2 * arch/s390/kernel/smp.c
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 * Heiko Carstens (heiko.carstens@de.ibm.com)
9 * based on other smp stuff by
10 * (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net>
11 * (c) 1998 Ingo Molnar
13 * We work with logical cpu numbering everywhere we can. The only
14 * functions using the real cpu address (got from STAP) are the sigp
15 * functions. For all other functions we use the identity mapping.
16 * That means that cpu_number_map[i] == i for every cpu. cpu_number_map is
17 * used e.g. to find the idle task belonging to a logical cpu. Every array
18 * in the kernel is sorted by the logical cpu number and not by the physical
19 * one which is causing all the confusion with __cpu_logical_map and
20 * cpu_number_map in other architectures.
23 #define KMSG_COMPONENT "cpu"
24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
26 #include <linux/workqueue.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
30 #include <linux/err.h>
31 #include <linux/spinlock.h>
32 #include <linux/kernel_stat.h>
33 #include <linux/delay.h>
34 #include <linux/cache.h>
35 #include <linux/interrupt.h>
36 #include <linux/irqflags.h>
37 #include <linux/cpu.h>
38 #include <linux/timex.h>
39 #include <linux/bootmem.h>
40 #include <linux/slab.h>
41 #include <linux/crash_dump.h>
42 #include <asm/asm-offsets.h>
44 #include <asm/setup.h>
46 #include <asm/pgalloc.h>
48 #include <asm/cpcmd.h>
49 #include <asm/tlbflush.h>
50 #include <asm/timer.h>
51 #include <asm/lowcore.h>
53 #include <asm/cputime.h>
58 /* logical cpu to cpu address */
59 unsigned short __cpu_logical_map[NR_CPUS];
61 static struct task_struct *current_set[NR_CPUS];
63 static u8 smp_cpu_type;
64 static int smp_use_sigp_detection;
71 DEFINE_MUTEX(smp_cpu_state_mutex);
72 int smp_cpu_polarization[NR_CPUS];
73 static int smp_cpu_state[NR_CPUS];
74 static int cpu_management;
76 static DEFINE_PER_CPU(struct cpu, cpu_devices);
78 static void smp_ext_bitcall(int, int);
80 static int raw_cpu_stopped(int cpu)
84 switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) {
85 case sigp_status_stored:
86 /* Check for stopped and check stop state */
96 static inline int cpu_stopped(int cpu)
98 return raw_cpu_stopped(cpu_logical_map(cpu));
102 * Ensure that PSW restart is done on an online CPU
104 void smp_restart_with_online_cpu(void)
108 for_each_online_cpu(cpu) {
109 if (stap() == __cpu_logical_map[cpu]) {
110 /* We are online: Enable DAT again and return */
111 __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
115 /* We are not online: Do PSW restart on an online CPU */
116 while (sigp(cpu, sigp_restart) == sigp_busy)
118 /* And stop ourself */
119 while (raw_sigp(stap(), sigp_stop) == sigp_busy)
124 void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
126 struct _lowcore *lc, *current_lc;
127 struct stack_frame *sf;
128 struct pt_regs *regs;
131 if (smp_processor_id() == 0)
133 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE |
134 PSW_MASK_EA | PSW_MASK_BA);
135 /* Disable lowcore protection */
136 __ctl_clear_bit(0, 28);
137 current_lc = lowcore_ptr[smp_processor_id()];
141 lc->restart_psw.mask =
142 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
143 lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu;
145 smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]);
146 while (sigp(0, sigp_stop_and_store_status) == sigp_busy)
148 sp = lc->panic_stack;
149 sp -= sizeof(struct pt_regs);
150 regs = (struct pt_regs *) sp;
151 memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs));
152 regs->psw = lc->psw_save_area;
153 sp -= STACK_FRAME_OVERHEAD;
154 sf = (struct stack_frame *) sp;
155 sf->back_chain = regs->gprs[15];
156 smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
159 void smp_send_stop(void)
163 /* Disable all interrupts/machine checks */
164 __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
165 trace_hardirqs_off();
167 /* stop all processors */
168 for_each_online_cpu(cpu) {
169 if (cpu == smp_processor_id())
172 rc = sigp(cpu, sigp_stop);
173 } while (rc == sigp_busy);
175 while (!cpu_stopped(cpu))
181 * This is the main routine where commands issued by other
185 static void do_ext_call_interrupt(unsigned int ext_int_code,
186 unsigned int param32, unsigned long param64)
190 if (ext_int_code == 0x1202)
191 kstat_cpu(smp_processor_id()).irqs[EXTINT_EXC]++;
193 kstat_cpu(smp_processor_id()).irqs[EXTINT_EMS]++;
195 * handle bit signal external calls
197 bits = xchg(&S390_lowcore.ext_call_fast, 0);
199 if (test_bit(ec_schedule, &bits))
202 if (test_bit(ec_call_function, &bits))
203 generic_smp_call_function_interrupt();
205 if (test_bit(ec_call_function_single, &bits))
206 generic_smp_call_function_single_interrupt();
210 * Send an external call sigp to another cpu and return without waiting
211 * for its completion.
213 static void smp_ext_bitcall(int cpu, int sig)
218 * Set signaling bit in lowcore of target cpu and kick it
220 set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
222 order = smp_vcpu_scheduled(cpu) ?
223 sigp_external_call : sigp_emergency_signal;
224 if (sigp(cpu, order) != sigp_busy)
230 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
234 for_each_cpu(cpu, mask)
235 smp_ext_bitcall(cpu, ec_call_function);
238 void arch_send_call_function_single_ipi(int cpu)
240 smp_ext_bitcall(cpu, ec_call_function_single);
245 * this function sends a 'purge tlb' signal to another CPU.
247 static void smp_ptlb_callback(void *info)
252 void smp_ptlb_all(void)
254 on_each_cpu(smp_ptlb_callback, NULL, 1);
256 EXPORT_SYMBOL(smp_ptlb_all);
257 #endif /* ! CONFIG_64BIT */
260 * this function sends a 'reschedule' IPI to another CPU.
261 * it goes straight through and wastes no time serializing
262 * anything. Worst case is that we lose a reschedule ...
264 void smp_send_reschedule(int cpu)
266 smp_ext_bitcall(cpu, ec_schedule);
270 * parameter area for the set/clear control bit callbacks
272 struct ec_creg_mask_parms {
273 unsigned long orvals[16];
274 unsigned long andvals[16];
278 * callback for setting/clearing control bits
280 static void smp_ctl_bit_callback(void *info)
282 struct ec_creg_mask_parms *pp = info;
283 unsigned long cregs[16];
286 __ctl_store(cregs, 0, 15);
287 for (i = 0; i <= 15; i++)
288 cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
289 __ctl_load(cregs, 0, 15);
293 * Set a bit in a control register of all cpus
295 void smp_ctl_set_bit(int cr, int bit)
297 struct ec_creg_mask_parms parms;
299 memset(&parms.orvals, 0, sizeof(parms.orvals));
300 memset(&parms.andvals, 0xff, sizeof(parms.andvals));
301 parms.orvals[cr] = 1UL << bit;
302 on_each_cpu(smp_ctl_bit_callback, &parms, 1);
304 EXPORT_SYMBOL(smp_ctl_set_bit);
307 * Clear a bit in a control register of all cpus
309 void smp_ctl_clear_bit(int cr, int bit)
311 struct ec_creg_mask_parms parms;
313 memset(&parms.orvals, 0, sizeof(parms.orvals));
314 memset(&parms.andvals, 0xff, sizeof(parms.andvals));
315 parms.andvals[cr] = ~(1UL << bit);
316 on_each_cpu(smp_ctl_bit_callback, &parms, 1);
318 EXPORT_SYMBOL(smp_ctl_clear_bit);
320 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP)
322 static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
324 if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE)
326 if (is_kdump_kernel())
328 if (cpu >= NR_CPUS) {
329 pr_warning("CPU %i exceeds the maximum %i and is excluded from "
330 "the dump\n", cpu, NR_CPUS - 1);
333 zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL);
334 while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy)
336 memcpy_real(zfcpdump_save_areas[cpu],
337 (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
338 sizeof(struct save_area));
341 struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
342 EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
346 static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { }
348 #endif /* CONFIG_ZFCPDUMP */
350 static int cpu_known(int cpu_id)
354 for_each_present_cpu(cpu) {
355 if (__cpu_logical_map[cpu] == cpu_id)
361 static int smp_rescan_cpus_sigp(cpumask_t avail)
363 int cpu_id, logical_cpu;
365 logical_cpu = cpumask_first(&avail);
366 if (logical_cpu >= nr_cpu_ids)
368 for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) {
369 if (cpu_known(cpu_id))
371 __cpu_logical_map[logical_cpu] = cpu_id;
372 smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
373 if (!cpu_stopped(logical_cpu))
375 set_cpu_present(logical_cpu, true);
376 smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
377 logical_cpu = cpumask_next(logical_cpu, &avail);
378 if (logical_cpu >= nr_cpu_ids)
384 static int smp_rescan_cpus_sclp(cpumask_t avail)
386 struct sclp_cpu_info *info;
387 int cpu_id, logical_cpu, cpu;
390 logical_cpu = cpumask_first(&avail);
391 if (logical_cpu >= nr_cpu_ids)
393 info = kmalloc(sizeof(*info), GFP_KERNEL);
396 rc = sclp_get_cpu_info(info);
399 for (cpu = 0; cpu < info->combined; cpu++) {
400 if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
402 cpu_id = info->cpu[cpu].address;
403 if (cpu_known(cpu_id))
405 __cpu_logical_map[logical_cpu] = cpu_id;
406 smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
407 set_cpu_present(logical_cpu, true);
408 if (cpu >= info->configured)
409 smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY;
411 smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
412 logical_cpu = cpumask_next(logical_cpu, &avail);
413 if (logical_cpu >= nr_cpu_ids)
421 static int __smp_rescan_cpus(void)
425 cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask);
426 if (smp_use_sigp_detection)
427 return smp_rescan_cpus_sigp(avail);
429 return smp_rescan_cpus_sclp(avail);
432 static void __init smp_detect_cpus(void)
434 unsigned int cpu, c_cpus, s_cpus;
435 struct sclp_cpu_info *info;
436 u16 boot_cpu_addr, cpu_addr;
440 boot_cpu_addr = __cpu_logical_map[0];
441 info = kmalloc(sizeof(*info), GFP_KERNEL);
443 panic("smp_detect_cpus failed to allocate memory\n");
444 #ifdef CONFIG_CRASH_DUMP
445 if (OLDMEM_BASE && !is_kdump_kernel()) {
446 struct save_area *save_area;
448 save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
450 panic("could not allocate memory for save area\n");
451 copy_oldmem_page(1, (void *) save_area, sizeof(*save_area),
453 zfcpdump_save_areas[0] = save_area;
456 /* Use sigp detection algorithm if sclp doesn't work. */
457 if (sclp_get_cpu_info(info)) {
458 smp_use_sigp_detection = 1;
459 for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) {
460 if (cpu == boot_cpu_addr)
462 if (!raw_cpu_stopped(cpu))
464 smp_get_save_area(c_cpus, cpu);
470 if (info->has_cpu_type) {
471 for (cpu = 0; cpu < info->combined; cpu++) {
472 if (info->cpu[cpu].address == boot_cpu_addr) {
473 smp_cpu_type = info->cpu[cpu].type;
479 for (cpu = 0; cpu < info->combined; cpu++) {
480 if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
482 cpu_addr = info->cpu[cpu].address;
483 if (cpu_addr == boot_cpu_addr)
485 if (!raw_cpu_stopped(cpu_addr)) {
489 smp_get_save_area(c_cpus, cpu_addr);
494 pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);
501 * Activate a secondary processor.
503 int __cpuinit start_secondary(void *cpuvoid)
511 notify_cpu_starting(smp_processor_id());
513 set_cpu_online(smp_processor_id(), true);
515 __ctl_clear_bit(0, 28); /* Disable lowcore protection */
516 S390_lowcore.restart_psw.mask =
517 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
518 S390_lowcore.restart_psw.addr =
519 PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
520 __ctl_set_bit(0, 28); /* Enable lowcore protection */
522 * Wait until the cpu which brought this one up marked it
523 * active before enabling interrupts.
525 while (!cpumask_test_cpu(smp_processor_id(), cpu_active_mask))
528 /* cpu_idle will call schedule for us */
534 struct work_struct work;
535 struct task_struct *idle;
536 struct completion done;
540 static void __cpuinit smp_fork_idle(struct work_struct *work)
542 struct create_idle *c_idle;
544 c_idle = container_of(work, struct create_idle, work);
545 c_idle->idle = fork_idle(c_idle->cpu);
546 complete(&c_idle->done);
549 static int __cpuinit smp_alloc_lowcore(int cpu)
551 unsigned long async_stack, panic_stack;
552 struct _lowcore *lowcore;
554 lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
557 async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
558 panic_stack = __get_free_page(GFP_KERNEL);
559 if (!panic_stack || !async_stack)
561 memcpy(lowcore, &S390_lowcore, 512);
562 memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
563 lowcore->async_stack = async_stack + ASYNC_SIZE;
564 lowcore->panic_stack = panic_stack + PAGE_SIZE;
565 lowcore->restart_psw.mask =
566 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
567 lowcore->restart_psw.addr =
568 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
569 if (user_mode != HOME_SPACE_MODE)
570 lowcore->restart_psw.mask |= PSW_ASC_HOME;
572 if (MACHINE_HAS_IEEE) {
573 unsigned long save_area;
575 save_area = get_zeroed_page(GFP_KERNEL);
578 lowcore->extended_save_area_addr = (u32) save_area;
581 if (vdso_alloc_per_cpu(cpu, lowcore))
584 lowcore_ptr[cpu] = lowcore;
588 free_page(panic_stack);
589 free_pages(async_stack, ASYNC_ORDER);
590 free_pages((unsigned long) lowcore, LC_ORDER);
594 static void smp_free_lowcore(int cpu)
596 struct _lowcore *lowcore;
598 lowcore = lowcore_ptr[cpu];
600 if (MACHINE_HAS_IEEE)
601 free_page((unsigned long) lowcore->extended_save_area_addr);
603 vdso_free_per_cpu(cpu, lowcore);
605 free_page(lowcore->panic_stack - PAGE_SIZE);
606 free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER);
607 free_pages((unsigned long) lowcore, LC_ORDER);
608 lowcore_ptr[cpu] = NULL;
611 /* Upping and downing of CPUs */
612 int __cpuinit __cpu_up(unsigned int cpu)
614 struct _lowcore *cpu_lowcore;
615 struct create_idle c_idle;
616 struct task_struct *idle;
617 struct stack_frame *sf;
621 if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)
623 idle = current_set[cpu];
625 c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done);
626 INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle);
628 schedule_work(&c_idle.work);
629 wait_for_completion(&c_idle.done);
630 if (IS_ERR(c_idle.idle))
631 return PTR_ERR(c_idle.idle);
633 current_set[cpu] = c_idle.idle;
635 init_idle(idle, cpu);
636 if (smp_alloc_lowcore(cpu))
639 ccode = sigp(cpu, sigp_initial_cpu_reset);
640 if (ccode == sigp_busy)
642 if (ccode == sigp_not_operational)
644 } while (ccode == sigp_busy);
646 lowcore = (u32)(unsigned long)lowcore_ptr[cpu];
647 while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)
650 cpu_lowcore = lowcore_ptr[cpu];
651 cpu_lowcore->kernel_stack = (unsigned long)
652 task_stack_page(idle) + THREAD_SIZE;
653 cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle);
654 sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
655 - sizeof(struct pt_regs)
656 - sizeof(struct stack_frame));
657 memset(sf, 0, sizeof(struct stack_frame));
658 sf->gprs[9] = (unsigned long) sf;
659 cpu_lowcore->save_area[15] = (unsigned long) sf;
660 __ctl_store(cpu_lowcore->cregs_save_area, 0, 15);
661 atomic_inc(&init_mm.context.attach_count);
664 : : "a" (&cpu_lowcore->access_regs_save_area) : "memory");
665 cpu_lowcore->percpu_offset = __per_cpu_offset[cpu];
666 cpu_lowcore->current_task = (unsigned long) idle;
667 cpu_lowcore->cpu_nr = cpu;
668 cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce;
669 cpu_lowcore->machine_flags = S390_lowcore.machine_flags;
670 cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func;
671 memcpy(cpu_lowcore->stfle_fac_list, S390_lowcore.stfle_fac_list,
675 while (sigp(cpu, sigp_restart) == sigp_busy)
678 while (!cpu_online(cpu))
683 smp_free_lowcore(cpu);
687 static int __init setup_possible_cpus(char *s)
691 pcpus = simple_strtoul(s, NULL, 0);
692 init_cpu_possible(cpumask_of(0));
693 for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++)
694 set_cpu_possible(cpu, true);
697 early_param("possible_cpus", setup_possible_cpus);
699 #ifdef CONFIG_HOTPLUG_CPU
701 int __cpu_disable(void)
703 struct ec_creg_mask_parms cr_parms;
704 int cpu = smp_processor_id();
706 set_cpu_online(cpu, false);
708 /* Disable pfault pseudo page faults on this cpu. */
711 memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals));
712 memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals));
714 /* disable all external interrupts */
715 cr_parms.orvals[0] = 0;
716 cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 11 |
717 1 << 10 | 1 << 9 | 1 << 6 | 1 << 5 |
719 /* disable all I/O interrupts */
720 cr_parms.orvals[6] = 0;
721 cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
722 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
723 /* disable most machine checks */
724 cr_parms.orvals[14] = 0;
725 cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
728 smp_ctl_bit_callback(&cr_parms);
733 void __cpu_die(unsigned int cpu)
735 /* Wait until target cpu is down */
736 while (!cpu_stopped(cpu))
738 while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy)
740 smp_free_lowcore(cpu);
741 atomic_dec(&init_mm.context.attach_count);
744 void __noreturn cpu_die(void)
747 while (sigp(smp_processor_id(), sigp_stop) == sigp_busy)
752 #endif /* CONFIG_HOTPLUG_CPU */
754 void __init smp_prepare_cpus(unsigned int max_cpus)
757 unsigned long save_area = 0;
759 unsigned long async_stack, panic_stack;
760 struct _lowcore *lowcore;
764 /* request the 0x1201 emergency signal external interrupt */
765 if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)
766 panic("Couldn't request external interrupt 0x1201");
767 /* request the 0x1202 external call external interrupt */
768 if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0)
769 panic("Couldn't request external interrupt 0x1202");
771 /* Reallocate current lowcore, but keep its contents. */
772 lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
773 panic_stack = __get_free_page(GFP_KERNEL);
774 async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
775 BUG_ON(!lowcore || !panic_stack || !async_stack);
777 if (MACHINE_HAS_IEEE)
778 save_area = get_zeroed_page(GFP_KERNEL);
781 local_mcck_disable();
782 lowcore_ptr[smp_processor_id()] = lowcore;
783 *lowcore = S390_lowcore;
784 lowcore->panic_stack = panic_stack + PAGE_SIZE;
785 lowcore->async_stack = async_stack + ASYNC_SIZE;
787 if (MACHINE_HAS_IEEE)
788 lowcore->extended_save_area_addr = (u32) save_area;
790 set_prefix((u32)(unsigned long) lowcore);
794 if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore))
799 void __init smp_prepare_boot_cpu(void)
801 BUG_ON(smp_processor_id() != 0);
803 current_thread_info()->cpu = 0;
804 set_cpu_present(0, true);
805 set_cpu_online(0, true);
806 S390_lowcore.percpu_offset = __per_cpu_offset[0];
807 current_set[0] = current;
808 smp_cpu_state[0] = CPU_STATE_CONFIGURED;
809 smp_cpu_polarization[0] = POLARIZATION_UNKNWN;
812 void __init smp_cpus_done(unsigned int max_cpus)
816 void __init smp_setup_processor_id(void)
818 S390_lowcore.cpu_nr = 0;
819 __cpu_logical_map[0] = stap();
823 * the frequency of the profiling timer can be changed
824 * by writing a multiplier value into /proc/profile.
826 * usually you want to run this on all CPUs ;)
828 int setup_profiling_timer(unsigned int multiplier)
833 #ifdef CONFIG_HOTPLUG_CPU
834 static ssize_t cpu_configure_show(struct device *dev,
835 struct device_attribute *attr, char *buf)
839 mutex_lock(&smp_cpu_state_mutex);
840 count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]);
841 mutex_unlock(&smp_cpu_state_mutex);
845 static ssize_t cpu_configure_store(struct device *dev,
846 struct device_attribute *attr,
847 const char *buf, size_t count)
853 if (sscanf(buf, "%d %c", &val, &delim) != 1)
855 if (val != 0 && val != 1)
859 mutex_lock(&smp_cpu_state_mutex);
861 /* disallow configuration changes of online cpus and cpu 0 */
862 if (cpu_online(cpu) || cpu == 0)
867 if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) {
868 rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]);
870 smp_cpu_state[cpu] = CPU_STATE_STANDBY;
871 smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
876 if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) {
877 rc = sclp_cpu_configure(__cpu_logical_map[cpu]);
879 smp_cpu_state[cpu] = CPU_STATE_CONFIGURED;
880 smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
888 mutex_unlock(&smp_cpu_state_mutex);
890 return rc ? rc : count;
892 static DEVICE_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
893 #endif /* CONFIG_HOTPLUG_CPU */
895 static ssize_t cpu_polarization_show(struct device *dev,
896 struct device_attribute *attr, char *buf)
901 mutex_lock(&smp_cpu_state_mutex);
902 switch (smp_cpu_polarization[cpu]) {
903 case POLARIZATION_HRZ:
904 count = sprintf(buf, "horizontal\n");
906 case POLARIZATION_VL:
907 count = sprintf(buf, "vertical:low\n");
909 case POLARIZATION_VM:
910 count = sprintf(buf, "vertical:medium\n");
912 case POLARIZATION_VH:
913 count = sprintf(buf, "vertical:high\n");
916 count = sprintf(buf, "unknown\n");
919 mutex_unlock(&smp_cpu_state_mutex);
922 static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
924 static ssize_t show_cpu_address(struct device *dev,
925 struct device_attribute *attr, char *buf)
927 return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]);
929 static DEVICE_ATTR(address, 0444, show_cpu_address, NULL);
932 static struct attribute *cpu_common_attrs[] = {
933 #ifdef CONFIG_HOTPLUG_CPU
934 &dev_attr_configure.attr,
936 &dev_attr_address.attr,
937 &dev_attr_polarization.attr,
941 static struct attribute_group cpu_common_attr_group = {
942 .attrs = cpu_common_attrs,
945 static ssize_t show_capability(struct device *dev,
946 struct device_attribute *attr, char *buf)
948 unsigned int capability;
951 rc = get_cpu_capability(&capability);
954 return sprintf(buf, "%u\n", capability);
956 static DEVICE_ATTR(capability, 0444, show_capability, NULL);
958 static ssize_t show_idle_count(struct device *dev,
959 struct device_attribute *attr, char *buf)
961 struct s390_idle_data *idle;
962 unsigned long long idle_count;
963 unsigned int sequence;
965 idle = &per_cpu(s390_idle, dev->id);
967 sequence = idle->sequence;
971 idle_count = idle->idle_count;
972 if (idle->idle_enter)
975 if (idle->sequence != sequence)
977 return sprintf(buf, "%llu\n", idle_count);
979 static DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL);
981 static ssize_t show_idle_time(struct device *dev,
982 struct device_attribute *attr, char *buf)
984 struct s390_idle_data *idle;
985 unsigned long long now, idle_time, idle_enter;
986 unsigned int sequence;
988 idle = &per_cpu(s390_idle, dev->id);
991 sequence = idle->sequence;
995 idle_time = idle->idle_time;
996 idle_enter = idle->idle_enter;
997 if (idle_enter != 0ULL && idle_enter < now)
998 idle_time += now - idle_enter;
1000 if (idle->sequence != sequence)
1002 return sprintf(buf, "%llu\n", idle_time >> 12);
1004 static DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
1006 static struct attribute *cpu_online_attrs[] = {
1007 &dev_attr_capability.attr,
1008 &dev_attr_idle_count.attr,
1009 &dev_attr_idle_time_us.attr,
1013 static struct attribute_group cpu_online_attr_group = {
1014 .attrs = cpu_online_attrs,
1017 static int __cpuinit smp_cpu_notify(struct notifier_block *self,
1018 unsigned long action, void *hcpu)
1020 unsigned int cpu = (unsigned int)(long)hcpu;
1021 struct cpu *c = &per_cpu(cpu_devices, cpu);
1022 struct device *s = &c->dev;
1023 struct s390_idle_data *idle;
1028 case CPU_ONLINE_FROZEN:
1029 idle = &per_cpu(s390_idle, cpu);
1030 memset(idle, 0, sizeof(struct s390_idle_data));
1031 err = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
1034 case CPU_DEAD_FROZEN:
1035 sysfs_remove_group(&s->kobj, &cpu_online_attr_group);
1038 return notifier_from_errno(err);
1041 static struct notifier_block __cpuinitdata smp_cpu_nb = {
1042 .notifier_call = smp_cpu_notify,
1045 static int __devinit smp_add_present_cpu(int cpu)
1047 struct cpu *c = &per_cpu(cpu_devices, cpu);
1048 struct device *s = &c->dev;
1051 c->hotpluggable = 1;
1052 rc = register_cpu(c, cpu);
1055 rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group);
1058 if (!cpu_online(cpu))
1060 rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
1063 sysfs_remove_group(&s->kobj, &cpu_common_attr_group);
1065 #ifdef CONFIG_HOTPLUG_CPU
1072 #ifdef CONFIG_HOTPLUG_CPU
1074 int __ref smp_rescan_cpus(void)
1081 mutex_lock(&smp_cpu_state_mutex);
1082 cpumask_copy(&newcpus, cpu_present_mask);
1083 rc = __smp_rescan_cpus();
1086 cpumask_andnot(&newcpus, cpu_present_mask, &newcpus);
1087 for_each_cpu(cpu, &newcpus) {
1088 rc = smp_add_present_cpu(cpu);
1090 set_cpu_present(cpu, false);
1094 mutex_unlock(&smp_cpu_state_mutex);
1096 if (!cpumask_empty(&newcpus))
1097 topology_schedule_update();
1101 static ssize_t __ref rescan_store(struct device *dev,
1102 struct device_attribute *attr,
1108 rc = smp_rescan_cpus();
1109 return rc ? rc : count;
1111 static DEVICE_ATTR(rescan, 0200, NULL, rescan_store);
1112 #endif /* CONFIG_HOTPLUG_CPU */
1114 static ssize_t dispatching_show(struct device *dev,
1115 struct device_attribute *attr,
1120 mutex_lock(&smp_cpu_state_mutex);
1121 count = sprintf(buf, "%d\n", cpu_management);
1122 mutex_unlock(&smp_cpu_state_mutex);
1126 static ssize_t dispatching_store(struct device *dev,
1127 struct device_attribute *attr,
1134 if (sscanf(buf, "%d %c", &val, &delim) != 1)
1136 if (val != 0 && val != 1)
1140 mutex_lock(&smp_cpu_state_mutex);
1141 if (cpu_management == val)
1143 rc = topology_set_cpu_management(val);
1145 cpu_management = val;
1147 mutex_unlock(&smp_cpu_state_mutex);
1149 return rc ? rc : count;
1151 static DEVICE_ATTR(dispatching, 0644, dispatching_show,
1154 static int __init topology_init(void)
1159 register_cpu_notifier(&smp_cpu_nb);
1161 #ifdef CONFIG_HOTPLUG_CPU
1162 rc = device_create_file(cpu_subsys.dev_root, &dev_attr_rescan);
1166 rc = device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
1169 for_each_present_cpu(cpu) {
1170 rc = smp_add_present_cpu(cpu);
1176 subsys_initcall(topology_init);