1
2
3
4
5
6#define KMSG_COMPONENT "cpu"
7#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
8
9#include <linux/kernel.h>
10#include <linux/mm.h>
11#include <linux/init.h>
12#include <linux/device.h>
13#include <linux/bootmem.h>
14#include <linux/sched.h>
15#include <linux/workqueue.h>
16#include <linux/cpu.h>
17#include <linux/smp.h>
18#include <linux/cpuset.h>
19#include <asm/delay.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 struct timer_list topology_timer;
35static void set_topology_timer(void);
36static DECLARE_WORK(topology_work, topology_work_fn);
37
38static DEFINE_SPINLOCK(topology_lock);
39
40static struct mask_info core_info;
41cpumask_t cpu_core_map[NR_CPUS];
42unsigned char cpu_core_id[NR_CPUS];
43
44#ifdef CONFIG_SCHED_BOOK
45static struct mask_info book_info;
46cpumask_t cpu_book_map[NR_CPUS];
47unsigned char cpu_book_id[NR_CPUS];
48#endif
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 void add_cpus_to_mask(struct topology_cpu *tl_cpu,
72 struct mask_info *book, struct mask_info *core)
73{
74 unsigned int cpu;
75
76 for (cpu = find_first_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS);
77 cpu < TOPOLOGY_CPU_BITS;
78 cpu = find_next_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS, cpu + 1))
79 {
80 unsigned int rcpu, lcpu;
81
82 rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin;
83 for_each_present_cpu(lcpu) {
84 if (cpu_logical_map(lcpu) != rcpu)
85 continue;
86#ifdef CONFIG_SCHED_BOOK
87 cpumask_set_cpu(lcpu, &book->mask);
88 cpu_book_id[lcpu] = book->id;
89#endif
90 cpumask_set_cpu(lcpu, &core->mask);
91 cpu_core_id[lcpu] = core->id;
92 smp_cpu_polarization[lcpu] = tl_cpu->pp;
93 }
94 }
95}
96
97static void clear_masks(void)
98{
99 struct mask_info *info;
100
101 info = &core_info;
102 while (info) {
103 cpumask_clear(&info->mask);
104 info = info->next;
105 }
106#ifdef CONFIG_SCHED_BOOK
107 info = &book_info;
108 while (info) {
109 cpumask_clear(&info->mask);
110 info = info->next;
111 }
112#endif
113}
114
115static union topology_entry *next_tle(union topology_entry *tle)
116{
117 if (!tle->nl)
118 return (union topology_entry *)((struct topology_cpu *)tle + 1);
119 return (union topology_entry *)((struct topology_container *)tle + 1);
120}
121
122static void tl_to_cores(struct sysinfo_15_1_x *info)
123{
124#ifdef CONFIG_SCHED_BOOK
125 struct mask_info *book = &book_info;
126#else
127 struct mask_info *book = NULL;
128#endif
129 struct mask_info *core = &core_info;
130 union topology_entry *tle, *end;
131
132
133 spin_lock_irq(&topology_lock);
134 clear_masks();
135 tle = info->tle;
136 end = (union topology_entry *)((unsigned long)info + info->length);
137 while (tle < end) {
138 switch (tle->nl) {
139#ifdef CONFIG_SCHED_BOOK
140 case 2:
141 book = book->next;
142 book->id = tle->container.id;
143 break;
144#endif
145 case 1:
146 core = core->next;
147 core->id = tle->container.id;
148 break;
149 case 0:
150 add_cpus_to_mask(&tle->cpu, book, core);
151 break;
152 default:
153 clear_masks();
154 goto out;
155 }
156 tle = next_tle(tle);
157 }
158out:
159 spin_unlock_irq(&topology_lock);
160}
161
162static void topology_update_polarization_simple(void)
163{
164 int cpu;
165
166 mutex_lock(&smp_cpu_state_mutex);
167 for_each_possible_cpu(cpu)
168 smp_cpu_polarization[cpu] = POLARIZATION_HRZ;
169 mutex_unlock(&smp_cpu_state_mutex);
170}
171
172static int ptf(unsigned long fc)
173{
174 int rc;
175
176 asm volatile(
177 " .insn rre,0xb9a20000,%1,%1\n"
178 " ipm %0\n"
179 " srl %0,28\n"
180 : "=d" (rc)
181 : "d" (fc) : "cc");
182 return rc;
183}
184
185int topology_set_cpu_management(int fc)
186{
187 int cpu;
188 int rc;
189
190 if (!MACHINE_HAS_TOPOLOGY)
191 return -EOPNOTSUPP;
192 if (fc)
193 rc = ptf(PTF_VERTICAL);
194 else
195 rc = ptf(PTF_HORIZONTAL);
196 if (rc)
197 return -EBUSY;
198 for_each_possible_cpu(cpu)
199 smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
200 return rc;
201}
202
203static void update_cpu_core_map(void)
204{
205 unsigned long flags;
206 int cpu;
207
208 spin_lock_irqsave(&topology_lock, flags);
209 for_each_possible_cpu(cpu) {
210 cpu_core_map[cpu] = cpu_group_map(&core_info, cpu);
211#ifdef CONFIG_SCHED_BOOK
212 cpu_book_map[cpu] = cpu_group_map(&book_info, cpu);
213#endif
214 }
215 spin_unlock_irqrestore(&topology_lock, flags);
216}
217
218void store_topology(struct sysinfo_15_1_x *info)
219{
220#ifdef CONFIG_SCHED_BOOK
221 int rc;
222
223 rc = stsi(info, 15, 1, 3);
224 if (rc != -ENOSYS)
225 return;
226#endif
227 stsi(info, 15, 1, 2);
228}
229
230int arch_update_cpu_topology(void)
231{
232 struct sysinfo_15_1_x *info = tl_info;
233 struct sys_device *sysdev;
234 int cpu;
235
236 if (!MACHINE_HAS_TOPOLOGY) {
237 update_cpu_core_map();
238 topology_update_polarization_simple();
239 return 0;
240 }
241 store_topology(info);
242 tl_to_cores(info);
243 update_cpu_core_map();
244 for_each_online_cpu(cpu) {
245 sysdev = get_cpu_sysdev(cpu);
246 kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
247 }
248 return 1;
249}
250
251static void topology_work_fn(struct work_struct *work)
252{
253 rebuild_sched_domains();
254}
255
256void topology_schedule_update(void)
257{
258 schedule_work(&topology_work);
259}
260
261static void topology_timer_fn(unsigned long ignored)
262{
263 if (ptf(PTF_CHECK))
264 topology_schedule_update();
265 set_topology_timer();
266}
267
268static void set_topology_timer(void)
269{
270 topology_timer.function = topology_timer_fn;
271 topology_timer.data = 0;
272 topology_timer.expires = jiffies + 60 * HZ;
273 add_timer(&topology_timer);
274}
275
276static int __init early_parse_topology(char *p)
277{
278 if (strncmp(p, "off", 3))
279 return 0;
280 topology_enabled = 0;
281 return 0;
282}
283early_param("topology", early_parse_topology);
284
285static int __init init_topology_update(void)
286{
287 int rc;
288
289 rc = 0;
290 if (!MACHINE_HAS_TOPOLOGY) {
291 topology_update_polarization_simple();
292 goto out;
293 }
294 init_timer_deferrable(&topology_timer);
295 set_topology_timer();
296out:
297 update_cpu_core_map();
298 return rc;
299}
300__initcall(init_topology_update);
301
302static void alloc_masks(struct sysinfo_15_1_x *info, struct mask_info *mask,
303 int offset)
304{
305 int i, nr_masks;
306
307 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
308 for (i = 0; i < info->mnest - offset; i++)
309 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
310 nr_masks = max(nr_masks, 1);
311 for (i = 0; i < nr_masks; i++) {
312 mask->next = alloc_bootmem(sizeof(struct mask_info));
313 mask = mask->next;
314 }
315}
316
317void __init s390_init_cpu_topology(void)
318{
319 struct sysinfo_15_1_x *info;
320 int i;
321
322 if (!MACHINE_HAS_TOPOLOGY)
323 return;
324 tl_info = alloc_bootmem_pages(PAGE_SIZE);
325 info = tl_info;
326 store_topology(info);
327 pr_info("The CPU configuration topology of the machine is:");
328 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
329 printk(" %d", info->mag[i]);
330 printk(" / %d\n", info->mnest);
331 alloc_masks(info, &core_info, 2);
332#ifdef CONFIG_SCHED_BOOK
333 alloc_masks(info, &book_info, 3);
334#endif
335}
336
