[Xen-devel] [RFC PATCH v2 12/22] xen/arm: its: Update irq descriptor for LPIs support

[vijay.kilari@xxxxxxxxx]

From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>

Introduce new fields in arch_irq_desc for to hold
virtual irq number and pointer to its device.
Also introduced helper function to read and update
device pointer in arch_irq_desc

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
---
 xen/arch/arm/irq.c        |   26 ++++++++++++++++++++++++++
 xen/include/asm-arm/irq.h |    4 ++++
 2 files changed, 30 insertions(+)

diff --git a/xen/arch/arm/irq.c b/xen/arch/arm/irq.c
index cb9c99b..d02f4cf 100644
--- a/xen/arch/arm/irq.c
+++ b/xen/arch/arm/irq.c
@@ -89,6 +89,8 @@ static int __cpuinit init_local_irq_data(void)
         init_one_irq_desc(desc);
         desc->irq = irq;
         desc->action  = NULL;
+        desc->arch.dev = NULL;
+        desc->arch.virq = 0;
 
         /* PPIs are included in local_irqs, we copy the IRQ type from
          * local_irqs_type when bringing up local IRQ for this CPU in
@@ -104,6 +106,30 @@ static int __cpuinit init_local_irq_data(void)
     return 0;
 }
 
+int irq_set_desc_data(unsigned int irq, struct its_device *d)
+{
+    unsigned long flags;
+    struct irq_desc *desc = irq_to_desc(irq);
+
+    spin_lock_irqsave(&desc->lock, flags);
+    desc->arch.dev = d;
+    spin_unlock_irqrestore(&desc->lock, flags);
+
+    return 0;
+}
+
+struct its_device *irq_get_desc_data(struct irq_desc *desc)
+{
+    unsigned long flags;
+    struct its_device *dev;
+
+    spin_lock_irqsave(&desc->lock, flags);
+    dev = desc->arch.dev;
+    spin_unlock_irqrestore(&desc->lock, flags);
+
+    return dev;
+}
+
 void __init init_IRQ(void)
 {
     int irq;
diff --git a/xen/include/asm-arm/irq.h b/xen/include/asm-arm/irq.h
index 435dfcd..f091739 100644
--- a/xen/include/asm-arm/irq.h
+++ b/xen/include/asm-arm/irq.h
@@ -17,6 +17,8 @@ struct arch_pirq
 struct arch_irq_desc {
     int eoi_cpu;
     unsigned int type;
+    unsigned int virq;
+    struct its_device *dev;
 };
 
 #define NR_LOCAL_IRQS  32
@@ -47,6 +49,8 @@ void arch_move_irqs(struct vcpu *v);
 /* Set IRQ type for an SPI */
 int irq_set_spi_type(unsigned int spi, unsigned int type);
 
+int irq_set_desc_data(unsigned int irq, struct its_device *d);
+struct its_device *irq_get_desc_data(struct irq_desc *d);
 int platform_get_irq(const struct dt_device_node *device, int index);
 
 void irq_set_affinity(struct irq_desc *desc, const cpumask_t *cpu_mask);
-- 
1.7.9.5


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