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6#define KMSG_COMPONENT "cpu"
7#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
8
9#include <linux/workqueue.h>
10#include <linux/cpuset.h>
11#include <linux/device.h>
12#include <linux/export.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/delay.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/cpu.h>
19#include <linux/smp.h>
20#include <linux/mm.h>
21#include <linux/nodemask.h>
22#include <linux/node.h>
23#include <asm/sysinfo.h>
24#include <asm/numa.h>
25
26#define PTF_HORIZONTAL (0UL)
27#define PTF_VERTICAL (1UL)
28#define PTF_CHECK (2UL)
29
30struct mask_info {
31 struct mask_info *next;
32 unsigned char id;
33 cpumask_t mask;
34};
35
36static void set_topology_timer(void);
37static void topology_work_fn(struct work_struct *work);
38static struct sysinfo_15_1_x *tl_info;
39
40static bool topology_enabled = true;
41static DECLARE_WORK(topology_work, topology_work_fn);
42
43
44
45
46
47static struct mask_info socket_info;
48static struct mask_info book_info;
49
50DEFINE_PER_CPU(struct cpu_topology_s390, cpu_topology);
51EXPORT_PER_CPU_SYMBOL_GPL(cpu_topology);
52
53static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
54{
55 cpumask_t mask;
56
57 cpumask_copy(&mask, cpumask_of(cpu));
58 if (!topology_enabled || !MACHINE_HAS_TOPOLOGY)
59 return mask;
60 for (; info; info = info->next) {
61 if (cpumask_test_cpu(cpu, &info->mask))
62 return info->mask;
63 }
64 return mask;
65}
66
67static cpumask_t cpu_thread_map(unsigned int cpu)
68{
69 cpumask_t mask;
70 int i;
71
72 cpumask_copy(&mask, cpumask_of(cpu));
73 if (!topology_enabled || !MACHINE_HAS_TOPOLOGY)
74 return mask;
75 cpu -= cpu % (smp_cpu_mtid + 1);
76 for (i = 0; i <= smp_cpu_mtid; i++)
77 if (cpu_present(cpu + i))
78 cpumask_set_cpu(cpu + i, &mask);
79 return mask;
80}
81
82static struct mask_info *add_cpus_to_mask(struct topology_core *tl_core,
83 struct mask_info *book,
84 struct mask_info *socket,
85 int one_socket_per_cpu)
86{
87 struct cpu_topology_s390 *topo;
88 unsigned int core;
89
90 for_each_set_bit(core, &tl_core->mask[0], TOPOLOGY_CORE_BITS) {
91 unsigned int rcore;
92 int lcpu, i;
93
94 rcore = TOPOLOGY_CORE_BITS - 1 - core + tl_core->origin;
95 lcpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
96 if (lcpu < 0)
97 continue;
98 for (i = 0; i <= smp_cpu_mtid; i++) {
99 topo = &per_cpu(cpu_topology, lcpu + i);
100 topo->book_id = book->id;
101 topo->core_id = rcore;
102 topo->thread_id = lcpu + i;
103 cpumask_set_cpu(lcpu + i, &book->mask);
104 cpumask_set_cpu(lcpu + i, &socket->mask);
105 if (one_socket_per_cpu)
106 topo->socket_id = rcore;
107 else
108 topo->socket_id = socket->id;
109 smp_cpu_set_polarization(lcpu + i, tl_core->pp);
110 }
111 if (one_socket_per_cpu)
112 socket = socket->next;
113 }
114 return socket;
115}
116
117static void clear_masks(void)
118{
119 struct mask_info *info;
120
121 info = &socket_info;
122 while (info) {
123 cpumask_clear(&info->mask);
124 info = info->next;
125 }
126 info = &book_info;
127 while (info) {
128 cpumask_clear(&info->mask);
129 info = info->next;
130 }
131}
132
133static union topology_entry *next_tle(union topology_entry *tle)
134{
135 if (!tle->nl)
136 return (union topology_entry *)((struct topology_core *)tle + 1);
137 return (union topology_entry *)((struct topology_container *)tle + 1);
138}
139
140static void __tl_to_masks_generic(struct sysinfo_15_1_x *info)
141{
142 struct mask_info *socket = &socket_info;
143 struct mask_info *book = &book_info;
144 union topology_entry *tle, *end;
145
146 tle = info->tle;
147 end = (union topology_entry *)((unsigned long)info + info->length);
148 while (tle < end) {
149 switch (tle->nl) {
150 case 2:
151 book = book->next;
152 book->id = tle->container.id;
153 break;
154 case 1:
155 socket = socket->next;
156 socket->id = tle->container.id;
157 break;
158 case 0:
159 add_cpus_to_mask(&tle->cpu, book, socket, 0);
160 break;
161 default:
162 clear_masks();
163 return;
164 }
165 tle = next_tle(tle);
166 }
167}
168
169static void __tl_to_masks_z10(struct sysinfo_15_1_x *info)
170{
171 struct mask_info *socket = &socket_info;
172 struct mask_info *book = &book_info;
173 union topology_entry *tle, *end;
174
175 tle = info->tle;
176 end = (union topology_entry *)((unsigned long)info + info->length);
177 while (tle < end) {
178 switch (tle->nl) {
179 case 1:
180 book = book->next;
181 book->id = tle->container.id;
182 break;
183 case 0:
184 socket = add_cpus_to_mask(&tle->cpu, book, socket, 1);
185 break;
186 default:
187 clear_masks();
188 return;
189 }
190 tle = next_tle(tle);
191 }
192}
193
194static void tl_to_masks(struct sysinfo_15_1_x *info)
195{
196 struct cpuid cpu_id;
197
198 get_cpu_id(&cpu_id);
199 clear_masks();
200 switch (cpu_id.machine) {
201 case 0x2097:
202 case 0x2098:
203 __tl_to_masks_z10(info);
204 break;
205 default:
206 __tl_to_masks_generic(info);
207 }
208}
209
210static void topology_update_polarization_simple(void)
211{
212 int cpu;
213
214 mutex_lock(&smp_cpu_state_mutex);
215 for_each_possible_cpu(cpu)
216 smp_cpu_set_polarization(cpu, POLARIZATION_HRZ);
217 mutex_unlock(&smp_cpu_state_mutex);
218}
219
220static int ptf(unsigned long fc)
221{
222 int rc;
223
224 asm volatile(
225 " .insn rre,0xb9a20000,%1,%1\n"
226 " ipm %0\n"
227 " srl %0,28\n"
228 : "=d" (rc)
229 : "d" (fc) : "cc");
230 return rc;
231}
232
233int topology_set_cpu_management(int fc)
234{
235 int cpu, rc;
236
237 if (!MACHINE_HAS_TOPOLOGY)
238 return -EOPNOTSUPP;
239 if (fc)
240 rc = ptf(PTF_VERTICAL);
241 else
242 rc = ptf(PTF_HORIZONTAL);
243 if (rc)
244 return -EBUSY;
245 for_each_possible_cpu(cpu)
246 smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
247 return rc;
248}
249
250static void update_cpu_masks(void)
251{
252 struct cpu_topology_s390 *topo;
253 int cpu;
254
255 for_each_possible_cpu(cpu) {
256 topo = &per_cpu(cpu_topology, cpu);
257 topo->thread_mask = cpu_thread_map(cpu);
258 topo->core_mask = cpu_group_map(&socket_info, cpu);
259 topo->book_mask = cpu_group_map(&book_info, cpu);
260 if (!MACHINE_HAS_TOPOLOGY) {
261 topo->thread_id = cpu;
262 topo->core_id = cpu;
263 topo->socket_id = cpu;
264 topo->book_id = cpu;
265 }
266 }
267 numa_update_cpu_topology();
268}
269
270void store_topology(struct sysinfo_15_1_x *info)
271{
272 if (topology_max_mnest >= 3)
273 stsi(info, 15, 1, 3);
274 else
275 stsi(info, 15, 1, 2);
276}
277
278int arch_update_cpu_topology(void)
279{
280 struct sysinfo_15_1_x *info = tl_info;
281 struct device *dev;
282 int cpu, rc = 0;
283
284 if (MACHINE_HAS_TOPOLOGY) {
285 rc = 1;
286 store_topology(info);
287 tl_to_masks(info);
288 }
289 update_cpu_masks();
290 if (!MACHINE_HAS_TOPOLOGY)
291 topology_update_polarization_simple();
292 for_each_online_cpu(cpu) {
293 dev = get_cpu_device(cpu);
294 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
295 }
296 return rc;
297}
298
299static void topology_work_fn(struct work_struct *work)
300{
301 rebuild_sched_domains();
302}
303
304void topology_schedule_update(void)
305{
306 schedule_work(&topology_work);
307}
308
309static void topology_timer_fn(unsigned long ignored)
310{
311 if (ptf(PTF_CHECK))
312 topology_schedule_update();
313 set_topology_timer();
314}
315
316static struct timer_list topology_timer =
317 TIMER_DEFERRED_INITIALIZER(topology_timer_fn, 0, 0);
318
319static atomic_t topology_poll = ATOMIC_INIT(0);
320
321static void set_topology_timer(void)
322{
323 if (atomic_add_unless(&topology_poll, -1, 0))
324 mod_timer(&topology_timer, jiffies + HZ / 10);
325 else
326 mod_timer(&topology_timer, jiffies + HZ * 60);
327}
328
329void topology_expect_change(void)
330{
331 if (!MACHINE_HAS_TOPOLOGY)
332 return;
333
334
335
336 if (atomic_read(&topology_poll) > 60)
337 return;
338 atomic_add(60, &topology_poll);
339 set_topology_timer();
340}
341
342static int cpu_management;
343
344static ssize_t dispatching_show(struct device *dev,
345 struct device_attribute *attr,
346 char *buf)
347{
348 ssize_t count;
349
350 mutex_lock(&smp_cpu_state_mutex);
351 count = sprintf(buf, "%d\n", cpu_management);
352 mutex_unlock(&smp_cpu_state_mutex);
353 return count;
354}
355
356static ssize_t dispatching_store(struct device *dev,
357 struct device_attribute *attr,
358 const char *buf,
359 size_t count)
360{
361 int val, rc;
362 char delim;
363
364 if (sscanf(buf, "%d %c", &val, &delim) != 1)
365 return -EINVAL;
366 if (val != 0 && val != 1)
367 return -EINVAL;
368 rc = 0;
369 get_online_cpus();
370 mutex_lock(&smp_cpu_state_mutex);
371 if (cpu_management == val)
372 goto out;
373 rc = topology_set_cpu_management(val);
374 if (rc)
375 goto out;
376 cpu_management = val;
377 topology_expect_change();
378out:
379 mutex_unlock(&smp_cpu_state_mutex);
380 put_online_cpus();
381 return rc ? rc : count;
382}
383static DEVICE_ATTR(dispatching, 0644, dispatching_show,
384 dispatching_store);
385
386static ssize_t cpu_polarization_show(struct device *dev,
387 struct device_attribute *attr, char *buf)
388{
389 int cpu = dev->id;
390 ssize_t count;
391
392 mutex_lock(&smp_cpu_state_mutex);
393 switch (smp_cpu_get_polarization(cpu)) {
394 case POLARIZATION_HRZ:
395 count = sprintf(buf, "horizontal\n");
396 break;
397 case POLARIZATION_VL:
398 count = sprintf(buf, "vertical:low\n");
399 break;
400 case POLARIZATION_VM:
401 count = sprintf(buf, "vertical:medium\n");
402 break;
403 case POLARIZATION_VH:
404 count = sprintf(buf, "vertical:high\n");
405 break;
406 default:
407 count = sprintf(buf, "unknown\n");
408 break;
409 }
410 mutex_unlock(&smp_cpu_state_mutex);
411 return count;
412}
413static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
414
415static struct attribute *topology_cpu_attrs[] = {
416 &dev_attr_polarization.attr,
417 NULL,
418};
419
420static struct attribute_group topology_cpu_attr_group = {
421 .attrs = topology_cpu_attrs,
422};
423
424int topology_cpu_init(struct cpu *cpu)
425{
426 return sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
427}
428
429static const struct cpumask *cpu_thread_mask(int cpu)
430{
431 return &per_cpu(cpu_topology, cpu).thread_mask;
432}
433
434
435const struct cpumask *cpu_coregroup_mask(int cpu)
436{
437 return &per_cpu(cpu_topology, cpu).core_mask;
438}
439
440static const struct cpumask *cpu_book_mask(int cpu)
441{
442 return &per_cpu(cpu_topology, cpu).book_mask;
443}
444
445static int __init early_parse_topology(char *p)
446{
447 return kstrtobool(p, &topology_enabled);
448}
449early_param("topology", early_parse_topology);
450
451static struct sched_domain_topology_level s390_topology[] = {
452 { cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
453 { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
454 { cpu_book_mask, SD_INIT_NAME(BOOK) },
455 { cpu_cpu_mask, SD_INIT_NAME(DIE) },
456 { NULL, },
457};
458
459static void __init alloc_masks(struct sysinfo_15_1_x *info,
460 struct mask_info *mask, int offset)
461{
462 int i, nr_masks;
463
464 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
465 for (i = 0; i < info->mnest - offset; i++)
466 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
467 nr_masks = max(nr_masks, 1);
468 for (i = 0; i < nr_masks; i++) {
469 mask->next = kzalloc(sizeof(*mask->next), GFP_KERNEL);
470 mask = mask->next;
471 }
472}
473
474static int __init s390_topology_init(void)
475{
476 struct sysinfo_15_1_x *info;
477 int i;
478
479 if (!MACHINE_HAS_TOPOLOGY)
480 return 0;
481 tl_info = (struct sysinfo_15_1_x *)__get_free_page(GFP_KERNEL);
482 info = tl_info;
483 store_topology(info);
484 pr_info("The CPU configuration topology of the machine is:");
485 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
486 printk(KERN_CONT " %d", info->mag[i]);
487 printk(KERN_CONT " / %d\n", info->mnest);
488 alloc_masks(info, &socket_info, 1);
489 alloc_masks(info, &book_info, 2);
490 set_sched_topology(s390_topology);
491 return 0;
492}
493early_initcall(s390_topology_init);
494
495static int __init topology_init(void)
496{
497 if (MACHINE_HAS_TOPOLOGY)
498 set_topology_timer();
499 else
500 topology_update_polarization_simple();
501 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
502}
503device_initcall(topology_init);
504
