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 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/err.h>
27 #include <linux/spinlock.h>
28 #include <linux/kernel_stat.h>
29 #include <linux/delay.h>
30 #include <linux/cache.h>
31 #include <linux/interrupt.h>
32 #include <linux/cpu.h>
33 #include <linux/timex.h>
34 #include <linux/bootmem.h>
36 #include <asm/setup.h>
38 #include <asm/pgalloc.h>
40 #include <asm/s390_ext.h>
41 #include <asm/cpcmd.h>
42 #include <asm/tlbflush.h>
43 #include <asm/timer.h>
44 #include <asm/lowcore.h>
49 * An array with a pointer the lowcore of every CPU.
51 struct _lowcore
*lowcore_ptr
[NR_CPUS
];
52 EXPORT_SYMBOL(lowcore_ptr
);
54 cpumask_t cpu_online_map
= CPU_MASK_NONE
;
55 EXPORT_SYMBOL(cpu_online_map
);
57 cpumask_t cpu_possible_map
= CPU_MASK_ALL
;
58 EXPORT_SYMBOL(cpu_possible_map
);
60 static struct task_struct
*current_set
[NR_CPUS
];
62 static u8 smp_cpu_type
;
63 static int smp_use_sigp_detection
;
70 #ifdef CONFIG_HOTPLUG_CPU
71 static DEFINE_MUTEX(smp_cpu_state_mutex
);
73 static int smp_cpu_state
[NR_CPUS
];
75 static DEFINE_PER_CPU(struct cpu
, cpu_devices
);
76 DEFINE_PER_CPU(struct s390_idle_data
, s390_idle
);
78 static void smp_ext_bitcall(int, ec_bit_sig
);
81 * Structure and data for __smp_call_function_map(). This is designed to
82 * minimise static memory requirements. It also looks cleaner.
84 static DEFINE_SPINLOCK(call_lock
);
86 struct call_data_struct
{
87 void (*func
) (void *info
);
94 static struct call_data_struct
*call_data
;
97 * 'Call function' interrupt callback
99 static void do_call_function(void)
101 void (*func
) (void *info
) = call_data
->func
;
102 void *info
= call_data
->info
;
103 int wait
= call_data
->wait
;
105 cpu_set(smp_processor_id(), call_data
->started
);
108 cpu_set(smp_processor_id(), call_data
->finished
);;
111 static void __smp_call_function_map(void (*func
) (void *info
), void *info
,
112 int nonatomic
, int wait
, cpumask_t map
)
114 struct call_data_struct data
;
118 * Can deadlock when interrupts are disabled or if in wrong context.
120 WARN_ON(irqs_disabled() || in_irq());
123 * Check for local function call. We have to have the same call order
124 * as in on_each_cpu() because of machine_restart_smp().
126 if (cpu_isset(smp_processor_id(), map
)) {
128 cpu_clear(smp_processor_id(), map
);
131 cpus_and(map
, map
, cpu_online_map
);
137 data
.started
= CPU_MASK_NONE
;
140 data
.finished
= CPU_MASK_NONE
;
142 spin_lock(&call_lock
);
145 for_each_cpu_mask(cpu
, map
)
146 smp_ext_bitcall(cpu
, ec_call_function
);
148 /* Wait for response */
149 while (!cpus_equal(map
, data
.started
))
152 while (!cpus_equal(map
, data
.finished
))
154 spin_unlock(&call_lock
);
165 * @func: the function to run; this must be fast and non-blocking
166 * @info: an arbitrary pointer to pass to the function
168 * @wait: if true, wait (atomically) until function has completed on other CPUs
170 * Run a function on all other CPUs.
172 * You must not call this function with disabled interrupts, from a
173 * hardware interrupt handler or from a bottom half.
175 int smp_call_function(void (*func
) (void *info
), void *info
, int nonatomic
,
181 map
= cpu_online_map
;
182 cpu_clear(smp_processor_id(), map
);
183 __smp_call_function_map(func
, info
, nonatomic
, wait
, map
);
187 EXPORT_SYMBOL(smp_call_function
);
190 * smp_call_function_single:
191 * @cpu: the CPU where func should run
192 * @func: the function to run; this must be fast and non-blocking
193 * @info: an arbitrary pointer to pass to the function
195 * @wait: if true, wait (atomically) until function has completed on other CPUs
197 * Run a function on one processor.
199 * You must not call this function with disabled interrupts, from a
200 * hardware interrupt handler or from a bottom half.
202 int smp_call_function_single(int cpu
, void (*func
) (void *info
), void *info
,
203 int nonatomic
, int wait
)
206 __smp_call_function_map(func
, info
, nonatomic
, wait
,
207 cpumask_of_cpu(cpu
));
211 EXPORT_SYMBOL(smp_call_function_single
);
213 void smp_send_stop(void)
217 /* Disable all interrupts/machine checks */
218 __load_psw_mask(psw_kernel_bits
& ~PSW_MASK_MCHECK
);
220 /* write magic number to zero page (absolute 0) */
221 lowcore_ptr
[smp_processor_id()]->panic_magic
= __PANIC_MAGIC
;
223 /* stop all processors */
224 for_each_online_cpu(cpu
) {
225 if (cpu
== smp_processor_id())
228 rc
= signal_processor(cpu
, sigp_stop
);
229 } while (rc
== sigp_busy
);
231 while (!smp_cpu_not_running(cpu
))
237 * This is the main routine where commands issued by other
241 static void do_ext_call_interrupt(__u16 code
)
246 * handle bit signal external calls
248 * For the ec_schedule signal we have to do nothing. All the work
249 * is done automatically when we return from the interrupt.
251 bits
= xchg(&S390_lowcore
.ext_call_fast
, 0);
253 if (test_bit(ec_call_function
, &bits
))
258 * Send an external call sigp to another cpu and return without waiting
259 * for its completion.
261 static void smp_ext_bitcall(int cpu
, ec_bit_sig sig
)
264 * Set signaling bit in lowcore of target cpu and kick it
266 set_bit(sig
, (unsigned long *) &lowcore_ptr
[cpu
]->ext_call_fast
);
267 while (signal_processor(cpu
, sigp_emergency_signal
) == sigp_busy
)
273 * this function sends a 'purge tlb' signal to another CPU.
275 void smp_ptlb_callback(void *info
)
280 void smp_ptlb_all(void)
282 on_each_cpu(smp_ptlb_callback
, NULL
, 0, 1);
284 EXPORT_SYMBOL(smp_ptlb_all
);
285 #endif /* ! CONFIG_64BIT */
288 * this function sends a 'reschedule' IPI to another CPU.
289 * it goes straight through and wastes no time serializing
290 * anything. Worst case is that we lose a reschedule ...
292 void smp_send_reschedule(int cpu
)
294 smp_ext_bitcall(cpu
, ec_schedule
);
298 * parameter area for the set/clear control bit callbacks
300 struct ec_creg_mask_parms
{
301 unsigned long orvals
[16];
302 unsigned long andvals
[16];
306 * callback for setting/clearing control bits
308 static void smp_ctl_bit_callback(void *info
)
310 struct ec_creg_mask_parms
*pp
= info
;
311 unsigned long cregs
[16];
314 __ctl_store(cregs
, 0, 15);
315 for (i
= 0; i
<= 15; i
++)
316 cregs
[i
] = (cregs
[i
] & pp
->andvals
[i
]) | pp
->orvals
[i
];
317 __ctl_load(cregs
, 0, 15);
321 * Set a bit in a control register of all cpus
323 void smp_ctl_set_bit(int cr
, int bit
)
325 struct ec_creg_mask_parms parms
;
327 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
328 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
329 parms
.orvals
[cr
] = 1 << bit
;
330 on_each_cpu(smp_ctl_bit_callback
, &parms
, 0, 1);
332 EXPORT_SYMBOL(smp_ctl_set_bit
);
335 * Clear a bit in a control register of all cpus
337 void smp_ctl_clear_bit(int cr
, int bit
)
339 struct ec_creg_mask_parms parms
;
341 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
342 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
343 parms
.andvals
[cr
] = ~(1L << bit
);
344 on_each_cpu(smp_ctl_bit_callback
, &parms
, 0, 1);
346 EXPORT_SYMBOL(smp_ctl_clear_bit
);
349 * In early ipl state a temp. logically cpu number is needed, so the sigp
350 * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on
351 * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1.
353 #define CPU_INIT_NO 1
355 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
358 * zfcpdump_prefix_array holds prefix registers for the following scenario:
359 * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to
360 * save its prefix registers, since they get lost, when switching from 31 bit
363 unsigned int zfcpdump_prefix_array
[NR_CPUS
+ 1] \
364 __attribute__((__section__(".data")));
366 static void __init
smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
)
368 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
370 if (cpu
>= NR_CPUS
) {
371 printk(KERN_WARNING
"Registers for cpu %i not saved since dump "
372 "kernel was compiled with NR_CPUS=%i\n", cpu
, NR_CPUS
);
375 zfcpdump_save_areas
[cpu
] = kmalloc(sizeof(union save_area
), GFP_KERNEL
);
376 __cpu_logical_map
[CPU_INIT_NO
] = (__u16
) phy_cpu
;
377 while (signal_processor(CPU_INIT_NO
, sigp_stop_and_store_status
) ==
380 memcpy(zfcpdump_save_areas
[cpu
],
381 (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE
,
384 /* copy original prefix register */
385 zfcpdump_save_areas
[cpu
]->s390x
.pref_reg
= zfcpdump_prefix_array
[cpu
];
389 union save_area
*zfcpdump_save_areas
[NR_CPUS
+ 1];
390 EXPORT_SYMBOL_GPL(zfcpdump_save_areas
);
394 static inline void smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
) { }
396 #endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */
398 static int cpu_stopped(int cpu
)
402 /* Check for stopped state */
403 if (signal_processor_ps(&status
, 0, cpu
, sigp_sense
) ==
404 sigp_status_stored
) {
411 static int cpu_known(int cpu_id
)
415 for_each_present_cpu(cpu
) {
416 if (__cpu_logical_map
[cpu
] == cpu_id
)
422 static int smp_rescan_cpus_sigp(cpumask_t avail
)
424 int cpu_id
, logical_cpu
;
426 logical_cpu
= first_cpu(avail
);
427 if (logical_cpu
== NR_CPUS
)
429 for (cpu_id
= 0; cpu_id
<= 65535; cpu_id
++) {
430 if (cpu_known(cpu_id
))
432 __cpu_logical_map
[logical_cpu
] = cpu_id
;
433 if (!cpu_stopped(logical_cpu
))
435 cpu_set(logical_cpu
, cpu_present_map
);
436 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
437 logical_cpu
= next_cpu(logical_cpu
, avail
);
438 if (logical_cpu
== NR_CPUS
)
444 static int smp_rescan_cpus_sclp(cpumask_t avail
)
446 struct sclp_cpu_info
*info
;
447 int cpu_id
, logical_cpu
, cpu
;
450 logical_cpu
= first_cpu(avail
);
451 if (logical_cpu
== NR_CPUS
)
453 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
456 rc
= sclp_get_cpu_info(info
);
459 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
460 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
462 cpu_id
= info
->cpu
[cpu
].address
;
463 if (cpu_known(cpu_id
))
465 __cpu_logical_map
[logical_cpu
] = cpu_id
;
466 cpu_set(logical_cpu
, cpu_present_map
);
467 if (cpu
>= info
->configured
)
468 smp_cpu_state
[logical_cpu
] = CPU_STATE_STANDBY
;
470 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
471 logical_cpu
= next_cpu(logical_cpu
, avail
);
472 if (logical_cpu
== NR_CPUS
)
480 static int smp_rescan_cpus(void)
484 cpus_xor(avail
, cpu_possible_map
, cpu_present_map
);
485 if (smp_use_sigp_detection
)
486 return smp_rescan_cpus_sigp(avail
);
488 return smp_rescan_cpus_sclp(avail
);
491 static void __init
smp_detect_cpus(void)
493 unsigned int cpu
, c_cpus
, s_cpus
;
494 struct sclp_cpu_info
*info
;
495 u16 boot_cpu_addr
, cpu_addr
;
499 boot_cpu_addr
= S390_lowcore
.cpu_data
.cpu_addr
;
500 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
502 panic("smp_detect_cpus failed to allocate memory\n");
503 /* Use sigp detection algorithm if sclp doesn't work. */
504 if (sclp_get_cpu_info(info
)) {
505 smp_use_sigp_detection
= 1;
506 for (cpu
= 0; cpu
<= 65535; cpu
++) {
507 if (cpu
== boot_cpu_addr
)
509 __cpu_logical_map
[CPU_INIT_NO
] = cpu
;
510 if (!cpu_stopped(CPU_INIT_NO
))
512 smp_get_save_area(c_cpus
, cpu
);
518 if (info
->has_cpu_type
) {
519 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
520 if (info
->cpu
[cpu
].address
== boot_cpu_addr
) {
521 smp_cpu_type
= info
->cpu
[cpu
].type
;
527 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
528 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
530 cpu_addr
= info
->cpu
[cpu
].address
;
531 if (cpu_addr
== boot_cpu_addr
)
533 __cpu_logical_map
[CPU_INIT_NO
] = cpu_addr
;
534 if (!cpu_stopped(CPU_INIT_NO
)) {
538 smp_get_save_area(c_cpus
, cpu_addr
);
543 printk(KERN_INFO
"CPUs: %d configured, %d standby\n", c_cpus
, s_cpus
);
546 unlock_cpu_hotplug();
550 * Activate a secondary processor.
552 int __cpuinit
start_secondary(void *cpuvoid
)
557 /* Enable TOD clock interrupts on the secondary cpu. */
559 #ifdef CONFIG_VIRT_TIMER
560 /* Enable cpu timer interrupts on the secondary cpu. */
563 /* Enable pfault pseudo page faults on this cpu. */
566 /* Mark this cpu as online */
567 cpu_set(smp_processor_id(), cpu_online_map
);
568 /* Switch on interrupts */
570 /* Print info about this processor */
571 print_cpu_info(&S390_lowcore
.cpu_data
);
572 /* cpu_idle will call schedule for us */
577 static void __init
smp_create_idle(unsigned int cpu
)
579 struct task_struct
*p
;
582 * don't care about the psw and regs settings since we'll never
583 * reschedule the forked task.
587 panic("failed fork for CPU %u: %li", cpu
, PTR_ERR(p
));
588 current_set
[cpu
] = p
;
589 spin_lock_init(&(&per_cpu(s390_idle
, cpu
))->lock
);
592 /* Upping and downing of CPUs */
593 int __cpu_up(unsigned int cpu
)
595 struct task_struct
*idle
;
596 struct _lowcore
*cpu_lowcore
;
597 struct stack_frame
*sf
;
600 if (smp_cpu_state
[cpu
] != CPU_STATE_CONFIGURED
)
603 ccode
= signal_processor_p((__u32
)(unsigned long)(lowcore_ptr
[cpu
]),
604 cpu
, sigp_set_prefix
);
606 printk("sigp_set_prefix failed for cpu %d "
607 "with condition code %d\n",
608 (int) cpu
, (int) ccode
);
612 idle
= current_set
[cpu
];
613 cpu_lowcore
= lowcore_ptr
[cpu
];
614 cpu_lowcore
->kernel_stack
= (unsigned long)
615 task_stack_page(idle
) + THREAD_SIZE
;
616 sf
= (struct stack_frame
*) (cpu_lowcore
->kernel_stack
617 - sizeof(struct pt_regs
)
618 - sizeof(struct stack_frame
));
619 memset(sf
, 0, sizeof(struct stack_frame
));
620 sf
->gprs
[9] = (unsigned long) sf
;
621 cpu_lowcore
->save_area
[15] = (unsigned long) sf
;
622 __ctl_store(cpu_lowcore
->cregs_save_area
[0], 0, 15);
625 : : "a" (&cpu_lowcore
->access_regs_save_area
) : "memory");
626 cpu_lowcore
->percpu_offset
= __per_cpu_offset
[cpu
];
627 cpu_lowcore
->current_task
= (unsigned long) idle
;
628 cpu_lowcore
->cpu_data
.cpu_nr
= cpu
;
631 while (signal_processor(cpu
, sigp_restart
) == sigp_busy
)
634 while (!cpu_online(cpu
))
639 static int __init
setup_possible_cpus(char *s
)
643 pcpus
= simple_strtoul(s
, NULL
, 0);
644 cpu_possible_map
= cpumask_of_cpu(0);
645 for (cpu
= 1; cpu
< pcpus
&& cpu
< NR_CPUS
; cpu
++)
646 cpu_set(cpu
, cpu_possible_map
);
649 early_param("possible_cpus", setup_possible_cpus
);
651 #ifdef CONFIG_HOTPLUG_CPU
653 int __cpu_disable(void)
655 struct ec_creg_mask_parms cr_parms
;
656 int cpu
= smp_processor_id();
658 cpu_clear(cpu
, cpu_online_map
);
660 /* Disable pfault pseudo page faults on this cpu. */
663 memset(&cr_parms
.orvals
, 0, sizeof(cr_parms
.orvals
));
664 memset(&cr_parms
.andvals
, 0xff, sizeof(cr_parms
.andvals
));
666 /* disable all external interrupts */
667 cr_parms
.orvals
[0] = 0;
668 cr_parms
.andvals
[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
669 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4);
670 /* disable all I/O interrupts */
671 cr_parms
.orvals
[6] = 0;
672 cr_parms
.andvals
[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
673 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
674 /* disable most machine checks */
675 cr_parms
.orvals
[14] = 0;
676 cr_parms
.andvals
[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
679 smp_ctl_bit_callback(&cr_parms
);
684 void __cpu_die(unsigned int cpu
)
686 /* Wait until target cpu is down */
687 while (!smp_cpu_not_running(cpu
))
689 printk(KERN_INFO
"Processor %d spun down\n", cpu
);
695 signal_processor(smp_processor_id(), sigp_stop
);
700 #endif /* CONFIG_HOTPLUG_CPU */
703 * Cycle through the processors and setup structures.
706 void __init
smp_prepare_cpus(unsigned int max_cpus
)
714 /* request the 0x1201 emergency signal external interrupt */
715 if (register_external_interrupt(0x1201, do_ext_call_interrupt
) != 0)
716 panic("Couldn't request external interrupt 0x1201");
717 memset(lowcore_ptr
, 0, sizeof(lowcore_ptr
));
719 * Initialize prefix pages and stacks for all possible cpus
721 print_cpu_info(&S390_lowcore
.cpu_data
);
723 for_each_possible_cpu(i
) {
724 lowcore_ptr
[i
] = (struct _lowcore
*)
725 __get_free_pages(GFP_KERNEL
| GFP_DMA
,
726 sizeof(void*) == 8 ? 1 : 0);
727 stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
728 if (!lowcore_ptr
[i
] || !stack
)
729 panic("smp_boot_cpus failed to allocate memory\n");
731 *(lowcore_ptr
[i
]) = S390_lowcore
;
732 lowcore_ptr
[i
]->async_stack
= stack
+ ASYNC_SIZE
;
733 stack
= __get_free_pages(GFP_KERNEL
, 0);
735 panic("smp_boot_cpus failed to allocate memory\n");
736 lowcore_ptr
[i
]->panic_stack
= stack
+ PAGE_SIZE
;
738 if (MACHINE_HAS_IEEE
) {
739 lowcore_ptr
[i
]->extended_save_area_addr
=
740 (__u32
) __get_free_pages(GFP_KERNEL
, 0);
741 if (!lowcore_ptr
[i
]->extended_save_area_addr
)
742 panic("smp_boot_cpus failed to "
743 "allocate memory\n");
748 if (MACHINE_HAS_IEEE
)
749 ctl_set_bit(14, 29); /* enable extended save area */
751 set_prefix((u32
)(unsigned long) lowcore_ptr
[smp_processor_id()]);
753 for_each_possible_cpu(cpu
)
754 if (cpu
!= smp_processor_id())
755 smp_create_idle(cpu
);
758 void __init
smp_prepare_boot_cpu(void)
760 BUG_ON(smp_processor_id() != 0);
762 current_thread_info()->cpu
= 0;
763 cpu_set(0, cpu_present_map
);
764 cpu_set(0, cpu_online_map
);
765 S390_lowcore
.percpu_offset
= __per_cpu_offset
[0];
766 current_set
[0] = current
;
767 smp_cpu_state
[0] = CPU_STATE_CONFIGURED
;
768 spin_lock_init(&(&__get_cpu_var(s390_idle
))->lock
);
771 void __init
smp_cpus_done(unsigned int max_cpus
)
776 * the frequency of the profiling timer can be changed
777 * by writing a multiplier value into /proc/profile.
779 * usually you want to run this on all CPUs ;)
781 int setup_profiling_timer(unsigned int multiplier
)
786 #ifdef CONFIG_HOTPLUG_CPU
787 static ssize_t
cpu_configure_show(struct sys_device
*dev
, char *buf
)
791 mutex_lock(&smp_cpu_state_mutex
);
792 count
= sprintf(buf
, "%d\n", smp_cpu_state
[dev
->id
]);
793 mutex_unlock(&smp_cpu_state_mutex
);
797 static ssize_t
cpu_configure_store(struct sys_device
*dev
, const char *buf
,
804 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
806 if (val
!= 0 && val
!= 1)
809 mutex_lock(&smp_cpu_state_mutex
);
817 if (smp_cpu_state
[cpu
] == CPU_STATE_CONFIGURED
) {
818 rc
= sclp_cpu_deconfigure(__cpu_logical_map
[cpu
]);
820 smp_cpu_state
[cpu
] = CPU_STATE_STANDBY
;
824 if (smp_cpu_state
[cpu
] == CPU_STATE_STANDBY
) {
825 rc
= sclp_cpu_configure(__cpu_logical_map
[cpu
]);
827 smp_cpu_state
[cpu
] = CPU_STATE_CONFIGURED
;
834 unlock_cpu_hotplug();
835 mutex_unlock(&smp_cpu_state_mutex
);
836 return rc
? rc
: count
;
838 static SYSDEV_ATTR(configure
, 0644, cpu_configure_show
, cpu_configure_store
);
839 #endif /* CONFIG_HOTPLUG_CPU */
841 static ssize_t
show_cpu_address(struct sys_device
*dev
, char *buf
)
843 return sprintf(buf
, "%d\n", __cpu_logical_map
[dev
->id
]);
845 static SYSDEV_ATTR(address
, 0444, show_cpu_address
, NULL
);
848 static struct attribute
*cpu_common_attrs
[] = {
849 #ifdef CONFIG_HOTPLUG_CPU
850 &attr_configure
.attr
,
856 static struct attribute_group cpu_common_attr_group
= {
857 .attrs
= cpu_common_attrs
,
860 static ssize_t
show_capability(struct sys_device
*dev
, char *buf
)
862 unsigned int capability
;
865 rc
= get_cpu_capability(&capability
);
868 return sprintf(buf
, "%u\n", capability
);
870 static SYSDEV_ATTR(capability
, 0444, show_capability
, NULL
);
872 static ssize_t
show_idle_count(struct sys_device
*dev
, char *buf
)
874 struct s390_idle_data
*idle
;
875 unsigned long long idle_count
;
877 idle
= &per_cpu(s390_idle
, dev
->id
);
878 spin_lock_irq(&idle
->lock
);
879 idle_count
= idle
->idle_count
;
880 spin_unlock_irq(&idle
->lock
);
881 return sprintf(buf
, "%llu\n", idle_count
);
883 static SYSDEV_ATTR(idle_count
, 0444, show_idle_count
, NULL
);
885 static ssize_t
show_idle_time(struct sys_device
*dev
, char *buf
)
887 struct s390_idle_data
*idle
;
888 unsigned long long new_time
;
890 idle
= &per_cpu(s390_idle
, dev
->id
);
891 spin_lock_irq(&idle
->lock
);
893 new_time
= get_clock();
894 idle
->idle_time
+= new_time
- idle
->idle_enter
;
895 idle
->idle_enter
= new_time
;
897 new_time
= idle
->idle_time
;
898 spin_unlock_irq(&idle
->lock
);
899 return sprintf(buf
, "%llu\n", new_time
>> 12);
901 static SYSDEV_ATTR(idle_time_us
, 0444, show_idle_time
, NULL
);
903 static struct attribute
*cpu_online_attrs
[] = {
904 &attr_capability
.attr
,
905 &attr_idle_count
.attr
,
906 &attr_idle_time_us
.attr
,
910 static struct attribute_group cpu_online_attr_group
= {
911 .attrs
= cpu_online_attrs
,
914 static int __cpuinit
smp_cpu_notify(struct notifier_block
*self
,
915 unsigned long action
, void *hcpu
)
917 unsigned int cpu
= (unsigned int)(long)hcpu
;
918 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
919 struct sys_device
*s
= &c
->sysdev
;
920 struct s390_idle_data
*idle
;
924 case CPU_ONLINE_FROZEN
:
925 idle
= &per_cpu(s390_idle
, cpu
);
926 spin_lock_irq(&idle
->lock
);
927 idle
->idle_enter
= 0;
929 idle
->idle_count
= 0;
930 spin_unlock_irq(&idle
->lock
);
931 if (sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
))
935 case CPU_DEAD_FROZEN
:
936 sysfs_remove_group(&s
->kobj
, &cpu_online_attr_group
);
942 static struct notifier_block __cpuinitdata smp_cpu_nb
= {
943 .notifier_call
= smp_cpu_notify
,
946 static int smp_add_present_cpu(int cpu
)
948 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
949 struct sys_device
*s
= &c
->sysdev
;
953 rc
= register_cpu(c
, cpu
);
956 rc
= sysfs_create_group(&s
->kobj
, &cpu_common_attr_group
);
959 if (!cpu_online(cpu
))
961 rc
= sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
);
964 sysfs_remove_group(&s
->kobj
, &cpu_common_attr_group
);
966 #ifdef CONFIG_HOTPLUG_CPU
973 #ifdef CONFIG_HOTPLUG_CPU
974 static ssize_t
rescan_store(struct sys_device
*dev
, const char *buf
,
981 mutex_lock(&smp_cpu_state_mutex
);
983 newcpus
= cpu_present_map
;
984 rc
= smp_rescan_cpus();
987 cpus_andnot(newcpus
, cpu_present_map
, newcpus
);
988 for_each_cpu_mask(cpu
, newcpus
) {
989 rc
= smp_add_present_cpu(cpu
);
991 cpu_clear(cpu
, cpu_present_map
);
995 unlock_cpu_hotplug();
996 mutex_unlock(&smp_cpu_state_mutex
);
997 return rc
? rc
: count
;
999 static SYSDEV_ATTR(rescan
, 0200, NULL
, rescan_store
);
1000 #endif /* CONFIG_HOTPLUG_CPU */
1002 static int __init
topology_init(void)
1007 register_cpu_notifier(&smp_cpu_nb
);
1009 #ifdef CONFIG_HOTPLUG_CPU
1010 rc
= sysfs_create_file(&cpu_sysdev_class
.kset
.kobj
,
1015 for_each_present_cpu(cpu
) {
1016 rc
= smp_add_present_cpu(cpu
);
1022 subsys_initcall(topology_init
);