2 * Copyright(c) 2015, 2016 Intel Corporation.
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.
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.
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.
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
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34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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>
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
69 static uint sdma_descq_cnt = SDMA_DESCQ_CNT;
70 module_param(sdma_descq_cnt, uint, S_IRUGO);
71 MODULE_PARM_DESC(sdma_descq_cnt, "Number of SDMA descq entries");
73 static uint sdma_idle_cnt = 250;
74 module_param(sdma_idle_cnt, uint, S_IRUGO);
75 MODULE_PARM_DESC(sdma_idle_cnt, "sdma interrupt idle delay (ns,default 250)");
78 module_param_named(num_sdma, mod_num_sdma, uint, S_IRUGO);
79 MODULE_PARM_DESC(num_sdma, "Set max number SDMA engines to use");
81 static uint sdma_desct_intr = SDMA_DESC_INTR;
82 module_param_named(desct_intr, sdma_desct_intr, uint, S_IRUGO | S_IWUSR);
83 MODULE_PARM_DESC(desct_intr, "Number of SDMA descriptor before interrupt");
85 #define SDMA_WAIT_BATCH_SIZE 20
86 /* max wait time for a SDMA engine to indicate it has halted */
87 #define SDMA_ERR_HALT_TIMEOUT 10 /* ms */
88 /* all SDMA engine errors that cause a halt */
90 #define SD(name) SEND_DMA_##name
91 #define ALL_SDMA_ENG_HALT_ERRS \
92 (SD(ENG_ERR_STATUS_SDMA_WRONG_DW_ERR_SMASK) \
93 | SD(ENG_ERR_STATUS_SDMA_GEN_MISMATCH_ERR_SMASK) \
94 | SD(ENG_ERR_STATUS_SDMA_TOO_LONG_ERR_SMASK) \
95 | SD(ENG_ERR_STATUS_SDMA_TAIL_OUT_OF_BOUNDS_ERR_SMASK) \
96 | SD(ENG_ERR_STATUS_SDMA_FIRST_DESC_ERR_SMASK) \
97 | SD(ENG_ERR_STATUS_SDMA_MEM_READ_ERR_SMASK) \
98 | SD(ENG_ERR_STATUS_SDMA_HALT_ERR_SMASK) \
99 | SD(ENG_ERR_STATUS_SDMA_LENGTH_MISMATCH_ERR_SMASK) \
100 | SD(ENG_ERR_STATUS_SDMA_PACKET_DESC_OVERFLOW_ERR_SMASK) \
101 | SD(ENG_ERR_STATUS_SDMA_HEADER_SELECT_ERR_SMASK) \
102 | SD(ENG_ERR_STATUS_SDMA_HEADER_ADDRESS_ERR_SMASK) \
103 | SD(ENG_ERR_STATUS_SDMA_HEADER_LENGTH_ERR_SMASK) \
104 | SD(ENG_ERR_STATUS_SDMA_TIMEOUT_ERR_SMASK) \
105 | SD(ENG_ERR_STATUS_SDMA_DESC_TABLE_UNC_ERR_SMASK) \
106 | SD(ENG_ERR_STATUS_SDMA_ASSEMBLY_UNC_ERR_SMASK) \
107 | SD(ENG_ERR_STATUS_SDMA_PACKET_TRACKING_UNC_ERR_SMASK) \
108 | SD(ENG_ERR_STATUS_SDMA_HEADER_STORAGE_UNC_ERR_SMASK) \
109 | SD(ENG_ERR_STATUS_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_SMASK))
111 /* sdma_sendctrl operations */
112 #define SDMA_SENDCTRL_OP_ENABLE BIT(0)
113 #define SDMA_SENDCTRL_OP_INTENABLE BIT(1)
114 #define SDMA_SENDCTRL_OP_HALT BIT(2)
115 #define SDMA_SENDCTRL_OP_CLEANUP BIT(3)
117 /* handle long defines */
118 #define SDMA_EGRESS_PACKET_OCCUPANCY_SMASK \
119 SEND_EGRESS_SEND_DMA_STATUS_SDMA_EGRESS_PACKET_OCCUPANCY_SMASK
120 #define SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT \
121 SEND_EGRESS_SEND_DMA_STATUS_SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT
123 static const char * const sdma_state_names[] = {
124 [sdma_state_s00_hw_down] = "s00_HwDown",
125 [sdma_state_s10_hw_start_up_halt_wait] = "s10_HwStartUpHaltWait",
126 [sdma_state_s15_hw_start_up_clean_wait] = "s15_HwStartUpCleanWait",
127 [sdma_state_s20_idle] = "s20_Idle",
128 [sdma_state_s30_sw_clean_up_wait] = "s30_SwCleanUpWait",
129 [sdma_state_s40_hw_clean_up_wait] = "s40_HwCleanUpWait",
130 [sdma_state_s50_hw_halt_wait] = "s50_HwHaltWait",
131 [sdma_state_s60_idle_halt_wait] = "s60_IdleHaltWait",
132 [sdma_state_s80_hw_freeze] = "s80_HwFreeze",
133 [sdma_state_s82_freeze_sw_clean] = "s82_FreezeSwClean",
134 [sdma_state_s99_running] = "s99_Running",
137 #ifdef CONFIG_SDMA_VERBOSITY
138 static const char * const sdma_event_names[] = {
139 [sdma_event_e00_go_hw_down] = "e00_GoHwDown",
140 [sdma_event_e10_go_hw_start] = "e10_GoHwStart",
141 [sdma_event_e15_hw_halt_done] = "e15_HwHaltDone",
142 [sdma_event_e25_hw_clean_up_done] = "e25_HwCleanUpDone",
143 [sdma_event_e30_go_running] = "e30_GoRunning",
144 [sdma_event_e40_sw_cleaned] = "e40_SwCleaned",
145 [sdma_event_e50_hw_cleaned] = "e50_HwCleaned",
146 [sdma_event_e60_hw_halted] = "e60_HwHalted",
147 [sdma_event_e70_go_idle] = "e70_GoIdle",
148 [sdma_event_e80_hw_freeze] = "e80_HwFreeze",
149 [sdma_event_e81_hw_frozen] = "e81_HwFrozen",
150 [sdma_event_e82_hw_unfreeze] = "e82_HwUnfreeze",
151 [sdma_event_e85_link_down] = "e85_LinkDown",
152 [sdma_event_e90_sw_halted] = "e90_SwHalted",
156 static const struct sdma_set_state_action sdma_action_table[] = {
157 [sdma_state_s00_hw_down] = {
158 .go_s99_running_tofalse = 1,
164 [sdma_state_s10_hw_start_up_halt_wait] = {
170 [sdma_state_s15_hw_start_up_clean_wait] = {
176 [sdma_state_s20_idle] = {
182 [sdma_state_s30_sw_clean_up_wait] = {
188 [sdma_state_s40_hw_clean_up_wait] = {
194 [sdma_state_s50_hw_halt_wait] = {
200 [sdma_state_s60_idle_halt_wait] = {
201 .go_s99_running_tofalse = 1,
207 [sdma_state_s80_hw_freeze] = {
213 [sdma_state_s82_freeze_sw_clean] = {
219 [sdma_state_s99_running] = {
224 .go_s99_running_totrue = 1,
228 #define SDMA_TAIL_UPDATE_THRESH 0x1F
230 /* declare all statics here rather than keep sorting */
231 static void sdma_complete(struct kref *);
232 static void sdma_finalput(struct sdma_state *);
233 static void sdma_get(struct sdma_state *);
234 static void sdma_hw_clean_up_task(unsigned long);
235 static void sdma_put(struct sdma_state *);
236 static void sdma_set_state(struct sdma_engine *, enum sdma_states);
237 static void sdma_start_hw_clean_up(struct sdma_engine *);
238 static void sdma_sw_clean_up_task(unsigned long);
239 static void sdma_sendctrl(struct sdma_engine *, unsigned);
240 static void init_sdma_regs(struct sdma_engine *, u32, uint);
241 static void sdma_process_event(
242 struct sdma_engine *sde,
243 enum sdma_events event);
244 static void __sdma_process_event(
245 struct sdma_engine *sde,
246 enum sdma_events event);
247 static void dump_sdma_state(struct sdma_engine *sde);
248 static void sdma_make_progress(struct sdma_engine *sde, u64 status);
249 static void sdma_desc_avail(struct sdma_engine *sde, uint avail);
250 static void sdma_flush_descq(struct sdma_engine *sde);
253 * sdma_state_name() - return state string from enum
256 static const char *sdma_state_name(enum sdma_states state)
258 return sdma_state_names[state];
261 static void sdma_get(struct sdma_state *ss)
266 static void sdma_complete(struct kref *kref)
268 struct sdma_state *ss =
269 container_of(kref, struct sdma_state, kref);
274 static void sdma_put(struct sdma_state *ss)
276 kref_put(&ss->kref, sdma_complete);
279 static void sdma_finalput(struct sdma_state *ss)
282 wait_for_completion(&ss->comp);
285 static inline void write_sde_csr(
286 struct sdma_engine *sde,
290 write_kctxt_csr(sde->dd, sde->this_idx, offset0, value);
293 static inline u64 read_sde_csr(
294 struct sdma_engine *sde,
297 return read_kctxt_csr(sde->dd, sde->this_idx, offset0);
301 * sdma_wait_for_packet_egress() - wait for the VL FIFO occupancy for
302 * sdma engine 'sde' to drop to 0.
304 static void sdma_wait_for_packet_egress(struct sdma_engine *sde,
307 u64 off = 8 * sde->this_idx;
308 struct hfi1_devdata *dd = sde->dd;
315 reg = read_csr(dd, off + SEND_EGRESS_SEND_DMA_STATUS);
317 reg &= SDMA_EGRESS_PACKET_OCCUPANCY_SMASK;
318 reg >>= SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT;
321 /* counter is reest if accupancy count changes */
325 /* timed out - bounce the link */
326 dd_dev_err(dd, "%s: engine %u timeout waiting for packets to egress, remaining count %u, bouncing link\n",
327 __func__, sde->this_idx, (u32)reg);
328 queue_work(dd->pport->link_wq,
329 &dd->pport->link_bounce_work);
337 * sdma_wait() - wait for packet egress to complete for all SDMA engines,
338 * and pause for credit return.
340 void sdma_wait(struct hfi1_devdata *dd)
344 for (i = 0; i < dd->num_sdma; i++) {
345 struct sdma_engine *sde = &dd->per_sdma[i];
347 sdma_wait_for_packet_egress(sde, 0);
351 static inline void sdma_set_desc_cnt(struct sdma_engine *sde, unsigned cnt)
355 if (!(sde->dd->flags & HFI1_HAS_SDMA_TIMEOUT))
358 reg &= SD(DESC_CNT_CNT_MASK);
359 reg <<= SD(DESC_CNT_CNT_SHIFT);
360 write_sde_csr(sde, SD(DESC_CNT), reg);
363 static inline void complete_tx(struct sdma_engine *sde,
364 struct sdma_txreq *tx,
367 /* protect against complete modifying */
368 struct iowait *wait = tx->wait;
369 callback_t complete = tx->complete;
371 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
372 trace_hfi1_sdma_out_sn(sde, tx->sn);
373 if (WARN_ON_ONCE(sde->head_sn != tx->sn))
374 dd_dev_err(sde->dd, "expected %llu got %llu\n",
375 sde->head_sn, tx->sn);
378 __sdma_txclean(sde->dd, tx);
380 (*complete)(tx, res);
381 if (wait && iowait_sdma_dec(wait))
382 iowait_drain_wakeup(wait);
386 * Complete all the sdma requests with a SDMA_TXREQ_S_ABORTED status
388 * Depending on timing there can be txreqs in two places:
389 * - in the descq ring
390 * - in the flush list
392 * To avoid ordering issues the descq ring needs to be flushed
393 * first followed by the flush list.
395 * This routine is called from two places
396 * - From a work queue item
397 * - Directly from the state machine just before setting the
400 * Must be called with head_lock held
403 static void sdma_flush(struct sdma_engine *sde)
405 struct sdma_txreq *txp, *txp_next;
406 LIST_HEAD(flushlist);
409 /* flush from head to tail */
410 sdma_flush_descq(sde);
411 spin_lock_irqsave(&sde->flushlist_lock, flags);
412 /* copy flush list */
413 list_for_each_entry_safe(txp, txp_next, &sde->flushlist, list) {
414 list_del_init(&txp->list);
415 list_add_tail(&txp->list, &flushlist);
417 spin_unlock_irqrestore(&sde->flushlist_lock, flags);
418 /* flush from flush list */
419 list_for_each_entry_safe(txp, txp_next, &flushlist, list)
420 complete_tx(sde, txp, SDMA_TXREQ_S_ABORTED);
424 * Fields a work request for flushing the descq ring
427 * If the engine has been brought to running during
428 * the scheduling delay, the flush is ignored, assuming
429 * that the process of bringing the engine to running
430 * would have done this flush prior to going to running.
433 static void sdma_field_flush(struct work_struct *work)
436 struct sdma_engine *sde =
437 container_of(work, struct sdma_engine, flush_worker);
439 write_seqlock_irqsave(&sde->head_lock, flags);
440 if (!__sdma_running(sde))
442 write_sequnlock_irqrestore(&sde->head_lock, flags);
445 static void sdma_err_halt_wait(struct work_struct *work)
447 struct sdma_engine *sde = container_of(work, struct sdma_engine,
450 unsigned long timeout;
452 timeout = jiffies + msecs_to_jiffies(SDMA_ERR_HALT_TIMEOUT);
454 statuscsr = read_sde_csr(sde, SD(STATUS));
455 statuscsr &= SD(STATUS_ENG_HALTED_SMASK);
458 if (time_after(jiffies, timeout)) {
460 "SDMA engine %d - timeout waiting for engine to halt\n",
463 * Continue anyway. This could happen if there was
464 * an uncorrectable error in the wrong spot.
468 usleep_range(80, 120);
471 sdma_process_event(sde, sdma_event_e15_hw_halt_done);
474 static void sdma_err_progress_check_schedule(struct sdma_engine *sde)
476 if (!is_bx(sde->dd) && HFI1_CAP_IS_KSET(SDMA_AHG)) {
478 struct hfi1_devdata *dd = sde->dd;
480 for (index = 0; index < dd->num_sdma; index++) {
481 struct sdma_engine *curr_sdma = &dd->per_sdma[index];
483 if (curr_sdma != sde)
484 curr_sdma->progress_check_head =
485 curr_sdma->descq_head;
488 "SDMA engine %d - check scheduled\n",
490 mod_timer(&sde->err_progress_check_timer, jiffies + 10);
494 static void sdma_err_progress_check(struct timer_list *t)
497 struct sdma_engine *sde = from_timer(sde, t, err_progress_check_timer);
499 dd_dev_err(sde->dd, "SDE progress check event\n");
500 for (index = 0; index < sde->dd->num_sdma; index++) {
501 struct sdma_engine *curr_sde = &sde->dd->per_sdma[index];
504 /* check progress on each engine except the current one */
508 * We must lock interrupts when acquiring sde->lock,
509 * to avoid a deadlock if interrupt triggers and spins on
510 * the same lock on same CPU
512 spin_lock_irqsave(&curr_sde->tail_lock, flags);
513 write_seqlock(&curr_sde->head_lock);
515 /* skip non-running queues */
516 if (curr_sde->state.current_state != sdma_state_s99_running) {
517 write_sequnlock(&curr_sde->head_lock);
518 spin_unlock_irqrestore(&curr_sde->tail_lock, flags);
522 if ((curr_sde->descq_head != curr_sde->descq_tail) &&
523 (curr_sde->descq_head ==
524 curr_sde->progress_check_head))
525 __sdma_process_event(curr_sde,
526 sdma_event_e90_sw_halted);
527 write_sequnlock(&curr_sde->head_lock);
528 spin_unlock_irqrestore(&curr_sde->tail_lock, flags);
530 schedule_work(&sde->err_halt_worker);
533 static void sdma_hw_clean_up_task(unsigned long opaque)
535 struct sdma_engine *sde = (struct sdma_engine *)opaque;
539 #ifdef CONFIG_SDMA_VERBOSITY
540 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
541 sde->this_idx, slashstrip(__FILE__), __LINE__,
544 statuscsr = read_sde_csr(sde, SD(STATUS));
545 statuscsr &= SD(STATUS_ENG_CLEANED_UP_SMASK);
551 sdma_process_event(sde, sdma_event_e25_hw_clean_up_done);
554 static inline struct sdma_txreq *get_txhead(struct sdma_engine *sde)
556 return sde->tx_ring[sde->tx_head & sde->sdma_mask];
560 * flush ring for recovery
562 static void sdma_flush_descq(struct sdma_engine *sde)
566 struct sdma_txreq *txp = get_txhead(sde);
568 /* The reason for some of the complexity of this code is that
569 * not all descriptors have corresponding txps. So, we have to
570 * be able to skip over descs until we wander into the range of
571 * the next txp on the list.
573 head = sde->descq_head & sde->sdma_mask;
574 tail = sde->descq_tail & sde->sdma_mask;
575 while (head != tail) {
576 /* advance head, wrap if needed */
577 head = ++sde->descq_head & sde->sdma_mask;
578 /* if now past this txp's descs, do the callback */
579 if (txp && txp->next_descq_idx == head) {
580 /* remove from list */
581 sde->tx_ring[sde->tx_head++ & sde->sdma_mask] = NULL;
582 complete_tx(sde, txp, SDMA_TXREQ_S_ABORTED);
583 trace_hfi1_sdma_progress(sde, head, tail, txp);
584 txp = get_txhead(sde);
589 sdma_desc_avail(sde, sdma_descq_freecnt(sde));
592 static void sdma_sw_clean_up_task(unsigned long opaque)
594 struct sdma_engine *sde = (struct sdma_engine *)opaque;
597 spin_lock_irqsave(&sde->tail_lock, flags);
598 write_seqlock(&sde->head_lock);
601 * At this point, the following should always be true:
602 * - We are halted, so no more descriptors are getting retired.
603 * - We are not running, so no one is submitting new work.
604 * - Only we can send the e40_sw_cleaned, so we can't start
605 * running again until we say so. So, the active list and
606 * descq are ours to play with.
610 * In the error clean up sequence, software clean must be called
611 * before the hardware clean so we can use the hardware head in
612 * the progress routine. A hardware clean or SPC unfreeze will
613 * reset the hardware head.
615 * Process all retired requests. The progress routine will use the
616 * latest physical hardware head - we are not running so speed does
619 sdma_make_progress(sde, 0);
624 * Reset our notion of head and tail.
625 * Note that the HW registers have been reset via an earlier
630 sde->desc_avail = sdma_descq_freecnt(sde);
633 __sdma_process_event(sde, sdma_event_e40_sw_cleaned);
635 write_sequnlock(&sde->head_lock);
636 spin_unlock_irqrestore(&sde->tail_lock, flags);
639 static void sdma_sw_tear_down(struct sdma_engine *sde)
641 struct sdma_state *ss = &sde->state;
643 /* Releasing this reference means the state machine has stopped. */
646 /* stop waiting for all unfreeze events to complete */
647 atomic_set(&sde->dd->sdma_unfreeze_count, -1);
648 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
651 static void sdma_start_hw_clean_up(struct sdma_engine *sde)
653 tasklet_hi_schedule(&sde->sdma_hw_clean_up_task);
656 static void sdma_set_state(struct sdma_engine *sde,
657 enum sdma_states next_state)
659 struct sdma_state *ss = &sde->state;
660 const struct sdma_set_state_action *action = sdma_action_table;
663 trace_hfi1_sdma_state(
665 sdma_state_names[ss->current_state],
666 sdma_state_names[next_state]);
668 /* debugging bookkeeping */
669 ss->previous_state = ss->current_state;
670 ss->previous_op = ss->current_op;
671 ss->current_state = next_state;
673 if (ss->previous_state != sdma_state_s99_running &&
674 next_state == sdma_state_s99_running)
677 if (action[next_state].op_enable)
678 op |= SDMA_SENDCTRL_OP_ENABLE;
680 if (action[next_state].op_intenable)
681 op |= SDMA_SENDCTRL_OP_INTENABLE;
683 if (action[next_state].op_halt)
684 op |= SDMA_SENDCTRL_OP_HALT;
686 if (action[next_state].op_cleanup)
687 op |= SDMA_SENDCTRL_OP_CLEANUP;
689 if (action[next_state].go_s99_running_tofalse)
690 ss->go_s99_running = 0;
692 if (action[next_state].go_s99_running_totrue)
693 ss->go_s99_running = 1;
696 sdma_sendctrl(sde, ss->current_op);
700 * sdma_get_descq_cnt() - called when device probed
702 * Return a validated descq count.
704 * This is currently only used in the verbs initialization to build the tx
707 * This will probably be deleted in favor of a more scalable approach to
711 u16 sdma_get_descq_cnt(void)
713 u16 count = sdma_descq_cnt;
716 return SDMA_DESCQ_CNT;
717 /* count must be a power of 2 greater than 64 and less than
718 * 32768. Otherwise return default.
720 if (!is_power_of_2(count))
721 return SDMA_DESCQ_CNT;
722 if (count < 64 || count > 32768)
723 return SDMA_DESCQ_CNT;
728 * sdma_engine_get_vl() - return vl for a given sdma engine
731 * This function returns the vl mapped to a given engine, or an error if
732 * the mapping can't be found. The mapping fields are protected by RCU.
734 int sdma_engine_get_vl(struct sdma_engine *sde)
736 struct hfi1_devdata *dd = sde->dd;
737 struct sdma_vl_map *m;
740 if (sde->this_idx >= TXE_NUM_SDMA_ENGINES)
744 m = rcu_dereference(dd->sdma_map);
749 vl = m->engine_to_vl[sde->this_idx];
756 * sdma_select_engine_vl() - select sdma engine
758 * @selector: a spreading factor
762 * This function returns an engine based on the selector and a vl. The
763 * mapping fields are protected by RCU.
765 struct sdma_engine *sdma_select_engine_vl(
766 struct hfi1_devdata *dd,
770 struct sdma_vl_map *m;
771 struct sdma_map_elem *e;
772 struct sdma_engine *rval;
774 /* NOTE This should only happen if SC->VL changed after the initial
775 * checks on the QP/AH
776 * Default will return engine 0 below
784 m = rcu_dereference(dd->sdma_map);
787 return &dd->per_sdma[0];
789 e = m->map[vl & m->mask];
790 rval = e->sde[selector & e->mask];
794 rval = !rval ? &dd->per_sdma[0] : rval;
795 trace_hfi1_sdma_engine_select(dd, selector, vl, rval->this_idx);
800 * sdma_select_engine_sc() - select sdma engine
802 * @selector: a spreading factor
806 * This function returns an engine based on the selector and an sc.
808 struct sdma_engine *sdma_select_engine_sc(
809 struct hfi1_devdata *dd,
813 u8 vl = sc_to_vlt(dd, sc5);
815 return sdma_select_engine_vl(dd, selector, vl);
818 struct sdma_rht_map_elem {
821 struct sdma_engine *sde[0];
824 struct sdma_rht_node {
825 unsigned long cpu_id;
826 struct sdma_rht_map_elem *map[HFI1_MAX_VLS_SUPPORTED];
827 struct rhash_head node;
830 #define NR_CPUS_HINT 192
832 static const struct rhashtable_params sdma_rht_params = {
833 .nelem_hint = NR_CPUS_HINT,
834 .head_offset = offsetof(struct sdma_rht_node, node),
835 .key_offset = offsetof(struct sdma_rht_node, cpu_id),
836 .key_len = FIELD_SIZEOF(struct sdma_rht_node, cpu_id),
839 .automatic_shrinking = true,
843 * sdma_select_user_engine() - select sdma engine based on user setup
845 * @selector: a spreading factor
848 * This function returns an sdma engine for a user sdma request.
849 * User defined sdma engine affinity setting is honored when applicable,
850 * otherwise system default sdma engine mapping is used. To ensure correct
851 * ordering, the mapping from <selector, vl> to sde must remain unchanged.
853 struct sdma_engine *sdma_select_user_engine(struct hfi1_devdata *dd,
856 struct sdma_rht_node *rht_node;
857 struct sdma_engine *sde = NULL;
858 const struct cpumask *current_mask = ¤t->cpus_allowed;
859 unsigned long cpu_id;
862 * To ensure that always the same sdma engine(s) will be
863 * selected make sure the process is pinned to this CPU only.
865 if (cpumask_weight(current_mask) != 1)
868 cpu_id = smp_processor_id();
870 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpu_id,
873 if (rht_node && rht_node->map[vl]) {
874 struct sdma_rht_map_elem *map = rht_node->map[vl];
876 sde = map->sde[selector & map->mask];
884 return sdma_select_engine_vl(dd, selector, vl);
887 static void sdma_populate_sde_map(struct sdma_rht_map_elem *map)
891 for (i = 0; i < roundup_pow_of_two(map->ctr ? : 1) - map->ctr; i++)
892 map->sde[map->ctr + i] = map->sde[i];
895 static void sdma_cleanup_sde_map(struct sdma_rht_map_elem *map,
896 struct sdma_engine *sde)
900 /* only need to check the first ctr entries for a match */
901 for (i = 0; i < map->ctr; i++) {
902 if (map->sde[i] == sde) {
903 memmove(&map->sde[i], &map->sde[i + 1],
904 (map->ctr - i - 1) * sizeof(map->sde[0]));
906 pow = roundup_pow_of_two(map->ctr ? : 1);
908 sdma_populate_sde_map(map);
915 * Prevents concurrent reads and writes of the sdma engine cpu_mask
917 static DEFINE_MUTEX(process_to_sde_mutex);
919 ssize_t sdma_set_cpu_to_sde_map(struct sdma_engine *sde, const char *buf,
922 struct hfi1_devdata *dd = sde->dd;
923 cpumask_var_t mask, new_mask;
927 vl = sdma_engine_get_vl(sde);
928 if (unlikely(vl < 0))
931 ret = zalloc_cpumask_var(&mask, GFP_KERNEL);
935 ret = zalloc_cpumask_var(&new_mask, GFP_KERNEL);
937 free_cpumask_var(mask);
940 ret = cpulist_parse(buf, mask);
944 if (!cpumask_subset(mask, cpu_online_mask)) {
945 dd_dev_warn(sde->dd, "Invalid CPU mask\n");
950 sz = sizeof(struct sdma_rht_map_elem) +
951 (TXE_NUM_SDMA_ENGINES * sizeof(struct sdma_engine *));
953 mutex_lock(&process_to_sde_mutex);
955 for_each_cpu(cpu, mask) {
956 struct sdma_rht_node *rht_node;
958 /* Check if we have this already mapped */
959 if (cpumask_test_cpu(cpu, &sde->cpu_mask)) {
960 cpumask_set_cpu(cpu, new_mask);
964 if (vl >= ARRAY_SIZE(rht_node->map)) {
969 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpu,
972 rht_node = kzalloc(sizeof(*rht_node), GFP_KERNEL);
978 rht_node->map[vl] = kzalloc(sz, GFP_KERNEL);
979 if (!rht_node->map[vl]) {
984 rht_node->cpu_id = cpu;
985 rht_node->map[vl]->mask = 0;
986 rht_node->map[vl]->ctr = 1;
987 rht_node->map[vl]->sde[0] = sde;
989 ret = rhashtable_insert_fast(dd->sdma_rht,
993 kfree(rht_node->map[vl]);
995 dd_dev_err(sde->dd, "Failed to set process to sde affinity for cpu %lu\n",
1003 /* Add new user mappings */
1004 if (!rht_node->map[vl])
1005 rht_node->map[vl] = kzalloc(sz, GFP_KERNEL);
1007 if (!rht_node->map[vl]) {
1012 rht_node->map[vl]->ctr++;
1013 ctr = rht_node->map[vl]->ctr;
1014 rht_node->map[vl]->sde[ctr - 1] = sde;
1015 pow = roundup_pow_of_two(ctr);
1016 rht_node->map[vl]->mask = pow - 1;
1018 /* Populate the sde map table */
1019 sdma_populate_sde_map(rht_node->map[vl]);
1021 cpumask_set_cpu(cpu, new_mask);
1024 /* Clean up old mappings */
1025 for_each_cpu(cpu, cpu_online_mask) {
1026 struct sdma_rht_node *rht_node;
1028 /* Don't cleanup sdes that are set in the new mask */
1029 if (cpumask_test_cpu(cpu, mask))
1032 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpu,
1038 /* Remove mappings for old sde */
1039 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++)
1040 if (rht_node->map[i])
1041 sdma_cleanup_sde_map(rht_node->map[i],
1044 /* Free empty hash table entries */
1045 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) {
1046 if (!rht_node->map[i])
1049 if (rht_node->map[i]->ctr) {
1056 ret = rhashtable_remove_fast(dd->sdma_rht,
1061 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++)
1062 kfree(rht_node->map[i]);
1069 cpumask_copy(&sde->cpu_mask, new_mask);
1071 mutex_unlock(&process_to_sde_mutex);
1073 free_cpumask_var(mask);
1074 free_cpumask_var(new_mask);
1075 return ret ? : strnlen(buf, PAGE_SIZE);
1078 ssize_t sdma_get_cpu_to_sde_map(struct sdma_engine *sde, char *buf)
1080 mutex_lock(&process_to_sde_mutex);
1081 if (cpumask_empty(&sde->cpu_mask))
1082 snprintf(buf, PAGE_SIZE, "%s\n", "empty");
1084 cpumap_print_to_pagebuf(true, buf, &sde->cpu_mask);
1085 mutex_unlock(&process_to_sde_mutex);
1086 return strnlen(buf, PAGE_SIZE);
1089 static void sdma_rht_free(void *ptr, void *arg)
1091 struct sdma_rht_node *rht_node = ptr;
1094 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++)
1095 kfree(rht_node->map[i]);
1101 * sdma_seqfile_dump_cpu_list() - debugfs dump the cpu to sdma mappings
1106 * This routine dumps the process to sde mappings per cpu
1108 void sdma_seqfile_dump_cpu_list(struct seq_file *s,
1109 struct hfi1_devdata *dd,
1110 unsigned long cpuid)
1112 struct sdma_rht_node *rht_node;
1115 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpuid,
1120 seq_printf(s, "cpu%3lu: ", cpuid);
1121 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) {
1122 if (!rht_node->map[i] || !rht_node->map[i]->ctr)
1125 seq_printf(s, " vl%d: [", i);
1127 for (j = 0; j < rht_node->map[i]->ctr; j++) {
1128 if (!rht_node->map[i]->sde[j])
1134 seq_printf(s, " sdma%2d",
1135 rht_node->map[i]->sde[j]->this_idx);
1144 * Free the indicated map struct
1146 static void sdma_map_free(struct sdma_vl_map *m)
1150 for (i = 0; m && i < m->actual_vls; i++)
1156 * Handle RCU callback
1158 static void sdma_map_rcu_callback(struct rcu_head *list)
1160 struct sdma_vl_map *m = container_of(list, struct sdma_vl_map, list);
1166 * sdma_map_init - called when # vls change
1168 * @port: port number
1169 * @num_vls: number of vls
1170 * @vl_engines: per vl engine mapping (optional)
1172 * This routine changes the mapping based on the number of vls.
1174 * vl_engines is used to specify a non-uniform vl/engine loading. NULL
1175 * implies auto computing the loading and giving each VLs a uniform
1176 * distribution of engines per VL.
1178 * The auto algorithm computes the sde_per_vl and the number of extra
1179 * engines. Any extra engines are added from the last VL on down.
1181 * rcu locking is used here to control access to the mapping fields.
1183 * If either the num_vls or num_sdma are non-power of 2, the array sizes
1184 * in the struct sdma_vl_map and the struct sdma_map_elem are rounded
1185 * up to the next highest power of 2 and the first entry is reused
1186 * in a round robin fashion.
1188 * If an error occurs the map change is not done and the mapping is
1192 int sdma_map_init(struct hfi1_devdata *dd, u8 port, u8 num_vls, u8 *vl_engines)
1195 int extra, sde_per_vl;
1197 u8 lvl_engines[OPA_MAX_VLS];
1198 struct sdma_vl_map *oldmap, *newmap;
1200 if (!(dd->flags & HFI1_HAS_SEND_DMA))
1204 /* truncate divide */
1205 sde_per_vl = dd->num_sdma / num_vls;
1207 extra = dd->num_sdma % num_vls;
1208 vl_engines = lvl_engines;
1209 /* add extras from last vl down */
1210 for (i = num_vls - 1; i >= 0; i--, extra--)
1211 vl_engines[i] = sde_per_vl + (extra > 0 ? 1 : 0);
1215 sizeof(struct sdma_vl_map) +
1216 roundup_pow_of_two(num_vls) *
1217 sizeof(struct sdma_map_elem *),
1221 newmap->actual_vls = num_vls;
1222 newmap->vls = roundup_pow_of_two(num_vls);
1223 newmap->mask = (1 << ilog2(newmap->vls)) - 1;
1224 /* initialize back-map */
1225 for (i = 0; i < TXE_NUM_SDMA_ENGINES; i++)
1226 newmap->engine_to_vl[i] = -1;
1227 for (i = 0; i < newmap->vls; i++) {
1228 /* save for wrap around */
1229 int first_engine = engine;
1231 if (i < newmap->actual_vls) {
1232 int sz = roundup_pow_of_two(vl_engines[i]);
1234 /* only allocate once */
1235 newmap->map[i] = kzalloc(
1236 sizeof(struct sdma_map_elem) +
1237 sz * sizeof(struct sdma_engine *),
1239 if (!newmap->map[i])
1241 newmap->map[i]->mask = (1 << ilog2(sz)) - 1;
1242 /* assign engines */
1243 for (j = 0; j < sz; j++) {
1244 newmap->map[i]->sde[j] =
1245 &dd->per_sdma[engine];
1246 if (++engine >= first_engine + vl_engines[i])
1247 /* wrap back to first engine */
1248 engine = first_engine;
1250 /* assign back-map */
1251 for (j = 0; j < vl_engines[i]; j++)
1252 newmap->engine_to_vl[first_engine + j] = i;
1254 /* just re-use entry without allocating */
1255 newmap->map[i] = newmap->map[i % num_vls];
1257 engine = first_engine + vl_engines[i];
1259 /* newmap in hand, save old map */
1260 spin_lock_irq(&dd->sde_map_lock);
1261 oldmap = rcu_dereference_protected(dd->sdma_map,
1262 lockdep_is_held(&dd->sde_map_lock));
1264 /* publish newmap */
1265 rcu_assign_pointer(dd->sdma_map, newmap);
1267 spin_unlock_irq(&dd->sde_map_lock);
1268 /* success, free any old map after grace period */
1270 call_rcu(&oldmap->list, sdma_map_rcu_callback);
1273 /* free any partial allocation */
1274 sdma_map_free(newmap);
1279 * Clean up allocated memory.
1281 * This routine is can be called regardless of the success of sdma_init()
1284 static void sdma_clean(struct hfi1_devdata *dd, size_t num_engines)
1287 struct sdma_engine *sde;
1289 if (dd->sdma_pad_dma) {
1290 dma_free_coherent(&dd->pcidev->dev, 4,
1291 (void *)dd->sdma_pad_dma,
1293 dd->sdma_pad_dma = NULL;
1294 dd->sdma_pad_phys = 0;
1296 if (dd->sdma_heads_dma) {
1297 dma_free_coherent(&dd->pcidev->dev, dd->sdma_heads_size,
1298 (void *)dd->sdma_heads_dma,
1299 dd->sdma_heads_phys);
1300 dd->sdma_heads_dma = NULL;
1301 dd->sdma_heads_phys = 0;
1303 for (i = 0; dd->per_sdma && i < num_engines; ++i) {
1304 sde = &dd->per_sdma[i];
1306 sde->head_dma = NULL;
1312 sde->descq_cnt * sizeof(u64[2]),
1317 sde->descq_phys = 0;
1319 kvfree(sde->tx_ring);
1320 sde->tx_ring = NULL;
1322 spin_lock_irq(&dd->sde_map_lock);
1323 sdma_map_free(rcu_access_pointer(dd->sdma_map));
1324 RCU_INIT_POINTER(dd->sdma_map, NULL);
1325 spin_unlock_irq(&dd->sde_map_lock);
1327 kfree(dd->per_sdma);
1328 dd->per_sdma = NULL;
1331 rhashtable_free_and_destroy(dd->sdma_rht, sdma_rht_free, NULL);
1332 kfree(dd->sdma_rht);
1333 dd->sdma_rht = NULL;
1338 * sdma_init() - called when device probed
1340 * @port: port number (currently only zero)
1342 * Initializes each sde and its csrs.
1343 * Interrupts are not required to be enabled.
1346 * 0 - success, -errno on failure
1348 int sdma_init(struct hfi1_devdata *dd, u8 port)
1351 struct sdma_engine *sde;
1352 struct rhashtable *tmp_sdma_rht;
1355 struct hfi1_pportdata *ppd = dd->pport + port;
1356 u32 per_sdma_credits;
1357 uint idle_cnt = sdma_idle_cnt;
1358 size_t num_engines = dd->chip_sdma_engines;
1361 if (!HFI1_CAP_IS_KSET(SDMA)) {
1362 HFI1_CAP_CLEAR(SDMA_AHG);
1366 /* can't exceed chip support */
1367 mod_num_sdma <= dd->chip_sdma_engines &&
1368 /* count must be >= vls */
1369 mod_num_sdma >= num_vls)
1370 num_engines = mod_num_sdma;
1372 dd_dev_info(dd, "SDMA mod_num_sdma: %u\n", mod_num_sdma);
1373 dd_dev_info(dd, "SDMA chip_sdma_engines: %u\n", dd->chip_sdma_engines);
1374 dd_dev_info(dd, "SDMA chip_sdma_mem_size: %u\n",
1375 dd->chip_sdma_mem_size);
1378 dd->chip_sdma_mem_size / (num_engines * SDMA_BLOCK_SIZE);
1380 /* set up freeze waitqueue */
1381 init_waitqueue_head(&dd->sdma_unfreeze_wq);
1382 atomic_set(&dd->sdma_unfreeze_count, 0);
1384 descq_cnt = sdma_get_descq_cnt();
1385 dd_dev_info(dd, "SDMA engines %zu descq_cnt %u\n",
1386 num_engines, descq_cnt);
1388 /* alloc memory for array of send engines */
1389 dd->per_sdma = kcalloc(num_engines, sizeof(*dd->per_sdma), GFP_KERNEL);
1393 idle_cnt = ns_to_cclock(dd, idle_cnt);
1396 SDMA_DESC1_HEAD_TO_HOST_FLAG;
1399 SDMA_DESC1_INT_REQ_FLAG;
1401 if (!sdma_desct_intr)
1402 sdma_desct_intr = SDMA_DESC_INTR;
1404 /* Allocate memory for SendDMA descriptor FIFOs */
1405 for (this_idx = 0; this_idx < num_engines; ++this_idx) {
1406 sde = &dd->per_sdma[this_idx];
1409 sde->this_idx = this_idx;
1410 sde->descq_cnt = descq_cnt;
1411 sde->desc_avail = sdma_descq_freecnt(sde);
1412 sde->sdma_shift = ilog2(descq_cnt);
1413 sde->sdma_mask = (1 << sde->sdma_shift) - 1;
1415 /* Create a mask specifically for each interrupt source */
1416 sde->int_mask = (u64)1 << (0 * TXE_NUM_SDMA_ENGINES +
1418 sde->progress_mask = (u64)1 << (1 * TXE_NUM_SDMA_ENGINES +
1420 sde->idle_mask = (u64)1 << (2 * TXE_NUM_SDMA_ENGINES +
1422 /* Create a combined mask to cover all 3 interrupt sources */
1423 sde->imask = sde->int_mask | sde->progress_mask |
1426 spin_lock_init(&sde->tail_lock);
1427 seqlock_init(&sde->head_lock);
1428 spin_lock_init(&sde->senddmactrl_lock);
1429 spin_lock_init(&sde->flushlist_lock);
1430 /* insure there is always a zero bit */
1431 sde->ahg_bits = 0xfffffffe00000000ULL;
1433 sdma_set_state(sde, sdma_state_s00_hw_down);
1435 /* set up reference counting */
1436 kref_init(&sde->state.kref);
1437 init_completion(&sde->state.comp);
1439 INIT_LIST_HEAD(&sde->flushlist);
1440 INIT_LIST_HEAD(&sde->dmawait);
1443 get_kctxt_csr_addr(dd, this_idx, SD(TAIL));
1445 tasklet_init(&sde->sdma_hw_clean_up_task, sdma_hw_clean_up_task,
1446 (unsigned long)sde);
1448 tasklet_init(&sde->sdma_sw_clean_up_task, sdma_sw_clean_up_task,
1449 (unsigned long)sde);
1450 INIT_WORK(&sde->err_halt_worker, sdma_err_halt_wait);
1451 INIT_WORK(&sde->flush_worker, sdma_field_flush);
1453 sde->progress_check_head = 0;
1455 timer_setup(&sde->err_progress_check_timer,
1456 sdma_err_progress_check, 0);
1458 sde->descq = dma_zalloc_coherent(
1460 descq_cnt * sizeof(u64[2]),
1467 kvzalloc_node(sizeof(struct sdma_txreq *) * descq_cnt,
1468 GFP_KERNEL, dd->node);
1473 dd->sdma_heads_size = L1_CACHE_BYTES * num_engines;
1474 /* Allocate memory for DMA of head registers to memory */
1475 dd->sdma_heads_dma = dma_zalloc_coherent(
1477 dd->sdma_heads_size,
1478 &dd->sdma_heads_phys,
1481 if (!dd->sdma_heads_dma) {
1482 dd_dev_err(dd, "failed to allocate SendDMA head memory\n");
1486 /* Allocate memory for pad */
1487 dd->sdma_pad_dma = dma_zalloc_coherent(
1493 if (!dd->sdma_pad_dma) {
1494 dd_dev_err(dd, "failed to allocate SendDMA pad memory\n");
1498 /* assign each engine to different cacheline and init registers */
1499 curr_head = (void *)dd->sdma_heads_dma;
1500 for (this_idx = 0; this_idx < num_engines; ++this_idx) {
1501 unsigned long phys_offset;
1503 sde = &dd->per_sdma[this_idx];
1505 sde->head_dma = curr_head;
1506 curr_head += L1_CACHE_BYTES;
1507 phys_offset = (unsigned long)sde->head_dma -
1508 (unsigned long)dd->sdma_heads_dma;
1509 sde->head_phys = dd->sdma_heads_phys + phys_offset;
1510 init_sdma_regs(sde, per_sdma_credits, idle_cnt);
1512 dd->flags |= HFI1_HAS_SEND_DMA;
1513 dd->flags |= idle_cnt ? HFI1_HAS_SDMA_TIMEOUT : 0;
1514 dd->num_sdma = num_engines;
1515 ret = sdma_map_init(dd, port, ppd->vls_operational, NULL);
1519 tmp_sdma_rht = kzalloc(sizeof(*tmp_sdma_rht), GFP_KERNEL);
1520 if (!tmp_sdma_rht) {
1525 ret = rhashtable_init(tmp_sdma_rht, &sdma_rht_params);
1528 dd->sdma_rht = tmp_sdma_rht;
1530 dd_dev_info(dd, "SDMA num_sdma: %u\n", dd->num_sdma);
1534 sdma_clean(dd, num_engines);
1539 * sdma_all_running() - called when the link goes up
1542 * This routine moves all engines to the running state.
1544 void sdma_all_running(struct hfi1_devdata *dd)
1546 struct sdma_engine *sde;
1549 /* move all engines to running */
1550 for (i = 0; i < dd->num_sdma; ++i) {
1551 sde = &dd->per_sdma[i];
1552 sdma_process_event(sde, sdma_event_e30_go_running);
1557 * sdma_all_idle() - called when the link goes down
1560 * This routine moves all engines to the idle state.
1562 void sdma_all_idle(struct hfi1_devdata *dd)
1564 struct sdma_engine *sde;
1567 /* idle all engines */
1568 for (i = 0; i < dd->num_sdma; ++i) {
1569 sde = &dd->per_sdma[i];
1570 sdma_process_event(sde, sdma_event_e70_go_idle);
1575 * sdma_start() - called to kick off state processing for all engines
1578 * This routine is for kicking off the state processing for all required
1579 * sdma engines. Interrupts need to be working at this point.
1582 void sdma_start(struct hfi1_devdata *dd)
1585 struct sdma_engine *sde;
1587 /* kick off the engines state processing */
1588 for (i = 0; i < dd->num_sdma; ++i) {
1589 sde = &dd->per_sdma[i];
1590 sdma_process_event(sde, sdma_event_e10_go_hw_start);
1595 * sdma_exit() - used when module is removed
1598 void sdma_exit(struct hfi1_devdata *dd)
1601 struct sdma_engine *sde;
1603 for (this_idx = 0; dd->per_sdma && this_idx < dd->num_sdma;
1605 sde = &dd->per_sdma[this_idx];
1606 if (!list_empty(&sde->dmawait))
1607 dd_dev_err(dd, "sde %u: dmawait list not empty!\n",
1609 sdma_process_event(sde, sdma_event_e00_go_hw_down);
1611 del_timer_sync(&sde->err_progress_check_timer);
1614 * This waits for the state machine to exit so it is not
1615 * necessary to kill the sdma_sw_clean_up_task to make sure
1616 * it is not running.
1618 sdma_finalput(&sde->state);
1620 sdma_clean(dd, dd->num_sdma);
1624 * unmap the indicated descriptor
1626 static inline void sdma_unmap_desc(
1627 struct hfi1_devdata *dd,
1628 struct sdma_desc *descp)
1630 switch (sdma_mapping_type(descp)) {
1631 case SDMA_MAP_SINGLE:
1634 sdma_mapping_addr(descp),
1635 sdma_mapping_len(descp),
1641 sdma_mapping_addr(descp),
1642 sdma_mapping_len(descp),
1649 * return the mode as indicated by the first
1650 * descriptor in the tx.
1652 static inline u8 ahg_mode(struct sdma_txreq *tx)
1654 return (tx->descp[0].qw[1] & SDMA_DESC1_HEADER_MODE_SMASK)
1655 >> SDMA_DESC1_HEADER_MODE_SHIFT;
1659 * __sdma_txclean() - clean tx of mappings, descp *kmalloc's
1660 * @dd: hfi1_devdata for unmapping
1661 * @tx: tx request to clean
1663 * This is used in the progress routine to clean the tx or
1664 * by the ULP to toss an in-process tx build.
1666 * The code can be called multiple times without issue.
1669 void __sdma_txclean(
1670 struct hfi1_devdata *dd,
1671 struct sdma_txreq *tx)
1676 u8 skip = 0, mode = ahg_mode(tx);
1679 sdma_unmap_desc(dd, &tx->descp[0]);
1680 /* determine number of AHG descriptors to skip */
1681 if (mode > SDMA_AHG_APPLY_UPDATE1)
1683 for (i = 1 + skip; i < tx->num_desc; i++)
1684 sdma_unmap_desc(dd, &tx->descp[i]);
1687 kfree(tx->coalesce_buf);
1688 tx->coalesce_buf = NULL;
1689 /* kmalloc'ed descp */
1690 if (unlikely(tx->desc_limit > ARRAY_SIZE(tx->descs))) {
1691 tx->desc_limit = ARRAY_SIZE(tx->descs);
1696 static inline u16 sdma_gethead(struct sdma_engine *sde)
1698 struct hfi1_devdata *dd = sde->dd;
1702 #ifdef CONFIG_SDMA_VERBOSITY
1703 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
1704 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
1708 use_dmahead = HFI1_CAP_IS_KSET(USE_SDMA_HEAD) && __sdma_running(sde) &&
1709 (dd->flags & HFI1_HAS_SDMA_TIMEOUT);
1710 hwhead = use_dmahead ?
1711 (u16)le64_to_cpu(*sde->head_dma) :
1712 (u16)read_sde_csr(sde, SD(HEAD));
1714 if (unlikely(HFI1_CAP_IS_KSET(SDMA_HEAD_CHECK))) {
1720 swhead = sde->descq_head & sde->sdma_mask;
1721 /* this code is really bad for cache line trading */
1722 swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
1723 cnt = sde->descq_cnt;
1725 if (swhead < swtail)
1727 sane = (hwhead >= swhead) & (hwhead <= swtail);
1728 else if (swhead > swtail)
1729 /* wrapped around */
1730 sane = ((hwhead >= swhead) && (hwhead < cnt)) ||
1734 sane = (hwhead == swhead);
1736 if (unlikely(!sane)) {
1737 dd_dev_err(dd, "SDMA(%u) bad head (%s) hwhd=%hu swhd=%hu swtl=%hu cnt=%hu\n",
1739 use_dmahead ? "dma" : "kreg",
1740 hwhead, swhead, swtail, cnt);
1742 /* try one more time, using csr */
1746 /* proceed as if no progress */
1754 * This is called when there are send DMA descriptors that might be
1757 * This is called with head_lock held.
1759 static void sdma_desc_avail(struct sdma_engine *sde, uint avail)
1761 struct iowait *wait, *nw;
1762 struct iowait *waits[SDMA_WAIT_BATCH_SIZE];
1763 uint i, n = 0, seq, max_idx = 0;
1764 struct sdma_txreq *stx;
1765 struct hfi1_ibdev *dev = &sde->dd->verbs_dev;
1766 u8 max_starved_cnt = 0;
1768 #ifdef CONFIG_SDMA_VERBOSITY
1769 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n", sde->this_idx,
1770 slashstrip(__FILE__), __LINE__, __func__);
1771 dd_dev_err(sde->dd, "avail: %u\n", avail);
1775 seq = read_seqbegin(&dev->iowait_lock);
1776 if (!list_empty(&sde->dmawait)) {
1777 /* at least one item */
1778 write_seqlock(&dev->iowait_lock);
1779 /* Harvest waiters wanting DMA descriptors */
1780 list_for_each_entry_safe(
1789 if (n == ARRAY_SIZE(waits))
1791 if (!list_empty(&wait->tx_head)) {
1792 stx = list_first_entry(
1796 num_desc = stx->num_desc;
1798 if (num_desc > avail)
1801 /* Find the most starved wait memeber */
1802 iowait_starve_find_max(wait, &max_starved_cnt,
1804 list_del_init(&wait->list);
1807 write_sequnlock(&dev->iowait_lock);
1810 } while (read_seqretry(&dev->iowait_lock, seq));
1812 /* Schedule the most starved one first */
1814 waits[max_idx]->wakeup(waits[max_idx], SDMA_AVAIL_REASON);
1816 for (i = 0; i < n; i++)
1818 waits[i]->wakeup(waits[i], SDMA_AVAIL_REASON);
1821 /* head_lock must be held */
1822 static void sdma_make_progress(struct sdma_engine *sde, u64 status)
1824 struct sdma_txreq *txp = NULL;
1827 int idle_check_done = 0;
1829 hwhead = sdma_gethead(sde);
1831 /* The reason for some of the complexity of this code is that
1832 * not all descriptors have corresponding txps. So, we have to
1833 * be able to skip over descs until we wander into the range of
1834 * the next txp on the list.
1838 txp = get_txhead(sde);
1839 swhead = sde->descq_head & sde->sdma_mask;
1840 trace_hfi1_sdma_progress(sde, hwhead, swhead, txp);
1841 while (swhead != hwhead) {
1842 /* advance head, wrap if needed */
1843 swhead = ++sde->descq_head & sde->sdma_mask;
1845 /* if now past this txp's descs, do the callback */
1846 if (txp && txp->next_descq_idx == swhead) {
1847 /* remove from list */
1848 sde->tx_ring[sde->tx_head++ & sde->sdma_mask] = NULL;
1849 complete_tx(sde, txp, SDMA_TXREQ_S_OK);
1850 /* see if there is another txp */
1851 txp = get_txhead(sde);
1853 trace_hfi1_sdma_progress(sde, hwhead, swhead, txp);
1858 * The SDMA idle interrupt is not guaranteed to be ordered with respect
1859 * to updates to the the dma_head location in host memory. The head
1860 * value read might not be fully up to date. If there are pending
1861 * descriptors and the SDMA idle interrupt fired then read from the
1862 * CSR SDMA head instead to get the latest value from the hardware.
1863 * The hardware SDMA head should be read at most once in this invocation
1864 * of sdma_make_progress(..) which is ensured by idle_check_done flag
1866 if ((status & sde->idle_mask) && !idle_check_done) {
1869 swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
1870 if (swtail != hwhead) {
1871 hwhead = (u16)read_sde_csr(sde, SD(HEAD));
1872 idle_check_done = 1;
1877 sde->last_status = status;
1879 sdma_desc_avail(sde, sdma_descq_freecnt(sde));
1883 * sdma_engine_interrupt() - interrupt handler for engine
1885 * @status: sdma interrupt reason
1887 * Status is a mask of the 3 possible interrupts for this engine. It will
1888 * contain bits _only_ for this SDMA engine. It will contain at least one
1889 * bit, it may contain more.
1891 void sdma_engine_interrupt(struct sdma_engine *sde, u64 status)
1893 trace_hfi1_sdma_engine_interrupt(sde, status);
1894 write_seqlock(&sde->head_lock);
1895 sdma_set_desc_cnt(sde, sdma_desct_intr);
1896 if (status & sde->idle_mask)
1897 sde->idle_int_cnt++;
1898 else if (status & sde->progress_mask)
1899 sde->progress_int_cnt++;
1900 else if (status & sde->int_mask)
1901 sde->sdma_int_cnt++;
1902 sdma_make_progress(sde, status);
1903 write_sequnlock(&sde->head_lock);
1907 * sdma_engine_error() - error handler for engine
1909 * @status: sdma interrupt reason
1911 void sdma_engine_error(struct sdma_engine *sde, u64 status)
1913 unsigned long flags;
1915 #ifdef CONFIG_SDMA_VERBOSITY
1916 dd_dev_err(sde->dd, "CONFIG SDMA(%u) error status 0x%llx state %s\n",
1918 (unsigned long long)status,
1919 sdma_state_names[sde->state.current_state]);
1921 spin_lock_irqsave(&sde->tail_lock, flags);
1922 write_seqlock(&sde->head_lock);
1923 if (status & ALL_SDMA_ENG_HALT_ERRS)
1924 __sdma_process_event(sde, sdma_event_e60_hw_halted);
1925 if (status & ~SD(ENG_ERR_STATUS_SDMA_HALT_ERR_SMASK)) {
1927 "SDMA (%u) engine error: 0x%llx state %s\n",
1929 (unsigned long long)status,
1930 sdma_state_names[sde->state.current_state]);
1931 dump_sdma_state(sde);
1933 write_sequnlock(&sde->head_lock);
1934 spin_unlock_irqrestore(&sde->tail_lock, flags);
1937 static void sdma_sendctrl(struct sdma_engine *sde, unsigned op)
1939 u64 set_senddmactrl = 0;
1940 u64 clr_senddmactrl = 0;
1941 unsigned long flags;
1943 #ifdef CONFIG_SDMA_VERBOSITY
1944 dd_dev_err(sde->dd, "CONFIG SDMA(%u) senddmactrl E=%d I=%d H=%d C=%d\n",
1946 (op & SDMA_SENDCTRL_OP_ENABLE) ? 1 : 0,
1947 (op & SDMA_SENDCTRL_OP_INTENABLE) ? 1 : 0,
1948 (op & SDMA_SENDCTRL_OP_HALT) ? 1 : 0,
1949 (op & SDMA_SENDCTRL_OP_CLEANUP) ? 1 : 0);
1952 if (op & SDMA_SENDCTRL_OP_ENABLE)
1953 set_senddmactrl |= SD(CTRL_SDMA_ENABLE_SMASK);
1955 clr_senddmactrl |= SD(CTRL_SDMA_ENABLE_SMASK);
1957 if (op & SDMA_SENDCTRL_OP_INTENABLE)
1958 set_senddmactrl |= SD(CTRL_SDMA_INT_ENABLE_SMASK);
1960 clr_senddmactrl |= SD(CTRL_SDMA_INT_ENABLE_SMASK);
1962 if (op & SDMA_SENDCTRL_OP_HALT)
1963 set_senddmactrl |= SD(CTRL_SDMA_HALT_SMASK);
1965 clr_senddmactrl |= SD(CTRL_SDMA_HALT_SMASK);
1967 spin_lock_irqsave(&sde->senddmactrl_lock, flags);
1969 sde->p_senddmactrl |= set_senddmactrl;
1970 sde->p_senddmactrl &= ~clr_senddmactrl;
1972 if (op & SDMA_SENDCTRL_OP_CLEANUP)
1973 write_sde_csr(sde, SD(CTRL),
1974 sde->p_senddmactrl |
1975 SD(CTRL_SDMA_CLEANUP_SMASK));
1977 write_sde_csr(sde, SD(CTRL), sde->p_senddmactrl);
1979 spin_unlock_irqrestore(&sde->senddmactrl_lock, flags);
1981 #ifdef CONFIG_SDMA_VERBOSITY
1982 sdma_dumpstate(sde);
1986 static void sdma_setlengen(struct sdma_engine *sde)
1988 #ifdef CONFIG_SDMA_VERBOSITY
1989 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
1990 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
1994 * Set SendDmaLenGen and clear-then-set the MSB of the generation
1995 * count to enable generation checking and load the internal
1996 * generation counter.
1998 write_sde_csr(sde, SD(LEN_GEN),
1999 (sde->descq_cnt / 64) << SD(LEN_GEN_LENGTH_SHIFT));
2000 write_sde_csr(sde, SD(LEN_GEN),
2001 ((sde->descq_cnt / 64) << SD(LEN_GEN_LENGTH_SHIFT)) |
2002 (4ULL << SD(LEN_GEN_GENERATION_SHIFT)));
2005 static inline void sdma_update_tail(struct sdma_engine *sde, u16 tail)
2007 /* Commit writes to memory and advance the tail on the chip */
2008 smp_wmb(); /* see get_txhead() */
2009 writeq(tail, sde->tail_csr);
2013 * This is called when changing to state s10_hw_start_up_halt_wait as
2014 * a result of send buffer errors or send DMA descriptor errors.
2016 static void sdma_hw_start_up(struct sdma_engine *sde)
2020 #ifdef CONFIG_SDMA_VERBOSITY
2021 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
2022 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
2025 sdma_setlengen(sde);
2026 sdma_update_tail(sde, 0); /* Set SendDmaTail */
2029 reg = SD(ENG_ERR_CLEAR_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_MASK) <<
2030 SD(ENG_ERR_CLEAR_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_SHIFT);
2031 write_sde_csr(sde, SD(ENG_ERR_CLEAR), reg);
2035 * set_sdma_integrity
2037 * Set the SEND_DMA_CHECK_ENABLE register for send DMA engine 'sde'.
2039 static void set_sdma_integrity(struct sdma_engine *sde)
2041 struct hfi1_devdata *dd = sde->dd;
2043 write_sde_csr(sde, SD(CHECK_ENABLE),
2044 hfi1_pkt_base_sdma_integrity(dd));
2047 static void init_sdma_regs(
2048 struct sdma_engine *sde,
2053 #ifdef CONFIG_SDMA_VERBOSITY
2054 struct hfi1_devdata *dd = sde->dd;
2056 dd_dev_err(dd, "CONFIG SDMA(%u) %s:%d %s()\n",
2057 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
2060 write_sde_csr(sde, SD(BASE_ADDR), sde->descq_phys);
2061 sdma_setlengen(sde);
2062 sdma_update_tail(sde, 0); /* Set SendDmaTail */
2063 write_sde_csr(sde, SD(RELOAD_CNT), idle_cnt);
2064 write_sde_csr(sde, SD(DESC_CNT), 0);
2065 write_sde_csr(sde, SD(HEAD_ADDR), sde->head_phys);
2066 write_sde_csr(sde, SD(MEMORY),
2067 ((u64)credits << SD(MEMORY_SDMA_MEMORY_CNT_SHIFT)) |
2068 ((u64)(credits * sde->this_idx) <<
2069 SD(MEMORY_SDMA_MEMORY_INDEX_SHIFT)));
2070 write_sde_csr(sde, SD(ENG_ERR_MASK), ~0ull);
2071 set_sdma_integrity(sde);
2072 opmask = OPCODE_CHECK_MASK_DISABLED;
2073 opval = OPCODE_CHECK_VAL_DISABLED;
2074 write_sde_csr(sde, SD(CHECK_OPCODE),
2075 (opmask << SEND_CTXT_CHECK_OPCODE_MASK_SHIFT) |
2076 (opval << SEND_CTXT_CHECK_OPCODE_VALUE_SHIFT));
2079 #ifdef CONFIG_SDMA_VERBOSITY
2081 #define sdma_dumpstate_helper0(reg) do { \
2082 csr = read_csr(sde->dd, reg); \
2083 dd_dev_err(sde->dd, "%36s 0x%016llx\n", #reg, csr); \
2086 #define sdma_dumpstate_helper(reg) do { \
2087 csr = read_sde_csr(sde, reg); \
2088 dd_dev_err(sde->dd, "%36s[%02u] 0x%016llx\n", \
2089 #reg, sde->this_idx, csr); \
2092 #define sdma_dumpstate_helper2(reg) do { \
2093 csr = read_csr(sde->dd, reg + (8 * i)); \
2094 dd_dev_err(sde->dd, "%33s_%02u 0x%016llx\n", \
2098 void sdma_dumpstate(struct sdma_engine *sde)
2103 sdma_dumpstate_helper(SD(CTRL));
2104 sdma_dumpstate_helper(SD(STATUS));
2105 sdma_dumpstate_helper0(SD(ERR_STATUS));
2106 sdma_dumpstate_helper0(SD(ERR_MASK));
2107 sdma_dumpstate_helper(SD(ENG_ERR_STATUS));
2108 sdma_dumpstate_helper(SD(ENG_ERR_MASK));
2110 for (i = 0; i < CCE_NUM_INT_CSRS; ++i) {
2111 sdma_dumpstate_helper2(CCE_INT_STATUS);
2112 sdma_dumpstate_helper2(CCE_INT_MASK);
2113 sdma_dumpstate_helper2(CCE_INT_BLOCKED);
2116 sdma_dumpstate_helper(SD(TAIL));
2117 sdma_dumpstate_helper(SD(HEAD));
2118 sdma_dumpstate_helper(SD(PRIORITY_THLD));
2119 sdma_dumpstate_helper(SD(IDLE_CNT));
2120 sdma_dumpstate_helper(SD(RELOAD_CNT));
2121 sdma_dumpstate_helper(SD(DESC_CNT));
2122 sdma_dumpstate_helper(SD(DESC_FETCHED_CNT));
2123 sdma_dumpstate_helper(SD(MEMORY));
2124 sdma_dumpstate_helper0(SD(ENGINES));
2125 sdma_dumpstate_helper0(SD(MEM_SIZE));
2126 /* sdma_dumpstate_helper(SEND_EGRESS_SEND_DMA_STATUS); */
2127 sdma_dumpstate_helper(SD(BASE_ADDR));
2128 sdma_dumpstate_helper(SD(LEN_GEN));
2129 sdma_dumpstate_helper(SD(HEAD_ADDR));
2130 sdma_dumpstate_helper(SD(CHECK_ENABLE));
2131 sdma_dumpstate_helper(SD(CHECK_VL));
2132 sdma_dumpstate_helper(SD(CHECK_JOB_KEY));
2133 sdma_dumpstate_helper(SD(CHECK_PARTITION_KEY));
2134 sdma_dumpstate_helper(SD(CHECK_SLID));
2135 sdma_dumpstate_helper(SD(CHECK_OPCODE));
2139 static void dump_sdma_state(struct sdma_engine *sde)
2141 struct hw_sdma_desc *descqp;
2146 u16 head, tail, cnt;
2148 head = sde->descq_head & sde->sdma_mask;
2149 tail = sde->descq_tail & sde->sdma_mask;
2150 cnt = sdma_descq_freecnt(sde);
2153 "SDMA (%u) descq_head: %u descq_tail: %u freecnt: %u FLE %d\n",
2154 sde->this_idx, head, tail, cnt,
2155 !list_empty(&sde->flushlist));
2157 /* print info for each entry in the descriptor queue */
2158 while (head != tail) {
2159 char flags[6] = { 'x', 'x', 'x', 'x', 0 };
2161 descqp = &sde->descq[head];
2162 desc[0] = le64_to_cpu(descqp->qw[0]);
2163 desc[1] = le64_to_cpu(descqp->qw[1]);
2164 flags[0] = (desc[1] & SDMA_DESC1_INT_REQ_FLAG) ? 'I' : '-';
2165 flags[1] = (desc[1] & SDMA_DESC1_HEAD_TO_HOST_FLAG) ?
2167 flags[2] = (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) ? 'F' : '-';
2168 flags[3] = (desc[0] & SDMA_DESC0_LAST_DESC_FLAG) ? 'L' : '-';
2169 addr = (desc[0] >> SDMA_DESC0_PHY_ADDR_SHIFT)
2170 & SDMA_DESC0_PHY_ADDR_MASK;
2171 gen = (desc[1] >> SDMA_DESC1_GENERATION_SHIFT)
2172 & SDMA_DESC1_GENERATION_MASK;
2173 len = (desc[0] >> SDMA_DESC0_BYTE_COUNT_SHIFT)
2174 & SDMA_DESC0_BYTE_COUNT_MASK;
2176 "SDMA sdmadesc[%u]: flags:%s addr:0x%016llx gen:%u len:%u bytes\n",
2177 head, flags, addr, gen, len);
2179 "\tdesc0:0x%016llx desc1 0x%016llx\n",
2181 if (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG)
2183 "\taidx: %u amode: %u alen: %u\n",
2185 SDMA_DESC1_HEADER_INDEX_SMASK) >>
2186 SDMA_DESC1_HEADER_INDEX_SHIFT),
2188 SDMA_DESC1_HEADER_MODE_SMASK) >>
2189 SDMA_DESC1_HEADER_MODE_SHIFT),
2191 SDMA_DESC1_HEADER_DWS_SMASK) >>
2192 SDMA_DESC1_HEADER_DWS_SHIFT));
2194 head &= sde->sdma_mask;
2199 "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"
2201 * sdma_seqfile_dump_sde() - debugfs dump of sde
2203 * @sde: send dma engine to dump
2205 * This routine dumps the sde to the indicated seq file.
2207 void sdma_seqfile_dump_sde(struct seq_file *s, struct sdma_engine *sde)
2210 struct hw_sdma_desc *descqp;
2216 head = sde->descq_head & sde->sdma_mask;
2217 tail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
2218 seq_printf(s, SDE_FMT, sde->this_idx,
2220 sdma_state_name(sde->state.current_state),
2221 (unsigned long long)read_sde_csr(sde, SD(CTRL)),
2222 (unsigned long long)read_sde_csr(sde, SD(STATUS)),
2223 (unsigned long long)read_sde_csr(sde, SD(ENG_ERR_STATUS)),
2224 (unsigned long long)read_sde_csr(sde, SD(TAIL)), tail,
2225 (unsigned long long)read_sde_csr(sde, SD(HEAD)), head,
2226 (unsigned long long)le64_to_cpu(*sde->head_dma),
2227 (unsigned long long)read_sde_csr(sde, SD(MEMORY)),
2228 (unsigned long long)read_sde_csr(sde, SD(LEN_GEN)),
2229 (unsigned long long)read_sde_csr(sde, SD(RELOAD_CNT)),
2230 (unsigned long long)sde->last_status,
2231 (unsigned long long)sde->ahg_bits,
2236 !list_empty(&sde->flushlist),
2237 sde->descq_full_count,
2238 (unsigned long long)read_sde_csr(sde, SEND_DMA_CHECK_SLID));
2240 /* print info for each entry in the descriptor queue */
2241 while (head != tail) {
2242 char flags[6] = { 'x', 'x', 'x', 'x', 0 };
2244 descqp = &sde->descq[head];
2245 desc[0] = le64_to_cpu(descqp->qw[0]);
2246 desc[1] = le64_to_cpu(descqp->qw[1]);
2247 flags[0] = (desc[1] & SDMA_DESC1_INT_REQ_FLAG) ? 'I' : '-';
2248 flags[1] = (desc[1] & SDMA_DESC1_HEAD_TO_HOST_FLAG) ?
2250 flags[2] = (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) ? 'F' : '-';
2251 flags[3] = (desc[0] & SDMA_DESC0_LAST_DESC_FLAG) ? 'L' : '-';
2252 addr = (desc[0] >> SDMA_DESC0_PHY_ADDR_SHIFT)
2253 & SDMA_DESC0_PHY_ADDR_MASK;
2254 gen = (desc[1] >> SDMA_DESC1_GENERATION_SHIFT)
2255 & SDMA_DESC1_GENERATION_MASK;
2256 len = (desc[0] >> SDMA_DESC0_BYTE_COUNT_SHIFT)
2257 & SDMA_DESC0_BYTE_COUNT_MASK;
2259 "\tdesc[%u]: flags:%s addr:0x%016llx gen:%u len:%u bytes\n",
2260 head, flags, addr, gen, len);
2261 if (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG)
2262 seq_printf(s, "\t\tahgidx: %u ahgmode: %u\n",
2264 SDMA_DESC1_HEADER_INDEX_SMASK) >>
2265 SDMA_DESC1_HEADER_INDEX_SHIFT),
2267 SDMA_DESC1_HEADER_MODE_SMASK) >>
2268 SDMA_DESC1_HEADER_MODE_SHIFT));
2269 head = (head + 1) & sde->sdma_mask;
2274 * add the generation number into
2275 * the qw1 and return
2277 static inline u64 add_gen(struct sdma_engine *sde, u64 qw1)
2279 u8 generation = (sde->descq_tail >> sde->sdma_shift) & 3;
2281 qw1 &= ~SDMA_DESC1_GENERATION_SMASK;
2282 qw1 |= ((u64)generation & SDMA_DESC1_GENERATION_MASK)
2283 << SDMA_DESC1_GENERATION_SHIFT;
2288 * This routine submits the indicated tx
2290 * Space has already been guaranteed and
2291 * tail side of ring is locked.
2293 * The hardware tail update is done
2294 * in the caller and that is facilitated
2295 * by returning the new tail.
2297 * There is special case logic for ahg
2298 * to not add the generation number for
2299 * up to 2 descriptors that follow the
2303 static inline u16 submit_tx(struct sdma_engine *sde, struct sdma_txreq *tx)
2307 struct sdma_desc *descp = tx->descp;
2308 u8 skip = 0, mode = ahg_mode(tx);
2310 tail = sde->descq_tail & sde->sdma_mask;
2311 sde->descq[tail].qw[0] = cpu_to_le64(descp->qw[0]);
2312 sde->descq[tail].qw[1] = cpu_to_le64(add_gen(sde, descp->qw[1]));
2313 trace_hfi1_sdma_descriptor(sde, descp->qw[0], descp->qw[1],
2314 tail, &sde->descq[tail]);
2315 tail = ++sde->descq_tail & sde->sdma_mask;
2317 if (mode > SDMA_AHG_APPLY_UPDATE1)
2319 for (i = 1; i < tx->num_desc; i++, descp++) {
2322 sde->descq[tail].qw[0] = cpu_to_le64(descp->qw[0]);
2324 /* edits don't have generation */
2328 /* replace generation with real one for non-edits */
2329 qw1 = add_gen(sde, descp->qw[1]);
2331 sde->descq[tail].qw[1] = cpu_to_le64(qw1);
2332 trace_hfi1_sdma_descriptor(sde, descp->qw[0], qw1,
2333 tail, &sde->descq[tail]);
2334 tail = ++sde->descq_tail & sde->sdma_mask;
2336 tx->next_descq_idx = tail;
2337 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
2338 tx->sn = sde->tail_sn++;
2339 trace_hfi1_sdma_in_sn(sde, tx->sn);
2340 WARN_ON_ONCE(sde->tx_ring[sde->tx_tail & sde->sdma_mask]);
2342 sde->tx_ring[sde->tx_tail++ & sde->sdma_mask] = tx;
2343 sde->desc_avail -= tx->num_desc;
2348 * Check for progress
2350 static int sdma_check_progress(
2351 struct sdma_engine *sde,
2352 struct iowait *wait,
2353 struct sdma_txreq *tx,
2358 sde->desc_avail = sdma_descq_freecnt(sde);
2359 if (tx->num_desc <= sde->desc_avail)
2361 /* pulse the head_lock */
2362 if (wait && wait->sleep) {
2365 seq = raw_seqcount_begin(
2366 (const seqcount_t *)&sde->head_lock.seqcount);
2367 ret = wait->sleep(sde, wait, tx, seq, pkts_sent);
2369 sde->desc_avail = sdma_descq_freecnt(sde);
2377 * sdma_send_txreq() - submit a tx req to ring
2378 * @sde: sdma engine to use
2379 * @wait: wait structure to use when full (may be NULL)
2380 * @tx: sdma_txreq to submit
2381 * @pkts_sent: has any packet been sent yet?
2383 * The call submits the tx into the ring. If a iowait structure is non-NULL
2384 * the packet will be queued to the list in wait.
2387 * 0 - Success, -EINVAL - sdma_txreq incomplete, -EBUSY - no space in
2388 * ring (wait == NULL)
2389 * -EIOCBQUEUED - tx queued to iowait, -ECOMM bad sdma state
2391 int sdma_send_txreq(struct sdma_engine *sde,
2392 struct iowait *wait,
2393 struct sdma_txreq *tx,
2398 unsigned long flags;
2400 /* user should have supplied entire packet */
2401 if (unlikely(tx->tlen))
2404 spin_lock_irqsave(&sde->tail_lock, flags);
2406 if (unlikely(!__sdma_running(sde)))
2408 if (unlikely(tx->num_desc > sde->desc_avail))
2410 tail = submit_tx(sde, tx);
2412 iowait_sdma_inc(wait);
2413 sdma_update_tail(sde, tail);
2415 spin_unlock_irqrestore(&sde->tail_lock, flags);
2419 iowait_sdma_inc(wait);
2420 tx->next_descq_idx = 0;
2421 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
2422 tx->sn = sde->tail_sn++;
2423 trace_hfi1_sdma_in_sn(sde, tx->sn);
2425 spin_lock(&sde->flushlist_lock);
2426 list_add_tail(&tx->list, &sde->flushlist);
2427 spin_unlock(&sde->flushlist_lock);
2430 wait->count += tx->num_desc;
2432 schedule_work(&sde->flush_worker);
2436 ret = sdma_check_progress(sde, wait, tx, pkts_sent);
2437 if (ret == -EAGAIN) {
2441 sde->descq_full_count++;
2446 * sdma_send_txlist() - submit a list of tx req to ring
2447 * @sde: sdma engine to use
2448 * @wait: wait structure to use when full (may be NULL)
2449 * @tx_list: list of sdma_txreqs to submit
2450 * @count: pointer to a u32 which, after return will contain the total number of
2451 * sdma_txreqs removed from the tx_list. This will include sdma_txreqs
2452 * whose SDMA descriptors are submitted to the ring and the sdma_txreqs
2453 * which are added to SDMA engine flush list if the SDMA engine state is
2456 * The call submits the list into the ring.
2458 * If the iowait structure is non-NULL and not equal to the iowait list
2459 * the unprocessed part of the list will be appended to the list in wait.
2461 * In all cases, the tx_list will be updated so the head of the tx_list is
2462 * the list of descriptors that have yet to be transmitted.
2464 * The intent of this call is to provide a more efficient
2465 * way of submitting multiple packets to SDMA while holding the tail
2470 * -EINVAL - sdma_txreq incomplete, -EBUSY - no space in ring (wait == NULL)
2471 * -EIOCBQUEUED - tx queued to iowait, -ECOMM bad sdma state
2473 int sdma_send_txlist(struct sdma_engine *sde, struct iowait *wait,
2474 struct list_head *tx_list, u32 *count_out)
2476 struct sdma_txreq *tx, *tx_next;
2478 unsigned long flags;
2479 u16 tail = INVALID_TAIL;
2480 u32 submit_count = 0, flush_count = 0, total_count;
2482 spin_lock_irqsave(&sde->tail_lock, flags);
2484 list_for_each_entry_safe(tx, tx_next, tx_list, list) {
2486 if (unlikely(!__sdma_running(sde)))
2488 if (unlikely(tx->num_desc > sde->desc_avail))
2490 if (unlikely(tx->tlen)) {
2494 list_del_init(&tx->list);
2495 tail = submit_tx(sde, tx);
2497 if (tail != INVALID_TAIL &&
2498 (submit_count & SDMA_TAIL_UPDATE_THRESH) == 0) {
2499 sdma_update_tail(sde, tail);
2500 tail = INVALID_TAIL;
2504 total_count = submit_count + flush_count;
2506 iowait_sdma_add(wait, total_count);
2507 iowait_starve_clear(submit_count > 0, wait);
2509 if (tail != INVALID_TAIL)
2510 sdma_update_tail(sde, tail);
2511 spin_unlock_irqrestore(&sde->tail_lock, flags);
2512 *count_out = total_count;
2515 spin_lock(&sde->flushlist_lock);
2516 list_for_each_entry_safe(tx, tx_next, tx_list, list) {
2518 list_del_init(&tx->list);
2519 tx->next_descq_idx = 0;
2520 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
2521 tx->sn = sde->tail_sn++;
2522 trace_hfi1_sdma_in_sn(sde, tx->sn);
2524 list_add_tail(&tx->list, &sde->flushlist);
2528 wait->count += tx->num_desc;
2531 spin_unlock(&sde->flushlist_lock);
2532 schedule_work(&sde->flush_worker);
2536 ret = sdma_check_progress(sde, wait, tx, submit_count > 0);
2537 if (ret == -EAGAIN) {
2541 sde->descq_full_count++;
2545 static void sdma_process_event(struct sdma_engine *sde, enum sdma_events event)
2547 unsigned long flags;
2549 spin_lock_irqsave(&sde->tail_lock, flags);
2550 write_seqlock(&sde->head_lock);
2552 __sdma_process_event(sde, event);
2554 if (sde->state.current_state == sdma_state_s99_running)
2555 sdma_desc_avail(sde, sdma_descq_freecnt(sde));
2557 write_sequnlock(&sde->head_lock);
2558 spin_unlock_irqrestore(&sde->tail_lock, flags);
2561 static void __sdma_process_event(struct sdma_engine *sde,
2562 enum sdma_events event)
2564 struct sdma_state *ss = &sde->state;
2565 int need_progress = 0;
2567 /* CONFIG SDMA temporary */
2568 #ifdef CONFIG_SDMA_VERBOSITY
2569 dd_dev_err(sde->dd, "CONFIG SDMA(%u) [%s] %s\n", sde->this_idx,
2570 sdma_state_names[ss->current_state],
2571 sdma_event_names[event]);
2574 switch (ss->current_state) {
2575 case sdma_state_s00_hw_down:
2577 case sdma_event_e00_go_hw_down:
2579 case sdma_event_e30_go_running:
2581 * If down, but running requested (usually result
2582 * of link up, then we need to start up.
2583 * This can happen when hw down is requested while
2584 * bringing the link up with traffic active on
2587 ss->go_s99_running = 1;
2588 /* fall through -- and start dma engine */
2589 case sdma_event_e10_go_hw_start:
2590 /* This reference means the state machine is started */
2591 sdma_get(&sde->state);
2593 sdma_state_s10_hw_start_up_halt_wait);
2595 case sdma_event_e15_hw_halt_done:
2597 case sdma_event_e25_hw_clean_up_done:
2599 case sdma_event_e40_sw_cleaned:
2600 sdma_sw_tear_down(sde);
2602 case sdma_event_e50_hw_cleaned:
2604 case sdma_event_e60_hw_halted:
2606 case sdma_event_e70_go_idle:
2608 case sdma_event_e80_hw_freeze:
2610 case sdma_event_e81_hw_frozen:
2612 case sdma_event_e82_hw_unfreeze:
2614 case sdma_event_e85_link_down:
2616 case sdma_event_e90_sw_halted:
2621 case sdma_state_s10_hw_start_up_halt_wait:
2623 case sdma_event_e00_go_hw_down:
2624 sdma_set_state(sde, sdma_state_s00_hw_down);
2625 sdma_sw_tear_down(sde);
2627 case sdma_event_e10_go_hw_start:
2629 case sdma_event_e15_hw_halt_done:
2631 sdma_state_s15_hw_start_up_clean_wait);
2632 sdma_start_hw_clean_up(sde);
2634 case sdma_event_e25_hw_clean_up_done:
2636 case sdma_event_e30_go_running:
2637 ss->go_s99_running = 1;
2639 case sdma_event_e40_sw_cleaned:
2641 case sdma_event_e50_hw_cleaned:
2643 case sdma_event_e60_hw_halted:
2644 schedule_work(&sde->err_halt_worker);
2646 case sdma_event_e70_go_idle:
2647 ss->go_s99_running = 0;
2649 case sdma_event_e80_hw_freeze:
2651 case sdma_event_e81_hw_frozen:
2653 case sdma_event_e82_hw_unfreeze:
2655 case sdma_event_e85_link_down:
2657 case sdma_event_e90_sw_halted:
2662 case sdma_state_s15_hw_start_up_clean_wait:
2664 case sdma_event_e00_go_hw_down:
2665 sdma_set_state(sde, sdma_state_s00_hw_down);
2666 sdma_sw_tear_down(sde);
2668 case sdma_event_e10_go_hw_start:
2670 case sdma_event_e15_hw_halt_done:
2672 case sdma_event_e25_hw_clean_up_done:
2673 sdma_hw_start_up(sde);
2674 sdma_set_state(sde, ss->go_s99_running ?
2675 sdma_state_s99_running :
2676 sdma_state_s20_idle);
2678 case sdma_event_e30_go_running:
2679 ss->go_s99_running = 1;
2681 case sdma_event_e40_sw_cleaned:
2683 case sdma_event_e50_hw_cleaned:
2685 case sdma_event_e60_hw_halted:
2687 case sdma_event_e70_go_idle:
2688 ss->go_s99_running = 0;
2690 case sdma_event_e80_hw_freeze:
2692 case sdma_event_e81_hw_frozen:
2694 case sdma_event_e82_hw_unfreeze:
2696 case sdma_event_e85_link_down:
2698 case sdma_event_e90_sw_halted:
2703 case sdma_state_s20_idle:
2705 case sdma_event_e00_go_hw_down:
2706 sdma_set_state(sde, sdma_state_s00_hw_down);
2707 sdma_sw_tear_down(sde);
2709 case sdma_event_e10_go_hw_start:
2711 case sdma_event_e15_hw_halt_done:
2713 case sdma_event_e25_hw_clean_up_done:
2715 case sdma_event_e30_go_running:
2716 sdma_set_state(sde, sdma_state_s99_running);
2717 ss->go_s99_running = 1;
2719 case sdma_event_e40_sw_cleaned:
2721 case sdma_event_e50_hw_cleaned:
2723 case sdma_event_e60_hw_halted:
2724 sdma_set_state(sde, sdma_state_s50_hw_halt_wait);
2725 schedule_work(&sde->err_halt_worker);
2727 case sdma_event_e70_go_idle:
2729 case sdma_event_e85_link_down:
2731 case sdma_event_e80_hw_freeze:
2732 sdma_set_state(sde, sdma_state_s80_hw_freeze);
2733 atomic_dec(&sde->dd->sdma_unfreeze_count);
2734 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
2736 case sdma_event_e81_hw_frozen:
2738 case sdma_event_e82_hw_unfreeze:
2740 case sdma_event_e90_sw_halted:
2745 case sdma_state_s30_sw_clean_up_wait:
2747 case sdma_event_e00_go_hw_down:
2748 sdma_set_state(sde, sdma_state_s00_hw_down);
2750 case sdma_event_e10_go_hw_start:
2752 case sdma_event_e15_hw_halt_done:
2754 case sdma_event_e25_hw_clean_up_done:
2756 case sdma_event_e30_go_running:
2757 ss->go_s99_running = 1;
2759 case sdma_event_e40_sw_cleaned:
2760 sdma_set_state(sde, sdma_state_s40_hw_clean_up_wait);
2761 sdma_start_hw_clean_up(sde);
2763 case sdma_event_e50_hw_cleaned:
2765 case sdma_event_e60_hw_halted:
2767 case sdma_event_e70_go_idle:
2768 ss->go_s99_running = 0;
2770 case sdma_event_e80_hw_freeze:
2772 case sdma_event_e81_hw_frozen:
2774 case sdma_event_e82_hw_unfreeze:
2776 case sdma_event_e85_link_down:
2777 ss->go_s99_running = 0;
2779 case sdma_event_e90_sw_halted:
2784 case sdma_state_s40_hw_clean_up_wait:
2786 case sdma_event_e00_go_hw_down:
2787 sdma_set_state(sde, sdma_state_s00_hw_down);
2788 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2790 case sdma_event_e10_go_hw_start:
2792 case sdma_event_e15_hw_halt_done:
2794 case sdma_event_e25_hw_clean_up_done:
2795 sdma_hw_start_up(sde);
2796 sdma_set_state(sde, ss->go_s99_running ?
2797 sdma_state_s99_running :
2798 sdma_state_s20_idle);
2800 case sdma_event_e30_go_running:
2801 ss->go_s99_running = 1;
2803 case sdma_event_e40_sw_cleaned:
2805 case sdma_event_e50_hw_cleaned:
2807 case sdma_event_e60_hw_halted:
2809 case sdma_event_e70_go_idle:
2810 ss->go_s99_running = 0;
2812 case sdma_event_e80_hw_freeze:
2814 case sdma_event_e81_hw_frozen:
2816 case sdma_event_e82_hw_unfreeze:
2818 case sdma_event_e85_link_down:
2819 ss->go_s99_running = 0;
2821 case sdma_event_e90_sw_halted:
2826 case sdma_state_s50_hw_halt_wait:
2828 case sdma_event_e00_go_hw_down:
2829 sdma_set_state(sde, sdma_state_s00_hw_down);
2830 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2832 case sdma_event_e10_go_hw_start:
2834 case sdma_event_e15_hw_halt_done:
2835 sdma_set_state(sde, sdma_state_s30_sw_clean_up_wait);
2836 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2838 case sdma_event_e25_hw_clean_up_done:
2840 case sdma_event_e30_go_running:
2841 ss->go_s99_running = 1;
2843 case sdma_event_e40_sw_cleaned:
2845 case sdma_event_e50_hw_cleaned:
2847 case sdma_event_e60_hw_halted:
2848 schedule_work(&sde->err_halt_worker);
2850 case sdma_event_e70_go_idle:
2851 ss->go_s99_running = 0;
2853 case sdma_event_e80_hw_freeze:
2855 case sdma_event_e81_hw_frozen:
2857 case sdma_event_e82_hw_unfreeze:
2859 case sdma_event_e85_link_down:
2860 ss->go_s99_running = 0;
2862 case sdma_event_e90_sw_halted:
2867 case sdma_state_s60_idle_halt_wait:
2869 case sdma_event_e00_go_hw_down:
2870 sdma_set_state(sde, sdma_state_s00_hw_down);
2871 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2873 case sdma_event_e10_go_hw_start:
2875 case sdma_event_e15_hw_halt_done:
2876 sdma_set_state(sde, sdma_state_s30_sw_clean_up_wait);
2877 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2879 case sdma_event_e25_hw_clean_up_done:
2881 case sdma_event_e30_go_running:
2882 ss->go_s99_running = 1;
2884 case sdma_event_e40_sw_cleaned:
2886 case sdma_event_e50_hw_cleaned:
2888 case sdma_event_e60_hw_halted:
2889 schedule_work(&sde->err_halt_worker);
2891 case sdma_event_e70_go_idle:
2892 ss->go_s99_running = 0;
2894 case sdma_event_e80_hw_freeze:
2896 case sdma_event_e81_hw_frozen:
2898 case sdma_event_e82_hw_unfreeze:
2900 case sdma_event_e85_link_down:
2902 case sdma_event_e90_sw_halted:
2907 case sdma_state_s80_hw_freeze:
2909 case sdma_event_e00_go_hw_down:
2910 sdma_set_state(sde, sdma_state_s00_hw_down);
2911 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2913 case sdma_event_e10_go_hw_start:
2915 case sdma_event_e15_hw_halt_done:
2917 case sdma_event_e25_hw_clean_up_done:
2919 case sdma_event_e30_go_running:
2920 ss->go_s99_running = 1;
2922 case sdma_event_e40_sw_cleaned:
2924 case sdma_event_e50_hw_cleaned:
2926 case sdma_event_e60_hw_halted:
2928 case sdma_event_e70_go_idle:
2929 ss->go_s99_running = 0;
2931 case sdma_event_e80_hw_freeze:
2933 case sdma_event_e81_hw_frozen:
2934 sdma_set_state(sde, sdma_state_s82_freeze_sw_clean);
2935 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2937 case sdma_event_e82_hw_unfreeze:
2939 case sdma_event_e85_link_down:
2941 case sdma_event_e90_sw_halted:
2946 case sdma_state_s82_freeze_sw_clean:
2948 case sdma_event_e00_go_hw_down:
2949 sdma_set_state(sde, sdma_state_s00_hw_down);
2950 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2952 case sdma_event_e10_go_hw_start:
2954 case sdma_event_e15_hw_halt_done:
2956 case sdma_event_e25_hw_clean_up_done:
2958 case sdma_event_e30_go_running:
2959 ss->go_s99_running = 1;
2961 case sdma_event_e40_sw_cleaned:
2962 /* notify caller this engine is done cleaning */
2963 atomic_dec(&sde->dd->sdma_unfreeze_count);
2964 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
2966 case sdma_event_e50_hw_cleaned:
2968 case sdma_event_e60_hw_halted:
2970 case sdma_event_e70_go_idle:
2971 ss->go_s99_running = 0;
2973 case sdma_event_e80_hw_freeze:
2975 case sdma_event_e81_hw_frozen:
2977 case sdma_event_e82_hw_unfreeze:
2978 sdma_hw_start_up(sde);
2979 sdma_set_state(sde, ss->go_s99_running ?
2980 sdma_state_s99_running :
2981 sdma_state_s20_idle);
2983 case sdma_event_e85_link_down:
2985 case sdma_event_e90_sw_halted:
2990 case sdma_state_s99_running:
2992 case sdma_event_e00_go_hw_down:
2993 sdma_set_state(sde, sdma_state_s00_hw_down);
2994 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2996 case sdma_event_e10_go_hw_start:
2998 case sdma_event_e15_hw_halt_done:
3000 case sdma_event_e25_hw_clean_up_done:
3002 case sdma_event_e30_go_running:
3004 case sdma_event_e40_sw_cleaned:
3006 case sdma_event_e50_hw_cleaned:
3008 case sdma_event_e60_hw_halted:
3010 sdma_err_progress_check_schedule(sde);
3012 case sdma_event_e90_sw_halted:
3014 * SW initiated halt does not perform engines
3017 sdma_set_state(sde, sdma_state_s50_hw_halt_wait);
3018 schedule_work(&sde->err_halt_worker);
3020 case sdma_event_e70_go_idle:
3021 sdma_set_state(sde, sdma_state_s60_idle_halt_wait);
3023 case sdma_event_e85_link_down:
3024 ss->go_s99_running = 0;
3026 case sdma_event_e80_hw_freeze:
3027 sdma_set_state(sde, sdma_state_s80_hw_freeze);
3028 atomic_dec(&sde->dd->sdma_unfreeze_count);
3029 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
3031 case sdma_event_e81_hw_frozen:
3033 case sdma_event_e82_hw_unfreeze:
3039 ss->last_event = event;
3041 sdma_make_progress(sde, 0);
3045 * _extend_sdma_tx_descs() - helper to extend txreq
3047 * This is called once the initial nominal allocation
3048 * of descriptors in the sdma_txreq is exhausted.
3050 * The code will bump the allocation up to the max
3051 * of MAX_DESC (64) descriptors. There doesn't seem
3052 * much point in an interim step. The last descriptor
3053 * is reserved for coalesce buffer in order to support
3054 * cases where input packet has >MAX_DESC iovecs.
3057 static int _extend_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx)
3061 /* Handle last descriptor */
3062 if (unlikely((tx->num_desc == (MAX_DESC - 1)))) {
3063 /* if tlen is 0, it is for padding, release last descriptor */
3065 tx->desc_limit = MAX_DESC;
3066 } else if (!tx->coalesce_buf) {
3067 /* allocate coalesce buffer with space for padding */
3068 tx->coalesce_buf = kmalloc(tx->tlen + sizeof(u32),
3070 if (!tx->coalesce_buf)
3072 tx->coalesce_idx = 0;
3077 if (unlikely(tx->num_desc == MAX_DESC))
3080 tx->descp = kmalloc_array(
3082 sizeof(struct sdma_desc),
3087 /* reserve last descriptor for coalescing */
3088 tx->desc_limit = MAX_DESC - 1;
3089 /* copy ones already built */
3090 for (i = 0; i < tx->num_desc; i++)
3091 tx->descp[i] = tx->descs[i];
3094 __sdma_txclean(dd, tx);
3099 * ext_coal_sdma_tx_descs() - extend or coalesce sdma tx descriptors
3101 * This is called once the initial nominal allocation of descriptors
3102 * in the sdma_txreq is exhausted.
3104 * This function calls _extend_sdma_tx_descs to extend or allocate
3105 * coalesce buffer. If there is a allocated coalesce buffer, it will
3106 * copy the input packet data into the coalesce buffer. It also adds
3107 * coalesce buffer descriptor once when whole packet is received.
3111 * 0 - coalescing, don't populate descriptor
3112 * 1 - continue with populating descriptor
3114 int ext_coal_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx,
3115 int type, void *kvaddr, struct page *page,
3116 unsigned long offset, u16 len)
3121 rval = _extend_sdma_tx_descs(dd, tx);
3123 __sdma_txclean(dd, tx);
3127 /* If coalesce buffer is allocated, copy data into it */
3128 if (tx->coalesce_buf) {
3129 if (type == SDMA_MAP_NONE) {
3130 __sdma_txclean(dd, tx);
3134 if (type == SDMA_MAP_PAGE) {
3135 kvaddr = kmap(page);
3137 } else if (WARN_ON(!kvaddr)) {
3138 __sdma_txclean(dd, tx);
3142 memcpy(tx->coalesce_buf + tx->coalesce_idx, kvaddr, len);
3143 tx->coalesce_idx += len;
3144 if (type == SDMA_MAP_PAGE)
3147 /* If there is more data, return */
3148 if (tx->tlen - tx->coalesce_idx)
3151 /* Whole packet is received; add any padding */
3152 pad_len = tx->packet_len & (sizeof(u32) - 1);
3154 pad_len = sizeof(u32) - pad_len;
3155 memset(tx->coalesce_buf + tx->coalesce_idx, 0, pad_len);
3156 /* padding is taken care of for coalescing case */
3157 tx->packet_len += pad_len;
3158 tx->tlen += pad_len;
3161 /* dma map the coalesce buffer */
3162 addr = dma_map_single(&dd->pcidev->dev,
3167 if (unlikely(dma_mapping_error(&dd->pcidev->dev, addr))) {
3168 __sdma_txclean(dd, tx);
3172 /* Add descriptor for coalesce buffer */
3173 tx->desc_limit = MAX_DESC;
3174 return _sdma_txadd_daddr(dd, SDMA_MAP_SINGLE, tx,
3181 /* Update sdes when the lmc changes */
3182 void sdma_update_lmc(struct hfi1_devdata *dd, u64 mask, u32 lid)
3184 struct sdma_engine *sde;
3188 sreg = ((mask & SD(CHECK_SLID_MASK_MASK)) <<
3189 SD(CHECK_SLID_MASK_SHIFT)) |
3190 (((lid & mask) & SD(CHECK_SLID_VALUE_MASK)) <<
3191 SD(CHECK_SLID_VALUE_SHIFT));
3193 for (i = 0; i < dd->num_sdma; i++) {
3194 hfi1_cdbg(LINKVERB, "SendDmaEngine[%d].SLID_CHECK = 0x%x",
3196 sde = &dd->per_sdma[i];
3197 write_sde_csr(sde, SD(CHECK_SLID), sreg);
3201 /* tx not dword sized - pad */
3202 int _pad_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx)
3207 if ((unlikely(tx->num_desc == tx->desc_limit))) {
3208 rval = _extend_sdma_tx_descs(dd, tx);
3210 __sdma_txclean(dd, tx);
3214 /* finish the one just added */
3219 sizeof(u32) - (tx->packet_len & (sizeof(u32) - 1)));
3220 _sdma_close_tx(dd, tx);
3225 * Add ahg to the sdma_txreq
3227 * The logic will consume up to 3
3228 * descriptors at the beginning of
3231 void _sdma_txreq_ahgadd(
3232 struct sdma_txreq *tx,
3238 u32 i, shift = 0, desc = 0;
3241 WARN_ON_ONCE(num_ahg > 9 || (ahg_hlen & 3) || ahg_hlen == 4);
3244 mode = SDMA_AHG_APPLY_UPDATE1;
3245 else if (num_ahg <= 5)
3246 mode = SDMA_AHG_APPLY_UPDATE2;
3248 mode = SDMA_AHG_APPLY_UPDATE3;
3250 /* initialize to consumed descriptors to zero */
3252 case SDMA_AHG_APPLY_UPDATE3:
3254 tx->descs[2].qw[0] = 0;
3255 tx->descs[2].qw[1] = 0;
3257 case SDMA_AHG_APPLY_UPDATE2:
3259 tx->descs[1].qw[0] = 0;
3260 tx->descs[1].qw[1] = 0;
3264 tx->descs[0].qw[1] |=
3265 (((u64)ahg_entry & SDMA_DESC1_HEADER_INDEX_MASK)
3266 << SDMA_DESC1_HEADER_INDEX_SHIFT) |
3267 (((u64)ahg_hlen & SDMA_DESC1_HEADER_DWS_MASK)
3268 << SDMA_DESC1_HEADER_DWS_SHIFT) |
3269 (((u64)mode & SDMA_DESC1_HEADER_MODE_MASK)
3270 << SDMA_DESC1_HEADER_MODE_SHIFT) |
3271 (((u64)ahg[0] & SDMA_DESC1_HEADER_UPDATE1_MASK)
3272 << SDMA_DESC1_HEADER_UPDATE1_SHIFT);
3273 for (i = 0; i < (num_ahg - 1); i++) {
3274 if (!shift && !(i & 2))
3276 tx->descs[desc].qw[!!(i & 2)] |=
3279 shift = (shift + 32) & 63;
3284 * sdma_ahg_alloc - allocate an AHG entry
3285 * @sde: engine to allocate from
3288 * 0-31 when successful, -EOPNOTSUPP if AHG is not enabled,
3289 * -ENOSPC if an entry is not available
3291 int sdma_ahg_alloc(struct sdma_engine *sde)
3297 trace_hfi1_ahg_allocate(sde, -EINVAL);
3301 nr = ffz(READ_ONCE(sde->ahg_bits));
3303 trace_hfi1_ahg_allocate(sde, -ENOSPC);
3306 oldbit = test_and_set_bit(nr, &sde->ahg_bits);
3311 trace_hfi1_ahg_allocate(sde, nr);
3316 * sdma_ahg_free - free an AHG entry
3317 * @sde: engine to return AHG entry
3318 * @ahg_index: index to free
3320 * This routine frees the indicate AHG entry.
3322 void sdma_ahg_free(struct sdma_engine *sde, int ahg_index)
3326 trace_hfi1_ahg_deallocate(sde, ahg_index);
3327 if (ahg_index < 0 || ahg_index > 31)
3329 clear_bit(ahg_index, &sde->ahg_bits);
3333 * SPC freeze handling for SDMA engines. Called when the driver knows
3334 * the SPC is going into a freeze but before the freeze is fully
3335 * settled. Generally an error interrupt.
3337 * This event will pull the engine out of running so no more entries can be
3338 * added to the engine's queue.
3340 void sdma_freeze_notify(struct hfi1_devdata *dd, int link_down)
3343 enum sdma_events event = link_down ? sdma_event_e85_link_down :
3344 sdma_event_e80_hw_freeze;
3346 /* set up the wait but do not wait here */
3347 atomic_set(&dd->sdma_unfreeze_count, dd->num_sdma);
3349 /* tell all engines to stop running and wait */
3350 for (i = 0; i < dd->num_sdma; i++)
3351 sdma_process_event(&dd->per_sdma[i], event);
3353 /* sdma_freeze() will wait for all engines to have stopped */
3357 * SPC freeze handling for SDMA engines. Called when the driver knows
3358 * the SPC is fully frozen.
3360 void sdma_freeze(struct hfi1_devdata *dd)
3366 * Make sure all engines have moved out of the running state before
3369 ret = wait_event_interruptible(dd->sdma_unfreeze_wq,
3370 atomic_read(&dd->sdma_unfreeze_count) <=
3372 /* interrupted or count is negative, then unloading - just exit */
3373 if (ret || atomic_read(&dd->sdma_unfreeze_count) < 0)
3376 /* set up the count for the next wait */
3377 atomic_set(&dd->sdma_unfreeze_count, dd->num_sdma);
3379 /* tell all engines that the SPC is frozen, they can start cleaning */
3380 for (i = 0; i < dd->num_sdma; i++)
3381 sdma_process_event(&dd->per_sdma[i], sdma_event_e81_hw_frozen);
3384 * Wait for everyone to finish software clean before exiting. The
3385 * software clean will read engine CSRs, so must be completed before
3386 * the next step, which will clear the engine CSRs.
3388 (void)wait_event_interruptible(dd->sdma_unfreeze_wq,
3389 atomic_read(&dd->sdma_unfreeze_count) <= 0);
3390 /* no need to check results - done no matter what */
3394 * SPC freeze handling for the SDMA engines. Called after the SPC is unfrozen.
3396 * The SPC freeze acts like a SDMA halt and a hardware clean combined. All
3397 * that is left is a software clean. We could do it after the SPC is fully
3398 * frozen, but then we'd have to add another state to wait for the unfreeze.
3399 * Instead, just defer the software clean until the unfreeze step.
3401 void sdma_unfreeze(struct hfi1_devdata *dd)
3405 /* tell all engines start freeze clean up */
3406 for (i = 0; i < dd->num_sdma; i++)
3407 sdma_process_event(&dd->per_sdma[i],
3408 sdma_event_e82_hw_unfreeze);
3412 * _sdma_engine_progress_schedule() - schedule progress on engine
3413 * @sde: sdma_engine to schedule progress
3416 void _sdma_engine_progress_schedule(
3417 struct sdma_engine *sde)
3419 trace_hfi1_sdma_engine_progress(sde, sde->progress_mask);
3420 /* assume we have selected a good cpu */
3422 CCE_INT_FORCE + (8 * (IS_SDMA_START / 64)),
3423 sde->progress_mask);