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-rw-r--r--arch/s390/kernel/Makefile2
-rw-r--r--arch/s390/kernel/asm-offsets.c2
-rw-r--r--arch/s390/kernel/entry.h2
-rw-r--r--arch/s390/kernel/idle.c124
-rw-r--r--arch/s390/kernel/process.c24
-rw-r--r--arch/s390/kernel/smp.c39
-rw-r--r--arch/s390/kernel/vtime.c60
7 files changed, 130 insertions, 123 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 3249e1f36d55..c249785669f3 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -28,7 +28,7 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w
-obj-y := traps.o time.o process.o base.o early.o setup.o vtime.o
+obj-y := traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
obj-y += debug.o irq.o ipl.o dis.o diag.o sclp.o vdso.o
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 3e9e479d9b49..ef279a136801 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -9,7 +9,7 @@
#include <linux/kbuild.h>
#include <linux/kvm_host.h>
#include <linux/sched.h>
-#include <asm/cputime.h>
+#include <asm/idle.h>
#include <asm/vdso.h>
#include <asm/pgtable.h>
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h
index 58541633b8d6..cd68869f9504 100644
--- a/arch/s390/kernel/entry.h
+++ b/arch/s390/kernel/entry.h
@@ -4,7 +4,7 @@
#include <linux/types.h>
#include <linux/signal.h>
#include <asm/ptrace.h>
-#include <asm/cputime.h>
+#include <asm/idle.h>
extern void *restart_stack;
extern unsigned long suspend_zero_pages;
diff --git a/arch/s390/kernel/idle.c b/arch/s390/kernel/idle.c
new file mode 100644
index 000000000000..c846aee7372f
--- /dev/null
+++ b/arch/s390/kernel/idle.c
@@ -0,0 +1,124 @@
+/*
+ * Idle functions for s390.
+ *
+ * Copyright IBM Corp. 2014
+ *
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/kprobes.h>
+#include <linux/notifier.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <asm/cputime.h>
+#include <asm/nmi.h>
+#include <asm/smp.h>
+#include "entry.h"
+
+static DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
+
+void __kprobes enabled_wait(void)
+{
+ struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
+ unsigned long long idle_time;
+ unsigned long psw_mask;
+
+ trace_hardirqs_on();
+
+ /* Wait for external, I/O or machine check interrupt. */
+ psw_mask = PSW_KERNEL_BITS | PSW_MASK_WAIT | PSW_MASK_DAT |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
+ clear_cpu_flag(CIF_NOHZ_DELAY);
+
+ /* Call the assembler magic in entry.S */
+ psw_idle(idle, psw_mask);
+
+ /* Account time spent with enabled wait psw loaded as idle time. */
+ idle->sequence++;
+ smp_wmb();
+ idle_time = idle->clock_idle_exit - idle->clock_idle_enter;
+ idle->clock_idle_enter = idle->clock_idle_exit = 0ULL;
+ idle->idle_time += idle_time;
+ idle->idle_count++;
+ account_idle_time(idle_time);
+ smp_wmb();
+ idle->sequence++;
+}
+
+static ssize_t show_idle_count(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
+ unsigned long long idle_count;
+ unsigned int sequence;
+
+ do {
+ sequence = ACCESS_ONCE(idle->sequence);
+ idle_count = ACCESS_ONCE(idle->idle_count);
+ if (ACCESS_ONCE(idle->clock_idle_enter))
+ idle_count++;
+ } while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
+ return sprintf(buf, "%llu\n", idle_count);
+}
+DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL);
+
+static ssize_t show_idle_time(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
+ unsigned long long now, idle_time, idle_enter, idle_exit;
+ unsigned int sequence;
+
+ do {
+ now = get_tod_clock();
+ sequence = ACCESS_ONCE(idle->sequence);
+ idle_time = ACCESS_ONCE(idle->idle_time);
+ idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
+ idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
+ } while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
+ idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
+ return sprintf(buf, "%llu\n", idle_time >> 12);
+}
+DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
+
+cputime64_t arch_cpu_idle_time(int cpu)
+{
+ struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
+ unsigned long long now, idle_enter, idle_exit;
+ unsigned int sequence;
+
+ do {
+ now = get_tod_clock();
+ sequence = ACCESS_ONCE(idle->sequence);
+ idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
+ idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
+ } while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
+ return idle_enter ? ((idle_exit ?: now) - idle_enter) : 0;
+}
+
+void arch_cpu_idle_enter(void)
+{
+ local_mcck_disable();
+}
+
+void arch_cpu_idle(void)
+{
+ if (!test_cpu_flag(CIF_MCCK_PENDING))
+ /* Halt the cpu and keep track of cpu time accounting. */
+ enabled_wait();
+ local_irq_enable();
+}
+
+void arch_cpu_idle_exit(void)
+{
+ local_mcck_enable();
+ if (test_cpu_flag(CIF_MCCK_PENDING))
+ s390_handle_mcck();
+}
+
+void arch_cpu_idle_dead(void)
+{
+ cpu_die();
+}
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 93b9ca42e5c0..ed84cc224899 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -61,30 +61,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
return sf->gprs[8];
}
-void arch_cpu_idle(void)
-{
- local_mcck_disable();
- if (test_cpu_flag(CIF_MCCK_PENDING)) {
- local_mcck_enable();
- local_irq_enable();
- return;
- }
- /* Halt the cpu and keep track of cpu time accounting. */
- vtime_stop_cpu();
- local_irq_enable();
-}
-
-void arch_cpu_idle_exit(void)
-{
- if (test_cpu_flag(CIF_MCCK_PENDING))
- s390_handle_mcck();
-}
-
-void arch_cpu_idle_dead(void)
-{
- cpu_die();
-}
-
extern void __kprobes kernel_thread_starter(void);
/*
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 46317d6951c4..bba0e2469254 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -45,6 +45,7 @@
#include <asm/debug.h>
#include <asm/os_info.h>
#include <asm/sigp.h>
+#include <asm/idle.h>
#include "entry.h"
enum {
@@ -661,7 +662,7 @@ static void smp_start_secondary(void *cpuvoid)
cpu_init();
preempt_disable();
init_cpu_timer();
- init_cpu_vtimer();
+ vtime_init();
pfault_init();
notify_cpu_starting(smp_processor_id());
set_cpu_online(smp_processor_id(), true);
@@ -893,42 +894,6 @@ static struct attribute_group cpu_common_attr_group = {
.attrs = cpu_common_attrs,
};
-static ssize_t show_idle_count(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
- unsigned long long idle_count;
- unsigned int sequence;
-
- do {
- sequence = ACCESS_ONCE(idle->sequence);
- idle_count = ACCESS_ONCE(idle->idle_count);
- if (ACCESS_ONCE(idle->clock_idle_enter))
- idle_count++;
- } while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
- return sprintf(buf, "%llu\n", idle_count);
-}
-static DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL);
-
-static ssize_t show_idle_time(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
- unsigned long long now, idle_time, idle_enter, idle_exit;
- unsigned int sequence;
-
- do {
- now = get_tod_clock();
- sequence = ACCESS_ONCE(idle->sequence);
- idle_time = ACCESS_ONCE(idle->idle_time);
- idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
- idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
- } while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
- idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
- return sprintf(buf, "%llu\n", idle_time >> 12);
-}
-static DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
-
static struct attribute *cpu_online_attrs[] = {
&dev_attr_idle_count.attr,
&dev_attr_idle_time_us.attr,
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 40709821abde..416f2a323ba5 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -6,27 +6,18 @@
*/
#include <linux/kernel_stat.h>
-#include <linux/notifier.h>
-#include <linux/kprobes.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/timex.h>
#include <linux/types.h>
#include <linux/time.h>
-#include <linux/cpu.h>
-#include <linux/smp.h>
-#include <asm/irq_regs.h>
#include <asm/cputime.h>
#include <asm/vtimer.h>
#include <asm/vtime.h>
-#include <asm/irq.h>
-#include "entry.h"
static void virt_timer_expire(void);
-DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
-
static LIST_HEAD(virt_timer_list);
static DEFINE_SPINLOCK(virt_timer_lock);
static atomic64_t virt_timer_current;
@@ -152,49 +143,6 @@ void vtime_account_system(struct task_struct *tsk)
__attribute__((alias("vtime_account_irq_enter")));
EXPORT_SYMBOL_GPL(vtime_account_system);
-void __kprobes vtime_stop_cpu(void)
-{
- struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
- unsigned long long idle_time;
- unsigned long psw_mask;
-
- trace_hardirqs_on();
-
- /* Wait for external, I/O or machine check interrupt. */
- psw_mask = PSW_KERNEL_BITS | PSW_MASK_WAIT | PSW_MASK_DAT |
- PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
- clear_cpu_flag(CIF_NOHZ_DELAY);
-
- /* Call the assembler magic in entry.S */
- psw_idle(idle, psw_mask);
-
- /* Account time spent with enabled wait psw loaded as idle time. */
- idle->sequence++;
- smp_wmb();
- idle_time = idle->clock_idle_exit - idle->clock_idle_enter;
- idle->clock_idle_enter = idle->clock_idle_exit = 0ULL;
- idle->idle_time += idle_time;
- idle->idle_count++;
- account_idle_time(idle_time);
- smp_wmb();
- idle->sequence++;
-}
-
-cputime64_t s390_get_idle_time(int cpu)
-{
- struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
- unsigned long long now, idle_enter, idle_exit;
- unsigned int sequence;
-
- do {
- now = get_tod_clock();
- sequence = ACCESS_ONCE(idle->sequence);
- idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
- idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
- } while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
- return idle_enter ? ((idle_exit ?: now) - idle_enter) : 0;
-}
-
/*
* Sorted add to a list. List is linear searched until first bigger
* element is found.
@@ -372,14 +320,8 @@ EXPORT_SYMBOL(del_virt_timer);
/*
* Start the virtual CPU timer on the current CPU.
*/
-void init_cpu_vtimer(void)
+void vtime_init(void)
{
/* set initial cpu timer */
set_vtimer(VTIMER_MAX_SLICE);
}
-
-void __init vtime_init(void)
-{
- /* Enable cpu timer interrupts on the boot cpu. */
- init_cpu_vtimer();
-}

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