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 <linux/slab.h>
45
46 #include "ehca_classes.h"
47 #include "ehca_irq.h"
48 #include "ehca_iverbs.h"
49 #include "ehca_tools.h"
50 #include "hcp_if.h"
51 #include "hipz_fns.h"
52 #include "ipz_pt_fn.h"
53
54 #define EQE_COMPLETION_EVENT EHCA_BMASK_IBM( 1, 1)
55 #define EQE_CQ_QP_NUMBER EHCA_BMASK_IBM( 8, 31)
56 #define EQE_EE_IDENTIFIER EHCA_BMASK_IBM( 2, 7)
57 #define EQE_CQ_NUMBER EHCA_BMASK_IBM( 8, 31)
58 #define EQE_QP_NUMBER EHCA_BMASK_IBM( 8, 31)
59 #define EQE_QP_TOKEN EHCA_BMASK_IBM(32, 63)
60 #define EQE_CQ_TOKEN EHCA_BMASK_IBM(32, 63)
61
62 #define NEQE_COMPLETION_EVENT EHCA_BMASK_IBM( 1, 1)
63 #define NEQE_EVENT_CODE EHCA_BMASK_IBM( 2, 7)
64 #define NEQE_PORT_NUMBER EHCA_BMASK_IBM( 8, 15)
65 #define NEQE_PORT_AVAILABILITY EHCA_BMASK_IBM(16, 16)
66 #define NEQE_DISRUPTIVE EHCA_BMASK_IBM(16, 16)
67 #define NEQE_SPECIFIC_EVENT EHCA_BMASK_IBM(16, 23)
68
69 #define ERROR_DATA_LENGTH EHCA_BMASK_IBM(52, 63)
70 #define ERROR_DATA_TYPE EHCA_BMASK_IBM( 0, 7)
71
72 static void queue_comp_task(struct ehca_cq *__cq);
73
74 static struct ehca_comp_pool *pool;
75
comp_event_callback(struct ehca_cq * cq)76 static inline void comp_event_callback(struct ehca_cq *cq)
77 {
78 if (!cq->ib_cq.comp_handler)
79 return;
80
81 spin_lock(&cq->cb_lock);
82 cq->ib_cq.comp_handler(&cq->ib_cq, cq->ib_cq.cq_context);
83 spin_unlock(&cq->cb_lock);
84
85 return;
86 }
87
print_error_data(struct ehca_shca * shca,void * data,u64 * rblock,int length)88 static void print_error_data(struct ehca_shca *shca, void *data,
89 u64 *rblock, int length)
90 {
91 u64 type = EHCA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
92 u64 resource = rblock[1];
93
94 switch (type) {
95 case 0x1: /* Queue Pair */
96 {
97 struct ehca_qp *qp = (struct ehca_qp *)data;
98
99 /* only print error data if AER is set */
100 if (rblock[6] == 0)
101 return;
102
103 ehca_err(&shca->ib_device,
104 "QP 0x%x (resource=%llx) has errors.",
105 qp->ib_qp.qp_num, resource);
106 break;
107 }
108 case 0x4: /* Completion Queue */
109 {
110 struct ehca_cq *cq = (struct ehca_cq *)data;
111
112 ehca_err(&shca->ib_device,
113 "CQ 0x%x (resource=%llx) has errors.",
114 cq->cq_number, resource);
115 break;
116 }
117 default:
118 ehca_err(&shca->ib_device,
119 "Unknown error type: %llx on %s.",
120 type, shca->ib_device.name);
121 break;
122 }
123
124 ehca_err(&shca->ib_device, "Error data is available: %llx.", resource);
125 ehca_err(&shca->ib_device, "EHCA ----- error data begin "
126 "---------------------------------------------------");
127 ehca_dmp(rblock, length, "resource=%llx", resource);
128 ehca_err(&shca->ib_device, "EHCA ----- error data end "
129 "----------------------------------------------------");
130
131 return;
132 }
133
ehca_error_data(struct ehca_shca * shca,void * data,u64 resource)134 int ehca_error_data(struct ehca_shca *shca, void *data,
135 u64 resource)
136 {
137
138 unsigned long ret;
139 u64 *rblock;
140 unsigned long block_count;
141
142 rblock = ehca_alloc_fw_ctrlblock(GFP_ATOMIC);
143 if (!rblock) {
144 ehca_err(&shca->ib_device, "Cannot allocate rblock memory.");
145 ret = -ENOMEM;
146 goto error_data1;
147 }
148
149 /* rblock must be 4K aligned and should be 4K large */
150 ret = hipz_h_error_data(shca->ipz_hca_handle,
151 resource,
152 rblock,
153 &block_count);
154
155 if (ret == H_R_STATE)
156 ehca_err(&shca->ib_device,
157 "No error data is available: %llx.", resource);
158 else if (ret == H_SUCCESS) {
159 int length;
160
161 length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]);
162
163 if (length > EHCA_PAGESIZE)
164 length = EHCA_PAGESIZE;
165
166 print_error_data(shca, data, rblock, length);
167 } else
168 ehca_err(&shca->ib_device,
169 "Error data could not be fetched: %llx", resource);
170
171 ehca_free_fw_ctrlblock(rblock);
172
173 error_data1:
174 return ret;
175
176 }
177
dispatch_qp_event(struct ehca_shca * shca,struct ehca_qp * qp,enum ib_event_type event_type)178 static void dispatch_qp_event(struct ehca_shca *shca, struct ehca_qp *qp,
179 enum ib_event_type event_type)
180 {
181 struct ib_event event;
182
183 /* PATH_MIG without the QP ever having been armed is false alarm */
184 if (event_type == IB_EVENT_PATH_MIG && !qp->mig_armed)
185 return;
186
187 event.device = &shca->ib_device;
188 event.event = event_type;
189
190 if (qp->ext_type == EQPT_SRQ) {
191 if (!qp->ib_srq.event_handler)
192 return;
193
194 event.element.srq = &qp->ib_srq;
195 qp->ib_srq.event_handler(&event, qp->ib_srq.srq_context);
196 } else {
197 if (!qp->ib_qp.event_handler)
198 return;
199
200 event.element.qp = &qp->ib_qp;
201 qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context);
202 }
203 }
204
qp_event_callback(struct ehca_shca * shca,u64 eqe,enum ib_event_type event_type,int fatal)205 static void qp_event_callback(struct ehca_shca *shca, u64 eqe,
206 enum ib_event_type event_type, int fatal)
207 {
208 struct ehca_qp *qp;
209 u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
210
211 read_lock(&ehca_qp_idr_lock);
212 qp = idr_find(&ehca_qp_idr, token);
213 if (qp)
214 atomic_inc(&qp->nr_events);
215 read_unlock(&ehca_qp_idr_lock);
216
217 if (!qp)
218 return;
219
220 if (fatal)
221 ehca_error_data(shca, qp, qp->ipz_qp_handle.handle);
222
223 dispatch_qp_event(shca, qp, fatal && qp->ext_type == EQPT_SRQ ?
224 IB_EVENT_SRQ_ERR : event_type);
225
226 /*
227 * eHCA only processes one WQE at a time for SRQ base QPs,
228 * so the last WQE has been processed as soon as the QP enters
229 * error state.
230 */
231 if (fatal && qp->ext_type == EQPT_SRQBASE)
232 dispatch_qp_event(shca, qp, IB_EVENT_QP_LAST_WQE_REACHED);
233
234 if (atomic_dec_and_test(&qp->nr_events))
235 wake_up(&qp->wait_completion);
236 return;
237 }
238
cq_event_callback(struct ehca_shca * shca,u64 eqe)239 static void cq_event_callback(struct ehca_shca *shca,
240 u64 eqe)
241 {
242 struct ehca_cq *cq;
243 u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
244
245 read_lock(&ehca_cq_idr_lock);
246 cq = idr_find(&ehca_cq_idr, token);
247 if (cq)
248 atomic_inc(&cq->nr_events);
249 read_unlock(&ehca_cq_idr_lock);
250
251 if (!cq)
252 return;
253
254 ehca_error_data(shca, cq, cq->ipz_cq_handle.handle);
255
256 if (atomic_dec_and_test(&cq->nr_events))
257 wake_up(&cq->wait_completion);
258
259 return;
260 }
261
parse_identifier(struct ehca_shca * shca,u64 eqe)262 static void parse_identifier(struct ehca_shca *shca, u64 eqe)
263 {
264 u8 identifier = EHCA_BMASK_GET(EQE_EE_IDENTIFIER, eqe);
265
266 switch (identifier) {
267 case 0x02: /* path migrated */
268 qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG, 0);
269 break;
270 case 0x03: /* communication established */
271 qp_event_callback(shca, eqe, IB_EVENT_COMM_EST, 0);
272 break;
273 case 0x04: /* send queue drained */
274 qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED, 0);
275 break;
276 case 0x05: /* QP error */
277 case 0x06: /* QP error */
278 qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL, 1);
279 break;
280 case 0x07: /* CQ error */
281 case 0x08: /* CQ error */
282 cq_event_callback(shca, eqe);
283 break;
284 case 0x09: /* MRMWPTE error */
285 ehca_err(&shca->ib_device, "MRMWPTE error.");
286 break;
287 case 0x0A: /* port event */
288 ehca_err(&shca->ib_device, "Port event.");
289 break;
290 case 0x0B: /* MR access error */
291 ehca_err(&shca->ib_device, "MR access error.");
292 break;
293 case 0x0C: /* EQ error */
294 ehca_err(&shca->ib_device, "EQ error.");
295 break;
296 case 0x0D: /* P/Q_Key mismatch */
297 ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
298 break;
299 case 0x10: /* sampling complete */
300 ehca_err(&shca->ib_device, "Sampling complete.");
301 break;
302 case 0x11: /* unaffiliated access error */
303 ehca_err(&shca->ib_device, "Unaffiliated access error.");
304 break;
305 case 0x12: /* path migrating */
306 ehca_err(&shca->ib_device, "Path migrating.");
307 break;
308 case 0x13: /* interface trace stopped */
309 ehca_err(&shca->ib_device, "Interface trace stopped.");
310 break;
311 case 0x14: /* first error capture info available */
312 ehca_info(&shca->ib_device, "First error capture available");
313 break;
314 case 0x15: /* SRQ limit reached */
315 qp_event_callback(shca, eqe, IB_EVENT_SRQ_LIMIT_REACHED, 0);
316 break;
317 default:
318 ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.",
319 identifier, shca->ib_device.name);
320 break;
321 }
322
323 return;
324 }
325
dispatch_port_event(struct ehca_shca * shca,int port_num,enum ib_event_type type,const char * msg)326 static void dispatch_port_event(struct ehca_shca *shca, int port_num,
327 enum ib_event_type type, const char *msg)
328 {
329 struct ib_event event;
330
331 ehca_info(&shca->ib_device, "port %d %s.", port_num, msg);
332 event.device = &shca->ib_device;
333 event.event = type;
334 event.element.port_num = port_num;
335 ib_dispatch_event(&event);
336 }
337
notify_port_conf_change(struct ehca_shca * shca,int port_num)338 static void notify_port_conf_change(struct ehca_shca *shca, int port_num)
339 {
340 struct ehca_sma_attr new_attr;
341 struct ehca_sma_attr *old_attr = &shca->sport[port_num - 1].saved_attr;
342
343 ehca_query_sma_attr(shca, port_num, &new_attr);
344
345 if (new_attr.sm_sl != old_attr->sm_sl ||
346 new_attr.sm_lid != old_attr->sm_lid)
347 dispatch_port_event(shca, port_num, IB_EVENT_SM_CHANGE,
348 "SM changed");
349
350 if (new_attr.lid != old_attr->lid ||
351 new_attr.lmc != old_attr->lmc)
352 dispatch_port_event(shca, port_num, IB_EVENT_LID_CHANGE,
353 "LID changed");
354
355 if (new_attr.pkey_tbl_len != old_attr->pkey_tbl_len ||
356 memcmp(new_attr.pkeys, old_attr->pkeys,
357 sizeof(u16) * new_attr.pkey_tbl_len))
358 dispatch_port_event(shca, port_num, IB_EVENT_PKEY_CHANGE,
359 "P_Key changed");
360
361 *old_attr = new_attr;
362 }
363
364 /* replay modify_qp for sqps -- return 0 if all is well, 1 if AQP1 destroyed */
replay_modify_qp(struct ehca_sport * sport)365 static int replay_modify_qp(struct ehca_sport *sport)
366 {
367 int aqp1_destroyed;
368 unsigned long flags;
369
370 spin_lock_irqsave(&sport->mod_sqp_lock, flags);
371
372 aqp1_destroyed = !sport->ibqp_sqp[IB_QPT_GSI];
373
374 if (sport->ibqp_sqp[IB_QPT_SMI])
375 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_SMI]);
376 if (!aqp1_destroyed)
377 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_GSI]);
378
379 spin_unlock_irqrestore(&sport->mod_sqp_lock, flags);
380
381 return aqp1_destroyed;
382 }
383
parse_ec(struct ehca_shca * shca,u64 eqe)384 static void parse_ec(struct ehca_shca *shca, u64 eqe)
385 {
386 u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
387 u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
388 u8 spec_event;
389 struct ehca_sport *sport = &shca->sport[port - 1];
390
391 switch (ec) {
392 case 0x30: /* port availability change */
393 if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
394 /* only replay modify_qp calls in autodetect mode;
395 * if AQP1 was destroyed, the port is already down
396 * again and we can drop the event.
397 */
398 if (ehca_nr_ports < 0)
399 if (replay_modify_qp(sport))
400 break;
401
402 sport->port_state = IB_PORT_ACTIVE;
403 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
404 "is active");
405 ehca_query_sma_attr(shca, port, &sport->saved_attr);
406 } else {
407 sport->port_state = IB_PORT_DOWN;
408 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
409 "is inactive");
410 }
411 break;
412 case 0x31:
413 /* port configuration change
414 * disruptive change is caused by
415 * LID, PKEY or SM change
416 */
417 if (EHCA_BMASK_GET(NEQE_DISRUPTIVE, eqe)) {
418 ehca_warn(&shca->ib_device, "disruptive port "
419 "%d configuration change", port);
420
421 sport->port_state = IB_PORT_DOWN;
422 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
423 "is inactive");
424
425 sport->port_state = IB_PORT_ACTIVE;
426 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
427 "is active");
428 ehca_query_sma_attr(shca, port,
429 &sport->saved_attr);
430 } else
431 notify_port_conf_change(shca, port);
432 break;
433 case 0x32: /* adapter malfunction */
434 ehca_err(&shca->ib_device, "Adapter malfunction.");
435 break;
436 case 0x33: /* trace stopped */
437 ehca_err(&shca->ib_device, "Traced stopped.");
438 break;
439 case 0x34: /* util async event */
440 spec_event = EHCA_BMASK_GET(NEQE_SPECIFIC_EVENT, eqe);
441 if (spec_event == 0x80) /* client reregister required */
442 dispatch_port_event(shca, port,
443 IB_EVENT_CLIENT_REREGISTER,
444 "client reregister req.");
445 else
446 ehca_warn(&shca->ib_device, "Unknown util async "
447 "event %x on port %x", spec_event, port);
448 break;
449 default:
450 ehca_err(&shca->ib_device, "Unknown event code: %x on %s.",
451 ec, shca->ib_device.name);
452 break;
453 }
454
455 return;
456 }
457
reset_eq_pending(struct ehca_cq * cq)458 static inline void reset_eq_pending(struct ehca_cq *cq)
459 {
460 u64 CQx_EP;
461 struct h_galpa gal = cq->galpas.kernel;
462
463 hipz_galpa_store_cq(gal, cqx_ep, 0x0);
464 CQx_EP = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_ep));
465
466 return;
467 }
468
ehca_interrupt_neq(int irq,void * dev_id)469 irqreturn_t ehca_interrupt_neq(int irq, void *dev_id)
470 {
471 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
472
473 tasklet_hi_schedule(&shca->neq.interrupt_task);
474
475 return IRQ_HANDLED;
476 }
477
ehca_tasklet_neq(unsigned long data)478 void ehca_tasklet_neq(unsigned long data)
479 {
480 struct ehca_shca *shca = (struct ehca_shca*)data;
481 struct ehca_eqe *eqe;
482 u64 ret;
483
484 eqe = ehca_poll_eq(shca, &shca->neq);
485
486 while (eqe) {
487 if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry))
488 parse_ec(shca, eqe->entry);
489
490 eqe = ehca_poll_eq(shca, &shca->neq);
491 }
492
493 ret = hipz_h_reset_event(shca->ipz_hca_handle,
494 shca->neq.ipz_eq_handle, 0xFFFFFFFFFFFFFFFFL);
495
496 if (ret != H_SUCCESS)
497 ehca_err(&shca->ib_device, "Can't clear notification events.");
498
499 return;
500 }
501
ehca_interrupt_eq(int irq,void * dev_id)502 irqreturn_t ehca_interrupt_eq(int irq, void *dev_id)
503 {
504 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
505
506 tasklet_hi_schedule(&shca->eq.interrupt_task);
507
508 return IRQ_HANDLED;
509 }
510
511
process_eqe(struct ehca_shca * shca,struct ehca_eqe * eqe)512 static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe)
513 {
514 u64 eqe_value;
515 u32 token;
516 struct ehca_cq *cq;
517
518 eqe_value = eqe->entry;
519 ehca_dbg(&shca->ib_device, "eqe_value=%llx", eqe_value);
520 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
521 ehca_dbg(&shca->ib_device, "Got completion event");
522 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
523 read_lock(&ehca_cq_idr_lock);
524 cq = idr_find(&ehca_cq_idr, token);
525 if (cq)
526 atomic_inc(&cq->nr_events);
527 read_unlock(&ehca_cq_idr_lock);
528 if (cq == NULL) {
529 ehca_err(&shca->ib_device,
530 "Invalid eqe for non-existing cq token=%x",
531 token);
532 return;
533 }
534 reset_eq_pending(cq);
535 if (ehca_scaling_code)
536 queue_comp_task(cq);
537 else {
538 comp_event_callback(cq);
539 if (atomic_dec_and_test(&cq->nr_events))
540 wake_up(&cq->wait_completion);
541 }
542 } else {
543 ehca_dbg(&shca->ib_device, "Got non completion event");
544 parse_identifier(shca, eqe_value);
545 }
546 }
547
ehca_process_eq(struct ehca_shca * shca,int is_irq)548 void ehca_process_eq(struct ehca_shca *shca, int is_irq)
549 {
550 struct ehca_eq *eq = &shca->eq;
551 struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
552 u64 eqe_value, ret;
553 int eqe_cnt, i;
554 int eq_empty = 0;
555
556 spin_lock(&eq->irq_spinlock);
557 if (is_irq) {
558 const int max_query_cnt = 100;
559 int query_cnt = 0;
560 int int_state = 1;
561 do {
562 int_state = hipz_h_query_int_state(
563 shca->ipz_hca_handle, eq->ist);
564 query_cnt++;
565 iosync();
566 } while (int_state && query_cnt < max_query_cnt);
567 if (unlikely((query_cnt == max_query_cnt)))
568 ehca_dbg(&shca->ib_device, "int_state=%x query_cnt=%x",
569 int_state, query_cnt);
570 }
571
572 /* read out all eqes */
573 eqe_cnt = 0;
574 do {
575 u32 token;
576 eqe_cache[eqe_cnt].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 = 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(&eq->irq_spinlock);
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_on_node(comp_task, cct, cpu_to_node(cpu),
790 "ehca_comp/%d", cpu);
791
792 return cct->task;
793 }
794
destroy_comp_task(struct ehca_comp_pool * pool,int cpu)795 static void destroy_comp_task(struct ehca_comp_pool *pool,
796 int cpu)
797 {
798 struct ehca_cpu_comp_task *cct;
799 struct task_struct *task;
800 unsigned long flags_cct;
801
802 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
803
804 spin_lock_irqsave(&cct->task_lock, flags_cct);
805
806 task = cct->task;
807 cct->task = NULL;
808 cct->cq_jobs = 0;
809
810 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
811
812 if (task)
813 kthread_stop(task);
814 }
815
take_over_work(struct ehca_comp_pool * pool,int cpu)816 static void __cpuinit take_over_work(struct ehca_comp_pool *pool, int cpu)
817 {
818 struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
819 LIST_HEAD(list);
820 struct ehca_cq *cq;
821 unsigned long flags_cct;
822
823 spin_lock_irqsave(&cct->task_lock, flags_cct);
824
825 list_splice_init(&cct->cq_list, &list);
826
827 while (!list_empty(&list)) {
828 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
829
830 list_del(&cq->entry);
831 __queue_comp_task(cq, this_cpu_ptr(pool->cpu_comp_tasks));
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 notifier_from_errno(-ENOMEM);
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