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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/bootmem.h>
11#include <linux/cpuset.h>
12#include <linux/device.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/cpu.h>
18#include <linux/smp.h>
19#include <linux/mm.h>
20
21#define PTF_HORIZONTAL (0UL)
22#define PTF_VERTICAL (1UL)
23#define PTF_CHECK (2UL)
24
25struct mask_info {
26 struct mask_info *next;
27 unsigned char id;
28 cpumask_t mask;
29};
30
31static int topology_enabled = 1;
32static void topology_work_fn(struct work_struct *work);
33static struct sysinfo_15_1_x *tl_info;
34static void set_topology_timer(void);
35static DECLARE_WORK(topology_work, topology_work_fn);
36
37static DEFINE_SPINLOCK(topology_lock);
38
39static struct mask_info core_info;
40cpumask_t cpu_core_map[NR_CPUS];
41unsigned char cpu_core_id[NR_CPUS];
42
43static struct mask_info book_info;
44cpumask_t cpu_book_map[NR_CPUS];
45unsigned char cpu_book_id[NR_CPUS];
46
47
48int cpu_polarization[NR_CPUS];
49
50static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
51{
52 cpumask_t mask;
53
54 cpumask_clear(&mask);
55 if (!topology_enabled || !MACHINE_HAS_TOPOLOGY) {
56 cpumask_copy(&mask, cpumask_of(cpu));
57 return mask;
58 }
59 while (info) {
60 if (cpumask_test_cpu(cpu, &info->mask)) {
61 mask = info->mask;
62 break;
63 }
64 info = info->next;
65 }
66 if (cpumask_empty(&mask))
67 cpumask_copy(&mask, cpumask_of(cpu));
68 return mask;
69}
70
71static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu,
72 struct mask_info *book,
73 struct mask_info *core,
74 int one_core_per_cpu)
75{
76 unsigned int cpu;
77
78 for (cpu = find_first_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS);
79 cpu < TOPOLOGY_CPU_BITS;
80 cpu = find_next_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS, cpu + 1))
81 {
82 unsigned int rcpu, lcpu;
83
84 rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin;
85 for_each_present_cpu(lcpu) {
86 if (cpu_logical_map(lcpu) != rcpu)
87 continue;
88 cpumask_set_cpu(lcpu, &book->mask);
89 cpu_book_id[lcpu] = book->id;
90 cpumask_set_cpu(lcpu, &core->mask);
91 if (one_core_per_cpu) {
92 cpu_core_id[lcpu] = rcpu;
93 core = core->next;
94 } else {
95 cpu_core_id[lcpu] = core->id;
96 }
97 cpu_set_polarization(lcpu, tl_cpu->pp);
98 }
99 }
100 return core;
101}
102
103static void clear_masks(void)
104{
105 struct mask_info *info;
106
107 info = &core_info;
108 while (info) {
109 cpumask_clear(&info->mask);
110 info = info->next;
111 }
112 info = &book_info;
113 while (info) {
114 cpumask_clear(&info->mask);
115 info = info->next;
116 }
117}
118
119static union topology_entry *next_tle(union topology_entry *tle)
120{
121 if (!tle->nl)
122 return (union topology_entry *)((struct topology_cpu *)tle + 1);
123 return (union topology_entry *)((struct topology_container *)tle + 1);
124}
125
126static void __tl_to_cores_generic(struct sysinfo_15_1_x *info)
127{
128 struct mask_info *core = &core_info;
129 struct mask_info *book = &book_info;
130 union topology_entry *tle, *end;
131
132 tle = info->tle;
133 end = (union topology_entry *)((unsigned long)info + info->length);
134 while (tle < end) {
135 switch (tle->nl) {
136 case 2:
137 book = book->next;
138 book->id = tle->container.id;
139 break;
140 case 1:
141 core = core->next;
142 core->id = tle->container.id;
143 break;
144 case 0:
145 add_cpus_to_mask(&tle->cpu, book, core, 0);
146 break;
147 default:
148 clear_masks();
149 return;
150 }
151 tle = next_tle(tle);
152 }
153}
154
155static void __tl_to_cores_z10(struct sysinfo_15_1_x *info)
156{
157 struct mask_info *core = &core_info;
158 struct mask_info *book = &book_info;
159 union topology_entry *tle, *end;
160
161 tle = info->tle;
162 end = (union topology_entry *)((unsigned long)info + info->length);
163 while (tle < end) {
164 switch (tle->nl) {
165 case 1:
166 book = book->next;
167 book->id = tle->container.id;
168 break;
169 case 0:
170 core = add_cpus_to_mask(&tle->cpu, book, core, 1);
171 break;
172 default:
173 clear_masks();
174 return;
175 }
176 tle = next_tle(tle);
177 }
178}
179
180static void tl_to_cores(struct sysinfo_15_1_x *info)
181{
182 struct cpuid cpu_id;
183
184 get_cpu_id(&cpu_id);
185 spin_lock_irq(&topology_lock);
186 clear_masks();
187 switch (cpu_id.machine) {
188 case 0x2097:
189 case 0x2098:
190 __tl_to_cores_z10(info);
191 break;
192 default:
193 __tl_to_cores_generic(info);
194 }
195 spin_unlock_irq(&topology_lock);
196}
197
198static void topology_update_polarization_simple(void)
199{
200 int cpu;
201
202 mutex_lock(&smp_cpu_state_mutex);
203 for_each_possible_cpu(cpu)
204 cpu_set_polarization(cpu, POLARIZATION_HRZ);
205 mutex_unlock(&smp_cpu_state_mutex);
206}
207
208static int ptf(unsigned long fc)
209{
210 int rc;
211
212 asm volatile(
213 " .insn rre,0xb9a20000,%1,%1\n"
214 " ipm %0\n"
215 " srl %0,28\n"
216 : "=d" (rc)
217 : "d" (fc) : "cc");
218 return rc;
219}
220
221int topology_set_cpu_management(int fc)
222{
223 int cpu, rc;
224
225 if (!MACHINE_HAS_TOPOLOGY)
226 return -EOPNOTSUPP;
227 if (fc)
228 rc = ptf(PTF_VERTICAL);
229 else
230 rc = ptf(PTF_HORIZONTAL);
231 if (rc)
232 return -EBUSY;
233 for_each_possible_cpu(cpu)
234 cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
235 return rc;
236}
237
238static void update_cpu_core_map(void)
239{
240 unsigned long flags;
241 int cpu;
242
243 spin_lock_irqsave(&topology_lock, flags);
244 for_each_possible_cpu(cpu) {
245 cpu_core_map[cpu] = cpu_group_map(&core_info, cpu);
246 cpu_book_map[cpu] = cpu_group_map(&book_info, cpu);
247 }
248 spin_unlock_irqrestore(&topology_lock, flags);
249}
250
251void store_topology(struct sysinfo_15_1_x *info)
252{
253 int rc;
254
255 rc = stsi(info, 15, 1, 3);
256 if (rc != -ENOSYS)
257 return;
258 stsi(info, 15, 1, 2);
259}
260
261int arch_update_cpu_topology(void)
262{
263 struct sysinfo_15_1_x *info = tl_info;
264 struct device *dev;
265 int cpu;
266
267 if (!MACHINE_HAS_TOPOLOGY) {
268 update_cpu_core_map();
269 topology_update_polarization_simple();
270 return 0;
271 }
272 store_topology(info);
273 tl_to_cores(info);
274 update_cpu_core_map();
275 for_each_online_cpu(cpu) {
276 dev = get_cpu_device(cpu);
277 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
278 }
279 return 1;
280}
281
282static void topology_work_fn(struct work_struct *work)
283{
284 rebuild_sched_domains();
285}
286
287void topology_schedule_update(void)
288{
289 schedule_work(&topology_work);
290}
291
292static void topology_timer_fn(unsigned long ignored)
293{
294 if (ptf(PTF_CHECK))
295 topology_schedule_update();
296 set_topology_timer();
297}
298
299static struct timer_list topology_timer =
300 TIMER_DEFERRED_INITIALIZER(topology_timer_fn, 0, 0);
301
302static atomic_t topology_poll = ATOMIC_INIT(0);
303
304static void set_topology_timer(void)
305{
306 if (atomic_add_unless(&topology_poll, -1, 0))
307 mod_timer(&topology_timer, jiffies + HZ / 10);
308 else
309 mod_timer(&topology_timer, jiffies + HZ * 60);
310}
311
312void topology_expect_change(void)
313{
314 if (!MACHINE_HAS_TOPOLOGY)
315 return;
316
317
318
319 if (atomic_read(&topology_poll) > 60)
320 return;
321 atomic_add(60, &topology_poll);
322 set_topology_timer();
323}
324
325static int __init early_parse_topology(char *p)
326{
327 if (strncmp(p, "off", 3))
328 return 0;
329 topology_enabled = 0;
330 return 0;
331}
332early_param("topology", early_parse_topology);
333
334static void __init alloc_masks(struct sysinfo_15_1_x *info,
335 struct mask_info *mask, int offset)
336{
337 int i, nr_masks;
338
339 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
340 for (i = 0; i < info->mnest - offset; i++)
341 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
342 nr_masks = max(nr_masks, 1);
343 for (i = 0; i < nr_masks; i++) {
344 mask->next = alloc_bootmem(sizeof(struct mask_info));
345 mask = mask->next;
346 }
347}
348
349void __init s390_init_cpu_topology(void)
350{
351 struct sysinfo_15_1_x *info;
352 int i;
353
354 if (!MACHINE_HAS_TOPOLOGY)
355 return;
356 tl_info = alloc_bootmem_pages(PAGE_SIZE);
357 info = tl_info;
358 store_topology(info);
359 pr_info("The CPU configuration topology of the machine is:");
360 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
361 printk(KERN_CONT " %d", info->mag[i]);
362 printk(KERN_CONT " / %d\n", info->mnest);
363 alloc_masks(info, &core_info, 1);
364 alloc_masks(info, &book_info, 2);
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(dispatching, 0644, dispatching_show,
409 dispatching_store);
410
411static ssize_t cpu_polarization_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
413{
414 int cpu = dev->id;
415 ssize_t count;
416
417 mutex_lock(&smp_cpu_state_mutex);
418 switch (cpu_read_polarization(cpu)) {
419 case POLARIZATION_HRZ:
420 count = sprintf(buf, "horizontal\n");
421 break;
422 case POLARIZATION_VL:
423 count = sprintf(buf, "vertical:low\n");
424 break;
425 case POLARIZATION_VM:
426 count = sprintf(buf, "vertical:medium\n");
427 break;
428 case POLARIZATION_VH:
429 count = sprintf(buf, "vertical:high\n");
430 break;
431 default:
432 count = sprintf(buf, "unknown\n");
433 break;
434 }
435 mutex_unlock(&smp_cpu_state_mutex);
436 return count;
437}
438static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
439
440static struct attribute *topology_cpu_attrs[] = {
441 &dev_attr_polarization.attr,
442 NULL,
443};
444
445static struct attribute_group topology_cpu_attr_group = {
446 .attrs = topology_cpu_attrs,
447};
448
449int topology_cpu_init(struct cpu *cpu)
450{
451 return sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
452}
453
454static int __init topology_init(void)
455{
456 if (!MACHINE_HAS_TOPOLOGY) {
457 topology_update_polarization_simple();
458 goto out;
459 }
460 set_topology_timer();
461out:
462 update_cpu_core_map();
463 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
464}
465device_initcall(topology_init);
466
