linux-kernel - [PATCH v2 1/3] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain

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Message-Id: <20200518091441.94843-2-anup.patel@wdc.com>
Date:   Mon, 18 May 2020 14:44:39 +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>, stable@...r.kernel.org
Subject: [PATCH v2 1/3] 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().

Fixes: f1ad1133b18f ("irqchip/sifive-plic: Add support for multiple PLICs")
Cc: stable@...r.kernel.org
Signed-off-by: Anup Patel <anup.patel@....com>
---
 drivers/irqchip/irq-sifive-plic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 822e074c0600..9f7f8ce88c00 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -176,9 +176,12 @@ static struct irq_chip plic_chip = {
 static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq,
 			      irq_hw_number_t hwirq)
 {
+	struct plic_priv *priv = d->host_data;
+
 	irq_domain_set_info(d, irq, hwirq, &plic_chip, d->host_data,
 			    handle_fasteoi_irq, NULL, NULL);
 	irq_set_noprobe(irq);
+	irq_set_affinity(irq, &priv->lmask);
 	return 0;
 }
 
-- 
2.25.1