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smp: bf561: and smb_wmb()/smp_rmb() at ipi send/receive 

add smb_wmb()/smp_rmb() to keep cache coherent

Signed-off-by: Steven Miao <realmz6@gmail.com>
This commit is contained in:
Steven Miao 2013-11-15 15:41:35 +08:00
parent aefefe9211
commit 177a48fdc8
1 changed files with 8 additions and 4 deletions
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12
arch/blackfin/mach-common/smp.c
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@ -146,6 +146,7 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
platform_clear_ipi(cpu, IRQ_SUPPLE_1); platform_clear_ipi(cpu, IRQ_SUPPLE_1);
smp_rmb();
bfin_ipi_data = &__get_cpu_var(bfin_ipi); bfin_ipi_data = &__get_cpu_var(bfin_ipi);
while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) { while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) {
msg = 0; msg = 0;
@ -161,18 +162,20 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
case BFIN_IPI_CALL_FUNC: case BFIN_IPI_CALL_FUNC:
generic_smp_call_function_interrupt(); generic_smp_call_function_interrupt();
break; break;
case BFIN_IPI_CALL_FUNC_SINGLE: case BFIN_IPI_CALL_FUNC_SINGLE:
generic_smp_call_function_single_interrupt(); generic_smp_call_function_single_interrupt();
break; break;
case BFIN_IPI_CPU_STOP: case BFIN_IPI_CPU_STOP:
ipi_cpu_stop(cpu); ipi_cpu_stop(cpu);
break; break;
default:
goto out;
} }
atomic_dec(&bfin_ipi_data->count); atomic_dec(&bfin_ipi_data->count);
} while (msg < BITS_PER_LONG); } while (msg < BITS_PER_LONG);
} }
out:
return IRQ_HANDLED; return IRQ_HANDLED;
} }
@ -198,10 +201,11 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
bfin_ipi_data = &per_cpu(bfin_ipi, cpu); bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
atomic_set_mask((1 << msg), &bfin_ipi_data->bits); atomic_set_mask((1 << msg), &bfin_ipi_data->bits);
atomic_inc(&bfin_ipi_data->count); atomic_inc(&bfin_ipi_data->count);
platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
} }
local_irq_restore(flags); local_irq_restore(flags);
smp_wmb();
for_each_cpu(cpu, cpumask)
platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
} }
void arch_send_call_function_single_ipi(int cpu) void arch_send_call_function_single_ipi(int cpu)