linux-kernel - [PATCH 4/4] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain

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Message-Id: <20200516063901.18365-5-anup.patel@wdc.com>
Date:   Sat, 16 May 2020 12:09:01 +0530
From:   Anup Patel <anup.patel@....com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Cc:     Atish Patra <atish.patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anup Patel <anup.patel@....com>
Subject: [PATCH 4/4] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain_map()

For multiple PLIC instances, each PLIC can only target a subset of
CPUs which is represented by "lmask" in the "struct plic_priv".

Currently, the default irq affinity for each PLIC interrupt is all
online CPUs which is illegal value for default irq affinity when we
have multiple PLIC instances. To fix this, we now set "lmask" as the
default irq affinity in for each interrupt in plic_irqdomain_map().

Signed-off-by: Anup Patel <anup.patel@....com>
---
 drivers/irqchip/irq-sifive-plic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index e42fc082ad18..9af5e2fd2574 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -174,6 +174,7 @@ static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq,
 	irq_domain_set_info(d, irq, hwirq, &priv->chip, d->host_data,
 			    handle_fasteoi_irq, NULL, NULL);
 	irq_set_noprobe(irq);
+	irq_set_affinity(irq, &priv->lmask);
 	return 0;
 }
 
-- 
2.25.1