Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007, 2011
4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
5 */
6
7#define KMSG_COMPONENT "cpu"
8#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10#include <linux/workqueue.h>
11#include <linux/bootmem.h>
12#include <linux/uaccess.h>
13#include <linux/sysctl.h>
14#include <linux/cpuset.h>
15#include <linux/device.h>
16#include <linux/export.h>
17#include <linux/kernel.h>
18#include <linux/sched.h>
19#include <linux/sched/topology.h>
20#include <linux/delay.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/cpu.h>
24#include <linux/smp.h>
25#include <linux/mm.h>
26#include <linux/nodemask.h>
27#include <linux/node.h>
28#include <asm/sysinfo.h>
29#include <asm/numa.h>
30
31#define PTF_HORIZONTAL (0UL)
32#define PTF_VERTICAL (1UL)
33#define PTF_CHECK (2UL)
34
35enum {
36 TOPOLOGY_MODE_HW,
37 TOPOLOGY_MODE_SINGLE,
38 TOPOLOGY_MODE_PACKAGE,
39 TOPOLOGY_MODE_UNINITIALIZED
40};
41
42struct mask_info {
43 struct mask_info *next;
44 unsigned char id;
45 cpumask_t mask;
46};
47
48static int topology_mode = TOPOLOGY_MODE_UNINITIALIZED;
49static void set_topology_timer(void);
50static void topology_work_fn(struct work_struct *work);
51static struct sysinfo_15_1_x *tl_info;
52
53static DECLARE_WORK(topology_work, topology_work_fn);
54
55/*
56 * Socket/Book linked lists and cpu_topology updates are
57 * protected by "sched_domains_mutex".
58 */
59static struct mask_info socket_info;
60static struct mask_info book_info;
61static struct mask_info drawer_info;
62
63struct cpu_topology_s390 cpu_topology[NR_CPUS];
64EXPORT_SYMBOL_GPL(cpu_topology);
65
66cpumask_t cpus_with_topology;
67
68static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
69{
70 cpumask_t mask;
71
72 cpumask_copy(&mask, cpumask_of(cpu));
73 switch (topology_mode) {
74 case TOPOLOGY_MODE_HW:
75 while (info) {
76 if (cpumask_test_cpu(cpu, &info->mask)) {
77 mask = info->mask;
78 break;
79 }
80 info = info->next;
81 }
82 if (cpumask_empty(&mask))
83 cpumask_copy(&mask, cpumask_of(cpu));
84 break;
85 case TOPOLOGY_MODE_PACKAGE:
86 cpumask_copy(&mask, cpu_present_mask);
87 break;
88 default:
89 /* fallthrough */
90 case TOPOLOGY_MODE_SINGLE:
91 cpumask_copy(&mask, cpumask_of(cpu));
92 break;
93 }
94 return mask;
95}
96
97static cpumask_t cpu_thread_map(unsigned int cpu)
98{
99 cpumask_t mask;
100 int i;
101
102 cpumask_copy(&mask, cpumask_of(cpu));
103 if (topology_mode != TOPOLOGY_MODE_HW)
104 return mask;
105 cpu -= cpu % (smp_cpu_mtid + 1);
106 for (i = 0; i <= smp_cpu_mtid; i++)
107 if (cpu_present(cpu + i))
108 cpumask_set_cpu(cpu + i, &mask);
109 return mask;
110}
111
112#define TOPOLOGY_CORE_BITS 64
113
114static void add_cpus_to_mask(struct topology_core *tl_core,
115 struct mask_info *drawer,
116 struct mask_info *book,
117 struct mask_info *socket)
118{
119 struct cpu_topology_s390 *topo;
120 unsigned int core;
121
122 for_each_set_bit(core, &tl_core->mask, TOPOLOGY_CORE_BITS) {
123 unsigned int rcore;
124 int lcpu, i;
125
126 rcore = TOPOLOGY_CORE_BITS - 1 - core + tl_core->origin;
127 lcpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
128 if (lcpu < 0)
129 continue;
130 for (i = 0; i <= smp_cpu_mtid; i++) {
131 topo = &cpu_topology[lcpu + i];
132 topo->drawer_id = drawer->id;
133 topo->book_id = book->id;
134 topo->socket_id = socket->id;
135 topo->core_id = rcore;
136 topo->thread_id = lcpu + i;
137 topo->dedicated = tl_core->d;
138 cpumask_set_cpu(lcpu + i, &drawer->mask);
139 cpumask_set_cpu(lcpu + i, &book->mask);
140 cpumask_set_cpu(lcpu + i, &socket->mask);
141 cpumask_set_cpu(lcpu + i, &cpus_with_topology);
142 smp_cpu_set_polarization(lcpu + i, tl_core->pp);
143 }
144 }
145}
146
147static void clear_masks(void)
148{
149 struct mask_info *info;
150
151 info = &socket_info;
152 while (info) {
153 cpumask_clear(&info->mask);
154 info = info->next;
155 }
156 info = &book_info;
157 while (info) {
158 cpumask_clear(&info->mask);
159 info = info->next;
160 }
161 info = &drawer_info;
162 while (info) {
163 cpumask_clear(&info->mask);
164 info = info->next;
165 }
166}
167
168static union topology_entry *next_tle(union topology_entry *tle)
169{
170 if (!tle->nl)
171 return (union topology_entry *)((struct topology_core *)tle + 1);
172 return (union topology_entry *)((struct topology_container *)tle + 1);
173}
174
175static void tl_to_masks(struct sysinfo_15_1_x *info)
176{
177 struct mask_info *socket = &socket_info;
178 struct mask_info *book = &book_info;
179 struct mask_info *drawer = &drawer_info;
180 union topology_entry *tle, *end;
181
182 clear_masks();
183 tle = info->tle;
184 end = (union topology_entry *)((unsigned long)info + info->length);
185 while (tle < end) {
186 switch (tle->nl) {
187 case 3:
188 drawer = drawer->next;
189 drawer->id = tle->container.id;
190 break;
191 case 2:
192 book = book->next;
193 book->id = tle->container.id;
194 break;
195 case 1:
196 socket = socket->next;
197 socket->id = tle->container.id;
198 break;
199 case 0:
200 add_cpus_to_mask(&tle->cpu, drawer, book, socket);
201 break;
202 default:
203 clear_masks();
204 return;
205 }
206 tle = next_tle(tle);
207 }
208}
209
210static void topology_update_polarization_simple(void)
211{
212 int cpu;
213
214 for_each_possible_cpu(cpu)
215 smp_cpu_set_polarization(cpu, POLARIZATION_HRZ);
216}
217
218static int ptf(unsigned long fc)
219{
220 int rc;
221
222 asm volatile(
223 " .insn rre,0xb9a20000,%1,%1\n"
224 " ipm %0\n"
225 " srl %0,28\n"
226 : "=d" (rc)
227 : "d" (fc) : "cc");
228 return rc;
229}
230
231int topology_set_cpu_management(int fc)
232{
233 int cpu, rc;
234
235 if (!MACHINE_HAS_TOPOLOGY)
236 return -EOPNOTSUPP;
237 if (fc)
238 rc = ptf(PTF_VERTICAL);
239 else
240 rc = ptf(PTF_HORIZONTAL);
241 if (rc)
242 return -EBUSY;
243 for_each_possible_cpu(cpu)
244 smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
245 return rc;
246}
247
248static void update_cpu_masks(void)
249{
250 struct cpu_topology_s390 *topo;
251 int cpu, id;
252
253 for_each_possible_cpu(cpu) {
254 topo = &cpu_topology[cpu];
255 topo->thread_mask = cpu_thread_map(cpu);
256 topo->core_mask = cpu_group_map(&socket_info, cpu);
257 topo->book_mask = cpu_group_map(&book_info, cpu);
258 topo->drawer_mask = cpu_group_map(&drawer_info, cpu);
259 if (topology_mode != TOPOLOGY_MODE_HW) {
260 id = topology_mode == TOPOLOGY_MODE_PACKAGE ? 0 : cpu;
261 topo->thread_id = cpu;
262 topo->core_id = cpu;
263 topo->socket_id = id;
264 topo->book_id = id;
265 topo->drawer_id = id;
266 if (cpu_present(cpu))
267 cpumask_set_cpu(cpu, &cpus_with_topology);
268 }
269 }
270 numa_update_cpu_topology();
271}
272
273void store_topology(struct sysinfo_15_1_x *info)
274{
275 stsi(info, 15, 1, topology_mnest_limit());
276}
277
278static void __arch_update_dedicated_flag(void *arg)
279{
280 if (topology_cpu_dedicated(smp_processor_id()))
281 set_cpu_flag(CIF_DEDICATED_CPU);
282 else
283 clear_cpu_flag(CIF_DEDICATED_CPU);
284}
285
286static int __arch_update_cpu_topology(void)
287{
288 struct sysinfo_15_1_x *info = tl_info;
289 int rc = 0;
290
291 mutex_lock(&smp_cpu_state_mutex);
292 cpumask_clear(&cpus_with_topology);
293 if (MACHINE_HAS_TOPOLOGY) {
294 rc = 1;
295 store_topology(info);
296 tl_to_masks(info);
297 }
298 update_cpu_masks();
299 if (!MACHINE_HAS_TOPOLOGY)
300 topology_update_polarization_simple();
301 mutex_unlock(&smp_cpu_state_mutex);
302 return rc;
303}
304
305int arch_update_cpu_topology(void)
306{
307 struct device *dev;
308 int cpu, rc;
309
310 rc = __arch_update_cpu_topology();
311 on_each_cpu(__arch_update_dedicated_flag, NULL, 0);
312 for_each_online_cpu(cpu) {
313 dev = get_cpu_device(cpu);
314 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
315 }
316 return rc;
317}
318
319static void topology_work_fn(struct work_struct *work)
320{
321 rebuild_sched_domains();
322}
323
324void topology_schedule_update(void)
325{
326 schedule_work(&topology_work);
327}
328
329static void topology_flush_work(void)
330{
331 flush_work(&topology_work);
332}
333
334static void topology_timer_fn(struct timer_list *unused)
335{
336 if (ptf(PTF_CHECK))
337 topology_schedule_update();
338 set_topology_timer();
339}
340
341static struct timer_list topology_timer;
342
343static atomic_t topology_poll = ATOMIC_INIT(0);
344
345static void set_topology_timer(void)
346{
347 if (atomic_add_unless(&topology_poll, -1, 0))
348 mod_timer(&topology_timer, jiffies + HZ / 10);
349 else
350 mod_timer(&topology_timer, jiffies + HZ * 60);
351}
352
353void topology_expect_change(void)
354{
355 if (!MACHINE_HAS_TOPOLOGY)
356 return;
357 /* This is racy, but it doesn't matter since it is just a heuristic.
358 * Worst case is that we poll in a higher frequency for a bit longer.
359 */
360 if (atomic_read(&topology_poll) > 60)
361 return;
362 atomic_add(60, &topology_poll);
363 set_topology_timer();
364}
365
366static int cpu_management;
367
368static ssize_t dispatching_show(struct device *dev,
369 struct device_attribute *attr,
370 char *buf)
371{
372 ssize_t count;
373
374 mutex_lock(&smp_cpu_state_mutex);
375 count = sprintf(buf, "%d\n", cpu_management);
376 mutex_unlock(&smp_cpu_state_mutex);
377 return count;
378}
379
380static ssize_t dispatching_store(struct device *dev,
381 struct device_attribute *attr,
382 const char *buf,
383 size_t count)
384{
385 int val, rc;
386 char delim;
387
388 if (sscanf(buf, "%d %c", &val, &delim) != 1)
389 return -EINVAL;
390 if (val != 0 && val != 1)
391 return -EINVAL;
392 rc = 0;
393 get_online_cpus();
394 mutex_lock(&smp_cpu_state_mutex);
395 if (cpu_management == val)
396 goto out;
397 rc = topology_set_cpu_management(val);
398 if (rc)
399 goto out;
400 cpu_management = val;
401 topology_expect_change();
402out:
403 mutex_unlock(&smp_cpu_state_mutex);
404 put_online_cpus();
405 return rc ? rc : count;
406}
407static DEVICE_ATTR_RW(dispatching);
408
409static ssize_t cpu_polarization_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
411{
412 int cpu = dev->id;
413 ssize_t count;
414
415 mutex_lock(&smp_cpu_state_mutex);
416 switch (smp_cpu_get_polarization(cpu)) {
417 case POLARIZATION_HRZ:
418 count = sprintf(buf, "horizontal\n");
419 break;
420 case POLARIZATION_VL:
421 count = sprintf(buf, "vertical:low\n");
422 break;
423 case POLARIZATION_VM:
424 count = sprintf(buf, "vertical:medium\n");
425 break;
426 case POLARIZATION_VH:
427 count = sprintf(buf, "vertical:high\n");
428 break;
429 default:
430 count = sprintf(buf, "unknown\n");
431 break;
432 }
433 mutex_unlock(&smp_cpu_state_mutex);
434 return count;
435}
436static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
437
438static struct attribute *topology_cpu_attrs[] = {
439 &dev_attr_polarization.attr,
440 NULL,
441};
442
443static struct attribute_group topology_cpu_attr_group = {
444 .attrs = topology_cpu_attrs,
445};
446
447static ssize_t cpu_dedicated_show(struct device *dev,
448 struct device_attribute *attr, char *buf)
449{
450 int cpu = dev->id;
451 ssize_t count;
452
453 mutex_lock(&smp_cpu_state_mutex);
454 count = sprintf(buf, "%d\n", topology_cpu_dedicated(cpu));
455 mutex_unlock(&smp_cpu_state_mutex);
456 return count;
457}
458static DEVICE_ATTR(dedicated, 0444, cpu_dedicated_show, NULL);
459
460static struct attribute *topology_extra_cpu_attrs[] = {
461 &dev_attr_dedicated.attr,
462 NULL,
463};
464
465static struct attribute_group topology_extra_cpu_attr_group = {
466 .attrs = topology_extra_cpu_attrs,
467};
468
469int topology_cpu_init(struct cpu *cpu)
470{
471 int rc;
472
473 rc = sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
474 if (rc || !MACHINE_HAS_TOPOLOGY)
475 return rc;
476 rc = sysfs_create_group(&cpu->dev.kobj, &topology_extra_cpu_attr_group);
477 if (rc)
478 sysfs_remove_group(&cpu->dev.kobj, &topology_cpu_attr_group);
479 return rc;
480}
481
482static const struct cpumask *cpu_thread_mask(int cpu)
483{
484 return &cpu_topology[cpu].thread_mask;
485}
486
487
488const struct cpumask *cpu_coregroup_mask(int cpu)
489{
490 return &cpu_topology[cpu].core_mask;
491}
492
493static const struct cpumask *cpu_book_mask(int cpu)
494{
495 return &cpu_topology[cpu].book_mask;
496}
497
498static const struct cpumask *cpu_drawer_mask(int cpu)
499{
500 return &cpu_topology[cpu].drawer_mask;
501}
502
503static struct sched_domain_topology_level s390_topology[] = {
504 { cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
505 { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
506 { cpu_book_mask, SD_INIT_NAME(BOOK) },
507 { cpu_drawer_mask, SD_INIT_NAME(DRAWER) },
508 { cpu_cpu_mask, SD_INIT_NAME(DIE) },
509 { NULL, },
510};
511
512static void __init alloc_masks(struct sysinfo_15_1_x *info,
513 struct mask_info *mask, int offset)
514{
515 int i, nr_masks;
516
517 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
518 for (i = 0; i < info->mnest - offset; i++)
519 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
520 nr_masks = max(nr_masks, 1);
521 for (i = 0; i < nr_masks; i++) {
522 mask->next = memblock_virt_alloc(sizeof(*mask->next), 8);
523 mask = mask->next;
524 }
525}
526
527void __init topology_init_early(void)
528{
529 struct sysinfo_15_1_x *info;
530
531 set_sched_topology(s390_topology);
532 if (topology_mode == TOPOLOGY_MODE_UNINITIALIZED) {
533 if (MACHINE_HAS_TOPOLOGY)
534 topology_mode = TOPOLOGY_MODE_HW;
535 else
536 topology_mode = TOPOLOGY_MODE_SINGLE;
537 }
538 if (!MACHINE_HAS_TOPOLOGY)
539 goto out;
540 tl_info = memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE);
541 info = tl_info;
542 store_topology(info);
543 pr_info("The CPU configuration topology of the machine is: %d %d %d %d %d %d / %d\n",
544 info->mag[0], info->mag[1], info->mag[2], info->mag[3],
545 info->mag[4], info->mag[5], info->mnest);
546 alloc_masks(info, &socket_info, 1);
547 alloc_masks(info, &book_info, 2);
548 alloc_masks(info, &drawer_info, 3);
549out:
550 __arch_update_cpu_topology();
551 __arch_update_dedicated_flag(NULL);
552}
553
554static inline int topology_get_mode(int enabled)
555{
556 if (!enabled)
557 return TOPOLOGY_MODE_SINGLE;
558 return MACHINE_HAS_TOPOLOGY ? TOPOLOGY_MODE_HW : TOPOLOGY_MODE_PACKAGE;
559}
560
561static inline int topology_is_enabled(void)
562{
563 return topology_mode != TOPOLOGY_MODE_SINGLE;
564}
565
566static int __init topology_setup(char *str)
567{
568 bool enabled;
569 int rc;
570
571 rc = kstrtobool(str, &enabled);
572 if (rc)
573 return rc;
574 topology_mode = topology_get_mode(enabled);
575 return 0;
576}
577early_param("topology", topology_setup);
578
579static int topology_ctl_handler(struct ctl_table *ctl, int write,
580 void __user *buffer, size_t *lenp, loff_t *ppos)
581{
582 unsigned int len;
583 int new_mode;
584 char buf[2];
585
586 if (!*lenp || *ppos) {
587 *lenp = 0;
588 return 0;
589 }
590 if (!write) {
591 strncpy(buf, topology_is_enabled() ? "1\n" : "0\n",
592 ARRAY_SIZE(buf));
593 len = strnlen(buf, ARRAY_SIZE(buf));
594 if (len > *lenp)
595 len = *lenp;
596 if (copy_to_user(buffer, buf, len))
597 return -EFAULT;
598 goto out;
599 }
600 len = *lenp;
601 if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
602 return -EFAULT;
603 if (buf[0] != '0' && buf[0] != '1')
604 return -EINVAL;
605 mutex_lock(&smp_cpu_state_mutex);
606 new_mode = topology_get_mode(buf[0] == '1');
607 if (topology_mode != new_mode) {
608 topology_mode = new_mode;
609 topology_schedule_update();
610 }
611 mutex_unlock(&smp_cpu_state_mutex);
612 topology_flush_work();
613out:
614 *lenp = len;
615 *ppos += len;
616 return 0;
617}
618
619static struct ctl_table topology_ctl_table[] = {
620 {
621 .procname = "topology",
622 .mode = 0644,
623 .proc_handler = topology_ctl_handler,
624 },
625 { },
626};
627
628static struct ctl_table topology_dir_table[] = {
629 {
630 .procname = "s390",
631 .maxlen = 0,
632 .mode = 0555,
633 .child = topology_ctl_table,
634 },
635 { },
636};
637
638static int __init topology_init(void)
639{
640 timer_setup(&topology_timer, topology_timer_fn, TIMER_DEFERRABLE);
641 if (MACHINE_HAS_TOPOLOGY)
642 set_topology_timer();
643 else
644 topology_update_polarization_simple();
645 register_sysctl_table(topology_dir_table);
646 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
647}
648device_initcall(topology_init);
1/*
2 * Copyright IBM Corp. 2007, 2011
3 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
4 */
5
6#define KMSG_COMPONENT "cpu"
7#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
8
9#include <linux/workqueue.h>
10#include <linux/bootmem.h>
11#include <linux/cpuset.h>
12#include <linux/device.h>
13#include <linux/export.h>
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/cpu.h>
19#include <linux/smp.h>
20#include <linux/mm.h>
21#include <asm/sysinfo.h>
22
23#define PTF_HORIZONTAL (0UL)
24#define PTF_VERTICAL (1UL)
25#define PTF_CHECK (2UL)
26
27struct mask_info {
28 struct mask_info *next;
29 unsigned char id;
30 cpumask_t mask;
31};
32
33static void set_topology_timer(void);
34static void topology_work_fn(struct work_struct *work);
35static struct sysinfo_15_1_x *tl_info;
36
37static int topology_enabled = 1;
38static DECLARE_WORK(topology_work, topology_work_fn);
39
40/* topology_lock protects the socket and book linked lists */
41static DEFINE_SPINLOCK(topology_lock);
42static struct mask_info socket_info;
43static struct mask_info book_info;
44
45struct cpu_topology_s390 cpu_topology[NR_CPUS];
46EXPORT_SYMBOL_GPL(cpu_topology);
47
48static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
49{
50 cpumask_t mask;
51
52 cpumask_copy(&mask, cpumask_of(cpu));
53 if (!topology_enabled || !MACHINE_HAS_TOPOLOGY)
54 return mask;
55 for (; info; info = info->next) {
56 if (cpumask_test_cpu(cpu, &info->mask))
57 return info->mask;
58 }
59 return mask;
60}
61
62static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu,
63 struct mask_info *book,
64 struct mask_info *socket,
65 int one_socket_per_cpu)
66{
67 unsigned int cpu;
68
69 for_each_set_bit(cpu, &tl_cpu->mask[0], TOPOLOGY_CPU_BITS) {
70 unsigned int rcpu;
71 int lcpu;
72
73 rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin;
74 lcpu = smp_find_processor_id(rcpu);
75 if (lcpu < 0)
76 continue;
77 cpumask_set_cpu(lcpu, &book->mask);
78 cpu_topology[lcpu].book_id = book->id;
79 cpumask_set_cpu(lcpu, &socket->mask);
80 cpu_topology[lcpu].core_id = rcpu;
81 if (one_socket_per_cpu) {
82 cpu_topology[lcpu].socket_id = rcpu;
83 socket = socket->next;
84 } else {
85 cpu_topology[lcpu].socket_id = socket->id;
86 }
87 smp_cpu_set_polarization(lcpu, tl_cpu->pp);
88 }
89 return socket;
90}
91
92static void clear_masks(void)
93{
94 struct mask_info *info;
95
96 info = &socket_info;
97 while (info) {
98 cpumask_clear(&info->mask);
99 info = info->next;
100 }
101 info = &book_info;
102 while (info) {
103 cpumask_clear(&info->mask);
104 info = info->next;
105 }
106}
107
108static union topology_entry *next_tle(union topology_entry *tle)
109{
110 if (!tle->nl)
111 return (union topology_entry *)((struct topology_cpu *)tle + 1);
112 return (union topology_entry *)((struct topology_container *)tle + 1);
113}
114
115static void __tl_to_masks_generic(struct sysinfo_15_1_x *info)
116{
117 struct mask_info *socket = &socket_info;
118 struct mask_info *book = &book_info;
119 union topology_entry *tle, *end;
120
121 tle = info->tle;
122 end = (union topology_entry *)((unsigned long)info + info->length);
123 while (tle < end) {
124 switch (tle->nl) {
125 case 2:
126 book = book->next;
127 book->id = tle->container.id;
128 break;
129 case 1:
130 socket = socket->next;
131 socket->id = tle->container.id;
132 break;
133 case 0:
134 add_cpus_to_mask(&tle->cpu, book, socket, 0);
135 break;
136 default:
137 clear_masks();
138 return;
139 }
140 tle = next_tle(tle);
141 }
142}
143
144static void __tl_to_masks_z10(struct sysinfo_15_1_x *info)
145{
146 struct mask_info *socket = &socket_info;
147 struct mask_info *book = &book_info;
148 union topology_entry *tle, *end;
149
150 tle = info->tle;
151 end = (union topology_entry *)((unsigned long)info + info->length);
152 while (tle < end) {
153 switch (tle->nl) {
154 case 1:
155 book = book->next;
156 book->id = tle->container.id;
157 break;
158 case 0:
159 socket = add_cpus_to_mask(&tle->cpu, book, socket, 1);
160 break;
161 default:
162 clear_masks();
163 return;
164 }
165 tle = next_tle(tle);
166 }
167}
168
169static void tl_to_masks(struct sysinfo_15_1_x *info)
170{
171 struct cpuid cpu_id;
172
173 spin_lock_irq(&topology_lock);
174 get_cpu_id(&cpu_id);
175 clear_masks();
176 switch (cpu_id.machine) {
177 case 0x2097:
178 case 0x2098:
179 __tl_to_masks_z10(info);
180 break;
181 default:
182 __tl_to_masks_generic(info);
183 }
184 spin_unlock_irq(&topology_lock);
185}
186
187static void topology_update_polarization_simple(void)
188{
189 int cpu;
190
191 mutex_lock(&smp_cpu_state_mutex);
192 for_each_possible_cpu(cpu)
193 smp_cpu_set_polarization(cpu, POLARIZATION_HRZ);
194 mutex_unlock(&smp_cpu_state_mutex);
195}
196
197static int ptf(unsigned long fc)
198{
199 int rc;
200
201 asm volatile(
202 " .insn rre,0xb9a20000,%1,%1\n"
203 " ipm %0\n"
204 " srl %0,28\n"
205 : "=d" (rc)
206 : "d" (fc) : "cc");
207 return rc;
208}
209
210int topology_set_cpu_management(int fc)
211{
212 int cpu, rc;
213
214 if (!MACHINE_HAS_TOPOLOGY)
215 return -EOPNOTSUPP;
216 if (fc)
217 rc = ptf(PTF_VERTICAL);
218 else
219 rc = ptf(PTF_HORIZONTAL);
220 if (rc)
221 return -EBUSY;
222 for_each_possible_cpu(cpu)
223 smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
224 return rc;
225}
226
227static void update_cpu_masks(void)
228{
229 unsigned long flags;
230 int cpu;
231
232 spin_lock_irqsave(&topology_lock, flags);
233 for_each_possible_cpu(cpu) {
234 cpu_topology[cpu].core_mask = cpu_group_map(&socket_info, cpu);
235 cpu_topology[cpu].book_mask = cpu_group_map(&book_info, cpu);
236 if (!MACHINE_HAS_TOPOLOGY) {
237 cpu_topology[cpu].core_id = cpu;
238 cpu_topology[cpu].socket_id = cpu;
239 cpu_topology[cpu].book_id = cpu;
240 }
241 }
242 spin_unlock_irqrestore(&topology_lock, flags);
243}
244
245void store_topology(struct sysinfo_15_1_x *info)
246{
247 if (topology_max_mnest >= 3)
248 stsi(info, 15, 1, 3);
249 else
250 stsi(info, 15, 1, 2);
251}
252
253int arch_update_cpu_topology(void)
254{
255 struct sysinfo_15_1_x *info = tl_info;
256 struct device *dev;
257 int cpu;
258
259 if (!MACHINE_HAS_TOPOLOGY) {
260 update_cpu_masks();
261 topology_update_polarization_simple();
262 return 0;
263 }
264 store_topology(info);
265 tl_to_masks(info);
266 update_cpu_masks();
267 for_each_online_cpu(cpu) {
268 dev = get_cpu_device(cpu);
269 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
270 }
271 return 1;
272}
273
274static void topology_work_fn(struct work_struct *work)
275{
276 rebuild_sched_domains();
277}
278
279void topology_schedule_update(void)
280{
281 schedule_work(&topology_work);
282}
283
284static void topology_timer_fn(unsigned long ignored)
285{
286 if (ptf(PTF_CHECK))
287 topology_schedule_update();
288 set_topology_timer();
289}
290
291static struct timer_list topology_timer =
292 TIMER_DEFERRED_INITIALIZER(topology_timer_fn, 0, 0);
293
294static atomic_t topology_poll = ATOMIC_INIT(0);
295
296static void set_topology_timer(void)
297{
298 if (atomic_add_unless(&topology_poll, -1, 0))
299 mod_timer(&topology_timer, jiffies + HZ / 10);
300 else
301 mod_timer(&topology_timer, jiffies + HZ * 60);
302}
303
304void topology_expect_change(void)
305{
306 if (!MACHINE_HAS_TOPOLOGY)
307 return;
308 /* This is racy, but it doesn't matter since it is just a heuristic.
309 * Worst case is that we poll in a higher frequency for a bit longer.
310 */
311 if (atomic_read(&topology_poll) > 60)
312 return;
313 atomic_add(60, &topology_poll);
314 set_topology_timer();
315}
316
317static int __init early_parse_topology(char *p)
318{
319 if (strncmp(p, "off", 3))
320 return 0;
321 topology_enabled = 0;
322 return 0;
323}
324early_param("topology", early_parse_topology);
325
326static void __init alloc_masks(struct sysinfo_15_1_x *info,
327 struct mask_info *mask, int offset)
328{
329 int i, nr_masks;
330
331 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
332 for (i = 0; i < info->mnest - offset; i++)
333 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
334 nr_masks = max(nr_masks, 1);
335 for (i = 0; i < nr_masks; i++) {
336 mask->next = alloc_bootmem(sizeof(struct mask_info));
337 mask = mask->next;
338 }
339}
340
341void __init s390_init_cpu_topology(void)
342{
343 struct sysinfo_15_1_x *info;
344 int i;
345
346 if (!MACHINE_HAS_TOPOLOGY)
347 return;
348 tl_info = alloc_bootmem_pages(PAGE_SIZE);
349 info = tl_info;
350 store_topology(info);
351 pr_info("The CPU configuration topology of the machine is:");
352 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
353 printk(KERN_CONT " %d", info->mag[i]);
354 printk(KERN_CONT " / %d\n", info->mnest);
355 alloc_masks(info, &socket_info, 1);
356 alloc_masks(info, &book_info, 2);
357}
358
359static int cpu_management;
360
361static ssize_t dispatching_show(struct device *dev,
362 struct device_attribute *attr,
363 char *buf)
364{
365 ssize_t count;
366
367 mutex_lock(&smp_cpu_state_mutex);
368 count = sprintf(buf, "%d\n", cpu_management);
369 mutex_unlock(&smp_cpu_state_mutex);
370 return count;
371}
372
373static ssize_t dispatching_store(struct device *dev,
374 struct device_attribute *attr,
375 const char *buf,
376 size_t count)
377{
378 int val, rc;
379 char delim;
380
381 if (sscanf(buf, "%d %c", &val, &delim) != 1)
382 return -EINVAL;
383 if (val != 0 && val != 1)
384 return -EINVAL;
385 rc = 0;
386 get_online_cpus();
387 mutex_lock(&smp_cpu_state_mutex);
388 if (cpu_management == val)
389 goto out;
390 rc = topology_set_cpu_management(val);
391 if (rc)
392 goto out;
393 cpu_management = val;
394 topology_expect_change();
395out:
396 mutex_unlock(&smp_cpu_state_mutex);
397 put_online_cpus();
398 return rc ? rc : count;
399}
400static DEVICE_ATTR(dispatching, 0644, dispatching_show,
401 dispatching_store);
402
403static ssize_t cpu_polarization_show(struct device *dev,
404 struct device_attribute *attr, char *buf)
405{
406 int cpu = dev->id;
407 ssize_t count;
408
409 mutex_lock(&smp_cpu_state_mutex);
410 switch (smp_cpu_get_polarization(cpu)) {
411 case POLARIZATION_HRZ:
412 count = sprintf(buf, "horizontal\n");
413 break;
414 case POLARIZATION_VL:
415 count = sprintf(buf, "vertical:low\n");
416 break;
417 case POLARIZATION_VM:
418 count = sprintf(buf, "vertical:medium\n");
419 break;
420 case POLARIZATION_VH:
421 count = sprintf(buf, "vertical:high\n");
422 break;
423 default:
424 count = sprintf(buf, "unknown\n");
425 break;
426 }
427 mutex_unlock(&smp_cpu_state_mutex);
428 return count;
429}
430static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
431
432static struct attribute *topology_cpu_attrs[] = {
433 &dev_attr_polarization.attr,
434 NULL,
435};
436
437static struct attribute_group topology_cpu_attr_group = {
438 .attrs = topology_cpu_attrs,
439};
440
441int topology_cpu_init(struct cpu *cpu)
442{
443 return sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
444}
445
446static int __init topology_init(void)
447{
448 if (!MACHINE_HAS_TOPOLOGY) {
449 topology_update_polarization_simple();
450 goto out;
451 }
452 set_topology_timer();
453out:
454 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
455}
456device_initcall(topology_init);