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authorYuriy Kolerov <yuriy.kolerov@synopsys.com>2016-11-08 10:08:32 +0300
committerVineet Gupta <vgupta@synopsys.com>2016-11-08 12:22:52 -0800
commit0a0a047def15b7c8bcd27671d2be2de3d37fb30d (patch)
tree92b2417272fcb6360e72f9904ba03d04fb5a8fb0 /arch
parent34e71e4cbb8eb467dbcfb3afbd2b95ff2b08f482 (diff)
downloadlinux-0a0a047def15b7c8bcd27671d2be2de3d37fb30d.tar.bz2
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: Yuriy Kolerov <yuriy.kolerov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arc/kernel/mcip.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arc/kernel/mcip.c b/arch/arc/kernel/mcip.c
index 6d18bb871926..f39142acc89e 100644
--- a/arch/arc/kernel/mcip.c
+++ b/arch/arc/kernel/mcip.c
@@ -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);