linux-kernel - [PATCH 4/8] irqchip: mips-gic: Configure EIC when CPUs come online

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Date:   Wed, 25 Oct 2017 16:37:26 -0700
From:   Paul Burton <paul.burton@...s.com>
To:     Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>
CC:     <linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>,
        Paul Burton <paul.burton@...s.com>
Subject: [PATCH 4/8] irqchip: mips-gic: Configure EIC when CPUs come online

Rather than configuring EIC mode for all CPUs during boot, configure it
locally on each when they come online. This will become important with
multi-cluster support, since clusters may be powered on & off (for
example via hotplug) and would lose the EIC configuration when powered
off.

Signed-off-by: Paul Burton <paul.burton@...s.com>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-mips@...ux-mips.org
---

 drivers/irqchip/irq-mips-gic.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 2a31949d09ce..95daa96d8b52 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -655,6 +655,10 @@ static const struct irq_domain_ops gic_ipi_domain_ops = {
 
 static int gic_cpu_startup(unsigned int cpu)
 {
+	/* Enable or disable EIC */
+	change_gic_vl_ctl(GIC_VX_CTL_EIC,
+			  cpu_has_veic ? GIC_VX_CTL_EIC : 0);
+
 	/* Clear all local IRQ masks (ie. disable all local interrupts) */
 	write_gic_vl_rmask(~0);
 
@@ -667,7 +671,7 @@ static int gic_cpu_startup(unsigned int cpu)
 static int __init gic_of_init(struct device_node *node,
 			      struct device_node *parent)
 {
-	unsigned int cpu_vec, i, gicconfig, cpu, v[2];
+	unsigned int cpu_vec, i, gicconfig, v[2];
 	unsigned long reserved;
 	phys_addr_t gic_base;
 	struct resource res;
@@ -722,12 +726,6 @@ static int __init gic_of_init(struct device_node *node,
 	gic_vpes = gic_vpes + 1;
 
 	if (cpu_has_veic) {
-		/* Set EIC mode for all VPEs */
-		for_each_present_cpu(cpu) {
-			write_gic_vl_other(mips_cm_vp_id(cpu));
-			write_gic_vo_ctl(GIC_VX_CTL_EIC);
-		}
-
 		/* Always use vector 1 in EIC mode */
 		gic_cpu_pin = 0;
 		timer_cpu_pin = gic_cpu_pin;
-- 
2.14.3