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authorNicolas Pitre <nicolas.pitre@linaro.org>2012-11-27 21:54:41 -0500
committerNicolas Pitre <nicolas.pitre@linaro.org>2013-06-20 00:23:49 -0400
commit917c352f7ba7753449aa670b49748068f6629cd1 (patch)
treec94cb7039d9747c26d41e3802681e88fa3bae0c1 /arch/arm/kernel
parent1c332d4f223066932035578f22877d269443394e (diff)
downloadvexpress-lsk-917c352f7ba7753449aa670b49748068f6629cd1.tar.gz
ARM: SMP: basic IPI triggered completion support
We need a mechanism to let an inbound CPU signal that it is alive before even getting into the kernel environment i.e. from early assembly code. Using an IPI is the simplest way to achieve that. This adds some basic infrastructure to register a struct completion pointer to be "completed" when the dedicated IPI for this task is received. Signed-off-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/smp.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 550d63cef68..c8ec8955eec 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -66,6 +66,7 @@ enum ipi_msg_type {
IPI_CALL_FUNC,
IPI_CALL_FUNC_SINGLE,
IPI_CPU_STOP,
+ IPI_COMPLETION,
};
static DECLARE_COMPLETION(cpu_running);
@@ -463,6 +464,7 @@ static const char *ipi_types[NR_IPI] = {
S(IPI_CALL_FUNC, "Function call interrupts"),
S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
S(IPI_CPU_STOP, "CPU stop interrupts"),
+ S(IPI_COMPLETION, "completion interrupts"),
};
void show_ipi_list(struct seq_file *p, int prec)
@@ -588,6 +590,19 @@ static void ipi_cpu_stop(unsigned int cpu)
cpu_relax();
}
+static DEFINE_PER_CPU(struct completion *, cpu_completion);
+
+int register_ipi_completion(struct completion *completion, int cpu)
+{
+ per_cpu(cpu_completion, cpu) = completion;
+ return IPI_COMPLETION;
+}
+
+static void ipi_complete(unsigned int cpu)
+{
+ complete(per_cpu(cpu_completion, cpu));
+}
+
/*
* Main handler for inter-processor interrupts
*/
@@ -638,6 +653,12 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
irq_exit();
break;
+ case IPI_COMPLETION:
+ irq_enter();
+ ipi_complete(cpu);
+ irq_exit();
+ break;
+
default:
printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
cpu, ipinr);