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staging: lustre: remove top level ccflags variable
[deliverable/linux.git] / drivers / staging / lustre / lustre / libcfs / linux / linux-cpu.c
CommitLineData
d7e09d03
PT		 1/*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA
20 *
21 * GPL HEADER END
22 */
23/*
24 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
25 * Copyright (c) 2012, Intel Corporation.
26 */
27/*
28 * This file is part of Lustre, http://www.lustre.org/
29 * Lustre is a trademark of Sun Microsystems, Inc.
30 *
31 * Author: liang@whamcloud.com
32 */
33
34#define DEBUG_SUBSYSTEM S_LNET
35
36#include <linux/cpu.h>
37#include <linux/sched.h>
9fdaf8c0 38#include "../../../include/linux/libcfs/libcfs.h"
d7e09d03
PT		 39
40#ifdef CONFIG_SMP
41
42/**
43 * modparam for setting number of partitions
44 *
45 * 0 : estimate best value based on cores or NUMA nodes
46 * 1 : disable multiple partitions
47 * >1 : specify number of partitions
48 */
49static int cpu_npartitions;
8cc7b4b9
PT		 50module_param(cpu_npartitions, int, 0444);
51MODULE_PARM_DESC(cpu_npartitions, "# of CPU partitions");
d7e09d03
PT		 52
53/**
54 * modparam for setting CPU partitions patterns:
55 *
56 * i.e: "0[0,1,2,3] 1[4,5,6,7]", number before bracket is CPU partition ID,
57 * number in bracket is processor ID (core or HT)
58 *
59 * i.e: "N 0[0,1] 1[2,3]" the first character 'N' means numbers in bracket
60 * are NUMA node ID, number before bracket is CPU partition ID.
61 *
62 * NB: If user specified cpu_pattern, cpu_npartitions will be ignored
63 */
64static char *cpu_pattern = "";
8cc7b4b9
PT		 65module_param(cpu_pattern, charp, 0444);
66MODULE_PARM_DESC(cpu_pattern, "CPU partitions pattern");
d7e09d03
PT		 67
68struct cfs_cpt_data {
69 /* serialize hotplug etc */
70 spinlock_t cpt_lock;
71 /* reserved for hotplug */
72 unsigned long cpt_version;
73 /* mutex to protect cpt_cpumask */
6246dab1 74 struct mutex cpt_mutex;
d7e09d03
PT		 75 /* scratch buffer for set/unset_node */
76 cpumask_t *cpt_cpumask;
77};
78
79static struct cfs_cpt_data cpt_data;
80
3867ea5a 81static void cfs_cpu_core_siblings(int cpu, cpumask_t *mask)
d7e09d03
PT		 82{
83 /* return cpumask of cores in the same socket */
84 cpumask_copy(mask, topology_core_cpumask(cpu));
85}
d7e09d03
PT		 86
87/* return cpumask of HTs in the same core */
3867ea5a 88static void cfs_cpu_ht_siblings(int cpu, cpumask_t *mask)
d7e09d03
PT		 89{
90 cpumask_copy(mask, topology_thread_cpumask(cpu));
91}
d7e09d03 92
3867ea5a 93static void cfs_node_to_cpumask(int node, cpumask_t *mask)
d7e09d03
PT		 94{
95 cpumask_copy(mask, cpumask_of_node(node));
96}
d7e09d03
PT		 97
98void
99cfs_cpt_table_free(struct cfs_cpt_table *cptab)
100{
101 int i;
102
103 if (cptab->ctb_cpu2cpt != NULL) {
104 LIBCFS_FREE(cptab->ctb_cpu2cpt,
105 num_possible_cpus() *
106 sizeof(cptab->ctb_cpu2cpt[0]));
107 }
108
109 for (i = 0; cptab->ctb_parts != NULL && i < cptab->ctb_nparts; i++) {
110 struct cfs_cpu_partition *part = &cptab->ctb_parts[i];
111
112 if (part->cpt_nodemask != NULL) {
113 LIBCFS_FREE(part->cpt_nodemask,
114 sizeof(*part->cpt_nodemask));
115 }
116
117 if (part->cpt_cpumask != NULL)
118 LIBCFS_FREE(part->cpt_cpumask, cpumask_size());
119 }
120
121 if (cptab->ctb_parts != NULL) {
122 LIBCFS_FREE(cptab->ctb_parts,
123 cptab->ctb_nparts * sizeof(cptab->ctb_parts[0]));
124 }
125
126 if (cptab->ctb_nodemask != NULL)
127 LIBCFS_FREE(cptab->ctb_nodemask, sizeof(*cptab->ctb_nodemask));
128 if (cptab->ctb_cpumask != NULL)
129 LIBCFS_FREE(cptab->ctb_cpumask, cpumask_size());
130
131 LIBCFS_FREE(cptab, sizeof(*cptab));
132}
133EXPORT_SYMBOL(cfs_cpt_table_free);
134
135struct cfs_cpt_table *
136cfs_cpt_table_alloc(unsigned int ncpt)
137{
138 struct cfs_cpt_table *cptab;
139 int i;
140
141 LIBCFS_ALLOC(cptab, sizeof(*cptab));
142 if (cptab == NULL)
143 return NULL;
144
145 cptab->ctb_nparts = ncpt;
146
147 LIBCFS_ALLOC(cptab->ctb_cpumask, cpumask_size());
148 LIBCFS_ALLOC(cptab->ctb_nodemask, sizeof(*cptab->ctb_nodemask));
149
150 if (cptab->ctb_cpumask == NULL || cptab->ctb_nodemask == NULL)
151 goto failed;
152
153 LIBCFS_ALLOC(cptab->ctb_cpu2cpt,
154 num_possible_cpus() * sizeof(cptab->ctb_cpu2cpt[0]));
155 if (cptab->ctb_cpu2cpt == NULL)
156 goto failed;
157
158 memset(cptab->ctb_cpu2cpt, -1,
159 num_possible_cpus() * sizeof(cptab->ctb_cpu2cpt[0]));
160
161 LIBCFS_ALLOC(cptab->ctb_parts, ncpt * sizeof(cptab->ctb_parts[0]));
162 if (cptab->ctb_parts == NULL)
163 goto failed;
164
165 for (i = 0; i < ncpt; i++) {
166 struct cfs_cpu_partition *part = &cptab->ctb_parts[i];
167
168 LIBCFS_ALLOC(part->cpt_cpumask, cpumask_size());
169 LIBCFS_ALLOC(part->cpt_nodemask, sizeof(*part->cpt_nodemask));
170 if (part->cpt_cpumask == NULL || part->cpt_nodemask == NULL)
171 goto failed;
172 }
173
174 spin_lock(&cpt_data.cpt_lock);
175 /* Reserved for hotplug */
176 cptab->ctb_version = cpt_data.cpt_version;
177 spin_unlock(&cpt_data.cpt_lock);
178
179 return cptab;
180
181 failed:
182 cfs_cpt_table_free(cptab);
183 return NULL;
184}
185EXPORT_SYMBOL(cfs_cpt_table_alloc);
186
187int
188cfs_cpt_table_print(struct cfs_cpt_table *cptab, char *buf, int len)
189{
190 char *tmp = buf;
191 int rc = 0;
192 int i;
193 int j;
194
195 for (i = 0; i < cptab->ctb_nparts; i++) {
196 if (len > 0) {
197 rc = snprintf(tmp, len, "%d\t: ", i);
198 len -= rc;
199 }
200
201 if (len <= 0) {
202 rc = -EFBIG;
203 goto out;
204 }
205
206 tmp += rc;
207 for_each_cpu_mask(j, *cptab->ctb_parts[i].cpt_cpumask) {
208 rc = snprintf(tmp, len, "%d ", j);
209 len -= rc;
210 if (len <= 0) {
211 rc = -EFBIG;
212 goto out;
213 }
214 tmp += rc;
215 }
216
217 *tmp = '\n';
218 tmp++;
219 len--;
220 }
221
222 out:
223 if (rc < 0)
224 return rc;
225
226 return tmp - buf;
227}
228EXPORT_SYMBOL(cfs_cpt_table_print);
229
230int
231cfs_cpt_number(struct cfs_cpt_table *cptab)
232{
233 return cptab->ctb_nparts;
234}
235EXPORT_SYMBOL(cfs_cpt_number);
236
237int
238cfs_cpt_weight(struct cfs_cpt_table *cptab, int cpt)
239{
240 LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
241
242 return cpt == CFS_CPT_ANY ?
243 cpus_weight(*cptab->ctb_cpumask) :
244 cpus_weight(*cptab->ctb_parts[cpt].cpt_cpumask);
245}
246EXPORT_SYMBOL(cfs_cpt_weight);
247
248int
249cfs_cpt_online(struct cfs_cpt_table *cptab, int cpt)
250{
251 LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
252
253 return cpt == CFS_CPT_ANY ?
254 any_online_cpu(*cptab->ctb_cpumask) != NR_CPUS :
255 any_online_cpu(*cptab->ctb_parts[cpt].cpt_cpumask) != NR_CPUS;
256}
257EXPORT_SYMBOL(cfs_cpt_online);
258
259cpumask_t *
260cfs_cpt_cpumask(struct cfs_cpt_table *cptab, int cpt)
261{
262 LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
263
264 return cpt == CFS_CPT_ANY ?
265 cptab->ctb_cpumask : cptab->ctb_parts[cpt].cpt_cpumask;
266}
267EXPORT_SYMBOL(cfs_cpt_cpumask);
268
269nodemask_t *
270cfs_cpt_nodemask(struct cfs_cpt_table *cptab, int cpt)
271{
272 LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
273
274 return cpt == CFS_CPT_ANY ?
275 cptab->ctb_nodemask : cptab->ctb_parts[cpt].cpt_nodemask;
276}
277EXPORT_SYMBOL(cfs_cpt_nodemask);
278
279int
280cfs_cpt_set_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu)
281{
282 int node;
283
284 LASSERT(cpt >= 0 && cpt < cptab->ctb_nparts);
285
286 if (cpu < 0 || cpu >= NR_CPUS || !cpu_online(cpu)) {
287 CDEBUG(D_INFO, "CPU %d is invalid or it's offline\n", cpu);
288 return 0;
289 }
290
291 if (cptab->ctb_cpu2cpt[cpu] != -1) {
292 CDEBUG(D_INFO, "CPU %d is already in partition %d\n",
293 cpu, cptab->ctb_cpu2cpt[cpu]);
294 return 0;
295 }
296
297 cptab->ctb_cpu2cpt[cpu] = cpt;
298
299 LASSERT(!cpu_isset(cpu, *cptab->ctb_cpumask));
300 LASSERT(!cpu_isset(cpu, *cptab->ctb_parts[cpt].cpt_cpumask));
301
302 cpu_set(cpu, *cptab->ctb_cpumask);
303 cpu_set(cpu, *cptab->ctb_parts[cpt].cpt_cpumask);
304
305 node = cpu_to_node(cpu);
306
307 /* first CPU of @node in this CPT table */
308 if (!node_isset(node, *cptab->ctb_nodemask))
309 node_set(node, *cptab->ctb_nodemask);
310
311 /* first CPU of @node in this partition */
312 if (!node_isset(node, *cptab->ctb_parts[cpt].cpt_nodemask))
313 node_set(node, *cptab->ctb_parts[cpt].cpt_nodemask);
314
315 return 1;
316}
317EXPORT_SYMBOL(cfs_cpt_set_cpu);
318
319void
320cfs_cpt_unset_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu)
321{
322 int node;
323 int i;
324
325 LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
326
327 if (cpu < 0 || cpu >= NR_CPUS) {
328 CDEBUG(D_INFO, "Invalid CPU id %d\n", cpu);
329 return;
330 }
331
332 if (cpt == CFS_CPT_ANY) {
333 /* caller doesn't know the partition ID */
334 cpt = cptab->ctb_cpu2cpt[cpu];
335 if (cpt < 0) { /* not set in this CPT-table */
336 CDEBUG(D_INFO, "Try to unset cpu %d which is "
337 "not in CPT-table %p\n", cpt, cptab);
338 return;
339 }
340
341 } else if (cpt != cptab->ctb_cpu2cpt[cpu]) {
342 CDEBUG(D_INFO,
343 "CPU %d is not in cpu-partition %d\n", cpu, cpt);
344 return;
345 }
346
347 LASSERT(cpu_isset(cpu, *cptab->ctb_parts[cpt].cpt_cpumask));
348 LASSERT(cpu_isset(cpu, *cptab->ctb_cpumask));
349
350 cpu_clear(cpu, *cptab->ctb_parts[cpt].cpt_cpumask);
351 cpu_clear(cpu, *cptab->ctb_cpumask);
352 cptab->ctb_cpu2cpt[cpu] = -1;
353
354 node = cpu_to_node(cpu);
355
356 LASSERT(node_isset(node, *cptab->ctb_parts[cpt].cpt_nodemask));
357 LASSERT(node_isset(node, *cptab->ctb_nodemask));
358
359 for_each_cpu_mask(i, *cptab->ctb_parts[cpt].cpt_cpumask) {
360 /* this CPT has other CPU belonging to this node? */
361 if (cpu_to_node(i) == node)
362 break;
363 }
364
365 if (i == NR_CPUS)
366 node_clear(node, *cptab->ctb_parts[cpt].cpt_nodemask);
367
368 for_each_cpu_mask(i, *cptab->ctb_cpumask) {
369 /* this CPT-table has other CPU belonging to this node? */
370 if (cpu_to_node(i) == node)
371 break;
372 }
373
374 if (i == NR_CPUS)
375 node_clear(node, *cptab->ctb_nodemask);
376
377 return;
378}
379EXPORT_SYMBOL(cfs_cpt_unset_cpu);
380
381int
382cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
383{
384 int i;
385
386 if (cpus_weight(*mask) == 0 || any_online_cpu(*mask) == NR_CPUS) {
387 CDEBUG(D_INFO, "No online CPU is found in the CPU mask "
388 "for CPU partition %d\n", cpt);
389 return 0;
390 }
391
392 for_each_cpu_mask(i, *mask) {
393 if (!cfs_cpt_set_cpu(cptab, cpt, i))
394 return 0;
395 }
396
397 return 1;
398}
399EXPORT_SYMBOL(cfs_cpt_set_cpumask);
400
401void
402cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
403{
404 int i;
405
406 for_each_cpu_mask(i, *mask)
407 cfs_cpt_unset_cpu(cptab, cpt, i);
408}
409EXPORT_SYMBOL(cfs_cpt_unset_cpumask);
410
411int
412cfs_cpt_set_node(struct cfs_cpt_table *cptab, int cpt, int node)
413{
414 cpumask_t *mask;
415 int rc;
416
417 if (node < 0 || node >= MAX_NUMNODES) {
418 CDEBUG(D_INFO,
419 "Invalid NUMA id %d for CPU partition %d\n", node, cpt);
420 return 0;
421 }
422
6246dab1 423 mutex_lock(&cpt_data.cpt_mutex);
d7e09d03
PT		 424
425 mask = cpt_data.cpt_cpumask;
426 cfs_node_to_cpumask(node, mask);
427
428 rc = cfs_cpt_set_cpumask(cptab, cpt, mask);
429
6246dab1 430 mutex_unlock(&cpt_data.cpt_mutex);
d7e09d03
PT		 431
432 return rc;
433}
434EXPORT_SYMBOL(cfs_cpt_set_node);
435
436void
437cfs_cpt_unset_node(struct cfs_cpt_table *cptab, int cpt, int node)
438{
439 cpumask_t *mask;
440
441 if (node < 0 || node >= MAX_NUMNODES) {
442 CDEBUG(D_INFO,
443 "Invalid NUMA id %d for CPU partition %d\n", node, cpt);
444 return;
445 }
446
6246dab1 447 mutex_lock(&cpt_data.cpt_mutex);
d7e09d03
PT		 448
449 mask = cpt_data.cpt_cpumask;
450 cfs_node_to_cpumask(node, mask);
451
452 cfs_cpt_unset_cpumask(cptab, cpt, mask);
453
6246dab1 454 mutex_unlock(&cpt_data.cpt_mutex);
d7e09d03
PT		 455}
456EXPORT_SYMBOL(cfs_cpt_unset_node);
457
458int
459cfs_cpt_set_nodemask(struct cfs_cpt_table *cptab, int cpt, nodemask_t *mask)
460{
461 int i;
462
463 for_each_node_mask(i, *mask) {
464 if (!cfs_cpt_set_node(cptab, cpt, i))
465 return 0;
466 }
467
468 return 1;
469}
470EXPORT_SYMBOL(cfs_cpt_set_nodemask);
471
472void
473cfs_cpt_unset_nodemask(struct cfs_cpt_table *cptab, int cpt, nodemask_t *mask)
474{
475 int i;
476
477 for_each_node_mask(i, *mask)
478 cfs_cpt_unset_node(cptab, cpt, i);
479}
480EXPORT_SYMBOL(cfs_cpt_unset_nodemask);
481
482void
483cfs_cpt_clear(struct cfs_cpt_table *cptab, int cpt)
484{
485 int last;
486 int i;
487
488 if (cpt == CFS_CPT_ANY) {
489 last = cptab->ctb_nparts - 1;
490 cpt = 0;
491 } else {
492 last = cpt;
493 }
494
495 for (; cpt <= last; cpt++) {
496 for_each_cpu_mask(i, *cptab->ctb_parts[cpt].cpt_cpumask)
497 cfs_cpt_unset_cpu(cptab, cpt, i);
498 }
499}
500EXPORT_SYMBOL(cfs_cpt_clear);
501
502int
503cfs_cpt_spread_node(struct cfs_cpt_table *cptab, int cpt)
504{
505 nodemask_t *mask;
506 int weight;
507 int rotor;
508 int node;
509
510 /* convert CPU partition ID to HW node id */
511
512 if (cpt < 0 || cpt >= cptab->ctb_nparts) {
513 mask = cptab->ctb_nodemask;
514 rotor = cptab->ctb_spread_rotor++;
515 } else {
516 mask = cptab->ctb_parts[cpt].cpt_nodemask;
517 rotor = cptab->ctb_parts[cpt].cpt_spread_rotor++;
518 }
519
520 weight = nodes_weight(*mask);
521 LASSERT(weight > 0);
522
523 rotor %= weight;
524
525 for_each_node_mask(node, *mask) {
526 if (rotor-- == 0)
527 return node;
528 }
529
530 LBUG();
531 return 0;
532}
533EXPORT_SYMBOL(cfs_cpt_spread_node);
534
535int
536cfs_cpt_current(struct cfs_cpt_table *cptab, int remap)
537{
538 int cpu = smp_processor_id();
539 int cpt = cptab->ctb_cpu2cpt[cpu];
540
541 if (cpt < 0) {
542 if (!remap)
543 return cpt;
544
545 /* don't return negative value for safety of upper layer,
546 * instead we shadow the unknown cpu to a valid partition ID */
547 cpt = cpu % cptab->ctb_nparts;
548 }
549
550 return cpt;
551}
552EXPORT_SYMBOL(cfs_cpt_current);
553
554int
555cfs_cpt_of_cpu(struct cfs_cpt_table *cptab, int cpu)
556{
557 LASSERT(cpu >= 0 && cpu < NR_CPUS);
558
559 return cptab->ctb_cpu2cpt[cpu];
560}
561EXPORT_SYMBOL(cfs_cpt_of_cpu);
562
563int
564cfs_cpt_bind(struct cfs_cpt_table *cptab, int cpt)
565{
566 cpumask_t *cpumask;
567 nodemask_t *nodemask;
568 int rc;
569 int i;
570
571 LASSERT(cpt == CFS_CPT_ANY || (cpt >= 0 && cpt < cptab->ctb_nparts));
572
573 if (cpt == CFS_CPT_ANY) {
574 cpumask = cptab->ctb_cpumask;
575 nodemask = cptab->ctb_nodemask;
576 } else {
577 cpumask = cptab->ctb_parts[cpt].cpt_cpumask;
578 nodemask = cptab->ctb_parts[cpt].cpt_nodemask;
579 }
580
581 if (any_online_cpu(*cpumask) == NR_CPUS) {
582 CERROR("No online CPU found in CPU partition %d, did someone "
583 "do CPU hotplug on system? You might need to reload "
584 "Lustre modules to keep system working well.\n", cpt);
585 return -EINVAL;
586 }
587
588 for_each_online_cpu(i) {
589 if (cpu_isset(i, *cpumask))
590 continue;
591
32654b67 592 rc = set_cpus_allowed_ptr(current, cpumask);
d7e09d03
PT		 593 set_mems_allowed(*nodemask);
594 if (rc == 0)
595 schedule(); /* switch to allowed CPU */
596
597 return rc;
598 }
599
600 /* don't need to set affinity because all online CPUs are covered */
601 return 0;
602}
603EXPORT_SYMBOL(cfs_cpt_bind);
604
605/**
606 * Choose max to \a number CPUs from \a node and set them in \a cpt.
607 * We always prefer to choose CPU in the same core/socket.
608 */
609static int
610cfs_cpt_choose_ncpus(struct cfs_cpt_table *cptab, int cpt,
611 cpumask_t *node, int number)
612{
613 cpumask_t *socket = NULL;
614 cpumask_t *core = NULL;
615 int rc = 0;
616 int cpu;
617
618 LASSERT(number > 0);
619
620 if (number >= cpus_weight(*node)) {
621 while (!cpus_empty(*node)) {
622 cpu = first_cpu(*node);
623
624 rc = cfs_cpt_set_cpu(cptab, cpt, cpu);
625 if (!rc)
626 return -EINVAL;
627 cpu_clear(cpu, *node);
628 }
629 return 0;
630 }
631
632 /* allocate scratch buffer */
633 LIBCFS_ALLOC(socket, cpumask_size());
634 LIBCFS_ALLOC(core, cpumask_size());
635 if (socket == NULL || core == NULL) {
636 rc = -ENOMEM;
637 goto out;
638 }
639
640 while (!cpus_empty(*node)) {
641 cpu = first_cpu(*node);
642
643 /* get cpumask for cores in the same socket */
644 cfs_cpu_core_siblings(cpu, socket);
645 cpus_and(*socket, *socket, *node);
646
647 LASSERT(!cpus_empty(*socket));
648
649 while (!cpus_empty(*socket)) {
650 int i;
651
652 /* get cpumask for hts in the same core */
653 cfs_cpu_ht_siblings(cpu, core);
654 cpus_and(*core, *core, *node);
655
656 LASSERT(!cpus_empty(*core));
657
658 for_each_cpu_mask(i, *core) {
659 cpu_clear(i, *socket);
660 cpu_clear(i, *node);
661
662 rc = cfs_cpt_set_cpu(cptab, cpt, i);
663 if (!rc) {
664 rc = -EINVAL;
665 goto out;
666 }
667
668 if (--number == 0)
669 goto out;
670 }
671 cpu = first_cpu(*socket);
672 }
673 }
674
675 out:
676 if (socket != NULL)
677 LIBCFS_FREE(socket, cpumask_size());
678 if (core != NULL)
679 LIBCFS_FREE(core, cpumask_size());
680 return rc;
681}
682
683#define CPT_WEIGHT_MIN 4u
684
685static unsigned int
686cfs_cpt_num_estimate(void)
687{
688 unsigned nnode = num_online_nodes();
689 unsigned ncpu = num_online_cpus();
690 unsigned ncpt;
691
692 if (ncpu <= CPT_WEIGHT_MIN) {
693 ncpt = 1;
694 goto out;
695 }
696
697 /* generate reasonable number of CPU partitions based on total number
698 * of CPUs, Preferred N should be power2 and match this condition:
699 * 2 * (N - 1)^2 < NCPUS <= 2 * N^2 */
700 for (ncpt = 2; ncpu > 2 * ncpt * ncpt; ncpt <<= 1) {}
701
702 if (ncpt <= nnode) { /* fat numa system */
703 while (nnode > ncpt)
704 nnode >>= 1;
705
706 } else { /* ncpt > nnode */
707 while ((nnode << 1) <= ncpt)
708 nnode <<= 1;
709 }
710
711 ncpt = nnode;
712
713 out:
714#if (BITS_PER_LONG == 32)
715 /* config many CPU partitions on 32-bit system could consume
716 * too much memory */
717 ncpt = min(2U, ncpt);
718#endif
719 while (ncpu % ncpt != 0)
720 ncpt--; /* worst case is 1 */
721
722 return ncpt;
723}
724
725static struct cfs_cpt_table *
726cfs_cpt_table_create(int ncpt)
727{
728 struct cfs_cpt_table *cptab = NULL;
729 cpumask_t *mask = NULL;
730 int cpt = 0;
731 int num;
732 int rc;
733 int i;
734
735 rc = cfs_cpt_num_estimate();
736 if (ncpt <= 0)
737 ncpt = rc;
738
739 if (ncpt > num_online_cpus() || ncpt > 4 * rc) {
740 CWARN("CPU partition number %d is larger than suggested "
741 "value (%d), your system may have performance"
742 "issue or run out of memory while under pressure\n",
743 ncpt, rc);
744 }
745
746 if (num_online_cpus() % ncpt != 0) {
747 CERROR("CPU number %d is not multiple of cpu_npartition %d, "
748 "please try different cpu_npartitions value or"
749 "set pattern string by cpu_pattern=STRING\n",
750 (int)num_online_cpus(), ncpt);
751 goto failed;
752 }
753
754 cptab = cfs_cpt_table_alloc(ncpt);
755 if (cptab == NULL) {
756 CERROR("Failed to allocate CPU map(%d)\n", ncpt);
757 goto failed;
758 }
759
760 num = num_online_cpus() / ncpt;
761 if (num == 0) {
762 CERROR("CPU changed while setting CPU partition\n");
763 goto failed;
764 }
765
766 LIBCFS_ALLOC(mask, cpumask_size());
767 if (mask == NULL) {
768 CERROR("Failed to allocate scratch cpumask\n");
769 goto failed;
770 }
771
772 for_each_online_node(i) {
773 cfs_node_to_cpumask(i, mask);
774
775 while (!cpus_empty(*mask)) {
776 struct cfs_cpu_partition *part;
777 int n;
778
779 if (cpt >= ncpt)
780 goto failed;
781
782 part = &cptab->ctb_parts[cpt];
783
784 n = num - cpus_weight(*part->cpt_cpumask);
785 LASSERT(n > 0);
786
787 rc = cfs_cpt_choose_ncpus(cptab, cpt, mask, n);
788 if (rc < 0)
789 goto failed;
790
791 LASSERT(num >= cpus_weight(*part->cpt_cpumask));
792 if (num == cpus_weight(*part->cpt_cpumask))
793 cpt++;
794 }
795 }
796
797 if (cpt != ncpt ||
798 num != cpus_weight(*cptab->ctb_parts[ncpt - 1].cpt_cpumask)) {
799 CERROR("Expect %d(%d) CPU partitions but got %d(%d), "
800 "CPU hotplug/unplug while setting?\n",
801 cptab->ctb_nparts, num, cpt,
802 cpus_weight(*cptab->ctb_parts[ncpt - 1].cpt_cpumask));
803 goto failed;
804 }
805
806 LIBCFS_FREE(mask, cpumask_size());
807
808 return cptab;
809
810 failed:
811 CERROR("Failed to setup CPU-partition-table with %d "
812 "CPU-partitions, online HW nodes: %d, HW cpus: %d.\n",
813 ncpt, num_online_nodes(), num_online_cpus());
814
815 if (mask != NULL)
816 LIBCFS_FREE(mask, cpumask_size());
817
818 if (cptab != NULL)
819 cfs_cpt_table_free(cptab);
820
821 return NULL;
822}
823
824static struct cfs_cpt_table *
825cfs_cpt_table_create_pattern(char *pattern)
826{
827 struct cfs_cpt_table *cptab;
828 char *str = pattern;
829 int node = 0;
830 int high;
831 int ncpt;
832 int c;
833
834 for (ncpt = 0;; ncpt++) { /* quick scan bracket */
835 str = strchr(str, '[');
836 if (str == NULL)
837 break;
838 str++;
839 }
840
841 str = cfs_trimwhite(pattern);
842 if (*str == 'n' || *str == 'N') {
843 pattern = str + 1;
844 node = 1;
845 }
846
847 if (ncpt == 0 ||
848 (node && ncpt > num_online_nodes()) ||
849 (!node && ncpt > num_online_cpus())) {
850 CERROR("Invalid pattern %s, or too many partitions %d\n",
851 pattern, ncpt);
852 return NULL;
853 }
854
855 high = node ? MAX_NUMNODES - 1 : NR_CPUS - 1;
856
857 cptab = cfs_cpt_table_alloc(ncpt);
858 if (cptab == NULL) {
859 CERROR("Failed to allocate cpu partition table\n");
860 return NULL;
861 }
862
863 for (str = cfs_trimwhite(pattern), c = 0;; c++) {
864 struct cfs_range_expr *range;
865 struct cfs_expr_list *el;
866 char *bracket = strchr(str, '[');
867 int cpt;
868 int rc;
869 int i;
870 int n;
871
872 if (bracket == NULL) {
873 if (*str != 0) {
874 CERROR("Invalid pattern %s\n", str);
875 goto failed;
876 } else if (c != ncpt) {
877 CERROR("expect %d partitions but found %d\n",
878 ncpt, c);
879 goto failed;
880 }
881 break;
882 }
883
16e9f6d4 884 if (sscanf(str, "%d%n", &cpt, &n) < 1) {
d7e09d03
PT		 885 CERROR("Invalid cpu pattern %s\n", str);
886 goto failed;
887 }
888
889 if (cpt < 0 || cpt >= ncpt) {
890 CERROR("Invalid partition id %d, total partitions %d\n",
891 cpt, ncpt);
892 goto failed;
893 }
894
895 if (cfs_cpt_weight(cptab, cpt) != 0) {
896 CERROR("Partition %d has already been set.\n", cpt);
897 goto failed;
898 }
899
900 str = cfs_trimwhite(str + n);
901 if (str != bracket) {
902 CERROR("Invalid pattern %s\n", str);
903 goto failed;
904 }
905
906 bracket = strchr(str, ']');
907 if (bracket == NULL) {
908 CERROR("missing right bracket for cpt %d, %s\n",
909 cpt, str);
910 goto failed;
911 }
912
913 if (cfs_expr_list_parse(str, (bracket - str) + 1,
914 0, high, &el) != 0) {
915 CERROR("Can't parse number range: %s\n", str);
916 goto failed;
917 }
918
919 list_for_each_entry(range, &el->el_exprs, re_link) {
920 for (i = range->re_lo; i <= range->re_hi; i++) {
921 if ((i - range->re_lo) % range->re_stride != 0)
922 continue;
923
924 rc = node ? cfs_cpt_set_node(cptab, cpt, i) :
925 cfs_cpt_set_cpu(cptab, cpt, i);
926 if (!rc) {
927 cfs_expr_list_free(el);
928 goto failed;
929 }
930 }
931 }
932
933 cfs_expr_list_free(el);
934
935 if (!cfs_cpt_online(cptab, cpt)) {
936 CERROR("No online CPU is found on partition %d\n", cpt);
937 goto failed;
938 }
939
940 str = cfs_trimwhite(bracket + 1);
941 }
942
943 return cptab;
944
945 failed:
946 cfs_cpt_table_free(cptab);
947 return NULL;
948}
949
950#ifdef CONFIG_HOTPLUG_CPU
951static int
952cfs_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
953{
954 unsigned int cpu = (unsigned long)hcpu;
6fd67d85 955 bool warn;
d7e09d03
PT		 956
957 switch (action) {
958 case CPU_DEAD:
959 case CPU_DEAD_FROZEN:
960 case CPU_ONLINE:
961 case CPU_ONLINE_FROZEN:
962 spin_lock(&cpt_data.cpt_lock);
963 cpt_data.cpt_version++;
964 spin_unlock(&cpt_data.cpt_lock);
965 default:
6fd67d85
OD		 966 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) {
967 CDEBUG(D_INFO, "CPU changed [cpu %u action %lx]\n",
968 cpu, action);
969 break;
970 }
971
6246dab1 972 mutex_lock(&cpt_data.cpt_mutex);
6fd67d85
OD		 973 /* if all HTs in a core are offline, it may break affinity */
974 cfs_cpu_ht_siblings(cpu, cpt_data.cpt_cpumask);
975 warn = any_online_cpu(*cpt_data.cpt_cpumask) >= nr_cpu_ids;
6246dab1 976 mutex_unlock(&cpt_data.cpt_mutex);
6fd67d85
OD		 977 CDEBUG(warn ? D_WARNING : D_INFO,
978 "Lustre: can't support CPU plug-out well now, "
979 "performance and stability could be impacted "
980 "[CPU %u action: %lx]\n", cpu, action);
d7e09d03
PT		 981 }
982
983 return NOTIFY_OK;
984}
985
986static struct notifier_block cfs_cpu_notifier = {
987 .notifier_call = cfs_cpu_notify,
988 .priority = 0
989};
990
991#endif
992
993void
994cfs_cpu_fini(void)
995{
996 if (cfs_cpt_table != NULL)
997 cfs_cpt_table_free(cfs_cpt_table);
998
999#ifdef CONFIG_HOTPLUG_CPU
1000 unregister_hotcpu_notifier(&cfs_cpu_notifier);
1001#endif
1002 if (cpt_data.cpt_cpumask != NULL)
1003 LIBCFS_FREE(cpt_data.cpt_cpumask, cpumask_size());
1004}
1005
1006int
1007cfs_cpu_init(void)
1008{
1009 LASSERT(cfs_cpt_table == NULL);
1010
1011 memset(&cpt_data, 0, sizeof(cpt_data));
1012
1013 LIBCFS_ALLOC(cpt_data.cpt_cpumask, cpumask_size());
1014 if (cpt_data.cpt_cpumask == NULL) {
1015 CERROR("Failed to allocate scratch buffer\n");
1016 return -1;
1017 }
1018
1019 spin_lock_init(&cpt_data.cpt_lock);
6246dab1 1020 mutex_init(&cpt_data.cpt_mutex);
d7e09d03
PT		 1021
1022#ifdef CONFIG_HOTPLUG_CPU
1023 register_hotcpu_notifier(&cfs_cpu_notifier);
1024#endif
1025
1026 if (*cpu_pattern != 0) {
1027 cfs_cpt_table = cfs_cpt_table_create_pattern(cpu_pattern);
1028 if (cfs_cpt_table == NULL) {
1029 CERROR("Failed to create cptab from pattern %s\n",
1030 cpu_pattern);
1031 goto failed;
1032 }
1033
1034 } else {
1035 cfs_cpt_table = cfs_cpt_table_create(cpu_npartitions);
1036 if (cfs_cpt_table == NULL) {
1037 CERROR("Failed to create ptable with npartitions %d\n",
1038 cpu_npartitions);
1039 goto failed;
1040 }
1041 }
1042
1043 spin_lock(&cpt_data.cpt_lock);
1044 if (cfs_cpt_table->ctb_version != cpt_data.cpt_version) {
1045 spin_unlock(&cpt_data.cpt_lock);
1046 CERROR("CPU hotplug/unplug during setup\n");
1047 goto failed;
1048 }
1049 spin_unlock(&cpt_data.cpt_lock);
1050
1051 LCONSOLE(0, "HW CPU cores: %d, npartitions: %d\n",
1052 num_online_cpus(), cfs_cpt_number(cfs_cpt_table));
1053 return 0;
1054
1055 failed:
1056 cfs_cpu_fini();
1057 return -1;
1058}
1059
1060#endif
Linux kernel - Deliverables
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