Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / cpu_rmap.h

diff --git a/kernel/include/linux/cpu_rmap.h b/kernel/include/linux/cpu_rmap.h
new file mode 100644 (file)
index 0000000..bdd18ca
--- /dev/null
+++ b/kernel/include/linux/cpu_rmap.h
@@ -0,0 +1,69 @@
+#ifndef __LINUX_CPU_RMAP_H
+#define __LINUX_CPU_RMAP_H
+
+/*
+ * cpu_rmap.c: CPU affinity reverse-map support
+ * Copyright 2011 Solarflare Communications Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+
+#include <linux/cpumask.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/kref.h>
+
+/**
+ * struct cpu_rmap - CPU affinity reverse-map
+ * @refcount: kref for object
+ * @size: Number of objects to be reverse-mapped
+ * @used: Number of objects added
+ * @obj: Pointer to array of object pointers
+ * @near: For each CPU, the index and distance to the nearest object,
+ *      based on affinity masks
+ */
+struct cpu_rmap {
+       struct kref     refcount;
+       u16             size, used;
+       void            **obj;
+       struct {
+               u16     index;
+               u16     dist;
+       }               near[0];
+};
+#define CPU_RMAP_DIST_INF 0xffff
+
+extern struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags);
+extern int cpu_rmap_put(struct cpu_rmap *rmap);
+
+extern int cpu_rmap_add(struct cpu_rmap *rmap, void *obj);
+extern int cpu_rmap_update(struct cpu_rmap *rmap, u16 index,
+                          const struct cpumask *affinity);
+
+static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu)
+{
+       return rmap->near[cpu].index;
+}
+
+static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu)
+{
+       return rmap->obj[rmap->near[cpu].index];
+}
+
+/**
+ * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs
+ * @size: Number of objects to be mapped
+ *
+ * Must be called in process context.
+ */
+static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size)
+{
+       return alloc_cpu_rmap(size, GFP_KERNEL);
+}
+extern void free_irq_cpu_rmap(struct cpu_rmap *rmap);
+
+extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq);
+
+#endif /* __LINUX_CPU_RMAP_H */