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-rw-r--r--arch/arm/kernel/smp.c131
1 files changed, 94 insertions, 37 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 6014dfd22af4..de885fd256c5 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -22,16 +22,20 @@
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
+#include <linux/percpu.h>
+#include <linux/clockchips.h>
#include <asm/atomic.h>
#include <asm/cacheflush.h>
#include <asm/cpu.h>
+#include <asm/cputype.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
+#include <asm/localtimer.h>
/*
* as from 2.5, kernels no longer have an init_tasks structure
@@ -163,7 +167,7 @@ int __cpuexit __cpu_disable(void)
* Take this CPU offline. Once we clear this, we can't return,
* and we must not schedule until we're ready to give up the cpu.
*/
- cpu_clear(cpu, cpu_online_map);
+ set_cpu_online(cpu, false);
/*
* OK - migrate IRQs away from this CPU
@@ -274,9 +278,9 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
local_fiq_enable();
/*
- * Setup local timer for this CPU.
+ * Setup the percpu timer for this CPU.
*/
- local_timer_setup();
+ percpu_timer_setup();
calibrate_delay();
@@ -285,7 +289,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
/*
* OK, now it's safe to let the boot CPU continue
*/
- cpu_set(cpu, cpu_online_map);
+ set_cpu_online(cpu, true);
/*
* OK, it's off to the idle thread for us
@@ -383,10 +387,16 @@ void show_local_irqs(struct seq_file *p)
seq_putc(p, '\n');
}
+/*
+ * Timer (local or broadcast) support
+ */
+static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);
+
static void ipi_timer(void)
{
+ struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent);
irq_enter();
- local_timer_interrupt();
+ evt->event_handler(evt);
irq_exit();
}
@@ -405,6 +415,42 @@ asmlinkage void __exception do_local_timer(struct pt_regs *regs)
}
#endif
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+static void smp_timer_broadcast(const struct cpumask *mask)
+{
+ send_ipi_message(mask, IPI_TIMER);
+}
+
+static void broadcast_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+}
+
+static void local_timer_setup(struct clock_event_device *evt)
+{
+ evt->name = "dummy_timer";
+ evt->features = CLOCK_EVT_FEAT_ONESHOT |
+ CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_DUMMY;
+ evt->rating = 400;
+ evt->mult = 1;
+ evt->set_mode = broadcast_timer_set_mode;
+ evt->broadcast = smp_timer_broadcast;
+
+ clockevents_register_device(evt);
+}
+#endif
+
+void __cpuinit percpu_timer_setup(void)
+{
+ unsigned int cpu = smp_processor_id();
+ struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
+
+ evt->cpumask = cpumask_of(cpu);
+
+ local_timer_setup(evt);
+}
+
static DEFINE_SPINLOCK(stop_lock);
/*
@@ -417,7 +463,7 @@ static void ipi_cpu_stop(unsigned int cpu)
dump_stack();
spin_unlock(&stop_lock);
- cpu_clear(cpu, cpu_online_map);
+ set_cpu_online(cpu, false);
local_fiq_disable();
local_irq_disable();
@@ -501,11 +547,6 @@ void smp_send_reschedule(int cpu)
send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
}
-void smp_timer_broadcast(const struct cpumask *mask)
-{
- send_ipi_message(mask, IPI_TIMER);
-}
-
void smp_send_stop(void)
{
cpumask_t mask = cpu_online_map;
@@ -545,6 +586,12 @@ struct tlb_args {
unsigned long ta_end;
};
+/* all SMP configurations have the extended CPUID registers */
+static inline int tlb_ops_need_broadcast(void)
+{
+ return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2;
+}
+
static inline void ipi_flush_tlb_all(void *ignored)
{
local_flush_tlb_all();
@@ -587,51 +634,61 @@ static inline void ipi_flush_tlb_kernel_range(void *arg)
void flush_tlb_all(void)
{
- on_each_cpu(ipi_flush_tlb_all, NULL, 1);
+ if (tlb_ops_need_broadcast())
+ on_each_cpu(ipi_flush_tlb_all, NULL, 1);
+ else
+ local_flush_tlb_all();
}
void flush_tlb_mm(struct mm_struct *mm)
{
- on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, &mm->cpu_vm_mask);
+ if (tlb_ops_need_broadcast())
+ on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, &mm->cpu_vm_mask);
+ else
+ local_flush_tlb_mm(mm);
}
void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
- struct tlb_args ta;
-
- ta.ta_vma = vma;
- ta.ta_start = uaddr;
-
- on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, &vma->vm_mm->cpu_vm_mask);
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_vma = vma;
+ ta.ta_start = uaddr;
+ on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, &vma->vm_mm->cpu_vm_mask);
+ } else
+ local_flush_tlb_page(vma, uaddr);
}
void flush_tlb_kernel_page(unsigned long kaddr)
{
- struct tlb_args ta;
-
- ta.ta_start = kaddr;
-
- on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_start = kaddr;
+ on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
+ } else
+ local_flush_tlb_kernel_page(kaddr);
}
void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
- struct tlb_args ta;
-
- ta.ta_vma = vma;
- ta.ta_start = start;
- ta.ta_end = end;
-
- on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, &vma->vm_mm->cpu_vm_mask);
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_vma = vma;
+ ta.ta_start = start;
+ ta.ta_end = end;
+ on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, &vma->vm_mm->cpu_vm_mask);
+ } else
+ local_flush_tlb_range(vma, start, end);
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
- struct tlb_args ta;
-
- ta.ta_start = start;
- ta.ta_end = end;
-
- on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
+ if (tlb_ops_need_broadcast()) {
+ struct tlb_args ta;
+ ta.ta_start = start;
+ ta.ta_end = end;
+ on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
+ } else
+ local_flush_tlb_kernel_range(start, end);
}