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
comp_event_callback(struct ehca_cq * cq)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
print_error_data(struct ehca_shca * shca,void * data,u64 * rblock,int length)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=%llx) 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=%llx) has errors.",
112 cq->cq_number, resource);
113 break;
114 }
115 default:
116 ehca_err(&shca->ib_device,
117 "Unknown error type: %llx on %s.",
118 type, shca->ib_device.name);
119 break;
120 }
121
122 ehca_err(&shca->ib_device, "Error data is available: %llx.", resource);
123 ehca_err(&shca->ib_device, "EHCA ----- error data begin "
124 "---------------------------------------------------");
125 ehca_dmp(rblock, length, "resource=%llx", resource);
126 ehca_err(&shca->ib_device, "EHCA ----- error data end "
127 "----------------------------------------------------");
128
129 return;
130 }
131
ehca_error_data(struct ehca_shca * shca,void * data,u64 resource)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: %llx.", 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: %llx", resource);
168
169 ehca_free_fw_ctrlblock(rblock);
170
171 error_data1:
172 return ret;
173
174 }
175
dispatch_qp_event(struct ehca_shca * shca,struct ehca_qp * qp,enum ib_event_type event_type)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 /* PATH_MIG without the QP ever having been armed is false alarm */
182 if (event_type == IB_EVENT_PATH_MIG && !qp->mig_armed)
183 return;
184
185 event.device = &shca->ib_device;
186 event.event = event_type;
187
188 if (qp->ext_type == EQPT_SRQ) {
189 if (!qp->ib_srq.event_handler)
190 return;
191
192 event.element.srq = &qp->ib_srq;
193 qp->ib_srq.event_handler(&event, qp->ib_srq.srq_context);
194 } else {
195 if (!qp->ib_qp.event_handler)
196 return;
197
198 event.element.qp = &qp->ib_qp;
199 qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context);
200 }
201 }
202
qp_event_callback(struct ehca_shca * shca,u64 eqe,enum ib_event_type event_type,int fatal)203 static void qp_event_callback(struct ehca_shca *shca, u64 eqe,
204 enum ib_event_type event_type, int fatal)
205 {
206 struct ehca_qp *qp;
207 u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
208
209 read_lock(&ehca_qp_idr_lock);
210 qp = idr_find(&ehca_qp_idr, token);
211 if (qp)
212 atomic_inc(&qp->nr_events);
213 read_unlock(&ehca_qp_idr_lock);
214
215 if (!qp)
216 return;
217
218 if (fatal)
219 ehca_error_data(shca, qp, qp->ipz_qp_handle.handle);
220
221 dispatch_qp_event(shca, qp, fatal && qp->ext_type == EQPT_SRQ ?
222 IB_EVENT_SRQ_ERR : event_type);
223
224 /*
225 * eHCA only processes one WQE at a time for SRQ base QPs,
226 * so the last WQE has been processed as soon as the QP enters
227 * error state.
228 */
229 if (fatal && qp->ext_type == EQPT_SRQBASE)
230 dispatch_qp_event(shca, qp, IB_EVENT_QP_LAST_WQE_REACHED);
231
232 if (atomic_dec_and_test(&qp->nr_events))
233 wake_up(&qp->wait_completion);
234 return;
235 }
236
cq_event_callback(struct ehca_shca * shca,u64 eqe)237 static void cq_event_callback(struct ehca_shca *shca,
238 u64 eqe)
239 {
240 struct ehca_cq *cq;
241 u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
242
243 read_lock(&ehca_cq_idr_lock);
244 cq = idr_find(&ehca_cq_idr, token);
245 if (cq)
246 atomic_inc(&cq->nr_events);
247 read_unlock(&ehca_cq_idr_lock);
248
249 if (!cq)
250 return;
251
252 ehca_error_data(shca, cq, cq->ipz_cq_handle.handle);
253
254 if (atomic_dec_and_test(&cq->nr_events))
255 wake_up(&cq->wait_completion);
256
257 return;
258 }
259
parse_identifier(struct ehca_shca * shca,u64 eqe)260 static void parse_identifier(struct ehca_shca *shca, u64 eqe)
261 {
262 u8 identifier = EHCA_BMASK_GET(EQE_EE_IDENTIFIER, eqe);
263
264 switch (identifier) {
265 case 0x02: /* path migrated */
266 qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG, 0);
267 break;
268 case 0x03: /* communication established */
269 qp_event_callback(shca, eqe, IB_EVENT_COMM_EST, 0);
270 break;
271 case 0x04: /* send queue drained */
272 qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED, 0);
273 break;
274 case 0x05: /* QP error */
275 case 0x06: /* QP error */
276 qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL, 1);
277 break;
278 case 0x07: /* CQ error */
279 case 0x08: /* CQ error */
280 cq_event_callback(shca, eqe);
281 break;
282 case 0x09: /* MRMWPTE error */
283 ehca_err(&shca->ib_device, "MRMWPTE error.");
284 break;
285 case 0x0A: /* port event */
286 ehca_err(&shca->ib_device, "Port event.");
287 break;
288 case 0x0B: /* MR access error */
289 ehca_err(&shca->ib_device, "MR access error.");
290 break;
291 case 0x0C: /* EQ error */
292 ehca_err(&shca->ib_device, "EQ error.");
293 break;
294 case 0x0D: /* P/Q_Key mismatch */
295 ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
296 break;
297 case 0x10: /* sampling complete */
298 ehca_err(&shca->ib_device, "Sampling complete.");
299 break;
300 case 0x11: /* unaffiliated access error */
301 ehca_err(&shca->ib_device, "Unaffiliated access error.");
302 break;
303 case 0x12: /* path migrating */
304 ehca_err(&shca->ib_device, "Path migrating.");
305 break;
306 case 0x13: /* interface trace stopped */
307 ehca_err(&shca->ib_device, "Interface trace stopped.");
308 break;
309 case 0x14: /* first error capture info available */
310 ehca_info(&shca->ib_device, "First error capture available");
311 break;
312 case 0x15: /* SRQ limit reached */
313 qp_event_callback(shca, eqe, IB_EVENT_SRQ_LIMIT_REACHED, 0);
314 break;
315 default:
316 ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.",
317 identifier, shca->ib_device.name);
318 break;
319 }
320
321 return;
322 }
323
dispatch_port_event(struct ehca_shca * shca,int port_num,enum ib_event_type type,const char * msg)324 static void dispatch_port_event(struct ehca_shca *shca, int port_num,
325 enum ib_event_type type, const char *msg)
326 {
327 struct ib_event event;
328
329 ehca_info(&shca->ib_device, "port %d %s.", port_num, msg);
330 event.device = &shca->ib_device;
331 event.event = type;
332 event.element.port_num = port_num;
333 ib_dispatch_event(&event);
334 }
335
notify_port_conf_change(struct ehca_shca * shca,int port_num)336 static void notify_port_conf_change(struct ehca_shca *shca, int port_num)
337 {
338 struct ehca_sma_attr new_attr;
339 struct ehca_sma_attr *old_attr = &shca->sport[port_num - 1].saved_attr;
340
341 ehca_query_sma_attr(shca, port_num, &new_attr);
342
343 if (new_attr.sm_sl != old_attr->sm_sl ||
344 new_attr.sm_lid != old_attr->sm_lid)
345 dispatch_port_event(shca, port_num, IB_EVENT_SM_CHANGE,
346 "SM changed");
347
348 if (new_attr.lid != old_attr->lid ||
349 new_attr.lmc != old_attr->lmc)
350 dispatch_port_event(shca, port_num, IB_EVENT_LID_CHANGE,
351 "LID changed");
352
353 if (new_attr.pkey_tbl_len != old_attr->pkey_tbl_len ||
354 memcmp(new_attr.pkeys, old_attr->pkeys,
355 sizeof(u16) * new_attr.pkey_tbl_len))
356 dispatch_port_event(shca, port_num, IB_EVENT_PKEY_CHANGE,
357 "P_Key changed");
358
359 *old_attr = new_attr;
360 }
361
362 /* replay modify_qp for sqps -- return 0 if all is well, 1 if AQP1 destroyed */
replay_modify_qp(struct ehca_sport * sport)363 static int replay_modify_qp(struct ehca_sport *sport)
364 {
365 int aqp1_destroyed;
366 unsigned long flags;
367
368 spin_lock_irqsave(&sport->mod_sqp_lock, flags);
369
370 aqp1_destroyed = !sport->ibqp_sqp[IB_QPT_GSI];
371
372 if (sport->ibqp_sqp[IB_QPT_SMI])
373 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_SMI]);
374 if (!aqp1_destroyed)
375 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_GSI]);
376
377 spin_unlock_irqrestore(&sport->mod_sqp_lock, flags);
378
379 return aqp1_destroyed;
380 }
381
parse_ec(struct ehca_shca * shca,u64 eqe)382 static void parse_ec(struct ehca_shca *shca, u64 eqe)
383 {
384 u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
385 u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
386 u8 spec_event;
387 struct ehca_sport *sport = &shca->sport[port - 1];
388
389 switch (ec) {
390 case 0x30: /* port availability change */
391 if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
392 /* only replay modify_qp calls in autodetect mode;
393 * if AQP1 was destroyed, the port is already down
394 * again and we can drop the event.
395 */
396 if (ehca_nr_ports < 0)
397 if (replay_modify_qp(sport))
398 break;
399
400 sport->port_state = IB_PORT_ACTIVE;
401 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
402 "is active");
403 ehca_query_sma_attr(shca, port, &sport->saved_attr);
404 } else {
405 sport->port_state = IB_PORT_DOWN;
406 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
407 "is inactive");
408 }
409 break;
410 case 0x31:
411 /* port configuration change
412 * disruptive change is caused by
413 * LID, PKEY or SM change
414 */
415 if (EHCA_BMASK_GET(NEQE_DISRUPTIVE, eqe)) {
416 ehca_warn(&shca->ib_device, "disruptive port "
417 "%d configuration change", port);
418
419 sport->port_state = IB_PORT_DOWN;
420 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
421 "is inactive");
422
423 sport->port_state = IB_PORT_ACTIVE;
424 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
425 "is active");
426 ehca_query_sma_attr(shca, port,
427 &sport->saved_attr);
428 } else
429 notify_port_conf_change(shca, port);
430 break;
431 case 0x32: /* adapter malfunction */
432 ehca_err(&shca->ib_device, "Adapter malfunction.");
433 break;
434 case 0x33: /* trace stopped */
435 ehca_err(&shca->ib_device, "Traced stopped.");
436 break;
437 case 0x34: /* util async event */
438 spec_event = EHCA_BMASK_GET(NEQE_SPECIFIC_EVENT, eqe);
439 if (spec_event == 0x80) /* client reregister required */
440 dispatch_port_event(shca, port,
441 IB_EVENT_CLIENT_REREGISTER,
442 "client reregister req.");
443 else
444 ehca_warn(&shca->ib_device, "Unknown util async "
445 "event %x on port %x", spec_event, port);
446 break;
447 default:
448 ehca_err(&shca->ib_device, "Unknown event code: %x on %s.",
449 ec, shca->ib_device.name);
450 break;
451 }
452
453 return;
454 }
455
reset_eq_pending(struct ehca_cq * cq)456 static inline void reset_eq_pending(struct ehca_cq *cq)
457 {
458 u64 CQx_EP;
459 struct h_galpa gal = cq->galpas.kernel;
460
461 hipz_galpa_store_cq(gal, cqx_ep, 0x0);
462 CQx_EP = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_ep));
463
464 return;
465 }
466
ehca_interrupt_neq(int irq,void * dev_id)467 irqreturn_t ehca_interrupt_neq(int irq, void *dev_id)
468 {
469 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
470
471 tasklet_hi_schedule(&shca->neq.interrupt_task);
472
473 return IRQ_HANDLED;
474 }
475
ehca_tasklet_neq(unsigned long data)476 void ehca_tasklet_neq(unsigned long data)
477 {
478 struct ehca_shca *shca = (struct ehca_shca*)data;
479 struct ehca_eqe *eqe;
480 u64 ret;
481
482 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
483
484 while (eqe) {
485 if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry))
486 parse_ec(shca, eqe->entry);
487
488 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
489 }
490
491 ret = hipz_h_reset_event(shca->ipz_hca_handle,
492 shca->neq.ipz_eq_handle, 0xFFFFFFFFFFFFFFFFL);
493
494 if (ret != H_SUCCESS)
495 ehca_err(&shca->ib_device, "Can't clear notification events.");
496
497 return;
498 }
499
ehca_interrupt_eq(int irq,void * dev_id)500 irqreturn_t ehca_interrupt_eq(int irq, void *dev_id)
501 {
502 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
503
504 tasklet_hi_schedule(&shca->eq.interrupt_task);
505
506 return IRQ_HANDLED;
507 }
508
509
process_eqe(struct ehca_shca * shca,struct ehca_eqe * eqe)510 static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe)
511 {
512 u64 eqe_value;
513 u32 token;
514 struct ehca_cq *cq;
515
516 eqe_value = eqe->entry;
517 ehca_dbg(&shca->ib_device, "eqe_value=%llx", eqe_value);
518 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
519 ehca_dbg(&shca->ib_device, "Got completion event");
520 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
521 read_lock(&ehca_cq_idr_lock);
522 cq = idr_find(&ehca_cq_idr, token);
523 if (cq)
524 atomic_inc(&cq->nr_events);
525 read_unlock(&ehca_cq_idr_lock);
526 if (cq == NULL) {
527 ehca_err(&shca->ib_device,
528 "Invalid eqe for non-existing cq token=%x",
529 token);
530 return;
531 }
532 reset_eq_pending(cq);
533 if (ehca_scaling_code)
534 queue_comp_task(cq);
535 else {
536 comp_event_callback(cq);
537 if (atomic_dec_and_test(&cq->nr_events))
538 wake_up(&cq->wait_completion);
539 }
540 } else {
541 ehca_dbg(&shca->ib_device, "Got non completion event");
542 parse_identifier(shca, eqe_value);
543 }
544 }
545
ehca_process_eq(struct ehca_shca * shca,int is_irq)546 void ehca_process_eq(struct ehca_shca *shca, int is_irq)
547 {
548 struct ehca_eq *eq = &shca->eq;
549 struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
550 u64 eqe_value, ret;
551 unsigned long flags;
552 int eqe_cnt, i;
553 int eq_empty = 0;
554
555 spin_lock_irqsave(&eq->irq_spinlock, flags);
556 if (is_irq) {
557 const int max_query_cnt = 100;
558 int query_cnt = 0;
559 int int_state = 1;
560 do {
561 int_state = hipz_h_query_int_state(
562 shca->ipz_hca_handle, eq->ist);
563 query_cnt++;
564 iosync();
565 } while (int_state && query_cnt < max_query_cnt);
566 if (unlikely((query_cnt == max_query_cnt)))
567 ehca_dbg(&shca->ib_device, "int_state=%x query_cnt=%x",
568 int_state, query_cnt);
569 }
570
571 /* read out all eqes */
572 eqe_cnt = 0;
573 do {
574 u32 token;
575 eqe_cache[eqe_cnt].eqe =
576 (struct ehca_eqe *)ehca_poll_eq(shca, eq);
577 if (!eqe_cache[eqe_cnt].eqe)
578 break;
579 eqe_value = eqe_cache[eqe_cnt].eqe->entry;
580 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
581 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
582 read_lock(&ehca_cq_idr_lock);
583 eqe_cache[eqe_cnt].cq = idr_find(&ehca_cq_idr, token);
584 if (eqe_cache[eqe_cnt].cq)
585 atomic_inc(&eqe_cache[eqe_cnt].cq->nr_events);
586 read_unlock(&ehca_cq_idr_lock);
587 if (!eqe_cache[eqe_cnt].cq) {
588 ehca_err(&shca->ib_device,
589 "Invalid eqe for non-existing cq "
590 "token=%x", token);
591 continue;
592 }
593 } else
594 eqe_cache[eqe_cnt].cq = NULL;
595 eqe_cnt++;
596 } while (eqe_cnt < EHCA_EQE_CACHE_SIZE);
597 if (!eqe_cnt) {
598 if (is_irq)
599 ehca_dbg(&shca->ib_device,
600 "No eqe found for irq event");
601 goto unlock_irq_spinlock;
602 } else if (!is_irq) {
603 ret = hipz_h_eoi(eq->ist);
604 if (ret != H_SUCCESS)
605 ehca_err(&shca->ib_device,
606 "bad return code EOI -rc = %lld\n", ret);
607 ehca_dbg(&shca->ib_device, "deadman found %x eqe", eqe_cnt);
608 }
609 if (unlikely(eqe_cnt == EHCA_EQE_CACHE_SIZE))
610 ehca_dbg(&shca->ib_device, "too many eqes for one irq event");
611 /* enable irq for new packets */
612 for (i = 0; i < eqe_cnt; i++) {
613 if (eq->eqe_cache[i].cq)
614 reset_eq_pending(eq->eqe_cache[i].cq);
615 }
616 /* check eq */
617 spin_lock(&eq->spinlock);
618 eq_empty = (!ipz_eqit_eq_peek_valid(&shca->eq.ipz_queue));
619 spin_unlock(&eq->spinlock);
620 /* call completion handler for cached eqes */
621 for (i = 0; i < eqe_cnt; i++)
622 if (eq->eqe_cache[i].cq) {
623 if (ehca_scaling_code)
624 queue_comp_task(eq->eqe_cache[i].cq);
625 else {
626 struct ehca_cq *cq = eq->eqe_cache[i].cq;
627 comp_event_callback(cq);
628 if (atomic_dec_and_test(&cq->nr_events))
629 wake_up(&cq->wait_completion);
630 }
631 } else {
632 ehca_dbg(&shca->ib_device, "Got non completion event");
633 parse_identifier(shca, eq->eqe_cache[i].eqe->entry);
634 }
635 /* poll eq if not empty */
636 if (eq_empty)
637 goto unlock_irq_spinlock;
638 do {
639 struct ehca_eqe *eqe;
640 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
641 if (!eqe)
642 break;
643 process_eqe(shca, eqe);
644 } while (1);
645
646 unlock_irq_spinlock:
647 spin_unlock_irqrestore(&eq->irq_spinlock, flags);
648 }
649
ehca_tasklet_eq(unsigned long data)650 void ehca_tasklet_eq(unsigned long data)
651 {
652 ehca_process_eq((struct ehca_shca*)data, 1);
653 }
654
find_next_online_cpu(struct ehca_comp_pool * pool)655 static inline int find_next_online_cpu(struct ehca_comp_pool *pool)
656 {
657 int cpu;
658 unsigned long flags;
659
660 WARN_ON_ONCE(!in_interrupt());
661 if (ehca_debug_level >= 3)
662 ehca_dmp(cpu_online_mask, cpumask_size(), "");
663
664 spin_lock_irqsave(&pool->last_cpu_lock, flags);
665 cpu = cpumask_next(pool->last_cpu, cpu_online_mask);
666 if (cpu >= nr_cpu_ids)
667 cpu = cpumask_first(cpu_online_mask);
668 pool->last_cpu = cpu;
669 spin_unlock_irqrestore(&pool->last_cpu_lock, flags);
670
671 return cpu;
672 }
673
__queue_comp_task(struct ehca_cq * __cq,struct ehca_cpu_comp_task * cct)674 static void __queue_comp_task(struct ehca_cq *__cq,
675 struct ehca_cpu_comp_task *cct)
676 {
677 unsigned long flags;
678
679 spin_lock_irqsave(&cct->task_lock, flags);
680 spin_lock(&__cq->task_lock);
681
682 if (__cq->nr_callbacks == 0) {
683 __cq->nr_callbacks++;
684 list_add_tail(&__cq->entry, &cct->cq_list);
685 cct->cq_jobs++;
686 wake_up(&cct->wait_queue);
687 } else
688 __cq->nr_callbacks++;
689
690 spin_unlock(&__cq->task_lock);
691 spin_unlock_irqrestore(&cct->task_lock, flags);
692 }
693
queue_comp_task(struct ehca_cq * __cq)694 static void queue_comp_task(struct ehca_cq *__cq)
695 {
696 int cpu_id;
697 struct ehca_cpu_comp_task *cct;
698 int cq_jobs;
699 unsigned long flags;
700
701 cpu_id = find_next_online_cpu(pool);
702 BUG_ON(!cpu_online(cpu_id));
703
704 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
705 BUG_ON(!cct);
706
707 spin_lock_irqsave(&cct->task_lock, flags);
708 cq_jobs = cct->cq_jobs;
709 spin_unlock_irqrestore(&cct->task_lock, flags);
710 if (cq_jobs > 0) {
711 cpu_id = find_next_online_cpu(pool);
712 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
713 BUG_ON(!cct);
714 }
715
716 __queue_comp_task(__cq, cct);
717 }
718
run_comp_task(struct ehca_cpu_comp_task * cct)719 static void run_comp_task(struct ehca_cpu_comp_task *cct)
720 {
721 struct ehca_cq *cq;
722 unsigned long flags;
723
724 spin_lock_irqsave(&cct->task_lock, flags);
725
726 while (!list_empty(&cct->cq_list)) {
727 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
728 spin_unlock_irqrestore(&cct->task_lock, flags);
729
730 comp_event_callback(cq);
731 if (atomic_dec_and_test(&cq->nr_events))
732 wake_up(&cq->wait_completion);
733
734 spin_lock_irqsave(&cct->task_lock, flags);
735 spin_lock(&cq->task_lock);
736 cq->nr_callbacks--;
737 if (!cq->nr_callbacks) {
738 list_del_init(cct->cq_list.next);
739 cct->cq_jobs--;
740 }
741 spin_unlock(&cq->task_lock);
742 }
743
744 spin_unlock_irqrestore(&cct->task_lock, flags);
745 }
746
comp_task(void * __cct)747 static int comp_task(void *__cct)
748 {
749 struct ehca_cpu_comp_task *cct = __cct;
750 int cql_empty;
751 DECLARE_WAITQUEUE(wait, current);
752
753 set_current_state(TASK_INTERRUPTIBLE);
754 while (!kthread_should_stop()) {
755 add_wait_queue(&cct->wait_queue, &wait);
756
757 spin_lock_irq(&cct->task_lock);
758 cql_empty = list_empty(&cct->cq_list);
759 spin_unlock_irq(&cct->task_lock);
760 if (cql_empty)
761 schedule();
762 else
763 __set_current_state(TASK_RUNNING);
764
765 remove_wait_queue(&cct->wait_queue, &wait);
766
767 spin_lock_irq(&cct->task_lock);
768 cql_empty = list_empty(&cct->cq_list);
769 spin_unlock_irq(&cct->task_lock);
770 if (!cql_empty)
771 run_comp_task(__cct);
772
773 set_current_state(TASK_INTERRUPTIBLE);
774 }
775 __set_current_state(TASK_RUNNING);
776
777 return 0;
778 }
779
create_comp_task(struct ehca_comp_pool * pool,int cpu)780 static struct task_struct *create_comp_task(struct ehca_comp_pool *pool,
781 int cpu)
782 {
783 struct ehca_cpu_comp_task *cct;
784
785 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
786 spin_lock_init(&cct->task_lock);
787 INIT_LIST_HEAD(&cct->cq_list);
788 init_waitqueue_head(&cct->wait_queue);
789 cct->task = kthread_create(comp_task, cct, "ehca_comp/%d", cpu);
790
791 return cct->task;
792 }
793
destroy_comp_task(struct ehca_comp_pool * pool,int cpu)794 static void destroy_comp_task(struct ehca_comp_pool *pool,
795 int cpu)
796 {
797 struct ehca_cpu_comp_task *cct;
798 struct task_struct *task;
799 unsigned long flags_cct;
800
801 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
802
803 spin_lock_irqsave(&cct->task_lock, flags_cct);
804
805 task = cct->task;
806 cct->task = NULL;
807 cct->cq_jobs = 0;
808
809 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
810
811 if (task)
812 kthread_stop(task);
813 }
814
take_over_work(struct ehca_comp_pool * pool,int cpu)815 static void __cpuinit take_over_work(struct ehca_comp_pool *pool, int cpu)
816 {
817 struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
818 LIST_HEAD(list);
819 struct ehca_cq *cq;
820 unsigned long flags_cct;
821
822 spin_lock_irqsave(&cct->task_lock, flags_cct);
823
824 list_splice_init(&cct->cq_list, &list);
825
826 while (!list_empty(&list)) {
827 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
828
829 list_del(&cq->entry);
830 __queue_comp_task(cq, per_cpu_ptr(pool->cpu_comp_tasks,
831 smp_processor_id()));
832 }
833
834 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
835
836 }
837
comp_pool_callback(struct notifier_block * nfb,unsigned long action,void * hcpu)838 static int __cpuinit comp_pool_callback(struct notifier_block *nfb,
839 unsigned long action,
840 void *hcpu)
841 {
842 unsigned int cpu = (unsigned long)hcpu;
843 struct ehca_cpu_comp_task *cct;
844
845 switch (action) {
846 case CPU_UP_PREPARE:
847 case CPU_UP_PREPARE_FROZEN:
848 ehca_gen_dbg("CPU: %x (CPU_PREPARE)", cpu);
849 if (!create_comp_task(pool, cpu)) {
850 ehca_gen_err("Can't create comp_task for cpu: %x", cpu);
851 return NOTIFY_BAD;
852 }
853 break;
854 case CPU_UP_CANCELED:
855 case CPU_UP_CANCELED_FROZEN:
856 ehca_gen_dbg("CPU: %x (CPU_CANCELED)", cpu);
857 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
858 kthread_bind(cct->task, cpumask_any(cpu_online_mask));
859 destroy_comp_task(pool, cpu);
860 break;
861 case CPU_ONLINE:
862 case CPU_ONLINE_FROZEN:
863 ehca_gen_dbg("CPU: %x (CPU_ONLINE)", cpu);
864 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
865 kthread_bind(cct->task, cpu);
866 wake_up_process(cct->task);
867 break;
868 case CPU_DOWN_PREPARE:
869 case CPU_DOWN_PREPARE_FROZEN:
870 ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
871 break;
872 case CPU_DOWN_FAILED:
873 case CPU_DOWN_FAILED_FROZEN:
874 ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
875 break;
876 case CPU_DEAD:
877 case CPU_DEAD_FROZEN:
878 ehca_gen_dbg("CPU: %x (CPU_DEAD)", cpu);
879 destroy_comp_task(pool, cpu);
880 take_over_work(pool, cpu);
881 break;
882 }
883
884 return NOTIFY_OK;
885 }
886
887 static struct notifier_block comp_pool_callback_nb __cpuinitdata = {
888 .notifier_call = comp_pool_callback,
889 .priority = 0,
890 };
891
ehca_create_comp_pool(void)892 int ehca_create_comp_pool(void)
893 {
894 int cpu;
895 struct task_struct *task;
896
897 if (!ehca_scaling_code)
898 return 0;
899
900 pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
901 if (pool == NULL)
902 return -ENOMEM;
903
904 spin_lock_init(&pool->last_cpu_lock);
905 pool->last_cpu = cpumask_any(cpu_online_mask);
906
907 pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task);
908 if (pool->cpu_comp_tasks == NULL) {
909 kfree(pool);
910 return -EINVAL;
911 }
912
913 for_each_online_cpu(cpu) {
914 task = create_comp_task(pool, cpu);
915 if (task) {
916 kthread_bind(task, cpu);
917 wake_up_process(task);
918 }
919 }
920
921 register_hotcpu_notifier(&comp_pool_callback_nb);
922
923 printk(KERN_INFO "eHCA scaling code enabled\n");
924
925 return 0;
926 }
927
ehca_destroy_comp_pool(void)928 void ehca_destroy_comp_pool(void)
929 {
930 int i;
931
932 if (!ehca_scaling_code)
933 return;
934
935 unregister_hotcpu_notifier(&comp_pool_callback_nb);
936
937 for_each_online_cpu(i)
938 destroy_comp_task(pool, i);
939
940 free_percpu(pool->cpu_comp_tasks);
941 kfree(pool);
942 }
943