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authorNicolas Pitre <nicolas.pitre@linaro.org>2012-11-28 18:48:19 -0500
committerNicolas Pitre <nicolas.pitre@linaro.org>2013-06-19 16:54:28 -0400
commit1c332d4f223066932035578f22877d269443394e (patch)
treebede9700788e32f260ba2066b326bcdd09241348
parentdf321c43e3c3ed44d2434fd12d378736a82152d5 (diff)
downloadvexpress-lsk-1c332d4f223066932035578f22877d269443394e.tar.gz
ARM: GIC: interface to send a SGI directly
The regular gic_raise_softirq() takes as input a CPU mask which is not adequate when we need to send an IPI to a CPU which is not represented in the kernel to GIC mapping. That is the case with the b.L switcher when GIC migration to the inbound CPU has not yet occurred. Signed-off-by: Nicolas Pitre <nico@linaro.org>
-rw-r--r--drivers/irqchip/irq-gic.c14
-rw-r--r--include/linux/irqchip/arm-gic.h1
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 8389e381f7c..6b01aa00832 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -668,6 +668,20 @@ void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
#ifdef CONFIG_BL_SWITCHER
/*
+ * gic_send_sgi - send a SGI directly to given CPU interface number
+ *
+ * cpu_id: the ID for the destination CPU interface
+ * irq: the IPI number to send a SGI for
+ */
+void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
+{
+ BUG_ON(cpu_id >= NR_GIC_CPU_IF);
+ cpu_id = 1 << cpu_id;
+ /* this always happens on GIC0 */
+ writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
+}
+
+/*
* gic_get_cpu_id - get the CPU interface ID for the specified CPU
*
* @cpu: the logical CPU number to get the GIC ID for.
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index 8de992f6eae..666afc3ca53 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -75,6 +75,7 @@ static inline void gic_init(unsigned int nr, int start,
gic_init_bases(nr, start, dist, cpu, 0, NULL);
}
+void gic_send_sgi(unsigned int cpu_id, unsigned int irq);
int gic_get_cpu_id(unsigned int cpu);
void gic_migrate_target(unsigned int new_cpu_id);
unsigned long gic_get_sgir_physaddr(void);