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/cpcmd.h>
48 #include <asm/tlbflush.h>
49 #include <asm/timer.h>
50 #include <asm/lowcore.h>
52 #include <asm/cputime.h>
57 /* logical cpu to cpu address */
58 unsigned short __cpu_logical_map
[NR_CPUS
];
60 static struct task_struct
*current_set
[NR_CPUS
];
62 static u8 smp_cpu_type
;
63 static int smp_use_sigp_detection
;
70 DEFINE_MUTEX(smp_cpu_state_mutex
);
71 int smp_cpu_polarization
[NR_CPUS
];
72 static int smp_cpu_state
[NR_CPUS
];
73 static int cpu_management
;
75 static DEFINE_PER_CPU(struct cpu
, cpu_devices
);
77 static void smp_ext_bitcall(int, int);
79 static int raw_cpu_stopped(int cpu
)
83 switch (raw_sigp_ps(&status
, 0, cpu
, sigp_sense
)) {
84 case sigp_status_stored
:
85 /* Check for stopped and check stop state */
95 static inline int cpu_stopped(int cpu
)
97 return raw_cpu_stopped(cpu_logical_map(cpu
));
100 void smp_switch_to_ipl_cpu(void (*func
)(void *), void *data
)
102 struct _lowcore
*lc
, *current_lc
;
103 struct stack_frame
*sf
;
104 struct pt_regs
*regs
;
107 if (smp_processor_id() == 0)
109 __load_psw_mask(PSW_BASE_BITS
| PSW_DEFAULT_KEY
);
110 /* Disable lowcore protection */
111 __ctl_clear_bit(0, 28);
112 current_lc
= lowcore_ptr
[smp_processor_id()];
116 lc
->restart_psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
117 lc
->restart_psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) smp_restart_cpu
;
119 smp_switch_to_cpu(func
, data
, 0, stap(), __cpu_logical_map
[0]);
120 while (sigp(0, sigp_stop_and_store_status
) == sigp_busy
)
122 sp
= lc
->panic_stack
;
123 sp
-= sizeof(struct pt_regs
);
124 regs
= (struct pt_regs
*) sp
;
125 memcpy(®s
->gprs
, ¤t_lc
->gpregs_save_area
, sizeof(regs
->gprs
));
126 regs
->psw
= lc
->psw_save_area
;
127 sp
-= STACK_FRAME_OVERHEAD
;
128 sf
= (struct stack_frame
*) sp
;
129 sf
->back_chain
= regs
->gprs
[15];
130 smp_switch_to_cpu(func
, data
, sp
, stap(), __cpu_logical_map
[0]);
133 void smp_send_stop(void)
137 /* Disable all interrupts/machine checks */
138 __load_psw_mask(psw_kernel_bits
& ~PSW_MASK_MCHECK
);
139 trace_hardirqs_off();
141 /* stop all processors */
142 for_each_online_cpu(cpu
) {
143 if (cpu
== smp_processor_id())
146 rc
= sigp(cpu
, sigp_stop
);
147 } while (rc
== sigp_busy
);
149 while (!cpu_stopped(cpu
))
155 * This is the main routine where commands issued by other
159 static void do_ext_call_interrupt(unsigned int ext_int_code
,
160 unsigned int param32
, unsigned long param64
)
164 kstat_cpu(smp_processor_id()).irqs
[EXTINT_IPI
]++;
166 * handle bit signal external calls
168 bits
= xchg(&S390_lowcore
.ext_call_fast
, 0);
170 if (test_bit(ec_schedule
, &bits
))
173 if (test_bit(ec_call_function
, &bits
))
174 generic_smp_call_function_interrupt();
176 if (test_bit(ec_call_function_single
, &bits
))
177 generic_smp_call_function_single_interrupt();
181 * Send an external call sigp to another cpu and return without waiting
182 * for its completion.
184 static void smp_ext_bitcall(int cpu
, int sig
)
187 * Set signaling bit in lowcore of target cpu and kick it
189 set_bit(sig
, (unsigned long *) &lowcore_ptr
[cpu
]->ext_call_fast
);
190 while (sigp(cpu
, sigp_emergency_signal
) == sigp_busy
)
194 void arch_send_call_function_ipi_mask(const struct cpumask
*mask
)
198 for_each_cpu(cpu
, mask
)
199 smp_ext_bitcall(cpu
, ec_call_function
);
202 void arch_send_call_function_single_ipi(int cpu
)
204 smp_ext_bitcall(cpu
, ec_call_function_single
);
209 * this function sends a 'purge tlb' signal to another CPU.
211 static void smp_ptlb_callback(void *info
)
216 void smp_ptlb_all(void)
218 on_each_cpu(smp_ptlb_callback
, NULL
, 1);
220 EXPORT_SYMBOL(smp_ptlb_all
);
221 #endif /* ! CONFIG_64BIT */
224 * this function sends a 'reschedule' IPI to another CPU.
225 * it goes straight through and wastes no time serializing
226 * anything. Worst case is that we lose a reschedule ...
228 void smp_send_reschedule(int cpu
)
230 smp_ext_bitcall(cpu
, ec_schedule
);
234 * parameter area for the set/clear control bit callbacks
236 struct ec_creg_mask_parms
{
237 unsigned long orvals
[16];
238 unsigned long andvals
[16];
242 * callback for setting/clearing control bits
244 static void smp_ctl_bit_callback(void *info
)
246 struct ec_creg_mask_parms
*pp
= info
;
247 unsigned long cregs
[16];
250 __ctl_store(cregs
, 0, 15);
251 for (i
= 0; i
<= 15; i
++)
252 cregs
[i
] = (cregs
[i
] & pp
->andvals
[i
]) | pp
->orvals
[i
];
253 __ctl_load(cregs
, 0, 15);
257 * Set a bit in a control register of all cpus
259 void smp_ctl_set_bit(int cr
, int bit
)
261 struct ec_creg_mask_parms parms
;
263 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
264 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
265 parms
.orvals
[cr
] = 1UL << bit
;
266 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
268 EXPORT_SYMBOL(smp_ctl_set_bit
);
271 * Clear a bit in a control register of all cpus
273 void smp_ctl_clear_bit(int cr
, int bit
)
275 struct ec_creg_mask_parms parms
;
277 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
278 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
279 parms
.andvals
[cr
] = ~(1UL << bit
);
280 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
282 EXPORT_SYMBOL(smp_ctl_clear_bit
);
284 #ifdef CONFIG_ZFCPDUMP
286 static void __init
smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
)
288 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
290 if (cpu
>= NR_CPUS
) {
291 pr_warning("CPU %i exceeds the maximum %i and is excluded from "
292 "the dump\n", cpu
, NR_CPUS
- 1);
295 zfcpdump_save_areas
[cpu
] = kmalloc(sizeof(struct save_area
), GFP_KERNEL
);
296 while (raw_sigp(phy_cpu
, sigp_stop_and_store_status
) == sigp_busy
)
298 memcpy_real(zfcpdump_save_areas
[cpu
],
299 (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE
,
300 sizeof(struct save_area
));
303 struct save_area
*zfcpdump_save_areas
[NR_CPUS
+ 1];
304 EXPORT_SYMBOL_GPL(zfcpdump_save_areas
);
308 static inline void smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
) { }
310 #endif /* CONFIG_ZFCPDUMP */
312 static int cpu_known(int cpu_id
)
316 for_each_present_cpu(cpu
) {
317 if (__cpu_logical_map
[cpu
] == cpu_id
)
323 static int smp_rescan_cpus_sigp(cpumask_t avail
)
325 int cpu_id
, logical_cpu
;
327 logical_cpu
= cpumask_first(&avail
);
328 if (logical_cpu
>= nr_cpu_ids
)
330 for (cpu_id
= 0; cpu_id
<= MAX_CPU_ADDRESS
; cpu_id
++) {
331 if (cpu_known(cpu_id
))
333 __cpu_logical_map
[logical_cpu
] = cpu_id
;
334 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
335 if (!cpu_stopped(logical_cpu
))
337 set_cpu_present(logical_cpu
, true);
338 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
339 logical_cpu
= cpumask_next(logical_cpu
, &avail
);
340 if (logical_cpu
>= nr_cpu_ids
)
346 static int smp_rescan_cpus_sclp(cpumask_t avail
)
348 struct sclp_cpu_info
*info
;
349 int cpu_id
, logical_cpu
, cpu
;
352 logical_cpu
= cpumask_first(&avail
);
353 if (logical_cpu
>= nr_cpu_ids
)
355 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
358 rc
= sclp_get_cpu_info(info
);
361 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
362 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
364 cpu_id
= info
->cpu
[cpu
].address
;
365 if (cpu_known(cpu_id
))
367 __cpu_logical_map
[logical_cpu
] = cpu_id
;
368 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
369 set_cpu_present(logical_cpu
, true);
370 if (cpu
>= info
->configured
)
371 smp_cpu_state
[logical_cpu
] = CPU_STATE_STANDBY
;
373 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
374 logical_cpu
= cpumask_next(logical_cpu
, &avail
);
375 if (logical_cpu
>= nr_cpu_ids
)
383 static int __smp_rescan_cpus(void)
387 cpumask_xor(&avail
, cpu_possible_mask
, cpu_present_mask
);
388 if (smp_use_sigp_detection
)
389 return smp_rescan_cpus_sigp(avail
);
391 return smp_rescan_cpus_sclp(avail
);
394 static void __init
smp_detect_cpus(void)
396 unsigned int cpu
, c_cpus
, s_cpus
;
397 struct sclp_cpu_info
*info
;
398 u16 boot_cpu_addr
, cpu_addr
;
402 boot_cpu_addr
= __cpu_logical_map
[0];
403 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
405 panic("smp_detect_cpus failed to allocate memory\n");
406 /* Use sigp detection algorithm if sclp doesn't work. */
407 if (sclp_get_cpu_info(info
)) {
408 smp_use_sigp_detection
= 1;
409 for (cpu
= 0; cpu
<= MAX_CPU_ADDRESS
; cpu
++) {
410 if (cpu
== boot_cpu_addr
)
412 if (!raw_cpu_stopped(cpu
))
414 smp_get_save_area(c_cpus
, cpu
);
420 if (info
->has_cpu_type
) {
421 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
422 if (info
->cpu
[cpu
].address
== boot_cpu_addr
) {
423 smp_cpu_type
= info
->cpu
[cpu
].type
;
429 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
430 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
432 cpu_addr
= info
->cpu
[cpu
].address
;
433 if (cpu_addr
== boot_cpu_addr
)
435 if (!raw_cpu_stopped(cpu_addr
)) {
439 smp_get_save_area(c_cpus
, cpu_addr
);
444 pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus
, s_cpus
);
451 * Activate a secondary processor.
453 int __cpuinit
start_secondary(void *cpuvoid
)
458 /* Enable TOD clock interrupts on the secondary cpu. */
460 /* Enable cpu timer interrupts on the secondary cpu. */
462 /* Enable pfault pseudo page faults on this cpu. */
465 /* call cpu notifiers */
466 notify_cpu_starting(smp_processor_id());
467 /* Mark this cpu as online */
469 set_cpu_online(smp_processor_id(), true);
471 /* Switch on interrupts */
473 /* cpu_idle will call schedule for us */
479 struct work_struct work
;
480 struct task_struct
*idle
;
481 struct completion done
;
485 static void __cpuinit
smp_fork_idle(struct work_struct
*work
)
487 struct create_idle
*c_idle
;
489 c_idle
= container_of(work
, struct create_idle
, work
);
490 c_idle
->idle
= fork_idle(c_idle
->cpu
);
491 complete(&c_idle
->done
);
494 static int __cpuinit
smp_alloc_lowcore(int cpu
)
496 unsigned long async_stack
, panic_stack
;
497 struct _lowcore
*lowcore
;
499 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, LC_ORDER
);
502 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
503 panic_stack
= __get_free_page(GFP_KERNEL
);
504 if (!panic_stack
|| !async_stack
)
506 memcpy(lowcore
, &S390_lowcore
, 512);
507 memset((char *)lowcore
+ 512, 0, sizeof(*lowcore
) - 512);
508 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
509 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
512 if (MACHINE_HAS_IEEE
) {
513 unsigned long save_area
;
515 save_area
= get_zeroed_page(GFP_KERNEL
);
518 lowcore
->extended_save_area_addr
= (u32
) save_area
;
521 if (vdso_alloc_per_cpu(cpu
, lowcore
))
524 lowcore_ptr
[cpu
] = lowcore
;
528 free_page(panic_stack
);
529 free_pages(async_stack
, ASYNC_ORDER
);
530 free_pages((unsigned long) lowcore
, LC_ORDER
);
534 static void smp_free_lowcore(int cpu
)
536 struct _lowcore
*lowcore
;
538 lowcore
= lowcore_ptr
[cpu
];
540 if (MACHINE_HAS_IEEE
)
541 free_page((unsigned long) lowcore
->extended_save_area_addr
);
543 vdso_free_per_cpu(cpu
, lowcore
);
545 free_page(lowcore
->panic_stack
- PAGE_SIZE
);
546 free_pages(lowcore
->async_stack
- ASYNC_SIZE
, ASYNC_ORDER
);
547 free_pages((unsigned long) lowcore
, LC_ORDER
);
548 lowcore_ptr
[cpu
] = NULL
;
551 /* Upping and downing of CPUs */
552 int __cpuinit
__cpu_up(unsigned int cpu
)
554 struct _lowcore
*cpu_lowcore
;
555 struct create_idle c_idle
;
556 struct task_struct
*idle
;
557 struct stack_frame
*sf
;
561 if (smp_cpu_state
[cpu
] != CPU_STATE_CONFIGURED
)
563 idle
= current_set
[cpu
];
565 c_idle
.done
= COMPLETION_INITIALIZER_ONSTACK(c_idle
.done
);
566 INIT_WORK_ONSTACK(&c_idle
.work
, smp_fork_idle
);
568 schedule_work(&c_idle
.work
);
569 wait_for_completion(&c_idle
.done
);
570 if (IS_ERR(c_idle
.idle
))
571 return PTR_ERR(c_idle
.idle
);
573 current_set
[cpu
] = c_idle
.idle
;
575 init_idle(idle
, cpu
);
576 if (smp_alloc_lowcore(cpu
))
579 ccode
= sigp(cpu
, sigp_initial_cpu_reset
);
580 if (ccode
== sigp_busy
)
582 if (ccode
== sigp_not_operational
)
584 } while (ccode
== sigp_busy
);
586 lowcore
= (u32
)(unsigned long)lowcore_ptr
[cpu
];
587 while (sigp_p(lowcore
, cpu
, sigp_set_prefix
) == sigp_busy
)
590 cpu_lowcore
= lowcore_ptr
[cpu
];
591 cpu_lowcore
->kernel_stack
= (unsigned long)
592 task_stack_page(idle
) + THREAD_SIZE
;
593 cpu_lowcore
->thread_info
= (unsigned long) task_thread_info(idle
);
594 sf
= (struct stack_frame
*) (cpu_lowcore
->kernel_stack
595 - sizeof(struct pt_regs
)
596 - sizeof(struct stack_frame
));
597 memset(sf
, 0, sizeof(struct stack_frame
));
598 sf
->gprs
[9] = (unsigned long) sf
;
599 cpu_lowcore
->save_area
[15] = (unsigned long) sf
;
600 __ctl_store(cpu_lowcore
->cregs_save_area
, 0, 15);
601 atomic_inc(&init_mm
.context
.attach_count
);
604 : : "a" (&cpu_lowcore
->access_regs_save_area
) : "memory");
605 cpu_lowcore
->percpu_offset
= __per_cpu_offset
[cpu
];
606 cpu_lowcore
->current_task
= (unsigned long) idle
;
607 cpu_lowcore
->cpu_nr
= cpu
;
608 cpu_lowcore
->kernel_asce
= S390_lowcore
.kernel_asce
;
609 cpu_lowcore
->machine_flags
= S390_lowcore
.machine_flags
;
610 cpu_lowcore
->ftrace_func
= S390_lowcore
.ftrace_func
;
611 memcpy(cpu_lowcore
->stfle_fac_list
, S390_lowcore
.stfle_fac_list
,
615 while (sigp(cpu
, sigp_restart
) == sigp_busy
)
618 while (!cpu_online(cpu
))
623 smp_free_lowcore(cpu
);
627 static int __init
setup_possible_cpus(char *s
)
631 pcpus
= simple_strtoul(s
, NULL
, 0);
632 init_cpu_possible(cpumask_of(0));
633 for (cpu
= 1; cpu
< pcpus
&& cpu
< nr_cpu_ids
; cpu
++)
634 set_cpu_possible(cpu
, true);
637 early_param("possible_cpus", setup_possible_cpus
);
639 #ifdef CONFIG_HOTPLUG_CPU
641 int __cpu_disable(void)
643 struct ec_creg_mask_parms cr_parms
;
644 int cpu
= smp_processor_id();
646 set_cpu_online(cpu
, false);
648 /* Disable pfault pseudo page faults on this cpu. */
651 memset(&cr_parms
.orvals
, 0, sizeof(cr_parms
.orvals
));
652 memset(&cr_parms
.andvals
, 0xff, sizeof(cr_parms
.andvals
));
654 /* disable all external interrupts */
655 cr_parms
.orvals
[0] = 0;
656 cr_parms
.andvals
[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 11 |
657 1 << 10 | 1 << 9 | 1 << 6 | 1 << 4);
658 /* disable all I/O interrupts */
659 cr_parms
.orvals
[6] = 0;
660 cr_parms
.andvals
[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
661 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
662 /* disable most machine checks */
663 cr_parms
.orvals
[14] = 0;
664 cr_parms
.andvals
[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
667 smp_ctl_bit_callback(&cr_parms
);
672 void __cpu_die(unsigned int cpu
)
674 /* Wait until target cpu is down */
675 while (!cpu_stopped(cpu
))
677 while (sigp_p(0, cpu
, sigp_set_prefix
) == sigp_busy
)
679 smp_free_lowcore(cpu
);
680 atomic_dec(&init_mm
.context
.attach_count
);
683 void __noreturn
cpu_die(void)
686 while (sigp(smp_processor_id(), sigp_stop
) == sigp_busy
)
691 #endif /* CONFIG_HOTPLUG_CPU */
693 void __init
smp_prepare_cpus(unsigned int max_cpus
)
696 unsigned long save_area
= 0;
698 unsigned long async_stack
, panic_stack
;
699 struct _lowcore
*lowcore
;
703 /* request the 0x1201 emergency signal external interrupt */
704 if (register_external_interrupt(0x1201, do_ext_call_interrupt
) != 0)
705 panic("Couldn't request external interrupt 0x1201");
707 /* Reallocate current lowcore, but keep its contents. */
708 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, LC_ORDER
);
709 panic_stack
= __get_free_page(GFP_KERNEL
);
710 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
711 BUG_ON(!lowcore
|| !panic_stack
|| !async_stack
);
713 if (MACHINE_HAS_IEEE
)
714 save_area
= get_zeroed_page(GFP_KERNEL
);
717 local_mcck_disable();
718 lowcore_ptr
[smp_processor_id()] = lowcore
;
719 *lowcore
= S390_lowcore
;
720 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
721 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
723 if (MACHINE_HAS_IEEE
)
724 lowcore
->extended_save_area_addr
= (u32
) save_area
;
726 set_prefix((u32
)(unsigned long) lowcore
);
730 if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore
))
735 void __init
smp_prepare_boot_cpu(void)
737 BUG_ON(smp_processor_id() != 0);
739 current_thread_info()->cpu
= 0;
740 set_cpu_present(0, true);
741 set_cpu_online(0, true);
742 S390_lowcore
.percpu_offset
= __per_cpu_offset
[0];
743 current_set
[0] = current
;
744 smp_cpu_state
[0] = CPU_STATE_CONFIGURED
;
745 smp_cpu_polarization
[0] = POLARIZATION_UNKNWN
;
748 void __init
smp_cpus_done(unsigned int max_cpus
)
752 void __init
smp_setup_processor_id(void)
754 S390_lowcore
.cpu_nr
= 0;
755 __cpu_logical_map
[0] = stap();
759 * the frequency of the profiling timer can be changed
760 * by writing a multiplier value into /proc/profile.
762 * usually you want to run this on all CPUs ;)
764 int setup_profiling_timer(unsigned int multiplier
)
769 #ifdef CONFIG_HOTPLUG_CPU
770 static ssize_t
cpu_configure_show(struct sys_device
*dev
,
771 struct sysdev_attribute
*attr
, char *buf
)
775 mutex_lock(&smp_cpu_state_mutex
);
776 count
= sprintf(buf
, "%d\n", smp_cpu_state
[dev
->id
]);
777 mutex_unlock(&smp_cpu_state_mutex
);
781 static ssize_t
cpu_configure_store(struct sys_device
*dev
,
782 struct sysdev_attribute
*attr
,
783 const char *buf
, size_t count
)
789 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
791 if (val
!= 0 && val
!= 1)
795 mutex_lock(&smp_cpu_state_mutex
);
797 /* disallow configuration changes of online cpus and cpu 0 */
798 if (cpu_online(cpu
) || cpu
== 0)
803 if (smp_cpu_state
[cpu
] == CPU_STATE_CONFIGURED
) {
804 rc
= sclp_cpu_deconfigure(__cpu_logical_map
[cpu
]);
806 smp_cpu_state
[cpu
] = CPU_STATE_STANDBY
;
807 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
812 if (smp_cpu_state
[cpu
] == CPU_STATE_STANDBY
) {
813 rc
= sclp_cpu_configure(__cpu_logical_map
[cpu
]);
815 smp_cpu_state
[cpu
] = CPU_STATE_CONFIGURED
;
816 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
824 mutex_unlock(&smp_cpu_state_mutex
);
826 return rc
? rc
: count
;
828 static SYSDEV_ATTR(configure
, 0644, cpu_configure_show
, cpu_configure_store
);
829 #endif /* CONFIG_HOTPLUG_CPU */
831 static ssize_t
cpu_polarization_show(struct sys_device
*dev
,
832 struct sysdev_attribute
*attr
, char *buf
)
837 mutex_lock(&smp_cpu_state_mutex
);
838 switch (smp_cpu_polarization
[cpu
]) {
839 case POLARIZATION_HRZ
:
840 count
= sprintf(buf
, "horizontal\n");
842 case POLARIZATION_VL
:
843 count
= sprintf(buf
, "vertical:low\n");
845 case POLARIZATION_VM
:
846 count
= sprintf(buf
, "vertical:medium\n");
848 case POLARIZATION_VH
:
849 count
= sprintf(buf
, "vertical:high\n");
852 count
= sprintf(buf
, "unknown\n");
855 mutex_unlock(&smp_cpu_state_mutex
);
858 static SYSDEV_ATTR(polarization
, 0444, cpu_polarization_show
, NULL
);
860 static ssize_t
show_cpu_address(struct sys_device
*dev
,
861 struct sysdev_attribute
*attr
, char *buf
)
863 return sprintf(buf
, "%d\n", __cpu_logical_map
[dev
->id
]);
865 static SYSDEV_ATTR(address
, 0444, show_cpu_address
, NULL
);
868 static struct attribute
*cpu_common_attrs
[] = {
869 #ifdef CONFIG_HOTPLUG_CPU
870 &attr_configure
.attr
,
873 &attr_polarization
.attr
,
877 static struct attribute_group cpu_common_attr_group
= {
878 .attrs
= cpu_common_attrs
,
881 static ssize_t
show_capability(struct sys_device
*dev
,
882 struct sysdev_attribute
*attr
, char *buf
)
884 unsigned int capability
;
887 rc
= get_cpu_capability(&capability
);
890 return sprintf(buf
, "%u\n", capability
);
892 static SYSDEV_ATTR(capability
, 0444, show_capability
, NULL
);
894 static ssize_t
show_idle_count(struct sys_device
*dev
,
895 struct sysdev_attribute
*attr
, char *buf
)
897 struct s390_idle_data
*idle
;
898 unsigned long long idle_count
;
899 unsigned int sequence
;
901 idle
= &per_cpu(s390_idle
, dev
->id
);
903 sequence
= idle
->sequence
;
907 idle_count
= idle
->idle_count
;
908 if (idle
->idle_enter
)
911 if (idle
->sequence
!= sequence
)
913 return sprintf(buf
, "%llu\n", idle_count
);
915 static SYSDEV_ATTR(idle_count
, 0444, show_idle_count
, NULL
);
917 static ssize_t
show_idle_time(struct sys_device
*dev
,
918 struct sysdev_attribute
*attr
, char *buf
)
920 struct s390_idle_data
*idle
;
921 unsigned long long now
, idle_time
, idle_enter
;
922 unsigned int sequence
;
924 idle
= &per_cpu(s390_idle
, dev
->id
);
927 sequence
= idle
->sequence
;
931 idle_time
= idle
->idle_time
;
932 idle_enter
= idle
->idle_enter
;
933 if (idle_enter
!= 0ULL && idle_enter
< now
)
934 idle_time
+= now
- idle_enter
;
936 if (idle
->sequence
!= sequence
)
938 return sprintf(buf
, "%llu\n", idle_time
>> 12);
940 static SYSDEV_ATTR(idle_time_us
, 0444, show_idle_time
, NULL
);
942 static struct attribute
*cpu_online_attrs
[] = {
943 &attr_capability
.attr
,
944 &attr_idle_count
.attr
,
945 &attr_idle_time_us
.attr
,
949 static struct attribute_group cpu_online_attr_group
= {
950 .attrs
= cpu_online_attrs
,
953 static int __cpuinit
smp_cpu_notify(struct notifier_block
*self
,
954 unsigned long action
, void *hcpu
)
956 unsigned int cpu
= (unsigned int)(long)hcpu
;
957 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
958 struct sys_device
*s
= &c
->sysdev
;
959 struct s390_idle_data
*idle
;
964 case CPU_ONLINE_FROZEN
:
965 idle
= &per_cpu(s390_idle
, cpu
);
966 memset(idle
, 0, sizeof(struct s390_idle_data
));
967 err
= sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
);
970 case CPU_DEAD_FROZEN
:
971 sysfs_remove_group(&s
->kobj
, &cpu_online_attr_group
);
974 return notifier_from_errno(err
);
977 static struct notifier_block __cpuinitdata smp_cpu_nb
= {
978 .notifier_call
= smp_cpu_notify
,
981 static int __devinit
smp_add_present_cpu(int cpu
)
983 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
984 struct sys_device
*s
= &c
->sysdev
;
988 rc
= register_cpu(c
, cpu
);
991 rc
= sysfs_create_group(&s
->kobj
, &cpu_common_attr_group
);
994 if (!cpu_online(cpu
))
996 rc
= sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
);
999 sysfs_remove_group(&s
->kobj
, &cpu_common_attr_group
);
1001 #ifdef CONFIG_HOTPLUG_CPU
1008 #ifdef CONFIG_HOTPLUG_CPU
1010 int __ref
smp_rescan_cpus(void)
1017 mutex_lock(&smp_cpu_state_mutex
);
1018 cpumask_copy(&newcpus
, cpu_present_mask
);
1019 rc
= __smp_rescan_cpus();
1022 cpumask_andnot(&newcpus
, cpu_present_mask
, &newcpus
);
1023 for_each_cpu(cpu
, &newcpus
) {
1024 rc
= smp_add_present_cpu(cpu
);
1026 set_cpu_present(cpu
, false);
1030 mutex_unlock(&smp_cpu_state_mutex
);
1032 if (!cpumask_empty(&newcpus
))
1033 topology_schedule_update();
1037 static ssize_t __ref
rescan_store(struct sysdev_class
*class,
1038 struct sysdev_class_attribute
*attr
,
1044 rc
= smp_rescan_cpus();
1045 return rc
? rc
: count
;
1047 static SYSDEV_CLASS_ATTR(rescan
, 0200, NULL
, rescan_store
);
1048 #endif /* CONFIG_HOTPLUG_CPU */
1050 static ssize_t
dispatching_show(struct sysdev_class
*class,
1051 struct sysdev_class_attribute
*attr
,
1056 mutex_lock(&smp_cpu_state_mutex
);
1057 count
= sprintf(buf
, "%d\n", cpu_management
);
1058 mutex_unlock(&smp_cpu_state_mutex
);
1062 static ssize_t
dispatching_store(struct sysdev_class
*dev
,
1063 struct sysdev_class_attribute
*attr
,
1070 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
1072 if (val
!= 0 && val
!= 1)
1076 mutex_lock(&smp_cpu_state_mutex
);
1077 if (cpu_management
== val
)
1079 rc
= topology_set_cpu_management(val
);
1081 cpu_management
= val
;
1083 mutex_unlock(&smp_cpu_state_mutex
);
1085 return rc
? rc
: count
;
1087 static SYSDEV_CLASS_ATTR(dispatching
, 0644, dispatching_show
,
1090 static int __init
topology_init(void)
1095 register_cpu_notifier(&smp_cpu_nb
);
1097 #ifdef CONFIG_HOTPLUG_CPU
1098 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_rescan
);
1102 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_dispatching
);
1105 for_each_present_cpu(cpu
) {
1106 rc
= smp_add_present_cpu(cpu
);
1112 subsys_initcall(topology_init
);