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")
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200518091441.94843-2-anup.patel@wdc.com

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 822e074c06007a77f5313ba5cc7465054d7d94ee..9f7f8ce88c0026d0ba83743320bd16b39a2afb76 100644 (file)
--- 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;
 }