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