linux-kernel - [PATCH v7 02/12] irqchip/mips-gic: Support multi-cluster in for_each_online_cpu

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Message-Id: <20241019071037.145314-3-arikalo@gmail.com>
Date: Sat, 19 Oct 2024 09:10:27 +0200
From: Aleksandar Rikalo <arikalo@...il.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Aleksandar Rikalo <arikalo@...il.com>,
	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>,
	Gregory CLEMENT <gregory.clement@...tlin.com>
Subject: [PATCH v7 02/12] irqchip/mips-gic: Support multi-cluster in for_each_online_cpu_gic()

From: Paul Burton <paulburton@...nel.org>

Use CM's GCR_CL_REDIRECT register to access registers in remote clusters,
so users of gic_with_each_online_cpu() gain support for multi-cluster with
no further changes.

Signed-off-by: Paul Burton <paulburton@...nel.org>
Signed-off-by: Chao-ying Fu <cfu@...ecomp.com>
Signed-off-by: Dragan Mladjenovic <dragan.mladjenovic@...mia.com>
Signed-off-by: Aleksandar Rikalo <arikalo@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Serge Semin <fancer.lancer@...il.com>
---
 drivers/irqchip/irq-mips-gic.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 6c7a7d2f0438..29bdfdce2123 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -88,6 +88,12 @@ static int __gic_with_next_online_cpu(int prev)
 	return cpu;
 }
 
+static inline void gic_unlock_cluster(void)
+{
+	if (mips_cps_multicluster_cpus())
+		mips_cm_unlock_other();
+}
+
 /**
  * for_each_online_cpu_gic() - Iterate over online CPUs, access local registers
  * @cpu: An integer variable to hold the current CPU number
@@ -102,6 +108,7 @@ static int __gic_with_next_online_cpu(int prev)
 	guard(raw_spinlock_irqsave)(gic_lock);		\
 	for ((cpu) = __gic_with_next_online_cpu(-1);	\
 	     (cpu) < nr_cpu_ids;			\
+	     gic_unlock_cluster(),			\
 	     (cpu) = __gic_with_next_online_cpu(cpu))
 
 static void gic_clear_pcpu_masks(unsigned int intr)
-- 
2.25.1