1 // SPDX-License-Identifier: GPL-2.0-only
3 * Intel I/OAT DMA Linux driver
4 * Copyright(c) 2004 - 2015 Intel Corporation.
8 * This driver supports an Intel I/OAT DMA engine, which does asynchronous
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>
24 #include "registers.h"
27 #include "../dmaengine.h"
29 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 int idle_timeout = 2000;
34 module_param(idle_timeout, int, 0644);
35 MODULE_PARM_DESC(idle_timeout,
36 "set ioat idel timeout [msec] (default 2000 [msec])");
38 #define IDLE_TIMEOUT msecs_to_jiffies(idle_timeout)
39 #define COMPLETION_TIMEOUT msecs_to_jiffies(completion_timeout)
41 static char *chanerr_str[] = {
42 "DMA Transfer Source Address Error",
43 "DMA Transfer Destination Address Error",
44 "Next Descriptor Address Error",
46 "Chan Address Value Error",
48 "Chipset Uncorrectable Data Integrity Error",
49 "DMA Uncorrectable Data Integrity Error",
52 "Descriptor Control Error",
53 "Descriptor Transfer Size Error",
54 "Completion Address Error",
55 "Interrupt Configuration Error",
56 "Super extended descriptor Address 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",
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",
72 static void ioat_eh(struct ioatdma_chan *ioat_chan);
74 static void ioat_print_chanerrs(struct ioatdma_chan *ioat_chan, u32 chanerr)
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",
87 * ioat_dma_do_interrupt - handler used for single vector interrupt mode
89 * @data: interrupt data
91 irqreturn_t ioat_dma_do_interrupt(int irq, void *data)
93 struct ioatdma_device *instance = data;
94 struct ioatdma_chan *ioat_chan;
95 unsigned long attnstatus;
99 intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET);
101 if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN))
104 if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) {
105 writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
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);
116 writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
121 * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode
123 * @data: interrupt data
125 irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data)
127 struct ioatdma_chan *ioat_chan = data;
129 if (test_bit(IOAT_RUN, &ioat_chan->state))
130 tasklet_schedule(&ioat_chan->cleanup_task);
135 void ioat_stop(struct ioatdma_chan *ioat_chan)
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;
142 /* 1/ stop irq from firing tasklets
143 * 2/ stop the tasklet from re-arming irqs
145 clear_bit(IOAT_RUN, &ioat_chan->state);
147 /* flush inflight interrupts */
148 switch (ioat_dma->irq_mode) {
150 msix = &ioat_dma->msix_entries[chan_id];
151 synchronize_irq(msix->vector);
155 synchronize_irq(pdev->irq);
161 /* flush inflight timers */
162 del_timer_sync(&ioat_chan->timer);
164 /* flush inflight tasklet runs */
165 tasklet_kill(&ioat_chan->cleanup_task);
167 /* final cleanup now that everything is quiesced and can't re-arm */
168 ioat_cleanup_event((unsigned long)&ioat_chan->dma_chan);
171 static void __ioat_issue_pending(struct ioatdma_chan *ioat_chan)
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);
183 void ioat_issue_pending(struct dma_chan *c)
185 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
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);
195 * ioat_update_pending - log pending descriptors
196 * @ioat: ioat+ channel
198 * Check if the number of unsubmitted descriptors has exceeded the
199 * watermark. Called with prep_lock held
201 static void ioat_update_pending(struct ioatdma_chan *ioat_chan)
203 if (ioat_ring_pending(ioat_chan) > ioat_pending_level)
204 __ioat_issue_pending(ioat_chan);
207 static void __ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
209 struct ioat_ring_ent *desc;
210 struct ioat_dma_descriptor *hw;
212 if (ioat_ring_space(ioat_chan) < 1) {
213 dev_err(to_dev(ioat_chan),
214 "Unable to start null desc - ring full\n");
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);
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;
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 */
237 ioat_chan->head += 1;
238 __ioat_issue_pending(ioat_chan);
241 void ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
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);
249 static void __ioat_restart_chan(struct ioatdma_chan *ioat_chan)
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);
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);
261 if (ioat_ring_pending(ioat_chan)) {
262 struct ioat_ring_ent *desc;
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);
268 __ioat_start_null_desc(ioat_chan);
271 static int ioat_quiesce(struct ioatdma_chan *ioat_chan, unsigned long tmo)
273 unsigned long end = jiffies + tmo;
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)) {
285 status = ioat_chansts(ioat_chan);
292 static int ioat_reset_sync(struct ioatdma_chan *ioat_chan, unsigned long tmo)
294 unsigned long end = jiffies + tmo;
297 ioat_reset(ioat_chan);
298 while (ioat_reset_pending(ioat_chan)) {
299 if (end && time_after(jiffies, end)) {
309 static dma_cookie_t ioat_tx_submit_unlock(struct dma_async_tx_descriptor *tx)
310 __releases(&ioat_chan->prep_lock)
312 struct dma_chan *c = tx->chan;
313 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
316 cookie = dma_cookie_assign(tx);
317 dev_dbg(to_dev(ioat_chan), "%s: cookie: %d\n", __func__, cookie);
319 if (!test_and_set_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state))
320 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
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
328 ioat_chan->head += ioat_chan->produce;
330 ioat_update_pending(ioat_chan);
331 spin_unlock_bh(&ioat_chan->prep_lock);
336 static struct ioat_ring_ent *
337 ioat_alloc_ring_ent(struct dma_chan *chan, int idx, gfp_t flags)
339 struct ioat_dma_descriptor *hw;
340 struct ioat_ring_ent *desc;
341 struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
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));
355 desc = kmem_cache_zalloc(ioat_cache, flags);
359 dma_async_tx_descriptor_init(&desc->txd, chan);
360 desc->txd.tx_submit = ioat_tx_submit_unlock;
362 desc->txd.phys = phys;
366 void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan)
368 kmem_cache_free(ioat_cache, desc);
371 struct ioat_ring_ent **
372 ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags)
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;
380 /* allocate the array to hold the software ring */
381 ring = kcalloc(total_descs, sizeof(*ring), flags);
385 chunks = (total_descs * IOAT_DESC_SZ) / IOAT_CHUNK_SIZE;
386 ioat_chan->desc_chunks = chunks;
388 for (i = 0; i < chunks; i++) {
389 struct ioat_descs *descs = &ioat_chan->descs[i];
391 descs->virt = dma_alloc_coherent(to_dev(ioat_chan),
392 SZ_2M, &descs->hw, flags);
396 for (idx = 0; idx < i; idx++) {
397 descs = &ioat_chan->descs[idx];
398 dma_free_coherent(to_dev(ioat_chan),
400 descs->virt, descs->hw);
405 ioat_chan->desc_chunks = 0;
411 for (i = 0; i < total_descs; i++) {
412 ring[i] = ioat_alloc_ring_ent(c, i, flags);
417 ioat_free_ring_ent(ring[i], c);
419 for (idx = 0; idx < ioat_chan->desc_chunks; idx++) {
420 dma_free_coherent(to_dev(ioat_chan),
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;
428 ioat_chan->desc_chunks = 0;
432 set_desc_id(ring[i], i);
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;
440 hw->next = next->txd.phys;
442 ring[i]->hw->next = ring[0]->txd.phys;
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;
449 drsctl |= IOAT_CHAN_DRS_AUTOWRAP;
451 writew(drsctl, ioat_chan->reg_base + IOAT_CHAN_DRSCTL_OFFSET);
459 * ioat_check_space_lock - verify space and grab ring producer lock
460 * @ioat: ioat,3 channel (ring) to operate on
461 * @num_descs: allocation length
463 int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs)
464 __acquires(&ioat_chan->prep_lock)
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
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 */
478 spin_unlock_bh(&ioat_chan->prep_lock);
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);
485 /* progress reclaim in the allocation failure case we may be
486 * called under bh_disabled so we need to trigger the timer
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);
498 static bool desc_has_ext(struct ioat_ring_ent *desc)
500 struct ioat_dma_descriptor *hw = desc->hw;
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;
506 if (src_cnt_to_sw(xor->ctl_f.src_cnt) > 5)
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;
512 if (src_cnt_to_sw(pq->ctl_f.src_cnt) > 3)
520 ioat_free_sed(struct ioatdma_device *ioat_dma, struct ioat_sed_ent *sed)
525 dma_pool_free(ioat_dma->sed_hw_pool[sed->hw_pool], sed->hw, sed->dma);
526 kmem_cache_free(ioat_sed_cache, sed);
529 static u64 ioat_get_current_completion(struct ioatdma_chan *ioat_chan)
534 completion = *ioat_chan->completion;
535 phys_complete = ioat_chansts_to_addr(completion);
537 dev_dbg(to_dev(ioat_chan), "%s: phys_complete: %#llx\n", __func__,
538 (unsigned long long) phys_complete);
540 return phys_complete;
543 static bool ioat_cleanup_preamble(struct ioatdma_chan *ioat_chan,
546 *phys_complete = ioat_get_current_completion(ioat_chan);
547 if (*phys_complete == ioat_chan->last_completion)
550 clear_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
551 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
557 desc_get_errstat(struct ioatdma_chan *ioat_chan, struct ioat_ring_ent *desc)
559 struct ioat_dma_descriptor *hw = desc->hw;
561 switch (hw->ctl_f.op) {
563 case IOAT_OP_PQ_VAL_16S:
565 struct ioat_pq_descriptor *pq = desc->pq;
567 /* check if there's error written */
568 if (!pq->dwbes_f.wbes)
571 /* need to set a chanerr var for checking to clear later */
573 if (pq->dwbes_f.p_val_err)
574 *desc->result |= SUM_CHECK_P_RESULT;
576 if (pq->dwbes_f.q_val_err)
577 *desc->result |= SUM_CHECK_Q_RESULT;
587 * __cleanup - reclaim used descriptors
588 * @ioat: channel (ring) to clean
590 static void __cleanup(struct ioatdma_chan *ioat_chan, dma_addr_t phys_complete)
592 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
593 struct ioat_ring_ent *desc;
594 bool seen_current = false;
595 int idx = ioat_chan->tail, i;
598 dev_dbg(to_dev(ioat_chan), "%s: head: %#x tail: %#x issued: %#x\n",
599 __func__, ioat_chan->head, ioat_chan->tail, ioat_chan->issued);
602 * At restart of the channel, the completion address and the
603 * channel status will be 0 due to starting a new chain. Since
604 * it's new chain and the first descriptor "fails", there is
605 * nothing to clean up. We do not want to reap the entire submitted
606 * chain due to this 0 address value and then BUG.
611 active = ioat_ring_active(ioat_chan);
612 for (i = 0; i < active && !seen_current; i++) {
613 struct dma_async_tx_descriptor *tx;
615 prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
616 desc = ioat_get_ring_ent(ioat_chan, idx + i);
617 dump_desc_dbg(ioat_chan, desc);
619 /* set err stat if we are using dwbes */
620 if (ioat_dma->cap & IOAT_CAP_DWBES)
621 desc_get_errstat(ioat_chan, desc);
625 dma_cookie_complete(tx);
626 dma_descriptor_unmap(tx);
627 dmaengine_desc_get_callback_invoke(tx, NULL);
629 tx->callback_result = NULL;
632 if (tx->phys == phys_complete)
635 /* skip extended descriptors */
636 if (desc_has_ext(desc)) {
637 BUG_ON(i + 1 >= active);
641 /* cleanup super extended descriptors */
643 ioat_free_sed(ioat_dma, desc->sed);
648 /* finish all descriptor reads before incrementing tail */
650 ioat_chan->tail = idx + i;
651 /* no active descs have written a completion? */
652 BUG_ON(active && !seen_current);
653 ioat_chan->last_completion = phys_complete;
655 if (active - i == 0) {
656 dev_dbg(to_dev(ioat_chan), "%s: cancel completion timeout\n",
658 mod_timer(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
661 /* microsecond delay by sysfs variable per pending descriptor */
662 if (ioat_chan->intr_coalesce != ioat_chan->prev_intr_coalesce) {
663 writew(min((ioat_chan->intr_coalesce * (active - i)),
664 IOAT_INTRDELAY_MASK),
665 ioat_chan->ioat_dma->reg_base + IOAT_INTRDELAY_OFFSET);
666 ioat_chan->prev_intr_coalesce = ioat_chan->intr_coalesce;
670 static void ioat_cleanup(struct ioatdma_chan *ioat_chan)
674 spin_lock_bh(&ioat_chan->cleanup_lock);
676 if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
677 __cleanup(ioat_chan, phys_complete);
679 if (is_ioat_halted(*ioat_chan->completion)) {
680 u32 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
683 (IOAT_CHANERR_HANDLE_MASK | IOAT_CHANERR_RECOVER_MASK)) {
684 mod_timer(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
689 spin_unlock_bh(&ioat_chan->cleanup_lock);
692 void ioat_cleanup_event(unsigned long data)
694 struct ioatdma_chan *ioat_chan = to_ioat_chan((void *)data);
696 ioat_cleanup(ioat_chan);
697 if (!test_bit(IOAT_RUN, &ioat_chan->state))
699 writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
702 static void ioat_restart_channel(struct ioatdma_chan *ioat_chan)
706 /* set the completion address register again */
707 writel(lower_32_bits(ioat_chan->completion_dma),
708 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
709 writel(upper_32_bits(ioat_chan->completion_dma),
710 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
712 ioat_quiesce(ioat_chan, 0);
713 if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
714 __cleanup(ioat_chan, phys_complete);
716 __ioat_restart_chan(ioat_chan);
720 static void ioat_abort_descs(struct ioatdma_chan *ioat_chan)
722 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
723 struct ioat_ring_ent *desc;
725 int idx = ioat_chan->tail, i;
728 * We assume that the failed descriptor has been processed.
729 * Now we are just returning all the remaining submitted
730 * descriptors to abort.
732 active = ioat_ring_active(ioat_chan);
734 /* we skip the failed descriptor that tail points to */
735 for (i = 1; i < active; i++) {
736 struct dma_async_tx_descriptor *tx;
738 prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
739 desc = ioat_get_ring_ent(ioat_chan, idx + i);
743 struct dmaengine_result res;
745 dma_cookie_complete(tx);
746 dma_descriptor_unmap(tx);
747 res.result = DMA_TRANS_ABORTED;
748 dmaengine_desc_get_callback_invoke(tx, &res);
750 tx->callback_result = NULL;
753 /* skip extended descriptors */
754 if (desc_has_ext(desc)) {
755 WARN_ON(i + 1 >= active);
759 /* cleanup super extended descriptors */
761 ioat_free_sed(ioat_dma, desc->sed);
766 smp_mb(); /* finish all descriptor reads before incrementing tail */
767 ioat_chan->tail = idx + active;
769 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
770 ioat_chan->last_completion = *ioat_chan->completion = desc->txd.phys;
773 static void ioat_eh(struct ioatdma_chan *ioat_chan)
775 struct pci_dev *pdev = to_pdev(ioat_chan);
776 struct ioat_dma_descriptor *hw;
777 struct dma_async_tx_descriptor *tx;
779 struct ioat_ring_ent *desc;
784 struct dmaengine_result res;
786 /* cleanup so tail points to descriptor that caused the error */
787 if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
788 __cleanup(ioat_chan, phys_complete);
790 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
791 pci_read_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, &chanerr_int);
793 dev_dbg(to_dev(ioat_chan), "%s: error = %x:%x\n",
794 __func__, chanerr, chanerr_int);
796 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
798 dump_desc_dbg(ioat_chan, desc);
800 switch (hw->ctl_f.op) {
801 case IOAT_OP_XOR_VAL:
802 if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) {
803 *desc->result |= SUM_CHECK_P_RESULT;
804 err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR;
808 case IOAT_OP_PQ_VAL_16S:
809 if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) {
810 *desc->result |= SUM_CHECK_P_RESULT;
811 err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR;
813 if (chanerr & IOAT_CHANERR_XOR_Q_ERR) {
814 *desc->result |= SUM_CHECK_Q_RESULT;
815 err_handled |= IOAT_CHANERR_XOR_Q_ERR;
820 if (chanerr & IOAT_CHANERR_RECOVER_MASK) {
821 if (chanerr & IOAT_CHANERR_READ_DATA_ERR) {
822 res.result = DMA_TRANS_READ_FAILED;
823 err_handled |= IOAT_CHANERR_READ_DATA_ERR;
824 } else if (chanerr & IOAT_CHANERR_WRITE_DATA_ERR) {
825 res.result = DMA_TRANS_WRITE_FAILED;
826 err_handled |= IOAT_CHANERR_WRITE_DATA_ERR;
831 res.result = DMA_TRANS_NOERROR;
833 /* fault on unhandled error or spurious halt */
834 if (chanerr ^ err_handled || chanerr == 0) {
835 dev_err(to_dev(ioat_chan), "%s: fatal error (%x:%x)\n",
836 __func__, chanerr, err_handled);
837 dev_err(to_dev(ioat_chan), "Errors handled:\n");
838 ioat_print_chanerrs(ioat_chan, err_handled);
839 dev_err(to_dev(ioat_chan), "Errors not handled:\n");
840 ioat_print_chanerrs(ioat_chan, (chanerr & ~err_handled));
845 /* cleanup the faulty descriptor since we are continuing */
848 dma_cookie_complete(tx);
849 dma_descriptor_unmap(tx);
850 dmaengine_desc_get_callback_invoke(tx, &res);
852 tx->callback_result = NULL;
855 /* mark faulting descriptor as complete */
856 *ioat_chan->completion = desc->txd.phys;
858 spin_lock_bh(&ioat_chan->prep_lock);
859 /* we need abort all descriptors */
861 ioat_abort_descs(ioat_chan);
862 /* clean up the channel, we could be in weird state */
863 ioat_reset_hw(ioat_chan);
866 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
867 pci_write_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, chanerr_int);
869 ioat_restart_channel(ioat_chan);
870 spin_unlock_bh(&ioat_chan->prep_lock);
873 static void check_active(struct ioatdma_chan *ioat_chan)
875 if (ioat_ring_active(ioat_chan)) {
876 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
880 if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state))
881 mod_timer(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
884 static void ioat_reboot_chan(struct ioatdma_chan *ioat_chan)
886 spin_lock_bh(&ioat_chan->prep_lock);
887 set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
888 spin_unlock_bh(&ioat_chan->prep_lock);
890 ioat_abort_descs(ioat_chan);
891 dev_warn(to_dev(ioat_chan), "Reset channel...\n");
892 ioat_reset_hw(ioat_chan);
893 dev_warn(to_dev(ioat_chan), "Restart channel...\n");
894 ioat_restart_channel(ioat_chan);
896 spin_lock_bh(&ioat_chan->prep_lock);
897 clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
898 spin_unlock_bh(&ioat_chan->prep_lock);
901 void ioat_timer_event(struct timer_list *t)
903 struct ioatdma_chan *ioat_chan = from_timer(ioat_chan, t, timer);
904 dma_addr_t phys_complete;
907 status = ioat_chansts(ioat_chan);
909 /* when halted due to errors check for channel
910 * programming errors before advancing the completion state
912 if (is_ioat_halted(status)) {
915 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
916 dev_err(to_dev(ioat_chan), "%s: Channel halted (%x)\n",
918 dev_err(to_dev(ioat_chan), "Errors:\n");
919 ioat_print_chanerrs(ioat_chan, chanerr);
921 if (test_bit(IOAT_RUN, &ioat_chan->state)) {
922 spin_lock_bh(&ioat_chan->cleanup_lock);
923 ioat_reboot_chan(ioat_chan);
924 spin_unlock_bh(&ioat_chan->cleanup_lock);
930 spin_lock_bh(&ioat_chan->cleanup_lock);
932 /* handle the no-actives case */
933 if (!ioat_ring_active(ioat_chan)) {
934 spin_lock_bh(&ioat_chan->prep_lock);
935 check_active(ioat_chan);
936 spin_unlock_bh(&ioat_chan->prep_lock);
940 /* handle the missed cleanup case */
941 if (ioat_cleanup_preamble(ioat_chan, &phys_complete)) {
942 /* timer restarted in ioat_cleanup_preamble
943 * and IOAT_COMPLETION_ACK cleared
945 __cleanup(ioat_chan, phys_complete);
949 /* if we haven't made progress and we have already
950 * acknowledged a pending completion once, then be more
951 * forceful with a restart
953 if (test_bit(IOAT_COMPLETION_ACK, &ioat_chan->state)) {
956 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
957 dev_err(to_dev(ioat_chan), "CHANSTS: %#Lx CHANERR: %#x\n",
959 dev_err(to_dev(ioat_chan), "Errors:\n");
960 ioat_print_chanerrs(ioat_chan, chanerr);
962 dev_dbg(to_dev(ioat_chan), "Active descriptors: %d\n",
963 ioat_ring_active(ioat_chan));
965 ioat_reboot_chan(ioat_chan);
970 /* handle missed issue pending case */
971 if (ioat_ring_pending(ioat_chan)) {
972 dev_warn(to_dev(ioat_chan),
973 "Completion timeout with pending descriptors\n");
974 spin_lock_bh(&ioat_chan->prep_lock);
975 __ioat_issue_pending(ioat_chan);
976 spin_unlock_bh(&ioat_chan->prep_lock);
979 set_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
980 mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
982 spin_unlock_bh(&ioat_chan->cleanup_lock);
986 ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
987 struct dma_tx_state *txstate)
989 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
992 ret = dma_cookie_status(c, cookie, txstate);
993 if (ret == DMA_COMPLETE)
996 ioat_cleanup(ioat_chan);
998 return dma_cookie_status(c, cookie, txstate);
1001 int ioat_reset_hw(struct ioatdma_chan *ioat_chan)
1003 /* throw away whatever the channel was doing and get it
1004 * initialized, with ioat3 specific workarounds
1006 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
1007 struct pci_dev *pdev = ioat_dma->pdev;
1012 ioat_quiesce(ioat_chan, msecs_to_jiffies(100));
1014 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1015 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1017 if (ioat_dma->version < IOAT_VER_3_3) {
1018 /* clear any pending errors */
1019 err = pci_read_config_dword(pdev,
1020 IOAT_PCI_CHANERR_INT_OFFSET, &chanerr);
1023 "channel error register unreachable\n");
1026 pci_write_config_dword(pdev,
1027 IOAT_PCI_CHANERR_INT_OFFSET, chanerr);
1029 /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit
1030 * (workaround for spurious config parity error after restart)
1032 pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id);
1033 if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) {
1034 pci_write_config_dword(pdev,
1035 IOAT_PCI_DMAUNCERRSTS_OFFSET,
1040 if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) {
1041 ioat_dma->msixtba0 = readq(ioat_dma->reg_base + 0x1000);
1042 ioat_dma->msixdata0 = readq(ioat_dma->reg_base + 0x1008);
1043 ioat_dma->msixpba = readq(ioat_dma->reg_base + 0x1800);
1047 err = ioat_reset_sync(ioat_chan, msecs_to_jiffies(200));
1049 if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) {
1050 writeq(ioat_dma->msixtba0, ioat_dma->reg_base + 0x1000);
1051 writeq(ioat_dma->msixdata0, ioat_dma->reg_base + 0x1008);
1052 writeq(ioat_dma->msixpba, ioat_dma->reg_base + 0x1800);
1057 dev_err(&pdev->dev, "Failed to reset: %d\n", err);