2 * Copyright IBM Corp. 2007
3 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
6 #define KMSG_COMPONENT "cpu"
7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9 #include <linux/kernel.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>
21 #define PTF_HORIZONTAL (0UL)
22 #define PTF_VERTICAL (1UL)
23 #define PTF_CHECK (2UL)
26 struct mask_info *next;
31 static int topology_enabled = 1;
32 static void topology_work_fn(struct work_struct *work);
33 static struct sysinfo_15_1_x *tl_info;
34 static struct timer_list topology_timer;
35 static void set_topology_timer(void);
36 static DECLARE_WORK(topology_work, topology_work_fn);
37 /* topology_lock protects the core linked list */
38 static DEFINE_SPINLOCK(topology_lock);
40 static struct mask_info core_info;
41 cpumask_t cpu_core_map[NR_CPUS];
42 unsigned char cpu_core_id[NR_CPUS];
44 #ifdef CONFIG_SCHED_BOOK
45 static struct mask_info book_info;
46 cpumask_t cpu_book_map[NR_CPUS];
47 unsigned char cpu_book_id[NR_CPUS];
50 static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
55 if (!topology_enabled || !MACHINE_HAS_TOPOLOGY) {
56 cpumask_copy(&mask, cpumask_of(cpu));
60 if (cpumask_test_cpu(cpu, &info->mask)) {
66 if (cpumask_empty(&mask))
67 cpumask_copy(&mask, cpumask_of(cpu));
71 static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu,
72 struct mask_info *book,
73 struct mask_info *core,
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))
82 unsigned int rcpu, lcpu;
84 rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin;
85 for_each_present_cpu(lcpu) {
86 if (cpu_logical_map(lcpu) != rcpu)
88 #ifdef CONFIG_SCHED_BOOK
89 cpumask_set_cpu(lcpu, &book->mask);
90 cpu_book_id[lcpu] = book->id;
92 cpumask_set_cpu(lcpu, &core->mask);
94 cpu_core_id[lcpu] = rcpu;
97 cpu_core_id[lcpu] = core->id;
99 smp_cpu_polarization[lcpu] = tl_cpu->pp;
105 static void clear_masks(void)
107 struct mask_info *info;
111 cpumask_clear(&info->mask);
114 #ifdef CONFIG_SCHED_BOOK
117 cpumask_clear(&info->mask);
123 static union topology_entry *next_tle(union topology_entry *tle)
126 return (union topology_entry *)((struct topology_cpu *)tle + 1);
127 return (union topology_entry *)((struct topology_container *)tle + 1);
130 static void tl_to_cores(struct sysinfo_15_1_x *info)
132 #ifdef CONFIG_SCHED_BOOK
133 struct mask_info *book = &book_info;
136 struct mask_info *book = NULL;
138 struct mask_info *core = &core_info;
139 union topology_entry *tle, *end;
142 #ifdef CONFIG_SCHED_BOOK
144 z10 = cpu_id.machine == 0x2097 || cpu_id.machine == 0x2098;
146 spin_lock_irq(&topology_lock);
149 end = (union topology_entry *)((unsigned long)info + info->length);
151 #ifdef CONFIG_SCHED_BOOK
156 book->id = tle->container.id;
159 core = add_cpus_to_mask(&tle->cpu, book, core, z10);
170 #ifdef CONFIG_SCHED_BOOK
173 book->id = tle->container.id;
178 core->id = tle->container.id;
181 add_cpus_to_mask(&tle->cpu, book, core, z10);
190 spin_unlock_irq(&topology_lock);
193 static void topology_update_polarization_simple(void)
197 mutex_lock(&smp_cpu_state_mutex);
198 for_each_possible_cpu(cpu)
199 smp_cpu_polarization[cpu] = POLARIZATION_HRZ;
200 mutex_unlock(&smp_cpu_state_mutex);
203 static int ptf(unsigned long fc)
208 " .insn rre,0xb9a20000,%1,%1\n"
216 int topology_set_cpu_management(int fc)
221 if (!MACHINE_HAS_TOPOLOGY)
224 rc = ptf(PTF_VERTICAL);
226 rc = ptf(PTF_HORIZONTAL);
229 for_each_possible_cpu(cpu)
230 smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
234 static void update_cpu_core_map(void)
239 spin_lock_irqsave(&topology_lock, flags);
240 for_each_possible_cpu(cpu) {
241 cpu_core_map[cpu] = cpu_group_map(&core_info, cpu);
242 #ifdef CONFIG_SCHED_BOOK
243 cpu_book_map[cpu] = cpu_group_map(&book_info, cpu);
246 spin_unlock_irqrestore(&topology_lock, flags);
249 void store_topology(struct sysinfo_15_1_x *info)
251 #ifdef CONFIG_SCHED_BOOK
254 rc = stsi(info, 15, 1, 3);
258 stsi(info, 15, 1, 2);
261 int arch_update_cpu_topology(void)
263 struct sysinfo_15_1_x *info = tl_info;
264 struct sys_device *sysdev;
267 if (!MACHINE_HAS_TOPOLOGY) {
268 update_cpu_core_map();
269 topology_update_polarization_simple();
272 store_topology(info);
274 update_cpu_core_map();
275 for_each_online_cpu(cpu) {
276 sysdev = get_cpu_sysdev(cpu);
277 kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
282 static void topology_work_fn(struct work_struct *work)
284 rebuild_sched_domains();
287 void topology_schedule_update(void)
289 schedule_work(&topology_work);
292 static void topology_timer_fn(unsigned long ignored)
295 topology_schedule_update();
296 set_topology_timer();
299 static void set_topology_timer(void)
301 topology_timer.function = topology_timer_fn;
302 topology_timer.data = 0;
303 topology_timer.expires = jiffies + 60 * HZ;
304 add_timer(&topology_timer);
307 static int __init early_parse_topology(char *p)
309 if (strncmp(p, "off", 3))
311 topology_enabled = 0;
314 early_param("topology", early_parse_topology);
316 static int __init init_topology_update(void)
321 if (!MACHINE_HAS_TOPOLOGY) {
322 topology_update_polarization_simple();
325 init_timer_deferrable(&topology_timer);
326 set_topology_timer();
328 update_cpu_core_map();
331 __initcall(init_topology_update);
333 static void __init alloc_masks(struct sysinfo_15_1_x *info,
334 struct mask_info *mask, int offset)
338 nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
339 for (i = 0; i < info->mnest - offset; i++)
340 nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
341 nr_masks = max(nr_masks, 1);
342 for (i = 0; i < nr_masks; i++) {
343 mask->next = alloc_bootmem(sizeof(struct mask_info));
348 void __init s390_init_cpu_topology(void)
350 struct sysinfo_15_1_x *info;
353 if (!MACHINE_HAS_TOPOLOGY)
355 tl_info = alloc_bootmem_pages(PAGE_SIZE);
357 store_topology(info);
358 pr_info("The CPU configuration topology of the machine is:");
359 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
360 printk(" %d", info->mag[i]);
361 printk(" / %d\n", info->mnest);
362 alloc_masks(info, &core_info, 1);
363 #ifdef CONFIG_SCHED_BOOK
364 alloc_masks(info, &book_info, 2);