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Subject[irqchip: irq/irqchip-next] irqchip/apple-aic: Parse FIQ affinities from device-tree
The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID: a5e8801202b318622ea526aa5625e5f7eceb4d26
Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/a5e8801202b318622ea526aa5625e5f7eceb4d26
Author: Marc Zyngier <maz@kernel.org>
AuthorDate: Wed, 03 Nov 2021 13:35:25
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Mon, 07 Feb 2022 16:00:42

irqchip/apple-aic: Parse FIQ affinities from device-tree

In order to be able to tell the core IRQ code about the affinity
of the PMU interrupt in later patches, parse the affinities kindly
provided in the device-tree.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/irqchip/irq-apple-aic.c | 49 ++++++++++++++++++++++++++++++++-
1 file changed, 49 insertions(+)

diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c
index 38091eb..22d9b20 100644
--- a/drivers/irqchip/irq-apple-aic.c
+++ b/drivers/irqchip/irq-apple-aic.c
@@ -177,6 +177,9 @@ struct aic_irq_chip {
void __iomem *base;
struct irq_domain *hw_domain;
struct irq_domain *ipi_domain;
+ struct {
+ cpumask_t aff;
+ } *fiq_aff[AIC_NR_FIQ];
int nr_hw;
};

@@ -793,12 +796,50 @@ static struct gic_kvm_info vgic_info __initdata = {
.no_hw_deactivation = true,
};

+static void build_fiq_affinity(struct aic_irq_chip *ic, struct device_node *aff)
+{
+ int i, n;
+ u32 fiq;
+
+ if (of_property_read_u32(aff, "apple,fiq-index", &fiq) ||
+ WARN_ON(fiq >= AIC_NR_FIQ) || ic->fiq_aff[fiq])
+ return;
+
+ n = of_property_count_elems_of_size(aff, "cpus", sizeof(u32));
+ if (WARN_ON(n < 0))
+ return;
+
+ ic->fiq_aff[fiq] = kzalloc(sizeof(ic->fiq_aff[fiq]), GFP_KERNEL);
+ if (!ic->fiq_aff[fiq])
+ return;
+
+ for (i = 0; i < n; i++) {
+ struct device_node *cpu_node;
+ u32 cpu_phandle;
+ int cpu;
+
+ if (of_property_read_u32_index(aff, "cpus", i, &cpu_phandle))
+ continue;
+
+ cpu_node = of_find_node_by_phandle(cpu_phandle);
+ if (WARN_ON(!cpu_node))
+ continue;
+
+ cpu = of_cpu_node_to_id(cpu_node);
+ if (WARN_ON(cpu < 0))
+ continue;
+
+ cpumask_set_cpu(cpu, &ic->fiq_aff[fiq]->aff);
+ }
+}
+
static int __init aic_of_ic_init(struct device_node *node, struct device_node *parent)
{
int i;
void __iomem *regs;
u32 info;
struct aic_irq_chip *irqc;
+ struct device_node *affs;

regs = of_iomap(node, 0);
if (WARN_ON(!regs))
@@ -832,6 +873,14 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
return -ENODEV;
}

+ affs = of_get_child_by_name(node, "affinities");
+ if (affs) {
+ struct device_node *chld;
+
+ for_each_child_of_node(affs, chld)
+ build_fiq_affinity(irqc, chld);
+ }
+
set_handle_irq(aic_handle_irq);
set_handle_fiq(aic_handle_fiq);

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