1
2
3
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
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
309
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 update_cpu_masks();
455 return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
456}
457device_initcall(topology_init);
458
