[Xen-devel] [RFC PATCH 12/49] ARM: VGIC: introduce gic_get_nr_lrs()

[Andre Przywara <andre.przywara@xxxxxxxxxx>]

So far the number of list registers (LRs) a GIC implements is only
needed in the hardware facing side of the VGIC code (gic-vgic.c).
The new VGIC will need this information in more and multiple places, so
export a function that returns the number.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>
---
 xen/arch/arm/gic-vgic.c   | 10 +++++-----
 xen/arch/arm/gic.c        |  5 +++++
 xen/include/asm-arm/gic.h |  1 +
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/xen/arch/arm/gic-vgic.c b/xen/arch/arm/gic-vgic.c
index d273863556..c92626e4ee 100644
--- a/xen/arch/arm/gic-vgic.c
+++ b/xen/arch/arm/gic-vgic.c
@@ -25,7 +25,7 @@
 #include <asm/gic.h>
 #include <asm/vgic.h>
 
-#define lr_all_full() (this_cpu(lr_mask) == ((1 << gic_hw_ops->info->nr_lrs) - 
1))
+#define lr_all_full() (this_cpu(lr_mask) == ((1 << gic_get_nr_lrs()) - 1))
 
 #undef GIC_DEBUG
 
@@ -110,7 +110,7 @@ static unsigned int gic_find_unused_lr(struct vcpu *v,
                                        struct pending_irq *p,
                                        unsigned int lr)
 {
-    unsigned int nr_lrs = gic_hw_ops->info->nr_lrs;
+    unsigned int nr_lrs = gic_get_nr_lrs();
     unsigned long *lr_mask = (unsigned long *) &this_cpu(lr_mask);
     struct gic_lr lr_val;
 
@@ -137,7 +137,7 @@ void gic_raise_guest_irq(struct vcpu *v, unsigned int 
virtual_irq,
         unsigned int priority)
 {
     int i;
-    unsigned int nr_lrs = gic_hw_ops->info->nr_lrs;
+    unsigned int nr_lrs = gic_get_nr_lrs();
     struct pending_irq *p = irq_to_pending(v, virtual_irq);
 
     ASSERT(spin_is_locked(&v->arch.vgic.lock));
@@ -251,7 +251,7 @@ void gic_clear_lrs(struct vcpu *v)
 {
     int i = 0;
     unsigned long flags;
-    unsigned int nr_lrs = gic_hw_ops->info->nr_lrs;
+    unsigned int nr_lrs = gic_get_nr_lrs();
 
     /* The idle domain has no LRs to be cleared. Since gic_restore_state
      * doesn't write any LR registers for the idle domain they could be
@@ -278,7 +278,7 @@ static void gic_restore_pending_irqs(struct vcpu *v)
     struct pending_irq *p, *t, *p_r;
     struct list_head *inflight_r;
     unsigned long flags;
-    unsigned int nr_lrs = gic_hw_ops->info->nr_lrs;
+    unsigned int nr_lrs = gic_get_nr_lrs();
     int lrs = nr_lrs;
 
     spin_lock_irqsave(&v->arch.vgic.lock, flags);
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 968e46fabb..89873c1df4 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -47,6 +47,11 @@ void register_gic_ops(const struct gic_hw_operations *ops)
     gic_hw_ops = ops;
 }
 
+int gic_get_nr_lrs(void)
+{
+    return gic_hw_ops->info->nr_lrs;
+}
+
 static void clear_cpu_lr_mask(void)
 {
     this_cpu(lr_mask) = 0ULL;
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 1d382b0ade..c1f027d703 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -222,6 +222,7 @@ enum gic_version {
 DECLARE_PER_CPU(uint64_t, lr_mask);
 
 extern enum gic_version gic_hw_version(void);
+extern int gic_get_nr_lrs(void);
 
 /* Program the IRQ type into the GIC */
 void gic_set_irq_type(struct irq_desc *desc, unsigned int type);
-- 
2.14.1


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