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/irqflags.h>
36 #include <linux/cpu.h>
37 #include <linux/timex.h>
38 #include <linux/bootmem.h>
40 #include <asm/setup.h>
42 #include <asm/pgalloc.h>
44 #include <asm/s390_ext.h>
45 #include <asm/cpcmd.h>
46 #include <asm/tlbflush.h>
47 #include <asm/timer.h>
48 #include <asm/lowcore.h>
54 static struct task_struct
*current_set
[NR_CPUS
];
56 static u8 smp_cpu_type
;
57 static int smp_use_sigp_detection
;
64 DEFINE_MUTEX(smp_cpu_state_mutex
);
65 int smp_cpu_polarization
[NR_CPUS
];
66 static int smp_cpu_state
[NR_CPUS
];
67 static int cpu_management
;
69 static DEFINE_PER_CPU(struct cpu
, cpu_devices
);
71 static void smp_ext_bitcall(int, ec_bit_sig
);
73 void smp_send_stop(void)
77 /* Disable all interrupts/machine checks */
78 __load_psw_mask(psw_kernel_bits
& ~PSW_MASK_MCHECK
);
81 /* stop all processors */
82 for_each_online_cpu(cpu
) {
83 if (cpu
== smp_processor_id())
86 rc
= signal_processor(cpu
, sigp_stop
);
87 } while (rc
== sigp_busy
);
89 while (!smp_cpu_not_running(cpu
))
95 * This is the main routine where commands issued by other
99 static void do_ext_call_interrupt(__u16 code
)
104 * handle bit signal external calls
106 * For the ec_schedule signal we have to do nothing. All the work
107 * is done automatically when we return from the interrupt.
109 bits
= xchg(&S390_lowcore
.ext_call_fast
, 0);
111 if (test_bit(ec_call_function
, &bits
))
112 generic_smp_call_function_interrupt();
114 if (test_bit(ec_call_function_single
, &bits
))
115 generic_smp_call_function_single_interrupt();
119 * Send an external call sigp to another cpu and return without waiting
120 * for its completion.
122 static void smp_ext_bitcall(int cpu
, ec_bit_sig sig
)
125 * Set signaling bit in lowcore of target cpu and kick it
127 set_bit(sig
, (unsigned long *) &lowcore_ptr
[cpu
]->ext_call_fast
);
128 while (signal_processor(cpu
, sigp_emergency_signal
) == sigp_busy
)
132 void arch_send_call_function_ipi(cpumask_t mask
)
136 for_each_cpu_mask(cpu
, mask
)
137 smp_ext_bitcall(cpu
, ec_call_function
);
140 void arch_send_call_function_single_ipi(int cpu
)
142 smp_ext_bitcall(cpu
, ec_call_function_single
);
147 * this function sends a 'purge tlb' signal to another CPU.
149 static void smp_ptlb_callback(void *info
)
154 void smp_ptlb_all(void)
156 on_each_cpu(smp_ptlb_callback
, NULL
, 1);
158 EXPORT_SYMBOL(smp_ptlb_all
);
159 #endif /* ! CONFIG_64BIT */
162 * this function sends a 'reschedule' IPI to another CPU.
163 * it goes straight through and wastes no time serializing
164 * anything. Worst case is that we lose a reschedule ...
166 void smp_send_reschedule(int cpu
)
168 smp_ext_bitcall(cpu
, ec_schedule
);
172 * parameter area for the set/clear control bit callbacks
174 struct ec_creg_mask_parms
{
175 unsigned long orvals
[16];
176 unsigned long andvals
[16];
180 * callback for setting/clearing control bits
182 static void smp_ctl_bit_callback(void *info
)
184 struct ec_creg_mask_parms
*pp
= info
;
185 unsigned long cregs
[16];
188 __ctl_store(cregs
, 0, 15);
189 for (i
= 0; i
<= 15; i
++)
190 cregs
[i
] = (cregs
[i
] & pp
->andvals
[i
]) | pp
->orvals
[i
];
191 __ctl_load(cregs
, 0, 15);
195 * Set a bit in a control register of all cpus
197 void smp_ctl_set_bit(int cr
, int bit
)
199 struct ec_creg_mask_parms parms
;
201 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
202 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
203 parms
.orvals
[cr
] = 1 << bit
;
204 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
206 EXPORT_SYMBOL(smp_ctl_set_bit
);
209 * Clear a bit in a control register of all cpus
211 void smp_ctl_clear_bit(int cr
, int bit
)
213 struct ec_creg_mask_parms parms
;
215 memset(&parms
.orvals
, 0, sizeof(parms
.orvals
));
216 memset(&parms
.andvals
, 0xff, sizeof(parms
.andvals
));
217 parms
.andvals
[cr
] = ~(1L << bit
);
218 on_each_cpu(smp_ctl_bit_callback
, &parms
, 1);
220 EXPORT_SYMBOL(smp_ctl_clear_bit
);
223 * In early ipl state a temp. logically cpu number is needed, so the sigp
224 * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on
225 * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1.
227 #define CPU_INIT_NO 1
229 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
232 * zfcpdump_prefix_array holds prefix registers for the following scenario:
233 * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to
234 * save its prefix registers, since they get lost, when switching from 31 bit
237 unsigned int zfcpdump_prefix_array
[NR_CPUS
+ 1] \
238 __attribute__((__section__(".data")));
240 static void __init
smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
)
242 if (ipl_info
.type
!= IPL_TYPE_FCP_DUMP
)
244 if (cpu
>= NR_CPUS
) {
245 pr_warning("CPU %i exceeds the maximum %i and is excluded from "
246 "the dump\n", cpu
, NR_CPUS
- 1);
249 zfcpdump_save_areas
[cpu
] = kmalloc(sizeof(union save_area
), GFP_KERNEL
);
250 __cpu_logical_map
[CPU_INIT_NO
] = (__u16
) phy_cpu
;
251 while (signal_processor(CPU_INIT_NO
, sigp_stop_and_store_status
) ==
254 memcpy(zfcpdump_save_areas
[cpu
],
255 (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE
,
258 /* copy original prefix register */
259 zfcpdump_save_areas
[cpu
]->s390x
.pref_reg
= zfcpdump_prefix_array
[cpu
];
263 union save_area
*zfcpdump_save_areas
[NR_CPUS
+ 1];
264 EXPORT_SYMBOL_GPL(zfcpdump_save_areas
);
268 static inline void smp_get_save_area(unsigned int cpu
, unsigned int phy_cpu
) { }
270 #endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */
272 static int cpu_stopped(int cpu
)
276 /* Check for stopped state */
277 if (signal_processor_ps(&status
, 0, cpu
, sigp_sense
) ==
278 sigp_status_stored
) {
285 static int cpu_known(int cpu_id
)
289 for_each_present_cpu(cpu
) {
290 if (__cpu_logical_map
[cpu
] == cpu_id
)
296 static int smp_rescan_cpus_sigp(cpumask_t avail
)
298 int cpu_id
, logical_cpu
;
300 logical_cpu
= first_cpu(avail
);
301 if (logical_cpu
== NR_CPUS
)
303 for (cpu_id
= 0; cpu_id
<= 65535; cpu_id
++) {
304 if (cpu_known(cpu_id
))
306 __cpu_logical_map
[logical_cpu
] = cpu_id
;
307 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
308 if (!cpu_stopped(logical_cpu
))
310 cpu_set(logical_cpu
, cpu_present_map
);
311 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
312 logical_cpu
= next_cpu(logical_cpu
, avail
);
313 if (logical_cpu
== NR_CPUS
)
319 static int smp_rescan_cpus_sclp(cpumask_t avail
)
321 struct sclp_cpu_info
*info
;
322 int cpu_id
, logical_cpu
, cpu
;
325 logical_cpu
= first_cpu(avail
);
326 if (logical_cpu
== NR_CPUS
)
328 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
331 rc
= sclp_get_cpu_info(info
);
334 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
335 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
337 cpu_id
= info
->cpu
[cpu
].address
;
338 if (cpu_known(cpu_id
))
340 __cpu_logical_map
[logical_cpu
] = cpu_id
;
341 smp_cpu_polarization
[logical_cpu
] = POLARIZATION_UNKNWN
;
342 cpu_set(logical_cpu
, cpu_present_map
);
343 if (cpu
>= info
->configured
)
344 smp_cpu_state
[logical_cpu
] = CPU_STATE_STANDBY
;
346 smp_cpu_state
[logical_cpu
] = CPU_STATE_CONFIGURED
;
347 logical_cpu
= next_cpu(logical_cpu
, avail
);
348 if (logical_cpu
== NR_CPUS
)
356 static int __smp_rescan_cpus(void)
360 cpus_xor(avail
, cpu_possible_map
, cpu_present_map
);
361 if (smp_use_sigp_detection
)
362 return smp_rescan_cpus_sigp(avail
);
364 return smp_rescan_cpus_sclp(avail
);
367 static void __init
smp_detect_cpus(void)
369 unsigned int cpu
, c_cpus
, s_cpus
;
370 struct sclp_cpu_info
*info
;
371 u16 boot_cpu_addr
, cpu_addr
;
375 boot_cpu_addr
= __cpu_logical_map
[0];
376 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
378 panic("smp_detect_cpus failed to allocate memory\n");
379 /* Use sigp detection algorithm if sclp doesn't work. */
380 if (sclp_get_cpu_info(info
)) {
381 smp_use_sigp_detection
= 1;
382 for (cpu
= 0; cpu
<= 65535; cpu
++) {
383 if (cpu
== boot_cpu_addr
)
385 __cpu_logical_map
[CPU_INIT_NO
] = cpu
;
386 if (!cpu_stopped(CPU_INIT_NO
))
388 smp_get_save_area(c_cpus
, cpu
);
394 if (info
->has_cpu_type
) {
395 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
396 if (info
->cpu
[cpu
].address
== boot_cpu_addr
) {
397 smp_cpu_type
= info
->cpu
[cpu
].type
;
403 for (cpu
= 0; cpu
< info
->combined
; cpu
++) {
404 if (info
->has_cpu_type
&& info
->cpu
[cpu
].type
!= smp_cpu_type
)
406 cpu_addr
= info
->cpu
[cpu
].address
;
407 if (cpu_addr
== boot_cpu_addr
)
409 __cpu_logical_map
[CPU_INIT_NO
] = cpu_addr
;
410 if (!cpu_stopped(CPU_INIT_NO
)) {
414 smp_get_save_area(c_cpus
, cpu_addr
);
419 pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus
, s_cpus
);
426 * Activate a secondary processor.
428 int __cpuinit
start_secondary(void *cpuvoid
)
433 /* Enable TOD clock interrupts on the secondary cpu. */
435 /* Enable cpu timer interrupts on the secondary cpu. */
437 /* Enable pfault pseudo page faults on this cpu. */
440 /* call cpu notifiers */
441 notify_cpu_starting(smp_processor_id());
442 /* Mark this cpu as online */
444 cpu_set(smp_processor_id(), cpu_online_map
);
446 /* Switch on interrupts */
448 /* Print info about this processor */
450 /* cpu_idle will call schedule for us */
455 static void __init
smp_create_idle(unsigned int cpu
)
457 struct task_struct
*p
;
460 * don't care about the psw and regs settings since we'll never
461 * reschedule the forked task.
465 panic("failed fork for CPU %u: %li", cpu
, PTR_ERR(p
));
466 current_set
[cpu
] = p
;
469 static int __cpuinit
smp_alloc_lowcore(int cpu
)
471 unsigned long async_stack
, panic_stack
;
472 struct _lowcore
*lowcore
;
475 lc_order
= sizeof(long) == 8 ? 1 : 0;
476 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, lc_order
);
479 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
480 panic_stack
= __get_free_page(GFP_KERNEL
);
481 if (!panic_stack
|| !async_stack
)
483 memcpy(lowcore
, &S390_lowcore
, 512);
484 memset((char *)lowcore
+ 512, 0, sizeof(*lowcore
) - 512);
485 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
486 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
489 if (MACHINE_HAS_IEEE
) {
490 unsigned long save_area
;
492 save_area
= get_zeroed_page(GFP_KERNEL
);
495 lowcore
->extended_save_area_addr
= (u32
) save_area
;
498 if (vdso_alloc_per_cpu(cpu
, lowcore
))
501 lowcore_ptr
[cpu
] = lowcore
;
505 free_page(panic_stack
);
506 free_pages(async_stack
, ASYNC_ORDER
);
507 free_pages((unsigned long) lowcore
, lc_order
);
511 #ifdef CONFIG_HOTPLUG_CPU
512 static void smp_free_lowcore(int cpu
)
514 struct _lowcore
*lowcore
;
517 lc_order
= sizeof(long) == 8 ? 1 : 0;
518 lowcore
= lowcore_ptr
[cpu
];
520 if (MACHINE_HAS_IEEE
)
521 free_page((unsigned long) lowcore
->extended_save_area_addr
);
523 vdso_free_per_cpu(cpu
, lowcore
);
525 free_page(lowcore
->panic_stack
- PAGE_SIZE
);
526 free_pages(lowcore
->async_stack
- ASYNC_SIZE
, ASYNC_ORDER
);
527 free_pages((unsigned long) lowcore
, lc_order
);
528 lowcore_ptr
[cpu
] = NULL
;
530 #endif /* CONFIG_HOTPLUG_CPU */
532 /* Upping and downing of CPUs */
533 int __cpuinit
__cpu_up(unsigned int cpu
)
535 struct task_struct
*idle
;
536 struct _lowcore
*cpu_lowcore
;
537 struct stack_frame
*sf
;
540 if (smp_cpu_state
[cpu
] != CPU_STATE_CONFIGURED
)
542 if (smp_alloc_lowcore(cpu
))
545 ccode
= signal_processor_p((__u32
)(unsigned long)(lowcore_ptr
[cpu
]),
546 cpu
, sigp_set_prefix
);
550 idle
= current_set
[cpu
];
551 cpu_lowcore
= lowcore_ptr
[cpu
];
552 cpu_lowcore
->kernel_stack
= (unsigned long)
553 task_stack_page(idle
) + THREAD_SIZE
;
554 cpu_lowcore
->thread_info
= (unsigned long) task_thread_info(idle
);
555 sf
= (struct stack_frame
*) (cpu_lowcore
->kernel_stack
556 - sizeof(struct pt_regs
)
557 - sizeof(struct stack_frame
));
558 memset(sf
, 0, sizeof(struct stack_frame
));
559 sf
->gprs
[9] = (unsigned long) sf
;
560 cpu_lowcore
->save_area
[15] = (unsigned long) sf
;
561 __ctl_store(cpu_lowcore
->cregs_save_area
, 0, 15);
564 : : "a" (&cpu_lowcore
->access_regs_save_area
) : "memory");
565 cpu_lowcore
->percpu_offset
= __per_cpu_offset
[cpu
];
566 cpu_lowcore
->current_task
= (unsigned long) idle
;
567 cpu_lowcore
->cpu_nr
= cpu
;
568 cpu_lowcore
->kernel_asce
= S390_lowcore
.kernel_asce
;
571 while (signal_processor(cpu
, sigp_restart
) == sigp_busy
)
574 while (!cpu_online(cpu
))
579 static int __init
setup_possible_cpus(char *s
)
583 pcpus
= simple_strtoul(s
, NULL
, 0);
584 cpu_possible_map
= cpumask_of_cpu(0);
585 for (cpu
= 1; cpu
< pcpus
&& cpu
< NR_CPUS
; cpu
++)
586 cpu_set(cpu
, cpu_possible_map
);
589 early_param("possible_cpus", setup_possible_cpus
);
591 #ifdef CONFIG_HOTPLUG_CPU
593 int __cpu_disable(void)
595 struct ec_creg_mask_parms cr_parms
;
596 int cpu
= smp_processor_id();
598 cpu_clear(cpu
, cpu_online_map
);
600 /* Disable pfault pseudo page faults on this cpu. */
603 memset(&cr_parms
.orvals
, 0, sizeof(cr_parms
.orvals
));
604 memset(&cr_parms
.andvals
, 0xff, sizeof(cr_parms
.andvals
));
606 /* disable all external interrupts */
607 cr_parms
.orvals
[0] = 0;
608 cr_parms
.andvals
[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
609 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4);
610 /* disable all I/O interrupts */
611 cr_parms
.orvals
[6] = 0;
612 cr_parms
.andvals
[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
613 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
614 /* disable most machine checks */
615 cr_parms
.orvals
[14] = 0;
616 cr_parms
.andvals
[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
619 smp_ctl_bit_callback(&cr_parms
);
624 void __cpu_die(unsigned int cpu
)
626 /* Wait until target cpu is down */
627 while (!smp_cpu_not_running(cpu
))
629 smp_free_lowcore(cpu
);
630 pr_info("Processor %d stopped\n", cpu
);
636 signal_processor(smp_processor_id(), sigp_stop
);
641 #endif /* CONFIG_HOTPLUG_CPU */
643 void __init
smp_prepare_cpus(unsigned int max_cpus
)
646 unsigned long save_area
= 0;
648 unsigned long async_stack
, panic_stack
;
649 struct _lowcore
*lowcore
;
655 /* request the 0x1201 emergency signal external interrupt */
656 if (register_external_interrupt(0x1201, do_ext_call_interrupt
) != 0)
657 panic("Couldn't request external interrupt 0x1201");
660 /* Reallocate current lowcore, but keep its contents. */
661 lc_order
= sizeof(long) == 8 ? 1 : 0;
662 lowcore
= (void *) __get_free_pages(GFP_KERNEL
| GFP_DMA
, lc_order
);
663 panic_stack
= __get_free_page(GFP_KERNEL
);
664 async_stack
= __get_free_pages(GFP_KERNEL
, ASYNC_ORDER
);
665 BUG_ON(!lowcore
|| !panic_stack
|| !async_stack
);
667 if (MACHINE_HAS_IEEE
)
668 save_area
= get_zeroed_page(GFP_KERNEL
);
671 local_mcck_disable();
672 lowcore_ptr
[smp_processor_id()] = lowcore
;
673 *lowcore
= S390_lowcore
;
674 lowcore
->panic_stack
= panic_stack
+ PAGE_SIZE
;
675 lowcore
->async_stack
= async_stack
+ ASYNC_SIZE
;
677 if (MACHINE_HAS_IEEE
)
678 lowcore
->extended_save_area_addr
= (u32
) save_area
;
680 if (vdso_alloc_per_cpu(smp_processor_id(), lowcore
))
683 set_prefix((u32
)(unsigned long) lowcore
);
686 for_each_possible_cpu(cpu
)
687 if (cpu
!= smp_processor_id())
688 smp_create_idle(cpu
);
691 void __init
smp_prepare_boot_cpu(void)
693 BUG_ON(smp_processor_id() != 0);
695 current_thread_info()->cpu
= 0;
696 cpu_set(0, cpu_present_map
);
697 cpu_set(0, cpu_online_map
);
698 S390_lowcore
.percpu_offset
= __per_cpu_offset
[0];
699 current_set
[0] = current
;
700 smp_cpu_state
[0] = CPU_STATE_CONFIGURED
;
701 smp_cpu_polarization
[0] = POLARIZATION_UNKNWN
;
704 void __init
smp_cpus_done(unsigned int max_cpus
)
709 * the frequency of the profiling timer can be changed
710 * by writing a multiplier value into /proc/profile.
712 * usually you want to run this on all CPUs ;)
714 int setup_profiling_timer(unsigned int multiplier
)
719 #ifdef CONFIG_HOTPLUG_CPU
720 static ssize_t
cpu_configure_show(struct sys_device
*dev
,
721 struct sysdev_attribute
*attr
, char *buf
)
725 mutex_lock(&smp_cpu_state_mutex
);
726 count
= sprintf(buf
, "%d\n", smp_cpu_state
[dev
->id
]);
727 mutex_unlock(&smp_cpu_state_mutex
);
731 static ssize_t
cpu_configure_store(struct sys_device
*dev
,
732 struct sysdev_attribute
*attr
,
733 const char *buf
, size_t count
)
739 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
741 if (val
!= 0 && val
!= 1)
745 mutex_lock(&smp_cpu_state_mutex
);
752 if (smp_cpu_state
[cpu
] == CPU_STATE_CONFIGURED
) {
753 rc
= sclp_cpu_deconfigure(__cpu_logical_map
[cpu
]);
755 smp_cpu_state
[cpu
] = CPU_STATE_STANDBY
;
756 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
761 if (smp_cpu_state
[cpu
] == CPU_STATE_STANDBY
) {
762 rc
= sclp_cpu_configure(__cpu_logical_map
[cpu
]);
764 smp_cpu_state
[cpu
] = CPU_STATE_CONFIGURED
;
765 smp_cpu_polarization
[cpu
] = POLARIZATION_UNKNWN
;
773 mutex_unlock(&smp_cpu_state_mutex
);
775 return rc
? rc
: count
;
777 static SYSDEV_ATTR(configure
, 0644, cpu_configure_show
, cpu_configure_store
);
778 #endif /* CONFIG_HOTPLUG_CPU */
780 static ssize_t
cpu_polarization_show(struct sys_device
*dev
,
781 struct sysdev_attribute
*attr
, char *buf
)
786 mutex_lock(&smp_cpu_state_mutex
);
787 switch (smp_cpu_polarization
[cpu
]) {
788 case POLARIZATION_HRZ
:
789 count
= sprintf(buf
, "horizontal\n");
791 case POLARIZATION_VL
:
792 count
= sprintf(buf
, "vertical:low\n");
794 case POLARIZATION_VM
:
795 count
= sprintf(buf
, "vertical:medium\n");
797 case POLARIZATION_VH
:
798 count
= sprintf(buf
, "vertical:high\n");
801 count
= sprintf(buf
, "unknown\n");
804 mutex_unlock(&smp_cpu_state_mutex
);
807 static SYSDEV_ATTR(polarization
, 0444, cpu_polarization_show
, NULL
);
809 static ssize_t
show_cpu_address(struct sys_device
*dev
,
810 struct sysdev_attribute
*attr
, char *buf
)
812 return sprintf(buf
, "%d\n", __cpu_logical_map
[dev
->id
]);
814 static SYSDEV_ATTR(address
, 0444, show_cpu_address
, NULL
);
817 static struct attribute
*cpu_common_attrs
[] = {
818 #ifdef CONFIG_HOTPLUG_CPU
819 &attr_configure
.attr
,
822 &attr_polarization
.attr
,
826 static struct attribute_group cpu_common_attr_group
= {
827 .attrs
= cpu_common_attrs
,
830 static ssize_t
show_capability(struct sys_device
*dev
,
831 struct sysdev_attribute
*attr
, char *buf
)
833 unsigned int capability
;
836 rc
= get_cpu_capability(&capability
);
839 return sprintf(buf
, "%u\n", capability
);
841 static SYSDEV_ATTR(capability
, 0444, show_capability
, NULL
);
843 static ssize_t
show_idle_count(struct sys_device
*dev
,
844 struct sysdev_attribute
*attr
, char *buf
)
846 struct s390_idle_data
*idle
;
847 unsigned long long idle_count
;
849 idle
= &per_cpu(s390_idle
, dev
->id
);
850 spin_lock(&idle
->lock
);
851 idle_count
= idle
->idle_count
;
852 if (idle
->idle_enter
)
854 spin_unlock(&idle
->lock
);
855 return sprintf(buf
, "%llu\n", idle_count
);
857 static SYSDEV_ATTR(idle_count
, 0444, show_idle_count
, NULL
);
859 static ssize_t
show_idle_time(struct sys_device
*dev
,
860 struct sysdev_attribute
*attr
, char *buf
)
862 struct s390_idle_data
*idle
;
863 unsigned long long now
, idle_time
, idle_enter
;
865 idle
= &per_cpu(s390_idle
, dev
->id
);
866 spin_lock(&idle
->lock
);
868 idle_time
= idle
->idle_time
;
869 idle_enter
= idle
->idle_enter
;
870 if (idle_enter
!= 0ULL && idle_enter
< now
)
871 idle_time
+= now
- idle_enter
;
872 spin_unlock(&idle
->lock
);
873 return sprintf(buf
, "%llu\n", idle_time
>> 12);
875 static SYSDEV_ATTR(idle_time_us
, 0444, show_idle_time
, NULL
);
877 static struct attribute
*cpu_online_attrs
[] = {
878 &attr_capability
.attr
,
879 &attr_idle_count
.attr
,
880 &attr_idle_time_us
.attr
,
884 static struct attribute_group cpu_online_attr_group
= {
885 .attrs
= cpu_online_attrs
,
888 static int __cpuinit
smp_cpu_notify(struct notifier_block
*self
,
889 unsigned long action
, void *hcpu
)
891 unsigned int cpu
= (unsigned int)(long)hcpu
;
892 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
893 struct sys_device
*s
= &c
->sysdev
;
894 struct s390_idle_data
*idle
;
898 case CPU_ONLINE_FROZEN
:
899 idle
= &per_cpu(s390_idle
, cpu
);
900 spin_lock_irq(&idle
->lock
);
901 idle
->idle_enter
= 0;
903 idle
->idle_count
= 0;
904 spin_unlock_irq(&idle
->lock
);
905 if (sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
))
909 case CPU_DEAD_FROZEN
:
910 sysfs_remove_group(&s
->kobj
, &cpu_online_attr_group
);
916 static struct notifier_block __cpuinitdata smp_cpu_nb
= {
917 .notifier_call
= smp_cpu_notify
,
920 static int __devinit
smp_add_present_cpu(int cpu
)
922 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
923 struct sys_device
*s
= &c
->sysdev
;
927 rc
= register_cpu(c
, cpu
);
930 rc
= sysfs_create_group(&s
->kobj
, &cpu_common_attr_group
);
933 if (!cpu_online(cpu
))
935 rc
= sysfs_create_group(&s
->kobj
, &cpu_online_attr_group
);
938 sysfs_remove_group(&s
->kobj
, &cpu_common_attr_group
);
940 #ifdef CONFIG_HOTPLUG_CPU
947 #ifdef CONFIG_HOTPLUG_CPU
949 int __ref
smp_rescan_cpus(void)
956 mutex_lock(&smp_cpu_state_mutex
);
957 newcpus
= cpu_present_map
;
958 rc
= __smp_rescan_cpus();
961 cpus_andnot(newcpus
, cpu_present_map
, newcpus
);
962 for_each_cpu_mask(cpu
, newcpus
) {
963 rc
= smp_add_present_cpu(cpu
);
965 cpu_clear(cpu
, cpu_present_map
);
969 mutex_unlock(&smp_cpu_state_mutex
);
971 if (!cpus_empty(newcpus
))
972 topology_schedule_update();
976 static ssize_t __ref
rescan_store(struct sysdev_class
*class, const char *buf
,
981 rc
= smp_rescan_cpus();
982 return rc
? rc
: count
;
984 static SYSDEV_CLASS_ATTR(rescan
, 0200, NULL
, rescan_store
);
985 #endif /* CONFIG_HOTPLUG_CPU */
987 static ssize_t
dispatching_show(struct sysdev_class
*class, char *buf
)
991 mutex_lock(&smp_cpu_state_mutex
);
992 count
= sprintf(buf
, "%d\n", cpu_management
);
993 mutex_unlock(&smp_cpu_state_mutex
);
997 static ssize_t
dispatching_store(struct sysdev_class
*dev
, const char *buf
,
1003 if (sscanf(buf
, "%d %c", &val
, &delim
) != 1)
1005 if (val
!= 0 && val
!= 1)
1009 mutex_lock(&smp_cpu_state_mutex
);
1010 if (cpu_management
== val
)
1012 rc
= topology_set_cpu_management(val
);
1014 cpu_management
= val
;
1016 mutex_unlock(&smp_cpu_state_mutex
);
1018 return rc
? rc
: count
;
1020 static SYSDEV_CLASS_ATTR(dispatching
, 0644, dispatching_show
,
1023 static int __init
topology_init(void)
1028 register_cpu_notifier(&smp_cpu_nb
);
1030 #ifdef CONFIG_HOTPLUG_CPU
1031 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_rescan
);
1035 rc
= sysdev_class_create_file(&cpu_sysdev_class
, &attr_dispatching
);
1038 for_each_present_cpu(cpu
) {
1039 rc
= smp_add_present_cpu(cpu
);
1045 subsys_initcall(topology_init
);