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5
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;
49static struct mask_info drawer_info;
50
51DEFINE_PER_CPU(struct cpu_topology_s390, cpu_topology);
52EXPORT_PER_CPU_SYMBOL_GPL(cpu_topology);
53
54static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
55{
56 cpumask_t mask;
57
58 cpumask_copy(&mask, cpumask_of(cpu));
59 if (!topology_enabled || !MACHINE_HAS_TOPOLOGY)
60 return mask;
61 for (; info; info = info->next) {
62 if (cpumask_test_cpu(cpu, &info->mask))
63 return info->mask;
64 }
65 return mask;
66}
67
68static cpumask_t cpu_thread_map(unsigned int cpu)
69{
70 cpumask_t mask;
71 int i;
72
73 cpumask_copy(&mask, cpumask_of(cpu));
74 if (!topology_enabled || !MACHINE_HAS_TOPOLOGY)
75 return mask;
76 cpu -= cpu % (smp_cpu_mtid + 1);
77 for (i = 0; i <= smp_cpu_mtid; i++)
78 if (cpu_present(cpu + i))
79 cpumask_set_cpu(cpu + i, &mask);
80 return mask;
81}
82
83static void add_cpus_to_mask(struct topology_core *tl_core,
84 struct mask_info *drawer,
85 struct mask_info *book,
86 struct mask_info *socket)
87{
88 struct cpu_topology_s390 *topo;
89 unsigned int core;
90
91 for_each_set_bit(core, &tl_core->mask[0], TOPOLOGY_CORE_BITS) {
92 unsigned int rcore;
93 int lcpu, i;
94
95 rcore = TOPOLOGY_CORE_BITS - 1 - core + tl_core->origin;
96 lcpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
97 if (lcpu < 0)
98 continue;
99 for (i = 0; i <= smp_cpu_mtid; i++) {
100 topo = &per_cpu(cpu_topology, lcpu + i);
101 topo->drawer_id = drawer->id;
102 topo->book_id = book->id;
103 topo->socket_id = socket->id;
104 topo->core_id = rcore;
105 topo->thread_id = lcpu + i;
106 cpumask_set_cpu(lcpu + i, &drawer->mask);
107 cpumask_set_cpu(lcpu + i, &book->mask);
108 cpumask_set_cpu(lcpu + i, &socket->mask);
109 smp_cpu_set_polarization(lcpu + i, tl_core->pp);
110 }
111 }
112}
113
114static void clear_masks(void)
115{
116 struct mask_info *info;
117
118 info = &socket_info;
119 while (info) {
120 cpumask_clear(&info->mask);
121 info = info->next;
122 }
123 info = &book_info;
124 while (info) {
125 cpumask_clear(&info->mask);
126 info = info->next;
127 }
128 info = &drawer_info;
129 while (info) {
130 cpumask_clear(&info->mask);
131 info = info->next;
132 }
133}
134
135static union topology_entry *next_tle(union topology_entry *tle)
136{
137 if (!tle->nl)
138 return (union topology_entry *)((struct topology_core *)tle + 1);
139 return (union topology_entry *)((struct topology_container *)tle + 1);
140}
141
142static void tl_to_masks(struct sysinfo_15_1_x *info)
143{
144 struct mask_info *socket = &socket_info;
145 struct mask_info *book = &book_info;
146 struct mask_info *drawer = &drawer_info;
147 union topology_entry *tle, *end;
148
149 clear_masks();
150 tle = info->tle;
151 end = (union topology_entry *)((unsigned long)info + info->length);
152 while (tle < end) {
153 switch (tle->nl) {
154 case 3:
155 drawer = drawer->next;
156 drawer->id = tle->container.id;
157 break;
158 case 2:
159 book = book->next;
160 book->id = tle->container.id;
161 break;
162 case 1:
163 socket = socket->next;
164 socket->id = tle->container.id;
165 break;
166 case 0:
167 add_cpus_to_mask(&tle->cpu, drawer, book, socket);
168 break;
169 default:
170 clear_masks();
171 return;
172 }
173 tle = next_tle(tle);
174 }
175}
176
177static void topology_update_polarization_simple(void)
178{
179 int cpu;
180
181 mutex_lock(&smp_cpu_state_mutex);
182 for_each_possible_cpu(cpu)
183 smp_cpu_set_polarization(cpu, POLARIZATION_HRZ);
184 mutex_unlock(&smp_cpu_state_mutex);
185}
186
187static int ptf(unsigned long fc)
188{
189 int rc;
190
191 asm volatile(
192 " .insn rre,0xb9a20000,%1,%1\n"
193 " ipm %0\n"
194 " srl %0,28\n"
195 : "=d" (rc)
196 : "d" (fc) : "cc");
197 return rc;
198}
199
200int topology_set_cpu_management(int fc)
201{
202 int cpu, rc;
203
204 if (!MACHINE_HAS_TOPOLOGY)
205 return -EOPNOTSUPP;
206 if (fc)
207 rc = ptf(PTF_VERTICAL);
208 else
209 rc = ptf(PTF_HORIZONTAL);
210 if (rc)
211 return -EBUSY;
212 for_each_possible_cpu(cpu)
213 smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
214 return rc;
215}
216
217static void update_cpu_masks(void)
218{
219 struct cpu_topology_s390 *topo;
220 int cpu;
221
222 for_each_possible_cpu(cpu) {
223 topo = &per_cpu(cpu_topology, cpu);
224 topo->thread_mask = cpu_thread_map(cpu);
225 topo->core_mask = cpu_group_map(&socket_info, cpu);
226 topo->book_mask = cpu_group_map(&book_info, cpu);
227 topo->drawer_mask = cpu_group_map(&drawer_info, cpu);
228 if (!MACHINE_HAS_TOPOLOGY) {
229 topo->thread_id = cpu;
230 topo->core_id = cpu;
231 topo->socket_id = cpu;
232 topo->book_id = cpu;
233 topo->drawer_id = cpu;
234 }
235 }
236 numa_update_cpu_topology();
237}
238
239void store_topology(struct sysinfo_15_1_x *info)
240{
241 stsi(info, 15, 1, min(topology_max_mnest, 4));
242}
243
244int arch_update_cpu_topology(void)
245{
246 struct sysinfo_15_1_x *info = tl_info;
247 struct device *dev;
248 int cpu, rc = 0;
249
250 if (MACHINE_HAS_TOPOLOGY) {
251 rc = 1;
252 store_topology(info);
253 tl_to_masks(info);
254 }
255 update_cpu_masks();
256 if (!MACHINE_HAS_TOPOLOGY)
257 topology_update_polarization_simple();
258 for_each_online_cpu(cpu) {
259 dev = get_cpu_device(cpu);
260 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
261 }
262 return rc;
263}
264
265static void topology_work_fn(struct work_struct *work)
266{
267 rebuild_sched_domains();
268}
269
270void topology_schedule_update(void)
271{
272 schedule_work(&topology_work);
273}
274
275static void topology_timer_fn(unsigned long ignored)
276{
277 if (ptf(PTF_CHECK))
278 topology_schedule_update();
279 set_topology_timer();
280}
281
282static struct timer_list topology_timer =
283 TIMER_DEFERRED_INITIALIZER(topology_timer_fn, 0, 0);
284
285static atomic_t topology_poll = ATOMIC_INIT(0);
286
287static void set_topology_timer(void)
288{
289 if (atomic_add_unless(&topology_poll, -1, 0))
290 mod_timer(&topology_timer, jiffies + HZ / 10);
291 else
292 mod_timer(&topology_timer, jiffies + HZ * 60);
293}
294
295void topology_expect_change(void)
296{
297 if (!MACHINE_HAS_TOPOLOGY)
298 return;
299
300
301
302 if (atomic_read(&topology_poll) > 60)
303 return;
304 atomic_add(60, &topology_poll);
305 set_topology_timer();
306}
307
308static int cpu_management;
309
310static ssize_t dispatching_show(struct device *dev,
311 struct device_attribute *attr,
312 char *buf)
313{
314 ssize_t count;
315
316 mutex_lock(&smp_cpu_state_mutex);
317 count = sprintf(buf, "%d\n", cpu_management);
318 mutex_unlock(&smp_cpu_state_mutex);
319 return count;
320}
321
322static ssize_t dispatching_store(struct device *dev,
323 struct device_attribute *attr,
324 const char *buf,
325 size_t count)
326{
327 int val, rc;
328 char delim;
329
330 if (sscanf(buf, "%d %c", &val, &delim) != 1)
331 return -EINVAL;
332 if (val != 0 && val != 1)
333 return -EINVAL;
334 rc = 0;
335 get_online_cpus();
336 mutex_lock(&smp_cpu_state_mutex);
337 if (cpu_management == val)
338 goto out;
339 rc = topology_set_cpu_management(val);
340 if (rc)
341 goto out;
342 cpu_management = val;
343 topology_expect_change();
344out:
345 mutex_unlock(&smp_cpu_state_mutex);
346 put_online_cpus();
347 return rc ? rc : count;
348}
349static DEVICE_ATTR(dispatching, 0644, dispatching_show,
350 dispatching_store);
351
352static ssize_t cpu_polarization_show(struct device *dev,
353 struct device_attribute *attr, char *buf)
354{
355 int cpu = dev->id;
356 ssize_t count;
357
358 mutex_lock(&smp_cpu_state_mutex);
359 switch (smp_cpu_get_polarization(cpu)) {
360 case POLARIZATION_HRZ:
361 count = sprintf(buf, "horizontal\n");
362 break;
363 case POLARIZATION_VL:
364 count = sprintf(buf, "vertical:low\n");
365 break;
366 case POLARIZATION_VM:
367 count = sprintf(buf, "vertical:medium\n");
368 break;
369 case POLARIZATION_VH:
370 count = sprintf(buf, "vertical:high\n");
371 break;
372 default:
373 count = sprintf(buf, "unknown\n");
374 break;
375 }
376 mutex_unlock(&smp_cpu_state_mutex);
377 return count;
378}
379static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
380
381static struct attribute *topology_cpu_attrs[] = {
382 &dev_attr_polarization.attr,
383 NULL,
384};
385
386static struct attribute_group topology_cpu_attr_group = {
387 .attrs = topology_cpu_attrs,
388};
389
390int topology_cpu_init(struct cpu *cpu)
391{
392 return sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
393}
394
395static const struct cpumask *cpu_thread_mask(int cpu)
396{
397 return &per_cpu(cpu_topology, cpu).thread_mask;
398}
399
400
401const struct cpumask *cpu_coregroup_mask(int cpu)
402{
403 return &per_cpu(cpu_topology, cpu).core_mask;
404}
405
406static const struct cpumask *cpu_book_mask(int cpu)
407{
408 return &per_cpu(cpu_topology, cpu).book_mask;
409}
410
411static const struct cpumask *cpu_drawer_mask(int cpu)
412{
413 return &per_cpu(cpu_topology, cpu).drawer_mask;
414}
415
416static int __init early_parse_topology(char *p)
417{
418 return kstrtobool(p, &topology_enabled);
419}
420early_param("topology", early_parse_topology);
421
422static struct sched_domain_topology_level s390_topology[] = {
423 { cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
424 { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
425 { cpu_book_mask, SD_INIT_NAME(BOOK) },
426 { cpu_drawer_mask, SD_INIT_NAME(DRAWER) },
427 { cpu_cpu_mask, SD_INIT_NAME(DIE) },
428 { NULL, },
429};
430
431static void __init alloc_masks(struct sysinfo_15_1_x *info,
432 struct mask_info *mask, int offset)
433{
434 int i, nr_masks;
435
436 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
437 for (i = 0; i < info->mnest - offset; i++)
438 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
439 nr_masks = max(nr_masks, 1);
440 for (i = 0; i < nr_masks; i++) {
441 mask->next = kzalloc(sizeof(*mask->next), GFP_KERNEL);
442 mask = mask->next;
443 }
444}
445
446static int __init s390_topology_init(void)
447{
448 struct sysinfo_15_1_x *info;
449 int i;
450
451 if (!MACHINE_HAS_TOPOLOGY)
452 return 0;
453 tl_info = (struct sysinfo_15_1_x *)__get_free_page(GFP_KERNEL);
454 info = tl_info;
455 store_topology(info);
456 pr_info("The CPU configuration topology of the machine is:");
457 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
458 printk(KERN_CONT " %d", info->mag[i]);
459 printk(KERN_CONT " / %d\n", info->mnest);
460 alloc_masks(info, &socket_info, 1);
461 alloc_masks(info, &book_info, 2);
462 alloc_masks(info, &drawer_info, 3);
463 set_sched_topology(s390_topology);
464 return 0;
465}
466early_initcall(s390_topology_init);
467
468static int __init topology_init(void)
469{
470 if (MACHINE_HAS_TOPOLOGY)
471 set_topology_timer();
472 else
473 topology_update_polarization_simple();
474 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
475}
476device_initcall(topology_init);
477
