)); 2417 sdma_update_tail(sde, tail); 2418 unlock: 2419 spin_unlock_irqrestore(&sde->tail_lock, flags); 2420 return ret; 2421 unlock_noconn: 2422 if (wait) 2423 iowait_sdma_inc(iowait_ioww_to_iow(wait)); 2424 tx->next_descq_idx = 0; 2425 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER 2426 tx->sn = sde->tail_sn++; 2427 trace_hfi1_sdma_in_sn(sde, tx->sn); 2428 #endif 2429 spin_lock(&sde->flushlist_lock); 2430 list_add_tail(&tx->list, &sde->flushlist); 2431 spin_unlock(&sde->flushlist_lock); 2432 iowait_inc_wait_count(wait, tx->num_desc); 2433 queue_work_on(sde->cpu, system_highpri_wq, &sde->flush_worker); 2434 ret = -ECOMM; 2435 goto unlock; 2436 nodesc: 2437 ret = sdma_check_progress(sde, wait, tx, pkts_sent); 2438 if (ret == -EAGAIN) { 2439 ret = 0; 2440 goto retry; 2441 } 2442 sde->descq_full_count++; 2443 goto unlock; 2444 } 2445 2446 /** 2447 * sdma_send_txlist() - submit a list of tx req to ring 2448 * @sde: sdma engine to use 2449 * @wait: SE wait structure to use when full (may be NULL) 2450 * @tx_list: list of sdma_txreqs to submit 2451 * @count: pointer to a u16 which, after return will contain the total number of 2452 * sdma_txreqs removed from the tx_list. This will include sdma_txreqs 2453 * whose SDMA descriptors are submitted to the ring and the sdma_txreqs 2454 * which are added to SDMA engine flush list if the SDMA engine state is 2455 * not running. 2456 * 2457 * The call submits the list into the ring. 2458 * 2459 * If the iowait structure is non-NULL and not equal to the iowait list 2460 * the unprocessed part of the list will be appended to the list in wait. 2461 * 2462 * In all cases, the tx_list will be updated so the head of the tx_list is 2463 * the list of descriptors that have yet to be transmitted. 2464 * 2465 * The intent of this call is to provide a more efficient 2466 * way of submitting multiple packets to SDMA while holding the tail 2467 * side locking. 2468 * 2469 * Return: 2470 * 0 - Success, 2471 * -EINVAL - sdma_txreq incomplete, -EBUSY - no space in ring (wait == NULL) 2472 * -EIOCBQUEUED - tx queued to iowait, -ECOMM bad sdma state 2473 */ 2474 int sdma_send_txlist(struct sdma_engine *sde, struct iowait_work *wait, 2475 struct list_head *tx_list, u16 *count_out) 2476 { 2477 struct sdma_txreq *tx, *tx_next; 2478 int ret = 0; 2479 unsigned long flags; 2480 u16 tail = INVALID_TAIL; 2481 u32 submit_count = 0, flush_count = 0, total_count; 2482 2483 spin_lock_irqsave(&sde->tail_lock, flags); 2484 retry: 2485 list_for_each_entry_safe(tx, tx_next, tx_list, list) { 2486 tx->wait = iowait_ioww_to_iow(wait); 2487 if (unlikely(!__sdma_running(sde))) 2488 goto unlock_noconn; 2489 if (unlikely(tx->num_desc > sde->desc_avail)) 2490 goto nodesc; 2491 if (unlikely(tx->tlen)) { 2492 ret = -EINVAL; 2493 goto update_tail; 2494 } 2495 list_del_init(&tx->list); 2496 tail = submit_tx(sde, tx); 2497 submit_count++; 2498 if (tail != INVALID_TAIL && 2499 (submit_count & SDMA_TAIL_UPDATE_THRESH) == 0) { 2500 sdma_update_tail(sde, tail); 2501 tail = INVALID_TAIL; 2502 } 2503 } 2504 update_tail: 2505 total_count = submit_count + flush_count; 2506 if (wait) { 2507 iowait_sdma_add(iowait_ioww_to_iow(wait), total_count); 2508 iowait_starve_clear(submit_count > 0, 2509 iowait_ioww_to_iow(wait)); 2510 } 2511 if (tail != INVALID_TAIL) 2512 sdma_update_tail(sde, tail); 2513 spin_unlock_irqrestore(&sde->tail_lock, flags); 2514 *count_out = total_count; 2515 return ret; 2516 unlock_noconn: 2517 spin_lock(&sde->flushlist_lock); 2518 list_for_each_entry_safe(tx, tx_next, tx_list, list) { 2519 tx->wait = iowait_ioww_to_iow(wait); 2520 list_del_init(&tx->list); 2521 tx->next_descq_idx = 0; 2522 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER 2523 tx->sn = sde->tail_sn++; 2524 trace_hfi1_sdma_in_sn(sde, tx->sn); 2525 #endif 2526 list_add_tail(&tx->list, &sde->flushlist); 2527 flush_count++; 2528 iowait_inc_wait_count(wait, tx->num_desc); 2529 } 2530 spin_unlock(&sde->flushlist_lock); 2531 queue_work_on(sde->cpu, system_highpri_wq, &sde->flush_worker); 2532 ret = -ECOMM; 2533 goto update_tail; 2534 nodesc: 2535 ret = sdma_check_progress(sde, wait, tx, submit_count > 0); 2536 if (ret == -EAGAIN) { 2537 ret = 0; 2538 goto retry; 2539 } 2540 sde->descq_full_count++; 2541 goto update_tail; 2542 } 2543 2544 static void sdma_process_event(struct sdma_engine *sde, enum sdma_events event) 2545 { 2546 unsigned long flags; 2547 2548 spin_lock_irqsave(&sde->tail_lock, flags); 2549 write_seqlock(&sde->head_lock); 2550 2551 __sdma_process_event(sde, event); 2552 2553 if (sde->state.current_state == sdma_state_s99_running) 2554 sdma_desc_avail(sde, sdma_descq_freecnt(sde)); 2555 2556 write_sequnlock(&sde->head_lock); 2557 spin_unlock_irqrestore(&sde->tail_lock, flags); 2558 } 2559 2560 static void __sdma_process_event(struct sdma_engine *sde, 2561 enum sdma_events event) 2562 { 2563 struct sdma_state *ss = &sde->state; 2564 int need_progress = 0; 2565 2566 /* CONFIG SDMA temporary */ 2567 #ifdef CONFIG_SDMA_VERBOSITY 2568 dd_dev_err(sde->dd, "CONFIG SDMA(%u) [%s] %s\n", sde->this_idx, 2569 sdma_state_names[ss->current_state], 2570 sdma_event_names[event]); 2571 #endif 2572 2573 switch (ss->current_state) { 2574 case sdma_state_s00_hw_down: 2575 switch (event) { 2576 case sdma_event_e00_go_hw_down: 2577 break; 2578 case sdma_event_e30_go_running: 2579 /* 2580 * If down, but running requested (usually result 2581 * of link up, then we need to start up. 2582 * This can happen when hw down is requested while 2583 * bringing the link up with traffic active on 2584 * 7220, e.g. 2585 */ 2586 ss->go_s99_running = 1; 2587 /* fall through -- and start dma engine */ 2588 case sdma_event_e10_go_hw_start: 2589 /* This reference means the state machine is started */ 2590 sdma_get(&sde->state); 2591 sdma_set_state(sde, 2592 sdma_state_s10_hw_start_up_halt_wait); 2593 break; 2594 case sdma_event_e15_hw_halt_done: 2595 break; 2596 case sdma_event_e25_hw_clean_up_done: 2597 break; 2598 case sdma_event_e40_sw_cleaned: 2599 sdma_sw_tear_down(sde); 2600 break; 2601 case sdma_event_e50_hw_cleaned: 2602 break; 2603 case sdma_event_e60_hw_halted: 2604 break; 2605 case sdma_event_e70_go_idle: 2606 break; 2607 case sdma_event_e80_hw_freeze: 2608 break; 2609 case sdma_event_e81_hw_frozen: 2610 break; 2611 case sdma_event_e82_hw_unfreeze: 2612 break; 2613 case sdma_event_e85_link_down: 2614 break; 2615 case sdma_event_e90_sw_halted: 2616 break; 2617 } 2618 break; 2619 2620 case sdma_state_s10_hw_start_up_halt_wait: 2621 switch (event) { 2622 case sdma_event_e00_go_hw_down: 2623 sdma_set_state(sde, sdma_state_s00_hw_down); 2624 sdma_sw_tear_down(sde); 2625 break; 2626 case sdma_event_e10_go_hw_start: 2627 break; 2628 case sdma_event_e15_hw_halt_done: 2629 sdma_set_state(sde, 2630 sdma_state_s15_hw_start_up_clean_wait); 2631 sdma_start_hw_clean_up(sde); 2632 break; 2633 case sdma_event_e25_hw_clean_up_done: 2634 break; 2635 case sdma_event_e30_go_running: 2636 ss->go_s99_running = 1; 2637 break; 2638 case sdma_event_e40_sw_cleaned: 2639 break; 2640 case sdma_event_e50_hw_cleaned: 2641 break; 2642 case sdma_event_e60_hw_halted: 2643 schedule_work(&sde->err_halt_worker); 2644 break; 2645 case sdma_event_e70_go_idle: 2646 ss->go_s99_running = 0; 2647 break; 2648 case sdma_event_e80_hw_freeze: 2649 break; 2650 case sdma_event_e81_hw_frozen: 2651 break; 2652 case sdma_event_e82_hw_unfreeze: 2653 break; 2654 case sdma_event_e85_link_down: 2655 break; 2656 case sdma_event_e90_sw_halted: 2657 break; 2658 } 2659 break; 2660 2661 case sdma_state_s15_hw_start_up_clean_wait: 2662 switch (event) { 2663 case sdma_event_e00_go_hw_down: 2664 sdma_set_state(sde, sdma_state_s00_hw_down); 2665 sdma_sw_tear_down(sde); 2666 break; 2667 case sdma_event_e10_go_hw_start: 2668 break; 2669 case sdma_event_e15_hw_halt_done: 2670 break; 2671 case sdma_event_e25_hw_clean_up_done: 2672 sdma_hw_start_up(sde); 2673 sdma_set_state(sde, ss->go_s99_running ? 2674 sdma_state_s99_running : 2675 sdma_state_s20_idle); 2676 break; 2677 case sdma_event_e30_go_running: 2678 ss->go_s99_running = 1; 2679 break; 2680 case sdma_event_e40_sw_cleaned: 2681 break; 2682 case sdma_event_e50_hw_cleaned: 2683 break; 2684 case sdma_event_e60_hw_halted: 2685 break; 2686 case sdma_event_e70_go_idle: 2687 ss->go_s99_running = 0; 2688 break; 2689 case sdma_event_e80_hw_freeze: 2690 break; 2691 case sdma_event_e81_hw_frozen: 2692 break; 2693 case sdma_event_e82_hw_unfreeze: 2694 break; 2695 case sdma_event_e85_link_down: 2696 break; 2697 case sdma_event_e90_sw_halted: 2698 break; 2699 } 2700 break; 2701 2702 case sdma_state_s20_idle: 2703 switch (event) { 2704 case sdma_event_e00_go_hw_down: 2705 sdma_set_state(sde, sdma_state_s00_hw_down); 2706 sdma_sw_tear_down(sde); 2707 break; 2708 case sdma_event_e10_go_hw_start: 2709 break; 2710 case sdma_event_e15_hw_halt_done: 2711 break; 2712 case sdma_event_e25_hw_clean_up_done: 2713 break; 2714 case sdma_event_e30_go_running: 2715 sdma_set_state(sde, sdma_state_s99_running); 2716 ss->go_s99_running = 1; 2717 break; 2718 case sdma_event_e40_sw_cleaned: 2719 break; 2720 case sdma_event_e50_hw_cleaned: 2721 break; 2722 case sdma_event_e60_hw_halted: 2723 sdma_set_state(sde, sdma_state_s50_hw_halt_wait); 2724 schedule_work(&sde->err_halt_worker); 2725 break; 2726 case sdma_event_e70_go_idle: 2727 break; 2728 case sdma_event_e85_link_down: 2729 /* fall through */ 2730 case sdma_event_e80_hw_freeze: 2731 sdma_set_state(sde, sdma_state_s80_hw_freeze); 2732 atomic_dec(&sde->dd->sdma_unfreeze_count); 2733 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq); 2734 break; 2735 case sdma_event_e81_hw_frozen: 2736 break; 2737 case sdma_event_e82_hw_unfreeze: 2738 break; 2739 case sdma_event_e90_sw_halted: 2740 break; 2741 } 2742 break; 2743 2744 case sdma_state_s30_sw_clean_up_wait: 2745 switch (event) { 2746 case sdma_event_e00_go_hw_down: 2747 sdma_set_state(sde, sdma_state_s00_hw_down); 2748 break; 2749 case sdma_event_e10_go_hw_start: 2750 break; 2751 case sdma_event_e15_hw_halt_done: 2752 break; 2753 case sdma_event_e25_hw_clean_up_done: 2754 break; 2755 case sdma_event_e30_go_running: 2756 ss->go_s99_running = 1; 2757 break; 2758 case sdma_event_e40_sw_cleaned: 2759 sdma_set_state(sde, sdma_state_s40_hw_clean_up_wait); 2760 sdma_start_hw_clean_up(sde); 2761 break; 2762 case sdma_event_e50_hw_cleaned: 2763 break; 2764 case sdma_event_e60_hw_halted: 2765 break; 2766 case sdma_event_e70_go_idle: 2767 ss->go_s99_running = 0; 2768 break; 2769 case sdma_event_e80_hw_freeze: 2770 break; 2771 case sdma_event_e81_hw_frozen: 2772 break; 2773 case sdma_event_e82_hw_unfreeze: 2774 break; 2775 case sdma_event_e85_link_down: 2776 ss->go_s99_running = 0; 2777 break; 2778 case sdma_event_e90_sw_halted: 2779 break; 2780 } 2781 break; 2782 2783 case sdma_state_s40_hw_clean_up_wait: 2784 switch (event) { 2785 case sdma_event_e00_go_hw_down: 2786 sdma_set_state(sde, sdma_state_s00_hw_down); 2787 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2788 break; 2789 case sdma_event_e10_go_hw_start: 2790 break; 2791 case sdma_event_e15_hw_halt_done: 2792 break; 2793 case sdma_event_e25_hw_clean_up_done: 2794 sdma_hw_start_up(sde); 2795 sdma_set_state(sde, ss->go_s99_running ? 2796 sdma_state_s99_running : 2797 sdma_state_s20_idle); 2798 break; 2799 case sdma_event_e30_go_running: 2800 ss->go_s99_running = 1; 2801 break; 2802 case sdma_event_e40_sw_cleaned: 2803 break; 2804 case sdma_event_e50_hw_cleaned: 2805 break; 2806 case sdma_event_e60_hw_halted: 2807 break; 2808 case sdma_event_e70_go_idle: 2809 ss->go_s99_running = 0; 2810 break; 2811 case sdma_event_e80_hw_freeze: 2812 break; 2813 case sdma_event_e81_hw_frozen: 2814 break; 2815 case sdma_event_e82_hw_unfreeze: 2816 break; 2817 case sdma_event_e85_link_down: 2818 ss->go_s99_running = 0; 2819 break; 2820 case sdma_event_e90_sw_halted: 2821 break; 2822 } 2823 break; 2824 2825 case sdma_state_s50_hw_halt_wait: 2826 switch (event) { 2827 case sdma_event_e00_go_hw_down: 2828 sdma_set_state(sde, sdma_state_s00_hw_down); 2829 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2830 break; 2831 case sdma_event_e10_go_hw_start: 2832 break; 2833 case sdma_event_e15_hw_halt_done: 2834 sdma_set_state(sde, sdma_state_s30_sw_clean_up_wait); 2835 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2836 break; 2837 case sdma_event_e25_hw_clean_up_done: 2838 break; 2839 case sdma_event_e30_go_running: 2840 ss->go_s99_running = 1; 2841 break; 2842 case sdma_event_e40_sw_cleaned: 2843 break; 2844 case sdma_event_e50_hw_cleaned: 2845 break; 2846 case sdma_event_e60_hw_halted: 2847 schedule_work(&sde->err_halt_worker); 2848 break; 2849 case sdma_event_e70_go_idle: 2850 ss->go_s99_running = 0; 2851 break; 2852 case sdma_event_e80_hw_freeze: 2853 break; 2854 case sdma_event_e81_hw_frozen: 2855 break; 2856 case sdma_event_e82_hw_unfreeze: 2857 break; 2858 case sdma_event_e85_link_down: 2859 ss->go_s99_running = 0; 2860 break; 2861 case sdma_event_e90_sw_halted: 2862 break; 2863 } 2864 break; 2865 2866 case sdma_state_s60_idle_halt_wait: 2867 switch (event) { 2868 case sdma_event_e00_go_hw_down: 2869 sdma_set_state(sde, sdma_state_s00_hw_down); 2870 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2871 break; 2872 case sdma_event_e10_go_hw_start: 2873 break; 2874 case sdma_event_e15_hw_halt_done: 2875 sdma_set_state(sde, sdma_state_s30_sw_clean_up_wait); 2876 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2877 break; 2878 case sdma_event_e25_hw_clean_up_done: 2879 break; 2880 case sdma_event_e30_go_running: 2881 ss->go_s99_running = 1; 2882 break; 2883 case sdma_event_e40_sw_cleaned: 2884 break; 2885 case sdma_event_e50_hw_cleaned: 2886 break; 2887 case sdma_event_e60_hw_halted: 2888 schedule_work(&sde->err_halt_worker); 2889 break; 2890 case sdma_event_e70_go_idle: 2891 ss->go_s99_running = 0; 2892 break; 2893 case sdma_event_e80_hw_freeze: 2894 break; 2895 case sdma_event_e81_hw_frozen: 2896 break; 2897 case sdma_event_e82_hw_unfreeze: 2898 break; 2899 case sdma_event_e85_link_down: 2900 break; 2901 case sdma_event_e90_sw_halted: 2902 break; 2903 } 2904 break; 2905 2906 case sdma_state_s80_hw_freeze: 2907 switch (event) { 2908 case sdma_event_e00_go_hw_down: 2909 sdma_set_state(sde, sdma_state_s00_hw_down); 2910 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2911 break; 2912 case sdma_event_e10_go_hw_start: 2913 break; 2914 case sdma_event_e15_hw_halt_done: 2915 break; 2916 case sdma_event_e25_hw_clean_up_done: 2917 break; 2918 case sdma_event_e30_go_running: 2919 ss->go_s99_running = 1; 2920 break; 2921 case sdma_event_e40_sw_cleaned: 2922 break; 2923 case sdma_event_e50_hw_cleaned: 2924 break; 2925 case sdma_event_e60_hw_halted: 2926 break; 2927 case sdma_event_e70_go_idle: 2928 ss->go_s99_running = 0; 2929 break; 2930 case sdma_event_e80_hw_freeze: 2931 break; 2932 case sdma_event_e81_hw_frozen: 2933 sdma_set_state(sde, sdma_state_s82_freeze_sw_clean); 2934 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2935 break; 2936 case sdma_event_e82_hw_unfreeze: 2937 break; 2938 case sdma_event_e85_link_down: 2939 break; 2940 case sdma_event_e90_sw_halted: 2941 break; 2942 } 2943 break; 2944 2945 case sdma_state_s82_freeze_sw_clean: 2946 switch (event) { 2947 case sdma_event_e00_go_hw_down: 2948 sdma_set_state(sde, sdma_state_s00_hw_down); 2949 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2950 break; 2951 case sdma_event_e10_go_hw_start: 2952 break; 2953 case sdma_event_e15_hw_halt_done: 2954 break; 2955 case sdma_event_e25_hw_clean_up_done: 2956 break; 2957 case sdma_event_e30_go_running: 2958 ss->go_s99_running = 1; 2959 break; 2960 case sdma_event_e40_sw_cleaned: 2961 /* notify caller this engine is done cleaning */ 2962 atomic_dec(&sde->dd->sdma_unfreeze_count); 2963 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq); 2964 break; 2965 case sdma_event_e50_hw_cleaned: 2966 break; 2967 case sdma_event_e60_hw_halted: 2968 break; 2969 case sdma_event_e70_go_idle: 2970 ss->go_s99_running = 0; 2971 break; 2972 case sdma_event_e80_hw_freeze: 2973 break; 2974 case sdma_event_e81_hw_frozen: 2975 break; 2976 case sdma_event_e82_hw_unfreeze: 2977 sdma_hw_start_up(sde); 2978 sdma_set_state(sde, ss->go_s99_running ? 2979 sdma_state_s99_running : 2980 sdma_state_s20_idle); 2981 break; 2982 case sdma_event_e85_link_down: 2983 break; 2984 case sdma_event_e90_sw_halted: 2985 break; 2986 } 2987 break; 2988 2989 case sdma_state_s99_running: 2990 switch (event) { 2991 case sdma_event_e00_go_hw_down: 2992 sdma_set_state(sde, sdma_state_s00_hw_down); 2993 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task); 2994 break; 2995 case sdma_event_e10_go_hw_start: 2996 break; 2997 case sdma_event_e15_hw_halt_done: 2998 break; 2999 case sdma_event_e25_hw_clean_up_done: 3000 break; 3001 case sdma_event_e30_go_running: 3002 break; 3003 case sdma_event_e40_sw_cleaned: 3004 break; 3005 case sdma_event_e50_hw_cleaned: 3006 break; 3007 case sdma_event_e60_hw_halted: 3008 need_progress = 1; 3009 sdma_err_progress_check_schedule(sde); 3010 /* fall through */ 3011 case sdma_event_e90_sw_halted: 3012 /* 3013 * SW initiated halt does not perform engines 3014 * progress check 3015 */ 3016 sdma_set_state(sde, sdma_state_s50_hw_halt_wait); 3017 schedule_work(&sde->err_halt_worker); 3018 break; 3019 case sdma_event_e70_go_idle: 3020 sdma_set_state(sde, sdma_state_s60_idle_halt_wait); 3021 break; 3022 case sdma_event_e85_link_down: 3023 ss->go_s99_running = 0; 3024 /* fall through */ 3025 case sdma_event_e80_hw_freeze: 3026 sdma_set_state(sde, sdma_state_s80_hw_freeze); 3027 atomic_dec(&sde->dd->sdma_unfreeze_count); 3028 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq); 3029 break; 3030 case sdma_event_e81_hw_frozen: 3031 break; 3032 case sdma_event_e82_hw_unfreeze: 3033 break; 3034 } 3035 break; 3036 } 3037 3038 ss->last_event = event; 3039 if (need_progress) 3040 sdma_make_progress(sde, 0); 3041 } 3042 3043 /* 3044 * _extend_sdma_tx_descs() - helper to extend txreq 3045 * 3046 * This is called once the initial nominal allocation 3047 * of descriptors in the sdma_txreq is exhausted. 3048 * 3049 * The code will bump the allocation up to the max 3050 * of MAX_DESC (64) descriptors. There doesn't seem 3051 * much point in an interim step. The last descriptor 3052 * is reserved for coalesce buffer in order to support 3053 * cases where input packet has >MAX_DESC iovecs. 3054 * 3055 */ 3056 static int _extend_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx) 3057 { 3058 int i; 3059 3060 /* Handle last descriptor */ 3061 if (unlikely((tx->num_desc == (MAX_DESC - 1)))) { 3062 /* if tlen is 0, it is for padding, release last descriptor */ 3063 if (!tx->tlen) { 3064 tx->desc_limit = MAX_DESC; 3065 } else if (!tx->coalesce_buf) { 3066 /* allocate coalesce buffer with space for padding */ 3067 tx->coalesce_buf = kmalloc(tx->tlen + sizeof(u32), 3068 GFP_ATOMIC); 3069 if (!tx->coalesce_buf) 3070 goto enomem; 3071 tx->coalesce_idx = 0; 3072 } 3073 return 0; 3074 } 3075 3076 if (unlikely(tx->num_desc == MAX_DESC)) 3077 goto enomem; 3078 3079 tx->descp = kmalloc_array( 3080 MAX_DESC, 3081 sizeof(struct sdma_desc), 3082 GFP_ATOMIC); 3083 if (!tx->descp) 3084 goto enomem; 3085 3086 /* reserve last descriptor for coalescing */ 3087 tx->desc_limit = MAX_DESC - 1; 3088 /* copy ones already built */ 3089 for (i = 0; i < tx->num_desc; i++) 3090 tx->descp[i] = tx->descs[i]; 3091 return 0; 3092 enomem: 3093 __sdma_txclean(dd, tx); 3094 return -ENOMEM; 3095 } 3096 3097 /* 3098 * ext_coal_sdma_tx_descs() - extend or coalesce sdma tx descriptors 3099 * 3100 * This is called once the initial nominal allocation of descriptors 3101 * in the sdma_txreq is exhausted. 3102 * 3103 * This function calls _extend_sdma_tx_descs to extend or allocate 3104 * coalesce buffer. If there is a allocated coalesce buffer, it will 3105 * copy the input packet data into the coalesce buffer. It also adds 3106 * coalesce buffer descriptor once when whole packet is received. 3107 * 3108 * Return: 3109 * <0 - error 3110 * 0 - coalescing, don't populate descriptor 3111 * 1 - continue with populating descriptor 3112 */ 3113 int ext_coal_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx, 3114 int type, void *kvaddr, struct page *page, 3115 unsigned long offset, u16 len) 3116 { 3117 int pad_len, rval; 3118 dma_addr_t addr; 3119 3120 rval = _extend_sdma_tx_descs(dd, tx); 3121 if (rval) { 3122 __sdma_txclean(dd, tx); 3123 return rval; 3124 } 3125 3126 /* If coalesce buffer is allocated, copy data into it */ 3127 if (tx->coalesce_buf) { 3128 if (type == SDMA_MAP_NONE) { 3129 __sdma_txclean(dd, tx); 3130 return -EINVAL; 3131 } 3132 3133 if (type == SDMA_MAP_PAGE) { 3134 kvaddr = kmap(page); 3135 kvaddr += offset; 3136 } else if (WARN_ON(!kvaddr)) { 3137 __sdma_txclean(dd, tx); 3138 return -EINVAL; 3139 } 3140 3141 memcpy(tx->coalesce_buf + tx->coalesce_idx, kvaddr, len); 3142 tx->coalesce_idx += len; 3143 if (type == SDMA_MAP_PAGE) 3144 kunmap(page); 3145 3146 /* If there is more data, return */ 3147 if (tx->tlen - tx->coalesce_idx) 3148 return 0; 3149 3150 /* Whole packet is received; add any padding */ 3151 pad_len = tx->packet_len & (sizeof(u32) - 1); 3152 if (pad_len) { 3153 pad_len = sizeof(u32) - pad_len; 3154 memset(tx->coalesce_buf + tx->coalesce_idx, 0, pad_len); 3155 /* padding is taken care of for coalescing case */ 3156 tx->packet_len += pad_len; 3157 tx->tlen += pad_len; 3158 } 3159 3160 /* dma map the coalesce buffer */ 3161 addr = dma_map_single(&dd->pcidev->dev, 3162 tx->coalesce_buf, 3163 tx->tlen, 3164 DMA_TO_DEVICE); 3165 3166 if (unlikely(dma_mapping_error(&dd->pcidev->dev, addr))) { 3167 __sdma_txclean(dd, tx); 3168 return -ENOSPC; 3169 } 3170 3171 /* Add descriptor for coalesce buffer */ 3172 tx->desc_limit = MAX_DESC; 3173 return _sdma_txadd_daddr(dd, SDMA_MAP_SINGLE, tx, 3174 addr, tx->tlen); 3175 } 3176 3177 return 1; 3178 } 3179 3180 /* Update sdes when the lmc changes */ 3181 void sdma_update_lmc(struct hfi1_devdata *dd, u64 mask, u32 lid) 3182 { 3183 struct sdma_engine *sde; 3184 int i; 3185 u64 sreg; 3186 3187 sreg = ((mask & SD(CHECK_SLID_MASK_MASK)) << 3188 SD(CHECK_SLID_MASK_SHIFT)) | 3189 (((lid & mask) & SD(CHECK_SLID_VALUE_MASK)) << 3190 SD(CHECK_SLID_VALUE_SHIFT)); 3191 3192 for (i = 0; i < dd->num_sdma; i++) { 3193 hfi1_cdbg(LINKVERB, "SendDmaEngine[%d].SLID_CHECK = 0x%x", 3194 i, (u32)sreg); 3195 sde = &dd->per_sdma[i]; 3196 write_sde_csr(sde, SD(CHECK_SLID), sreg); 3197 } 3198 } 3199 3200 /* tx not dword sized - pad */ 3201 int _pad_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx) 3202 { 3203 int rval = 0; 3204 3205 tx->num_desc++; 3206 if ((unlikely(tx->num_desc == tx->desc_limit))) { 3207 rval = _extend_sdma_tx_descs(dd, tx); 3208 if (rval) { 3209 __sdma_txclean(dd, tx); 3210 return rval; 3211 } 3212 } 3213 /* finish the one just added */ 3214 make_tx_sdma_desc( 3215 tx, 3216 SDMA_MAP_NONE, 3217 dd->sdma_pad_phys, 3218 sizeof(u32) - (tx->packet_len & (sizeof(u32) - 1))); 3219 _sdma_close_tx(dd, tx); 3220 return rval; 3221 } 3222 3223 /* 3224 * Add ahg to the sdma_txreq 3225 * 3226 * The logic will consume up to 3 3227 * descriptors at the beginning of 3228 * sdma_txreq. 3229 */ 3230 void _sdma_txreq_ahgadd( 3231 struct sdma_txreq *tx, 3232 u8 num_ahg, 3233 u8 ahg_entry, 3234 u32 *ahg, 3235 u8 ahg_hlen) 3236 { 3237 u32 i, shift = 0, desc = 0; 3238 u8 mode; 3239 3240 WARN_ON_ONCE(num_ahg > 9 || (ahg_hlen & 3) || ahg_hlen == 4); 3241 /* compute mode */ 3242 if (num_ahg == 1) 3243 mode = SDMA_AHG_APPLY_UPDATE1; 3244 else if (num_ahg <= 5) 3245 mode = SDMA_AHG_APPLY_UPDATE2; 3246 else 3247 mode = SDMA_AHG_APPLY_UPDATE3; 3248 tx->num_desc++; 3249 /* initialize to consumed descriptors to zero */ 3250 switch (mode) { 3251 case SDMA_AHG_APPLY_UPDATE3: 3252 tx->num_desc++; 3253 tx->descs[2].qw[0] = 0; 3254 tx->descs[2].qw[1] = 0; 3255 /* FALLTHROUGH */ 3256 case SDMA_AHG_APPLY_UPDATE2: 3257 tx->num_desc++; 3258 tx->descs[1].qw[0] = 0; 3259 tx->descs[1].qw[1] = 0; 3260 break; 3261 } 3262 ahg_hlen >>= 2; 3263 tx->descs[0].qw[1] |= 3264 (((u64)ahg_entry & SDMA_DESC1_HEADER_INDEX_MASK) 3265 << SDMA_DESC1_HEADER_INDEX_SHIFT) | 3266 (((u64)ahg_hlen & SDMA_DESC1_HEADER_DWS_MASK) 3267 << SDMA_DESC1_HEADER_DWS_SHIFT) | 3268 (((u64)mode & SDMA_DESC1_HEADER_MODE_MASK) 3269 << SDMA_DESC1_HEADER_MODE_SHIFT) | 3270 (((u64)ahg[0] & SDMA_DESC1_HEADER_UPDATE1_MASK) 3271 << SDMA_DESC1_HEADER_UPDATE1_SHIFT); 3272 for (i = 0; i < (num_ahg - 1); i++) { 3273 if (!shift && !(i & 2)) 3274 desc++; 3275 tx->descs[desc].qw[!!(i & 2)] |= 3276 (((u64)ahg[i + 1]) 3277 << shift); 3278 shift = (shift + 32) & 63; 3279 } 3280 } 3281 3282 /** 3283 * sdma_ahg_alloc - allocate an AHG entry 3284 * @sde: engine to allocate from 3285 * 3286 * Return: 3287 * 0-31 when successful, -EOPNOTSUPP if AHG is not enabled, 3288 * -ENOSPC if an entry is not available 3289 */ 3290 int sdma_ahg_alloc(struct sdma_engine *sde) 3291 { 3292 int nr; 3293 int oldbit; 3294 3295 if (!sde) { 3296 trace_hfi1_ahg_allocate(sde, -EINVAL); 3297 return -EINVAL; 3298 } 3299 while (1) { 3300 nr = ffz(READ_ONCE(sde->ahg_bits)); 3301 if (nr > 31) { 3302 trace_hfi1_ahg_allocate(sde, -ENOSPC); 3303 return -ENOSPC; 3304 } 3305 oldbit = test_and_set_bit(nr, &sde->ahg_bits); 3306 if (!oldbit) 3307 break; 3308 cpu_relax(); 3309 } 3310 trace_hfi1_ahg_allocate(sde, nr); 3311 return nr; 3312 } 3313 3314 /** 3315 * sdma_ahg_free - free an AHG entry 3316 * @sde: engine to return AHG entry 3317 * @ahg_index: index to free 3318 * 3319 * This routine frees the indicate AHG entry. 3320 */ 3321 void sdma_ahg_free(struct sdma_engine *sde, int ahg_index) 3322 { 3323 if (!sde) 3324 return; 3325 trace_hfi1_ahg_deallocate(sde, ahg_index); 3326 if (ahg_index < 0 || ahg_index > 31) 3327 return; 3328 clear_bit(ahg_index, &sde->ahg_bits); 3329 } 3330 3331 /* 3332 * SPC freeze handling for SDMA engines. Called when the driver knows 3333 * the SPC is going into a freeze but before the freeze is fully 3334 * settled. Generally an error interrupt. 3335 * 3336 * This event will pull the engine out of running so no more entries can be 3337 * added to the engine's queue. 3338 */ 3339 void sdma_freeze_notify(struct hfi1_devdata *dd, int link_down) 3340 { 3341 int i; 3342 enum sdma_events event = link_down ? sdma_event_e85_link_down : 3343 sdma_event_e80_hw_freeze; 3344 3345 /* set up the wait but do not wait here */ 3346 atomic_set(&dd->sdma_unfreeze_count, dd->num_sdma); 3347 3348 /* tell all engines to stop running and wait */ 3349 for (i = 0; i < dd->num_sdma; i++) 3350 sdma_process_event(&dd->per_sdma[i], event); 3351 3352 /* sdma_freeze() will wait for all engines to have stopped */ 3353 } 3354 3355 /* 3356 * SPC freeze handling for SDMA engines. Called when the driver knows 3357 * the SPC is fully frozen. 3358 */ 3359 void sdma_freeze(struct hfi1_devdata *dd) 3360 { 3361 int i; 3362 int ret; 3363 3364 /* 3365 * Make sure all engines have moved out of the running state before 3366 * continuing. 3367 */ 3368 ret = wait_event_interruptible(dd->sdma_unfreeze_wq, 3369 atomic_read(&dd->sdma_unfreeze_count) <= 3370 0); 3371 /* interrupted or count is negative, then unloading - just exit */ 3372 if (ret || atomic_read(&dd->sdma_unfreeze_count) < 0) 3373 return; 3374 3375 /* set up the count for the next wait */ 3376 atomic_set(&dd->sdma_unfreeze_count, dd->num_sdma); 3377 3378 /* tell all engines that the SPC is frozen, they can start cleaning */ 3379 for (i = 0; i < dd->num_sdma; i++) 3380 sdma_process_event(&dd->per_sdma[i], sdma_event_e81_hw_frozen); 3381 3382 /* 3383 * Wait for everyone to finish software clean before exiting. The 3384 * software clean will read engine CSRs, so must be completed before 3385 * the next step, which will clear the engine CSRs. 3386 */ 3387 (void)wait_event_interruptible(dd->sdma_unfreeze_wq, 3388 atomic_read(&dd->sdma_unfreeze_count) <= 0); 3389 /* no need to check results - done no matter what */ 3390 } 3391 3392 /* 3393 * SPC freeze handling for the SDMA engines. Called after the SPC is unfrozen. 3394 * 3395 * The SPC freeze acts like a SDMA halt and a hardware clean combined. All 3396 * that is left is a software clean. We could do it after the SPC is fully 3397 * frozen, but then we'd have to add another state to wait for the unfreeze. 3398 * Instead, just defer the software clean until the unfreeze step. 3399 */ 3400 void sdma_unfreeze(struct hfi1_devdata *dd) 3401 { 3402 int i; 3403 3404 /* tell all engines start freeze clean up */ 3405 for (i = 0; i < dd->num_sdma; i++) 3406 sdma_process_event(&dd->per_sdma[i], 3407 sdma_event_e82_hw_unfreeze); 3408 } 3409 3410 /** 3411 * _sdma_engine_progress_schedule() - schedule progress on engine 3412 * @sde: sdma_engine to schedule progress 3413 * 3414 */ 3415 void _sdma_engine_progress_schedule( 3416 struct sdma_engine *sde) 3417 { 3418 trace_hfi1_sdma_engine_progress(sde, sde->progress_mask); 3419 /* assume we have selected a good cpu */ 3420 write_csr(sde->dd, 3421 CCE_INT_FORCE + (8 * (IS_SDMA_START / 64)), 3422 sde->progress_mask); 3423 } 3424