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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/memblock.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 if (dev)
315 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
316 }
317 return rc;
318}
319
320static void topology_work_fn(struct work_struct *work)
321{
322 rebuild_sched_domains();
323}
324
325void topology_schedule_update(void)
326{
327 schedule_work(&topology_work);
328}
329
330static void topology_flush_work(void)
331{
332 flush_work(&topology_work);
333}
334
335static void topology_timer_fn(struct timer_list *unused)
336{
337 if (ptf(PTF_CHECK))
338 topology_schedule_update();
339 set_topology_timer();
340}
341
342static struct timer_list topology_timer;
343
344static atomic_t topology_poll = ATOMIC_INIT(0);
345
346static void set_topology_timer(void)
347{
348 if (atomic_add_unless(&topology_poll, -1, 0))
349 mod_timer(&topology_timer, jiffies + HZ / 10);
350 else
351 mod_timer(&topology_timer, jiffies + HZ * 60);
352}
353
354void topology_expect_change(void)
355{
356 if (!MACHINE_HAS_TOPOLOGY)
357 return;
358 /* This is racy, but it doesn't matter since it is just a heuristic.
359 * Worst case is that we poll in a higher frequency for a bit longer.
360 */
361 if (atomic_read(&topology_poll) > 60)
362 return;
363 atomic_add(60, &topology_poll);
364 set_topology_timer();
365}
366
367static int cpu_management;
368
369static ssize_t dispatching_show(struct device *dev,
370 struct device_attribute *attr,
371 char *buf)
372{
373 ssize_t count;
374
375 mutex_lock(&smp_cpu_state_mutex);
376 count = sprintf(buf, "%d\n", cpu_management);
377 mutex_unlock(&smp_cpu_state_mutex);
378 return count;
379}
380
381static ssize_t dispatching_store(struct device *dev,
382 struct device_attribute *attr,
383 const char *buf,
384 size_t count)
385{
386 int val, rc;
387 char delim;
388
389 if (sscanf(buf, "%d %c", &val, &delim) != 1)
390 return -EINVAL;
391 if (val != 0 && val != 1)
392 return -EINVAL;
393 rc = 0;
394 get_online_cpus();
395 mutex_lock(&smp_cpu_state_mutex);
396 if (cpu_management == val)
397 goto out;
398 rc = topology_set_cpu_management(val);
399 if (rc)
400 goto out;
401 cpu_management = val;
402 topology_expect_change();
403out:
404 mutex_unlock(&smp_cpu_state_mutex);
405 put_online_cpus();
406 return rc ? rc : count;
407}
408static DEVICE_ATTR_RW(dispatching);
409
410static ssize_t cpu_polarization_show(struct device *dev,
411 struct device_attribute *attr, char *buf)
412{
413 int cpu = dev->id;
414 ssize_t count;
415
416 mutex_lock(&smp_cpu_state_mutex);
417 switch (smp_cpu_get_polarization(cpu)) {
418 case POLARIZATION_HRZ:
419 count = sprintf(buf, "horizontal\n");
420 break;
421 case POLARIZATION_VL:
422 count = sprintf(buf, "vertical:low\n");
423 break;
424 case POLARIZATION_VM:
425 count = sprintf(buf, "vertical:medium\n");
426 break;
427 case POLARIZATION_VH:
428 count = sprintf(buf, "vertical:high\n");
429 break;
430 default:
431 count = sprintf(buf, "unknown\n");
432 break;
433 }
434 mutex_unlock(&smp_cpu_state_mutex);
435 return count;
436}
437static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
438
439static struct attribute *topology_cpu_attrs[] = {
440 &dev_attr_polarization.attr,
441 NULL,
442};
443
444static struct attribute_group topology_cpu_attr_group = {
445 .attrs = topology_cpu_attrs,
446};
447
448static ssize_t cpu_dedicated_show(struct device *dev,
449 struct device_attribute *attr, char *buf)
450{
451 int cpu = dev->id;
452 ssize_t count;
453
454 mutex_lock(&smp_cpu_state_mutex);
455 count = sprintf(buf, "%d\n", topology_cpu_dedicated(cpu));
456 mutex_unlock(&smp_cpu_state_mutex);
457 return count;
458}
459static DEVICE_ATTR(dedicated, 0444, cpu_dedicated_show, NULL);
460
461static struct attribute *topology_extra_cpu_attrs[] = {
462 &dev_attr_dedicated.attr,
463 NULL,
464};
465
466static struct attribute_group topology_extra_cpu_attr_group = {
467 .attrs = topology_extra_cpu_attrs,
468};
469
470int topology_cpu_init(struct cpu *cpu)
471{
472 int rc;
473
474 rc = sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
475 if (rc || !MACHINE_HAS_TOPOLOGY)
476 return rc;
477 rc = sysfs_create_group(&cpu->dev.kobj, &topology_extra_cpu_attr_group);
478 if (rc)
479 sysfs_remove_group(&cpu->dev.kobj, &topology_cpu_attr_group);
480 return rc;
481}
482
483static const struct cpumask *cpu_thread_mask(int cpu)
484{
485 return &cpu_topology[cpu].thread_mask;
486}
487
488
489const struct cpumask *cpu_coregroup_mask(int cpu)
490{
491 return &cpu_topology[cpu].core_mask;
492}
493
494static const struct cpumask *cpu_book_mask(int cpu)
495{
496 return &cpu_topology[cpu].book_mask;
497}
498
499static const struct cpumask *cpu_drawer_mask(int cpu)
500{
501 return &cpu_topology[cpu].drawer_mask;
502}
503
504static struct sched_domain_topology_level s390_topology[] = {
505 { cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
506 { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
507 { cpu_book_mask, SD_INIT_NAME(BOOK) },
508 { cpu_drawer_mask, SD_INIT_NAME(DRAWER) },
509 { cpu_cpu_mask, SD_INIT_NAME(DIE) },
510 { NULL, },
511};
512
513static void __init alloc_masks(struct sysinfo_15_1_x *info,
514 struct mask_info *mask, int offset)
515{
516 int i, nr_masks;
517
518 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
519 for (i = 0; i < info->mnest - offset; i++)
520 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
521 nr_masks = max(nr_masks, 1);
522 for (i = 0; i < nr_masks; i++) {
523 mask->next = memblock_alloc(sizeof(*mask->next), 8);
524 if (!mask->next)
525 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
526 __func__, sizeof(*mask->next), 8);
527 mask = mask->next;
528 }
529}
530
531void __init topology_init_early(void)
532{
533 struct sysinfo_15_1_x *info;
534
535 set_sched_topology(s390_topology);
536 if (topology_mode == TOPOLOGY_MODE_UNINITIALIZED) {
537 if (MACHINE_HAS_TOPOLOGY)
538 topology_mode = TOPOLOGY_MODE_HW;
539 else
540 topology_mode = TOPOLOGY_MODE_SINGLE;
541 }
542 if (!MACHINE_HAS_TOPOLOGY)
543 goto out;
544 tl_info = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
545 if (!tl_info)
546 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
547 __func__, PAGE_SIZE, PAGE_SIZE);
548 info = tl_info;
549 store_topology(info);
550 pr_info("The CPU configuration topology of the machine is: %d %d %d %d %d %d / %d\n",
551 info->mag[0], info->mag[1], info->mag[2], info->mag[3],
552 info->mag[4], info->mag[5], info->mnest);
553 alloc_masks(info, &socket_info, 1);
554 alloc_masks(info, &book_info, 2);
555 alloc_masks(info, &drawer_info, 3);
556out:
557 __arch_update_cpu_topology();
558 __arch_update_dedicated_flag(NULL);
559}
560
561static inline int topology_get_mode(int enabled)
562{
563 if (!enabled)
564 return TOPOLOGY_MODE_SINGLE;
565 return MACHINE_HAS_TOPOLOGY ? TOPOLOGY_MODE_HW : TOPOLOGY_MODE_PACKAGE;
566}
567
568static inline int topology_is_enabled(void)
569{
570 return topology_mode != TOPOLOGY_MODE_SINGLE;
571}
572
573static int __init topology_setup(char *str)
574{
575 bool enabled;
576 int rc;
577
578 rc = kstrtobool(str, &enabled);
579 if (rc)
580 return rc;
581 topology_mode = topology_get_mode(enabled);
582 return 0;
583}
584early_param("topology", topology_setup);
585
586static int topology_ctl_handler(struct ctl_table *ctl, int write,
587 void __user *buffer, size_t *lenp, loff_t *ppos)
588{
589 int enabled = topology_is_enabled();
590 int new_mode;
591 int rc;
592 struct ctl_table ctl_entry = {
593 .procname = ctl->procname,
594 .data = &enabled,
595 .maxlen = sizeof(int),
596 .extra1 = SYSCTL_ZERO,
597 .extra2 = SYSCTL_ONE,
598 };
599
600 rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
601 if (rc < 0 || !write)
602 return rc;
603
604 mutex_lock(&smp_cpu_state_mutex);
605 new_mode = topology_get_mode(enabled);
606 if (topology_mode != new_mode) {
607 topology_mode = new_mode;
608 topology_schedule_update();
609 }
610 mutex_unlock(&smp_cpu_state_mutex);
611 topology_flush_work();
612
613 return rc;
614}
615
616static struct ctl_table topology_ctl_table[] = {
617 {
618 .procname = "topology",
619 .mode = 0644,
620 .proc_handler = topology_ctl_handler,
621 },
622 { },
623};
624
625static struct ctl_table topology_dir_table[] = {
626 {
627 .procname = "s390",
628 .maxlen = 0,
629 .mode = 0555,
630 .child = topology_ctl_table,
631 },
632 { },
633};
634
635static int __init topology_init(void)
636{
637 timer_setup(&topology_timer, topology_timer_fn, TIMER_DEFERRABLE);
638 if (MACHINE_HAS_TOPOLOGY)
639 set_topology_timer();
640 else
641 topology_update_polarization_simple();
642 register_sysctl_table(topology_dir_table);
643 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
644}
645device_initcall(topology_init);
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/memblock.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
30#define PTF_HORIZONTAL (0UL)
31#define PTF_VERTICAL (1UL)
32#define PTF_CHECK (2UL)
33
34enum {
35 TOPOLOGY_MODE_HW,
36 TOPOLOGY_MODE_SINGLE,
37 TOPOLOGY_MODE_PACKAGE,
38 TOPOLOGY_MODE_UNINITIALIZED
39};
40
41struct mask_info {
42 struct mask_info *next;
43 unsigned char id;
44 cpumask_t mask;
45};
46
47static int topology_mode = TOPOLOGY_MODE_UNINITIALIZED;
48static void set_topology_timer(void);
49static void topology_work_fn(struct work_struct *work);
50static struct sysinfo_15_1_x *tl_info;
51
52static DECLARE_WORK(topology_work, topology_work_fn);
53
54/*
55 * Socket/Book linked lists and cpu_topology updates are
56 * protected by "sched_domains_mutex".
57 */
58static struct mask_info socket_info;
59static struct mask_info book_info;
60static struct mask_info drawer_info;
61
62struct cpu_topology_s390 cpu_topology[NR_CPUS];
63EXPORT_SYMBOL_GPL(cpu_topology);
64
65static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
66{
67 cpumask_t mask;
68
69 cpumask_copy(&mask, cpumask_of(cpu));
70 switch (topology_mode) {
71 case TOPOLOGY_MODE_HW:
72 while (info) {
73 if (cpumask_test_cpu(cpu, &info->mask)) {
74 mask = info->mask;
75 break;
76 }
77 info = info->next;
78 }
79 if (cpumask_empty(&mask))
80 cpumask_copy(&mask, cpumask_of(cpu));
81 break;
82 case TOPOLOGY_MODE_PACKAGE:
83 cpumask_copy(&mask, cpu_present_mask);
84 break;
85 default:
86 fallthrough;
87 case TOPOLOGY_MODE_SINGLE:
88 cpumask_copy(&mask, cpumask_of(cpu));
89 break;
90 }
91 cpumask_and(&mask, &mask, cpu_online_mask);
92 return mask;
93}
94
95static cpumask_t cpu_thread_map(unsigned int cpu)
96{
97 cpumask_t mask;
98 int i;
99
100 cpumask_copy(&mask, cpumask_of(cpu));
101 if (topology_mode != TOPOLOGY_MODE_HW)
102 return mask;
103 cpu -= cpu % (smp_cpu_mtid + 1);
104 for (i = 0; i <= smp_cpu_mtid; i++)
105 if (cpu_present(cpu + i))
106 cpumask_set_cpu(cpu + i, &mask);
107 cpumask_and(&mask, &mask, cpu_online_mask);
108 return mask;
109}
110
111#define TOPOLOGY_CORE_BITS 64
112
113static void add_cpus_to_mask(struct topology_core *tl_core,
114 struct mask_info *drawer,
115 struct mask_info *book,
116 struct mask_info *socket)
117{
118 struct cpu_topology_s390 *topo;
119 unsigned int core;
120
121 for_each_set_bit(core, &tl_core->mask, TOPOLOGY_CORE_BITS) {
122 unsigned int rcore;
123 int lcpu, i;
124
125 rcore = TOPOLOGY_CORE_BITS - 1 - core + tl_core->origin;
126 lcpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
127 if (lcpu < 0)
128 continue;
129 for (i = 0; i <= smp_cpu_mtid; i++) {
130 topo = &cpu_topology[lcpu + i];
131 topo->drawer_id = drawer->id;
132 topo->book_id = book->id;
133 topo->socket_id = socket->id;
134 topo->core_id = rcore;
135 topo->thread_id = lcpu + i;
136 topo->dedicated = tl_core->d;
137 cpumask_set_cpu(lcpu + i, &drawer->mask);
138 cpumask_set_cpu(lcpu + i, &book->mask);
139 cpumask_set_cpu(lcpu + i, &socket->mask);
140 smp_cpu_set_polarization(lcpu + i, tl_core->pp);
141 }
142 }
143}
144
145static void clear_masks(void)
146{
147 struct mask_info *info;
148
149 info = &socket_info;
150 while (info) {
151 cpumask_clear(&info->mask);
152 info = info->next;
153 }
154 info = &book_info;
155 while (info) {
156 cpumask_clear(&info->mask);
157 info = info->next;
158 }
159 info = &drawer_info;
160 while (info) {
161 cpumask_clear(&info->mask);
162 info = info->next;
163 }
164}
165
166static union topology_entry *next_tle(union topology_entry *tle)
167{
168 if (!tle->nl)
169 return (union topology_entry *)((struct topology_core *)tle + 1);
170 return (union topology_entry *)((struct topology_container *)tle + 1);
171}
172
173static void tl_to_masks(struct sysinfo_15_1_x *info)
174{
175 struct mask_info *socket = &socket_info;
176 struct mask_info *book = &book_info;
177 struct mask_info *drawer = &drawer_info;
178 union topology_entry *tle, *end;
179
180 clear_masks();
181 tle = info->tle;
182 end = (union topology_entry *)((unsigned long)info + info->length);
183 while (tle < end) {
184 switch (tle->nl) {
185 case 3:
186 drawer = drawer->next;
187 drawer->id = tle->container.id;
188 break;
189 case 2:
190 book = book->next;
191 book->id = tle->container.id;
192 break;
193 case 1:
194 socket = socket->next;
195 socket->id = tle->container.id;
196 break;
197 case 0:
198 add_cpus_to_mask(&tle->cpu, drawer, book, socket);
199 break;
200 default:
201 clear_masks();
202 return;
203 }
204 tle = next_tle(tle);
205 }
206}
207
208static void topology_update_polarization_simple(void)
209{
210 int cpu;
211
212 for_each_possible_cpu(cpu)
213 smp_cpu_set_polarization(cpu, POLARIZATION_HRZ);
214}
215
216static int ptf(unsigned long fc)
217{
218 int rc;
219
220 asm volatile(
221 " .insn rre,0xb9a20000,%1,%1\n"
222 " ipm %0\n"
223 " srl %0,28\n"
224 : "=d" (rc)
225 : "d" (fc) : "cc");
226 return rc;
227}
228
229int topology_set_cpu_management(int fc)
230{
231 int cpu, rc;
232
233 if (!MACHINE_HAS_TOPOLOGY)
234 return -EOPNOTSUPP;
235 if (fc)
236 rc = ptf(PTF_VERTICAL);
237 else
238 rc = ptf(PTF_HORIZONTAL);
239 if (rc)
240 return -EBUSY;
241 for_each_possible_cpu(cpu)
242 smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
243 return rc;
244}
245
246void update_cpu_masks(void)
247{
248 struct cpu_topology_s390 *topo, *topo_package, *topo_sibling;
249 int cpu, sibling, pkg_first, smt_first, id;
250
251 for_each_possible_cpu(cpu) {
252 topo = &cpu_topology[cpu];
253 topo->thread_mask = cpu_thread_map(cpu);
254 topo->core_mask = cpu_group_map(&socket_info, cpu);
255 topo->book_mask = cpu_group_map(&book_info, cpu);
256 topo->drawer_mask = cpu_group_map(&drawer_info, cpu);
257 topo->booted_cores = 0;
258 if (topology_mode != TOPOLOGY_MODE_HW) {
259 id = topology_mode == TOPOLOGY_MODE_PACKAGE ? 0 : cpu;
260 topo->thread_id = cpu;
261 topo->core_id = cpu;
262 topo->socket_id = id;
263 topo->book_id = id;
264 topo->drawer_id = id;
265 }
266 }
267 for_each_online_cpu(cpu) {
268 topo = &cpu_topology[cpu];
269 pkg_first = cpumask_first(&topo->core_mask);
270 topo_package = &cpu_topology[pkg_first];
271 if (cpu == pkg_first) {
272 for_each_cpu(sibling, &topo->core_mask) {
273 topo_sibling = &cpu_topology[sibling];
274 smt_first = cpumask_first(&topo_sibling->thread_mask);
275 if (sibling == smt_first)
276 topo_package->booted_cores++;
277 }
278 } else {
279 topo->booted_cores = topo_package->booted_cores;
280 }
281 }
282}
283
284void store_topology(struct sysinfo_15_1_x *info)
285{
286 stsi(info, 15, 1, topology_mnest_limit());
287}
288
289static void __arch_update_dedicated_flag(void *arg)
290{
291 if (topology_cpu_dedicated(smp_processor_id()))
292 set_cpu_flag(CIF_DEDICATED_CPU);
293 else
294 clear_cpu_flag(CIF_DEDICATED_CPU);
295}
296
297static int __arch_update_cpu_topology(void)
298{
299 struct sysinfo_15_1_x *info = tl_info;
300 int rc = 0;
301
302 mutex_lock(&smp_cpu_state_mutex);
303 if (MACHINE_HAS_TOPOLOGY) {
304 rc = 1;
305 store_topology(info);
306 tl_to_masks(info);
307 }
308 update_cpu_masks();
309 if (!MACHINE_HAS_TOPOLOGY)
310 topology_update_polarization_simple();
311 mutex_unlock(&smp_cpu_state_mutex);
312 return rc;
313}
314
315int arch_update_cpu_topology(void)
316{
317 struct device *dev;
318 int cpu, rc;
319
320 rc = __arch_update_cpu_topology();
321 on_each_cpu(__arch_update_dedicated_flag, NULL, 0);
322 for_each_online_cpu(cpu) {
323 dev = get_cpu_device(cpu);
324 if (dev)
325 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
326 }
327 return rc;
328}
329
330static void topology_work_fn(struct work_struct *work)
331{
332 rebuild_sched_domains();
333}
334
335void topology_schedule_update(void)
336{
337 schedule_work(&topology_work);
338}
339
340static void topology_flush_work(void)
341{
342 flush_work(&topology_work);
343}
344
345static void topology_timer_fn(struct timer_list *unused)
346{
347 if (ptf(PTF_CHECK))
348 topology_schedule_update();
349 set_topology_timer();
350}
351
352static struct timer_list topology_timer;
353
354static atomic_t topology_poll = ATOMIC_INIT(0);
355
356static void set_topology_timer(void)
357{
358 if (atomic_add_unless(&topology_poll, -1, 0))
359 mod_timer(&topology_timer, jiffies + msecs_to_jiffies(100));
360 else
361 mod_timer(&topology_timer, jiffies + msecs_to_jiffies(60 * MSEC_PER_SEC));
362}
363
364void topology_expect_change(void)
365{
366 if (!MACHINE_HAS_TOPOLOGY)
367 return;
368 /* This is racy, but it doesn't matter since it is just a heuristic.
369 * Worst case is that we poll in a higher frequency for a bit longer.
370 */
371 if (atomic_read(&topology_poll) > 60)
372 return;
373 atomic_add(60, &topology_poll);
374 set_topology_timer();
375}
376
377static int cpu_management;
378
379static ssize_t dispatching_show(struct device *dev,
380 struct device_attribute *attr,
381 char *buf)
382{
383 ssize_t count;
384
385 mutex_lock(&smp_cpu_state_mutex);
386 count = sprintf(buf, "%d\n", cpu_management);
387 mutex_unlock(&smp_cpu_state_mutex);
388 return count;
389}
390
391static ssize_t dispatching_store(struct device *dev,
392 struct device_attribute *attr,
393 const char *buf,
394 size_t count)
395{
396 int val, rc;
397 char delim;
398
399 if (sscanf(buf, "%d %c", &val, &delim) != 1)
400 return -EINVAL;
401 if (val != 0 && val != 1)
402 return -EINVAL;
403 rc = 0;
404 get_online_cpus();
405 mutex_lock(&smp_cpu_state_mutex);
406 if (cpu_management == val)
407 goto out;
408 rc = topology_set_cpu_management(val);
409 if (rc)
410 goto out;
411 cpu_management = val;
412 topology_expect_change();
413out:
414 mutex_unlock(&smp_cpu_state_mutex);
415 put_online_cpus();
416 return rc ? rc : count;
417}
418static DEVICE_ATTR_RW(dispatching);
419
420static ssize_t cpu_polarization_show(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
423 int cpu = dev->id;
424 ssize_t count;
425
426 mutex_lock(&smp_cpu_state_mutex);
427 switch (smp_cpu_get_polarization(cpu)) {
428 case POLARIZATION_HRZ:
429 count = sprintf(buf, "horizontal\n");
430 break;
431 case POLARIZATION_VL:
432 count = sprintf(buf, "vertical:low\n");
433 break;
434 case POLARIZATION_VM:
435 count = sprintf(buf, "vertical:medium\n");
436 break;
437 case POLARIZATION_VH:
438 count = sprintf(buf, "vertical:high\n");
439 break;
440 default:
441 count = sprintf(buf, "unknown\n");
442 break;
443 }
444 mutex_unlock(&smp_cpu_state_mutex);
445 return count;
446}
447static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
448
449static struct attribute *topology_cpu_attrs[] = {
450 &dev_attr_polarization.attr,
451 NULL,
452};
453
454static struct attribute_group topology_cpu_attr_group = {
455 .attrs = topology_cpu_attrs,
456};
457
458static ssize_t cpu_dedicated_show(struct device *dev,
459 struct device_attribute *attr, char *buf)
460{
461 int cpu = dev->id;
462 ssize_t count;
463
464 mutex_lock(&smp_cpu_state_mutex);
465 count = sprintf(buf, "%d\n", topology_cpu_dedicated(cpu));
466 mutex_unlock(&smp_cpu_state_mutex);
467 return count;
468}
469static DEVICE_ATTR(dedicated, 0444, cpu_dedicated_show, NULL);
470
471static struct attribute *topology_extra_cpu_attrs[] = {
472 &dev_attr_dedicated.attr,
473 NULL,
474};
475
476static struct attribute_group topology_extra_cpu_attr_group = {
477 .attrs = topology_extra_cpu_attrs,
478};
479
480int topology_cpu_init(struct cpu *cpu)
481{
482 int rc;
483
484 rc = sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
485 if (rc || !MACHINE_HAS_TOPOLOGY)
486 return rc;
487 rc = sysfs_create_group(&cpu->dev.kobj, &topology_extra_cpu_attr_group);
488 if (rc)
489 sysfs_remove_group(&cpu->dev.kobj, &topology_cpu_attr_group);
490 return rc;
491}
492
493static const struct cpumask *cpu_thread_mask(int cpu)
494{
495 return &cpu_topology[cpu].thread_mask;
496}
497
498
499const struct cpumask *cpu_coregroup_mask(int cpu)
500{
501 return &cpu_topology[cpu].core_mask;
502}
503
504static const struct cpumask *cpu_book_mask(int cpu)
505{
506 return &cpu_topology[cpu].book_mask;
507}
508
509static const struct cpumask *cpu_drawer_mask(int cpu)
510{
511 return &cpu_topology[cpu].drawer_mask;
512}
513
514static struct sched_domain_topology_level s390_topology[] = {
515 { cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
516 { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
517 { cpu_book_mask, SD_INIT_NAME(BOOK) },
518 { cpu_drawer_mask, SD_INIT_NAME(DRAWER) },
519 { cpu_cpu_mask, SD_INIT_NAME(DIE) },
520 { NULL, },
521};
522
523static void __init alloc_masks(struct sysinfo_15_1_x *info,
524 struct mask_info *mask, int offset)
525{
526 int i, nr_masks;
527
528 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
529 for (i = 0; i < info->mnest - offset; i++)
530 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
531 nr_masks = max(nr_masks, 1);
532 for (i = 0; i < nr_masks; i++) {
533 mask->next = memblock_alloc(sizeof(*mask->next), 8);
534 if (!mask->next)
535 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
536 __func__, sizeof(*mask->next), 8);
537 mask = mask->next;
538 }
539}
540
541void __init topology_init_early(void)
542{
543 struct sysinfo_15_1_x *info;
544
545 set_sched_topology(s390_topology);
546 if (topology_mode == TOPOLOGY_MODE_UNINITIALIZED) {
547 if (MACHINE_HAS_TOPOLOGY)
548 topology_mode = TOPOLOGY_MODE_HW;
549 else
550 topology_mode = TOPOLOGY_MODE_SINGLE;
551 }
552 if (!MACHINE_HAS_TOPOLOGY)
553 goto out;
554 tl_info = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
555 if (!tl_info)
556 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
557 __func__, PAGE_SIZE, PAGE_SIZE);
558 info = tl_info;
559 store_topology(info);
560 pr_info("The CPU configuration topology of the machine is: %d %d %d %d %d %d / %d\n",
561 info->mag[0], info->mag[1], info->mag[2], info->mag[3],
562 info->mag[4], info->mag[5], info->mnest);
563 alloc_masks(info, &socket_info, 1);
564 alloc_masks(info, &book_info, 2);
565 alloc_masks(info, &drawer_info, 3);
566out:
567 __arch_update_cpu_topology();
568 __arch_update_dedicated_flag(NULL);
569}
570
571static inline int topology_get_mode(int enabled)
572{
573 if (!enabled)
574 return TOPOLOGY_MODE_SINGLE;
575 return MACHINE_HAS_TOPOLOGY ? TOPOLOGY_MODE_HW : TOPOLOGY_MODE_PACKAGE;
576}
577
578static inline int topology_is_enabled(void)
579{
580 return topology_mode != TOPOLOGY_MODE_SINGLE;
581}
582
583static int __init topology_setup(char *str)
584{
585 bool enabled;
586 int rc;
587
588 rc = kstrtobool(str, &enabled);
589 if (rc)
590 return rc;
591 topology_mode = topology_get_mode(enabled);
592 return 0;
593}
594early_param("topology", topology_setup);
595
596static int topology_ctl_handler(struct ctl_table *ctl, int write,
597 void *buffer, size_t *lenp, loff_t *ppos)
598{
599 int enabled = topology_is_enabled();
600 int new_mode;
601 int rc;
602 struct ctl_table ctl_entry = {
603 .procname = ctl->procname,
604 .data = &enabled,
605 .maxlen = sizeof(int),
606 .extra1 = SYSCTL_ZERO,
607 .extra2 = SYSCTL_ONE,
608 };
609
610 rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
611 if (rc < 0 || !write)
612 return rc;
613
614 mutex_lock(&smp_cpu_state_mutex);
615 new_mode = topology_get_mode(enabled);
616 if (topology_mode != new_mode) {
617 topology_mode = new_mode;
618 topology_schedule_update();
619 }
620 mutex_unlock(&smp_cpu_state_mutex);
621 topology_flush_work();
622
623 return rc;
624}
625
626static struct ctl_table topology_ctl_table[] = {
627 {
628 .procname = "topology",
629 .mode = 0644,
630 .proc_handler = topology_ctl_handler,
631 },
632 { },
633};
634
635static struct ctl_table topology_dir_table[] = {
636 {
637 .procname = "s390",
638 .maxlen = 0,
639 .mode = 0555,
640 .child = topology_ctl_table,
641 },
642 { },
643};
644
645static int __init topology_init(void)
646{
647 timer_setup(&topology_timer, topology_timer_fn, TIMER_DEFERRABLE);
648 if (MACHINE_HAS_TOPOLOGY)
649 set_topology_timer();
650 else
651 topology_update_polarization_simple();
652 register_sysctl_table(topology_dir_table);
653 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
654}
655device_initcall(topology_init);