2 * IBM eServer eHCA Infiniband device driver for Linux on POWER
4 * Functions for EQs, NEQs and interrupts
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>
11 * Copyright (c) 2005 IBM Corporation
13 * All rights reserved.
15 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions are met:
23 * Redistributions of source code must retain the above copyright notice, this
24 * list of conditions and the following disclaimer.
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.
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.
44 #include <linux/slab.h>
46 #include "ehca_classes.h"
48 #include "ehca_iverbs.h"
49 #include "ehca_tools.h"
52 #include "ipz_pt_fn.h"
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)
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)
69 #define ERROR_DATA_LENGTH EHCA_BMASK_IBM(52, 63)
70 #define ERROR_DATA_TYPE EHCA_BMASK_IBM( 0, 7)
72 static void queue_comp_task(struct ehca_cq *__cq);
74 static struct ehca_comp_pool *pool;
76 static inline void comp_event_callback(struct ehca_cq *cq)
78 if (!cq->ib_cq.comp_handler)
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);
88 static void print_error_data(struct ehca_shca *shca, void *data,
89 u64 *rblock, int length)
91 u64 type = EHCA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
92 u64 resource = rblock[1];
95 case 0x1: /* Queue Pair */
97 struct ehca_qp *qp = (struct ehca_qp *)data;
99 /* only print error data if AER is set */
103 ehca_err(&shca->ib_device,
104 "QP 0x%x (resource=%llx) has errors.",
105 qp->ib_qp.qp_num, resource);
108 case 0x4: /* Completion Queue */
110 struct ehca_cq *cq = (struct ehca_cq *)data;
112 ehca_err(&shca->ib_device,
113 "CQ 0x%x (resource=%llx) has errors.",
114 cq->cq_number, resource);
118 ehca_err(&shca->ib_device,
119 "Unknown error type: %llx on %s.",
120 type, shca->ib_device.name);
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 "----------------------------------------------------");
134 int ehca_error_data(struct ehca_shca *shca, void *data,
140 unsigned long block_count;
142 rblock = ehca_alloc_fw_ctrlblock(GFP_ATOMIC);
144 ehca_err(&shca->ib_device, "Cannot allocate rblock memory.");
149 /* rblock must be 4K aligned and should be 4K large */
150 ret = hipz_h_error_data(shca->ipz_hca_handle,
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) {
161 length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]);
163 if (length > EHCA_PAGESIZE)
164 length = EHCA_PAGESIZE;
166 print_error_data(shca, data, rblock, length);
168 ehca_err(&shca->ib_device,
169 "Error data could not be fetched: %llx", resource);
171 ehca_free_fw_ctrlblock(rblock);
178 static void dispatch_qp_event(struct ehca_shca *shca, struct ehca_qp *qp,
179 enum ib_event_type event_type)
181 struct ib_event event;
183 /* PATH_MIG without the QP ever having been armed is false alarm */
184 if (event_type == IB_EVENT_PATH_MIG && !qp->mig_armed)
187 event.device = &shca->ib_device;
188 event.event = event_type;
190 if (qp->ext_type == EQPT_SRQ) {
191 if (!qp->ib_srq.event_handler)
194 event.element.srq = &qp->ib_srq;
195 qp->ib_srq.event_handler(&event, qp->ib_srq.srq_context);
197 if (!qp->ib_qp.event_handler)
200 event.element.qp = &qp->ib_qp;
201 qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context);
205 static void qp_event_callback(struct ehca_shca *shca, u64 eqe,
206 enum ib_event_type event_type, int fatal)
209 u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
211 read_lock(&ehca_qp_idr_lock);
212 qp = idr_find(&ehca_qp_idr, token);
214 atomic_inc(&qp->nr_events);
215 read_unlock(&ehca_qp_idr_lock);
221 ehca_error_data(shca, qp, qp->ipz_qp_handle.handle);
223 dispatch_qp_event(shca, qp, fatal && qp->ext_type == EQPT_SRQ ?
224 IB_EVENT_SRQ_ERR : event_type);
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
231 if (fatal && qp->ext_type == EQPT_SRQBASE)
232 dispatch_qp_event(shca, qp, IB_EVENT_QP_LAST_WQE_REACHED);
234 if (atomic_dec_and_test(&qp->nr_events))
235 wake_up(&qp->wait_completion);
239 static void cq_event_callback(struct ehca_shca *shca,
243 u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
245 read_lock(&ehca_cq_idr_lock);
246 cq = idr_find(&ehca_cq_idr, token);
248 atomic_inc(&cq->nr_events);
249 read_unlock(&ehca_cq_idr_lock);
254 ehca_error_data(shca, cq, cq->ipz_cq_handle.handle);
256 if (atomic_dec_and_test(&cq->nr_events))
257 wake_up(&cq->wait_completion);
262 static void parse_identifier(struct ehca_shca *shca, u64 eqe)
264 u8 identifier = EHCA_BMASK_GET(EQE_EE_IDENTIFIER, eqe);
266 switch (identifier) {
267 case 0x02: /* path migrated */
268 qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG, 0);
270 case 0x03: /* communication established */
271 qp_event_callback(shca, eqe, IB_EVENT_COMM_EST, 0);
273 case 0x04: /* send queue drained */
274 qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED, 0);
276 case 0x05: /* QP error */
277 case 0x06: /* QP error */
278 qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL, 1);
280 case 0x07: /* CQ error */
281 case 0x08: /* CQ error */
282 cq_event_callback(shca, eqe);
284 case 0x09: /* MRMWPTE error */
285 ehca_err(&shca->ib_device, "MRMWPTE error.");
287 case 0x0A: /* port event */
288 ehca_err(&shca->ib_device, "Port event.");
290 case 0x0B: /* MR access error */
291 ehca_err(&shca->ib_device, "MR access error.");
293 case 0x0C: /* EQ error */
294 ehca_err(&shca->ib_device, "EQ error.");
296 case 0x0D: /* P/Q_Key mismatch */
297 ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
299 case 0x10: /* sampling complete */
300 ehca_err(&shca->ib_device, "Sampling complete.");
302 case 0x11: /* unaffiliated access error */
303 ehca_err(&shca->ib_device, "Unaffiliated access error.");
305 case 0x12: /* path migrating */
306 ehca_err(&shca->ib_device, "Path migrating.");
308 case 0x13: /* interface trace stopped */
309 ehca_err(&shca->ib_device, "Interface trace stopped.");
311 case 0x14: /* first error capture info available */
312 ehca_info(&shca->ib_device, "First error capture available");
314 case 0x15: /* SRQ limit reached */
315 qp_event_callback(shca, eqe, IB_EVENT_SRQ_LIMIT_REACHED, 0);
318 ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.",
319 identifier, shca->ib_device.name);
326 static void dispatch_port_event(struct ehca_shca *shca, int port_num,
327 enum ib_event_type type, const char *msg)
329 struct ib_event event;
331 ehca_info(&shca->ib_device, "port %d %s.", port_num, msg);
332 event.device = &shca->ib_device;
334 event.element.port_num = port_num;
335 ib_dispatch_event(&event);
338 static void notify_port_conf_change(struct ehca_shca *shca, int port_num)
340 struct ehca_sma_attr new_attr;
341 struct ehca_sma_attr *old_attr = &shca->sport[port_num - 1].saved_attr;
343 ehca_query_sma_attr(shca, port_num, &new_attr);
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,
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,
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,
361 *old_attr = new_attr;
364 /* replay modify_qp for sqps -- return 0 if all is well, 1 if AQP1 destroyed */
365 static int replay_modify_qp(struct ehca_sport *sport)
370 spin_lock_irqsave(&sport->mod_sqp_lock, flags);
372 aqp1_destroyed = !sport->ibqp_sqp[IB_QPT_GSI];
374 if (sport->ibqp_sqp[IB_QPT_SMI])
375 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_SMI]);
377 ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_GSI]);
379 spin_unlock_irqrestore(&sport->mod_sqp_lock, flags);
381 return aqp1_destroyed;
384 static void parse_ec(struct ehca_shca *shca, u64 eqe)
386 u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
387 u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
389 struct ehca_sport *sport = &shca->sport[port - 1];
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.
398 if (ehca_nr_ports < 0)
399 if (replay_modify_qp(sport))
402 sport->port_state = IB_PORT_ACTIVE;
403 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
405 ehca_query_sma_attr(shca, port, &sport->saved_attr);
407 sport->port_state = IB_PORT_DOWN;
408 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
413 /* port configuration change
414 * disruptive change is caused by
415 * LID, PKEY or SM change
417 if (EHCA_BMASK_GET(NEQE_DISRUPTIVE, eqe)) {
418 ehca_warn(&shca->ib_device, "disruptive port "
419 "%d configuration change", port);
421 sport->port_state = IB_PORT_DOWN;
422 dispatch_port_event(shca, port, IB_EVENT_PORT_ERR,
425 sport->port_state = IB_PORT_ACTIVE;
426 dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE,
428 ehca_query_sma_attr(shca, port,
431 notify_port_conf_change(shca, port);
433 case 0x32: /* adapter malfunction */
434 ehca_err(&shca->ib_device, "Adapter malfunction.");
436 case 0x33: /* trace stopped */
437 ehca_err(&shca->ib_device, "Traced stopped.");
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.");
446 ehca_warn(&shca->ib_device, "Unknown util async "
447 "event %x on port %x", spec_event, port);
450 ehca_err(&shca->ib_device, "Unknown event code: %x on %s.",
451 ec, shca->ib_device.name);
458 static inline void reset_eq_pending(struct ehca_cq *cq)
461 struct h_galpa gal = cq->galpas.kernel;
463 hipz_galpa_store_cq(gal, cqx_ep, 0x0);
464 CQx_EP = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_ep));
469 irqreturn_t ehca_interrupt_neq(int irq, void *dev_id)
471 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
473 tasklet_hi_schedule(&shca->neq.interrupt_task);
478 void ehca_tasklet_neq(unsigned long data)
480 struct ehca_shca *shca = (struct ehca_shca*)data;
481 struct ehca_eqe *eqe;
484 eqe = ehca_poll_eq(shca, &shca->neq);
487 if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry))
488 parse_ec(shca, eqe->entry);
490 eqe = ehca_poll_eq(shca, &shca->neq);
493 ret = hipz_h_reset_event(shca->ipz_hca_handle,
494 shca->neq.ipz_eq_handle, 0xFFFFFFFFFFFFFFFFL);
496 if (ret != H_SUCCESS)
497 ehca_err(&shca->ib_device, "Can't clear notification events.");
502 irqreturn_t ehca_interrupt_eq(int irq, void *dev_id)
504 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
506 tasklet_hi_schedule(&shca->eq.interrupt_task);
512 static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe)
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);
526 atomic_inc(&cq->nr_events);
527 read_unlock(&ehca_cq_idr_lock);
529 ehca_err(&shca->ib_device,
530 "Invalid eqe for non-existing cq token=%x",
534 reset_eq_pending(cq);
535 if (ehca_scaling_code)
538 comp_event_callback(cq);
539 if (atomic_dec_and_test(&cq->nr_events))
540 wake_up(&cq->wait_completion);
543 ehca_dbg(&shca->ib_device, "Got non completion event");
544 parse_identifier(shca, eqe_value);
548 void ehca_process_eq(struct ehca_shca *shca, int is_irq)
550 struct ehca_eq *eq = &shca->eq;
551 struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
556 spin_lock(&eq->irq_spinlock);
558 const int max_query_cnt = 100;
562 int_state = hipz_h_query_int_state(
563 shca->ipz_hca_handle, eq->ist);
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);
572 /* read out all eqes */
576 eqe_cache[eqe_cnt].eqe = ehca_poll_eq(shca, eq);
577 if (!eqe_cache[eqe_cnt].eqe)
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 "
594 eqe_cache[eqe_cnt].cq = NULL;
596 } while (eqe_cnt < EHCA_EQE_CACHE_SIZE);
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);
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);
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);
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);
632 ehca_dbg(&shca->ib_device, "Got non completion event");
633 parse_identifier(shca, eq->eqe_cache[i].eqe->entry);
635 /* poll eq if not empty */
637 goto unlock_irq_spinlock;
639 struct ehca_eqe *eqe;
640 eqe = ehca_poll_eq(shca, &shca->eq);
643 process_eqe(shca, eqe);
647 spin_unlock(&eq->irq_spinlock);
650 void ehca_tasklet_eq(unsigned long data)
652 ehca_process_eq((struct ehca_shca*)data, 1);
655 static inline int find_next_online_cpu(struct ehca_comp_pool *pool)
660 WARN_ON_ONCE(!in_interrupt());
661 if (ehca_debug_level >= 3)
662 ehca_dmp(cpu_online_mask, cpumask_size(), "");
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);
674 static void __queue_comp_task(struct ehca_cq *__cq,
675 struct ehca_cpu_comp_task *cct)
679 spin_lock_irqsave(&cct->task_lock, flags);
680 spin_lock(&__cq->task_lock);
682 if (__cq->nr_callbacks == 0) {
683 __cq->nr_callbacks++;
684 list_add_tail(&__cq->entry, &cct->cq_list);
686 wake_up(&cct->wait_queue);
688 __cq->nr_callbacks++;
690 spin_unlock(&__cq->task_lock);
691 spin_unlock_irqrestore(&cct->task_lock, flags);
694 static void queue_comp_task(struct ehca_cq *__cq)
697 struct ehca_cpu_comp_task *cct;
701 cpu_id = find_next_online_cpu(pool);
702 BUG_ON(!cpu_online(cpu_id));
704 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
707 spin_lock_irqsave(&cct->task_lock, flags);
708 cq_jobs = cct->cq_jobs;
709 spin_unlock_irqrestore(&cct->task_lock, flags);
711 cpu_id = find_next_online_cpu(pool);
712 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
716 __queue_comp_task(__cq, cct);
719 static void run_comp_task(struct ehca_cpu_comp_task *cct)
724 spin_lock_irqsave(&cct->task_lock, flags);
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);
730 comp_event_callback(cq);
731 if (atomic_dec_and_test(&cq->nr_events))
732 wake_up(&cq->wait_completion);
734 spin_lock_irqsave(&cct->task_lock, flags);
735 spin_lock(&cq->task_lock);
737 if (!cq->nr_callbacks) {
738 list_del_init(cct->cq_list.next);
741 spin_unlock(&cq->task_lock);
744 spin_unlock_irqrestore(&cct->task_lock, flags);
747 static int comp_task(void *__cct)
749 struct ehca_cpu_comp_task *cct = __cct;
751 DECLARE_WAITQUEUE(wait, current);
753 set_current_state(TASK_INTERRUPTIBLE);
754 while (!kthread_should_stop()) {
755 add_wait_queue(&cct->wait_queue, &wait);
757 spin_lock_irq(&cct->task_lock);
758 cql_empty = list_empty(&cct->cq_list);
759 spin_unlock_irq(&cct->task_lock);
763 __set_current_state(TASK_RUNNING);
765 remove_wait_queue(&cct->wait_queue, &wait);
767 spin_lock_irq(&cct->task_lock);
768 cql_empty = list_empty(&cct->cq_list);
769 spin_unlock_irq(&cct->task_lock);
771 run_comp_task(__cct);
773 set_current_state(TASK_INTERRUPTIBLE);
775 __set_current_state(TASK_RUNNING);
780 static struct task_struct *create_comp_task(struct ehca_comp_pool *pool,
783 struct ehca_cpu_comp_task *cct;
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);
794 static void destroy_comp_task(struct ehca_comp_pool *pool,
797 struct ehca_cpu_comp_task *cct;
798 struct task_struct *task;
799 unsigned long flags_cct;
801 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
803 spin_lock_irqsave(&cct->task_lock, flags_cct);
809 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
815 static void __cpuinit take_over_work(struct ehca_comp_pool *pool, int cpu)
817 struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
820 unsigned long flags_cct;
822 spin_lock_irqsave(&cct->task_lock, flags_cct);
824 list_splice_init(&cct->cq_list, &list);
826 while (!list_empty(&list)) {
827 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
829 list_del(&cq->entry);
830 __queue_comp_task(cq, this_cpu_ptr(pool->cpu_comp_tasks));
833 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
837 static int __cpuinit comp_pool_callback(struct notifier_block *nfb,
838 unsigned long action,
841 unsigned int cpu = (unsigned long)hcpu;
842 struct ehca_cpu_comp_task *cct;
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);
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);
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);
867 case CPU_DOWN_PREPARE:
868 case CPU_DOWN_PREPARE_FROZEN:
869 ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
871 case CPU_DOWN_FAILED:
872 case CPU_DOWN_FAILED_FROZEN:
873 ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
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);
886 static struct notifier_block comp_pool_callback_nb __cpuinitdata = {
887 .notifier_call = comp_pool_callback,
891 int ehca_create_comp_pool(void)
894 struct task_struct *task;
896 if (!ehca_scaling_code)
899 pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
903 spin_lock_init(&pool->last_cpu_lock);
904 pool->last_cpu = cpumask_any(cpu_online_mask);
906 pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task);
907 if (pool->cpu_comp_tasks == NULL) {
912 for_each_online_cpu(cpu) {
913 task = create_comp_task(pool, cpu);
915 kthread_bind(task, cpu);
916 wake_up_process(task);
920 register_hotcpu_notifier(&comp_pool_callback_nb);
922 printk(KERN_INFO "eHCA scaling code enabled\n");
927 void ehca_destroy_comp_pool(void)
931 if (!ehca_scaling_code)
934 unregister_hotcpu_notifier(&comp_pool_callback_nb);
936 for_each_online_cpu(i)
937 destroy_comp_task(pool, i);
939 free_percpu(pool->cpu_comp_tasks);