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-rw-r--r--arch/s390/kernel/process.c70
-rw-r--r--arch/s390/kernel/s390_ext.c4
-rw-r--r--arch/s390/kernel/smp.c1
-rw-r--r--arch/s390/kernel/traps.c2
-rw-r--r--drivers/s390/cio/cio.c3
-rw-r--r--include/asm-s390/cpu.h8
6 files changed, 42 insertions, 46 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index ce20315..eb768ce8 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -76,6 +76,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
* Need to know about CPUs going idle?
*/
static ATOMIC_NOTIFIER_HEAD(idle_chain);
+DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
int register_idle_notifier(struct notifier_block *nb)
{
@@ -89,9 +90,33 @@ int unregister_idle_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL(unregister_idle_notifier);
-void do_monitor_call(struct pt_regs *regs, long interruption_code)
+static int s390_idle_enter(void)
+{
+ struct s390_idle_data *idle;
+ int nr_calls = 0;
+ void *hcpu;
+ int rc;
+
+ hcpu = (void *)(long)smp_processor_id();
+ rc = __atomic_notifier_call_chain(&idle_chain, S390_CPU_IDLE, hcpu, -1,
+ &nr_calls);
+ if (rc == NOTIFY_BAD) {
+ nr_calls--;
+ __atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
+ hcpu, nr_calls, NULL);
+ return rc;
+ }
+ idle = &__get_cpu_var(s390_idle);
+ spin_lock(&idle->lock);
+ idle->idle_count++;
+ idle->in_idle = 1;
+ idle->idle_enter = get_clock();
+ spin_unlock(&idle->lock);
+ return NOTIFY_OK;
+}
+
+void s390_idle_leave(void)
{
-#ifdef CONFIG_SMP
struct s390_idle_data *idle;
idle = &__get_cpu_var(s390_idle);
@@ -99,10 +124,6 @@ void do_monitor_call(struct pt_regs *regs, long interruption_code)
idle->idle_time += get_clock() - idle->idle_enter;
idle->in_idle = 0;
spin_unlock(&idle->lock);
-#endif
- /* disable monitor call class 0 */
- __ctl_clear_bit(8, 15);
-
atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
(void *)(long) smp_processor_id());
}
@@ -113,61 +134,30 @@ extern void s390_handle_mcck(void);
*/
static void default_idle(void)
{
- int cpu, rc;
- int nr_calls = 0;
- void *hcpu;
-#ifdef CONFIG_SMP
- struct s390_idle_data *idle;
-#endif
-
/* CPU is going idle. */
- cpu = smp_processor_id();
- hcpu = (void *)(long)cpu;
local_irq_disable();
if (need_resched()) {
local_irq_enable();
return;
}
-
- rc = __atomic_notifier_call_chain(&idle_chain, S390_CPU_IDLE, hcpu, -1,
- &nr_calls);
- if (rc == NOTIFY_BAD) {
- nr_calls--;
- __atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
- hcpu, nr_calls, NULL);
+ if (s390_idle_enter() == NOTIFY_BAD) {
local_irq_enable();
return;
}
-
- /* enable monitor call class 0 */
- __ctl_set_bit(8, 15);
-
#ifdef CONFIG_HOTPLUG_CPU
- if (cpu_is_offline(cpu)) {
+ if (cpu_is_offline(smp_processor_id())) {
preempt_enable_no_resched();
cpu_die();
}
#endif
-
local_mcck_disable();
if (test_thread_flag(TIF_MCCK_PENDING)) {
local_mcck_enable();
- /* disable monitor call class 0 */
- __ctl_clear_bit(8, 15);
- atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
- hcpu);
+ s390_idle_leave();
local_irq_enable();
s390_handle_mcck();
return;
}
-#ifdef CONFIG_SMP
- idle = &__get_cpu_var(s390_idle);
- spin_lock(&idle->lock);
- idle->idle_count++;
- idle->in_idle = 1;
- idle->idle_enter = get_clock();
- spin_unlock(&idle->lock);
-#endif
trace_hardirqs_on();
/* Wait for external, I/O or machine check interrupt. */
__load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |
diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c
index acf93db..3a8772d 100644
--- a/arch/s390/kernel/s390_ext.c
+++ b/arch/s390/kernel/s390_ext.c
@@ -13,7 +13,7 @@
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
-
+#include <asm/cpu.h>
#include <asm/lowcore.h>
#include <asm/s390_ext.h>
#include <asm/irq_regs.h>
@@ -119,7 +119,7 @@ void do_extint(struct pt_regs *regs, unsigned short code)
old_regs = set_irq_regs(regs);
irq_enter();
- asm volatile ("mc 0,0");
+ s390_idle_check();
if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
/**
* Make sure that the i/o interrupt did not "overtake"
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index d1e8e8a..5a445b1 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -73,7 +73,6 @@ static int smp_cpu_state[NR_CPUS];
static int cpu_management;
static DEFINE_PER_CPU(struct cpu, cpu_devices);
-DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
static void smp_ext_bitcall(int, ec_bit_sig);
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 60f728a..9452a20 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -59,7 +59,6 @@ int sysctl_userprocess_debug = 0;
extern pgm_check_handler_t do_protection_exception;
extern pgm_check_handler_t do_dat_exception;
-extern pgm_check_handler_t do_monitor_call;
extern pgm_check_handler_t do_asce_exception;
#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
@@ -739,6 +738,5 @@ void __init trap_init(void)
pgm_check_table[0x15] = &operand_exception;
pgm_check_table[0x1C] = &space_switch_exception;
pgm_check_table[0x1D] = &hfp_sqrt_exception;
- pgm_check_table[0x40] = &do_monitor_call;
pfault_irq_init();
}
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 60590a1..6dbe948 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -24,6 +24,7 @@
#include <asm/ipl.h>
#include <asm/chpid.h>
#include <asm/airq.h>
+#include <asm/cpu.h>
#include "cio.h"
#include "css.h"
#include "chsc.h"
@@ -649,7 +650,7 @@ do_IRQ (struct pt_regs *regs)
old_regs = set_irq_regs(regs);
irq_enter();
- asm volatile ("mc 0,0");
+ s390_idle_check();
if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
/**
* Make sure that the i/o interrupt did not "overtake"
diff --git a/include/asm-s390/cpu.h b/include/asm-s390/cpu.h
index 352dde1..e5a6a9b 100644
--- a/include/asm-s390/cpu.h
+++ b/include/asm-s390/cpu.h
@@ -22,4 +22,12 @@ struct s390_idle_data {
DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
+void s390_idle_leave(void);
+
+static inline void s390_idle_check(void)
+{
+ if ((&__get_cpu_var(s390_idle))->in_idle)
+ s390_idle_leave();
+}
+
#endif /* _ASM_S390_CPU_H_ */
generated by cgit v0.10.2 at 2024-11-14 19:35:38 (GMT)