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Diffstat (limited to 'arch/blackfin/mach-common/smp.c')
-rw-r--r--arch/blackfin/mach-common/smp.c88
1 files changed, 67 insertions, 21 deletions
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 369e687582b..7cecbaf0358 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -21,6 +21,7 @@
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
+#include <linux/slab.h>
#include <asm/atomic.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
@@ -122,9 +123,17 @@ static void ipi_call_function(unsigned int cpu, struct ipi_message *msg)
wait = msg->call_struct.wait;
cpu_clear(cpu, msg->call_struct.pending);
func(info);
- if (wait)
+ if (wait) {
+#ifdef __ARCH_SYNC_CORE_DCACHE
+ /*
+ * 'wait' usually means synchronization between CPUs.
+ * Invalidate D cache in case shared data was changed
+ * by func() to ensure cache coherence.
+ */
+ resync_core_dcache();
+#endif
cpu_clear(cpu, msg->call_struct.waitmask);
- else
+ } else
kfree(msg);
}
@@ -219,6 +228,13 @@ int smp_call_function(void (*func)(void *info), void *info, int wait)
blackfin_dcache_invalidate_range(
(unsigned long)(&msg->call_struct.waitmask),
(unsigned long)(&msg->call_struct.waitmask));
+#ifdef __ARCH_SYNC_CORE_DCACHE
+ /*
+ * Invalidate D cache in case shared data was changed by
+ * other processors to ensure cache coherence.
+ */
+ resync_core_dcache();
+#endif
kfree(msg);
}
return 0;
@@ -261,6 +277,13 @@ int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
blackfin_dcache_invalidate_range(
(unsigned long)(&msg->call_struct.waitmask),
(unsigned long)(&msg->call_struct.waitmask));
+#ifdef __ARCH_SYNC_CORE_DCACHE
+ /*
+ * Invalidate D cache in case shared data was changed by
+ * other processors to ensure cache coherence.
+ */
+ resync_core_dcache();
+#endif
kfree(msg);
}
return 0;
@@ -322,8 +345,11 @@ void smp_send_stop(void)
int __cpuinit __cpu_up(unsigned int cpu)
{
- struct task_struct *idle;
int ret;
+ static struct task_struct *idle;
+
+ if (idle)
+ free_task(idle);
idle = fork_idle(cpu);
if (IS_ERR(idle)) {
@@ -332,7 +358,6 @@ int __cpuinit __cpu_up(unsigned int cpu)
}
secondary_stack = task_stack_page(idle) + THREAD_SIZE;
- smp_wmb();
ret = platform_boot_secondary(cpu, idle);
@@ -343,9 +368,6 @@ int __cpuinit __cpu_up(unsigned int cpu)
static void __cpuinit setup_secondary(unsigned int cpu)
{
-#if !defined(CONFIG_TICKSOURCE_GPTMR0)
- struct irq_desc *timer_desc;
-#endif
unsigned long ilat;
bfin_write_IMASK(0);
@@ -360,17 +382,6 @@ static void __cpuinit setup_secondary(unsigned int cpu)
bfin_irq_flags |= IMASK_IVG15 |
IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
-
-#if defined(CONFIG_TICKSOURCE_GPTMR0)
- /* Power down the core timer, just to play safe. */
- bfin_write_TCNTL(0);
-
- /* system timer0 has been setup by CoreA. */
-#else
- timer_desc = irq_desc + IRQ_CORETMR;
- setup_core_timer();
- timer_desc->chip->enable(IRQ_CORETMR);
-#endif
}
void __cpuinit secondary_start_kernel(void)
@@ -405,7 +416,6 @@ void __cpuinit secondary_start_kernel(void)
atomic_inc(&mm->mm_users);
atomic_inc(&mm->mm_count);
current->active_mm = mm;
- BUG_ON(current->mm); /* Can't be, but better be safe than sorry. */
preempt_disable();
@@ -413,6 +423,9 @@ void __cpuinit secondary_start_kernel(void)
platform_secondary_init(cpu);
+ /* setup local core timer */
+ bfin_local_timer_setup();
+
local_irq_enable();
/*
@@ -462,25 +475,58 @@ void smp_icache_flush_range_others(unsigned long start, unsigned long end)
EXPORT_SYMBOL_GPL(smp_icache_flush_range_others);
#ifdef __ARCH_SYNC_CORE_ICACHE
+unsigned long icache_invld_count[NR_CPUS];
void resync_core_icache(void)
{
unsigned int cpu = get_cpu();
blackfin_invalidate_entire_icache();
- ++per_cpu(cpu_data, cpu).icache_invld_count;
+ icache_invld_count[cpu]++;
put_cpu();
}
EXPORT_SYMBOL(resync_core_icache);
#endif
#ifdef __ARCH_SYNC_CORE_DCACHE
+unsigned long dcache_invld_count[NR_CPUS];
unsigned long barrier_mask __attribute__ ((__section__(".l2.bss")));
void resync_core_dcache(void)
{
unsigned int cpu = get_cpu();
blackfin_invalidate_entire_dcache();
- ++per_cpu(cpu_data, cpu).dcache_invld_count;
+ dcache_invld_count[cpu]++;
put_cpu();
}
EXPORT_SYMBOL(resync_core_dcache);
#endif
+
+#ifdef CONFIG_HOTPLUG_CPU
+int __cpuexit __cpu_disable(void)
+{
+ unsigned int cpu = smp_processor_id();
+
+ if (cpu == 0)
+ return -EPERM;
+
+ set_cpu_online(cpu, false);
+ return 0;
+}
+
+static DECLARE_COMPLETION(cpu_killed);
+
+int __cpuexit __cpu_die(unsigned int cpu)
+{
+ return wait_for_completion_timeout(&cpu_killed, 5000);
+}
+
+void cpu_die(void)
+{
+ complete(&cpu_killed);
+
+ atomic_dec(&init_mm.mm_users);
+ atomic_dec(&init_mm.mm_count);
+
+ local_irq_disable();
+ platform_cpu_die();
+}
+#endif