1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Intel I/OAT DMA Linux driver 4 * Copyright(c) 2004 - 2015 Intel Corporation. 5 */ 6 7 /* 8 * This driver supports an Intel I/OAT DMA engine, which does asynchronous 9 * copy operations. 10 */ 11 12 #include <linux/init.h> 13 #include <linux/module.h> 14 #include <linux/slab.h> 15 #include <linux/pci.h> 16 #include <linux/interrupt.h> 17 #include <linux/dmaengine.h> 18 #include <linux/delay.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/workqueue.h> 21 #include <linux/prefetch.h> 22 #include <linux/sizes.h> 23 #include "dma.h" 24 #include "registers.h" 25 #include "hw.h" 26 27 #include "../dmaengine.h" 28 29 static int completion_timeout = 200; 30 module_param(completion_timeout, int, 0644); 31 MODULE_PARM_DESC(completion_timeout, 32 "set ioat completion timeout [msec] (default 200 [msec])"); 33 static int idle_timeout = 2000; 34 module_param(idle_timeout, int, 0644); 35 MODULE_PARM_DESC(idle_timeout, 36 "set ioat idle timeout [msec] (default 2000 [msec])"); 37 38 #define IDLE_TIMEOUT msecs_to_jiffies(idle_timeout) 39 #define COMPLETION_TIMEOUT msecs_to_jiffies(completion_timeout) 40 41 static char *chanerr_str[] = { 42 "DMA Transfer Source Address Error", 43 "DMA Transfer Destination Address Error", 44 "Next Descriptor Address Error", 45 "Descriptor Error", 46 "Chan Address Value Error", 47 "CHANCMD Error", 48 "Chipset Uncorrectable Data Integrity Error", 49 "DMA Uncorrectable Data Integrity Error", 50 "Read Data Error", 51 "Write Data Error", 52 "Descriptor Control Error", 53 "Descriptor Transfer Size Error", 54 "Completion Address Error", 55 "Interrupt Configuration Error", 56 "Super extended descriptor Address Error", 57 "Unaffiliated Error", 58 "CRC or XOR P Error", 59 "XOR Q Error", 60 "Descriptor Count Error", 61 "DIF All F detect Error", 62 "Guard Tag verification Error", 63 "Application Tag verification Error", 64 "Reference Tag verification Error", 65 "Bundle Bit Error", 66 "Result DIF All F detect Error", 67 "Result Guard Tag verification Error", 68 "Result Application Tag verification Error", 69 "Result Reference Tag verification Error", 70 }; 71 72 static void ioat_eh(struct ioatdma_chan *ioat_chan); 73 74 static void ioat_print_chanerrs(struct ioatdma_chan *ioat_chan, u32 chanerr) 75 { 76 int i; 77 78 for (i = 0; i < ARRAY_SIZE(chanerr_str); i++) { 79 if ((chanerr >> i) & 1) { 80 dev_err(to_dev(ioat_chan), "Err(%d): %s\n", 81 i, chanerr_str[i]); 82 } 83 } 84 } 85 86 /** 87 * ioat_dma_do_interrupt - handler used for single vector interrupt mode 88 * @irq: interrupt id 89 * @data: interrupt data 90 */ 91 irqreturn_t ioat_dma_do_interrupt(int irq, void *data) 92 { 93 struct ioatdma_device *instance = data; 94 struct ioatdma_chan *ioat_chan; 95 unsigned long attnstatus; 96 int bit; 97 u8 intrctrl; 98 99 intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET); 100 101 if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN)) 102 return IRQ_NONE; 103 104 if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) { 105 writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); 106 return IRQ_NONE; 107 } 108 109 attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); 110 for_each_set_bit(bit, &attnstatus, BITS_PER_LONG) { 111 ioat_chan = ioat_chan_by_index(instance, bit); 112 if (test_bit(IOAT_RUN, &ioat_chan->state)) 113 tasklet_schedule(&ioat_chan->cleanup_task); 114 } 115 116 writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); 117 return IRQ_HANDLED; 118 } 119 120 /** 121 * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode 122 * @irq: interrupt id 123 * @data: interrupt data 124 */ 125 irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) 126 { 127 struct ioatdma_chan *ioat_chan = data; 128 129 if (test_bit(IOAT_RUN, &ioat_chan->state)) 130 tasklet_schedule(&ioat_chan->cleanup_task); 131 132 return IRQ_HANDLED; 133 } 134 135 void ioat_stop(struct ioatdma_chan *ioat_chan) 136 { 137 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma; 138 struct pci_dev *pdev = ioat_dma->pdev; 139 int chan_id = chan_num(ioat_chan); 140 struct msix_entry *msix; 141 142 /* 1/ stop irq from firing tasklets 143 * 2/ stop the tasklet from re-arming irqs 144 */ 145 clear_bit(IOAT_RUN, &ioat_chan->state); 146 147 /* flush inflight interrupts */ 148 switch (ioat_dma->irq_mode) { 149 case IOAT_MSIX: 150 msix = &ioat_dma->msix_entries[chan_id]; 151 synchronize_irq(msix->vector); 152 break; 153 case IOAT_MSI: 154 case IOAT_INTX: 155 synchronize_irq(pdev->irq); 156 break; 157 default: 158 break; 159 } 160 161 /* flush inflight timers */ 162 del_timer_sync(&ioat_chan->timer); 163 164 /* flush inflight tasklet runs */ 165 tasklet_kill(&ioat_chan->cleanup_task); 166 167 /* final cleanup now that everything is quiesced and can't re-arm */ 168 ioat_cleanup_event(&ioat_chan->cleanup_task); 169 } 170 171 static void __ioat_issue_pending(struct ioatdma_chan *ioat_chan) 172 { 173 ioat_chan->dmacount += ioat_ring_pending(ioat_chan); 174 ioat_chan->issued = ioat_chan->head; 175 writew(ioat_chan->dmacount, 176 ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); 177 dev_dbg(to_dev(ioat_chan), 178 "%s: head: %#x tail: %#x issued: %#x count: %#x\n", 179 __func__, ioat_chan->head, ioat_chan->tail, 180 ioat_chan->issued, ioat_chan->dmacount); 181 } 182 183 void ioat_issue_pending(struct dma_chan *c) 184 { 185 struct ioatdma_chan *ioat_chan = to_ioat_chan(c); 186 187 if (ioat_ring_pending(ioat_chan)) { 188 spin_lock_bh(&ioat_chan->prep_lock); 189 __ioat_issue_pending(ioat_chan); 190 spin_unlock_bh(&ioat_chan->prep_lock); 191 } 192 } 193 194 /** 195 * ioat_update_pending - log pending descriptors 196 * @ioat_chan: ioat+ channel 197 * 198 * Check if the number of unsubmitted descriptors has exceeded the 199 * watermark. Called with prep_lock held 200 */ 201 static void ioat_update_pending(struct ioatdma_chan *ioat_chan) 202 { 203 if (ioat_ring_pending(ioat_chan) > ioat_pending_level) 204 __ioat_issue_pending(ioat_chan); 205 } 206 207 static void __ioat_start_null_desc(struct ioatdma_chan *ioat_chan) 208 { 209 struct ioat_ring_ent *desc; 210 struct ioat_dma_descriptor *hw; 211 212 if (ioat_ring_space(ioat_chan) < 1) { 213 dev_err(to_dev(ioat_chan), 214 "Unable to start null desc - ring full\n"); 215 return; 216 } 217 218 dev_dbg(to_dev(ioat_chan), 219 "%s: head: %#x tail: %#x issued: %#x\n", 220 __func__, ioat_chan->head, ioat_chan->tail, ioat_chan->issued); 221 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head); 222 223 hw = desc->hw; 224 hw->ctl = 0; 225 hw->ctl_f.null = 1; 226 hw->ctl_f.int_en = 1; 227 hw->ctl_f.compl_write = 1; 228 /* set size to non-zero value (channel returns error when size is 0) */ 229 hw->size = NULL_DESC_BUFFER_SIZE; 230 hw->src_addr = 0; 231 hw->dst_addr = 0; 232 async_tx_ack(&desc->txd); 233 ioat_set_chainaddr(ioat_chan, desc->txd.phys); 234 dump_desc_dbg(ioat_chan, desc); 235 /* make sure descriptors are written before we submit */ 236 wmb(); 237 ioat_chan->head += 1; 238 __ioat_issue_pending(ioat_chan); 239 } 240 241 void ioat_start_null_desc(struct ioatdma_chan *ioat_chan) 242 { 243 spin_lock_bh(&ioat_chan->prep_lock); 244 if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state)) 245 __ioat_start_null_desc(ioat_chan); 246 spin_unlock_bh(&ioat_chan->prep_lock); 247 } 248 249 static void __ioat_restart_chan(struct ioatdma_chan *ioat_chan) 250 { 251 /* set the tail to be re-issued */ 252 ioat_chan->issued = ioat_chan->tail; 253 ioat_chan->dmacount = 0; 254 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT); 255 256 dev_dbg(to_dev(ioat_chan), 257 "%s: head: %#x tail: %#x issued: %#x count: %#x\n", 258 __func__, ioat_chan->head, ioat_chan->tail, 259 ioat_chan->issued, ioat_chan->dmacount); 260 261 if (ioat_ring_pending(ioat_chan)) { 262 struct ioat_ring_ent *desc; 263 264 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail); 265 ioat_set_chainaddr(ioat_chan, desc->txd.phys); 266 __ioat_issue_pending(ioat_chan); 267 } else 268 __ioat_start_null_desc(ioat_chan); 269 } 270 271 static int ioat_quiesce(struct ioatdma_chan *ioat_chan, unsigned long tmo) 272 { 273 unsigned long end = jiffies + tmo; 274 int err = 0; 275 u32 status; 276 277 status = ioat_chansts(ioat_chan); 278 if (is_ioat_active(status) || is_ioat_idle(status)) 279 ioat_suspend(ioat_chan); 280 while (is_ioat_active(status) || is_ioat_idle(status)) { 281 if (tmo && time_after(jiffies, end)) { 282 err = -ETIMEDOUT; 283 break; 284 } 285 status = ioat_chansts(ioat_chan); 286 cpu_relax(); 287 } 288 289 return err; 290 } 291 292 static int ioat_reset_sync(struct ioatdma_chan *ioat_chan, unsigned long tmo) 293 { 294 unsigned long end = jiffies + tmo; 295 int err = 0; 296 297 ioat_reset(ioat_chan); 298 while (ioat_reset_pending(ioat_chan)) { 299 if (end && time_after(jiffies, end)) { 300 err = -ETIMEDOUT; 301 break; 302 } 303 cpu_relax(); 304 } 305 306 return err; 307 } 308 309 static dma_cookie_t ioat_tx_submit_unlock(struct dma_async_tx_descriptor *tx) 310 __releases(&ioat_chan->prep_lock) 311 { 312 struct dma_chan *c = tx->chan; 313 struct ioatdma_chan *ioat_chan = to_ioat_chan(c); 314 dma_cookie_t cookie; 315 316 cookie = dma_cookie_assign(tx); 317 dev_dbg(to_dev(ioat_chan), "%s: cookie: %d\n", __func__, cookie); 318 319 if (!test_and_set_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state)) 320 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT); 321 322 /* make descriptor updates visible before advancing ioat->head, 323 * this is purposefully not smp_wmb() since we are also 324 * publishing the descriptor updates to a dma device 325 */ 326 wmb(); 327 328 ioat_chan->head += ioat_chan->produce; 329 330 ioat_update_pending(ioat_chan); 331 spin_unlock_bh(&ioat_chan->prep_lock); 332 333 return cookie; 334 } 335 336 static struct ioat_ring_ent * 337 ioat_alloc_ring_ent(struct dma_chan *chan, int idx, gfp_t flags) 338 { 339 struct ioat_dma_descriptor *hw; 340 struct ioat_ring_ent *desc; 341 struct ioatdma_chan *ioat_chan = to_ioat_chan(chan); 342 int chunk; 343 dma_addr_t phys; 344 u8 *pos; 345 off_t offs; 346 347 chunk = idx / IOAT_DESCS_PER_CHUNK; 348 idx &= (IOAT_DESCS_PER_CHUNK - 1); 349 offs = idx * IOAT_DESC_SZ; 350 pos = (u8 *)ioat_chan->descs[chunk].virt + offs; 351 phys = ioat_chan->descs[chunk].hw + offs; 352 hw = (struct ioat_dma_descriptor *)pos; 353 memset(hw, 0, sizeof(*hw)); 354 355 desc = kmem_cache_zalloc(ioat_cache, flags); 356 if (!desc) 357 return NULL; 358 359 dma_async_tx_descriptor_init(&desc->txd, chan); 360 desc->txd.tx_submit = ioat_tx_submit_unlock; 361 desc->hw = hw; 362 desc->txd.phys = phys; 363 return desc; 364 } 365 366 void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan) 367 { 368 kmem_cache_free(ioat_cache, desc); 369 } 370 371 struct ioat_ring_ent ** 372 ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags) 373 { 374 struct ioatdma_chan *ioat_chan = to_ioat_chan(c); 375 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma; 376 struct ioat_ring_ent **ring; 377 int total_descs = 1 << order; 378 int i, chunks; 379 380 /* allocate the array to hold the software ring */ 381 ring = kcalloc(total_descs, sizeof(*ring), flags); 382 if (!ring) 383 return NULL; 384 385 chunks = (total_descs * IOAT_DESC_SZ) / IOAT_CHUNK_SIZE; 386 ioat_chan->desc_chunks = chunks; 387 388 for (i = 0; i < chunks; i++) { 389 struct ioat_descs *descs = &ioat_chan->descs[i]; 390 391 descs->virt = dma_alloc_coherent(to_dev(ioat_chan), 392 IOAT_CHUNK_SIZE, &descs->hw, flags); 393 if (!descs->virt) { 394 int idx; 395 396 for (idx = 0; idx < i; idx++) { 397 descs = &ioat_chan->descs[idx]; 398 dma_free_coherent(to_dev(ioat_chan), 399 IOAT_CHUNK_SIZE, 400 descs->virt, descs->hw); 401 descs->virt = NULL; 402 descs->hw = 0; 403 } 404 405 ioat_chan->desc_chunks = 0; 406 kfree(ring); 407 return NULL; 408 } 409 } 410 411 for (i = 0; i < total_descs; i++) { 412 ring[i] = ioat_alloc_ring_ent(c, i, flags); 413 if (!ring[i]) { 414 int idx; 415 416 while (i--) 417 ioat_free_ring_ent(ring[i], c); 418 419 for (idx = 0; idx < ioat_chan->desc_chunks; idx++) { 420 dma_free_coherent(to_dev(ioat_chan), 421 IOAT_CHUNK_SIZE, 422 ioat_chan->descs[idx].virt, 423 ioat_chan->descs[idx].hw); 424 ioat_chan->descs[idx].virt = NULL; 425 ioat_chan->descs[idx].hw = 0; 426 } 427 428 ioat_chan->desc_chunks = 0; 429 kfree(ring); 430 return NULL; 431 } 432 set_desc_id(ring[i], i); 433 } 434 435 /* link descs */ 436 for (i = 0; i < total_descs-1; i++) { 437 struct ioat_ring_ent *next = ring[i+1]; 438 struct ioat_dma_descriptor *hw = ring[i]->hw; 439 440 hw->next = next->txd.phys; 441 } 442 ring[i]->hw->next = ring[0]->txd.phys; 443 444 /* setup descriptor pre-fetching for v3.4 */ 445 if (ioat_dma->cap & IOAT_CAP_DPS) { 446 u16 drsctl = IOAT_CHAN_DRSZ_2MB | IOAT_CHAN_DRS_EN; 447 448 if (chunks == 1) 449 drsctl |= IOAT_CHAN_DRS_AUTOWRAP; 450 451 writew(drsctl, ioat_chan->reg_base + IOAT_CHAN_DRSCTL_OFFSET); 452 453 } 454 455 return ring; 456 } 457 458 /** 459 * ioat_check_space_lock - verify space and grab ring producer lock 460 * @ioat_chan: ioat,3 channel (ring) to operate on 461 * @num_descs: allocation length 462 */ 463 int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs) 464 __acquires(&ioat_chan->prep_lock) 465 { 466 spin_lock_bh(&ioat_chan->prep_lock); 467 /* never allow the last descriptor to be consumed, we need at 468 * least one free at all times to allow for on-the-fly ring 469 * resizing. 470 */ 471 if (likely(ioat_ring_space(ioat_chan) > num_descs)) { 472 dev_dbg(to_dev(ioat_chan), "%s: num_descs: %d (%x:%x:%x)\n", 473 __func__, num_descs, ioat_chan->head, 474 ioat_chan->tail, ioat_chan->issued); 475 ioat_chan->produce = num_descs; 476 return 0; /* with ioat->prep_lock held */ 477 } 478 spin_unlock_bh(&ioat_chan->prep_lock); 479 480 dev_dbg_ratelimited(to_dev(ioat_chan), 481 "%s: ring full! num_descs: %d (%x:%x:%x)\n", 482 __func__, num_descs, ioat_chan->head, 483 ioat_chan->tail, ioat_chan->issued); 484 485 /* progress reclaim in the allocation failure case we may be 486 * called under bh_disabled so we need to trigger the timer 487 * event directly 488 */ 489 if (time_is_before_jiffies(ioat_chan->timer.expires) 490 && timer_pending(&ioat_chan->timer)) { 491 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT); 492 ioat_timer_event(&ioat_chan->timer); 493 } 494 495 return -ENOMEM; 496 } 497 498 static bool desc_has_ext(struct ioat_ring_ent *desc) 499 { 500 struct ioat_dma_descriptor *hw = desc->hw; 501 502 if (hw->ctl_f.op == IOAT_OP_XOR || 503 hw->ctl_f.op == IOAT_OP_XOR_VAL) { 504 struct ioat_xor_descriptor *xor = desc->xor; 505 506 if (src_cnt_to_sw(xor->ctl_f.src_cnt) > 5) 507 return true; 508 } else if (hw->ctl_f.op == IOAT_OP_PQ || 509 hw->ctl_f.op == IOAT_OP_PQ_VAL) { 510 struct ioat_pq_descriptor *pq = desc->pq; 511 512 if (src_cnt_to_sw(pq->ctl_f.src_cnt) > 3) 513 return true; 514 } 515 516 return false; 517 } 518 519 static void 520 ioat_free_sed(struct ioatdma_device *ioat_dma, struct ioat_sed_ent *sed) 521 { 522 if (!sed) 523 return; 524 525 dma_pool_free(ioat_dma->sed_hw_pool[sed->hw_pool], sed->hw, sed->dma); 526 kmem_cache_free(ioat_sed_cache, sed); 527 } 528 529 static u64 ioat_get_current_completion(struct ioatdma_chan *ioat_chan) 530 { 531 u64 phys_complete; 532 u64 completion; 533 534 completion = *ioat_chan->completion; 535 phys_complete = ioat_chansts_to_addr(completion); 536 537 dev_dbg(to_dev(ioat_chan), "%s: phys_complete: %#llx\n", __func__, 538 (unsigned long long) phys_complete); 539 540 return phys_complete; 541 } 542 543 static bool ioat_cleanup_preamble(struct ioatdma_chan *ioat_chan, 544 u64 *phys_complete) 545 { 546 *phys_complete = ioat_get_current_completion(ioat_chan); 547 if (*phys_complete == ioat_chan->last_completion) 548 return false; 549 550 clear_bit(IOAT_COMPLETION_ACK, &ioat_chan->state); 551 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT); 552 553 return true; 554 } 555 556 static void 557 desc_get_errstat(struct ioatdma_chan *ioat_chan, struct ioat_ring_ent *desc) 558 { 559 struct ioat_dma_descriptor *hw = desc->hw; 560 561 switch (hw->ctl_f.op) { 562 case IOAT_OP_PQ_VAL: 563 case IOAT_OP_PQ_VAL_16S: 564 { 565 struct ioat_pq_descriptor *pq = desc->pq; 566 567 /* check if there's error written */ 568 if (!pq->dwbes_f.wbes) 569 return; 570 571 /* need to set a chanerr var for checking to clear later */ 572 573 if (pq->dwbes_f.p_val_err) 574 *desc->result |= SUM_CHECK_P_RESULT; 575 576 if (pq->dwbes_f.q_val_err) 577 *desc->result |= SUM_CHECK_Q_RESULT; 578 579 return; 580 } 581 default: 582 return; 583 } 584 } 585 586 /** 587 * __ioat_cleanup - reclaim used descriptors 588 * @ioat_chan: channel (ring) to clean 589 * @phys_complete: zeroed (or not) completion address (from status) 590 */ 591 static void __ioat_cleanup(struct ioatdma_chan *ioat_chan, dma_addr_t phys_complete) 592 { 593 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma; 594 struct ioat_ring_ent *desc; 595 bool seen_current = false; 596 int idx = ioat_chan->tail, i; 597 u16 active; 598 599 dev_dbg(to_dev(ioat_chan), "%s: head: %#x tail: %#x issued: %#x\n", 600 __func__, ioat_chan->head, ioat_chan->tail, ioat_chan->issued); 601 602 /* 603 * At restart of the channel, the completion address and the 604 * channel status will be 0 due to starting a new chain. Since 605 * it's new chain and the first descriptor "fails", there is 606 * nothing to clean up. We do not want to reap the entire submitted 607 * chain due to this 0 address value and then BUG. 608 */ 609 if (!phys_complete) 610 return; 611 612 active = ioat_ring_active(ioat_chan); 613 for (i = 0; i < active && !seen_current; i++) { 614 struct dma_async_tx_descriptor *tx; 615 616 prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1)); 617 desc = ioat_get_ring_ent(ioat_chan, idx + i); 618 dump_desc_dbg(ioat_chan, desc); 619 620 /* set err stat if we are using dwbes */ 621 if (ioat_dma->cap & IOAT_CAP_DWBES) 622 desc_get_errstat(ioat_chan, desc); 623 624 tx = &desc->txd; 625 if (tx->cookie) { 626 dma_cookie_complete(tx); 627 dma_descriptor_unmap(tx); 628 dmaengine_desc_get_callback_invoke(tx, NULL); 629 tx->callback = NULL; 630 tx->callback_result = NULL; 631 } 632 633 if (tx->phys == phys_complete) 634 seen_current = true; 635 636 /* skip extended descriptors */ 637 if (desc_has_ext(desc)) { 638 BUG_ON(i + 1 >= active); 639 i++; 640 } 641 642 /* cleanup super extended descriptors */ 643 if (desc->sed) { 644 ioat_free_sed(ioat_dma, desc->sed); 645 desc->sed = NULL; 646 } 647 } 648 649 /* finish all descriptor reads before incrementing tail */ 650 smp_mb(); 651 ioat_chan->tail = idx + i; 652 /* no active descs have written a completion? */ 653 BUG_ON(active && !seen_current); 654 ioat_chan->last_completion = phys_complete; 655 656 if (active - i == 0) { 657 dev_dbg(to_dev(ioat_chan), "%s: cancel completion timeout\n", 658 __func__); 659 mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT); 660 } 661 662 /* microsecond delay by sysfs variable per pending descriptor */ 663 if (ioat_chan->intr_coalesce != ioat_chan->prev_intr_coalesce) { 664 writew(min((ioat_chan->intr_coalesce * (active - i)), 665 IOAT_INTRDELAY_MASK), 666 ioat_chan->ioat_dma->reg_base + IOAT_INTRDELAY_OFFSET); 667 ioat_chan->prev_intr_coalesce = ioat_chan->intr_coalesce; 668 } 669 } 670 671 static void ioat_cleanup(struct ioatdma_chan *ioat_chan) 672 { 673 u64 phys_complete; 674 675 spin_lock_bh(&ioat_chan->cleanup_lock); 676 677 if (ioat_cleanup_preamble(ioat_chan, &phys_complete)) 678 __ioat_cleanup(ioat_chan, phys_complete); 679 680 if (is_ioat_halted(*ioat_chan->completion)) { 681 u32 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 682 683 if (chanerr & 684 (IOAT_CHANERR_HANDLE_MASK | IOAT_CHANERR_RECOVER_MASK)) { 685 mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT); 686 ioat_eh(ioat_chan); 687 } 688 } 689 690 spin_unlock_bh(&ioat_chan->cleanup_lock); 691 } 692 693 void ioat_cleanup_event(struct tasklet_struct *t) 694 { 695 struct ioatdma_chan *ioat_chan = from_tasklet(ioat_chan, t, cleanup_task); 696 697 ioat_cleanup(ioat_chan); 698 if (!test_bit(IOAT_RUN, &ioat_chan->state)) 699 return; 700 writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET); 701 } 702 703 static void ioat_restart_channel(struct ioatdma_chan *ioat_chan) 704 { 705 u64 phys_complete; 706 707 /* set the completion address register again */ 708 writel(lower_32_bits(ioat_chan->completion_dma), 709 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); 710 writel(upper_32_bits(ioat_chan->completion_dma), 711 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); 712 713 ioat_quiesce(ioat_chan, 0); 714 if (ioat_cleanup_preamble(ioat_chan, &phys_complete)) 715 __ioat_cleanup(ioat_chan, phys_complete); 716 717 __ioat_restart_chan(ioat_chan); 718 } 719 720 721 static void ioat_abort_descs(struct ioatdma_chan *ioat_chan) 722 { 723 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma; 724 struct ioat_ring_ent *desc; 725 u16 active; 726 int idx = ioat_chan->tail, i; 727 728 /* 729 * We assume that the failed descriptor has been processed. 730 * Now we are just returning all the remaining submitted 731 * descriptors to abort. 732 */ 733 active = ioat_ring_active(ioat_chan); 734 735 /* we skip the failed descriptor that tail points to */ 736 for (i = 1; i < active; i++) { 737 struct dma_async_tx_descriptor *tx; 738 739 prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1)); 740 desc = ioat_get_ring_ent(ioat_chan, idx + i); 741 742 tx = &desc->txd; 743 if (tx->cookie) { 744 struct dmaengine_result res; 745 746 dma_cookie_complete(tx); 747 dma_descriptor_unmap(tx); 748 res.result = DMA_TRANS_ABORTED; 749 dmaengine_desc_get_callback_invoke(tx, &res); 750 tx->callback = NULL; 751 tx->callback_result = NULL; 752 } 753 754 /* skip extended descriptors */ 755 if (desc_has_ext(desc)) { 756 WARN_ON(i + 1 >= active); 757 i++; 758 } 759 760 /* cleanup super extended descriptors */ 761 if (desc->sed) { 762 ioat_free_sed(ioat_dma, desc->sed); 763 desc->sed = NULL; 764 } 765 } 766 767 smp_mb(); /* finish all descriptor reads before incrementing tail */ 768 ioat_chan->tail = idx + active; 769 770 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail); 771 ioat_chan->last_completion = *ioat_chan->completion = desc->txd.phys; 772 } 773 774 static void ioat_eh(struct ioatdma_chan *ioat_chan) 775 { 776 struct pci_dev *pdev = to_pdev(ioat_chan); 777 struct ioat_dma_descriptor *hw; 778 struct dma_async_tx_descriptor *tx; 779 u64 phys_complete; 780 struct ioat_ring_ent *desc; 781 u32 err_handled = 0; 782 u32 chanerr_int; 783 u32 chanerr; 784 bool abort = false; 785 struct dmaengine_result res; 786 787 /* cleanup so tail points to descriptor that caused the error */ 788 if (ioat_cleanup_preamble(ioat_chan, &phys_complete)) 789 __ioat_cleanup(ioat_chan, phys_complete); 790 791 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 792 pci_read_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, &chanerr_int); 793 794 dev_dbg(to_dev(ioat_chan), "%s: error = %x:%x\n", 795 __func__, chanerr, chanerr_int); 796 797 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail); 798 hw = desc->hw; 799 dump_desc_dbg(ioat_chan, desc); 800 801 switch (hw->ctl_f.op) { 802 case IOAT_OP_XOR_VAL: 803 if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) { 804 *desc->result |= SUM_CHECK_P_RESULT; 805 err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR; 806 } 807 break; 808 case IOAT_OP_PQ_VAL: 809 case IOAT_OP_PQ_VAL_16S: 810 if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) { 811 *desc->result |= SUM_CHECK_P_RESULT; 812 err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR; 813 } 814 if (chanerr & IOAT_CHANERR_XOR_Q_ERR) { 815 *desc->result |= SUM_CHECK_Q_RESULT; 816 err_handled |= IOAT_CHANERR_XOR_Q_ERR; 817 } 818 break; 819 } 820 821 if (chanerr & IOAT_CHANERR_RECOVER_MASK) { 822 if (chanerr & IOAT_CHANERR_READ_DATA_ERR) { 823 res.result = DMA_TRANS_READ_FAILED; 824 err_handled |= IOAT_CHANERR_READ_DATA_ERR; 825 } else if (chanerr & IOAT_CHANERR_WRITE_DATA_ERR) { 826 res.result = DMA_TRANS_WRITE_FAILED; 827 err_handled |= IOAT_CHANERR_WRITE_DATA_ERR; 828 } 829 830 abort = true; 831 } else 832 res.result = DMA_TRANS_NOERROR; 833 834 /* fault on unhandled error or spurious halt */ 835 if (chanerr ^ err_handled || chanerr == 0) { 836 dev_err(to_dev(ioat_chan), "%s: fatal error (%x:%x)\n", 837 __func__, chanerr, err_handled); 838 dev_err(to_dev(ioat_chan), "Errors handled:\n"); 839 ioat_print_chanerrs(ioat_chan, err_handled); 840 dev_err(to_dev(ioat_chan), "Errors not handled:\n"); 841 ioat_print_chanerrs(ioat_chan, (chanerr & ~err_handled)); 842 843 BUG(); 844 } 845 846 /* cleanup the faulty descriptor since we are continuing */ 847 tx = &desc->txd; 848 if (tx->cookie) { 849 dma_cookie_complete(tx); 850 dma_descriptor_unmap(tx); 851 dmaengine_desc_get_callback_invoke(tx, &res); 852 tx->callback = NULL; 853 tx->callback_result = NULL; 854 } 855 856 /* mark faulting descriptor as complete */ 857 *ioat_chan->completion = desc->txd.phys; 858 859 spin_lock_bh(&ioat_chan->prep_lock); 860 /* we need abort all descriptors */ 861 if (abort) { 862 ioat_abort_descs(ioat_chan); 863 /* clean up the channel, we could be in weird state */ 864 ioat_reset_hw(ioat_chan); 865 } 866 867 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 868 pci_write_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, chanerr_int); 869 870 ioat_restart_channel(ioat_chan); 871 spin_unlock_bh(&ioat_chan->prep_lock); 872 } 873 874 static void check_active(struct ioatdma_chan *ioat_chan) 875 { 876 if (ioat_ring_active(ioat_chan)) { 877 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT); 878 return; 879 } 880 881 if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state)) 882 mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT); 883 } 884 885 static void ioat_reboot_chan(struct ioatdma_chan *ioat_chan) 886 { 887 spin_lock_bh(&ioat_chan->prep_lock); 888 set_bit(IOAT_CHAN_DOWN, &ioat_chan->state); 889 spin_unlock_bh(&ioat_chan->prep_lock); 890 891 ioat_abort_descs(ioat_chan); 892 dev_warn(to_dev(ioat_chan), "Reset channel...\n"); 893 ioat_reset_hw(ioat_chan); 894 dev_warn(to_dev(ioat_chan), "Restart channel...\n"); 895 ioat_restart_channel(ioat_chan); 896 897 spin_lock_bh(&ioat_chan->prep_lock); 898 clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state); 899 spin_unlock_bh(&ioat_chan->prep_lock); 900 } 901 902 void ioat_timer_event(struct timer_list *t) 903 { 904 struct ioatdma_chan *ioat_chan = from_timer(ioat_chan, t, timer); 905 dma_addr_t phys_complete; 906 u64 status; 907 908 status = ioat_chansts(ioat_chan); 909 910 /* when halted due to errors check for channel 911 * programming errors before advancing the completion state 912 */ 913 if (is_ioat_halted(status)) { 914 u32 chanerr; 915 916 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 917 dev_err(to_dev(ioat_chan), "%s: Channel halted (%x)\n", 918 __func__, chanerr); 919 dev_err(to_dev(ioat_chan), "Errors:\n"); 920 ioat_print_chanerrs(ioat_chan, chanerr); 921 922 if (test_bit(IOAT_RUN, &ioat_chan->state)) { 923 spin_lock_bh(&ioat_chan->cleanup_lock); 924 ioat_reboot_chan(ioat_chan); 925 spin_unlock_bh(&ioat_chan->cleanup_lock); 926 } 927 928 return; 929 } 930 931 spin_lock_bh(&ioat_chan->cleanup_lock); 932 933 /* handle the no-actives case */ 934 if (!ioat_ring_active(ioat_chan)) { 935 spin_lock_bh(&ioat_chan->prep_lock); 936 check_active(ioat_chan); 937 spin_unlock_bh(&ioat_chan->prep_lock); 938 goto unlock_out; 939 } 940 941 /* handle the missed cleanup case */ 942 if (ioat_cleanup_preamble(ioat_chan, &phys_complete)) { 943 /* timer restarted in ioat_cleanup_preamble 944 * and IOAT_COMPLETION_ACK cleared 945 */ 946 __ioat_cleanup(ioat_chan, phys_complete); 947 goto unlock_out; 948 } 949 950 /* if we haven't made progress and we have already 951 * acknowledged a pending completion once, then be more 952 * forceful with a restart 953 */ 954 if (test_bit(IOAT_COMPLETION_ACK, &ioat_chan->state)) { 955 u32 chanerr; 956 957 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 958 dev_err(to_dev(ioat_chan), "CHANSTS: %#Lx CHANERR: %#x\n", 959 status, chanerr); 960 dev_err(to_dev(ioat_chan), "Errors:\n"); 961 ioat_print_chanerrs(ioat_chan, chanerr); 962 963 dev_dbg(to_dev(ioat_chan), "Active descriptors: %d\n", 964 ioat_ring_active(ioat_chan)); 965 966 ioat_reboot_chan(ioat_chan); 967 968 goto unlock_out; 969 } 970 971 /* handle missed issue pending case */ 972 if (ioat_ring_pending(ioat_chan)) { 973 dev_warn(to_dev(ioat_chan), 974 "Completion timeout with pending descriptors\n"); 975 spin_lock_bh(&ioat_chan->prep_lock); 976 __ioat_issue_pending(ioat_chan); 977 spin_unlock_bh(&ioat_chan->prep_lock); 978 } 979 980 set_bit(IOAT_COMPLETION_ACK, &ioat_chan->state); 981 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT); 982 unlock_out: 983 spin_unlock_bh(&ioat_chan->cleanup_lock); 984 } 985 986 enum dma_status 987 ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie, 988 struct dma_tx_state *txstate) 989 { 990 struct ioatdma_chan *ioat_chan = to_ioat_chan(c); 991 enum dma_status ret; 992 993 ret = dma_cookie_status(c, cookie, txstate); 994 if (ret == DMA_COMPLETE) 995 return ret; 996 997 ioat_cleanup(ioat_chan); 998 999 return dma_cookie_status(c, cookie, txstate); 1000 } 1001 1002 int ioat_reset_hw(struct ioatdma_chan *ioat_chan) 1003 { 1004 /* throw away whatever the channel was doing and get it 1005 * initialized, with ioat3 specific workarounds 1006 */ 1007 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma; 1008 struct pci_dev *pdev = ioat_dma->pdev; 1009 u32 chanerr; 1010 u16 dev_id; 1011 int err; 1012 1013 ioat_quiesce(ioat_chan, msecs_to_jiffies(100)); 1014 1015 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 1016 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 1017 1018 if (ioat_dma->version < IOAT_VER_3_3) { 1019 /* clear any pending errors */ 1020 err = pci_read_config_dword(pdev, 1021 IOAT_PCI_CHANERR_INT_OFFSET, &chanerr); 1022 if (err) { 1023 dev_err(&pdev->dev, 1024 "channel error register unreachable\n"); 1025 return err; 1026 } 1027 pci_write_config_dword(pdev, 1028 IOAT_PCI_CHANERR_INT_OFFSET, chanerr); 1029 1030 /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit 1031 * (workaround for spurious config parity error after restart) 1032 */ 1033 pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); 1034 if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) { 1035 pci_write_config_dword(pdev, 1036 IOAT_PCI_DMAUNCERRSTS_OFFSET, 1037 0x10); 1038 } 1039 } 1040 1041 if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) { 1042 ioat_dma->msixtba0 = readq(ioat_dma->reg_base + 0x1000); 1043 ioat_dma->msixdata0 = readq(ioat_dma->reg_base + 0x1008); 1044 ioat_dma->msixpba = readq(ioat_dma->reg_base + 0x1800); 1045 } 1046 1047 1048 err = ioat_reset_sync(ioat_chan, msecs_to_jiffies(200)); 1049 if (!err) { 1050 if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) { 1051 writeq(ioat_dma->msixtba0, ioat_dma->reg_base + 0x1000); 1052 writeq(ioat_dma->msixdata0, ioat_dma->reg_base + 0x1008); 1053 writeq(ioat_dma->msixpba, ioat_dma->reg_base + 0x1800); 1054 } 1055 } 1056 1057 if (err) 1058 dev_err(&pdev->dev, "Failed to reset: %d\n", err); 1059 1060 return err; 1061 } 1062