Implement lib counter

[lttng-modules.git] / include / counter / counter-types.h

diff --git a/include/counter/counter-types.h b/include/counter/counter-types.h
new file mode 100644 (file)
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--- /dev/null
+++ b/include/counter/counter-types.h
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+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * counter/counter-types.h
+ *
+ * LTTng Counters Types
+ *
+ * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_COUNTER_TYPES_H
+#define _LTTNG_COUNTER_TYPES_H
+
+#include <linux/types.h>
+#include <linux/percpu.h>
+#include <counter/config.h>
+
+struct lib_counter_dimension {
+       /*
+        * Max. number of indexable elements.
+        */
+       size_t max_nr_elem;
+       /*
+        * The stride for a dimension is the multiplication factor which
+        * should be applied to its index to take into account other
+        * dimensions nested inside.
+        */
+       size_t stride;
+};
+
+struct lib_counter_layout {
+       void *counters;
+       unsigned long *underflow_bitmap;
+       unsigned long *overflow_bitmap;
+};
+
+enum lib_counter_arithmetic {
+       LIB_COUNTER_ARITHMETIC_MODULAR,
+       LIB_COUNTER_ARITHMETIC_SATURATE,
+};
+
+struct lib_counter {
+       size_t nr_dimensions;
+       int64_t allocated_elem;
+       struct lib_counter_dimension *dimensions;
+       enum lib_counter_arithmetic arithmetic;
+       union {
+               struct {
+                       int32_t max, min;
+               } limits_32_bit;
+               struct {
+                       int64_t max, min;
+               } limits_64_bit;
+       } saturation;
+       union {
+               int8_t s8;
+               int16_t s16;
+               int32_t s32;
+               int64_t s64;
+       } global_sum_step;              /* 0 if unused */
+       struct lib_counter_config config;
+
+       struct lib_counter_layout global_counters;
+       struct lib_counter_layout __percpu *percpu_counters;
+};
+
+#endif /* _LTTNG_COUNTER_TYPES_H */