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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/perf/util/branch.h
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@@ -1,8 +1,73 @@
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 #ifndef _PERF_BRANCH_H
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 #define _PERF_BRANCH_H 1
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-
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+/*
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+ * The linux/stddef.h isn't need here, but is needed for __always_inline used
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+ * in files included from uapi/linux/perf_event.h such as
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+ * /usr/include/linux/swab.h and /usr/include/linux/byteorder/little_endian.h,
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+ * detected in at least musl libc, used in Alpine Linux. -acme
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+ */
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+#include <stdio.h>
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 #include <stdint.h>
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-#include "../perf.h"
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+#include <linux/compiler.h>
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+#include <linux/stddef.h>
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+#include <linux/perf_event.h>
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+#include <linux/types.h>
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+#include "event.h"
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+
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+struct branch_flags {
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+	union {
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+		u64 value;
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+		struct {
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+			u64 mispred:1;
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+			u64 predicted:1;
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+			u64 in_tx:1;
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+			u64 abort:1;
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+			u64 cycles:16;
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+			u64 type:4;
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+			u64 reserved:40;
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+		};
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+	};
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+};
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+
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+struct branch_info {
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+	struct addr_map_symbol from;
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+	struct addr_map_symbol to;
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+	struct branch_flags    flags;
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+	char		       *srcline_from;
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+	char		       *srcline_to;
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+};
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+
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+struct branch_entry {
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+	u64			from;
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+	u64			to;
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+	struct branch_flags	flags;
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+};
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+
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+struct branch_stack {
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+	u64			nr;
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+	u64			hw_idx;
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+	struct branch_entry	entries[];
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+};
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+
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+/*
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+ * The hw_idx is only available when PERF_SAMPLE_BRANCH_HW_INDEX is applied.
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+ * Otherwise, the output format of a sample with branch stack is
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+ * struct branch_stack {
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+ *	u64			nr;
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+ *	struct branch_entry	entries[0];
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+ * }
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+ * Check whether the hw_idx is available,
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+ * and return the corresponding pointer of entries[0].
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+ */
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+static inline struct branch_entry *perf_sample__branch_entries(struct perf_sample *sample)
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+{
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+	u64 *entry = (u64 *)sample->branch_stack;
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+
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+	entry++;
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+	if (sample->no_hw_idx)
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+		return (struct branch_entry *)entry;
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+	return (struct branch_entry *)(++entry);
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+}
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 struct branch_type_stat {
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 	bool	branch_to;
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@@ -12,8 +77,6 @@
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 	u64	cross_4k;
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 	u64	cross_2m;
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 };
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-
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-struct branch_flags;
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 void branch_type_count(struct branch_type_stat *st, struct branch_flags *flags,
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 		       u64 from, u64 to);