[PATCH RFC XEN v1 01/14] xen: arm: Add gic_hw_desc

[Ian Campbell <ian.campbell@citrix.com>]

Because the enum gic_version values do not correspond to the gic
version (in order to allow space for variants such as GICv2m, although
that is currently not present) logging the raw value is not terribly
useful. Provide gic_hw_desc which provides a string describing each
GIC version.

Will be used in a later patch.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
 xen/arch/arm/gic.c        | 14 ++++++++++++++
 xen/include/asm-arm/gic.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 1e1e5ba..bea39d6 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -62,6 +62,20 @@ enum gic_version gic_hw_version(void)
    return gic_hw_ops->info->hw_version;
 }
 
+const char *gic_hw_desc(enum gic_version v)
+{
+    switch (v) {
+    case GIC_V2: return "GIC v2";
+    case GIC_V3: return "GIC v3";
+    }
+
+    /*
+     * The compiler ought to gripe if the above doesn't cover all enum
+     * gic_version, in case some version doesn't.
+     */
+    return "Unknown";
+}
+
 unsigned int gic_number_lines(void)
 {
     return gic_hw_ops->info->nr_lines;
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 42a2eec..818384b 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -221,6 +221,7 @@ enum gic_version {
 };
 
 extern enum gic_version gic_hw_version(void);
+extern const char *gic_hw_desc(enum gic_version v);
 
 /* Program the GIC to route an interrupt */
 extern void gic_route_irq_to_xen(struct irq_desc *desc, const cpumask_t *cpu_mask,
-- 
2.6.1