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>
9 * Copyright (c) 2005 IBM Corporation
11 * All rights reserved.
13 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are met:
21 * Redistributions of source code must retain the above copyright notice, this
22 * list of conditions and the following disclaimer.
24 * Redistributions in binary form must reproduce the above copyright notice,
25 * this list of conditions and the following disclaimer in the documentation
26 * and/or other materials
27 * provided with the distribution.
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
30 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
33 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
34 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
35 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
36 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
37 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
39 * POSSIBILITY OF SUCH DAMAGE.
42 #include "ehca_classes.h"
44 #include "ehca_iverbs.h"
45 #include "ehca_tools.h"
48 #include "ipz_pt_fn.h"
50 #define EQE_COMPLETION_EVENT EHCA_BMASK_IBM(1,1)
51 #define EQE_CQ_QP_NUMBER EHCA_BMASK_IBM(8,31)
52 #define EQE_EE_IDENTIFIER EHCA_BMASK_IBM(2,7)
53 #define EQE_CQ_NUMBER EHCA_BMASK_IBM(8,31)
54 #define EQE_QP_NUMBER EHCA_BMASK_IBM(8,31)
55 #define EQE_QP_TOKEN EHCA_BMASK_IBM(32,63)
56 #define EQE_CQ_TOKEN EHCA_BMASK_IBM(32,63)
58 #define NEQE_COMPLETION_EVENT EHCA_BMASK_IBM(1,1)
59 #define NEQE_EVENT_CODE EHCA_BMASK_IBM(2,7)
60 #define NEQE_PORT_NUMBER EHCA_BMASK_IBM(8,15)
61 #define NEQE_PORT_AVAILABILITY EHCA_BMASK_IBM(16,16)
63 #define ERROR_DATA_LENGTH EHCA_BMASK_IBM(52,63)
64 #define ERROR_DATA_TYPE EHCA_BMASK_IBM(0,7)
66 static void queue_comp_task(struct ehca_cq *__cq);
68 static struct ehca_comp_pool* pool;
69 #ifdef CONFIG_HOTPLUG_CPU
70 static struct notifier_block comp_pool_callback_nb;
73 static inline void comp_event_callback(struct ehca_cq *cq)
75 if (!cq->ib_cq.comp_handler)
78 spin_lock(&cq->cb_lock);
79 cq->ib_cq.comp_handler(&cq->ib_cq, cq->ib_cq.cq_context);
80 spin_unlock(&cq->cb_lock);
85 static void print_error_data(struct ehca_shca * shca, void* data,
86 u64* rblock, int length)
88 u64 type = EHCA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
89 u64 resource = rblock[1];
92 case 0x1: /* Queue Pair */
94 struct ehca_qp *qp = (struct ehca_qp*)data;
96 /* only print error data if AER is set */
100 ehca_err(&shca->ib_device,
101 "QP 0x%x (resource=%lx) has errors.",
102 qp->ib_qp.qp_num, resource);
105 case 0x4: /* Completion Queue */
107 struct ehca_cq *cq = (struct ehca_cq*)data;
109 ehca_err(&shca->ib_device,
110 "CQ 0x%x (resource=%lx) has errors.",
111 cq->cq_number, resource);
115 ehca_err(&shca->ib_device,
116 "Unknown errror type: %lx on %s.",
117 type, shca->ib_device.name);
121 ehca_err(&shca->ib_device, "Error data is available: %lx.", resource);
122 ehca_err(&shca->ib_device, "EHCA ----- error data begin "
123 "---------------------------------------------------");
124 ehca_dmp(rblock, length, "resource=%lx", resource);
125 ehca_err(&shca->ib_device, "EHCA ----- error data end "
126 "----------------------------------------------------");
131 int ehca_error_data(struct ehca_shca *shca, void *data,
137 unsigned long block_count;
139 rblock = ehca_alloc_fw_ctrlblock(GFP_ATOMIC);
141 ehca_err(&shca->ib_device, "Cannot allocate rblock memory.");
146 /* rblock must be 4K aligned and should be 4K large */
147 ret = hipz_h_error_data(shca->ipz_hca_handle,
152 if (ret == H_R_STATE)
153 ehca_err(&shca->ib_device,
154 "No error data is available: %lx.", resource);
155 else if (ret == H_SUCCESS) {
158 length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]);
160 if (length > EHCA_PAGESIZE)
161 length = EHCA_PAGESIZE;
163 print_error_data(shca, data, rblock, length);
165 ehca_err(&shca->ib_device,
166 "Error data could not be fetched: %lx", resource);
168 ehca_free_fw_ctrlblock(rblock);
175 static void qp_event_callback(struct ehca_shca *shca,
177 enum ib_event_type event_type)
179 struct ib_event event;
182 u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
184 spin_lock_irqsave(&ehca_qp_idr_lock, flags);
185 qp = idr_find(&ehca_qp_idr, token);
186 spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
192 ehca_error_data(shca, qp, qp->ipz_qp_handle.handle);
194 if (!qp->ib_qp.event_handler)
197 event.device = &shca->ib_device;
198 event.event = event_type;
199 event.element.qp = &qp->ib_qp;
201 qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context);
206 static void cq_event_callback(struct ehca_shca *shca,
211 u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
213 spin_lock_irqsave(&ehca_cq_idr_lock, flags);
214 cq = idr_find(&ehca_cq_idr, token);
215 spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
220 ehca_error_data(shca, cq, cq->ipz_cq_handle.handle);
225 static void parse_identifier(struct ehca_shca *shca, u64 eqe)
227 u8 identifier = EHCA_BMASK_GET(EQE_EE_IDENTIFIER, eqe);
229 switch (identifier) {
230 case 0x02: /* path migrated */
231 qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG);
233 case 0x03: /* communication established */
234 qp_event_callback(shca, eqe, IB_EVENT_COMM_EST);
236 case 0x04: /* send queue drained */
237 qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED);
239 case 0x05: /* QP error */
240 case 0x06: /* QP error */
241 qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL);
243 case 0x07: /* CQ error */
244 case 0x08: /* CQ error */
245 cq_event_callback(shca, eqe);
247 case 0x09: /* MRMWPTE error */
248 ehca_err(&shca->ib_device, "MRMWPTE error.");
250 case 0x0A: /* port event */
251 ehca_err(&shca->ib_device, "Port event.");
253 case 0x0B: /* MR access error */
254 ehca_err(&shca->ib_device, "MR access error.");
256 case 0x0C: /* EQ error */
257 ehca_err(&shca->ib_device, "EQ error.");
259 case 0x0D: /* P/Q_Key mismatch */
260 ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
262 case 0x10: /* sampling complete */
263 ehca_err(&shca->ib_device, "Sampling complete.");
265 case 0x11: /* unaffiliated access error */
266 ehca_err(&shca->ib_device, "Unaffiliated access error.");
268 case 0x12: /* path migrating error */
269 ehca_err(&shca->ib_device, "Path migration error.");
271 case 0x13: /* interface trace stopped */
272 ehca_err(&shca->ib_device, "Interface trace stopped.");
274 case 0x14: /* first error capture info available */
276 ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.",
277 identifier, shca->ib_device.name);
284 static void parse_ec(struct ehca_shca *shca, u64 eqe)
286 struct ib_event event;
287 u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
288 u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
291 case 0x30: /* port availability change */
292 if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
293 ehca_info(&shca->ib_device,
294 "port %x is active.", port);
295 event.device = &shca->ib_device;
296 event.event = IB_EVENT_PORT_ACTIVE;
297 event.element.port_num = port;
298 shca->sport[port - 1].port_state = IB_PORT_ACTIVE;
299 ib_dispatch_event(&event);
301 ehca_info(&shca->ib_device,
302 "port %x is inactive.", port);
303 event.device = &shca->ib_device;
304 event.event = IB_EVENT_PORT_ERR;
305 event.element.port_num = port;
306 shca->sport[port - 1].port_state = IB_PORT_DOWN;
307 ib_dispatch_event(&event);
311 /* port configuration change
312 * disruptive change is caused by
313 * LID, PKEY or SM change
315 ehca_warn(&shca->ib_device,
316 "disruptive port %x configuration change", port);
318 ehca_info(&shca->ib_device,
319 "port %x is inactive.", port);
320 event.device = &shca->ib_device;
321 event.event = IB_EVENT_PORT_ERR;
322 event.element.port_num = port;
323 shca->sport[port - 1].port_state = IB_PORT_DOWN;
324 ib_dispatch_event(&event);
326 ehca_info(&shca->ib_device,
327 "port %x is active.", port);
328 event.device = &shca->ib_device;
329 event.event = IB_EVENT_PORT_ACTIVE;
330 event.element.port_num = port;
331 shca->sport[port - 1].port_state = IB_PORT_ACTIVE;
332 ib_dispatch_event(&event);
334 case 0x32: /* adapter malfunction */
335 ehca_err(&shca->ib_device, "Adapter malfunction.");
337 case 0x33: /* trace stopped */
338 ehca_err(&shca->ib_device, "Traced stopped.");
341 ehca_err(&shca->ib_device, "Unknown event code: %x on %s.",
342 ec, shca->ib_device.name);
349 static inline void reset_eq_pending(struct ehca_cq *cq)
352 struct h_galpa gal = cq->galpas.kernel;
354 hipz_galpa_store_cq(gal, cqx_ep, 0x0);
355 CQx_EP = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_ep));
360 irqreturn_t ehca_interrupt_neq(int irq, void *dev_id)
362 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
364 tasklet_hi_schedule(&shca->neq.interrupt_task);
369 void ehca_tasklet_neq(unsigned long data)
371 struct ehca_shca *shca = (struct ehca_shca*)data;
372 struct ehca_eqe *eqe;
375 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
378 if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry))
379 parse_ec(shca, eqe->entry);
381 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
384 ret = hipz_h_reset_event(shca->ipz_hca_handle,
385 shca->neq.ipz_eq_handle, 0xFFFFFFFFFFFFFFFFL);
387 if (ret != H_SUCCESS)
388 ehca_err(&shca->ib_device, "Can't clear notification events.");
393 irqreturn_t ehca_interrupt_eq(int irq, void *dev_id)
395 struct ehca_shca *shca = (struct ehca_shca*)dev_id;
397 tasklet_hi_schedule(&shca->eq.interrupt_task);
403 static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe)
410 eqe_value = eqe->entry;
411 ehca_dbg(&shca->ib_device, "eqe_value=%lx", eqe_value);
412 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
413 ehca_dbg(&shca->ib_device, "Got completion event");
414 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
415 spin_lock_irqsave(&ehca_cq_idr_lock, flags);
416 cq = idr_find(&ehca_cq_idr, token);
418 spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
419 ehca_err(&shca->ib_device,
420 "Invalid eqe for non-existing cq token=%x",
424 reset_eq_pending(cq);
426 spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
427 if (ehca_scaling_code)
430 comp_event_callback(cq);
431 spin_lock_irqsave(&ehca_cq_idr_lock, flags);
434 wake_up(&cq->wait_completion);
435 spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
438 ehca_dbg(&shca->ib_device, "Got non completion event");
439 parse_identifier(shca, eqe_value);
443 void ehca_process_eq(struct ehca_shca *shca, int is_irq)
445 struct ehca_eq *eq = &shca->eq;
446 struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
452 spin_lock_irqsave(&eq->irq_spinlock, flags);
454 const int max_query_cnt = 100;
458 int_state = hipz_h_query_int_state(
459 shca->ipz_hca_handle, eq->ist);
462 } while (int_state && query_cnt < max_query_cnt);
463 if (unlikely((query_cnt == max_query_cnt)))
464 ehca_dbg(&shca->ib_device, "int_state=%x query_cnt=%x",
465 int_state, query_cnt);
468 /* read out all eqes */
472 eqe_cache[eqe_cnt].eqe =
473 (struct ehca_eqe *)ehca_poll_eq(shca, eq);
474 if (!eqe_cache[eqe_cnt].eqe)
476 eqe_value = eqe_cache[eqe_cnt].eqe->entry;
477 if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
478 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
479 spin_lock(&ehca_cq_idr_lock);
480 eqe_cache[eqe_cnt].cq = idr_find(&ehca_cq_idr, token);
481 if (!eqe_cache[eqe_cnt].cq) {
482 spin_unlock(&ehca_cq_idr_lock);
483 ehca_err(&shca->ib_device,
484 "Invalid eqe for non-existing cq "
488 eqe_cache[eqe_cnt].cq->nr_events++;
489 spin_unlock(&ehca_cq_idr_lock);
491 eqe_cache[eqe_cnt].cq = NULL;
493 } while (eqe_cnt < EHCA_EQE_CACHE_SIZE);
496 ehca_dbg(&shca->ib_device,
497 "No eqe found for irq event");
498 goto unlock_irq_spinlock;
500 ehca_dbg(&shca->ib_device, "deadman found %x eqe", eqe_cnt);
501 if (unlikely(eqe_cnt == EHCA_EQE_CACHE_SIZE))
502 ehca_dbg(&shca->ib_device, "too many eqes for one irq event");
503 /* enable irq for new packets */
504 for (i = 0; i < eqe_cnt; i++) {
505 if (eq->eqe_cache[i].cq)
506 reset_eq_pending(eq->eqe_cache[i].cq);
509 spin_lock(&eq->spinlock);
510 eq_empty = (!ipz_eqit_eq_peek_valid(&shca->eq.ipz_queue));
511 spin_unlock(&eq->spinlock);
512 /* call completion handler for cached eqes */
513 for (i = 0; i < eqe_cnt; i++)
514 if (eq->eqe_cache[i].cq) {
515 if (ehca_scaling_code)
516 queue_comp_task(eq->eqe_cache[i].cq);
518 struct ehca_cq *cq = eq->eqe_cache[i].cq;
519 comp_event_callback(cq);
520 spin_lock_irqsave(&ehca_cq_idr_lock, flags);
523 wake_up(&cq->wait_completion);
524 spin_unlock_irqrestore(&ehca_cq_idr_lock,
528 ehca_dbg(&shca->ib_device, "Got non completion event");
529 parse_identifier(shca, eq->eqe_cache[i].eqe->entry);
531 /* poll eq if not empty */
533 goto unlock_irq_spinlock;
535 struct ehca_eqe *eqe;
536 eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
539 process_eqe(shca, eqe);
543 spin_unlock_irqrestore(&eq->irq_spinlock, flags);
546 void ehca_tasklet_eq(unsigned long data)
548 ehca_process_eq((struct ehca_shca*)data, 1);
551 static inline int find_next_online_cpu(struct ehca_comp_pool* pool)
556 WARN_ON_ONCE(!in_interrupt());
557 if (ehca_debug_level)
558 ehca_dmp(&cpu_online_map, sizeof(cpumask_t), "");
560 spin_lock_irqsave(&pool->last_cpu_lock, flags);
561 cpu = next_cpu(pool->last_cpu, cpu_online_map);
563 cpu = first_cpu(cpu_online_map);
564 pool->last_cpu = cpu;
565 spin_unlock_irqrestore(&pool->last_cpu_lock, flags);
570 static void __queue_comp_task(struct ehca_cq *__cq,
571 struct ehca_cpu_comp_task *cct)
575 spin_lock_irqsave(&cct->task_lock, flags);
576 spin_lock(&__cq->task_lock);
578 if (__cq->nr_callbacks == 0) {
579 __cq->nr_callbacks++;
580 list_add_tail(&__cq->entry, &cct->cq_list);
582 wake_up(&cct->wait_queue);
584 __cq->nr_callbacks++;
586 spin_unlock(&__cq->task_lock);
587 spin_unlock_irqrestore(&cct->task_lock, flags);
590 static void queue_comp_task(struct ehca_cq *__cq)
593 struct ehca_cpu_comp_task *cct;
597 cpu_id = find_next_online_cpu(pool);
598 BUG_ON(!cpu_online(cpu_id));
600 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
603 spin_lock_irqsave(&cct->task_lock, flags);
604 cq_jobs = cct->cq_jobs;
605 spin_unlock_irqrestore(&cct->task_lock, flags);
607 cpu_id = find_next_online_cpu(pool);
608 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
612 __queue_comp_task(__cq, cct);
615 static void run_comp_task(struct ehca_cpu_comp_task* cct)
620 spin_lock_irqsave(&cct->task_lock, flags);
622 while (!list_empty(&cct->cq_list)) {
623 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
624 spin_unlock_irqrestore(&cct->task_lock, flags);
625 comp_event_callback(cq);
627 spin_lock_irqsave(&ehca_cq_idr_lock, flags);
630 wake_up(&cq->wait_completion);
631 spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
633 spin_lock_irqsave(&cct->task_lock, flags);
634 spin_lock(&cq->task_lock);
636 if (!cq->nr_callbacks) {
637 list_del_init(cct->cq_list.next);
640 spin_unlock(&cq->task_lock);
643 spin_unlock_irqrestore(&cct->task_lock, flags);
646 static int comp_task(void *__cct)
648 struct ehca_cpu_comp_task* cct = __cct;
650 DECLARE_WAITQUEUE(wait, current);
652 set_current_state(TASK_INTERRUPTIBLE);
653 while(!kthread_should_stop()) {
654 add_wait_queue(&cct->wait_queue, &wait);
656 spin_lock_irq(&cct->task_lock);
657 cql_empty = list_empty(&cct->cq_list);
658 spin_unlock_irq(&cct->task_lock);
662 __set_current_state(TASK_RUNNING);
664 remove_wait_queue(&cct->wait_queue, &wait);
666 spin_lock_irq(&cct->task_lock);
667 cql_empty = list_empty(&cct->cq_list);
668 spin_unlock_irq(&cct->task_lock);
670 run_comp_task(__cct);
672 set_current_state(TASK_INTERRUPTIBLE);
674 __set_current_state(TASK_RUNNING);
679 static struct task_struct *create_comp_task(struct ehca_comp_pool *pool,
682 struct ehca_cpu_comp_task *cct;
684 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
685 spin_lock_init(&cct->task_lock);
686 INIT_LIST_HEAD(&cct->cq_list);
687 init_waitqueue_head(&cct->wait_queue);
688 cct->task = kthread_create(comp_task, cct, "ehca_comp/%d", cpu);
693 static void destroy_comp_task(struct ehca_comp_pool *pool,
696 struct ehca_cpu_comp_task *cct;
697 struct task_struct *task;
698 unsigned long flags_cct;
700 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
702 spin_lock_irqsave(&cct->task_lock, flags_cct);
708 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
714 static void take_over_work(struct ehca_comp_pool *pool,
717 struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
720 unsigned long flags_cct;
722 spin_lock_irqsave(&cct->task_lock, flags_cct);
724 list_splice_init(&cct->cq_list, &list);
726 while(!list_empty(&list)) {
727 cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
729 list_del(&cq->entry);
730 __queue_comp_task(cq, per_cpu_ptr(pool->cpu_comp_tasks,
731 smp_processor_id()));
734 spin_unlock_irqrestore(&cct->task_lock, flags_cct);
738 #ifdef CONFIG_HOTPLUG_CPU
739 static int comp_pool_callback(struct notifier_block *nfb,
740 unsigned long action,
743 unsigned int cpu = (unsigned long)hcpu;
744 struct ehca_cpu_comp_task *cct;
748 case CPU_UP_PREPARE_FROZEN:
749 ehca_gen_dbg("CPU: %x (CPU_PREPARE)", cpu);
750 if(!create_comp_task(pool, cpu)) {
751 ehca_gen_err("Can't create comp_task for cpu: %x", cpu);
755 case CPU_UP_CANCELED:
756 case CPU_UP_CANCELED_FROZEN:
757 ehca_gen_dbg("CPU: %x (CPU_CANCELED)", cpu);
758 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
759 kthread_bind(cct->task, any_online_cpu(cpu_online_map));
760 destroy_comp_task(pool, cpu);
763 case CPU_ONLINE_FROZEN:
764 ehca_gen_dbg("CPU: %x (CPU_ONLINE)", cpu);
765 cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
766 kthread_bind(cct->task, cpu);
767 wake_up_process(cct->task);
769 case CPU_DOWN_PREPARE:
770 case CPU_DOWN_PREPARE_FROZEN:
771 ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
773 case CPU_DOWN_FAILED:
774 case CPU_DOWN_FAILED_FROZEN:
775 ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
778 case CPU_DEAD_FROZEN:
779 ehca_gen_dbg("CPU: %x (CPU_DEAD)", cpu);
780 destroy_comp_task(pool, cpu);
781 take_over_work(pool, cpu);
789 int ehca_create_comp_pool(void)
792 struct task_struct *task;
794 if (!ehca_scaling_code)
797 pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
801 spin_lock_init(&pool->last_cpu_lock);
802 pool->last_cpu = any_online_cpu(cpu_online_map);
804 pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task);
805 if (pool->cpu_comp_tasks == NULL) {
810 for_each_online_cpu(cpu) {
811 task = create_comp_task(pool, cpu);
813 kthread_bind(task, cpu);
814 wake_up_process(task);
818 #ifdef CONFIG_HOTPLUG_CPU
819 comp_pool_callback_nb.notifier_call = comp_pool_callback;
820 comp_pool_callback_nb.priority =0;
821 register_cpu_notifier(&comp_pool_callback_nb);
824 printk(KERN_INFO "eHCA scaling code enabled\n");
829 void ehca_destroy_comp_pool(void)
833 if (!ehca_scaling_code)
836 #ifdef CONFIG_HOTPLUG_CPU
837 unregister_cpu_notifier(&comp_pool_callback_nb);
840 for (i = 0; i < NR_CPUS; i++) {
842 destroy_comp_task(pool, i);
844 free_percpu(pool->cpu_comp_tasks);