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 <asm/asm-offsets.h>
43 #include <asm/setup.h>
45 #include <asm/pgalloc.h>
47 #include <asm/s390_ext.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
));
101 void smp_switch_to_ipl_cpu(void (*func
)(void *), void *data
)
103 struct _lowcore
*lc
, *current_lc
;
104 struct stack_frame
*sf
;
105 struct pt_regs
*regs
;
108 if (smp_processor_id() == 0)
110 __load_psw_mask(PSW_BASE_BITS
| PSW_DEFAULT_KEY
);
111 /* Disable lowcore protection */
112 __ctl_clear_bit(0, 28);
113 current_lc
= lowcore_ptr
[smp_processor_id()];
117 lc
->restart_psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
118 lc
->restart_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) smp_restart_cpu
;
120 smp_switch_to_cpu(func
, data
, 0, stap(), __cpu_logical_map
[0]);
121 while (sigp(0, sigp_stop_and_store_status
) == sigp_busy
)
123 sp
= lc
->panic_stack
;
124 sp
-= sizeof(struct pt_regs
);
125 regs
= (struct pt_regs
*) sp
;
126 memcpy(®s
->gprs
, ¤t_lc
->gpregs_save_area
, sizeof(regs
->gprs
));
127 regs
->psw
= lc
->psw_save_area
;
128 sp
-= STACK_FRAME_OVERHEAD
;
129 sf
= (struct stack_frame
*) sp
;
130 sf
->back_chain
= regs
->gprs
[15];
131 smp_switch_to_cpu(func
, data
, sp
, stap(), __cpu_logical_map
[0]);
134 void smp_send_stop(void)
138 /* Disable all interrupts/machine checks */
139 __load_psw_mask(psw_kernel_bits
& ~PSW_MASK_MCHECK
);
140 trace_hardirqs_off();
142 /* stop all processors */
143 for_each_online_cpu(cpu
) {
144 if (cpu
== smp_processor_id())
147 rc
= sigp(cpu
, sigp_stop
);
148 } while (rc
== sigp_busy
);
150 while (!cpu_stopped(cpu
))
156 * This is the main routine where commands issued by other
160 static void do_ext_call_interrupt(unsigned int ext_int_code
,
161 unsigned int param32
, unsigned long param64
)
165 kstat_cpu(smp_processor_id()).irqs
[EXTINT_IPI
]++;
167 * handle bit signal external calls
169 * For the ec_schedule signal we have to do nothing. All the work
170 * is done automatically when we return from the interrupt.
172 bits
= xchg(&S390_lowcore
.ext_call_fast
, 0);
174 if (test_bit(ec_call_function
, &bits
))
175 generic_smp_call_function_interrupt();
177 if (test_bit(ec_call_function_single
, &bits
))
178 generic_smp_call_function_single_interrupt();
182 * Send an external call sigp to another cpu and return without waiting
183 * for its completion.
185 static void smp_ext_bitcall(int cpu
, int sig
)
188 * Set signaling bit in lowcore of target cpu and kick it
190 set_bit(sig
, (unsigned long *) &lowcore_ptr
[cpu
]->ext_call_fast
);
191 while (sigp(cpu
, sigp_emergency_signal
) == sigp_busy
)
195 void arch_send_call_function_ipi_mask(const struct cpumask
*mask
)
199 for_each_cpu(cpu
, mask
)
200 smp_ext_bitcall(cpu
, ec_call_function
);
203 void arch_send_call_function_single_ipi(int cpu
)
205 smp_ext_bitcall(cpu
, ec_call_function_single
);
210 * this function sends a 'purge tlb' signal to another CPU.
212 static void smp_ptlb_callback(void *info
)
217 void smp_ptlb_all(void)
219 on_each_cpu(smp_ptlb_callback
, NULL
, 1);
221 EXPORT_SYMBOL(smp_ptlb_all
);
222 #endif /* ! CONFIG_64BIT */
225 * this function sends a 'reschedule' IPI to another CPU.
226 * it goes straight through and wastes no time serializing
227 * anything. Worst case is that we lose a reschedule ...
229 void smp_send_reschedule(int cpu
)
231 smp_ext_bitcall(cpu
, ec_schedule
);
235 * parameter area for the set/clear control bit callbacks
237 struct ec_creg_mask_parms
{
238 unsigned long orvals
[16];
239 unsigned long andvals
[16];
243 * callback for setting/clearing control bits
245 static void smp_ctl_bit_callback(void *info
)
247 struct ec_creg_mask_parms
*pp
= info
;
248 unsigned long cregs
[16];
251 __ctl_store(cregs
, 0, 15);
252 for (i
= 0; i
<= 15; i
++)
253 cregs
[i
] = (cregs
[i
] & pp
->andvals
[i
]) | pp
->orvals
[i
];
254 __ctl_load(cregs
, 0, 15);
258 * Set a bit in a control register of all cpus
260 void smp_ctl_set_bit(int cr
, int bit
)
262 struct ec_creg_mask_parms parms
;
264 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
265 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
266 parms
.orvals
[cr
] = 1 << bit
;
267 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
269 EXPORT_SYMBOL(smp_ctl_set_bit
);
272 * Clear a bit in a control register of all cpus
274 void smp_ctl_clear_bit(int cr
, int bit
)
276 struct ec_creg_mask_parms parms
;
278 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
279 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
280 parms
.andvals
[cr
] = ~(1L << bit
);
281 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
283 EXPORT_SYMBOL(smp_ctl_clear_bit
);
285 #ifdef CONFIG_ZFCPDUMP
287 static void __init
smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
)
289 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
291 if (cpu
>= NR_CPUS
) {
292 pr_warning("CPU %i exceeds the maximum %i and is excluded from "
293 "the dump\n", cpu
, NR_CPUS
- 1);
296 zfcpdump_save_areas
[cpu
] = kmalloc(sizeof(struct save_area
), GFP_KERNEL
);
297 while (raw_sigp(phy_cpu
, sigp_stop_and_store_status
) == sigp_busy
)
299 memcpy_real(zfcpdump_save_areas
[cpu
],
300 (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE
,
301 sizeof(struct save_area
));
304 struct save_area
*zfcpdump_save_areas
[NR_CPUS
+ 1];
305 EXPORT_SYMBOL_GPL(zfcpdump_save_areas
);
309 static inline void smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
) { }
311 #endif /* CONFIG_ZFCPDUMP */
313 static int cpu_known(int cpu_id
)
317 for_each_present_cpu(cpu
) {
318 if (__cpu_logical_map
[cpu
] == cpu_id
)
324 static int smp_rescan_cpus_sigp(cpumask_t avail
)
326 int cpu_id
, logical_cpu
;
328 logical_cpu
= cpumask_first(&avail
);
329 if (logical_cpu
>= nr_cpu_ids
)
331 for (cpu_id
= 0; cpu_id
<= MAX_CPU_ADDRESS
; cpu_id
++) {
332 if (cpu_known(cpu_id
))
334 __cpu_logical_map
[logical_cpu
] = cpu_id
;
335 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
336 if (!cpu_stopped(logical_cpu
))
338 cpu_set(logical_cpu
, cpu_present_map
);
339 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
340 logical_cpu
= cpumask_next(logical_cpu
, &avail
);
341 if (logical_cpu
>= nr_cpu_ids
)
347 static int smp_rescan_cpus_sclp(cpumask_t avail
)
349 struct sclp_cpu_info
*info
;
350 int cpu_id
, logical_cpu
, cpu
;
353 logical_cpu
= cpumask_first(&avail
);
354 if (logical_cpu
>= nr_cpu_ids
)
356 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
359 rc
= sclp_get_cpu_info(info
);
362 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
363 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
365 cpu_id
= info
->cpu
[cpu
].address
;
366 if (cpu_known(cpu_id
))
368 __cpu_logical_map
[logical_cpu
] = cpu_id
;
369 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
370 cpu_set(logical_cpu
, cpu_present_map
);
371 if (cpu
>= info
->configured
)
372 smp_cpu_state
[logical_cpu
] = CPU_STATE_STANDBY
;
374 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
375 logical_cpu
= cpumask_next(logical_cpu
, &avail
);
376 if (logical_cpu
>= nr_cpu_ids
)
384 static int __smp_rescan_cpus(void)
388 cpus_xor(avail
, cpu_possible_map
, cpu_present_map
);
389 if (smp_use_sigp_detection
)
390 return smp_rescan_cpus_sigp(avail
);
392 return smp_rescan_cpus_sclp(avail
);
395 static void __init
smp_detect_cpus(void)
397 unsigned int cpu
, c_cpus
, s_cpus
;
398 struct sclp_cpu_info
*info
;
399 u16 boot_cpu_addr
, cpu_addr
;
403 boot_cpu_addr
= __cpu_logical_map
[0];
404 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
406 panic("smp_detect_cpus failed to allocate memory\n");
407 /* Use sigp detection algorithm if sclp doesn't work. */
408 if (sclp_get_cpu_info(info
)) {
409 smp_use_sigp_detection
= 1;
410 for (cpu
= 0; cpu
<= MAX_CPU_ADDRESS
; cpu
++) {
411 if (cpu
== boot_cpu_addr
)
413 if (!raw_cpu_stopped(cpu
))
415 smp_get_save_area(c_cpus
, cpu
);
421 if (info
->has_cpu_type
) {
422 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
423 if (info
->cpu
[cpu
].address
== boot_cpu_addr
) {
424 smp_cpu_type
= info
->cpu
[cpu
].type
;
430 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
431 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
433 cpu_addr
= info
->cpu
[cpu
].address
;
434 if (cpu_addr
== boot_cpu_addr
)
436 if (!raw_cpu_stopped(cpu_addr
)) {
440 smp_get_save_area(c_cpus
, cpu_addr
);
445 pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus
, s_cpus
);
452 * Activate a secondary processor.
454 int __cpuinit
start_secondary(void *cpuvoid
)
459 /* Enable TOD clock interrupts on the secondary cpu. */
461 /* Enable cpu timer interrupts on the secondary cpu. */
463 /* Enable pfault pseudo page faults on this cpu. */
466 /* call cpu notifiers */
467 notify_cpu_starting(smp_processor_id());
468 /* Mark this cpu as online */
470 cpu_set(smp_processor_id(), cpu_online_map
);
472 /* Switch on interrupts */
474 /* cpu_idle will call schedule for us */
480 struct work_struct work
;
481 struct task_struct
*idle
;
482 struct completion done
;
486 static void __cpuinit
smp_fork_idle(struct work_struct
*work
)
488 struct create_idle
*c_idle
;
490 c_idle
= container_of(work
, struct create_idle
, work
);
491 c_idle
->idle
= fork_idle(c_idle
->cpu
);
492 complete(&c_idle
->done
);
495 static int __cpuinit
smp_alloc_lowcore(int cpu
)
497 unsigned long async_stack
, panic_stack
;
498 struct _lowcore
*lowcore
;
500 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, LC_ORDER
);
503 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
504 panic_stack
= __get_free_page(GFP_KERNEL
);
505 if (!panic_stack
|| !async_stack
)
507 memcpy(lowcore
, &S390_lowcore
, 512);
508 memset((char *)lowcore
+ 512, 0, sizeof(*lowcore
) - 512);
509 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
510 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
513 if (MACHINE_HAS_IEEE
) {
514 unsigned long save_area
;
516 save_area
= get_zeroed_page(GFP_KERNEL
);
519 lowcore
->extended_save_area_addr
= (u32
) save_area
;
522 if (vdso_alloc_per_cpu(cpu
, lowcore
))
525 lowcore_ptr
[cpu
] = lowcore
;
529 free_page(panic_stack
);
530 free_pages(async_stack
, ASYNC_ORDER
);
531 free_pages((unsigned long) lowcore
, LC_ORDER
);
535 static void smp_free_lowcore(int cpu
)
537 struct _lowcore
*lowcore
;
539 lowcore
= lowcore_ptr
[cpu
];
541 if (MACHINE_HAS_IEEE
)
542 free_page((unsigned long) lowcore
->extended_save_area_addr
);
544 vdso_free_per_cpu(cpu
, lowcore
);
546 free_page(lowcore
->panic_stack
- PAGE_SIZE
);
547 free_pages(lowcore
->async_stack
- ASYNC_SIZE
, ASYNC_ORDER
);
548 free_pages((unsigned long) lowcore
, LC_ORDER
);
549 lowcore_ptr
[cpu
] = NULL
;
552 /* Upping and downing of CPUs */
553 int __cpuinit
__cpu_up(unsigned int cpu
)
555 struct _lowcore
*cpu_lowcore
;
556 struct create_idle c_idle
;
557 struct task_struct
*idle
;
558 struct stack_frame
*sf
;
562 if (smp_cpu_state
[cpu
] != CPU_STATE_CONFIGURED
)
564 idle
= current_set
[cpu
];
566 c_idle
.done
= COMPLETION_INITIALIZER_ONSTACK(c_idle
.done
);
567 INIT_WORK_ONSTACK(&c_idle
.work
, smp_fork_idle
);
569 schedule_work(&c_idle
.work
);
570 wait_for_completion(&c_idle
.done
);
571 if (IS_ERR(c_idle
.idle
))
572 return PTR_ERR(c_idle
.idle
);
574 current_set
[cpu
] = c_idle
.idle
;
576 init_idle(idle
, cpu
);
577 if (smp_alloc_lowcore(cpu
))
580 ccode
= sigp(cpu
, sigp_initial_cpu_reset
);
581 if (ccode
== sigp_busy
)
583 if (ccode
== sigp_not_operational
)
585 } while (ccode
== sigp_busy
);
587 lowcore
= (u32
)(unsigned long)lowcore_ptr
[cpu
];
588 while (sigp_p(lowcore
, cpu
, sigp_set_prefix
) == sigp_busy
)
591 cpu_lowcore
= lowcore_ptr
[cpu
];
592 cpu_lowcore
->kernel_stack
= (unsigned long)
593 task_stack_page(idle
) + THREAD_SIZE
;
594 cpu_lowcore
->thread_info
= (unsigned long) task_thread_info(idle
);
595 sf
= (struct stack_frame
*) (cpu_lowcore
->kernel_stack
596 - sizeof(struct pt_regs
)
597 - sizeof(struct stack_frame
));
598 memset(sf
, 0, sizeof(struct stack_frame
));
599 sf
->gprs
[9] = (unsigned long) sf
;
600 cpu_lowcore
->save_area
[15] = (unsigned long) sf
;
601 __ctl_store(cpu_lowcore
->cregs_save_area
, 0, 15);
602 atomic_inc(&init_mm
.context
.attach_count
);
605 : : "a" (&cpu_lowcore
->access_regs_save_area
) : "memory");
606 cpu_lowcore
->percpu_offset
= __per_cpu_offset
[cpu
];
607 cpu_lowcore
->current_task
= (unsigned long) idle
;
608 cpu_lowcore
->cpu_nr
= cpu
;
609 cpu_lowcore
->kernel_asce
= S390_lowcore
.kernel_asce
;
610 cpu_lowcore
->machine_flags
= S390_lowcore
.machine_flags
;
611 cpu_lowcore
->ftrace_func
= S390_lowcore
.ftrace_func
;
612 memcpy(cpu_lowcore
->stfle_fac_list
, S390_lowcore
.stfle_fac_list
,
616 while (sigp(cpu
, sigp_restart
) == sigp_busy
)
619 while (!cpu_online(cpu
))
624 smp_free_lowcore(cpu
);
628 static int __init
setup_possible_cpus(char *s
)
632 pcpus
= simple_strtoul(s
, NULL
, 0);
633 init_cpu_possible(cpumask_of(0));
634 for (cpu
= 1; cpu
< pcpus
&& cpu
< nr_cpu_ids
; cpu
++)
635 set_cpu_possible(cpu
, true);
638 early_param("possible_cpus", setup_possible_cpus
);
640 #ifdef CONFIG_HOTPLUG_CPU
642 int __cpu_disable(void)
644 struct ec_creg_mask_parms cr_parms
;
645 int cpu
= smp_processor_id();
647 cpu_clear(cpu
, cpu_online_map
);
649 /* Disable pfault pseudo page faults on this cpu. */
652 memset(&cr_parms
.orvals
, 0, sizeof(cr_parms
.orvals
));
653 memset(&cr_parms
.andvals
, 0xff, sizeof(cr_parms
.andvals
));
655 /* disable all external interrupts */
656 cr_parms
.orvals
[0] = 0;
657 cr_parms
.andvals
[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
658 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4);
659 /* disable all I/O interrupts */
660 cr_parms
.orvals
[6] = 0;
661 cr_parms
.andvals
[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
662 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
663 /* disable most machine checks */
664 cr_parms
.orvals
[14] = 0;
665 cr_parms
.andvals
[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
668 smp_ctl_bit_callback(&cr_parms
);
673 void __cpu_die(unsigned int cpu
)
675 /* Wait until target cpu is down */
676 while (!cpu_stopped(cpu
))
678 while (sigp_p(0, cpu
, sigp_set_prefix
) == sigp_busy
)
680 smp_free_lowcore(cpu
);
681 atomic_dec(&init_mm
.context
.attach_count
);
687 while (sigp(smp_processor_id(), sigp_stop
) == sigp_busy
)
692 #endif /* CONFIG_HOTPLUG_CPU */
694 void __init
smp_prepare_cpus(unsigned int max_cpus
)
697 unsigned long save_area
= 0;
699 unsigned long async_stack
, panic_stack
;
700 struct _lowcore
*lowcore
;
704 /* request the 0x1201 emergency signal external interrupt */
705 if (register_external_interrupt(0x1201, do_ext_call_interrupt
) != 0)
706 panic("Couldn't request external interrupt 0x1201");
708 /* Reallocate current lowcore, but keep its contents. */
709 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, LC_ORDER
);
710 panic_stack
= __get_free_page(GFP_KERNEL
);
711 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
712 BUG_ON(!lowcore
|| !panic_stack
|| !async_stack
);
714 if (MACHINE_HAS_IEEE
)
715 save_area
= get_zeroed_page(GFP_KERNEL
);
718 local_mcck_disable();
719 lowcore_ptr
[smp_processor_id()] = lowcore
;
720 *lowcore
= S390_lowcore
;
721 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
722 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
724 if (MACHINE_HAS_IEEE
)
725 lowcore
->extended_save_area_addr
= (u32
) save_area
;
727 set_prefix((u32
)(unsigned long) lowcore
);
731 if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore
))
736 void __init
smp_prepare_boot_cpu(void)
738 BUG_ON(smp_processor_id() != 0);
740 current_thread_info()->cpu
= 0;
741 cpu_set(0, cpu_present_map
);
742 cpu_set(0, cpu_online_map
);
743 S390_lowcore
.percpu_offset
= __per_cpu_offset
[0];
744 current_set
[0] = current
;
745 smp_cpu_state
[0] = CPU_STATE_CONFIGURED
;
746 smp_cpu_polarization
[0] = POLARIZATION_UNKNWN
;
749 void __init
smp_cpus_done(unsigned int max_cpus
)
753 void __init
smp_setup_processor_id(void)
755 S390_lowcore
.cpu_nr
= 0;
756 __cpu_logical_map
[0] = stap();
760 * the frequency of the profiling timer can be changed
761 * by writing a multiplier value into /proc/profile.
763 * usually you want to run this on all CPUs ;)
765 int setup_profiling_timer(unsigned int multiplier
)
770 #ifdef CONFIG_HOTPLUG_CPU
771 static ssize_t
cpu_configure_show(struct sys_device
*dev
,
772 struct sysdev_attribute
*attr
, char *buf
)
776 mutex_lock(&smp_cpu_state_mutex
);
777 count
= sprintf(buf
, "%d\n", smp_cpu_state
[dev
->id
]);
778 mutex_unlock(&smp_cpu_state_mutex
);
782 static ssize_t
cpu_configure_store(struct sys_device
*dev
,
783 struct sysdev_attribute
*attr
,
784 const char *buf
, size_t count
)
790 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
792 if (val
!= 0 && val
!= 1)
796 mutex_lock(&smp_cpu_state_mutex
);
798 /* disallow configuration changes of online cpus and cpu 0 */
799 if (cpu_online(cpu
) || cpu
== 0)
804 if (smp_cpu_state
[cpu
] == CPU_STATE_CONFIGURED
) {
805 rc
= sclp_cpu_deconfigure(__cpu_logical_map
[cpu
]);
807 smp_cpu_state
[cpu
] = CPU_STATE_STANDBY
;
808 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
813 if (smp_cpu_state
[cpu
] == CPU_STATE_STANDBY
) {
814 rc
= sclp_cpu_configure(__cpu_logical_map
[cpu
]);
816 smp_cpu_state
[cpu
] = CPU_STATE_CONFIGURED
;
817 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
825 mutex_unlock(&smp_cpu_state_mutex
);
827 return rc
? rc
: count
;
829 static SYSDEV_ATTR(configure
, 0644, cpu_configure_show
, cpu_configure_store
);
830 #endif /* CONFIG_HOTPLUG_CPU */
832 static ssize_t
cpu_polarization_show(struct sys_device
*dev
,
833 struct sysdev_attribute
*attr
, char *buf
)
838 mutex_lock(&smp_cpu_state_mutex
);
839 switch (smp_cpu_polarization
[cpu
]) {
840 case POLARIZATION_HRZ
:
841 count
= sprintf(buf
, "horizontal\n");
843 case POLARIZATION_VL
:
844 count
= sprintf(buf
, "vertical:low\n");
846 case POLARIZATION_VM
:
847 count
= sprintf(buf
, "vertical:medium\n");
849 case POLARIZATION_VH
:
850 count
= sprintf(buf
, "vertical:high\n");
853 count
= sprintf(buf
, "unknown\n");
856 mutex_unlock(&smp_cpu_state_mutex
);
859 static SYSDEV_ATTR(polarization
, 0444, cpu_polarization_show
, NULL
);
861 static ssize_t
show_cpu_address(struct sys_device
*dev
,
862 struct sysdev_attribute
*attr
, char *buf
)
864 return sprintf(buf
, "%d\n", __cpu_logical_map
[dev
->id
]);
866 static SYSDEV_ATTR(address
, 0444, show_cpu_address
, NULL
);
869 static struct attribute
*cpu_common_attrs
[] = {
870 #ifdef CONFIG_HOTPLUG_CPU
871 &attr_configure
.attr
,
874 &attr_polarization
.attr
,
878 static struct attribute_group cpu_common_attr_group
= {
879 .attrs
= cpu_common_attrs
,
882 static ssize_t
show_capability(struct sys_device
*dev
,
883 struct sysdev_attribute
*attr
, char *buf
)
885 unsigned int capability
;
888 rc
= get_cpu_capability(&capability
);
891 return sprintf(buf
, "%u\n", capability
);
893 static SYSDEV_ATTR(capability
, 0444, show_capability
, NULL
);
895 static ssize_t
show_idle_count(struct sys_device
*dev
,
896 struct sysdev_attribute
*attr
, char *buf
)
898 struct s390_idle_data
*idle
;
899 unsigned long long idle_count
;
900 unsigned int sequence
;
902 idle
= &per_cpu(s390_idle
, dev
->id
);
904 sequence
= idle
->sequence
;
908 idle_count
= idle
->idle_count
;
909 if (idle
->idle_enter
)
912 if (idle
->sequence
!= sequence
)
914 return sprintf(buf
, "%llu\n", idle_count
);
916 static SYSDEV_ATTR(idle_count
, 0444, show_idle_count
, NULL
);
918 static ssize_t
show_idle_time(struct sys_device
*dev
,
919 struct sysdev_attribute
*attr
, char *buf
)
921 struct s390_idle_data
*idle
;
922 unsigned long long now
, idle_time
, idle_enter
;
923 unsigned int sequence
;
925 idle
= &per_cpu(s390_idle
, dev
->id
);
928 sequence
= idle
->sequence
;
932 idle_time
= idle
->idle_time
;
933 idle_enter
= idle
->idle_enter
;
934 if (idle_enter
!= 0ULL && idle_enter
< now
)
935 idle_time
+= now
- idle_enter
;
937 if (idle
->sequence
!= sequence
)
939 return sprintf(buf
, "%llu\n", idle_time
>> 12);
941 static SYSDEV_ATTR(idle_time_us
, 0444, show_idle_time
, NULL
);
943 static struct attribute
*cpu_online_attrs
[] = {
944 &attr_capability
.attr
,
945 &attr_idle_count
.attr
,
946 &attr_idle_time_us
.attr
,
950 static struct attribute_group cpu_online_attr_group
= {
951 .attrs
= cpu_online_attrs
,
954 static int __cpuinit
smp_cpu_notify(struct notifier_block
*self
,
955 unsigned long action
, void *hcpu
)
957 unsigned int cpu
= (unsigned int)(long)hcpu
;
958 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
959 struct sys_device
*s
= &c
->sysdev
;
960 struct s390_idle_data
*idle
;
965 case CPU_ONLINE_FROZEN
:
966 idle
= &per_cpu(s390_idle
, cpu
);
967 memset(idle
, 0, sizeof(struct s390_idle_data
));
968 err
= sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
);
971 case CPU_DEAD_FROZEN
:
972 sysfs_remove_group(&s
->kobj
, &cpu_online_attr_group
);
975 return notifier_from_errno(err
);
978 static struct notifier_block __cpuinitdata smp_cpu_nb
= {
979 .notifier_call
= smp_cpu_notify
,
982 static int __devinit
smp_add_present_cpu(int cpu
)
984 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
985 struct sys_device
*s
= &c
->sysdev
;
989 rc
= register_cpu(c
, cpu
);
992 rc
= sysfs_create_group(&s
->kobj
, &cpu_common_attr_group
);
995 if (!cpu_online(cpu
))
997 rc
= sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
);
1000 sysfs_remove_group(&s
->kobj
, &cpu_common_attr_group
);
1002 #ifdef CONFIG_HOTPLUG_CPU
1009 #ifdef CONFIG_HOTPLUG_CPU
1011 int __ref
smp_rescan_cpus(void)
1018 mutex_lock(&smp_cpu_state_mutex
);
1019 newcpus
= cpu_present_map
;
1020 rc
= __smp_rescan_cpus();
1023 cpus_andnot(newcpus
, cpu_present_map
, newcpus
);
1024 for_each_cpu_mask(cpu
, newcpus
) {
1025 rc
= smp_add_present_cpu(cpu
);
1027 cpu_clear(cpu
, cpu_present_map
);
1031 mutex_unlock(&smp_cpu_state_mutex
);
1033 if (!cpus_empty(newcpus
))
1034 topology_schedule_update();
1038 static ssize_t __ref
rescan_store(struct sysdev_class
*class,
1039 struct sysdev_class_attribute
*attr
,
1045 rc
= smp_rescan_cpus();
1046 return rc
? rc
: count
;
1048 static SYSDEV_CLASS_ATTR(rescan
, 0200, NULL
, rescan_store
);
1049 #endif /* CONFIG_HOTPLUG_CPU */
1051 static ssize_t
dispatching_show(struct sysdev_class
*class,
1052 struct sysdev_class_attribute
*attr
,
1057 mutex_lock(&smp_cpu_state_mutex
);
1058 count
= sprintf(buf
, "%d\n", cpu_management
);
1059 mutex_unlock(&smp_cpu_state_mutex
);
1063 static ssize_t
dispatching_store(struct sysdev_class
*dev
,
1064 struct sysdev_class_attribute
*attr
,
1071 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
1073 if (val
!= 0 && val
!= 1)
1077 mutex_lock(&smp_cpu_state_mutex
);
1078 if (cpu_management
== val
)
1080 rc
= topology_set_cpu_management(val
);
1082 cpu_management
= val
;
1084 mutex_unlock(&smp_cpu_state_mutex
);
1086 return rc
? rc
: count
;
1088 static SYSDEV_CLASS_ATTR(dispatching
, 0644, dispatching_show
,
1091 static int __init
topology_init(void)
1096 register_cpu_notifier(&smp_cpu_nb
);
1098 #ifdef CONFIG_HOTPLUG_CPU
1099 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_rescan
);
1103 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_dispatching
);
1106 for_each_present_cpu(cpu
) {
1107 rc
= smp_add_present_cpu(cpu
);
1113 subsys_initcall(topology_init
);