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Commit 0a0a047d authored by Yuriy Kolerov's avatar Yuriy Kolerov Committed by Vineet Gupta
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ARCv2: MCIP: Use IDU_M_DISTRI_DEST mode if there is only 1 destination core 



ARC linux uses 2 distribution modes for common interrupts: round robin
mode (IDU_M_DISTRI_RR) and a simple destination mode (IDU_M_DISTRI_DEST).
The first one is used when more than 1 cores may handle a common interrupt
and the second one is used when only 1 core may handle a common interrupt.

However idu_irq_set_affinity() always sets IDU_M_DISTRI_RR for all affinity
values. But there is no sense in setting of such mode if only 1 core must
handle a common interrupt.

Signed-off-by: default avatarYuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 34e71e4c

arch/arc/kernel/mcip.c

+11 −2
Original line number Diff line number Diff line
@@ -181,6 +181,8 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask, 
{

	unsigned long flags;

	cpumask_t online;

	unsigned int destination_bits;

	unsigned int distribution_mode;



	/* errout if no online cpu per @cpumask */

	if (!cpumask_and(&online, cpumask, cpu_online_mask))
@@ -188,8 +190,15 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask, 


	raw_spin_lock_irqsave(&mcip_lock, flags);



	idu_set_dest(data->hwirq, cpumask_bits(&online)[0]);

	idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, IDU_M_DISTRI_RR);

	destination_bits = cpumask_bits(&online)[0];

	idu_set_dest(data->hwirq, destination_bits);



	if (ffs(destination_bits) == fls(destination_bits))

		distribution_mode = IDU_M_DISTRI_DEST;

	else

		distribution_mode = IDU_M_DISTRI_RR;



	idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, distribution_mode);



	raw_spin_unlock_irqrestore(&mcip_lock, flags);