openwrt/target/linux/ramips/patches-3.10/0205-MIPS-GIC-Send-IPIs-using-the-GIC.patch

From 5a43b20db2fd18f8ea5f3a919d4bc9d9c2038c6c Mon Sep 17 00:00:00 2001
From: "Steven J. Hill" <Steven.Hill@imgtec.com>
Date: Wed, 25 Sep 2013 14:58:19 -0500
Subject: [PATCH 205/215] MIPS: GIC: Send IPIs using the GIC.

If a GIC present, then use it to send IPIs between the cores.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
---
 arch/mips/kernel/smp-mt.c |   32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

--- a/arch/mips/kernel/smp-mt.c
+++ b/arch/mips/kernel/smp-mt.c
@@ -71,6 +71,7 @@ static unsigned int __init smvp_vpe_init
 
 		/* Record this as available CPU */
 		set_cpu_possible(tc, true);
+		set_cpu_present(tc, true);
 		__cpu_number_map[tc]	= ++ncpu;
 		__cpu_logical_map[ncpu] = tc;
 	}
@@ -112,12 +113,35 @@ static void __init smvp_tc_init(unsigned
 	write_tc_c0_tchalt(TCHALT_H);
 }
 
+static void mp_send_ipi_single(int cpu, unsigned int action)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	switch (action) {
+	case SMP_CALL_FUNCTION:
+		gic_send_ipi(plat_ipi_call_int_xlate(cpu));
+		break;
+
+	case SMP_RESCHEDULE_YOURSELF:
+		gic_send_ipi(plat_ipi_resched_int_xlate(cpu));
+		break;
+	}
+
+	local_irq_restore(flags);
+}
+
 static void vsmp_send_ipi_single(int cpu, unsigned int action)
 {
 	int i;
 	unsigned long flags;
 	int vpflags;
 
+	if (gic_present) {
+		mp_send_ipi_single(cpu, action);
+		return;
+	}
 	local_irq_save(flags);
 
 	vpflags = dvpe();	/* can't access the other CPU's registers whilst MVPE enabled */
@@ -164,6 +188,8 @@ static void __cpuinit vsmp_init_secondar
 
 static void __cpuinit vsmp_smp_finish(void)
 {
+	pr_debug("SMPMT: CPU%d: vsmp_smp_finish\n", smp_processor_id());
+
 	/* CDFIXME: remove this? */
 	write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
 
@@ -178,6 +204,7 @@ static void __cpuinit vsmp_smp_finish(vo
 
 static void vsmp_cpus_done(void)
 {
+	pr_debug("SMPMT: CPU%d: vsmp_cpus_done\n", smp_processor_id());
 }
 
 /*
@@ -191,6 +218,8 @@ static void vsmp_cpus_done(void)
 static void __cpuinit vsmp_boot_secondary(int cpu, struct task_struct *idle)
 {
 	struct thread_info *gp = task_thread_info(idle);
+	pr_debug("SMPMT: CPU%d: vsmp_boot_secondary cpu %d\n",
+		smp_processor_id(), cpu);
 	dvpe();
 	set_c0_mvpcontrol(MVPCONTROL_VPC);
 
@@ -232,6 +261,7 @@ static void __init vsmp_smp_setup(void)
 	unsigned int mvpconf0, ntc, tc, ncpu = 0;
 	unsigned int nvpe;
 
+	pr_debug("SMPMT: CPU%d: vsmp_smp_setup\n", smp_processor_id());
 #ifdef CONFIG_MIPS_MT_FPAFF
 	/* If we have an FPU, enroll ourselves in the FPU-full mask */
 	if (cpu_has_fpu)
@@ -272,6 +302,8 @@ static void __init vsmp_smp_setup(void)
 
 static void __init vsmp_prepare_cpus(unsigned int max_cpus)
 {
+	pr_debug("SMPMT: CPU%d: vsmp_prepare_cpus %d\n",
+		smp_processor_id(), max_cpus);
 	mips_mt_set_cpuoptions();
 }