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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
72static void queue_comp_task(struct ehca_cq *__cq);
73
74static struct ehca_comp_pool *pool;
75
76static 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
88static 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:
96 {
97 struct ehca_qp *qp = (struct ehca_qp *)data;
98
99
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:
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
134int 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
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
173error_data1:
174 return ret;
175
176}
177
178static 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
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
205static 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
228
229
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
239static 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
262static 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:
268 qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG, 0);
269 break;
270 case 0x03:
271 qp_event_callback(shca, eqe, IB_EVENT_COMM_EST, 0);
272 break;
273 case 0x04:
274 qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED, 0);
275 break;
276 case 0x05:
277 case 0x06:
278 qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL, 1);
279 break;
280 case 0x07:
281 case 0x08:
282 cq_event_callback(shca, eqe);
283 break;
284 case 0x09:
285 ehca_err(&shca->ib_device, "MRMWPTE error.");
286 break;
287 case 0x0A:
288 ehca_err(&shca->ib_device, "Port event.");
289 break;
290 case 0x0B:
291 ehca_err(&shca->ib_device, "MR access error.");
292 break;
293 case 0x0C:
294 ehca_err(&shca->ib_device, "EQ error.");
295 break;
296 case 0x0D:
297 ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
298 break;
299 case 0x10:
300 ehca_err(&shca->ib_device, "Sampling complete.");
301 break;
302 case 0x11:
303 ehca_err(&shca->ib_device, "Unaffiliated access error.");
304 break;
305 case 0x12:
306 ehca_err(&shca->ib_device, "Path migrating.");
307 break;
308 case 0x13:
309 ehca_err(&shca->ib_device, "Interface trace stopped.");
310 break;
311 case 0x14:
312 ehca_info(&shca->ib_device, "First error capture available");
313 break;
314 case 0x15:
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
326static 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
338static 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
365static 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
384static 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:
393 if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
394
395
396
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
414
415
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:
434 ehca_err(&shca->ib_device, "Adapter malfunction.");
435 break;
436 case 0x33:
437 ehca_err(&shca->ib_device, "Traced stopped.");
438 break;
439 case 0x34:
440 spec_event = EHCA_BMASK_GET(NEQE_SPECIFIC_EVENT, eqe);
441 if (spec_event == 0x80)
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
458static 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
469irqreturn_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
478void 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
502irqreturn_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
512static 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
548void 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
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
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
617 spin_lock(&eq->spinlock);
618 eq_empty = (!ipz_eqit_eq_peek_valid(&shca->eq.ipz_queue));
619 spin_unlock(&eq->spinlock);
620
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
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
646unlock_irq_spinlock:
647 spin_unlock(&eq->irq_spinlock);
648}
649
650void ehca_tasklet_eq(unsigned long data)
651{
652 ehca_process_eq((struct ehca_shca*)data, 1);
653}
654
655static 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
674static 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
694static 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
719static 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
747static 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
780static 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
794static 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
815static 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, this_cpu_ptr(pool->cpu_comp_tasks));
831 }
832
833 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
834
835}
836
837static int __cpuinit comp_pool_callback(struct notifier_block *nfb,
838 unsigned long action,
839 void *hcpu)
840{
841 unsigned int cpu = (unsigned long)hcpu;
842 struct ehca_cpu_comp_task *cct;
843
844 switch (action) {
845 case CPU_UP_PREPARE:
846 case CPU_UP_PREPARE_FROZEN:
847 ehca_gen_dbg("CPU: %x (CPU_PREPARE)", cpu);
848 if (!create_comp_task(pool, cpu)) {
849 ehca_gen_err("Can't create comp_task for cpu: %x", cpu);
850 return notifier_from_errno(-ENOMEM);
851 }
852 break;
853 case CPU_UP_CANCELED:
854 case CPU_UP_CANCELED_FROZEN:
855 ehca_gen_dbg("CPU: %x (CPU_CANCELED)", cpu);
856 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
857 kthread_bind(cct->task, cpumask_any(cpu_online_mask));
858 destroy_comp_task(pool, cpu);
859 break;
860 case CPU_ONLINE:
861 case CPU_ONLINE_FROZEN:
862 ehca_gen_dbg("CPU: %x (CPU_ONLINE)", cpu);
863 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
864 kthread_bind(cct->task, cpu);
865 wake_up_process(cct->task);
866 break;
867 case CPU_DOWN_PREPARE:
868 case CPU_DOWN_PREPARE_FROZEN:
869 ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
870 break;
871 case CPU_DOWN_FAILED:
872 case CPU_DOWN_FAILED_FROZEN:
873 ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
874 break;
875 case CPU_DEAD:
876 case CPU_DEAD_FROZEN:
877 ehca_gen_dbg("CPU: %x (CPU_DEAD)", cpu);
878 destroy_comp_task(pool, cpu);
879 take_over_work(pool, cpu);
880 break;
881 }
882
883 return NOTIFY_OK;
884}
885
886static struct notifier_block comp_pool_callback_nb __cpuinitdata = {
887 .notifier_call = comp_pool_callback,
888 .priority = 0,
889};
890
891int ehca_create_comp_pool(void)
892{
893 int cpu;
894 struct task_struct *task;
895
896 if (!ehca_scaling_code)
897 return 0;
898
899 pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
900 if (pool == NULL)
901 return -ENOMEM;
902
903 spin_lock_init(&pool->last_cpu_lock);
904 pool->last_cpu = cpumask_any(cpu_online_mask);
905
906 pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task);
907 if (pool->cpu_comp_tasks == NULL) {
908 kfree(pool);
909 return -EINVAL;
910 }
911
912 for_each_online_cpu(cpu) {
913 task = create_comp_task(pool, cpu);
914 if (task) {
915 kthread_bind(task, cpu);
916 wake_up_process(task);
917 }
918 }
919
920 register_hotcpu_notifier(&comp_pool_callback_nb);
921
922 printk(KERN_INFO "eHCA scaling code enabled\n");
923
924 return 0;
925}
926
927void ehca_destroy_comp_pool(void)
928{
929 int i;
930
931 if (!ehca_scaling_code)
932 return;
933
934 unregister_hotcpu_notifier(&comp_pool_callback_nb);
935
936 for_each_online_cpu(i)
937 destroy_comp_task(pool, i);
938
939 free_percpu(pool->cpu_comp_tasks);
940 kfree(pool);
941}
942
