1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
2 /*
3 * Copyright(c) 2015 - 2018 Intel Corporation.
4 */
5
6 #include <linux/spinlock.h>
7 #include <linux/seqlock.h>
8 #include <linux/netdevice.h>
9 #include <linux/moduleparam.h>
10 #include <linux/bitops.h>
11 #include <linux/timer.h>
12 #include <linux/vmalloc.h>
13 #include <linux/highmem.h>
14
15 #include "hfi.h"
16 #include "common.h"
17 #include "qp.h"
18 #include "sdma.h"
19 #include "iowait.h"
20 #include "trace.h"
21
22 /* must be a power of 2 >= 64 <= 32768 */
23 #define SDMA_DESCQ_CNT 2048
24 #define SDMA_DESC_INTR 64
25 #define INVALID_TAIL 0xffff
26 #define SDMA_PAD max_t(size_t, MAX_16B_PADDING, sizeof(u32))
27
28 static uint sdma_descq_cnt = SDMA_DESCQ_CNT;
29 module_param(sdma_descq_cnt, uint, S_IRUGO);
30 MODULE_PARM_DESC(sdma_descq_cnt, "Number of SDMA descq entries");
31
32 static uint sdma_idle_cnt = 250;
33 module_param(sdma_idle_cnt, uint, S_IRUGO);
34 MODULE_PARM_DESC(sdma_idle_cnt, "sdma interrupt idle delay (ns,default 250)");
35
36 uint mod_num_sdma;
37 module_param_named(num_sdma, mod_num_sdma, uint, S_IRUGO);
38 MODULE_PARM_DESC(num_sdma, "Set max number SDMA engines to use");
39
40 static uint sdma_desct_intr = SDMA_DESC_INTR;
41 module_param_named(desct_intr, sdma_desct_intr, uint, S_IRUGO | S_IWUSR);
42 MODULE_PARM_DESC(desct_intr, "Number of SDMA descriptor before interrupt");
43
44 #define SDMA_WAIT_BATCH_SIZE 20
45 /* max wait time for a SDMA engine to indicate it has halted */
46 #define SDMA_ERR_HALT_TIMEOUT 10 /* ms */
47 /* all SDMA engine errors that cause a halt */
48
49 #define SD(name) SEND_DMA_##name
50 #define ALL_SDMA_ENG_HALT_ERRS \
51 (SD(ENG_ERR_STATUS_SDMA_WRONG_DW_ERR_SMASK) \
52 | SD(ENG_ERR_STATUS_SDMA_GEN_MISMATCH_ERR_SMASK) \
53 | SD(ENG_ERR_STATUS_SDMA_TOO_LONG_ERR_SMASK) \
54 | SD(ENG_ERR_STATUS_SDMA_TAIL_OUT_OF_BOUNDS_ERR_SMASK) \
55 | SD(ENG_ERR_STATUS_SDMA_FIRST_DESC_ERR_SMASK) \
56 | SD(ENG_ERR_STATUS_SDMA_MEM_READ_ERR_SMASK) \
57 | SD(ENG_ERR_STATUS_SDMA_HALT_ERR_SMASK) \
58 | SD(ENG_ERR_STATUS_SDMA_LENGTH_MISMATCH_ERR_SMASK) \
59 | SD(ENG_ERR_STATUS_SDMA_PACKET_DESC_OVERFLOW_ERR_SMASK) \
60 | SD(ENG_ERR_STATUS_SDMA_HEADER_SELECT_ERR_SMASK) \
61 | SD(ENG_ERR_STATUS_SDMA_HEADER_ADDRESS_ERR_SMASK) \
62 | SD(ENG_ERR_STATUS_SDMA_HEADER_LENGTH_ERR_SMASK) \
63 | SD(ENG_ERR_STATUS_SDMA_TIMEOUT_ERR_SMASK) \
64 | SD(ENG_ERR_STATUS_SDMA_DESC_TABLE_UNC_ERR_SMASK) \
65 | SD(ENG_ERR_STATUS_SDMA_ASSEMBLY_UNC_ERR_SMASK) \
66 | SD(ENG_ERR_STATUS_SDMA_PACKET_TRACKING_UNC_ERR_SMASK) \
67 | SD(ENG_ERR_STATUS_SDMA_HEADER_STORAGE_UNC_ERR_SMASK) \
68 | SD(ENG_ERR_STATUS_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_SMASK))
69
70 /* sdma_sendctrl operations */
71 #define SDMA_SENDCTRL_OP_ENABLE BIT(0)
72 #define SDMA_SENDCTRL_OP_INTENABLE BIT(1)
73 #define SDMA_SENDCTRL_OP_HALT BIT(2)
74 #define SDMA_SENDCTRL_OP_CLEANUP BIT(3)
75
76 /* handle long defines */
77 #define SDMA_EGRESS_PACKET_OCCUPANCY_SMASK \
78 SEND_EGRESS_SEND_DMA_STATUS_SDMA_EGRESS_PACKET_OCCUPANCY_SMASK
79 #define SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT \
80 SEND_EGRESS_SEND_DMA_STATUS_SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT
81
82 static const char * const sdma_state_names[] = {
83 [sdma_state_s00_hw_down] = "s00_HwDown",
84 [sdma_state_s10_hw_start_up_halt_wait] = "s10_HwStartUpHaltWait",
85 [sdma_state_s15_hw_start_up_clean_wait] = "s15_HwStartUpCleanWait",
86 [sdma_state_s20_idle] = "s20_Idle",
87 [sdma_state_s30_sw_clean_up_wait] = "s30_SwCleanUpWait",
88 [sdma_state_s40_hw_clean_up_wait] = "s40_HwCleanUpWait",
89 [sdma_state_s50_hw_halt_wait] = "s50_HwHaltWait",
90 [sdma_state_s60_idle_halt_wait] = "s60_IdleHaltWait",
91 [sdma_state_s80_hw_freeze] = "s80_HwFreeze",
92 [sdma_state_s82_freeze_sw_clean] = "s82_FreezeSwClean",
93 [sdma_state_s99_running] = "s99_Running",
94 };
95
96 #ifdef CONFIG_SDMA_VERBOSITY
97 static const char * const sdma_event_names[] = {
98 [sdma_event_e00_go_hw_down] = "e00_GoHwDown",
99 [sdma_event_e10_go_hw_start] = "e10_GoHwStart",
100 [sdma_event_e15_hw_halt_done] = "e15_HwHaltDone",
101 [sdma_event_e25_hw_clean_up_done] = "e25_HwCleanUpDone",
102 [sdma_event_e30_go_running] = "e30_GoRunning",
103 [sdma_event_e40_sw_cleaned] = "e40_SwCleaned",
104 [sdma_event_e50_hw_cleaned] = "e50_HwCleaned",
105 [sdma_event_e60_hw_halted] = "e60_HwHalted",
106 [sdma_event_e70_go_idle] = "e70_GoIdle",
107 [sdma_event_e80_hw_freeze] = "e80_HwFreeze",
108 [sdma_event_e81_hw_frozen] = "e81_HwFrozen",
109 [sdma_event_e82_hw_unfreeze] = "e82_HwUnfreeze",
110 [sdma_event_e85_link_down] = "e85_LinkDown",
111 [sdma_event_e90_sw_halted] = "e90_SwHalted",
112 };
113 #endif
114
115 static const struct sdma_set_state_action sdma_action_table[] = {
116 [sdma_state_s00_hw_down] = {
117 .go_s99_running_tofalse = 1,
118 .op_enable = 0,
119 .op_intenable = 0,
120 .op_halt = 0,
121 .op_cleanup = 0,
122 },
123 [sdma_state_s10_hw_start_up_halt_wait] = {
124 .op_enable = 0,
125 .op_intenable = 0,
126 .op_halt = 1,
127 .op_cleanup = 0,
128 },
129 [sdma_state_s15_hw_start_up_clean_wait] = {
130 .op_enable = 0,
131 .op_intenable = 1,
132 .op_halt = 0,
133 .op_cleanup = 1,
134 },
135 [sdma_state_s20_idle] = {
136 .op_enable = 0,
137 .op_intenable = 1,
138 .op_halt = 0,
139 .op_cleanup = 0,
140 },
141 [sdma_state_s30_sw_clean_up_wait] = {
142 .op_enable = 0,
143 .op_intenable = 0,
144 .op_halt = 0,
145 .op_cleanup = 0,
146 },
147 [sdma_state_s40_hw_clean_up_wait] = {
148 .op_enable = 0,
149 .op_intenable = 0,
150 .op_halt = 0,
151 .op_cleanup = 1,
152 },
153 [sdma_state_s50_hw_halt_wait] = {
154 .op_enable = 0,
155 .op_intenable = 0,
156 .op_halt = 0,
157 .op_cleanup = 0,
158 },
159 [sdma_state_s60_idle_halt_wait] = {
160 .go_s99_running_tofalse = 1,
161 .op_enable = 0,
162 .op_intenable = 0,
163 .op_halt = 1,
164 .op_cleanup = 0,
165 },
166 [sdma_state_s80_hw_freeze] = {
167 .op_enable = 0,
168 .op_intenable = 0,
169 .op_halt = 0,
170 .op_cleanup = 0,
171 },
172 [sdma_state_s82_freeze_sw_clean] = {
173 .op_enable = 0,
174 .op_intenable = 0,
175 .op_halt = 0,
176 .op_cleanup = 0,
177 },
178 [sdma_state_s99_running] = {
179 .op_enable = 1,
180 .op_intenable = 1,
181 .op_halt = 0,
182 .op_cleanup = 0,
183 .go_s99_running_totrue = 1,
184 },
185 };
186
187 #define SDMA_TAIL_UPDATE_THRESH 0x1F
188
189 /* declare all statics here rather than keep sorting */
190 static void sdma_complete(struct kref *);
191 static void sdma_finalput(struct sdma_state *);
192 static void sdma_get(struct sdma_state *);
193 static void sdma_hw_clean_up_task(struct tasklet_struct *);
194 static void sdma_put(struct sdma_state *);
195 static void sdma_set_state(struct sdma_engine *, enum sdma_states);
196 static void sdma_start_hw_clean_up(struct sdma_engine *);
197 static void sdma_sw_clean_up_task(struct tasklet_struct *);
198 static void sdma_sendctrl(struct sdma_engine *, unsigned);
199 static void init_sdma_regs(struct sdma_engine *, u32, uint);
200 static void sdma_process_event(
201 struct sdma_engine *sde,
202 enum sdma_events event);
203 static void __sdma_process_event(
204 struct sdma_engine *sde,
205 enum sdma_events event);
206 static void dump_sdma_state(struct sdma_engine *sde);
207 static void sdma_make_progress(struct sdma_engine *sde, u64 status);
208 static void sdma_desc_avail(struct sdma_engine *sde, uint avail);
209 static void sdma_flush_descq(struct sdma_engine *sde);
210
211 /**
212 * sdma_state_name() - return state string from enum
213 * @state: state
214 */
sdma_state_name(enum sdma_states state)215 static const char *sdma_state_name(enum sdma_states state)
216 {
217 return sdma_state_names[state];
218 }
219
sdma_get(struct sdma_state * ss)220 static void sdma_get(struct sdma_state *ss)
221 {
222 kref_get(&ss->kref);
223 }
224
sdma_complete(struct kref * kref)225 static void sdma_complete(struct kref *kref)
226 {
227 struct sdma_state *ss =
228 container_of(kref, struct sdma_state, kref);
229
230 complete(&ss->comp);
231 }
232
sdma_put(struct sdma_state * ss)233 static void sdma_put(struct sdma_state *ss)
234 {
235 kref_put(&ss->kref, sdma_complete);
236 }
237
sdma_finalput(struct sdma_state * ss)238 static void sdma_finalput(struct sdma_state *ss)
239 {
240 sdma_put(ss);
241 wait_for_completion(&ss->comp);
242 }
243
write_sde_csr(struct sdma_engine * sde,u32 offset0,u64 value)244 static inline void write_sde_csr(
245 struct sdma_engine *sde,
246 u32 offset0,
247 u64 value)
248 {
249 write_kctxt_csr(sde->dd, sde->this_idx, offset0, value);
250 }
251
read_sde_csr(struct sdma_engine * sde,u32 offset0)252 static inline u64 read_sde_csr(
253 struct sdma_engine *sde,
254 u32 offset0)
255 {
256 return read_kctxt_csr(sde->dd, sde->this_idx, offset0);
257 }
258
259 /*
260 * sdma_wait_for_packet_egress() - wait for the VL FIFO occupancy for
261 * sdma engine 'sde' to drop to 0.
262 */
sdma_wait_for_packet_egress(struct sdma_engine * sde,int pause)263 static void sdma_wait_for_packet_egress(struct sdma_engine *sde,
264 int pause)
265 {
266 u64 off = 8 * sde->this_idx;
267 struct hfi1_devdata *dd = sde->dd;
268 int lcnt = 0;
269 u64 reg_prev;
270 u64 reg = 0;
271
272 while (1) {
273 reg_prev = reg;
274 reg = read_csr(dd, off + SEND_EGRESS_SEND_DMA_STATUS);
275
276 reg &= SDMA_EGRESS_PACKET_OCCUPANCY_SMASK;
277 reg >>= SDMA_EGRESS_PACKET_OCCUPANCY_SHIFT;
278 if (reg == 0)
279 break;
280 /* counter is reest if accupancy count changes */
281 if (reg != reg_prev)
282 lcnt = 0;
283 if (lcnt++ > 500) {
284 /* timed out - bounce the link */
285 dd_dev_err(dd, "%s: engine %u timeout waiting for packets to egress, remaining count %u, bouncing link\n",
286 __func__, sde->this_idx, (u32)reg);
287 queue_work(dd->pport->link_wq,
288 &dd->pport->link_bounce_work);
289 break;
290 }
291 udelay(1);
292 }
293 }
294
295 /*
296 * sdma_wait() - wait for packet egress to complete for all SDMA engines,
297 * and pause for credit return.
298 */
sdma_wait(struct hfi1_devdata * dd)299 void sdma_wait(struct hfi1_devdata *dd)
300 {
301 int i;
302
303 for (i = 0; i < dd->num_sdma; i++) {
304 struct sdma_engine *sde = &dd->per_sdma[i];
305
306 sdma_wait_for_packet_egress(sde, 0);
307 }
308 }
309
sdma_set_desc_cnt(struct sdma_engine * sde,unsigned cnt)310 static inline void sdma_set_desc_cnt(struct sdma_engine *sde, unsigned cnt)
311 {
312 u64 reg;
313
314 if (!(sde->dd->flags & HFI1_HAS_SDMA_TIMEOUT))
315 return;
316 reg = cnt;
317 reg &= SD(DESC_CNT_CNT_MASK);
318 reg <<= SD(DESC_CNT_CNT_SHIFT);
319 write_sde_csr(sde, SD(DESC_CNT), reg);
320 }
321
complete_tx(struct sdma_engine * sde,struct sdma_txreq * tx,int res)322 static inline void complete_tx(struct sdma_engine *sde,
323 struct sdma_txreq *tx,
324 int res)
325 {
326 /* protect against complete modifying */
327 struct iowait *wait = tx->wait;
328 callback_t complete = tx->complete;
329
330 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
331 trace_hfi1_sdma_out_sn(sde, tx->sn);
332 if (WARN_ON_ONCE(sde->head_sn != tx->sn))
333 dd_dev_err(sde->dd, "expected %llu got %llu\n",
334 sde->head_sn, tx->sn);
335 sde->head_sn++;
336 #endif
337 __sdma_txclean(sde->dd, tx);
338 if (complete)
339 (*complete)(tx, res);
340 if (iowait_sdma_dec(wait))
341 iowait_drain_wakeup(wait);
342 }
343
344 /*
345 * Complete all the sdma requests with a SDMA_TXREQ_S_ABORTED status
346 *
347 * Depending on timing there can be txreqs in two places:
348 * - in the descq ring
349 * - in the flush list
350 *
351 * To avoid ordering issues the descq ring needs to be flushed
352 * first followed by the flush list.
353 *
354 * This routine is called from two places
355 * - From a work queue item
356 * - Directly from the state machine just before setting the
357 * state to running
358 *
359 * Must be called with head_lock held
360 *
361 */
sdma_flush(struct sdma_engine * sde)362 static void sdma_flush(struct sdma_engine *sde)
363 {
364 struct sdma_txreq *txp, *txp_next;
365 LIST_HEAD(flushlist);
366 unsigned long flags;
367 uint seq;
368
369 /* flush from head to tail */
370 sdma_flush_descq(sde);
371 spin_lock_irqsave(&sde->flushlist_lock, flags);
372 /* copy flush list */
373 list_splice_init(&sde->flushlist, &flushlist);
374 spin_unlock_irqrestore(&sde->flushlist_lock, flags);
375 /* flush from flush list */
376 list_for_each_entry_safe(txp, txp_next, &flushlist, list)
377 complete_tx(sde, txp, SDMA_TXREQ_S_ABORTED);
378 /* wakeup QPs orphaned on the dmawait list */
379 do {
380 struct iowait *w, *nw;
381
382 seq = read_seqbegin(&sde->waitlock);
383 if (!list_empty(&sde->dmawait)) {
384 write_seqlock(&sde->waitlock);
385 list_for_each_entry_safe(w, nw, &sde->dmawait, list) {
386 if (w->wakeup) {
387 w->wakeup(w, SDMA_AVAIL_REASON);
388 list_del_init(&w->list);
389 }
390 }
391 write_sequnlock(&sde->waitlock);
392 }
393 } while (read_seqretry(&sde->waitlock, seq));
394 }
395
396 /*
397 * Fields a work request for flushing the descq ring
398 * and the flush list
399 *
400 * If the engine has been brought to running during
401 * the scheduling delay, the flush is ignored, assuming
402 * that the process of bringing the engine to running
403 * would have done this flush prior to going to running.
404 *
405 */
sdma_field_flush(struct work_struct * work)406 static void sdma_field_flush(struct work_struct *work)
407 {
408 unsigned long flags;
409 struct sdma_engine *sde =
410 container_of(work, struct sdma_engine, flush_worker);
411
412 write_seqlock_irqsave(&sde->head_lock, flags);
413 if (!__sdma_running(sde))
414 sdma_flush(sde);
415 write_sequnlock_irqrestore(&sde->head_lock, flags);
416 }
417
sdma_err_halt_wait(struct work_struct * work)418 static void sdma_err_halt_wait(struct work_struct *work)
419 {
420 struct sdma_engine *sde = container_of(work, struct sdma_engine,
421 err_halt_worker);
422 u64 statuscsr;
423 unsigned long timeout;
424
425 timeout = jiffies + msecs_to_jiffies(SDMA_ERR_HALT_TIMEOUT);
426 while (1) {
427 statuscsr = read_sde_csr(sde, SD(STATUS));
428 statuscsr &= SD(STATUS_ENG_HALTED_SMASK);
429 if (statuscsr)
430 break;
431 if (time_after(jiffies, timeout)) {
432 dd_dev_err(sde->dd,
433 "SDMA engine %d - timeout waiting for engine to halt\n",
434 sde->this_idx);
435 /*
436 * Continue anyway. This could happen if there was
437 * an uncorrectable error in the wrong spot.
438 */
439 break;
440 }
441 usleep_range(80, 120);
442 }
443
444 sdma_process_event(sde, sdma_event_e15_hw_halt_done);
445 }
446
sdma_err_progress_check_schedule(struct sdma_engine * sde)447 static void sdma_err_progress_check_schedule(struct sdma_engine *sde)
448 {
449 if (!is_bx(sde->dd) && HFI1_CAP_IS_KSET(SDMA_AHG)) {
450 unsigned index;
451 struct hfi1_devdata *dd = sde->dd;
452
453 for (index = 0; index < dd->num_sdma; index++) {
454 struct sdma_engine *curr_sdma = &dd->per_sdma[index];
455
456 if (curr_sdma != sde)
457 curr_sdma->progress_check_head =
458 curr_sdma->descq_head;
459 }
460 dd_dev_err(sde->dd,
461 "SDMA engine %d - check scheduled\n",
462 sde->this_idx);
463 mod_timer(&sde->err_progress_check_timer, jiffies + 10);
464 }
465 }
466
sdma_err_progress_check(struct timer_list * t)467 static void sdma_err_progress_check(struct timer_list *t)
468 {
469 unsigned index;
470 struct sdma_engine *sde = from_timer(sde, t, err_progress_check_timer);
471
472 dd_dev_err(sde->dd, "SDE progress check event\n");
473 for (index = 0; index < sde->dd->num_sdma; index++) {
474 struct sdma_engine *curr_sde = &sde->dd->per_sdma[index];
475 unsigned long flags;
476
477 /* check progress on each engine except the current one */
478 if (curr_sde == sde)
479 continue;
480 /*
481 * We must lock interrupts when acquiring sde->lock,
482 * to avoid a deadlock if interrupt triggers and spins on
483 * the same lock on same CPU
484 */
485 spin_lock_irqsave(&curr_sde->tail_lock, flags);
486 write_seqlock(&curr_sde->head_lock);
487
488 /* skip non-running queues */
489 if (curr_sde->state.current_state != sdma_state_s99_running) {
490 write_sequnlock(&curr_sde->head_lock);
491 spin_unlock_irqrestore(&curr_sde->tail_lock, flags);
492 continue;
493 }
494
495 if ((curr_sde->descq_head != curr_sde->descq_tail) &&
496 (curr_sde->descq_head ==
497 curr_sde->progress_check_head))
498 __sdma_process_event(curr_sde,
499 sdma_event_e90_sw_halted);
500 write_sequnlock(&curr_sde->head_lock);
501 spin_unlock_irqrestore(&curr_sde->tail_lock, flags);
502 }
503 schedule_work(&sde->err_halt_worker);
504 }
505
sdma_hw_clean_up_task(struct tasklet_struct * t)506 static void sdma_hw_clean_up_task(struct tasklet_struct *t)
507 {
508 struct sdma_engine *sde = from_tasklet(sde, t,
509 sdma_hw_clean_up_task);
510 u64 statuscsr;
511
512 while (1) {
513 #ifdef CONFIG_SDMA_VERBOSITY
514 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
515 sde->this_idx, slashstrip(__FILE__), __LINE__,
516 __func__);
517 #endif
518 statuscsr = read_sde_csr(sde, SD(STATUS));
519 statuscsr &= SD(STATUS_ENG_CLEANED_UP_SMASK);
520 if (statuscsr)
521 break;
522 udelay(10);
523 }
524
525 sdma_process_event(sde, sdma_event_e25_hw_clean_up_done);
526 }
527
get_txhead(struct sdma_engine * sde)528 static inline struct sdma_txreq *get_txhead(struct sdma_engine *sde)
529 {
530 return sde->tx_ring[sde->tx_head & sde->sdma_mask];
531 }
532
533 /*
534 * flush ring for recovery
535 */
sdma_flush_descq(struct sdma_engine * sde)536 static void sdma_flush_descq(struct sdma_engine *sde)
537 {
538 u16 head, tail;
539 int progress = 0;
540 struct sdma_txreq *txp = get_txhead(sde);
541
542 /* The reason for some of the complexity of this code is that
543 * not all descriptors have corresponding txps. So, we have to
544 * be able to skip over descs until we wander into the range of
545 * the next txp on the list.
546 */
547 head = sde->descq_head & sde->sdma_mask;
548 tail = sde->descq_tail & sde->sdma_mask;
549 while (head != tail) {
550 /* advance head, wrap if needed */
551 head = ++sde->descq_head & sde->sdma_mask;
552 /* if now past this txp's descs, do the callback */
553 if (txp && txp->next_descq_idx == head) {
554 /* remove from list */
555 sde->tx_ring[sde->tx_head++ & sde->sdma_mask] = NULL;
556 complete_tx(sde, txp, SDMA_TXREQ_S_ABORTED);
557 trace_hfi1_sdma_progress(sde, head, tail, txp);
558 txp = get_txhead(sde);
559 }
560 progress++;
561 }
562 if (progress)
563 sdma_desc_avail(sde, sdma_descq_freecnt(sde));
564 }
565
sdma_sw_clean_up_task(struct tasklet_struct * t)566 static void sdma_sw_clean_up_task(struct tasklet_struct *t)
567 {
568 struct sdma_engine *sde = from_tasklet(sde, t, sdma_sw_clean_up_task);
569 unsigned long flags;
570
571 spin_lock_irqsave(&sde->tail_lock, flags);
572 write_seqlock(&sde->head_lock);
573
574 /*
575 * At this point, the following should always be true:
576 * - We are halted, so no more descriptors are getting retired.
577 * - We are not running, so no one is submitting new work.
578 * - Only we can send the e40_sw_cleaned, so we can't start
579 * running again until we say so. So, the active list and
580 * descq are ours to play with.
581 */
582
583 /*
584 * In the error clean up sequence, software clean must be called
585 * before the hardware clean so we can use the hardware head in
586 * the progress routine. A hardware clean or SPC unfreeze will
587 * reset the hardware head.
588 *
589 * Process all retired requests. The progress routine will use the
590 * latest physical hardware head - we are not running so speed does
591 * not matter.
592 */
593 sdma_make_progress(sde, 0);
594
595 sdma_flush(sde);
596
597 /*
598 * Reset our notion of head and tail.
599 * Note that the HW registers have been reset via an earlier
600 * clean up.
601 */
602 sde->descq_tail = 0;
603 sde->descq_head = 0;
604 sde->desc_avail = sdma_descq_freecnt(sde);
605 *sde->head_dma = 0;
606
607 __sdma_process_event(sde, sdma_event_e40_sw_cleaned);
608
609 write_sequnlock(&sde->head_lock);
610 spin_unlock_irqrestore(&sde->tail_lock, flags);
611 }
612
sdma_sw_tear_down(struct sdma_engine * sde)613 static void sdma_sw_tear_down(struct sdma_engine *sde)
614 {
615 struct sdma_state *ss = &sde->state;
616
617 /* Releasing this reference means the state machine has stopped. */
618 sdma_put(ss);
619
620 /* stop waiting for all unfreeze events to complete */
621 atomic_set(&sde->dd->sdma_unfreeze_count, -1);
622 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
623 }
624
sdma_start_hw_clean_up(struct sdma_engine * sde)625 static void sdma_start_hw_clean_up(struct sdma_engine *sde)
626 {
627 tasklet_hi_schedule(&sde->sdma_hw_clean_up_task);
628 }
629
sdma_set_state(struct sdma_engine * sde,enum sdma_states next_state)630 static void sdma_set_state(struct sdma_engine *sde,
631 enum sdma_states next_state)
632 {
633 struct sdma_state *ss = &sde->state;
634 const struct sdma_set_state_action *action = sdma_action_table;
635 unsigned op = 0;
636
637 trace_hfi1_sdma_state(
638 sde,
639 sdma_state_names[ss->current_state],
640 sdma_state_names[next_state]);
641
642 /* debugging bookkeeping */
643 ss->previous_state = ss->current_state;
644 ss->previous_op = ss->current_op;
645 ss->current_state = next_state;
646
647 if (ss->previous_state != sdma_state_s99_running &&
648 next_state == sdma_state_s99_running)
649 sdma_flush(sde);
650
651 if (action[next_state].op_enable)
652 op |= SDMA_SENDCTRL_OP_ENABLE;
653
654 if (action[next_state].op_intenable)
655 op |= SDMA_SENDCTRL_OP_INTENABLE;
656
657 if (action[next_state].op_halt)
658 op |= SDMA_SENDCTRL_OP_HALT;
659
660 if (action[next_state].op_cleanup)
661 op |= SDMA_SENDCTRL_OP_CLEANUP;
662
663 if (action[next_state].go_s99_running_tofalse)
664 ss->go_s99_running = 0;
665
666 if (action[next_state].go_s99_running_totrue)
667 ss->go_s99_running = 1;
668
669 ss->current_op = op;
670 sdma_sendctrl(sde, ss->current_op);
671 }
672
673 /**
674 * sdma_get_descq_cnt() - called when device probed
675 *
676 * Return a validated descq count.
677 *
678 * This is currently only used in the verbs initialization to build the tx
679 * list.
680 *
681 * This will probably be deleted in favor of a more scalable approach to
682 * alloc tx's.
683 *
684 */
sdma_get_descq_cnt(void)685 u16 sdma_get_descq_cnt(void)
686 {
687 u16 count = sdma_descq_cnt;
688
689 if (!count)
690 return SDMA_DESCQ_CNT;
691 /* count must be a power of 2 greater than 64 and less than
692 * 32768. Otherwise return default.
693 */
694 if (!is_power_of_2(count))
695 return SDMA_DESCQ_CNT;
696 if (count < 64 || count > 32768)
697 return SDMA_DESCQ_CNT;
698 return count;
699 }
700
701 /**
702 * sdma_engine_get_vl() - return vl for a given sdma engine
703 * @sde: sdma engine
704 *
705 * This function returns the vl mapped to a given engine, or an error if
706 * the mapping can't be found. The mapping fields are protected by RCU.
707 */
sdma_engine_get_vl(struct sdma_engine * sde)708 int sdma_engine_get_vl(struct sdma_engine *sde)
709 {
710 struct hfi1_devdata *dd = sde->dd;
711 struct sdma_vl_map *m;
712 u8 vl;
713
714 if (sde->this_idx >= TXE_NUM_SDMA_ENGINES)
715 return -EINVAL;
716
717 rcu_read_lock();
718 m = rcu_dereference(dd->sdma_map);
719 if (unlikely(!m)) {
720 rcu_read_unlock();
721 return -EINVAL;
722 }
723 vl = m->engine_to_vl[sde->this_idx];
724 rcu_read_unlock();
725
726 return vl;
727 }
728
729 /**
730 * sdma_select_engine_vl() - select sdma engine
731 * @dd: devdata
732 * @selector: a spreading factor
733 * @vl: this vl
734 *
735 *
736 * This function returns an engine based on the selector and a vl. The
737 * mapping fields are protected by RCU.
738 */
sdma_select_engine_vl(struct hfi1_devdata * dd,u32 selector,u8 vl)739 struct sdma_engine *sdma_select_engine_vl(
740 struct hfi1_devdata *dd,
741 u32 selector,
742 u8 vl)
743 {
744 struct sdma_vl_map *m;
745 struct sdma_map_elem *e;
746 struct sdma_engine *rval;
747
748 /* NOTE This should only happen if SC->VL changed after the initial
749 * checks on the QP/AH
750 * Default will return engine 0 below
751 */
752 if (vl >= num_vls) {
753 rval = NULL;
754 goto done;
755 }
756
757 rcu_read_lock();
758 m = rcu_dereference(dd->sdma_map);
759 if (unlikely(!m)) {
760 rcu_read_unlock();
761 return &dd->per_sdma[0];
762 }
763 e = m->map[vl & m->mask];
764 rval = e->sde[selector & e->mask];
765 rcu_read_unlock();
766
767 done:
768 rval = !rval ? &dd->per_sdma[0] : rval;
769 trace_hfi1_sdma_engine_select(dd, selector, vl, rval->this_idx);
770 return rval;
771 }
772
773 /**
774 * sdma_select_engine_sc() - select sdma engine
775 * @dd: devdata
776 * @selector: a spreading factor
777 * @sc5: the 5 bit sc
778 *
779 *
780 * This function returns an engine based on the selector and an sc.
781 */
sdma_select_engine_sc(struct hfi1_devdata * dd,u32 selector,u8 sc5)782 struct sdma_engine *sdma_select_engine_sc(
783 struct hfi1_devdata *dd,
784 u32 selector,
785 u8 sc5)
786 {
787 u8 vl = sc_to_vlt(dd, sc5);
788
789 return sdma_select_engine_vl(dd, selector, vl);
790 }
791
792 struct sdma_rht_map_elem {
793 u32 mask;
794 u8 ctr;
795 struct sdma_engine *sde[];
796 };
797
798 struct sdma_rht_node {
799 unsigned long cpu_id;
800 struct sdma_rht_map_elem *map[HFI1_MAX_VLS_SUPPORTED];
801 struct rhash_head node;
802 };
803
804 #define NR_CPUS_HINT 192
805
806 static const struct rhashtable_params sdma_rht_params = {
807 .nelem_hint = NR_CPUS_HINT,
808 .head_offset = offsetof(struct sdma_rht_node, node),
809 .key_offset = offsetof(struct sdma_rht_node, cpu_id),
810 .key_len = sizeof_field(struct sdma_rht_node, cpu_id),
811 .max_size = NR_CPUS,
812 .min_size = 8,
813 .automatic_shrinking = true,
814 };
815
816 /*
817 * sdma_select_user_engine() - select sdma engine based on user setup
818 * @dd: devdata
819 * @selector: a spreading factor
820 * @vl: this vl
821 *
822 * This function returns an sdma engine for a user sdma request.
823 * User defined sdma engine affinity setting is honored when applicable,
824 * otherwise system default sdma engine mapping is used. To ensure correct
825 * ordering, the mapping from <selector, vl> to sde must remain unchanged.
826 */
sdma_select_user_engine(struct hfi1_devdata * dd,u32 selector,u8 vl)827 struct sdma_engine *sdma_select_user_engine(struct hfi1_devdata *dd,
828 u32 selector, u8 vl)
829 {
830 struct sdma_rht_node *rht_node;
831 struct sdma_engine *sde = NULL;
832 unsigned long cpu_id;
833
834 /*
835 * To ensure that always the same sdma engine(s) will be
836 * selected make sure the process is pinned to this CPU only.
837 */
838 if (current->nr_cpus_allowed != 1)
839 goto out;
840
841 rcu_read_lock();
842 cpu_id = smp_processor_id();
843 rht_node = rhashtable_lookup(dd->sdma_rht, &cpu_id,
844 sdma_rht_params);
845
846 if (rht_node && rht_node->map[vl]) {
847 struct sdma_rht_map_elem *map = rht_node->map[vl];
848
849 sde = map->sde[selector & map->mask];
850 }
851 rcu_read_unlock();
852
853 if (sde)
854 return sde;
855
856 out:
857 return sdma_select_engine_vl(dd, selector, vl);
858 }
859
sdma_populate_sde_map(struct sdma_rht_map_elem * map)860 static void sdma_populate_sde_map(struct sdma_rht_map_elem *map)
861 {
862 int i;
863
864 for (i = 0; i < roundup_pow_of_two(map->ctr ? : 1) - map->ctr; i++)
865 map->sde[map->ctr + i] = map->sde[i];
866 }
867
sdma_cleanup_sde_map(struct sdma_rht_map_elem * map,struct sdma_engine * sde)868 static void sdma_cleanup_sde_map(struct sdma_rht_map_elem *map,
869 struct sdma_engine *sde)
870 {
871 unsigned int i, pow;
872
873 /* only need to check the first ctr entries for a match */
874 for (i = 0; i < map->ctr; i++) {
875 if (map->sde[i] == sde) {
876 memmove(&map->sde[i], &map->sde[i + 1],
877 (map->ctr - i - 1) * sizeof(map->sde[0]));
878 map->ctr--;
879 pow = roundup_pow_of_two(map->ctr ? : 1);
880 map->mask = pow - 1;
881 sdma_populate_sde_map(map);
882 break;
883 }
884 }
885 }
886
887 /*
888 * Prevents concurrent reads and writes of the sdma engine cpu_mask
889 */
890 static DEFINE_MUTEX(process_to_sde_mutex);
891
sdma_set_cpu_to_sde_map(struct sdma_engine * sde,const char * buf,size_t count)892 ssize_t sdma_set_cpu_to_sde_map(struct sdma_engine *sde, const char *buf,
893 size_t count)
894 {
895 struct hfi1_devdata *dd = sde->dd;
896 cpumask_var_t mask, new_mask;
897 unsigned long cpu;
898 int ret, vl, sz;
899 struct sdma_rht_node *rht_node;
900
901 vl = sdma_engine_get_vl(sde);
902 if (unlikely(vl < 0 || vl >= ARRAY_SIZE(rht_node->map)))
903 return -EINVAL;
904
905 ret = zalloc_cpumask_var(&mask, GFP_KERNEL);
906 if (!ret)
907 return -ENOMEM;
908
909 ret = zalloc_cpumask_var(&new_mask, GFP_KERNEL);
910 if (!ret) {
911 free_cpumask_var(mask);
912 return -ENOMEM;
913 }
914 ret = cpulist_parse(buf, mask);
915 if (ret)
916 goto out_free;
917
918 if (!cpumask_subset(mask, cpu_online_mask)) {
919 dd_dev_warn(sde->dd, "Invalid CPU mask\n");
920 ret = -EINVAL;
921 goto out_free;
922 }
923
924 sz = sizeof(struct sdma_rht_map_elem) +
925 (TXE_NUM_SDMA_ENGINES * sizeof(struct sdma_engine *));
926
927 mutex_lock(&process_to_sde_mutex);
928
929 for_each_cpu(cpu, mask) {
930 /* Check if we have this already mapped */
931 if (cpumask_test_cpu(cpu, &sde->cpu_mask)) {
932 cpumask_set_cpu(cpu, new_mask);
933 continue;
934 }
935
936 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpu,
937 sdma_rht_params);
938 if (!rht_node) {
939 rht_node = kzalloc(sizeof(*rht_node), GFP_KERNEL);
940 if (!rht_node) {
941 ret = -ENOMEM;
942 goto out;
943 }
944
945 rht_node->map[vl] = kzalloc(sz, GFP_KERNEL);
946 if (!rht_node->map[vl]) {
947 kfree(rht_node);
948 ret = -ENOMEM;
949 goto out;
950 }
951 rht_node->cpu_id = cpu;
952 rht_node->map[vl]->mask = 0;
953 rht_node->map[vl]->ctr = 1;
954 rht_node->map[vl]->sde[0] = sde;
955
956 ret = rhashtable_insert_fast(dd->sdma_rht,
957 &rht_node->node,
958 sdma_rht_params);
959 if (ret) {
960 kfree(rht_node->map[vl]);
961 kfree(rht_node);
962 dd_dev_err(sde->dd, "Failed to set process to sde affinity for cpu %lu\n",
963 cpu);
964 goto out;
965 }
966
967 } else {
968 int ctr, pow;
969
970 /* Add new user mappings */
971 if (!rht_node->map[vl])
972 rht_node->map[vl] = kzalloc(sz, GFP_KERNEL);
973
974 if (!rht_node->map[vl]) {
975 ret = -ENOMEM;
976 goto out;
977 }
978
979 rht_node->map[vl]->ctr++;
980 ctr = rht_node->map[vl]->ctr;
981 rht_node->map[vl]->sde[ctr - 1] = sde;
982 pow = roundup_pow_of_two(ctr);
983 rht_node->map[vl]->mask = pow - 1;
984
985 /* Populate the sde map table */
986 sdma_populate_sde_map(rht_node->map[vl]);
987 }
988 cpumask_set_cpu(cpu, new_mask);
989 }
990
991 /* Clean up old mappings */
992 for_each_cpu(cpu, cpu_online_mask) {
993 struct sdma_rht_node *rht_node;
994
995 /* Don't cleanup sdes that are set in the new mask */
996 if (cpumask_test_cpu(cpu, mask))
997 continue;
998
999 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpu,
1000 sdma_rht_params);
1001 if (rht_node) {
1002 bool empty = true;
1003 int i;
1004
1005 /* Remove mappings for old sde */
1006 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++)
1007 if (rht_node->map[i])
1008 sdma_cleanup_sde_map(rht_node->map[i],
1009 sde);
1010
1011 /* Free empty hash table entries */
1012 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) {
1013 if (!rht_node->map[i])
1014 continue;
1015
1016 if (rht_node->map[i]->ctr) {
1017 empty = false;
1018 break;
1019 }
1020 }
1021
1022 if (empty) {
1023 ret = rhashtable_remove_fast(dd->sdma_rht,
1024 &rht_node->node,
1025 sdma_rht_params);
1026 WARN_ON(ret);
1027
1028 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++)
1029 kfree(rht_node->map[i]);
1030
1031 kfree(rht_node);
1032 }
1033 }
1034 }
1035
1036 cpumask_copy(&sde->cpu_mask, new_mask);
1037 out:
1038 mutex_unlock(&process_to_sde_mutex);
1039 out_free:
1040 free_cpumask_var(mask);
1041 free_cpumask_var(new_mask);
1042 return ret ? : strnlen(buf, PAGE_SIZE);
1043 }
1044
sdma_get_cpu_to_sde_map(struct sdma_engine * sde,char * buf)1045 ssize_t sdma_get_cpu_to_sde_map(struct sdma_engine *sde, char *buf)
1046 {
1047 mutex_lock(&process_to_sde_mutex);
1048 if (cpumask_empty(&sde->cpu_mask))
1049 snprintf(buf, PAGE_SIZE, "%s\n", "empty");
1050 else
1051 cpumap_print_to_pagebuf(true, buf, &sde->cpu_mask);
1052 mutex_unlock(&process_to_sde_mutex);
1053 return strnlen(buf, PAGE_SIZE);
1054 }
1055
sdma_rht_free(void * ptr,void * arg)1056 static void sdma_rht_free(void *ptr, void *arg)
1057 {
1058 struct sdma_rht_node *rht_node = ptr;
1059 int i;
1060
1061 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++)
1062 kfree(rht_node->map[i]);
1063
1064 kfree(rht_node);
1065 }
1066
1067 /**
1068 * sdma_seqfile_dump_cpu_list() - debugfs dump the cpu to sdma mappings
1069 * @s: seq file
1070 * @dd: hfi1_devdata
1071 * @cpuid: cpu id
1072 *
1073 * This routine dumps the process to sde mappings per cpu
1074 */
sdma_seqfile_dump_cpu_list(struct seq_file * s,struct hfi1_devdata * dd,unsigned long cpuid)1075 void sdma_seqfile_dump_cpu_list(struct seq_file *s,
1076 struct hfi1_devdata *dd,
1077 unsigned long cpuid)
1078 {
1079 struct sdma_rht_node *rht_node;
1080 int i, j;
1081
1082 rht_node = rhashtable_lookup_fast(dd->sdma_rht, &cpuid,
1083 sdma_rht_params);
1084 if (!rht_node)
1085 return;
1086
1087 seq_printf(s, "cpu%3lu: ", cpuid);
1088 for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) {
1089 if (!rht_node->map[i] || !rht_node->map[i]->ctr)
1090 continue;
1091
1092 seq_printf(s, " vl%d: [", i);
1093
1094 for (j = 0; j < rht_node->map[i]->ctr; j++) {
1095 if (!rht_node->map[i]->sde[j])
1096 continue;
1097
1098 if (j > 0)
1099 seq_puts(s, ",");
1100
1101 seq_printf(s, " sdma%2d",
1102 rht_node->map[i]->sde[j]->this_idx);
1103 }
1104 seq_puts(s, " ]");
1105 }
1106
1107 seq_puts(s, "\n");
1108 }
1109
1110 /*
1111 * Free the indicated map struct
1112 */
sdma_map_free(struct sdma_vl_map * m)1113 static void sdma_map_free(struct sdma_vl_map *m)
1114 {
1115 int i;
1116
1117 for (i = 0; m && i < m->actual_vls; i++)
1118 kfree(m->map[i]);
1119 kfree(m);
1120 }
1121
1122 /*
1123 * Handle RCU callback
1124 */
sdma_map_rcu_callback(struct rcu_head * list)1125 static void sdma_map_rcu_callback(struct rcu_head *list)
1126 {
1127 struct sdma_vl_map *m = container_of(list, struct sdma_vl_map, list);
1128
1129 sdma_map_free(m);
1130 }
1131
1132 /**
1133 * sdma_map_init - called when # vls change
1134 * @dd: hfi1_devdata
1135 * @port: port number
1136 * @num_vls: number of vls
1137 * @vl_engines: per vl engine mapping (optional)
1138 *
1139 * This routine changes the mapping based on the number of vls.
1140 *
1141 * vl_engines is used to specify a non-uniform vl/engine loading. NULL
1142 * implies auto computing the loading and giving each VLs a uniform
1143 * distribution of engines per VL.
1144 *
1145 * The auto algorithm computes the sde_per_vl and the number of extra
1146 * engines. Any extra engines are added from the last VL on down.
1147 *
1148 * rcu locking is used here to control access to the mapping fields.
1149 *
1150 * If either the num_vls or num_sdma are non-power of 2, the array sizes
1151 * in the struct sdma_vl_map and the struct sdma_map_elem are rounded
1152 * up to the next highest power of 2 and the first entry is reused
1153 * in a round robin fashion.
1154 *
1155 * If an error occurs the map change is not done and the mapping is
1156 * not changed.
1157 *
1158 */
sdma_map_init(struct hfi1_devdata * dd,u8 port,u8 num_vls,u8 * vl_engines)1159 int sdma_map_init(struct hfi1_devdata *dd, u8 port, u8 num_vls, u8 *vl_engines)
1160 {
1161 int i, j;
1162 int extra, sde_per_vl;
1163 int engine = 0;
1164 u8 lvl_engines[OPA_MAX_VLS];
1165 struct sdma_vl_map *oldmap, *newmap;
1166
1167 if (!(dd->flags & HFI1_HAS_SEND_DMA))
1168 return 0;
1169
1170 if (!vl_engines) {
1171 /* truncate divide */
1172 sde_per_vl = dd->num_sdma / num_vls;
1173 /* extras */
1174 extra = dd->num_sdma % num_vls;
1175 vl_engines = lvl_engines;
1176 /* add extras from last vl down */
1177 for (i = num_vls - 1; i >= 0; i--, extra--)
1178 vl_engines[i] = sde_per_vl + (extra > 0 ? 1 : 0);
1179 }
1180 /* build new map */
1181 newmap = kzalloc(
1182 sizeof(struct sdma_vl_map) +
1183 roundup_pow_of_two(num_vls) *
1184 sizeof(struct sdma_map_elem *),
1185 GFP_KERNEL);
1186 if (!newmap)
1187 goto bail;
1188 newmap->actual_vls = num_vls;
1189 newmap->vls = roundup_pow_of_two(num_vls);
1190 newmap->mask = (1 << ilog2(newmap->vls)) - 1;
1191 /* initialize back-map */
1192 for (i = 0; i < TXE_NUM_SDMA_ENGINES; i++)
1193 newmap->engine_to_vl[i] = -1;
1194 for (i = 0; i < newmap->vls; i++) {
1195 /* save for wrap around */
1196 int first_engine = engine;
1197
1198 if (i < newmap->actual_vls) {
1199 int sz = roundup_pow_of_two(vl_engines[i]);
1200
1201 /* only allocate once */
1202 newmap->map[i] = kzalloc(
1203 sizeof(struct sdma_map_elem) +
1204 sz * sizeof(struct sdma_engine *),
1205 GFP_KERNEL);
1206 if (!newmap->map[i])
1207 goto bail;
1208 newmap->map[i]->mask = (1 << ilog2(sz)) - 1;
1209 /* assign engines */
1210 for (j = 0; j < sz; j++) {
1211 newmap->map[i]->sde[j] =
1212 &dd->per_sdma[engine];
1213 if (++engine >= first_engine + vl_engines[i])
1214 /* wrap back to first engine */
1215 engine = first_engine;
1216 }
1217 /* assign back-map */
1218 for (j = 0; j < vl_engines[i]; j++)
1219 newmap->engine_to_vl[first_engine + j] = i;
1220 } else {
1221 /* just re-use entry without allocating */
1222 newmap->map[i] = newmap->map[i % num_vls];
1223 }
1224 engine = first_engine + vl_engines[i];
1225 }
1226 /* newmap in hand, save old map */
1227 spin_lock_irq(&dd->sde_map_lock);
1228 oldmap = rcu_dereference_protected(dd->sdma_map,
1229 lockdep_is_held(&dd->sde_map_lock));
1230
1231 /* publish newmap */
1232 rcu_assign_pointer(dd->sdma_map, newmap);
1233
1234 spin_unlock_irq(&dd->sde_map_lock);
1235 /* success, free any old map after grace period */
1236 if (oldmap)
1237 call_rcu(&oldmap->list, sdma_map_rcu_callback);
1238 return 0;
1239 bail:
1240 /* free any partial allocation */
1241 sdma_map_free(newmap);
1242 return -ENOMEM;
1243 }
1244
1245 /**
1246 * sdma_clean - Clean up allocated memory
1247 * @dd: struct hfi1_devdata
1248 * @num_engines: num sdma engines
1249 *
1250 * This routine can be called regardless of the success of
1251 * sdma_init()
1252 */
sdma_clean(struct hfi1_devdata * dd,size_t num_engines)1253 void sdma_clean(struct hfi1_devdata *dd, size_t num_engines)
1254 {
1255 size_t i;
1256 struct sdma_engine *sde;
1257
1258 if (dd->sdma_pad_dma) {
1259 dma_free_coherent(&dd->pcidev->dev, SDMA_PAD,
1260 (void *)dd->sdma_pad_dma,
1261 dd->sdma_pad_phys);
1262 dd->sdma_pad_dma = NULL;
1263 dd->sdma_pad_phys = 0;
1264 }
1265 if (dd->sdma_heads_dma) {
1266 dma_free_coherent(&dd->pcidev->dev, dd->sdma_heads_size,
1267 (void *)dd->sdma_heads_dma,
1268 dd->sdma_heads_phys);
1269 dd->sdma_heads_dma = NULL;
1270 dd->sdma_heads_phys = 0;
1271 }
1272 for (i = 0; dd->per_sdma && i < num_engines; ++i) {
1273 sde = &dd->per_sdma[i];
1274
1275 sde->head_dma = NULL;
1276 sde->head_phys = 0;
1277
1278 if (sde->descq) {
1279 dma_free_coherent(
1280 &dd->pcidev->dev,
1281 sde->descq_cnt * sizeof(u64[2]),
1282 sde->descq,
1283 sde->descq_phys
1284 );
1285 sde->descq = NULL;
1286 sde->descq_phys = 0;
1287 }
1288 kvfree(sde->tx_ring);
1289 sde->tx_ring = NULL;
1290 }
1291 if (rcu_access_pointer(dd->sdma_map)) {
1292 spin_lock_irq(&dd->sde_map_lock);
1293 sdma_map_free(rcu_access_pointer(dd->sdma_map));
1294 RCU_INIT_POINTER(dd->sdma_map, NULL);
1295 spin_unlock_irq(&dd->sde_map_lock);
1296 synchronize_rcu();
1297 }
1298 kfree(dd->per_sdma);
1299 dd->per_sdma = NULL;
1300
1301 if (dd->sdma_rht) {
1302 rhashtable_free_and_destroy(dd->sdma_rht, sdma_rht_free, NULL);
1303 kfree(dd->sdma_rht);
1304 dd->sdma_rht = NULL;
1305 }
1306 }
1307
1308 /**
1309 * sdma_init() - called when device probed
1310 * @dd: hfi1_devdata
1311 * @port: port number (currently only zero)
1312 *
1313 * Initializes each sde and its csrs.
1314 * Interrupts are not required to be enabled.
1315 *
1316 * Returns:
1317 * 0 - success, -errno on failure
1318 */
sdma_init(struct hfi1_devdata * dd,u8 port)1319 int sdma_init(struct hfi1_devdata *dd, u8 port)
1320 {
1321 unsigned this_idx;
1322 struct sdma_engine *sde;
1323 struct rhashtable *tmp_sdma_rht;
1324 u16 descq_cnt;
1325 void *curr_head;
1326 struct hfi1_pportdata *ppd = dd->pport + port;
1327 u32 per_sdma_credits;
1328 uint idle_cnt = sdma_idle_cnt;
1329 size_t num_engines = chip_sdma_engines(dd);
1330 int ret = -ENOMEM;
1331
1332 if (!HFI1_CAP_IS_KSET(SDMA)) {
1333 HFI1_CAP_CLEAR(SDMA_AHG);
1334 return 0;
1335 }
1336 if (mod_num_sdma &&
1337 /* can't exceed chip support */
1338 mod_num_sdma <= chip_sdma_engines(dd) &&
1339 /* count must be >= vls */
1340 mod_num_sdma >= num_vls)
1341 num_engines = mod_num_sdma;
1342
1343 dd_dev_info(dd, "SDMA mod_num_sdma: %u\n", mod_num_sdma);
1344 dd_dev_info(dd, "SDMA chip_sdma_engines: %u\n", chip_sdma_engines(dd));
1345 dd_dev_info(dd, "SDMA chip_sdma_mem_size: %u\n",
1346 chip_sdma_mem_size(dd));
1347
1348 per_sdma_credits =
1349 chip_sdma_mem_size(dd) / (num_engines * SDMA_BLOCK_SIZE);
1350
1351 /* set up freeze waitqueue */
1352 init_waitqueue_head(&dd->sdma_unfreeze_wq);
1353 atomic_set(&dd->sdma_unfreeze_count, 0);
1354
1355 descq_cnt = sdma_get_descq_cnt();
1356 dd_dev_info(dd, "SDMA engines %zu descq_cnt %u\n",
1357 num_engines, descq_cnt);
1358
1359 /* alloc memory for array of send engines */
1360 dd->per_sdma = kcalloc_node(num_engines, sizeof(*dd->per_sdma),
1361 GFP_KERNEL, dd->node);
1362 if (!dd->per_sdma)
1363 return ret;
1364
1365 idle_cnt = ns_to_cclock(dd, idle_cnt);
1366 if (idle_cnt)
1367 dd->default_desc1 =
1368 SDMA_DESC1_HEAD_TO_HOST_FLAG;
1369 else
1370 dd->default_desc1 =
1371 SDMA_DESC1_INT_REQ_FLAG;
1372
1373 if (!sdma_desct_intr)
1374 sdma_desct_intr = SDMA_DESC_INTR;
1375
1376 /* Allocate memory for SendDMA descriptor FIFOs */
1377 for (this_idx = 0; this_idx < num_engines; ++this_idx) {
1378 sde = &dd->per_sdma[this_idx];
1379 sde->dd = dd;
1380 sde->ppd = ppd;
1381 sde->this_idx = this_idx;
1382 sde->descq_cnt = descq_cnt;
1383 sde->desc_avail = sdma_descq_freecnt(sde);
1384 sde->sdma_shift = ilog2(descq_cnt);
1385 sde->sdma_mask = (1 << sde->sdma_shift) - 1;
1386
1387 /* Create a mask specifically for each interrupt source */
1388 sde->int_mask = (u64)1 << (0 * TXE_NUM_SDMA_ENGINES +
1389 this_idx);
1390 sde->progress_mask = (u64)1 << (1 * TXE_NUM_SDMA_ENGINES +
1391 this_idx);
1392 sde->idle_mask = (u64)1 << (2 * TXE_NUM_SDMA_ENGINES +
1393 this_idx);
1394 /* Create a combined mask to cover all 3 interrupt sources */
1395 sde->imask = sde->int_mask | sde->progress_mask |
1396 sde->idle_mask;
1397
1398 spin_lock_init(&sde->tail_lock);
1399 seqlock_init(&sde->head_lock);
1400 spin_lock_init(&sde->senddmactrl_lock);
1401 spin_lock_init(&sde->flushlist_lock);
1402 seqlock_init(&sde->waitlock);
1403 /* insure there is always a zero bit */
1404 sde->ahg_bits = 0xfffffffe00000000ULL;
1405
1406 sdma_set_state(sde, sdma_state_s00_hw_down);
1407
1408 /* set up reference counting */
1409 kref_init(&sde->state.kref);
1410 init_completion(&sde->state.comp);
1411
1412 INIT_LIST_HEAD(&sde->flushlist);
1413 INIT_LIST_HEAD(&sde->dmawait);
1414
1415 sde->tail_csr =
1416 get_kctxt_csr_addr(dd, this_idx, SD(TAIL));
1417
1418 tasklet_setup(&sde->sdma_hw_clean_up_task,
1419 sdma_hw_clean_up_task);
1420 tasklet_setup(&sde->sdma_sw_clean_up_task,
1421 sdma_sw_clean_up_task);
1422 INIT_WORK(&sde->err_halt_worker, sdma_err_halt_wait);
1423 INIT_WORK(&sde->flush_worker, sdma_field_flush);
1424
1425 sde->progress_check_head = 0;
1426
1427 timer_setup(&sde->err_progress_check_timer,
1428 sdma_err_progress_check, 0);
1429
1430 sde->descq = dma_alloc_coherent(&dd->pcidev->dev,
1431 descq_cnt * sizeof(u64[2]),
1432 &sde->descq_phys, GFP_KERNEL);
1433 if (!sde->descq)
1434 goto bail;
1435 sde->tx_ring =
1436 kvzalloc_node(array_size(descq_cnt,
1437 sizeof(struct sdma_txreq *)),
1438 GFP_KERNEL, dd->node);
1439 if (!sde->tx_ring)
1440 goto bail;
1441 }
1442
1443 dd->sdma_heads_size = L1_CACHE_BYTES * num_engines;
1444 /* Allocate memory for DMA of head registers to memory */
1445 dd->sdma_heads_dma = dma_alloc_coherent(&dd->pcidev->dev,
1446 dd->sdma_heads_size,
1447 &dd->sdma_heads_phys,
1448 GFP_KERNEL);
1449 if (!dd->sdma_heads_dma) {
1450 dd_dev_err(dd, "failed to allocate SendDMA head memory\n");
1451 goto bail;
1452 }
1453
1454 /* Allocate memory for pad */
1455 dd->sdma_pad_dma = dma_alloc_coherent(&dd->pcidev->dev, SDMA_PAD,
1456 &dd->sdma_pad_phys, GFP_KERNEL);
1457 if (!dd->sdma_pad_dma) {
1458 dd_dev_err(dd, "failed to allocate SendDMA pad memory\n");
1459 goto bail;
1460 }
1461
1462 /* assign each engine to different cacheline and init registers */
1463 curr_head = (void *)dd->sdma_heads_dma;
1464 for (this_idx = 0; this_idx < num_engines; ++this_idx) {
1465 unsigned long phys_offset;
1466
1467 sde = &dd->per_sdma[this_idx];
1468
1469 sde->head_dma = curr_head;
1470 curr_head += L1_CACHE_BYTES;
1471 phys_offset = (unsigned long)sde->head_dma -
1472 (unsigned long)dd->sdma_heads_dma;
1473 sde->head_phys = dd->sdma_heads_phys + phys_offset;
1474 init_sdma_regs(sde, per_sdma_credits, idle_cnt);
1475 }
1476 dd->flags |= HFI1_HAS_SEND_DMA;
1477 dd->flags |= idle_cnt ? HFI1_HAS_SDMA_TIMEOUT : 0;
1478 dd->num_sdma = num_engines;
1479 ret = sdma_map_init(dd, port, ppd->vls_operational, NULL);
1480 if (ret < 0)
1481 goto bail;
1482
1483 tmp_sdma_rht = kzalloc(sizeof(*tmp_sdma_rht), GFP_KERNEL);
1484 if (!tmp_sdma_rht) {
1485 ret = -ENOMEM;
1486 goto bail;
1487 }
1488
1489 ret = rhashtable_init(tmp_sdma_rht, &sdma_rht_params);
1490 if (ret < 0) {
1491 kfree(tmp_sdma_rht);
1492 goto bail;
1493 }
1494
1495 dd->sdma_rht = tmp_sdma_rht;
1496
1497 dd_dev_info(dd, "SDMA num_sdma: %u\n", dd->num_sdma);
1498 return 0;
1499
1500 bail:
1501 sdma_clean(dd, num_engines);
1502 return ret;
1503 }
1504
1505 /**
1506 * sdma_all_running() - called when the link goes up
1507 * @dd: hfi1_devdata
1508 *
1509 * This routine moves all engines to the running state.
1510 */
sdma_all_running(struct hfi1_devdata * dd)1511 void sdma_all_running(struct hfi1_devdata *dd)
1512 {
1513 struct sdma_engine *sde;
1514 unsigned int i;
1515
1516 /* move all engines to running */
1517 for (i = 0; i < dd->num_sdma; ++i) {
1518 sde = &dd->per_sdma[i];
1519 sdma_process_event(sde, sdma_event_e30_go_running);
1520 }
1521 }
1522
1523 /**
1524 * sdma_all_idle() - called when the link goes down
1525 * @dd: hfi1_devdata
1526 *
1527 * This routine moves all engines to the idle state.
1528 */
sdma_all_idle(struct hfi1_devdata * dd)1529 void sdma_all_idle(struct hfi1_devdata *dd)
1530 {
1531 struct sdma_engine *sde;
1532 unsigned int i;
1533
1534 /* idle all engines */
1535 for (i = 0; i < dd->num_sdma; ++i) {
1536 sde = &dd->per_sdma[i];
1537 sdma_process_event(sde, sdma_event_e70_go_idle);
1538 }
1539 }
1540
1541 /**
1542 * sdma_start() - called to kick off state processing for all engines
1543 * @dd: hfi1_devdata
1544 *
1545 * This routine is for kicking off the state processing for all required
1546 * sdma engines. Interrupts need to be working at this point.
1547 *
1548 */
sdma_start(struct hfi1_devdata * dd)1549 void sdma_start(struct hfi1_devdata *dd)
1550 {
1551 unsigned i;
1552 struct sdma_engine *sde;
1553
1554 /* kick off the engines state processing */
1555 for (i = 0; i < dd->num_sdma; ++i) {
1556 sde = &dd->per_sdma[i];
1557 sdma_process_event(sde, sdma_event_e10_go_hw_start);
1558 }
1559 }
1560
1561 /**
1562 * sdma_exit() - used when module is removed
1563 * @dd: hfi1_devdata
1564 */
sdma_exit(struct hfi1_devdata * dd)1565 void sdma_exit(struct hfi1_devdata *dd)
1566 {
1567 unsigned this_idx;
1568 struct sdma_engine *sde;
1569
1570 for (this_idx = 0; dd->per_sdma && this_idx < dd->num_sdma;
1571 ++this_idx) {
1572 sde = &dd->per_sdma[this_idx];
1573 if (!list_empty(&sde->dmawait))
1574 dd_dev_err(dd, "sde %u: dmawait list not empty!\n",
1575 sde->this_idx);
1576 sdma_process_event(sde, sdma_event_e00_go_hw_down);
1577
1578 del_timer_sync(&sde->err_progress_check_timer);
1579
1580 /*
1581 * This waits for the state machine to exit so it is not
1582 * necessary to kill the sdma_sw_clean_up_task to make sure
1583 * it is not running.
1584 */
1585 sdma_finalput(&sde->state);
1586 }
1587 }
1588
1589 /*
1590 * unmap the indicated descriptor
1591 */
sdma_unmap_desc(struct hfi1_devdata * dd,struct sdma_desc * descp)1592 static inline void sdma_unmap_desc(
1593 struct hfi1_devdata *dd,
1594 struct sdma_desc *descp)
1595 {
1596 switch (sdma_mapping_type(descp)) {
1597 case SDMA_MAP_SINGLE:
1598 dma_unmap_single(&dd->pcidev->dev, sdma_mapping_addr(descp),
1599 sdma_mapping_len(descp), DMA_TO_DEVICE);
1600 break;
1601 case SDMA_MAP_PAGE:
1602 dma_unmap_page(&dd->pcidev->dev, sdma_mapping_addr(descp),
1603 sdma_mapping_len(descp), DMA_TO_DEVICE);
1604 break;
1605 }
1606
1607 if (descp->pinning_ctx && descp->ctx_put)
1608 descp->ctx_put(descp->pinning_ctx);
1609 descp->pinning_ctx = NULL;
1610 }
1611
1612 /*
1613 * return the mode as indicated by the first
1614 * descriptor in the tx.
1615 */
ahg_mode(struct sdma_txreq * tx)1616 static inline u8 ahg_mode(struct sdma_txreq *tx)
1617 {
1618 return (tx->descp[0].qw[1] & SDMA_DESC1_HEADER_MODE_SMASK)
1619 >> SDMA_DESC1_HEADER_MODE_SHIFT;
1620 }
1621
1622 /**
1623 * __sdma_txclean() - clean tx of mappings, descp *kmalloc's
1624 * @dd: hfi1_devdata for unmapping
1625 * @tx: tx request to clean
1626 *
1627 * This is used in the progress routine to clean the tx or
1628 * by the ULP to toss an in-process tx build.
1629 *
1630 * The code can be called multiple times without issue.
1631 *
1632 */
__sdma_txclean(struct hfi1_devdata * dd,struct sdma_txreq * tx)1633 void __sdma_txclean(
1634 struct hfi1_devdata *dd,
1635 struct sdma_txreq *tx)
1636 {
1637 u16 i;
1638
1639 if (tx->num_desc) {
1640 u8 skip = 0, mode = ahg_mode(tx);
1641
1642 /* unmap first */
1643 sdma_unmap_desc(dd, &tx->descp[0]);
1644 /* determine number of AHG descriptors to skip */
1645 if (mode > SDMA_AHG_APPLY_UPDATE1)
1646 skip = mode >> 1;
1647 for (i = 1 + skip; i < tx->num_desc; i++)
1648 sdma_unmap_desc(dd, &tx->descp[i]);
1649 tx->num_desc = 0;
1650 }
1651 kfree(tx->coalesce_buf);
1652 tx->coalesce_buf = NULL;
1653 /* kmalloc'ed descp */
1654 if (unlikely(tx->desc_limit > ARRAY_SIZE(tx->descs))) {
1655 tx->desc_limit = ARRAY_SIZE(tx->descs);
1656 kfree(tx->descp);
1657 }
1658 }
1659
sdma_gethead(struct sdma_engine * sde)1660 static inline u16 sdma_gethead(struct sdma_engine *sde)
1661 {
1662 struct hfi1_devdata *dd = sde->dd;
1663 int use_dmahead;
1664 u16 hwhead;
1665
1666 #ifdef CONFIG_SDMA_VERBOSITY
1667 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
1668 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
1669 #endif
1670
1671 retry:
1672 use_dmahead = HFI1_CAP_IS_KSET(USE_SDMA_HEAD) && __sdma_running(sde) &&
1673 (dd->flags & HFI1_HAS_SDMA_TIMEOUT);
1674 hwhead = use_dmahead ?
1675 (u16)le64_to_cpu(*sde->head_dma) :
1676 (u16)read_sde_csr(sde, SD(HEAD));
1677
1678 if (unlikely(HFI1_CAP_IS_KSET(SDMA_HEAD_CHECK))) {
1679 u16 cnt;
1680 u16 swtail;
1681 u16 swhead;
1682 int sane;
1683
1684 swhead = sde->descq_head & sde->sdma_mask;
1685 /* this code is really bad for cache line trading */
1686 swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
1687 cnt = sde->descq_cnt;
1688
1689 if (swhead < swtail)
1690 /* not wrapped */
1691 sane = (hwhead >= swhead) & (hwhead <= swtail);
1692 else if (swhead > swtail)
1693 /* wrapped around */
1694 sane = ((hwhead >= swhead) && (hwhead < cnt)) ||
1695 (hwhead <= swtail);
1696 else
1697 /* empty */
1698 sane = (hwhead == swhead);
1699
1700 if (unlikely(!sane)) {
1701 dd_dev_err(dd, "SDMA(%u) bad head (%s) hwhd=%u swhd=%u swtl=%u cnt=%u\n",
1702 sde->this_idx,
1703 use_dmahead ? "dma" : "kreg",
1704 hwhead, swhead, swtail, cnt);
1705 if (use_dmahead) {
1706 /* try one more time, using csr */
1707 use_dmahead = 0;
1708 goto retry;
1709 }
1710 /* proceed as if no progress */
1711 hwhead = swhead;
1712 }
1713 }
1714 return hwhead;
1715 }
1716
1717 /*
1718 * This is called when there are send DMA descriptors that might be
1719 * available.
1720 *
1721 * This is called with head_lock held.
1722 */
sdma_desc_avail(struct sdma_engine * sde,uint avail)1723 static void sdma_desc_avail(struct sdma_engine *sde, uint avail)
1724 {
1725 struct iowait *wait, *nw, *twait;
1726 struct iowait *waits[SDMA_WAIT_BATCH_SIZE];
1727 uint i, n = 0, seq, tidx = 0;
1728
1729 #ifdef CONFIG_SDMA_VERBOSITY
1730 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n", sde->this_idx,
1731 slashstrip(__FILE__), __LINE__, __func__);
1732 dd_dev_err(sde->dd, "avail: %u\n", avail);
1733 #endif
1734
1735 do {
1736 seq = read_seqbegin(&sde->waitlock);
1737 if (!list_empty(&sde->dmawait)) {
1738 /* at least one item */
1739 write_seqlock(&sde->waitlock);
1740 /* Harvest waiters wanting DMA descriptors */
1741 list_for_each_entry_safe(
1742 wait,
1743 nw,
1744 &sde->dmawait,
1745 list) {
1746 u32 num_desc;
1747
1748 if (!wait->wakeup)
1749 continue;
1750 if (n == ARRAY_SIZE(waits))
1751 break;
1752 iowait_init_priority(wait);
1753 num_desc = iowait_get_all_desc(wait);
1754 if (num_desc > avail)
1755 break;
1756 avail -= num_desc;
1757 /* Find the top-priority wait memeber */
1758 if (n) {
1759 twait = waits[tidx];
1760 tidx =
1761 iowait_priority_update_top(wait,
1762 twait,
1763 n,
1764 tidx);
1765 }
1766 list_del_init(&wait->list);
1767 waits[n++] = wait;
1768 }
1769 write_sequnlock(&sde->waitlock);
1770 break;
1771 }
1772 } while (read_seqretry(&sde->waitlock, seq));
1773
1774 /* Schedule the top-priority entry first */
1775 if (n)
1776 waits[tidx]->wakeup(waits[tidx], SDMA_AVAIL_REASON);
1777
1778 for (i = 0; i < n; i++)
1779 if (i != tidx)
1780 waits[i]->wakeup(waits[i], SDMA_AVAIL_REASON);
1781 }
1782
1783 /* head_lock must be held */
sdma_make_progress(struct sdma_engine * sde,u64 status)1784 static void sdma_make_progress(struct sdma_engine *sde, u64 status)
1785 {
1786 struct sdma_txreq *txp = NULL;
1787 int progress = 0;
1788 u16 hwhead, swhead;
1789 int idle_check_done = 0;
1790
1791 hwhead = sdma_gethead(sde);
1792
1793 /* The reason for some of the complexity of this code is that
1794 * not all descriptors have corresponding txps. So, we have to
1795 * be able to skip over descs until we wander into the range of
1796 * the next txp on the list.
1797 */
1798
1799 retry:
1800 txp = get_txhead(sde);
1801 swhead = sde->descq_head & sde->sdma_mask;
1802 trace_hfi1_sdma_progress(sde, hwhead, swhead, txp);
1803 while (swhead != hwhead) {
1804 /* advance head, wrap if needed */
1805 swhead = ++sde->descq_head & sde->sdma_mask;
1806
1807 /* if now past this txp's descs, do the callback */
1808 if (txp && txp->next_descq_idx == swhead) {
1809 /* remove from list */
1810 sde->tx_ring[sde->tx_head++ & sde->sdma_mask] = NULL;
1811 complete_tx(sde, txp, SDMA_TXREQ_S_OK);
1812 /* see if there is another txp */
1813 txp = get_txhead(sde);
1814 }
1815 trace_hfi1_sdma_progress(sde, hwhead, swhead, txp);
1816 progress++;
1817 }
1818
1819 /*
1820 * The SDMA idle interrupt is not guaranteed to be ordered with respect
1821 * to updates to the dma_head location in host memory. The head
1822 * value read might not be fully up to date. If there are pending
1823 * descriptors and the SDMA idle interrupt fired then read from the
1824 * CSR SDMA head instead to get the latest value from the hardware.
1825 * The hardware SDMA head should be read at most once in this invocation
1826 * of sdma_make_progress(..) which is ensured by idle_check_done flag
1827 */
1828 if ((status & sde->idle_mask) && !idle_check_done) {
1829 u16 swtail;
1830
1831 swtail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
1832 if (swtail != hwhead) {
1833 hwhead = (u16)read_sde_csr(sde, SD(HEAD));
1834 idle_check_done = 1;
1835 goto retry;
1836 }
1837 }
1838
1839 sde->last_status = status;
1840 if (progress)
1841 sdma_desc_avail(sde, sdma_descq_freecnt(sde));
1842 }
1843
1844 /*
1845 * sdma_engine_interrupt() - interrupt handler for engine
1846 * @sde: sdma engine
1847 * @status: sdma interrupt reason
1848 *
1849 * Status is a mask of the 3 possible interrupts for this engine. It will
1850 * contain bits _only_ for this SDMA engine. It will contain at least one
1851 * bit, it may contain more.
1852 */
sdma_engine_interrupt(struct sdma_engine * sde,u64 status)1853 void sdma_engine_interrupt(struct sdma_engine *sde, u64 status)
1854 {
1855 trace_hfi1_sdma_engine_interrupt(sde, status);
1856 write_seqlock(&sde->head_lock);
1857 sdma_set_desc_cnt(sde, sdma_desct_intr);
1858 if (status & sde->idle_mask)
1859 sde->idle_int_cnt++;
1860 else if (status & sde->progress_mask)
1861 sde->progress_int_cnt++;
1862 else if (status & sde->int_mask)
1863 sde->sdma_int_cnt++;
1864 sdma_make_progress(sde, status);
1865 write_sequnlock(&sde->head_lock);
1866 }
1867
1868 /**
1869 * sdma_engine_error() - error handler for engine
1870 * @sde: sdma engine
1871 * @status: sdma interrupt reason
1872 */
sdma_engine_error(struct sdma_engine * sde,u64 status)1873 void sdma_engine_error(struct sdma_engine *sde, u64 status)
1874 {
1875 unsigned long flags;
1876
1877 #ifdef CONFIG_SDMA_VERBOSITY
1878 dd_dev_err(sde->dd, "CONFIG SDMA(%u) error status 0x%llx state %s\n",
1879 sde->this_idx,
1880 (unsigned long long)status,
1881 sdma_state_names[sde->state.current_state]);
1882 #endif
1883 spin_lock_irqsave(&sde->tail_lock, flags);
1884 write_seqlock(&sde->head_lock);
1885 if (status & ALL_SDMA_ENG_HALT_ERRS)
1886 __sdma_process_event(sde, sdma_event_e60_hw_halted);
1887 if (status & ~SD(ENG_ERR_STATUS_SDMA_HALT_ERR_SMASK)) {
1888 dd_dev_err(sde->dd,
1889 "SDMA (%u) engine error: 0x%llx state %s\n",
1890 sde->this_idx,
1891 (unsigned long long)status,
1892 sdma_state_names[sde->state.current_state]);
1893 dump_sdma_state(sde);
1894 }
1895 write_sequnlock(&sde->head_lock);
1896 spin_unlock_irqrestore(&sde->tail_lock, flags);
1897 }
1898
sdma_sendctrl(struct sdma_engine * sde,unsigned op)1899 static void sdma_sendctrl(struct sdma_engine *sde, unsigned op)
1900 {
1901 u64 set_senddmactrl = 0;
1902 u64 clr_senddmactrl = 0;
1903 unsigned long flags;
1904
1905 #ifdef CONFIG_SDMA_VERBOSITY
1906 dd_dev_err(sde->dd, "CONFIG SDMA(%u) senddmactrl E=%d I=%d H=%d C=%d\n",
1907 sde->this_idx,
1908 (op & SDMA_SENDCTRL_OP_ENABLE) ? 1 : 0,
1909 (op & SDMA_SENDCTRL_OP_INTENABLE) ? 1 : 0,
1910 (op & SDMA_SENDCTRL_OP_HALT) ? 1 : 0,
1911 (op & SDMA_SENDCTRL_OP_CLEANUP) ? 1 : 0);
1912 #endif
1913
1914 if (op & SDMA_SENDCTRL_OP_ENABLE)
1915 set_senddmactrl |= SD(CTRL_SDMA_ENABLE_SMASK);
1916 else
1917 clr_senddmactrl |= SD(CTRL_SDMA_ENABLE_SMASK);
1918
1919 if (op & SDMA_SENDCTRL_OP_INTENABLE)
1920 set_senddmactrl |= SD(CTRL_SDMA_INT_ENABLE_SMASK);
1921 else
1922 clr_senddmactrl |= SD(CTRL_SDMA_INT_ENABLE_SMASK);
1923
1924 if (op & SDMA_SENDCTRL_OP_HALT)
1925 set_senddmactrl |= SD(CTRL_SDMA_HALT_SMASK);
1926 else
1927 clr_senddmactrl |= SD(CTRL_SDMA_HALT_SMASK);
1928
1929 spin_lock_irqsave(&sde->senddmactrl_lock, flags);
1930
1931 sde->p_senddmactrl |= set_senddmactrl;
1932 sde->p_senddmactrl &= ~clr_senddmactrl;
1933
1934 if (op & SDMA_SENDCTRL_OP_CLEANUP)
1935 write_sde_csr(sde, SD(CTRL),
1936 sde->p_senddmactrl |
1937 SD(CTRL_SDMA_CLEANUP_SMASK));
1938 else
1939 write_sde_csr(sde, SD(CTRL), sde->p_senddmactrl);
1940
1941 spin_unlock_irqrestore(&sde->senddmactrl_lock, flags);
1942
1943 #ifdef CONFIG_SDMA_VERBOSITY
1944 sdma_dumpstate(sde);
1945 #endif
1946 }
1947
sdma_setlengen(struct sdma_engine * sde)1948 static void sdma_setlengen(struct sdma_engine *sde)
1949 {
1950 #ifdef CONFIG_SDMA_VERBOSITY
1951 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
1952 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
1953 #endif
1954
1955 /*
1956 * Set SendDmaLenGen and clear-then-set the MSB of the generation
1957 * count to enable generation checking and load the internal
1958 * generation counter.
1959 */
1960 write_sde_csr(sde, SD(LEN_GEN),
1961 (sde->descq_cnt / 64) << SD(LEN_GEN_LENGTH_SHIFT));
1962 write_sde_csr(sde, SD(LEN_GEN),
1963 ((sde->descq_cnt / 64) << SD(LEN_GEN_LENGTH_SHIFT)) |
1964 (4ULL << SD(LEN_GEN_GENERATION_SHIFT)));
1965 }
1966
sdma_update_tail(struct sdma_engine * sde,u16 tail)1967 static inline void sdma_update_tail(struct sdma_engine *sde, u16 tail)
1968 {
1969 /* Commit writes to memory and advance the tail on the chip */
1970 smp_wmb(); /* see get_txhead() */
1971 writeq(tail, sde->tail_csr);
1972 }
1973
1974 /*
1975 * This is called when changing to state s10_hw_start_up_halt_wait as
1976 * a result of send buffer errors or send DMA descriptor errors.
1977 */
sdma_hw_start_up(struct sdma_engine * sde)1978 static void sdma_hw_start_up(struct sdma_engine *sde)
1979 {
1980 u64 reg;
1981
1982 #ifdef CONFIG_SDMA_VERBOSITY
1983 dd_dev_err(sde->dd, "CONFIG SDMA(%u) %s:%d %s()\n",
1984 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
1985 #endif
1986
1987 sdma_setlengen(sde);
1988 sdma_update_tail(sde, 0); /* Set SendDmaTail */
1989 *sde->head_dma = 0;
1990
1991 reg = SD(ENG_ERR_CLEAR_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_MASK) <<
1992 SD(ENG_ERR_CLEAR_SDMA_HEADER_REQUEST_FIFO_UNC_ERR_SHIFT);
1993 write_sde_csr(sde, SD(ENG_ERR_CLEAR), reg);
1994 }
1995
1996 /*
1997 * set_sdma_integrity
1998 *
1999 * Set the SEND_DMA_CHECK_ENABLE register for send DMA engine 'sde'.
2000 */
set_sdma_integrity(struct sdma_engine * sde)2001 static void set_sdma_integrity(struct sdma_engine *sde)
2002 {
2003 struct hfi1_devdata *dd = sde->dd;
2004
2005 write_sde_csr(sde, SD(CHECK_ENABLE),
2006 hfi1_pkt_base_sdma_integrity(dd));
2007 }
2008
init_sdma_regs(struct sdma_engine * sde,u32 credits,uint idle_cnt)2009 static void init_sdma_regs(
2010 struct sdma_engine *sde,
2011 u32 credits,
2012 uint idle_cnt)
2013 {
2014 u8 opval, opmask;
2015 #ifdef CONFIG_SDMA_VERBOSITY
2016 struct hfi1_devdata *dd = sde->dd;
2017
2018 dd_dev_err(dd, "CONFIG SDMA(%u) %s:%d %s()\n",
2019 sde->this_idx, slashstrip(__FILE__), __LINE__, __func__);
2020 #endif
2021
2022 write_sde_csr(sde, SD(BASE_ADDR), sde->descq_phys);
2023 sdma_setlengen(sde);
2024 sdma_update_tail(sde, 0); /* Set SendDmaTail */
2025 write_sde_csr(sde, SD(RELOAD_CNT), idle_cnt);
2026 write_sde_csr(sde, SD(DESC_CNT), 0);
2027 write_sde_csr(sde, SD(HEAD_ADDR), sde->head_phys);
2028 write_sde_csr(sde, SD(MEMORY),
2029 ((u64)credits << SD(MEMORY_SDMA_MEMORY_CNT_SHIFT)) |
2030 ((u64)(credits * sde->this_idx) <<
2031 SD(MEMORY_SDMA_MEMORY_INDEX_SHIFT)));
2032 write_sde_csr(sde, SD(ENG_ERR_MASK), ~0ull);
2033 set_sdma_integrity(sde);
2034 opmask = OPCODE_CHECK_MASK_DISABLED;
2035 opval = OPCODE_CHECK_VAL_DISABLED;
2036 write_sde_csr(sde, SD(CHECK_OPCODE),
2037 (opmask << SEND_CTXT_CHECK_OPCODE_MASK_SHIFT) |
2038 (opval << SEND_CTXT_CHECK_OPCODE_VALUE_SHIFT));
2039 }
2040
2041 #ifdef CONFIG_SDMA_VERBOSITY
2042
2043 #define sdma_dumpstate_helper0(reg) do { \
2044 csr = read_csr(sde->dd, reg); \
2045 dd_dev_err(sde->dd, "%36s 0x%016llx\n", #reg, csr); \
2046 } while (0)
2047
2048 #define sdma_dumpstate_helper(reg) do { \
2049 csr = read_sde_csr(sde, reg); \
2050 dd_dev_err(sde->dd, "%36s[%02u] 0x%016llx\n", \
2051 #reg, sde->this_idx, csr); \
2052 } while (0)
2053
2054 #define sdma_dumpstate_helper2(reg) do { \
2055 csr = read_csr(sde->dd, reg + (8 * i)); \
2056 dd_dev_err(sde->dd, "%33s_%02u 0x%016llx\n", \
2057 #reg, i, csr); \
2058 } while (0)
2059
sdma_dumpstate(struct sdma_engine * sde)2060 void sdma_dumpstate(struct sdma_engine *sde)
2061 {
2062 u64 csr;
2063 unsigned i;
2064
2065 sdma_dumpstate_helper(SD(CTRL));
2066 sdma_dumpstate_helper(SD(STATUS));
2067 sdma_dumpstate_helper0(SD(ERR_STATUS));
2068 sdma_dumpstate_helper0(SD(ERR_MASK));
2069 sdma_dumpstate_helper(SD(ENG_ERR_STATUS));
2070 sdma_dumpstate_helper(SD(ENG_ERR_MASK));
2071
2072 for (i = 0; i < CCE_NUM_INT_CSRS; ++i) {
2073 sdma_dumpstate_helper2(CCE_INT_STATUS);
2074 sdma_dumpstate_helper2(CCE_INT_MASK);
2075 sdma_dumpstate_helper2(CCE_INT_BLOCKED);
2076 }
2077
2078 sdma_dumpstate_helper(SD(TAIL));
2079 sdma_dumpstate_helper(SD(HEAD));
2080 sdma_dumpstate_helper(SD(PRIORITY_THLD));
2081 sdma_dumpstate_helper(SD(IDLE_CNT));
2082 sdma_dumpstate_helper(SD(RELOAD_CNT));
2083 sdma_dumpstate_helper(SD(DESC_CNT));
2084 sdma_dumpstate_helper(SD(DESC_FETCHED_CNT));
2085 sdma_dumpstate_helper(SD(MEMORY));
2086 sdma_dumpstate_helper0(SD(ENGINES));
2087 sdma_dumpstate_helper0(SD(MEM_SIZE));
2088 /* sdma_dumpstate_helper(SEND_EGRESS_SEND_DMA_STATUS); */
2089 sdma_dumpstate_helper(SD(BASE_ADDR));
2090 sdma_dumpstate_helper(SD(LEN_GEN));
2091 sdma_dumpstate_helper(SD(HEAD_ADDR));
2092 sdma_dumpstate_helper(SD(CHECK_ENABLE));
2093 sdma_dumpstate_helper(SD(CHECK_VL));
2094 sdma_dumpstate_helper(SD(CHECK_JOB_KEY));
2095 sdma_dumpstate_helper(SD(CHECK_PARTITION_KEY));
2096 sdma_dumpstate_helper(SD(CHECK_SLID));
2097 sdma_dumpstate_helper(SD(CHECK_OPCODE));
2098 }
2099 #endif
2100
dump_sdma_state(struct sdma_engine * sde)2101 static void dump_sdma_state(struct sdma_engine *sde)
2102 {
2103 struct hw_sdma_desc *descqp;
2104 u64 desc[2];
2105 u64 addr;
2106 u8 gen;
2107 u16 len;
2108 u16 head, tail, cnt;
2109
2110 head = sde->descq_head & sde->sdma_mask;
2111 tail = sde->descq_tail & sde->sdma_mask;
2112 cnt = sdma_descq_freecnt(sde);
2113
2114 dd_dev_err(sde->dd,
2115 "SDMA (%u) descq_head: %u descq_tail: %u freecnt: %u FLE %d\n",
2116 sde->this_idx, head, tail, cnt,
2117 !list_empty(&sde->flushlist));
2118
2119 /* print info for each entry in the descriptor queue */
2120 while (head != tail) {
2121 char flags[6] = { 'x', 'x', 'x', 'x', 0 };
2122
2123 descqp = &sde->descq[head];
2124 desc[0] = le64_to_cpu(descqp->qw[0]);
2125 desc[1] = le64_to_cpu(descqp->qw[1]);
2126 flags[0] = (desc[1] & SDMA_DESC1_INT_REQ_FLAG) ? 'I' : '-';
2127 flags[1] = (desc[1] & SDMA_DESC1_HEAD_TO_HOST_FLAG) ?
2128 'H' : '-';
2129 flags[2] = (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) ? 'F' : '-';
2130 flags[3] = (desc[0] & SDMA_DESC0_LAST_DESC_FLAG) ? 'L' : '-';
2131 addr = (desc[0] >> SDMA_DESC0_PHY_ADDR_SHIFT)
2132 & SDMA_DESC0_PHY_ADDR_MASK;
2133 gen = (desc[1] >> SDMA_DESC1_GENERATION_SHIFT)
2134 & SDMA_DESC1_GENERATION_MASK;
2135 len = (desc[0] >> SDMA_DESC0_BYTE_COUNT_SHIFT)
2136 & SDMA_DESC0_BYTE_COUNT_MASK;
2137 dd_dev_err(sde->dd,
2138 "SDMA sdmadesc[%u]: flags:%s addr:0x%016llx gen:%u len:%u bytes\n",
2139 head, flags, addr, gen, len);
2140 dd_dev_err(sde->dd,
2141 "\tdesc0:0x%016llx desc1 0x%016llx\n",
2142 desc[0], desc[1]);
2143 if (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG)
2144 dd_dev_err(sde->dd,
2145 "\taidx: %u amode: %u alen: %u\n",
2146 (u8)((desc[1] &
2147 SDMA_DESC1_HEADER_INDEX_SMASK) >>
2148 SDMA_DESC1_HEADER_INDEX_SHIFT),
2149 (u8)((desc[1] &
2150 SDMA_DESC1_HEADER_MODE_SMASK) >>
2151 SDMA_DESC1_HEADER_MODE_SHIFT),
2152 (u8)((desc[1] &
2153 SDMA_DESC1_HEADER_DWS_SMASK) >>
2154 SDMA_DESC1_HEADER_DWS_SHIFT));
2155 head++;
2156 head &= sde->sdma_mask;
2157 }
2158 }
2159
2160 #define SDE_FMT \
2161 "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"
2162 /**
2163 * sdma_seqfile_dump_sde() - debugfs dump of sde
2164 * @s: seq file
2165 * @sde: send dma engine to dump
2166 *
2167 * This routine dumps the sde to the indicated seq file.
2168 */
sdma_seqfile_dump_sde(struct seq_file * s,struct sdma_engine * sde)2169 void sdma_seqfile_dump_sde(struct seq_file *s, struct sdma_engine *sde)
2170 {
2171 u16 head, tail;
2172 struct hw_sdma_desc *descqp;
2173 u64 desc[2];
2174 u64 addr;
2175 u8 gen;
2176 u16 len;
2177
2178 head = sde->descq_head & sde->sdma_mask;
2179 tail = READ_ONCE(sde->descq_tail) & sde->sdma_mask;
2180 seq_printf(s, SDE_FMT, sde->this_idx,
2181 sde->cpu,
2182 sdma_state_name(sde->state.current_state),
2183 (unsigned long long)read_sde_csr(sde, SD(CTRL)),
2184 (unsigned long long)read_sde_csr(sde, SD(STATUS)),
2185 (unsigned long long)read_sde_csr(sde, SD(ENG_ERR_STATUS)),
2186 (unsigned long long)read_sde_csr(sde, SD(TAIL)), tail,
2187 (unsigned long long)read_sde_csr(sde, SD(HEAD)), head,
2188 (unsigned long long)le64_to_cpu(*sde->head_dma),
2189 (unsigned long long)read_sde_csr(sde, SD(MEMORY)),
2190 (unsigned long long)read_sde_csr(sde, SD(LEN_GEN)),
2191 (unsigned long long)read_sde_csr(sde, SD(RELOAD_CNT)),
2192 (unsigned long long)sde->last_status,
2193 (unsigned long long)sde->ahg_bits,
2194 sde->tx_tail,
2195 sde->tx_head,
2196 sde->descq_tail,
2197 sde->descq_head,
2198 !list_empty(&sde->flushlist),
2199 sde->descq_full_count,
2200 (unsigned long long)read_sde_csr(sde, SEND_DMA_CHECK_SLID));
2201
2202 /* print info for each entry in the descriptor queue */
2203 while (head != tail) {
2204 char flags[6] = { 'x', 'x', 'x', 'x', 0 };
2205
2206 descqp = &sde->descq[head];
2207 desc[0] = le64_to_cpu(descqp->qw[0]);
2208 desc[1] = le64_to_cpu(descqp->qw[1]);
2209 flags[0] = (desc[1] & SDMA_DESC1_INT_REQ_FLAG) ? 'I' : '-';
2210 flags[1] = (desc[1] & SDMA_DESC1_HEAD_TO_HOST_FLAG) ?
2211 'H' : '-';
2212 flags[2] = (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG) ? 'F' : '-';
2213 flags[3] = (desc[0] & SDMA_DESC0_LAST_DESC_FLAG) ? 'L' : '-';
2214 addr = (desc[0] >> SDMA_DESC0_PHY_ADDR_SHIFT)
2215 & SDMA_DESC0_PHY_ADDR_MASK;
2216 gen = (desc[1] >> SDMA_DESC1_GENERATION_SHIFT)
2217 & SDMA_DESC1_GENERATION_MASK;
2218 len = (desc[0] >> SDMA_DESC0_BYTE_COUNT_SHIFT)
2219 & SDMA_DESC0_BYTE_COUNT_MASK;
2220 seq_printf(s,
2221 "\tdesc[%u]: flags:%s addr:0x%016llx gen:%u len:%u bytes\n",
2222 head, flags, addr, gen, len);
2223 if (desc[0] & SDMA_DESC0_FIRST_DESC_FLAG)
2224 seq_printf(s, "\t\tahgidx: %u ahgmode: %u\n",
2225 (u8)((desc[1] &
2226 SDMA_DESC1_HEADER_INDEX_SMASK) >>
2227 SDMA_DESC1_HEADER_INDEX_SHIFT),
2228 (u8)((desc[1] &
2229 SDMA_DESC1_HEADER_MODE_SMASK) >>
2230 SDMA_DESC1_HEADER_MODE_SHIFT));
2231 head = (head + 1) & sde->sdma_mask;
2232 }
2233 }
2234
2235 /*
2236 * add the generation number into
2237 * the qw1 and return
2238 */
add_gen(struct sdma_engine * sde,u64 qw1)2239 static inline u64 add_gen(struct sdma_engine *sde, u64 qw1)
2240 {
2241 u8 generation = (sde->descq_tail >> sde->sdma_shift) & 3;
2242
2243 qw1 &= ~SDMA_DESC1_GENERATION_SMASK;
2244 qw1 |= ((u64)generation & SDMA_DESC1_GENERATION_MASK)
2245 << SDMA_DESC1_GENERATION_SHIFT;
2246 return qw1;
2247 }
2248
2249 /*
2250 * This routine submits the indicated tx
2251 *
2252 * Space has already been guaranteed and
2253 * tail side of ring is locked.
2254 *
2255 * The hardware tail update is done
2256 * in the caller and that is facilitated
2257 * by returning the new tail.
2258 *
2259 * There is special case logic for ahg
2260 * to not add the generation number for
2261 * up to 2 descriptors that follow the
2262 * first descriptor.
2263 *
2264 */
submit_tx(struct sdma_engine * sde,struct sdma_txreq * tx)2265 static inline u16 submit_tx(struct sdma_engine *sde, struct sdma_txreq *tx)
2266 {
2267 int i;
2268 u16 tail;
2269 struct sdma_desc *descp = tx->descp;
2270 u8 skip = 0, mode = ahg_mode(tx);
2271
2272 tail = sde->descq_tail & sde->sdma_mask;
2273 sde->descq[tail].qw[0] = cpu_to_le64(descp->qw[0]);
2274 sde->descq[tail].qw[1] = cpu_to_le64(add_gen(sde, descp->qw[1]));
2275 trace_hfi1_sdma_descriptor(sde, descp->qw[0], descp->qw[1],
2276 tail, &sde->descq[tail]);
2277 tail = ++sde->descq_tail & sde->sdma_mask;
2278 descp++;
2279 if (mode > SDMA_AHG_APPLY_UPDATE1)
2280 skip = mode >> 1;
2281 for (i = 1; i < tx->num_desc; i++, descp++) {
2282 u64 qw1;
2283
2284 sde->descq[tail].qw[0] = cpu_to_le64(descp->qw[0]);
2285 if (skip) {
2286 /* edits don't have generation */
2287 qw1 = descp->qw[1];
2288 skip--;
2289 } else {
2290 /* replace generation with real one for non-edits */
2291 qw1 = add_gen(sde, descp->qw[1]);
2292 }
2293 sde->descq[tail].qw[1] = cpu_to_le64(qw1);
2294 trace_hfi1_sdma_descriptor(sde, descp->qw[0], qw1,
2295 tail, &sde->descq[tail]);
2296 tail = ++sde->descq_tail & sde->sdma_mask;
2297 }
2298 tx->next_descq_idx = tail;
2299 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
2300 tx->sn = sde->tail_sn++;
2301 trace_hfi1_sdma_in_sn(sde, tx->sn);
2302 WARN_ON_ONCE(sde->tx_ring[sde->tx_tail & sde->sdma_mask]);
2303 #endif
2304 sde->tx_ring[sde->tx_tail++ & sde->sdma_mask] = tx;
2305 sde->desc_avail -= tx->num_desc;
2306 return tail;
2307 }
2308
2309 /*
2310 * Check for progress
2311 */
sdma_check_progress(struct sdma_engine * sde,struct iowait_work * wait,struct sdma_txreq * tx,bool pkts_sent)2312 static int sdma_check_progress(
2313 struct sdma_engine *sde,
2314 struct iowait_work *wait,
2315 struct sdma_txreq *tx,
2316 bool pkts_sent)
2317 {
2318 int ret;
2319
2320 sde->desc_avail = sdma_descq_freecnt(sde);
2321 if (tx->num_desc <= sde->desc_avail)
2322 return -EAGAIN;
2323 /* pulse the head_lock */
2324 if (wait && iowait_ioww_to_iow(wait)->sleep) {
2325 unsigned seq;
2326
2327 seq = raw_seqcount_begin(
2328 (const seqcount_t *)&sde->head_lock.seqcount);
2329 ret = wait->iow->sleep(sde, wait, tx, seq, pkts_sent);
2330 if (ret == -EAGAIN)
2331 sde->desc_avail = sdma_descq_freecnt(sde);
2332 } else {
2333 ret = -EBUSY;
2334 }
2335 return ret;
2336 }
2337
2338 /**
2339 * sdma_send_txreq() - submit a tx req to ring
2340 * @sde: sdma engine to use
2341 * @wait: SE wait structure to use when full (may be NULL)
2342 * @tx: sdma_txreq to submit
2343 * @pkts_sent: has any packet been sent yet?
2344 *
2345 * The call submits the tx into the ring. If a iowait structure is non-NULL
2346 * the packet will be queued to the list in wait.
2347 *
2348 * Return:
2349 * 0 - Success, -EINVAL - sdma_txreq incomplete, -EBUSY - no space in
2350 * ring (wait == NULL)
2351 * -EIOCBQUEUED - tx queued to iowait, -ECOMM bad sdma state
2352 */
sdma_send_txreq(struct sdma_engine * sde,struct iowait_work * wait,struct sdma_txreq * tx,bool pkts_sent)2353 int sdma_send_txreq(struct sdma_engine *sde,
2354 struct iowait_work *wait,
2355 struct sdma_txreq *tx,
2356 bool pkts_sent)
2357 {
2358 int ret = 0;
2359 u16 tail;
2360 unsigned long flags;
2361
2362 /* user should have supplied entire packet */
2363 if (unlikely(tx->tlen))
2364 return -EINVAL;
2365 tx->wait = iowait_ioww_to_iow(wait);
2366 spin_lock_irqsave(&sde->tail_lock, flags);
2367 retry:
2368 if (unlikely(!__sdma_running(sde)))
2369 goto unlock_noconn;
2370 if (unlikely(tx->num_desc > sde->desc_avail))
2371 goto nodesc;
2372 tail = submit_tx(sde, tx);
2373 if (wait)
2374 iowait_sdma_inc(iowait_ioww_to_iow(wait));
2375 sdma_update_tail(sde, tail);
2376 unlock:
2377 spin_unlock_irqrestore(&sde->tail_lock, flags);
2378 return ret;
2379 unlock_noconn:
2380 if (wait)
2381 iowait_sdma_inc(iowait_ioww_to_iow(wait));
2382 tx->next_descq_idx = 0;
2383 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
2384 tx->sn = sde->tail_sn++;
2385 trace_hfi1_sdma_in_sn(sde, tx->sn);
2386 #endif
2387 spin_lock(&sde->flushlist_lock);
2388 list_add_tail(&tx->list, &sde->flushlist);
2389 spin_unlock(&sde->flushlist_lock);
2390 iowait_inc_wait_count(wait, tx->num_desc);
2391 queue_work_on(sde->cpu, system_highpri_wq, &sde->flush_worker);
2392 ret = -ECOMM;
2393 goto unlock;
2394 nodesc:
2395 ret = sdma_check_progress(sde, wait, tx, pkts_sent);
2396 if (ret == -EAGAIN) {
2397 ret = 0;
2398 goto retry;
2399 }
2400 sde->descq_full_count++;
2401 goto unlock;
2402 }
2403
2404 /**
2405 * sdma_send_txlist() - submit a list of tx req to ring
2406 * @sde: sdma engine to use
2407 * @wait: SE wait structure to use when full (may be NULL)
2408 * @tx_list: list of sdma_txreqs to submit
2409 * @count_out: pointer to a u16 which, after return will contain the total number of
2410 * sdma_txreqs removed from the tx_list. This will include sdma_txreqs
2411 * whose SDMA descriptors are submitted to the ring and the sdma_txreqs
2412 * which are added to SDMA engine flush list if the SDMA engine state is
2413 * not running.
2414 *
2415 * The call submits the list into the ring.
2416 *
2417 * If the iowait structure is non-NULL and not equal to the iowait list
2418 * the unprocessed part of the list will be appended to the list in wait.
2419 *
2420 * In all cases, the tx_list will be updated so the head of the tx_list is
2421 * the list of descriptors that have yet to be transmitted.
2422 *
2423 * The intent of this call is to provide a more efficient
2424 * way of submitting multiple packets to SDMA while holding the tail
2425 * side locking.
2426 *
2427 * Return:
2428 * 0 - Success,
2429 * -EINVAL - sdma_txreq incomplete, -EBUSY - no space in ring (wait == NULL)
2430 * -EIOCBQUEUED - tx queued to iowait, -ECOMM bad sdma state
2431 */
sdma_send_txlist(struct sdma_engine * sde,struct iowait_work * wait,struct list_head * tx_list,u16 * count_out)2432 int sdma_send_txlist(struct sdma_engine *sde, struct iowait_work *wait,
2433 struct list_head *tx_list, u16 *count_out)
2434 {
2435 struct sdma_txreq *tx, *tx_next;
2436 int ret = 0;
2437 unsigned long flags;
2438 u16 tail = INVALID_TAIL;
2439 u32 submit_count = 0, flush_count = 0, total_count;
2440
2441 spin_lock_irqsave(&sde->tail_lock, flags);
2442 retry:
2443 list_for_each_entry_safe(tx, tx_next, tx_list, list) {
2444 tx->wait = iowait_ioww_to_iow(wait);
2445 if (unlikely(!__sdma_running(sde)))
2446 goto unlock_noconn;
2447 if (unlikely(tx->num_desc > sde->desc_avail))
2448 goto nodesc;
2449 if (unlikely(tx->tlen)) {
2450 ret = -EINVAL;
2451 goto update_tail;
2452 }
2453 list_del_init(&tx->list);
2454 tail = submit_tx(sde, tx);
2455 submit_count++;
2456 if (tail != INVALID_TAIL &&
2457 (submit_count & SDMA_TAIL_UPDATE_THRESH) == 0) {
2458 sdma_update_tail(sde, tail);
2459 tail = INVALID_TAIL;
2460 }
2461 }
2462 update_tail:
2463 total_count = submit_count + flush_count;
2464 if (wait) {
2465 iowait_sdma_add(iowait_ioww_to_iow(wait), total_count);
2466 iowait_starve_clear(submit_count > 0,
2467 iowait_ioww_to_iow(wait));
2468 }
2469 if (tail != INVALID_TAIL)
2470 sdma_update_tail(sde, tail);
2471 spin_unlock_irqrestore(&sde->tail_lock, flags);
2472 *count_out = total_count;
2473 return ret;
2474 unlock_noconn:
2475 spin_lock(&sde->flushlist_lock);
2476 list_for_each_entry_safe(tx, tx_next, tx_list, list) {
2477 tx->wait = iowait_ioww_to_iow(wait);
2478 list_del_init(&tx->list);
2479 tx->next_descq_idx = 0;
2480 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
2481 tx->sn = sde->tail_sn++;
2482 trace_hfi1_sdma_in_sn(sde, tx->sn);
2483 #endif
2484 list_add_tail(&tx->list, &sde->flushlist);
2485 flush_count++;
2486 iowait_inc_wait_count(wait, tx->num_desc);
2487 }
2488 spin_unlock(&sde->flushlist_lock);
2489 queue_work_on(sde->cpu, system_highpri_wq, &sde->flush_worker);
2490 ret = -ECOMM;
2491 goto update_tail;
2492 nodesc:
2493 ret = sdma_check_progress(sde, wait, tx, submit_count > 0);
2494 if (ret == -EAGAIN) {
2495 ret = 0;
2496 goto retry;
2497 }
2498 sde->descq_full_count++;
2499 goto update_tail;
2500 }
2501
sdma_process_event(struct sdma_engine * sde,enum sdma_events event)2502 static void sdma_process_event(struct sdma_engine *sde, enum sdma_events event)
2503 {
2504 unsigned long flags;
2505
2506 spin_lock_irqsave(&sde->tail_lock, flags);
2507 write_seqlock(&sde->head_lock);
2508
2509 __sdma_process_event(sde, event);
2510
2511 if (sde->state.current_state == sdma_state_s99_running)
2512 sdma_desc_avail(sde, sdma_descq_freecnt(sde));
2513
2514 write_sequnlock(&sde->head_lock);
2515 spin_unlock_irqrestore(&sde->tail_lock, flags);
2516 }
2517
__sdma_process_event(struct sdma_engine * sde,enum sdma_events event)2518 static void __sdma_process_event(struct sdma_engine *sde,
2519 enum sdma_events event)
2520 {
2521 struct sdma_state *ss = &sde->state;
2522 int need_progress = 0;
2523
2524 /* CONFIG SDMA temporary */
2525 #ifdef CONFIG_SDMA_VERBOSITY
2526 dd_dev_err(sde->dd, "CONFIG SDMA(%u) [%s] %s\n", sde->this_idx,
2527 sdma_state_names[ss->current_state],
2528 sdma_event_names[event]);
2529 #endif
2530
2531 switch (ss->current_state) {
2532 case sdma_state_s00_hw_down:
2533 switch (event) {
2534 case sdma_event_e00_go_hw_down:
2535 break;
2536 case sdma_event_e30_go_running:
2537 /*
2538 * If down, but running requested (usually result
2539 * of link up, then we need to start up.
2540 * This can happen when hw down is requested while
2541 * bringing the link up with traffic active on
2542 * 7220, e.g.
2543 */
2544 ss->go_s99_running = 1;
2545 fallthrough; /* and start dma engine */
2546 case sdma_event_e10_go_hw_start:
2547 /* This reference means the state machine is started */
2548 sdma_get(&sde->state);
2549 sdma_set_state(sde,
2550 sdma_state_s10_hw_start_up_halt_wait);
2551 break;
2552 case sdma_event_e15_hw_halt_done:
2553 break;
2554 case sdma_event_e25_hw_clean_up_done:
2555 break;
2556 case sdma_event_e40_sw_cleaned:
2557 sdma_sw_tear_down(sde);
2558 break;
2559 case sdma_event_e50_hw_cleaned:
2560 break;
2561 case sdma_event_e60_hw_halted:
2562 break;
2563 case sdma_event_e70_go_idle:
2564 break;
2565 case sdma_event_e80_hw_freeze:
2566 break;
2567 case sdma_event_e81_hw_frozen:
2568 break;
2569 case sdma_event_e82_hw_unfreeze:
2570 break;
2571 case sdma_event_e85_link_down:
2572 break;
2573 case sdma_event_e90_sw_halted:
2574 break;
2575 }
2576 break;
2577
2578 case sdma_state_s10_hw_start_up_halt_wait:
2579 switch (event) {
2580 case sdma_event_e00_go_hw_down:
2581 sdma_set_state(sde, sdma_state_s00_hw_down);
2582 sdma_sw_tear_down(sde);
2583 break;
2584 case sdma_event_e10_go_hw_start:
2585 break;
2586 case sdma_event_e15_hw_halt_done:
2587 sdma_set_state(sde,
2588 sdma_state_s15_hw_start_up_clean_wait);
2589 sdma_start_hw_clean_up(sde);
2590 break;
2591 case sdma_event_e25_hw_clean_up_done:
2592 break;
2593 case sdma_event_e30_go_running:
2594 ss->go_s99_running = 1;
2595 break;
2596 case sdma_event_e40_sw_cleaned:
2597 break;
2598 case sdma_event_e50_hw_cleaned:
2599 break;
2600 case sdma_event_e60_hw_halted:
2601 schedule_work(&sde->err_halt_worker);
2602 break;
2603 case sdma_event_e70_go_idle:
2604 ss->go_s99_running = 0;
2605 break;
2606 case sdma_event_e80_hw_freeze:
2607 break;
2608 case sdma_event_e81_hw_frozen:
2609 break;
2610 case sdma_event_e82_hw_unfreeze:
2611 break;
2612 case sdma_event_e85_link_down:
2613 break;
2614 case sdma_event_e90_sw_halted:
2615 break;
2616 }
2617 break;
2618
2619 case sdma_state_s15_hw_start_up_clean_wait:
2620 switch (event) {
2621 case sdma_event_e00_go_hw_down:
2622 sdma_set_state(sde, sdma_state_s00_hw_down);
2623 sdma_sw_tear_down(sde);
2624 break;
2625 case sdma_event_e10_go_hw_start:
2626 break;
2627 case sdma_event_e15_hw_halt_done:
2628 break;
2629 case sdma_event_e25_hw_clean_up_done:
2630 sdma_hw_start_up(sde);
2631 sdma_set_state(sde, ss->go_s99_running ?
2632 sdma_state_s99_running :
2633 sdma_state_s20_idle);
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 break;
2644 case sdma_event_e70_go_idle:
2645 ss->go_s99_running = 0;
2646 break;
2647 case sdma_event_e80_hw_freeze:
2648 break;
2649 case sdma_event_e81_hw_frozen:
2650 break;
2651 case sdma_event_e82_hw_unfreeze:
2652 break;
2653 case sdma_event_e85_link_down:
2654 break;
2655 case sdma_event_e90_sw_halted:
2656 break;
2657 }
2658 break;
2659
2660 case sdma_state_s20_idle:
2661 switch (event) {
2662 case sdma_event_e00_go_hw_down:
2663 sdma_set_state(sde, sdma_state_s00_hw_down);
2664 sdma_sw_tear_down(sde);
2665 break;
2666 case sdma_event_e10_go_hw_start:
2667 break;
2668 case sdma_event_e15_hw_halt_done:
2669 break;
2670 case sdma_event_e25_hw_clean_up_done:
2671 break;
2672 case sdma_event_e30_go_running:
2673 sdma_set_state(sde, sdma_state_s99_running);
2674 ss->go_s99_running = 1;
2675 break;
2676 case sdma_event_e40_sw_cleaned:
2677 break;
2678 case sdma_event_e50_hw_cleaned:
2679 break;
2680 case sdma_event_e60_hw_halted:
2681 sdma_set_state(sde, sdma_state_s50_hw_halt_wait);
2682 schedule_work(&sde->err_halt_worker);
2683 break;
2684 case sdma_event_e70_go_idle:
2685 break;
2686 case sdma_event_e85_link_down:
2687 case sdma_event_e80_hw_freeze:
2688 sdma_set_state(sde, sdma_state_s80_hw_freeze);
2689 atomic_dec(&sde->dd->sdma_unfreeze_count);
2690 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
2691 break;
2692 case sdma_event_e81_hw_frozen:
2693 break;
2694 case sdma_event_e82_hw_unfreeze:
2695 break;
2696 case sdma_event_e90_sw_halted:
2697 break;
2698 }
2699 break;
2700
2701 case sdma_state_s30_sw_clean_up_wait:
2702 switch (event) {
2703 case sdma_event_e00_go_hw_down:
2704 sdma_set_state(sde, sdma_state_s00_hw_down);
2705 break;
2706 case sdma_event_e10_go_hw_start:
2707 break;
2708 case sdma_event_e15_hw_halt_done:
2709 break;
2710 case sdma_event_e25_hw_clean_up_done:
2711 break;
2712 case sdma_event_e30_go_running:
2713 ss->go_s99_running = 1;
2714 break;
2715 case sdma_event_e40_sw_cleaned:
2716 sdma_set_state(sde, sdma_state_s40_hw_clean_up_wait);
2717 sdma_start_hw_clean_up(sde);
2718 break;
2719 case sdma_event_e50_hw_cleaned:
2720 break;
2721 case sdma_event_e60_hw_halted:
2722 break;
2723 case sdma_event_e70_go_idle:
2724 ss->go_s99_running = 0;
2725 break;
2726 case sdma_event_e80_hw_freeze:
2727 break;
2728 case sdma_event_e81_hw_frozen:
2729 break;
2730 case sdma_event_e82_hw_unfreeze:
2731 break;
2732 case sdma_event_e85_link_down:
2733 ss->go_s99_running = 0;
2734 break;
2735 case sdma_event_e90_sw_halted:
2736 break;
2737 }
2738 break;
2739
2740 case sdma_state_s40_hw_clean_up_wait:
2741 switch (event) {
2742 case sdma_event_e00_go_hw_down:
2743 sdma_set_state(sde, sdma_state_s00_hw_down);
2744 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2745 break;
2746 case sdma_event_e10_go_hw_start:
2747 break;
2748 case sdma_event_e15_hw_halt_done:
2749 break;
2750 case sdma_event_e25_hw_clean_up_done:
2751 sdma_hw_start_up(sde);
2752 sdma_set_state(sde, ss->go_s99_running ?
2753 sdma_state_s99_running :
2754 sdma_state_s20_idle);
2755 break;
2756 case sdma_event_e30_go_running:
2757 ss->go_s99_running = 1;
2758 break;
2759 case sdma_event_e40_sw_cleaned:
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_s50_hw_halt_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 sdma_set_state(sde, sdma_state_s30_sw_clean_up_wait);
2792 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2793 break;
2794 case sdma_event_e25_hw_clean_up_done:
2795 break;
2796 case sdma_event_e30_go_running:
2797 ss->go_s99_running = 1;
2798 break;
2799 case sdma_event_e40_sw_cleaned:
2800 break;
2801 case sdma_event_e50_hw_cleaned:
2802 break;
2803 case sdma_event_e60_hw_halted:
2804 schedule_work(&sde->err_halt_worker);
2805 break;
2806 case sdma_event_e70_go_idle:
2807 ss->go_s99_running = 0;
2808 break;
2809 case sdma_event_e80_hw_freeze:
2810 break;
2811 case sdma_event_e81_hw_frozen:
2812 break;
2813 case sdma_event_e82_hw_unfreeze:
2814 break;
2815 case sdma_event_e85_link_down:
2816 ss->go_s99_running = 0;
2817 break;
2818 case sdma_event_e90_sw_halted:
2819 break;
2820 }
2821 break;
2822
2823 case sdma_state_s60_idle_halt_wait:
2824 switch (event) {
2825 case sdma_event_e00_go_hw_down:
2826 sdma_set_state(sde, sdma_state_s00_hw_down);
2827 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2828 break;
2829 case sdma_event_e10_go_hw_start:
2830 break;
2831 case sdma_event_e15_hw_halt_done:
2832 sdma_set_state(sde, sdma_state_s30_sw_clean_up_wait);
2833 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2834 break;
2835 case sdma_event_e25_hw_clean_up_done:
2836 break;
2837 case sdma_event_e30_go_running:
2838 ss->go_s99_running = 1;
2839 break;
2840 case sdma_event_e40_sw_cleaned:
2841 break;
2842 case sdma_event_e50_hw_cleaned:
2843 break;
2844 case sdma_event_e60_hw_halted:
2845 schedule_work(&sde->err_halt_worker);
2846 break;
2847 case sdma_event_e70_go_idle:
2848 ss->go_s99_running = 0;
2849 break;
2850 case sdma_event_e80_hw_freeze:
2851 break;
2852 case sdma_event_e81_hw_frozen:
2853 break;
2854 case sdma_event_e82_hw_unfreeze:
2855 break;
2856 case sdma_event_e85_link_down:
2857 break;
2858 case sdma_event_e90_sw_halted:
2859 break;
2860 }
2861 break;
2862
2863 case sdma_state_s80_hw_freeze:
2864 switch (event) {
2865 case sdma_event_e00_go_hw_down:
2866 sdma_set_state(sde, sdma_state_s00_hw_down);
2867 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2868 break;
2869 case sdma_event_e10_go_hw_start:
2870 break;
2871 case sdma_event_e15_hw_halt_done:
2872 break;
2873 case sdma_event_e25_hw_clean_up_done:
2874 break;
2875 case sdma_event_e30_go_running:
2876 ss->go_s99_running = 1;
2877 break;
2878 case sdma_event_e40_sw_cleaned:
2879 break;
2880 case sdma_event_e50_hw_cleaned:
2881 break;
2882 case sdma_event_e60_hw_halted:
2883 break;
2884 case sdma_event_e70_go_idle:
2885 ss->go_s99_running = 0;
2886 break;
2887 case sdma_event_e80_hw_freeze:
2888 break;
2889 case sdma_event_e81_hw_frozen:
2890 sdma_set_state(sde, sdma_state_s82_freeze_sw_clean);
2891 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2892 break;
2893 case sdma_event_e82_hw_unfreeze:
2894 break;
2895 case sdma_event_e85_link_down:
2896 break;
2897 case sdma_event_e90_sw_halted:
2898 break;
2899 }
2900 break;
2901
2902 case sdma_state_s82_freeze_sw_clean:
2903 switch (event) {
2904 case sdma_event_e00_go_hw_down:
2905 sdma_set_state(sde, sdma_state_s00_hw_down);
2906 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2907 break;
2908 case sdma_event_e10_go_hw_start:
2909 break;
2910 case sdma_event_e15_hw_halt_done:
2911 break;
2912 case sdma_event_e25_hw_clean_up_done:
2913 break;
2914 case sdma_event_e30_go_running:
2915 ss->go_s99_running = 1;
2916 break;
2917 case sdma_event_e40_sw_cleaned:
2918 /* notify caller this engine is done cleaning */
2919 atomic_dec(&sde->dd->sdma_unfreeze_count);
2920 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
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 break;
2933 case sdma_event_e82_hw_unfreeze:
2934 sdma_hw_start_up(sde);
2935 sdma_set_state(sde, ss->go_s99_running ?
2936 sdma_state_s99_running :
2937 sdma_state_s20_idle);
2938 break;
2939 case sdma_event_e85_link_down:
2940 break;
2941 case sdma_event_e90_sw_halted:
2942 break;
2943 }
2944 break;
2945
2946 case sdma_state_s99_running:
2947 switch (event) {
2948 case sdma_event_e00_go_hw_down:
2949 sdma_set_state(sde, sdma_state_s00_hw_down);
2950 tasklet_hi_schedule(&sde->sdma_sw_clean_up_task);
2951 break;
2952 case sdma_event_e10_go_hw_start:
2953 break;
2954 case sdma_event_e15_hw_halt_done:
2955 break;
2956 case sdma_event_e25_hw_clean_up_done:
2957 break;
2958 case sdma_event_e30_go_running:
2959 break;
2960 case sdma_event_e40_sw_cleaned:
2961 break;
2962 case sdma_event_e50_hw_cleaned:
2963 break;
2964 case sdma_event_e60_hw_halted:
2965 need_progress = 1;
2966 sdma_err_progress_check_schedule(sde);
2967 fallthrough;
2968 case sdma_event_e90_sw_halted:
2969 /*
2970 * SW initiated halt does not perform engines
2971 * progress check
2972 */
2973 sdma_set_state(sde, sdma_state_s50_hw_halt_wait);
2974 schedule_work(&sde->err_halt_worker);
2975 break;
2976 case sdma_event_e70_go_idle:
2977 sdma_set_state(sde, sdma_state_s60_idle_halt_wait);
2978 break;
2979 case sdma_event_e85_link_down:
2980 ss->go_s99_running = 0;
2981 fallthrough;
2982 case sdma_event_e80_hw_freeze:
2983 sdma_set_state(sde, sdma_state_s80_hw_freeze);
2984 atomic_dec(&sde->dd->sdma_unfreeze_count);
2985 wake_up_interruptible(&sde->dd->sdma_unfreeze_wq);
2986 break;
2987 case sdma_event_e81_hw_frozen:
2988 break;
2989 case sdma_event_e82_hw_unfreeze:
2990 break;
2991 }
2992 break;
2993 }
2994
2995 ss->last_event = event;
2996 if (need_progress)
2997 sdma_make_progress(sde, 0);
2998 }
2999
3000 /*
3001 * _extend_sdma_tx_descs() - helper to extend txreq
3002 *
3003 * This is called once the initial nominal allocation
3004 * of descriptors in the sdma_txreq is exhausted.
3005 *
3006 * The code will bump the allocation up to the max
3007 * of MAX_DESC (64) descriptors. There doesn't seem
3008 * much point in an interim step. The last descriptor
3009 * is reserved for coalesce buffer in order to support
3010 * cases where input packet has >MAX_DESC iovecs.
3011 *
3012 */
_extend_sdma_tx_descs(struct hfi1_devdata * dd,struct sdma_txreq * tx)3013 static int _extend_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx)
3014 {
3015 int i;
3016 struct sdma_desc *descp;
3017
3018 /* Handle last descriptor */
3019 if (unlikely((tx->num_desc == (MAX_DESC - 1)))) {
3020 /* if tlen is 0, it is for padding, release last descriptor */
3021 if (!tx->tlen) {
3022 tx->desc_limit = MAX_DESC;
3023 } else if (!tx->coalesce_buf) {
3024 /* allocate coalesce buffer with space for padding */
3025 tx->coalesce_buf = kmalloc(tx->tlen + sizeof(u32),
3026 GFP_ATOMIC);
3027 if (!tx->coalesce_buf)
3028 goto enomem;
3029 tx->coalesce_idx = 0;
3030 }
3031 return 0;
3032 }
3033
3034 if (unlikely(tx->num_desc == MAX_DESC))
3035 goto enomem;
3036
3037 descp = kmalloc_array(MAX_DESC, sizeof(struct sdma_desc), GFP_ATOMIC);
3038 if (!descp)
3039 goto enomem;
3040 tx->descp = descp;
3041
3042 /* reserve last descriptor for coalescing */
3043 tx->desc_limit = MAX_DESC - 1;
3044 /* copy ones already built */
3045 for (i = 0; i < tx->num_desc; i++)
3046 tx->descp[i] = tx->descs[i];
3047 return 0;
3048 enomem:
3049 __sdma_txclean(dd, tx);
3050 return -ENOMEM;
3051 }
3052
3053 /*
3054 * ext_coal_sdma_tx_descs() - extend or coalesce sdma tx descriptors
3055 *
3056 * This is called once the initial nominal allocation of descriptors
3057 * in the sdma_txreq is exhausted.
3058 *
3059 * This function calls _extend_sdma_tx_descs to extend or allocate
3060 * coalesce buffer. If there is a allocated coalesce buffer, it will
3061 * copy the input packet data into the coalesce buffer. It also adds
3062 * coalesce buffer descriptor once when whole packet is received.
3063 *
3064 * Return:
3065 * <0 - error
3066 * 0 - coalescing, don't populate descriptor
3067 * 1 - continue with populating descriptor
3068 */
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)3069 int ext_coal_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx,
3070 int type, void *kvaddr, struct page *page,
3071 unsigned long offset, u16 len)
3072 {
3073 int pad_len, rval;
3074 dma_addr_t addr;
3075
3076 rval = _extend_sdma_tx_descs(dd, tx);
3077 if (rval) {
3078 __sdma_txclean(dd, tx);
3079 return rval;
3080 }
3081
3082 /* If coalesce buffer is allocated, copy data into it */
3083 if (tx->coalesce_buf) {
3084 if (type == SDMA_MAP_NONE) {
3085 __sdma_txclean(dd, tx);
3086 return -EINVAL;
3087 }
3088
3089 if (type == SDMA_MAP_PAGE) {
3090 kvaddr = kmap_local_page(page);
3091 kvaddr += offset;
3092 } else if (WARN_ON(!kvaddr)) {
3093 __sdma_txclean(dd, tx);
3094 return -EINVAL;
3095 }
3096
3097 memcpy(tx->coalesce_buf + tx->coalesce_idx, kvaddr, len);
3098 tx->coalesce_idx += len;
3099 if (type == SDMA_MAP_PAGE)
3100 kunmap_local(kvaddr);
3101
3102 /* If there is more data, return */
3103 if (tx->tlen - tx->coalesce_idx)
3104 return 0;
3105
3106 /* Whole packet is received; add any padding */
3107 pad_len = tx->packet_len & (sizeof(u32) - 1);
3108 if (pad_len) {
3109 pad_len = sizeof(u32) - pad_len;
3110 memset(tx->coalesce_buf + tx->coalesce_idx, 0, pad_len);
3111 /* padding is taken care of for coalescing case */
3112 tx->packet_len += pad_len;
3113 tx->tlen += pad_len;
3114 }
3115
3116 /* dma map the coalesce buffer */
3117 addr = dma_map_single(&dd->pcidev->dev,
3118 tx->coalesce_buf,
3119 tx->tlen,
3120 DMA_TO_DEVICE);
3121
3122 if (unlikely(dma_mapping_error(&dd->pcidev->dev, addr))) {
3123 __sdma_txclean(dd, tx);
3124 return -ENOSPC;
3125 }
3126
3127 /* Add descriptor for coalesce buffer */
3128 tx->desc_limit = MAX_DESC;
3129 return _sdma_txadd_daddr(dd, SDMA_MAP_SINGLE, tx,
3130 addr, tx->tlen, NULL, NULL, NULL);
3131 }
3132
3133 return 1;
3134 }
3135
3136 /* Update sdes when the lmc changes */
sdma_update_lmc(struct hfi1_devdata * dd,u64 mask,u32 lid)3137 void sdma_update_lmc(struct hfi1_devdata *dd, u64 mask, u32 lid)
3138 {
3139 struct sdma_engine *sde;
3140 int i;
3141 u64 sreg;
3142
3143 sreg = ((mask & SD(CHECK_SLID_MASK_MASK)) <<
3144 SD(CHECK_SLID_MASK_SHIFT)) |
3145 (((lid & mask) & SD(CHECK_SLID_VALUE_MASK)) <<
3146 SD(CHECK_SLID_VALUE_SHIFT));
3147
3148 for (i = 0; i < dd->num_sdma; i++) {
3149 hfi1_cdbg(LINKVERB, "SendDmaEngine[%d].SLID_CHECK = 0x%x",
3150 i, (u32)sreg);
3151 sde = &dd->per_sdma[i];
3152 write_sde_csr(sde, SD(CHECK_SLID), sreg);
3153 }
3154 }
3155
3156 /* tx not dword sized - pad */
_pad_sdma_tx_descs(struct hfi1_devdata * dd,struct sdma_txreq * tx)3157 int _pad_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx)
3158 {
3159 int rval = 0;
3160
3161 if ((unlikely(tx->num_desc + 1 == tx->desc_limit))) {
3162 rval = _extend_sdma_tx_descs(dd, tx);
3163 if (rval) {
3164 __sdma_txclean(dd, tx);
3165 return rval;
3166 }
3167 }
3168
3169 /* finish the one just added */
3170 make_tx_sdma_desc(
3171 tx,
3172 SDMA_MAP_NONE,
3173 dd->sdma_pad_phys,
3174 sizeof(u32) - (tx->packet_len & (sizeof(u32) - 1)),
3175 NULL, NULL, NULL);
3176 tx->num_desc++;
3177 _sdma_close_tx(dd, tx);
3178 return rval;
3179 }
3180
3181 /*
3182 * Add ahg to the sdma_txreq
3183 *
3184 * The logic will consume up to 3
3185 * descriptors at the beginning of
3186 * sdma_txreq.
3187 */
_sdma_txreq_ahgadd(struct sdma_txreq * tx,u8 num_ahg,u8 ahg_entry,u32 * ahg,u8 ahg_hlen)3188 void _sdma_txreq_ahgadd(
3189 struct sdma_txreq *tx,
3190 u8 num_ahg,
3191 u8 ahg_entry,
3192 u32 *ahg,
3193 u8 ahg_hlen)
3194 {
3195 u32 i, shift = 0, desc = 0;
3196 u8 mode;
3197
3198 WARN_ON_ONCE(num_ahg > 9 || (ahg_hlen & 3) || ahg_hlen == 4);
3199 /* compute mode */
3200 if (num_ahg == 1)
3201 mode = SDMA_AHG_APPLY_UPDATE1;
3202 else if (num_ahg <= 5)
3203 mode = SDMA_AHG_APPLY_UPDATE2;
3204 else
3205 mode = SDMA_AHG_APPLY_UPDATE3;
3206 tx->num_desc++;
3207 /* initialize to consumed descriptors to zero */
3208 switch (mode) {
3209 case SDMA_AHG_APPLY_UPDATE3:
3210 tx->num_desc++;
3211 tx->descs[2].qw[0] = 0;
3212 tx->descs[2].qw[1] = 0;
3213 fallthrough;
3214 case SDMA_AHG_APPLY_UPDATE2:
3215 tx->num_desc++;
3216 tx->descs[1].qw[0] = 0;
3217 tx->descs[1].qw[1] = 0;
3218 break;
3219 }
3220 ahg_hlen >>= 2;
3221 tx->descs[0].qw[1] |=
3222 (((u64)ahg_entry & SDMA_DESC1_HEADER_INDEX_MASK)
3223 << SDMA_DESC1_HEADER_INDEX_SHIFT) |
3224 (((u64)ahg_hlen & SDMA_DESC1_HEADER_DWS_MASK)
3225 << SDMA_DESC1_HEADER_DWS_SHIFT) |
3226 (((u64)mode & SDMA_DESC1_HEADER_MODE_MASK)
3227 << SDMA_DESC1_HEADER_MODE_SHIFT) |
3228 (((u64)ahg[0] & SDMA_DESC1_HEADER_UPDATE1_MASK)
3229 << SDMA_DESC1_HEADER_UPDATE1_SHIFT);
3230 for (i = 0; i < (num_ahg - 1); i++) {
3231 if (!shift && !(i & 2))
3232 desc++;
3233 tx->descs[desc].qw[!!(i & 2)] |=
3234 (((u64)ahg[i + 1])
3235 << shift);
3236 shift = (shift + 32) & 63;
3237 }
3238 }
3239
3240 /**
3241 * sdma_ahg_alloc - allocate an AHG entry
3242 * @sde: engine to allocate from
3243 *
3244 * Return:
3245 * 0-31 when successful, -EOPNOTSUPP if AHG is not enabled,
3246 * -ENOSPC if an entry is not available
3247 */
sdma_ahg_alloc(struct sdma_engine * sde)3248 int sdma_ahg_alloc(struct sdma_engine *sde)
3249 {
3250 int nr;
3251 int oldbit;
3252
3253 if (!sde) {
3254 trace_hfi1_ahg_allocate(sde, -EINVAL);
3255 return -EINVAL;
3256 }
3257 while (1) {
3258 nr = ffz(READ_ONCE(sde->ahg_bits));
3259 if (nr > 31) {
3260 trace_hfi1_ahg_allocate(sde, -ENOSPC);
3261 return -ENOSPC;
3262 }
3263 oldbit = test_and_set_bit(nr, &sde->ahg_bits);
3264 if (!oldbit)
3265 break;
3266 cpu_relax();
3267 }
3268 trace_hfi1_ahg_allocate(sde, nr);
3269 return nr;
3270 }
3271
3272 /**
3273 * sdma_ahg_free - free an AHG entry
3274 * @sde: engine to return AHG entry
3275 * @ahg_index: index to free
3276 *
3277 * This routine frees the indicate AHG entry.
3278 */
sdma_ahg_free(struct sdma_engine * sde,int ahg_index)3279 void sdma_ahg_free(struct sdma_engine *sde, int ahg_index)
3280 {
3281 if (!sde)
3282 return;
3283 trace_hfi1_ahg_deallocate(sde, ahg_index);
3284 if (ahg_index < 0 || ahg_index > 31)
3285 return;
3286 clear_bit(ahg_index, &sde->ahg_bits);
3287 }
3288
3289 /*
3290 * SPC freeze handling for SDMA engines. Called when the driver knows
3291 * the SPC is going into a freeze but before the freeze is fully
3292 * settled. Generally an error interrupt.
3293 *
3294 * This event will pull the engine out of running so no more entries can be
3295 * added to the engine's queue.
3296 */
sdma_freeze_notify(struct hfi1_devdata * dd,int link_down)3297 void sdma_freeze_notify(struct hfi1_devdata *dd, int link_down)
3298 {
3299 int i;
3300 enum sdma_events event = link_down ? sdma_event_e85_link_down :
3301 sdma_event_e80_hw_freeze;
3302
3303 /* set up the wait but do not wait here */
3304 atomic_set(&dd->sdma_unfreeze_count, dd->num_sdma);
3305
3306 /* tell all engines to stop running and wait */
3307 for (i = 0; i < dd->num_sdma; i++)
3308 sdma_process_event(&dd->per_sdma[i], event);
3309
3310 /* sdma_freeze() will wait for all engines to have stopped */
3311 }
3312
3313 /*
3314 * SPC freeze handling for SDMA engines. Called when the driver knows
3315 * the SPC is fully frozen.
3316 */
sdma_freeze(struct hfi1_devdata * dd)3317 void sdma_freeze(struct hfi1_devdata *dd)
3318 {
3319 int i;
3320 int ret;
3321
3322 /*
3323 * Make sure all engines have moved out of the running state before
3324 * continuing.
3325 */
3326 ret = wait_event_interruptible(dd->sdma_unfreeze_wq,
3327 atomic_read(&dd->sdma_unfreeze_count) <=
3328 0);
3329 /* interrupted or count is negative, then unloading - just exit */
3330 if (ret || atomic_read(&dd->sdma_unfreeze_count) < 0)
3331 return;
3332
3333 /* set up the count for the next wait */
3334 atomic_set(&dd->sdma_unfreeze_count, dd->num_sdma);
3335
3336 /* tell all engines that the SPC is frozen, they can start cleaning */
3337 for (i = 0; i < dd->num_sdma; i++)
3338 sdma_process_event(&dd->per_sdma[i], sdma_event_e81_hw_frozen);
3339
3340 /*
3341 * Wait for everyone to finish software clean before exiting. The
3342 * software clean will read engine CSRs, so must be completed before
3343 * the next step, which will clear the engine CSRs.
3344 */
3345 (void)wait_event_interruptible(dd->sdma_unfreeze_wq,
3346 atomic_read(&dd->sdma_unfreeze_count) <= 0);
3347 /* no need to check results - done no matter what */
3348 }
3349
3350 /*
3351 * SPC freeze handling for the SDMA engines. Called after the SPC is unfrozen.
3352 *
3353 * The SPC freeze acts like a SDMA halt and a hardware clean combined. All
3354 * that is left is a software clean. We could do it after the SPC is fully
3355 * frozen, but then we'd have to add another state to wait for the unfreeze.
3356 * Instead, just defer the software clean until the unfreeze step.
3357 */
sdma_unfreeze(struct hfi1_devdata * dd)3358 void sdma_unfreeze(struct hfi1_devdata *dd)
3359 {
3360 int i;
3361
3362 /* tell all engines start freeze clean up */
3363 for (i = 0; i < dd->num_sdma; i++)
3364 sdma_process_event(&dd->per_sdma[i],
3365 sdma_event_e82_hw_unfreeze);
3366 }
3367
3368 /**
3369 * _sdma_engine_progress_schedule() - schedule progress on engine
3370 * @sde: sdma_engine to schedule progress
3371 *
3372 */
_sdma_engine_progress_schedule(struct sdma_engine * sde)3373 void _sdma_engine_progress_schedule(
3374 struct sdma_engine *sde)
3375 {
3376 trace_hfi1_sdma_engine_progress(sde, sde->progress_mask);
3377 /* assume we have selected a good cpu */
3378 write_csr(sde->dd,
3379 CCE_INT_FORCE + (8 * (IS_SDMA_START / 64)),
3380 sde->progress_mask);
3381 }
3382
