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ARCv2: MCIP: Use IDU_M_DISTRI_DEST mode if there is only 1 destination core

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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: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Yuriy Kolerov 2016-11-08 10:08:32 +03:00 committed by Vineet Gupta
parent 34e71e4cbb
commit 0a0a047def
1 changed files with 11 additions and 2 deletions
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13
arch/arc/kernel/mcip.c
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@ -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);