linux-kernel - [PATCH v2 05/12] irqchip: mips-gic: Setup defaults in each cluster

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Date:   Wed, 25 May 2022 14:10:23 +0200
From:   Dragan Mladjenovic <Dragan.Mladjenovic@...mia.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Chao-ying Fu <cfu@...ecomp.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...nel.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        Paul Burton <paulburton@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Dragan Mladjenovic <dragan.mladjenovic@...mia.com>
Subject: [PATCH v2 05/12] irqchip: mips-gic: Setup defaults in each cluster

From: Chao-ying Fu <cfu@...ecomp.com>

In multi-cluster MIPS I6500 systems we have a GIC per cluster. The
default shared interrupt setup that we configure in gic_of_init() will
only apply to the GIC in the cluster containing the boot CPU, leaving
the GICs of other clusters unconfigured. Similarly configure other
clusters here.

Signed-off-by: Chao-ying Fu <cfu@...ecomp.com>
Signed-off-by: Dragan Mladjenovic <dragan.mladjenovic@...mia.com>

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 89a3c6d04e09..f692392666a2 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -741,7 +741,7 @@ 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, v[2], num_ipis;
+	unsigned int cpu_vec, i, gicconfig, v[2], num_ipis, cl, nclusters;
 	unsigned long reserved;
 	phys_addr_t gic_base;
 	struct resource res;
@@ -860,11 +860,30 @@ static int __init gic_of_init(struct device_node *node,
 
 	board_bind_eic_interrupt = &gic_bind_eic_interrupt;
 
-	/* Setup defaults */
-	for (i = 0; i < gic_shared_intrs; i++) {
-		change_gic_pol(i, GIC_POL_ACTIVE_HIGH);
-		change_gic_trig(i, GIC_TRIG_LEVEL);
-		write_gic_rmask(i);
+	/*
+	 * Initialise each cluster's GIC shared registers to sane default
+	 * values.
+	 * Otherwise, the IPI set up will be erased if we move code
+	 * to gic_cpu_startup for each cpu.
+	 */
+	nclusters = mips_cps_numclusters();
+	for (cl = 0; cl < nclusters; cl++) {
+		if (cl == cpu_cluster(&current_cpu_data)) {
+			for (i = 0; i < gic_shared_intrs; i++) {
+				change_gic_pol(i, GIC_POL_ACTIVE_HIGH);
+				change_gic_trig(i, GIC_TRIG_LEVEL);
+				write_gic_rmask(i);
+			}
+		} else {
+			mips_cm_lock_other(cl, 0, 0,
+					   CM_GCR_Cx_OTHER_BLOCK_GLOBAL);
+			for (i = 0; i < gic_shared_intrs; i++) {
+				change_gic_redir_pol(i, GIC_POL_ACTIVE_HIGH);
+				change_gic_redir_trig(i, GIC_TRIG_LEVEL);
+				write_gic_redir_rmask(i);
+			}
+			mips_cm_unlock_other();
+		}
 	}
 
 	return cpuhp_setup_state(CPUHP_AP_IRQ_MIPS_GIC_STARTING,
-- 
2.17.1