2 * arch/s390/kernel/smp.c
4 * Copyright IBM Corp. 1999,2007
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/module.h>
27 #include <linux/init.h>
29 #include <linux/err.h>
30 #include <linux/spinlock.h>
31 #include <linux/kernel_stat.h>
32 #include <linux/delay.h>
33 #include <linux/cache.h>
34 #include <linux/interrupt.h>
35 #include <linux/cpu.h>
36 #include <linux/timex.h>
37 #include <linux/bootmem.h>
39 #include <asm/setup.h>
41 #include <asm/pgalloc.h>
43 #include <asm/s390_ext.h>
44 #include <asm/cpcmd.h>
45 #include <asm/tlbflush.h>
46 #include <asm/timer.h>
47 #include <asm/lowcore.h>
54 * An array with a pointer the lowcore of every CPU.
56 struct _lowcore
*lowcore_ptr
[NR_CPUS
];
57 EXPORT_SYMBOL(lowcore_ptr
);
59 static struct task_struct
*current_set
[NR_CPUS
];
61 static u8 smp_cpu_type
;
62 static int smp_use_sigp_detection
;
69 DEFINE_MUTEX(smp_cpu_state_mutex
);
70 int smp_cpu_polarization
[NR_CPUS
];
71 static int smp_cpu_state
[NR_CPUS
];
72 static int cpu_management
;
74 static DEFINE_PER_CPU(struct cpu
, cpu_devices
);
76 static void smp_ext_bitcall(int, ec_bit_sig
);
78 void smp_send_stop(void)
82 /* Disable all interrupts/machine checks */
83 __load_psw_mask(psw_kernel_bits
& ~PSW_MASK_MCHECK
);
85 /* write magic number to zero page (absolute 0) */
86 lowcore_ptr
[smp_processor_id()]->panic_magic
= __PANIC_MAGIC
;
88 /* stop all processors */
89 for_each_online_cpu(cpu
) {
90 if (cpu
== smp_processor_id())
93 rc
= signal_processor(cpu
, sigp_stop
);
94 } while (rc
== sigp_busy
);
96 while (!smp_cpu_not_running(cpu
))
102 * This is the main routine where commands issued by other
106 static void do_ext_call_interrupt(__u16 code
)
111 * handle bit signal external calls
113 * For the ec_schedule signal we have to do nothing. All the work
114 * is done automatically when we return from the interrupt.
116 bits
= xchg(&S390_lowcore
.ext_call_fast
, 0);
118 if (test_bit(ec_call_function
, &bits
))
119 generic_smp_call_function_interrupt();
121 if (test_bit(ec_call_function_single
, &bits
))
122 generic_smp_call_function_single_interrupt();
126 * Send an external call sigp to another cpu and return without waiting
127 * for its completion.
129 static void smp_ext_bitcall(int cpu
, ec_bit_sig sig
)
132 * Set signaling bit in lowcore of target cpu and kick it
134 set_bit(sig
, (unsigned long *) &lowcore_ptr
[cpu
]->ext_call_fast
);
135 while (signal_processor(cpu
, sigp_emergency_signal
) == sigp_busy
)
139 void arch_send_call_function_ipi(cpumask_t mask
)
143 for_each_cpu_mask(cpu
, mask
)
144 smp_ext_bitcall(cpu
, ec_call_function
);
147 void arch_send_call_function_single_ipi(int cpu
)
149 smp_ext_bitcall(cpu
, ec_call_function_single
);
154 * this function sends a 'purge tlb' signal to another CPU.
156 static void smp_ptlb_callback(void *info
)
161 void smp_ptlb_all(void)
163 on_each_cpu(smp_ptlb_callback
, NULL
, 1);
165 EXPORT_SYMBOL(smp_ptlb_all
);
166 #endif /* ! CONFIG_64BIT */
169 * this function sends a 'reschedule' IPI to another CPU.
170 * it goes straight through and wastes no time serializing
171 * anything. Worst case is that we lose a reschedule ...
173 void smp_send_reschedule(int cpu
)
175 smp_ext_bitcall(cpu
, ec_schedule
);
179 * parameter area for the set/clear control bit callbacks
181 struct ec_creg_mask_parms
{
182 unsigned long orvals
[16];
183 unsigned long andvals
[16];
187 * callback for setting/clearing control bits
189 static void smp_ctl_bit_callback(void *info
)
191 struct ec_creg_mask_parms
*pp
= info
;
192 unsigned long cregs
[16];
195 __ctl_store(cregs
, 0, 15);
196 for (i
= 0; i
<= 15; i
++)
197 cregs
[i
] = (cregs
[i
] & pp
->andvals
[i
]) | pp
->orvals
[i
];
198 __ctl_load(cregs
, 0, 15);
202 * Set a bit in a control register of all cpus
204 void smp_ctl_set_bit(int cr
, int bit
)
206 struct ec_creg_mask_parms parms
;
208 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
209 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
210 parms
.orvals
[cr
] = 1 << bit
;
211 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
213 EXPORT_SYMBOL(smp_ctl_set_bit
);
216 * Clear a bit in a control register of all cpus
218 void smp_ctl_clear_bit(int cr
, int bit
)
220 struct ec_creg_mask_parms parms
;
222 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
223 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
224 parms
.andvals
[cr
] = ~(1L << bit
);
225 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
227 EXPORT_SYMBOL(smp_ctl_clear_bit
);
230 * In early ipl state a temp. logically cpu number is needed, so the sigp
231 * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on
232 * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1.
234 #define CPU_INIT_NO 1
236 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
239 * zfcpdump_prefix_array holds prefix registers for the following scenario:
240 * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to
241 * save its prefix registers, since they get lost, when switching from 31 bit
244 unsigned int zfcpdump_prefix_array
[NR_CPUS
+ 1] \
245 __attribute__((__section__(".data")));
247 static void __init
smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
)
249 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
251 if (cpu
>= NR_CPUS
) {
252 pr_warning("CPU %i exceeds the maximum %i and is excluded from "
253 "the dump\n", cpu
, NR_CPUS
- 1);
256 zfcpdump_save_areas
[cpu
] = kmalloc(sizeof(union save_area
), GFP_KERNEL
);
257 __cpu_logical_map
[CPU_INIT_NO
] = (__u16
) phy_cpu
;
258 while (signal_processor(CPU_INIT_NO
, sigp_stop_and_store_status
) ==
261 memcpy(zfcpdump_save_areas
[cpu
],
262 (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE
,
265 /* copy original prefix register */
266 zfcpdump_save_areas
[cpu
]->s390x
.pref_reg
= zfcpdump_prefix_array
[cpu
];
270 union save_area
*zfcpdump_save_areas
[NR_CPUS
+ 1];
271 EXPORT_SYMBOL_GPL(zfcpdump_save_areas
);
275 static inline void smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
) { }
277 #endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */
279 static int cpu_stopped(int cpu
)
283 /* Check for stopped state */
284 if (signal_processor_ps(&status
, 0, cpu
, sigp_sense
) ==
285 sigp_status_stored
) {
292 static int cpu_known(int cpu_id
)
296 for_each_present_cpu(cpu
) {
297 if (__cpu_logical_map
[cpu
] == cpu_id
)
303 static int smp_rescan_cpus_sigp(cpumask_t avail
)
305 int cpu_id
, logical_cpu
;
307 logical_cpu
= first_cpu(avail
);
308 if (logical_cpu
== NR_CPUS
)
310 for (cpu_id
= 0; cpu_id
<= 65535; cpu_id
++) {
311 if (cpu_known(cpu_id
))
313 __cpu_logical_map
[logical_cpu
] = cpu_id
;
314 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
315 if (!cpu_stopped(logical_cpu
))
317 cpu_set(logical_cpu
, cpu_present_map
);
318 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
319 logical_cpu
= next_cpu(logical_cpu
, avail
);
320 if (logical_cpu
== NR_CPUS
)
326 static int smp_rescan_cpus_sclp(cpumask_t avail
)
328 struct sclp_cpu_info
*info
;
329 int cpu_id
, logical_cpu
, cpu
;
332 logical_cpu
= first_cpu(avail
);
333 if (logical_cpu
== NR_CPUS
)
335 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
338 rc
= sclp_get_cpu_info(info
);
341 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
342 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
344 cpu_id
= info
->cpu
[cpu
].address
;
345 if (cpu_known(cpu_id
))
347 __cpu_logical_map
[logical_cpu
] = cpu_id
;
348 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
349 cpu_set(logical_cpu
, cpu_present_map
);
350 if (cpu
>= info
->configured
)
351 smp_cpu_state
[logical_cpu
] = CPU_STATE_STANDBY
;
353 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
354 logical_cpu
= next_cpu(logical_cpu
, avail
);
355 if (logical_cpu
== NR_CPUS
)
363 static int __smp_rescan_cpus(void)
367 cpus_xor(avail
, cpu_possible_map
, cpu_present_map
);
368 if (smp_use_sigp_detection
)
369 return smp_rescan_cpus_sigp(avail
);
371 return smp_rescan_cpus_sclp(avail
);
374 static void __init
smp_detect_cpus(void)
376 unsigned int cpu
, c_cpus
, s_cpus
;
377 struct sclp_cpu_info
*info
;
378 u16 boot_cpu_addr
, cpu_addr
;
382 boot_cpu_addr
= S390_lowcore
.cpu_data
.cpu_addr
;
383 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
385 panic("smp_detect_cpus failed to allocate memory\n");
386 /* Use sigp detection algorithm if sclp doesn't work. */
387 if (sclp_get_cpu_info(info
)) {
388 smp_use_sigp_detection
= 1;
389 for (cpu
= 0; cpu
<= 65535; cpu
++) {
390 if (cpu
== boot_cpu_addr
)
392 __cpu_logical_map
[CPU_INIT_NO
] = cpu
;
393 if (!cpu_stopped(CPU_INIT_NO
))
395 smp_get_save_area(c_cpus
, cpu
);
401 if (info
->has_cpu_type
) {
402 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
403 if (info
->cpu
[cpu
].address
== boot_cpu_addr
) {
404 smp_cpu_type
= info
->cpu
[cpu
].type
;
410 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
411 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
413 cpu_addr
= info
->cpu
[cpu
].address
;
414 if (cpu_addr
== boot_cpu_addr
)
416 __cpu_logical_map
[CPU_INIT_NO
] = cpu_addr
;
417 if (!cpu_stopped(CPU_INIT_NO
)) {
421 smp_get_save_area(c_cpus
, cpu_addr
);
426 pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus
, s_cpus
);
433 * Activate a secondary processor.
435 int __cpuinit
start_secondary(void *cpuvoid
)
440 /* Enable TOD clock interrupts on the secondary cpu. */
442 /* Enable cpu timer interrupts on the secondary cpu. */
444 /* Enable pfault pseudo page faults on this cpu. */
447 /* call cpu notifiers */
448 notify_cpu_starting(smp_processor_id());
449 /* Mark this cpu as online */
451 cpu_set(smp_processor_id(), cpu_online_map
);
453 /* Switch on interrupts */
455 /* Print info about this processor */
456 print_cpu_info(&S390_lowcore
.cpu_data
);
457 /* cpu_idle will call schedule for us */
462 static void __init
smp_create_idle(unsigned int cpu
)
464 struct task_struct
*p
;
467 * don't care about the psw and regs settings since we'll never
468 * reschedule the forked task.
472 panic("failed fork for CPU %u: %li", cpu
, PTR_ERR(p
));
473 current_set
[cpu
] = p
;
476 static int __cpuinit
smp_alloc_lowcore(int cpu
)
478 unsigned long async_stack
, panic_stack
;
479 struct _lowcore
*lowcore
;
482 lc_order
= sizeof(long) == 8 ? 1 : 0;
483 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, lc_order
);
486 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
487 panic_stack
= __get_free_page(GFP_KERNEL
);
488 if (!panic_stack
|| !async_stack
)
490 memcpy(lowcore
, &S390_lowcore
, 512);
491 memset((char *)lowcore
+ 512, 0, sizeof(*lowcore
) - 512);
492 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
493 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
496 if (MACHINE_HAS_IEEE
) {
497 unsigned long save_area
;
499 save_area
= get_zeroed_page(GFP_KERNEL
);
502 lowcore
->extended_save_area_addr
= (u32
) save_area
;
505 if (vdso_alloc_per_cpu(cpu
, lowcore
))
508 lowcore_ptr
[cpu
] = lowcore
;
512 free_page(panic_stack
);
513 free_pages(async_stack
, ASYNC_ORDER
);
514 free_pages((unsigned long) lowcore
, lc_order
);
518 #ifdef CONFIG_HOTPLUG_CPU
519 static void smp_free_lowcore(int cpu
)
521 struct _lowcore
*lowcore
;
524 lc_order
= sizeof(long) == 8 ? 1 : 0;
525 lowcore
= lowcore_ptr
[cpu
];
527 if (MACHINE_HAS_IEEE
)
528 free_page((unsigned long) lowcore
->extended_save_area_addr
);
530 vdso_free_per_cpu(cpu
, lowcore
);
532 free_page(lowcore
->panic_stack
- PAGE_SIZE
);
533 free_pages(lowcore
->async_stack
- ASYNC_SIZE
, ASYNC_ORDER
);
534 free_pages((unsigned long) lowcore
, lc_order
);
535 lowcore_ptr
[cpu
] = NULL
;
537 #endif /* CONFIG_HOTPLUG_CPU */
539 /* Upping and downing of CPUs */
540 int __cpuinit
__cpu_up(unsigned int cpu
)
542 struct task_struct
*idle
;
543 struct _lowcore
*cpu_lowcore
;
544 struct stack_frame
*sf
;
547 if (smp_cpu_state
[cpu
] != CPU_STATE_CONFIGURED
)
549 if (smp_alloc_lowcore(cpu
))
552 ccode
= signal_processor_p((__u32
)(unsigned long)(lowcore_ptr
[cpu
]),
553 cpu
, sigp_set_prefix
);
557 idle
= current_set
[cpu
];
558 cpu_lowcore
= lowcore_ptr
[cpu
];
559 cpu_lowcore
->kernel_stack
= (unsigned long)
560 task_stack_page(idle
) + THREAD_SIZE
;
561 cpu_lowcore
->thread_info
= (unsigned long) task_thread_info(idle
);
562 sf
= (struct stack_frame
*) (cpu_lowcore
->kernel_stack
563 - sizeof(struct pt_regs
)
564 - sizeof(struct stack_frame
));
565 memset(sf
, 0, sizeof(struct stack_frame
));
566 sf
->gprs
[9] = (unsigned long) sf
;
567 cpu_lowcore
->save_area
[15] = (unsigned long) sf
;
568 __ctl_store(cpu_lowcore
->cregs_save_area
, 0, 15);
571 : : "a" (&cpu_lowcore
->access_regs_save_area
) : "memory");
572 cpu_lowcore
->percpu_offset
= __per_cpu_offset
[cpu
];
573 cpu_lowcore
->current_task
= (unsigned long) idle
;
574 cpu_lowcore
->cpu_data
.cpu_nr
= cpu
;
575 cpu_lowcore
->kernel_asce
= S390_lowcore
.kernel_asce
;
576 cpu_lowcore
->ipl_device
= S390_lowcore
.ipl_device
;
579 while (signal_processor(cpu
, sigp_restart
) == sigp_busy
)
582 while (!cpu_online(cpu
))
587 static int __init
setup_possible_cpus(char *s
)
591 pcpus
= simple_strtoul(s
, NULL
, 0);
592 cpu_possible_map
= cpumask_of_cpu(0);
593 for (cpu
= 1; cpu
< pcpus
&& cpu
< NR_CPUS
; cpu
++)
594 cpu_set(cpu
, cpu_possible_map
);
597 early_param("possible_cpus", setup_possible_cpus
);
599 #ifdef CONFIG_HOTPLUG_CPU
601 int __cpu_disable(void)
603 struct ec_creg_mask_parms cr_parms
;
604 int cpu
= smp_processor_id();
606 cpu_clear(cpu
, cpu_online_map
);
608 /* Disable pfault pseudo page faults on this cpu. */
611 memset(&cr_parms
.orvals
, 0, sizeof(cr_parms
.orvals
));
612 memset(&cr_parms
.andvals
, 0xff, sizeof(cr_parms
.andvals
));
614 /* disable all external interrupts */
615 cr_parms
.orvals
[0] = 0;
616 cr_parms
.andvals
[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
617 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4);
618 /* disable all I/O interrupts */
619 cr_parms
.orvals
[6] = 0;
620 cr_parms
.andvals
[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
621 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
622 /* disable most machine checks */
623 cr_parms
.orvals
[14] = 0;
624 cr_parms
.andvals
[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
627 smp_ctl_bit_callback(&cr_parms
);
632 void __cpu_die(unsigned int cpu
)
634 /* Wait until target cpu is down */
635 while (!smp_cpu_not_running(cpu
))
637 smp_free_lowcore(cpu
);
638 pr_info("Processor %d stopped\n", cpu
);
644 signal_processor(smp_processor_id(), sigp_stop
);
649 #endif /* CONFIG_HOTPLUG_CPU */
651 void __init
smp_prepare_cpus(unsigned int max_cpus
)
654 unsigned long save_area
= 0;
656 unsigned long async_stack
, panic_stack
;
657 struct _lowcore
*lowcore
;
663 /* request the 0x1201 emergency signal external interrupt */
664 if (register_external_interrupt(0x1201, do_ext_call_interrupt
) != 0)
665 panic("Couldn't request external interrupt 0x1201");
666 print_cpu_info(&S390_lowcore
.cpu_data
);
668 /* Reallocate current lowcore, but keep its contents. */
669 lc_order
= sizeof(long) == 8 ? 1 : 0;
670 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, lc_order
);
671 panic_stack
= __get_free_page(GFP_KERNEL
);
672 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
673 BUG_ON(!lowcore
|| !panic_stack
|| !async_stack
);
675 if (MACHINE_HAS_IEEE
)
676 save_area
= get_zeroed_page(GFP_KERNEL
);
679 local_mcck_disable();
680 lowcore_ptr
[smp_processor_id()] = lowcore
;
681 *lowcore
= S390_lowcore
;
682 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
683 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
685 if (MACHINE_HAS_IEEE
)
686 lowcore
->extended_save_area_addr
= (u32
) save_area
;
688 if (vdso_alloc_per_cpu(smp_processor_id(), lowcore
))
691 set_prefix((u32
)(unsigned long) lowcore
);
694 for_each_possible_cpu(cpu
)
695 if (cpu
!= smp_processor_id())
696 smp_create_idle(cpu
);
699 void __init
smp_prepare_boot_cpu(void)
701 BUG_ON(smp_processor_id() != 0);
703 current_thread_info()->cpu
= 0;
704 cpu_set(0, cpu_present_map
);
705 cpu_set(0, cpu_online_map
);
706 S390_lowcore
.percpu_offset
= __per_cpu_offset
[0];
707 current_set
[0] = current
;
708 smp_cpu_state
[0] = CPU_STATE_CONFIGURED
;
709 smp_cpu_polarization
[0] = POLARIZATION_UNKNWN
;
712 void __init
smp_cpus_done(unsigned int max_cpus
)
717 * the frequency of the profiling timer can be changed
718 * by writing a multiplier value into /proc/profile.
720 * usually you want to run this on all CPUs ;)
722 int setup_profiling_timer(unsigned int multiplier
)
727 #ifdef CONFIG_HOTPLUG_CPU
728 static ssize_t
cpu_configure_show(struct sys_device
*dev
,
729 struct sysdev_attribute
*attr
, char *buf
)
733 mutex_lock(&smp_cpu_state_mutex
);
734 count
= sprintf(buf
, "%d\n", smp_cpu_state
[dev
->id
]);
735 mutex_unlock(&smp_cpu_state_mutex
);
739 static ssize_t
cpu_configure_store(struct sys_device
*dev
,
740 struct sysdev_attribute
*attr
,
741 const char *buf
, size_t count
)
747 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
749 if (val
!= 0 && val
!= 1)
753 mutex_lock(&smp_cpu_state_mutex
);
760 if (smp_cpu_state
[cpu
] == CPU_STATE_CONFIGURED
) {
761 rc
= sclp_cpu_deconfigure(__cpu_logical_map
[cpu
]);
763 smp_cpu_state
[cpu
] = CPU_STATE_STANDBY
;
764 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
769 if (smp_cpu_state
[cpu
] == CPU_STATE_STANDBY
) {
770 rc
= sclp_cpu_configure(__cpu_logical_map
[cpu
]);
772 smp_cpu_state
[cpu
] = CPU_STATE_CONFIGURED
;
773 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
781 mutex_unlock(&smp_cpu_state_mutex
);
783 return rc
? rc
: count
;
785 static SYSDEV_ATTR(configure
, 0644, cpu_configure_show
, cpu_configure_store
);
786 #endif /* CONFIG_HOTPLUG_CPU */
788 static ssize_t
cpu_polarization_show(struct sys_device
*dev
,
789 struct sysdev_attribute
*attr
, char *buf
)
794 mutex_lock(&smp_cpu_state_mutex
);
795 switch (smp_cpu_polarization
[cpu
]) {
796 case POLARIZATION_HRZ
:
797 count
= sprintf(buf
, "horizontal\n");
799 case POLARIZATION_VL
:
800 count
= sprintf(buf
, "vertical:low\n");
802 case POLARIZATION_VM
:
803 count
= sprintf(buf
, "vertical:medium\n");
805 case POLARIZATION_VH
:
806 count
= sprintf(buf
, "vertical:high\n");
809 count
= sprintf(buf
, "unknown\n");
812 mutex_unlock(&smp_cpu_state_mutex
);
815 static SYSDEV_ATTR(polarization
, 0444, cpu_polarization_show
, NULL
);
817 static ssize_t
show_cpu_address(struct sys_device
*dev
,
818 struct sysdev_attribute
*attr
, char *buf
)
820 return sprintf(buf
, "%d\n", __cpu_logical_map
[dev
->id
]);
822 static SYSDEV_ATTR(address
, 0444, show_cpu_address
, NULL
);
825 static struct attribute
*cpu_common_attrs
[] = {
826 #ifdef CONFIG_HOTPLUG_CPU
827 &attr_configure
.attr
,
830 &attr_polarization
.attr
,
834 static struct attribute_group cpu_common_attr_group
= {
835 .attrs
= cpu_common_attrs
,
838 static ssize_t
show_capability(struct sys_device
*dev
,
839 struct sysdev_attribute
*attr
, char *buf
)
841 unsigned int capability
;
844 rc
= get_cpu_capability(&capability
);
847 return sprintf(buf
, "%u\n", capability
);
849 static SYSDEV_ATTR(capability
, 0444, show_capability
, NULL
);
851 static ssize_t
show_idle_count(struct sys_device
*dev
,
852 struct sysdev_attribute
*attr
, char *buf
)
854 struct s390_idle_data
*idle
;
855 unsigned long long idle_count
;
857 idle
= &per_cpu(s390_idle
, dev
->id
);
858 spin_lock(&idle
->lock
);
859 idle_count
= idle
->idle_count
;
860 if (idle
->idle_enter
)
862 spin_unlock(&idle
->lock
);
863 return sprintf(buf
, "%llu\n", idle_count
);
865 static SYSDEV_ATTR(idle_count
, 0444, show_idle_count
, NULL
);
867 static ssize_t
show_idle_time(struct sys_device
*dev
,
868 struct sysdev_attribute
*attr
, char *buf
)
870 struct s390_idle_data
*idle
;
871 unsigned long long now
, idle_time
, idle_enter
;
873 idle
= &per_cpu(s390_idle
, dev
->id
);
874 spin_lock(&idle
->lock
);
876 idle_time
= idle
->idle_time
;
877 idle_enter
= idle
->idle_enter
;
878 if (idle_enter
!= 0ULL && idle_enter
< now
)
879 idle_time
+= now
- idle_enter
;
880 spin_unlock(&idle
->lock
);
881 return sprintf(buf
, "%llu\n", idle_time
>> 12);
883 static SYSDEV_ATTR(idle_time_us
, 0444, show_idle_time
, NULL
);
885 static struct attribute
*cpu_online_attrs
[] = {
886 &attr_capability
.attr
,
887 &attr_idle_count
.attr
,
888 &attr_idle_time_us
.attr
,
892 static struct attribute_group cpu_online_attr_group
= {
893 .attrs
= cpu_online_attrs
,
896 static int __cpuinit
smp_cpu_notify(struct notifier_block
*self
,
897 unsigned long action
, void *hcpu
)
899 unsigned int cpu
= (unsigned int)(long)hcpu
;
900 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
901 struct sys_device
*s
= &c
->sysdev
;
902 struct s390_idle_data
*idle
;
906 case CPU_ONLINE_FROZEN
:
907 idle
= &per_cpu(s390_idle
, cpu
);
908 spin_lock_irq(&idle
->lock
);
909 idle
->idle_enter
= 0;
911 idle
->idle_count
= 0;
912 spin_unlock_irq(&idle
->lock
);
913 if (sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
))
917 case CPU_DEAD_FROZEN
:
918 sysfs_remove_group(&s
->kobj
, &cpu_online_attr_group
);
924 static struct notifier_block __cpuinitdata smp_cpu_nb
= {
925 .notifier_call
= smp_cpu_notify
,
928 static int __devinit
smp_add_present_cpu(int cpu
)
930 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
931 struct sys_device
*s
= &c
->sysdev
;
935 rc
= register_cpu(c
, cpu
);
938 rc
= sysfs_create_group(&s
->kobj
, &cpu_common_attr_group
);
941 if (!cpu_online(cpu
))
943 rc
= sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
);
946 sysfs_remove_group(&s
->kobj
, &cpu_common_attr_group
);
948 #ifdef CONFIG_HOTPLUG_CPU
955 #ifdef CONFIG_HOTPLUG_CPU
957 int __ref
smp_rescan_cpus(void)
964 mutex_lock(&smp_cpu_state_mutex
);
965 newcpus
= cpu_present_map
;
966 rc
= __smp_rescan_cpus();
969 cpus_andnot(newcpus
, cpu_present_map
, newcpus
);
970 for_each_cpu_mask(cpu
, newcpus
) {
971 rc
= smp_add_present_cpu(cpu
);
973 cpu_clear(cpu
, cpu_present_map
);
977 mutex_unlock(&smp_cpu_state_mutex
);
979 if (!cpus_empty(newcpus
))
980 topology_schedule_update();
984 static ssize_t __ref
rescan_store(struct sysdev_class
*class, const char *buf
,
989 rc
= smp_rescan_cpus();
990 return rc
? rc
: count
;
992 static SYSDEV_CLASS_ATTR(rescan
, 0200, NULL
, rescan_store
);
993 #endif /* CONFIG_HOTPLUG_CPU */
995 static ssize_t
dispatching_show(struct sysdev_class
*class, char *buf
)
999 mutex_lock(&smp_cpu_state_mutex
);
1000 count
= sprintf(buf
, "%d\n", cpu_management
);
1001 mutex_unlock(&smp_cpu_state_mutex
);
1005 static ssize_t
dispatching_store(struct sysdev_class
*dev
, const char *buf
,
1011 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
1013 if (val
!= 0 && val
!= 1)
1017 mutex_lock(&smp_cpu_state_mutex
);
1018 if (cpu_management
== val
)
1020 rc
= topology_set_cpu_management(val
);
1022 cpu_management
= val
;
1024 mutex_unlock(&smp_cpu_state_mutex
);
1026 return rc
? rc
: count
;
1028 static SYSDEV_CLASS_ATTR(dispatching
, 0644, dispatching_show
,
1031 static int __init
topology_init(void)
1036 register_cpu_notifier(&smp_cpu_nb
);
1038 #ifdef CONFIG_HOTPLUG_CPU
1039 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_rescan
);
1043 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_dispatching
);
1046 for_each_present_cpu(cpu
) {
1047 rc
= smp_add_present_cpu(cpu
);
1053 subsys_initcall(topology_init
);