This is a note to let you know that I've just added the patch titled
irqchip: gic: Fix core ID calculation when topology is read from DT
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
irqchip-gic-fix-core-id-calculation-when-topology-is-read-from-dt.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 29e697b11853d3f83b1864ae385abdad4aa2c361 Mon Sep 17 00:00:00 2001
From: Tomasz Figa <t.figa@xxxxxxxxxxx>
Date: Thu, 17 Jul 2014 17:23:44 +0200
Subject: irqchip: gic: Fix core ID calculation when topology is read from DT
From: Tomasz Figa <t.figa@xxxxxxxxxxx>
commit 29e697b11853d3f83b1864ae385abdad4aa2c361 upstream.
Certain GIC implementation, namely those found on earlier, single
cluster, Exynos SoCs, have registers mapped without per-CPU banking,
which means that the driver needs to use different offset for each CPU.
Currently the driver calculates the offset by multiplying value returned
by cpu_logical_map() by CPU offset parsed from DT. This is correct when
CPU topology is not specified in DT and aforementioned function returns
core ID alone. However when DT contains CPU topology, the function
changes to return cluster ID as well, which is non-zero on mentioned
SoCs and so breaks the calculation in GIC driver.
This patch fixes this by masking out cluster ID in CPU offset
calculation so that only core ID is considered. Multi-cluster Exynos
SoCs already have banked GIC implementations, so this simple fix should
be enough.
Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
Fixes: db0d4db22a78d ("ARM: gic: allow GIC to support non-banked setups")
Link: https://lkml.kernel.org/r/1405610624-18722-1-git-send-email-t.figa@xxxxxxxxxxx
Signed-off-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-gic.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -42,6 +42,7 @@
#include <linux/irqchip/chained_irq.h>
#include <linux/irqchip/arm-gic.h>
+#include <asm/cputype.h>
#include <asm/irq.h>
#include <asm/exception.h>
#include <asm/smp_plat.h>
@@ -754,7 +755,9 @@ void __init gic_init_bases(unsigned int
}
for_each_possible_cpu(cpu) {
- unsigned long offset = percpu_offset * cpu_logical_map(cpu);
+ u32 mpidr = cpu_logical_map(cpu);
+ u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ unsigned long offset = percpu_offset * core_id;
*per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
*per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
}
Patches currently in stable-queue which might be from t.figa@xxxxxxxxxxx are
queue-3.10/irqchip-gic-fix-core-id-calculation-when-topology-is-read-from-dt.patch
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