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authorVineet Gupta <vgupta@synopsys.com>2013-11-25 12:59:03 +0530
committerVineet Gupta <vgupta@synopsys.com>2013-12-23 12:05:04 +0530
commitddf84433f411b612e935a6719ee395bb9dd2221f (patch)
treed9dab0c2b2b6aa73e1959149e21baf38031dc7ff /arch/arc
parent413541dd66d51f791a0b169d9b9014e4f56be13c (diff)
downloadop-kernel-dev-ddf84433f411b612e935a6719ee395bb9dd2221f.zip
op-kernel-dev-ddf84433f411b612e935a6719ee395bb9dd2221f.tar.gz
ARC: [SMP] cpumask not needed in IPI send path
The current IPI sending callstack needlessly involves cpumask. arch_send_call_function_single_ipi(cpu) / smp_send_reschedule(cpu) ipi_send_msg(cpumask_of(cpu)) --> [cpu to cpumask] plat_smp_ops.ipi_send(callmap) for_each_cpu(callmap) --> [cpuask to cpu] do_plat_specific_ipi_PER_CPU Given that current backends are not capable of 1:N IPIs, lets simplify the interface for now, by keeping "a" cpu all along. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/include/asm/smp.h4
-rw-r--r--arch/arc/kernel/smp.c23
-rw-r--r--arch/arc/plat-arcfpga/smp.c8
3 files changed, 18 insertions, 17 deletions
diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h
index eefc29f..9b40e3b 100644
--- a/arch/arc/include/asm/smp.h
+++ b/arch/arc/include/asm/smp.h
@@ -46,13 +46,13 @@ extern int smp_ipi_irq_setup(int cpu, int irq);
*
* @info: SoC SMP specific info for /proc/cpuinfo etc
* @cpu_kick: For Master to kickstart a cpu (optionally at a PC)
- * @ipi_send: To send IPI to a @cpumask
+ * @ipi_send: To send IPI to a @cpu
* @ips_clear: To clear IPI received by @cpu at @irq
*/
struct plat_smp_ops {
const char *info;
void (*cpu_kick)(int cpu, unsigned long pc);
- void (*ipi_send)(void *callmap);
+ void (*ipi_send)(int cpu);
void (*ipi_clear)(int cpu, int irq);
};
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index c2f9ebb..f2fdef9 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -220,28 +220,33 @@ struct ipi_data {
static DEFINE_PER_CPU(struct ipi_data, ipi_data);
-static void ipi_send_msg(const struct cpumask *callmap, enum ipi_msg_type msg)
+static void ipi_send_msg_one(int cpu, enum ipi_msg_type msg)
{
+ struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
unsigned long flags;
- unsigned int cpu;
local_irq_save(flags);
- for_each_cpu(cpu, callmap) {
- struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
- set_bit(msg, &ipi->bits);
- }
+ set_bit(msg, &ipi->bits);
/* Call the platform specific cross-CPU call function */
if (plat_smp_ops.ipi_send)
- plat_smp_ops.ipi_send((void *)callmap);
+ plat_smp_ops.ipi_send(cpu);
local_irq_restore(flags);
}
+static void ipi_send_msg(const struct cpumask *callmap, enum ipi_msg_type msg)
+{
+ unsigned int cpu;
+
+ for_each_cpu(cpu, callmap)
+ ipi_send_msg_one(cpu, msg);
+}
+
void smp_send_reschedule(int cpu)
{
- ipi_send_msg(cpumask_of(cpu), IPI_RESCHEDULE);
+ ipi_send_msg_one(cpu, IPI_RESCHEDULE);
}
void smp_send_stop(void)
@@ -254,7 +259,7 @@ void smp_send_stop(void)
void arch_send_call_function_single_ipi(int cpu)
{
- ipi_send_msg(cpumask_of(cpu), IPI_CALL_FUNC);
+ ipi_send_msg_one(cpu, IPI_CALL_FUNC);
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
diff --git a/arch/arc/plat-arcfpga/smp.c b/arch/arc/plat-arcfpga/smp.c
index 91b5534..5e4fe95 100644
--- a/arch/arc/plat-arcfpga/smp.c
+++ b/arch/arc/plat-arcfpga/smp.c
@@ -88,13 +88,9 @@ void iss_model_init_smp(unsigned int cpu)
smp_ipi_irq_setup(cpu, IDU_INTERRUPT_0 + cpu);
}
-static void iss_model_ipi_send(void *arg)
+static void iss_model_ipi_send(int cpu)
{
- struct cpumask *callmap = arg;
- unsigned int cpu;
-
- for_each_cpu(cpu, callmap)
- idu_irq_assert(cpu);
+ idu_irq_assert(cpu);
}
static void iss_model_ipi_clear(int cpu, int irq)
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