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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / infiniband / hw / ehca / ehca_irq.c
blobb5ca94c6b8d91a603aebff7f907c42f3234bb31e
1 /*
2 * IBM eServer eHCA Infiniband device driver for Linux on POWER
3 *
4 * Functions for EQs, NEQs and interrupts
5 *
6 * Authors: Heiko J Schick <schickhj@de.ibm.com>
7 * Khadija Souissi <souissi@de.ibm.com>
8 * Hoang-Nam Nguyen <hnguyen@de.ibm.com>
9 * Joachim Fenkes <fenkes@de.ibm.com>
10 *
11 * Copyright (c) 2005 IBM Corporation
12 *
13 * All rights reserved.
14 *
15 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
16 * BSD.
17 *
18 * OpenIB BSD License
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions are met:
22 *
23 * Redistributions of source code must retain the above copyright notice, this
24 * list of conditions and the following disclaimer.
25 *
26 * Redistributions in binary form must reproduce the above copyright notice,
27 * this list of conditions and the following disclaimer in the documentation
28 * and/or other materials
29 * provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
32 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
35 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
36 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
37 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
38 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
39 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGE.
42 */
43
44 #include "ehca_classes.h"
45 #include "ehca_irq.h"
46 #include "ehca_iverbs.h"
47 #include "ehca_tools.h"
48 #include "hcp_if.h"
49 #include "hipz_fns.h"
50 #include "ipz_pt_fn.h"
51
52 #define EQE_COMPLETION_EVENT EHCA_BMASK_IBM( 1, 1)
53 #define EQE_CQ_QP_NUMBER EHCA_BMASK_IBM( 8, 31)
54 #define EQE_EE_IDENTIFIER EHCA_BMASK_IBM( 2, 7)
55 #define EQE_CQ_NUMBER EHCA_BMASK_IBM( 8, 31)
56 #define EQE_QP_NUMBER EHCA_BMASK_IBM( 8, 31)
57 #define EQE_QP_TOKEN EHCA_BMASK_IBM(32, 63)
58 #define EQE_CQ_TOKEN EHCA_BMASK_IBM(32, 63)
59
60 #define NEQE_COMPLETION_EVENT EHCA_BMASK_IBM( 1, 1)
61 #define NEQE_EVENT_CODE EHCA_BMASK_IBM( 2, 7)
62 #define NEQE_PORT_NUMBER EHCA_BMASK_IBM( 8, 15)
63 #define NEQE_PORT_AVAILABILITY EHCA_BMASK_IBM(16, 16)
64 #define NEQE_DISRUPTIVE EHCA_BMASK_IBM(16, 16)
65 #define NEQE_SPECIFIC_EVENT EHCA_BMASK_IBM(16, 23)
66
67 #define ERROR_DATA_LENGTH EHCA_BMASK_IBM(52, 63)
68 #define ERROR_DATA_TYPE EHCA_BMASK_IBM( 0, 7)
69
70 static void queue_comp_task(struct ehca_cq *__cq);
71
72 static struct ehca_comp_pool *pool;
73
74 static inline void comp_event_callback(struct ehca_cq *cq)
75 {
76 if (!cq->ib_cq.comp_handler)
77 return;
78
79 spin_lock(&cq->cb_lock);
80 cq->ib_cq.comp_handler(&cq->ib_cq, cq->ib_cq.cq_context);
81 spin_unlock(&cq->cb_lock);
82
83 return;
84 }
85
86 static void print_error_data(struct ehca_shca *shca, void *data,
87 u64 *rblock, int length)
88 {
89 u64 type = EHCA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
90 u64 resource = rblock[1];
91
92 switch (type) {
93 case 0x1: /* Queue Pair */
94 {
95 struct ehca_qp *qp = (struct ehca_qp *)data;
96
97 /* only print error data if AER is set */
98 if (rblock[6] == 0)
99 return;
100
101 ehca_err(&shca->ib_device,
102 "QP 0x%x (resource=%lx) has errors.",
103 qp->ib_qp.qp_num, resource);
104 break;
105 }
106 case 0x4: /* Completion Queue */
107 {
108 struct ehca_cq *cq = (struct ehca_cq *)data;
109
110 ehca_err(&shca->ib_device,
111 "CQ 0x%x (resource=%lx) has errors.",
112 cq->cq_number, resource);
113 break;
114 }
115 default:
116 ehca_err(&shca->ib_device,
117 "Unknown error type: %lx on %s.",
118 type, shca->ib_device.name);
119 break;
120 }
121
122 ehca_err(&shca->ib_device, "Error data is available: %lx.", resource);
123 ehca_err(&shca->ib_device, "EHCA ----- error data begin "
124 "---------------------------------------------------");
125 ehca_dmp(rblock, length, "resource=%lx", resource);
126 ehca_err(&shca->ib_device, "EHCA ----- error data end "
127 "----------------------------------------------------");
128
129 return;
130 }
131
132 int ehca_error_data(struct ehca_shca *shca, void *data,
133 u64 resource)
134 {
135
136 unsigned long ret;
137 u64 *rblock;
138 unsigned long block_count;
139
140 rblock = ehca_alloc_fw_ctrlblock(GFP_ATOMIC);
141 if (!rblock) {
142 ehca_err(&shca->ib_device, "Cannot allocate rblock memory.");
143 ret = -ENOMEM;
144 goto error_data1;
145 }
146
147 /* rblock must be 4K aligned and should be 4K large */
148 ret = hipz_h_error_data(shca->ipz_hca_handle,
149 resource,
150 rblock,
151 &block_count);
152
153 if (ret == H_R_STATE)
154 ehca_err(&shca->ib_device,
155 "No error data is available: %lx.", resource);
156 else if (ret == H_SUCCESS) {
157 int length;
158
159 length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]);
160
161 if (length > EHCA_PAGESIZE)
162 length = EHCA_PAGESIZE;
163
164 print_error_data(shca, data, rblock, length);
165 } else
166 ehca_err(&shca->ib_device,
167 "Error data could not be fetched: %lx", resource);
168
169 ehca_free_fw_ctrlblock(rblock);
170
171 error_data1:
172 return ret;
173
174 }
175
176 static void dispatch_qp_event(struct ehca_shca *shca, struct ehca_qp *qp,
177 enum ib_event_type event_type)
178 {
179 struct ib_event event;
180
181 event.device = &shca->ib_device;
182 event.event = event_type;
183
184 if (qp->ext_type == EQPT_SRQ) {
185 if (!qp->ib_srq.event_handler)
186 return;
187
188 event.element.srq = &qp->ib_srq;
189 qp->ib_srq.event_handler(&event, qp->ib_srq.srq_context);
190 } else {
191 if (!qp->ib_qp.event_handler)
192 return;
193
194 event.element.qp = &qp->ib_qp;
195 qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context);
196 }
197 }
198
199 static void qp_event_callback(struct ehca_shca *shca, u64 eqe,
200 enum ib_event_type event_type, int fatal)
201 {
202 struct ehca_qp *qp;
203 u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
204
205 read_lock(&ehca_qp_idr_lock);
206 qp = idr_find(&ehca_qp_idr, token);
207 read_unlock(&ehca_qp_idr_lock);
208
209 if (!qp)
210 return;
211
212 if (fatal)
213 ehca_error_data(shca, qp, qp->ipz_qp_handle.handle);
214
215 dispatch_qp_event(shca, qp, fatal && qp->ext_type == EQPT_SRQ ?
216 IB_EVENT_SRQ_ERR : event_type);
217
218 /*
219 * eHCA only processes one WQE at a time for SRQ base QPs,
220 * so the last WQE has been processed as soon as the QP enters
221 * error state.
222 */
223 if (fatal && qp->ext_type == EQPT_SRQBASE)
224 dispatch_qp_event(shca, qp, IB_EVENT_QP_LAST_WQE_REACHED);
225
226 return;
227 }
228
229 static void cq_event_callback(struct ehca_shca *shca,
230 u64 eqe)
231 {
232 struct ehca_cq *cq;
233 u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
234
235 read_lock(&ehca_cq_idr_lock);
236 cq = idr_find(&ehca_cq_idr, token);
237 if (cq)
238 atomic_inc(&cq->nr_events);
239 read_unlock(&ehca_cq_idr_lock);
240
241 if (!cq)
242 return;
243
244 ehca_error_data(shca, cq, cq->ipz_cq_handle.handle);
245
246 if (atomic_dec_and_test(&cq->nr_events))
247 wake_up(&cq->wait_completion);
248
249 return;
250 }
251
252 static void parse_identifier(struct ehca_shca *shca, u64 eqe)
253 {
254 u8 identifier = EHCA_BMASK_GET(EQE_EE_IDENTIFIER, eqe);
255
256 switch (identifier) {
257 case 0x02: /* path migrated */
258 qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG, 0);
259 break;
260 case 0x03: /* communication established */
261 qp_event_callback(shca, eqe, IB_EVENT_COMM_EST, 0);
262 break;
263 case 0x04: /* send queue drained */
264 qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED, 0);
265 break;
266 case 0x05: /* QP error */
267 case 0x06: /* QP error */
268 qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL, 1);
269 break;
270 case 0x07: /* CQ error */
271 case 0x08: /* CQ error */
272 cq_event_callback(shca, eqe);
273 break;
274 case 0x09: /* MRMWPTE error */
275 ehca_err(&shca->ib_device, "MRMWPTE error.");
276 break;
277 case 0x0A: /* port event */
278 ehca_err(&shca->ib_device, "Port event.");
279 break;
280 case 0x0B: /* MR access error */
281 ehca_err(&shca->ib_device, "MR access error.");
282 break;
283 case 0x0C: /* EQ error */
284 ehca_err(&shca->ib_device, "EQ error.");
285 break;
286 case 0x0D: /* P/Q_Key mismatch */
287 ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
288 break;
289 case 0x10: /* sampling complete */
290 ehca_err(&shca->ib_device, "Sampling complete.");
291 break;
292 case 0x11: /* unaffiliated access error */
293 ehca_err(&shca->ib_device, "Unaffiliated access error.");
294 break;
295 case 0x12: /* path migrating */
296 ehca_err(&shca->ib_device, "Path migrating.");
297 break;
298 case 0x13: /* interface trace stopped */
299 ehca_err(&shca->ib_device, "Interface trace stopped.");
300 break;
301 case 0x14: /* first error capture info available */
302 ehca_info(&shca->ib_device, "First error capture available");
303 break;
304 case 0x15: /* SRQ limit reached */
305 qp_event_callback(shca, eqe, IB_EVENT_SRQ_LIMIT_REACHED, 0);
306 break;
307 default:
308 ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.",
309 identifier, shca->ib_device.name);
310 break;
311 }
312
313 return;
314 }
315
316 static void dispatch_port_event(struct ehca_shca *shca, int port_num,
317 enum ib_event_type type, const char *msg)
318 {
319 struct ib_event event;
320
321 ehca_info(&shca->ib_device, "port %d %s.", port_num, msg);
322 event.device = &shca->ib_device;
323 event.event = type;
324 event.element.port_num = port_num;
325 ib_dispatch_event(&event);
326 }
327
328 static void notify_port_conf_change(struct ehca_shca *shca, int port_num)
329 {
330 struct ehca_sma_attr new_attr;
331 struct ehca_sma_attr *old_attr = &shca->sport[port_num - 1].saved_attr;
332
333 ehca_query_sma_attr(shca, port_num, &new_attr);
334
335 if (new_attr.sm_sl != old_attr->sm_sl ||
336 new_attr.sm_lid != old_attr->sm_lid)
337 dispatch_port_event(shca, port_num, IB_EVENT_SM_CHANGE,
338 "SM changed");
339
340 if (new_attr.lid != old_attr->lid ||
341 new_attr.lmc != old_attr->lmc)
342 dispatch_port_event(shca, port_num, IB_EVENT_LID_CHANGE,
343 "LID changed");
344
345 if (new_attr.pkey_tbl_len != old_attr->pkey_tbl_len ||
346 memcmp(new_attr.pkeys, old_attr->pkeys,
347 sizeof(u16) * new_attr.pkey_tbl_len))
348 dispatch_port_event(shca, port_num, IB_EVENT_PKEY_CHANGE,
349 "P_Key changed");
350
351 *old_attr = new_attr;
352 }
353
354 static void parse_ec(struct ehca_shca *shca, u64 eqe)
355 {
356 u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
357 u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
358 u8 spec_event;
359 struct ehca_sport *sport = &shca->sport[port - 1];
360 unsigned long flags;
361
362 switch (ec) {
363 case 0x30: /* port availability change */
364 if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
365 int suppress_event;
366 /* replay modify_qp for sqps */
367 spin_lock_irqsave(&sport->mod_sqp_lock, flags);
368 suppress_event = !sport->ibqp_sqp[IB_QPT_GSI];
369 if (sport->ibqp_sqp[IB_QPT_SMI])
370 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_SMI]);
371 if (!suppress_event)
372 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_GSI]);
373 spin_unlock_irqrestore(&sport->mod_sqp_lock, flags);
374
375 /* AQP1 was destroyed, ignore this event */
376 if (suppress_event)
377 break;
378
379 sport->port_state = IB_PORT_ACTIVE;
380 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
381 "is active");
382 ehca_query_sma_attr(shca, port,
383 &sport->saved_attr);
384 } else {
385 sport->port_state = IB_PORT_DOWN;
386 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
387 "is inactive");
388 }
389 break;
390 case 0x31:
391 /* port configuration change
392 * disruptive change is caused by
393 * LID, PKEY or SM change
394 */
395 if (EHCA_BMASK_GET(NEQE_DISRUPTIVE, eqe)) {
396 ehca_warn(&shca->ib_device, "disruptive port "
397 "%d configuration change", port);
398
399 sport->port_state = IB_PORT_DOWN;
400 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
401 "is inactive");
402
403 sport->port_state = IB_PORT_ACTIVE;
404 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
405 "is active");
406 ehca_query_sma_attr(shca, port,
407 &sport->saved_attr);
408 } else
409 notify_port_conf_change(shca, port);
410 break;
411 case 0x32: /* adapter malfunction */
412 ehca_err(&shca->ib_device, "Adapter malfunction.");
413 break;
414 case 0x33: /* trace stopped */
415 ehca_err(&shca->ib_device, "Traced stopped.");
416 break;
417 case 0x34: /* util async event */
418 spec_event = EHCA_BMASK_GET(NEQE_SPECIFIC_EVENT, eqe);
419 if (spec_event == 0x80) /* client reregister required */
420 dispatch_port_event(shca, port,
421 IB_EVENT_CLIENT_REREGISTER,
422 "client reregister req.");
423 else
424 ehca_warn(&shca->ib_device, "Unknown util async "
425 "event %x on port %x", spec_event, port);
426 break;
427 default:
428 ehca_err(&shca->ib_device, "Unknown event code: %x on %s.",
429 ec, shca->ib_device.name);
430 break;
431 }
432
433 return;
434 }
435
436 static inline void reset_eq_pending(struct ehca_cq *cq)
437 {
438 u64 CQx_EP;
439 struct h_galpa gal = cq->galpas.kernel;
440
441 hipz_galpa_store_cq(gal, cqx_ep, 0x0);
442 CQx_EP = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_ep));
443
444 return;
445 }
446
447 irqreturn_t ehca_interrupt_neq(int irq, void *dev_id)
448 {
449 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
450
451 tasklet_hi_schedule(&shca->neq.interrupt_task);
452
453 return IRQ_HANDLED;
454 }
455
456 void ehca_tasklet_neq(unsigned long data)
457 {
458 struct ehca_shca *shca = (struct ehca_shca*)data;
459 struct ehca_eqe *eqe;
460 u64 ret;
461
462 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
463
464 while (eqe) {
465 if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry))
466 parse_ec(shca, eqe->entry);
467
468 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
469 }
470
471 ret = hipz_h_reset_event(shca->ipz_hca_handle,
472 shca->neq.ipz_eq_handle, 0xFFFFFFFFFFFFFFFFL);
473
474 if (ret != H_SUCCESS)
475 ehca_err(&shca->ib_device, "Can't clear notification events.");
476
477 return;
478 }
479
480 irqreturn_t ehca_interrupt_eq(int irq, void *dev_id)
481 {
482 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
483
484 tasklet_hi_schedule(&shca->eq.interrupt_task);
485
486 return IRQ_HANDLED;
487 }
488
489
490 static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe)
491 {
492 u64 eqe_value;
493 u32 token;
494 struct ehca_cq *cq;
495
496 eqe_value = eqe->entry;
497 ehca_dbg(&shca->ib_device, "eqe_value=%lx", eqe_value);
498 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
499 ehca_dbg(&shca->ib_device, "Got completion event");
500 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
501 read_lock(&ehca_cq_idr_lock);
502 cq = idr_find(&ehca_cq_idr, token);
503 if (cq)
504 atomic_inc(&cq->nr_events);
505 read_unlock(&ehca_cq_idr_lock);
506 if (cq == NULL) {
507 ehca_err(&shca->ib_device,
508 "Invalid eqe for non-existing cq token=%x",
509 token);
510 return;
511 }
512 reset_eq_pending(cq);
513 if (ehca_scaling_code)
514 queue_comp_task(cq);
515 else {
516 comp_event_callback(cq);
517 if (atomic_dec_and_test(&cq->nr_events))
518 wake_up(&cq->wait_completion);
519 }
520 } else {
521 ehca_dbg(&shca->ib_device, "Got non completion event");
522 parse_identifier(shca, eqe_value);
523 }
524 }
525
526 void ehca_process_eq(struct ehca_shca *shca, int is_irq)
527 {
528 struct ehca_eq *eq = &shca->eq;
529 struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
530 u64 eqe_value;
531 unsigned long flags;
532 int eqe_cnt, i;
533 int eq_empty = 0;
534
535 spin_lock_irqsave(&eq->irq_spinlock, flags);
536 if (is_irq) {
537 const int max_query_cnt = 100;
538 int query_cnt = 0;
539 int int_state = 1;
540 do {
541 int_state = hipz_h_query_int_state(
542 shca->ipz_hca_handle, eq->ist);
543 query_cnt++;
544 iosync();
545 } while (int_state && query_cnt < max_query_cnt);
546 if (unlikely((query_cnt == max_query_cnt)))
547 ehca_dbg(&shca->ib_device, "int_state=%x query_cnt=%x",
548 int_state, query_cnt);
549 }
550
551 /* read out all eqes */
552 eqe_cnt = 0;
553 do {
554 u32 token;
555 eqe_cache[eqe_cnt].eqe =
556 (struct ehca_eqe *)ehca_poll_eq(shca, eq);
557 if (!eqe_cache[eqe_cnt].eqe)
558 break;
559 eqe_value = eqe_cache[eqe_cnt].eqe->entry;
560 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
561 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
562 read_lock(&ehca_cq_idr_lock);
563 eqe_cache[eqe_cnt].cq = idr_find(&ehca_cq_idr, token);
564 if (eqe_cache[eqe_cnt].cq)
565 atomic_inc(&eqe_cache[eqe_cnt].cq->nr_events);
566 read_unlock(&ehca_cq_idr_lock);
567 if (!eqe_cache[eqe_cnt].cq) {
568 ehca_err(&shca->ib_device,
569 "Invalid eqe for non-existing cq "
570 "token=%x", token);
571 continue;
572 }
573 } else
574 eqe_cache[eqe_cnt].cq = NULL;
575 eqe_cnt++;
576 } while (eqe_cnt < EHCA_EQE_CACHE_SIZE);
577 if (!eqe_cnt) {
578 if (is_irq)
579 ehca_dbg(&shca->ib_device,
580 "No eqe found for irq event");
581 goto unlock_irq_spinlock;
582 } else if (!is_irq)
583 ehca_dbg(&shca->ib_device, "deadman found %x eqe", eqe_cnt);
584 if (unlikely(eqe_cnt == EHCA_EQE_CACHE_SIZE))
585 ehca_dbg(&shca->ib_device, "too many eqes for one irq event");
586 /* enable irq for new packets */
587 for (i = 0; i < eqe_cnt; i++) {
588 if (eq->eqe_cache[i].cq)
589 reset_eq_pending(eq->eqe_cache[i].cq);
590 }
591 /* check eq */
592 spin_lock(&eq->spinlock);
593 eq_empty = (!ipz_eqit_eq_peek_valid(&shca->eq.ipz_queue));
594 spin_unlock(&eq->spinlock);
595 /* call completion handler for cached eqes */
596 for (i = 0; i < eqe_cnt; i++)
597 if (eq->eqe_cache[i].cq) {
598 if (ehca_scaling_code)
599 queue_comp_task(eq->eqe_cache[i].cq);
600 else {
601 struct ehca_cq *cq = eq->eqe_cache[i].cq;
602 comp_event_callback(cq);
603 if (atomic_dec_and_test(&cq->nr_events))
604 wake_up(&cq->wait_completion);
605 }
606 } else {
607 ehca_dbg(&shca->ib_device, "Got non completion event");
608 parse_identifier(shca, eq->eqe_cache[i].eqe->entry);
609 }
610 /* poll eq if not empty */
611 if (eq_empty)
612 goto unlock_irq_spinlock;
613 do {
614 struct ehca_eqe *eqe;
615 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
616 if (!eqe)
617 break;
618 process_eqe(shca, eqe);
619 } while (1);
620
621 unlock_irq_spinlock:
622 spin_unlock_irqrestore(&eq->irq_spinlock, flags);
623 }
624
625 void ehca_tasklet_eq(unsigned long data)
626 {
627 ehca_process_eq((struct ehca_shca*)data, 1);
628 }
629
630 static inline int find_next_online_cpu(struct ehca_comp_pool *pool)
631 {
632 int cpu;
633 unsigned long flags;
634
635 WARN_ON_ONCE(!in_interrupt());
636 if (ehca_debug_level)
637 ehca_dmp(&cpu_online_map, sizeof(cpumask_t), "");
638
639 spin_lock_irqsave(&pool->last_cpu_lock, flags);
640 cpu = next_cpu(pool->last_cpu, cpu_online_map);
641 if (cpu == NR_CPUS)
642 cpu = first_cpu(cpu_online_map);
643 pool->last_cpu = cpu;
644 spin_unlock_irqrestore(&pool->last_cpu_lock, flags);
645
646 return cpu;
647 }
648
649 static void __queue_comp_task(struct ehca_cq *__cq,
650 struct ehca_cpu_comp_task *cct)
651 {
652 unsigned long flags;
653
654 spin_lock_irqsave(&cct->task_lock, flags);
655 spin_lock(&__cq->task_lock);
656
657 if (__cq->nr_callbacks == 0) {
658 __cq->nr_callbacks++;
659 list_add_tail(&__cq->entry, &cct->cq_list);
660 cct->cq_jobs++;
661 wake_up(&cct->wait_queue);
662 } else
663 __cq->nr_callbacks++;
664
665 spin_unlock(&__cq->task_lock);
666 spin_unlock_irqrestore(&cct->task_lock, flags);
667 }
668
669 static void queue_comp_task(struct ehca_cq *__cq)
670 {
671 int cpu_id;
672 struct ehca_cpu_comp_task *cct;
673 int cq_jobs;
674 unsigned long flags;
675
676 cpu_id = find_next_online_cpu(pool);
677 BUG_ON(!cpu_online(cpu_id));
678
679 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
680 BUG_ON(!cct);
681
682 spin_lock_irqsave(&cct->task_lock, flags);
683 cq_jobs = cct->cq_jobs;
684 spin_unlock_irqrestore(&cct->task_lock, flags);
685 if (cq_jobs > 0) {
686 cpu_id = find_next_online_cpu(pool);
687 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
688 BUG_ON(!cct);
689 }
690
691 __queue_comp_task(__cq, cct);
692 }
693
694 static void run_comp_task(struct ehca_cpu_comp_task *cct)
695 {
696 struct ehca_cq *cq;
697 unsigned long flags;
698
699 spin_lock_irqsave(&cct->task_lock, flags);
700
701 while (!list_empty(&cct->cq_list)) {
702 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
703 spin_unlock_irqrestore(&cct->task_lock, flags);
704
705 comp_event_callback(cq);
706 if (atomic_dec_and_test(&cq->nr_events))
707 wake_up(&cq->wait_completion);
708
709 spin_lock_irqsave(&cct->task_lock, flags);
710 spin_lock(&cq->task_lock);
711 cq->nr_callbacks--;
712 if (!cq->nr_callbacks) {
713 list_del_init(cct->cq_list.next);
714 cct->cq_jobs--;
715 }
716 spin_unlock(&cq->task_lock);
717 }
718
719 spin_unlock_irqrestore(&cct->task_lock, flags);
720 }
721
722 static int comp_task(void *__cct)
723 {
724 struct ehca_cpu_comp_task *cct = __cct;
725 int cql_empty;
726 DECLARE_WAITQUEUE(wait, current);
727
728 set_current_state(TASK_INTERRUPTIBLE);
729 while (!kthread_should_stop()) {
730 add_wait_queue(&cct->wait_queue, &wait);
731
732 spin_lock_irq(&cct->task_lock);
733 cql_empty = list_empty(&cct->cq_list);
734 spin_unlock_irq(&cct->task_lock);
735 if (cql_empty)
736 schedule();
737 else
738 __set_current_state(TASK_RUNNING);
739
740 remove_wait_queue(&cct->wait_queue, &wait);
741
742 spin_lock_irq(&cct->task_lock);
743 cql_empty = list_empty(&cct->cq_list);
744 spin_unlock_irq(&cct->task_lock);
745 if (!cql_empty)
746 run_comp_task(__cct);
747
748 set_current_state(TASK_INTERRUPTIBLE);
749 }
750 __set_current_state(TASK_RUNNING);
751
752 return 0;
753 }
754
755 static struct task_struct *create_comp_task(struct ehca_comp_pool *pool,
756 int cpu)
757 {
758 struct ehca_cpu_comp_task *cct;
759
760 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
761 spin_lock_init(&cct->task_lock);
762 INIT_LIST_HEAD(&cct->cq_list);
763 init_waitqueue_head(&cct->wait_queue);
764 cct->task = kthread_create(comp_task, cct, "ehca_comp/%d", cpu);
765
766 return cct->task;
767 }
768
769 static void destroy_comp_task(struct ehca_comp_pool *pool,
770 int cpu)
771 {
772 struct ehca_cpu_comp_task *cct;
773 struct task_struct *task;
774 unsigned long flags_cct;
775
776 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
777
778 spin_lock_irqsave(&cct->task_lock, flags_cct);
779
780 task = cct->task;
781 cct->task = NULL;
782 cct->cq_jobs = 0;
783
784 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
785
786 if (task)
787 kthread_stop(task);
788 }
789
790 static void __cpuinit take_over_work(struct ehca_comp_pool *pool, int cpu)
791 {
792 struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
793 LIST_HEAD(list);
794 struct ehca_cq *cq;
795 unsigned long flags_cct;
796
797 spin_lock_irqsave(&cct->task_lock, flags_cct);
798
799 list_splice_init(&cct->cq_list, &list);
800
801 while (!list_empty(&list)) {
802 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
803
804 list_del(&cq->entry);
805 __queue_comp_task(cq, per_cpu_ptr(pool->cpu_comp_tasks,
806 smp_processor_id()));
807 }
808
809 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
810
811 }
812
813 static int __cpuinit comp_pool_callback(struct notifier_block *nfb,
814 unsigned long action,
815 void *hcpu)
816 {
817 unsigned int cpu = (unsigned long)hcpu;
818 struct ehca_cpu_comp_task *cct;
819
820 switch (action) {
821 case CPU_UP_PREPARE:
822 case CPU_UP_PREPARE_FROZEN:
823 ehca_gen_dbg("CPU: %x (CPU_PREPARE)", cpu);
824 if (!create_comp_task(pool, cpu)) {
825 ehca_gen_err("Can't create comp_task for cpu: %x", cpu);
826 return NOTIFY_BAD;
827 }
828 break;
829 case CPU_UP_CANCELED:
830 case CPU_UP_CANCELED_FROZEN:
831 ehca_gen_dbg("CPU: %x (CPU_CANCELED)", cpu);
832 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
833 kthread_bind(cct->task, any_online_cpu(cpu_online_map));
834 destroy_comp_task(pool, cpu);
835 break;
836 case CPU_ONLINE:
837 case CPU_ONLINE_FROZEN:
838 ehca_gen_dbg("CPU: %x (CPU_ONLINE)", cpu);
839 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
840 kthread_bind(cct->task, cpu);
841 wake_up_process(cct->task);
842 break;
843 case CPU_DOWN_PREPARE:
844 case CPU_DOWN_PREPARE_FROZEN:
845 ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
846 break;
847 case CPU_DOWN_FAILED:
848 case CPU_DOWN_FAILED_FROZEN:
849 ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
850 break;
851 case CPU_DEAD:
852 case CPU_DEAD_FROZEN:
853 ehca_gen_dbg("CPU: %x (CPU_DEAD)", cpu);
854 destroy_comp_task(pool, cpu);
855 take_over_work(pool, cpu);
856 break;
857 }
858
859 return NOTIFY_OK;
860 }
861
862 static struct notifier_block comp_pool_callback_nb __cpuinitdata = {
863 .notifier_call = comp_pool_callback,
864 .priority = 0,
865 };
866
867 int ehca_create_comp_pool(void)
868 {
869 int cpu;
870 struct task_struct *task;
871
872 if (!ehca_scaling_code)
873 return 0;
874
875 pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
876 if (pool == NULL)
877 return -ENOMEM;
878
879 spin_lock_init(&pool->last_cpu_lock);
880 pool->last_cpu = any_online_cpu(cpu_online_map);
881
882 pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task);
883 if (pool->cpu_comp_tasks == NULL) {
884 kfree(pool);
885 return -EINVAL;
886 }
887
888 for_each_online_cpu(cpu) {
889 task = create_comp_task(pool, cpu);
890 if (task) {
891 kthread_bind(task, cpu);
892 wake_up_process(task);
893 }
894 }
895
896 register_hotcpu_notifier(&comp_pool_callback_nb);
897
898 printk(KERN_INFO "eHCA scaling code enabled\n");
899
900 return 0;
901 }
902
903 void ehca_destroy_comp_pool(void)
904 {
905 int i;
906
907 if (!ehca_scaling_code)
908 return;
909
910 unregister_hotcpu_notifier(&comp_pool_callback_nb);
911
912 for (i = 0; i < NR_CPUS; i++) {
913 if (cpu_online(i))
914 destroy_comp_task(pool, i);
915 }
916 free_percpu(pool->cpu_comp_tasks);
917 kfree(pool);
918 }
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