Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/include/linux/cacheinfo.h b/kernel/include/linux/cacheinfo.h
new file mode 100644 (file)
index 0000000..3daf5ed
--- /dev/null
+++ b/kernel/include/linux/cacheinfo.h
@@ -0,0 +1,100 @@
+#ifndef _LINUX_CACHEINFO_H
+#define _LINUX_CACHEINFO_H
+
+#include <linux/bitops.h>
+#include <linux/cpumask.h>
+#include <linux/smp.h>
+
+struct device_node;
+struct attribute;
+
+enum cache_type {
+       CACHE_TYPE_NOCACHE = 0,
+       CACHE_TYPE_INST = BIT(0),
+       CACHE_TYPE_DATA = BIT(1),
+       CACHE_TYPE_SEPARATE = CACHE_TYPE_INST | CACHE_TYPE_DATA,
+       CACHE_TYPE_UNIFIED = BIT(2),
+};
+
+/**
+ * struct cacheinfo - represent a cache leaf node
+ * @type: type of the cache - data, inst or unified
+ * @level: represents the hierarcy in the multi-level cache
+ * @coherency_line_size: size of each cache line usually representing
+ *     the minimum amount of data that gets transferred from memory
+ * @number_of_sets: total number of sets, a set is a collection of cache
+ *     lines sharing the same index
+ * @ways_of_associativity: number of ways in which a particular memory
+ *     block can be placed in the cache
+ * @physical_line_partition: number of physical cache lines sharing the
+ *     same cachetag
+ * @size: Total size of the cache
+ * @shared_cpu_map: logical cpumask representing all the cpus sharing
+ *     this cache node
+ * @attributes: bitfield representing various cache attributes
+ * @of_node: if devicetree is used, this represents either the cpu node in
+ *     case there's no explicit cache node or the cache node itself in the
+ *     device tree
+ * @disable_sysfs: indicates whether this node is visible to the user via
+ *     sysfs or not
+ * @priv: pointer to any private data structure specific to particular
+ *     cache design
+ *
+ * While @of_node, @disable_sysfs and @priv are used for internal book
+ * keeping, the remaining members form the core properties of the cache
+ */
+struct cacheinfo {
+       enum cache_type type;
+       unsigned int level;
+       unsigned int coherency_line_size;
+       unsigned int number_of_sets;
+       unsigned int ways_of_associativity;
+       unsigned int physical_line_partition;
+       unsigned int size;
+       cpumask_t shared_cpu_map;
+       unsigned int attributes;
+#define CACHE_WRITE_THROUGH    BIT(0)
+#define CACHE_WRITE_BACK       BIT(1)
+#define CACHE_WRITE_POLICY_MASK                \
+       (CACHE_WRITE_THROUGH | CACHE_WRITE_BACK)
+#define CACHE_READ_ALLOCATE    BIT(2)
+#define CACHE_WRITE_ALLOCATE   BIT(3)
+#define CACHE_ALLOCATE_POLICY_MASK     \
+       (CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE)
+
+       struct device_node *of_node;
+       bool disable_sysfs;
+       void *priv;
+};
+
+struct cpu_cacheinfo {
+       struct cacheinfo *info_list;
+       unsigned int num_levels;
+       unsigned int num_leaves;
+};
+
+/*
+ * Helpers to make sure "func" is executed on the cpu whose cache
+ * attributes are being detected
+ */
+#define DEFINE_SMP_CALL_CACHE_FUNCTION(func)                   \
+static inline void _##func(void *ret)                          \
+{                                                              \
+       int cpu = smp_processor_id();                           \
+       *(int *)ret = __##func(cpu);                            \
+}                                                              \
+                                                               \
+int func(unsigned int cpu)                                     \
+{                                                              \
+       int ret;                                                \
+       smp_call_function_single(cpu, _##func, &ret, true);     \
+       return ret;                                             \
+}
+
+struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
+int init_cache_level(unsigned int cpu);
+int populate_cache_leaves(unsigned int cpu);
+
+const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
+
+#endif /* _LINUX_CACHEINFO_H */